CN109419315B - Liquid overflow detection method and device, pot and electromagnetic heating assembly - Google Patents

Liquid overflow detection method and device, pot and electromagnetic heating assembly Download PDF

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Publication number
CN109419315B
CN109419315B CN201810267073.5A CN201810267073A CN109419315B CN 109419315 B CN109419315 B CN 109419315B CN 201810267073 A CN201810267073 A CN 201810267073A CN 109419315 B CN109419315 B CN 109419315B
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liquid
overflow
liquid level
level signal
container
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CN109419315A (en
Inventor
许其养
王志锋
刘传兰
刘经生
马志海
严平
杜放
王龙江
王帅
徐辉任
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • A47J27/002Construction of cooking-vessels; Methods or processes of manufacturing specially adapted for cooking-vessels
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • A47J27/56Preventing boiling over, e.g. of milk
    • A47J27/62Preventing boiling over, e.g. of milk by devices for automatically controlling the heat supply by switching off heaters or for automatically lifting the cooking-vessels
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00Parts, details or accessories of cooking-vessels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24CDOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00Stoves or ranges heated by electric energy
    • F24C7/002Stoves
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284Electromagnetic waves
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/284Electromagnetic waves
    • G01F23/292Light, e.g. infrared or ultraviolet
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/28Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296Acoustic waves

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Food Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Acoustics & Sound (AREA)
  • Cookers (AREA)

Abstract

The invention provides a liquid overflow detection method and device, a cooker and an electromagnetic heating assembly, wherein the liquid overflow detection method comprises the following steps: generating a liquid level signal according to the liquid level state of liquid in a container covered with a cover plate in the heating process of the liquid in the container; and judging whether the liquid is in a state of waiting for overflowing according to the variation trend of the liquid level signal. The invention can accurately and reliably detect the liquid overflow while ensuring that the liquid in the pot is cooked thoroughly, thereby effectively preventing the liquid in the pot from overflowing.

Description

Liquid overflow detection method and device, pot and electromagnetic heating assembly
Technical Field
The invention relates to the technical field of kitchen appliances, in particular to a liquid overflow detection method and device, a cooker and an electromagnetic heating assembly.
Background
With the rapid development of socioeconomic and scientific technologies, time is the most valuable resource for people, and people need to pay for a certain time when cooking as a necessary life base which is not available for people, so that the cooking efficiency becomes the focus of people's needs and concerns, especially for liquid foods such as porridge or soup. The high power characteristic of the induction cooker makes the induction cooker a preferred device for cooking porridge or soup. However, although the process of cooking porridge or soup with an electromagnetic oven is relatively fast, the soup can be boiled within several minutes to more than ten minutes or twenty minutes, and in the whole process of cooking porridge or soup, a user needs to often go to the electromagnetic oven to see whether the soup is boiled or not, and if the soup is not boiled, the user continues to boil the soup; if the soup is boiled, the power of the electromagnetic oven is manually reduced to enable the electromagnetic oven to stew the soup or porridge with lower power and avoid overflowing. Therefore, the user is bound to be wasted and troubled by great time cost, and the user cannot be concentrated on other things.
At present, temperature sensing devices are already arranged in the electromagnetic ovens on the market, but because the temperature sensing devices are only limited in the contents of the electromagnetic ovens, the overflow of liquid in a pot arranged on the electromagnetic ovens cannot be accurately prevented, only rough temperature control can be performed, but the rough temperature control still cannot ensure that the liquid in the pot cannot overflow when a user is not in the pot, and the safety risk that the electromagnetic ovens are improperly used exists.
Therefore, how to design a method for accurately detecting the overflow of the liquid while ensuring that the liquid in the pot is cooked is a problem to be solved urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a liquid overflow detection method and device, a pot and an electromagnetic heating assembly, which can accurately and reliably detect liquid overflow while ensuring that the liquid in the pot is cooked thoroughly, and further can effectively prevent the liquid in the pot from overflowing.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a liquid overflow detection method, including:
generating a liquid level signal according to the liquid level state of liquid in a container covered with a cover plate in the heating process of the liquid in the container;
and judging whether the liquid is in a state of waiting for overflowing according to the variation trend of the liquid level signal.
Further, a liquid level state is obtained according to the distance from the cover plate to the liquid level in the container by using a sensor arranged on the cover plate, and a liquid level signal is generated according to the liquid level state.
Further, the sensor is an ultrasonic sensor, an infrared distance measuring sensor or a microwave sensor.
Further, the liquid overflow detection method further comprises:
and sending an anti-overflow instruction to a heating device for heating the liquid, so that the heating device changes the heating power of the heating device according to the anti-overflow instruction.
Further, the determining whether the liquid is in a state to be overflowed according to the variation trend of the liquid level signal includes:
generating a liquid level change curve according to the change trend of the liquid level signal;
and judging whether the liquid is in a to-be-overflowed state or not based on the liquid level change curve.
Further, the determining whether the liquid is in a to-be-spilled state based on the liquid level change curve includes:
judging whether the liquid level change curve is matched with an overflow interval in a pre-acquired standard overflow signal curve, wherein the standard overflow signal curve is used for displaying the corresponding relation between the value of a liquid level signal of liquid and time, and the standard overflow signal curve is marked with the overflow interval;
and if so, determining that the liquid enters a to-be-overflowed state.
Further, the overflow interval is an interval range between a first liquid level signal value in the container corresponding to when the liquid bubbles in the heated test liquid first start to overflow and a second liquid level signal value in the container when the liquid bubbles in the liquid first push open the cover plate of the container.
Further, the liquid level variation curve is a curve obtained according to the liquid level signal from the identification starting time point to the current time point.
Further, the identification starting time point is a time point when heating is started, or a time point after a second time period elapses since heating is started, or a time point when the liquid level signal satisfies the identification starting condition.
In a second aspect, the present invention provides a liquid overflow detecting device, comprising:
the liquid level signal detection module is used for generating a liquid level signal according to the liquid level state of liquid in the container in the heating process of the liquid in the container covered with the cover plate;
and the to-be-overflowed state judging module is used for judging whether the liquid is in the to-be-overflowed state or not according to the variation trend of the liquid level signal.
In a third aspect, the present invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the liquid overflow detection method when executing the program.
In a fourth aspect, the invention provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the liquid overflow detection method.
In a fifth aspect, the present invention provides a pot, comprising a pot body and a pot cover;
the pot cover is provided with the liquid overflow detection device.
In a sixth aspect, the present invention provides an electromagnetic heating assembly comprising: heating device, and, the pan.
Furthermore, a controller and a second wireless transceiver unit which are in communication connection are arranged in the heating device;
the second wireless transceiver unit is in communication connection with the liquid overflow detection device;
the controller is used for receiving an anti-overflow instruction sent by the liquid overflow detection device through the second wireless receiving and sending unit and changing heating power according to the anti-overflow instruction.
Further, the heating device is an induction cooker.
According to the technical scheme, the liquid overflow detection method provided by the invention comprises the following steps: generating a liquid level signal according to the liquid level state of liquid in a container covered with a cover plate in the heating process of the liquid in the container; judging whether the liquid is in a state to be overflowed or not according to the variation trend of the liquid level signal; can be when guaranteeing that liquid is boiled in the pan, accurately and reliably spill over liquid and detect, and then can effectively prevent that the liquid in the pan from spilling over, avoid the electromagnetism stove to use improper safe and have left the trouble, also improved the intelligent degree that uses the electromagnetism stove to cook, and then improved user experience.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a liquid overflow detection method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of liquid overflow detection using a microwave sensor in the liquid overflow detection method of the present invention;
FIG. 3 is a graphical illustration of a standard overflow signal of the present invention;
FIG. 4 is a graphical illustration of an overflow signal identifying an overflow interval in accordance with the present invention;
FIG. 5 is a schematic structural diagram of a liquid overflow detection device according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of an electronic device in a third embodiment of the present invention;
fig. 7 is a schematic structural view of a cooker in a fifth embodiment of the invention;
fig. 8 is a schematic structural view of an electromagnetic heating assembly in a sixth embodiment of the present invention;
wherein, 1-a pot body; 2-pot cover; 3-a controller; 4-a liquid level sensor; 5-a first radio transceiver unit; 6-a heating device; 7-an induction cooker; 71-a heating coil; 72-IGBT drive switch; 73-a microcontroller; 74-second radio.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Aiming at the problems in the prior art, the invention provides a liquid overflow detection method and device, a cooker and an electromagnetic heating assembly. It can be understood that the liquid overflow detection method according to the embodiment of the present invention is applicable to various cookers and heating devices for heating the cookers, wherein the heating devices particularly refer to induction cookers, electric kettles, and the like, and is also applicable to cooking appliances in which the cookers and the heating devices are integrated and disposed in a single body, such as electric woks and the like; when the cooking utensil with the heating function is used for boiling water, cooking soup, cooking porridge and the like, a vessel filled with liquid is placed on the cooking utensil for heating, and the heated liquid comprises water, oil, soup or other liquid substances. The process that the liquid is heated to boiling in the vessel is a process that the liquid is gradually changed to gas, liquid drops which are continuously close to a heating source are vaporized in the heating process of the liquid, formed bubbles rise in water, and the bubbles break and vibrate when rising to the liquid level. Usually, during the heating process of the liquid, a plurality of small liquid drops are vaporized to form small liquid bubbles which rise and break. When the liquid boils, a large number of liquid droplets are vaporized, and large bubbles are formed and rise and break. The formation, rise and rupture of these bubbles all cause liquid level changes, and these liquid level changes have certain measurable law, can obtain through sensor detection to according to the liquid level change generation electric signal of liquid. The liquid overflow detection method provided by the invention can accurately and effectively prevent the liquid in the pot from overflowing while ensuring that the liquid in the pot is cooked, and the judgment on the overflow process is accurate and reliable, so that the safety risk of improper use of the induction cooker is avoided, the intelligent degree of cooking by applying the induction cooker is also improved, and the application safety is improved, and the user experience is improved. The present invention will be explained in detail below by way of first to sixth embodiments.
An embodiment of the present invention provides a specific implementation of a liquid overflow detection method, and referring to fig. 1, the liquid overflow detection method specifically includes the following steps:
step 100: during heating of a liquid in a container covered with a cover plate, a liquid level signal is generated according to a liquid level state in the container.
In step 100, the liquid overflow detection device continuously detects a liquid level signal of the heated liquid in the container covered by the cover plate, and generates a liquid level change curve of the heated liquid according to the liquid level signal. It can be understood that the liquid overflow detection device can obtain the liquid level signal of the heated liquid detected by the liquid level detection device by controlling the liquid level detection device for detecting the liquid level signal of the heated liquid in the container, and in addition, the liquid overflow detection device can also be integrated with a liquid level detection function to directly detect the liquid level signal of the heated liquid in the container.
It can be understood that the container and the heating device described in the present embodiment may refer specifically to a pot and an induction cooker for heating the pot, respectively, and the liquid therein may refer specifically to liquid food such as water, porridge or soup.
Step 200: and judging whether the liquid is in a state of waiting for overflowing according to the variation trend of the liquid level signal.
In step 200, the variation trend of the liquid level signal is obtained according to the liquid level signal from the identification starting time point to the current time point, and the identification starting time point is a time point at which heating starts, or a time point after a second time period elapses since heating starts, or a time point at which the liquid level signal satisfies the identification starting condition. In the above description, the continuous detecting of the liquid level signal of the heated liquid may occur when the heating device is just started and heats the container, or may occur after the heating device is started for a period of time, but the period of time described herein should not exceed the time length for the liquid in the container to start generating liquid bubbles, for example, if the developer knows that the time for starting generating liquid bubbles in the liquid is 3 minutes after the heating device is started according to the actual experimental result, the period of time may be set to be less than 3 minutes, for example, 30 seconds or 1 minute, so as to reduce the work consumption of the executing device of the detecting operation, improve the service life of the executing device, and ensure the accuracy of the detection.
From the above description, it can be known that the liquid overflow detection method provided by the embodiment of the invention can accurately and reliably judge the overflow process while ensuring that the liquid in the pot is cooked, so that the safety risk of improper use of the induction cooker is avoided, the intelligent degree of cooking by using the induction cooker is also improved, and further the user experience is improved.
In one embodiment, the level sensor is used to generate an electrical signal as a level signal from a level state of the liquid, the height value of the liquid level being indicative of the level signal strength. Wherein, the liquid level sensor is an ultrasonic sensor, an infrared distance measuring sensor or a microwave sensor.
In a specific example, the liquid level sensor may be disposed on the lower surface of the pot cover, and the non-liquid level height sensing surface of the liquid level sensor is fixedly connected to the lower surface of the pot cover, so that when the pot cover is placed on the pot body, the liquid level height sensing surface of the liquid level sensor is arranged opposite to the inner part of the pot body, so that the liquid level height sensing surface of the liquid level sensor can directly and accurately acquire the liquid level change in the pot, meanwhile, a hole can be arranged on the lower surface of the pot cover, the liquid level sensor is fixedly arranged in the hole, and the liquid level height sensing surface of the liquid level sensor is arranged at a position close to the hole, in a preferred embodiment, the liquid level height sensing surface of the liquid level sensor can be arranged right above the hole, when the pot cover is placed on the pot body, the liquid level height sensing surface of the liquid level sensor can directly acquire the liquid level change in the pot body through the hole.
In the above description of the ultrasonic sensor, the ultrasonic ranging principle is that the ultrasonic wave is emitted from the ultrasonic wave emitting device based on the time difference when the receiver receives the ultrasonic wave, similar to the radar ranging principle. The ultrasonic transmitter transmits ultrasonic waves to a certain direction, timing is started at the same time of transmitting time, the ultrasonic waves are transmitted in the air and return immediately when encountering an obstacle in the process, and the ultrasonic receiver stops timing immediately when receiving reflected waves. The propagation speed of the ultrasonic wave in the air is 340m/s, and the distance(s) of the transmitting point from the obstacle can be calculated according to the time t recorded by the timer, namely: s is 340 t/2; when the liquid level formed by bubbles in the pot rises to approach the pot cover, the ultrasonic sensor identifies the height of the liquid level at this moment, the soup or porridge in the pot is judged to overflow outwards, and the singlechip for processing the overflow signal sends an overflow signal to the induction cooker through the wireless transceiving module; when an overflow signal is detected in the process of cooking soup or porridge by using the ultrasonic sensor, the heating power of the electromagnetic oven is automatically reduced, and then the food materials in the pot are slowly braised by using slow fire, so that the overflow is avoided. In the description of the infrared ranging sensor above, any substance has infrared rays radiating to the surrounding space as long as its humidity is higher than absolute zero. Its wavelength is between that of visible light and microwave, its wavelength range is approximately in the spectral range of 0.75 μ M-1000 μ M, and the infrared ray, together with visible light, ultraviolet ray, x-ray, y-ray, microwave and radio wave, constitutes the whole wireless continuous electromagnetic spectrum. The distance measurement principle can be basically summarized as measuring the time required by the light to travel to and from the target, and then calculating the distance D through the speed of light c being 299792458m/s and the atmospheric refractive index n. When the liquid level formed by the bubbles in the pot rises to be close to the pot cover, the infrared distance measuring sensor identifies the height of the liquid level at this moment, the soup or porridge in the pot is judged to overflow outwards, and the single chip microcomputer for processing the overflow signal sends an overflow signal to the induction cooker through the wireless transceiving module. When an overflow signal is detected in the process of cooking soup or porridge by using an infrared distance measuring sensor, the heating power of the electromagnetic oven is automatically reduced, and then the food materials in the pot are slowly braised by slow fire, so that overflow is avoided.
In the above description of the microwave sensor, the microwave is an electromagnetic wave having a wavelength of 0.1m to 1 mm. The working principle is as follows: microwave signal is emitted by the microwave emitter in a directional mode, when the microwave signal meets an object to be detected, part of the microwave signal is absorbed by the object to be detected, and part of the microwave signal is reflected. The receiving antenna is used for receiving the microwave signal reflected by the measured object, detecting the electromagnetic parameter of the microwave signal, and processing the electromagnetic parameter by the measuring circuit, so that the microwave detection is realized. The principle of microwave ranging is as shown in fig. 2:
when the liquid level formed by bubbles in the pot rises to approach the pot cover, the microwave distance measuring sensor identifies the height of the liquid level at this moment, the soup or porridge in the pot is judged to overflow outwards, and the singlechip for processing the overflow signal sends an overflow signal to the induction cooker through the wireless transceiving module. When the microwave distance measuring sensor is used for measuring an overflow signal in the process of cooking soup or porridge, the electromagnetic oven automatically reduces the heating power, and then slowly braises the food materials in the pot with slow fire, so that overflow is avoided.
It can be understood that the controller in the liquid overflow detecting device controls the liquid level sensor to continuously detect the liquid level signal of the heated liquid in the container according to the starting signal received from the heating device for heating the container, and generates the liquid level change curve in real time according to the liquid level signal detected by the liquid level sensor, and the liquid level sensor is connected with the controller and arranged on the cover plate.
In one embodiment, if the liquid is determined to be in the overflow state according to the variation trend of the liquid level signal in step 200, step 200 of the liquid overflow detecting method of the present invention further includes the following steps:
step 300: and sending an anti-overflow instruction to a heating device for heating the liquid, so that the heating device changes the heating power of the container according to the anti-overflow instruction.
In step 300, after the liquid overflow detection device determines that the liquid is in the to-be-overflowed state, the liquid overflow detection device first sends the overflow prevention instruction to the heating device, and the heating device receives the overflow prevention instruction and changes the heating power of the heating device on the container according to the overflow prevention instruction, so that the cover plate of the container is not pushed open by the liquid bubbles while the container is continuously heated.
As can be seen from the above description, the liquid overflow detection method provided by the embodiments of the present invention can accurately and effectively prevent the liquid in the pot from overflowing while ensuring that the liquid in the pot is cooked, and provides a simple and portable control manner through the transmission of the communication information, so that the container and the heating device can be used together without affecting their independent use.
In one embodiment, the step 200 of the liquid overflow detection method of the present invention specifically includes the following steps:
step 201: generating a liquid level change curve according to the change trend of the liquid level signal;
step 202: and judging whether the liquid is in a to-be-overflowed state or not based on the liquid level change curve.
It can be understood that, if the container is provided with a pot cover, the liquid level change curve is used for representing the liquid level signal of the liquid in the container in real time in the process that liquid bubbles of the liquid in the container begin to overflow outwards until the pot cover is opened, and the subsequent process that the pot cover falls down and repeated liquid bubbles begin to overflow outwards until the pot cover is opened, the abscissa of the overflow signal curve is the detection time, and the ordinate of the overflow signal curve is the liquid level signal. Referring to fig. 4, in the heating process, the liquid level change curve collected in real time continuously extends along with time, when the liquid level change curve starts to fall to a preset point 1 after reaching the highest point, a first preset condition is met, the boiling of the liquid is determined, if the liquid level change curve continues to be heated, and when the curve continues to fall to a preset point 2, a second preset condition is met, and the liquid is determined to be in a violent boiling state.
Step 202 specifically includes the following:
step 202 a: and judging whether the liquid level change curve is matched with an overflow interval in a pre-acquired standard overflow signal curve, and if so, confirming that the liquid is in a state to be overflowed.
In step 202a, the standard overflow signal curve is used to display a corresponding relationship between a value of a liquid level signal of the liquid and time, and an overflow interval is marked in the standard overflow signal curve, where the overflow interval is an interval range between a first liquid level signal value corresponding to a liquid bubble in the heated test liquid when the liquid bubble first starts to overflow and a second liquid level signal value when the liquid bubble first pushes open the cover plate of the container.
In the above description, the standard overflow signal curve is used to represent the liquid level signal of the liquid in the container in real time during the process that the liquid bubbles of the liquid in the container start to overflow outwards until the pot cover is opened, and the subsequent process that the pot cover falls down and the repeated liquid bubbles start to overflow outwards until the pot cover is opened. That is, as shown in fig. 3, the abscissa of the standard overflow signal curve is the time of detection, the ordinate of the overflow signal curve is the liquid level signal, and in this embodiment, the value of the liquid level signal is the amplitude of the liquid level signal.
In the above description, the liquid overflow detection device may further perform the overflow prevention control according to whether the liquid level variation curve is matched with an overflow interval in the pre-acquired standard overflow signal curve, in a specific manner: and in the same period, respectively determining the similarity between the curve fluctuation condition and/or the curve shape of the liquid level change curve and the curve fluctuation condition and/or the curve shape of the overflow interval of the standard overflow signal curve, and if the similarity between the curve fluctuation condition of the liquid level change curve and the curve fluctuation condition of the overflow interval of the standard overflow signal curve is greater than a preset fluctuation value, and/or if the similarity between the curve shape of the liquid level change curve and the curve shape of the overflow interval of the standard overflow signal curve is greater than a preset shape value, judging that the liquid level change curve is matched with the overflow interval in the standard overflow signal curve which is obtained in advance.
The matching refers to the approximation on the curve shape, and the approximation degree of the curve can be measured through algorithms such as fuzzy calculation and the like. As can be seen from the graph of fig. 4, since the curves in the stages before and after the overflow are greatly different from the curves in the other stages, the curves do not need to be completely or highly consistent when the curve matching is performed, and the conclusion can be reached as long as a certain degree of similarity is achieved. Moreover, such determination of the different degrees of overflow is advantageous for subsequent operations, and more refined warning and control processing can be realized, such as warning when a certain preset condition is satisfied, stopping heating or reducing power when another preset condition is satisfied.
Wherein, the standard overflow signal curve is obtained based on the overflow characteristic of the liquid, and specifically comprises the following steps:
1) the process that water is heated to boiling in the container is a process that liquid gradually changes to gas; in the process of heating water, water drops which are close to a heating source are continuously vaporized, then formed bubbles rise in the water, and the bubbles break up until rising to the water surface, so that water vapor is formed and is emitted to the liquid surface.
2) Usually, in the process of boiling water, making soup or cooking porridge, a plurality of small water drops are vaporized and then form small bubbles to rise and break; in the process that water is gradually boiled, water drops in the container are gradually vaporized to form bubbles which rise and break to form water vapor, and the water vapor is diffused to the surface of the liquid and gathered in the pot.
3) Generally, in the process of boiling water, making soup or cooking porridge, water vapor in a container gradually changes from little to much and finally gathers in the container; in the process, the liquid level value caused by liquid bubbles in the container can also change, and when soup in the container is boiled and steam in the container reaches a certain amount, the pot cover can be pushed open when the amplitude of a liquid level signal in the container reaches a certain limit.
4) When the cover plate of the container is pushed open, bubbles generated by porridge or soup in the container can emerge from the position where the pot cover is lifted open, which is the phenomenon of overflow.
5) According to the principles of 1) to 4), when the cover plate of the container is lifted and bubbles in the pot are about to emerge in the process of boiling water, cooking soup or cooking porridge by using the liquid level sensor, the heating device can be controlled to automatically reduce the heating power, and then the food materials in the container are slowly braised by using slow fire, so that the overflow is avoided.
From the above description, it can be known that the liquid overflow detection method provided by the embodiment of the invention can accurately and effectively prevent the liquid in the pot from overflowing while ensuring that the liquid in the pot is cooked, and the judgment on the overflow process is accurate and reliable, so that the safety risk of improper use of the induction cooker is avoided, the intelligent degree of cooking by using the induction cooker is also improved, and further the user experience is improved.
In an embodiment, the overflow interval in the liquid overflow detection method of the present invention is an interval range between a first liquid level signal value corresponding to when a liquid bubble in the heated liquid first starts to overflow and a second liquid level signal value when the liquid bubble first pushes open the cover plate of the container.
For example, referring to fig. 4, the interval of reference numeral 1 is an interval in which the liquid bubbles are not generated, the interval of reference numeral 2 is an overflow interval, the lower limit value of the overflow interval is a first liquid level signal value corresponding to when the liquid bubbles start to overflow for the first time, the upper limit value of the overflow interval is an interval range between second liquid level signal values when the liquid bubbles open the container cover for the first time, each valley value of the subsequent curve is an amplitude of the liquid level signal corresponding to when the container cover falls, and each peak value is an amplitude of the liquid level signal corresponding to when the container cover is opened again.
As can be seen from the above description, the liquid overflow detection method provided by the embodiment of the present invention provides an accurate data basis for the subsequent anti-overflow control by accurately obtaining the overflow interval in the overflow signal curve, thereby effectively improving the control accuracy and reliability for preventing the liquid in the pot from overflowing.
An embodiment of the present invention provides a specific implementation manner of a liquid overflow detection device capable of implementing all steps in the above liquid overflow detection method, and referring to fig. 5, the liquid overflow detection device specifically includes the following contents:
and the liquid level signal detection module 10 is used for generating a liquid level signal according to the liquid level state in the container in the heating process of the liquid in the container covered with the cover plate.
And the to-be-overflowed state judging module 20 is used for judging whether the liquid is in the to-be-overflowed state according to the change trend of the liquid level signal.
The embodiment of the liquid overflow detection apparatus provided in the present invention may be specifically used for executing the processing procedure of the embodiment of the liquid overflow detection method, and the functions of the embodiment are not described herein again, and reference may be made to the detailed description of the embodiment of the method.
From the above description, it can be known that the liquid overflow detection device provided by the embodiment of the invention can accurately and effectively prevent the liquid in the pot from overflowing while ensuring that the liquid in the pot is cooked, and the judgment on the overflow process is accurate and reliable, so that the safety risk of improper use of the induction cooker is avoided, the intelligent degree of cooking by using the induction cooker is also improved, and further the user experience is improved.
An embodiment of the present invention provides a specific implementation manner of an electronic device capable of implementing all steps in the above liquid overflow detection method, and referring to fig. 6, the electronic device specifically includes the following contents:
a processor (processor)601, a memory (memory)602, a communication Interface (Communications Interface)603, and a bus 604;
the processor 601, the memory 602 and the communication interface 603 complete mutual communication through the bus 604; the communication interface 603 is used for realizing information transmission among related devices such as modeling software, an intelligent manufacturing equipment module library and the like;
the processor 601 is configured to call the computer program in the memory 602, and the processor implements all the steps in the first embodiment when executing the computer program, for example, the processor implements the following steps when executing the computer program:
step 100: during heating of a liquid in a container covered with a cover plate, a liquid level signal is generated according to a liquid level state of the liquid in the container.
Step 200: and judging whether the liquid is in a state of waiting for overflowing according to the variation trend of the liquid level signal.
From the above description, it can be known that the electronic device provided by the embodiment of the invention can accurately and effectively prevent the liquid in the pot from overflowing while ensuring that the liquid in the pot is cooked, and the judgment on the overflowing process is accurate and reliable, so that the safety risk of improper use of the induction cooker is avoided, the intelligent degree of cooking by using the induction cooker is also improved, and further the user experience is improved.
An embodiment four of the present invention provides a computer-readable storage medium capable of implementing all the steps of the liquid overflow detection method, where the computer-readable storage medium stores a computer program, and the computer program implements all the steps of the first embodiment when being executed by a processor, for example, the processor implements the following steps when executing the computer program:
step 100: during heating of a liquid in a container covered with a cover plate, a liquid level signal is generated according to a liquid level state of the liquid in the container.
Step 200: and judging whether the liquid is in a state of waiting for overflowing according to the variation trend of the liquid level signal.
As can be seen from the above description, the computer-readable storage medium provided in the embodiments of the present invention can accurately and effectively prevent the liquid in the pot from overflowing while ensuring that the liquid in the pot is cooked, and the overflow process is accurately and reliably determined, so that the safety risk of improper use of the induction cooker is avoided, the intelligent degree of cooking using the induction cooker is also improved, and further the user experience is improved.
An embodiment of the present invention provides a specific implementation manner of a pot capable of implementing all steps in the liquid overflow detection method, and referring to fig. 7, the specific structure of the pot is as follows:
the cookware includes: the pot comprises a pot body 1 and a pot cover 2, wherein the pot cover 2 is provided with a liquid overflow detection device of the third embodiment, the liquid overflow detection device comprises a controller 3, the liquid overflow detection device comprises the controller 3, and a liquid level sensor 4 and a first wireless transceiving unit 5 which are connected with the controller 3; the first wireless transceiver unit 5 is in communication connection with a heating device 6 for heating the pot body 1.
In this embodiment, the controller 3 may be a single chip microcomputer.
Wherein, the liquid level sensor 4 is an ultrasonic sensor, an infrared distance measuring sensor or a microwave sensor.
In this embodiment, the process of the cookware performing the anti-overflow control is as follows:
1) the controller 3 firstly receives the starting signal of the heating device 6 and controls the liquid level sensor 4 arranged on the pot cover 2 to continuously detect the liquid level signal of the heated liquid in the pot body 1 covered with the pot cover 2.
2) The controller 3 acquires the liquid level signal detected by the liquid level sensor 4 and generates a signal curve of the liquid level signal according to the liquid level signal, wherein the signal curve of the liquid level signal is used for displaying the corresponding relation between the value of the liquid level signal and time, and an overflow interval is marked in the overflow signal curve.
3) The controller 3 receives the liquid level signal of the heated liquid in the pot body 1 covered with the pot cover 2 sent by the liquid level sensor 4.
4) The controller 3 judges whether the liquid level signal is matched with an overflow interval of a standard overflow signal curve or not according to the overflow signal curve; if yes, executing step 5) and returning to step 3), otherwise, directly returning to step 3).
5) The controller 3 sends the anti-overflow instruction to the heating device 6 through the first wireless transceiver 5, so that the heating device 6 changes the heating power of the heating device 6 to the pot body 1 according to the anti-overflow instruction, and the pot cover 2 is not pushed open by liquid bubbles while the pot body 1 is continuously heated.
From the above description, it can be known that the pot provided by the embodiment of the present invention can accurately and effectively prevent the liquid in the pot from overflowing while ensuring that the liquid in the pot is cooked, and the overflow process is accurately and reliably determined, so that the safety risk of improper use of the induction cooker 7 is avoided, the intelligent degree of cooking by using the induction cooker 7 is also improved, and further the user experience is improved.
An embodiment of the present invention provides a specific implementation manner of an electromagnetic heating assembly capable of implementing all steps in the liquid overflow detection method, and referring to fig. 8, a specific structure of the electromagnetic heating assembly is as follows:
the heating assembly includes: the cooker described in the fifth embodiment, and an induction cooker 7 as a heating device 6 of the pot body 1; the induction cooker 7 is internally provided with an IGBT driving switch 72, a microcontroller 73 and a second wireless transceiver unit 74 of a heating coil 71 which are connected in sequence; the second radio transceiver unit 74 is in communication connection with the first radio transceiver unit 5; the microcontroller 73 is configured to receive an anti-overflow instruction sent by the controller 3 through the second wireless transceiver unit 74, and control the IGBT drive switch 72 to change a switching state according to the anti-overflow instruction, so as to change the heating power of the heating coil 71.
In this embodiment, the process of performing the anti-overflow control on the electromagnetic heating assembly is as follows:
1) the controller 3 firstly receives a starting signal of the induction cooker 7 and controls the liquid level sensor 4 arranged on the pot cover 2 to continuously detect a liquid level signal of heated liquid in the pot body 1 covered with the pot cover 2.
2) The controller 3 acquires the liquid level signal detected by the liquid level sensor 4 and generates a liquid level change curve according to the liquid level signal, wherein the liquid level change curve is used for displaying the corresponding relation between the value of the liquid level signal and the time, and an overflow interval is marked in the overflow signal curve.
3) The controller 3 receives the liquid level signal of the heated liquid in the pot body 1 covered with the pot cover 2 sent by the liquid level sensor 4.
4) The controller 3 judges whether the liquid level change curve is matched with an overflow interval of the standard overflow signal curve; if yes, executing step 5) and returning to step 3), otherwise, directly returning to step 3).
5) The controller 3 sends the anti-overflow instruction to the electromagnetic oven 7 through the first wireless transceiver unit 5.
6) The microcontroller 73 in the induction cooker 7 receives the anti-overflow instruction sent by the controller 3 through the second wireless transceiver unit 74.
7) The microcontroller 73 controls the IGBT (Insulated Gate Bipolar Transistor; an insulated gate bipolar transistor) drives a switch to change the switch state, thereby changing the heating power of the heating coil 71 in the induction cooker 7.
The Microcontroller 73 may also be a single chip Microcomputer (MCU).
From the above description, it can be known that the electromagnetic heating assembly provided by the embodiment of the present invention can accurately and effectively prevent the liquid in the pot from overflowing while ensuring that the liquid in the pot is cooked, and the judgment on the overflowing process is accurate and reliable, so that the safety risk of improper use of the induction cooker 7 is avoided, the intelligent degree of cooking by using the induction cooker 7 is also improved, and further the user experience is improved.
For further explaining the scheme, the invention also provides a specific application example of the method for realizing the liquid overflow detection by applying the electromagnetic heating assembly, which specifically comprises the following steps:
the electromagnetic heating assembly includes: the electromagnetic cooker comprises a pot, an electromagnetic oven matched with the pot, a pot cover matched with the pot, an upper signal detection device, a signal processing and control module and a wireless transceiving module, wherein the upper signal detection device, the signal processing and control module and the wireless transceiving module are arranged on the pot cover;
the signal detection device transmits the acquired data to the signal processing and control module for data processing and analysis; then the boiling state is sent to the induction cooker through a wireless transceiving module; the wireless transceiver receives the overflow state sent from the pot cover and transmits the overflow state to the control MCU of the induction cooker, and the control MCU of the induction cooker controls the switching state of the GBT according to the received boiling state, thereby achieving the purpose of controlling the heating power of the heating coil of the induction cooker. Wherein, the wireless transceiver is 433 wireless transceiver module; the signal detection device comprises a liquid level arranged on the pot cover, and the data is transmitted to the signal processing and control module which is a singlechip used for processing overflow signals; the electromagnetic oven is internally provided with: the electromagnetic oven comprises an IGBT tube driving circuit for controlling the heating state of the electromagnetic oven, a boiling state wireless transceiver for receiving the boiling state transmitted from the pot cover and a control MCU, wherein the control MCU of the electromagnetic oven controls the switching state of the GBT according to the received boiling state.
As can be seen from the above description, the single chip microcomputer for processing the liquid level signal in the technical solution of the above application example samples the liquid level signal at intervals to obtain the original data of the liquid level signal, then performs a series of processing on the original data of the liquid level signal, and finally obtains a curve of standard overflow change in the process of boiling water, soup or porridge. When an overflow signal is detected and the liquid level change curve is matched with an overflow interval in the pre-acquired standard overflow signal curve, the singlechip for processing the overflow signal sends a signal that liquid is boiled to the matched induction cooker through the wireless transceiver module. When the induction cooker receives a boiling signal uploaded from the cooker cover through the wireless transceiver module, the control MCU of the induction cooker controls the on-off state of the IGBT according to the received boiling state, so that the purpose of controlling the heating power of the heating coil of the induction cooker is achieved, soup in the cooker is kept below the boiling point under the condition that the temperature of food is not influenced, and the soup is slowly braised.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (13)

1. A liquid overflow detection method, comprising:
generating a liquid level signal according to the liquid level state of liquid in a container covered with a cover plate in the heating process of the liquid in the container;
generating a liquid level change curve according to the change trend of the liquid level signal;
judging whether the liquid level change curve is matched with an overflow interval in a pre-acquired standard overflow signal curve, wherein the standard overflow signal curve is used for displaying the corresponding relation between the value of a liquid level signal of liquid and time, and the standard overflow signal curve is marked with the overflow interval;
if so, determining that the liquid enters a to-be-overflowed state;
the overflow interval is an interval range between a first liquid level signal value in the container corresponding to the first overflow of the liquid bubbles in the heated test liquid and a second liquid level signal value in the container when the liquid bubbles in the liquid first push open the cover plate of the container.
2. The liquid overflow detection method of claim 1, wherein a sensor disposed on the cover plate is used to obtain a liquid level condition based on a distance between the cover plate and a liquid level in the container, and a liquid level signal is generated based on the liquid level condition.
3. The method of claim 2, wherein the sensor is an ultrasonic sensor, an infrared ranging sensor, or a microwave sensor.
4. The liquid overflow detection method of claim 1, further comprising:
and sending an anti-overflow instruction to a heating device for heating the liquid, so that the heating device changes the heating power of the heating device according to the anti-overflow instruction.
5. The method of claim 1, wherein the liquid level variation curve is a curve obtained according to a liquid level signal from an identified starting time point to a current time point.
6. The method of claim 5, wherein the identification start time is a time when heating is started, or a time when a second period of time has elapsed since heating is started, or a time when the level signal satisfies the identification start condition.
7. A liquid overflow detection device, comprising:
the liquid level signal detection module is used for generating a liquid level signal according to the liquid level state of liquid in the container in the heating process of the liquid in the container covered with the cover plate;
and the to-be-overflowed state judging module is used for generating a liquid level change curve according to the change trend of the liquid level signal and judging whether the liquid level change curve is matched with an overflow interval in a pre-acquired standard overflow signal curve, wherein the standard overflow signal curve is used for displaying the corresponding relation between the value of the liquid level signal of the liquid and the time, and the overflow interval is marked in the standard overflow signal curve, wherein the overflow interval is an interval range between a first liquid level signal value in the container corresponding to the first overflow of the liquid bubbles in the heated test liquid and a second liquid level signal value in the container when the liquid bubbles in the liquid push open the cover plate of the container for the first time.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the liquid overflow detection method of any of claims 1 to 6 are implemented when the program is executed by the processor.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the liquid overflow detection method of any one of claims 1 to 6.
10. A cooker is characterized by comprising a cooker body and a cooker cover;
the lid is provided with a liquid overflow detecting device as claimed in claim 7.
11. An electromagnetic heating assembly, comprising: heating device, and a pot as claimed in claim 10.
12. The electromagnetic heating assembly of claim 11, wherein the heating device has a controller and a second wireless transceiver unit communicatively coupled thereto;
the second wireless transceiver unit is in communication connection with the liquid overflow detection device;
the controller is used for receiving an anti-overflow instruction sent by the liquid overflow detection device through the second wireless receiving and sending unit and changing heating power according to the anti-overflow instruction.
13. An electromagnetic heating assembly according to claim 11 or 12, wherein the heating means is an induction cooker.
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