A water tank level control device and method, a water tank device and a sanitary washing device

Abstract

The application discloses a water tank liquid level control device and method, a water tank device and a sanitary cleaning device. The water tank liquid level control device comprises a water tank, a water inlet, a water outlet and an exhaust hole; a floating body and a pressure detector for detecting the internal pressure of the water tank; the floating body is located in the water tank and floats up with the rising of the liquid level in the water tank; the floating body limits the exhaust of the gas in the water tank from the exhaust hole when floating to the highest position; and when the internal pressure of the water tank increases to be greater than or equal to a first preset value, the pressure detector outputs a pressure signal for controlling the water tank to stop water inflow. The application adopts the floating body to control whether the water tank exhausts during water inflow; and when the exhaust hole does not exhaust, the pressure detector detects the increase of the internal pressure of the water tank and outputs a pressure signal for controlling the water tank to stop water inflow. Therefore, the pressure detector of the application does not need to contact with the liquid, the sealing requirement is low, the cost is reduced, and the service life of the pressure detector is prolonged.

Description

Technical Field

[0001] This invention relates to the field of sanitary ware, and in particular to a water tank level control device and method, a water tank device, and a sanitary cleaning device. Background Technology

[0002] Currently, most smart toilets are equipped with a sanitary cleaning device for users to wash their buttocks and / or genitals after using the toilet. Traditional sanitary cleaning devices generally include a spray nozzle and a heater, and use a pressure regulating valve to stabilize the municipal water supply to achieve stable water pressure. However, in reality, this expectation is not met because many uncontrollable factors such as the location and height of the municipal water supply often cause water pressure fluctuations. These fluctuations can easily cause the temperature of the water output from the sanitary cleaning device to fluctuate, seriously affecting the user experience. To address this, existing technology has developed a sanitary cleaning device with a water tank. This device uses the tank to store cleaning water, achieving an internal active water supply mode, thereby eliminating the influence of external pipeline water pressure fluctuations and improving the user experience. The above-mentioned water tank level is mainly determined by a level float installed in the tank in conjunction with a reed switch or by using a water level sensor to detect the water level in the tank. However, whether using a level float with a reed switch or using a water level sensor as the water tank level detector, there are the following shortcomings: such level detectors must be in contact with the liquid, requiring high sealing performance, resulting in high costs. Summary of the Invention

[0003] This invention addresses the technical problems existing in the prior art by providing a water tank level control device and method, a water tank device, and a sanitary cleaning device. It controls whether the water tank stops filling by detecting changes in the pressure inside the water tank. The live parts do not need to come into contact with the liquid, which can reduce the sealing requirements.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a water tank level control device, including a water tank, which is provided with an inlet, an outlet and an exhaust port; it also includes a float and a pressure detector for detecting the internal pressure of the water tank. The float is located inside the water tank. The float rises as the liquid level in the water tank rises, and when it rises to the highest position, it restricts the gas in the water tank from being discharged from the exhaust port. When the pressure in the water tank increases to a value greater than or equal to a first preset value, the pressure detector outputs a pressure signal to control the water tank to stop water intake.

[0005] Furthermore, it also includes a pressure relief component, which is disposed in the water tank to relieve pressure in the water tank when the pressure in the water tank continues to increase to a level greater than or equal to a second preset value. The pressure relief component is located inside the water tank and has a first through hole and a second through hole connecting the vent hole and the inner cavity of the water tank. The second through hole is higher than the first through hole. When the float rises to its highest position, the float blocks the first through hole and the second through hole is closed. As the pressure in the water tank continues to increase, the second through hole opens to relieve pressure.

[0006] Furthermore, the pressure relief assembly includes a hollow first guide member, a hollow second guide member, and a reset component. The first guide member has a first through hole, and the second guide member has a second through hole. The second guide member is disposed inside the water tank, and the first guide member is movably fitted onto the second guide member. The float is located in the first guide member. Before the pressure inside the water tank continues to increase, the first guide member is in its lowest position under the action of the reset component, and the second through hole is closed. As the pressure inside the water tank continues to increase, the first guide member moves upward under the action of the pressure inside the water tank, and the second through hole is opened.

[0007] Furthermore, the second through hole is provided on the side wall of the second guide member, and the side wall of the first guide member is provided with a third through hole. When the third through hole is misaligned with the second through hole, the second through hole is in a closed state. When the third through hole is aligned with the second through hole, the second through hole is in an open state. The first guide member is fitted with a sealing gasket that is higher than the third through hole. When the third through hole is misaligned with the second through hole, the sealing gasket blocks the second through hole.

[0008] Furthermore, the first guide member is partially sleeved inside the second guide member, and the reset component is a spring. The spring is sleeved on the first guide member, and its upper end abuts against the first limiting part provided by the second guide member or the water tank, and its lower end abuts against the second limiting part provided by the first guide member.

[0009] Furthermore, the first guide member is vertically continuous, the first through hole is located in the first guide member, and the side wall of the first guide member is provided with a fourth through hole that connects the first through hole and the inner cavity of the water tank and is lower than the second through hole. The upper edge of the fourth through hole is higher than the preset highest liquid level of the water tank; the second guide member is vertically continuous, and its upper opening is connected to the vent hole.

[0010] Furthermore, the pressure detector is installed on the top of the water tank and is above the preset maximum liquid level of the water tank; the pressure detector is a pressure sensor.

[0011] The present invention also provides a water tank level control method, wherein the water tank is provided with an inlet, an outlet and a vent; a float is provided in the water tank so that the float rises as the water level in the tank rises, and when it rises to the highest position, it restricts the gas in the water tank from being discharged from the vent; and when the pressure in the water tank is detected to increase to a value greater than or equal to a first preset value, the water tank is controlled to stop water intake, or a signal is output to control the water tank to stop water intake.

[0012] Furthermore, a pressure relief component is provided to relieve pressure in the water tank when the pressure inside the tank continuously increases to a level greater than or equal to a second preset value. The pressure relief component is located inside the water tank and has a first through hole and a second through hole connecting the vent hole and the inner cavity of the water tank. The second through hole is higher than the first through hole. When the float rises to its highest position, the float blocks the first through hole, and the second through hole is closed. As the pressure inside the water tank continues to increase, the second through hole opens to relieve pressure.

[0013] Furthermore, the pressure relief assembly includes a hollow first guide member, a hollow second guide member, and a reset component. The first guide member has a first through hole, and the second guide member has a second through hole. The second guide member is disposed inside the water tank, and the first guide member is movably fitted onto the second guide member. The float is located in the first guide member. Before the pressure inside the water tank continues to increase, the first guide member is in its lowest position under the action of the reset component, and the second through hole is closed. As the pressure inside the water tank continues to increase, the first guide member moves upward under the action of the pressure inside the water tank, and the second through hole is opened.

[0014] The present invention also provides a water tank device, including an inlet valve, a controller, and a water tank level control device as described above. The outlet end of the inlet valve is connected to the inlet of the water tank. The pressure detector and the inlet valve are electrically connected to the controller. When the controller receives a pressure signal generated by the pressure detector, it controls the inlet valve to close in a timely manner or with a delay. When the pressure signal from the pressure detector disappears, the controller controls the inlet valve to open in a timely manner or with a delay.

[0015] The present invention also provides a sanitary cleaning device for posterior washing and / or feminine washing, comprising the water tank device as described above.

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

[0017] 1. The present invention uses the float to control whether the water tank vents air during the water intake process. When the vent is not venting air, a pressure detector is used to detect the increase in pressure inside the water tank and output a pressure signal to control the water tank to stop water intake. Therefore, the live parts (i.e., pressure detectors) of the present invention do not need to be in contact with the liquid, and the sealing requirements are low, which reduces costs and also helps to extend the service life of the pressure detector.

[0018] 2. The present invention further includes the pressure relief component, which can automatically relieve pressure when the pressure in the water tank exceeds a certain value, thereby improving the safety of the water tank. In particular, the pressure relief component is provided with the first through hole and the second through hole, so that the water tank only needs to be provided with one vent hole to achieve liquid level control and pressure relief together with the float and the pressure relief component, without the need to provide multiple vent holes.

[0019] 3. The pressure relief device preferably includes the first guide member, the second guide member, and the reset component. It is ingeniously designed, simple, and easy to install. It can effectively guide the float, making the stability and reliability of the invention better.

[0020] 4. The third through hole simplifies the fit between the first guide and the second guide, making installation easier.

[0021] 5. The reset component is preferably a spring, which has a simple structure and is easy to install.

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the water tank level control device and method, water tank device and sanitary cleaning device of the present invention are not limited to the embodiments. Attached Figure Description

[0023] Figure 1 This is an exploded view of the water tank level control device of the present invention;

[0024] Figure 2 This is a cross-sectional view of the water tank of the present invention;

[0025] Figure 3 This is a cross-sectional view of the float and pressure relief assembly of the present invention in an assembled state;

[0026] Figure 4 This is a three-dimensional structural schematic diagram of the water tank level control device of the present invention;

[0027] Figure 5 This is a cross-sectional view of the water tank level control device of the present invention in the water inlet state. Figure 1 ;

[0028] Figure 6 This is a cross-sectional view of the water tank level control device of the present invention in the water inlet state. Figure 2 ;

[0029] Figure 7 This is a cross-sectional view of the water tank level control device of the present invention in the water inlet state. Figure 3 ;

[0030] Figure 8 This is a schematic block diagram of the water tank device of the present invention;

[0031] Figure 9This is a schematic diagram of the water inlet process of the water tank device of the present invention;

[0032] Among them, 1. Water tank, 11. Vent hole, 2. Float, 3. First guide, 31. First through hole, 32. Third through hole, 33. Fourth through hole, 34. Annular flange, 35. Second annular plate; 4. Second guide, 41. Second through hole, 42. First annular plate, 43. Inner flange; 5. Spring, 6. Sealing gasket, 7. Pressure sensor, 8. Inlet valve, 9. Controller. Detailed Implementation

[0033] For an example, please refer to [link / reference]. Figures 1-7 As shown, a water tank level control device of the present invention includes a water tank 1, which has an inlet, an outlet, and a vent 11 located at the top of the water tank 1. The invention also includes a float 2 and a pressure detector for detecting the internal pressure of the water tank 1. The float 2 is located inside the water tank 1 and rises with the increase of the liquid level in the water tank 1. When it reaches its highest position, the float 2 restricts the gas in the water tank 1 from escaping through the vent 11. When the pressure inside the water tank 1 increases to a value greater than or equal to a first preset value, the pressure detector outputs a pressure signal to stop the water tank 1 from receiving water. The pressure detector is installed at the top of the water tank 1 and is above the preset highest liquid level of the water tank 1. Figure 2 As shown, the pressure detector is specifically a pressure sensor 7.

[0034] In this embodiment, the present invention further includes a pressure relief component disposed in the water tank 1 to relieve pressure in the water tank 1 when the pressure inside the water tank 1 continuously increases to a value greater than or equal to a second preset value. Specifically, the pressure relief component is disposed inside the water tank 1 and has a first through hole 31 and a second through hole 41 connecting the vent 11 and the inner cavity of the water tank 1. The second through hole 41 is higher than the first through hole 31. When the float 2 rises to its highest position, the float 2 blocks the first through hole 31, and the second through hole 41 is in a closed state. As the pressure inside the water tank 1 continues to increase, the second through hole 41 opens to relieve pressure.

[0035] In this embodiment, the pressure relief assembly includes a hollow first guide member 3, a hollow second guide member 4, and a reset component. The first guide member 3 has a first through hole 31, and the second guide member 4 has a second through hole 41. The second guide member 4 is disposed inside the water tank 1. The first guide member 3 is movably fitted onto the second guide member 4, and the float 2 is located within the first guide member 3. Before the pressure inside the water tank 1 continuously increases, the first guide member 3 is in its lowest position under the action of the reset component, and the second through hole 41 is closed. As the pressure inside the water tank 1 continues to increase, the first guide member 3 moves upward under pressure and opens the second through hole 41. In other embodiments, the pressure relief assembly includes a guide member with a first through hole and a second through hole. The float is located within the guide member. The guide member has a one-way valve at its second through hole. When the pressure inside the water tank is lower than the preset value, the one-way valve closes the second through hole. When the pressure inside the water tank continuously increases to a value higher than the preset value, the one-way valve opens the second through hole under pressure.

[0036] In this embodiment, the second through hole 41 is provided on the side wall of the second guide member 4, and the side wall of the first guide member 3 is provided with a third through hole 32. When the third through hole 32 and the second through hole 41 are misaligned, the second through hole 41 is in a closed state. When the third through hole 32 and the second through hole 41 are aligned, the second through hole 41 is in an open state. The first guide member 3 is fitted with a sealing gasket 6 that is higher than the third through hole 32. When the third through hole 32 and the second through hole 41 are misaligned, the sealing gasket 6 blocks the second through hole 41 to improve the sealing performance of the second through hole 41 in the closed state.

[0037] In this embodiment, the first guide member 3 is partially sleeved within the second guide member 4. The reset component is a spring 5, which is sleeved within the first guide member 3, with its upper end abutting against the first limiting part of the second guide member 4 or the water tank 1, and its lower end abutting against the second limiting part of the first guide member 3. The third through hole 32 is located within the second guide member 4, and the sealing gasket 6 is sleeved on the upper part of the first guide member 3. The first limiting part is specifically an annular flange 34 provided in the first guide member 3, the inner ring of which forms the first through hole 31. The second limiting part is specifically a first annular piece 42 provided at the top of the second guide member 4, the inner ring of which forms the upper opening of the second guide member 4, which connects to the vent hole 11. Specifically, the upper end of the second guide member 4 is sealed and sleeved within the vent hole 11. In other embodiments, the reset component is a magnetic repulsion assembly, specifically including a first magnet and a second magnet. The first magnet is disposed on the first guide member, and the second magnet is disposed on the second guide member or the top surface inside the water tank. The same magnetic poles of the first and second magnets are vertically opposite each other, so that when the first and second magnets approach each other, a force is generated that causes the first guide member to reset upward. In other embodiments, the reset component includes the spring and the magnetic repulsion assembly.

[0038] In this embodiment, the first guide member 3 and the second guide member 4 are cylindrical structures that extend vertically through each other. The first through hole 31 and the float 2 are located in the first guide member 3. The upper part of the first guide member 3 is fitted inside the second guide member 4, and the second guide member 4 is provided with a limiting structure to prevent the first guide member 3 from disengaging from the second guide member 4. Specifically, the limiting structure is an inner flange 43 provided at the bottom end of the second guide member 4. The outer diameter of the first guide member 3 is larger at the top and smaller at the bottom. Therefore, the upper part of the first guide member 3 is limited within the second guide member 4 by the inner flange of the second guide member 4. To facilitate the insertion of the upper part of the first guide member 3 into the second guide member 4, the second guide member 4 can be configured to be fixedly connected by at least two separate small parts (e.g., by welding), and the upper part of the first guide member 3 is inserted first, and then the assembly and fixation of the second guide member 4 are completed. Similarly, to facilitate the insertion of the float 2 into the first guide member 3, the first guide member 3 can also be configured to be fixedly connected by at least two separate small parts, and the float 2 is inserted first, and then the assembly and fixation of the first guide member 3 are completed.

[0039] In this embodiment, the first through hole 31 is located in the first guide member 3. The side wall of the first guide member 3 is provided with a fourth through hole 33 that connects the first through hole 31 and the inner cavity of the water tank 1 and is lower than the second through hole 41. The upper edge of the fourth through hole 33 is higher than the preset maximum liquid level of the water tank 1. Specifically, the fourth through hole 33 is provided on the side wall of the part of the first guide member 3 outside the second guide member 4 (i.e., the lower part of the first guide member 3). The preset maximum liquid level of the water tank 1 refers to the highest water level reached inside the water tank 1 under normal working conditions.

[0040] In this embodiment, the float 2 can be a float, a float ball, or a float cylinder, etc., with a gap between its outer surface and the inner surface of the first guide member 3, allowing the float 2 to float or sink freely. Before the first through hole 31 is closed, it also allows the gas (i.e., air) in the water tank 1 to flow sequentially through the fourth through hole 33, the gap between the float 2 and the first guide member 3, and towards the first through hole 31. A second annular plate 35 is provided at the lower end of the first guide member 3 to restrict the float 2 from detaching downwards.

[0041] The working principle of the water tank level control device of the present invention is as follows:

[0042] When the liquid level in water tank 1 is low, float 2 is below the first through hole 31, the first through hole 31 is open, the first guide 3 is in its lowest position, and its sealing gasket 6 blocks the second through hole 41 of the second guide 4. Figure 5 As shown. Therefore, as the liquid level in water tank 1 rises, the gas in water tank 1 is discharged from water tank 1 sequentially through the fourth through hole 33, the first through hole 31, and the vent hole 11, as shown. Figure 5 As shown in the figure, the arrows indicate the direction of gas flow.

[0043] When float 2 rises to its highest position, the first through hole 31 is blocked by float 2, such as Figure 6 As shown, at this time, the inner cavity of water tank 1 is in a closed state. If water continues to be added, the pressure inside water tank 1 will increase. When the pressure inside water tank 1 increases to a value greater than or equal to the first set value, the pressure sensor 7 detects the pressure increase and generates a pressure signal to the controller connected to it. The controller then controls the inlet valve connected to the inlet of water tank 1 to stop the water from entering. At this time, the water in water tank 1 reaches the preset maximum water level.

[0044] If the pressure sensor 7 or the controller malfunctions, causing the inlet valve to... Figure 6When water continues to be added to the water tank 1 in the indicated state, the pressure inside the water tank 1 will continue to increase. When the pressure inside the water tank 1 continues to increase to a value greater than or equal to the second preset value, the first guide member 3 will move upward against gravity and the elastic force of the spring 5 under the action of this pressure, and will be relatively displaced with the second guide member 4. When the first guide member 3 rises to a certain height, the second through hole 41 and the third through hole 32 will connect, allowing the gas or liquid inside the water tank 1 to be discharged outside the water tank 1 through the second through hole 41, the third through hole 32, and the vent hole 11 (e.g., Figure 7 As shown in the diagram (arrows indicate the direction of gas or liquid flow), this is used to achieve the purpose of depressurization.

[0045] After the water tank 1 stops filling with water at a high water level, the water level in the water tank 1 gradually decreases as water is pumped out, causing the pressure inside the water tank 1 to decrease. The pressure signal of the pressure sensor 7 disappears. After a period of time, the controller, which is electrically connected to the pressure sensor 7, restarts the water inlet valve to replenish water to the water tank 1.

[0046] This invention discloses a water tank level control device. The float 2 controls whether the vent 11 of the water tank 1 releases air. When the vent is not releasing air, a pressure detector (i.e., pressure sensor 7) detects the increase in pressure inside the water tank 1 and outputs a pressure signal to stop water intake into the water tank 1. Therefore, the live component (i.e., pressure sensor 7) of this invention does not need to contact the liquid, has low sealing requirements, reduces costs, and extends the service life of the pressure sensor 7. The pressure relief component enables automatic pressure relief when the pressure inside the water tank 1 exceeds a certain value, thereby improving the safety of the water tank 1. In particular, this invention achieves pressure relief and level control using the same vent 11, and the pressure relief component has a clever, simple, and easy-to-install structure, effectively guiding the float 2, thus improving the stability and reliability of the invention.

[0047] The present invention discloses a water tank level control method, wherein the water tank is provided with an inlet, an outlet and an exhaust vent; a float is provided in the water tank so that it floats as the water level in the tank rises, and when it floats to the highest position, it restricts the gas in the water tank from being discharged from the exhaust vent; and when the pressure in the water tank is detected to increase to a value greater than or equal to a first preset value, the water tank is controlled to stop water intake, or a signal is output to control the water tank to stop water intake.

[0048] In this embodiment, a pressure relief component is provided to relieve pressure in the water tank when the pressure inside the tank continuously increases to a level greater than or equal to a second preset value. The pressure relief component is located inside the water tank and has a first through hole and a second through hole connecting the vent hole and the inner cavity of the water tank. The second through hole is higher than the first through hole. When the float rises to its highest position, the float blocks the first through hole, and the second through hole is closed. As the pressure inside the water tank continues to increase, the second through hole opens to relieve pressure.

[0049] In this embodiment, the pressure relief assembly includes a hollow first guide member, a hollow second guide member, and a reset component. The first guide member has a first through hole, and the second guide member has a second through hole. The second guide member is disposed inside the water tank, and the first guide member is movably fitted onto the second guide member. The float is located within the first guide member. Before the pressure inside the water tank continuously increases, the first guide member is in its lowest position under the action of the reset component, closing the second through hole. As the pressure inside the water tank continues to increase, the first guide member moves upward under pressure, opening the second through hole. The reset component is an elastic element, but not limited to this; the elastic element rests between the first and second guide members, specifically a spring.

[0050] The water tank level control method of the present invention can be implemented by the water tank level control device of the present invention described above. Therefore, its detailed working principle is as described above and will not be repeated here.

[0051] A water tank device of the present invention includes an inlet valve 8, a controller 9, and a water tank level control device as described above. The outlet of the inlet valve 8 is connected to the inlet of the water tank 1. The pressure detector (i.e., pressure sensor 7) and the inlet valve 8 are electrically connected to the controller 9, respectively. Figure 8 As shown, when the controller 9 receives a pressure signal generated by the pressure detector (i.e., pressure sensor 7), it controls the inlet valve 8 to close promptly or with a delay. When the pressure signal from the pressure detector (i.e., pressure sensor 7) disappears, the controller 9 controls the inlet valve 8 to open promptly or with a delay. The inlet valve 8 is specifically a solenoid valve.

[0052] The water tank device of the present invention has the following detailed water inlet process: Figure 9 As shown: the inlet valve 8 is opened, and water tank 1 is filled with water; when the water level in water tank 1 reaches the preset height, water tank 1 is full of water, the pressure in water tank 1 increases, the pressure sensor 7 generates a pressure signal, and feeds it back to the controller 9; the controller 9 closes the inlet valve 8, and water tank 1 stops filling with water; as water is output from water tank 1, the water level in water tank 11 decreases, the pressure in water tank 1 decreases, the pressure signal of pressure sensor 7 disappears, and the controller 9 reopens the inlet valve 8 after a period of time when the pressure signal of pressure sensor 7 disappears, to replenish water tank 1.

[0053] This invention discloses a sanitary cleaning device for posterior washing and / or feminine washing, comprising a water pump, a heater, a spray boom device, and a water tank device as described above. The heater has a built-in heating chamber located downstream of the water tank 1, or, the heater does not have a heating chamber but is located in a pre-set heating chamber within the water tank 1. Water in the water tank 1 is pumped to the heating chamber by the water pump and finally sprayed out from the spray boom device to achieve the posterior washing and / or feminine washing functions.

[0054] The present invention provides a water tank level control device and method, a water tank device, and a sanitary cleaning device. The parts not described herein are the same as or can be implemented using existing technologies.

[0055] The above embodiments are only used to further illustrate a water tank level control device and method, a water tank device and a sanitary cleaning device of the present invention. However, the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A water tank level control device, comprising a water tank having an inlet, an outlet, and a vent; characterized in that: It also includes a float and a pressure detector for detecting the internal pressure of the water tank. The float is located inside the water tank and rises as the liquid level in the water tank rises. When it rises to the highest position, it restricts the gas in the water tank from being discharged from the vent. When the pressure inside the water tank increases to a value greater than or equal to a first preset value, the pressure detector outputs a pressure signal to control the water tank to stop water intake. It also includes a pressure relief assembly, which comprises a hollow first guide member, a hollow second guide member, and a reset component. The first guide member has a first through hole, and the second guide member has a second through hole. The second guide member is disposed inside the water tank, and the first guide member is movably fitted onto the second guide member. The float is located in the first guide member. The second through hole is higher than the first through hole, and the two connect the vent hole and the inner cavity of the water tank. The float blocks the first through hole by floating upwards, making the inner cavity of the water tank closed. As the water tank continues to be filled with water, the pressure inside the water tank increases. When the pressure inside the water tank increases to a value greater than or equal to a first preset value, the pressure detector outputs a pressure signal to stop the water tank from filling. The first guide member is in its lowest position under the action of the reset component and closes the second through hole. When the pressure inside the water tank increases to a value greater than or equal to the second preset value, the first guide member moves upward under the action of the pressure and opens the second through hole to relieve pressure on the water tank.

2. The water tank level control device according to claim 1, characterized in that: The second through hole is provided on the side wall of the second guide member, and the side wall of the first guide member is provided with a third through hole. When the third through hole is misaligned with the second through hole, the second through hole is in a closed state. When the third through hole is aligned with the second through hole, the second through hole is in an open state. The first guide member is fitted with a sealing gasket that is higher than the third through hole. When the third through hole is misaligned with the second through hole, the sealing gasket blocks the second through hole.

3. The water tank level control device according to claim 1, characterized in that: The first guide member is partially sleeved inside the second guide member. The reset component is a spring, which is sleeved on the first guide member. Its upper end abuts against the first limiting part of the second guide member or the water tank, and its lower end abuts against the second limiting part of the first guide member.

4. The water tank level control device according to claim 1, characterized in that: The first guide member is vertically connected, the first through hole is located in the first guide member, and the side wall of the first guide member is provided with a fourth through hole that connects the first through hole and the inner cavity of the water tank and is lower than the second through hole. The upper edge of the fourth through hole is higher than the preset highest liquid level of the water tank. The second guide member is vertically connected, and its upper opening is connected to the vent hole.

5. The water tank level control device according to claim 1, characterized in that: The pressure detector is installed inside the water tank and is above the preset maximum liquid level of the water tank; the pressure detector is a pressure sensor.

6. A method for controlling the liquid level of a water tank, wherein the water tank is provided with an inlet, an outlet, and a vent; characterized in that: A float is installed inside the water tank. The float rises as the liquid level in the water tank rises. When it rises to the highest position, it restricts the gas in the water tank from being discharged from the vent. When the pressure detector detects that the pressure in the water tank has increased to a value greater than or equal to a first preset value, it controls the water tank to stop filling with water, or outputs a signal to control the water tank to stop filling with water. It also includes a pressure relief assembly, which comprises a hollow first guide member, a hollow second guide member, and a reset component. The first guide member has a first through hole, and the second guide member has a second through hole. The second guide member is disposed inside the water tank, and the first guide member is movably fitted onto the second guide member. The float is located in the first guide member. The second through hole is higher than the first through hole, and the two connect the vent hole and the inner cavity of the water tank. The float blocks the first through hole by floating upwards, making the inner cavity of the water tank closed. As the water tank continues to be filled with water, the pressure inside the water tank increases. When the pressure inside the water tank increases to a value greater than or equal to a first preset value, the pressure detector outputs a pressure signal to stop the water tank from filling. The first guide member is in its lowest position under the action of the reset component and closes the second through hole. When the pressure inside the water tank increases to a value greater than or equal to the second preset value, the first guide member moves upward under the action of the pressure and opens the second through hole to relieve pressure on the water tank.

7. A water tank device, comprising an inlet valve and a controller, characterized in that: It also includes a water tank level control device as described in any one of claims 1-5, wherein the outlet end of the inlet valve is connected to the inlet of the water tank, the pressure detector and the inlet valve are electrically connected to the controller, and the controller controls the inlet valve to close in a timely manner or with a delay when it receives the pressure signal generated by the pressure detector, and controls the inlet valve to open in a timely manner or with a delay when the pressure signal of the pressure detector disappears.

8. A sanitary cleaning device for posterior washing and / or feminine washing, characterized in that: Includes the water tank device as described in claim 7.

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