# US 8,784,078 B2 · Integrated-inverter electric compressor

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- Number: US 8,784,078 B2
- Document ID: US8784078B2
- Status: Granted
- Kind: B2
- Application number: 12/991,007
- Filed: 2009-06-10
- Published: 2011-04-21
- Granted: 2014-07-22
- Earliest claimed: 2008-09-08
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Manabu Suzuki; Ichiro Yogo; Tomoyasu Osaki
- Inventors: Manabu Suzuki; Ichiro Yogo; Tomoyasu Osaki
- Web page: https://patentgrep.com/patent/US8784078B2

## CPC

- F04B 39/121: {Casings}
- F01C 21/10: Outer members for co-operation with rotary pistons; Casings (casings for rotary engines or machines in general F16M)
- F04B 35/04: the means being electric
- F16J 15/14: by means of granular or plastic material, or fluid
- F04B 2203/0204: Frequency of the electric current
- F04C 2240/808: Electronic circuits (e.g. inverters) installed inside the machine
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- F01C: ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES (internal-combustion aspects F02B53/00, F02B55/00)
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

## Abstract

An integrated-inverter electric compressor in which an inverter accommodating section (9) is provided on the periphery of a housing, an inverter that supplies driving power to an electric motor is installed in the inverter accommodating section (9), and its opening (10) is tightly sealed with a cover (13) is configured such that a groove (16) in which a liquid sealant (20) is to be filled is provided in a flange (11) around the opening (10); the liquid sealant (20) filled in the groove (16) is cured to tightly seal a joint surface between the flange (11) and the cover (13); and when the width of a joint surface (17) formed at the inner periphery of the groove (16) in the flange (11) is L1 and the width of a joint surface (18) formed at the outer periphery of the groove (16) is L2, L1<L2 holds.

## Claims

### Claim 1

An integrated-inverter electric compressor in which an inverter accommodating section is provided on the periphery of a housing accommodating an electric motor and a compression mechanism, an inverter that supplies driving power to the electric motor is installed in the inverter accommodating section, and the accommodating section opening is tightly sealed with a cover, wherein
a groove in which a liquid sealant is to be filled is provided in a flange around the opening of the inverter accommodating section; the liquid sealant filled in the groove is cured to tightly seal a joint surface between the flange and the cover; and when the width of a joint surface formed at the inner periphery of the groove in the flange is L1 and the width of a joint surface formed at the outer periphery of the groove is L2, L1<L2 holds;
wherein the flange is provided at two opposite sides adjacent of the groove,
wherein the flange is configured such that the joint surface formed at the inner periphery of the groove is lower than the joint surface formed at the outer periphery of the groove,
wherein the flange has a second groove, which is smaller than the groove, in the lower joint surface formed at the inner periphery of the groove.

### Claim 2 (depends on 1)

The integrated-inverter electric compressor according to claim 1, wherein the groove is integrally formed by casting, in the flange of the inverter accommodating section during die-casting.

### Claim 3 (depends on 1)

The integrated-inverter electric compressor according to claim 1, wherein the groove is provided at the inner periphery of screw holes provided in the flange for mounting the cover.

### Claim 4 (depends on 1)

The integrated-inverter electric compressor according to claim 1, wherein the cover is constituted of a damping steel plate.