JPH029190B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a vibration damping structure in a rotary compressor used in an air conditioner or the like, and one of its objects is to improve vibration damping characteristics.

Conventionally, a vibration isolating device for a rolling piston rotary compressor of this kind has a rolling piston rotary compressor a and a shock absorber such as a spring or vibration isolating rubber attached to a base b such as a board of an air conditioner, as shown in Fig. 2. The structure was such that it was supported through c.

As is well known, in a rolling piston rotary compressor, the rotational vibration component in the longitudinal direction is significantly larger than the vibration components in other directions at its rotation frequency, and therefore the vibration torque in the longitudinal direction of the rolling piston rotary compressor is Conventional vibration isolators have been insufficient and problematic to prevent vibrations from being transmitted to the foundations of air conditioner circuit boards and the like.

The present invention has been made in view of these points,
The vibration damping performance in the rotational direction in the longitudinal direction of a rolling piston rotary compressor is particularly improved in a specific frequency range.

Hereinafter, the present invention will be explained with reference to FIG. 1 of the accompanying drawings showing one embodiment thereof.

In Fig. 1, 1 is a rolling piston type rotary compressor, 2 is a base such as a board of an air conditioner, and 3 is a buffer body that supports the rolling piston type rotary compressor 1 from the base 2, and is made of a spring coil spring, rubber, etc. It is configured. Reference numeral 5 denotes an additional inertia body attached to the lower surface of the rolling piston type rotary compressor 1, which is made of metal or the like, and is attached via a buffer body 4 made of a spring coil spring, rubber, or the like.

In the above configuration, the weight is approximately 15 kg, the diameter is approximately 125 mm,
A rolling piston rotary compressor 1 with a refrigeration capacity of about 2500 kcal/hour is used, a buffer 3 having a vertical spring constant of about 3 Kg/mm and a horizontal spring constant of about 1 Kg/mm is used as the buffer 2, As the buffer 4, the spring constant in the torsional direction is 110Kgm/
As a result of an experiment on the vibration response characteristics in the longitudinal direction of a rolling piston rotary compressor using a RAD coil spring and a steel material with a diameter of approximately 100 mm and a thickness of 55 mm as the inertia body 5, the results shown in Fig. 3 are as follows. The characteristics shown by the solid line were obtained.

(The broken line shows the conventional example.) This figure shows the transmission rate of vibration torque in the longitudinal direction of the rolling piston rotary compressor with respect to the basics.
Large attenuation is seen in the frequency range from Hz to 63Hz.
In this frequency response characteristic, especially the rotational frequency of a rolling piston rotary compressor, approximately
49Hz and approximately 57Hz are the respective fundamental frequencies when a rolling piston rotary compressor is operated at a power frequency of 50Hz and 60Hz, and because they have a large vibration force compared to other components, This is a frequency that is considered important for vibration isolation performance.

However, as is clear from Fig. 3, in this example, the vibration transmissibility decreased overall in the frequency range from 46Hz to 63Hz, and low results were obtained at 49Hz and 57Hz, which are particularly important. It was done.

That is, as in this embodiment, by attaching an additional inertial body 5 via a shock absorber 4 such as vibration isolating rubber or a spring on the vertical axis passing through the center of gravity of the rolling piston rotary compressor, vibrations can be transmitted in a specific frequency range. This will reduce the rate.

As is clear from the above embodiments, the vibration damping structure of the rotary compressor according to the present invention includes a compressor equipped with a rotary compression element and a structure in which the compressor is supported on a foundation via a vibration isolator. In terms of structure, an additional inertial body is attached to the vertical axis passing near the center of gravity of the rotary compressor via a shock absorber made of anti-vibration rubber or springs, etc. This structure reduces the vibration transmission rate to the foundation of the compressor. It has various advantages, such as a reduction in vibration, an even more effective vibration damping effect, and an extremely simple configuration.

[Brief explanation of drawings]

1A and 1B are a side view and a plan view, respectively, of a rolling piston type rotary compressor equipped with a vibration damping structure according to an embodiment of the present invention;
Figures A and B are a side view and a plan view, respectively, of a rolling piston rotary compressor equipped with a vibration damping structure showing a conventional example, and Figure 3 is a comparative characteristic diagram of vibration transmissibility between this example and a conventional vibration damping structure. It is. 1...Rolling piston type rotary compressor, 2...Foundation, 3...Buffer body, 4...Buffer body,
5...Additional inertia body.

Claims (1)

[Claims] 1. A vibration damping structure consisting of a compressor 1 equipped with a rotary compression element and a structure in which the compressor 1 is supported on a foundation 2 via a vibration isolator 3.
A vibration damping structure for a rotary compressor in which an additional inertial body 5 is attached to the lower part of the compressor 1 on a vertical axis passing near the center of gravity of the rotary compressor via a shock absorber 4 made of anti-vibration rubber or a spring.