JPS6349077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a totally hermetic electric compressor, and particularly to a totally hermetic electric compressor suitable for noise reduction.

[Conventional technology]

A conventional hermetic electric compressor will be explained with reference to FIG. FIG. 1 is a longitudinal sectional view of a completely hermetic electric compressor.

In the figure, a compressor main body 2 is housed inside a closed container 1 by a coil spring support device 3. The compressor main body 2 has a frame 4 as its core, an electric motor section 5 at the bottom, a compressor section 6 at the top, and a rotating shaft 7 connecting these sections. 8 is a discharge pipe provided in the compressor section 6. On the other hand, this type of compressor converts the rotational motion of the electric motor section 5 into reciprocating motion and compresses gas intermittently, so that noise and vibration are generated from the compressor body 2. This noise vibration is transmitted to the closed container 1 by gas propagation and solid propagation, and is finally expressed as noise as the closed container 1 vibrates. Here, the solid propagation includes one that passes through the coil spring support device 3 and one that passes through the discharge pipe 8, and the one that passes through the coil spring support device 3 is quite noisy. FIG. 2 shows the noise spectrum when the spring constant K of the coil spring support device 3 in a conventional fully hermetic electric compressor is changed, and it can be seen that the smaller the spring constant K, the lower the noise. FIG. 3 is a partial cross-sectional view of a conventional coil spring support device. The coil spring support device 3 consists of a coil spring 3a, a spring seat 3b, and a support body 3e that is integrated with a stopper portion 3c that restricts the lateral movement of the frame 4 during transportation of the compressor. The support body 3e is welded to the closed container 1.

In the above conventional technology, an inertial force F acts on the frame 4 when starting and stopping the compressor, and the compressor main body 2
moves in the lateral direction, but if the coil spring 3a is soft, the frame 4 and the stopper part 3c will collide and a considerable impact noise will be generated. Therefore, in this type of compressor used in home refrigerators, etc., collisions are not possible. I needed to avoid it. However, in the limited space of the sealed container 1, the spring stiffness in the vertical direction and the stiffness in the lateral direction are proportional to each other due to the characteristics of the spring, so the coil spring constant K of the compressor is small as shown in Figure 2. Even if the noise characteristics were better, a stiffer coil spring with a somewhat higher spring constant was unavoidably required to prevent collisions during starting and stopping.

There is a means shown in FIG. 4 as a means for solving the problems of the prior art. FIG. 4 is a partial sectional view of the coil spring support device.

In the figure, 9 is a linear spring steel wire of arbitrary diameter, and one end is fixed to the spring seat 3b. By appropriately changing the diameter of the spring steel wire 9, any strength against the inertial force f can be obtained. On the other hand, in the hole 4a of the frame 4, a damping member 10 made of an elastic material such as rubber or resin is disposed at the center of the spring receiving portion. This damping member 10
A hole 10a with a diameter slightly smaller than the diameter of the spring steel wire 9 is made in the center of the spring steel wire 9, and at the same time the coil spring 3a is assembled into the compressor body 2 and the coil spring support device 3, the spring steel wire 9 is inserted into the hole 10a of the damping part 10. It is made by inserting it into.

As a result, the spring strength in the lateral direction is the coil spring 3
a and the spring steel wire 9, and the vertical spring strength is determined by the spring constant of the coil spring 3a, and by applying appropriate friction between the damping part 10 and the spring steel wire 9. As a seed pot, it has the effect of damping vibrations and can reduce the transmission rate of vibrations.

Incidentally, as related to this type of conventional technology, for example, Japanese Utility Model Application Publication No. 50-31508 can be mentioned.

[Problem that the invention seeks to solve]

In the above conventional technology, since the end of the damping member that contacts the spring steel wire has an acute angle, stress is concentrated at the part that contacts the acute angle of the spring steel wire, and there is a risk that the spring steel wire may be damaged. .

An object of the present invention is to provide a completely hermetic electric compressor that prevents stress concentration on spring steel wires.

[Means for solving problems]

The above purpose is to provide a support body installed in a sealed container, a spring seat provided on the support body, a coil spring with one end attached to the spring seat, and the other end of the coil spring housed in the sealed container. In a completely hermetic electric compressor attached to a frame of a compressor main body, a first hole provided in the frame;
It consists of a damping member made of rubber or resin, etc., provided in the first hole, a second hole provided in the damping member, and a spring steel wire, one end of which is inserted into the second hole. This is achieved by supporting the other end of the spring steel wire on the spring seat and making the second hole R-shaped.

[Effect]

Since the hole of the damping member is R-shaped,
Stress is not concentrated on the spring steel wire. This can prevent damage to the spring steel wire.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

FIG. 5 is a sectional view of essential parts of the frame and support device.

In the figure, 4 is a frame. This frame 4 is provided with a damping member 10 made of an elastic material such as rubber or resin. 10a is a hole provided in the center of the damping member 10.

The end of the hole 10a is rounded.
A spring steel wire 9 is inserted into the hole 10a. 3b is a spring seat, which is provided on the coil spring support device 3.

According to this embodiment, the hole 1 of the damping member 10
Since the end portion of 0a is rounded, stress is not concentrated on the spring steel wire 9 and the spring steel wire is not damaged. In addition, low noise can be achieved by using the spring steel wire and the damping member.

〔Effect of the invention〕

According to the present invention, it is possible to provide a completely hermetic electric compressor that has low noise and prevents stress concentration on the spring steel wire.

[Brief explanation of drawings]

The first is a longitudinal cross-sectional view of a conventional fully hermetic electric compressor.
Figure 2 is a graph showing the relationship between the spring constant of a coil spring and the noise level in a conventional compressor, Figures 3 and 4 are cross-sectional views of a conventional coil spring support device, and Figure 5 is a coil spring support equipped with the present invention. FIG. 2 is a cross-sectional view of the device. 1... Sealed container, 2... Compressor main body, 3... Conventional coil spring support structure, 3a... Coil spring,
3b... Spring seat, 3c... Stopper part, 3e...
Support body, 4... Frame, 4a... Frame hole, 5... Electric motor, 6... Compression mechanism section, 7... Rotating shaft, 8... Discharge pipe, 9... Spring steel wire, 4a
... Frame hole, 10 ... Damping part, 10
a...hole.

Claims (1)

[Claims] 1. A support body installed in a sealed container, a spring seat provided on the support body, a coil spring with one end attached to the spring seat, and a compressor body with the other end of the coil spring housed in the sealed container. In a completely hermetic electric compressor installed in a frame, a first hole provided in the frame, a damping member made of rubber or resin, etc. provided in the first hole, and a damping member provided in the damping member made of rubber or resin, etc. It consists of a second hole and a spring steel wire with one end inserted into the second hole, the other end of the spring steel wire is supported in the spring seat, and the second hole is R-shaped. A completely hermetic electric compressor featuring: