# US 10,865,799 B2 · Centrifugal compression test device

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- Number: US 10,865,799 B2
- Document ID: US10865799B2
- Status: Granted
- Kind: B2
- Application number: 16/079,209
- Filed: 2017-03-15
- Published: 2019-01-31
- Granted: 2020-12-15
- Earliest claimed: 2016-03-18
- Assignees: Mitsubishi Heavy Industries Compressor Corporation
- Applicants: Mitsubishi Heavy Industries Compressor Corporation
- Inventors: Shuichi Yamashita; Akihiro Nakaniwa; Masahiro Ishikawa; Yoshiaki Shoji
- Web page: https://patentgrep.com/patent/US10865799B2

## CPC

- F04D 27/001: {Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring}
- F04D 17/12: Multi-stage pumps
- F04D 29/4213: {suction ports}
- F04D 29/444: {Bladed diffusers}
- F04D 29/684: {by fluid injection}
- F04D 29/701: {especially adapted for elastic fluid pumps}
- F05D 2250/51: Inlet
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

A centrifugal compression test device includes a flow path forming section and an inlet space forming section. The flow path forming section forms an introduction flow path, an inlet flow path, and an interstage inflow path. The introduction flow path guides a fluid from the outside toward the inside in the radial direction. The inlet flow path is connected to the introduction flow path. The interstage inflow path extends from the outside toward the inside in the radial direction and is connected to the inlet flow path. The inlet space forming section is formed an annular shape having an introduction opening section through which a fluid is introduced from a part in the circumferential direction and the outside in the radial direction at the first side of the introduction flow path. Further, a front end of the introduction flow path is connected to the inlet space forming section.

## Claims

### Claim 1

A single stage centrifugal compression test device comprising:
a rotary shaft extending in an axial direction;
a bearing rotatably support the rotary shaft about an axis of the rotary shaft;
a driving source that drives the rotary shaft around the axis;
an impeller fixed to an outer circumferential surface of the rotary shaft and configured to pump a fluid flowing from a first side in an axial direction to an outside in a radial direction while rotating together with the rotary shaft;
a flow path forming section comprising:
a curved introduction flow path that:
comprises an annular opening section that is provided at a front end of the curved introduction flow path and faces the first side of the impeller in the axial direction of the rotary shaft, and
guides a fluid from the outside in the radial direction toward the inside in the radial direction by extending inward in the radial direction after curving from the annular opening section toward the inside of the flow path forming section,
an inlet flow path connected to the introduction flow path and guides the fluid to the impeller from the first side in the axial direction, and
an interstage inflow path extending from the outside toward the inside in the radial direction and connected to the inlet flow path at a second side of the introduction flow path in the axial direction; and
an inlet space forming section having an introduction opening section through which a fluid is introduced from a part in the circumferential direction and outside in the radial direction at the first side of the introduction flow path in the axial direction, wherein the inlet space forming section forms an annular shape about the axis, and
the inlet space forming section is connected to the annular opening section of the introduction flow path, and the annular opening section opens toward an inlet space of the inlet space forming section.

### Claim 2 (depends on 1)

The single stage centrifugal compression test device according to claim 1, further comprising an annular shaped punching metal having through-holes, wherein the annular-shaped punching metal applies a pressure loss to a fluid flowing into the introduction flow path.

### Claim 3 (depends on 2)

The single stage centrifugal compression test device according to claim 2, wherein the annular shaped punching metal is only installed, within the single stage centrifugal compression test device and in the circumferential direction of the axis of the rotary shat, at a side closer to the introduction opening section than the axis of the rotary shaft.

### Claim 4 (depends on 1)

The single stage centrifugal compression test device according to claim 1, further comprising:
a return flow path forming section that forms a return flow path extending inward in the radial direction after extending from the impeller toward the outside in the radial direction; and
an outlet space forming section through which a fluid is discharged from a part in the circumferential direction and the outside in the radial direction, forming an annular shape about the axis, and to which a rear end of the return flow path is connected, at a second side of the return flow path in the axial direction.

### Claim 5 (depends on 2)

The single stage centrifugal compression test device according to claim 2, further comprising:
a return flow path forming section that forms a return flow path extending inward in the radial direction after extending from the impeller toward the outside in the radial direction; and
an outlet space forming section through which a fluid is discharged from a part in the circumferential direction and the outside in the radial direction, forming an annular shape about the axis, and to which a rear end of the return flow path is connected, at a second side of the return flow path in the axial direction.

### Claim 6 (depends on 3)

The single stage centrifugal compression test device according to claim 3, further comprising:
a return flow path forming section that forms a return flow path extending inward in the radial direction after extending from the impeller toward the outside in the radial direction; and
an outlet space forming section through which a fluid is discharged from a part in the circumferential direction and the outside in the radial direction, forming an annular shape about the axis, and to which a rear end of the return flow path is connected, at a second side of the return flow path in the axial direction.

### Claim 7 (depends on 1)

The single stage centrifugal compression test device according to claim 1, wherein the interstage inflow path extends along an extending direction of the introduction flow path from the outside toward the inside in the radial direction.