Centrifugal compressor

Patent metadata

Field	Value
Publication number	US-9638208-B2
Application number	US-201113879301-A
Country	US
Kind code	B2
Filing date	Dec 6, 2011
Priority date	Dec 28, 2010
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

Provided is a centrifugal compressor including a first splitter blade 7 arranged nearer to a suction side Sb of a full blade 5 F located upstream in a rotating direction of the compressor, and a second splitter blade 8 provided farther from the suction side Sb of the full blade 5 F and being shorter than the first splitter blade 7 . Leading edges 7 a and 8 a on the shroud side of the first splitter blade 7 and the second splitter blade 8 are offset from positions dividing the space between the full blades at equal intervals by the number of splitter blades therebetween toward the suction side Sb of the full blade.

First claim

The invention claimed is:

1. A centrifugal compressor impeller, comprising:
a plurality of full blades standing equally spaced in a circumferential direction and extending from a fluid inlet part to a fluid outlet part on a surface of a hub; and
two or more splitter blades each provided to extend from a point in a flow passage formed between the full blades arranged adjacent to each other, to the outlet part, wherein
the two or more splitter blades at least include
a first splitter blade provided on a side nearer to a suction side of a full blade located upstream in a rotating direction of the compressor and having a length in a flow passage direction shorter than that of the upstream side full blade; and
a second splitter blade provided on a suction side of the first splitter blade and having a length in the flow passage direction shorter than that of the first splitter blade,
wherein
leading edge portions on a shroud side of the first splitter blade and the second splitter blade are offset toward the suction side of the full blade from positions dividing a space between the full blades at equal intervals by the number of splitter blades therebetween, and
wherein
an offset amount of the leading edge portion at the shroud side of the second splitter blade, from a position at which the space between the full blades is divided by the second splitter blade to a position of the leading edge portion of the second splitter blade, is larger than an offset amount of the leading edge portion at the shroud side of the first splitter blade, from a position at which the space between the full blades is divided by the first splitter blade to a position of the leading edge portion of the first splitter blade.

2. The centrifugal compressor impeller according to claim 1 , wherein respective trailing edge portions on the hub side of the first splitter blade and the second splitter blade are offset toward the suction side of the full blade from positions dividing a space between the full blades at equal intervals by the number of splitter blades therebetween.

3. The centrifugal compressor impeller according to claim 2 , wherein respective trailing edge portions on the shroud side of the first splitter blade and the second splitter blade are offset toward a pressure side of the full blade from positions dividing a space between the full blades at equal intervals by the number of splitter blades therebetween.

4. The centrifugal compressor impeller according to claim 1 , further comprising a third splitter blade provided on a suction side of the second splitter blade and having a length in the flow passage direction shorter than that of the second splitter blade, wherein a leading edge portion on a shroud side of the third splitter blade is offset toward the suction side of the full blade from one of the positions dividing the space between the full blades at equal intervals by the number of splitter blades therebetween.

5. The centrifugal compressor according to claim 4 , wherein an offset amount of the leading edge portion at the shroud side of the third splitter blade from a position at which the space between the full blades is divided by the third splitter blade to a position of the leading edge portion of the third splitter blade, is larger than the offset amount of the leading edge portion at the shroud side of the second splitter blade.

6. The centrifugal compressor according to claim 4 , wherein an offset amount of the leading edge portion at the shroud side of the third splitter blade, from a position at which the space between the full blades is divided by the third splitter blade to a position of the leading edge portion of the third splitter blade, is larger than an offset amount of the leading edge portion at the shroud side of the second splitter blade.

7. The centrifugal compressor impeller according to claim 1 , further comprising a third splitter blade provided on a suction side of the second splitter blade and having a length in the flow passage direction shorter than that of the second splitter blade, wherein a leading edge portion on a shroud side of the third splitter blade is offset toward the suction side of the full blade from one of the positions dividing the space between the full blades at equal intervals by the number of splitter blades therebetween.

Assignees

• Tomita Isao
• Hoshi Toru
• Mitsubishi Heavy Ind Ltd

Inventors

• Tomita Isao
• Hoshi Toru

Classifications

• F05D2240/304

  related to the trailing edge of a rotor blade · CPC title

• F05D2240/307

  related to the tip of a rotor blade · CPC title

• F05D2240/303

  related to the leading edge of a rotor blade · CPC title

• F04D29/666

  by means of rotor construction or layout, e.g. unequal distribution of blades or vanes · CPC title

• F04D29/284 Primary

  for compressors · CPC title