Screw Compressor and Air Conditioning Unit

Abstract

The present disclosure discloses a screw compressor and an air-conditioning unit, and relates to the field of compressors. The screw compressor has a first pressure level rotor assembly, a second pressure level rotor assembly and a body. The first pressure level rotor assembly has a first pressure level male rotor and a first pressure level female rotor; the second pressure level rotor assembly has a second pressure level male rotor and a second pressure level female rotor. Wherein, the first pressure level rotor assembly and the second pressure level rotor assembly are configured to enable an axial force received by the first pressure level rotor assembly and exerted by a compressed gas opposite to an axial force received by the second pressure level rotor assembly and exerted by a compressed gas. The force received during the operational process of the screw compressor is more balanced.

1 . A screw compressor, comprising:
 a first pressure level rotor assembly comprising a first pressure level male rotor and a first pressure level female rotor that mesh with each other;   a second pressure level rotor assembly comprising a second pressure level male rotor and a second pressure level female rotor that mesh with each other; and   a body in which the first pressure level rotor assembly and the second pressure level rotor assembly are arranged;   wherein the first pressure level rotor assembly and the second pressure level rotor assembly are configured to enable an axial force received by the first pressure level rotor assembly and exerted by a compressed gas in the first pressure level rotor assembly opposite to an axial force received by the second pressure level rotor assembly and exerted by a compressed gas therein.   
     
     
         2 . The screw compressor according to  claim 1 , wherein the first pressure level male rotor and the second pressure level male rotor are coaxially arranged. 
     
     
         3 . The screw compressor according to  claim 1 , further comprising:
 a motor disposed between the first pressure level rotor assembly and the second pressure level rotor assembly, wherein the motor comprises a motor shaft with a first end in driving connection with the first pressure level male rotor, and a second end of the motor shaft in driving connection with the second pressure level male rotor.   
     
     
         4 . The screw compressor according to  claim 3 , wherein a helix of the first pressure level male rotor has the same helical direction as a helix of the second pressure level male rotor, and the first pressure level female rotor and the second pressure level female rotor are respectively located on both sides of a shaft center line of the motor shaft. 
     
     
         5 . The screw compressor according to  claim 1 , wherein the body comprises:
 a first pressure level body in which the first pressure level rotor assembly is provided; and   a second pressure level body in which the second pressure level rotor assembly is provided, wherein a second pressure level bearing seat supports the second pressure level rotor assembly, and the second pressure level bearing seat is integrally formed with the second pressure level body.   
     
     
         6 . The screw compressor according to  claim 1 , wherein the body is provided with a fluid inlet which is located at a top of the body. 
     
     
         7 . The screw compressor according to  claim 1 , wherein the body is provided with a fluid outlet which is located at a top of the body. 
     
     
         8 . The screw compressor according to  claim 3 , wherein a helix of the first pressure level male rotor has a helical direction opposite to a helix of the second pressure level male rotor, and the first pressure level female rotor and the second pressure level female rotor are both located on a same side of a shaft center line of the motor shaft. 
     
     
         9 . The screw compressor according to  claim 1 , wherein the screw compressor comprises a plurality of groups of the first pressure level rotor assembly and the second pressure level rotor assembly. 
     
     
         10 . The screw compressor according to  claim 1 , wherein the screw compressor is a single-motor double-level screw compressor. 
     
     
         11 . The screw compressor according to  claim 3 , wherein a first end of the motor shaft is key-connected to the first pressure level male rotor, and a second end of the motor shaft is connected to the second pressure level male rotor through a coupling. 
     
     
         12 . An air-conditioning unit comprising the screw compressor according to  claim 1 .