JP2512613B2 - Air valve float structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float structure of an air valve installed in the middle of piping such as water and sewage.

2. Description of the Related Art Conventionally, an air valve installed in the middle of piping for water supply and sewerage has been shown in FIG. 2, for example. In FIG. 2, fluid flowing through a pipe (not shown) flows into the valve box 1 through an inflow hole 2 formed in the bottom of the valve box 1.
Then, the valve rod 4 is lifted together with the float 3 by the buoyancy received from the fluid, and the valve body 5 provided on the upper end of the valve rod 4 is lifted.
The large air hole 7 formed in the large air valve seat 6 is closed.
The valve rod 4 is supported on the valve body 5 so as to be movable up and down by a predetermined distance, and the upper end of the valve body 5 is held by the diaphragm 8.
The small air holes 9 formed in the valve body 5 are the pressure chambers of the diaphragm 8.
10 and valve box 1 are in communication. Therefore, the small air holes 9 are blocked by the tip of the valve rod 4 when the valve rod 4 is lifted.

Then, when air flows into the valve box 1 from the inflow hole 2, the liquid level inside the valve box 1 drops, the valve rod 4 moves down together with the float 3, and the small air hole 9 of the valve body 5 is opened.
The pressure inside the valve box 1 is transmitted to the pressure chamber 10 of the diaphragm 8 through the small air holes 9. Therefore, the internal pressure of the valve box 1 acts in opposite directions through the small air holes 9 on the valve body 5 which is pressed against the large air hole valve seat 6 by the pressure difference between the internal pressure of the valve box 1 and the atmospheric pressure. The valve body 5 is smoothly pulled down by its own weight and the weight of the valve rod 4 and the float 3, and the air staying inside the valve box 1 is discharged to the outside through the large air hole 7.

However, according to the above-described conventional configuration, the force of the fluid flowing from the inflow hole 2 is strong and the float 3 receives the buoyancy at the time of initial water passage to the pipe and exhaust of the air valve. Before the valve body 5 is closed, the liquid level in the valve box 1 is increased by the large air holes 7
There is a problem that the fluid reaches the outside and the fluid flows out of the valve box 1.

The present invention solves the above problems, and an object of the present invention is to provide a float structure of an air valve capable of promptly closing the valve body when the liquid level in the valve box rises.

Means for Solving the Problems In order to solve the above problems, the present invention provides an air valve that opens and closes a valve body by moving a valve rod up and down by raising and lowering a float arranged in the valve box. The bottom of the float facing the inflow hole is provided with a bowl for receiving the fluid.

Further, the bowl body is formed into an arc surface whose diameter increases toward the inflow hole.

Action With the above-described configuration, the fluid flowing upward from the inflow hole collides with the bowl and is received, and the flow energy of the fluid acts as a biasing force for lifting the float upward. Therefore, the float rapidly rises due to the buoyant force and the urging force received from the fluid, and promptly closes the valve element via the valve rod.

Also, by forming the bowl body into an arc surface that expands in diameter toward the inflow hole, the flow of the fluid that collides with the bowl body is diverted downward along the bowl surface, and the reaction force against the inner surface of the valve box floats. Since it acts as a thrust force that pushes upward, the float rises more quickly and closes the valve element.
Further, the air flowing into the valve box from the inflow hole stays on the inner surface of the bowl body, and the buoyancy of the air acts as a force to push up the float, thereby facilitating the quick closing of the valve body.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. Members that perform the same operations as those shown in FIG. 3 are omitted in the drawing and will be described with the same numbers. In FIG. 1, a valve rod 11 is provided so that a support pin 12 provided on a valve body 5 is engaged with a long hole 13 so as to be able to move up and down a predetermined distance, and a small air hole formed on the valve body 5 at its upper end. 9 is formed so as to be closed. Further, a pair of pins 14 and 15 that form a locking portion are provided at appropriate positions above and below the valve rod 11, and a float 16 that is loosely fitted to the valve rod 11 is disposed on both pins 14 and 15. It is provided so that it can be raised and lowered freely between.

A bowl 18 for receiving the fluid 17 is provided at the bottom of the float 16 facing the inflow hole 2 opened at the bottom of the valve box 1. The bowl 18 has an arc surface that expands in diameter toward the inflow hole 2. Is formed in.

The operation of the above configuration will be described below. The fluid 17 flowing upward from the inflow hole 2 into the valve box 1 collides with the bowl 18 and is received, and the flow energy of the fluid acts as a biasing force for lifting the float 16 upward. Further, since the float 16 is given a buoyancy force by the fluid 17, the float 16 quickly rises due to the buoyancy force and the urging force received from the fluid 17, and pushes up the valve rod 11 via the upper pin 14 to make small air in the valve body 5. As well as closing the hole 9, the valve body 5 is swiftly closed to close the large air hole 7. At this time, since the bowl 18 is an arc surface whose diameter increases toward the inflow hole 2, the flow of the fluid 17 colliding with the bowl 18 is
The float 16 is swung downward along the surface of the valve box 18, and the reaction force against the inner surface of the valve box 1 acts as a thrust force for pushing the float 16 upward.
And the valve body 5 is closed. Furthermore, from the inflow hole 2 to the valve box 1
The air flowing into the stagnation stays on the inner surface of the bowl body 18, and the buoyancy of the air acts as a force to push up the float 16 and promotes the quick closing of the valve body 5.

Then, the liquid level of the valve box 1 in which air flows into the valve box 1 from the inflow hole 2 drops, and it first drops until the float 16 engages with the pin 15 below the valve rod 11, and thereafter the float 16 And the valve rod 11 descend together, and the small air hole 9 is opened. At this time, the pressure inside the valve box 1 is transmitted to the pressure chamber 10 of the diaphragm 8 through the small air hole 9 and is pressed against the large air hole valve seat 6 by the pressure difference between the internal pressure of the valve box 1 and the atmospheric pressure. Body 5
The internal pressure of the valve box 1 acts in opposite directions, and the valve body 5
Is smoothly lowered by its own weight and the weight of the valve rod 11 and the float 16 to open the large air hole 7, and the air accumulated inside the valve box 1 is discharged to the outside through the large air hole 7. Then, as the air is discharged, the fluid flows into the valve box 1 to raise the liquid level, and the valve body 5 is closed again. At this time, when the liquid level rises sharply due to the force of the fluid, or when the liquid surface undulates due to the air bubbles, only the float 16 moves to the valve rod 11
By moving up and down between the upper and lower pins 14 and 15, the turbulence of the liquid level is absorbed and excessive opening and closing of the valve body 5 is prevented. During this time, the valve body 5 and the valve rod 11 are maintained in a closed state in which the large air hole 7 and the small air hole 9 are closed by the pressure difference between the inside and the outside of the valve box 1.

EFFECTS OF THE INVENTION As described above, according to the present invention, the bowl receives the fluid flowing upward from the inflow hole into the valve box, and the flow energy of the fluid is used as the upward biasing force of the float. The float can be quickly raised by the buoyant force and the urging force received from the fluid, and the valve body can be promptly closed via the valve rod.

In addition, by forming the bowl body in an arc surface that expands in diameter toward the inflow hole, the flow of the fluid that collides with the bowl body turns downward along the bowl surface, and the reaction force is used as thrust of the float upwards. The valve body can be actuated, the valve body can be closed more promptly, and the buoyancy of the air staying on the inner surface of the bowl body can promote the rapid closing movement of the valve body.

[Brief description of drawings]

FIG. 1 is an overall sectional view showing a float structure in one embodiment of the present invention, and FIG. 2 is an overall configuration diagram showing a conventional air valve. 11 …… valve rod, 14,15 …… pin, 16 …… float, 17 ……
Fluid, 18 ... bowl.

Claims (2)

(57) [Claims] 1. An air valve that opens and closes a valve body by moving a valve rod up and down by raising and lowering a float arranged in a valve box, wherein a fluid is applied to the bottom of the float facing the inflow hole opened in the bottom of the valve box. The float structure of the air valve is characterized by having a bowl that receives it. 2. The float structure for an air valve according to claim 1, wherein the bowl is formed in an arcuate surface whose diameter increases toward the inflow hole.