Abstract: A flueless, low nitrogen oxides emissions, low carbon monoxide emissions space heater having a fuel chamber with a fuel inlet and a fuel distributor. The fuel inlet generates a swirling fuel flow within the fuel chamber. A primary air inlet generates a counter-swirling primary airflow with respect to the swirling fuel flow in a primary air chamber. The fuel distributor discharges the swirling fuel flow into the counter-swirling primary airflow thus forming a fuel/air mixture. An ignitor ignites the fuel/air mixture. A combustion chamber is sealably secured to and in communication with the primary air chamber. The combustion chamber wall has a plurality of secondary air supply holes. An intermediate shell surrounds the combustion chamber wall and forms a space between the intermediate shell and the combustion chamber wall. A secondary air inlet is in communication with the space between the intermediate shell and the combustion chamber wall. An outer protective shell surrounds the intermediate shell.

Abstract: In order to improve an apparatus for the evaporation of active ingredients such as pyrethrum or similar insecticides, air-improving, bactericidal, disinfecting and/or, for example, curing substances incorporated in cellular boards or other solid carrier materials, consisting of a housing in which there is provided a heating means which is arranged behind a housing window, and of a holding means for the exchangeable arrangement of an active ingredient carrier panel in front of the housing window in such a way that an evaporation apparatus which is independent from electrical energy can be achieved while maintaining high reliability in handling, it is proposed that a catalytic, merely glowing, that is flamelessly acting burner 4 with fuel tank 3 be arranged in the housing 1 having ventilation openings 13 at such a distance from the housing window 2 that the hot waste gases from the burner 4 flow through the housing window 2 and activate the active ingredients.

Abstract: A process and equipment for removing toxic and malodorous gases from the fresh air for vehicle cabins by catalytic oxidation, the process being based on passing the fresh air over a heating-system heat exchanger, the heat-emitting surfaces of which form the support for an oxidation catalyst. The heat exchanger used is the heating-system heat exchanger which is present in virtually all motor vehicles. In contrast to known solutions for purifying the fresh air, for example by means of activated carbon, the process is maintenance-free and does not require any additional constructional volume.

Abstract: An oven (20) includes an oven enclosure (24) having a conveyor (40) mounted therein for transporting food products through the oven. A plurality of ribbon burners (100) are mounted within the oven interior (32) adjacent the path of the conveyor to heat the interior of the oven. Heated gases generated by operation of the ribbon burners are received through inlet plenums (140) under operation of a circulation fan (146) and are discharged through discharge tubes (154) extending adjacent portions of the conveyor (40) remote from the locations of the ribbon burners (100). Exhaust gases are removed from the oven interior through discharge ports (180) by exhaust blower assemblies (184) which are operated to remove exhaust gases from the oven interior at a rate proportional to the flow rate of combustion air and gaseous fuel into the ribbon burners.

Abstract: This invention relates to a burner with low emission of polluting gases, comprising, in a conduit, an injector of fluid fuel which creates in the conduit, supplied with combustion-supporting air heated in an exchanger, a fuel/air mixture. The latter burns, creating a flame which clings to a stabilizer constituted for example by a hollow piece, of V-section, obturating a central part of the cross-section of the conduit. Downstream of this stabilizer there is placed an obstacle causing a local reduction follwed by a sudden increase in the cross-section of the conduit in order to promote oxidation of the carbon monoxide.

Abstract: A heating and cooling system for improving the environment in buildings having a large open area, such as poultry buildings, utilizes an electronic ignition to control the temperature and humidity environment. The electronic ignition controls, in a pulsating fashion, the flow of gas feeding a pilot and burner and electrical powwer feeding electro-mechanical relays powering an assortment of blower, circulating fans, as well as a water pump used to distribute water to a water misting cooling arrangement coupled to a main blower and circulating fans to aid in cooling a building. The system includes a set of emergency cooling fans, thermal shut-down switch activates an alarm device to assure a safe and controlled environment in the building.

Abstract: A burner for placement in an airstream that flows in a downstream direction comprising a gas pipe having fuel ports for admitting fuel gas into the airstream, a flame retainer for preventing a flame originating at the manifold from lifting off the fuel ports and moving down the airstream, and a flame shield extending from opposite sides of the gas pipe and away from the gas jet for shielding the flame base from the airstream. The flame shield has a baffle assembly disposed on opposite sides of the gas pipe for forming an air passage for directing a portion of the airstream to flow along the downstream surfaces of the flame shield and flame retainer. In one embodiment of the burner, the baffle assembly directs a first portion of the airstream to flow along the downstream surface of the flame shield toward the flame retainer and directs a second portion of the airstream to flow along the downstream surface of the flame shield and away from the flame retainer.

Abstract: An apparatus for mixing a gas main flow with at least one gas subflow comprises a round inlet region which tapers in the flow direction and over the periphery of which influx openings are distributed for the gas subflow. From these influx openings the gas subflow emerges with a tangential direction component, giving a good mixing with the gas main flow.

Abstract: In order to improve an apparatus for the evaporation of active ingredients such as pyrethrum or similar insecticides, air-improving, bactericidal, disinfecting and/or, for example, curing substances incorporated in cellular boards or other solid carrier materials, consisting of a housing in which there is provided a heating means which is arranged behind a housing window, and of a holding means for the exchangeable arrangement of an active ingredient carrier panel in front of the housing window in such a way that an evaporation apparatus which is independent from electrical energy can be achieved while maintaining high reliability in handling, it is proposed that a catalytic, merely glowing, that is flamelessly acting burner 4 with fuel tank 3 be arranged in the housing 1 having ventilation openings 13 at such a distance from the housing window 2 that the hot waste gases from the burner 4 flow through the housing window 2 and activate the active ingredients.

Abstract: A motor vehicle door lock defroster attachment is disclosed for use in defrosting frozen door linkage mechanisms. The device includes a flexible radially corrogated tube having an attachment end shaped to engage the nozzle of a portable gas torch and a tapered discharge end positionable within the elongated space defined by the vehicle's door and door jamb. When the attachment end has been connected to the torch nozzle and the discharge end positioned in the door space in the vicinity of the frozen door linkage mechanism, heated air will move through the tube and out the discharge end thereby warming and defrosting the frozen mechanism.

Abstract: There is disclosed an environmental control system for a large volume structure (one horizontal dimension of at least 60 feet) having an air tempering unit including a horizontal cylindrical duct of about three feet diameter with an axial flow propeller fan and motor placed in one end to draw air through the duct and a gaseous fuel burner upstream from the fan with oxygen supplied from the air stream and with combustion products thereof being propelled through the fan. A series of propeller-fan air movers are placed in the structure near ceiling level with the first of the air movers placed about 25 to 50 feet in front of the air tempering unit. The air tempering unit and the air movers are operated by a control unit in response to a cycle timer and various sensor elements including an air velocity sensor for outside air supplied to the air tempering unit and an internal air temperature sensor.

Abstract: A duct burner apparatus and method for burning a gaseous fuel in the presence of a flowing oxygen-containing gas stream is provided. The apparatus comprises fuel gas supply means positioned in the path of the oxygen-containing gas stream and at least one elongated baffle means spaced from the conduit means on the downstream side thereof. The baffle means includes an inner wall portion and diverging outer wing portions and defines an ignition zone which is shielded from the conduit means. Spacer means for supporting the baffle means are attached thereto and to the conduit means, and fuel gas nozzle means are removably connected to the conduit means which extend to the baffle means for introducing fuel gas into the ignition zone and downstream thereof.

Abstract: A hot blow generating device utilizing a liquefied gas as a heat source comprises fuel gas jetting means, air/fuel gas mixture forming means by the ejector effect of the jetting fuel gas, catalytic combustion means formed with a plurality of linear axial gas flow channels, hot blow discharging means, and means for forcively supplying an air stream at least partially to said air/fuel gas mixture forming means depending on the combustion temperature in the device. A hot blow at a great flow rate can be obtained in a structure small in the size and reduced in the weight, safely and conveniently.

Abstract: An oven (20) includes an oven enclosure (24) having a conveyor (40) mounted therein for transporting food products through the oven. A plurality of ribbon burners (100) are mounted within the oven interior (32) adjacent the path of the conveyor to heat the interior of the oven. Heated gases generated by operation of the ribbon burners are received through inlet plenums (140) under operation of a circulation fan (146) and are discharged through discharge tubes (154) extending adajcent portions of the conveyor (40) remote from the locations of the ribbon burners (100). Exhaust gases are removed from the oven interior through discharge ports (180) by exhaust blower assemblies (184) which are operated to remove exhaust gases from the oven interior at a rate proportional to the flow rate of combustion air and gaseous fuel into the ribbon burners.

Abstract: An apparatus for in-process removal of built-up paraffin and the like from the inner surface of oil pipelines and the like has a combustion section and a heat transfer section. The combustion section includes an air heater, a blower for causing air to flow through the heater and through a heat transfer section, and a conduit for recirculating air from the heat transfer section to the combustion section. The heat transfer section includes a heater shell, and, disposed therewithin, a heat transfer tubing coil connected in an oil pipeline, upstream of built-up material to be removed, oil in the pipeline, being caused to flow through the coil. Heated air from the combustion section flows across the coil in the heater shell in a manner for transfer of heat from the air to the coil and to the oil flowing therewithin, whereby the temperature of the oil in the coil is raised to a predetermined temperature to liquify material built-up on the inner surface of the pipeline and the like to flow with the oil.

Abstract: An intermediate housing that is, preferably, developed as a cast part and combines several functions and objectives in itself. The intermediate housing not only houses a driving motor for a combustion air blower and a heating air fan, but the driving motor is also disposed by means of a circumferential support developed in the intermediate housing which, at the same time, serves as a stop during the mounting. By means of an elastic bearing of the driving motor, structure-born noise transmission can be avoided. On one side, a combustion air intake connection piece, a fuel supply pipe receiving opening and an exhaust gas outlet connection piece are integrally formed. For the mounting of the heater at a mounting arrangement, the intermediate housing also has passages for fastening screws that are accessible from the direction of the top side of the heater.

Abstract: A high temperature furnace including a furnace chamber maintained at an internal temperature above the ignition temperature of a gas mixture used for the growth of oxide layers on silicon substrates therein. A separate burn chamber is used to mix and burn the gas mixture. A tube conveys the mixture into the furnace chamber so that ignition of the gas mixture in the furnace chamber creates a flame front that travels back along the tube to the burn chamber to sustain ignition therein.

Abstract: A direct-fired make-up furnace comprises a cabinet which houses an air blower. A gas fired burner located in a sloped passage, which is formed by walls of a return air compartment and a by-pass air compartment, radiates heat at an angle relative to the blower. The return air compartment substantially blocks direct radiation of the burner. An exit opening of the by-pass air compartment is located between the burner and the blower.

Abstract: A forced air heater (10) includes a removable burner module (26) in which all of the burner components are mounted on a common support plate (42) to facilitate mounting of the burner module in the heater and removal of the burner module from the heater for servicing. An elongated burner tube (46) has a closed flattened end (50) receivable in a location-and-orienting bracket (76) to locate a single burner orifice (52) in a sidewall of the tube in proper position with respect to a pancake flame-spreader plate (78). A gas valve (44) and ignition device (58) also form part of the burner module 26. A combustion chamber (24) is of essentially box-shaped construction, with one open end (36), and includes an inclined baffle plate (40) which enhances mixing of combustion products and intake air in the chamber. A forced air blower (28) is mounted adjacent a heated air discharge opening (36b) of the combustion chamber (24).

Abstract: An atmospheric gas burner assembly comprises a burner tube defining a multiplicity of gas outlet ports and an element reducing the flame temperature and, hence, the emission of oxides of nitrogen disposed above the burner tube in the flame area. To optimize the reduction of NO.sub.x emission without affecting permitted CO values and to render the values of reduction in NO.sub.x emissions largely independent of the geometry of the surrounding combustion chamber so as to obtain reproducible emission reduction values, the reducing element is constituted by a multiplicity of fins confining the flames in shafts extending therebetween, the fins extending perpendicularly above the tube and being distributed along the tube.

Abstract: Pollination of alfalfa enhanced by flying a helicopter over a field of alfalfa with propane burners mounted on the helicopter and directed to heat air in vicinity of alfalfa blossoms. Heat causes blossoms to open and agitation by downdraft enhances spread of pollen through field to increase pollination and seed yield.

Abstract: It is provided as shown in the drawing with a waste gas guiding duct, a rotating duct, an inserting duct, a connecting duct, a stationary duct, and a branch tube including a feed chute and a gas exhaust duct, and is adapted to preheat a main raw material consisting of direct reduced iron or small lumps of pig iron, or of auxiliary raw materials consisting of ferro-alloy and quick lime by utilizing the waste heat of a waste gas generated in a steel making furnace, weighing the total raw materials, and charging these raw materials into the electric furnace. This enables the energy to be utilized efficiently, and the quality and productivity to be improved.

Abstract: A portable gas-fired forced-draft heater has a burner assembly mounted in a tube coupled to the intake port of a motor-driven blower. The burner operates in a stream of high velocity air which flows past the burner to the blower. The burner includes shrouds which cooperate with a fuel and air mixing nozzle to enable fuel to be burned efficiently and reliably over a wide range of fuel flow rates to the burner. A flame stabilization surface is spaced appropriately from the nozzle to enable reliable ignition of the fuel-air mixture. A controlled portion of the warm gases passing through the blower is routed to a receptacle for a fuel container to maintain pressure in the container as the preferably liquefied gas fuel is consumed during operation of the heater.

Abstract: The hot air generator according to the present invention comprises a vertical cylindrical enclosure whose walls are covered on the inside with refractory brick, the heating burner being placed at the top of the enclosure and the hot air exhaust orifice being situated at the base thereof, and in which the source of air by which it is fed is divided into three distinct flows: a first flow constituting the combustion air from the burner; a second flow constituting a first current of dilution air cylindrically surrounding the flame; a third flow constituting a second current of dilution air insufflated at the base of the enclosure so that the enclosure comprises three temperature zones: a first temperature zone which is that of the flame and is on the order of 1,800.degree.; a second temperature zone downstream of the flame and on the order of 900.degree.; a third temperature zone which is that of the second dilution current mixes with the flux of hot air which is comprised between 850.degree. and 300.degree..

Abstract: A combustion chamber for supplying heated air to a commercial dryer utilizes a back-mounted burner firing through coaxial cylinders of different diameters contained in the combustion chamber to heat air drawn through the larger cylinder. Additional fresh air in a secondary passage alongside the larger cylinder is selectively controlled to reduce the temperature of air flowing through the cylinder for the protection of the laundry articles in the dryer.

Abstract: A method and apparatus for improved preheating and/or curing of the channel of an induction furnace wherein an elongated burner tube is provided with a combustion zone adjacent its forwardmost end and an air inlet is provided adjacent its opposite end outside of the furnace to provide high velocity and high volume air flow to cool the burner tube extending within the furnace and support combustion within the burner combustion zone.

Abstract: An apparatus for heating air wherein the combustion is dispersed in direct proximity to a metal hydride fuel storage means in order that the combustion heat effects the release of hydrogen from the metal hydride. The combustion area contains a catalyst and a semipermeable membrane separates the hydride fuel storage means and the combustion area. The temperature of the metal hydride is raised to effect initial release of hydrogen which passes through the semipermeable membrane, mixes with air and is combusted at the catalyst. The heat of combustion, in direct proximity to the metal hydride, perpetuates the hydrogen release.

Abstract: There is disclosed an environmental control system for a large volume structure (one horizontal dimension of at least 60 feet) having an air tempering unit including a horizontal cylindrical duct of about three feet diameter with an axial flow propellor fan and motor placed in one end to draw air through the duct and a gaseous fuel burner upstream from the fan with oxygen supplied from the air stream and with combustion products thereof being propelled through the fan. A series of propeller-fan air movers are placed in the structure near ceiling level with the first of the air movers placed about 25 to 50 feet in front of the air tempering unit. The air tempering unit and the air movers are operated by a control unit in response to a cycle timer and various sensor elements including an air velocity sensor for outside air supplied to the air tempering unit and an internal air temperature sensor.

Abstract: An apparatus and method are provided for heating an air stream flowing through a conduit which minimizes the introduction of noxious burner exhaust emissions into the air stream. The apparatus utilizes a refractory radiant-type burner disposed within the air stream which includes means for supplying a combustible fuel to the burner and means for igniting the combustible fuel within the burner. The apparatus also includes means for removing the hot products of combustion from the burner and venting these products to the outside atmosphere until the temperature of the burner reaches steady state operating conditions. When steady state operating conditions are reached, a damper means on the burner opens and directs the products of combustion into the air stream to heat the air stream. When the burner is turned off, the damper means closes and directs the products of combustion to the outside atmosphere.

Abstract: The improved burner unit of the present invention is designed for use in relatively lower oxygen and/or lower pressure drop environments. The improved burner unit of the present invention comprises a burner base disposed at the bottom of the burner trough. A pair of mixing plates having aeration openings therein are attached on opposite sides of the burner base. The mixing plates include a lower flange for attachment to the burner base and a mixing plate body extending upwardly from such lower flange. The mixing plate body forms the sides of the burner trough and includes an outwardly protruding bulge at the center of the mixing plate. The burner unit also includes side flanges disposed on and extending from the sides of the mixing plate for engagement with like side flanges on like mixing plates to form a burner of the desired length. In preferred embodiments, the bulge in the side of the mixing plate body is generally parabolic in shape as viewed from the trough of the burner.

Abstract: A direct air heater using the air to be heated as combustion air includes means for maintaining a constant flow of air across the burner. The heater also includes means for recirculating inside air and means for controlling the flow of inside air, preferably, to maintain a constant pressure in the space being heated.

Abstract: A gas heated direct fired center tube revolving ironer for use in an automated fabric ironing environment features improved roller surface temperature distribution control. An adjustable hot air recirculation system with a venturi throat, a high momentum gas burner, an improved temperature control system and an exhaust blower cooperate to provide an even temperature along the ironing surface. Multiple high and low temperature controls provide backup and ensure accuracy and safety. The gas fuel consumption is minimized thereby reducing operating costs.

Abstract: A heat recuperator and a method for recuperating heat from a furnace having a nozzle-mix burner to enhance the efficiency of combustion of one or more burners associated with the furnace. The recuperator comprises an exhaust tube which is connectable to a furnace combustion chamber for receiving heated exhaust gas therethrough. The exhaust tube has an outer cylindrical wall and an inner metallic tube concentrically supported therein. An annular space is defined between the outer cylindrical wall and the inner tube. The inner tube is formed, in at least a major length thereof, with a plurality of corrugations. An air inlet connection is provided at an inlet end of the annular space downstream of the exhaust tube. The annular space also has an outlet upstream of the exhaust tube adjacent an inlet end thereof and connectable to a burner supplying same with heated combustion air.

Abstract: A portable hair drying apparatus has a tubular body (60) with an air inlet at one end also containing an electric motor driving impeller (73) and powered by rechargeable cells (74). The air flows over a gas burner assembly (61) fed with gas from a liquid gas container (78) via valve means (69). The container (78) may be recharged through valve (69) or detached at a coupling joint (79) and replaced. The gas burner (61) may comprise a tube surrounded by a catalyst impregnated fibre forming a flameless catalytic gas burner. The gas burner may be separated from direct contact with the air flow by means of a heat pump, one end of which is heated by the burner with the other end being located in the air flow.

Abstract: A heating device including a flame burner (40) and a nozzle (52) into which the flame (50) from the burner (40) is directed and in which process air is mixed with products of combustion from the flame; the nozzle (52) having hot gas discharge openings (106) through which the hot gases resulting from the mixing action are projected onto articles (10) or other material to be heated.

Abstract: A device for heating the bitumen layer of rolled roofing material in such a way that said layer becomes soft and sticky enough to adhere to the surface to be covered without burning said layer, comprising a distributing pipe (19) with many small closely distributed burner nozzles (20) for a combustible gas placed inside an elongated boxlike casing (9). The burner nozzles (20) form a row (10) inside the casing which is open at the front and rear. The plates (13, 14) and its width is considerably greater than its height while its length is considerably greater than its width. The distributing pipe (19) runs between the gable plates (13, 14) and is so positioned between and parallel to the top and the bottom plates that air slits (21, 22) are formed between the pipe and the top (11) and bottom (12) plates, respectively, said slits admitting air from the rear (17) of the casing to the nozzles (20).

Abstract: A portable LP gas heater includes a combustion chamber the discharge end of which is open and unobstructed and the inlet end of which is defined by a rear head plate having a central primary air inlet into which projects, to a limited degree, a cylindrical fuel nozzle. The projected extremity of the nozzle which positions within the combustion chamber mounts a transversely disposed baffle which is parallel to and spaced preferably about one inch from the rear head plate. Fuel exits from and about the nozzle immediately adjacent and upstream of the baffle. The baffle has a size which permits it to be introduced to and removed from the combustion chamber by way of the primary air inlet. The rear head is further distinguished by a single group of apertures located adjacent its outer periphery in a substantially ring-like pattern.

Abstract: A burner for gaseous fuels has a combustion zone of elongate cross section which is defined between divergent flame-confining walls. Each wall comprises a plurality of wall elements which are arranged edge to edge, the adjacent edges being relatively movable and mounted so as to prevent significant gas flow therebetween, the wall elements being rigidly secured to the remainder of the burner only at locations which are upstream of the combustion zone.

Abstract: A gas-fired infrared heater for projecting an infrared beam in a radiation pattern having a predetermined geometry for irradiating the surface of a food product or other body to effect uniform heating thereof at a rapid rate. The heater includes a ribbon-type burner having an elongated pre-mix casing into which is fed air and gas, and an outlet extending along a slot in the casing and projecting therefrom. The outlet is provided with two sets of corrugated ribbons separated by a gas pressure chamber, whereby the air-gas mixture from the casing passes through one set into the chamber where the pressure thereof is equalized before the mixture passes through the other set from which it emerges as a sheet of flame of uniform intensity. The outlet is inserted in the longitudinal socket of a refractory body to impinge on a surface thereof whereby the surface is heated to a temperature level causing the surface to emit infrared energy which is projected by an array of radiation horns formed in the assembly.

Abstract: A solvent reducing oven wherein stock that includes solvent is conveyed through an oven housing from which the solvent vapors are ducted and propelled into the side of the burner at an acute angle of about 60 degrees plus or minus 5 degrees to the burner axis. The solvent vapors are thereby combusted and the heated gases resulting being mixed with regulated quantities of air and propelled back into the oven for further solvent evaporation.

Abstract: A burner for heating air flowing in a passage in which the burner is disposed comprises a tube connected to the gas supply. The tube has mixing plates with flow apertures for the air secured to it to diverge from each other conically in the direction of air flow and is provided with gas outlet apertures between the mixing plates. The burner also comprises ignition means for the gas. The tube is in the form of a circular annulus and has gas outlet apertures in circumferential directions. The mixing plates consist of an outer conically diverging and an inner conically converging annular plate, the plates being at least partially bounded over their axial length by an air guide plate which converges conically in the direction of air flow and which is secured to the wall of the air passage for axial displacement. The ignition means are disposed in front of the gas outlet apertures which are arranged on a circle or a plurality of concentric circles.

Abstract: A web dryer for upper and lower stretches of horizontally extending lengthwise moving web, having stacked air bar assemblies of the compact type, has a single burner for supplying hot gases to the two air bar assemblies that are between the stretches. The burner projects into an inlet section of a T-shaped duct, which has branches terminating at a pair of outlets, each opening to, but spaced from, the air inlet of the blower for one of said two assemblies. A deflector plate in the inlet section of the T-shaped duct, swingable about an upright axis at the downstream end of that section, apportions burner combustion products between the branches. The burner is controlled by a thermostat in the header of the lower of said two assemblies, the deflector plate by a thermostat in the header of the upper of said two assemblies.

Abstract: A large scale, industrial system and method for dehydrating fruits, nuts or other produce. The system includes two long air tunnels which are placed end-to-end. Each air tunnel has a conveyor which is used to transport the produce through the air tunnel. As the produce exits one air tunnel, it is dropped from one conveyor onto the other, thus permitting the produce to be turned over before it enters the second air tunnel. Each air tunnel is divided into a number of separate air chambers in which the heated, circulating air is confined so as to reduce heat loss, thus increasing the energy efficiency of the system, and also providing for separate control of the air temperature and humidity levels in each air chamber. Countercirculation of air between adjacent air chambers aids in confining the air through the separate air chambers, as well as the use of resilient flaps which are used to enclose the ends of each air chamber through which the conveyor enters and exits.

Abstract: The invention concerns an apparatus for producing a hot gas to shrink plastic foils, with at least one burner mounted in a housing provided with a discharge nozzle for the hot gas. To better control the hot-gas temperature and hence the temperature of shrinking, the apparatus is provided with such a burner arrangement that the hot-gas jet (9 or 10) leaving the burner (7 or 8) is directed at an angle to the discharge flow defined by the discharge nozzle (6) and with a jet-deflection means for the hot-gas jet (9 or 10) before the discharge nozzle (6).In a preferred embodiment the jet deflection is implemented by a jet (17) of cold air by means of which the hot-gas jet (9 or 10) is simultaneously directed and cooled. In a preferred mode, the pressure and the flow rate of the cold-air jet (17) are controlled.

Abstract: In a combustion type heater for an automotive room heating system including a box-like casing which accommodates a combustor, an air blower for feeding air to the combustor, a fuel pump for feeding fuel to the combustor, a heat exchanger, etc., an outside air inlet port is formed in that portion of at least one side wall of the casing which is adjacent to the fuel pump. Air taken in through the outside air inlet port is caused to flow toward the fuel pump to cool it.

Abstract: A heater for heating gases such as turbine exhaust gases to facilitate the extraction of the heat energy carried by such gases or flue gases to reduce their corrosiveness. The heater is defined by burners installed on walls of the duct through which the gases flow. The burner can be operated with heavy fuel oil and normally uses no more primary air than is necessary to ignite the fuel oil atomized by the burner and sustain a flame. The flame is relatively long and narrow and is directed transversely to the gas flow into the duct. Upstream of the burner is a shield to protect the flame from the gas flow. The shield communicates with a register which collects an amount of gas sufficient to provide the balance of the combustion oxygen to fully combust all fuel. From the register the gas flows along inclined passages to the side of the shield facing the flame, the passages directing the gas in the direction of the flame and at an oblique angle in regard thereto.

Abstract: The method and apparatus sucks the entire combustion air volume in laterally with respect to the direction of flow of the air current with the help of the impulse of a fuel gas jet out of the air current into a mixing pipe and the formation of a differential pressure between the mixing pipe input and the waste gas output into the air current is prevented with the help of current guidance sheet metal pieces. The burner is arranged in a shaft-like housing, the fuel gas nozzle and the lower part of mixing pipe are surrounded by a pot-shaped current guidance sheet metal piece. A cylindrical current guidance sheet metal piece adjoins the cooled burner plate. The burner which, for example, can be used in dryers, for heating room air with so-called make-up air units and in gas water heaters, operates completely independently of the air flowing around it in a wide heat load range, without any change in the air coefficient. Because of the super-stoichiometric premixing of the burning gas with the air, the NO.sub.

Abstract: A heater including a generally cylindrical shell defining its housing arranged in a very closely spaced relation to the outer periphery of its combustion chamber assembly and its fan device as it bounds a plenum chamber therebetween. The combustion chamber assembly has its discharge end adjacent the discharge end of the shell. The relative configuration of the outer peripheral surface of the combustion chamber assembly and that of the discharge end portion of the shell creates therebetween a passage through which the fan device, on energization thereof, produces a very high velocity flow of a thin layer of air which, on discharge, is throttled and abruptly and sharply driven into the center of the flow from the assembly. The effect of this is to moderate and influence a relative uniformity of the temperature of the discharge and rapidly project it outwardly of and considerably beyond the heater.

Abstract: A gas-fired infrared heater for projecting an infrared beam in a radiation pattern having a predetermined geometry for irradiating the surface of a food product or other body to effect uniform heating thereof at a rapid rate. The heater is constituted by a refractory assembly formed by a stack of identical slabs having a bore therethrough to receive the cylinder of a controllable ribbon-type gas-air burner from whose longitudinal slot is emitted a sheet of flame. Each slab is provided with a sector-shape channel cut in one face thereof to define a fin and side walls that diverge from the bore to create a flattened IR radiation horn whose mouth is aligned with the burner slot, whereby the surface of the assembly on which the flame impinges is heated to a temperature level causing this surface to emit infrared energy. The parallel array of radiation horns created by the assembly produces a radiation pattern whose shape depends on the geometry of the channel.

Abstract: A recirculation device for recirculating a selected volume of preheated gas exhausted from a heating chamber in a mixture with fresh air back to the heating chamber. The device comprises a first passageway having an entrance and a pair of exits; a second passageway having a pair of inlets and an outlet; and a third passageway connecting one exit and one inlet. The other exit communicates with a preheated gas exhaust, and the other intake communicates with a source of fresh air. A back pressure damper is secured adjacent the other exit. A manual control assembly is connected to the back pressure damper so that the volume of preheated gas flowing into the preheated gas exhaust may be selectively determined. A mixing damper is secured adjacent the other intake. An automatic temperature dependent control assembly is connected to the mixing damper so that the mixture of preheated gas and fresh air entering the heating chamber is dependent upon the temperature in the heating chamber.