Steam electric cooker and self-adaptive regulation and control method thereof

Abstract

The invention discloses a steam electric cooker and a self-adaptive regulation and control method thereof, and belongs to the technical field of household appliances. The steam electric cooker comprises a cooker body, a shell, a composite hot plate, a temperature measuring structure and a controller. The composite hot plate comprises a heating pipe, a water pipe and a heat-conducting medium wrapping the heating pipe and the water pipe, heat generated by the heating pipe can be conducted to the water pipe through the heat-conducting medium, and the water flow of the water pipe is controlled through a water flow controller. The temperature measuring structure is used for monitoring the temperature of the heating tube; the controller is electrically connected with the heating pipe, the water flow controller and the temperature measuring structure and used for reducing the power of the heating pipe and / or increasing the water flow of the water pipe according to signals or actions of the temperature measuring structure. By reducing the power of the heating pipe and / or increasing the water flow of the water pipe, the power of the heating pipe and the water flow of the water pipe can reach a balanced state quickly, the situation that the power and the water flow are not matched again in a short time is avoided, and the problem that the temperature controller is frequently switched on and off can be solved.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a steam rice cooker and its adaptive control method. Background Technology

[0002] In a steam rice cooker, the composite heating plate refers to a heating plate structure that includes an electric heating element and a water pipe. When the heating plate is running, the water in the water pipe can be heated into steam. In this way, part of the energy of the composite heating plate is output through heat transfer from the heating plate and the inner wall of the cooking cavity, and the other part is output through heated steam, which can improve the heating efficiency of the heating plate.

[0003] Composite heating plates have higher power than conventional electric heating plates. When there is a discrepancy between the water volume and the heating plate's power, the plate's temperature cannot reach equilibrium and continues to rise, posing a risk of melting. Therefore, a thermostat is usually installed to control the temperature of the composite heating plate. However, existing thermostats have the problem of frequent on / off switching, affecting cooking results and quality. Summary of the Invention

[0004] The main objective of this invention is to propose a steam rice cooker and its adaptive control method, aiming to solve the problem of frequent on / off switching of existing thermostats.

[0005] To achieve the above objectives, this invention provides a steam rice cooker, comprising a pot body, a shell, a composite heating plate, a temperature measuring structure, and a controller. The composite heating plate includes a heating element, a water pipe, and a heat-conducting medium covering the heating element and the water pipe. The heat generated by the heating element can be conducted to the water pipe through the heat-conducting medium, and the water flow rate of the water pipe is controlled by a water flow controller. The pot body is housed within the shell, and the composite heating plate is located below the pot body in its operating state. The heat-conducting medium of the composite heating plate is in contact with the bottom wall of the pot body, and the water pipe of the composite heating plate is connected to the pot body. The temperature measuring structure is used to monitor the temperature of the composite heating plate. The controller is electrically connected to the heating element, the water flow controller, and the temperature measuring structure, and is used to reduce the power of the heating element and / or increase the water flow rate of the water pipe based on the signal or action of the temperature measuring structure.

[0006] In one embodiment, the temperature measuring structure is a snap-action temperature controller, which is connected in series in the power circuit of the heating element and is electrically connected to the controller.

[0007] In one embodiment, the water pipe has a water inlet and a steam outlet, which are located at opposite ends of the water pipe. Along the flow direction of the water pipe, the distance between the temperature measuring structure and the steam outlet is less than or equal to 1 / 2 of the length of the water pipe, and the temperature measuring structure is located close to the heating element.

[0008] In one embodiment, the distance between the temperature measuring structure and the outer wall of the heating tube is ≤ 5 times the diameter of the heating tube.

[0009] In one embodiment, the steam rice cooker further includes:

[0010] The water tank is located on the outer wall of the shell;

[0011] The water supply system includes a water supply pipeline and a water pump. The water supply pipeline connects the water tank and the water inlet of the water pipe. The water pump is installed on the water supply pipeline and is electrically connected to the controller.

[0012] The steam delivery system includes a nozzle and a steam delivery pipeline. The nozzle orifice faces the cooking chamber inside the pot, and the steam delivery pipeline connects the steam outlet of the water pipe to the nozzle.

[0013] Secondly, the present invention provides an adaptive control method for a steam rice cooker. The steam rice cooker includes a composite heating plate, which includes a heating element, a water pipe, and a heat-conducting medium covering the heating element and the water pipe. The heat generated by the heating element can be conducted to the water pipe through the heat-conducting medium. The adaptive control method for the steam rice cooker includes:

[0014] S1: Monitor the temperature of the heating element to obtain the monitored temperature;

[0015] S2: When the monitored temperature increases to the preset temperature threshold, reduce the power of the heating element and / or increase the water flow rate of the water pipe.

[0016] S3: Repeat step S2 until the monitored temperature is not higher than the preset upper temperature threshold.

[0017] In one embodiment, in step S3, when the power of the heating element is reduced, the reduction value is a constant P; and / or, when the water flow rate of the water pipe is increased, the increase value is a constant Q.

[0018] In some embodiments, step S2 includes the following steps:

[0019] S21: When the monitored temperature reaches the preset upper threshold, execute the adjustment command to control the heating element to cut off the power and reduce the power of the heating element and / or increase the water flow of the water pipe.

[0020] S22: After executing the adjustment command, under the condition that the monitored temperature drops to the threshold of the preset temperature, control the power supply of the heating element to operate at the reduced power and / or the water flow controller to deliver water at the increased flow rate.

[0021] In one embodiment, the step "S1: monitor the temperature of the heating element and obtain the monitored temperature" includes: monitoring the heating element through a snap-action thermostat, setting an upper temperature threshold as the tripping temperature of the snap-action thermostat, setting an lower temperature threshold as the closing temperature of the snap-action thermostat, and obtaining the monitored temperature through the action of the snap-action thermostat.

[0022] In one embodiment, the step "S21: Under the condition that the monitored temperature reaches the preset temperature threshold, execute the adjustment command, control the heating element to be powered off and reduce the power of the heating element and / or increase the water flow rate of the water pipe" includes: when the sudden temperature controller trips, execute the adjustment command, the heating element is powered off, and the controller controls the power of the heating element to be reduced by P and / or controls the water flow rate of the water pipe to be increased by Q.

[0023] In one embodiment, the step "S22: After executing the adjustment command, under the condition that the monitored temperature drops to a threshold value under a preset temperature, control the heating element to be powered and operate at the reduced power" includes: after executing the adjustment command, when the snap-on thermostat is closed, powering the heating element to be powered and operating at the reduced power value P and / or the water flow controller to deliver water at the increased water flow value Q.

[0024] The steam rice cooker provided by this invention can reduce the power of the heating element and / or increase the water flow rate of the water pipe according to the signal or action of the temperature measuring structure. This can quickly bring the power of the composite heating plate and the water flow rate to a balanced state and avoid the situation where the power and water volume become mismatched again in a short period of time, thereby solving the problem of frequent on / off switching of the thermostat. Attached Figure Description

[0025] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the external structure of a steam rice cooker according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the internal structure of a steam rice cooker according to an embodiment of the present invention;

[0028] Figure 3 This is a front sectional view of a steam rice cooker according to an embodiment of the present invention;

[0029] Figure 4 This is a top sectional view of a steam rice cooker according to an embodiment of the present invention;

[0030] Figure 5 This is a side sectional view of a steam rice cooker according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic diagram of the circuit connection of the temperature measuring structure, controller, water flow controller, and heating element in one embodiment of the present invention;

[0032] Figure 7This is a schematic diagram of the composite heat plate in one embodiment of the present invention;

[0033] Figure 8 This is a flowchart illustrating the adaptive control method for a steam rice cooker in one embodiment of the present invention.

[0034] Explanation of icon numbers

[0035] 11. Temperature measuring structure; 12. Controller; 13. Composite heating plate; 131. Heating element; 132. Water pipe; 1321. Water inlet; 1322. Steam outlet; 133. Heat transfer medium; 14. Boiler body; 15. Shell; 16. Water tank; 17. Water supply system; 171. Water supply pipeline; 172. Water pump; 18. Steam supply system; 181. Nozzle; 182. Steam supply pipeline; 1821. Check valve. Detailed Implementation

[0036] It should be noted that if the embodiments of the present invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied. In the embodiments of the present invention, "at least one" refers to one or more, and "more" refers to two or more.

[0037] In the description of the embodiments of this invention, if technical terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of this application.

[0038] In the description of the embodiments of this invention, unless otherwise explicitly specified and limited, the technical terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0039] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0040] Currently, the heating elements in rice cookers on the market are conventional electric heating plates with relatively low power. Even with prolonged heating, there is no risk of the plate melting. Composite heating plates, on the other hand, integrate the electric heating plate and water pipes. They generally have higher power than ordinary electric heating plates, with some energy output through electric heating and the rest through steam heating, thus improving the heating efficiency of the plate.

[0041] However, composite heating plates can experience a mismatch between the heating element's power and the water flow rate, leading to a rapid temperature rise and potential safety hazards. Therefore, a thermostat is typically used to control the temperature. The conventional thermostat control method works as follows: when the monitored temperature exceeds the preset temperature, the thermostat cuts off the power to the composite heating plate, stopping operation; when the monitored temperature falls below the preset temperature, the thermostat restarts operation. While this method stops the heating plate when the temperature exceeds the preset temperature, the discrepancy between the heating element's power and the water flow rate after the heating plate starts operating can trigger the thermostat to cut off power again. Therefore, existing thermostats suffer from frequent on / off switching, affecting cooking results and quality.

[0042] Based on this, the present invention proposes to reduce the power of the composite heating plate and / or increase the water flow rate of the composite heating plate when it stops working due to power failure. This can quickly bring the power and water flow rate of the composite heating plate into a balanced state and avoid the situation where the power and water flow rate become mismatched again in a short period of time, thereby solving the problem of frequent on / off switching of the thermostat.

[0043] According to some embodiments of the present invention, the present invention provides a steam rice cooker, see reference. Figure 1-5As shown, the system includes a temperature measuring structure 11, a controller 12, a composite heating plate 13, a pot body 14, and a shell 15. The composite heating plate 13 includes a heating element 131, a water pipe 132, and a heat-conducting medium 133 covering the heating element 131 and the water pipe 132. The heat generated by the heating element 131 is conducted to the water pipe 132 through the heat-conducting medium 133, and the water flow rate of the water pipe 132 is controlled by a water flow controller. The pot body 14 is housed within the shell 15. The composite heating plate 13 is located below the pot body 14 in its operational state. The heat-conducting medium 133 of the composite heating plate 13 is in contact with the bottom wall of the pot body 14, and the water pipe 132 of the composite heating plate 13 is connected to the pot body 14. The temperature measuring structure 11 is used to monitor the temperature of the composite heating plate 13; Reference Figure 6 As shown, the controller 12 is electrically connected to the heating element 131, the water flow controller, and the temperature measuring structure 11, respectively, and is used to reduce the power of the heating element 131 and / or increase the water flow of the water pipe 132 according to the signal or action of the temperature measuring structure 11.

[0044] Heating element 131 refers to an electric heating device capable of resistance heating or electromagnetic heating. Besides bringing the food to cooking temperature, heating element 131 also needs to heat the liquid water in water pipe 132 to high-temperature steam. (Reference) Figure 7 As shown, to improve the heating efficiency of the water in the water pipe 132, the water pipe 132 can be positioned close to the heating element 131. In some embodiments, both the heating element 131 and the water pipe 132 can be circular tubes. In this case, the heating element 131 can be positioned on the outside of the water pipe 132. Of course, the heating element 131 can also be positioned on the inside of the water pipe 132. This allows the water pipe 132 to obtain more heat, thereby improving the steam production efficiency. The water pipe 132 can be made of food-grade stainless steel or plastic. If the heating element 131 is an electromagnetic heating device, then the water pipe 132 should be made of stainless steel.

[0045] Continue to refer to Figure 7 As shown, the heat-conducting medium 133 can cover the composite heating plate 13, meaning that the upper surface of the composite heating plate 13 in its operating state is entirely covered by the heat-conducting medium 133 to achieve uniform heating. Part of the heat-conducting medium 133 covers the heating tube 21 and the water pipe 22; the portion of the heat-conducting medium 133 covering the heating tube 21 and the water pipe 22 is the outer ring, and the remainder is the inner ring. The thickness of the outer ring is greater than that of the inner ring. The outer ring of the heat-conducting medium 133 can transfer heat between the heating tube 131 and the water pipe 132, improving the heating efficiency of the liquid water in the water pipe 132. The heat-conducting medium 133 can be aluminum, which has excellent thermal conductivity, thereby improving heat transfer efficiency; specifically, die-cast aluminum ADC12 can be selected. Furthermore, the water inlet 1321 and the steam outlet 1322 of the water pipe 132 extend beyond the heat-conducting medium 133.

[0046] A water flow controller is a device that can regulate the water flow in water pipe 132. It can be a water pump or a regulating valve such as a solenoid valve. This invention does not impose any specific limitations.

[0047] The temperature sensing structure 11 can be a temperature sensor or a temperature controller, or it can include both. The temperature sensor can be an NTC temperature sensor or a thermocouple sensor; the temperature controller can be a snap-action temperature controller, which can automatically cut off or connect the circuit when the temperature reaches the set value; the temperature controller can also be a proportional temperature controller or a power-adjusting temperature controller, which can adjust the heating power according to the set temperature. The temperature sensing structure 11 can be placed on the heat-conducting medium 133, so that heat can be quickly conducted to the temperature sensing structure 11 so that the temperature sensing structure 11 can respond.

[0048] The signal or action of the temperature measuring structure 11 can be a temperature signal transmitted from the temperature sensor to the controller, or it can be an action signal of the sudden-action thermostat disconnection. In some embodiments, when the temperature of the composite heating plate reaches a preset upper temperature threshold under the monitoring of the temperature measuring structure 11, the controller 12 can adjust the power of the heating element 131 to decrease and / or the water flow rate of the water pipe 132 to increase according to the signal or action of the temperature measuring structure 11.

[0049] During operation, the composite heating plate 13 experiences a mismatch between the power output of the heating element 131 and the water flow rate of the water pipe 132 controlled by the water flow controller. This mismatch results in a mismatch between the power output of the heating element 131 and the water flow rate of the water pipe 132. When the power output of the heating element 131 is at a positive deviation (the heating element 131 operates above its rated power) and the water flow rate of the water pipe 132 is at a negative deviation (the water flow rate of the water pipe 132 is less than the set flow rate), the heating element 131 will heat up rapidly. When the detected temperature of the composite heating plate 13 is higher than the preset temperature, it indicates that the power of the composite heating plate 13 is at a positive deviation value and / or the water flow rate is at a negative deviation value. Therefore, by reducing the power of the heating element 131 and / or increasing the water flow rate of the water pipe 132, the temperature of the composite heating plate 13 can be quickly reduced, and the power of the heating element 131 and the water flow rate of the water pipe 132 can be brought to a balance more quickly. This also avoids the situation where the power and water flow rate become mismatched again in a short period of time, thereby solving the problem of frequent on / off switching of the thermostat.

[0050] According to some embodiments of the present invention, the temperature measuring structure 11 is a snap-action temperature controller, which is connected in series in the power supply circuit of the heating tube 131 and is electrically connected to the controller 12.

[0051] The snap-on thermostat is connected in series with the heating element 131. The power supply to the heating element 131 can be cut off by opening or closing the snap-on thermostat, making control more reliable. The snap-on thermostat can be connected to the controller 1212 via a detection signal line, allowing the controller 12 to detect the snap-on thermostat's opening or closing action in a timely manner and respond quickly.

[0052] According to some embodiments of the present invention, reference Figure 7 As shown, the water pipe 132 has a water inlet 1321 and a steam outlet 1322, which are located at opposite ends of the water pipe 132. Along the flow direction of the water pipe 132, the distance between the temperature measuring structure 11 and the steam outlet 1322 is less than or equal to 1 / 2 of the length of the water pipe 132, and the temperature measuring structure 11 is located close to the heating element 131.

[0053] The inlet 1321 is used to supply liquid water into the water pipe 132, and the outlet 1322 is used to supply high-temperature steam. That is, after the liquid water enters the water pipe 132 through the inlet 1321, it is vaporized into high-temperature steam under the heating element 131 and output from the outlet 1322. Figure 7 For example, when the water pipe 132 is a circular pipe, the water inlet 1321 and the steam outlet 1322 are set close to each other.

[0054] The flow direction of water pipe 132 refers to the direction in which liquid water and high-temperature steam are transported within water pipe 132, and also to the direction of extension of water pipe 132. When water pipe 132 is a circular pipe, the flow direction of water pipe 132 is the circumferential direction of water pipe 132. When water pipe 132 is a straight pipe, the flow direction of water pipe 132 is the direction from water inlet 1321 to air outlet 1322, and also refers to the length direction of water pipe 132.

[0055] Along the flow direction of water pipe 132, the distance between the temperature measuring structure 11 and the steam outlet 1322 is less than or equal to half the length of water pipe 132, meaning the temperature measuring structure 11 is located in the middle to lower reaches of water pipe 132. After liquid water enters water pipe 132, it is heated into steam at the midpoint of the circumference of water pipe 132 or closer to the steam outlet 1322 (downstream of water pipe 132). The upstream region of water pipe 132 is a low-temperature liquid water region; therefore, the temperature of the entire composite heating plate 13 is uneven. When no water is injected into water pipe 132, the temperature of the entire water pipe 132 is relatively uniform. Placing the temperature measuring structure 11 in the middle to lower reaches of water pipe 132 ensures that the temperature of the entire composite heating plate 13 can meet the temperature requirements for both waterless and water-based cooking.

[0056] The temperature measuring structure 11 is positioned closer to the heating element 131 than the water pipe 132. Figure 7For example, both the heating element 131 and the water pipe 132 are approximately annular structures. The heating element 131 is located inside the water pipe 132. The temperature measuring structure 11 being located close to the heating element 131 means that the temperature measuring structure 11 is located within the inner ring of the heat-conducting medium 133 and is positioned inside the heating element 131. In other embodiments, when the heating element 131 is located outside the water pipe 132, the temperature measuring structure 11 being located close to the heating element 131 means that the temperature measuring structure 11 is positioned outside the heating element 131.

[0057] In other embodiments, the temperature sensing structure 11 may also be disposed on the outer ring of the heat-conducting medium 133. The temperature sensing structure 11 being positioned close to the heating element 131 means that it is positioned below the heating element 131 in its operational state, i.e., the temperature sensing structure 11 and the heating element 131 are distributed vertically. Positioning the temperature sensing structure 11 close to the heating element 131 allows it to respond to temperature changes promptly.

[0058] According to some embodiments of the present invention, the distance between the temperature measuring structure 11 and the outer wall of the heating tube 131 is ≤ 5 times the diameter of the heating tube 131. That is, the temperature measuring structure 11 is set as close as possible to the heating tube 131 to improve temperature control accuracy.

[0059] According to some embodiments of the present invention, reference Figure 1-5 As shown, the steam rice cooker also includes a water tank 16, a water supply system 17, and a steam supply system 18; the water tank 16 is disposed on the outer wall of the housing 15; the water supply system 17 includes a water supply pipe 171 and a water pump 172, the water supply pipe 171 is connected between the water tank 16 and the water inlet 1322 of the water pipe 132, the water pump 172 is disposed on the water supply pipe 171 and is electrically connected to the controller 12; the steam supply system 18 includes a nozzle 181 and a steam supply pipe 182, the nozzle 181 faces the cooking cavity inside the pot body 14, and the steam supply pipe 182 is connected between the steam outlet 1322 of the water pipe 132 and the nozzle 181.

[0060] by Figure 2-5 For example, water tank 16 is installed on the outer wall of housing 15 for storing water. Water tank 16 can be fixedly connected to housing 15 or detachably connected to housing 15. (Reference) Figure 4 As shown, water pump 172 is connected to water supply pipeline 171, and water pump 172 can deliver water from water tank 16 to water pipe 132 through water supply pipeline 171 and inlet 1321. (Reference) Figure 2-3 As shown in Figure 5, nozzle 181 is located above the pot body 14, and the nozzle outlet of nozzle 181 faces downward toward the pot body 14. A one-way valve 1821 is provided in the steam pipeline 182 to prevent steam backflow. High-temperature steam in water pipe 132 is transported to nozzle 181 through steam outlet 1322 and steam pipeline 182, thereby supplying high-temperature steam into the pot body 14.

[0061] When the steam rice cooker is running, the heating element 131 heats the pot body 14 directly on one hand, and heats the water in the water pipe 132 on the other hand to produce high-temperature steam. The high-temperature steam enters the pot body 14 through the steam outlet 1322, the steam pipeline 182, and the nozzle 181, thereby achieving the effect of three-dimensional heating from top to bottom.

[0062] According to some embodiments of the present invention, an adaptive control method for a steam rice cooker is also proposed. The steam rice cooker includes a composite heating plate 13, which includes a heating element 131, a water pipe 132, and a heat-conducting medium 133 covering the heating element 131 and the water pipe 132. The heat generated by the heating element 131 can be conducted to the water pipe 132 through the heat-conducting medium 133. (Reference) Figure 8 As shown, the adaptive control method of the steam rice cooker includes:

[0063] S1: Monitor the temperature of heating element 131 to obtain the monitored temperature;

[0064] S2: When the monitored temperature increases to the preset temperature threshold, reduce the power of the heating element 131 and / or increase the water flow rate of the water pipe 132.

[0065] S3: Repeat step S2 until the monitored temperature is not higher than the preset upper temperature threshold.

[0066] When the monitored temperature of the heating element 131 reaches the upper threshold of the preset temperature, it indicates that the power of the heating element 131 is at a positive deviation value and / or the water flow rate of the water pipe 132 is at a negative deviation value. Therefore, by reducing the power of the heating element 131 and / or increasing the water flow rate of the water pipe 132, the temperature of the composite heating plate 13 can be quickly reduced, and the power and water flow rate of the composite heating plate 13 can be brought into balance more quickly. This also avoids the situation where the power and water flow rate become mismatched again in a short period of time, thereby solving the problem of frequent on / off switching of the thermostat.

[0067] According to some embodiments of the present invention, in step S3, when the power of the heating element 131 is reduced, the power reduction value is a constant value P; and / or, when the water flow rate of the water pipe 132 is increased, the water flow rate increase value is a constant value Q.

[0068] The power reduction value P is constant, meaning that the power reduction value remains the same each time the power is adjusted; the water flow increase value Q is constant, meaning that the water flow increase value remains the same each time the water flow is adjusted.

[0069] In this embodiment, the power reduction value is set to a constant value P, and the water flow rate increase value is set to a constant value Q, which is beneficial for control. In addition, whenever the temperature is detected to be higher than the preset upper temperature threshold, the power of the heating element 131 is reduced by P and / or the water flow rate of the water pipe 132 is increased by Q until the power of the heating element 131 and the water flow rate of the water pipe 132 reach a balance. Under this balance, the temperature of the composite heating plate 13 remains stable and lower than the preset upper temperature threshold.

[0070] According to some embodiments of the present invention, step S2 includes the following steps:

[0071] S21: When the monitored temperature reaches the preset upper threshold temperature, execute the adjustment command to control the heating element 131 to cut off the power and reduce the power of the heating element 131 and / or increase the water flow of the water pipe 132.

[0072] S22: After executing the adjustment command, under the condition that the monitored temperature drops to the threshold of the preset temperature, control the heating tube 131 to supply power and operate at the reduced power and / or the water flow controller 12 to deliver water at the increased flow rate.

[0073] After each execution of steps S21 and S22, the power of the heating element 131 decreases once and / or the water flow rate increases once. After step S22 is executed, the heating element 131 is powered on, and as the heating element 131 operates under power for an extended period, the temperature of the composite heating plate increases. If the power of the heating element and / or the water flow rate do not reach a balance after this power reduction and / or water flow rate increase, the temperature of the composite heating plate will rise again to the level where the monitored temperature reaches the preset upper threshold. At this point, steps S21 and S22 will be repeated until the temperature of the composite heating plate no longer increases to the level where the monitored temperature reaches the preset upper threshold.

[0074] Of course, it's also possible that after performing steps S21 and S22 once, the heating element power and water flow rate will reach a balance, in which case there's no need to perform step S2 a second time. This situation also falls within the scope of steps S2 and S3.

[0075] According to some embodiments of the present invention, the step of “S1: monitoring the temperature of the heating element 131 and obtaining the monitoring temperature” includes: monitoring the heating element 131 through a snap-action thermostat, setting an upper temperature threshold as the tripping temperature of the snap-action thermostat, setting an lower temperature threshold as the closing temperature of the snap-action thermostat, and obtaining the monitoring temperature through the action of the snap-action thermostat.

[0076] A snap-action thermostat is a mechanical temperature control device that uses a bimetallic strip as the temperature sensing component. Its working principle is as follows: when the temperature reaches the set value, the bimetallic strip deforms due to thermal expansion. This deformation rapidly opens or closes the contacts, thereby cutting off or connecting the circuit and achieving temperature control. When the temperature drops to the reset temperature, the bimetallic strip returns to its original shape, and the contacts also return to their initial state. Snap-action thermostats can control temperature without relying on electronic components or software, offering advantages such as high accuracy, high reliability, and long lifespan.

[0077] According to some embodiments of the present invention, the step of “S21: under the condition that the monitored temperature reaches the preset temperature threshold, execute the adjustment command to control the heating element 131 to be de-energized and reduce the power of the heating element 131 and / or increase the water flow rate of the water pipe 132” includes: when the sudden temperature controller trips, execute the adjustment command, de-energize the heating element 131, and control the controller 12 to reduce the power of the heating element 131 by P and / or increase the water flow rate of the water pipe 132 by Q.

[0078] According to some embodiments of the present invention, the step of “S22: after executing the adjustment command, under the condition that the monitored temperature drops to a threshold at a preset temperature, control the power supply of the heating element and operate at the reduced power” includes: after executing the adjustment command, when the snap-on thermostat is closed, the heating element 131 is powered and operates at the reduced power P value and / or the water flow is controlled to deliver water at the increased water flow Q value.

[0079] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A steam rice cooker, characterized in that, include: The pot body, shell, and composite heating plate; the composite heating plate includes a heating element, a water pipe, and a heat-conducting medium covering the heating element and the water pipe. The heat generated by the heating element can be conducted to the water pipe through the heat-conducting medium, and the water flow rate of the water pipe is controlled by a water flow controller. The pot body is housed within the shell, and the composite heating plate is located below the pot body in its operating state. The heat-conducting medium of the composite heating plate is in contact with the bottom wall of the pot body, and the water pipe of the composite heating plate is connected to the pot body. The steam rice cooker also includes: A temperature sensing structure is used to monitor the temperature of the heating element; The controller is electrically connected to the heating element, the water flow controller, and the temperature measuring structure, respectively, and is used to reduce the power of the heating element and / or increase the water flow of the water pipe according to the signal or action of the temperature measuring structure.

2. The steam rice cooker as described in claim 1, characterized in that, The temperature measuring structure is a snap-on temperature controller, which is connected in series in the power circuit of the heating element and is electrically connected to the controller.

3. The steam rice cooker as described in claim 1 or 2, characterized in that, The water pipe has a water inlet and a steam outlet, which are located at opposite ends of the water pipe. Along the flow direction of the water pipe, the distance between the temperature measuring structure and the steam outlet is less than or equal to 1 / 2 of the length of the water pipe, and the temperature measuring structure is positioned close to the heating element.

4. The steam rice cooker as described in claim 3, characterized in that, The distance between the temperature measuring structure and the outer wall of the heating tube is ≤ 5 times the diameter of the heating tube.

5. The steam rice cooker as described in claim 1 or 2, characterized in that, The steam rice cooker also includes: The water tank is located on the outer wall of the shell. A water supply system, comprising a water supply pipeline and a water pump, wherein the water supply pipeline connects the water tank and the inlet of the water pipe, and the water pump is installed on the water supply pipeline and electrically connected to the controller; A steam delivery system, comprising a nozzle and a steam delivery pipeline, wherein the nozzle orifice faces the cooking chamber inside the pot, and the steam delivery pipeline connects the steam outlet of the water pipe to the nozzle.

6. An adaptive control method for a steam rice cooker, characterized in that, The steam rice cooker includes a composite heating plate, which comprises a heating element, a water pipe, and a heat-conducting medium covering the heating element and the water pipe. Heat generated by the heating element can be conducted to the water pipe through the heat-conducting medium. The adaptive control method of the steam rice cooker includes: S1: Monitor the temperature of the heating element to obtain the monitored temperature; S2: When the monitored temperature increases to a preset temperature threshold, reduce the power of the heating element and / or increase the water flow rate of the water pipe. S3: Repeat step S2 until the monitored temperature is not higher than the preset temperature threshold.

7. The adaptive control method for a steam rice cooker as described in claim 6, characterized in that, In step S3, when the power of the heating element is reduced, the reduction value is a constant P; and / or, when the water flow rate of the water pipe is increased, the increase value is a constant Q.

8. The adaptive control method for a steam rice cooker as described in claim 6, characterized in that, Step S2 includes the following steps: S21: When the monitored temperature reaches the preset temperature threshold, execute the adjustment command to control the heating element to be powered off and reduce the power of the heating element and / or increase the water flow rate of the water pipe. S22: After executing the adjustment command, under the condition that the monitored temperature drops to the threshold of the preset temperature, control the heating tube to be powered and operate at the reduced power and / or control the water flow controller to deliver water at the increased flow rate.

9. The adaptive control method for a steam rice cooker as described in claim 8, characterized in that, The step "S1: Monitor the temperature of the heating element and obtain the monitored temperature" includes: The heating element is monitored by a snap-on thermostat. The preset upper temperature threshold is the tripping temperature of the snap-on thermostat, and the preset lower temperature threshold is the closing temperature of the snap-on thermostat. The monitored temperature is obtained through the action of the snap-on thermostat.

10. The adaptive control method for a steam rice cooker as described in claim 9, characterized in that, In step S21: Under the condition that the monitored temperature reaches the preset temperature threshold, an adjustment command is executed to control the heating element to be powered off and reduce the power of the heating element and / or increase the water flow rate of the water pipe, including: When the thermostat trips, an adjustment command is executed, the heating element is de-energized, and the controller controls the power of the heating element to decrease by P and / or controls the water flow rate of the water pipe to increase by Q.

11. The adaptive control method for a steam rice cooker as described in claim 9, characterized in that, The step "S22: After executing the adjustment command, under the condition that the monitored temperature drops to a threshold at a preset temperature, control the power supply of the heating element and operate it at the reduced power" includes: After the adjustment command is executed, when the snap-on thermostat is closed, the heating element is powered and operates at a power reduced by the P value and / or the water flow controller delivers water at a flow rate increased by the Q value.

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