# US 11,306,708 B2 · Hermetic compressor having discharge muffler

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- Number: US 11,306,708 B2
- Document ID: US11306708B2
- Status: Granted
- Kind: B2
- Application number: 17/041,273
- Filed: 2019-03-27
- Published: 2021-04-15
- Granted: 2022-04-19
- Earliest claimed: 2018-03-28
- Assignees: Panasonic Appliances Refrigeration Devices Singapore
- Applicants: Panasonic Appliances Refrigeration Devices Singapore
- Inventors: San Haw Chong; Kevin Kai Wei Teo
- Web page: https://patentgrep.com/patent/US11306708B2

## CPC

- F04B 35/04: the means being electric
- F04B 39/0061: {using muffler volumes}
- F04B 39/0072: {characterised by assembly or mounting}
- F04B 39/023: {Hermetic compressors}
- F04B 39/122: {Cylinder block}
- F04B 39/125: {Cylinder heads}
- F04B 39/127: {Mounting of a cylinder block in a casing}
- 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

A hermetic compressor is disclosed. The hermetic compressor comprises compressing unit and an electromotive unit. The compressing unit comprises: a cylinder block having a compression chamber; cylinder head having a discharge chamber which is controllably couplable to the compression chamber; a discharge muffler body portion and a discharge muffler cover which form a discharge muffler chamber coupled to the discharge chamber; a piston configured to compress a refrigerant in the compression chamber; and a main frame having a least one mounting leg. The electromotive unit comprises: a stator; a rotor; and a crankshaft coupled to the rotor. The electromotive unit is configured such that rotary motion of the rotor relative to the stator causes rotation of the crankshaft which drives the piston to compress the refrigerant in the compression chamber. The compressing unit is coupled to the stator of the electromotive unit and supported by the at least one mounting leg of the main frame and the discharge muffler cover.

## Claims

### Claim 1

A hermetic compressor comprising a compressing unit and an electromotive unit,
the compressing unit comprising:
a cylinder block having a compression chamber;
a cylinder head having a discharge chamber which is controllably couplable to the compression chamber;
discharge muffler body portion and a discharge muffler cover which form a discharge muffler chamber coupled to the discharge chamber;
a piston configured to compress a refrigerant in the compression chamber; and
a main frame having at least one mounting leg,
the electromotive unit comprising:
a stator;
a rotor; and
a crankshaft coupled to the rotor,
wherein the electromotive unit is configured such that rotary motion of the rotor relative to the stator causes rotation of the crankshaft which drives the piston to compress the refrigerant in the compression chamber, and
wherein the compressing unit is coupled to the stator of the electromotive unit and supported by the at least one mounting leg of the main frame and the discharge muffler cover,
the hermetic compressor further comprising a connecting bolt which attaches the discharge muffler body portion to the stator and passes through the discharge muffler cover thereby holding the discharge muffler cover in place.

### Claim 2 (depends on 1)

The hermetic compressor according to claim 1, wherein the cylinder block, the main frame and the discharge muffler body portion are integrally formed.

### Claim 3 (depends on 1)

The hermetic compressor according to claim 1, further comprising a discharge port formed in the cylinder block, the discharge port connecting the discharge chamber to the discharge muffler.

### Claim 4 (depends on 1)

The hermetic compressor according to claim 1, wherein the connecting bolt has a head which forms a snubber configured to receive a suspension spring.

### Claim 5 (depends on 1)

The hermetic compressor according to claim 1, further comprising a refrigerant discharge pipe coupled to the discharge muffler cover.

### Claim 6 (depends on 1)

The hermetic compressor according to claim 1, wherein the discharge muffler is laterally displaced from the compression chamber.

### Claim 7 (depends on 1)

The hermetic compressor according to claim 1, further comprising a second discharge muffler.