JPH05141356A - Closed type motor-operated compressor - Google Patents

Abstract

PURPOSE:To provide a compressor wherein efficiency is stabilized through stabilization of the size of a gap between a stator and a rotor and there is no need for a different part, except a block, in order to contain a rolling bearing (a ball bearing or a roller bearing). CONSTITUTION:A crank shaft 24, a ball bearing 25a by which a the crank shaft is axially supported, and a block 26 by which the bearing is supported are provided. The block is a bowl-form iron plate molded product or cast iron casting and provided at its central part with a bearing holding part 27. Further, the crank shaft 24 forms straddle mounted structure by means of other bearing holding part 30 and other rolling bearing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor used in refrigerators and the like.

[0002]

2. Description of the Related Art In recent years, a hermetic electric compressor (hereinafter referred to as "compressor") has been required to have high efficiency from the viewpoint of improving energy efficiency. Although the efficiency of compressors has advanced and reached a high level, it is necessary to achieve even higher efficiency.

An example of a conventional compressor will be described below with reference to the drawings. FIG. 5 is a side sectional view of a compressor disclosed in Japanese Patent Laid-Open No. 63-5186. Reference numeral 1 is a closed container that elastically supports the electric element 2 and the compression element 3.
The electric element 2 includes a stator 4, a rotor 5, and a crankshaft 6 fitted to the rotor 5.

Ball bearings 7 and 8 are attached to the upper and lower ends of a bearing 9 for supporting the crankshaft 6. Reference numeral 10 is an eccentric shaft integrally molded with the crankshaft 6, and one end of a connecting rod 11 is fitted and inserted therein. A piston 12 is connected to the other end of the connecting rod 11, and is fitted and inserted in the cylinder 13. The cylinder 13 is integrated with the block 13a.

In the compressor configured as described above,
When the compressor starts operating, the rotor 5 rotates, whereby the crank main shaft 6 rotates via the ball bearings 7 and 8, and the piston 12 via the eccentric shaft 10 and the connecting rod 11.
Reciprocate in the cylinder 13 to compress the gas.

[0006]

However, in the above-described structure, since the shaft 12 is supported on one side with respect to the compression direction of the piston 12 (a cantilever structure), as shown in FIG. The load acting on the ball bearing 7 with respect to the reaction W is W · L / K, which is larger than W. The ball bearing 8 also has a large load.

Therefore, the life of the ball bearings 7 and 8 is shortened, and it is difficult to secure reliability. Further, due to the radial clearances of the ball bearings 7 and 8, the size of the clearance between the stator 4 and the rotor 5 becomes unstable, leading to a decrease in motor efficiency.

Further, the bearing 9 which is a separate component from the block 13a is required to accommodate the ball bearing.

In view of the above problems, the present invention reduces the load applied to the rolling bearing to improve the life and reliability, and stabilizes the gap size between the stator and the rotor to stabilize the efficiency, and further the rolling bearing. It is intended to provide a compressor that does not require a separate component other than a block for storing the compressor.

[0010]

In order to solve the above problems, a compressor according to the present invention comprises an electric element elastically supported in a closed container, a compression element, and a crankshaft fixed to a rotor of the electric element. A rolling bearing that supports the crankshaft, and a block that supports the bearing. The block is a bowl-shaped iron plate molded product and has a bearing holding portion in the central portion.

Further, the rolling bearing is a ball bearing or a roller bearing, the bearing holding portion of the block is arranged at one position on the upper end of the electric element or at two positions of the upper end and the lower end, and the block is called an iron plate molded product or an iron header processed product. It has a configuration.

[0012]

According to the present invention, the rolling bearing having the above-mentioned structure has a double-supported structure to reduce the load load on the bearing to improve the life and reliability. Further, since the bearing holding portion of the block is arranged at two places, the upper end and the lower end of the electric element, it is possible to reduce the fluctuation of the gap size between the stator and the rotor, so that the motor efficiency can be stabilized. Since the block has the bearing holding portion in the central portion, no separate parts other than the block are required to accommodate the rolling bearing.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A compressor according to an embodiment of the present invention will be described below with reference to the drawings. The same components as those of the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

1 to 4, an electric element 21 and a compression element 22 elastically supported in a closed container 20, a crankshaft 24 fixed to a rotor 23 of the electric element, and a ball rotatably supporting the crankshaft. The bearing 25a or the roller bearing 25b is provided with a block 26 for supporting the bearing, and the block is a bowl-shaped iron plate molded product having a bearing holding portion 27 in the central portion. In addition, the crankshaft 24 has a double-supported structure by another bearing holding portion 30 and another ball bearing 31a or roller bearing 31b.

Further, the rolling bearing is a ball bearing 25a or a roller bearing 25b, the bearing holding portion 27 of the block 26 is arranged at one position at the upper end of the electric element 21, or at two positions of the upper end and the lower end, and the block 26 is made of an iron plate. It is equipped with a product or an iron header processed product.

In the structure as described above, the rolling bearing has a double-supported structure to reduce the load load on the bearing and improve the life and reliability. Further, since the bearing holding portion of the block is arranged at two places, the upper end and the lower end of the electric element, it is possible to reduce the fluctuation of the gap size between the stator and the rotor, so that the motor efficiency can be stabilized. Since the block has the bearing holding portion in the central portion, no separate parts other than the block are required to accommodate the rolling bearing.

Therefore, the load on the rolling bearing is reduced to improve the life and reliability of the rolling bearing, and the size of the gap between the stator and the rotor is stabilized to stabilize the efficiency. A compressor that does not require a separate part of

[0018]

As described above, according to the present invention, the electric element and the compression element elastically supported in the closed container, the crankshaft fixed to the rotor of the electric element, and the rolling element that pivotally supports the crankshaft. A bearing and a block for supporting the bearing are provided, and the block is a bowl-shaped iron plate molded product having a bearing holding portion in the central portion. Further, the rolling bearing is a ball bearing or a roller bearing, the bearing holding portion of the block is arranged at one place at the upper end of the electric element or at two places of the upper end and the lower end, and the block is an iron plate molded product, iron header processed product or cast iron cast product. The rolling bearing has a double-supported structure to reduce the load load on the bearing to improve the service life and reliability. Furthermore, the bearing holding part of the block is located at two points, the upper end and the lower end of the electric element. By disposing it, it is possible to reduce fluctuations in the gap size between the stator and the rotor, so that the motor efficiency can be stabilized. Since the block has the bearing holding portion in the center, it does not require a separate component other than the block to accommodate the rolling bearing, so that the following effects are achieved.

1. The block is a bowl-shaped iron plate molded product,
Rolling bearings can be attached without using separate parts.
Further, the block has high rigidity and good dimensional stability.

2. A ball bearing, which is a type of rolling bearing, reduces the rotational load and improves energy efficiency.

3. A roller bearing, which is a type of rolling bearing, can bear a large load. 4. Since the bearing holding portion of the block is arranged at two positions, the upper end and the lower end of the electric element, fluctuations in the size of the gap between the stator and the rotor can be reduced, so that the motor efficiency can be stabilized.

5. Since the block is a bowl-shaped iron header processed product, it is mass-produced and has high strength. 6. Since the block is made of cast iron cast article in the shape of a bowl, distortion does not occur on the header mounting surface that causes abnormal noise and input increase, and burr and springback of the block do not occur.

[Brief description of drawings]

1 is a side sectional view of a first embodiment of a compressor according to the present invention.

FIG. 2 is a side sectional view of a second embodiment of the compressor according to the present invention.

FIG. 3 is a side sectional view of a third embodiment of the present invention.

FIG. 4 is a side sectional view of a fourth embodiment of the present invention.

FIG. 5 is a side sectional view of a conventional compressor.

FIG. 6 is a schematic diagram of a load applied to a crank spindle of a conventional compressor.

[Explanation of symbols]

 20 Airtight container 21 Electric element 22 Compression element 23 Rotor 24 Crankshaft 25a Ball bearing 25b Roller bearing 26 Block 27 Bearing holding part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Wada 3-22 Takaida Hondori, Higashi-Osaka City, Osaka Prefecture Matsushita Refrigerator Co., Ltd. (72) Inventor Masahiko Ozaka 3-22 Takaida Hondori, East Osaka Matsushita Refrigerator Co., Ltd.

Claims (6)

[Claims] 1. An electric element and a compression element elastically supported in a hermetic container, a crankshaft fixed to a rotor of the electric element, a rolling bearing pivotally supporting the crankshaft, and a block supporting the bearing. Wherein the block is a bowl-shaped iron plate molded product and has a bearing holding portion in the central portion. 2. An electric element and a compression element elastically supported in a hermetic container, a crankshaft fixed to a rotor of the electric element, and a ball bearing which is a kind of a rolling bearing pivotally supporting the crankshaft. A hermetic electric compressor, comprising: a block supporting the bearing, wherein the block is a bowl-shaped iron plate molded product and has a bearing holding portion in a central portion. 3. An electric element and a compression element elastically supported in a hermetic container, a crankshaft fixed to a rotor of the electric element, and a roller bearing which is a kind of rolling bearing for supporting the crankshaft. A block supporting the bearing,
The block is an iron plate molded product having a bowl shape, and has a bearing holding portion in a central portion thereof. 4. An electric element and a compression element elastically supported in a hermetic container, a crankshaft fixed to a rotor of the electric element, a rolling bearing pivotally supporting the crankshaft, and a block supporting the bearing. And the block is a bowl-shaped iron plate molded product having a bearing holding portion in the central portion and arranged at two positions, the upper end and the lower end of the electric element. 5. An electric element and a compression element elastically supported in a hermetic container, a crankshaft fixed to a rotor of the electric element, a rolling bearing pivotally supporting the crankshaft, and a block supporting the bearing. Wherein the block is a bowl-shaped iron header processed product and has a bearing holding portion in the central portion. 6. An electric element and a compression element elastically supported in a hermetic container, a crankshaft fixed to a rotor of the electric element, a rolling bearing pivotally supporting the crankshaft, and a block supporting the bearing. Wherein the block is a bowl-shaped cast iron cast article and has a bearing holding portion in the center thereof.