JPH06241191A - Automatic operation control system for motor-driven pump - Google Patents

Abstract

PURPOSE:To provide a control system in which a first pump stopping lower limit water level sensor and a second pump stopping lower limit water level sensor can be arranged at a position as low as possible, fine adjustment is not required for setting the water level, and operations of pumps are alternately changed over with certainty even when both sensors are arranged at the same water level, or they are arranged at different water levels. CONSTITUTION:Motor-driven first and second pumps P1, P2 are utilized. The system further comprises a first pump stopping lower limit water level sensor SL1, a second pump stopping lower limit water level sensor SL2, a first pump starting upper limit water level sensor SH1, a second pump starting upper limit water level sensor SH2, and an automatic alternate operation circuit. The operation mode and the operation stopping mode of the second pump P2 are changed over for controlling alternate operation based on a water level sensing signal of the second pump starting upper limit water level sensor SH2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternating automatic operation control system for electric pumps for draining water in a water tank with two pumps.

[0002]

2. Description of the Related Art For draining work with an electric pump, a system in which two pumps are alternately switched and intermittently operated in order to prolong the service life of the pumps used, has been widely used.

However, since the switching between the alternating operation mode and the operation stop mode is conventionally performed by the lower limit water level detector for stopping the No. 2 pump, the lower limit water level detector for stopping the No. 2 pump is for stopping the first pump. When it is installed lower than the lower limit water level detector, the second pump is stopped even after the first pump is stopped due to the lowering of the first pump by operating the first lower pump The lower limit water level detector cannot be operated, the No. 2 pump does not switch from the operation stop mode to the operation mode, and remains in the operation stop mode, and then the No. 2 pump remains It cannot be started, and the No. 1 pump restarts, and switching between alternate operations does not work.

Therefore, the lower limit water level detector for stopping the No. 2 pump is arranged at a higher water level than the lower limit water level detector for stopping the No. 1 pump, and the lower limit of the No. 2 pump is stopped due to the decrease in the water level accompanying the operation of the No. 1 pump. After the water level detector is activated and the No. 2 pump is switched from the operation stop mode to the operation mode, the lower limit water level detector for stopping the No. 1 pump is activated. However, in this configuration mode,
Since the mounting position of the lower limit water level detector for stopping the No. 2 pump is high, even if a high-performance pump that can discharge to a low water level is used, its function cannot be fully exerted, It has the drawback of having to end the operation. Moreover, in the water level setting work of the lower limit water level detector for stopping the No. 1 pump and the lower limit water level detector for stopping the No. 2 pump, delicate adjustment is required, and a great deal of labor and time are spent.

[0005]

It is an object of the present invention that both the lower limit water level detector for stopping pump No. 1 and the lower limit water level detector for stopping pump No. 2 can be arranged at the lowest possible water level, and delicate adjustments can be made in setting the water level. To provide a control system that can reliably switch the alternate operation of both pumps even if both detectors are arranged at the same water level or with a height difference, without requiring is there.

[0006]

In the alternating automatic operation control system for an electric pump according to the present invention, an electrically driven No. 1 pump and No. 2 pump are used, and a No. 1 pump lower limit water level detector for controlling the minimum water level and 2 No. pump stop lower limit water level detector, No. 2 pump start upper limit water level detector that detects a higher water level than these detectors, No. 1 pump start upper limit water level detector that detects a higher water level than the detector, An abnormal rising water level detector for detecting a higher water level than the detector and an automatic alternating operation circuit are provided, and the operation mode and operation of the No. 2 pump are performed by the water level detection signal of the No. 2 pump starting upper limit water level detector. Alternate operation is controlled by switching the rest mode.

[0007]

Embodiments will be described below with reference to the drawings of the embodiments.

[0008] In FIG. 1, P ₁ is motorized No.1 pump, a No. 2 pump P ₂ is motorized, these both two pumps are installed in the water tank, the No.1 pump P ₁ Is equipped with a lower limit water level detector SL ₁ and an upper limit water level detector SH ₁ , and No. 2 pump P ₂ is equipped with a lower limit water level detector SL ₂ and an upper limit water level detector SH ₂ as well as an abnormally increased water level detector SHa. There is. In the drawings of the embodiments, the lower limit water level detector SL ₂ for stopping the No. ₂ pump is drawn at a position higher than the lower limit water level detector SL ₁ for stopping the No. 1 pump, but both are completely at the same height position. Alternatively, the first pump stop lower limit water level detector SL ₁ may be arranged at a higher position than the No. 2 pump stop lower limit water level detector SL ₂ . A No. 2 pump starting upper limit water level detector SH ₂ is arranged at a position higher than these two detectors SL ₁ and SL ₂ , and the operation mode and operation of the No. 2 pump P ₂ are determined by the detection signal of the detector SH _2. The pause mode is switched to control the alternating operation, and the abnormal water level detector SHa is arranged at a position higher than the detector SH ₂ .

Then, as shown in FIG. 2, an integrating circuit is constituted by a resistor R ₁ and a capacitor C at an input portion of an automatic operation control circuit for processing the water level detection signals from the respective detectors, and 2
The automatic operation circuit for processing the water level detection signal from the pump upper limit water level detector SH ₂ has a resistor R _{1 of the} input section.
A circuit in which a resistor R ₂ having a smaller resistance value and a die auto DI are connected in series is connected in parallel with the resistor R _{1 of the} input section.

The No. 1 pump P ₁ is an electric pump having a conventional well-known automatic control device, and when the pump ₁ alone is between the starting water level H ₁ and the stopping water level L ₁ , the water in the water tank increases to reach the starting water level H ₁ . The operation is repeated, that is, if the water tank is started, the water in the water tank is reduced and the water level is stopped to reach the stop water level L ₁ . Two
Circuit that No. pump P ₂ is performed the operation between the start level between H ₂ stops water level L _2, even then the water tank to the activation level H ₂ is performed once drainage is swollen to hold the stopped state It is composed.

The operation of the pump motor of the No. 2 pump P ₂ will be described in more detail. The lower limit water level detector SL ₂ for stopping the No. 2 pump and the upper limit water level detector SH ₂ for activating the No. 2 pump are constituted by b contacts, and an abnormality occurs. The rising water level detector SHa is composed of a-contacts, the water level in the water tank is lower than the stop water level L ₂ , and the lower limit water level detector SL ₂ , the upper limit water level detector SH ₂ and the abnormal rising water level detector SHa are all When the power is turned on by the breaker in the OFF state, the circuit b does not reach the state where the circuit control voltage can operate.
Electric power is supplied to the pump motor through the contacts, and the pump motor starts operating. However, when the control voltage rises, the H-level voltage is applied to the reset terminal R of the D-type flip-flop 2 and the L-level voltage is applied to the set input terminal S of the D-type flip-flop 2.
The output terminal Q of the D-type flip-flop 2 becomes H level and turns on the transistor Tr. At this point, the circuit control voltage has reached a voltage at which the circuit can operate, but has not reached a voltage at which the relay can operate. When the control voltage rises and reaches a voltage at which the relay can operate, the relay Tr is turned on because the transistor Tr is turned on. Therefore, the pump motor, which has been operating when the voltage is supplied through the b contact of the relay, stops.

The water level in the water tank is higher than the stop water level L ₂ and lower than the starting water level H ₂ , only the lower limit water level detector SL ₂ is ON and the upper limit water level detector SH ₂ and the abnormally increased water level detector SHa are in the OFF state. At this time, when the power is turned on by the breaker, the circuit control voltage has not reached the state where the circuit can operate, so that electric power is supplied to the pump motor through the contact b of the relay, and the pump motor starts operating. However, when the control voltage rises, the H-level voltage is applied to the reset input terminal R of the D-type flip-flop 2 and the L-level voltage is applied to the set input terminal S of the D-type flip-flop 2. The output terminal Q'of the type flip-flop 2 becomes H level and turns on the transistor Tr. At this point, the circuit control voltage has reached the voltage at which the circuit can operate, but has not reached the voltage at which the relay can operate. When the control voltage rises and the relay is ready to operate, the relay Tr is turned on because the transistor Tr is turned on. Therefore b of the relay
The pump motor, which was operating when the power was supplied via the contact, stops. After a further lapse of time, the voltage applied to the reset input terminal R of the D-type flip-flop 2 via the resistor RL ₂ is as follows because the charge of the capacitor CL has been discharged via the resistors RL and RL ₁ .
Transition from H level to L level.

When the water level in the water tank has reached the starting water level H ₂ , only the abnormally high water level detector SHa is OFF and the upper water level detector SH ₂ and the lower water level detector SL ₂ are in the ON state, the power is supplied by the breaker. When turned on, the circuit control voltage has not reached the state where the circuit can operate, so the relay b
Electric power is supplied to the pump motor through the contacts, and the pump motor starts operating. However, when the control voltage rises, the H level voltage is applied to the reset input terminal R of the D type flip-flop 2 and
Since the L-level voltage is applied to the set input terminal S of, the output terminal Q'of the D-type flip-flop 2 becomes H-level and the transistor Tr is turned on. At this point, the circuit control voltage has reached a state where the circuit can operate,
The voltage is not high enough for the relay to operate. Then, when the control voltage rises and the relay reaches a state in which the relay can operate, the relay Tr is turned on because the transistor Tr is turned on. Therefore, the pump motor, which has been operating when the electric power is supplied through the b contact of the relay, stops. After that, the electric charge of the capacitor CL is discharged through the resistors RL and RL ₁ even after a lapse of time,
When the voltage of the reset input terminal R of the D type flip-flop ₂ via the resistor RL ₂ shifts from the H level to the L level, the voltage of the H level is still applied to the reset input terminal R of the D type flip-flop 1. Up to D
Even if a clock signal is input to the clock input terminal CL of the type flip-flop 1, the D type flip-flop 1
No change occurs in the circuit state of. Therefore, the circuit state of the D-type flip-flop 2 does not change, and the relay keeps the ON state to keep the pump motor stopped. Then, when the time further passes, since the electric charge of the capacitor C ₁ is discharged through the resistor R ₄ , the voltage at the point I shifts from the H level to the L level through the resistor R ₅ , and the D type flip-flop 1 The circuit state of 2 becomes ready for operation whenever a clock input is input to the clock input terminal CL of the D-type flip-flop 1. When time further elapses, the capacitor C is charged through the resistor R ₀ , the resistor R ₂ , the diode DI and the resistor R ₁ , so that the clock input terminal C of the D type flip-flop 1 is connected.
The voltage applied to L is rising, and the voltage of the clock signal input terminal CL of the D-type flip-flop 1 is L.
When the clock signal is input to the D type flip-flop 1 after shifting from the level to the H level, the output terminal Q of the D type flip-flop 1 changes from the L level to the H level, and Q'changes from the H level to the L level. And changes. Then, the information that the output terminal Q of the D type flip-flop 1 has changed from the L level to the H level is applied to the clock input terminal CL of the D type flip flop 2, and the output terminal Q ′ of the D type flip flop 2 is changed from the H level to the L level. Since the transistor Tr becomes level and the transistor Tr is turned off, the relay is turned off. Therefore, the pump motor is supplied with electric power via the b contact of the relay to start the operation.

The inside of the water tank has reached the abnormally increased water level Ha,
When the power is turned on by the breaker when the abnormally high water level detector SHa is in the ON state together with the lower limit water level detector SL ₂ and the upper limit water level detector SH ₂ , the circuit control voltage has not reached the state where the circuit can operate, so the relay The electric power is supplied through the b contact of the pump motor to start the operation. However, when the control voltage rises, an H level voltage is applied to the reset input terminal R of the D type flip-flop 2,
The set input terminal S of the D type flip-flop 2 is L
Since the voltage of the level is applied, the output terminal Q ′ of the D type flip-flop 2 becomes the H level and turns on the transistor Tr. At this point, the circuit control voltage has reached the voltage at which the circuit can operate, but has not reached the voltage at which the relay can operate. When the control voltage rises to reach a voltage at which the relay can operate, the relay Tr is turned on because the transistor Tr is turned on. Therefore, the pump motor, which has been operating when the electric power is supplied through the b contact of the relay, stops. At this time, since the H level voltage is applied to the reset input terminal CL of the D type flip-flop 2,
Output terminal Q'of maintains the H level,
Also keeps ON and keeps the relay ON. Then, when time further elapses, the electric charge of the capacitor CL is discharged through the resistors RL and RL ₁ , so that D through the resistor RL ₂ is discharged.
The voltage applied to the reset terminal R of the type flip-flop 2 changes from H level to L level. When the time further passes, the circuit state of the D-type flip-flop 2 changes from the L level to the H level because the voltage applied to the set input terminal S of the D-type flip-flop 2 is charged in the capacitor Ca via the resistor Ra. Then, the output terminal Q'of the D type flip-flop 2 becomes L level and the transistor Tr is turned off. Therefore, the relay is off
However, the pump motor operates by being supplied with electric power through the b contact of the relay.

Next, the mode of alternate operation of the No. ₁ pump P ₁ and the No. 2 pump P ₂ will be described with reference to the embodiment shown in FIGS. 1 and 2.

After the power is turned on, each circuit is in a steady state, and when there is no water in the water tank and all the water level detectors are off, water flows into the water tank and the lower limit water level detector SL ₂ is turned on. At this time, the electric charge charged in the capacitor CL is discharged through the resistors RL and RL ₁ , so that the voltage applied to the reset input terminal R of the D type flip-flop 2 through the resistor RL ₂ is changed from H level to L level. Becomes At this time, since the L-level voltage is applied to the set terminal S of the D-type flip-flop 2, when the clock signal is input to the clock-signal input terminal CL, the D-type flip-flop 2 is ready to operate. Become. When water further flows in and the inside of the water tank rises to the water level of H ₂ , the upper limit water level detector SH ₂ is turned on, the electric charge is charged to the capacitor C via the resistance R ₀ and the resistance R _1, and the resistance R ₂
And the voltage charged through the diode DI and shifting from the L level to the H level via the resistor R ₃ is D
It is applied to the clock input terminal CL of the type flip-flop 1. When a pulse is applied to the clock input terminal CL of the D type flip-flop 1, the H level signal of the output terminal Q'of the D type flip flop 1 has already been applied to the data input terminal D of the D type flip flop 1. Therefore, the output terminal Q of the D type flip-flop 1 shifts from the L level to the H level and outputs it to the clock input terminal CL of the D type flip-flop 2. When one pulse of the clock signal is input to the clock input terminal of the D type flip-flop 1, the output terminal Q of the D type flip-flop 1 changes from the L level to the H level and the output terminal Q ′ of the D type flip-flop 1 changes to the H level. To L level. When the next clock signal is applied to the clock input terminal CL of the D-type flip-flop 1, the output terminal Q of the D-type flip-flop 1 changes from H level to L level, and the output terminal Q ′ of the D-type flip-flop 1 Shifts from L level to H level. That is, the output terminals Q and Q'of the D-type flip-flop 1 can be inverted and held for one rise of the water level. When a clock signal is input to the clock input terminal CL of the D type flip-flop 2 as the output terminal Q of the D type flip-flop 1 shifts from the L level to the H level, the output of the D type flip-flop 2 is output. The terminal Q'changes from H level to L level, the transistor Tr is turned off, and the relay is turned off. Therefore, the pump motor is supplied with electric power via point D of the relay and starts operating.

When the inside of the water tank rises to the water level of H ₂ in this way, drainage is performed by starting the No. 2 pump P ₂ , and when the water inside the water tank drops to the water level of L ₂ due to this drainage, the lower limit water level detector Since SL ₂ is turned off, the capacitor CL is charged with electric charge through the resistor RL, the voltage changes from the L level to the H level, and the H level is applied to the reset terminal R of the D-type flip-flop 2 through the resistor RL _2. The output terminal Q'of the D type flip-flop 2 is L
Since the level changes from the H level to the transistor Tr and the relay is turned on, the No. 2 pump P ₂ is stopped. At this time, the output terminal Q of the D type flip-flop 1 holds the H level and the output terminal Q'of the D type flip-flop 1 maintains the L level, so that the upper limit water level detector SH ₂ When the ON signal is further input, the output terminal Q of the D type flip-flop 1 shifts from the H level to the L level, and the output terminal Q'of the D type flip flop 1 shifts from the L level to the H level. Therefore,
A voltage shifting from H level to L level is applied to the clock input terminal CL of the D type flip-flop 2.
When the voltage shifts from the L level to the H level at the clock input terminal CL, the D type flip-flop 2 receives the D type flip block when both the set terminal S and the reset terminal R of the D type flip flop 2 are applied with the L level. H level information of the data input terminal D of the D type flip-flop 2 is outputted to the output terminal Q of the D type flip-flop 2 at the H level and L level is outputted to the output terminal Q'of the D type flip-flop 2.
The level is output. Even if the voltage for shifting the output terminal Q of the D type flip-flop 1 from the H level to the L level is applied to the clock input terminal CL of the D type flip flop 2,
Keeps holding data, and the D-type flip-flop 2
Since the output terminal Q'of H is maintained at H level, the transistor Tr remains ON and the relay remains ON.
Therefore, the pump motor is not supplied with electric power through the b contact of the relay, and the No. 2 pump P ₂ remains stopped.

When the water level in the water tank further rises and reaches the water level of H ₁ while the No. 2 pump P ₂ is maintained in the stopped state, the upper limit water level detector SH ₁ operates and the No. 1 pump P ₁ operates. to start. When the No. 1 pump P ₁ is operated to drain water and the inside of the water tank descends to the water level of L ₁ , the lower limit water level detector SL ₁ is turned off and the No. 1 pump P ₁ is stopped. At this time, since the lower limit water level detector SL ₂ does not cause a change in the output terminals Q and Q ′ of the D type flip-flop 1 regardless of whether it is ON or OFF, the circuit state of the D type flip-flop 2 is also changed. The transistor Tr is maintained in the ON state without being generated, the relay is also maintained in the ON state, and the pump motor is maintained in the stopped state.

As described above, the drainage in the water tank is performed by the alternating intermittent operation of the No. ₁ pump P ₁ and the No. 2 pump P _{2. As} described above, the upper limit water level detector for starting the No. 2 pump. In the automatic operation circuit that processes the water level detection signal from SH ₂ , a circuit in which a resistor R ₂ having a resistance value smaller than the resistance R _{1 of the} input part and a diode DI are connected in series is used. _Since it is connected in parallel with ₁ , when the upper limit water level detector SH ₂ is turned on, electric charge is charged to the capacitor C via the resistor RO via the resistor R ₁ and via the resistor R ₂ and the diode DI. As a result, the electric charges are rapidly charged from the two systems, and when the upper limit water level detector SH ₂ is turned off, the electric charges are discharged from the capacitor C in the one system path of only the resistor R ₁ . Therefore, as shown in FIG. 4, even if the upper limit water level detector SH ₂ is violently turned on and off, the waveform at the point F inside the IC of the D type flip-flop 1 produces only one pulse. In other words, the inside of the water tank is violently ruffled and the float type upper limit water level detector SH
_{Even if 2} moves up and down frequently, only 1 pulse is surely generated for one rise of the water level. Therefore, No. 1 pump P ₁ and No. 2 pump P can be detected by proper water level detection without malfunction. The operation switching of ₂ is surely performed.

Irrespective of how the No. ₁ pump P ₁ and the No. 2 pump P ₂ are operated, when the water in the water tank abnormally rises and rises to the water level of Ha, the abnormally increased water level detector SHa turns ON.
Then, the electric charge is charged in the capacitor Ca through the resistor Ra, the voltage rises, and the voltage changes from the L level to the H level, the level is applied to the set input terminal S of the D type flip-flop 2, and the output of the D type flip flop 2 The terminal Q'changes from the H level to the L level, the transistor Tr is turned off and the pump motor starts operating as described above. Therefore, for example, if the water in the water tank rises abnormally during the drainage by the No. 1 pump P ₁ and rises to the water level of Ha, the No. 2 pump P ₂
Also started and rapid drainage was performed by two pumps, and L ₂
No. 2 pump P ₂ stopped at the water level of 1 and then _{1 at} the water level of L 1.
The pump No. P _{1 is} also stopped. When the water in the water tank is abnormally increased and the water level rises to the water level of H _{1 when} the water is pumped by the No. 2 pump P ₂ , the No. 1 pump P ₁ is also started and rapid drainage is performed by the _two pumps. No. 2 pump P ₂ stopped at the water level,
Next, at the water level of L _1, the No. 1 pump P ₁ is also stopped. When one of the pumps fails, the other pump will perform intermittent operation independently within the range from the starting water level to the stopping water level.

When the power is turned on, the water level in the water tank is already abnormally high.
1 if the water level has reached a and rapid drainage is required.
Immediately after the automatic operation circuit operates normally when power is supplied to the pump motors of the No. ₁ pump P ₁ and No. 2 pump P ₂ , until the motor starting current of the No. 1 pump P ₁ stops flowing, 2
The operation of No. ₂ pump P ₂ is forcibly stopped, and the operation of No. 2 pump P ₂ is restarted when the motor starting current of No. 1 pump P ₁ stops flowing. As a result, the current value of the No. ₁ pump P _{1 and} the current value of the No. 2 pump P ₂ become the mode shown in FIG. 6, and the normal operation operation is performed without the breaker working.

[0022]

According to the system of the present invention, both the lower limit water level detector for stopping pump No. 1 and the lower limit water level detector for stopping pump No. 2 can be arranged at the lowest possible water level, and the water level setting is delicate. There is an advantage that the alternating operation of both pumps can be reliably switched even if both detectors are arranged at the same water level or provided with a height difference without requiring adjustment.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the relationship between pump operation switching and water level change in the system of the present invention.

FIG. 2 is an electric circuit diagram of a No. 2 pump used in the system of the present invention.

FIG. 3 is a circuit diagram of a No. 2 pump starting upper limit water level detector used in a conventional system.

FIG. 4 is a time chart showing the relationship between the detection signal from the No. 2 pump starting upper limit water level detector and the operation of the automatic alternating operation circuit according to the system of the present invention.

FIG. 5 is a time chart showing the relationship between the detection signal from the No. 2 pump starting upper limit water level detector and the operation of the automatic alternate operation circuit according to the conventional system.

FIG. 6 is a time chart showing changes in the current value of the No. 1 pump and the current value of the No. 2 pump when rapid drainage is performed by the system of the present invention.

FIG. 7 is a time chart showing changes in the current value of the No. 1 pump and the current value of the No. 2 pump when rapid drainage is performed by the conventional system.

[Explanation of symbols]

P ₁ 1 No. pump P ₂ 2 No. Pump SL ₁ 1 No. pump stop limit level detector SL ₂ 2 No. pump stops lower limit level detector SH ₁ 1 No. pump startup upper water level detector SH ₂ 2 No. pump start Upper water level detector SHa Abnormally rising water level detector

Claims (1)

[Claims] An electrically driven No. 1 pump (P ₁ ) and No. 2 pump (P ₂ ) are used to regulate the minimum water level. No. 1 pump stop lower limit water level detector (SL ₁ ) and No. 2 pump stop lower limit water level detection. Detector (SL ₂ ), which detects higher water levels than both detectors 2
No. pump starting upper limit water level detector (SH ₂ ), No. 1 pump starting upper limit water level detector (SH ₁ ) for detecting a higher water level than the detector, abnormal water increase detecting a higher water level than the detector A water level detector (SHa) and an automatic alternating operation circuit are provided, and the upper limit water level detector (SH for activating the No. 2 pump).
The water level detection signal _2), No. 2 pump (P ₂₎ alternately automatic operation control system for an electric pump, characterized in that switching the operation mode and shutdown mode of controlling the alternate operation.