Rotary machine

Patent metadata

Field	Value
Publication number	US-2019048877-A1
Application number	US-201616077162-A
Country	US
Kind code	A1
Filing date	Dec 8, 2016
Priority date	Mar 28, 2016
Publication date	Feb 14, 2019
Grant date	—

Abstract

A centrifugal compressor according to the present invention includes, as gas flow paths, diffuser flow paths into which process gas flowing from impellers to outside in a radial direction flows, curved flow paths that respectively communicate with the diffuser flow paths and change a flowing direction of the process gas from a direction toward the outside in the radial direction to a direction toward inside in the radial direction, and return flow paths that respectively communicate with the curved flow paths and cause the process gas flowing through the curved flow paths to flow into the impellers. In the present invention, the curved flow path configuring at least one of the gas flow paths is provided between a diaphragm and a flow path forming body that is provided between the diaphragm and the casing.

First claim

1 . A rotary machine, comprising:
a casing; a rotor that includes a rotary shaft rotatably supported inside the casing, and a plurality of stages of impellers fixed to an outer periphery of the rotary shaft; diaphragms respectively surrounding the impellers; and gas flow paths through which process gas to be compressed flows, the gas flow paths being provided respectively corresponding to the impellers, wherein the gas flow paths include diffuser flow paths into which the process gas flowing out from the impellers to outside in a radial direction flows, curved flow paths that respectively communicate with the diffuser flow paths and change a flowing direction of the process gas from a direction toward the outside in the radial direction to a direction toward inside in the radial direction, and return flow paths that respectively communicate with the curved flow paths and cause the process gas flowing through the curved flow paths, to flow into the impellers, and the curved flow path configuring at least one of the gas flow paths is provided between the diaphragm and a flow path forming body that is provided between the diaphragm and the casing, the flow path forming body provided such as to substitute a part of the casing.

2 . The rotary machine according to claim 1 , wherein
the casing includes an annular accommodating groove recessed outward in the radial direction, corresponding to a region provided with the flow path forming body, and the flow path forming body includes an annular shape and is mated with the accommodating groove.

3 . The rotary machine according to claim 1 , wherein the flow path forming body is positioned based on one or both of temperature of the process gas and a range where water injection is performed.

4 . The rotary machine according to claim 3 , wherein the curved flow path configuring the gas flow path located in at least a last stage, out of the gas flow paths, is provided between the corresponding diaphragm and the flow path forming body.

5 . The rotary machine according to claim 3 , wherein the curved flow paths configuring the gas flow paths located in all stages within the range where the water injection is performed, out of the gas flow paths, are provided between the diaphragms and the flow path forming body.

6 . The rotary machine according to claim 3 , wherein the curved flow path configuring the gas flow path located in a rear stage within the range where the water injection is performed, out of the gas flow paths, is provided between the corresponding diaphragm and the flow path forming body.

7 . The rotary machine according to claim 1 , wherein the flow path forming body includes flow paths corresponding to the curved flow paths.

8 . The rotary machine according to claim 1 , wherein
the casing is a horizontal divisional casing including a lower half casing and an upper half casing, and the curved flow paths provided between the diaphragms and the flow path forming body are provided on one or both of the lower half casing and the upper half casing.

9 . The rotary machine according to claim 1 , wherein the curved flow paths other than the curved flow paths provided between the diaphragms and the flow path forming body, are provided between the diaphragms and the casing.

10 . The rotary machine according to claim 1 , wherein the casing is covered with a heat insulation material.

11 . The rotary machine according to claim 1 , wherein
the casing includes paired bearings supporting the rotary shaft, and bearing chambers respectively accommodating the bearings each include a heat shielding material.

Assignees

• Mitsubishi Heavy Ind Compressor Corp

Inventors

• Yoko Kazutoshi
• Yanagisawa Shin
• Yanagisawa Eiichi
• Nakaniwa Akihiro
• Hirata Daisuke
• Matsueda Takanori

Classifications

• F04D17/12 Primary

  Multi-stage pumps · CPC title

• F04D29/705

  Adding liquids · CPC title

• F04D29/5846

  cooling by injection · CPC title

• F04D29/4206

  especially adapted for elastic fluid pumps · CPC title

• F04D29/42

  for radial or helico-centrifugal pumps · CPC title