Scroll refrigeration compressor with a delivery valve and a bypass valve

Patent metadata

Field	Value
Publication number	US-9194395-B2
Application number	US-201113700937-A
Country	US
Kind code	B2
Filing date	May 16, 2011
Priority date	Jun 2, 2010
Publication date	Nov 24, 2015
Grant date	Nov 24, 2015

Abstract

A compressor including: a stationary volute and a moving volute each including a plate provided with a scroll, said scrolls defining variable-volume compression chambers; a delivery line provided in the plate of the stationary volute; a delivery port arranged such as to establish a communication between the delivery line and a delivery chamber; and a non-return device including (i) a valve seat surrounding the delivery port and (ii) a delivery valve which can move between delivery port opening and closing positions. The compressor includes: at least one bypass passage having a first end opening into the delivery line at a point between the central compression chamber and the valve seat and a second end opening into an intermediate compression chamber or into a low-pressure portion of the compressor, and at least one bypass valve which can move between bypass passage closing and opening positions.

First claim

The invention claimed is:

1. A scroll refrigeration compressor comprising:
a stationary volute and a moving volute having an orbital movement, the stationary volute and the moving volute each including a plate from which extends a scroll, the scrolls of the stationary and moving volutes being engaged with each other and delimiting a plurality of variable-volume compression chambers,
a delivery chamber,
a delivery line in a central portion of the plate of the stationary volute including a first end that opens into a central compression chamber and a second end configured to communicate with the delivery chamber,
an anti-return device including:
a valve plate including at least one delivery port configured to communicate between the delivery line and the delivery chamber,
a valve seat on the valve plate, the valve seat surrounding the delivery port, and
a delivery valve moveable between an obturation position in which the delivery valve bears against the valve seat and obturates the delivery port, and a release position in which the delivery valve is away from the valve seat and clears the delivery port, the delivery valve being configured to be displaced into the release position when the pressure in the delivery line exceeds the pressure in the delivery chamber by a first predetermined value,

a first bypass passage including a first end that opens into the delivery line at a location located between the central compression chamber and the valve seat, and a second end that opens into an intermediate compression chamber, the first bypass passage including:
a bypass recess in a surface of the valve plate of the anti-return device turned towards the side of the plate of the stationary volute, the bypass recess opening into the delivery line, and
a bypass channel facing the bypass recess, the bypass channel including a first channel end that opens into the corresponding intermediate compression chamber, and a second channel end that opens into a surface of the plate of the stationary volute turned towards the side of the valve plate of the anti-return device, the second channel end of the bypass channel facing the bypass recess of the first bypass passage, and

a first bypass valve moveable between an obturation position in which the first bypass valve obturates the first bypass passage to prevent the delivery line from communicating with the intermediate compression chamber into which opens the bypass passage, and a release position in which the first bypass valve clears the first bypass passage so that the delivery line communicates with the intermediate compression chamber into which opens the first bypass passage, the first bypass valve being configured to be displaced into the release position when the pressure in the intermediate compression chamber into which opens the first bypass passage exceeds the pressure in the delivery line by a second predetermined value.

2. The scroll refrigeration compressor according to claim 1 , further comprising:
a second bypass passage including a first end that opens into the delivery line at a location located between the central compression chamber and the valve seat, and a second end that opens into a suction pressure portion of the scroll refrigeration compressor, and
a second bypass valve configured to move between an obturation position in which the second bypass valve obturates the second bypass passage to prevent the delivery line from communicating with the suction pressure portion of the scroll refrigeration compressor, and a release position in which the second bypass valve clears the second bypass passage so that the delivery line communicates with the suction pressure portion of the scroll refrigeration compressor, the second bypass valve being configured to be displaced into the release position when the pressure in the suction pressure portion of the scroll refrigeration compressor exceeds the pressure in the delivery line by the second predetermined value.

3. The scroll refrigeration compressor according to claim 2 , wherein the second bypass passage includes:
a bypass recess in the surface of the valve plate of the anti-return device turned towards the side of the plate of the stationary volute, the bypass recess opening into the delivery line, and
a bypass channel including a first channel end that opens into the suction pressure portion and a second channel end that opens into the surface of the plate of the stationary volute turned towards the side of the valve plate of the anti-return device, the second channel end facing the bypass recess of the second bypass passage.

4. The scroll refrigeration compressor according to claim 3 , further comprising:
a valve-holder plate positioned between the valve plate of the anti-return device and the plate of the stationary volute, the valve-holder plate including the second bypass valve made with the valve-holder plate in the same material and formed as a strip configured to elastically deform between: (i) an obturation position in which the strip obturates the first channel end of the bypass channel of the second bypass passage, and (ii) a release position in which the strip clears the first channel end of the bypass channel of the second bypass passage.

5. The scroll refrigeration compressor according to claim 3 , wherein a bottom of the bypass recess of the second bypass passage forms an abutment surface configured to limit the movement range of the second bypass valve towards the release position.

6. The scroll refrigeration compressor according to claim 1 , wherein the first bypass passage includes a bypass line that includes:
a first end that opens into the corresponding intermediate compression chamber, and
a second end that opens into the delivery line.

7. The scroll refrigeration compressor according to claim 1 , wherein the first bypass valve is formed as a strip that is elastically deformable between an obturation position in which the strip obturates the first bypass passage, and a release position in which the strip clears the first bypass passage.

8. The scroll refrigeration compressor according to claim 1 , further comprising:
a valve-holder plate positioned between the valve plate of the anti-return device and the plate of the stationary volute, the valve-holder plate including the first bypass valve made with the valve-holder plate in the same material and formed as a strip configured to elastically deform between: (i) an obturation position in which the strip obturates the first channel end of the bypass channel and (ii) a release position in which the strip obturates the first channel end of the bypass channel.

9. The scroll refrigeration compressor according to claim 8 , wherein a bottom of the bypass recess forms an abutment surface configured to limit the movement range of the first bypass valve towards the release position.

10. The scroll refrigeration compressor according to claim 1 , further comprising an abutment member configured to limit the movement range of the delivery valve and/or of the first bypass valve towards the release position.

11. The scroll refrigeration compressor according to claim 1 , further comprising a separation plate mounted on the plate of the stationary volute so as to surround the delivery line, the separation plate at least partially delimiting the delivery chamber.

Assignees

• Ginies Pierre
• Ancel Christophe
• Danfoss Commercial Compressors

Inventors

• Ginies Pierre
• Ancel Christophe

Classifications

• F04C18/0215 Primary

  where only one member is moving · CPC title

• F04C28/26

  using bypass channels · CPC title

• F04C18/0246

  Details concerning the involute wraps or their base, e.g. geometry · CPC title

• F04C29/126

  of the non-return type · CPC title

• F04C29/128 Primary

  of the elastic type, e.g. reed valves · CPC title