Screw compressor

Abstract

The present application provides a screw compressor, including: a housing, a pair of rotors, a pressure release channel, and a regulating device. The housing has a rotor cavity, the pair of rotors are located in the rotor cavity, and a compression cavity can be formed between teeth of the pair of rotors and the housing. Each of the pair of rotors has a gas suction end and an exhaust end, where the exhaust end has an exhaust end surface extending in a radial direction. The pressure release channel has a pressure release channel inlet and a pressure release channel outlet, where the pressure release channel inlet communicates with the compression cavity, and the pressure release channel outlet communicates with an exhaust side of the compressor. The regulating device is movably installed on the housing and is configured to controllably open or close the pressure release channel inlet so as to achieve communication or non-communication between the compression cavity and the pressure release channel. According to the compressor in the present application, gas pressure in the compression cavity can be regulated.

1 . A screw compressor, comprising:
 a housing, the housing having a rotor cavity;   a pair of rotors disposed within the rotor cavity, wherein teeth of the pair of rotors are configured to form a compression cavity with the housing, each rotor of the pair of rotors comprises a gas suction end and an exhaust end, and the exhaust end comprises an exhaust end surface extending in a radial direction;   a pressure release channel disposed in disposed within the housing, wherein the pressure release channel comprises a pressure release channel inlet and a pressure release channel outlet, the pressure release channel inlet is in communication with the compression cavity, and the pressure release channel outlet is in communication with an exhaust side of the compressor; and   a regulating device movably installed on the housing and configured to controllably open or close the pressure release channel inlet to cause communication or non-communication between the compression cavity and the pressure release channel.   
     
     
         2 . The screw compressor according to of  claim 1 , wherein:
 the regulating device is configured to:
 open the pressure release channel inlet to enable the compression cavity to communicate with the exhaust side of the compressor when a pressure in the compression cavity of the screw compressor is greater than a pressure at the exhaust side of the compressor; and 
 close the pressure release channel inlet to cause non-communication between the compression cavity and the exhaust side of the compressor when the pressure in the compression cavity of the screw compressor is less than the pressure at the exhaust side of the compressor. 
   
     
     
         3 . The screw compressor of  claim 1 , wherein;
 the housing further comprises a connection channel, wherein the connection channel comprises a connection channel inlet and a connection channel outlet, wherein the connection channel inlet is close to the exhaust ends of the pair of rotors and is configured to communicate with the compression cavity, and the connection channel outlet communicates with the pressure release channel inlet.   
     
     
         4 . The screw compressor of  claim 1 , wherein;
 the housing further comprises a regulating device cavity, wherein one end of the regulating device cavity forms the connection channel, and the pressure release channel inlet is located on a side wall of the regulating device cavity.   
     
     
         5 . The screw compressor of  claim 4 , wherein;
 the regulating device has an outer side surface extending along a circumferential direction, the outer side surface is configured to form a sealing side surface, and the regulating device is movable in the regulating device cavity such that the sealing side surface is configured to open or close the pressure release channel inlet.   
     
     
         6 . The screw compressor of  claim 5 , wherein:
 the regulating device has a head portion and a body portion,   in a radial direction of the regulating device, the head portion has a larger size than the body portion, and the sealing side surface is located at a far end of the body portion, and   the regulating device cavity comprises a first section and a second section, wherein the second section has a larger diameter than the first section, the first section is closer to the pair of rotors than the second section, the body portion is accommodated in the first section, the head portion is accommodated in the second section, and the head portion and a side wall of the second section are sealed in the circumferential direction.   
     
     
         7 . The screw compressor of  claim 6 , wherein;
 the head portion has a far end surface and a near end surface, the body portion is connected to the near end surface, the second section is divided into a first region and a second region by the head portion, the first region is enclosed by the far end surface and the side wall of the second section, the second region is enclosed by the near end surface, an outer surface of the body portion, and the side wall of the second section, the first region communicates with the exhaust side of the compressor, the second region communicates with the compression cavity, and respective volumes of the first region and the second region change with movement of the regulating device.   
     
     
         8 . The screw compressor of  claim 7 , wherein;
 the housing further comprises a pressure regulation channel, the pressure regulation channel has a pressure regulation channel inlet and a pressure regulation channel outlet, the pressure regulation channel outlet communicates with the second region, the pressure regulation channel inlet communicates with the compression cavity, and in an axial direction of the pair of rotors, the pressure regulation channel inlet is closer to the respective gas suction ends of the pair of rotors than the regulating device cavity.   
     
     
         9 . The screw compressor of  claim 3 , wherein;
 the housing has a housing fitting surface disposed facing the respective exhaust end surfaces of the exhaust ends of the pair of rotors, the connection channel inlet is located on the housing fitting surface and is configured to overlap with the exhaust end surfaces, the housing fitting surface is provided with an exhaust cavity opening, and on a radial section, a specific distance is kept between the connection channel inlet and the exhaust cavity opening.   
     
     
         10 . The screw compressor of  claim 3 , wherein;
 the rotor cavity has a rotor cavity side wall, the pressure regulation channel inlet overlaps with the rotor cavity side wall, and in an axial direction of the pair of rotors, a specific distance is kept between the pressure regulation channel inlet and the exhaust end surfaces.