GB331176A - Improvements in and relating to rotary pumps - Google Patents

Abstract

331,176. British Thomson-Houston Co., Ltd., (Assignees of King, R. E.). Nov. 27, 1928, [Convention date]. Fixed-abutment type; mounting and supporting; discharge and suction pipes and passages for pumps; starting and stopping.-A pump for a compression refrigeration machine has a rotary casing 24 which is an extension of a vertical driving shaft 26 coupled to an electric motor 15, and an inner eccentrically placed rotor 27 which is driven by the casing through a connecting vane 49. The whole unit is mounted on springs 17 inside a chamber 13, leads 16 supplying current to the motor. Refrigerant is fed to the pump by way of a pipe 19 through a port 18 and a check valve 43, Fig. 5, and passes via a supply duct 41 in the base bearing 38 to a duct 40 which leads to pump inlet ports 39. The fluid is pumped through a check valve 45, Fig. 2, to a delivery port 20 and discharged into the chamber 13 whence it flows into the intake 21 of the condenser. The condensate passes out through a float valve 22 to a pipe 23. A bye-pass valve 73, Fig. 5, allows refrigerant to pass from the intake to the delivery side until the pump reaches a predetermined speed when centrifugal force causes the valve, which is arranged eccentrically, to close a port 70, and the pump then functions normally. This prevents the motor from being heavily loaded while running at a low speed. Ribs 75 are provided on the valve. The vane 49 acts as a pump for lubricating oil 65 which is drawn through a strainer 62<a> into a conduit 60 which supplies the vane pump chamber when open to 'a port 61. During the return stroke of the vane 49 the end of the conduit 60 is moving over a port 63 and lubricant is pumped through a passage 64 to channels which feed bearings 33 and 34, and also grooves 57 and 53 to seal the end faces of the main pump chamber to prevent leakage. A slot 66 supplies lubricant to the vane seating 51.