# US 8,465,251 B2 · Compressor device

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- Number: US 8,465,251 B2
- Document ID: US8465251B2
- Status: Granted
- Kind: B2
- Application number: 12/601,855
- Filed: 2008-09-25
- Published: 2010-07-08
- Granted: 2013-06-18
- Earliest claimed: 2007-09-28
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Hiroyuki Hosoya; Hiroshi Suzuki
- Inventors: Hiroyuki Hosoya; Hiroshi Suzuki
- Web page: https://patentgrep.com/patent/US8465251B2

## CPC

- F04D 29/4213: {suction ports}
- F04D 29/665: {by means of resonance chambers or interference}
- F04D 29/685: {Inducing localised fluid recirculation in the stator-rotor interface}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

There is provided a compressor device in which resonance in a circulating channel is reduced so that an increase in noise generated from the compressor device is prevented. The compressor device includes: a plurality of blades rotated about a rotation axis; an air inlet extending along the rotation axis and introducing air to the blades; a circulating channel disposed on a circumference centered on the rotation axis and communicating between the air inlet and the shroud of the blades; and a strut extending radially centered on the rotation axis and dividing the circulating channel. Resonance frequencies determined from circumferential lengths in the circulating channels divided by the strut are higher than a noise frequency determined from the rotational speed of the blades and the number of blades.

## Claims

### Claim 1

A compressor device comprising:
a plurality of blades on an impeller rotated about a rotation axis;
an air inlet extending along the rotation axis and introducing air to the blades;
a circulating channel disposed on a circumference of the air inlet and centered on the rotation axis of the impeller and communicating between the air inlet and a shroud of the blades; and
a strut extending radially centered on the rotation axis and dividing the circulating channel;
wherein resonance frequencies determined from circumferential lengths in the circulating channels divided by the strut are higher than a noise frequency determined from a rotational speed of the blades and the number of blades, and
wherein the circumferential length L of the circulating channel is shorter than a value expressed by the following equation:
L=60c1×C/(NZ),
where c1 is a coefficient determined by a shape of the circulating channel, C is the velocity of sound, N is a rotation speed of the blades, and Z is a number of blades.

### Claim 2

A compressor device comprising:
a plurality of blades rotated about a rotation axis;
an air inlet extending along the rotation axis and introducing air to the blades;
a circulating channel disposed on a substantially cylindrical member having the rotation axis in an interior thereof and communicating between the air inlet and a shroud of the blades; and
a strut extending radially centered on the rotation axis and dividing the circulating channel in a circumferential direction of the air inlet;
wherein circumferential lengths in circulating channels divided by the strut differ from one circulating channel to another.

### Claim 3 (depends on 1)

The compressor device according to claim 1, wherein surfaces of the strut opposite the circulating channel are formed of curved surfaces.

### Claim 4 (depends on 1)

The compressor device according to claim 1, wherein the circumferential length of the strut centered on the rotation axis changes along the rotation axis.

### Claim 5 (depends on 2)

The compressor device according to claim 2, wherein surfaces of the strut opposite the circulating channel are formed of curved surfaces.

### Claim 6 (depends on 2)

The compressor device according to claim 2, wherein a circumferential length of the strut centered on the rotation axis changes along the rotation axis.