CN111920298B - A method and system for detecting water shortage in electric steamer - Google Patents
A method and system for detecting water shortage in electric steamer Download PDFInfo
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- CN111920298B CN111920298B CN201910394272.7A CN201910394272A CN111920298B CN 111920298 B CN111920298 B CN 111920298B CN 201910394272 A CN201910394272 A CN 201910394272A CN 111920298 B CN111920298 B CN 111920298B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 363
- 238000000034 method Methods 0.000 title claims description 7
- 238000001514 detection method Methods 0.000 claims abstract description 74
- 230000002950 deficient Effects 0.000 claims abstract description 22
- 238000005086 pumping Methods 0.000 claims abstract description 17
- 239000008213 purified water Substances 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 3
- -1 otherwise Substances 0.000 claims description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- A47J27/04—Cooking-vessels for cooking food in steam; Devices for extracting fruit juice by means of steam ; Vacuum cooking vessels
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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
- A47J36/00—Parts, details or accessories of cooking-vessels
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a water shortage detection method of an electric steam box, which comprises the steps of collecting a capacitance value C 1 of an internal water pipe of the electric steam box body in a state of being full of purified water and a capacitance value C 0 of the internal water pipe in a state of being free of water, starting a water pump, collecting the capacitance value C t of the internal water pipe in real time, recording a maximum capacitance value C 't of the internal water pipe, judging whether a water tank is deficient according to the relation between C t and C 1、C't and C 0, if so, stopping the water pump, prompting that the water tank is deficient, otherwise, the water tank has water, continuing pumping, recording the capacitance value C' t of the internal water pipe at the moment, judging whether air bubbles exist in the internal water pipe according to the relation between C t, C 1、C"t and C 0, if so, stopping the water pump, prompting that the water tank is deficient, otherwise, indicating that the water tank has water, and continuing pumping. The detection method and the detection system can be used for rapidly judging whether the water tank lacks water or not so as to protect the water pump.
Description
Technical Field
The invention belongs to the technical field of water level detection of an electric steam box, and particularly relates to a water shortage detection method and a detection system of the electric steam box.
Background
In the household appliance industry, an electric steam box is popular, and in order to ensure that an evaporator does not burn dry, a water level detection device is generally arranged, and water level detection methods which are relatively commonly used at present are a reed switch type detection method, a Hall element type detection method, an electrode type liquid level detection method and the like.
The water level sensor consists of reed pipe, float ball, pulley, permanent magnet, etc. when the float ball moves up and down due to the elevation of liquid level, the pulley and rope will drive the permanent magnet to move up and down, when the permanent magnet moves to the set position of the reed pipe, the normally open contact in the reed pipe is connected under the action of the magnetic field of the permanent magnet, when the permanent magnet moves away, the contact is released, and the water level condition can be known according to the connection and disconnection condition of the contact of the reed pipe.
The Hall element type detection method is that the Hall element is arranged outside the container, the permanent magnet is supported on the floater, and the magnetic induction intensity of the magnetic field acting on the Hall element is changed along with the change of the liquid level, so that the liquid level can be measured.
The electrode type liquid level detection method utilizes the principle of conductivity of water, utilizes water as a conductor through at least two electrodes (usually one is above and the other is below), and when the water simultaneously covers the two electrodes, a circuit is conducted, and when the water at least leaves one electrode, the electrode which leaves is disconnected with other electrodes, and the water level is judged through the on-off of the circuit.
The existing detection method only can judge whether the water tank has water or not, but can not rapidly judge whether the water tank lacks water, so that the water pump idles for a long time.
Disclosure of Invention
The invention aims to provide a water shortage detection method of an electric steam box, and aims to solve the problems that the existing detection method cannot rapidly judge water shortage of a water tank, so that a water pump idles for a long time and the service life of the water pump is reduced.
The invention further aims to provide a detection system applying the water shortage detection method of the electric steam box.
In order to solve the problems, the technical scheme adopted is as follows:
A water shortage detection method of an electric steam box comprises the steps of collecting a capacitance value C 1 of a built-in water pipe of an electric steam box body in a state of being full of purified water and a capacitance value C 0 of the built-in water pipe of the electric steam box body in an anhydrous state;
Starting a water pump, collecting the capacitance value C t of the built-in water pipe in real time, recording the maximum capacitance value C 't of the built-in water pipe, judging whether the water tank is deficient according to the relation among the capacitance value C t, the capacitance value C 1, the maximum capacitance value C' t and the capacitance value C 0, if yes, stopping the water pump, prompting that the water tank is deficient, otherwise, continuing pumping water when the water tank is deficient, recording the capacitance value C 't of the built-in water pipe at the moment, judging whether bubbles exist in the built-in water pipe according to the relation among the capacitance value C t, the capacitance value C 1, the capacitance value C' t and the capacitance value C 0, if yes, stopping the water pump, prompting that the water tank is deficient, otherwise, indicating that the water tank is deficient, and continuing pumping water.
Preferably, determining whether the water tank is water-deficient according to the relationship between the capacitance value C t and the capacitance value C 1, the maximum capacitance value C' t and the capacitance value C 0, includes:
When the difference between the capacitance value C t and the maximum capacitance value C' t is smaller than the threshold value and the capacitance value C t is larger than the capacitance value 1/2 (C 1-C0), water pumping is continued if the water tank has water, otherwise, water shortage of the water tank is indicated.
Preferably, whether there is a bubble in the built-in water pipe is determined according to the relationship between the capacitance value C t and the capacitance value C 1, the capacitance value C "t and the capacitance value C 0, specifically:
When the capacitance value C t is smaller than the capacitance value 1/3 (C' t-C0) or the capacitance value C t is smaller than the capacitance value 1/2 (C 1–C0) at least three times, the air bubbles are arranged in the built-in water pipe, the water pump stops to prompt the water tank to lack water, otherwise, the water tank has water, and water pumping is continued.
The detection system applying the electric steamer water shortage detection method comprises an electric steamer body, a control module and a capacitance detection module, wherein the control module and the capacitance detection module are arranged in the electric steamer body and are electrically connected with the capacitance detection module, and the capacitance detection module is arranged on a built-in water pipe of the electric steamer body to detect the capacitance of the water pipe.
Preferably, the control module comprises a capacitance measurement integrated circuit, a standard reference capacitance and a zero reference capacitance, wherein one ends of the standard reference capacitance and the zero reference capacitance are respectively and electrically connected with the capacitance measurement integrated circuit, the other ends of the standard reference capacitance and the zero reference capacitance are grounded, and the capacitance detection module is electrically connected with the capacitance measurement integrated circuit.
Preferably, the capacitance detection module comprises a first measuring electrode and a second measuring electrode, wherein the first measuring electrode and the second measuring electrode are respectively arranged on the outer side wall of the water pipe at intervals to realize the measurement of the capacitance of the water pipe.
Preferably, the first measuring electrode is grounded, and the second measuring electrode is electrically connected with the capacitance measuring integrated circuit.
Preferably, the first measuring electrode and the second measuring electrode are both arc-shaped metal electrodes.
Preferably, the first measuring electrode and the second measuring electrode are both buckled on the outer side wall of the water pipe.
Compared with the prior art, the invention has the beneficial effects that by adopting the technical scheme, the invention has the following advantages:
The detection method of the water shortage of the electric steam box comprises the steps of judging whether the water tank is deficient or not according to the relation between a capacitance value C t and a capacitance value C 1, a maximum capacitance value C t and a capacitance value C 0, and judging whether bubbles exist in an internal water pipe according to the relation between the capacitance value C t and the capacitance value C 1, the capacitance value C t and the capacitance value C 0, namely the detection method of the electric steam box can quickly judge whether the water tank is deficient or not according to whether the bubbles exist in the internal water pipe, further effectively avoid water pump idling, and is beneficial to protecting the water pump.
The electric steam box water shortage detection system can rapidly judge whether bubbles exist in the water pipe or not by detecting the capacitance value in the water pipe in real time, and further rapidly judge whether the built-in water tank of the electric steam box body is in a water shortage state, so that the problem that the water pump idles for a long time due to incapability of rapidly judging water shortage is avoided, the protection of the water pump is facilitated, and the service life of the water pump is prolonged.
Drawings
Fig. 1 is a schematic flow chart of a water shortage detection method of an electric steam box provided in embodiment 1 of the present invention;
Fig. 2 is a schematic structural diagram of a water shortage detection system of an electric steamer provided in embodiment 2 of the invention;
fig. 3 is a schematic diagram of a positional relationship between a built-in water pipe and a capacitance detection module in a water shortage detection system of an electric steamer according to embodiment 2 of the present invention;
In the figure, 1, a control module, 2, a capacitance detection module, 3, an embedded water pipe, 11, a capacitance measurement integrated circuit, 12, a standard reference capacitance, 13, a zero reference capacitance, 21, a first measurement electrode, 22 and a second measurement electrode.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment 1 of the invention provides a water shortage detection method of an electric steam box, which is shown in fig. 1 and comprises the following steps:
S1, collecting a capacitance value C 1 of a built-in water pipe of an electric steam box body in a pure water filled state and a capacitance value C 0 of the built-in water pipe in an anhydrous state;
S2, starting the water pump, collecting the capacitance value C t of the built-in water pipe in real time, recording the maximum capacitance value C ' t of the built-in water pipe, judging whether the water tank is deficient according to the relation between the capacitance value C t and the capacitance value C 1, the maximum capacitance value C ' t and the capacitance value C 0, if so, stopping the water pump to prompt that the water tank is deficient, otherwise, continuing pumping water from the water tank, and recording the capacitance value C ' t of the built-in water pipe at the moment;
S3, judging whether bubbles exist in the built-in water pipe according to the relation between the capacitance value C t and the capacitance value C 1, the capacitance value C' t and the capacitance value C 0, if so, stopping the water pump to prompt the water tank to lack water, otherwise, indicating that the water tank has water, and continuing pumping water;
Preferably, in the time threshold range, whether the water tank is deficient is judged according to the relationship between the capacitance value C t and the capacitance value C 1, the maximum capacitance value C' t and the capacitance value C 0, and the judgment condition may be:
In the time threshold range, when the difference value between the capacitance value C t and the maximum capacitance value C 't is smaller than the threshold value and the capacitance value C t is larger than the capacitance value 1/2 (C 1-C0), the water is continuously pumped, and the capacitance value C' t of the built-in water pipe is recorded at the moment;
Preferably, in the time threshold range, whether there is a bubble in the built-in water pipe is judged according to the relation between the capacitance value C t and the capacitance value C 1, the capacitance value C' t and the capacitance value C 0, and the judging condition can be as follows:
in the time threshold range, when the capacitance value C t is smaller than the capacitance value 1/3 (C' t-C0) or the capacitance value C t is smaller than the capacitance value 1/2 (C 1–C0) at least three times, the air bubble exists in the built-in water pipe, the water pump stops, and the water tank is indicated to lack water, otherwise, the water tank is indicated to have water, and water pumping is continued;
Preferably, in the time threshold range, when the capacitance value C t is smaller than the capacitance value 1/3 (C' t-C0) or the capacitance value C t is smaller than the capacitance value 1/2 (C 1–C0) in three times, the air bubbles are arranged in the built-in water pipe, the water pump stops, and the water tank is indicated to be lack of water;
The capacitance value C 1 of the built-in water pipe in the state of being full of purified water is used as a reference capacitance, because in the specific use process, tap water is usually in the built-in water pipe, and the threshold value (fluctuation range of the capacitance value of the built-in water pipe in the state of being full of purified water) of the tap water is different from that of the built-in water pipe, so that the drift is prevented from being misjudged as the state of having water.
The reason for the above determination in the time threshold range is as follows:
the water tank has three states, namely a water state, a water shortage state and a water-free state, and the water tank has two states, namely the water tank has more water, namely the water content in the water tank can ensure the normal operation of the water pump after the water pump is started, and the water tank is in a critical state of water existence and water shortage, namely the water tank is in a water existence state after the water pump is started, but the water content in the water tank is insufficient, and the water tank is directly changed into a water shortage state from the water existence state after the water pump is operated for a short time.
When the built-in water pipe contains air, the built-in water pipe has a short bubble state, and then the built-in water pipe is in a water state without air, and the water pump normally operates;
When the water tank is in a critical state with water and without water, the water pump is started for the first time, the built-in water pipe is still in a water state and usually contains air, after the water pump is started, the built-in water pipe is in a state with air bubbles because of the existence of the air, and the built-in water pipe is continuously in a bubble state until the water tank enters a water-free state because the water tank is not filled with the water because of insufficient water quantity of the water tank. Under such circumstances, if the operation of the water pump cannot be stopped in time, the water pump will always operate when the water tank is in a critical state of water and lack of water, until the water tank is anhydrous, the water pump can be stopped, which results in long-time idling of the water pump, and the service life of the water pump is reduced.
In order to solve the problem that the water pump idles for a long time when the water tank is in a critical state of water existence and water shortage, the embodiment provides that the water pump needs to be executed within a time threshold range when judging whether the water tank exists or not, the time threshold value refers to a time period when the built-in water pipe has a short bubble state when more water exists in the water tank, and therefore the water shortage condition of the water tank can be rapidly judged after the occurrence of bubbles. If the running time of the water pump exceeds the time threshold when the water tank is judged to be in water, the difference value between the capacitance value C t and the maximum capacitance value C' t is smaller than the threshold, and the capacitance value C t is larger than the capacitance value 1/2 (C 1-C0), the water pump is directly stopped, the problem that the water pump idles for a long time when the water tank is in a critical state with water and without water is effectively solved, and the service life of the water pump is prolonged.
When the water tank is in a water shortage state, the water pump is started for the first time, the built-in water pipe is in a state with residual water and air, after the water pump is started, the built-in water pipe is in a state with bubbles, if a time threshold is not specified, the bubble state can be continued until the water tank is in a water-free state, the water pump stops running, so that the water pump idles for a long time, and the service life of the water pump is reduced. If the time threshold is regulated, the water pump is directly stopped after the time threshold is exceeded, so that the water pump is effectively prevented from idling, and the service life of the water pump is prolonged.
The time threshold range in the embodiment is preferably 1 s-3 s, and the time period of the temporary bubble state of the built-in water pipe is usually 1 s-3 s when more water exists in the water tank, if the time period is 1 s-3 s longer, the built-in water pipe is still in the bubble state, and no matter the water tank is in a water shortage state or a critical state before the water pump is started, the water tank is in the water shortage state at the moment, so the time threshold is preferably 1 s-3 s, whether the water tank is in the water shortage state or not can be rapidly judged, and the water pump is prevented from idling.
It should be noted that if the capacitance value C t of the built-in water pipe is equal to the capacitance value C 0 of the built-in water pipe in the anhydrous state (detected before the built-in water pipe leaves the factory), it is indicated that the water tank is in the anhydrous state.
The specific process of the electric steam box water shortage detection is as follows:
The capacitance value C 1 of the water pipe arranged in the electric steam box body in the state of being full of purified water is collected;
Starting a water pump, collecting a capacitance value C t of a built-in water pipe in real time, and recording a maximum capacitance value C ' t of the built-in water pipe, if the difference value between the capacitance value C t and the maximum capacitance value C ' t is smaller than a threshold value within 1 s-3 s, and the capacitance value C t is larger than the capacitance value 1/2 (C 1-C0), continuing pumping water, and recording a capacitance value C ' t of the built-in water pipe at the moment, otherwise, indicating that the water tank lacks water;
Because the phenomenon that the water tank lacks water can occur at any time in the water pumping process, if the water tank lacks water, the water inlet of the water pump has air to enter the built-in water pipe, so that air bubbles exist in the built-in water pipe, if the water tank lacks water, the problem that the water pump idles for a long time can be solved, so that the judgment of whether the air bubbles exist in the built-in water pipe is increased, namely, in 1 s-3 s, when the capacitance value C t is smaller than the capacitance value 1/3 (C' t-C0) or the capacitance value C t is smaller than the capacitance value 1/2 (C 1–C0) in three times, the air bubbles exist in the built-in water pipe, the water pump stops, the water tank is prompted to lack water, otherwise, the water tank is continuously pumped, and the detection method of the embodiment can quickly judge that the water tank is in the water lacking state when the air bubbles exist in the built-in water pipe, so that the problem that the water pump idles for a long time is effectively avoided, and the service life of the water pump is prolonged.
The embodiment 2 of the invention provides a detection system applying the water shortage detection method of the electric steam box, which comprises an electric steam box body, a control module 1 and a capacitance detection module 2, as shown in fig. 2-3, wherein the control module 1 and the capacitance detection module 2 are arranged in the electric steam box body, the control module 1 is electrically connected with the capacitance detection module 2, the capacitance detection module 2 is arranged on an internal water pipe 3 of the electric steam box body to realize capacitance detection of the internal water pipe 3, the capacitance detection module 2 detects the capacitance value of the internal water pipe 3 in real time and sends the detection result to the control module 1, and the control module 1 is used for receiving the detection result sent by the capacitance detection module 2 and comparing the received detection result with stored data, so as to judge whether the water tank is deficient or not through the state of water in the water pipe;
Through the capacitance value of the built-in water pipe 3 of real-time detection to whether there is the bubble in the built-in water pipe 3 of quick judgement, and then whether the built-in water tank of quick judgement electric steamer body is in the water shortage state, avoid because can not judge the water shortage fast, and lead to the problem of long-time idle running of water pump, be favorable to protecting the water pump, improve the life of water pump.
The control module 1 comprises a capacitance measuring integrated circuit 11, a standard reference capacitance 12 and a zero reference capacitance 13, wherein one ends of the standard reference capacitance 12 and the zero reference capacitance 13 are respectively and electrically connected with the capacitance measuring integrated circuit 11, the other ends of the standard reference capacitance 12 and the zero reference capacitance 13 are grounded, the capacitance detecting module 2 is electrically connected with the capacitance measuring integrated circuit 11, the capacitance measuring integrated circuit 11 meets the requirement that a capacitance result and a capacitance change value form a linear change relation, measuring electrodes of the integrated circuit have the same internal capacitance, namely, empty PIN capacitance has consistency, the conventional touch capacitance chip can meet the requirement, for example, the capacitance measuring integrated circuit 11 is an 8PIN touch singlechip, and the standard reference capacitance 12 and the zero reference capacitance 13 are used for ensuring more accurate detection.
As shown in fig. 3, the capacitance detection module 2 comprises a first measuring electrode 21 and a second measuring electrode 22, wherein the first measuring electrode 21 and the second measuring electrode 22 are respectively arranged on the outer side wall of the built-in water pipe 3 at intervals to realize the measurement of the capacitance of the built-in water pipe 3;
The first measuring electrode 21 and the second measuring electrode 22 are all circular arc-shaped metal electrodes, and the first measuring electrode 21 and the second measuring electrode 22 are buckled on the outer side wall of the built-in water pipe 3, the interval distance is 10mm, and the purpose is to prevent the problems that the capacitance value of the water pipe is overlarge in the anhydrous state and the capacitance value of the water pipe is overlarge in the state of being full of water.
The water shortage detection process of the electric steam box comprises the following steps:
Firstly, a standard reference capacitor 12 and a zero reference capacitor 13 are respectively and electrically connected with a capacitance measuring integrated circuit 11 and are grounded to form a control module 1, and the control module 1 is arranged in an electric steamer body;
then, the first measuring electrode 21 and the second measuring electrode 22 are respectively arranged on the outer side wall of the built-in water pipe 3 in a fastening way at intervals, the interval distance is 10mm, the first measuring electrode 21 is grounded, and the second measuring electrode 22 is electrically connected with the capacitance measuring integrated circuit 11 to form an electric steam box water shortage detection system;
Finally, starting the water pump of the electric steamer body, simultaneously detecting the capacitance value C t of the built-in water pipe 3 in real time by the capacitance detection module 2, sending the capacitance value C t to the control module 1, judging whether the water tank is deficient or not by the control module 1, namely judging whether the difference between the capacitance value C t and the maximum capacitance value C ' t is smaller than a threshold value within 1 s-3 s, and if the difference is not smaller than the capacitance value C t and is larger than 1/2 (C 1-C0), stopping the water pump to prompt water deficiency; if yes, the water tank is in a water state, the water pump continues pumping, the capacitance value C ' t of the built-in water pipe is recorded, the capacitance detection module 2 continues detecting the capacitance value C t of the built-in water pipe 3 in real time, and sends the capacitance value C t to the control module 1, the control module 1 judges whether air bubbles exist in the water pipe or not, namely, whether the capacitance value C t is smaller than the capacitance value 1/3 (C ' t-C0) or whether the capacitance value C t is smaller than the capacitance value 1/2 (C 1–C0) or not is judged in 1 s-3 s or not, if yes, the water pump is stopped, water shortage is indicated, if no, the water tank is indicated to have water, pumping is continued, namely, in the water shortage detection process, whether the air bubbles exist in the built-in water pipe or not is judged rapidly, idle running of the water pump is avoided effectively, the water pump is protected, and the service life of the water pump is prolonged.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (8)
1. The water shortage detection method of the electric steam box is characterized by collecting a capacitance value C 1 of an internal water pipe of the electric steam box body in a state of being full of purified water and a capacitance value C 0 of the internal water pipe of the electric steam box body in an anhydrous state;
Starting a water pump, collecting a capacitance value C t of the built-in water pipe in real time, recording a maximum capacitance value C 't of the built-in water pipe, judging whether the water tank is deficient according to the relation between the capacitance value C t and the capacitance values C 1 and the maximum capacitance value C' t and the capacitance value C 0, if so, stopping the water pump, prompting that the water tank is deficient, otherwise, continuing pumping water when the water tank is deficient, recording a capacitance value C 't of the built-in water pipe at the moment, judging whether bubbles exist in the built-in water pipe according to the relation between the capacitance value C t and the capacitance values C 1 and the capacitance values C' t and the capacitance values C 0, and if so, stopping the water pump, prompting that the water tank is deficient, otherwise, prompting that the water tank is deficient, and continuing pumping water;
Judging whether the water tank is deficient or not according to the relation between the capacitance value C t and the capacitance value C 1, the maximum capacitance value C' t and the capacitance value C 0 in the time threshold range, comprising:
When the difference between the capacitance value C t and the maximum capacitance value C' t is smaller than the threshold value and the capacitance value C t is larger than the capacitance value 1/2 (C 1-C0), water pumping is continued if the water tank has water, otherwise, water shortage of the water tank is indicated.
2. The method of claim 1, wherein determining whether there is any air bubble in the internal water pipe according to the relationship between the capacitance value C t and the capacitance values C 1, C "t, and C 0 within the time threshold range comprises:
When the capacitance value C t is smaller than the capacitance value 1/3 (C' t-C0) or the capacitance value C t is smaller than the capacitance value 1/2 (C 1-C0) at least three times, the air bubbles are arranged in the built-in water pipe, the water pump stops to prompt the water tank to lack water, otherwise, the water tank has water, and water pumping is continued.
3. The detection system applying the electric steamer water shortage detection method according to any one of claims 1-2 is characterized by comprising an electric steamer body, a control module (1) and a capacitance detection module (2), wherein the control module (1) and the capacitance detection module (2) are arranged in the electric steamer body, the control module (1) is electrically connected with the capacitance detection module (2), and the capacitance detection module (2) is arranged on an internal water pipe (3) of the electric steamer body to realize capacitance detection of the internal water pipe (3).
4. A detection system according to claim 3, wherein the control module (1) comprises a capacitance measuring integrated circuit (11), a standard reference capacitor (12) and a zero reference capacitor (13), one end of the standard reference capacitor (12) and one end of the zero reference capacitor (13) are respectively electrically connected with the capacitance measuring integrated circuit (11), the other end of the standard reference capacitor is grounded, and the capacitance detection module (2) is electrically connected with the capacitance measuring integrated circuit (11).
5. A detection system according to claim 3, characterized in that the capacitance detection module (2) comprises a first measuring electrode (21) and a second measuring electrode (22), wherein the first measuring electrode (21) and the second measuring electrode (22) are respectively arranged on the outer side wall of the built-in water pipe (3) at intervals to realize the measurement of the capacitance of the built-in water pipe (3).
6. The detection system according to claim 5, wherein the first measurement electrode (21) is grounded and the second measurement electrode (22) is electrically connected to the capacitance measuring integrated circuit (11).
7. The detection system according to claim 6, characterized in that the first measuring electrode (21) and the second measuring electrode (22) are both circular arc shaped metal electrodes.
8. The detection system according to claim 7, characterized in that the first measuring electrode (21) and the second measuring electrode (22) are both snap-fitted on the outer side wall of the built-in water pipe (3).
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| CN116058644A (en) * | 2021-11-03 | 2023-05-05 | 广东美的生活电器制造有限公司 | Water pumping control method and device, food processor and storage medium |
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| CN210611846U (en) * | 2019-05-13 | 2020-05-26 | 华帝股份有限公司 | Electric steamer lacks water detecting system |
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