JP2566649B2 - Air valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve that is installed upright in a pipeline or the like and exhausts air in the pipeline or the like to the atmosphere.

2. Description of the Related Art Conventionally, in this type of air valve, a float is vertically movable inside a valve box that has an exhaust hole at the top and a fluid inflow hole at the center of the bottom. There was an idle valve attached.
The exhaust hole and the floating valve were provided at positions eccentric to the center of the float.

This air valve, when the fluid in the pipeline is not flowing into the valve box, floats down and sits on the upper surface of the bottom of the valve box, the floating valve opens the exhaust hole, and the air in the pipeline flows in. A large amount of air is exhausted from the exhaust hole to the atmosphere via the hole and the air inflow hole. Then, when the fluid in the pipeline flows into the valve box from the fluid inflow hole, the float floats and the floating valve closes the exhaust hole,
Prevents the fluid in the valve box from overflowing into the atmosphere. At this time, the inside of the valve box is pressurized by the fluid in the pipeline.
Therefore, next time when the water level in the valve box drops,
The float descends due to its own weight, but the floating valve remains pressed against the exhaust hole due to the internal pressure and does not descend. But,
A small air hole is provided vertically through the floating valve, and opens when the float separates from the floating valve. Therefore, a small amount of residual air is exhausted from the small air hole to the atmosphere via the exhaust hole. When the water level of the fluid in the valve box rises accordingly, the float rises to close the small air holes of the floating valve, preventing the fluid in the valve box from overflowing into the atmosphere.
In this way, when the fluid is sent into the pipeline, a large amount of air in the pipeline is exhausted, and by opening and closing the small air holes according to the water level of the fluid in the valve box, the air in the pipeline is removed. Exhaust a small amount.

However, in the above-described conventional device, a certain amount of clearance is provided between the float and the valve box so that the float can be smoothly moved up and down without being twisted. Therefore, the floating valve provided on the upper surface of the float at a position eccentric to the float may be misaligned. As a result, there is a problem in that the misalignment occurs between the floating valve and the exhaust hole to create a gap, and the exhaust valve is not sufficiently blocked by the floating valve, resulting in a problem that water cannot be stopped properly. .

An object of the present invention is to improve such a conventional air valve to eliminate such a problem.

Means for Solving the Problems In order to achieve the above object, the air valve of the present invention is provided with a float capable of ascending and descending in a valve box having an exhaust hole at the top and a fluid inflow hole at the bottom. In an air valve provided with a floating valve for opening and closing the exhaust hole by raising and lowering the float, the upper surface of the floating valve enters into the exhaust hole as the floating valve rises, and the position of the floating valve is displaced with respect to the exhaust hole. A guide protrusion for preventing and centering is provided, and the guide protrusion is formed in a tapered shape that narrows upward by a cylindrical pillar and a plurality of ribs radially arranged on the side surface of the pillar. is there.

Operation In the above-described configuration of the present invention, when the floating valve is lifted by floatation of the float and approaches the exhaust hole, the tip of the guide protrusion enters the exhaust hole to prevent the displacement of the floating valve from the exhaust hole. As the approach further proceeds, the tapered portion of the guide protrusion comes to be guided along the inner surface of the exhaust hole to center the floating valve. Lastly, the floating valve closes the exhaust hole at the normal position to reliably prevent the fluid in the valve box from leaking into the atmosphere from the exhaust hole. At this time, a plurality of ribs radially arranged on the side surface of the cylindrical support column exist in parallel with the flow of the fluid and act as stabilizing vanes to prevent the displacement of the floating valve and centering more effectively. At the same time, it acts as a reinforcing member that supports the water pressure applied to the valve body when the floating valve is closed, and the upper portion of the floating valve is made to have a sturdy yet lightweight structure to stabilize the attitude of the floating valve during floating.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 1, the air valve of the present embodiment is provided with a float 22 capable of moving up and down in a valve box 21, a floating valve 23 attached to the upper surface of the float 22, a ball valve 24 and a mounting flange. It is erected on a pipeline (not shown) via 25. The valve box 21 is formed by connecting an upper valve box 26 and a lower valve box 27 with a plurality of bolts 28 and nuts 29. An exhaust hole 30 that communicates the inside of the valve box 21 with the atmosphere is provided at the top of the upper valve box 26 in the vertical direction, and a fluid inlet hole 31 that communicates with the ball valve 24 is provided in the bottom center of the lower valve box 27. Is provided. A rubber exhaust valve seat 32 is fitted in the lower opening of the exhaust hole 30. The float 22 is disc-shaped and made of a material such as foamed rubber having a specific gravity of less than 1, and has a floating valve mounting recess on the upper surface.
33 is formed, and the air inflow hole 34 penetrates the central portion in the vertical direction. A guide groove 35 for preventing rotation of the float 22 is formed on the side surface of the float 22 in the vertical direction, and
It engages with a guide protrusion 36 formed on the inner surface thereof so as to be able to move up and down.

As shown in FIGS. 2 and 3, the floating valve 23 is a plate valve for opening and closing the lower opening of the exhaust hole 30 by moving the float 22 up and down. A small air hole valve seat 38 made of steel is fitted in the small air hole 39, and a small air hole 39 penetrates through the central portion of the valve seat 38. The floating valve body 37 has an annular guide protrusion 40 on the upper surface and a pair of pin portions 41 on the side surfaces. The guide protrusion 40 is
A taper portion having an outer diameter smaller than the inner diameter of the exhaust hole 30 and having a plurality of triangular ribs (four in the figure) on the side surface.
42 is formed. 44 is a retainer for restricting the vertical movement of the pin portion 41 in order to prevent the floating valve body 37 from coming out of the convex portion 33, and is attached to the float 22 by the set screw 45.

In FIG. 1, 46 is a cylindrical strainer for filtering the fluid flowing into the valve box 21, and its upper end is fixed to a lid 47 provided at the center of the top of the upper valve box 26 via a pin 48. At the same time, the lower end portion penetrates the air inflow hole 34 of the float 22 and is inserted into the fluid inflow hole 31 of the lower valve box 27. Lid 47
A cock 49 is provided on the upper surface of the. The ball valve 24 is normally open, and is closed for maintenance, inspection, replacement, etc. of the air valve.

 Next, the operation of the above configuration will be described.

When the fluid in the pipeline does not flow into the valve box 21, the float 22 descends and rests on the upper surface of the bottom of the lower valve box 27, and the floating valve
23 opens the exhaust hole 30, and exhausts a large amount of air in the pipeline from the exhaust hole 30 to the atmosphere via the ball valve 24, the fluid inflow hole 31 and the air inflow hole 34. And the fluid in the conduit is the ball valve
When it flows into the valve box 21 from the fluid inflow hole 31 via 24,
The float 22 floats and lifts the floating valve 23. Idle valve 23
When the valve approaches the exhaust hole 30, the tip of the guide projection 40 enters the exhaust hole 30 and prevents the floating valve 23 from being displaced from the exhaust hole 30. When the float 22 further floats and the guide protrusion 40 enters the exhaust hole 30, the tapered portion 42 of the guide protrusion 40 is guided along the inner surface of the exhaust hole 30, and the guide hole 40 is guided to the exhaust hole 30. Center the idle valve 23. Therefore, the floating valve body 37 is pressed against the exhaust hole valve seat 32 at the normal position by the float 22, and both the exhaust hole 30 and the small air hole 39 are closed. This prevents the fluid in the valve box 21 from overflowing into the atmosphere.

At this time, internal pressure is generated in the valve box 21 by the fluid pressure in the pipe. Therefore, when the water level of the fluid in the valve box 21 decreases next time, the float 22 descends due to its own weight,
The floating valve body 37 remains pressed against the exhaust hole valve seat 32 by the internal pressure and does not descend. Therefore, the float 22 is a floating valve.
The small air hole 39 is opened away from the small air hole valve seat 38 of 23. As a result, a small amount of residual air in the valve box 21 is exhausted from the small air hole 39 to the atmosphere via the exhaust hole 30. Along with this valve box 21
When the water level of the fluid inside rises, the float 22 rises and closes the small air holes 39, preventing the fluid inside the valve box 21 from overflowing into the atmosphere. In this way, when the fluid is fed into the pipeline, a large amount of air in the pipeline is exhausted, or after the fluid is once filled in the pipeline, the volume is reduced depending on the water level of the fluid in the valve box 21. By opening and closing the air hole 39, a small amount of air in the pipeline is exhausted.

In the above exhaust action, when the floating valve 23 is lifted by the float of the float 22 to close the exhaust hole 30, the guide protrusion 40
Since the tapered portion 42 and the tapered portion 42 prevent the floating valve element 37 from being displaced and centered with respect to the exhaust hole 30, the floating valve 23 closes the exhaust hole 30 at the normal position, and the fluid in the valve box 21 from the exhaust hole valve seat 32 is closed. Is unlikely to leak into the atmosphere.

As described above, according to the present invention, the guide projection having the tapered portion on the side surface is provided on the upper surface of the floating valve. Therefore, the guide projection enters the exhaust hole as the floating valve rises. However, the displacement of the floating valve with respect to the exhaust hole is prevented and centering is performed. Therefore, the floating valve can be guided to the normal position with respect to the exhaust hole without excessively restraining the lifting and lowering of the float, and the fluid in the valve box is reliably prevented from leaking into the atmosphere from the exhaust hole. can do.

[Brief description of drawings]

FIG. 1 is a sectional view of an air valve showing an embodiment of the present invention, and FIG.
The drawing is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a plan view of the idle valve in FIG. 21 ... Valve box, 22 ... Float, 23 ... Floating valve, 30 ... Exhaust hole, 31 ... Fluid inlet hole, 40 ... Guide protrusion, 42 ... Tapered part.

Claims (1)

(57) [Claims] 1. A float is vertically movable in a valve box having an exhaust hole at the top and a fluid inflow hole at the bottom, and a floating valve is provided on the float to open and close the exhaust hole by raising and lowering the float. In the air valve, a guide protrusion is provided on the upper surface of the floating valve, the guide protrusion entering the exhaust hole as the floating valve rises, and prevents misalignment of the floating valve with respect to the exhaust hole and centering. An air valve, which is formed in a tapered shape that narrows upward by a columnar column and a plurality of ribs radially arranged on a side surface of the column.