JP2000161250A - Scroll type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the behabior by receiving the autorotation of a turning scroll constantly, as well as by increasing the durability of a slider and the like by making it into a small size. SOLUTION: Between a casing 1 and a turning scroll 4, three autorotation preventive mechaniss 9, 13, and 17 are provided. And the casing side guides 10, 14, and 18 of the autorotation preventive mechanisms 9, 13, and 17 are provided to the casing 1 by inclining different angles to the X-axis respectively. On the other hand, the turning scroll side guides 11, 15, and 19 are provided to the turning scroll 4 in the condition orthogonal to the casing side guides 10, 14, and 18. And sliders 12, 16, and 20 are provided between the casing side guides 10, 14, and 18, and the turning scroll side guides 11, 15, and 19. As a result, the sliders 12, 16, and 20 are sliding displaced in the directions of orthogonal two shafts, following to the turning operation of the turning scroll 4, and they are guided at the different angles to the X-axis and the Y-axis respectively.

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 oilless scroll type fluid machine.

[0002]

2. Description of the Related Art Generally, among scroll type fluid machines,
A casing, a fixed scroll provided in the casing, a drive shaft rotatably provided in the casing, and a plurality of compression chambers provided rotatably provided at a tip end side of the drive shaft, between the fixed scroll. And a rotation preventing mechanism for preventing the rotation of the orbiting scroll from rotating.

In this type of scroll fluid machine according to the related art, the orbiting scroll is rotationally driven from the outside with a fixed eccentric dimension relative to the fixed scroll by driving the drive shaft from the outside, so that the orbiting scroll is 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 compressed from the discharge port provided at the center of the fixed scroll. The fluid is discharged to the outside.

Further, as such a conventional scroll type fluid machine, there is known a scroll type fluid machine in which an Oldham coupling comprising a slider and a guide is used as a rotation preventing mechanism (for example, Japanese Patent Application Laid-Open No. 8-319966). In the case of this kind of anti-rotation mechanism using an Oldham coupling, a first guide is provided on the casing side, a second guide is provided on the back side of the orbiting scroll, and a slider is disposed between the first and second guides. It is configured to be installed. Then, when the orbiting scroll orbits, the slider moves to the first or first position.
The second guide is slid and displaced while being guided in two axial directions perpendicular to each other, thereby preventing the orbiting scroll from rotating.

[0005]

In the above-described scroll type fluid machine according to the prior art, since the drive shaft is surrounded by one slider, the rotation preventing mechanism using the slider or the like is likely to be large in size. This tends to increase the size of the slider, which increases the inertial force of the slider, thereby causing a problem that noise and vibration are likely to occur. Also, with the increase in size of the slider,
Since the contact surface pressure between the second guide and the slider increases,
The slider and the like are easily worn and damaged. Further, in the prior art, since the slider is increased in size, when the slider is formed of a resin material, there is a problem that the slider is easily deformed such as warpage, and the productivity is reduced.

On the other hand, in the scroll type fluid machine according to the prior art, one slider is provided between the first and second guides. In the scroll type fluid machine according to the related art, the rotation torque acting on the orbiting scroll is transmitted to the slider through the second guide, and is received by the first guide through the slider.

For this reason, when the rotation torque of the orbiting scroll acts, for example, in a direction parallel to the first guide,
The rotation torque cannot be received by the first guide. As a result, the orbiting scroll may be largely displaced along the first guide. Similarly, when the rotation torque of the orbiting scroll acts in a direction parallel to the second guide, the rotation torque cannot be received by the slider, so that the orbiting scroll is largely displaced along the second guide. Sometimes. As described above, the scroll type fluid machine according to the related art has a problem that the behavior of the orbiting scroll becomes unstable.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention can improve the durability of a slider or the like by downsizing, and always receives the rotation torque of the orbiting scroll to behave. It is an object of the present invention to provide a scroll-type fluid machine capable of stabilizing the pressure.

[0009]

In order to solve the above-mentioned problems, the present invention provides a casing, a fixed scroll provided on the casing, a drive shaft rotatably provided on the casing, and a drive shaft provided on the casing. The orbiting scroll is provided at the distal end of the orbiting scroll, and defines a plurality of compression chambers between the fixed scroll and the rotating scroll. The present invention is applied to a scroll-type fluid machine including a plurality of rotation preventing mechanisms provided to perform the above operation.

A feature of the structure adopted by the invention of claim 1 is that each of the rotation preventing mechanisms includes a casing-side guide provided on the casing side and a orbiting scroll side provided on the back side of the orbiting scroll. A guide, and a slider provided between the casing side guide and the orbiting scroll side guide and guided in two axial directions orthogonal to each other. It is located around the axis.

With this configuration, the plurality of rotation preventing mechanisms regulate the rotation of the orbiting scroll when the orbiting scroll performs the orbiting operation, and perform only the revolution.
At this time, since the rotation torque of the orbiting scroll is received by the plurality of rotation preventing mechanisms, the contact surface pressure between the casing-side guide and the orbiting scroll-side guide of each rotation preventing mechanism and the slider decreases.

Further, the invention of claim 2 is that the respective rotation preventing mechanisms are arranged at mutually different angles with respect to two axes orthogonal to the axis of the drive shaft.

Thus, the plurality of rotation preventing mechanisms prevent the orbiting scroll from rotating when the orbiting scroll orbits. When the rotation torque of the orbiting scroll acts in parallel with the casing side guide and the orbiting scroll side guide of one of the plurality of rotation prevention mechanisms, the one rotation prevention mechanism rotates the rotation torque of the orbiting scroll. Will not be able to accept. At this time, the other anti-rotation mechanisms are arranged at an angle different from that of one anti-rotation mechanism with respect to two axes orthogonal to the axis.
The slider of the other rotation preventing mechanism is guided at a different angle from the slider of the one rotation preventing mechanism. Therefore, the rotation torque of the orbiting scroll can be received by the slider of the other rotation preventing mechanism, the casing side guide, and the orbiting scroll side guide.

Further, the invention according to claim 3 is that three of said rotation preventing mechanisms are arranged at intervals of 120 ° with respect to the axis center of the drive shaft.

Thus, the rotation torque of the orbiting scroll can be almost uniformly received by the three rotation preventing mechanisms, and the rotation of the orbiting scroll can be restricted so that only the revolution can be performed.

According to a fourth aspect of the present invention, a thrust load supporting mechanism for supporting a thrust load acting on the orbiting scroll is provided between the casing and the rear surface of the orbiting scroll at a position different from each of the rotation preventing mechanisms. That is.

Thus, the thrust load acting on the orbiting scroll can be supported by the thrust load supporting mechanism, and the thrust load can be prevented from acting on the slider of each rotation preventing mechanism. Therefore, the slider can be smoothly slid and displaced. it can.

According to a fifth aspect of the present invention, the slider of each of the rotation preventing mechanisms is provided with a sphere receiving hole, and the sphere can be rolled between the rear surface of the orbiting scroll and the casing in the sphere receiving hole. Is provided.

Accordingly, the thrust load acting on the orbiting scroll can be received by the sphere accommodated in the sphere accommodation hole of the slider, and the slider can be smoothly slid and displaced.

Further, in the invention according to claim 6, the casing-side guide of each of the rotation preventing mechanisms is a casing-side guide groove provided in the casing, and the orbiting scroll-side guide is provided in the orbiting scroll. A groove facing the casing side guide groove and the orbiting scroll side guide groove are provided on the front surface and the back surface of the slider, respectively. A gap between the casing side guide groove and the front surface groove of the slider is provided. A spherical body is provided, and a spherical body is provided between the orbiting scroll side guide groove and the groove on the back surface side of the slider.

Thus, the slider of each rotation preventing mechanism is guided in one axial direction by a sphere provided between the guide groove on the casing side and the groove on the front side of the slider. It is guided in another axial direction perpendicular to one axial direction by a sphere provided between the groove on the back side. For this reason, the slider is guided in two axial directions orthogonal to each other, and the rotation of the orbiting scroll can be restricted.

A slider and a guide groove on the casing side;
Since the thrust load of the orbiting scroll can be received by the sphere provided between the orbiting scroll side guide groove, the slider can be smoothly displaced.

[0023]

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.

First, a scroll type air compressor according to a first embodiment of the present invention will be described with reference to FIGS.

In the drawing, reference numeral 1 denotes a bottomed cylindrical casing which forms an outer frame of a scroll type air compressor. The casing 1 has an annular bottom 1A and a fixed scroll 2 which will be described later from the outer peripheral side of the bottom 1A. 1B extending toward the side
And a bearing 1C protruding from the inner periphery of the bottom 1A.

Further, the cylindrical portion 1B of the casing 1 is provided with a plurality of cooling air inlets 1D for allowing cooling air from a cooling fan (not shown) to flow into the casing 1. On the other hand, a plurality of cooling air outlets 1E are provided at the bottom 1A of the casing 1 to allow the cooling air flowing from the cooling air inlet 1D to flow out.

Reference numeral 2 denotes a fixed scroll fixed to the tip end of the casing 1. The fixed scroll 2 is formed in a substantially disk shape as shown in FIG.
A head plate 2A disposed so as to coincide with 1-O1, a spiral wrap portion 2B erected on the surface of the head plate 2A,
A cylindrical portion 2C that protrudes in the axial direction so as to surround the wrap portion 2B from the outer peripheral side of the end plate 2A, and a radially outwardly protrudes from the outer peripheral side of the cylindrical portion 2C and is attached to the opening end of the cylindrical portion 1B of the casing 1. And a flange portion 2D.

Reference numeral 3 denotes a drive shaft rotatably supported in a bearing 1C of the casing 1. The drive shaft 3 has a base end connected to a drive source (not shown) such as an electric motor and a distal end. The side serves as a crank 3 </ b> A and extends into the casing 1.
The crank 3A of the drive shaft 3 has its axis O2-
O2 is eccentric with respect to the axis O1-O1 of the drive shaft 3 by a dimension δ.

Reference numeral 4 denotes a revolving scroll which is rotatably provided in the casing 1 so as to face the fixed scroll 2. The revolving scroll 4 comprises a mirror plate 4A formed in a disk shape as shown in FIG. The wrap portion 4B is erected in the axial direction from the surface side of 4A, and the center side is the inner end and the outer peripheral side is the outer end. The end plate 4A of the orbiting scroll 4 is provided with a boss 4C at the center on the back side thereof.
Is rotatably attached to the crank 3A. Also,
Radiation fins 4D are radially provided on the boss 4C of the orbiting scroll 4.

Here, the orbiting scroll 4 is disposed so as to overlap with the wrap portion 2B of the fixed scroll 2 by being shifted by, for example, 180 degrees.
A plurality of compression chambers 6, 6, ... are defined between B. During the operation of the scroll type air compressor, air is sucked into the compression chamber 6 from the suction port 7 provided on the outer peripheral side of the fixed scroll 2, and the air is sucked into the compression chamber 6 while the orbiting scroll 4 orbits. Then, compressed air is finally discharged from the compression chamber 6 on the center side to the outside through a discharge port 8 provided at the center of the fixed scroll 2.

Reference numeral 9 denotes a first anti-rotation mechanism for restricting the rotation of the orbiting scroll 4 and performing only revolving. The first anti-rotation mechanism 9 is disposed, for example, at the upper left position in FIG. The casing-side guide 10, the orbiting scroll-side guide 11, and the slider 12 constitute an Oldham coupling.

The first anti-rotation mechanism 9, together with the second and third anti-rotation mechanisms 13 and 17 to be described below,
And these anti-rotation mechanisms 9, 13, 17 are approximately 120 ° with respect to the axis center of the drive shaft 3 (axis O1-O1).
They are arranged on the same circumference at intervals.

Reference numerals 10 and 10 denote first casing-side guides provided on the bottom 1A of the casing 1, and the casing-side guides 10 are formed in an elongated rectangular column shape. here,
As the two axes orthogonal to the axis O1-O1 of the drive shaft 3, the axis of the drive shaft 3 and the center of the third anti-rotation mechanism 17 are connected, and the axis extending upward and downward in FIG. An axis that passes through the center of the axis and is orthogonal to the Y axis and extends in the left and right directions in FIG. At this time, the casing side guide 10 is
As shown in FIG. 3, it extends in the direction of arrow A inclined at an angle .theta.A in the counterclockwise direction with respect to the X1 axis parallel to the X axis. The two casing-side guides 10 sandwich the slider 12, and the inner surfaces thereof are in sliding contact with the slider 12. For this reason, the casing side guide 10 compensates for the relative displacement of the slider 12 with respect to the casing 1 in the direction of arrow A, and regulates the relative displacement in the direction of arrow A 'orthogonal to the direction of arrow A. ing.

Reference numerals 11 and 11 denote end plates 4A of the orbiting scroll 4.
A first orbiting scroll-side guide provided on the back surface, the orbiting scroll-side guide 11 is formed in an elongated rectangular column shape, and extends in a direction orthogonal to the casing-side guide 10 in a direction indicated by an arrow A 'in FIG. ing. Therefore, the orbiting scroll side guide 11 is inclined by an angle θA with respect to the Y1 axis parallel to the Y axis as shown in FIG. And 2
The orbiting scroll-side guides 11 sandwich the slider 12, and the inner peripheral surface thereof is in sliding contact with the slider 12. Therefore, the orbiting scroll side guide 11 compensates for the relative displacement of the slider 12 with respect to the orbiting scroll 4 in the direction of arrow A ', and regulates the relative displacement in the direction of arrow A.

Reference numeral 12 denotes a first slider provided inside the first casing side guide 10 and the first orbiting scroll side guide 11, and the slider 12 is made of a metal material or a resin having wear resistance. It is formed in a substantially square plate shape by a material or the like. The outer surface of the slider 12 is in sliding contact with the casing-side guide 10 and the orbiting scroll-side guide 11, and is guided with respect to the casing 1 at an angle θA between the casing 1 and the X1 axis.
Are guided at an angle .theta.A with respect to the Y1 axis.
As a result, the slider 12 is guided in directions indicated by arrows A and A 'orthogonal to each other.

Reference numeral 13 denotes a second anti-rotation mechanism. The second anti-rotation mechanism 13 is disposed, for example, at the upper right position in FIG. 16.

Reference numerals 14 and 14 denote second casing-side guides provided on the bottom 1A of the casing 1, and the casing-side guides 14 are formed in an elongated prismatic shape. And
As shown in FIG.
It extends in the direction of arrow B inclined at an angle .theta.B smaller than the angle .theta.A in a counterclockwise direction with respect to the X2 axis parallel to the axis. For this reason, the second casing side guide 14
Is inclined clockwise with respect to the first casing side guide 10 by an angle α1. The two casing side guides 14 sandwich the slider 16, and the inner surfaces thereof are in sliding contact with the slider 16. For this reason, the casing side guide 14 compensates for the relative displacement of the slider 16 with respect to the casing 1 in the direction of arrow B, and restricts the relative displacement in the direction of arrow B 'orthogonal to the direction of arrow B. ing.

Reference numerals 15 and 15 denote end plates 4A of the orbiting scroll 4.
A second orbiting scroll-side guide provided on the back surface, the orbiting scroll-side guide 15 is formed in an elongated rectangular column shape, and is orthogonal to the casing-side guide 14. For this reason, as shown in FIG. 3, the second orbiting scroll side guide 15 is inclined by an angle .theta.B with respect to the Y2 axis parallel to the Y axis and extends in the direction of arrow A '. And extends along the direction indicated by arrow B '.

Then, two orbiting scroll side guides 1
5 has a slider 16 interposed therebetween, and its inner peripheral surface is
Is in sliding contact with For this reason, the orbiting scroll side guide 1
Numeral 5 compensates for relative displacement of the slider 16 with respect to the orbiting scroll 4 in the direction of arrow B ', and regulates relative displacement in the direction of arrow B.

A second slider 16 is provided inside the second casing-side guide 14 and the second orbiting scroll-side guide 15. The second slider 16 is substantially the same as the first slider 12. It is formed in a substantially square flat plate shape. The outer surface of the slider 16 is in sliding contact with the casing side guide 14 and the orbiting scroll side guide 15, and is guided with respect to the casing 1 at an angle .theta.B between the X2 axis and the Y2 with respect to the orbiting scroll 4.
It is guided at an angle θB between the shafts. This allows
The slider 16 has an arrow B direction and an arrow B ′ orthogonal to each other.
It is guided in the direction.

Reference numeral 17 denotes a third anti-rotation mechanism. The third anti-rotation mechanism 17 is disposed, for example, at a position below the center in FIG. It is constituted by a slider 20.

Reference numerals 18 designate a third casing-side guide provided on the bottom 1A of the casing 1, and the casing-side guide 18 is formed in an elongated rectangular column shape. And
As shown in FIG.
Angle θA in the counterclockwise direction with respect to the X3 axis parallel to the axis,
It extends along an arrow C direction inclined by an angle θC smaller than θB. Therefore, the third casing-side guide 18 is inclined clockwise with respect to the first casing-side guide 10 by an angle α2. The angle α2 is set to, for example, about twice the angle α1. For this reason, the third casing-side guide 18 is inclined clockwise with respect to the second casing-side guide 14 by approximately the angle α1.

Also, the two casing side guides 18
The slider 20 has the inner side surface in sliding contact with the slider 20. For this reason, the casing side guide 18 compensates for the relative displacement of the slider 20 with respect to the casing 1 in the direction of arrow C, and regulates the relative displacement in the direction of arrow C 'orthogonal to the direction of arrow C. ing.

Reference numerals 19, 19 denote end plates 4A of the orbiting scroll 4.
A third orbiting scroll side guide 19 provided on the back surface, the orbiting scroll side guide 19 is formed in an elongated rectangular column shape, and is orthogonal to the casing side guide 18. For this reason, as shown in FIG. 3, the third orbiting scroll side guide 19 is inclined by an angle .theta.c with respect to the Y3 axis parallel to the Y axis and extends in the direction of arrow A '. The second orbiting scroll side guide 15 extends in the direction indicated by arrow B 'and extends in the direction indicated by arrow C'.

Then, two orbiting scroll side guides 1
9 sandwiches the slider 20 and has an inner peripheral surface
Is in sliding contact with For this reason, the orbiting scroll side guide 1
Numeral 9 compensates for relative displacement of the slider 20 in the direction of arrow C 'with respect to the orbiting scroll 4, and restricts relative displacement in the direction of arrow C.

Reference numeral 20 denotes a third slider provided inside the third casing side guide 18 and the second orbiting scroll side guide 19, and the slider 20 includes the first and second sliders 12, It is formed in a substantially square flat plate shape in substantially the same manner as 16. The outer surface of the slider 20 is in sliding contact with the casing side guide 18 and the orbiting scroll side guide 19, and is guided with respect to the casing 1 at an angle θC between the X1 axis and the orbiting scroll 4 with Y3. It is guided at an angle θC between the shaft and the shaft. Thus, the slider 20 is guided in the directions indicated by arrows C and C 'which are orthogonal to each other.

Are the bottom 1A of the casing 1.
And three thrust load supporting mechanisms provided between the rotating scroll 4 and the rear surface of the end plate 4A of the orbiting scroll 4. Each of the thrust load supporting mechanisms 21 includes first, second, and third rotation preventing mechanisms 9, 1.
The first and second and third rotation preventing mechanisms 9, 13 and 17 are provided at substantially different positions from the first and second rotation preventing mechanisms 9 and 13.
The thrust load support mechanism 21 includes a cylindrical sphere housing case 21A and a sphere 21B housed in the sphere housing case 21A. Then, the thrust load supporting mechanism 21 supports the thrust load acting on the orbiting scroll 4 by each of the spheres 21B by the respective spheres 21B rollingly contacting the bottom 1A of the casing 1 and the end plate 4A of the orbiting scroll 4. ing.

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 the electric motor, the orbiting scroll 4 performs a circular motion (orbiting motion) having a turning radius of the dimension δ around the drive shaft 3, and the wrap portion 2 B of the fixed scroll 2. The compression chambers 6, 6,... Defined between the and the wrap portion 4B of the orbiting scroll 4 are continuously reduced. Thereby, the suction port 7 of the fixed scroll 2
The compressed air is stored in an external air tank or the like from the discharge port 8 of the fixed scroll 2 while sequentially compressing the outside air sucked from the compressor in each of the compression chambers 6.

Next, the operation of the first, second, and third rotation preventing mechanisms 9, 13, 17 will be described.

First, when the drive shaft 3 rotates, the first slider 12 comes into sliding contact with the first casing side guide 10. Thereby, the slider 12 is slidably displaced in the direction of arrow A with respect to the casing 1 while being restricted from sliding in the direction of arrow A 'in FIG.

The first slider 12 slides on the first orbiting scroll side guide 11. Thus, the slider 12 moves the orbiting scroll 4 with respect to the arrow A in FIG.
The sliding displacement in the direction indicated by arrow A 'is performed while the sliding displacement in the direction is regulated.

Similarly, the second slider 16 is in sliding contact with the second casing side guide 14, and the sliding displacement in the direction of arrow B 'in FIG. Sliding displacement in the direction. Also, the second slider 16
The sliding scroll 4 comes into sliding contact with the second orbiting scroll side guide 15 in the direction of the arrow B 'while the sliding displacement of the orbiting scroll 4 in the direction of the arrow B in FIG.

Further, the third slider 20 is in sliding contact with the third casing side guide 18, and the sliding displacement of the third slider 20 in the direction of arrow C 'in FIG. Sliding displacement. Also, the third slider 20
The third orbiting scroll 4 is slidably contacted with the third orbiting scroll side guide 19 in the direction of arrow C 'while the sliding displacement of the orbiting scroll 4 in the direction of arrow C in FIG.

As a result, the rotation torque of the orbiting scroll 4 rotated by the drive shaft 3 is reduced by the casing side guide 1.
0, 14, 18, orbiting scroll side guides 11, 15,
19 and the sliders 12, 16, and 20 are received.
As a result, the rotation of the orbiting scroll 4 is restricted, and the orbiting scroll 4 orbits with an orbiting radius having the dimension δ.

The rotation torque of the orbiting scroll 4 is, for example, parallel to the first casing side guide 10 (see FIG. 2).
When acting in the direction indicated by the arrow A in the middle), the rotation torque cannot be received by the first casing-side guide 10. For this reason, the orbiting scroll 4 tends to be largely displaced along the arrow A direction.

At this time, the second casing side guide 14
Is inclined with respect to the X2 axis by an angle θB different from the angle θA of the first casing side guide 10 as shown in FIG. 3, so that the second slider 16 and the second casing side guide 14 The rotation torque of the orbiting scroll 4 can be received between them.

Similarly, the rotation torque of the orbiting scroll 4 can be received between the third slider 20 and the third casing-side guide 18 inclined by the angle θC with respect to the X3 axis. It is possible to prevent the orbiting scroll 4 from being largely displaced along the arrow A direction.

When the rotation torque of the orbiting scroll 4 acts in a direction parallel to the first orbiting scroll side guide 11 (in the direction indicated by the arrow A 'in FIG. 2), the first orbiting scroll side guide 11 moves to the first position. Since the rotation torque cannot be transmitted to the first slider 12, the orbiting scroll 4 tends to be largely displaced in the direction of arrow A '.

However, the second and third orbiting scroll side guides 15 and 19 are inclined with respect to the Y2 and Y3 axes by angles θB and θC different from the angle θA of the first orbiting scroll side guide 11. Therefore, the rotation torque of the orbiting scroll 4 acting in the direction of the arrow A 'can be received by the second and third casing side guides 14 and 18 through the second and third sliders 16 and 20. It is possible to prevent the orbiting scroll 4 from being largely displaced along the arrow A 'direction.

Similarly, when the rotation torque of the orbiting scroll 4 acts in the directions indicated by arrows B and B ',
The third rotation prevention mechanisms 9 and 17 can receive the rotation torque of the orbiting scroll. When the rotation torque of the orbiting scroll 4 acts in the directions indicated by arrows C and C ', the first and second rotation preventing mechanisms 9 and 13 can receive the rotation torque of the orbiting scroll. Thereby, the rotation torque of the orbiting scroll 4 can be always received, and the behavior of the orbiting scroll 4 can be stabilized.

Thus, according to the present embodiment, since the three anti-rotation mechanisms 9, 13, 17 are provided between the casing 1 and the orbiting scroll 4, the three anti-rotation mechanisms 9, 13, 17 are provided. Thus, the rotation torque of the orbiting scroll 4 can be received. Thereby, compared with the case where one rotation prevention mechanism is used as in the prior art, the rotation prevention mechanisms 9 and 1 are used.
It is possible to reduce the rotation torque acting on each of the three and the three. For this reason, the surface pressure acting on the sliders 12, 16, 20 and the like can be reduced, and the amount of wear can be reduced, so that the durability of the sliders 12, 16, 20 and the like can be improved.

The three anti-rotation mechanisms 9, 13, 17
As a result, the anti-rotation mechanisms 9, 13, 17 by the sliders 12, 16, 20, etc. are downsized compared to a configuration in which the slider surrounds the drive shaft 3 as in the prior art. can do. For this reason,
The inertia of the sliders 12, 16, and 20 can be reduced, and noise due to the inertia of the sliders 12, 16, and 20 can be reduced.
Vibration and the like can be suppressed. The slider 12,
Since the size of the sliders 16, 20 is reduced, the sliders 12, 16, 2
Even when 0 is formed of a resin material, deformation such as warpage of the sliders 12, 16, and 20 hardly occurs,
Productivity can be improved.

The first, second, and third rotation preventing mechanisms 9, 13, and 17 are at different angles θA, θB, and θC with respect to the X axis and the Y axis orthogonal to the axis O1-O1 of the drive shaft 3.
, The first, second, and third sliders 12, 1
6, 20 are different angles θA with respect to the X axis and the Y axis,
Guided by θB and θC. Therefore, even when one of the three rotation preventing mechanisms 9, 13, 17 cannot receive the rotation torque of the orbiting scroll 4, the other two rotation preventing mechanisms rotate. The rotation torque of the scroll 4 can be received. Thereby, the behavior of the orbiting scroll 4 can be stabilized, and the occurrence of vibration, noise, and the like that occur when the behavior of the orbiting scroll 4 becomes unstable is prevented, and a low-vibration, low-noise scroll-type air compressor is provided. Can be realized.

The three anti-rotation mechanisms 9, 13, 1
Since the rotating shafts 7 are arranged at intervals of 120 ° with respect to the center of the driving shaft 3, the rotation preventing mechanisms 9, 13, 17 can receive the rotation torque of the orbiting scroll 4 almost uniformly. Further, since the respective rotation preventing mechanisms 9, 13, 17 are provided separately and independently, a large cooling fin 4D extending between the rotation preventing mechanisms 9, 13, 17 is provided around the boss 4C of the orbiting scroll 4. Thus, the cooling efficiency of the slewing bearing 5 and the like can be improved.

Further, since the thrust load supporting mechanism 21 is provided between the casing 1 and the orbiting scroll 4 at a position different from the rotation preventing mechanisms 9, 13 and 17, the sliders 12 and 13 of the rotation preventing mechanisms 9, 13 and 17 are provided. No thrust load acts on the sliders 16, 16, 20
Can be smoothly slid and displaced, and power loss can be reduced.

Further, the rotation torque of the orbiting scroll 4 is reduced by the first, second and third casing side guides 10, 14, 1
8 and the like, the sliders 12, 16 and 2 are compared with the case where the thrust load support mechanism 21 is not provided.
0 tends to cause a larger sliding displacement. However, in the present embodiment, the rotation torque of the orbiting scroll 4 is the first or the first.
When acting in parallel with a guide at any position such as the second and third casing side guides 10, 14, 18, etc., the rotation torque of the orbiting scroll 4 can be received by other guides. The behavior of the orbiting scroll 4 can be stabilized while reducing it.

FIGS. 4 and 5 show a second embodiment of the present invention. The feature of this embodiment is that a slider is provided with a sphere receiving hole penetrating in the thrust direction, and the inside of the sphere receiving hole is provided. In which a sphere rolling between the casing and the orbiting scroll is accommodated. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals,
The description is omitted.

Reference numeral 31 denotes a first rotation prevention mechanism according to the present embodiment. The first rotation prevention mechanism 31 includes a first casing side guide 10, a first orbiting scroll side guide 11, and a first It is constituted by a slider 32.

Reference numeral 32 denotes a first slider.
Is formed in a substantially square plate shape in substantially the same manner as the slider 12 according to the first embodiment, but has a sphere accommodation hole 32A that penetrates in the thrust direction in the center thereof and accommodates a sphere 37 described later. This is different from the slider 12 according to the first embodiment in that

Reference numeral 33 denotes a second anti-rotation mechanism according to the present embodiment. The second anti-rotation mechanism 33 includes a second casing-side guide 14, a second orbiting scroll-side guide 15, and a first slider 32. Second slider 3 almost similar to
4. Then, the second slider 3
4 also has a spherical housing hole 34A penetrating in the thrust direction.

Reference numeral 35 denotes a third anti-rotation mechanism according to the present embodiment. The third anti-rotation mechanism 35 includes a third casing-side guide 18, a third orbiting scroll-side guide 19, and first and second rotation guides. Third sliders substantially similar to the sliders 32 and 34 of FIG.
Of the slider 36. And the third
The slider 36 also has a spherical housing hole 36A penetrating in the thrust direction.

, 37,... Are the spherical housing holes 32A, 3
4A and 36A together with the sphere constituting the thrust load supporting mechanism, each sphere 37 is provided with each sphere accommodation hole 32A, 34A, 3A.
6A, and is rotatably provided between the rear surface of the end plate 4A of the orbiting scroll 4 and the bottom 1A of the casing 1.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained. In the present embodiment, in particular, in the present embodiment, the sliders 32, 34, and 36 are provided. Have spherical housing holes 32A, 34A, 3
6A, and the thrust load supporting mechanism is configured by accommodating the spherical body 37 in the spherical body accommodating holes 32A, 34A, 36A, so that the thrust load supporting mechanism can be integrated with the rotation preventing mechanisms 31, 33, 35. it can. Therefore, as in the first embodiment, the anti-rotation mechanisms 9, 13,
17, the area of the bottom 1 </ b> A of the casing 1 can be reduced as compared with the case where the thrust load supporting mechanism 21 is provided independently of the scroll 17, and the scroll-type air compressor can be downsized.

Further, since it is not necessary to secure a space for the thrust load support mechanism only at the bottom 1A of the casing 1, the area of the cooling air outlet 1E can be increased. Thereby, the cooling efficiency of the slewing bearing 5 and the like can be improved.

FIGS. 6 to 9 show a third embodiment of the present invention. The feature of this embodiment is that the casing and the orbiting scroll are provided with grooves serving as guides.
The slider has a sphere rolling along the groove. Note that, in the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 41 denotes a first anti-rotation mechanism according to the present embodiment. The first anti-rotation mechanism 41 comprises a later-described casing-side support plate 42, orbiting scroll-side support plate 43, and slider 44. . The first anti-rotation mechanism 41 surrounds the drive shaft 3 together with second and third anti-rotation mechanisms 45 and 49, which will be described later, and the anti-rotation mechanisms 41, 45 and 49 are spaced apart at substantially equal intervals. ing.

Reference numeral 42 denotes a first casing-side support plate provided on the bottom 1A of the casing 1, and the casing-side support plate 42 is formed in a substantially disk shape. As shown in FIG. 8, the casing side support plate 42 is provided with a first casing side guide groove 42A extending in the direction of arrow D inclined at an angle .theta.D with respect to the X1 axis.

Reference numeral 43 denotes a first orbiting scroll side support plate provided on the back surface of the end plate 4A of the orbiting scroll 4, and the orbiting scroll side support plate 43 is formed in a substantially disk shape. The orbiting scroll-side support plate 43 is provided with a first orbiting scroll-side guide groove 43A extending in the direction indicated by arrow D 'orthogonally to the casing-side guide groove 42A.

Reference numeral 44 denotes a first slider sandwiched between the casing-side support plate 42 and the orbiting scroll-side support plate 43. The slider 44 is formed in a substantially disk shape as shown in FIG. A sphere housing groove 44A is provided on the front side and extends in the direction of arrow D facing the casing side guide groove 42A, and a sphere housing is provided on the back side and extends in the direction of arrow D 'facing the orbiting scroll side guide groove 43A. A groove 44B is provided. Therefore, the sphere receiving grooves 44A and 44B are orthogonal to each other. The two spheres 44 rolling between the sphere housing groove 44A and the casing-side guide groove 42A are provided.
C is housed. Two spheres 44D that roll between the orbiting scroll-side guide groove 43A are accommodated in the sphere accommodation groove 44B.

Reference numeral 45 denotes a second rotation preventing mechanism according to the present embodiment. The second rotation preventing mechanism 45 includes a second casing side support plate 46, a second orbiting scroll side support plate 47, and a second rotation prevention mechanism. It is constituted by a slider 48. The second casing-side support plate 46 is provided on the casing 1 and is formed in a substantially disk-like shape, similarly to the first casing-side support plate 42. Also, the casing side support plate 4
8, a second casing-side guide groove 46A is provided which is inclined with respect to the X2 axis by an angle θE different from the angle θD and extends in the direction of arrow E.

On the other hand, the second orbiting scroll side support plate 47
Is provided on the orbiting scroll 4 and is formed in a disk shape substantially like the first orbiting scroll side support plate 43.
The orbiting scroll side support plate 47 is provided with a second orbiting scroll side guide groove 47A extending in a direction indicated by an arrow E 'orthogonal to the direction indicated by the arrow E.

A substantially disk-shaped slider 48 is provided between the casing-side support plate 46 and the orbiting scroll-side support plate 47.
A spherical housing groove 48A facing the casing side guide groove 46A is provided on the front side of the slider 48, and the orbiting scroll side guide groove 47 is provided on the back side.
A spherical housing groove 48B facing A is provided. The two spheres 48C and 48D that roll between the casing-side guide groove 46A and the orbiting scroll-side guide groove 47A are housed in the sphere housing grooves 48A and 48B, respectively.

Reference numeral 49 denotes a third anti-rotation mechanism according to the present embodiment. The third anti-rotation mechanism 49 includes a third casing-side support plate 50, a third orbiting scroll-side support plate 51, and a third It is constituted by a slider 52. Further, the third casing-side support plate 50 is provided in the casing 1, and is provided with a third casing-side guide groove 50A extending in a direction indicated by an arrow F in FIG. The casing-side guide groove 50A is inclined at an angle θF different from the angles θD and θE with respect to the X3 axis as shown in FIG. The third orbiting scroll side support plate 51 is provided on the orbiting scroll 4 and extends in the direction indicated by an arrow F ′ orthogonal to the direction indicated by the arrow F.
A is provided.

A third slider 52 is disposed between the casing-side support plate 50 and the orbiting scroll-side support plate 51, and a spherical housing facing the casing-side guide groove 50A is provided on the surface of the slider 52. A groove 52A is provided,
On the back side, a spherical housing groove 52B facing the orbiting scroll side guide groove 51A is provided. Also, the casing-side guide grooves 50 are provided in the spherical housing grooves 52A and 52B.
A, two spheres 52C and 52D that roll between the orbiting scroll-side guide groove 51A are accommodated two each.

Thus, in the present embodiment configured as described above, substantially the same operation and effect as those of the first embodiment can be obtained. In particular, in the present embodiment, the casing 1 is provided on the casing side. Guide grooves 42A, 46A, 50
A, and the orbiting scroll 4 is provided with orbiting scroll side guide grooves 43A, 47A and 51A, and the sliders 44 and 4 are provided.
The spheres 44C, 44D, 48C, 48D, 5
2C, 52D, the sliders 44, 48, 52
Are the guide grooves 42A, 43A, 46A, 47A, 50A,
The orbiting scroll 4 can be prevented from rotating in two axial directions orthogonal to each other along the direction 51A. And sphere 4
4C, 44D, 48C, 48D, 52C, 52D are guide grooves 42A, 43A, 46A, 47A, 50A, 51A.
, The rotation of the orbiting scroll 4 is prevented from rotating, so that the sliding resistance caused by the displacement of the sliders 44, 48, 52 can be reduced, and the power efficiency can be improved. Also, the spherical body 44 provided on the sliders 44, 48, 52
Since the thrust load of the orbiting scroll 4 can be received by C, 44D, 48C, 48D, 52C, 52D, the slider 44 can be displaced smoothly.

In each of the above embodiments, the casing 1
And three orbiting prevention mechanisms 9 between the orbiting scroll 4 and
13, 17, 31, 33, 35, 41, 45, 49 are provided, but the present invention is not limited to this, and two rotation preventing mechanisms are provided between the casing 1 and the orbiting scroll 4. And four or more anti-rotation mechanisms may be provided.

Further, 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 can be widely applied to, for example, a vacuum pump, a refrigerant compressor and the like. it can.

[0089]

As described above in detail, according to the first aspect of the present invention, a plurality of anti-rotation mechanisms including a slider and the like are arranged around the drive shaft between the casing and the orbiting scroll. Therefore, the slider can be downsized and the inertia force can be reduced. For this reason, noise, vibration, and the like due to the inertial force of the slider can be reduced, and even when the slider is formed of a resin material, deformation such as warpage of the slider does not easily occur, and productivity can be improved.

According to the second aspect of the present invention, since each of the rotation preventing mechanisms is disposed at an angle different from each other with respect to two axes orthogonal to the axis of the drive shaft, any one of the plurality of rotation preventing mechanisms is provided. Even when the rotation preventing mechanism cannot receive the rotation torque of the orbiting scroll, the rotation preventing torque of the orbiting scroll can be received by another rotation preventing mechanism, and the behavior of the orbiting scroll can be stabilized.

According to the third aspect of the present invention, the three anti-rotation mechanisms are arranged at intervals of 120 ° with respect to the axis of the drive shaft. The rotation torque can be received, and the durability of each rotation prevention mechanism can be improved.

According to the fourth aspect of the present invention, since the thrust load support mechanism is provided between the casing and the orbiting scroll at a position different from each of the rotation preventing mechanisms, the power loss due to the thrust load acting on the slider. , And the behavior of the orbiting scroll can be stabilized.

According to the fifth aspect of the present invention, since the slider is provided with the sphere receiving hole and the sphere is stored in the sphere receiving hole, it is not necessary to separately provide a thrust load supporting mechanism, and the scroll is not required. The size of the air compressor can be reduced.

According to the sixth aspect of the present invention, the casing is provided with a casing-side guide groove, and the orbiting scroll is provided with a orbiting scroll-side guide groove.
On the back surface, grooves facing the casing-side guide groove and the orbiting scroll-side guide groove are provided, and a sphere is provided between the casing-side guide groove and the front surface groove of the slider, and the orbiting scroll-side guide groove and the slider are provided. The slider is displaced in two orthogonal directions along each guide groove, so that the orbiting scroll can be prevented from rotating. Then, since the sphere rolls along the guide groove to prevent the orbiting scroll from rotating, the sliding resistance caused by the displacement of the slider can be reduced, and the power efficiency can be improved. Further, since the thrust load of the orbiting scroll can be received by the sphere provided on the slider, the slider can be displaced smoothly.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view as seen from the direction of arrows II-II in FIG.

FIG. 3 is an explanatory diagram showing an arrangement relationship between first, second, and third rotation preventing mechanisms and a drive shaft according to the first embodiment;

FIG. 4 is a longitudinal sectional view showing a scroll type air compressor according to a second embodiment.

FIG. 5 is a cross-sectional view as viewed from the direction indicated by arrows VV in FIG. 4;

FIG. 6 is a longitudinal sectional view showing a scroll air compressor according to a third embodiment.

FIG. 7 is a cross-sectional view as viewed from the direction of arrows VII-VII in FIG. 6;

FIG. 8 is an explanatory diagram showing an arrangement relationship between first, second, and third rotation preventing mechanisms and a drive shaft according to a third embodiment.

FIG. 9 is an exploded perspective view showing the casing side support plate, the orbiting scroll side support plate, the slider, and the sphere in FIG. 6 in an exploded manner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing 2 Fixed scroll 2B, 4B Wrap part 4 Orbiting scroll 6 Compression chamber 9,31,41 1st anti-rotation mechanism 10 1st casing side guide 11 1st orbiting scroll side guide 12,32,44 1st Slider 13, 33, 45 Second anti-rotation mechanism 14 Second casing-side guide 15 Second orbiting scroll-side guide 16, 34, 48 Second slider 17, 35, 49 Third anti-rotation mechanism 18 Third Casing-side guide 19 Third orbiting scroll-side guide 20, 36, 52 Third slider 21 Thrust load support mechanism 37, 44C, 44D, 48C, 48D, 52C, 52
D Sphere 42A First casing-side guide groove 43A First orbiting scroll-side guide groove 46A Second casing-side guide groove 47A Second orbiting scroll-side guide groove 50A Third casing-side guide groove 51A Third orbiting scroll Side guide groove 44A, 44B, 48A, 48B, 52A, 52B Spherical housing groove

Claims (6)

[Claims] 1. A casing, a fixed scroll provided on the casing, a drive shaft rotatably provided on the casing, and a pivot provided on a tip end side of the drive shaft so as to be rotatable. A orbiting scroll that defines a plurality of compression chambers; and a plurality of anti-rotation mechanisms provided between the casing and the rear surface of the orbiting scroll to restrict the rotation of the orbiting scroll and perform only orbital rotation. In the scroll-type fluid machine, each of the rotation preventing mechanisms includes a casing-side guide provided on the casing side, a orbiting scroll-side guide provided on the back side of the orbiting scroll, and the casing-side guide and the orbiting scroll side. It is provided between the guide and
A scroll-type fluid machine comprising a slider guided in two axial directions orthogonal to each other, wherein each of the rotation preventing mechanisms is arranged around the drive shaft so as to surround the drive shaft. 2. The scroll fluid machine according to claim 1, wherein each of the rotation preventing mechanisms is disposed at an angle different from each other with respect to two axes orthogonal to the axis of the drive shaft. 3. The scroll fluid machine according to claim 1, wherein three of said rotation preventing mechanisms are arranged at 120 ° intervals with respect to the axis center of a drive shaft. 4. A thrust load supporting mechanism for supporting a thrust load acting on the orbiting scroll is provided between the casing and the rear surface of the orbiting scroll at a position different from each of the rotation preventing mechanisms. Or the scroll-type fluid machine according to 3. 5. A slider of each of the rotation preventing mechanisms is provided with a sphere receiving hole, and a sphere that can roll between the rear surface of the orbiting scroll and the casing is provided in the sphere receiving hole. 4. The scroll-type fluid machine according to claim 2, 2 or 3. 6. A casing-side guide of each rotation preventing mechanism is a casing-side guide groove provided in the casing, and the orbiting scroll-side guide is a orbiting scroll-side guide groove provided in the orbiting scroll. Grooves facing the casing-side guide groove and the orbiting scroll-side guide groove are provided on the front and back surfaces of the slider, respectively, and a sphere is provided between the casing-side guide groove and the front surface groove of the slider. 4. The scroll-type fluid machine according to claim 1, wherein a spherical body is provided between the scroll-side guide groove and the groove on the back side of the slider.