Anti-clogging sewage valve and toilet

Abstract

The utility model belongs to the technical field of bathroom sanitary wares, concretely is a kind of anti-blocking sewage valve and closestool. The sewage valve includes valve body, is equipped with straight-through flow channel, and the front end interface of valve body is communicated with the bottom sewage outlet of closestool seat, and the lower end interface of valve body is communicated with sewer pipe;Linear drive mechanism, fixed in the rear end of valve body;Plunger assembly, slidably arranged in straight-through flow channel, and with linear drive mechanism output end fixed connection;Sliding sealing assembly, fixed on plunger assembly, with plunger assembly synchronous sliding and sealing the gap between plunger assembly and straight-through flow channel inner wall;Wherein, linear drive mechanism drives plunger assembly to do linear reciprocating motion in straight-through flow channel, to open or close lower end interface. Linear reciprocating motion of plunger assembly in straight-through flow channel is controlled by linear drive mechanism, avoid the cooperation gap generated by rotary motion, effectively prevent foreign matter jam, with the advantages of reliable structure, long service life.

Description

Technical Field

[0001] This utility model belongs to the field of sanitary ware technology, specifically an anti-clogging drain valve and toilet. Background Technology

[0002] Currently, the mainstream toilet flushing technologies mainly include three types: bellows-pipe flushing, right-angle pipe rotary flushing, and ball valve rotary flushing. The bellows-pipe flushing type relies on the up-and-down rotation of the bellows to open and close the drain outlet and form a water seal. However, its pleated structure easily traps dirt and breeds bacteria, and repeated deformation can easily lead to material fatigue and fracture, resulting in a short service life and poor reliability. Both the right-angle pipe rotary flushing and ball valve rotary flushing types rely on rotational motion to control the opening and closing of the drain channel. The right-angle pipe rotary flushing type guides wastewater to the drain box by rotating the right-angle pipe 90 degrees, and then discharges it into the sewer pipe from the drain box. The ball valve rotary flushing type opens and closes the drain pipe by rotating the ball valve. However, in both of these structures, there are unavoidable clearances between the rotating components (between the right-angle pipe and the drain box, and between the ball valve and the valve seat). In actual use, hard particles or foreign objects such as hair mixed in with sewage can easily get stuck in these gaps, causing the drive mechanism to spin freely or jam, resulting in the failure of the sewage discharge function. These structural defects make existing sewage valves generally face problems of poor reliability and high maintenance costs in long-term use.

[0003] Therefore, there is an urgent need to develop a toilet drain valve and toilet that can fundamentally prevent foreign objects from getting stuck and has a highly reliable anti-clogging capability. Utility Model Content

[0004] The purpose of this utility model is to provide an anti-clogging drain valve, which has the advantages of reliable structure, reduced risk of drive mechanism jamming, and extended service life.

[0005] This utility model adopts the following technical solution: an anti-clogging drain valve, including a valve body with a straight-through flow channel, the front end interface of the valve body being connected to the bottom drain port of the toilet seat, and the lower end interface of the valve body being connected to the drain pipe; a linear drive mechanism fixed to the rear end of the valve body; a plunger assembly slidably disposed in the straight-through flow channel and fixedly connected to the output end of the linear drive mechanism; and a sliding sealing assembly fixed to the plunger assembly, sliding synchronously with the plunger assembly and sealing the gap between the plunger assembly and the inner wall of the straight-through flow channel.

[0006] The linear drive mechanism drives the plunger assembly to perform linear reciprocating motion in the straight-through flow channel to open or close the lower interface.

[0007] Furthermore, the plunger assembly includes a first sealing piston fixedly connected to the output end of the linear drive mechanism; a second sealing piston is coaxially fixedly mounted on the front end of the first sealing piston; a flexible isolation sealing sheet is provided between the first sealing piston and the second sealing piston, the inner edge of which is sealed and fixedly connected to the first sealing piston, and the outer edge is sealed and connected to the inner wall of the straight-through flow channel.

[0008] Furthermore, the flexible isolation sealing sheet is a pleated silicone sealing sheet; the linear drive mechanism drives the first sealing piston to drive the second sealing piston to move synchronously in a linear reciprocating motion, causing the pleated silicone sealing sheet to be passively deformed.

[0009] Furthermore, the sliding sealing assembly includes a first sealing ring and a second sealing ring. The first sealing ring is disposed on the outer wall of the first sealing piston near the linear drive mechanism, and the second sealing ring is disposed on the outer wall of the second sealing piston near the flexible isolation sealing sheet. The first sealing ring and the second sealing ring are interference-fitted with the inner wall of the straight-through flow channel.

[0010] Furthermore, the outer wall of the first sealing piston is provided with a first mounting groove, and the first sealing ring is embedded in the first mounting groove; the outer wall of the second sealing piston is provided with a second mounting groove, and the second sealing ring is embedded in the second mounting groove.

[0011] Furthermore, it also includes an overflow connector located at the upper end of the valve body, with both ends of the overflow connector connected to a straight-through flow channel, and the outlet of the overflow connector connected to the lower interface through the straight-through flow channel.

[0012] Furthermore, the rear end of the second sealing piston is provided with a radially protruding water-blocking edge, and at least two symmetrically distributed axial notches are provided on the water-blocking edge; the side wall of the straight-through flow channel is provided with a transverse guide bar that slides in cooperation with the axial notch; when the linear drive mechanism drives the first sealing piston to move axially, the axial notch of the second sealing piston slides along the transverse guide bar.

[0013] Furthermore, the linear drive mechanism is a through-type lead screw stepper motor, and the lead screw of the through-type lead screw stepper motor is threadedly connected to the first sealing piston.

[0014] Furthermore, the radial cross-sections of the first and second sealing rings are star-shaped.

[0015] This utility model also provides a toilet, including a toilet body, a control unit, and any one of the above-mentioned anti-clogging drain valves, wherein the control unit is electrically connected to a linear drive mechanism.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] The anti-clogging drain valve of this utility model controls the plunger assembly to make linear reciprocating motion in the straight-through flow channel through a linear drive mechanism, avoiding the fitting gap caused by rotational motion and effectively preventing drain failures caused by foreign objects getting stuck. At the same time, the synchronous sliding sealing assembly ensures the reliability of the seal and effectively separates the sewage from the linear drive mechanism. It has the advantages of reliable structure, reduced risk of drive mechanism jamming, and extended service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the anti-clogging drain valve of this utility model;

[0020] Figure 2 This is an exploded structural diagram of the anti-clogging drain valve of this utility model;

[0021] Figure 3 This is a cross-sectional view of the anti-clogging drain valve of this utility model in its initial state;

[0022] Figure 4 This is a cross-sectional view of the anti-clogging drain valve of this utility model in the draining state;

[0023] Figure 5 This is a cross-sectional structural diagram of the toilet in its initial state according to this utility model;

[0024] Figure 6 This is a cross-sectional structural diagram of the toilet in the sewage discharge state in this utility model;

[0025] Figure 7 This is a three-dimensional structural diagram of the second sealing piston in the anti-clogging drain valve of this utility model;

[0026] Wherein: 1-valve body, 11-straight-through flow channel, 110-lateral guide bar, 12-front end interface, 13-lower end interface, 14-fixed seat, 2-linear drive mechanism, 21-screw, 3-plunger assembly, 31-first sealing piston, 310-first mounting groove, 32-second sealing piston, 320-second mounting groove, 321-water-blocking edge, 322-axial notch, 323-inclined arc surface, 33-flexible isolation sealing sheet, 4-sliding sealing assembly, 41-first sealing ring, 42-second sealing ring, 5-overflow connector, 51-outlet, 52-inlet, 6-toilet body, 61-bottom drain outlet, 7-drain pipe. Detailed Implementation

[0027] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] The following is in conjunction with the appendix Figure 1 To be continued Figure 7 The present invention will be described in detail with reference to specific embodiments.

[0029] This utility model provides an anti-clogging drain valve, including a valve body 1 with a straight-through flow channel 11. The front end interface 12 of the valve body 1 is connected to the bottom drain port 61 of the toilet seat, and the lower end interface 13 of the valve body 1 is connected to the drain pipe 7. A linear drive mechanism 2 is fixed to the rear end of the valve body 1. A plunger assembly 3 is slidably disposed in the straight-through flow channel 11 and fixedly connected to the output end of the linear drive mechanism 2. A sliding sealing assembly 4 is fixed to the plunger assembly 3, slides synchronously with the plunger assembly 3, and seals the gap between the plunger assembly 3 and the inner wall of the straight-through flow channel 11. The linear drive mechanism 2 drives the plunger assembly 3 to perform linear reciprocating motion in the straight-through flow channel 11 to open or close the lower end interface 13.

[0030] The straight-through flow channel 11 refers to a cylindrical channel with a smooth inner wall, which can be formed using engineering plastic tubing. Its straight structure reduces the accumulation of contaminants. The linear drive mechanism 2 is a power device that outputs linear reciprocating motion, and its output shaft directly drives the plunger assembly 3. The plunger assembly 3 is a component that slides axially along the straight-through flow channel 11, and its outer diameter maintains a small gap with the inner wall of the straight-through flow channel 11. The sliding sealing assembly 4 is a device that dynamically seals the gap between the plunger assembly 3 and the straight-through flow channel 11, maintaining a continuous sealing effect during sliding.

[0031] Specifically, when the linear drive mechanism 2 pushes the plunger assembly 3 forward, the front end of the plunger assembly 3 closes the lower port 13 of the valve body 1, preventing water from entering the lower port 13 through the straight-through flow channel 11. When sewage needs to be discharged, the linear drive mechanism 2 drives the plunger assembly 3 to slide backward, fully opening the lower port 13. Sewage enters the lower port 13 along the straight-through flow channel 11 and is directly discharged into the sewer pipe 7. The sliding sealing assembly 4 remains in contact with the inner wall of the straight-through flow channel 11 throughout the movement of the plunger assembly 3, effectively preventing sewage from entering the linear drive mechanism 2 and affecting its normal operation. Moreover, since the plunger assembly 3 only moves in a linear motion, the gap between it and the inner wall of the straight-through flow channel 11 is completely sealed by the sliding sealing assembly 4, fundamentally eliminating the possibility of hard particles or hair getting stuck, significantly improving the anti-clogging performance of the sewage valve. At the same time, the dynamic sealing capability of the sliding sealing assembly 4 extends the service life of the equipment and reduces maintenance requirements.

[0032] For details, please refer to Figures 2 to 6 In this embodiment, the plunger assembly 3 includes a first sealing piston 31 fixedly connected to the output end of the linear drive mechanism 2; a second sealing piston 32 is coaxially fixed to the front end of the first sealing piston 31; a flexible isolation sealing sheet 33 is provided between the first sealing piston 31 and the second sealing piston 32, the inner edge of which is sealed and fixedly connected to the first sealing piston 31, and the outer edge is sealed and connected to the inner wall of the straight-through flow channel 11.

[0033] The first sealing piston 31 is a hollow cylindrical sealing body connected to the output end of the linear drive mechanism 2. The linear drive mechanism 2 is fixedly connected to the fixed seat 14 at the rear end of the valve body 1 and is located inside the first sealing piston 31. It can be made of engineering plastic and is used to transmit the driving force of the linear drive mechanism 2 and realize axial displacement. The second sealing piston 32 is an auxiliary sealing body coaxially fixed to the front end of the first sealing piston 31. It can be made of the same material as the first sealing piston 31. The flexible isolation sealing sheet 33 is an annular sealing element with elastic deformation capability, used to dynamically isolate the area between the two pistons and maintain the sealing state between the inner wall of the straight flow channel 11 and the linear drive mechanism 2.

[0034] Specifically, when the linear drive mechanism 2 pushes the first sealing piston 31 to move axially in a linear motion, the second sealing piston 32 moves synchronously. Specifically, the inner edge of the flexible isolation sealing sheet 33 is fixed to the rear end face of the first sealing piston 31, while its outer edge remains sealed and fixed to the inner wall of the straight-through flow channel 11. During the movement of the two sealing pistons, the flexible isolation sealing sheet 33 adapts to the piston displacement through its own elastic deformation. When the lower end interface 13 is fully open, the flexible isolation sealing sheet 33 blocks sewage from entering, preventing it from contacting the first sealing piston 31 and the linear drive mechanism 2 behind it. This effectively prevents sewage from entering the linear drive mechanism area, significantly improving the anti-clogging capability and long-term reliability of the drain valve.

[0035] For details, please refer to Figures 2 to 6 In this embodiment, the flexible isolation sealing sheet 33 is a pleated silicone sealing sheet; the linear drive mechanism 2 drives the first sealing piston 31 to drive the second sealing piston 32 to move linearly and reciprocate synchronously, so that the pleated silicone sealing sheet is passively deformed.

[0036] Among them, the corrugated silicone seal refers to a sealing component with a corrugated structure made of silicone material. The corrugated structure allows the seal to deform uniformly under axial compression or tension. This feature, through the elasticity and corrosion resistance of silicone material, prevents dirt from remaining in the corrugations, thus extending the service life of the drain valve.

[0037] Specifically, when the linear drive mechanism 2 pushes the first sealing piston 31 to move axially, the second sealing piston 32 moves synchronously. The inner edge of the corrugated silicone sealing sheet moves with the second sealing piston 32, while the outer edge remains sealed and fixed to the inner wall of the flow channel. During this process, the elasticity of the silicone material causes the corrugated structure to unfold or contract evenly.

[0038] For details, please refer to Figures 2 to 4 In this embodiment, the sliding sealing assembly 4 includes a first sealing ring 41 and a second sealing ring 42. The first sealing ring 41 is disposed on the outer wall of the first sealing piston 31 near the linear drive mechanism 2, and the second sealing ring 42 is disposed on the outer wall of the second sealing piston 32 near the flexible isolation sealing sheet 33. The first sealing ring 41 and the second sealing ring 42 are interference-fitted with the inner wall of the straight flow channel 11.

[0039] Specifically, the first sealing ring 41 and the second sealing ring 42 can be made of ultra-friction-resistant fluororubber material. The radial pressure generated by their interference fit can prevent impurities in the sewage from entering the linear drive mechanism 2 along the piston axis. The interference fit refers to the assembly method in which the outer diameter of the sealing ring is slightly larger than the inner diameter of the straight-through flow channel 11. Through elastic deformation, the first sealing ring 41 and the second sealing ring 42 maintain continuous contact pressure with the inner wall of the straight-through flow channel 11, maintaining a stable sealing state during the reciprocating motion of the plunger assembly 3.

[0040] Specifically, in the initial state, the first sealing ring 41 forms a first sealing barrier with the inner wall of the straight-through flow channel 11, and the second sealing ring 42 forms a second sealing barrier with the inner wall of the straight-through flow channel 11. The two sealing rings are arranged in an axially staggered manner to form a progressive blocking structure, which avoids the intrusion of impurities due to the failure of a single seal. When the plunger assembly 3 moves axially backward under the action of the linear drive mechanism 2, the first sealing ring 41 and the inner wall of the straight-through flow channel 11 still remain sealed, and the second sealing ring 42 does not contact the inner wall of the straight-through flow channel 11. However, the outer edge of the flexible isolation sealing sheet 33 is sealed and fixed to the inner wall of the straight-through flow channel 11, which can effectively intercept the entry of hard particles or foreign objects such as hair in sewage.

[0041] For details, please refer to Figures 2 to 7 In this embodiment, the outer wall of the first sealing piston 31 is provided with a first mounting groove 310, and the first sealing ring 41 is embedded in the first mounting groove 310; the outer wall of the second sealing piston 32 is provided with a second mounting groove 320, and the second sealing ring 42 is embedded in the second mounting groove 320.

[0042] The first mounting groove 310 is an annular groove protruding from the outer wall of the first sealing piston 31, which can be formed by injection molding, and is used to fix the mounting position of the first sealing ring 41. The depth and width of the annular groove match the size of the first sealing ring 41, and mechanically restricts its circumferential displacement. The second mounting groove 320 is an annular groove protruding from the outer wall of the second sealing piston 32, and its structure is similar to that of the first mounting groove 310. It is used to fix the second sealing ring 42 and prevent it from deflecting due to lateral forces generated by sliding. The geometric constraint of the mounting groove ensures that the sealing ring is always in the predetermined position under dynamic operating conditions, thereby eliminating the risk of gap leakage caused by the displacement or deformation of the sealing ring.

[0043] For details, please refer to Figures 1 to 6 In this embodiment, an overflow connector 5 is also provided on the upper end of the valve body 1. Both ends of the overflow connector 5 are connected to the straight-through flow channel 11, and the outlet 51 of the overflow connector 5 is connected to the lower interface 13 through the straight-through flow channel 11.

[0044] Among them, the overflow connector 5 refers to the inverted U-shaped tubular structure set on the upper part of the valve body 1, which can be implemented by engineering plastic pipe. The two ends of the overflow connector 5 are the inlet 52 and the outlet 51, respectively.

[0045] Specifically, in the initial state, the plunger assembly 3 closes the lower port 13, and the overflow connector 5 connects the upstream and downstream sections of the straight-through flow channel 11 at both ends, forming an inverted U-shaped water seal structure. (See details...) Figure 5Point A is the water seal cover. When the water seal level exceeds the national standard water seal height due to the water replenishment operation, the excess liquid flows in through the inlet 52 of the overflow connector 5 and automatically drains to the lower interface 13 through the outlet 51, avoiding overflow caused by excessive liquid level, forming a stable water seal and preventing odor from rising.

[0046] For details, please refer to Figures 2 to 3 , Figure 7 In this embodiment, the rear end of the second sealing piston 32 is provided with a radially protruding water-blocking edge 321, and at least two symmetrically distributed axial notches 322 are provided on the water-blocking edge 321; the side wall of the straight-through flow channel 11 is provided with a transverse guide strip 110 that slides with the axial notch 322; when the linear drive mechanism 2 drives the first sealing piston 31 to move axially, the axial notch 322 of the second sealing piston 32 slides along the transverse guide strip 110.

[0047] The radially protruding water-blocking edge 21 refers to the outer peripheral extension structure set at the rear end of the second sealing piston 32, which can be implemented by an annular boss. The axial notch 322 of the second sealing piston 32 slides along the transverse guide bar 110, which can effectively prevent the second sealing piston 32 from rotating.

[0048] For details, please refer to Figure 7 In this embodiment, the front end of the second sealing piston 32 is designed as an inclined arc surface that slopes inward from the top. By setting this inclined arc surface, it is convenient to guide conventional pipe cleaning tools smoothly downward into the lower end interface 13 along the straight flow channel 11.

[0049] For details, please refer to Figures 2 to 4 In this embodiment, the linear drive mechanism 2 is a through-type lead screw stepper motor, and the lead screw 21 of the through-type lead screw stepper motor is threadedly connected to the first sealing piston 31.

[0050] Among them, the through-type lead screw stepper motor refers to the lead screw 21 as an extension of the motor rotor, and the rotational motion of the motor is directly converted into the linear motion of the lead screw 21. Specifically, it can be realized by adopting a stepper motor structure with a hollow rotor, in which the lead screw 21 passes through the motor housing and rotates synchronously with the rotor.

[0051] Specifically, when the through-type lead screw stepper motor is powered on, the motor's rotational motion is converted into axial linear motion through the lead screw 21. The threaded connection between the lead screw 21 and the first sealing piston 31 forms a rigid transmission, pushing the first sealing piston 31 to move axially within the straight-through flow channel 11. This achieves backlash-free transmission between the plunger assembly 3 and the linear drive mechanism 2. Furthermore, the high torque characteristic of the lead screw 21 can shear foreign objects adhering to the straight-through flow channel 11, improving anti-clogging capability and operational reliability, and reducing maintenance costs caused by jamming failures.

[0052] For details, please refer to Figures 2 to 6 In this embodiment, the radial cross-section of the first sealing ring 41 and the second sealing ring 42 is star-shaped. The star-shaped cross-section refers to the sealing ring having multiple evenly distributed protrusions on its cross-section. Specifically, this can be achieved using a four-lip symmetrical design. This structure prevents the first sealing ring 41 and the second sealing ring 42 from flipping during axial movement, resulting in a better sealing effect.

[0053] This utility model also provides a toilet, including a toilet body 6, a control unit and any one of the above anti-clogging drain valves, wherein the control unit is electrically connected to the linear drive mechanism 2.

[0054] The toilet body 6 can be manufactured using a one-piece molding process. Its bottom has a drain outlet 61 that is sealed to the front interface 12 of the anti-clogging drain valve, ensuring that wastewater inside the toilet body 6 directly enters the straight-through flow channel 11. This structure provides a stable installation base for the drain valve, ensuring a sealed connection and fixation with the drain pipe 7. The control unit (not shown in the figure) is an electronic control module used to receive operation signals and generate drive commands. It can be implemented using a combination of a microcontroller and a drive circuit, which is existing technology in this field and will not be elaborated here. The control unit detects user operation signals and sends control commands to the linear drive mechanism 2, driving the plunger assembly 3 to move linearly along the axis of the straight-through flow channel 11 according to a set program. Initially, the plunger assembly 3 completely closes the lower interface 13. When wastewater needs to be discharged, the linear drive mechanism 2 receives the operation signal and drives the plunger assembly 3 to move backward, fully opening the lower interface 13. After flushing for a set time, the linear drive mechanism 2 drives the plunger assembly 3 to move forward, causing the plunger assembly 3 to completely close the lower interface 13 again. Because the plunger assembly 3 and the inner wall of the straight flow channel 11 are dynamically sealed by the sliding sealing assembly 4, and there is no gap between rotating parts during the movement, hard particles or hair cannot enter the gap between the moving parts, thus eliminating the risk of jamming.

[0055] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A clog-resistant drain valve, characterized in that, include: The valve body is provided with a straight flow channel. The front end of the valve body is connected to the bottom drain port of the toilet seat, and the lower end of the valve body is connected to the drain pipe. A linear drive mechanism is fixed to the rear end of the valve body; A plunger assembly is slidably disposed within the straight-through flow channel and fixedly connected to the output end of the linear drive mechanism; A sliding sealing assembly is fixed to the plunger assembly, slides synchronously with the plunger assembly, and seals the gap between the plunger assembly and the inner wall of the straight-through flow channel; The linear drive mechanism drives the plunger assembly to perform linear reciprocating motion in the straight-through flow channel to open or close the lower interface.

2. The anti-clogging drain valve according to claim 1, characterized in that, The plunger assembly includes a first sealing piston fixedly connected to the output end of the linear drive mechanism; a second sealing piston is coaxially fixedly mounted on the front end of the first sealing piston; a flexible isolation sealing sheet is provided between the first sealing piston and the second sealing piston, the inner edge of which is sealed and fixedly connected to the first sealing piston, and the outer edge is sealed and connected to the inner wall of the straight-through flow channel.

3. The anti-clogging drain valve according to claim 2, characterized in that: The flexible isolation sealing sheet is a corrugated silicone sealing sheet; the linear drive mechanism drives the first sealing piston to drive the second sealing piston to move synchronously in a linear reciprocating motion, causing the corrugated silicone sealing sheet to be passively deformed.

4. The anti-clogging drain valve according to claim 2, characterized in that, The sliding sealing assembly includes a first sealing ring and a second sealing ring. The first sealing ring is disposed on the outer wall of the first sealing piston near the linear drive mechanism, and the second sealing ring is disposed on the outer wall of the second sealing piston near the flexible isolation sealing sheet. The first and second sealing rings are interference-fitted with the inner wall of the straight-through flow channel.

5. The anti-clogging drain valve according to claim 4, characterized in that: The outer wall of the first sealing piston is provided with a first mounting groove, and the first sealing ring is embedded in the first mounting groove; the outer wall of the second sealing piston is provided with a second mounting groove, and the second sealing ring is embedded in the second mounting groove.

6. The anti-clogging drain valve according to claim 1, characterized in that: It also includes an overflow connector disposed at the upper end of the valve body, the two ends of the overflow connector being connected to the straight-through flow channel, and the outlet of the overflow connector being connected to the lower end interface through the straight-through flow channel.

7. The anti-clogging drain valve according to claim 2, characterized in that: The rear end of the second sealing piston is provided with a radially protruding water-blocking edge, and the water-blocking edge is provided with at least two symmetrically distributed axial notches; the side wall of the straight-through flow channel is provided with a transverse guide strip that slides in cooperation with the axial notches; when the linear drive mechanism drives the first sealing piston to move axially, the axial notches of the second sealing piston slide along the transverse guide strip.

8. The anti-clogging drain valve according to claim 2, characterized in that: The linear drive mechanism is a through-type lead screw stepper motor, and the lead screw of the through-type lead screw stepper motor is threadedly connected to the first sealing piston.

9. The anti-clogging drain valve according to claim 4, characterized in that: The radial cross-sections of the first sealing ring and the second sealing ring are star-shaped.

10. A toilet, characterized in that: The toilet includes a toilet body, a control unit, and an anti-clogging drain valve as described in any one of claims 1 to 9, wherein the control unit is electrically connected to the linear drive mechanism.

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