Thermal insulation system for the discharge of gas in a refrigeration compressor

Patent metadata

Field	Value
Publication number	US-9909581-B2
Application number	US-201314433188-A
Country	US
Kind code	B2
Filing date	Oct 2, 2013
Priority date	Oct 3, 2012
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A compressor includes: a cylinder crankcase defining a cylinder closed by a valve plate provided with at least one discharge orifice; a cylinder cap seated against the valve plate and in the interior of which is defined a discharge chamber. A hollow body defines at least one plenum mounted internal to the cylinder cap, maintaining a gap with the latter. The hollow body is seated against the valve plate, preventing the direct contact thereof with the inner volume of the hollow body, the latter being provided with an inlet nozzle communicating the plenum with the discharge orifice of the valve plate, and with an outlet nozzle communicating the plenum with a gas outlet of the cylinder cap.

First claim

The invention claimed is:

1. A thermal insulation system for a discharge of a gas in a refrigeration compressor of a type which comprises: a cylinder crankcase defining a cylinder closed at one end by a valve plate provided with at least one discharge orifice operationally associated with at least one discharge valve, and defining, with the cylinder, a compression chamber; a cylinder cap having a gas outlet and an end wall opposed and seated to the valve plate in opposition to the compression chamber and inside which is defined a discharge chamber; a discharge tube communicating the gas outlet of the cylinder cap with an exterior of the compressor, the system being characterized in that it comprises a hollow body defining at least one plenum in its interior and mounted in an interior of the cylinder cap and maintaining, with the latter, a gap, said hollow body comprising: a base end wall to be seated against the valve plate in order to secure the at least one discharge valve within the valve plate, and to stop the at least one discharge valve, said base end wall preventing the direct contact of the valve plate with an internal volume of the hollow body, and provided with an inlet nozzle open to the discharge orifice of the valve plate; and a top end wall provided with an outlet nozzle comprising an outer tubular projection to be fitted in a tubular passage formed internally to the end wall of the cylinder cap, the outlet nozzle, its outer tubular projection and the tubular passage being open to the gas outlet of the cylinder cap,
wherein the base end wall inlet nozzle includes an annular region surrounding a base opening, the annular region is inclined radially inwards and axially inwards of the hollow body.

2. The system, as set forth in claim 1 , characterized in that the inlet nozzle of the hollow body comprises the base opening, provided in the base end wall, and the annular region forms a tubular projection which extends from the base end wall to the interior of the hollow body, around the base opening.

3. The system, as set forth in claim 1 , characterized in that the outer tubular projection extends outwards of a lowered region provided in the top end wall of the hollow body, with the tubular passage being defined in the interior of the end wall.

4. The system, as set forth in claim 1 , characterized in that it comprises a biasing means provided between the top end wall and the end wall of the cylinder cap and elastically forcing the hollow body against the valve plate.

5. The system, as set forth in claim 4 , characterized in that the biasing means is defined by a plate spring.

6. The system, as set forth in claim 5 , characterized in that the top end wall incorporates a plurality of top projections facing out of the hollow body, with the plate spring presenting opposite ends, each being fitted in a respective top projection of the top end wall of the hollow body.

7. The system, as set forth in claim 1 , characterized in that the hollow body is formed in two parts, one incorporating the base end wall and the other incorporating the top end wall, said parts being seated against a common dividing wall which divides the plenum of the hollow body into a first and a second discharge chamber, said dividing wall presenting at least one opening communicating both discharge chambers.

8. The system, as set forth in claim 7 , characterized in that the opening of the dividing wall comprises at least one tube projecting into the first discharge chamber, through a straight section eccentric in relation to the inlet nozzle, and into the second discharge chamber, through an arcuate section defining an acoustic attenuator.

9. The system, as set forth in claim 1 , characterized in that the hollow body is formed from a thermal insulating material.

10. A refrigeration compressor, characterized in that it comprises a thermal insulation system for the discharge of gas, as defined in claim 1 .

Assignees

• Whirlpool Sa

Inventors

• Lilie Dietmar Erich Bernhard

Classifications

• F04B39/064

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• F04B39/0027

  Pulsation and noise damping means · CPC title

• F04B53/001

  Noise damping · CPC title

• F04B39/0061

  using muffler volumes · CPC title

• F04B39/121

  Casings · CPC title