CN108309041B - Electric cooker, anti-overflow control device and anti-overflow control method thereof - Google Patents

Electric cooker, anti-overflow control device and anti-overflow control method thereof Download PDF

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Publication number
CN108309041B
CN108309041B CN201710052029.8A CN201710052029A CN108309041B CN 108309041 B CN108309041 B CN 108309041B CN 201710052029 A CN201710052029 A CN 201710052029A CN 108309041 B CN108309041 B CN 108309041B
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CN
China
Prior art keywords
electric cooker
heating
time
power regulation
foam
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Application number
CN201710052029.8A
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Chinese (zh)
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CN108309041A (en
Inventor
刘文华
雷俊
瞿月红
杜放
王云峰
黄庶锋
艾永东
黄韦铭
Original Assignee
佛山市顺德区美的电热电器制造有限公司
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Priority to CN201710052029.8A priority Critical patent/CN108309041B/en
Publication of CN108309041A publication Critical patent/CN108309041A/en
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Publication of CN108309041B publication Critical patent/CN108309041B/en

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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
    • A47J27/56Preventing boiling over, e.g. of milk
    • 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
    • A47J36/24Warming devices
    • A47J36/2483Warming devices with electrical heating means
    • 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
    • A47J2201/00Devices having a modular construction

Abstract

The invention discloses an electric cooker, an anti-overflow control device and an anti-overflow control method thereof, wherein the anti-overflow control method comprises the following steps: after the electric cooker enters a boiling stage, controlling the electric cooker to heat according to a preset power regulation ratio, and detecting steam foam generated during cooking of the electric cooker; if steam foam is detected, acquiring the heating time of the electric cooker in the current power regulation period, and calculating the time T for stopping heating after the electric cooker overflows according to the heating time of the electric cooker in the current power regulation period and a preset power regulation ratio; the electric cooker is controlled to stop heating, when the heating stop time of the electric cooker reaches T, the electric cooker is controlled to be heated by the preset power regulation ratio, so that the heating stop time when the electric cooker is about to overflow can be calculated based on the heating power regulation ratio of the electric cooker, the overflow phenomenon of the electric cooker can be prevented, and the sufficient boiling of the electric cooker during cooking food can be ensured.

Description

Electric cooker, anti-overflow control device and anti-overflow control method thereof
Technical Field
The invention relates to the technical field of cooking appliances, in particular to an anti-overflow control method of an electric cooker, an anti-overflow control device of the electric cooker and the electric cooker.
Background
Electric cookers such as electric cookers in the related art generally adopt two modes during anti-overflow control, one mode is that the electric cooker is controlled to heat by adopting small power, so that the electric cooker is ensured not to overflow in a boiling stage, but insufficient boiling can be caused, and the taste of cooked food is influenced; the other method is to detect whether the electric cooker overflows in the boiling stage by assembling an anti-overflow detection device, and when detecting that the electric cooker is about to overflow, the electric cooker is controlled to stop heating, the time for stopping heating every time is fixed and unchanged, and the insufficient boiling is caused to influence the taste of cooked food.
Therefore, the anti-overflow control method in the related art needs to be improved.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, an object of the present invention is to provide an anti-overflow control method for an electric cooking device, which can calculate the heating stop time of the electric cooking device when the electric cooking device is about to overflow based on the heating power regulation ratio of the electric cooking device, thereby not only preventing the electric cooking device from overflowing, but also ensuring the electric cooking device to be fully boiled when cooking food.
Another object of the present invention is to provide an anti-overflow control device of an electric cooker. It is yet another object of the present invention to provide an electric cooker.
In order to achieve the above object, an embodiment of the present invention provides an anti-overflow control method for an electric cooking device, including the following steps: after the electric cooker enters a boiling stage, controlling the electric cooker to heat according to a preset power regulation ratio, and detecting steam foam generated during cooking of the electric cooker through a foam detection device, wherein the preset power regulation ratio is the ratio of the heating time of the electric cooker in a power regulation period to the time of the power regulation period; if the steam foam is detected, acquiring the heating time of the electric cooker in the current power regulation period, and calculating the time T for the electric cooker to stop heating according to the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio; and controlling the electric cooker to stop heating, and when the heating stop time of the electric cooker reaches T, resuming to control the electric cooker to perform heating work at the preset power regulation ratio.
According to the anti-overflow control method of the electric cooker provided by the embodiment of the invention, after the electric cooker enters the boiling stage, if the foam detection device detects the steam foam generated during cooking of the electric cooker, the heating time of the electric cooker in the current power regulation period is obtained, the time T for stopping heating of the electric cooker is calculated according to the relation between the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio, the electric cooker is controlled to stop heating, and the electric cooker is controlled to resume to control the electric cooker to perform heating work according to the preset power regulation ratio until the heating stopping time of the electric cooker reaches T, so that the heating stopping time when the electric cooker is about to overflow is calculated based on the heating power regulation ratio of the electric cooker, the overflow phenomenon of the electric cooker can be prevented, the full boiling of the electric cooker during cooking of food can be ensured, the mouthfeel of food cooked by the electric cooker is ensured, and the life quality of a user is improved.
In some embodiments of the invention, when the time T that the electric cooker needs to stop heating is calculated according to the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio, where when N is greater than or equal to M, T is a-M, where a is a first preset constant, N is the heating time of the electric cooker in the current power regulation period, and M is the heating time corresponding to the preset power regulation ratio; and when N is less than M, T is b-N, wherein b is a second preset constant.
In some embodiments of the invention, when the time T for stopping heating of the electric cooker is calculated according to the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio, wherein when N is larger than or equal to M, T is M0-N, wherein M0The time is the time of one power regulation period, N is the heating time of the electric cooker in the current power regulation period, and M is the heating time corresponding to the preset power regulation ratio; and when N is less than M, T is b-N, wherein b is a second preset constant.
Specifically, in one embodiment of the present invention, wherein M < a < 2M0,M<b<2M0,M0Is the time of one power cycle.
According to one embodiment of the present invention, the foam detection means is provided in an upper cover of the electric cooker.
In order to achieve the above object, an anti-overflow control device for an electric cooking device according to another embodiment of the present invention includes a detection module and a main control module, wherein after the electric cooking device enters a boiling stage, the main control module controls the electric cooking device to perform heating operation at a preset power regulation ratio, and the detection module detects steam bubbles generated during cooking of the electric cooking device through a bubble detection device to generate a bubble detection signal, wherein the preset power regulation ratio is a ratio of a heating time of the electric cooking device in a power regulation period to a time of the power regulation period; if the detection module outputs the foam detection signal to the main control module, the main control module acquires the heating time of the electric cooker in the current power regulation period, and calculates the time T for the electric cooker to stop heating according to the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio; and the main control module controls the electric cooking device to stop heating when receiving the foam detection signal, and resumes controlling the electric cooking device to perform heating work at the preset power regulation ratio when the heating stop time of the electric cooking device reaches T.
According to the anti-overflow control device of the electric cooker provided by the embodiment of the invention, after the electric cooker enters a boiling stage, if the detection module outputs a foam detection signal to the main control module, the main control module acquires the heating time of the electric cooker in the current power regulation period, calculates the time T for stopping heating of the electric cooker according to the relation between the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio, controls the electric cooker to stop heating until the heating stop time of the electric cooker reaches T, and resumes to control the electric cooker to perform heating work according to the preset power regulation ratio, thereby calculating the heating stop time when the electric cooker is about to overflow based on the heating power regulation ratio of the electric cooker, not only preventing the electric cooker from overflowing, but also ensuring the electric cooker to be fully boiled during cooking food and ensuring the taste of the electric cooker, the life quality of the user is improved.
In some embodiments of the present invention, the main control module calculates a time T for the electric cooking device to stop heating according to a heating time of the electric cooking device in a current power adjustment period and the preset power adjustment ratio, where when N is greater than or equal to M, T is a-M, where a is a first preset constant, N is the heating time of the electric cooking device in the current power adjustment period, and M is the heating time corresponding to the preset power adjustment ratio; and when N is less than M, T is b-N, wherein b is a second preset constant.
In some embodiments of the present invention, when the main control module calculates a time T for stopping heating after the electric cooking device overflows according to a heating time of the electric cooking device in a current power regulation period and the preset power regulation ratio, where when N is greater than or equal to M, T is M0-N, wherein M0The time is the time of one power regulation period, N is the heating time of the electric cooker in the current power regulation period, and M is the heating time corresponding to the preset power regulation ratio; and when N is less than M, T is b-N, wherein b is a second preset constant.
Specifically, in one embodiment of the present invention, wherein M < a < 2M0,M<b<2M0,M0Is the time of one power cycle.
According to one embodiment of the present invention, the foam detection means is provided in an upper cover of the electric cooker.
In addition, the embodiment of the invention also provides an electric cooker which comprises the anti-overflow control device of the electric cooker.
According to the electric cooker, the anti-overflow control device can calculate the heating stop time when the overflow is about to occur based on the heating power regulation ratio, so that the overflow can be prevented, the full boiling of the cooked food can be ensured, the mouthfeel of the cooked food is ensured, and the life quality of a user is improved.
Drawings
Fig. 1 is a flowchart of an overflow preventing control method of an electric cooker according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a heating cooking curve of an electric cooker according to one embodiment of the invention;
FIG. 3a is a schematic diagram of an electric cooker according to an embodiment of the invention;
FIG. 3b is an overflow detection schematic of an electric cooker according to an embodiment of the present invention;
fig. 4 is a schematic structural view of an electric cooker according to another embodiment of the present invention;
FIG. 5a is a schematic circuit diagram of a foam sensing assembly according to an embodiment of the present invention;
FIG. 5b is a schematic circuit diagram of a foam sensing assembly according to another embodiment of the present invention;
FIG. 6 is a schematic structural view of a foam sensing assembly according to one embodiment of the present invention;
FIG. 7a is a schematic structural view of a foam sensing assembly for an electric cooker according to an embodiment of the present invention;
FIG. 7b is a schematic structural view of a foam sensing assembly for an electric cooker according to another embodiment of the present invention;
FIG. 8 is a flowchart of an anti-overflow control method of an electric cooker according to one embodiment of the present invention; and
fig. 9 is a block diagram illustrating an overflow preventing control apparatus of an electric cooker according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An overflow preventing control method of an electric cooker, an overflow preventing control device of an electric cooker, and an electric cooker having the same according to embodiments of the present invention will be described below with reference to the accompanying drawings.
In the embodiment of the invention, the electric cooker can be a cooking product such as an electric cooker, an electric pressure cooker and the like.
Fig. 1 is a flowchart of an overflow preventing control method of an electric cooker according to an embodiment of the present invention. As shown in fig. 1, the overflow preventing control method of the electric cooker includes the steps of:
and S1, after the electric cooker enters the boiling stage, controlling the electric cooker to heat according to a preset power regulation ratio, and detecting steam foam generated during cooking of the electric cooker through a foam detection device, wherein the preset power regulation ratio is the ratio of the heating time of the electric cooker in a power regulation period to the time of the power regulation period.
As shown in fig. 2, an electric cooker such as an electric rice cooker generally includes a water absorption stage, a heating stage, a boiling stage and a stewing stage when cooking rice, and an overflow phenomenon of the electric cooker generally occurs in the boiling stage. It should be noted that the boiling stage in the embodiment of the present invention may be broadly understood, for example, after the electric cooker starts to cook, the temperature in the electric cooker is detected, and when the temperature in the electric cooker is detected to reach a certain temperature, for example, 85 degrees celsius to 95 degrees celsius, the electric cooker may be considered to enter the boiling stage.
Therefore, in the boiling stage, the electric cooker can be controlled to perform low-power heating by a preset power regulation ratio, the preset power regulation ratio refers to the ratio of the heating time in one power regulation period actually adopted by the electric cooker in the boiling stage to the time of the power regulation period, and the heating time corresponding to the preset power regulation ratio is usually counted in seconds. That is, in the boiling stage, the electric cooker performs intermittent heating according to the preset power regulation ratio, namely, the electric cooker performs heating for a period of time t1 in one power regulation period, stops heating for another period of time t2, the sum of t1 and t2 is the time of one power regulation period, and t1 is the heating time corresponding to the preset power regulation ratio.
S2, if steam foam is detected, acquiring the heating time of the electric cooker in the current power adjusting period, and calculating the time T for the electric cooker to stop heating according to the heating time of the electric cooker in the current power adjusting period and the preset power adjusting ratio.
Wherein, the heating time of the electric cooker in the current power adjusting period is the heating time which is completed in the last power adjusting period when the steam foam generated by the electric cooker is detected, and is usually counted in seconds.
And S3, controlling the electric cooker to stop heating, and when the heating stop time of the electric cooker reaches T, resuming to control the electric cooker to perform heating operation according to the preset power adjustment ratio.
It should be noted that, in the cooking process of an electric cooker such as an electric rice cooker, since heat in the pot is accumulated continuously, after the electric rice cooker is detected to overflow and the electric rice cooker is controlled to stop heating, rice water in the pot cannot fall back immediately due to thermal inertia, a small amount of rice water enters an upper cover steam valve of the electric rice cooker, in order to ensure that the rice water falls back into the pot completely, the heating stop time T needs to be set longer after the electric rice cooker is detected to overflow, which may cause insufficient boiling of the electric rice cooker when cooking food. According to the anti-overflow control method of the electric cooker, after steam foam generated during cooking of the electric cooker is detected, the preset power regulation ratio and the heating time finished in the current power regulation period are firstly stored, then the time T seconds for the electric cooker to stop heating is calculated according to the relation between the heating time M corresponding to the preset power regulation ratio and the heating time N finished in the current power regulation period, and after the electric cooker is controlled to stop heating for the T seconds, the electric cooker is controlled to be heated by the preset power regulation ratio, so that the rice soup can be ensured to fall back completely and not overflow, the full boiling can be maintained, the quality of cooked food such as rice can be ensured, and the taste of the rice is improved.
In one embodiment of the invention, after the electric cooker enters the boiling stage, steam foam generated when the electric cooker cooks can be detected through a foam detection device arranged in an upper cover of the electric cooker.
Specifically, as shown in fig. 3a to 7b, the foam detecting device 10 is disposed in the upper cover of the electric cooker, and the foam detecting device 10 includes at least one foam sensing element 101, wherein when each foam sensing element 101 senses steam foam generated by the electric cooker, a capacitance value of the foam detecting device 10 changes; the detection module comprises a capacitance detection chip 20, the capacitance detection chip 20 is connected with the foam detection device 10, the capacitance detection chip 20 generates a foam detection signal by detecting the capacitance value change condition of the foam detection device 10, the capacitance detection chip 20 is connected with a main control module 40, the main control module 40 is connected with a heating power control module 30, the heating power control module 30 is used for controlling the heating power of the electric cooking device, when the main control module 40 judges that the capacitance value of the foam detection device 10 changes according to the foam detection signal, the overflow phenomenon of the electric cooking device is judged to happen, and calculating the time T seconds for the electric cooker to stop heating according to the relationship between the heating time corresponding to the preset power regulation ratio and the heating time finished in the current power regulation period, and after the electric cooker is controlled by the heating power control module 30 to stop heating for T seconds, the electric cooker is controlled to perform heating operation by the preset power regulation ratio.
Specifically, in the process that the electric cooker heats rice water in the inner pot, the capacitance detection chip 20 can detect the capacitance value variation of the foam detection device 10 in real time, when the electric cooker is in a water absorption stage and a heating stage, the temperature of a rice water mixture in the inner pot of the electric cooker is low, no steam foam or only a small amount of steam foam is generated, and the capacitance value of the foam detection device 10 is not changed; after rice water in the inner pot is heated to boiling, steam foam generated by boiling can contact the foam sensing assemblies 101 arranged at different positions, the capacitance value of each foam sensing assembly 101 can be changed when the foam sensing assembly is contacted with the steam foam, and then the capacitance value of the foam detection device 10 is changed. Further, the capacitance detection chip 20 detects a capacitance variation of the foam detection device, and if the capacitance variation of the foam detection device 10 is smaller than or equal to a preset threshold, the main control module 40 determines that the capacitance of the foam detection device 10 is not changed, and controls the electric cooker to maintain a preset power regulation ratio for heating; if the capacitance value variation of the foam detection device 10 is larger than the preset threshold, the capacitance value of the foam detection device is judged to be changed, and the phenomenon that the electric cooker is about to overflow is detected.
According to one embodiment of the present invention, as shown in fig. 3a and 4, each of the foam sensing assemblies 101 is disposed in the steam channel 3 of the upper cover 4 or on the lower surface of the upper cover. As shown in fig. 3a, the foam induction assembly 101 may be one, and the foam induction assembly 101 is disposed in the steam passage 3 of the electric cooker, and the steam flowing direction in the steam passage 3 is as shown by the arrow in fig. 3 a.
Specifically, when the rice water in the inner pot of the electric cooker is heated and boiled, the steam bubbles generated in the inner pot of the electric cooker contact the bubble sensing assembly 101 according to the flowing direction shown in fig. 3a, and the capacitance detecting chip 20 detects the capacitance variation of the foam detecting device 10 to generate the foam detecting signal. Furthermore, the main control module 40 determines whether the capacitance value of the foam detection device 10 changes according to the foam detection signal, and when the capacitance value variation of the foam detection device 10 is greater than the preset threshold, the main control module 40 determines that the capacitance value of the foam detection device 10 changes, thereby determining that the electric cooking device is about to overflow.
According to an embodiment of the present invention, as shown in fig. 3b, the power terminals of the capacitance detection chip 20 and the main control module 40 are connected to a preset power supply VDD, the preset power supply VDD is used for supplying power to the capacitance detection chip 20 and the main control module 40, and a first resistor R1 is further connected between the capacitance detection chip 20 and the foam detection device 10. Wherein, first resistance R1 is used for carrying out filtering processing to the capacitance value variation signal of foam response subassembly 101 to can play anti-jamming effect.
According to a specific example of the present invention, the resistance value of the first resistor R1 may be 10 Ω to 10k Ω.
According to an embodiment of the present invention, when the number of the bubble sensing members 101 is plural, the height between the installation position of each bubble sensing member 101 and the horizontal plane becomes gradually higher. In other words, the distance between each foam sensing assembly 101 and the surface of the rice-water mixture is gradually increased. And the higher the setting height of the foam sensing assembly 101 is, the closer the foam sensing assembly 101 is to the steam outlet a in the steam channel.
Specifically, the foam sensing assembly 101 may be disposed at different heights by providing protrusions at different heights in the steam channel 3.
For example, as shown in fig. 4, two foam sensing members 101, i.e., a first foam sensing member 101A and a second foam sensing member 101B, may be disposed in the steam channel 3 of the electric cooker, wherein the second foam sensing member 101B is disposed at the rear end of the steam channel 3, the second foam sensing member 101B is disposed on the upper surface inside the steam channel 3, the first foam sensing member 101A is disposed at the front end of the steam channel 3, and the first foam sensing member 101A is disposed on the protruding portion 301 of the upper surface, and thus, the disposition height of the second foam sensing member 101B is higher than that of the first foam sensing member 101A.
It should be understood that the flowing direction of the steam in the steam channel 3 is as shown by the arrow in fig. 4, and as can be seen from the changing direction of the arrow, the steam bubbles will enter the steam channel after being generated, and gradually approach to the steam outlet a of the steam channel 3 and gradually approach to a higher position, so that the steam bubbles first contact the first foam sensing element 101A and then contact the second foam sensing element 101B.
Specifically, as shown in fig. 4, in the heating process of rice water in the pot of the electric cooker, steam foam may rise to the position of the foam detecting device 10, when the steam foam contacts the first foam sensing element 101A, the capacitance value of the first foam sensing element 101A changes, the capacitance detecting chip 20 detects that the capacitance value variation of the foam detecting device 10 is Δ C1, and Δ C1 is less than or equal to a preset threshold, the capacitance detecting chip 20 may generate a first foam detecting signal, where the first foam detecting signal is a chip readable signal such as a digital signal, and at this time, the main control module 40 determines that the capacitance value of the foam detecting device 10 does not change, so that the main control module 40 controls the heating module 5 to keep the current power adjustment ratio unchanged through the heating power control module 30; continuing to heat, when steam foam contacts second foam response subassembly 101B, the capacitance values of first foam response subassembly 101A and second foam response subassembly 101B all change, capacitance detection chip 20 detects that the capacitance value variation of foam detection device 10 is Δ C2, Δ C2 is greater than preset threshold, capacitance detection chip 20 can generate second foam detection signal, wherein, second foam detection signal is chip readable signal such as digital signal, main control module 40 judges that the capacitance value of foam detection device 10 changes this moment, thereby detect that electric cooking ware is about to take place the overflow phenomenon.
It should be noted that the capacitance detecting chip 20 detects the capacitance variation of the foam detecting apparatus 10 as the sum of the capacitance variations of the plurality of foam sensing elements 101.
According to one embodiment of the present invention, the plurality of foam sensing elements 101 are connected together and then connected to the capacitance detecting chip 20.
According to an embodiment of the present invention, as shown in fig. 5a, a plurality of foam sensing elements 101 are connected together and then connected to the capacitance detecting chip 20 through a first resistor R1. Wherein, first resistance R1 is used for carrying out filtering processing to the capacitance value variation signal of foam response subassembly 101 to can play anti-jamming effect.
According to a specific example of the present invention, the resistance value of the first resistor R1 may be 10 Ω to 10k Ω.
According to one embodiment of the present invention, each of the foam sensing members 101 is connected to the capacitance detecting chip 20.
According to an embodiment of the present invention, as shown in fig. 5b, each of the foam sensing elements 101 is connected to the capacitance detecting chip 20 through a second resistor R2. Wherein, second resistance R2 is used for carrying out filtering processing to the capacitance value variation signal of foam response subassembly 101 to can play anti-jamming effect.
According to a specific example of the present invention, the resistance value of the second resistor R2 may be 10 Ω to 10k Ω.
According to an embodiment of the present invention, as shown in fig. 6, each foam sensing assembly 101 includes a foam contact portion 11 and a sensing portion 12, wherein the foam contact portion 11 is an insulator 100, the sensing portion 12 is a conductor 200, and the insulator 100 isolates the vapor foam from the conductor 200.
Specifically, as shown in fig. 6, the insulator 100 defines a receiving cavity 120 with an open upper surface, and the conductive body 200 defines an upper surface, a lower surface and side surfaces, wherein the conductive body 200 is disposed in the receiving cavity 120, the insulator 100 covers the lower surface and the side surfaces of the conductive body 200 at the same time, and the upper surface of the conductive body 200 is exposed from the insulator 100 so as to be connected to the capacitance detecting chip 20. Thus, by combining insulator 100 and conductor 200, capacitive foam sensing assembly 101 can be formed.
When the foam contact part 11 of the foam sensing assembly 101 is not contacted with the steam foam, each foam sensing assembly 101 in the foam detection device 10 only has the parasitic capacitance of the foam sensing assembly itself; when rice water in a pot in the electric cooker is heated and boiled, the generated steam foam and the foam contact part 11 and the sensing part 12 of the foam sensing component 101 form a capacitor, and according to the determining formula of the capacitor:(wherein, S is a dielectric constant, and is a facing surface area, and d is a distance between the electrode plates.) it can be seen that, as rice water in the pot of the electric cooker is heated and boiled more vigorously, more steam bubbles are generated, the larger the area of the bubble contact portion 11 covered by the steam bubbles is, and the larger the facing surface area S between the electrode plates is, the larger the amount of change in capacitance value of the bubble detecting device 10 is.
Therefore, the foam detection device isolates the steam foam from the conductive body 200 through the insulator 100, the insulator 100 is indirectly contacted with the steam foam, and the steam foam is detected by detecting the capacitance value change of the foam induction component 101, so that the non-electric contact detection of the foam is realized.
According to an embodiment of the present invention, the insulator 100 is disposed adjacent to the conductor 200. Wherein the insulator 100 may have a thickness of 1-10 mm.
Specifically, the equation for the capacitance-based decision is:it is understood that the larger the thickness of the insulator 100, the larger the inter-plate distance d, and the smaller the amount of change in capacitance in the case where the amount of steam bubbles overflowing is the same. In this way, the thickness of the insulator 100 can be selected as the case may be.
A foam sensing assembly 101 for an electric cooker according to one embodiment of the present invention will be described with reference to fig. 7 a.
As shown in fig. 7a, a foam sensing assembly 101 for an electric cooker according to an embodiment of the present invention includes an insulator 100 and an electric conductor 200.
Specifically, the conductive body 200 is horizontally disposed, that is, the thickness direction of the conductive body 200 is oriented in the up-down direction, whereby the lower surface of the conductive body 200 faces horizontally downward and the lower surface of the insulator 100 (i.e., the detection surface 110) faces horizontally downward, increasing the effective detection area, thereby improving the sensitivity of the overflow detection.
Alternatively, the area of the detecting surface 110 may be determined according to the size requirement of the detecting signal in practical application. For example, the area of the detection surface 110 is 50mm2-400mm2On the one hand, when there is less foam to touch the detection surface 110, it can still be guaranteed that the change in capacitance is large enough to facilitate detection, and on the other hand, it can be guaranteed that the interference of the outside to the overflow detection is small.
Advantageously, the detecting surface 110 is circular, i.e. the conductive body 200 is a circular piece, which not only facilitates the manufacturing process, but also the cross section of the cooking cavity of the electric cooking device is generally circular, and the circular detecting surface 110 has higher applicability.
Of course, the conductive body 200 and the detecting surface 110 may have any other shapes, and the present invention is not limited thereto.
In some embodiments of the present invention, as shown in fig. 7a, the insulator 100 further covers the side surfaces of the electrical conductor 200, i.e., the insulator 100 covers both the lower surface and the side surfaces of the electrical conductor 200. Thereby, the reliability of the overflow detection function of the foam sensing assembly 101 may be improved.
Specifically, as shown in fig. 7a, the insulator 100 defines a receiving cavity 120 with an open upper surface, the conductive body 200 is disposed in the receiving cavity 120, the insulator 100 covers the lower surface and the side surface of the conductive body 200 at the same time, and the upper surface of the conductive body 200 is exposed from the insulator 100 so as to be connected to the capacitance detecting chip.
Advantageously, as shown in fig. 7a, the height of the accommodating cavity 120 is greater than the thickness of the conductive body 200, and the conductive body 200 is disposed at the bottom of the accommodating cavity 120, so that the conductive body 200 can be stably placed in the insulator 100 due to the smaller thickness of the conductive body 200, and the conductive body 200 is prevented from falling out of the accommodating cavity 120 of the insulator 100.
In the following, a foam sensing assembly 101 for an electric cooker according to another embodiment of the present invention is described with reference to fig. 7b, the foam sensing assembly 101 for an electric cooker constituting a capacitive detection means.
As will be understood by those skilled in the art, the capacitive detection device refers to a device that, according to the capacitive sensing principle, when the detected medium is dipped into the detection device, the capacitance of the detection device changes, and the change is converted into a standard current signal, so as to realize the anti-overflow related control.
Specifically, as shown in fig. 7b, the foam sensing assembly 101 for the electric cooker according to the embodiment of the present invention includes a mount 300, a detection sheet 400, a mounting bracket 500, and an elastic member 600.
The mounting base 300 is provided with a groove 310 having an open upper surface. The test strip 400 is disposed within the recess 310. The mounting bracket 500 is detachably snapped on the upper surface of the mounting base 300. The elastic member 600 is disposed between the mounting bracket 500 and the test strip 400, the elastic member 600 is pressed by the mounting bracket 500 into the groove 310, and the elastic member 600 presses the test strip 400 against the bottom wall of the groove 310.
According to the foam sensing assembly 101 for the electric cooker, provided by the embodiment of the invention, the detection sheet 400 and the mounting seat 300 are combined to form a capacitance type detection device, when liquid (such as steam foam) in the electric cooker contacts the part, corresponding to the detection sheet 400, of the lower surface of the mounting seat 300, the overflow signal can be detected, and the cost is lower. In addition, the detection sheet 400 is pressed in the groove 310 by the elastic part 600 and the mounting bracket 500, and the mounting bracket 500 is detachably clamped on the mounting seat 300, so that the detection sheet 400 can be disassembled and assembled only by disassembling and assembling the mounting bracket 500, the method is simple and convenient, and good process assembly performance can be ensured. Therefore, the foam sensing assembly 101 for the electric cooker according to the embodiment of the present invention has the advantages of low cost, easy assembly and disassembly, etc.
As shown in fig. 7b, the foam sensing assembly 101 for the electric cooker according to the embodiment of the present invention includes a mounting base 300, a detection sheet 400, a mounting bracket 500, and an elastic member 600.
Advantageously, the elastic member 600 is formed as a single piece with the mounting bracket 500, which further reduces the number of steps for assembly and disassembly, thereby further facilitating assembly and disassembly.
In some embodiments of the present invention, as shown in fig. 7b, the elastic member 600 may be a spring, which has an upper end connected to the mounting bracket 500 and a lower end abutting against the test strip 400.
Further, the mounting bracket 500 is wound by the upper end of the spring, in other words, the upper end of the spring is rewound into a predetermined shape to constitute the mounting bracket 500, whereby the elastic member 600 and the mounting bracket 500 can be integrated, and the process is simple and the cost is low.
It is understood that in other embodiments of the present invention, when the foam detection device detects the steam foam generated during cooking in the electric cooker, other detection methods, such as an electrode detection method, may also be adopted.
In the embodiment of the present invention, the rice water in the pot does not boil and generate foam during the heating and temperature raising stage of the electric cooker, so that the rice water does not overflow. During the stewing period, no water is left in the pot, no foam is generated, and no overflow is generated. Therefore, in the heating and temperature rising stage and the stewing stage, if steam foam is detected, the steam foam can be regarded as false triggering, and the anti-overflow control treatment is not carried out.
In an embodiment of the invention, when the time T for stopping heating after the electric cooker overflows is calculated according to the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio, wherein when N is greater than or equal to M, T is a-M, where a is a first preset constant, N is the heating time of the electric cooker in the current power regulation period, and M is the heating time corresponding to the preset power regulation ratio; and when N is less than M, T is b-N, wherein b is a second preset constant.
It is understood that the first preset constant a and the second preset constant b can be determined according to the data of the actual test of the electric cooker, for example, a can be 14-22 seconds, preferably 18 seconds, and b can be 6-14 seconds, preferably 10 seconds.
Of course, in one embodiment of the invention, M < a < 2M0,M<b<2M0,M0For one power-regulating periodFor example, the time may be 16 to 32 seconds, preferably 16 seconds.
It should be noted that, in an embodiment of the present invention, when the electric cooker, such as an electric rice cooker, cooks rice, the first preset constant a and the second preset constant b may be set to different values according to different rice quantities. The first predetermined constant a and the second predetermined constant b may be set to the same value regardless of the amount of rice.
Wherein, the preset power adjusting ratio can be set differently according to different rice grades, and is specifically shown in table 1 below.
TABLE 1
Grade of rice quantity Presetting power modulation ratio (M/M)0) Heating time M corresponding to preset power regulation ratio
Amount of rice 10/16 10 seconds
Amount of rice 6/16 6 seconds
In another embodiment of the invention, when the time T for stopping heating after the electric cooker overflows is calculated according to the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio, wherein when N is larger than or equal to M, T is M0-N, wherein M0Is the time of one power regulation period, and N is the heating time of the electric cooker in the current power regulation periodM is the heating time corresponding to the preset power regulation ratio; and when N is less than M, T is b-N, wherein b is a second preset constant.
Preferably, the first preset constant a may also be equal to the second preset constant b.
Specifically, in an embodiment of the present invention, as shown in fig. 8, the above-mentioned overflow preventing control method of the electric cooker includes the steps of:
s10, the electric cooker cooks the food to enter a boiling stage.
And S20, judging whether the foam detection device detects steam foam generated when the electric cooker cooks. If yes, go to step S30; if not, return to step S20.
And S30, saving the heating time and the preset power regulation ratio of the electric cooker in the current power regulation period.
And S40, calculating the time T seconds for the electric cooking device to stop heating according to the heating time of the electric cooking device in the current power adjusting period and the heating time corresponding to the preset power adjusting ratio.
And S50, controlling the electric cooker to stop heating for T seconds.
And S60, controlling the electric cooker to continue heating operation at the preset power adjusting ratio.
In the embodiment of the invention, in the process of cooking food by the electric cooker such as an electric cooker, the overflow prevention control method is executed, so that the overflow phenomenon of the electric cooker can be effectively prevented, and the electric cooker can be ensured to be fully boiled when the food is cooked. The electric cooker can cook food without cooking, and can cook porridge, porridge or soup.
According to the anti-overflow control method of the electric cooker provided by the embodiment of the invention, after the electric cooker enters the boiling stage, if the foam detection device detects the steam foam generated during cooking of the electric cooker, the heating time of the electric cooker in the current power regulation period is obtained, the time T for stopping heating of the electric cooker is calculated according to the relation between the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio, the electric cooker is controlled to stop heating, and the electric cooker is controlled to resume to control the electric cooker to perform heating work according to the preset power regulation ratio until the heating stopping time of the electric cooker reaches T, so that the heating stopping time when the electric cooker is about to overflow is calculated based on the heating power regulation ratio of the electric cooker, the overflow phenomenon of the electric cooker can be prevented, the full boiling of the electric cooker during cooking of food can be ensured, the mouthfeel of food cooked by the electric cooker is ensured, and the life quality of a user is improved.
Fig. 9 is a block diagram illustrating an overflow preventing control apparatus of an electric cooker according to an embodiment of the present invention. As shown in fig. 9, the overflow preventing control apparatus of the electric cooker includes a detection module 1000 and a main control module 40.
After the electric cooker enters a boiling stage, the main control module 40 controls the electric cooker to perform heating operation according to a preset power regulation ratio, and the detection module 1000 detects steam foam generated during cooking of the electric cooker through a foam detection device to generate a foam detection signal, wherein the preset power regulation ratio is the ratio of the heating time of the electric cooker in one power regulation period to the time of the power regulation period; if the detection module 1000 outputs the foam detection signal to the main control module 40, the main control module 40 obtains the heating time of the electric cooker in the current power adjustment period, and calculates the time T for the electric cooker to stop heating according to the heating time of the electric cooker in the current power adjustment period and the preset power adjustment ratio; the main control module 40 controls the electric cooking device to stop heating when receiving the foam detection signal, and resumes controlling the electric cooking device to perform heating operation at the preset power regulation ratio when the heating stop time of the electric cooking device reaches T.
In one embodiment of the present invention, the detection module 1000 may include a capacitance detection chip, and the bubble detection means may be provided in an upper cover of the electric cooker.
The preset power regulation ratio refers to a ratio of heating time in a power regulation period actually adopted by the electric cooker in a boiling stage to time of the power regulation period, and the heating time corresponding to the preset power regulation ratio is usually counted in seconds. That is, in the boiling stage, the electric cooker performs intermittent heating according to the preset power regulation ratio, namely, the electric cooker performs heating for a period of time t1 in one power regulation period, stops heating for another period of time t2, the sum of t1 and t2 is the time of one power regulation period, and t1 is the heating time corresponding to the preset power regulation ratio.
The heating time of the electric cooker in the current power adjustment period is the heating time which is completed in the last power adjustment period when the steam foam generated by the electric cooker is detected, and is usually counted in seconds.
In an embodiment of the present invention, when the main control module 40 calculates a time T that needs to stop heating after the electric cooking device overflows according to the heating time of the electric cooking device in the current power adjustment period and the preset power adjustment ratio, where when N is greater than or equal to M, T is a-M, where a is a first preset constant, N is the heating time of the electric cooking device in the current power adjustment period, and M is the heating time corresponding to the preset power adjustment ratio; and when N is less than M, T is b-N, wherein b is a second preset constant.
It is understood that the first preset constant a and the second preset constant b may be determined according to data actually tested by the electric cooker, for example, a may be 18 seconds, and b may be 10 seconds.
Of course, in one embodiment of the invention, M < a < 2M0,M<b<2M0,M0The time for one power cycle may be, for example, 16 seconds.
In another embodiment of the present invention, the main control module 40 calculates a time T for stopping heating after the electric cooking device overflows according to the heating time of the electric cooking device in the current power regulation period and the preset power regulation ratio, wherein when N is greater than or equal to M, T is M0-N, wherein M0The time is the time of one power regulation period, N is the heating time of the electric cooker in the current power regulation period, and M is the heating time corresponding to the preset power regulation ratio; and when N is less than M, T is b-N, wherein b is a second preset constant.
According to the anti-overflow control device of the electric cooker provided by the embodiment of the invention, after the electric cooker enters a boiling stage, if the detection module outputs a foam detection signal to the main control module, the main control module acquires the heating time of the electric cooker in the current power regulation period, calculates the time T for stopping heating of the electric cooker according to the relation between the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio, controls the electric cooker to stop heating until the heating stop time of the electric cooker reaches T, and resumes to control the electric cooker to perform heating work according to the preset power regulation ratio, thereby calculating the heating stop time when the electric cooker is about to overflow based on the heating power regulation ratio of the electric cooker, not only preventing the electric cooker from overflowing, but also ensuring the electric cooker to be fully boiled during cooking food and ensuring the taste of the electric cooker, the life quality of the user is improved.
In addition, the embodiment of the invention also provides an electric cooker which comprises the anti-overflow control device of the electric cooker.
According to the electric cooker, the anti-overflow control device can calculate the heating stop time when the overflow is about to occur based on the heating power regulation ratio, so that the overflow can be prevented, the full boiling of the cooked food can be ensured, the mouthfeel of the cooked food is ensured, and the life quality of a user is improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (11)

1. An anti-overflow control method of an electric cooker is characterized by comprising the following steps:
after the electric cooker enters a boiling stage, controlling the electric cooker to heat according to a preset power regulation ratio, and detecting steam foam generated during cooking of the electric cooker through a foam detection device, wherein the preset power regulation ratio is the ratio of the heating time of the electric cooker in a power regulation period to the time of the power regulation period;
if the steam foam is detected, acquiring the heating time of the electric cooker in the current power regulation period, and calculating the time T for the electric cooker to stop heating according to the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio;
and controlling the electric cooker to stop heating, and when the heating stop time of the electric cooker reaches T, resuming to control the electric cooker to perform heating work at the preset power regulation ratio.
2. The overflow preventing control method of an electric cooker as claimed in claim 1, wherein when calculating the time T for which the electric cooker needs to stop heating according to the heating time of the electric cooker in the current power-up period and the preset power-up ratio, wherein,
when N is M, T is a-M, wherein a is a first preset constant, N is the heating time of the electric cooker in the current power adjusting period, and M is the heating time corresponding to the preset power adjusting ratio;
and when N is less than M, T is b-N, wherein b is a second preset constant.
3. The overflow preventing control method of an electric cooker as claimed in claim 1, wherein when calculating the time T for which the electric cooker needs to stop heating according to the heating time of the electric cooker in the current power-up period and the preset power-up ratio, wherein,
when N is M, T is M0-N, wherein M0The time is the time of one power regulation period, N is the heating time of the electric cooker in the current power regulation period, and M is the heating time corresponding to the preset power regulation ratio;
and when N is less than M, T is b-N, wherein b is a second preset constant.
4. The overflow preventing control method of an electric cooker as claimed in claim 2, wherein M < a < 2M0,M<b<2M0,M0Is the time of one power cycle.
5. The overflow preventing controlling method of an electric cooker as claimed in claim 1, wherein the foam detecting means is provided in an upper cover of the electric cooker.
6. An anti-overflow control device of an electric cooker is characterized by comprising a detection module and a main control module, wherein,
after the electric cooker enters a boiling stage, the main control module controls the electric cooker to perform heating work according to a preset power regulation ratio, and the detection module detects steam foam generated during cooking of the electric cooker through a foam detection device to generate a foam detection signal, wherein the preset power regulation ratio is the ratio of the heating time of the electric cooker in one power regulation period to the time of the power regulation period;
if the detection module outputs the foam detection signal to the main control module, the main control module acquires the heating time of the electric cooker in the current power regulation period, and calculates the time T for the electric cooker to stop heating according to the heating time of the electric cooker in the current power regulation period and the preset power regulation ratio;
and the main control module controls the electric cooking device to stop heating when receiving the foam detection signal, and resumes controlling the electric cooking device to perform heating work at the preset power regulation ratio when the heating stop time of the electric cooking device reaches T.
7. The overflow prevention control device of an electric cooker as claimed in claim 6, wherein when the main control module calculates the time T for the electric cooker to stop heating according to the heating time of the electric cooker in the current power-adjusting period and the preset power-adjusting ratio, wherein,
when N is M, T is a-M, wherein a is a first preset constant, N is the heating time of the electric cooker in the current power adjusting period, and M is the heating time corresponding to the preset power adjusting ratio;
and when N is less than M, T is b-N, wherein b is a second preset constant.
8. The overflow prevention control device of an electric cooker as claimed in claim 6, wherein when the main control module calculates the time T for stopping heating after the electric cooker overflows according to the heating time of the electric cooker in the current power-adjusting period and the preset power-adjusting ratio, wherein,
when N is M, T is M0-N, wherein M0The time is the time of one power regulation period, N is the heating time of the electric cooker in the current power regulation period, and M is the heating time corresponding to the preset power regulation ratio;
and when N is less than M, T is b-N, wherein b is a second preset constant.
9. The overflow preventing control device of the electric cooker as claimed in claim 7, wherein M < a < 2M0,M<b<2M0,M0Is the time of one power cycle.
10. The overflow preventing control device of the electric cooker as claimed in claim 6, wherein the foam detecting means is provided in an upper cover of the electric cooker.
11. An electric cooker comprising the overflow preventing control device of the electric cooker of any one of claims 6 to 10.
CN201710052029.8A 2017-01-18 2017-01-18 Electric cooker, anti-overflow control device and anti-overflow control method thereof CN108309041B (en)

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