JPH0631648B2 - Valve device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a valve device that closes a valve body by using the pressure of a compressive fluid such as air, and in particular, it is desired that the valve device is gently closed. The present invention relates to a valve device for large-diameter water.

[Prior Art] Conventionally, a pneumatic valve device that controls a valve element by the pressure of compressed air is often used because a large operating force is obtained, but a compressor that supplies compressed air to the valve device is a valve body. However, it has a drawback that the valve device as a whole is large in size and high in cost because it has to be arranged separately from the compressor and the air compression supply pipe line has to be provided from the compressor to the valve device.

On the other hand, the solenoid valve that opens and closes the valve body by the magnetic force of the coil,
Although it is simple because the valve device can be installed only by electric wiring, there are drawbacks that a large force cannot be obtained as the operating force of the valve element and the valve closing time cannot be controlled.

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

[Problems to be Solved by the Invention] A valve device according to the present invention has been made in view of the above problems in the related art, and an object thereof is to utilize the pressure of a compressive fluid as a valve closing operation force. Therefore, a large operating force is obtained, and on the other hand, when installing the valve device, it is possible to provide an inexpensive new valve device that can be easily installed only by electric wiring.

[Means for Solving the Invention] In order to achieve the above-mentioned object, the present invention has an inflow passage in which a fluid passage is formed so as to penetrate therethrough, and a valve seat provided in the fluid passage connects to an inflow passage. A valve body having an opening that opens upward in the inflow passage that includes the valve seat, and a pressure receiving body that closes the opening of the valve body at the top. A valve body that is arranged below the pressure receiving body and that can open and close the valve seat, and a stem with a spring that urges the valve body to open the valve seat, and a pressure receiving surface that covers the opening of the valve body A cover that is placed on the upper surface of the body and forms an airtight chamber with the upper surface of the pressure receiving body, a pump that supplies pressurized fluid into the airtight chamber, and an energization that closes a leak hole that opens into the airtight chamber when energized. Closed type solenoid valve and a valve device composed of Is.

[Action]

When the valve seat is closed by the valve body, the pump is driven and the solenoid valve closes the leak hole.

When the pump is driven, the pressure in the hermetic chamber rises, and the pressure receiving body receives this increased pressure and moves downward against the spring force of the spring, so that the valve body closes the valve seat.

On the other hand, when the valve seat is opened, driving of the pump is stopped and the solenoid valve opens the leak valve.

According to this, the pressure in the airtight chamber leaks through the leak hole and disappears, and the valve body opens the valve seat by the spring 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 having a fluid passage 2 penetrating the inside thereof, and an inlet 3 is provided on the left side thereof, an outlet 4 is opened on the right side thereof, and a valve seat 5 is provided at an intermediate portion thereof. The passage 2 is divided by a valve seat 5 into an inflow passage 6 connected to the inflow port 3 and an outflow passage 7 connected to the outflow port 4.

Further, the inflow passage 6 including the valve seat 5 is formed with an opening 8 that opens upward.

9 penetrates the inside of the valve seat 5, and the upper part is arranged in the inflow passage 6,
The stem is a stem whose lower part is arranged in the outflow passage 7 and whose lower end is guided in the guide hole 10. The stem 9 is allowed to move in the vertical direction and is urged upward by the spring 11 in the figure. It

The stem 9 does not necessarily need to be guided and supported in the guide hole 10 and the spring 11 does not need to be contracted in the guide hole 10. In short, the stem 9 is biased by an upward elastic force. It should be done.

The pressure receiving body 1 such as a diaphragm is provided on the upper end of the stem 9.
2 is attached, and the valve body 13 for opening and closing the valve seat 5 is attached to the stem 9 below the pressure receiving body 12.

The pressure receiving body 12 is arranged on the opening 8 of the valve body 1 to close the opening 8. A cover 14 is arranged on the outer periphery of the upper surface 12A of the pressure receiving body 12, and the outer periphery of the pressure receiving body 12 is It is attached to the valve body 1 via the cover 14.

According to the above, the airtight chamber 15 is formed by the upper surface 12A of the pressure receiving body 12 and the cover 14 covering it, and the stem 9
Is urged upward by the spring 11, the pressure receiving body 12 is in the upper position, and the valve body 13 is in the valve seat 5
Open and hold.

The cover 14 is pressurized with a compressive fluid such as air to seal the airtight chamber 1.
A pump P, such as an electromagnetic pump, for supplying into the inside 5 is arranged.

The pump P drives and controls the piston 21, which is biased downward by the spring 20, by the magnetic force generated by the alternating half-wave rectified current repeatedly input to the electromagnetic coil 22, and the pump chamber 23.
The pump chamber inlet 24 has an inlet check valve 25, the pump chamber outlet 26 has an outlet check valve 27, and the pump chamber outlet 26 is connected to the airtight chamber 15. The electromagnetic coil 22 of the pump P is connected to the AC power supply 29 via the switch 28, and the switch 28 and the electromagnetic coil 2 are connected.
A rectifying element 30 is connected between the two. Further, the cover 14 is provided with an energization time type solenoid valve V that releases the compressive fluid in the airtight chamber 15.

The valve body 40 of the solenoid valve V is fixed to a movable iron core 41, and the movable iron core is constantly urged upward by a spring 42. The electromagnetic coil 43 is connected to the AC power supply 29 via the switch 28, and the magnetic force generated in the electromagnetic coil 43 causes the movable iron core 4 to move.
1 is sucked downward, and the valve body 40 closes the leak hole 44 opening in the airtight chamber 15.

Next, the operation will be described.

First, the state where the switch 28 is opened as shown in the figure will be described. The valve body 40 of the solenoid valve V is urged upward by the force of the spring 42, and the valve body 40 holds the leak hole 44 in the open state. On the other hand, since the electromagnetic coil 22 of the pump P is not energized, the pump P is never driven. Therefore, the pressure in the airtight chamber 15 is maintained at the atmospheric pressure, so that the stem 9 is biased upward by the spring 11. According to this, the valve body 13 is held away from the valve seat 5 and the fluid flow is maintained. The passage 2 is opened and the fluid flows from the inflow port 3 to the outflow port 4.

Next, when the switch 28 is closed, the current waveform from the AC power supply 29 is half-wave rectified by the rectifying element 30, and the current is intermittently applied to the electromagnetic coil 22 of the pump P. When a current is applied to the electromagnetic coil 22, the piston 21 moves upward against the force of the spring 20, the pump chamber 23 expands, the inlet check valve 25 opens, and air is drawn into the pump chamber 23. .

When the electric current of the electromagnetic coil 22 is cut off, the spring 2 as shown in FIG.
With the force of 0, the piston 21 moves downward, the pump chamber 23 contracts, the outlet check valve 27 opens, and air is pressurized and supplied from the pump chamber outlet 26 into the airtight chamber 15. At this time, since the solenoid valve V is excited and the valve body 40 closes the leak hole 44, the pressure in the airtight chamber 15 gradually increases, and the compressive fluid force gradually acts on the pressure receiving body 12 to cause the slam 9 to flow. At the same time, the valve body 13 is moved downward toward the valve seat 5 to gradually close the fluid flow path completely.

Since the effective pressure receiving diameter D of the diaphragm as the pressure receiving body 12 is set to be substantially the same as the valve seat diameter d, the fluid force acts on the diaphragm to open the valve and the fluid force acts on the valve body. And the force to close the valve is almost the same, and the force required to open and close the valve body (spring force, pressure in the airtight chamber)
Requires a relatively small force.

[Advantages of the Invention] A fluid force with a large air pressure can be used as a valve operating force,
In the arrangement of the valve device, only simple electric wiring is used, so that inexpensive and reliable valve operation can be performed.

Since the boosting force of the compressive fluid was used as the valve closing force,
When used as a water valve device, the closure can be loosened and the water hammer phenomenon can be completely suppressed, which is suitable for large-diameter water control.

Since the solenoid valve is closed when energized, the pressure inside the airtight chamber can be easily released and the valve opening operation is facilitated.

Since the valve opening force exerted on the pressure receiving body by the fluid force and the valve closing force exerted on the valve body by the fluid force are balanced, the spring force and the pressure in the airtight chamber can be small, so that it can be used for a large-diameter valve device Can be achieved.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view including an electric circuit diagram showing an embodiment of the valve device of the present invention. 1 ... Valve body 2 ... Fluid flow path 3 ... Inflow port 4 ... Outflow port 5 ... Valve seat 6 ... Inflow passage 7 ... Outflow passage 8 ... Opening portion 9 ... Stem 11 ... Spring 12 ...... Pressure receiving body 12A ...... Pressure receiving body upper surface 13 ...... Valve body 14 ...... Cover 15 ...... Airtight chamber 44 ...... Leak hole P ...... Pump V ...... Solenoid valve

Claims (2)

[Claims] 1. An inflow passage 6 communicating with an inflow port 3 and an outflow passage communicating with an outflow port 4 at a valve seat 5 provided inside the fluid flow passage 2 and having a fluid flow passage 2 penetrating therethrough. 7 and the valve seat 5
The valve body 1 having the opening 8 that opens upward and the pressure receiving body 12 that closes the opening 8 of the valve body 1 are arranged in the inflow passage 6 including A stem 9 provided with a valve body 13 capable of opening and closing the valve seat 5 and provided with a spring 11 for urging the valve body 13 to open the valve seat 5, and a pressure receiving body covering an opening 8 of the valve body 1. A cover 14 which is disposed on the upper surface 12A of the pressure receiving body 12 and forms an airtight chamber 15 with the upper surface 12A of the pressure receiving body 12, a pump P which supplies a pressurized fluid into the airtight chamber 15, and an opening toward the airtight chamber 15. And a solenoid valve V of a closed energization type that closes the leak hole 44 when energized. 2. An inflow passage 6 connected to an inflow port 3 and an outflow passage connected to an outflow port 4 by a valve seat 5 provided in the fluid flow path 2 and having a fluid flow path 2 penetrating therethrough. 7 and the valve seat 5
The valve body 1 having an opening 8 that opens upward and the pressure receiving body 12 that closes the opening 8 of the valve body 1 are arranged in the upper part of the inflow passage 6 including the pressure receiving body 12 below the pressure receiving body 12. A stem 9 provided with a valve body 13 capable of opening and closing the valve seat 5 and provided with a spring 11 for urging the valve body 13 to open the valve seat 5, and a pressure receiving body covering an opening 8 of the valve body 1. A cover 14 which is arranged on the upper surface 12A of the pressure receiving body 12 and forms an airtight chamber 15 with the upper surface 12A of the pressure receiving body 12, a pump P which supplies a pressurized fluid into the airtight chamber 15, and an opening toward the airtight chamber 15. And a solenoid valve V of an energized closed type that closes the leak hole 44 when energized. The pressing force on the open side of the valve body 13 which the pressure receiving body receives by the fluid pressure in the inflow passage 6, and the valve body Is blocked by the fluid pressure in the inflow passage 6 Valve device being characterized in that the pressure is substantially the same.