JPH0133826Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to the improvement of a hermetic electric compressor, and in particular:
The present invention relates to a hermetic electric compressor in which a main body of the electric compressor is elastically supported within a hermetic container by a helical spring.

(B) Prior Art Generally, this type of hermetic electric compressor is constructed by elastically supporting the electric compressor main body within a hermetic container with a helical spring. More specifically, the compressor has one end of a helical spring connected to a support protrusion formed on the frame of the electric compressor main body, and the other end connected to a support protrusion formed on a support fitting attached to an airtight container. The elastic effect of the helical spring prevents vibrations during operation from being transmitted to the outside.

(c) Problems to be solved by the invention However, according to the above configuration, since the helical spring and the supporting protrusion are in metal-to-metal contact, the vibrations of the electric compressor main body are transmitted through the helical spring to the closed container. However, sufficient attention was not paid to the vibration-proofing effect, and noise still continued to be generated. In addition, when the compressor body is displaced in the rotational direction, such as when starting up the compressor, large torsional stress acts on the helical spring, causing buckling and deformation of the spring and reducing its durability. It was hot.

This proposal was developed in consideration of these points, and aims to reduce noise by suppressing the vibrations transmitted from the compressor body to the sealed container, as well as to alleviate the torsional stress applied to the helical spring when starting the compressor, etc. The purpose of the present invention is to provide a hermetic electric compressor that can improve the durability of the compressor.

(d) Means for solving the problem The present invention consists of an electric compressor main body housed in a closed container, and an upper support protrusion provided on the main body and a lower support protrusion provided on the side of the closed container. and,
In a hermetic electric compressor, the electric compressor main body is elastically supported by a tightly wound part at the upper and lower ends of the tightly wound part by a helical spring inserted into both the supporting protrusions, Between the upper support protrusion and the helical spring, there is provided a flange having a diameter larger than the outer diameter of the upper tightly wound part of the helical spring and on which the electric compressor main body comes into contact with the upper surface, and a flange having a diameter larger than the outer diameter of the upper tightly wound part of the helical spring; A bushing is installed in which a cylindrical part that is shorter than the length of the helical spring and is press-fitted into the upper tightly wound part of the helical spring, and a cylindrical hole that is larger in diameter than the outer diameter of the upper support protrusion are integrally formed of synthetic resin. That is.

(E) Effect The hermetic electric compressor of the present invention has the above-mentioned configuration.
It prevents metal contact between the helical spring and the compressor body (including the upper support protrusion), suppresses vibrations transmitted from the compressor body to the sealed container, and reduces noise. When the machine body is displaced in the rotational direction, the torsional stress applied to the helical spring can be alleviated by the gap formed between the upper support protrusion and the bush and the self-lubricating action of the bush. The durability of the compressor can be improved by suppressing buckling and deformation. In addition, by press-fitting the bush into the helical spring, the bush and the helical spring can be made into one part, improving assembly workability, and by eliminating contact between the bush and the lower support protrusion, the bush can be easily moved during compressor transport. This has practical effects such as preventing damage.

(F) Examples The present invention will be explained below based on examples shown in the drawings.

1 is an electric compressor main body 6 formed by connecting a compression element 3 and an electric element 4 provided above and below a frame 2 by a rotating shaft 5, and is mounted in a spherical sealed container 7 by a helical spring 8.
This is a hermetic electric compressor configured with point support.
Here, the helical spring 8 is configured to have closely wound portions 8a and 8b molded with different diameters at both ends, respectively. The compression element 3 includes a sill 9 and a piston 11 that is connected to the crank portion 5a of the rotating shaft 5 via a slider 10 and reciprocates in a direction perpendicular to the axial direction of the rotating shaft 5. It is attached to a mounting part 23 formed on the frame body 2 having a bearing part 21 of the rotating shaft 5 and an upper support protrusion part 22 of the helical spring 8. The electric element 4 includes a rotor 12 press-fitted into the rotating shaft 5;
The stator 14 is equipped with a stator winding 13. The upper coil end 131 of the stator winding 13 is formed into a pair of high stage side 131a and low stage side 131b with different heights, and the compression element 3 is placed on the upper coil end 131b of the low stage side.
The structure is such that the 15 is a helical spring 8
The support plate 15 is attached to the stator 14 on the high stage side 131a of the upper coil end 131 formed at different heights. 17 is attached to the inner wall of the airtight container 7 and is attached to the lower tightly wound portion 8 of the helical spring 8.
This is a support metal fitting having a lower support protrusion 18 that fits into the lower part b.

Numeral 19 is a bush made of PBT (polybutylene terephthalate) fitted to the upper tightly wound portion 8a on the large diameter side of the helical spring 8.
The bush 19 is formed on the frame body 2 and the support plate 15, respectively, a flange portion 19a that regulates the fitting position of the tightly wound portion 8a on the large diameter side, a cylindrical portion 19b into which the tightly wound portion 8a is fitted. It is comprised of a cylindrical hole 19c into which the upper support projections 22 and 16 are loosely inserted.

In the hermetic electric compressor configured in this manner, the cylindrical portion 19b is fitted to the tightly wound portion 8a on the large diameter side of the helical spring 8 while regulating the fitting position with the collar portion 19a.
The upper support projection 16 of the support plate 15 and the upper support projection 22 of the frame body 2 are inserted into the bush 19 in a loosely fitted manner, so that the helical spring 8 and the upper support projection 16 and This not only prevents metal contact with the electric compressor body 6 from being transmitted to the airtight container 7 during operation of the electric compressor body 6 and reduces noise, but also prevents the compressor body 6 from rotating in the direction of rotation when starting the compressor, etc. When the upper support protrusion 22
The gap formed between the bushing 19 and the bushing 19 and the self-lubricating action of the bushing 19 on the contact surface between the bushing 19 and the compressor main body 6 can relieve the torsional stress applied to the helical spring 8. 8
The durability of the compressor can be improved by suppressing buckling and deformation of the compressor.

Furthermore, since the cylindrical portion 19b of the bushing 19 is tightly press-fitted into the upper tightly wound portion 8a of the helical spring 8, when assembling the compressor, the helical spring 8 into which the bushing 19 is fitted is assembled as one component. Moreover, since the cylindrical hole 19c of the bush 19 is loosely inserted into the upper support protrusion 16, the helical spring 8 having the bush 19 integrally can be easily inserted into the helical spring 8 when assembling the compressor. The upper support projection 16 of the compressor main body 6 can be easily inserted into the spring 8 in the state that the spring 8 is inserted into the lower support projection 18.
From these things, assembly workability can be improved. Furthermore, since the bush 19 is formed shorter than the upper support protrusion 16, the upper support protrusion 16 and the lower support protrusion 18 collide with each other during large vertical vibrations of the compressor main body 6, such as during rotation of the compressor. Even if the bush 19 does not hit the lower support protrusion 18, the lower support protrusion 16, 18
Push 19 without impairing the stopper action between the two
It can prevent damage to itself.

(g) Effects of the invention As described above, according to this invention, metal contact between the helical spring and the upper support protrusion is prevented, and vibrations of the compressor main body are less likely to be transmitted to the airtight container during compressor operation. This not only reduces compressor noise, but also reduces the gap formed between the upper support protrusion and the bushing and the self-lubrication of the bushing when the compressor body is displaced in the rotational direction, such as when starting the compressor. Through this action, torsional stress applied to the helical spring can be alleviated, and buckling and deformation of the spring can be suppressed, thereby improving the durability of the compressor. In addition, by press-fitting the bush into the helical spring, the bush and the helical spring can be made into one part, improving assembly workability, and by eliminating contact between the bush and the lower support protrusion, the bush can be easily moved during compressor transport. This has practical effects such as preventing damage.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a hermetic electric compressor showing an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part of a spring support portion in FIG. 1. DESCRIPTION OF SYMBOLS 1... Sealed electric compressor, 6... Electric compressor main body, 7... Sealed container, 8... Helical spring, 8a,
8b... Tightly wound part, 16, 22, 22... Upper support protrusion, 19... Bush, 19a... Flange part,
19b...Cylindrical portion, 19c...Cylindrical hole.

Claims (1)

[Scope of utility model registration request] The electric compressor body is housed in a sealed container.
An upper support protrusion provided on the main body, a lower support protrusion provided on the closed container side, and a tightly wound part at the upper and lower ends thereof, and the tightly wound part is inserted into the both support protrusions. In the hermetic electric compressor that elastically supports the electric compressor main body with a shaped spring, an outer part of the upper tightly wound part of the helical spring is disposed between the upper support protrusion and the helical spring. a flange portion having a diameter larger than the diameter of the electric compressor body and on which the electric compressor main body abuts; a cylindrical portion shorter than the length of the upper support protrusion and press-fitted into the upper tightly wound portion of the helical spring; and an upper support protrusion. A hermetic electric compressor is equipped with a bush integrally formed of synthetic resin with a cylindrical hole having a diameter larger than the outer diameter of the part.