JPS6024958Y2 - Pump automatic control device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatic pump control device that utilizes an AC control element to detect two points such as liquid level and operate a pump or the like in hysteresis.

When performing water supply and drainage work using a pump, the pump is activated when the drainage liquid level reaches a preset upper limit, taking into consideration pump protection and economical use, and the pump is activated when the drainage liquid level reaches the lower limit. Hysteresis control is used to stop the pump when the

When performing the above control, the detection part for liquid level etc. must be electrically insulated from the power supply part because the liquid number is touched directly or touched by the operator when adjusting the detected value. .

Furthermore, in order to drive the pump from the upper limit to the lower limit of the liquid level, it is necessary to continue outputting the drive signal.

Incidentally, in recent years, AC control elements such as thyristors and triacs have been used in the control circuits to reduce their size. The configuration and the configuration for outputting the drive signal are complicated.

With the above points in mind, the object of this invention is to provide a pump automatic control device with a simple configuration that utilizes an AC control element to ensure the above-mentioned electrical insulation and drive signal generation.

In order to achieve the above object, this invention includes a detection section that detects two different points and generates a first signal and a second signal, and uses the first signal to operate a pump drive section such as a motor. , a control circuit that is stopped by a second signal, a first AC control element connected in series with the drive unit to the AC power source, a primary side of a transformer connected to the AC power source via a first load, and a transformer. A second AC control element connected to the secondary side of the AC control element via a second load, and a third load connected in series to the second load between the control terminals that turn on the AC control element. The first signal applies the secondary voltage of the transformer to the third load, the second signal forms a closed circuit between the second load and the third load, and the first load is connected to the third load. The load is inserted between the control terminals of the first AC control element, and one of the second load and the third load is an energy storage element.

In the control device configured in this way, the liquid level detection part connected to the secondary side and the power supply part connected to the primary side are electrically isolated by the transformer, and when the liquid level etc. rises, When the first signal is emitted from the detection section, both the first and second AC control elements are turned on and this state is maintained, the drive section is operated, and the pump is operated.

During this operation, the liquid level and the like drop, and when the second signal is issued, the first and second AC control elements are turned off and the pump is stopped via the drive section.

By repeating such an operation, the pump performs a hysteresis operation.Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in FIG. 1, the detection unit 1 includes two reed switches 3ay3b that are settable and supported inside the cylindrical body 2;
It consists of a float 5 that incorporates a magnet 4 and is slidably provided around the periphery of the cylinder 2, and stoppers 6 that are fixed above and below the cylinder 2 so that the float 5 does not separate from the cylinder 2.

The reed switches 3a and 3b are the upper limit of the liquid level, respectively.
It detects the lower limit, and generates a detection signal by closing the contact while detecting the magnet 4.

Next, to explain the control circuit based on the detection unit 1, as shown in FIG. The primary sides of the transformers are connected to each other via a resistor 10, and the resistor 10 is inserted between the first anode T1 of the first triax 7 and the data 16.

The second triax 11 has a first anode T1' connected to a resistor 1.
The 27th node T2' is directly connected to one end of the secondary side of the transformer 9 through the gate G.
' are connected to one end of the secondary side of the transformer 9 via the capacitor 13, and the upper limit reed switch 3a is connected to the second end of the transformer 9.
A lower limit reed switch 3b is inserted between the first anode T2' and the gate G', and between the first anode T2' and the gate G'.

In the control circuit configured as described above, the first triax 7 is turned on when the second triax 11 is on, and is turned off when the second triax 11 is off.

This occurs when the second triax 11 is off and the transformer 9
If the secondary side of the transformer 9 is not energized, the impedance of the transformer 9 is sufficiently large so that the gate current of the first triax 7 is not reached, but when the second triax 11 is on, the secondary side of the transformer 9 is energized. As the impedance of the transformer 9 decreases, the first triax 7
This is because the gate current increases.

Further, the second triax 11 operates after the upper limit detection reed switch 3a closes the contact point and then the lower limit detection reed switch 3b
The on state is maintained until the contact point is closed by the lower limit reed switch 3b, and the off state is maintained from the time the lower limit reed switch 3b closes the contact point until the upper limit reed switch 3a closes the contact point.

That is, when the upper limit reed switch 3a closes the contact, a gate current flows to the second triac 11, and the second triac 11 is maintained in an on state.

Next, when the upper limit reed switch 3a opens the contact, since the capacitor 13 is charged by the gate current of the triac 11, the first
, second anode T1. Even if the current across T2 falls below the holding current, the second triac 11 is triggered again by the capacitor 13 and remains on.

However, when the lower limit reed switch 3b closes the contact,
The first anode T1' of the second triax 11 and the gate G
Since the voltage across ' becomes zero, the second triax 11 is turned off and the capacitor 13 is completely discharged by the resistor 12.

Therefore, even if the lower limit reed switch 3b opens the contact, the second triax 11 will not open the upper limit reed switch 3a.
remains off until the contacts close.

A case will be described in which the pump is controlled by the detection unit 1 and control circuit as described above.

When the upper limit reed switch 3a detects the magnet 4 of the float 5 and closes the contact as the liquid level of the waste water or the like in which the detection unit 1 is installed rises, the second triax 11 and the first
Both triaxes 7 are turned on, and the pump drive motor 8 is activated, causing the pump to operate.

When the pump operates, the liquid level drops and the lower limit reed switch 3b closes the contact, which causes the second triax 11 and the first
The triax 7 stops the pump together with the motor 8.

By repeating such an operation, the pump performs hysteresis operation.

Next, FIGS. 3 and 4 show another example of the present invention, which uses a float switch as the detection section.

This detection unit has float switches 14a and 14b fixed to a pump installed in a tank that stores water supply and drainage water, and the float switches 14a and 14b close their contacts when detecting the liquid level. It is.

The control circuits shown in FIGS. 2 and 4 operate in exactly the same way except that the reed switches 3a, 3b and the float switches 14a, 14b operate in the same way.

In addition, in Figures 2 and 4, triac 7.11
may be an AC control element such as a thyristor, or the resistor 12 and capacitor 13 on the secondary side of the transformer 9 may be one resistor and the other an energy storage element such as a coil or capacitor, without changing the parts. is optional.

Further, the detection unit 1 is for detecting the liquid level.

This idea works as described above, and the input AC power source and the detection part can be completely isolated by a transformer, so even if you accidentally come into contact with electricity when adjusting the detection part, you will not get an electric shock. Excellent safety.

Furthermore, since no relays are used, it can be made compact and has the advantage that the circuit configuration is extremely simple.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an example of the detection section of this invention, Fig. 2 is a circuit diagram showing an example of this invention, Fig. 3 is an explanatory diagram showing another example of the detection section, and Fig. 4 is an explanatory diagram of the control circuit. FIG. 7 is a circuit diagram showing another example. 1...Detection part, 2...Cylinder body, 3a, 3
b...Reed switch, 4...Magnet,
5...Float, 6...Stopper
7,11...triac, 8...motor, 9...transformer, 10,12...
・Resistor L13...Capacitor, 14a, 14b・
...Float switch.

Claims (1)

[Scope of utility model registration request] A control circuit is provided with a detection unit that detects two different points and generates a first signal and a second signal, and operates a pump drive unit such as a motor based on the first signal and stops it using the second signal. a first AC control element connected in series with the transformer, a primary side of the transformer connected to the AC power source via a first load, and a secondary side of the transformer connected via a second load. It consists of a second AC control element and a third load connected in series to the second load between the control terminals that turn on the AC control element, and the third load is connected in series to the second load by the first signal.
Applying the secondary voltage of the transformer to the load ', and forming a closed circuit between the second load and the third load by the second signal,
A pump automatic control device characterized in that the first load is inserted between the control terminals of the first AC control element, and further, either the second load or the third load is an energy storage element. .