US2020040899A1PendingUtilityA1

Centrifugal compressor

47
Assignee: IHI CORPPriority: Apr 25, 2017Filed: Oct 9, 2019Published: Feb 6, 2020
Est. expiryApr 25, 2037(~10.7 yrs left)· nominal 20-yr term from priority
Inventors:Takahiro UenoRyusuke Numakura
F04D 29/4213F04D 29/42F04D 17/08F04D 27/0215F04D 29/441
47
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Claims

Abstract

A centrifugal compressor includes: a compressor impeller; a main flow passage in which the impeller is arranged, the main flow passage extending in a rotational axis direction of the impeller; a sub flow passage including an upstream communication passage communicating with the main flow passage and a downstream communication passage communicating with the main flow passage on the impeller side with respect to the upstream communication passage; N first partitions fixed to the sub flow passage and arranged while spaced apart from each other in a rotation direction of the impeller; and M second partitions (where N−4≤M≤N+4) fixed on the upstream communication passage side with respect to the first partitions in the sub flow passage, the M second partitions arranged while spaced apart from each other in the rotation direction.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A centrifugal compressor comprising:
 an impeller;   a main flow passage in which the impeller is arranged, the main flow passage extending in a rotational axis direction of the impeller;   a sub flow passage including an upstream communication passage communicating with the main flow passage and a downstream communication passage communicating with the main flow passage on the impeller side with respect to the upstream communication passage;   N first partitions fixed to the sub flow passage and arranged while spaced apart from each other in a rotation direction of the impeller; and   M second partitions (where N−4≤M≤N+4) fixed on the upstream communication passage side with respect to the first partitions in the sub flow passage, the M second partitions arranged while spaced apart from each other in the rotation direction.   
     
     
         2 . The centrifugal compressor according to  claim 1 , wherein a thickness of the first partitions in the rotation direction is less than or equal to five times a thickness of the second partitions in the rotation direction. 
     
     
         3 . The centrifugal compressor according to  claim 1 , wherein the downstream communication passage opens between the multiple first partitions. 
     
     
         4 . The centrifugal compressor according to  claim 2 , wherein the downstream communication passage opens between the multiple first partitions. 
     
     
         5 . The centrifugal compressor according to  claim 1 , wherein an inner wall surface of the upstream communication passage on a side spaced apart from the impeller is inclined in a direction closer to the impeller as the inner wall surface is closer to the main flow passage. 
     
     
         6 . The centrifugal compressor according to  claim 2 , wherein an inner wall surface of the upstream communication passage on a side spaced apart from the impeller is inclined in a direction closer to the impeller as the inner wall surface is closer to the main flow passage. 
     
     
         7 . The centrifugal compressor according to  claim 3 , wherein an inner wall surface of the upstream communication passage on a side spaced apart from the impeller is inclined in a direction closer to the impeller as the inner wall surface is closer to the main flow passage. 
     
     
         8 . The centrifugal compressor according to  claim 4 , wherein an inner wall surface of the upstream communication passage on a side spaced apart from the impeller is inclined in a direction closer to the impeller as the inner wall surface is closer to the main flow passage. 
     
     
         9 . The centrifugal compressor according to  claim 1 , wherein the second partitions extend in a radial direction of the impeller. 
     
     
         10 . The centrifugal compressor according to  claim 2 , wherein the second partitions extend in a radial direction of the impeller. 
     
     
         11 . The centrifugal compressor according to  claim 3 , wherein the second partitions extend in a radial direction of the impeller. 
     
     
         12 . The centrifugal compressor according to  claim 4 , wherein the second partitions extend in a radial direction of the impeller. 
     
     
         13 . The centrifugal compressor according to  claim 5 , wherein the second partitions extend in a radial direction of the impeller. 
     
     
         14 . The centrifugal compressor according to  claim 6 , wherein the second partitions extend in a radial direction of the impeller. 
     
     
         15 . The centrifugal compressor according to  claim 7 , wherein the second partitions extend in a radial direction of the impeller. 
     
     
         16 . The centrifugal compressor according to  claim 8 , wherein the second partitions extend in a radial direction of the impeller.

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