High and low pressure gas selector valve of refrigerator

Abstract

There are provided a housing that has a generally cylindrical-shaped internal circumferential surface, a housing passage that includes a high-pressure gas passage and a low-pressure gas passage which are formed on the housing surface, a generally cylindrical-shaped rotor that is supported by bearings, and which rotates with a micro-clearance away from the internal circumferential surface of the housing without touching the housing, and a rotor passage that is formed inside the rotor, and through which gas flows at the time its openings align with the valve housing passage. Load to the rotating axis of the rotor due to the pressure of the supplied gas to the valve is cancelled, and the clearance between the rotor and the housing are maintained at a proper level, by installing pluralities of high-pressure gas supply ports and low-pressure gas supply ports of the housing in symmetrical positions relative to the rotating axis of the rotor.

1 . A high-low pressure gas directional control valve of a refrigerator for changing-over periodically between a high-pressure gas and a low-pressure gas from a compressor comprising: 
 a housing having a generally cylindrical-shaped internal circumferential surface;    housing passages including high-pressure gas passages and low-pressure gas passages formed on a wall surface of said housing;    a generally cylindrical-shaped rotor being supported by bearings, and rotating with a micro-clearance away from said internal circumferential surface of said housing without touching said housing; and    a rotor passage formed inside said rotor, having gas flow through it at the time its openings align with said housing passage;    wherein said high-low pressure gas directional control valve of a refrigerator is characterized by having a plurality of high-pressure gas supply ports and a plurality of low-pressure gas supply ports of said housing installed each in a symmetrical position regarding a rotating axis of said rotor.    
     
     
         2 . The high-low pressure gas directional control valve of a refrigerator according to  claim 1 , characterized by having a low-pressure gas supply port of said housing in a same plane as said high-pressure gas supply port.  
     
     
         3 . The high-low pressure gas directional control valve of a refrigerator according to  claim 1  or  claim 2 , characterized in that the high-pressure gas or low-pressure gas flowing into said rotor passage is made to be supplied to said refrigerator through passages formed along a central axis of said rotor, and also formed on an edge face of said housing.  
     
     
         4 . The high-low pressure gas directional control valve of a refrigerator according to  claim 3 , characterized in that said passage formed along the central axis of said rotor is made to have openings on both end faces of said rotor.  
     
     
         5 . The high-low pressure gas directional control valve of a refrigerator according to any one of the  claims 1  to  4 , at least one of the housing and the rotor is provided with a slit to adjust timing.  
     
     
         6 . A refrigerator using the high-low pressure gas directional control valve of a refrigerator according to any one of the  claims 1  to  5 .  
     
     
         7 . A cryogenic device using the refrigerator according to  claim 6.