G-m refrigerator with phase modulation mechanism

Abstract

A G-M refrigerator comprises a compressor ( 1 ), a gas inlet valve ( 2 ), an exhaust valve ( 3 ), a regenerator ( 4 ), a cylinder ( 5 ), a piston ( 6 ), a hot cavity ( 7 ), a cold cavity ( 8 ), a seal ring ( 9 ), a driving mechanism ( 10 - 12 ), an annular gap ( 13 ), a heat exchanger ( 14 ), an orifice valve ( 18 ) and a gas reservoir ( 19 ). By introducing a phase modulation mechanism, such as the orifice valve ( 18 ), the gas reservoir ( 19 ) and the like, the working way of gas in the annular gap ( 13 ) is changed to be the same with that of a pulse tube refrigerator with the phase modulation mechanism, expansion of the part of the gas is fully utilized for doing work so as to generate the cold effect, loss caused by gas leakage through the seal ring ( 9 ) is further eliminated and the performances of the G-M refrigerator are further improved.

1 . A G-M refrigerator with a phase modulation mechanism, characterized by comprising a compressor ( 1 ), a gas inlet valve ( 2 ), an exhaust valve ( 3 ), a regenerator ( 4 ), a cylinder ( 5 ), a piston ( 6 ), a hot cavity ( 7 ), a cold cavity ( 8 ), a driving mechanism, an annular gap ( 13 ) and a heat exchanger ( 14 ), wherein the gas outlet end of the compressor ( 1 ) is connected with the gas inlet valve ( 2 ), the gas inlet end of the compressor ( 1 ) is connected with the exhaust valve ( 3 ), the gas inlet valve ( 2 ), the exhaust valve ( 3 ) and the regenerator ( 4 ) are communicated and connected, the regenerator ( 4 ) is communicated and connected with the cylinder ( 5 ), and the heat exchanger ( 14 ) is arranged between the regenerator ( 4 ) and the cylinder ( 5 ); the piston ( 6 ) is arranged in the cylinder ( 5 ), the cold cavity ( 8 ) is arranged below the piston ( 6 ), the hot cavity ( 7 ) is arranged above the piston ( 6 ), the annular gap ( 13 ) is arranged between the piston ( 6 ) and the inner wall of the cylinder ( 5 ), and the driving mechanism is connected on the piston ( 6 ); and the annular gap ( 13 ) is communicated with the phase modulation mechanism. 
     
     
         2 . The G-M refrigerator with the phase modulation mechanism according to  claim 1 , characterized in that the annular gap ( 13 ) can be divided into hot-end gas ( 20 ), a gas piston ( 21 ) and cold-end gas ( 22 ). 
     
     
         3 . The G-M refrigerator with the phase modulation mechanism according to  claim 1 , characterized in that the phase modulation mechanism comprises an orifice valve ( 18 ) and a gas reservoir ( 19 ), and the annular gap ( 13 ) is communicated with the gas reservoir ( 19 ) through the orifice valve ( 18 ); and a seal ring ( 9 ) is arranged between the piston ( 6 ) and the cylinder ( 5 ) in the position above the annular gap ( 13 ). 
     
     
         4 . The G-M refrigerator with the phase modulation mechanism according to  claim 1 , characterized in that the phase modulation mechanism is an orifice gas reservoir structure communicated with the hot end of the cylinder ( 6 ) or a two-way gas inlet mechanism or a four-valve mechanism or other phase modulation mechanisms which are more effective. 
     
     
         5 . The G-M refrigerator with the phase modulation mechanism according to  claim 1 , characterized in that the phase modulation mechanism can be built-in type and comprises a built-in orifice valve ( 23 ) and the gas reservoir, the built-in orifice valve ( 23 ) is placed in the annular gap ( 13 ) at the hot end of the piston ( 6 ) and the hot cavity ( 7 ) is used as the gas reservoir of the phase modulation mechanism. 
     
     
         6 . The G-M refrigerator with the phase modulation mechanism according to  claim 1 , characterized in that both the gas inlet valve ( 2 ) and the exhaust valve ( 3 ) are arranged at room temperature.