CN203759554U - Automatic water supply control system - Google Patents
Automatic water supply control system Download PDFInfo
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- CN203759554U CN203759554U CN201420170089.1U CN201420170089U CN203759554U CN 203759554 U CN203759554 U CN 203759554U CN 201420170089 U CN201420170089 U CN 201420170089U CN 203759554 U CN203759554 U CN 203759554U
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- relay
- water
- branch road
- control circuit
- water pump
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 249
- 239000007788 liquid Substances 0.000 claims description 58
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 15
- 239000000523 sample Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000008400 supply water Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model provides an automatic water supply control system comprising at least two level relays and one automatic control circuit. Two ends of the automatic control circuit are connected to power ends of the level relays; the automatic control circuit comprises relay normally-open contacts, at least two middle relays, a pump starting relay, a pump stopping relay and an alternating-current contactor; each level relay normally-open contact is connected to a middle relay coil in series to form first and second branch circuits; middle relay normally-closed contacts are connected to a pump stopping relay coil in series to form a third branch circuit; middle relay normally-open contacts which are connected in parallel are connected to a pump starting relay coil in series to form a fourth branch circuit; pump starting relay normally-open contacts are connected to alternating-current contactor normally-open contacts in parallel and is connected to pump stopping relay normally-closed contacts and an alternating-current contactor coil in series to form a fifth branch circuit; the first, second, third, fourth and fifth branch circuits are connected in series. According to the automatic water supply control system, a main pump power supplying loop is controlled by controlling alternating-current contactor contacts to open and close, cost is low, and operation is simple.
Description
Technical field
The utility model relates to automatic control technology, relates in particular to a kind of water supply automatic control system.
Background technology
In water conservancy, agricultural, in the productions such as chemical industry, often can encounter separate unit water pump to multiple water tanks, or the situation of water tower water-feeding, conventionally utilize the control components and parts of more complicated to realize control, such as adopting ultrasonic level gage, auxiliary reclay (comprising a water pump unlatching relay and a water pump slew relay), A.C. contactor and Programmable Logic Controller (hereinafter to be referred as PLC), electric gate valve, by in PLC internal composition program, in the time that the water level in water tank changes, send signal to PLC by ultrasonic level gage, PLC opens by inner programmed control associated pipe electric gate valve, stop, opening electric gate valve simultaneously, stop putting in place signal return to PLC, water pump is opened relay or the action of water pump slew relay, and then control A.C. contactor main contacts conducting or disconnect water pump current supply circuit, but construction costs is too high, inapplicable again in temporary project, if the words of start-stop water pump manually, manipulation strength is too large, and need many people to assist, otherwise cannot grasp in time the variation of Water in Water Tanks position.
Utility model content
The utility model provides a kind of water supply automatic control system, for overcoming defect of the prior art, reduces production costs and simplifies manual operation.
A kind of water supply automatic control system of the utility model, this system comprises at least two liquid level relays and an automatic control circuit; The two ends of described automatic control circuit connect the power end of described liquid level relay;
Described automatic control circuit comprises the normally opened contact of described liquid level relay, at least two auxiliary reclays, water pump unlatching relay, a water pump slew relay and an A.C. contactor;
Described in each, the normally opened contact of liquid level relay is connected with the coil of auxiliary reclay described in each and is formed respectively the first branch road and the second branch road; The coil series connection of the normally closed contact of two described auxiliary reclays and water pump slew relay forms the 3rd branch road;
Described in two, after the normally opened contact parallel connection of auxiliary reclay, connect and form the 4th branch road with the coil of described water pump unlatching relay;
After the described water pump unlatching normally opened contact of relay and the normally opened contact parallel connection of described A.C. contactor, connect with the normally closed contact of described water pump slew relay and the coil of A.C. contactor and form the 5th branch road;
Above-mentioned the first branch road, the second branch road, the 3rd branch road, the 4th branch road and the 5th branch road be the main current supply circuit of described automatic control circuit for passing through to control the main contacts folding of described A.C. contactor and then controlling water pump that form in parallel all.
Wherein, this system also comprises the manual change-over switch of manual control circuit and for changing between described manual control circuit and described automatic control circuit;
Described manual control circuit comprises stop button and the start button of series connection;
The common port of described manual change-over switch is connected with one of them power end of described liquid level relay, a wherein end of convert of described manual change-over switch is connected with described automatic control circuit, and another end of convert of described manual change-over switch is connected with described manual switch circuit one end;
The described manual switch circuit other end is connected between water pump slew relay normally closed contact described in the 5th branch road and ac contactor coil;
Described A.C. contactor also comprises another normally opened contact, and another normally opened contact of described A.C. contactor is connected in parallel on described start button two ends.
Further, this system also comprises a fuse;
Described fuse is connected with described automatic control circuit, and described fuse is connected with described manual control circuit.
Particularly, this system also comprises an electrothermal relay;
Described electrothermal relay is connected between A.C. contactor main contacts and pump motor stator;
Ac contactor coil series connection described in the normally closed contact of described electrothermal relay.
The water supply automatic control system that the utility model provides, the power supply terminal of liquid level relay connects respectively power supply, in the time all there is no water in two water tanks, the coil of two liquid level relays all electric, the normally opened contact of two liquid level relays is all closed, the first branch road and the equal conducting of the second branch road, two auxiliary reclay coils all electric, the normally closed contact of two auxiliary reclays all disconnects, the 3rd branch road disconnects, water pump slew relay coil losing electricity, the normally closed contact closure of water pump slew relay, the normally opened contact of two auxiliary reclays is all closed, the 4th rood electricity, water pump is opened relay coil and is obtained electric, water pump is opened relay normally open contact closure, the 5th rood electricity, ac contactor coil obtains electric, control A.C. contactor main contacts closure, conducting water pump current supply circuit, pump working is to two cistern water supplies,
When in two water tanks, water level rises to default peak level, the coil losing electricity of two liquid level relays, liquid level relay normally opened contact all disconnects, and the 4th branch road disconnects, and water pump is opened relay electric-loss, and water pump is opened relay normally open contact and is disconnected; Two auxiliary reclay normally closed contacts are all closed, the 3rd branch road closure, and water pump slew relay obtains electric, water pump slew relay normally closed contact disconnects, and the 5th branch road disconnects, ac contactor coil dead electricity, A.C. contactor main contacts disconnects, and water pump current supply circuit disconnects, and water pump stops to two cistern water supplies; In the time having a water level not arrive default peak level in two water tanks, one of them liquid level relay coil obtains electric, there is a liquid level relay normally opened contact closure, the 4th branch road will keep conducting state, water pump is opened relay coil and is obtained electric, AC contactor main contact conducting water pump current supply circuit, water pump just continues to supply water in water tank, can close to the water supply line that reaches peak level water tank by ball-cock assembly automation;
Along with two water demands that water tank is different, there is at random a water tank to reach at first default lowest water level, the liquid level relay coil being arranged on this water tank obtains electric, the normally opened contact closure of this liquid level relay, a branch road conducting of connecting with this normally opened contact, suppose the first branch road conducting, the auxiliary reclay coil being connected in the first branch road obtains electric, in the 4th branch road, there is the normally opened contact closure of an auxiliary reclay, the 4th branch road conducting, water pump is opened relay coil and is obtained electric, and then obtain the electric A.C. contactor main contacts closure that makes by ac contactor coil, conducting water pump current supply circuit, water pump is to two cistern water supplies,
The control system that the control system that adopts liquid level relay, auxiliary reclay and A.C. contactor, ball-cock assembly to form forms with respect to available technology adopting ultrasonic level gage, auxiliary reclay, electric gate valve and PLC, greatly reduce production cost, and circuit is simple, reliable in action, can automatically controlled water pump to multiple cistern water supplies, greatly reduced manual operation.
Brief description of the drawings
The circuit diagram of the water supply automatic control system that Fig. 1 provides for the utility model embodiment;
The structural representation of each water tank inside in the automatic control system that Fig. 2 provides for the utility model embodiment;
The internal circuit diagram of the liquid level relay in the automatic control system that Fig. 3 provides for the utility model embodiment.
Embodiment
As Figure 1-3, a kind of water supply automatic control system of the utility model, this system comprises at least two liquid level relays (being specially the first liquid level relay X and the second liquid level relay Y) and an automatic control circuit; The two ends of automatic control circuit connect the power end of liquid level relay; The first liquid level relay X and the second liquid level relay Y share an AC power, and as shown in Figure 1, power supply terminal 1,8 all connects 220V AC power; Automatic control circuit comprises normally opened contact X2, X3, normally opened contact Y2, the Y3 of the second liquid level relay, at least two auxiliary reclays (being specially the first water tank high water stage relay and the second water tank high water stage relay), water pump unlatching relay, a water pump slew relay and an A.C. contactor of the first liquid level relay; Normally opened contact X2, the X3 of the first liquid level relay connects with the coil K1 of the first water tank high water stage relay and forms the first branch road, and normally opened contact Y2, the Y3 of the second liquid level relay connects with the coil K2 of the second water tank high water stage relay and form the second branch road; The normally closed contact K13 of the first water tank high water stage relay and the second normally closed contact K23 of water high water stage case relay and the coil K3 of water pump slew relay series connection form the 3rd branch road; After the normally opened contact K21 parallel connection of the normally opened contact K11 of the first water tank high water stage relay and the second water tank high water stage relay, connect and form the 4th branch road with the coil K4 of water pump unlatching relay; After the water pump unlatching normally opened contact K41 of relay and the normally opened contact KM1 parallel connection of A.C. contactor, connect with the normally closed contact K33 of water pump slew relay and the coil KM of A.C. contactor and form the 5th branch road; Above-mentioned the first branch road, the second branch road, the 3rd branch road, the 4th branch road and the 5th branch road be the main current supply circuit of automatic control circuit for passing through to control the main contacts folding of A.C. contactor and then controlling water pump that form in parallel all.
In the present embodiment, describe to two water tank automatic water-supplies as example taking separate unit water pump 30, each water tank needs a liquid level relay, water tank inlet that a ball-cock assembly 9 is installed, high water stage probe terminal X5, low-water level probe terminal X6 and the datum level probe terminal X7 of the first liquid level relay X all stretch in the first water tank 10, be used in the time that the water level of the first water tank 10 arrives the water level of each probe terminal setting, sending signal and make normally opened contact X2, the X3 action of the first liquid level relay X, and then trigger automatic control circuit, the high water stage probe terminal Y5 of same the second liquid level relay Y, low-water level probe terminal Y6 and datum level probe terminal Y7 all stretch in the second water tank 20, for example, for arrive water level (the high 3.0m of water tank that each probe terminal is set at the water level of the second water tank 20, the high 2.8m of gap 10a, the high 2.5m of water inlet 10b, the ball float cut-off position 10c high 2.3m of ball-cock assembly 8 in the time of closed pipeline, the high 0.3m of water delivering orifice 10d, setting high water stage 5a is 2.0m, low-water level 6a is 0.5m, datum level 7a is 0.3m) time send signal and make the normally opened contact Y2 of the second liquid level relay Y, Y3 action, and then triggering automatic control circuit, in order to protect ball-cock assembly 9 and water pump 30, ball float cut-off position 10c wants the high 200～300mm of high water stage 5a conventionally, when the first water tank water level inside is lower than low-water level 6a, and the second water tank water level inside is while arriving high water stage 5a, water pump is in running order, continue to two water tank water intakes, at this moment when the second water tank water level inside reaches ball float cut-off position 10c, can water inlet 10b be blocked by ball-cock assembly 9, water pump is only to the first water tank water intake, when in the first water tank, water level reaches high water stage 5a, water pump quits work, if ball float cut-off position 10c and high water stage 5a distance are too near, while also not arriving high water stage 5a, likely ball-cock assembly has just blocked water inlet pipe, water pump can continue water inlet, ball-cock assembly 9 is impaired serious like this, and, the intake pressure of water pump can increase greatly, water pump also easily damages.The position of water delivering orifice 10d is not conventionally higher than datum level 7a, and the water in water tank can flow out and use through water delivering orifice higher than the water of datum level part like this.
The water supply automatic control system that the utility model provides, the power supply terminal 1 of liquid level relay, 8 connect respectively AC power, when the first water tank 10, while all thering is no water in the second water tank 20, the coil KA of the first liquid level relay and the coil KA of the second liquid level relay all electric, the normally opened contact X2 of the first liquid level relay, X3, the normally opened contact Y2 of the second liquid level relay, Y3 is all closed, the first branch road and the equal conducting of the second branch road, two auxiliary reclay coils (i.e. the first water tank high water stage relay coil K1 and the second water tank high water stage relay coil K2) all electric, the normally closed contact (the first water tank high water stage relay normally closed contact K13 and the second water tank high water stage relay normally closed contact K23) of two auxiliary reclays all disconnects, the 3rd branch road disconnects, water pump slew relay coil K3 dead electricity, the normally closed contact K33 closure of water pump slew relay, the normally opened contact (the first water tank high water stage relay normally open contact K11 and the second water tank high water stage relay normally open contact K21) of two auxiliary reclays is all closed, the 4th rood electricity, water pump is opened relay coil K4 and is obtained electric, water pump is opened relay normally open contact K41 closure, the 5th rood electricity, ac contactor coil KM obtains electric, control A.C. contactor main contacts closure, conducting water pump current supply circuit, pump working is to two cistern water supplies,
When in two water tanks, water level rises to default peak level (2.0m), the coil KA dead electricity of two liquid level relays, the first liquid level relay normally opened contact X2, X3 and the second liquid level relay normally opened contact Y2, Y3 all disconnect, the first branch road, the second branch road all disconnect, the first water tank high water stage relay normally open contact K11 and the second water tank high water stage relay normally open contact K21 all disconnect, the 4th branch road disconnects, water pump is opened relay coil K4 dead electricity, and water pump is opened relay normally open contact K41 and disconnected; The first water tank high water stage relay normally closed contact K13 and the second water tank high water stage relay K 23 are all closed, the 3rd branch road closure, water pump slew relay coil K3 obtains electric, water pump slew relay normally closed switch K33 disconnects, the 5th branch road disconnects, ac contactor coil KM dead electricity, and A.C. contactor main contacts disconnects, water pump current supply circuit disconnects, and water pump stops to two cistern water supplies; In the time having a water level not arrive default peak level in two water tanks, one of them liquid level relay coil obtains electric, there is a liquid level relay normally opened contact closure, the 4th branch road will keep conducting state, water pump is opened relay coil K4 and is obtained electric, AC contactor main contact conducting water pump current supply circuit, water pump just continues to supply water in water tank, can close to the water supply line that reaches peak level water tank by ball-cock assembly 9 automations;
Along with two water demands that water tank is different, there is at random a water tank to reach at first default lowest water level, the liquid level relay coil being arranged on this water tank obtains electric, the normally opened contact closure of this liquid level relay, a branch road conducting of connecting with this normally opened contact, suppose the first branch road conducting, the auxiliary reclay coil being connected in the first branch road obtains electric, in the 4th branch road, there is the normally opened contact closure of an auxiliary reclay, the 4th branch road conducting, water pump is opened relay coil and is obtained electric, and then obtain the electric A.C. contactor main contacts closure that makes by ac contactor coil, conducting water pump current supply circuit, water pump is to two cistern water supplies,
If desired when separate unit water pump is to three water tank automatic water-supplies, need to increase the 3rd liquid level relay and three-tank high water stage relay, three-tank water inlet pipeline ball-cock assembly, branch road and first to five branch circuit parallel connection of the normally opened contact of the 3rd liquid level relay being connected with three-tank high water stage relay coil and forming; Again by normally closed contact series connection access the 3rd branch road of three-tank high water stage relay; Finally that the normally opened contact of three-tank high water stage relay is all in parallel with the first water tank high water stage relay normally open contact and the second water tank high water stage relay normally open contact in the 4th branch road; To four cistern water supplies by that analogy, repeat no more.
The control system that adopts the control system of liquid level relay, auxiliary reclay, ball-cock assembly and A.C. contactor formation to form with respect to available technology adopting ultrasonic level gage, auxiliary reclay and PLC, greatly reduce production cost, and circuit is simple, reliable in action, can automatically controlled water pump to multiple cistern water supplies, greatly reduced manual operation.
The components and parts such as the simple liquid level relay of electric control circuit utilization, auxiliary reclay and A.C. contactor in this kind of design, utilize the conducting principle of water, liquid level relay inside has transistor to amplify the On current of water, utilize saturation conduction and the cut-off state of triode, to drive liquid level relay coil to obtain electric dead electricity, and then trigger auxiliary contact and move, carry out logical combination judgement by auxiliary reclay, and then the A.C. contactor that triggers water pump current supply circuit moves, as long as have any one water tank at low-water level state, start water pump, supply water; Many water tanks are simultaneously in the time of high water stage, and Pump Failure, stops supplying water.The closure of pipeline is by the control of ball-cock assembly automation.Non-return valve 40 is installed in water inlet manifold road, is prevented the impact of water hammer effect to water pump.Liquid level relay can be selected JYB-714 type liquid level relay.
As the preferred implementation of above-mentioned water supply automatic control system, this system also comprises the manual change-over switch 11 of manual control circuit and for changing between manual control circuit and automatic control circuit; Manual control circuit comprises stop button 12 and the start button 13 of series connection; The common port 11a of manual change-over switch is connected to a wherein power end of liquid level relay, a wherein end of convert (being automatic catch 11b) of manual change-over switch is connected with automatic control circuit, and another end of convert (being manual gear 11c) of manual change-over switch is connected with manual switch circuit one end; The manual switch circuit other end is connected in the 5th branch road between water pump slew relay normally closed contact K33 and ac contactor coil KM; A.C. contactor also comprises another normally opened contact KM2, and another normally opened contact KM2 of A.C. contactor is connected in parallel on start button 13 two ends.
When the components and parts in above-mentioned automatic control circuit break down, when needing repairing or changing, manual change-over switch 11 can be pushed to manual gear 11c by automatic catch 11b, liquid level relay is subject to manual control circuit control, start button 13, hand automatic change over 11 and stop button 12 all can be arranged on panel box outside, convenient operation; Start button 13 and stop button 12 all do not have self-retaining function here, can be regarded as motor operated switch, click start button, manual control circuit conducting, ac contactor coil KM obtains electric, the A.C. contactor normally opened contact KM2 closure in parallel with start button, unclamp after start button 13, ac contactor coil KM self-sustaining with all the time in electricity condition, the conducting of water pump current supply circuit, starting mode of pump is to each cistern water supply; Click stop button 12, manual control circuit disconnects, ac contactor coil KM dead electricity, and A.C. contactor normally opened contact KM2 disconnects, and unclamps the rear manual control circuit of stop button 12 still in off-state, and water pump current supply circuit disconnects, and water pump stops supplying water.
For Protection control system, this system also comprises a fuse 14; Fuse 14 is connected with automatic control circuit, also connects with manual control circuit.In the time that in the major loop of control system, electric current exceedes the setting of fuse, fuse exceedes after setting a period of time according to electric current, and the heat producing with himself makes melt fusing, thereby control system major loop is disconnected, and plays the effect of Protection control system.
In order to protect pump motor, this system also comprises an electrothermal relay; Electrothermal relay KK is connected between pump motor stator and AC contactor main contact; The normally closed contact KK1 of electrothermal relay connects with described ac contactor coil KM.
In the time that in water pump current supply circuit, electric current and time exceed electrothermal relay regulation; produce heat by the electric current that flows into thermal element; make the bimetallic strip generation deformation of different expansion coefficient; in the time that deformation reaches certain distance; just promote connecting rod action, the 5th branch road in control system is disconnected, thereby make ac contactor coil KM dead electricity; thereby water pump current supply circuit is disconnected, realize the overload protection of motor.
Finally it should be noted that: above each embodiment, only in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the scope of the each embodiment technical scheme of the utility model.
Claims (4)
1. a water supply automatic control system, is characterized in that, this system comprises at least two liquid level relays and an automatic control circuit; The two ends of described automatic control circuit connect the power end of described liquid level relay;
Described automatic control circuit comprises the normally opened contact of described liquid level relay, at least two auxiliary reclays, water pump unlatching relay, a water pump slew relay and an A.C. contactor;
Described in each, the normally opened contact of liquid level relay is connected with the coil of auxiliary reclay described in each and is formed respectively the first branch road and the second branch road; The coil series connection of the normally closed contact of two described auxiliary reclays and water pump slew relay forms the 3rd branch road;
After the normally opened contact parallel connection of two described auxiliary reclays, connect and form the 4th branch road with the coil of described water pump unlatching relay;
After the described water pump unlatching normally opened contact of relay and the normally opened contact parallel connection of described A.C. contactor, connect with the normally closed contact of described water pump slew relay and the coil of A.C. contactor and form the 5th branch road;
Above-mentioned the first branch road, the second branch road, the 3rd branch road, the 4th branch road and the 5th branch road be the described automatic control circuit of formation in parallel all, for the main current supply circuit that passes through to control the main contacts folding of described A.C. contactor and then control water pump.
2. water supply automatic control system according to claim 1, is characterized in that:
This system also comprises the manual change-over switch of manual control circuit and for changing between described manual control circuit and described automatic control circuit;
Described manual control circuit comprises stop button and the start button of series connection;
One of them power end of the common port of described manual change-over switch and described liquid level relay, a wherein end of convert of described manual change-over switch is connected with described automatic control circuit, and another end of convert of described manual change-over switch is connected with described manual switch circuit one end;
The described manual switch circuit other end is connected between water pump slew relay normally closed contact described in the 5th branch road and ac contactor coil;
Described A.C. contactor also comprises another normally opened contact, and another normally opened contact of described A.C. contactor is connected in parallel on described start button two ends.
3. water supply automatic control system according to claim 2, is characterized in that:
This system also comprises a fuse;
Described fuse is connected with described automatic control circuit, and described fuse is connected with described manual control circuit.
4. according to the arbitrary described water supply automatic control system of claim 1-3, it is characterized in that:
This system also comprises an electrothermal relay;
Described electrothermal relay is connected between A.C. contactor main contacts and pump motor stator;
The normally closed contact of described electrothermal relay is connected with described ac contactor coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420170089.1U CN203759554U (en) | 2014-04-09 | 2014-04-09 | Automatic water supply control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420170089.1U CN203759554U (en) | 2014-04-09 | 2014-04-09 | Automatic water supply control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203759554U true CN203759554U (en) | 2014-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420170089.1U Expired - Lifetime CN203759554U (en) | 2014-04-09 | 2014-04-09 | Automatic water supply control system |
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| CN (1) | CN203759554U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103914087A (en) * | 2014-04-09 | 2014-07-09 | 淮南矿业(集团)有限责任公司 | Water supply automatic control system |
| CN108227599A (en) * | 2016-12-14 | 2018-06-29 | 上海连成（集团）有限公司 | Dredge pump water pump intelligent control system |
-
2014
- 2014-04-09 CN CN201420170089.1U patent/CN203759554U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103914087A (en) * | 2014-04-09 | 2014-07-09 | 淮南矿业(集团)有限责任公司 | Water supply automatic control system |
| CN108227599A (en) * | 2016-12-14 | 2018-06-29 | 上海连成（集团）有限公司 | Dredge pump water pump intelligent control system |
| CN108227599B (en) * | 2016-12-14 | 2024-05-14 | 上海连成（集团）有限公司 | Intelligent control system for sewage pump |
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