A thermistor device cavity and a method for temperature monitoring and anti-fuse protection in small household appliances

Abstract

This invention provides a thermistor device cavity and a method for temperature monitoring and anti-fussing of small household appliances. It includes a heating plate temperature measuring point, a thermistor, a thermal fuse, and a thermistor bead inside the thermal fuse. The front of the thermistor contacts the heating plate temperature measuring point, and the back contacts the thermal fuse device cavity. Both the thermistor device cavity and the thermal fuse device cavity are located inside an insulating shell. This invention detects temperature changes in the heating plate and controls the operating temperature of the thermal fuse. Utilizing a heat transfer and thermal balance system, it detects temperature changes in the liquid inside the small household appliance's capacitor, simulating a thermostat function to prevent the capacitor from dry-burning and to prevent abnormal fuse melting during appliance operation. This replaces the traditional solution of a thermostat, sensor, thermal fuse, or heating plate, temperature sensor, and two thermal fuses. It conforms to safety standards, reduces production material and assembly costs, and prevents abnormal fuse melting during appliance operation, thus reducing maintenance and after-sales costs.

Description

Technical Field

[0001] This invention relates to the field of household appliance temperature safety technology, and in particular to a thermistor device cavity and a method for temperature monitoring and anti-melting of small household appliances. Background Technology

[0002] In traditional small household appliance heating safety protection systems, the most common method is heating with a heating element. The most common safety module to protect the safe operation of small appliances is either a heating element + thermostat + temperature sensor + thermal fuse, or a heating element + temperature sensor + two thermal fuses. When the water in an electric steamer boils dry, the temperature rises rapidly. Although the NTC (electronic control system) can detect this, if the main control chip malfunctions, it cannot cut off the power. At this time, the mechanical thermostat will act as an independent protection device, cutting off the power to prevent the pot from being damaged by overheating or causing a fire. The thermal fuse (temperature fuse) is the ultimate safety line, its main function being final protection. This is the last and most decisive safety line. When the NTC and thermostat (the first mechanical protection) fail unexpectedly, and the temperature continues to rise to an extremely dangerous level, the thermal fuse will melt. Once melted, it cannot be restored and must be replaced by a professional. When a traditional heating element stops heating, there will still be some residual heat. At this time, the mechanical temperature controller will activate and cut off the power. The ambient temperature of the thermal fuse will rise with the residual heat, reaching the thermal protection temperature of the thermal fuse, but not reaching the thermal fuse's activation and melting temperature. However, this thermal protection temperature of the thermal fuse also has a limited lifespan. If its lifespan is exceeded, there is a risk of the thermal fuse unexpectedly melting, causing defects in small household appliances.

[0003] However, traditional thermostats and temperature sensors, along with thermal fuses, are assembled as independent units on the bottom of the heating plate. The heating element then bends to generate heat, resulting in variations in temperature at different assembly points on the heating plate base, varying distances from the heating element, and thus different temperature rises. This creates a conflict between production and safety technologies. Existing thermal fuses on the market have an activation fuse temperature, a limit temperature, and a thermal protection temperature. For example, a 10A 184℃ 250V fuse indicates an activation fuse at the 184℃ thermal protection temperature (184℃ - 15℃ = 169℃). Even after exceeding this thermal protection temperature for 24 hours, there is a risk of melting. When using small household appliances, if the temperature is too low, the thermal fuse may melt prematurely; if the temperature is too high, the heating plate temperature may continue to rise to an extremely dangerous level, leading to a safety accident. This conflict between these two factors has become an irreconcilable technical pain point in the industry. Consequently, consumers sometimes experience abnormal thermal fuse melting when using small household appliances, resulting in the product not receiving power and becoming unusable.

[0004] In addition, due to the characteristics of the heating plate heating method, there is still a certain residual temperature rise when the heating plate stops heating. Therefore, traditional safety technologies cannot monitor the temperature of the thermal fuse. Temperature sensors can only monitor the temperature of a certain point on the heating plate being tested. The different assembly points of the heating plate chassis and the different temperature points of the heating tubes at different distances result in different temperature rises. Consumers' misoperation when using small household appliances, such as dry burning, prolonged repeated use, or forgetting to turn off the appliance after use, etc., further increase the risk of premature melting of the thermal fuse of small household appliances. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a method for monitoring the temperature of a thermistor device cavity and preventing the thermistor from melting prematurely, which can detect the temperature change of the liquid inside the thermistor, prevent dry burning, and prevent the thermal fuse from melting prematurely during the use of the thermistor.

[0006] To achieve the above objectives, the present invention provides the following solution: a thermistor device cavity, comprising a heating plate temperature measuring point, a thermistor, a thermal fuse, and a thermistor bead disposed inside the thermal fuse. The front of the thermistor contacts the heating plate temperature measuring point, and the back of the thermistor contacts the thermal fuse device cavity. Both the thermistor device cavity and the thermal fuse device cavity are disposed inside an insulating shell.

[0007] Optionally, the insulating housing is disposed inside the fixing member, and the insulating housing is provided with a first cavity through groove and a second cavity through groove disposed below the first cavity through groove, and a thermal window is provided on one side of the top of the first cavity through groove.

[0008] Optionally, a temperature sensor and an insulating plug are provided inside the first cavity through groove. The temperature sensor includes a temperature sensing element disposed below the thermal sensing window and leads disposed on both sides of the temperature sensing element.

[0009] This invention also provides a method for temperature monitoring and anti-fuse protection of small household appliances, including: When the small household appliance is powered on, the thermistor is used to detect the temperature of the heating plate in real time and control the ambient temperature of the thermal fuse. Then, according to different temperature thresholds, the control board is used to control the liquid temperature, reduce power, provide dry burning warning, and stop and restart, thus completing the temperature control cycle and protection. The main chip controls a single NTC for double-sided detection and multi-level temperature control protection. By analyzing the heating characteristics of the heating element—whether the container contains liquid, is empty, or the liquid is boiling—different temperature ranges are detected to simulate different working environments. Specifically: when the container contains liquid, the heating element conducts heat to the thermistor through both the heating element and the liquid, thus its heat dissipation method includes air radiation and liquid boiling evaporation. When the container contains liquid or is empty, the heating element conducts heat to the thermistor through the heating element and the insulating cavity, also using air radiation to simulate different small household functional scenarios. By utilizing different heat conduction structures and heat dissipation methods, various temperature safety protection functions are simulated. The electronic control program precisely controls the operating environment temperature of the thermal fuse to be lower than the thermal protection temperature of the thermal fuse. When the temperature exceeds or approaches the thermal protection temperature of the thermal fuse, the small household appliance control program self-locks, completing the safety temperature protection of the small household appliance.

[0010] Optionally, the small appliance is powered on and operated, using a thermistor to detect the heating element temperature in real time and control the ambient temperature of the thermal fuse. Then, based on different temperature thresholds, the control board controls the liquid temperature, reduces power, issues a dry-burn warning, and initiates a shutdown and restart, completing the temperature control cycle and protection. This also includes: Based on the combination of segmented temperature information and simulated environment, the small household appliances are powered on and operated. The thermistor is used to detect the heating plate's operating temperature and control the ambient temperature of the thermal fuse when the small household products are powered on, so that the ambient temperature of the thermal fuse is lower than the thermal protection temperature of the thermal fuse. The first stage simulates the normal working environment through the circuit control board and NTC temperature detection, and completes the basic temperature control cycle operation under normal conditions. The second stage simulates the function of a temperature controller through the circuit control board and NTC temperature detection. If the liquid in the container evaporates, or if the container is dry-burned, empty-burned, or subjected to prolonged temperature cycling heating, an abnormal temperature information will be displayed and heating will stop until the machine is restarted and cycle heating will resume. This completes the safety protection function of the small household appliance. Artificial intelligence is needed to take over and control the small household appliance to restore it to normal. The third stage uses the circuit control board and NTC to detect the temperature of the simulated thermal fuse operating environment and controls the operating environment temperature to be lower than the thermal equilibrium temperature of the fuse. Specifically, it checks whether the temperature detected by the thermistor is greater than or equal to 145℃. If so, it displays a high temperature abnormality alarm message, forces the relay to intermittently disconnect the circuit, and cools the ambient temperature to below 40℃. Then, it presses and holds the power button for 10 seconds until the relay conduction function is unlocked, forcibly protecting the thermal fuse from operating temperatures below the thermal protection temperature of the fuse.

[0011] This invention discloses the following technical effects by providing a thermistor device cavity and a method for temperature monitoring and anti-fuse protection of small household appliances: This technology solves the problem of abnormal melting of thermal fuses during consumer use in small household appliances' temperature protection systems. The front of the temperature sensor houses the heating element's temperature detection point, while the back contains the thermal fuse, integrating monitoring and measurement functions. When the thermistor is operating normally, it not only monitors the temperature of the liquid inside the pot but also detects the operating temperature within the secondary chamber. By implementing both measurement and monitoring functions using the same device, errors caused by different testing equipment and varying assembly methods are reduced.

[0012] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structural assembly provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the device structure provided in an embodiment of the present invention; Figure 3 An exploded view of the insulating shell provided in an embodiment of the present invention; Figure 4 A perspective view of the insulating housing provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the method flow provided in an embodiment of the present invention; Explanation of reference numerals in the attached drawings: 1. Heating plate; 2. Fixing component; 3. Insulating housing; 4. Temperature sensor; 5. Thermal fuse; 6. First cavity through slot; 7. Second cavity through slot; 8. Thermistor bead; 9. Insulating connecting sleeve; 10. Insulating plug; 11. Thermal window. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 , Figure 2 As shown, the present invention provides a thermistor device cavity, including a heating plate temperature measuring point, a thermistor, a thermal fuse 5, and a thermistor bead 8 disposed inside the thermal fuse 5. The front of the thermistor contacts the heating plate temperature measuring point, and the back of the thermistor contacts the thermal fuse device cavity. Both the thermistor device cavity and the thermal fuse device cavity are disposed inside the insulating shell 3. Based on different product applications and actual functions, a segmented temperature simulation setting is adopted. During normal operation (when the temperature does not exceed the warning temperature), the front of the thermistor contacts the temperature measuring point of the heating plate to simulate the temperature measurement inside the fuse cavity. When the temperature is abnormal (when the temperature reaches the product warning temperature or is about to reach the thermal protection temperature of the thermal fuse), the front of the thermistor contacts the temperature measuring point of the heating plate, and the back contacts the thermal fuse cavity. Therefore, the thermistor and the MIC work together to control the circuit (simulating the function of the traditional temperature controller) to control the on and off of the circuit. However, the back of the thermistor contacts the thermal fuse cavity, further controlling the ambient temperature of the thermal fuse to not exceed the thermal protection temperature of the fuse, thus increasing the service life of the thermal fuse. In the product safety design, when the thermistor fails, the thermal fuse (thermal bead) melts, becoming the ultimate safety defense for permanent power failure protection, while solving the uncontrollable factors of the working environment of the traditional thermal fuse (thermal bead).

[0018] The insulating housing 3 is disposed inside the fixing member 2 and is adapted to the inner side of the fixing member 2. The insulating housing 3 is provided with a first cavity through groove 6 and a second cavity through groove 7 disposed below the first cavity through groove 6. A thermal window 11 is provided on one side of the top of the first cavity through groove 6.

[0019] like Figure 3 , Figure 4 As shown, a temperature sensor 4 and an insulating plug 10 are disposed inside the first cavity through groove 6. The temperature sensor 4 includes a temperature sensing element disposed below the thermal sensing window 11 and leads disposed on both sides of the temperature sensing element. The first cavity through groove 6 is through at both ends, and the two leads of the temperature sensor 4 are arranged side by side. The temperature sensing element of the temperature sensor 4 is located between the two leads. The two leads extend from the end with the smaller cross-section of the first cavity through groove 6, and the end with the larger cross-section of the first cavity through groove 6 is sealed with an insulating plug 10, which abuts against the temperature sensing element.

[0020] like Figure 3 , Figure 4As shown, the thermal fuse 5 and the insulating connecting sleeve 9 are disposed inside the second cavity through groove 7. The thermal fuse 5 has an operating temperature of 184℃ and a working temperature of 169℃. The thermal fuse 5 contains a thermistor 8, and the connecting sleeve contains a thermistor. The second cavity through groove 7 is open at both ends. The insulating connecting sleeve 9 is disposed at the end of the second cavity through groove 7 with the larger cross-section. One end of the thermal fuse 5 passes through the insulating connecting sleeve 9 and is led out, while the other end of the thermal fuse 5 passes through the end of the second cavity through groove 7 with the larger cross-section and is led out.

[0021] The temperature monitoring and thermal fuse module is as follows: Inside the insulating housing 3, there are cavity for a thermistor and cavity for a thermal fuse 5, respectively housing the thermistor and the thermal fuse 5. The thermistor wafer and the thermal fuse 5 each contain a thermistor bead 8 and a temperature measuring point for the heating plate, arranged vertically in a straight line. This allows the thermistor to have bidirectional monitoring and detection capabilities: firstly, it can detect temperature changes at the heating plate's measuring point; secondly, it can detect the operating temperature of the thermistor bead 8 within the thermal fuse 5. A ceramic insulating wall separates the thermistor and the thermal fuse 5, separating their strong and weak electrical components. An exposed window is provided between the thermistor cavity and the heating plate's measuring point, allowing the thermistor glass body to directly seal and contact the measuring point with high-temperature insulating adhesive. This ensures both the reliability of the thermistor's insulation and its temperature measuring sensitivity. Therefore, the integrated design of the insulating housing 3 provides a strong physical structural foundation, making the temperature monitoring and anti-fuse method for small household appliances more reliable and stable.

[0022] A ceramic insulating wall is provided between the thermistor and the thermal fuse to separate the strong and weak electrical components. A crystal exposed window is provided between the cavity of the thermistor body and the temperature measuring point of the heating plate. The thermistor glass body is directly sealed to the temperature measuring point of the heating plate by high-temperature insulating glue, which ensures both the reliability of the thermistor insulation and the sensitivity of the thermistor temperature measurement.

[0023] The thermistor device cavity adopts a three-dimensional stacked design structure, integrating the heating plate temperature measuring point, thermistor, thermal fuse 5, and the internal thermal overload device thermistor bead 8 into a three-dimensional monitoring point. Therefore, an exposed window for the thermistor crystal is provided at the insulating cavity and the heating plate temperature measuring point. The thermistor body is used as a glass body as an insulator, and insulating thermally conductive adhesive is filled to allow the glass body at the thermistor wafer to directly contact the heating plate temperature measuring point, thereby reducing the medium that is ineffective for heat conduction, improving the sensitivity of the thermistor temperature measurement, and ensuring its insulation strength. The temperature of the liquid in the pot and the working environment temperature of the thermal fuse thermistor bead 8 are simulated and tested using the principle of heat flow transfer and thermal balance system. The temperature curve change value is used to verify whether there is water or not, or whether the water volume is very small. According to the law of conservation of energy, for objects of equal mass and volume, the time to heat to 70 degrees with the same power is within a consistent range.

[0024] Through extensive experimental data and verification, the range of time it takes for the temperature of a thermistor to rise from 40 degrees to 70 degrees is stored in the main control chip (MCU) to detect whether small household appliances are running dry. This eliminates the need for the heating plate to heat up (105 degrees to 140 degrees), thus preventing damage to the appliance's connection structure and components. It also further prevents the risk of premature fuse failure caused by consumer misoperation, greatly reducing after-sales maintenance costs during the use of small household products.

[0025] Therefore, it can be concluded that as long as the temperature sensor 4 of this invention does not fail, the thermal protection temperature of the thermal fuse 5 will not be reached. This solves the risk of premature thermal fuse 5 being abnormally blown by human error due to methods such as dry burning, long-term repeated use in traditional small household appliances.

[0026] like Figure 5 As shown, the present invention also provides a method for temperature monitoring and anti-fuse protection of small household appliances, including: Step 1: Power on the small appliance and use a thermistor to monitor the heating element temperature in real time. Control the ambient temperature of the thermal fuse, and then, according to different temperature thresholds, use the wired control board to control the liquid temperature, reduce power, trigger a dry-burning warning, and shut down and restart, completing the temperature control cycle and protection. Specifically, this includes: When small household appliances are powered on, the thermistor is used to detect the heating plate's operating temperature and control the ambient temperature of the thermal fuse when the small household appliances are powered on. The circuit control board determines whether the water temperature is greater than or equal to 98℃. If so, heating is stopped. If the water temperature is less than or equal to 80℃, the heating cycle is started to complete the basic temperature control cycle operation under normal working conditions. The circuit control board determines whether the temperature rise of the heating plate's measuring point has reached 105℃. If so, heating is stopped and the power is reduced until the water temperature cools down to 80℃, then heating is repeated. The circuit control board determines whether the temperature rise of the heating plate's measuring point has reached 110℃. If so, a dry-burning warning message is displayed, and heating is stopped and the power is reduced until the water temperature cools down to 80℃, then heating is repeated. The circuit control board determines whether the temperature rise of the heating plate's measuring point has reached 120℃. If so, a temperature abnormality message is displayed, and heating is stopped until the machine is restarted, then heating is repeated, thus completing the safety protection operation.

[0027] Specifically: The selected thermal fuse has an activation temperature of 184 degrees Celsius and an operating temperature of 169 degrees Celsius. Based on the software algorithm and structural characteristics, three measurement points are aligned on a single three-dimensional line. The thermistor controls the highest temperature point to be 120 degrees Celsius, plus the 10-20 degree Celsius overshoot from the residual heat of the heating plate. This passively generates a protection program. When the sensor and software are working normally, the heating plate cannot heat up to 169 degrees Celsius, let alone reach the instantaneous melting temperature of 184 degrees Celsius for the thermal fuse. However, the structural thermistor simultaneously detects the temperature of the heating plate and the thermistor bead of the thermal fuse; therefore, an additional... An over-temperature self-locking program is set up. When the thermistor detects 145 degrees Celsius, the residual temperature of the heating plate is likely to approach the critical full-load operating temperature of the thermal fuse (169 degrees Celsius). At this point, a high-temperature abnormality alarm is displayed, and the program activates the thermal fuse self-protection program. The switching circuit controls the relay to intermittently disconnect the circuit. The circuit needs to be cooled to below 40 degrees Celsius and the power button needs to be pressed and held for 10 seconds to restore the switching circuit control of the relay circuit. The thermistor thus enables the present invention to protect the thermal fuse from premature melting during normal operation, reducing its maintenance and replacement costs.

[0028] Step 2: Use the main chip to control the single NTC to perform multi-temperature detection and multi-level temperature control protection, and combine the structure and over-temperature self-locking program to complete the safe temperature protection of small household appliances.

[0029] Over-temperature self-locking protection includes: determining whether the temperature detected by the thermistor is greater than or equal to 145℃. If so, it displays a high temperature abnormality alarm message, forces the relay to intermittently disconnect the circuit, and cools the water temperature to below 40℃. Then, press and hold the power button for 10 seconds to activate the relay.

[0030] Specifically: Through the main chip control program, the same NTC at different temperature ranges simulates and tests the liquid temperature inside the pot and controls the heating plate temperature. It also monitors the ambient temperature of the thermal fuse and simulates an anti-dry-burning function, promptly reducing power to prevent the heating plate from overheating and causing the thermal fuse to blow unexpectedly. This replaces the traditional functional thermostat or dual thermal fuse safety function. The software-based evaluation method controls the water temperature to 98 degrees Celsius, stopping heating and cooling to 80 degrees Celsius to start cyclic heating. When the heating plate temperature reaches 105 degrees Celsius, the heating plate stops heating and reduces power by 10% to cool to 80 degrees Celsius and starts cyclic heating. When the heating plate temperature reaches 110 degrees Celsius, the program displays a dry-burning warning and stops heating. Subsequent cyclic heating reduces power by 30% and cools to 80 degrees Celsius to start cyclic heating. When the heating plate temperature reaches 120 degrees Celsius, an abnormal temperature is displayed, heating stops, and a restart is required to restore normal operation. This is the first safety protection feature of this invention; in case of an abnormality, a restart is required to restore the temperature below 80 degrees Celsius. Simultaneously, by utilizing the non-resettable thermistor within the fusible core for ultimate protection, this invention offers a significant cost advantage over traditional small appliance products. It saves on the material costs of a thermostat, a fusible fuse, or a temperature sensor, as well as assembly labor costs, thus representing a breakthrough in safety technology for the entire small appliance industry. However, the double-sided temperature measurement design of the thermistor prevents structural... Figure 3 The entire surface directly transfers heat to the thermistor, meaning the heating plate directly conducts heat to the fuse through the insulation, causing abnormal melting. Based on the double-sided temperature sensing structure of the thermistor, a final over-temperature self-locking program is added. When the thermistor detects 145 degrees Celsius, and the residual temperature of the heating plate is likely close to the fuse's critical full-load operating temperature of 169 degrees Celsius, a high-temperature alarm is displayed, and the fuse's self-protection program is activated. The forced switching circuit controls the relay to intermittently disconnect the circuit. It needs to cool to below 40 degrees Celsius and the power button must be pressed and held for 10 seconds to restore the switching circuit's control of the relay circuit. This solves the problem of traditional solutions failing to detect, monitor, and protect the thermistor's operating temperature within a controllable range. Furthermore, it is monitored by thermistor detection and electronic control programs, combined with insulation heat accumulation treatment, heat dissipation treatment, and residual temperature impact protection of the heating plate, forming a comprehensive small appliance safety temperature protection system. It complies with 3C, UL, VDE, TUV RSE, and KC multi-national safety certification standards, saving material costs while significantly improving the temperature safety protection technology of small appliances.

[0031] The design employs a three-dimensional superimposed structure, integrating the heating plate temperature measuring point, the thermistor, the thermal fuse, and the internal thermal overload device (thermistor bead) into a single three-dimensional monitoring point. Therefore, an exposed window for the thermistor crystal is provided at the insulating cavity and the heating plate temperature measuring point. The thermistor body itself is used as a glass insulator, filled with insulating thermally conductive adhesive, allowing direct contact between the glass at the thermistor wafer and the heating plate temperature measuring point. This reduces the amount of heat-ineffective medium, improves the thermistor's temperature measurement sensitivity, and ensures its insulation strength. The temperature of the liquid inside the pot is simulated and tested using the principles of heat flow transfer and thermal balance. The working environment temperature of the thermal fuse (thermistor bead) is verified by the temperature curve changes, indicating the presence or absence of water, or a very small amount of water. According to the law of conservation of energy, for objects of equal mass and volume, the time required to heat to 70 degrees Celsius with the same power is within a consistent range. Through extensive experimental data and verification, the range of time it takes for the thermistor temperature to rise from 40 degrees to 70 degrees is stored in the main control chip (MCU) to detect whether small household appliances are running dry. This eliminates the need for the heating plate to heat up (105 degrees to 140 degrees), thus preventing damage to the appliance's connection structure and components. It also further prevents the risk of premature fuse failure caused by consumer misoperation, greatly reducing after-sales maintenance costs during the use of small household products.

[0032] Therefore, it can be concluded that as long as the temperature sensor of this invention does not fail, the temperature environment at which the thermal fuse will not melt will not be reached. This solves the risk of premature melting of the thermal fuse caused by human error in traditional small household appliances, such as dry burning, long-term repeated use.

[0033] Therefore, by providing a method for monitoring the temperature of a thermistor device cavity and preventing the melting of small household appliances, the present invention can detect changes in the liquid temperature inside the small household capacitor, prevent dry burning, and prevent abnormal melting of the thermal fuse when the small household appliance is in use.

[0034] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0035] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A thermistor device cavity, characterized in that, It includes a heating plate temperature measuring point, a thermistor, a thermal fuse, and a thermistor bead disposed inside the thermal fuse. The front of the thermistor contacts the heating plate temperature measuring point, and the back of the thermistor contacts the thermal fuse device cavity. Both the thermistor device cavity and the thermal fuse device cavity are disposed inside an insulating shell.

2. The thermistor device cavity according to claim 1, characterized in that, The insulating housing is disposed inside the fixing member. The insulating housing is provided with a first cavity through groove and a second cavity through groove disposed below the first cavity through groove. A thermal window is provided on one side of the top of the first cavity through groove.

3. The thermistor device cavity according to claim 2, characterized in that, The first cavity through groove is equipped with a temperature sensor and an insulating plug. The temperature sensor includes a temperature sensing element located below the thermal sensing window and lead wires located on both sides of the temperature sensing element.

4. A method for temperature monitoring and anti-fuse protection of small household appliances, characterized in that, include: When the small household appliance is powered on, the thermistor is used to detect the temperature of the heating plate in real time and control the working environment temperature of the thermal fuse. Then, according to different temperature thresholds, the wired control board performs water control, power reduction, dry burning warning, shutdown and restart to complete the temperature control cycle and protection. The main chip controls a single NTC for double-sided detection and multi-level temperature control protection. By detecting the heating characteristics of the heating plate, different temperature ranges are detected when there is liquid in the container, when there is no liquid, and when the liquid is boiling, simulating different working environments. When the temperature exceeds or approaches the heat preservation temperature of the hot melt, the small appliance control program self-locks to complete the safety temperature protection of the small appliance.

5. A method for temperature monitoring and anti-fuse protection of small household appliances according to claim 4, characterized in that, When the small appliance is powered on, the thermistor is used to detect the temperature of the heating plate in real time and control the ambient temperature of the thermal fuse. Then, according to different temperature thresholds, the control board is used to control the liquid temperature, reduce power, provide dry burning warning, and shut down and restart, thus completing the temperature control cycle and protection. This includes: based on the combination of segmented temperature information and simulated environment, powering on small household appliances, using thermistors to detect the heating plate's operating temperature, and controlling the ambient temperature of the thermal fuse when the small household products are powered on, so that the ambient temperature of the thermal fuse is lower than the thermal protection temperature of the thermal fuse. The first stage simulates the normal working environment through the circuit control board and NTC temperature detection, and completes the basic temperature control cycle operation under normal conditions. The second stage simulates the function of a temperature controller through the circuit control board and NTC temperature detection. If the liquid in the container evaporates, or if the container is dry-burned, empty-burned, or subjected to prolonged temperature cycling heating, an abnormal temperature information will be displayed and heating will stop until the machine is restarted and cycle heating will resume. This completes the safety protection function of the small household appliance. Artificial intelligence is needed to take over and control the small household appliance to restore it to normal. The third stage uses the circuit control board and NTC to detect the temperature of the simulated thermal fuse operating environment and controls the operating environment temperature to be lower than the thermal equilibrium temperature of the fuse. Specifically, it checks whether the temperature detected by the thermistor is greater than or equal to 145℃. If so, it displays a high temperature abnormality alarm message, forces the relay to intermittently disconnect the circuit, and cools the ambient temperature to below 40℃. Then, it presses and holds the power button for 10 seconds until the relay conduction function is unlocked, forcibly protecting the thermal fuse from operating temperatures below the thermal protection temperature of the fuse.

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