JP2667459B2 - Pump control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pump control device.

[Prior Art] Buildings and pumps used for a water supply or drainage system, which is a sanitary facility of a building, are indispensable facilities for a building function, and a breakdown is not allowed during operation of the building. However, because of the mechanical equipment, temporary stoppage including inspection and repair may occur.

In preparation for this situation, two pumps are normally arranged for one water supply or drainage system, and when normal, an automatic switching circuit is used to output a liquid level detection signal or the like as shown in FIG. In conjunction with the control signal, the two pumps are operated alternately one by one as shown in FIGS. 5 (b) and (c).
At the time of abnormality or inspection, one unit is disconnected from the system, and the equipment is configured so that the remaining one unit can continue automatic operation.

In order to further enhance the reliability of the system as described above, some systems have a backup function.

In other words, in the water supply system, the water level in the water tank continues to decrease, and the liquid level sensor detects abnormal liquid level, even though the liquid level detection signal corresponding to the water supply request is output from the liquid level detection sensor consisting of a so-called floatless relay. When a detection signal is output, it is determined that the system is not operating normally, and the pump that operates by forcibly switching the automatic switching circuit is switched from the currently operating pump to the inactive pump. There is (hereinafter referred to as backup function).

In the drainage system, the liquid level in the receiving tank continues to increase even though the liquid level detection sensor outputs a liquid level detection signal corresponding to the drainage request, and the liquid level detection sensor generates an abnormal liquid level detection signal. In the case of output, it is determined that water is flowing in beyond the drainage capacity of the pump due to concentrated torrential rain and the like, and two pumps are operated simultaneously in parallel to improve the drainage capacity (hereinafter, referred to as “drainage capacity”). Backup function).

Of course, such a backup function of both systems,
Can also be applied to the other system.

However, in the case of a water supply system, when two pumps are operated at the same time and water is sent to the water tank by a pipe, the pipe diameter is limited to a certain size, so even if the power of the pump operation is doubled, the work of pumping work Although the power is not doubled, the power distribution equipment must have a capacity that can transmit power for two pumps.

On the other hand, in the case of a drainage system, since water is only sent from the basement to the ground, the head of the water is reduced and piping can be done with a thick pipe. For this reason, if two pumps are operated, twice as much drainage is possible, and concentrated torrential rain can naturally occur in the natural environment. Therefore, simultaneous operation can be performed even if the power distribution installation is enhanced.

[Problems to be Solved by the Invention] Forcible switching means provided for operating a backup function corresponding to both systems as described above,
Conventionally, a pump control device which can select each function is provided by providing a circuit for taking in an abnormal liquid level detection signal through a connector corresponding to each of the simultaneous operation means. If the capacity of the water tank is basically small and the backup function is selected during use and a liquid level detection sensor such as a floatless relay is used, the abnormal liquid level detection output at abnormal water reduction has a hysteresis characteristic. The abnormal liquid level detection output may be intermittent in a short time because
The operation of the two pumps is alternately switched within a short time.

Here, in the case of wiring equipment in which the pumps 1a and 1b are connected to the power supply through the same motor breaker 2 as shown in FIG. 6 without considering the simultaneous operation, the starting current of two pumps is supplied to one motor breaker 2. Continuously flows through the motor breaker 2
Had a problem of tripping.

Also, the abnormal liquid level detection signal to the simultaneous operation means corresponding to the backup function is input via the latch circuit, but even if the backup function is not set and the latch circuit malfunctions due to external noise etc. In this case, there is a possibility that the simultaneous operation means operates and the two pumps 1a and 1b are simultaneously operated. In the figure, A is a pump control device, S _1a and S _1b are switching contacts of an electromagnetic contactor for pump operation, 3
Is an ammeter.

The present invention has been made in view of the above-described problems. According to the invention of claim 1, when one of the pumps is forcibly operated at an abnormal liquid level, even if there is chattering of the abnormal liquid level detection signal, It is another object of the present invention to provide a pump control device capable of preventing an unnecessary trip of a motor breaker while maintaining a forced switching state.

Further, the invention according to claim 2 is 2 due to external noise or the like.
An object of the present invention is to provide a pump control device that prevents two pumps from being operated simultaneously.

[Means for Solving the Problems] The invention according to claim 1 is an automatic switching means for alternately operating two pumps in response to a control signal corresponding to detection of an upper liquid level or a lower liquid level of a liquid level sensor. And a forcible switching means for forcibly operating the non-operation side pump in response to the liquid level abnormality detection signal, wherein the liquid level sensor detects an abnormal liquid level, an upper liquid level, and a lower liquid level, respectively. A latch circuit for latching and outputting a liquid level abnormality detection signal corresponding to abnormal liquid level detection of the liquid level sensor and resetting the latch in response to the control signal. The liquid level abnormality detection signal is input to the forced switching means via the circuit.

Further, the invention according to claim 2 is an automatic switching means for alternately operating two pumps in response to a control signal corresponding to detection of an upper liquid level or a lower liquid level of a liquid level sensor, and an abnormality of the liquid level sensor. And a simultaneous operation means for forcibly operating two pumps in response to a liquid level abnormality detection signal corresponding to the liquid level detection. A latch circuit for resetting the latch in response to the input signal, a liquid level abnormality detection signal is input to the simultaneous operation means via the latch circuit and the switch means, and the simultaneous operation output is faster than the operation output of the automatic switching means. Output.

[Operation] According to the first aspect of the present invention, once the abnormal liquid level detection signal is input, the latch circuit latches the abnormal liquid level detection signal until reset by the control signal. The forced operation of the pumps can be maintained, and even if the abnormal liquid level detection signal causes chattering, the two pumps are not switched and operated.

Further, according to the second aspect of the present invention, even if the output of the latch circuit changes due to external noise, the signal from the latch circuit is not input to the simultaneous operation means due to the turning off of the switch means, thereby preventing malfunction. In addition, even if the simultaneous operation means operates in the state where the simultaneous operation is set, the operation output is given priority over the operation output of the automatic switching circuit, so that the operation of the automatic switching circuit can be ignored.

EXAMPLES The present invention will be described below with reference to examples.

FIG. 1 shows the overall configuration of a pump control device, in which a signal from a liquid level detecting electrode provided in a water supply tank 4 such as an elevated water tank used for a water supply system or a water receiving tank 5 used for a drainage system is inputted. In the case of the water supply tank 4, when the liquid level becomes lower than the predetermined liquid level, the control contact 6a is turned on, and the ON state is maintained until the liquid level rises to the predetermined liquid level. A liquid level detection sensor 6 that turns on the contact 6a and turns on the control contact 6a until the liquid level drops to a certain level.
And a control unit 7 having control functions such as automatic switching operation, simultaneous operation, and forced switching operation, and a control signal transmitted to the control unit 7 in accordance with ON / OFF of the control contact 6a. According to the pump
A transmission control unit 9 having a function of controlling the electromagnetic contactors 8a and 8b for turning on and off 1a and 1b and a function of detecting a pump operation and returning a detection signal to the control unit 7; A liquid level detection signal is input to display the fullness or low water level of the water supply tank 4 with the display lamps L ₁ and L ₂ of the display unit 10, or if the water supply tank 5 is full, the display lamps L ₃ and L ₄ are used. A display control unit 11 that outputs a signal for displaying the water reduction, and an abnormal liquid level detection signal is generated from the display unit 10.The abnormal liquid level detection signal is supplied to the input terminal of the connector 24a. You can connect by.

FIG. 2 shows a specific circuit of the transmission control unit 9 in FIG.
The figure shows a specific circuit of the control unit 7, respectively.
The transmission control unit 9 is a control contact 6a of the liquid level detection sensor 6.
Photocoupler PH but the control signal input circuit 12 to turn on the photocoupler PH ₁ is energized via a diode bridge DB ₁ This ON is turned on, to the control signal input circuit 12
₁ and the transistor Q ₁ when the photocoupler PH ₁ is on.
Off, through the issuance diodes LED ₁ control signal and the diode D ₁ turns on the transistor Q ₂ and the control signal transmission circuit 13 is output from terminal M _3, each pump 1a, electromagnetic contactor 8a corresponding to 1b, the 8b An operation signal consisting of a half-wave of AC power supply (24 V) is supplied from the control unit 7 to the terminal
If you enter through M _1, M _2, and an output relay circuit 14a or 14b respectively exciting the relay X ₁ or X _2, the relay X ₁ or X ₂
This There detects the excitation current flowing into the electromagnetic contactor 8a or 8b corresponding through the relay contact x ₁ or x ₂ upon turning on the relay contact x ₁ or x ₂ is excited by the current transformer 15a or 15b When the detection level exceeds a certain level, the detection element IC _1a or IC _1b
The operation detection circuit 16a that turns on the transistor Q _3a or Q _3b at the output of and generates an electromagnetic contactor operation detection signal is 16b,
The output of this operation detection circuit 16a or 16b is the transistor
_Turn on Q _4a or Q _4b, and excite the relay X ₁ or X ₂ through the diode D _2a or D _2b , the emitting diode LED _2a or LED _2b, and the terminal M ₁ or M _{2 of the} output relay circuit 14a or 14b. Operation return signal transmission circuit 17 for transmitting an operation return signal to the control unit 7 when the half-wave is opposite to the operation signal flowing
have the a or 17b as a basic configuration, an electromagnetic contactor 8a or contact SW _a or SW _b for abnormality detection, such as a thermal relay that is inserted in series with the 8b electromagnetic contactor 8a or optionally
When switching from the NC contact on the 8b side to the NO contact side, a failure signal input circuit 18a or 18b that energizes and turns on the photocapri PH _2a or PH _2b via the diode bridge DB _2a or _2b , and the failure signal input circuit 18a or 18b Photo coupler PH _2a or PH
_2b ON OFF transistor Q _5a or Q _5b during and intermittently turns on and off by the flicker signal FS the transistor Q _6a or Q _6b, as with intermittently operated return signal a fault signal via terminal M ₁ or M ₂ A failure signal transmission circuit 19a or 19b for transmitting to the control unit 7 is provided.

The control unit 7 includes a control signal receiving circuit 20 for receiving a control signal from the transmission control unit 9 and a signal receiving circuit for receiving an operation return signal or a failure signal from the corresponding circuit.
21a, 21b, an automatic switching circuit 22 for alternately operating the pumps 1a, 1b, and a connector from the display unit 10.
Abnormal fluid level detection signal to the input latch circuit 23 for latching the through 24a, function setting by shorting between terminals 25 _1, 25 ₂ in the connector 24b is tried, the latch circuit 23 through the terminal 25 _1, 25 between ₂ The function is set by connecting the connector 24a while the connector 24b is not connected to the simultaneous operation circuit 26 that operates when the liquid level abnormality is detected by inputting the latch output of the latch circuit 23, and the latch output of the latch circuit 23 is input. A forced switching circuit 27 that operates when a liquid level abnormality is detected.
"OFF", and displays the setting state of the switch SW ₁ for setting the modes of the "test" pump 1a, or operating switched 1b alternately set whether to operate only the pump 1a or pump 1b a switch position display circuit 28 for displaying the setting state of the switch SW _2, and a driving state display circuit 29 to operate in the signal receiving circuit 21a, 21b output.

Thus to now changeover switch SW ₁ when put into "automatic" side contact s _11, s ₁₁ 'are both turned on, light emitting diode LED _a1 switch position display circuit 28 is turned on. When the changeover switch SW ₂ is turned on to the “alternate operation” side, the contacts s ₂₂ ,
Both s ₂₂ ′ are turned on, and the light emitting diode LED _b2 is turned on.

When the control signal from the transmission control unit 9 This setting is input through the terminal M _3, and the transistors Q _7, Q ₈ are both on the control signal receiving circuit 20, the transistors Q _8, the contact s _11,
At s ₁₂ , an operation signal is output to the output relay circuit 14 a of the transmission control unit 9 via the a contact of the switching contact r ₁ of the latching relay Ry of the automatic switching circuit 22 and the terminal M ₁ .
ON base current flows through the base to the light emitting diode LED _3a of the transistor Q ₉ by this operating signal current,
This on the relay X ₁ is excited by, the relay contacts x ₁
Turn on. The on electromagnetic contactor 8a and excitation current flows through the electromagnetic contactor 8a is turned on the switching contact S _1a, the operation of the pump 1a drive current flows to the pump 1a is initiated through the switching contact S _1a.

Secondary output is generated at the same time current transformer 15a and energizing of the electromagnetic contactor 8a, the operation detection circuit 16a by the secondary output turns on the transistor Q _3a. This on the by the transistor Q _4a is on the driver response signal transmitting circuit 17a, the diode D _2a by the on, light emitting diode LED _2a, the transmission of driving reply signal to the control unit 7 through a terminal M ₁ is performed. A signal receiving circuit 21a of the control unit 7
Photo coupler PH _3a of turns on. The photocoupler transistor Q ₁₀ of PH _3a of on the operating state display circuit 29 is turned on, causing the light emitting diode LED ₄ that displays during operation of the pump 1a.

On the other hand, when the control signal described above is received in the control signal receiving circuit 20, and turned on the base current flows to the base of the transistor Q ₁₁ of the automatic switching circuit 22, further base current flows through the transistor Q ₁₂ by the on transistor Q ₁₂ is turned on, further transistors Q ₁₃ this oN is turned on is forward biased by the zener diode ZD _1. By turning on this transistor Q _13, the transistor Q ₁₃ and the relay
Circuit current flows between the reset coil RS and the capacitor C ₁ of the relay Ry through a contact of the switching contacts r ₂ of Ry, filling the capacitor C ₁ via the reset coil RS. In the OFF state at this time the transistor Q ₁₄ is reverse biased.

Transistor Q ₁₅ by the control signal in the latch circuit 23 is turned on, and the R terminal of the latch ICs 23a "L". At this time, if an abnormal liquid level detection signal is not input from the display unit 10 to the S terminal of the latch IC 23a through the connector 24a, the Q output becomes "L".

When the liquid level reaches a predetermined liquid level by the operation of the pump 1a, the control contact 6a of the liquid level detection sensor 6 is turned off. Hotokapuri PH ₁ control signal input circuit 12a by the off off. Transistor to Q ₁ further control signal transmitting circuit 13 by the OFF ON, the transistor Q ₂ is turned off, transmission of the control signal is stopped. By stopping the transmission of the control signal, the transistors Q ₇ and Q 7 of the control signal receiving circuit 20 of the control unit 7 are stopped.
₈ is turned off, so that the output to the output relay circuit 14a on the transmission control unit 9 side is stopped, and at the same time, the power supply to the automatic switching circuit 22 is also stopped.

Output relay circuit relay X ₁ in 14a becomes unexcited, the relay contact x ₁ is turned off. Turn off this electromagnetic contactor
The excitation current of 8a is cut off, its switching contact _S1a turns off,
This turning off stops the operation of the pump 8a.

On the other hand, the secondary current of the current transformer 15a of the operation detection circuit 16a is not generated due to the interruption of the exciting current of the electromagnetic contactor 8a, and the transistor _Q3a is turned off by stopping the generation. By this turning off, the transmission of the operation return signal from the operation return signal transmission circuit 17a to the control unit 7 is stopped, and the photocapri PH _3a of the signal reception circuit 21a of the result control unit 7 is turned off. The transistor Q ₁₀ off the operating state display circuit 29 is turned off, turns off the light emitting diode LED _4. At the same time the transistor Q ₁₆ is a light emitting diode LED ₅ is lit on, pump 1a, 1b to indicate that in the stopped state.

On the other hand, since the energization of the automatic switching circuit 22 is stopped,
The transistors Q ₁₁ , Q ₁₂ and Q ₁₃ are all turned off.
Reset coil RS This off transistor Q ₁₄ is turned on to release the charge of capacitor C ₁ through the diode D _a, invert drive the relay Ry. Due to this reversal, both the switching contacts r ₁ and r ₂ are switched from the a contact to the b contact. By this switching, when the control contact 6a of the liquid level detection sensor 6 is turned on next, the control signal input circuit 12,
Under the operation of the control signal transmission circuit 13, the control signal reception circuit 20, and the output relay circuit 14b, the operation of the pump 1b is started in the same manner as in the case of the pump 1a, and the operation detection circuit 14
b, the action of the group of the operation response signal transmission circuit 17b, and turns on the photocoupler PH _3b of the signal receiving circuit 21b, so the light emitting diode LED ₆ turns on the transistor Q ₁₇ of the operating state display circuit 29 by the on, Display that pump 1b is in operation.

In this way, each time the control contact 6a is turned on, the pump 1
a and 1b are automatically switched alternately and operated.

By the way, in a state where the terminals 25 ₁ and 25 ₂ are not short-circuited by the connector 24b, that is, in a state where the function setting of the simultaneous operation circuit 26 is not performed and the above-described pump 1a or 1b is operating, the abnormal liquid level is displayed from the display unit 10 side. When the detection signal is input, the latch IC 23a of the latch circuit 23 inverts the Q output to “H”. This reversal photocoupler PH ₄ in forced switching circuit 27 transistors Q ₁₈ is turned on is turned on. Accordingly and in series connected to the collector of the transistor Q ₁₂ of the automatic switching circuit 22, the phototransistor of the photocoupler PH ₄ to connect in parallel to the zener diode ZD ₁ which is connected to the base of the transistor Q _13, the Zener diode ZD ₁ is Shorted and transistor Q ₁₃ turns off. This transistor Q ₁₃
Off transistor Q ₁₄ is turned on by the, the charges of the capacitor C ₁ or C ₂ is connected in series to the reset coil RS or set coil S is discharged through the diode D _a or D _b, force the relay Ry Invert. This inversion causes the control signal receiving circuit 20 to output the output relay circuit 14a or 14b.
The power supply is switched to 14b or 14a, and the pump 1a or
The operation of 1b is switched to the other pump 1b or 1a.

When a large number of abnormal liquid level detection signals are input as shown in FIG. 4B while the control signal is being transmitted as shown in FIG. 4A, the S terminal of the latch IC 23a of the latch circuit 23 is output. There is a set input as shown in FIG.
Since the R terminal is “L” as shown in FIG.
As for the Q output of 23a, the Q output at the time of the first set input is held until the control signal is lost and the R terminal becomes “H” as shown in FIG. If it does, the pump does not switch.

When the backup function for simultaneous operation is set by short-circuiting the terminals 25 ₁ and 25 ₂ with the connector 24b, when the Q output of the latch IC 23a becomes “H”, the transistor Q ₁₈ is turned on. 26 transistor Q ₆ is turned on, and relays X ₁ , X from control signal receiving circuit 20 to output relay circuits 14 a, 14 b through transistor Q ₆ and diodes D _A , D _B , respectively.
The current for driving ₂ flows, the relays X ₁ and X ₂ are excited, and both pumps 1a and 1b are operated at the same time.

When the simultaneous operation circuit 26 operates, the forced switching circuit 27
Also it serves, but to reverse the relay Ry of automatic switching circuit 22, since the ON operation of the transistor Q ₆ is earlier than reversing operation of the relay Ry, so that the operation of the automatic switching circuit 22 is ignored.

Note be set by introducing a contact s _12, s ₁₂ of the switch SW ₁ 'to "OFF", the pump 1a, 1b operation is stopped,
The light emitting diode LED _a2 of the switch position display circuit 28 lights up, and the “OFF” setting state is displayed. Similarly, contact s ₁₃ ,
By inputting s ₁₃ ′ and setting “test”, it is possible to set a state in which an operation signal can be output without receiving a control signal from the transmission control unit 9. In this state, light emission of the light emitting diode LED _a3 is displayed.

The 'When you put the switch in the side "pump 1", a state in which operation of the pump 1a only performed, also contacts s _23, s _23' switching contact s _21, s ₂₁ of the switch SW ₂ by introducing the "pump When it is inserted into the "2" side, only the pump 1b can be operated. These switching states _{depend on} the light emitting diode LED _b1 ,
_Each is displayed by the light emission of LED _b3 .

When the pump 1a or 1b fails, the signal receiving circuit 21a
Alternatively, an intermittent signal is supplied to the fault signal transmitting circuit 18a or 18b to 21b.
transmitted from b, photocouplers PH _3a or PH _3b is turns on and off the transistor Q ₁₀ or Q ₁₇ of the operating state display circuit 29 turns on and off, to blink the light emitting diode LED ₄ or LED _6. This blinking indicates that the corresponding pump 1a or 1b is out of order.

The present invention is not particularly limited to the circuit of the above embodiment.

[Effect of the Invention] The invention according to claim 1 is an automatic switching means for alternately operating two pumps in response to a control signal corresponding to detection of an upper liquid level or a lower liquid level of a liquid level sensor, and a liquid level abnormality. In a pump control device comprising a forced switching means for forcibly operating a non-operation side pump in response to a detection signal, a liquid level sensor includes a set of liquid levels for detecting an abnormal liquid level, an upper liquid level, and a lower liquid level, respectively. A latch circuit that latches and outputs a liquid level abnormality detection signal corresponding to abnormal liquid level detection of the liquid level sensor, and resets the latch in response to the control signal. Since the abnormal liquid level detection signal is input to the forced switching means, once the abnormal liquid level detection signal is input, the latch circuit latches the abnormal liquid level detection signal until reset by the control signal. It is possible to maintain the forced operation state of one pump by the switching means, and there is an effect that the two pumps are not switched even if the abnormal liquid level detection signal causes chattering.

The invention according to claim 2 is an automatic switching means for alternately operating two pumps in response to a control signal corresponding to detection of an upper liquid level or a lower liquid level of a liquid level sensor, and an abnormal liquid level of the liquid level sensor. And a simultaneous operation means for forcibly operating two pumps in response to a liquid level abnormality detection signal corresponding to the level detection. A latch circuit for resetting the latch in response to the input of an abnormal liquid level detection signal to the simultaneous operation means via the latch circuit and the switch means, and outputting the simultaneous operation output earlier than the operation output of the automatic switching means; Therefore, even if the output of the latch circuit changes due to external noise, a signal from the latch circuit is not input to the simultaneous operation means due to the turning off of the switch means, thereby preventing malfunction. It is. In addition, even if the simultaneous operation means operates in the state where the simultaneous operation is set, the operation output has priority over the operation output of the automatic switching circuit, so that the operation of the automatic switching circuit can be ignored.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is a specific circuit diagram of a transmission control unit of the above, FIG. 3 is a specific circuit diagram of a control unit of the same embodiment, and FIG. 5 is a time chart for explaining the operation of the circuit, FIG. 5 is a time chart for explaining the alternate operation of the pump, and FIG. 6 is a circuit configuration diagram for explaining the operation of the conventional example. 1a, 1b pump, automatic switching circuit 22, 23 latch circuit, the connector 24b, 25 _1, 25 ₂ connection terminals, simultaneous operation circuit 26, 27 is forced switching circuit.

Claims (2)

(57) [Claims] An automatic switching means for alternately operating two pumps in response to a control signal corresponding to detection of an upper liquid level or a lower liquid level of a liquid level sensor; In a pump control device provided with a forced switching means for forcibly operating an operation side pump, the liquid level sensor includes a set of liquid level sensors for detecting an abnormal liquid level, an upper liquid level, and a lower liquid level, respectively. A latch circuit that latches and outputs a liquid level abnormality detection signal corresponding to the sensor abnormal liquid level detection and resets the latch in response to the control signal is provided, and the liquid level abnormality detection signal is forced through this latch circuit. A pump control device characterized by inputting to a switching means. 2. An automatic switching means for alternately operating two pumps in response to a control signal corresponding to detection of an upper liquid level or a lower liquid level of a liquid level sensor, and detection of an abnormal liquid level of the liquid level sensor. And a simultaneous operation means for forcibly operating the two pumps in response to the liquid level abnormality detection signal corresponding to the above. A latch circuit for resetting the latch by inputting a liquid level abnormality detection signal to the simultaneous operation means via the latch circuit and the switch means, and outputting the simultaneous operation output earlier than the operation output of the automatic switching means. A pump control device.