JPS6285307A - Flow control system - Google Patents

Abstract

PURPOSE:To stop a valve and a piston at an optional position by executing an adjustment of a flow rate and a flow velocity of gas or a liquid by using an ultrasonic motor. CONSTITUTION:By driving piezoelectric vibrators 11a, 11b by an ultrasonic motor, a friction board 16 obtains a thrust, and a venturi piston 21 which has been formed as one body with a piston shaft 23 moves. By this movement, a diameter of a venturi 22 is changed, therefore, the pressure is also varied, and due to a difference of this pressure, as for a fluid of J, its quantity is adjusted and it flows into the venturi 22. The liquid of J which has flowed in is mixed with a fluid of K and fed out. In this way, by stopping the driving of the piezoelectric vibrators 11a, 11b, the piston can be stopped at its position instantaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flow control system that adjusts the flow rate and velocity of gas or liquid.

[Technical Overview of the Invention and its Problems] Conventionally, the flow rate and velocity of gas or liquid have been adjusted using valves, pistons, or the like. For example, as shown in Figure 5, by mixing the gas (A) with the gas (B),
) is used to remove the gas flow (8) from the nozzle (1) by driving the motor (2) to rotate the motor gear (3).
3) The valve (5) is moved in the (D) direction or (E) direction by the movement of the valve feed gear (4) that is engaged with the valve feed gear (4), and the above-mentioned (A) gas and (B) gas are arbitrarily mixed. It is an attempt to obtain a ratio.

However, since the motor (2) in such flow rate adjustment II 4% is composed of a coil and an iron core, there is a particular problem in that a back electromotive force is generated when the motor (2) is stopped. Therefore, when an attempt is made to stop the valve (5) at a desired position, a slight deviation occurs, which has the drawback that precise adjustment cannot be made unless the motor (2) is restarted to correct this deviation. In addition, the motor (
When using 2), it is necessary to use a motor gear (3) and a valve feeding gear (4), and there is also the problem of a lack of precision. Such a drawback is the flow of gas.

The same applies not only to flow rate adjustment but also to liquids.

[Object of the Invention] The object of the present invention is to stop a valve at an arbitrary position by adjusting the flow rate of gas or liquid using an ultrasonic motor.

[Summary of the Invention] The flow control system of the present invention is a flow control system that controls the flow, mixes, and adjusts the flow rate of gas and/or liquid. The gas i3. J: It is characterized by opening and closing a liquid passage.

[Embodiments of the Invention] Figures 1 and 2 show the principle and configuration diagram of an ultrasonic motor used in the present invention, which is attached to both ends of an elastic rail (10) made of an elastic body such as metal or plastic. For example, when the elastic rail (10) is vibrated by a piezoelectric vibrator (Ila) made of piezoelectric ceramic such as B a Ti Os or PZT, an elastic wave (12) is generated and the surface of the elastic rail (10) is It propagates above in the (F) direction. At this time, the elastic wave (12) at the mass point on the surface of the elastic rail (10) is I! When an elastic wave (12) propagates in the (F) direction while performing an elliptical motion (13) having an amplitude and a transverse amplitude, this elliptical motion wJ (13) is rotating counterclockwise. This elastic wave (12) has a peak (
14), and the elastic rail (10) has a ms body (
15), the sliding body (15) comes into contact with the elastic body 17-rule (10) only at the vertex (14), so it obtains a frictional force from the elliptical motion (9) and moves in the direction (G)1. −
Ru. Also, when the piezoelectric vibrator (iib) is driven, the rotating body (
15) moves in the direction (1()). Figure 3 shows an example in which an ultrasonic motor based on this principle is used in a control system. Figure 3 shows a venturi piston ( 21) in which the diameter of the venturi (22) is changed by the venturi piston (21).
1) is moved using a linear type ultrasonic motor, and the mixing ratio of the liquid (J) and the fluid flowing into the pen'f-, :x Lee (22) is adjusted. . In this configuration, the elastic rail (10) has a friction plate (16)
The friction plate (16) is attached to the piston shaft (23) and increases the driving efficiency of the ultrasonic motor.

The ultrasonic motor drives the piezoelectric vibrators (11a) and (11b), and the friction plate (16) generates thrust by driving the venturi piston (21) integrated with the piston shaft (23).
moves. Due to this movement, the diameter of the venturi (22) changes, so the pressure also changes, and due to this pressure (J
The liquid called l is also adjusted by venturi (22)
flows into. The inflowing liquid (J) is mixed with the fluid (J) and sent out. In this embodiment, the mixing ratio of the flowing liquid is detected, and the piezoelectric vibrators (11a) and (11b) are driven by this detection signal to perform automatic adjustment.

In this embodiment, a case has been described in which the linear ultrasonic motor is installed at one location on the side surface of the piston shaft (23), but it may be installed at several locations. Also, the piston shaft (
23) Attach the piezoelectric vibrator (+1a011b) to
An elastic rail, that is, a piston seat i171, is placed on the fixed body.
- (231 may be moved.

Next, FIG. 4 shows an embodiment of a flow control system using a valve using a linear type ultrasonic septa. The shaft (32) of the valve (31) has a valve movement screw (
33) is provided, and the Ii guide plate (34) is attached to the entire outer periphery of a part of the shaft (32). Seven piezoelectric vibrators (Ha) are attached to both ends of the elastic rail (10).
) (Nb)'? Since the valve (31) moves in a helical motion, the flow 4 can be adjusted thereby. Precise fine adjustment is possible by using a spiral screw. In the above embodiments, a case was described in which the passage was opened and closed using a piston or a valve, but the present invention is not limited to this as long as the passage is opened and closed.

[Effects of the Invention] As described above, the flow control system using the ultrasonic motor can instantly stop the valve or piston at that position by stopping the drive of the piezoelectric vibrator (11a)Nlb). Positioning accuracy is high, and there is no back electromotive force that occurs when using conventional motors. Compared to traditional Tanabata, the response speed is several hundred times faster, the power consumption is about 1/10, and there is no need for complicated mechanisms such as gears, making it simple and BH3.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the present invention; Figure 1 is a configuration diagram showing the driving principle of the ultrasonic motor; Figure 2 is a configuration diagram for explaining the structure of the ultrasonic motor; The figure is a front cross-sectional view showing a flow control system using a venturi.
FIG. 4 is a front sectional view showing a flow control system using a valve, and FIG. 5 is a front sectional view showing a conventional flow control system. (10) 4-mer L/-L, (11a) (11b)
--Piezoelectric vibrator. (12)...Elastic wave, (15)...Sliding body. (16) (34)...Friction plate, (21)...Venturi piston. (22)...Venturi, (23)...Piston shaft. (31)...Valve, (32)...Shaft. (33)...Valve moving screw Patent applicant: Marukon Electronics Co., Ltd. Song diagram Figure 3 Figure 4

Claims (1)

[Claims] (1) In a flow control system that adjusts the flow rate, mixing, and flow rate of gas and/or liquid, by driving an ultrasonic motor attached to or in contact with a shaft integrated with a piston, valve, etc. A flow control system characterized by opening and closing a liquid passage.