JPH06280782A - Pump device - Google Patents

Abstract

PURPOSE:To form a device in a compact state and to reduce a cost by a method wherein a motor for driving a pump is started and stopped based on the pressure and a flow rate of pump delivery water and two capacitors for running and a starting a motor are opened and closed by means of a semiconductor switching element. CONSTITUTION:When the generation of a delivery pressure is reduced, an ON signal is outputted from a pressure switch 10, and the output of an inverter 66 is brought into an L state through a diode 64 and when the output of hold rotation 38 is L, the output of an NOR circuit 40 is brought into an H state. In which case, a transistor 41 is turned ON and a TRIAC 43 is turned ON through a photo coupler 42 to run a motor 1. A signal from an inverter 66 is transmitted to a resistor 75 and a capacitor 76 and the capacitor 76 is changed from H into L. Further, an inverter 78 is brought into an H-state and a photo coupler 103 and a TRIAC 102 is brought into an OFF-state. As a result, two capacitors 52 and 53 for operation and starting are energized and a capacitor 53 for starting is released after a lapse of a given time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a pump device having a control box.

[0002]

2. Description of the Related Art FIG. 3 shows, for example, JP-A-57-93693.
In the conventional pump device shown in Japanese Patent Publication, 1 is a motor, 2
Is a pump, 3 is a flow rate switch for detecting the flow rate on the discharge side, 4 is an accumulator, 5 is a pressure switch, 6 is a faucet, and 7 is a control device for driving and controlling the motor 1 based on signals from the flow rate switch 3 and the pressure switch 5. is there.

Next, the operation will be described. When the faucet 6 is opened, the pressure of the accumulator 4 decreases, the pressure switch 5 is closed, the signal is input to the control device 7, and the motor 1 starts operating. Next, when the pump 2 starts the water supply operation, the flow rate switch 3 is closed, the signal is similarly input to the control device 7, and then the operation is continued even if the pressure switch 5 is opened. On the other hand, when the faucet 6 is closed, pressure is accumulated in the accumulator 4, the flow rate switch is opened, the signal is input to the control circuit 7, and the motor 1
Is stopped.

Further, referring to FIG. 2, an example of using a mechanical voltage relay having an operating capacitor and a starting capacitor will be described for the operation of the control circuit. In the figure, 10 is a pressure switch that is turned on when the discharge pressure of the pump 2 is below a specified value, 11 is a flow switch that is turned on when the feed water flow rate of the pump 2 is above a specified value, and 12 is a pressure switch.
This is an output delay circuit that delays when both 10 and the flow switch 11 are turned off and turns it off.
It is composed of 14 and. Reference numeral 15 is an inverter that inverts a signal, 17 is a thermistor whose resistance value changes according to temperature, 18 is a resistor that is connected in series to the thermistor 17 and outputs the divided voltage a, 19, 20, 21, 22 are resistors. The divided voltage of 19 and 20 is set lower than the divided voltage c of the resistors 21 and 22. Reference numeral 23 is a comparator which outputs the output level L by judging that the divided voltage a is low when the divided voltage a is low with reference to the divided voltage b, and 24 is a change L of the output level of the comparator 23.
Resistance that gives hysteresis to H, H → L, 25 is partial pressure c
If the divided voltage a becomes high with reference to
The comparators 26 and 30 for outputting the OR are diodes for OR connection. In addition, the thermistor 17, resistors 18, 19, 20, 2
The temperature detecting means 15 is composed of 1, 22, the comparators 23, 25, and the diode 26. 38 is a hold circuit that outputs the output level H and maintains the signal when the output level of the comparator 25 becomes H, 39 is a manual reset circuit that resets the held signal of the hold circuit 38,
40 is a NOR circuit which receives the outputs of the hold circuit 38 and the inverter 15 as input, 41 is a transistor which is turned on / off according to the output of the NOR circuit 40, 42 is a photocoupler, and 43 is a triac which is turned on / off by the signal of the photocoupler 42. Is. A hold circuit 38, a manual reset circuit 39,
The NOR circuit 40, the transistor 41, the photocoupler 42, and the triac 43 constitute a motor stop means 44. 45 is a NOR circuit that inputs comparators 23 and 25, 46 is a transistor, 47 is a photocoupler, 48 is a triac, and 49 is a freeze prevention heater that is adhered to the outer surface of the casing of the pump 2 with a heat conductive adhesive. is there.

Further, the motor 1 starts operating when the triac 43 is turned on, and when the number of revolutions exceeds a certain value, the contact 54 is turned off and only the operating capacitor 52 is operated. 50 is the main difference line, 51 is the auxiliary difference line, and 52 is the operating capacitor, which is always energized during one revolution of the motor. 53 is a starting capacitor, which is energized only at the moment when the motor 1 is started. The contact 54 is turned on and off by the coil 55, and the coil 55 detects the voltage of the auxiliary coil 51. The contact 54 and the coil 55 form a voltage relay 56.

[0006]

Since the conventional pump device is constructed as described above, it requires a voltage relay having contacts in addition to the control device, and has a short contact life and a contact noise. There is a problem that the motor does not rotate except when the water is not flowing to the pump, the pressure switch and the flow switch are turned on and off, and the large voltage output motor does not know the voltage drop at startup. .

The present invention has been made in order to solve the above problems. A timer circuit for disconnecting the starting capacitor circuit is provided, and protection operation is stopped after a predetermined time when only the pressure switch is operated. Further pressing the reset button will rotate the motor. Another object of the present invention is to obtain a pump device with improved reliability such as displaying when the voltage drops.

[0008]

The pump device according to the present invention improves reliability by computerizing the start-up capacitor disconnection circuit, further adds protection against water drainage, and presses the reset button from the outside to provide the motor. Can drive.
Further, it has a feature that a voltage drop can be judged.

[0009]

The circuit for disconnecting the starting capacitor according to the present invention uses a semiconductor as its switch, and further has a circuit for stopping the motor when only the pressure switch is turned on and after a lapse of a predetermined time, the motor is stopped. Further, the motor is rotated by pressing the reset button. The display is possible when the voltage drops.

[0010]

【Example】

Example 1. An embodiment of the present invention will be described below. In FIG. 1, reference numeral 12 is an output delay circuit which delays the pressure signal when the pressure switch 10 is switched to the off signal and outputs the off signal.
It consists of 13 and capacitor 14. Reference numeral 64 is a diode for OR connection. Reference numeral 63 denotes an output delay circuit that delays the flow signal when the flow rate switch 11 is switched to an off signal to be an off signal, and is composed of a resistor 61 and a capacitor 62. Reference numeral 65 is a diode for OR connection. 66 is an inverter that inverts a signal, 100 is a resistor, 101 is a coil, 102 is a triac, and 103 is a photocoupler. 75 and 77 are resistors, and 76 is a capacitor. A CR timer having a certain time constant is composed of the resistor 75 and the capacitor 76. Reference numeral 78 is an inverter that inverts a signal to drive the photocoupler 103 connected to the auxiliary winding. 74 is a diode whose output side is connected to the capacitor 76. 68 is a signal inversion inverter, 70 and 72 are resistors, 71 is a capacitor, 69 and 73 are diodes, and the resistor 70 and the capacitor 71 constitute a CR timer having a certain time constant. 79 is a transformer, 80
Is a rectifier circuit, 81 is a transistor, and 82 is a zener diode for generating a reference voltage. 83 is a capacitor, a transformer
79, rectifier circuit 80, transistor 81, Zener diode 8
2. The capacitor 83 constitutes a constant voltage for the control circuit. 84 and 85 are resistors for voltage division, and 87 and 88 are for generating a reference voltage by voltage division. 86 is a capacitor, 89 is a comparator, 90 is a resistor L → H, H → H of the comparator 89
The change in L has a hysteresis. Reference numeral 92 is an indicator light. The description of other symbols is the same as that of FIG. 2 and is omitted.

Next, the operation will be described. First, when the faucet (not shown) is opened, the discharge pressure decreases, the pressure switch 10 outputs an ON signal, the output of the inverter 66 becomes L via the diode 64, and the output of the hold circuit 38 becomes L.
Then, the output of the NOR circuit 40 becomes H and the transistor 41
Is turned on, the triac is turned on through the photocoupler 42, and the motor 1 is operated. Inverter 66 at the same time
Is transmitted to the resistor 75 and the capacitor 76, and the capacitor 76 changes from the H state to the L state. Since the inverter 78 sets the output to H after the lapse of the specified value due to the voltage drop of the capacitor 76, the photocoupler 103 changes from ON to OFF after the lapse of the time, and the triac 102 also performs the same operation. Therefore, the capacitor 52 and the capacitor 53 are energized at the same time as the motor is energized, but the capacitor 53 is cut off after a lapse of a specified value time from the motor rotation, and only the capacitor 52 is operated.

Since the water flow is generated by the rotation of the motor and the flow rate switch 11 is turned on, the inverter 66 is connected via the diode 65.
Since the signal is transmitted to the motor 1, the operation of the motor 1 is continued even if the pressure switch 10 is turned off.

Next, when the faucet is closed, first the pressure switch 10 is turned off, then the flow rate switch 11 is turned off, the outputs of the diode 65 and the inverter 66 are delayed through the delay circuit 63, and L → H changes. . Therefore, the NOR circuit 40 outputs the L signal to the transistor 41, so that the triac 43 is turned off and the motor 1 is stopped. The voltage of the capacitor 76 becomes H according to the H of the inverter 66 and becomes triac 102.
Is turned on, but since the triac 43 is turned off before that, the motor 1 remains stopped and waits for the next rotation.

The resistor 105 connected to the capacitor 53 is a discharging resistor. Further, the coil 101 and the resistor 100 are connected in series in order to prevent a short-circuit current of the capacitors 52 and 53 due to a malfunction due to noise during discharging of the capacitor 53. Have Furthermore, the use of the zero-cross type for the photocoupler 103 reduces the short-circuit mode.

Next, when the temperature of the pump casing to which the thermistor 17 is attached becomes low, the resistance of the thermistor 17 rises, the divided voltage a falls below the divided voltage b, and the comparator 23 outputs the L signal to the NOR circuit 45. When the comparator 25 is L, the NOR circuit 45 outputs H to turn on the transistor 46 and the triac through the photocoupler 46.
48 is turned on and the heater 49 is energized. The thermistor again
If the temperature of 17 rises, the resistance of the thermistor 17 will decrease,
The H of the comparator 23 outputs, the NOR circuit 45 outputs L, the triac 48 turns off, and the power supply to the heater 49 is stopped.

When the pump 2 is operated with the faucet closed, the internal water temperature of the pump 2 rises sharply and the thermistor 17
Resistance decreases, the divided voltage a becomes higher than the divided voltage c, the comparator 25 outputs H, the hold circuit 38 outputs H to the NOR circuit, and maintains the signal. Therefore, even if the signals from the pressure switch 10 and the flow rate switch 11 are H, the NOR circuit 40 continues to output L, and the motor 1 is stopped.

Because of such a structure, it is smaller than the conventional voltage relay, and problems such as contact noise and life of the contact are solved, and further, the manufacturing cost is reduced.

Next, when only the pressure switch 10 is turned on and the flow rate switch 11 is not turned on, the resistance of the CR timer circuit is used.
After the lapse of a specified time by the 70 and the capacitor 71, H is input to the hold circuit 38 through the diode 73 and the operation of the motor 1 is stopped. In this case, if the flow rate switch 11 is turned on within the specified time, the charging voltage of the capacitor 71 is discharged from the diode 69 through the inverter 68 and returns to the normal state.

As described above, when only the pressure switch 10 is turned on and the flow rate switch is turned off for a predetermined time or more, the motor 1 is stopped to play a role of preventing an abnormal state of the pump 2.

As described above, in order to protect the state in which only the pressure switch is on and the flow rate switch is off, it is necessary to combine with a water level relay separately, and that water level relay requires specialized knowledge in selection and installation. Although the installation required a number of days, in the present application, since it is integrated on the control circuit, additional work at the time of installation can be omitted.

Further, in the high temperature state or the water running state, the motor 2 is stopped by the hold circuit 38, but when the reset switch 104 is pressed to release the state, the H signal is output to the capacitor 76 through the diode 74. Therefore, since the motor 1 is operated in a state where the capacitors 52 and 53 are connected together, the effect can be obtained by pushing the reset switch 104 when it is desired to rotate with a large torque for repair or the like.

Next, the resistors 84 and 85 detect a signal obtained by dropping the AC 100 V by the transformer 79 and full-wave rectifying it by the bridge 80. This is because the reference voltage is compared by the resistors 87 and 88 and the comparator 89 is used. The indicator lamp 92 is turned on and off. It should be noted that the resistance so that it does not operate with an instantaneous voltage drop.
A capacitor 86 is connected in parallel with 85 because of the CR time constant. The resistor 90 outputs the output signal of the comparator 89 from L → H,
The purpose is to have a hysteresis that changes from H to L.

Therefore, in the case where the AC side power supply voltage drops in a pump with a large motor output, it was necessary to measure the voltage value by using various other measuring instruments. It is possible to judge low pressure.

Example 2. In the above embodiment, the coil 101 and the resistor 100 are provided in series with the starting capacitor 53 to provide short-circuit protection. However, if the internal resistance is large due to the nature of the capacitor itself, the coil 101 and the resistor 100 become unnecessary.

Further, although the CR circuit is used in the timer circuit, even if a timer IC or the like is used in this portion, the same effect as in the above embodiment can be obtained.

[0026]

As described above, according to the present invention, the control circuit for starting and stopping the pump driving motor is provided based on the signals of the pressure switch and the flow rate switch which are operated by the discharge water of the pump, and Since a semiconductor switching element that opens and closes a circuit for a motor starting capacitor and a circuit for operating a capacitor is incorporated in the control circuit, the circuit can be efficiently configured, and therefore a compact and inexpensive pump device is provided. You can Moreover, the switching element is made into a semiconductor, so frequent start-up,
Even when stopped, it has excellent effects such as high reliability and long life.

[Brief description of drawings]

FIG. 1 is an example of an embodiment circuit diagram of the present invention.

FIG. 2 is an example of a conventional circuit.

FIG. 3 is a configuration diagram of a pump device of this type.

[Explanation of symbols]

 1 Motor 2 Pump 3 Flow Switch 4 Accumulator 5 Pressure Switch 10 Pressure Switch (Contact) 11 Flow Switch (Contact) 42 Photocoupler 43 TRIAC 52 Operating Capacitor 53 Starting Capacitor 70 Resistance 71 Capacitor 74 Diode 75 Resistance 76 Capacitor 77 Resistance 84 resistance 85 resistance 86 condenser 87 resistance 88 resistance 89 comparator 90 resistance 92 indicator lamp 100 resistance 101 coil 102 triac 103 photocoupler 104 reset switch 105 resistance

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsunori Makiyama 1-1-1, Imajuku Higashi, Nishi-ku, Fukuoka City Fukuryo Semicon Engineering Co., Ltd. (72) Inventor Kiyohiro Matsue Nagao, Minamitaku Town, Taku City, Saga Prefecture 3898 Taku Electric Co., Ltd.

Claims (6)

[Claims] 1. A pump driven by a single-phase motor having a starting capacitor and an operating capacitor, and control for starting and stopping the motor based on signals from a pressure switch and a flow rate switch operated by the discharge water of the pump. Circuit, a first switching semiconductor element that opens and closes the main power supply circuit of the motor based on a control signal of the control circuit, and a second switching semiconductor element that is connected in series to the starting capacitor and opens and closes the circuit. A pump device comprising: a second switching semiconductor element which is turned off after the motor is started, and the starting capacitor circuit is disconnected. 2. The pump device according to claim 1, wherein the second switching semiconductor element is operated by a timer to disconnect the starting capacitor circuit. 3. The first and second switching elements are bidirectional switching elements, and a control signal is input to a control electrode of the bidirectional switching element via a photocoupler. Pump device. 4. A pump driven by a motor, a control circuit for starting and stopping the motor on the basis of signals from a pressure switch and a flow rate switch operated by the discharge water of the pump, and the pressure when the discharge pressure of the pump decreases. If the above-mentioned flow rate switch does not operate after a specified time after the switch operates,
A pump device comprising a protection circuit for stopping energization of the motor. 5. A pump driven by a motor, a control circuit for controlling start and stop of the motor based on signals of a pressure switch and a flow rate switch operated by discharge water of the pump, and stopping supply to the motor in an abnormal state. A pump device comprising a protection circuit for enabling the motor to be forcibly started by a reset switch of the protection circuit. 6. A pump driven by a motor, a control circuit for starting and stopping the motor on the basis of signals from a pressure switch and a flow rate switch operated by discharge water of the pump, and a voltage supplied to the motor to a predetermined value. A pump device provided with a display means for displaying the decrease below.