# US 12,180,970 B2 · Compressor

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- Number: US 12,180,970 B2
- Document ID: US12180970B2
- Status: Granted
- Kind: B2
- Application number: 18/374,328
- Filed: 2023-09-28
- Published: 2024-01-25
- Granted: 2024-12-31
- Earliest claimed: 2021-03-30
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Taiichi Nose; Hirofumi Higashi
- Web page: https://patentgrep.com/patent/US12180970B2

## CPC

- F04D 17/12: Multi-stage pumps
- F04D 17/122: {the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors}
- F04D 29/4213: {suction ports}
- F04D 29/4246: {comprising more than one outlet}
- F04D 29/444: {Bladed diffusers}
- F25B 1/053: of turbine type
- F25B 1/10: with multi-stage compression (with cascade operation F25B7/00)
- F25B 31/026: {with compressor of rotary type}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS

## Abstract

A compressor includes a first-stage compression unit configured to compress a refrigerant, a second-stage compression unit configured to compress the refrigerant compressed by the first-stage compression unit, a shaft member connected to the first-stage compression unit and the second-stage compression unit, and a cover member configured to cover the shaft member. A first passage is provided between the first-stage compression unit and the second-stage compression unit. A front chamber is provided around the cover member. The front chamber is connected to the first passage and to a second passage to which the refrigerant from an economizer is sent. The second passage is provided with a passage structure configured such that a flowing direction of the refrigerant supplied through the second passage to the front chamber is an avoidance direction. The avoidance direction is a direction that differs from a direction toward the shaft member.

## Claims

### Claim 1

A compressor comprising:
a first-stage compression unit configured to compress a refrigerant;
a second-stage compression unit configured to compress the refrigerant compressed by the first-stage compression unit;
a shaft member connected to the first-stage compression unit and the second-stage compression unit; and
a cover member configured to cover the shaft member,
a first passage being provided between the first-stage compression unit and the second-stage compression unit,
a front chamber being provided around the cover member,
the front chamber being connected to the first passage and to a second passage to which the refrigerant from an economizer is sent, and
the second passage being provided with a passage structure configured such that a flowing direction of the refrigerant supplied through the second passage to the front chamber is an avoidance direction, the avoidance direction being a direction that differs from a direction toward the shaft member,
the second passage having a first discharge port and a second discharge port, the axes of each of the first and second discharge ports defining an acute angle with regard to a longitudinal axis of the second passage,
a first branch flow portion of the second passage being provided with the first discharge port,
a second branch flow portion of the second passage being provided with the second discharge port,
a first distance between a first inner wall of the first branch flow portion closest to the longitudinal axis and the longitudinal axis increasing toward the first discharge port, and
a second distance between a second inner wall of the second branch flow portion closest to the longitudinal axis and the longitudinal axis increasing toward the second discharge port.

### Claim 2 (depends on 1)

The compressor according to claim 1, wherein
the shaft member is disposed on an axis of a connection portion of the second passage, the connection portion being connected to the front chamber.

### Claim 3 (depends on 1)

The compressor according to claim 1, wherein
the second passage includes a portion in which an area of the passage increases toward the front chamber.

### Claim 4 (depends on 1)

The compressor according to claim 1, wherein
the front chamber has a suction port that is in communication with the first passage, and
the suction port is disposed at a location spaced from the cover member.

### Claim 5 (depends on 2)

The compressor according to claim 2, wherein
the front chamber has a suction port that is in communication with the first passage, and
the suction port is disposed at a location spaced from the cover member.

### Claim 6 (depends on 1)

The compressor according to claim 1, wherein
the front chamber has a suction port that is in communication with the first passage, and
the suction port is disposed at a location spaced from the cover member.

### Claim 7 (depends on 3)

The compressor according to claim 3, wherein
the front chamber has a suction port that is in communication with the first passage, and
the suction port is disposed at a location spaced from the cover member.

### Claim 8 (depends on 4)

The compressor according to claim 4, wherein
a plurality of the suction ports are provided side by side in a circumferential direction of the shaft member.

### Claim 9 (depends on 5)

The compressor according to claim 5, wherein
a plurality of the suction ports are provided side by side in a circumferential direction of the shaft member.

### Claim 10 (depends on 6)

The compressor according to claim 6, wherein
a plurality of the suction ports are provided side by side in a circumferential direction of the shaft member.

### Claim 11 (depends on 7)

The compressor according to claim 7, wherein
a plurality of the suction ports are provided side by side in a circumferential direction of the shaft member.