JPH0150790B2 - - Google Patents

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 vibrations of the valve body of a fluid control valve, a vibration prevention damper based on the principle of a so-called dart pot, which has a small communication hole with the outside and is filled with fluid in an almost sealed state, is sometimes used. However, in order to fully demonstrate the performance of this anti-vibration damper, when the fluid is a liquid, it is necessary that no air exists in the damper chamber. For this purpose, in the past, an air vent valve was used at the start of operation.
Alternatively, it is necessary to operate the liquid injection valve to bleed out the air inside the valve, especially the damper chamber, which not only complicates the operation at the start of operation, but also increases the size and cost of the valve.

The present invention automatically exhausts the air inside the damper chamber by operating a float with a shutoff function, which has a specific gravity smaller than that of the working fluid, as a valve body of a check valve, and then closes the damper chamber almost completely. This automatically maintains the damper function by maintaining the condition.

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

A valve body 1 has an inlet 2, an outlet 3, and a valve seat 4, and has 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 lower end of the cylinder 6.
A pressure adjusting screw 8 is fitted to the lower end of the damper body 7. A yoke 9, a yoke upper plate 10, and an electromagnetic coil 11 are provided concentrically on the outer circumference of the cylinder 6. On the other hand, in a vertically elongated, almost cylindrical space consisting of spaces such as the valve chamber 5, the inside of the cylinder 6, and the inside of the damper body 7, there are, from the top, a valve body communication hole 12, a check valve seat 13, and a male thread. A valve body 15 having a portion 14, a resin having a specific gravity smaller than that of the working fluid,
Float 16 such as a hollow ball, plunger communication hole 17
An electromagnetic plunger 18 having a female threaded portion at its end, a spring seat 20 having a male threaded portion 19, and a pressure regulating spring 21 are provided. 22 is a first sliding ring made of a low-friction material such as fluorine resin, which is fixed by the valve body 15 and the electromagnetic plunger 18; 23 is a first sliding ring which is fixed by the spring seat 20 and the electromagnetic plunger 18; The second one is made of low-wear materials such as base resin.
This is a sliding ring. The space indicated by 24 becomes a damper chamber. Further, reference numeral 25 denotes a float receiver for preventing the float from coming out of the plunger communication hole 17.

Next, the operation will be explained. First, the basic operation of the valve will be explained. When the electromagnetic coil 11 is excited by passing a current i, the electromagnetic plunger 18, that is, the valve body 15 fixed to the electromagnetic plunger 18, is driven upward and tries to come into contact with the valve seat 4. Therefore, the flow from the inlet 2 to the outlet 3 is restricted, and the pressure on the upstream side of the valve becomes constant. Even when the current i is changed, the pressure is determined by the relationship between the force that drives the valve seat 15 upward 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. For convenience of explanation, the operation of the damper itself will be explained first. The damper chamber 24 is isolated from the valve chamber 5 by a float 16, and communicates with the valve chamber 5 through a small gap between the first sliding ring 22, the second sliding ring 23, and the cylinder 6. For example, the valve body 15 If for some reason the fluid in the damper chamber 24 tends to abnormally move downward from its normal balanced state, it is necessary for the fluid in the damper chamber 24 to pass through the valve chamber 5 through a slight gap between the sliding rings 22 and 23 and the cylinder 6. Therefore, 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 operation of the device is started, the working liquid flows into the valve body and flows into the damper chamber 24 through the valve body communication hole 12, 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, as described above, the damper operates normally to prevent abnormal vibrations.

As is clear from the embodiment described above, the present invention communicates the damper chamber with the working fluid passage section including the valve chamber 5 which is open to approximately atmospheric pressure by means of a check valve, and furthermore, the valve body of the check valve is Floating on the working fluid, automatic air bleed operation is performed, and after the air bleed is completed, the check valve is operated immediately, and the damper chamber becomes almost closed in one direction to prevent abnormal vibration of the valve body. fully utilizes its damper function to alleviate abnormal vibrations.

In one embodiment of FIG. 1, the check valve seat 13 is connected to the valve body 15.
However, considering the principle of operation, it may be possible to provide a part of the spring seat 20, a part of the electromagnetic plunger 18, or a bypass pipe outside the valve body as shown in Fig. 2. It is also possible to configure the check valve 27 by providing a check valve 26 and a valve body provided with a valve seat in the middle so that it floats on the working fluid, and is not limited to that shown in FIG.

As explained above, the present invention communicates the damper chamber with the working fluid passage section which is open to approximately atmospheric pressure via the check valve, and allows the valve body of the check valve to float in the working fluid to automatically control the damper chamber. This is a useful invention because it bleeds air, does not require power for operation, and has a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a fluid control valve according to one embodiment of the present invention, and FIG. 2 is a configuration diagram of another embodiment of the present invention. 2...Inflow port, 3...Outflow port, 4...Valve seat, 5
... Valve chamber, 6 ... Cylinder, 13 ... Check valve seat, 15 ... Valve body, 16 ... Float, 18 ... Electromagnetic plunger, 24 ... Damper chamber.

Claims (1)

[Claims] 1 One end of a 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 in a sealed state. An electromagnetic plunger having a valve body facing the valve seat is provided at one end, and the valve chamber and the damper chamber are connected to each other.
A fluid control valve that has a check valve having a float having a specific gravity smaller than that of the working fluid and communicates with the fluid through a communication passage. 2. The fluid control valve according to claim 1, wherein a communication passage communicating between a valve chamber having a check valve and a damper chamber is provided inside the valve. 3. The fluid control valve according to claim 2, wherein at least a portion of the communication passage communicating the valve chamber and the damper chamber is provided inside the electromagnetic plunger.