Multi-stage centrifugal compressor

Patent metadata

Field	Value
Publication number	US-10851803-B2
Application number	US-201515776650-A
Country	US
Kind code	B2
Filing date	Nov 30, 2015
Priority date	Nov 30, 2015
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A multi-stage centrifugal compressor includes: a rotor including a plurality of impellers disposed in a plurality of stages in an axial direction; a plurality of diaphragms each including a guide flow path that guides a fluid discharged radially outward from one of the impellers to an adjacent impeller on the following stage, and a communication hole extended from a bottom portion of the guide flow path; a casing that accommodates the plurality of diaphragms therein; and an axial flow path that connects the plurality of communication holes to each other. The casing includes a drain flow path disposed only between the communication hole that is the closest to a suction nozzle and the communication hole that is the closest to an ejection nozzle.

First claim

The invention claimed is:

1. A multi-stage centrifugal compressor comprising:
a rotor that comprises:
a rotor main body that extends in an axial direction; and
a plurality of impellers fixed to an outer surface of the rotor main body and disposed in a plurality of stages in the axial direction;

a plurality of diaphragms arranged in the axial direction, wherein each of the diaphragms comprises:
a guide flow path that guides a fluid discharged radially outward from one of the impellers radially inward; and
a communication hole that extends downward in a perpendicular direction from a bottom portion of the guide flow path;

a casing that accommodates the plurality of the diaphragms;
an axial flow path that extends in the axial direction and connects the communication holes to each other; and
a drain pipe that extends downward in the perpendicular direction from the casing,
wherein the casing comprises:
a suction nozzle disposed on a first end portion side that
extends downward in the perpendicular direction, and
guides a working fluid from outside of the casing to one of the impellers that is on a first stage on the first end portion side;

an ejection nozzle disposed on a second end portion side that
extends downward in the perpendicular direction, and
ejects the working fluid discharged from one of the impellers disposed on a final stage on the second end portion side, to outside of the casing; and
a drain flow path disposed in the axial direction only between the communication hole that is closest to the suction nozzle and the communication hole that is closest to the ejection nozzle,

wherein the drain flow path causes the axial flow path and the outside of the casing to communicate with each other by communicating with the drain pipe,
wherein the axial flow path is formed between an outer circumferential surface of the diaphragms and an inner circumferential surface of the casing, and
wherein the inner circumferential surface of the casing is inclined gradually down toward the drain flow path.

2. The multi-stage centrifugal compressor according to claim 1 , wherein the axial flow path is formed by a gap between the outer circumferential surface of the diaphragms and the inner circumferential surface of the casing.

3. The multi-stage centrifugal compressor according to claim 1 , wherein the axial flow path is formed by a groove recessed from the outer circumferential surface of the diaphragms.

4. The multi-stage centrifugal compressor according to claim 1 , wherein the casing includes only one drain flow path.

5. The multi-stage centrifugal compressor according to claim 1 , further comprising a suction portion that suctions out the fluid from the axial flow path.

6. The multi-stage centrifugal compressor according to claim 2 , wherein the casing includes only one drain flow path.

7. The multi-stage centrifugal compressor according to claim 3 , wherein the casing includes only one drain flow path.

8. The multi-stage centrifugal compressor according to claim 2 , further comprising a suction portion that suctions out the fluid from the axial flow path.

9. The multi-stage centrifugal compressor according to claim 3 , further comprising a suction portion that suctions out the fluid from the axial flow path.

10. The multi-stage centrifugal compressor according to claim 4 , further comprising a suction portion that suctions out the fluid from the axial flow path.

11. The multi-stage centrifugal compressor according to claim 6 , further comprising a suction portion that suctions out the fluid from the axial flow path.

12. The multi-stage centrifugal compressor according to claim 7 , further comprising a suction portion that suctions out the fluid from the axial flow path.

Assignees

• Mitsubishi Heavy Ind Compressor Corp

Inventors

• Higuchi Hirofumi

Classifications

• F04D17/122 Primary

  the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors · CPC title

• F04D17/125

  the casing being vertically split · CPC title

• F04D29/706

  Humidity separation · CPC title

• F05D2260/602

  Drainage · CPC title

• F04D29/441

  especially adapted for elastic fluid pumps · CPC title