# US 9,518,574 B2 · Suction muffler for compressor

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- Number: US 9,518,574 B2
- Document ID: US9518574B2
- Status: Granted
- Kind: B2
- Application number: 14/125,018
- Filed: 2012-06-08
- Published: 2014-04-17
- Granted: 2016-12-13
- Earliest claimed: 2011-06-10
- Assignees: Sanden Holdings Corporation
- Applicants: Takahisa Tobe
- Inventors: Takahisa Tobe
- Web page: https://patentgrep.com/patent/US9518574B2

## CPC

- F04B 39/0072: {characterised by assembly or mounting}
- F04B 39/0061: {using muffler volumes}
- F04B 39/023: {Hermetic compressors}
- F04B 39/04: Measures to avoid lubricant contaminating the pumped fluid
- 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)

## Abstract

To prevent oil from being drawn into a suction muffler of a compressor, a suction muffler 7 is disposed in a compressor casing at an inlet of a compression chamber at an upstream side of a refrigerant passage and positioned so that the suction muffler 7 receives oil, in which an upper lid member 71, and a lower lid member 72 having a bottom wall to which refrigerant introducing and leading-out pipes 8, 72d are connected, are fitted and secured by bringing an inner face of a side wall of the member 71 into tight contact with an outer face of a side wall of the member 72, and a protruding portion 72f is provided by forming a lower end of side wall of the member 71 to protrude below a lower face of bottom wall of the member 72, to surround connecting portions of the pipes 8, 72d.

## Claims

### Claim 1

A suction muffler for a compressor, the suction muffler being disposed in a compressor casing at an inlet of a compression chamber on an upstream side of a refrigerant passage and disposed at a location at which the suction muffler receives oil sprayed from above in the casing,
wherein an introducing pipe and a leading-out pipe of a refrigerant are connected upward to the suction muffler from beneath the suction muffler, and
wherein at an outside of connecting portions of the introducing pipe and the leading-out pipe of the refrigerant, each of which is connected to the suction muffler, a protruding portion which protrudes below the connecting portions and surrounds the connecting portions is provided,
the suction muffler comprising:
an upper lid member which has an open lower face; and
a lower lid member which has an open upper face and a bottom wall to which the introducing pipe and the leading-out pipe of the refrigerant are connected,
wherein an inner face of a side wall of the upper lid member is joined to an outer face of a side wall of the lower lid member, to be fitted and secured thereto, and
wherein the protruding portion is provided by forming a lower end of the side wall of the upper lid member to protrude below a downward facing surface of the bottom wall of the lower lid member connected with the introducing pipe and the leading-out pipe of the refrigerant.

### Claim 2 (depends on 1)

The suction muffler for the compressor according to claim 1, wherein the upper lid member and the lower lid member are secured by engaging a protrusion formed on one of the side walls and an engaging hole formed on the other of the side walls.

### Claim 3 (depends on 1)

The suction muffler for the compressor according to claim 1, wherein to an attaching hole which is formed to penetrate through the bottom wall of the lower lid member, a rubber bush is attached, and an end of the refrigerant introducing pipe disposed to penetrate through the casing is press-fitted and attached in an inner peripheral surface of the bush.

### Claim 4

A suction muffler for a compressor, the suction muffler being disposed in a compressor casing at an inlet of a compression chamber on an upstream side of a refrigerant passage and disposed at a location at which the suction muffler receives oil sprayed from above in the casing,
wherein an introducing pipe and a leading-out pipe of a refrigerant are connected upward to the suction muffler from beneath the suction muffler, and
wherein at an outside of connecting portions of the introducing pipe and the leading-out pipe of the refrigerant, each of which is connected to the suction muffler, a protruding portion which protrudes below the connecting portions and surrounds the connecting portions is provided,
the suction muffler comprising:
an upper lid member which has an open lower face; and
a lower lid member which has an open upper face and a bottom wall to which the introducing pipe and the leading-out pipe of the refrigerant are connected,
wherein an inner face of a side wall of the upper lid member is joined to an outer face of a side wall of the lower lid member, to be fitted and secured thereto, and
wherein the protruding portion is provided on a bottom wall of the lower lid member to protrude below a downward facing surface of the bottom wall connected with the introducing pipe and the leading-out pipe of the refrigerant.

### Claim 5 (depends on 4)

The suction muffler for the compressor according to claim 4, wherein the upper lid member and the lower lid member are secured by engaging a protrusion formed on one of the side walls and an engaging hole formed on the other of the side walls.

### Claim 6 (depends on 4)

The suction muffler for the compressor according to claim 4, wherein to an attaching hole which is formed to penetrate through the bottom wall of the lower lid member, a rubber bush is attached, and an end of the refrigerant introducing pipe disposed to penetrate through the casing is press-fitted and attached at an inner peripheral surface of the bush.