JPH0128312Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a piezoelectric vibrator for pumps, and more specifically, it vibrates when a voltage is applied to the piezoelectric element, and the vibrations can be used, for example, to suck or pump fluid. The present invention relates to a piezo vibrator suitable for use in a type of pump that performs operation.

(B) Prior art A pump using a piezo element vibrates a piezo oscillator, that is, a piezoelectric oscillator, by applying an alternating current voltage to the piezo element, thereby increasing the volume of the pump chamber limited by the piezo oscillator. It is designed to change the flow rate, thereby discharging the fluid.

Conventional pumps of this type include the Japanese Patent Application Publication No.
Some of these are disclosed in Publication No. 59-41684 or Japanese Utility Model Application Publication No. 59-68192. Piezo vibrators used in conventional piezo pumps, including the pumps described in these publications, include a disk-shaped piezo element b on one side of a disk-shaped vibrator a, as shown in FIG.
There are two types of piezo elements, one that is just a combination of two piezo elements, and another that has a cylindrical piezo element c as shown in Figure 7. In both cases, the peripheral part of the vibrator is fixed with a holder installed inside the pump body. Since it has to be held, it is not possible to vibrate with sufficient amplitude, and there is a problem that a sufficient discharge amount of the pump cannot be obtained.

(c) Problems to be solved by the invention The problem to be solved by the invention is that by improving the structure of the piezoelectric vibrator, it is possible to vibrate with a large amplitude, and it can be easily assembled as a pump. It is to do so.

(d) Means for solving the problem The piezo vibrator of the present invention to solve the above problem has a plurality of piezo elements arranged circumferentially in a planar manner, and each piezo element is electrically connected. connection,
The piezo element is integrally molded with a non-conductive flexible material, and the mold is provided with a through hole in the center and a check valve that allows fluid to flow in only one direction through the through hole. .

(E) Effect When a voltage is applied to the pair of connecting terminals of the piezo vibrator having the above configuration while supporting the peripheral portion, the center portion vibrates by repeating a state in which it protrudes to one side and a state in which it protrudes to the other side. . A through hole and a check valve are connected from one side of the piezo vibrator to the other side.

(f) Example This example will be described below with reference to the drawings.

A piezo vibrator 1 of a first embodiment is shown in FIGS. 1 and 2. FIG. A piezo vibrator (hereinafter simply referred to as a vibrator) 1 consists of fan-shaped piezo elements 2, which are made by dividing a disk into four equal parts, arranged circumferentially apart on one plane as shown in FIG. Conductor rings 3 and 3' that electrically communicate with the piezo element are provided around the upper and lower surfaces of the piezo element 2, and the piezo element and the conductor rings 3 and 3' are made of a material that is elastic and non-stretchable, such as rubber. It is made by integrally molding a conductive flexible material 5.

Each conductor ring 3 and 3' is integrally formed with a connecting terminal 4 and 4' extending radially outward;
These connecting terminals 4, 4' project outward from the molded part of the flexible material.

A hollow cone 7 that defines a through hole 6 is integrally formed in the center of the mold part 5, and a plurality of hollow cones (4 in this embodiment) are formed at the tip of the hollow cone 7.
slits 8 are formed spaced apart in the circumferential direction. This hollow cone 7 acts as a check valve, opening at the slit 8 to allow the flow of fluid in the direction of the arrow, and closing the slit to allow the fluid to flow in the opposite direction. prevent. Annular protrusions 9 and 9' are formed on both sides of the periphery of the mold part 5.

In the vibrator having the above configuration, the annular protrusions 9, 9'
When an alternating current voltage is applied between both connection terminals 4 and 4' while pressing the portion , the vibrator 1 vibrates alternately between a state in which the center portion protrudes upward and a state in which the center portion protrudes downward.

Note that the shape or number of piezo elements 2 can be arbitrarily determined, not limited to the case shown in the drawings, and can be of any shape other than the circular shape of the piezo vibrator.

In FIGS. 3 and 4, a vibrator 1a of another embodiment is shown. In this vibrator 1a, a plurality of through holes 6a are formed in the center of a molded part 5a, spaced apart in the circumferential direction on a desired circle, and an umbrella-shaped valve body 7a is fitted and fixed in the center of the circle. There is. This umbrella-shaped valve body 7a acts as a check valve that covers the through hole. The configuration of other parts is the same as that of the first embodiment.

In this embodiment, the peripheral part 8a of the valve body 7a separates from the upper surface of the molded part 5a to allow the fluid to flow in the direction of the arrow, but the peripheral part 8a contacts the upper surface in the opposite direction. to prevent fluid flow.

In FIG. 5, a piezo pump 10 using the vibrator 1 shown in FIGS. 1 and 2 is shown. This piezo pump 10 has a plurality of (four in this embodiment) vibrators 1 sandwiched between a pair of covers 11 and 12 and stacked on top of each other, and these are connected by bolts and nuts (none of which are shown). It is fixed by a pair of presser rings 16 and 17. Cover 11 has an inlet port 13 and cover 12 has an outlet port 14 formed therein.

When the terminals 4 and 4' of each diaphragm 1 are connected as shown in Fig. 5 and an AC voltage is applied, the center portions of the first and third vibrators from the bottom protrude downward. The second and fourth vibrators are alternately deformed so that their centers protrude upward, and then the opposite condition occurs. Then, first, fluid is introduced into the pump chamber 21 limited between the first and second vibrators from the bottom through the inlet port 13, and the third and fourth vibrators from the bottom are introduced. The fluid in the pump chamber 22, which is limited between the second and third vibrators, flows into the pump chamber 23, which is limited between the second and third vibrators.
One fluid flows into the pump chamber 22 and the fluid in the pump chamber 23 is discharged through the outlet port 14. Thereafter, due to the above-described continuous vibration of the vibrator 1, fluid is sucked from the inlet port 13 and discharged from the outlet port 14.

Note that, instead of forming the annular protrusion integrally, a ring-shaped separator may be inserted between the piezo vibrators during use. Furthermore, although the piezo elements are electrically connected via the conductor ring, the conductor ring is not necessarily necessary and lead wires may be drawn out from each piezo element.

(g) Effects The piezoelectric vibrator according to the present invention can have the following effects.

The amplitude can be larger than that of a conventional vibrator of the same size (diameter).

Therefore, when used in a pump, the discharge amount can be increased compared to a conventional pump of the same size.

Can electrically insulate piezo elements.

Since the check valve is integrally formed and an annular projection is formed around the periphery, assembly as a pump is easy.

The discharge pressure of the pump can be increased by using a desired number of them in combination as needed.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of the piezoelectric vibrator according to the present invention, FIG. 2 is a diagram showing the arrangement of piezo elements of the piezoelectric vibrator of FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the embodiment of FIG. 3, and FIG.
This figure is a cross-sectional view of a piezo pump made using the piezo vibrator shown in FIG. 1, and FIGS. 6 and 7 are views showing conventional vibrators. 1, 1a: piezo vibrator, 2, 2a: piezo element, 3, 3', 3a, 3'a: conductor ring, 4,
4', 4a, 4'a: connection terminal, 5, 5a: mold part, 6, 6a: through hole.

Claims (1)

[Scope of utility model registration request] A plurality of piezo elements are arranged circumferentially in a planar manner, the individual piezo elements are electrically connected, the piezo elements are integrally molded with a non-conductive flexible material, and the molded part is 1. A piezo vibrator for a pump, characterized in that a through hole and a check valve that allows fluid to flow in only one direction through the through hole are provided in the center of the piezo vibrator.