JPH057588B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an air valve that is installed in the middle of a water supply pipe and used to discharge air from within the pipe.

(Prior Art) Generally, as air valves for water supply, those established in JIS B2063 are manufactured, sold, and well known. In this known air valve, a float valve made of a ball is housed in a valve box, and a valve seat with an exhaust port that comes into contact with the ball when it floats is provided directly above.
The performance of air valves with such a configuration is as follows for single-port nominal diameters of 13, 20, and 25.
It must operate within an internal pressure range of 0 to 7.5 Kgf/cm ² . (However, the pressure resistance is 17.5Kg.
f/cm ² ).

Under these conditions, when determining the size of the float valve in the air valve, the exhaust port should be 2m/
m and the internal pressure is 7.5Kgf/cm ² , the force P pushing up the float is P=π×0.2cm/4×7.5Kgf/cm ² =0.2355Kg. In other words, the float is pushed upwards by a force of 235.5g. Therefore, if the float does not have a size and weight of 235.5g+α, it will not be able to overcome the pushing up force and fall naturally, and exhaustion will not be possible. Therefore, the float is 235.5
Since the weight must be g + α and it must float on water, its specific gravity must be around 0.75 to 0.8.
From this, the diameter of the spherical float is approximately 85m/m.
It becomes the size of . Therefore, when determining the size of the valve box etc. that accommodates this, the overall size specified in JIS B2063 will be determined.

Due to the above-mentioned considerations, this known pneumatic valve has disadvantages in that its size is unnecessarily large, which not only limits the installation location but also increases the cost due to the large amount of materials used.

In order to eliminate such drawbacks, the earlier patent application No. 1983-65315 (Japanese Patent Application Laid-Open No. 1983-1983) filed by the same applicant has been proposed.
No. 1433). The invention of this earlier application uses an inverted trapezoidal cross section as a float valve, and has a structure in which the valve seat that floats and comes into contact is located at a position that is shifted toward the side of the upper part, so that the water level inside the valve box is lowered. When the float valve is in contact with the valve seat, the end of the float valve that is not in contact with the valve seat falls downward and becomes inclined, allowing the valve seat's exhaust port to open easily and temporarily reducing the internal pressure of the valve body. Even if the weight is 235.5 g, the pushing up force is applied toward the end that contacts the valve seat of the float valve, and since the other end easily descends by applying a screw, the pushing up force is Since the weight of the float valve, which is about 1/4 of the weight, is sufficiently lowered, the valve seat can be opened easily and reliably, so that the air valve itself can be made smaller and more compact.

However, even in the invention of this prior application, since the valve seat that the float valve comes into contact with is provided at the top, there is still an upward pushing force applied, even if it is about 1/4 of the force. It is absolutely necessary for a float valve to have enough weight to overcome it, and its size is inevitably limited, making it impossible to make it extremely compact.

(Objective of the Invention) The object of the present invention is to provide an air valve for water supply, which is capable of opening and closing the valve without being significantly affected by the pushing up force within the valve box, and which allows the float valve to be made smaller and the whole to be significantly smaller and more compact. This is what we are trying to provide.

(Structure of the invention) The present invention has been made to achieve the above object,
A valve box, a lid material that is placed on the top surface of the valve box, a valve seat that has an exhaust port that is attached to a side surface of the lid material so as to protrude laterally and inwardly, and an air outlet that is attached to the inside of the valve seat. It consists of an adjustment screw that adjusts the protrusion length and has a communication hole that communicates with the exhaust port, and a float valve that is approximately in the shape of an inverted truncated cone that opens and closes the valve seat. A notch is formed, and bearing holes are provided in the rising walls on both sides of the notch from the sides toward the notch, so that the concave notch comes into contact with the tip of the valve seat protruding inside the lid member. and a support shaft attached to the lid member is fitted into the bearing hole from both sides, so that the float valve swings vertically about the support shaft to open and close the exhaust port. The valve seat is installed laterally, so it is not affected greatly by the upward force caused by the internal pressure of the float valve, and is only affected by buoyancy. Since the valve seat can be opened and closed, the float valve itself can be made significantly smaller.
Moreover, the float valve has a concave notch formed on one side, and is arranged so that the notch comes into contact with the tip of the valve seat that is attached to the lid and protrudes inside.
The entire air valve can be made smaller and more compact.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment. Reference numeral 1 denotes a valve box, and the lower part of the valve box is provided with a mounting part 2 for connecting to the main body of the valve, and is connected to the mounting part. An inlet 3 is provided. A lid member 4 is removably screwed onto the upper part of the valve box via a gasket 1a.

This lid material 4 is formed to have a high arch, and a cylindrical portion 5 is integrally formed on one side of the lid material, and the cylindrical portion communicates with the inside and has an outlet on the lower surface of the cylindrical portion. 6
is provided. An adjusting screw 7 is screwed and inserted into this cylindrical portion so as to be able to move forward and backward, and a communication hole 8 having a T-shaped cross section is provided in the inside of the adjusting screw 7 so as to connect the tip to the outlet 6. A valve seat 9 made of an elastic material such as rubber is attached to the tip of this adjustment screw (inner side where it is inserted) with a cap nut-shaped mounting member 10, and the center portion of the valve seat is connected to the communication hole 8. A communicating exhaust port 11 is formed therethrough.

A float valve 12 is further disposed inside the lid member 4. As shown in FIG. 2, this float valve has an approximately inverted truncated cone shape as a whole, and has a concave notch 13 formed on one side, and side walls 14 and 15 on both sides of the notch. Bearing holes 16 and 17 are provided from the top toward the notch 13.

When installing the float valve 12 having such a configuration, as shown in FIG. Support shafts 18, 19 from both sides of
is inserted, and its tips are loosely fitted into the bearing holes 16 and 17, respectively. Therefore, float valve 1
2 is mounted rotatably in the vertical direction by support shafts 18 and 19.

The support shafts 18 and 19 have O-rings 22 and
23, and supports the float valve 12 from both sides. Note that the reference numeral 24 in the figure is an O-ring interposed between the adjusting screw and the cylindrical portion.

(Function) The air valve for water supply of the present invention having the above-mentioned configuration is used by being attached to the main body attached to the water pipe in the same way as a normal air valve, and the water in the water pipe flows from the inlet 3 to the valve box. 1, float valve 1
2 floats up, and the notch 13 of the float valve 12 comes into contact with the valve seat 9 to prevent water from flowing out (see FIG. 1). When the air in the water pipe is introduced into the valve box 1 through the inlet 3 in this state, the water level inside the valve box 1 decreases, and the float valve 12 moves along the support shaft 1.
8 and 19, and the end opposite to the notch 13 is lowered. As a result, the exhaust port 11 of the valve seat 9, which had been blocked by the notch 13, opens, and the internal air is discharged from the exhaust port to the outside through the communication hole 8 and the outlet 6. In this case, even if the internal pressure inside the valve box 1 is relatively high, since the exhaust port 11 is in the horizontal direction, there is almost no pushing up of the float valve 12, and even if the float valve 12 does not have much weight, the support shaft 18 , 19 as the axis, and the valve seat 9
Open the exhaust port 11 of. When the water level rises as the air in the valve box is exhausted, the float valve 12 floats up and comes into contact with the valve seat again through the notch 13, thereby blocking the exhaust port 11. The contact pressure between the valve seat 9 and the notch 13 of the float valve 12 is determined by adjusting the adjustment screw 7.
This is done by tightening or loosening.

(Effects of the Invention) As explained above, according to the present invention, the float valve can be formed small, so the air valve can be made smaller and more compact, and the valve seat is attached to the tip of the adjustment screw, so that the inward protrusion length can be increased. Since the height can be adjusted, it is possible to finely adjust the contact state between the exhaust port of the valve seat and the flat surface of the concave notch of the float valve.Moreover, since it is close to the support shaft of the float valve, there is little misalignment between the valve seat and the float valve. This provides excellent effects such as ensuring proper abutment to prevent water leakage and efficiently exhausting air accumulated in the valve box.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an air valve for water supply according to the present invention, Fig. 2 is a perspective view of a float valve attached to the air valve, Fig. 3 is a cross-sectional view of a main part of the air valve, and Fig. 4 1 is a sectional view similar to FIG. 1 showing the operation of a float valve in the same air valve. 1...Valve box, 2...Mounting part, 3...Inflow port, 4
... Lid material, 5 ... Cylindrical part, 6 ... Outlet, 7 ...
Adjustment screw, 8...Communication hole, 9...Valve seat, 10...
Mounting member, 11...Exhaust port, 12...Float valve, 13...Notch, 14, 15...Rising wall,
16, 17... Bearing hole, 18, 19... Support shaft,
20, 21... Cylindrical part, 22, 23, 24... O
ring.

Claims (1)

[Claims] 1. A valve box, a lid material that is placed on the top surface of the valve box,
A valve seat having an exhaust port attached to a side surface of the lid member so as to protrude laterally and inwardly, and a communication hole for adjusting the length of the valve seat's inward protrusion and communicating with the exhaust port. It consists of an adjustment screw and a generally inverted truncated conical float valve that opens and closes the valve seat,
A concave notch is formed on one side of the float valve, bearing holes are provided in the rising walls on both sides of the notch from each side toward the notch, and the concave notch protrudes inside the lid. A support shaft attached to the lid member is fitted into the bearing hole from both sides, and the float valve swings vertically about the support shaft. An air valve for water supply, characterized in that the air valve is formed so that the exhaust port can be opened and closed.