Centrifugal compressor

Patent metadata

Field	Value
Publication number	US-2020109719-A1
Application number	US-201916704004-A
Country	US
Kind code	A1
Filing date	Dec 5, 2019
Priority date	Jun 28, 2017
Publication date	Apr 9, 2020
Grant date	—

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 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.

2 . The centrifugal compressor according to claim 1 , further comprising:
a narrowing portion 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 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 plurality of 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 plurality of opening/closing portions include a first opening/closing portion and a second opening/closing portion located closer to the downstream communication portion than the first opening/closing portion, and the first opening/closing portion includes a pair of first guide portions whose separation distance decreases as approaching the downstream communication portion away from the upstream communication portion.

6 . The centrifugal compressor according to claim 2 , wherein
the plurality of opening/closing portions include a first opening/closing portion and a second opening/closing portion located closer to the downstream communication portion than the first opening/closing portion, and the first opening/closing portion includes a pair of first guide portions whose separation distance decreases as approaching the downstream communication portion away from the upstream communication portion.

7 . The centrifugal compressor according to claim 3 ,wherein
the plurality of opening/closing portions include a first opening/closing portion and a second opening/closing portion located closer to the downstream communication portion than the first opening/closing portion, and the first opening/closing portion includes a pair of first guide portions whose separation distance decreases as approaching the downstream communication portion away from the upstream communication portion.

8 . The centrifugal compressor according to claim 4 ,wherein
the plurality of opening/closing portions include a first opening/closing portion and a second opening/closing portion located closer to the downstream communication portion than the first opening/closing portion, and the first opening/closing portion includes a pair of first guide portions whose separation distance decreases as approaching the downstream communication portion away from the upstream communication portion.

9 . The centrifugal compressor according to claim 1 , wherein
the plurality of opening/closing portions include a first opening/closing portion and a second opening/closing portion located closer to the downstream communication portion than the first opening/closing portion, and 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.

10 . The centrifugal compressor according to claim 2 , wherein
the plurality of opening/closing portions include a first opening/closing portion and a second opening/closing portion located closer to the downstream communication portion than the first opening/closing portion, and 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.

11 . The centrifugal compressor according to claim 3 , wherein
the plurality of opening/closing portions include a first opening/closing portion and a second opening/closing portion located closer to the downstream communication portion than the first opening/closing portion, and 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.

12 . The centrifugal compressor according to claim 5 , wherein
the plurality of opening/closing portions include a first opening/closing portion and a second opening/closing portion located closer to the downstream communication portion than the first opening/closing portion, and 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.

13 . The centrifugal compressor according to claim 1 , wherein a plan-view shape of the opening portion 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.

14 . The centrifugal compressor according to claim 2 , wherein a plan-view shape of the opening portion 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.

15 . The centrifugal compressor according to claim 3 , wherein a plan-view shape of the opening portion 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.

16 . The centrifugal compressor according to claim 5 , wherein a plan-view shape of the opening portion 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.

17 . The centrifugal compressor according to claim 9 , wherein a plan-view shape of the opening portion 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

• F04D29/44

  Fluid-guiding means, e.g. diffusers · CPC title

• F04D29/46

  adjustable · CPC title

• F04D29/22

  specially for centrifugal pumps · CPC title

• F04D29/66

  Combating cavitation, whirls, noise, vibration or the like (gas-flow silencers for machines or engines in general F01N); Balancing (surge control F04D27/02) · CPC title

• F04D29/42 Primary

  for radial or helico-centrifugal pumps · CPC title