JPS5850379A - Fluid control valve - Google Patents

Abstract

PURPOSE:To maintain a damper function automatically by allwoing a float having a shut-iff function and the specific gravity less than that of an operating fluid to work as the valve element of a check valve so as to discharge the air in a vibration proofing damper chamber automatically. CONSTITUTION:A float 16 made of a resin, hollow ball, etc. with the specific gravity less than that of an operating fluid is made to work as a valve element 15 having a valve element connecting hole 12, check valve seat 13, and external thread section 14 of a check valve. When the unit is started operating, the operating fluid flows into the valve element 15, and flows into a damper chamber 24 through the connecting hole 12, etc. The float 16 closes the valve seat 13 at the place where it gets into contact with the valve seat 13, and furthermore, the spaces inside the valve including the damper chamber 24 are all filled with the operating fluid. Thereby, the damper works normally and can prevent an abnormal vibration of the valve element caused by the presence of the air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic air venting means for a damper chamber of a damper for preventing vibration of a fluid control valve.

In order to prevent abnormal vibration of the valve body of a fluid control valve, a vibration prevention damper based on the so-called Dashbot principle is used, which has a small communication hole with the outside and is filled with fluid in a virtually sealed state. However, in order to fully utilize the performance of this anti-vibration damper, when the fluid is a liquid, it is safe to ensure that there is no air in the damper chamber.

To do this, conventionally, at the start of operation, it was necessary to operate the air bleed valve or liquid injection valve to bleed out the air inside the valve, especially the damper chamber, which not only complicated the operation at the start of operation, but also made the valve large. The cost was high.

The present invention automatically extracts the air in the damper chamber by operating a float with a shutoff function and a small specific gravity of the working fluid as the valve body of the inverted Il valve, and then It automatically maintains the damper function by keeping it in a nearly sealed state.

FIG. 1 shows one embodiment of the invention, and FIG. 2d shows another embodiment of the invention. First, referring to FIG. 1, the structure of an embodiment of the present invention will be explained.

Reference numeral 1 designates a valve body having an inlet port 12, an outlet port 3, a valve seat 4, and a valve chamber 5 formed inside. A cylinder 6 is connected to the lower part of the valve body 1, and a damper body 7 is connected to the bottom IRA of the cylinder 6. A pressure regulating screw 8 is fitted to the lower end of the damper body 7. Said cylinder 6
A yoke 9, a yoke plate 10,
An electromagnetic coil 11 is provided. On the other hand, in a vertically elongated cylindrical space composed of spaces such as the valve chamber 5, the inside of the cylinder 6, and the inside of the damper body 7, there are a valve body communication hole 12, a check valve valve A valve body 15 having a seat 13 and a male threaded portion 14, a stretcher 16 such as a resin or hollow ball having a specific gravity lower than that of the working fluid, an electromagnetic plunger 18 having a female threaded portion at the end of the plunger communication hole 17, and a male threaded portion 19. Spring seat 20. A pressure regulating spring 21 is provided. 22 is valve body 1
5 and the electromagnetic plunger 18: a first sliding ring 23 made of a low-friction material such as fluorine resin;
This is a second sliding ring made of a low-friction material such as fluororesin and fixed by a spring seat 20 and an electromagnetic plunger 18. The space indicated by 24 becomes a damper chamber. Further, 25 is a floating support for the plunger connection to prevent it from being exposed to the outside of the hole 17.

Next, the operation will be explained. First, the basic operation of the valve will be explained. When the electromagnetic coil 11 is energized by passing a full current of 1, the electromagnetic plunger 18, that is, the valve body 15 fixed to the electromagnetic plunger 18, is driven upward and attempts to come into contact with the valve seat 4. The flow from the inflow 2 to the outflow 3 is restricted and the pressure on the flow side of the valve is kept constant. Even when the current 1 is changed, the pressure is determined by the relationship between the force that drives the valve body 15 and the pressure flow characteristics of the fluid supply source (not shown) on the upstream side of the valve. That is, this fluid control valve performs an operation to determine the pressure on the upstream side of the valve in accordance with the current value of the electromagnetic coil 11.

Next, the automatic air purge operation within the valve body, particularly the damper chamber 24, which is the gist of the present invention, will be explained in detail. For convenience of explanation, the operation of the damper will be explained first. The damper chamber 24 is a float 16
The first sliding ring 22 and the second sliding ring 22 are connected to the valve chamber 5.
The valve chamber 6 is closed by a small gap between the sliding ring 23 and the cylinder 6.
For example, if the valve body 16 abnormally moves downward from its normal balanced state for some reason, it will pass through the slight gap between the sliding ring 22, 23 and the cylinder 6 and move into the damper chamber 24. Since the fluid needs to pass through to the valve chamber 5, the operation of the valve body 15 becomes slow. This is the basic operation of the damper.

Next, the automatic air venting operation in the damper chamber 24, which is the object of the present invention, will be explained. When the device starts operating or after internal inspection or cleaning, there is no working liquid in the valve body, so the float 16 has fallen to the float receiver 25. When the device starts operating, the working liquid flows into the valve body, and the valve body communication hole 1
2. It flows into the damper chamber 24 via the check valve seat 13 and the like.

As the liquid gradually fills up, the float 16, which has a lower specific gravity than the working fluid, rises from the position indicated by the broken line. The float 16 closes the check valve seat 13 at the position where it comes into contact with the check valve seat 13 (the position shown by the solid line).

Further, the working liquid fills the valve body communication hole 12 and the valve chamber 5, and all of the valve internal space including the damper chamber 24 is filled with the working liquid. In this state, the above-mentioned damper operates normally to prevent abnormal vibrations.

As is clear from the embodiment described above, the present invention connects a working fluid passage section including a damper chamber and a valve chamber 6 which is open to approximately atmospheric pressure with two valves (Ja, L) to prevent the reverse. The entire valve body of the valve is floated in the working fluid, and automatic air purge operation is performed.After the air purge is completed, the check valve is activated immediately to prevent abnormal vibrations of the valve body from occurring in one direction. The damper chamber is in a closed state and fully utilizes its damper function, mitigating abnormal vibrations.

In one embodiment of FIG. 1, the check valve seat 13 is provided as a part of the valve body 15, but considering the operating principle (11), the spring IIZ2
0, a part of the electromagnetic plunger 18, or as shown in FIG. 2, a bypass pipe 26 is provided outside the valve body, and a valve seat is provided in the middle of the bypass pipe 26 so that it floats on the working fluid. It is also possible to configure the check valve 27 with a valve body having a shape of 1.5 mm, and the check valve 27 is not limited to that shown in FIG.

As explained above, the present invention communicates the damper chamber with the working fluid passage section opened to approximately dog pressure via the reverse +J- valve,
Automatic venting of the damper chamber is performed by floating the valve body of the check valve in the working fluid, and it is a useful invention since it does not require power CI for operation and has a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a fluid control valve according to an embodiment of the present invention, and FIG.
The figure is a configuration diagram of another embodiment of the present invention. 2. Inlet, 3. Outlet, 4. Valve seat, 5.
- Valve chamber, 6... Cylinder, 13... Check valve seat, 1S-... Valve body, 16... Float, 18 Electromagnetic plunger, 24... Damper chamber.

Claims (3)

[Claims] (1) One end of the cylinder is connected to a valve chamber having an inlet] and an outlet provided with a valve seat, and the other end is connected to a damper chamber whose one end is sealed, and inside the cylinder =! 1
a fluid control valve, wherein an electromagnetic plunger having a valve body facing a valve seat is provided, and the valve chamber and the damper chamber are communicated through a communication passage having a check valve having a float having a specific gravity smaller than that of the working fluid. (2) The fluid control valve according to claim 1, wherein a communication path is provided inside the valve to communicate a valve chamber having a check valve with a damper chamber. (3) The fluid control valve according to claim 2, wherein at least a portion of the communication passage connecting the valve chamber and the damper chamber is provided inside the electromagnetic plunger.