Gas discharge system for a refrigeration compressor and a refrigeration compressor

Patent metadata

Field	Value
Publication number	US-10227975-B2
Application number	US-201314432883-A
Country	US
Kind code	B2
Filing date	Aug 2, 2013
Priority date	Oct 3, 2012
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

A compressor includes a cylinder crankcase defining a cylinder which is closed by a valve plate provided with at least one discharge orifice associated with a discharge valve and defining, with the cylinder, a compression chamber; a cylinder cap seated against the valve plate and inside which is defined a discharge chamber. A portion of the cylinder cap is dimensioned to receive the entire flow of refrigerant gas released through the discharge orifice and accelerate said gas flow so as to produce an instantaneous reduction in the pressure gradient between the upstream and downstream sides of the discharge valve, in the moment the latter opens.

First claim

The invention claimed is:

1. A gas discharge system for a refrigeration compressor of the type which comprises: a cylinder crankcase defining a cylinder which is closed, at one end, by a valve plate provided with at least one discharge orifice and defining, with the cylinder, one compression chamber; a cylinder cap having a gas outlet and being seated against the valve plate in opposition to the compression chamber and in whose interior is defined a discharge chamber, the valve plate being operationally associated with at least one discharge valve, said system being characterized in that it comprises an accelerating means mounted in an interior of the discharge chamber and secured to at least one of the parts of cylinder cap and the valve plate, the accelerating means positioned to receive an entire flow of refrigerant gas released by the discharge valve through the discharge orifice, the accelerating means configured to accelerate said refrigerant gas flow by providing an inlet nozzle having a base opening open to and larger than the discharge orifice communicating said discharge orifice with the discharge chamber and a tubular conduit defining an opening larger than the base opening and causing an instantaneous reduction in a pressure gradient between an upstream and a downstream side of the discharge valve, in a moment the latter opens; wherein the cylinder cap further comprises a base end wall seated against the valve plate; in which the discharge valve comprises at least one flexible blade, in that the base end wall comprises an annular region, defined around the base opening of the inlet nozzle and defining a stop for the maximum opening of the flexible blade of the discharge valve, wherein a portion of the base end wall retains the discharge valve in its position in the valve plate; wherein the annular region of the base wall is inclined radially inwards and axially inwards in the interior of the discharge chamber, defining an inclined opening stop, against which is seated the flexible blade upon a maximum opening of the discharge valve.

2. The system, as set forth in claim 1 , characterized in that the tubular conduit has a cylindrical or inverted frusto-conical shape which projects to the interior of the discharge chamber, from the discharge orifice of the valve plate.

3. The system, as set forth in claim 2 , provided with the inlet nozzle comprising the base opening, open to the discharge orifice of the valve plate and said tubular conduit being incorporated, in a single piece, to the base end wall and defining an extension of the inlet nozzle to the interior of the discharge chamber.

4. The system, as set forth in claim 3 , characterized in that said annular region of the base end wall, which acts against the flexible blade of the discharge valve is constructed in order to be axially spaced from the valve plate, defining an opening stop for the flexible blade of the discharge valve.

5. The system, as set forth in claim 3 , further comprising a hollow body defining at least one plenum therein and which is mounted, in an indexed manner, in the interior of the cylinder cap, maintaining with the latter a gap, said hollow body comprising the base end wall preventing the direct contact of the valve plate with the inner volume of the hollow body, the inlet nozzle of the base end wall communicating the plenum with the discharge orifice of the valve plate.

6. The system, as set forth in claim 5 , characterized in that the hollow body is formed in two parts, wherein one of the two parts incorporates the base end wall and the other of the two parts incorporates the top end wall, said two 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.

7. The system, as set forth in claim 6 , characterized in that the opening of the dividing wall comprises at least one tube projecting to the interior of the first discharge chamber, through a straight section eccentric in relation to the inlet nozzle, and to the interior of the second discharge chamber, through an arcuate section defining an acoustic muffler.

8. The system, as set forth in claim 1 , in which the cylinder cap is provided with an end wall opposite to the valve plate, said system being characterized in that a hollow body comprises a top end wall in which is provided an outlet nozzle of the hollow body, said outlet nozzle being open to the gas outlet of the cylinder cap.

9. The system, as set forth in claim 8 , characterized in that the outlet nozzle of the hollow body comprises an outer tubular projection provided in the top end wall of the hollow body, in order to be fitted in a tubular passage formed internally to the end wall and which is open to the outlet nozzle of the cylinder cap.

10. The system, as set forth in claim 9 , characterized in that the outer tubular projection extends to the outside of a lowered region provided on the top end wall of the hollow body.

11. The system, as set forth in claim 8 , characterized in that it comprises a plate spring, located between the top end wall and the end wall of the cylinder cap and elastically forcing the hollow body against the valve plate.

12. The system, as set forth in claim 11 , characterized in that the top end wall incorporates a plurality of top projections facing outside the hollow body, the plate spring presenting opposite ends, each being fitted into a respective top projection of the top end wall of the hollow body.

13. A gas discharge system for a refrigeration compressor of the type which comprises: a cylinder crankcase defining a cylinder which is closed, at one end, by a valve plate provided with at least one discharge orifice and defining, with the cylinder, one compression chamber; a cylinder cap having a gas outlet and being seated against the valve plate in opposition to the compression chamber and in whose interior is defined a discharge chamber, the valve plate being operationally associated with at least one discharge valve, said system being characterized in that it comprises an accelerating means mounted in an interior of the discharge chamber and secured to at least one of the parts of cylinder cap and the valve plate, the accelerating means positioned to receive an entire flow of refrigerant gas released by the discharge valve through the discharge orifice, the accelerating means configured to accelerate said refrigerant gas flow by providing an inlet nozzle having a base opening open to and larger than the discharge orifice communicating said discharge orifice with the discharge chamber and a tubular conduit defining an opening larger than the base opening and causing an instantaneous reduction in a pressure gradient between an upstream and a downstream side of the discharge valve, in a moment the latter opens; wherein the cylinder cap further comprises a base end wall seated against the valve plate; in which the discharge valve comprises at least one flexible blade, in that the base end wall comprises an annular region, defined around the base opening of the inlet nozzle and defining a stop for the maximum opening of the flexible blade of the discharge valve, wherein a portion of the base end wall retains the discharge valve in its position in the valve plate; wherein the annular region of the base wall is inclined radially inwards and axially inwards in the interior of the discharge chamber, defining an inclined opening stop, against which is seated the flexible blade upon a maximum opening of the discharge valve;
wherein the tubular conduit has a cylindrical or inverted frusta-conica

Assignees

• Whirlpool Sa

Inventors

• Lilie Dietmar Erich Bernhard
• Wajczyk Talita

Classifications

• F04B39/064

  Cooling by a cooling jacket in the pump casing · CPC title

• F04B53/001

  Noise damping · CPC title

• F04B39/0055 Primary

  with a special shape of fluid passage, e.g. bends, throttles, diameter changes, pipes · CPC title

• F04B39/06

  Cooling; Heating; Prevention of freezing · CPC title

• F04B39/0027

  Pulsation and noise damping means · CPC title