CN112539182B - Detection method for water shortage protection of constant-pressure variable-frequency water pump - Google Patents
Detection method for water shortage protection of constant-pressure variable-frequency water pump Download PDFInfo
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- CN112539182B CN112539182B CN202011431609.6A CN202011431609A CN112539182B CN 112539182 B CN112539182 B CN 112539182B CN 202011431609 A CN202011431609 A CN 202011431609A CN 112539182 B CN112539182 B CN 112539182B
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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
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
Abstract
The invention belongs to the technical field of water shortage protection of water pumps, and particularly relates to a water pump water shortage protection deviceThe controller of the water pump is internally provided with the maximum operating frequency S of the water pump 1 (ii) a A trigger frequency A for triggering water shortage protection is set in the controller of the water pump; the trigger frequency A is the maximum running frequency S 1 At-2 Hz, i.e. A ═ S 1 -2; the operation frequency of the controller for currently controlling the operation of the water pump driving motor is set as S 2 Said S 2 When the water content is more than or equal to A, triggering a detection mechanism of the controller to enter a water shortage protection detection state; said S 2 When the water pump runs below the preset value A, the controller does not act, and the water pump keeps running; the detection method for water shortage protection has the advantages of low detection cost, high reliability and quick response.
Description
Technical Field
The invention belongs to the technical field of water shortage protection of water pumps, and particularly relates to a detection method for water shortage protection of a constant-pressure variable-frequency water pump.
Background
Domestic frequency conversion water pump and commercial frequency conversion water pump on the present market all have configured dedicated controller to this comes the control motor to drive the water pump, uses pressure sensor as signal feedback to satisfy user's constant voltage water demand through PID control algorithm. The water shortage protection is used as a protection function which is most commonly and necessarily used in water pump application, and can automatically identify the water cut-off state and stop in time to prevent the water pump from running dry and prolong the service life when water is cut off. In the design of the function, the following means are often adopted in the prior art:
the current for detecting the running of the motor is increased, and if the current is lower than a certain set value, water shortage is judged;
the wall-section component detects the pressure of a water outlet through a pressure sensor, and if the pressure is lower than a certain set value, the wall-section component is judged to be in water shortage;
⒊ detecting motor current and water outlet pressure at the same time, if the two conditions are satisfied at the same time, judging that there is water shortage;
the above detection means have a great disadvantage of low detection accuracy and easy report omission, that is, the water shortage state cannot be truly detected. Because, in practical application, a part of pipelines can be provided with check valves or bottom valves, so that water backflow in the pipelines is avoided when the machine is stopped, and the pressure sensors are often arranged at the rear ends of the check valves of the water outlet pipelines.
Thus, when a water shortage condition occurs, there will be several situations:
the hydraulic pressure in the pipeline is kept due to the action of the check valve, and the pressure detected by the pressure sensor exceeds a protected pressure value;
the no-load current of the component asynchronous motor is large, and the running current is possibly larger than the set protection current due to the current error caused by the mechanical structure of a pump body or water stains;
⒊ in constant voltage mode, when the motor is in low speed due to too low set pressure, the current drop of motor operation may be lower than the set current protection value to cause false alarm;
⒋ due to the action of the bottom valve of part of the water pump, water which is not thrown out may exist in the pump cavity after water supply is cut off, and the running current of the water pump is close to the no-load current;
the water shortage protection can not play a role in protection under the conditions, the water pump always runs at a high speed, and the internal sealing structure is in a dry grinding or semi-dry grinding state, so that the service life of the water pump is influenced, electricity is consumed, and redundant social resource waste is generated.
Disclosure of Invention
The invention provides a detection method for water shortage protection of a constant-pressure variable-frequency water pump, which aims to make up for the defects of the prior art and solve the problems that the detection accuracy of the existing water shortage protection is low and the alarm is easy to miss.
The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a method for detecting water shortage protection of a constant-pressure variable-frequency water pump, wherein the controller of the constant-pressure variable-frequency water pump is internally provided with the maximum operating frequency S of the water pump 1 (ii) a A trigger frequency A for triggering water shortage protection is set in the controller of the constant-pressure variable-frequency water pump; the trigger frequency A is equal to the maximum operation frequency S 1 -2Hz, i.e. A ═ S 1 -2; the operation frequency of the controller for currently controlling the operation of the water pump driving motor is set as S 2 (ii) a The maximum operating frequency S 1 Under the condition that the water pump is in a constant pressure mode and the water in the pump cavity of the water pump is in a water shortage state, before the pressure set by the controller is not reached, the controller controls the frequency of the full-speed running of the water pump driving motor; what is needed isThe pump cavity of the water pump is in a water shortage state, and the running frequency S of the controller 2 Greater than or equal to the trigger frequency A, i.e. S 2 When the water content is more than or equal to A, triggering a detection mechanism of the controller to enter a water shortage protection detection state; the controller operating frequency S 2 Less than the trigger frequency A, i.e. S 2 When the water flow rate is less than A, the controller does not act, and the water pump keeps the running state unchanged;
when the water pump works, after a water shortage state occurs in a pump cavity of the water pump, the pressure in the pipe network is reduced, the controller controls the running frequency of the water pump driving motor to be increased so as to cause the water pump to run in the water shortage state, an internal sealing structure of the water pump is in a dry grinding or semi-dry grinding state, the service life of the water pump is influenced, electricity is consumed, and redundant social resource waste is generated, meanwhile, when the constant-pressure variable-frequency water pump runs in the water shortage state, the running frequency of the controller is increased, and the current running frequency of the water pump driving motor is close to or equal to the maximum running frequency, therefore, the controller finishes the judgment of the current state of the water pump by judging the current running frequency of the water pump driving motor and the triggering frequency, ensures that the controller is triggered in time and enters a water shortage protection detection state when the water pump runs in the water shortage state for a long time, and avoids the water pump running in the water shortage state for a long time, the service life of the water pump is prolonged, and energy waste is reduced.
Preferably, after the controller enters the water shortage protection detection, the controller detects the water outlet pressure of the water pump through the pressure sensor; the pressure sensor is arranged on a pipeline close to the water outlet of the water pump in the pipe network, and a pressure tank for maintaining stable pressure of the pipe network is arranged on the pipeline; the controller completes primary water pump outlet pressure detection at intervals of 2 ms; a judgment condition B is set in the controller; the judgment condition B is the secondary pressure detection value P 1 And last pressure detection value P 2 The absolute value of the difference between them, i.e. B ═ P 1 -P 2 L, |; a counting condition T is set in the controller, and the initial value of the counting condition T is equal to 0; when the value of the judgment condition B is equal to 0, the value of the counting condition is added with 1, namely when B is equal to 0, T is equal to T + 1; when the value of the counting condition T is equal to 10, the controller judges that the water outlet pressure of the water pump is unchangedMelting; when the value of the judgment condition B is larger than 0, resetting the value of the counting condition T, namely B > 0, and T is 0; after the value of the counting condition T is cleared, the controller continues to circularly generate and judge the value of the judging condition B;
when the water pump works, when the water pump is in normal water supply, the pressure signal fed back by the pressure sensor in a microscopic angle is in an up-and-down fluctuation state, namely B is more than 0, the value of the counting condition T is cleared, and the controller can continue to circularly detect the pressure of the water outlet; when the water pump is in a water shortage state, the pressure signal fed back by the pressure sensor is kept unchanged, namely B is 0, after the circulation counting, the counting condition T is 10, and the controller judges that the water outlet pressure of the water pump is unchanged.
Preferably, the controller is internally provided with the current running current I of the water pump driving motor 1 (ii) a A water shortage protection current I of a water pump driving motor is set in the controller 2 (ii) a The controller is internally provided with a water pump driving motor with the running current I when the water pump is at the maximum flow 3 (ii) a The water shortage protection current I 2 The running current I of the water pump driving motor is smaller than that of the water pump at the maximum flow point 3 I.e. I 2 ＜I 3 (ii) a When the value of the counting condition T is equal to 10, the controller compares the current running current I before judging that the pressure of the water outlet of the water pump is unchanged and the controller executes the action of water shortage protection 1 With protective current I for water shortage 2 The size of (d); the running current I 1 < water shortage protection Current I 2 I.e. I 1 ＜I 2 When the water pump is in a serious water shortage state, the controller executes water shortage protection action and cuts off the power supply of the water pump driving motor; the running current I 1 Protection current I for more than 2 I.e. I 1 ﹥I 2 When the water pump is in the high-flow water using state, the controller does not act, and the water pump keeps the running state unchanged;
in operation, when the controller controlling the water pump operates the current I for the water pump drive motor after the value of the counting condition T is equal to 10 1 With protective current I for water shortage 2 Comparing the sizes of the two components; said I 1 ＜I 2 When the water pump runs, the load is too low, and the running current I of the water pump driving motor is too low 1 When the water pump is too small, the controller judges that the water pump is in a serious water shortage state, the controller executes water shortage protection action, and a power supply of the water pump is disconnected, so that the water pump is prevented from running in the water shortage state for a long time, and the service life of the water pump is shortened; when the water outlet in the pipe network is fully opened, the pressure in the pipe network is reduced, the running frequency of the water pump driving motor is increased, the pressure at the water outlet of the water pump is unchanged, the water pump supplements water flow for the pipe network, at the moment, the water pump has a certain load, most space in the pump cavity of the water pump is immersed by the water flow, the water pump is in a large-flow water using state, and meanwhile, the running current I of the water pump driving motor is reduced 1 With protective current I for water shortage 2 Comparison of the magnitudes of (A) to (B) yields I 1 ﹥I 2 The controller judges that the water pump is replenishing water for the pipe network, the water pump is in a large-flow water using state, the controller does not act, the running state of the water pump is kept unchanged, and meanwhile, the running current I of the water pump driving motor is controlled 1 With protective current I for water shortage 2 The water supply controller can distinguish the real water shortage state of the water pump from the water supply state of the water pump for the pipe network, the misjudgment of the controller on the state that the absolute value of the pressure variation at the water outlet of the water pump is zero due to the fact that the water outlet of the pipe network is completely opened when the water pump supplies water for the pipe network is avoided, the control accuracy of the water supply controller for water shortage protection of the water pump is improved, and the misreport and the missing report are avoided, so that the water supply fault of the pipe network is caused.
Preferably, a detection device is included; the detection device is fixedly arranged on the water pump; the water pump comprises a motor, a first pump shell, a second pump shell and an impeller; the first pump shell is fixedly arranged on the motor; the pump shell two-way is fixedly arranged on the pump shell one through bolts; an output shaft of the motor extends into a space formed by the first pump shell and the second pump shell; an impeller is fixedly arranged on an output shaft of the motor; a water inlet is formed in the side surface of the outer side of the pump shell II, which is mutually connected with the output shaft of the motor; the central line of the water inlet is superposed with the central line of the impeller; a water outlet is fixedly arranged on the circumferential surface of the outer side of the second pump shell along the tangential direction; the detection device comprises a first polar plate and a second polar plate; the second polar plate is fixedly arranged on the first pump shell; the first polar plate is fixedly arranged on the second pump shell; the first polar plate is opposite to the second polar plate, and the first polar plate and the second polar plate are respectively positioned on the mutually opposite side surfaces of the first pump shell and the second pump shell; the impeller is positioned between the first polar plate and the second polar plate; a shifting plate is arranged inside the impeller; the poking plates are uniformly distributed in the impeller; the area of the first polar plate opposite to the second polar plate is equal to the area of the second polar plate; when the impeller rotates, only one shifting plate exists in the area opposite to the first polar plate and the second polar plate in the same time; a first pole plate and a second pole plate in the detection device form a capacitor and are electrically connected with a controller for controlling the operation of the water pump;
when the water pump works, the impeller in a space formed by the pump shell I and the pump shell II continuously rotates to convey water flow, meanwhile, as the stirring plates are arranged on the impeller and the thicknesses of all parts of the impeller are the same, the relative volume of the impeller is larger at the positions where the stirring plates are arranged on the impeller, more materials are used, when the impeller rotates between the polar plate I and the polar plate II, the stirring plates on the impeller enter the area opposite to the polar plate I and the polar plate II, the substances entering the space between the polar plate I and the polar plate II are increased, the capacitance is determined by the capacitance, the increased volume is equivalent to the increase of a dielectric medium between the two polar plates of a capacitor, the capacitance is increased, the periodic change of the capacitance formed by the polar plate I and the polar plate II detected by the controller in a certain range is caused, the frequency of the change of the capacitance is obtained, and meanwhile, the impeller is connected with an output shaft of the motor, the impeller and the motor rotate synchronously, so that the obtained frequency of capacitance value change is the running frequency S 2 Meanwhile, when the running frequency S2 obtained by detecting the change of the capacitance value is greater than or equal to the trigger frequency A, the controller is triggered and enters a water shortage protection detection state, meanwhile, the running frequency obtained by detecting the change of the capacitance value is compared with the running frequency obtained by detecting the controller, when the deviation between the two is overlarge, an alarm is given out, when the controller is prevented from being broken down, the actual running frequency of the water pump driving motor is detected to be wrong or larger, the controller is caused to execute a water shortage protection action mistakenly, and a water supply fault of a pipe network is caused.
Preferably, the space formed by the pump shell I and the pump shell II is filled with water flow, namely when the water pump operates normally, water flow exists between the polar plate I and the polar plate II; the capacitance value when water flow exists between the first polar plate and the second polar plate is set to be C 1 And the capacitance value when no water flow exists between the first polar plate and the second polar plate is set as C 2 (ii) a The controller controls the actual capacitance C of the capacitor formed by the first pole plate and the second pole plate in the running process of the water pump 3 And C 1 And C 2 Carrying out comparison; said C is 3 ＝C 1 When the water pump is in a water-deficient running state, the controller judges that the space formed by the first pump shell and the second pump shell is full of water flow, namely the water pump is not in the water-deficient running state; said C is 3 ＝C 2 When the water pump is in the water-deficient running state, the controller triggers and enters the water-deficient protection detection state to start to operate the running frequency S 2 Comparing with a trigger frequency A;
when the water-shortage protection device works, the actual capacitance value of the capacitor formed by the first pole plate and the second pole plate is compared with the capacitance values of the first pole plate and the second pole plate in two different states of water existence and no water existence, and the water shortage state in the pump cavity of the water pump is determined between the water shortage protection actions executed by the controller, so that the situation that the water supply stability is influenced due to misjudgment or missing judgment of the controller is avoided.
Preferably, a movable groove is formed in the second pump shell; a first guide groove is formed in the side wall of the movable groove; a movable plate is arranged in the movable groove in a sliding manner; a guide bulge is arranged on the side surface of the movable plate; the guide protrusion is inserted into the first guide groove and slides in the first guide groove; the second pump shell is provided with a mounting groove; the second polar plate is fixedly arranged in the mounting groove; the movable plate extends out of the movable groove and then enters the mounting groove; the surface of the movable plate is flush with the surface of the second pump shell; the distance between the first polar plate and the first pump shell is greater than the distance between the movable plate and the first pump shell; the first polar plate is positioned below the second movable plate; a gap is formed between the lower surface of the movable plate and the bottom surface of the movable groove; an air bag is fixedly arranged in the movable groove; a pushing plate is fixedly arranged at one end of the movable plate far away from the mounting groove; the pushing plate is contacted with the bottom surface of the movable groove and is vertical to the bottom surface of the movable groove; an elastic column is fixedly arranged on the side surface of the pushing plate; the other end of the elastic column is fixedly connected to the side wall of the movable groove far away from the mounting groove; the elastic column has thrust to the push plate in the direction pointing to the mounting groove; the air bag is filled with air, and the distance between the air bag and the mounting groove is smaller than the distance between the pushing plate and the mounting groove; the air bag has thrust towards the direction far away from the mounting groove on the push plate; the movable plate is only positioned in the movable groove under the normal state, does not enter the mounting groove and reaches the upper part of the first polar plate; the movable plate is made of plastic materials, and a proper amount of ceramic micro powder is packaged in the movable plate; the dielectric constant of the ceramic micro powder is obviously greater than that of the water flow and the impeller; a polytetrafluoroethylene waterproof layer is sprayed on the surfaces of the movable plate, the pushing plate, the movable groove and the air bag;
when the pump works, when positive pressure exists in a pump cavity formed by the pump shell I and the pump shell II, when the water pump keeps supplying water, the air bag in the movable groove is under the action of pressure and is extruded and reduced, meanwhile, because the air bag has pushing action force on the push plate, after the air bag is reduced, the action force of the air bag on the push plate is reduced, the push plate moves towards the direction of the mounting groove under the action of the elastic column, so as to drive the movable plate to enter the mounting groove, meanwhile, because the movable plate is internally sealed with ceramic micro powder with large dielectric constant, after the movable plate enters the mounting groove, namely, the movable plate is positioned in the area opposite to the polar plate I and the polar plate II, the capacitance value of the capacitor formed by the polar plate I and the polar plate II is changed, under different pressures obtained through measurement in advance, the capacitance value of the capacitor formed by the polar plate I and the polar plate II is changed when the movable plate enters the mounting groove, the controller obtains pressure numerical value through the corresponding relation between capacitance value and the pressure, promotes the accuracy of controller control water pump water shortage protection, simultaneously, through the ceramic miropowder that the encapsulation dielectric constant is big in the fly leaf, can increase the capacitance value degree of change of the capacitor of polar plate one and polar plate two components to reduce the error, promote the measurement accuracy to water pump pressure, promote the control accuracy of controller.
The invention has the following beneficial effects:
1. according to the detection method for the water shortage protection of the constant-pressure variable-frequency water pump, the operation frequency of a current controller is used as trigger, the pressure value fed back by a pressure sensor and the current operation current are used as condition judgment, the purpose of detecting the water shortage of the water pump is achieved through a software algorithm, the condition of false alarm and missing report is avoided, extra accessories are not needed, the detection cost is reduced, and the cost performance of products is improved; meanwhile, the invention fully considers the complex application scene, so that the protection is more effective, and the false alarm and the missing report are reduced; meanwhile, the invention improves the reliability, service life and user experience of the product, and saves social resources; meanwhile, the detection time of the invention is ms grade, the response is quick, and the dry grinding time of the water pump in water shortage is reduced.
2. According to the method for detecting the water shortage protection of the constant-pressure variable-frequency water pump, the polar plate I, the polar plate II, the movable plate, the pushing plate, the air bag and the impeller are arranged, and meanwhile, the running frequency of the water pump, whether water is in a pump cavity of the water pump or not and the pressure of the water pump can be detected through the matching among the accessories, so that the existing accessories can be utilized as much as possible, more data can be detected, and the cost expenditure of the accessories is reduced.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of an example of a method for detecting water shortage protection of a constant-pressure variable-frequency water pump according to the present invention;
FIG. 2 is a schematic diagram of a conventional application of the method for detecting water shortage protection of the constant-pressure variable-frequency water pump of the invention;
FIG. 3 is a schematic view of the structure of a water pump with a detection device installed therein according to the present invention;
FIG. 4 is a schematic structural view of a second pump housing of the water pump with the detection device of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4 at A;
in the figure: the device comprises a motor 1, a first pump shell 2, a second pump shell 3, a movable groove 31, a water inlet 4, a water outlet 5, an impeller 6, a shifting plate 61, a first polar plate 7, a second polar plate 8, a movable plate 9, a guide bulge 91, a pushing plate 92, an elastic column 921 and an air bag 93.
Detailed Description
The present invention will be further described with reference to the following detailed description so that the technical means, the creation features, the achievement purposes and the effects of the present invention can be easily understood.
As shown in fig. 1 to 5, in the method for detecting water shortage protection of a constant-pressure variable-frequency water pump according to the present invention, a controller of the constant-pressure variable-frequency water pump is provided with a maximum operating frequency S of the water pump 1 (ii) a A trigger frequency A for triggering water shortage protection is set in the controller of the constant-pressure variable-frequency water pump; the trigger frequency A is the maximum running frequency S 1 -2Hz, i.e. A ═ S 1 -2; the operation frequency of the controller for currently controlling the operation of the water pump driving motor is set as S 2 (ii) a The maximum operating frequency S 1 Under the condition that the water pump is in a constant-pressure mode and the water in the pump cavity of the water pump is in a water shortage state, and before the set pressure of the controller is not reached, the controller controls the frequency of the full-speed running of the water pump driving motor; the pump cavity of the water pump is in a water shortage state, and the running frequency S of the controller 2 Greater than or equal to the trigger frequency A, i.e. S 2 When the water content is more than or equal to A, triggering a detection mechanism of the controller to enter a water shortage protection detection state; the controller operating frequency S 2 Less than the trigger frequency A, i.e. S 2 When the water pump runs below the preset value A, the controller does not act, and the water pump keeps running;
when the water pump works, after a water shortage state occurs in a pump cavity of the water pump, the pressure in the pipe network is reduced, the controller controls the running frequency of the water pump driving motor to be increased so as to cause the water pump to run in the water shortage state, an internal sealing structure of the water pump is in a dry grinding or semi-dry grinding state, the service life of the water pump is influenced, electricity is consumed, and redundant social resource waste is generated, meanwhile, when the constant-pressure variable-frequency water pump runs in the water shortage state, the running frequency of the controller is increased, and the current running frequency of the water pump driving motor is close to or equal to the maximum running frequency, therefore, the controller finishes the judgment of the current state of the water pump by judging the current running frequency of the water pump driving motor and the triggering frequency, ensures that the controller is triggered in time and enters a water shortage protection detection state when the water pump runs in the water shortage state for a long time, and avoids the water pump running in the water shortage state for a long time, the service life of the water pump is prolonged, and energy waste is reduced.
As an embodiment of the invention, after the controller enters the water shortage protection detection and before the power supply of the water pump is cut off, the controller detects the pressure of the water outlet 5 of the water pump through the pressure sensor; the controller completes the pressure detection of a water outlet 5 of the primary water pump at intervals of 2 ms; a judgment condition B is set in the controller; the judgment condition B is the secondary pressure detection value P 1 And last pressure detection value P 2 The absolute value of the difference between, i.e. B ═ P 1 -P 2 L, |; a counting condition T is set in the controller, and the initial value of the counting condition T is equal to 0; when the value of the judgment condition B is equal to 0, the value of the counting condition is added with 1, namely when B is equal to 0, T is equal to T + 1; when the value of the counting condition T is equal to 10, the controller judges that the pressure of the water outlet 5 of the water pump is unchanged; when the value of the judgment condition B is larger than 0, resetting the value of the counting condition T, namely B is larger than 0, and T is 0; after the value of the counting condition T is cleared, the controller continues to circularly generate and judge the value of the judging condition B;
when the water pump works, when the water pump is in normal water supply, the pressure signal fed back by the pressure sensor at the microscopic angle is in an up-and-down fluctuation state, namely B is greater than 0, the value of the counting condition T is cleared, and the controller can continue to circularly detect the pressure of the water outlet; when the water pump is in a water shortage state, the pressure signal fed back by the pressure sensor is kept unchanged, namely B is 0, after the circulation counting is carried out, the counting condition T is 10, and the controller judges that the pressure of the water outlet of the water pump is unchanged.
As an embodiment of the invention, the controller is internally provided with the current running current I of the water pump driving motor 1 (ii) a A water shortage protection current I of a water pump driving motor is set in the controller 2 (ii) a The controller is internally provided with a water pump driving motor with the running current I when the water pump is at the maximum flow 3 (ii) a The water shortage protection current I 2 Water pump smaller than when the water pump is at maximum flow pointDriving motor running current I 3 I.e. I 2 ＜I 3 (ii) a When the value of the counting condition T is equal to 10, the controller compares the current running current I before judging that the pressure of the water outlet of the water pump is unchanged and the controller executes the action of water shortage protection 1 And water shortage protection current I 2 The size of (d); the operating current I 1 < protection current in absence of water I 2 I.e. I 1 ＜I 2 When the water pump is in a serious water shortage state, the controller executes water shortage protection action and cuts off the power supply of the water pump driving motor; the running current I 1 Protection current I for more than 2 I.e. I 1 ﹥I 2 When the water pump is in the high-flow water using state, the controller does not act, and the water pump keeps the running state unchanged;
in operation, when the controller controlling the water pump operates the current I for the water pump drive motor after the value of the counting condition T is equal to 10 1 With protective current I for water shortage 2 Comparing the sizes of the two components; said I 1 ＜I 2 When the water pump runs, the load is too low, and the running current I of the water pump driving motor is too low 1 When the water pump is too small, the controller judges that the water pump is in a serious water shortage state, the controller executes water shortage protection action, and a power supply of the water pump is disconnected, so that the water pump is prevented from running in the water shortage state for a long time, and the service life of the water pump is shortened; when the water outlet 5 in the pipe network is fully opened, the pressure in the pipe network is reduced, the operating frequency of the water pump driving motor is increased, the pressure at the water outlet 5 of the water pump is unchanged, the water pump supplements water flow for the pipe network, at the moment, the water pump has a certain load, most space in the pump cavity of the water pump is immersed by the water flow, the water pump is in a large-flow water using state, and meanwhile, the operating current I of the water pump driving motor is reduced 1 With protective current I for water shortage 2 Comparison of the magnitudes of (A) to (B) yields I 1 ﹥I 2 And as a result, the controller judges that the water pump is replenishing water for the pipe network, the water pump is in a large-flow water consumption state, and meanwhile, the running current I of the water pump driving motor is controlled 1 With protective current I for water shortage 2 Can compare the real water shortage state of the water pump with the waterThe pump distinguishes for the pipe network moisturizing state, avoids the controller when the water pump carries out the moisturizing for the pipe network, because pipe network delivery port 5 is opened completely, arouses that the absolute value of 5 department's pressure variations of water pump delivery port is the erroneous judgement under the state for zero, and the control accuracy of promotion controller to water pump water shortage protection avoids the error to report, misses and reports, leads to pipe network water supply trouble.
The invention comprises a detection device as one embodiment of the invention; the detection device is fixedly arranged on the water pump; the water pump comprises a motor 1, a first pump shell 2, a second pump shell 3 and an impeller 6; the pump shell I2 is fixedly arranged on the motor 1; the second pump shell 3 is fixedly arranged on the first pump shell 2 through bolts; an output shaft of the motor 1 extends into a space formed by the pump shell I2 and the pump shell II 3; an impeller 6 is fixedly arranged on an output shaft of the motor 1; a water inlet 4 is formed in the side surface of the outer side of the pump shell II 3, which is mutually connected with the output shaft of the motor 1; the central line of the water inlet 4 is superposed with the central line of the impeller 6; a water outlet 5 is fixedly arranged on the circumferential surface of the outer side of the pump shell II 3 along the tangential direction; the detection device comprises a first polar plate 7 and a second polar plate 8; the second polar plate 8 is fixedly arranged on the first pump shell 2; the first polar plate 7 is fixedly arranged on the second pump shell 3; the first polar plate 7 is opposite to the second polar plate 8, and the first polar plate and the second polar plate are respectively positioned on the side faces, opposite to each other, of the first pump shell 2 and the second pump shell 3; the impeller 6 is positioned between the first polar plate 7 and the second polar plate 8; a poking plate 61 is arranged inside the impeller 6; the poking plates 61 are uniformly distributed in the impeller 6; the area of the first polar plate 7 opposite to the area of the second polar plate 8 is equal; when the impeller 6 rotates, only one shifting plate 61 exists in the area opposite to the polar plate I7 and the polar plate II 8 in the same time; a first pole plate 7 and a second pole plate 8 in the detection device form a capacitor and are electrically connected with a controller for controlling the operation of the water pump;
when the water pump works, when the water pump runs, the impeller 6 in a space formed by the pump shell I2 and the pump shell II 3 continuously rotates to convey water flow, meanwhile, the impeller 6 is provided with the shifting plate 61, and the thicknesses of all parts of the impeller 6 are the same, so that the shifting plate 61 on the impeller 6 is located, the impeller 6 is large in relative volume, more materials are used, and when the impeller 6 rotates between the polar plate I7 and the polar plate II 8, the impeller 6 is provided with the shifting plate 61, and when the impeller 6 rotates between the polar plate I8 and the polar plate II 7, the impeller 6 is provided with the shifting plate 61 on the impeller 6When the dial plate 61 enters the area right opposite to the first pole plate 7 and the second pole plate 8, the substances entering between the first pole plate 7 and the second pole plate 8 are increased, the capacitance is obtained through a capacitance determining formula, the increased volume is equivalent to the increase of a dielectric medium between the two pole plates of the capacitance, the capacitance is increased, the capacitance formed by the first pole plate 7 and the second pole plate 8 detected by a controller is periodically changed within a certain range, the frequency of the change of the capacitance is obtained, meanwhile, the impeller 6 and the motor 1 synchronously rotate due to the fact that the impeller 6 is connected with the output shaft of the motor 1, and therefore the obtained frequency of the change of the capacitance is the operation frequency S 2 (ii) a Meanwhile, when the operation frequency S2 obtained by detecting the change of the capacitance value is greater than or equal to the trigger frequency A, the controller is triggered and enters a water shortage protection detection state, meanwhile, the operation frequency obtained by detecting the change of the capacitance value is compared with the operation frequency obtained by detecting the controller, when the deviation between the two is overlarge, an alarm is given out, and when the controller breaks down, the actual operation frequency of the water pump driving motor is detected to have errors or larger errors, so that the controller executes a water shortage protection action mistakenly, and a water supply fault of a pipe network is caused.
As an implementation mode of the invention, a space formed by the pump shell I2 and the pump shell II 3 is filled with water flow, namely, when the water pump runs normally, water flow exists between the polar plate I7 and the polar plate II 8; the capacitance value when water flow exists between the first polar plate 7 and the second polar plate 8 is set to be C 1 And the capacitance value when no water flow exists between the first polar plate 7 and the second polar plate 8 is set as C 2 (ii) a The controller controls the actual capacitance C of the capacitor formed by the first pole plate 7 and the second pole plate 8 in the running process of the water pump 3 And C 1 And C 2 Carrying out comparison; said C is 3 ＝C 1 When the water pump is in a water-deficient running state, the controller judges that the space formed by the first pump shell 2 and the second pump shell 3 is full of water flow, namely the water pump is not in the water-deficient running state; said C is 3 ＝C 2 When the water pump is in the water shortage running state, the controller triggers and enters the water shortage protection detection state to start to operate the running frequency S 2 Comparing with the trigger frequency A;
during operation, the actual capacitance value of the capacitor formed by the first pole plate 7 and the second pole plate 8 is compared with the capacitance values of the first pole plate 7 and the second pole plate 8 in two different states of water and no water, the water shortage state in the pump cavity of the water pump is determined before the controller executes water shortage protection detection, and the situation that the controller makes erroneous judgment or missing judgment to influence water supply stability is avoided.
As an embodiment of the present invention, the second pump shell 3 is provided with a movable groove 31; a guide groove is formed in the side wall of the movable groove 31; the movable plate 9 is arranged in the movable groove 31 in a sliding way; a guide projection 91 is arranged on the side surface of the movable plate 9; the guide projection 91 is inserted into the guide groove and slides in the guide groove; the second pump shell 3 is provided with an installation groove; the second polar plate 8 is fixedly arranged in the mounting groove; the movable plate 9 extends out of the movable groove 31 and then enters the mounting groove; the surface of the movable plate 9 is flush with the surface of the second pump shell 3; the distance between the polar plate I7 and the pump shell I2 is greater than the distance between the movable plate 9 and the pump shell I2; the first polar plate 7 is positioned below the second movable plate 9; a gap is formed between the lower surface of the movable plate 9 and the bottom surface of the movable groove 31; an air bag 93 is fixedly arranged in the movable groove 31; a pushing plate 92 is fixedly arranged at one end of the movable plate 9 far away from the mounting groove; the pushing plate 92 is contacted with the bottom surface of the movable groove 31, and the two are vertical to each other; an elastic column 921 is fixedly arranged on the side surface of the pushing plate 92; the other end of the elastic column 921 is fixedly connected to the side wall of the movable slot 31 far away from the mounting slot; the elastic column 921 has a thrust force pointing to the mounting groove direction on the push plate 92; the air bag 93 is filled with air, and the distance between the air bag 93 and the mounting groove is smaller than the distance between the pushing plate 92 and the mounting groove; the air bag 93 has thrust towards the direction far away from the mounting groove on the push plate 92; the movable plate 9 is only positioned in the movable groove 31 in a normal state, does not enter the mounting groove and reaches the upper part of the first polar plate 7; the movable plate 9 is made of plastic materials, and a proper amount of ceramic micro powder is packaged in the movable plate; the dielectric constant of the ceramic micro powder is obviously larger than that of the water flow and the impeller 6; a polytetrafluoroethylene waterproof layer is sprayed on the surface of the movable plate 9, the surface of the pushing plate 92, the surface of the movable groove 31 and the surface of the air bag 93;
when the water pump works, when positive pressure exists in a pump cavity formed by the pump shell I2 and the pump shell II 3, when the water pump keeps supplying water, the air bag 93 in the movable groove 31 is under the action of pressure and is extruded to shrink, meanwhile, because the air bag 93 has pushing action force on the push plate 92, after the air bag 93 shrinks, the action force of the air bag 93 on the push plate 92 is reduced, the push plate 92 moves towards the direction of the mounting groove under the action of the elastic column 921, so as to drive the movable plate 9 to enter the mounting groove, meanwhile, because ceramic micro powder with large dielectric constant is packaged in the movable plate 9, after the movable plate 9 enters the mounting groove, namely, the movable plate 9 is positioned in an area right opposite to the polar plate I7 and the polar plate II 8, the capacitance value of a capacitor formed by the polar plate I7 and the polar plate II 8 is changed, under different pressures obtained through measurement in advance, the capacitance value of the capacitor formed by the polar plate I7 and the polar plate II 8 is changed, after the movable plate 9 enters the mounting groove to cause the capacitance value of the capacitor formed by the first polar plate 7 and the second polar plate 8 to change, the controller obtains a pressure value through the corresponding relation between the capacitance value and the pressure, the accuracy of water shortage protection of the water pump controlled by the controller is improved, meanwhile, the degree of change of the capacitance value of the capacitor formed by the first polar plate 7 and the second polar plate 8 can be increased by packaging ceramic micro powder with a large dielectric constant in the movable plate 9, the error is reduced, the measurement accuracy of the pressure of the water pump is improved, and the control accuracy of the controller is improved.
The specific working process is as follows:
when the water pump works, when the water pump runs, the impeller 6 in a space formed by the pump shell I2 and the pump shell II 3 continuously rotates to convey water flow, meanwhile, as the stirring plate 61 is arranged on the impeller 6, and the thicknesses of all parts of the impeller 6 are the same, the stirring plate 61 on the impeller 6 exists, the relative volume of the impeller 6 is larger, more materials are used, when the impeller 6 rotates between the polar plate I7 and the polar plate II 8, the stirring plate 61 on the impeller 6 enters the area, right opposite to the polar plate I7 and the polar plate II 8, of the polar plate I7 and the polar plate II 8, substances entering the space between the polar plate I7 and the polar plate II 8 are increased, the materials are obtained through the determining formula of the capacitor, the increased volume is equivalent to the increase of dielectric medium between the two polar plates of the capacitor, the capacitance value is increased, and the control is caused to increaseThe capacitance value formed by the first polar plate 7 and the second polar plate 8 detected by the system periodically changes in a certain range, so that the frequency of the change of the capacitance value is obtained, meanwhile, the impeller 6 is connected with the output shaft of the motor 1, the impeller 6 and the motor 1 synchronously rotate, and the obtained frequency of the change of the capacitance value is the operating frequency S 2 (ii) a Comparing the actual capacitance value of the capacitor formed by the first pole plate 7 and the second pole plate 8 with the capacitance values of the first pole plate 7 and the second pole plate 8 in two different states of water and no water, and determining the water shortage state in the pump cavity of the water pump before the controller executes water shortage protection detection; when positive pressure exists in a pump cavity formed by the pump shell I2 and the pump shell II 3, and the water pump keeps supplying water, the air bag 93 in the movable groove 31 is under the action of pressure and is extruded to shrink, meanwhile, because the air bag 93 has pushing acting force on the push plate 92, after the air bag 93 shrinks, the acting force of the air bag 93 on the push plate 92 is reduced, the push plate 92 moves towards the direction of the mounting groove under the action of the elastic column 921, so that the movable plate 9 is driven to enter the mounting groove, the capacitance value of the capacitor formed by the polar plate I7 and the polar plate II 8 is changed, the capacitance value of the capacitor formed by the polar plate I7 and the polar plate II 8 is obtained through measurement in advance under different pressures, and the controller obtains a pressure value through the corresponding relation between the capacitance value and the pressure.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A detection method for water shortage protection of a constant-pressure variable-frequency water pump is characterized by comprising the following steps: the controller of the constant-pressure variable-frequency water pump is internally provided with a maximum operation frequency S1 of the water pump; a trigger frequency A for triggering water shortage protection is set in a controller of the constant-pressure variable-frequency water pump; the trigger frequency A is the maximum operation frequency S1-2Hz, namely A is S1-2; the current running frequency of the controller for controlling the running of the water pump driving motor is set to be S2; the maximum operation frequency S1 is the frequency when the water pump is in the constant pressure mode and the pump cavity of the water pump is in the water shortage state, and the controller controls the full-speed operation of the water pump driving motor before the pressure set by the controller is not reached; when the pump cavity of the water pump is in a water shortage state and the controller operation frequency S2 is greater than or equal to the trigger frequency A, namely S2 is greater than or equal to A, triggering a controller detection mechanism to enter a water shortage protection detection state; when the operating frequency S2 of the controller is less than the trigger frequency A, namely S2 is less than A, the controller does not act, and the water pump keeps the operating state unchanged;
after the controller enters water shortage protection detection, the controller detects the pressure of a water outlet (5) of the water pump through a pressure sensor; the pressure sensor is arranged on a pipeline close to the water outlet of the water pump in the pipe network, and a pressure tank for maintaining stable pressure of the pipe network is arranged on the pipeline; the controller completes the pressure detection of the water outlet (5) of the water pump at intervals of 2 ms; a judgment condition B is set in the controller; the judgment condition B is an absolute value of a difference between the secondary pressure detection value P1 and the last pressure detection value P2, that is, B ═ P1-P2 |; a counting condition T is set in the controller, and the initial value of the counting condition T is equal to 0; when the value of the judgment condition B is equal to 0, the value of the counting condition is added with 1, namely when B is equal to 0, T is equal to T + 1; when the value of the counting condition T is equal to 10, the controller judges that the pressure of a water outlet (5) of the water pump is unchanged; when the value of the judgment condition B is larger than 0, resetting the value of the counting condition T, namely B > 0, and T is 0; after the value of the counting condition T is cleared, the controller continues to circularly generate and judge the value of the judging condition B;
comprises a detection device; the detection device is fixedly arranged on the water pump; the water pump comprises a motor (1), a first pump shell (2), a second pump shell (3) and an impeller (6); the pump shell I (2) is fixedly arranged on the motor (1); the second pump shell (3) is fixedly arranged on the first pump shell (2) through bolts; an output shaft of the motor (1) extends into a space formed by the first pump shell (2) and the second pump shell (3); an impeller (6) is fixedly arranged on an output shaft of the motor (1); a water inlet (4) is formed in the side surface of the outer side of the pump shell II (3) and the output shaft of the motor (1); the central line of the water inlet (4) is superposed with the central line of the impeller (6); a water outlet (5) is fixedly arranged on the circumferential surface of the outer side of the pump shell II (3) along the tangential direction; the detection device comprises a first polar plate (7) and a second polar plate (8); the second polar plate (8) is fixedly arranged on the first pump shell (2); the first polar plate (7) is fixedly arranged on the second pump shell (3); the first polar plate (7) is opposite to the second polar plate (8), and the first polar plate and the second polar plate are respectively positioned on the side faces, opposite to each other, of the first pump shell (2) and the second pump shell (3); the impeller (6) is positioned between the first polar plate (7) and the second polar plate (8); a poking plate (61) is arranged in the impeller (6); the poking plates (61) are uniformly distributed in the impeller (6); the area of the positive electrode plate I (7) opposite to the area of the positive electrode plate II (8) is equal; when the impeller (6) rotates, only one shifting plate (61) exists in the area opposite to the first polar plate (7) and the second polar plate (8) at the same time; a first electrode plate (7) and a second electrode plate (8) in the detection device form a capacitor and are electrically connected with a controller for controlling the operation of the water pump;
a space formed by the pump shell I (2) and the pump shell II (3) is filled with water flow, namely, when the water pump operates normally, water flow exists between the polar plate I (7) and the polar plate II (8); the capacitance value when water flow exists between the first polar plate (7) and the second polar plate (8) is set to be C1, and the capacitance value when water flow does not exist between the first polar plate (7) and the second polar plate (8) is set to be C2; the controller compares the actual capacitance value C3 of a capacitor consisting of a first plate (7) and a second plate (8) with C1 and C2 in the operation process of the water pump; when the C3 is equal to C1, the controller judges that a space formed by the pump shell I (2) and the pump shell II (3) is full of water flow, namely the water pump is not in a water shortage running state; when the C3 is equal to C2, the controller judges that no water flow exists in a space formed by the first pump shell (2) and the second pump shell (3), namely the water pump is in a water shortage running state, the controller triggers and enters a water shortage protection detection state, and the running frequency S2 and the triggering frequency A are compared;
a movable groove (31) is formed in the second pump shell (3); a guide groove is formed in the side wall of the movable groove (31); a movable plate (9) is arranged in the movable groove (31) in a sliding way; a guide bulge (91) is arranged on the side surface of the movable plate (9); the guide projection (91) is inserted into the guide groove and slides in the guide groove; the second pump shell (3) is provided with an installation groove; the second polar plate (8) is fixedly arranged in the mounting groove; the movable plate (9) extends out of the movable groove (31) and then enters the mounting groove; the surface of the movable plate (9) is flush with the surface of the second pump shell (3); the distance between the first polar plate (7) and the first pump shell (2) is greater than the distance between the movable plate (9) and the first pump shell (2); the first polar plate (7) is positioned below the second movable plate (9); a gap is formed between the lower surface of the movable plate (9) and the bottom surface of the movable groove (31); an air bag (93) is fixedly arranged in the movable groove (31); a pushing plate (92) is fixedly arranged at one end of the movable plate (9) far away from the mounting groove; the pushing plate (92) is contacted with the bottom surface of the movable groove (31), and the pushing plate and the movable groove are vertical to each other; an elastic column (921) is fixedly arranged on the side surface of the pushing plate (92); the other end of the elastic column (921) is fixedly connected to the side wall of the movable groove (31) far away from the mounting groove; the elastic column (921) has thrust to the push plate (92) in the direction pointing to the installation groove; the air bag (93) is filled with air, and the distance between the air bag (93) and the mounting groove is smaller than the distance between the pushing plate (92) and the mounting groove; the air bag (93) has thrust towards the direction far away from the mounting groove on the push plate (92); the movable plate (9) is only positioned in the movable groove (31) in a normal state, does not enter the mounting groove and reaches the upper part of the first polar plate (7); the movable plate (9) is made of plastic materials, and a proper amount of ceramic micro powder is packaged in the movable plate; the dielectric constant of the ceramic micro powder is obviously greater than that of the water flow and the impeller (6); a polytetrafluoroethylene waterproof layer is sprayed on the surface of the movable plate (9), the surface of the pushing plate (92), the surface of the movable groove (31) and the surface of the air bag (93);
when positive pressure exists in a pump cavity formed by the pump shell I (2) and the pump shell II (3), and the water pump keeps supplying water, the air bag (93) in the movable groove (31) is under the action of the pressure and is extruded to shrink, meanwhile, because the air bag (93) has pushing action on the push plate (92), after the air bag (93) shrinks, the action of the air bag (93) on the push plate (92) is reduced, the push plate (92) moves towards the direction of the mounting groove under the action of the elastic column (921), so that the movable plate (9) is driven to enter the mounting groove, the capacitance value of a capacitor formed by the polar plate I (7) and the polar plate II (8) is changed, the capacitance value of the capacitor formed by the polar plate I (7) and the polar plate II (8) under different pressures is obtained through measurement in advance, and the controller obtains a pressure value through the corresponding relation between the capacitance value and the pressure.
2. The method for detecting the water shortage protection of the constant-pressure variable-frequency water pump as claimed in claim 1, wherein the method comprises the following steps: the controller is internally provided with a current running current I1 of a water pump driving motor; a water shortage protection current I2 of a water pump driving motor is set in the controller; the controller is internally provided with a water pump driving motor with the running current of I3 when the water pump is at the maximum flow; the water shortage protection current I2 is smaller than the running current I3 of the water pump driving motor when the water pump is at the maximum flow point, namely I2 is smaller than I3; when the value of the counting condition T is equal to 10, the controller judges that the pressure of the water outlet of the water pump is unchanged and before the controller executes the action of water shortage protection, the controller compares the current operation current I1 with the current value of the water shortage protection current I2; when the running current I1 is less than the water shortage protection current I2, namely I1 is less than I2, the controller judges that the water pump is in a serious water shortage state, the controller executes a water shortage protection action, and the power supply of the water pump driving motor is disconnected; the operation current I1 is more than the water shortage protection current I2, namely I1 is more than I2, the controller judges that the water pump is in a high-flow water using state, the controller does not act, and the water pump keeps the operation state unchanged.
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| CN114738294B (en) * | 2022-04-13 | 2023-05-30 | 珠海格力电器股份有限公司 | Water pump water shortage detection method and device, computer equipment and medium |
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| CA2309523A1 (en) * | 1999-06-28 | 2000-12-28 | Diagnostic Engineering Inc. | Wireless pump jack dynamometer |
| CN1699950A (en) * | 2004-05-21 | 2005-11-23 | 株式会社小松制作所 | Hydraulic machine, system for monitoring health of hydraulic machine, and method thereof |
| CN106351820A (en) * | 2016-10-13 | 2017-01-25 | 台州浦力得电子科技有限公司 | Water supply control method for water pump |
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| CN103089659B (en) * | 2011-10-31 | 2015-12-16 | 朱小雄 | A kind of water pump with water-shortage protection device |
| CN107687418B (en) * | 2017-08-28 | 2019-03-01 | 宁波德业变频技术股份有限公司 | A kind of novel water shortage determination method for no flow sensor constant pressure water supply system |
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| CA2309523A1 (en) * | 1999-06-28 | 2000-12-28 | Diagnostic Engineering Inc. | Wireless pump jack dynamometer |
| CN1699950A (en) * | 2004-05-21 | 2005-11-23 | 株式会社小松制作所 | Hydraulic machine, system for monitoring health of hydraulic machine, and method thereof |
| CN106351820A (en) * | 2016-10-13 | 2017-01-25 | 台州浦力得电子科技有限公司 | Water supply control method for water pump |
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