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 ).

1 . 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 and a motor, 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, wherein the unit comprises a unitary common drive shaft, the liquid fuel feed pump and the compressor both comprise a rotary impeller and the motor comprises a rotor where the rotary impellers and the rotor are mounted on the unitary common drive shaft for the liquid fuel feed pump and the compressor.  
   
   
       2 . The supply unit according to  claim 1 , wherein the liquid fuel feed pump and the compressor both comprise a rotary impeller mounted on the common drive shaft.  
   
   
       3 . The supply unit according to  claim 1 , comprising a motor with a rotor connected to the common drive shaft.  
   
   
       4 . The supply unit according to  claim 3 , wherein the motor is placed between the compressor and the liquid fuel feed pump.  
   
   
       5 . The supply unit according to  claim 1 , wherein the common drive shaft comprises interconnected shaft elements.  
   
   
       6 . The supply unit according to  claim 1 , comprising a modulatable liquid fuel metering device.  
   
   
       7 . The supply unit according to  claim 6 , wherein the liquid fuel metering device comprise comprises a metering orifice and a valve.  
   
   
       8 . The supply unit according to  claim 6 , wherein the liquid fuel metering device is a metering pump.  
   
   
       9 . The supply unit according to  claim 8 , wherein the metering pump is a piston pump activated by an electro magnet.  
   
   
       10 . The supply unit according to  claim 1 , wherein the compressor is a vane pump.  
   
   
       11 . The supply unit according to  claim 1 , wherein the liquid fuel feed pump is a gerotor pump.  
   
   
       12 . A liquid fuel burner system comprising 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.  
   
   
       13 . The liquid fuel burner system according to  claim 12 , wherein the burner device has a minimum heat output of less than 10 kW.