CN211855490U - Liquid level centralized control alarm system - Google Patents
Liquid level centralized control alarm system Download PDFInfo
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- CN211855490U CN211855490U CN202020298196.8U CN202020298196U CN211855490U CN 211855490 U CN211855490 U CN 211855490U CN 202020298196 U CN202020298196 U CN 202020298196U CN 211855490 U CN211855490 U CN 211855490U
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Abstract
The utility model provides a liquid level centralized control alarm system, its characterized in that: including liquid level detector, automatic control circuit, manual control circuit, system backbone circuit, alarm circuit, be used for to the power supply circuit of automatic control circuit and liquid level detector power supply, liquid level detector connects the liquid level signal transmission that automatic control circuit will detect and gives automatic control circuit, and automatic control circuit drives the motor action through the three normally open contact of control ac contactor, and manual control circuit is connected the three normally open contact drive motor action through control ac contactor with system backbone circuit, and alarm circuit is connected with automatic control circuit and is used for motor exception to report to the police. The system realizes automatic liquid level control, does not overflow or lack water, and does not need to watch on duty; the intelligent control system has the functions of liquid level display, automatic control, water full, fault alarm and the like, achieves the purposes of ensuring safe operation and reducing labor intensity, and has wide application scenes and strong universality.
Description
Technical Field
The utility model relates to a liquid level centralized control alarm system.
Background
The water level control methods in use at present mainly include the following types:
1) electrode type water level control system: and detecting the water level by using a plurality of electrode wires to contact with the water surface.
The advantages are that: the price is low.
The disadvantages are as follows: the water level control method has the advantages that the switching value is controlled, the actual water level cannot be given, the detection electrode is easy to corrode, the installation is inconvenient, and if dirt adheres to the electrode, the water level is out of control.
2) A floating ball water level controller: is divided into a tubular floating ball and a cable floating ball. The tubular floating ball is suitable for clear water and liquid with low viscosity. The cable floater is suitable for sewage.
The advantages are that: the price is moderate, and the control of high, low, super high and super low can be made.
The disadvantages are as follows: the actual water level cannot be given due to the control of the switching value; dirt is easily adhered to the floating ball, so that the floating ball cannot reliably act, the tubular floating ball is easily blocked, the cable floating ball is easily wound, all the floating balls have poor contact, and the system is out of control; it is inconvenient to adjust the control point.
3) Liquid level transmitter and intelligent controller mode
The advantages are that: the method belongs to analog quantity control, can display water level values in real time, and can give early warning to water level runaway or equipment faults. Double-pump intelligent control is integrated, and the control system is simple in wiring. The control device can be used for controlling high, low, ultrahigh and ultralow points, and the control points are set on the controller, so that the control device is extremely convenient. The intelligent controller can be connected with a computer in a network, and can remotely monitor the water level and the operation condition of equipment.
The disadvantages are as follows: the price is high.
4) Ultrasonic liquid level controller
The advantages are that: the method belongs to analog quantity control, can display water level values in real time, and can give early warning to water level runaway or equipment faults. Double-pump intelligent control is integrated, and the control system is simple in wiring. The control device can be used for controlling high, low, ultrahigh and ultralow points, and the control points are set on the controller, so that the control device is extremely convenient. The intelligent controller can be connected with a computer in a network, and can remotely monitor the water level and the operation condition of equipment. The sensor is not contacted with the substance to be measured, and is suitable for controlling the liquid level of sewage and toxic and harmful liquid.
The disadvantages are as follows: the price is high. Is not suitable for the occasions with a large amount of bubbles on the water surface.
Basement reservoir and roof life fire reservoir generally adopt traditional displacement floater formula water level control system, because the height drop fluctuation of floor and equipment old ageing, the water overflow and the fault condition of cutting off the water supply frequently appear in original displacement floater formula water level control system.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the existing water level control system often has the phenomena of water overflow and water cut-off, and can not master the water level condition in time.
In order to solve the problem, the technical scheme of the utility model provides a liquid level centralized control alarm system, its characterized in that is provided: the automatic liquid level detection system comprises a liquid level detector, an automatic control circuit, a manual control circuit, a system trunk circuit, an alarm circuit and a power supply circuit, wherein the power supply circuit is used for supplying power to the automatic control circuit and the liquid level detector, the system trunk circuit comprises three normally open contacts of a switch QS, a fuse FU and an AC contactor KM1 and three normally open contacts of an AC contactor KM2, the input end of the fuse FU is connected with a three-phase power supply through the switch QS, the three output ends of the fuse FU are respectively connected with the input ends of the three normally open contacts of the AC contactor KM1 and the input ends of the three normally open contacts of the AC contactor KM2, the output ends of the three normally open contacts of the AC contactor KM1 and the output ends of the three normally open contacts of the AC contactor KM2, the automatic control circuit drives the motor M to act through three normally open contacts of the control alternating current contactor KM1, the control motor M stops storing water when the liquid level rises to the upper limit liquid level, the control motor M starts storing water when the liquid level drops to the lower limit liquid level, the manual control circuit is connected with the system main circuit and drives the motor M to act through three normally open contacts of the control alternating current contactor KM2, and the alarm circuit is connected with the automatic control circuit and used for abnormal alarm of the motor M.
Preferably, the liquid level detector is an electrode type liquid level sensor, and the electrode type liquid level sensor is provided with an upper limit liquid level sensing electrode B for detecting an upper limit liquid level and transmitting an electric signal to the automatic control circuit, a lower limit liquid level sensing electrode A for detecting a lower limit liquid level and transmitting an electric signal to the automatic control circuit, and a power supply electrode C connected with the power circuit.
Preferably, the sensing electrode B, the sensing electrode A and the power supply electrode C are arranged in the container through an insulating support, the sensing electrode B is arranged at the position of the upper liquid level limit on the insulating support, the sensing electrode A is arranged at the position of the lower liquid level limit on the insulating support, and the power supply electrode C is arranged at the position of the lowest liquid level on the insulating support.
Preferably, the manual control circuit comprises a change-over switch SA, a stop button SB1 and a start button SB2, an input end of the change-over switch SA is connected to an H-phase output end of the fuse FU through a thermal relay FR1, an output end two of the change-over switch SA is connected to one end of a stop button SB1, the other end of the stop button SB2 is connected to one end of a start button SB2 and an input end of a normally open auxiliary contact of an ac contactor KM2, the other end of the start button SB2 and an output end of the normally open auxiliary contact of the ac contactor KM2 are connected to one end of a coil of the ac contactor KM2, the other end of the coil of the ac contactor KM2 is connected to one end of a coil of the ac contactor KM1 and an I-phase output end of the fuse FU, and the other end of the coil of the ac contactor KM1 is connected in.
Preferably, the automatic control circuit comprises a triode V1, a triode V2, a triode V3, a relay K1, a relay K2 and a coil of a relay K3, the output end of the power circuit is respectively connected with the collector of the triode V1, the collector of the triode V2, the collector of the triode V3, the normally-open contact of the relay K1 and the common end of the relay K2, the emitter of the triode V1 is respectively connected with the cathode of the diode D2 and one end of the coil of the relay K1, the anode of the diode D2 is grounded, the other end of the coil of the relay K1 is respectively connected with the reference ground and the normally-closed contact of the relay K1, the common end of the relay K1 is connected with the first input pin of the nand gate N1, the output pin of the nand gate N1 is respectively connected with one end of the resistor R4 and the second input pin of the nand gate N3, the second input pin of the nand gate N3 is connected with the output pin of the nand gate N3, two input pins of the NAND gate N2 are connected with an emitter of a triode V2, an emitter of a triode V2 is grounded through a resistor R3, the other end of the resistor R4 is connected with a base of a triode V3, an emitter of a triode V3 is respectively connected with a cathode of a diode D4 and one end of a coil of a relay K2, an anode of a diode D4 and the other end of the coil of the relay K2 are grounded, a normally closed contact of the relay K2 is grounded through the coil of the relay K3, a base of a triode V1 is connected with a sensing electrode A, and a base of a triode V2 is connected with a sensing electrode B.
Preferably, the alarm circuit comprises a buzzer, a thermal relay FR2 and a normally open auxiliary contact of an alternating current contactor KM1, one end of the buzzer is connected with the output end of the normally open auxiliary contact of the alternating current contactor KM1 and the output end of the thermal relay FR2 respectively, the other end of the buzzer is grounded, the input end of the normally open auxiliary contact of the alternating current contactor KM1 is connected with the emitter of the triode V2, and the input end of the thermal relay FR2 is connected with the emitter of the triode V3.
Preferably, the liquid level display device further comprises a display circuit for displaying the liquid level position, wherein the display circuit comprises a light emitting diode D1 and a light emitting diode D3, the light emitting diode D1 is connected between the emitter of the triode V1 and the diode D2 in a forward direction, and the light emitting diode D3 is connected between the emitter of the triode V2 and the resistor R3 in a forward direction.
Preferably, the power circuit comprises a transformer, the input end of the transformer is connected with a power supply, the output end of the transformer is connected with the input end of the bridge rectifier circuit, the anode of the output end of the bridge rectifier circuit is respectively connected with one end of the filter capacitor C1 and the input end of the three-terminal regulator, and the output end of the three-terminal regulator is connected with the filter capacitor C0The negative electrode of the output end of the bridge rectifier circuit is respectively connected with the other end of the filter capacitor C1, the common end of the three-terminal regulator and the filter capacitor C0And the common end of the three-terminal regulator is grounded.
Compared with the prior art, the beneficial effects of the utility model are that:
the system adopts discrete components to realize the design of the control system, and has the advantages of stable work, simple circuit structure, low manufacturing cost and high sensitivity. The automatic control of the liquid level is realized, no overflow or water shortage is caused, and no person is required to watch on; the stainless steel sensing electrode rods with different preset lengths are arranged in the container and are contacted with or separated from water in the water level change process, so that signals are transmitted to a subsequent circuit, liquid level display, automatic control, water full, fault alarm and the like are realized through the subsequent circuit, the purposes of ensuring safe operation and reducing labor intensity are achieved, and the container is wide in application scene and strong in universality.
Drawings
FIG. 1 is a diagram of a system backbone circuit;
FIG. 2 is a schematic view of a level sensor installation;
FIG. 3 is a diagram of a manual control circuit;
FIG. 4 is a diagram of an automatic control circuit;
FIG. 5 is a diagram of an alarm circuit configuration;
FIG. 6 is a diagram of a power circuit configuration;
fig. 7 is a block diagram of the system operation.
Detailed Description
In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
The utility model relates to a liquid level centralized control alarm system includes liquid level detector, automatic control circuit, manual control circuit, system trunk circuit, alarm circuit, is used for explaining at the reservoir application as the example below to the power supply circuit of automatic control circuit and liquid level detector power supply, the display circuit that shows the liquid level position.
As shown in fig. 1, the system main circuit includes a switch QS, a fuse FU, three normally open contacts of an ac contactor KM1, and three normally open contacts of an ac contactor KM2, an input end of the fuse FU is connected with a three-phase power supply through the switch QS, three output ends of the fuse FU are respectively connected with an input end of three normally open contacts of an ac contactor KM1 and an input end of three normally open contacts of an ac contactor KM2, an output end of three normally open contacts of an ac contactor KM1 and an output end of three normally open contacts of an ac contactor KM2 are connected with a motor M through a thermal relay FR, a liquid level detector is connected with an automatic control circuit to transmit a detected liquid level signal to the automatic control circuit, the automatic control circuit drives the motor M to operate by controlling three normally open contacts of an ac contactor KM1, a manual control circuit is connected with the system main circuit to drive the motor M to operate by, the alarm circuit is connected with the automatic control circuit and used for alarming the abnormity of the motor M.
As shown in figure 2, the liquid level detector selects an electrode type liquid level sensor, the basic principle of the electrode type liquid level sensor is to utilize the physical property that liquid water has certain conductivity, three conductors with different lengths are arranged as electrodes with corresponding functions, the function of the electrode type liquid level sensor for converting liquid level change into corresponding electric signal change is completed by utilizing signals formed by the liquid level change state, the electrode type liquid level sensor has the characteristics of simplicity, reliable transmission and the like, the design is that an insulator bracket is arranged at the bottom of a reservoir, corresponding sensing electrodes are arranged at different positions, an upper limit water level sensing electrode B for detecting upper limit liquid level and transmitting the electric signals to an automatic control circuit, a lower limit water level sensing electrode A for detecting lower limit liquid level and transmitting the electric signals to the automatic control circuit, a power supply electrode C connected with a power supply circuit is arranged at the bottom end, and electrical signals are provided for the sensing electrode A and the sensing electrode B, and when the water level reaches the corresponding positions, the formed electrical signals are transmitted to a subsequent automatic control circuit, so that the rotation and the stop of the motor are controlled.
As shown in fig. 3, the manual control circuit includes a transfer switch SA, a stop button SB1, and a start button SB2, an input end of the transfer switch SA is connected to an H-phase output end of the fuse FU through a thermal relay FR1, an output end two 2 of the transfer switch SA is connected to one end of a stop button SB1, the other end of the stop button SB2 is connected to one end of a start button SB2 and an input end of a normally open auxiliary contact of an ac contactor KM2, the other end of the start button SB2 and an output end of the normally open auxiliary contact of the ac contactor KM2 are connected to one end of a coil of an ac contactor KM2, the other end of the coil of the ac contactor KM2 is connected to one end of a coil of an ac contactor KM1 and an I-phase output end of the fuse FU, and the other end of the coil of the ac contactor KM1 is connected in series to.
As shown in fig. 4, the automatic control circuit includes a transistor V1, a transistor V2, a transistor V3, a relay K1, a relay K2, and a coil of a relay K3, the 12V power supply circuit is respectively connected to a collector of the transistor V1, a collector of the transistor V2, a collector of the transistor V3, a normally open contact of the relay K1, and a common terminal of the relay K2, an emitter of the transistor V1 is respectively connected to a cathode of the diode D2 and one end of the coil of the relay K1, an anode of the diode D2 is grounded, the other end of the coil of the relay K1 is respectively connected to a reference ground and a normally closed contact of the relay K1, the common terminal of the relay K1 is connected to a first input pin of the nand gate N1, output pins of the nand gate N1 are respectively connected to one end of the resistor R4 and a second input pin of the nand gate N3, a second input pin of the nand gate N3 is connected to an output pin of the nand gate N3, two input pins of the NAND gate N2 are connected with an emitter of a triode V2, an emitter of a triode V2 is grounded through a resistor R3, the other end of the resistor R4 is connected with a base of a triode V3, an emitter of a triode V3 is respectively connected with a cathode of a diode D4 and one end of a coil of a relay K2, an anode of a diode D4 and the other end of the coil of the relay K2 are grounded, a normally closed contact of the relay K2 is grounded through the coil of the relay K3, a base of a triode V1 is connected with a sensing electrode A, and a base of a triode V2 is connected with a sensing electrode B.
When the water level of the reservoir is below the sensing electrode A, the triodes V1 and V2 are not conducted, the N1 outputs high level, the triode V3 is conducted, the relay K2 is enabled to have current to pass through for action, and therefore the motor M works and starts to pump water into the reservoir. When the water level of the reservoir is above the sensing electrode A and below the sensing electrode B, the water in the reservoir provides base voltage for the triode V1 to enable the V1 to be conducted, the relay Kl is electrified to attract the first input pin of the N1 to be in a high level, the triode V2 is in a cut-off state without the base voltage, the two input pins of the N2 are in a low level, the output pin of the N2 is in a high level, the input end of the second input pin of the N3 is still in a high level, the output pin of the N3 is in a low level, the output pin of the N1 is in a high level finally, and the motor M continues to suck the water into the reservoir. When the water level of the reservoir exceeds the upper limit water level, the triode V1 still obtains the base voltage, and the relay Kl attracts. The first input pin of N1 is still high level, and simultaneously, the water in the reservoir also provides base voltage for triode V2 to make it turn on, and two input pins input of N2 are high level, and the output of output pin is low level, and the output of N3 output pin is high level, and the output pin of N1 finally outputs low level, makes triode V3 cut off, and motor M stops drawing water. If the water level drops below the sensing electrode B but is higher than the sensing electrode A, the water in the reservoir still supplies the base voltage of the triode V1, the relay Kl is continuously attracted, the first input pin N1 is still at a high level, but the triode V2 is not conducted, the input of the two input pins N2 is at a low level, the output of the output pin N3 is at a high level, the output of the second input pin N3 is at a low level, the output of the output pin N1 is finally kept at a low level, and the motor M still stops working. If the water level drops below the sensing electrode A, the triodes V1 and V2 are not conducted, the NAND gate N1 outputs high level, the relay K2 is driven, and the motor M starts to pump water into the reservoir again.
As shown in fig. 5, the alarm circuit includes a buzzer, a thermal relay FR2 and a normally open auxiliary contact of an ac contactor KM1, one end of the buzzer is connected to the output end of the normally open auxiliary contact of the ac contactor KM1 and the output end of the thermal relay FR2, respectively, the other end of the buzzer is grounded, the input end of the normally open auxiliary contact of the ac contactor KM1 is connected to the emitter of a triode V2, and the input end of the thermal relay FR2 is connected to the emitter of a triode V3. The alarm circuit only alarms when the water level is below the lower water level and the motor is still not working and above the upper water level but the motor is not stopped. The specific analysis is as follows:
when the water level drops below the lower limit water level, the connector G is electrified (the connector E is at a low potential), if the alternating current contactor KM1 does not act at the moment, namely the control circuit goes wrong or the motor M goes wrong (a monitoring point comes from the thermal relay FR2), the alarm circuit is switched on, and thus the alarm is started; when the water level rises to be higher than the upper limit water level, the connector F is electrified, and if the alternating current contactor KM1 is not reset at the moment, the alarm circuit is also switched on, so that the alarm is started.
As shown in fig. 4, the display circuit includes a light emitting diode D1 and a light emitting diode D3, the light emitting diode D1 is connected in series between the emitter of the transistor V1 and the diode D2 in the forward direction, the light emitting diode D3 is connected in series between the emitter of the transistor V2 and the resistor R3 in the forward direction, when the water level is above the lower limit water level, the transistor V1 is turned on, so that the light emitting diode D1 is turned on and lighted, indicating that the water level is above the lower water level; when the water level exceeds the upper limit water level, the triode V2 is conducted, so that the light emitting diode D3 is conducted and lighted, and the water level is above the high water level. The indicator lamp D1 is on, and D3 is not on, which indicates that the water level is in a normal state; d1 not bright indicating a water out condition; d3 light indicating overfill
As shown in fig. 6, the input terminal of the transformer is connected to the power supply, the output terminal is connected to the input terminal of the bridge rectifier circuit composed of 4 diodes, the positive electrode of the output terminal of the bridge rectifier circuit is connected to one terminal of the filter capacitor C1 and the input terminal of the w7812 three-terminal regulator, respectively, the output terminal of the w7812 three-terminal regulator is connected to the filter capacitor C0The negative electrode of the output end of the bridge rectifier circuit is respectively connected with the other end of the filter capacitor C1, the common end of the three-terminal regulator and the filter capacitor C0The other end of the three-terminal voltage stabilizer is grounded, a power circuit converts 220V/50Hz power into 18V power through a transformer, the power circuit is rectified by a diode and filtered by a capacitor C1, and then the power circuit is stabilized by w7812 voltage and C0The filtering of (2) can obtain a Direct Current (DC)12V voltage with low ripple.
The overall operation process of the system is divided into a manual part and an automatic part:
manual operation: the manual operation is to switch the change-over switch SA to the position No. 2 of the output end, press the start button SB2, the alternating current contactor KM2 is electrified, the normally open contact acts the motor M to start working, and the motor M is self-locked; when the motor is stopped, the stop button SB1 is pressed, the AC contactor KM2 loses power, the normally open contact is disconnected, and the motor M stops working.
Automatic: the change-over switch SA is changed to the position of No. 1 at the output end, the water level ratio is lower at the beginning and is below the lower limit water level A, the triode V1 and the V2 are not conducted according to the control circuit, the triode V3 is conducted under the action of the NAND gate, the relay K2 has current to pass through to act, the subsequent electrical appliance K3 is electrified to act, the alternating current contactor KM1 is electrified, the normally open contact is closed, and the motor works. If the motor fails to enable the thermal relay to act (or the alternating current contactor does not act), the alarm system works to start alarming and prompt staff that the water tower fails; when the water level rises above the lower limit water level A, the triode V1 is conducted, but the triode V3 is still in a conducting state due to the function of the NAND gate, so that the motor still works to continuously supply water to the water tower. At the moment, the display system working indicator lamp D1 is lightened, and the water level is indicated to be above the lower limit water level; when the water level rises above the upper limit water level, the triodes V1 and V2 are both conducted, under the action of the NAND gate, the triode V3 is cut off, the relays K2 and K3 are reset, the alternating current contactor KM1 is powered off, the normally open contact is disconnected, and the motor stops working. If the motor does not stop working, the alarm system starts to give an alarm to prompt staff of the fault of the water tower. The display system is also now operating to illuminate indicator light D3 indicating that the water level is above the upper water limit.
As shown in fig. 7, the working principle of the system is shown, when the water level is lower than the lower limit water level, the water pump is started to pump water, and if the water level is not started, an alarm is started; when the water level is higher than the upper limit water level, the water pump stops pumping water, if the water pump continues working, an alarm is given, the automatic control of the water level of the reservoir is realized, all the working cycles of water feeding and water cut-off can be automatically completed, and the water level height of the reservoir is ensured to be always in a more ideal range. The electrode type sensor is arranged above the container, and the sensing electrode is inserted into liquid (divided into a high liquid level and a low liquid level), so that the high liquid level sensing electrode is aligned with the upper limit of the liquid, and the low liquid level sensing electrode is aligned with the lower limit of the liquid. When the water level rises to contact the high liquid level electrode, the sensing electrode transmits the signal voltage to a subsequent circuit, so that the relay switch is controlled to stop storing water. When the water level drops to a position away from the lower liquid level sensing electrode, no signal is transmitted to a subsequent circuit by the electrode, and the relay is started to be switched on for water storage. Therefore, the water level can be correctly measured by contacting and not contacting the water with the sensing electrode, the water level is controlled, and the user can continuously use the water.
Claims (8)
1. A liquid level centralized control alarm system is characterized in that: the automatic liquid level detection system comprises a liquid level detector, an automatic control circuit, a manual control circuit, a system trunk circuit, an alarm circuit and a power supply circuit, wherein the power supply circuit is used for supplying power to the automatic control circuit and the liquid level detector, the system trunk circuit comprises three normally open contacts of a switch QS, a fuse FU and an AC contactor KM1 and three normally open contacts of an AC contactor KM2, the input end of the fuse FU is connected with a three-phase power supply through the switch QS, the three output ends of the fuse FU are respectively connected with the input ends of the three normally open contacts of the AC contactor KM1 and the input ends of the three normally open contacts of the AC contactor KM2, the output ends of the three normally open contacts of the AC contactor KM1 and the output ends of the three normally open contacts of the AC contactor KM2, the automatic control circuit drives the motor M to act through three normally open contacts of the control alternating current contactor KM1, the control motor M stops storing water when the liquid level rises to the upper limit liquid level, the control motor M starts storing water when the liquid level drops to the lower limit liquid level, the manual control circuit is connected with the system main circuit and drives the motor M to act through three normally open contacts of the control alternating current contactor KM2, and the alarm circuit is connected with the automatic control circuit and used for abnormal alarm of the motor M.
2. A centralized liquid level control alarm system as set forth in claim 1, wherein: the liquid level detector is an electrode type liquid level sensor which is provided with an upper limit liquid level sensing electrode B, a lower limit liquid level sensing electrode A and a power supply electrode C, wherein the upper limit liquid level sensing electrode B is used for detecting an upper limit liquid level and transmitting an electric signal to the automatic control circuit, the lower limit liquid level sensing electrode A is used for detecting a lower limit liquid level and transmitting an electric signal to the automatic control circuit, and the power supply electrode C is connected with a power supply circuit.
3. A centralized liquid level control alarm system as claimed in claim 2, wherein: the sensing electrode B, the sensing electrode A and the power supply electrode C are arranged in the container through the insulating support, the sensing electrode B is arranged at the position of the upper liquid level limit on the insulating support, the sensing electrode A is arranged at the position of the lower liquid level limit on the insulating support, and the power supply electrode C is arranged at the position of the lowest liquid level on the insulating support.
4. A centralized liquid level control alarm system as set forth in claim 1, wherein: the manual control circuit comprises a change-over switch SA, a stop button SB1, a start button SB2, the input end of the change-over switch SA is connected with the H-phase output end of the fuse FU through a thermal relay FR1, the output end two of the change-over switch SA is connected with one end of a stop button SB1, the other end of the stop button SB2 is respectively connected with one end of a start button SB2 and the input end of a normally open auxiliary contact of an AC contactor KM2, the other end of the start button SB2 and the output end of the normally open auxiliary contact of the AC contactor KM2 are connected with one end of a coil of the AC contactor KM2, the other end of the coil of the AC contactor KM2 is respectively connected with one end of a coil of the AC contactor KM1 and an I-phase output end of the fuse FU, and the other end of the coil.
5. A centralized liquid level control alarm system as set forth in claim 1, wherein: the automatic control circuit comprises a triode V1, a triode V2, a triode V3, a relay K1, a relay K2 and a coil of a relay K3, wherein the output end of the power circuit is respectively connected with the collector of the triode V1, the collector of the triode V2, the collector of the triode V3, the normally-open contact of the relay K1 and the common end of the relay K2, the emitter of the triode V1 is respectively connected with the cathode of a diode D2 and one end of the coil of the relay K1, the anode of a diode D2 is grounded, the other end of the coil of the relay K1 is respectively connected with the ground and the normally-closed contact of the relay K1, the common end of the relay K1 is connected with a first input pin of a NAND gate N1, the output pin of a NAND gate N1 is respectively connected with one end of a resistor R4 and a second input pin of the NAND gate N3, the second input pin of the NAND gate N3 is connected with the output pin of the NAND gate N3, two input pins of the NAND gate N2 are connected with an emitter of a triode V2, an emitter of a triode V2 is grounded through a resistor R3, the other end of the resistor R4 is connected with a base of a triode V3, an emitter of a triode V3 is respectively connected with a cathode of a diode D4 and one end of a coil of a relay K2, an anode of a diode D4 and the other end of the coil of the relay K2 are grounded, a normally closed contact of the relay K2 is grounded through the coil of the relay K3, a base of a triode V1 is connected with a sensing electrode A, and a base of a triode V2 is connected with a sensing electrode B.
6. A centralized liquid level control alarm system as set forth in claim 1, wherein: the alarm circuit comprises a buzzer, a thermal relay FR2 and a normally open auxiliary contact of an alternating current contactor KM1, wherein one end of the buzzer is connected with the output end of the normally open auxiliary contact of the alternating current contactor KM1 and the output end of the thermal relay FR2 respectively, the other end of the buzzer is grounded, the input end of the normally open auxiliary contact of the alternating current contactor KM1 is connected with an emitting electrode of a triode V2, and the input end of the thermal relay FR2 is connected with an emitting electrode of a triode V3.
7. A centralized liquid level control alarm system as set forth in claim 1, wherein: the liquid level display device further comprises a display circuit for displaying the liquid level position, wherein the display circuit comprises a light emitting diode D1 and a light emitting diode D3, the light emitting diode D1 is connected between the emitter of the triode V1 and the diode D2 in a forward direction, and the light emitting diode D3 is connected between the emitter of the triode V2 and the resistor R3 in a forward direction.
8. A centralized liquid level control alarm system as set forth in claim 1, wherein: the power supply circuit comprises a transformer, the input end of the transformer is connected with a power supply, the output end of the transformer is connected with the input end of a bridge rectifier circuit, the positive electrode of the output end of the bridge rectifier circuit is respectively connected with one end of a filter capacitor C1 and the input end of a three-terminal voltage stabilizer, and the output end of the three-terminal voltage stabilizer is connected with the filter capacitor C0The negative electrode of the output end of the bridge rectifier circuit is respectively connected with the other end of the filter capacitor C1, the common end of the three-terminal regulator and the filter capacitor C0And the common end of the three-terminal regulator is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666993A (en) * | 2020-12-31 | 2021-04-16 | 深圳市品鼎科技有限公司 | Automatic oiling control system suitable for liquid |
| CN115805662A (en) * | 2022-11-22 | 2023-03-17 | 中铁十八局集团有限公司 | Automatic preparation system for mixed liquid for shield construction |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112666993A (en) * | 2020-12-31 | 2021-04-16 | 深圳市品鼎科技有限公司 | Automatic oiling control system suitable for liquid |
| CN115805662A (en) * | 2022-11-22 | 2023-03-17 | 中铁十八局集团有限公司 | Automatic preparation system for mixed liquid for shield construction |
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