Anti-blocking blow-down valve and closestool

Abstract

The invention belongs to the technical field of sanitary ware, and particularly relates to an anti-blocking blow-down valve and a closestool. The blow-down valve comprises a valve body which is provided with a straight-through type flow channel, a front end connector of the valve body is communicated with a bottom blow-down opening of a toilet seat, and a lower end connector of the valve body is communicated with a sewer line. The linear driving mechanism is fixed at the rear end of the valve body; the plunger assembly is arranged in the straight-through type flow channel in a sliding mode and fixedly connected with the output end of the linear driving mechanism; the sliding sealing assembly is fixed to the plunger assembly, synchronously slides along with the plunger assembly and seals a gap between the plunger assembly and the inner wall of the straight-through type flow channel; the linear driving mechanism drives the plunger assembly to do linear reciprocating motion in the straight-through type flow channel so as to open or close the lower end connector. The linear driving mechanism is used for controlling the plunger assembly to do linear reciprocating motion in the straight-through type flow channel, fit clearance generated by rotating motion is avoided, clamping stagnation of foreign matter is effectively prevented, and the plunger assembly has the advantages of being reliable in structure and long in service life.

Description

Technical Field

[0001] The invention belongs to the technical field of sanitary ware, and in particular relates to an anti-blocking sewage valve and a toilet. Background Art

[0002] Currently, there are three main types of toilet flushing technologies: bellows-type, right-angle tube-type, and ball-valve-type. The bellows-type relies on driving the bellows up and down to open and close the sewage outlet and form a water seal. However, its pleated structure easily traps dirt and breeds bacteria, and repeated deformation can easily cause material fatigue fracture, resulting in a short service life and poor reliability. Both the right-angle tube-type and ball-valve-type rely on rotational motion to control the opening and closing of the sewage channel. The right-angle tube-type rotates the right-angle tube 90 degrees to direct sewage to the sewage box, which then discharges it into the sewer pipe. The ball-valve-type rotates the ball valve to open and close the sewage pipe. However, in these two structures, there is inevitably a fit gap between the rotating components (between the right-angle tube and the sewage box, and between the ball valve and the valve seat). In actual use, foreign objects such as hard particles or hair mixed in sewage can easily get stuck in these gaps, causing the drive mechanism to idle or get stuck, resulting in 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, it is urgent to develop a toilet drain valve and toilet that can fundamentally avoid foreign matter stuck and have high reliable anti-blocking ability. Summary of the Invention

[0004] The object of the present invention is to provide an anti-blocking sewage valve, which has the advantages of reliable structure, reduced risk of drive mechanism jamming and extended service life.

[0005] The present invention adopts the following technical solution: an anti-blocking sewage valve, comprising a valve body, provided with a straight-through flow channel, a front end interface of the valve body communicating with the bottom sewage outlet of the toilet seat, and a lower end interface of the valve body communicating with the sewer 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; a sliding seal 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 end 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 fixed to the front end of the first sealing piston; a flexible isolation sealing plate 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 perform synchronous linear reciprocating motion, causing the pleated silicone sealing sheet to passively deform.

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

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

[0011] Furthermore, it also includes an overflow communicating vessel arranged at the upper end of the valve body, both ends of the overflow communicating vessel are connected to the straight-through flow channel, and the water outlet of the overflow communicating vessel is connected to the lower end interface through the straight-through flow channel.

[0012] Furthermore, the rear end of the second sealing piston is provided with a radially raised water retaining edge, and at least two symmetrically divided axial notches are provided on the water retaining edge; the side wall of the straight-through flow channel is provided with a transverse guide strip that slides 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 strip.

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

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

[0015] The present invention also provides a toilet, comprising a toilet body, a control unit and any one of the above anti-blocking sewage valves, wherein the control unit is electrically connected to the linear drive mechanism.

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

[0017] The anti-blocking sewage valve of the present invention controls the plunger assembly to perform 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 sewage discharge failures caused by foreign matter getting stuck. At the same time, a synchronous sliding sealing assembly is used to ensure sealing reliability, effectively separating sewage from the linear drive mechanism, and has the advantages of reliable structure, reduced risk of drive mechanism getting stuck, and extended service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the anti-blocking sewage valve of the present invention;

[0020] Figure 2 This is a schematic diagram of the explosion structure of the anti-blocking sewage valve of the present invention;

[0021] Figure 3 This is a cross-sectional view of the anti-blocking sewage valve of the present invention in its initial state;

[0022] Figure 4 This is a cross-sectional view of the anti-blocking drain valve of the present invention in a draining state;

[0023] Figure 5 Schematic diagram of the cross-sectional structure of the toilet in the present invention in the initial state;

[0024] Figure 6 Schematic diagram of the cross-sectional structure of the toilet in the present invention in the sewage discharge state;

[0025] Figure 7 Schematic diagram of the three-dimensional structure of the second sealing piston in the anti-blocking sewage valve of the present invention;

[0026] Among them: 1-valve body, 11-straight-through flow channel, 110-lateral guide strip, 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 retaining 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 communication vessel, 51-water outlet, 52-water inlet, 6-toilet body, 61-bottom sewage outlet, 7-sewer pipe. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0028] The following is combined with Figure 1 To the attached Figure 7 And specific embodiments are described in detail.

[0029] The present invention provides an anti-blocking sewage valve, comprising a valve body 1, provided with a straight-through flow channel 11, the front end interface 12 of the valve body 1 being connected to the bottom sewage outlet 61 of the toilet seat, and the lower end interface 13 of the valve body 1 being connected to the sewer pipe 7; a linear drive mechanism 2 being fixed to the rear end of the valve body 1; a plunger assembly 3 being slidably arranged 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 being fixed on the plunger assembly 3, sliding synchronously with the plunger assembly 3 and sealing the gap between the plunger assembly 3 and the inner wall of the straight-through flow channel 11; the linear drive mechanism 2 driving 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] Among them, the straight-through flow channel 11 refers to a cylindrical channel with a smooth inner wall, which can be specifically formed by processing an engineering plastic pipe. Its straight structure can reduce the retention of dirt. The linear drive mechanism 2 refers to a power device that outputs linear reciprocating motion, and its output shaft directly drives the plunger assembly 3 to move. The plunger assembly 3 refers to 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 refers to a device that dynamically closes the gap between the plunger assembly 3 and the straight-through flow channel 11, and continuously maintains the sealing effect during the sliding process.

[0031] Specifically, when the linear drive mechanism 2 pushes the plunger assembly 3 to move forward, the front end of the plunger assembly 3 closes the lower end interface 13 of the valve body 1, preventing water from entering the lower end interface 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, so that the lower end interface 13 is fully opened, and the sewage enters the lower end interface 13 along the straight-through flow channel 11 and is directly discharged into the sewer pipe 7. The sliding seal assembly 4 always maintains contact with the inner wall of the straight-through flow channel 11 during the movement of the plunger assembly 3, thereby 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 direction, the gap between it and the inner wall of the straight-through flow channel 11 is completely closed by the sliding seal assembly 4, fundamentally eliminating the possibility of foreign objects such as hard particles or hair getting stuck, significantly improving the anti-blocking performance of the sewage valve, and at the same time, the dynamic sealing ability of the sliding seal assembly 4 extends the service life of the equipment and reduces maintenance requirements.

[0032] For details, see Figures 2 to 6In 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] Among them, the first sealing piston 31 refers to an internal 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. Specifically, it can be formed by engineering plastic processing to transmit the driving force of the linear drive mechanism 2 and achieve axial displacement. The second sealing piston 32 refers to an auxiliary sealing body coaxially fixed to the front end of the first sealing piston 31. Specifically, it can be made of the same material as the first sealing piston 31. The flexible isolation sealing sheet 33 refers to an annular seal with elastic deformation capability, which is used to dynamically isolate the area between the two pistons and maintain the sealing state between the inner wall of the straight-through flow channel 11 and the linear drive mechanism 2.

[0034] Specifically, when the linear drive mechanism 2 pushes the first sealing piston 31 to perform axial linear motion, the second sealing piston 32 moves synchronously therewith. Specifically, the inner edge of the flexible isolation sealing plate 33 is fixed to the rear end face of the first sealing piston 31, and the outer edge is 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 plate 33 adapts to the piston displacement through its own elastic deformation. When the lower end interface 13 is fully open, the flexible isolation sealing plate 33 blocks the sewage from coming into contact with the first sealing piston 31 and the linear drive mechanism 2 behind the flexible isolation sealing plate 33, effectively preventing sewage from entering the linear drive mechanism area, and significantly improving the anti-blocking ability and long-term use reliability of the sewage valve.

[0035] For details, see 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 synchronously in a linear reciprocating manner, causing the pleated silicone sealing sheet to passively deform.

[0036] The pleated silicone seal is a sealing component made of silicone material with a pleated structure. This pleated structure allows the seal to deform uniformly when compressed or stretched axially. This feature, leveraging the elasticity and corrosion resistance of the silicone material, prevents dirt from being trapped in the pleats, 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 with it. The inner edge of the pleated silicone seal moves with the second sealing piston 32, while the outer edge maintains a seal with the inner wall of the flow channel. During this process, the elasticity of the silicone material allows the pleated structure to expand and contract evenly.

[0038] For details, see 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 arranged on the side of the outer wall of the first sealing piston 31 adjacent to the linear drive mechanism 2, and the second sealing ring 42 is arranged on the side of the outer wall of the second sealing piston 32 adjacent to the flexible isolation sealing piece 33; the first sealing ring 41 and the second sealing ring 42 are interference fit with the inner wall of the straight-through flow channel 11.

[0039] Specifically, the first and second sealing rings 41, 42 can be made of a super-friction-resistant fluororubber material. The radial pressure generated by their interference fit prevents impurities in the sewage from invading the interior of the linear drive mechanism 2 along the piston's axial direction. An interference fit is an 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 and second sealing rings 41, 42 maintain constant contact pressure with the inner wall of the straight-through flow channel 11, maintaining a stable seal during the reciprocating motion of the plunger assembly 3.

[0040] Specifically, in the initial state, the first sealing ring 41 and the inner wall of the straight-through flow channel 11 form a first sealing barrier, and the second sealing ring 42 and the inner wall of the straight-through flow channel 11 form a second sealing barrier. The two sealing rings are arranged in an axially staggered manner to form a progressive blocking structure to avoid the intrusion of impurities due to 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 remain in a sealed state, and the second sealing ring 42 does not contact the inner wall of the straight-through flow channel 11, but the outer edge of the flexible isolation sealing piece 33 is sealed and fixed to the inner wall of the straight-through flow channel 11, which can effectively intercept the entry of foreign matter such as hard particles or hair in sewage.

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

[0042] Among them, the first mounting groove 310 refers to a raised annular groove provided on the outer wall of the first sealing piston 31, which can be specifically formed by injection molding and is used to fix the installation 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 its circumferential displacement is limited by mechanical interlocking. The second mounting groove 320 refers to a raised annular groove provided on 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 to prevent it from deflecting due to lateral force generated by sliding. The geometric constraint of the mounting groove ensures that the sealing ring is always in the predetermined position under dynamic working conditions, thereby eliminating the risk of gap leakage caused by displacement or deformation of the sealing ring.

[0043] For details, see Figures 1 to 6 This embodiment also includes an overflow manifold 5 arranged at the upper end of the valve body 1, both ends of the overflow manifold 5 are connected to the straight-through flow channel 11, and the water outlet 51 of the overflow manifold 5 is connected to the lower end interface 13 through the straight-through flow channel 11.

[0044] The overflow manifold 5 is an inverted U-shaped tubular structure provided on the upper portion of the valve body 1 , and can be implemented using an engineering plastic pipe. The two ends of the overflow manifold 5 are a water inlet 52 and a water outlet 51 , respectively.

[0045] Specifically, in the initial state, the plunger assembly 3 closes the lower end interface 13, and the two ends of the overflow connector 5 are connected to the upstream and downstream sections of the straight-through flow channel 11, forming an inverted U-shaped water seal structure. Figure 5 Point A is the water seal surface. When the water seal level exceeds the national standard water seal height during the water replenishment operation, the excess liquid flows in through the water inlet 52 of the overflow connector 5 and automatically flows out to the lower end interface 13 through the water outlet 51, avoiding overflow caused by excessive liquid level, forming a stable water seal, and preventing odor from returning.

[0046] For details, see Figures 2 to 3 、 Figure 7 In this embodiment, the rear end of the second sealing piston 32 is provided with a radially raised water retaining edge 321, and the water retaining edge 321 is provided with at least two symmetrically divided axial notches 322; 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] Among them, the radially raised water retaining edge 21 refers to the peripheral extension structure arranged at the rear end of the second sealing piston 32, which can be specifically implemented by an annular boss. The axial notch 322 of the second sealing piston 32 slides along the transverse guide strip 110, which can effectively prevent the second sealing piston 32 from rotating.

[0048] For details, see Figure 7 In this embodiment, the front end of the second sealing piston 32 is designed to be an inclined arc surface that tilts inward from the upper end. By setting this inclined arc surface, it is convenient to guide conventional pipe cleaning tools along the straight-through flow channel 11 and smoothly enter the lower end interface 13.

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

[0050] Among them, a through-type screw stepper motor refers to a motor in which the screw 21 is used as an extension of the motor rotor, and the rotational motion of the motor is directly converted into the linear motion of the screw 21. Specifically, it can be achieved by using a stepper motor structure with a hollow rotor. The 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 and running, the motor's rotational motion is converted into axial linear motion via 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 axially displace within the straight-through flow channel 11. This achieves seamless 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 matter adhering to the straight-through flow channel 11, improving anti-blocking capabilities and operational reliability, while reducing maintenance costs caused by sticking failures.

[0052] For details, see Figures 2 to 6 In this embodiment, the radial cross-sections of the first and second sealing rings 41, 42 are star-shaped. A star-shaped cross-section refers to a seal ring cross-section with multiple evenly distributed protrusions, which can be achieved using a four-lip symmetrical design. This structure prevents the first and second sealing rings 41, 42 from flipping during axial movement, resulting in a better sealing effect.

[0053] The present invention also provides a toilet, comprising a toilet body 6 , a control unit and any one of the above anti-blocking sewage valves, wherein the control unit is electrically connected to the linear drive mechanism 2 .

[0054] The toilet body 6 can be manufactured using an integrated molding process. A bottom drain port 61 is provided at its bottom, sealingly connected to the front port 12 of the anti-blocking drain valve, ensuring that wastewater within the toilet body 6 flows directly into the straight-through flow channel 11. This structure provides a stable mounting base for the drain valve and ensures its sealed connection to the sewer pipe 7. A control unit (not shown) is an electronic control module that receives operating signals and generates drive instructions. Specifically, it can be implemented using a combination of a microcontroller and a drive circuit, a state-of-the-art technology that will not be described in detail here. The control unit detects user operating signals and sends control instructions 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 pre-set program. Initially, the plunger assembly 3 completely closes the lower port 13. When drainage is required, the linear drive mechanism 2 receives the operating signal and drives the plunger assembly 3 backward, fully opening the lower port 13. After the set flushing time, the linear drive mechanism 2 drives the plunger assembly 3 forward, fully closing the lower port 13 again. Since the sliding seal assembly 4 is used to achieve dynamic sealing between the plunger assembly 3 and the inner wall of the straight-through flow channel 11, and there is no gap between the rotating parts during movement, hard particles or hair cannot enter the gaps between the moving parts, thereby eliminating the risk of jamming.

[0055] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in this field after reading this specification are all within the scope of protection of the present invention.

Claims

1. An anti-blocking sewage valve, characterized in that: include: The valve body is provided with a straight-through flow channel, the front end interface of the valve body is connected to the bottom sewage outlet of the toilet seat, and the lower end interface of the valve body is connected to the sewer pipe; a linear drive mechanism, fixed to the rear end of the valve body; A plunger assembly is slidably disposed in the straight-through flow channel and fixedly connected to the output end of the linear drive mechanism; 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; 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 end interface.

2. The anti-blocking 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 fixed to the front end of the first sealing piston; a flexible isolation sealing plate 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-blocking sewage valve according to claim 2, characterized in that: 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 perform synchronous linear reciprocating motion, causing the pleated silicone sealing sheet to be passively deformed.

4. The anti-blocking sewage 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 arranged on the side of the outer wall of the first sealing piston adjacent to the linear drive mechanism, and the second sealing ring is arranged on the side of the outer wall of the second sealing piston adjacent to the flexible isolation sealing sheet; the first sealing ring and the second sealing ring are interference fit with the inner wall of the straight-through flow channel.

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

6. The anti-blocking sewage valve according to claim 1, characterized in that: It also includes an overflow communicator arranged at the upper end of the valve body, both ends of the overflow communicator are connected to the straight-through flow channel, and the water outlet of the overflow communicator is connected to the lower end interface through the straight-through flow channel.

7. The anti-blocking sewage valve according to claim 2, characterized in that: The rear end of the second sealing piston is provided with a radially raised water retaining edge, and the water retaining edge is provided with at least two symmetrically divided axial notches; the side wall of the straight-through flow channel is provided with a transverse guide strip that slides 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 strip.

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

9. The anti-blocking sewage 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: It comprises a toilet body, a control unit and the anti-blocking sewage valve according to any one of claims 1 to 9, wherein the control unit is electrically connected to the linear drive mechanism.

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