JP3114300B2 - Scroll compressor - Google Patents

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 reciprocating type and rolling piston type compression mechanisms.Each type has been used in the home and commercial air conditioning fields, but the reciprocating type is gradually decreasing in terms of cost, performance, etc. Is coming. The scroll type has been put to practical use instead of a reciprocating type or a rotary type, taking advantage of its low noise and low vibration characteristics.

FIG. 4 is a longitudinal sectional view of a conventional scroll compressor. A compression mechanism 2 in which a fixed scroll 2a and a movable scroll 2b orbiting with respect to the fixed scroll 2a are meshed with each other is disposed inside the closed casing 1, and the movable scroll 2b has its shaft 2c connected to the drive shaft 5. The orbiting scroll 2b is rotated by the drive shaft 5 and the eccentric bearing 6 by being rotatably inserted into the eccentric bearing 6 of the hole 5b provided at the end 5a. An eccentric bearing 6 and a spring 21 for preventing the eccentric bearing 6 from moving in a normal state are accommodated in a hole 5b provided at the end 5a of the drive shaft 5. The drive shaft 5 is supported by a bearing part 4, and a rotor 7 a of an electric motor 7 is attached to the drive shaft 5, and is disposed in the sealed container 1 together with a stator 7 b fixed by shrink fitting. . The closed container 1 is provided with a gas suction pipe 11, a gas discharge pipe 16, and an oil reservoir 10 for storing lubricating oil. Reference numeral 19 denotes a check valve for preventing the movable scroll 2a from rotating backward when stopped, and reference numeral 20 denotes an Oldham ring for preventing the movable scroll 2b from rotating with respect to the fixed scroll 2a.

Next, the operation of the compression mechanism having the above configuration will be described. The low-pressure gas returns from the suction pipe 11 and is guided to the compression mechanism 2. As the orbiting scroll 2b orbits with respect to the fixed scroll 2a, the sucked gas is compressed by the compression mechanism 2 to become a high-pressure gas, discharged from the discharge pipe 16 to the outside of the closed vessel 1, and sucks the low-pressure gas again. The gas is circulated back from the pipe 11 to form a well-known compression cycle.

[0005]

In the case of this conventional scroll compressor, when the refrigerating cycle is in a transient state, the suction pipe 1
When 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 enters a liquid compression state, causing the scroll wrap to break. The eccentric bearing 6 and a spring 21 for preventing the operation of the eccentric bearing 6 in a normal state are provided in a hole 5b provided at the end 5a of the drive shaft 5, and in an abnormal state such as when the liquid refrigerant is sucked, The spring 21 operates to move the orbiting scroll in the radial direction to reduce the turning radius, thereby widening the gap with the fixed scroll, thereby allowing the liquid refrigerant to escape and reducing the force applied to the wrap, thereby preventing the wrap from being broken. doing. Accordingly, in a liquid return state in a transient state, the eccentric bearing 6 and the spring 21 operate in the hole 5b provided in the end 5a of the drive shaft 5, and therefore the eccentric bearing 6 and the spring 21 End face 2 of the movable scroll 2a
d, the compression mechanism 2 may be broken, and the reliability of the compressor may not be secured.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a fixed scroll, an orbiting scroll, a drive shaft for driving the orbiting scroll, a frame for supporting the drive shaft, and a non-rotating Oldham. An eccentric bearing that can be moved in the radial direction and a spring that presses the eccentric bearing are housed in the end of the drive shaft, which is formed with a ring, and the shaft of the orbiting scroll fits therein. A convex portion or a concave portion is provided, a second convex portion is provided on an eccentric bearing surface opposed to the first convex portion or the concave portion, and a spring is provided between the two convex portions or the concave and convex portions.

[0007]

According to the technical means of the present invention, it is possible to prevent the eccentric bearing and the spring that drive the orbiting scroll from rising from the drive shaft in the liquid return state or the like, and to provide a highly reliable compressor. .

[0008]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an assembly diagram of a drive shaft hole, an eccentric bearing and a spring of a scroll compressor according to the first invention. FIG.
It is a longitudinal section of the scroll compressor of the 1st present invention.

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 orbiting with respect to the fixed scroll 2a are meshed with each other is provided inside the closed casing 1, and a shaft of the movable scroll 2b is provided. 2c is an eccentric bearing 2 of a hole 24b provided at an end 24a of the drive shaft 24.
3 and is rotatably inserted into the movable scroll 2b.
4 and by the eccentric bearing 23. 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 at an 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 opposed thereto.
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 disposed in the closed casing 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 an oil reservoir 10 for storing lubricating oil. Reference numeral 19 denotes a check valve for preventing the movable scroll 2a from rotating backward when stopped, and reference numeral 20 denotes an Oldham ring for preventing the movable scroll 2b from rotating with respect to the fixed scroll 2a.

In FIG. 1, a convex portion 24d is provided on a storage portion surface of a hole portion 24b of a drive shaft 24, and a convex portion 23a is provided on an eccentric bearing surface of an eccentric bearing 23 opposed thereto.
The drive shaft hole 24b of the eccentric bearing 23 and the spring 25 due to the operation of the eccentric bearing 23 in the transient state by disposing
The floating mechanism prevents the scroll from coming into contact with the end surface 2d of the orbiting scroll, and allows the movement in the radial direction to protect the scroll wrap from liquid compression and the like, thereby achieving high reliability of the compression mechanism.

In the second embodiment of the present invention, as shown in FIG. 3, 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 opposed thereto. By disposing the spring 28, the floating of the eccentric bearing 26 and the spring 28 from the drive shaft hole 27 b due to the operation of the eccentric bearing 26 in the transient state is restricted, and the movable scroll end face 2 is controlled.
By preventing the contact with the d, and allowing the movement in the radial direction to protect the scroll wrap from liquid compression or the like, high reliability of the compression mechanism is realized.

[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 from the liquid compression which occurs during the liquid return state in the transient state, and the radius. By allowing only movement in the direction, high reliability of the compression mechanism can be ensured, and a highly reliable compressor can be provided.

[Brief description of the drawings]

FIG. 1 is an assembly view of the vicinity of a drive shaft of a scroll compressor according to a first embodiment of the present invention.

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

FIG. 3 is an assembly view showing the vicinity of a drive shaft of a scroll compressor according to a second embodiment of the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism 2a Fixed scroll 2b Movable scroll 4 Bearing part 5 Drive shaft (conventional example) 6 Eccentric bearing (conventional example) 7 Motor 7a Rotor 7b Stator 10 Oil reservoir 11 Suction pipe 16 Discharge pipe 19 Check valve Reference Signs List 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)

──────────────────────────────────────────────────続 き Continued on the front page (72) Michio Yamamura 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Kiyoshi Sawai 1006 Kadoma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Nobuyoshi Kojima 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Sadao Kawahara 1006 Odaka, Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Invention Manabu Sakai 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture (72) Inside of Matsushita Electric Industrial Co., Ltd. (72) Inventor Shuichi Yamamoto 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside of Matsushita Electric Industrial Co., Ltd. 1006 Kadoma, Ichidai-shi Matsushita Electric Industrial Co., Ltd. (56) References JP-A-62-282186 (JP, A) JP-A-2-252990 (J , A) (58) investigated the field (Int.Cl. ^7, DB name) F04C 18/02 311

Claims (2)

(57) [Claims] 1. A fixed scroll, an orbiting scroll,
A drive shaft that drives the orbiting scroll, a frame that supports the drive shaft, and an Oldham ring that prevents rotation, and an offset part that can move in the radial direction to the end of the drive shaft where the shaft of the orbiting scroll fits. A core bearing and a spring for pressing the core bearing are housed, a first convex portion is provided on a radial end surface of a spring housing portion of the drive shaft end, and a second eccentric bearing surface facing the first convex portion is provided on a second eccentric bearing surface. Protrusions are provided, and a spring is arranged between both convex parts,
In addition, the first and second convex portions have a compressive load on the spring.
Even when the voltage is suddenly applied or released, the spring will
The feature is that it is large enough not to deviate
And scroll compressor. 2. A fixed scroll, an orbiting scroll,
An eccentric, which comprises a drive shaft for driving the orbiting scroll, a frame supporting the drive shaft, and an Oldham ring for preventing rotation, and which can move in the radial direction to the end of the drive shaft to which the orbiting scroll shaft is fitted. A bearing and a spring for pressing the same are housed, a concave portion is provided on a radial end surface of a spring housing portion of the end portion of the drive shaft, and a convex portion is further provided on an eccentric bearing surface facing the concave portion, and the concave and convex portion is formed by a spring. Compressive load suddenly
Spring deviates from the specified position even when applied or released
A scroll compressor having a size large enough to prevent the movement of the spring in the axial direction on the uneven surface.