JPH06264868A - Sealed compressor - Google Patents

Abstract

PURPOSE:To provide a sealed compressor used for the refrigerating cycle of a refrigerator, requiring a low input, and having high reliability. CONSTITUTION:A sealed container 21 stores an electric element 22 and a compression element 23. A crank shaft 24 has an eccentric section 25, and an upper bearing 26 and a lower bearing 27 are arranged above and below the eccentric section 25. A holder 28a has a thick section 28c over the whole periphery of a bearing holding section 28b, it is fixed to the compression element 23 via the fixing sections 28d, 28e on a cylinder 29 side and a fixing section on the compression stroke side according to the rotating direction of the crank shaft 24, and the center surface 32 perpendicular to the axial direction 31 of the upper bearing 26 is formed on the upper side of the axial direction 31 against a plane 30 formed by the fixing sections 28d, 28e.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in a refrigerating cycle such as a refrigerator-freezer.

[0002]

2. Description of the Related Art In recent years, a hermetic compressor has been required to have high efficiency from the viewpoint of improving energy efficiency. Although the efficiency of hermetic compressors has advanced to a high level, it is necessary to achieve even higher efficiency.

An example of a conventional hermetic compressor will be described below with reference to the drawings. FIG. 4 shows Japanese Patent Laid-Open No. 63-51.
It is a side sectional view of the hermetic compressor shown in Japanese Patent No. 86. 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 crankshaft 6 fitted to the rotor 5.

Ball bear links 7 and 8 are attached to the upper and lower ends of a bearing 9 that supports the crank spindle 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.

In the hermetic compressor constructed as described above, when the hermetic compressor starts to operate, the rotor 5 rotates, so that the crank spindle 6 has the ball bearings 7, 8
The piston 12 reciprocates in the cylinder 13 via the eccentric shaft 10 and the connecting rod 11 to compress the gas.

[0006]

However, in the above-mentioned structure, an eccentric load is applied to the ball bearing during operation, and twisting occurs between the eccentric shaft and the connecting rod, resulting in an increase in input and a decrease in reliability. Had.

In view of the above problems, the present invention provides a hermetic compressor with low input and high reliability.

[0008]

In order to solve the above problems, a hermetic compressor according to the present invention comprises a hermetic container, an electric element inside the hermetic container, a cylinder constituting the compression element, and the electric motor. A crankshaft having an eccentric portion driven by an element, an upper bearing and a lower bearing, which are arranged above and below the eccentric portion in the axial direction of the crankshaft, for rotatably supporting the crankshaft, and holding the upper bearing. A holder is provided, and the fixed position of the holder is on the cylinder side and the compression stroke side in the rotational direction of the crankshaft.

The bearing holding portion of the holder has a thick portion all around the circumference.

Further, the center plane of the upper bearing, which is perpendicular to the axial direction, is on the axial upper side with respect to the plane formed by the cylinder side fixing portion of the holder.

[0011]

According to the present invention, since the distortion of the upper bearing due to the load can be reduced by the above structure, the twisting of the sliding portions can be reduced while maintaining the squareness of the cylinder and the crankshaft.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A hermetic compressor according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional view of a hermetic compressor showing an embodiment of the present invention, and FIG. 2 is a top view of the same embodiment. still,
The same parts as those of the conventional example will be described using the same reference numerals, and the same parts of the configuration and operation will be omitted.

In FIGS. 1 and 2, reference numeral 21 designates a closed container in which an electric element 22 and a compression element 23 are installed. Reference numeral 24 denotes a crankshaft, which has an eccentric portion 25. Reference numerals 26 and 27 respectively denote an upper bearing and a lower bearing, which are arranged above and below the eccentric portion 25. Reference numeral 28a denotes a holder, which has a thick wall portion 28c around the entire circumference of the bearing holding portion 28b, and has a cylinder 29
The fixed portions 28d and 28e on the side and the fixed portion 28f on the compression stroke side are fixed to the compression element 23 according to the rotation direction of the crankshaft 24, and the flat surface 3 formed by the fixed portions 28d and 28e.
The center plane 3 perpendicular to the axial direction 31 of the upper bearing 26 with respect to 0
2 is on the top.

According to the hermetic compressor constructed as described above, the same operation as in the previous example is performed.

With the above structure, the hermetic compressor of this embodiment can reduce the distortion of the holder by receiving the force due to the load applied to the bearing during operation by the fixed portion of the holder. By providing a thick part,
The distortion can be further reduced. Regarding the moment due to the load, the distortion of the holder can be reduced by making the center plane of the upper bearing axially upward with respect to the plane formed by the fixed portion. Therefore, the perpendicularity between the cylinder and the crankshaft can be maintained, and twisting can be reduced at each sliding portion.

[0017]

As described above, according to the present invention, a crankshaft having an eccentric portion, which is driven by the closed container, the electric element provided inside the closed container, the cylinder forming the compression element, and the electric element. And an upper bearing and a lower bearing, which are arranged above and below the eccentric portion in the axial direction of the crankshaft, for rotatably supporting the crankshaft, and a holder for holding the upper bearing, and a fixed position of the holder. Can be provided on the compression stroke side in accordance with the rotation direction of the cylinder side and the crankshaft, thereby providing a hermetic compressor capable of maintaining the squareness between the cylinder and the crankshaft and reducing the input.

Further, since the center plane of the upper bearing, which is perpendicular to the axial direction, is on the upper side in the axial direction with respect to the plane formed by the cylinder side fixing portion of the holder, twisting at each sliding portion is prevented. It is possible to provide a hermetic compressor that can be made smaller and has improved reliability.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a hermetic compressor according to an embodiment of the present invention.

FIG. 2 is a top view of the same embodiment.

FIG. 3 is a side view of a conventional hermetic compressor.

[Explanation of symbols]

 21 Airtight container 22 Electric element 23 Compression element 24 Crankshaft 25 Eccentric part 26 Upper bearing 27 Lower bearing 28a Holder 28b Bearing holding part 28c Thick part 28d, 28e, 28f Fixed part 29 Cylinder 30 Plane 31 Axial direction 32 Center plane

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

Claims (3)

[Claims] 1. A hermetic container, an electric element and a compression element provided inside the hermetic container, a cylinder constituting the compression element, a crankshaft having an eccentric portion driven by the electric element, and a crankshaft of the crankshaft. An upper bearing and a lower bearing, which are axially arranged above and below the eccentric portion, for rotatably supporting the crankshaft, and a holder for holding the upper bearing, and a fixed position of the holder is a cylinder side and the crank. A hermetic compressor characterized in that the compression stroke side is set according to the rotation direction of the shaft. 2. A hermetic container, an electric element and a compression element provided in the hermetic container, a cylinder constituting the compression element, a crankshaft driven by the electric element, having a eccentric portion, and the crankshaft. An upper bearing and a lower bearing, which are arranged above and below the eccentric portion in the axial direction of the crankshaft, for rotatably supporting the crankshaft, and a holder for holding the upper bearing. A hermetic compressor, characterized in that it has a thick portion over the entire circumference of a bearing holding portion of the holder on the compression stroke side in the rotational direction of the crankshaft. 3. The method according to claim 1, wherein a center plane of the upper bearing perpendicular to the axial direction is located above the axial direction with respect to a plane formed by the cylinder side fixing portion of the holder. The hermetic compressor described.