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  Liquid fuel supply unit for a liquid fuel burner and a liquid fuel burner systemUSPTO Application #: 20060147855Title: Liquid fuel supply unit for a liquid fuel burner and a liquid fuel burner system Abstract: A liquid fuel burner system and a liquid fuel supply unit (101) for the liquid fuel burner (106) of the system are disclosed. The supply unit (101) comprises a liquid fuel feed pump (102), a compressor (104 and preferably also a motor (30) mounted on a common drive shaft (3). The system further comprises a modulatable liquid fuel metering device (103). The liquid fuel feed pump (102) is connectable to a liquid fuel conduit from a liquid fuel source, such as an oil tank. An outlet of the feed pump (102) is connected to an inlet of the liquid fuel metering device (103), which in turn is connectable to an atomizing nozzle (105) of the liquid fuel burner (106). (end of abstract) Agent: Mccormick, Paulding & Huber LLP - Hartford, CT, US Inventors: Jorn Holger Klausen, Bent Kjeldal USPTO Applicaton #: 20060147855 - Class: 431018000 (USPTO) Related Patent Categories: Combustion, Timer, Programmer, Retarder Or Condition Responsive Control The Patent Description & Claims data below is from USPTO Patent Application 20060147855. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application is entitled to the benefit of and incorporates by reference essential subject matter disclosed in international Patent Application No. PCT/DK2003/000733 filed on Oct. 30, 2003 and Danish Patent Application No. PA 2002 01684 filed on Nov. 1, 2002. FIELD OF THE INVENTION [0002] The present invention relates to a liquid fuel supply unit for a liquid fuel burner and a liquid fuel burner system. Especially the invention relates to domestic heating the liquid fuel burner having a heat output of less than 10 kW. BACKGROUND OF THE INVENTION [0003] Liquid fuel burners, such as oil burners, are quite common for domestic use. Ordinarily such oil burners are of the oil pressure atomizing type having high-pressure pumps delivering oil at high pressure. These burners operate on the principle that when oil under pressure is permitted to expand through a small orifice, it tends to break into a spray of very fine droplets, which are suitable for combustion. These burners are usually designed to operate with oil pressure as high as 3 MPa and viscosities of from 2 cSt. The principle upon which these burners operate requires that the pressure drop across the orifice be maintained high and as nearly constant as possible in order to achieve the necessary fine atomized droplets and also to avoid pulsating combustion. Because it is not possible to maintain the required atomization at lower pressure drop and thus lower flow, modulation or regulation of the heat output, in the operation of such burners has traditionally been very severely limited or has not been used at all, and the burners have been operated in an on-off mode only. This results in inferior temperature control, lower boiler efficiency and increased thermal load of the components, as they will experience a lot of heating and cooling cycles. On-off regulation also has a detrimental impact on the environments due to the many start-ups during which the combustion of the fuel is not optimal. [0004] The minimum output of the burner is controlled by the size of the holes in the orifice. The smallest feasible holes are 0.1 mm in diameter, as smaller holes will clog very quickly due to inevitable particles in the oil or due to soot build-up from the combustion, increasing the need for maintenance to an intolerable level. The ordinary minimum output of oil burners having an orifice with the smallest holes possible, is about 10 kW, which exceeds the static demand of an ordinary household. [0005] One such oil burner is known from U.S. Pat. No. 5,692,680, which discloses a fuel supply unit for an oil burner. This fuel supply unit comprises a pump delivering pressurized fuel to a metering orifice, where the flow rate of fuel delivered can be regulated by regulating the pressure differential to maintain a constant flow independently of the elevation of the burner and the elevation of the tank with respect to the pumping unit. However, it is generally advantageous to have an adjustable flow rate of fuel to the burner, therefore this kind of supply unit is not desirable. [0006] It has also been proposed to use burners in which a liquid fuel is gasified prior to the supply to the burner. These burners, however, require a significant start-up time, as the fuel must be heated to gasification temperature prior to start-up of the burner, and this kind of burners are mainly used for large industrial burners. [0007] It has also been tried to operate liquid fuel burners on foamed liquid fuel. One such burner is disclosed in U.S. Pat. No. 5,051,090 wherein the liquid fuel is foamed in a foam collection cylinder. This kind of burner is, however, only suited for large industrial burners. [0008] EP-A-0 556 694 discloses a burner system for liquid fuel and provided for easy modulation to compensate for changes in fuel viscosity. The burner system thus comprises a gas atomizing nozzle fed by an air compressor and a fuel pump, the fuel being fed through a regulator regulating on basis of a pressure difference. [0009] U.S. Pat. No. 4,391,580 discloses a system for supplying fuel to a pressure atomization fuel oil burner nozzle comprising a rotating gear pump with a rotatable valving structure for delivering fuel at pressure pulses and at a rate depending on the rotational speed of the pump, the rate thus being controllable. The system further comprises a blower driven by the same motor as the pump. [0010] EP-A-0 013 488 discloses a unit comprising a fuel oil pump, a fan and a motor mounted on a common shaft and an electric circuit for controlling the unit. [0011] As oil and most other liquid fuels are fossil fuels and hence a scarce resource, care should be taken to exploit the fuel to the utmost. SUMMARY OF THE INVENTION [0012] The object of the present invention is to provide a liquid fuel burner system which when applied to a boiler of a domestic heating system allows substantially continuous, modulate operation at least during the heating season. [0013] A further object is to provide a unit for use in such a system. [0014] According to the invention a liquid fuel supply unit for a liquid fuel burner with a gas atomizing nozzle, the supply unit comprising a liquid fuel feed pump and a compressor, said liquid fuel feed pump having an inlet connectable to a liquid fuel conduit from a liquid fuel source, such as an oil tank, and an outlet connectable to an inlet of a liquid fuel metering device, said compressor having an outlet being connectable to the gas atomizing nozzle of the liquid fuel burner, is characterized in that the unit comprise a common drive shaft for the liquid fuel feed pump and the compressor. Hereby is obtained a unit which provides for low production costs and thus makes it feasible to provide a system according to the invention. [0015] Preferably the liquid fuel feed pump and the compressor both comprise a rotary impeller mounted on the common drive shaft. [0016] Also preferably the unit comprises a motor with a rotor connected to the common drive shaft. Preferably the motor is placed between the compressor and the liquid fuel feed pump. This provides for more maintenance friendly unit as the compressor and liquid fuel feed pump will be readily accessible. [0017] The common drive shaft may be one element or it may comprise more interconnected shaft elements, which will facilitate manufacturing. [0018] Further the unit may comprise a modulatable liquid fuel metering device, which may comprise a metering orifice and a valve. Alternatively the liquid fuel metering device is a metering pump, which may be a piston pump activated by an electro magnet. [0019] In a preferred embodiment the compressor is a vane pump and the liquid fuel feed pump may be a gerotor pump. [0020] A liquid fuel burner system according to the invention comprises a burner device with a gas atomizing burner nozzle, a fan for supplying combustion air to the burner device, and a liquid fuel supply unit, said unit being a constructional and exchangeable unit and comprising a liquid fuel feed pump and a compressor having a common drive shaft, the system further comprising a modulatable liquid fuel metering device fed by said liquid fuel feed pump, said gas atomizing burner nozzle being connected with the liquid fuel metering device and the compressor for receiving liquid fuel and atomising gas. Continue reading... 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