CN107884032B - Electric cooker and anti-overflow detection device for same - Google Patents
Electric cooker and anti-overflow detection device for same Download PDFInfo
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- CN107884032B CN107884032B CN201610878454.8A CN201610878454A CN107884032B CN 107884032 B CN107884032 B CN 107884032B CN 201610878454 A CN201610878454 A CN 201610878454A CN 107884032 B CN107884032 B CN 107884032B
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- electric cooker
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- 238000001514 detection method Methods 0.000 title claims abstract description 185
- 239000006260 foam Substances 0.000 claims abstract description 276
- 230000000712 assembly Effects 0.000 claims abstract description 24
- 238000000429 assembly Methods 0.000 claims abstract description 24
- 230000008859 change Effects 0.000 claims abstract description 22
- 239000004020 conductor Substances 0.000 claims description 35
- 239000012212 insulator Substances 0.000 claims description 32
- 235000007164 Oryza sativa Nutrition 0.000 claims description 11
- 235000009566 rice Nutrition 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000009835 boiling Methods 0.000 abstract description 17
- 238000010438 heat treatment Methods 0.000 abstract description 14
- 241000209094 Oryza Species 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000010411 cooking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
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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
Abstract
The invention discloses an electric cooker and an anti-overflow detection device for the same, which comprises: the foam detection module comprises a plurality of foam sensing assemblies, wherein the height between the setting position of each foam sensing assembly and the horizontal plane is gradually increased gradually, and the capacitance value of the foam detection module is changed when each foam sensing assembly senses steam foam generated by the electric cooker; the capacitance detection chip is connected with the foam detection module and is used for generating a foam detection signal by detecting the capacitance value change condition of the foam detection module; and the main control chip is communicated with the capacitance detection chip to receive the foam detection signal and judge whether the electric cooker overflows or not according to the foam detection signal. Therefore, misjudgment can be prevented, foam detection precision is improved, full boiling in the heating process can be guaranteed, the electric cooker is prevented from overflowing, non-electric contact detection of foam is realized, and safety and reliability are realized.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to an anti-overflow detection device for an electric cooker and the electric cooker.
Background
The electric cooker in the related art is provided with a steam valve at the upper cover, to break up the foam passing through the steam valve, so that the vapor foam becomes liquid reflux. However, if the electric cooker is slightly more in water, the heating power is too high or in a plateau region, when a large amount of steam bubbles are generated, the steam valve is difficult to change all the steam bubbles into liquid to flow back, so that a large amount of steam bubbles overflow, the taste of rice is affected, the table top of the cooking table is polluted, and the table top is difficult to clean.
The related art proposes a method of detecting the overflow by adding the electrode on the upper cover of the electric cooker, but the related art has the disadvantage that the electrode is directly connected to the circuit as a conductor, so that the isolated power source is separated from the strong electricity in order to avoid causing the electric shock of the human body, the manufacturing cost is increased, and the assembly process is complicated. In addition, in the related art, low-power heating is adopted to prevent steam foam from overflowing, so that the boiling of the heating process is insufficient, and the taste of rice is poor.
Accordingly, improvements are needed in the related art.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide an anti-overflow detection device for an electric cooker, which is safe and reliable, and can ensure that the electric cooker is fully boiled and can prevent foam from overflowing.
Another object of the present invention is to propose an electric cooker.
In order to achieve the above-mentioned object, according to an embodiment of an aspect of the present invention, an anti-overflow detection device for an electric cooker includes: the foam detection module comprises a plurality of foam induction components, wherein the height between the setting position of each foam induction component and the horizontal plane is gradually increased gradually, and the capacitance value of the foam detection module is changed when each foam induction component senses steam foam generated by the electric cooker; the capacitance detection chip is connected with the foam detection module and is used for generating a foam detection signal by detecting the capacitance value change condition of the foam detection module; and the main control chip is communicated with the capacitance detection chip to receive the foam detection signal, and judges whether the electric cooker overflows or not according to the foam detection signal.
According to the anti-overflow detection device for the electric cooker, provided by the embodiment of the invention, the plurality of foam induction components are arranged, when each foam induction component induces steam foam generated by the electric cooker, the capacitance value of the foam detection module changes, the capacitance detection chip generates a foam detection signal by detecting the capacitance value change condition of the foam detection module, and the main control chip judges whether the electric cooker overflows or not according to the foam detection signal. Therefore, misjudgment can be prevented, foam detection precision is improved, and further, the heating process can be guaranteed to be fully boiling, and the electric cooker can be guaranteed not to overflow. And moreover, the non-electric contact detection of the foam is realized, a human body is not contacted with a conductor, the safety and the reliability are realized, an isolated power supply is not required to be adopted for supplying power, the manufacturing cost is reduced, and the assembly process is simplified.
According to one embodiment of the invention, each of the foam sensing assemblies includes a foam contact and a sensing portion, wherein the foam contact is an insulator and the sensing portion is an electrical conductor, the insulator isolating the vapor foam from the electrical conductor.
According to one embodiment of the present invention, the insulator is closely attached to the conductor.
According to one embodiment of the invention, the thickness of the insulator may be 1-10mm.
According to one embodiment of the invention, the plurality of foam sensing assemblies are connected together and then connected to the capacitance sensing chip.
According to one embodiment of the present invention, the plurality of foam sensing modules are connected together and then connected to the capacitance detection chip through a first resistor.
According to another embodiment of the invention, each of the foam sensing assemblies is separately connected to the capacitance sensing chip.
According to one embodiment of the invention, each of the foam sensing assemblies is connected to the capacitance detection chip through a second resistor.
According to one embodiment of the invention, each of the foam sensing assemblies is disposed within a steam channel of the electric cooker or a lower surface of an upper cover of the electric cooker.
In order to achieve the above object, another embodiment of the present invention provides an electric cooker, including the anti-overflow detection device for the electric cooker.
According to the electric cooker provided by the embodiment of the invention, through the anti-overflow detection device of the embodiment, misjudgment can be prevented, the foam detection precision is improved, and further, the electric cooker can be ensured to be fully boiled in the heating process and can be ensured not to overflow. And moreover, the non-electric contact detection of the foam is realized, a human body is not contacted with a conductor, the safety and the reliability are realized, an isolated power supply is not required to be adopted for supplying power, the manufacturing cost is reduced, and the assembly process is simplified.
According to one embodiment of the present invention, the electric cooker can be an electric cooker or an electric pressure cooker.
Drawings
Fig. 1 is a block schematic diagram of an overflow prevention detecting device for an electric cooker according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a foam sensing assembly according to one embodiment of the invention;
fig. 3 is a schematic structural view of an overflow preventing detecting device for an electric cooker according to an embodiment of the present invention;
FIG. 4 is a schematic installation view of an anti-overflow detection device for an electric cooker according to one embodiment of the invention;
fig. 5 is a schematic structural view of an overflow preventing detecting device for an electric cooker according to another embodiment of the present invention;
FIG. 6 is a schematic structural view of a foam sensing assembly according to an embodiment of the invention; and
fig. 7 is a schematic structural view of a foam sensing assembly according to an embodiment of the invention.
Reference numerals:
the device comprises a foam detection module 10, a capacitance detection chip 20 and a main control chip 30;
a foam sensing assembly 101; a foam contact portion 11 and a sensing portion 12; insulator 100 and conductor 200;
a first foam sensing assembly 101A and a second foam sensing assembly 101B; a steam valve seat 4;
a first resistor R1 and a second resistor R2;
a detection face 110 and a receiving cavity 120;
mount 300, detection piece 400, mount bracket 500, and elastic member 600; grooves 310.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
An electric cooker and an overflow preventing detection device for the same according to an embodiment of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a block schematic diagram of an overflow prevention detecting device for an electric cooker according to an embodiment of the present invention. As shown in fig. 1, the anti-overflow detecting device includes: the device comprises a foam detection module 10, a capacitance detection chip 20 and a main control chip 30.
The foam detection module 10 comprises a plurality of foam sensing assemblies 101, wherein the height between the setting position of each foam sensing assembly 101 and the horizontal plane is gradually increased, and the capacitance value of the foam detection module 10 changes when each foam sensing assembly 101 senses steam foam generated by the electric cooker; the capacitance detection chip 20 is connected with the foam detection module 10, and the capacitance detection chip 20 generates a foam detection signal by detecting the capacitance value change condition of the foam detection module 10, wherein a power end of the capacitance detection chip 20 is connected with a preset power supply VDD, and the preset power supply VDD is used for supplying power to the capacitance detection chip 20; the main control chip 30 communicates with the capacitance detection chip 20 to receive the foam detection signal, and judges whether the electric cooker overflows according to the foam detection signal, wherein a power end of the main control chip 30 is connected with a preset power supply VDD, and the preset power supply VDD is used for supplying power to the main control chip 30.
According to one particular embodiment of the present invention, the plurality of foam sensing assemblies 101 may be two or more foam sensing assemblies 101.
Specifically, the foam detection module 10 includes a plurality of foam sensing assemblies 101, and the height between the setting position of each foam sensing assembly 101 and the horizontal plane is gradually increased, and the capacitance value of each foam sensing assembly 101 changes when contacting the steam foam. After the electric cooker heats rice water in the inner pot to boiling, steam foam generated by boiling contacts the foam sensing assembly 101 arranged at different positions, the capacitance detection chip 20 can detect the capacitance value variation of the foam detection module 10 in real time and generate a foam detection signal according to the detected capacitance value variation, the capacitance detection chip 20 communicates with the main control chip 30 to send the foam detection signal to the main control chip 30, and the main control chip 30 judges whether the electric cooker overflows according to the foam detection signal.
For example, when the plurality of bubble sensing members 101 is two, if the steam bubble generated by boiling contacts the bubble sensing member having a low height between the set position and the horizontal plane, the capacitance detection chip 20 generates a first bubble detection signal; if the vapor foam generated by boiling contacts the foam sensing assembly at a relatively high elevation between the set point and the horizontal plane, the capacitance detection chip 20 generates a second foam detection signal. If the main control chip 30 receives the first foam detection signal, namely, only the capacitance value of the foam sensing assembly 101 with lower height between the setting position and the horizontal plane changes, the boiling is judged to be insufficient, the electric cooker does not overflow, and the main control chip 30 controls the electric cooker to keep the current output power unchanged; if the main control chip 30 receives the first foam detection signal and then receives the second foam detection signal, that is, the capacitance value of the foam sensing assembly 101 with higher height between the setting position and the horizontal plane also changes, it is judged that boiling is strong enough, the electric cooker overflows, the current output power of the electric cooker is controlled to be reduced, or the electric cooker is controlled to stop heating, so that steam foam is prevented from overflowing.
Therefore, the anti-overflow detection device can prevent misjudgment, improves foam detection precision, and further can ensure that the heating process is fully boiled and the electric cooker is not overflowed. And moreover, the non-electric contact detection of the foam is realized, a human body is not contacted with a conductor, the safety and the reliability are realized, an isolated power supply is not required to be adopted for supplying power, the manufacturing cost is reduced, and the assembly process is simplified.
According to one embodiment of the present invention, as shown in fig. 2, each foam sensing assembly 101 includes a foam contact 11 and a sensing portion 12, wherein the foam contact 11 is an insulator 100 and the sensing portion 12 is an electrical conductor 200, and the insulator 100 isolates the vapor foam from the electrical conductor 200. Specifically, the insulator 100 is used to contact the vapor bubble, and the insulator 100 isolates the vapor bubble from the electrical conductor 200, thereby performing non-electrical contact detection of the bubble.
Specifically, as shown in fig. 2, the insulator 100 defines a receiving chamber 120 with an upper surface opened, and the conductor 200 defines an upper surface, a lower surface and side surfaces, wherein the conductor 200 is provided in the receiving chamber 120, the insulator 100 covers both the lower surface and the side surfaces of the conductor 200, and the upper surface of the conductor 200 is exposed from the insulator 100 so as to be connected to the capacitance detection chip 20. Thus, by combining the insulator 100 and the conductor 200, the capacitive foam sensing assembly 101 can be formed.
When rice water in a pot in the electric cooker is not boiled, the foam contact part 11 of the foam sensing assembly 101 is not contacted with steam foam, and each foam sensing assembly 101 in the foam detection module 10 has only own parasitic capacitance; when rice water in a pot in the electric cooker is heated and boiled, generated steam foam forms a capacitor with the foam contact part 11 and the sensing part 12 of the foam sensing assembly 101, and the formula is determined according to the capacitor:(wherein ε is dielectric constant, S is the facing surface area, d is the distance between the plates), it is known that the more boiled rice water in the pot in the electric cooker is heated, the more steam bubbles are generated, and the more the area of the foam contact portion 11 covered by the steam bubbles isThe larger the facing surface area S between the plates, the larger the capacitance change of the foam detection module 10.
Thus, the foam detection apparatus isolates the steam foam from the conductive body 200 through the insulator 100, indirectly contacts the steam foam through the insulator 100, and detects the steam foam by detecting the change of the capacitance value of the foam sensing assembly 101, thereby realizing the non-electrical contact detection of the foam. In addition, misjudgment can be prevented, foam detection precision is improved, and therefore the heating process can be guaranteed to be fully boiling, and the electric cooker can be guaranteed not to overflow.
According to one embodiment of the present invention, insulator 100 is disposed in close proximity to electrical conductor 200.
According to one embodiment of the present invention, the thickness of the insulator 100 may be 1-10mm.
Specifically, the decision formula according to the capacitance is:it is understood that the larger the thickness of the insulator 100, the larger the inter-plate distance d, and the smaller the capacitance change amount, when the steam bubble overflow amount is the same. Thus, the thickness of the insulator 100 may be selected according to circumstances.
In one embodiment of the present invention, each of the foam sensing assemblies 101 is disposed in a steam passage of the electric cooker or a lower surface of an upper cover of the electric cooker, and the disposed height of each of the foam sensing assemblies 101 is sequentially increased. 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.
In particular, the foam sensing assembly 101 may be positioned at different heights by providing the steam channel 3 with bosses at different heights.
For example, as shown in fig. 4, two foam sensing assemblies 101, namely, a first foam sensing assembly 101A and a second foam sensing assembly 101B are disposed in a steam channel 3 of an electric cooker, wherein the second foam sensing assembly 101B is disposed at a rear end of the steam channel 3, and the second foam sensing assembly 101B is disposed on an upper surface inside the steam channel 3, the first foam sensing assembly 101A is disposed at a front end of the steam channel 3, and the first foam sensing assembly 101A is disposed on a boss 301 on the upper surface, whereby a set height of the second foam sensing assembly 101B is higher than a set height of the first foam sensing assembly 101A.
It should be understood that the flow direction of the steam in the steam channel 3 is shown by the arrow in fig. 4, and it can be seen from the changing direction of the arrow that the steam bubbles enter the steam valve seat 4 after being generated and gradually approach the steam outlet a of the steam channel 3 and gradually approach the upper part, so that the steam bubbles contact the first foam sensing assembly 101A and then contact the second foam sensing assembly 101B.
In accordance with one embodiment of the present invention, a plurality of foam sensing assemblies 101 are coupled together and then coupled to the capacitive sense die 20. That is, the plurality of foam sensing modules 101 are connected in series and then connected to the capacitance sensing chip 20.
Specifically, the sensing parts 12 of the plurality of foam sensing assemblies 101 may be connected together by conductors and then connected to the capacitance detection chip 20. According to an embodiment of the present invention, as shown in fig. 3, a plurality of foam sensing modules 101 are connected together and then connected to the capacitance sensing chip 20 through the first resistor R1. The first resistor R1 is used for filtering the capacitance value variation signal of the foam sensing assembly 101, so as to play an anti-interference role.
According to a specific example of the present invention, the resistance value of the first resistor R1 may be 10Ω to 10kΩ.
Specifically, as shown in fig. 3 and 4, the number of the foam sensing assemblies 101 may be two, that is, the first foam sensing assembly 101A and the second foam sensing assembly 101B, and the sensing portion 12 of the first foam sensing assembly 101A and the sensing portion 12 of the second foam sensing assembly 101B are connected through a conductor and then connected to the capacitance detection chip 20 through the first resistor R1, so that the capacitance detection chip 20 generates a foam detection signal according to the capacitance value variation of the first foam sensing assembly 101A and the second foam sensing assembly 101B.
After rice water in a pot in the electric cooker is heated to boiling, steam foam rises to a position where the foam detection module 10 is located, if the steam foam only contacts the first foam sensing assembly 101A, only the capacitance value of the first foam sensing assembly 101A changes, and at the moment, the capacitance detection chip 20 generates a first foam detection signal according to the capacitance value change amount of the first foam sensing assembly 101A; if the steam foam contacts the second foam sensing assembly 101B, the capacitance values of the first foam sensing assembly 101A and the second foam sensing assembly 101B are changed, and the capacitance detection chip 20 generates a second foam detection signal according to the sum of the capacitance value changes of the first foam sensing assembly 101A and the second foam sensing assembly 101B. Therefore, by judging through the two foam detection signals which are generated successively, misjudgment can be prevented, and foam detection precision is improved.
Specifically, as shown in fig. 3 and 4, when the steam foam contacts the first foam sensing assembly 101A, the sensing portion 12 of the first foam sensing assembly 101A senses that the capacitance value of the first foam sensing assembly 101A changes, the capacitance detection chip 20 detects that the capacitance value change amount of the foam detection module 10 is Δc1, Δc1 is greater than a first preset threshold value and less than a second preset threshold value, the capacitance detection chip 20 may generate a first foam detection signal, where the first foam detection signal is a chip readable signal, such as a digital signal, and the main control chip 30 communicates with the capacitance detection chip 20 to send the first foam detection signal to the main control chip 30; continuing to heat, when the steam foam contacts the second foam sensing component 101B, the sensing portion of the first foam sensing component 101A senses a change in capacitance value of the first foam sensing component 101A, and the sensing portion of the second foam sensing component 101B senses a change in capacitance value of the second foam sensing component 101B, the capacitance detection chip 20 detects that the capacitance values of the first foam sensing component 101A and the second foam sensing component 101B change at the same time, the capacitance value change amount of the foam detection module 10 is Δc2, Δc2 is greater than a second preset threshold value, the capacitance detection chip 20 can generate a second foam detection signal, wherein the second foam detection signal is a chip readable signal, for example, a digital signal, and the capacitance detection chip 20 communicates with the main control chip 30 to send the second foam detection signal to the main control chip 30.
Further, if the main control chip 30 receives the first foam detection signal, that is, only the capacitance value of the first foam sensing component 101A changes, the boiling is judged to be insufficient, the electric cooker does not overflow, and the main control chip 30 controls the electric cooker to keep the current output power unchanged; if the main control chip 30 receives the second foam detection signal after receiving the first foam detection signal, that is, the capacitance values of the first foam sensing assembly 101A and the second foam sensing assembly 101B are changed, it is judged that boiling is sufficiently intense, the electric cooker is about to overflow, and the current output power of the electric cooker is controlled to be reduced or the electric cooker is controlled to stop heating, so that steam foam is prevented from overflowing.
Therefore, the electric cooker can be ensured to be boiled sufficiently, and overflow can not be generated.
According to another embodiment of the present invention, as shown in fig. 5, each foam sensing assembly 101 is separately connected to a capacitance sensing chip 20.
According to an embodiment of the present invention, as shown in fig. 5, each of the foam sensing assemblies 101 is connected to the capacitance sensing chip 20 through a second resistor R2, respectively. The second resistor R2 is used for filtering the capacitance value variation signal of the foam sensing assembly 101, so as to play a role in resisting interference.
According to a specific example of the present invention, the resistance value of the second resistor R2 may be 10Ω to 10kΩ.
Specifically, as shown in fig. 4 and 5, the number of the foam sensing modules 101 may be two, that is, the first foam sensing module 101A and the second foam sensing module 101B, the sensing portion 12 of the first foam sensing module 101A is connected to the capacitance detection chip 20 through the second resistor R2, and the sensing portion 12 of the second foam sensing module 101B is connected to the capacitance detection chip 20 through the second resistor R2, so that the capacitance detection chip 20 generates a detection signal according to the capacitance value variation amounts of the first foam sensing module 101A and the second foam sensing module 101B, respectively.
After rice water in a pot in the electric cooker is heated to boiling, steam foam rises to a position where the foam detection module 10 is located, if the steam foam only contacts the first foam sensing assembly 101A, the capacitance value of the first foam sensing assembly 101A changes, and the capacitance detection chip 20 generates a first foam detection signal according to the capacitance value change amount of the first foam sensing assembly 101A; if the steam foam contacts the second foam sensing assembly 101B, the capacitance value of the second foam sensing assembly 101B changes, and the capacitance detection chip 20 generates a second foam detection signal according to the capacitance value change amount of the second foam sensing assembly 101B. Therefore, by judging through the two foam detection signals which are generated successively, misjudgment can be prevented, and foam detection precision is improved.
As shown in fig. 4 and 5, the steam foam first contacts the first foam sensing assembly 101A, the sensing portion 12 of the first foam sensing assembly 101A senses that the capacitance value of the first foam sensing assembly 101A changes, the capacitance value change amount of the first foam sensing assembly 101A detected by the capacitance detection chip 20 is Δc1, and the capacitance detection chip 20 may generate a first foam detection signal, where the first foam detection signal is a chip readable signal, such as a digital signal, and the main control chip 30 communicates with the capacitance detection chip 20 to send the first foam detection signal to the main control chip 30; heating is continued until the steam foam contacts the second foam sensing component 101B, the sensing portion of the second foam sensing component 101B senses that the capacitance value of the second foam sensing component 101B changes, the capacitance value change amount of the second foam sensing component 101B detected by the capacitance detection chip 20 is Δc2, and the capacitance detection chip 20 can generate a second foam detection signal, where the second foam detection signal is a chip readable signal, for example, a digital signal, and the capacitance detection chip 20 communicates with the main control chip 30 to send the second foam detection signal to the main control chip 30.
Further, if the main control chip 30 receives the first foam detection signal, that is, only the capacitance value of the foam sensing assembly 101 with a lower set height changes, the boiling is judged to be insufficient, the electric cooker does not overflow, and the main control chip 30 controls the electric cooker to keep the current output power unchanged; if the main control chip 30 receives the second foam detection signal, that is, the capacitance value of the foam sensing assembly 101 with higher setting height changes, it is judged that boiling is sufficiently intense, the electric cooker overflows immediately, and the current output power of the electric cooker is controlled to be reduced or the electric cooker is controlled to stop heating, so that steam foam is prevented from overflowing.
Therefore, the electric cooker can be ensured to be boiled sufficiently, and overflow can not be generated.
A foam sensing assembly 101 for an electric cooker according to one embodiment of the present invention is described below with reference to fig. 6.
As shown in fig. 6, a foam sensing assembly 101 for an electric cooker according to an embodiment of the present invention includes an insulator 100 and a conductor 200.
Specifically, the conductor 200 is disposed horizontally, i.e., the thickness direction of the conductor 200 is oriented in the up-down direction, whereby the lower surface of the conductor 200 is directed horizontally downward and the lower surface of the insulator 100 (i.e., the detection surface 110) is directed horizontally downward, increasing the effective detection area and thus improving the sensitivity of the spill-proof detection.
Alternatively, the area of the detection surface 110 may be determined according to the size of the detection signal in practical application. For example, the area of the detection surface 110 is 50mm 2 -400mm 2 On the one hand, when there is less foam in contact with the detection surface 110, it can still be ensured that the change in capacitance is large enough to facilitate detection, and on the other hand, that the disturbance of the outside to the spill-proof detection is small.
Advantageously, the detection surface 110 is circular, i.e. the electrical conductor 200 is a circular piece, which not only facilitates manufacturing, but also the cross section of the cooking cavity of the electric cooker is generally circular, which circular detection surface 110 has a higher applicability.
Of course, the conductor 200 and the detection surface 110 may have any other shape, which is not particularly limited in the present invention.
In some embodiments of the present invention, as shown in fig. 6, the insulator 100 further covers the side of the conductor 200, i.e., the insulator 100 covers both the lower surface and the side of the conductor 200. Thereby improving the reliability of the spill-proof detection function of the foam sensing assembly 101.
Specifically, as shown in fig. 6, the insulator 100 defines a receiving cavity 120 with an opened upper surface, the conductor 200 is disposed in the receiving cavity 120, the insulator 100 covers both a lower surface and a side surface of the conductor 200, and the upper surface of the conductor 200 is exposed from the insulator 100 so as to be connected to the capacitor chip.
Advantageously, as shown in fig. 6, the height of the receiving chamber 120 is greater than the thickness of the conductive body 200, and the conductive body 200 is disposed at the bottom of the receiving chamber 120, so that the conductive body 200 can be stably placed in the insulator 100 due to the small thickness of the conductive body 200, preventing the conductive body 200 from coming out of the receiving chamber 120 of the insulator 100.
A foam sensing assembly 101 for an electric cooker according to another embodiment of the present invention will be described with reference to fig. 7, the foam sensing assembly 101 for an electric cooker being a capacitive sensing device.
As will be appreciated by those skilled in the art, the capacitive sensing device is a device that, based on the principle of capacitive sensing, causes a change in capacitance of the device when immersed in a medium under test, which is converted into a standard current signal, thereby achieving spill-proof control.
Specifically, as shown in fig. 7, the foam sensing assembly 101 for an electric cooker according to an embodiment of the present invention includes a mounting base 300, a sensing piece 400, a mounting bracket 500, and an elastic member 600.
The mounting base 300 is provided with a groove 310 with an open upper surface. The test strip 400 is disposed within the recess 310. The mounting bracket 500 is detachably clamped on the upper surface of the mounting base 300. The elastic member 600 is provided between the mounting bracket 500 and the detecting piece 400, the elastic member 600 is pressed in the groove 310 by the mounting bracket 500, and the elastic member 600 presses the detecting piece 400 against the bottom wall of the groove 310.
According to the foam sensing assembly 101 for an electric cooker, a capacitive detection device is formed by combining the detection sheet 400 and the mounting seat 300, and when liquid (such as steam foam) in the electric cooker contacts with a part of the lower surface of the mounting seat 300 corresponding to the detection sheet 400, detection of an overflow signal can be realized, and the cost is lower. Moreover, the detecting piece 400 is pressed in the groove 310 by the elastic piece 600 and the mounting bracket 500, and the mounting bracket 500 is detachably clamped on the mounting seat 300, so that the detecting piece 400 can be dismounted only by dismounting the mounting bracket 500, and the detecting piece is simple and convenient, and can ensure good process assembly property. Thus, the first and second substrates are bonded together, the foam sensing assembly 101 for the electric cooker has the advantages of low cost, convenience in assembly and disassembly and the like.
As shown in fig. 7, the foam sensing assembly 101 for an electric cooker according to an embodiment of the present invention includes a mounting base 300, a sensing piece 400, a mounting bracket 500, and an elastic member 600.
Advantageously, the elastic member 600 is integrated with the mounting bracket 500, so that the number of assembling and disassembling steps can be further reduced, thereby further facilitating the assembling and disassembling.
In some embodiments of the present invention, as shown in fig. 7, the elastic member 600 may be a spring, and an upper end of the spring is connected to the mounting bracket 500 and a lower end of the spring abuts against the test piece 400.
Further, the mounting bracket 500 is wound from the upper end of the spring, in other words, the upper end of the spring is rewound into a predetermined shape to construct 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.
In summary, according to the anti-overflow detection device for the electric cooker provided by the embodiment of the invention, the plurality of foam sensing assemblies are arranged, when each foam sensing assembly senses steam foam generated by the electric cooker, the capacitance value of the foam detection module changes, the capacitance detection chip generates a foam detection signal by detecting the capacitance value change condition of the foam detection module, and the main control chip judges whether the electric cooker overflows according to the foam detection signal, so that the anti-overflow detection device can prevent misjudgment, improve the foam detection precision, further ensure that the heating process is fully boiled, and ensure that the electric cooker does not overflow. And moreover, the non-electric contact detection of the foam is realized, a human body is not contacted with a conductor, the safety and the reliability are realized, an isolated power supply is not required to be adopted for supplying power, the manufacturing cost is reduced, and the assembly process is simplified.
In order to achieve the above objective, another embodiment of the present invention provides an electric cooker, which includes the anti-overflow detection device for an electric cooker of the above embodiment.
According to one embodiment of the invention, the electric cooker may be an electric rice cooker or an electric pressure cooker.
In summary, according to the electric cooker provided by the embodiment of the invention, through the anti-overflow detection device provided by the embodiment of the invention, misjudgment can be prevented, foam detection precision is improved, and therefore, not only can the full boiling in the heating process be ensured, but also the electric cooker can be ensured not to overflow. In addition, realizes the non-electric contact detection of the foam, the human body does not contact with the electric conductor, the safety and the reliability are realized, the power supply of an isolated power supply is not needed, the manufacturing cost is reduced, and the assembly process is simplified.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (11)
1. An anti-overflow detection device for an electric cooker, characterized by comprising:
the foam detection module comprises a plurality of foam induction components, wherein the height between the setting position of each foam induction component and the horizontal plane is gradually increased gradually, and the capacitance value of the foam detection module is changed when each foam induction component senses steam foam generated by the electric cooker;
the capacitance detection chip is connected with the foam detection module and is used for generating a foam detection signal by detecting the capacitance value change condition of the foam detection module;
the main control chip is communicated with the capacitance detection chip to receive the foam detection signal and judge whether the electric cooker overflows or not according to the foam detection signal,
wherein, foam response subassembly includes mount pad, detection piece, installing support and elastic component, be equipped with the open recess in upper surface on the mount pad, the detection piece is established in the recess, installing support detachably clamps on the upper surface of mount pad, the elastic component is established between the installing support with the detection piece, the elastic component is by the installing support compresses tightly in the recess, just the elastic component will the detection piece compresses tightly on the diapire of recess, the lower surface of mount pad is suitable for contacting the liquid in the electric cooker to realize the detection of overflow signal, the area of foam response subassembly detection face is 50mm 2 -400mm 2 。
2. The anti-overflow detection device for an electric cooker of claim 1, wherein each of the foam sensing assemblies includes a foam contact portion and a sensing portion, wherein the foam contact portion is an insulator, the sensing portion is an electrical conductor, and the insulator isolates the steam foam from the electrical conductor.
3. The overflow preventing detecting device for an electric cooker as claimed in claim 2, wherein the insulator is disposed closely to the electric conductor.
4. The overflow preventing detecting device for an electric cooker as claimed in claim 2, wherein the thickness of the insulator is 1-10mm.
5. The overflow preventing detecting device for an electric cooker as claimed in any one of claims 1 to 4, wherein the plurality of foam sensing assemblies are connected together and then connected to the capacitance detecting chip.
6. The anti-overflow sensing device for an electric cooker as claimed in claim 5, wherein the plurality of foam sensing assemblies are connected together and then connected to the capacitance sensing chip through a first resistor.
7. The overflow preventing detecting device for an electric cooker as claimed in any one of claims 1 to 4, wherein each of the foam sensing assemblies is connected to the capacitance detecting chip, respectively.
8. The overflow preventing detecting device for an electric cooker as claimed in claim 7, wherein each of the foam sensing assemblies is connected to the capacitance detecting chip through a second resistor, respectively.
9. The overflow preventing detecting device for an electric cooker as claimed in claim 1, wherein each of the foam sensing assemblies is provided in a steam passage of the electric cooker or a lower surface of an upper cover of the electric cooker.
10. An electric cooker, characterized by comprising an anti-overflow detection device for an electric cooker according to any one of claims 1-9.
11. The electric cooker according to claim 10, wherein the electric cooker is an electric rice cooker or an electric pressure cooker.
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| CN201610878454.8A CN107884032B (en) | 2016-09-30 | 2016-09-30 | Electric cooker and anti-overflow detection device for same |
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| CN201610878454.8A CN107884032B (en) | 2016-09-30 | 2016-09-30 | Electric cooker and anti-overflow detection device for same |
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| CN110617507A (en) * | 2018-06-19 | 2019-12-27 | 佛山市顺德区美的电热电器制造有限公司 | Overflow control method, heating equipment and storage medium |
| CN112545318A (en) * | 2020-11-27 | 2021-03-26 | 深圳数联天下智能科技有限公司 | Water quantity detection method and steam oven |
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