Buoy device and method for controlling the timely fall of the buoy, as well as the inlet valve and drain valve

Abstract

The present invention discloses a buoy device, a method for controlling the timely falling of the buoy, a water inlet valve and a drain valve. The buoy device includes a buoy seat, a one-way switch and a buoy located in the buoy seat. A drain port is provided at the lower end of the buoy seat. The one-way switch is movably installed at the drain port, and the drain port is closed when the one-way switch floats in place. The one-way switch is provided with a water storage cavity, a water inlet structure communicating the water storage cavity with the inner cavity of the buoy seat, and a drain structure capable of draining the water storage cavity. After the buoy seat is filled with water, a part of the water in the buoy seat enters the water storage cavity through the water inlet structure until the one-way switch opens the drain port of the buoy seat. The present invention enables the buoy to fall in time as the water level in the water tank drops, ensuring that the components linked to the buoy can act in time, so as to ensure that the drain valve applying the buoy device can stop water in time, achieving the purpose of water saving.

Description

Technical Field

[0001] The present invention relates to the field of sanitary ware, and particularly to a buoy device, a method for controlling the buoy to fall in time, a water inlet valve and a drain valve. Background Art

[0002] In toilet water fittings, the lifting of a buoy is often used to drive the movement of a mechanism. For example, the buoy of the water inlet valve controls the opening and closing of the water inlet passage of the water inlet valve through lifting, and the buoy of the drain valve drives the valve plate to open through rising. In order to enable the buoy to quickly move into place, the buoy is usually placed in a buoy seat (or called an outer buoy). When the water level in the water tank rises above the buoy seat, it will pour into the buoy seat and lift the buoy in the buoy seat all at once. In order to ensure that the buoy can fall after the water level drops, a one-way switch is usually provided at the lower end of the buoy seat. When the water level rises, the one-way switch closes the drain port at the lower end of the buoy seat, and water cannot enter the buoy seat from the bottom of the buoy seat, and can only pour in from above the buoy seat; when the water level drops to a certain extent, the one-way switch opens the drain port of the buoy seat, and water flows out of the buoy seat from the bottom of the buoy seat, causing the buoy to drop. The above structure is usually as Figure 1 shown. The one-way switch 3' is a float that rises under the buoyancy in water, and its upper surface is in close contact with the lower surface of the buoy seat 2' to form a seal, and water cannot enter from the drain port at the bottom of the buoy seat 2'; after the water level outside the buoy seat 2' drops to a certain extent, the pressure generated by the water level difference inside and outside is greater than the buoyancy of the one-way switch 3', the one-way switch 3' opens, and water flows out from the hole at the bottom of the buoy seat 2', causing the buoy 1' to fall.

[0003] However, the above structure has the following problems. To make the pressure generated by the water level difference inside and outside the buoy seat greater than the buoyancy of the one-way switch, the water level in the water tank has to drop to a very low position. Before the water level in the water tank drops low enough, the buoy will not fall at all. The non-falling of the buoy will cause the components linked to it to not act in time. Taking the example of the buoy rising to drive the drain valve flap to open, if the buoy cannot drop in time, then the drain valve flap cannot close in time under the traction of the buoy, resulting in the drainage volume exceeding the actual requirement. In the existing structure, in order to ensure that the one-way switch is reliably closed when the water level rises, the buoyancy of the one-way switch is set relatively large, so that the water level often has to drop below the one-way switch before the buoy can fall, making the above problem more serious. Summary of the Invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a buoy device, a method for controlling the buoy to fall in time, a water inlet valve and a drain valve, which can realize the timely falling of the buoy and ensure the timely action of the components linked to the buoy.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: a buoy device. After the buoy seat is filled with water, part of the water in the buoy seat enters the water storage cavity from the water inlet structure until the one-way switch opens the drain port of the buoy seat.

[0006] Further, the drainage structure is a throttle hole provided in the one-way switch and communicating with the water storage cavity. Before the buoy seat is filled with water or before the water in the buoy seat enters the water storage cavity, the water storage cavity of the one-way switch is not filled with water.

[0007] Further, the throttle hole is located at the lower end face of the one-way switch, or the throttle hole is located at the bottom of the side wall of the one-way switch.

[0008] Further, the drainage structure includes a water outlet provided at the lower end of the one-way switch and a one-way valve movably installed at the water outlet. When the one-way valve floats in place, it closes the water outlet, and when it falls, it opens the water outlet.

[0009] Further, the water inlet structure is a water inlet provided at the upper end of the one-way switch, and the water inlet corresponds to the drain port up and down.

[0010] Further, an opening is provided at the upper end of the buoy seat to avoid the buoy and for water inlet; a water stop flange surrounding the drain port is provided at the lower end of the buoy seat. When the one-way switch floats in place, its upper end abuts against the water stop flange; a number of buckles are provided at intervals at the upper end of the one-way switch, and each buckle passes upward through the drain port and is stuck on the upper edge of the drain port, making the one-way switch hang upside down.

[0011] The present invention further provides a method for controlling the buoy to fall in time. The buoy is located in the buoy seat. A drain port is provided at the lower end of the buoy seat, and a one-way switch is movably installed at the drain port. The one-way switch closes the drain port when it floats in place; a water storage cavity is provided in the one-way switch. After the buoy seat is filled with water, part of the water in the buoy seat enters the water storage cavity of the one-way switch until the one-way switch opens the drain port of the buoy seat.

[0012] Further, a drainage structure capable of draining the water storage cavity is provided on the one-way switch. The drainage structure is a throttle hole provided in the one-way switch and communicating with the water storage cavity. Before the buoy seat is filled with water or before the water in the buoy seat enters the water storage cavity, the water storage cavity of the one-way switch is not filled with water.

[0013] Further, a water inlet structure communicating the water storage cavity and the inner cavity of the buoy seat is provided on the one-way switch. The water inlet structure is a water inlet provided at the upper end of the one-way switch, and the water inlet corresponds to the drain port up and down.

[0014] The present invention further provides a water inlet valve, which includes a water inlet valve body and further includes the buoy device as described in the present invention above. The buoy is linked with the water inlet valve body through a linkage component to control whether the water inlet valve body intakes water or not.

[0015] The present invention further provides a drain valve, which includes a flap and further includes the buoy device as described in the present invention above. The flap is connected to a drain switch through a connecting component and the buoy, so that when the drain switch is operated, the buoy is pulled to float upward and the flap is linked to open.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Since the one-way switch is provided with the water storage cavity, after the float seat intakes water, part of the water in the float seat enters the water storage cavity from the water inlet structure until the one-way switch opens the drain port of the float seat. Therefore, as the water level in the water tank drops, the water level in the float seat can drop in time, enabling the buoy to fall in time, ensuring that the components linked with the buoy can act in time, and thus ensuring that the drain valve applying the buoy device can stop water in time, achieving the purpose of water conservation.

[0018] 2. The drain structure preferably adopts the throttle hole, which has a simple structure and does not require additional components. Moreover, it will not fill the water storage cavity of the one-way switch with water before the float seat intakes water, and can automatically drain the water in the water storage cavity of the one-way switch after the water level in the water tank drops, so as to prepare for the next normal operation of the one-way switch.

[0019] 3. The water inlet structure preferably adopts the water inlet, which has a simple structure and does not require additional components, and can directly replenish water to the water storage cavity of the one-way switch when the float seat intakes water.

[0020] The following further elaborates on the present invention in detail in conjunction with the drawings and embodiments; however, a buoy device of the present invention, a method for controlling the buoy to fall in time, a water inlet valve, and a drain valve of the present invention are not limited to the embodiments. Description of the Drawings

[0021] Figure 1 is a cross-sectional view of a buoy device in the prior art;

[0022] Figure 2 is an exploded schematic view of a buoy device of the present invention;

[0023] Figure 3 is a cross-sectional view of a buoy device of the present invention;

[0024] Figure 4 is a schematic diagram of the working state when a buoy device of the present invention is applied to a water tank Figure 1 ;

[0025] Figure 5Schematic diagram of the working state of the buoy device of the present invention when applied to a water tank Figure 2 ;

[0026] Figure 6 Schematic diagram of the working state of the buoy device of the present invention when applied to a water tank Figure 3 ;

[0027] Figure 7 Schematic diagram of the working state of the buoy device of the present invention when applied to a water tank Figure 4 ;

[0028] Figure 8 Schematic diagram of the working state of the buoy device of the present invention when applied to a water tank Figure 5 ;

[0029] Figure 9 Schematic diagram of the structure of the inlet valve / drain valve of the present invention. Detailed implementation manners

[0030] For the embodiments, please refer to Figures 2 - 8 As shown, a buoy device of the present invention is applied to a water tank, especially a toilet water tank, and includes a buoy seat 2, a one-way switch 3, and a buoy 1 located in the buoy seat 2 and capable of floating under the action of buoyancy. An opening 21 is provided at the upper end of the buoy seat 2 to avoid the buoy 1 and allow water in the water supply tank to enter the buoy seat 2; a drain port 22 is provided at the lower end of the buoy seat 2, and the one-way switch 3 is movably installed at the drain port 22, and the drain port 22 is closed when the one-way switch 3 floats to the in-place position; the one-way switch 3 is provided with a water storage cavity 33, a water inlet structure communicating the water storage cavity 33 and the inner cavity of the buoy seat 2, and a drain structure capable of draining the water storage cavity 33; after the buoy seat 2 is filled with water, the buoy 1 is under the action of buoyancy (if the buoy is not restricted by an external force to float at this time, the buoy can float), and part of the water in the buoy seat 2 enters the water storage cavity 33 from the water inlet structure, filling the water storage cavity 33, so that the one-way switch 3 opens the drain port 22 of the buoy seat. The one-way switch 3 is a float structure, and its density is the same as or close to the density of water.

[0031] In this embodiment, the drainage structure is a throttle hole 34 provided below the upper end of the one-way switch 3 and communicating with the water storage cavity 33. Before the float seat 2 is filled with water or before the water in the float seat 2 enters the water storage cavity 33, the water storage cavity 33 of the one-way switch 3 is not filled with water. Thus, after the water in the water tank submerges the throttle hole 34, the water slowly flows into the water storage cavity 33 of the one-way switch 3 from the throttle hole 34. However, the rising speed of the water level in the water storage cavity 33 of the one-way switch 3 is much lower than the rising speed of the external water level, so that the water storage cavity 33 of the one-way switch 3 cannot be filled with water before the external water level rises to flood the float seat 2. In other embodiments, the drainage structure includes a water outlet provided at the lower end of the one-way switch and a one-way valve movably installed at the water outlet. When the one-way valve floats in place, it closes the water outlet, and when it falls, it opens the water outlet. The one-way valve floats or falls according to the height of the water level in the water tank.

[0032] In this embodiment, the throttle hole 34 is specifically located on the lower end face of the one-way switch 3, but it is not limited thereto. In other embodiments, the throttle hole is located at the bottom of the side wall of the one-way switch and is as close as possible to the lower edge of the side wall of the one-way switch. Thus, the throttle hole 34 can empty or as much as possible empty the water in the water storage cavity 33 of the one-way switch 3.

[0033] In this embodiment, the water inlet structure is a water inlet 31 provided at the upper end of the one-way switch 3, and the water inlet 31 corresponds to the water outlet 22 up and down. In other embodiments, the water inlet structure includes a water inlet pipe, one end of which is connected to the water storage cavity of the one-way switch, and the other end is connected to the inner cavity of the float seat.

[0034] In this embodiment, a water stop flange 23 surrounding the water outlet 22 is provided at the lower end of the float seat 2. When the one-way switch 3 floats in place, its upper end abuts against the water stop flange 23, forming a sealed state for the water outlet 22 of the float seat 2, so that the water in the water tank will not enter the float seat 2 from the water outlet 22. A number of buckles 32 are provided at intervals at the upper end of the one-way switch 3. Each buckle 32 passes upward through the water outlet 22 and is stuck on the upper edge of the water outlet 22, making the one-way switch 3 in an inverted hanging state. The number of buckles 32 is specifically distributed at intervals along the circumference of the water inlet 31, and the number of buckles 32 is specifically four, but it is not limited thereto.

[0035] The working principle of a float device of the present invention is as follows:

[0036] Low water level state: The water level in the water tank 4 is relatively low, and the float 1 and the one-way switch 3 respectively fall to the limit position naturally, as Figure 4 shown;

[0037] Throttle hole 34 water inlet process:

[0038] (1) The water level in the water tank 4 rises above the height of the lower end of the one-way switch 3. The one-way switch 3 rises due to buoyancy, and its upper surface cooperates with the water-stop flange 23 on the lower end surface of the float seat 2 to form a seal. As shown in Figure 5 , the water in the water tank 4 cannot enter through the drain port 22 at the lower end of the float seat 2;

[0039] (2) Water slowly flows into the one-way switch 3 from the throttle hole 34 at the lower end of the one-way switch 3. As shown in Figure 5 , but the rising speed of the water level in the water storage cavity 33 of the one-way switch 3 is much lower than the rising speed of the water level in the water tank 4. Before the water level in the water tank 4 rises to the upper end of the float seat 2, the water storage cavity 33 of the one-way switch 3 cannot be filled with water;

[0040] Lifting process of the float 1:

[0041] (1) When the water level in the water tank 4 rises to overflow the upper end of the float seat 2, water surges into the float seat 2 and quickly lifts the float 1 (assuming that the float 1 is not subject to an external force restricting its upward movement at this time). As shown in Figure 6 ;

[0042] (2) The water in the float seat 2 flows into the water storage cavity 33 of the one-way switch 3 from top to bottom through the drain port 22 and the water inlet 31 in sequence, filling the water storage cavity 33 of the one-way switch 3 with water. Since the density of the material of the one-way switch 3 itself is similar to that of water, the one-way switch 3 changes from a floating state to a suspended state opening the drain port 22 of the float seat 2. As shown in Figure 6 ;

[0043] Falling process of the float 1:

[0044] (1) When the water level in the water tank 4 drops, since the one-way switch 3 is in a suspended state, it will not cause the drain port 22 at the lower end of the float seat 2 to be closed. Therefore, the water in the float seat 2 flows out through the drain port 22 at the lower end of the float seat 2, and the float 1 drops as the water level drops. As shown in Figure 7 ;

[0045] Drainage process of the one-way switch 3:

[0046] (1) When the water level in the water tank 4 drops below the one-way switch 3, the water in the float seat 2 is drained completely, and the float 1 drops completely. As shown in Figure 8 ;

[0047] (2) The water in the water storage cavity 33 of the one-way switch 3 flows out from the throttle hole 34. As shown in Figure 8 , and finally the water is drained completely and returns to the low water level state.

[0048] A buoy device of the present invention has a one-way switch 3 disposed in the water storage chamber 33 and the throttle orifice 34. When the water level rises, by the throttling effect of the throttle orifice 34, the one-way switch 3 maintains a floating state for a period of time, ensuring that the drain port 22 at the lower end of the buoy seat 2 is in a closed state. When the water level drops, water can flow away through the throttle orifice 34 and return to the emptied state. Therefore, the one-way switch 3 of the present invention realizes the one-way function that the drain port 22 of the buoy seat 2 does not admit water when the water level rises and the drain port 22 of the buoy seat 2 is opened in time for drainage when the water level drops. During the process of the water level rising, like the prior art, the present invention ensures that the buoy 1 does not rise with the water level at the beginning, and only rises suddenly after the water level submerges the buoy seat 2 (assuming that the buoy 1 is not subject to an external force restricting its upward floating); during the process of the water level dropping, the present invention can ensure that the buoy 1 drops in time following the drop of the water level, thus solving the lag problem existing in the prior art. In addition, the present invention also has the characteristics of simple overall structure, low cost, and convenient installation.

[0049] A method for controlling a buoy to drop in time according to the present invention, the buoy is located in a buoy seat, the buoy seat is located in a water tank, and a drain port is provided at the lower end of the buoy seat. The drain port is movably equipped with a one-way switch, and the one-way switch closes the drain port when floating in place; the one-way switch is provided with a water storage chamber. After the buoy seat is filled with water, the buoy is subjected to a buoyancy force, and a part of the water in the buoy seat enters the water storage chamber of the one-way switch until the one-way switch opens the drain port of the buoy seat; as the water level in the water tank drops, the water in the water storage chamber is discharged.

[0050] In this embodiment, a drainage structure capable of draining the water storage chamber is provided on the one-way switch. The drainage structure is a throttle orifice provided below the upper end of the one-way switch and communicating with the water storage chamber. Before the buoy seat is filled with water or before the water in the buoy seat enters the water storage chamber, the water storage chamber of the one-way switch is not filled with water. In other embodiments, the drainage structure includes a water outlet provided at the lower end of the one-way switch and a one-way valve movably installed at the water outlet. The one-way valve closes the water outlet when floating in place and opens the water outlet when dropping, and the one-way valve floats or drops according to the height of the water level in the water tank.

[0051] In this embodiment, a water inlet structure communicating the water storage chamber and the inner cavity of the buoy seat is provided on the one-way switch. The water inlet structure is a water inlet provided at the upper end of the one-way switch, and the water inlet corresponds to the drain port up and down. In other embodiments, the water inlet structure includes a water inlet pipe, one end of the water inlet pipe is connected to the water storage chamber of the one-way switch, and the other end is connected to the inner cavity of the buoy seat.

[0052] A method for controlling a buoy to drop in time according to the present invention can be realized by using a buoy device of the present invention as described above. Its specific working principle is as described above and will not be elaborated here.

[0053] Please refer to Figure 9 As shown, a water inlet valve of the present invention includes a water inlet valve body 5, and also includes the float device as described in the present invention above. The float 1 is linked with the water inlet valve body 5 through a linkage component to control whether the water inlet valve body 5 admits water or not. The linkage component can specifically be a lifting rod assembly 6, etc., which is prior art and will not be elaborated here.

[0054] In this embodiment, the float seat 2 can specifically be installed at a suitable height outside the water inlet valve body 5.

[0055] For a water inlet valve of the present invention, after adopting the float device, when the water level in the toilet tank 4 reaches the lowest level, the float 1 and the one-way switch 3 respectively fall naturally to the limit position. The float 1 drives the lifting rod assembly 6 to open the internal water path of the water inlet valve body 5, enabling water to enter the tank 4 to replenish the water in the tank 4. When the water level in the tank 4 rises and floods into the float seat 2, the float 1 quickly rises, thereby driving the lifting rod assembly 6 to promptly close the internal water path of the water inlet valve body 5, causing the water inlet valve body 5 to stop admitting water, achieving the purpose of water conservation. When the water level in the tank 4 drops, the water level in the float seat 2 drops in a timely manner, enabling the float 1 to fall in a timely manner, thereby driving the lifting rod assembly 6 to promptly open the internal water path of the water inlet valve body 5, causing the water inlet valve body 5 to start admitting water, thus avoiding the situation that the water inlet valve body 5 is affected in use due to the delayed falling of the float resulting in delayed water inlet.

[0056] Please refer to Figure 9 As shown, a drain valve of the present invention includes a flap 7, and also includes the float device as described in the present invention above. The flap 7 is connected to a drain switch (not shown in the figure) through a connecting component and the float 1, so that when the drain switch is operated (such as being pressed or toggled, etc.), the float 1 is pulled upward, and the flap 7 is linked to open.

[0057] In this embodiment, the connecting component is specifically a pull rope 8 (or it can also be a chain, etc.). It connects the float 1, and its lower end is connected to the flap 7, and its upper end is connected to the drain switch. When the float 1 is pulled upward by the drain switch, it can pull the flap 7 through the pull rope 8 to open the flap 7. The drain switch can be a push-button drain switch or a toggle drain switch, which is prior art and will not be elaborated here.

[0058] In this embodiment, the float seat 2 is sleeved on the overflow pipe 9 of the drain valve of the present invention and can be adjusted in height.

[0059] A drain valve of the present invention. Before the toilet tank 4 drains water, there is water in the float seat 2, and the one-way switch 3 is in a suspended state to open the drain port 22 of the float seat 2. At this time, the float 1 is pulled by the flap 7 and cannot float upward. When the drain switch is operated to start draining water, the float 1 is quickly lifted under the combined action of the upward pulling force and buoyancy force, and pulls the flap 7 through the pull rope 8 to quickly open the flap 7, so that the water in the tank 4 drains. When the water level in the tank 4 drops, since the one-way switch 3 is in a suspended state, it will not cause the drain port 22 at the lower end of the float seat 2 to be closed. Therefore, the water in the float seat 2 flows out through the drain port 22 at the lower end of the float seat 2, and the float 1 drops as the water level drops; when the water level in the tank 4 drops below the one-way switch 3, the water in the float seat 2 is drained out, and the float 1 drops completely, thereby driving the flap 7 to close in time to avoid the drainage volume exceeding the actual requirement.

[0060] A drain valve of the present invention, by setting the float device, can not only make the flap 7 close in time to achieve the purpose of water saving, but also utilize the buoyancy force received by the float 1 to reduce the upward pulling force on the pull rope 8, thereby reducing the operating force of the drain switch (i.e., the pressing force or other operating force).

[0061] A float device of the present invention, a method for controlling the float to fall in time, and a water inlet valve and a drain valve. The parts not involved are the same as those in the prior art or can be implemented by using the prior art.

[0062] The above embodiments are only used to further illustrate a float device of the present invention, a method for controlling the float to fall in time, and a water inlet valve and a drain valve. However, the present invention is not limited to the embodiments. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention all fall within the protection scope of the technical solution of the present invention.

Claims

1. A buoy device, comprising a buoy seat, a one-way switch and a buoy located in the buoy seat. The lower end of the buoy seat is provided with a drain port, the one-way switch is movably installed at the drain port, and the drain port is closed when the one-way switch floats in place; Characterized in that: The one-way switch is provided with a water storage cavity, a water inlet structure connecting the water storage cavity and the inner cavity of the buoy seat, and a drainage structure capable of draining the water storage cavity; after the buoy seat is filled with water, part of the water in the buoy seat enters the water storage cavity through the water inlet structure until the one-way switch opens the drain port of the buoy seat.

2. The buoy device according to claim 1, Characterized in that: The drainage structure is a throttle hole provided in the one-way switch and communicating with the water storage cavity. Before the buoy seat is filled with water or before the water in the buoy seat enters the water storage cavity, the water storage cavity of the one-way switch is not filled with water.

3. The buoy device according to claim 2, Characterized in that: The throttle hole is located at the lower end face of the one-way switch, or the throttle hole is located at the bottom of the side wall of the one-way switch.

4. The buoy device according to claim 1, Characterized in that: The drainage structure includes a water outlet provided at the lower end of the one-way switch and a one-way valve movably installed at the water outlet. The water outlet is closed when the one-way valve floats in place and is opened when it falls.

5. The buoy device according to claim 1, Characterized in that: The water inlet structure is a water inlet provided at the upper end of the one-way switch, and the water inlet corresponds to the drain port up and down.

6. The buoy device according to claim 1, Characterized in that: The upper end of the buoy seat is provided with an opening to avoid the buoy and for water inlet; the lower end of the buoy seat is provided with a water stop flange surrounding the drain port. When the one-way switch floats in place, its upper end abuts against the water stop flange; the upper end of the one-way switch is provided with a number of spaced clips, and each clip passes upward through the drain port and is stuck on the upper edge of the drain port, so that the one-way switch is in an inverted hanging state.

7. A method for controlling the buoy to fall in time. The buoy is located in the buoy seat. The lower end of the buoy seat is provided with a drain port, and the drain port is movably equipped with a one-way switch. The drain port is closed when the one-way switch floats in place; Characterized in that: The one-way switch is provided with a water storage cavity. After the buoy seat is filled with water, part of the water in the buoy seat enters the water storage cavity of the one-way switch until the one-way switch opens the drain port of the buoy seat.

8. The method for controlling the buoy to fall in time according to claim 7, Characterized in that: A drainage structure capable of draining the water storage cavity is provided on the one-way switch. The drainage structure is a throttle hole provided in the one-way switch and communicating with the water storage cavity. Before the buoy seat is filled with water or before the water in the buoy seat enters the water storage cavity, the water storage cavity of the one-way switch is not filled with water.

9. The method for controlling the buoy to fall in time according to claim 7, Characterized in that: A water inlet structure connecting the water storage cavity and the inner cavity of the buoy seat is provided on the one-way switch. The water inlet structure is a water inlet provided at the upper end of the one-way switch, and the water inlet corresponds to the drain port up and down.

10. An inlet valve, comprising an inlet valve body, Characterized in that: It further includes a buoyancy device as described in any one of claims 1-6, and the buoyancy is linked with the main body of the water inlet valve through a linkage component to control whether the main body of the water inlet valve intakes water or not.

11. A drain valve, comprising a flap cover, Characterized in that: It further includes a buoyancy device as described in any one of claims 1-6. The flap cover is connected to a drain switch through a connecting component and the buoyancy, so that when the drain switch is operated, the buoyancy is pulled to float upward, and the flap cover is linked to open.

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