Patent GB-769983-A (GB)
Title: Improvements in or relating to pressure oil burners for heavy oil
Inventor: AKESSON IVAR WALDEMAR
IPC: F23D11/24
Filed: 1955-05-17
Abstract: 769,983. Spray burners. CHALMERS PRODUCTS AKTIEBOLAG. May 17, 1955, No. 14240/55. Class 75(1) In a pressure oil burner comprising an air pipe 4 supplied by a fan 3, a burner head arranged centrally in the front portion of the air pipe 4 and having a spraying nozzle 6 supplied with oil by a pump, and an oil.preheater 7 enclosed in the air pipe. the preheater 7 consists of an elongated annular chamber disposed centrally in the air pipe and supports the burner head at its front end, and an oil pipe 19 secured at its forward end to the spraying nozzle 6 and detachably secured at its rear end tu an oil outlet 16 in the preheater chamber is surrounded by and is withdrawable with the spraying nozzle 6 from the chamber. Oil is fed to the preheater chamber through a hole 14 in the end wall 8 of the air pipe 4 and through a pipe 15 opening into the front end of the chamber. The oil outlet 16 also is formed in the end wall 8 and has a spring-loaded ball 17. A coiled pipe 12 serving as a through flow channel for a heating medium or accommodating an electric heating element is disposed within the preheater chamber. The oil pipe 19 passes through. the central passage of the preheater chamber and supports the spraying nozzle 6 and an oil strainer 6<SP>1</SP> on its front end. Another oil pipe 20 is disposed within the oil pipe 19 and returns oil from the front. end of the pipe 19 if the temperature or pressure of the oil is below a predetermined operating value. The rear ends of the two oil pipes 19, 20 communicate with channels 26, 27 in a head 25 held by a hinged stirrup 31 and a clamp screw 30 against the outside of the end wall 8 so that the mouths of the channels 26, 27 seal against the oil outlet 16 from the preheater chamber and a hole 29 in the end wall 8 communicating with the suction side of the pump. A valve device 21 is located in the oil pipe 19 behind the spraying nozzle 6 and comprises a sleeve 40 connected to the front end of the return pipe 20 and a body member 41 displaceable in the sleeve by oil pressure and against the action of a compression spring 42 and co-operable with a seat 43 disposed around an oil inlet 44 to the spraying nozzle 6. The body member 41 also has a transverse bore 45 one end of which communicates in all positions of the body member with a hole 46 in the sleeve 40 while the other end communicates with a groove 47 in the inside surface of the sleeve when the body member is pushed far to the rear by excessive oil pressure, oil then flowing into the return pipe 20 to reduce the pressure. The transverse bore 45 also communicates with the return pipe 20 through a hole 48 in the body member controlled by a needle 22 extending through the return pipe 20 and attached at its rear end outside the removable head 25 to the armature 33 of an electromagnet comprising a solenoid 37 in a casing 36 secured to a tube 35 supported by the head 25. At starting the needle valve is open thus allowing the oil to return to the inlet side of the pump but when the temperature of the oil reaches a predetermined value a thermostat 13 in the oil preheater energizes the solenoid 37 and the needle moves forward against the action of a return spring 34 to close the hole 48 in the body member 41. Oil pressure then builds up at the valve device 21 and opens the inlet 44 to the spraying nozzle. The solenoid 37 is movable on the tube 35 in the rearward direction against the action of a compression spring 38 to enable the solenoid to follow the armature when the needle is forced rearwardly by the body member 41. The burner head comprises a tubular jacket 9 extending forwardly from the front wall of the preheater and having a constricted front portion and air holes. An air turbulator 5 is fitted around the jacket 9.