JP2000257570A - Scroll type hydraulic machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type hydraulic machine capable of facilitating the design for adjusting dynamic unbalance by a counterweight. SOLUTION: A movable scroll 2 opposes to a fixed scroll 1 in the direction of a predetermined axis. The movable scroll is revolved without rotating by itself with respect to the predetermined axis to transfer fluid in cooperation with the fixed scroll 1. A drive mechanism for giving vevolving force to the movable scroll 2 is connected with one end in the direction of the predetermined axis of the movable scroll 2. A self-rotation prevention mechanism 9' preventing self-rotation of the movable scroll 2 is involved in a set of the fixed scroll 1 and the movable scroll 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll type fluid machine.

[0002]

2. Description of the Related Art Scroll type fluid machines are widely used as compressors in various fields such as air conditioners for vehicles. An example of a conventional scroll type fluid machine will be described with reference to FIG.

The illustrated scroll type fluid machine is suitable for use in an air conditioner for a vehicle, and includes a fixed scroll 1, a movable scroll 2 paired with the fixed scroll 1, a casing 3 including these, and a And a front housing 4 which is fixed to the open end of the casing 3 and is closed. The fixed scroll 1 includes a fixed spiral body 1a and a fixed end plate 1b integrally fixed to one end in the axial direction thereof. The movable scroll 2 includes a movable vortex winding body 2a,
And a movable end plate 2b integrally fixed to one end in the axial direction. The fixed end plate 1b and the movable end plate 2b are opposed to each other in a state where the fixed spiral winding 1a and the movable spiral winding 2a are engaged with each other, and some of them are used to transfer a fluid such as a refrigerant while compressing them. A closed space 5 is formed.

The fixed end plate 1b is fixed to the casing 3 by bolts 6.
And a discharge chamber 7 is formed between the discharge chamber 7 and the casing 3. A discharge port 8 for discharging the fluid compressed in the closed space 5 to the discharge chamber 7 is formed in the fixed end plate 1b.

[0005] A rotation preventing mechanism 9 is provided between the movable end plate 2b and the front housing 4 to oppose each other in the axial direction. Further, an annular projection 2c is integrally formed on the surface of the movable end plate 2b opposite to the movable spirally wound body 2a.
An eccentric bush 11 is rotatably disposed inside the annular protrusion 2c via a bush bearing 12.

The large diameter portion 1 is located at the center of the front housing 4.
A shaft 13 having 3a penetrates. Shaft 13
Are supported by a shaft bearing 14, and the large diameter portion 13 a is supported by a main bearing 15. The large diameter portion 13a of the shaft 13 includes an eccentric pin 16 engaged with the eccentric bush 11. The shaft 13 has a counterweight 17 and a shaft balance weight 1 that oppose the moment when the orbiting scroll 2 operates.
8 are provided on both sides of the large diameter portion 13a. The shaft 13, the eccentric pin 16, and the eccentric bush 11 are
It constitutes a drive mechanism.

[0007] A rotor 21 is rotatably supported outside the cylindrical portion 4 a of the front housing 4 via a radial bearing 19. The rotor 21 is driven to rotate by, for example, an automobile engine. The rotor 21 is connected to the shaft 13 via an electromagnetic clutch 22. Therefore, when the electromagnetic clutch 22 is on, the shaft 13 rotates integrally with the rotor 21, but when the electromagnetic clutch 22 is disconnected, the shaft 13 is separated from the rotor 21.

When the shaft 13 rotates, the eccentric pin 16
And movable scroll 2 by the action of eccentric bush 11.
Revolves in a circular orbit. At this time, the rotation of the orbiting scroll 2 is stopped by the rotation preventing mechanism 9. as a result,
The closed space 5 is transferred to the center while compressing the fluid, and discharges the fluid to the discharge chamber 7 through the discharge port 8. The fluid in the discharge chamber 7 flows out of the discharge port 23 to the refrigeration circuit, returns from the inflow port 24 into the casing 3, and is taken into the closed space 5.

A fixed scroll 1 and a movable scroll 2
Between the casing 3 and the front housing 4
And indirectly through various components between. Therefore, it is necessary to adjust the axial gap. This adjustment is performed by temporarily assembling the scroll-type fluid machine, and referring to the torque of the shaft 13 while referring to the torque of the shaft 13.
And a shim 25 of known thickness between the casing 3 and
Further, the shim 25 is exchanged as necessary.

[0010]

In the scroll type fluid machine shown in FIG. 11, the movable end plate 2b of the movable scroll 2 is provided.
The anti-rotation mechanism 9 is provided between the parts that oppose each other in the axial direction with the front housing 4, and the driving mechanism is connected to the movable end plate 2 b. For this reason, a component that rotates together with the shaft 13 cannot be disposed outside the rotation prevention mechanism 9, that is, on the movable scroll 2 side. For example,
If a design change is made to increase the amount of unbalance of the counterweight 17, the radial direction is limited by the rotation preventing mechanism 9, so that it must be extended in the axial direction. in this case,
The overall length of the scroll-type fluid machine is increased, causing an increase in dynamic imbalance. The axial center of gravity of the movable scroll 2 is
Normally, since the counterweight 17 is located closer to the fixed scroll 1 than the rotation preventing mechanism 9, it is impossible to design the counterweight 17 to reduce the dynamic imbalance to zero.

A fixed scroll 1 and a movable scroll 2
In the method of adjusting the axial gap between the casing 3 and the front housing 4 by using the shim 25 as described above.
The adjustment operation is complicated because it is affected by the dimensions of various components interposed between the two.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a scroll type fluid machine which facilitates a design for adjusting a dynamic imbalance by a counterweight.

Another object of the present invention is to provide a scroll-type fluid machine which can easily set an axial gap between a fixed scroll and a movable scroll.

[0014]

According to the present invention, a fixed scroll is opposed to the fixed scroll in the direction of a predetermined axis, revolves without rotating about the predetermined axis, and cooperates with the fixed scroll to transfer fluid. Movable scroll to transfer,
A scroll-type fluid machine, comprising: a rotation preventing mechanism for preventing rotation of the movable scroll; and a drive mechanism connected to one end of the movable scroll in the direction of the predetermined axis for applying a revolving force to the movable scroll. The scroll type fluid machine is characterized in that the blocking mechanism is included in a set of the fixed scroll and the movable scroll.

[0015] The apparatus may further include position regulating means for directly regulating the axial position of the movable scroll with respect to the fixed scroll.

The rotation preventing mechanism includes a through hole formed in one of the fixed scroll and the movable scroll and extending in parallel with the predetermined axis, and a pin extending in parallel with the predetermined axis from the other and inserted in the through hole. And the through hole and the pin are set to have a diameter that cooperates with each other to prevent the movable scroll from rotating.

The fixed scroll includes a fixed spiral and a fixed end plate integrally fixed to one end of the fixed spiral in the axial direction. The movable scroll includes a movable spiral and a shaft of the movable spiral. A movable end plate integrally fixed to one end in the direction, wherein the fixed end plate and the movable end plate face each other in the direction of the predetermined axis while the fixed spiral body and the movable spiral body are engaged with each other. The through-hole may be formed in one of the fixed end plate and the movable end plate, and the pin may be protruded from the other.

[0018] The pin may have a flange at its distal end for engaging the one of the pins to regulate an axial position of the movable scroll with respect to the fixed scroll.

A counterweight connected to the driving mechanism and opposing a moment of the movable scroll;
The counterweight may extend radially outward of the set of the fixed scroll and the movable scroll from the driving mechanism.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scroll type fluid machine according to a first embodiment of the present invention will be described with reference to FIG. The same parts as those of the scroll type fluid machine of FIG. 11 are denoted by the same reference numerals, and description thereof is omitted.

In the illustrated scroll type fluid machine, the fixed end plate 1b of the fixed scroll 1 has a through hole 31 having a circular cross section.
Are formed. The through hole 31 extends in parallel with a predetermined axis. On the other hand, a cylindrical pin 32 having a cylindrical outer peripheral surface is protruded from an axial end surface of the movable spiral body of the movable scroll 2. The cylindrical pin 32 extends parallel to the predetermined axis and is inserted through the through hole 31. The through hole 31 and the cylindrical pin 32
The movable scrolls 2 are set to have a diameter that cooperates with each other to prevent the movable scroll 2 from rotating. That is, if the turning radius of the movable scroll 2 is R0 and the outer diameter of the cylindrical pin 32 is R1,
The inner diameter R2 of the through hole 31 is R2 = R0 + R1. As a result, the through hole 31 and the cylindrical pin 32 together form a rotation preventing mechanism 9 '. This rotation prevention mechanism 9 ′
This is a structure included in a set of a fixed scroll 1 and a movable scroll 2 (hereinafter, this is referred to as a “scroll set”).

Further, the cylindrical pin 32 has a flange 33 at its tip for restricting the axial position of the movable scroll 2 with respect to the fixed scroll 1 by engaging with the fixed end plate 1b of the fixed scroll 1. Thus, the fixed scroll 1 and the movable scroll 2 are engaged with each other, and the axial position of the movable scroll 2 with respect to the fixed scroll 1 is directly regulated. That is, the flange 33 constitutes a position regulating means.

In this scroll type fluid machine, the eccentric bush 11 is provided with a counterweight 17 having a shape shown in FIG.

Still referring to FIGS. 3 and 4, the fixed end plate 1b of the fixed scroll 1 has a substantially rectangular shape. The aforementioned through-hole 31 is formed in each corner 34 of the fixed end plate 1b.

Referring to FIGS. 5 and 6, the movable end plate 2b of the movable scroll 2 is provided with a business trip portion 3 protruding outward corresponding to each corner of the fixed end plate 1b of the fixed scroll 1.
5 are provided. Each of these business trip sections 35 is provided with the aforementioned cylindrical pin 32.

Referring to FIGS. 7 and 8, there is shown a scroll set in which the fixed scroll 1 and the movable scroll 2 are combined with each other. This scroll set is provided with a rotation preventing mechanism 9 'at each of four locations around it.

According to this scroll type fluid machine, since the rotation preventing mechanism 9 'is included in the scroll set, the total length is reduced and the degree of freedom in designing internal parts such as the counterweight is increased. In addition, the restriction that parts that rotate together with the shaft cannot be placed outside the rotation prevention mechanism has been removed, further increasing the design flexibility.

A fixed scroll 1 and a movable scroll 2
, The axial dimension of the movable spirally wound body 2a is L1, the length of the cylindrical pin 32 excluding the flange 33 is L2,
Assuming that the entire axial dimension of the fixed scroll 1 is L3, G = L1 + L2-L3.

As described above, since the number of elements constituting the axial gap G is reduced, the dispersion of the axial gap G can be reduced. Therefore, complicated adjustment work for the axial gap is not required.

Turning to FIGS. 9 and 10, a scroll type fluid machine according to a second embodiment of the present invention will be described. The same parts as those of the scroll type fluid machine of FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the illustrated scroll type fluid machine,
It includes a counterweight 17 ′ connected to the eccentric bush 11 to oppose the moment of the movable scroll 2. This counterweight 17 'is an eccentric bush 1
1 extends radially outward of the scroll set.

As described above, since the degree of freedom in designing the shape of the counterweight 17 'is increased, it is easy to design the center of gravity of the movable scroll 2 in the axial direction and the center of gravity of the counterweight 17' in the axial direction.

The cylindrical pin 32 may project from the movable spirally wound body 2a. In addition, the through-hole 31 may be formed in the movable scroll, and the cylindrical pin 32 may be provided to project from the fixed scroll. It is of course possible to form the outer periphery of the scroll type fluid machine in a circular shape.

[0034]

As described above, in the scroll type fluid machine according to the present invention, since the anti-rotation mechanism is included in the scroll set, the design for adjusting the dynamic imbalance by the counterweight is easy. In addition, it is possible to easily set an axial gap between the fixed scroll and the movable scroll.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a scroll type fluid machine according to a first embodiment of the present invention.

FIG. 2 is a front view of a counterweight used in the scroll fluid machine of FIG.

FIG. 3 is a front view of a fixed scroll used in the scroll fluid machine of FIG. 1;

FIG. 4 is a longitudinal sectional view of the fixed scroll of FIG. 3;

FIG. 5 is a front view of a movable scroll used in the scroll fluid machine of FIG. 1;

FIG. 6 is a vertical sectional view of the orbiting scroll shown in FIG. 5;

FIG. 7 and the fixed scroll of FIGS. 3 and 4 and FIGS. 5 and 6
It is a front view for explanation of the scroll set combined with the movable scroll of FIG.

FIG. 8 is a longitudinal sectional view of the scroll set of FIG. 7;

FIG. 9 is a longitudinal sectional view of a scroll type fluid machine according to a second embodiment of the present invention.

FIG. 10 is a plan view of a counterweight used in the scroll fluid machine of FIG. 9;

FIG. 11 is a longitudinal sectional view of an example of a conventional scroll type fluid machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 2 Movable scroll 3 Casing 4 Front housing 7 Discharge chamber 9, 9 'Rotation prevention mechanism 11 Eccentric bush 12 Bush bearing 13 Shaft 14 Shaft bearing 17, 17' Counterweight 21 Rotor 22 Electromagnetic clutch 31 Through hole 32 Cylindrical pin 33 Flange 34 Corner 35 Business trip

Claims (6)

[Claims] 1. A fixed scroll, a movable scroll which faces the fixed scroll in a direction of a predetermined axis, revolves without rotating about the predetermined axis, and cooperates with the fixed scroll to transfer a fluid, and a rotation of the movable scroll. A scroll-type fluid machine including a rotation-preventing mechanism for preventing rotation of the movable scroll and one end of the orbiting scroll in the direction of the predetermined axis, the driving mechanism being configured to apply a revolving force to the orbiting scroll. A scroll type fluid machine, wherein the scroll type fluid machine is included in a set of a scroll and the movable scroll. 2. The scroll type fluid machine according to claim 1, further comprising a position restricting means for directly restricting an axial position of the movable scroll with respect to the fixed scroll. 3. The rotation-preventing mechanism is formed in one of the fixed scroll and the movable scroll and extends through the through-hole parallel to the predetermined axis and the other through the through-hole parallel to the predetermined axis. The scroll fluid machine according to claim 1, further comprising a pin, wherein the through hole and the pin are set to have a diameter that cooperates with each other to prevent rotation of the movable scroll. 4. The fixed scroll includes a fixed spiral and a fixed end plate integrally fixed to one end of the fixed spiral in the axial direction, and the movable scroll includes a movable spiral and the movable spiral. A movable end plate integrally fixed to one end in the axial direction of the fixed spiral plate and the movable spiral plate in a state in which the fixed spiral plate and the movable spiral plate are engaged with each other in the direction of the predetermined axis. 4. The scroll-type fluid machine according to claim 3, wherein the through hole is formed in one of the fixed end plate and the movable end plate, and the pin protrudes from the other end. 5. The scroll-type fluid machine according to claim 3, wherein the pin has a flange at a tip end thereof, the flange engaging with the one side to regulate an axial position of the movable scroll with respect to the fixed scroll. . 6. A counterweight connected to the driving mechanism and opposing a moment of the movable scroll, wherein the counterweight extends from the driving mechanism radially outward of a set of the fixed scroll and the movable scroll. The scroll type fluid machine according to any one of claims 1 to 5, wherein