JPS6218790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a float valve in which a valve body is opened and closed by the vertical movement of a float. It ensures the opening and closing of a valve by converting a slow movement into intermittent large sudden movements, and relates primarily to float valves used as air vent valves.

B. Prior art and its problems FIG. 5 shows an example of a conventional float valve. In this float valve, a valve body 9 is connected to a float 2, and the float 2 is moved up and down according to fluctuations in the liquid level within the valve box 1.

As shown in FIG. 5, the float valve with this structure is operated from the inlet 11 into the valve body 1 in a steady state where air is stored in the upper part of the valve body, that is, in a state immediately before the valve body 9 opens. When air flows into the valve body 1, the liquid level drops even if the amount of air is small, the float 2 drops a small amount, the valve body 9 moves away from the valve seat port 7, and the air in the valve body 1 is exhausted. . Further, if the air in the valve box 1 is exhausted and the liquid level rises even a little, the valve body 9 closes the valve seat port 7.

Therefore, in the float valve having this structure, the valve body 9 and the valve seat port 7 are always in the critical state of opening and closing.
When the valve is in the open state, the valve does not open wide, and in the closed state, the valve body is not pushed up strongly and the valve does not close reliably.

However, when a large amount of air flows into the valve box 1 at once, the valve body 9 descends greatly and opens the valve widely. However, the float valve used to bleed air from inside the piping is used to separate fine air bubbles contained within the piping, and a large amount of air bubbles are rarely sent in at once.

In addition, even if a large amount of air flows in and the valve is temporarily opened wide, the valve body 9 will not be strongly pressed against the valve seat port 7 in the closed state, preventing leakage in the closed state. There was a drawback that it could not be reduced. Therefore, the conventional float type shown in FIG. 5 has the disadvantage that droplets leak when the valve is closed, and reliability and durability are not sufficient in terms of reliability of opening and closing operations of the valve.

The reason for this is that the movement of the float in these conventional float valves is minute, so the lift of the valve is small, and the valve repeats minute opening and closing, which causes the valve's closing surface pressure to be small, and the valve body and The durability of the valve seat is deteriorated, and dust is easily trapped in the valve seat contact surface.

That is, the conventional float valve shown in FIG. 5 has a float 2 floating in a valve box, and a valve body 9 connected to the float 2. The valve opens when the float 2 falls below a certain level. However, in a float valve with this structure, when air bubbles flow into the valve box 1, the bubbles immediately float to the top of the valve box 1 and close the valve when the liquid level rises above a certain level. descend. Therefore, each time air bubbles flow in, the float 2 drops by a certain amount and the valve opens, and when the inflowing small amount of air is discharged, the float 2 rises and closes the valve.
Therefore, the vertical movement of the valve body 9 is slight, and the valve body 9 repeatedly opens and closes in a state close to the limit of valve closing and opening, resulting in the above-mentioned drawbacks.

In order to eliminate this drawback, the present inventor provided a gas accumulation chamber at the lower end of the float, temporarily stored air bubbles flowing into the valve box in this accumulation chamber, and after a certain amount of gas was stored, developed a float valve that simultaneously discharged the gas in the storage chamber into the valve box by breaking the surface tension (Japanese Patent Publication No. 59-27475).

When this float valve is closed, the gas in the storage chamber increases the buoyancy of the float and closes the valve securely, and when the valve is opened, a large amount of gas in the storage chamber is discharged into the valve box at once. This causes the liquid level to drop significantly, and the buoyancy of the float also decreases rapidly, causing the valve body to open wide. That is, when the valve is in the open state, the valve body opens widely and reliably, and when the valve is closed, the closing surface pressure of the valve body is strong and the valve can be closed reliably.

However, in a float valve with this structure, when the surface tension is broken and the air in the storage chamber is discharged, a large amount of air is discharged at once, which causes the float to oscillate violently, making it difficult to ensure the reliability and stability of valve operation. There remained a problem.

The present invention eliminates this drawback and has even more excellent features.An important object of the present invention is to provide a float valve that can open and close the valve reliably and minimize leakage.

Another important object of the present invention is that even though the float can move up and down reliably, it can suppress the violent movement of the float when air is discharged from the storage chamber of the float. The purpose is to provide a float valve that can be more stabilized.

C. Means for solving conventional problems A float valve consists of a valve box, a float floating in the valve box, and is connected to the float so that it opens when the float is lowered and opens when the float is raised. and a valve body that closes the valve.

The float has a gas storage chamber that is open at the bottom, and the opening at the bottom of the storage chamber is located below the liquid level within the float.

Furthermore, an outflow hole is bored through the float and communicates with the storage chamber, and the opening of the outflow hole outside the float is located below the liquid level in the valve body.

On the other hand, the valve box is located below the storage chamber and has an inlet opening.

Furthermore, the float is held movably up and down by means for preventing it from falling.

D. Function The function of the float valve shown in FIGS. 1 to 4, which shows a preferred embodiment of the present invention, will be explained.

Initially, hot water flows in from the inlet 11 while the inside of the valve box 1 is completely filled with air, and this hot water causes the float 2 to float as the air inside the valve box 1 is removed.
The valve seat port 7 is closed by the valve body 9 connected to the float 2, and the valve is closed.

When air bubbles flow into the valve box 1 from the inlet 11 in this state, the air bubbles first accumulate in the accumulation chamber 15. After that, when bubbles flow into the valve box 1 one after another, they accumulate in the accumulation chamber 15, and the buoyancy of the float 2 increases temporarily.

At this time, the maximum amount of air that can accumulate in the storage chamber 15 protrudes further downward from the lower end of the opening of the storage chamber 15, as shown by the boundary line 16 shown in the actual battle in FIG. 1, due to the surface tension of the water. When the boundary line 16 protrudes from the lower end of the opening of the storage chamber 15, the boundary line of the opening end in the valve box of the outflow hole 17 communicating with the storage chamber 15 also protrudes somewhat into the liquid, although not shown. When the amount of air accumulated in the accumulation chamber 15 increases further in this state, the surface tension makes it impossible to accumulate any more air in the accumulation chamber 15, and the surface tension at the opening end of the outflow hole 17 is destroyed, causing the accumulation to continue. The air is simultaneously released from the outflow hole 17 into the valve box outside the float, and the buoyancy of the float 2 rapidly decreases.

At this time, once the surface tension at the opening of the outflow hole 17 is broken, the air in the storage chamber 15 is continuously flowed out, and a large amount of the air in the storage chamber 15 is discharged at once.

However, when a large amount of air flows into the storage chamber 15 from the inflow port 11 at once, the air in the storage chamber 15 is discharged to the outside of the float from both the outflow hole 17 and the lower opening of the storage chamber 15.

When the air is discharged from the accumulation chamber 15, the buoyancy of the float 2 decreases, and the liquid level in the valve body 1 drops, causing the float 2 to drop down a wide width and push against the valve body 9.
opens wide.

As the valve body 9 opens and the air inside the valve body 1 is discharged, the liquid level within the valve body 1 rises and the valve body 9 closes. Thereafter, the air that subsequently flows in is similarly once accumulated in the accumulation chamber 15, and then heads towards the upper part 13 in the valve box, lowering the hot water level 3 and opening the valve.

The storage chamber 15 provided in the float stores air there and discharges it at once to rapidly reduce the buoyancy of the float 2. When the amount of air discharged from the storage chamber 15 at one time is considerably large, the float 2 descends each time the air is discharged from the storage chamber 15 until the valve body 9 closes.

However, if the amount of air discharged from the storage chamber 15 at one time is small, the valve body 9 may open only after the storage chamber 15 has discharged air a plurality of times. In this case, each time the storage chamber 15 discharges air due to surface tension breakdown, the hot water level in the valve body 1 drops step by step, and after the hot water level has dropped several times, the valve body 9
is opened and the air inside the valve box 1 is exhausted all at once, and then the float 2 is raised and the valve is closed.

This condition tends to occur when the pressure inside the valve box is high and the area of the gap 6 communicating with the jet nozzle 5 is large.

E Preferred embodiment Specific examples of the present invention will be described below.

The float valve shown in FIG. 1 includes a valve box 1, a float 2 floating in the valve box 1, a valve body 9 connected to the float 2, and a float 2 that can be moved up and down, but can be tipped over. and an overturn prevention means for holding the vehicle in a state where it does not fall.

The valve box 1 is open at both upper and lower ends, the valve seat 4 is fixed to the upper opening, and the lower opening is an air inlet 1.
1, and the inlet 11 is located below the accumulation chamber 15 of the float, so that the air bubbles flowing in from this inlet 11 float to the accumulation chamber 15 of the float 2, and the valve seat 4 moves itself up and down. An air jet nozzle 5 is formed to penetrate in the direction, and the lower part of the jet nozzle 5 forms a valve seat opening 7 .

The float 2 has a skirt 14 formed around its lower periphery, the skirt 14 forming an accumulation chamber 15 with a downward opening, and a core rod 10 that passes vertically through the center of the float 2 and is fixed to the core rod. A valve body 9 is connected to the upper end of the valve body 10 by a free joint that can freely move by a predetermined distance in the vertical direction, and the upper end of the valve body 9 is formed into a sharp point so that the valve seat opening 7 can be closed off in a confidential manner. It is.

As shown in FIGS. 2 to 4, an outflow hole 17 such as a small hole or notch for venting air is formed through the skirt 14 of the float or the float body. Fig. 2 shows a structure in which a small outflow hole 17 is drilled through the skirt 14, Fig. 3 shows a structure in which a part of the skirt 14 is notched vertically to form an outflow hole 17, and Fig. 4 shows a structure in which a small outflow hole 17 is formed by penetrating the skirt 14. A small outflow hole 17 is bored through the main body.

Since the outflow hole 17 is opened into the liquid in the valve box 1, the opening end surface is closed by the surface tension of the liquid.
The required amount of air accumulates in the accumulation chamber 15 and the outflow hole 17
Air will not flow out unless the surface tension at the open end of the tube is broken.

The overturn prevention means prevents the float 2 from overturning, thereby ensuring a volume in which a required amount of air can be stored in the downwardly opened accumulation chamber 15, and further preventing air bubbles flowing in from the air inflow port 11 from accumulating. The float 2 is arranged at a position where it floats in the chamber 15, and the float 2 is held so as to be movable up and down. In FIG. 1, the lower end of the core rod 10 fixed to the float 2 is movable up and down. The lower guide 12 is inserted through the lower guide 12, and the guide 8 holds the valve body 9 in a vertically movable manner.
However, FIG. 1 shows an example of the fall prevention means, and it goes without saying that the shape of the fall prevention means is not limited to this shape.

F Effect In a float valve, a descending force is generated on the float as the liquid level falls, and when this force approaches the force pushing up the valve body due to the internal pressure of the valve box, the closing surface pressure of the valve seat decreases.

By the way, in the case of the conventional float valve shown in FIG. 5, when air bubbles flow into the valve box 1 and the level of the hot water surface 3 decreases, the closing surface pressure of the valve seat decreases.
When air easily leaks from the valve seat and a small amount of air leaks, the hot water level 3 rises and the float 2
The descending force becomes smaller and the valve closes. Therefore, the valve rarely opens wide, and foreign objects caught in the valve seat cannot be removed by air flow.

On the other hand, in the float valve of the present invention, since the buoyancy of the float intermittently suddenly decreases as described above (that is, the descending force of the float intermittently increases rapidly), the float valve changes from the closed state without leakage. Open the valve promptly,
Also, even if there is some leakage at the beginning of valve closing,
The air stored in the float's storage chamber increases buoyancy and the valve closes completely without leaks.

That is, in the float valve of the present invention, when more than the required amount of air is sent in, the valve fully opens and releases the air to the outside, and when the release of air is finished, the valve fully closes.
Performs perfect shutoff operation.

In the conventional float valve shown in FIG. 5, the buoyancy tends to gradually decrease after the valve is closed until the next valve is opened, but in the float valve of the present invention, even after the valve is closed, the buoyancy tends to gradually decrease. The air accumulated in the storage chamber temporarily increases the buoyant force, increasing the closing surface pressure on the valve seat contact surface, and immediately before the valve opens, the buoyant force suddenly decreases, causing a sudden downward force to be applied to the float. As a result, the float descends quickly and the vertical movement of the float is carried out extremely reliably.

Furthermore, in addition to this, a notable feature of the float valve of the present invention is that the surface tension is broken and the air is evacuated from the float's accumulation chamber, so that there is no violent movement when the float is lowered. , the vertical movement of the float is more stabilized, and the reliability of operation is further improved.

This feature is due to the storage chamber provided in the float.
This is realized by a unique configuration in which the valve body is communicated with the outside of the float below the liquid level in the valve box through the outflow hole.

That is, in the float valve of the present invention having this structure, the air in the storage chamber provided at the lower end of the float is discharged at once when the surface tension is broken, but the air in the storage chamber is discharged to the outside of the float through the outflow hole. Compared to conventional float valves, in which all the air in the storage chamber is instantly exhausted from the opening at the bottom of the storage chamber, the air is discharged more gently, and the float does not oscillate when surface tension breaks. It can be prevented.

Therefore, the vertical movement of the float is more stabilized and the reliability of operation is further improved.

In addition, the float is held in a state where it can move up and down but does not fall over by the fall prevention means.
The air flowing in from the inlet floats into the storage chamber without leaking to the outside, and since the float does not tilt, the effective volume of the storage chamber that is open at the bottom does not decrease, and the vertical movement of the float with the storage chamber is more reliable. become.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a float valve showing an embodiment of the present invention, Figs. 2 to 4 are enlarged sectional views of the skirt portion of the float, and Fig. 5 is a sectional view of a conventional float valve. . 1... Valve box, 2... Float, 3... Hot water surface,
4... Valve seat, 5... Spout, 6... Gap, 7...
Valve seat port, 8... Guide, 9... Valve body, 10... Core rod, 11... Inflow port, 12... Lower guide, 13
... Upper part of the valve box, 14 ... Skirt, 15 ... Accumulation chamber, 16 ... Boundary surface when air accumulates in the skirt, 17 ... Outflow hole.

Claims (1)

[Claims] 1. A float valve comprising a valve box, a float floating in the valve box, and a valve body connected to the float that opens when the float is lowered and closes when the float is raised. The float has a gas storage chamber that is opened at the bottom, and the storage chamber has an opening at the lower end located below the liquid level in the float, and the storage chamber has a gas storage chamber that is opened at the bottom. An outflow hole is bored through the float in communication with the outside opening of the outflow hole located below the liquid level in the valve box, and the valve box is further provided with a hole in the accumulation chamber. What is claimed is: 1. A float valve, characterized in that the inlet is opened at a lower position, and the float is held movably up and down by means for preventing overturning.