JP2000320708A - Air valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quick air valve enabling extremely easy design calculation of displacement by adopting a structure requiring no float valve element, with the other basic configuration having many accomplishments in exhaust performance. SOLUTION: This air valve is composed of: a valve casing 1 having an inlet 19 at its lower part, an opening 20 at its upper part and a widened stepped part 23 at the lower part of the opening 20; a lid 7 formed with a large air hole 6 and a small air hole 13, each communicating with the atmosphere, and fixed to the opening 20; a valve element guide 2 having a specific gravity of 1 or less, formed with a small lower hole 3 at its bottom, a window 5 at its side and a flange 36 at its upper part coming into contact with and departing from the stepped part 23, and installed in the valve casing 1 vertically movable so that the top face of the flange 36 can open and close the small air hole 13; and a floating valve element 11 with specific gravity of 1 or less and provided at the valve element guide 2 vertically movable so as to open and close the large air hole 6. When the flange 36 comes into contact with stepped part 23, the small air hole 20 opens.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air valve disposed in a pipe for water supply or the like for rapidly discharging air in the pipe.

[0002]

2. Description of the Related Art Conventionally, as this type of air valve, there is one having a structure disclosed in Japanese Patent Application Laid-Open No. Sho 59-1882. As shown in FIG. 8, a step 23 is formed in the opening 20 in the upper part of the valve box 1.
Is formed. On the other hand, reference numeral 2 denotes a valve guide having an upper opening and a flange 36 at the upper edge. A pilot hole 3 is formed in a bottom portion of the valve body guide 2. A plurality of windows 5 communicating with the passage 4 on the side of the valve body guide 2 are formed around the valve body guide 2. A lid 7 having a large air hole 6 is fixed to an upper portion of the valve box 1.
At this time, the flange 36 is placed on the step 23 and the lid 7 is pressed from above to fix the valve element guide 2.

[0003] In the valve body guide 2, a spherical float valve body 10 and a floating valve body 11 are provided so as to be movable up and down. The specific gravity of the float valve body 10 is 1 or less. The floating valve body 11 is formed with a small air hole valve seat 12 having a small air hole 13 having a small diameter in the center thereof.

[0004] A cover 16 is attached to the upper part of the lid 7.

In such a configuration, the state shown in FIG. 5 is a case where air exists in the pipeline, and the float valve body 10 is located at the bottom of the valve body guide 2 and the floating valve body 11
Is also located below. Therefore, the inside of the pipe and the outside air are connected to the side 4 of the valve body guide, the window 5, the large air hole 6, and the air circulation space 15.
Is communicated through.

When water comes into the pipeline in this state, the internal air is discharged through the side 4 of the valve guide 2, the window 5, the large air hole 6, the air circulation space 15, and enters the valve box 1. Water enters,
The float valve body 10 floats with the floating valve body 11,
The large air hole 6 is closed.

When air in the pipeline accumulates in the valve box 1 from this state, the float valve body 10 loses buoyancy, and the float valve body 10 descends. Thereby, the small air holes 13
Is opened and the air is exhausted.

When the pressure in the pipe becomes negative, the floating valve body 11 and the float valve body 10 descend to open the large and small air holes 6. At this time, water inside the valve body guide 2 is discharged from the pilot hole 3. Thus, these valve bodies can be lowered.

[0009] Fig. 9 shows the structure of Japanese Utility Model Registration No. 061811. The valve box 1 has an opening 20 upward.
A lid 7 formed with a large air hole 6 and a small air hole 13 communicating with the atmosphere and attached to the upper opening 20, and a small pilot hole 3 at the bottom, Air hole 13
A valve body guide having a specific gravity of 1 or less is installed in the valve box 1 so as to open and close, and a specific gravity is provided in the valve body guide 2 so as to be able to open and close the large air hole 6. Consists of one or less floating valve elements 11. Here, several projections 17 are provided on the upper part of the valve body guide 2 so as to bulge radially outward. A pedestal 21 on which the valve element guide 2 is seated is provided below the valve box 1.

In such a configuration, the state shown in FIG. 9 is a case where air exists in the pipeline, and the valve element guide 2 and the floating valve element 11 are located below. Therefore, the inside of the conduit communicates with the outside through the inlet 19, the side 4 of the valve body guide, and the large air hole 6. When the valve box 1 is filled with water, both the valve element guide 2 and the floating valve element 11 float. Thus, the valve element guide 2 closes the small air hole 13, and the floating valve element 11 closes the large air hole 6.

When the pressure in the pipe becomes negative, the floating valve element 11 and the valve element guide 2 descend to open the large and small air holes 6 and 13. At this time, water inside the valve element guide 2 is discharged from the pilot hole 3. Thus, the floating valve element 11 can be lowered.

[0012]

Of the two air valves, the structure shown in FIG. 9 without the float valve 10 is very advantageous from the viewpoint of miniaturization. However, as an air valve for exhausting a large amount of air up to now, an air valve having a structure having a float valve body 10 shown in FIG. 8 has been used. Has,
In particular, data on the relationship between the shape and size of the air passage and the exhaust capacity is uniform. On the other hand, those having the structure without the float valve body 10 have no record of exhausting a large amount, and do not have this data. If there is a demand to design a predetermined displacement as small as possible when designing a new air valve, it is desired to adopt a structure without the flow valve body 10. However, in a structure without a float valve, the absence of past data as described above makes the design calculation difficult.

That is, the air passage is formed at the inlet 19 of the valve box 1.
From the side of the valve guide 2 to the large air hole 6 through the side 4 of the valve guide 2 and the window 5 of the valve guide, much past data is easy to design,
Otherwise, for example, a new design of the passage-shaped air valve passing between the pedestal 21 and the projection 17 is difficult.

In that sense, as shown in FIG.
A flange 36 is provided on the upper part of the valve body guide 2 having a valve body, and the flange 36 is attached so as to hang from the step portion of the upper opening 20 in the valve box 1. The valve body guide 2 is connected to the large air hole 6 through the guide side 4 and the valve body guide window 5 without using the float valve body 10.
It is ideal to construct a structure in which only the floating valve element 11 is stored.

[0015]

SUMMARY OF THE INVENTION A valve box having an inlet at a lower portion, an opening at an upper portion, and a stepped portion expanded below the opening, and a large air hole communicating with the atmosphere. And a lid having a small air hole formed therein and attached to the opening, a small pilot hole at the bottom, a window at the side, and a flange at the top that comes into contact with and separates from the step. A valve body guide having a specific gravity of 1 or less mounted in the valve box so that the upper surface of the flange opens and closes the small air hole, and the valve so as to open and close the large air hole. A floating valve body having a specific gravity of 1 or less is provided on the body guide so as to be movable up and down, and the small air hole is opened when the flange is in contact with the step portion.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIG. First, an internally hollow valve box 1 connected to a pipe (not shown) is provided. An inlet 19 and a mounting flange 18 are formed in a lower portion of the valve box 1, and a step portion 23 that expands outward is formed in an upper opening 20.

At the upper part of the valve box 1 thus formed,
The lid 7 is hermetically attached with the packing 8 interposed. The large air hole 6 is formed in the center of the lid 7, and one small air hole valve seat 12 and a plurality of stoppers 28 are provided on the side of the large air hole 6. A small air hole 13 is formed in the small air hole valve seat 12. The lower surface of the small air hole valve seat 12 protrudes downward by a predetermined dimension from the lower surface of the lid 5.

A floating valve element 11 made of a material having a specific gravity of 1 or less is provided in the valve box 1 so as to be able to move up and down. The valve guide 2 has a small pilot hole 3 in the lower center.
A flange 3 is provided at an upper portion to selectively contact with or separate from the step portion 23 or the small air hole valve seat 12 and the stopper 28.
6 are formed. The floating valve body 11 opens and closes the large air hole 6.

Next, a column 38 is provided on the upper part of the lid 7.
A cover 16 for forming the space 15 is provided.

In such a configuration, FIG. 1 shows a case where air exists in the pipeline, and the valve element guide 2 and the floating valve element 11
Is located at the bottom due to its own weight. Therefore, the internal space of the conduit communicates from the inlet 19 to the outside through the valve element guide side 4, the large air hole 6, and the space 15. When the pipe is filled with water in this state, the valve box 1 is also filled with water, and both the valve element guide 2 and the floating valve element 11 rise by buoyancy.

2, the upper surface of the flange 36 of the valve element guide 2 has a small air hole valve seat 12 and a stopper 28.
To close the small air hole 13, and the floating valve element 11 closes the large air hole 6.

Thereafter, when air accumulates in the valve box 1, FIG.
As described above, only the valve element guide 2 is lowered by its own weight, the small air holes 13 are opened, and the accumulated air is discharged.

When the pressure in the pipe becomes negative, the floating valve body 11 and the valve body guide 2 are both lowered to open the large and small air holes 6 and 12 to the state shown in FIG. At this time, the water inside the valve element guide 2 is drained from the pilot hole 3 to allow the floating valve element 11 to descend.

In this embodiment, the lower surface 4 of the floating valve body 11
The center side of the outer peripheral edge 46 of the “0” is recessed. FIG.
If the air flow does not flow in, the entire surface of the lower surface 40 is in close contact with the bottom surface 42 of the valve body guide 2, and when air flows in, the lower surface 4
The air colliding with zero slightly pushes up the floating valve body 11 to the state shown in the figure. At this time, when the airflow passing from the pilot hole 3 through the tubular annular passage 44 formed by the side surface of the floating valve element 11 and the valve element guide 2 tries to pass through the gap 45 between the lower surface 40 and the bottom surface 42, Since the gap 45 is extremely thin, the flow velocity of the gap 45 is extremely high. Particularly, the flow velocity is always higher on the center side than on the outer peripheral edge 46, so that the static pressure there is extremely low. Is strongly downwardly drawn. This force is also generated when water flows in. Therefore, even though the inside of the valve box 1 is filled with water and the floating force is generated in the floating valve body 11, the floating valve body 11 cannot float due to the suction force.

Therefore, it is necessary to provide the gap 45, and for this reason, the central portion of the lower surface 40 of the floating valve body with respect to the outer peripheral edge portion 46 is recessed.

Instead of recessing the central portion of the lower surface 40 of the floating valve element, the central side is recessed from the point where the bottom surface 42 of the valve element guide 2 contacts the outer peripheral edge 46 of the floating valve element 11 as shown in FIG. We may cut.

FIG. 6 shows another embodiment in which only the outer peripheral edge 46 of the lower surface 40 of the floating valve element 11 is brought into contact with the bottom surface 42 of the valve element guide 2. FIG. FIG. 7 is a diagram in which the bottom surface 42 of the valve element guide is concavely cut in a curved shape.

In short, in order to prevent the entire lower surface 40 of the floating valve body 11 from being in close contact with the bottom surface 42 of the valve body guide 2,
Only the outer peripheral edge portion 46 of the lower surface 40 of the floating valve element 11 is brought into contact with the bottom surface 42 of the valve element guide 2, and a gap 45 is provided on the center side thereof, thereby sucking the floating valve element 11 downward. The generation of force is prevented, and the inconvenience that the floating valve body 11 cannot float due to the above-mentioned suction force is eliminated regardless of whether the floating valve body 11 is filled with water and buoyancy is generated.

However, such a suction force is generated when the water flow passing from the pilot hole 3 to the cylindrical annular passage 44 formed by the side surface of the floating valve body 11 and the valve body guide 2 is extremely high speed. That is, that is, when the pressure at the inlet 19 becomes extremely high.

Therefore, the above-described measures for bringing only the outer peripheral portion 46 of the lower surface 40 of the floating valve body 11 into contact with the bottom surface 42 of the valve body guide 2 are necessary when the pressure at the inlet 19 becomes extremely high. is there.

[0031]

According to the present invention, as described above, the float valve 1 is provided.
0 is not required, so the size can be reduced, and the passage shape follows the large air hole 6 from the inlet 19 through the side 4 of the valve body guide and the window 5 of the valve body guide. There are many, and when a new air valve having a predetermined displacement is designed to be small, design calculation becomes very easy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the embodiment of FIG. 1 during operation.

FIG. 3 is a vertical side view at the time of operation of the embodiment of FIG. 1;

FIG. 4 is a longitudinal side view showing a part of another embodiment of the present invention.

FIG. 5 is a longitudinal side view showing a part of another embodiment of the present invention.

FIG. 6 is a longitudinal side view showing a part of another embodiment of the present invention.

FIG. 7 is a longitudinal side view showing a part of another embodiment of the present invention.

FIG. 8 is a vertical side view showing a conventional air valve.

FIG. 9 is a vertical side view showing a conventional air valve.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 valve box 2 valve guide 3 pilot hole 5 window 6 large air hole 7 lid 11 floating valve 13 small air hole 19 inlet 20 opening 23 stepped portion 36 flange 40 bottom surface of floating valve 42 bottom surface of valve guide 45 Gap 46 Outer edge of lower surface of floating valve element

Claims (2)

[Claims] 1. A valve box having an inlet at a lower portion, an opening at an upper portion, and a stepped portion expanded below the opening, a large air hole and a small air hole communicating with the atmosphere. And a lid attached to the opening, having a small pilot hole at the bottom, having a window at the side, and having a flange at the top that comes into contact with and separates from the step. A valve body guide having a specific gravity of 1 or less is installed in the valve box so that the upper surface of the flange opens and closes the small air hole, and the valve body guide moves up and down to open and close the large air hole. The freely provided specific gravity is 1
An air valve comprising the following floating valve body, wherein the small air hole is opened when the flange is in contact with the stepped portion. 2. The method according to claim 1, wherein one of the bottom surface of the valve element guide and the lower surface of the floating valve element is always recessed so that only the outer peripheral edge of the lower surface of the floating valve element contacts the bottom surface of the valve element guide. 2. The air valve according to claim 1, wherein a gap is provided between a bottom surface of the valve body guide closer to the center than the peripheral edge and a lower surface of the floating valve body.