JPH0492172A - Float fitting structure of air valve - Google Patents

Abstract

PURPOSE:To operate a valve member stably without influence of liquid level fluctuation in an air valve, of which valve body is opened and closed by ascent/ descent of a float inside a valve box, by providing a float at an appropriate position in the vertical direction of a valve rod to be moved freely between locking parts. CONSTITUTION:A float 16 receives the floating force of the fluid flowed into a valve box 1 and is raised, and when the float 16 is raised to a position for engagement with an upper pin 14 of a valve rod 11, the float 16 pushes the valve rod 11 up through the pin 14 to close a valve body 5. When the air is stored in the valve box 1, a liquid level is lowered, and when the float 16 is lowered to a position for engagement with a lower pin 15 of the valve rod 11, the float 11 pushes the valve rod 11 down to open a small air hole 9. The pressure inside the valve box 1 is transmitted to a pressure chamber 10 to lower the valve body 5 smoothly, and the air is discharged from a large air hole 7, and a liquid level is raised again to close the valve body 5. At this stage, even if a liquid level is raised and lowered disorderly with the energy of the liquid, only the float 16 is moved vertically between the described upper and lower pins 14, 15, and excessive switching of the valve body 5 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a float mounting structure for an air valve installed in the middle of water and sewerage pipes.

Conventional technology Conventionally, air valves installed in the middle of water and sewage pipes, etc.
For example, it was as shown in Figure 3. In FIG. 3, fluid flowing through piping (not shown) flows into the interior of the valve housing 1 through an inflow hole 2 formed at the bottom of the valve housing 1. Then, the valve stem 4 is lifted together with the float 3 by the buoyant force received from the fluid, and the large air hole 7 formed in the large air hole valve seat 6 is closed by the valve body 5 provided at the upper end of the valve stem 4. Further, the valve stem 4 is supported by the valve body 5 so as to be able to rise and fall by a predetermined distance, and the upper end of the valve body 5 is held by the diaphragm 8, and the small air hole 9 formed in the valve body 5 is connected to the pressure chamber lO of the diaphragm 8.
and communicates with valve box 1. Therefore, the small air hole 9 is closed at the tip of the valve stem 4 when the valve stem 4 is raised.

Then, when air flows into the valve body 1 from the inflow hole 2, the liquid level inside the valve body 1 drops, the valve rod 4 descends together with the float 3, and the small air hole 9 of the valve body 5 is opened. The pressure inside the valve body 1 is transferred to the diaphragm 8 through the small air hole 9.
is transmitted to the pressure chamber lO.

Therefore, the internal pressure of the valve box 1 acts in opposite directions through the small air hole 9 on the valve body 5, which is pressed against the large air hole valve seat 6 due to the pressure difference between the internal pressure of the valve box 1 and atmospheric pressure. The valve body 5 is smoothly pulled down by its own weight and the weight of the valve stem 4 and float 3, and the air remaining inside the valve body 1 is discharged to the outside through the large air hole 7.

Problems to be Solved by the Invention However, according to the conventional configuration described above, the liquid level rises and falls erratically due to the force of the fluid flowing into the inside of the valve body 1 when the valve body 5 opens and closes, and the large air hole 7 and the small If the liquid surface ripples due to air bubbles flowing into the valve box when the air hole 9 is blocked, the float 3 will react hypersensitively and the valve body 5 will open and close frequently, preventing normal operation. There was a problem that made it impossible to do so.

The present invention solves the above problems, and aims to provide a float mounting structure for an air valve that allows the valve body to operate stably without being affected by disturbances in the liquid level within the valve box. .

Means for Solving the Problems In order to solve the above problems, the present invention provides an air valve in which a valve stem is moved up and down by raising and lowering a float arranged in a valve box to open and close a valve body. It is configured to be movable between locking portions provided at appropriate positions.

Further, a buffer member is interposed between the float and the upper locking portion.

Operation With the above-described configuration, the float, which receives buoyant force from the fluid flowing into the valve box, pushes up the valve stem via the upper locking portion and closes the valve body. Also, when air flows into the valve box, the liquid level inside the valve box falls, and the float first falls until it engages with the lower locking part of the valve stem, and then the valve stem is pulled down with the float. This causes the valve body to open. Then, as the valve body opens, the air inside the valve box is discharged to the outside, and as the air is discharged, fluid flows into the valve body, the liquid level rises, and the valve body is closed again. At this time, when the liquid level rises and falls turbulently due to the force of the fluid, or when the liquid level is rippled due to air bubbles, only the float moves up and down between the upper and lower locking parts of the valve stem, causing the turbulence in the liquid level. absorbs and prevents excessive opening and closing of the valve body. During this time, the valve body and valve stem are maintained in a closed state by the pressure difference between the inside and outside of the valve body.

In addition, when the float moves up and down between the upper and lower locking parts due to disturbances in the liquid level, a buffer member interposed between the upper locking part and the float keeps the valve stem upward relative to the float. By energizing the valve body and valve stem, the closed state of the valve body and valve stem can be maintained more reliably.

EXAMPLE An example of the present invention will be described below based on the drawings. Third
Components that perform the same actions as those shown in the figures are not shown and will be described using the same reference numerals.

In FIG. 1, the valve stem 11 is a support pin 1 provided on the valve body 5.
It is provided so that it can be raised and lowered by a certain distance by engaging the elongated hole 13 with the valve body 2, and is formed so as to close the small air hole 9 formed in the valve body 5 at its upper end. A pair of pins 14.15 forming locking parts are provided at appropriate positions above and below the valve stem 11, and a float 16 loosely fitted onto the valve stem 11 is attached to both pins 14.15. It is provided in such a way that it can be raised and lowered freely.

Hereinafter, the effects of the above configuration will be explained.

The float 16 receives buoyancy from the fluid flowing into the valve body 1 from the inlet hole 2, and the float 16 is buoyed by the fluid flowing into the valve body 1 from the inflow hole 2.
1 to close the small air hole 9 of the valve body 5, and close the valve body 5 to close the large air hole 7.

Then, when air flows into the inside of the valve body 1 from the inflow hole 2, the liquid level in the valve body 1 decreases, and the float 16 first moves to the valve stem 11.
The float 1B and the valve stem 11 descend together until they engage with the lower pin 15, and the small air hole 9 is opened. At this time, the pressure inside the valve box 1 is transmitted to the pressure chamber lO of the diaphragm 8 through the small air hole 9, and the valve is pressed against the large air hole valve seat 6 due to the pressure difference between the internal pressure of the valve box 1 and atmospheric pressure. The internal pressure of the valve body 1 acts on the body 5 in opposite directions, and the valve body 5 is smoothly pulled down by its own weight and the weight of the valve stem 11 and float 16, and remains inside the valve body 1 through the large air hole 7. air is exhausted to the outside. Then, as the air is discharged, fluid flows into the inside of the valve box 1, the liquid level rises, and the valve body 5 is moved to close again.

At this time, when the liquid level fluctuates wildly due to the force of the fluid, or when the liquid surface ripples due to air bubbles, only the float 16 moves up and down between the upper and lower bottles 14 and 15 of the valve stem 11, and the liquid This absorbs disturbances in the position and prevents excessive opening and closing of the valve body 5. During this time, the valve body 5 and the valve stem 11 are maintained in a closed state in which the large air hole 7 and the small air hole 9 are closed due to the pressure difference between the inside and outside of the valve body 1 .

FIG. 2 shows another embodiment of the present invention, in which the valve stem 1
A spring 17 is interposed as a buffer member between the upper bottle 14 of 1 and the flow IG.

According to this configuration, when the flow [8 moves up and down between the upper and lower bins 14 and 15 due to a disturbance in the liquid level, the spring [7] always urges the valve stem 11 upward against the float I6. Therefore, the closed state of the valve body 5 and the valve stem 11 can be maintained more reliably.

Effects of the Invention As described above, according to the present invention, when the liquid level fluctuates wildly due to the force of the fluid or when the liquid surface is rippled due to air bubbles, only the float can lock the top and bottom of the valve stem. By moving up and down between the sections to absorb disturbances in the liquid level, excessive opening and closing movement of the valve body can be prevented.

Moreover, since the buffer member always urges the valve stem upward with respect to the float, the closed state of the valve body and the valve stem can be maintained more reliably.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing a float mounting structure in one embodiment of the present invention, Fig. 2 is a main part configuration diagram in another embodiment of the invention, and Fig. 3 is an overall configuration diagram showing a conventional air valve. It is a diagram. II...Valve body, 14.15...Bin, 16...Float, 17...Spring.

Claims (1)

[Scope of Claims] 1. In an air valve that opens and closes a valve body by moving the valve stem up and down by raising and lowering a float placed in a valve box, the float is provided between the locking parts at appropriate positions above and below the valve stem. A float mounting structure for an air valve, characterized in that it is movably installed in the air valve. 2. The air valve float mounting structure according to claim 1, wherein a buffer member is interposed between the float and the upper locking portion.