JPH0861295A - Impeller with vibration damping function - Google Patents

Abstract

PURPOSE: To prevent the occurrence of breakage through reduction of the vibration level of the main disc of an impeller by mounting a plurality of piezoelectric elements equally dividedely of a periphery on the main plate of an impeller, and connecting an electric resistor to the two plates of a distribution element. CONSTITUTION: The main disc 2 of an impeller 1 has one surface on which a plurality of vanes 3 are formed. A plurality of piezoelectric elements 4 are mounted equally dividedely of a periphery on the outer surface in a radial direction of the other surface positioned facing the vane 3 of the main disc 2. An electric resistor 6 is connected to each of the positive and negative electrodes of each piezoelectric element 4 through a lead wire 5 to form a closed circuit. Thus, vibration energy generated through rotation of the impeller 1 is converted into electric energy by the piezoelectric element 4. Converted electric energy is converted into heat by the electric resistor 6, resulting in remarkable damping of vibration energy and reduction of a vibration level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller with a vibration damping function used in blowers, compressors, pumps and the like.

[0002]

2. Description of the Related Art Resonance may occur when the natural frequency of an impeller such as a blower, a compressor, a pump, etc. matches the number of revolutions of a rotor or an integral multiple of the number of revolutions. Become.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an impeller with a vibration damping function that reduces the vibration level of the main plate of the impeller and prevents damage.

[0004]

According to the present invention, a plurality of piezoelectric elements are attached to a main plate of an impeller in a circumferentially equidistant manner, and an electric resistance is connected to the bipolar plates of the power distribution element.

[0005]

In the impeller having the vibration damping function configured as described above, the vibration energy is converted into electric energy by the piezoelectric element and further converted into heat by the resistance. Therefore, the vibration is damped and the vibration level is reduced.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a main plate 2 of an impeller 1 has a plurality of (five in the illustrated example) blades 3 formed on one surface thereof. Further, a plurality of (10 in the illustrated example) piezoelectric elements 4 are attached in a circumferentially equidistant manner on a portion radially outward of the other surface of the main plate 2 facing the blade 3. An electric resistance 6 is connected to the positive electrode and the negative electrode of each piezoelectric element 4 by a lead wire 5 to form a closed circuit. For convenience of description, the blade 3, the piezoelectric element 4, and the electric resistance 6 are provided.
Are shown on the same side of the main plate 2.

Next, the operation will be described.

Vibration energy generated by the rotation of the impeller 1 is converted into electric energy by the piezoelectric element 4. Then, the converted electric energy is further converted into heat by the electric resistance 6, and as a result, the vibration energy is greatly attenuated and the vibration level is reduced. Since most vibration energy is attenuated, the optimum resistance value can be obtained by theoretical calculation or experiment.

[0010]

Since the present invention is constructed as described above, the vibration level of the main plate of the impeller can be reduced and damage can be prevented.

[Brief description of drawings]

FIG. 1 is a front view showing a vane, a piezoelectric element, and an electric resistance, which are one embodiment of the present invention.

[Explanation of symbols]

 1 ... Impeller 2 ... Main plate 3 ... Blade 4 ... Piezoelectric element 5 ... Lead wire 6 ... Resistance

Claims (1)

[Claims] 1. An impeller with a vibration damping function, characterized in that a plurality of piezoelectric elements are attached to a main plate of the impeller in a circumferentially equidistant manner, and an electric resistance is connected to the bipolar plates of the power distribution element.