JP2002147378A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently radiate heat of a lap in a scroll compressor. SOLUTION: A cavity 401 is formed along a spiral of the lap 41 on the inside of the lap 41, an outer peripheral side end part is communicated with an operation chamber 104 in the initial stage of reducing the operation chamber 104, an inner peripheral side end part is communicated with a suction space 103, air pushed out of the operation chamber 104 according to reduction in the operation chamber 104 is made to flow in the cavity 401, and the heat of the lap 41 is discharged outside the lap 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art A scroll compressor compresses a fluid to be compressed such as air and sends it out. A movable scroll and a fixed scroll are provided in a cylindrical housing into which the fluid to be compressed is sucked. Can be The movable scroll has a spiral wrap formed on the plate surface of the revolving end plate, and the fixed scroll has a spiral wrap formed on the end wall surface of the housing facing the end plate. Then, the crescent-shaped working chamber formed between the movable scroll wrap and the fixed scroll wrap meshing with each other is reduced in accordance with the revolving motion, and the fluid to be compressed in the working chamber is compressed.

[0003] The scroll type compressor preferably has a small size and a high pressure, but when the pressure is high, the amount of heat generated by adiabatic compression becomes extremely large. For this reason, the wrap thermally expands as the temperature rises, which may cause frictional wear due to contact between the laps or, in the worst case, lock.

As a technology for suppressing the temperature rise of the wrap, there is a technology in which a radiating fin is provided which protrudes outward from the housing wall. However, the radiating path is long, and the radiating efficiency is sufficiently improved against a high pressure rise. You don't get it.

Japanese Patent Laid-Open Publication No. Hei 7-158581 discloses a structure in which air is blown to these fins to perform forced air cooling. There is a turbulence in the air flow to make the air flow to the fins uniform, but only the effect of avoiding excessive rise of some wraps is caused, and the problem of heat dissipation by the fins Is not a fundamental solution.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a scroll-type compressor which has sufficient heat radiation efficiency and can operate well under severe temperature conditions. I do.

[0007]

According to the first aspect of the present invention, a movable wrap is formed by forming a spiral wrap on a plate surface of a revolving end plate in a cylindrical housing into which a fluid to be compressed is sucked. And a fixed scroll formed integrally with the housing and forming a spiral wrap on the plate surface of the end plate facing the movable scroll so that the movable scroll and the wrap engage with each other. A scroll-type compressor that compresses a fluid to be compressed in a working chamber by reducing a crescent-shaped working chamber formed between a wrap of a movable scroll and a wrap of a fixed scroll in accordance with the revolving motion; A cavity extending in the spiral direction of the wrap is formed inside the wrap, and the cavity is communicated with the low temperature part.

Since the cavity inside the high-temperature wrap communicates with the low-temperature portion, the heat of the wrap is discharged to the low-temperature portion, and the cooling efficiency is high.

According to a second aspect of the present invention, in the configuration of the first aspect of the present invention, the wrap having the cavity is formed on an outer surface of the cavity with an opening on a surface facing another wrap which engages with the wrap. Form a communication hole that communicates with the end,
In the end plate, a communication flow path that communicates an inner peripheral end of the cavity and a suction space that communicates with a suction port of the fluid to be compressed on the outer circumference of the working chamber is formed, and The opening position is set so that the communication hole communicates with the working chamber for a certain period of time when the working chamber starts reducing, and the low-temperature part is the suction space.

As the working chamber is reduced, the high-temperature compressed fluid in the cavity is pushed out into the suction space, and the cooling efficiency is further improved.

According to a third aspect of the present invention, in the configuration of the first aspect of the present invention, the one end of the cavity and the suction port of the fluid to be compressed at the outer periphery of the working chamber are provided on the end plate of the scroll. A first communication passage communicating with the suction space communicating with the suction space; and a second communication passage communicating the other end of the cavity with the suction space. And

A pressure distribution is generated in the suction space by the orbital movement of the movable scroll, and an air flow is formed in the cavity by a pressure difference between both ends of the cavity. Thereby, the cooling efficiency is further improved.

According to a fourth aspect of the present invention, in the configuration of the first aspect of the present invention, the cavity is formed inside the fixed scroll, and the heat transport fluid communicates with the housing through one end of the cavity. And a recovery port through which the heat transport fluid returns to the cavity through the other end of the cavity, and the low-temperature section supplies heat to supply the heat transport fluid to the supply port. It is a transportation fluid supply means.

Since the heat transport fluid is forcibly circulated through the cavity, the cooling efficiency is further improved.

[0015]

(First Embodiment) FIGS. 1, 2 and 3 show a scroll compressor to which the present invention is applied. The housing 1 has a substantially cylindrical shape, and a shaft 21 penetrates the housing 1. The shaft 21 includes bearings 23a, 23 provided on both end walls 12a, 12b of the housing 1.
b. Also, bearings 23a, 23b
The annular oil seals 24 a and 24 b are provided between the housing 1 and the shaft 21 at a position near the inner side in the direction of the shaft 21. Power from an electric motor or an internal combustion engine (not shown) is transmitted to the shaft 21 via a pulley 22 connected to the shaft end thereof, and the shaft 21 rotates.

In the housing 1, shafts 21 are respectively formed from end walls 12 a and 12 b of the housing 1 which are end plates.
A spiral wrap 31 having a radius of curvature smaller toward the inner peripheral side is formed therearound to form a fixed scroll 3.

An air suction port 101 is formed in the peripheral wall 11 of the housing 1 so that air to be compressed can be taken in. Also, on one end wall 12b of the housing 1, a plurality of discharge ports 1 are provided on the outer periphery of the bearing 23b.
02 is formed.

An end plate 25 is provided in the housing 1. The end plate 25 is a substantially disk-shaped member that defines approximately two portions in the housing 1 in the axial direction, and the wrap 41 projects from the front and back plate surfaces to form the movable scroll 4 paired with the fixed scroll 3. Have been. The end plate 25 is composed of three large disk-shaped end plate members 5a, 5b, and 6,
The first end plate member 5a and the second end plate member 5b are each provided with the wrap 41 on the plate surface. The third end plate member 6 is sandwiched between the first and second end plate members 5a and 5b, and is integrated with the first and second end plate members 5a and 5b.

The first end plate member 5a has a central portion formed in a tubular shape, the shaft 21 is inserted therethrough, and is connected to the shaft 21 via a bearing 23c. The cylindrical portion 5 of the end plate member 5a is located at a position near both sides of the bearing 23c in the shaft 21 direction.
An annular oil seal 24c is provided between the shaft 1 and the shaft 21. Further, the second end plate member 5b and the third
The end plate member 6 has a hole at the center, and is fitted to and integrated with the first end plate member tubular portion 51. In this state, the opposing surfaces of the first end plate member 5a and the third end plate member 6,
The opposing surfaces of the second end plate member 5b and the third end plate member 6 are in close contact with each other.

The wrap 41 of the orbiting scroll 4 has a spiral shape whose radius of curvature becomes smaller toward the inner circumference, similarly to the wrap 31 of the fixed scroll 3, and is assembled so as to engage with the opposed fixed scroll wrap 31 respectively. I have. A crescent-shaped working chamber 104 is provided between the fixed scroll wrap 31 and the movable scroll wrap 41 which mesh with each other.
Is formed.

The shaft 21 has a third end plate member tubular portion 51.
Is eccentric with respect to the rotation center defined by the bearings 23a and 23b, and the orbiting scroll 4 revolves with the rotation of the shaft 21. The revolving motion of the orbiting scroll 4 is a translational motion while maintaining the posture by connecting the end plate 25 to a rotation preventing mechanism (not shown). The direction of the revolving motion will be described with reference to FIG. 2. The wraps 31 and 41 are wound leftward from the inner circumference to the outer circumference, and the revolving motion is clockwise.

At this time, the air taken in from the suction port 101 first flows between the outermost fixed scroll wrap 31 and the movable scroll wrap 41 (hereinafter referred to as a suction space), and the revolving angular position of the movable scroll 4 is changed. At a certain angle, a crescent-shaped working chamber 104 in which air is trapped is formed between the wraps 31 and 41. Then, as the orbital angle position of the orbiting scroll 4 advances, the working chamber 104 gradually moves toward the inner peripheral side where the radii of curvature of the wraps 31 and 41 are small, whereby the air in the working chamber 104 is compressed and finally. It is discharged from the discharge port 102. At this time, a large amount of heat is generated by the adiabatic compression, and the wraps 31, 41 are heated.

The first and second end plate members 5a and 5b are respectively provided with wraps 31 and 4 on the surfaces facing the third end plate member 6.
A deep groove 501 is formed along the spiral of FIG.
01 is covered by the third end plate member 6, and a spiral cavity 401 is formed in each of the movable scroll wraps 41. Further, a communication hole 402 communicating with the cavity 401 is formed in the wrap 41 at a position substantially at the end of winding on the outer peripheral side, and is opened on the inner peripheral side surface of the wrap 41 facing the wrap 31.

The opening position of the communication hole 402 is set as follows. That is, when the rotation of the movable scroll 4 reaches a predetermined angle, the fixed scroll wrap 31 and the movable scroll wrap 41 abut at two places, and the closed working chamber 1 is closed.
04 is formed. Then, as the contact portion moves to the inner peripheral side where the radius of curvature of the wraps 31 and 41 is small with the rotation of the orbiting scroll 4, the working chamber 104 contracts. That is, the opening position of the communication hole 402 is within the contact position P1 on the outer peripheral side of the fixed scroll wrap 31 and the movable scroll wrap 41 when the working chamber 104 is closed, that is, when the working chamber 104 starts reducing. On the circumferential side, when the movable scroll 4 is rotated by a predetermined angle, the movable scroll 4 is set so as to be more outer than the contact position moved during that time. That is, the working chamber 104 and the communication hole 102 are set to communicate with each other in the initial stage of the compression of the working chamber 104.

On the other hand, as shown in FIG. 3, the third end plate member 6 has a first linear hole 40 extending from the side surface toward the center.
3a are formed. In addition, the first hole 403 is penetrated in the plate thickness direction at an end position on the center side of the hole 403a.
a of the second hole 403b forming the communication flow path 403
Is formed.

The second hole 403b opens on the front and back surfaces of the third end plate member 6 and is formed at a position facing the inner peripheral end of the groove 501 formed in the movable scroll 4. The communication channel 403 is set so that the communication between the communication channel 403 and the cavity 401 inside the both movable scroll wraps 41 is always established.

On the other hand, the first hole 40 on the side surface of the end plate 6
The opening position of the first hole 4a is set at least when the communication hole 402 of the wrap 41 communicates with the working chamber 104.
03a and the suction space 103 are set so as to communicate with each other.

The operation of the scroll compressor will be described. When the movable scroll 4 revolves and the working chamber 104 is formed, the cavity 401 of the movable scroll wrap 41 communicates with the working chamber 104 at the outer peripheral end and communicates with the suction space 103 at the inner peripheral end. Thereby, the heat in the cavity 401 is efficiently discharged to the outside of the orbiting scroll 4.

In this embodiment, the movable scroll 4
When the working chamber 104 contracts with the rotation of the
4 is pushed out and passes through the communication hole 402 to form the cavity 4.
01, and reaches the inner peripheral end of the cavity 401, it further flows into the suction space 104 through the communication channel 403. Air received from the orbiting scroll 4 in the cavity 401 is forcibly discharged to the outside of the orbiting scroll 4, so that the orbiting scroll wrap 41 can be cooled more efficiently.

It is also possible to form a cavity inside the fixed scroll wrap 31 so that the cavity communicates with the working chamber and the suction space. In this case, if the structure of the present embodiment in which the cavity 401 inside the movable scroll wrap 41 communicates with the working chamber 104 and the suction space 103 is provided as it is, the wrap cooling effect can be further enhanced.

Further, a plurality of working chambers formed between the fixed scroll 3 and the movable scroll 4 may be provided with cavities, communication holes and communication passages in one-to-one correspondence.

(Second Embodiment) FIG. 4 shows a scroll compressor according to a second embodiment of the present invention. The fixed scroll and the movable scroll are a single unit, and another means is used for cooling the movable scroll wrap. In the figure, portions denoted by the same reference numerals as those in the first embodiment perform substantially the same operations as those in the first embodiment, and therefore, a description will be made focusing on differences from the first embodiment.

The fixed scroll 3A has a wrap 31 protruding from an end wall 12c of the housing 1A as an end plate.

The movable scroll 4A has an end plate 25A in which the end plate members 5A and 6A are in close contact with each other, a wrap 41 protrudes from the plate surface of the first end plate member 5A, and a second end plate member 6A. Has a tubular portion 61 at the center. The cylindrical portion 61 is coupled to the eccentric shaft end of the shaft 21 via a bearing 23c, and the movable scroll 4A revolves with the rotation of the shaft 21.

Behind the end plate 25A of the orbiting scroll 4A, a gap is provided between the end plate 25A and the housing 1A. A suction port 101 provided in the peripheral wall 11A of the housing 1A leads to a suction space 103 in the housing 1A. Is taken into the working chamber 104, and a part of the air wraps around the end plate 25A.

The movable scroll wrap 41 is substantially the same as that of the first embodiment except that a communication hole is not formed, and a cavity 401 is formed.

Further, through holes 601 and 602 are formed in the end plate member 6A at the end positions of the cavity 401 formed in close contact with the end plate member 5A, respectively.
The 5A rear space 105 is in communication.

According to the scroll type compressor, since the cavity 401 inside the movable scroll 4A communicates with the suction space 103 via the end plate rear space 105, the heat of the cavity 401 is relatively low. 4 and the movable scroll wrap 401 is cooled. In addition, since the orbiting scroll 4A revolves, the suction space 10
3 changes periodically. And the suction space 103
Is present in the suction space 103
Pressure distribution fluctuates. As a result, a differential pressure is generated between both ends of the cavity 401, and an air flow is formed in the cavity 401. Thereby, the cooling efficiency is further improved.

It is also possible to form a cavity inside the fixed scroll so that the cavity communicates with the suction space. In this case, if the structure of the first embodiment or the present embodiment for cooling the movable scroll wrap is provided as it is, the scroll cooling effect can be further enhanced.

(Third Embodiment) FIG. 5 shows a scroll type compressor according to a third embodiment of the present invention. In the second embodiment, the fixed scroll is cooled instead of the movable scroll, and the cooling means is replaced with another structure. In the figure, portions denoted by the same reference numerals as those in the second embodiment operate in the same manner as those in the second embodiment, and therefore, a description will be given focusing on differences from the second embodiment.

The housing 1B has substantially the same structure as that of the second embodiment, and has an end wall 12d on the discharge port 102 side.
Are different from each other in that the inner end wall portion 121 on which the wrap 31B is provided and an outer end wall portion 122 separate from the inner end wall portion 121 are provided. On the surface of the inner end wall 121 facing the outer end wall 122, a deep groove 1211 is formed along the spiral of the wrap 31B and reaches near the tip of the wrap 31B as in the first and second embodiments. Wall 12
2 is fixed to the inner end wall 121 to form the cavity 301.

On the other hand, the cooling water ports 106 which penetrate the outer end wall portion 122 in the thickness direction of the end wall portion 122 and are opened at the outer peripheral end position and the inner peripheral end position of the cavity 301, respectively. , 107 are formed, a cooling water port 106 serving as a supply port, and a cooling water port 10 serving as a recovery port.
7, cooling water flows through both cooling water ports 106 and 107.
Is connected. Cooling water piping 7
In the middle of 1, a pump 72 as a heat transport fluid supply means, which is a low temperature part, and a heat exchanger 73 such as a radiator are provided, and heat is transported between the cooling water pipe 71 and the cavity 301 of the fixed scroll wrap 31B. The cooling water, which is a fluid, is circulated. Thus, the fixed scroll wrap 31B exchanges heat with the circulating cooling water to be cooled.

It should be noted that air or another heat transport fluid can be used instead of the cooling water. It is preferable to select an appropriate one according to the field to which the scroll compressor is applied.

The configuration of the present embodiment may be combined with a configuration for cooling the first and second movable scrolls.
Further, the cooling effect of the scroll can be enhanced.

Although the present invention has been described on the assumption that the fluid to be compressed is air, the present invention can be suitably applied to fluids such as gases other than air.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first scroll type compressor to which the present invention is applied.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an end plate of the scroll compressor.
FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view of a second scroll type compressor to which the present invention is applied.

FIG. 5 is a sectional view of a third scroll compressor to which the present invention is applied.

[Explanation of symbols]

 1, 1A, 1B Housing 101 Suction port 102 Discharge port 103 Suction space (low temperature section) 104 Working chamber 106, 107 Cooling water port 21 Shaft 22 Pulley 23a, 23b, 23c Bearing 24a, 24b, 24c Oil seal 25, 25A, 25B End plate 3, 3A, 3B Fixed scroll 31, 31A, 31B Wrap 4, 4A Movable scroll 41, 41A Wrap 401 Cavity 402 Communication hole 403 Communication flow path 404 Communication hole 601, 602 Through hole 71 Cooling water pipe 72 Pump (low temperature section) , Heat transport fluid supply means) 73 heat exchanger (low temperature section, heat transport fluid supply means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuo Inagaki 14 Iwatani, Shimowakaku-cho, Nishio-shi, Aichi Japan Inside the Japan Automotive Parts Research Institute (72) Inventor Hiroshi Okada 1-1-1 Showa-cho, Kariya-shi, Aichi Share F term in company DENSO (reference) 3H029 AA02 AA17 AB02 BB12 CC04 CC05 CC22 CC24 CC46 CC47 CC48 3H039 AA02 AA12 AA14 BB13 CC01 CC02 CC03 CC05 CC08 CC26 CC28 CC47 CC49 CC50

Claims (4)

[Claims] 1. A movable scroll having a spiral wrap formed on a plate surface of an orbiting end plate is provided in a cylindrical housing into which a fluid to be compressed is sucked, and is integrated with the housing. And a fixed scroll formed by forming a spiral wrap on the plate surface of the end plate opposed to the movable scroll so that the movable scroll and the wrap engage with each other, between the movable scroll wrap and the fixed scroll wrap. A scroll type compressor that compresses a fluid to be compressed in the working chamber by reducing a crescent-shaped working chamber formed along with the revolving motion, wherein a cavity extending in a spiral direction of the wrap inside the wrap of the scroll. Wherein the cavity is communicated with a low-temperature part. 2. The scroll type compressor according to claim 1, wherein the wrap formed with the cavity has an opening on a surface facing another wrap which engages with the wrap, and communicates with an outer peripheral end of the cavity. Forming a communication passage in the end plate, the end plate being on the inner peripheral side of the cavity and a suction space communicating with the suction port of the fluid to be compressed on the outer periphery of the working chamber. And, the opening position of the communication hole is set so that the communication hole communicates with the working chamber for a certain period of time when the working chamber starts reducing, and the scroll-type compression in which the low-temperature part is the suction space. Machine. 3. The scroll-type compressor according to claim 1, wherein one end of the cavity and a suction space communicating with a suction port of the fluid to be compressed on an outer periphery of the working chamber are provided on an end plate of the scroll. And a second communication flow path that communicates the other end of the cavity with the suction space, wherein the low-temperature portion is the suction space. Compressor. 4. The scroll-type compressor according to claim 1, wherein said cavity is formed inside a wrap of said fixed scroll, and said housing is connected to one end of said cavity, and heat transfer fluid is supplied from outside. Forming a supply port to be supplied and a recovery port through which the heat transport fluid returns to the cavity through the other end of the cavity, wherein the low temperature section supplies the heat transport fluid to the supply port; A scroll compressor as a fluid supply means.