JPH0378582A - Closed compressor - Google Patents

Abstract

PURPOSE:To obtain life reliability improvable with a load reduced in ball bearings by arranging the one ball bearing in an electric motor element side and the other opposite to the electric motor element side from an eccentric part of a crankshaft, of the two ball bearings for rotatably supporting the crankshaft. CONSTITUTION:A ball bearing 28 is inserted to a crankshaft 25 to which a thrust plate 34 is fixed by a bolt 35. Thus by arranging bearings 27 and 28 in an electric motor element side and in a side opposite thereto from an eccentric part 26 of the crankshaft 25, in a compressor, a load by reaction of a compression load of a piston 14 is almost equally received by the bearings 27 and 28. Accordingly, a load for the bearings 27 and 28 can be reduced with life reliability possible to be enhanced. While when a spring 32 is inserted between an outer frame part 31 of the bearing 28 and its bearing part 30, a thrust load of the spring 32 + dead weight force of the crankshaft 25 and a rotor 4 acts on the bearing 27 with the thrust load of the spring 32 acting on the bearing 28, and a sliding noise can be low suppressed.

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 is a cross-sectional view of a compressor disclosed in Japanese Patent Application Laid-Open No. 63-134872. A compressor element 2 and an electric element 3 are elastically supported in a closed container 1, and a crankshaft is press-fitted into a rotor 4 of the electric element 3. Further, a ball bearing 7 and a ball bearing 8 which pivotally support the crankshaft 6 and are disposed on the electric element 3 side from the eccentric portion 6 of the crankshaft 6, and the ball bearing 7
, a bearing 9 that pivotally supports the crankshaft 5 via a ball bearing 8, and a ball bearing 8 located below in the direction of gravity.
It has a spring 11 made of a plate spring' having a wave shape between the outer frame portion 1o and the bearing 9 in the thrust direction. The ball bearing 7 and the ball bearing 8 are connected to the spring 1.
A sleeve 12 is fixed to the crankshaft 5 so that the sleeve 1 is in a compressed position, and a sleeve 12 is fixed to the crankshaft 6 to prevent it from being pulled out. 13 is a connecting rod 14 is a piston.

The operation of the compressor configured as above will be explained below. First, the rotor 4 of the electric element 3 rotates, and the crankshaft 5 fixed to the rotor 4 rotates,
A piston 14 is caused to reciprocate via a connecting rod 13 to compress gas. By using ball bearings 7 and 8, sliding loss is reduced and high efficiency is achieved. In addition, by inserting the spring 11 between the outer frame 1o of the ball bearing 8 in the lower direction of gravity and the thrust direction of the bearing 9, the ball bearing 7 is subjected to the thrust load due to the spring 11 + the crankshaft 5 and the rotor 4.
, and a thrust load from the spring 11 acts on the ball bearing 8. Furthermore, the thrust load can be applied while suppressing the influence of the weight of the crankshaft 6 and rotor 4, and the sliding noise of the ball bearings 7 and 8 can be kept low.

Problems to be Solved by the Invention However, in the above configuration, since the piston 14 is supported on one side of the shaft in the compression direction (cantilevered structure), the reaction of the compressive load is caused by the action of the moment, as shown in FIG. The load acting on the ball bearing 8 with respect to W is, and the load is larger than W. Similarly, the ball bearing T is subjected to a large load.

Therefore, the life of the ball bearings 7 and 8 is shortened, and it is difficult to ensure reliability.

In view of the above problems, the present invention provides a ball bearing.

In addition to reducing the load on the ball bearing and ensuring reliability, it also reduces the sliding noise by applying the thrust load from a conventional spring to the ball bearing and ball bearing by reducing the influence of the weight of the crankshaft and rotor. The purpose of the present invention is to provide a compressor that has both suppressed effects.

Means for Solving the Problems In order to solve the above-mentioned problems, the compressor of the present invention uses at least two ball bearings that pivotally support the crankshaft, and one ball bearing is electrically connected to an eccentric part of the crankshaft. The other ball bearing is disposed on the side opposite to the electric element from the eccentric portion of the crankshaft, and a spring is provided between the outer frame portion of the ball bearing below the moving direction and the bearing portion in the thrust direction. The structure is such that it has the following characteristics.

Effect: Due to the above-described structure, the present invention can reduce the load applied to the ball bearing by about half of the reaction W of the compressive load, which can significantly reduce the applied load compared to the conventional example, and improve the life reliability of the ball bearing. To realize a compressor that has the effect of suppressing the effects of the weight of the rotor and crankshaft on the ball bearings as well as applying a thrust load from a spring and suppressing sliding noise as in the past. becomes.

EXAMPLE Hereinafter, a compressor according to an example of the present invention will be described with reference to the drawings. Note that parts that are the same as those in the conventional example are designated by the same reference numerals, and description thereof will be omitted. FIG. 1 is a sectional view of a compressor in one embodiment of the present invention.

In the figure, 26 is a crankshaft that also has a shaft on the non-electric element side of the eccentric part 26, 27.28 is a ball bearing, and 29
．． Reference numeral 30 denotes a bearing portion that pivotally supports the crankshaft 25 via the ball bearings 27 and 28. Reference numeral 31 designates an outer frame portion of the ball bearing 28 below in the gravity direction, and 32 represents a spring consisting of a wave-shaped plate spring inserted between the outer frame portion and the bearing portion 3o in the thrust direction. The connecting rod 33 is the first connecting rod 3 attached to the piston 14.
3a and a second connecting rod 3sb, which holds the crankshaft 25 together with the first connecting rod 33a, are fixed with screws 33a. In addition, Poufre Bearing 2
8 into the crankshaft 25 and insert the thrust plate 3 into the crankshaft 25.
5 is fixed to the crankshaft 26 with a port 36.

In the compressor configured as described above, the ball bearings 27 and 28 are disposed on the electric element 3 side and the non-electric element 3 side with respect to the eccentric portion 2θ of the crankshaft 26, so that the compressive load of the piston 14 is reduced. The load due to the reaction is received almost equally by the ball bearing 27 and the ball bearing 28, so that the load on the ball bearing 27 and the ball bearing 28 can be reduced, and the life reliability can be increased. In addition, by inserting the spring 32 between the outer frame 31 of the ball bearing 28 in the lower direction of gravity and the thrust direction of the bearing part 3o, the ball bearing 27 is subjected to a thrust load due to the spring 32 + rotation with the crankshaft 26. Child 4's own gravity acts,
A thrust load from the spring 32 acts on the ball bearing 28, and the crankshaft 26 and rotor 24
Thrust load can be applied to the ball bearings 27 and 28 while suppressing the influence of their own weight, and sliding noise can be suppressed.

Effects of the Invention As described above, according to the compressor of the present invention, two ball bearings pivotally support the crankshaft! By using J7'f, one ball bearing is located on the side of the electric element from the eccentric part of the crankshaft, and the other ball bearing is placed on the side opposite to the electric element from the center of the crankshaft. 1. It can reduce the applied load and increase the life reliability of the ball bearing, and
By inserting a spring between the outer frame of the ball bearing below the gravity direction and the bearing in the thrust direction, the thrust load due to the spring is applied to the ball bearing while suppressing the influence of the weight of the crankshaft and rotor. can be added, which has the effect of suppressing sliding noise.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a hermetic compressor according to an embodiment of the present invention, Fig. 2 is a sectional view of a conventional hermetic compressor, and Fig. 3 shows the load applied to the crankshaft of a conventional hermetic compressor. It is a schematic diagram. 1... Airtight container, 2... Compression element, 3
...Electric element, 4...Rotor, 26.
...Crankshaft, 26 ...Eccentric part, 27
．． 28...Ball bearing, 29.30...
... Bearing part, 31 ... Outer frame part, 32 ...
...Spring.

Claims (1)

[Claims] a compression element elastically supported in a closed container, an electric element, a crankshaft fixed to the rotor of the electric element, and an eccentric part of the crankshaft that pivotally supports the crankshaft, and a side of the electric element and the eccentricity. a ball bearing disposed on the opposite side of the electric element from the part, a bearing part that pivotally supports the crankshaft via the ball bearing, an outer frame part of the ball bearing below in the direction of gravity, and the bearing part. A hermetic compressor, comprising a spring between the two in the thrust direction, and the ball bearing is positioned and fixed at a position where the spring is compressed.