HEATING SYSTEM
A heating system can include certain pressure sensitive features. These features can be configured to change from a first position to a second position based on a pressure of a fuel flowing into the feature. These features can include, fuel selector valves, pressure regulators, burner nozzles, and oxygen depletion sensor nozzles, among other features.
This application claims priority to U.S. Provisional Application Nos.: (1) 61/352,327, filed Jun. 7, 2010; (2) 61/352,329, filed Jun. 7, 2010; (3) 61/421,541, filed Dec. 9, 2010; and (4) 61/473,714, filed Apr. 8, 2011; the entire contents of all of which are hereby incorporated by reference herein and made a part of this specification.
BACKGROUND OF THE INVENTION1. Field of the Invention
Certain embodiments disclosed herein relate generally to a heating source for use in a gas appliance. Aspects of certain embodiments may be particularly adapted for single fuel, dual fuel or multi-fuel use. The gas appliance can include, but is not limited to: heaters, boilers, dryers, washing machines, ovens, fireplaces, stoves, etc.
2. Description of the Related Art
Many varieties of heating sources, such as heaters, boilers, dryers, washing machines, ovens, fireplaces, stoves, and other heat-producing devices utilize pressurized, combustible fuels. However, such devices and certain components thereof have various limitations and disadvantages.
SUMMARY OF THE INVENTIONAccording to some embodiments a heating system can include any number of different components such as a fuel selector valve, a pressure regulator, a control valve, a burner nozzle, a burner, and/or an oxygen depletion sensor. In addition, a heating system can be a single fuel, dual fuel or multi-fuel heating system. For example, the heating system can be configured to be used with one or more of natural gas, liquid propane, well gas, city gas, and methane.
In some embodiments a heating system can comprise a fuel selector valve. The fuel selector valve can comprise an input, a first output, a second output, a first valve in-between the input and the first output and a second valve in-between the input and the second output. The first valve can include a first valve body and a first valve seat. The first valve can have a closed position wherein the first valve body is engaged with the first valve seat and an open position wherein the first valve body is disengaged from the first valve seat. The second valve can have a second valve body, a second valve seat and a third valve seat. The second valve can have two closed positions, a first closed position wherein the second valve body is engaged with the second valve seat and a second closed position wherein the second valve body is engaged with the third valve seat, and an open position wherein the first valve body is disengaged from both the second and third valve seats. Further, the fuel selector valve can be configured such that a pressure of a fluid entering the input determines whether either the first valve or the second valve is open.
In some embodiments, the heating system can further include a first fuel pressure regulator in communication with the first output, the first fuel pressure regulator configured to control the flow of fluid within a first predetermined pressure range and a second fuel pressure regulator in communication with the second output, the second fuel pressure regulator configured to control the flow of fluid within a second predetermined pressure range, different from the first. The fuel selector valve may further comprise first and second biasing members, the first biasing member configured to at least partially control the opening and closing of the first valve and the second biasing member configured to at least partially control the opening and closing of the second valve. In some embodiments, the first and second valve seats can be adjustable and configured to be able to calibrate the first and second valves to open and/or close at particular pressures.
In some embodiments, a fuel selector valve can comprise a housing having an input, a first output, and a second output; a first valve in-between the input and the first output, the first valve comprising a first valve body and a first valve seat, the first valve configured to have a closed position wherein the first valve body is engaged with the first valve seat and an open position wherein the first valve body is disengaged from the first valve seat; a second valve in-between the input and the second output, the second valve comprising a second valve body, and a second valve seat, the second valve configured to have a first closed position wherein the second valve body is engaged with the second valve seat and an open position wherein the first valve body is disengaged from the second valve seat; wherein the fuel selector valve is configured such that the first valve and the second valve are configured to move between their respective open and closed position based on a predetermined fluid pressure acting on the valve and the pressure of the fluid entering the input of the fuel selector valve determines whether either the first valve or the second valve is open.
In some embodiments, a fuel selector valve can comprise a housing having an inlet, an outlet, a first flow path therethrough and a second flow path therethrough different from the first flow path; at least one pressure sensitive gate within the housing, wherein the at least one pressure sensitive gate is configured to be open when a fluid within a first pressure range is flowing through the fuel selector valve and closed when a fluid within a second pressure range, different from the first, is flowing through the fuel selector valve, wherein the flow of fluid acts on the gate to either open or close the gate; wherein the fuel selector valve is configured such that when the gate is open, fluid flows through the first flow path and when the gate is closed, fluid flows through the second flow path.
A heating system of certain embodiments can comprise a fuel selector valve, a burner nozzle and a burner. A fuel selector valve can comprise a housing having an inlet, an outlet, a first flow path and a second flow path and at least one pressure sensitive gate within the housing. The at least one pressure sensitive gate can be configured to be open when a fluid within a first pressure range is flowing through the fuel selector valve and closed when a fluid within a second pressure range, different from the first, is flowing through the fuel selector valve, wherein the flow of fluid acts on the gate to either open or close the gate. Further the fuel selector valve can be configured such that when the gate is open, fluid flows through the first flow path and when the gate is closed, fluid flows through the second flow path.
According to some embodiments, the heating system further comprises a first fuel pressure regulator in communication with the output, the first fuel pressure regulator configured to control the flow of fluid within a first predetermined pressure range; and a second fuel pressure regulator in communication with second output, the second fuel pressure regulator configured to control the flow of fluid within a second predetermined pressure range, different from the first.
The at least one pressure sensitive gate of some embodiments can comprise a first and a second pressure sensitive gate. The fuel selector valve can be configured such that when the first pressure sensitive gate is open, the second pressure sensitive gate is closed and when the second pressure sensitive gate is open, the first pressure sensitive gate is closed. The fuel selector valve can be further configured such that when no fluid is flowing through the fuel selector valve both the first and the second pressure sensitive gates are closed.
According to some embodiments, the at least one pressure sensitive gate can comprise a spring-loaded valve, or a magnet and a metal ball. In some embodiments, the fuel selector valve can further comprise first and second biasing members, the first biasing member configured to at least partially control the opening and closing of the first pressure sensitive gate and the second biasing member configured to at least partially control the opening and closing of the second pressure sensitive gate.
In some embodiments a heating system can comprise a burner nozzle and a burner. The burner nozzle can include a housing defining an inlet, an outlet and an inner chamber between the inlet and the outlet. The housing can be a single or multi-piece housing. The burner nozzle may also include a movable body within the inner chamber and a biasing member. The biasing member can be configured to regulate a positional relationship between the body and a wall of the inner chamber in response to a pressure of a fluid flow, flowing through the burner nozzle.
In some embodiments, the positional relationship between the body and the wall of the inner chamber can be configured to determine the amount of fluid flow through the burner nozzle, such that a predetermined increase in pressure of the fluid flow from an at rest position results in the movable body moving closer to the wall of the inner chamber to reduce the cross-sectional area of the flow passage between the body and the wall and correspondingly, a decrease in pressure of the fluid flow results in the movable body moving farther away from the wall of the inner chamber to increase the cross-sectional area of the flow passage between the body and the wall until the rest position is achieved.
In some embodiments of heating system, the positional relationship at a constant temperature of the fluid can provide for a constant BTU value as the pressure of the fuel fluctuates.
Further, in some embodiments, an increase in pressure of the fluid flow from the at rest position can result in the movable body moving closer to the wall of the inner chamber to reduce the cross-sectional area of the flow passage between the body and the wall until the fluid flow causes the movable body to contact the inner wall and stop the flow of fluid through the burner nozzle outlet.
According to certain embodiments, the burner nozzle can further comprise a second outlet, wherein the second outlet is configured to remain open and unobstructed, independent of the position of the movable body. The movable body may further comprise a channel passing therethrough, the channel configured to sealingly connect to the second outlet when the movable body is in contact with the wall of the inner chamber.
According to certain embodiments, a burner nozzle can comprise a housing defining an inlet, a first outlet, a second outlet, and an inner chamber between the inlet and the first and second outlets; a movable body within the inner chamber; and a biasing member configured to regulate the position of the movable body within the inner chamber in response to a pressure of a fluid flow, flowing through the burner nozzle; wherein in a second position of the movable body within the inner chamber, the second outlet being closed by the movable body and the amount of flow allowed through the burner nozzle is less than in a first position and wherein the movable body is configured such that movement between the first and second positions is controlled by the pressure of the fluid flow acting on the biasing member.
In some embodiments, a nozzle can comprise a nozzle housing; an inlet; at least two outlets; a valve comprising a valve body within the nozzle housing and between the inlet and the at least two outlets; and a biasing member wherein the valve and biasing member are configured such that fluid flow of a predetermined pressure acts on the valve body to at least one of 1) open, and 2) close the valve body within the nozzle housing to control fluid flow through the nozzle, wherein independent of the position of the valve body, the nozzle being configured such that at least one of the at least two outlets remains open.
In some embodiments, the burner nozzle can comprise a housing defining an inlet, an outlet and an inner chamber between the inlet and the outlet; a movable body within the inner chamber; and a biasing member configured to regulate a positional relationship between the body and a wall of the inner chamber in response to a pressure of a fluid flow, flowing through the burner nozzle; wherein the positional relationship between the body and the wall of the inner chamber is configured to determine the amount of fluid flow through the burner nozzle, such that a predetermined increase in pressure of the fluid flow from an at rest position results in the movable body moving closer to the wall of the inner chamber to reduce the cross-sectional area of the flow passage between the body and the wall and correspondingly, a decrease in pressure of the fluid flow results in the movable body moving farther away from the wall of the inner chamber to increase the cross-sectional area of the flow passage between the body and the wall until the rest position is achieved.
In some embodiments, a burner nozzle can comprise a housing defining an inlet, an outlet and an inner chamber between the inlet and the outlet; a movable body within the inner chamber; and a biasing member configured to regulate a positional relationship between the body and a wall of the inner chamber in response to a pressure of a fluid flow, flowing through the burner nozzle; wherein in a first position of the movable body within the inner chamber, the amount of flow allowed through the burner nozzle is more than in a second position and wherein the movable body is configured such that movement between the first and second positions is controlled by the pressure of the fluid flow acting on the biasing member.
Certain embodiments of a heating system can comprise a burner and a burner nozzle. The burner nozzle can include a housing defining an inlet, an outlet and an inner chamber between the inlet and the outlet; a movable body within the inner chamber; and a biasing member. The biasing member can be configured to regulate a positional relationship between the body and a wall of the inner chamber in response to a pressure of a fluid flow, flowing through the burner nozzle. According to some embodiments, in a first position of the movable body within the inner chamber, the amount of flow allowed through the burner nozzle is more than in a second position and the movable body can be configured such that movement between the first and second positions is controlled by the pressure of the fluid flow acting on the biasing member.
According to certain embodiments, the pressure of the flow can act on the biasing member through contact with the movable body. In the second position of some embodiments, the movable body can be configured to sealingly connect to the outlet. The movable body may further comprise a channel passing therethrough. In addition, the burner nozzle may further comprise a second outlet, and when the movable body is in the second position fluid flow can be prevented through the second outlet. In some embodiments, the burner nozzle can further include a second outlet, and when the movable body is in the second position flow of fluid is prevented through either of the outlet or the second outlet.
In some embodiments, a heating system can include a burner, a nozzle and a biasing member. The nozzle can have a nozzle housing, an inlet, an outlet and a valve body within the nozzle housing and between the inlet and the outlet. The valve body and biasing member can be configured such that fluid flow of a predetermined pressure acts on the valve body to at least one of 1) move, 2) open, and 3) close the valve body within the nozzle housing to control fluid flow through the nozzle.
In some embodiments, the heating system can also include an end cap within the outlet of the nozzle housing. The end cap can have a first end configured to be manipulated so as to adjust the position of the end cap within the outlet and at least one orifice passing through the end cap. The nozzle housing can be configured such that when the valve body is in an open position, fluid flows through the nozzle entering at the inlet and exiting at the outlet through the at least one orifice. The nozzle can be configured such that adjusting the position of the end cap adjusts at least one of the predetermined pressure required to 1) move, 2) open, and 3) close the valve body within the nozzle housing.
Many different types of end caps can be used. For example, the biasing member can be between the end cap and the valve body, the end cap configured to calibrate the nozzle to adjust the pressure required to move the valve body to an open position. In some examples, the end cap is a set screw. Also, the end of the end cap can cooperate with a tool to adjust the position of the end cap relative to the valve body. This end of the end cap can include a detent. The end cap can be adjusted from outside of the nozzle. The end cap can also include an orifice and/or the at least one orifice.
In some embodiments a heating system can comprise an oxygen depletion sensor (ODS). An ODS can include an igniter, an inlet, an outlet, a first injector, a second injector, a first valve body and a first biasing member to control flow of fuel from the inlet to the first injector and a second valve body and a second biasing member to control flow of fuel from the inlet to the second injector. There may be one or two, or more inlets and outlets. At a first predetermined fluid pressure the first valve can be open and the second valve can be closed and at a second predetermined fluid pressure, greater than the first, the first valve can be closed by the second predetermined fluid pressure acting on the first valve and the second valve can be opened by the second predetermined fluid pressure acting on the second valve.
The valves can be set such that the first biasing member is configured to open the first valve by the first predetermined fluid pressure acting on the first valve, the first predetermined fluid pressure being insufficient to open the second valve.
In some embodiments, an ODS can comprise a housing having a single inlet and a single outlet, and having a first fluid flow path and a second fluid flow path through the housing between the inlet and the outlet; a first air intake; a second air intake; a first injector within the housing and defining part of the first fluid flow path, the first injector comprising a first orifice, the first orifice configured to direct a first fuel from the inlet and towards the outlet while drawing air into the housing through the first air intake; a second injector within the housing and defining part of the second fluid flow path, the second injector comprising a second orifice, second first orifice configured to direct a second fuel from the inlet and towards the outlet while drawing air into the housing through the second air intake, wherein the first fuel is at a pressure different from the second fuel; a first valve within the housing and defining part of the first fluid flow path, the first valve configured to control the flow of fuel to the first injector; and a second valve within the housing and defining part of the second fluid flow path, the second valve configured to control the flow of fuel to the second injector.
According to some embodiments, a heating system can have a burner, a control valve, and a nozzle. The control valve can include a control valve housing, an input, an output and a first valve body within the control valve housing configured such that the position of the first valve body within the control valve housing determines whether the input is in fluid communication with the output and how much fluid can flow therebetween.
A nozzle in some embodiments can include a nozzle housing, a second valve within the nozzle housing, an inlet, at least two outlets, and a biasing member configured such that the second valve is open during fluid flow of a first predetermined pressure, and fluid flow of a second predetermined pressure causes the second valve to close one of the at least two outlets while one of the at least two outlets remains open.
Various embodiments are depicted in the accompanying drawings for illustrative purposes, and should in no way be interpreted as limiting the scope of the inventions, in which like reference characters denote corresponding features consistently throughout similar embodiments.
Many varieties of space heaters, wall heaters, stoves, fireplaces, fireplace inserts, gas logs, and other heat-producing devices employ combustible fluid fuels, such as liquid propane and natural gas. The term “fluid,” as used herein, is a broad term used in its ordinary sense, and includes materials or substances capable of fluid flow, such as, for example, one or more gases, one or more liquids, or any combination thereof. Fluid-fueled units, such as those listed above, generally are designed to operate with a single fluid fuel type at a specific pressure or within a range of pressures. For example, some fluid-fueled heaters that are configured to be installed on a wall or a floor operate with natural gas at a pressure in a range from about 3 inches of water column to about 6 inches of water column, while others are configured to operate with liquid propane at a pressure in a range from about 8 inches of water column to about 12 inches of water column. Similarly, some gas fireplaces and gas logs are configured to operate with natural gas at a first pressure, while others are configured to operate with liquid propane at a second pressure that is different from the first pressure. As used herein, the terms “first” and “second” are used for convenience, and do not connote a hierarchical relationship among the items so identified, unless otherwise indicated.
Certain advantageous embodiments disclosed herein reduce or eliminate various problems associated with devices having heating sources that operate with only a single type of fuel source. Furthermore, although certain of the embodiments described hereafter are presented in a particular context, the apparatus and devices disclosed and enabled herein can benefit a wide variety of other applications and appliances.
The heater 100 can comprise a housing 200. The housing 200 can include metal or some other suitable material for providing structure to the heater 100 without melting or otherwise deforming in a heated environment. In the illustrated embodiment, the housing 200 comprises a window 220, one or more intake vents 240 and one or more outlet vents 260. Heated air and/or radiant energy can pass through the window 220. Air can flow into the heater 100 through the one or more intake vents 240 and heated air can flow out of the heater 100 through the outlet vents 260.
Within the housing 200, the heater 100, or other gas appliance, can include a heating assembly or heating source 10. A heating assembly 10 can include at least one or more of the components described herein.
With reference to
In some embodiments, including the illustrated embodiment, the heater 100 comprises a burner 190. The ODS 180 can be mounted to the burner 190, as shown. The nozzle 160 can be positioned to discharge a fluid, which may be a gas, liquid, or combination thereof into the burner 190. For purposes of brevity, recitation of the term “gas or liquid” hereafter shall also include the possibility of a combination of a gas and a liquid.
Where the heater 100 is a dual fuel heater, either a first or a second fluid is introduced into the heater 100 through the regulator 120. Still referring to
For example, turning to
Different fuels are generally run at different pressures.
As shown in the chart, city gas can be a combination of one or more different gases. As an example, city gas can be the gas typically provided to houses and apartments in China, and certain other countries. At times, and from certain sources, the combination of gases in city gas can be different at any one given instant as compared to the next.
Because each fuel has a typical range of pressures that it is delivered at, these ranges can advantageously be used in a heating assembly to make certain selections in a pressure sensitive manner. Further, certain embodiments may include one or more pressure regulators and the pressure of the fluid flow downstream of the pressure regulator can be generally known so as to also be able to make certain selections or additional selections in a pressure sensitive manner.
As illustrated, the fuel selector valve 110 of
As will be shown hereafter, in the various embodiments, there can be one or more valves, gates, or doors 12, 14 that can function in different ways, as well as one or more channels 16, 18 within the housing 24. The gates, doors or valves 12, 14 can work in many different ways to open or close and to thereby establish or deny access to a channel 16, 18. The channels 16, 18 can direct fluid flow to an appropriate flow passage, such as to the appropriate pressure regulator 20, 22, if pressure regulators are included in the heating assembly (
The shown fuel selector valve 110 of
For example, the front portions 30, 40 can be threadedly received into the channels 16, 18. This can allow a user to adjust the position of the front portions 30, 40 within the channels and thereby adjust the compression on the spring, as can best be seen in
Fluid pressure acting on the valve 12, 14, such as through the holes 42 can force the valve to open.
In some embodiments, the fuel selector valve 110 can be used in a dual fuel appliance, such as an appliance configured to use with NG or LP. In this situation, the first threshold pressure to open valve 14 may be set to be between about 3 to 8 inches of water column, including all values and sub-ranges therebetween. In some embodiments, the first threshold pressure is about: 3, 4, 5, 6, 7 or 8 inches of water column. The second threshold pressure to close valve 14 may be set to be between about 5 to 10 inches of water column, including all values and sub-ranges therebetween. The third threshold pressure to open valve 12 can be set to be between about 8 to 12 inches of water column, including all values and sub-ranges therebetween. In some embodiments, the third threshold pressure is about: 8, 9, 10, 11 or 12 inches of water column. In a preferred embodiment, the first and second threshold pressures are between about 3 to 8 inches of water column, where the second is greater than the first and the third threshold pressure is between about 10 to 12 inches of water column. In this embodiment, as in most dual fuel embodiments, the ranges do not overlap.
Returning now to calibration, for certain springs, as the spring is compressed it can require a greater force to further compress the spring. Thus, moving the front portion 30, 40 away from the respective valve 12, 14 would decrease the force required to initially compress the spring, such as to move the valve 14 from a closed position (
In some embodiments, a spring can be used that has a linear spring force in the desired range of movement, compression or extension, used in the fuel selection valve. The spring force for a particular use of a particular spring can be based on many different factors such as material, size, range of required movement, etc.
Turning now to
The front 30, 40 and rear 36, 38 portions can be used to position the valve 12, 14 within the housing 24. For example, the rear portions 36, 38 can surround a central region of the valve and the valve can move or slide within the rear portion. Further the spring 32, 34 can be between the valve and the rear portion. The front portions 30, 40 can have one or more holes 42 passing therethrough. Fluid pressure acting on the valve 12, 14, such as through the holes 42 can force the valve to open. In some embodiments, the front portions 30, 40 can have a channel 50. The channel 50 can be used to guide movement of the valve. In addition, the channel can direct fluid flow at the valve to open the valve. Because there are no exits in the channel, fluid flow does not pass around the valve but rather remains constantly acting against the valve as long as there is flow through the fuel selector valve 110.
In other embodiments, the front and/or rear portions can be permanently or integrally attached to the housing 24. Some embodiments do not have either or both of a front or rear portion.
Each of
It will be understood that any of the pressure sensitive valves described herein, whether as part of a fuel selector valve, nozzle, or other component of the heating assembly, can function in one of many different ways, where the valve is controlled by the pressure of the fluid flowing through the valve. For example, many of the embodiments shown herein comprise helical or coil springs. Other types of springs, or devices can also be used in the pressure sensitive valve. Further, the pressure sensitive valves can operate in a single stage or a dual stage manner. Many valves described herein both open and close the valve under the desired circumstances (dual stage), i.e. open at one pressure for a particular fuel and close at another pressure for a different fuel. Single stage valves may also be used in many of these applications. Single stage valves may only open or close the valve, or change the flow path through the valve in response to the flow of fluid. Thus for example, the fuel selector valve 110 shown in
As discussed previously, the fuel selector valve 110 can be used to determine a particular fluid flow path for a fluid at a certain pressure or in a pressure range. Some embodiments of heating assembly can include first and second pressure regulators 20, 22. The fuel selector valve 110 can advantageously be used to direct fluid flow to the appropriate pressure regulator without separate adjustment or action by a user.
In some embodiments, the first and second pressure regulators 20, 22 are separate and in some embodiments, they are connected in a regulator unit 120, as shown in
The pressure regulators 20, 22 can function in a similar manner to those discussed in U.S. application Ser. No. 11/443,484, filed May 30, 2006, now U.S. Pat. No. 7,607,426, incorporated herein by reference and made a part of this specification; with particular reference to the discussion on pressure regulators at columns 3-9 and FIGS. 3-7 of the issued patent.
The first and second pressure regulators 20, 22 can comprise spring-loaded valves or valve assemblies. The pressure settings can be set by tensioning of a screw that allows for flow control of the fuel at a predetermined pressure or pressure range and selectively maintains an orifice open so that the fuel can flow through spring-loaded valve or valve assembly of the pressure regulator. If the pressure exceeds a threshold pressure, a plunger seat can be pushed towards a seal ring to seal off the orifice, thereby closing the pressure regulator.
The pressure selected depends at least in part on the particular fuel used, and may desirably provide for safe and efficient fuel combustion and reduce, mitigate, or minimize undesirable emissions and pollution. In some embodiments, the first pressure regulator 20 can be set to provide a pressure in the range from about 3 to 6 inches of water column, including all values and sub-ranges therebetween. In some embodiments, the threshold or flow-terminating pressure is about: 3, 4, 5, or 6 inches of water column. In some embodiments, the second pressure regulator 22 can be configured to provide a second pressure in the range from about 8 to 12 inches of water column, including all values and sub-ranges therebetween. In some embodiments, the second threshold or flow-terminating pressure is about: 8, 9, 10, 11 or 12 inches of water column.
The pressure regulators 20, 22 can be preset at the manufacturing site, factory, or retailer to operate with selected fuel sources. In many embodiments, the regulator 120 includes one or more caps to prevent consumers from altering the pressure settings selected by the manufacturer. Optionally, the heater 100 and/or the regulator unit 120 can be configured to allow an installation technician and/or user or customer to adjust the heater 100 and/or the regulator unit 120 to selectively regulate the heater unit for a particular fuel source.
Returning now to
The control valve 130 can control the amount of fuel flowing through the control valve to various parts of the heating assembly. The control valve 130 can manually and/or automatically control when and how much fuel is flowing. For example, in some embodiments, the control valve can divide the flow into two or more flows or branches. The different flows or branches can be for different purposes, such as for an oxygen depletion sensor (ODS) 180 and for a burner 190. In some embodiments, the control valve 130 can output and control an amount of fuel for the ODS 180 and an amount of fuel for the burner 190.
Turning now to the nozzle 160, one embodiment of a nozzle 160 is shown in
The nozzle body can include a flange 68 and threads 70. The flange and threads can be used to attach the nozzle to another structure, such as a pipe or line running from the control valve. In some embodiments, the flange 68 is configured to be engaged by a tightening device, such as a wrench, which can aid in securing the nozzle 160 to a nozzle line. In some embodiments, the flange 68 comprises two or more substantially flat surfaces, and in other embodiments, is substantially hexagonal as shown.
The nozzle body 62 can define a substantially hollow cavity or pressure chamber 16′. The pressure chamber 16′ can be in fluid communication with an inlet and an outlet. In some embodiments, the outlet defines an outlet area that is smaller than the area defined by the inlet. In preferred embodiments, the pressure chamber 16′ decreases in cross-sectional area toward a distal end thereof.
As can be seen, a front ledge 43′ on the valve 12′ can contact the front portion 30′ such that the flow passages or holes 42′ are blocked, when the nozzle is in the initial “off” position (
The nozzle 160 can be used in single fuel, dual fuel or multi-fuel appliances. For example, the nozzle 160 can be used in a dual fuel appliance, such as an appliance configured for use with either of NG or LP. In this situation, the first threshold pressure to open valve 12′ may be set to be between about 3 to 8 inches of water column (for NG), including all values and sub-ranges therebetween. In some embodiments, the first threshold pressure is about: 3, 4, 5, 6, 7 or 8 inches of water column. The second threshold pressure to close orifice 64 may be set to be above about 8 inches of water column (for LP). In some embodiments, the second threshold pressure is about: 8, 9, 10, 11 or 12 inches of water column. In this way the nozzle 160 can be used with different fuels and yet provide an amount of fuel to the burner 190 that will create similar size of flames and/or BTU values.
Similar to the fuel selector valve 110, the front portion 30′ of the nozzle 160 can be adjusted to calibrate the threshold pressures. In some embodiments, the spring 32′, as well as, other single or dual stage springs discussed herein, can have a spring constant (K) of about 0.0067 N/mm, between about 0.006-0.007 N/mm, or between about 0.005-8.008 N/mm. The spring can be approximately 7 mm, or between approximately 6-8 mm long. The spring can have an outer diameter between approximately 5-9 mm. The spring can be made from wire that is approximately 0.15 mm, 0.2 mm, or between approximately 0.1-0.3 mm in diameter. Other sizes, lengths and spring constants can also be used.
The nozzle 160 is shown together with a control valve 130 in
Two examples are shown in
Returning now to
The first valve body 134 can be used to provide an “OFF” position and two “ON” positions. The two “ON” positions can be a high flow position and a low flow position. The flow of fuel into the control valve can be greater in the high flow position then in the low flow position. The valve body 134 can control the flow by providing two or more different size holes 138 through which the fuel can flow.
The second valve body 134′ can be used to provide an “OFF” position and an “ON” position. The “ON” position can be adjustable to provide different amounts of fuel depending on the position of the valve body within the control valve housing. For example, the valve body 134′ can have low and high positions and can be adjustable between those two positions. Thus, the amount of fuel flow can be adjusted to a desired setting that may include, low, high, medium, or something in-between those positions.
The different “ON” positions in the valve bodies 134, 134′ can be facilitated by one or more holes or slots 138. The holes/slots can be different sizes, and/or can change size along their length. Valve body 134 has two different sized holes 138 and valve body 134′ has a slot 138 that changes size along its length. The control valve housing 136 can have an inlet 135. The position of the valve body within the housing 136 determines whether the hole or slot 138 is in fluid communication with the inlet 135 and how much fuel can flow through the control valve 130.
The cross-section in
For example, the nozzle 160 and control valve 130 can be set such that one fuel that flows at a known pressure opens the valve 12′ and allows the exit orifice 64 to remain open while a second fuel opens the valve 12′ yet closes the exit orifice 64. The second fuel flow would only pass through the exit orifices 66. The nozzle 160 and control valve 130 can be set so that this is the case independent of the position of the control valve 130. In other words, whether the control valve 130 is set to a high “ON” position or a low “ON” position the nozzle 160 would operate with a predetermined exit orifice configuration based on the type of fuel used (based on the expected pressure range of that fuel).
Now looking to
This is a result of the ideal gas law:
PV=nRT (1)
where “P” is the absolute pressure of the gas, “V” is the volume, “n” is the amount of substance; “R” is the gas constant, and “T” is the absolute temperature. Where amount and temperature remain constant, pressure and volume are inversely related. Thus, as the pressure increases, less volume of fuel is needed to provide the same amount of fuel. The amount is typically recorded in number of moles. A set number of moles of fuel will provide a particular BTU value. Therefore, the pressure sensitive nozzle shown in
In some embodiments, the valve 12′ can have an end 73 that cooperates with the internal chamber 16′ to determine the volume of fluid that can flow through the valve 12′. For example, the valve end 73 can be cylindrical while a surface 74 of the internal chamber 16′ can be frustoconical. Thus, as the cylinder valve end 73 approaches the frustoconical surface 74 the gap 76 between the two surfaces can slowly decrease, thus a smaller volume of fuel can pass through the gap 76.
In some embodiments, the nozzle 160 shown in
In the various embodiments of valves, including those within a nozzle, adjustments can be made to calibrate the valve. For example, in
In some embodiments, the position of the rear portion 36′, as well as, or in addition to the front portion 30′ can be adjusted to calibrate the nozzle. For example, the rear portion 36′ can be threadedly received into the interior of the nozzle. Further, the front and rear portions can be adjustable from either or both of inside and outside the housing 62. In some embodiments, the heating assembly can allow for calibration of one or more of the various valves without disassembly of the heating assembly.
Turning now to
As illustrated, the adjustment feature 88 can have a frustoconical interior surface 74′ similar to the valve interior of
The adjustment feature 88 can also be used with other valves and/or nozzles, for example, the nozzles shown in
The ODS 180 shown includes a thermocouple 182, an electrode 80 and an ODS nozzle 82. The ODS nozzle 82 can include an injector 84 and an air inlet 86. A fuel can flow from the ODS line 143 through the ODS nozzle 82 and toward the thermocouple 182. The fuel flows near the air inlet 86, thus drawing in air for mixing with the fuel.
In some embodiments, the injector 84 can be a pressure sensitive injector and can include any of the features of the pressure sensitive nozzles described herein. For example, the exit orifices 64 and/or 66 can be located along line A-A of
The electrode 80 can be used to ignite fuel exiting the ODS nozzle 82. In some embodiments, a user can activate the electrode 80 by depressing the igniter switch 186 (see
In various embodiments, the ODS 180 provides a steady pilot flame that heats the thermocouple 182 unless the oxygen level in the ambient air drops below a threshold level. In certain embodiments, the threshold oxygen level is between about 18 percent and about 18.5 percent. In some embodiments, when the oxygen level drops below the threshold level, the pilot flame moves away from the thermocouple, the thermocouple cools, and the control valve 130 closes, thereby cutting off the fuel supply to the heater.
Referring first to
The valve 110′ can be similar to those described herein, such as that in
Looking to
In some embodiments with two outlets 95, the outlets can be located the same or different distances away from the thermocouple. Also, the ODS can include one or more thermocouples 182 and igniters 80. In some embodiments, the ODS can have one or more flame directors 97. The flame directors 97 can be used to position the flame in a predetermined relationship to the thermocouple. Further, the embodiments shown in
A filter 96 can be included anywhere along the fuel flow path within the heating assembly. As shown in
In some embodiments, the valve 110′ can allow for calibration of the valves 12″, 14″ from outside the housing. The front portions 30″, 40″ can pass through the housing 24 and can include a detent 90′. The detent can be used to adjust the position of the front portion within the valve 110′. For example, the detent 90′ can receive the head of a screw driver, Allen wrench or other tool to adjust the position of the front portion.
Turning now to
Referring first to
The spring 32′ can be a single stage or a dual stage spring. As shown, the spring 32′ is a single stage spring and is configured to move from a first position to a second position at a set pressure. In the second position, the valve 12″ can reduce or block flow through the nozzle 160. As shown in
The valve 12″ can have a passage 140 through which fluid, such as fuel, can pass. The passage 140 can have an inlet 142 and an outlet 144. As shown, there is one inlet 142 and two outlets 144, though any number of inlets and outlets can be used. The passage can be in central region or can direct fluid to or through a central region of the valve 12″. The valve 12″ can also include a front ledge 43″. The front ledge 43″ and the passage 140 can be used to direct all, or a substantial portion, of the fluid flow through the valve 12″ and can increase the forces acting on the valve to reliably open and/or close the valve.
Turning now to
The front portion 130″′ can secure the washer 150 and diaphragm 146 in place within the nozzle. For example, in the cross section of
The diaphragm 146 can act as a spring force and in some embodiments can replace the spring 32′. In some embodiments, the spring 32′ can serve to return the diaphragm 146 to an initial position. In some embodiments, the diaphragm can be set to allow the valve 12″′ to move at a set fluid pressure, such as at 8 inches water column, or other pressures as has been described herein with reference to other valves. In some embodiments, the diaphragm can be made from various materials including silicone and/or rubber.
The valves 12″ and 12″′ can advantageously have an increased surface area that is exposed to the fluid flowing through the nozzle. This increased exposure can lead to increased repeatability and reliability of the nozzle under different flow circumstances. The increased surface area can help ensure that the valve sealingly closes the hole 64. Having the fluid flow through the valve and in particular, flow through the central region of the valve can focus the fluid pressure in the center of the valve. As the hole 64 is aligned with the center of the valve focusing the fluid pressure at the center of the valve can increase the reliability of the valve, sealing the hole at increased pressures. In addition, the diaphragm has the added benefit of regulating the gas pressure similar to a typical pressure regulator. This can beneficially provide additional fluid pressure regulation throughout a heater system.
In some embodiments, a fuel selector valve and/or an ODS can also have a valve with a passage therethrough and/or a diaphragm.
Advantageously, certain embodiments of the heating assembly as described herein facilitates a single appliance unit being efficaciously used with different fuel sources. This desirably saves on inventory costs, offers a retailer or store to stock and provide a single unit that is usable with more than one fuel source, and permits customers the convenience of readily obtaining a unit which operates with the fuel source of their choice.
Advantageously, certain embodiments of the heating assembly can transition between the different operating configurations as desired with relative ease and without or with little adjustment by an installer and/or an end user. Preferably, a user does not need to make a fuel selection through any type of control or adjustment. The systems described herein can alleviate many of the different adjustments and changes required to change from one fuel to another in many prior art heating sources.
It will be understood that the embodiments and components described herein can be used with, without and/or instead of other embodiments and components as described herein or otherwise. For example, the fuel selector valve described herein can be connected to the regulator 120 of the heater 100 shown in
Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures or characteristics of any embodiment described above may be combined in any suitable manner, as would be apparent to one of ordinary skill in the art from this disclosure, in one or more embodiments.
Similarly, it should be appreciated that in the above description of embodiments, various features of the inventions are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. This method of disclosure, however, is not to be interpreted as reflecting an intention that any claim require more features than are expressly recited in that claim. Rather, as the following claims reflect, inventive aspects lie in a combination of fewer than all features of any single foregoing disclosed embodiment. Thus, the claims following the Detailed Description are hereby expressly incorporated into this Detailed Description, with each claim standing on its own as a separate embodiment.
Claims
1. A heating system comprising:
- a burner nozzle; and
- a burner;
- wherein the burner nozzle comprises: a housing defining an inlet, an outlet and an inner chamber between the inlet and the outlet; a movable body within the inner chamber; and a biasing member configured to regulate a positional relationship between the body and a wall of the inner chamber in response to a pressure of a fluid flow, flowing through the burner nozzle;
- wherein the positional relationship between the body and the wall of the inner chamber is configured to determine the amount of fluid flow through the burner nozzle, such that a predetermined increase in pressure of the fluid flow from an at rest position results in the movable body moving closer to the wall of the inner chamber to reduce the cross-sectional area of the flow passage between the body and the wall and correspondingly, a decrease in pressure of the fluid flow results in the movable body moving farther away from the wall of the inner chamber to increase the cross-sectional area of the flow passage between the body and the wall until the rest position is achieved.
2. The heating system of claim 1, wherein the positional relationship is configured such that at a constant temperature of the fluid, the heating system provides for a constant BTU value as the pressure of the fuel fluctuates.
3. The heating system of claim 1, wherein an increase in pressure of the fluid flow from the at rest position results in the movable body moving closer to the wall of the inner chamber to reduce the cross-sectional area of the flow passage between the body and the wall until the fluid flow causes the movable body to contact the inner wall and stop the flow of fluid through the burner nozzle outlet.
4. The heating system of claim 1, wherein at least a section of the wall of the inner chamber is frustoconical.
5. The heating system of claim 4, wherein at least a section of the movable body is cylindrical.
6. The heating system of claim 1, wherein the movable body further comprises a gasket, such that the gasket is configured to engage the wall of the inner chamber if the movable body is forced into contact with the inner wall.
7. The heating system of claim 1, wherein the burner nozzle further comprises a second outlet, wherein the second outlet is configured to remain open and unobstructed, independent of the position of the movable body.
8. The heating system of claim 7, wherein the movable body further comprises a channel passing therethrough, the channel configured to sealingly connect to the second outlet when the movable body is in contact with the wall of the inner chamber.
9. The heating system of claim 1, wherein the heating system is part of a water heater, a fireplace, a gas oven, a stove, a BBQ, or a gas dryer.
10. The heating system of claim 2, wherein the heating system is a multi-fuel heating system, configured to be used with a plurality of different fuels.
11. The heating system of claim 10, wherein the multi-fuel heating system is configured to be used with one or more of natural gas, liquid propane, well gas, city gas, and methane.
12. The heating system of claim 1, further comprising a gas valve configured to control fluid flow through the heating system and to the burner.
13. The heating system of claim 1, wherein the housing comprises an one piece housing.
14. The heating system of claim 1, further comprising at least one of an adjustable valve seat and an adjustable end cap configured to calibrate the movable body.
15. A heating system comprising:
- a burner; and
- a burner nozzle comprising: a housing defining an inlet, an outlet and an inner chamber between the inlet and the outlet; a movable body within the inner chamber; and a biasing member configured to regulate a positional relationship between the body and a wall of the inner chamber in response to a pressure of a fluid flow, flowing through the burner nozzle;
- wherein in a first position of the movable body within the inner chamber, the amount of flow allowed through the burner nozzle is more than in a second position and wherein the movable body is configured such that movement between the first and second positions is controlled by the pressure of the fluid flow acting on the biasing member.
16. The heating system of claim 15, wherein the pressure of the flow acts on the biasing member through contact with the movable body.
17. The heating system of claim 15, wherein in the second position the movable body is configured to sealingly connect to the outlet.
18. The heating system of claim 17, wherein the movable body further comprises a channel passing therethrough.
19. The heating system of claim 18, wherein the burner nozzle further comprises a second outlet, and when the movable body is in the second position fluid flow is prevented through the second outlet.
20. The heating system of claim 17, wherein the burner nozzle further comprises a second outlet, and when the movable body is in the second position flow of fluid is prevented through either of the outlet or the second outlet.
21. The heating system of claim 15, wherein the heating system is part of a water heater, a fireplace, a gas oven, or a gas dryer.
22. The heating system of claim 15, wherein the biasing member comprises at least one of a spring and a diaphragm.
Type: Application
Filed: Jun 7, 2011
Publication Date: Jan 19, 2012
Inventor: David Deng (Diamond Bar, CA)
Application Number: 13/155,339
International Classification: F24C 3/00 (20060101);
