U.S. patent application number 11/090171 was filed with the patent office on 2006-09-28 for back-gap controlling apparatus for compressor.
This patent application is currently assigned to Chyn Tec.International Co., Ltd. Invention is credited to Chih-Chao Hung, Chien-Chih Kao, Chung-Hung Yeh.
Application Number | 20060216179 11/090171 |
Document ID | / |
Family ID | 37035374 |
Filed Date | 2006-09-28 |
United States Patent
Application |
20060216179 |
Kind Code |
A1 |
Kao; Chien-Chih ; et
al. |
September 28, 2006 |
Back-gap controlling apparatus for compressor
Abstract
A back-gap controlling apparatus for compressor is proposed to
reduce an initial torque for the motor of a compressor. A high
pressure between the two scroll units of the compressor can
temporarily separate the two scroll units. The casing pro se or a
sealing buffer can be used to limit a displacement amount of the
scroll unit The excessive displacement of scroll unit can be
prevented to enhance lifetime of motor.
Inventors: |
Kao; Chien-Chih; (Sijhih
City, TW) ; Yeh; Chung-Hung; (Sijhih City, TW)
; Hung; Chih-Chao; (Sijhih City, TW) |
Correspondence
Address: |
HDSL
4331 STEVENS BATTLE LANE
FAIRFAX
VA
22033
US
|
Assignee: |
Chyn Tec.International Co.,
Ltd
|
Family ID: |
37035374 |
Appl. No.: |
11/090171 |
Filed: |
March 28, 2005 |
Current U.S.
Class: |
418/55.1 ;
418/55.2; 418/55.5; 418/55.6 |
Current CPC
Class: |
F04C 28/06 20130101;
F04C 27/005 20130101 |
Class at
Publication: |
418/055.1 ;
418/055.2; 418/055.5; 418/055.6 |
International
Class: |
F01C 1/02 20060101
F01C001/02; F04C 2/00 20060101 F04C002/00; F01C 1/063 20060101
F01C001/063 |
Claims
1. A back-gap controlling apparatus for a compressor, comprising: a
casing comprising an accommodation space therein; an orbital scroll
arranged in the accommodation space; and a fixed scroll arranged in
the accommodation space and engaged with the orbital scroll;
wherein a compressed fluid pressure due to an operation between the
orbital scroll and the fixed scroll will push the fixed scroll away
from the orbital scroll; and wherein an abutting section to limit a
displacement amount of the fixed scroll is provided between the
casing and the fixed scroll.
2. The back-gap controlling apparatus for the compressor as in
claim 1, wherein the casing comprises a first shell and a second
shell connected to a bottom of the first shell and a floating oil
seal is provided atop the fixed scroll.
3. The back-gap controlling apparatus for the compressor as in
claim 2, wherein an inner diameter of the first shell is equivalent
to an inner diameter of the second shell, the abutting section is a
baffle plate arranged within the first shell and placed atop the
fixed scroll and the floating oil seal.
4. The back-gap controlling apparatus for the compressor as in
claim 2, wherein an inner diameter of the first shell is smaller
than an inner diameter of the second shell, the abutting section is
a baffle plate arranged within the first shell and placed atop the
fixed scroll and the floating oil seal.
5. The back-gap controlling apparatus for the compressor as in
claim 2, wherein an inner diameter of the first shell is smaller
than an inner diameter of the second shell, the abutting section is
directly formed on bottom peripheral of the first casing.
6. The back-gap controlling apparatus for the compressor as in
claim 5, further comprising a sealing buffer at a junction between
a first shell and a second shell.
7. The back-gap controlling apparatus for the compressor as in
claim 6, wherein the sealing buffer is of annulus shape and has an
inner diameter the same as an inner diameter of the first
shell.
8. The back-gap controlling apparatus for the compressor as in
claim 6, wherein the sealing buffer is of annulus shape and has an
inner diameter the same as an inner diameter of the second
shell.
9. The back-gap controlling apparatus for the compressor as in
claim 6, wherein the sealing buffer is of annulus shape and has an
inner diameter smaller than an inner diameter of the first shell
and larger than an inner diameter of the second shell.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a back-gap controlling
apparatus for a compressor, and more particularly to back-gap
controlling apparatus for a compressor to temporarily separate two
scroll units of the compressor, thus reducing initial torque to
operate the motor and limiting a displacement amount of scroll
unit.
[0002] The scroll compressor generally comprises two scroll units
in spiral shape, wherein one scroll unit is fixed and referred to
as fixed scroll, and another scroll unit has rotational movement
with respect to the fixed scroll and is referred to as orbital
scroll. The two scroll units are engaged each other and have
180-degree phase difference.
[0003] The orbital scroll has rotation around the fixed scroll,
thus forming closed space therebetween. A working fluid is shrunk,
within the closed space, from peripheral to center, and then
ejected out of the two scroll units. In this way, the compression
stroke is provided.
[0004] In above-mentioned operation, the orbital scroll is driven
by a driving member. It is well known that a static friction
coefficient is larger than a dynamic friction coefficient for
moving a body. Therefore, a larger force is required to move the
orbital scroll. The driving member requires large torque to
overcome a static friction between the orbital scroll and the
static scroll. The driving member has risk of damage and the
lifetime of the driving member is reduced.
SUMMARY OF THE INVENTION
[0005] The present invention provides a back-gap controlling
apparatus for compressor to prevent an excessive displacement
amount of the orbital scroll and the fixed scroll of the compressor
and to prevent fluid leakage.
[0006] Accordingly, the present invention provides a back-gap
controlling apparatus for compressor. The back-gap controlling
apparatus comprises a casing comprising an accommodation space
therein; an orbital scroll arranged in the accommodation space; and
a fixed scroll arranged in the accommodation space and engaged with
the orbital scroll. A compressed fluid pressure due to an operation
between the orbital scroll and the fixed scroll will push the fixed
scroll away from the orbital scroll. An abutting section to limit a
displacement amount of the fixed scroll is provided between the
casing and the fixed scroll.
BRIEF DESCRIPTION OF DRAWING
[0007] The features of the invention believed to be novel are set
forth with particularity in the appended claims. The invention
itself however may be best understood by reference to the following
detailed description of the invention, which describes certain
exemplary embodiments of the invention, taken in conjunction with
the accompanying drawings in which:
[0008] FIG. 1 shows a sectional view of the first preferred
embodiment of the present invention.
[0009] FIG. 2 shows the first preferred embodiment of the present
invention before balance.
[0010] FIG. 3 shows the first preferred embodiment of the present
invention after balance.
[0011] FIG. 4 shows a sectional view of the second preferred
embodiment of the present invention.
[0012] FIG. 5 shows a sectional view of the third preferred
embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0013] FIG. 1 shows a sectional view of the first preferred
embodiment of the present invention. The present invention provides
a back-gap controlling apparatus for compressor. The compressor
comprises a casing 10 composed of a first shell 101 and a second
shell 102 below the first shell 101. The inner diameter of the
first shell 101 is equivalent to the inner diameter of the second
shell 102 to define an accommodation space for accommodating other
elements in the compress. An orbital scroll 20 is placed in the
casing and connected to a driving member 40. A fixed scroll 30 is
arranged in the casing 10 and engaged with the orbital scroll 20. A
floating oil seal 70 is provided atop the fixed scroll 30. When the
orbital scroll 20 and the fixed scroll 30 begin to operate, a fluid
pressure generated by compression will push the fixed scroll 30
away from the orbital scroll 20. Moreover, an abutting section 50
is provided between the orbital scroll 20 and the fixed scroll 30
to limit the displacement amount of the fixed scroll 30, thus
providing the back-gap controlling apparatus according to the
present invention. In one preferred embodiment of the present
invention, the abutting section 50 is a baffle plate placed within
the first shell 101 and atop the fixed scroll 30 and the oil seal
70, thus limiting the axial displacement amount of the fixed scroll
30.
[0014] FIGS. 2 and 3 show the first preferred embodiment of the
present invention before and after balance, respectively. The oil
seal 70 can be pushed upward when the driving member 40 is rotated.
At this time, a back pressure chamber 80 is defined by the oil seal
70 and the fixed scroll 30. Moreover, the oil seal 70 and a baffle
plate screwed to the casing 10 will separate a high pressure
chamber 90 and a low pressure chamber 91. When the fixed scroll 30
is pushed away from the orbital scroll 20, the contact area between
the orbital scroll 20 and the fixed scroll 30 can be reduced.
Therefore, the static friction is reduced. As already mentioned, to
move a body in rest state needs larger force in comparison to move
a body in moving state. Therefore, less rotational force is
required to keep an already-moving body in moving status. The body
will achieve rotational balance within shorter time. Because the
fluid pressure will push the fixed scroll 30 away from the orbital
scroll 20, the driving member 40 will fast achieve rotational
balance by less torque.
[0015] Moreover, the fixed scroll 30 is pushed away from the
orbital scroll 20 until the fixed scroll 30 is in contact with the
baffle plate when the compressor begins to operate. This can
prevent excessive displacement of the fixed scroll 30 and pressure
leakage. Afterward, when the driving member 40 achieves rotational
balance, the high-pressure fluid in the back pressure chamber 80
will provide force to push downward the fixed scroll 30. Therefore,
the fixed scroll 30 has downward movement until the fixed scroll 30
is again engaged with the orbital scroll 20, as shown in FIG. 3. In
this situation, friction is still present between the orbital
scroll 20 and the fixed scroll 30. However, the friction is far
smaller than the static friction accounting for rest body because
the driving member 40 is in rotational balance.
[0016] FIG. 4 shows a sectional view of the second preferred
embodiment of the present invention. The second preferred
embodiment is different to the first preferred embodiment in that
the inner diameter of the first shell 101 is smaller than the inner
diameter of the second shell 102. An abutting section 50' of
another type is directly formed on a bottom peripheral of the first
shell 101. Therefore, the abutting section 50' will limit the
displacement of the fixed scroll 30 when the fixed scroll 30 is
pushed away from the orbital scroll 20.
[0017] FIG. 5 shows a sectional view of the third preferred
embodiment of the present invention. The third preferred embodiment
is different to previous preferred embodiments in that a sealing
buffer 60 is provided between the first shell 101 and the second
shell 102. The sealing buffer 60 is of annulus shape and has inner
diameter the same as the inner diameter of either the first shell
101 or the second shell 102. Moreover, the inner diameter of the
sealing buffer 60 can be set between the inner diameter of either
the first shell 101 and the second shell 102. The sealing buffer 60
can buffer a contact between the fixed scroll 30 and the first
shell 101, therefore the operation noise and component abrasion can
be prevented.
[0018] The back-gap controlling apparatus according to the present
invention has following advantages. There is higher pressure
between the orbital scroll and the fixed scroll when the compressor
begins to operate. The pressure will temporarily separate the
orbital scroll and the fixed scroll to reduce contact area between
the orbital scroll and the fixed scroll. Therefore, friction
between the orbital scroll and the fixed scroll can also be
advantageously reduced. The initial torque for operating the
compressor can also be reduced and the driving member can fast
achieve rotational balance. The lifetime of the compressor can be
enhanced. The compressed fluid pressure due to operation between
the orbital scroll and the fixed scroll will push the fixed scroll
away from the orbital scroll and the fixed scroll has axial contact
with the casing. The initial torque for operating the motor can be
reduced and the liquid leakage due to excessive displacement can be
prevented. The lifetime of motor can be enhanced and the excessive
displacement of scroll unit can be prevented.
[0019] Although the present invention has been described with
reference to the preferred embodiment thereof, it will be
understood that the invention is not limited to the details
thereof. Various substitutions and modifications have suggested in
the foregoing description, and other will occur to those of
ordinary skill in the art. Therefore, all such substitutions and
modifications are intended to be embraced within the scope of the
invention as defined in the appended claims.
* * * * *