Liquid level detection system and method and cookware

Abstract

The invention provides a liquid level detection system and method and a pot. The system comprises a controller, a first temperature sensor and a second temperature sensor, wherein the first temperature sensor and the second temperature sensor are installed at different transverse positions and / or different longitudinal positions in the pot. The first temperature sensor and the second temperature sensor are respectively used for correspondingly detecting a first temperature signal and a second temperature signal in the pot body; the controller is used for comparing the received first temperature signal and the second temperature signal with a first preset temperature threshold value, if the preset time is exceeded, the first temperature signal and the second temperature signal are not smaller than the first preset temperature threshold value, the temperature difference between the first temperature signal and the second temperature signal is calculated, and the temperature difference is calculated. The temperature difference is compared with a preset temperature fluctuation threshold value, and if the temperature difference is larger than the preset temperature fluctuation threshold value, a firepower adjusting instruction and an alarm instruction are output. According to the invention, effective detection of any preset liquid level lower limit is realized, and thus the food taste is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of kitchen appliances, and in particular to a liquid level detection system, method and cookware. Background Art

[0002] When cooking food, in order to prevent dry burning, some sensors are generally set up to monitor the liquid level in the pot to prevent dry burning.

[0003] For example, a temperature sensor can be used to determine the liquid level based on the principle that when the liquid in the pot boils, there is a temperature difference between the inside and outside of the liquid.

[0004] In order to ensure the taste of food, the soup of certain dishes needs to be retained. The alarm cannot be triggered until the soup is almost dried up. The anti-dry burning alarm needs to be triggered when the lower limit of the liquid level is detected. This can be achieved when the temperature difference between the upper and lower liquid levels varies greatly, such as when the lid is opened, the lid is poorly sealed, or the fire is high. However, for slow cooking over low heat and with a good lid seal, the temperature difference between the liquid surface below and above the pot is small, and temperature detection and control of the arbitrarily set liquid level cannot be achieved. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a liquid level detection system, method and cookware, so as to realize the detection and control of any set liquid level in the pot.

[0006] In a first aspect, a liquid level detection system is provided, the system comprising a controller and a first temperature sensor and a second temperature sensor installed at different lateral positions and / or different longitudinal positions in a pot body; the installation heights of the first temperature sensor and the second temperature sensor are not less than a preset liquid level lower limit and do not exceed an initial liquid level in the pot body; the preset liquid level lower limit is set according to cooking requirements;

[0007] The first temperature sensor and the second temperature sensor are used to detect a first temperature signal and a second temperature signal in the pot body respectively, and transmit them to the controller;

[0008] The controller is used to calculate the temperature difference between the first temperature signal and the second temperature signal according to the first temperature signal and the second temperature signal, and compare the temperature difference with a preset temperature fluctuation threshold. If the temperature difference is greater than the preset temperature fluctuation threshold, a firepower adjustment instruction and an alarm instruction are output.

[0009] Optionally, the controller is also used to compare the received first temperature signal and the second temperature signal with the first preset temperature threshold respectively. If within the preset time, either the first temperature signal or the second temperature signal is less than the first preset temperature signal threshold, a firepower adjustment instruction and an alarm instruction are output; the first preset temperature threshold is the signal threshold when the current liquid level in the pot reaches the preset liquid level lower limit.

[0010] Optionally, the controller is also used to compare the received first temperature signal and second temperature signal with a second preset temperature signal threshold, respectively. If within a preset time, either the first temperature signal or the second temperature signal is less than the second preset temperature signal threshold and greater than or equal to the first preset temperature signal threshold, a reminder signal is output. The second preset temperature signal threshold is the signal threshold when the first temperature sensor or the second temperature sensor is located below the liquid level in the pot.

[0011] Optionally, the first temperature sensor and the second temperature sensor are respectively installed in the pot body through retractable parts.

[0012] Optionally, when the firepower adjustment instruction is to reduce the firepower value, the controller is also used to obtain the change rate of the first temperature signal and the second temperature signal. If the change rate of any temperature signal is greater than the preset change rate, the fire-off instruction and the second alarm instruction are output. The alarm level of the second alarm instruction is higher than that of the first alarm instruction.

[0013] In a second aspect, a liquid level detection method is provided, the method comprising:

[0014] Receiving a first temperature signal and a second temperature signal uploaded by a first temperature sensor and a second temperature sensor; the installation heights of the first temperature sensor and the second temperature sensor are not less than a preset lower limit of the liquid level and do not exceed an initial liquid level in the pot body; the preset lower limit of the liquid level is set according to cooking requirements;

[0015] Compare the received first temperature signal and the received second temperature signal with the first preset temperature threshold respectively;

[0016] If the first temperature signal and the second temperature signal are both not less than the first preset temperature threshold value over a preset time, then calculating the temperature difference between the first temperature signal and the second temperature signal;

[0017] comparing the temperature difference with a preset temperature fluctuation threshold;

[0018] If it is greater than the preset temperature fluctuation threshold, a firepower adjustment instruction and an alarm instruction are output; the first preset temperature threshold is the signal threshold when the current liquid level in the pot reaches the preset liquid level lower limit.

[0019] Optionally, the method further comprises:

[0020] If within a preset time, either the first temperature signal or the second temperature signal is less than a first preset temperature signal threshold, a firepower adjustment instruction and an alarm instruction are output.

[0021] Optionally, the method further comprises:

[0022] Comparing the received first temperature signal and the received second temperature signal with a second preset temperature signal threshold value respectively;

[0023] If within the preset time, either the first temperature signal or the second temperature signal is less than the second preset temperature signal threshold and greater than or equal to the first preset temperature signal threshold, a reminder signal is output. The second preset temperature signal threshold is the signal threshold when the first temperature sensor or the second temperature sensor is located below the liquid level in the pot.

[0024] Optionally, when the firepower adjustment instruction is to reduce the firepower value, the method further includes:

[0025] Obtaining the change rates of the first temperature signal and the second temperature signal;

[0026] If the change rate of any temperature signal is greater than the preset change rate, a flame-off instruction and a second alarm instruction are output, and the alarm level of the second alarm instruction is higher than that of the first alarm instruction.

[0027] In a third aspect, a cooker is provided, comprising a cooker body and any one of the liquid level detection systems of the first aspect, wherein a controller, an alarm and a fire control valve of the liquid level detection system are integrated and installed in the cooker body.

[0028] The embodiment of the present invention provides a liquid level detection system, method and cookware. The system is provided with two temperature sensors, and the two temperature sensors are located at different heights. Therefore, when the two temperature sensors fail to detect obvious temperature changes above and below the liquid level, the temperature difference between the two temperature sensors is used to further determine whether the preset liquid level lower limit has been reached. This ensures that the preset liquid level lower limit can be detected even when the temperature difference between the upper and lower liquid levels in the pot is small. By accurately detecting the preset liquid level lower limit, the taste of food is guaranteed.

[0029] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the circuit structure of a liquid level detection system provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the installation positions of two temperature sensors in a pot body provided in an embodiment of the present application;

[0034] Figure 3 A flow chart of a liquid level detection method provided in an embodiment of the present application.

[0035] Icons: 100, first temperature sensor; 200, second temperature sensor; 300, controller; 400, fire control valve; 500, alarm; 600, pot body. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Figure 1 A schematic diagram of the circuit structure of the liquid level detection system provided in an embodiment of the present application.

[0038] An embodiment of the present invention provides a liquid level detection system, which includes a controller 300 and a first temperature sensor 100 and a second temperature sensor 200 installed at different lateral positions and / or different longitudinal positions in a pot body 600 .

[0039] Specifically, the installation positions of the first temperature sensor 100 and the second temperature sensor 200 include the following three situations: 1. Same height but staggered in the lateral direction; 2. Different height and staggered in the lateral direction; 3. Different height but aligned in the lateral direction.

[0040] In order to make the temperature difference between the first temperature sensor 100 and the second temperature sensor 200 larger and easier to compare, in a preferred embodiment, the first temperature sensor 100 and the second temperature sensor 200 are installed in the second situation mentioned above, which is more conducive to sensing temperature difference changes compared with situation 1 and situation 3.

[0041] On the basis of the staggered arrangement, since the inner wall of the pot body 600 will also have a certain temperature after cooking, in order to prevent the temperature sensor from being affected by the temperature of the inner wall of the pot body 600, preferably, one of the first temperature sensor 100 or the second temperature sensor 200 is located on the central axis of the pot body 600. Figure 2As shown, the first temperature sensor 100 is located on the central axis, and the second temperature sensor 200 is located on the right side of the first temperature sensor 100. The closer to the central position, the less affected by the inner wall temperature, thereby improving the accuracy of the temperature detected by the temperature sensor.

[0042] The output ends of the first temperature sensor 100 and the second temperature sensor 200 are connected to the input end of the controller 300 .

[0043] In the embodiment of the present invention, the installation height of the first temperature sensor 100 and the second temperature sensor 200 can be adjusted according to the preset lower limit of the liquid level; the installation height of the first temperature sensor 100 and the second temperature sensor 200 is not less than the preset lower limit of the liquid level and does not exceed the initial liquid level in the pot body 600; the preset lower limit of the liquid level is set according to cooking requirements. For example, the user can set the preset lower limit of the liquid level according to the amount of soup that needs to be retained.

[0044] In a feasible implementation manner, the first temperature sensor 100 and the second temperature sensor 200 are respectively installed in the pot body 600 through retractable parts.

[0045] When the pot body 600 has a cover, the first temperature sensor 100 and the second temperature sensor 200 can be connected to the cover through the telescopic member. When not in use, the telescopic member can be adjusted to a storage state for easy storage. When in use, the telescopic member can be adjusted to an expanded state.

[0046] In a feasible embodiment, the telescopic member can be a miniature electric telescopic rod, the fixed end of the electric telescopic rod is fixedly connected to the cover of the pot body 600, and the movable end is fixedly connected to the first temperature sensor 100 or the second temperature sensor 200, and the electric telescopic rod is electrically connected to the controller 300, and the height of the first temperature sensor 100 and the second temperature sensor 200 are automatically adjusted by the controller 300.

[0047] In another feasible embodiment, the telescopic member may also be a manual telescopic rod, the length of which may be manually adjusted.

[0048] When there is no pot cover, the first temperature sensor 100 and the second temperature sensor 200 can also be connected to the inner wall of the pot body 600 through a retractable member and a connecting member, for example, the connecting member is arranged perpendicular to the inner wall of the pot body 600, one end is fixedly connected to the inner wall of the pot body 600, for example, by welding, and the other end is fixedly connected to one end of the retractable member, and the other end of the retractable member is connected to the first temperature sensor 100 or the second temperature sensor 200. The retractable member is arranged perpendicular to the connecting member. Specifically, the retractable member can also be an electric retractable rod or a manual retractable rod, which will not be described in detail here.

[0049] In a feasible real-time method, the inner wall of the pot body 600 is generally provided with a scale. After adding food and water, the initial liquid level can be checked through the scale, and a preset liquid level lower limit can be set according to the initial liquid level; the user can determine the installation height value of the first temperature sensor 100 and the second temperature sensor 200 according to the preset liquid level lower limit.

[0050] Specifically, the first temperature sensor 100 and the second temperature sensor 200 are used to detect the first temperature signal and the second temperature signal in the pot body 600 respectively, and transmit them to the controller 300;

[0051] The controller is used to compare the received first temperature signal and second temperature signal with the first preset temperature threshold value respectively. If any of the first temperature signal or the second temperature signal is less than the first preset temperature signal threshold value within the preset time, the firepower adjustment instruction and the alarm instruction are output; wherein, the preset time can be set according to the cooking time of the dish, for example, it is generally sufficient to stew meat in a pressure cooker for half an hour, then the preset time can be set to 15 minutes or 20 minutes. If no obvious liquid level change is detected after the time is exceeded, the temperature difference in the pot body 600 is small, resulting in the temperature detected by the temperature sensor always failing to reach the first preset temperature signal threshold value. If the first temperature signal and the second temperature signal are not less than the first preset temperature threshold value after the preset time is exceeded, the temperature difference between the first temperature signal and the second temperature signal is calculated, and the temperature difference is compared with the preset temperature fluctuation threshold value. If the temperature difference is greater than the preset temperature fluctuation threshold value, the firepower adjustment instruction and the alarm instruction are output; the first preset temperature threshold value is the signal threshold value when the current liquid level in the pot body 600 reaches the preset liquid level lower limit.

[0052] Since the temperature of the temperature sensor is highest below the liquid surface, the temperature decreases when it is exposed to the liquid surface. The higher the height above the liquid surface, the lower the temperature. Therefore, if the preset time is exceeded, the first temperature signal and the second temperature signal are both greater than the first preset temperature threshold, indicating that the temperature difference between the upper and lower liquid levels in the pot body 600 changes little, and it is possible that the liquid level in the pot body 600 has reached the preset lower limit of the liquid level. However, the temperature changes of the first temperature sensor 100 and the second temperature sensor 200 are small, and neither has dropped to the second preset temperature threshold. Therefore, the liquid level situation is further determined by judging the temperature difference between the two temperature sensors. If the temperature difference between the two exceeds the preset temperature fluctuation threshold, it means that the liquid level may have dropped to the preset lower limit of the liquid level. At this time, the firepower adjustment instruction and the alarm instruction are output to control the liquid level to continue to drop so as to achieve the best food taste.

[0053] In another feasible implementation manner, it also includes a firepower regulating valve 400, which is used to close or reduce the firepower value according to the firepower regulating instruction; and an alarm 500, which is used to issue an alarm according to the first alarm instruction.

[0054] In a feasible implementation, the controller 300 can transmit data with the first temperature sensor 100, the second temperature sensor 200, the alarm 500 and the fire power regulating valve 400 in a wired manner. When connected in a wired manner, the controller 300, the alarm 500 and the fire power regulating valve 400 can be integrated in the pot body 600. The pot body 600 is, for example, a pressure cooker, which does not need other stoves to provide firepower and can be cooked by plugging in electricity.

[0055] In another feasible implementation, the controller 300 can also be connected to the first temperature sensor 100, the second temperature sensor 200, and the alarm 500 by wireless means. In this way, the first temperature sensor 100, the second temperature sensor 200, the alarm 500, and the controller 300 are all integrated with wireless communication chips, such as 3G / 4G / 5G communication chips. When connected by wireless means, the controller 300, the alarm 500, and the fire control valve 400 can be independent of the pot body 600. In this case, the pot body 600 can be an ordinary stew pot, etc., which needs to be placed on an induction cooker or an open flame stove for cooking food. In this case, the fire control valve 400 is installed on the induction cooker or the open flame stove.

[0056] It should be noted that the signal collected by the temperature sensor is an analog signal, so the analog signal will be converted into a digital signal in the controller 300 to generate a digital signal.

[0057] The embodiment of the present invention sets two temperature sensors, and the two temperature sensors are at different heights. Therefore, when the two temperature sensors fail to detect obvious temperature changes above and below the liquid level, the temperature difference between the two temperature sensors is used to further determine whether the preset liquid level lower limit has been reached, thereby ensuring that when the temperature difference between the upper and lower liquid levels in the pot body 600 is small, the preset liquid level lower limit can still be detected. Since the preset liquid level lower limit is an arbitrarily set liquid level value, effective detection of any liquid level is achieved, thereby ensuring the taste of food.

[0058] Based on the above embodiment, the controller 300 is also used to compare the received first temperature signal and the second temperature signal with the second preset temperature signal threshold respectively. If within the preset time, either the first temperature signal or the second temperature signal is less than the second preset temperature signal threshold and greater than or equal to the first preset temperature signal threshold, a reminder signal is output. The second preset temperature signal threshold is the signal threshold when the first temperature sensor 100 or the second temperature sensor 200 is located below the liquid level in the pot body 600.

[0059] If within the preset time, either the first temperature signal or the second temperature signal is less than the second preset temperature signal threshold and greater than the first preset temperature signal threshold, it means that the preset liquid level lower limit has not been reached, but the temperature sensor has been exposed above the liquid surface and the current liquid level is about to reach the preset liquid level lower limit. At this time, an advance reminder can be given to achieve double anti-dry burning protection and improve the safety of cooking in the pot body 600.

[0060] In another embodiment, the reminder signal may also be sent to a remote terminal for remote reminder. For example, when the user is not at home, a remote reminder may be made to improve safety.

[0061] Based on the above embodiment, when the firepower adjustment instruction is to reduce the firepower value, the controller 300 is also used to obtain the change rate of the first temperature signal and the second temperature signal. If the change rate of any temperature signal is greater than the preset change rate, the fire-off instruction and the second alarm instruction are output. The alarm level of the second alarm instruction is higher than that of the first alarm instruction.

[0062] In one example, the rate of change of the temperature signal is the temperature change value within one minute. If the liquid level in the pot body 600 is burned out, the temperature in the pot body 600 will rise sharply, for example, from 100 degrees to 200 degrees. Then, by detecting the rate of change of the temperature signal, safety can be further improved and the alarm can be strengthened to prompt the user.

[0063] Based on the same inventive concept, a liquid level detection method is provided, such as Figure 3 As shown, the method comprises the following steps:

[0064] Step S301 : receiving a first temperature signal and a second temperature signal uploaded by the first temperature sensor 100 and the second temperature sensor 200 .

[0065] The installation height of the first temperature sensor 100 and the second temperature sensor 200 is adjusted according to the preset lower limit of the liquid level; the installation height of the first temperature sensor 100 and the second temperature sensor 200 is not less than the preset lower limit of the liquid level and does not exceed the initial liquid level in the pot body 600; the preset lower limit of the liquid level is set according to cooking requirements.

[0066] Step S302: Compare the received first temperature signal and the second temperature signal with the first preset temperature threshold respectively;

[0067] Step S303: If the first temperature signal and the second temperature signal are both not less than the first preset temperature threshold value after exceeding the preset time, the temperature difference between the first temperature signal and the second temperature signal is calculated.

[0068] Step S304: Compare the temperature difference with a preset temperature fluctuation threshold.

[0069] Step S305: If it is greater than the preset temperature fluctuation threshold, output a firepower adjustment instruction and an alarm instruction; the first preset temperature threshold is the signal threshold when the current liquid level in the pot body 600 reaches the preset liquid level lower limit.

[0070] The embodiment of the present invention sets two temperature sensors, and the two temperature sensors are at different heights. Therefore, when the two temperature sensors fail to detect obvious temperature changes above and below the liquid level, the temperature difference between the two temperature sensors is used to further determine whether the preset liquid level lower limit has been reached, thereby ensuring that when the temperature difference between the upper and lower liquid levels in the pot body 600 is small, the preset liquid level lower limit can still be detected. Since the preset liquid level lower limit is an arbitrarily set liquid level value, effective detection of any liquid level is achieved, thereby ensuring the taste of food.

[0071] Based on the above embodiment, the method further includes:

[0072] Step S306: If within a preset time, either the first temperature signal or the second temperature signal is less than a first preset temperature signal threshold, a firepower adjustment instruction and an alarm instruction are output.

[0073] Based on the above embodiment, the method further includes:

[0074] Step S307: Compare the received first temperature signal and the received second temperature signal with the second preset temperature signal threshold respectively;

[0075] Step S308: If within a preset time, either the first temperature signal or the second temperature signal is less than the second preset temperature signal threshold and greater than or equal to the first preset temperature signal threshold, then a reminder signal is output.

[0076] The second preset temperature signal threshold is a signal threshold when the first temperature sensor 100 or the second temperature sensor 200 is located below the liquid level in the pot body 600 .

[0077] By giving advance reminders, double protection against dry burning can be achieved, thereby improving the safety of cooking in the pot body 600.

[0078] Based on the above embodiment, when the firepower adjustment instruction is to reduce the firepower value, the method further includes the following steps:

[0079] Step S309: obtaining the change rates of the first temperature signal and the second temperature signal;

[0080] Step S310: If the change rate of any temperature signal is greater than a preset change rate, a fire-off instruction and a second alarm instruction are output, and the alarm level of the second alarm instruction is higher than that of the first alarm instruction.

[0081] Among them, steps S301-S308 constitute one implementation method, steps S301-S310 constitute another implementation method, and steps S301-S306, S309, and S310 constitute yet another implementation method.

[0082] In the case where the fire is not turned off, the safety can be further improved and the alarm can be strengthened to prompt the user by detecting the change rate of the temperature signal.

[0083] Based on the same inventive concept, a pot system is provided, comprising a pot body and any one of the liquid level detection systems of the first aspect, wherein a controller 300, an alarm 500 and a fire power regulating valve 400 of the liquid level detection system are integrated and installed in the pot body.

[0084] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0086] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0087] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0088] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0089] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A liquid level detection system, characterized in that: The system comprises a controller and a first temperature sensor and a second temperature sensor installed at different lateral positions and / or different longitudinal positions in the pot body; the installation height of the first temperature sensor and the second temperature sensor is not less than a preset liquid level lower limit and does not exceed an initial liquid level in the pot body; the preset liquid level lower limit is set according to cooking requirements; The first temperature sensor and the second temperature sensor are used to detect a first temperature signal and a second temperature signal in the pot body respectively, and transmit them to the controller; The controller is used to calculate the temperature difference between the first temperature signal and the second temperature signal based on the first temperature signal and the second temperature signal, and compare the temperature difference with a preset temperature fluctuation threshold. If the temperature difference is greater than the preset temperature fluctuation threshold, a firepower adjustment instruction and an alarm instruction are output.

2. The system according to claim 1, characterized in that The controller is also used to compare the received first temperature signal and the second temperature signal with the first preset temperature threshold value respectively. If within the preset time, either the first temperature signal or the second temperature signal is less than the first preset temperature signal threshold value, a firepower adjustment instruction and an alarm instruction are output; the first preset temperature threshold value is the signal threshold value when the current liquid level in the pot reaches the preset liquid level lower limit.

3. The system according to claim 2, characterized in that The controller is also used to compare the received first temperature signal and second temperature signal with the second preset temperature signal threshold value respectively. If within the preset time, either the first temperature signal or the second temperature signal is less than the second preset temperature signal threshold value and greater than or equal to the first preset temperature signal threshold value, a reminder signal is output. The second preset temperature signal threshold value is the signal threshold value when the first temperature sensor or the second temperature sensor is located below the liquid level in the pot body.

4. The system according to claim 1, characterized in that The first temperature sensor and the second temperature sensor are respectively installed in the pot body through retractable parts.

5. The system according to claim 1, characterized in that When the firepower adjustment instruction is to reduce the firepower value, the controller is also used to obtain the change rate of the first temperature signal and the second temperature signal. If the change rate of any temperature signal is greater than the preset change rate, a fire-off instruction and a second alarm instruction are output. The alarm level of the second alarm instruction is higher than that of the first alarm instruction.

6. A liquid level detection method, characterized in that: The method comprises: Receiving a first temperature signal and a second temperature signal uploaded by a first temperature sensor and a second temperature sensor; the installation height of the first temperature sensor and the second temperature sensor is not less than a preset lower limit of the liquid level and does not exceed an initial liquid level in the pot body; the preset lower limit of the liquid level is set according to cooking requirements; Compare the received first temperature signal and the received second temperature signal with the first preset temperature threshold respectively; If the first temperature signal and the second temperature signal are both not less than the first preset temperature threshold value after the preset time has passed, then calculating the temperature difference between the first temperature signal and the second temperature signal; comparing the temperature difference with a preset temperature fluctuation threshold; If it is greater than the preset temperature fluctuation threshold, a firepower adjustment instruction and an alarm instruction are output; the first preset temperature threshold is the signal threshold when the current liquid level in the pot reaches the preset liquid level lower limit.

7. The method according to claim 6, characterized in that The method further comprises: If within a preset time, either the first temperature signal or the second temperature signal is less than a first preset temperature signal threshold, a firepower adjustment instruction and an alarm instruction are output.

8. The method according to claim 7, characterized in that The method further comprises: Comparing the received first temperature signal and the received second temperature signal with a second preset temperature signal threshold value respectively; If within the preset time, either the first temperature signal or the second temperature signal is less than the second preset temperature signal threshold and greater than or equal to the first preset temperature signal threshold, a reminder signal is output. The second preset temperature signal threshold is the signal threshold when the first temperature sensor or the second temperature sensor is located below the liquid level in the pot.

9. The method according to claim 7, characterized in that: When the firepower adjustment instruction is to reduce the firepower value, the method further includes: Obtaining the change rates of the first temperature signal and the second temperature signal; If the change rate of any temperature signal is greater than the preset change rate, a flame-off instruction and a second alarm instruction are output, and the alarm level of the second alarm instruction is higher than that of the first alarm instruction.

10. A cookware, characterized in that: The invention comprises a cooker body and the liquid level detection system according to any one of claims 1 to 6, wherein a controller, an alarm and a fire control valve of the liquid level detection system are integrated and installed in the cooker body.

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