An aerosol-resistant toilet seat assembly, toilet bowl and flush control method

Abstract

The application discloses an aerosol-proof toilet seat assembly, a toilet bowl and a flushing control method. The seat assembly comprises a seat body with a central opening, a receiving cavity arranged at the back of the seat body, a curtain partition with one end wound on a reel in the receiving cavity and the other end connected to a traction rod, two parallel guide rails arranged on the lower surface of the seat body and located on both sides of the central opening, a driving mechanism and an air passage assembly. The traction rod slides along the guide rails, so that the curtain partition is unfolded from the receiving cavity to cover the lower part of the central opening before flushing and is retracted after a predetermined time after flushing. The air passage assembly comprises an air inlet one-way valve allowing only external air to enter the closed space and a filtered air outlet valve allowing only air in the closed space to pass through the filter and be discharged. The application does not depend on the toilet cover, has a small closed volume and can be added to an existing toilet bowl. The air inlet and air outlet are arranged in different directions, the water injection positive pressure is released through the filter, the suction negative pressure is supplemented with air, the suction is normally completed and the aerosol is not discharged.

Description

Technical Field

[0001] This invention relates to the field of sanitary ware technology, specifically to an anti-aerosol toilet seat assembly that seals the toilet bowl opening during flushing to suppress the diffusion of flushing aerosols, as well as a toilet including the seat assembly and a flushing control method applied to the seat assembly. Background Technology

[0002] When a toilet is flushed, the water flow impacts the inner wall of the toilet bowl and the water surface, producing a large number of tiny droplets and aerosols containing fecal and urine components, known in the industry as a flush plume. A laser visualization experiment published in *Scientific Reports* in 2022 measured that the aerosols produced by each flush of a regular toilet are ejected upwards at a speed of approximately 2 m / s, reaching a height of 1.5 meters above the seat within 8 seconds. These aerosols then settle on surfaces such as the seat, toilet paper, toothbrush, and sink within the following minutes, becoming one of the transmission routes for enteric pathogens such as norovirus and rotavirus, as well as some respiratory pathogens. A field experiment published in the *American Journal of Infection Control* in 2024 further demonstrated that even when the toilet lid is closed before flushing, the amount of viral contamination on bathroom surfaces does not decrease statistically significantly. This is because there are gaps of several millimeters between the toilet lid and seat, and between the seat and the ceramic rim of the toilet bowl, allowing aerosols to escape through these gaps due to the pressure fluctuations generated by flushing.

[0003] To address the aforementioned issues, existing technologies generally follow three approaches. The first approach involves adding a sealing structure between the toilet seat and the toilet bowl. This could be achieved by installing a sealing ring on the inside of the seat that fits snugly against the bowl, or by installing a sealing strip on the lower surface of the seat that fits snugly against the rim of the toilet bowl, creating a closed cavity when the seat is closed. Some solutions also include vents and filter media on the seat, or a diaphragm-type one-way valve on the seat that allows only inward airflow to mitigate pressure changes during flushing. The common drawbacks of these solutions are: firstly, they still rely on the toilet seat as a partition, depending on the user actively closing the lid before flushing, which is unsuitable since public toilets generally do not have seats; secondly, the enclosed volume formed by the lid, seat, and bowl is large, resulting in greater pressure disturbance during flushing; thirdly, most solutions only have an inward one-way valve without a controlled outward venting path, so the positive pressure created by the rising water and compressed air during the filling phase has nowhere to be released and can only leak from the seal, and the leaking airflow is precisely the unfiltered aerosol channel. The second approach is to add a magnetic or adhesive sealing strip to the existing toilet seat, which is a simplification of the first approach and has the same drawbacks. The third approach is to seal the seat and bowl opening and connect it to the building's mechanical ventilation system to create continuous negative pressure in the bowl, but this requires pre-installed pipes and cannot be applied to existing residential buildings.

[0004] Another type is a fan-shaped rigid blade barrier located between the seat and the toilet bowl. When no one is using it, it unfolds with a spring to cover the toilet bowl opening; when someone sits down, it retracts under the seat due to body weight. Its purpose is to block the toilet bowl when no one is using it. It cannot be rolled up, has no storage cavity or guide rail, no ventilation structure, and is not linked to the flushing action. The closest invention is an electronic toilet seat cover, which has a storage box on the body behind the seat. The front of the storage box has a horizontal slot for a sheet-like isolation component to enter and exit. The isolation component is rolled up or unfolded by a motor-driven roller. When unfolded, it is located between the seat and the toilet body and covers the toilet bowl opening. The lower edge of the long slot has a brush for cleaning the back of the isolation component. The body also has a retractable spray bar to rinse the back of the isolation component, and an air extraction module to remove dirty air from the toilet bowl. This solution recognizes the idea of ​​using a retractable sheet-like partition to block the toilet bowl opening during flushing. However, this partition is simply rolled up and down on a roller with no constraints on either side. It can be lifted up under positive flushing pressure and sucked down under negative pressure, thus failing to create a controlled, enclosed space. More importantly, its method of handling the air below the partition involves adding a fan for active extraction, requiring additional power and ductwork, resulting in high noise and power consumption. Furthermore, the extraction only alleviates negative pressure and cannot address the positive pressure generated by the rising water level during the flushing phase. No existing technology recognizes that the enclosed space below the partition experiences positive pressure during the flushing phase and negative pressure during the siphon phase, with opposite pressure signs. Therefore, separate intake paths (only in, no out) and exhaust paths (only out, no in) with filters must be provided to both contain aerosols within the toilet bowl and not obstruct siphoning, without requiring a fan throughout the process. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by proposing an anti-aerosol toilet seat assembly. This seat assembly is independent of the toilet seat, can be replaced and installed on the existing toilet, automatically seals the toilet bowl opening before flushing, and maintains the pressure balance of the closed space through the directional ventilation paths throughout the flushing process, so that the flushing aerosol is confined in the toilet bowl without affecting the normal completion of siphon flushing.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an anti-aerosol toilet seat assembly, comprising: a seat body 1, the seat body 1 having a central opening 11 for excrement to pass through; a storage cavity 2, located at the rear of the seat body 1; a roller shutter partition 4, the roller shutter partition 4 being a rollable sheet, one end of which is wound around a roller 3 located in the storage cavity 2, and the other end connected to a traction rod 5; two parallel guide rails 6, located on the lower surface of the seat body 1 and respectively on both sides of the central opening 11, the two ends of the traction rod 5 sliding along the two guide rails 6 respectively, so that the roller shutter partition 4 can unfold from the storage cavity 2 towards the front end of the seat body 1 and cover it. Below the central opening 11, or retracted into the storage cavity 2; drive mechanism 8, which is connected to the traction rod 5, is used to drive the roller shutter partition 4 to unfold and retract; and ventilation assembly 7, which includes an air inlet one-way valve 71 and a filter exhaust valve 72. The air inlet one-way valve 71 only allows external air to enter the enclosed space 106. The enclosed space 106 is the space formed by the lower surface of the roller shutter partition 4, the seat body 1, and the toilet bowl 101 and the toilet bowl opening rim 102 after the roller shutter partition 4 is unfolded. The filter exhaust valve 72 includes a filter element 721 and an exhaust valve plate 722, which only allows the air in the enclosed space 106 to be filtered by the filter element 721 and then discharged.

[0007] In the above scheme, the roller shutter partition 4 is located below the seat body 1 and above the toilet bowl opening 102. After unfolding, it together with the seat body 1 and the toilet bowl 101 forms a closed space 106. This space only contains the air above the toilet bowl and has the smallest volume. The unfolding and retraction of the roller shutter partition 4 are completed inside the seat body and do not depend on the toilet seat. The air inlet one-way valve 71 and the filter exhaust valve 72 have opposite directions and opposite resistance requirements, respectively corresponding to the negative pressure in the siphon stage and the positive pressure in the water injection stage.

[0008] Furthermore, the lower surface of the seat ring body 1 is provided with an elastic sealing lip 12 circumferentially outside the central opening 11, and the lower end of the sealing lip 12 contacts the upper surface of the unfolded roller shutter partition 4; the lower surface of the seat ring body 1 is provided with an elastic skirt 14, and the lower end of the skirt 14 contacts the toilet bowl opening rim 102. The sealing lip 12 closes the gap between the roller shutter partition 4 and the seat ring body 1, and the skirt 14 closes the gap between the seat ring body 1 and the toilet bowl opening rim 102. Both are elastic bodies and can absorb differences in the shape and height of different toilet bowl openings.

[0009] Furthermore, the roller blind partition 4 includes multiple parallel slats 41 and a flexible backing layer 42 connecting each slat 41. The slats 41 are metal slats, and each slat 41 has flanges 43 at both ends. The guide rail 6 has a C-shaped groove 61 with its opening facing the central opening 11. The bottom of the C-shaped groove 61 has an inwardly folded bottom lip 62. The flanges 43 extend into the C-shaped groove 61 and are supported by the bottom lip 62. The slats 41 bear the positive and negative pressure of the enclosed space 106. The flexible backing layer 42 allows adjacent slats 41 to bend relative to each other and thus roll up as a whole. The bottom lip 62 prevents the slats 41 from falling off the guide rail 6 under negative pressure.

[0010] Furthermore, the slats 41 are made of aluminum alloy, with a width of 6–10 mm and a thickness of 1.5–2.5 mm, and the pitch between adjacent slats 41 is 7–11 mm; the flexible backing layer 42 is a thermoplastic polyurethane film with a thickness of 0.3–0.8 mm, which is attached to the side of each slat 41 facing the seat ring body 1. Preferably, the slats 41 are 7.4 mm wide, 2 mm thick, and have a pitch of 8 mm, and the flexible backing layer 42 is 0.5 mm thick. Calculations show that under a design pressure of 300 Pa, the maximum deflection of a 2 mm thick aluminum alloy slat with a span of 310 mm is 0.85 mm, while the deflection of a polypropylene slat of the same size reaches 39 mm, which would cause it to detach from the 8 mm high guide rail. Therefore, the slats 41 must be made of metal.

[0011] Furthermore, the outer contour of the seat ring body 1 is a super-ellipse, with an index of 4–6, preferably 5, so that the two guide rails 6 are located within the lower surface of the seat ring body 1 along their entire length. Taking a central opening 11 of 280 mm × 380 mm and a center distance of 320 mm between the two guide rails 6 as an example, with a normal elliptical outer contour, the front end of the seat ring at the guide rail position only extends to 123 mm in front of the center of the opening, while the front end of the guide rail 6 needs to extend to about 194 mm in front of the center of the opening so that the roller blind partition 4 and the traction rod 5 can completely cover the central opening 11; with a super-elliptical outer contour with an index of 5, the front end of the seat ring at the guide rail position extends to 207 mm in front of the center of the opening, just covering the front end of the guide rail 6.

[0012] Furthermore, it also includes a controller 9 and a push-button actuator 93 for triggering toilet flushing. The controller 9 is electrically connected to the drive mechanism 8 and the push-button actuator 93. The controller 9 is configured to: upon receiving a flushing command, first control the drive mechanism 8 to unfold the roller shutter 4 into position, then control the push-button actuator 93 to trigger flushing, and after flushing, keep the roller shutter 4 unfolded for a predetermined time, and then control the drive mechanism 8 to retract the roller shutter 4; the predetermined time is 15–60 s, preferably 30 s. The push-button actuator 93 is attached to the existing flush button 104 of the toilet, so that this seat assembly can be installed without modifying the water circuit of the toilet.

[0013] Furthermore, it also includes a seat occupancy sensor 92 located on the seat body 1 and a limit switch 85 located at the end of the travel of the traction rod 5. Both the seat occupancy sensor 92 and the limit switch 85 are electrically connected to the controller 9. The controller 9 does not control the roller shutter partition 4 to unfold when the seat occupancy sensor 92 detects someone in the seat, and only controls the pressing actuator 93 to trigger flushing after the limit switch 85 is closed. The drive mechanism 8 includes a motor 81. The controller 9 is also configured to monitor the current of the motor 81 during the unfolding of the roller shutter partition 4. When the current exceeds a preset threshold, the unfolding stops and the roller shutter partition 4 retracts. The motor current is proportional to the traction force. The preset threshold corresponds to a traction force of approximately 25 N. If a finger, clothing, or foreign object is caught between the roller shutter partition 4 and the seat body 1 during the unfolding process, the increased resistance triggers the protection, thus achieving anti-pinch protection.

[0014] Furthermore, the bottom plate of the storage cavity 2 is provided with an outlet slit 21 for the roller blind partition 4 to enter and exit. The roller blind partition 4 passes through the outlet slit 21 from the rear edge of the central opening 11 and is wound around the roller slit 3. The front edge of the outlet slit 21 is provided with a front upper scraper lip 221 that contacts the upper surface of the roller blind partition 4. The rear edge of the outlet slit 21 is provided with a lower scraper lip 222 and a rear upper scraper lip 224 arranged opposite to each other. The lower scraper lip 222 contacts the lower surface of the roller blind partition 4, and the rear upper scraper lip 224 contacts the upper surface of the roller blind partition 4. Below the storage cavity 2, there is a washing tray 27 located below the outlet slit 21. The front edge of the washing tray 27 is provided with a front baffle lip 223 that contacts the lower surface of the roller blind partition 4. The bottom of the washing tray 27 is provided with a drain nozzle that extends forward and opens into the inner edge of the toilet bowl opening 102. 271, the inner cavity of the cleaning tray 27 is connected to the toilet bowl 101 of the toilet via the drain nozzle 271. When the roller shutter partition 4 is retracted, the water scraped off its lower surface is discharged into the toilet bowl 101 through the cleaning tray 27 and the drain nozzle 271. The roller 3, the supports at both ends of the roller 3 and the roller shutter partition 4 wound on it constitute a roller shutter box that can be pulled out of the storage cavity 2 as a whole. The front upper scraper lip 221, the lower scraper lip 222 and the rear upper scraper lip 224 are respectively embedded in the mounting grooves on the bottom plate of the storage cavity 2 and are not pulled out with the roller shutter box. The drain nozzle 271 is an inclined groove that extends forward and downward from the bottom of the front wall of the cleaning tray 27. The lower edge of its outlet is provided with a drip edge. The inner cavity of the cleaning tray 27 is provided with a front-to-back through conduit. The traction rope 83 of the drive mechanism 8 passes through the conduit and is separated from the inner cavity of the cleaning tray 27. When the roller shutter partition 4 retracts, its rising section is exposed from below into the inner cavity of the washing tray 27 as it passes through the outlet seam 21. The lower scraper lip 222 and the rear upper scraper lip 224 are arranged opposite each other at the rear edge of the outlet seam 21, simultaneously scraping away the water remaining on both the upper and lower surfaces of the curtain. The scraped water falls vertically into the washing tray 27 and is discharged into the toilet bowl 101 through the drain nozzle 271, without falling onto the top surface of the toilet bowl opening 102 or the ceramic countertop behind it. The front baffle lip 223 seals the front opening of the washing tray 27. All four scraper lips are located before the roller shutter partition 4 enters the inner cavity of the receiving cavity 2, so the amount of water entering the receiving cavity 2 is negligible. The roller shutter box can be removed for washing or replaced as a whole. Arranging the scraping and washing below the outlet seam 21, with the washing tray 27 receiving and centrally draining the water, achieves full coverage, prevents water from falling onto the ceramic surface, and prevents water from entering the receiving cavity 2, as described in Embodiment 8.

[0015] Furthermore, both the intake one-way valve 71 and the filter exhaust valve 72 are located on the receiving cavity 2. The bottom plate of the receiving cavity 2 has a vent 24 located outside the guide rail 6 and opening downwards onto the lower surface of the seat body 1. The receiving cavity 2 communicates with the enclosed space 106 via the vent 24 and the space below the seat body 1. The peripheral cavity enclosed by the skirt 14 below the seat body 1 is located outside the guide rail 6. This cavity communicates with the toilet bowl 101 via the gap between the lower part of the guide rail 6 and the toilet bowl opening edge 102, and is therefore part of the enclosed space 106. The vent 24 opens downwards into this cavity, making the receiving cavity 2 an extension of the enclosed space 106. The two valves on top of the receiving cavity 2 constitute the only controlled ventilation path in the enclosed space 106. The opening pressure difference of the intake one-way valve 71 is 100–300 Pa, and the flow area is not less than 2 cm². 2 The preferred opening pressure difference is 150 Pa and the flow area is 3 cm². 2 Filter element 721 is a pleated filter cartridge with a filtration efficiency of not less than H11, and its airflow area is 60–240 cm². 2 120 cm is preferred 2 The pressure drop is no greater than 300 Pa at an air flow rate of 3 L / s; the opening pressure difference of the exhaust valve plate 722 is 20–100 Pa, preferably 50 Pa; the flow area of ​​the vent 24 is no less than 3 cm² on each side. 2 At a pressure difference of 150 Pa, approximately 6 L / s of air can pass through, which is far greater than the flow rate of the two valves and does not constitute additional resistance.

[0016] Furthermore, a rewind spring 31 is provided inside the rewind 3, and a rotation damper 32 is provided at one end of the rewind 3 to limit the rewind speed; the drive mechanism 8 includes a motor 81, an electromagnetic clutch 821, a rope wheel 82, a traction rope 83, and guide wheels 84 located on both sides of the front end of the seat ring body 1. The motor 81 drives the rope wheel 82 via the electromagnetic clutch 821. The electromagnetic clutch 821 is energized when it is in motion and disengaged when it is de-energized. One end of the traction rope 83 is fixed to the rope wheel 82, and the other end passes around the guide wheel 84 and is connected to the traction rod 5. The motor 81 only does work in the unfolding direction, and the retraction is completed by the rewind spring 31; a manual release button 822 is provided on the side wall of the storage cavity 2. The manual release button 822 is mechanically linked with the electromagnetic clutch 821 to disengage the electromagnetic clutch 821. This design allows the retraction of the roller shutter partition 4 to be independent of electricity: in the event of a power outage, motor failure, or controller malfunction, the electromagnetic clutch 821 automatically disengages, and the roller shutter partition 4 retracts under the action of the retraction spring 31, restoring the toilet to usability; the rotary damper 32 limits the retraction speed to within 0.3 m / s to avoid impact and noise; the manual release button 822 allows the user to manually retract the roller shutter partition 4 under any circumstances.

[0017] Furthermore, it also includes a cleaning nozzle 17, which is disposed on the cleaning tray 27 and located below the outlet slit 21. The cleaning nozzle 17 includes a spray pipe extending along the width direction of the roller shutter partition 4 and a plurality of fan-shaped nozzles distributed along the length direction of the spray pipe. The outlet of each fan-shaped nozzle faces the lower surface of the roller shutter partition 4 that passes through the outlet slit 21. The spray area of ​​the fan-shaped nozzle is located behind the front upper scraper lip 221 and in front of the lower scraper lip 222 and the rear upper scraper lip 224 in the retraction direction of the roller shutter partition 4, and is located at both ends of the roller shutter partition 4 in the width direction of the roller shutter partition 4. Between the end faces; the cleaning nozzle 17 is connected to the cleaning solenoid valve 19 through the cleaning water pipe 18. The water source of the cleaning water pipe 18 is taken from the tee on the inlet angle valve of the toilet tank. Downstream of the cleaning solenoid valve 19, there is an anti-backflow device consisting of two check valves connected in series and a pressure relief port in between, to prevent the water in the cleaning tray 27 from being drawn back and forming a cross connection with the domestic drinking water when the water supply pipeline has negative pressure; the lower surface of the roller shutter partition 4 is provided with a hydrophobic layer 44, the water contact angle of the hydrophobic layer 44 is not less than 110°, and it is preferably a fluorine-containing or siloxane-based easy-clean coating. When the roller shutter partition 4 retracts, each part of its lower surface passes sequentially through the spray zone of the cleaning nozzle 17. The jet removes droplets and dirt from the curtain surface by impact. Then, it immediately passes through the outlet seam 21 and along the oppositely arranged lower scraper lip 222 and upper scraper lip 224, cleaning both the upper and lower surfaces simultaneously. The jet water, the flushed dirt, and the scraped water all fall into the cleaning tray 27 and are discharged into the toilet bowl 101 through the drain nozzle 271. The fixed spray pipe allows the entire curtain surface to actively pass through the spray zone, providing complete coverage and consuming less water, with approximately 0.11 L per retraction.

[0018] Furthermore, the storage cavity 2 is equipped with an ultraviolet lamp 25, which faces the roller shutter partition 4 wound on the roller spool 3. The ultraviolet lamp 25 is an ultraviolet light-emitting diode with a wavelength of 260–285 nm. It is lit for 60–120 seconds after each retraction of the roller shutter partition 4 to disinfect the roller shutter partition 4 in the stored state. The top of the storage cavity 2 is equipped with a removable cavity cover 23, and the cavity cover 23 is equipped with a cavity cover switch 26. The cavity cover switch 26 is connected in series in the power supply circuit of the ultraviolet lamp 25. When the cavity cover 23 is opened, the power supply of the ultraviolet lamp 25 is cut off to prevent ultraviolet rays from irradiating the human body.

[0019] The present invention also provides a toilet, including a toilet bowl 101 and any of the above-mentioned anti-aerosol toilet seat assembly, wherein the seat body 1 is installed on the toilet bowl opening rim 102 of the toilet bowl 101.

[0020] The present invention also provides a toilet flushing control method applied to the aforementioned anti-aerosol toilet seat assembly. The anti-aerosol toilet seat assembly further includes a controller 9, a seat occupancy sensor 92 electrically connected to the controller 9, a limit switch 85 located at the end of the travel of the traction rod 5, a push-button actuator 93 for triggering toilet flushing, a cleaning tray 27 located below the outlet seam 21 on the bottom plate of the storage cavity 2, a cleaning nozzle 17 located on the cleaning tray 27 and facing the lower surface of the roller shutter partition 4 passing through the outlet seam 21, a cleaning solenoid valve 19 controlling the water supply to the cleaning nozzle 17, a drain nozzle 271 located at the bottom of the cleaning tray 27 and opening into the toilet bowl 101, a rewind spring 31 located within the roller 3, a motor 81 located in the drive mechanism 8, an electromagnetic clutch 821 connected in series between the motor 81 and the traction rod 5 and driven when energized and disengaged when de-energized, and a device located in the storage cavity 2. The method for using the ultraviolet lamp 25 inside cavity 2 includes the following steps: S1, receiving a flushing command; S2, detecting the seat occupancy status via the seat occupancy sensor 92; if someone is in the seat, the process ends and a prompt is given; otherwise, proceed to step S3; S3, controlling the drive mechanism 8 to unfold the roller shutter partition 4 along the guide rail 6 to cover the area below the central opening 11; during the unfolding process, monitoring the current of the motor 81; if the current exceeds a preset threshold, the unfolding stops and the roller shutter partition 4 retracts; S4, detecting whether the limit switch 85 is closed to confirm that the roller shutter partition 4 is in place; if it is not in place within a predetermined time limit, an alarm is triggered and the process ends; S5, controlling the push actuator 93 to trigger the toilet to flush; during flushing, external air enters the enclosed space 106 through the air inlet one-way valve 71, and the air in the enclosed space 106 is only discharged through the filter exhaust valve 72; S6, after flushing, maintaining the roller shutter partition 4 unfolded for a predetermined time, the predetermined time being 15–60 seconds. S7. Open the cleaning solenoid valve 19 and de-energize the electromagnetic clutch 821 to release the traction rod 5, so that the roller shutter partition 4 is retracted into the storage cavity 2 under the action of the retraction spring 31. During the retraction process, the lower surface of the roller shutter partition 4 passes through the spray area of ​​the cleaning nozzle 17 in sequence when passing through the outlet seam 21. The cleaning water is discharged into the toilet bowl 101 through the cleaning tray 27 and the drain nozzle 271. After the retraction is completed, close the cleaning solenoid valve 19 and turn on the ultraviolet lamp 25 for 60–120 s.

[0021] Compared with the prior art, the present invention achieves the following technical effects: 1. Not dependent on toilet seat, with a wide range of applications. The roller shutter partition 4 is stored in the storage cavity 2 at the rear of the seat body 1. When unfolded, it is located below the seat and above the rim of the toilet bowl. The closing action is independent of the toilet seat, and it is also applicable to public toilets without a seat. The seat body 1 is installed with standard hinge hole spacing, which can directly replace the existing seat without modifying the ceramic parts and water system.

[0022] 2. Minimal enclosed volume and minimal pressure disturbance. The roller shutter partition 4 is close to the lower surface of the seat body 1, and the enclosed space 106 is only about 6-10 L of air in the upper part of the toilet bowl, which is more than half the size of the solution with the toilet seat as the partition. The pressure change caused by the same rise and fall of the water level is also smaller.

[0023] 3. The air intake and exhaust are set separately, so the siphon is not affected and the aerosol does not leak. According to the lumped parameter simulation, in a single flush of a 6 L siphon toilet, the positive pressure peak of the closed space of the completely sealed solution reaches 33 kPa and the negative pressure peak reaches 20 kPa, and the partition is subjected to a force of more than 2700 N, which no seat-level seal can withstand; the solution with only an inward one-way valve still has a positive pressure peak of 10.5 kPa; while the positive pressure peak of the solution of this invention is 348 Pa and the negative pressure peak is 334 Pa, the partition is subjected to a force of 29 N, the siphon is normally disconnected, and all the air discharged outward passes through the filter element 721.

[0024] 4. The metal slats have sufficient rigidity and a small roll-up volume. The 2 mm thick aluminum alloy slats have a deflection of only 0.85 mm at 300 Pa and will not derail. When the total length of the roller blind partition 4 is about 460 mm, the roll-up outer diameter is about 42 mm, which can be accommodated in the storage cavity 2 with a net height of 51 mm.

[0025] 5. The ultra-elliptical outer contour enables the parallel straight guide rail. The straight guide rail has a simple structure, can be injection molded, and has low motion resistance. The ultra-elliptical outer contour of the seat ring ensures that it falls completely within the seat ring plane, making its appearance consistent with commercially available square smart seat rings.

[0026] 6. The curtain surface is self-cleaning, ensuring its usability is not compromised by dirt on the roller shutter partition 4. When the roller shutter partition 4 retracts, the entire curtain surface passes through the front baffle 223, the front upper scraper lip 221, the spray area of ​​the cleaning nozzle 17, and the cleaning chamber formed by the opposing lower scraper lip 222 and rear upper scraper lip 224 as it passes through the outlet slit 21. The jet water and scraped water are collected by the cleaning tray 27 and discharged into the toilet bowl 101 through the drain nozzle 271. The curtain surface is basically dry when it enters the storage chamber 2, and then it is irradiated by the ultraviolet lamp 25 in the storage chamber 2. The hydrophobic layer 44 prevents water film from remaining on the curtain surface, consuming approximately 0.11 L of water each time. The roller shutter box can be completely removed for cleaning. These five measures ensure that the roller shutter partition 4 remains clean during long-term use. This is a problem that this invention must solve compared to any solution that seals the toilet bowl opening with a cover or plate, and which has not been addressed by existing technologies.

[0027] 7. Control the timing to ensure that the sealing precedes the flushing and that the holding time is longer than the plume. The roller shutter partition 4 should be fully extended before the flushing is triggered, and the flushing should be held for 15–60 s. According to Stokes settling calculations, holding for 30 s will allow all droplets larger than 18 μm to fall back to the water surface from a height of 0.3 m, and the directional jet momentum of the flushing plume will be exhausted during this period. Attached Figure Description

[0028] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0029] Figure 1 A schematic diagram of the overall structure of the anti-aerosol toilet seat assembly provided in this embodiment of the invention, with the roller shutter partition in the unfolded state, installed on the toilet. Figure 2 This is a top view of the anti-aerosol toilet seat assembly provided in an embodiment of the present invention with the roller shutter partition in the unfolded state. The hidden structure below the seat and inside the storage cavity is indicated by dashed lines. Figure 3 for Figure 2 The longitudinal sectional view along the AA direction shows the roller shutter partition in the unfolded state and the positions of the cleaning tray, drain nozzle, cleaning nozzle, squeegee lip and UV lamp. Figure 4 for Figure 2 A longitudinal sectional view along the middle AA direction shows the roller shutter partition in the retracted state; Figure 5 for Figure 2 A magnified view of the part where the guide rail and the curtain slats meet in the transverse sectional view of the middle BB direction; Figure 6 This is a partial structural diagram of the roller shutter partition in an embodiment of the present invention; Figure 7 This is a schematic diagram of the ventilation component in an embodiment of the present invention; Figure 8 This is a schematic diagram of the drive mechanism in an embodiment of the present invention, showing a motor, an electromagnetic clutch, a pulley, a manual release button, a traction rope, a guide wheel, a limit switch, a reel, a rewind spring, and a rotation damper. Figure 9 A flowchart of a toilet flushing control method provided in an embodiment of the present invention; Figure 10 This is a simulation curve showing the change of water level and pressure in the enclosed space over time during a single flushing process in an embodiment of the present invention, under three ventilation schemes. Figure 11 This is a schematic diagram showing the relationship between the superelliptical outer contour of the seat ring body and the position of the guide rail in an embodiment of the present invention; Figure 12 This is a partially enlarged schematic diagram of the curtain cleaning structure and ventilation holes in an embodiment of the present invention. The left side shows the cleaning chamber below the outlet seam during the retraction of the roller blind partition, including the cleaning tray, drain nozzle, cleaning nozzle and its jet, front lip, front upper scraper lip, lower scraper lip, rear upper scraper lip and ultraviolet lamp. The right side shows the ventilation holes and their connection with the cavity around the seat and the toilet bowl.

[0030] Figure Labeling: 100, Toilet bowl; 101, Toilet bowl; 102, Toilet bowl rim; 103, Water tank; 104, Flushing button; 105, Water trap; 106, Enclosed space; 1, Seat body; 11, Central opening; 12, Sealing lip; 13, Support leg; 14, Skirt; 15, Hinge mounting hole; 16, Front stop; 17, Washing nozzle; 18, Washing water pipe; 19, Washing solenoid valve; 2, Receiving cavity; 21, Outlet seam; 22, Squeegee lip; 221, Upper front squeegee lip; 222, Lower squeegee lip; 223, Front retaining lip; 224, Upper rear squeegee lip; 23, Chamber cover; 24, Vent hole; 25, UV lamp; 26, Chamber cover switch; 27, Washing tray; 271. 3. Drain nozzle; 4. Roller shaft; 5. Rewind spring; 6. Rotary damper; 7. Roller blind partition; 8. Slat; 9. Flexible backing layer; 10. Flange; 11. Hydrophobic layer; 12. Traction rod; 13. Guide rail; 14. C-groove; 15. Bottom lip; 16. Ventilation assembly; 17. Inlet check valve; 18. Filter exhaust valve; 19. Filter element; 10. Exhaust valve plate; 10. Drive mechanism; 11. Motor; 12. Sheave; 13. Electromagnetic clutch; 14. Manual release button; 15. Traction rope; 16. Guide wheel; 17. Limit switch; 18. Controller; 19. Button; 10. Seat ring occupancy sensor; 11. Press actuator; 12. Power supply; 13. Status indicator light. Detailed Implementation

[0031] The following are specific embodiments of the present invention, described in conjunction with the accompanying drawings, to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments. Specific details, such as particular configurations and dimensions, are provided in the following description merely to aid in a comprehensive understanding of the embodiments of the present invention. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. In this document, "front" refers to the direction the toilet user faces, i.e., the side away from the water tank, "back" refers to the side closer to the water tank, and "up" and "down" refer to the normal installation state of the toilet.

[0033] Example 1: As Figures 1 to 8 As shown, this embodiment provides an anti-aerosol toilet seat assembly, which is installed on the rim 102 of the toilet bowl 101 of the toilet bowl 100. The toilet tank 103 of the toilet bowl 100 is equipped with a pre-existing flush button 104, and a water trap 105 is connected below the toilet bowl 101. The seat assembly includes a seat body 1, a storage cavity 2, a roller 3, a roller shutter partition 4, a pull rod 5, a guide rail 6, a ventilation assembly 7, a drive mechanism 8, and a controller 9.

[0034] like Figure 11 As shown, the seat ring body 1 is an annular body with a central opening 11 for excrement to pass through. In this embodiment, the central opening 11 is an ellipse with a major axis of 380 mm and a minor axis of 280 mm, and the outer contour of the seat ring body 1 is a superellipse with a major axis of 450 mm, a minor axis of 370 mm, and an exponent of 5. Figure 11 The image shows a regular ellipse with the same major and minor axes as the superellipse, indicated by dashed lines. It can be seen that the outer contour of the superellipse extends further outwards on both sides than the regular ellipse, ensuring that the two parallel straight guide rails 6, with a center distance of 320 mm, fall within the lower surface of the seat body 1 along their entire length. An elliptical contour of the same size cannot accommodate these guide rails. The superellipse is 22 mm thick, and its outer contour can be adjusted according to toilet specifications within the range of 420–480 mm for the major axis and 350–400 mm for the minor axis. Figure 3 and Figure 5 As shown, the lower surface of the seat body 1 has a silicone sealing lip 12 circumferentially arranged outside the central opening 11. The sealing lip 12 is located about 6 mm outside the central opening 11 on both sides, above the top surface of the traction rod 5 at the front end, and about 2 mm above the inner edge of the toilet bowl opening 102 at the rear end. The sealing lip 12 is 2.5 mm thick and 3.2 mm high. Its lower end presses against the upper surface of the roller shutter partition 4 after it is unfolded. The lower surface of the seat body 1 also has support legs 13 with a height of 20 mm. There are four on the annular body and four below the bottom plate of the storage cavity 2. The support legs 13 rest on the toilet bowl opening 102 and the ceramic tabletop behind it to bear the weight of the user, so that the roller shutter partition 4 does not bear the weight, and to maintain a 20 mm gap between the lower surface of the seat body 1 and the top surface of the toilet bowl opening 102 to accommodate the washing tray 27. The lower surface of the seat body 1 has a soft silicone skirt 14 with a height of 20 mm on its outer periphery. The lower end of the seat ring 1 presses against the upper surface of the toilet bowl rim 102 and the ceramic countertop behind it. Its height can be compressed by 5 mm to accommodate different toilet bowl rim heights. The rear of the seat ring body 1 has two hinge mounting holes 15, spaced 155 mm apart, adjustable within the range of 140–160 mm to match the mounting holes of ordinary toilet bowls. A front stop 16 is provided on the inner front side of the seat ring body 1.

[0035] like Figure 3 , Figure 4 and Figure 12As shown, the bottom plate of the storage cavity 2 has an exit slit 21 at the front for the roller blind partition 4 to enter and exit. The exit slit 21 is a transverse opening 330 mm wide and 30 mm long in the front-to-back direction. Its front edge is about 10 mm away from the rear edge of the central opening 11. Each end of the exit slit 21 has a brush strip that abuts against the end face of the curtain slat 41. The roller blind partition 4 is straight within the range of the central opening 11. Starting about 6 mm after the rear edge of the central opening 11, it slopes upward in a direction tangential to the roll body on the roller spool 3 (the slope varies between 0.2 and 0.4 depending on the roll diameter). It passes through the bottom plate within the range of the exit slit 21 and enters the storage cavity 2, and is tangentially wound around the roller spool 3. A silicone squeegee lip 22 is provided at the outlet seam 21, forming a total of four squeegees together with the front baffle lip 223 on the front wall of the washing tray 27. The three squeegees at the outlet seam 21 are as follows: the upper front squeegee lip 221 is fixed to the bottom plate at the front edge of the outlet seam 21, extending downwards and backwards, with its edge pressing against the upper surface of the roller shutter partition 4, sealing the gap at the front of the outlet seam and also serving as a foreign object baffle; the lower squeegee lip 222 is fixed to the bottom plate end face at the rear edge of the outlet seam 21, extending upwards and forwards, with its tip pressing against the lower surface of the rising section of the roller shutter partition 4, approximately 4 mm from the rear edge of the outlet seam 21; the upper rear squeegee lip 224 is fixed to the upper surface of the bottom plate at the rear edge of the outlet seam 21, opposite to the lower squeegee lip 222, extending downwards and forwards, pressing against the upper surface of the rising section of the roller shutter partition 4. Each squeegee lip is a soft silicone lip with a cross-section of 3 mm × 2 mm and a free length of approximately 5 mm, an interference fit of 0.3–0.5 mm, and a linear pressure of approximately 0.10 N / cm. A cleaning tray 27 is located below the front wall of the receiving cavity 2 and directly below the outlet seam 21. The cleaning tray 27 is a shallow tray with a width of 356 mm, a length of 40 mm, and a depth of 15 mm. Its side walls are connected to the lower surface of the shoulder of the seat body 1, and its rear wall is connected to the lower surface of the bottom plate of the receiving cavity 2. The inner surface of the bottom plate is inclined forward and towards the center at 1–2°, and the bottom surface is about 5 mm away from the top surface of the toilet bowl opening 102. A silicone front lip 223 is provided at the top of the front wall of the cleaning tray 27. The front lip 223 extends upward, and the tip of the lip presses against the lower surface of the straight section of the roller shutter partition 4. In the free state, the tip of the lip protrudes about 0.5 mm above the lower surface. mm to form an interference fit; the front lip 223 is set along the full width of the washing tray 27, and the two sections outside the end face of the curtain 41 directly press against the lower surface of the seat body 1, thereby sealing the entire front opening of the washing tray 27; the bottom of the front wall of the washing tray 27 is provided with a sloping groove-shaped drain nozzle 271 extending forward and downward, the drain nozzle 271 is at about 15° with the horizontal plane, the inlet is about 200 mm wide and 4 mm high, and it narrows forward to the outlet, which is about 80 mm wide and 4 mm high. The lower edge of the outlet is provided with a 1 mm drip edge; the drain nozzle 271 passes through about 6 mm below the retracted traction rod 5, and its outlet is located inside the central opening 11, where the half-width of the opening is about 49 mm. The water in the tray falls into the toilet bowl 101 along the sloping groove. The water head required for a flow rate of 3 L / min is less than 1 mm. The drip edge causes the water to detach at the outlet and not re-attach along the bottom of the groove.Two through-tubes, each with an outer diameter of 6 mm and an inner diameter of 4 mm, are installed across the inner cavity of the cleaning tray 27. The axis of each tube is located 169.5 mm from the center on both sides of the seat body 1 in the width direction. A traction rope 83 passes through these tubes, isolating them from the water in the tray's inner cavity. The cleaning tray 27 can be pulled forward for cleaning. The roller 3, its supports at both ends, and the roller shutter partition 4 wound around it form a roller shutter box that can be pulled out entirely from the front of the storage cavity 2. The front upper scraper lip 221, lower scraper lip 222, and rear upper scraper lip 224 are glued to the mounting grooves at the front and rear edges of the outlet seam 21 of the bottom plate of the storage cavity 2. The front baffle lip 223 is glued to the mounting groove at the top of the front wall of the cleaning tray 27. None of these four components are pulled out with the roller shutter box; they can be removed and replaced individually after wear. On the bottom plate of the storage cavity 2, on the left and right sides of the outer side of the cleaning tray 27, there is a set of ventilation holes 24. Each set consists of two rows of three holes with a diameter of 8 mm. The center distances of the two rows from the center line of the seat body 1 are 180 mm and 190 mm, respectively. The three holes in the same row are arranged at a spacing of 12 mm along the front-back direction. The flow area of ​​each set is 3.0 cm. 2The ventilation holes 24 are located on the lower surface of the seat body 1, opening downwards. All ventilation holes 24 are located before the transverse section of the skirt 14, thus opening into the peripheral cavity enclosed by the skirt 14. Six ultraviolet light-emitting diodes with a wavelength of 275 nm are provided below the top plate facing the roller 3 inside the storage cavity 2 as ultraviolet lamps 25, which are evenly distributed at a spacing of about 55 mm along the direction of the roller 3 and about 15 mm away from the surface of the roller blind partition 4 after it is rolled up. The cleaning nozzle 17 is a transverse spray pipe formed on the bottom plate of the cleaning tray 27, located directly below the outlet slit 21 and approximately 7 mm from the rear edge of the outlet slit 21. Eleven deflector-type fan-shaped nozzles with a diameter of 1.0 mm are arranged at 25 mm intervals along the upper surface of the spray pipe. The two outermost nozzles are each 125 mm from the center. The spray direction is tilted forward at approximately 15° from vertical, aiming at the lower surface of the rising section of the roller shutter partition 4 that passes through the outlet slit 21. The spray area is approximately 8 mm from the lower scraper lip 222, with a range of approximately 17 mm. Each nozzle covers approximately 34 mm of the curtain surface, with adjacent coverage areas overlapping by approximately 8.5 mm. The coverage boundaries at both ends are approximately 142 mm from the center. Even when the fan-shaped nozzles spray at their nominal fan angle of 110°, the coverage boundaries at both ends only extend to approximately 149 mm from the center, remaining within the end face of the curtain slat 41 (155 mm from the center), while simultaneously covering half the width 140 mm of the central opening 11. mm, the jet will not cross the end of the curtain slat and enter the end gap of the outlet slit 21; one end of the cleaning nozzle 17 is connected to the normally closed cleaning solenoid valve 19 installed in the receiving cavity 2 via a cleaning water pipe 18 with a diameter of 6 mm; the water inlet of the cleaning solenoid valve 19 is connected to the toilet tank water inlet angle valve via a filter screen and a 3 L / min pressure compensated constant flow limiter via a tee valve; the water outlet of the cleaning solenoid valve 19 is connected in series with a double check valve anti-backflow device, which consists of two check valves connected in series with a pressure relief port in between. When either check valve fails, the pressure relief port releases pressure to the atmosphere, thereby cutting off the backflow passage when negative pressure occurs in the water supply pipeline; the usable height in the seat ring is insufficient to meet the installation height requirements of the atmospheric vacuum breaker (must be 150 mm higher than the overflow water level), so a double check valve anti-backflow device that does not depend on the installation height is selected to prevent the water in the cleaning tray 27 from being sucked back into the domestic drinking water pipeline. The side of the curtain slat 41 facing the toilet bowl 101 is coated with a fluorinated hydrophobic layer 44, with a water contact angle of approximately 115°.

[0036] The roller 3 is arranged horizontally inside the storage cavity 2, with its axis located 24 mm above the upper surface of the bottom plate of the storage cavity 2. The core shaft has a diameter of 16 mm and a length of 320 mm. When fully wound, its outer diameter is 41.5 mm. The lowest point of the roller is still about 3 mm above the upper surface of the bottom plate of the storage cavity 2, and the highest point is about 6 mm below the inner top surface of the storage cavity 2. The roller 3 is equipped with a return spring 31, which is a torsion spring with a return force of 11 N (selectable within the range of 10–13 N), which is about 1.7 times the sum of the friction between the four wiper lips, the sealing lip 12 and the guide rail (about 6.6 N). The other end of the roller 3 is equipped with a silicone oil rotation damper 32 to ensure that the return speed of the roller shutter partition 4 does not exceed 0.3 m / s.

[0037] like Figure 5 and Figure 6 As shown, the roller blind partition 4 includes 58 parallel slats 41 and a flexible backing layer 42 connecting each slat 41. The slats 41 are made of 6063 aluminum alloy profiles, 7.4 mm wide, 2 mm thick, and 310 mm long, with an 8 mm pitch between adjacent slats 41. The flexible backing layer 42 is a 0.5 mm thick thermoplastic polyurethane film, hot-pressed onto the side of each slat 41 facing the seat ring body 1, i.e., the upper surface of the slat 41, allowing adjacent slats 41 to bend relative to each other around the flexible backing layer 42. Each slat 41 has a 2 mm wide flange 43 at both ends. One end of the roller blind partition 4 is fixed and wound onto the roller shaft 3, and the other end is connected to the pull rod 5. The pull rod 5 is an aluminum alloy square tube with a cross-section of 12 mm × 8 mm and a length of 328 mm. The total length of the roller shutter partition 4 is about 460 mm, of which the straight section within the central opening 11 when unfolded is about 380 mm, the rising section from the rear edge of the central opening 11 to the roller 3 is about 70 mm, and the outer diameter after rolling up is about 42 mm, which is less than the net height of the storage cavity 2, which is 51 mm.

[0038] like Figure 2 and Figure 5As shown, two guide rails 6 are fixed parallel to each other on the lower surface of the seat ring body 1, located on the left and right sides of the central opening 11 respectively. The center distance between the two guide rails 6 is 320 mm, and the length is 388 mm. They extend forward from near the rear edge of the central opening 11 to the front end of the seat ring body 1. The rear end of the guide rail 6 is located before the roller blind partition 4 begins to tilt upward. The guide rail 6 is a C-shaped groove 61 with its opening facing the central opening 11. The groove is 8 mm high and 12 mm wide. The bottom of the C-shaped groove 61 is provided with an inwardly folded bottom lip 62. The flanges 43 at both ends of the curtain slat 41 and the two ends of the pull rod 5 extend into the C-shaped groove 61 and rest on the bottom lip 62. There is a gap of about 1.5 mm at the top and bottom between the body of the curtain slat 41 and the groove wall. When the enclosed space 106 is under positive pressure, the slat 41 is pushed upward against the lower surface of the seat body 1 and the sealing lip 12; when the enclosed space 106 is under negative pressure, the flange 43 is supported by the bottom lip 62, and the slat 41 will not fall downward.

[0039] like Figure 7 As shown, the ventilation assembly 7 is located at the top of the receiving cavity 2, and includes an intake check valve 71 and a filter exhaust valve 72. The intake check valve 71 is a silicone umbrella valve with a diameter of 20 mm and a flow area of ​​approximately 3 cm². 2 The opening pressure difference is approximately 150 Pa, with the valve plate facing inwards towards the receiving chamber 2, allowing only external air to enter the receiving chamber 2. The filter exhaust valve 72 includes an exhaust valve plate 722 located below and a filter element 721 located above. The exhaust valve plate 722 is a silicone umbrella valve with a diameter of 30 mm, facing outwards, and an opening pressure difference of approximately 50 Pa, allowing only air from the receiving chamber 2 and the enclosed space 106 to flow outwards. The filter element 721 is a pleated filter element with a filtration efficiency of not less than H11 grade, with dimensions of 120 mm × 60 mm × 14 mm and an airflow area of ​​120 cm². 2At an airflow rate of 3 L / s, the pressure drop is approximately 300 Pa, and all discharged air passes through the filter element 721. The filter element 721 can be removed from the chamber cover 23 for replacement. The boundaries of the enclosed space 106 are as follows: the upper part is the lower surface of the unfolded roller shutter partition 4, the lower part is the toilet bowl 101 and its water surface, and the periphery is the toilet bowl opening rim 102 and the peripheral cavity enclosed by the skirt 14 below the seat body 1. The peripheral cavity is located outside the guide rail 6, and there is a gap of approximately 12 mm between the bottom surface of the guide rail 6 and the toilet bowl opening rim 102. The peripheral cavity communicates with the toilet bowl 101 through this gap; the gap between the upper surface of the roller shutter partition 4 and the lower surface of the seat body 1 is sealed by the sealing lip 12 at the edge of the central opening 11, and the gap outside the sealing lip 12 also belongs to the peripheral cavity. The storage cavity 2 opens downwards into the surrounding cavity through the vent 24 at the rear corner of the base plate, thus the storage cavity 2 is an extension of the enclosed space 106. At the outlet seam 21, the upper and lower sides of the roller shutter partition 4 are respectively fitted by the front upper scraper 221, the rear upper scraper 224, and the lower scraper 222. Below the rising section of the roller shutter partition 4 is the inner cavity of the washing tray 27, whose front opening is sealed by the front baffle 223 and only leads to the toilet bowl 101 through the drain nozzle 271, also belonging to the enclosed space 106. After the washing tray 27, the space above the ceramic countertop below the base plate of the storage cavity 2 is closed by the transverse section of the skirt 14. The storage cavity 2 has no other openings to the outside; therefore, the one-way air inlet valve 71 and the filter exhaust valve 72 on top of the storage cavity 2 constitute the only controlled ventilation path in the enclosed space 106. The flow area of ​​each side of the vent 24 is approximately 3 cm². 2 The gap area below guide rail 6 is approximately 100 cm². 2 All of them are much larger than the flow area of ​​the intake check valve 71, and do not affect the operation of the ventilation assembly 7.

[0040] like Figure 2 and Figure 8As shown, the drive mechanism 8 includes a motor 81, an electromagnetic clutch 821, a rope pulley 82, a manual release button 822, two traction ropes 83, two guide wheels 84, and a limit switch 85. The motor 81 is a 12 V DC geared motor with a rated speed of approximately 300 r / min. It is installed behind the roller 3 inside the storage cavity 2, with its axis running in the front-to-back direction. The rope pulley 82 has a diameter of 18 mm and is coaxially connected to the motor 81 via the electromagnetic clutch 821. The electromagnetic clutch 821 is an energized type; when energized, the motor 81 drives the rope pulley 82, and when de-energized, the rope pulley 82 disengages from the motor 81 and can rotate freely. The manual release button 822 is located on the side wall of the storage cavity 2. When pressed, it mechanically disengages the electromagnetic clutch 821 via a shift fork. The two traction ropes 83 are aramid threads with a diameter of 0.8 mm. One end is fixed to the rope pulley 82, and they extend forward along the outer side of the two guide rails 6, pass over the guide wheels 84 located on both sides of the front end of the seat ring body 1, and then connect to the two ends of the traction rod 5. When motor 81 rotates forward, pulley 82 retracts the rope, pulling rod 5 forward. The roller shutter partition 4 unfolds from the roller shaft 3 and slides forward along guide rail 6, a distance of approximately 380 mm, taking about 1.3 seconds. Upon reaching the desired position, pulley 5 abuts against front stop 16 and triggers limit switch 85. When controller 9 de-energizes electromagnetic clutch 821, pulley 82 disengages, and return spring 31 reverses the roller shaft 3, retracting the roller shutter partition 4. Pull rope 83 is then released from pulley 82, with the rewind speed limited by rotation damper 32. In the event of a power outage, electromagnetic clutch 821 also disengages, and roller shutter partition 4 automatically retracts, restoring the toilet to usability. The required pulling force for unfolding is approximately 18 N, corresponding to an output torque of approximately 0.16 N·m for motor 81. The stall torque of motor 81 is not less than 0.5 N·m, and each operation consumes approximately 10 J of power.

[0041] The controller 9, comprising a microcontroller, a motor drive circuit, and a current detection circuit, is installed inside the receiving cavity 2. It is electrically connected to the button 91, a capacitive seat occupancy sensor 92 located on the seat body 1, a limit switch 85, a motor 81, an electromagnetic clutch 821, a cleaning solenoid valve 19, an ultraviolet lamp 25, a cavity cover switch 26, a status indicator light 95, and a pressing actuator 93. It is powered by a power supply 94, which is either a three-cell lithium-ion battery located inside the receiving cavity 2 or an external 12V adapter. When the battery voltage is below a threshold, the controller 9 is prevented from opening, and this is indicated by the status indicator light 95. The cavity cover switch 26 is a microswitch on the cavity cover 23; when the cavity cover 23 is opened, it cuts off the power supply to the ultraviolet lamp 25 and the motor 81. The status indicator light 95 is a tri-color LED on the cavity cover 23, indicating standby, working, and filter replacement 721 states. The latter is indicated by the controller 9 counting the number of flushes, with a default of 500 flushes before prompting a replacement. The push actuator 93 is a small servo motor with a push rod, which is attached to the existing flush button 104 on the water tank 103. When controlled, the push rod presses down the flush button 104.

[0042] The working process of this embodiment is as follows: Normally, the roller shutter partition 4 is wound on the roller 3 and stored in the storage cavity 2, with the central opening 11 unobstructed, and the seat ring assembly is no different from an ordinary seat ring. After the user finishes using the toilet and gets up, they press the button 91. The controller 9 confirms that the seat ring occupancy sensor 92 has not detected anyone, and the drive motor 81 causes the roller shutter partition 4 to unfold. After the traction rod 5 is in place, the limit switch 85 closes. At this time, the roller shutter partition 4 covers the area below the central opening 11, and its upper surface contacts the sealing lip 12, forming a closed space 106 with the seat ring body 1, skirt 14, toilet bowl opening 102, and toilet bowl 101. The controller 9 then controls the pressing actuator 93 to press down the flush button 104. During the water filling stage, the water level in the toilet bowl 101 rises, the air in the enclosed space 106 is compressed, and the pressure rises to the opening pressure difference of the exhaust valve plate 722. The air is then discharged through the filter element 721, and the droplets and aerosols in the flushing plume are trapped by the filter element 721. The peak positive pressure in the enclosed space 106 is about 350 Pa. During the siphon stage, the water level drops sharply and the trap 105 needs to swallow air to disconnect the siphon. After the pressure in the enclosed space 106 drops below the opening pressure difference of the air inlet check valve 71, external air enters. The peak negative pressure is about 330 Pa, and the siphon disconnects normally. After flushing, controller 9 keeps the roller shutter partition 4 open for 30 seconds, allowing the droplets in the plume to settle back to the water surface. Then, controller 9 opens the cleaning solenoid valve 19 and de-energizes the electromagnetic clutch 821. Under the action of the rewind spring 31, the roller shutter partition 4 retracts at a speed limited by the rotation damper 32. During the retraction process, as the curtain passes through the outlet seam 21, it passes through the front baffle 223 and the front upper scraper 221 in sequence. Then, its lower surface is washed by the jet impact of the cleaning nozzle 17 through the spray area. Immediately afterwards, the lower scraper 222 and the rear upper scraper 224, which are arranged opposite to each other along the rear edge of the outlet seam 21, scrape the upper and lower surfaces clean. The jet water and the scraped water fall into the cleaning tray 27 and fall into the toilet bowl 101 from the inner edge of the toilet bowl opening 102 through the drain nozzle 271. After retracting into place, the cleaning solenoid valve 19 closes and the ultraviolet lamp 25 is lit for 90 seconds to disinfect the rolled-up roller shutter partition 4.

[0043] Example 2: Figure 9 As shown, this embodiment provides a toilet flushing control method applied to the seat ring assembly described in Embodiment 1, which is executed by the controller 9 and includes the following steps.

[0044] S1. Receive flush command. The flush command comes from button 91, or from the infrared seat-off sensor or wireless remote control.

[0045] S2. Detect seat occupancy status. Read the seat occupancy sensor 92. If someone is detected in the seat, do not execute the subsequent steps and alert via indicator light or sound; otherwise, proceed to step S3.

[0046] S3. Control the drive mechanism 8 to unfold the roller shutter partition 4. The electromagnetic clutch 821 is energized and engaged, the motor 81 rotates forward, the traction rod 5 slides forward along the guide rail 6, and the roller shutter partition 4 covers the area below the central opening 11. During the unfolding process, the controller 9 monitors the current of the motor 81. If the current exceeds a preset threshold, it is determined to be clamped or blocked. This threshold is calibrated as 1.3–1.5 times the unloaded unfolding current measured after the whole machine is assembled (in this embodiment, the unloaded unfolding tension is about 18 N, and the corresponding triggering tension is about 25 N). Immediately, the electromagnetic clutch 821 is de-energized, the roller shutter partition 4 rolls back, and the status indicator light 95 indicates this.

[0047] S4. Confirm in place. Check whether the limit switch 85 is closed within the predetermined time limit, which is 3–5 seconds; if it is closed, proceed to step S5; if it is not closed within the time limit, the motor 81 will be released, an alarm will be triggered, and the process will end.

[0048] S5. Trigger flushing. Control the press actuator 93 to press the flush button 104; during flushing, outside air enters the closed space 106 through the air inlet check valve 71, and the air in the closed space 106 is discharged only through the filter exhaust valve 72.

[0049] S6. Keep closed. After flushing, keep the roller shutter partition 4 open for a predetermined time, which is 15–60 seconds. In this embodiment, it is 30 seconds.

[0050] S7. Cleaning, retraction, and disinfection. Open the cleaning solenoid valve 19. After 0.4 seconds, the electromagnetic clutch 821 is de-energized and disengaged. Under the action of the retraction spring 31, the roller shutter partition 4 retracts into the storage cavity 2 at a speed limited by the rotation damper 32. During the retraction process, the curtain surface passes through the front baffle 223 and the front upper scraper 221 at the outlet seam 21, and then through the spray area of ​​the cleaning nozzle 17. Subsequently, the lower scraper 222 and the rear upper scraper 224 scrape the upper and lower surfaces clean. The cleaning water is discharged into the toilet bowl 101 through the cleaning tray 27 and the drain nozzle 271. After retraction, close the cleaning solenoid valve 19 after 0.5 seconds. The water spray lasts for about 2.2 seconds and consumes about 0.11 L of water. Then, the ultraviolet lamp 25 is lit for 90 seconds (which can be set within 60–120 seconds). The process ends.

[0051] Example 3: This example verifies the function of the ventilation component 7 through lumped parameter simulation. The simulation model uses the water level in the pool, the air volume in the enclosed space 106, and the standard air volume converted to atmospheric pressure as state variables. The gauge pressure in the enclosed space 106 is calculated based on isothermal relationships. The water circuit is set as follows: a 6 L water tank discharges water within 3.5 s using a triangular flow curve; the siphon starts when the water level is 3.5 cm above the resting position, with a siphon flow rate of 2.2 L / s; when the water level is 2 cm below the resting position, the water trap 105 absorbs 0.4 L of air at 1.5 L / s, then the siphon disconnects, and subsequently replenishes water at 0.15 L / s. The air inlet check valve 71 in the air circuit is calculated according to the orifice formula, with a flow coefficient of 0.62 and a flow area of ​​3 cm². 2 The opening pressure difference is 150 Pa. The filter exhaust valve 72 is calculated based on linear resistance, 120 cm. 2 The filter element has a pressure drop of 300 Pa at a flow rate of 3 L / s, an opening differential pressure of 50 Pa, and a sealing leakage of 0.3 cm. 2 Equivalent orifice calculation; toilet water surface area 0.045 m² 2 The air volume in the enclosed space of 106 when at rest is 8 L, and the area of ​​the toilet bowl opening is 0.084 m². 2 .

[0052] The three ventilation schemes were compared under the same waterway conditions, and the results are shown in Table 1 and... Figure 10 As shown.

[0053] completely sealed 33.0 kPa 20.2 kPa 2772 N The seal failed during the positive pressure stage. Only one-way valve for intake is provided 10.5 kPa 334 Pa 884 N yes This invention 348 Pa 334 Pa 29 N yes As shown in Table 1, the positive pressure during the water injection stage can only be released through the outward exhaust path. The positive pressure peak of the scheme with only an intake one-way valve still exceeds 10 kPa, and the baffle is subjected to a force of nearly 900 N. In fact, unfiltered aerosols will inevitably leak from the seal. The scheme of the present invention controls the pressure within ±350 Pa throughout the process, the baffle is subjected to a force of 29 N, and the siphon is normally disconnected.

[0054] Further scanning of the windward area of ​​filter element 721 was performed, with the area ranging from 30 cm². 2 Increased to 120 cm 2 As the peak positive pressure decreases from the kPa level to below 350 Pa, further increases yield diminishing returns; therefore, 120 cm⁻¹ is preferred. 2 The flow area of ​​the intake check valve 71 was scanned; the area was 1 cm². 2 The peak negative pressure reached 1.35 kPa, 2 cm 2 The pressure dropped to 533 Pa, 3 cm 2 When the pressure drops to 334 Pa, further increases in pressure result in diminishing returns; therefore, a minimum pressure of 2 cm is required. 2 3 cm is preferred 2For the pressure flush valves commonly used in public restrooms, i.e., 6 L is released within 1.2 seconds, and 120 cm... 2 The peak positive pressure under the filter element is 862 Pa, increasing the frontal area of ​​filter element 721 to 240 cm². 2 The flow area of ​​the intake one-way valve 71 has been increased to 6 cm². 2 The pressure subsequently dropped to 467 Pa, therefore the ventilation component 7 should be upgraded in the public restroom implementation.

[0055] Example 4: This example illustrates the material selection for the slat 41. The slat 41 is supported at both ends by guide rails 6. Calculated as a simply supported beam, the span is 310 mm, and the uniformly distributed load is the design pressure of 300 Pa multiplied by the pitch of 8 mm, which is 2.4 N / m. The maximum deflection of slats of different materials and thicknesses under 300 Pa is shown in Table 2.

[0056] polypropylene 1.5 GPa 92 mm 39 mm 20 mm ABS 2.3 GPa 60 mm 25 mm 13 mm polycarbonate 2.4 GPa 58 mm 24 mm 12 mm 6063 aluminum alloy 69 GPa 2.0 mm 0.85 mm 0.43 mm 304 stainless steel 193 GPa 0.72 mm 0.30 mm 0.16 mm Plastic slats have a deflection of tens of millimeters, which would cause them to detach from the guide rail 6 with a groove height of 8 mm, making them unsuitable. 2 mm thick aluminum alloy slats have a deflection of 0.85 mm, meeting the allowable value of no more than 2 mm, and their rolled-up outer diameter of approximately 42 mm can be accommodated within the storage cavity 2. Stainless steel slats are stiffer but heavier and more expensive. Therefore, aluminum alloy slats 41 with a thickness of 1.5–2.5 mm are preferred.

[0057] Example 5: This example is a manual implementation. The difference from Example 1 is that it omits the motor 81, electromagnetic clutch 821, pulley 82, and controller 9. Instead, a manual lever is installed on one side of the seat ring body 1. The manual lever is connected to the traction rod 5 via a steel wire rope. The user pulls the manual lever to unfold the roller blind partition 4, which is then locked by a pawl. The user then manually presses the flush button 104. The rotation damper 32 at one end of the roller shaft 3 has a large damping capacity. The pawl is released by a timed release mechanism after 15–60 seconds, and the roller blind partition 4 slowly retracts under the action of the return spring 31. This example does not require a power source and is suitable for locations without a power supply.

[0058] Example 6: This example is a public restroom example, differing from Example 1 in that: the seat ring body 1 is fixedly installed on the toilet bowl opening rim 102; the flushing command comes from an infrared seat-leaking sensor; the press actuator 93 is replaced by a trigger signal output electrically connected to the sensor-operated flush valve; and because the pressure flush valve has a higher water discharge speed than a tank-type toilet, the airflow area of ​​the filter element 721 is increased to 240 cm². 2 The flow area of ​​the intake check valve 71 has been increased to 6 cm². 2 The size of storage cavity 2 is increased accordingly.

[0059] Example 7: This example is a comparative example. The filter exhaust valve 72 from Example 1 is blocked, leaving only the intake check valve 71, which is equivalent to the prior art scheme of a seat seal plus an inward check valve. Simulation shows that the positive pressure peak during the water injection stage reaches 10.5 kPa, the baffle plate experiences a force of 884 N, and the sealing lip 12 and skirt 14 will be pushed open during the positive pressure stage, allowing aerosols to escape unfiltered with the leaking airflow. Then, the intake check valve 71 is also blocked, resulting in a completely sealed scheme. The positive pressure peak reaches 33 kPa, the negative pressure peak reaches 20 kPa, and approximately 5 kPa of negative pressure remains in the enclosed space 106 after flushing. Both comparative examples cannot be implemented, indicating that separating the intake path and the filter exhaust path is a necessary condition for the implementation of this invention.

[0060] Example 8: This example combines Figure 12This section explains the design rationale behind the curtain cleaning structure. When the roller shutter partition 4 is unfolded, its lower surface faces the flushing jet. Larger droplets in the jet will impact and adhere to the curtain surface. If left untreated, visible stains and microbial growth will appear on the curtain surface after long-term use. This is a problem that any solution that seals the toilet bowl opening with a cover or panel must address. First, two abandoned arrangements are explained. One is to install a nozzle at the front of the seat ring, flushing backwards with a water film along the curtain surface: The lower surface of the curtain is downward and hydrophobic, so the water film cannot adhere to it. The water film, ejected at 1–3 m / s, advances 30–100 mm under gravity before detaching from the curtain and falling, only covering a small section at the front of the curtain. Increasing the flow rate or volume would only increase water consumption and splashing. Secondly, a horizontal spray bar and a wiper lip are installed in front of the inner edge of the toilet bowl opening 102, so that the curtain passes over it when it is retracted: the top surface of the toilet bowl opening 102 is about 20 mm from the lower surface of the seat body 1 and about 15 mm from the lower surface of the rolled-up curtain partition 4 after it is unfolded. The central opening 11 narrows rapidly behind it. Near the inner edge of the toilet bowl opening 102, only a width of about 50 mm on each side of the center line is above the toilet bowl 101. The remaining width of the spray bar will interfere with the top surface of the opening. The water scraped off by the horizontally arranged wiper lip will also fall on the top surface of the opening and accumulate below the seat. This invention thus allows the curtain to actively pass through the cleaning chamber located below the outlet slit 21 when it passes through the outlet slit 21: the cleaning nozzle 17 is a transverse spray pipe on the bottom plate of the cleaning tray 27, with eleven deflector-type fan-shaped nozzles of 1.0 mm diameter arranged at 25 mm intervals, the outermost two being 125 mm from the center, pointing towards the lower surface of the rising section, with a range of about 17 mm, and the coverage width of the jet on the curtain surface is about 34 mm, with the coverage areas of adjacent nozzles overlapping by about 8.5 mm, and the ends covering to about 142 mm from the center; according to the nominal fan angle of 110°, it only reaches about 149 mm, all within the end face (155 mm) of the curtain slat 41, preventing the jet from crossing the end of the curtain slat and entering the receiving chamber 2 through the end gap of the outlet slit 21; a 3 L / min pressure-compensated constant flow restrictor is installed before the cleaning solenoid valve 19, the pressure before the nozzle is about 0.04 MPa, the jet velocity is about 9 m / s, and the stagnation pressure of the jet impacting the curtain surface is about 40. kPa; the roller shutter partition 4 retracts at a speed not exceeding 0.3 m / s, and any surface element on the curtain surface reaches the lower scraper lip 222 approximately 0.03 s after passing through the spray zone. After the jet impacts the curtain surface, it forms a wall jet along the curtain surface. Based on the contact angle hysteresis estimation, the retention force on a 1 mm diameter droplet on the curtain surface is approximately 24 μN, while the drag force of the jet on the impact line is approximately 15400 μN, which is more than 600 times the retention force. Even when the wall jet decays to one-tenth of the impact velocity (approximately 10 mm from the impact line), it is still approximately six times the retention force, which is sufficient to remove the attached droplets and fresh dirt. The water remaining on the curtain surface is then scraped off simultaneously from the outlet slit 21 along the upper and lower surfaces of the oppositely arranged lower scraper lip 222 and upper scraper lip 224.The positioning sequence of the four wiping lips is a key point of this embodiment: the curtain surface passes sequentially through the front baffle 223, the front upper wiping lip 221, the spray zone, the lower wiping lip 222, and the rear upper wiping lip 224, i.e., rinsing first, then wiping dry, and finally entering the collection cavity 2; the flexible backing layer 42 is continuously attached to the upper surface of the curtain slats 41, sealing the 0.6 mm gap between the curtain slats, preventing the jet water from penetrating to the upper surface through the gap, while the small amount of water that comes up from the end of the curtain slats is scraped off by the rear upper wiping lip 224. The scraped water and the jet water fall together into the washing tray 27, collect along the inclined bottom plate to the drain nozzle 271, and fall from the inner edge of the toilet bowl opening 102 into the toilet bowl 101, without splashing onto the outside of the toilet bowl, the top surface of the opening, or the ceramic countertop, and without entering the collection cavity 2; the front baffle lip 223 blocks the water flowing forward along the curtain surface, causing it to fall back into the washing tray 27 as well. The water spraying time is approximately 2.2 seconds, from 0.4 seconds before the start of retraction to 0.5 seconds after retraction. Each spray consumes approximately 0.11 L of water, which is less than 2% of the total water volume for a single flush. The hydrophobic layer 44 increases the water contact angle from approximately 70° of the aluminum alloy itself to over 110°. The water on the curtain surface forms spherical droplets, which are easily carried away by the jet and scraped clean by the scraper lip, ensuring that the curtain surface is basically dry when it enters the storage cavity 2. The ultraviolet lamp 25 consists of six 275 nm ultraviolet light-emitting diodes with a radiation power of 20 mW evenly distributed along the direction of the roller spool 3. It is located approximately 15 mm from the surface of the rolled-up curtain partition 4. Based on the Lambert radiation, the irradiance directly below the lamp is estimated to be approximately 2.8 mW / cm. 2 The dose after 90 seconds of illumination is approximately 250 mJ / cm². 2 The dose at the surface between two adjacent lamps is approximately 27 mJ / cm. 2 Approximately 24 mJ / cm at both ends of the roll 2 All of these levels are higher than the approximately 10 mJ / cm³ required for common bacteria such as Escherichia coli and Staphylococcus aureus to achieve 99.9% inactivation. 2 The number of UV lamps 25 can be selected between 2 and 8 depending on the length of the roller 3, and they only illuminate when the cover 23 of the storage cavity 2 is closed and the roller shutter partition 4 is retracted. Furthermore, the roller shutter box formed by the roller 3 and the roller shutter partition 4 can be pulled out entirely from the storage cavity 2, the cleaning tray 27 can be pulled forward, and the four squeegee lips can be individually removed and replaced. Users can periodically remove and rinse them with water. Of the above measures, the cleaning nozzle 17, squeegee lips 22, and cleaning tray 27 are the primary means, while the others are supplementary means, and their combination can be selected according to cost.

[0061] Example 9: This example illustrates other problems in actual use and the countermeasures of the present invention. Each countermeasure can be applied individually or in combination to Example 1.

[0062] Firstly, fail-safe. If the roller shutter partition 4 remains in the unfolded position due to a power outage, motor damage, or controller malfunction, the toilet will be unusable. In this invention, the retraction of the roller shutter partition 4 is entirely driven by the return spring 31. The motor 81 only performs work in the unfolding direction and is driven by the electromagnetic clutch 821, which is disconnected by power failure. Any electrical fault will cause the electromagnetic clutch 821 to disengage and the roller shutter partition 4 to retract automatically; the manual release button 822 provides a final mechanical means. If the roller shutter partition 4 is stuck by a foreign object during the unfolding process, the motor current protection will also cause it to retract.

[0063] Secondly, to prevent bypassing. If the flush button 104 on the water tank 103 is pressed directly, the roller shutter partition 4 will not unfold. In this embodiment, the mounting bracket of the press actuator 93 covers the flush button 104, and the user can only trigger flushing through the button 91 on the seat body 1, the remote control, or the seat-off sensor. Flushing must take place after the roller shutter partition 4 unfolds. For a dual-button water tank, the press actuator 93 acts on the large flush button, and the small flush is triggered by pressing and holding the button 91.

[0064] Thirdly, filter element maintenance. As dust accumulates on filter element 721, the pressure drop increases, and the positive pressure rises accordingly during water filling. When this pressure reaches a certain level, leakage will occur at the sealing lip 12 and skirt 14. The controller 9 counts the number of flushes, with a default value of 500 flushes (approximately six months for a household). After this, the status indicator 95 will prompt for replacement. Filter element 721 can be removed from the chamber cover 23 for replacement without tools. Alternatively, a differential pressure sensor can be installed in the storage chamber 2 to prompt for replacement when the peak positive pressure during water filling exceeds 600 Pa.

[0065] Fourth, UV safety. The UV lamp 25 is only lit when the roller shutter partition 4 is retracted and the cavity cover 23 is closed, and the cavity cover switch 26 cuts off the power supply when the cavity cover 23 is opened; the storage cavity 2 is opaque, and ultraviolet rays do not leak out.

[0066] Fifth, the toilet seat size is suitable. The seat body 1 is made in two specifications: extended and standard. The central opening 11 is 280 mm × 380 mm and 270 mm × 340 mm respectively, and the length of the guide rail 6 and the roller shutter partition 4 is shortened accordingly. The skirt 14 can be compressed by 5 mm, and the sealing lip 12 is an elastic lip to absorb the differences in the shape and height of different toilet bowl openings. The hole spacing of the hinge mounting holes 15 is adjustable within 140–160 mm. Before installation, it should be confirmed that there is a ceramic countertop with a width of not less than 400 mm below the receiving cavity 2 (after the toilet bowl opening 102) to support the skirt 14 and the support legs 13. If the rear ceramic surface is narrower than this, the standard specification should be used or a conformal compensation pad should be added to the outside of the skirt 14 to ensure the sealing of the surrounding cavity.

[0067] Sixth, compatibility with toilet seats and cleaning. The hinge mounting hole 15 can be used to install a regular seat plate at the same time, and the seat plate and the roller shutter partition 4 do not interfere with each other; the seat body 1 adopts a quick-release hinge, which can be lifted or removed as a whole to clean the lower surface, guide rail 6 and sealing lip 12; the roller shutter box formed by the roller spool 3 and the roller shutter partition 4 wound on it can be pulled out of the storage cavity 2 as a whole for washing, the cleaning tray 27 can be pulled forward, and the squeegee lips 221, 222 and the front lip 223 can be removed and replaced individually.

[0068] Seventh, lifespan and low power consumption. The roller shutter partition 4 is designed for 30,000 opening and closing cycles, approximately 8 years based on 10 uses per day; the flexible backing layer 42 has a bending resistance of no less than 100,000 cycles; the retraction spring 31 and rotation damper 32 are common components for furniture roller shutters. When powered by battery, if the battery voltage is below the threshold, the controller 9 will prevent opening, keep the roller shutter partition 4 retracted, and indicate this with the status indicator 95, ensuring the toilet is always usable.

[0069] Eighth, the distance from the front wall of the water tank. The distance from the rear wall of the storage cavity 2 to the center of the hinge mounting hole 15 is about 100 mm, which is comparable to the commercially available smart seat ring. Before installation, it is necessary to check that the distance from the center of the hinge hole to the front wall of the water tank is not less than 105 mm. If it is insufficient, a short box model with a 20 mm shorter rear wall and a corresponding forward movement of the roller 3 can be selected.

[0070] Ninth, in situations where there is no cleaning water source. If the cleaning water pipe 18 cannot be drawn from the water tank inlet valve, the cleaning nozzle 17 and the cleaning solenoid valve 19 can be omitted, while retaining the hydrophobic layer 44, the squeegee lip 22, the cleaning tray 27, the ultraviolet lamp 25, and the removable roller shutter box. The cleaning effect will be reduced, but it will still be usable.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. All modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An anti-aerosol toilet seat assembly, comprising a seat body (1) having a central opening (11) for the passage of excrement, characterized in that, Also includes: A storage cavity (2) is located at the rear of the seat body (1); a roller blind partition (4) is a rollable sheet, one end of which is wound around a roller (3) located in the storage cavity (2), and the other end is connected to a traction rod (5); two parallel guide rails (6) are located on the lower surface of the seat body (1) and on both sides of the central opening (11), and the two ends of the traction rod (5) slide along the two guide rails (6) respectively, so that the roller blind partition (4) can unfold from the storage cavity (2) to the front end of the seat body (1) and cover the lower part of the central opening (11), or retract into the storage cavity (2); a drive mechanism (8) is connected to the storage cavity (2); and a roller blind partition (4) is connected to the seat body (1) at the rear of the seat body (1). The traction rod (5) is connected to drive the roller shutter partition (4) to unfold and retract; and the ventilation assembly (7) includes an air inlet check valve (71) and a filter exhaust valve (72). The air inlet check valve (71) only allows external air to enter the enclosed space (106). The enclosed space (106) is the space formed by the lower surface of the roller shutter partition (4), the seat body (1), and the toilet bowl (101) and the toilet bowl opening edge (102) after the roller shutter partition (4) is unfolded. The filter exhaust valve (72) includes a filter element (721) and an exhaust valve plate (722), which only allows the air in the enclosed space (106) to be filtered by the filter element (721) and then discharged.

2. The anti-aerosol toilet seat assembly according to claim 1, characterized in that, The lower surface of the seat body (1) is provided with an elastic sealing lip (12) on the outer circumference of the central opening (11), and the lower end of the sealing lip (12) contacts the upper surface of the rolled-up curtain partition (4) after unfolding; the lower surface of the seat body (1) is provided with an elastic skirt (14), and the lower end of the skirt (14) is used to contact the toilet bowl opening edge (102).

3. The anti-aerosol toilet seat assembly according to claim 1, characterized in that, The roller blind partition (4) includes multiple parallel slats (41) and a flexible backing layer (42) connecting each slat (41). The slats (41) are metal slats, and each slat (41) has flanges (43) at both ends. The guide rail (6) has a C-shaped groove (61) with its opening facing the central opening (11). The bottom of the C-shaped groove (61) has an inwardly folded bottom lip (62). The flanges (43) extend into the C-shaped groove (61) and are supported by the bottom lip (62).

4. The anti-aerosol toilet seat assembly according to claim 3, characterized in that, The slats (41) are aluminum alloy slats with a width of 6–10 mm and a thickness of 1.5–2.5 mm, and the pitch between adjacent slats (41) is 7–11 mm; the flexible backing layer (42) is a thermoplastic polyurethane film with a thickness of 0.3–0.8 mm, which is attached to the side of each slat (41) facing the seat body (1).

5. The anti-aerosol toilet seat assembly according to claim 1, characterized in that, The outer contour of the seat body (1) is a superellipse with an index of 4–6, so that the two guide rails (6) are located within the lower surface of the seat body (1) along their entire length.

6. The anti-aerosol toilet seat assembly according to claim 1, characterized in that, It also includes a controller (9) and a push-button actuator (93) for triggering toilet flushing. The controller (9) is electrically connected to the drive mechanism (8) and the push-button actuator (93). The controller (9) is configured to: upon receiving a flushing command, first control the drive mechanism (8) to unfold the roller shutter partition (4) into place, then control the push-button actuator (93) to trigger flushing, and after flushing, keep the roller shutter partition (4) unfolded for a predetermined time, and then control the drive mechanism (8) to retract the roller shutter partition (4); the predetermined time is 15–60 s.

7. The anti-aerosol toilet seat assembly according to claim 6, characterized in that, It also includes a seat occupancy sensor (92) located on the seat body (1) and a limit switch (85) located at the end of the travel of the traction rod (5). The seat occupancy sensor (92) and the limit switch (85) are both electrically connected to the controller (9). The controller (9) does not control the roller shutter partition (4) to unfold when the seat occupancy sensor (92) detects that someone is in the seat, and only controls the pressing actuator (93) to trigger flushing after the limit switch (85) is closed. The drive mechanism (8) includes a motor (81). The controller (9) is also configured to monitor the current of the motor (81) during the unfolding of the roller shutter partition (4). When the current exceeds a preset threshold, the unfolding is stopped and the roller shutter partition (4) is retracted.

8. The anti-aerosol toilet seat assembly according to claim 1, characterized in that, The bottom plate of the storage cavity (2) is provided with an outlet slit (21) for the roller blind partition (4) to enter and exit. The roller blind partition (4) is inclined upward from the rear edge of the central opening (11) and passes through the outlet slit (21) and is wound around the roller (3). The front edge of the outlet slit (21) is provided with a front upper scraper lip (221) that contacts the upper surface of the roller blind partition (4). The rear edge of the outlet slit (21) is provided with a lower scraper lip (222) and a rear upper scraper lip arranged opposite to each other. The lower scraper lip (222) contacts the lower surface of the roller shutter partition (4), and the upper rear scraper lip (224) contacts the upper surface of the roller shutter partition (4); a cleaning tray (27) is provided below the storage cavity (2) and located below the outlet seam (21). The front edge of the cleaning tray (27) is provided with a front lip (223) that contacts the lower surface of the roller shutter partition (4), and the bottom of the cleaning tray (27) is provided with a forward-extending lip. The drain nozzle (271) is located within the inner edge of the toilet bowl opening (102) of the toilet bowl. The inner cavity of the cleaning tray (27) is connected to the toilet bowl (101) of the toilet bowl through the drain nozzle (271). The roller (3), the supports at both ends of the roller (3), and the roller blind partition (4) wound on it constitute a roller blind box that can be pulled out of the storage cavity (2) as a whole. The front upper scraper lip (221), the lower scraper lip (222), and the rear upper scraper lip are connected to the inner edge of the toilet bowl opening (102). The scraper (224) is respectively embedded in the mounting groove on the bottom plate of the storage cavity (2) and is not pulled out with the roller shutter box; the drain nozzle (271) is an inclined groove that extends forward and downward from the bottom of the front wall of the cleaning tray (27), and the lower edge of its outlet is provided with a drip edge; the inner cavity of the cleaning tray (27) is provided with a front-to-back through conduit, and the traction rope (83) of the drive mechanism (8) passes through the conduit and is separated from the inner cavity of the cleaning tray (27).

9. The anti-aerosol toilet seat assembly according to claim 1, characterized in that, The intake check valve (71) and the filter exhaust valve (72) are both located on the receiving cavity (2). The bottom plate of the receiving cavity (2) is provided with a vent (24) located outside the guide rail (6) and opening downward on the lower surface of the seat body (1). The receiving cavity (2) is connected to the closed space (106) through the vent (24) and the space below the seat body (1). The opening pressure difference of the intake check valve (71) is 100–300 Pa and the flow area is not less than 2 cm. 2 The filter element (721) is a pleated filter cartridge with a filtration efficiency of not less than H11, and its airflow area is 60–240 cm². 2 The pressure drop is no more than 300 Pa at an air flow rate of 3 L / s; the opening pressure difference of the exhaust valve plate (722) is 20–100 Pa.

10. The anti-aerosol toilet seat assembly according to claim 1, characterized in that, The reel (3) is provided with a rewind spring (31), and one end of the reel (3) is provided with a rotation damper (32) to limit the rewind speed; the drive mechanism (8) includes a motor (81), an electromagnetic clutch (821), a rope wheel (82), a traction rope (83), and guide wheels (84) located on both sides of the front end of the seat ring body (1). The motor (81) drives the rope wheel (82) through the electromagnetic clutch (821). The electromagnetic clutch (821) is energized and disengaged when de-energized. One end of the traction rope (83) is fixed to the rope wheel (82), and the other end passes around the guide wheel (84) and is connected to the traction rod (5). The motor (81) only does work in the unfolding direction, and the retraction is completed by the rewind spring (31); the side wall of the storage cavity (2) is provided with a manual release button (822). The manual release button (822) is mechanically linked with the electromagnetic clutch (821) to disengage the electromagnetic clutch (821).

11. The anti-aerosol toilet seat assembly according to claim 8, characterized in that, It also includes a cleaning nozzle (17), which is disposed on the cleaning tray (27) and located below the outlet slit (21). The cleaning nozzle (17) includes a spray pipe extending along the width direction of the roller shutter partition (4) and a plurality of fan-shaped nozzles distributed along the length direction of the spray pipe. The outlet of each fan-shaped nozzle faces the lower surface of the roller shutter partition (4) that passes through the outlet slit (21). The spray area of ​​the fan-shaped nozzle is located behind the front upper scraper lip (221), the lower scraper lip (222), and the rear upper scraper lip in the retraction direction of the roller shutter partition (4). Before scraping the lip (224), the spray area of ​​the fan-shaped nozzle is located between the two end faces of the roller shutter partition (4) in the width direction; the cleaning nozzle (17) is connected to the cleaning solenoid valve (19) through the cleaning water pipe (18), and the cleaning water pipe (18) is provided with a check valve and a vacuum breaker with an air inlet higher than the toilet bowl opening edge (102) of the toilet bowl downstream of the cleaning solenoid valve (19); the lower surface of the roller shutter partition (4) is provided with a hydrophobic layer (44), and the water contact angle of the hydrophobic layer (44) is not less than 110°.

12. The anti-aerosol toilet seat assembly according to claim 1, characterized in that, The top of the storage cavity (2) is provided with a removable cavity cover (23). The storage cavity (2) is provided with an ultraviolet lamp (25) facing the roller shutter partition (4) wound on the roller (3). The cavity cover (23) is provided with a cavity cover switch (26) connected in series in the power supply circuit of the ultraviolet lamp (25) and cutting off the power supply when the cavity cover (23) is opened.

13. A toilet seat, characterized in that, The toilet includes a toilet bowl (101) and an anti-aerosol toilet seat assembly according to any one of claims 1 to 12, wherein the seat body (1) is mounted on the toilet bowl opening edge (102) of the toilet bowl (101).

14. A toilet flushing control method, applied to the anti-aerosol toilet seat assembly of claim 1, wherein the anti-aerosol toilet seat assembly further includes a controller (9), a seat occupancy sensor (92) electrically connected to the controller (9), a limit switch (85) disposed at the end of the stroke of the traction rod (5), a push actuator (93) for triggering toilet flushing, a cleaning tray (27) disposed below the outlet seam (21) of the bottom plate of the receiving cavity (2), and a roller shutter partition disposed on the cleaning tray (27) and facing through the outlet seam (21). 4) The cleaning nozzle (17) on the lower surface, the cleaning solenoid valve (19) controlling the water supply of the cleaning nozzle (17), the drain nozzle (271) located at the bottom of the cleaning tray (27) and opening into the toilet bowl (101) of the toilet, the rewind spring (31) located in the roller (3), the motor (81) located in the drive mechanism (8), the electromagnetic clutch (821) connected in series between the motor (81) and the traction rod (5) and driven when energized and disengaged when de-energized, and the ultraviolet lamp (25) located in the storage cavity (2) are characterized in that, Includes the following steps: S1. Receive flushing command; S2. Detect seat occupancy status through the seat occupancy sensor (92). If there is someone in the seat, the process ends and a prompt is given; otherwise, proceed to step S3; S3. Control the drive mechanism (8) to make the roller shutter partition (4) unfold along the guide rail (6) to cover the area below the central opening (11). During the unfolding process, monitor the current of the motor (81). When the current exceeds a preset threshold, stop unfolding and retract the roller shutter partition (4); S4. Detect whether the limit switch (85) is closed to confirm that the roller shutter partition (4) is in place. If it is not in place within a predetermined time limit, an alarm is triggered and the process ends; S5. Control the push actuator (93) to trigger the toilet to flush. During flushing, outside air enters the enclosed space (106) through the air inlet check valve (71), and the air in the enclosed space (106) is discharged only through the filter exhaust valve (72); S6. After flushing, keep the roller shutter partition (4) open for a predetermined time, the predetermined time being 15–60 seconds. S7. Open the cleaning solenoid valve (19) and de-energize the electromagnetic clutch (821) to release the traction rod (5), so that the roller shutter partition (4) is retracted into the storage cavity (2) under the action of the retraction spring (31). During the retraction process, the lower surface of the roller shutter partition (4) passes through the spray area of ​​the cleaning nozzle (17) in sequence when passing through the outlet seam (21). The cleaning water is discharged into the toilet bowl (101) through the cleaning tray (27) and the drain nozzle (271). After the retraction is completed, close the cleaning solenoid valve (19) and turn on the ultraviolet lamp (25) for 60–120s.

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