WO2004086154A2

WO2004086154A2 - Automatic water level control device with float valve using internal water pressure gravity and buoyancy

Info

Publication number: WO2004086154A2
Application number: PCT/KR2004/000641
Authority: WO
Inventors: Hak Jae Lee
Original assignee: Hak Jae Lee
Priority date: 2003-03-27
Filing date: 2004-03-24
Publication date: 2004-10-07
Also published as: KR20040084965A; WO2004086154A3

Abstract

An automatic water level control device with a float valve using internal pressure, gravity and buoyancy includes a valve body connected to a pipe, a valve inserted into the valve body with a distance, a net provided to an inner periphery of an end of the valve body for filtering impurities which deteriorates the operation of the valve, a spring mounted between the valve and the net for protecting the valve under a low pressure and keeping the precision of valve operations by forcibly pushing the valve when a water level becomes high, a supporting die connected to the valve body for transmitting the gravity of a ball to the valve by leverage to control the valve, and the ball mounted to the supporting die for generating the gravity when the water level becomes lowered so as to open the valve.

Description

AUTOMATIC WATER LEVEL CONTROL DEVICE WITH FLOAT VALVE USING INTERNAL WATER PRESSURE GRAVITY AND BUOYANCY

BACKGROUND OF THE INVENTION (a) Field of the Invention The present invention relates to an automatic water level control device with a float valve', and more particularly to, an automatic water level control device properly using three elements of internal water pressure, gravity and buoyancy, wherein at least one or more outlets are provided.

(b) Description of the Related Art

Recently, the water problem has become the one of the most important factors that determines the future of the mankind in addition to the energy problems, and almost no countries are free from the water in the world.

In a prior art float valve, as shown in Fig. 1, water flows into an internal fluid flow tube 1-2 is by connecting a pipe 1-8 with a connection screw 1-1. As a water level in a water tank or a reservoir is increased by the introducing water, the water generates buoyancy to a float 1-6.

The float 1-β floats on the water by a supporting^' die hinge 1-7, which serves as a point of action by leverage. The buoyancy pushes up a valve 1-4 via a supporting die 1-5 for closing an outlet 1-3 so as to block the fluid flow.

If the water pressure is higher than the buoyancy, the water level rises up. In order operate smoothly under the high pressure, the size of the float 1-6 should be increased proportionally. Further, a body part should be formed of a strong material since the buoyancy under the high water pressure is transmitted to the body part. Therefore, a brass material that is easy to process is mainly used for the body part, or engineering plastics are used for the body part. An inlet of the body part formed of either material has a limitation in the diameter size, that is, 4mm maximally.

The prior art has a disadvantage that the brass body part is not separated from a metal pipe after a several years because of the joining caused by the cell effect between different metals, when connecting the brass body part to a metal pipe. Further, a lead used for increasing the machining performance of the brass is partially separated from the brass into drinking water. Most important thing is that the connection part between the float 1-6 and the supporting die 1-5 may be broken by the continuous stress easily. In this case, water is continuously leaked until the pipe is artificially blocked, thereby generating secondary damage resulting in the waste of water.

According to a prior art realizing dual water levels, as shown in Fig. 2c, high and low water level sensors 2-3 and 2-5 are mounted to a water pump 2-1, and a pipe 2-4 is connected to the water pump 2-1. If water reaches the high water level sensor 2-3, the water pump 2-1 stops operating by an electric signal output from the high water level sensor. If the water reaches to the low water level sensor 2-5 by the use in a water tank, the senor outputs an electric signal to drive the water pump 2-1. As described above, the water pump operates continuously. However, the prior art has still disadvantages that the electricity is essentially required and the pipe is newly connected to the water pump. Further, impurities frequently disturb the normal operations of the sensors so that the water leakage of the water supply failure may be generated. In a prior art float valve applied to a toilet, as shown in Fig. 3, a valve 3-2 is lowered with respect to a hinge 3-3 serving as a point of action via a supporting die 3-4 by buoyancy of a float 3-5 as water is introduced via an inlet 3-1. Then, the water flow is blocked by the force of the buoyancy. If a lever 3-7 is driven to open a siphon 3-6, the blocked water is discharged into the toilet. The float 3-5 is lowered by gravity so that the valve 3-2 is opened to discharge the water.

By repeating the above operations, the toilet is filled with a predetermined amount of the water and the water is discharged as necessary.

However, the prior art float valve of this toilet has a disadvantage that the water is leaked when the water pressure is high. Further, noise is generated while the water is filled in the toilet. Furthermore, the water is continuously leaked if not blocked by the outside when the ball is deviated from its position.

SUMMARY OF THE INVENTION

Therefore, the present invention is derived to resolve the above problems and disadvantages of the prior art, and has an object to provide an automatic water level control device with a float valve using internal water pressure, gravity and buoyancy for dispersing water pressure for minimizing the device, wherein at least one or more outlets are formed.

It is another object of the present invention to provide an automatic water level control device, in which water leakage is prevented even though a ball is deviated in response to a first cork is opened by leverage as a float is applied with gravity when a water level is lowered, thereby preventing the water wasting. In the normal state, any parts of a structure are not applied with fatigue. It is still another object of the present invention to provide an automatic water level control device, in which a water level controller is mounted to a side of the float connected to a body part so that the water level is controllable as desired by a user.

It is a further object of the present invention to provide an automatic water level control device to employ synthetic resin variously to reinforce the resistance against pollution and chemicals. If chemical-resistant synthetic resin is employed for the manufacture of the prevent invention device, the device is applicable to sewage treatment sites handling various chemical tanks or chemicals.

It is a still further object of the present invention to provide an automatic water level control device, in which the operation frequency of a valve is reduced in spite of the natural evaporation or leakage of pipes when using a water pump, since an interval between a full water level and a valve opening water level is increased as a water pressure becomes higher. Therefore, the power consumption of the device is reduced while the lifespan of the device is extended.

In order to achieve these objects and others, an embodiment of the automatic water level control device with a float valve using internal water pressure, gravity and buoyancy, includes a valve body 5-1 having a spiral part 5-2 at a side to be connected to a pipe, and a cylindrical connection part 5-6 to be connected to the spiral part, a valve 5-8 inserted into the valve body apart from the inner surface of the valve body 5-1, a net 5-7 provided to an end of the valve body 5-1 for filtering impurities which deteriorates the operation of the valve 5-8, a spring 5-15 mounted between the valve 5-8 and the net 5-7 for protecting the valve 5-8 under a low pressure and keeping the precision of valve operations by forcibly pushing the valve 5-8 when a water level becomes high, a supporting die 5-9 connected to the valve body 5-1 for transmitting the gravity of a ball 5-12 to the valve 5-8 by leverage to control the valve 5-8, and the ball 5-12 mounted to the supporting die for generating gravity when the water level becomes lowered so as to open the valve 5-8.

In. addition, an on-off switch 7-17 is respectively mounted to the connection part 5-6 to open or close the valve.

BRIEF DESCRIPTION OF THE DRAWINGS A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein: Fig. 1 is a view showing a prior art float valve as an example;

Fig. 2 is a view showing a prior art dual water level valve as an example; Fig.3 is a view showing the inside of a toilet employing a prior art valve;

Fig.4 is a view showing the structure of a vertical valve according to a preferred embodiment of the present invention;

Fig. 5a is a cross-sectional view for showing principal parts of a horizontal valve according to a preferred embodiment of the present invention, wherein the principal parts are in the disassembled state;

Fig. 5b is a cross-sectional view for showing the horizontal valve of Fig. 5a, wherein the principal parts are in the assembled state;

Fig. 5c is a view taken along line A-A of Fig. 5b;

Fig. 5d is a view showing the horizontal valve in use;

Fig. 6a is a view showing a horizontal valve modified according to the present invention, wherein the horizontal valve is in the disassembled state;

Fig. 6b is a view showing the horizontal valve of Fig. 6a, wherein the horizontal valve is in the assembled state;

Fig.7 is a cross-sectional view showing principal parts of a valve for a toilet according to the present invention; Fig. 8a is a perspective view of a powerless dual water level valve according to a preferred embodiment of the present invention; and

Fig. 8b is a view for showing the assembled state of a valve body and a supporting die of Fig. 8a.

Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

BEST MODE FOR CARRYING OUT THE INVENTION

Fig.4 is a view showing the structure of a vertical valve according to a preferred embodiment of the present invention. Referring to Fig.4, the vertical valve includes the vertical valve includes a valve body 4-1 connected to a pipe and formed with an inlet 4-la for introducing water via the pipe, a supporting die 4-8 connected to the valve body 4-1 by a hinge 4-5, and a ball 4-10 mounted to an end of the supporting die 4-8. The valve body 4-1 further includes a plurality of outlets 4-lb communicated to the inlet 4-la for discharging the water. The vertical valve further includes first and second valves 4-3, 4-4 inserted into the valve body 4-1 and closely contact upper ends of the outlets 4-lb, a spring 4-2 provided on the first and second valves 4-3,4-4, first and second corks 4-6,4-7 formed at an end of the supporting die 4-8 for pushing the first and second valves 4-3,4-4 to open or close the outlets 4-lb, a water level controller 4-9 formed at the other end of the supporting die 4-8 for moving the ball 4-10 in the vertical direction, a supporting die float 4-16 provided outside the supporting die 4-8, and the ball 4-10 mounted to the water level controller 4-9 of the supporting die 4-8, the ball being filled with water 4-11 inside and provided with a buoyancy element 4-12 at an upper end.

The water level controller 4-9 is in the gear shape and the ball 4-10 is movable in the vertical direction along with a gear part of the water level controller 4-9.

In the above structure, water passing through the inlet 4-la is controlled by the valves 4-3,4-4 along the pipe and blocked by internal water pressure and the spring 4-2. As a drain valve (not shown) of a reservoir is opened, the water is discharged and the water level is lowered. Then the supporting die 4-8 is lowered with respect to the hinge 4-5 serving as a point of action by the weight of the water 4-11 filled in the ball 4-10 and the supporting die 4-8. Relatively, the first cork 4-6 lifted up to open the first valve 4-3.

The second cork 4-7 lifts up by residual force to open the second valve 4-4, thereby discharging the water. As the drain valve is closed and the water is filled, the water level becomes higher gradually. At this time, if it is assumed that the specific gravity of the ball 4-10 received in the water is 1, a surface of the water 4-11 received in the ball 4-10 is horizontal to the water level outside the ball. The ball

4-10 is further sunk in the outside water by the weight of the water in the ball 4-10 in an exposed part of the ball 4-10.

The buoyancy element 4-12 has air, of which an amount is larger than a weight of the other part. The buoyancy element 4-12 is not filled with water, so that the ball 4-10 lifts on the outside water surface. The valves 4-3,4-4 are closed by the force pressing the spring 4-2 and the internal water pressure, so that the water is automatically blocked.

While repeating the above operations, the reservoir keeps a predetermined water level. At this time, differently from the prior art valve, the supporting die is not applied with any stress in the normal state except when the valves

4-3,4-4 are opened by the gravity applied to the ball 4-10.

The supporting die float 4-16 has an internal space for receiving air, when the water overflows in response to the valves 4-3, 4-4 are opened by the supporting die 4-8 after the ball 4-10 is deviated. The supporting die float makes the supporting die 4-8 lift to close the valves 4-3,4-4. If a plurality of valves is additionally mounted, a discharge amount may be increased by controlling them in sequence.

In a prior art structure, a discharge amount is one several tens of an intake amount. The present invention has an advantage that the discharge amount may be increased by mounting a plurality of valves.

However, there is still a disadvantage that a distance between the hinge and the valve should be small or the ball should be small in this structure if a plurality of valves are mounted. Also, a distance between the corks and the hinge should be long for the sake of circular motion. Therefore, an automatic water level control device has troubles in the manufacture and complicated structure.

In order to resolve the above problems, a side of the supporting die is connected to a side of the ball not to move and both are positioned at desired positions, so that buoyancy parts block the discharge at a predetermined position, thereby obtaining a desired water level. A user may keep the desired water level by controlling the water level control part .

Now, a horizontal valve according to a preferred embodiment of the present invention will be described in more detail with reference to Fig. 5a to Fig. 5d.

Referring to Fig. 5a to Fig. 5d, a horizontal valve includes a valve body 5-1 having a spiral part 5-2 at a side to be connected to a pipe and a cylindrical connection part 5-6, a valve 5-8 inserted into the valve body 5-1 apart from the inner surface of the valve body, a net 5-7 provided to an inner periphery of an end of the valve body 5-1 for filtering impurities which deteriorates the operation of the valve 5-8, a spring 5-15 mounted between the valve 5-8 and the net 5-7 for protecting the valve under a low pressure and keeping the precision of valve operations by forcibly pushing the valve 5-8 when a water level becomes high, a supporting die 5-9 connected to the valve body 5-1 for transmitting the gravity of a ball 5-12 to the valve 5-8 by leverage to control the valve 5-8, and the ball 5-12 mounted to the supporting die 5-9 for generating gravity when the water level becomes lowered so as to open the valve 5-8.

The valve body 5-1 is provided with valve rails 5-3 on an inner peripheral surface to operate the valve 5-8 apart from the valve body 5-1, a outlet 5-5 for discharging water flowing between the valve 5-8 and the valve body 5-1, and a valve contact part 5-4 on a ground surface of the outlet 5-5 for making the valve 5-8 contact the valve body 5-1 to discharge the water or block the water flow. The connection part 5-6 is formed at an upper end of the valve body 5-1 for the operations of the valve body 5-1, the supporting die 5-9, and the ball 5-12 connected to the supporting die.

The supporting die 5-9 includes a protrusion part 5-10 formed at a side for dispersing the flowing direction of the water discharged from the outlet 5-5, the protrusion part being in the shape of wedge at a remote part from the outlet 5-5 to prevent the leakage of the water toward the supporting die 5-9 while dispersing the water flow, and a gear type water level control die 5-11 formed at the other end to be coupled with the ball 5-12 for controlling water level. Further, the supporting die 5-9 includes a supporting die float 5-17 for preventing the water leakage. The supporting die 5-9 may open the valve 5-8 under a low pressure if the ball 5-12 is deviated from the supporting die 5-9. At this time, the supporting die float 5-17 lifts the supporting die 5-9 up to close the valve 5-8.

The ball 5-12 is filled with water 4-11 inside. The ball 5-12 includes a buoyancy part 5-13 at an upper end for floating on the water to control water level, and a water level controller 5-14 connected to the water level control die 5-11 of the supporting die 5-9 at a predetermined position for controlling the water level. If the water level rises up, the valve 5-8 may float on the water by buoyancy parts 5-13, wherein the valve 5-8 is not applied with any stress or fatigue in the above structure, differently from prior art brass valves.

If the user uses the water so that the water level becomes lowered, gravity is generated as much as the water level decrease. Further, the water pressure becomes high, so that the water is not discharged by the internal water pressure even though the water level becomes lowered even slightly. If the water level becomes lowered continuously and the ball 5-12 is exposed, the gravity exposing the ball makes the connection part serve as a point of action and the valve 5-8 is applied with a force by leverage via the supporting die 5-9. If the ball 5-12 is exposed and the internal water pressure exceeds the force of the spring 5-15, the supporting die 5-9 pushes the valve 5-8 out and water flows out via the outlet 5-5 along a gap between the pushed valve 5-8 and the valve contact part 5-4.

To the contrary, if the water level rises up, the ball 5-12 is sunk in the water though the opposite procedures to the above, wherein the sunken part of the ball 5-12 has no influence on the supporting die 5-9. The supporting die 5-9 connected to the ball 5-12 rises up to the water surface by the air filled in the buoyancy parts 5-13, and moves to a rear part of the valve 5-8 via the connection part 5-6. The valve 5-8 comes out as much as the supporting die 5-9 is pushed by the influence of the spring 5-15, a flow rate of the inlet, and the water pressure. The valve 5-8 contacts the valve contact part 5-4 at a high water level, thereby blocking the water flow.

The supporting die float 5-17 makes the supporting die 5-9 lift in association with the rising of the water level for blocking the valve 5-8, if" the ball 5-12 is deviated away and the water leakage is generated.

On the other hand, two or more of the above valves are mounted in the present invention, wherein the discharge amount may be increased by increasing the number of the valves .

Embodiment 1. Structure for reducing the length of a body part by removing a hinge

Referring to Fig. 6a and Fig. 6b, the supporting die 5-9 is inserted into the valve body 5-1, and the slant beginning part 5-19 of the supporting die has a predetermined inclination angle. As the ball 5-12 is exposed to the outside of the water in response to the lowering of the water level and applies a weight, a predetermined gravity is applied to the ball and the valve 5-8 is pushed by a force corresponding to the gravity, thereby making the water outflow.

The valve 5-8 is opened maximally by the internal water pressure if the spring 5-15 is pushed, so that the water flows out via the outlet 5-5. To the contrary, if the amount of the water is increased, the buoyancy parts 5-13 lifts by the •buoyancy and the valve 5-8 is closed.

Embodiment 2 . Application to a toilet

Referring to Fig. 7, the internal structure of a valve applied to a toilet is equal to that of the float valve of the present invention.

A valve body 6-1 is formed with a spiral part 6-2 to be connected to a pipe, and a net 6-7 is fixed to the body part

6-1 in the body part for filtering impurities. A check valve 6-17 is mounted on the net 6-7 for preventing the backflow of the water when the water supply is shut off.

A valve 6-8 perpendicular to an inlet is blocked at a rear part. A spring 6-15 pushes the valve 6-8 toward an outlet

6-5 and valve rails 6-3 keeps the valve 6-8 in position without deviation, so that the valve 6-8 contacts a valve contact part

6-4 under the low pressure so as to prevent the water leakage.

The supporting die 6-9 having a connection part 6-6 as a point of action, is integrally formed with buoyancy parts 6-13. If a ball 6-12 is sunk in the water, no gravity is generated and the valve 6-8 is kept to be closed. If the water level is lowered and the ball 6-12 is exposed to the outside of the water, gravity is generated and the supporting die 6-9 is inclined with respect to a hinge of the connection part. Then, the valve 6-8 is pushed away and the water flows out. If the toilet is filled with water by the outflow water, the ball 6-12 is lifted by the buoyancy of the buoyancy parts 6-13. At this time, the valve 6-8 contacts the valve contact part 6-4 again by the elasticity of the spring 6-15 positioned in the valve 6-8, thereby blocking the water flow.

A desired water level is controlled to a set position by repeating the above operations. The user may control the water level as desired by means of the water level control dies 6-11, 6-14. Symbols 6-10 and 6-16, which are not described herein, respectively represent a protrusion part and a supporting die float.

Embodiment 3. Powerless dual water level

As shown in Fig. 8a and Fig. 8b, a valve body 5-1 is integrated with valve rails 5-3, a net 5-7, and a spring 5-15.

A valve contact part 5-4 closely contacts the valve 5-8 by the force of the spring 5-15 for preventing the water leakage.

A connection part 5-6 is connected to a supporting die 5-9.

The valve body 5-1 is provided with an on-off switch 7-17 for opening or closing the valve 5-8.

Therefore, the supporting die 5-9 is connected to a buoyancy ball 7-11 and the buoyancy ball 7-11 is connected to a strip or rod type low water level supporting die 7-13 at a lower part. A gravity ball 7-12 is mounted under the low water level supporting die.

The gravity ball 7-12 is preferably sunk in the water but may float on the water, wherein the gravity ball 7-12 has to generate gravity when the gravity ball 7-12 is lowered in response to the water flow.

A high water level control part 7-16 is fixed to a pipe connection part or a certain position to control a high water level according to a water level desired by a user.

When the water is full, the switch 7-17 keeps the closed state of the valve. As the water level is lowered, the gravity ball 7-12 is exposed to the outside of the water and the exposed ball 7-12 is lowered by own weight, wherein the connection part 5-6 serves as a hinge. The connection part 5-6 is connected to the supporting die 5-9 via the buoyancy ball 7-11 connected to the low water level-supporting die 7-13. As the gravity ball 7-12 is lowered, the switch 7-17 is lowered to its off position and opens the valve 5-8, wherein this state is kept continuously.

Once the valve 5-8 is opened, the valve 5-8 is not closed since the switch 7-17 is fixed. At this time, the water begins to flow out and the gravity ball 7-12 is not in operation. As the water level is increased and the water contacts the buoyancy ball 7-11, buoyancy is generated to the buoyancy ball 7-11. If the generated buoyancy becomes bigger than the force of the switch, which is in the off state, the supporting die 5-9 serves as a point of action to turn on the switch 7-17. As the switch 7-17 is lifted to its on position, the valve 5-9 is closed and the water flow is prevented even though the water is continuously used.

The water flows again via the outlet 5.-5 when the valve 5-8 is opened by the gravity generated by the gravity ball 7-12.

In order to resolve the disadvantages to control the two balls, the buoyancy element and the gravity element may be added in a single ball.

The buoyancy ball 7-11 and the gravity ball 7-12 are respectively divided by half into two parts, wherein one is filled with water or heavy substances and the other is filled with air. The air-filled parts should have buoyancy and gravity enough to operate the on-off switch 7-17 respectively.

If the water level rises up, the valve 5-8 is closed by lifting the supporting die 5-9. If the water level is lowered, the gravity is generated to keep the switch 7-17 in the off state .

The on-off switch 7-17 of the present invention is formed by various methods .

^"According to one of the simplest methods, two magnets 7-19 are attached to the valve body 5-1 which contacts the supporting die 5-9, and a steel plate 7-20 is attached to the supporting die.

In the above structure, if the supporting die 5-9 is lowered and fixed at a lower part, the valve 5-9 is opened to discharge water continuously. If the supporting die is lifted by the buoyancy and fixed at an upper part, the valve

5-8 is closed.

In addition to the above method, a plate spring may be employed to obtain desired effects.

In the valves, the balls are in the structure to have air when water is not received in the balls.

In the case of the float valve and the valve for the toilet, water cannot be received in the ball in some cases. At this time, the inside of the ball is empty to generate the buoyancy when the ball is sunk in the water. If the lower part of the ball is opened to have air, both of the buoyancy and the gravity can be generated. If the outside of the ball is closed but the air is received in the ball, the specific gravity of the ball is controlled less than 1 for moving the ball up and down.

While the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that various modifications and substitutions can be made thereto without departing from the spirit and scope of the present invention as set forth in the appended claims .

INDUSTRIAL APPLICABILITY Therefore, according to the present invention, more than one outlet are formed and the water level is controlled dually, so that the water level control is simplified and the water saving effect may be obtained. The automatic water level control device of the present invention may be formed of a synthetic resin, so that the environmental problems may be reduced and the application for various chemicals is simplified. Further, the present invention may be manufactured with a large diameter.

The automatic water level control device of the present invention is applicable to toilets, water purifiers, vending machines and the like by changing the direction of an inlet. Further, the water level may be controlled dually without any power by mounting an on-off switch and providing a gravity element and a buoyancy element.

Claims

What is claimed is :

1. An automatic water level control device with a float valve using internal water pressure, gravity and buoyancy, comprising: a valve body having a spiral part at a side to be connected to a pipe, and a cylindrical connection part to be connected to the spiral part; a valve inserted into the valve body apart from the inner surface of the valve body; a net provided to an end of the valve body for filtering impurities, which deteriorates the operation of the valve; a spring mounted between the valve and the net for protecting the valve under a low pressure and keeping the precision of valve operations by forcibly pushing the valve when a water level becomes high; a supporting die connected to the valve body for transmitting the gravity of a ball to the valve by leverage to control the valve; and the ball mounted to the supporting die for generating gravity when the water level becomes lowered so as to open the valve.

2. The automatic water level control device as claimed in claim 1, wherein the valve body is provided with valve rails on an inner peripheral surface to operate the valve apart from the valve body, a outlet for discharging water flowing^'between the valve and the valve body, and a valve contact part on a ground surface of the outlet for making the valve contact the valve body to flow the water or block the water flow.

3. The automatic water level control device as claimed in claim 1, wherein the supporting die includes a protrusion part formed at a side for dispersing the flowing direction of the water discharged from the outlet, the protrusion part being in the shape of wedge at a remote part from the outlet to prevent the leakage of the water toward the supporting die while dispersing the water flow, a gear type water level control die formed at the other end, and a supporting die float provided to a front surface to prevent the water leakage caused by the opening of the valve by means of own force of the supporting die.

4. The automatic water level control device as claimed in claim 1, wherein the supporting die is inserted into the valve body and includes a slant-beginning part at a side to open or close the valve in association with upward or downward sliding of the supporting die.

5. The automatic water level control device as claimed in claim 1, wherein an on-off switch is respectively mounted to the connection part of the valve body and supporting die to control dual water levels powerlessly.

6. The automatic water level control device as claimed in claim 5, wherein the on-off switch includes a plurality of magnets attached to a portion that the valve body contacts the supporting die, and a steel plate attached to the supporting die, so that the on-off switch is fixed to a lower part for opening the valve to discharge the water continuously when the supporting die is lowered and the on-off switch is fixed to an upper part by the buoyancy for closing the valve.