Patent GB-193043-A (GB)
Title: Improvements in compression refrigerating machines
IPC: F25B1/04
Filed: 1923-02-07
Abstract: 193,043. Safety Car Heating & Lighting Co., (Assignees of Hulse, G. E.). Feb. 8, 1922, [Convention date]. Refrigerating, compression machines for.-A rotary compressor 42, surrounded by air-cooled condenser coils 67, 68 and a combined receiver and lubricant separator 70, is arranged in the upper part of a casing 19 containing an aircirculating fan 33 and an electric motor 35. The lower part 10 of the casing is formed with a sleeve portion 13 in which is mounted a lower ball-bearing 14, 15 adjustable axially by means of a screw-cap 17 locked in position by set screws 18. The motor-shaft 16 is connected at its upper end, as by a pin 29, to a sleeve 28 on which the fan 33 is secured by a nut 34, and an intermediate bearing 26 is provided in the central ring part 24 of a spider frame 23. A rectangular block 54 fast within the sleeve 28 engages the notched lower end 56 of the compressor shaft 52, to provide a driving connection allowing axial adjustment of the sleeve and intermediate bearing with that of the lower bearing. An expansible corrugated sleeve 58 enclosing the compressor shaft is secured to a fixed bushing 57 and carries at its lower end a metal ring 62 rubbing against the upper end of the rotating sleeve 28 to provide a fluid-tight joint for the shaft. An upper ballbearing 49 is accommodated in an extension 48 of the end wall 46 of the compressor. A disc 64 forced into a. groove in the wall of the sleeve 28 serves to prevent leakage of lubricant to the motor. The mixture of compressed gas and lubricant passes through a pipe 66 to the condenser coils, which are fitted with copper gills, and the condensed mixture flows through a pipe 69 into the receiver and separator vessel. This vessel is annular and is provided with a partition 71 adjacent the inlet pipe 69 to cause the mixture to flow round the vessel before it reaches the discharge pipes 75 for gas and 74 for lubricant. The refrigerant employed may be sulphur dioxide, and the lubricant may be petroleum oil of less specific gravity than the refrigerant. The lubricant flows from the pipe 74 through an apertured plug 74<a> at the top of the compressor. The fan draws air downwardly over the condenser coils and receiver vessel and discharges it through openings in the lower part of the casing. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the following subject-matter : The evaporator comprises a series of stamped cup-shaped members 76, Fig. 5 (Cancelled), having apertures 77 in their bases and arranged end to end within an enclosing tubo 75. Cooling liquids indirectly within casings or chambers.-The tube 75 is connected with a coil 78, Fig. 2 (Cancelled) adapted to cool water or other liquid supplied to a receptacle 80<a> from a bottle 86 and drawn off through a pipe 91 fitted with a tap. The coil 78 is embedded in lead 87 to form smooth surfaces contacting on the outside with a lining surrounded by insulation 81 and on the inside with the wall of the receptacle 80<a>. The pipe 91 is connected with a, draw-off fitting 80<b> which may be detached to facilitate cleaning of the receptacle. A thermostat chamber 88 containing a fluid such as ethyl chloride is located below the bottom of the receptacle, and is maintained in thermal contact therewith by a spring 93. This chamber is connected by a tube 89 to a pressure-actuated switch 90 controlling the circuit of the electric motor driving the compressor. This subject-matter does not appear in the Specification as accepted.