JPH01299375A - Air valve - Google Patents

Abstract

PURPOSE:To prevent improper operations due to foreign matter contained in fluid with ease as well as to enable a float to be made small in size and light in weight by letting plural numbers of exhaust ports tilted against the vertical direction be distributed in the circumferential direction of a valve box so as to be arranged, and thereby providing a valve body which opens/closes the exhaust ports simultaneously. CONSTITUTION:Two valve body sections 4a and 4a which open/close two exhaust ports 5 and 5 independently are connected with each other by a rot 4b so that one valve body 4 is formed. A fluid inlet port 8 which enables fluid to flow into and flow out of a valve box 1 is formed at the lower end of a valve box main body 1a so that a float 2 pushes the valve body 4 up with the elevation of a fluid level in the valve box so as to let an exhaust port 5 be closed, and the valve body 4 is lowered down by its own dead weight so as to let the exhaust port 5 be opened. The exhaust port 5 can therefore be made large in area, it is possible that the port is hardly clogged with foreign matter so as to hardly cause faulty operations. In addition, by this constitution, the float can be made small in size and light in weight so that the whole assembly can be made compact in size.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to pneumatic valves.

[Conventional technology]

Conventionally, in air valves, as shown in Fig. 4, a valve box (1
) is formed with a vent hole (12) having a smaller diameter than the exhaust port (5) in the floating valve body (4) that opens and closes the exhaust port (5);
By configuring the vent hole (12) to open and close as the float (12) moves up and down, even when there is pressure inside the pipe, when air mixed in the pipe line accumulates inside the air valve, It was supposed to be discharged.

In other words, when the pressure inside the valve box becomes higher than the pressure outside the valve box when the exhaust port (5) is closed, the floating valve body (4)
) is pressed against the exhaust port valve seat.

This phenomenon also occurs between the vent hole (12), which corresponds to the exhaust port, and the float (2), which corresponds to the floating valve body. It is determined by the product of pressure and exhaust port area, that is, the diameter of the vent hole (12) is smaller than the diameter of the exhaust port (5), and the pressing force on the float side is smaller than the pressing force on the floating valve body side. Due to this, even if the differential pressure is relatively large, when the valve box liquid level falls, the float (2) will quickly follow this and fall under its own weight, opening the vent hole (12) and opening the pipe. Even if pressure is applied in the passage and the valve body (4) is closed, air can be removed from the vent hole (12).

[Problem to be solved by the invention]

In the case of conventional valves, especially when degassing a sewage pipe or the like, foreign matter mixed in the fluid tends to adhere to or clog the vent hole, resulting in malfunction.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air valve that can perform exhaust under pressure while easily avoiding malfunctions caused by foreign matter in the liquid, while also making it possible to reduce the weight and size of the float.

[Means to solve the problem]

The air valve according to the present invention is characterized in that a plurality of exhaust ports inclined with respect to the vertical direction are distributed in the circumferential direction of the valve box and formed on the inner surface of the valve box, and the exhaust ports are simultaneously opened and closed. The reason is that a valve body is provided to The functions and effects thereof are as follows.

[For production]

A plurality of exhaust ports formed to have the same area when facing sideways or tilted are distributed at equal intervals, or a pair of exhaust ports where two exhaust ports having the same area are parallel in the radial direction of the valve body when facing sideways or tilted. By adopting an exhaust port configuration such as arranging multiple pairs of exhaust ports, all or part of the operating force that presses the valve body against each exhaust port cancels out, and the valve body is not actually pressed against the exhaust port. In other words, the force with which the valve body is pressed against the exhaust port is made small in relation to the differential pressure value, so that even if there is the above-mentioned differential pressure between the inside and outside of the valve box, when the liquid level inside the valve box falls, it will quickly follow this pressure. Even if the area of the exhaust port is increased compared to the conventional method, the opening operation force of the valve body due to the weight of the valve and the weight of the float can be reduced. You can even make it small.

〔Effect of the invention〕

Due to the above-mentioned exhaust port configuration, while it is possible to exhaust air under pressure, the area of the exhaust port at that time is large, and even if there are foreign objects in the liquid, the foreign objects are less likely to clog and malfunctions are less likely to occur. In addition, it has become possible to make the float lighter and smaller, making it possible to make the entire air valve more compact.

〔Example〕

Next, examples will be shown.

As shown in Figure 1, the valve body (1a) and the upper valve body part (lb) connected by bolts to the upper end of this valve body (1a)
A float (2) is connected to a valve body (1) consisting of a valve body (4) connected to a float (2) by a rod (3).
) to form an air valve for sewer pipes.

That is, as shown in Fig. 3, there are two
Two cylindrical bodies each having two sideways exhaust ports (5), (5) formed therein, and an exhaust path (6) communicating with the exhaust ports (5) passing through the valve box (1). (7),
(7) is attached to the upper valve box portion (lb).

Then, the rod (4
b) to form one valve body (4).

A fluid inlet (8) that allows fluid to flow in and out of the valve box (1) is formed at the lower end of the valve box main body (la), and as the liquid level within the valve box rises, a float (2)
The valve body (4) is pushed up and closed against the exhaust port (5), and as the liquid level in the valve box decreases, the float (2) pushes the valve body (4) due to its own weight and the weight of the valve body. It is designed to be lowered to open the exhaust port (5).

More specifically, even if fluid flows into the valve box (1), if the liquid level in the valve box is below the set level, the valve body (4) will catch it with the dust remover (9) as shown in Figure 2. two exhaust ports (5) in the lowered fully open position or in the lowered open position supported via the rod (3) by the float (2);
, (5) are opened, and the two exhaust paths (6), (
6) makes it possible for air to be exhausted from the inside of the valve box to the atmosphere and for air to be drawn into the inside of the valve box from the atmosphere. As shown in Fig. 1, when the liquid level in the valve box rises to the set level, the valve body (4) comes into contact with the stopper (10) due to the rising force of the float (2), and the exhaust port ( When the valve body (4a) is in the raised closed position where it is in contact with the entire valve seat surface (11) of the valve body (5), both of the two exhaust ports (5) are closed, and the valve body (1) is closed. ) to prevent fluid from flowing out.

Two exhaust ports (5) as shown in Figures 1 and 3
, (5) so that the areas (S) of the two cylinder bodies (7), (5) are equal and the two exhaust ports (5), (5) are arranged at equal intervals in the circumferential direction of the valve box. Even if the pressure inside the valve box (Pυ) is greater than the pressure outside the valve box (P2), the downward opening operation of the valve body (4) due to the drop in the liquid level inside the valve box will cause the liquid level to drop. It is designed to quickly respond to changes.

That is, due to the pressure difference, two valve body parts (4a)
, (4a) A pressing force (F) that presses it toward the exhaust port (5) acts on each of them, and this pressing force (F) is F = S
oX (P+ Pg) So = -Tds”ds
: Determined by the valve seat diameter, due to the arrangement of the two exhaust ports (5), (5), the pressing force (F) acting on one valve body part (4a) and the other valve body part (4a) Pressure force (F
) is the valve body part (4a), and (4a) is the rod (4b
), the valve element (4) is not actually pressed against the exhaust port (5), regardless of the pressure difference.

[Another example]

Three or more exhaust ports (5) may be provided.

The valve body may not be connected to a float and may be configured to be opened and lowered only by the weight of the valve body itself.

Moreover, the exhaust port (5) and the valve body part (4a) are formed in an inclined direction, so that when the float (2) rises, the valve body part (4a)
is pressed against the exhaust port (5) to improve water-stopping performance in the closed state.
) may be constructed and implemented so as to cancel out the pressing force acting on the In short, the exhaust ports (5) are oriented sideways or diagonally, that is, are inclined at an angle of 90' or 90° with respect to the vertical direction, and are formed by dispersing them in the circumferential direction of the valve box. Bye.

Valve bodies that open and close multiple exhaust ports include valve bodies that have various specific shapes, such as a valve body that has multiple opening and closing surfaces that act on multiple exhaust ports individually. may be adopted. That is, any valve element that can open and close a plurality of exhaust ports at the same time is sufficient, and is referred to as a valve body that opens and closes a plurality of exhaust ports at the same time.

In addition to sewage, the present invention can also be applied to valves that degas various liquids such as tap water and agricultural water, and can also be applied to air valves that degas tanks other than pipes. can.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the air valve according to the present invention, and FIGS. 1 and 2 are sectional views of the entire air valve, and FIG. 3 is a plan view of the exhaust port installation part. FIG. 4 is a sectional view of a conventional valve. (4)...Valve body, (5)...Exhaust port.

Claims (1)

[Claims] A plurality of exhaust ports (5) inclined with respect to the vertical direction, (
5) are formed on the inner surface of the valve box by dispersing them in the circumferential direction of the valve box, and are provided with a valve body (4) that simultaneously opens and closes the exhaust ports (5), (5).