JPH10141249A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent uneven contact of a bearing part, to be generated caused by tilting of a crankshaft of a scroll compressor. SOLUTION: A main bearing 19 is provided on the side end of an electric motor of a bearing part 21, the inside diameter of the main bearing 19 is so made as to be gradually increased toward the opposite side to the electric motor along the axial direction of a main shaft, uneven contact of not only the main baring 19 and an auxiliary bearing 23 but also a main shaft thrust part 25 can be avoided, and therefore, performance and reliability are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll compressor for refrigeration and air conditioning.

[0002]

2. Description of the Related Art Conventionally, this kind of technology has been disclosed in
There is one described in JP-A-149784. This will be described below with reference to the drawings. 4 and 5 are a cross-sectional view and an enlarged view of a main part of the scroll compressor disclosed in Japanese Patent Application Laid-Open No. 2-149784. A stub bearing 54 is provided between the end plate 52 of the orbiting scroll 51 and the crankshaft 53.
A main crank bearing 56 is provided between the crank shaft 53 and the frame 55 on the revolving scroll 51 side, and a sub crank bearing 58 is provided on the electric motor 57 side.
Are provided respectively. Further, each bearing 56,
The inner peripheral surfaces 56 a and 57 a of the 57 are formed as tapered surfaces along the inclination of the crankshaft 53.

[0003]

However, the above-mentioned conventional configuration has the following problems. This crankshaft supports its own weight and the weight of the rotor of the electric motor by the back of the main crankshaft. When the crankshaft is tilted along the tapered surface of the bearing in such a configuration, the rear surface of the main crankshaft naturally comes into contact with the frame, which is the supporting surface, and the performance and reliability are significantly reduced. Further, it is extremely difficult to machine both the main crank bearing and the sub-crank bearing into a taper along the inclination of the crankshaft due to tolerances in the clearances of the bearings, differences in the inclination of the crankshaft due to operating conditions, and the like.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to prevent a decrease in performance and reliability due to each bearing.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an electric motor and a compression mechanism driven by the electric motor inside a closed container, and the compression mechanism is turned with a fixed spiral blade part. A swirl vane part, a rotation restraining part that prevents the swirl vane part from rotating and performs only a swivel motion, a crankshaft that drives the swirl vane part to swivel, and a main shaft formed at one end of the crankshaft. A main bearing part having a main bearing to be supported, and a sub-bearing part having a sub-bearing to support the other end of the crankshaft, wherein the main bearing is provided at a motor-side end of the main bearing part. The inner diameter of the main bearing is designed to gradually increase as it moves toward the non-motor side along the axial direction of the main shaft.

[0006] According to the above configuration, it is possible to easily avoid one-side contact of each bearing portion, and to provide a scroll compressor with high performance and high reliability.

[0007]

According to the first aspect of the present invention, a main bearing is provided at a motor-side end of a main bearing component, and an inner diameter of the main bearing is set in the axial direction of the main shaft. It gradually increases as it goes to the anti-motor side. According to this configuration, in addition to the main shaft portion and the sub bearing portion, it is possible to avoid one-side contact in the main shaft thrust portion.

According to a second aspect of the present invention, the auxiliary bearing for supporting the other end of the crankshaft is constituted by a rolling bearing. According to this configuration, it is possible to easily avoid contact with one piece only by processing the main shaft portion.

According to a third aspect of the present invention, the inner diameter of the main bearing is gradually increased toward the non-motor side along the axial direction of the main shaft, and the supporting flange is provided on the main shaft side of the crankshaft during assembly. A small gap is provided between the flange and the end of the bearing component on the crankshaft side. With this configuration, it is easy to assemble the support structure for both ends of the crankshaft, and it is also possible to avoid one bearing of each bearing portion.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

A compression mechanism 2 and a stator 4 of an electric motor 3 for driving the compression mechanism 2 are fixed inside the closed casing 1, and a crank shaft 6 for driving the compression mechanism 2 is connected to a rotor 5 of the electric motor. The compression mechanism 2 includes a fixed spiral blade component 10 having a fixed spiral blade 9 formed integrally with a fixed head 8, and a plurality of compression working spaces 14 engaged with the fixed spiral blade 9.
, A swirling spiral blade component 13 having a swirling spiral blade 11 formed on a swiveling head plate 12, a rotation restraining component 15 that prevents the swirling spiral blade component 13 from rotating and performs only swiveling, A turning drive shaft 16 provided on the opposite side of the spiral blade 11, and a main shaft 18 of the crankshaft 6;
And an eccentric drive engagement portion 17 into which the turning drive shaft 16 is fitted, and a bearing component 21 having a main bearing 19 for supporting the main shaft 18 of the crankshaft 6. The main bearing 19 is provided at the end of the bearing component 21 on the crankshaft side, and is configured such that the inner diameter gradually increases toward the non-motor side along the axial direction of the main shaft. . Also, at the other end of the crankshaft 6,
A countershaft 22 is provided, and the countershaft 22 is
3 is supported by a sub-bearing part 24 including Therefore, the crankshaft 6 is supported by the main bearing 19 and the sub-bearing 23 at both ends. In the above configuration, when the compressor is operated, a rotational load in the radial direction due to the compressor gas acts on the main bearing 19. Also,
A minute gap is provided between the main shaft 18 and the main bearing 19, and the main shaft 19 is inclined in this gap.
The inner diameter of the main bearing 19 gradually increases along the axial direction of the main shaft 18 toward the non-motor side, so that it is inclined along this surface. When the main shaft 18 tilts, the rear surface 25 also tilts.
9 is provided at the motor-side end portion 26 of the bearing component 21 and has no contact portion. As a result, even when the main shaft 18 is inclined, the main shaft 18 does not hit one side in any part. Therefore, it is possible to prevent the performance from being reduced due to the contact with one piece and the reliability from being significantly reduced.

The sub-bearing 23 for supporting the sub-shaft 22 of the crankshaft 6 is constituted by a rolling bearing. Rolling bearings allow a considerable degree of tilt due to their radial clearance. Therefore, it is possible to avoid a single contact of each bearing portion due to the inclination of the main shaft 18 of the main shaft of the crankshaft 6 by processing only the main bearing 19.

In FIG. 3, a flange portion 27 is provided on the bearing component 19 side of the crankshaft 6 as a reference when assembling. The flange 27 is provided on the bearing part 19 to position the electric motor 3 and the like. At this time, the center position of the rotor 5 is shifted from the center position of the stator 4 toward the compression mechanism 2, and a force is generated in the direction of moving to the opposite side to the compression mechanism 2 when energized. As a result, a minute gap 28 exists between the flange 27 and the end of the bearing component 19 on the bearing side. With this configuration, even when the main shaft 18 is tilted, the assembly reference flange portion 27 does not come into contact with the bearing component 19.

[0014]

As is apparent from the above embodiment, according to the first aspect of the present invention, the main bearing is provided at the motor-side end of the main bearing component, and the inner diameter of the main bearing is set in the axial direction of the main shaft. It gradually increases as it goes to the anti-motor side. According to this configuration, in addition to the main shaft portion and the sub-bearing portion, it is possible to avoid one-side contact in the main shaft thrust portion and to provide a scroll compressor with high performance and high reliability.

According to a second aspect of the present invention, the auxiliary bearing for supporting the other end of the crankshaft is constituted by a rolling bearing. According to this configuration, it is possible to easily avoid the one-side contact only by processing the main shaft portion, so that there is an effect that performance and reliability can be easily improved.

According to a third aspect of the present invention, the inner diameter of the main bearing is gradually increased along the axial direction of the main shaft toward the non-motor side, and the inner diameter of the main bearing is supported on the main shaft side of the crankshaft during assembly. A flange is provided, and a minute gap is provided between the flange and the end of the bearing component on the crankshaft side. With this configuration, it is easy to assemble the support structure for both ends of the crankshaft, and it is possible to avoid one contact of each bearing portion.

[Brief description of the drawings]

FIG. 1 is a sectional view of a compressor showing one embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the same embodiment.

FIG. 3 is a sectional view of a compressor showing another embodiment of the present invention.

FIG. 4 is a sectional view of a compressor showing a conventional example.

FIG. 5 is an enlarged view of a main part showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism 3 Electric motor 6 Crankshaft 10 Fixed spiral blade part 13 Revolving spiral blade part 15 Rotation restraining part 18 Main shaft 19 Main bearing 21 Bearing part 23 Secondary bearing 24 Secondary bearing part 27 Flange part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Shozo Hase 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Takashi Morimoto 1006 Kadoma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Hiromasa Ashiya 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] An electric motor and a compression mechanism driven by the electric motor are provided inside a closed container, and the compression mechanism is used to prevent a fixed spiral blade component, a swirling spiral blade component, and a rotation of the swirling spiral blade component. A main shaft bearing component having a main shaft that supports a main shaft formed at one end of the crankshaft; a main bearing component having a main shaft formed at one end of the crankshaft; The main bearing is provided at the motor-side end of the main bearing component, and the inner diameter of the main bearing is in the axial direction of the main shaft. A scroll compressor that gradually increases as it moves toward the anti-motor side. 2. The scroll compressor according to claim 1, wherein the sub-bearing for supporting the other end of the crankshaft is a rolling bearing. 3. An electric motor and a compression mechanism driven by the electric motor are disposed inside the closed container, and the compression mechanism is used to prevent the fixed spiral blade component, the swirling spiral blade component, and the self-rotating spiral blade component from rotating. A rotation-restricting component that performs only a pivoting motion, a crankshaft that pivotally drives the rotary spiral blade component, and a main bearing that supports a main shaft formed at one end of the crankshaft, at an end of the crankshaft. A main bearing component, comprising a sub bearing component having a sub bearing that supports the other end of the crankshaft, the inner diameter of the main bearing,
It gradually increases as it goes to the anti-motor side along the axial direction of the main shaft, and a supporting flange portion at the time of assembly is provided on the main shaft side of the crankshaft, and the flange portion and the end of the bearing component on the crankshaft side are provided. A scroll compressor with a small gap between the part.