# US 4,392,789 A · Hermetically sealed motor-compressor unit for refrigerators

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- Number: US 4,392,789 A
- Document ID: US4392789A
- Status: Granted
- Kind: A
- Application number: 06/214,766
- Filed: 1980-12-09
- Granted: 1983-07-12
- Earliest claimed: 1980-02-20
- Assignees: Necchi Societa per Azioni
- Inventors: Alfredo Bar
- Web page: https://patentgrep.com/patent/US4392789A

## CPC

- F04B 39/122: {Cylinder block}
- F04B 39/0061: {using muffler volumes}
- F04B 39/06: Cooling; Heating; Prevention of freezing
- Y10S 417/902: Hermetically sealed motor pump unit
- 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)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A hermetically sealed motor-compressor unit for refrigerators, of vertical axis, comprising a container for said motor compressor unit defining a sump for the gravitational collection of oil therein and a motor compressor unit positioned within said container, said compressor unit comprising a casing defining a plate, a cylinder, silencer portions positioned at the end of said cylinder below said plate, upper support means extending upwardly from said plate, perimetral walls extending upwardly along a portion of the plate and lower support means extending downwardly from the plate supporting said motor compressor in said container; an electric motor supported on said upper support means; spherical caps fastened to said silencer portions to form silencers; a cylinder head defining a suction chamber and delivery chamber interconnected to said silencers; a vertical shaft and a lubricating member disposed on the lower end of said shaft and immersed in said sump.

## Claims

### Claim 1

A hermetically sealed motor-compressor unit for refrigerators, of vertical axis, comprising a container for said motor compressor unit defining a sump for the gravitational collection of oil therein and a motor compressor unit positioned within said container, said compressor unit comprising a casing defining a plate, a cylinder, silencer portions positioned at the end of said cylinder below said plate, upper support means extending upwardly from said plate, perimetral walls extending upwardly along a portion of the plate and lower support means extending downwardly from the plate supporting said motor compressor in said container; an electric motor supported on said upper support means; spherical caps fastened to said silencer portions to form silencers; a cylinder head defining a suction chamber and delivery chamber interconnected to said silencers; a vertical shaft and a lubricating member disposed on the lower end of said shaft and immersed in said sump.

### Claim 2 (depends on 1)

A motor-compressor unit as claimed in claim 1, including a perimetral portion without walls, said perimetral portion without walls being connected to the cylinder head and to the silencers, all these elements being partly submrged in said lubricating oil sump, so that said lubricant flows towards the sump by grazing the outer surfaces of said silencers and of said head, to remove from this latter, from the cylinder the heat accumulated in said elements.

### Claim 3 (depends on 1)

A motor-compressor unit as claimed in claim 1, including two inclined ribs provided on the casing and connected to said silencers, and along which any oil propelled against the lower part of the casing by the rotating lubrication member is conveyed on to the outer surfaces of said silencers, said silencers being immersed partly in said oil sump.