Low-voltage direct-current electric stove

Abstract

The utility model discloses a low-voltage direct-current electric stove which comprises an electric stove shell with an opening in the top, a microcrystal heating disc embedded in the opening in the top of the electric stove shell, an aviation socket and a display key module which are installed on the electric stove shell, and a main control board, a heat insulation assembly, a cooling fan and a temperature sensor assembly which are arranged in the electric stove shell. The main control board is electrically connected with the microcrystal heating disc, the aviation socket, the display key module, the cooling fan and the temperature sensor assembly. The heat insulation assembly comprises a mica sheet, heat insulation cotton and an aluminum plate which are sequentially arranged on the back face of the microcrystal heating disc in a stacked mode. The aviation socket is used for inputting low-voltage direct current. The utility model is convenient for outdoor camping and power failure emergency use, is free of open fire and oxidation, and is especially suitable for places where open fire is prohibited.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a low-voltage DC electric cooker. Background Art

[0002] With the improvement of people's living standards and the diversification of leisure styles, the rise of outdoor activities, especially camping and hiking, has greatly promoted the development of the outdoor cooker market. Outdoor cookers not only pursue portability and ease of use, but the most crucial thing is safety. At present, the cookers used for outdoor camping include kerosene stoves, alcohol stoves, and cartridge stoves, all of which use combustible liquids or gases as fuels to heat food through chemical combustion. There will be open flames and odors during use, posing great safety hazards. Content of the Utility Model

[0003] The purpose of the utility model is to provide a low-voltage DC electric cooker, which is convenient for outdoor camping and power outage emergency use, has no open flame and does not oxidize, and is especially suitable for places where open flames are prohibited.

[0004] To achieve the above purpose, the following technical solutions are adopted:

[0005] A low-voltage DC electric cooker includes an electric cooker housing with an opening at the top, a ceramic glass heating plate embedded in the opening at the top of the electric cooker housing, an aviation socket and a display key module installed on the electric cooker housing, and a main control board, a heat insulation component, a cooling fan, and a temperature sensor component built in the electric cooker housing; the main control board is electrically connected to the ceramic glass heating plate, the aviation socket, the display key module, the cooling fan, and the temperature sensor component respectively; the heat insulation component includes a mica sheet, a heat insulation cotton, and an aluminum plate stacked in sequence on the back of the ceramic glass heating plate; the aviation socket is used for inputting low-voltage direct current.

[0006] Preferably, a power supply module, a main control module, a power input module, a power output module, a temperature measurement module, and a fan drive module connected to the main control module respectively are provided on the main control board; the low-voltage direct current input by the aviation socket is output to the power input module, the power output module, and the fan drive module after passing through the power supply module, and is output to the main control module and the temperature measurement module on the other path; the temperature measurement module is connected to the temperature sensor component, and the fan drive module is connected to the cooling fan.

[0007] Preferably, the power input module includes a DC relay; the power output module includes three high-power field effect transistors; the DC relay of the power input module and the three high-power field effect transistors of the power output module form a series circuit and are connected to the power supply circuit of the ceramic glass heating plate.

[0008] Preferably, the main control module includes a microcontroller U1, and the model of the microcontroller U1 is CA51F252L2; the microcontroller U1 is used to output a PWM signal to drive the conduction and shutdown of three high-power field effect transistors of the power output module, so as to control the power-on and power-off of the microcrystalline heating plate.

[0009] Preferably, the temperature sensor assembly includes two first temperature sensors and two high-temperature resistant silica gel caps; a positioning groove adapted to the first temperature sensor is provided at the top of the high-temperature resistant silica gel cap; at least two mounting posts are further provided in the electric furnace shell, and a mounting groove adapted to the high-temperature resistant silica gel cap is provided at the top of the mounting post; the high-temperature resistant silica gel cap is embedded and installed in the mounting groove, and the first temperature sensor is embedded and installed in the positioning groove and its detection head is in contact with the back of the microcrystalline heating plate.

[0010] Preferably, the first temperature sensor is an axial glass-sealed NTC thermistor; two first temperature sensors are provided for measuring the temperature of the microcrystalline heating plate.

[0011] Preferably, the temperature sensor assembly further includes a second temperature sensor welded to the main control board for measuring the temperature of the main control board.

[0012] Preferably, an inorganic conductive resistance film layer is provided on the back of the microcrystalline heating plate; a positive silver paste conductive strip and a negative silver paste conductive strip are printed on the inorganic conductive resistance film layer; the positive silver paste conductive strip and the negative silver paste conductive strip are distributed in a finger-crossed pattern.

[0013] Preferably, the display button module includes a display button board provided on the front side of the microcrystalline heating plate and a power switching switch provided at the bottom of the electric furnace shell; a switch button and several LED indicator lights are provided on the display button board.

[0014] Preferably, an air inlet hole is provided on one side of the bottom of the electric furnace shell, and an air outlet hole is provided on the other side.

[0015] Adopting the above solution, the beneficial effects of the present utility model are as follows:

[0016] The low-voltage DC electric cooker provided by the present utility model is convenient for outdoor camping and power outage emergency use, has no open flame and does not oxidize, and is particularly suitable for use in places where open flames are prohibited. In addition, 1) low-voltage direct current is input through an aviation socket, and no high voltage will be generated inside, avoiding electric shock to the human body; 2) by arranging mica sheets, heat insulation cotton and aluminum plates on the back of the microcrystalline heating plate, the heat generated by the microcrystalline heating plate during operation can be prevented from damaging the cooker; at the same time, the heat dissipation of the cooker can be accelerated through the cooling fan, air inlet hole and air outlet hole to meet the temperature requirements for the normal operation of the cooker; 3) by arranging the first temperature sensor to monitor the temperature of the microcrystalline heating plate and the second temperature sensor to monitor the temperature of the main control board, the reliability of the operation of the microcrystalline heating plate and the main control board is ensured. Description of the Drawings

[0017] Figure 1 is a top - view three - dimensional diagram of the present utility model;

[0018] Figure 2 is a bottom - view three - dimensional diagram of the present utility model;

[0019] Figure 3 is an exploded view of the present utility model;

[0020] Figure 4 is Figure 3 a partially enlarged view at position A in

[0021] Figure 5 is a principle block diagram of the present utility model;

[0022] Figure 6 is a circuit diagram of the main control module, temperature measurement module, and fan drive module of the present utility model;

[0023] Figure 7 is a circuit diagram of the power input module and power output module of the present utility model;

[0024] Figure 8 is a circuit diagram of the power supply module of the present utility model;

[0025] Figure 9 is a schematic diagram of the back structure of the microcrystalline heating plate of the present utility model;

[0026] Among them, the description of the drawing reference numerals:

[0027] 1 - electric furnace housing, 2 - microcrystalline heating plate,

[0028] 3 - aviation socket, 4 - display key module,

[0029] 5 - heat insulation component, 6 - temperature sensor component,

[0030] 7 - power supply module, 8 - main control module,

[0031] 9 - power input module, 10 - power output module,

[0032] 11 - temperature measurement module, 12 - fan drive module,

[0033] 13 - positive silver paste conductive strip, 14 - negative silver paste conductive strip,

[0034] 15 - air inlet hole, 16 - air outlet hole,

[0035] 17 - cooling fan, 41 - display key board,

[0036] 42 - Power switching switch, 51 - Mica sheet,

[0037] 52 - Heat insulation cotton, 53 - Aluminum plate,

[0038] 61 - First temperature sensor, 62 - High-temperature resistant silica gel cap,

[0039] 63 - Mounting post. Detailed implementation mode

[0040] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that, for the sake of description, only the parts related to the present utility model are shown in the drawings, rather than all the structures.

[0041] In the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0042] In the description of this embodiment, the orientation or positional relationship terms such as "above", "below", "left" and "right" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] Referring to Figures 1 to 9 As shown, the present utility model provides a low-voltage DC electric cooker, which includes an electric cooker housing 1 with an opening at the top, a microcrystalline heating plate 2 embedded in the opening at the top of the electric cooker housing 1, an aviation socket 3 installed on the electric cooker housing 1, a display button module 4, and a main control board, a heat insulation component 5, a cooling fan 17, and a temperature sensor component 6 built in the electric cooker housing 1; the main control board is electrically connected to the microcrystalline heating plate 2, the aviation socket 3, the display button module 4, the cooling fan 17, and the temperature sensor component 6 respectively; the heat insulation component 5 includes a mica sheet 51, a heat insulation cotton 52, and an aluminum plate 53 which are sequentially stacked on the back of the microcrystalline heating plate 2. Specifically, the cooling fan 17 is a DC brushless fan.

[0044] Among them, the aviation socket 3 is used to input low-voltage direct current. The aviation socket 3 adopts GX20-4PIN. There are 4 high-temperature resistant wires welded on the aviation socket 3. These 4 high-temperature resistant wires are divided into two groups. When used at high power, both groups have direct current input. When used at low power, only one group has direct current input. The microcrystalline heating plate 2 adopts a far-infrared nano microcrystalline heating plate. The thickness of the microcrystalline heating plate 2 is 5 mm. The four sides of the microcrystalline heating plate 2 are inlaid into the electric furnace shell, and the inlaid depth is 4-5 mm.

[0045] This utility model is powered by low-voltage direct current. The microcrystalline heating plate 2 is used as a heating element, and the power and temperature of the electric cooker are controlled and adjusted by the main control board, which is used for cooking and heating food. Through the aviation socket 3, an energy storage power supply or other DC power supplies can be connected, and it is mainly used as a cooker for outdoor camping and power outage emergency.

[0046] A power supply module 7, a main control module 8, and a power input module 9, a power output module 10, a temperature measurement module 11, and a fan drive module 12 respectively connected to the main control module 8 are provided on the main control board; the low-voltage direct current input by the aviation socket 3 passes through the power supply module 7, and one path is output to the power input module 9, the power output module 10, and the fan drive module 12, and the other path is output to the main control module 8 and the temperature measurement module 11; the temperature measurement module 11 is connected to the temperature sensor assembly 6, and the fan drive module 12 is connected to the cooling fan 17.

[0047] Please continue to refer to Figure 8 , the power supply module 7 generates two-way power outputs of +5V and +12V. The +5V output supplies the main control module 8 and the temperature measurement module 11, and the +12V output supplies the power input module 9, the power output module 10, and the fan drive module 12. Specifically, two-way low-voltage direct currents from the aviation socket 3 are respectively added to the input end of the three-terminal voltage regulator U2 through the diode D1 and the diode D2, and its output end will output +12V. This +12V is output to supply the power input module 9, the power output module 10, and the fan drive module 12; the other path is added to the input end of the low-dropout linear voltage regulator U3, and its output end will output +5V. This +5V is used as the power supply for the main control module 8 and the temperature measurement module 11.

[0048] Please continue to refer to Figure 7, the power output module 10 includes three high-power field effect transistors Q5, Q6, and Q7 of the same specification model. Due to the power limitation of the field effect transistors, the high-power field effect transistors Q5, Q6, and Q7 are used in parallel. The 0 to +5V PWM signal sent from the 9th pin P33 of the microcontroller U1 is added to the input of the chip U4 through the current limiting of the resistor R12. The output of the chip U4 will output a 0 to +12V PWM signal, which is added to the gates of the high-power field effect transistors Q5, Q6, and Q7 through the voltage division and current limiting of the resistors R13 and R14. The drains of the high-power field effect transistors Q5, Q6, and Q7 are connected to the negative pole of the microcrystalline heating plate 2.

[0049] Since the positive pole of the microcrystalline heating plate 2 is connected to the output of the power input module 9, the negative pole of the microcrystalline heating plate 2 is connected to the drains of the high-power field effect transistors Q5, Q6, and Q7, and the sources of the high-power field effect transistors Q5, Q6, and Q7 are connected to the ground. If there is voltage at the gates of the high-power field effect transistors Q5, Q6, and Q7, the high-power field effect transistors Q5, Q6, and Q7 will conduct, and there will be current flowing through the microcrystalline heating plate 2 to the ground, and the microcrystalline heating plate 2 will heat up. If there is no voltage at the gates of the high-power field effect transistors Q5, Q6, and Q7, the high-power field effect transistors Q5, Q6, and Q7 will cut off and not conduct, and there will be no current flowing through the microcrystalline heating plate 2 to the ground, and the microcrystalline heating plate 2 will not heat up.

[0050] The power input module 9 includes a DC relay; the power output module 10 includes three high-power field effect transistors; the DC relay of the power input module 9 and the three high-power field effect transistors of the power output module 10 form a series circuit and are connected to the power supply circuit of the microcrystalline heating plate 2. Since the current is very high when the microcrystalline heating plate 2 is working, the large current may cause the contacts of the DC relay to stick or the high-power field effect transistors to short-circuit due to overcurrent. Such a series circuit can prevent any one of the components from having contact sticking or short-circuit failure, resulting in overcurrent and burning out the microcrystalline heating plate 2 or other components.

[0051] Please continue to refer to Figure 7 , the power input module 9 has two inputs, and the functions and circuits of the two are exactly the same. The DC relay RL1 outputs the DC voltage and current input from the aviation socket 3 to the positive pole of the microcrystalline heating plate 2 through the closing of the contacts. The working principle of the DC relay RL2 is similar.

[0052] The main control module 8 includes a microcontroller U1, and the model of the microcontroller U1 is CA51F252L2; the microcontroller U1 is used to output a PWM signal to drive the conduction and closing of the three high-power field effect transistors of the power output module 10 to control the power on and off of the microcrystalline heating plate 2.

[0053] Please continue to refer to Figure 6, the P00 port of the 45th pin of the microcontroller U1 is the switch button input port of the display keypad 41 and is set as an input port with an internal pull-up resistor.

[0054] The power switch 42 uses a single-pole double-throw switch SW2 and is input to the P50 port of the 18th pin of the microcontroller U1. The P50 port is set as an input port with an internal pull-up resistor.

[0055] The P41 port of the 15th pin and the P42 port of the 14th pin of the microcontroller U1 are set as AD input ports for measuring the temperature values of the first temperature sensor RT1 and the first temperature sensor RT2. According to the change of the temperature values of the first temperature sensor RT1 and the first temperature sensor RT2, the duty cycle of the PWM signal output by the P33 port of the 9th pin of the microcontroller U1 is used to adjust the heating power of the microcrystalline heating plate 2.

[0056] The P40 port of the 16th pin of the microcontroller U1 is set as an AD input port for detecting the magnitude of the input DC voltage. If the input DC voltage is higher than the maximum limit value, the microcontroller U1 controls the microcrystalline heating plate 2 to stop heating to prevent the microcrystalline heating plate 2 from being burned out due to excessive heating power caused by too high input DC voltage.

[0057] The P43 port of the 13th pin of the microcontroller U1 is set as an AD input port for detecting the temperature of the second temperature sensor RT3 directly welded on the main control board, and this temperature represents the temperature of the main control board. When the temperature of the main control board is higher than the set value, the microcontroller U1 can control the microcrystalline heating plate 2 to stop heating or reduce the power of the microcrystalline heating plate 2. When the temperature of the main control board drops to the normal value, the heating control of the microcrystalline heating plate 2 is restored, so as to ensure that the working environment temperature of the main control board does not exceed the maximum value.

[0058] The P62 port of the 23rd pin of the microcontroller U1 is set as an output port to control the opening and closing of the fan drive module 12, and thus can control the start and stop of the cooling fan 17.

[0059] The temperature sensor assembly 6 includes two first temperature sensors 61, two high-temperature resistant silicone caps 62, and a second temperature sensor welded on the main control board; a positioning groove adapted to the first temperature sensor 61 is provided at the top of the high-temperature resistant silicone cap 62; at least two mounting posts 63 are further provided in the electric furnace housing 1, and a mounting groove adapted to the high-temperature resistant silicone cap 62 is provided at the top of the mounting post 63; the high-temperature resistant silicone cap 62 is embedded and installed in the mounting groove, and the first temperature sensor 61 is embedded and installed in the positioning groove and its detection head is in contact with the back surface of the microcrystalline heating plate 2.

[0060] The first temperature sensor 61 is an axially glass-sealed NTC thermistor; two first temperature sensors 61 are provided for measuring the temperature of the microcrystalline heating plate 2. The detection head of the first temperature sensor 61 protrudes 1 mm from the top plane of the high-temperature resistant silica gel cap 62, facilitating good contact between the detection head of the first temperature sensor 61 and the temperature measurement point on the back of the microcrystalline heating plate 2. In a specific embodiment, please continue to refer to Figure 3 , three mounting posts 63 are provided, one of the mounting posts 63 is located at the middle position corresponding to the heating area of the microcrystalline heating plate 2, and the other two mounting posts 63 are both 40 - 55 mm away from this middle position, and the connection lines of the three mounting posts 63 form a triangle.

[0061] The first temperature sensor RT1 is mounted on the middle position corresponding to the heating area of the microcrystalline heating plate 2 through the high-temperature resistant silica gel cap 62, and the first temperature sensor RT2 is mounted on any one of the other two mounting posts 63 through the high-temperature resistant silica gel cap 62. The first temperature sensor RT1 is used to measure the temperature of the microcrystalline heating plate 2, and the main control module 8 controls the power of the microcrystalline heating plate 2 and controls the opening and closing of the microcrystalline heating plate 2 according to this measurement result, ensuring that the temperature of the microcrystalline heating plate 2 is controlled within the set range. The first temperature sensor RT2 is used to measure the temperature of the microcrystalline heating plate 2 to prevent the microcrystalline heating plate 2 from being burned out due to excessive temperature. The second temperature sensor RT3 is directly welded to the main control board and is used to measure the temperature of the main control board to avoid the main control board being burned out due to excessive temperature.

[0062] An inorganic conductive resistance film layer is provided on the back of the microcrystalline heating plate 2, and this inorganic conductive resistance film layer is the heating area. Please continue to refer to Figure 9 , a claw-shaped positive silver paste conductive strip 13 and a negative silver paste conductive strip 14 are printed on the inorganic conductive resistance film layer, and the number and shape of the silver paste conductive strips determine the maximum power of the microcrystalline heating plate 2. The positive silver paste conductive strip 13 and the negative silver paste conductive strip 14 are distributed in a finger-crossed pattern. When a DC voltage is applied to the silver paste conductive strips, the inorganic conductive resistance film layer will be energized to generate heat and emit infrared heat, forming a heat radiation source. Most of the heat is propagated outward in the form of heat radiation, and at the same time, the remaining part of the heat is propagated through conduction and convection.

[0063] The display button module 4 includes a display button board 41 provided on the front side of the microcrystalline heating plate 2, and a power switching switch 42 provided at the bottom of the electric furnace housing 1; a switch button and several LED indicator lights are provided on the display button board 41. Please continue to refer to Figures 1-2 , the switch button is the ON / OFF button. The power switching switch 42 at the bottom of the electric furnace housing 1 is used to switch between the high-power mode and the low-power mode. The LED indicator lights can display the temperature grade and display the high-power mode or the low-power mode. Please continue to refer to Figure 6, the power switching switch 42 uses a single-pole double-throw switch SW2.

[0064] Please continue to refer to Figure 6 , the high and low levels output from the P62 port of pin 23 of the microcontroller U1 control the operation and stop of the cooling fan 17. If the P62 port of pin 23 of the microcontroller U1 outputs a high level, this high level passes through the voltage division and current limiting of the resistor R17 and the resistor R18 and is applied to the gate of the field effect transistor Q8. The gate of the field effect transistor Q8 has a voltage, and the field effect transistor Q8 conducts. Since the positive pole of the cooling fan 17 is connected to +12V, the negative pole of the cooling fan 17 is connected to the drain of the field effect transistor Q8, and the source of the field effect transistor Q8 is grounded. Since the gate of the field effect transistor Q8 has a voltage, the field effect transistor Q8 conducts, and the cooling fan 17 rotates.

[0065] When the electric cooker is working, the microcrystalline heating plate 2 not only radiates, conducts, and convects heat to the stove surface, but also radiates, conducts, and convects heat to the inside of the stove. Although the heat radiated to the inside of the stove is less than the heat radiated to the outside of the stove, it will also cause a large amount of heat to accumulate inside the stove. Whether it is the plastic structural parts of the stove or the electronic components on the main control board, they cannot withstand such high temperatures. Therefore, it is necessary to insulate the microcrystalline heating plate 2 inside the stove. Please continue to refer to Figure 3 , starting from the back of the microcrystalline heating plate 2, the first layer is a mica sheet 51 with a thickness of 1mm, the second layer is an environmentally friendly heat insulation cotton 52 with a thickness of 15mm, and the third layer is an aluminum plate 53 with a thickness of 1mm. This effectively blocks the radiation, conduction, and convection of heat, thereby greatly reducing the temperature inside the stove.

[0066] Secondly, one side of the bottom of the electric stove housing 1 is provided with an air inlet hole 15, and the other side is provided with an air outlet hole 16. The cooling fan 17 is installed to exhaust heat from the inside of the stove. When the cooling fan 17 rotates, the hot air inside the electric stove housing 1 is discharged from the air outlet hole 16 by the cooling fan 17, and the outside cold air will be supplemented into the electric stove housing 1 from the air inlet hole 15, forming an air circulation, so that the temperature inside the stove meets the normal working requirements.

[0067] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and replacements can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A low-voltage DC electric cooker, characterized in that, It includes an electric furnace housing with an opening at the top, a microcrystalline heating plate embedded in the opening at the top of the electric furnace housing, an aviation socket and a display key module installed on the electric furnace housing, and a main control board, a heat insulation component, a cooling fan, and a temperature sensor component built in the electric furnace housing; the main control board is electrically connected to the microcrystalline heating plate, the aviation socket, the display key module, the cooling fan, and the temperature sensor component respectively; the heat insulation component includes a mica sheet, a heat insulation cotton, and an aluminum plate stacked in sequence on the back of the microcrystalline heating plate; the aviation socket is used to input low-voltage direct current.

2. The low-voltage DC electric cooker according to claim 1, wherein A power supply module, a main control module, a power input module, a power output module, a temperature measurement module, and a fan drive module are provided on the main control board; the low-voltage direct current input by the aviation socket is output to the power input module, the power output module, and the fan drive module after passing through the power supply module, and is output to the main control module and the temperature measurement module on the other path; the temperature measurement module is connected to the temperature sensor component, and the fan drive module is connected to the cooling fan.

3. The low-voltage DC electric cooker according to claim 2, characterized in that, The power input module includes a DC relay; the power output module includes three high-power field effect transistors; the DC relay of the power input module and the three high-power field effect transistors of the power output module form a series circuit and are connected to the power supply circuit of the microcrystalline heating plate.

4. The low-voltage DC electric cooker according to claim 3, characterized in that, The main control module includes a microcontroller U1, and the model of the microcontroller U1 is CA51F252L2; the microcontroller U1 is used to output a PWM signal to drive the conduction and cut-off of the three high-power field effect transistors of the power output module to control the power-on and power-off of the microcrystalline heating plate.

5. The low-voltage DC electric cooker according to claim 2, wherein, The temperature sensor component includes two first temperature sensors and two high-temperature resistant silicone caps; a positioning groove adapted to the first temperature sensor is provided at the top of the high-temperature resistant silicone cap; at least two mounting posts are further provided in the electric furnace housing, and a mounting groove adapted to the high-temperature resistant silicone cap is provided at the top of the mounting post; the high-temperature resistant silicone cap is embedded and installed in the mounting groove, and the first temperature sensor is embedded and installed in the positioning groove and its detection head is in contact with the back of the microcrystalline heating plate.

6. The low-voltage DC electric cooker according to claim 5, characterized in that The first temperature sensor is an axial glass-sealed NTC thermistor; two first temperature sensors are provided to measure the temperature of the microcrystalline heating plate.

7. The low-voltage DC electric cooker according to claim 5, wherein The temperature sensor component further includes a second temperature sensor welded on the main control board to measure the temperature of the main control board.

8. The low-voltage DC electric cooker according to claim 1, characterized in that, An inorganic conductive resistance film layer is provided on the back of the microcrystalline heating plate; a positive silver paste conductive strip and a negative silver paste conductive strip are printed on the inorganic conductive resistance film layer; the positive silver paste conductive strip and the negative silver paste conductive strip are distributed in a finger-crossed pattern.

9. The low-voltage DC electric cooker according to claim 1, wherein The display key module includes a display key board provided on the front side of the microcrystalline heating plate and a power switching switch provided at the bottom of the electric furnace housing; a switch key and several LED indicator lights are provided on the display key board.

10. The low-voltage DC electric cooker according to claim 1, characterized in that, An air inlet hole is provided on one side of the bottom of the electric furnace housing, and an air outlet hole is provided on the other side.

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