CN117607190A

CN117607190A - Liquid heating container and liquid heating state monitoring device based on fluctuation discrimination

Info

Publication number: CN117607190A
Application number: CN202311281108.8A
Authority: CN
Inventors: 孙滕谌; 康涛; 王凯
Original assignee: Beijing Tashan Technology Co ltd
Current assignee: Beijing Tashan Technology Co ltd
Priority date: 2023-09-28
Filing date: 2023-09-28
Publication date: 2024-02-27

Abstract

The invention relates to a liquid heating state monitoring device based on fluctuation discrimination, which comprises a first electrode unit, a capacitance-digital conversion circuit and a processing module, wherein the capacitance-digital conversion circuit is coupled with the first electrode unit and is used for converting the self capacitance of the first electrode unit into a self capacitance measurement original value; the processing module is coupled to the capacitance-to-digital conversion circuit for outputting a boiling signal of the liquid and/or adjusting the heating power according to a first derivative at a capacitance measurement value, wherein the self-capacitance measurement value is configured as an output value obtained by filtering a self-capacitance measurement original value with a small delay, and the delay time of the small delay filtering is configured to be between 10 and 40 mS. The invention provides a capacitance scheme which can detect liquid which directly overflows without violent fluctuation after boiling and liquid which only violently boils and cannot overflow, and the advantages of simple structure, convenient arrangement, cleaning avoidance and the like of the sensor are achieved by relying on the capacitance detection advantage, and meanwhile, the state of the liquid in which the boiling degree is relatively violent before the liquid does not overflow can be detected.

Description

Liquid heating container and liquid heating state monitoring device based on fluctuation discrimination

Technical Field

The invention relates to liquid heating detection, in particular to a liquid heating container and a liquid heating state monitoring device based on fluctuation discrimination.

Background

In order to remove the harmful components such as saponin and antitrypsin contained in the soybean milk, the soybean milk machine needs to repeatedly cook the soybean milk, so that the detection requirements on the boiling of the soybean milk and the anti-overflow of the soybean milk are very strong. Other liquid heating containers such as medicine decocting machines, tea boiling machines and the like have detection requirements for liquid overflow prevention.

At present, the anti-overflow alarm detection in the soymilk machine mostly adopts a resistance type measurement mode, conductive metal is required to be introduced into a container, the resistance between the conductive metal and the container wall is measured, namely, whether the resistance value caused by the fact that liquid contacts the conductive metal is different or not is measured, and finally, whether the liquid overflows or not is judged by comparing the change of the resistance value.

The disadvantages of the resistive scheme are:

A. the sensor needs to be inserted into the container and finally can realize the power-off alarm function after being contacted with liquid, special structural parts are required to be installed and fixed, so that the sensor has a sanitary dead angle and is inconvenient to clean, and the sensor is more sensitive to the sanitary dead angle in household appliances which are difficult to clean due to repeated boiling of the soymilk machine;

B. different liquid food materials have different electric conductivity, and overflows are mostly foam-shaped, so that the electric conductivity is extremely uncertain, and the alarm is not easily caused or is given after overflows;

C. the power failure alarm is not in time at the lower water level: the resistance sensor is a single electrode, has a fixed position, is difficult to realize an overflow power-off alarming function when in a lower water level, belongs to an alarm when the resistance sensor contacts with the electrode after overflowing, and can overflow a container due to thermal inertia even if power is off;

D. the sensor die is costly.

Patent CN201811314598.6 discloses a heating control method for a liquid heating container, in which a capacitance detection mode is adopted, by acquiring a first capacitance sensed by an upper capacitance sensing piece and a second capacitance sensed by a lower capacitance sensing piece when the liquid heating container is heated, after the capacitance change rate of the lower capacitance sensing piece is monitored to be reduced, if the change rate of the upper capacitance sensing piece is found to be reduced, heating of the liquid heating container is stopped, so that overflow monitoring is realized. The scheme is suitable for detecting liquid which directly overflows without severe fluctuation after boiling, such as soybean milk, foam is generated after the type of liquid is heated, and the liquid level rises relatively stably and rapidly due to the existence of surface foam when the liquid is boiled. However, it is impossible to detect the situation that the liquid is boiled vigorously and does not overflow, for example, water, the liquid level fluctuates vigorously after boiling, but does not overflow like soybean milk.

Patent CN202110969026.7 also adopts a capacitance detection mode, and discloses that if the absolute value of the difference between the capacitance value at the current time and the average value of the capacitance values at two times before the current time exceeds a predetermined threshold, i.e., |capa- (capa1+capa2)/2|gtoreq.x, then the current capacitance value is considered to generate a fluctuation change once, and the total number of the fluctuation times of the capacitance is added with 1, n=n+1; and if the total number of the capacitor fluctuation is larger than or equal to a preset threshold value, namely N is larger than or equal to Y, judging that the temperature reaches the boiling point. The scheme needs to collect fluctuation change within a certain time, and for liquids like soymilk, the scheme cannot timely prevent the overflow of the liquid because the overflow speed of the liquid after the soymilk is boiled is extremely high.

Patent cn201811315361.X discloses that the difference between the capacitance of the lower electrode and the capacitance of the upper electrode is less than a threshold value, is also suitable for detecting liquids such as soymilk, and has a defect of detection accuracy.

Disclosure of Invention

The invention aims to provide a capacitance scheme which can detect liquid which directly overflows without violent fluctuation after boiling and liquid which only violently boils and cannot overflow, and the capacitance scheme is relied on to achieve the advantages of simple structure, convenience in arrangement, cleaning avoidance and the like of a sensor, and meanwhile, the state when the boiling degree is relatively violent before the liquid does not overflow can be detected.

To this end, a liquid heating state monitoring device based on fluctuation discrimination is provided, the liquid being configured to be capable of being carried by a liquid heating container; the liquid heating state monitoring device comprises a first electrode unit, a capacitance-digital conversion circuit and a processing module; the first electrode unit is used for capacitively sensing the liquid level of the liquid, is arranged on the liquid heating container and is insulated from the liquid; the capacitance-to-digital conversion circuit is coupled with the first electrode unit and is used for converting the self capacitance of the first electrode unit into a self capacitance measurement original value; the processing module is coupled to the capacitance-to-digital conversion circuit and is configured to output a boiling signal of the liquid and/or adjust the heating power according to a first derivative of a capacitance measurement value, wherein the self-capacitance measurement value is configured to be an output value obtained by filtering a self-capacitance measurement original value by a small delay, and a delay time length of the small delay filtering is configured to be between 10 mS and 40 mS.

For liquids, such as soymilk or water, the liquid level fluctuates during boiling, and for capacitance measurement systems we find that such fluctuations will cause the self capacitance of the electrodes to fluctuate. Unlike the violent fluctuation after boiling of water, for the liquid which directly overflows after boiling without violent fluctuation, the liquid overflows after boiling, but once the liquid overflows, the speed is extremely high, even if the power is cut off, the overflow can still last for a few seconds by thermal inertia, so the timeliness of detection is particularly important.

In addition, based on a capacitance digital conversion circuit (CDC), such as ADI7142 and ADI7147, a delta-sigma modulation mode is adopted to directly convert a measured capacitance value into a digital value by a method of charging and discharging the measured capacitance for a plurality of times and comparing the measured capacitance value with a reference capacitance (see U.S. Pat. No. 5,134,401), so that the immunity characteristic to stray capacitance is obtained, the precision performance is improved, the measurement sensitivity to capacitance is improved to 1ff level, and the timeliness design of system detection is facilitated.

Moreover, by means of capacitance measurement, the electrode arrangement is very simple, the sensor does not need a special structure, the circuit is simple, the power consumption is low, the cost is low, and the electrode and the liquid are arranged in an insulating way, so that the need of maintenance and cleaning is avoided.

In the foregoing, the small delay filtering may be implemented by using algorithms such as a sliding average value of the number of small points and/or a sliding median value of the number of small points, a first-order filtering value of a small coefficient, and the like, which are not described herein. The capacitance measurement raw value described above is configured as a CDC capacitance conversion digital value without any filtering.

In the present invention, the strategy for adjusting the heating power after boiling and/or overflowing, such as suspending heating/reducing power when an event occurs, is not developed.

The processing module is configured as a specific implementation further comprising: if the absolute value of the first derivative of the capacitance measurement is greater than or equal to a defined fluctuation threshold, a boiling signal of the liquid is output and/or the heating power is adjusted.

In the above-described scheme, when the detection object is a liquid (e.g., water) whose liquid surface fluctuates drastically when heated boiling, the boiling fluctuation characteristic of this type of liquid is considered, since it is unlikely to overflow although fluctuating drastically, as an improvement scheme, the fluctuation threshold is configured to be between 8ff and 12ff to promote the detection reliability. Wherein the sharp fluctuation is configured such that the peak-to-peak value of the liquid level fluctuation is between 16ff and 32 ff.

When the detection object is liquid with slight fluctuation of the liquid level during heated boiling, the detection sensitivity and the reliability are required to be balanced due to the characteristic of extremely high overflow speed, and the fluctuation threshold value of the liquid is configured to be 8ff-12 ff. Wherein the slight fluctuation is configured such that the peak-to-peak value of the liquid level fluctuation is between 0 and 4 ff.

As an improvement, based on the characteristic that this type of liquid overflows extremely fast, a small probability of missing detection in the wave mode is caused, and the processing module is configured to execute a difference detection after the wave detection as a supplement to missing detection, and includes: outputting an overflow early warning signal of the liquid and/or adjusting heating power according to the separation degree between the self-capacitance measured value and the dynamic capacitance baseline value of the first electrode unit, wherein the dynamic capacitance baseline value is configured as an output value of the self-capacitance measured original value after delay filtering. In the scheme, based on the relatively stable and rapid rising of the boiling liquid level of the liquid, for example, the self-capacitance value is increased along with the rising of the temperature of the soybean milk in the heating process of the soybean milk; the self-capacitance value increases fast after boiling and fluctuates violently, when overflows, the self-capacitance value increases at extremely high speed, the self-capacitance value decreases rapidly along with the breaking of overflowed foam after power failure, the overflow early warning and/or response can be carried out through the separation degree between the self-capacitance measurement value and the dynamic capacitance baseline value, furthermore, the fluctuation measurement mode is supplemented, the capacitance measurement system is more reliable, and meanwhile, the detection is more accurate by means of the comparison of the capacitance measurement value and the dynamic capacitance baseline value. In the above solution, the delay duration of the large delay filtering is configured to be between 2560 and 10240mS, and may be implemented by using algorithms such as a large coefficient first order filtering value, a large point sliding average value, and/or a large point median value, which are not described herein. Specifically, if the difference between the self-capacitance measurement value and the dynamic capacitance baseline value is greater than or equal to a prescribed differential threshold value, an overflow warning signal of the liquid is output and/or heating power is adjusted.

Preferably, in order to further improve the accuracy and also to satisfy the sensitivity requirement, the ratio of the delay time length of the small delay filter to the delay time length of the large delay filter in the above scheme is configured to be 1-256.

Considering that the amount of liquid to be heated is different each time, the minimum amount and the maximum amount need to be set, the soymilk machine prescribes the minimum amount to be 600mL and the maximum amount to be 1200mL, and the soymilk belongs to liquid easy to overflow, so the minimum amount of the soymilk is 600mL and the maximum amount is 1200mL. As another improvement, the invention adopts a multi-section self-capacitance sensor, specifically configures at least two first electrode units, and each first electrode unit is arranged along the height direction of the liquid heating container so as to form a multi-layer structure; the capacitance-to-digital conversion circuit is coupled with each first electrode unit through a switch array; the processing module is coupled to the switch array. The multi-section electrode pairs are vertically arranged, so that the liquid level measuring device can be used for measuring in a grading manner, has a liquid level detecting function in a range from minimum water quantity to maximum water quantity, can be used for measuring an initial water level, is convenient for a machine to automatically select a boiling strategy, and can be used for judging boiling and overflowing of liquid in a difference value and fluctuation quantity mode. The purpose of this design is to adapt to different amounts of liquid, because the lower 4-stage self-capacitance will be submerged by liquid when the corresponding maximum amount is reached, and the submerged self-capacitance will not change significantly due to boiling or overflow, that is, the difference and fluctuation amount discrimination can only be performed for the upper 1 st or 2 nd stage self-capacitance when the corresponding maximum amount of liquid is heated. Similarly, when the minimum water quantity is corresponding, the method can only judge the initial difference value and the fluctuation value of the self-capacitance of the 3 rd section or the 4 th section.

In the invention, further, based on the boiling detection result, the heating container can be configured to early warn boiling overflow in advance, and the optimal heating power is intelligently selected according to the liquid level. The invention can also have the function of liquid level detection, thereby giving an alarm for too low or too high water level.

Further, the first electrode unit is configured to include at least one electrode pair, and the projection areas of two electrodes in the electrode pair relative to the liquid are asymmetrically arranged; the capacitance-digital conversion circuit is used for acquiring the self capacitance of two electrodes in each electrode pair and/or the mutual capacitance between two adjacent electrodes, and the processing module is used for acquiring the liquid level information of the liquid according to the self capacitance of two electrodes in each electrode pair and/or the mutual capacitance between two adjacent electrodes. In this further development, the asymmetric electrode pairs are used in a plurality of segments, so that the relative height h2 of the liquid level in the segment range can be precisely calculated by the ratio of the self capacitances of the two electrodes of each segment of the asymmetric electrode pair; the mutual capacitance of the electrodes between two adjacent sections (layers) is used for determining which section the liquid level is positioned in, and the midpoint height of a gap between the section and the adjacent section completely submerged by the liquid level is used as the starting position h1 of the section, so that accurate and high-precision continuous liquid level detection can be obtained through the liquid level height h=h1+h2. The electrode pairs with asymmetric areas, such as trapezoid or triangle electrodes, are arranged in each section, and the design intention is that: on the one hand, mutual capacitance is two electrodes, one for input excitation and one for reception, so that the calculation of mutual capacitance is less affected by environmental changes, in other words, this part is relatively accurate; on the other hand, by the segmentation, the asymmetric electrode pairs are independently provided for each segment, or the pair triangle is taken as an example, and at this time, the areas of the triangle electrodes on the left and right sides in the pair triangle are reduced, so that the degree of difference of the influence of the environmental fluctuation on the two is also reduced, and further, the precision is improved. And the calculated liquid level is dynamically corrected or calibrated by utilizing the multi-section separation gap, so that the precision of liquid level detection can be further improved.

Regarding the above-described method of calculating h2 by the ratio of the self capacitances of the two electrodes of the asymmetric-area electrode pair of each segment, it may be:

for example, the right triangle electrode (tip upwards) is sensor 0, the initial capacitance change is faster along with the water level increase, and the final capacitance change is slower; the left triangular electrode (tip downward) is sensor 1, and the initial change is slower and the final change is faster along with the increase of the water level. The continuous water level calculation method is as follows:

1) Firstly, recording initial values of two triangular electrode capacitances at the 0 water level;

2) The increment of the capacitance of the two triangular electrodes along with the change of the level is calculated, the increment of the left triangular electrode (with the tip part facing downwards) sensor 1 is divided by the increment of the right triangular electrode (with the tip part facing upwards) sensor 0, so that a value of 0-100% can be obtained, 100% means that the two triangular electrodes are submerged by the water level, and the ratio is 1, namely 100% because the areas of the two electrodes are equal.

For most liquid heating vessels, high water level heating is of greater concern than low water level heating due to concerns about boiling overflow, and based thereon, more preferably, at least one layer of second electrode units arranged in the height direction of the vessel and below the first electrode units, the second electrode units being configured to contain at least one electrode. In the scheme, the low water level can be subjected to fuzzy distinction by adopting one electrode, and the detection precision is more accurate due to the existence of the asymmetric electrode at the upper part when the water level is high, so that the simplification of the electrode structure and the reduction of the capacitance channel of the CDC are realized under the condition of meeting the detection performance requirement of the liquid heating container, and the further optimization of the cost is achieved. Furthermore, the width of the electrode in the first electrode unit is configured to be larger than that of the electrode in the second electrode unit by taking the height direction of the liquid storage container as the width direction of the electrode, on one hand, the width reduction of the second electrode unit is beneficial to the improvement of the detection precision of the low water level, on the other hand, more space, especially space in the height direction, can be made for the arrangement of the upper part of the electrode, and the electrode is arranged in an asymmetric electrode pair matched with the upper part of the electrode, so that the wide-range detection of the high water level can be achieved, and the high precision is ensured.

The liquid heating container comprises the liquid heating state monitoring device.

The liquid heating vessel of the present invention may be any vessel capable of heating a liquid, such as a soymilk machine, a tea boiler, a drug-decocting device, a water-boiling kettle, or the like. In the case of a liquid heating container with a handle, such as a soymilk machine, as another improvement scheme, the electrode sensor can be arranged in the handle of the container, cling to the wall of the container, and allow a small amount of installation clearance, so that a user cannot see the existence of the sensor, and maintenance and cleaning are avoided through non-contact.

Drawings

FIG. 1 shows a schematic diagram of a liquid level measurement sensor composition;

FIG. 2 is a schematic diagram showing the principle of mutual capacitance detection of a first electrode unit;

FIG. 3 is a schematic diagram showing the principle of mutual capacitance detection between detection electrodes;

FIG. 4 shows a schematic illustration of the addition of a second electrode unit;

fig. 5 shows a schematic view of the liquid level between the sensing electrodes 411 and 412;

FIG. 6 shows a schematic graph of the first derivative of capacitance data;

fig. 7 shows a schematic diagram of a ripple curve corresponding to an anti-overflow signal.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

As shown in fig. 1, a liquid level measuring sensor comprises a capacitance-to-digital conversion circuit 100, a switch array 200, a processing module 300, and 5 layers of first electrode units 400 which are arranged along the height direction of a liquid storage container and are insulated from liquid in the container; the first electrode unit 400 is composed of an electrode pair 410, 420; the capacitance-to-digital conversion circuit 100 couples the individual electrodes through a switch array 200; the processing module 300 is coupled to the capacitive digital conversion circuit 100 and the switch array 200, respectively.

K1-K10 in the switch array is closed, electrode pairs in each layer of first electrode units are combined, the equivalent schematic diagram is shown in figure 2, mutual capacitance between two adjacent layers of combined first electrode units 400 is respectively collected, the processing module 300 can determine that the liquid level is in the electrode unit combined by the electrodes 411 and 421 by analyzing the mutual capacitance data acquired by the capacitance-to-digital conversion module 100, and uses the midpoint height of the gap between the electrode unit combined by the electrodes 411 and 421 and the electrode unit combined by the electrodes 412 and 422 completely submerged by the liquid level as the starting position h1 of the segment.

As shown in fig. 3, the analog switches K3, K4 are closed, the self-capacitance of the electrodes 411 and 421 is detected, the initial capacitance change of the electrode 421 is faster with the increase of the water level, and the final capacitance change is slower; the electrode 411 changes slowly in the initial stage and changes rapidly in the final stage as the water level increases. The processing module 300 calculates the increment of the capacitance of the electrodes 411 and 421 along with the change of the level, divides the increment of the electrode 411 by the increment of the electrode 421 to obtain a value of 0-100%, and 100% indicates that both the electrodes 411 and 421 are submerged by the water level, so that the relative height h2 of the liquid level in the range of the electrodes 411 and 421 can be accurately calculated.

Therefore, accurate and high-precision liquid level data can be obtained by the liquid level height h=h1+h2.

As another improvement, as shown in fig. 4, the liquid level measuring sensor is further configured with a second electrode unit 500 arranged along the height direction of the liquid storage container and below the first electrode unit 400, and at the time of low water level, the electrodes 510, 520, 530 can perform sectional judgment on the water level.

As shown in fig. 5 and 6, the liquid level is between the sensing electrodes 411 and 412, the sensing electrodes 412, 413 and 414 are submerged, and the capacitance data is stable. The analog switches K1, K2, K3, K4 are closed, and the processing module 300 performs a first derivative operation on the capacitance data collected by the capacitance-to-digital conversion module 100 and obtained by combining the sensing electrodes 410 and 420 and combining the sensing electrodes 411 and 421, as shown in fig. 6. As can be seen from the data in the figure, in the period t1, the liquid level is in a fluctuation state of boiling, and the page does not rapidly fluctuate, and a boiling signal is output. The curve is rapidly increased in the t2 time period, so that the rapid rise of the liquid level can be judged, and the anti-overflow signal is required to be timely output in the test. During the time period t3, the processing module 300 receives the anti-overflow signal, and stops heating, so that the liquid level drops slowly and the curve drops because of the residual heat of the heating device. As shown in fig. 7, by setting the threshold value X of the fluctuation amount, an overflow prevention alarm signal is output immediately upon detecting that the data fluctuation is greater than the threshold value X.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. Liquid heating state monitoring devices based on fluctuation is distinguished, its characterized in that:

the liquid is configured to be carried by a liquid heating vessel;

the liquid heating state monitoring device comprises a first electrode unit, a capacitance-digital conversion circuit and a processing module;

the first electrode unit is used for capacitively sensing the liquid level of the liquid, is arranged on the liquid heating container and is insulated from the liquid;

the capacitance-to-digital conversion circuit is coupled with the first electrode unit and is used for converting the self capacitance of the first electrode unit into a self capacitance measurement original value;

the processing module is coupled to the capacitance-to-digital conversion circuit and is configured to output a boiling signal of the liquid and/or adjust the heating power according to a first derivative of a capacitance measurement value, wherein the self-capacitance measurement value is configured to be an output value obtained by filtering a self-capacitance measurement original value by a small delay, and a delay time length of the small delay filtering is configured to be between 10 mS and 40 mS.

2. The liquid heating status monitoring device of claim 1, wherein the processing module is configured to further comprise:

outputting a boiling signal of the liquid and/or adjusting the heating power if the absolute value of the first derivative of the capacitance measurement is greater than or equal to a prescribed fluctuation threshold.

3. The liquid heating state monitoring device according to claim 2, wherein:

the liquid is configured to generate severe fluctuation of the liquid level when heated and boiled, and the severe fluctuation is configured to be that the peak-to-peak value of the fluctuation of the liquid level is between 16ff and 32 ff;

the fluctuation threshold is configured to be between 20ff and 24 ff.

4. The liquid heating state monitoring device according to claim 2, wherein:

the liquid is configured to produce a slight fluctuation in the liquid surface upon heated boiling, the slight fluctuation being configured such that the peak-to-peak value of the liquid surface fluctuation is between 4ff and 8 ff.

5. The liquid heating state monitoring device according to claim 4, wherein: the ripple threshold is configured to be between 8ff and 12 ff.

6. The liquid heating status monitoring device according to claim 4 or 5, wherein the processing module further comprises:

outputting an overflow early warning signal of the liquid and/or adjusting the heating power according to the separation degree between the self-capacitance measured value and the dynamic capacitance baseline value of the first electrode unit, wherein the dynamic capacitance baseline value is configured as an output value obtained by filtering the self-capacitance measured original value with large delay.

7. The liquid heating status monitoring device of claim 6, wherein the processing module further comprises:

and if the difference value between the self-capacitance measured value and the dynamic capacitance baseline value is greater than or equal to a specified differential threshold value, outputting an overflow early warning signal of the liquid and/or adjusting the heating power.

8. The liquid heating state monitoring device according to claim 6, wherein:

the ratio of the delay duration of the small delay filter to the delay duration of the large delay filter is configured to be 1:256.

9. The liquid heating state monitoring device according to claim 1, wherein:

the first electrode units are configured to have at least two, and each of the first electrode units is arranged along the height direction of the liquid heating container so as to form a multilayer structure;

the capacitance-to-digital conversion circuit is coupled with each first electrode unit through a switch array;

the processing module is coupled to the switch array.

10. The liquid heating state monitoring device according to claim 9, wherein:

the first electrode unit is configured to comprise at least one electrode pair, and the projection areas of two electrodes in the electrode pair relative to the liquid are asymmetrically arranged;

the capacitance-to-digital conversion circuit is used for acquiring the self capacitance of two electrodes in each electrode pair and/or the mutual capacitance between two adjacent electrodes,

the processing module obtains the liquid level information of the liquid according to the self capacitance of two electrodes in each electrode pair and/or the mutual capacitance between two adjacent electrodes.

11. The liquid heating state monitoring device according to claim 9, wherein:

the device also comprises at least one layer of second electrode units which are arranged along the height direction of the container and are positioned below the first electrode units;

the second electrode unit is configured to include at least one electrode.

12. The liquid heating state monitoring device according to claim 11, wherein:

taking the height direction of the container as the width direction of the electrode;

the electrode width in the first electrode unit is configured to be greater than the electrode width in the second electrode unit.

13. A liquid heating vessel, characterized by: a liquid heating state monitoring device comprising any one of claims 1 to 12.