Steam box heating disc assembly and steam box

Abstract

The utility model relates to the technical field of steam boxes, in particular to a steam box heating plate assembly and a steam box, the steam box heating plate assembly comprises a plate body, the inner side wall of the plate body is provided with a mounting groove; the resistance detection loop comprises a resistance measurement assembly arranged in the mounting groove and a detection circuit capable of outputting the resistance value of the resistance measurement assembly; the resistance measurement assembly comprises a first conductive end and a second conductive end which are oppositely arranged, the first conductive end is arranged close to the bottom of the disc body, and the second conductive end is arranged close to the opening of the disc body and connected with the detection circuit in series; any position of the resistance measuring assembly can conduct electricity, and the detection circuit can determine resistance values of the resistance measuring assembly under different liquid levels. According to the utility model, through different liquid levels immersed on the resistance measurement assembly, the liquid level in the plate body is judged according to the resistance value of the resistance measurement assembly obtained by the detection circuit, the liquid level in the plate body is accurately controlled, the steam box heating plate assembly is prevented from cracking due to dry burning, and the service life of the steam box heating plate assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of steamers, and particularly relates to a steam box heating plate assembly and a steam box. Background Art

[0002] A heating plate and a water tank are arranged inside the steamer cavity. When the steamer works, water in the water tank is introduced to the heating plate, and the heating plate heats and vaporizes the water to cook food.

[0003] When the water in the water tank is insufficient, the heating plate is prone to dry burning due to water shortage. To solve the problem of water shortage in the heating plate, a temperature sensor detection device is arranged at the bottom of the heating plate in the prior art, and the controller controls the water tank valve to add water to the heating plate by detecting the temperature change of the bottom temperature sensor; however, currently, for a ceramic film heating plate, whether there is water shortage is detected by the temperature change of the bottom temperature sensor. When the ceramic film coating is not used for a long time, there will be precipitation inside, which affects heat transfer, and long-term scale precipitation during use will also affect heat transfer, thereby affecting the detection accuracy of the temperature sensor, resulting in dry burning of the heating plate, affecting the cooking effect, and seriously causing the heating plate to crack.

[0004] Based on the disadvantages of the prior art, it is urgent to research a steam box heating plate assembly and a steam box to solve the above problems. Content of the Utility Model

[0005] To solve the above technical problems, by submerging at different liquid levels on the resistance measurement component, the resistance value of the resistance measurement component connected to the detection circuit changes, and then the liquid level in the plate body is judged by the resistance value of the resistance measurement component obtained by the detection circuit, the liquid level in the plate body is accurately controlled, the steam generation speed is increased, the dry burning and cracking of the steam box heating plate assembly are prevented, the service life of the steam box heating plate assembly is prolonged, and potential safety hazards are avoided.

[0006] The utility model provides a steam box heating plate assembly, including:

[0007] A plate body capable of containing liquid, and an installation groove is arranged on the inner side wall of the plate body;

[0008] A resistance detection circuit, including a resistance measurement component arranged in the installation groove and a detection circuit capable of outputting the resistance value of the resistance measurement component;

[0009] The resistance measurement component includes a first conductive end and a second conductive end arranged oppositely. The first conductive end is arranged close to the bottom of the plate body, the second conductive end is arranged close to the opening of the plate body, and the second conductive end is connected in series with the detection circuit; any position of the resistance measurement component can conduct electricity, and the detection circuit can determine the resistance value of the resistance measurement component at different liquid levels.

[0010] Further, the resistance measurement component includes a detection resistor, a first conductive sheet, and a second conductive sheet;

[0011] The first conductive sheet is located at the first conductive end. The first conductive sheet is fixed between the first end of the detection resistor and the installation groove, and the first conductive sheet is in the same horizontal plane as the bottom of the disk body;

[0012] The second conductive sheet is located at the second conductive end. The second conductive sheet is fixed between the second end of the detection resistor and the installation groove.

[0013] Further, the resistance detection circuit further includes a power supply, and the power supply is electrically connected to the first conductive sheet.

[0014] Further, the voltage value of the power supply is 5V - 10V.

[0015] Further, along the circumferential direction of the disk body, the length of the detection resistor is 2% - 15% of the circumference of the disk body.

[0016] Further, along the direction from the bottom of the disk body to the opening of the disk body, the height of the resistance measurement component is equal to the height of the disk body.

[0017] Further, the shape of the detection resistor is adapted to the shape of the installation groove, and the bending radian of the detection resistor is the same as the bending radian of the side wall of the disk body;

[0018] The detection resistor is placed in the installation groove, and the side wall of the detection resistor and the side wall of the disk body form the circular inner side wall of the disk body.

[0019] Further, the resistance measurement components are arranged in one-to-one correspondence with the detection circuits;

[0020] The detection circuit has an input end and an output end. The resistance measurement component is connected in series at the input end. The resistance value between the resistance measurement components can change with the change of the liquid level in the disk body, and the output end can output a corresponding resistance value according to the change of the resistance value.

[0021] Further, the detection circuit further includes a first resistor and at least one group of voltage division branches;

[0022] The first resistor is connected in series between the resistance measurement component and the output end;

[0023] The at least one group of voltage division branches is connected in parallel with the first resistor;

[0024] When the liquid level in the disk body changes, the output end can output different resistance values.

[0025] The present utility model also protects a steam box, which includes a box body, a water tank arranged on the box body, and the steam box heating plate assembly as described above. The liquid in the water tank can flow to the steam box heating plate.

[0026] Implementing the embodiments of the present utility model has the following beneficial effects:

[0027] The resistance measurement component in the present utility model is provided with a first conductive end and a second conductive end. The first conductive end is arranged near the bottom of the disc body, and the first conductive end can be immersed in water for conduction; by submerging at different liquid levels on the resistance measurement component, the resistance value of the resistance measurement component connected to the detection circuit changes. Furthermore, the liquid level in the disc body is judged based on the resistance value of the resistance measurement component obtained by the detection circuit, avoiding the hysteresis of the existing use of temperature sensors for detection, precisely controlling the liquid level in the disc body, improving the steam generation speed, preventing the steam box heating plate assembly from dry burning and cracking, prolonging the service life of the steam box heating plate assembly and avoiding potential safety hazards. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions of the present utility model, the accompanying drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a structural diagram of the disc body from the first angle of this embodiment;

[0030] Figure 2 It is a structural diagram of the disc body from the second angle of this embodiment;

[0031] Figure 3 It is a cross-sectional view of the disc body of this embodiment;

[0032] Figure 4 It is a structural diagram of the installation groove of this embodiment;

[0033] Figure 5 It is a structural diagram of the detection resistor of this embodiment;

[0034] Figure 6 It is a circuit diagram of the detection circuit of this embodiment;

[0035] Figure 7 It is a structural diagram of the detection resistor equivalent to a cylinder with an isosceles right triangle cross-section of this embodiment.

[0036] Among them, the corresponding reference numerals in the drawings are:

[0037] 1 - Disk body; 2 - Resistance measurement component; 3 - Detection circuit; 11 - Installation groove; 21 - Detection resistor; 22 - First conductive sheet; 23 - Second conductive sheet; 31 - First resistor; 32 - Second resistor; 33 - Capacitor; 34 - Output terminal. Detailed implementation manners

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0040] Aiming at the defects of the prior art, the resistance measurement component in the present invention is provided with a first conductive end and a second conductive end. The first conductive end is arranged near the bottom of the disk body and can be immersed in water for conduction. By submerging at different liquid levels on the resistance measurement component, the resistance value of the resistance measurement component connected to the detection circuit changes. Furthermore, the liquid level in the disk body is judged by the resistance value of the resistance measurement component obtained by the detection circuit, avoiding the hysteresis of the existing use of temperature sensors, accurately controlling the liquid level in the disk body, improving the steam generation speed, preventing the dry burning and cracking of the steaming box heating disk component, prolonging the service life of the steaming box heating disk component and avoiding potential safety hazards.

[0041] See the attached Figures 1 to 7 As shown in the figure, this embodiment provides a steaming box heating disk component, including: a disk body 1 capable of containing liquid, and an installation groove 11 is arranged on the inner side wall of the disk body 1; a resistance detection circuit, including a resistance measurement component 2 arranged in the installation groove 11 and a detection circuit 3 capable of outputting the resistance value of the resistance measurement component 2; the resistance measurement component 2 includes a first conductive end and a second conductive end arranged opposite to each other. The first conductive end is arranged near the bottom of the disk body 1, and the second conductive end is arranged near the opening of the disk body 1. The second conductive end is connected in series with the detection circuit 3; any position of the resistance measurement component 2 can conduct electricity, and the detection circuit 3 can determine the resistance value of the resistance measurement component 2 at different liquid levels.

[0042] It should be noted that: in this embodiment, the resistance measurement component 2 is provided with a first conductive end and a second conductive end. The first conductive end is arranged near the bottom of the disk body 1, and the first conductive end can be immersed in water for conduction. By submerging at different liquid levels on the resistance measurement component 2, the resistance value of the resistance measurement component 2 connected to the detection circuit 3 changes. Furthermore, the liquid level inside the disk body 1 is judged by the resistance value of the resistance measurement component 2 obtained by the detection circuit 3, avoiding the hysteresis of the existing temperature sensor detection, accurately controlling the liquid level inside the disk body 1, increasing the steam generation speed, preventing the dry burning and cracking of the steaming box heating disk assembly, prolonging the service life of the steaming box heating disk assembly and avoiding potential safety hazards.

[0043] In this embodiment, the resistance measurement component 2 is fixed in the installation groove 11. In this embodiment, the height of the disk body 1 is defined as the height from the inner bottom of the disk body 1 to the opening of the disk body 1.

[0044] Specifically, the installation groove 11 is a groove provided on the inner side wall of the disk body 1, and the opening of the installation groove 11 faces the axis of the disk body 1. One side of the installation groove 11 is flush with the bottom of the disk body 1, and the other side of the installation groove 11 faces the opening direction of the disk body 1.

[0045] In some possible embodiments, the resistance measurement component 2 is adhesively fixed in the installation groove 11.

[0046] In some other possible embodiments, the resistance measurement component 2 is snap - fixed in the installation groove 11.

[0047] Specifically, one of the resistance measurement component 2 and the installation groove 11 is provided with a snap - groove, and the other is provided with a snap - projection that cooperates with it, and the resistance measurement component 2 and the installation groove 11 are snap - fixed.

[0048] In some possible embodiments, the resistance measurement component 2 includes a detection resistor 21, a first conductive sheet 22, and a second conductive sheet 23. The first conductive sheet 22 is located at the first conductive end. The first conductive sheet 22 is fixed between the first end of the detection resistor 21 and the installation groove 11, and the first conductive sheet 22 is in the same horizontal plane as the bottom of the disk body 1. The second conductive sheet 23 is located at the second conductive end. The second conductive sheet 23 is fixed between the second end of the detection resistor 21 and the installation groove 11. By providing the first conductive sheet 22 and the second conductive sheet 23, it is convenient to connect to the power supply and the detection circuit 3, improving the connection stability of the overall structure.

[0049] Specifically, the sizes of the first conductive sheet 22 and the second conductive sheet 23 are not limited as long as they can be connected to the power supply and the detection circuit 3.

[0050] Preferably, the length of the first conductive sheet 22 is less than 5% of the length of the detection resistor 21, and the length of the second conductive sheet 23 is less than 5% of the length of the detection resistor 21.

[0051] Preferably, the first conductive sheet 22 is disposed in the middle of the first conductive end, and the second conductive sheet 23 is disposed in the middle of the second conductive end.

[0052] Specifically, the sizes of the first conductive sheet 22 and the second conductive sheet 23 are much smaller than the length of the detection resistor 21.

[0053] In some possible embodiments, the resistance detection circuit further includes a power source. The power source is electrically connected to the first conductive sheet 22. By connecting the first conductive sheet 22 to the power source, a voltage difference can be achieved between the first conductive sheet 22 and the second conductive sheet 23. Current can flow from the first conductive sheet 22 through the liquid and part of the detection resistor 21 to the second conductive sheet 23, or current can flow from the first conductive sheet 22 through the detection resistor 21 to the second conductive sheet, realizing the flow of current between the first conductive sheet 22 and the second conductive sheet 23. Furthermore, it ensures that the detection circuit 3 can obtain the resistance values at different liquid levels, thereby judging the liquid level in the disk body 1, avoiding the hysteresis of the existing temperature sensor detection, realizing precise control of the liquid level in the disk body 1, preventing the dry burning and cracking of the steaming box heating disk assembly, prolonging the service life of the steaming box heating disk assembly and avoiding potential safety hazards.

[0054] Specifically, one end of the first conductive sheet 22 extends out the lead wire to be connected to the power source disposed outside the disk body 1, and one end of the second conductive sheet 23 extends out the lead wire to be connected to the detection circuit 3 disposed outside the disk body 1.

[0055] In some possible embodiments, the voltage value of the power source is 5V - 10V. By setting the voltage value of the power source within the above range, it can ensure that a pressure difference is formed between the first conductive sheet 22 and the second conductive sheet 23, thereby ensuring that current can flow from the first conductive sheet 22 to the second conductive sheet 23. At the same time, it can supply power to the detection circuit 3, and by reducing the low voltage, it can avoid the danger caused by too high voltage value, that is, ensure the use safety.

[0056] Specifically, the power value of the power source is 5V - 6V, 5V - 8V, 8V - 10V or 5V - 10V, etc.

[0057] Preferably, the voltage value of the power source is 5V.

[0058] In some possible embodiments, along the circumferential direction of the disk body 1, the length of the detection resistor 21 is 2% - 15% of the circumference of the disk body 1. By setting the length of the detection resistor 21 within the above range, the detection of the liquid level in the disk body 1 can be realized, reducing the use cost and manufacturing cost.

[0059] Specifically, the length of the detection resistor 21 is 2% - 5%, 2% - 8%, 2% - 10%, 2% - 15%, 5% - 8%, 5% - 10%, 5% - 15% or 10% - 15% of the circumference of the disk body 1, etc.

[0060] In some possible embodiments, along the direction from the bottom of the disk body 1 to the opening of the disk body 1, the height of the resistance measurement component 2 is equal to the height of the disk body 1. By making the height of the resistance measurement component 2 equal to the height of the disk body 1, it can be ensured that the resistance measurement component 2 can detect the liquid levels at various positions in the disk body 1, improving the detection range of the resistance measurement component 2, expanding the application range of the resistance measurement component 2, and thus enhancing the user experience.

[0061] Specifically, along the direction from the bottom of the disk body 1 to the opening of the disk body 1, the height of the installation groove 11 is equal to the height of the resistance measurement component 2.

[0062] Specifically, the bottom of the installation groove 11 is sealed to prevent the liquid in the disk body 1 from flowing out through the installation groove 11 and to avoid electric leakage, improving the use safety.

[0063] In some other possible embodiments, along the direction from the bottom of the disk body 1 to the opening of the disk body 1, the height of the resistance measurement component 2 is less than the height of the disk body 1.

[0064] Specifically, the height of the resistance measurement component 2 is set according to the actual situation.

[0065] Preferably, the height of the resistance measurement component 2 is 50%-100% of the height of the disk body 1.

[0066] Specifically, the height of the resistance measurement component 2 is 50%-60%, 50%-75%, 50%-80%, 50%-100%, 60%-75%, 60%-85%, 60%-100% or 75%-100% of the height of the disk body 1.

[0067] Preferably, the height of the resistance measurement component 2 is 75% of the height of the disk body 1.

[0068] Specifically, when it is detected that the liquid level is at 75% of the height of the disk body 1, that is, when the liquid level completely covers the resistance measurement component 2, there is no need to add water to the disk body 1, and at this time, the disk body 1 is in a normal working state; when it is detected that the liquid level is at 25% of the height of the disk body 1, that is, when the liquid level partially covers the resistance measurement component 2, water needs to be added to the disk body 1, and the water needs to be added until the liquid level reaches 75% of the height of the disk body 1.

[0069] In some possible embodiments, the shape of the detection resistor 21 is adapted to the shape of the mounting groove 11, and the bending arc of the detection resistor 21 is the same as the bending arc of the side wall of the disk body 1; the detection resistor 21 is placed in the mounting groove 11, and the side wall of the detection resistor 21 and the side wall of the disk body 1 form the circular inner side wall of the disk body 1. By adapting the shape of the detection resistor 21 to the shape of the mounting groove 11, the overall aesthetics of the steaming box heating plate assembly can be ensured after the detection resistor 21 is installed in the mounting groove 11, and it can be avoided that due to the mismatch between the detection resistor 21 and the mounting groove 11, liquid remains between the detection resistor 21 and the mounting groove 11 for a long time, resulting in bacteria and causing pollution to the steaming box.

[0070] Specifically, the shape and size of the detection resistor 21 are not limited, as long as it is ensured that the detection resistor 21 can be connected to the mounting groove 11 and can detect the liquid level in the disk body 1.

[0071] In some possible embodiments, the resistance measurement components 2 and the detection circuits 3 are arranged in one-to-one correspondence; the detection circuit 3 has an input end and an output end 34, the resistance measurement components 2 are connected in series at the input end, the resistance value between the resistance measurement components 2 can change with the change of the liquid level in the disk body 1, and the output end 34 can output the corresponding resistance value according to the change of the resistance value. By arranging the resistance measurement components 2 and the detection circuits 3 in one-to-one correspondence, the detection circuit 3 can accurately obtain the relevant data of the resistance measurement components 2 with the least number of components set, reducing the setting cost.

[0072] Specifically, the second conductive end 23 of the resistance measurement component 2 is connected in series with the input end.

[0073] In this embodiment, the steaming box heating plate assembly includes a group of resistance detection circuits, the number of the resistance measurement components 2 and the detection circuits 3 is one, and the two are connected in series.

[0074] In some other possible embodiments, the steaming box heating plate assembly includes two groups of resistance detection circuits, and the two groups of resistance detection circuits are independent of each other and do not interfere with each other. Through the redundant setting of the resistance detection circuits, the detection circuit can be detected more safely, further ensuring the accuracy of the detection result.

[0075] In some possible embodiments, the detection circuit 3 further includes a first resistor 31 and at least one group of voltage-dividing branches; the first resistor 31 is connected in series between the resistance measurement component 2 and the output end 34; at least one group of voltage-dividing branches is connected in parallel with the first resistor 31; when the liquid level in the disk body 1 changes, the output end 34 can output different resistance values; by setting the first resistor 31 and the voltage-dividing branches, the detection circuit can be voltage-divided, avoiding the influence of excessive voltage of the detection circuit on the detection result and ensuring the accuracy of the detection result.

[0076] In this embodiment, the detection circuit 3 includes a voltage-dividing branch, and the voltage-dividing branch is connected in parallel with the first resistor 31 to achieve the voltage-dividing function of the detection circuit.

[0077] In some other possible embodiments, the redundant setting of the detection circuit 3 including two groups of voltage-dividing branches connected in parallel can divide the voltage of the detection circuit more safely, further ensuring the accuracy of the detection result.

[0078] In some possible embodiments, the voltage-dividing circuit further includes a second resistor 32 and a capacitor 33. The capacitor 33 is connected in series with the second resistor 32, and the capacitor 33 is grounded between the capacitor 33 and the second resistor 32. By setting the capacitor 33, the interference of unnecessary signals can be filtered out to ensure the accuracy of the detection result. By setting the grounding, the safety of the detection circuit can be ensured, and the probability of potential safety hazards can be reduced.

[0079] Specifically, as long as the voltage division can be achieved, the resistance values of the first resistor 31 and the second resistor 32 are set according to the actual situation and are not limited herein.

[0080] In some possible embodiments, a heater is provided on the outer side of the bottom of the disk body 1. The heater is annular, and the liquid inside the disk body 1 is heated by setting the heater.

[0081] In this embodiment, the resistance value is equal to conductivity * length / area. The shape of the detection resistor 21 is equivalent to a column with an isosceles right triangle cross-section. The two right sides of the isosceles right triangle are defined as L1, and the hypotenuse of the isosceles right triangle, that is, the length of the column, is L2.

[0082] In this embodiment, the resistance value of the detection resistor 21 is set according to the actual situation and is not limited herein.

[0083] Preferably, the resistance value of the detection resistor 21 is 1 MΩ.

[0084] In this embodiment, taking the resistance value of the detection resistor 21 being 1 MΩ as an example for illustration, the following operations are also applicable when the resistance value of the detection resistor 21 is other values:

[0085] The liquid level height in the disk body 1 is inversely proportional to the resistance value of the detection resistor 21, that is, L1 * L1 * L2 * ρ / 2 = 1 MΩ;

[0086] When the measured detection resistor 21 reaches 1 MΩ, the lowest liquid level is 0. When the detection resistor 21 is equal to 0, the liquid level ≥ L1.

[0087] When it is detected that the liquid level in the disk body 1 is lower than 1 / 4 * L1, the steaming box heating disk assembly is replenished with water until the water level reaches 3 / 4 * L1 and then the water replenishment stops. Controlling the liquid level within this range can achieve the best steam generation effect and prevent dry burning from damaging the steaming box heating disk assembly.

[0088] When there is no liquid in the pan body 1, the liquid level detection process in the steaming box heating plate assembly: When there is no liquid in the pan body 1, the current sequentially flows from the power supply, the first conductive end 22, the detection resistor 21, the second conductive sheet 23 and the detection circuit 3, and flows out from the output end 34 of the detection circuit 3. By obtaining the voltage value of the output end 34, the resistance value connected between the first conductive sheet 22 and the second conductive sheet 23 can be determined, that is, the resistance value is 1 MΩ, and then the liquid level height in the pan body 1 is determined to be zero.

[0089] When there is liquid in the pan body 1, the liquid level detection process in the steaming box heating plate assembly: When there is liquid in the pan body 1, the current sequentially flows from the power supply, the first conductive end 22, the liquid in the pan body 1, the part of the detection resistor 21 located on the liquid surface, the second conductive sheet 23 and the detection circuit 3, and flows out from the output end 34 of the detection circuit 3. By obtaining the voltage value of the output end 34, the resistance value connected between the first conductive sheet 22 and the second conductive sheet 23 can be determined. At this time, the resistance value is less than 1 MΩ, and then the liquid level height in the pan body 1 is determined to be non-zero. The specific liquid level height in the corresponding pan body 1 is calculated according to the obtained resistance value.

[0090] The present utility model also protects a steaming box, which includes a box body, a water tank arranged on the box body, and the above-mentioned steaming box heating plate assembly. The liquid in the water tank can flow to the steaming box heating plate.

[0091] It should be noted that: in this embodiment, by submerging at different liquid levels on the resistance measurement component 2, the resistance value of the resistance measurement component 2 connected to the detection circuit 3 changes, and then the liquid level in the pan body 1 is judged by the resistance value of the resistance measurement component 2 obtained by the detection circuit 3, avoiding the hysteresis of the existing detection using a temperature sensor, accurately controlling the liquid level in the pan body 1, increasing the steam generation speed, preventing the steaming box heating plate assembly from dry burning and cracking, prolonging the service life of the steaming box heating plate assembly and avoiding safety hazards.

[0092] Specifically, a water inlet is further arranged on the pan body 1, the water inlet is communicated with the water tank, and the installation groove 11 is arranged away from the water inlet.

[0093] Embodiment 1

[0094] See the appendix Figures 1 to 7, this embodiment provides a steam box heating plate assembly, including: a plate body 1 capable of accommodating liquid, and an installation groove 11 is provided on the inner side wall of the plate body 1; a resistance detection circuit, including a resistance measurement component 2 disposed in the installation groove 11 and a detection circuit capable of outputting the resistance value of the resistance measurement component 2; the resistance measurement component 2 includes a first conductive end and a second conductive end disposed opposite to each other, the first conductive end is disposed near the bottom of the plate body 1, the second conductive end is disposed near the opening of the plate body 1, and the second conductive end is connected in series with the detection circuit 3; any position of the resistance measurement component 2 can conduct electricity, and the detection circuit 3 can determine the resistance value of the resistance measurement component 2 at different liquid levels.

[0095] In this embodiment, the resistance measurement component 2 includes a detection resistor 21, a first conductive sheet 22 and a second conductive sheet 23; the first conductive sheet 22 is located at the first conductive end, the first conductive sheet 22 is fixed between the first end of the detection resistor 21 and the installation groove 11, and the first conductive sheet 22 is in the same horizontal plane as the bottom of the plate body 1; the second conductive sheet 23 is located at the second conductive end, and the second conductive sheet 23 is fixed between the second end of the detection resistor 21 and the installation groove 11.

[0096] Preferably, the first conductive sheet 22 is disposed in the middle of the first conductive end, and the second conductive sheet 23 is disposed in the middle of the second conductive end.

[0097] Specifically, the sizes of the first conductive sheet 22 and the second conductive sheet 23 are much smaller than the length of the detection resistor 21.

[0098] In this embodiment, along the circumferential direction of the plate body 1, the length of the detection resistor 21 is 2% - 15% of the circumference of the plate body 1.

[0099] Specifically, the length of the detection resistor 21 is 2% - 5%, 2% - 8%, 2% - 10%, 2% - 15%, 5% - 8%, 5% - 10%, 5% - 15% or 10% - 15% etc. of the circumference of the plate body 1.

[0100] In this embodiment, along the direction from the bottom of the plate body 1 to the opening of the plate body 1, the height of the resistance measurement component 2 is equal to the height of the plate body 1.

[0101] In some other possible embodiments, along the direction from the bottom of the plate body 1 to the opening of the plate body 1, the height of the installation groove 11 is equal to the height of the resistance measurement component 2.

[0102] Specifically, the bottom of the installation groove 11 is sealed to prevent the liquid in the plate body 1 from flowing out of the installation groove 11 and avoid electric leakage, thereby improving the use safety.

[0103] In this embodiment, the resistance measurement component 2 is fixed in the installation groove 11. In this embodiment, the height of the plate body 1 is defined as the height from the inner bottom of the plate body 1 to the opening of the plate body 1.

[0104] Specifically, the installation groove 11 is a groove provided on the inner side wall of the disk body 1, and the opening of the installation groove 11 faces the axis of the disk body 1. One side of the installation groove 11 is flush with the bottom of the disk body 1, and the other side of the installation groove 11 faces the opening direction of the disk body 1.

[0105] In this embodiment, the resistance measurement assembly 2 is snap-fitted and fixed in the installation groove 11.

[0106] Specifically, one of the resistance measurement assembly 2 and the installation groove 11 is provided with a snap groove, and the other is provided with a snap projection that cooperates with it, and the resistance measurement assembly 2 and the installation groove 11 are snap-fitted and fixed.

[0107] In this embodiment, the shape of the detection resistor 21 is adapted to the shape of the installation groove 11, and the bending arc of the detection resistor 21 is the same as the bending arc of the side wall of the disk body 1; the detection resistor 21 is placed in the installation groove 11, and the side wall of the detection resistor 21 and the side wall of the disk body 1 form the circular inner side wall of the disk body 1.

[0108] Specifically, the shape and size of the detection resistor 21 are not limited, as long as it is ensured that the detection resistor 21 can be connected to the installation groove 11 and can detect the liquid level in the disk body 1.

[0109] In this embodiment, the resistance measurement assemblies 2 are provided in one-to-one correspondence with the detection circuits 3; the detection circuit 3 has an input end and an output end 34, the resistance measurement assemblies 2 are connected in series at the input end, the resistance value between the resistance measurement assemblies 2 can change with the change of the liquid level in the disk body 1, and the output end 34 can output a corresponding resistance value according to the change of the resistance value.

[0110] Specifically, the second conductive end 23 of the resistance measurement assembly 2 is connected in series with the input end.

[0111] In this embodiment, the steaming box heating disk assembly includes a group of resistance detection circuits, the number of the resistance measurement assemblies 2 and the detection circuits 3 is one, and the two are connected in series.

[0112] In this embodiment, the detection circuit 3 further includes a first resistor 31 and at least one group of voltage dividing branches; the first resistor 31 is connected in series between the resistance measurement assembly 2 and the output end 34; at least one group of voltage dividing branches is connected in parallel with the first resistor 31; in the case of the change of the liquid level in the disk body 1, the output end 34 can output different resistance values.

[0113] In this embodiment, the detection circuit 3 includes a group of voltage dividing branches, and the voltage dividing branches are connected in parallel with the first resistor 31 to realize the voltage dividing function of the detection circuit.

[0114] In this embodiment, the voltage dividing circuit further includes a second resistor 32 and a capacitor 33. The capacitor 33 is connected in series with the second resistor 32, and the connection point between the capacitor 33 and the second resistor 32 is grounded.

[0115] Specifically, as long as voltage division can be achieved, the resistance values of the first resistor 31 and the second resistor 32 are set according to actual situations and are not limited herein.

[0116] In this embodiment, the resistance detection circuit further includes a power supply, and the power supply is electrically connected to the first conductive sheet 22.

[0117] Specifically, one end of the first conductive sheet 22 extends out of the lead to be connected to the power supply arranged outside the disk body 1, and one end of the second conductive sheet 23 extends out of the lead to be connected to the detection circuit 3 arranged outside the disk body 1.

[0118] In this embodiment, the voltage value of the power supply is 5V.

[0119] In this embodiment, a heater is arranged on the outer side of the bottom of the disk body 1. The heater is annular, and the liquid inside the disk body 1 is heated by arranging the heater.

[0120] In this embodiment, referring to Figure 7 , Figure 7 The dotted line in is the liquid level position. The resistance value is equal to conductivity * length / area. The shape of the detection resistor 21 is equivalent to a column with an isosceles right triangle cross-section. The two right sides of the isosceles right triangle are defined as L1, and the hypotenuse of the isosceles right triangle, that is, the length of the column, is L2.

[0121] In this embodiment, the resistance value of the detection resistor 21 is set according to actual situations and is not limited herein.

[0122] Preferably, the resistance value of the detection resistor 21 is 1 MΩ.

[0123] In this embodiment, referring to Figure 7 , taking the resistance value of the detection resistor 21 being 1 MΩ as an example for illustration, the following operations are also applicable when the resistance value of the detection resistor 21 is other values:

[0124] The liquid level height inside the disk body 1 is inversely proportional to the resistance value of the detection resistor 21, that is, L1 * L1 * L2 * ρ / 2 = 1 MΩ;

[0125] When the measured resistance value of the detection resistor 21 reaches 1 MΩ, the lowest liquid level is 0. When the detection resistor 21 is equal to 0, the liquid level ≥ L1.

[0126] When the liquid level in the pan body 1 is detected to be lower than 1 / 4*L1, the steaming box heating plate assembly is replenished with water until the water level reaches 3 / 4*L1 and then the replenishment stops. Controlling the liquid level within this range can achieve the best steam generation effect and prevent dry burning from damaging the steaming box heating plate assembly.

[0127] When there is no liquid in the pan body 1, the liquid level detection process in the steaming box heating plate assembly: When there is no liquid in the pan body 1, the current flows in sequence from the power supply, the first conductive end 22, the detection resistor 21, the second conductive piece 23 and the detection circuit 3, and flows out from the output end 34 of the detection circuit 3. By obtaining the voltage value of the output end 34, the resistance value connected between the first conductive piece 22 and the second conductive piece 23 can be determined, that is, the resistance value is 1 MΩ, and then the liquid level height in the pan body 1 is determined to be zero.

[0128] When there is liquid in the pan body 1, the liquid level detection process in the steaming box heating plate assembly: When there is liquid in the pan body 1, the current flows in sequence from the power supply, the first conductive end 22, the liquid in the pan body 1, the part of the detection resistor 21 located on the liquid surface, the second conductive piece 23 and the detection circuit 3, and flows out from the output end 34 of the detection circuit 3. By obtaining the voltage value of the output end 34, the resistance value connected between the first conductive piece 22 and the second conductive piece 23 can be determined. At this time, the resistance value is less than 1 MΩ, and then the liquid level height in the pan body 1 is determined to be non-zero. The specific liquid level height in the pan body 1 corresponding to the obtained resistance value is calculated.

[0129] The above has described the embodiments of the present application. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skilled persons in the technical field to understand the embodiments disclosed herein.

[0130] Without conflict, the above embodiments and the features in the embodiments in this article can be combined with each other.

[0131] The above-disclosed is only a preferred embodiment of the present invention, and of course it cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A steamer heating plate assembly, characterized in that: include: A tray body (1) capable of containing liquid, wherein a mounting groove (11) is provided on the inner side wall of the tray body (1); A resistance detection circuit, comprising a resistance measurement component (2) arranged in the installation groove (11) and a detection circuit (3) capable of outputting the resistance value of the resistance measurement component (2); The resistance measuring component (2) comprises a first conductive end and a second conductive end which are arranged opposite to each other, the first conductive end being arranged close to the bottom of the disk body (1), the second conductive end being arranged close to the opening of the disk body (1), and the second conductive end being connected in series with the detection circuit (3); any position of the resistance measuring component (2) can conduct electricity, and the detection circuit (3) can determine the resistance value of the resistance measuring component (2) at different liquid levels.

2. The steamer heating plate assembly according to claim 1, characterized in that: The resistance measuring component (2) comprises a detection resistor (21), a first conductive sheet (22) and a second conductive sheet (23); The first conductive sheet (22) is located at the first conductive end, the first conductive sheet (22) is fixed between the first end of the detection resistor (21) and the mounting groove (11), and the first conductive sheet (22) and the bottom of the disk body (1) are located in the same horizontal plane; The second conductive sheet (23) is located at the second conductive end, and the second conductive sheet (23) is fixed between the second end of the detection resistor (21) and the mounting groove (11).

3. The steamer heating plate assembly according to claim 2, characterized in that: The resistance detection circuit also includes a power supply, which is electrically connected to the first conductive sheet (22).

4. The steamer heating plate assembly according to claim 3, characterized in that: The voltage value of the power supply is 5V-10V.

5. The steamer heating plate assembly according to claim 2, characterized in that: Along the circumference of the disk body (1), the length of the detection resistor (21) is 2%-15% of the circumference of the disk body (1).

6. The steamer heating plate assembly according to claim 2, characterized in that: Along the direction from the bottom of the disk body (1) to the opening of the disk body (1), the height of the resistance measuring component (2) is equal to the height of the disk body (1).

7. The steamer heating plate assembly according to any one of claims 1 to 6, characterized in that: The shape of the detection resistor (21) is adapted to the shape of the mounting groove (11), and the curvature of the detection resistor (21) is the same as the curvature of the side wall of the disk body (1); The detection resistor (21) is placed in the installation groove (11), and the side wall of the detection resistor (21) and the side wall of the disk body (1) form a circular inner wall of the disk body (1).

8. The steamer heating plate assembly according to any one of claims 1 to 6, characterized in that: The resistance measuring component (2) and the detection circuit (3) are arranged in a one-to-one correspondence; The detection circuit (3) has an input end and an output end (34), the resistance measuring component (2) is connected in series to the input end, the resistance value between the resistance measuring components (2) can change with the change of the liquid level of the disk body (1), and the output end (34) can output a corresponding resistance value according to the change of the resistance value.

9. The steamer heating plate assembly according to claim 7, characterized in that: The detection circuit (3) further comprises a first resistor (31) and at least one group of voltage dividing branches; The first resistor (31) is arranged in series between the resistance measuring component (2) and the output end (34); The at least one group of pressure dividing branches is connected in parallel with the first resistor (31); When the liquid level in the disk body (1) changes, the output end (34) can output different resistance values.

10. A steamer, characterized in that: It comprises a box body, a water tank arranged on the box body and a steamer heating plate assembly as claimed in any one of claims 1 to 9, wherein the liquid in the water tank can flow to the steamer heating plate.

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