JPS63134872A - Sealed type compressor - Google Patents

Abstract

PURPOSE:To reduce the sliding loss by positioning and fixing two ball bearings at the position where balls are compressed. CONSTITUTION:The inner races of a lower ball bearing 22 and an upper bearing 23 are press-fitted into a crank 2 having a step difference for positioning. The outer races of the ball bearings 22 and 23 are loose-fitted onto a bearing 24 having a positioning step difference. Further, a wave-shaped molded leaf spring 25 is installed in the thrust direction between the outer frame 22a of the ball bearing 22 and a bearing 24, and the ball bearing 23 is press-fitted into a crank 21 so that the leaf spring 25 is set at the compressed position. Further, a sleeve press-fitted onto the crank 21 is press-fitted and fixed for preventing the slip-off of the ball bearing 23. With such constitution, the sliding loss of the bearing can be reduced.

Description

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

BACKGROUND ART In recent years, hermetic compressors (hereinafter referred to as compressors) are required to have higher compression efficiency from the viewpoint of improving energy efficiency. Compressors have become highly efficient and have reached a high level, but we must continue to improve efficiency even further.

An example of a conventional compressor will be described below with reference to the drawings. FIG. 2 shows a cross-sectional view of a conventional compressor. In FIG. 2, a compression element 2 and an electric element 3 are elastically supported in a closed container 1, and a crank 6 is press-fitted into a rotor 4 of the electric element 3 with a thrust washer 8 sandwiched therebetween. The crank 6 is a block 7
It is pivotally supported by a journal bearing 9 fixed with a bolt 8. 1o is a funrond, and 11 is a piston.

The operation of the compressor configured as described above will be explained below. First, the rotor 4 of the electric element 3 rotates, and the crank 6 fixed to the rotor 4 rotates, causing the piston 11 to reciprocate via the connecting rod 1o and compressing the gas. At this time, the crank 6
The radial load of rotation (direction perpendicular to the rotational axis) is received by the inner surface of the journal bearing 9, and the thrust load is received between the thrust washer 6 and the journal bearing 9.

Problems to be Solved by the Invention However, in the above configuration, since the rotation of the crank 6 is received by the journal bearing 9 as sliding, there is a problem that the sliding loss is large and the efficiency of the compressor is reduced. Was.

In view of the above problems, the present invention provides a highly efficient compressor with less sliding loss in the bearing portion.

Means for Solving the Problems In order to solve the above problems, the compressor of the present invention includes a bearing that pivotally supports the crank via two ball bearings;
A plate spring or a coil spring is provided between the bearing and one of the ball bearing outer frames in the thrust direction, and the two ball bearings are positioned and fixed at a position where the spring is compressed.

Function: With the above-described configuration, the bearing portion of the present invention changes from sliding to rolling, thereby reducing sliding loss and realizing a compressor with higher efficiency.

EXAMPLE Hereinafter, a compressor according to an example of the present invention will be described with reference to the drawings. FIG. 1 shows a sectional view of a compressor according to an embodiment of the present invention. In addition, the same as the conventional example,
The same reference numerals will be given and the explanation will be omitted. In FIG. 1, the inner rings of the ball bearing 22 on the lower side in the direction of gravity and the ball bearing 23 on the upper side in the direction of gravity are both press-fitted into a crank 21 having a step for positioning the ball bearing 22 and the ball bearing 2.3, The outer rings of the ball bearings 22 and 23 are also fitted with a clearance into a bearing 24 provided with a step for positioning the ball bearings 22 and 23. Outer frame 2 of the ball bearing 22 below in the gravity direction
A plate spring 26 formed into a wave shape is provided between the bearing 2a and the bearing 24 in the thrust direction.
1, and a sleeve which is also press-fitted to the crank 21 is press-fitted to prevent the ball bearing 23 from coming out.

The operation of the compressor configured as above will be explained below using FIG. 1. Crank 21 and ball bearing 22. Since the ball bearing 23 is press-fitted, it does not slip but reliably rolls to generate friction and reduce sliding loss. In addition, the spring force of the leaf spring 26 applies loads in opposite directions to the ball bearings 22 and 23, and since the outer rings of the two ball bearings 22 and 23 are fitted with a clearance, the loads are equalized and the rolling motion becomes stable. Furthermore, by inserting a leaf spring 26 between the outer frame 22a of the ball bearing 22 and the bearing 24 in the lower direction of gravity, the crank 21
, the weight of the rotor 4 is equal to the weight of the two ball bearings 22.
．． There is little influence on the load applied to 23, and the rolling motion becomes stable.

As described above, according to this embodiment, the bearing 24 is pivotally supported via the two ball bearings 22 and 23, and the bearing 2
4 and the outer frame 22a of the ball bearing 22 below in the direction of gravity.
a plate spring 25 is provided between the plate springs 2 in the thrust direction;
5, said two ball bearings 22.
23 is positioned and fixed, and the inner rings of the two ball bearings 22 and 23 are both connected to the crank 2.
The two ball bearings 22.
The three rollers make the movement smooth, stable and reduce sliding loss, making it possible to realize a compressor with higher efficiency.

Effects of the Invention As described above, the present invention includes a bearing that pivotally supports the crank via two ball bearings, and a leaf spring or a coil spring between the bearing and one of the ball bearing outer frames in the thrust direction. By providing a configuration in which the two ball bearings are positioned and fixed at the position where the spring is compressed, it is possible to stably reduce sliding loss and provide a highly efficient compressor.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a hermetic compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional hermetic compressor. 1... Airtight container, 2... Compression element, 3
...Electric element, 4...Rotor, 21.
...Crank, 22゜23 ...Ball bearing, 22a ...Outer frame, 24 ...
Bearing, 25... leaf spring. Name of agent: Patent attorney Satoshi Nakao and 1 other person 24-11 komauke 2s ---'tr and spring/I'-

Claims (3)

[Claims] (1) A compression element and an electric element that are elastically supported in a sealed container, a crank fixed to the rotor of the electric element, a bearing that pivotally supports the crank via two ball bearings, and the A hermetic compressor, characterized in that a plate spring or a coil spring is provided between the bearing and one of the ball bearing outer frames in the thrust direction, and the two ball bearings are positioned and fixed at a position where the spring is compressed. (2) The hermetic compressor according to claim 1, wherein the ball bearing and the crank are press-fitted, and the ball bearing and the bearing are loosely fitted in a radial direction. (3) The hermetic compressor according to claim 1, wherein the spring is located between a ball bearing and a bearing below in the direction of gravity.