JP2000230489A - Scroll type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize size reduction and simple structure of a counterweight while keeping cooling efficiency by providing the counterweight with a weight member serving as the cooling fan. SOLUTION: A casing 1 is provided with a fixed scroll 2, a driving shaft 3, and a turning scroll 5. A slider 14 restricts rotation of the turning controller during turning. A plurality of weights 17 are disposed on a rotary plate of a counterweight along its circumferential direction each spaced at an interval. An end plate 5A of the turning scroll 5 is provided with a cooling fin 8. As a result, cooling air can be efficiently circulated into cooling air passages 18, 19, 20 formed on both sides of the slider 14, thus enhancing cooling efficiency in the easing 1.

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 and a vacuum pump.

[0002]

2. Description of the Related Art In general, a scroll type fluid machine used for an air compressor, a vacuum pump, or the like, orbits a revolving scroll with respect to a fixed scroll, and changes the volume of a compression chamber between the revolving scroll and the air. And the like.

[0003] A scroll-type air compressor according to this type of prior art is provided with a casing, a fixed scroll provided with a spiral wrap portion on a head plate provided on the casing, and rotatably provided on the casing, A plurality of compression chambers are defined between a drive shaft extending axially in the casing and having a crankshaft at the tip end and a spiral wrap provided on the front side of the end plate. A orbiting scroll in which a boss provided on the back side of the end plate is rotatably fitted to the crankshaft; a rotation preventing mechanism for preventing rotation of the orbiting scroll; and a slider back surface of the rotation preventing mechanism. And a counter weight that is provided on the outer peripheral side of the drive shaft and is configured to rotate integrally with the drive shaft (for example, Japanese Utility Model Application Laid-Open No. 62-66285). Broadcast, etc.).

[0004] Here, the casing is formed in a bottomed cylindrical shape whose one end side is open, and an annular extending portion extending inward in the radial direction is provided on the inner periphery of the open side. In addition, cooling air circulation ports are provided on the bottom side and the outer peripheral side of the casing. Further, the fixed scroll is mounted on the opening side of the casing.

The orbiting scroll is disposed between the extending portion of the casing and the fixed scroll, and has an annular projection having a ventilation hole formed on the back side thereof, and the annular projection slides on the extending portion of the casing. Thus, an axial gap serving as a cooling air passage is formed between the extending portion of the casing and the end plate of the orbiting scroll.

Further, on the back side of the orbiting scroll, an annular gap is formed between the outer periphery of the boss portion and the inner periphery of the extending portion of the casing. Further, a cylindrical cooling fan is mounted on the front side of the counterweight, and the tip side of the cooling fan projects through the annular gap into a cooling air passage between the rear side of the orbiting scroll and the extending portion of the casing. At the same time, the inner peripheral side of the cooling fan is another cooling air passage communicating with the cooling air passage.

In the scroll type air compressor of the prior art constructed as described above, the orbiting scroll is rotationally driven relative to the fixed scroll by rotating the drive shaft from the outside, thereby being provided on the outer peripheral side of the fixed scroll. While sucking fluid (air) from the suction port, the fluid is sequentially compressed in each compression chamber between the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll, and the compressed fluid is compressed from the discharge port provided at the center of the fixed scroll. To the outside.

In this case, when the cooling fan rotates together with the counterweight, the cooling air flows into the cooling air passage in the cooling fan from the circulation port on the bottom side of the casing. Then, the cooling air flows through the cooling air passage between the extending portion of the casing and the end plate of the orbiting scroll, and also flows into the ventilation hole of the annular projection of the orbiting scroll. After cooling, it flows out from the circulation port on the outer peripheral side of the casing.

[0009]

By the way, in the above-mentioned prior art, a cooling air passage is provided on the back side of the orbiting scroll by providing an extending portion on the casing and providing an annular projection having a ventilation hole on the back side of the orbiting scroll. Is formed. Then, the cooling fan attached to the counterweight is configured to protrude into the cooling air passage.

For this reason, it is not only necessary to provide an annular extending portion on the casing, or to provide an annular projection on the orbiting scroll, but also to direct the cooling fan from the counterweight between the casing extending portion and the orbiting scroll. Since it must be extended so as to sandwich it, the structure of the casing itself and the structure of the cooling air passage provided in the casing are complicated, and the structure of the counterweight is also easy to increase in size, especially in the axial direction. There is a problem that it is difficult to form a compact.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to simplify the structure of a casing, a cooling air passage, and the like, and to reduce the size of a counterweight, a cooling fan, and the like. Another object of the present invention is to provide a scroll-type fluid machine capable of forming a casing and the like compact.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a casing, a fixed scroll provided with a spiral wrap portion on a head plate provided on the casing, and a rotatable casing mounted on the casing. And a drive shaft having a crankshaft at the tip end extending in the axial direction in the casing, and a spiral wrap portion provided on the front side of the end plate having a plurality of wrap portions between the fixed scroll wrap portion. While defining a compression chamber, a boss provided on the back side of the head plate is located between the orbiting scroll rotatably fitted to the crankshaft and the back surface of the head plate of the orbiting scroll and the casing. Anti-rotation mechanism for preventing rotation of the orbiting scroll by a plate-like slider slidably provided in two radial directions orthogonal to each other, and a rear surface of the anti-rotation mechanism located on the slider rear side. Provided on an outer peripheral side of the drive shaft Te,
The present invention is applied to a scroll type fluid machine including the drive shaft and a counter weight which rotates integrally.

A feature of the structure adopted in the first aspect of the present invention is that the counterweight projects from a rotating plate fixed to an outer peripheral side of the drive shaft at a circumferential direction on a front side of the rotating plate. A plurality of weight members that also serve as a cooling fan, and a cooling air passage through which cooling air generated by each weight member of the counterweight is provided on the front side and the back side of the slider. The cooling air passing through the passage cools the rear side of the orbiting scroll.

With this configuration, during the orbiting movement of the orbiting scroll, each weight member is also rotated as a cooling fan while balancing the load due to centrifugal force between the counterweight and the orbiting scroll. Can be. Therefore, the cooling air can be circulated to both sides of the slider by these weight members, and the rear side and the like of the orbiting scroll can be cooled.

Further, in the invention according to claim 2, the cooling air passage is provided between a rear surface side of the end plate of the orbiting scroll and a front surface of the slider, and a cooling air passage of the orbiting scroll. A second cooling air passage provided between the outer periphery of the boss and an opening formed on the inner periphery of the slider;
The scroll-type fluid machine according to claim 1, further comprising a third cooling air passage provided between the back side of the slider and the counterweight.

Thus, when the orbiting scroll is turned, the cooling air can be circulated through the first, second and third cooling air passages by using the counter weight. Can be cooled on both sides.

Further, in the third aspect of the present invention, a plurality of cooling fins extending radially outward from the boss portion are provided on the rear surface side of the end plate of the orbiting scroll so as to face the cooling air passage.

With this arrangement, when the orbiting scroll is turned, the cooling air flowing through the cooling air passage can be brought into contact with the cooling fins of the orbiting scroll. Thereby, the cooling air in the passage can be stirred.

Further, the rotating plate of the counterweight is formed in a disk shape eccentric in the radial direction with respect to the center of the drive shaft, so that a large number of weight members can be rotated. The cooling air can be smoothly circulated using these weight members.

Further, the rotating plate of the counter weight is formed in a fan shape, so that the cooling air can be efficiently agitated by using the entire counter weight rotating together with the drive shaft. it can.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An oilless scroll type air compressor will be described as an example of a scroll type fluid machine according to an embodiment of the present invention and will be described in detail with reference to FIGS. Here, FIGS. 1 to 6 show a first embodiment according to the present invention.

Reference numeral 1 denotes a bottomed cylindrical casing which forms an outer frame of the scroll type air compressor. The casing 1 has a cylindrical portion 1A having an opening at one end in the axial direction, and a cylindrical portion 1A at the other end of the cylindrical portion 1A. It comprises an annular bottom 1B provided and a bearing 1C protruding on the inner peripheral side of the bottom 1B.

FIG. 1 shows a bottom 1B of the casing 1.
As shown in FIG. 3, for example, four cylindrical thrust load supporting portions 1D, 1D,... Are axially protruded toward a later-described orbiting scroll 5, and each of the thrust load supporting portions 1D has a circumferential direction. Are arranged at intervals. further,
The cylindrical portion 1A is provided with, for example, four cooling air inlets 1E, and the bottom 1B is provided with four cooling air outlets 1F.

Reference numeral 2 denotes a fixed scroll fixed to the distal end side of the casing 1. The fixed scroll 2 has a substantially disk shape and is disposed so that the center thereof coincides with an axis O1-O1 of a drive shaft 3 described later. A head plate 2A, a spirally wound wrap portion 2B erected on the front side of the head plate 2A, and an axially projecting outer peripheral side of the head plate 2A so as to surround the wrap portion 2B. And a cylindrical portion 2C attached to the main body.

Reference numeral 3 denotes a bearing 4 in a bearing 1C of the casing 1.
A drive shaft rotatably supported through the drive shaft 3
Has a base end connected to a drive source (not shown) such as an electric motor outside the casing 1, and a distal end serving as a crankshaft 3 </ b> A extending in the casing 1 in the axial direction. And
The axis O2-O2 of the crankshaft 3A is eccentric with respect to the axis O1-O1 of the drive shaft 3 by a dimension δ.

Reference numeral 5 denotes a revolving scroll provided in the casing 1 so as to be revolvable opposite the fixed scroll 2. The revolving scroll 5 comprises a disk-shaped end plate 5A and a front surface of the end plate 5A. A spirally wound wrap portion 5B erected in the axial direction, and a boss portion 5C provided at the center on the rear side of the end plate 5A and rotatably fitted with the crankshaft 3A of the drive shaft 3 via the slewing bearing 6 It is composed of

The orbiting scroll 5 is disposed so as to overlap with the wrap portion 2B of the fixed scroll 2 by, for example, 180 degrees, and both wrap portions 2B and 5B
A plurality of compression chambers 7, 7, ... are defined therebetween. During the operation of the scroll type air compressor, the air is sucked into the compression chamber 7 on the outer peripheral side from the suction port (not shown) provided in the fixed scroll 2 while the orbiting scroll 5
After the compression in each compression chamber 7 sequentially during the revolving motion,
Compressed air is discharged from the compression chamber 7 on the center side to the outside through a discharge port (not shown).

, 8, ... are end plates 5A of the orbiting scroll 5.
The cooling fins 8 are formed integrally with each other, and each of the cooling fins 8 is a metal plate projecting in the axial direction from the rear side of the end plate 5A so as to face a cooling air passage 18 to be described later, as shown in FIGS. And radially extends radially around the boss 5C of the orbiting scroll 5. The cooling fins 8 promote heat radiation from the orbiting scroll 5 to the cooling air passages 18 and the like, and stir the cooling air in the cooling air passages 18 at the time of turning.

Reference numeral 9 denotes an anti-rotation mechanism provided between the rear side of the end plate 5A and the casing 1 to prevent the rotation of the orbiting scroll 5, and the anti-rotation mechanism 9 includes first guides 10, 10 described later. , ..., the second guide 12, 12, ...,
The slider 14 and the like constitute a so-called Oldham coupling.

Are the bottom 1B of the casing 1.
Each of the guides 10 is formed in an elongated rectangular column extending upward and downward, as shown in FIG. 2, and surrounds a counter weight 15 described later. It is arranged at four places apart from each other at the top, bottom, left and right. Also, in the vicinity of the guide 10, four protrusions 11, 11,... Protruding from the bottom 1B of the casing 1 with a certain dimension in the axial direction are provided.

Reference numerals 12, 12,... Denote, for example, four second guides protruding from the rear side of the end plate 5A of the orbiting scroll 5. Each of the guides 12 is a guide 10 as shown in FIG.
The cooling fins 8 are formed at four locations separated from each other in the upper, lower, left, and right directions so as to surround the cooling fins 8. In the vicinity of the guide 12, four protrusions 13, 13,... Protruding in the axial direction with a certain size from the rear side of the end plate 5A are provided.

Numeral 14 denotes a substantially rectangular slider disposed inside the guides 10, 12, and the slider 14 is formed of, for example, a lightweight metal material or a high-strength resin material. At the four corners of the slider 14, four sliding contact projections 14A, 14A,... 4 in sliding contact with 12
Are provided so as to protrude toward the front side. A circular opening 14C is provided in the center of the slider 14, and a boss 5C of the orbiting scroll 5 is inserted into the opening 14C with a gap as shown in FIG.

The slider 14 is mounted on each sliding contact projection 14.
A is in contact with the projection 11 of the casing 1, and the tip of each sliding contact projection 14 </ b> B is in the projection 13 of the orbiting scroll 5.
Is in contact with As a result, the slider 14 is axially positioned between the bottom 1B of the casing 1 and the rear side of the end plate 5A, and is arranged with a gap between the slider 14 and the end plate 5A.

The slider 14 is guided by the guide 10 only upward and downward with respect to the casing 1 via the sliding contact projection 14A, and is guided by the guide 12 to the left and right sides of the orbiting scroll 5 via the sliding contact projection 14B. Guided only in direction. Thus, the rotation preventing mechanism 9 prevents the orbiting scroll 5 from performing a circular motion (orbiting motion) having a turning radius of the dimension δ with respect to the fixed scroll 1 while preventing the orbiting scroll 5 from rotating by the slider 14. Forgive.

Numeral 15 denotes a counterweight provided on the crankshaft 3A of the drive shaft 3 located on the back side of the slider 14, and the counterweight 15 is, as shown in FIGS. 5 and 6, a base end of the crankshaft 3A. The rotating plate 16 includes a disk-shaped rotating plate 16 fixed to the side thereof, and a plurality of weights 17, 17,... Fixed or integrally formed on the front surface of the rotating plate 16.

Here, the center O3 of the rotary plate 16 is arranged eccentrically from the center O2 of the crankshaft 3A by a dimension ε1 and is also eccentrically arranged from the center O1 of the drive shaft 3 by a certain dimension. The rotating plate 16 is fixed to the proximal end of the crankshaft 3A, and the distal end of the crankshaft 3A is axially positioned in the casing 1 by being inserted into the boss 5C of the orbiting scroll 5.
4 with a gap.

The weights 17 are arranged at substantially equal intervals around the entire circumference of the rotary plate 16.
The center of gravity of the entire rotary orbiting scroll 5 around the drive shaft 3 is caused by the rotation plate 16 being eccentric with respect to the crankshaft 3A.
And the load due to the centrifugal force. Further, the weight 17 protrudes in the axial direction from the rotary plate 16 toward a cooling air passage 20 to be described later, and rotates together with the drive shaft 3 as described later to thereby form the cooling air passage 1.
A cooling fan that allows cooling air to flow through 8, 19, and 20 is provided.

Numeral 18 denotes a first cooling air passage provided between the rear side of the end plate 5A of the orbiting scroll 5 and the front side of the slider 14, and as shown in FIG. Each of the cooling fins 5 protrudes. Thereby, the cooling air passage 18 cools the orbiting scroll 5 from the back side through the cooling fins 8 and the like.

Reference numeral 19 denotes a second cooling air passage provided between the boss 5C of the orbiting scroll 5 and the opening 14C of the slider 14, and the cooling air passage 19 connects the cooling air passages 18 and 20 radially inward. It communicates and cools the swing bearing 6 and the like.

Reference numeral 20 denotes a third cooling air passage provided between the rear surface of the slider 14 and the front surface of the counter weight 15, and each weight 17 of the counter weight 15 protrudes from the cooling air passage 20. .

Are metal spheres provided so as to be able to roll between the thrust load supporting portion 1D of the casing 1 and the back side of the orbiting scroll 5, and each of the spheres 21 is a orbiting scroll. 5 to receive the load in the thrust direction applied to the load 5.

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

First, when the drive shaft 3 is rotated by an electric motor or the like, the orbiting scroll 5 makes a orbital movement around the drive shaft 3 with a turning radius of the dimension δ around the drive shaft 3 in a state where the rotation is restricted by the rotation preventing mechanism 9. The compression chambers 7 are continuously reduced between the fixed scroll 2 and the orbiting scroll 5. As a result, the outside air sucked from the suction port of the fixed scroll 2 is compressed in each of the compression chambers 7 and discharged as compressed air from the discharge port of the fixed scroll 2 to an external air tank or the like.

At this time, the counterweight 15 rotates integrally with the crankshaft 3A, balances the load due to the centrifugal force with the orbiting scroll 5 around the drive shaft 3, and thereby causes vibration, noise, etc. during the orbiting operation. To reduce.

Further, each weight 17 is provided with a cooling air passage 20.
In the casing 1, cooling air flows into the cooling air passage 18 from the cooling air inlet 1E as shown by an arrow A shown in FIGS. 3 and 2, for example. As shown by arrow B, the orbiting scroll 5 is cooled from the rear side through the cooling fins 8 while being stirred by the respective cooling fins 8. Then, this cooling air flows through the cooling air passage 20 through the cooling air passage 19 as shown by arrow C, and after cooling the swing bearing 6, the slider 14 and the like as shown by arrow D, the cooling air of the casing 1 as shown by arrow E. Cooling air outlet 1
It flows out of F.

Thus, in the present embodiment, the counter weight 15 is constituted by the rotating plate 16 and the plurality of weights 17 which also serve as a cooling fan. The cooling air passages 18, 19, and 20 for circulating the cooling air are provided on the side of the scroll type air compressor. The balance can be stably maintained, and vibration, noise, and the like due to the turning motion can be reliably reduced.

The cooling air in the cooling air passage 20 can be smoothly circulated through the cooling air passages 18 to 20 while stirring the cooling air in the cooling air passage 20 by the weights 17 rotating together with the drive shaft 3. Slewing bearing 6,
The two sides of the slider 14 can be efficiently cooled,
The durability as a compressor can be improved.

Therefore, according to the present embodiment, each weight 17 of the counter weight 15 can be used as both a weight member and a cooling fan, and these structures can be integrated and simplified, and the dimensions thereof can be particularly reduced. , And the casing 1 and the like can be made compact.

Further, a first cooling air passage 18 is provided between the back side of the orbiting scroll 5 and the front side of the slider 14,
Boss portion 5C of orbiting scroll 5 and opening 1 of slider 14
4C, a third cooling air passage 20 is provided between the back side of the slider 14 and the counterweight 15, so that the inside of the casing 1 is front and rear. Even in a state where the plate-shaped slider 14 is arranged so as to partition, the cooling air passages 18 to 20 extending from the rear side of the orbiting scroll 5 to the rear side of the slider 14 via the periphery of the orbiting bearing 6 can be formed compactly. Therefore, the cooling air can be efficiently sent to both sides of the slider 14, and the cooling efficiency of the orbiting scroll 5, the orbiting bearing 6, the slider 14, and the like can be improved.

Further, since the cooling fins 8 are provided on the back side of the orbiting scroll 5 so as to face the cooling air passages 18, the cooling air flowing through the cooling air passages 18 is cooled by the cooling fins during the orbiting movement of the orbiting scroll 5. The gas can be circulated through the cooling air passages 19 and 20 while being stirred by the cooling air 8, and the circulation of cooling air and the heat radiation from the orbiting scroll 5 can be further promoted.

The rotating plate 16 of the counterweight 15
Is formed in a disk shape eccentric with respect to the center O2 of the crankshaft 3A, so that a large number of weights 17 serving as a cooling fan can be provided over the entire circumference of the rotary plate 16 while maintaining the function of the counterweight 15 as a balancer. The cooling air can be smoothly circulated using these weights 17.

Next, FIGS. 7 and 8 show a second embodiment according to the present invention.
In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

Reference numeral 31 denotes a counter weight of the scroll type air compressor according to the present embodiment.
1 includes a rotating plate 32 and a plurality of weights 33, 33,... Fixed or integrally formed on the front side of the rotating plate 32 as cooling fins, similarly to the counterweight 15 according to the first embodiment. It is composed of However, in the present embodiment, the rotating plate 32 is formed of a semicircular metal plate or the like, and its center O4 is arranged eccentrically from the center O2 of the crankshaft 3A by the dimension ε2.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained. And especially in this embodiment,
By arranging the rotating plate 32 and the weight 33 in a semicircular shape, the cooling air in the cooling air passage 20 and the like can be greatly swirled by largely rotating the counter weight 31, and the stirring efficiency of the cooling air can be further increased. be able to.

In each of the above embodiments, the weights 17, 17 are attached to the rotating plates 16, 32 of the counter weights 15, 31.
Although the configuration is such that the 33 is fixedly or integrally formed, the present invention is not limited to this, and the weight may be mounted on the rotating plate using, for example, mounting screws, rivets and the like.

In each of the above embodiments, a scroll type air compressor has been described as an example of a scroll type fluid machine. However, the present invention is not limited to this, and may be applied to a vacuum pump, a refrigerant compressor, and the like. Applicable.

[0057]

As described above in detail, according to the first aspect of the present invention, the counterweight is constituted by the rotating plate and the plurality of weight members which also serve as the cooling fan, and the respective weights are provided in the casing. Since a cooling air passage for circulating cooling air on both sides of the slider is provided by the member,
During operation of the scroll-type fluid machine, the balance of the load due to the centrifugal force can be stably maintained by the counterweight, and the vibration, noise, and the like due to the turning motion can be reliably reduced. The cooling air in the cooling air passage can be smoothly circulated by each weight member, thereby efficiently cooling the orbiting scroll, the orbiting bearing in the boss portion, the both sides of the slider, etc., and improving the durability. Can be done. Therefore, a counterweight and a cooling fan can be used, and these structures can be integrated and simplified, and their dimensions can be reduced particularly in the axial direction of the drive shaft, and the casing and the like can be formed compact. .

According to the second aspect of the present invention, since the cooling air passage is constituted by the first, second and third cooling air passages, the plate-like slider is disposed so as to partition the inside of the casing forward and backward. In this state, the cooling air passage extending from the back side of the orbiting scroll to the back side of the slider through the periphery of the boss can be formed compactly, and the cooling air can be efficiently sent to both sides of the slider, and Also, the cooling efficiency of the slewing bearing, the slider, and the like in the boss can be improved.

Further, according to the third aspect of the present invention, since a plurality of cooling fins are provided on the rear side of the end plate of the orbiting scroll, the cooling air flowing through the cooling air passage is cooled during the orbiting movement of the orbiting scroll. It can be distributed while being stirred by the fins, and the distribution of the cooling air and the heat radiation from the orbiting scroll can be further promoted.

According to the fourth aspect of the present invention, the rotating plate of the counterweight is formed in a disk shape eccentric in the radial direction with respect to the center of the drive shaft. A number of weight members serving as a cooling fan can be arranged over the entire circumference of the rotating plate while maintaining the function, and the cooling air can be smoothly circulated using these weight members.

According to the fifth aspect of the present invention, since the rotating plate of the counter weight is formed in a fan shape, the cooling air in the cooling air passage is efficiently stirred by rotating the entire counter weight largely. It is possible,
The stirring efficiency of the cooling air can be further increased.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a casing, a counterweight, and the like, as viewed from the direction of arrows II-II in FIG.

FIG. 3 is an enlarged view of a main part in FIG. 1 showing a counter weight and the like.

FIG. 4 shows the back side of the orbiting scroll and the slider with the casing and the counterweight removed in FIG.
It is the rear view seen from the IV-IV direction.

FIG. 5 is an exploded perspective view showing an orbiting scroll, a slider, a counterweight and the like.

FIG. 6 is a front view showing a counter weight according to the first embodiment.

FIG. 7 is a cross-sectional view of a scroll-type air compressor according to a second embodiment of the present invention, viewed from the same position as in FIG.

FIG. 8 is a front view showing a counter weight in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Fixed scroll 2A, 5A End plate 2B, 5B Lapping part 3 Drive shaft 3A Crankshaft 5 Orbiting scroll 5C Boss part 7 Compression chamber 8 Cooling fin 9 Rotation prevention mechanism 10 First guide 12 Second guide 14 Slider 14C Opening 15, 31 Counter weight 16, 32 Rotating plate 17, 33 Weight (weight member) 18 First cooling air passage 19 Second cooling air passage 20 Third cooling air passage

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshikazu Harashima 1-3-6 Fujimi, Kawasaki-ku, Kawasaki, Kanagawa Prefecture Inside Tokiko Corporation (72) Inventor Hiroyuki Mihara 1-6-1, Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture No. 3 F-term in Tokiko Corporation (reference) 3H029 AA02 AA15 AA23 AB02 AB06 BB12 BB32 CC03 CC05 CC09 CC16 CC30 CC47 3H039 AA02 AA09 AA10 AA12 BB08 BB13 CC02 CC03 CC08 CC10 CC12 CC15 CC20 CC33 CC49

Claims (5)

[Claims] 1. A casing, a fixed scroll provided on the casing and provided with a spiral-shaped wrap portion on a head plate, and a crankshaft having a tip end rotatably provided on the casing and extending in the casing in an axial direction. And a spiral wrap portion provided on the front side of the head plate defines a plurality of compression chambers between the fixed scroll and the wrap portion, and is provided on the back side of the head plate. A orbiting scroll having a boss portion rotatably fitted to the crankshaft; and a plate-shaped member provided between the rear surface of the end plate of the orbiting scroll and the casing and slidable in two orthogonal radial directions. A rotation preventing mechanism for preventing rotation of the orbiting scroll by the slider, and an outer circumferential side of the drive shaft positioned on the rear surface side of the slider of the rotation preventive mechanism and integrally rotating with the drive shaft. In a scroll-type fluid machine including a rotating counterweight, the counterweight includes a rotating plate fixed to an outer peripheral side of the drive shaft, and a cooling fan protruding from a front surface of the rotating plate at a circumferential interval. A plurality of weight members that also serve as cooling air passages for circulating cooling air generated by the weight members of the counterweight on the front and back sides of the slider, and cooling air passing through the cooling air passages. A scroll-type fluid machine characterized in that a back side of the orbiting scroll is cooled by the above configuration. 2. The cooling air passage includes: a first cooling air passage provided between a rear surface of the end plate of the orbiting scroll and a front surface of the slider; It is composed of a second cooling air passage provided between the opening formed on the inner peripheral side and a third cooling air passage provided between the back side of the slider and the counter weight. The scroll fluid machine according to claim 1. 3. On the back side of the end plate of the orbiting scroll,
The scroll fluid machine according to claim 1, wherein a plurality of cooling fins extending radially outward from the boss portion are provided so as to face the cooling air passage. 4. The scroll-type fluid machine according to claim 1, wherein the rotary plate of the counterweight is formed in a disk shape eccentric in a radial direction with respect to the center of the drive shaft. 5. The scroll-type fluid machine according to claim 1, wherein the rotating plate of the counterweight is formed in a fan shape.