U.S. patent application number 13/672829 was filed with the patent office on 2013-05-16 for scroll compressor.
The applicant listed for this patent is Yanghee CHO, Kitae JANG, Byeongchul LEE, Junchul OH, Inho WON. Invention is credited to Yanghee CHO, Kitae JANG, Byeongchul LEE, Junchul OH, Inho WON.
Application Number | 20130121866 13/672829 |
Document ID | / |
Family ID | 48280825 |
Filed Date | 2013-05-16 |
United States Patent
Application |
20130121866 |
Kind Code |
A1 |
JANG; Kitae ; et
al. |
May 16, 2013 |
SCROLL COMPRESSOR
Abstract
A scroll compressor is provided. The scroll compressor may
include guide holes formed at one of a wrap portion or a base
portion, and guide pins inserted into the guide holes formed at the
other of the wrap portion or the base portion to couple the wrap
portion and the base portion to each other. Such guide pins and
guide holes may be easily processed to reduce fabrication costs and
reduce or eliminate unstable behavior of the orbiting scroll. As
the guide pins and the guide holes have a circular cross section,
abrasion of the guide pins or the guide holes may be prevented.
Inventors: |
JANG; Kitae; (Seoul, KR)
; WON; Inho; (Seoul, KR) ; OH; Junchul;
(Seoul, KR) ; CHO; Yanghee; (Seoul, KR) ;
LEE; Byeongchul; (Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
JANG; Kitae
WON; Inho
OH; Junchul
CHO; Yanghee
LEE; Byeongchul |
Seoul
Seoul
Seoul
Seoul
Seoul |
|
KR
KR
KR
KR
KR |
|
|
Family ID: |
48280825 |
Appl. No.: |
13/672829 |
Filed: |
November 9, 2012 |
Current U.S.
Class: |
418/55.5 |
Current CPC
Class: |
F04C 18/0215 20130101;
F04C 18/00 20130101; F04C 18/0253 20130101; F04C 27/005
20130101 |
Class at
Publication: |
418/55.5 |
International
Class: |
F04C 18/00 20060101
F04C018/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 9, 2011 |
KR |
10-2011-0116640 |
Claims
1. A scroll compressor, comprising: a case; a fixed scroll
installed in the case; an orbiting scroll installed in the case and
engaged with the fixed scroll, the orbiting scroll comprising: a
wrap portion configured engage the fixed scroll to form compression
chambers therebetween; a base portion coupled to the wrap portion
and configured to be movable towards the fixed scroll to support
the wrap portion; a plurality of guide pins provided at one of the
wrap portion or the base portion, the plurality of guide pins
extending in an axial direction of the wrap portion and the base
portion; and a corresponding plurality of guide holes formed in the
other of the wrap portion or the base portion, the plurality of
guide holes extending in the axial direction of the wrap portion
and the base portion, at positions respectively corresponding to
the plurality of guide pins, such that the plurality of guide pins
are slidably received in the plurality of guide holes; a driving
motor coupled to the base portion and configured to eccentrically
rotate the base portion and the wrap portion; and a main frame
installed in the case and configured to support the base
portion.
2. The scroll compressor of claim 1, wherein each of the plurality
of guide pins has a curved outer circumferential surface, and each
of the plurality of guide holes has a cross-sectional shape
corresponding to its respective guide pin.
3. The scroll compressor of claim 1, further comprising a back
pressure chamber formed between the wrap portion and the base
portion, and in communication with the compression chambers.
4. The scroll compressor of claim 1, further comprising a ring
shaped seal provided between the wrap portion and the base portion,
wherein the back pressure chamber is formed within in a space
defined by the seal.
5. The scroll compressor of claim 1, wherein the base portion
comprises: a boss coupled to a rotation shaft of the driving motor;
and a base flange extending radially outward from the boss, facing
the wrap portion, wherein the back pressure chamber is formed on a
surface of the base flange facing the wrap portion.
6. The scroll compressor of claim 1, wherein the wrap portion
comprises: a wrap flange having a first surface facing the base
portion; and an orbiting wrap extending from a second surface of
the wrap flange, opposite the first surface thereof, and engaged
with a fixed wrap of the fixed scroll; and a back pressure hole
extending through the wrap flange to provide for communication
between the back pressure chamber and the compression chambers.
7. The scroll compressor of claim 6, wherein the back pressure hole
is formed at a position on the wrap flange where a discharge
pressure, and an intermediate pressure between a discharge pressure
and a suction pressure, are applied to the back pressure
chamber.
8. The scroll compressor of claim 7, wherein the back pressure hole
is formed at a point which is greater than a discharge starting
angle and less than the discharge starting angle plus 180
degrees.
9. The scroll compressor of claim 1, further comprising a plurality
of keys integrally formed on one of the wrap portion or the base
portion, and a corresponding plurality of key grooves formed in the
other of the wrap portion or the base portion and respectively
coupled with the plurality of keys.
10. The scroll compressor of claim 1, wherein an interior of the
case is divided into a first space and a second space, the first
and second spaces having different pressures, and wherein the wrap
portion and the base portion are installed in the first space, the
pressure of the first space being lower than that of the second
space.
11. A scroll compressor, comprising: a fixed scroll having a fixed
wrap; and an orbiting scroll having an orbiting wrap that is
engaged with the fixed wrap such that a pair of compression
chambers are formed between the orbiting scroll and the fixed
scroll, wherein the pair of compression chambers move as the
orbiting scroll orbits with respect to the fixed scroll, wherein
the orbiting scroll includes at least a first part and a second
part arranged in an axial direction, and wherein a plurality of
guide pins are formed on one of the first part or the second part,
extending in the axial direction, and a corresponding plurality of
guide holes are formed in the other of the first part or the second
part, extending in the axial direction, and wherein the plurality
of guide pins are slidably received in the plurality of guide holes
to couple the first part and the second part.
12. The scroll compressor of claim 11, wherein each of the
plurality of guide pins has a curved outer circumferential surface,
and each of the plurality of guide holes has a cross-sectional
shape corresponding to its respective guide pin.
13. The scroll compressor of claim 12, further comprising a back
pressure chamber formed between the first and second parts of the
orbiting scroll for receiving refrigerant from the pair of
compression chambers, wherein a geometric center of the back
pressure chamber is eccentric from a geometric center of the
orbiting scroll.
14. The scroll compressor of claim 11, further comprising a ring
shaped seal provided between the first and second parts of the
orbiting scroll, wherein the back pressure chamber is formed within
a periphery of the seal.
15. The scroll compressor of claim 12, further comprising a back
pressure hole formed in one of the first part or the second part,
at a position corresponding to the pair of compression chambers,
wherein the back pressure hole provides for communication between
the back pressure chamber and the pair of compression chambers.
16. The scroll compressor of claim 13, wherein the back pressure
hole is formed at a position where a discharge pressure, and an
intermediate pressure between a discharge pressure and a suction
pressure, are applied to the back pressure chamber.
17. The scroll compressor of claim 14, wherein the back pressure
hole is formed at a point on the orbiting wrap that is greater than
a discharge starting angle and less than the discharge starting
angle plus 180 degrees.
Description
CROSS-REFERENCE TO RELATED APPLICATION(S)
[0001] This application claims priority under 35 U.S.C. .sctn.119
to Korean Application No. 10-2011-0116640 filed on Nov. 9, 2011,
whose entire disclosure is hereby incorporated by reference.
BACKGROUND
[0002] 1. Field
[0003] This relates to a scroll compressor, and particularly, to a
scroll compressor having a separation-type orbiting scroll.
[0004] 2. Background
[0005] A scroll compressor may compress a refrigerant gas by
changing a volume of compression chambers formed by a pair of
scrolls facing each other. When compared with a reciprocating
compressor or a rotary compressor, the scroll compressor may have
higher efficiency, lower vibration and noise, smaller size and
lighter weight.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] The embodiments will be described in detail with reference
to the following drawings in which like reference numerals refer to
like elements wherein:
[0007] FIG. 1 is a sectional view of a scroll compressor according
to an embodiment as broadly described herein;
[0008] FIG. 2 is a partial cutaway view of a mechanical compression
part of the scroll compressor shown in FIG. 1;
[0009] FIG. 3 is a disassembled perspective view of an orbiting
scroll of the scroll compressor shown in FIG. 1;
[0010] FIG. 4 is a sectional view of an orbiting scroll of the
scroll compressor shown in FIG. 1;
[0011] FIGS. 5 to 7 are planar views illustrating operation of the
scroll compressor shown in FIG. 1, and
[0012] FIG. 8 is a sectional view and FIG. 9 is a planar view of a
wrap portion of an orbiting scroll, illustrating the position of a
back pressure chamber of the scroll compressor shown in FIG. 1.
DETAILED DESCRIPTION
[0013] Description will now be given in detail of exemplary
embodiments, with reference to the accompanying drawings. For the
sake of brief description with reference to the drawings, the same
or equivalent components will be provided with the same reference
numbers, and description thereof will not be repeated.
[0014] Scroll compressors may be categorized into a low-pressure
scroll compressors or high-pressure scroll compressors according to
a type of refrigerant is supplied into the compression chambers. In
a low-pressure scroll compressor, refrigerant is indirectly sucked
into compression chambers via an inner space of a casing which is
divided into a suction space and a discharge space. In a
high-pressure scroll compressor, refrigerant is directly sucked
into compression chambers without passing through an inner space of
the casing, and is then discharged to a discharge space in the
inner space of the casing.
[0015] Scroll compressors may be also categorized into tip seal
type or back pressure type scroll compressors according to a
sealing method of the compression chambers. In the tip seal type
scroll compressor, a tip seal is installed at the wrap end of each
scroll, and the tip seal is levitated when the compressor is
driven, causing the levitated tip seal to adhere to a plate portion
of the opposite scroll. In the back pressure type scroll
compressor, a back pressure chamber is formed on a rear surface of
a first scroll, and oil or refrigerant having an intermediate
pressure is guided into the back pressure chamber. Then, the first
scroll is adhered to a second scroll facing the first scroll by
pressure in the back pressure chamber. Generally, the tip seal
method is applied to a low-pressure scroll compressor, whereas the
back pressure method is applied to a high-pressure scroll
compressor.
[0016] The scroll compressor performs an orbit motion with two side
surfaces of an orbiting scroll in an axial direction contacting a
fixed scroll and a main frame, respectively. Precise
manufacture/processing of the orbiting scroll may
minimize/eliminate vibration of the orbiting scroll and minimize
frictional losses. To this end, a bearing surface contacting the
main frame may be processed first, and then a wrap may be
processed. However, this may be relatively time consuming, and the
bearing surface may be damaged when the wrap portion is processed.
Further, design and fabrication of the orbiting scroll may be
relatively complicated due to the shapes of the orbiting scroll and
the fixed scroll, and in particular, the shape and the size of the
wrap portion may be variable according to the capacity of the
compressor.
[0017] Additionally, a frictional force between the bearing surface
of the fixed scroll and the bearing surface of the orbiting scroll
may be variable according to a pressure applied to the back
pressure chamber. Accordingly, in order to prevent refrigerant
leakage and to reduce frictional force, the pressure applied to the
back pressure chamber may be properly maintained. A relatively high
pressure may be applied to the back pressure chamber, because the
orbiting scroll of the scroll compressor is supported by the
pressure in the back pressure chamber. Further, when the pressure
in the back pressure chamber is varied, sealing performance between
the orbiting scroll and the fixed scroll may be consistent.
Especially, the pressure in the back pressure chamber may be
influenced by a discharge pressure, and the discharge pressure may
vary according to a load applied to the compressor. Therefore, a
sealing function and frictional loss between the orbiting scroll
and the fixed scroll may be influenced by the change of a load
applied to the compressor.
[0018] As shown in FIGS. 1 to 3, a scroll compressor as embodied
and broadly described herein may include a case 1 having an inner
space divided into a suction space 11 (low pressure part) and a
discharge space 12 (high pressure part), a driving motor 2 for
providing a rotational force to the suction space 11 of the case 1,
and a main frame 3 fixedly-installed between the suction space 11
and the discharge space 12 of the case 1.
[0019] A fixed scroll 4 is fixedly-installed on an upper surface of
the main frame 3. An orbiting scroll 5, which forms a pair of
compression chambers (P) that consecutively move together with the
fixed scroll 4 by being eccentrically-coupled to a crank shaft 23
of the driving motor 2, is installed between the main frame 3 and
the fixed scroll 4 so as to perform an orbiting motion. An Oldham's
ring 6 for preventing rotation of the orbiting scroll 5 may be
installed between the main frame 3 and the orbiting scroll 5.
[0020] A suction pipe 13 may be coupled to the suction space 11 of
the case 1 so as to be communicated therewith, and a discharge pipe
14 may be coupled to the discharge space 12 so as to be
communicated therewith. As discussed above, the inner space of the
case 1 may be divided into a suction space (low pressure part) and
a discharge space (high pressure part), in certain embodiments by a
discharge plenum forming the sealed discharge space 12 and
fixedly-coupled to the fixed scroll 4. Alternatively, the inner
space of the case 1 may be divided into a suction space and a
discharge space by a high-low pressure separation plate fixed to an
upper surface of the fixed scroll 4 and adhered to an inner
circumferential surface of the case 1.
[0021] The fixed scroll 4 may be provided with a fixed wrap 42
protruding from a corresponding surface of a plate portion 41 and
formed in an involute shape so as to form the compression chambers
(P) together with an orbiting wrap 52 protruding from a wrap
portion 50 of the orbiting scroll 5. A suction opening may be
formed on an outer circumferential surface of the plate portion 41
of the fixed scroll 4, so that the suction space 11 of the case 1
may communicate with the compression chambers (P). A discharge
opening 44 may be formed at a central part of the plate portion 41
of the fixed scroll 4, so that the discharge space 12 of the case 1
may communicate with the compression chambers (P).
[0022] The scroll compressor may also include a sub-frame 7, a
discharge valve 8, a stator 21 and a rotor 22.
[0023] In a scroll compressor as embodied and broadly described
herein, refrigerant may be introduced into the suction space 11
(low pressure part) of the case 1 through the suction pipe 13 from
a refrigerating cycle. Then, the low-pressure refrigerant in the
suction space 11 is introduced into the compression chambers
through the suction opening of the fixed scroll 4, and moves to a
central part of the orbiting scroll 5 and the fixed scroll 4 by the
orbiting scroll 5. Then, the refrigerant is compressed to be
discharged to the discharge space 12 of the case 1 through the
discharge opening 44 of the fixed scroll 4. Such processes are
repeatedly performed.
[0024] The orbiting scroll 5 may form the compression chambers (P)
which move towards the center of the orbiting scroll 5 while
performing an orbiting motion while engaged with the fixed scroll
4. The compression chambers may have a relatively high pressure
towards the discharge side, i.e., the final compression chamber
side corresponding to the central part. As the compression chambers
have a high pressure, a gas repulsive force may be generated that
pushes the fixed scroll 4 and the orbiting scroll 5 in a radial
direction.
[0025] In this situation, this force may push on the fixed scroll
4, but the fixed scroll 4 does not move in a radial direction since
it is fixed to the main frame 3 by bolts. On the other hand, the
orbiting scroll 5 may be moved with respect to the fixed scroll 4
in a radial direction, since it is installed between the main frame
3 and the fixed scroll 4 so as to rotate together with the crank
shaft 23.
[0026] Gaps may be generated between the distal ends of the wraps
of the compression chambers and the respective plate portions. This
may increase leakage of refrigerant in an axial direction.
Accordingly, a tip seal may be installed at the distal end of the
wrap. Alternatively, a back pressure chamber may be formed on a
rear surface of the orbiting scroll 5 so that the orbiting scroll 5
may be substantially entirely supported in an axial direction by
pressure obtained as part of compression gas is bypassed. In the
latter case, a relatively large amount of high-pressure gas may be
required to adequately support the entire orbiting scroll 5.
Accordingly, a large amount of compression gas may be leaked to the
back pressure chamber from the compression chambers. However, this
may degrade compressor performance, or may lower the reliability of
the compressor since the orbiting scroll is not uniformly supported
by the pressure in the back pressure chamber.
[0027] Accordingly, a scroll compressor as embodied and broadly
described herein may include a separation-type orbiting scroll
having a back pressure chamber formed between two parts of the
orbiting scroll. When so configured, a gap between the fixed scroll
and the orbiting scroll may be substantially completely sealed by a
relatively low pressure.
[0028] For instance, the orbiting scroll 5 may include the wrap
portion 50 engaged with the fixed scroll 4, and a base portion 60
coupled to the wrap portion 50.
[0029] The wrap portion 50 may include the orbiting wrap 52 which
forms compression chambers by engagement with the fixed wrap 42,
and a wrap flange 54 integrally formed with the orbiting wrap 52.
The wrap flange 54 may have a disc shape.
[0030] The base portion 60 may be coupled to the wrap portion 50,
facing the bottom surface of the wrap flange 54. More specifically,
the base portion 60 may include a base flange 64 having a disc
shape in a similar manner to the wrap flange 54, and a boss portion
68 formed on the bottom surface of the base flange 64 and coupled
to the crank shaft 23.
[0031] A plurality of guide pins 66 slidably inserted into guide
holes 58 formed in the wrap portion 50 may be formed on the edge of
the upper surface of the base flange 64. As the guide pins 66 are
slidably inserted into the guide holes 58 in an axial direction,
the wrap portion 50 may be moved with respect to the base portion
60 in an axial direction of the crank shaft 23. However, in this
case, the wrap portion 50 cannot be moved in a radial direction or
a circumferential direction of the crank shaft 23. Since the
movement of the wrap portion 50 in an axial direction is restricted
by a gap between the fixed scroll 4 and the main frame 3, the guide
pins 66 may remain inserted into the guide holes 58. That is, the
wrap portion 50 and the base portion 60 may be stably coupled to
each other just as the guide pins 66 are inserted into the guide
holes 58, without using a bolt-coupling method or a welding
method.
[0032] Since the guide pins 66 and the guide holes 58 are easily
processed, fabrication costs may be reduced. Further, since the
guide pins 66 and the guide holes 58 are precisely processed,
unstable behavior of the orbiting scroll 5 may be prevented. Since
the guide pins 66 and the guide holes 58 are formed to have a
circular cross section, abrasion of the guide pins 66 or the guide
holes 58 may be prevented because a load applied to the guide pins
66 is uniformly distributed even if the base portion 60 transfers a
driving force of the driving motor 2 to the wrap portion 50.
[0033] The Oldham's ring 6, serving as a rotation preventing
device, may be coupled to the bottom surface of the base portion
60. More specifically, the Oldham's ring 6 may include a
ring-shaped portion 6a contacting the bottom surface of the base
flange 64. First protrusions 6b having a phase difference of
180.degree. from each other may be formed at two sides of the
bottom surface of the ring-shaped portion 6a. The first protrusions
6b may be inserted into first protrusion recesses 3a of the main
frame 3. Second protrusions 6c having a phase difference of
180.degree. from each other may be formed at two sides of the upper
surface of the ring-shaped portion 6a. The second protrusions 6c
may be inserted into second protrusion recesses 64a formed on the
bottom surface of the base flange 64, respectively.
[0034] When so configured, even if a rotational force of the crank
shaft 23 is transferred to the base portion 60, the base portion 60
performs an orbit motion without being rotated, and the wrap
portion 50 coupled to the base portion 60, which is prevented from
moving in a radial direction, also performs an orbit motion
together with the base portion 60.
[0035] A back pressure chamber 62 having a seal 62a may be formed
on the upper surface of the base flange 64. Referring to FIG. 4,
the back pressure chamber 62 may be formed between the bottom
surface of the wrap flange 54 and the upper surface of the base
flange 64. The inner space of the back pressure chamber 62 may be
separated from the suction space 11 (low pressure part) by the seal
62a inserted into and fixed to the base flange 64. A back pressure
hole 54a for communicating the inner space of the back pressure
chamber 62 with the compression chambers (P) may penetrate the base
flange 64.
[0036] Accordingly, refrigerant compressed in the compression
chambers may be partially introduced into the back pressure chamber
through the back pressure hole 54a. Since the inner pressure of the
back pressure chamber 62 is higher than the peripheral pressure of
the base flange 64, the wrap portion 50 is prevented from moving
upward from the base portion 60 in an axial direction. Further,
this may prevent bending of a central part of the wrap portion 50
towards the base portion 60 due to a pressure of the compression
chambers. When so figured, a gap between the bottom surface of the
fixed scroll 4 and the orbiting wrap 52 may be sealed.
[0037] The inner pressure of the back pressure chamber 62 may be
determined according to the position of the back pressure hole 54a.
That is, as the back pressure hole 54a moves close to the center of
the orbiting wrap 52 of the orbiting scroll 5, the pressure in the
back pressure chamber 62 increases. On the other hand, as the back
pressure hole 54a moves towards the outside of the orbiting wrap 52
of the orbiting scroll 5, the pressure in the back pressure chamber
62 decreases.
[0038] FIGS. 5 to 7 are planar views of the wraps 42 and 52,
illustrating a process in which a refrigerant is compressed by the
orbiting wrap 52 and the fixed wrap 42. Referring to FIG. 7, as a
pressure in a final compression chamber reaches a discharge
pressure, a discharge operation is initiated. As aforementioned,
the pressure in the compression chambers formed by the orbiting
wrap and the fixed wrap continuously changes during a compression
operation. Accordingly, a pressure at any point on the orbiting
wrap also continuously changes in a single compression cycle.
[0039] For instance, if the back pressure hole 54a is positioned at
`a`, the same pressure as a discharge pressure is applied to the
back pressure chamber 62, because the point `a` is a position where
a discharge pressure is maintained during a compression operation.
In this case, a strong thrust force (frictional force in an axial
direction) is generated between the bottom surface of the fixed
scroll and the orbiting wrap due to an excessive back pressure.
This may cause frictional loss to be increased. Further, a
discharge pressure is variable according to the amount of a
compression load applied to the compressor. Accordingly, if the
back pressure hole 54a is formed at the point `a` where a discharge
pressure is continuously applied, the frictional force in an axial
direction (thrust force) is variable according to a load. This may
influence the performance of the compressor. More specifically, the
point `a` is within the range of a discharge starting angle
(hereinafter, will be referred to as `.alpha.`).
[0040] Referring to FIG. 6, the point `b` is a position where a
discharge pressure is applied for a predetermined time duration
during a compression operation, and an intermediate pressure
between a suction pressure and a discharge pressure is applied for
the remaining time duration. Accordingly, if the back pressure hole
54a is formed at the point `b`, a proper back pressure may be
obtained, and a discharge pressure changed by the change of a load,
etc. may be attenuated by the intermediate pressure. The present
inventor has certified that the point `b` is within the range of
180.degree., from the discharge starting angle of the orbiting
wrap, i.e., `.alpha.+180`.
[0041] As shown in FIG. 7, the point `c` is a point where only an
intermediate pressure is continuously applied during a compression
operation. Accordingly, if a back pressure hole 54a is formed at
the point `c`, a back pressure is too low and there may be
difficulty in obtaining sufficient sealing. This may cause leakage
of refrigerant.
[0042] When compressing a refrigerant while performing an orbit
motion, a non-uniform moment may be applied to the orbiting scroll
5 due to a gas repulsive force. If the non-uniform moment is not
effectively reduced, the orbiting scroll 5 may experience unstable
behavior. This may increase frictional loss or abrasion between the
orbiting scroll 5 and the fixed scroll 4, or between the orbiting
scroll 5 and the main frame 3, or between the wrap portion 50 and
the base portion 60. This may lower the reliability and/or
performance of the compressor.
[0043] In embodiments as broadly described herein, the center of
the back pressure chamber 62 which supports the orbiting scroll 5
in an axial direction may be eccentrically positioned at a point
where a non-uniform moment is the greatest. This may prevent
unstable behavior of the orbiting scroll 5. Generally, a
non-uniform moment occurring on the orbiting scroll 5 while the
crank shaft 23 performs a single rotation may be greatest when
refrigerant is discharged. Therefore, in order to effectively
reduce the non-uniform moment, the center of the back pressure
chamber 62 may be positioned at a point where refrigerant starts to
be discharged.
[0044] Referring to FIGS. 8 and 9, it is assumed that a line which
connects a geometric center (B) of the orbiting scroll 5 with a
rotation center (axial center) (C) of the crank shaft 23 is a first
virtual line (L1), and a line perpendicular to the first virtual
line (L1) is a second virtual line (L2). Under such assumption, a
gas repulsive force is applied to the orbiting scroll 5 in a
direction of the second virtual line (L2), a direction resistive to
rotation.
[0045] The center (O) of the back pressure chamber 62 may be
eccentric from the geometric center (B) of the orbiting scroll 5 by
a predetermined gap, so as to be positioned within the range of
.+-.30.degree. from the second virtual line (L2) positioned on the
opposite side to a direction where a gas repulsive force is
applied, preferably, so as to be positioned on the second virtual
line (L2) where a gas repulsive force is applied.
[0046] In a scroll compressor as embodied and broadly described
herein, the wrap portion and the base portion are coupled to each
other by a plurality of pins and a plurality of guide holes. The
guide pins, and the guide holes for inserting the guide pins are
easily processed, thereby reducing the fabricating costs. Further,
since the guide pins and the guide holes are precisely processed,
unstable behavior of the orbiting scroll may be prevented. Further,
since the guide pins and the guide holes have a circular cross
section, abrasion of the guide pins or the guide holes may be
prevented.
[0047] A scroll compressor is provided including an easily
fabricated orbiting scroll.
[0048] A scroll compressor is provided that is capable of
minimizing frictional loss between an orbiting scroll and a fixed
scroll, and capable of obtaining a sufficient sealing performance
even if a load changes.
[0049] A scroll compressor as embodied and broadly described herein
may include a case; a fixed scroll installed in the case; a wrap
portion configured to form compression chambers by being engaged
with the fixed scroll; a base portion coupled to the wrap portion,
and configured to support the wrap portion so as to be movable
towards the fixed scroll; a driving motor coupled to a rear surface
of the base portion, and configured to eccentrically rotate the
base portion and the wrap portion; and a main frame installed in
the case, and configured to support the base portion in an axial
direction, wherein a plurality of guide pins are formed at one of
the wrap portion and the base portion in an axial direction, and
guide holes for slidably inserting the guide pins in an axial
direction are formed at another thereof.
[0050] A scroll compressor according to another embodiment as
broadly described herein may include comprising: a fixed scroll
having a fixed wrap; and an orbiting scroll having an orbiting wrap
and performing an orbit motion with respect to the fixed scroll, in
which a pair of compression chambers that consecutively move are
formed between the orbiting scroll and the fixed scroll, wherein
the orbiting scroll is divided into at least two parts in an axial
direction, and wherein a plurality of guide pins are formed at one
of the divided parts in an axial direction, and guide holes for
slidably inserting the guide pins in an axial direction are formed
at another of the divided parts.
[0051] Any reference in this specification to "one embodiment," "an
embodiment," "example embodiment," etc., means that a particular
feature, structure, or characteristic described in connection with
the embodiment is included in at least one embodiment of the
invention. The appearances of such phrases in various places in the
specification are not necessarily all referring to the same
embodiment. Further, when a particular feature, structure, or
characteristic is described in connection with any embodiment, it
is submitted that it is within the purview of one skilled in the
art to effect such feature, structure, or characteristic in
connection with other ones of the embodiments.
[0052] Although embodiments have been described with reference to a
number of illustrative embodiments thereof, it should be understood
that numerous other modifications and embodiments can be devised by
those skilled in the art that will fall within the spirit and scope
of the principles of this disclosure. More particularly, various
variations and modifications are possible in the component parts
and/or arrangements of the subject combination arrangement within
the scope of the disclosure, the drawings and the appended claims.
In addition to variations and modifications in the component parts
and/or arrangements, alternative uses will also be apparent to
those skilled in the art.
* * * * *