Abstract: A flame retention head for a nozzle block assembly of a waste oil-burning system, such as a furnace, having a combustion zone within which oil is burned in the presence of air utilizes a platen-like body of substantially circular form having a central opening through which an atomizing nozzle is positioned for directing air and oil into the combustion zone for burning. The central opening has a diameter of no less than about 1.3 inches, and the platen-like body including a plurality of radially-extending vanes formed therein wherein each vane forms with the remainder of the platen-like body a gap which is joined to and extends radially-outwardly of the central opening. Each gap formed by a vane has a width which is no less than about 0.07 inches. Associated with the nozzle block assembly is at least one air vane for balancing the air flow moving past the flame retention head and toward the combustion zone.

Abstract: A fuel control and preheating module for use with an oil-burning furnace including a fuel line providing a passageway section through which oil is routed from a reservoir to the furnace for burning includes an electrically-powered positive temperature coefficient (PTC) heating element mounted in heat transfer relationship with oil contained with the passageway section. During the operation of the PTC element, the PTC element heats the oil contained within the passageway section to a preselected temperature and maintains the oil contained within the passageway section at the preselected temperature. Also associated with the module is a movable diaphragm and shutoff plate which is responsive to the internal pressure changes in the air passageway of the furnace upon shutdown and start-up of the furnace to withdraw oil from and shut off delivery of oil to the nozzle upon furnace shutdown and to push oil toward the nozzle upon start-up of the furnace.

Abstract: An oil-burning furnace including a combustion zone, an air passageway through which air is routed to the combustion zone, an air compressor for moving the air through the combustion zone in a pressurized condition and an oil passageway through which oil is routed to the combustion zone for burning in the presence of air utilizes a shutoff assembly for positively shutting of the flow of oil through the fuel passageway upon shutdown of the furnace operation. The shutoff assembly is associated with the air passageway and is actuated in response to a drop in the pressure of air in the air passageway below a preselected level. Thus, the actuation of the shutoff means is coordinated with the de-energizing of the air compressor. In addition, the oil passageway is adapted to shut off the flow of oil at a location along the passageway which is disposed in relatively close proximity to the combustion zone.

Abstract: An oil-burning furnace including a combustion zone and a nozzle block assembly through which oil and pressurized air are introduced into the combustion zone utilizes an oil pump of trochoidal design for delivering oil to the combustion zone at a metered rate and a purge control for withdrawing oil from the nozzle block assembly upon shut down of the furnace operation. The flow rate at which the oil pump delivers the oil to the nozzle block assembly is relatively constant regardless of the weight or viscosity of the oil burned by the furnace, and the purge control cooperates with an air compressor used for delivering air, under pressure, to the nozzle block assembly and includes an expandable zone for extracting oil from the nozzle block assembly upon a de-energizing of the air compressor.

Abstract: A furnace including an elongated housing having an air intake adjacent one end of the housing and an air discharge vent adjacent the other end of the housing utilizes a substantially U-shaped heat exchanger positioned within the housing and a partition supported within the housing so as to separate the interior of the housing into first and second zones. A fuel burner assembly directs a flame and attending combustion products into one leg section of the heat exchanger so that the heat generated by the flame and combustion products are absorbed through the inside surfaces of both leg sections. The furnace also includes a fan so that a fraction of the air move through the first zone and absorbs heat from the outer surfaces of the one leg section and so that a remainder of the air moves through the second zone and absorbs heat from the other surfaces of the other leg section. The partition provides a first and a second opening through which the first and second zones communicate with one another.

Abstract: A forced-air furnace for burning gas or fuel oil or waste oil utilizes relatively few components and effectively heats air for space-heating purposes. The furnace includes a substantially enclosed, elongated housing having an air intake and an air discharge vent and a hollow elongated heat exchanger/combustion chamber which is supported within so as to extend axially along the housing. The furnace also includes a fuel burner assembly supported at the discharge end of the housing for directing a flame and attending combustion products directly into the heat exchanger so that the inner surface thereof absorbs heat generated thereby and so that no part of the flame impinges upon the heat exchanger. Heat transfer from the combustion products to the heat exchanger is enhanced by a pair of removable platen-like baffles mounted within the heat exchanger.

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: The specification discloses an oil combustion system for burning waste oil in which oil is pumped by an oil transfer pump from an oil reservoir through a bouyant swirling filter. The oil is supplied to a high pressure input of a pressure reducing fitting, and is transmitted through the fitting to a low pressure output and a high pressure output. A siphon nozzle head is operable to siphon the oil from the low pressure output of the fitting, to preheat the oil, to atomize the oil and to output the atomized oil. Retention chambers and heat transfer plugs within the nozzle head facilitate preheating of the oil and perform a baffle function.

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 portable heater comprising a housing composed of separate parts including a lower part having a bottom and side wall portions defining a trough, components of said heater including a combustion chamber assembly and a support, said support positioning in a sense transverse to said lower part, said combustion chamber assembly and said support having in connection therewith means for seating to and interfitting with means in connection with said side wall portions of said lower part in a drop fit thereof to said lower part, said support mounting thereon a motor and a fan blade assembly for powering said heater and developing therein a pressured flow of air to and about said combustion chamber assembly and means for delivering fuel and igniting the fuel in delivery thereof to the combustion chamber of said assembly, said interfitting means being constructed and arranged to position said combustion chamber assembly and said support and said fan blade assembly in a substantially direct alignment on and within sai

Abstract: A portable space heater features a tubular heat shield of generally uniform cross sectional configuration about and in longitudinally offset, concentric, closely spaced relation to a tubular shell defining its combustion chamber to project beyond a nose cone at its outlet end. The projection of the shield beyond the cone is limited to produce, upon a high velocity pressurized flow of air around the inner surface of and the length of the shield, distinctive flow of air within the projected end of the shield and about the nose cone the pattern of which produces an effective heat exchange with the products of combustion at the cone which substantially moderates the cone temperature.

Abstract: A thermostat controlled window furnace for heating a room features a construction wherein the air required for its operation is comprised on the one hand of outside air used solely for combustion purposes, to service a heat transfer component, and on the other hand of air drawn from the room, to be heated in passage through the heat transfer unit and returned to the room to elevate its temperature. The arrangement provided for inflow of room air insures that it will exhibit the general temperature of the room. The furnace not only provides for an effective separation therein of outside air and room air which is utilized thereby but for a return to the room of heated air in a manner to inhibit a chance or premature intermingling thereof with that portion of the room air being drawn into the furnace the function of which, in part, is to signal the general temperature of the room to a furnace thermostat.

Abstract: The space heater of the invention features an improved motor-transformer package which may be easily applied to and removed from the heater, as an integrated unit. The design and mount of this package makes it extremely easy to service and insures that in the placement and operation thereof the total package will be surrounded with an insulating flow of air, the cooling effect of which guarantees a longer and more useful operating life for the included components and related apparatus. In the preferred embodiment illustrated, the motor and transformer elements of the package are connected, in a superposed relation, to opposite sides of a mounting plate the design of which essentially dictates the required placement of the package in a heater housing.

Abstract: A compact, relatively midget sized, portable heater a stable base for which is provided by its fuel tank per se. The tank features a plug fit filter tube formed to facilitate the connection of a fuel supply line. Preferred embodiments of the heater are characterized by plate formed air deflector fins which are arranged to most effectively control the delivery of air to and about the discharge from a simply mounted and constructed fuel nozzle at the entrance to a combustion chamber. The illustrated embodiment shows the fins as included in a bracket-type support for the fuel discharge nozzle and on a deflector plate which defines the entrance to the combustion chamber to which it mounts. The relationship of parts enable the use of a minimal amount of energy for a given application.