U.S. patent application number 16/573480 was filed with the patent office on 2020-03-19 for scroll type compressor.
The applicant listed for this patent is LG Electronics Inc.. Invention is credited to Yongkyu CHOI, Byeongchul LEE, Kyoungjun PARK, Byungkil YOO.
Application Number | 20200088195 16/573480 |
Document ID | / |
Family ID | 67988885 |
Filed Date | 2020-03-19 |
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United States Patent
Application |
20200088195 |
Kind Code |
A1 |
YOO; Byungkil ; et
al. |
March 19, 2020 |
SCROLL TYPE COMPRESSOR
Abstract
A scroll type compressor includes a motor including a rotor; a
rotatable shaft coupled to the rotor; a frame disposed adjacent to
the motor to support the rotatable shaft; a fixed scroll coupled to
the frame; an orbiting scroll eccentrically coupled to the
rotatable shaft, wherein the orbiting scroll is engaged with the
fixed scroll to orbit relative to the fixed scroll; and a balance
weight including: a coupling portion having an inner opening
defined therein receiving the rotatable shaft, wherein the coupling
portion is coupled to and between the rotor and the frame; and a
weight portion extending from an outer periphery of the coupling
portion.
Inventors: |
YOO; Byungkil; (Seoul,
KR) ; PARK; Kyoungjun; (Seoul, KR) ; LEE;
Byeongchul; (Seoul, KR) ; CHOI; Yongkyu;
(Seoul, KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LG Electronics Inc. |
Seoul |
|
KR |
|
|
Family ID: |
67988885 |
Appl. No.: |
16/573480 |
Filed: |
September 17, 2019 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04C 23/008 20130101;
F04C 2240/807 20130101; F04C 29/0021 20130101; F04C 23/02 20130101;
F04C 18/0215 20130101; F25B 31/026 20130101 |
International
Class: |
F04C 29/00 20060101
F04C029/00; F04C 23/02 20060101 F04C023/02 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 17, 2018 |
KR |
10-2018-0110884 |
Claims
1. A scroll type compressor comprising: a casing that defines an
inner space therein; a motor disposed in the inner space of the
casing and configured to generate a rotating force, the motor
comprising a stator and a rotor; a rotatable shaft coupled to the
rotor of the motor; a frame disposed at a side of the motor and
configured to support the rotatable shaft; a fixed scroll coupled
to the frame, the fixed scroll and the frame defining a compressing
chamber therebetween; an orbiting scroll that is eccentrically
coupled to the rotatable shaft, that is located in the compressing
chamber, and that is engaged with the fixed scroll, the orbiting
scroll being configured to orbit relative to the fixed scroll; and
a balance weight comprising: a coupling portion that defines an
inner opening therein receiving the rotatable shaft, the coupling
portion being coupled to the rotatable shaft at a position between
the rotor and the frame, and a weight portion that extends from an
outer periphery of the coupling portion.
2. The scroll type compressor of claim 1, wherein the rotatable
shaft comprises a stopping shoulder that protrudes from an outer
circumferential surface of the rotatable shaft, and wherein the
balance weight is coupled to a position between the rotor and the
stopping shoulder.
3. The scroll type compressor of claim 1, wherein the weight
portion has a uniform thickness.
4. The scroll type compressor of claim 1, wherein the weight
portion comprises at least one bent portion.
5. The scroll type compressor of claim 4, wherein a shape of the at
least one bent portion corresponds to an outer shape of the
frame.
6. The scroll type compressor of claim 1, wherein the coupling
portion is configured to couple to the rotatable shaft based on
sliding along the rotatable shaft to decrease a clearance defined
between the coupling portion and the rotatable shaft.
7. The scroll type compressor of claim 6, wherein the coupling
portion is configured to be fixed to the rotatable shaft based on
the rotor being press-fitted with the rotatable shaft.
8. The scroll type compressor of claim 1, further comprising an
anti-rotation mechanism configured to restrict rotation of the
balance weight relative to the rotatable shaft.
9. The scroll type compressor of claim 8, wherein the anti-rotation
mechanism comprises: a groove defined in the rotor; and a
protrusion that protrudes from the coupling portion and that is
configured to be inserted into the groove.
10. The scroll type compressor of claim 8, wherein the
anti-rotation mechanism comprises: a pin installed on the rotor;
and a pin hole defined in the coupling portion and configured to
receive the pin.
11. The scroll type compressor of claim 8, wherein the motor
comprises a plurality of plates, and wherein the anti-rotation
mechanism comprises: a rivet that fixes the plurality of plates to
one another, and a rivet hole defined at the balance weight and
configured to receive a head of the rivet.
12. The scroll type compressor of claim 2, wherein the coupling
portion comprises an extended coupling part that extends along the
rotatable shaft, and wherein a width of the extended coupling part
corresponds to a spacing between the stopping shoulder and the
rotor.
13. A scroll type compressor comprising: a casing that defines an
inner space therein; a motor disposed in the inner space of the
casing and configured to generate a rotating force, the motor
comprising a stator and a rotor; a rotatable shaft coupled to the
rotor of the motor, the rotatable shaft comprising a stopping
shoulder that protrudes from an outer circumferential surface of
the rotatable shaft; a frame disposed adjacent to the motor and
configured to support the rotatable shaft; a fixed scroll coupled
to the frame, the fixed scroll and the frame defining a compressing
chamber therebetween; an orbiting scroll that is eccentrically
coupled to the rotatable shaft, that is located in the compressing
chamber, and that is engaged with the fixed scroll, the orbiting
scroll being configured to orbit relative to the fixed scroll; and
a balance weight that is coupled to the rotatable shaft at a
position between the rotor and the stopping shoulder and that is
configured to counterbalance a centrifugal force generated by
rotation of the orbiting scroll.
14. The scroll type compressor of claim 13, wherein the balance
weight comprises: a coupling portion that defines an inner opening
therein receiving the rotatable shaft and that is coupled to the
rotatable shaft at the position between the rotor and the stopping
shoulder; and a weight portion that extends from a portion of an
outer circumference of the coupling portion.
15. The scroll type compressor of claim 14, wherein the coupling
portion is configured to couple to the rotatable shaft based on
sliding along the rotatable shaft to decrease a clearance defined
between the coupling portion and the rotatable shaft.
16. The scroll type compressor of claim 15, wherein the coupling
portion is configured to be fixed to the rotatable shaft based on
the rotor being press-fitted with the rotatable shaft.
17. The scroll type compressor of claim 14, further comprising an
anti-rotation mechanism configured to restrict rotation of the
balance weight relative to the rotatable shaft.
18. The scroll type compressor of claim 17, wherein the
anti-rotation mechanism comprises: a groove defined in the rotor;
and a protrusion that protrudes from the coupling portion and that
is configured to be inserted into the groove.
19. The scroll type compressor of claim 17, wherein the
anti-rotation mechanism comprises: a pin installed on the rotor;
and a pin hole defined in the coupling portion and configured to
receive the pin.
20. The scroll type compressor of claim 17, wherein the motor
comprises a plurality of plates, and wherein the anti-rotation
mechanism comprises: a rivet that fixes the plurality of plates to
one another, and a rivet hole defined at the balance weight and
configured to receive a head of the rivet.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority under 35 U.S.C. .sctn. 371
to Korean Patent Application No. 10-2018-0110884, filed on Sep. 17,
2018. The disclosure of the prior application is incorporated by
reference in its entirety.
BACKGROUND
1. Field
[0002] The present disclosure relates to a compressor and, in
particular, to a scroll type compressor including a balance
weight.
2. Description of Related Art
[0003] A scroll type compressor is one type of compressors that has
a fixed scroll fixed in an inner space of a closed casing and an
orbiting scroll rotatably engaged with the fixed scroll to compress
fluid such as refrigerant.
[0004] Such a scroll type compressor may obtain a relatively high
compression ratio compared to other types of compressors. In
addition, suction, compression and discharge processes of the fluid
are smoothly connected to each other to obtain a stable torque.
Thus, the scroll type compressor is widely used for refrigerant
compression in an air conditioner.
[0005] The scroll type compressor may be equipped with a balance
weight to compensate for an unbalance caused by a centrifugal force
of an eccentric orbiting scroll.
[0006] Normally, the balance weight is press-inserted into a
rotatable shaft or is coupled to a rotor of a motor via a
rivet.
[0007] The balance weight is usually produced to a large thickness
using forging or casting.
[0008] Thus, in order for the thick balance weight to be
press-inserted into the rotatable shaft, it is necessary to
maintain a thickness of a press-inserted part thereof. To this end,
a thick steel plate is used for the press-inserted part, or the
press-inserted part is folded one time to secure a thickness
thereof. Further, precision machining may be added to adapt a
dimension of the press-inserted part.
[0009] Thus, there is a need for a method that can efficiently
manufacture and assemble the balance weight while reducing such
additional processes.
SUMMARY
[0010] The present disclosure aims to solve the above problem. One
purpose of the present disclosure is to provide a scroll type
compressor in which a balance weight may be fabricated and
assembled in a small number of processes.
[0011] Further, another purpose of the present disclosure is to
provide a scroll type compressor in which a balance weight may be
fabricated and assembled using a relatively thin plate.
[0012] Further, another purpose of the present disclosure is to
provide a scroll type compressor in which a balance weight is not
press-fitted into the compressor but is coupled thereto in a
sliding manner.
[0013] Further, another purpose of the present disclosure is to
provide a scroll type compressor in which an additional machining
or precision machining to secure a press-fitted face.
[0014] Purposes of the present disclosure are not limited to the
above-mentioned purpose. Other purposes and advantages of the
present disclosure as not mentioned above may be understood from
following descriptions and more clearly understood from embodiments
of the present disclosure. Further, it will be readily appreciated
that the purposes and advantages of the present disclosure may be
realized by features and combinations thereof as disclosed in the
claims.
[0015] In order to achieve the technical purposes, an embodiment of
the present disclosure proposes a scheme in which a plate type
balance weight is fixed to the compressor via a motor rotor that is
pressed into a motor rotatable shaft. Therefore, this does not take
into account the thickness of a press-fitted part of the plate type
balance weight and thus a precision machining of the press-fitted
part is not required.
[0016] That is, one embodiment of the present disclosure proposes a
scheme in which a balance weight shape is formed using a sheet
metal plate, and the motor rotor is pressed into the motor
rotatable shaft while the balance weight is fitted into the motor
rotatable shaft together with the motor rotor.
[0017] One embodiment of the present disclosure may propose a
balance weight including a coupling portion having an opening
defined therein receiving the motor rotatable shaft and coupled to
between the motor rotor and the compressor frame, and a weight
portion extending along an outer periphery of the coupling
portion.
[0018] One embodiment of the present disclosure may propose a
balance weight that is coupled to between the motor rotor and a
stopping shoulder formed on the rotatable shaft to offset a
centrifugal force generated by rotation of the orbiting scroll.
[0019] In a first aspect, the present disclosure provides a scroll
type compressor comprising: a casing having a closed inner space
defined therein; a motor installed in the inner space of the casing
to generate a rotating force, wherein the motor includes a stator
and a rotor; a rotatable shaft coupled to the rotor of the motor; a
frame disposed adjacent to the motor to support the rotatable
shaft; a fixed scroll coupled to the frame to define a compressing
chamber therebetween; an orbiting scroll eccentrically coupled to
the rotatable shaft, wherein the orbiting scroll is located in the
compressing chamber, and is engaged with the fixed scroll to orbit
relative to the fixed scroll; and a balance weight including: a
coupling portion having an inner opening defined therein receiving
the rotatable shaft, wherein the coupling portion is coupled to and
between the rotor and the frame; and a weight portion extending
from an outer periphery of the coupling portion.
[0020] In one implementation of the first aspect, the balance
weight is coupled to and between the rotor and a stopping shoulder
formed on the rotatable shaft.
[0021] In one implementation of the first aspect, the weight
portion has a uniform thickness.
[0022] In one implementation of the first aspect, the weight
portion is bent at least once.
[0023] In one implementation of the first aspect, the weight
portion is bent into a corresponding shape to an outer shape of the
frame.
[0024] In one implementation of the first aspect, the coupling
portion is coupled to the rotatable shaft while sliding along a
clearance.
[0025] In one implementation of the first aspect, the coupling
portion is fixed coupled to the rotatable shaft while the rotor is
press-fitted with the rotatable shaft.
[0026] In one implementation of the first aspect, the balance
weight includes an anti-rotation mechanism to prevent independent
rotation of the balance weight.
[0027] In one implementation of the first aspect, the anti-rotation
mechanism includes: a groove formed in the rotor; and a protrusion
formed on the coupling portion and inserted into the groove.
[0028] In one implementation of the first aspect, the anti-rotation
mechanism includes: a pin installed on the motor rotor; and a pin
hole defined in the coupling portion and receiving the pin.
[0029] In one implementation of the first aspect, the anti-rotation
mechanism includes: a rivet for fixing plates of the motor to each
other; and a rivet hole receiving a head of the rivet.
[0030] In one implementation of the first aspect, the coupling
portion has an extended coupling part extending therefrom, wherein
the extended coupling part has a width corresponding to a spacing
between the stopping shoulder and the motor rotor.
[0031] In a second aspect, the present disclosure provides a scroll
type compressor comprising: a casing having a closed inner space
defined therein; a motor installed in the inner space of the casing
to generate a rotating force, wherein the motor includes a stator
and a rotor; a rotatable shaft coupled to the rotor of the motor; a
frame disposed adjacent to the motor to support the rotatable
shaft; a fixed scroll coupled to the frame to define a compressing
chamber therebetween; an orbiting scroll eccentrically coupled to
the rotatable shaft, wherein the orbiting scroll is located in the
compressing chamber, and is engaged with the fixed scroll to orbit
relative to the fixed scroll; and a balance weight coupled to and
between the motor rotor and a stopping shoulder formed on the
rotatable shaft, wherein the balance weight is configured to
counterbalance a centrifugal force generated by rotation of the
orbiting scroll.
[0032] In one implementation of the second aspect, the balance
weight includes: a coupling portion having an inner opening defined
therein receiving the rotatable shaft and coupled to and between
the motor rotor and the stopping shoulder; and a weight portion
extending from a portion of an outer circumference of the coupling
portion.
[0033] In one implementation of the second aspect, the coupling
portion is coupled to the rotatable shaft while sliding along a
clearance.
[0034] In one implementation of the second aspect, the coupling
portion is fixed coupled to the rotatable shaft while the rotor is
press-fitted with the rotatable shaft.
[0035] In one implementation of the second aspect, the balance
weight includes an anti-rotation mechanism to prevent independent
rotation of the balance weight.
[0036] In one implementation of the second aspect, the
anti-rotation mechanism includes: a groove formed in the rotor; and
a protrusion formed on the coupling portion and inserted into the
groove.
[0037] In one implementation of the second aspect, the
anti-rotation mechanism includes: a pin installed on the motor
rotor; and a pin hole defined in the coupling portion and receiving
the pin.
[0038] In one implementation of the second aspect, the
anti-rotation mechanism includes: a rivet for fixing plates of the
motor to each other; and a rivet hole receiving a head of the
rivet.
BRIEF DESCRIPTION OF DRAWINGS
[0039] FIG. 1 is a cross-sectional view of a scroll compressor
according to a first embodiment of the present disclosure.
[0040] FIG. 2 is a perspective view showing a balance weight
according to a first embodiment of the present disclosure.
[0041] FIG. 3 is a cross-sectional view of a scroll compressor
according to a second embodiment of the present disclosure.
[0042] FIG. 4 is a perspective view showing a balance weight
according to a second embodiment of the present disclosure.
[0043] FIG. 5 is a schematic diagram showing a process of
installing a balance weight according to a second embodiment of the
present disclosure.
[0044] FIG. 6 is a schematic diagram showing a state in which a
balance weight has been installed according to a second embodiment
of the present disclosure.
[0045] FIG. 7 is a schematic diagram showing a process of
installing a balance weight according to a third embodiment of the
present disclosure.
[0046] FIG. 8 is a perspective view showing a balance weight
according to a third embodiment of the present disclosure.
[0047] FIG. 9 is a schematic diagram showing a process of
installing a balance weight according to a fourth embodiment of the
present disclosure.
[0048] FIG. 10 is a perspective view showing a balance weight
according to a fourth embodiment of the present disclosure.
[0049] FIG. 11 is a plan view showing a structure of a coupling
portion and a pin hole of the balance weight according to the
fourth embodiment of the present disclosure.
[0050] FIG. 12 is a schematic diagram showing a process of
installing a balance weight according to a fifth embodiment of the
present disclosure.
[0051] FIG. 13 is a schematic diagram showing a process of
installing a balance weight according to a sixth embodiment of the
present disclosure.
DETAILED DESCRIPTIONS
[0052] For simplicity and clarity of illustration, elements in the
figures are not necessarily drawn to scale. The same reference
numbers in different figures denote the same or similar elements,
and as such perform similar functionality. Furthermore, in the
following detailed description of the present disclosure, numerous
specific details are set forth in order to provide a thorough
understanding of the present disclosure. However, it will be
understood that the present disclosure may be practiced without
these specific details. In other instances, well-known methods,
procedures, components, and circuits have not been described in
detail so as not to unnecessarily obscure aspects of the present
disclosure.
[0053] Examples of various embodiments are illustrated and
described further below. It will be understood that the description
herein is not intended to limit the claims to the specific
embodiments described. On the contrary, it is intended to cover
alternatives, modifications, and equivalents as may be included
within the spirit and scope of the present disclosure as defined by
the appended claims.
[0054] The terminology used herein is for the purpose of describing
particular embodiments only and is not intended to be limiting of
the present disclosure. As used herein, the singular forms "a" and
"an" are intended to include the plural forms as well, unless the
context clearly indicates otherwise. It will be further understood
that the terms "comprises", "comprising", "includes", and
"including" when used in this specification, specify the presence
of the stated features, integers, operations, elements, and/or
components, but do not preclude the presence or addition of one or
more other features, integers, operations, elements, components,
and/or portions thereof. As used herein, the term "and/or" includes
any and all combinations of one or more of the associated listed
items. Expression such as "at least one of" when preceding a list
of elements may modify the entire list of elements and may not
modify the individual elements of the list.
[0055] It will be understood that, although the terms "first",
"second", "third", and so on may be used herein to describe various
elements, components, regions, layers and/or sections, these
elements, components, regions, layers and/or sections should not be
limited by these terms. These terms are used to distinguish one
element, component, region, layer or section from another element,
component, region, layer or section. Thus, a first element,
component, region, layer or section described below could be termed
a second element, component, region, layer or section, without
departing from the spirit and scope of the present disclosure.
[0056] In addition, it will also be understood that when a first
element or layer is referred to as being present "on" or "beneath"
a second element or layer, the first element may be disposed
directly on or beneath the second element or may be disposed
indirectly on or beneath the second element with a third element or
layer being disposed between the first and second elements or
layers. It will be understood that when an element or layer is
referred to as being "connected to", or "coupled to" another
element or layer, it can be directly on, connected to, or coupled
to the other element or layer, or one or more intervening elements
or layers may be present. In addition, it will also be understood
that when an element or layer is referred to as being "between" two
elements or layers, it can be the only element or layer between the
two elements or layers, or one or more intervening elements or
layers may be present.
[0057] Further, as used herein, when a layer, film, region, plate,
or the like is disposed "on" or "on a top" of another layer, film,
region, plate, or the like, the former may directly contact the
latter or still another layer, film, region, plate, or the like may
be disposed between the former and the latter. As used herein, when
a layer, film, region, plate, or the like is directly disposed "on"
or "on a top" of another layer, film, region, plate, or the like,
the former directly contacts the latter and still another layer,
film, region, plate, or the like is not disposed between the former
and the latter. Further, as used herein, when a layer, film,
region, plate, or the like is disposed "below" or "under" another
layer, film, region, plate, or the like, the former may directly
contact the latter or still another layer, film, region, plate, or
the like may be disposed between the former and the latter. As used
herein, when a layer, film, region, plate, or the like is directly
disposed "below" or "under" another layer, film, region, plate, or
the like, the former directly contacts the latter and still another
layer, film, region, plate, or the like is not disposed between the
former and the latter.
[0058] Unless otherwise defined, all terms including technical and
scientific terms used herein have the same meaning as commonly
understood by one of ordinary skill in the art to which this
inventive concept belongs. It will be further understood that
terms, such as those defined in commonly used dictionaries, should
be interpreted as having a meaning that is consistent with their
meaning in the context of the relevant art and will not be
interpreted in an idealized or overly formal sense unless expressly
so defined herein.
[0059] FIG. 1 is a cross-sectional view of a scroll compressor
according to a first embodiment of the present disclosure. FIG. 1
shows a horizontal scroll compressor.
[0060] This horizontal scroll compressor may include a casing 100
having an enclosed interior space defined therein. Components for
compressing fluid may be installed in the casing 100. That is, the
components in the casing 100 may include a motor 200, a rotatable
shaft 300, a fixed scroll 500 and an orbiting scroll 600 engaged
with each other, and a frame 400 on which the rotatable shaft 300
is installed.
[0061] The casing 100 having the closed space may be embodied in a
form of a horizontal cylinder. The casing 100 may have an intake
port 111 and a discharge port 112 for input and output of
refrigerant thereto and therefrom.
[0062] The inner space of the casing 100 may receive the motor 200
that generates rotational force. Further, the rotatable shaft 300
may be installed which is coupled with a rotor 210 of the motor
200.
[0063] This rotatable shaft 300 may be eccentrically coupled to the
orbiting scroll 600. That is, the motor 200 may provide a
rotational force via the rotatable shaft 30 to the orbiting scroll
600 to rotate.
[0064] The frame 400 may be installed adjacent to the motor 200.
The frame 400 may be formed as a main frame and may be made of a
high hardness material such as cast iron.
[0065] This frame 400 may provide a support structure on which the
fixed scroll 500 and orbiting scroll 600 may be installed. That is,
the fixed scroll 500 may be coupled to the frame 400 to define a
compressing chamber 501.
[0066] In this connection, the casing 100 may have a discharging
chamber 101 defined therein through which refrigerant gas is
discharged from the compressing chamber 501. The discharge port 112
may communicate with the discharging chamber 101 so that the
refrigerant in the discharging chamber 101 may be discharged
through the discharge port 112.
[0067] In this discharging chamber 101, oil may be separated from
the refrigerant. In this connection, the oil collected into a lower
space may be suctioned by an oil pick-up 113 and then be supplied
to each of rotating parts.
[0068] A separate inverter chamber 140 may be defined adjacent to
the intake port 111 in the casing 100. An inverter 120 may be
located in the inverter chamber 140. In one example, a power
connector 150 may be disposed inwardly of the inverter chamber 140
and may connect to the motor 200.
[0069] Further, a sealing structure 310 for sealing the compressing
chamber while rotatably fixing the rotatable shaft 300 may be
disposed on the frame 400. In one example, bearings (not shown) may
be installed on an inner end of the casing 100 to help the
rotatable shaft 300 to rotate smoothly.
[0070] The orbiting scroll 600 may be installed between the fixed
scroll 500 and the frame 400 such that the orbiting scroll 600 is
engaged with the fixed scroll 500 to perform an orbiting motion
with respect to the fixed scroll 500.
[0071] This orbiting scroll 600 is connected to the rotatable shaft
300. The scroll 600 may be eccentrically coupled to the rotatable
shaft 300 to perform the orbiting movement.
[0072] In this connection, a circular elastic plate (not shown) may
be interposed between the fixed scroll 500 and frame 400.
[0073] As described above, in the scroll type compressor 100, the
compressing chamber 501 may be defined between the orbiting scroll
600 and the fixed scroll 500, such that a back-pressure chamber 401
may be defined between the orbiting scroll 600 and the frame
400.
[0074] Within this back-pressure chamber 401, a balance weight 700
may be disposed for counterbalancing a centrifugal force generated
by the rotation of the orbiting scroll 600. This balance weight 700
may be installed on the rotatable shaft 300 and may be installed at
a position in an opposite direction to the eccentric direction of
the rotatable shaft 300.
[0075] That is, the balance weight 700 may be press-fitted with the
rotatable shaft 300 inside the frame 400. Thus, because the balance
weight 700 is press-fitted with the rotatable shaft 300, a
relatively thick steel sheet may be used for the weight to ensure a
thickness of the press-fitted face. Further, since the balance
weight 700 is installed inside the back-pressure chamber 401, this
thick steel plate may be bent once again.
[0076] FIG. 2 is a perspective view showing a balance weight
according to a first embodiment of the present disclosure.
[0077] As described above, the balance weight 700 according to the
first embodiment may be formed using a relatively thick iron plate
to secure the thickness of the press-fitted face.
[0078] That is, the balance weight 700 may include an annular
portion 703 having an opening 701 defined therein and having a
predetermined thickness for being press-fitted with the rotatable
shaft 300, and a weight portion 702 extending from the annular
portion 703 to a predetermined dimension.
[0079] Further, the weight portion 702 may be formed by bending the
thick iron sheet once. This bending may be configured to ensure the
thick portion such that the balance weight 700 is press-fitted with
the rotatable shaft and thus combined therewith. Further, this
bending may be configured because a shape of the balance weight 700
may be limited by the back-pressure chamber 401 since the weight is
installed inside the back-pressure chamber 401.
[0080] Referring back to FIG. 1, the weight portion 702 may have a
structure bent in this manner and have a constant width A.
Therefore, this may ensure a sufficient mass to counterbalance the
centrifugal force generated by the rotation of the orbiting scroll
600.
[0081] However, in order to secure the width A of the balance
weight 700 having such a structure, the frame 400 may be formed to
receive a portion of the width A. Thus, a total width of the casing
100 may increase by the width A.
[0082] FIG. 3 is a cross-sectional view of a scroll compressor
according to a second embodiment of the present disclosure.
[0083] Referring to FIG. 3, the scroll compressor according to the
second embodiment includes a casing 100 having an enclosed interior
space defined therein. Components for compressing fluid may be
installed in the casing 100. That is, the components in the casing
100 may include a motor 200, a rotatable shaft 300, a fixed scroll
500 and an orbiting scroll 600 engaged with each other, and a frame
400 on which the rotatable shaft 300 is installed. Further, the
components in the casing 100 may further include a balance weight
710 coupled to the rotatable shaft 300 and disposed between the
motor 200 and the frame 410.
[0084] When describing the structure of the scroll compressor
according to the second embodiment, substantially the same parts as
those in the first embodiment will be described with reference to
the same reference numerals.
[0085] As in the first embodiment, the casing 100 having the closed
space may be embodied in a form of a horizontal cylinder. The
casing 100 may have an intake port 111 and a discharge port 112 for
input and output of refrigerant thereto and therefrom.
[0086] The inner space of the casing 100 may receive the motor 200
that generates rotational force. Further, the rotatable shaft 300
may be installed which is coupled with a rotor 210 of the motor
200.
[0087] This rotatable shaft 300 may be eccentrically coupled to the
orbiting scroll 600. That is, the motor 200 may provide a
rotational force via the rotatable shaft 30 to the orbiting scroll
600 to rotate.
[0088] The frame 400 may be installed adjacent to the motor 200.
The frame 400 may be formed as a main frame and may be made of a
high hardness material such as cast iron.
[0089] This frame 400 may provide a support structure on which the
fixed scroll 500 and orbiting scroll 600 may be installed. That is,
the fixed scroll 500 may be coupled to the frame 400 to define a
compressing chamber 501.
[0090] In this connection, the casing 100 may have a discharging
chamber 101 defined therein through which refrigerant gas is
discharged from the compressing chamber 501. The discharge port 112
may communicate with the discharging chamber 101 so that the
refrigerant in the discharging chamber 101 may be discharged
through the discharge port 112.
[0091] In this discharging chamber 101, oil may be separated from
the refrigerant. In this connection, the oil collected into a lower
space may be suctioned by an oil pick-up 113 and then be supplied
to each of rotating parts.
[0092] A separate inverter chamber 140 may be defined adjacent to
the intake port 111 in the casing 100. An inverter 120 may be
located in the inverter chamber 140. In one example, a power
connector 150 may be disposed inwardly of the inverter chamber 140
and may connect to the motor 200.
[0093] Further, a sealing structure 310 for sealing the compressing
chamber while rotatably fixing the rotatable shaft 300 may be
disposed on the frame 400. In one example, bearings (not shown) may
be installed on an inner end of the casing 100 to help the
rotatable shaft 300 to rotate smoothly.
[0094] The orbiting scroll 600 may be installed between the fixed
scroll 500 and the frame 400 such that the orbiting scroll 600 is
engaged with the fixed scroll 500 to perform an orbiting motion
with respect to the fixed scroll 500.
[0095] This orbiting scroll 600 is connected to the rotatable shaft
300. The scroll 600 may be eccentrically coupled to the rotatable
shaft 300 to perform the orbiting movement.
[0096] In this connection, a circular elastic plate (not shown) may
be interposed between the fixed scroll 500 and frame 400.
[0097] As described above, in the scroll type compressor 100, the
compressing chamber 501 may be defined between the orbiting scroll
600 and the fixed scroll 500, such that a back-pressure chamber 401
may be defined between the orbiting scroll 600 and the frame
400.
[0098] As mentioned above, the balance weight 710 may be installed
on the rotatable shaft 300 and between the motor 200 and the frame
410.
[0099] Specifically, referring to an enlarged view of a region B in
FIG. 3, the balance weight 710 may be installed between one portion
of the frame 410 and the rotor 210 of the motor 200.
[0100] The balance weight 710 may be installed between a stopping
shoulder 301 formed on the rotatable shaft 300 (see FIG. 5) and the
rotor 210 of the motor 200. Further, since the rotor 210 of the
motor 200 is press-fitted with the rotatable shaft 300 and fixed
thereto, the balance weight 710 may not have a large thickness for
the press-fitting with the shaft 300, which may be different from
the configuration of the first embodiment.
[0101] That is, the balance weight 710 may be formed using a metal
sheet with a relatively smaller thickness in a form of a sheet
metal having a small thickness C. As such, the balance weight 710
is assembled with the rotatable shaft 300 while sliding along a
clearance. The rotor 210 of the motor 200 may be press-fitted with
the rotatable shaft 300 and fixed to the rotatable shaft 300.
[0102] This balance weight 710 may be installed on the rotatable
shaft 300, and may be installed at a position in an opposite
direction to the eccentric direction of the rotatable shaft 300.
The balance weight 710 may counterbalance the centrifugal force
generated by the rotation of the orbiting scroll 600.
[0103] As such, the balance weight 710 according to the second
embodiment, unlike the balance weight 700 of the first embodiment
may be assembled with the rotatable shaft 300 while sliding along a
clearance. Thus, the weight may have a relatively smaller thickness
C rather than having a relatively thick structure to ensure the
thickness of the press-fitted face as in the first embodiment.
[0104] This balance weight 710 will be described later in
detail.
[0105] FIG. 4 is a perspective view showing the balance weight
according to the second embodiment of the present disclosure.
[0106] Referring to FIG. 4, the balance weight 710 according to the
second embodiment may include a coupling portion 713 having an
inner opening 711 defined therein receiving the rotatable shaft 300
and coupled to between the motor rotor 210 and the frame 410, and a
weight portion 712 extending from an outer periphery of the
coupling portion 713.
[0107] This balance weight 710 may not be press-fitted with the
rotatable shaft 300 and rather may be coupled to the rotatable
shaft 300 while sliding along a clearance. Thus, the balance weight
710 may not have a large thickness for being press-fitted with the
shaft. Further, the balance weight 710 may not be installed in the
back-pressure chamber 411 inside the frame 410 and rather may be
installed outside the back-pressure chamber 411.
[0108] Thus, the balance weight 710 may not be limited to a
specific shape as long as the weight has a weight that may offset
the centrifugal force generated by the rotation of the orbiting
scroll 600.
[0109] In this connection, the balance weight 710 may be formed by
curving or bending a metal sheet having a small thickness C in an
adapted manner to an installation space in the compressor
space.
[0110] Referring back to FIG. 3, for example, the balance weight
710 may be bent to have a shape corresponding to an outer face
shape of the frame 410.
[0111] That is, the frame 410 has a bent structure toward the motor
to define the back-pressure chamber 411 and receive the sealing
structure 310. Thus, the balance weight 710 may be bent in a shape
corresponding to the bent structure of the frame 410.
[0112] Accordingly, the weight portion 712 of the balance weight
710 may have a uniform thickness C.
[0113] Further, the weight portion 712 of the balance weight 710
may include a bent face having at least one step. In this
connection, as described above, this bent face may be formed
corresponding to the outer face shape of the frame 410.
[0114] FIG. 5 is a schematic diagram showing a process of
installing the balance weight according to the second embodiment of
the present disclosure. Further, FIG. 6 is a schematic diagram
showing a state in which the balance weight has been installed
according to the second embodiment of the present disclosure.
[0115] Referring to FIG. 5, a stopping shoulder 301 may be formed
on the rotatable shaft 300. In other words, the rotatable shaft 300
has a portion in which a diameter of the rotatable shaft 300
rapidly increases at an opposite position to the motor rotor
210.
[0116] In this connection, the balance weight 710 may be coupled to
the rotatable shaft 300 while sliding along a clearance D. In this
connection, the sliding clearance D relates to a size of the
opening 711 of the balance weight 710. When the balance weight 710
is coupled to the rotatable shaft 300 while the opening 711
receives the shaft, the clearance D may refer to a spacing between
the weight and the shaft 300 such that no large external force is
required for sliding of the weight 710. Further, the clearance may
refer to a spacing between the weight and the shaft 300 such that
separate fastening means is required to allow the weight to firmly
fixed to the rotatable shaft 300 after sliding.
[0117] As such, the balance weight 710 may be slidably coupled to
the rotatable shaft 300 while the weight slides from an opposite
side to the stopping shoulder 301 thereto.
[0118] The rotor 210 of the motor 200 may then be coupled to the
rotatable shaft 300 in the same direction in which the balance
weight 710 slides. That is, the rotor 210 of the motor 200 may be
press-fitted with the rotatable shaft 300 from an opposite side to
the stopping shoulder 301 thereto.
[0119] Thus, the rotor 210 may be press-fitted with the rotatable
shaft 300 until the rotor 210 of the motor 200 is in contact with
and is fixed to the balance weight 710, precisely, until, as shown
in FIG. 6, the rotor 210 of the motor 200 is in contact with and
exerts a force acting on the balance weight 710.
[0120] In this connection, the coupling portion 713 of the balance
weight 710 may be firmly fixed to between the stopping shoulder 301
of the rotatable shaft 300 and the rotor 210 of the motor 200. That
is, the balance weight 710 may rotate at the same rotational speed
as the rotation speed of the shaft 300 together with the rotatable
shaft 300.
[0121] FIG. 7 is a schematic diagram showing a process of
installing a balance weight according to a third embodiment of the
present disclosure. Further, FIG. 8 is a perspective view showing a
balance weight according to a third embodiment of the present
disclosure.
[0122] Referring to FIG. 7, the balance weight 720 may be coupled
to the rotatable shaft 300 while sliding along a clearance D.
[0123] In this connection, the balance weight 720 may be slidably
coupled to the rotatable shaft 300 while the weight slides from an
opposite side to the stopping shoulder 301 thereto.
[0124] The rotor 210 of the motor 200 may then be coupled to the
rotatable shaft 300 in the same direction in which the balance
weight 720 slides. That is, the rotor 210 of the motor 200 may be
press-fitted with the rotatable shaft 300 from an opposite side to
the stopping shoulder 301 thereto.
[0125] Thus, the rotor 210 may be press-fitted with the rotatable
shaft 300 until the rotor 210 of the motor 200 is in contact with
and is fixed to the balance weight 720.
[0126] In this way, the coupling portion 723 of the balance weight
720 may be firmly fixed to and between the stopping shoulder 301 of
the rotatable shaft 300 and the rotor 210 of the motor 200.
[0127] In this connection, the balance weight 720 may include an
anti-rotation mechanism 724 and 302 to prevent the balance weight
720 from rotating independently of the rotatable shaft 300 and
rotor 210. That is, the anti-rotation mechanism 724 and 302 may be
configured to disallow the balance weight 720 to rotate
independently of the rotatable shaft 300 and rotor 210 and to allow
the balance weight 720 to rotate integrally with the rotor 210 of
the rotatable shaft 300 and the motor 200.
[0128] In the present embodiment, the anti-rotation mechanism may
include a groove 302 formed in the rotor 210 of the motor 200 and a
protrusion 724 protruding from the coupling portion 723 of the
balance weight 720 and inserted into the groove 302.
[0129] Referring to FIG. 8, a shape of the protrusion 724 formed on
the balance weight 720 is shown.
[0130] The balance weight 720 may include a coupling portion 723
having an inner opening 721 defined therein receiving the rotatable
shaft 300 and coupled to and between the motor rotor 210 and the
frame 410, and a weight portion 722 extending from an outer
periphery of the coupling portion 723.
[0131] Descriptions of remaining components may be the same at
those of at least one of the first to third embodiments as
described above.
[0132] FIG. 9 is a schematic diagram showing a process of
installing a balance weight according to a fourth embodiment of the
present disclosure. Further, FIG. 10 is a perspective view showing
a balance weight according to a fourth embodiment of the present
disclosure.
[0133] Referring to FIG. 9, the balance weight 730 may be coupled
to the rotatable shaft 300 while sliding along a clearance D.
[0134] In this connection, the balance weight 730 may be slidably
coupled to the rotatable shaft 300 while the weight slides from an
opposite side to the stopping shoulder 301 thereto.
[0135] The rotor 210 of the motor 200 may then be coupled to the
rotatable shaft 300 in the same direction in which the balance
weight 730 slides. That is, the rotor 210 of the motor 200 may be
press-fitted with the rotatable shaft 300 from an opposite side to
the stopping shoulder 301 thereto.
[0136] Thus, the rotor 210 may be press-fitted with the rotatable
shaft 300 until the rotor 210 of the motor 200 is in contact with
and is fixed to the balance weight 730.
[0137] In this way, the coupling portion 733 of the balance weight
720 may be firmly fixed to and between the stopping shoulder 301 of
the rotatable shaft 300 and the rotor 210 of the motor 200.
[0138] In this connection, the balance weight 730 may include an
anti-rotation mechanism 734 and 735 to prevent the balance weight
730 from rotating independently of the rotatable shaft 300 and
rotor 210. That is, the anti-rotation mechanism 734 and 735 may be
configured to disallow the balance weight 730 to rotate
independently of the rotatable shaft 300 and rotor 210 and to allow
the balance weight 730 to rotate integrally with the rotor 210 of
the rotatable shaft 300 and the motor 200.
[0139] In the present embodiment, the anti-rotation mechanism may
include a pin 735 installed on the motor rotor 210 and a pin hole
734 defined in the coupling portion 733 and receiving the pin
735.
[0140] Referring to FIG. 10, a shape of the pin hole 734 formed in
the balance weight 730 is shown.
[0141] Further, the balance weight 730 may include a coupling
portion 733 having an inner opening 731 defined therein receiving
the rotatable shaft 300 and coupled to and between the motor rotor
210 and the frame 410, and a weight portion 732 extending from an
outer periphery of the coupling portion 733.
[0142] FIG. 11 is a plan view showing a shape of the coupled hole
and pin hole of the balance weight according to a fourth embodiment
of the present disclosure.
[0143] As shown in (a) in FIG. 11, an entirety of the pin hole 734
formed in the coupling portion 733 may be located inside the
circumference of the coupling portion 733. Alternatively, as shown
in (b) and (c) in FIG. 11, at least a portion of the pin hole 734
formed in the coupling portion 733 may be located outside the
circumference of the coupling portion 733.
[0144] Accordingly, a position of the pin 735 inserted to the pin
hole 734 may be adjusted.
[0145] Descriptions of remaining components may be the same at
those of at least one of the first to fourth embodiments as
described above.
[0146] FIG. 12 is a schematic diagram showing a process of
installing a balance weight according to a fifth embodiment of the
present disclosure.
[0147] Referring to FIG. 12, the balance weight 740 may be coupled
to the rotatable shaft 300 while sliding along a clearance D.
[0148] In this connection, the balance weight 740 may be slidably
coupled to the rotatable shaft 300 while the weight slides from an
opposite side to the stopping shoulder 301 thereto.
[0149] The rotor 210 of the motor 200 may then be coupled to the
rotatable shaft 300 in the same direction in which the balance
weight 740 slides. That is, the rotor 210 of the motor 200 may be
press-fitted with the rotatable shaft 300 from an opposite side to
the stopping shoulder 301 thereto.
[0150] Thus, the rotor 210 may be press-fitted with the rotatable
shaft 300 until the rotor 210 of the motor 200 is in contact with
and is fixed to the balance weight 740.
[0151] In this way, the coupling portion 743 of the balance weight
740 may be firmly fixed to and between the stopping shoulder 301 of
the rotatable shaft 300 and the rotor 210 of the motor 200.
[0152] In this connection, the balance weight 740 may include an
anti-rotation mechanism 744 and 745a to prevent the balance weight
740 from rotating independently of the rotatable shaft 300 and
rotor 210. That is, the anti-rotation mechanism 744 and 745a may be
configured to disallow the balance weight 740 to rotate
independently of the rotatable shaft 300 and rotor 210 and to allow
the balance weight 740 to rotate integrally with the rotor 210 of
the rotatable shaft 300 and the motor 200.
[0153] In this embodiment, the anti-rotation mechanism may include
a rivet head 745a for fixing iron plates of the motor rotor 210 to
each other, and a rivet hole 744 receiving the head 745a.
[0154] The motor rotor 210 may be composed of a plurality of iron
plates around which an iron core is wound. A rivet 745 may fix the
multiple iron plates to each other.
[0155] The anti-rotation mechanism may employ this rivet 745. That
is, the rivet hole 744 receiving the head 745a of the rivet 745 may
be formed in the coupling portion 743 of the balance weight 740 to
prevent the balance weight 740 from rotating independently of the
rotatable shaft 300 and the rotor 210.
[0156] Descriptions of remaining components may be the same at
those of at least one of the first to fourth embodiments as
described above.
[0157] FIG. 13 is a schematic diagram showing a process of
installing a balance weight according to a sixth embodiment of the
present disclosure.
[0158] Referring to FIG. 13, the balance weight 750 may be coupled
to the rotatable shaft 300 while sliding along a clearance D.
[0159] In this connection, the balance weight 750 may be slidably
coupled to the rotatable shaft 300 while the weight slides from an
opposite side to the stopping shoulder 301 thereto.
[0160] The rotor 210 of the motor 200 may then be coupled to the
rotatable shaft 300 in the same direction in which the balance
weight 750 slides. That is, the rotor 210 of the motor 200 may be
press-fitted with the rotatable shaft 300 from an opposite side to
the stopping shoulder 301 thereto.
[0161] Thus, the rotor 210 may be press-fitted with the rotatable
shaft 300 until the rotor 210 of the motor 200 is in contact with
and is fixed to the balance weight 750.
[0162] In this way, the coupling portion 753 of the balance weight
750 may be firmly fixed to and between the stopping shoulder 301 of
the rotatable shaft 300 and the rotor 210 of the motor 200.
[0163] In this connection, the weight 750 may include an extended
coupling part 754 extending from the coupling portion 753 of the
balance weight 750. The extended coupling part 754 has a width
corresponding to a spacing between the stopping shoulder 301 and
the motor rotor 210.
[0164] A spacing between the balance weight 750 and the motor rotor
210 may be relatively large depending on an overall construction of
the compressor. That is, the distance between the balance weight
750 and the motor rotor 210 may be larger than a thickness of the
coupling portion 753 which has a plate shape.
[0165] In this case, the balance weight 750 may include the
extended coupling part 754 extending from coupling portion 753.
That is, the width of the extended coupling part 754 may correspond
to the spacing between the balance weight 750 and the motor rotor
210 in the compressor.
[0166] Descriptions of remaining components may be the same at
those of at least one of the first to fifth embodiments as
described above.
[0167] Details as described in one embodiment may be equally
applied to other embodiments unless they are mutually exclusive to
each other.
[0168] In the scroll type compressor as described above, the
balance weight may be fixedly assembled while press-fitting the
motor rotor with the rotatable shaft, thus manufacturing and
assembling the balance weight in a relatively small number of
processes.
[0169] Further, there is no need for the large thickness to secure
the press-fitted face for being press-fitted with the rotatable
shaft, so that the balance weight may be manufactured and assembled
using a relatively thin plate material.
[0170] Further, the balance weight itself may be slidably coupled
to the shaft instead of press-fitting the weight to the shaft, so
that no additional process or precision machining for securing the
press-fitted face is necessary.
[0171] The embodiments of the present disclosure as disclosed in
the present specification and drawings are merely presented by way
of example for clarity of understanding and is not intended to
limit the scope of the present disclosure thereto. It is apparent
to those skilled in the art that other modifications based on the
technical spirit of the present disclosure may be implemented in
addition to the embodiments disclosed herein.
* * * * *