JPS61265398A - Fluid driving apparatus - Google Patents

Abstract

PURPOSE:To obtain the fluid stream having a certain flow rate and the superior controllability by installing a driving power source which possesses the adjusting function for allowing the driving frequency of a vibrating plate installed onto the bottom surface of a wall body to accord with the resonance frequency determined according to the dimension condition of a driving tube. CONSTITUTION:A vibrating plate 13 is installed in parallel to the bottom surface of a circular truncated cone shaped wall body 18 at the wall surface part of the space 11 in front of a coil 15, and a driving tube 12 is connected vertically to the surface of the top part. When electric power is supplied into the coil 15 by the sine-wave voltage having a frequency of f0 determined by a specific equation by an electric power source apparatus (not shown in the figure), a vibrating plate 14 and a coil 13 supported by a spring 14 are vibrated right and left by the mutual action between a permanent magnet 16. Since the space 11 and the driving tube 12 satisfy the equal frequency condition of f0, the column-shaped fluid 23 in the driving tube 12 vibrates as if the fluid is formed in integral form. When the column-shaped fluid 23 moves rightward, the fluid in the vicinity of the inlet of the driving tube 12 is driven rightward, and when the fluid moves leftward, the fluid on the periphery is inhaled, and the fluid stream having the superior controllability can be obtained with several cycles after the start of operation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a fluid drive device for transporting fluids such as gases and liquids.

Conventional Technology In a conventional fluid drive device that conveys gas or liquid using a drive source that makes reciprocating motion, as shown in FIG.
．． Since the discharge valve 3 is required, the structure is complicated and it is difficult to provide an inexpensive one. In addition, since it uses a reciprocating drive source, the flow rate fluctuates through the suction and discharge processes, so in order to keep the flow constant, a smoothing device 6 such as a storage tank with a large capacity is required, and the flow rate Control becomes difficult.

Further, in a conventional device as shown in FIG. 7 which uses a rotating body such as an impeller as a driving source, it is easy to obtain a constant flow rate, but it is expensive because it uses an electric motor 8 and an impeller 7. Further, since the rotor of the electric motor 8 and the impeller T have rotational inertia, this type of fluid drive device also has poor responsiveness when changing the flow rate, making it difficult to control the flow rate.

In addition, with the advancement of electronic technology, highly accurate control is possible using advanced control devices and special electric motors, but they are also more expensive, and conventional pumps and blowers have fixed structures. It is difficult to integrate into mechanical equipment.

Problems to be Solved by the Invention As mentioned above, the conventional technology has problems such as complicated and expensive structure, large flow rate fluctuations, poor controllability, and fixed shape that makes installation difficult. There's a problem.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide, at low cost, a fluid drive device that has a simple configuration that uses a diaphragm as a drive source, has a stable flow rate, and has good controllability.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention connects a drive tube to a part of the housing by communicating with the outside, and provides a diaphragm inside the housing, and a drive tube for the diaphragm. The driving power source is equipped with a drive power source having an adjustment function to match the vibration frequency with a resonance frequency determined by the dimensional conditions of the housing and the drive tube.

Function: Due to the above-described structure, the present invention is capable of producing a fluid flow from the tip of the drive tube at a constant flow rate and with good controllability, without requiring suction or discharge valves, even though the reciprocating diaphragm is used as the drive source. can be obtained.

Embodiment FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
A drive pipe 12 is connected to the drive pipe 12 to communicate with the outside.

Inside the housing 10, a diaphragm 13 is attached to the housing 1o via a spring 14.
A large space 11 is formed on the front side of the diaphragm, which is divided into two chambers by a spring 14 and a spring 14. Drive tube 12 is space 1
1 forms a Helmholtz resonator. A coil 15 is fixed to the diaphragm 13 and faces the permanent magnet 16 concentrically. A power supply device 17 has a frequency adjustment function and supplies power to the coil 16 with a voltage at a predetermined frequency.

As mentioned above, the drive tube 13 (cross-sectional area: m, length: L) forms a Helmholtz resonator with the space 11 (volume: v), and the frequency f is expressed by the following equation. Resonates at Hz.

Here, C is the sound velocity of the fluid, π is pi, and α is the correction coefficient. Next, the operation of this device will be explained.

When the power supply device 17 supplies power to the coil 15 with a sinusoidal voltage having a frequency fo determined by equation (1), the diaphragm 14 supported by the spring 14 and the coil 13 due to the interaction with the permanent magnet 16 move as shown in FIG. It vibrates in the left and right directions. As mentioned above, since the space 11 and the drive tube 12 have the same fo resonance condition, the columnar fluid 23 inside the drive tube 12 vibrates violently as if they were one body, as shown by the dotted line in the figure. . When the columnar fluid 23 moves to the right, the fluid near the inlet of the drive pipe 12 is driven to the right. When the columnar fluid 23 moves to the left, the stationary fluid around it is sucked into the pipe as shown in the curved line shown in the figure. Next, when the columnar fluid 23 moves to the right again, it drives this sucked fluid to the right. As a result, a flow as shown by the arrow in the figure is formed several cycles after the start of operation. Drive tube 1
The flow is turbulent near the inlet 2, but a little downstream a flow with a nearly constant flow velocity is formed as shown by the straight line in the figure. Therefore, although a reciprocating diaphragm is used as a driving source, a smoothing device for absorbing flow pulsations is not required. Moreover, changing and controlling the flow rate and flow rate can be easily achieved by changing and controlling the voltage applied to the coil 16.

Next, other embodiments of the present invention will be described. In FIG. 2, the wall portion of the space 11 in front of the coil 15 is made into a truncated conical wall 18, and the diaphragm 13 is parallel to the bottom surface of the wall 18.
A drive tube 12 is connected perpendicularly to the top surface. Other configurations and operations are the same as the embodiment shown in FIG. However, by forming the wall 18 into a truncated cone shape, the effect of improving work efficiency can be obtained.

FIG. 3 shows the spring 14° diaphragm 13 of the embodiment shown in FIG. Coil 15. Since the drive source is made up of a permanent magnet 16 and a piezoelectric element 22 is bonded to a diaphragm 21, the structure can be made simpler. Other functions and effects are the same as those of the embodiment shown in FIG.

Further, the vibration system spring 14 of the drive source shown in the embodiments of FIGS. 1 and 3. Vibration plate 13. The resonant frequency f of the Helmholtz resonator, which is composed of the space 11 and the drive tube 12, is the natural diaphragm of the vibration system composed of the combination of the coil 16, the piezoelectric element 22, and the diaphragm 21. By making it equal to Hz, a fluid drive device with a large capacity can be provided.

Fig. 4a shows an embodiment in which a taper 19 is provided at the end of the drive tube 12, and Fig. 4 shows an embodiment in which a rounded part 2o is provided. However, Figure 4a
, b can improve work efficiency. FIG. 6 is a diagram showing an embodiment in which a drive tube 23 having a rectangular cross-sectional shape is installed, and a fluid flow having a rectangular cross-section can be obtained. Other configuration 2 functions and effects are the same as those of the embodiment shown in FIG.
It is possible to provide a fluid drive device that generates a flow at a stable flow rate and flow velocity with few pulsating components without the need for a discharge valve and without using a flow smoothing device.

Moreover, according to the present invention, the flow rate and flow velocity can be changed and controlled by simply changing and controlling the voltage, and the responsiveness is also good.

Also, as you can see from the above explanation, the device basically consists of a hollow container, a branch pipe that communicates with it, and a vibrator, so it can be made into any shape according to the purpose of use, so it can be used in a similar way to a conventional blower. It is possible to provide a fluid drive device that is easier to use than a pump, has a simple structure, and is inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a fluid drive device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a fluid drive device according to a second embodiment, and FIG. 3 is a cross-sectional view of a fluid drive device according to a third embodiment. Figures 4a and 4b are detailed cross-sectional views showing the ends of the drive tube of the same device, Figure 5 is a front view showing an embodiment in which the cross-sectional shape of the drive tube is rectangular, and Figure 6 is a cross-sectional view of the device. The figure is a cross-sectional view showing a conventional example using reciprocating motion as a driving source, and FIG. 7 is a cross-sectional view showing a conventional example using rotary motion as a driving source. 10... Housing, 11... Space, 12.
... Drive tube, 13 ... Vibration plate, 14 Mountain... Spring, 15 ... Coil, 16 ...
...Permanent magnet, 17... Power supply device, 21...
- Vibration plate, 22...Piezoelectric element. Name of agent: Patent attorney Toshio Nakao Haga 1 person No. 4
Unzuq---Taba 20-90 East

Claims (6)

[Claims] (1) A drive tube is connected to a part of the casing by communicating with the outside, a diaphragm is provided inside the casing, and the driving frequency of the diaphragm is determined by the dimensional conditions of the casing and the drive tube. A fluid drive device having a drive power source with frequency matching adjustment capability. (2) The fluid drive device according to claim 1, wherein the natural frequency of the diaphragm is made to match the resonance frequency determined by the dimensional conditions of the housing and the drive tube. (3) A part of the wall surface of the housing is made into a hollow truncated cone shape, and the drive tube is connected to the top of the truncated cone shape of the housing, and vibrates in parallel to the bottom of the truncated cone shape of the housing. A fluid drive device according to claim 1, which comprises a plate. (4) The fluid drive device according to claim 1, wherein the external opening end of the drive tube is tapered or bell-mouthed. (5) The fluid drive device according to claim 1, wherein the drive tube has a rectangular cross-sectional shape. (6) The fluid drive device according to claim 1, wherein the diaphragm is a diaphragm driven by a piezoelectric element.