JPS63176882A - Pneumatic valve - Google Patents

Abstract

PURPOSE:To smooth the opening performance of a small air hole without increasing the weight of a float, by arranging the small air hole at a position which is apart from the virtual, vertical line passing through the center of gravity of the float toward one side. CONSTITUTION:A small air-hole 11 is arranged at a position, which is apart from the virtual, vertical line N passing through the center of gravity G of a float 3 toward one side of the float 3. When the float 3 goes down, while it is adsorbed to the small air-hole 11 because of a pressure difference between the internal pressure of a valve box and the atmospheric pressure, moment Wl2; where l2 is the distance between the virtual, vertical line N and the small air-hole 11 and W is the weight of the float; acts on the float 3. Owing to the force-multiplying action governed by the principle of the lever, this moment makes the valve-disc-part of the float 3 break away from the small air-hole 11, surpassing the adsorption force of the float 3.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an air valve that automatically removes gas from inside a pipe or a tank while preventing the outflow of handled liquid. The present invention relates to an improvement in an air valve in which a floating valve element that is pushed up by the rising of the float and closes the vent hole is provided with a small ventilation hole that is closed by contact with the valve element part of the float and opened by the lowering and separation of the float.

[Conventional technology]

Conventionally, in the above-mentioned air valves, the ventilation holes were simply arranged and formed on the central axis of the float, that is, on the virtual vertical line passing through the center of gravity of the float (for example,
4-40533).

[Problem that the invention seeks to solve]

However, with conventional models, if the opening area of the ventilation hole is increased, the opening function of the float when opening and closing the ventilation hole is impaired, and the automatic gas evacuation function of the float and the ventilation hole is deteriorated. However, there is a restriction that the opening area of the ventilation hole must be made quite small, which makes the ventilation hole easy to clog, and the amount of gas discharged per hour by the ventilation hole is small, resulting in poor exhaust efficiency. There was a low problem.

In other words, when the opening area of the ventilation hole is increased, the opening area of the ventilation hole is increased due to the pressure difference between the internal pressure of the valve box and the atmospheric pressure.

The opening function is impaired because the float adsorption force (the adsorption force of the float to the valve body part) becomes large.
This became a hindrance and caused the problems mentioned above.

It is possible to increase the opening area of the ventilation hole by increasing the weight of the float to cope with the float adsorption force, but this may interfere with the automatic opening and closing of the floating valve body by the float, or the float may This increases the size of the valve, leading to problems such as the overall size of the valve.

The purpose of the present invention is to make it possible to increase the opening area of the ventilation hole by a rational and simple improvement while maintaining good opening function of the ventilation hole and without increasing the weight of the float. The point is to make it.

[Means for solving problems]

A characteristic configuration of the air valve according to the present invention is that a small ventilation hole is provided in the floating valve body so as to be closed by contact with the valve body portion of the float and opened by the descent and separation of the float. The float is disposed at a position away from the vertical line, and is housed in the valve box in a manner that allows the float to tilt when descending.The functions and effects thereof are as follows.

[For production]

In other words, as shown in Fig. 5, if the ventilation hole (11) is placed away from the virtual vertical line (N) passing through the center of gravity (G) of the float (3) to one side, the valve box When the float (3) descends while being attracted to the ventilation hole (11) due to the differential pressure between the internal pressure and the atmospheric pressure, the horizontal separation between the virtual vertical line (N) and the ventilation hole (11) occurs. A moment (W 12) due to the float weight + 1 (W) is applied, and due to the moment action, the valve body portion of flows 1 to (3) (in this example, the float weight) has a boosting effect based on the lever principle. overcomes the float adsorption force and creates small ventilation holes (1
Leave from 1).

The ventilation hole (11) that can be adopted in the conventional type, that is, the type in which the ventilation hole (11) is arranged on the virtual vertical line (N) passing through the center of gravity (G) of the float (3), as shown in FIG. The hole opening area (A2) and the ventilation hole opening area (A1) that can be obtained by applying the present invention (see FIG. 5) are expressed as Δp, the differential pressure between the internal pressure of the valve box and the atmospheric pressure, and When comparing the float weights assuming that the float weights are equal to each other, the condition for opening the ventilation hole (11) in the conventional model is A2×Δp<W □■, whereas the condition for opening the ventilation hole (11) in the model to which the present invention is
) is open as follows: A, XΔpXj! , <WX#2 □■, and AH=Az X Ilz/1+ □■ is obtained from equations 0 and 0.

Cocote, l 2- it 1 HA hypothetical 13th straight 'eA(N
) and the ventilation hole (11) in the horizontal direction,
7!2-z,>0, that is, ffz/6+>1, so from equation 0, A+>Ax.

〔Effect of the invention〕

In other words, while maintaining the opening function of the ventilation hole (in other words, the automatic gas discharge function by the float and the ventilation hole), and without increasing the weight of the float, the opening area of the ventilation hole can be reduced from the previous size. As a result, the problem of clogging in the ventilation holes can be reduced, and the efficiency of gas discharge through the ventilation holes can be increased. We have created an air valve with excellent gas discharge performance.

In addition, since there is no need to increase the weight of the float, problems such as the float's automatic opening/closing function of the floating valve body (i.e., rapid large-volume gas discharge function) or the increase in the size of the valve box will not arise. None.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Figures 1 and 2, the valve box (2) has a lower inlet (1) that communicates with the interior of piping, tanks, etc. that require air removal, and the valve box (2) rises and falls as the water level inside the valve box changes. An annular float (3) and an annular floating valve body (5) that is pushed up by the rise of the annular float (3) and closes the annular vent (4) are arranged concentrically with the lower inlet (1), respectively. It has an internal structure and an air valve.

In the figure, (6) is a cylindrical guide that guides the annular float (3) and the annular floating valve body (5) down y7. (3) and the annular floating valve body (5), and is disposed in the central hole of the annular floating valve body (5), and has a plurality of cutout openings (6a) formed in the circumference at the upper end side.

That is, the cylindrical hole of the cylindrical guide (6) and the plurality of notch openings (6a) form a flow path (f) connecting the lower inlet (1) and the annular vent (4), The float (3) and the floating valve body (5) have an annular shape, and the flow path (
f) up to the notch opening (6a), i.e. to the vicinity of the end of the flow path near the annular vent (4).
), the flow path resistance is reduced and air can be vented smoothly and efficiently.

The valve box (2) is divided into an upper part (2A) and a main body part (2B), and both parts (2^) and (2B) are connected with bolts, and the upper lid part (28) is is the annular vent (4) mentioned above.
, and an inspection opening (8) with an opening (7) facing into the cylindrical hole of the cylindrical guide (6), and an annular vent (4).
) is installed.

The annular float (3) and the annular floating valve body (5) are arranged so that the annular float (3) and the annular floating valve body (5) are separated by a predetermined distance (d).
0), and the annular floating valve body (5) has a ventilation hole for communicating the inside of the valve body (2) and the annular vent (4) when the valve body (5) is closed. The hole (11) is arranged and formed at one position in the circumferential direction of the annular floating valve body (5).

The ventilation hole (11) is provided with an annular valve seat (12) that acts as a contact seal against the upper surface of the annular float (3), and when the annular float is in a raised state, the annular valve seat (12) and the upper surface of the float are connected to each other. The ventilation hole (11) is closed by contact with the vent hole (11).

In other words, as shown in Fig. 3, when there is no air pocket in the valve box (2) and the valve body (2) is filled with liquid,
As the temperature rises, the annular floating valve body (5) is closed and the small ventilation hole (11) is closed to prevent liquid from flowing out.

Furthermore, as shown in Figure 1, when a large amount of air enters the valve body (2) from the lower inlet (1), the accompanying descent of the annular float (3) causes the annular floating valve body (5) to move. The valve is opened and the ring 4 is caused to rapidly exhaust a large amount of air through the vent (4).

On the other hand, as shown in Fig. 4, when a small amount of air is trapped inside the valve body (2), the set dimension (d) that allows for vertical separation between the annular float (3) and the annular floating valve body (5) is set. It is lowered within the vent hole (11) to open only the ventilation hole (11), and the trapped air is discharged from the ventilation hole (11).

In this state, the annular floating valve body (5) has a pressure inside the valve box (
Differential pressure between Pl) and atmospheric pressure (Pl) (Δp=pl Pz
) keeps the valve open.

Regarding the opening and closing of the ventilation hole (11) by the annular float (3), the ventilation hole (11) is arranged at one position in the circumferential direction of the annular valve body (5) arranged concentrically with the annular float (3). By doing so, the center of gravity of the annular float (3) (
By arranging the ventilation hole (11) at a position away from the virtual vertical line #g (N) passing through G) toward one side, an air pocket is generated in the valve box (2) as described above, and the annular float (3
) is lowered, the annular float (3) closes the ventilation hole (11) due to the differential pressure (Δp) between the valve box internal pressure (Pυ and atmospheric pressure (Pl)).
Even when the virtual vertical v
Float weight caused between A (N) and ventilation hole (11) in the horizontal direction, moment side due to LL (W) 1
2) acts, and the annular float (3) overcomes the suction force by the ltj force action based on the lever principle, and the ventilation hole (11) (
Specifically, it is designed to smoothly separate from the annular valve seat (2).

In other words, by smoothing the separation from the ventilation hole (11) as described above, it is possible to increase the diameter of the ventilation hole (11), and prevent clogging of the ventilation hole (11). It is designed to smoothly discharge accumulated air from the ventilation hole (11).

In the figure, (13) is a small protrusion formed on the annular floating valve body (5) as a moment fulcrum in order to make the moment effect effective as described above.

[Another example]

Next, other embodiments of the present invention will be listed.

The float (3) may have a cylindrical shape instead of an annular shape, and the floating valve body (5) that is pushed up by the rise of the float (3) and closes the vent (4) may also have an annular shape. Alternatively, they may be formed into a disk shape, and the specific shapes of the float (3) and the floating valve body (5) can be changed in various configurations. The hole (11) may be placed at a position away from the virtual vertical line (N) passing through the center of gravity (G) of the float (3) toward one side.

A plurality of ventilation holes (11) may be provided, but in that case,
The small ventilation holes (11) are collectively arranged at one location in the circumferential direction of the floating valve body (5), that is, at a location closer to one side of the above-mentioned virtual vertical line (N).

Direct contact with the top surface of the float (3) will open the ventilation hole (1).
Instead of closing 1), a small ventilation hole (
11) may be attached to the valve seat part for closing the small ventilation hole (11). .

In the above embodiment, in order to make the moment effect effective, the small protrusion (13) was formed on the floating valve body (5) as a moment fulcrum, but there are various specific structures for forming the moment fulcrum. can be improved, and is not limited to the small protrusion configuration.

The gases to be vented by the air valve according to the present invention include, in addition to air,
Any liquid may be used, and the liquid handled by the piping system or tank to which the air valve according to the present invention is attached is also not limited.

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]

1 to 5 show embodiments of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIGS. 3 and 4 are in operation. FIG. 5 is a diagram explaining the principle. FIG. 6 is a diagram showing the principle of conventional operation. (2)...Valve box, (3)...Float, (4)...Vent, (5)...Floating valve body, (11 )...Vent hole, (G)...
...Center of gravity, (N)...Virtual plumb line.

Claims (1)

[Claims] The floating valve body (5) is pushed up by the rise of the float (3) installed in the valve box (2) and closes the vent (4), and the valve body portion of the float (3) comes into contact with the floating valve body (5), and An air valve provided with a small ventilation hole (11) that opens when the float (3) is lowered and separated,
3) The ventilation hole (11) is placed at a position away from the virtual vertical line (N) passing through the center of gravity (G) to one side, and the float (3) is tilted when lowering. The air valve is installed in the valve box (2) in a state where it is allowed to operate.