JPS58187635A - Antivibration device of electrically-operated enclosed compressor - Google Patents

Abstract

PURPOSE:To enable to miniaturize the compressor and at the same time reduce the vibration and noise thereof by a structure wherein leg parts fixed to the bottom part of the compression main body are supported by elastic vibration insulators and at the same time dynamic vibration absorbers comprising supporting a weight by means of an elastic support fixed onto the leg part are provided. CONSTITUTION:The compressor is rotated at a rotational frequency a little lower than the frequency of power source and large vibration is excited at said frequency. However, because the dynamic vibration absorbers 5, the primary natural resonance frequency of which is made coincide with the rotational frequency of the compressor or the frequency of power source, are installed at the leg parts 2, the dynamic vibration absorbers 5 vibrate with a phase opposite to the vibration of the compressor. Accordingly, the dynamic vibration absorbers 5 supply reaction torques to the compressor main body 1 at the installation positions of the leg parts 2 through the elastic supports 5b and the leg parts 2. As a result, the torque due to the vibration of the compressor and the torque supplied by the dynamic vibration absorber 5 deaden each other, resulting in effectively reducing the overall vibration of the compressor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolator for a hermetic electric compressor, and in order to reduce vibrations generated by the compressor itself, a dynamic vibration absorber is installed in the legs of the compressor. The purpose is to downsize the compressor and effectively reduce the vibration and noise of the compressor.

In conventional hermetic electric compressors, the vibrations generated by the compressor are transmitted to the substrate supporting the compressor, which excites vibrations in the outer box that protects them, and at the same time This had the disadvantage that it excited extremely large vibrations in the pipes connected to the machine, inducing loud vibration noise.

The present invention eliminates the above-mentioned conventional drawbacks and reduces vibrations in hermetic electric compressors.

As a structure for this purpose, the present invention includes legs fixed to the bottom of the compressor and elastic vibration isolators that support the compressor in vibration isolation using the legs. A dynamic vibration absorber is formed from a weight and an elastic support having a weight at one end and the other end fixed to the leg, and this dynamic vibration absorber is installed on the leg. , the present invention will be described with reference to the accompanying drawings showing one embodiment thereof.

In the figure, 1 is a motor part and a compressor part driven by this motor part (both not shown) in a closed container.
This is a hermetic electric compressor body with a built-in. Reference numeral 2 denotes a leg fixed to the bottom of the compressor main body 1, and vibration-proof support is provided on the base plate 4 via a vibration-proof support member 3 on the lower surface of the leg 2. Reference numeral 5 denotes a dynamic vibration absorber, which is composed of a weight 5a made of a material with a large mass such as iron or lead, and an elastic support 6b made of a metal material or rubber material having appropriate hardness and elasticity. Still, this dynamic vibration absorber 6 has one end of the elastic support 5b fixed to the compressor leg 2 by brazing or press fitting, and is integrated with the leg 2 into the hermetic electric compressor body 1. . This dynamic vibration absorber 5 is suitably set so that its next natural resonance frequency approximately matches the rotational frequency or power supply frequency of the compressor. Reference numeral 6 denotes a protective cover installed so as to have a gap between it and the dynamic vibration absorber 6 that the dynamic vibration absorber 5 does not hit during steady operation of the compressor.

In the above configuration, when the hermetic electric compressor main body 1 is operated, this compressor rotates at a frequency slightly lower than the power supply frequency. At this time, large vibrations are excited in the compressor at its rotational speed, and the rotary vibration absorber 6 of the compressor vibrates at the primary natural resonance frequency of the dynamic vibration absorber 6 in an opposite phase to the vibration of the compressor. Thereby, the dynamic vibration reducer 5 supplies a reaction torque to the compressor main body 1 via the leg 2 through the elastic support 6b at the installation position of the leg 2. the result,
The torque due to the vibration of the compressor and the reaction torque supplied from the dynamic vibration absorber 5 cancel each other out, so that the overall vibration of the compressor is most effectively reduced.

Moreover, since the hermetic electric compressor main body 1 has a dynamic vibration absorber 5 installed on the upper surface of the leg 2 and is protected by a protective cover 6, there are almost no changes in appearance. There is no need for the installation space of the hermetic electric compressor to increase due to the installation of the hermetic electric compressor.

In addition, the dynamic vibration absorber 6 must be able to vibrate sufficiently and have only a small gap between it and the protective cover 6, so that when the hermetic electric compressor 1 is dropped or transported, a large force is applied to the dynamic vibration absorber 5. Even when a large amplitude occurs due to the addition of
limit the range of movement. Therefore, it is possible to prevent the elastic support 5b of the dynamic vibration absorber 6 from cracking due to excessive bending stress when the hermetic electric compressor 1 is transported or dropped.

As described above, the vibration isolating device for a hermetic electric compressor of the present invention consists of legs fixed to the bottom of the compressor body and an elastic vibration isolator that elastically supports the compressor by the legs. A dynamic vibration absorber that forms a support structure and consists of a weight having an appropriate mass and an elastic support with the weight attached to one end is installed on the compressor leg and a protective cover is provided. Compared to conventional hermetic electric compressors, it has the advantage of having almost no protruding parts to the outside, making it possible to reduce vibration and noise while maintaining the same size and installation space. be.

[Brief explanation of drawings]

The figure is an enlarged cross-sectional view of the vicinity of the legs of a hermetic electric compressor equipped with a vibration isolator according to an embodiment of the present invention, 1... Main body of the hermetic electric compressor, 2...・・・
Legs, 3...μh vibration support material, 6...dynamic vibration absorber, 6a/old weight, 6b...elastic support.

Claims (1)

[Claims] A leg section fixed to the bottom of the compressor body and an elastic vibration isolator that supports the compressor with vibration isolation are provided, and a weight having an appropriate mass and this weight attached to one end are provided. and an elastic support whose other end is fixed to the leg, forming a dynamic vibration absorber, and the dynamic vibration absorber is installed on the leg.