CN113027784A - Water shortage detection control method for submersible pump - Google Patents
Water shortage detection control method for submersible pump Download PDFInfo
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- CN113027784A CN113027784A CN202110350729.1A CN202110350729A CN113027784A CN 113027784 A CN113027784 A CN 113027784A CN 202110350729 A CN202110350729 A CN 202110350729A CN 113027784 A CN113027784 A CN 113027784A
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- transistor switch
- water
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- water level
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0077—Safety measures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a submersible pump water shortage detection control method, belongs to the technical field of submersible pump control, and solves the problems of water shortage detection and motor protection. The electronic probe is small in size and convenient to install. Meanwhile, the singlechip controls the operation of the water pump by using the relay through a certain algorithm, the low power can be directly controlled by using the relay, and the high-power motor can control the contactor by using the relay so as to control the water pump). The control mode can control the running time of the water pump through a certain algorithm, reduces frequent starting and prolongs the continuous running time of the water pump.
Description
Technical Field
The invention relates to the field of water pumps, in particular to a method for detecting and controlling water shortage of a submersible pump.
Background
The method adopted in the past mainly uses a temperature protection switch in the motor, and realizes the protection of the motor through over-temperature protection, but the protection method still has many problems, for example, after the water-deficient water pump is subjected to over-temperature protection, when the temperature is reduced, the water pump can still continue to operate to be protected again no matter whether water exists, and the risk of burning out the water pump is greatly increased. The float switch is also used to control the motor to run, when the water level is reduced, the float drops, and the switch cuts off the motor to cut off the power. The control mode has the problems that after water comes, the water pump is pumped out in a short time, so that the water pump is frequently started in a short working time each time, the failure rate of the float switch in practical application is high, and the float switch is complex to install and large in size.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, at least solves the technical problems in the related technology to a certain extent, and provides a method for detecting and controlling the water shortage of a submersible pump, so as to achieve the aim of effectively detecting and controlling the water shortage of the submersible pump, mainly realize the reliability and stability of the operation and facilitate the use.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a immersible pump water shortage detection control method, includes high-order detection circuitry, low level detection circuitry, singlechip and water pump motor control circuit, and high-order detection circuitry and low level detection circuitry are connected respectively on the singlechip, and a pin of singlechip is connected water pump motor control circuit in order to control the start-up and stop of water pump, the circuit connection structure of high-order detection circuitry and low level detection circuitry is the same, including probe, four transistor switch, and probe and four transistor switch connect into bridge structure, bridge structure has two control ends and a sample termination, and the input/output pin of singlechip is connected respectively to two control ends, and the sample termination connects the sampling pin of singlechip, and the singlechip includes following processing steps:
the method comprises the following steps: initializing configuration and starting timing;
step two: judging whether the running time reaches the detection time;
step three: when the detection time is up, entering a high-level detection circuit control step, entering a low-level detection circuit control step, entering a motor operation control step, and finally restarting timing;
step four: and when the detection time is not up, entering a motor operation control step, and then switching on and off the chamber again for timing.
The technical effects of the invention are mainly reflected in the following aspects: increase probe and exchange detection, use transistor switch to build a bridge circuit, the detected signal that produces the mode of exchanging detects whether there is water through feedback signal, the double-circuit detects, be less than minimum then lack of water, exceed and then can continue work for avoiding influencing each other between the two ways, when one way detects, the other way is closed completely, because the operation of water pump, the time that the water level experienced from the high point to the bottom is the time that the time of A water level is from the low point to the high point is the time of the minimum continuous operation of B water pump then for C, after the water level is higher than the peak, need continue the time of waiting: d ═ C × (B/a) -B.
Drawings
FIG. 1 is a block diagram showing a hardware configuration in an embodiment;
FIG. 2 is a circuit diagram showing a hardware configuration in the embodiment;
FIG. 3 is a flowchart illustrating the operation of the main process in the embodiment;
FIG. 4 is a schematic flow chart of the detection by probe Z1;
FIG. 5 is a schematic flow chart of the detection by probe Z2;
fig. 6 is a flow diagram of the motor process.
Detailed Description
The embodiments of the present invention will be described in detail below, examples of which are illustrated in the accompanying drawings, and the embodiments described below by referring to the drawings are exemplary and intended to explain the present invention so that the technical aspects of the present invention can be more easily understood and appreciated, and are not to be construed as limiting the present invention.
Example (b):
regarding the hardware structure, refer to fig. 1 and 2, and include a high detection circuit, a low detection circuit, a single chip microcomputer and a water pump motor control circuit, where the high detection circuit and the low detection circuit are respectively connected to the single chip microcomputer, and a pin of the single chip microcomputer is connected to the water pump motor control circuit to control the start and stop of the water pump. The singlechip is used as a core and detects the high water level and the low water level respectively by using a signal detection circuit. When the water level is lower than the low water level, the water pump stops working. According to the algorithm, after the water pump starting time is reached, the single chip microcomputer controls the water pump to operate.
The high-order detection circuit comprises a probe Z1, a transistor switch N1, a transistor switch N2, a transistor switch N3, a transistor switch N4, a transistor switch P1, a transistor switch P2, a resistor R1, a resistor R2 and a capacitor C1, wherein a voltage source Vcc is connected with one end of the resistor R1, the other end of the resistor R1 is connected with the emitters of the transistor switch P1 and the transistor switch P2, the base of the transistor switch P1 is connected with the collector of the transistor switch N3, the collector of the transistor switch P3 is connected with one end of the probe Z3 and the collector of the transistor switch N3, the emitter of the transistor switch N3 is grounded, the base of the transistor switch N3 is connected with the base of the transistor switch N3 as a control end, the emitter of the transistor switch N3 and the emitter of the transistor switch N3 are grounded, the collector of the transistor switch N3 is connected with one end of the resistor R3, the collector of the transistor switch P, the other end of the resistor R2 is connected with one end of a capacitor C1 and serves as a sampling end, the other end of the capacitor C1 and the emitter of a transistor switch N4 are grounded together, the base of the transistor switch N4 is connected with the base of a transistor switch N2 and serves as a second control end, and the collector of a transistor switch N4 is connected with the base of a transistor switch P2;
the low-level detection circuit comprises a probe Z2, a transistor switch N6, a transistor switch N7, a transistor switch N8, a transistor switch N9, a transistor switch P3, a transistor switch P4, a resistor R3, a resistor R4 and a capacitor C2, wherein a voltage source Vcc is connected to one end of the resistor R3, the other end of the resistor R2 is connected to the emitters of the transistor switch P3 and the transistor switch P4, the base of the transistor switch P3 is connected to the collector of the transistor switch N8, the collector of the transistor switch P8 is connected to one end of the probe Z8 and the collector of the transistor switch N8, the emitter of the transistor switch N8 is grounded, the base of the transistor switch N8 is connected to the base of the transistor switch N8 as a control terminal, the emitter of the transistor switch N8 and the emitter of the transistor switch N8 are grounded, the collector of the transistor switch N8 is connected to one end of the resistor R8, the collector of the transistor switch P, the other end of the resistor R4 is connected with one end of the capacitor C2 as a sampling end, the other end of the capacitor C2 and the emitter of the transistor switch N9 are commonly grounded, the base of the transistor switch N9 is connected with the base of the transistor switch N7 and serves as a second control end, and the collector of the transistor switch N9 is connected with the base of the transistor switch P4.
The control of the water pump motor is controlled by a relay K1.
The ACDC power circuit is a conventional isolated voltage circuit (e.g., a switching power supply), and is not considered as a protection point of this patent, and therefore is not specifically described. The purpose of adopting bridge type signal generation circuit is to reduce the electrochemical corrosion of probe, reduces the influence of incrustation scale simultaneously, can improve the life of probe greatly.
The two signal detection circuits have the same principle.
Take way 1 as an example.
When the probe is idle, both PB0 and PB1 output low levels, at the moment, two bridge arms of the bridge circuit are turned off, when no signal is detected on the probe, the PB0 outputs a low level PB1 to output a high level, at the moment, N1 and P1 are turned on (lower left, upper right), a signal is applied to the probe Z1, in the process, the signal is not detected, and in the process, the signal is output for time T1.
After the time, PB0 and PB1 both output low level, PB1 then outputs low level PB0 and high level, when N2 and P2 are on (top left, bottom right), probe Z1 is applied with inverted signal, and after waiting for time T1, signal detection is performed by using ADC (analog-to-digital conversion) channel AIN 0.
And after the monitoring is finished, the output is closed, and the process is repeated after waiting for a certain time.
As an example of practical application, T1 selects 10 ms, and detects 10 times per second, i.e. detects once every 100 ms and 20 ms for every time.
Specifically, reference is made to fig. 3, 4, 5 and 6. The utility model provides a immersible pump water shortage detection control method, the high-order detection circuitry is the same with the circuit connection structure of low level detection circuitry, including probe, four transistor switches, and probe and four transistor switches connect into bridge structure, and bridge structure has two control ends and a sampling end, and two control ends connect the input/output pin of singlechip respectively, and the sampling pin of singlechip is connected to the sampling end, and the singlechip includes following processing steps:
the method comprises the following steps: initializing configuration and starting timing;
step two: judging whether the running time reaches the detection time;
step three: when the detection time is up, entering a high-level detection circuit control step, entering a low-level detection circuit control step, entering a motor operation control step, and finally restarting timing;
step four: and when the detection time is not up, entering a motor operation control step, and then switching on and off the chamber again for timing.
As shown in fig. 4 and 5, the control steps of the high detection circuit and the low detection circuit are the same, and the method includes:
step 1.1: turning on a left-lower-right-upper bridge arm, delaying T1, turning off all bridge arms, turning on a left-upper-right-lower bridge arm, delaying T1, turning on ADC (analog to digital converter) detection, and recording probe results;
step 1.2: judging whether the probe result is greater than or equal to a threshold value P3;
step 1.3: step 1.2, judging that the water-containing times K return to zero, accumulating the anhydrous times M, judging whether the anhydrous times M are greater than a threshold value N, if so, setting an anhydrous mark, and if not, finishing detection;
step 1.4: step 1.2, judging that the water is false, enabling the anhydrous times M to return to zero, accumulating the water times K, judging whether the water times are greater than a threshold value N, setting a water mark if the water times are greater than the threshold value N, and finishing detection if the water times are less than the threshold value N.
Referring to fig. 6, the motor operation controlling step includes:
step 2.1, judging the state of the motor, timing the time A from the high water level to the low water level when the motor is started and the high water level state mark is judged to be anhydrous, storing the time A from the high water level to the low water level when the low water level state mark is judged to be anhydrous, closing the water pump and returning;
step 2.2, judging the state of the motor, timing the time B from the low water level to the high water level when the low water level state mark is judged to have water when the motor is not started, storing the time B from the low water level to the high water level when the high water level state mark is judged to have water, timing the motor stop time E, calculating that D is C multiplied by B/A-B, starting the water pump when E is larger than D, and returning;
step 3.3, when the motor is started, the high water level mark is water or the low water level mark is water, and the water returns directly; when the motor is turned off, the low water level mark is anhydrous, or the high water level mark is anhydrous, or E is not more than D, the motor returns directly.
The judging method comprises the following steps:
the dielectric resistance between resistor R1 and probe Z1 forms a voltage dividing relationship. If the water level is over Z1, the medium between Z1 is water, the resistance is small, the voltage after voltage division is low, and the generated ADC result is small and is marked as P1. If the water level is lower than Z1, the medium between Z1 is air, the resistance is large, the voltage after voltage division is high, and the generated ADC result is large and is marked as P2.
The software determines the current ADC result P in relation to P1 and P2. In general, the intermediate value P3 between P1 and P2 is taken as the threshold value for judgment. Based on the results of N successive monitoring. If P < P3 is continued N times, it indicates that there is water. If P ≧ P3 is continuously N times, it indicates no water, and if the number of times is not reached, the detection state is not changed between maintenance.
The control method comprises the following steps:
during the operation of the water pump, the time A used for the water level to fall from the high point to the low point is recorded. And after the water level is lower than the low point, the water pump stops running.
The water level begins to rise gradually, and the time B used by the water level from the low point to the high point is also recorded.
Assuming that the continuous operation time of the water pump after each turn-on is C, the waiting time D after the water level reaches the high water level is calculated by (formula 1), and D is C × B/A-B (formula 1)
For example, the time that the water level takes from the high point to the bottom point is 1 minute; the time from the low point to the high point of the water level is 10 minutes; the minimum continuous operation time of the water pump is 20 minutes; after the water level is higher than the highest point, the time D of continuing to wait for 20 × 10/1 — 20 × 180 (minutes) is needed, that is, after the water level reaches the high point, the water pump needs to wait for 180 minutes again, and then the water pump starts to operate, and the operation can be continued for about 20 minutes.
The above are only typical examples of the present invention, and besides, the present invention may have other embodiments, and all the technical solutions formed by equivalent substitutions or equivalent changes are within the scope of the present invention as claimed.
Claims (4)
1. The utility model provides a immersible pump water shortage detection control method, includes high-order detection circuitry, low level detection circuitry, singlechip and water pump motor control circuit, and high-order detection circuitry and low level detection circuitry are connected respectively on the singlechip, and a pin of singlechip is connected water pump motor control circuit in order to control the start-up and stop of water pump, characterized by, the circuit connection structure of high-order detection circuitry and low level detection circuitry is the same, including probe, four transistor switch, and probe and four transistor switch connect into bridge structure, bridge structure has two control ends and a sample site, and the input/output pin of singlechip is connected respectively to two control ends, and the sample site connects the sampling pin of singlechip, and the singlechip includes following processing steps:
the method comprises the following steps: initializing configuration and starting timing;
step two: judging whether the running time reaches the detection time;
step three: when the detection time is up, entering a high-level detection circuit control step, entering a low-level detection circuit control step, entering a motor operation control step, and finally restarting timing;
step four: and when the detection time is not up, entering a motor operation control step, and then switching on and off the chamber again for timing.
2. The submersible pump water shortage detection control method of claim 1, characterized in that: the high-level detection circuit comprises a probe Z1, a transistor switch N1, a transistor switch N2, a transistor switch N3, a transistor switch N4, a transistor switch P1, a transistor switch P2, a resistor R1, a resistor R2 and a capacitor C1, wherein a voltage source Vcc is connected with one end of a resistor R1, the other end of a resistor R1 is connected with emitters of a transistor switch P1 and a transistor switch P2, a base of a transistor switch P1 is connected with a collector of a transistor switch N3, a collector of a transistor switch P1 is connected with one end of the probe Z1 and a collector of a transistor switch N2, an emitter of the transistor switch N2 is grounded, a base of the transistor switch N2 is connected with a base of the transistor switch N2 to serve as a control end, an emitter of the transistor switch N2 and an emitter of the transistor switch N2 are grounded, and a collector of the transistor switch N2 is connected with one end of the resistor R, And a second terminal of the probe Z1, wherein the other terminal of the resistor R2 is connected with one terminal of a capacitor C1 and serves as a sampling terminal, the other terminal of the capacitor C1 and an emitter of a transistor switch N4 are commonly grounded, a base of a transistor switch N4 is connected with a base of a transistor switch N2 and serves as a second control terminal, and a collector of the transistor switch N4 is connected with a base of a transistor switch P2;
the low-level detection circuit comprises a probe Z2, a transistor switch N6, a transistor switch N7, a transistor switch N8, a transistor switch N9, a transistor switch P3, a transistor switch P4, a resistor R3, a resistor R4 and a capacitor C2, wherein a voltage source Vcc is connected with one end of a resistor R3, the other end of a resistor R2 is connected with emitters of a transistor switch P3 and a transistor switch P4, a base of a transistor switch P3 is connected with a collector of a transistor switch N8, a collector of a transistor switch P3 is connected with one end of the probe Z2 and a collector of a transistor switch N7, an emitter of the transistor switch N7 is grounded, a base of the transistor switch N7 is connected with a base of the transistor switch N7 to serve as a control end, an emitter of the transistor switch N7 and an emitter of the transistor switch N7 are grounded, and a collector of the transistor switch N7 is connected with one end of the resistor R, And a second terminal of the probe Z2, wherein the other terminal of the resistor R4 is connected with one terminal of a capacitor C2 and serves as a sampling terminal, the other terminal of the capacitor C2 and an emitter of a transistor switch N9 are commonly grounded, a base of a transistor switch N9 is connected with a base of a transistor switch N7 and serves as a second control terminal, and a collector of the transistor switch N9 is connected with a base of a transistor switch P4.
3. The submersible pump water shortage detection control method of claim 1, characterized in that: the control steps of the high-order detection circuit and the low-order detection circuit are the same, and the method comprises the following steps:
step 1.1: turning on a left-lower-right-upper bridge arm, delaying T1, turning off all bridge arms, turning on a left-upper-right-lower bridge arm, delaying T1, turning on ADC (analog to digital converter) detection, and recording probe results;
step 1.2: judging whether the probe result is greater than or equal to a threshold value P3;
step 1.3: step 1.2, judging that the water-containing times K return to zero, accumulating the anhydrous times M, judging whether the anhydrous times M are greater than a threshold value N, if so, setting an anhydrous mark, and if not, finishing detection;
step 1.4: step 1.2, judging that the water is false, enabling the anhydrous times M to return to zero, accumulating the water times K, judging whether the water times are greater than a threshold value N, setting a water mark if the water times are greater than the threshold value N, and finishing detection if the water times are less than the threshold value N.
4. The submersible pump water shortage detection control method of claim 3, characterized in that: the motor operation control step comprises:
step 2.1, judging the state of the motor, timing the time A from the high water level to the low water level when the motor is started and the high water level state mark is judged to be anhydrous, storing the time A from the high water level to the low water level when the low water level state mark is judged to be anhydrous, closing the water pump and returning;
step 2.2, judging the state of the motor, timing the time B from the low water level to the high water level when the low water level state mark is judged to have water when the motor is not started, storing the time B from the low water level to the high water level when the high water level state mark is judged to have water, timing the motor stop time E, calculating that D is C multiplied by B/A-B, starting the water pump when E is larger than D, and returning;
step 3.3, when the motor is started, the high water level mark is water or the low water level mark is water, and the water returns directly; when the motor is turned off, the low water level mark is anhydrous, or the high water level mark is anhydrous, or E is not more than D, the motor returns directly.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350729.1A CN113027784B (en) | 2021-03-31 | 2021-03-31 | Water shortage detection control method for submersible pump |
| PCT/CN2021/115690 WO2022205766A1 (en) | 2021-03-31 | 2021-08-31 | Water shortage detection and control method for submersible pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110350729.1A CN113027784B (en) | 2021-03-31 | 2021-03-31 | Water shortage detection control method for submersible pump |
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| CN113027784A true CN113027784A (en) | 2021-06-25 |
| CN113027784B CN113027784B (en) | 2022-04-22 |
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| WO (1) | WO2022205766A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022205766A1 (en) * | 2021-03-31 | 2022-10-06 | 浙江大元泵业股份有限公司 | Water shortage detection and control method for submersible pump |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4742244A (en) * | 1986-10-15 | 1988-05-03 | Itt Avionics | Electronic float switch apparatus |
| CN2864162Y (en) * | 2005-12-30 | 2007-01-31 | 莫国荣 | Water pump with self control device |
| CN201435012Y (en) * | 2009-05-18 | 2010-03-31 | 何竞 | Intelligent water level controller |
| CN103134566A (en) * | 2011-11-30 | 2013-06-05 | 罗红光 | Water level detecting circuit based on capacitance principle |
| CN204695120U (en) * | 2015-06-18 | 2015-10-07 | 长春黄金研究院 | A kind of liquid-level auto-control device |
| CN208171380U (en) * | 2018-03-16 | 2018-11-30 | 依莱克顿(宁波)电器科技有限公司 | A kind of water level detection circuit of water dispenser |
| CN209041134U (en) * | 2018-10-10 | 2019-06-28 | 深圳市金灿宠物用品有限公司 | A kind of immersible pump with water level detecting |
| CN209372183U (en) * | 2019-02-19 | 2019-09-10 | 河北中瓷电子科技股份有限公司 | A kind of water level sensor |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1313497A (en) * | 1969-08-15 | 1973-04-11 | Lucas Industries Ltd | Liquid level detection circuits |
| US4766329A (en) * | 1987-09-11 | 1988-08-23 | Elias Santiago | Automatic pump control system |
| CN1699756A (en) * | 2005-07-15 | 2005-11-23 | 陈俊平 | Control method and control device for evacuation automatic protection for submersible pump |
| CN2908866Y (en) * | 2006-04-26 | 2007-06-06 | 黄柏儒 | Submerged pump with power-off protector when water-break |
| CN201593510U (en) * | 2009-12-25 | 2010-09-29 | 中冶天工建设有限公司 | Automatic submersible pump control circuit for water level lowering in water well |
| CN103676988B (en) * | 2013-12-27 | 2016-09-28 | 深圳市得汛科技有限公司 | A kind of water level detecting and controlling circuit being applicable to draining pump and method of work thereof |
| CN104141617A (en) * | 2014-07-30 | 2014-11-12 | 苏州淮通电气有限公司 | Submersible pump capable of warning about water shortage |
| CN107588014B (en) * | 2017-07-28 | 2019-06-07 | 江苏苏华泵业有限公司 | A kind of Intelligent submersible pump |
| CN113027784B (en) * | 2021-03-31 | 2022-04-22 | 浙江大元泵业股份有限公司 | Water shortage detection control method for submersible pump |
-
2021
- 2021-03-31 CN CN202110350729.1A patent/CN113027784B/en active Active
- 2021-08-31 WO PCT/CN2021/115690 patent/WO2022205766A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4742244A (en) * | 1986-10-15 | 1988-05-03 | Itt Avionics | Electronic float switch apparatus |
| CN2864162Y (en) * | 2005-12-30 | 2007-01-31 | 莫国荣 | Water pump with self control device |
| CN201435012Y (en) * | 2009-05-18 | 2010-03-31 | 何竞 | Intelligent water level controller |
| CN103134566A (en) * | 2011-11-30 | 2013-06-05 | 罗红光 | Water level detecting circuit based on capacitance principle |
| CN204695120U (en) * | 2015-06-18 | 2015-10-07 | 长春黄金研究院 | A kind of liquid-level auto-control device |
| CN208171380U (en) * | 2018-03-16 | 2018-11-30 | 依莱克顿(宁波)电器科技有限公司 | A kind of water level detection circuit of water dispenser |
| CN209041134U (en) * | 2018-10-10 | 2019-06-28 | 深圳市金灿宠物用品有限公司 | A kind of immersible pump with water level detecting |
| CN209372183U (en) * | 2019-02-19 | 2019-09-10 | 河北中瓷电子科技股份有限公司 | A kind of water level sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022205766A1 (en) * | 2021-03-31 | 2022-10-06 | 浙江大元泵业股份有限公司 | Water shortage detection and control method for submersible pump |
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| Publication number | Publication date |
|---|---|
| CN113027784B (en) | 2022-04-22 |
| WO2022205766A1 (en) | 2022-10-06 |
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