JPH0633793B2 - Well pump controller - Google Patents

Description

TECHNICAL FIELD The present invention relates to a well pump control device, and more particularly to a well pump control device for ensuring the safety of a pump motor or the like when an abnormality occurs in the well pump.

(B) Conventional technology A well-known well-known pump control device is equipped with a pressure switch on the water outlet side of the pump to open the faucet and discharge water.
The pressure of the pressure switch decreases and the switch turns on, which causes the motor of the pump to move to pump water, and when the pressure increases, the motor stops. Further, when the faucet is closed while the motor is operating, the pressure of the pressure switch rises and the switch is turned off to stop the operation of the pump motor. Also, in this type of well pump control device,
In order to prevent freezing damage of the pump motor or the like during use in winter or in cold regions, there are some that are subjected to so-called antifreezing treatment by suppressing the temperature drop by lighting a light bulb or the like.

(C) Problems to be Solved by the Invention In the conventional well pump control device described above, the light bulb is turned on to prevent freezing. However, the person turns on and off the light bulb by judging the cold temperature. Since it was a thing, it was difficult to handle. It may be possible to turn on the light all day or winter to simplify handling, but in that case, it will be turned on even when the temperature is relatively high and lighting is not necessary, which is uneconomical. Is.

Further, the well pump control device may be idle-operated depending on the state, so that the pump motor may overheat and reach a dangerous state. In addition, sometimes an overcurrent flows through the pump motor, which is dangerous even if this state is left unattended.

However, the fact is that the conventional well pump control device does not take any special automatic safety measures against these overheating and overcurrent.

In view of the above, the present invention, even at low temperatures such as freezing,
On the contrary, it is an object of the present invention to provide a well pump control device capable of protecting the device on the safe side even when a high temperature or an overcurrent state is reached.

(D) Means and Actions for Solving the Problems In the well pump control device of the present invention, the first non-open leg is wound with the primary coil L ₁ connected to the AC power source (21), and the second Each of the non-open leg and the open leg of the secondary coil L
₂ and a leakage type tripod transformer wound with a tertiary coil L ₃ and a switching operation that receives a voltage across the tertiary coil to control the AC power source and the well pump motor (22) in a connected state. 1 switching circuit (24),
A second switching circuit (25) for controlling the connection between the heat generating circuit (23) which generates a heat when energized by receiving an ignition signal and the AC power supply, and a current flowing through the well pump motor. An overcurrent detection circuit that detects and outputs a first inhibit signal when the current is greater than or equal to a predetermined value
(51 to 53) and the ambient temperature of the well pump is measured, and if the temperature is higher than the high temperature set temperature, the second prohibition signal is output, and if it is lower than the low temperature set temperature, the ignition signal is output. A temperature control circuit (45 to 50) and a drive control circuit which outputs a drive signal on condition that the signal indicating the operating state of the well pump is not output and the first and second prohibition signals are not output. 38-44) and a short circuit (34-37) for short-circuiting the secondary coil in synchronization with the drive signal.

The first feature of this well pump control circuit is that it uses a leaky tripod transformer. Since the secondary coil and the tertiary coil are respectively wound around the non-open leg and the open leg, when the secondary coil is short-circuited, the first coil is synchronized with the first coil.
The switching circuit operates to operate the well pump motor. The secondary coil is short-circuited by a short circuit that operates according to the drive signal from the drive control circuit.

The second feature is that the temperature measuring circuit is provided, and when the ambient temperature of the well pump becomes lower than the low temperature setting temperature, an ignition signal is output to operate the second switching circuit and heat the heat generating circuit. . Therefore, freezing of the well pump motor and the like is prevented. When the ambient temperature is higher than the high temperature setting temperature, the output of the drive signal is prohibited by the second prohibition signal, so the operation of the well pump motor is stopped.

The third feature is that an overcurrent detection circuit is provided, and when an excessive current flows in the well pump motor, the operation of the well pump motor is stopped by the first prohibition signal.

In other words, in this well pump control circuit,
The well pump is equipped with automatic safety measures such as an overcurrent detection circuit.

(E) Examples Hereinafter, the present invention will be described in more detail with reference to Examples.

FIG. 1 is a circuit block diagram of a well pump control device showing an embodiment of the present invention.

The series circuit of the pump motor 22 and the first switching circuit 24 and the series circuit of the freeze prevention heater 23 and the second switching circuit 25 are both connected in parallel to the AC power supply 21.

The first switching circuit 24 includes a triac 26, reverse connection diodes 27 and 28, a tripod transformer 29, and the like. The tripod transformer 29 includes a primary coil L ₁ , a secondary coil L ₂ and a tertiary coil L ₃ .
In the tripod transformer 29, when the secondary coil L ₂ side is short-circuited, a low voltage is generated in the tertiary coil L ₃ , and the reverse connection diode 2
A voltage equal to or higher than the trigger gate voltage is applied between the terminal T _{1 of the} triac 26 and the gate G via 7.28, so that the triac 26 is fully ignited.

The second switching circuit 25 includes a triac 30 and
The triac 30 is composed of a firing circuit 31 for firing, and the firing circuit 31 includes a phototransistor 33 of a photocoupler 32.

The primary coil L ₁ of the tripod transformer 29 is connected to the AC power supply 21, and the AC voltage derived to the secondary coil L ₂ side is rectified by the rectifier circuit 34 and stabilized by the constant voltage circuit 35.
A power supply voltage is applied to each part of the electronic circuit. The secondary coil L ₂ of the tripod transformer 29 is connected to a light emitting diode 36 for operation display and a transistor 37 for shorting the secondary coil.

Signals from the well pump pressure switch 38, the flow switch 39, and the water cutoff relay 40 are input to the logic circuit 41. The logic circuit 41 outputs the signal a as “1” when the pressure switch 38 is turned on, for example, and then the flow switch 39.
Is turned off, the signal a is output as "0", and the output signal a of the logic circuit 41 is input to the output discrimination circuit 42.

Further, the logic circuit 41 receives the ON signal of the pressure switch 38, starts the timer circuit 43, and resets the timer circuit 43 when the flow switch 39 is subsequently turned ON.
When the timer circuit 43 is not reset and a predetermined time elapses, the time-up signal b is input to the output discrimination circuit 42.

The oscillating circuit 44 oscillates a signal of several KHz to several tens KHz (for example, 18 KHz) and applies the signal to the output signal discriminating circuit 42 and the gate circuit 48. The output signal discriminating circuit 42 outputs the signal from the oscillation circuit 44 to the transistor 3 when the signal for turning on the pump motor 22 is applied from the logic circuit 41.
In addition to 7, the secondary coil L of the tripod transformer 29 with this signal
Short and open ₂ . As a result, the secondary coil L ₂ is superimposed on the AC signal from the AC power supply 21 and the counter electromotive force of the signal is added, and as a result, a relatively large power supply voltage is obtained in the constant voltage circuit 35. .

Temperature sensor 45 provided near the pump motor 22
Inputs the detected temperature signal to the high temperature comparison circuit 46 and the low temperature comparison circuit 47. The high temperature comparison circuit 46 is adapted to input the signal c to the output signal discrimination circuit 42 when the detected temperature becomes higher than a predetermined value. Further, the low-temperature comparison circuit 47 applies a high signal to the gate circuit 48 when the detected temperature becomes lower than a predetermined value, and inputs a signal from the oscillation circuit 44 to the transistor 49. The light emitting diode 50 of the hono coupler 32 is connected to the transistor 49. When the transistor 49 is turned on / off, the light emitting diode 50 blinks and lights up, sends light to the phototransistor 33 of the ignition circuit 31, and turns on the triac 30. It is designed to arc.

Further, a current transformer 51 is coupled to the first switching circuit 24 to derive a current flowing in the pump motor 22, and an excessive value due to an inrush current is made inoperative in an inrush current inoperative circuit 52, and a current comparison circuit 53. Then, when the current is equal to or larger than the predetermined value, the inhibition signal d is input to the output signal discrimination circuit 42.

The tripod transformer used in the apparatus of this embodiment is a leaky tripod transformer, and the operation of the leaky tripod transformer will be described with reference to the operation principle diagram of FIG. However, this leaky tripod transformer itself is already known.

In FIG. 2, when the primary coil 11 is connected to the AC power source 14 and energized, the primary magnetic flux φ ₁ generated by the primary coil 11 is represented by a solid line when the switches SW at both ends of the secondary coil 12 are opened. Most of the magnetic flux is φ ₁ ′
Flows into the central leg 17 and interlinks with the secondary coil 12, and a voltage deviated from the phase of the AC power source 14 by about 180 ° is induced in the secondary coil 12. At this time, the opening leg 18 having the gap G has a high magnetic resistance and therefore can pass only a very small amount of leakage magnetic flux φ ₁ ″. Therefore, the magnetic flux interlinking with the tertiary coil 13 is also small, and the tertiary coil 13 has a very small amount. Only a small voltage is induced.

On the other hand, when the switches SW at both ends of the secondary coil 12 are closed, a short-circuit current flows in the secondary coil 12 and the secondary magnetic flux φ _{2 having a} phase almost opposite to that of the primary magnetic flux φ ₁ ′. There occurs in the center leg 17, as in the dotted line of FIG. 2, the magnetic flux phi _{2 'to} the first leg 16 which are wound a primary coil 11 shunts the flux phi _{2 "to} Kaikoashi 18.

When the short-circuit magnetic flux φ ₂ ′ of the secondary coil 12 flows through the first leg 16, the input to the primary coil 11 connected to the power supply 14 increases and the primary magnetic flux φ ₁ increases, and therefore flows into the open leg 18. The magnetic flux φ ₁ ″ also increases. In this way, the aperture leg 18
The short-circuit magnetic flux φ ₂ ″ and the primary magnetic flux φ ₁ ″ of the secondary coil 12.
Since a large amount of the combined magnetic flux of (3) flows and interlinks with the tertiary coil 13, the tertiary coil 13 has a waveform of 36 from the waveform of the AC power supply 14.
An output delayed by a little phase of 0 ° (in other words, slightly advanced in phase) is induced.

Since the leaky tripod transformer has the above characteristics, both ends of the secondary coil 12 are turned on / off by the switch SW.
If the OFF control is performed, an AC voltage having a phase slightly advanced from that of the AC power supply 14 is induced in the tertiary coil 13 in synchronization with this.

Next, the operation of the apparatus of this embodiment will be described.

When the temperature detected by the temperature sensor 45 is normal temperature, neither the high temperature comparison circuit 46 nor the low temperature comparison circuit 46 outputs an output signal, so that the triac 30 is not ignited and no current flows through the freeze prevention heater 23.

When the pressure switch 38 is turned on in this temperature state, the logic circuit 41 receives the signal, starts the timer circuit 43, and gives the signal a to the output signal discrimination circuit 42. The output signal discriminating circuit 42 gives the signal from the oscillation circuit 44 to the transistor 37 by this signal. The transistor 37 is turned on / off by this high frequency signal, and short-circuits / opens the secondary coil L ₂ of the tripod transformer 29. When the short circuit occurs, the tertiary coil L of the tripod transformer 29
₃ , a voltage is induced, the triac 26 is turned on, and the pump motor 22 starts operating.

While normal operation continues, the current obtained through the current transformer 51 to the current value comparison circuit 53 is very small, and the current value comparison circuit 5
3 does not output the prohibition signal d.

When the flow switch 39 is turned on after the pressure switch 38 is turned on, the timer circuit 43 is reset. However, the output signal discrimination circuit 42 receives the signal a from the logic circuit 41.
Is continuously added, the transistor 37 continues to be turned on / off, and the pump motor 22 continues to operate. Even if the pressure switch 38 is turned off, the output of the logic circuit 41 does not change.

When the flow switch 39 is turned off following the turning off of the pressure switch 38, the logic circuit 41 turns off the signal. As a result, the output signal discrimination circuit 42 inhibits the signal from the oscillation circuit 44 from being applied to the transistor 37. for that reason,
The transistor 37 is turned off, the secondary coil L ₂ of the tripod transformer 29 is opened, the voltage is not induced in the tertiary coil L ₃ , the triac 26 is turned off, and the operation of the pump motor 22 is stopped.

Next, when the flow switch 39 is not turned on after the pressure switch 38 is turned on, the timer circuit 43 times up and the inhibition signal b is input to the output signal discrimination circuit 42. In this case, the output signal discrimination circuit 42 is the oscillation circuit 44.
Since it is prohibited to apply the signal from the transistor 37 to the transistor 37, the operation of the pump motor 22 is stopped.

When the ambient temperature rises excessively, the prohibition signal c is output from the high temperature comparison circuit 46 and is input to the output signal discrimination circuit 42. When an excessive current flows through the pump motor 22, the current value comparison circuit 53 outputs a prohibition signal, which is input to the output signal discrimination circuit 42. In these cases as well,
The operation of the pump motor 22 is stopped.

The output signal discriminating circuit 42 has a function of holding an inhibition signal,
When any of the prohibition signals b, c, and d is input and the operation of the pump motor 22 is stopped, even if the prohibition is released, it is prohibited unless a manual reset (for example, power-off) is performed, that is, the operation stop state of the pump motor 22 remains unchanged. continue.

On the other hand, when the water cutoff switch 40 is turned off due to water cutoff, the logic circuit 41 turns off the signal a. In response to this, the output signal discrimination circuit 42 turns off the transistor 37 and stops the operation of the pump motor 22. When the water cutoff switch 40 is turned on, the logic circuit 41 signal a is turned on. In this case, the pump motor 22 is immediately restarted.

When the ambient temperature is low and the temperature detected by the temperature sensor 45 becomes a predetermined value or less when the season is winter, the low temperature comparison circuit 47 outputs a high signal, and the signal from the oscillation circuit 44 is passed through the gate circuit 48. Input to the transistor 49. This signal turns on / off the transistor 49, and accordingly the light emitting diode 50 of the photocoupler 32.
Flashes and lights. Then, the phototransistor 33 of the photocoupler 32 receives the blinking light, the ignition circuit 31 operates, the triac 30 is ignited, the power flows to the antifreezing heater 23, the antifreezing heater generates heat, and the ambient temperature is raised.

In the apparatus of this embodiment, as a normal operation, the pump motor 22 is turned on when the pressure switch 38 is turned on, and the pump motor 22 is turned off when the flow switch 39 is turned off after the pressure switch 38 is turned off. When either 38 or flow switch 39 is on, pump motor 2
2 may be turned on.

(F) Effect of the Invention According to the well pump control device of the present invention, the operation of the well pump motor is controlled depending on the state of the well pump, so that the operation of the well pump motor is automatically stopped at high temperature or overcurrent, for example. It is possible to secure the safety of the device. Further, when the temperature becomes low enough to freeze, the heat generating circuit is activated to raise the ambient temperature, so that the destruction of the device due to freezing can be avoided.

In addition, since the leakage of the pump motor current is performed by using a leaky tripod transformer to operate the low-voltage secondary side circuit that is insulated from the commercial power source, the control circuit section is used in high temperature and high humidity. It can be used safely even in the environment where the well pump is used, and of course there is no risk of electric shock in the operating part.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a well pump control device showing an embodiment of the present invention, and FIG. 2 is a drawing for explaining the operation principle of a leaky tripod transformer. 21: AC power supply, 22: Well pump motor, 23: Freezing prevention heater, 24: First switching circuit, 25: Second switching circuit, 34: Rectifier circuit, 35: Constant voltage circuit, 36: Diode, 37: Transistor, 38: Pressure switch, 39: Flow switch, 40: Water disconnection relay, 41: Logic circuit, 42: Output discrimination circuit, 43: Timer circuit, 44: Oscillation circuit, 45: Temperature sensor, 46: High temperature comparison circuit, 47 : Low temperature comparison circuit, 48: Gate circuit, 49: Transistor, 50: Light emitting diode, 51: Current transformer, 52: Inrush current non-operation circuit, 53: Current value comparison circuit.

Claims (1)

[Claims] 1. A leak in which a primary coil connected to an AC power supply is wound around the first non-open leg, and a secondary coil and a tertiary coil are wound around the second non-open leg and the open leg, respectively. Type tripod transformer, a first switching circuit that receives the voltage across the tertiary coil to perform a switching operation, and controls the AC power supply and the well pump motor to be in a connected state, and a switching operation that receives a firing signal. Then, the second switching circuit that controls the heating circuit that generates heat when energized and the AC power supply are connected to each other, and the current that flows in the well pump motor is detected. The overcurrent detection circuit that outputs the prohibition signal of No. 1 and the ambient temperature of the well pump are measured, and if the temperature is higher than the high temperature set temperature, the second prohibition signal is output. Ignition A temperature measuring circuit that outputs a signal, and a signal that indicates an operating state of the well pump
And a drive control circuit that outputs a drive signal on condition that the second prohibition signal is not output, and a short circuit that short-circuits the secondary coil in synchronization with the drive signal. Well pump control device.