US2009304519A1PendingUtilityA1

Gas-Compressor Impeller and Gas Compressor Having The Same

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Assignee: MITSUBISHI HEAVY IND LTDPriority: Jan 15, 2007Filed: Dec 20, 2007Published: Dec 10, 2009
Est. expiryJan 15, 2027(~0.5 yrs left)· nominal 20-yr term from priority
Inventors:Toyoaki YasuiAkinori TasakiKenji ItagakiNaoki HirataYuya Konno
F05D 2300/2263F05D 2230/90F05D 2300/611F04D 29/023F05D 2300/603F04D 29/289C23C 30/00C23C 4/00F05D 2230/31
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Claims

Abstract

An object is to provide a gas-compressor impeller which has excellent durability even when gas containing solid particles is compressed and which does not increase the cost. A gas-compressor impeller installed in a gas compressor that compresses gas containing solid particles has a hub portion and a plurality of blades extending substantially radially from the outer circumferential surface of the hub portion. The hub portion and the blades are rotated about the central axial line to compress gas. The blades have abrasion-resistant films only at gas inlet portions.

Claims

exact text as granted — not AI-modified
1 . A gas-compressor impeller installed in a gas compressor that compresses gas containing solid particles, the impeller having a hub portion and a plurality of blades extending radially from an outer circumferential surface of the hub portion, the hub portion and the blades being rotated about a central axial line to compress gas,
 wherein the blades have abrasion-resistant films only at gas inlet portions.   
   
   
       2 . The gas-compressor impeller according to  claim 1 ,
 wherein formation regions of the abrasion-resistant films provided only at the gas inlet portions are provided from connecting positions of the blades to the hub portion in a height direction of the blades, and   the size of the formation regions in the height direction of the blades is gradually reduced from leading edges of the blades toward a downstream side.   
   
   
       3 . The gas-compressor impeller according to  claim 2 ,
 wherein the formation regions of the abrasion-resistant films provided on ventral sides of the blades are larger than the formation regions of the abrasion-resistant films provided on back sides of the blades.   
   
   
       4 . The gas-compressor impeller according to  claim 1 ,
 wherein the abrasion-resistant films are composed of a cermet material formed by thermally spraying a composite mainly containing tungsten carbide.   
   
   
       5 . A gas compressor having the gas-compressor impeller  claim 1 .

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