JPS6320603A - Automatic set reduction valve - Google Patents

Abstract

PURPOSE:To provide a quick responsiveness by preliminarily storing relations between the absolute position of a detector and a set pressure target value and operating an extent of operation displacement for an optional set pressure and operating a reduction valve to momently approach the target value. CONSTITUTION:Relations between the absolute position in the axial direction of a control screw 17 which controls the elastic force of a pressure set spring 16, namely, the displacement in the axial direction of a disk 24 and the set pressure target value are stored in the computer in a controller. When a desired set pressure target value is inputted through the regulator 32, a set signal as the position signal of the control spring is operated and is sent to a comparison controller 31. The signal from a position detecting sensor 26 is compared with said signal by the comparison controller; and if the deviation detection value is larger than a deviation reference value, such signal is sent to a driver 30 that an actuator is operated to make the deviation detection value of about zero. Thereafter, a motor 29 is operated to displace the control screw 17 at a time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a valve for controlling the pressure of a fluid, and more particularly to a pressure reducing valve that reduces the pressure of a fluid on the primary side so as to maintain a constant pressure on the secondary side.

What is generally referred to as a pressure reducing valve has a structure in which a main valve, such as a piston valve, is operated directly by displacing a diaphragm, or indirectly by operating a pilot valve.

The fluid pressure on the secondary side is applied to one side of the diaphragm, and the elastic force of a pressure setting spring is applied to the other side. If the blades are unbalanced, the diaphragm is displaced and the valve body is operated to adjust the passage of fluid, maintaining the pressure on the secondary side at a value corresponding to the elastic force of the pressure setting spring.

To set the fluid pressure on the downstream side to a desired value, while checking the pressure on the downstream side with a pressure gauge, manually operate the adjusting screw screwed into the valve casing to adjust the elastic force of the pressure setting spring. Adjust so the pressure gauge points to the desired pressure value. Therefore, it is extremely inconvenient when changing the set pressure frequently. Additionally, remote control and automatic control are not possible.

In the prior art, an automatic Ll control valve is used in such cases. Self 81. II ill-bento (Yo, R1tan)
Target (1) Production of 'bll ll amount, comparison with eye level difference, publication that exposes the width difference [Book 1] Electric motor and flow that process commands etc. as signals to operate the valve body (this actuator only) This is to improve the operation part of the machine 111 times.

When used as a pressure reducing valve, a pressure sensor measures the pressure on the secondary side, compares it with a drift value input through a setting mechanism, processes it as a signal, and operates an actuator such as an electric motor to perform proportional operation. , or a differential/integral operation, so-called PID operation. Therefore, it is easy to change the target value, and remote control or automatic control is possible.

Problems to be Solved by the Invention However, automatic control valves are expensive. This is because the valve body must be operated directly and rapidly in small increments using an actuator such as an electric motor, which requires a human-powered actuator and a controller that performs complex signal processing.

Furthermore, since the PID constant settings differ depending on the control pair, it takes some knowledge and experience to set them properly.

In addition, since the opening and degree of the valve to be used as a vote is unknown, the response time of the instruction IEt is very slow because the opening and degree of the valve must be adjusted individually. Become.

The technical problem of the present invention is that the set pressure can be easily changed, remote control or automatic control is possible, and difficult operations are not required.
A pressure reducing valve with quick response can be created using a small output actuator.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems is to provide a pressure reducing valve with a diaphragm structure with an actuator that operates a means for adjusting the force of a pressure setting spring. (Installation, fixed spring bullet with pressure δ) 1. Provide a detection gap that converts the axial displacement of the above means for adjusting the force into an electrical signal, and store the relationship between the absolute position of the above means and the set pressure target value in a computer. Then, for any set pressure, the operation displacement amount is extracted from the above relationship, and the above technique is operated so as to instantaneously approach the target value.

action The operation of the above technical means is as follows.

The computer in the controller stores the relationship between the pressure setting spring's elastic force, the absolute position of the adjusting screw in the axial direction, and the set pressure target value, and the desired set pressure is set through the controller. When the target value is input, a δΩ constant signal as a position signal of the adjusting screw is calculated and sent to the comparator and adjuster. The comparison controller compares the signal from the position detection sensor with the above signal, and if the detected deviation value is larger than the standard difference value, a signal is sent to the driver to operate the actuator so that the detected deviation value becomes almost zero. It will be done.

The actuator is operated by a screwdriver, and the adjustment screw rotates to the right or left at once, adjusting the elastic force of the pressure setting spring.As a result, the diaphragm is displaced and the valve body is operated, and the fluid pressure on the secondary side becomes constant.

In this way, the actuator operates the adjustment screw all at once toward the target value, making it possible to set the pressure much faster than with conventional PID control. fifJ et al. improves responsiveness.

The diaphragm structure pressure reducing valve is made in the same way as before11')J
do. That is, if the pressure on the secondary side is within the range of the deviation t[\ value, the actuator does not operate, and the pressure is reduced by mechanical operation by the diaphragm.

Therefore, the set pressure can be easily changed each time the set pressure target value is entered, and it goes without saying that remote control is possible.

Further, since the actuator operates the elastic force adjusting means and is not in a severe condition such as directly operating the valve body quickly, a small output may be sufficient. Moreover, the valve body is mechanically operated quickly and sensitively by forming the die A2 flam groove in the same manner as in the past.

The effect of having a good time The present invention produces the following unique effects.

Since the actuator is in a stopped state after operating towards the target value, there are few operating opportunities and the operating time is short, so the life is much longer than that of an automatic control valve.

A pilot-operated pressure reducing valve operates the pilot valve with a small force to open and close the main valve, which requires a large force. Therefore, in this case, since the elastic force of the pressure setting spring is small, the actuator may have a small output.

Since the adjustment screw of the spring is moved forward and backward using an actuator, it can be easily attached to an existing pressure reducing valve.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1).

The automatic setting pressure reducing valve of this embodiment has a mechanical pressure reducing valve section 1.
, an electric motor section, and a control section.

The pressure reducing valve part 1 is similar to the conventional one and is fixed. Flow (book entrance 2
and the outlet 3 are connected and attached to the primary passage/l and the secondary 111i passage 5, respectively. The main valve lower is opened and closed by the main valve body 6. The main valve body 6 is arranged so as to be biased in the valve closing direction by a spring,
It is connected to the piston 8 via the valve stem.

The lower surface of the piston 8 (this is where the fluid pressure on the outlet 3 side acts,
Fluid pressure on the inlet 2 side is controlled by a pilot valve body 12 and introduced into the upper surface through passages 9 and 11. The pilot valve element 12 is biased by a spring in the valve closing direction, contacts the lower surface of the diaphragm 13 via the valve stem, and receives an operating force in the valve opening direction due to its displacement.

Therefore, when the diaphragm 13 is displaced downward, the pilot valve body 12 is pushed down, and the fluid in the inlet 2 is transferred to the passages 9 and 1.
1 and above the piston 8 , the main valve body 6 is pushed down by the piston 8 to open the main valve lower, and the fluid at the inlet 2 flows to the outlet 3 . Further, when the diaphragm 13 is displaced upward, the pilot valve body 12 is pushed up by the spring, the passage 9 is closed, and the fluid above the piston 8 is transferred to the passage 1.
1. Space around the valve stem of the pilot valve body 12, passage 1
0 and escapes to the outlet 3, the piston 8 and the main valve body 6 are pushed up by the spring, and the main valve lower is closed.

The upper part of the diaphragm 13 is connected to the outside air through the pores 14, and the outside air pressure is maintained at a constant level. Further, the lower end of the pressure setting spring 16 comes into contact with the upper surface of the diaphragm 13, and an elastic force acts thereon. The upper end of the pressure setting spring 16 is in contact with the lower end of the adjusting screw 17 via a spring member, and the amount of compression of the pressure setting spring is adjusted by advancing and retreating as the adjusting screw 17 rotates, and the elastic force acting on the diaphragm 13 The force can be adjusted. The adjusting screw 17 is threadedly connected to an internally threaded member attached to the spring receiving case 15, which forms part of the valve casing.

The electric motor section is attached by fixing the yoke member 18 to the spring housing case 15. At this time, adjust screw 17
and the output shaft 20 are aligned on the same axis, and the hexagonal head 42 and the lower end of the output shaft 20 are connected.

The output shaft 20 forms the axis of a pole spline 21, and a locking member 23 is provided at the upper end. A cylindrical connecting member 22 is fixed to the outer peripheral portion vJ]9 of the ball spline 21. (2) A disk 24 is formed at the bottom of the force shaft 20. A position detection sensor 26 is attached to the bottom surface of the mounting base 25, and the detection rod 3
3 is arranged so as to be in contact with the side surface of the disk 24.

An electric motor 29 and a speed reducer 28 are fixed to a mounting base 25, and their output @27 is inserted and fixed into a connecting member 22.

Therefore, when the electric motor 29 is rotated, the output shaft 27 of the reducer 28 rotates, and the outer circumferential member of the spline 21 rotates together with the connecting member 22. According to the direction of rotation, the output @ 20 rotates while moving up and down. Adjusting screw 17 rotates to the right or left.

At the same time, the detection rod 33 of the sensor 26 moves up and down following the up and down movement of the circle/plate 24, and the amount of movement is captured as a position signal.

Place the screwdriver 30 next to the electric motor 29 and remove the cover 3.
6, and take measures to prevent dust and moisture. The illustration of the power line and its inlet is simplified.

The control section uses the above-mentioned position detection sensor "j-26" and the comparative tone i.
iO device 31 and controller 32 for inputting the set pressure meter 1st shift
and a pressure sensor 40 installed in the secondary passage. Reference number 34 is a terminal block, which is connected to the motor driver 30 and the sensor 26. Terminal block 34
Compare the regulator 31 with the signal t, ! 37, the pressure centner 40 is connected to the comparator regulator 31 by a signal line 39 and the regulator 32 is also connected by a signal 65. Three comparators (or controllers) may be placed at the position of the terminal block 34.

The fluid pressure in the secondary passage 5 is detected by a sensor 40 and sent to the controller 32 at all times or at relatively short intervals.

The computer in the controller has a pressure setting spring 16 [
The relationship between the absolute axial position of the adjusting screw 17 that adjusts the main force, the axial displacement of the disk 24, and the set pressure target is recorded, and the desired set pressure target is set through the controller 32. If you enter a value, 82 will be used as the position signal of the adjustment screw.
A constant signal is calculated and sent to the comparison controller 31. The signal from the position detection sensor 26 is compared with the signal from the position detection sensor 26 by the comparison controller, and if the detected deviation value (-) is larger than the difference reference value, it is determined that the deviation is greater than the standard value. A signal for operating this actuator is then sent to the driver 30. Thereafter, the electric motor R29 is operated and the adjusting screw 17 is immediately displaced toward the eye.

(When the output value of the difference detection value reaches zero, that is, when the difference detection value falls within the range of another predetermined minute deviation reference value that is sufficiently smaller than the deviation reference value indicated below.) To, electric front 29
An operation signal to stop the driver 30 is sent to the driver 30. At this time, the comparison loop loops through the comparison controller, the driver, the electric motor, the position detection sensor, and the comparison controller again.

In order to make settings with even higher accuracy, compare the pre-pressure distribution sensor 40's signal 8 with the relationship between the set pressure recorded in the controller and the amount of adjustment screw movement, calculate G1, and then Determine how much the adjustment screw needs to be changed, send the 1π month to the comparative adjuster, and make fine adjustments.

Also, even when the secondary pressure changes due to pressure or load fluctuations, the signal from the pressure sensor 40 is always input, compared, calculated, and finely adjusted.

In this embodiment, a pressure sensor is used for more accurate control, or if more accurate control is not required, it is sufficient without a pressure sensor.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of an electric pressure reducing valve according to an embodiment of the present invention.
This is an overlapping display of the block diagrams of the first part. 1: Pressure reducing valve section 5: Secondary passage 6: Main valve body
8: Piston 12: Pilot valve body 13: Diaphragm 15: Spring housing case 16: Pressure setting spring 17: Adjustment screw
20: Output shaft 21 spline 26: Position detection sensor 27:
Output shaft of deceleration 2: Electric motor 30 driver 31 = Comparison regulator 32: Controller 40: Pressure sensor sound 1 Figure Proceedings rectification document (method) January 1986/Fuday 1, Incident display Showa 61-year patent application No. 167255 2, name of invention automatic setting pressure reducing valve 3, person making amendment

Claims (1)

[Claims] 1. Attach an actuator to the diaphragm structure pressure reducing valve to operate the means for adjusting the elastic force of the pressure setting spring,
A detection interval is provided for converting the axial displacement of the above-mentioned means for adjusting the elastic force of the pressure setting spring into an electric signal, and the relationship between the absolute position of the above-mentioned means and the set pressure target value is stored in a computer, and any arbitrary An automatic setting pressure reducing valve characterized in that the operating displacement amount is calculated from the above relationship with respect to the set pressure, and the above means is operated so as to instantaneously approach the target value.