Compressor

Abstract

In a compressor provided with two compression mechanisms of a rotary type compression mechanism and a scroll type compression mechanism, torque fluctuations are reduced. The compressor 1 includes a hermetic housing 2 , a low stage-side compression mechanism 3 and a high stage-side compression mechanism 4 provided in the hermetic housing 2 ; and an electric motor 21 for driving the low stage-side compression mechanism 3 and the high stage-side compression mechanism 4 . The low stage-side compression mechanism 3 is a rotary type compression mechanism, and the high stage-side compression mechanism 4 is a scroll type compression mechanism. The suction shutoff of the scroll type compression mechanism is accomplished when a rotor 34 of the rotary type compression mechanism is at a position A corresponding to the bottom dead center, at a position B of being rotated through 90 degrees from the bottom dead center, or between the positions A and B.

1 . A compressor comprising:
 a hermetic housing;   a low stage-side compression mechanism and a high stage-side compression mechanism provided in the hermetic housing; and   an electric motor for driving the low stage-side compression mechanism and the high stage-side compression mechanism,   one of the low stage-side compression mechanism and the high stage-side compression mechanism being a rotary type compression mechanism, and the other thereof being a scroll type compression mechanism, wherein   the rotary type compression mechanism has a rotor and a blade reciprocating between a top dead center of the blade and a bottom dead center of the blade with the rotation of the rotor while the tip end thereof is in contact with the rotor; and   a suction shutoff of the scroll type compression mechanism is accomplished when the rotor is at a position A corresponding to the bottom dead center, at a position B of being rotated through 90 degrees from the position corresponding to the bottom dead center, or between the positions A and B.   
   
   
       2 . The compressor according to  claim 1 , wherein
 the rotary type compressor mechanism has a single cylinder.   
   
   
       3 . The compressor according to  claim 1 , wherein
 the low stage-side compression mechanism is configured by the rotary type compression mechanism, and   the high stage-side compression mechanism is configured by the scroll type compression mechanism.   
   
   
       4 . The compressor according to  claim 3 , wherein
 the scroll type compression mechanism has a capacity control mechanism including an exhaust port for refrigerant gas, and   the suction shutoff is accomplished when the exhaust port is closed by an orbiting scroll of the scroll type compression mechanism.   
   
   
       5 . The compressor according to  claim 4 , wherein
 the capacity control mechanism includes at least two exhaust ports.   
   
   
       6 . A compressor comprising:
 a hermetic housing;   a low stage-side compression mechanism and a high stage-side compression mechanism provided in the hermetic housing; and   an electric motor for driving the low stage-side compression mechanism and the high stage-side compression mechanism,   one of the low stage-side compression mechanism and the high stage-side compression mechanism being a two-cylinder rotary type compression mechanism, and the other thereof being a scroll type compression mechanism, wherein   the rotary type compression mechanism has a rotor and a blade reciprocating between a top dead center and a bottom dead center with the rotation of the rotor while the tip end thereof is in contact with the rotor; and   a suction shutoff of the scroll type compression mechanism is accomplished when the rotor is at a position C of being rotated through −80 degrees from a position corresponding to the bottom dead center, at a position D of being rotated through −100 degrees from the position corresponding to the bottom dead center, or between the positions C and D, or at a position E of being rotated through 80 degrees from the position corresponding to the bottom dead center, at a position F of being rotated through 100 degrees from the position corresponding to the bottom dead center, or between the positions E and F′.   
   
   
       7 . The compressor according to  claim 6 , wherein
 the low stage-side compression mechanism is configured by the rotary type compression mechanism, and the high stage-side compression mechanism is configured by the scroll type compression mechanism.   
   
   
       8 . The compressor according to  claim 7 , wherein
 the scroll type compression mechanism has a capacity control mechanism including an exhaust port for refrigerant gas; and   the suction shutoff is accomplished when the exhaust port is closed by an orbiting scroll of the scroll type compression mechanism.