# US 11,906,177 B2 · Outdoor unit

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- Number: US 11,906,177 B2
- Document ID: US11906177B2
- Status: Granted
- Kind: B2
- Application number: 17/271,941
- Filed: 2018-10-11
- Published: 2021-10-14
- Granted: 2024-02-20
- Earliest claimed: 2018-10-11
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Koichi Arisawa; Takuya Shimomugi; Takashi Yamakawa; Kenji Iwazaki; Keisuke Mori
- Web page: https://patentgrep.com/patent/US11906177B2

## CPC

- F24F 1/24: Cooling of electric components
- H05K 1/0203: {Cooling of mounted components (H05K1/0272 takes precedence)}
- H05K 7/2039: {characterised by the heat transfer by conduction from the heat generating element to a dissipating body (arrangements for increasing/decreasing heat-transfer, e.g. fins details, F28F13/00)}
- H05K 2201/066: Heatsink mounted on the surface of the printed circuit board [PCB]
- F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

An outdoor unit includes: a housing; a compressor placed in the housing; a heat exchanger placed in the housing; and a blower placed in the housing, the blower admitting air from outside the housing and passing the air through the heat exchanger. Furthermore, the outdoor unit includes: a partition plate partitioning the housing into a compressor chamber and a blower chamber; a board on which an electronic component is mounted; a heat dissipator placed in the blower chamber and adjacent to the partition plate, the heat dissipator including a base and a plurality of fins, the base having a fin formation surface, the fins projecting from the fin formation surface, the heat dissipator dissipating heat of the electronic component; and a duct covering the heat dissipator. When the fins are viewed from the fin formation surface side, the fins extend toward the blower side from the partition plate side.

## Claims

### Claim 1

An outdoor unit comprising:
a housing;
a compressor placed in the housing;
a heat exchanger placed in the housing;
a blower placed in the housing, the blower admitting air from outside the housing and passing the air through the heat exchanger;
a partition plate partitioning the housing into a compressor chamber and a blower chamber, the compressor being placed in the compressor chamber, the blower being placed in the blower chamber;
a board on which an electronic component is mounted, the electronic component driving the compressor;
a heat dissipator placed in the blower chamber and adjacent to the partition plate, the heat dissipator including a base and a plurality of fins, the base having a fin formation surface, the fins projecting from the fin formation surface, the heat dissipator dissipating heat of the electronic component; and
a duct covering a tip side of the fins in the heat dissipator to form a flow path, the air passing through the flow path, wherein
when the fins are viewed from the fin formation surface side, the fins extend toward the blower side from the partition plate side, wherein
the duct has a facing surface facing the fin formation surface,
a distance between the facing surface and the fin formation surface is greater in a region on the partition plate side than in a region on the blower side, and
an outlet is formed on the blower side of the duct, the outlet allowing the air to flow out from the flow path.

### Claim 2 (depends on 1)

The outdoor unit according to claim 1, wherein a gap is provided between the plurality of fins and the partition plate.

### Claim 3 (depends on 2)

The outdoor unit according to claim 2, wherein a height of each of the plurality of fins is greater than a distance between each of the plurality of fins and the partition plate.

### Claim 4 (depends on 3)

The outdoor unit according to claim 3, wherein
a first opening admitting the air is formed in a back surface of the housing,
a second opening allowing the air to be discharged is formed in a part of a front surface of the housing, the part corresponding to a wall surface surrounding the blower chamber, and
an inlet allowing the air to flow into the flow path is formed on the back surface side of the duct.

### Claim 5 (depends on 4)

The outdoor unit according to claim 4, wherein
the heat dissipator is provided on a first surface of the board,
a plurality of the electronic components is provided, and
the plurality of electronic components is mounted between the board and the heat dissipator, and is arranged side by side from the back surface side to the front surface side.

### Claim 6 (depends on 3)

The outdoor unit according to claim 3, wherein
the heat dissipator is provided on a first surface of the board,
a plurality of the electronic components is provided, and
the plurality of electronic components is mounted between the board and the heat dissipator, and is arranged side by side from the back surface side to the front surface side.

### Claim 7 (depends on 2)

The outdoor unit according to claim 2, wherein
a first opening admitting the air is formed in a back surface of the housing,
a second opening allowing the air to be discharged is formed in a part of a front surface of the housing, the part corresponding to a wall surface surrounding the blower chamber, and
an inlet allowing the air to flow into the flow path is formed on the back surface side of the duct.

### Claim 8 (depends on 7)

The outdoor unit according to claim 7, wherein
the heat dissipator is provided on a first surface of the board,
a plurality of the electronic components is provided, and
the plurality of electronic components is mounted between the board and the heat dissipator, and is arranged side by side from the back surface side to the front surface side.

### Claim 9 (depends on 2)

The outdoor unit according to claim 2, wherein
the heat dissipator is provided on a first surface of the board,
a plurality of the electronic components is provided, and
the plurality of electronic components is mounted between the board and the heat dissipator, and is arranged side by side from the back surface side to the front surface side.

### Claim 10 (depends on 1)

The outdoor unit according to claim 1, wherein a height of each of the plurality of fins is greater than a distance between each of the plurality of fins and the partition plate.

### Claim 11 (depends on 10)

The outdoor unit according to claim 10, wherein
a first opening admitting the air is formed in a back surface of the housing,
a second opening allowing the air to be discharged is formed in a part of a front surface of the housing, the part corresponding to a wall surface surrounding the blower chamber, and
an inlet allowing the air to flow into the flow path is formed on the back surface side of the duct.

### Claim 12 (depends on 11)

The outdoor unit according to claim 11, wherein
the heat dissipator is provided on a first surface of the board,
a plurality of the electronic components is provided, and
the plurality of electronic components is mounted between the board and the heat dissipator, and is arranged side by side from the back surface side to the front surface side.

### Claim 13 (depends on 10)

The outdoor unit according to claim 10, wherein
the heat dissipator is provided on a first surface of the board,
a plurality of the electronic components is provided, and
the plurality of electronic components is mounted between the board and the heat dissipator, and is arranged side by side from the back surface side to the front surface side.

### Claim 14 (depends on 1)

The outdoor unit according to claim 1, wherein
a first opening admitting the air is formed in a back surface of the housing,
a second opening allowing the air to be discharged is formed in a part of a front surface of the housing, the part corresponding to a wall surface surrounding the blower chamber, and
an inlet allowing the air to flow into the flow path is formed on the back surface side of the duct.

### Claim 15 (depends on 14)

The outdoor unit according to claim 14, wherein
the heat dissipator is provided on a first surface of the board,
a plurality of the electronic components is provided, and
the plurality of electronic components is mounted between the board and the heat dissipator, and is arranged side by side from the back surface side to the front surface side.

### Claim 16 (depends on 1)

The outdoor unit according to claim 1, wherein
the heat dissipator is provided on a first surface of the board,
a plurality of the electronic components is provided, and
the plurality of electronic components is mounted between the board and the heat dissipator, and is arranged side by side from the back surface side to the front surface side.