JPH0932761A - Scroll-type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve heat radiating property of a back surface side of a turning scroll and a turning bearing, to improve cooling efficiency, and also to miniaturize the whole device. SOLUTION: Respective radial heat radiating fins 11 are provided on the back surface side of an end plate 7A of a turning scroll main body 7, and a plate-like cover 12 is integrally provided on the turning scroll main body 7 through respective heat radiating fins 11. Respective cooling air passage 14 are partitioned between the back surface side of the turning scroll main body 7 and the plate-like cover 12 through respective heat radiating fins 11, and respective vent holes 12C are provided on the plate-like cover 12 so as to opened to the insides of respective cooling air passages 14. Therefore, cooling air is allowed to flow into respective air passages 14 by the turning movement of a turning scroll 6, and the cooling air is partially all-owed to flow to and from a boss part 12B side through respective vent holes 12C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine suitable for use in, for example, an air compressor or a vacuum pump, and more particularly to an air cooling type scroll fluid machine.

[0002]

2. Description of the Related Art Generally, a casing, a fixed scroll integrally provided on the casing, a drive shaft having a base end side rotatably supported by the casing and a tip end serving as a crank, and a crank of the drive shaft. A scroll-type fluid machine is known which includes a swivel scroll that is orbitably provided and that defines a plurality of compression chambers between the fixed scroll and the fixed scroll.

When this type of scroll type fluid machine is used as an air compressor, the orbiting scroll is orbited by rotating the drive shaft from the outside by an electric motor or the like, and the orbiting scroll is rotated between the orbiting scroll and the fixed scroll. While compressing the air sucked from the outside in the plurality of compression chambers formed in, the compressed air is discharged from the discharge port toward the external air tank or the like.

Here, in the scroll type air compressor according to the prior art, compression heat is generated in each compression chamber during the compression operation, and the wrap portion of the fixed scroll or the wrap portion of the orbiting scroll is distorted due to thermal expansion or temperature non-uniformity. There is a problem that deformation occurs and this compression heat is transmitted to the slewing bearing and the like, and the slewing bearing generates heat due to friction during rotation, and grease and the like in the slewing bearing leaks to damage the slewing bearing. .
Then, in order to solve such a problem, what took the following means is known.

First, in the first prior art, the actual fairness 3-6
As shown in Japanese Patent Publication No. 880, a drive shaft is provided with a centrifugal fan located on the orbiting scroll side and a multi-blade fan located outside the casing, and each fan is rotationally driven by using the driving force of the drive shaft. Thus, the cooling air generated at this time is circulated to the back side of the orbiting scroll or the boss portion of the orbiting scroll to cool them.

Further, in the second prior art, the actual exploitation 64-64
As shown in Japanese Patent Publication No. 51789, a centrifugal fan is provided on the drive shaft outside the casing, and a blower duct that connects the centrifugal fan side and the orbiting scroll back side is provided outside the casing. By rotationally driving by using the driving force of the drive shaft, the cooling air generated at this time is circulated to the back side of the orbiting scroll or the boss portion of the orbiting scroll through the air duct to cool them. ing.

[0007]

By the way, in the above-mentioned first prior art, since the multi-blade fan and the centrifugal fan are provided, the entire apparatus becomes large and complicated, and two fans are required. In order to drive the rotation, a driving source having a large driving force is required, and there is a problem that manufacturing cost and running cost increase.

Further, in the second prior art, since the blower duct is provided for circulating the cooling air from the centrifugal fan to the side of the orbiting scroll, the entire apparatus is large in size as in the first prior art. In addition to being complicated and complicated, there is a problem that a driving source having a large driving force is required to compensate for the pressure loss of the cooling air flowing in the air duct, resulting in high manufacturing cost and running cost.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention improves the cooling efficiency by improving the heat dissipation of the back side of the orbiting scroll and the orbiting bearing, and reduces the size of the entire apparatus. It is an object of the present invention to provide a scroll type fluid machine in which the manufacturing cost, running cost, etc. can be significantly reduced.

[0010]

In order to solve the above-mentioned problems, a scroll type fluid machine according to the present invention comprises a casing, a fixed scroll integrally provided on the casing, and a base end side of which rotates on the casing. A structure comprising a drive shaft which is supported so as to be a crank and whose front end side is a crank, and an orbiting scroll which is provided on the crank of the drive shaft so as to orbit and which defines a plurality of compression chambers between the fixed scroll and There is.

The features of the configuration adopted by the present invention are as follows:
The orbiting scroll has a orbiting scroll main body in which a spiral wrap portion is erected on the front surface side and a plurality of heat radiation fins is provided on the rear surface side, and a plurality of cooling is provided on the back side of the orbiting scroll body via each heat radiation fin. The plate-shaped cover is provided on the back side of the orbiting scroll main body so as to form a wind passage, and has a boss portion that is rotatably provided on the crank of the drive shaft. A plurality of ventilation holes, which are located radially outside the boss portion and communicate with the cooling air passage, are formed.

[0012]

With the above-mentioned structure, since the heat dissipating fins provided on the back side of the orbiting scroll body perform the orbiting motion together with the orbiting scroll, the air in the cooling air passage is swirled along with the orbiting motion. The outside air flows in and out of the cooling air passage as cooling air. And
A part of the cooling air flowing through the cooling air passage is also circulated to the boss side through the ventilation hole.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, an air-cooled scroll air compressor will be described as an example of the scroll fluid machine.

First, a first embodiment of the present invention will be described with reference to FIGS.

In the figure, reference numeral 1 denotes a stepped cylindrical casing which constitutes the main body of the scroll type air compressor, and the casing 1 is a bearing portion 1A formed in a small diameter cylindrical shape.
An annular flange portion 1B extending radially outward from the base end side of the bearing portion 1A, a tubular large diameter portion 1C axially protruding from the outer peripheral side of the flange portion 1B, Large diameter part 1
It is roughly composed of an annular abutting portion 1D integrally formed at the tip of C.

Here, a plurality of vent holes 1E, 1E, ... (Only two are shown) are bored in the large-diameter portion 1C of the casing 1 so as to surround a radiation fin 11 and a cooling air passage 14 which will be described later. The respective vent holes 1E allow the outside air (cooling air) to flow into the cooling air passage 14.

Reference numeral 2 denotes a fixed scroll integrally provided on the tip end side of the casing 1. The fixed scroll 2 and a substantially disk-shaped end plate 2A arranged so as to coincide with the axis of a drive shaft 3 described later. A mounting flange portion 2B protruding from the outer edge side of the end plate 2A and having an outer peripheral side fixed to the abutting portion 1D of the casing 1 via a bolt or the like, and an axially erected state from the front surface side of the end plate 2A and the center side being wound. It is roughly composed of a spiral wrap portion 2C having a starting end and an outer peripheral end being a winding end, and a large number of heat radiation fins 2D, 2D, ... Standing in parallel on the back surface side of the end plate 2A.

Reference numeral 3 denotes a drive shaft rotatably supported by a bearing portion 1A of the casing 1 via a bearing 4, and the drive shaft 3
The front end side of the crank extends to the inside of the casing 1 to form the crank 3A, and the axis of the crank 3A is eccentric to the axis of the drive shaft 3 by a predetermined dimension. The drive shaft 3 is connected to a drive source (not shown) on the base end side protruding outside the casing 1, and is rotationally driven by the drive source, whereby the crank 3
The orbiting scroll 6, which will be described later, is orbitally moved via A.

Reference numeral 5 denotes a balance weight, which is fixed to the base end side of the crank 3A and balances the rotation of the drive shaft 3 with respect to the orbiting motion of the orbiting scroll 6.

Reference numeral 6 denotes an orbiting scroll which is disposed so as to be able to orbit in the casing 1 so as to face the fixed scroll 2. The orbiting scroll 6 is provided on an orbiting scroll body 7 and a back side of the orbiting scroll body 7 which will be described later. It is configured integrally with the attached plate-like cover 12.

Reference numeral 7 denotes an orbiting scroll main body. The orbiting scroll main body 7 is provided with a disk-shaped end plate 7A and is erected on the surface of the end plate 7A. The spiral wrap portion 7B, which is the end of the winding, and the radiation fins 11, which will be described later, are provided upright on the back side of the end plate 7A. Then, during operation of the scroll air compressor, air is sucked into the compression chamber 8 on the outer peripheral side from the suction port 9 provided on the outer peripheral side of the fixed scroll 2 while the orbiting scroll 6 makes orbital movement of the air. The compressed air is sequentially compressed in the compression chamber 8, and finally compressed air is discharged from the compression chamber 8 on the center side to the outside from a discharge port 10 provided at the center of the fixed scroll 2 through a discharge pipe 19 described later.

Reference numerals 11, 11, ... Depict heat radiating fins integrally formed on the rear side of the end plate 7A of the orbiting scroll body 7, and each radiating fin 11 has a substantially rectangular flat plate shape as shown in FIGS. They are formed and are erected so as to extend radially from the center side of the end plate 7A toward the outer side in the radial direction at intervals of an angle θ of, for example, about 45 degrees. The heat radiation fins 11 increase the heat radiation area on the rear side of the end plate 7A, so that the compression heat generated during the operation of the scroll type air compressor is transferred from the rear side of the end plate 7A to the cooling air passages 1 to be described later.
Heat is efficiently dissipated to the 4 side.

Further, in the orbiting scroll main body 7, the plate-like cover 12 is arranged so that the reference line L-L of each heat radiation fin 11 shown in FIG. 2 coincides with the alignment line N-N shown in FIG.
Have been polymerized against.

Reference numeral 12 denotes a plate-like cover provided on the back side of the orbiting scroll body 7, and the plate-like cover 12 is shown in FIG.
As shown in FIG. 7, the cover body 12A is formed in a stepped disc shape having substantially the same diameter as the end plate 7A of the orbiting scroll body 7, and the boss portion 12B is formed at the central portion of the cover body 12A so as to project in the axial direction. And vent holes 12C, 12C, ... Of substantially oval shape, which are located outside the boss portion 12B in the radial direction and are formed to extend radially in the cover body 12A, and on both left and right sides of the boss portion 12B. It is roughly composed of two elongated X-axis key grooves 12D, 12D that are positioned and formed in the cover body 12A.

Then, the cover body 12 of the plate-like cover 12
A is integrally attached to the orbiting scroll main body 7 via a bolt (not shown) or the like so as to come into contact with the tip end surface of each heat radiation fin 11, and is provided between the orbiting scroll main body 7 and the rear side of the end plate 7A. Each cooling air passage 14 through the radiation fins 11
Is defined. The boss portion 12B of the plate-like cover 12 (orbiting scroll 6) is rotatably attached to the crank 3A of the drive shaft 3 via the orbiting bearing 13.

Here, each vent hole 1 of the plate-like cover 12
The 2C and the X-axis key groove 12D are radially oriented radially outward from the outer peripheral side of the boss portion 12B at an interval of an angle θ similarly to the heat dissipating fins 11. Then, the plate-shaped cover 12 forms the alignment line N-N inclined by an angle (θ / 2) with respect to the reference line M-M of each ventilation hole 12C shown in FIG. Integrated with the orbiting scroll body 7 so as to match −L,
As a result, each ventilation hole 12C is connected to each cooling air passage 1 described later.
4, and the cooling air passages 14 are communicated with the boss 12B side.

The plate-like cover 12 is composed of the cover body 12
The outer peripheral side of A becomes an annular sliding surface 12E, and the sliding surface 12E
E slides on a sliding surface 15C of a thrust receiving plate 15 described later, and each key portion 16 of an Oldham ring 16 described later.
B or the like is slidably displaced along each X-axis key groove 12D of the plate-like cover 12 and each Y-axis key groove 15D of the thrust receiving plate 15, so that the orbiting scroll 6 has a circle with a predetermined radius. I am trying to give a movement (turning movement).

, 14, between the end plate 7A of the orbiting scroll main body 7 and the plate-like cover 12, each heat radiation fin 11 is provided.
Shows a cooling air passage formed as a substantially fan-shaped passage portion.
.., and when the orbiting scroll 6 orbits, the cooling fins 11 generate cooling air by agitating the air on the side of each expanding portion 14A or the like. That is, when the orbiting scroll 6 orbits, the heat dissipating fins 11 make orbiting movements and the cooling air passages 14
An air flow (cooling wind) is generated due to a change in air pressure inside, and outside air flows in the direction of arrow A from each vent 1E of the casing 1 toward each expanded portion 14A side of each cooling air passage 14. A part of the cooling air is discharged from the other vent 1E in the direction of arrow B. In addition, a part of the cooling air (air) at this time flows out and enters in the directions C and D indicated by the arrows through the ventilation holes 12C of the plate-like cover 12 and enters the boss portion 12B (thrust receiving plate 15). Circulate cooling air.

Reference numeral 15 denotes a thrust receiving plate provided on the large diameter portion 1C side of the casing 1. The thrust receiving plate 15 is a short cylindrical thrust receiving member whose outer peripheral side is fixed to the inner peripheral surface of the casing 1 by welding or the like. Portion 15A and the thrust receiving portion 1
5A, which is formed from a disk-shaped guide portion 15B which projects radially inward from the inner peripheral surface of 5A and has a through hole 15B1 formed therein.

Here, in the thrust receiving portion 15A of the thrust receiving plate 15, the end surface on the side of the orbiting scroll 6 is the plate-shaped cover 12.
Of the plate-shaped cover 12 through the sliding surface 12E of the plate-shaped cover 12 and the sliding surface 15C against the sliding surface 12E of the plate-shaped cover 12. ing. Further, the guide portion 15B has a through hole 15
Two Y-axis key grooves 15D, 15D are formed on the B1 side, and each Y-axis key portion 16B of the Oldham ring 16 is along each Y-axis key groove 15D along the Y-axis direction shown in FIG. It is designed to slide.

Reference numeral 16 is a plate-like cover 12 and a thrust receiving plate 15.
An Oldham ring disposed between the ring section 16A and the annular ring section 16A.
Two X-axis key portions (not shown) projectingly formed on the end face of the plate-shaped cover 12 on the side of A corresponding to the respective X-axis key grooves 12D and the end face of the ring portion 16A on the thrust receiving plate 15 side. 2 formed to project at a position corresponding to the Y-axis key groove 15D
It is formed of individual Y-axis key portions 16B and 16B.

In the Oldham ring 16, each key portion 16B and the like has an X-axis key groove 12D and a Y-axis key groove 15 respectively.
The sliding direction is regulated by sliding displacement along the D-axis in the X-axis and Y-axis directions shown in FIG. 3, whereby the orbiting scroll 6 is prevented from rotating, and the orbiting scroll 6 is provided with an orbiting radius of a predetermined dimension. It gives a circular motion (turning motion).

Reference numeral 17 denotes each radiation fin 2 of the fixed scroll 2.
D shows a cover plate fixed to the front end surface, and the cover plate 17
Is the end plate 2 of the fixed scroll 2 through each heat radiation fin 2D.
By defining a plurality of cooling air passages 18, 18, ... Between the rear surface of A and the cooling air passages from the outside in each cooling air passage 18, high temperature generated in each compression chamber 8 The compression heat and the like can be efficiently radiated to the outside through each radiation fin 2D. Further, a through hole 17B is formed in the center of the cover plate 17, one end side of the projecting pipe 19 is connected to the discharge port 10, and the other end side is opened to the outside through the through hole 17B.

The scroll type air compressor according to the present embodiment has the above-mentioned structure, and its compressing operation will be described below.

First, the drive shaft 3 is rotated by the drive source,
When the orbiting scroll 6 is orbited, the compression chambers 8, 8, ... Defined between the wrap portion 2C of the fixed scroll 2 and the wrap portion 7B of the orbiting scroll body 7 are continuously reduced. Thereby, while the outside air sucked from the suction port 9 of the fixed scroll 2 is sequentially compressed in each compression chamber 8, this compressed air is discharged from the discharge port 10 of the fixed scroll 2 to the external air tank or the like via the discharge pipe 19. Discharge.

Next, in order to explain the cooling action of the scroll type air compressor, when the drive shaft 3 is rotationally driven by the drive source, each radiating fin 11 makes an orbiting motion with the orbiting motion of the orbiting scroll 6, The air in each cooling air passage 14 is stirred. As a result, an air flow (cooling wind) is generated in each cooling air passage 14 due to the pressure fluctuation of the air pressure, and the outside air flows from each ventilation port 1E toward each expansion portion 14A in the direction of arrow A, and Cooling air is discharged from the other vent 1E in the direction of arrow B. By utilizing the orbiting motion of the orbiting scroll 6 to circulate the cooling air in each cooling air passage 14, high-temperature compression heat and the like generated in each compression chamber 8 at the time of compression operation can be applied to each radiating fin. It is possible to efficiently radiate heat from the cooling air passage 14 side to the outside of the casing 1 via 11.

Here, the plate-like cover 12 has each ventilation hole 12
Since C is provided, part of the cooling air flowing in each cooling air passage 14 also flows out to the boss portion 12B (thrust receiving plate 15) side through each ventilation hole 12C as indicated by arrows C and D. , So that high-temperature frictional heat generated between the crank 3A of the drive shaft 3 and the slewing bearing 13 during operation, frictional heat associated with the sliding movement of the Oldham ring 16 and the like can be efficiently cooled. It is possible to effectively improve the cooling efficiency of the entire apparatus.

Thus, according to this embodiment, the radial radiation fins 1 are provided on the rear side of the end plate 7A of the orbiting scroll body 7.
1 is provided upright and the plate-shaped cover 12 is integrally provided on the orbiting scroll main body 7 through the respective radiation fins 11,
Each cooling air passage 14 is defined between the orbiting scroll body 7 and the end plate 7A, and the plate-like cover 12 has a boss portion 12
Since the ventilation holes 12C are formed so as to be located on the outer peripheral side of the B and open into the cooling air passages 14, the following operational effects are achieved.

That is, by utilizing the orbiting motion of the orbiting scroll 6, the outside air is used as cooling air and each cooling air passage 14 is used.
In addition to being able to be circulated inside, a part of this cooling air can also flow into and out of the boss portion 12B side through each ventilation hole 12C, and is generated in each compression chamber 8 during operation of the scroll air compressor. It is possible to effectively cool high-temperature compression heat, high-temperature friction heat generated in the boss portion 12B when the drive shaft 3 is rotationally driven, and the lap portions 2C and 7B.
It is possible to prevent thermal deformation of the above, and to prevent grease or the like that lubricates the slewing bearing 13 from leaking into the boss portion 12B, and it is possible to greatly improve the durability and life of the device.

Therefore, according to this embodiment, in order to blow the cooling air into the casing 1 or the like to cool the apparatus, the drive shaft 3
Since a centrifugal fan and a large drive source mounted on the machine are unnecessary, the entire device can be effectively miniaturized, the mechanism of the device can be simplified, and the manufacturing cost and running cost can be surely reduced. it can.

Next, a second embodiment of the present invention will be described with reference to FIGS. 4 and 5. The feature of this embodiment is that a plurality of heat radiation fins are arranged in parallel with each other on the back side of the end plate of the orbiting scroll body. And a plurality of parallel cooling air passages are formed between the plate-shaped cover and the rear side of the end plate through the radiation fins, and the plate-shaped cover is opened in the cooling air passages. That is, a plurality of ventilation holes are formed. In this embodiment, the same components as those of the scroll type air compressor according to the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

Reference numerals 21, 21, ... Denote a plurality of heat dissipating fins provided on the rear side of the end plate 7A of the orbiting scroll body 7,
Although each radiating fin 21 is formed of a substantially rectangular plate material like each radiating fin 11 shown in the first embodiment, each radiating fin 21 is left and right as shown in FIG. The radiating fins 21 are erected parallel to each other and spaced apart at equal intervals, and the length of the radiating fins 21 located in the central portion is gradually reduced toward the upper and lower sides.

Further, the orbiting scroll body 7 has a plate-like cover 22 which will be described later so that the reference line WW of each radiating fin 21 shown in FIG. 4 coincides with the alignment line XX shown in FIG. It has been polymerized.

Reference numeral 22 denotes a plate-like cover provided on the side of the orbiting scroll body 7, and the plate-like cover 22 is substantially the same as the plate-like cover 12 described in the first embodiment, and the cover body 22A and the boss portion. 22B, each X-axis keyway 22D, sliding surface 2
2E, the cover body 22A has four ventilation holes 22C1, 22C1, ..., 2 which are parallel to each other and spaced at equal intervals with each X-axis key groove 22D interposed therebetween.
Ventilation holes 22C2, 22C2 and two ventilation holes 22
C3 and 22C3 are drilled. The plate-shaped cover 22 is fixed to the orbiting scroll main body 7 so as to abut the tip end surface of each cooling fin 21, and a cooling air passage as a horizontally long passage parallel to the back side of the orbiting scroll main body 7. 23, 23, ... are defined.

As shown in FIG. 5, each vent hole 22C1 is formed in a short, substantially oval shape, is located on both the left and right sides of the boss portion 22B, and is located above the X-axis key groove 22D. ， It is formed parallel to each other on both lower sides. Further, on each of the upper and lower sides of each ventilation hole 22C1, there is formed a substantially oblong ventilation hole 22C2 extending in the lateral direction.
Vent holes 22C3 having substantially the same shape as those of the vent holes 22C2 are formed on both upper and lower sides of 2, respectively.

The plate-shaped cover 22 is arranged so that the alignment line XX of each X-axis key groove 22D is aligned with each radiating fin 21.
Is integrated with the orbiting scroll main body 7 so as to coincide with the reference line WW of the ventilation holes 22C1.
22C3 is opened in each cooling air passage 23.

Thus, also in the present embodiment having such a configuration, the air in each cooling air passage 23 is stirred by each radiation fin 21 in accordance with the orbiting motion of the orbiting scroll 6, and thereby the cooling air is provided to each one. It can be circulated in the cooling air passage 23, and can also flow out and enter into the boss portion 22B side through the communication holes 22C1 to 22C3.
The same operation and effect as those of the embodiment can be obtained.

In each of the above-mentioned embodiments, each ventilation hole 1E is provided in the large diameter portion 1C of the casing 1 so that the cooling air can be circulated in each cooling air passage 14, 23 through each ventilation hole 1E. However, on the flange portion 1B side of the casing 1, as shown by the phantom line in FIG.
1, ... (only two are shown) may be provided, whereby cooling air can be efficiently blown to the boss portion 12B (22B) side through each ventilation port 31, and the boss portion 12B (2B)
2B), the cooling efficiency of the slewing bearing 13, the Oldham ring 16 and the like can be further enhanced.

In the first embodiment, the plate cover 12 is swung so that the alignment line N-N of the plate cover 12 and the reference line L-L of each radiating fin 11 coincide with each other. Although it has been described as being integrated with the scroll body 7, the present invention is not limited to this. For example, even if the reference line LL of each radiating fin 11 and the alignment line MM of the plate-shaped cover 12 are made to coincide with each other. Well, in this case, each radiation fin 11
It is sufficient to form a gap for allowing cooling air to flow between each radiating fin 11 and each vent hole 12C by forming the width dimension of each vent hole smaller than the width dimension of each vent hole 12C.

Similarly, in the second embodiment, the plate-like cover 22 is aligned by aligning the alignment line XX of the plate-like cover 22 with the reference line WW of each radiating fin 21. Although the cover 22 is described as being integrated with the orbiting scroll main body 7, the width dimension of each radiation fin 21 is made smaller than the width dimension of each communication hole 22C1 to 22C3, and each radiation fin 21 is connected to each communication hole 22C1. It may be provided upright at a position corresponding to .about.22C3.

Further, in the first embodiment, the heat radiation fins 11 are arranged radially, and in the second embodiment, the respective heat radiation fins 21 are erected parallel to each other along the left and right directions. However, the present invention is not limited to this, and for example, heat radiation fins may be erected parallel to each other along the upper, lower, or diagonal directions on the rear surface side of the end plate 7A of the orbiting scroll body 7.

Furthermore, in each of the above-mentioned embodiments, the scroll type air compressor has been described as an example, but the present invention is not limited to this, and can be applied to a compressor for compressing a gas other than air,
It can also be applied to a vacuum pump or the like.

[0053]

As described above in detail, according to the present invention, a plurality of heat dissipating fins are provided on the rear side of the end plate of the orbiting scroll body, and a plate-shaped cover is integrally provided on the orbiting scroll body via the heat dissipating fins. A plurality of cooling air passages are defined between the plate-shaped cover and the back side of the orbiting scroll body via the radiation fins, and the plate-shaped cover is positioned on the outer side in the radial direction of the boss portion. Since a plurality of ventilation holes communicating with the cooling air passage are formed, the cooling air can be circulated in each cooling air passage by utilizing the orbiting motion of the orbiting scroll, and the high temperature generated in each compression chamber during operation. The compression heat of can be efficiently radiated through the cooling fins in the cooling air passage, and part of this cooling air can also flow into and out of the boss through the ventilation holes. Boss by rotation drive Friction heat, etc. of high temperature caused by the inner can be effectively cooled, it is possible to greatly improve the durability and life of the device.

Therefore, since the cooling air is blown into the casing or the like to cool the apparatus, a centrifugal fan or the like mounted on the drive shaft or a large drive source is unnecessary, and the entire apparatus can be effectively miniaturized. At the same time, the mechanism of the device can be simplified, and the manufacturing cost, running cost, etc. can be surely reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a scroll type air compressor according to a first embodiment of the present invention.

FIG. 2 is an external view showing an end plate and a heat radiating fin of the orbiting scroll body as seen from the direction of arrows II-II in FIG.

FIG. 3 is a cross-sectional view showing a plate-like cover as seen from the direction of arrows III-III in FIG.

FIG. 4 is an external view similar to FIG. 2, showing radiation fins and the like of a scroll air compressor according to a second embodiment of the present invention.

FIG. 5 is a sectional view similar to FIG. 3, showing a plate-shaped cover of a scroll air compressor according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Casing 1E, 31 Vent 2 Fixed scroll 2A End plate 2C Wrap part 3 Drive shaft 3A Crank 6 Orbiting scroll 7 Orbiting scroll body 7A End plate 7B Wrap part 8 Compression chamber 11,21 Radiating fins 12,22 Plate cover 12B, 22B Boss Part 12C, 22C1, 22C2, 22C3 Vent hole 14,23 Cooling air passage 16 Oldham ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroyuki Mihara 1-6-3 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokiko Co., Ltd. (72) Kazutaka Suedo 1-6-3 Fujimi, Kawasaki-ku, Kanagawa Prefecture No. Tokiko Co., Ltd. (72) Inventor Shingo Miyake 1-3-6 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokiko Co., Ltd.

Claims (1)

[Claims] 1. A casing, a fixed scroll integrally provided in the casing, a drive shaft having a base end side rotatably supported by the casing and a tip end serving as a crank, and a crank of the drive shaft. In the scroll type fluid machine, which is provided with the fixed scroll and defines a plurality of compression chambers between the fixed scroll and the fixed scroll, the orbiting scroll has a plurality of spiral wraps erected on a front surface side and a plurality of back surface sides. Of the orbiting scroll body provided with the radiation fins, and the orbiting scroll body is provided on the back side of the orbiting scroll body so as to form a plurality of cooling air passages through the radiation fins on the back side of the orbiting scroll body. And a plate-shaped cover having a boss that is pivotally provided on the crank of the shaft, the plate-shaped cover being located radially outside the boss and being provided with the cooling member. A scroll-type fluid machine having a plurality of ventilation holes communicating with the air passage.