CN106289449B - Capacitance type water level and water amount detection device, water boiling kettle and detection method - Google Patents

Capacitance type water level and water amount detection device, water boiling kettle and detection method Download PDF

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CN106289449B
CN106289449B CN201510318203.XA CN201510318203A CN106289449B CN 106289449 B CN106289449 B CN 106289449B CN 201510318203 A CN201510318203 A CN 201510318203A CN 106289449 B CN106289449 B CN 106289449B
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water level
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CN106289449A (en
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陈俊平
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Abstract

The invention relates to the technical field of tea sets, in particular to a capacitance type water level and water amount detection device, a water boiling kettle and a detection method. The invention discloses a capacitance type water level and water amount detection boiling kettle, which comprises a kettle body and a base, wherein the kettle body and the base are mutually and electrically connected through a coupler, a conductive part is arranged in the kettle body, a conductive cylinder with the surface covered with an insulating material is arranged on the inner bottom surface of the kettle body, the conductive part and the conductive cylinder with the surface covered with the insulating material jointly form a capacitor structure, a control circuit is arranged on the base, and the conductive cylinder is electrically connected with the control circuit through the coupler. The capacitor type water level and water quantity detection boiling kettle is characterized in that a conductive column body with the surface covered with an insulating material is arranged in the kettle body, and the kettle body of the boiling kettle is directly matched with the kettle body to form a capacitor structure, so that the real-time detection of the water level and the water quantity is realized based on the capacitance principle, the water is added into the boiling kettle, the water level of the boiling kettle is accurately and conveniently detected and controlled, and the reliability is high.

Description

Capacitance type water level and water amount detection device, water boiling kettle and detection method
Technical Field
The invention relates to the technical field of tea sets, in particular to a capacitance type water level and water amount detection device, a water boiling kettle and a detection method.
Background
The existing tea set is generally composed of a base and a kettle body, wherein the kettle body is provided with a heating unit, the base is provided with a control circuit, the heating unit is connected with the control circuit through a coupler, and the kettle body is also provided with a control switch and a temperature sensor. When the kettle is used, the base can be connected with the control circuit of the kettle body only by placing the kettle body on the base, the heating unit can work by pressing the control switch of the kettle body to heat liquid in the kettle body, the temperature sensor on the kettle body can detect the temperature of water in the kettle body, and therefore the power supply is automatically cut off when the water is boiled, and the kettle is safe and convenient to use.
However, the water level display of the existing tea set only marks the highest water level and the lowest water level on the kettle body, or at most only adopts the mode of embedding a transparent piece on the kettle body or setting a height indication in the kettle body so that a user can judge the water level through manual visual identification, the water level in the kettle body is not in accordance with the requirement possibly caused by negligence of the user, and therefore the tea set in the existing market is easy to break down or cause certain potential safety hazard in the using process.
At present, the water level detection of some boiling kettles utilizes the conductivity of water to carry out electrode type water level detection, and electrodes are in direct contact with the water to enable the electrodes to generate current so as to judge the water level. However, this method will cause different current passing through the electrodes due to different water quality, and thus different influence is generated, for example, because the resistance of pure water is large, the current passing through the electrodes is small; the resistance of the daily tap water is relatively small, and thus the current passing through the electrodes is relatively large. Therefore, the same amount of water will generate different currents due to different water quality, and the generated currents will even have larger differences, so that the detection and judgment errors will occur. Moreover, the electrode type water level detection can only be single-point detection, such as maximum detection, but cannot detect the water level and the water quantity in the kettle in real time.
Disclosure of Invention
The present invention aims to solve the above technical problem at least to some extent.
The invention mainly aims to provide a capacitance type water level and water quantity detection device which can detect water level and water quantity accurately in real time.
The invention further aims to provide a capacitance type water level and water quantity detection boiling kettle with a simple structure, wherein a conductive column body with the surface covered with insulating materials is arranged in a kettle body, and a capacitor structure is formed by directly utilizing the conductive part arranged in the kettle body of the boiling kettle in a matching way, so that the real-time detection of the water level and the water quantity is realized on the basis of the capacitance principle, and the reliability is high.
The third purpose of the invention is to provide a simple method for detecting the water level and the water quantity of the capacitance type water level and water quantity water boiling kettle.
In order to solve the technical problems, the invention adopts the technical scheme that:
the capacitor structure comprises a container provided with a conductive part and a conductive cylinder arranged in the container, the surface of the conductive cylinder is covered with an insulating material, the conductive cylinder is mutually insulated with the container, and the conductive part of the container is respectively electrically connected with the control circuit through a coupler.
The invention also provides a capacitance type water level and water amount detection boiling kettle adopting the capacitance type water level and water amount detection device, which comprises a kettle body and a base which are mutually and electrically connected through a coupler, wherein a conductive part is arranged in the kettle body, a conductive cylinder body with the surface covered by an insulating material is arranged on the inner bottom surface of the kettle body, the conductive part and the conductive cylinder body with the surface covered by the insulating material jointly form a capacitor structure, a control circuit is arranged on the base, and the conductive cylinder body is electrically connected with the control circuit through the coupler.
Optionally, the electrically conductive portion is an inner bottom surface or an inner wall surface of the kettle body. When the kettle body is made of a glass kettle and the like which are made of non-conductive materials, a conductive part can be arranged on the inner bottom surface of the kettle body; when the kettle body is made of a stainless steel kettle and the like which are made of conductive materials, the inner wall surface or the inner bottom surface of the kettle body can be directly used as a conductive part.
Further, the kettle body is provided with a highest water level line and a lowest water level line, and the highest point of the insulating material covered on the surface of the conductive cylinder is close to or flush with the highest water level line.
Preferably, the conductive column is arranged perpendicular to the inner bottom surface of the kettle body.
As an improvement, an exposed section of conductor extends upwards from one end of the conductive column far away from the inner bottom surface of the kettle body, the surface of the exposed section of conductor is not covered with an insulating material, and the exposed section of conductor is arranged higher than the highest water level line in the kettle body.
The invention further provides a water level and water quantity detection method of the capacitance type water level and water quantity detection boiling kettle, wherein a conductive part and a conductive column body of the kettle body are mutually insulated, and the conductive part and the conductive column body form two electrodes of a capacitor, and the detection method comprises the following steps:
s1, when no water exists in a kettle body of the boiling kettle, a medium between a conductive part and a conductive column body of the kettle body is an insulating material and air, and at the moment, a capacitance value measured by a control circuit is a lowest water level and water quantity capacitance value;
s2, when water is added into the kettle body of the boiling kettle, the medium between the conductive part of the kettle body and the conductive column body is water, the direct current between the conductive part and the conductive column body is zero, at the moment, the control circuit measures the capacitance increase and judges a water level and water quantity signal, and the water level and water quantity value is obtained through the conversion of a single chip microcomputer in the control circuit;
and S3, when the water in the kettle body of the water boiling kettle is filled, the medium between the conductive part of the kettle body and the conductive column body is water, the direct current between the conductive part and the conductive column body is zero, at the moment, the control circuit judges a highest water level and water quantity signal, and a single chip microcomputer in the control circuit converts the highest water level and water quantity signal to obtain a highest water level and water quantity value and sends a water adding stopping signal.
As a further improvement method for the improved structure, when the conductive column extends upwards to form an exposed section of conductor at one end far away from the inner bottom surface of the kettle body, the detection method also comprises the following steps:
and S4, when the water in the kettle body of the water boiling kettle is filled and exceeds the highest water level line arranged in the kettle body, the water in the kettle body is contacted with the exposed section of the electric conductor, the direct current between the electric conduction part of the kettle body and the exposed section of the electric conductor is not zero, at the moment, the control circuit judges a water level and water amount signal exceeding the highest water level line in the kettle body, and a corresponding water level and water amount value is obtained through conversion of a single chip microcomputer in the control circuit and a water adding stopping signal is sent out.
Compared with the prior art, the invention has the beneficial effects that:
the capacitance type water level and water quantity detection device provided by the invention realizes the detection of the water level and the water quantity on the basis of the capacitance principle by adopting the structural design of the capacitor, and the detection is real-time and accurate.
The capacitor type water level and water volume detection boiling kettle is simple in structure, the conductive column body with the surface covered with the insulating material is arranged in the kettle body, and the kettle body of the boiling kettle is directly matched with the kettle body to form a capacitor structure, so that the real-time detection of the water level and the water volume is realized based on the capacitance principle, the water is added into the boiling kettle, the water level of the boiling kettle is accurately and conveniently detected and controlled, and the reliability is high.
The water level and water quantity detection method of the capacitance type water level and water quantity detection boiling kettle is simple and convenient, and the detection is real-time and accurate.
Drawings
FIG. 1 is a schematic structural view of a water boiling kettle with capacitive water level and water amount detection according to an embodiment.
FIG. 2 is a circuit diagram of a water boiling kettle with a second capacitive water level and water amount detection according to an embodiment.
FIG. 3 is another basic circuit diagram of a water boiling kettle with a second capacitive water level and water amount detection according to an embodiment.
Fig. 4 is a schematic structural view of the three-capacitor water level and water amount detection kettle of the embodiment.
FIG. 5 is a circuit diagram of a water boiling kettle with three-capacitor water level and water amount detection according to an embodiment.
FIG. 6 is a first basic circuit diagram of a three-capacitor water level and quantity detection kettle according to an embodiment.
FIG. 7 is a second basic circuit diagram of the water level and quantity detection kettle of the third embodiment.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
In the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limiting the present patent.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
In addition, unless otherwise specified or limited, it should be noted that, if there are terms such as "mounted," "connected," and the like, they should be interpreted broadly, for example, they may be mechanically connected, electrically connected, or pneumatically connected, or they may be connected internally, directly, or indirectly through an intermediate medium, and those skilled in the art can understand the specific meaning of the terms according to specific situations.
Example one
The embodiment of the capacitive water level and water amount detection device comprises a capacitor structure and a control circuit for detecting the capacitance of the capacitor structure, wherein the capacitor structure comprises a container with a conductive part and a conductive cylinder arranged in the container, the surface of the conductive cylinder is covered with an insulating material, the conductive cylinder and the container are mutually insulated, and the conductive cylinder and the conductive part of the container are respectively and electrically connected with the control circuit through a coupler.
The conductive part and the conductive cylinder of the container are insulated from each other because the surface of the conductive cylinder is covered with an insulating material, and the conductive part and the conductive cylinder form two electrodes of the capacitor. When the water level in the container is gradually increased, the height of the conductive cylinder immersed in water is increased, the capacitance between the conductive part of the container and the conductive cylinder is correspondingly increased, the capacitance of the capacitor is detected by the control circuit, and the capacitance corresponds to the value of the water level and the water quantity one by one, so that the height of the water level in the container and the water quantity are obtained.
Example two
Fig. 1 to 3 show a first embodiment of a water boiling kettle with capacitive water level and water amount detection according to the present invention. As shown in FIG. 1, the kettle comprises a kettle body 20 and a base 10 which are electrically connected with each other through a coupler 30, wherein a conductive part is arranged in the kettle body 20, a conductive column 40 with an insulating material 41 covered on the surface is arranged on the inner bottom surface 21 of the kettle body 20, the conductive part and the conductive column 40 with the insulating material 41 covered on the surface form a capacitor structure together, a control circuit 11 is arranged on the base 10, and the conductive column 40 is electrically connected with the control circuit 11 through the coupler 30.
In the embodiment, the kettle body 20 is made of a glass kettle or the like which is made of a non-conductive material, so that the inner bottom surface 21 of the kettle body 20 is set to be a conductive part, the conductive column 40 is arranged perpendicular to the inner bottom surface 21 of the kettle body 20, the inner bottom surface 21 of the kettle body 20 and the conductive column 40 are insulated from each other due to the fact that the surface of the conductive column 40 is covered with the insulating material 41, and the two electrodes form two electrodes of the capacitor. Meanwhile, the kettle body 20 is provided with a highest water level line H and a lowest water level line (not shown), and the highest point of the insulating material 41 covered on the surface of the conductive column 40 is close to or level with the highest water level line H.
When water is not added into the water boiling kettle, the medium between the two electrodes is made of insulating materials 41 and air, when water is gradually added into the water boiling kettle and the water is immersed in the conductive column 40, the water is used as the medium to replace the air, and the dielectric constant of the water is far greater than that of the air, so that when the water level in the water boiling kettle is gradually increased, the height of the water immersed in the conductive column 40 is increased along with the water level, the capacitance between the inner bottom surface 21 of the kettle body 20 and the conductive column 40 is correspondingly increased, meanwhile, as the control circuit is respectively electrically connected with the two electrodes, the capacitance can be detected through the control circuit, and the capacitance corresponds to the value of the water level and the water volume one to one, so that the height of the water level in the water boiling kettle and the size of the water volume are obtained.
When the highest point of the insulating material 41 covered on the surface of the conductive column 40 is close to or level with the highest water level line H, the control circuit controls the kettle to stop adding water when the capacitance value corresponds to the value of the highest water level water quantity.
As shown in fig. 2 and 3, a basic circuit diagram, U, of the water boiler is shown IN Is a high frequency voltage, is connected to the conductive part B in the kettle, and the conductive column 40 (A) is connected to the current sampling resistor R and then to the ground terminal of the high frequency voltage to form a loop. When the water level in the kettle rises, the capacitance of the capacitor formed by the conductive part B and the conductive column 40 (A) in the kettle increases, the high-frequency current passing through the loop also increases, the voltage on the sampling resistor R increases, and the output voltage U is obtained after rectification and filtration OUT Increase, U OUT The height of the water level in the kettle and the size of the water volume are obtained through conversion of the single chip microcomputer.
EXAMPLE III
Fig. 4 to 7 show a second embodiment of the capacitive water level and quantity sensing kettle according to the present invention. Different from the second embodiment, the kettle body 20 is made of a stainless steel kettle or the like, and is made of a conductive material, so that the inner wall surface or the inner bottom surface of the kettle body 20 can be directly used as a conductive part. It will be appreciated that, in view of safety of use, even if the kettle body 20 is designed directly as a conductive part, a protective structure is provided to avoid danger to the user during use.
As shown in fig. 4, in the second embodiment, an exposed section of the conductor 42 extends upward from one end of the conductive column 40 away from the inner bottom 21 of the kettle body 20, the surface of the exposed section of the conductor 42 is not covered with an insulating material, and the exposed section of the conductor 42 is located higher than the highest water level line H in the kettle body 20, so that when the water level is higher than the highest water level line H in the kettle body 20, the water in the kettle body 20 contacts the exposed section of the conductor 42, that is, the water level is converted into an electrode type to detect the water level and the water amount in the boiling kettle. When the kettle is switched to electrode type water level and water quantity detection, the conductive part in the kettle body 20 and the exposed section of the conductor 42 form electrodes at two ends, and the position of the highest water level line H in the kettle body 20 needs to be determined at the moment.
That is, the present embodiment is a combination of capacitance and electrode to detect the water level and water amount in the kettle. As shown in fig. 5, 6 and 7, a basic circuit diagram, U, of the water boiler is shown IN Is a high frequency voltage or a direct current voltage and is connected to the conductive part B in the kettle. When the water level is at or below the highest water level line H, the high-frequency voltage U is applied IN When the voltage is converted into direct current voltage, the voltage drop on the sampling resistor R is zero due to the direct current blocking function of the capacitor; when the water level is higher than the highest water level line H (the highest water level line H is arranged just above the boundary line between the insulating material 41 of the conductive column 40 and the exposed conductor 42), the high-frequency voltage U is applied IN When the direct current is converted, the direct current voltage is conducted to the exposed section conductor 42 (A1) from the conducting part B of the kettle body through the water because the water is contacted with the exposed section conductor 42, and the voltage drop on the sampling resistor R is not zero at this time. Therefore, the high-frequency voltage and the direct-current voltage of the singlechip are converted in turn, so that two types of nodes of measuring the water level and the water quantity in a capacitance mode and measuring the water level and the water quantity in an electrode mode can be realizedAnd converting the construction method.
This embodiment had both had capacitanc measurement water level water yield's real-time detection's advantage, also can the precision measurement simultaneously boil the interior highest water level of kettle. It can be understood that an alarm module can be arranged on a control circuit of the water boiling kettle, and when the water level in the water boiling kettle is higher than the highest water level line, the alarm module responds to actions so as to remind a user of safe operation.
Example four
The embodiment of the water level and water quantity detection method of the capacitance type water level and water quantity detection boiling kettle, provided by the invention, has the advantages that the conductive part and the conductive column body of the kettle body are mutually insulated, and the conductive part and the conductive column body form two electrodes of a capacitor, and the detection method comprises the following steps:
s1, when no water exists in a kettle body of the boiling kettle, a medium between a conductive part and a conductive column of the kettle body is an insulating material and air, and at the moment, a capacitance value measured by a control circuit is a lowest water level and water volume capacitance value;
s2, when water is added into the kettle body of the boiling kettle, the medium between the conductive part and the conductive column body of the kettle body is water, the direct current between the conductive part and the conductive column body is zero, at the moment, the control circuit measures the capacitance increase and judges a water level and water quantity signal, and the water level and water quantity value is obtained through the conversion of a single chip microcomputer in the control circuit;
and S3, when the water in the kettle body of the water boiling kettle is filled, the medium between the conductive part of the kettle body and the conductive column body is water, the direct current between the conductive part and the conductive column body is zero, at the moment, the control circuit judges a highest water level and water quantity signal, and a single chip microcomputer in the control circuit converts the highest water level and water quantity signal to obtain a highest water level and water quantity value and sends a water adding stopping signal.
For the kettle structure of the third embodiment, when the conductive column extends upwards to form an exposed section of the conductor at one end far away from the inner bottom surface of the kettle body, the detection method of the embodiment further comprises the following steps:
and S4, when the water in the kettle body of the water boiling kettle is filled and exceeds the highest water level line arranged in the kettle body, the water in the kettle body is contacted with the exposed section of the electric conductor, the direct current between the electric conduction part of the kettle body and the exposed section of the electric conductor is not zero, at the moment, the control circuit judges a water level and water amount signal exceeding the highest water level line in the kettle body, and a corresponding water level and water amount value is obtained through conversion of a single chip microcomputer in the control circuit and a water adding stopping signal is sent out.
The water level and water amount detection method of the capacitance type water level and water amount detection boiling kettle is simple and convenient, high in reliability and real-time and accurate in detection.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (8)

1. The utility model provides a capacitanc water level water yield detection device, its characterized in that includes capacitor structure and is used for detecting the control circuit of capacitor structure electric capacity, capacitor structure including be equipped with conducting part's container with set up in electrically conductive cylinder in the container, electrically conductive cylinder surface covering has insulating material, electrically conductive cylinder with the container is mutual insulation, electrically conductive cylinder and the conducting part of container respectively through the coupler with the control circuit electricity is connected.
2. A capacitance type water level and quantity detection boiling kettle adopting the capacitance type water level and quantity detection device as claimed in claim 1, which comprises a kettle body and a base which are mutually and electrically connected through a coupler, and is characterized in that a conductive part is arranged in the kettle body, a conductive column body with the surface covered with an insulating material is arranged on the inner bottom surface of the kettle body, the conductive part and the conductive column body with the surface covered with the insulating material jointly form a capacitor structure, a control circuit is arranged on the base, and the conductive column body is electrically connected with the control circuit through the coupler.
3. The capacitive water level and amount detection kettle according to claim 2, wherein the conductive part is an inner bottom surface or an inner wall surface of the kettle body.
4. The capacitive water level and quantity detecting kettle according to claim 3, wherein the kettle body is provided with a highest water level line and a lowest water level line, and the highest point of the insulating material covered on the surface of the conductive cylinder is close to the highest water level line or is flush with the highest water level line.
5. The capacitive water level and quantity detection kettle according to claim 4, wherein the conductive column is arranged perpendicular to the inner bottom surface of the kettle body.
6. The capacitive water level and water amount detection boiling kettle as claimed in claim 3, wherein an exposed section of the electric conductor extends upwards from one end of the electric conducting column far away from the inner bottom surface of the kettle body, the surface of the exposed section of the electric conductor is not covered with an insulating material, and the exposed section of the electric conductor is arranged higher than the highest water level line in the kettle body.
7. A method for detecting the water level and water quantity of a condenser type water level and water quantity boiling kettle as claimed in any one of claims 2 to 6, wherein the conductive part of the kettle body and the conductive column are insulated from each other and constitute two electrodes of the capacitor, the method comprises the following steps:
s1, when no water exists in a kettle body of the boiling kettle, a medium between a conductive part and a conductive column body of the kettle body is an insulating material and air, and at the moment, a capacitance value measured by a control circuit is a lowest water level and water quantity capacitance value;
s2, when water is added into the kettle body of the boiling kettle, the medium between the conductive part of the kettle body and the conductive column body is water, the direct current between the conductive part and the conductive column body is zero, at the moment, the control circuit measures the capacitance increase and judges a water level and water quantity signal, and the water level and water quantity value is obtained through the conversion of a single chip microcomputer in the control circuit;
and S3, when the water in the kettle body of the water boiling kettle is filled, the medium between the conductive part of the kettle body and the conductive column body is water, the direct current between the conductive part and the conductive column body is zero, at the moment, the control circuit judges a highest water level and water quantity signal, and a single chip microcomputer in the control circuit converts the highest water level and water quantity signal to obtain a highest water level and water quantity value and sends a water adding stopping signal.
8. The method as claimed in claim 7, wherein when the conductive post extends a bare conductor at an end away from the bottom surface of the kettle, the method further comprises the following steps:
and S4, when the water in the kettle body of the boiling kettle is filled and exceeds the highest water level line arranged in the kettle body, the water in the kettle body is contacted with the exposed section of the electric conductor, the direct current between the electric conductor part of the kettle body and the exposed section of the electric conductor is not zero, at the moment, the control circuit judges a water level and water amount signal exceeding the highest water level line in the kettle body, and a corresponding water level and water amount value is obtained through conversion of a single chip microcomputer in the control circuit and a water adding stopping signal is sent out.
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