Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of electric water pump intelligent monitoring protective device to the high band liquid level control of the motor intelligent degree of protection of electric water pump is provided.
The object of the invention is achieved through following technical proposals: said protective device comprises mains switch, control switch and performance element, between the motor that said performance element is serially connected in electric water pump and the mains switch that is connected electrical network; Said performance element is the electromagnetic control apparatus of single-phase or three-phase, and like A.C. contactor, its electric control system is electrically connected with CPU; Said CPU configuration install software and the memory cell of preserving data, each unit of giving protective device or the power subsystem that module provides working power; Said protective device configuration current sensor, voltage sensor and liquid level sensor; Current sensor and voltage sensor are installed in the electrical network; Liquid level sensor is installed in the place, water source, and the liquid level signal output of the current signal output end of current sensor, the voltage signal output end of voltage sensor and liquid level sensor all is electrically connected with CPU; Said control switch is electrically connected with CPU, and running status and holding state are set; When said protective device is in running status; Protective device is in the intelligent protection state: when current signal that obtains when CPU or voltage signal or liquid level signal exceed a certain set point; CPU is sent instruction to performance element; Cut off the power supply of motor, protective device switches to holding state from running status; When said control switch is in holding state; When voltage signal that obtains when CPU and liquid level signal all satisfy safe operation and require; CPU is sent instruction to performance element, connects the power supply of motor, and control switch switches to running status from holding state.
Said protective device configuration temperature sensor, temperature sensor is installed on the motor of electric water pump, and the temperature signal output of temperature sensor is electrically connected with CPU; When said protective device is in running status; Protective device is in the intelligent protection state: when current signal that obtains when CPU or voltage signal or liquid level signal or temperature signal exceed a certain set point; CPU is sent instruction to performance element; Cut off the power supply of motor, control switch switches to holding state from running status; When said control switch is in holding state; When voltage signal that obtains when CPU and liquid level signal and temperature signal all satisfy safe operation and require; CPU is sent instruction to performance element; Connect the power supply of motor, protective device switches to running status from holding state.
Said CPU configuration is provided with unit, display unit and external interface, unit and display unit is set constitutes the human-computer dialogue device jointly; Said display unit constitutes the monitoring arrangement that shows the electric water pump operating state or shut down reason; Said external interface can connect remote computer.
The key that the configuration of said CPU can be automatically detects and set the safeguard protection parameter to electric water pump motor running parameter is automatically adjusted; When said protective device is in running status; Protective device is in intelligent protection and the ready state of adjusting: if there is not the parameter tuning record of electric water pump in the memory cell; And electric water pump is when first operation accumulated running time reaches set point, perhaps last time parameter tuning time surpass when being worth sometime the button of perhaps adjusting by next key as the operator; The modular circuit that one key is adjusted is triggered; After one key was adjusted and is triggered, CPU analyzing and processing electric water pump was in the historical record of run duration and the parameter of current detection, and the safeguard protection parameter of electric water pump is optimized combination and preserves.
Between said CPU and the liquid level sensor, the square wave power supply is set, the square wave of the output AC low frequency of square wave power supply, frequency is not higher than 4 hertz.
Compared with prior art, the present invention has the following advantages: simple and reasonable, intelligent degree is high, a key is adjusted and can be obtained the best protection effect to electric water pump, the idle running that the liquid level signal that liquid level sensor detects can be stopped electric water pump effectively.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
Referring to accompanying drawing, said protective device comprises mains switch, control switch and performance element, between the motor that said performance element is serially connected in electric water pump and the mains switch that is connected electrical network; Said performance element is the electromagnetic control apparatus of single-phase or three-phase, and its electric control system is electrically connected with CPU; Said CPU configuration install software and the memory cell of preserving data, each unit of giving protective device or the power subsystem that module provides working power; Said protective device configuration current sensor, voltage sensor and liquid level sensor; Current sensor and voltage sensor are installed in the electrical network; Liquid level sensor is installed in the place, water source, and the liquid level signal output of the current signal output end of current sensor, the voltage signal output end of voltage sensor and liquid level sensor all is electrically connected with CPU; Said protective device is electrically connected with CPU, and running status and holding state are set; When said protective device is in running status; Protective device is in the intelligent protection state: when current signal that obtains when CPU or voltage signal or liquid level signal exceed a certain set point; CPU is sent instruction to performance element; Cut off the power supply of motor, control switch switches to holding state from running status; When said control switch is in holding state; When voltage signal that obtains when CPU and liquid level signal all satisfy safe operation and require; CPU is sent instruction to performance element, connects the power supply of motor, and protective device switches to running status from holding state.
Said protective device configuration temperature sensor, temperature sensor is installed on the motor of electric water pump, and the temperature signal output of temperature sensor is electrically connected with CPU; When said control switch is in running status; Protective device is in the intelligent protection state: when current signal that obtains when CPU or voltage signal or liquid level signal or temperature signal exceed a certain set point; CPU is sent instruction to performance element; Cut off the power supply of motor, control switch switches to holding state from running status; When said control switch is in holding state; When voltage signal that obtains when CPU and liquid level signal and temperature signal all satisfy safe operation and require; CPU is sent instruction to performance element; Connect the power supply of motor, control switch switches to running status from holding state.
Said CPU configuration is provided with unit, display unit and external interface, unit and display unit is set constitutes the human-computer dialogue device jointly; Said display unit constitutes the monitoring arrangement that shows the electric water pump operating state or shut down reason; Said external interface can connect remote computer.
The key that the configuration of said CPU can be automatically detects and set the safeguard protection parameter to electric water pump motor running parameter is automatically adjusted; When said protective device is in running status; Protective device is in intelligent protection and the ready state of adjusting: if there is not the parameter tuning record of electric water pump in the memory cell; And electric water pump is when first operation accumulated running time reaches set point, perhaps last time parameter tuning time surpass when being worth sometime the button of perhaps adjusting by next key as the operator; The modular circuit that one key is adjusted is triggered; After one key was adjusted and is triggered, CPU analyzing and processing electric water pump was in the historical record of run duration and the parameter of current detection, and the safeguard protection parameter of electric water pump is optimized combination and preserves.
Between said CPU and the liquid level sensor, the square wave power supply is set, the square wave of the output AC low frequency of square wave power supply, frequency is not higher than 4 hertz.
CPU: the product or the module that adopt prior art.
One key is adjusted: be a trigger module, cooperate with special-purpose software with button and trigger.The module that one key is adjusted adopts the prior art design and makes.The button that one key is adjusted adopts the product of prior art.
Control switch: be a trigger switch, the signal of trigger switch is given CPU, and CPU is given performance element again.Control switch adopts the product of prior art.
Performance element: be a switch that receives central processing unit controls, performance element adopts the product of prior art.
Voltage sensor: the under-voltage or overvoltage of detection of grid, voltage signal feeds back to CPU.Voltage sensor adopts the product of prior art.
Current sensor: the detection of grid phase shortage, the overcurrent or the no-load current of detection motor, current signal feeds back to CPU.Current sensor adopts the product of prior art.
Temperature sensor: the real time temperature when detecting the machine operation of electric water pump motor, temperature signal feeds back to CPU.Temperature sensor adopts the product of prior art.
Memory cell: the parameter of storing software, setting and preservation real time data.Memory cell adopts the product of prior art.
Display unit: display working condition.Display unit adopts the product of prior art.
The unit is set: manual work is provided with the protection parameter.The product that the unit adopts prior art is set.
Power subsystem: power supply receives central processing unit controls from electrical network, each modular unit supply power.Power subsystem adopts the product of prior art.
External interface: with extraneous communication or networking.External interface adopts the product of prior art.
Liquid level sensor: the product that adopts prior art;
Square wave power supply: the circuit or the product that adopt prior art.Frequency is not less than 4 hertz ac square wave, can prolong the distance of liquid level sensor to CPU effectively.
Embodiment 1: the single-phase electric water pump intelligent monitoring protective device of band liquid level control.
The electric water pump intelligent monitoring protective device of single-phase zone liquid level of the present invention control is connected between the motor of the mains switch that connects electrical network and electric water pump.CPU is the core, connects voltage sensor, current sensor, temperature sensor, liquid level sensor, power subsystem, display unit, external interface, the unit is set, control switch, a key are adjusted, memory cell and performance element.In the present embodiment: each one of the liquid level sensor of voltage sensor, current sensor, temperature sensor, lowest water level; Voltage sensor, current sensor are connected in the electrical network; Temperature sensor is installed on the motor of electric water pump, and liquid level sensor is installed in the extreme lower position of the setting at water source.When protective device is in the " RUN " state; Assembled protector is in intelligent protection and the ready state of adjusting: if there is not the parameter tuning record of electric water pump in the memory cell; Electric water pump after first operation accumulative total is moved a period of time, perhaps last time parameter tuning time surpass when being worth sometime the button of perhaps adjusting by next key as the operator; The modular circuit that one key is adjusted is triggered; After one key was adjusted and is triggered, CPU analyzing and processing electric water pump was in the historical record of run duration and the parameter of current detection, and the safeguard protection parameter of electric water pump is optimized combination and preserves.When current signal that obtains when CPU or voltage signal or temperature signal or water level signal exceeded a certain set point, CPU was sent instruction to performance element, cuts off electric network source; When current signal, voltage signal, temperature signal and the water level that obtains when CPU all satisfied safe operation and require, CPU was sent instruction to performance element, connects electric network source; When said control switch was in halted state, protective device was in holding state.Protective device of the present invention can be realized unattended operation, and automated intelligent is kept watch on and protection.
Embodiment 2: the three-phase electric water pump intelligent monitoring protective device of band liquid level control.
Basic identical with embodiment 1, different is to use on the three-phase electric water pump.Each three of voltage sensor and current sensors.One key is adjusted identical with embodiment 1 with intelligent protection.Protective device of the present invention can be realized unattended operation, and automated intelligent is kept watch on and protection.
The protector of the foregoing description 1-2, can realize following protection:
(1), overcurrent protection.Through the human-computer dialogue device threshold value of overcurrent is set, when detect electric current exceed the threshold value certain hour as 5 seconds after, CPU is sent instruction and is cut off the electricity supply to performance element, and show state and reason.
(2), no-load protection.Through the human-computer dialogue device threshold value of no-load current is set, when detect electric current be lower than the threshold value certain hour as 20 seconds after, CPU is sent instruction and is cut off the electricity supply to performance element, and show state and reason.To be that electric water pump is anhydrous take out in zero load, the motor idle running of electric water pump.
(3), overvoltage protection.Through the human-computer dialogue device threshold value of overvoltage is set, when detect voltage exceed the threshold value certain hour as 5 seconds after, CPU is sent instruction and is cut off the electricity supply to performance element, and show state and reason.
(4), under-voltage protection.Through the human-computer dialogue device under-voltage threshold value is set, when detect voltage be lower than the threshold value certain hour as 5 seconds after, CPU is sent instruction and is cut off the electricity supply to performance element, and show state and reason.
(5), motor temperature protection.Through the human-computer dialogue device threshold value of electric water pump motor temperature is set, is higher than after the threshold value certain hour was as 5 seconds when detecting the electric water pump motor temperature, CPU is sent instruction and is cut off the electricity supply to performance element, and show state and reason.
(6), the automated intelligent protection parameter of adjusting.When said control switch is in running status; Protective device is in intelligent protection and the ready state of adjusting: if there is not the parameter tuning record of electric water pump in the memory cell; Electric water pump after first operation accumulative total is moved a period of time, perhaps last time parameter tuning time surpass when being worth sometime the button of perhaps adjusting by next key as the operator; The modular circuit that one key is adjusted is triggered; After one key was adjusted and is triggered, CPU analyzing and processing electric water pump was in the historical record of run duration and the parameter of current detection, and the safeguard protection parameter of electric water pump is optimized combination and preserves.When current signal that obtains when CPU or voltage signal or temperature signal exceeded a certain set point, CPU was sent instruction to performance element, cuts off electric network source; When current signal, voltage signal and the temperature signal that obtains when CPU all satisfied safe operation and require, CPU was sent instruction to performance element, connects electric network source; When said control switch was in halted state, protective device was in holding state.
(7), intelligent surveillance.Display unit is the real-time display working condition of ability just, particularly can show the reason of electric water pump when intelligent power-off protection, is convenient to quick maintenance platoon and is out of order.
(8), open-phase protection.This is the intelligent protection to the three-phase electric water pump.When the numerical value of the current sensor of a certain phase is 0, just can conclude that this does not have electricity mutually, is phase shortage.CPU is sent instruction and is cut off the electricity supply to performance element, and show state and reason.
(9), liquid level protection: when liquid level signal shows that when reaching set point, CPU is judged to be dried-up water level, send instruction and cut off the electricity supply, and show state and reason to performance element.The idle running that the liquid level signal that liquid level sensor detects can be stopped electric water pump effectively.
(10), unattended operation, operation automatically.That is: in electric water pump when operation,, when detected electric current or voltage or temperature or liquid level exceeded the threshold value of setting, CPU was sent instruction and is cut off the electricity supply to performance element; Electric water pump is after automatic a period of time out of service, and when detected voltage or temperature and liquid level all satisfied the safe operation index, CPU was sent instruction and given the performance element energized.Can realize unattended operation, the motor of electric water pump is carried out intelligent automatic protection.