JPH0544777A - Vibration absorber - Google Patents

Abstract

PURPOSE:To absorb both low and high frequency vibrations as well as to reduce a noise produced by these vibrations. CONSTITUTION:A first elastic body, absorbing a high frequency vibration, a second elastic body smaller in an elastic modulus than the first elastic body and a weight are stacked in this order. For example, damping rubber 1, VD foam 2 and hard rubber 3 are stuck together in this order, constituting it, and then this composition is stuck to a vibration source such as a compressor or the like at the damping rubber side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration absorbing device used for a vibration source such as an air conditioner or a compressor of a refrigerator.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional vibration absorber comprises a dynamic vibration absorber composed of an elastic body 32 made of soft urethane foam, soft rubber or the like and a weight 33. As shown in FIG. 4, it is directly attached to the surface of the compressor body 4 and the surface of the accumulator 5.

[0003]

Generally, the vibration source is
A relatively low frequency vibration, which is a shaking vibration of the vibration source body, and a relatively high frequency vibration, which is a film vibration on the surface of the vibration source body, are generated. For example, in the case of the above-mentioned compressor, relatively low-frequency vibration that is shaking vibration of the entire compressor, the surface of the compressor body 4 and the accumulator 5
Vibration of a relatively high frequency, which is film vibration of the surface, is generated.

However, in the conventional vibration absorber composed of the dynamic vibration absorber, the elastic body 32 functions as a so-called spring, and the material is selected so as to have a constant elastic coefficient corresponding to the set value of the resonance frequency of the dynamic vibration absorber. To be done. Therefore, it is not possible to simultaneously absorb two types of vibrations with different frequencies as described above,
It absorbs only relatively low frequency vibrations. Therefore, the conventional vibration absorber does not absorb high-frequency vibrations, and the effect of reducing vibrations and noise due to vibrations is not sufficient.

Therefore, the present invention provides a vibration absorbing device capable of absorbing both low-frequency vibrations and high-frequency vibrations, thereby reducing the vibration of the vibration source and reducing the noise from the vibration source. The purpose is to do.

[0006]

In the vibration absorbing device of the present invention, a first elastic body absorbing high frequency vibration, a second elastic body having a smaller elastic coefficient than the first elastic body, and a weight are laminated in this order. It is characterized by being done.

The material of the first elastic body is determined and selected so that a large vibration loss coefficient can be obtained at a relatively high frequency of vibration to be absorbed, and the material of the second elastic body is selected. The modulus of elasticity and the weight of the weight are selected so that their resonant frequency approaches the frequency of low frequency vibrations. Further, the first elastic body may be formed by laminating, and the number of laminating is determined according to the number of kinds of vibrations to be absorbed.

[0008]

In the vibration absorbing device of the present invention, the first elastic body is attached to the vibration source so that the first elastic body absorbs the vibration of relatively high frequency and the second elastic body is connected to the weight. The second elastic body and the weight act so as to absorb a vibration having a relatively low frequency.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional structural view of a vibration absorbing device according to an embodiment of the present invention used in a compressor, and FIG. 2 is a view in which this vibration absorbing device is attached to a compressor. In the figure, 1 is a damping rubber, and the elastic coefficient and the mass are adjusted so that the frequency of high-frequency membrane vibration on the surface of the compressor body 4 and the surface of the accumulator 2 and the frequency at which the vibration loss coefficient of the damping rubber 1 becomes maximum match. Is also selected in consideration of the influence of the temperature change of the compressor body 4 and the like. 2 is a VD foam (a sponge made of urethane foam) selected so as to have an elastic coefficient that absorbs the vibration of the entire compressor together with the weight, and 3 is a material that absorbs the vibration of the entire compressor together with the VD foam. It is a hard rubber that becomes the selected weight, and at the same time has a sound insulation effect. The VD foam 2 and the hard rubber 3 are selected so that the resonance frequency matches the vibration frequency of the compressor. And these are pasted in this order.

This vibration absorbing device is attached to the surfaces of the compressor body 4 and the accumulator 5 on the side of the vibration damping rubber 1. By attaching this vibration absorbing device, the vibration damping rubber 1 absorbs the film vibration of the compressor surface, and the VD foam 2 and the hard rubber 3 absorb the vibration of the entire compressor. As a result, the vibration of the compressor is wider in a wider frequency range than conventional. Vibrations can be absorbed and reduced efficiently, and at the same time, noise accompanying vibrations has been reduced. The frequency range of the absorbed vibration can be changed by appropriately selecting the vibration loss characteristic of the first elastic body, the elastic coefficient of the second elastic body, and the weight of the weight.

[0011]

By using the vibration absorbing device of the present invention, it is possible to absorb both low-frequency vibrations and high-frequency vibrations, thereby reducing the vibrations of the vibration source and reducing the noises from the vibration source. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional structure diagram of a vibration absorbing device according to an embodiment of the present invention.

FIG. 2 is a diagram in which the vibration absorbing device of the embodiment is attached to a compressor.

FIG. 3 is a sectional structural view of a conventional vibration absorbing device.

FIG. 4 is a diagram in which a conventional vibration absorbing device is attached to a compressor.

[Explanation of symbols]

1. ． ． Damping rubber 2. ． ． VD form
3. ． ． Hard rubber 4. ． ． Compressor body 5. ． ． accumulator

Claims (1)

[Claims] 1. A vibration absorbing device comprising a first elastic body that absorbs high-frequency vibration, a second elastic body having a smaller elastic coefficient than the first elastic body, and a weight, which are stacked in this order.