JPS61283793A - Well pump controller - Google Patents

Abstract

PURPOSE:To ensure safety of a device by stopping a motor when a condition discriminating means detects abnormal conditions, and operating a heat generating means when it detects low temperatures. CONSTITUTION:A condition discriminating means 6 is installed to discriminate the condition of a well pump and turn on/off the first switching circuit 2 according to the condition discrimination output. And a temperature sensor 7 to detect the temperature near a pump motor, and a low temperature detecting circuit 8 to turn on the second switching circuit 5 when the temperature is under a fixed value are also installed. Therefore, it is possible to automatically stop operation of the well pump motor when the temperature is high or there is excess current, and to prevent freezing by raising the temperature around the motor when the temperature is low.

Description

[Detailed Description of the Invention] (a) Industrial Application Field This invention relates to a well pump control device, particularly a well pump control device that ensures the safety and integrity of the pump motor, etc. when an abnormality occurs in the well pump. Regarding.

(b) Conventional technology A well-known well pump control device is equipped with a pressure switch on the water outlet side of the pump, and when the faucet is opened to supply water,
When the pressure in the pressure switch decreases, the switch turns on, which drives the pump motor to pump water, and when the pressure increases, the motor stops. Furthermore, when the faucet is closed while the motor is running, the pressure in the pressure switch increases, turning off the switch and stopping the pump motor. In addition, in this type of well pump control device,
In order to prevent pump motors from freezing and breaking when used in winter or in cold regions, some pumps are treated with so-called antifreeze treatment, such as by turning on light bulbs to suppress the temperature drop.

(c) Problems to be solved by the invention In the above-mentioned conventional well pump control device, in order to prevent freezing,
It is used to turn on and off light bulbs, but since turning on and off light bulbs is done by humans based on their judgment, it was difficult to handle. In order to make handling easier, it may be possible to leave the lights on all day or during the call, but in that case, the lights would be on even when the temperature is relatively low or high and there is no need to turn on the lights, which would be uneconomical. It is.

In addition, the well pump control device may be operated idly depending on the state, which may cause the pump motor to overheat and lead to a dangerous situation. In addition, sometimes an overcurrent may flow through the pump motor, and this condition can be dangerous if left untreated.

However, the reality is that conventional well pump control devices do not take any special automatic safety measures against overheating and overcurrent.

In view of the above, the present invention provides the following advantages:
Or conversely, it is an object of the present invention to provide a well pump control device that can safely protect the device even in high temperature or overcurrent conditions.

(d) Means and operation for solving the problems The well pump control device of the present invention includes an AC power source (1, 21) and a well pump motor (2, 2) driven by the AC power source.
2), and a heat generating means (3,
23), a first switching circuit (2, 24) connected in series to the well pump motor to drive and control the well pump motor, and a first switching circuit (2, 24) connected in series to the heat generating means to drive and control the heat generating means. a second switching circuit (5, 25) for discriminating the state of the well pump, and a state discrimination means (6) for turning on and off the first switching circuit according to the state discrimination output; A temperature sensor (7, 45) that detects the temperature in the vicinity, and a low temperature detection circuit (8) that turns on the second switching circuit when the temperature detected by the temperature sensor is below a predetermined value.
, 46).

In this well pump control device, when the state discrimination means discriminates an abnormal state of the well pump, the first switching circuit is turned off by the discrimination output, and the operation of the well pump motor is stopped. Further, when the low temperature detection circuit detects a low temperature, the second switching circuit is turned on, and the heat generating means starts generating heat to be heated. Therefore, freezing of the pump motor etc. is prevented.

(E) Examples The present invention will be explained in more detail with reference to Examples below.

<Embodiment 1> Fig. 1 is a schematic circuit block diagram of a well pump control device showing an embodiment of the present invention. In Fig. 1, a well pump motor 2 and a first switching circuit 4 are connected in series. This series circuit is connected in parallel to a 100V AC power supply 1. Further, a heat generating means 3 such as a heater used for anti-freezing and a second switching circuit 5 are connected in series, and this series circuit is also connected in parallel to the AC power supply 1.

The first and second switching circuits 4.5 both use non-contact circuits including triacs and the like.

The temperature sensor 7 is a thermistor, and is provided near the installation location of the motor 2 of the well pump, and is provided to detect the ambient temperature. A temperature signal from this temperature sensor 7 is applied to a low temperature detection circuit 8.

The low temperature detection circuit 8 outputs a signal with a logic state of "1" when the ambient temperature drops to such an extent that water freezes, and this signal turns on the second switching circuit 5.

The pressure switch 9 and the flow switch 10 are switches provided in the well pump as in the conventional case, and the ON signals of these switches 9 and 10 are applied to the logic circuit 11, and the logic circuit 11 is connected to both the switches 9 and 10. The first switching circuit 4 is turned on and off in accordance with the on/off of the logic state, that is, the change in the logic state. In this embodiment, a pressure switch 9, a flow switch 10, and a logic circuit 11 constitute a state discrimination circuit 6.

Next, the overall operation of this embodiment device will be explained.

When the ambient temperature is normal temperature, the low temperature detection circuit 8 does not output the signal "1" indicating low temperature detection, the second switching circuit 5 is not turned on, and therefore no current flows through the heat generating means 3, causing no heating. Not done.

Under this condition, when the pressure switch 9 is turned on, the logic circuit 11 outputs a signal "1" and turns on the first switching circuit 4, thereby causing the pump motor 2 to start operating. Next, when the flow switch 10 is turned on, even if the pressure switch 9 is turned off, the logic circuit 11 will
Mu the output of the signal "1" as it is. Therefore, the pump motor 2 continues to operate as it is. Then, when the pressure switch 9 and the flow switch 7 10 are turned off, the logic circuit 11 outputs a signal "0" at this point and turns off the switching circuit 4. As a result, the pump motor 2 also stops.

When the ambient temperature drops to such an extent that the water freezes, the low temperature detection circuit 8 outputs a signal "1", and the second switching circuit 5
Turn on. As a result, current flows through the heat generating means 3, generating heat and heating the surroundings. Therefore, the surrounding area is maintained at a temperature above freezing.

<Embodiment 2> FIG. 2 is a schematic circuit block diagram of a well pump control device showing another embodiment of the present invention.

This embodiment device further adds a high temperature detection circuit 12 to the device shown in FIG. The circuit 12 outputs a signal "1", and the logic circuit 11 uses this signal "1" to forcibly turn off the switching circuit 4. If the temperature of the pump motor 2 increases due to idle operation or the like, the switching circuit 4 is turned off to stop the pump motor 2 in order to avoid this danger. The structure and operation of the other parts are the same as in the first embodiment, so the explanation thereof will be omitted.

<Embodiment 3> FIG. 3 is a schematic circuit block diagram of a well pump control device showing still another embodiment of the present invention.

This embodiment device further includes a current transformer 13 in addition to the device of embodiment 2.
and an overcurrent detection circuit 14 are added. Current transformer 1
3 is provided in a series circuit between the pump motor 2 and the switching circuit 4, and detects the current flowing through the pump motor 2. When this current exceeds a predetermined value, the overcurrent detection circuit 14 outputs a signal "1", and the logic It is designed to be added to the circuit 11. The logic circuit 11 forcibly turns off the switching circuit 4 by this signal "1".

When an excessive current flows due to a short circuit in the pump motor 2 circuit, the switching circuit 4 is turned off and the pump motor 2 is stopped in order to avoid damage to the device. The configuration and operation of other parts are the same as in the second embodiment, so the explanation will be omitted.

<Embodiment 4> FIG. 4 is a circuit block diagram of a well pump control device showing still another embodiment of the present invention.

This embodiment device is a more practical and concrete version of the device of embodiment 3.

The series circuit of the pump motor 22 and the first switching circuit 24 and the series circuit of the antifreeze 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, reversely connected diodes 27 and 28, a tripod transformer 29, and the like. The tripod transformer 29 includes a negative coil L+, a secondary coil L2, and a tertiary coil.

The tripod transformer 29 turns into a tertiary coil when the upper 2 side of the secondary coil is short-circuited.

A low voltage is generated, and a voltage higher than the trigger gate voltage is applied between the terminal T1 and the gate 0 of the triac 26 via the reversely connected diodes 27 and 28, so that the triac 26 is fully fired.

The second switching circuit 25 includes a triac 30,
It is composed of an ignition circuit 31 for igniting the triac 30, and the like, and the ignition circuit 31 includes a phototransistor 33 of a photocoupler 32.

The primary coil L of the tripod transformer 29 is connected to the AC power supply 21, and the AC voltage derived to the upper 2 side of the secondary coil is rectified by the rectifier circuit 34, stabilized by the constant voltage circuit 35,
Power supply voltage is applied to each part of the electronic circuit. Further, a light emitting diode 36 for operation display and a transistor 37 for shorting the secondary coil are connected to the secondary coil L2 of the tripod transformer 29.

Signals from the well pump's pressure switch 38, flow switch 39, and water cutoff relay 40 are input to a logic circuit 41. For example, when the pressure switch 38 is turned on, the logic circuit 41 outputs the signal a at rlJ and the subsequent flow switch 39
When the logic circuit 41 is 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 starts the timer circuit 43 upon receiving the ON signal from the pressure switch 38, and resets the timer circuit 43 when the flow switch 39 is subsequently turned ON.

If a predetermined time elapses without the timer circuit 43 being reset, a time-up signal is input to the output discrimination circuit 42.

The oscillation circuit 44 has a frequency of several K+Iz to more than ten KHz (e.g. 1
A signal of 8 KHz) is oscillated and applied to the output signal discrimination circuit 42 and the gate circuit 48. When a signal for turning on the pump motor 22 is applied from the logic circuit 41, the output signal discrimination circuit 42 applies a signal from the oscillation circuit 44 to the transistor 37, and uses this signal to turn on the tripod transformer 2.
The secondary coil L2 of No. 9 is short-circuited and opened. As a result, the back electromotive force of the signal is superimposed on the AC signal from the AC power supply 21 in the secondary coil L, and as a result, a relatively large power supply voltage is obtained in the constant voltage circuit 35. .

A temperature sensor 45 provided near the pump motor 22 inputs its detected temperature signal to a high temperature comparison circuit 46 and a low temperature comparison circuit 47. The high temperature comparison circuit 46 inputs a signal C to the output signal discrimination circuit 42 when the detected temperature reaches a predetermined value or higher. Further, the low temperature comparator circuit 47 applies a high signal to the gate circuit 48 when the detected temperature becomes a low temperature below a predetermined value, and inputs the signal from the oscillation circuit 44 to the transistor 49. A light emitting diode 5o of the photocoupler 32 is connected to this transistor 49, and when the transistor 49 is turned on/off, the light emitting diode 5o blinks and lights up, sending light to the phototransistor 33 of the ignition circuit 31 and turning on the triac 30. It is shaped like an arc.

In addition, a current transformer 51 is coupled to the first switching circuit 24 to derive the current flowing to the pump motor 22, and an inrush current disabling circuit 52 disables excessive values due to inrush current, etc., and a current comparator circuit 53 In this case, when the current is above a predetermined value, a prohibition signal d is inputted to the output signal discrimination circuit 42.

Next, the operation of this embodiment device will be explained.

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 the triac 30 is not fired and no current flows to the antifreeze heater 23.

When the pressure switch 38 is turned on in this temperature state, upon receiving this signal, the logic circuit 41 starts the timer circuit 43 and provides the signal a to the output signal discrimination circuit 42. The output signal discrimination circuit 42 applies the signal from the oscillation circuit 44 to the transistor 37 based on this signal.

The transistor 37 is turned on and off by this high frequency signal, and short-circuits and opens the secondary coil L2 of the tripod transformer 29. When a short circuit occurs, a voltage is induced in the tertiary coil of the tripod transformer 29, and the triac 26 is turned on.
Pump motor 22 starts operating.

While normal operation continues, the current obtained in the current value comparison circuit 53 via the current transformer 51 is minute;
3 does not output the prohibition signal d.

When the pressure switch 38 is turned on and the flow switch 39 is turned on, the timer circuit 43 is reset. However, the signal a is continuously applied from the logic circuit 41 to the output signal discrimination circuit 42, the transistor 37 continues to be turned on and off, and the pump motor 22 continues to operate. Even if the pressure switch 38 is turned off, there is no change in the output of the logic circuit 41.

When the flow switch 39 turns off following the pressure switch 38 off, the logic circuit 41 turns the signal off. As a result, the output signal discrimination circuit 42 prohibits the signal from the starting circuit 44 from being applied to the transistor 37. Therefore,
The transistor 37 is turned off, the secondary coil Lt of the tripod transformer 29 is opened, no voltage is induced in the tertiary coil, the triac 26 is turned off, and the operation of the pump motor 22 is stopped.

Next, if the flow switch 39 is not turned on after the pressure switch 38 is turned on, the timer circuit 43 times up and inputs a prohibition signal to the output signal discrimination circuit 42. In this case, the output signal discrimination circuit 42 prohibits the signal from the starting circuit 44 from being applied to the transistor 37, so that the operation of the pump motor 22 is stopped.

When the ambient temperature rises too much, the high temperature comparator circuit 46 outputs a prohibition signal C, which is input to the output signal discrimination circuit 42. Further, when an excessive current flows through the pump motor 22, a prohibition signal is outputted from the current value comparison circuit 53 and inputted to the output signal discrimination circuit 42. In these cases as well, the operation of the pump motor 22 is stopped.

The output signal discrimination circuit 42 has a function of holding a prohibition signal,
If any of the prohibition signals S, C, or D is input and the operation of the pump motor 22 is stopped, even if the prohibition is canceled, the operation of the pump motor 22 will remain prohibited unless it is manually reset (for example, by turning off the power). continue.

On the other hand, when the water cutoff switch 40 is turned off due to a water cutoff, the logic circuit 41 turns off the signal a. Upon receiving 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, so that the pump motor 22 is immediately restarted in this case.

When the season reaches winter and the ambient temperature becomes low, the low temperature comparison circuit 47 outputs a high signal when the temperature detected by the temperature sensor 45 falls below a predetermined value, and the signal from the starting circuit 44 is passed to the gate circuit 4 days later. It will be input to the transistor 49 via. This signal turns on/off the transistor 49, and accordingly the light emitting diode 50 of the photocoupler 32 is turned on/off.
lights up blinking. Then, the phototransistor 33 of the photocoupler 32 receives the flashing light, the ignition circuit 31 is activated, the triac 30 is ignited, current flows to the antifreeze heater 23, the antifreeze heater generates heat, and the ambient temperature is raised.

In this embodiment, in 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. The pump motor 22 may be turned on when either the pressure switch 38 or the pz shift of the flow switch 39 is on.

(f) Effects of the Invention According to the well pump control device of the present invention, since the operation of the well pump motor is controlled depending on the state of the well pump, the operation of the well pump motor is automatically stopped in the event of high temperature or overcurrent, for example. The safety of the equipment can be ensured. Further, when the temperature becomes low enough to freeze, this is detected and the heat generating means is activated to raise the ambient temperature, so it is possible to avoid destruction of the device due to freezing.

[Brief explanation of drawings]

FIG. 1 is a schematic circuit block diagram of a well pump control device showing one embodiment of the present invention, and FIGS. 2 and 3 are schematic circuit block diagrams of a well pump control device showing other embodiments of the present invention. , FIG. 4 is a circuit block diagram of a well pump control device specifically showing still another embodiment of the present invention. 1.21: AC power supply, 2.22: Well pump motor, 3.23: Heat generating means, 4.24: First switching circuit, 5.25: Second switching circuit, 6: State discrimination means, 7: Temperature sensor, 8: Low temperature detection circuit, 12: High temperature detection circuit, 14: Overcurrent detection circuit.

Claims (4)

[Claims] (1) An AC power source, a well pump motor driven by the AC power source, a heat generating means that generates heat when energized by the AC power source, and a series connection to the well pump motor to drive and control the well pump motor. a first switching circuit connected in series to the heat generating means for driving and controlling the heat generating means; and a second switching circuit connected in series to the heat generating means to drive and control the heat generating means; a state discriminator that turns on and off the first switching circuit; a temperature sensor that detects the temperature near the pump motor; and a temperature sensor that turns on the second switching circuit when the temperature detected by the temperature sensor is below a predetermined value. A well pump control device consisting of a low temperature detection circuit. (2) The well according to claim 1, wherein the state discrimination means includes a pressure switch and a flow switch, and turns on and off the first switching circuit according to the on/off logical states of these switches. Pump control device. (3) The state discriminating means includes a high temperature detection circuit that receives the detection output of the temperature sensor and detects that the temperature is equal to or higher than a predetermined value, and the high temperature detection output of the high temperature detection circuit is used to control the first switching circuit. The well pump control device according to claim 1, wherein the well pump control device is configured to turn off the well pump. (4) The state discrimination means includes an overcurrent detection circuit that detects that the current flowing through the pump motor exceeds a predetermined value, and turns off the first switching circuit with the output of the overcurrent detection circuit. Claim No. 1
The well pump control device described in Section 1.