Scroll compressor with tilting slider block

Patent metadata

Field	Value
Publication number	US-9920762-B2
Application number	US-201213428036-A
Country	US
Kind code	B2
Filing date	Mar 23, 2012
Priority date	Mar 23, 2012
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A scroll compressor that includes a housing and scroll compressor bodies disposed in the housing. The scroll bodies include a first scroll body and a second scroll body. The first and second scroll bodies have respective bases and respective scroll ribs that project from the respective bases. Further, the scroll ribs mutually engage such that the second scroll body is movable relative to the first scroll body to compress fluid. A drive shaft has an eccentric drive pin configured to engage a drive hub on the second scroll body. The scroll compress also includes a slider block that fits over the drive pin. The slider block has a first drive surface configured to engage a second drive surface of the drive pin. In particular embodiments, the slider block can tilt about one or more edges of the second drive surface when the drive shaft is deflected under load.

First claim

What is claimed is:

1. A scroll compressor comprising:
a housing;
a drive shaft;
an eccentric drive pin;
scroll compressor bodies disposed in the housing, the scroll bodies including a first scroll body and a second scroll body, the first and second scroll bodies having respective bases and respective scroll ribs that project from the respective bases, wherein the scroll ribs mutually engage, the second scroll body being movable relative to the first scroll body for compressing fluid;
a drive unit configured to rotate the drive shaft to drive the second scroll body in an orbital path, the drive shaft having the eccentric drive pin configured to engage a drive hub on the second scroll body; and
a slider block that fits over the drive pin and provides radial compliance of the second scroll body, the slider block having a first drive surface configured to engage a second drive surface of the eccentric drive pin, wherein the first drive surface is substantially flat, and wherein the second drive surface is substantially flat and raised with respect to an exterior surface portion of the drive pin, the second drive surface having a length that is shorter than the overall length of the eccentric drive pin, such that the slider block tilts about one or more edges of the second drive surface when the drive shaft is deflected under load.

2. The scroll compressor of claim 1 , wherein the length of the second drive surface is 25% to 50% of the overall drive pin length.

3. The scroll compressor of claim 1 , wherein the second drive surface is generally rectangular.

4. The scroll compressor of claim 1 , wherein the slider block includes a cylindrical exterior surface and an opening defined by an interior surface, the interior surface having two rounded portions and two flat portions.

5. The scroll compressor of claim 4 , wherein the two flat portions are both rectangular and comprise a first flat portion and a second flat portion, wherein the first flat portion has a length equal to that of the second flat portion, the first flat portion being wider than the second flat portion.

6. The scroll compressor of claim 5 , wherein the first flat portion abuts a flat portion of the drive pin.

7. The scroll compressor of claim 5 , wherein the second flat portion functions to locate the slider block in a set position with respect to the drive pin.

8. The scroll compressor of claim 1 , wherein the slider block includes a chamfered surface extending axially from one end of the slider block, wherein axially means along a longitudinal axis of the drive shaft, the chamfered surface having one or more notched openings to prevent the trapping of gas between the slider block and the shaft.

9. The scroll compressor of claim 1 , wherein the second drive surface is located on a central portion of the drive pin with respect to the overall length of the drive pin, wherein the second drive surface is on the exterior surface portion of the drive pin and between opposed ends of the drive pin.

10. The scroll compressor of claim 9 , wherein portions of the drive pin on either side of the central portion are not raised.

11. A method of providing radial compliance for the second scroll body in a scroll compressor, the method comprising:
configuring a slider block to assemble onto a drive pin eccentrically located at one end of a drive shaft, the drive pin having an exterior drive surface that is substantially flat and raised with respect to an exterior surface of the drive pin to engage a substantially flat drive surface of the slider block, wherein the exterior raised drive surface has a shorter length than the overall length of the drive pin such that the slider block tilts back and forth on respective edges of the exterior raised drive surface where the edges engage the slider block;
assembling the slider block onto the drive pin; and
assembling a movable scroll member onto the slider block, the movable scroll member having a cylindrical hub configured to receive the slider block.

12. The method of claim 11 , wherein the length of the exterior raised drive surface is between 25% and 50% of the overall drive pin length.

13. The method of claim 11 , wherein the exterior drive surface is generally rectangular.

14. The method of claim 11 , wherein assembling the slider block to the drive pin comprises assembling a first flat portion of an interior surface of the slider block to a corresponding flat portion of the drive pin.

15. The method of claim 14 , wherein assembling the slider block to the drive pin further comprises assembling the slider block having a second flat portion configured to locate the slider block in a set position with respect to the drive pin.

16. The method of claim 11 , further comprising assembling a sleeve between the slider block and the cylindrical hub of the movable scroll member.

17. The method of claim 11 , wherein assembling the slider block to the drive pin comprises assembling the slider block having a cylindrical exterior surface.

18. The method of claim 17 , wherein assembling the slider block to the drive pin comprises assembling the slider block having a chamfered surface extending axially from one end of the slider block, the chamfered surface having one or more notched openings to prevent the trapping of gas beneath the slider block.

19. A scroll compressor comprising:
a housing;
a drive shaft;
an eccentric drive pin;
scroll compressor bodies disposed in the housing, the scroll bodies including a first scroll body and a second scroll body, the first scroll body and the second scroll body having respective bases and respective scroll ribs that project from the respective bases, wherein the scroll ribs mutually engage, the second scroll body being movable relative to the first scroll body for compressing fluid;
a drive unit configured to rotate the drive shaft to drive the second scroll body in an orbital path, the drive shaft having the eccentric drive pin configured to engage a drive hub on the second scroll body; and
a slider block that fits over the eccentric drive pin and provides radial compliance of the second scroll body, the slider block having a first drive surface that is substantially flat and raised with respect to the generally smooth interior surface of the slider block to engage a second drive surface of the drive pin, wherein the second drive surface is substantially flat, the first drive surface having a length that is shorter than the overall length of the eccentric drive pin, such that the slider block tilts about one or more edges of the first drive surface when the drive shaft is deflected under load;
wherein the slider block includes a cylindrical exterior surface and an opening defined by a generally smooth interior surface, the generally smooth interior surface having two rounded portions and two at least partially flat portions, and wherein the first drive surface is located on a central portion of one of the two at least partially flat portions.

20. The scroll compressor of claim 19 , wherein the length of the first drive surface is 25% to 75% of the overall slider block length.

21. The scroll compressor of claim 19 , wherein the two at least partially flat portions are both rectangular and comprise a first flat portion and a second flat portion, wherein the first flat portion has a length equal to that of the second flat portion, the first flat portion being wider than the second flat portion.

Assignees

• Bush James W
• Duppert Ronald J
• Bitzer Kuehlmaschinenbau Gmbh

Inventors

• Bush James W
• Duppert Ronald J

Classifications

• F04C2230/603

  Centering; Aligning · CPC title

• F04C29/0057

  for eccentric movement · CPC title

• Y10T29/4924

  Scroll or peristaltic type · CPC title

• F04C2240/60

  Shafts · CPC title

• F01C21/007

  General arrangements of parts; Frames and supporting elements · CPC title