JPH04224380A - Float type valve - Google Patents

Abstract

PURPOSE:To heighten an explosion-proof quality and at the same time hold stable liquid level (gas pressure) by making such arrangement that a valvular plunger made of a magnetic material may be moved by means of the magnetizing force of magnets simultaneously with a magnet movement integral with a float movement. CONSTITUTION:When a liquid in a container 38 ascends in order, the liquid flows into a cover body 18 through a circulation hole 21, and as the liquid surface ascends, a float 17 also ascends. As a result, a magnet holder 15, that is, a pair of magnets 14a, 14b, formed integrally with the float 17 is likewise moved, too, and as it moves, a plunger 11 formed of a magnetic material is moved upward by magnetic force, and a diaphragm 6 is butted against a valve seat 31 through a plunger seat 10, and a closed valve state is brought about. Conversely, when the liquid surface descends, the float 17 and magnets 14 also descend, and the diaphragm 6 is separated from the valve seat 31, so the liquid flows out into the container 38 through a discharge pipe 20 via the valve from an inlet 29.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a float type valve.

0002

[Prior Art] Conventionally, in a float type valve, a float disposed in a container moves to a different position depending on the buoyancy when it is a liquid, and depending on the gas pressure when it is a gas. The coil is operated to open and close the valve. Alternatively, the opening/closing of the valve or the flow rate control is performed using a mechanical structure in which a float having long levers at different positions is moved up and down in the same manner as described above.

0003

SUMMARY OF THE INVENTION The above-described float type valve has the following problems. That is, in a valve that is opened and closed using an electromagnetic coil, it is necessary to control the plunger by supplying electricity to the electromagnetic coil, which increases equipment costs. Additionally, when used with explosive liquids or gases, equipment costs are high due to the need for an air-proof structure. On the other hand, in the case of a float structure with a long lever, the container becomes large due to the long lever, and the flow of fluid is stopped by ON/OFF control, and the float directly receives changes in the liquid level, so the displacement of the float causes the valve to open. It is difficult to control the liquid level (gas pressure) at a constant level because the gas is opened and closed. Therefore, the float type valve of the present invention eliminates such inconvenience.

0004

[Means for Solving the Problems] The float type valve according to claim 1 comprises: a plunger attached to the valve and made of a magnetic material; a plunger holder into which the plunger is movably fitted; The plunger includes a magnet holder movably attached to the jar holder and provided with a float, and a magnet disposed on the magnet holder at a position corresponding to the plunger. Also, claim 2
The float-type valve according to claim 1 comprises: a cover for protecting the float of the float-type valve according to claim 1; a communication hole bored in the cover;
It has the following.

[0005]

[Function] The float type valve according to claim 1 is controlled to open and close by the following function. That is, the magnet moves together with the movement of the float, and at the same time, the plunger made of a magnetic material also moves in the same way due to the magnetic force of the magnet. Therefore, the valve attached to the plunger moves and opens and closes against the valve seat to stop the inflow of fluid. In the float type valve according to claim 2, the float is covered with a cover, and liquid (gas) flows in through the communication hole formed in the cover, and the liquid level (gas pressure) of the liquid causes the float to be covered with a cover. The float moves. However, since the liquid level (gas pressure) that affects the float is transmitted through the communication hole, fluctuations are not directly transmitted. Therefore, it is possible to control the liquid level (gas pressure) with higher accuracy.

[0006]

[Example] The present invention will be explained with reference to an example. FIG. 1 is an overall side sectional view of a float type valve. Cylindrical container 3
Reference numeral 8 is a locking nut 3 screwed onto the body 5 and attached via a packing 4. A cap nut 2 sealed with a rubber packing 1 is screwed onto an inlet portion 29 at the left end of the body 5 in which a flow path 30 is formed to connect an inflow pipe (not shown). Further, an elbow 9 is fitted to the right end of the body 5 via an O-ring 8 for sealingly connecting a discharge pipe 20 having a circular cross section. A plunger guide 13 is vertically provided at the lower center end of the body 5 and has an insertion hole 33 into which a plunger 11 (described later) can be movably inserted. Note that a stop portion 3 is provided at the end of the plunger guide 13 to restrict movement of the magnet holder 15, which will be described later.
5 is provided protrudingly. There is an entrance 29 at the bottom of the center of the body 5.
A valve is formed to shut off the exhaust pipe 20 and the discharge pipe 20, and in this embodiment, it is a diaphragm type valve. The diaphragm type valve is composed of a diaphragm plate 7 with a valve seat 31 hanging down from the upper end of the body 5 and a diaphragm 6 mounted at a position where it can come into contact with the valve seat 31.
is pressed by the plunger 11 movably inserted into the insertion hole 33 via the plunger seat 10. Although the plunger 11 is a hollow cylinder and is made of a magnetic material, it is not necessary to make the entire plunger 11 of a magnetic material, and it may be formed to be movable by magnetic force relative to the movement of a magnet 14, which will be described later.

On the other hand, the magnet holder 15 is movably fitted onto the plunger 11, and a screw 36 is formed in the lower part thereof so that the mounting position of the float 17 can be adjusted. The float 17 has a hollow cylindrical shape that generates a pressing force to close the valve due to buoyancy in the case of liquid (gas pressure in the case of gas), and is fixed to the magnet holder 15 via the screw 36. Incidentally, the float 17 can be adjusted to the position shown by the broken line in FIG. 1 so that the liquid level can be arbitrarily selected. Further, the magnet holder 15 has a pair of magnets facing each other at a position corresponding to the plunger 11, that is, at a height position where the magnetic field of the magnet 14 can influence the plunger 11 and can be moved according to the movement of the magnet 14. 14a and 14b are arranged (Fig. 2 (Fig. 1)
). In addition, a pair of magnets 14a
, 14b, as shown in FIG.
4b is arranged as S(N) pole on the plunger 11 side, and as shown in FIG. It may be N (S) pole. With these different arrangements, the polarity effect of the magnet 14 (
Due to the force of repulsion and attraction, the lower end of the plunger 11 stops at the approximate center of the magnet 14 in the case shown in FIG. 3, but in the case shown in FIG. This will be explained in detail in 2012, but it should be selected as appropriate depending on the valve structure. Incidentally, a cover 18 having a lid 19 fitted and fixed to the lower end is vertically disposed on the plunger guide 13 on the outer circumference of the float 17 in order to protect the float 17 from fluctuations in the liquid level. Further, a communication hole 21 is provided in the center of the lid 19 to allow liquid to flow into the cover 18. In addition, this communication hole 21
In the case of gas, the drilling position may be anywhere, but in the case of liquid, it is determined by considering the liquid level.

Next, the operation of the above structure will be explained. As the liquid in the container 38 gradually rises, the liquid flows into the cover 18 through the communication hole 21, and as the liquid level rises, the float 17 also rises. That is, the float 17 moves upward in FIG. Therefore, the magnet holder 15 formed integrally with the float 17, that is, the pair of magnets 14a and 14b also moves in the same way. As the magnets 14a and 14b move, the plunger 11 made of a magnetic material moves upward due to magnetic force.
The diaphragm 6 contacts the valve seat 31 via the plunger seat 10, resulting in a so-called valve closed state. That is, the state shown in FIG. 1 is reached.

On the other hand, when the liquid level falls, the float 17 and magnet 14 also fall, and the plunger 11 moves down. Note that the limit of descent is up to a stop 35 formed at the end of the plunger guide 13. As a result, the upward pressing force of the plunger 11 disappears, and the diaphragm 6 separates from the valve seat 31. A so-called valve open state is established, and the liquid flows out from the inlet 29 through the valve and from the discharge pipe 20 into the container 38. When the liquid level rises due to this flow rate, the float 17 rises, and the valve opening gradually decreases until the valve is finally closed and the liquid level in the container 38 is maintained constant. As mentioned above, the valve opening degree is determined by the position of the float 17, and the float 17 descends until the magnet holder 15 is stopped at the stop part 35, and the valve becomes fully open. The valves are sequentially closed. Therefore, it becomes possible to control the inflow flow rate with respect to the liquid level.

Furthermore, since the cover 18 is disposed around the outer periphery of the float 17, the float 17 is less affected by fluctuations caused by the liquid flowing in from the discharge pipe 20. That is, since the liquid enters while being restricted by the inflow hole 21, the float 17 is not subject to such fluctuations, and the opening degree of the valve can be adjusted smoothly. On the contrary, even when the liquid level decreases, the liquid is discharged from the inflow hole 21, so that the valve opening degree can be adjusted smoothly as well. It goes without saying that the polar arrangement of the magnet 14 (FIGS. 3 and 4) should be selected taking into consideration the valve structure, that is, the distance that the magnet 14 can move. Even if you use
Alternatively, in the case of the polar arrangement shown in FIG. 3, it may be cylindrical. Although the above embodiments have been described for liquids, gases can be similarly controlled. That is, the float is connected to the inflow hole 2
1, and the upward pressing force in FIG. 1 changes depending on the pressure, so that the balance position changes, and the opening and closing of the valve can be smoothly controlled.

[0011]

[Effects of the Invention] According to the float type valve of the present invention, since no electromagnetic coil is used as in the conventional case, the structure is simple.
Can also be used for explosive fluids. Further, since the float can be provided vertically on the valve, it can be constructed in a small size. Furthermore, by attaching the cover to the float, the float is less susceptible to fluctuations in the liquid level, so a constant liquid level (gas pressure) can be stably maintained.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a float type valve of the present invention.

FIG. 2 is a sectional view taken along line A-A in FIG. 1;

FIG. 3 is a diagram showing the polarity arrangement of magnets.

FIG. 4 is a diagram showing the polar arrangement of magnets.

[Explanation of symbols]

5 Body 6 Diaphragm 7 Diaphragm plate 10 Plunger seat 11 Plunger 13 Plunger guide 14 (14a, 14b) Magnet 17 Float 18 Cover 21 Distribution hole 38 Container

Claims (2)

[Claims] 1. A plunger attached to a valve and made of a magnetic material, a plunger holder into which the plunger is movably inserted, and a magnet movably attached to the plunger holder and provided with a float. holder and
A float type valve comprising: a magnet disposed on the magnet holder at a position corresponding to the plunger. 2. The float type valve according to claim 1, further comprising a cover for protecting the float, and a communication hole formed in the cover.