Patent GB-215065-A (GB)
Title: Automatically-controlled pressure feed for liquid hydrocarbon burners
IPC: F23D11/44
Filed: 1923-01-30
Abstract: 215,065. Blanchard, G. N. Jan. 30, 1923. Liquid fuel snpply.-Liquid fuel is supplied from a reservoir 6, Fig. 20, to a burner 7 by means of a pump 26 operated by an electric motor having arranged in parallel in its supply circuit a laminated thermostat 123 and a make-andbreak device 90, 97 operated by the pressure in the fuel line 27, 28 between the pump and the burner. The motor shown comprises a core 59 movable within a solenoid 60 which is alternately energized and de-energized by making and breaking the supply circuit at contacts 103. The core is returned to its original position by a spring when the circuit is broken. When the room temperature is low the pump is operated even though the pressure in the fuel line separates the contacts 90, 97. When the room temperature is sufficiently high to operate the thermostat 123, the operation of the pump is controlled by the variation of pressure in the fuel line 27. The pump shown in Figs. 2, 10, and 18 consists of an expansible cylinder 46 fitted with inlet and outlet check valves 41, 42 and is mounted with its operating mechanism on a bed 4 supported by springs 5 on a plate 1. The bottom of the cylinder 46 is attached to a stud 49 on a member 50 which is moved vertically by a cam 53 on a rod 54 oscillated in ears 55 depending from the bed 4 by means of arms 56 connected to one end of the core 59. The other end of the core is attached to an arm 64 which is parallel to the arms 56 and extends from a rod 65 mounted in ears 66 below the bed 4. One of the contacts 103 is mounted on a spring finger 102 which engages a roller 105 on a crank 106 carried by a rod 107. When the circuit through the contacts 103 is completed the solenoid is energized and the core is then drawn within the solenoid. On reaching its end position the arm 64 engages a finger 109 extending from the rod 107 and separates the contacts 103. The core is then returned to its initial position by means of a spring 67 connect. ing a rod 68 extending from the arms 56 to a nut 69 on an adjustable screw 70 on the bed 4. The rod 107 is prevented from turning under the influence of the spring finger 102 to remake the circuit during the return movement of the core by a cam 110 on a rod 111 engaging an arcuate plate 114 on the rod 107. On the core regaining its initial position the rod 64 engages a finger 116 extending from the rod 111 and turns the cam 110 to allow the rod 107 to rotate and the circuit is again completed at the contacts 103. The reciprocation of the core 59 is rendered smooth by connecting the end 62 of the core by an arm 76 and link 75 to a piston 73 reciprocating in a cylinder 72. The piston 73 is formed with a relatively small bye-pass opening and the cylinder 72 is formed with vents closed against the inward passage of air by a spring- pressed check valve 78. The make-and-break device operated by the fuel delivery pressure comprises a post 90 and a spring contact finger 97 which carries an adjustable screw 99 bearing on the rod of a spring-pressed piston 86 arranged above a diaphragm 84 in a chamber 82 communicating with the fuel line 27. Filters 8, 9 comprising tubular cylinders 10 and filtering screens 20 plugged at one end are arranged in the pump suction and delivery pipes 25, 28. The filters are secured to upstanding flanges 2 on the plate 1.