A cooking utensil with a double temperature measurement structure

Abstract

The application discloses a cooking utensil with a double-temperature-measuring structure, and relates to the technical field of kitchen appliances. The cooking utensil with the double-temperature-measuring structure comprises a container and a utensil body. The utensil body is provided with an electric heating disc, and a center hole is formed in the center area of the electric heating disc. A cavity is formed in the bottom of the electric heating disc, and the cavity is spatially isolated from the center hole. An electrically insulating sleeve is arranged in the cavity and coaxially arranged with the cavity. The material of the electrically insulating sleeve is mica plate or polyimide film, the breakdown voltage is greater than or equal to 20 kV / mm, and the thermal conductivity is less than or equal to 0.5 W / (m*K). A second temperature measuring piece is arranged in the electrically insulating sleeve, and the second temperature measuring piece is not in physical contact with the electric heating disc. A first temperature measuring piece is arranged in the center hole and in contact with the bottom of the container. The lead wires of the second temperature measuring piece and the first temperature measuring piece are led out to a control panel through the same sealing protection piece. The application detects the temperature in the environment, indirectly detects the average temperature of the heating disc, and the temperature accuracy of the heating device measured by the application is higher than that of point contact temperature measurement.

Description

Technical Field

[0001] This application relates to the field of kitchen appliance technology, specifically to a cooking appliance with a dual temperature measurement structure. Background Technology

[0002] A typical split-type electric cooker consists of a lower heating base and an upper container. Most products on the market achieve temperature control by detecting the container's temperature. A common practice is to place a high-temperature thermistor in the center of the lower heating base. This thermistor is mounted via a heat-conducting element, which is directly or indirectly attached to the appliance via an elastic element or other device (such as a temperature control base). Temperature is detected by the elastic contact between the heat-conducting element and the bottom of the container. When the temperature is too high, the heating element reduces its power or stops heating. To better control the heating efficiency of the heating plate and thus the container's temperature, products that simultaneously monitor both the appliance and the heating element have emerged, such as the cooking appliance disclosed in CN115942527A. However, existing temperature control devices for detecting the heating element's temperature are mostly open and point-contact type, relying on proximity to the heating element for temperature detection. This makes the detection results easily affected by ambient temperature. Utility Model Content

[0003] In view of this, this application provides a cooking appliance with a dual temperature measurement structure to solve the technical problem of low temperature detection accuracy of heating devices in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A cooking utensil with a dual temperature measuring structure includes a container and a body, wherein, The device is specifically equipped with an electric heating plate, with a central hole in its central area; The bottom of the heating plate has a cavity, which is isolated from the central hole space; The electrical insulation sleeve is set inside the cavity and is coaxial with the cavity. It is made of mica board or polyimide film, with a breakdown voltage ≥20kV / mm and a thermal conductivity ≤0.5W / (m·K). The second temperature measuring element is located inside the electrical insulation sleeve, and the second temperature measuring element has no physical contact with the heating plate; The temperature measuring element is installed in the central hole and abuts against the bottom of the container; The wires of temperature measuring element 2 and temperature measuring element 1 are led out to the control board through the same sealed protective component; The data from temperature measuring element one and temperature measuring element two are used to control the working status of the electric heating plate.

[0005] Furthermore, the central hole is located at the geometric center of the heating plate; the temperature measuring element is fixed in the central hole by an elastic support member with an elastic pressure range of 0.5-1.2N.

[0006] Furthermore, an air gap isolation structure is formed between the electrical insulating sleeve and the outer wall of the temperature measuring element, with an air gap width of 0.1-0.3 mm.

[0007] Furthermore, the lower end of the electrical insulating sleeve is provided with a ring lug, which slides and engages with the second temperature measuring element, and an elastic filler is provided between the ring lug and the ring platform of the second temperature measuring element.

[0008] Furthermore, the sealing and protective component is a ceramic-based sealing sleeve with a temperature resistance rating of ≥400℃; The wires of temperature measuring element two and temperature measuring element one are connected in parallel inside the sealed protective component.

[0009] Furthermore, the electric heating plate includes a heat-conducting layer, an upper heat insulation layer, a heating wire fixing ring, a middle heat insulation layer, a tray, a middle second heat insulation layer, and a lower heat insulation layer stacked from top to bottom, wherein the outer peripheral surface of the heating wire fixing ring is provided with a serrated cut to fix the heating strip.

[0010] Furthermore, the heat-conducting layer is provided with a downwardly extending cylindrical column, which is inserted into the central hole, and the upper heat insulation layer, the heating wire fixing ring, the middle heat insulation layer and the tray are all sleeved on the cylindrical column.

[0011] Furthermore, the temperature measuring element includes a first thermistor and a thermal floating frame. The thermal floating frame includes a first temperature sensing layer and a displacement fixing plate that are fastened together. The displacement fixing plate passes through the central hole and abuts against the bottom of the container. The sensing end of the first thermistor is located in the cavity between the first temperature sensing layer and the displacement fixing plate.

[0012] Furthermore, the thermal floating frame fixes the first thermistor through the displacement linkage, and a displacement spring is provided below the displacement linkage to provide buffering and stabilization during descent.

[0013] Furthermore, the second temperature measuring element includes a thermistor connecting rod and a second thermistor. The thermistor connecting rod is slidably installed in the cavity and floats elastically by a first spring. The two ends of the first spring abut against the shoulder of the thermistor connecting rod and the lower heat insulation layer.

[0014] Furthermore, the thermistor connecting rod is connected to a nut that rests against the lower surface of the lower insulation layer. By adjusting the nut, it is ensured that the second thermistor has no physical contact with the heating layer, and the temperature of the heating plate is indirectly detected by monitoring the ambient temperature inside the cavity.

[0015] In addition, this application also provides a control method based on the above-mentioned cooking equipment: A control method for a cooking appliance with a dual temperature sensing structure, applicable to the cooking appliance with the dual temperature sensing structure described above, comprising: Dual temperature monitoring mechanism: The temperature (Th) at the bottom of the container is monitored in real time using a temperature measuring device. The temperature of the heating plate (Tp) is monitored in real time by temperature measuring element 2. Layered temperature limiting protection: When Tp≥360℃, disconnect the power supply to the heating element and resume operation when Tp<360℃. When Th≥180℃, disconnect the power supply to the heating element and resume operation when Th<180℃. Temperature difference crack prevention protection: If |Tp-Th|≥280℃, then operate at a constant power of 500W until the temperature difference is <280℃; Dry-burn protection (activates 10 minutes after startup): When the temperature of the pot bottom rises by ≥5°C in 1 minute, an E3 alarm is triggered and the machine stops. When the heating plate temperature rises by ≥10℃ in 1 minute, an E3 alarm is triggered and the machine stops. Temperature surge protection: Cut off the power to the whole machine when the temperature of the pot bottom drops by ≥20℃ in 1 minute. The power supply to the entire machine will be cut off when the temperature of the heating plate drops by ≥100℃ in 1 minute.

[0016] Furthermore, it includes human-computer interaction logic: Status indication: In standby mode, the digital display shows "-----" and the function keys flash. During operation, the digital tube displays an animation of the racetrack, with a 5-minute countdown before the end. Function switching: The function keys cycle through various cooking modes; Appointment control: In the soup / reheat mode, you can set a timer (30min-12h) and keep warm (30min-4h). Adjust the time in 5-minute increments using the "▲" and "▼" keys; Error display: E1: Temperature sensor short circuit; E2: Temperature sensor open circuit; E3: Dry burn protection triggered.

[0017] As can be seen from the above technical solution, the advantages of this utility model are: 1. The temperature of a certain area is measured by the second temperature measuring device. The measurement result is equivalent to the average temperature of the multi-point area, making the measurement result closer to the current average temperature of the heating layer, thus improving the accuracy of the measurement result.

[0018] 2. The electrical insulation sleeve can reduce the influence of other parts and external ambient temperature on the temperature measuring element, thus improving the accuracy of the measurement results. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0020] Figure 1 This is a schematic diagram of the overall structure of this application.

[0021] Figure 2 This is an exploded view of the overall structure of this application.

[0022] Figure 3 This is a schematic diagram of the specific structure of the device in this application.

[0023] Figure 4 This is a schematic diagram of the electrical insulation sleeve of the device in this application.

[0024] Explanation of reference numerals in the attached drawings: 100-Heating plate; 1-First temperature sensing layer; 2-First thermistor; 3-Temperature measuring hole; 4-Second temperature sensing layer; 5-Second thermistor; 6-Thermistor connecting rod; 7-First spring; 8-Heat-conducting layer; 9-Upper insulation layer; 10-Heating wire fixing ring; 11-Middle insulation layer; 12-Tray; 13-Middle insulation layer; 14-Displacement device fixing plate; 15-Displacement device connecting rod; 16-Second spring; 17-Lower insulation layer; 18-Upper elastic pressure plate; 19-Displacement device spring; 20-Lower elastic pressure plate; 21-Cavity; 22-Electrically insulating sleeve; 221-Ring ear; 23-Elastic filler; 24-Control board; 200-Temperature measuring element two; 300-Container; 400-Temperature measuring element one. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and their descriptions are used to explain this application, but are not intended to limit it.

[0026] Example 1 refer to Figures 1 to 4 ,like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this embodiment provides a cooking appliance with a dual temperature measurement structure, including a container 300 and a container body. The container body is provided with a heating plate 100, with a central hole 3 in its central area. A cavity 21 is formed at the bottom of the heating plate 100, and the cavity 21 is spatially isolated from the central hole 3. An electrical insulating sleeve 22 is disposed in the cavity 21 and coaxially arranged with the cavity 21. The material is mica board or polyimide film, with a breakdown voltage ≥20kV / mm and a thermal conductivity ≤0.5W / (m·K). A second temperature measuring element 200 is disposed in the electrical insulating sleeve 22, and the second temperature measuring element 200 does not physically contact the heating plate 100 to achieve ambient temperature monitoring in the cavity 21. A first temperature measuring element 400 is disposed in the central hole 3 and abuts against the bottom of the container 300. The wires of the second temperature measuring element 200 and the first temperature measuring element 400 are led out to the control board 24 through the same sealing protective element 241. In this application, temperature measuring element 200 is used to monitor the ambient temperature inside cavity 21. Compared with point-to-point temperature measurement through direct physical contact with the heating layer (because the uneven distribution of the heating wire has a certain impact on the measurement results), temperature measuring element 200 in this application measures the temperature of a certain area. The measurement result is equivalent to the average temperature of multiple areas, making the measurement result closer to the average temperature of the current area of ​​the heating layer. This achieves indirect measurement of the heating plate temperature, resulting in high measurement accuracy and thus improving the temperature control accuracy of the product. With the assistance of electrical insulation sleeve 22, the influence of other parts and external ambient temperature on temperature measuring element 200 can be reduced.

[0027] In this application, the sealing and protective component 241 is a ceramic-based sealing sleeve with a temperature resistance rating of ≥400℃; the wires of the second temperature measuring element 200 and the first temperature measuring element 400 are connected in parallel inside the sealing and protective component 241 to provide protection for the wires of the second temperature measuring element 200 and the first temperature measuring element 400.

[0028] In this application, the specific structure of the electric heating plate 100 is as follows: the plate body of the electric heating plate 100 includes a heat-conducting layer 8, an upper heat insulation layer 9, a heating wire fixing ring 10, a middle heat insulation layer 11, a tray 12, a middle second heat insulation layer 13, and a lower heat insulation layer 17 stacked sequentially from top to bottom. The outer peripheral surface of the heating wire fixing ring 10 has serrated cuts. The heating strip is fixed and wrapped around the heating wire fixing ring 10 using the serrated cuts for limitation. The heating layer formed by the temperature measuring element 200 and the heating strip and heating wire fixing ring 10 may or may not be in physical contact. The cylinder 8 extends downward and is inserted into the temperature measuring hole 3. The upper insulation layer 9, the heating wire fixing ring 10, the middle insulation layer 11 and the tray 12 are all sleeved on the cylinder. The tray 12 and the middle insulation layer 13 are connected in a gap-like combination by multiple pads. The middle insulation layer 13 and the lower insulation layer 17 are fitted together, and the lower insulation layer 17 is provided with a sleeve that extends upward and is inserted into the temperature measuring hole 3. The setting of the cylinder and the sleeve improves the smoothness of the inner wall of the temperature measuring hole 3 in order to reduce the damage caused by friction between the temperature measuring hole 3 and the thermal atmosphere sensor 200.

[0029] In this application, the structure of the temperature measuring element 400 installed in the temperature measuring hole 3 located in the central area is as follows: The temperature measuring element 400 includes a first thermistor 2 and a thermal floating frame for fixing the first thermistor 2. The thermal floating frame includes a first temperature sensing layer 1 and a displacement fixing piece 14 fastened together. The displacement fixing piece 14 passes through the corresponding temperature measuring hole 3 and can contact the container 400. The displacement fixing piece 14 is provided with a displacement connecting rod 15 for mounting the first thermistor 2 so that the sensing end of the first thermistor 2 is located in the cavity between the first temperature sensing layer 1 and the displacement fixing piece 14. An elastic support / second spring 16 fitted on the corresponding sleeve is provided between the bottom of the displacement fixing piece 14 and the lower heat insulation layer 17. Under the action of the second spring 16, the thermal floating frame moves upward and presses against the lower edge of the corresponding cylinder or the tray 12, so that the thermal floating frame can float elastically, thereby causing the first thermistor 2 to float elastically, so that the thermal atmosphere sensor 200 can better contact the bottom of the container 400 and improve the temperature measurement accuracy.

[0030] The bottom of the lower insulation layer 17 is fixedly connected to an upper elastic pressure plate 18, and a lower elastic pressure plate 20 is fixedly connected to the upper elastic pressure plate 18. A displacement spring 19 is sandwiched between the upper elastic pressure plate 18 and the lower elastic pressure plate 20. During the descent of the displacement connecting rod 15, it can resist the displacement spring 19, which plays a role in buffering and stabilizing. The double elastic support of the elastic support / second spring 16 and the displacement spring 19 ensures that the displacement fixing plate 14 can better contact the container.

[0031] In this application, the temperature measuring element 200 has the following structure: the temperature measuring element 200 includes a thermistor connecting rod 6 and a second thermistor 5 fixedly installed on the thermistor connecting rod 6. The thermistor connecting rod 6 is slidably installed in the cavity 21, and the thermistor connecting rod 6 is provided with a shoulder that can abut against the lower surface of the tray 12. The two ends of the first spring 7 sleeved on the thermistor connecting rod 6 abut against the shoulder of the thermistor connecting rod 6 and the lower heat insulation layer 17, so that the thermistor connecting rod 6 can float elastically. The second thermistor 5 can be made to have no physical contact with the heating layer by adjusting the nut connected to the thermistor connecting rod 6 and pressing against the lower surface of the heat insulation layer 17. The temperature of the electric heating plate 100 is monitored by monitoring the ambient temperature in the cavity 21, and the temperature detection structure is made closer to the plate surface temperature by detecting the ambient temperature.

[0032] In this embodiment, the central hole 3 is located at the geometric center of the heating plate 100; the temperature measuring element 400 is fixed in the central hole 3 by the elastic support 16, with an elastic pressure range of 0.5-1.2N.

[0033] In this embodiment, an air gap isolation structure 23 is formed between the electrical insulating sleeve 22 and the outer wall of the temperature measuring element 200. The air gap width is 0.1-0.3mm. The air gap isolation structure 23 is used to reduce heat transfer, so that the temperature measured by the temperature measuring element 200 is closer to the actual temperature of the heating layer.

[0034] In this embodiment, the lower end of the electrical insulating sleeve 22 is provided with a ring lug 221, which slides and engages with the second temperature measuring element 200. An elastic filler 23 is provided between the ring lug 221 and the ring platform of the second temperature measuring element 200. The electrical insulating sleeve 22 is held against the heating layer by the action of the elastic filler 23. The limiting of the elastic filler 23 is used to prevent the second temperature measuring element 200 from contacting the heating layer under the action of the first spring 7, which simplifies the installation of the structure.

[0035] Example 2 In view of the above-disclosed cooking appliances with dual temperature measuring structures, a control method for cooking appliances with dual temperature measuring structures is disclosed, the specific control method being as follows: Dual temperature monitoring mechanism: The temperature at the bottom of the container (Th) is monitored in real time using temperature measuring element 1 (400); The temperature of the heating plate (Tp) is monitored in real time by temperature measuring element 2 (200); Layered temperature limiting protection: When Tp≥360℃, the power supply to the heating element is cut off, and it resumes operation when Tp<360℃; energy consumption is reduced by using the switching space. When Th≥180℃, disconnect the power supply to the heating element and resume operation when Th<180℃; ensure that the container is always within a safe temperature range during the heating process to avoid it from cracking due to excessive temperature. Temperature difference crack prevention protection: If |Tp-Th|≥280℃, operate at a constant power of 500W until the temperature difference is <280℃; avoid local overheating that could cause cracking. Dry-burn protection (activates 10 minutes after cooking device is started): When the temperature of the pot bottom rises by ≥5°C in 1 minute, an E3 alarm is triggered and the machine stops. When the heating plate temperature rises by ≥10℃ in 1 minute, an E3 alarm is triggered and the machine stops. Temperature surge protection: Cut off the power to the whole machine when the temperature of the pot bottom drops by ≥20℃ in 1 minute. The power supply to the entire machine will be cut off when the temperature of the heating plate drops by ≥100℃ in 1 minute. Human-computer interaction logic: Status indication: In standby mode, the digital display shows "-----" and the function keys flash. During operation, the digital tube displays an animation of the racetrack, with a 5-minute countdown before the end. Function switching: The function keys cycle through various cooking modes; Appointment control: In the soup / reheat mode, you can set a timer (30min-12h) and keep warm (30min-4h). Adjust the time in 5-minute increments using the "▲" and "▼" keys; Error display: E1: Temperature sensor short circuit; E2: Temperature sensor open circuit; E3: Dry burn protection triggered.

[0036] The safety of cooking equipment is improved by incorporating built-in layered temperature limiting protection, temperature difference crack prevention protection, dry burning protection, and temperature change protection. The human-computer interaction logic allows the cooking equipment to select functions as needed and control the heating power of the heating plate according to the selected function, making it convenient to use.

[0037] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to the embodiments of this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cooking appliance with a dual temperature measuring structure, comprising a container (300) and a body, characterized in that: The device is specifically provided with a heating plate (100) with a central hole (3) in its central area; a cavity (21) is provided at the bottom of the heating plate (100), and the cavity (21) is spatially isolated from the central hole (3); The electrical insulation sleeve (22) is set inside the cavity (21) and is coaxial with the cavity (21). The material is mica board or polyimide film, the breakdown voltage is ≥20kV / mm, and the thermal conductivity is ≤0.5W / (m·K). Temperature measuring element 1 (400) is disposed in the central hole (3) and abuts against the bottom of container (300); Temperature measuring element 2 (200) is installed inside the electrical insulation sleeve (22), and temperature measuring element 2 (200) has no physical contact with the heating plate (100); The wires of the second temperature measuring element (200) and the first temperature measuring element (400) are led out to the control board (24) through the same sealing protective element (241). The data from temperature measuring element one and temperature measuring element two are used to control the working status of the electric heating plate (100).

2. The cooking appliance with a dual temperature measuring structure according to claim 1, characterized in that, The central hole (3) is located at the geometric center of the heating plate (100); The temperature measuring element (400) is fixed in the center hole (3) by the elastic support (16), with an elastic pressure range of 0.5-1.2N.

3. The cooking appliance with a dual temperature measuring structure according to claim 1, characterized in that, An air gap isolation structure is formed between the electrical insulating sleeve (22) and the outer wall of the temperature measuring element (200), with an air gap width of 0.1-0.3 mm.

4. The cooking appliance with a dual temperature measuring structure according to claim 1, characterized in that, The lower end of the electrical insulating sleeve (22) is provided with a ring lug (221), which is slidably engaged with the second temperature measuring element (200), and an elastic filler (23) is provided between the ring lug (221) and the ring platform of the second temperature measuring element (200).

5. The cooking appliance with a dual temperature measuring structure according to claim 1, characterized in that, The sealing and protective component (241) is a ceramic-based sealing sleeve with a temperature resistance rating of ≥400℃; The wires of the second temperature measuring element (200) and the first temperature measuring element (400) are connected in parallel inside the sealing and protective element (241).

6. The cooking appliance with a dual temperature measuring structure according to claim 1, characterized in that: The electric heating plate (100) includes a heat-conducting layer (8), an upper heat insulation layer (9), a heating wire fixing ring (10), a middle heat insulation layer (11), a tray (12), a middle second heat insulation layer (13), and a lower heat insulation layer (17) stacked from top to bottom. The outer circumferential surface of the heating wire fixing ring (10) is provided with a serrated cut to fix the heating strip.

7. The cooking appliance with a dual temperature measuring structure according to claim 6, characterized in that: The heat-conducting layer (8) is provided with a downwardly extending cylindrical column, which is inserted into the central hole (3), and the upper heat insulation layer (9), the heating wire fixing ring (10), the middle heat insulation layer (11) and the tray (12) are all sleeved on the cylindrical column.

8. The cooking appliance with a dual temperature measuring structure according to claim 2, characterized in that: The temperature measuring element (400) includes a first thermistor (2) and a thermal floating frame. The thermal floating frame includes a first temperature sensing layer (1) and a displacement fixing piece (14) that are fastened together. The displacement fixing piece (14) passes through the central hole (3) and abuts against the bottom of the container (300). The sensing end of the first thermistor (2) is located in the cavity between the first temperature sensing layer (1) and the displacement fixing piece (14).

9. The cooking appliance with a dual temperature measuring structure according to claim 8, characterized in that: The thermal floating frame fixes the first thermistor (2) through the displacement link (15), and a displacement spring (19) is provided below the displacement link (15) to provide buffering and stabilizing effect during descent.

10. The cooking appliance with a dual temperature measuring structure according to claim 1, characterized in that: The second temperature measuring element (200) includes a thermistor connecting rod (6) and a second thermistor (5). The thermistor connecting rod (6) is slidably installed in the cavity (21) and floats elastically by a first spring (7). The two ends of the first spring (7) abut against the shoulder of the thermistor connecting rod (6) and the lower heat insulation layer (17).

11. The cooking appliance with a dual temperature measuring structure according to claim 10, characterized in that: The thermistor connecting rod (6) is connected to a nut that rests against the lower surface of the lower insulation layer (17). By adjusting the nut, it is ensured that the second thermistor (5) has no physical contact with the heating layer. The temperature of the electric heating plate (100) is indirectly detected by monitoring the ambient temperature inside the cavity (21).

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