JPS59113383A - Quick suction air valve with exhaust quantity control valve - Google Patents

Abstract

PURPOSE:To prevent water-hammering, by providing an exhaust quantity control valve which faces the large air hole of the lid of an air valve and substantially hinders only much exhaust. CONSTITUTION:An exhaust quantity control valve 7, which substantially hinders only much exhaust, is provided in the face of a large air hole 4A which is provided in the lid 4 of an air valve to perform much suction and exhaust. When water is caused to flow through a pipe, a float valve 2 in a valve casing 1 gravitates so that the large-diameter air hole 4A of the lid 4 is opened. At that time, the exhaust quantity control valve 7 facing the air hole 4A restricts the quantity of exhaust and allows only a small quantity of exhaust so that the water gradually flows into the valve casing 1 when the water is introduced into it. For that reason, a harmful water hammer does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve that is installed in the middle of a fluid pipeline such as a water main pipe and used to remove air mixed in the pipeline;
That is, the present invention relates to air valves, and more specifically, to improvements in the exhaust function of so-called rapid air valves having large-diameter vents for intake and exhaust of large quantities.

In the work of passing water through or discharging water from a pipe, a normal air valve (for example, a JIS-2063 water supply air valve) has a slow intake/exhaust function, resulting in poor work efficiency. For this reason, so-called rapid air valves have been developed that allow large amounts of air to flow in and out during pipe water flow and drainage work, and which perform the same exhaust function as ordinary air valves when the pipes are full of water. There is.

FIG. 1 shows an example of such a pneumatic valve. Here, 1 is a valve box, 2 is a float valve, 3 is a float valve guide, 4 is an upper cover, and 6 is a cover, and its characteristic structure is that the upper cover 4 has a large diameter vent 4A (hereinafter referred to as a large air hole). ), and a floating valve 5 is disposed above the float valve 2, and the floating valve 5 contacts the valve seat on the lower surface of the large air hole 4 when the inside of the valve box 1 is filled with water, and separates from it otherwise. That's true. With this configuration, during water passage and drainage work in the pipeline, the floating valve 5 and the float valve 2 move downward due to their own weight, and the floating valve 5 opens the large air hole 4A, allowing a large amount of air to flow in and out. (state shown in Figure 2). In addition, when the pipe line is full of water, the inside of the valve box 1 of the air valve is also filled with water, and the float valve 2 and floating valve 5 rise upward due to buoyancy, and the floating valve 5 closes the large air hole 4A. (Situation shown in Figure 1). In this state, when air bubbles in the pipe are introduced into the valve box 1, only the float valve 2 is slightly lowered, and the air bubbles are removed from the small diameter central opening of the conical valve seat 51 held at the center of the floating valve 5. It will be released to the outside air through the air valve, and will function in the same way as a normal air valve.

However, the rapid air valve has the following drawbacks.

In other words, when water is passed through a pipe, immediately before the end of rapid evacuation from the air valve, the outflowing fluid is caused by the gas changing from gas to liquid. The water hammer effect caused by the sudden valve occlusion is much greater than that of a normal air valve, and as a result, it causes damage to the components inside the air valve.

Therefore, the present invention 1-+ provides an improved air valve that prevents the harmful water hammer effect caused during pipe water passage work in a rapid air valve, but does not impair other functions of the rapid air valve. is the technical issue.

In order to achieve the above-mentioned technical problem, the air valve of the present invention has an exhaust volume adjustment valve that faces a large air hole for large volume intake and exhaust formed in the upper cover of the air valve and that substantially suppresses only large volume exhaust. The system adopts an established configuration (technical means).

Here, "substantially suppressing only large-volume exhaust" means that the water hammer effect is suppressed to the extent that the rapid air valve does not reduce the large-volume intake capacity when the pipe is drained and the small-volume exhaust capacity when the pipe is full of water. This means suppressing the exhaust capacity to a sufficient extent to prevent the Further, the present displacement adjustment valve is not limited to individual specific embodiments, but includes all adjustment valves that perform an upward slope function.

With this configuration, the air valve of the present invention exhibits the following effects. In other words, when water is flowing through a pipe, the float valve or floating valve inside the valve box moves downward under its own weight and opens the large diameter vent in the top cover, but the exhaust volume regulator installed facing the vent opens The valve functions to restrict the exhaust volume and only allow a small amount of exhaust, so when flowing water is introduced into the valve box, the flowing water gradually flows into the valve box, and no harmful water hammer phenomenon occurs.

The present invention has the following unique effects.

(2) By using a ready-made rapid air valve as is, harmful water hammer effect during exhaust can be prevented without changing the performance of the rapid air valve other than large volume exhaust.

■ Since the action of sudden force from below the air valve chamber can be removed, there is no damage caused by accidental movement of the float valve, etc., and this makes it possible to reduce the cost of internal parts of the valve box, such as float valves, floating valves, and float valve guides. It can be designed to

Hereinafter, embodiments of the present invention will be described based on the drawings from FIG. 3 onwards.

Figures 3 to 6 show an embodiment of the air valve of the present invention, in which Figure 3 shows when the pipe is full of water (that is, when exhausting water under pressure), Figure 5 shows it during drainage work, and Figure 6 shows it when the pipe is open. The operating status of each air valve during water work is shown.

In these figures, the same reference numerals are given to the same parts as those in FIGS. 1 and 2. That is, 1 is a valve box, 2 is a float valve, 3 is a float valve guide, 4 is an upper cover,
5 is an idler valve, and 6 is a cover. Others, 11 is valve box 1
12 is the flange of the valve box. , 31 is a required number of upper ventilation holes drilled in the upper part of the float valve guide 3, and 32 is a lower hole (this hole) for preventing negative pressure generated on the lower surface of the float valve 2, which is bored in a required number in the lower part of the float valve guide. ), 41 is a valve seat member for a large air hole which is screwed and fixed to the large diameter female screw hole 42 of the upper cover 4 and has a large air hole 4A inside, and 411 is a valve seat member 41 for the large air hole. A guide member 8 is a fixture for fixing the valve box 1, the upper lid 4, and the cover 6, and 9 is a cock.

A displacement regulating valve 7 is installed between the upper lid 4 and the cover 6 facing the large air hole 4A of the upper lid 4. The regulating valve 7 is an outer cylinder 7
1 and a floating valve 72 housed in the outer cylinder so as to be vertically movable. The outer cylinder 71 has a flange 711 at the top, forming a large-diameter ventilation lower 1A, and has a spacer 712 on the outer periphery.

The outer cylinder 71 is fixed in a predetermined position and airtight (excluding the ventilation lower 1A) by the pressing action of the cover 6 via the spacer 712.

Is the floating valve 72 located above and below the center of the disc-shaped main body? A small diameter ventilation lower 2A is drilled through this, and a number of legs 72 are provided on the outer periphery.
1 is attached and the outer diameter of the leg 721 is the same as that of the outer cylinder 7.
The inner diameter is made slightly smaller than the inner diameter of 1.

Therefore, when the floating valve 72 receives its own weight or an applied force from above, the legs 721 are seated on the upper lid 4, and ventilation is performed through between the large diameter ventilation lower 1A of the outer cylinder 71 and the legs 721 of the floating valve 72. . Furthermore, when the floating valve 72 receives a force from below that overcomes its own weight, the upper surface of the main body of the floating valve 72 comes into contact with the lower surface of the collar 711 of the outer cylinder 71 (i.e., the valve seat of the large-diameter ventilation lower 1A). Ventilation is through the small diameter ventilation lower 2A of the floating valve 72.
It is done only by

Note that the spacer 712 attached to the outer circumference of the outer cylinder 71 may be formed on the inner circumference of the cover 6.

FIG. 7 shows another displacement regulating valve 7'. The regulating valve γ is a dome body 7 mounted facing the large air hole 4A of the upper cover 4.
3, and the dome body 73 has a required number of ventilation lowers 3A.
is drilled. The ventilation lower 3A has a relatively small diameter, but as a whole, a check valve is provided for the other ventilation lowers 3A, leaving some ventilation holes on the surface that suppresses the amount of ventilation through the large air holes 4A during intake. 74 is attached.

With this structure, the air valve to which the displacement adjustment valve γ is attached opens the entire ventilation lower 3A during intake to perform a large amount of ventilation, and during exhaust, a small amount of the ventilation lower 3A opens.
Since all but A are blocked, a small amount of exhaust is performed, and a large amount of exhaust is suppressed.

FIG. 8 shows still another displacement regulating valve γ. The regulating valve γ is composed of a truncated conical cylinder 75 mounted facing the large air hole 4A of the upper cover 4, and the cylinder 75 has a required number of ventilation lowers 5.
A is drilled. An inner cylinder 76 is suspended inside the cylinder 75 via a pin 77 so as to be vertically movable.

With this structure, the air valve equipped with the displacement adjustment valve γ sucks in a large amount of air from all the ventilation lowers 5A at the time of intake, passes through the gap 78 between the cylinder body 75 and the inner cylinder 76, and passes through the air hole 4A. Inhalation takes place through. During exhaust, the inner cylinder 76 is lifted upward by the internal pressure of the air valve box and comes into contact with the inner surface of the cylinder body 75, thereby closing the gap 78.
is closed, and exhaust is performed only from some of the vents (for example, the lower part of the cylindrical body 75), thereby suppressing a large amount of exhaust.

The present bowl is not limited to the configuration of the slanted embodiment, and various design changes can be made within the scope of the basic technical idea of the present invention.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the structure of a conventional rapid intake/exhaust air valve, Fig. 2 is a diagram of its operation during large intake/exhaust, and Figs. 3 to 6 are one embodiment of the air valve of the present invention. For example, Fig. 3 is a vertical cross-sectional view showing its normal operating state, Fig. 4 is a detailed cross-sectional view of the displacement adjustment valve, and Fig. 5 is a longitudinal cross-sectional view showing its operating state during pipe water flow and exhaust. 6 are longitudinal cross-sectional views showing the operating state during pipe drainage intake, and FIGS. 7 and 8 are views showing other embodiments of the displacement control valve. 1... Valve box 2... Float valve 3.
...Float valve guide 4 ...Top lid 4A
...Vent 5...Idle valve 6...
...Cover 7. γ, 1... Displacement adjustment valve
71...Outer cylinder 71A...Vent hole 7
2...Floating valve 72A...Vent Patent applicant Kuman Kogyo Co., Ltd. Patent attorney Hitoshi Ikeda Figure 5 /-9 1

Claims (1)

[Claims] 1. A large air hole (
4A), characterized in that a displacement adjustment valve (7) is installed facing the large air hole (4A) and substantially suppresses only large volume exhaust.