GB707216A - Improvements in hot-gas reciprocating engines and refrigerating engines operating onthe reversed hot-gas engine principle - Google Patents

Abstract

707.216. Refrigerating. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. May 6, 1949 [May 11, 1948], No. 12158/49. Class 29 [Also in Group XXVII] In a reciprocating refrigerating engine the amount of gas in the working space is varied by means of reservoirs 9, 10 under high and low pressure respectively, a valve 2 for connecting the reservoirs one at a time with the working space via a channel 15 being rotatable and slidable axially in a housing 1 and a helical channel 5 being provided in the valve adapted on axial movement of the valve to connect the reservoirs successively to the working space and a channel 6 being provided to vary the moment in the cycle when one of the reservoirs is cunnected with the working space. A hot gas engine is particularly. described. The valve 2 is rotated at the speed of the engine crank shaft by means of gears 17, 18 and slides axially in the gear 17. In the position of the valve shown the reservoir 9 is connected once during each revolution of the crank shaft to the channel 15, and the reservoir 9 communicates with the working space at the position of the crank shaft at which the working pressure is a minimum..The power thus supplied by the engine is a maximum. To reduce the power of the engine the valve 2 is moved downwardly so that the moment at which the reservoir communicates with the working space is changed thus giving a lower average pressure in the engine. When the valve has been displaced by the amount a, the reservoir 10 communicates with the working :space of the engine through a channel 8 and the channels 5, 6, and 15. Further displacement of the valve results in further reduction in power by changing the moment when the reservoir communicates with the working space. In order to maintain constant pressures in the reservoirs the reservoir 9 communicates by means of a reducing valve 11 with the reservoir 10 and the reservoir 10 communicates through a reducing valve 12 with a reservoir 13 which communicates with the reservoir 9 by a compressor 14. When an open regulating system is employed the space 13 may be dispensed with. A number of reservoirs of intermediate pressures may be arranged in series between the reservoirs 9, 13 each reservoir having a duct connecting it to the housing 1. Specification 697,082, [Group XXVII], is referred to.