JPH05164083A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent floating of an eccentric bearing and a spring and to improve reliability by providing projections on an accommodation part face and an eccentric bearing face of a driving shaft end in those accommodating the eccentric bearing and the spring for pressing it at the driving shaft end into which a shaft of a turning scroll is fitted. CONSTITUTION:A movable scroll in a scroll type compression mechanism housed in a closed container has a shaft part supported by an eccentric bearing 23 at a hole part 24b at the end of a driving shaft 24 rotated by a motor part and is turned in the state where rotation is prevented by an Oldham's ring due to rotation of the driving shaft 24. The eccentric bearing 23 is prevented from moving in the normal state by a spring 25. In such a device, a projection 24b is provided on an accommodation part face of the hole part 24b of the driving shaft 24, while a projection 23a is provided on an eccentric bearing face of the eccentric bearing 23 opposed to it, and a spring 25 is arranged between them. By this, floating of the eccentric bearing 23 and the spring 25 from the driving shaft 24 can be prevented which occurs when a liquid is returned in the transition state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for an air conditioner or the like.

[0002]

2. Description of the Related Art As a hermetic electric compressor for refrigeration and air conditioning,
There are two types of compression mechanism, a reciprocating type and a rolling piston type, both of which have been used in the field of air conditioning for homes and businesses, but nowadays the number of reciprocating types is gradually decreasing in terms of cost and performance. Is coming. The scroll type has been put into practical use in place of the reciprocating type and the rotary type, taking advantage of its characteristics of low noise and low vibration.

FIG. 4 shows a vertical sectional view of a conventional scroll compressor. A compression mechanism 2 in which a fixed scroll 2a and a movable scroll 2b that orbits with respect to the fixed scroll 2a are meshed with each other is provided inside the closed container 1. The movable scroll 2b has its shaft 2c connected to the drive shaft 5. The movable scroll 2b is rotatably inserted into the eccentric bearing 6 of the hole 5b provided in the end 5a, and the movable scroll 2b is swung by the drive shaft 5 and the eccentric bearing 6. An eccentric bearing 6 and a spring 21 for preventing the eccentric bearing 6 from moving in a normal state are housed in a hole 5b provided in the end 5a of the drive shaft 5. The drive shaft 5 is supported by the bearing component 4, the rotor 7a of the electric motor 7 is attached to the drive shaft 5, and the drive shaft 5 is arranged in the closed container 1 together with the stator 7b fixed by shrink fitting. . The closed container 1 is provided with a gas suction pipe 11, a gas discharge pipe 16 and a sump 10 for storing lubricating oil. Reference numeral 19 is a check valve for preventing the movable scroll 2a from reversing at the time of stop, and 20 is an Oldham ring for preventing rotation of the movable scroll 2b to orbit the fixed scroll 2a.

Next, the operation of the compression mechanism having the above structure will be described. The low-pressure gas returns from the suction pipe 11 and is guided to the compression mechanism 2. By the orbiting movement of the movable scroll 2b with respect to the fixed scroll 2a, the sucked gas is compressed by the compression mechanism 2 into high pressure gas, discharged from the discharge pipe 16 to the outside of the closed container 1, and the low pressure gas is sucked again. The gas is circulated by returning from the pipe 11 to form a known compression cycle.

[0005]

In the case of this conventional scroll compressor, when the refrigeration cycle is in a transient state, the suction pipe 1
In the case where the liquid refrigerant returns from 1, the liquid refrigerant is sucked into the scroll wrap of the compression mechanism 2 and if the compression action is continued in that state, the liquid refrigerant is brought into a liquid compression state, and the scroll wrap is destroyed. The hole 5b provided in the end 5a of the drive shaft 5 is provided with the eccentric bearing 6 and the spring 21 for preventing the operation of the eccentric bearing 6 in a normal state, and in an abnormal state such as when sucking the liquid refrigerant, The spring 21 operates to move the orbiting scroll in the radial direction in the direction in which the orbiting radius becomes smaller and widen the gap with the fixed scroll, thereby releasing the liquid refrigerant and reducing the force applied to the wrap, thereby preventing the wrap from breaking. is doing. Therefore, in a liquid returning state in a transient state, the eccentric bearing 6 and the spring 21 operate in the hole 5b provided in the end portion 5a of the drive shaft 5, so that the eccentric bearing 6 and the spring 21 move. Of the end surface 2 of the orbiting scroll 2a which is lifted up from the hole 5b of the end 5a of the
There is a case in which the compressor contacts the d and causes the compression mechanism 2 to be broken, so that the reliability of the compressor cannot be secured.

[0006]

In order to solve the above problems, the present invention is directed to a fixed scroll, an orbiting scroll, a drive shaft for driving the orbiting scroll, a frame for supporting the drive shaft, and an Oldham for preventing rotation. A ring-shaped eccentric bearing that is movable in the radial direction and a spring that pushes the eccentric bearing are housed in the end of the drive shaft into which the shaft of the orbiting scroll fits, and a first part is provided on the housing surface of the end of the drive shaft. A convex portion or a concave portion is provided, a second convex portion is further provided on the eccentric bearing surface facing the first convex portion or the concave portion, and a spring is arranged between both convex portions or concave and convex portions.

[0007]

By the technical means of the present invention, it is possible to prevent the eccentric bearing for driving the orbiting scroll and the spring from being lifted up from the drive shaft in the liquid returning state, and to provide a highly reliable compressor. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an assembly view of a drive shaft hole portion, an eccentric bearing and a spring of a scroll compressor according to a first aspect of the present invention. Figure 2
It is a longitudinal section of the scroll compressor of the 1st present invention.

Here, the vertical sectional view of the scroll compressor of the present invention shown in FIG. 2 is substantially the same as the vertical sectional view of the conventional scroll compressor shown in FIG. The same numbers are used for parts.

In FIG. 2, a compression mechanism 2 in which a fixed scroll 2a and a movable scroll 2b which orbits with respect to the fixed scroll 2a are meshed with each other is provided inside the closed container 1, and the shaft of the movable scroll 2b is arranged. 2c is an eccentric bearing 2 having a hole 24b provided at the end 24a of the drive shaft 24.
3 is rotatably inserted and the movable scroll 2b is a drive shaft 2
4 and the eccentric bearing 23 cause the swivel motion. An eccentric bearing 23 and a spring 25 for preventing the eccentric bearing 23 from moving in a normal state are provided in a hole 24b provided in the end 24a of the drive shaft 24. A convex portion 24d is provided on the housing portion surface of the hole portion 24b of the drive shaft 24, and a convex portion 23a is provided on the eccentric bearing surface of the eccentric bearing 23 which faces the convex portion 24d.
5 are provided. The drive shaft 24 is supported by the bearing component 4. The rotor 7a of the electric motor 7 is attached to the drive shaft 24, and is arranged in the closed container 1 together with the stator 7b fixed by shrink fitting. The closed container 1 is provided with a gas suction pipe 11, a gas discharge pipe 16 and a sump 10 for storing lubricating oil. Reference numeral 19 is a check valve for preventing the movable scroll 2a from reversing at the time of stop, and 20 is an Oldham ring for rotation prevention for rotating the movable scroll 2b with respect to the fixed scroll 2a.

In FIG. 1, a convex portion 24d is provided on the housing portion surface of the hole portion 24b of the drive shaft 24, and a convex portion 23a is provided on the eccentric bearing surface of the eccentric bearing 23 which faces the convex portion 24d.
By disposing the eccentric bearing 23, the eccentric bearing 23 and the drive shaft hole portion 24b of the spring 25 due to the operation of the eccentric bearing 23 in the transient state.
The floating mechanism is prevented from coming into contact with the movable scroll end face 2d, and the scroll wrap is protected from liquid compression by allowing movement in the radial direction, thereby realizing high reliability of the compression mechanism.

As shown in FIG. 3, in the second aspect of the present invention, a concave portion is provided on the housing portion surface at the end of the drive shaft 27, and a convex portion 26a is provided on the eccentric bearing surface of the eccentric bearing 26 facing the concave portion. By disposing the spring 28, the floating of the eccentric bearing 26 and the spring 28 from the drive shaft hole portion 27b due to the operation of the eccentric bearing 26 in a transient state is restricted, and the movable scroll end surface 2 is provided.
High reliability of the compression mechanism is realized by preventing contact with d and allowing radial movement to protect the scroll wrap from liquid compression and the like.

[0013]

As is apparent from the above description, the present invention regulates the axial movement of the eccentric bearing and the spring for preventing the scroll wrap from being broken due to the liquid compression that occurs in the liquid returning state in the transient state. By allowing only the movement in the direction, it is possible to secure high reliability of the compression mechanism section and provide a highly reliable compressor.

[Brief description of drawings]

FIG. 1 is an assembly diagram in the vicinity of a drive shaft of a scroll compressor showing an embodiment of the first present invention.

FIG. 2 is a vertical sectional view of the compressor.

FIG. 3 is an assembly diagram in the vicinity of a drive shaft of a scroll compressor showing an embodiment of the second invention.

FIG. 4 is a vertical sectional view of a conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 airtight container 2 compression mechanism 2a fixed scroll 2b movable scroll 4 bearing part 5 drive shaft (conventional example) 6 eccentric bearing (conventional example) 7 electric motor 7a rotor 7b stator 10 oil sump 11 suction pipe 16 discharge pipe 19 check valve 20 Oldham ring 21 Spring (conventional example) 23 Eccentric bearing (first invention) 24 Drive shaft (first invention) 25 Spring (first invention) 26 Eccentric bearing (second invention) 27 Drive Shaft (second invention) 28 Spring (second invention)

Front page continuation (72) Inventor Michio Yamamura 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Kiyoshi Sawai, 1006, Kadoma, Kadoma City, Osaka (72) Invention Nojima Kojima Osaka Prefecture Kadoma City 1006 Kadoma, Matsushita Electric Industrial Co., Ltd. (72) Inventor Sadao Kawahara Kadoma City Osaka Prefecture Kadoma 1006, Matsushita Electric Industrial Co., Ltd. (72) Inventor Sakai Manabu Osaka Daiji Kadoma 1006 Matsushita Electric Industrial Co., Ltd. (72) Inventor Shuichi Yamamoto Kadoma City, Osaka 1006 Kadoma Matsushita Electric Industrial Co., Ltd. (72) Inventor Shotaro Ito Kadoma, Osaka 1006 Matsushita Electric Industrial In the company

Claims (2)

[Claims] 1. A fixed scroll, an orbiting scroll, a drive shaft for driving the orbiting scroll, a frame for supporting the drive shaft, and an anti-rotation Oldham ring. An eccentric bearing movable in the radial direction and a spring for pushing the eccentric bearing are housed in the drive shaft end portion, a first convex portion is provided on the housing portion surface of the drive shaft end portion, and the first convex portion is further provided. 2nd on the eccentric bearing surface
A scroll compressor in which the convex portions are provided and springs are arranged between the convex portions. 2. A fixed scroll, an orbiting scroll, a drive shaft for driving the orbiting scroll, a frame for supporting the drive shaft, and an anti-rotation Oldham ring. An eccentric bearing movable in the radial direction and a spring for pushing the same are housed in the end of the drive shaft, a recess is provided on the housing surface of the end of the drive shaft, and a projection is formed on the eccentric bearing surface facing the recess. A scroll compressor which is provided and whose axial movement of the spring is restricted by the uneven surface.