JP2594070B2 - Automatic opening and closing control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is used in a fluid handling pipeline or the like, and relates to an improvement of an electric control valve.

(Prior Art) A conventional electric control valve is configured to open and close a valve by moving a valve body up and down by a solenoid, a motor, or the like. Usually, the valve is remotely and automatically controlled using an electric signal. I have.

However, solenoids and motors have disadvantages in that the drive unit is increased in size, and a booster mechanism is required to reduce the size of the drive unit, which complicates the valve structure.

In addition, since the solenoid and the motor slide or rotate, fluctuations in the valve driving torque due to mechanical friction of a plunger or the like are unavoidable, resulting in poor operation stability and troublesome maintenance. There is.

Further, there is a problem that the driving power becomes considerably large, and when an electric signal is used as a signal for remote control, noise resistance and explosion resistance are poor.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problem in the conventional electric control valve of this type, that is, if the drive unit is increased in size and the drive unit is reduced in size, It is a solution to problems such as the need for a mechanism, lack of operation stability and troublesome maintenance and maintenance, and lack of explosion resistance and noise resistance. It is an object of the present invention to provide an automatic control valve that can further reduce its size and improve explosion resistance by using a piezoelectric element that can obtain an output in a drive unit, and further enhances operation stability.

(Means for Solving the Problems) The present invention communicates between the inlet 12 and the outlet 13 and
A valve case 1 provided with a valve body insertion hole 16 communicating with the fluid passage 14; A biased valve element 5; and a diaphragm 3 disposed above the valve box 1
With one end fixed to the diaphragm 3 and a valve element insertion hole 16;
It is airtightly and slidably inserted into the inside, and a central portion is provided with a passage communicating between the space below the diaphragm 3 and the valve element insertion hole 16, and the lower end thereof is airtight to the upper part of the valve element 5. And a lid 2 fixed to the valve box 1 with the peripheral edge of the diaphragm 3 airtightly clamped.
A pressurizing passage 20 communicating the inlet 12 side of the valve box 1 with the upper space of the diaphragm 3; an exhaust hole 18 communicating the lower space of the diaphragm 3 of the valve box 1 with the outside air; Exhaust nozzle 7 that communicates the space above and the outside air
A piezoelectric element 8 that opens and closes the exhaust nozzle 7 by application of an electric signal. When the fluid passage 14 with the exhaust nozzle 7 opened is closed, the fluid on the outlet 13 side is closed and the exhaust hole is provided. The discharge to the outside of the system through 18 is the basic configuration of the invention.

(Operation) When the input signal to the piezoelectric element 8 is equal to or more than a specified value, the tip of the flapper is lowered by the mechanical output generated in the piezoelectric element 8, and the nozzle 7 is closed.

The fluid pressure on the inlet side 2 is introduced into the upper diaphragm chamber 19 through the pressurizing passage 20, and the diaphragm 3 is pressed downward, whereby the valve body 5 descends and opens. The head of the valve body 2 and the presser fitting 4 are in airtight contact with each other, so that the fluid does not leak to the outside through the exhaust hole 18.

When the input to the piezoelectric element 8 becomes zero or less than a specified value, the mechanical output of the piezoelectric element is lost, the tip of the flapper moves upward, the nozzle 7 is opened, and the pressure in the upper diaphragm chamber 19 drops. . As a result, the valve element 5 abuts on the valve seat 15 due to the elasticity of the spring 6, closes the valve, and the fluid pressure on the outlet 13 side is discharged from the exhaust hole 18 through the valve element insertion hole 16 to the outside of the system.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view of an automatic control valve according to the present invention, and FIG. 2 is a longitudinal sectional view thereof.

In the figure, 1 is a valve box, 2 is a lid, 3 is a diaphragm,
4 is a holding bracket, 5 is a valve body, 6 is a spring, 7 is an exhaust nozzle, 8 is a piezoelectric element, 8a is a support base, 9 is an input terminal block, 10
Is a pressure sensor. Note that a flat-plate-shaped piezoelectric ceramic is used for the piezoelectric element 8, and is formed in a so-called flapper shape.

The valve box 1 is formed by packing an upper body 1a and a lower body 1b.
It is integrally formed in an airtight manner through 11
2, outlet 13, fluid passage 14 communicating between the entrance and exit, valve seat 15,
A valve body insertion hole 16 communicating with the fluid passage 14, a lower diaphragm chamber 17, and an exhaust hole 18 communicating with the valve body insertion hole 16 are formed respectively.

In the upper body 1a, a pressurizing passage 20 communicating between the fluid inlet side 2 and an upper diaphragm chamber 19 described later, and a pressure measuring passage 21 connecting the fluid outlet side 3 and the pressure sensor 10 are formed, respectively. ing.

The lid 2 has a concave portion forming an upper diaphragm chamber 19 on a lower surface side, and a pressure sensor on an upper surface side.
Ten accommodation holes 22 are formed.

Further, the lid 2 is provided with a nozzle insertion hole 23 for communicating the upper diaphragm chamber 19 with the outside air, and the discharge nozzle 7 is screwed into the nozzle insertion hole 23.

The valve box 1 and the lid 2 are provided with two diaphragms 3a and 3b.
Are assembled in a state where the peripheral edge portions are sandwiched, and are airtightly integrated by bolts 24.

Stoppers 25 and stop nuts 26 are attached to the diaphragms 3a and 3b.
And the presser fitting 4 is fixed. When the diaphragm 3 descends, the lower end of the holding member 4 and the head of the valve element 5 inserted into the valve element insertion hole 16 are airtightly contacted, and the valve element 5 is pressed downward.

The valve element 5 is pressed toward the valve seat 15 by the elastic force of the spring 6, and is opened when the diaphragm 3 descends.

Above the lid 2, a support 8a is fixedly mounted, and the support 8a supports a piezoelectric element 8 for opening and closing the nozzle 7. That is, the piezoelectric element 8 is formed in a flapper shape by the piezoelectric ceramic as described above, the base end is fixed to the support base 8a, and the front end is in contact with the opening of the exhaust nozzle 7. .

The piezoelectric element 8 is electrically connected to an input terminal 9, and when a signal voltage (10 to 30 V) is applied, distortion occurs due to a so-called piezo effect, and the tip of the flapper moves downward to exhaust air. The nozzle 7 is closed.

The pressure sensor 10 measures the fluid pressure on the fluid outlet side 13. When the fluid pressure is applied to the sensor 10 through the pressure measurement passage 21, a voltage signal proportional to the fluid pressure is output.

 Next, the operation of the automatic control valve will be described.

When the input signal to the terminal 9 is equal to or more than the specified value, the exhaust nozzle 7 is closed by the nozzle flapper.

The fluid pressure on the inlet side 2 is introduced into the upper diaphragm chamber 19 through the pressurizing passage 20, and when the diaphragm 3 is pressed downward, the valve body 5 descends and opens.

At this time, the head of the valve body 2 and the presser fitting 4 are in airtight contact with each other, and the fluid does not leak outside through the exhaust hole 18.

Next, when the input signal to the terminal 9 becomes zero or less than a specified value, the tip of the flapper moves upward due to the elimination of the distortion force generated by the piezoelectric element 8, the nozzle 7 is opened, and the upper diaphragm chamber 19 is opened. Pressure drops. As a result, the valve element 5 abuts against the valve seat 15 due to the elasticity of the spring 6 and is closed, and the fluid pressure on the outlet 13 side is discharged from the exhaust hole 18 through the valve element insertion hole 16 to the outside of the system.

In the present embodiment, the valve is opened by lowering the diaphragm 3, but the valve may be closed by lowering the diaphragm 3 by changing the relative positions of the valve element 5 and the spring 6. Of course.

FIG. 3 shows an example of an application example of the automatic control valve of the present invention, and is a system diagram for opening and closing the main valve 27 by remote control.

From the orifice 29 interposed in the main conduit 28 to the controller 30
The fluid pressure adjusted to 0.2 to 1.0 kg / cm ² is supplied to the automatic control valve A of the present invention.

When the input of the electric signal 31 is zero or less than the specified value, the automatic brake valve A is closed, the fluid pressure in the diaphragm chamber of the main valve 27 is discharged, and the main valve 27 is closed. .

When an optical signal 33 is input to the photoelectric conversion device 34 through the optical fiber 32 by remote control, the optical signal 33 is converted into an electric signal 31 and input to the piezoelectric element 8 of the automatic control valve A. As a result, the exhaust nozzle is closed and the automatic control valve A is opened, and the reduced fluid pressure is directly applied to the diaphragm chamber of the main valve 27, and the valve chamber is opened.

FIG. 3 shows the case where the present automatic control valve A is used as a pilot valve, but the present automatic control valve A can also be used as a so-called automatic valve positioner.

(Effect of the Invention) In the present invention, the exhaust nozzle is opened and closed by using the distortion force of the piezoelectric element, and the valve is opened and closed by this, so that the conventional solenoid or motor is connected to the drive unit. The size of the drive unit can be significantly reduced as compared with the automatic control valve, and the valve can be reliably opened and closed without using a booster mechanism.

Further, since the piezoelectric element generates a relatively large and always stable constant mechanical output (distortion force and distortion amount) even with a small electric input amount, the operation of the automatic control valve is performed by a conventional solenoid type or motor type. It becomes more stable as compared with the control valve.

Further, since the electric contact mechanism in the drive unit can be completely eliminated, and the input electric energy is directly converted to the mechanical output, it is possible to significantly improve explosion resistance and reduce energy consumption. .

The present invention has excellent practical utility as described above.

[Brief description of the drawings]

FIG. 1 is a plan view of the present automatic control valve, and FIG. 2 is a longitudinal sectional view thereof. FIG. 3 shows one application example of the present automatic control valve. A ... automatic control valve, 9 ... input terminal 1 ... valve box, 10 ... pressure sensor 2 ... lid, 12 ... fluid inlet 3 ... diaphragm, 13 ... fluid outlet 4 ... presser fitting, 14 fluid passage 5 valve body 15 valve seat 6 spring 16 valve body insertion hole 7 exhaust nozzle 18 exhaust hole 8 piezoelectric element 20 pressurized Passage 8a ... Flapper support

Claims (1)

(57) [Claims] 1. A fluid passage (14) communicating between an inlet (12) and an outlet (13) and having a valve seat (15) in the middle; a valve body insertion hole (14) communicating with the fluid passage (14). A valve body (1) provided with a valve body (16); and a valve body (5) urged toward and away from the valve seat (15) by a spring (6) and provided so as to be able to freely contact and separate from the valve seat (15); A diaphragm (3) disposed above the valve box (1); one end of which is fixed to the diaphragm (3) and hermetically and slidably inserted into the valve body insertion hole (16); A valve body provided with a passage communicating between a space below the diaphragm (3) and the valve body insertion hole (16), and a lower end thereof being airtightly contactable with an upper part of the valve body (5). A holding member (4); a lid (2) fixed to the valve box (1) by hermetically holding the periphery of the diaphragm (3); and an inlet (12) side of the valve box (1) and the diaphragm. A pressure passage (20) communicating with a space above the ram (3); an exhaust hole (18) communicating the space below the diaphragm (3) of the valve box (1) with the outside air; 3) an exhaust nozzle (7) that communicates the upper space with the outside air; and a piezoelectric element (8) that opens and closes the exhaust nozzle (7) by applying an electric signal, and opens the exhaust nozzle (7). Fluid passage (1
An automatic opening / closing control device characterized in that when the valve is closed in (4), the fluid on the outlet (13) side is discharged out of the system through the passage of the presser fitting (4) and the exhaust hole (18).