U.S. patent application number 14/116705 was filed with the patent office on 2014-05-01 for scroll -type compressor.
The applicant listed for this patent is Masahiro Iguchi, Jiro Iizuka, Makoto Ijiri, Masamichi Kubota, Yuuji Oiwake, Masaaki Takahata. Invention is credited to Masahiro Iguchi, Jiro Iizuka, Makoto Ijiri, Masamichi Kubota, Yuuji Oiwake, Masaaki Takahata.
Application Number | 20140119972 14/116705 |
Document ID | / |
Family ID | 47176787 |
Filed Date | 2014-05-01 |
United States Patent
Application |
20140119972 |
Kind Code |
A1 |
Ijiri; Makoto ; et
al. |
May 1, 2014 |
Scroll -Type Compressor
Abstract
A housing forms one portion of a compressor case and supports a
bearing for a main shaft has an opening through which gas Is
sucked; a suction space extending from the opening to inside of the
compressor; a first gas passageway extending from the suction space
in the direction of the axis of the main shaft; a second gas
passageway connecting the first gas passageway and the space in
which the main shaft bearing is disposed. A shell forms the other
portion of the compressor case and is fastened to the housing has a
third gas passageway connecting the first gas passageway and the
internal space of a compression mechanism. The first gas passageway
and the third gas passageway are connected to each other further on
the outer side of the main shaft in the rotation radius direction
than the movable region of the bottom plate of a movable
scroll.
Inventors: |
Ijiri; Makoto; (Isesaki-shi,
JP) ; Takahata; Masaaki; (Isesaki-shi, JP) ;
Oiwake; Yuuji; (Isesaki-shi, JP) ; Iizuka; Jiro;
(Isesaki-shi, JP) ; Kubota; Masamichi; (Wako-shi,
JP) ; Iguchi; Masahiro; (Wako-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Ijiri; Makoto
Takahata; Masaaki
Oiwake; Yuuji
Iizuka; Jiro
Kubota; Masamichi
Iguchi; Masahiro |
Isesaki-shi
Isesaki-shi
Isesaki-shi
Isesaki-shi
Wako-shi
Wako-shi |
|
JP
JP
JP
JP
JP
JP |
|
|
Family ID: |
47176787 |
Appl. No.: |
14/116705 |
Filed: |
May 7, 2012 |
PCT Filed: |
May 7, 2012 |
PCT NO: |
PCT/JP2012/061634 |
371 Date: |
January 16, 2014 |
Current U.S.
Class: |
418/55.6 ;
418/55.1 |
Current CPC
Class: |
F04C 29/12 20130101;
F04C 2240/56 20130101; F01C 21/10 20130101; F04C 18/0215 20130101;
F04C 27/005 20130101; F04C 29/028 20130101; F04C 2240/807 20130101;
F04C 29/04 20130101 |
Class at
Publication: |
418/55.6 ;
418/55.1 |
International
Class: |
F04C 29/02 20060101
F04C029/02; F04C 18/02 20060101 F04C018/02 |
Foreign Application Data
Date |
Code |
Application Number |
May 13, 2011 |
JP |
2011-108350 |
Claims
1. A scroll-type compressor comprising: a housing which forms one
portion of a compressor case and which supports a bearing for a
main shaft having an opening through which a gas to be compressed
is sucked, a suction space extending with a cylindrical-shape from
the opening into the compressor, a first gas passageway extending
from the suction space along a rotation axis of the main shaft, and
a second gas passageway communicating with the first gas passageway
and a space in which the bearing is disposed; and a shell which
forms the other portion of the compressor case and which is
fastened to the housing having a third gas passageway communicating
with the first gas passageway and an internal space of a
compression mechanism, characterized in that the first gas
passageway and the third gas passageway communicate with each other
at an outer side than a region where a bottom plate of a movable
scroll can move with respect to a direction of a turning radius of
the main shaft.
2. The scroll-type compressor according to claim 1, wherein the
housing has a lubricating oil passageway which is independent from
the first gas passageway and communicates with the suction space
and the space in which the bearing is disposed.
3. The scroll-type compressor according to claim 2, wherein a
porous filling material is filled in a neighborhood of a portion
which the suction space and the lubricating oil passageway
communicate with each other.
4. The scroll-type compressor according to claim 1, wherein the
housing and the shell are fastened with a plurality of fastening
means so that the first gas passageway and the third gas passageway
communicate with each other in a region between the fastening means
which are adjacent to each other.
5. The scroll-type compressor according to claim 1, wherein the
suction space extends inward along the turning radius of the main
shaft.
6. The scroll-type compressor according to claim 1, wherein the
bearing is disposed as opening on a container space where a
counterweight is placed.
7. The scroll-type compressor according to claim 1, wherein a fixed
scroll is formed integrally with the shell.
8. The scroll-type compressor according to claim 1, wherein a fin
structure is formed inside the first gas passageway.
9. The scroll-type compressor according to claim 1, wherein the
first gas passageway is formed on a side surface of the suction
space.
10. The scroll-type compressor according to claim 9, wherein the
suction space extends to a level lower than the first gas
passageway in a vertical direction.
Description
TECHNICAL FIELD OF THE INVENTION
[0001] The present invention relates to a scroll-type compressor
having a front housing with multipath gas passageways through which
the gas to be compressed is sucked.
BACKGROUND ART OF THE INVENTION
[0002] There have been various suggested gas passageway structures
through which refrigerant gas or the like to be compressed is
sucked into a scroll-type compressor so that lubricating oil
contained in the gas to be compressed achieves the lubrication in
the compressor.
[0003] Patent document 1 discloses a scroll-type compressor
provided with a main suction hole and auxiliary suction hole in a
front housing. Patent document 2 discloses a scroll compressor of
which passageway for a lubricant mist and a working medium flowing
from a suction hole comprises two circuits (first circuit and
second circuit).
[0004] Patent document 3 discloses a scroll compressor provided
with a plurality of suction passageways so that lubricating oil in
the refrigerant passes by a sliding contact portion such as main
shaft bearing through the suction passageways.
PRIOR ART DOCUMENTS
Patent Documents
[0005] Patent document 1: JP-3227075-B
[0006] Patent document 2: JP-9-32745-A
[0007] Patent document 3: JP-4106088-B
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0008] A scroll-type compressor should be designed to prevent an
excessive superheat degree of the suction gas in case that the
pressure loss in the gas passageway from the suction port of the
housing to the compression chamber sectioned with scroll walls to
determine the suction displacement or the heat received from the
sliding contact portion might increase the superheat degree of the
suction gas. However, any conventional scroll-type compressors
don't have a structure capable of satisfying both the prevention of
excessive superheat of the suction gas and the lubrication of
bearing, lip seal and thrust plate.
[0009] Accordingly, it could be helpful to provide a scroll-type
compressor capable of achieving both the prevention of excessive
superheat of the suction gas and the lubrication of bearing, lip
seal, thrust plate and the like.
Means for Solving the Problems
[0010] To achieve the above-described object, a scroll-type
compressor according to the present invention is a scroll-type
compressor comprising: a housing which forms one portion of a
compressor case and which supports a bearing for a main shaft
having an opening through which a gas to be compressed is sucked, a
suction space extending with a cylindrical-shape from the opening
into the compressor, a first gas passageway extending from the
suction space along a rotation axis of the main shaft, and a second
gas passageway communicating with the first gas passageway and a
space in which the bearing is disposed; and a shell which forms the
other portion of the compressor case and which is fastened to the
housing having a third gas passageway communicating with the first
gas passageway and an internal space of a compression mechanism,
characterized in that the first gas passageway and the third gas
passageway communicate with each other at an outer side than a
region where a bottom plate of a movable scroll can move with
respect to a direction of a turning radius of the main shaft.
[0011] Such a scroll-type compressor makes it possible that the
above-described suction space and the first to third gas
passageways control the superheat degree of the suction gas
appropriately and lubricate the bearing for the main shaft and the
sliding contact portion around the compression mechanism
effectively. Particularly because the first gas passageway and the
third gas passageway communicate with each other at the outer side
than the movable region of the bottom plate of the movable scroll,
the bottom plate does not block the portion at which the
passageways communicate with each other even when the main shaft
rotates to swing the movable scroll, so that the suction gas flows
in the gas passageways properly.
[0012] In the scroll-type compressor, it is preferable that the
housing has a lubricating oil passageway which is independent from
the first gas passageway and communicates with the suction space
and the space in which the bearing is disposed. With such a
lubricating oil passageway, the lubricating oil contained in the
refrigeration gas or the like to be compressed which has been
sucked from the opening on the housing could be delivered directly
to the bearing for the main shaft from the suction space without
going through the first gas passageway.
[0013] In such a scroll-type compressor, it is preferable that a
porous filling material is filled in a neighborhood of a portion
which the suction space and the lubricating oil passageway
communicate with each other. The porous filling material may be
made of a porous material such as sponge and sintered metal, and
alternatively made of a fiber material such as steel wool and
porous filter. With such a porous filling material filled in the
communicating portion between the suction space and the lubricating
oil passageway, the lubricating oil contained in the suction gas
could be trapped to be efficiently delivered to the lubricating oil
passageway, so that the bearing is improved further in the
lubricity.
[0014] In the scroll-type compressor, it is preferable that the
housing and the shell are fastened with a plurality of fastening
means while the first gas passageway and the third gas passageway
communicate with each other in a region between the fastening means
which are adjacent to each other. With such fastening means such as
bolts fastening the housing and the shell, the gas passageways
could be configured to communicate with each other in the region
between the adjacent bolts or the like, so that the compressor case
is made compact.
[0015] In the scroll-type compressor, it is preferable that the
suction space extends inward along the turning radius of the main
shaft. With such a suction space extending toward the inside along
the turning radius of the main shaft, more preferably configured to
extend perpendicular to the main shaft, the suction gas containing
the lubricating oil could be easily led close to the sliding
contact portion such as bearing required to be highly
lubricated.
[0016] Such a scroll-type compressor is suitable to a scroll-type
compressor of which fixed scroll is formed integrally with the
shell. With a scroll-type compressor provided with a fixed scroll
integral with the shell to which the present invention has been
applied, the superheat degree of the suction gas could be
controlled appropriately without an additional peripheral port
provided.
[0017] In the scroll-type compressor, it is preferable that a fin
structure is formed inside the first gas passageway. With such a
fin structure, the lubricating oil contained in the suction gas
flowing in the first gas passageway could be trapped effectively.
The lubricating oil trapped with the fin structure is delivered
through the second gas passageway into the space in which the
bearing is disposed so that the neighborhood of the bearing is
improved in lubricity, and is delivered through the third gas
passageway to the compression mechanism side so that the
neighborhood of the compression mechanism is improved in
lubricity.
[0018] In the scroll-type compressor, it is preferable that the
first gas passageway is formed on a side surface of the suction
space. With such a first gas passageway formed on the side of the
suction space, the gas to be compressed flowing in the suction
space could configure a flow bending at a right angle when flows
into the first gas passageway. The lubricating oil in the gas to be
compressed is subject to an inertial force at the bending portion
of the gas flow, and therefore a part of the lubricating oil
accumulates in the suction space without flowing into the first gas
passageway. Thus with such a simple separation mechanism, the
lubricating oil in the gas to be compressed could be trapped
selectively.
[0019] In the scroll-type compressor, it is preferable that the
suction space extends to a level lower than the first gas
passageway in a vertical direction. With such configured suction
space, the lubricating oil trapped with the above-described simple
separation mechanism could be stored at the bottom of the suction
space, so that the trapped lubricating oil is efficiently supplied
to each sliding contact portion if the suction space is provided
with the lubricating oil passageway or the like at the bottom.
Effect According to the Invention
[0020] The scroll-type compressor according to the present
invention makes it possible that the suction gas flow is kept in a
good flow condition while the superheat degree of the suction gas
is controlled appropriately, so that the bearing for the main shaft
and the sliding contact portions around the compression mechanism
are lubricated effectively.
BRIEF EXPLANATION OF THE DRAWINGS
[0021] FIG. 1 shows a scroll-type compressor according to the first
embodiment of the present invention, where (a) is a front view and
(b) is a longitudinal section view of section A-A in (a).
[0022] FIG. 2 shows the scroll-type compressor shown in FIG. 1,
where (a) is a longitudinal section view showing section B-B in
FIG. 1(b) and (b) is a cross section view showing section C-C in
FIG. 1(b).
[0023] FIG. 3 shows a scroll-type compressor according to the
second embodiment of the present invention, where (a) is a
longitudinal section view corresponding to FIG. 2(a) and (b) is a
cross section view corresponding to FIG. 2(b).
[0024] FIG. 4 shows a scroll-type compressor according to the third
embodiment of the present invention, where (a) is a longitudinal
section view corresponding to FIG. 2(a) and (b) is a cross section
view corresponding to FIG. 2(b).
[0025] FIG. 5 shows a scroll-type compressor according to the
fourth embodiment of the present invention, where (a) is a
longitudinal section view corresponding to FIG. 2(a) and (b) is a
cross section view corresponding to FIG. 2(b).
[0026] FIG. 6 is a longitudinal section view corresponding to FIG.
1(b), showing a scroll-type compressor according to the fifth
embodiment of the present invention.
EMBODIMENTS FOR CARRYING OUT THE INVENTION
[0027] Hereinafter, desirable embodiments of the present invention
will be explained with reference to figures.
[0028] FIG. 1 shows a scroll-type compressor according to the first
embodiment of the present invention, where (a) is a front view and
(b) is a longitudinal section view of section A-A in (a). When
compressor 1 is in operation, main shaft 2 rotates to swing movable
scroll 3, so that the gas is compressed by compression mechanism 5
comprising movable scroll 3 and fixed scroll 4. Refrigerant gas to
be compressed is sucked from opening 7 on a side surface of front
housing 6 into suction space 8. Suction space 8 is shaped like a
cylinder extending toward the inside (or downward in FIG. 1) along
the turning radius of main shaft 2 from opening 7. Suction space 8
communicates on the side surface with first gas passageway 9
extending along the rotation axis of main shaft 2. Diverging from
first gas passageway 9, second gas passageway 13 extends toward
bearing 11 for main shaft 2 opening on container space 12 where
counterweight 10 is placed.
[0029] Front housing 6 and shell 15 integral with fixed scroll 4
are fastened with bolts 14 as fastening means. On the contacting
surface between front housing 6 and shell 15, first gas passageway
9 and third gas passageway 16 communicate with each other at an
outer side (or an upper side in the Fig.) than a movable region
where bottom plate 3a of movable scroll 3 can move, with respect to
a direction of the turning radius of main shaft 2. Third gas
passageway 16 extends at the inside of shell 15 along the rotation
axis of main shaft 2 (or toward the right in the Fig.) so that
first gas passageway 9 communicates with internal space 5a of
compression mechanism 5. Because first gas passageway 9 and third
gas passageway 16 communicate with each other at an outer side than
the movable region of bottom plate 3a in the direction of the
turning radius of main shaft 2, such a communication is maintained
even when compressor 1 is in operation.
[0030] On the bottom of suction space 8, lubricating oil passageway
17 extending to container space 12 without going through first gas
passageway 9 as well as lubricating oil passageway 18 extending to
lip seal lubrication space 20 without going through first gas
passageway 9 are provided. Such configured suction space 8
functions as a simple oil separator for separating lubricating oil
from suction gas to be compressed. Namely, the refrigerant
component in the gas to be compressed tends to flow into first gas
passageway 9 communicating with the side of suction space 8 while
the lubricating oil component in the gas to be compressed tends to
flow into lubricating oil passageway 17 communicating with the
bottom of suction space 8. Therefore, the lubricating oil can be
preferentially delivered toward bearing 11 for main shaft 2
required to be highly lubricated.
[0031] FIG. 2 shows compressor 1 shown in FIG. 1, where (a) is a
longitudinal section view showing section B-B in FIG. 1(b) and (b)
is a cross section view showing section C-C in FIG. 1(b). In FIG.
2, first gas passageway 9 extends with approximately uniform cross
section toward shell 15 along the rotation axis of main shaft 2, so
as to have almost the same cross-section shape as third gas
passageway 16 near shell 15.
[0032] FIG. 3 shows scroll-type compressor 31 according to the
second embodiment of the present invention, where (a) is a
longitudinal section view corresponding to FIG. 2(a) and (b) is a
cross section view corresponding to FIG. 2(b). Front housing 32 of
compressor 31 is provided with first gas passageway 33 of which
cross-section has been enlarged along the rotation axis of main
shaft 2 to have a greater curvature and which extends toward shell
35 with almost the same cross-section shape as third gas passageway
34.
[0033] FIG. 4 shows scroll-type compressor 41 according to the
third embodiment of the present invention, where (a) is a
longitudinal section view corresponding to FIG. 2(a) and (b) is a
cross section view corresponding to FIG. 2(b). Front housing 42 of
compressor 41 is provided with first gas passageway 43 of which
cross-section has been enlarged along the rotation axis of main
shaft 2 by a constant ratio and which extends toward shell 45 with
almost the same cross-section shape as third gas passageway 44.
Further, inside first gas passageway 43, fins 46 having greater
surface area extend along the rotation axis of main shaft 2. Such a
structure makes it possible that the lubricating oil in the gas
flowing inside first gas passageway 43 is trapped by fins 46 and is
led by the gravity to a portion by which the movable scroll is
supported as being brought into sliding contact.
[0034] FIG. 5 shows scroll-type compressor 51 according to the
fourth embodiment of the present invention, where (a) is a
longitudinal section view corresponding to FIG. 2(a) and (b) is a
cross section view corresponding to FIG. 2(b). Front housing 52 of
compressor 51 is provided with first gas passageway 53 of which
cross-section has been enlarged along the rotation axis of main
shaft 2 by a constant ratio and which extends toward shell 55 with
almost the same cross-section shape as third gas passageway 54.
Further, a part of first gas passageway 53 is formed as fins 56
extending along the rotation axis of main shaft 2. Such a structure
makes it possible that the lubricating oil in the gas flowing
inside first gas passageway 53 is trapped by fins 56 and is led
through second gas passageway 57 to bearings and the portion by
which the movable scroll is supported as being brought into sliding
contact.
[0035] FIG. 6 is a longitudinal section view corresponding to FIG.
1(b), showing scroll-type compressor 61 according to the fifth
embodiment of the present invention. The bottom of suction space 63
of front housing 62 is filled with porous filling material 64
comprising porous particles or fibers. The filled porous filling
material 64 can trap the lubricating oil component in the gas to be
compressed efficiently, so that the lubricating oil is easily led
to lubricating oil passageway 65, 66. The other configuration is
the same as FIG. 1(b) with its detailed explanation omitted.
INDUSTRIAL APPLICATIONS OF THE INVENTION
[0036] The structure of the scroll-type compressor according to the
present invention is applicable to every scroll-type compressor
required to have a high lubricity on a sliding portion.
EXPLANATION OF SYMBOLS
[0037] 1, 31, 41, 51, 61: compressor [0038] 2: main shaft [0039] 3:
movable scroll [0040] 3a: bottom plate [0041] 4: fixed scroll
[0042] 5: compression mechanism [0043] 5a: internal space [0044] 6,
32, 42, 52, 62: front housing [0045] 7: opening [0046] 8, 63:
suction space [0047] 9, 33, 43, 53: first gas passageway [0048] 10:
counterweight [0049] 11: bearing [0050] 12: container space [0051]
13, 36, 47, 57: second gas passageway [0052] 14: bolt [0053] 15,
35, 45, 55: shell [0054] 16, 34, 44, 54: third gas passageway
[0055] 17, 18, 65, 66: lubricating oil passageway [0056] 20: lip
seal lubrication space [0057] 21: lip seal [0058] 46, 56: fin
[0059] 64: porous filling material
* * * * *