U.S. patent application number 13/129989 was filed with the patent office on 2011-09-15 for gas compressor.
This patent application is currently assigned to Calsonic Kansel Corporation. Invention is credited to Hiroshi Iijima.
Application Number | 20110223052 13/129989 |
Document ID | / |
Family ID | 42198130 |
Filed Date | 2011-09-15 |
United States Patent
Application |
20110223052 |
Kind Code |
A1 |
Iijima; Hiroshi |
September 15, 2011 |
GAS COMPRESSOR
Abstract
A gas compressor includes a cylinder block, a rear side block, a
front side block, a cylinder chamber segmented by the above three
blocks, a rotor provided in the cylinder chamber, vane slots formed
on the rotor, vanes inserted into the vane slots, and a suction
hole provided on at least one of the front and rear side blocks.
Refrigerant is suctioned into the cylinder chamber from the suction
hole. An opening edge of the suction hole is composed of an
in-chamber opening edge that locates within the cylinder chamber
and an in-block opening edge that faces to a sidewall of the
cylinder block. The in-chamber opening edge locates on a side of an
oval inner wall away from an outer circumference of the rotor.
According to the gas compressor, leaning of the vanes is
restrained, so that ground damage or attrition of the blocks,
vibrations and noises are restrained.
Inventors: |
Iijima; Hiroshi; (Saitama,
JP) |
Assignee: |
Calsonic Kansel Corporation
Saitama
JP
|
Family ID: |
42198130 |
Appl. No.: |
13/129989 |
Filed: |
October 30, 2009 |
PCT Filed: |
October 30, 2009 |
PCT NO: |
PCT/JP2009/068650 |
371 Date: |
May 18, 2011 |
Current U.S.
Class: |
418/259 |
Current CPC
Class: |
F04C 2270/12 20130101;
F04C 2250/101 20130101; F04C 29/12 20130101; F04C 18/3446 20130101;
F04C 2270/13 20130101 |
Class at
Publication: |
418/259 |
International
Class: |
F04C 29/12 20060101
F04C029/12 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 19, 2008 |
JP |
2008-296004 |
Claims
1. A gas compressor comprising: a cylinder block; a rear side block
and a front side block that are disposed on both sides of the
cylinder block, respectively; a cylinder chamber that is formed in
the cylinder block so as to be surrounded by the cylinder block,
the rear side block and the front side block; an oval inner wall
that is formed by an inner wall of the cylinder block and faces to
the cylinder chamber; a rotor rotatably provided in the cylinder
chamber; a plurality of vane slots that is formed on the rotor; a
plurality of vanes that is inserted in the plurality of vane slots,
respectively, so as to be able to reciprocate therewithin; and a
suction hole that is provided at least one of the front side block
and the rear side block and through which refrigerant is suctioned
into the cylinder chamber, wherein an opening edge of the suction
hole is composed of an in-chamber opening edge that locates between
the oval inner wall and an outer circumference of the rotor and an
in-block opening edge that faces to an sidewall of the cylinder
block, and the in-chamber opening edge locates on a side of the
oval inner wall away from the outer circumference of the rotor.
2. The gas compressor according to claim 1, wherein a contact
portion with which a side edge of the vane contacts is provided, on
at least one of the front side block and the rear side block,
between the in-chamber opening edge and the outer circumference of
the rotor.
3. The gas compressor according to claim 1, wherein the in-chamber
opening edge has an arch shape from a vicinity of a minor axis line
of the cylinder chamber toward a major axis line thereof.
4. The gas compressor according to claim 1, wherein the in-chamber
opening edge has an arch shape, and a center of the arch shape is
offset to a rotational center of the rotor so as to distance the
in-chamber opening edge gradually away from the outer circumference
of the rotor.
Description
TECHNICAL FIELD
[0001] The present invention relates to a rotary vane gas
compressor that will be applied to an air-conditioner for a vehicle
and so on.
BACKGROUND ART
[0002] In a rotary vane gas compressor, cylinder chambers are
formed by a cylinder block, and a rear side block and a front side
block that are disposed on both sides of the cylinder block. Then,
a rotor is disposed rotatably in the cylinder chamber. An internal
space of the cylinder chamber is surrounded by an oval inner wall.
Vanes inserted in vane slots on the rotor segments the internal
space of the cylinder chamber to form plural compression chambers.
A suction hole formed on the front side block communicates with the
cylinder chamber. Refrigerant is suctioned into the cylinder
chamber through the suction hole. Suctioned refrigerant is
compressed by the vanes along with a rotation of the rotor, and
then discharged to a refrigeration cycle (for example, Japanese
Patent Application Laid-Open No. H6-288372 [Patent Document 1], and
Japanese Patent Application Laid-Open No. 2005-2826 [Patent
Document 2]).
[0003] FIG. 4 shows an internal configuration of a cylinder chamber
100 in a conventional gas compressor. A rotor 120 is housed
rotatably in an interior space of the cylinder chamber 100. A shaft
125 is disposed integrally at a center of the rotor 120. Plural
vane slots 130 are formed on the rotor 120. Vanes 140 are inserted
in the vane slots 130, respectively, so as to be able to
reciprocate therewithin.
[0004] An interior space of the cylinder chamber 100 is surrounded
by an oval inner wall 110. Each end edge of the vanes 140 contacts
with the oval inner wall 110, and the cylinder chamber 100 is
segmented into plural compression chambers. A front side block 160
constitutes one wall portion of the cylinder chamber 100. A suction
hole 170 is opened on the front side block 160. A suction channel
165 penetrates a cylinder block to communicate the suction hole 170
on the front side block with a suction hole (not shown) on a rear
side block. The suction hole 170 communicates with a suction port
(not shown) of refrigerant. A portion of the suction hole 170 opens
in the cylinder chamber 100 (positions within the oval inner wall
110). The refrigerant is suctioned from the said opening into the
cylinder chamber 100. An opening edge (in-chamber opening edge) 175
of the said opening has a circular arch outline about an axis 127
of the rotor 120 (shaft 125), and extends along an outer
circumference of the rotor 120. Namely, the outer circumference of
the rotor 120 rotates along the in-chamber opening edge 175.
SUMMARY OF INVENTION
[0005] However, in the above-mentioned conventional configuration,
it may occur, on an activation of the gas compressor, that the
vanes 140 don't contact with the oval inner wall 110. In this case,
the vane 140 may lean, so that an end of a side edge of the vane
140 may get into the suction hole 170. If the rotor 120 rotates
from this state, the end of the vane 140 may jam with an end edge
of the suction hole 170. As a result, problems may occur such as
ground damage or attrition of the front side block 160 or the vanes
140, vibrations and noises.
[0006] If a reciprocating amount of the vanes 140 is made small in
order to prevent these problems, it will be needed to enlarge the
cylinder chamber 100 along the axis 127 in order to ensure a
capacity. In this case, problems such as expansion in size or
increase of weight of the gas compressor may occur.
[0007] Therefore, an object of the present invention is to provide
a gas compressor that can restrain ground damage or attrition of
side blocks or vanes, vibrations and noises by restraining leaning
of the vanes.
[0008] An aspect of the present invention provides a gas compressor
that includes: a cylinder block; a rear side block and a front side
block that are disposed on both sides of the cylinder block,
respectively; a cylinder chamber that is formed in the cylinder
block so as to be surrounded by the cylinder block, the rear side
block and the front side block; an oval inner wall that is formed
by an inner wall of the cylinder block and faces to the cylinder
chamber; a rotor rotatably provided in the cylinder chamber; a
plurality of vane slots that is formed on the rotor; a plurality of
vanes that is inserted in the plurality of vane slots,
respectively, so as to be able to reciprocate therewithin; and a
suction hole that is provided at least one of the front side block
and the rear side block and through which refrigerant is suctioned
into the cylinder chamber. An opening edge of the suction hole is
composed of an in-chamber opening edge that locates between the
oval inner wall and an outer circumference of the rotor and an
in-block opening edge that faces to a sidewall of the cylinder
block. The in-chamber opening edge locates on a side of the oval
inner wall away from the outer circumference of the rotor.
[0009] According to the above aspect, a side end edge of the vane
is faultlessly supported by the front side block by locating the
in-chamber opening edge of the suction hole on a side of the oval
inner wall away from the outer circumference of the rotor.
Therefore, leaning of the vanes is restrained, so that ground
damage or attrition of the front side block, vibrations and noises
are restrained.
[0010] Here, it is preferable that a contact portion with which a
side edge of the vane contacts is provided, on at least one of the
front side block and the rear side block, between the in-chamber
opening edge and the outer circumference of the rotor.
[0011] In addition, it is preferable that the in-chamber opening
edge has an arch shape from a vicinity of a minor axis line of the
cylinder chamber toward a major axis line thereof.
[0012] In addition, it is preferable that the in-chamber opening
edge has an arch shape, and a center of the arch shape is offset to
a rotational center of the rotor so as to distance the in-chamber
opening edge gradually away from the outer circumference of the
rotor.
BRIEF DESCRIPTION OF DRAWINGS
[0013] [FIG. 1] is a cross-sectional view of a gas compressor in an
embodiment according to the present invention.
[0014] [FIG. 2] is an explanatory drawing of a cylinder chamber in
the gas compressor.
[0015] [FIG. 3] is an enlarged explanatory drawing showing an
interior of the cylinder chamber.
[0016] [FIG. 4] is an enlarged explanatory drawing of a cylinder
chamber in a conventional gas compressor.
DESCRIPTION OF EMBODIMENT
[0017] Hereinafter, an embodiment according to the present
invention will be explained with reference to drawings.
[0018] A gas compressor 1 in the present embodiment is a rotary
vane compressor. As shown in FIG. 1, the gas compressor 1 includes
a case 2 and a compression mechanism 5.
[0019] The case 2 has a bottomed cylindrical shape in which its
rear end is closed by a bottom wall 2b. The compression mechanism 5
and a gas-fluid separation unit 6 are housed in a housing portion
2c of the case 2. A discharge port 18 of the refrigerant is formed
at an upper portion of the case 2. An opening 2a is formed at a
front end of the case 2. A front head 3 is fixed to the case 2 on
its side of the opening 2a. A suction port 17 for suctioning the
refrigerant toward the compression mechanism 5 is formed on the
front head 3. The suction port 17 communicates with a suction
chamber 10, and the suction chamber 10 communicates with suction
hole 22 (see FIG. 3) formed on a front side block 13. Therefore,
the refrigerant passes through the suction port 17, the suction
chamber 10 and the suction hole 22, and then suctioned into the
compression mechanism 5. The suction hole 22 on the front side
block 13 will be explained later.
[0020] The compression mechanism 5 includes a cylinder housing 7
and a rotor 8 disposed in the cylinder housing 7. The cylinder
housing 7 includes a cylinder block 11, and a rear side block 12
and the front side block 13 that are disposed on both sides of the
cylinder block 11. A cylinder chamber 15 is formed so as to be
surrounded by the cylinder block 11, the rear side block 12 and the
front side block 13. Namely, an end face 13a, which is on a side of
the cylinder block 11, of the front side block 13 abuts on the
cylinder block 11, and an end face 12a, which is on a side of the
cylinder block 11, of the rear side block 12 abuts on the cylinder
block 11. Therefore, the cylinder chamber 15 is formed by the
cylinder block 11 and both of the side blocks 12 and 13.
[0021] As shown in FIG. 2, the cylinder chamber 15 has an oval
shape, and its inner wall surface is an oval inter wall 19.
[0022] The rotor 8 is disposed rotatably in the cylinder chamber
15. The rotor 8 is integrated with a shaft 9. A rear portion of the
shaft 9 is rotatably supported by the rear side block 12, and a
front portion thereof is rotatably supported by the front side
block 13. When a rotational drive force of the engine is
transmitted to the shaft 9, the rotor 8 rotates in the cylinder
chamber 15 to compress the refrigerant.
[0023] As shown in FIG. 2, plural vane slots 8a is formed on the
rotor 8 long its circumferential direction. Vane 16 are inserted
the vane slots 8a, respectively, so as to be able to reciprocate
therewithin. The plural vanes 16 are disposed in the cylinder
chamber 15 along an axial direction of the shaft 9 (lateral
direction in FIG. 1). Then, side end edges of each of the vanes 16
in the axial direction abut on the above-explained end faces 12a
and 13a of the rear side block 12 and the front side block 13. In
addition, the vanes 16 protrude from the vane slots 8a,
respectively, and each end edge 16a thereof contacts with the oval
inner wall 19. The side end edges of the vanes 16 contact with the
end faces 12 a and 13a and the end edges 16a of the vanes 16
contact with the oval inner wall 19, so that the cylinder chamber
15 is segmented into plural compression chambers.
[0024] The gas-fluid separation unit 16 is disposed on a rear side
of the rear side block 12, as shown in FIG. 1. The refrigerant that
has been compressed in the cylinder chamber 15 is introduced into
the gas-fluid separation unit 16. The introduced refrigerant is
separated into gas and fluid in the gas-fluid separation unit 6.
Separated oil drops off to a lower portion of the gas-fluid
separation unit 6, and thereby is circulated in the compressor 1 to
lubricate parts of the compressor 1.
[0025] In the above-explained configuration, the refrigerant is
suctioned from the suction port 17 provided on the front head 3,
and the supplied to the compression chambers of the cylinder
chamber 15 through the suction chamber 10 and the suction hole 22.
At this moment, the refrigerant is supplied to the compression
chambers also from a suction hole on the rear side block through a
suction channel 20 (explained later) formed on the cylinder block
11. Then, the refrigerant is compressed due to volume decreasing of
the compression chamber along with the rotation of the rotor 8. The
refrigerant compressed in the compression chambers is introduced
into the gas-fluid separation unit 6, and then discharged to the
refrigeration cycle from the discharge port 18 after oils are
separated away in the gas-fluid separation unit 6.
[0026] The oil separated in the gas-fluid separation unit 6 drops
off to the housing portion 2c of the case 2, and then it is
circulated among the shaft 9 and the blocks 11, 12 and 13 through
an oil channel 32 formed on the rear side block 12, an oil channel
33 formed on the cylinder block 11 and an oil channel 34 formed on
the front side block 13 to lubricate various parts.
[0027] Next, suction mechanism of the refrigerant into the cylinder
chamber 15 in the present embodiment will be explained with
reference to FIG. 3. The rotor 8 is provided rotatably in the
cylinder chamber 15 having the oval inner wall 19, and the
refrigerant is suctioned into the cylinder chamber 15 from the
suction hole 22 on the front side block 13. In addition, one of the
side end edges of the vane 16 abuts on the end face 13a of the
front side block 13. In this manner, the one of the side end edges
of the vane 16 is supported by the end face 13a because the one of
the side end edges of the vane 16 abuts on the end face 13a.
[0028] The suction hole 22 on the front side block 13 communicates
with the suction hole (not shown) formed on the rear side block 12
via the suction channel 20 formed on the cylinder block 11. The
refrigerant is supplied into the cylinder chamber 15 from the
suction hole 22 and also supplied into the cylinder chamber 15 from
the suction hole on the rear side block through the suction channel
20. The suction hole (not shown) on the rear side block 12 has a
shape symmetrical to a shape of the suction hole 22 on the front
side block 13 and communicates with the suction channel 20.
[0029] In this case, the suction hole 22 is formed as a larger
passage that the suction channel 20.
[0030] An opening edge of the suction hole 22 has a combined shape
of an in-block opening edge 23 and an in-chamber opening edge 24.
The in-block opening edge 23 faces to a sidewall of the cylinder
block 11. On the other hand, the in-chamber opening edge 24 is
located between the oval inner wall 19 of the cylinder chamber 15
and the outer circumference of the rotor 8. Therefore, the
in-chamber opening edge 24 locates within the cylinder chamber 15.
The refrigerant is suctioned from an area on a side of the
in-chamber opening edge 24 within the suction hole 22.
[0031] In the resent embodiment, the in-chamber opening edge 24 is
formed so as to locate on a side of the oval inner wall 9 away from
the outer circumference (outer circumferential edge) of the rotor
8. In other words, the in-chamber opening edge 24 and the outer
circumference of the rotor 8 don't coincide with each other, the
end face 13a (an after-mentioned contact portion G) of the front
side block 13 exists between the outer circumference (outer
circumferential edge) of the rotor 8 and the in-chamber opening
edge 24. In further other words, the in-chamber opening edge 24 is
distanced from the outer circumference (outer circumferential edge)
of the rotor 8.
[0032] In addition, the in-chamber opening edge 24 has an arch
shape from a vicinity of a minor axis line 25 of the cylinder
chamber 15 having an oval shape toward a major axis line 26
thereof. A center 28 of the arch shape of the in-chamber opening
edge 24 is located offset to a rotational center 30 of the rotor 8
(shaft 9). The offset position of the center 28 is set so as to
distance the in-chamber opening edge 24 gradually away from the
outer circumference of the rotor 8 from the vicinity of the minor
axis line 25 toward the major axis line 26.
[0033] The in-chamber opening edge 24 set as mentioned above faces
to the outer circumference of the rotor 8, but the contact portion
G is disposed between the in-chamber opening edge 24 and the outer
circumference of the rotor 8. Therefore, the one of the side end
edges of the vane 16 contacts with the end face 13a of the front
side block 13 and the contact portion G. As a result, the side end
edge of the vane 16 can be supported by the end face 13a. Namely,
the contact portion G of the end face 13a contacts with the side
end edge of the vane 16 to support the vane 16.
[0034] In the above-described embodiment, even if the vanes 16
don't contact with the oval inner wall 19 on an activation of the
gas compressor 1, the vanes 16 can be supported by the contact
portion G on the end face 13a of the front side block 13 or the end
face 12a of the rear side block 12. Therefore, leaning of the vanes
16 can be restrained. Therefore, leaning of the vanes 16 is
restrained, so that the vanes 16 and the suction hole 22 is not
jammed with each other. As a result, ground damage or attrition of
the front side block 13 or the rear side block 12, vibrations and
noises can be restrained. Further, since it is not needed to make a
reciprocating amount of the vanes 16 small, it is not needed to
enlarge the cylinder chamber 15. Therefore, expansion in size or
increase of weight of the gas compressor can be restrained.
* * * * *