JPS62283270A - Flow control valve - Google Patents

Abstract

PURPOSE:To promote the smallness of size of a valve, by mounting a throttling mechanism to a circular annular structure rotated by an ultrasonic traveling wave. CONSTITUTION:A piezo-electric circular ring 2, mounted inside the protrusive part of a pipe 1, provides divided electrodes. A metal circular ring 3 is secured to the piezo-electric circular ring 2, and its ultrasonic vibration generates a surface traveling wave. A circular annular structure 4, brought into contact with the metal circular ring 3, rotates by the ultrasonic traveling wave. A throttling mechanism 5, consisting of plural blades, is connected with the circular annular structure 4 through a pin 6. The blades are moved in accordance with the circular annular structure, if it rotates, and the throttling mechanism 5 acts changing a sectional area for fluid to pass through.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention Field of Industrial Application The present invention relates to a small flow control valve powered by an ultrasonic motor.

Prior Art FIG. 5 shows a half-sectional view of a conventional flow control valve. The fluid flows perpendicular to the plane of the paper in this figure.

24 is a block of the main body, and a space 25 is vacant inside.

26 is a pipe connected to this space.

27 is a fluid blocking valve that is moved up and down by a screw type valve 28. The area through which the fluid flows changes depending on the upper and lower positions of the fluid blocking valve 27, so that the flow rate can be controlled.

Problems to be Solved by the Invention As described above, the conventional flow control valve requires a block to be provided in a part of the pipe through which fluid flows.

The electric type was similar, requiring a large space in the lateral direction of the pipe to operate the large mechanism.

Means for Solving the Problems A cylindrical tube having a convex portion on the circumference, a piezoelectric ring having divided electrodes provided inside the convex portion of the cylindrical tube, and a piezoelectric ring provided on one side of the piezoelectric ring. A fixed metal ring, a rotatable ring that contacts the metal ring, and a crest that is attached to the ring and changes the open cross-sectional area within the cylindrical tube according to the rotational position in the circumferential direction. A flow control valve is configured with a mechanism.

In principle, the working ultrasonic motor can be made thin and has a large torque when stationary. Furthermore, due to the annular shape, a rotating shaft is not required. Therefore, if it is attached to the outer circumference of a fluid pipe, it can be attached without requiring any special space. Moreover, since it does not rotate when it is stationary, the amount of aperture does not change even if the aperture mechanism is directly driven.

Embodiment FIG. 1 shows an embodiment of the present invention. 1 is a pipe through which fluid flows, 2 is a piezoelectric ring attached to the convex part of the pipe (1111). This piezoelectric ring 2 is provided with divided electrodes. 3 is a piezoelectric ring A metal ring 2 is fixed to the metal ring 2, and is configured to generate a surface traveling wave due to ultrasonic vibration of the piezoelectric ring 2. 4 is a metal ring in contact with the metal ring 3, and the ring 4 has the above-mentioned shape in the circumferential direction. It is rotated by a traveling wave of ultrasonic waves. That is, the metal ring 3 is a stator, and the ring body 4 is a rotor, which constitute an ultrasonic motor. 5 is an aperture mechanism consisting of a plurality of blades, and a bottle 6 is attached to the rotor 4. 7 is an input terminal of the ultrasonic motor.

A more detailed structure of the annular ultrasonic motor that operates this flow restricting mechanism is shown in FIG. 21
2 is a piezoelectric body, and 22 is a metal ring which is a stator. 23 is 2
2 and corresponds to the rotor.

When an electric input is applied to the ultrasonic motor shown in FIG. 1 from the input terminal 7, the rotor 4 rotates, and accordingly the blades 5 move and the throttle mechanism moves, so that the cross-sectional area 8 through which the fluid passes can be changed.

Since the ultrasonic motor of such a flow control valve is thin, it can be installed at almost any position in the piping. Moreover, since it does not rotate when it is stationary, it has a structure that directly drives the aperture mechanism, and the number of parts is small (cost can be reduced and reliability can be improved).

FIG. 2 shows another embodiment of the present invention, in particular an enlarged view of a portion corresponding to area A in FIG. 1. Other pipe parts are the same. 9 is a pipe through which fluid flows, 10 is a piezoelectric ring, 11 is a side surface of a convex portion, and 12 is a torus that contacts 11. A blade 14 is connected to the torus 12 through a pin 13. A surface traveling wave is generated on the side surface 11 of the convex portion due to the ultrasonic vibration of the piezoelectric ring 10 . The toric body 12 in contact with the side surface 11 of the convex portion is rotated in the circumferential direction by the traveling wave of the ultrasonic wave. That is, in this embodiment, the convex side surface 11 is the stator,
The toroidal body 12 becomes an ultrasonic motor that serves as a rotor.

When an electric input is applied to the ultrasonic motor, the rotor 12 rotates, and the blades 14 move accordingly, causing the curving mechanism to operate and change the cross-sectional area through which the fluid passes. With this configuration, effects similar to those of the embodiment of FIG. 1 can be obtained.

FIG. 3 shows still another embodiment of the present invention, in particular a portion corresponding to area A in FIG. 1 is shown on an enlarged scale. Other pipe parts are the same. 15 is a pipe through which fluid flows; 16 is a piezoelectric ring; 17 is an annular convex portion provided on the pipe; and the piezoelectric ring 16 is fixed to this disk. 18 is 17
It is a torus that touches the . 20 is a blade, bottle 19
It is connected to the toric body 18 through a through hole 21 provided on the side surface of the convex portion of the pipe. Reference numeral 22 denotes O-rings for sealing provided on the inner and outer peripheries of the through hole. 17, a surface traveling wave is generated by ultrasonic vibration of the piezoelectric ring 16. The torus 18 in contact with the torus 17 is rotated in the circumferential direction by the traveling wave of the ultrasonic wave. That is, in this embodiment, the ultrasonic motor 17 serves as a stator and the toric body 18 serves as a rotor.

When electrical input is applied to the ultrasonic motor, the rotor 18 rotates, and the blades 20 move accordingly, causing the curving mechanism to operate and change the cross-sectional area through which the fluid passes. With this configuration, effects similar to those of the embodiment of FIG. 1 can be obtained.

Effects of the invention By using an ultrasonic motor as a drive source, the flow rate,
The il control valve can be downsized and can be installed at any position in the piping. Additionally, because the ultrasonic motor does not rotate when stationary, the blade can be directly driven. This reduces costs and improves reliability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a flow control valve in one embodiment of the present invention, FIGS. 2 and 3 are sectional views of other embodiments, and FIG.
The figure is a perspective view showing one example of an ultrasonic motor, and FIG. 5 is a sectional view of a conventional flow control valve. DESCRIPTION OF SYMBOLS 1... Pipe, 2... Piezoelectric ring, 3... Metal ring, 4... Toric body, 5... Blade. Name of agent: Patent attorney Toshio Nakao and one other person Figure 2 Figure 4 Figure 5

Claims (3)

[Claims] (1) A cylindrical tube having a convex portion on the circumference, a piezoelectric ring provided inside the cylindrical tube convex portion and having divided electrodes, and a metal ring fixed to one side of the piezoelectric ring. A flow rate comprising a ring, a rotatable toric body that contacts the metal ring, and a throttle mechanism that is attached to the toric body and changes the open cross-sectional area within the cylindrical pipe according to the rotational position in the circumferential direction. control valve. (2) A piezoelectric ring is provided on the annular side surface of the convex portion of the cylindrical tube, and a rotatable toric body is provided inside the convex portion of the cylindrical tube and on the back side of the toroidal side surface on which the piezoelectric material is provided. 2. The flow control valve according to claim 1, wherein the flow control valve is configured to be in contact with each other. (3) A through hole is provided on one of the annular side surfaces of the circumferential convex portion of the cylindrical tube, a piezoelectric ring is provided on the annular side surface of the cylindrical tube convex portion, and a metal ring is provided on one side of the piezoelectric ring. a rotatable toric body to which a circular ring is fixed and in contact with the metal circular ring; 2. The flow control valve according to claim 1, further comprising an O-ring disposed around the outer periphery.