Intelligent toilet instant heating cleaning assembly with die-casting water and electricity separation and heating method thereof

Abstract

This invention discloses a die-cast water-electricity separation smart toilet instant-heating cleaning component, including a heating chamber, an upper cover, a lower cover, a heating element, a heating switch, a first thermostat, a second thermostat, a temperature sensor, and a controller. The heating chamber has an integrally connected partition plate dividing its interior into an upper flow channel and a lower flow channel. The heating element is embedded in the partition plate, with both ends exposed on the outside of the heating chamber. The operating temperature set by the first thermostat is lower than that set by the second thermostat. The heating chamber, partition plate, upper cover, and lower cover are all made of thermally conductive metal. This invention also provides a heating method for the above-mentioned die-cast water-electricity separation smart toilet instant-heating cleaning component. This invention can extend the water flow path, achieve sufficient heat exchange, completely separate water and electricity, and provide triple temperature control for power-off protection, improving heating efficiency and dry-burning tolerance.

Description

Technical Field

[0001] This invention relates to the field of intelligent toilet heating components, and in particular to a die-cast water-electricity separation intelligent toilet instant heating cleaning component and its heating method. Background Technology

[0002] The existing structure of instant heating devices for smart toilets, such as the invention patent disclosed in authorization announcement number CN207538149U, is a novel instant heating smart toilet seat, including a toilet top cover, a toilet seat ring, a back cover, a base, a circuit control board, and a water flow control mechanism. The water flow control mechanism is located inside the base and includes a water inlet pipe connector with a one-way flow limiter, a water flow heater, a thermostatic valve, a water flow channel control valve, and two bidet nozzles for localized rinsing. The water inlet pipe connector is connected to the water inlet of the water flow heater and one inlet of the thermostatic valve through water pipes. The water outlet of the water flow heater is connected to the other inlet of the thermostatic valve. The water outlet of the thermostatic valve is connected to the inlet of the water flow channel control valve. The two outlets of the water flow channel control valve are respectively connected to the water paths of the two bidet nozzles. The circuit control board is electrically connected to the heating film and the water flow heater.

[0003] The aforementioned new instant-heating smart toilet seat has the following fatal technical flaws: (1) Structural and heat exchange defects: Water flow heaters mostly adopt a straight / simple flow channel design, with a short water flow path and insufficient heat exchange. Under wide flow (500-1000mL / min) and low inlet water temperature (10℃ / 15℃) conditions, the outlet water temperature is difficult to meet the standard and the temperature control accuracy is poor.

[0004] (2) Deadly safety hazards of dry burning: These water flow heaters are mostly exposed, semi-enclosed or simply encapsulated structures, which cannot withstand real dry burning conditions. Once dry burning occurs, the water flow heater will overheat, explode or break within 5 seconds, directly causing serious safety accidents such as leakage and fire, posing a great threat to the personal safety of users.

[0005] (3) Incomplete water and electricity isolation: This type of water flow heater is in direct contact with water. Long-term use is prone to scaling and corrosion, which further reduces heating efficiency and dry burning tolerance. It requires frequent maintenance, has a short service life, and also poses the dual risks of leakage and pipe bursting.

[0006] (4) Temperature control protection is ineffective: Most of the above-mentioned thermostatic valves are single temperature control or non-contact temperature measurement, which have a delayed response and cannot complete the power-off protection within a very short time (within 5 seconds) when dry burning occurs. They cannot avoid the fatal risk of the heating tube bursting or breaking. Summary of the Invention

[0007] The problem to be solved by the present invention is to provide a die-cast water-electricity separation smart toilet instant heating cleaning component and its heating method. This die-cast water-electricity separation smart toilet instant heating cleaning component and its heating method can extend the water flow path, fully exchange heat, completely separate water and electricity, and perform triple temperature control to complete power-off protection, improve heating efficiency and dry burning tolerance.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A die-cast water-electricity separation smart toilet instant-heating cleaning component includes a heating chamber, an upper cover, and a lower cover; characterized in that it further includes a heating element, a heating switch, a first thermostat, a second thermostat, a temperature sensor, and a controller; the inner cavity of the heating chamber is provided with an integrally connected partition plate, which divides the inner cavity of the heating chamber into an upper flow channel cavity and a lower flow channel cavity; the upper cover plate covers the opening of the upper flow channel cavity, and the lower cover plate covers the opening of the lower flow channel cavity; the upper flow channel cavity has an upper meandering flow channel, and the lower flow channel cavity has a lower meandering flow channel; the partition plate has a water passage hole that runs vertically through the upper and lower parts; the side wall of the heating chamber has a water inlet and a water outlet, the water inlet communicating with the water inlet end of the lower meandering flow channel, the water outlet end of the lower meandering flow channel communicating with the water inlet end of the upper meandering flow channel through the water passage hole, and the water outlet end of the upper meandering flow channel communicating with the water outlet; the heating element is embedded in the partition plate. Both ends of the heating element are exposed on the outside of the heating chamber. The upper meandering flow channel has an upper water inlet section and an upper water outlet section in sequence along the water flow direction. The first thermostat, the second thermostat, and the temperature sensor are all mounted on the upper cover plate. The temperature probe of the first thermostat is located in the upper water inlet section, the temperature probe of the second thermostat is located in the upper water outlet section, and the temperature probe of the temperature sensor is located in the upper flow channel cavity and close to the water outlet of the heating chamber. The first thermostat, the second thermostat, the heating element, and the heating switch are connected in series to form a power supply circuit. The signal output terminals of the first thermostat, the second thermostat, and the temperature sensor are electrically connected to the corresponding signal input terminals of the controller, and the heating switch is electrically connected to the corresponding signal output terminal of the controller. The operating temperature set by the first thermostat is lower than the operating temperature set by the second thermostat. The heating chamber, the partition plate, the upper cover plate, and the lower cover plate are all made of thermally conductive metal.

[0009] The first and second temperature controllers are connected in series and then connected to the power supply circuit of the heating element and the heating switch to form a hardware-level forced power-off protection circuit independent of the controller. The temperature sensor is electrically connected to the corresponding signal input terminal of the controller to form a temperature signal detection circuit, thereby realizing software temperature control.

[0010] During manufacturing, the heating chamber and partition plates, made of thermally conductive metal, are formed through a die-casting process. Before die-casting, heating elements are pre-embedded in the mold, and then molten metal is poured into the mold. After the heating chamber and partition plates are die-cast, the heating elements and partition plates are tightly bonded together without gaps or splices, resulting in excellent heat transfer efficiency, high structural strength, and no risk of leakage. This all-metal die-cast structure, with no brittle plastic parts, will not crack due to freezing at temperatures as low as -30°C, making it suitable for use in cold northern regions.

[0011] Because the lower surface of the partition plate serves as the top surface of the lower flow channel cavity, and the upper surface of the partition plate serves as the bottom surface of the upper flow channel cavity, and the heating element is completely embedded and tightly wrapped inside the partition plate, the heating element is completely isolated from the water in the lower and upper meandering flow channels, achieving complete water-electricity separation. The partition plate provides high-strength, high-thermal-conductivity protection for the heating element, completely sealing it off. Even in the event of dry burning, the heat can be quickly dispersed through the metal partition plate and heating chamber, preventing localized overheating of the heating element and mitigating the risk of explosion or breakage during dry burning.

[0012] Before use, preset the operating temperature for the first and second thermostats, and preset the target outlet water temperature for the temperature sensor.

[0013] When in use, connect the power and open the toilet's water valve to heat the heating element and conduct heat to the entire heating chamber. Cold water enters from the inlet at the bottom of the heating chamber and flows from bottom to top and back and forth along the lower meandering channel, the water passage, the upper meandering channel, and the outlet, fully exchanging heat with the entire heating chamber. Finally, hot water flows out from the outlet at the top of the heating chamber. During use, the temperature sensor of the first thermostat is positioned in the water of the upper inlet section, monitoring the water temperature as it enters the upper inlet section in real time. When the actual water temperature of the upper inlet section reaches the operating temperature of the first thermostat, it triggers the contacts of the first thermostat to open, disconnecting the circuit; when the actual water temperature of the upper inlet section drops below the operating temperature of the first thermostat, it triggers the contacts of the first thermostat to close, connecting the circuit. The temperature sensor of the second thermostat is located in the water of the upper outlet section, further monitoring the temperature of the already heated water in the upper outlet section in real time. When the actual water temperature of the upper outlet section reaches the operating temperature of the second thermostat, it triggers the contacts of the second thermostat to permanently disconnect, forcibly cutting off the power supply circuit and preventing automatic reset, thus preventing dry burning and overheating. Meanwhile, the temperature sensor collects the actual water temperature at the outlet of the heating chamber in real time and transmits the actual water temperature signal to the controller. The controller compares the actual water temperature with the target water temperature: if the actual water temperature is higher than the target water temperature, the controller controls the heating switch to open, stopping the heating element from heating; if the actual water temperature is lower than the target water temperature, the controller controls the heating switch to close, resuming heating, thereby controlling the on / off state of the heating element and achieving precise adjustment of the water temperature at the outlet of the heating chamber.

[0014] One end of the heating element is used as the positive electrode and the other end as the negative electrode. The positive and negative electrodes are exposed on the outside of the heating box, which facilitates subsequent connection with the power supply circuit of the smart toilet.

[0015] In the preferred embodiment, both the first and second temperature controllers are mechanical temperature controllers, and the temperature sensor is an NTC temperature sensor. The aforementioned mechanical temperature controller is a temperature control device that uses physical principles such as thermal expansion and contraction to sense temperature and controls the on / off state of the circuit through a mechanical structure. It is simple in structure, reliable and durable, and requires no electronic circuitry. The main types include bimetallic strip and liquid expansion type temperature controllers. The aforementioned NTC temperature sensor is a thermistor probe, and its principle is that the resistance value decreases rapidly as the temperature rises.

[0016] In a further optimized design, the first thermostat is an automatic reset mechanical thermostat, and the second thermostat is a manual reset mechanical thermostat. When the actual water temperature in the upper inlet section drops below the operating temperature of the first thermostat, the contacts of the first thermostat automatically close, restoring power without manual intervention. This, combined with the NTC temperature sensor, achieves constant daily temperature, preventing excessively high water temperatures and ensuring uninterrupted cleaning flow. The second thermostat is a manual reset mechanical thermostat; after the circuit is disconnected, a manual reset button must be pressed to restore power, meeting national safety regulations and improving product safety and compliance. Typically, the automatic reset mechanical thermostat model is KSD301, and the manual reset mechanical thermostat model is KSD303.

[0017] In the preferred embodiment, the first thermostat is set to an operating temperature of 40℃-60℃, and the second thermostat is set to an operating temperature of 70℃-80℃. The first thermostat provides low-temperature warnings and only issues warnings for slight overheating, without interrupting normal operation. The second thermostat is designed for high-temperature melting and immediate power-off in case of extreme dry burning or overheating. This gradient protection system avoids frequent false power outages while maintaining a safety baseline.

[0018] In the preferred embodiment, the depth of the upper flow channel cavity is 10mm-12mm, and the depth of the lower flow channel cavity is 7mm-10mm. This design ensures that the lower flow channel cavity is shallower than the upper flow channel cavity, resulting in a thinner liquid layer that allows for faster heat exchange with the partition plate and heating element, and more thorough preheating of the incoming water. The slightly deeper upper flow channel cavity ensures sufficient water flow capacity, balancing heating speed and water output.

[0019] In a preferred embodiment, the lower flow channel cavity is provided with a plurality of first water-blocking ribs arranged at intervals. One end of the first water-blocking rib is connected to one side wall of the lower flow channel cavity, and the other end of the first water-blocking rib forms a first flow-guiding gap between the other end of the first water-blocking rib and the other side wall of the lower flow channel cavity. Each pair of adjacent first flow-guiding gaps is arranged in an alternating manner. The side wall of the lower flow channel cavity, each of the first water-blocking ribs, each of the first flow-guiding gaps, the lower surface of the partition plate, and the lower cover plate together form the lower meandering flow channel. The upper flow channel cavity is provided with a plurality of second water-blocking ribs arranged at intervals. One end of the second water-blocking rib is connected to one side wall of the upper flow channel cavity, and the other end of the second water-blocking rib forms a second flow-guiding gap between the other end of the second water-blocking rib and the other side wall of the upper flow channel cavity. Each pair of adjacent second flow-guiding gaps is arranged in an alternating manner. The side wall of the upper flow channel cavity, each of the second water-blocking ribs, each of the second flow-guiding gaps, the upper surface of the partition plate, and the upper cover plate together form the upper meandering flow channel. The first water-blocking ribs are arranged in an alternating pattern to divide the lower flow channel cavity into a continuous S-shaped meandering lower meandering flow channel. The second water-blocking ribs are arranged in an alternating pattern to divide the upper flow channel cavity into a continuous S-shaped meandering upper meandering flow channel. This allows the lower meandering flow channel to form a continuous S-shaped meandering upper and lower double-layered return waterway with the upper meandering flow channel through the water passage.

[0020] In a further optimized embodiment, the upper sides of some of the second baffle plates located below the first thermostat are provided with first strip-shaped notches, and the lower end face of the first thermostat is located within each of these first strip-shaped notches without contacting the surface of the notches. Similarly, the upper sides of some of the second baffle plates located below the second thermostat are provided with second strip-shaped notches, and the lower end face of the second thermostat is located within each of these second strip-shaped notches without contacting the surface of the notches. Furthermore, the upper sides of some of the second baffle plates located below the temperature sensor are provided with third strip-shaped notches, and the lower end face of the temperature sensor is located within each of these third strip-shaped notches without contacting the surface of the notches. These strip-shaped notches provide clearance for the thermostat and temperature sensor, preventing direct contact between them and the baffle plates. This prevents the thermal conductivity of the baffle plates from interfering with the temperature measurement of the thermostat and temperature sensor, ensuring that the thermostat and temperature sensor only detect the true temperature of the water, resulting in more accurate temperature control.

[0021] In a further optimized design, each of the first and second water-retaining ribs is integrally formed with the heating box. This integral die-casting process eliminates gaps and leakage risks between the water-retaining ribs and the heating box, resulting in higher structural strength and enhanced pressure and explosion resistance. Furthermore, the water-retaining ribs and the heating box exhibit consistent thermal conductivity, leading to more uniform heat transfer.

[0022] In another preferred embodiment, the lower flow channel cavity is provided with a plurality of first water-blocking ribs arranged at intervals. One end of the first water-blocking rib is connected to one side wall of the lower flow channel cavity, and the other end of the first water-blocking rib forms a first flow-guiding notch between it and the other side wall of the lower flow channel cavity. Each pair of adjacent first flow-guiding notches is arranged in an alternating pattern. The side wall of the lower flow channel cavity, each first water-blocking rib, each first flow-guiding notch, the lower surface of the partition plate, and the lower cover plate together form the lower meandering flow channel; the upper The laminar flow channel cavity is equipped with multiple second baffle plates, multiple third baffle plates, and a fourth baffle plate arranged at intervals. Each second baffle plate is located in the front half of the upper laminar flow channel cavity, and the fourth baffle plate and each third baffle plate are located in the rear half of the upper laminar flow channel cavity. One end of each second baffle plate is connected to one side wall of the upper laminar flow channel cavity, and the other end of each second baffle plate forms a second flow guiding notch with the other side wall of the upper laminar flow channel cavity. Each pair of adjacent second flow guiding notches are staggered. The upper flow channel is arranged in a staggered manner; one end of the fourth baffle plate is connected to and perpendicular to the last second baffle plate, and the other end of the fourth baffle plate forms a third flow guide gap between itself and the side wall of the upper flow channel cavity; one end of a portion of the third baffle plate is connected to one side wall of the upper flow channel cavity, and the other end of this portion of the third baffle plate forms a fourth flow guide gap between itself and the fourth baffle plate; one end of another portion of the third baffle plate is connected to the fourth baffle plate, and the other end of this portion of the third baffle plate forms a fifth flow guide gap between itself and the side wall of the upper flow channel cavity; the last second flow guide gap and the adjacent fourth flow guide gap are staggered; the side wall of the upper flow channel cavity, each second baffle plate, each third baffle plate, each fourth baffle plate, each second flow guide gap, each fourth flow guide gap, each fifth flow guide gap, each third flow guide gap, the upper surface of the partition plate, and the upper cover plate together form the upper meandering flow channel.

[0023] In a further optimized embodiment, the upper sides of some of the second baffle plates located below the first thermostat are provided with first strip-shaped notches, and the lower end face of the first thermostat is located within each of these first strip-shaped notches without contacting the surface of the notches. Similarly, the upper sides of some of the third baffle plates located below the second thermostat are provided with second strip-shaped notches, and the lower end face of the second thermostat is located within each of these second strip-shaped notches without contacting the surface of the notches. Furthermore, the upper sides of some of the second and third baffle plates located below the temperature sensor are provided with third strip-shaped notches, and the lower end face of the temperature sensor is located within each of these third strip-shaped notches without contacting the surface of the notches. These strip-shaped notches provide clearance for the thermostat and temperature sensor, preventing direct contact between them and the baffle plates. This prevents the metal thermal conductivity of the baffle plates from interfering with the temperature measurement of the thermostat and temperature sensor, ensuring that the thermostat and temperature sensor only detect the true temperature of the water, resulting in more accurate temperature control.

[0024] In a further preferred embodiment, the fourth water-blocking rib is composed of a first short plate, a second short plate, and a third short plate that are sequentially connected and perpendicular to each other. One end of the first short plate is connected to and perpendicular to the last second water-blocking rib. One end of the third short plate forms the third flow-guiding notch between itself and the side wall of the upper flow channel cavity. The last second water-blocking rib, the first short plate, and the second short plate form a U-shaped water outlet area. The opening of the U-shaped water outlet area corresponds to the water outlet of the heating box. The temperature sensor's sensing probe is located in the U-shaped water outlet area. The U-shaped structure forms a closed, stable flow U-shaped water outlet area, which can eliminate water flow turbulence and fluctuations, making the water temperature collected by the temperature sensor more stable and without deviation, and improving temperature control accuracy.

[0025] In a further preferred embodiment, the second water-blocking rib, the first short plate, and the second short plate located below the temperature sensor are all provided with the third strip-shaped notch, and the lower end face of the temperature sensor is located in each of the third strip-shaped notches and does not contact the surface of each of the third strip-shaped notches.

[0026] In a further optimized design, each of the first, second, third, and fourth water-retaining ribs is integrally formed with the heating chamber. This integral die-casting process eliminates gaps and leakage risks between the water-retaining ribs and the heating chamber, resulting in higher structural strength and enhanced pressure and explosion resistance. Furthermore, the water-retaining ribs and the heating chamber exhibit consistent thermal conductivity, leading to more uniform heat transfer.

[0027] In a preferred embodiment, the upper cover plate is provided with a first mounting hole, a second mounting hole, and a third mounting hole. The first mounting hole corresponds to the upper water inlet section, and the first thermostat is installed in the first mounting hole via a first sealing ring. The second mounting hole corresponds to the upper water outlet section, and the second thermostat is installed in the second mounting hole via a second sealing ring. The third mounting hole is located near the water outlet of the heating chamber, and the temperature sensor is installed in the third mounting hole via a third sealing ring. The first thermostat, the second thermostat, and the temperature sensor are all installed in their corresponding mounting holes, and each temperature probe extends into the upper flow channel cavity to directly contact the water. Waterproof sealing is achieved through the corresponding sealing rings, ensuring no leakage and no gaps. In a more preferred embodiment, the first sealing ring, the second sealing ring, and the third sealing ring are all made of high-temperature silicone.

[0028] In a preferred embodiment, the edge of the upper cover plate is welded to the opening edge of the upper flow channel cavity, and the edge of the lower cover plate is welded to the opening edge of the lower flow channel cavity. The resulting metal heating chamber has greater rigidity and eliminates the risk of aging and failure of plastic seals.

[0029] In a further preferred embodiment, the lower surface edge of the upper cover plate and the upper surface edge of the lower cover plate are both provided with annular protrusions, and the opening edges of the upper and lower flow channel cavities are both provided with annular grooves that match the corresponding annular protrusions. When the upper cover plate is fitted onto the opening of the upper flow channel cavity and the lower cover plate is fitted onto the opening of the lower flow channel cavity, each annular protrusion is positioned in its corresponding annular groove. This design enables rapid and precise positioning of the cover plate and the heating chamber, avoiding misalignment during welding and improving assembly accuracy.

[0030] In a further preferred embodiment, the edges of both the upper and lower cover plates are provided with multiple limiting through holes, and the opening edges of both the upper and lower flow channel cavities are provided with multiple limiting posts corresponding to the respective limiting through holes. When the upper cover plate is closed over the opening of the upper flow channel cavity and the lower cover plate is closed over the opening of the lower flow channel cavity, each limiting post is positioned within its corresponding limiting through hole. Through the cooperation of each limiting post with its corresponding limiting through hole, pre-positioning can be quickly achieved before welding, preventing cover plate slippage and reducing the difficulty of welding operations.

[0031] In a preferred embodiment, the partition plate has a heating channel inside that can accommodate the heating element. The heating channel has two ports, and the heating element is located within the heating channel, with both ends of the heating element extending out from their respective ports to the outside of the heating chamber. During the die-casting process, the partition plate forms a heating channel capable of accommodating the heating element. This heating channel precisely positions the heating element, ensuring it does not shift or become exposed, resulting in more thorough separation of water and electricity.

[0032] In a preferred embodiment, an inlet pipe is provided at the inlet, and an outlet pipe is provided at the outlet. Both the inlet and outlet are equipped with filter screens. The presence of filter screens at both the inlet and outlet prevents impurities from entering the lower and upper meandering flow channels. Typically, the filter screens are made of stainless steel, and the pore size is 0.5-0.9 mm.

[0033] In a preferred embodiment, the heating chamber has at least one pair of hooks on its two opposite outer side walls for mounting on the toilet, and each hook has a mounting through hole for engaging with a locking bolt. This hook design facilitates quick and easy locking of the heating chamber to the smart toilet shell using the locking bolt, resulting in simple assembly and convenient disassembly.

[0034] In the preferred embodiment, the heating element is cylindrical, U-shaped, N-shaped, or M-shaped. Of course, the heating element embedded in the heating chamber can also be other common shapes.

[0035] In a preferred embodiment, the thermally conductive metal is an aluminum alloy, a zinc alloy, or a copper alloy.

[0036] In a preferred embodiment, the heating element is made of stainless steel, nickel-chromium alloy, titanium alloy, or iron-chromium-aluminum alloy.

[0037] The present invention also provides a heating method for the above-mentioned die-cast water-electricity separation smart toilet instant heating cleaning component, characterized by comprising the following steps: (1) Install the die-cast water-electricity separation smart toilet instant hot cleaning component in the corresponding position of the toilet; and set the operating temperature for the first thermostat and the second thermostat respectively, and set the target water outlet temperature for the temperature sensor; the die-cast water-electricity separation smart toilet instant hot cleaning component is equipped with a steam sterilization button and a steam bypass relay, the steam bypass relay is connected in parallel at both ends of the series branch of the first thermostat and the second thermostat, the signal output terminal of the steam sterilization button is electrically connected to the corresponding signal input terminal of the controller, and the coil of the steam bypass relay and the water valve of the toilet are electrically connected to the corresponding signal output terminal of the controller respectively; (2) Normal heating mode: Connect the power and open the toilet water valve to make the heating element heat up and conduct heat to the entire heating box. After the cold water enters from the water inlet at the bottom of the heating box, it flows from bottom to top and back and forth along the lower meandering channel, water hole, upper meandering channel and water outlet, so that the cold water can fully exchange heat with the entire heating box. At the same time, the temperature sensor of the first thermostat is inserted into the water in the upper water inlet section to monitor the water temperature of the water entering the upper water inlet section in real time: when the actual water temperature of the upper water inlet section reaches the operating temperature of the first thermostat, the contacts of the first thermostat are triggered to open, so that the circuit is disconnected; when the actual water temperature of the upper water inlet section is less than the operating temperature of the first thermostat, the contacts of the first thermostat are triggered to close, so that the circuit is connected. The temperature sensor of the second thermostat is located in the water of the upper outlet section, and further monitors the water temperature of the already heated upper outlet section in real time. When the actual water temperature of the upper outlet section reaches the operating temperature of the second thermostat, the contacts of the second thermostat are permanently disconnected, forcibly cutting off the power supply circuit and cannot be automatically reset. It can only be powered on again after manual reset. The temperature sensor collects the actual water temperature at the outlet of the heating chamber in real time and transmits the actual water temperature signal to the controller. The controller compares the actual water temperature with the target water temperature: if the actual water temperature is higher than the target water temperature, the controller controls the heating switch to turn off, so that the heating element stops heating; if the actual water temperature is lower than the target water temperature, the controller controls the heating switch to close, so that the heating element resumes heating and the water temperature is stably adjusted to the target water temperature, so that hot water flows out from the outlet of the heating chamber. (3) Steam sterilization mode: After pressing the steam sterilization button, the controller receives the steam sterilization signal and simultaneously performs the following actions: (3-1) The controller outputs a control signal to the steam bypass relay. The coil of the steam bypass relay is energized and the contacts are closed, bypassing the first temperature controller and the second temperature controller, so that the first temperature controller and the second temperature controller are out of the protection circuit. (3-2) The controller stops receiving and ignoring the temperature signal from the temperature sensor through the built-in program, stops performing temperature comparison, and controls the heating switch to remain closed so that the heating tube continues to heat. (3-3) The controller controls the toilet's water valve to continuously replenish water at a micro flow rate of 5mL / min-15mL / min, so that the water level entering the upper flow channel is 1 / 12-1 / 8 of the height of the upper flow channel; after the water in the upper meandering flow channel exchanges heat fully with the heating box, it vaporizes into water vapor, and the water vapor is discharged from the outlet of the heating box into the toilet, so that the water vapor sterilizes the toilet; (4) After steam sterilization is completed, release the steam sterilization button, the controller disconnects the power supply to the steam bypass relay, releases the bypass to the first thermostat and the second thermostat, and at the same time restores the temperature control signal reception and processing of the temperature sensor, controls the toilet water valve to restore normal water flow, and switches back to the normal heating mode in step (2).

[0038] In step (3-2) above, the controller compares the actual outlet water temperature with the target outlet water temperature using the built-in PID closed-loop control algorithm.

[0039] In step (4) above, steam sterilization is achieved by reducing the water flow rate in the upper flow channel cavity. When the water flow rate in the upper flow channel cavity decreases, the water flow in the upper flow channel cavity exchanges heat with the entire heating chamber and becomes water vapor. The water vapor is then sprayed out from the outlet of the heating chamber to sterilize the inside of the toilet with high temperature steam. During the sterilization process, a small amount of water is continuously added to ensure that steam is continuously generated and to prevent the heating chamber from burning dry.

[0040] In step (4) above, cutting off the power supply circuit of the first thermostat, the second thermostat, and the temperature sensor is to prevent the 100°C high temperature of the steam from directly damaging the first thermostat, the second thermostat, and the temperature sensor.

[0041] Compared with the prior art, the present invention has the following advantages: (1) Excellent heating uniformity and minimal temperature drift: This invention adopts a double-layered meandering flow channel design, which can significantly extend the total length of the flow channel, increase the heat exchange area, and allow the water flow to fully absorb heat to meet the heating requirements. On this basis, this invention adopts a die-cast structure in which the heating tube is embedded in the metal partition plate. The heat generated by the heating tube is not only conducted to the upper and lower surfaces of the partition plate, but also conducted to all the side walls, bottom and baffle plates of the flow channel through the integrally formed metal heating box, so that every inner surface of the entire lower meandering flow channel and the upper meandering flow channel becomes a uniform heating surface. When the water flows in the S-shaped meandering channel, it is surrounded by the three-dimensional heating surface throughout the entire process. The heat is evenly transferred into the water from all directions, avoiding the local overheating and temperature change caused by the "explosive" heat transfer of a single heating surface in traditional heaters.

[0042] (2) The present invention adopts complete water and electricity isolation, the heating tube does not come into direct contact with the water body, and the scale only adheres to the inner wall of the water channel, which can avoid the scale corrosion and encapsulation of the heating tube, greatly improving the heating efficiency; even if dry burning occurs, the heat can be quickly dispersed through the metal partition plate and heating box, avoiding local overheating of the heating tube and preventing the risk of the heating tube exploding or breaking during dry burning.

[0043] (3) This invention employs two independently operating, series-connected thermostats for dual temperature control, and simultaneously uses a temperature sensor to monitor the actual outlet water temperature in real time, forming a triple temperature control system. When dry burning occurs, the temperature in the upper flow channel cavity rises rapidly, triggering the two thermostats to operate sequentially and disconnect the power supply within 10 seconds. In addition, the heat-conducting die-cast structure of the heating chamber can withstand continuous dry burning for 30 seconds without damage, deformation, leakage, or combustion, completely covering the safety window before the temperature control power-off. Even if one thermostat fails, the other can still trigger protection. This double-insurance design can avoid the risks of heating tube bursting, leakage, and fire. When the water temperature rises abnormally (exceeding the safety threshold), the dual temperature control can also quickly disconnect the power to prevent scalding. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention; Figure 2 yes Figure 1 Schematic diagram of the internal structure of the heating chamber; Figure 3 This is a schematic diagram of the lower flow channel cavity in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the upper flow channel cavity in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the structure after the upper cover plate and the lower cover plate are closed in Embodiment 1 of the present invention; Figure 6 yes Figure 5 Cross-sectional view of AA in the middle; Figure 7 yes Figure 6 Cross-sectional view of BB in the middle; Figure 8 This is a schematic diagram of the software connection framework in Embodiment 1 of the present invention; Figure 9 This is a schematic diagram of the hardware connection in Embodiment 1 of the present invention; Figure 10 This is a schematic diagram of the upper flow channel cavity in Embodiment 2 of the present invention; Figure 11 This is a schematic diagram of the structure after the upper cover plate and the lower cover plate are closed in Embodiment 2 of the present invention; Figure 12 This is a schematic diagram of the structure of Embodiment 3 of the present invention. Detailed Implementation

[0045] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0046] Example 1, as Figure 1-9As shown, the die-cast water-electricity separation smart toilet instant hot water cleaning component in this embodiment includes a heating chamber 1, an upper cover plate 2 and a lower cover plate 3, a heating element 4, a heating switch 5, a first thermostat 6, a second thermostat 7, a temperature sensor 8, and a controller 9. The inner cavity of the heating chamber 1 is provided with an integrally connected partition plate 10, which divides the inner cavity of the heating chamber 1 into an upper flow channel cavity 11 and a lower flow channel cavity 12. The upper cover plate 2 covers the opening of the upper flow channel cavity 11, and the lower cover plate 3 covers the lower flow channel cavity 12. The opening of the cavity 12; the upper flow channel cavity 11 is provided with an upper meandering flow channel 111, and the lower flow channel cavity 12 is provided with a lower meandering flow channel 121; the partition plate 10 is provided with a water passage hole 101 that runs vertically through the cavity; the side wall of the heating box 1 is provided with a water inlet 13 and a water outlet 14; the water inlet 13 is connected to the water inlet end of the lower meandering flow channel 121; the water outlet end of the lower meandering flow channel 121 is connected to the water inlet end of the upper meandering flow channel 111 through the water passage hole 101; the water outlet end of the upper meandering flow channel 111 is connected to the water outlet 14; heating tube 4 is embedded in the partition plate 10, and both ends of the heating tube 4 are exposed on the outside of the heating box 1; the upper meandering flow channel 111 is provided with an upper water inlet section 112 and an upper water outlet section 113 in sequence along the water flow direction. The first thermostat 6, the second thermostat 7, and the temperature sensor 8 are all installed on the upper cover plate 2. The temperature probe of the first thermostat 6 is located in the upper water inlet section 112, the temperature probe of the second thermostat 7 is located in the upper water outlet section 113, and the temperature probe of the temperature sensor 8 is located in the upper flow channel cavity 11 and close to the heating box. The water outlet 14 of body 1; the first thermostat 6, the second thermostat 7, the heating element 4, and the heating switch 5 are connected in series to form a power supply circuit. The signal output terminals of the first thermostat 6, the second thermostat 7, and the temperature sensor 8 are electrically connected to the corresponding signal input terminals of the controller 9, and the heating switch 5 is electrically connected to the corresponding signal output terminal of the controller 9. The operating temperature set by the first thermostat 6 is lower than the operating temperature set by the second thermostat 7. The heating box 1, the partition plate 10, the upper cover plate 2, and the lower cover plate 3 are all made of thermally conductive metal.

[0047] The first thermostat 6 and the second thermostat 7 are connected in series and then connected to the power supply circuit of the heating element 4 and the heating switch 5 to form a hardware-level forced power-off protection circuit independent of the controller 9; the temperature sensor 8 is electrically connected to the corresponding signal input terminal of the controller 9 to form a temperature signal detection circuit to realize software temperature control.

[0048] During manufacturing, the heating chamber 1 and partition plate 10, both made of thermally conductive metal, are formed through a die-casting process. Before die-casting, heating elements 4 are pre-embedded in the mold. Molten metal is then poured into the mold. After die-casting, the heating elements 4 and partition plate 10 are tightly bonded together without gaps or splices, resulting in excellent heat transfer efficiency, high structural strength, and no risk of leakage. This all-metal die-cast structure, without brittle plastic parts, will not crack due to freezing at -30℃, making it suitable for use in cold northern regions.

[0049] Since the lower surface of the partition plate 10 serves as the top surface of the lower flow channel cavity 12, and the upper surface of the partition plate 10 serves as the bottom surface of the upper flow channel cavity 11, and the heating tube 4 is completely embedded and tightly wrapped inside the partition plate 10, the heating tube 4 is completely isolated from the water in the lower meandering flow channel 121 and the upper meandering flow channel 111, achieving complete water-electricity separation. The partition plate 10 provides high-strength, high-thermal-conductivity protection for the heating tube 4, completely sealing it off. Even in the event of dry burning, the heat can be quickly dispersed through the metal partition plate 10 and the heating chamber 1, preventing local overheating of the heating tube 4 and avoiding the risk of explosion or breakage of the heating tube 4 during dry burning.

[0050] Before use, the operating temperature of the first thermostat 6 and the second thermostat 7 are preset, and the target outlet water temperature is preset for the temperature sensor 8.

[0051] In use, the power is turned on and the toilet water valve is opened, causing the heating element 4 to heat up and conduct heat to the entire heating chamber 1. Cold water enters from the inlet 13 at the bottom of the heating chamber 1 and flows from bottom to top and back and forth along the lower meandering channel 121, the water passage 101, the upper meandering channel 111, and the outlet 14, fully exchanging heat with the entire heating chamber 1 throughout the process. Finally, hot water flows out from the outlet 14 at the top of the heating chamber 1. During use, the temperature sensor of the first thermostat 6 is in the water of the upper water inlet section 112, and monitors the water temperature of the water entering the upper water inlet section 112 in real time: when the actual water temperature of the upper water inlet section 112 reaches the operating temperature of the first thermostat 6, the contacts of the first thermostat 6 are triggered to open, thus disconnecting the circuit; when the actual water temperature of the upper water inlet section 112 drops below the operating temperature of the first thermostat 6, the contacts of the first thermostat 6 are triggered to close, thus connecting the circuit. The temperature sensor of the second thermostat 7 is located in the water of the upper outlet section 113, and it monitors the water temperature of the heated upper outlet section 113 in real time. When the actual water temperature of the upper outlet section 113 reaches the operating temperature of the second thermostat 7, it triggers the contacts of the second thermostat 7 to permanently disconnect, forcibly cutting off the power supply circuit and preventing automatic reset, thus preventing dry burning and overheating. Meanwhile, the temperature sensor 8 collects the actual water temperature of the outlet 14 of the heating chamber 1 in real time and transmits the actual water temperature signal to the controller 9 in real time. The controller 9 compares the actual water temperature with the target water temperature. If the actual water temperature is higher than the target water temperature, the controller 9 controls the heating switch 5 to open, so that the heating element 4 stops heating. If the actual water temperature is lower than the target water temperature, the controller 9 controls the heating switch 5 to close, so that the heating element 4 resumes heating, thereby controlling the on and off of the heating element 4 and realizing the precise adjustment of the water temperature of the outlet 14 of the heating chamber 1.

[0052] One end of the heating element 4 is used as the positive electrode and the other end as the negative electrode. The positive and negative electrodes are exposed on the outside of the heating box 1, which facilitates subsequent connection with the power supply circuit of the smart toilet.

[0053] Both the first temperature controller 6 and the second temperature controller 7 are mechanical temperature controllers, and the temperature sensor 8 is an NTC temperature sensor. The aforementioned mechanical temperature controller is a temperature control device that uses physical principles such as thermal expansion and contraction to sense temperature and controls the on / off state of the circuit through a mechanical structure. It is simple in structure, reliable and durable, and requires no electronic circuitry. The main types include bimetallic strip type and liquid expansion type temperature controllers. The aforementioned NTC temperature sensor is a thermistor probe, and its principle is that the resistance value decreases rapidly as the temperature rises.

[0054] The first thermostat 6 is an automatic reset type mechanical thermostat, and the second thermostat 7 is a manual reset type mechanical thermostat. When the actual water temperature in the upper inlet section 112 drops below the operating temperature of the first thermostat 6, the contacts of the first thermostat 6 automatically close, restoring power without manual intervention. This, combined with the NTC temperature sensor 8, achieves constant daily temperature, preventing excessively high water temperatures and ensuring uninterrupted cleaning flow. The second thermostat 7 is a manual reset type mechanical thermostat; after the circuit is disconnected, the reset button must be pressed manually to restore power, meeting national safety regulations and improving product safety and compliance. Typically, the automatic reset type mechanical thermostat model is KSD301; the manual reset type mechanical thermostat model is KSD303.

[0055] The first thermostat 6 is set to operate at 50±3℃, and the second thermostat 7 is set to operate at 70±3℃. The first thermostat 6 provides low-temperature warnings and only issues warnings for slight overheating, without interrupting normal operation. The second thermostat 7 is designed for high-temperature melting and immediate power-off in case of extreme dry burning or overheating. This gradient protection system avoids frequent false power outages while maintaining a safety baseline.

[0056] The upper flow channel cavity 11 has a depth of 10 mm, and the lower flow channel cavity 12 has a depth of 8 mm. This arrangement makes the lower flow channel cavity 12 shallower than the upper flow channel cavity 11. The shallower lower flow channel cavity 12 forms a thin liquid layer, which allows for faster heat exchange with the partition plate 10 and the heating tube 4, and more thorough preheating of the incoming water. The slightly deeper upper flow channel cavity 11 ensures the water flow capacity while balancing the heating rate and the water output.

[0057] The lower flow channel cavity 12 is provided with a plurality of first water-blocking ribs 122 arranged at intervals. One end of the first water-blocking rib 122 is connected to one side wall of the lower flow channel cavity 12, and the other end of the first water-blocking rib 122 forms a first flow guiding notch 123 between it and the other side wall of the lower flow channel cavity 12. Each pair of adjacent first flow guiding notches 123 are staggered. The side wall of the lower flow channel cavity 12, each first water-blocking rib 122, each first flow guiding notch 123, the lower surface of the partition plate 10, and the lower cover plate 3 together form the lower meandering flow channel 121; the upper flow channel cavity 11 is provided with a plurality of first water-blocking ribs 122 arranged at intervals. The upper flow channel cavity 111 consists of a second water-blocking rib 114, multiple third water-blocking ribs 115 and a fourth water-blocking rib 116 arranged at intervals. Each second water-blocking rib 114 is located in the front half of the upper flow channel cavity 11, and each fourth water-blocking rib 116 and each third water-blocking rib 115 is located in the rear half of the upper flow channel cavity 11. One end of each second water-blocking rib 114 is connected to one side wall of the upper flow channel cavity 11, and the other end of each second water-blocking rib 114 forms a second flow-guiding notch 117 with the other side wall of the upper flow channel cavity 11. Each pair of adjacent second flow-guiding notches 117 are arranged in a staggered pattern. The fourth water-blocking rib 114... One end of the fourth baffle plate 116 is connected to and perpendicular to the last second baffle plate 114. The other end of the fourth baffle plate 116 forms a third flow guide notch 118 between itself and the side wall of the upper flow channel cavity 11. One end of a portion of the third baffle plate 115 is connected to one side wall of the upper flow channel cavity 11, and the other end of this portion forms a fourth flow guide notch 119 between itself and the fourth baffle plate 116. Another portion of the third baffle plate 115 is connected to the fourth baffle plate 116 at one end, and the other end of this other portion is connected to the upper flow channel cavity 11. A fifth flow guide notch 110 is formed between the side walls of cavity 11. The last second flow guide notch 117 and the adjacent fourth flow guide notch 119 are arranged in an alternating position. The fifth flow guide notch 110 and the adjacent fourth flow guide notch 119 are also arranged in an alternating position. The side walls of the upper flow channel cavity 11, each second water-blocking rib 114, each third water-blocking rib 115, each fourth water-blocking rib 116, each second flow guide notch 117, each fourth flow guide notch 119, each fifth flow guide notch 110, each third flow guide notch 118, the upper surface of the partition plate 10, and the upper cover plate 2 together form the upper meandering flow channel 111.

[0058] The upper sides of the second water-blocking ribs 114 located below the first thermostat 6 are provided with first strip-shaped notches 1141, and the lower end face of the first thermostat 6 is located in each of the first strip-shaped notches 1141 and does not contact the surface of each of the first strip-shaped notches 1141; the upper sides of the third water-blocking ribs 115 located below the second thermostat 7 are provided with second strip-shaped notches 1151, and the lower end face of the second thermostat 7 is located in each of the second strip-shaped notches 1151 and does not contact the surface of each of the second strip-shaped notches 1151; the upper sides of the second water-blocking ribs 114 and the third water-blocking ribs 115 located below the temperature sensor 8 are provided with third strip-shaped notches 1142, and the lower end face of the temperature sensor 8 is located in each of the third strip-shaped notches 1142 and does not contact the surface of each of the third strip-shaped notches 1142. The aforementioned strip-shaped notches provide clearance for the thermostat and temperature sensor 8, preventing them from directly contacting the baffle plate and preventing the metal thermal conductivity of the baffle plate from interfering with the temperature measurement of the thermostat and temperature sensor 8. This ensures that the thermostat and temperature sensor 8 only detect the true temperature of the water, resulting in more accurate temperature control.

[0059] Each of the first water-retaining ribs 122, each of the second water-retaining ribs 114, each of the third water-retaining ribs 115, and each of the fourth water-retaining ribs 116 is integrally formed with the heating box body 1. This integral die-casting process eliminates gaps and leakage risks between the water-retaining ribs and the heating box body 1, resulting in higher structural strength and stronger pressure resistance and explosion resistance. Furthermore, the water-retaining ribs and the heating box body 1 have consistent thermal conductivity, leading to more uniform heat transfer.

[0060] The heat conduction and absorption mechanism during the heating process of this invention is as follows: The Joule heat generated by the heating tube 4 after it is energized is first rapidly transferred to the partition plate 10, which is tightly die-cast and integrally formed with it, via heat conduction. Since the partition plate 10, the heating chamber 1, each of the first water-blocking ribs 122, each of the second water-blocking ribs 114, each of the third water-blocking ribs 115, and the fourth water-blocking ribs 116 are all made of thermally conductive metal and are integrally die-cast, a three-dimensional heat-conducting network without interface thermal resistance is formed inside the entire heating chamber 1. The heat from the heating tube 4 not only rapidly spreads to the upper and lower surfaces of the partition plate 10, but also is evenly conducted along the side walls, bottom, and each water-blocking rib of the heating chamber 1. In other words, the top surface of the lower flow channel cavity 12 (the lower surface of the partition plate 10), the bottom surface of the upper flow channel cavity 11 (the upper surface of the partition plate 10), the side walls of the lower flow channel cavity 12, the side walls of the upper flow channel cavity 11, and the surfaces of all the first baffle plates 122 and the second baffle plates 114 all become heating surfaces participating in heat exchange. Every corner and every section of the wall of the entire meandering flow channel simultaneously transfers heat to the water flow, forming a true "full-channel three-dimensional heating". After entering through the inlet, the cold water first flows through the lower meandering channel in the lower flow channel cavity 12, where it undergoes forced convection heat exchange with the large-area, uniformly heated lower surface of the partition plate 10, as well as the side walls and baffles. The water flow continuously turns in the S-shaped meandering channel, and the boundary layer is repeatedly disrupted, resulting in a significant improvement in heat exchange efficiency. The preheated water then enters the upper flow channel cavity 11 through the water inlet, where it undergoes another thorough heat exchange with the upper surface of the partition plate 10, as well as all the side walls and baffles in the upper meandering channel, and finally outputs constant-temperature hot water from the outlet.

[0061] Unlike existing linear or simple flow channel heaters, this invention uses an all-metal die-cast body as the heating medium. The heat from the heating element 4 is first evenly distributed throughout the entire metal heating chamber 1, and then transferred to the water flow through the inner surfaces of all flow channels, fundamentally eliminating localized overheating. Traditional heaters often use exposed heating wires or ceramic heating elements that directly contact the water flow, and the heating surface is limited to a small area near the heating element. The temperature of the flow channel wall is much lower than that of the heating element, resulting in a "burst" instantaneous release of heat, uneven absorption by the water flow, and drastic fluctuations in the outlet water temperature (large temperature drift). This invention, through three-dimensional heating of the entire flow channel and the thermal inertia of the metal die-cast body, allows the water flow to steadily absorb heat at every wall surface it passes through, achieving truly constant temperature and comfortable cleaning.

[0062] The upper cover plate 2 is provided with a first mounting hole 21, a second mounting hole 22, and a third mounting hole 23. The first mounting hole 21 corresponds to the upper water inlet section 112, and the first thermostat 6 is installed in the first mounting hole 21 through a first sealing ring 24. The second mounting hole 22 corresponds to the upper water outlet section 113, and the second thermostat 7 is installed in the second mounting hole 22 through a second sealing ring 25. The third mounting hole 23 is close to the water outlet 14 of the heating chamber 1, and the temperature sensor 8 is installed in the third mounting hole 23 through a third sealing ring 26. The first thermostat 6, the second thermostat 7, and the temperature sensor 8 are all installed in their corresponding mounting holes, and each temperature probe extends into the upper flow channel cavity 11 to directly contact the water. Waterproof sealing is achieved through the corresponding sealing rings, ensuring no leakage and no gaps. In a more preferred embodiment, the first sealing ring 24, the second sealing ring 25, and the third sealing ring 26 are all made of high-temperature silicone.

[0063] The edge of the upper cover plate 2 is welded to the opening edge of the upper flow channel cavity 11, and the edge of the lower cover plate 3 is welded to the opening edge of the lower flow channel cavity 12. The metal heating box 1 formed by welding has stronger rigidity and eliminates the risk of aging and failure of plastic seals.

[0064] The lower surface edge of the upper cover plate 2 and the upper surface edge of the lower cover plate 3 are both provided with annular protrusions 27. The opening edges of the upper flow channel cavity 11 and the opening edges of the lower flow channel cavity 12 are both provided with annular grooves 28 that match the corresponding annular protrusions 27. When the upper cover plate 2 is closed on the opening of the upper flow channel cavity 11 and the lower cover plate 3 is closed on the opening of the lower flow channel cavity 12, each annular protrusion 27 is located in the corresponding annular groove 28. This arrangement enables rapid and accurate positioning of the cover plate and the heating box 1, avoids misalignment during welding, and improves assembly accuracy.

[0065] The upper cover plate 2 and the lower cover plate 3 each have multiple limiting through holes 29 along their edges. The opening edges of the upper flow channel cavity 11 and the lower flow channel cavity 12 each have multiple limiting posts 20 corresponding to the limiting through holes 29. When the upper cover plate 2 is closed over the opening of the upper flow channel cavity 11 and the lower cover plate 3 is closed over the opening of the lower flow channel cavity 12, each limiting post 20 is positioned within its corresponding limiting through hole 29. Through the cooperation of each limiting post 20 with its corresponding limiting through hole 29, pre-positioning can be quickly achieved before welding, preventing cover plate slippage and reducing the difficulty of welding operations.

[0066] The partition plate 10 has a heating channel 102 inside, which can accommodate the heating tube 4. The heating channel 102 has two ports 1021. The heating tube 4 is located in the heating channel 102, and its two ends extend from the corresponding ports 1021 to the outside of the heating box 1. During the die-casting process, the partition plate 10 forms a heating channel 102 that can accommodate the heating tube 4. The heating channel 102 precisely positions the heating tube 4, ensuring that the heating tube 4 does not shift or become exposed, and that the water and electricity separation is more thorough.

[0067] A water inlet pipe 15 is provided at the water inlet 13, and a water outlet pipe 16 is provided at the water outlet 14. Both the water inlet 13 and the water outlet 14 are equipped with filter screens. The presence of filter screens in both the water inlet 13 and the water outlet 14 prevents impurities from entering the lower bypass channel 121 and the upper bypass channel 111. Typically, the filter screens are made of stainless steel, and the pore size is 0.5-0.9 mm.

[0068] The heating chamber 1 has at least one pair of hanging ears 17 on its two opposite outer walls for mounting on the toilet. Each hanging ear 17 has a mounting through hole 171 for engaging with a locking bolt. The design of the hanging ears 17 makes it easy for the heating chamber 1 to be quickly locked to the smart toilet shell by the locking bolt, making assembly simple and disassembly convenient.

[0069] The heating element 4 is U-shaped. Of course, the heating element 4 embedded in the heating box 1 can also be other common shapes.

[0070] The heat-conducting metal is aluminum alloy. Heating element 4 is made of stainless steel.

[0071] The present invention also provides a heating method for the above-mentioned die-cast water-electricity separation smart toilet instant heating cleaning component, comprising the following steps: (1) Install the die-cast water-electricity separation smart toilet instant hot cleaning component in the corresponding position of the toilet; and set the operating temperature for the first thermostat 6 and the second thermostat 7 respectively, and set the target water outlet temperature for the temperature sensor 8; the die-cast water-electricity separation smart toilet instant hot cleaning component is equipped with a steam sterilization button 18 and a steam bypass relay 19. The steam bypass relay 19 is connected in parallel at both ends of the series branch of the first thermostat 6 and the second thermostat 7. The signal output terminal of the steam sterilization button 18 is electrically connected to the corresponding signal input terminal of the controller 9. The coil of the steam bypass relay 19 and the water valve of the toilet are electrically connected to the corresponding signal output terminal of the controller 9 respectively. (2) Normal heating mode: Connect the power supply and open the toilet water valve to make the heating element 4 heat up and conduct heat to the entire heating box 1. After the cold water enters from the water inlet 13 at the bottom of the heating box 1, it flows from bottom to top and back and forth along the lower meandering channel 121, water passage 101, upper meandering channel 111 and water outlet 14, so that the cold water can fully exchange heat with the entire heating box 1. At the same time, the temperature sensing probe of the first thermostat 6 is inserted into the water in the upper water inlet section 112 to monitor the water temperature of the water entering the upper water inlet section 112 in real time: when the actual water temperature of the upper water inlet section 112 reaches the operating temperature of the first thermostat 6, the contacts of the first thermostat 6 are triggered to open, so that the circuit is disconnected; when the actual water temperature of the upper water inlet section 112 is less than the operating temperature of the first thermostat 6, the contacts of the first thermostat 6 are triggered to close, so that the circuit is connected. The temperature sensor of the second thermostat 7 is located in the water of the upper water outlet section 113 and monitors the water temperature of the heated upper water outlet section 113 in real time. When the actual water temperature of the upper water outlet section 113 reaches the operating temperature of the second thermostat 7, the contacts of the second thermostat 7 are permanently disconnected, the power supply circuit is forcibly cut off and cannot be automatically reset. It can only be powered on again after manual reset. Temperature sensor 8 collects the actual water temperature at outlet 14 of heating chamber 1 in real time and transmits the actual water temperature signal to controller 9 in real time. Controller 9 compares the actual water temperature with the target water temperature: if the actual water temperature is greater than the target water temperature, controller 9 controls heating switch 5 to open, so that heating tube 4 stops heating; if the actual water temperature is less than the target water temperature, controller 9 controls heating switch 5 to close, so that heating tube 4 resumes heating and stabilizes the water temperature to the target water temperature, so that hot water flows out from outlet 14 of heating chamber 1. (3) Steam sterilization mode: After pressing the steam sterilization button 18, the controller 9 receives the steam sterilization signal and simultaneously performs the following actions: (3-1) The controller 9 outputs a control signal to the steam bypass relay. The coil of the steam bypass relay is energized and the contacts are closed, bypassing the first temperature controller 6 and the second temperature controller 7, so that the first temperature controller 6 and the second temperature controller 7 are out of the protection circuit. (3-2) The controller 9 stops receiving and ignoring the temperature signal from the temperature sensor 8 through its built-in program, stops performing temperature comparison, and controls the heating switch 5 to remain closed so that the heating tube 4 continues to heat. (3-3) The controller 9 controls the toilet's water valve to continuously replenish water at a micro flow rate of 5mL / min-15mL / min, so that the water level entering the upper flow channel 11 is 1 / 12-1 / 8 of the height of the upper flow channel 11; after the water in the upper meandering flow channel 111 undergoes sufficient heat exchange with the heating box 1, it vaporizes into water vapor, and the water vapor is discharged from the outlet 14 of the heating box 1 into the toilet, so that the water vapor sterilizes the toilet; (4) After steam sterilization is completed, release the steam sterilization button 18, the controller 9 disconnects the power supply to the steam bypass relay 19, releases the bypass to the first thermostat 6 and the second thermostat 7, and at the same time restores the temperature control signal reception and processing of the temperature sensor 8, controls the toilet water valve to restore normal water flow, and switches back to the normal heating mode in step (2).

[0072] The following is a comparative test of the constant temperature performance of the die-cast water-electricity separation intelligent toilet instant heating and washing component of the present invention with existing conventional ceramic tube instant heaters and storage water heaters on the market: ① The inlet cold water temperature is kept constant at 10℃ (in harsh winter conditions with low-temperature inlet water). ② The ambient temperature is kept constant at 23℃; ③ Water flow rate covers all commonly used settings of smart toilets: 500mL / min~1000mL / min; ④ Select the three commonly used water temperature settings for comfortable human washing: 37℃, 40℃, and 42℃.

[0073] By adjusting the outlet water flow rate step by step under the same environmental and inlet water conditions, and setting target water temperatures of 37℃, 40℃, and 42℃ for each flow rate, the deviation between the set outlet water temperature and the actual outlet water temperature was measured after the device stabilized, thus verifying the constant temperature control capability. The measured data are shown in Table 1 below:

[0074] As shown in Table 1 above, the water temperature deviation of this invention is stably controlled within ±0.3~±0.8℃ under full flow and full temperature settings. Even under extreme conditions of 10℃ low-temperature inlet water and 1000mL / min maximum outlet water flow, the maximum temperature drift is only ±0.8℃, and the outlet water is not suddenly hot or cold throughout the process, thus improving the comfort of the user.

[0075] Conventional ceramic tube instant heaters have a basic temperature drift of over ±0.8℃. The higher the flow rate and the higher the set temperature, the greater the temperature deviation becomes, with a maximum deviation of ±1.6℃. They also suffer from lag in temperature control and insufficient constant temperature capability. Conventional storage water heaters have the largest overall temperature deviation, with a basic error exceeding ±1.5℃. Under extreme conditions, the temperature drift can reach as high as ±2.3℃. In low-temperature and high-flow scenarios, the temperature becomes severely out of control, resulting in extremely poor consistency of the output water.

[0076] Example 2, as Figure 10-11 As shown, the difference between this embodiment and Embodiment 1 is that: The fourth baffle plate 116 is composed of a first short plate 1161, a second short plate 1162, and a third short plate 1163 that are connected and perpendicular to each other in sequence. One end of the first short plate 1161 is connected to and perpendicular to the last second baffle plate 114. One end of the third short plate 1163 forms the third flow guide notch 118 between itself and the side wall of the upper flow channel cavity 11. The last second baffle plate 114, the first short plate 1161, and the second short plate 1162 form a U-shaped water outlet area 1164. The opening of the U-shaped water outlet area 1164 corresponds to the water outlet 14 of the heating box 1. The temperature sensor 8's temperature probe is located in the U-shaped water outlet area 1164. The U-shaped structure forms a closed, stable flow U-shaped water outlet area 1164, which can eliminate water turbulence and fluctuations, making the water temperature collected by the temperature sensor 8 more stable and without deviation, and improving temperature control accuracy.

[0077] The second water-blocking rib plate 114, the first short plate 1161, and the second short plate 1162 located below the temperature sensor 8 are all provided with the third strip-shaped notch 1142. The lower end face of the temperature sensor 8 is located in each of the third strip-shaped notches 1142 and does not contact the surface of each of the third strip-shaped notches 1142.

[0078] Example 3, as Figure 12 As shown, the difference between this embodiment and Embodiment 1 is that: The lower flow channel cavity 12 is provided with a plurality of first water-blocking ribs 122 arranged at intervals. One end of the first water-blocking rib 122 is connected to one side wall of the lower flow channel cavity 12, and the other end of the first water-blocking rib 122 forms a first flow guiding notch 123 between it and the other side wall of the lower flow channel cavity 12. Each pair of adjacent first flow guiding notches 123 are arranged in an alternating manner. The side wall of the lower flow channel cavity 12, each first water-blocking rib 122, each first flow guiding notch 123, the lower surface of the partition plate 10, and the lower cover plate 3 together form the lower meandering flow channel 121. The upper flow channel cavity 11 is provided with a plurality of second water-blocking ribs 114 arranged at intervals. One end of the second water-blocking rib 114 is connected to one side wall of the upper flow channel cavity 11, and the other end of the second water-blocking rib 114 forms a second flow guiding notch 117 between the other end of the second water-blocking rib 114 and the other side wall of the upper flow channel cavity 11. Each pair of adjacent second flow guiding notches 117 are arranged in an alternating manner. The side wall of the upper flow channel cavity 11, each second water-blocking rib 114, each second flow guiding notch 117, the upper surface of the partition plate 10, and the upper cover plate 2 together form the upper meandering flow channel 111. The first baffle plates 122 are arranged in an alternating pattern to divide the lower flow channel cavity 12 into a continuous S-shaped meandering lower meandering flow channel 121. The second baffle plates 114 are arranged in an alternating pattern to divide the upper flow channel cavity 11 into a continuous S-shaped meandering upper meandering flow channel 111. This allows the lower meandering flow channel 121 to form a continuous S-shaped meandering upper and lower double-layered return waterway with the upper meandering flow channel 111 through the water passage hole 101.

[0079] The upper sides of the second water-blocking ribs 114 located below the first thermostat 6 are provided with first strip-shaped notches 1141, and the lower end face of the first thermostat 6 is located in each of the first strip-shaped notches 1141 and does not contact the surface of each of the first strip-shaped notches 1141; the upper sides of the second water-blocking ribs 114 located below the second thermostat 7 are provided with second strip-shaped notches 1151, and the lower end face of the second thermostat 7 is located in each of the second strip-shaped notches 1151 and does not contact the surface of each of the second strip-shaped notches 1151; the upper sides of the second water-blocking ribs 114 located below the temperature sensor 8 are provided with third strip-shaped notches 1142, and the lower end face of the temperature sensor 8 is located in each of the third strip-shaped notches 1142 and does not contact the surface of each of the third strip-shaped notches 1142. The aforementioned strip-shaped notches provide clearance for the thermostat and temperature sensor 8, preventing them from directly contacting the baffle plate and preventing the metal thermal conductivity of the baffle plate from interfering with the temperature measurement of the thermostat and temperature sensor 8. This ensures that the thermostat and temperature sensor 8 only detect the true temperature of the water, resulting in more accurate temperature control.

[0080] Each of the first water-retaining ribs 122 and each of the second water-retaining ribs 114 are integrally formed with the heating box 1. Through this integral die-casting process, there are no splicing gaps between each water-retaining rib and the heating box 1, eliminating the risk of water leakage, resulting in higher structural strength and stronger pressure resistance and explosion resistance; moreover, each water-retaining rib and the heating box 1 have consistent thermal conductivity, resulting in more uniform heat transfer.

[0081] Furthermore, it should be noted that the names of the various parts of the specific embodiments described in this specification may differ. All equivalent or simple variations made to the structure, features, and principles described in this invention are included within the scope of protection of this invention. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this invention or exceed the scope defined in these claims, all of which should fall within the scope of protection of this invention.

Claims

1. A die-cast water-electricity separation intelligent toilet instant heating and washing component, comprising a heating chamber, an upper cover, and a lower cover; characterized in that: It also includes a heating element, a heating switch, a first temperature controller, a second temperature controller, a temperature sensor, and a controller; the inner cavity of the heating chamber is provided with an integrally connected partition plate, which divides the inner cavity of the heating chamber into an upper flow channel cavity and a lower flow channel cavity; the upper cover plate covers the opening of the upper flow channel cavity, and the lower cover plate covers the opening of the lower flow channel cavity; the upper flow channel cavity has an upper meandering flow channel, and the lower flow channel cavity has a lower meandering flow channel; the partition plate has a water passage hole that runs vertically through the upper and lower parts; the side wall of the heating chamber has a water inlet and a water outlet, the water inlet is connected to the water inlet end of the lower meandering flow channel, the water outlet end of the lower meandering flow channel is connected to the water inlet end of the upper meandering flow channel through the water passage hole, and the water outlet end of the upper meandering flow channel is connected to the water outlet; the heating element is embedded in the partition plate, and both ends of the heating element... All components are exposed on the outside of the heating chamber. The upper meandering flow channel is sequentially provided with an upper water inlet section and an upper water outlet section along the water flow direction. The first thermostat, the second thermostat, and the temperature sensor are all mounted on the upper cover plate. The temperature probe of the first thermostat is located in the upper water inlet section, the temperature probe of the second thermostat is located in the upper water outlet section, and the temperature probe of the temperature sensor is located in the upper flow channel cavity and close to the water outlet of the heating chamber. The first thermostat, the second thermostat, the heating element, and the heating switch are connected in series to form a power supply circuit. The signal output terminals of the first thermostat, the second thermostat, and the temperature sensor are electrically connected to the corresponding signal input terminals of the controller, and the heating switch is electrically connected to the corresponding signal output terminal of the controller. The operating temperature set by the first thermostat is lower than the operating temperature set by the second thermostat. The heating chamber, partitions, top cover, and bottom cover are all made of thermally conductive metal.

2. The die-cast water-electricity separation intelligent toilet instant heating cleaning component as described in claim 1, characterized in that: Both the first and second temperature controllers are mechanical temperature controllers, and the temperature sensor is an NTC temperature sensor. The first temperature controller is set to operate at a temperature of 40℃-60℃, and the second temperature controller is set to operate at a temperature of 70℃-80℃.

3. The die-cast water-electricity separation intelligent toilet instant heating cleaning component as described in claim 1, characterized in that: The depth of the upper flow channel cavity is 10mm-12mm, and the depth of the lower flow channel cavity is 7mm-10mm.

4. The die-cast water-electricity separation intelligent toilet instant heating cleaning component as described in claim 1, characterized in that: The lower flow channel cavity is provided with a plurality of first water-blocking ribs arranged at intervals. One end of the first water-blocking rib is connected to one side wall of the lower flow channel cavity, and the other end of the first water-blocking rib forms a first flow-guiding gap between the other end of the first water-blocking rib and the other side wall of the lower flow channel cavity. Each pair of adjacent first flow-guiding gaps is arranged in an alternating position. The side wall of the lower flow channel cavity, each first water-blocking rib, each first flow-guiding gap, the lower surface of the partition plate, and the lower cover plate together form the lower meandering flow channel. The upper flow channel cavity is provided with a plurality of second water-blocking ribs arranged at intervals. One end of the second water-blocking rib is connected to one side wall of the upper flow channel cavity, and the other end of the second water-blocking rib forms a second flow-guiding gap between the other end of the second water-blocking rib and the other side wall of the upper flow channel cavity. Each pair of adjacent second flow-guiding gaps is arranged in an alternating position. The side wall of the upper flow channel cavity, each second water-blocking rib, each second flow-guiding gap, the upper surface of the partition plate, and the upper cover plate together form the upper meandering flow channel.

5. The die-cast water-electricity separation intelligent toilet instant heating cleaning component as described in claim 4, characterized in that: The upper sides of the second baffle plates located below the first thermostat are provided with first strip-shaped notches, and the lower end face of the first thermostat is located within each of the first strip-shaped notches and does not contact the surface of each of the first strip-shaped notches; the upper sides of the second baffle plates located below the second thermostat are provided with second strip-shaped notches, and the lower end face of the second thermostat is located within each of the second strip-shaped notches and does not contact the surface of each of the second strip-shaped notches; the upper sides of the second baffle plates located below the temperature sensor are provided with third strip-shaped notches, and the lower end face of the temperature sensor is located within each of the third strip-shaped notches and does not contact the surface of each of the third strip-shaped notches. Each of the first and second water-blocking ribs is integrally formed with the heating box body.

6. The die-cast water-electricity separation intelligent toilet instant heating cleaning component as described in claim 1, characterized in that: The lower flow channel cavity is provided with a plurality of first water-blocking ribs arranged at intervals. One end of the first water-blocking rib is connected to one side wall of the lower flow channel cavity, and the other end of the first water-blocking rib forms a first flow guiding gap between it and the other side wall of the lower flow channel cavity. Each pair of adjacent first flow guiding gaps are arranged in an alternating manner. The side wall of the lower flow channel cavity, each first water-blocking rib, each first flow guiding gap, the lower surface of the partition plate, and the lower cover plate together form the lower meandering flow channel. The upper flow channel cavity is provided with a plurality of second water-blocking ribs, a plurality of third water-blocking ribs, and a fourth water-blocking rib arranged at intervals. Each second water-blocking rib is located in the front half of the upper flow channel cavity, and the fourth water-blocking rib and each third water-blocking rib are located in the rear half of the upper flow channel cavity. One end of the second baffle plate is connected to one side wall of the upper flow channel cavity, and the other end of the second baffle plate forms a second flow guide notch between it and the other side wall of the upper flow channel cavity. Each pair of adjacent second flow guide notches is arranged in a staggered pattern. One end of the fourth baffle plate is connected to and perpendicular to the last second baffle plate. The other end of the fourth baffle plate forms a third flow guide notch between it and the side wall of the upper flow channel cavity. A portion of the third baffle plate has one end connected to one side wall of the upper flow channel cavity, and the other end of this portion forms a fourth flow guide notch between it and the fourth baffle plate. Another part of the third water-blocking rib plate is connected at one end to the fourth water-blocking rib plate. The other end of the third water-blocking rib plate forms a fifth flow guide gap between itself and the side wall of the upper flow channel cavity. The last second flow guide gap is staggered with the adjacent fourth flow guide gap, and the fifth flow guide gap is staggered with the adjacent fourth flow guide gap. The side wall of the upper flow channel cavity, each second water-blocking rib plate, each third water-blocking rib plate, each fourth water-blocking rib plate, each second flow guide gap, each fourth flow guide gap, each fifth flow guide gap, each third flow guide gap, the upper surface of the partition plate, and the upper cover plate together form the upper meandering flow channel.

7. The die-cast water-electricity separation intelligent toilet instant heating cleaning component as described in claim 6, characterized in that: The upper sides of the second baffle plates partially located below the first thermostat are each provided with a first strip-shaped notch, and the lower end face of the first thermostat is located within each of the first strip-shaped notches and does not contact the surface of each of the first strip-shaped notches; the upper sides of the third baffle plates partially located below the second thermostat are each provided with a second strip-shaped notch, and the lower end face of the second thermostat is located within each of the second strip-shaped notches and does not contact the surface of each of the second strip-shaped notches; the upper sides of the second baffle plates and the third baffle plates partially located below the temperature sensor are each provided with a third strip-shaped notch, and the lower end face of the temperature sensor is located within each of the third strip-shaped notches and does not contact the surface of each of the third strip-shaped notches; The fourth water-blocking rib is composed of a first short plate, a second short plate, and a third short plate that are connected to each other and perpendicular to each other in sequence. One end of the first short plate is connected to the last second water-blocking rib and is perpendicular to the last second water-blocking rib. One end of the third short plate forms the third flow guide gap between itself and the side wall of the upper flow channel cavity. The last second water-blocking rib, the first short plate, and the second short plate form a U-shaped water outlet area. The opening of the U-shaped water outlet area corresponds to the water outlet of the heating box. The temperature sensor's temperature probe is located in the U-shaped water outlet area. The second baffle plate, the first short plate, and the second short plate located below the temperature sensor are all provided with the third strip-shaped notch, and the lower end face of the temperature sensor is located in each of the third strip-shaped notches and does not contact the surface of each of the third strip-shaped notches; Each of the first water-blocking ribs, each of the second water-blocking ribs, each of the third water-blocking ribs, and each of the fourth water-blocking ribs are integrally formed with the heating box body.

8. The die-cast water-electricity separation intelligent toilet instant heating cleaning component as described in claim 1, characterized in that: The upper cover plate is provided with a first mounting hole, a second mounting hole and a third mounting hole. The first mounting hole corresponds to the upper water inlet section, and the first thermostat is installed in the first mounting hole through a first sealing ring. The second mounting hole corresponds to the upper water outlet section, and the second thermostat is installed in the second mounting hole through a second sealing ring. The third mounting hole is close to the water outlet of the heating box, and the temperature sensor is installed in the third mounting hole through a third sealing ring. The edge of the upper cover plate is welded to the opening edge of the upper flow channel cavity, and the edge of the lower cover plate is welded to the opening edge of the lower flow channel cavity. The lower surface edge of the upper cover plate and the upper surface edge of the lower cover plate are both provided with annular protrusions, and the opening edge of the upper flow channel cavity and the opening edge of the lower flow channel cavity are both provided with annular grooves that match the corresponding annular protrusions. The upper cover plate and the lower cover plate are provided with multiple limiting through holes, and the opening edge of the upper flow channel cavity and the opening edge of the lower flow channel cavity are provided with multiple limiting posts corresponding to the corresponding limiting through holes.

9. The die-cast water-electricity separation intelligent toilet instant heating cleaning component as described in claim 1, characterized in that: The partition plate has a heating channel inside that can accommodate the heating tube. The heating channel has two ports, and the heating tube is located in the heating channel. The two ends of the heating tube extend from the corresponding ports to the outside of the heating box. The inlet is equipped with an inlet pipe, and the outlet is equipped with an outlet pipe. Both the inlet and outlet are equipped with filter screens. The heating box has at least one pair of hanging ears on its two opposite outer side walls for mounting on a toilet, and each hanging ear has a mounting through hole for engaging with a locking bolt. The heating element is cylindrical, U-shaped, N-shaped, or M-shaped. The thermally conductive metal is an aluminum alloy, zinc alloy, or copper alloy; The heating element is made of stainless steel, nickel-chromium alloy, titanium alloy, or iron-chromium-aluminum alloy.

10. The heating method of the instant hot cleaning component of the die-cast water-electricity separation smart toilet as described in any one of claims 1-9, characterized in that... Includes the following steps: (1) Install the die-cast water-electricity separation smart toilet instant hot cleaning component in the corresponding position of the toilet; and set the operating temperature for the first thermostat and the second thermostat respectively, and set the target water outlet temperature for the temperature sensor; the die-cast water-electricity separation smart toilet instant hot cleaning component is equipped with a steam sterilization button and a steam bypass relay, the steam bypass relay is connected in parallel at both ends of the series branch of the first thermostat and the second thermostat, the signal output terminal of the steam sterilization button is electrically connected to the corresponding signal input terminal of the controller, and the coil of the steam bypass relay and the water valve of the toilet are electrically connected to the corresponding signal output terminal of the controller respectively; (2) Normal heating mode: Connect the power and open the toilet water valve to make the heating element heat up and conduct heat to the entire heating box. After the cold water enters from the water inlet at the bottom of the heating box, it flows from bottom to top and back and forth along the lower meandering channel, water hole, upper meandering channel and water outlet, so that the cold water can fully exchange heat with the entire heating box. At the same time, the temperature sensor of the first thermostat is inserted into the water in the upper water inlet section to monitor the water temperature of the water entering the upper water inlet section in real time: when the actual water temperature of the upper water inlet section reaches the operating temperature of the first thermostat, the contacts of the first thermostat are triggered to open, so that the circuit is disconnected; when the actual water temperature of the upper water inlet section is less than the operating temperature of the first thermostat, the contacts of the first thermostat are triggered to close, so that the circuit is connected. The temperature sensor of the second thermostat is located in the water of the upper outlet section, and further monitors the water temperature of the already heated upper outlet section in real time. When the actual water temperature of the upper outlet section reaches the operating temperature of the second thermostat, the contacts of the second thermostat are permanently disconnected, forcibly cutting off the power supply circuit and cannot be automatically reset. It can only be powered on again after manual reset. The temperature sensor collects the actual water temperature at the outlet of the heating chamber in real time and transmits the actual water temperature signal to the controller in real time. The controller compares the actual water temperature with the target water temperature: if the actual water temperature is greater than the target water temperature, the controller controls the heating switch to turn off, so that the heating element stops heating. If the actual outlet water temperature is lower than the target outlet water temperature, the controller controls the heating switch to close, so that the heating element resumes heating and the outlet water temperature is stably adjusted to the target outlet water temperature, so that hot water flows out from the outlet of the heating box. (3) Steam sterilization mode: After pressing the steam sterilization button, the controller receives the steam sterilization signal and simultaneously performs the following actions: (3-1) The controller outputs a control signal to the steam bypass relay. The coil of the steam bypass relay is energized and the contacts are closed, bypassing the first temperature controller and the second temperature controller, so that the first temperature controller and the second temperature controller are out of the protection circuit. (3-2) The controller stops receiving and ignoring the temperature signal from the temperature sensor through the built-in program, stops performing temperature comparison, and controls the heating switch to remain closed so that the heating tube continues to heat. (3-3) The controller controls the toilet's water valve to continuously replenish water at a micro flow rate of 5mL / min-15mL / min, so that the water level entering the upper flow channel is 1 / 12-1 / 8 of the height of the upper flow channel; after the water in the upper meandering flow channel exchanges heat fully with the heating box, it vaporizes into water vapor, and the water vapor is discharged from the outlet of the heating box into the toilet, so that the water vapor sterilizes the toilet; (4) After steam sterilization is completed, release the steam sterilization button, the controller disconnects the power supply to the steam bypass relay, releases the bypass to the first thermostat and the second thermostat, and at the same time restores the temperature control signal reception and processing of the temperature sensor, controls the toilet water valve to restore normal water flow, and switches back to the normal heating mode in step (2).

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