Centrifugal compressor

Patent metadata

Field	Value
Publication number	US-11378094-B2
Application number	US-201916704004-A
Country	US
Kind code	B2
Filing date	Dec 5, 2019
Priority date	Jun 28, 2017
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

A centrifugal compressor includes: an impeller; a main flow passage which receives the impeller and extends in a rotation axis direction of the impeller; an auxiliary flow passage which includes an upstream communication portion communicating to the main flow passage and a downstream communication portion communicating to the main flow passage at closer to the impeller than the upstream communication portion, and extends in a rotation direction of the impeller; a plurality of opening/closing portions which each have an opening portion and are arranged in the auxiliary flow passage; and a drive unit configured to move at least one of the plurality of opening/closing portions in the rotation direction.

First claim

What is claimed is:

1. A centrifugal compressor, comprising:
an impeller;
a main flow passage which receives the impeller and extends in a rotation axis direction of the impeller;
an auxiliary flow passage which includes an upstream communication portion communicating to the main flow passage and a downstream communication portion communicating to the main flow passage at closer to the impeller than the upstream communication portion, and extends in a rotation direction of the impeller;
a first opening/closing portion arranged in the auxiliary flow passage, the first opening/closing portion including a first opening hole;
a drive unit configured to move the first opening/closing portion in the rotation direction;
a second opening/closing portion fixed to an inner wall of the auxiliary flow passage at a position closer to the downstream communication portion with respect to the first opening/closing portion, the second opening/closing portion including a second opening hole; and
a fin positioned closer to the upstream communication portion with respect to the first opening/closing portion and integrally rotatable with the first opening/closing portion, the fin including an introduction hole having a pair of first guide surfaces continuous to the first opening hole on an upstream communication portion side, a distance between the pair of first guide surfaces decreasing as moving from the upstream communication portion side to a downstream communication portion side.

2. The centrifugal compressor according to claim 1 , further comprising:
a narrowing portion provided in the main flow passage and projecting toward an inner side in a radial direction of the impeller with respect to the upstream communication portion and the downstream communication portion.

3. The centrifugal compressor according to claim 1 , further comprising:
an impeller-side flow passage portion which is provided in the auxiliary flow passage, includes the downstream communication portion, and extends toward an inner side in a radial direction of the impeller as approaching the impeller,
wherein the plurality of first and second opening/closing portions are arranged closer to the upstream communication portion than the impeller-side flow passage portion.

4. The centrifugal compressor according to claim 2 , further comprising:
an impeller-side flow passage portion which is provided in the auxiliary flow passage, includes the downstream communication portion, and extends toward an inner side in a radial direction of the impeller as approaching the impeller,
wherein the first and second opening/closing portions are arranged closer to the upstream communication portion than the impeller-side flow passage portion.

5. The centrifugal compressor according to claim 1 , wherein
the second opening/closing portion includes a pair of second guide portions whose separation distance increases as approaching the downstream communication portion away from the upstream communication portion.

6. The centrifugal compressor according to claim 2 , wherein
the second opening/closing portion includes a pair of second guide portions whose separation distance increases as approaching the downstream communication portion away from the upstream communication portion.

7. The centrifugal compressor according to claim 3 , wherein
the second opening/closing portion includes a pair of second guide portions whose separation distance increases as approaching the downstream communication portion away from the upstream communication portion.

8. The centrifugal compressor according to claim 1 , wherein a plan-view shape of at least one of the first opening hole and the second opening hole at least has a length in the rotation direction on a radially inner side shorter than that on a radially outer side or has both end portions in the rotation direction in a curved shape.

9. The centrifugal compressor according to claim 2 , wherein a plan-view shape of at least one of the first opening hole and the second opening hole at least has a length in the rotation direction on a radially inner side shorter than that on a radially outer side or has both end portions in the rotation direction in a curved shape.

10. The centrifugal compressor according to claim 3 , wherein a plan-view shape of at least one of the first opening hole and the second opening hole at least has a length in the rotation direction on a radially inner side shorter than that on a radially outer side or has both end portions in the rotation direction in a curved shape.

11. The centrifugal compressor according to claim 4 , wherein a plan-view shape of at least one of the first opening hole and the second opening hole at least has a length in the rotation direction on a radially inner side shorter than that on a radially outer side or has both end portions in the rotation direction in a curved shape.

12. The centrifugal compressor according to claim 5 , wherein a plan-view shape of at least one of the first opening hole and the second opening hole at least has a length in the rotation direction on a radially inner side shorter than that on a radially outer side or has both end portions in the rotation direction in a curved shape.

Assignees

• Ihi Corp

Inventors

• Fujiwara Takashi
• Numakura Ryusuke
• Matsuo Kengo
• Hirata Kensuke
• Sasaki Yuji

Classifications

• F04D29/42 Primary

  for radial or helico-centrifugal pumps · CPC title

• F04D29/4206

  especially adapted for elastic fluid pumps · CPC title

• F04D29/681

  especially adapted for elastic fluid pumps · CPC title

• F04D29/441

  especially adapted for elastic fluid pumps · CPC title

• F04D27/0215

  Arrangements therefor, e.g. bleed or by-pass valves · CPC title