Compressor including biasing passage located relative to bypass porting

Patent metadata

Field	Value
Publication number	US-9267501-B2
Application number	US-201213453491-A
Country	US
Kind code	B2
Filing date	Apr 23, 2012
Priority date	Sep 22, 2011
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A compressor may include a first scroll member, a second scroll member and a seal engaged with the second scroll member. The first scroll member may include a first end plate having a first spiral wrap extending therefrom. The second scroll member may be supported relative to the first scroll member and may include a second end plate having a second spiral wrap extending therefrom and meshingly engaged with said first spiral wrap. The second end plate may define a discharge port, bypass porting and a biasing passage. The biasing passage may be in communication with the bypass porting during a portion of a compression cycle of the compressor. The seal and the second scroll member may define an axial biasing chamber in communication with the biasing passage.

First claim

What is claimed is:

1. A compressor comprising:
a first scroll member including a first end plate having a first spiral wrap extending therefrom;
a second scroll member supported relative to said first scroll member and including a second end plate having a second spiral wrap extending therefrom and meshingly engaged with said first spiral wrap, said second end plate defining a discharge port, bypass porting and a biasing passage, said biasing passage being in communication with said bypass porting during a portion of a compression cycle of the compressor, said biasing passage located at least 270 degrees outward from said bypass porting along said second spiral wrap; and
a seal engaged with said second scroll member, said seal and said second scroll member defining an axial biasing chamber in communication with said biasing passage,
wherein said first and second spiral wraps initially define an intermediate pocket at a suction seal-off condition and progressively compress fluid within said intermediate pocket during compressor operation until said intermediate pocket is in communication with said discharge port, said intermediate pocket being in communication with said bypass porting no earlier than an angle α of orbital displacement of said first scroll member relative to said second scroll member defined by:

α
=

(

1
-

1
VR

)

⁢

(

Φ
-

R
or

2
⁢

R
g

)

⁢

(

180
π

)

;

where VR is a volume ratio of the compressor defined by said bypass porting, R or is radius of first spiral wrap orbiting motion, R g is a base circle radius defining an involute curve of said second spiral wrap and is defined by:

R
g

=

T
-

R
or

π

;

where T is thickness of said second spiral wrap, Φ is an angle indicative of second spiral wrap length and is defined by:

Φ
=

1
2

⁢

(

L

R
g

-
π

)

;

where L is a maximum distance defined between inner radial surfaces of said second spiral wrap.

2. The compressor of claim 1 , wherein said bypass porting includes a first bypass port defining a radially outermost bypass port, initial communication between said intermediate pocket and said bypass porting including said first bypass port being in communication with said intermediate pocket after orbital displacement of said first scroll member relative to said second scroll member by at least said angle α from said suction seal-off condition.

3. The compressor of claim 2 , wherein said biasing passage is located no more than said angle α minus 270 degrees inward along an outer radial surface of said second spiral wrap from where said intermediate pocket is formed at said suction seal-off condition.

4. The compressor of claim 2 , wherein said biasing passage is located no more than said angle α minus 270 degrees inward along an inner radial surface of said second spiral wrap from where said intermediate pocket is formed at said suction seal-off condition.

5. A compressor comprising:
a first scroll member including a first end plate having a first spiral wrap extending therefrom;
a second scroll member supported relative to said first scroll member and including a second end plate having a second spiral wrap extending therefrom, said second end plate defining a discharge port, bypass porting and a biasing passage and said second spiral wrap is meshingly engaged with said first spiral wrap to initially define an intermediate pocket at a suction seal-off condition of said first and second spiral wraps, said intermediate pocket being progressively compressed during compressor operation and being in communication with said bypass porting no earlier than an angle α of orbital displacement of said first scroll member relative to said second scroll member defined by:

α
=

(

1
-

1
VR

)

⁢

(

Φ
-

R
or

2
⁢

R
g

)

⁢

(

180
π

)

;

where VR is volume ratio defined by said bypass porting, R or is radius of first spiral wrap orbiting motion, R g is a base circle radius defining an involute curve of said second spiral wrap and is defined by:

R
g

=

T
-

Assignees

• Akei Masao
• Emerson Climate Technologies

Inventors

• Akei Masao

Classifications

• F04C29/126

  of the non-return type · CPC title

• F04C18/0261 Primary

  Details of the ports, e.g. location, number, geometry · CPC title

• F04C28/26

  using bypass channels · CPC title

• F04C27/005

  Axial sealings for working fluid · CPC title

• F04C18/0215

  where only one member is moving · CPC title