Compressor or Gas Extraction System

Patent metadata

Field	Value
Publication number	US-2016290362-A1
Application number	US-201414655968-A
Country	US
Kind code	A1
Filing date	Jul 11, 2014
Priority date	Jul 11, 2014
Publication date	Oct 6, 2016
Grant date	—

Abstract

A compressor capable of cooling an electric motor which drives a compressor impeller even in an environment where no external refrigerant is obtained is to be provided.
A compressor includes: an electric motor; an impeller which rotates with rotation of the electric motor; a main flow path formed downstream of the impeller, and a bypass flow path branching off from the main flow path; a heat exchange unit which is arranged upstream of the impeller and where gas upstream of the impeller and gas inside the bypass flow path exchange heat; and a pressure reducing device which is arranged further downstream than the heat exchange unit with respect to the bypass flow path and situated inside a flow path communicating with the inside of the electric motor.

First claim

1 . A compressor comprising:
an electric motor; an impeller which rotates with rotation of the electric motor; a main flow path formed downstream of the impeller, and a bypass flow path branching off from the main flow path; a heat exchange unit which is arranged upstream of the impeller and where gas upstream of the impeller and gas inside the bypass flow path exchange heat; and a pressure reducing device which is arranged further downstream than the heat exchange unit with respect to the bypass flow path and situated inside a flow path communicating with the inside of the electric motor.

2 . A compressor comprising:
an electric motor; an impeller which rotates with rotation of the electric motor; a main flow path formed downstream of the impeller, and a splitting unit which extracts a part of gas from the main flow path; a heat exchange unit which is arranged upstream of the impeller and where gas upstream of the impeller and a split gas extracted by the splitting unit exchange heat; and a pressure reducing device which reduces pressure of the split gas cooled by the heat exchange unit; the electric motor being cooled by the split gas having the pressure reduced by the pressure reducing device.

3 . The compressor according to claim 1 , comprising a filtering device inside the bypass flow path.

4 . The compressor according to claim 3 , wherein the filtering device is arranged downstream of the heat exchange unit inside the bypass flow path.

5 . The compressor according to claim 4 , wherein the filtering device also functions as the pressure reducing device.

6 . The compressor according to claim 3 , wherein the filtering device is a cyclone separator.

7 . The compressor according to claim 1 , wherein the heat exchange unit has a structure in which a pipe forming a part of the bypass flow path is spirally wound.

8 . The compressor according to claim 7 , further comprising an outer casing that covers an outer peripheral side of the impeller,
wherein the heat exchange unit has a structure in which the pipe is spirally wound on the outer casing.

9 . A gas extraction system comprising:
the compressor according to claim 1 ; a power supply device which is a motive power of the compressor; and a power cable which supplies electric power from the power supply device to the compressor; the compressor being installed inside a gas well which guides gas from an underground gas reservoir to a ground surface.

Assignees

• Hitachi Ltd

Inventors

• IWANO Ryuuichirou

Classifications

• F04D17/10

  for compressing or evacuating · CPC title

• F04D29/5806 Primary

  Cooling the drive system · CPC title

• F04D27/009

  by bleeding, by passing or recycling fluid · CPC title

• F04D29/284

  for compressors · CPC title

• F04D29/522

  especially adapted for elastic fluid pumps · CPC title