JPS6143283A - Piezoelectric pump - Google Patents

Abstract

PURPOSE:To obtain a piezoelectric pump which has a simple structure and necessitates a small electric-power consumption at a low cost by utilizing piezoelectric elements as the driving source of a pump. CONSTITUTION:Ring-shaped piezoelectric elements 2 and 2 are attached onto the both surfaces of a thin circular metal plate 1. In this constitution, a parallel type bimorph element is constituted. A hole 7 as discharge port is formed at the center of the metal plate 1. The outer periphery of the metal plate 1 is supported onto a housing 3 by a supporting ring 4. A strain is provided onto the piezoelectric elements 2 and 2 by applying a voltage. Then, the metal plate 1 vibrates, and operates as piezoelectric pump, and the fluid 5 in the housing 3 is discharged from the hole 7. The fluid 5 stored in the housing 3 is gas or liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drive source for a pump, and more particularly to a piezoelectric pump that utilizes strain produced by applying a voltage to a piezoelectric element.

(Constitution of conventional example and its problems) Some conventional chimps use a motor as a drive source, but they have problems such as a complicated structure, high power consumption, and inability to finely adjust the discharge amount.

(Object of the Invention) In view of the above-mentioned drawbacks, the present invention provides a piezoelectric device that utilizes the strain produced by applying a voltage to a piezoelectric element, which has a simple and inexpensive structure, consumes little power, and allows fine adjustment of the discharge amount. It provides pumps.

(Structure of the Invention) In order to achieve this object, the piezoelectric pump of the present invention comprises a parallel type bimorph element by laminating ring-shaped piezoelectric elements on both sides of a thin circular metal plate having a hole in the center, and The metal plate of the bimorph element is supported on the outer periphery by a housing and a support ring, and a voltage is applied to the parallel bimorph element to generate flexural vibration, and the liquid or gas in the housing is transferred from the central hole of the metal plate to the housing. It can be discharged outside. Further, on the bottom of the housing, a parallel bimorph element is provided, in which ring piezoelectric elements are bonded to both sides of a thin circular metal plate without a hole in the center, and the metal plate is supported on the outer periphery, and an upper parallel bimorph element is provided. It is also possible to obtain approximately twice the ejection amount by applying the element and the voltage so that their phases are reversed. It is also possible to change the discharge state by making a plurality of holes in the center of the metal.

(Description of Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a sectional view and a plan view of a piezoelectric pump according to a first embodiment of the present invention.

In the figure, reference numeral 1 denotes a thin circular metal plate with a hole in the center, and ring-shaped piezoelectric elements 2 are pasted on both sides to form a parallel bimorph element. ing. A gas or liquid 5 to be discharged is stored in the housing 3.

The operation of the piezoelectric pump configured as described above will be described below. When a voltage is applied to the parallel type pymorph element as shown in FIG. 1, flexural vibration occurs, and the gas or liquid 5 stored in the housing 3 is discharged from the hole in the center of the metal plate 1 to the outside of the housing 3. become. The discharge amount can be adjusted by changing the applied voltage.

FIG. 3 is a sectional view of a piezoelectric pump showing a second embodiment of the present invention, and the same numbers as in FIG. 1 indicate the same parts. The difference between the one in FIG. 3 and the one in FIG. 1 is that a thin circular metal plate 1a without a hole in the center is provided on the bottom of the housing 3 and is supported on the outer periphery by a support ring 4. , piezoelectric elements 2 are pasted on both sides of this metal plate 1a,
The point is that it is a parallel bimorph.

The operation of the piezoelectric pump configured as described above will be described below. When voltages are applied to the upper parallel bimorph element and the parallel bimorph element provided on the bottom of the housing so that the voltages are in opposite phases as shown in Figure 3, deflection vibration occurs, resulting in approximately twice the discharge. You can get the amount.

FIG. 4 is a sectional view of a piezoelectric pump showing a third embodiment of the present invention. In the figure, 2 is a piezoelectric element, 3 is a housing, 4 is a support ring, and 5 is a gas or liquid, which is the same as the structure shown in FIG. 1.

The difference from the configuration shown in FIG. 1 is that a plurality of holes are provided in the center of a thin circular metal plate 1b.

The operation of the piezoelectric pump configured as described above will be explained below. When a voltage is applied to the parallel bimorph elements as shown in FIG. 4, flexural vibration is generated, and gas or liquid 5 can be discharged from the plurality of holes in the center of the metal plate 1b to the outside of the Ujifugu 3. The discharge state can be changed compared to the first embodiment.

(Effects of the Invention) As described above, in the present invention, the piezoelectric bong f is constructed of parallel bimorph elements using piezoelectric elements that produce distortion when a voltage is applied, and the structure is simple, the power consumption is small, and the discharge amount is small. Fine adjustment becomes possible, and its practical effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a piezoelectric pump according to a first embodiment of the present invention, FIG. 2 is a plan view of a piezoelectric pump according to a first embodiment of the present invention, and FIG. 3 is a cross-sectional view of a piezoelectric pump according to a first embodiment of the present invention. FIG. 4 is a sectional view of a piezoelectric pump according to a third embodiment of the present invention. 1, la, lb - metal plate, 2 - piezoelectric element, 3 - housing, 4 - support ring, 5 - liquid or gas. Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) A parallel bimorph element is constructed by laminating ring-shaped piezoelectric elements on both sides of a thin circular metal plate having a hole in the center, and the metal plate of the parallel bimorph element is supported on the outer periphery by a housing and a support ring. A piezoelectric pump, characterized in that a voltage is applied to the parallel bimorph elements to generate flexural vibrations and discharge liquid or gas within the housing out of the housing from a hole in the center of the metal plate. (2) A thin circular metal plate having no hole in the center and having ring-shaped piezoelectric elements bonded to both sides to form a parallel bimorph element is provided on the bottom surface of the housing, supporting the outer periphery; The piezoelectric pump according to claim 1, wherein the phases of voltages applied to the bimorph element and the bimorph element having a hole in the center are reversed in phase. (3) The piezoelectric pump according to claim (1), wherein the metal plate has a plurality of holes in the center.