Air-floating centrifugal compressor

Abstract

The present invention discloses an air-floating centrifugal compressor, including a motor, an impeller, an air inlet, an outlet port, and a connection pipe. The motor includes a housing and a rotor, a first chamber and a second chamber are arranged at two ends inside the housing, and an air-floating radial bearing is arranged on the rotor. The impeller is fixed to the end of the rotor and is located in the first chamber and/or the second chamber. The air inlet of the first chamber is connected to the air inlet, and the air outlet is connected to one end of the connecting pipe, the air outlet of the second chamber is connected to the outlet port, and the air inlet is connected to the other end of the connecting pipe.

What is claimed is: 
     
         1 . An air-floating centrifugal compressor, comprising:
 a motor, comprising:
 a housing, wherein a first chamber and a second chamber are respectively arranged at two ends of an interior of the housing; and 
 a rotor, wherein a radial bearing is arranged on the rotor, and the radial bearing is an air-bearing configured to support the rotor in a radial direction; 
   an impeller, arranged at an end of the rotor and located in the first chamber and/or the second chamber, wherein the impeller is a hoop type closed impeller or a riveting type closed impeller or is manufactured by a high-temperature high-pressure diffusion welding;   an air inlet, connected to an air inlet of the first chamber;   an outlet port, connected to an air outlet of the second chamber; and   a connecting pipe, wherein two ends of the connecting pipe are respectively connected with an air outlet of the first chamber and an air inlet of the second chamber.   
     
     
         2 . The air-floating centrifugal compressor according to  claim 1 , the rotor comprises:
 a core shaft, being internally hollow;   a right half shaft and a left half shaft, connected to two ends of the core shaft, respectively;   a hollow magnet steel, sleeved on the core shaft; and   a protective sleeve, wherein two ends of an inner wall of the protective sleeve are located on the left half shaft and the right half shaft, respectively, and the hollow magnetic steel is located between the core shaft and the protective sleeve, the protective sleeve is configured to fix the hollow magnetic steel.   
     
     
         3 . The air-floating centrifugal compressor according to  claim 1 , wherein the motor is a high-speed permanent magnet synchronous motor. 
     
     
         4 . The air-floating centrifugal compressor according to  claim 1 , further comprising:
 a thrust disc, arranged at an end of the rotor; and   thrust bearings, arranged on one or both sides of the thrust disc and being air-bearings.   
     
     
         5 . The air-floating centrifugal compressor according to  claim 1 , wherein the radial bearing is a foil type dynamic pressure air-bearing. 
     
     
         6 . The air-floating centrifugal compressor according to  claim 1 , wherein the first chamber or the second chamber comprises a multi-stage impeller. 
     
     
         7 . The air-floating centrifugal compressor according to  claim 1 , wherein the impeller is fixed to the end of the rotor by means of a lock nut. 
     
     
         8 . The air-floating centrifugal compressor according to  claim 1 , wherein the hoop type closed impeller comprises:
 an impeller cover;   an impeller, connected to the impeller cover by means of a hoop; and   a hoop, comprising:
 an impeller cover side crimp, connected to the impeller cover; 
 an impeller side crimp, connected to the impeller; and 
 a crimp connection portion, connecting the impeller cover side crimp to the impeller side crimp. 
   
     
     
         9 . The air-floating centrifugal compressor according to  claim 8 , wherein a sealing structure is arranged on a side of the impeller cover of the impeller. 
     
     
         10 . The air-floating centrifugal compressor according to  claim 1 , wherein the riveting type closed impeller comprises:
 an impeller cover;   an impeller, connected to the impeller cover by means of a rivet; and   a rivet, comprising:
 a rivet impeller cover segment, connected to the impeller cover; 
 a rivet impeller segment, connected to the impeller; and 
 a rivet intermediate segment, connecting the rivet impeller cover segment to the rivet impeller segment. 
   
     
     
         11 . The air-floating centrifugal compressor according to  claim 10 , wherein a sealing structure is arranged on a side of the impeller cover of the impeller. 
     
     
         12 . The air-floating centrifugal compressor according to  claim 1 , wherein end caps are arranged at the air outlet of the first chamber and at the air outlet of the second chamber. 
     
     
         13 . The air-floating centrifugal compressor according to  claim 1 , wherein the air-floating centrifugal compressor further comprises an interstage air supplement port, and the interstage air supplement port is arranged on the connecting pipe. 
     
     
         14 . A manufacturing method for the impeller of the air-floating centrifugal compressor according to  claim 1 , wherein the impeller is made by means of a high-temperature and high-pressure diffusion welding, and the high-temperature and high-pressure diffusion welding comprises the steps of:
 providing the impeller and an impeller cover;   arranging the impeller and the impeller cover in a vacuum of a diffusion welding equipment;   heating the impeller and the impeller cover in the vacuum of the diffusion welding equipment; and   pressing contact surfaces between the impeller and the impeller cover using a clamp to cause plastic deformation of the contact surfaces and welding the impeller and the impeller cover together by means of eutectic reaction of atomic inter-diffusion.