An electric heating switch circuit for a rice cooker used for both porridge and rice
Through the normally closed bimetallic sheet temperature control switch and function setting button, the problem of unstable temperature control of the rice cooker is solved, and the accurate temperature control of the rice cooker and the function switching of the rice cooker is realized, simplifying the structure and possessing porridge prevention. Overflow function.
Patent Information
- Application Number
- CN202010105958.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-02-20
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2040-02-20
AI Technical Summary
The temperature control ability of existing rice cookers is unstable, the assembly of magnets and levers is complicated and manual adjustment is difficult, which affects the use function of rice cookers, especially when cooking rice and porridge.
Using normally closed bimetallic sheet temperature control switch and function setting buttons, the temperature control is achieved through the bimetallic sheet temperature control switch and heating parts, instead of the magnetic steel lever power-breaking mechanism, simplifying the structure and realizing the between cooking and cooking porridge. Function switching, with the function of cooking porridge to prevent spilling.
Accurate temperature control of the rice cooker, simplifies the structure, avoids manual adjustment of the linkage between the magnet and the lever, ensures that the heating is stopped after the cooking is finished, and the function switching between cooking and porridge is achieved through the function setting button, and the cooking is available. Porridge prevents spilling function.
Smart Images
Figure CN111166154B_ABST
Abstract
Description
[Technical field]
[0001] The invention relates to an electric heating switch circuit of an electric rice cooker for porridge and rice. [Background Technology]
[0002] Most existing rice cookers are controlled by magnetic steel temperature controllers. When the temperature inside the rice cooker reaches the set temperature, the magnetic steel of the bottom heating plate will lose magnetism, and the heating switch will be turned on by the lever principle to stop the rice cooker from heating. However, when assembling the temperature control assembly of the magnetic steel and the lever, the lever needs to be installed and the magnetic steel needs to be debugged. At the same time, due to the complex assembly, different magnetic structures inside the magnetic steel, and different manually adjusted lever curvatures, the temperature control ability of the rice cooker is different, and it may even fail to meet the expected use standard, affecting the use function of the rice cooker. [Summary of the invention]
[0003] The invention overcomes the disadvantages of the above-mentioned technology and provides an electric heating switch circuit of an electric rice cooker for porridge and rice.
[0004] To achieve the above object, the present invention adopts the following technical solutions:
[0005] The invention discloses an electric heating switch circuit for a rice cooker for porridge and rice, comprising a rice cooker body 1, a heating plate 2 arranged on the bottom surface of the rice cooker body 1 and contacting with an inner pot for heating, a steam port 3 arranged on the rice cooker body 1, a bimetallic temperature control button switch 4 arranged on the rice cooker body 1 and used for closing when pressed and resetting when heated to disconnect the heating circuit of the rice cooker, a cooking temperature control switch 5 arranged on the rice cooker body 1 and contacting with the heating plate 2 and tripping when the heating plate 2 reaches a set cooking temperature and resetting and closing after cooling, and a heating plate 2 arranged on the rice cooker body 1. A function setting button 6 for setting a rice cooking mode or a porridge cooking mode, wherein the rice cooking temperature control switch 5 is connected in parallel with a heating element 7 which generates heat to disconnect the bimetallic temperature control button switch 4 when the rice cooking temperature control switch 5 is tripped, and the function setting button 6 is connected in parallel with a porridge cooking temperature control switch 8 which is arranged in the steam port 3 and works when the function setting button 6 sets the porridge cooking mode and trips when the steam temperature reaches the set porridge cooking temperature and resets and closes after cooling, wherein the tripping temperature of the porridge cooking temperature control switch 8 is lower than the tripping temperature of the rice cooking temperature control switch 5, and the other power supply end of the electric rice cooker is connected to the other end of the heating plate 2.
[0006] The electric heating switch circuit of the rice cooker for porridge and rice as described above is characterized in that the porridge cooking temperature control switch 8 and the rice cooking temperature control switch 5 are both normally closed bimetallic temperature control switches.
[0007] The electric heating switch circuit of the rice cooker for porridge and rice as described above is characterized in that the heating element 7 is a PCT heating element.
[0008] The electric heating switch circuit of the rice cooker for porridge and rice as described above is characterized in that a heat preservation plate 9 which works after the bimetallic temperature control button switch 4 is disconnected is connected between the input end of the bimetallic temperature control button switch 4 and the cooking mode connection end of the function setting button 6, and the heat preservation plate 9 is connected to the inner wall of the rice cooker body 1.
[0009] The electric heating switch circuit of the rice cooker for porridge and rice as described above is characterized in that the function setting button 6 is a single-pole double-throw switch, the common end of the single-pole double-throw switch is respectively connected to the output end of the rice cooking temperature control switch 5 and one end of the porridge cooking temperature control switch 8, and the cooking mode connection end of the single-pole double-throw switch is respectively connected to the heating plate 2 and the other end of the porridge cooking temperature control switch 8.
[0010] The electric heating switch circuit of the rice cooker for porridge and rice as described above is characterized in that a resistor R1, a heat preservation lamp LED1, and a diode D1 are connected in sequence between the input end of the bimetallic temperature control push button switch 4 and the common end of the single-pole double-throw switch, and a bias resistor R2 is provided between the common end of the single-pole double-throw switch and the other power supply end of the rice cooker for providing a loop current to the heat preservation lamp LED1 when the bimetallic temperature control push button switch 4 is disconnected.
[0011] The electric heating switch circuit of the rice cooker for porridge and rice as described above is characterized in that a cooking light switch K5, a cooking light LED2, a resistor R3, a diode D2, and a reverse-connected voltage-stabilizing diode D4 are sequentially connected between the common end of the single-pole double-throw switch and the other power supply end of the rice cooker, and the cooking light switch K1 is synchronously closed or disconnected with the cooking mode connection end of the single-pole double-throw switch.
[0012] The electric heating switch circuit of the rice cooker for porridge and rice as described above is characterized in that a porridge cooking light LED3, a resistor R4, a diode D3, and a reverse-connected voltage-stabilizing diode D5 are sequentially connected between the porridge cooking mode connection end of the single-pole double-throw switch and the other power supply end of the rice cooker.
[0013] The electric heating switch circuit of the rice cooker for porridge and rice as described above is characterized in that a temperature fuse FS is connected between the other power supply end of the rice cooker and the other end of the heating plate 2.
[0014] The beneficial effects of the present invention are:
[0015] After the normally closed bimetallic temperature control switch for cooking rice reaches the set cooking temperature and is disconnected, the heating element is energized and heated, so that the closed bimetallic temperature control button switch is tripped by the heat, thereby realizing the function of controlling the electric rice cooker to stop heating after cooking is finished, replacing the magnetic steel lever power-off mechanism, without the need to manually adjust the linkage between the magnetic steel and the lever, and having a simple structure and accurate temperature control; at the same time, the present invention is also provided with a function setting button to realize the function switching between cooking rice and cooking porridge, and the normally closed bimetallic temperature control switch for cooking porridge is connected by the function setting button, thereby realizing the function of preventing porridge from overflowing. [Drawings]
[0016] Figure 1 It is a schematic diagram of the structure of the electric rice cooker of the present invention;
[0017] Figure 2 A schematic diagram of the circuit structure of the heating in the cooking mode of the present invention;
[0018] Figure 3 A schematic diagram of the circuit structure of the rice cooking mode heat preservation of the present invention;
[0019] Figure 4 It is a schematic diagram of the circuit structure of the porridge cooking mode of the present invention. [Specific implementation method]
[0020] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings:
[0021] like Figure 1-4 As shown, an electric heating switch circuit of an electric rice cooker for porridge and rice comprises an electric rice cooker body 1, a heating plate 2 arranged on the inner bottom surface of the electric rice cooker body 1 and contacting with an inner pot for heating, a steam port 3 arranged on the electric rice cooker body 1, a bimetallic temperature control button switch 4 arranged on the electric rice cooker body 1 and used for closing when pressed and resetting when heated to disconnect the heating circuit of the electric rice cooker, a cooking temperature control switch 5 contacting with the heating plate 2 and tripping when the heating plate 2 reaches a set cooking temperature and resetting and closing after cooling, and a steam port 3 arranged on the electric rice cooker body 1. 1 is used to set a function setting button 6 for setting a rice cooking mode or a porridge cooking mode, the rice cooking temperature control switch 5 is connected in parallel with a heating element 7 which generates heat to disconnect the bimetallic temperature control button switch 4 when the rice cooking temperature control switch 5 is tripped, the function setting button 6 is connected in parallel with a porridge cooking temperature control switch 8 which is arranged in the steam port 3 and works when the function setting button 6 sets the porridge cooking mode and trips when the steam temperature reaches the set porridge cooking temperature and resets and closes after cooling, the tripping temperature of the porridge cooking temperature control switch 8 is less than the tripping temperature of the rice cooking temperature control switch 5, and the other power supply end of the electric rice cooker is connected to the other end of the heating plate 2.
[0022] Among them, the porridge cooking temperature control switch 8 and the rice cooking temperature control switch 5 are both normally closed bimetallic temperature control switches that trip when their own set temperatures are reached and reset after cooling. A heat preservation plate 9 that works after the bimetallic temperature control button switch 4 is disconnected is connected between the input end of the bimetallic temperature control button switch 4 and the cooking mode connection end of the function setting button 6, and the heat preservation plate 9 is connected to the inner wall of the rice cooker body 1.
[0023] When cooking Figure 2As shown, the function setting button 6 is set to the cooking mode, so that the porridge cooking temperature control switch 8 does not work, at this moment, the bimetallic temperature control button switch 4, the cooking temperature control switch 5, the function setting button 6, and the heating plate 2 are connected in series, and the bimetallic temperature control button switch 4 is closed when pressed, and at this moment, the movable metal sheet of the bimetallic temperature control button switch 4 contacts with the heating element 7, and the heating plate 2 generates heat after power-on to cook, and the cooking temperature control switch 5 detects the temperature of the heating plate 2, and when the temperature of the heating plate 2 reaches the temperature set by the cooking temperature control switch 5 itself, the cooking temperature control switch 5 is disconnected, and at this moment, the bimetallic temperature control button switch 4, the heating element 7, the function setting button 6, and the heating plate 2 are connected in series, and the heating element 7 is electrically heated, and when the temperature of the heating element 7 reaches the temperature set by the bimetallic temperature control button switch 4 itself, the movable metal sheet is reset to make the bimetallic temperature control button switch 4 disconnect and stop heating, and at this moment, as shown in FIG. Figure 3 As shown, the heat preservation plate 9 is connected in series with the heating plate 2 to perform heat preservation work, wherein the cooking temperature control switch 5 is reset and closed after cooling, and is still in a connected state when cooking next time.
[0024] When cooking porridge Figure 4 As shown, the function setting button 6 is set to the porridge cooking mode, so that the porridge cooking temperature control switch 8 is connected to work. At this time, the bimetallic temperature control button switch 4, the cooking temperature control switch 5, the porridge cooking temperature control switch 8, and the heating plate 2 are connected in series. After pressing the closed bimetallic temperature control button switch 4 to power on, the heating plate 2 heats up and performs the porridge cooking operation. Since the tripping temperature of the porridge cooking temperature control switch 8 is lower than the tripping temperature of the cooking temperature control switch 5, the porridge cooking temperature control switch 8 will trip before the cooking temperature control switch 5. Therefore, the porridge cooking temperature control switch 8 detects the steam temperature at the steam port 3. When the steam temperature reaches the temperature set by the porridge cooking temperature control switch 8 itself, the porridge cooking temperature control switch 8 trips, so that the heating plate 2 stops heating. The porridge cooking temperature control switch 8 is reset and connected after cooling for a period of time, and the heating plate 2 resumes heating, and this is repeated until the user manually disconnects the bimetallic temperature control button switch 4 to stop the heating plate heating operation.
[0025] In this case, the trip temperature set by the rice cooking temperature control switch 5 is 150°C, the trip temperature set by the bimetallic temperature control button switch 4 is 96-99°C, and the trip temperature set by the porridge cooking temperature control switch 8 is 95-99°C.
[0026] Among them, the heating element 7 is a PCT heating element. After the PCT heating element is energized, it can quickly generate high temperature, and can reset and rebound the active metal sheet of the bimetallic temperature control push button switch 4 in a very short time, and quickly and accurately disconnect the bimetallic temperature control push button switch 4. A temperature fuse FS is connected between the other power supply end of the rice cooker and the other end of the heating plate 2 to protect the rice cooker.
[0027] like Figure 2-4As shown, the function setting button 6 is a single-pole double-throw switch, the common end of the single-pole double-throw switch is respectively connected to the output end of the cooking temperature control switch 5 and one end of the porridge cooking temperature control switch 8, and the cooking mode connection end of the single-pole double-throw switch is respectively connected to the heating plate 2 and the other end of the porridge cooking temperature control switch 8.
[0028] like Figure 2 As shown, cooking light switch K5, cooking light LED2, resistor R3, diode D2, reverse voltage stabilizing diode D4 are connected in sequence between the SPDT switch common end and the other power supply end of the electric cooker, and the cooking light switch K1 is closed or disconnected synchronously with the SPDT switch cooking mode connection end. When the SPDT switch setting of the function setting button 6 is closed to the cooking mode, the cooking light switch K1 is closed synchronously, and at this moment, the bimetallic temperature control button switch 4, the cooking temperature control switch 5, the cooking light switch K5, the cooking light LED2, resistor R3, diode D2, reverse voltage stabilizing diode D4, and fuse FS form a loop, and the cooking light LED2 is luminous, and the user is prompted to cook, and wherein the reverse voltage stabilizing diode D4 is used to prevent the cooking light LED2 from being secretly bright.
[0029] like Figure 3 As shown, a resistor R1, a heat preservation lamp LED1, and a diode D1 are connected in sequence between the input end of the bimetal temperature control key switch 4 and the common end of the single-pole double-throw switch, and a bias resistor R2 is provided between the common end of the single-pole double-throw switch and the other power supply end of the electric cooker to provide a loop current to the heat preservation lamp LED1 when the bimetal temperature control key switch 4 is disconnected. When the bimetal temperature control key switch 4 is switched on after cooking is completed, the electric cooker is in a heat preservation state, and at this time, the resistor R1, the heat preservation lamp LED1, the diode D1, the bias resistor R2, and the fuse FS form a loop, so that the heat preservation lamp LED1 emits light, prompting the user that the heat preservation is being completed after cooking.
[0030] like Figure 4 As shown, a porridge cooking lamp LED3, a resistor R4, a diode D3, and a reverse-connected zener diode D5 are sequentially connected between the porridge cooking mode connection end of the single-pole double-throw switch and the other power supply end of the rice cooker. When the single-pole double-throw switch of the function setting button 6 is set to be closed to the porridge cooking mode, the bimetallic temperature control button switch 4, the cooking temperature control switch 5, the function setting button 6, the porridge cooking lamp LED3, the resistor R4, the diode D3, the reverse-connected zener diode D5, and the fuse FS form a loop, so that the porridge cooking lamp LED3 emits light, prompting the user that porridge is being cooked, wherein the reverse-connected zener diode D5 is used to prevent the porridge cooking lamp LED3 from secretly lighting up.
Claims
1. An electric heating switch circuit for a rice cooker for porridge and rice, comprising a rice cooker body (1), a heating plate (2) arranged on the bottom surface of the rice cooker body (1) and contacting with an inner pot for heating, and a steam port (3) arranged on the rice cooker body (1), characterized in that: A bimetallic temperature control key switch (4) arranged on the body of the rice cooker (1) and used for closing when pressed and resetting when heated to disconnect the heating circuit of the rice cooker is connected in series between a power supply end of the rice cooker and one end of the heating plate (2); a cooking temperature control switch (5) which contacts the heating plate (2) and trips when the heating plate (2) reaches a set cooking temperature and resets and closes after cooling; and a function setting key (6) arranged on the body of the rice cooker (1) and used for setting a cooking mode or a porridge cooking mode. The cooking temperature control switch (5) is connected in parallel with a heating element (7) which generates heat to disconnect the bimetallic temperature control key switch (4) when the cooking temperature control switch (5) trips. (6) is connected in parallel with a porridge cooking temperature control switch (8) arranged in the steam port (3) and working when the function setting button (6) sets the porridge cooking mode and trips when the steam temperature reaches the set porridge cooking temperature and resets and closes after cooling, the tripping temperature of the porridge cooking temperature control switch (8) is lower than the tripping temperature of the rice cooking temperature control switch (5), the other power supply end of the electric rice cooker is connected to the other end of the heating plate (2), the function setting button (6) is a single-pole double-throw switch, the common end of the single-pole double-throw switch is respectively connected to the output end of the rice cooking temperature control switch (5) and one end of the porridge cooking temperature control switch (8), and the rice cooking mode connection end of the single-pole double-throw switch is respectively connected to the heating plate (2) and the other end of the porridge cooking temperature control switch (8).
2. The electric heating switch circuit of a rice cooker for porridge and rice according to claim 1, characterized in that: The porridge cooking temperature control switch (8) and the rice cooking temperature control switch (5) are both normally closed bimetallic temperature control switches.
3. The electric heating switch circuit of a rice cooker for porridge and rice according to claim 1, characterized in that: The heating element (7) is a PCT heating element.
4. The electric heating switch circuit of a rice cooker for porridge and rice according to claim 1, characterized in that: A heat preservation plate (9) is connected between the input end of the bimetallic temperature control key switch (4) and the cooking mode connection end of the function setting key (6), and operates after the bimetallic temperature control key switch (4) is disconnected. The heat preservation plate (9) is connected to the inner wall of the rice cooker body (1).
5. The electric heating switch circuit of a rice cooker for porridge and rice according to claim 1, characterized in that: A resistor R1, a heat preservation lamp LED1, and a diode D1 are connected in sequence between the input end of the bimetallic temperature control push button switch (4) and the common end of the single-pole double-throw switch. A bias resistor R2 is provided between the common end of the single-pole double-throw switch and the other power supply end of the rice cooker for providing a loop current to the heat preservation lamp LED1 when the bimetallic temperature control push button switch (4) is disconnected.
6. The electric heating switch circuit of a rice cooker for porridge and rice according to claim 1, characterized in that: A cooking light switch K5, a cooking light LED2, a resistor R3, a diode D2, and a reverse-connected voltage-stabilizing diode D4 are sequentially connected between the common end of the single-pole double-throw switch and the other power end of the rice cooker. The cooking light switch K1 is synchronously closed or disconnected with the cooking mode connection end of the single-pole double-throw switch.
7. The electric heating switch circuit of a rice cooker for porridge and rice according to claim 1, characterized in that: A porridge cooking lamp LED3, a resistor R4, a diode D3, and a reverse-connected voltage-stabilizing diode D5 are sequentially connected between the porridge cooking mode connection end of the single-pole double-throw switch and the other power supply end of the electric rice cooker.
8. The electric heating switch circuit of a rice cooker for porridge and rice according to claim 1, characterized in that: A temperature fuse FS is connected between the other power supply end of the electric rice cooker and the other end of the heating plate (2).