CN108309045B - Electric cooker, anti-overflow detection system thereof and time calculation method of steam foam - Google Patents
Electric cooker, anti-overflow detection system thereof and time calculation method of steam foam Download PDFInfo
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- CN108309045B CN108309045B CN201710035421.1A CN201710035421A CN108309045B CN 108309045 B CN108309045 B CN 108309045B CN 201710035421 A CN201710035421 A CN 201710035421A CN 108309045 B CN108309045 B CN 108309045B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J27/00—Cooking-vessels
- A47J27/56—Preventing boiling over, e.g. of milk
- A47J27/62—Preventing 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
Abstract
The invention discloses an electric cooker, an anti-overflow detection system thereof and a time calculation method of steam foam, wherein the method comprises the following steps: detecting steam foam generated during cooking of the electric cooker through a foam detection device, and generating a foam detection signal when the foam detection device detects the steam foam; timing the duration time of each time that the foam detection device detects the steam foam through the first timer, and timing the time interval between two adjacent times of steam foam detected by the foam detection device through the second timer; and controlling the first timer and the second timer according to the foam detection signal, and calculating the time for continuously detecting the steam foam by the foam detection device according to the timing time of the first timer and the timing time of the second timer. Therefore, the time for continuously detecting the steam foam is accurately calculated, misjudgment can be reduced, safety and reliability are realized, the cooking effect of the electric cooker is ensured, and convenience is brought to the use of a user.
Description
Technical Field
The invention relates to the technical field of cooking appliances, in particular to an electric cooker, an anti-overflow detection system of the electric cooker and a time calculation method of steam foam.
Background
Generally, in the process of cooking rice using an electric cooker such as an electric rice cooker, a large amount of foam is generated, and when the foam is excessive, the foam overflows to the outside of the electric rice cooker, which not only affects the cooking effect, but also brings about a trouble of cleaning.
In the related art, some electric cookers are provided with an anti-overflow detection device to detect whether the electric cookers overflow in a boiling stage, and when detecting that the electric cookers overflow, corresponding measures are taken to ensure that the electric cookers do not overflow in the boiling stage.
However, in the above manner, the anti-overflow detection device may make an erroneous determination, such as that the overflow condition is not generated, and determine that the overflow condition is generated, so that the rice cooker is controlled to heat with low power, which results in insufficient boiling and affects the taste of the cooked food, or the overflow condition is detected all the time and the rice cooker is controlled to stop heating, so that the cooking cannot be continued, and inconvenience is brought to the user.
Disclosure of Invention
The object of the present invention is to solve at least to some extent one of the technical problems in the above-mentioned technology.
Therefore, an object of the present invention is to provide a method for calculating the time for continuously detecting steam foam by an anti-overflow detection system of an electric cooking device, which can reduce misjudgment based on calculating the time for continuously detecting steam foam, can accurately detect the steam foam when the electric cooking device is about to overflow, is safe and reliable, and brings convenience to users.
Another object of the present invention is to provide an anti-overflow detecting system 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 a method for calculating a time for continuously detecting steam bubbles by an anti-overflow detection system of an electric cooker, where the anti-overflow detection system includes a bubble detection device, and the method includes the following steps: detecting steam foam generated during cooking of the electric cooker through the foam detection device, and generating a foam detection signal when the steam foam is detected by the foam detection device; timing the duration time of the steam foam detected by the foam detection device each time through a first timer, and timing the time interval between two adjacent steam foams detected by the foam detection device through a second timer; and controlling the first timer and the second timer according to the foam detection signal, and calculating the time for the foam detection device to continuously detect the steam foam according to the timing time of the first timer and the timing time of the second timer.
The method for calculating the time for continuously detecting the steam foam by the anti-overflow detection system of the electric cooker provided by the embodiment of the invention detects the steam foam generated during cooking of the electric cooker through the foam detection device to judge whether the electric cooker is about to overflow or not, generates a foam detection signal if the steam foam generated during cooking of the electric cooker is detected, times the duration time of the steam foam detected each time by the foam detection device through the first timer, times the time interval between two adjacent steam foams detected by the foam detection device through the second timer, controls the first timer and the second timer according to the foam detection signal, calculates the time for continuously detecting the steam foam by the foam detection device according to the timing time of the first timer and the timing time of the second timer, from this can accurate calculation detect the time of steam foam in succession to can reduce the erroneous judgement, just can accurately detect when electric cooking ware is about to take place to spill over, avoid because the heating interruption that the erroneous judgement brought, boiling when guaranteeing electric cooking ware culinary art food is abundant, improve the taste of culinary art food, can also avoid because the unable continuation problem of culinary art that leads to of erroneous judgement, the use of giving the user brings the convenience.
According to an embodiment of the present invention, when the time counted by the second timer is greater than a first preset time, it is determined that the steam foam detected by the foam detecting device is discontinuous foam, the time counted by the first timer is taken as the time when the foam detecting device continuously detects the steam foam, and the first timer and the second timer are cleared.
In some embodiments of the present invention, when the time counted by the second timer is less than or equal to a first preset time, it is determined that the steam foam detected by the foam detection device is continuous foam, the time counted by the first timer is added to the time counted by the second timer, and the first timer is kept to continue counting, so as to calculate the time when the foam detection device continuously detects the steam foam according to the time counted by the first timer, and the second timer is cleared.
In some embodiments of the present invention, controlling the first timer and the second timer according to the bubble detection signal comprises: controlling the first timer to start timing when the steam foam is detected by the foam detection device; when the steam foam is not detected by the foam detection device, controlling the first timer to stop timing, and controlling the second timer to start timing; and controlling the second timer to stop timing when the foam detection device detects the steam foam again.
In order to achieve the above object, an anti-overflow detecting system for an electric cooking device according to another embodiment of the present invention includes a foam detecting device disposed in an upper cover of the electric cooking device, the foam detecting device being configured to detect steam foam generated during cooking of the electric cooking device; the detection module is connected with the foam detection device and is used for generating a foam detection signal when the foam detection device detects the steam foam; a first timer for timing a duration of each detection of the steam foam by the foam detection device; a second timer for timing a time interval between two adjacent steam bubbles detected by the bubble detecting device; the main control module is respectively connected with the detection module, the first timer and the second timer, and is used for controlling the first timer and the second timer according to the foam detection signal and calculating the time for the foam detection device to continuously detect the steam foam according to the timing time of the first timer and the timing time of the second timer.
The overflow prevention detection system of the electric cooker provided by the embodiment of the invention detects steam foam generated during cooking of the electric cooker through the foam detection device to judge whether the electric cooker is about to overflow, if the foam detection device detects the steam foam generated during cooking of the electric cooker, the detection module generates a foam detection signal, then the main control module times the duration time of each detection of the steam foam by the foam detection device through the first timer, times the time interval between two adjacent steam foams detected by the foam detection device through the second timer, finally controls the first timer and the second timer according to the foam detection signal, calculates the time of continuously detecting the steam foam by the foam detection device according to the timing time of the first timer and the timing time of the second timer, and can accurately calculate the time of continuously detecting the steam foam, thereby can reduce the erroneous judgement, just can accurately detect when electric cooking ware is about to take place to spill over, avoid because the heating interruption that the erroneous judgement brought, boiling when guaranteeing electric cooking ware culinary art food is abundant, improves the taste of culinary art food, can also avoid because the unable continuation problem of culinary art that leads to of erroneous judgement, the use of giving the user brings the convenience.
According to an embodiment of the present invention, when the time counted by the second timer is greater than a first preset time, the main control module determines that the steam foam detected by the foam detection device is discontinuous foam, uses the time counted by the first timer as the time when the foam detection device continuously detects the steam foam, and clears the first timer and the second timer.
In some embodiments of the present invention, when the time counted by the second timer is less than or equal to a first preset time, the main control module determines that the steam foam detected by the foam detection device is continuous foam, adds the time counted by the first timer to the time counted by the second timer, keeps the first timer to keep counting continuously, calculates the time of the foam detection device continuously detecting the steam foam according to the time counted by the first timer, and clears the second timer.
In some embodiments of the present invention, the main control module controls the first timer to start timing when the foam detection device detects the steam foam, controls the first timer to stop timing and controls the second timer to start timing when the foam detection device does not detect the steam foam, and controls the second timer to stop timing when the foam detection device detects the steam foam again.
According to one embodiment of the present invention, the bubble detecting means is disposed corresponding to the steam passage of the upper cover.
In addition, the embodiment of the invention also provides an electric cooker which comprises the anti-overflow detection system of the electric cooker.
According to the electric cooker, the anti-overflow detection system can accurately calculate the time for continuously detecting the steam foam, so that misjudgment can be reduced, the electric cooker can accurately detect the overflow when the electric cooker is about to overflow, heating interruption caused by misjudgment is avoided, sufficient boiling of the electric cooker during cooking food is ensured, the taste of the cooked food is improved, the problem that cooking cannot be continued caused by misjudgment can be avoided, and convenience is brought to the use of a user.
Drawings
Fig. 1 is a flowchart of a time calculation method for an anti-overflow detecting system of an electric cooker to continuously detect steam bubbles 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 a method for calculating a time when the anti-overflow detecting system of the electric cooker continuously detects steam bubbles according to one embodiment of the present invention; and
fig. 9 is a block schematic diagram of an anti-overflow detection system 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 electric cooker, an anti-overflow detecting system thereof, and a time calculating method of steam bubbles according to embodiments of the present invention will be described 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 a method for calculating a time when an overflow preventing detecting system of an electric cooker continuously detects steam bubbles according to an embodiment of the present invention. Wherein, this anti-overflow goes out detecting system and includes foam detection device.
As shown in fig. 1, the method for calculating the time for which the anti-overflow detecting system of the electric cooker continuously detects the steam bubbles includes the steps of:
and S1, detecting steam foam generated by the electric cooker during cooking through the foam detection device, and generating a foam detection signal when the foam detection device detects the steam foam.
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, it is possible to detect steam bubbles generated while the electric cooker cooks by the bubble detecting means in the boiling stage and to generate a bubble detecting signal when the steam bubbles are detected.
And S2, timing the duration of each time the steam foam is detected by the foam detection device through the first timer, and timing the time interval between two adjacent steam foams detected by the foam detection device through the second timer.
And S3, controlling the first timer and the second timer according to the foam detection signal, and calculating the time for the foam detection device to continuously detect the steam foam according to the timing time of the first timer and the timing time of the second timer.
It should be noted that, in the cooking process of cooking rice in an electric cooker such as an electric rice cooker, since heat in the pot is accumulated continuously, it can be determined that the electric rice cooker is about to overflow when steam bubbles are detected during cooking of the electric rice cooker, and after the electric rice cooker is controlled to stop heating, rice water in the pot cannot fall back immediately due to thermal inertia, steam bubbles will last for a period of time, and heating can be resumed when the rice water in the pot has fallen back, so that the electric rice cooker may overflow again, that is, steam bubbles will last for a period of time again. Wherein, the time interval between two adjacent steam foams is longer.
It should be noted that the steam foam is dynamically changed, and even in the case of a continuous foam, there are some interruptions, but the time interval between the interruptions of the continuous foam is generally short.
Therefore, in the embodiment of the present invention, the time interval between two adjacent steam foams is counted to determine whether the steam foam is discontinuous foam or continuous foam, generally, the time interval of the continuous foam is shorter, and the time interval of the discontinuous foam is not longer. In order to prevent an erroneous determination that an overflow condition is not generated or an overflow condition is generated as an overflow condition, whether it is a continuous bubble may be determined by a time interval between two adjacent steam bubbles, and a time when the steam bubbles are continuously detected may be calculated based on a bubble type (continuous bubble or discontinuous bubble).
Specifically, the steam bubbles generated when the electric cooker is about to overflow may last for a period of time, and the duration of each detection of the steam bubbles may be timed by the first timer. For example, when the foam detection device detects steam foam, the first timer is controlled to start timing, and when the foam detection device does not detect steam foam, the first timer is controlled to stop timing. So that the duration of each steam bubble can be obtained.
It will be appreciated that after the above-described failure to detect steam bubbles, steam bubbles are again detected after a time interval, wherein the time interval calculation may be completed by a second timer. For example, when the foam detection device does not detect the steam foam, the first timer is controlled to stop timing, the second timer starts timing, and when the foam detection device detects the steam foam again, the second timer stops working.
Further, the time at which the foam detecting means continuously detects the steam foam is calculated based on the counted time of the first timer (the duration of each steam foam) and the counted time of the second timer (the time interval between two adjacent steam foams).
The calculation modes are various and can be selected and set according to actual application requirements. For example, the timing time of the first timer and the timing time of the second timer are processed by a preset algorithm or a preset model, so as to obtain the time when the foam detection device continuously detects the steam foam.
Therefore, the method for calculating the time for continuously detecting the steam foam by the anti-overflow detection system of the electric cooker provided by the embodiment of the invention can accurately calculate the time for continuously detecting the steam foam, thereby reducing misjudgment, accurately detecting the steam foam when the electric cooker is about to overflow, avoiding heating interruption caused by misjudgment, ensuring sufficient boiling of the electric cooker when cooking food, improving the taste of the cooked food, avoiding the problem that the cooking cannot be continued caused by misjudgment, bringing convenience to the use of a user, avoiding the problem that the electric cooker overflows caused by misjudgment, and fully meeting the needs of the user.
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 the main control module 40, the main control module 40 is connected with the 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 phenomenon that the electric cooking device is about to overflow is judged, the duration time of the change of the capacitance value can be timed by the first timer, and the interval time of the change of the capacitance value can be timed by the second timer.
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 keep the current heating state; 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 heating state 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 ε is a dielectric constant, S is a facing surface area, and d is a distance between electrode plates.) it can be seen that the more vigorously the rice water in the pot of the electric cooker boils, the more steam bubbles are generated, the larger the area of the bubble contact part 11 covered by the steam bubbles, and the larger the facing surface area S between the electrode plates, the larger the amount of change in capacitance value of the bubble detection device 10.
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 an embodiment of the present invention, when the timed time of the second timer is greater than the first preset time, the main control module determines that the steam foam detected by the foam detection device is discontinuous foam, uses the timed time of the first timer as the time when the foam detection device continuously detects the steam foam, and clears the first timer and the second timer.
In an embodiment of the present invention, when the time counted by the second timer is less than or equal to a first preset time, the main control module determines that the steam foam detected by the foam detection device is continuous foam, adds the time counted by the first timer to the time counted by the second timer and keeps the first timer to keep counting continuously, so as to calculate the time of the foam detection device continuously detecting the steam foam through the time counted by the first timer, and clears the second timer.
Specifically, first, a first preset time, for example, 1 second or more, is preset, and whether the detected steam foam is a continuous foam or not can be determined by comparing the time interval between two adjacent steam foams (the timing time of the second timer) with the first preset time.
It should be noted that the first preset time can be set according to the actual application requirement, and is generally the time interval of the longest continuous foam.
It is understood that the detected steam bubbles are discontinuous bubbles when the timed time of the second timer is greater than the first preset time. Further, the timed time of the first timer is taken as the time when the foam detection device continuously detects the steam foam.
It is understood that the detected steam bubbles are continuous bubbles when the timing time of the second timer is less than or equal to the first preset time. Further, adding the timing time of the first timer and the timing time of the second timer, saving, keeping the first timer to keep timing continuously until the steam foam detected for a certain time is discontinuous foam, and taking the sum of the timing time of the first timer and the timing time of the previous second timer as the time when the foam detection device continuously detects the steam foam.
It should be noted that the first timer is an accumulated timer, and the second timer is cleared when the detected steam foam is determined to be continuous foam.
In one embodiment of the present invention, controlling the first timer and the second timer according to the bubble detection signal includes: when the foam detection device detects steam foam, controlling a first timer to start timing; when the foam detection device cannot detect the steam foam, controlling a first timer to stop timing, and controlling a second timer to start timing; and controlling the second timer to stop timing when the foam detection device detects the steam foam again.
Specifically, in an embodiment of the present invention, as shown in fig. 8, the method for calculating the time when the anti-overflow detecting system of the electric cooker continuously detects the steam bubbles includes the following steps:
s10, the electric cooker starts cooking.
And S20, controlling a first timer to start timing when the foam detection device detects the steam foam.
And S30, when the foam detection device cannot detect the steam foam, controlling the first timer to stop timing, and controlling the second timer to start timing.
And S40, controlling a second timer to stop timing when the foam detection device detects the steam foam again.
S50, determining whether the time counted by the second timer is greater than a first preset time, for example, 1 second. If yes, go to step S60; if not, step S70 is performed.
And S60, judging that the steam foam detected by the foam detection device is discontinuous foam, taking the time counted by the first timer as the time when the foam detection device continuously detects the steam foam, and resetting the first timer and the second timer.
And S70, judging that the steam foam detected by the foam detection device is continuous foam, adding the timing time of the first timer and the timing time of the second timer, storing the added timing time into the timing time of the first timer, resetting the second timer, and keeping the first timer to keep timing continuously, wherein the time of the steam foam continuously detected by the foam detection device is calculated through the accumulated timing of the first timer.
In the embodiment of the invention, in the process of cooking food by an electric cooker such as an electric cooker, the time calculation method for continuously detecting the steam foam by the anti-overflow detection system of the electric cooker is executed, so that the misjudgment can be reduced based on the calculation of the time for continuously detecting the steam foam, the electric cooker can accurately detect the overflow when the overflow is about to occur, the electric cooker is safe and reliable, and the use of a user is convenient.
The method for calculating the time for continuously detecting the steam foam by the anti-overflow detection system of the electric cooker provided by the embodiment of the invention detects the steam foam generated during cooking of the electric cooker through the foam detection device to judge whether the electric cooker is about to overflow or not, generates a foam detection signal if the steam foam generated during cooking of the electric cooker is detected, times the duration time of the steam foam detected each time by the foam detection device through the first timer, times the time interval between two adjacent steam foams detected by the foam detection device through the second timer, controls the first timer and the second timer according to the foam detection signal, calculates the time for continuously detecting the steam foam by the foam detection device according to the timing time of the first timer and the timing time of the second timer, from this can accurate calculation detect the time of steam foam in succession to can reduce the erroneous judgement, just can accurately detect when electric cooking ware is about to take place to spill over, avoid because the heating interruption that the erroneous judgement brought, boiling when guaranteeing electric cooking ware culinary art food is abundant, improve the taste of culinary art food, can also avoid because the unable continuation problem of culinary art that leads to of erroneous judgement, the use of giving the user brings the convenience.
In order to realize the embodiment, the invention further provides an anti-overflow detection system of the electric cooker.
Fig. 9 is a block schematic diagram of an anti-overflow detection system of an electric cooker according to an embodiment of the present invention. As shown in fig. 9, the overflow preventing detection system of the electric cooker includes a foam detection device 10, a detection module 1000, a first timer 2000, a second timer 3000, and a main control module 40.
Wherein, the foam detection device 10 is arranged in the upper cover of the electric cooker, and the foam detection device 10 is used for detecting steam foam generated when the electric cooker cooks. The detection module 1000 is connected to the foam detection device 10, and the detection module is configured to generate a foam detection signal when the foam detection device 10 detects steam foam. The first timer 2000 is used to time the duration of each time the vapor bubble is detected by the bubble detection device 10. The second timer 3000 is used for timing the time interval between two adjacent steam foams detected by the foam detecting device 10. The main control module 40 is connected to the detection module 1000, the first timer 2000 and the second timer 3000 respectively, and the main control module 40 is configured to control the first timer 2000 and the second timer 3000 according to the foam detection signal, and calculate the time for the foam detection apparatus 10 to continuously detect the steam foam according to the timing time of the first timer 2000 and the timing time of the second timer 3000.
In an embodiment of the present invention, when the time counted by the second timer 3000 is greater than the first preset time, the main control module 40 determines that the steam foam detected by the foam detecting device 10 is discontinuous foam, uses the time counted by the first timer 2000 as the time when the foam detecting device continuously detects the steam foam, and clears the first timer 2000 and the second timer 3000.
In an embodiment of the present invention, when the time counted by the second timer 3000 is less than or equal to the first preset time, the main control module 40 determines that the steam foam detected by the foam detecting device 10 is continuous foam, adds the time counted by the first timer 2000 to the time counted by the second timer 3000 and keeps the first timer 2000 to keep counting continuously, so as to calculate the time of the continuous detection of the steam foam by the foam detecting device 10 according to the time counted by the first timer 2000, and clears the second timer 3000.
In one embodiment of the present invention, the main control module 40 controls the first timer 2000 to start timing when the foam detection device 10 detects the steam foam, controls the first timer 2000 to stop timing and controls the second timer 3000 to start timing when the foam detection device 10 does not detect the steam foam, and controls the second timer 3000 to stop timing when the foam detection device 10 detects the steam foam again.
In one embodiment of the present invention, the bubble detecting means 10 is disposed corresponding to the steam passage of the upper cover.
Specifically, first, a first preset time, for example, 1 second or more, is preset, and whether the detected steam foam is a continuous foam or not can be determined by comparing the time interval between two adjacent steam foams (the timing time of the second timer) with the first preset time.
It should be noted that the first preset time can be set according to the actual application requirement, and is generally the time interval of the longest continuous foam.
It is understood that the detected steam bubbles are discontinuous bubbles when the timed time of the second timer is greater than the first preset time. Further, the timed time of the first timer is taken as the time when the foam detection device continuously detects the steam foam.
It is understood that the detected steam bubbles are continuous bubbles when the timing time of the second timer is less than or equal to the first preset time. Further, adding the timing time of the first timer and the timing time of the second timer, saving, keeping the first timer to keep timing continuously until the steam foam detected for a certain time is discontinuous foam, and taking the sum of the timing time of the first timer and the timing time of the previous second timer as the time when the foam detection device continuously detects the steam foam.
It should be noted that the first timer is an accumulated timer, and the second timer is cleared when the detected steam foam is determined to be continuous foam.
It should be noted that the explanation of the foregoing embodiment of the method for calculating the time for continuously detecting steam foam by the anti-overflow detecting system of the electric cooker is also applicable to the anti-overflow detecting system of the electric cooker of this embodiment, and details are not repeated here.
The overflow prevention detection system of the electric cooker provided by the embodiment of the invention detects steam foam generated during cooking of the electric cooker through the foam detection device to judge whether the electric cooker is about to overflow, if the foam detection device detects the steam foam generated during cooking of the electric cooker, the detection module generates a foam detection signal, then the main control module times the duration time of each detection of the steam foam by the foam detection device through the first timer, times the time interval between two adjacent steam foams detected by the foam detection device through the second timer, finally controls the first timer and the second timer according to the foam detection signal, calculates the time of continuously detecting the steam foam by the foam detection device according to the timing time of the first timer and the timing time of the second timer, and can accurately calculate the time of continuously detecting the steam foam, thereby can reduce the erroneous judgement, just can accurately detect when electric cooking ware is about to take place to spill over, avoid because the heating interruption that the erroneous judgement brought, boiling when guaranteeing electric cooking ware culinary art food is abundant, improves the taste of culinary art food, can also avoid because the unable continuation problem of culinary art that leads to of erroneous judgement, the use of giving the user brings the convenience.
In addition, in order to implement the above embodiment, the embodiment of the present invention further provides an electric cooking device, which includes the above anti-overflow detection system of the electric cooking device.
It should be noted that the explanation of the foregoing embodiment of the method for calculating the time when the anti-overflow detecting system of the electric cooker continuously detects the steam foam is also applicable to the electric cooker of this embodiment, and details are not repeated herein.
According to the electric cooker, the anti-overflow detection system can accurately calculate the time for continuously detecting the steam foam, so that misjudgment can be reduced, the electric cooker can accurately detect the overflow when the electric cooker is about to overflow, heating interruption caused by misjudgment is avoided, sufficient boiling of the electric cooker during cooking food is ensured, the taste of the cooked food is improved, the problem that cooking cannot be continued caused by misjudgment can be avoided, and convenience is brought to the use of a user.
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 (10)
1. An anti-overflow detection system for an electric cooker comprising:
the foam detection device is arranged in an upper cover of the electric cooker and is used for detecting steam foam generated during cooking of the electric cooker;
the detection module is connected with the foam detection device and is used for generating a foam detection signal when the foam detection device detects the steam foam; it is characterized by also comprising:
a first timer for timing a duration of each detection of the steam foam by the foam detection device;
a second timer for timing a time interval between two adjacent steam bubbles detected by the bubble detecting device;
the main control module is respectively connected with the detection module, the first timer and the second timer, and is used for controlling the first timer and the second timer according to the foam detection signal and calculating the time for the foam detection device to continuously detect the steam foam according to the timing time of the first timer and the timing time of the second timer.
2. The overflow preventing detection system of an electric cooker as claimed in claim 1, wherein when the timed time of the second timer is greater than a first preset time, the main control module determines that the steam foam detected by the foam detection device is discontinuous foam, and uses the timed time of the first timer as the time when the foam detection device continuously detects the steam foam, and clears the first timer and the second timer.
3. The overflow preventing detection system of an electric cooker as claimed in claim 1 or 2, wherein when the timed time of the second timer is less than or equal to a first preset time, the main control module determines that the steam foam detected by the foam detection device is continuous foam, adds the timed time of the first timer and the timed time of the second timer and keeps the first timer to keep timing continuously, so as to calculate the time when the foam detection device continuously detects the steam foam through the timed time of the first timer, and clears the second timer.
4. The overflow preventing detecting system of an electric cooker as claimed in claim 1, wherein said main control module controls said first timer to start timing when said foam detecting means detects said steam foam, controls said first timer to stop timing and controls said second timer to start timing when said foam detecting means does not detect said steam foam, and controls said second timer to stop timing when said foam detecting means detects said steam foam again.
5. The overflow preventing detection system of an electric cooker as claimed in claim 1, wherein the bubble detecting means is provided corresponding to the steam passage of the upper cover.
6. An electric cooker comprising an anti-overflow detection system of the electric cooker of any one of claims 1-5.
7. A method for calculating a time for an anti-overflow detection system of an electric cooker to continuously detect steam bubbles, the anti-overflow detection system including a bubble detection device, the method comprising the steps of:
detecting steam foam generated during cooking of the electric cooker through the foam detection device, and generating a foam detection signal when the steam foam is detected by the foam detection device; it is characterized by also comprising:
timing the duration time of the steam foam detected by the foam detection device each time through a first timer, and timing the time interval between two adjacent steam foams detected by the foam detection device through a second timer;
and controlling the first timer and the second timer according to the foam detection signal, and calculating the time for the foam detection device to continuously detect the steam foam according to the timing time of the first timer and the timing time of the second timer.
8. The method of claim 7, wherein when the timed time of the second timer is greater than a first preset time, the steam foam detected by the foam detection device is judged to be discontinuous foam, the timed time of the first timer is taken as the time when the foam detection device continuously detects the steam foam, and the first timer and the second timer are cleared.
9. The method of claim 7 or 8, wherein when the time counted by the second timer is less than or equal to a first preset time, the steam foam detected by the foam detection device is judged to be continuous foam, the time counted by the first timer is added to the time counted by the second timer, the first timer is kept to continue counting, the time of continuously detecting the steam foam by the foam detection device is calculated according to the time counted by the first timer, and the second timer is cleared.
10. The method of claim 7, wherein controlling the first timer and the second timer based on the foam detection signal comprises:
controlling the first timer to start timing when the steam foam is detected by the foam detection device;
when the steam foam is not detected by the foam detection device, controlling the first timer to stop timing, and controlling the second timer to start timing;
and controlling the second timer to stop timing when the foam detection device detects the steam foam again.
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| CN201710035421.1A CN108309045B (en) | 2017-01-18 | 2017-01-18 | Electric cooker, anti-overflow detection system thereof and time calculation method of steam foam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02297312A (en) * | 1989-05-12 | 1990-12-07 | Matsushita Electric Ind Co Ltd | Cooker |
| JP2004329595A (en) * | 2003-05-08 | 2004-11-25 | Matsushita Electric Ind Co Ltd | Rice cooker |
| CN101721130B (en) * | 2008-10-17 | 2011-12-07 | 林志鹏 | Anti-spilling control method for electric heating pot |
| CN203088792U (en) * | 2012-11-07 | 2013-07-31 | 美的集团股份有限公司 | Steam valve for electric rice cooker and electric rice cooker adopting same |
| CN203897997U (en) * | 2014-05-12 | 2014-10-29 | 佛山市顺德区美的电热电器制造有限公司 | Electric cooker |
| CN105078199B (en) * | 2014-05-12 | 2018-02-06 | 佛山市顺德区美的电热电器制造有限公司 | The control method of electric cooker and electric cooker |
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