Air Conditioning System Treatment Applicator
An applicator for introducing an air conditioning system treatment into an air conditioning system refrigerant flow path. The applicator comprises a reservoir carrying the treatment, the reservoir having first and second caps closing first and second reservoir openings, each of the first and second caps including a hose fitting. First and second hoses are connected between respective first and second valves in the refrigerant flow path and the respective first and the second fittings. A pressure differential between the first and the second valves (a higher pressure at the first valve than at the second valve) forces the treatment from the reservoir through the second hose into the second valve in the refrigerant flow path.
The present application claims the benefit under Section 119(e) of the provisional application filed on Dec. 21, 2008 and assigned application No. 60/871,267.
FIELD OF THE INVENTIONThe present invention relates generally to air conditioning systems and specifically to an applicator for injecting an air conditioning system treatment into the system's coolant path.
BACKGROUND OF THE INVENTIONAn air conditioning system provides a cooing effect according to a closed thermal refrigeration cycle. As illustrated in
A pressurized liquid refrigerant, such as Freon, enters the evaporator 22 via an expansion valve 32 that lowers the liquid pressure, allowing the refrigerant to vaporize (boil) at a lower temperature, thus ensuring that the refrigerant absorbs a maximum quantity of heat as it passes through the evaporator coif. As the reduced-pressure, liquid absorbs heat from the air (the cold refrigerated space) surrounding the evaporator 22 the refrigerant temperature reaches its boiling point and evaporates to a gas.
From the evaporator 22, the low-pressure gas flows to the compressor 14 where the gas is compressed to a high-pressure state. The higher pressure permits the gas to give up more heat (than a lower pressure gas), ensuring that the gas condenses to a liquid state during the next stage (condenser) of the refrigerate cycle. From the compressor 14, the pressurised gas enters the condenser 18 where the gas condenses to a high-pressure liquid, giving up heat to the warm environment surrounding the condenser 18. The refrigerant then returns to the evaporator 22 via the expansion valve 32 as a low pressure liquid.
An electric motor or an internal combustion engine (not shown) supplies fee mechanical rotational energy required to operate the compressor 14 to compress the vapor and circulate the refrigerant Power consumed by the air conditioning system 10 is directly related to the energy required to operate the compressor 14 and in turn related to compressor Motional forces that must be overcome by the electric motor or the internal combustion engine. Higher frictional forces raise the power consumption of the compressor 14. Generally, a lubricating oil is added to the system to circulate with the refrigerant to reduce these frictional forces.
The present invention can be more easily understood and the advantages and uses thereof more readily apparent when the following detailed description of the present invention is read in conjunction with the figures wherein:
In accordance with common practice, the various described device features are not drawn to scale, but are drawn to emphasize specific features relevant to the invention. Like reference characters denote like elements throughout the figures and text.
DETAILED DESCRIPTION OF THE INVENTIONBefore describing in detail the exemplary methods and apparatuses related to an air conditioning system treatment applicator, it should be observed that the present invention resides primarily in a novel and non-obvious combination of elements and process steps. So as not to obscure the disclosure with details that will be readily apparent to those skilled in the art, certain conventional elements and steps have been presented with lesser detail, while the drawings and the specification describe in greater detail other elements and steps pertinent to understanding the invention.
The following embodiments are not intended to define limits as to the structure or method of the invention, but only to provide exemplary constructions. The embodiments are permissive rather than mandatory and illustrative rather than exhaustive.
An air conditioning system treatment is described in a co-pending and co-owned patent application entitled Air Conditioning System Treatment filed on Nov. 16, 2006 and assigned application Ser. No. 11/560,506. which is hereby incorporated by reference.
The system treatment described in the patent application is loaded into an air conditioning system, such as the prior art air conditioning system 10 of
The operation of connecting each hose 126A/126B to its respective valve 122A/122B actuates a condition-controlling pin that opens the valve 122A/122B. The technician then purges the hoses 126 of air according to techniques known in the art. The technician opens the shut-off valves 130, permitting the air conditioning refrigerant to flow from the valve 122A (the high pressure side) through the reservoir 104 and back into the air conditioning system 120 at the valve 122B (the low pressure side), in a direction illustrated by arrowheads 140. As the refrigerant flows through the reservoir 104 the high-side pressure overcomes the pressure within the reservoir 104 and forces the air conditioning treatment fluid from the reservoir 104 into the air conditioning system. Generally, the process of loading the treatment into the air conditioning system takes less than about 20 seconds. The reservoir 104 may comprise a clear material permitting the technician to determine when all the treatment has been removed from the reservoir 100. The technician then closes the valves 130 to isolate the applicator 100 from the air conditioning system. The hoses 126 are removed, causing the valves 122A and 122B to return to their normally closed state.
In one embodiment an agitating element 116 (see
According to another (optional) embodiment for injecting the treatment into the refrigerant system, the treatment is mixed with a pressurized canister of refrigerant. When connected to the valve 1228, the pressure within the canister forces the refrigerant and the treatment from the canister into the air conditioning system. Such a canister 200 is illustrated in phantom in
Because air in the refrigerant path 124 is not desired, to avoid injecting air into the refrigerant path, it is preferred to purge all air from the reservoir 104 during or after filling the reservoir 104 with the air conditioning treatment. To accomplish this purging according to one embodiment, the applicator 100 is oriented in a vertical position during the treatment filling process. The upper and lower fitting caps 114 are removed from the respective upper and lower fittings 112 and treatment is pumped into the reservoir 104 from the bottom through a lower hose 150 (see
The upper hose 152 is then removed and the upper fitting cap 114 (see
In one embodiment each fitting 112 is formed integral with its respective end cap 108/110. In another embodiment each cap 108/110 comprises a polyvinyl chloride cap into which the fitting 112 is adhesively inserted. The end caps 112 are further adhesively affixed to the reservoir 104 according to known techniques, including use of an adhesive.
In another embodiment, an end cap 170 (particularly for use as the upper end cap 108 when oriented as illustrated in
After completing the process of filling the reservoir 104 with the treatment, as described above, the end cap 170 may be affixed to the reservoir 104 in lieu of the end cap 108. The fingers 180 extending into the interior region of the reservoir 104 ensure that substantially all the air is evacuated therefrom by forcing and remaining air through the upper fitting 112.
While the present invention has been described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalent elements may be substituted for the elements thereof without departing from the scope of the invention. The scope of the present invention further includes any combination of elements from the various embodiments set forth herein. In addition, modifications may be made to adapt a particular situation to the teachings of the present invention without departing from its essential scope. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include alt embodiments falling within the scope of the appended claims.
Claims
1. An applicator for introducing an air conditioning system treatment into an air conditioning system refrigerant flow path through first and second hoses connected between the refrigerant flow path and the applicator, the flow path further comprising first and second serial valves, the applicator comprising:
- a reservoir carrying the treatment;
- first and second caps closing the reservoir;
- a first and a second fitting within the respective first and second caps;
- wherein the first and the second hoses are connected between the respective first and second valves and the first and the second fittings, and wherein a pressure differential between the first and the second valves forces the treatment from the reservoir through the second hose into the refrigerant flow path.
2. The applicator of claim 1 wherein the first end cap comprises fingers extending from an interior surface of the first end cap into an interior region of the reservoir.
3. The applicator of claim 1 further comprising an agitator within the reservoir for agitating the treatment to promote mixing of the treatment and the refrigerant.
4. The applicator of claim 1 wherein the reservoir comprises a hollow tubular element, and wherein the first and the second caps are disposed at opposing ends of the tubular element.
5. The applicator of claim 1 wherein the first and the second valves each comprise a normally-dosed pin that is moved to an open condition when the first and the second hoses are connected to the respective first and second valves.
6. The applicator of claim 1 wherein the first and the second valves each comprise a Schrader valve.
7. The applicator of claim 1 wherein the first and the second valves are disposed at the respective high and low pressure sides of a compressor in the refrigerant flow path.
8. The applicator of claim 7 wherein flow of refrigerant from the high pressure side to the low pressure side through the reservoir forces the treatment from the reservoir through the second hose into the refrigerant flow path.
9. The applicator of claim 7 wherein a pressure differential between the first and the second valves, with the pressure greater at the first valve than at the second valve, forces the treatment from the reservoir through the second hose into the refrigerant flow path.
10. A method of introducing an air conditioning system treatment in a reservoir into an air conditioning system refrigerant Bow path, the method comprising:
- connecting a first opening in the reservoir to a first end of a first hose;
- connecting a second end of the first hose to a first valve in the refrigerant flow path;
- connecting a second opening in the reservoir to a first end of a second hose;
- connecting a second end of the second hose to a second valve in the refrigerant low path, wherein a pressure at the first valve is greater than a pressure at the second valve; and
- opening the first and the second valves to create a higher pressure at the first opening than a pressure at the second opening, wherein a pressure difference forces the treatment from the second opening into the refrigerant flow path.
11. The method of claim 10 wherein the step of connecting the second end of the first hose to the first valve opens the first valve and the step of connecting the second end of the second hose to the second valve opens the second valve.
12. The method of claim 10 wherein one or both of the first and the second hoses further comprises a respective third and fourth valve, the method further comprising opening the third and the fourth valves.
13. A method for loading an air conditioning system treatment into an applicator comprising a tubular reservoir, the method comprising:
- positioning the reservoir in a vertical orientation having an upper end above a lower end, the upper end open to the atmosphere and the lower end terminated in a lower end cap having a lower fitting therein;
- attaching a supply hose to the tower fitting;
- injecting treatment into the reservoir through the supply hose, during the injecting process air escapes through the upper end;
- detecting treatment leaving the upper end;
- closing the upper end by attaching an upper end cap thereto;
- removing the supply hose from the lower fitting; and
- attaching a tower fitting cap to the lower fitting.
14. The method of claim 13 wherein the upper end cap comprises an upper fitting open to the atmosphere and a transparent drain hose connected to the upper fitting, and wherein the step of detecting treatment leaving the upper end further comprises visually detecting treatment within the transparent drain hose.
15. The method of claim 13 wherein the upper end cap comprises upper fitting open to the atmosphere, and wherein the step of closing the upper end further comprises attaching a fitting cap to the upper fitting.
Type: Application
Filed: Dec 21, 2007
Publication Date: Jul 3, 2008
Inventors: John Dale Willis (Lakeland, FL), Ronald E. LeClair (Ft. Pierce, FL)
Application Number: 11/963,361
International Classification: F25B 45/00 (20060101); B65B 3/04 (20060101);