JPH06117374A - Sealed type motor-driven compressor - Google Patents

Abstract

PURPOSE:To prevent the deterioration of reliability and reduce dimension by carrying out assembly of a compressor in the state where a rolling bearing is assembled on a crankshaft, when the rolling bearing is used, in order to improve the assembly workability of a sealed type motor-driven compressor used for a refrigerator, etc. CONSTITUTION:A sealed type motor-driven compressor is constituted of a body 15a, piston 16 connected with one edge of the body 15a, cylinder 22, and a cut part 25 formed on the cylinder 22 into which the body 15a is insertion-fitted.

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 to a high level, it is necessary to make them even more efficient.

An example of a conventional compressor will be described below with reference to the drawings. FIG. 6 is a side sectional view of a compressor disclosed in Japanese Patent Laid-Open No. 3-31587. Reference numeral 1 denotes a closed container which elastically supports the electric element 2 and the compression element 3.
The electric element 2 includes a stator 4, a rotor 5, and a rotor 5.
Is equipped with a crankshaft 6 fitted to. Crankshaft 6
Has an eccentric shaft 7, a crank main shaft 6a on the electric element 2 side of the eccentric shaft 7, and a crank auxiliary shaft 6b on the opposite electric element 2 side.

Reference numerals 8 and 9 are ball bearings, and the ball bearing 8 is press-fitted into the crank main shaft 6a. The ball bearing 9 is press-fitted into the crank counter shaft 6b and fixed together with the thrust plate 10 by bolts 11. 12
Is fixed to the block 13 with a bolt 14 by a bearing. Further, the connecting rod 15 has one end divided into a body 15a and a cap 15b in order to be assembled,
The body 15a and the cap 15b are assembled with the eccentric shaft 7 sandwiched therebetween, and are fixed with bolts 15c. A piston 16 is connected to the other end of the connecting rod 15, and a cylinder 17
It is inserted inside.

Regarding the compressor configured as described above,
The operation will be described below. When the compressor starts operating, the rotor 5 rotates, whereby the crankshaft 6 rotates via the ball bearings 8 and 9, and the eccentric shaft 7 and the connecting rod 15 rotate.
The piston 16 reciprocates in the cylinder 17 via the to compress the gas.

[0006]

However, in the above structure, the ball bearing 8 is press-fitted into the crank main shaft 6a after the crank shaft 6 is inserted into the bearing 12, and the ball bearing 9 is mounted on the block 13 before being cranked. Workability is poor because it is press-fitted and fixed to the counter shaft 6b. Also,
When assembling after press-fitting the ball bearings 8 and 9 into the crank main shaft 6a and the crank counter shaft 6b respectively, the body 1
If the length of the cylinder 17 is shortened in order to prevent the 5a and the ball bearing 9 from interfering with each other, the reliability of the compressor is lowered, and if the cylinder 17 is moved away from the crankshaft 6, the compressor is increased in size. It had a problem of becoming a cause.

The present invention solves the above problems, and an object of the present invention is to provide a compact compressor which is easy to assemble and does not reduce reliability.

[0008]

To achieve this object, a compressor of the present invention comprises an electric element elastically supported in a hermetic container, a compression element, and a crankshaft fixed to a rotor of the electric element. An eccentric shaft provided on the crankshaft, a connecting rod having one end fitted to the eccentric shaft and the other end connected to a piston, and a cylinder on which the piston slides, the connecting rod fitted to the eccentric shaft The crankshaft has a crank main shaft on the electric element side and a crank auxiliary shaft on the non-electric element side with respect to the axial direction of the eccentric shaft, and the crankshaft rolls at least on the crank main axis. A bearing is provided, and a cutout into which a part of the piston side portion of the connecting rod is fitted and inserted into the cylinder.

Further, a plurality of notches are provided.
Further, the notch is formed in the rotation direction of the crankshaft.

[0010]

The compressor of the present invention can be assembled after the rolling bearing is press-fitted into the crankshaft with the above-mentioned structure, so that the assembling workability is good, and the cylinder length does not need to be shortened, so the reliability is not deteriorated. Since it is not necessary to keep the cylinder away from the crankshaft, the size can be reduced.

Further, since the notch is not provided in the portion that receives the lateral pressure of the piston, it is possible to prevent the reliability from further deteriorating.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A compressor according to a first 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 3, reference numeral 20 denotes a block, which is a housing portion 21 for holding the ball bearing 8.
And the cylinder 22 are integrally molded. A holder 23 holds the ball bearing 9 and is fixed to the cylinder 22 with a bolt 24. Reference numeral 25 denotes a pair of notches provided in the cylinder 22. When the body 15a is fitted and inserted, the end surface of the body 15a on the cap 15b side is closer to the cylinder 22 side than the inner surface of the housing portion 21.

In the compressor configured as described above,
By inserting the sub-assembly product of the piston 16 and the body 15a into the cylinder 22 and inserting the body 15a into the notch 25, the sub-assembly product in which the ball bearings 8 and 9 are press-fitted into the crank main shaft 6a and the crank counter shaft 6b, respectively. Body 15 when assembled in the housing part 21
It can be assembled without interference between a and the ball bearing 8. Therefore, workability can be significantly improved.

Further, since it is not necessary to shorten the length of the cylinder 22, reliability is not deteriorated.

Further, since it is not necessary to keep the cylinder 22 away from the crankshaft 6, the compressor can be downsized.

Next, a second embodiment of the compressor according to the present invention will be described with reference to the drawings. Note that, in FIGS. 4 and 5, the same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted, and an arrow A indicates the rotation direction of the crankshaft 6. Reference numeral 30 is a notch provided in the rotation direction of the crankshaft 6 of the cylinder 22.

In the compressor configured as described above,
It has the same effect as the first embodiment. Further, when the refrigerant gas is compressed, lateral pressure is applied to the piston 16, but the cylinder 22
Since the notch is provided on the rotational direction side of the crankshaft 6 where no lateral pressure is applied, the piston 16 is less likely to be worn and the reliability can be further prevented from lowering.

[0019]

As described above, according to the compressor of the present invention,
An electric element elastically supported in a closed container, a compression element, a crankshaft fixed to the rotor of the electric element, an eccentric shaft provided on the crankshaft, and one end fitted to the eccentric shaft and the other end. A connecting rod connected to a piston, and a cylinder on which the piston slides, the connecting rod is divided into two parts at a portion fitted with the eccentric shaft, and the crankshaft extends in the axial direction of the eccentric shaft. On the other hand, it has a crank main shaft on the side of the electric element and a crank auxiliary shaft on the side of the non-electric element, at least a rolling bearing is arranged on the main shaft of the crank, and a part of the piston side portion of the connecting rod is inserted into the cylinder. Since the notch is formed, the assembling workability is improved, the reliability is not lowered, and the compressor can be downsized.

Further, by providing the notch on the rotation direction side of the crankshaft, it is possible to further prevent deterioration of reliability.

[Brief description of drawings]

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

FIG. 2 is an inset view of the cylinder and body of the compressor in the first embodiment of the present invention.

FIG. 3 is a perspective view of a cylinder portion of the compressor according to the first embodiment of the present invention.

FIG. 4 is an inset view of a cylinder and a body of a compressor according to a second embodiment of the present invention.

FIG. 5 is a perspective view of a cylinder portion of a compressor according to a second embodiment of the present invention.

FIG. 6 is a side sectional view of a conventional compressor.

[Explanation of symbols]

 1 Airtight container 2 Electric element 3 Compression element 6 Crankshaft 8, 9 Ball bearing 15 Connecting rod 15a Body 22 Cylinder 25 Notch 30 Notch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiko Osaka 3-22, Takaidahondori, Higashiosaka-shi, Osaka Prefecture Matsushita Refrigerating Machinery Co., Ltd.

Claims (3)

[Claims] 1. An electric element and a compression element elastically supported in a closed container, a crankshaft fixed to a rotor of the electric element, an eccentric shaft provided on the crankshaft, and one end of the eccentric shaft. The connecting rod includes a connecting rod that fits and has the other end connected to a piston, and a cylinder on which the piston slides. The connecting rod is divided into two parts at a portion that fits with the eccentric shaft, and the crankshaft has the eccentricity. A crank main shaft is provided on the electric element side and a crank auxiliary shaft is provided on the opposite electric element side with respect to the axial direction of the shaft, and a rolling bearing is provided on at least the crank main shaft, and a piston side portion of the connecting rod is provided on the cylinder. A hermetically-type electric compressor having a notch into which a part is fitted. 2. The hermetic electric compressor according to claim 1, wherein a plurality of notches are provided. 3. The hermetic electric compressor according to claim 1, wherein a notch is provided on a rotation direction side of the crankshaft.