JPH0893674A - Scroll fluid machinery - Google Patents

Abstract

PURPOSE: To improve cooling efficiency of a turning bearing so as to improve durability of the turning bearing, etc. CONSTITUTION: A turning scroll 6 comprises a turning scroll main body 7 and a plate body 8 and a large-diameter boss part 8B for supporting a crank 3A of a drive shaft 3 via the turning bearing 13 and a small-diameter boss part for supporting an auxiliary crank via a bearing is provided in the rear side of the plate body 8. Cooling fins 10, 10 projecting radially as a whole are provided on respective outer circumference sides of the large-diameter boss part 8A and the small-diameter boss part. Such cooling fins 10, 10 are provided so that heat radiating performances of the large-diameter boss part 8a and the small-diameter boss part can be drastically improved. Therefore the large- diameter boss part 8A and the small-diameter boss part can be effectively cooled by cooling wind supplied in the casing main body 1A in such a way as shown by the arrow by a centrifugal fan 19 and a duct 21, and the turning bearing 13 and a bearing provided in the inside of the large-diameter boss part 8A and the small-diameter boss part respectively can be effectively cooled.

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-cooled scroll type fluid machine.

[0002]

2. Description of the Related Art Generally, a casing, a fixed scroll fixed to the casing and having a spiral wrap portion standing on an end plate, a base end side of which is rotatably supported by the casing, and a tip end side of which is located inside the casing. And a drive shaft that has become a crank, and a spiral wrap portion that is provided inside the casing and that overlaps the wrap portion of the fixed scroll on the front surface side of the end plate and a boss portion on the back surface A scroll-type fluid machine including a scroll and a orbiting bearing provided on a boss portion of the orbiting scroll for rotatably supporting the orbiting scroll on a crank of the drive shaft is known.

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, Japanese Patent Laid-Open No. 59-59
As shown in Japanese Patent No. 34494, it is known that a heat insulating material or a heat insulating space is provided between the orbiting scroll and the orbiting bearing to prevent the heat of compression generated in the compression chamber from being conducted to the orbiting bearing.

Further, in the second conventional technique, the actual construction of Sho 63-
As shown in Japanese Patent No. 184, a cooling air passage is formed in a casing, and cooling air is generated by a multi-blade fan and a centrifugal fan to cool an orbiting scroll, an orbiting bearing, and the like.

[0007]

By the way, in the above-mentioned first prior art, since the heat insulating material is provided between the orbiting scroll and the orbiting bearing, it is effective to transmit the compression heat to the orbiting bearing. Can be prevented. However, in the first prior art, since the cooling means for the slewing bearing is not provided, it is not possible to prevent the slewing bearing from self-heating due to friction during rotation and becoming high in temperature. Therefore, there is an unsolved problem that deterioration of the slewing bearing is accelerated and grease or the like in the slewing bearing may leak to damage the slewing bearing.

In the second conventional technique, cooling air is generated by the multi-blade fan and the centrifugal fan to cool the orbiting scroll, the orbiting bearing and the like. However, in the second conventional technique, since no means for cooling the fixed scroll is provided, the compression heat may be transferred to the fixed scroll, and the wrap portion of the fixed scroll may be thermally expanded or deformed. As a result, there is a problem in that the wrap portion of the fixed scroll comes into contact with the wrap portion of the orbiting scroll, hinders the orbiting motion of the orbiting scroll, and durability and reliability are significantly reduced.

Further, in the second prior art, since the multi-blade fan and the centrifugal fan are provided, the size of the entire apparatus is increased,
In addition to complicating, there is a problem that a driving source having a large driving force is required to rotate and drive the two fans, resulting in high manufacturing cost and running cost.

On the other hand, there is known an oil-free scroll type fluid machine in which an auxiliary crank is provided between the back surface of the orbiting scroll and the inner surface of the casing in order to prevent the orbiting scroll from rotating. There is. Boss portions are provided on the back surface of the orbiting scroll and the inner surface of the casing, and both ends of the auxiliary crank are supported by the boss portions. In addition, bearings are provided in the bosses so that the auxiliary cranks can rotate.

As described above, in the scroll type fluid machine having the auxiliary crank, each bearing rotatably supporting the auxiliary crank is deteriorated at an early stage due to self-heating during rotation and the durability and reliability are not necessarily improved. There is a problem that you cannot do it.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention improves the heat dissipation of the slewing bearing and improves the cooling efficiency, thereby extending the life of the slewing bearing and improving the durability, It is an object of the present invention to provide a scroll type fluid machine capable of significantly improving reliability.

[0013]

In order to solve the above-mentioned problems, a scroll type fluid machine according to the present invention comprises a casing and a fixed scroll fixed to the casing and provided with a spiral wrap portion standing on an end plate. And a drive shaft whose base end side is rotatably supported by the casing and whose front end side is located in the casing to form a crank, and which is provided in the casing and overlaps the wrap portion of the fixed scroll on the surface side of the end plate. An orbiting scroll in which a spiral wrap portion is provided upright and a boss portion is provided on the back side, and a boss portion of the orbiting scroll for rotatably supporting the orbiting scroll on the crank of the drive shaft are provided. A structure consisting of a slewing bearing is used.

The features of the configuration adopted by the present invention are as follows:
The casing is provided with a vent for allowing cooling air to flow inside and outside the casing, and a plurality of radially projecting bosses axially extending in a plate shape on the outer periphery of the boss of the orbiting scroll. There is a cooling fin.

[0015]

With the above structure, by providing a plurality of cooling fins projecting in the radial direction on the outer peripheral side of the boss and extending in a plate shape in the axial direction, the heat dissipation area of the boss can be increased and the heat dissipation of the boss can be improved. Can be improved. Accordingly, the boss portion can be efficiently cooled by the cooling air flowing in the casing through the ventilation hole provided in the casing, and the swivel bearing in the boss portion can be effectively cooled.

When the boss moves at high speed in the cooling air by the orbiting motion of the orbiting scroll, a plurality of axially extending cooling fins provided on the boss perform the orbiting motion to generate the cooling air. As a result, the heat dissipation of the boss portion is improved, and the slewing bearing provided in the boss portion can be effectively cooled.

[0017]

Embodiments 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 drawing, reference numeral 1 denotes a casing forming an outer frame of a scroll type air compressor.
Is a casing body 1A which is formed in a box shape from upper, lower, left and right side plates and a back plate, and has a front side opening, and a cylindrical bearing portion 1B projectingly formed on the rear side of the casing body 1A.
And a flange portion 1C integrally formed on the front side of the casing body 1A. As shown in FIGS. 3 and 4, a duct 21 to be described later is connected to the right side plate of the casing body 1A, and a first ventilation for supplying cooling air from the inside of the duct 21 to the casing body 1A. While the cooling air supply port 1D as a port is formed,
The left side plate and the upper side plate of the casing body 1A are respectively formed with cooling air exhaust ports 1E and 1F as second and third ventilation ports for exhausting the cooling air inside the casing body 1A to the outside.

Reference numeral 2 denotes a fixed scroll fixed to the flange portion 1C of the casing 1 via bolts or the like (not shown). The fixed scroll 2 has an end plate 2A formed in a rectangular flat plate and the flange portion 1C. A mounting flange portion 2B formed so that the rear side outer edge of the end plate 2A is projected so as to correspond to the frame shape, and is vertically provided on the back face of the end plate 2A, and the center side of the end plate 2A serves as a winding start end. , A spiral wrap portion 2C whose outer peripheral side is a winding end and a large number of heat radiating plates 2D, 2D which are erected in parallel on the surface of the end plate 2A.
, And a sliding contact surface 2E with the end plate 7A of the orbiting scroll body 7, which will be described later, is formed on the outer side in the radial direction of the wrap portion 2C.

A suction port 2F is formed on the left side of the fixed scroll 2 as shown in FIG. 3, and the suction port 2F is formed.
Communicates with the outermost compression chamber R1 which is the lowest pressure side among the compression chambers R to be described later. Further, a discharge port 2G is formed in the center of the end plate 2A of the fixed scroll 2, and the discharge port 2G communicates with the most central compression chamber R2 of the compression chambers R, which is the highest pressure side.

Reference numeral 3 designates a bearing 4 in the bearing portion 1B of the casing 1.
5 shows a drive shaft that is rotatably supported via 5, and the tip end side of the drive shaft 3 extends into the casing body 1A of the casing 1 to form a crank 3A, and the axis of the crank 3A is the axis of the drive shaft 3. It is eccentric to the axis by a certain dimension.
Further, the drive shaft 3 penetrates the inside of a fan casing 18 described below from one end side of the bearing portion 1B and advances to the outside, and a centrifugal fan 19 and a pulley (not shown) described below are provided on the base end side thereof. The drive shaft 3 is rotationally driven by an electric motor (neither is shown) via a belt on the pulley.

Reference numeral 6 denotes an orbiting scroll arranged in the casing body 1A of the casing 1 so as to face the fixed scroll 2, and the orbiting scroll 6 has a wrap portion 7B on the surface side of an end plate 7A, as will be described later. An orbiting scroll main body 7 which is provided upright and provided with heat radiating plates 7C, 7C, ... on its back side, and a disc-shaped plate-like body 8 attached to the back side of the orbiting scroll body 7 are integrally formed. It is configured.

Reference numeral 7 denotes an orbiting scroll body. The orbiting scroll body 7 is provided with a disk-shaped end plate 7A and is erected on the surface of the end plate 7A. The center side of the end plate 7A serves as the winding start end and the outer peripheral side is It is generally constituted by a spiral wrap portion 7B at the end of winding. The wrap portion 7B of the orbiting scroll body 7 is disposed so as to overlap the wrap portion 2C of the fixed scroll 2 by a predetermined angle, and overlaps with the wrap portion 2C of the fixed scroll 2 and the wrap portion 7B of the orbiting scroll body 7. Between the plurality of compression chambers R,
R, ... Are formed.

When the drive shaft 3 is rotated by the electric motor and the orbiting scroll body 7 (orbiting scroll 6) makes an orbiting motion, the suction port is introduced into the compression chamber R1 on the outermost peripheral side which is the lowest pressure side of each compression chamber R. External air is sucked in through 2F and sequentially compressed in each compression chamber R, while being sequentially fed into the high pressure compression chamber R located in the central side of each compression chamber R to compress the highest pressure side. The gas is discharged from the chamber R2 to an external air tank or the like (not shown) through the discharge port 2G.

Further, a large number of heat radiating plates 7C, 7C, ... Are erected in parallel on the rear surface side of the orbiting scroll body 7, and each of the heat radiating plates 7C transfers the compression heat generated during the compression operation in the casing body 1A. The cooling wind guide is configured to discharge the cooling wind to the cooling air supply port 1D of the casing 1 toward the cooling air exhaust port 1E while discharging the cooling wind to the cooling wind to efficiently cool the orbiting scroll body 7. Further, each of the heat radiating plates 7C also has a function of preventing the heat of the orbiting scroll body 7 from being transferred to the orbiting bearing 13 and the like provided on the large-diameter boss portion 8B of the plate-shaped body 8.

Reference numeral 8 denotes a plate-like member attached to the rear side of the orbiting scroll body 7 by bolts 9, 9, ..., The plate-like body 8 is a disk having a diameter substantially the same as that of the end plate 7A of the orbiting scroll body 7. Disk portion 8A formed in the shape of a circle, and the disk portion 8A
Is generally composed of a large-diameter boss portion 8B that is formed at the center of the back surface of the disk and that is formed to project in the axial direction, and small-diameter boss portions 8C, 8C that are formed to project at three locations on the outer peripheral side of the disk portion 8A. There is. The large-diameter boss portion 8B supports the tip of the crank 3A of the drive shaft 3 via a later-described swivel bearing 13, and each small-diameter boss portion 8C has a bearing 16 described later.
Each of the auxiliary cranks 14 is supported via.

Reference numerals 10, 10, ... Denote a plurality of cooling fins formed on the outer peripheral side of the large-diameter boss portion 8B.
As shown in FIG. 4 and FIG. 5, the number 0 of the large-diameter boss portion 8B protrudes in the radial direction of the large-diameter boss portion 8B and extends in the axial direction into a flat plate shape (thin plate shape) so that the large-diameter boss portion 8B has a radial shape. It is integrally formed on the outer peripheral side. Then, each cooling fin 10 is
The heat dissipation of the large-diameter boss portion 8B is enhanced, and the cooling efficiency of the orbiting bearing 13 in the large-diameter boss portion 8B is improved.

Reference numerals 11, 11, ... Show other cooling fins formed in plural on each small-diameter boss portion 8C.
Are the cooling fins 10 formed on the large-diameter boss portion 8B.
Almost the same as above, it is integrally formed on the outer peripheral side of the small-diameter boss portion 8C so as to project in the radial direction of the small-diameter boss portion 8C, extend in the axial direction into a flat plate shape (thin plate shape), and have a radial shape as a whole. Each of the cooling fins 11 enhances the heat dissipation of the small diameter boss portion 8C and improves the cooling efficiency of the bearing 16 in the small diameter boss portion 8C.

Reference numerals 12 and 12 denote two cooling air guides provided on the back surface of the disk portion 8A of the plate member 8, and each cooling air guide 12 is erected at a right angle to the back surface of the disk portion 8A. Has been done. Each of the cooling air guides 12 is formed in a curved arc shape, and guides the cooling air flowing in the casing body 1A obliquely downward as shown by the arrow in FIG. The gas is smoothly exhausted to the outside through the exhaust port 1E.

Reference numeral 13 denotes a slewing bearing inserted in the inner peripheral side of the large-diameter boss portion 8B of the plate-like body 8. The crank 3A of the drive shaft 3 is inserted in the inner peripheral side of the slewing bearing 13, Slewing bearing 13
Supports the orbiting scroll 6 rotatably with respect to the crank 3A of the drive shaft 3.

Reference numerals 14, 14, ... Denote three auxiliary cranks provided on the outer peripheral side of the back surface of the plate-like body 8. One end of each auxiliary crank 14 is mounted on the back plate of the casing body 1A via a bearing 15. Each of them is rotatably supported, and the other end thereof is rotatably supported by each small-diameter boss portion 8C provided on the plate-shaped body 8 via a bearing 16. The auxiliary cranks 14 prevent the orbiting scroll 6 from rotating when the orbiting scroll 6 orbits. 17
Indicates a balance weight fixed to the drive shaft 3, and the balance weight 17 serves to balance the rotation of the drive shaft 3.

Reference numeral 18 denotes a fan casing attached to one end of the bearing portion 1B of the casing 1. The fan casing 18 is formed in a cylindrical shape with a bottom, and the other side is located on the outer peripheral side of the bearing portion 1B of the casing 1. Cooling air suction port 18
A plurality of A, 18A, ... Are formed in the circumferential direction. Also,
A part of the outer peripheral side of the fan casing 18 communicates with a duct 21 described later, and a cooling air blowing port 18B for blowing cooling air from the fan casing 18 to the duct 21.
Are formed.

Reference numeral 19 denotes a centrifugal fan located inside the fan casing 18 and fixed to the outer peripheral side of the drive shaft 3 by a fixing member 20. The centrifugal fan 19 rotates together with the drive shaft 3 and each of the fan casings 18 is rotated. Cooling air suction port 18A
From the arrow A, the outside air is sucked into the fan casing 18, and the air is used as cooling air from the cooling air blowing port 18B toward the casing main body 1A side via the duct 21 described later as shown by the arrow B. is there.

Reference numeral 21 denotes a duct for guiding the cooling air generated by the centrifugal fan 19 to the casing body 1A side,
One end side of the duct 21 is connected to the cooling air blowing port 18B of the fan casing 18, and the other end side is connected to the cooling air supplying port 1D of the casing body 1A and the cooling air supplying port 22A of the cover 22 described later. .

As a result, the cooling air blown by the centrifugal fan 19 is supplied into the casing body 1A through the cooling air supply port 1D as indicated by arrows C and D in FIG. 3, and flows in the casing body 1A. Then, the heat of the orbiting scroll body 7, the orbiting bearing 13 and the like is taken and exhausted from the cooling air exhaust port 1E as indicated by arrows E and F. At the same time, the cooling air is also supplied to the inside of the cover 22 through the cooling air supply port 22A as indicated by the arrow G, flows through the inside of the cover 22, and the fixed scroll 2
Of the cooling air is exhausted from the cooling air exhaust port 22B as indicated by arrow H.

Reference numeral 22 denotes a cover provided so as to cover the front side of the fixed scroll 2. A cooling air supply port 22A is formed on the right side surface of the cover 22, and the cooling air supply port 2 is provided.
The other end of the duct 21 is connected to 2A. Also,
A cooling air exhaust port 22B is formed on the left side surface of the cover 22, and the cooling air exhaust port 22B is open to the outside. Further, a small hole is formed in the center of the cover 22, a discharge pipe 23 is provided through the small hole, and one end side of the discharge pipe 23 is connected to the discharge port 2G.

The scroll type air compressor according to this embodiment has the above-mentioned structure. Next, the compression operation of the scroll type air compressor will be described.

When the drive shaft 3 is rotated by the electric motor and the orbiting scroll 6 is orbited, the compression chambers R, R, ... Defined between the wrap portion 2C of the fixed scroll 2 and the wrap portion 7B of the orbiting scroll body 7. Is continuously reduced. As a result, the outside air sucked from the suction port 2F of the fixed scroll 2 is sequentially compressed in each compression chamber R, and the compressed air is discharged from the discharge port 2G of the fixed scroll 2 to an external air tank or the like.

Next, to explain the cooling action of the scroll type air compressor, when the drive shaft 3 is rotationally driven by the electric motor, the orbiting scroll 6 orbits to start the air compression operation and, at the same time, the centrifugal fan. 19 rotates. As a result, the outside air is sucked into the fan casing 18 through the cooling air intake port 18A of the fan casing 18 as indicated by an arrow A in FIG. 3, and this air is used as a cooling air from the cooling air blowing port 18B of the fan casing 18 as indicated by an arrow B. Thus, the cooling air is supplied through the duct 21 to the cooling air supply port 1D of the casing body 1A as indicated by arrows C and D, and is also supplied to the cooling air supply port 22A of the cover 22 as indicated by arrow G.

Then, a part of the cooling air that has flowed into the casing body 1A from the cooling air supply port 1D flows into the back side of the plate-like body 8 as shown by arrow C, and as shown by the arrow in FIG. Flowing on the back side of the body, the large-diameter boss portion 8B and each small-diameter boss portion 8
After cooling C, it flows out from the cooling air exhaust ports 1E and 1F.

At this time, the large-diameter boss portion 8B and the small-diameter boss portion 8
Since the cooling fins 10 and 11 are provided on the outer peripheral side of C, the heat radiation area (surface area) of the large-diameter boss portion 8B and the small-diameter boss portion 8C is greatly expanded, and there are many portions in contact with the cooling air. As a result, the heat dissipation of the large-diameter boss portion 8B and each small-diameter boss portion 8C is significantly improved, and the swivel bearing 13 provided in the large-diameter boss portion 8B and the bearing 16 provided in each small-diameter boss portion 8C are provided. It can be cooled efficiently.

Since the large-diameter boss portion 8B and each small-diameter boss portion 8C move at high speed in the cooling wind by the orbiting motion of the orbiting scroll 6, the large-diameter boss portion 8B and each small-diameter boss portion 8C are provided. When the cooling air is agitated by the respective cooling fins 10 and 11, the cooling air is also generated by the swirling motion of the cooling fins 10 and 11. Thereby, the heat dissipation of the large-diameter boss portion 8B and each small-diameter boss portion 8C is further improved, and the swivel bearing 13 provided in the large-diameter boss portion 8B and the bearing 16 provided in each small-diameter boss portion 8C are provided. It can be cooled more efficiently. Therefore, the slewing bearing 1
3. It is possible to reliably prevent each bearing 16 from reaching a high temperature due to self-heating due to friction during rotation.

Furthermore, the cooling air flowing through the casing body 1A by the cooling air guides 12 provided on the back surface of the plate-like body 8 smoothly flows toward the cooling air exhaust port 1E. This can prevent the cooling air from stagnating in the casing body 1A, which can also improve the cooling efficiency.

The cooling air flowing into the casing body 1A also flows between the orbiting scroll body 7 and the plate-like body 8 as shown by the arrow D, and
The heat sink 7C and the plate-shaped body 8 are cooled. Further, most of the compression heat can be taken away by the cooling air flowing between the orbiting scroll body 7 and the plate body 8, so that the compression heat can be prevented from being transmitted to the plate body 8 side. As a result, the swivel bearing 13 in the large diameter boss portion 8B and the small diameter boss portion 8C
It is possible to reliably prevent the inner bearing 16 from reaching a high temperature due to conduction of compression heat.

On the other hand, the cooling air that has flowed into the cover 22 through the cooling air supply port 22A flows through the cover 22 to cool the fixed scroll 2 as shown by the arrow G, and then from the cooling air exhaust port 22B to the outside air. It flows out as shown by arrow H. At this time, since the fixed scroll 2 is provided with the heat dissipation plates 2D, 2D, ..., The fixed scroll 2 can be efficiently cooled by the respective heat dissipation plates 2D.

Thus, in this embodiment, the large diameter boss portion 8B is
Each cooling fin 10 is provided on the outer peripheral side, and a cooling air is generated by the centrifugal fan 19 and the duct 21. The cooling air is supplied from the cooling air supply port 1D into the casing body 1A and passed through the casing body 1A. Since the cooling air exhaust ports 1E and 1F are configured to exhaust air, the large-diameter boss portion 8
The heat dissipation of B can be greatly improved, and the swivel bearing 13 in the large-diameter boss portion 8B can be efficiently cooled.

As a result, the slewing bearing 13 is prevented from self-heating due to friction during rotation and the like, and is prevented from reaching a high temperature.
The life of the slewing bearing 13 can be extended. Further, it is possible to extend the life of the grease in the slewing bearing 13, and it is possible to reliably prevent the grease in the slewing bearing 13 from melting and leaking and damaging the slewing bearing 13.

Further, according to this embodiment, each small-diameter boss portion 8 is
Since the cooling fins 11 are also provided on the outer peripheral side of C, they are provided in the small-diameter boss portions 8C, and the auxiliary crank 14 is provided.
It is possible to efficiently cool the bearing 16 that supports the
It is possible to extend the life of the bearing 16.

Further, since the cooling air guides 12 provided on the back surface of the plate-like body 8 can smoothly exhaust the cooling air to the outside through the cooling air exhaust port 1E of the casing body 1A, the cooling air can be easily discharged. Stagnation can be prevented and cooling efficiency can be improved.

Therefore, according to this embodiment, the slewing bearing 1
3. Since the durability of each bearing 16 and the like can be significantly improved, it is possible to lengthen the maintenance cycle of the scroll type air compressor and improve the operating rate.

Further, according to this embodiment, the centrifugal fan 19
The cooling wind generated by the duct 21 is supplied into the casing body 1A and the cover 22 by the duct 21 to cool both the orbiting scroll 6 and the fixed scroll 2 at the same time. Wrap portion 7B of wrap and wrap portion 2 of fixed scroll 2
It is possible to reliably prevent C from being thermally deformed, and
It is possible to prevent contact of 2C and the like. Therefore, the durability of the scroll type air compressor can be significantly extended, and the reliability can be improved.

Further, according to the present embodiment, since only one centrifugal fan 19 is used to cool both the orbiting scroll 6 and the fixed scroll 2, as described in the prior art, the two centrifugal fans 19 are used. Since it is not necessary to provide a fan for the above, it is possible to prevent the apparatus from becoming large and complicated. Further, since only one centrifugal fan 19 is rotationally driven, the driving force applied to the drive shaft 3 can be small, and the required driving force can be obtained by a small electric motor. Therefore, manufacturing costs and running costs can be significantly reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. 6. The feature of the present embodiment is that the outer peripheral side of the boss portion of the orbiting scroll is projected in the radial direction of the boss portion and the shaft is protruded. A plurality of cooling fins extending in the direction is provided, and the tip side of each cooling fin is bent into a substantially "V" shape. 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.

In the figure, 31, 31, ... Denote cooling fins provided on the large-diameter boss portion 8B.
In the same manner as the cooling fins 10 described in the first embodiment, 1 projects in the radial direction of the large-diameter boss portion 8B and extends in the axial direction into a flat plate shape (thin plate shape) so as to form a radial shape as a whole. , Is integrally formed on the outer peripheral side of the large-diameter boss portion 8B. However, in each of the cooling fins 31 according to the present embodiment, the tip end portion thereof is substantially “ku” at an angle α (for example, angle α = 30 degrees) with respect to the extension direction of the base end portion of the cooling fin 31. It is bent into a letter shape. In addition, in FIG.
Although the tip end portion and the base end portion of each cooling fin 31 are abruptly bent at the bent portion, the bent portion may be smoothly bent. In addition, the large-diameter boss portion 8
The cooling fins 31 according to the present embodiment provided in B may be provided on the outer peripheral side of each small diameter boss portion 8C.

The scroll type air compressor according to the present embodiment having such a structure also has substantially the same operational effects as those of the first embodiment. In particular, by bending the tip portion of each cooling fin 31, when the large-diameter boss portion 8B or the like moves at high speed in the cooling air due to the orbiting movement of the orbiting scroll 6, the cooling air is effectively applied by each cooling fin 31. With stirring, cooling air can be further generated. Thereby, the heat dissipation of the large-diameter boss portion 8B and the like is further improved, and the cooling efficiency of the orbiting bearing 13 and the like provided in the large-diameter boss portion 8B can be further improved.

In each of the above embodiments, the large diameter boss portion 8 is used.
B, each cooling fin 10 (31), 11 on the small diameter boss 8C
However, the present invention is not limited to this, and the cooling fins 10 (31) and 11 may be attached later by means such as bonding.

In each of the above embodiments, the large diameter boss portion 8 is used.
B, the cooling fins 10 (3
Although a large number of 1) and 11 are provided so as to be radial as a whole, the present invention is not limited to this, and for example, the large-diameter boss portion 8 is used.
B, two cooling fins 10 on the outer peripheral side of the small diameter boss portion 8C
(31) and 11 may be arranged at intervals of 180 degrees, or three cooling fins 10 (31) and 11 may be arranged at intervals of 120 degrees.
Four, five, ... Cooling fins 10 (31) and 11 may be provided.

Further, in the above embodiment, 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, and a vacuum pump or the like. Can also be applied to.

[0060]

As described above in detail, according to the present invention, the casing is provided with a vent for allowing cooling air to flow inside and outside the casing, and on the outer peripheral side of the boss portion of the orbiting scroll,
Since a plurality of cooling fins protruding in the radial direction of the boss portion and extending in a plate shape in the axial direction are provided, the heat dissipation of the boss portion can be significantly improved, and the swivel bearing provided in the boss portion can be improved. Can be cooled effectively. As a result, the heat of compression generated during compression is conducted,
Alternatively, it is possible to reliably prevent the temperature of the slewing bearing from rising due to frictional heat when the slewing bearing rotates.

Therefore, the swivel bearing can be surely prevented from being deteriorated early by high temperature heat, and the grease in the swivel bearing can be surely prevented from melting and leaking due to the compression heat and the frictional heat. In addition, the durability and reliability of the scroll type fluid machine can be greatly improved.

[Brief description of drawings]

FIG. 1 is an external view showing a scroll air compressor according to a first embodiment of the present invention.

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

3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a vertical sectional view showing an orbiting scroll according to the first embodiment.

FIG. 6 is a transverse cross-sectional view showing a large-diameter boss portion and the like of a scroll air compressor according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Casing 1D Cooling air supply port (vent) 1E, 1F Cooling air exhaust port (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 Plate shape Body 8B Large-diameter boss (boss) 8C Small-diameter boss 10, 11, 31 Cooling fins 13 Orbiting bearing 19 Centrifugal fan 21 Duct 22 Cover

Claims (1)

[Claims] 1. A casing, a fixed scroll fixed to the casing and having a spiral wrap portion erected on an end plate, a base end rotatably supported by the casing, and a tip end positioned in the casing and a crank. A drive shaft, and a orbiting scroll that is provided in the casing, has a spiral wrap portion standing on the front surface side of the end plate and overlapping the wrap portion of the fixed scroll, and a boss portion on the rear surface side, In a scroll type fluid machine comprising a orbiting bearing provided on a boss portion of the orbiting scroll for rotatably supporting the orbiting scroll on a crank of the drive shaft, the casing has cooling air inside or outside the casing. A vent hole is provided to allow the cooling scroll to flow, and a plurality of cold protrusions extending in the radial direction of the boss portion and extending in the axial direction in a plate shape are provided on the outer peripheral side of the boss portion of the orbiting scroll. A scroll type fluid machine characterized by having a cooling fin.