JPS61228179A - Valve device - Google Patents

Abstract

PURPOSE:To provide a low-cost valve device which produces a high control force only through electric wiring, by a method wherein a pump, pressurizing and feeding compressed fluid, is mounted in an airtight chamber which is partitioned and formed in a valve body by means of a pressure collector. CONSTITUTION:With a switch 21 closed, a current waveform from an a.c. source 22 is half-wave-rectified by a rectifying element 22, a current is intermittently applied on an electromagnetic coil 17, and a piston 16 is moved upward against the force of a spring 15. A pump chamber 18 is enlarged to open an inlet check valve 19, and air is sucked in a pump chamber 18. When the current of the electromagnetic coil 17 is shut off, the piston 16 is moved downward below the spring 15, the pump chamber 18 is contracted to open an outlet check valve 20, and air is pressurized and fed in an airtight chamber 12. In this case, an electromagnetic valve 23 is excited to close a hole 29 with a valve body 24, and therefore, a pressurein an airtight chamber 12 is gradually boosted, a compressed fluid force is gradually exerted on a pressure collector 9 to move downward a valve body 8 to gradually fully close a fluid flow passage.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a valve device that closes a valve body using the pressure of a compressible fluid such as air, and in particular, it is desired that the valve be closed gently when closing. This invention relates to a valve device for large-diameter water.゛"Prior Art" Conventionally, pneumatic valve devices that control the valve body using the pressure of compressed air are often used because they provide a large operating force. The disadvantage is that the valve device as a whole is large and expensive because it must be placed separately from the main body and an air compression supply line must be installed from the compressor to the valve device.

On the other hand, the solenoid valve 1, which opens and closes the valve body using the magnetic force of a coil, is easy to install because the valve device can be installed simply by electrical wiring, but it also requires a large amount of force to operate the valve body and the valve closing time. The drawback was that it could not be controlled.

There is also a so-called biloft solenoid valve that controls the pilot flow path with a solenoid valve and opens and closes the main valve using the force of the fluid flowing through the valve body, but it has the disadvantage that the main valve cannot be opened and closed stably due to fluid pressure fluctuations. .

"Problems to be Solved by the Invention" The valve device of the present invention has been devised in view of such conventional problems, and its purpose is to use the pressure of compressible fluid as the valve closing operation force. The object of the present invention is to provide an inexpensive and novel valve device that can be easily installed using only electrical wiring, and can be easily installed using only electric wiring.

In order to achieve the above-mentioned object, the valve device of the present invention includes a valve body that controls opening and closing of a fluid passage passing through a valve body, and a pressure receiving body fixed to the valve body. In this valve device, a pump is arranged to pressurize and supply a compressible fluid into the airtight chamber.

"Function J: The pump placed in the valve body receives air input and pressurizes the compressible fluid, supplying pressure into the airtight chamber, which closes the valve body. - Releases the pressure inside the airtight chamber. When a closed-when-energized solenoid valve is opened by electrical input, the pressure in the airtight chamber is reduced and the valve body is automatically opened by the force of the spring.

"Embodiment" An embodiment of the valve device according to the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a valve body through which a fluid passage 2 passes, an inlet 3 is opened on the left side, an outlet 4 is opened on the right side, and a valve seat 5 is provided in the middle. A guide hole 6 is formed in the lower side of the valve body 1 facing the valve seat 5, and a stem 7 is disposed within the guide hole 6 so as to be movable in the vertical direction. A valve body 8 for opening and closing the valve seat 5 is disposed at a position facing the valve seat 5 of the stem 7, and a diaphragm serving as a pressure receiving body 9 is disposed roughly at the upper end of the stem 7. The outer periphery of the diaphragm is held between the valve body 1 and the cover 11, and an airtight chamber 12 is defined by the diaphragm and the cover 1. Reference numeral 13 denotes a spring for pressing the valve body 8 in a direction away from the valve seat 5, and is contracted at the lower end of the stem.

The airtight chamber 12 is filled with compressible fluid such as air.
A pump 14, such as an electromagnetic pump, is arranged to supply the inside of the pump 2.

The pump 14 drives and controls a piston 18 that is pressed downward by a spring 15 using magnetic force generated by an alternating current half-wave rectified current that is repeatedly input to an electromagnetic coil 17.
8, an inlet check valve 19 is disposed at the inlet of the pump chamber, and an outlet check valve 20 is disposed at the outlet of the pump chamber. The coil 17 of the pump 14 is connected to an AC power source 22 via a switch 21.

A rectifying element 22 is connected between the chain 21 and the coil 17. Furthermore, a solenoid valve 23 that is closed when energized is arranged in the air chamber 12 to release the compressible fluid in the airtight chamber 12.
The valve body 24 of No. 3 is fixed to a movable core 25, and the movable core is always pressed upward by a spring 2B. The electromagnetic coil 27 is connected to the AC power source 22 via the switch 21, and the movable core 25 is attracted downward by the magnetic force generated in the electromagnetic coil 27, and the valve body 24 closes the hole 29 of the airtight chamber.

Next, its effect will be explained.

First, the state in which the switch 21 is open as shown in the figure will be described. The valve body 28 of the solenoid valve 23 is urged upward by the force of the spring 2B, and the valve body 28 holds the hole 29 in the open state. On the other hand, since the electromagnetic coil 17 of the pump 14 is not energized, the pump 14 is also not driven in the same manner.Therefore, the stem 7 is urged upward by the spring 13, and according to this, the valve body 8 is moved from the valve seat 5. They are held apart, and the fluid flow path 2 becomes open, allowing fluid to flow down from the inlet 3 to the outlet 4.

When the switch 21 is closed, the current waveform from the AC power supply 22 is half-wave rectified by the rectifier 22, and the electromagnetic coil 17
When a current is applied to the electromagnetic coil 17, the piston 16 moves upward against the force of the spring 15, the pump chamber 18 expands, and the inlet check valve 19 opens. , air is drawn into the pump chamber 18.

When the current in the electromagnetic coil 17 is cut off, the spring 1
5, the piston 1B moves downward, the pump chamber 18 contracts, the outlet check valve 20 opens, and air is supplied into the airtight chamber 12 under pressure. At this time, the solenoid valve 23 is energized and the valve body 24 closes the hole 29, so the pressure inside the airtight chamber 12 gradually increases, compressive fluid force gradually acts on the pressure receiving body 9, and the valve body 8 gradually close the fluid flow path.

The effective pressure receiving diameter of the diaphragm as the pressure receiving body 9 is set to be approximately the same as the valve seat diameter d, so the fluid force acts on the diaphragm to open the valve, and the fluid force acts on the valve body. The force acting to close the valve is approximately the same, and the force required to open and close the valve body (the force of the spring 13, the pressure in the airtight chamber 12) may be a relatively small force.

"Effects of the invention" - Fluid force with large air pressure can be used as valve operating force,
In the arrangement of the valve device, since only simple electrical wiring is required, reliable valve operation is possible at low cost.

■Using the increased pressure of compressible fluid as the valve closing force,
When used as a water valve device, it can be closed slowly and completely suppress the water phenomenon, making it suitable for large-diameter water control.

Since a 0-pass electromagnetic closing type solenoid valve is arranged, it is easy to release the pressure inside the airtight chamber, and the valve opening operation becomes easy.

■Since the valve opening force that fluid force acts on the pressure receiving body and the valve closing force that fluid force acts on the valve body are balanced, the spring force and the pressure in the airtight chamber can be small, making it suitable for large-diameter valve devices. It can be used.

[Brief explanation of drawings]

The figure is a longitudinal sectional view including an electric circuit diagram showing one embodiment of the valve device of the present invention. 151. Valve body, 801. Valve body, 993. pressure receiving body,
+2. ,, Airtight room, 14. ,,pump,23,,
,solenoid valve

Claims (1)

[Claims] 1. A valve body that controls opening and closing of a fluid flow path passing through the valve body;
In a valve device including a pressure receiving body fixed to the valve body and an airtight chamber defined within the valve body by the pressure receiving body, a pump is arranged to supply pressurized compressible fluid to the airtight chamber, A valve device that closes a valve body by increasing the pressure of compressible fluid in an airtight chamber. 2. A valve body that controls opening and closing of a fluid flow path passing through the valve body;
In a valve device including a pressure receiving body fixed to the valve body and an airtight chamber defined in a valve body by the pressure receiving body, a pump is arranged to supply pressurized compressible fluid into the airtight chamber, and A valve device equipped with a solenoid valve that closes when energized to release the pressure in an airtight chamber. 3. A valve body that controls opening and closing of a fluid flow path that penetrates the valve body;
In a valve device including a pressure receiving body fixed to the valve body and an airtight chamber defined in a valve body by the pressure receiving body, a pump is arranged to supply pressurized compressible fluid into the airtight chamber, and , the valve opening force that the pressure receiving body receives due to the fluid force,
A valve device in which the valve closing force applied to the valve body by fluid force is approximately the same.