A disposable clean drinking water system based on groove limiting and multi-modal recognition and a control method thereof

Abstract

The present application belongs to the technical field of liquid heating appliances, and discloses a disposable clean drinking water system based on groove limiting and multi-modal recognition and a control method thereof, which is composed of a matched electromagnetic heating device and a disposable degradable inner container. The inner container is integrally formed with a positioning groove at the bottom, and the spatial position of the solidified magnetically conductive heating sheet and the radar echo characteristic are fixed. The device is built-in with a closed embedded electromagnetic heating module to realize central area fixed-point magnetic gathering and heating, and the magnetic field coupling loss is less than or equal to 8%. The device is equipped with a 24G-FMCW radar component, combined with a double-feature echo database and an Euclidean distance matching algorithm, to synchronously complete the inner container identity verification, liquid type discrimination and water level detection, and form a triple verification interlock with contact detection and magnetic flux sampling. The present application realizes one customer one replacement without cross contamination, has high efficient heating and intrinsic safety, and is suitable for various commercial scenes.

Description

Technical Field

[0001] This invention relates to the field of liquid heating appliances technology, specifically to a disposable clean drinking water system and its control method based on settling tank limiting and multimodal recognition. Background Technology

[0002] Existing commercial drinking water equipment presents significant hygiene risks and maintenance burdens. Split-type electric kettles require room-by-room cleaning and descaling, which can easily lead to cross-contamination; fixed water storage boilers use metal inner tanks to store water for extended periods, which can easily breed pathogens such as Legionella, and scale can easily clog pipes. The high cost of manual maintenance makes it difficult to meet the high-cleanliness drinking water needs of hotels, offices, and other similar settings.

[0003] Existing electromagnetic heating solutions for disposable biodegradable inner pots have fundamental flaws. General-purpose induction cookers cannot recognize thin inner pots with only a micro magnetic sheet, and require the addition of a full-area foreign object protection structure according to induction cooker standards, resulting in a larger overall size. Existing electromagnetic heating circuits for biodegradable inner pots generally suffer from high magnetic field coupling losses, localized overheating and carbonization, easy detachment of hot melt adhesive patches, and the risk of metal leaching from the aluminum foil layer, leading to insufficient reliability for industrialization.

[0004] Currently, there is a lack of complete clean drinking water solutions that simultaneously meet the requirements of fixed-point low-loss heating, multi-dimensional safety verification, and fully biodegradable consumables. Furthermore, the application of 24G-FMCW radar to paper-based container detection faces recognized technical obstacles: uneven fiber distribution in the pulp liner leads to high echo noise, and random deviations in the installation position of the magnetic guide sheet cause feature drift. There is a general lack of technical motivation in this field to use radar for integrated precision detection of the liner's identity, medium, and water level. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a disposable clean drinking water system based on settling tank limiting and multimodal recognition, including a matching electromagnetic heating device and a disposable biodegradable inner tank;

[0006] The bottom of the disposable biodegradable inner liner is integrally formed with a positioning groove, and the magnetic heating element is fixed inside the positioning groove.

[0007] The supporting electromagnetic heating equipment includes a main unit shell, a touch operation panel, a detachable matching kettle, a closed embedded electromagnetic heating module, a temperature control protection component, an anti-dry burning fuse component, a control motherboard, a kettle contact detection component, a 24G-FMCW radar safety water level detection and inner liner identification component, and an inner liner elastic limit fixing structure.

[0008] The enclosed embedded electromagnetic heating module is sealed and encapsulated inside a sealed plastic cavity at the bottom of the host, including a digital IGBT inverter motherboard, a high-frequency resonant capacitor bank, a dual-circuit inner dense outer sparse magnetic coil disk, a central cylindrical manganese zinc ferrite magnetic column, and a central single-point magnetic flux sampling element.

[0009] The enclosed embedded electromagnetic heating module generates a heating magnetic field only for the magnetic conductor within a circular area of ​​38mm to 52mm in the center; the 24G-FMCW radar safety water level detection and inner liner identification component emits a frequency-modulated continuous wave toward the bottom of the disposable biodegradable inner liner and receives the reflected echo; the control motherboard has a built-in characteristic echo database of the combination structure of the positioning sink and the magnetic heating element; based on the echo signal collected by the 24G-FMCW radar safety water level detection and inner liner identification component, the control motherboard simultaneously completes the identity verification of the disposable biodegradable inner liner, the identification of the liquid type, and the water level detection; the enclosed embedded electromagnetic heating module can only start heating when all three verifications pass.

[0010] Preferably, the positioning groove is a sunken groove with a depth of 0.25mm to 0.35mm and a diameter that is 0.8mm to 1.2mm larger than the outer diameter of the magnetic heating element, and a flatness tolerance of ≤0.03mm. During the heating process, the positioning groove, together with the inner liner elastic limiting and fixing structure, ensures that the offset between the magnetic heating element and the heating center is ≤1mm and the magnetic field coupling loss is ≤8%.

[0011] Preferably, the kettle contact detection component, the 24G-FMCW radar safety water level detection and inner liner identification component, and the central single-point magnetic flux sampling element constitute a triple verification and interlocking mechanism of contact conduction, radar multi-modal identification, and central magnetic flux sampling.

[0012] Preferably, the magnetic heating element adopts any one of the following three schemes:

[0013] Option 1: Use annealed soft SUS441 ferritic stainless steel sheet with a thickness of 0.27mm to 0.28mm. The outer ring is set with a full radius of R1.2, and a 2.2mm wide non-perforated edge sealing area is reserved. The inner side of the edge sealing area adopts an equilateral triangle staggered arrangement of round holes with a hole diameter of 2mm, a horizontal center distance of 3mm, an oblique center distance of 2.6mm, and an opening rate of 34.5% to 35%. The sheet is passivated with nitric acid on one side, with a dyne value ≥42.

[0014] Option 2: Use soft 430 ferritic stainless steel sheet with a thickness of 0.25mm or 0.28mm. It is a solid, non-perforated sheet with a single sheet structure. The sheet is passivated by high temperature nitric acid and sealed with micropores.

[0015] Option 3: Iron-chromium-niobium alloy powder sheets are formed by pressing iron-chromium-niobium alloy powder. The composition ratio is 91.5% iron, 7.8% chromium, and 0.7% niobium. It does not contain nickel and has a dense and porous overall structure.

[0016] Preferably, the dual-loop inner dense outer sparse magnetic coil is divided into two independent electrical circuits: an inner ring resonant winding and an outer ring magnetic coil; a central cylindrical manganese-zinc ferrite magnetic column is vertically fixed at the center of the dual-loop inner dense outer sparse magnetic coil, which gathers and confines the magnetic lines of force within a circular area of ​​38mm to 52mm.

[0017] Preferably, the kettle contact detection component is symmetrically arranged on the left and right sides of the main unit heating chamber, and consists of a pair of elastic conductive contacts; the compression stroke of the contacts is linked to the depth of the limiting slot of the disposable biodegradable inner liner; the control motherboard only allows the 24G-FMCW radar safety water level detection and inner liner identification component to start the identification process when the disposable biodegradable inner liner is fully embedded in the slot, the matching kettle can be completely pushed into the main unit heating chamber, and the contacts on both sides are synchronously connected.

[0018] Preferably, the 24G-FMCW radar safety water level detection and inner tank identification component is vertically installed on the top of the main unit, directly above the center of the detachable matching kettle, and adopts a distance threshold type 24G-FMCW radar module; the bottom of the component is provided with a 2mm thick food-grade PTFE Teflon wave-transparent sealing window; the component realizes water level detection through preset high and low water level distance thresholds: when there is no water reflection signal at both high and low water level points, it is determined to be a dry burning and water shortage state; when water is detected at the low water level point and not detected at the high water level point, it is determined to be a safe water level; when water is detected at both high and low water level points, it is determined to be a risk of overflow.

[0019] Preferably, the control motherboard has a built-in database of dual-feature echoes from the positioning sink, magnetic heating element, and water reflection wave, storing characteristic parameters of the disposable biodegradable inner liner and dielectric response models of clear water at different temperatures. After the 24G-FMCW radar acquires the echo, the control motherboard performs a Fast Fourier Transform (FFT) on the echo signal to extract three types of features: time delay, intensity, and phase. The measured features are then matched with the database template using an Euclidean distance algorithm. The calculation formula is as follows:

[0020] ;

[0021] The characteristic Euclidean distance of the echo; These are the measured echo delay characteristic values; The latency characteristic value of the database standard template; These are the measured characteristic values ​​of the echo intensity; The strength characteristic value of the database standard template; These are the measured echo phase characteristic values; The phase eigenvalues ​​of the database standard template; when satisfying When the feature is matched successfully, it is determined that a single feature is matched successfully; when the overall feature matches the database template by ≥90%, it is determined that it is a suitable disposable biodegradable liner.

[0022] Preferably, the inner liner elastic limiting and fixing structure includes an annular elastic limiting groove that can be disassembled and integrally formed with the inner cavity of the matching kettle, while limiting the horizontal radial displacement and vertical floating of the disposable biodegradable inner liner; after the disposable biodegradable inner liner is placed, it is completely positioned by the groove, ensuring that the magnetic heating element at the bottom center is coaxial with the cylindrical manganese zinc ferrite magnet column at the bottom center.

[0023] Preferably, the disposable biodegradable inner liner is made of food-grade sugarcane bagasse fiber through high-pressure integral molding, with the bottom thickened to 1.5mm to 1.7mm, and the outer wall is composite with a PLA biodegradable coating layer; the magnetic heating element is fixed inside the positioning groove by a food-grade adhesive layer, and then covered with a PLA biodegradable coating layer of kraft paper. The magnetic heating element is only arranged in a circular area of ​​38mm to 52mm in the center of the bottom, and there is no magnetic metal in the rest of the disposable biodegradable inner liner.

[0024] This invention also provides a control method for a disposable clean drinking water system based on settling tank limiting and multimodal recognition, implemented through the aforementioned system, comprising the following steps:

[0025] Step S1: Container positioning verification. The kettle contact detection component checks whether the detachable matching kettle is in place. When both sides of the contact are simultaneously connected, it is determined that the disposable biodegradable inner liner and the detachable matching kettle are in place, and the 24G-FMCW radar safety water level detection and inner liner identification component is activated to enter the detection process; if the contact is disconnected, the heating circuit remains locked.

[0026] Step S2: Echo signal acquisition. The 24G-FMCW radar safety water level detection and inner tank identification component emits frequency-modulated continuous waves to acquire the reflected echo signals from the positioning sink, magnetic heating element, and liquid surface at the bottom of the disposable degradable inner tank.

[0027] Step S3: Echo feature analysis. Perform FFT (Fast Fourier Transform) on the echo signal to extract three types of feature parameters: time delay, intensity, and phase. Use the Euclidean distance algorithm for feature matching. When (D≤0.15), it is determined that a single feature match is successful.

[0028] Step S4: Compliance determination of the inner liner and contents. The extracted overall features are compared with the database template. If the matching degree is ≥90%, the identity of the disposable degradable inner liner, the contents, and the water level are determined to be compliant. If the matching degree is insufficient, the device will immediately lock and trigger an alarm.

[0029] Step S5: Secondary verification of the magnetic heating element. Read the signal of the central single-point magnetic flux sampling element to verify whether there is a compliant magnetic heating element in the circular area of ​​38mm to 52mm in the center, forming a triple verification interlock of kettle contact detection, radar identification, and electromagnetic coupling.

[0030] Step S6: Dynamic power adjustment heating, dynamically adjusting the output power of the enclosed embedded electromagnetic heating module based on real-time water temperature and water level: when the water temperature... At that time, it heats up rapidly at 100% rated power; when the water temperature... At the same time, the frequency of water surface fluctuations is monitored in real time using a 24G-FMCW radar safety water level detection and inner tank identification component. When the frequency of water surface fluctuations Greater than the preset threshold When the liquid level stabilizes, reduce the output power to 50%–80% and then restore full power heating.

[0031] Step S7: Full-process safety monitoring. Monitor the status of the temperature control protection component and the anti-dry burning fuse component in real time throughout the process. If abnormal temperature or dry burning occurs, immediately cut off the heating output of the enclosed embedded electromagnetic heating module.

[0032] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0033] Heating efficiency and structural reliability are significantly improved. The positioning groove enables automatic mechanical centering of the magnetic heating element, and the elastic limiting structure of the inner tank ensures that the offset during the heating process is ≤1mm, reducing magnetic field coupling loss to less than 8%. Compared with the traditional sandwich embedded element structure, the heating efficiency is improved by more than 80%. The groove limiting structure can work continuously in boiling water for more than 3 hours without the element detaching, eliminating the risk of carbonization at the bottom of the inner tank. The structural stability is significantly better than the hot melt adhesive patch solution.

[0034] The accuracy of identification and the level of safety protection have been comprehensively improved. The positioning and solidification of echo characteristics have narrowed the batch fluctuation of radar echo phase from ±15° to ±3°, reducing the misjudgment rate of inner tank identification to less than 1%. The 24G-FMCW radar simultaneously realizes multi-modal detection of identity, water level, and medium. Combined with contact conduction and central magnetic flux sampling, it forms a triple verification interlock, which can accurately identify various anomalies and handle them in a graded manner, ensuring the safe operation of equipment.

[0035] The system boasts significant advantages in clean operation and maintenance as well as environmental performance. The disposable biodegradable inner tank allows for one-time replacement for each guest, and the equipment itself does not come into contact with water, thus avoiding cross-contamination at the source. It also eliminates the need for cleaning and disinfection, reducing the overall operation and maintenance cost of guest room drinking water equipment by more than 95% compared to traditional water dispensers. The inner tank is made of food-grade biodegradable material, which can be completely composted and degraded in the industrial environment after disposal, thus balancing hygiene, convenience, and environmental protection. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the system of the present invention;

[0037] Figure 2 This is a schematic cross-sectional view of the internal assembly of the system of the present invention;

[0038] Figure 3 This is a schematic diagram of the dual-loop magnetic coil disk structure of the system of the present invention;

[0039] Figure 4 This is a schematic diagram of the separate assembly of the disposable inner liner and the magnetic heating element of the system of the present invention;

[0040] Figure 5 This is a schematic cross-sectional view of the bottom groove bonding structure of the inner liner of the system of the present invention.

[0041] Figure 6 This is a schematic cross-sectional view of the fixed-point magnetic heating coupling system of the present invention;

[0042] Figure 7 This is a comparative schematic diagram of three magnetic heating element structures in the system of the present invention.

[0043] In the attached diagram, the components represented by each number are as follows:

[0044] 1. Main unit casing; 2. Touch control panel; 3. Detachable matching kettle; 4. Enclosed embedded electromagnetic heating module; 5. Kettle contact detection component; 6. 24G-FMCW radar safety water level detection and inner liner identification component; 7. Inner liner elastic limit fixing structure; 9. High-frequency resonant capacitor bank; 10. Dual-loop inner dense outer sparse magnetic coil disk; 11. Central cylindrical manganese-zinc ferrite magnetic column; 12. Inner ring resonant winding; 13. Outer ring magnetic winding; 14. Main unit heating chamber; 15. Food-grade PTFE Teflon wave-transparent sealing window; 16. Disposable biodegradable inner liner; 17. Magnetic heating element; 18. Positioning groove; 19. Food-grade adhesive layer; 20. PLA biodegradable coated kraft paper; 21. Annealed soft SUS441 ferritic stainless steel sheet; 22. Soft 430 ferritic stainless steel sheet; 23. Iron-chromium-niobium alloy powder sheet. Detailed Implementation

[0045] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0046] This embodiment presents a control method for a disposable clean drinking water system based on a settling tank with limiting and multimodal recognition. The method utilizes a positioning settling tank 18 structure to achieve precise physical limiting and recognition feature fixation of the magnetic heating element 17. A 24G-FMCW radar safety water level detection and inner tank identification component 6 enables multimodal recognition of the identity, water level, and contained medium of the disposable degradable inner tank 16. Combined with fixed-point magnetic electromagnetic heating technology, this ultimately achieves sterile drinking water heating with one-time replacement and no cross-contamination. To achieve the above method, this embodiment uses a disposable clean drinking water system based on a settling tank with limiting and multimodal recognition. The electromagnetic heating equipment and the disposable degradable inner tank 16 form a double interlock through physical structure and control logic. The heating process can only be started when the disposable degradable inner tank 16 is in place and all multimodal recognition verifications pass.

[0047] refer to Figures 1-2 A disposable clean drinking water system based on settling tank limiting and multimodal recognition includes a matching electromagnetic heating device and a disposable biodegradable inner tank 16, which together constitute a complete aseptic drinking water heating system. The matching electromagnetic heating device mainly consists of a main unit shell 1, a touch control panel 2, a detachable matching kettle 3, a closed embedded electromagnetic heating module 4, a temperature control protection component, an anti-dry-burning fuse component, a control motherboard, a kettle contact detection component 5, a 24G-FMCW radar safety water level detection and inner tank recognition component 6, and an inner tank elastic limiting and fixing structure 7.

[0048] The enclosed, embedded electromagnetic heating module 4 is completely sealed inside a closed plastic cavity at the bottom of the main unit. It cannot be disassembled separately or powered independently of the main unit. It serves only as the built-in core component of the liquid heater, allowing the entire unit to be classified as a liquid heater according to GB4706.15 standard and complete 3C certification. The enclosed, embedded electromagnetic heating module 4 includes a digital IGBT inverter main board 8, a high-frequency resonant capacitor bank 9, a dual-loop inner dense and outer sparse magnetic coil disk 10, a central cylindrical manganese-zinc ferrite magnetic column 11, and a central single-point magnetic flux sampling element. The operating resonant frequency of the digital IGBT inverter main board is stable between 38kHz and 45kHz. The underlying program of the digital IGBT inverter main board eliminates the three types of limiting logic of civilian induction cookers: periodic full-area pot detection scanning, full-area small metal foreign object identification, and minimum load impedance threshold interception. The control motherboard only collects the magnetic flux sampling signal of the central single-point magnetic flux sampling element, shields the magnetic field feedback of the outer ring of the dual-loop inner dense outer sparse magnetic coil disk 10, and only identifies the magnetic flux change generated by the magnetic heating element 17 within the central 38mm to 52mm range, so as to achieve precise point-to-point driving.

[0049] refer to Figure 3The dual-loop inner-dense, outer-sparse magnetic coil 10 is divided into two independent electrical circuits: an inner ring resonant winding 12 and an outer ring magnetic coil 13. The inner ring resonant winding 12 has densely arranged copper wires and a large number of turns, responsible for generating the main magnetic field that produces eddy current heating; the outer ring magnetic coil 13 has sparsely arranged copper wires, used to confine the magnetic field outwards. A central cylindrical manganese-zinc ferrite magnetic column 11 is vertically fixed at the center of the dual-loop inner-dense, outer-sparse magnetic coil 10, which can gather and confine the magnetic lines of force within a circular area of ​​38mm to 52mm, improving the magnetic field coupling efficiency.

[0050] The machine is equipped with dual overheat protection mechanisms: electronic temperature control protection, which immediately cuts off the heating circuit when the cavity temperature is >125℃; and mechanical overheat fuse, which serves as the ultimate protection under extreme conditions.

[0051] The kettle contact detection component 5 is symmetrically arranged on the left and right sides of the main unit heating chamber 14, and consists of a pair of elastic conductive contacts. The compression stroke of the contacts is linked to the depth of the limiting slot of the disposable biodegradable inner liner 16. Only when the disposable biodegradable inner liner 16 is fully embedded in the slot, the detachable matching kettle 3 is fully pushed into the main unit heating chamber 14, and the contacts on both sides are synchronously connected, will the control motherboard allow the subsequent 24G-FMCW radar safety water level detection and inner liner identification component 6 identification process to be started. When the detachable matching kettle 3 is not placed or an incompatible container is used, the contacts are in the open state, the heating circuit remains locked, and heating cannot be started.

[0052] The 24G-FMCW radar safety water level detection and inner tank identification component 6 is vertically installed on the top of the main unit, directly above the detachable matching kettle 3, and adopts a distance threshold type 24G-FMCW radar module. The bottom of the 24G-FMCW radar safety water level detection and inner tank identification component 6 is equipped with a 2mm thick food-grade PTFE Teflon wave-transparent sealing window 15, which can isolate steam and water vapor, ensuring the stable operation of the distance threshold type 24G-FMCW radar module in a high-temperature and closed steam environment of 100 to 125℃.

[0053] The 24G-FMCW radar safety water level detection and inner tank identification component 6 achieves water level detection through preset high and low water level distance thresholds, and the judgment rules are as follows:

[0054] No water reflection signal at either the high or low water level: This indicates a dry-burning and water shortage state. The red water shortage light on the panel will remain on, the heating will be locked, and an intermittent alarm will sound.

[0055] Water body detected at low water level and no water body detected at high water level: determined to be a safe water level, green light stays on, allowing the enclosed embedded electromagnetic heating module 4 to start heating;

[0056] If water is detected simultaneously at both high and low water level points, indicating a risk of overflow, the heating output will be immediately cut off, the overflow red light will remain on, and heating will be locked.

[0057] The 24G-FMCW radar safety water level detection and inner tank identification component 6 uses a distance threshold pre-matched with the magnetic heating element 17 and the water's material reflection coefficient. The control motherboard has a built-in dual-feature echo database of "positioning trough 18 - magnetic heating element 17" and "water reflection wave," storing characteristic parameters of the disposable degradable inner tank 16, including the echo delay corresponding to the positioning trough 18, the attenuation coefficient of the magnetic heating element 17, the phase characteristics of the disposable degradable inner tank 16, and the dielectric response model of clean water at different temperatures. If the measured echo's phase, intensity, and distance characteristics deviate from the database template by more than ±10%, it is determined to be an incompatible disposable degradable inner tank 16 or an unsafe liquid, and the equipment locks and alarms.

[0058] The inner liner elastic limiting and fixing structure 7 includes an annular elastic limiting groove integrally formed within the inner cavity of the matching kettle 3, which can simultaneously limit the horizontal radial displacement and vertical floating of the disposable biodegradable inner liner 16; (Reference) Figure 6 After the disposable biodegradable inner liner 16 is placed, it is completely positioned by the slot, ensuring that the magnetic heating element 17 at the bottom center and the cylindrical manganese-zinc ferrite magnetic column 11 at the bottom center are precisely coaxial, and the offset between the two during the heating process is ≤1mm.

[0059] refer to Figures 4-5 The disposable biodegradable inner liner 16 used in this system is made of food-grade sugarcane bagasse fiber through high-pressure integrated molding. It features a flat bottom, uniform wall thickness, and no air bubbles, reducing radar wave penetration noise and improving liquid identification accuracy. The bottom of the disposable biodegradable inner liner 16 is thickened to 1.5mm to 1.7mm. The outer wall of the bottom of the disposable biodegradable inner liner 16 is integrally stamped with a positioning groove 18. The outer wall is not hot-pressed or calendered, preserving the original fiber capillary pores. The magnetic heating element 17 is fixed inside the positioning groove 18 by a food-grade adhesive layer 19, and then covered with a PLA biodegradable coating layer of kraft paper 20. The magnetic heating element 17 is only located in the central 38mm to 52mm area at the bottom; the rest of the disposable biodegradable inner liner 16 has no magnetic metal.

[0060] The positioning groove 18 is a recessed groove whose shape can be adjusted to match the overall shape of the container. Its dimensions are: depth 0.25mm to 0.35mm, diameter 0.8mm to 1.2mm larger than the outer diameter of the magnetic heating element 17, and flatness tolerance ≤0.03mm. The positioning groove 18 is the fundamental structure for achieving precise heating and stable identification, and it has three core functions:

[0061] Mechanical alignment and solidification of identification features: At the physical level, the rigid boundary of the tank wall forms a hard limit, and during the production process of the disposable biodegradable inner liner 16, the magnetic heating element 17 can be automatically centered when placed in the tank without secondary calibration; at the data level, the positioning sink 18 fixes the spatial position of the magnetic heating element 17, solidifies the difference in dielectric constant between the magnetic heating element 17 and the paper fiber, eliminates radar echo phase and amplitude drift, and ensures that the identification features of each disposable biodegradable inner liner 16 are unique and stable.

[0062] Eliminating air gaps and reducing losses: The depth of the positioning groove 18 is equal to or slightly less than the thickness of the magnetic heating element 17. After the magnetic heating element 17 is installed, its lower surface is flush with or slightly sunken to the end face of the positioning groove 18. This can control the magnetic field coupling loss to ≤8%, greatly improving heating efficiency while preventing one-time degradation and carbonization of the bottom of the inner liner 16.

[0063] Anti-deviation during heating: The side wall of the positioning sink 18 is combined with the elastic limiting and fixing structure 7 of the inner liner. During the heating process, the deviation between the magnetic heating element 17 and the heating center is ≤1mm, ensuring heating stability and safety.

[0064] refer to Figure 7 This system is equipped with three different positioning magnetic heating element 17 schemes, which can be interchanged according to application scenarios and cost requirements. All of them are compatible with the same positioning sink 18 structure and closed embedded electromagnetic heating module 4 driver program.

[0065] Option 1: For dual electromagnetic and microwave applications, use annealed soft SUS441 ferritic stainless steel sheet 21 with a thickness of 0.27mm to 0.28mm; the outer ring has a full radius of R1.2, with a 2.2mm wide non-perforated edge sealing area. The inner side of the edge sealing area uses equilateral triangle staggered circular holes; the hole diameter is 2mm, the horizontal center distance is 3mm, the diagonal center distance is 2.6mm, and the opening rate is 34.5% to 35%; the sheet is passivated with nitric acid on one side, with a dyne value ≥42, which can eliminate the risk of electric arc under microwave conditions.

[0066] Option 2: The pure electromagnetic mass production solution uses a soft 430 ferritic stainless steel sheet 22 with a thickness of 0.25mm or 0.28mm. It is a solid, non-perforated sheet structure. The sheet is passivated by high temperature nitric acid and sealed with micropores. It is suitable for pure electromagnetic heating scenarios and has high mass production capability and cost advantages.

[0067] Option 3: The compostable and degradable solution uses iron-chromium-niobium alloy powder sheet 23, which is pressed and formed from iron-chromium-niobium alloy powder. The composition ratio is: iron 91.5%, chromium 7.8%, niobium 0.7%, and nickel-free. The overall structure is dense and porous. Under standard industrial composting environment, the overall degradation rate of the material is ≥90% within 180 days, meeting the environmental protection requirements of full degradability.

[0068] The structure and deep collaboration between the positioning trench and radar algorithm:

[0069] The positioning groove 18 of this invention forms a deep synergistic relationship between the structure and algorithm and the 24G-FMCW radar identification algorithm: the positioning groove 18 is integrally stamped during the pulp molding process, controlling the positional deviation of the magnetic heating element 17 within ±0.15mm, solving the industry problem of poor positional consistency of the magnetic element during the hot pressing process of pulp substrate; this positional consistency directly ensures that the standard deviation of the radar echo delay parameter Δt is narrowed from ±0.3ms in the prior art to ±0.05ms, making the judgment threshold of D≤0.15 of the Euclidean distance matching algorithm statistically significant. The positioning groove 18 also solidifies the difference in dielectric constant between the magnetic heating element 17 and the pulp fiber, reducing the batch fluctuation of the radar echo phase characteristic φ from ±15° to ±3°, providing a repeatable feature benchmark for high-precision liquid type discrimination (deviation ±12% threshold). The synergistic effect of the aforementioned structure and algorithm enables the FMCW radar, which was originally only used for rough industrial liquid level measurement, to achieve precise triple identification of identity, water level, and medium in the scenario of disposable paper-based containers for the first time.

[0070] The chain-like collaborative logic between the positioning sink 18, the 24G-FMCW radar safety water level detection and inner liner identification component 6, and the enclosed embedded electromagnetic heating module 4 is as follows: the forming accuracy of the positioning sink 18 (depth 0.25 to 0.35 mm, flatness ≤ 0.03 mm) directly determines the consistency of the dielectric constant difference between the magnetic heating element 17 and the pulp substrate. This consistency is the physical basis for the repeatability of the radar echo phase characteristic φ. The repeatability of the phase characteristic is the statistical premise for the Euclidean distance algorithm D≤ 0.15 judgment threshold. And the accurate radar identification is a prerequisite for triggering the start of the enclosed embedded electromagnetic heating module 4.

[0071] Comparative experiments verified:

[0072] Thirty units each of the positioning inner liner of this invention and the control inner liner without a positioning structure were taken, and the radar echo phase consistency was tested on the same 24G-FMCW radar testing platform. The results showed that the standard deviation of the phase characteristic of the positioning inner liner of this invention was ±2.8° to ±3.2°, with a maximum batch-to-batch deviation ≤6°; the standard deviation of the phase characteristic of the control group was ±12.5° to ±15.8°, with a maximum batch-to-batch deviation ≥32°. This demonstrates that the positioning inner liner, by solidifying the spatial position of the magnetic heating element, significantly eliminates the echo phase drift caused by uneven fiber distribution in the pulp substrate.

[0073] A multimodal recognition method based on the features of the positioning sinkhole:

[0074] This method takes the 24G-FMCW radar safety water level detection and inner liner identification component 6 as the core, and combines the solidified structural features of the positioning sink 18 to simultaneously realize three functions: identification of the disposable degradable inner liner 16, water level detection, and identification of the contained medium. It constitutes a multimodal identification safety system and is the core safety verification link of the control method of this system.

[0075] The control motherboard has a built-in feature echo database of "positioning groove 18 - magnetic heating element 17" and "clear water feature template," storing feature parameters of the disposable biodegradable inner liner 16, including the echo delay corresponding to the positioning groove 18, the attenuation coefficient of the magnetic heating element 17, the phase characteristics of the disposable biodegradable inner liner 16, and the dielectric response model of clear water in the full temperature range of 0℃ to 100℃. The system can match the corresponding reference curve according to the real-time ambient temperature to improve the recognition accuracy.

[0076] The identification and judgment process is as follows:

[0077] The 24G-FMCW radar safety water level detection and inner tank identification component 6 transmits frequency-modulated continuous waves to collect the reflected echoes from the disposable degradable inner tank positioning sink 18, the magnetic heating element 17, and the liquid surface.

[0078] The control motherboard performs a Fast Fourier Transform (FFT) on the echo signal to extract three types of features: time delay, intensity, and phase.

[0079] The Euclidean distance algorithm is used to match the measured features with the database template. The calculation formula is as follows:

[0080] ;

[0081] The characteristic Euclidean distance of the echo; These are the measured echo delay characteristic values; The latency characteristic value of the database standard template; These are the measured characteristic values ​​of the echo intensity; The strength characteristic value of the database standard template; These are the measured echo phase characteristic values; These are the phase eigenvalues ​​of the database standard template. When they satisfy... If the feature is matched successfully, it is determined that a single feature is matched successfully; if the overall feature matches the database template by ≥90%, it is determined that it is a compatible disposable degradable inner liner 16; otherwise, it is determined that it is not compatible with disposable degradable inner liner 16 or a dangerous container, and the equipment is locked and an alarm is triggered.

[0082] Based on identification, the 24G-FMCW radar safety water level detection and inner tank identification component 6 can further identify the type of liquid contained: by distinguishing clean water from other media through the intensity, phase and dielectric properties of the liquid surface echo, when the characteristic deviation exceeds ±12%, it is determined to be an unsafe liquid and heating is prohibited.

[0083] The system employs a tiered handling strategy for different media:

[0084] Dry burning, metallic foreign objects, unsafe liquids (oil, alcohol, etc.): Lock the machine and continuously alarm;

[0085] Neutral liquids such as dairy products and tea: A pop-up prompts the user to manually confirm before heating is allowed;

[0086] Clean water, mineral water, and distilled water: Automatic full-power heating.

[0087] The present invention discloses a control method for a disposable clean drinking water system based on settling tank limiting and multimodal recognition. Relying on the structural foundation of the 18-position settling tank and the safety verification of multimodal recognition, the method executes a complete heating control process according to the following steps:

[0088] Step S1: Container positioning verification. The kettle contact detection component 5 checks whether the detachable matching kettle 3 is in place. When the contacts on both sides are simultaneously connected, it is determined that the disposable degradable inner liner 16 and the detachable matching kettle 3 are in place, and the 24G-FMCW radar safety water level detection and inner liner identification component 6 is activated to enter the detection process; if the contacts are disconnected, the heating circuit remains locked.

[0089] Step S2: Echo signal acquisition 24G-FMCW radar safety water level detection and inner tank identification component 6 transmits frequency-modulated continuous wave to acquire the reflected echo signals from the positioning sink 18, magnetic heating element 17 and liquid surface at the bottom of the disposable degradable inner tank.

[0090] Step S3: Echo Feature Analysis. Perform FFT (Fast Fourier Transform) on the echo signal to extract three types of feature parameters: time delay, intensity, and phase. Use the Euclidean distance algorithm described above for feature matching. The system is then judged as a successful single-feature match.

[0091] Step S4: Compliance determination of inner liner and contents. The extracted overall features are compared with the database template. If the matching degree is ≥90%, the identity of the disposable degradable inner liner 16, the contents, and the water level are determined to be compliant. If the matching degree is insufficient, the device will be locked immediately and an alarm will be triggered.

[0092] Step S5: Secondary verification of the magnetic heating element reads the signal of the central single-point magnetic flux sampling element to verify whether there is a compliant magnetic heating element 17 in the central 38mm to 52mm area, and further confirms the placement status of the disposable degradable inner liner 16, forming a triple verification interlock of kettle contact detection, radar identification, and electromagnetic coupling.

[0093] Step S6: Dynamic power adjustment heating combines real-time water temperature and water level status to dynamically adjust the output power of the closed embedded electromagnetic heating module 4. The specific strategy is as follows:

[0094] When the water temperature At that time, it heats up rapidly at 100% rated power;

[0095] When the water temperature At the same time, the water surface fluctuation frequency is monitored in real time through the 24G-FMCW radar safety water level detection and inner tank identification component 6. ;

[0096] When the frequency of water surface ripples Greater than the preset threshold When the liquid level stabilizes, reduce the output power to 50% to 80% and then restore full power heating to achieve dynamic overflow prevention.

[0097] Step S7: Full-process safety monitoring. The status of the temperature control protection component and the anti-dry burning fuse component is monitored in real time throughout the process. In case of abnormal temperature, dry burning or other abnormal situations, the heating output of the closed embedded electromagnetic heating module 4 is immediately cut off to ensure the safe use of the equipment.

[0098] In actual use, the disposable biodegradable inner liner 16 is placed into the detachable matching kettle 3. The positioning groove 18 at the bottom of the disposable biodegradable inner liner 16 automatically fixes the magnetic heating element 17 in the center position, achieving mechanical centering. The detachable matching kettle 3 is pushed into the main unit's heating chamber 14, and the disposable biodegradable inner liner 16 is further fixed by the elastic limiting groove inside the detachable matching kettle 3, while simultaneously pushing the elastic contacts on both sides to conduct. After the equipment detects the contact conduction, it activates the 24G-FMCW radar safety water level detection and inner liner identification component 6, sequentially completing multi-modal verification of the disposable biodegradable inner liner 16's identity, water level detection, and liquid type discrimination. After all verifications pass, the closed embedded electromagnetic heating module 4 is activated, driving the magnetic heating element 17 at the bottom of the disposable biodegradable inner liner 16 to generate eddy currents through the central magnetic field, heating the water inside the disposable biodegradable inner liner 16.

[0099] During the heating process, the system dynamically adjusts the power based on water temperature and liquid level fluctuations, while continuously monitoring the temperature and water level. When the water temperature reaches the set value or the user actively stops the process, the heating output of the enclosed embedded electromagnetic heating module 4 is cut off, completing the drinking water heating process. The disposable biodegradable inner liner 16 can be directly discarded after use and is completely compostable in the industrial sector. The electromagnetic heating device itself does not come into contact with the water and requires no cleaning or disinfection, achieving a clean drinking water effect with single use and no cross-contamination.

Claims

1. A disposable clean drinking water system based on settling tank limiting and multimodal recognition, characterized in that, Includes a matching electromagnetic heating device and a disposable biodegradable inner liner (16); The bottom of the disposable biodegradable inner liner (16) is integrally formed with a positioning groove (18), and the magnetic heating element (17) is fixed inside the positioning groove (18); The supporting electromagnetic heating equipment includes a main unit shell (1), a touch operation panel (2), a detachable matching kettle (3), a closed embedded electromagnetic heating module (4), a temperature control protection component, an anti-dry burning fuse component, a control motherboard, a kettle contact detection component (5), a 24G-FMCW radar safety water level detection and inner liner identification component (6), and an inner liner elastic limit fixing structure (7). The enclosed embedded electromagnetic heating module (4) is sealed and encapsulated inside a sealed plastic cavity at the bottom of the host, including a digital IGBT inverter motherboard, a high-frequency resonant capacitor bank (9), a dual-circuit inner dense outer sparse magnetic coil disk (10), a central cylindrical manganese zinc ferrite magnetic column (11), and a central single-point magnetic flux sampling element. The enclosed embedded electromagnetic heating module (4) generates a heating magnetic field only for the magnetic conductor within a circular area of ​​38mm to 52mm in the center; the 24G-FMCW radar safety water level detection and inner liner identification component (6) emits frequency-modulated continuous waves toward the bottom of the disposable degradable inner liner (16) and receives reflected echoes; the control motherboard has a built-in characteristic echo database of the combination structure of the positioning groove (18) and the magnetic heating element (17). The control motherboard synchronously completes the identity verification, liquid type identification and water level detection of the disposable degradable inner liner (16) based on the echo signal collected by the 24G-FMCW radar safety water level detection and inner liner identification component (6); the closed embedded electromagnetic heating module (4) can start heating only when all three verifications are passed.

2. The disposable clean drinking water system based on settling tank limiting and multimodal recognition according to claim 1, characterized in that, The positioning groove (18) is a sunken groove with a depth of 0.25mm to 0.35mm and a diameter that is 0.8mm to 1.2mm larger than the outer diameter of the magnetic heating element (17). The flatness tolerance is ≤0.03mm. During the heating process, the positioning groove (18) works in conjunction with the inner liner elastic limiting and fixing structure (7) to ensure that the offset between the magnetic heating element (17) and the heating center is ≤1mm and the magnetic field coupling loss is ≤8%.

3. The disposable clean drinking water system based on settling tank limiting and multimodal recognition according to claim 1, characterized in that, The kettle contact detection component (5), the 24G-FMCW radar safety water level detection and inner liner identification component (6), and the central single-point magnetic flux sampling element constitute a triple verification and interlocking mechanism of contact conduction, radar multi-modal identification, and central magnetic flux sampling.

4. A disposable clean drinking water system based on settling tank limiting and multimodal recognition according to claim 1, characterized in that, The magnetic heating element (17) adopts any one of the following three schemes: Option 1: Use annealed soft SUS441 ferritic stainless steel sheet (21) with a thickness of 0.27mm to 0.28mm. The outer ring is set with R1.2 full round corners and a 2.2mm wide non-perforated edge sealing area is reserved. The inner side of the edge sealing area adopts equilateral triangle staggered round holes with a hole diameter of 2mm, a horizontal center distance of 3mm, an oblique center distance of 2.6mm, and an opening rate of 34.5% to 35%. The sheet is passivated with nitric acid on one side and has a dyne value ≥42. Option 2: Use soft 430 ferritic stainless steel sheet (22) with a thickness of 0.25mm or 0.28mm. It is a solid, non-perforated whole sheet structure. The sheet is passivated by high temperature nitric acid and sealed with micropores. Option 3: Iron-chromium-niobium alloy powder sheet (23) is formed by pressing iron-chromium-niobium alloy powder. The composition ratio is 91.5% iron, 7.8% chromium and 0.7% niobium. It does not contain nickel and has a dense and porous overall structure.

5. A disposable clean drinking water system based on settling tank limiting and multimodal recognition according to claim 1, characterized in that, The dual-loop inner dense outer sparse magnetic coil disk (10) is divided into two independent electrical circuits: the inner ring resonant winding (12) and the outer ring magnetic coil winding (13); the central cylindrical manganese zinc ferrite magnetic column (11) is vertically fixed at the center of the dual-loop inner dense outer sparse magnetic coil disk (10), which gathers the magnetic lines of force and confines them within a circular area of ​​38mm to 52mm.

6. A disposable clean drinking water system based on settling tank limiting and multimodal recognition according to claim 1, characterized in that, The kettle contact detection component (5) is symmetrically arranged on the left and right sides of the main heating chamber (14) and consists of a pair of elastic conductive contacts. The compression stroke of the contacts is linked to the depth of the limiting slot of the disposable degradable inner liner (16). Only when the disposable degradable inner liner (16) is fully embedded in the slot, the matching kettle (3) can be completely pushed into the main heating chamber (14), and the contacts on both sides are synchronously connected, will the control motherboard allow the 24G-FMCW radar safety water level detection and inner liner identification component (6) to start the identification process.

7. A disposable clean drinking water system based on settling tank limiting and multimodal recognition according to claim 1, characterized in that, The 24G-FMCW radar safety water level detection and inner tank identification component (6) is vertically installed on the top of the main unit, directly above the center of the detachable matching kettle (3), and adopts a distance threshold type 24G-FMCW radar module; a 2mm thick food-grade PTFE Teflon wave-transparent sealing window (15) is set at the bottom of the component; the component realizes water level detection through preset high and low water level distance thresholds: when there is no water reflection signal at both high and low water level points, it is determined to be a dry burning and water shortage state; when water is detected at the low water level point and not detected at the high water level point, it is determined to be a safe water level; when water is detected at both high and low water level points, it is determined to be a risk of overflow.

8. A disposable clean drinking water system based on settling tank limiting and multimodal recognition according to claim 1, characterized in that, The control motherboard has a built-in positioning sink (18)-magnetic heating element (17) and a dual-feature echo database of water reflection waves, storing the characteristic parameters of the disposable degradable inner liner (16) and the dielectric response model of clear water at different temperatures; after the 24G-FMCW radar collects the echo, the control motherboard performs FFT fast Fourier transform on the echo signal to extract three types of features: time delay, intensity, and phase. The Euclidean distance algorithm is used to match the measured features with the database template. The calculation formula is as follows: ； The characteristic Euclidean distance of the echo; These are the measured echo delay characteristic values; The latency characteristic value of the database standard template; These are the measured characteristic values ​​of the echo intensity; The strength characteristic value of the database standard template; These are the measured echo phase characteristic values; The phase eigenvalues ​​of the database standard template; when satisfying When this happens, it is determined that a single set of features has been successfully matched; When the overall features match the database template by ≥90%, it is determined to be a suitable disposable degradable inner liner (16).

9. A disposable clean drinking water system based on settling tank limiting and multimodal recognition according to claim 1, characterized in that, The inner liner elastic limiting and fixing structure (7) includes an annular elastic limiting slot that can be detached from the inner cavity of the matching kettle (3) and integrally formed, while limiting the horizontal radial offset and vertical floating of the disposable degradable inner liner (16); after the disposable degradable inner liner (16) is placed, it is completely positioned by the slot, ensuring that the magnetic heating element (17) at the bottom center is coaxial with the cylindrical manganese zinc ferrite magnet column (11) at the bottom center.

10. A disposable clean drinking water system based on settling tank limiting and multimodal recognition according to claim 1, characterized in that, The disposable biodegradable inner liner (16) is made of food-grade sugarcane bagasse fiber under high pressure and molded in one piece. The bottom is thickened to 1.5mm to 1.7mm. The magnetic heating element (17) is fixed inside the positioning sink (18) by a food-grade adhesive layer (19) and then covered with a PLA biodegradable coating layer of kraft paper (20). The magnetic heating element (17) is only arranged in a circular area of ​​38mm to 52mm in the center of the bottom. There is no magnetic metal in the rest of the disposable biodegradable inner liner (16).

11. A control method for a disposable clean drinking water system based on settling tank limiting and multimodal recognition, characterized in that, The system described in any one of claims 1 to 10 is implemented by comprising the following steps: Step S1: Container positioning verification. The kettle contact detection component (5) checks whether the detachable matching kettle (3) is in place. When the contacts on both sides are simultaneously connected, it is determined that the disposable degradable inner liner (16) and the detachable matching kettle (3) are in place, and the 24G-FMCW radar safety water level detection and inner liner identification component (6) is activated to enter the detection process; if the contacts are disconnected, the heating circuit remains locked. Step S2: Echo signal acquisition. The 24G-FMCW radar safety water level detection and inner liner identification component (6) transmits frequency-modulated continuous waves to acquire the reflected echo signals from the positioning sink (18), magnetic heating element (17), and liquid surface at the bottom of the disposable degradable inner liner (16). Step S3: Echo feature analysis. Perform FFT (Fast Fourier Transform) on the echo signal to extract three types of feature parameters: time delay, intensity, and phase. Use the Euclidean distance algorithm for feature matching. When D ≤ 0.15, it is determined that a single feature match is successful. Step S4: Compliance determination of inner liner and contents. The extracted overall features are compared with the database template. If the matching degree is ≥90%, the identity of the disposable degradable inner liner (16), the contents, and the water level are determined to be compliant. If the matching degree is insufficient, the equipment will be locked immediately and an alarm will be triggered. Step S5: Secondary verification of the magnetic heating element (17), read the signal of the central single-point magnetic flux sampling element, and verify whether there is a compliant magnetic heating element (17) in the circular area of ​​38mm to 52mm in the center, forming a triple verification interlock of kettle contact detection, radar identification, and electromagnetic coupling; Step S6: Dynamic power adjustment heating, combined with real-time water temperature and water level status, dynamically adjusts the output power of the closed embedded electromagnetic heating module (4): when the water temperature At that time, it heats up rapidly at 100% rated power; when the water temperature... At the same time, the water surface fluctuation frequency is monitored in real time by the 24G-FMCW radar safety water level detection and inner tank identification component (6). When the frequency of water surface fluctuations Greater than the preset threshold When the liquid level stabilizes, reduce the output power to 50%–80% and then restore full power heating. Step S7: Full-process safety monitoring, real-time monitoring of the status of temperature control protection components and anti-dry burning fuse components. If abnormal temperature or dry burning occurs, immediately cut off the heating output of the enclosed embedded electromagnetic heating module (4).

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