A multistage wave rotor refrigerator

Abstract

It is a kind of multistage wave rotor refrigerator which could be used in the field of gas expansion refrigeration. The refrigerator is mainly composed of a casing, a left end cover, a right end cover, a wave rotor, a central shaft, a high pressure inlet nozzle, a medium pressure outlet nozzle and a drive mechanism. Within the structure of the refrigerator, 2-8 times unsteady expansion of gas could get realized, which improves the refrigeration efficiency under large pressure ratio. Extending the structure of the refrigerator and changing the structure of end cover could help realize multistage expansion refrigeration of gas. The double opening structure of oscillation tubes could help the refrigerator work regularly with high moisture content of gas. This refrigerator is a gas expansion refrigeration device that uses moving unsteady pressure waves in oscillation tubes to realize the separation of the heat and cold of gas. Improvement of refrigeration efficiency could be done by recycling expansion work in the form of pressure energy that formed by expansion of high pressure gas.

We claim: 
     
         1 . A multistage wave rotor refrigerator includes a casing ( 20 ), a left end cover ( 19 ) and a right end cover ( 25 ); The characteristics of the refrigerator include a wave rotor ( 5 ), a central shaft ( 28 ), high pressure inlet nozzles, medium pressure outlet nozzles and a drive mechanism; The wave rotor ( 5 ) is fixed on the circular disk ( 28   a ) of central shaft ( 28 ) through bolts ( 27 ); The wave rotor ( 5 ) is placed in the casing ( 20 ) whose left side is set with the left end cover ( 19 ) and right side the right end cover ( 25 ); Between the left end cover ( 19 ) and the left side of central shaft ( 28 ) there are two bearings ( 17 ) behave as support; Another two bearings ( 17 ) behave as support between the right end cover ( 25 ) and the right side of central shaft ( 28 ); Oscillation tubes ( 6 ) with constant cross-section are set in the wave rotor ( 5 ) in circumferential direction; On the left end cover ( 19 ) there are first high pressure inlet chamber of 2-8 stages, second low temperature outlet chamber of 2-8 stages, second high pressure inlet chamber of 2-8 stages and first low temperature outlet chamber of 2-8 stages in order; On the right end cover ( 25 ) there are second medium pressure outlet chamber of 2-8 stages, first low pressure inlet chamber of 2-8 stages, medium pressure outlet chamber of 2-8 stages and second low pressure inlet chamber of 2-8 stages in order; The high pressure inlet nozzles of 2-8 stages are fixed on the left end cover ( 19 ) by bolts, and the medium pressure outlet nozzles of 2-8 stages on the right end cover ( 25 ); the circumferential central line of high pressure inlet nozzles and medium pressure outlet nozzles is the same as the circumferential central line of end faces of oscillation tubes ( 6 ); the clearance fitting between stationary nozzles surface plane and rotary wave rotor ( 5 ) surface plane needs to be controlled; the drive mechanism is an electromotor ( 22 ) that drives the wave rotor ( 5 ) on the central shaft ( 28 ) to rotate in the casing ( 20 ) through a coupling ( 23 ). 
     
     
         2 . According to the  claim 1  about the multistage wave rotor refrigerator, the characteristics include that as for two-stage wave rotor refrigerator, on the left end cover ( 19 ) there are a first high pressure inlet chamber of two stages ( 18 ), a second low temperature outlet chamber of two stages ( 4 ), a second high pressure inlet chamber of two stages ( 15 ), a first low temperature outlet chamber of two stages ( 2 ) in order; on the right end cover ( 25 ) there are a second medium pressure outlet chamber of two stages ( 21 ), a first low pressure inlet chamber of two stages ( 11 ), a first medium pressure outlet chamber of two stages ( 26 ) and a second low pressure inlet chamber of two stages ( 7 ) in order; the first high pressure inlet nozzle of two stages ( 1 ) and the second high pressure inlet nozzle of two stages ( 3 ) are respectively fixed on the left end cover ( 19 ) by bolts; the first medium pressure outlet nozzle of two stages ( 10 ) and the second medium pressure outlet nozzle of two stages ( 12 ) are respectively fixed on the right end cover ( 25 ) by bolts ( 27 ). 
     
     
         3 . According to the  claim 1  about the multistage wave rotor refrigerator, the characteristics include that the wave rotor refrigerator has 2-8 high pressure inlet nozzles which can realize 2-8 times unsteady expansion of gas in the refrigerator. 
     
     
         4 . According to the  claim 1  about the multistage wave rotor refrigerator, the characteristics include that in the wave rotor ( 5 ) of refrigerator there are 30-280 oscillation tubes ( 6 ).