JPS63167098A - Supersonic wave pump - Google Patents

Abstract

PURPOSE:To make a pump highly reliable by having a monolithic structure in which a plurality of piezo-electric devices is tightened by means of a tightening means to a shaft-body having at the lower end an opening liquid-suction-hole formed axially. CONSTITUTION:When supersonic wave vibration generated by piezo-electric devices 10A, 10B is expanded at the lower portion of a shaft-body 1, and the lower end of the shaft-body 1 is made to conduct the vertical vibration of a supersonic wave, fluid convection in the sucking-up (spouting-up) direction toward a liquid-suction-hole 6 opening at the lower end of the shaft-body is caused, which is due to the expanded vertical vibration of the lower end of the shaft-body immersed in liquid, such as water or the like. Also, liquid, in comparison with air, has properties of being more apt to transmit a supersonic wave and of being more viscous, so the liquid inside the liquid-suction-hole 6 advances in the direction where supersonic vibration rises. Accordingly, even inside the liquid-suction-hole 6, force suitable for making liquid rise up is operated, which is due to the upward advance of supersonic vibration or the like, and liquid is discharged from the upper part opening of the liquid-suction-hole 6. This structure has no mechanical rotational-portion or the like, so reliability is high.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an ultrasonic pump that directly utilizes the ultrasonic vibrations of a piezoelectric element and has no mechanical rotating parts. Regarding an ultrasonic pump suitable for sucking up liquid.

(Summary of the Invention) The present invention is an ultrasonic pump that utilizes ultrasonic vibrations of a piezoelectric element. It sucks up liquid.

(Prior art) Conventionally, so-called bolted vibrators have not been found to have any pumping action to suck up liquid, and when atomizing liquid with a bolted vibrator, a separate pump or other It was necessary to supply liquid to the tip of the horn of the bolted vibrator using a liquid supply means.

Additionally, although a pump driven by an ultrasonic motor has recently been proposed, an ultrasonic pump that directly utilizes the ultrasonic vibrations of a piezoelectric element and does not have mechanical rotating parts has not yet been proposed. .

(Problems to be Solved by the Invention) By the way, all conventional pumps have mechanical rotating or moving parts, so they have problems with lifespan and reliability, and they also tend to have pulsations in the amount of liquid delivered.

(Means for Solving the Problems) In view of the above points, the present invention directly utilizes the ultrasonic vibration of a piezoelectric element to provide a highly reliable structure with a simple structure and no mechanical rotating parts. We are trying to provide an ultrasonic pump.

The present invention solves the above-mentioned conventional problems by using a structure in which a plurality of piezoelectric elements are tightened and integrated with a shaft body having a liquid suction hole opened in the lower end in the axial direction using a tightening means.

(Function) There are various possible reasons why the ultrasonic pump of the present invention sucks up liquid such as water. When the longitudinal vibration of the sound wave is applied, the vertical vibration of the lower end of the transfusion body immersed in a liquid such as water causes the liquid to be sucked (blown) up into the liquid suction hole opened at the lower end of the transfusion body. One example is that convection of liquid is caused. Second, ultrasonic waves propagate more easily in liquids than in air (because they have a higher viscosity, the liquid in the liquid suction hole travels in the direction in which the ultrasonic vibrations rise; therefore, the liquid in the liquid suction hole It is recognized that a force that raises the liquid acts inside the liquid due to the upward progression of ultrasonic vibration, etc., and the liquid is discharged from the upper opening of the liquid suction hole.

(Example) Hereinafter, an example of the ultrasonic pump according to the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the invention, in which:
A bolt-shaped shaft body 1 is formed with male screw parts 2 and 3, and a lower part of the transponder 1 is formed with an amplitude-enlarging horn part 4 narrowed to a small diameter and a disk-shaped part 5 at the lower end. Further, a liquid suction through hole 6 is formed on the central axis of the shaft body 1, and the lower opening of this liquid suction through hole 6 is connected to the lower surface of the transducer 1 (i.e., the lower end surface of the disc-shaped portion 5). It is located in the center, and the upper opening is located in the center of the upper end surface of the shaft body 1. Note that the lower opening of the liquid suction through hole 6 widens in a tapered shape.

Then, a disc-shaped 7 runno 8 and a disc-shaped electrode plate 9A.

Disc-shaped piezoelectric element 10A1, disc-shaped electrode plate 9B, disc-shaped piezoelectric element 10B, disc-shaped electrode plate 9C1, disc-shaped flat washer 12
The shaft body 1 is inserted into each through hole of the disk spring 13, and the nuts 11A and IIB are screwed into the male screw portions 2 and 3 of the shaft body 1, respectively, and tightened, thereby making the piezoelectric elements 10A and I
Each member such as the OB is tightened and integrated with the sleeve body 1. That is, the relationship between the piezoelectric cord 10A, IOB, and the transponder 1 has a structure substantially similar to that of a bolted vibrator.

An extension vibrator 7 communicating with the liquid suction through hole 6 is fixed to the upper end surface of the shaft body 1 by welding or the like.

In the configuration of the first embodiment described above, since the support of the ultrasonic pump is normally performed using seven runci 8, the liquid level P of water etc.
The position is within the range of arrow Q in FIG.

When a high frequency voltage is applied between the electrode plate 9B and the electrode plates 9A and 9G, the piezoelectric elements 10A and IOB generate ultrasonic vibrations (for example, thickness vibrations), and the vibrations are transmitted to the amplitude expansion horn at the bottom of the shaft body 1. The disk at the lower end of this transfusion body causes longitudinal vibrations (vibrations in the direction parallel to the axis as shown by arrow R in FIG. The longitudinal vibration of the shaped part 5 is caused by the liquid suction through hole 6 as shown by the arrow S.
This causes convection in the direction of sucking up (blowing) up the water, and at the same time, ultrasonic waves propagate more easily in liquids such as water than in air (
Due to the high viscosity of the liquid, the liquid in the liquid suction through hole 6 is moved in the direction of increasing ultrasonic vibration (.

On the other hand, the ultrasonic vibrations caused by the piezoelectric cords 10A and IOB propagate efficiently along the outer periphery of the shaft body 1, and both longitudinal and transverse vibrations are weak on the inner surface of the liquid suction through hole 6 located in the center of the sleeve body 1. However, as mentioned above, there is a through hole 6 for liquid suction.
Due to the fact that the ultrasonic vibrations emitted from the disc-like part 5 move upward, in addition to the capillary phenomenon, a force that moves the liquid upward acts on the liquid. Liquid is discharged from an extension pipe 7 communicating with the upper opening of the suction through hole 6.

In addition, an example of the standing wave W of ultrasonic longitudinal vibration appearing on the shaft body 1 is also shown in FIG. The vibration amplitude of the disc-shaped portion 5 is set to be the maximum, α. Further, the connection point of the extension pipe 7 is preferably located at a position where vibration occurs.

In the above FIG.
It may be directed upward or downward like T or U.

FIG. 2 shows a second embodiment of the invention, in this case the shaft 1
The lower opening of the liquid suction through hole 6A formed in the liquid suction hole 6A is widened in a tapered shape, and the liquid suction through hole 6A is
The lower part of the shaft body is defined as a large-diameter portion 15, and convection in the direction of blowing up the liquid suction through-hole 6A caused by longitudinal vibration of the disk-shaped portion (or wide portion) 5 at the lower end of the shaft body easily moves up the large-diameter portion 15 ( At the same time, the remaining upper portion of the liquid suction through hole 6A is formed into a small diameter portion 16 so that the liquid easily rises due to capillary action.

Furthermore, by making the liquid suction through hole 6A portion corresponding to the lower part of the shaft body with a large vibration amplitude larger in diameter, the cavity in the lower part of the shaft body becomes larger and lighter, resulting in a highly efficient converter. In addition,! The other components in the @2 embodiment are the same as those in the first embodiment described above.

In the ultrasonic pump shown in the first embodiment, if a large portion of the lower part of the shaft body including the amplitude expansion horn portion 4 is immersed in liquid, the vibration load due to the viscosity of the liquid increases, and the piezoelectric elements 10A, IOB The driving power to excite increases. This means that in the lower part of the shaft body including the horn part 4, if there are more parts vibrating in the atmosphere than parts vibrating in the liquid, the efficiency is better and the driving power can be lower.

FIG. 3 shows a third embodiment of the present invention that takes this point into consideration.

In FIG. 3, the 7-run 8A has a cylindrical under-liquid cover 20 integrally formed therein. 7 runci 8A, a disc-shaped electrode plate 9A, a disc-shaped piezoelectric element 10A,
The shaft body 1 is inserted into each through hole of the disc-shaped electrode plate 9B, the disc-shaped piezoelectric element 10B1, the disc-shaped electrode plate 9C, the disc-shaped part washer 12, and the disc spring 13, and the male screw part 2 of the shaft body 1 is inserted. , 3 are screwed into the nuts 11A, IIB, respectively, and tightened, thereby tightening and integrating each member such as the piezoelectric element 10A, IOB, etc. to the shaft body 1. Note that the extension pipe 7 is connected to the upper opening of the liquid suction through hole 6, and the other structure is the same as that of the first embodiment described above.

In the case of this third embodiment, the lower part of the shaft body 1 is covered with the lower liquid level cover 20 of the 7-lunge 8A, so that it does not come into direct contact with the liquid, so the liquid level is considerably higher than the lower end of the transfusion body. It has the advantage that it can be operated efficiently even when the liquid level is low, and that the practical liquid level can be set high.

FIG. 4 shows a fourth embodiment of the present invention. In this FIG. 4, a liquid suction hole 6B having a length from the lower end to the middle of the shaft body instead of a through hole is provided on the central axis of the shaft body IA. is formed. The lower opening of this liquid suction hole 6B is located at the lower end surface of the shaft body IA, and the upper opening is located at the outer circumferential surface at the middle of the shaft body.

On the other hand, an annular groove 25 is formed in the inner circumference of the lower nut 11C, and a horizontal hole 26 communicating with the annular groove 25 is formed in the lower nut 11C.
It opens on the side of C. Then, the extension pipe 7A is fixed to the nut 11C by welding or the like so as to communicate with the horizontal hole 26. Note that the structure for tightening and integrating the piezoelectric cord 10A and the IOB is the same as that of the first embodiment described above.

In this fourth embodiment, the liquid rising from the liquid suction hole 6B is transferred to the annular groove 25 of the oak) IIC, the horizontal hole 26,
and is sucked up through the path of the extension pipe 7A.

FIG. 5 shows a fifth embodiment of the present invention having both a liquid suction function and a liquid atomization function. In FIG. 5, the shaft body IB has an amplitude enlarging horn part 4 and a disc-shaped part 5 for the pump function at the lower part, and an amplitude enlarging horn part 30 and the disc-shaped part for the atomizing function at the upper part. It is equipped with 31. The structure for tightening and integrating the piezoelectric element 10A and IOB is the same as in the first embodiment described above.

In this fifth embodiment, the liquid that has risen through the liquid suction through hole 6 is atomized by the ultrasonic vibration of the upper end surface of the disc-shaped part 31 where the upper opening is located. and disperse into the atmosphere as fine particles. The structure shown in Fig. fpJ5 can be used, for example, to atomize and evaporate drain water from an air conditioner.

Note that by combining a plurality of ultrasonic pumps of the present invention, the height at which liquid can be pumped can be increased.

(Effects of the Invention) As explained above, according to the present invention, a structure is provided in which a plurality of piezoelectric elements are tightened and integrated by a tightening means to a shaft body in which a liquid suction hole opening at the lower end is formed in the axial direction. Therefore, it is possible to realize a highly reliable ultrasonic pump with a simple structure without mechanical rotating parts. Further, since the ultrasonic pump of the present invention continues the liquid pumping operation steadily, there is an advantage that the amount of liquid supplied is stable without pulsation.

[Brief explanation of the drawing]

FIG. 1 is a front cross-sectional view showing a $1 embodiment of an ultrasonic pump according to the present invention, FIG. 2 is a partial front cross-sectional view of a second embodiment of the present invention, and FIG. 3 is a third embodiment of the present invention. FIG. 4 is a front sectional view of the J@4 embodiment of the present invention, and FIG. PIIJ5 is a front sectional view of the @5 embodiment of the present invention. 1, IA, IB... shaft body, 2, 3... male screw part, 4
... Amplitude expansion horn part, 5... Disc-shaped part, 6.6A
...through hole for liquid suction, 6B...hole for liquid suction, 7.7A...extension pipe, 8,8A...7 runno, 10A, IOB...piezoelectric element, 11A, 11B
, 11C...Natsuto.

Claims (4)

[Claims] (1) An ultrasonic pump characterized in that a plurality of piezoelectric elements are tightened and integrated with a shaft body having a liquid suction hole opened in the lower end in the axial direction using a tightening means. (2) The ultrasonic pump according to claim 1, wherein the shaft body has a disk-shaped portion at the lower end of the horn portion for amplitude expansion. (3) The ultrasonic pump according to claim 1, wherein the lower opening of the liquid suction hole widens in a tapered shape. (4) The ultrasonic pump according to claim 1, wherein the lower part of the liquid suction hole has a larger diameter than the upper part.