CN210075606U - Heating disc of household electric stove - Google Patents
Heating disc of household electric stove Download PDFInfo
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- CN210075606U CN210075606U CN201920175409.5U CN201920175409U CN210075606U CN 210075606 U CN210075606 U CN 210075606U CN 201920175409 U CN201920175409 U CN 201920175409U CN 210075606 U CN210075606 U CN 210075606U
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- transmission assembly
- temperature transmission
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Abstract
The utility model discloses a domestic electric stove dish that generates heat, include: a heating plate body having an electric heating conductor; a temperature transmission assembly in thermal conduction with the electrical heating conductor, the temperature transmission assembly being contactable with and heatable by cookware; and a control unit including a temperature sensing module and a control module electrically connected to the electric heating conductor, the temperature transmission assembly transmitting heat on the cooker in the high temperature region to the control unit in the low temperature region, the temperature sensing module detecting a transmission temperature value of the temperature transmission assembly and transmitting the transmission temperature value to the control module, the control module being configured to control output power of the electric heating conductor such that the transmission temperature value is between a preset upper limit value and a preset lower limit value. The utility model discloses simple structure can control the temperature of cooking utensil to avoid the edible oil spontaneous combustion.
Description
Technical Field
The utility model relates to a domestic electric stove field, particularly, the utility model relates to a domestic electric stove dish that generates heat.
Background
In many countries, the main cause of kitchen fires is unattended cooking. When people cook food in homes, student apartments, senior apartments, hotel suites with kitchens, and the like, cookers filled with edible oil are left on the heat generating area of the electric cooker due to carelessness, forgetfulness, or lack of awareness of safe cooking, and since the temperature of the heat generating area can be raised to 650 ℃, which is much higher than the self-ignition point of the edible oil (generally 360 ℃ to 400 ℃), the edible oil left on the heat generating area for a long time may spontaneously ignite at high temperature.
Cooking fires and smoke can cause a number of preventable deaths, personal injuries and property losses each year. Therefore, preventing the ignition of cooking oil in cooking is very important for individuals, housing management companies, insurance companies, fire departments, cooking equipment manufacturers, and governments. Safety problems caused by ignition of edible oil during cooking have gradually attracted attention. For example, from 2015, UL858(UL us standard for safety of household electric cookers) required that a household electric cooker using a mosquito coil heater plate must pass UL 85860A, a mosquito coil heater plate edible oil spontaneous combustion test. According to the UL 85860A test requirement, a cooker filled with edible oil is placed on the surface of the heating coil of the mosquito coil, and the electric stove should be capable of heating for 30 minutes at the rated power setting without causing the edible oil to self-ignite.
Us patent 8723085 to calahan provides a method of temperature control of cast iron hot plates for electric furnaces. The device consists of a cast iron heating disc, a heating wire, a magnesium oxide insulating layer, a shell, a supporting frame and a temperature controller. The device has a complex structure and high manufacturing cost; meanwhile, the performance and short service life of the temperature controller limit the cooking performance and service life of the heating plate.
Us patent 6246033 to Shah provides a method of temperature control of a mosquito coil heater coil. The method adopts a control circuit and a temperature probe loop to realize temperature limit control. However, the method needs to change the wiring of the original control circuit of the electric furnace, install the heating plate control circuit board on the back of the electric furnace and modify the original heating plate. Due to the complexity of the entire installation, the installation must be done by a technician specially trained and licensed.
U.S. patent 9220130 to Smith provides another method of temperature control of a mosquito coil heater coil. The method is characterized in that a temperature sensing and controlling device is connected in series on an existing electric furnace line and is installed in the electric furnace, the air temperature below a heating plate is measured, and the on/off of a power supply of the heating plate is controlled. The method is only suitable for the electric furnace which is specially designed and manufactured.
The heating plate or the electric furnace designed by the above patent technology has the function of controlling the temperature of the heating plate. But has not gained wide market acceptance due to high manufacturing cost, poor cooking performance, short service life, complex installation, or being only suitable for specially designed electric furnaces.
In north america, half of the domestic stoves are electric stoves, none of which have the function of preventing spontaneous combustion of the edible oil, that is, do not meet the requirements of new safety standards. There is an urgent need for a heat generating plate for an electric furnace which can prevent spontaneous combustion of edible oil and can be easily mounted on an already installed electric furnace, while also requiring low cost and long life.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a domestic electric stove dish that generates heat is provided, it can guarantee to cook required temperature and simple structure when preventing the spontaneous combustion of edible oil.
In order to solve the technical problem, the utility model discloses a following technical scheme: a heating plate of a household electric stove, comprising:
a heating plate body having an electric heating conductor;
a temperature transmission assembly in thermal conduction with the electrical heating conductor, the temperature transmission assembly being contactable with and heatable by cookware; and the number of the first and second groups,
a control unit including a temperature sensing module and a control module electrically connected to the electric heating conductor, the temperature transmission assembly transmitting heat on the cooker in the high temperature region to the control unit in the low temperature region, the temperature sensing module detecting a transmission temperature value of the temperature transmission assembly and transmitting the transmission temperature value to the control module, the control module being configured to control output power of the electric heating conductor such that the transmission temperature value is between a preset upper limit value and a preset lower limit value.
Preferably, the household electric stove heating plate comprises a support, and the heating plate body is supported on the support.
Furthermore, the control unit is located below the temperature transmission assembly, an elastic component is arranged between the control unit and the support, and the elastic component applies upward elastic acting force to the control unit and the temperature transmission assembly so that the temperature transmission assembly extends to the heating plate body.
Further, a heat insulation layer is sleeved outside the temperature transmission assembly.
Further, a heat insulation pad and/or a reflection pad are arranged between the heating plate body and the control unit in the height direction, and the heat insulation pad and/or the reflection pad are positioned on the support.
Further, the elastic component is a spring plate or a spring.
Further, the temperature transmission assembly is L-shaped, and the control unit is connected to the tail end of the temperature transmission assembly.
Preferably, the temperature transmission assembly is located in the middle of the heating plate body, and a metal cap is arranged at the top end of the temperature transmission assembly.
Preferably, the control unit is a temperature controller.
Compared with the prior art, the beneficial effects of the utility model reside in that: the control unit compares the transmission temperature value of the temperature transmission assembly with a preset upper limit value and a preset lower limit value, and when the transmission temperature value exceeds the upper limit value or the lower limit value, the output power of the heating plate body is adjusted to control the temperature of the cooker, so that the temperature of the edible oil in the cooker is limited, and the edible oil is prevented from spontaneous combustion. Further, since the lower limit value is set, the minimum temperature required for daily cooking can be maintained. In addition, because the utility model has simple structure, the household electric stove which is installed and used can be conveniently assembled, and the cost is low.
Drawings
FIG. 1 is a schematic perspective view of a heating plate of a household electric furnace according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view corresponding to FIG. 1;
fig. 3 is a schematic perspective view of another embodiment of the present invention;
FIG. 4 is a cross-sectional view corresponding to FIG. 3;
fig. 5 is a schematic perspective view of another embodiment of the present invention;
fig. 6 is a cross-sectional view corresponding to fig. 5.
Description of the reference numerals
1-an electric heating wire; 2-a metal cap; 3-a temperature transmission component; 4-a heat insulation layer; 5-an insulating layer; 6-a reflective pad; 7-a heat insulation mat; 8-a control unit; 9-an elastic member; 10-a scaffold; 11-metal tube.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, which should not be construed as limiting the invention.
The utility model provides a domestic electric stove dish that generates heat with cooking utensil temperature restriction control function utilizes this dish that generates heat, and domestic electric stove can prevent the edible oil spontaneous combustion of culinary art in-process, still keeps the required minimum culinary art temperature of daily culinary art performance simultaneously. The heating plate comprises a heating plate body, a temperature transmission assembly and a control unit, the heating plate body transmits heat to the temperature transmission assembly, the temperature transmission assembly can be directly contacted with a cooker and transmits the higher temperature of the cooker to the control unit in the low-temperature area, and the control unit is electrically connected with an electric heating conductor of the heating plate. The control unit compares the transmitted temperature with a preset upper limit temperature value (called as an upper limit value for short) and a preset lower limit temperature value (called as a lower limit value for short), adjusts the output power of the heating plate, controls the temperature of the cooker and limits the temperature of the edible oil in the cooker. The output power of the heating plate is specifically embodied on the electric heating conductor, and the heating temperature can be adjusted by adjusting the output power of the electric heating conductor. The rated output power of the electrical heating conductor may be between 750W and 3500W.
On the basis of a large number of experiments, a temperature transfer model was established. The model describes the transfer of temperature between the surface of the heating plate body, the cookware, the cooking oil and the control unit, and takes into account the design and placement of the temperature transmission components, the type of control unit, the output power of the heating plate, the type of cookware, and so on. The upper and lower limit values of the control unit are determined on the basis of said temperature transfer model, the self-ignition point of the edible oil (typically between 360 ℃ and 400 ℃) and the minimum temperature required for daily cooking (typically above the boiling point of the edible oil, i.e. above 250 ℃). Specifically, the upper limit value is determined based on the combustion point of the cooking oil and the relationship between the temperature transmitted to the control unit 8 and the temperature of the cooking oil in the cooker. The relationship is based on the design and installation of the temperature transmission assembly 3, the type of control unit 8, the output power of the electric heating conductor and the type of cookware, and the temperature transmitted to the control unit 8 by the temperature transmission assembly 3 reaches an upper limit value when the temperature of the cooking oil in the cookware approaches but has not yet reached the ignition point of the cooking oil. The lower limit value is determined based on the minimum temperature required for daily cooking and the relationship between the temperature transmitted to the control unit 8 and the temperature of the cooking oil in the cooker. When the temperature of the cooking oil in the cooker is lowered to the minimum temperature required for daily cooking, the temperature transmitted to the control unit 8 reaches the lower limit value.
The electric heating conductor of the heating plate can be made of metal, nonmetal heat conduction materials or metal and nonmetal heat conduction materials, and can be formed by filament, film, printing and spraying.
Fig. 1 and 2 show a first embodiment of the present invention.
Referring to fig. 1 and 2, the heating plate includes a heating plate body, a temperature transmission member 3, and a control unit 8 electrically connected to the electric heating wire 1, which are integrally supported by a support 10. The heating plate body is integrally disc-shaped, oval, square or other shapes, the heating plate body comprises an electric heating wire 1, and the electric heating wire 1 is insulated and wrapped by an insulating layer 5 formed by magnesium oxide powder and is placed in a metal pipe 11. The control unit 8 comprises a temperature sensing module and a control module, which can be arranged in the same hardware, wherein the temperature sensing module is used for sensing the temperature, and the control module is used for controlling the output power of the electric heating wire 1.
The temperature transmission assembly 3 is made of a high thermal conductivity metal, surrounded by a thermal insulating layer 4, and is surmounted by a metal cap 2, which metal cap 2 can be considered as part of the temperature transmission assembly 3. The lower end of the temperature transmission assembly 3 is mounted on the temperature sensing module of the control unit 8, and the control unit 8 is integrally mounted on the elastic member 9. And, the control unit 8 is installed below the heating tray body, far away from the electric heating wire and the low temperature zone of the cooker. The control unit 8 and the temperature transmission component 3 are supported by the elastic component 9, so that the top end of the temperature transmission component 3 is higher than the surface of the heating plate body. When the cooker is placed on the heating plate, the bottom of the cooker presses on the top end of the temperature transmission component 3, so that the top end of the temperature transmission component 3 is in stable direct contact with the bottom of the cooker, and temperature transmission is facilitated. The middle part of the temperature transmission assembly 3 (excluding the parts of the top and lower ends connected to the control unit) is wrapped in an insulating layer 4. During cooking, the top end of the temperature transmission component 3 heated by the bottom of the cooker, the lower end of the temperature transmission component 3 in the low temperature region and the middle part of the temperature transmission component 3 wrapped by the heat insulation layer 4 form a heat pipe effect, and the temperature is ensured to be efficiently transmitted to the control unit 8 from the cooker.
A plurality of layers of heat insulation pads 6 and/or reflecting pads 7 are further arranged between the control unit 8 and the electric heating wires 1 serving as electric heating conductors, radiation emitted from the electric heating wires 1 to the lower side is reflected to the surface of the heating disc body, the air temperature around the lower ends of the control unit 8 and the temperature transmission assembly 3 is reduced, the temperature of a low-temperature area is cooler, the heat pipe effect is enhanced, and meanwhile the energy efficiency of the heating disc is improved.
Table 1 shows an example of this embodiment in which the temperature transmission member 3 is a 45 mm long, 16 mm diameter aluminum rod made of alumina 6061 and the control unit 8 is a bimetallic thermostat, Z3-250-. The control unit 8 is supported by a stainless steel spring sheet of 40mm x 8mm x 0.2mm 316L as an elastic component 9, and both ends of the spring sheet are arranged on the bracket 10. The top end of the temperature transmission component 3 is 5mm higher than the surface of the heating plate body, and the control unit 8 is 35mm lower than the surface of the heating plate body. The heating plate body is 8 inches in diameter, and the rated power of the electric heating wire 1 is 2400W. The reflective mat 6 is a 1 mm thick 150mm diameter aluminum dish and the insulation mat 7 is a 5mm thick fiberglass insulation layer.
TABLE 1
As shown in table 1, when cooking is performed at the rated power of the heating plate, when the temperature of the edible oil in the cooker approaches 320 ℃, the temperature transmitted to the control unit 8 reaches the upper limit value of 250 ℃, and the control unit 8 powers off the electric heating wire 1, so that the electric heating wire 1 stops heating; when the temperature of the edible oil is reduced to 250 ℃, the temperature transmitted to the control unit 8 reaches the lower limit value of 200 ℃, and the control unit 8 energizes the electric heating wire 1 to enable the electric heating wire 1 to generate heat. Therefore, the edible oil in the cooker forms a controlled temperature cycle, the temperature of the edible oil is always limited below the self-ignition point, and meanwhile, the lowest temperature of the edible oil is kept above 250 ℃, and the boiling point of the instant edible oil is above, so that the required cooking performance is maintained.
Fig. 3 and 4 show a second embodiment of the present invention.
In the present embodiment, the same component numerals as those of the first embodiment denote the same component names, and part of the modified structure of the first embodiment may be applied to this embodiment. For convenience of description, the following description focuses on differences from the first embodiment.
Referring to fig. 3 and 4, the temperature transmission assembly 3 is made of a highly heat conductive metal, surrounded by a thermal insulating layer 4, the top end of which is covered by a metal cap 2. The temperature transmission component 3 forms an L-shaped cantilever as an elastic mechanism, and the top end of the temperature transmission component 3 is bounced to be higher than the surface of the heating plate body. The lower end of the temperature transmission assembly 3 is installed at a temperature sensing module part of the control unit 8, which is located at a low temperature region below the heating plate body. When the cookware is placed on the heating plate, the cookware presses on the top end of the temperature transmission assembly 3, so that stable direct contact is formed between the top end of the temperature transmission assembly 3 and the bottom of the cookware. In the cooking process, the top end of the temperature transmission component 3 heated by the bottom of the cooker and the middle part of the temperature transmission component 3 wrapped by the heat insulation layer 4 at the lower end of the temperature transmission component 3 in the low-temperature region form a heat pipe effect, so that the temperature is transmitted to the control unit 8 from the cooker in real time and efficiently.
Table 2 shows an example of this embodiment in which the temperature transmission member 3 is a 60 mm long (45 mm vertical + 15 mm horizontal) 5mm diameter L-shaped cantilever beam made of 5052 aluminium, which is surrounded in its middle by a 5mm thick fibreglass insulation. The control unit 8 is a temperature controller Z3-225 and 210 manufactured by Toxico and is arranged 35mm lower than the surface of the heating plate body. The heating plate body is 8 inches in diameter, and the rated power of the electric heating wire 1 is 2400W.
TABLE 2
Cooking is performed under the rated power of the heating plate body, and the upper and lower limit values of the control unit 8 are correspondingly set to control the temperature of the cooker so as to maintain the required cooking performance, and meanwhile, the temperature of the edible oil in the cooker does not exceed the self-ignition point.
Fig. 5 and 6 show a third embodiment of the present invention.
In the present embodiment, the same component numerals as those of the first embodiment denote the same component names, and part of the modified structure of the first embodiment may be applied to this embodiment. For convenience of description, the following description focuses on differences from the first embodiment.
Referring to fig. 5 and 6, the lower end of the temperature transmission assembly 3 is mounted on the control unit 8, and the control unit 8 is mounted on the elastic member 9 to lift the temperature transmission assembly 3 above the surface of the heating plate body. When the cooker is placed on the heat generating plate, the bottom of the cooker presses the temperature transmission assembly 3 to the same height as the heat generating plate body. This brings the temperature transmission assembly 3 into direct contact with the cookware base and ensures real time transfer of temperature from the cookware base to the control unit 8.
Table 3 shows an example of the present embodiment in which the temperature transmission member 3 is an aluminum rod made of aluminum 5052, which is 8mm long and 20mm in diameter, and is installed at a position 5mm higher than the surface of the heat generating tray body. The control unit 8 is a bimetallic temperature controller manufactured by Toxico, Y23-16-315 and 245, and is arranged on a stainless steel spring NGW002-10-0.15 as an elastic component 9. The heating plate body is 8 inches in diameter, and the rated power of the electric heating wire 1 is 2400W.
TABLE 3
In cooking at the rated power of the heat generating plate, the upper and lower limit values of the control unit 8 are set accordingly to control the temperature of the cooker to maintain the desired cooking performance while the temperature of the cooking oil in the cooker does not exceed the self-ignition point.
In addition, the heating plate body is 5-20 mm higher than the electric furnace table surface, so that the air flow below the heating plate body can better flow, the air temperature around the lower ends of the control unit 8 and the temperature transmission assembly 3 is further reduced, and the heat pipe effect of the heat transfer device is improved.
In the heating plate of the household electric furnace of the utility model, the control unit 8 can be a temperature controller based on a switch in some embodiments; in some embodiments, the control unit 8 may be a set of relays that control the output power of the electric heating wire 1 through multi-stage regulation; in further embodiments, the control unit 8 may achieve power adjustment by adjusting the input voltage of the electric heating wire 1 using a thyristor.
The utility model discloses a household electric stove heating plate cooks under heating plate rated power, and when the edible oil temperature in the cooking utensil is close to the edible oil spontaneous combustion point, the temperature that transmits control unit 8 from the cooking utensil reaches the upper limit value promptly, and control unit 8 reduces the output of electric heating wire 1, makes the edible oil temperature be restricted below the spontaneous combustion point; when the temperature of the cooking oil in the cooker is lowered to the boiling point and the temperature transferred from the cooker to the control unit 8 reaches the lower limit value, the control unit 8 increases the output power of the electric heating wire 1 to maintain the minimum temperature required for daily cooking, thereby forming a closed loop control of the temperature of the cooking oil and the power of the heating plate in the cooker so that the temperature of the cooking oil is always limited below the ignition point while maintaining the desired cooking performance.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications and equivalents of the invention can be made by those skilled in the art within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the invention.
Claims (9)
1. A household electric stove heating plate is characterized by comprising:
a heating plate body having an electric heating conductor;
a temperature transmission assembly in thermal conduction with the electrical heating conductor, the temperature transmission assembly being contactable with and heatable by cookware; and the number of the first and second groups,
a control unit including a temperature sensing module and a control module electrically connected to the electric heating conductor, the temperature transmission assembly transmitting heat on the cooker in the high temperature region to the control unit in the low temperature region, the temperature sensing module detecting a transmission temperature value of the temperature transmission assembly and transmitting the transmission temperature value to the control module, the control module being configured to control output power of the electric heating conductor such that the transmission temperature value is between a preset upper limit value and a preset lower limit value.
2. The household electric furnace heating plate according to claim 1, characterized by comprising a bracket, and the heating plate body is supported on the bracket.
3. The household electric furnace heating plate according to claim 2, wherein the control unit is positioned below the temperature transmission assembly, an elastic component is arranged between the control unit and the bracket, and the elastic component applies upward elastic acting force to the control unit and the temperature transmission assembly so that the temperature transmission assembly extends to the position above the heating plate body.
4. The household electric furnace heating plate according to claim 3, characterized in that the temperature transmission assembly is externally sleeved with a heat insulation layer.
5. A heating plate for a domestic electric stove according to claim 3, wherein a heat insulating pad and/or a reflecting pad is provided between the heating plate body and the control unit in the height direction, the heat insulating pad and/or the reflecting pad being provided on the support.
6. A domestic electric stove heat generating plate according to claim 3, wherein the resilient member is a leaf spring or a spring.
7. The heating plate of the household electric furnace as claimed in claim 2, wherein the temperature transmission assembly is L-shaped, and the control unit is connected to the tail end of the temperature transmission assembly.
8. The household electric furnace heating plate according to claim 1, wherein the temperature transmission component is positioned in the middle of the heating plate body, and a metal cap is arranged at the top end of the temperature transmission component.
9. A heating plate of a domestic electric stove according to claim 1, wherein the control unit is a temperature controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920175409.5U CN210075606U (en) | 2019-01-31 | 2019-01-31 | Heating disc of household electric stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920175409.5U CN210075606U (en) | 2019-01-31 | 2019-01-31 | Heating disc of household electric stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210075606U true CN210075606U (en) | 2020-02-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920175409.5U Active CN210075606U (en) | 2019-01-31 | 2019-01-31 | Heating disc of household electric stove |
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| CN (1) | CN210075606U (en) |
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- 2019-01-31 CN CN201920175409.5U patent/CN210075606U/en active Active
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