Reliable water inlet valve

Abstract

The utility model provides a reliable water inlet valve which is arranged in a water tank and comprises a water inlet body and a first control mechanism arranged on the water inlet body, the water inlet body comprises a water inlet channel and a water outlet channel, and the first control mechanism is provided with a first buoy. The first control mechanism controls the water inlet channel and the water outlet channel to be disconnected or communicated through upward floating and downward falling of the first buoy, and the water level of the water tank when the first buoy floats is defined as the working water level. The water inlet valve further comprises a second control mechanism arranged on the water inlet body and provided with a second buoy, the second control mechanism controls the water outlet channel to be partially closed when the second buoy floats, the water level of the water tank when the second buoy floats is defined as a cut-off water level, and the cut-off water level is higher than the working water level. According to the technical scheme, under the failure condition that the first control mechanism of the water inlet valve cannot stop water normally, the second control mechanism can cut off the water inlet valve, and water entering the water tank from the water inlet valve is prevented from overflowing to the ground from the top end of the water tank.

Description

Technical Field

[0001] The utility model relates to the technical field of water inlet valves for toilet water tanks, in particular to a reliable water inlet valve. Background Art

[0002] In the prior art, a toilet water tank is generally provided with an overflow channel. When the water inlet valve of the water tank cannot stop the water, the water that continuously enters the water tank from the water inlet valve can flow out of the water tank into the toilet bowl through the overflow channel. However, when the overflow channel is blocked or the water pressure of the water inlet is high, resulting in the water inlet flow being greater than the overflow flow of the overflow channel, the water in the water tank may not overflow from the overflow channel into the toilet bowl in time, causing the water in the water tank to overflow from the top opening of the water tank to the ground, thereby posing the risk of flooding the house.

[0003] In view of this, how to design a reliable water inlet valve that can prevent water from overflowing from the top of the water tank to the ground when the water inlet valve fails to stop water normally is an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a reliable water inlet valve, which can cut off the water inlet valve when the water inlet valve fails to stop water normally, so as to prevent the water entering the water tank through the water inlet valve from overflowing from the top of the water tank to the ground.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A reliable water inlet valve is arranged in a water tank, comprising a water inlet body and a first control mechanism arranged on the water inlet body, the water inlet body comprising a water inlet channel and a water outlet channel, the first control mechanism having a first float, the first control mechanism controlling the water inlet channel and the water outlet channel to be cut off or connected by the rising and falling of the first float, the water level of the water tank when the first float floats is defined as a working water level, the water inlet valve also comprises a second control mechanism arranged on the water inlet body and having a second float, the second control mechanism controlling the partial closure of the water outlet channel when the second float floats, the water level of the water tank when the second float floats is defined as a cut-off water level, and the cut-off water level is higher than the working water level.

[0007] In some preferred or optional embodiments, a shut-off port is provided on the water outlet channel, and the second control mechanism also includes a shut-off member, which can move between an open position separated from the shut-off port and a shut-off position coordinated with the shut-off port, and the shut-off member cooperates with the second buoy, and when the second buoy floats, it drives the shut-off member to move from the open position to the shut-off position, and when in the shut-off position, the shut-off member partially closes the shut-off port.

[0008] In some preferred or optional embodiments, the shut-off member is provided with a through flow hole, and when the shut-off member cooperates with the shut-off port, water in the water outlet channel flows out through the flow hole, and the shut-off member partially closes the shut-off port by opening the flow hole.

[0009] In some preferred or optional embodiments, when the shut-off member cooperates with the shut-off port, the shut-off member partially closes the shut-off port so that a flow gap is provided between the shut-off member and the inner wall of the shut-off port, and water in the water outlet channel flows out through the flow gap.

[0010] In some preferred or optional embodiments, a communicating control cavity is provided on the water outlet channel, the intercepting port is formed at the inlet or outlet of the control cavity, and the intercepting member is rotatably or slidably disposed in the control cavity.

[0011] In some preferred or optional embodiments, the second control mechanism also includes a transmission rod that transmits power to the second buoy and the shut-off member, one end of the transmission rod is rotationally linked with one end of the shut-off member, and the other end is rotationally and slidably matched with the second buoy, and when the second buoy floats, the shut-off member is driven to rotate from the open position to the shut-off position through the transmission rod.

[0012] In some preferred or optional embodiments, the water inlet valve also includes a first water stop cup fixedly connected to the water inlet body, the first float can be movably arranged up and down in the first water stop cup, the top of the first water stop cup forms an opening, and the bottom is provided with a first drain hole, a first one-way valve is provided at the first drain hole, and the position of the top opening of the first water stop cup defines the working water level.

[0013] In some preferred or optional embodiments, the water inlet valve also includes a second water stop cup fixedly connected to the water inlet body, the second float can be movably arranged up and down in the second water stop cup, the top of the second water stop cup forms an opening, and the bottom is provided with a second drainage hole, a second one-way valve is provided at the second drainage hole, the position of the top opening of the second water stop cup defines the interception water level, and the position of the top opening of the second water stop cup is higher than the position of the top opening of the first water stop cup.

[0014] In some preferred or optional embodiments, the first water stopping cup and the second water stopping cup are integrally formed.

[0015] In some preferred or optional embodiments, when the second control mechanism partially closes the water outlet channel, the water outlet flow rate of the water outlet channel is less than or equal to the maximum overflow flow rate of the overflow channel of the water tank.

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

[0017] The utility model adds a second control mechanism on the basis of the water inlet valve which is only provided with the first control mechanism in the prior art. The water level of the water tank when the second float of the second control mechanism floats is defined as the cut-off water level. The cut-off water level is higher than the working water level defined by the first float of the first control mechanism. The second control mechanism controls the water outlet channel of the water inlet valve to be partially closed when its second float floats. With such a design, once the first control mechanism of the water inlet valve cannot stop water normally, causing the water level of the water tank to rise from the working water level to the cut-off water level, the second control mechanism can limit the water outlet flow of the water outlet channel of the water inlet valve, and cut off the water inlet valve. Therefore, it can be designed so that the water outlet flow of the water outlet channel at this time is equal to or less than the overflow flow of the overflow channel of the water tank, ensuring that the water in the water tank can overflow to the designated position (such as the toilet bowl) through the overflow channel normally, and will not continue to rise to the top opening of the water tank, causing overflow from the top opening of the water tank to the ground. That is, the technical solution of the utility model can effectively avoid the risk of water in the water tank overflowing onto the ground when the water-stopping function of the first control mechanism of the water inlet valve fails, and the water inlet valve is safer and more reliable.

[0018] In the utility model, the second control mechanism only controls the partial closure of the water outlet channel, rather than the complete closure, so that a small amount of water is allowed to enter the water inlet valve, and the user can observe the phenomenon of continuous water flow from the sound of the water flow or from the overflow designated position (such as the toilet bowl), thereby judging that the water inlet valve is in an abnormal state, and can timely remind the user to repair and replace the water inlet valve. That is, the second control mechanism only controls the partial closure of the water outlet channel when the water level in the water tank rises to the cut-off water level, which can serve as a reminder to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0020] in:

[0021] Figure 1 It is a three-dimensional assembly diagram of a water inlet valve according to an embodiment of the utility model;

[0022] Figure 2 It is a three-dimensional exploded view of a water inlet valve according to an embodiment of the utility model;

[0023] Figure 3 It is a cross-sectional view of the water inlet valve of one embodiment of the utility model in a working water level state (at this time, the first float is in a state of not floating and about to float, and the second float is in a state of not floating);

[0024] Figure 4 It is a cross-sectional view of a water inlet valve according to an embodiment of the utility model in a cut-off water level state (at this time, the first float is stuck and cannot float, and the second float is in a floating state).

[0025] The accompanying drawings in the figure are as follows:

[0026] 10-water inlet body; 11-water inlet channel; 12-water outlet channel; 121-control chamber; 1211-inlet of control chamber; 1212-outlet (interceptor) of control chamber;

[0027] 20-first control mechanism; 21-first buoy; 22-back pressure valve; 23-lifting rod;

[0028] 30-second control mechanism; 31-second buoy; 311-chute; 32-interceptor; 321-flow hole; 322-jack; 33-transmission rod; 331-insertion shaft; 332-sliding shaft;

[0029] 40-first water stop cup; 41-first water leakage hole; 42-first one-way valve;

[0030] 50 - second water stop cup; 51 - second water leakage hole; 52 - second one-way valve;

[0031] L1-working water level; L2-cut-off water level. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0033] See also Figures 1 to 4The utility model provides a reliable water inlet valve in one embodiment, which is arranged in a water tank (not shown), and includes a water inlet body 10 and a first control mechanism 20 arranged in the water inlet body 10. The water inlet body 10 includes a water inlet channel 11 and a water outlet channel 12. The first control mechanism 20 has a first float 21. The first control mechanism 20 controls the water inlet channel 11 and the water outlet channel 12 to be cut off or connected by the rising and falling of the first float 21. The water level of the water tank when the first float 21 floats is defined as the working water level L1 (such as Figure 3 as shown).

[0034] The first control mechanism 20 can use the known back pressure control principle to control the connection or disconnection between the water inlet channel 11 and the water outlet channel 12, and includes a back pressure valve 22. The back pressure valve 22 generally includes a back pressure chamber (not shown), a water stop rubber pad (not shown), a pressure relief hole (not shown) provided in the back pressure chamber, etc. The first buoy 21 usually controls the opening and closing of the pressure relief hole through a lifting rod 23. Its working principle is roughly as follows: when the first float 21 is in the floating position, the first float 21 closes the pressure relief hole through the lifting rod 23, and the pressure of the back pressure chamber causes the water-stopping rubber pad to move to the closed position that cuts off the water inlet channel 11 and the water outlet channel 12, and the water inlet valve is in a water-stopping state at this time; when the water level of the water tank drops and causes the first float 21 to be in the falling position, the first float 21 opens the pressure relief hole through the lifting rod 23, and the water in the back pressure chamber flows out through the pressure relief hole to relieve pressure, and the water-stopping rubber pad moves to the open position that connects the water inlet channel 11 and the water outlet channel 12 under the water pressure of the water inlet channel 11, and the water inlet valve is in a water-inlet state at this time. The back pressure valve can adopt the existing known structure, which will not be described in detail here.

[0035] It can be understood that the first control mechanism 20 can also adopt the existing known piston control principle to control the connection or disconnection between the water inlet channel 11 and the water outlet channel 12, which includes a piston valve (not shown), and the first float 21 moves between the open position and the closed position by linking a piston (not shown). Its working principle is roughly as follows: when the first float 21 is in the floating position, the first float 21 drives the piston to move to the closed position that cuts off the water inlet channel 11 and the water outlet channel 12, and the water inlet valve is in a water stop state; when the water level of the water tank drops and the first float 21 is in the falling position, the first float 21 drives the piston to move to the open position that connects the water inlet channel 11 and the water outlet channel 12, and the water inlet valve is in a water intake state. The piston valve can adopt the existing known structure, which will not be described in detail here.

[0036] Of course, in addition to the back pressure valve 22 or piston valve described above, the first control mechanism 20 may also adopt other forms of valve structures, as long as the valve structure can control the water inlet channel 11 and the water outlet channel 12 to be disconnected or connected under the control of the first float 21.

[0037] The main improvement of the utility model is that the water inlet valve further includes a second control mechanism 30 provided on the water inlet body 10 and having a second float 31. The second control mechanism 30 controls the water outlet channel 12 to be partially closed when the second float 31 floats. The water level of the water tank when the second float 31 floats is defined as the cut-off water level L2 (such as Figure 4 As shown), the cut-off water level L2 is higher than the working water level L1. In this way, once the first control mechanism 20 of the water inlet valve fails to stop water (there are many reasons why the first control mechanism 20 cannot stop water normally, for example, the first float 21 cannot float normally because it is stuck by the dirt in the water tank, or the pressure relief hole cannot be completely closed due to dirt, or the water-stopping rubber pad cannot be completely closed due to dirt, etc., all of which will cause the first control mechanism 20 to fail to stop water normally), causing the water level of the water tank to rise from the working water level L1 to the cut-off water level L2, the second control mechanism 30 can limit the water outflow of the water outlet channel 12 of the water inlet valve, and cut off the water inlet valve. Thereby, the water outflow of the water outlet channel 12 at this time can be equal to or less than the overflow flow of the water tank, ensuring that the water in the water tank can overflow to the designated position normally through the overflow channel, and will not continue to rise to the top opening of the water tank, causing overflow from the top opening of the water tank to the ground. That is, the technical solution of the utility model can effectively avoid the risk of water in the water tank overflowing onto the ground when the water-stopping function of the first control mechanism of the water inlet valve fails, and the water inlet valve is safer and more reliable.

[0038] In addition, the utility model only controls the partial closure of the water outlet channel 12, rather than the complete closure, so that the water inlet valve is allowed to take in a small amount of water, and the user can observe the phenomenon of continuous water flow from the sound of the water flow or from the overflow designated position (such as the toilet bowl), thereby judging that the water inlet valve is in an abnormal state, and can promptly remind the user to repair and replace the water inlet valve. That is, the second control mechanism 30 only controls the partial closure of the water outlet channel when the water level in the water tank rises to the interception water level L2, which can serve as a reminder to the user.

[0039] Specifically, in this embodiment, the water outlet channel 12 is provided with a communicating control chamber 121, and the control chamber 121 has an inlet 1211 and an outlet 1212 of the control chamber. The water outlet channel 12 is provided with a cut-off port 1212, and in this embodiment, the outlet 1212 of the control chamber 121 is directly used to form the cut-off port 1212. Of course, in other embodiments, the inlet 1211 of the control chamber 121 can also be used as the cut-off port, or the cut-off port can be provided between the inlet 1211 and the outlet 1212 in the control chamber 121.

[0040] Specifically, in this embodiment, the second control mechanism 30 also includes a shut-off member 32, which is rotatably or slidably disposed in the control chamber 121. The shut-off member 32 can move between an open position separated from the shut-off port 1212 and a shut-off position matched with the shut-off port 1212. The shut-off member 32 cooperates with the second buoy 31, and when the second buoy 31 floats, it drives the shut-off member 32 to move from the open position to the shut-off position, and the shut-off member 32 partially closes the shut-off port 1212 in the shut-off position. By setting the control chamber 121, and using the inlet 1211 or outlet 1212 of the control chamber as the shut-off port 1212, and movably setting the shut-off member 32 in the control chamber 121 to separate from or match with the shut-off port 1212, the structure is simple and compact, and the control is more reliable.

[0041] In this embodiment, the shut-off member 32 has a sheet structure. In other embodiments, the shut-off member 32 may also have other shapes. The specific shape of the shut-off member 32 is not limited as long as it can open and close the shut-off port 1212.

[0042] In the present embodiment, the shut-off member 32 controls the partial closure of the water outlet channel 12 by adopting the following specific structure: a through flow hole 321 is provided on the shut-off member 32, and when the shut-off member 32 cooperates with the shut-off port 1212, the water flow of the water outlet channel 12 flows out through the flow hole 321, and the shut-off member 32 partially closes the shut-off port 1212 by opening the flow hole 321.

[0043] As an alternative, the intercepting member 32 may control the partial closure of the water outlet channel 12 not by providing the flow hole 321 on the intercepting member 32, but by forming a flow gap to achieve flow. Specifically, when the intercepting member 32 cooperates with the intercepting port 1212, the intercepting member 32 partially closes the intercepting port 1212, so that there is a flow gap (not shown) between the intercepting member 32 and the inner wall of the intercepting port 1212, and the water in the water outlet channel 12 flows out through the flow gap to achieve partial closure of the intercepting port 1212. The effect of using the flow hole 321 and the flow gap to achieve partial flow is the same, and the structure is simple.

[0044] See also Figure 2In this embodiment, preferably, the second control mechanism 30 further includes a transmission rod 33 for transmission connection between the second buoy 31 and the shutoff member 32. One end of the transmission rod 33 is in rotational linkage with one end of the shutoff member 32, and the other end is in rotational and sliding cooperation with the second buoy 31. When the second buoy 31 floats up, the shutoff member 32 is driven to rotate from the open position to the shutoff position through the transmission rod 33. Specifically, one end (first end) of the transmission rod 33 is provided with an insertion shaft 331, which extends into the control chamber 121 and is plugged and fixed with the insertion hole 322 provided at the rotating end of the shutoff member 32, so that the shutoff member 32 is driven to rotate around its rotating end when the first end of the transmission rod 33 rotates; the other end (second end) of the transmission rod 33 is provided with a sliding shaft 332, and the top end of the second buoy 31 is provided with a transversely arranged long strip slide groove 311. When the second buoy 331 is raised or lowered, the sliding shaft 332 can rotate and slide in the slide groove 311. By providing the transmission rod 33 , the second buoy 331 can reliably drive the shutoff member 32 to rotate in the control chamber 121 , which has a simple structure and reliable transmission.

[0045] In this embodiment, the water inlet valve further includes a first water stop cup 40 fixedly connected to the water inlet body 10, and the first float 21 is movably disposed in the first water stop cup 40. In this embodiment, the first water stop cup 40 adopts an existing known structure, specifically: the top of the first water stop cup 40 is open, the bottom is provided with a first water leakage hole 41, and a first check valve 42 is provided at the first water leakage hole 41. The first check valve 42 has a first buoyancy chamber, and when the water level of the water tank rises to the point where the first check valve 42 floats, the first check valve 42 closes the first water leakage hole 41, and the water in the water tank does not enter the first water stop cup 40 from the first water leakage hole 41, until the water level of the water tank rises to the top opening of the first water stop cup 40, the water in the water tank can quickly enter the first water stop cup 40 from the top opening of the first water stop cup 40, thereby causing the first float 21 to float quickly. After the water tank is drained, the water level of the water tank drops so that the buoyancy of the first buoyancy chamber of the first one-way valve 42 is insufficient, and the first one-way valve 42 drops to open the first drain hole 41, so that the water in the first water stop cup 40 can flow out from the first drain hole 41, and then the first float 21 falls due to insufficient buoyancy. In other words, when the water level of the water tank rises to the top opening of the first water stop cup 40, the first float 21 floats up, and the position of the top opening of the first water stop cup 40 is the working water level L1 (as shown in FIG. Figure 3 As shown in FIG. 4 ), the position of the top opening of the first water stopping cup 40 defines the working water level L1.

[0046] In this embodiment, the water inlet valve further includes a second water stop cup 50 fixedly connected to the water inlet body 10, and the second float 31 is movably disposed in the second water stop cup 50. The second water stop cup 50 of this embodiment adopts a structure similar to that of the first water stop cup 40, specifically: the top of the second water stop cup 50 is open, and the bottom is provided with a second water leakage hole 51, and a second one-way valve 52 is provided at the second water leakage hole 51. The second one-way valve 52 has a second buoyancy chamber. When the water level in the water tank rises to the point where the second one-way valve 52 floats, the second one-way valve 52 closes the second water leakage hole 51, and the water in the water tank does not enter the second water stop cup 50 from the second water leakage hole 51, until the water level in the water tank rises to the top opening of the second water stop cup 50, the water in the water tank can quickly enter the second water stop cup 50 from the top opening of the second water stop cup 50, thereby causing the second float 31 to float quickly. After the water tank is drained, the water level of the water tank drops so that the buoyancy of the second buoyancy chamber of the second one-way valve 52 is insufficient, and the second one-way valve 52 drops to open the second drain hole 51, so that the water in the second water stop cup 50 can flow out from the second drain hole 51, and then the second float 31 falls due to insufficient buoyancy. That is to say, when the water level of the water tank rises to the top opening of the second water stop cup 50, the second float 31 floats up, and the position of the top opening of the second water stop cup 50 is the interception water level L2 (as shown in FIG. Figure 4 As shown in FIG. 1 ), the position of the top opening of the second water stop cup 50 defines the cut-off water level L2. The position of the top opening of the second water stop cup 50 is higher than the position of the top opening of the first water stop cup 40, that is, the cut-off water level L2 is higher than the working water level L1. During the rising process of the water level in the water tank, it first reaches the working water level L1 and then reaches the cut-off water level L2.

[0047] In order to make molding and assembly simpler and more convenient, the first water stop cup 40 and the second water stop cup 50 are preferably integrally molded. Of course, in some other embodiments, the first water stop cup 40 and the second water stop cup 50 can also be independently molded and then separately installed on the water inlet body 10.

[0048] In this embodiment, when the second control mechanism 30 partially closes the water outlet channel 12, the water outlet flow rate of the water outlet channel 12 is less than or equal to the maximum overflow flow rate of the overflow channel of the water tank, thereby ensuring that after the water outlet channel 12 is intercepted by the intercepting member 32, the amount of water entering the water tank through the water inlet valve can all overflow to a designated position (such as a toilet bowl, etc.) through the overflow channel, and will not overflow from the top opening of the water tank to the ground.

[0049] The working process of this embodiment is roughly as follows:

[0050] See also Figure 3At this time, the first control mechanism 20 controls the water inlet channel 11 to be connected with the water outlet channel 12, and the water flow of the water outlet channel 12 flows into the water tank. The water level of the water tank has just reached the top opening position of the first water stop cup 40 (i.e., the working water level L1), and the first float 21 is in a state of not floating and about to float. After the first float 21 floats normally, the first float 21 closes the pressure relief hole of the back pressure valve 22 through the lifting rod 23, and the pressure in the back pressure chamber causes the water stop rubber pad to move to the closed position that cuts off the water inlet channel 11 and the water outlet channel 12, so that the water inlet valve is in a normal water stopping state, and the water level of the water tank is at the working water level L1 and will not continue to rise to the interception water level L2. Therefore, when the first control mechanism 20 can stop water normally, the second float 31 of the second control mechanism 30 will not float, and the second control mechanism 30 will not work;

[0051] See also Figure 4 At this time, the first float 21 of the water inlet valve is stuck by the dirt in the water tank and cannot float normally (that is, the first float 21 remains in the falling position), resulting in the first control mechanism 20 being unable to stop water normally (of course, the reason why the first control mechanism 20 cannot stop water normally may also be that its pressure relief hole cannot be completely closed due to dirt or the water-stopping rubber pad cannot be completely closed due to dirt, etc.), and the water level of the water tank continues to rise from the working water level L1 to the interception water level L2 (that is, the top opening position of the second water-stopping cup 50). At this time, the water in the water tank enters the second water-stopping cup 50, the second float 31 in the second water-stopping cup 50 floats, and the second control mechanism 30 plays a interception role. When the second float 31 floats, it drives the intercepting member 32 to rotate from the open position to the intercepting position through the transmission rod 33, and the water flow in the water outlet channel 12 is intercepted by the intercepting member 32, and can only flow out through the flow hole 321 at a small flow rate. In this way, the second control mechanism 30 can limit the water flow rate of the water outlet channel 12 of the water inlet valve, and intercept the water inlet valve, so that the water flow rate of the water outlet channel 12 can be equal to or less than the overflow flow rate of the water tank, ensuring that the water in the water tank can overflow to the designated position through the overflow channel normally, and will not continue to rise to the top opening of the water tank, causing overflow from the top opening of the water tank to the ground.

[0052] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A reliable water inlet valve, arranged in a water tank, comprising a water inlet body, a first control mechanism arranged on the water inlet body, the water inlet body comprising a water inlet channel and a water outlet channel, the first control mechanism having a first float, the first control mechanism controlling the water inlet channel and the water outlet channel to be cut off or connected by the rising and falling of the first float, the water level of the water tank when the first float floats is defined as the working water level, characterized in that: The water inlet valve also includes a second control mechanism arranged on the water inlet body and having a second float. The second control mechanism controls the partial closure of the water outlet channel when the second float floats. The water level of the water tank when the second float floats is defined as a cut-off water level, which is higher than the working water level.

2. The water inlet valve according to claim 1, characterized in that: The water outlet channel is provided with an intercepting port, and the second control mechanism also includes an intercepting member, which can move between an open position separated from the intercepting port and an intercepting position coordinated with the intercepting port. The intercepting member cooperates with the second buoy, and when the second buoy floats up, it drives the intercepting member to move from the open position to the intercepting position, and when in the intercepting position, the intercepting member partially closes the intercepting port.

3. The water inlet valve according to claim 2, characterized in that: The intercepting member is provided with a through flow hole. When the intercepting member cooperates with the intercepting port, water in the water outlet channel flows out through the flow hole. The intercepting member partially closes the intercepting port by opening the flow hole.

4. The water inlet valve according to claim 2, characterized in that: When the intercepting member cooperates with the intercepting port, the intercepting member partially closes the intercepting port, so that a flow gap is provided between the intercepting member and the inner wall of the intercepting port, and the water in the water outlet channel flows out through the flow gap.

5. The water inlet valve according to claim 2, characterized in that: The water outlet channel is provided with a communicating control cavity, the intercepting port is formed at the inlet or outlet of the control cavity, and the intercepting member is rotatably or slidably arranged in the control cavity.

6. The water inlet valve according to claim 5, characterized in that: The second control mechanism also includes a transmission rod that transmits power to connect the second buoy and the shut-off member, one end of the transmission rod is rotationally linked with one end of the shut-off member, and the other end is rotationally and slidingly matched with the second buoy. When the second buoy floats up, the shut-off member is driven to rotate from the open position to the shut-off position through the transmission rod.

7. The water inlet valve according to claim 1, characterized in that: The water inlet valve also includes a first water stop cup fixedly connected to the water inlet body, the first float can be movably arranged in the first water stop cup up and down, the top of the first water stop cup forms an opening, and the bottom is provided with a first drainage hole, a first one-way valve is provided at the first drainage hole, and the position of the top opening of the first water stop cup defines the working water level.

8. The water inlet valve according to claim 7, characterized in that: The water inlet valve also includes a second water stop cup fixedly connected to the water inlet body, the second float can be movably arranged in the second water stop cup up and down, the top end of the second water stop cup forms an opening, and the bottom is provided with a second drainage hole, and a second one-way valve is provided at the second drainage hole. The position of the top opening of the second water stop cup defines the interception water level, and the position of the top opening of the second water stop cup is higher than the position of the top opening of the first water stop cup.

9. The water inlet valve according to claim 8, characterized in that: The first water-stopping cup and the second water-stopping cup are integrally formed.

10. The water inlet valve according to any one of claims 1 to 9, characterized in that: When the second control mechanism partially closes the water outlet channel, the water outlet flow rate of the water outlet channel is less than or equal to the maximum overflow flow rate of the overflow channel of the water tank.

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