Stove capable of accurately controlling temperature

Abstract

The utility model relates to a stove with accurate temperature control, which comprises a microcrystal plate, a stove plate, a thermocouple, a spring and a supporting seat, the microcrystal plate is arranged at the top of the stove plate, and a temperature measuring channel is arranged at the bottom of the stove plate; the thermocouple comprises a thermode, a ceramic column, a metal sheet and a junction box, the top of the ceramic column is open, an inner cavity of the ceramic column is provided with a wire hole allowing the thermode to penetrate through conveniently, the top opening is communicated with the wire hole, the metal sheet is arranged at the top opening, a superconductive insulating layer is arranged on the surface of the metal sheet, and the junction box is arranged on the surface of the superconductive insulating layer. The hot end of the thermode penetrates through the wire hole to be connected with the metal sheet, and the cold end of the thermode penetrates through the wire hole to extend out of the ceramic column to be connected with the junction box; according to the stove structure, the thermocouple is mounted at the bottom of the stove plate, and the upper end of the thermocouple penetrates through the temperature measuring channel to directly contact with the microcrystal plate, so that in-situ real-time measurement of the temperature of the microcrystal plate is realized.

Description

Technical Field

[0001] This utility model relates to a stove with precise temperature control. Background Technology

[0002] With the continuous improvement of living standards and the popularization of smart home appliances, people have put forward higher requirements for the temperature control performance of household stoves.

[0003] Especially in kitchen appliances such as electric ceramic cooktops and induction cooktops, the microcrystalline plate, as the core heating medium on the surface of the cooktop, directly affects the heating efficiency, cooking effect and equipment safety in terms of the accuracy of its temperature control.

[0004] Therefore, achieving rapid, accurate, and stable measurement of the surface temperature of the microcrystalline plate has become one of the key technologies for improving the overall performance of the furnace.

[0005] Currently, most temperature-controlled stoves on the market use thermocouples or thermistors as temperature sensing elements. However, in existing technologies, thermocouples usually cannot directly contact the surface of the microcrystalline plate. Their probes are mostly installed inside the stove, near the heating plate, and there is a certain heat conduction path between them and the microcrystalline plate. This results in a lag in temperature response and a large measurement error. Especially when the microcrystalline plate is heated unevenly or the environment changes significantly, it cannot accurately reflect its actual temperature, thus affecting the temperature control accuracy and user experience.

[0006] In addition, in the existing thermocouple structure, there is a certain degree of electrical coupling or leakage risk between the hot junction and the metal shell and conductive components. Especially under complex working conditions such as high temperature and humid heat, it is easy to cause temperature signal drift or increased error, or even cause control failure, which is not conducive to the stable operation of the furnace under high performance and long life conditions.

[0007] Therefore, there is an urgent need for a novel thermocouple temperature measuring device with accurate temperature measurement and good electrical insulation performance, which can directly measure the temperature of the microcrystalline plate, so as to improve the temperature control response speed, accuracy and long-term stability of the stove, and meet the development needs of intelligent and high-end kitchen appliances. Utility Model Content

[0008] The purpose of this invention is to provide a furnace with accurate temperature measurement, good electrical insulation performance, direct measurement of microcrystalline plate temperature, and improved temperature control response speed.

[0009] The purpose of this utility model is achieved as follows:

[0010] A precise temperature-controlled stove includes a microcrystalline plate, a stove tray, a thermocouple, a spring, and a support base. The microcrystalline plate is disposed on the top of the stove tray, and a temperature measurement channel is opened at the bottom of the stove tray.

[0011] The thermocouple includes a thermoelectrode, a ceramic column, a metal sheet, and a junction box. The top of the ceramic column is open, and the inner cavity of the ceramic column has a wire hole for the thermoelectrode to pass through. The top opening and the wire hole are connected. The metal sheet is disposed in the top opening, and a superconducting insulating layer is disposed on the surface of the metal sheet. The hot end of the thermoelectrode passes through the wire hole and connects to the metal sheet, and the cold end of the thermoelectrode passes through the wire hole and extends out of the ceramic column to connect to the junction box.

[0012] The outer wall of the ceramic column is provided with a ceramic outer ring;

[0013] The support base has an installation port and is fixed to the bottom of the furnace plate. The upper end of the ceramic tube of the thermocouple passes through the temperature measuring channel and extends into the inner cavity of the furnace plate, while the lower end of the ceramic tube of the thermocouple passes through the installation port and extends outward.

[0014] The spring is fitted onto the ceramic pillar, with the upper end of the spring abutting against the outer ring of the ceramic and the lower end of the spring abutting against the support base. The spring force pushes the ceramic pillar upward so that the superconducting insulating layer of the thermocouple is tightly attached to the microcrystalline plate.

[0015] This stove's structure achieves in-situ, real-time temperature measurement of the microcrystalline plate by mounting a thermocouple at the bottom of the cooking plate and having its upper end pass through a temperature measurement channel to directly contact the plate. Compared to the traditional method of indirectly measuring oven cavity temperature using thermocouples, this significantly improves temperature measurement accuracy and response speed, making the temperature control system more sensitive and efficient. This facilitates precise cooking control and enhances the user experience.

[0016] The thermocouple features a superconducting insulating layer on the surface of the metal sheet, effectively isolating the electrical coupling between the hot junction and the metal sheet, preventing leakage and signal interference, and ensuring stable transmission of the thermoelectric potential. This improves the accuracy of temperature measurement and the reliability of long-term operation. This design is particularly suitable for electric heating equipment operating in high-temperature and complex environments.

[0017] A ceramic outer ring is installed on the outer wall of the ceramic column, and a spring structure is used to ensure that the thermocouple is always subjected to an upward elastic force after installation, so that its superconducting insulation layer is tightly attached to the bottom of the microcrystalline plate. This automatic pressure compensation structure can continuously ensure reliable contact between the hot end and the microcrystalline plate, effectively avoiding loosening or poor contact caused by thermal expansion and contraction, vibration and other factors, further improving temperature measurement stability and furnace life.

[0018] The ceramic column and outer ring are made of materials with excellent high-temperature resistance and insulation, effectively resisting the impact of high-temperature furnace conditions on the temperature measuring structure and extending the service life of the thermocouple. Meanwhile, the spring-compression structure facilitates disassembly and maintenance, simplifying subsequent repair operations and demonstrating significant engineering application value.

[0019] The objective of this utility model can also be achieved by the following technical measures:

[0020] Furthermore, the metal sheet is a planar metal sheet.

[0021] By defining the metal sheet as a planar shape, the manufacturing process is simplified, and the coating of the superconducting insulating layer becomes more uniform and its thickness more controllable, thereby further improving insulation performance and process yield. The planar metal sheet is tightly fitted to the top of the ceramic pillar, effectively eliminating interface voids, reducing thermal resistance, ensuring rapid and stable transmission of the thermoelectric potential signal to the cold junction, reducing response time, and improving the system's dynamic temperature measurement performance.

[0022] Furthermore, the thermoelectric electrode includes a first wire and a second wire, one end of the first wire and the second wire are welded together to form the hot end, the other end of the first wire is the cold end for connecting to the junction box, and the other end of the second wire is the cold end for connecting to the junction box.

[0023] The first and second wires are clearly separated and welded together to form a hot end. The other ends are connected to the junction box respectively. This structure is widely compatible with various industrial junction boxes and thermocouple temperature measuring instruments. It is suitable for high temperature, high interference, and electrical complex occasions, and has good versatility and stability.

[0024] In this thermoelectric electrode structure, one end of the first and second wires is welded together to form a hot junction. This ensures that the two wires, made of different materials, form a stable thermal junction at high temperatures, effectively improving the generation efficiency of the thermoelectric potential and the sensitivity of the temperature measurement response. The reliability of the hot junction welding point is crucial for temperature measurement accuracy, and this structure can maintain good physical connection and electrical performance under high-temperature conditions.

[0025] The other ends of the conductors are independently led out as cold terminals and connected to junction boxes, which facilitates precise separation of cold terminal compensation and signal processing. This cold terminal structure allows measuring equipment to independently identify and convert the signal from each conductor, significantly improving the temperature measurement system's performance in terms of anti-interference and signal stability.

[0026] Furthermore, the wire hole is equipped with a ceramic partition, which divides the wire hole into a first wire hole and a second wire hole, and a cavity is provided between the top opening of the ceramic column and the upper end of the wire hole.

[0027] The first wire passes through the first wire hole, the upper end of the first wire is placed in the cavity, and the lower end of the first wire extends out of the ceramic column to form the cold end;

[0028] The second wire passes through the second wire hole, with its upper end placed inside the cavity and its lower end extending out of the ceramic column to form the cold end;

[0029] The bottom of the metal sheet is welded to the hot end.

[0030] The cold end is connected to the junction box, and the first and second wires located between the ceramic post and the junction box are fitted with heat shrink tubing.

[0031] This structure divides the wire hole into a first wire hole and a second wire hole by setting a ceramic partition inside the ceramic column. This ensures good electrical isolation and mechanical stability for the first and second wires as they pass through the ceramic column, effectively preventing measurement errors caused by wire contact, short circuits, or interference. The ceramic material of the partition has excellent high-temperature resistance and insulation properties, improving the overall system reliability.

[0032] The cavity structure between the top and the wire hole provides a relatively spacious operating area for the narrow interior of the ceramic, which facilitates the welding of the upper ends of the first and second wires to form a hot end in the cavity, and at the same time, the hot end is effectively welded to the bottom of the metal sheet, ensuring a stable thermal contact between the hot end and the metal sheet, and improving the thermal response speed and thermoelectric signal transmission efficiency.

[0033] Furthermore, the cold ends of both the first and second conductors are fitted with heat-shrink tubing after extending from the ceramic pillar, providing excellent insulation, sealing, and stress buffering. This prevents bending, friction, or environmental contamination from affecting conductor performance, further enhancing the thermocouple's durability and stability in high-temperature and harsh environments. The overall structure optimizes electrical performance and mechanical reliability, extending the sensor's lifespan.

[0034] The beneficial effects of this utility model are as follows:

[0035] This invention achieves in-situ, real-time temperature measurement of the microcrystalline plate by installing a thermocouple at the bottom of the oven tray and having its upper end pass through the temperature measurement channel to directly contact the microcrystalline plate. Compared to the traditional method of indirectly measuring the oven cavity temperature using thermocouples, this significantly improves temperature measurement accuracy and response speed, making the temperature control system more sensitive and efficient, facilitating precise cooking control, and enhancing the user experience.

[0036] In this invention, the thermocouple has a superconducting insulating layer on the surface of the metal sheet, effectively isolating the electrical coupling between the hot junction and the metal sheet, preventing leakage and signal interference, and ensuring stable transmission of the thermoelectric potential, thereby improving the accuracy of temperature measurement and the reliability of long-term operation. This design is particularly suitable for electric heating equipment in high-temperature and complex operating environments.

[0037] This invention features a ceramic outer ring on the outer wall of the ceramic column, coupled with a spring structure, ensuring that the thermocouple is always subjected to an upward elastic force after installation, thus keeping its superconducting insulation layer tightly attached to the bottom of the microcrystalline plate. This automatic pressure compensation structure continuously guarantees reliable contact between the hot end and the microcrystalline plate, effectively preventing loosening or poor contact caused by thermal expansion and contraction, vibration, and other factors, further improving temperature measurement stability and furnace lifespan.

[0038] This invention utilizes ceramic columns and outer rings with excellent high-temperature resistance and insulation properties, effectively resisting the impact of high-temperature furnace conditions on the temperature measuring structure and extending the service life of the thermocouple. Simultaneously, the spring-compression structure facilitates disassembly and maintenance, simplifying subsequent repair operations and demonstrating significant engineering application value. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the stove.

[0040] Figure 2 This is a schematic diagram of the stove from another angle.

[0041] Figure 3 This is the front view of the stove.

[0042] Figure 4 This is a cross-sectional view of the stove.

[0043] Figure 5 This is an assembly diagram of the stove.

[0044] Figure 6 This is an assembly diagram of the stove from another angle.

[0045] Figure 7 This is a schematic diagram of a thermocouple.

[0046] Figure 8 This is the front view of the thermocouple.

[0047] Figure 9 This is a cross-sectional view of a thermocouple.

[0048] Figure 10 This is an assembly diagram of a thermocouple.

[0049] Figure 11 This is another angle of the thermocouple assembly diagram. Detailed Implementation

[0050] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0051] Implementation examples, in conjunction with Figures 1 to 11 As shown, a stove with precise temperature control includes a microcrystalline plate 1, a stove plate 2, a thermocouple 3, a spring 4, and a support base 5. The microcrystalline plate 1 is disposed on the top of the stove plate 2, and a temperature measuring channel 21 is opened at the bottom of the stove plate 2.

[0052] The thermocouple 3 includes a thermoelectrode 31, a ceramic column 32, a metal plate 33, and a junction box 34. The ceramic column 32 has a top opening 321 and an inner cavity with a wire hole 322 for the thermoelectrode 31 to pass through. The top opening 321 and the wire hole 322 are connected. The metal plate 33 is disposed in the top opening 321 and has a superconducting insulating layer 6 on its surface. The hot end of the thermoelectrode 31 passes through the wire hole 322 and connects to the metal plate 33. The cold end of the thermoelectrode 31 passes through the wire hole 322 and extends out of the ceramic column 32 to connect to the junction box 34.

[0053] The outer wall of the ceramic column 32 is provided with a ceramic outer ring 7;

[0054] The support base 5 has an installation port 51. The support base 5 is fixed to the bottom of the furnace plate 2. The upper end of the ceramic tube of the thermocouple 3 passes through the temperature measuring channel 21 and extends into the inner cavity of the furnace plate 2. The lower end of the ceramic tube of the thermocouple 3 passes through the installation port 51 and extends outward.

[0055] The spring 4 is sleeved on the ceramic column 32. The upper end of the spring 4 abuts against the ceramic outer ring 7, and the lower end of the spring 4 abuts against the support seat 5. The elastic force of the spring 4 pushes the ceramic column 32 upward so that the superconducting insulating layer 6 of the thermocouple 3 is tightly attached to the microcrystalline plate 1.

[0056] Furthermore, the metal sheet 33 is a planar metal sheet.

[0057] Furthermore, the hot electrode 31 includes a first wire 8 and a second wire 9. One end of the first wire 8 and the second wire 9 are welded together to form the hot end 311. The other end of the first wire 8 is a cold end 312 for connecting to the junction box 34, and the other end of the second wire 9 is a cold end 312 for connecting to the junction box 34.

[0058] Furthermore, the wire hole 322 is equipped with a ceramic partition 10, which divides the wire hole 322 into a first wire hole 101 and a second wire hole 102. A cavity 103 is provided between the top opening 321 of the ceramic column 32 and the upper end of the wire hole 322.

[0059] The first wire 8 passes through the first wire hole 101, the upper end of the first wire 8 is placed in the cavity 103, and the lower end of the first wire 8 extends out of the ceramic column 32 to form the cold end 312.

[0060] The second wire 9 passes through the second wire hole 102, the upper end of the second wire 9 is placed in the cavity 103, and the lower end of the second wire 9 extends out of the ceramic column 32 to form the cold end 312;

[0061] The bottom of the metal sheet 33 is welded to the hot end 311.

[0062] The cold end 312 is connected to the junction box 34, and the first wire 8 and the second wire 9 located between the ceramic post 32 and the junction box 34 are fitted with heat shrink tubing.

[0063] Thermocouple 3 temperature measurement process:

[0064] In this thermocouple 3 design, the temperature measurement process first relies on the hot end 311 of the thermoelectrode 31 directly contacting the object to be measured (such as the microcrystalline plate 1). When the hot end 311 of the thermoelectrode 31 (formed by welding the first wire 8 and the second wire 9) contacts the object being measured, the temperature difference generated by the hot end 311 triggers a thermoelectric effect, that is, a thermoelectric potential is formed between the hot end 311 and the cold end 312. The temperature difference generated by the hot end 311 will generate a corresponding voltage signal at the cold end 312. This signal is transmitted through the cold end 312 to the junction box 34 and is finally read by the measuring instrument. The wire hole 322 and the ceramic partition 10 in the ceramic pillar 32 stably guide and separate the wires of the thermoelectrode 31, ensuring electrical isolation and stable connection between the hot end 311 and the cold end 312.

[0065] In addition, a superconducting insulating layer 6 is provided on the surface of the metal sheet 33. This layer further isolates the influence between electrical signals and heat sources, improves measurement accuracy, and prevents external electromagnetic interference. Because the outer wall of the ceramic column 32 is provided with a ceramic outer ring 7, this structure enhances the high-temperature resistance and mechanical stability of the entire thermocouple 3.

[0066] This furnace uses a thermocouple 3 with its hot end 311 directly contacting the microcrystalline plate 1 for temperature measurement, effectively avoiding the heat conduction lag and errors caused by traditional indirect temperature measurement. The hot end 311 is welded from two dissimilar wires, and the temperature difference between it and the cold end 312 generates a thermoelectric potential to achieve real-time output of the temperature signal. A spring 4 provides a continuous upward thrust, ensuring that the hot end 311 is firmly attached to the microcrystalline plate 1, ensuring stable and reliable temperature measurement contact. Combined with the superconducting insulating layer 6 and ceramic structure design, the accuracy of temperature measurement, response speed, and long-term stability of the system are significantly improved, thereby achieving efficient and precise temperature control of the furnace.

Claims

1. A precisely temperature-controlled stove, comprising a microcrystalline plate, a stove tray, a thermocouple, a spring, and a support base, characterized in that: The microcrystalline plate is set on the top of the furnace tray, and a temperature measurement channel is opened at the bottom of the furnace tray; The thermocouple includes a thermoelectrode, a ceramic column, a metal sheet, and a junction box. The top of the ceramic column is open, and the inner cavity of the ceramic column has a wire hole for the thermoelectrode to pass through. The top opening and the wire hole are connected. The metal sheet is disposed in the top opening, and a superconducting insulating layer is disposed on the surface of the metal sheet. The hot end of the thermoelectrode passes through the wire hole and connects to the metal sheet, and the cold end of the thermoelectrode passes through the wire hole and extends out of the ceramic column to connect to the junction box. The outer wall of the ceramic column is provided with a ceramic outer ring; The support base has an installation port and is fixed to the bottom of the furnace plate. The upper end of the ceramic tube of the thermocouple passes through the temperature measuring channel and extends into the inner cavity of the furnace plate, while the lower end of the ceramic tube of the thermocouple passes through the installation port and extends outward. The spring is fitted onto the ceramic pillar, with the upper end of the spring abutting against the outer ring of the ceramic and the lower end of the spring abutting against the support base. The spring force pushes the ceramic pillar upward so that the superconducting insulating layer of the thermocouple is tightly attached to the microcrystalline plate.

2. The oven with precise temperature control according to claim 1, characterized in that: The metal sheet is a planar metal sheet.

3. The oven with precise temperature control according to claim 1, characterized in that: The thermoelectric electrode includes a first wire and a second wire, one end of which is welded together to form the hot end, and the other end of the first wire is a cold end for connecting to the junction box, and the other end of the second wire is a cold end for connecting to the junction box.

4. The oven with precise temperature control according to claim 3, characterized in that: The wire hole is equipped with a ceramic partition, which divides the wire hole into a first wire hole and a second wire hole. A cavity is provided between the top opening of the ceramic column and the upper end of the wire hole. The first wire passes through the first wire hole, the upper end of the first wire is placed in the cavity, and the lower end of the first wire extends out of the ceramic column to form the cold end; The second wire passes through the second wire hole, with its upper end placed inside the cavity and its lower end extending out of the ceramic column to form the cold end; The bottom of the metal sheet is welded to the hot end; The cold end is connected to the junction box, and the first and second wires located between the ceramic post and the junction box are fitted with heat shrink tubing.

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