Water inlet valve for closestool water tank

Abstract

The utility model provides a water inlet valve for a closestool water tank, which comprises a valve body internally provided with a water inlet channel, a water outlet channel and a valve port, the valve port is positioned between the water inlet channel and the water outlet channel, a second filter screen is integrally formed on one side of the valve port positioned on the water inlet channel, and a water stop surface is formed on one side of the valve port positioned on the water outlet channel; the water stop assembly comprises a water stop pad movably arranged in the valve body, and the water stop pad is matched with the water stop surface to open or close the valve port; the part, located on the upper portion of the valve body, of the filtering piece and the water inlet channel forms a filtering cavity used for installing the filtering piece, the filtering cavity upwards penetrates through the valve body to form a top end opening in the top end of the valve body, the filtering piece is detachably arranged in the filtering cavity through the top end opening, the valve port is formed in the side wall of the filtering cavity, and the axis of the filtering cavity is arranged in the longitudinal direction. The axis of the valve port is arranged in the radial direction of the filtering cavity. The water inlet valve is reliable in function, the problem that water cannot be stopped normally due to the fact that the water stop pad is attached or blocked by impurities can be effectively solved, and the noise problem can be effectively solved.

Description

Technical Field

[0001] The utility model relates to a water inlet valve for a toilet water tank. Background Art

[0002] Most of the existing water inlet valves for toilet water tanks control water inlet and water stop by the principle of pressure difference. It usually includes a water stop pad, and very small flow channels are usually provided on the water stop pad, so that the water flow in the water inlet channel can flow through the very small flow channels to the back pressure cavity. Since the flow channels are very small, they are relatively easy to be blocked. In addition, if impurities in the water adhere to the water stop pad, the water stop pad cannot seal and stop water normally. In order to prevent the flow channels from being blocked by impurities or the water stop pad from adhering to impurities and being unable to stop water, a filter element is usually provided in the water inlet channel of the water inlet valve to intercept impurities in the water.

[0003] The filter elements of the prior art are all designed to be detachable to facilitate cleaning of the filter elements. In order to facilitate disassembly and assembly of the filter elements, some water inlet valves of the prior art install the filter elements on the upper part of the valve body, so that they can be inserted into or pulled out of the valve body through the opening at the top of the valve body, and the disassembly and assembly are more convenient and easy. For the water inlet valve with the filter element placed at the top, in order to facilitate layout, its water stop assembly is usually arranged on the side of the valve body. Summary of the Utility Model

[0004] The inventor found that the water inlet valve with the filter element placed at the top in the prior art has the following two defects: First, during the process of disassembling and cleaning the filter element, the impurities intercepted by the filter element are very likely to be brought to the downstream of the filter element. In this way, after reinstalling the cleaned filter element, these impurities located downstream of the filter element cannot be intercepted by the filter element again, and may then flow to the flow channels of the water stop pad and block the flow channels, or may adhere to the water stop pad, resulting in the water inlet valve being unable to stop water normally; Second, when water enters, the water flow filtered by the filter element turns 90° and then flows to the downstream from the valve port opened by the water stop pad. At the valve port, the water flow turns sharply, resulting in the water inlet flow colliding with each other on the one hand and hitting the pipe wall at the same time on the other hand, resulting in relatively large noise generated here and reducing the use experience.

[0005] To solve the above technical problems, one of the purposes of the utility model is to provide a water inlet valve with more reliable functions, which can make the water stop pad not easily adhere to or be blocked by impurities, and effectively avoid the problem that the water stop pad cannot stop water normally;

[0006] Another purpose of the utility model is to provide a water inlet valve that can improve noise to enhance the use experience of the product.

[0007] To achieve the above purposes, the technical solution adopted by the utility model is:

[0008] A water inlet valve for a toilet water tank, comprising:

[0009] The valve body is provided with a water inlet channel, a water outlet channel and a valve port. The valve port is located between the water inlet channel and the water outlet channel. A second filter screen is integrally formed on one side of the valve port located on the water inlet channel side. A water stop surface is formed on one side of the valve port located on the water outlet channel side;

[0010] The water stop assembly includes a water stop pad movably arranged in the valve body. The water stop pad cooperates with the water stop surface to open or close the valve port;

[0011] The filter element. The part of the water inlet channel located in the upper part of the valve body forms a filter cavity for installing the filter element. The filter cavity penetrates through the valve body upward to form a top opening at the top end of the valve body. The filter element is detachably arranged in the filter cavity through the top opening. The valve port is arranged on the side wall of the filter cavity. The axis of the filter cavity is arranged longitudinally, and the axis of the valve port is arranged along the radial direction of the filter cavity.

[0012] In a preferred embodiment, a first filter screen is provided on the filter element, and the first filter screen is spaced upstream of the second filter screen.

[0013] In a preferred embodiment, a first filter screen is provided on the filter element. The first filter screen is located upstream of the second filter screen and is located below the second filter screen.

[0014] In a preferred embodiment, the filter cavity forms a tee structure having the top opening, the bottom opening and the side opening. The top opening and the bottom opening of the filter cavity are arranged opposite to each other, and the valve port forms the side opening of the filter cavity.

[0015] In a preferred embodiment, when the filter element is taken out from the top opening, the dirt intercepted on the side of the second filter screen facing away from the water stop pad can be taken out.

[0016] In a preferred embodiment, the filter element is sequentially provided with a filtering section, a connecting section and a sealing section along the direction of inserting into the filter cavity. The filtering section is provided with the first filter screen. The sealing section seals the filter cavity. The outer diameter of the connecting section is smaller than the inner diameter of the filter cavity. When the filter element is inserted into the filter cavity in place, the position of the connecting section corresponds to the second filter screen, and the sealing section and the filtering section are respectively located on the upper and lower sides of the second filter screen.

[0017] In a preferred embodiment, the first filter screen is conical, and its outer diameter gradually increases along the direction of inserting into the filter cavity. The outer diameter of the bottom end of the first filter screen matches the inner diameter of the filter cavity.

[0018] In a preferred embodiment, it further includes an end cap which is threadedly connected to the top opening and rotatably connected to the filter element. When the end cap is screwed tightly to the top opening, the filter element is limited in the filter cavity; when the end cap is screwed loose from the top opening, the filter element can be pulled out of the filter cavity.

[0019] In a preferred embodiment, the filter cavity is cylindrical, and the second filter screen is arranged along the arc of the inner wall of the filter cavity on the side wall of one side of the filter cavity; the side wall of the second filter screen away from the filter cavity extends towards the water stop surface along the thickness direction.

[0020] In a preferred embodiment, the water stop assembly further includes a gland and a lifting rod. The gland is fixedly connected to the side part of the valve body. The gland and the side of the water stop pad facing away from the water stop surface enclose a back pressure cavity. The gland is provided with a pressure relief hole communicating with the back pressure cavity. The lifting rod is rotatably arranged on the side part of the valve body, and one end of the lifting rod is in opening and closing cooperation with the pressure relief hole, and the other end is connected to a buoyancy assembly. The water stop pad moves horizontally.

[0021] Compared with the prior art, the utility model has at least the following beneficial effects:

[0022] 1. In the utility model, a second filter screen is integrally formed at the position of the valve port on the side of the water inlet channel. The second filter screen is located between the filter element and the water stop assembly in the water flow direction, so as to form two-stage filtration, which can further effectively intercept impurities. In particular, it can effectively avoid the problem that the impurities intercepted by the filter element are brought to the water stop assembly when the filter element is pulled out of the filter cavity, and form a barrier in front of the water stop assembly, so that the water stop assembly is not easily blocked or attached by impurities to achieve reliable water stop.

[0023] 2. For the water inlet valve of the utility model, the axis of the filter cavity is arranged longitudinally, and the axis of the valve port is arranged in the radial direction of the filter cavity. The water flow of the water inlet valve with such an internal layout turns 90° at the valve port. Therefore, by integrally forming a second filter screen at the position of the valve port on the side of the water inlet channel (i.e., the 90° turning position): on the one hand, the second filter screen is similar to a hollow water baffle and can prevent part of the water flow from flowing back and colliding at this turning position; on the other hand, the second filter screen can disperse a large stream of water at the turning position into multiple small streams of water. The flow directions of the small streams of water tend to be the same and the energy of a single stream is small, so as to achieve the effect of stabilizing the flow, reducing energy loss, and the noise generated by the collision of the small single streams of water with small energy against the pipe wall is also small, thereby achieving the effect of reducing the overall noise of the water inlet valve.

[0024] 3. The second filter screen of the utility model is integrally formed in the valve body, with a simple structure. There is no need to separately assemble the second filter screen, and the overall assembly of the water inlet valve is convenient;

[0025] In summary, the technical solution of the present utility model integrally forms a second filter screen at the position where the valve port is on one side of the water inlet channel. It can not only form a multi-stage filtration with the front filter element to further effectively intercept impurities, but also effectively avoid the problem that the impurities intercepted by the filter element are brought to the water stop assembly during the process of pulling out the filter cavity, resulting in the inability to stop water. In addition, it also has the effect of reducing the water outlet noise of the water inlet valve. By simply setting the second filter screen at this specific position where the valve port is on one side of the water inlet channel, the present utility model makes the water stop function of the water inlet valve more reliable and the noise smaller, with a very ingenious concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present utility model, and constitute a part of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0027] Among them:

[0028] Figure 1 is a three-dimensional structural diagram of a water inlet valve according to an embodiment of the present utility model;

[0029] Figure 2 is a three-dimensional exploded view of a water inlet valve according to an embodiment of the present utility model;

[0030] Figure 3 is a cross-sectional view of a water inlet valve according to an embodiment of the present utility model;

[0031] Figure 4 is a partial cross-sectional view of a water inlet valve according to an embodiment of the present utility model;

[0032] Figure 5 is Figure 4 a partial enlarged view of part A in

[0033] Figure 6 is a cross-sectional view of a water inlet valve in a disassembled state according to an embodiment of the present utility model;

[0034] Figure 7 is a three-dimensional structural diagram of the valve body of a water inlet valve according to an embodiment of the present utility model;

[0035] Figure 8 is a three-dimensional structural diagram of the valve body of a water inlet valve from another angle according to an embodiment of the present utility model;

[0036] Figure 9 is a three-dimensional structural diagram of the filter element of a water inlet valve according to an embodiment of the present utility model.

[0037] The reference numerals in the drawings are:

[0038] 10 - Valve body; 11 - Water inlet channel; 111 - Filter chamber; 1111 - Top opening; 1112 - Bottom opening; 12 - Water outlet channel; 13 - Valve port; 131 - Water stop surface; 14 - Second filter screen;

[0039] 20 - Water stop assembly; 21 - Water stop pad; 22 - Pressing cover; 221 - Pressure relief hole; 23 - Lifting rod; 24 - Back pressure chamber;

[0040] 30 - Filter element; 31 - Filter section; 311 - First filter screen; 32 - Connection section; 33 - Sealing section; 331 - Sealing ring;

[0041] 40 - End cover;

[0042] 50 - Buoyancy assembly;

[0043] L1 - Axis of the filter chamber;

[0044] L2 - Axis of the valve port. Detailed implementation manners

[0045] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0046] Please refer to Figures 1 to 9 , an inlet valve for a toilet water tank provided by a preferred embodiment of the present utility model includes:

[0047] A valve body 10, which is internally provided with a water inlet channel 11, a water outlet channel 12 and a valve port 13. The valve port 13 is located between the water inlet channel 11 and the water outlet channel 12. Water flows from the water inlet channel 11 through the valve port 13 and then flows to the water outlet channel 12 and further into the water tank (not shown) of the toilet; A second filter screen 14 is integrally formed on one side of the valve port 13 located in the water inlet channel 11, and a water stop surface 131 is formed on one side of the valve port 13 located in the water outlet channel 12;

[0048] A water stop assembly 20, including a water stop pad 21 movably arranged in the valve body 10. The water stop pad 21 cooperates with the water stop surface 131 to open or close the valve port 13. Specifically, when the water stop pad 21 is in contact with the water stop surface 131, the valve port 13 is closed, thereby realizing the water stop of the inlet valve. When the water stop pad 21 is separated from the water stop surface 131, the valve port 13 is opened, thereby realizing the water inlet of the inlet valve;

[0049] Filter element 30, the part of the water inlet passage 11 located in the upper part of the valve body 10 forms a filter cavity 111 for installing the filter element 30. That is, the filter cavity 111 is a part of the water inlet passage 11. The filter cavity 111 penetrates upward through the valve body 10 to form a top opening 1111 at the top end of the valve body 10. The filter element 30 is detachably arranged in the filter cavity 111 through the top opening 1111, so that the filter element 30 can be taken out for cleaning. Refer to Figure 4 , the valve port 13 is arranged on the side wall of the filter cavity 111. The axis L1 of the filter cavity 111 is arranged longitudinally, and the axis L2 of the valve port 13 is arranged along the radial direction of the filter cavity 111. That is, the water inlet valve of the present invention is an improvement on the water inlet valve structure in which the water flow in the filter cavity 111 turns 90° at the valve port 13.

[0050] In this embodiment, refer to Figure 3 and Figure 4 , a first filter screen 311 is provided on the filter element 30. The first filter screen 311 is arranged at intervals upstream of the second filter screen 14. That is, the first filter screen 311 is entirely located upstream of the second filter screen 14. Specifically, the first filter screen 311 is entirely located below the second filter screen 14. In this way, the second filter screen 14 and the first filter screen 311 form a multi-stage filtration, and the filtration effect is better. And the second filter screen 14 and the first filter screen 311 are arranged at intervals. Compared with the prior art solution of setting two-stage filtration on the filter element 30 itself, the space for storing impurities in this embodiment is increased, so it is less likely to be blocked.

[0051] In this embodiment, preferably, the size of the holes in the second filter screen 14 is larger than the size of the holes in the first filter screen 311. In this way, on the basis of ensuring that the second filter screen 14 can intercept impurities, it will not limit the flow rate, and the effect is better.

[0052] In this embodiment, the filter cavity 111 forms a tee structure with a top opening 1111, a bottom opening 1112 and a side opening. The top opening 1111 and the bottom opening 1112 of the filter cavity 111 are arranged opposite to each other, and the valve port 13 forms the side opening of the filter cavity 111.

[0053] In this embodiment, in combination with Figure 6 and Figure 9 , the specific structure of the filter element 30 is preferably designed as: a filter section 31, a connection section 32 and a sealing section 33 are arranged in sequence along the direction of inserting into the filter cavity 111. The filter section 31 is provided with a first filter screen 311, a sealing ring 331 is provided on the sealing section 33 to seal the filter cavity 111, and the outer diameter of the connection section 32 is smaller than the inner diameter of the filter cavity 111. When the filter element 30 is inserted into the filter cavity 111 in place, the position of the connection section 32 corresponds to the second filter screen 14, and the sealing section 33 and the filter section 31 are respectively located on the upper and lower sides of the second filter screen 14.

[0054] In order to achieve a better anti-blocking effect, in this embodiment, when the filter element 30 is taken out from the top opening 1111, it can take out the dirt intercepted on the side of the second filter screen 14 facing away from the water stop pad 21 (that is, the side where the second filter screen 14 is located in the filter chamber 111). In this way, during the cleaning process of the filter element 30, the second filter screen 14 is also cleared of blockages, killing two birds with one stone, which is convenient and simple.

[0055] Further preferably, in this embodiment, the first filter screen 311 is conical, and its outer diameter gradually increases along the direction of insertion into the filter chamber 111. Compared with the cylindrical filter element in the prior art, the conical design can, on the one hand, make the filtering area of the first filter screen 311 larger, improving the filtering effect, and on the other hand, can also increase the water passage space between the outer wall of the first filter screen 311 and the inner wall of the filter chamber 111. At the same time, this water passage space also serves as the storage space for impurities of the second filter screen 14, so that more impurities can be filtered and it is less likely to be blocked.

[0056] In this embodiment, the outer diameter of the bottom end of the first filter screen 311 is designed to match the inner diameter of the filter chamber 111, that is, the bottom end of the first filter screen 311 is in contact with the inner wall of the filter chamber 111. In this way, when the filter element 30 is taken out from the top opening 1111, the bottom end of the first filter screen 311 can take out the dirt intercepted on the side of the second filter screen 14 facing away from the water stop pad 21, so as to achieve the purpose of taking out the dirt intercepted on the side of the second filter screen 14 facing away from the water stop pad 21 when the filter element 30 is taken out from the top opening 1111. The structure is simple and reliable.

[0057] In this embodiment, the water inlet valve further includes an end cover 40. The end cover 40 is threadedly connected to the top opening 1111 and is rotatably connected to the filter element 30. When the end cover 40 is screwed tightly with the top opening 1111, the filter element 30 is limited in the filter chamber 111; when the end cover 40 is screwed loose from the top opening 1111, the filter element 30 can be pulled out of the filter chamber 111 through the end cover 40. By providing the end cover 40 to limit and pull out the filter element 30, the disassembly and assembly are more convenient. And the end cover 40 is fixedly connected to the valve body 10 by means of threaded connection, and the connection is more firm, which can effectively avoid the problem that the filter element 30 and the end cover 40 are pushed out of the filter chamber 111 by the water pressure in the water inlet passage 11.

[0058] In this embodiment, the filtering chamber 111 is cylindrical, and the second filter screen 14 is arranged along the arc of the inner wall of the side wall on one side of the filtering chamber 111, which facilitates the integral molding of the second filter screen 14 and the valve body 10. In some embodiments, the side of the second filter screen 14 away from the filtering chamber 111 can extend towards the water stop surface 131 along the thickness direction, that is, the wall thickness of the second filter screen 14 can be designed to be larger, so that the rectifying and flow stabilizing effects of the second filter screen 14 can be better.

[0059] In this embodiment, the water stop assembly 20 further includes a gland 22 and a lifting rod 23. The gland 22 is fixedly connected to the side of the valve body 10. The gland 22 and the side of the water stop pad 21 facing away from the water stop surface 131 enclose a back pressure chamber 24, and the gland 22 is provided with a pressure relief hole 221 communicating with the back pressure chamber 24. The lifting rod 23 is rotatably arranged on the side of the valve body 10, one end of the lifting rod 23 is in opening and closing cooperation with the pressure relief hole 221, and the other end is connected to a buoyancy assembly 50, and the water stop pad 21 moves horizontally. The structure of the water stop assembly 20 can adopt the existing known structure, and the working principles of its water inlet and water stop will not be elaborated in detail here. Generally, when the buoyancy assembly 50 drops with the water level in the toilet tank, it drives the lifting rod 23 to open the pressure relief hole 221. At this time, the water stop pad 21 can move away from the water stop surface 131 under the water pressure of the water inlet channel 11 to open the valve port 13; when the buoyancy assembly 50 floats with the water level in the toilet tank, it drives the lifting rod 23 to close the pressure relief hole 221. At this time, the water stop pad 21 can fit against the water stop surface 131 under the back pressure of the back pressure chamber 24 to close the valve port 13.

[0060] For the water inlet valve of the present utility model, by integrally molding a second filter screen at the position where the valve port is on one side of the water inlet channel, and the second filter screen is located between the filter element and the water stop assembly in the water flow direction, two-stage filtration can be formed to further effectively intercept impurities. In particular, it can effectively avoid the problem that the impurities intercepted by the filter element are brought to the water stop assembly when the filter element is pulled out of the filtering chamber, forming a barrier at the front end of the water stop assembly, so that the water stop assembly is not easily blocked or adhered by impurities, and reliable water stop is achieved.

[0061] The water inlet valve of the utility model has the axis L1 of the filter cavity arranged in the longitudinal direction, and the axis L2 of the valve port arranged in the radial direction of the filter cavity. The water flow of the water inlet valve with such internal layout turns 90 degrees at the valve port. Therefore, a second filter screen is integrally formed at the position where the valve port is located on one side of the water inlet channel (i.e., the 90 degree turning position): on the one hand, the second filter screen is similar to a hollow water baffle plate and can prevent part of the water flow from flowing back and colliding at the turning position; on the other hand, the second filter screen can disperse a large stream of water at the turning position to form multiple small streams of water, the flow directions of each small stream of water tend to be consistent and the energy of a single stream is relatively small, thereby achieving a stabilizing effect and reducing energy loss. The noise generated by the collision of a single small stream of water with relatively small energy with the pipe wall is also relatively small, thereby achieving the effect of reducing the overall noise of the water inlet valve.

[0062] The second filter screen of the utility model is integrally formed in the valve body, and has a simple structure. There is no need to assemble the second filter screen separately, and the overall assembly of the water inlet valve is convenient.

[0063] In summary, the technical solution of the utility model is to form a second filter screen in one piece at the position where the valve port is located on one side of the water inlet channel, which can not only form a multi-stage filtration with the filter element at the front end to further effectively intercept impurities, but also effectively avoid the problem that the impurities intercepted by the filter element are brought to the water stop component during the process of pulling out the filter cavity, resulting in the inability to stop water. In addition, it also has the effect of reducing the water outlet noise of the water inlet valve. The utility model can make the water stop function of the water inlet valve more reliable and less noisy by simply setting a second filter screen at this specific position where the valve port is located on one side of the water inlet channel, and the design is very ingenious.

[0064] 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 water inlet valve for a toilet tank, characterized in that: include: A valve body, wherein a water inlet channel, a water outlet channel and a valve port are provided therein, wherein the valve port is located between the water inlet channel and the water outlet channel, wherein the valve port is located at one side of the water inlet channel and is integrally formed with a second filter screen, and wherein the valve port is located at one side of the water outlet channel to form a water stop surface; A water-stop assembly, comprising a water-stop pad movably arranged in the valve body, the water-stop pad cooperates with the water-stop surface to open or close the valve port; A filter element, wherein the portion of the water inlet channel located at the upper portion of the valve body forms a filter cavity for installing the filter element, the filter cavity penetrates the valve body upward to form a top opening at the top end of the valve body, the filter element is detachably arranged in the filter cavity through the top opening, the valve port is arranged on the side wall of the filter cavity, the axis of the filter cavity is arranged longitudinally, and the axis of the valve port is arranged along the radial direction of the filter cavity.

2. The water inlet valve according to claim 1, characterized in that: The filter element is provided with a first filter screen, and the first filter screen is arranged upstream of the second filter screen at intervals.

3. The water inlet valve according to claim 1, characterized in that: The filter element is provided with a first filter screen, the first filter screen is located upstream of the second filter screen, and the first filter screen is located below the second filter screen.

4. The water inlet valve according to claim 1, characterized in that: The filter cavity forms a three-way structure having the top opening, the bottom opening and the side opening. The top opening and the bottom opening of the filter cavity are arranged opposite to each other, and the valve port forms the side opening of the filter cavity.

5. The water inlet valve according to claim 1, characterized in that: When the filter element is taken out from the top opening, the dirt intercepted on the side of the second filter screen facing away from the water-stopping pad can be taken out.

6. The water inlet valve according to claim 3, characterized in that: The filter element is provided with a filter section, a connection section and a sealing section in sequence along the direction of insertion into the filter cavity; the filter section is provided with a first filter screen; the sealing section seals the filter cavity; the outer diameter of the connection section is smaller than the inner diameter of the filter cavity; when the filter element is inserted into the filter cavity and in place, the position of the connection section corresponds to the second filter screen; the sealing section and the filter section are respectively located at the upper and lower sides of the second filter screen.

7. The water inlet valve according to claim 6, characterized in that: The first filter screen is conical in shape, and its outer diameter gradually increases along the direction of insertion into the filter cavity. The outer diameter of the bottom end of the first filter screen matches the inner diameter of the filter cavity.

8. The water inlet valve according to claim 1, characterized in that: It also includes an end cap, which is threadedly connected to the top opening and rotatably connected to the filter element. When the end cap and the top opening are threadedly tightened, the filter element is limited in the filter cavity; when the end cap and the top opening are threadedly loosened, the filter element can be pulled out of the filter cavity.

9. The water inlet valve according to claim 1, characterized in that: The filter cavity is cylindrical, and the side wall of the second filter screen located on one side of the filter cavity is arranged along the curvature of the inner wall of the filter cavity; The side wall of the second filter screen away from the filter cavity extends toward the water stop surface along the thickness direction.

10. The water inlet valve according to claim 1, characterized in that: The water-stop assembly also includes a pressure cover and a lifting rod. The pressure cover is fixedly connected to the side of the valve body. The pressure cover and the side of the water-stop pad facing away from the water-stop surface form a back-pressure cavity. The pressure cover is provided with a pressure relief hole connected to the back-pressure cavity. The lifting rod is rotatably arranged on the side of the valve body, and one end of the lifting rod cooperates with the opening and closing of the pressure relief hole, and the other end is connected to a buoyancy assembly. The water-stop pad moves laterally.

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