JP2000320478A - Scroll-type fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve service life of bearing part and reduce generation of noise by providing a gravity center control means for controlling the position of the center of gravity of a movable scroll. SOLUTION: In a scroll-type compressor having a fixed scroll, a movable scroll 2 and a casing, holes 31a, 31b are formed at two axially opposite positions of the circumferential surface of the movable and plate of the scroll 2, which is in matching with the direction from the center of an outer diameter in the deviated direction of the center of gravity of the scroll 2. The hole 31a opposite to the deviated direction of the center of gravity serves as a screw hole, and a screw member 32 made of material having a specific gravity larger than that of the plate 2b is screwed thereinto. The position of center of the gravity of the scroll 2 is controlled in this way, and a gravity center control means is constituted of the holes 31a, 31b and the member 32. Accordingly, the center of gravity of the scroll 2 as a whole is made to coincide with to the center of the outer diameter of the plate 2b and the center of an annular protrusion 2c, thereby reducing the load on a main bearing, resulting in improvement of service life and reduction in generation of noise and vibration.

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 widely used as a compressor in various fields such as a vehicle air conditioner, and more particularly to a movable scroll included therein.

[0002]

2. Description of the Related Art A scroll compressor is disclosed in, for example, JP-A-7-310885 and JP-A-5-302578.

FIG. 4 shows a conventional scroll type fluid machine. The illustrated scroll type fluid machine is suitable for use in a vehicle air conditioner, and includes a fixed scroll 1 and a movable scroll 2 paired with the fixed scroll 1.
And a casing 3 containing them, and a front housing 4 fixed to the open end of the casing 3 and closed there. 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 spiral body 2a and a movable end plate 2b integrally fixed to one end in the axial direction thereof. 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 drive 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.

Further description of the orbiting scroll 2 will be supplemented with reference to FIGS. 5 (a) and 5 (b). Movable end plate 2
b is a disk shape, and its outer diameter center 25 has a movable spiral coil 2
a coincides with the center of the spiral. In addition, the annular protrusion 2c
Also, the center thereof coincides with the center of the spiral of the movable spiral body 2a.

[0010]

However, the center of gravity 26 of the entire movable scroll 2 does not coincide with the center 25 of the outer diameter of the movable end plate 2b or the center of the annular projection 2c. That is, the center of gravity of the movable end plate 2b coincides with its outer diameter center 25, but the center of gravity 26 of the movable spirally wound body 2a does not coincide with the outer diameter center 25 of the movable end plate 2b due to its special shape. Therefore, when the movable scroll 2 is viewed as a whole, the center of gravity 26 is slightly displaced from the outer diameter center 25 of the movable end plate 2b.

Conventionally, this displacement of the center of gravity is ignored because it is not fatal to the scroll type fluid machine.
This causes a reduction in the life of the bearing portion and the generation of vibration and noise.

SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll-type fluid machine which can improve the life of a bearing portion and reduce vibration and noise.

[0013]

According to the present invention, a fixed scroll, a movable scroll which cooperates with the fixed scroll to confine a gas fluid, and orbits the movable scroll on a circular orbit to cause the transfer of the gas fluid. In a scroll type fluid machine including a drive mechanism and a rotation preventing mechanism for preventing rotation of the movable scroll, a scroll type fluid machine provided with a center of gravity adjusting means for adjusting a position of a center of gravity of the movable scroll is provided. can get.

[0014] The movable scroll may have a spiral body and an end plate connected to one end of the spiral body in the axial direction, and the center of gravity adjusting means may be provided on the end plate.

[0015] The center of gravity adjusting means may have a cavity formed in the end plate.

The space may be a hole formed by drilling a peripheral surface of the end plate.

The center-of-gravity adjusting means may include a member having a large specific gravity in which a part of the end plate is replaced.

The member having a large specific gravity may be added to a notch provided in a part around the end plate.

[0019]

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 FIGS. Parts similar to those of the scroll type fluid machine of FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1 and FIG.
On the peripheral surface of the movable end plate 2b, holes 31a and 31b are formed by drilling at two locations facing each other in the radial direction in accordance with the direction of displacement of the center of gravity from the outer diameter center 25. Further, a hole 31a opposite to the direction of the shift of the center of gravity is a screw hole, and a screw member 3 made of a material having a specific gravity greater than that of the movable end plate 2b
Screw 2. Thus, the position of the center of gravity of the movable scroll 2 is adjusted. In this case, the holes 31a and 31b and the screw member 3
2 together constitute a center of gravity adjusting means.

The position of the center of gravity of the movable scroll 2 may be adjusted by inserting and fixing members having different sizes and specific gravities into both holes 31a and 31b.

Also, without using the screw member 32,
By selecting the diameter and depth of the holes 31a and 31b, the position of the center of gravity of the movable scroll 2 may be adjusted.

According to this structure, the center of gravity 26 of the entire movable scroll 2 coincides with the center 25 of the outer diameter of the movable end plate 2b and the center of the annular projection 2c, so that the load applied to the main bearing 15 is reduced, and the life is shortened. improves. Further, generation of vibration and noise can be reduced.

Referring to FIG. 3, a scroll type fluid machine according to a second embodiment of the present invention will be described. The same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 3, the peripheral surface of the movable end plate 2b of the movable scroll 2 is robbed by milling at two locations facing each other in the radial direction in accordance with the direction of displacement of the center of gravity from the center 25 of the outer diameter. Notches 33a and 33b are provided. further,
A weight member 34 made of a material having a specific gravity greater than that of the movable end plate 2b is provided in the notch 33a on the side opposite to the direction of the shift of the center of gravity.
Insert and secure. Thus, the position of the center of gravity of the movable scroll 2 is adjusted. In this case, the notch portions 33a and 33b and the weight member 34 together constitute a center of gravity adjusting means.

The position of the center of gravity of the movable scroll 2 may be adjusted by inserting and fixing members having different sizes and specific gravities into both the notches 33a and 33b.

Also, without using the weight member 34,
The position of the center of gravity of the orbiting scroll 2 may be adjusted by selecting the width and depth of the notches 33a and 33b.

Also with this structure, the center of gravity 26 of the entire movable scroll 2 coincides with the center 25 of the outer diameter of the movable end plate 2b and the center of the annular projection 2c, so that the load applied to the main bearing 15 is reduced and the life is shortened. improves. Further, generation of vibration and noise can be reduced.

It goes without saying that a combination of the above-described embodiments is also possible. Further, the number and position of the holes and cutouts can be variously modified.

[0030]

As described above, according to the present invention,
A scroll-type fluid machine capable of improving the life of a bearing portion and reducing vibration and noise can be provided.

[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.

2 shows a movable scroll included in the scroll type fluid machine of FIG. 1, (a) is a side view, and (b) is II thereof.
FIG. 2 is a cross-sectional view along the line II.

3A and 3B show a movable scroll included in a scroll type fluid machine according to a second embodiment of the present invention, wherein FIG. 3A is a side view, and FIG. 3B is a cross-sectional view thereof along line III-III. It is.

FIG. 4 is a vertical sectional view of a conventional scroll type fluid machine.

5A and 5B show a movable scroll included in the scroll type fluid machine of FIG. 4, wherein FIG. 5A is a side view, and FIG.
It is sectional drawing which followed the V line.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fixed scroll 1a fixed vortex winding 1b fixed end plate 2 movable scroll 2a movable vortex winding 2b movable end plate 2c annular protrusion 3 casing 4 front housing 5 closed space 11 eccentric bush 12 drive bearing 13 shaft 13a large diameter portion 15 main Bearing 16 Eccentric pin 25 Center of outer diameter of movable end plate 26 Center of gravity of movable scroll 31a, 31b Hole 32 Screw member 33a, 33b Notch portion 34 Weight member

Claims (6)

[Claims] 1. A fixed scroll, a movable scroll that cooperates with the fixed scroll to confine a gas fluid, a drive mechanism that revolves the movable scroll on a circular orbit to cause the transfer of the gas fluid, and a rotation mechanism that rotates the movable scroll. A scroll type fluid machine including a rotation preventing mechanism for preventing rotation, wherein a center of gravity adjusting means for adjusting the position of the center of gravity of the movable scroll is provided. 2. The scroll according to claim 1, wherein the movable scroll has a spiral body and an end plate connected to one end in the axial direction of the spiral body, and the center of gravity adjusting means is provided on the end plate. The scroll-type fluid machine according to claim 1. 3. The scroll-type fluid machine according to claim 2, wherein said center-of-gravity adjusting means has a cavity formed in said end plate. 4. The scroll-type fluid machine according to claim 3, wherein the space is a hole formed by drilling a peripheral surface of the end plate. 5. The scroll-type fluid machine according to claim 2, wherein said center-of-gravity adjusting means has a member having a large specific gravity in which a part of said end plate is replaced. 6. The scroll-type fluid machine according to claim 5, wherein the member having a large specific gravity is added to a notch provided in a part around the end plate.