CN105511506A - Water level control device for water collecting well - Google Patents

Abstract

<b>The present invention relates to the technical field of water level control of water collection wells of small hydropower plants, and is a water level control device for water collection wells, which includes a submersible pump, a feedback control device and a water level monitoring tube that can be fixedly installed in the water collection well; the surrounding water level monitoring tube Water inlet holes are evenly distributed on the outside of the water inlet hole, and the inner end of the water inlet hole communicates with the inner cavity of the water level monitoring tube. The upper inner cavity, the middle inner cavity and the lower inner cavity of the water level monitoring tube are respectively fixed with a high water level electrode head, a middle water level The electrode head and the low water level electrode head, the motor of the submersible pump are electrically connected with the feedback control device through the water pump cable. The invention has a reasonable and compact structure and is easy to use. It monitors the water level in the water collection well in real time through the water level electrode head, and automatically controls the start and stop of the submersible pump through the feedback control device, which realizes the automatic operation of the submersible pump and reduces the damage of the submersible pump and the relay. It not only reduces the labor intensity of inspectors and the workload of inspection and maintenance, but also saves the cost of power generation. </b>

Description

Well water level control device

technical field

The invention relates to the technical field of water level control of a water collection well of a small hydropower plant, and relates to a water level control device for a water collection well.

Background technique

At present, the sewage output during the operation of the existing small-scale water-diversion hydropower plants, such as the cooling water and lubricating water used by the hydroelectric generator sets, and the excess sewage on the top cover, are generally discharged to the water collection well through the drainage pipe. When the water level of the water collection well is high, the sewage in the water collection well needs to be discharged through the submersible pump. If the water level of the water collection well is too high, not only will the ground in the factory building be slippery and the water will splash everywhere, which will make it difficult for the personnel on duty to inspect, and will cause Long-term soaking and oxidation of penstocks and cooling water pipes can easily cause surface corrosion of penstocks and pipes, thinning walls of penstocks and pipes, and greatly shortening their service life.

In the actual use of the existing water collection wells, due to the large amount of sediment during the flood period and the high sand content of the water collection wells, not only the mechanical parts are worn out, but also the water collection wells are silted up, resulting in the volume of the water collection wells becoming smaller and the water level rising The time is shortened, the lowest point of the water level relay is buried by sand, causing the failure of the water level relay, and the submersible pump is buried by sand, causing the submersible pump to fail to pump water or even damaged, resulting in serious water leakage in the turbine room during power generation. , the water turbine shuts down, and even causes the entire plant to be flooded in severe cases, affecting the normal operation of the equipment.

The existing water level control system of the water collection well is manually controlled, requiring special care by the operator, and at the same time increases the workload of manpower, inspection and maintenance. Frequent manual operation may easily cause the contacts of the AC contactor of the water pump to stick to death, or burn the contactor , and the submersible pump is started frequently, which is easy to cause damage to the submersible pump. When the secondary circuit fails, the plant transformer protection trips frequently, and the reliability deteriorates, which has a negative impact on the automatic operation of the power generation equipment. Faults, resulting in control parameter drift, not only large economic losses, more maintenance workload, and even cause flooding of the factory building, which brings danger to the normal operation of the generator.

Therefore, the water level control system of the water collection well used in the existing hydropower plant has the following deficiencies in the actual use process: manual control requires a special person on duty, the operation is time-consuming and laborious, and frequent operations are easy to damage the contactor and submersible pump, which affects the normal operation of the power generation equipment. Hidden danger.

Contents of the invention

The invention provides a water level control device for a water collection well, which overcomes the deficiencies of the prior art and can effectively solve the problems of the existing water level control system for a water collection well, which require special personnel to be on duty for manual control, time-consuming and labor-intensive operation, and frequent operation is easy to damage the contactor And submersible pumps, which affect the normal operation of power generation equipment and pose potential safety hazards.

The technical solution of the present invention is achieved through the following measures: a water level control device for a water collection well, including a submersible pump, a feedback control device and a water level monitoring tube that can be fixedly installed in the water collection well; The water inlet hole, the inner end of the water inlet hole communicates with the inner cavity of the water level monitoring tube, and the upper inner cavity, the middle inner cavity and the lower inner cavity of the water level monitoring tube are respectively fixed with a high water level electrode head, a middle water level electrode head and a low water level electrode head. The electrode head and the submersible pump are located below the lower end of the water level monitoring pipe. The water inlet of the submersible pump is located at the lower end of the submersible pump and can communicate with the inner cavity at the bottom of the sump well. The motor of the submersible pump is electrically connected to the feedback control device through the pump cable. The high water level electrode head, the middle water level electrode head and the low water level electrode head are respectively electrically connected to the feedback control device through the water level electrode cable and can control the submersible pump according to the water level. work automatically.

Below is the further optimization or/and improvement to above-mentioned technical scheme of the invention:

The upper end of the water level monitoring pipe can be provided with an upper plug with a threading hole, and the middle part of the water level electrode cable is installed in the threading hole; or/and, a filter screen can be fixed at the lower end of the water level monitoring pipe.

The above-mentioned submersible pump can be a sewage submersible pump, and the outlet of the sewage submersible pump is connected with the water inlet of the sewage pipe of the sump well, and a sewage pump motor is installed on the sewage submersible pump, and the sewage pump motor is electrically connected with the feedback control device through a feedback control circuit; The control device may include a control box, a three-pole main switch, a first fuse, a second fuse, a normally closed stop button, a changeover switch, a sewage level relay, a sewage pump contactor and a comprehensive protector for the first motor, a changeover switch, The normally closed stop button is installed on the control box, and the three-pole main switch, the first fuse, the second fuse, the sewage liquid level relay, the sewage pump contactor and the first motor comprehensive protector are installed in the control box; the transfer switch includes The handle, the first switch contact, the second switch contact and the third switch contact that can be switched between the automatic gear of the sewage pump or the manual gear of the sewage pump, the first switch contact and the second switch contact in the state of the automatic gear of the sewage pump Electrical connection, the first switch contact and the third switch contact are electrically connected under the manual gear state of the sewage pump; the sewage level relay includes the first terminal of the sewage relay, the second terminal of the sewage relay, the third terminal of the sewage relay, and the fourth terminal of the sewage relay. terminal, the fifth terminal of the blowdown relay, the sixth terminal of the blowdown relay, the seventh terminal of the blowdown relay, and the eighth terminal of the blowdown relay; the blowdown pump contactor includes the blowdown contactor coil and the blowdown motor which can be closed when the blowdown contactor coil is energized The three-pole contact, the first integrated motor protector includes a coil of the first integrated protector and a normally open contact of the first integrated protector that can be closed when the coil of the first integrated protector is energized.

The above-mentioned feedback control circuit may include the main control circuit of the sewage pump motor, the automatic control circuit of the sewage pump motor and the manual control circuit of the sewage pump motor; the main control circuit of the sewage pump motor includes the first pole of the power supply, the second pole of the power supply, the third pole of the power supply, and the three poles The main switch, the normally open three-pole contact of the sewage motor and the sewage pump motor, the first pole of the power supply is electrically connected to the first terminal of the sewage pump motor through the three-pole main switch, the normally open three-pole contact of the sewage motor, and the first pole of the power supply The two poles are electrically connected to the second terminal of the sewage pump motor through the three-pole main switch and the normally open three-pole contact of the sewage motor in turn, and the third pole of the power supply is connected to the second terminal of the sewage pump motor through the three-pole main switch and the normally open three-pole contact of the sewage motor. The third terminal of the sewage pump motor is electrically connected; the self-control circuit of the sewage pump motor includes the first pole of the power supply, the first fuse, the normally closed stop button, the first terminal of the sewage relay, the third terminal of the sewage relay, and the fourth terminal of the sewage relay , the fifth terminal of the sewage relay, the sixth terminal of the sewage relay, the seventh terminal of the sewage relay, the eighth terminal of the sewage relay, the first switch contact, the second switch contact, high water level electrode head, medium water level electrode head, low water level electrode Head, blowdown contactor coil, first comprehensive protector normally open contact, first comprehensive protector coil, second fuse and third pole of power supply, first pole of power supply, first fuse, normally closed stop button, blowdown The first terminals of the relay are electrically connected in series in sequence, the third terminal of the sewage relay is electrically connected to the first terminal of the sewage relay, the fourth terminal of the sewage relay is electrically connected to the second switch contact, the first switch contact, the first The coil of the comprehensive protector, the second fuse, and the third pole of the power supply are electrically connected in series in sequence, and the normally open contact of the first comprehensive protector is electrically connected in series with the coil of the sewage contactor. At both ends, the fifth terminal of the sewage relay is electrically connected to the high water level electrode head, the sixth terminal of the sewage relay is electrically connected to the middle water level electrode head, the seventh terminal of the sewage relay is electrically connected to the low water level electrode head, and the eighth terminal of the sewage relay is electrically connected to the low water level electrode head. , the second fuse, and the third pole of the power supply are electrically connected in series; the manual control circuit of the sewage pump motor includes the first pole of the power supply, the first fuse, the normally closed stop button, the first switch contact, and the third switch contact point, the coil of the first comprehensive protector, the normally open contact of the first comprehensive protector, the coil of the sewage contactor, the second fuse and the third pole of the power supply, the first pole of the power supply, the first fuse, the normally closed stop button, the second The three switch contacts are electrically connected in series in sequence, the first switch contact, the coil of the first comprehensive protector, the second fuse and the third pole of the power supply are electrically connected in series in sequence, and the first comprehensive protector is normally open. The point is electrically connected in series with the coil of the sewage contactor and then electrically connected in parallel to both ends of the coil of the first comprehensive protector.

The above-mentioned control box can be equipped with a total power indicator light and a sewage pump working indicator light, and the feedback control circuit also includes a power supply indicator circuit and a sewage pump indicator light circuit; the power supply indicator circuit includes the first pole of the power supply, the first fuse, and the normally closed stop button , the main power indicator light, the second fuse and the third pole of the power supply, the first pole of the power supply, the first fuse, the normally closed stop button, the main power indicator light, the second fuse, and the third pole of the power supply are electrically connected in series in sequence Together; the sewage pump contactor also includes the normally open contact of the sewage indicator light that can be closed due to the power on the sewage contactor coil, and the sewage pump indicator light circuit includes the first pole of the power supply, the first fuse, the normally closed stop button, and the sewage indicator light normally open Contact, sewage pump working indicator light, second fuse and third pole of power supply, first pole of power supply, first fuse, normally closed stop button, normally open contact of sewage indicator light, sewage pump working indicator light, second fuse The device and the third pole of the power supply are electrically connected in series in sequence.

The above-mentioned submersible pump can also include a backup submersible pump, the outlet of the backup submersible pump communicates with the water inlet of the sewage pipe of the sump well, the backup submersible pump is equipped with a backup pump motor, and the backup pump motor is electrically connected to the feedback control device through the feedback control circuit; The feedback control device also includes a backup liquid level relay, a backup pump contactor and a second motor comprehensive protector. The backup liquid level relay, backup pump contactor and the second motor comprehensive protector are installed in the control box; the handle of the transfer switch can also In the standby pump automatic gear or standby pump manual gear switch, the transfer switch also includes the fourth switch contact, the fifth switch contact and the sixth switch contact, the fourth switch contact and the fifth switch contact in the standby pump automatic gear state Point electrical connection, the fourth switch contact and the sixth switch contact are electrically connected under the manual gear state of the backup pump; the backup liquid level relay includes the first terminal of the backup relay, the second terminal of the backup relay, the third terminal of the backup relay, and the third terminal of the backup relay. Four terminals, the fifth terminal of the backup relay, the sixth terminal of the backup relay, the seventh terminal of the backup relay, and the eighth terminal of the backup relay; the backup pump contactor includes a backup contactor coil and a backup motor that can be closed due to the backup contactor coil being energized. The three-pole contact is opened, and the second integrated motor protector includes a coil of the second integrated protector and a normally open contact of the second integrated protector that can be closed due to the coil of the second integrated protector being energized.

The above-mentioned feedback control circuit may include a backup pump motor main control circuit, a backup pump motor self-control circuit and a backup pump motor manual control circuit; the backup pump motor main control circuit includes a first pole of a power supply, a second pole of a power supply, a third pole of a power supply, and a three-pole The main switch, the normally open three-pole contact of the spare motor and the spare water pump motor, the first pole of the power supply is electrically connected to the first terminal of the spare water pump motor through the three-pole main switch, the normally open three-pole contact of the spare motor in turn, and the first pole of the power supply The two poles are electrically connected to the second connection terminal of the spare water pump motor through the three-pole main switch and the normally open three-pole contact of the spare motor in turn, and the third pole of the power supply is connected to the second terminal of the spare water pump motor through the three-pole main switch and the normally open three-pole contact of the spare motor in turn. The third terminal of the spare water pump motor is electrically connected to each other; the self-control circuit of the spare pump motor includes the first pole of the power supply, the first fuse, the normally closed stop button, the first terminal of the spare relay, the third terminal of the spare relay, and the fourth terminal of the spare relay , the fifth terminal of the backup relay, the sixth terminal of the backup relay, the seventh terminal of the backup relay, the eighth terminal of the backup relay, the fourth switch contact, the fifth switch contact, high water level electrode head, medium water level electrode head, low water level electrode Head, spare contactor coil, second comprehensive protector normally open contact, second comprehensive protector coil, second fuse and the third pole of power supply, first pole of power supply, first fuse, normally closed stop button, spare The first terminals of the relays are electrically connected in series in sequence, the third terminal of the backup relay is electrically connected to the first terminal of the backup relay, the fourth terminal of the backup relay is electrically connected to the fifth switch contact, the fourth switch contact, the second The coil of the comprehensive protector, the second fuse, and the third pole of the power supply are electrically connected in series in sequence. Both ends, the fifth terminal of the backup relay is electrically connected to the high water level electrode head, the sixth terminal of the backup relay is electrically connected to the middle water level electrode head, the seventh terminal of the backup relay is electrically connected to the low water level electrode head, and the eighth terminal of the backup relay , the second fuse, and the third pole of the power supply are electrically connected in series; the standby pump motor manual control circuit includes the first pole of the power supply, the first fuse, the normally closed stop button, the fourth switch contact, and the sixth switch contact point, the coil of the second comprehensive protector, the normally open contact of the second comprehensive protector, the spare contactor coil, the second fuse and the third pole of the power supply, the first pole of the power supply, the first fuse, the normally closed stop button, the second The six switch contacts are electrically connected in series in sequence, the fourth switch contact, the coil of the second comprehensive protector, the second fuse and the third pole of the power supply are electrically connected in series in sequence, and the second comprehensive protector normally open contact The point is electrically connected in series with the spare contactor coil and then electrically connected in parallel to both ends of the second comprehensive protector coil.

The above-mentioned control box can be equipped with a standby pump working indicator light, and the feedback control circuit also includes a standby pump indicator light circuit; the standby pump contactor also includes a standby indicator light normally open contact that can be closed due to the standby contactor coil being energized, and the standby pump indicator light circuit Including the first pole of the power supply, the first fuse, the normally closed stop button, the normally open contact of the spare indicator light, the working indicator light of the spare pump, the second fuse and the third pole of the power supply, the first pole of the power supply, the first fuse, the normal The shutdown button, the normally open contact of the standby indicator light, the standby pump work indicator light, the second fuse, and the third pole of the power supply are electrically connected in series in sequence.

The invention has a reasonable and compact structure and is easy to use. It monitors the water level in the water collection well in real time through the water level electrode head, and automatically controls the start and stop of the submersible pump through the feedback control device, which realizes the automatic operation of the submersible pump and reduces the damage of the submersible pump and the relay. It not only significantly reduces the labor intensity of inspectors and the workload of inspection and maintenance, but also saves the cost of power generation.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the front view of the preferred embodiment of the present invention.

Accompanying drawing 2 is the enlarged structure diagram of the water level monitoring pipe in accompanying drawing 1.

Accompanying drawing 3 is the schematic diagram of the control circuit of the present invention.

The codes in the drawings are: 1 is the submersible pump, 2 is the water level monitoring pipe, 3 is the water inlet hole, 4 is the upper plug, 5 is the filter screen, 6 is the tail water drainage channel, 7 is the drainage pipe of the water collection well, 8 is the water pump cable, 9 is the water level electrode cable, 10 is the water diversion pressure steel pipe, 11 is the water turbine, 12 is the runner, 13 is the sewage pipe of the generator, 14 is the control box, 15 is the changeover switch, 16 is the sewage liquid level relay , 17 is the sewage pump contactor, 18 is the first motor comprehensive protector, 19 is the standby liquid level relay, 20 is the standby pump contactor, 21 is the second motor comprehensive protector, 22 is the water collection well, H1 is the high water level electrode The height of the head from the water inlet of the submersible pump, H2 is the height of the middle water level electrode head from the water inlet of the submersible pump, H3 is the height of the low water level electrode head from the water inlet of the submersible pump, T1 is the high water level electrode head, T2 is the middle water level electrode head , T3 is the low water level electrode head, PM1 is the sewage pump motor, L1 is the first pole of the power supply, L2 is the second pole of the power supply, L3 is the third pole of the power supply, Q is the three-pole main switch, FU1 is the first fuse, FU2 is the second fuse, SB1 is the normally closed stop button, K1 is the first switch contact, K2 is the second switch contact, K3 is the third switch contact, K4 is the fourth switch contact, K5 is the fifth switch Contacts, K6 is the sixth switch contact, KM10 is the sewage contactor coil, KM11 is the normally open three-pole contact of the sewage motor, KM12 is the normally open contact of the sewage indicator light, KM20 is the first comprehensive protector coil, KM21 is the second One comprehensive protector normally open contact, PM2 is the spare water pump motor, KM30 is the spare contactor coil, KM31 is the spare motor normally open three-pole contact, KM32 is the spare indicator light normally open contact, KM40 is the second comprehensive protector coil , KM41 is the normally open contact of the second comprehensive protector, M1 is the first terminal of the sewage relay, M2 is the second terminal of the sewage relay, M3 is the third terminal of the sewage relay, M4 is the fourth terminal of the sewage relay, and M5 is the second terminal of the sewage relay Five terminals, M6 is the sixth terminal of the sewage relay, M7 is the seventh terminal of the sewage relay, M8 is the eighth terminal of the sewage relay, LD1 is the main power indicator light, LD2 is the sewage pump working indicator light, LD3 is the standby pump working indicator light, N1 is the first terminal of the backup relay, N2 is the second terminal of the backup relay, N3 is the third terminal of the backup relay, N4 is the fourth terminal of the backup relay, N5 is the fifth terminal of the backup relay, N6 is the sixth terminal of the backup relay, and N7 is The seventh terminal of the backup relay, N8 is the eighth terminal of the backup relay.

detailed description

The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.

In the present invention, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout of Figure 1 of the specification, such as: the positional relationship of front, rear, top, bottom, left, right, etc. It is determined according to the layout direction of the drawings in the description.

Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

As shown in Figures 1 and 2, the water level control device for the water collection well includes a submersible pump 1, a feedback control device, and a water level monitoring pipe 2 that can be fixedly installed in the water collection well 22; Hole 3, the inner end of the water inlet hole 3 communicates with the inner cavity of the water level monitoring tube 2, and the upper inner cavity, the middle inner cavity and the lower inner cavity of the water level monitoring tube 2 are respectively fixed with a high water level electrode head T1 and a middle water level electrode Head T2 and low water level electrode head T3, the submersible pump 1 is located below the lower end of the water level monitoring pipe 2, the water inlet of the submersible pump 1 is located at the lower end of the submersible pump 1 and can communicate with the inner cavity at the bottom of the water collection well 22, and the water outlet of the submersible pump 1 is connected to There is a water collection well sewage pipe 7 that can communicate with the tail water drainage channel 6. The motor of the submersible pump 1 is electrically connected to the feedback control device through the pump cable 8. The high water level electrode head T1, the middle water level electrode head T2 and the low water level electrode head T3 are respectively The water level electrode cable 9 is electrically connected to the feedback control device and can control the automatic operation of the submersible pump 1 according to the water level. The water in the upstream reservoir is led to the water turbine 11 through the water diversion penstock 10 through the butterfly valve, and the runner 12 of the water turbine 11 is driven to rotate to drive the generator to generate electricity. The sewage in the water turbine room is discharged into the water collection well 22 through the generator sewage pipe 13. The submersible pump 1 extracts the sewage in the sump 22 and discharges it into the tail water drainage channel 6 through the sump drain pipe 7 . The present invention can monitor the water level in the water collection well 22 in real time through the high water level electrode head T1, the middle water level electrode head T2 and the low water level electrode head T3, and automatically control the start and stop of the submersible pump 1 through the feedback control device, so that it can realize the submersible pump 1 Due to the reduced number of starts of the submersible pump 1, the damage rate of the submersible pump 1 and the relay is greatly reduced, and the labor intensity of the inspectors is greatly reduced, the workload of inspection and maintenance is significantly reduced, and the cost of power generation is saved. , prolong the safe and stable operation time of hydroelectric power generation equipment, improve the utilization rate of power generation equipment, and increase the annual power generation.

According to actual needs, the above water level control device for the water collection well can be further optimized or/and improved:

As shown in accompanying drawings 1 and 2, the upper end of the water level monitoring pipe 2 is provided with an upper plug 4 with a threading hole, and the middle part of the water level electrode cable 9 is installed in the threading hole; or/and, the lower end of the water level monitoring pipe 2 is fixed With strainer 5. The upper plug 4 can block the upper end nozzle of the water level monitoring pipe 2 to prevent the upper sewage from falling from the upper end of the water level monitoring pipe 2 to interfere with the water level electrode head; use the filter screen 5 to cover the lower end nozzle of the water level monitoring pipe 2 to prevent sand , mud enters and blocks the water level monitoring pipe 2; in actual use, the water level monitoring pipe 2 is preferably a PVC pipe, the water pump cable 8 is preferably bound and fixed on the outside of the water level monitoring pipe 2, and the upper plug 4 is preferably a fireproof woolen cloth. It is best to make the height H1 of the high water level electrode head from the water inlet of the submersible pump be 7.5 meters, the height H2 of the middle water level electrode head from the water inlet of the submersible pump is 4.5 meters, and the height H3 of the low water level electrode head from the water inlet of the submersible pump is 1.5 meters. .

As shown in Figures 1, 2, and 3, the submersible pump 1 is a sewage submersible pump. The outlet of the sewage submersible pump is connected to the water inlet of the sewage pipe 7 of the water collection well. The sewage pump motor PM1 and the sewage pump motor are installed on the sewage submersible pump. PM1 is electrically connected to the feedback control device through the feedback control circuit; the feedback control device includes the control box 14, the three-pole main switch Q, the first fuse FU1, the second fuse FU2, the normally closed stop button SB1, the transfer switch 15, and the sewage liquid Position relay 16, sewage pump contactor 17 and first motor comprehensive protector 18, transfer switch 15, normally closed stop button SB1 are installed on the control box 14, three-pole main switch Q, first fuse FU1, second fuse FU2, sewage liquid level relay 16, sewage pump contactor 17 and first motor integrated protector 18 are installed in the control box 14; changeover switch 15 includes the handle that can switch between the automatic gear of the sewage pump or the manual gear of the sewage pump, the first switch The contact K1, the second switch contact K2 and the third switch contact K3, the first switch contact K1 and the second switch contact K2 are electrically connected in the state of automatic shift of the sewage pump, and the first switch contact is in the state of manual shift of the sewage pump Point K1 is electrically connected to the third switch contact K3; the sewage level relay 16 includes the first terminal M1 of the sewage relay, the second terminal M2 of the sewage relay, the third terminal M3 of the sewage relay, the fourth terminal M4 of the sewage relay, and the fifth terminal of the sewage relay. Terminal M5, the sixth terminal of the blowdown relay M6, the seventh terminal of the blowdown relay M7, the eighth terminal of the blowdown relay M8; the blowdown pump contactor 17 includes the blowdown contactor coil KM10 and the blowdown motor that can be closed when the blowdown contactor coil KM10 is energized Open the three-pole contact KM11, the first integrated motor protector 18 includes the first integrated protector coil KM20 and the first integrated protector normally open contact KM21 which can be closed due to the first integrated protector coil KM20 being energized. The main control of the power supply can be realized through the three-pole main switch Q. The three-pole main switch Q is preferably a leakage air switch. When the aging of the contactor contacts causes a phase failure, the leakage air switch can jump off the motor to protect the submersible pump 1; The normally closed stop button SB1 can stop quickly in an emergency, which is safer and more convenient; the circuit can be protected by the first fuse FU1 and the second fuse FU2 to prevent the motor of the submersible pump 1 from burning out due to circuit failure. When the control circuit When a short-circuit fault occurs, for example, the first motor integrated protector 18 burns out, the sewage liquid level relay 16 burns out, the coil of the sewage pump contactor 17 burns out, etc., the first fuse FU1 and the second fuse FU2 will be blown immediately The circuit is disconnected to protect the control circuit; when the aging of the contactor contact causes a phase failure, the first integrated motor protector 18 can disconnect the feedback control circuit, protect the sewage pump motor PM1, and cut off the power of the sewage pump motor PM1 to make it It will not burn out. When the sewage pump motor PM1 has a short-circuit fault during operation, the first integrated motor protector 18 can quickly disconnect the circuit to protect the sewage pump motor PM1.

As shown in attached drawings 1, 2 and 3, the feedback control circuit includes the main control circuit of the sewage pump motor, the automatic control circuit of the sewage pump motor and the manual control circuit of the sewage pump motor; the main control circuit of the sewage pump motor includes the first pole L1 of the power supply, the second pole of the power supply Two-pole L2, third pole L3 of power supply, three-pole main switch Q, sewage motor normally open three-pole contact KM11 and sewage pump motor PM1, power supply first pole L1 successively pass through three-pole main switch Q, sewage motor normally open three-pole The contact KM11 is electrically connected to the first terminal of the sewage pump motor PM1, and the second pole L2 of the power supply is connected to the second terminal of the sewage pump motor PM1 through the three-pole main switch Q and the normally open three-pole contact KM11 of the sewage motor. Electrically connected, the third pole L3 of the power supply is electrically connected to the third terminal of the sewage pump motor PM1 through the three-pole main switch Q, the normally open three-pole contact KM11 of the sewage motor in turn; the self-control circuit of the sewage pump motor includes the first pole L1 of the power supply , the first fuse FU1, the normally closed stop button SB1, the first terminal of the sewage relay M1, the third terminal of the sewage relay M3, the fourth terminal of the sewage relay M4, the fifth terminal of the sewage relay M5, the sixth terminal of the sewage relay M6, the sewage relay The seventh terminal M7, the eighth terminal M8 of the sewage relay, the first switch contact K1, the second switch contact K2, the high water level electrode head T1, the middle water level electrode head T2, the low water level electrode head T3, the sewage contactor coil KM10, The first comprehensive protector normally open contact KM21, the first comprehensive protector coil KM20, the second fuse FU2 and the third pole L3 of the power supply, the first pole L1 of the power supply, the first fuse FU1, the normally closed stop button SB1, sewage discharge The first terminal M1 of the relay is electrically connected in series, the third terminal M3 of the sewage relay is electrically connected to the first terminal M1 of the sewage relay, the fourth terminal M4 of the sewage relay is electrically connected to the second switch contact K2, and the first switch The contact K1, the coil KM20 of the first comprehensive protector, the second fuse FU2, and the third pole L3 of the power supply are electrically connected in series together, and the normally open contact KM21 of the first comprehensive protector is electrically connected in series with the sewage contactor coil KM10 Afterwards, it is electrically connected in parallel at both ends of the coil KM20 of the first comprehensive protector, the fifth terminal M5 of the sewage relay is electrically connected with the high water level electrode head T1, the sixth terminal M6 of the sewage relay is electrically connected with the middle water level electrode head T2, and the sewage relay is electrically connected with the first water level electrode head T2. The seven terminals M7 are electrically connected to the low water level electrode head T3, the eighth terminal M8 of the sewage relay, the second fuse FU2, and the third pole L3 of the power supply are electrically connected in series; the manual control circuit of the sewage pump motor includes the first pole of the power supply L1, the first fuse FU1, the normally closed stop button SB1, the first switch contact K1, the third switch contact K3, the first comprehensive protector coil KM20, the first comprehensive protector normally open contact KM21, the sewage contactor The coil KM10, the second fuse FU2 and the third pole L3 of the power supply, the first pole L1 of the power supply, the first fuse FU1, the normally closed stop button SB1, and the third switch contact K3 are electrically connected in series in sequence, and the first switch The contact K1, the coil KM20 of the first comprehensive protector, the second fuse FU2 and the third pole L3 of the power supply are in accordance with The sequences are electrically connected in series, and the normally open contact KM21 of the first comprehensive protector is electrically connected in series with the coil KM10 of the sewage contactor, and then electrically connected in parallel at both ends of the coil KM20 of the first comprehensive protector. The sewage pump motor self-control circuit can detect the water level in the water collection well 22 through the water level electrode head, and realize the automatic operation of the sewage pump motor PM1. When the water level in the water collection well 22 rises to the high water level electrode head T1 position, the high water level electrode head T1 and The circuit between the middle water level electrode heads T2 is conducted due to the water in the water collection well 22, the main control circuit of the sewage pump motor is connected, the sewage pump motor PM1 is automatically started, and the sewage in the water collection well 22 is discharged through the sewage collection well 7. To the tail water drainage channel 6, the middle water level electrode head T2 and the low water level electrode head T3 play a self-maintaining role. When the circuit between the electrode heads T3 is disconnected due to lack of water and loses its self-holding function, the sewage pump motor PM1 automatically stops; the manual operation of the sewage pump motor PM1 can be realized through the manual control circuit of the sewage pump motor, which is more convenient and reliable to use.

As shown in accompanying drawings 1, 2 and 3, the control box 14 is equipped with a total power indicator light LD1 and a sewage pump working indicator light LD2, and the feedback control circuit also includes a power supply indicating circuit and a sewage pump indicating light circuit; One pole L1, first fuse FU1, normally closed shutdown button SB1, main power indicator LD1, second fuse FU2 and third pole L3 of power supply, first pole L1 of power supply, first fuse FU1, normally closed shutdown button SB1, the main power indicator light LD1, the second fuse FU2, and the third pole L3 of the power supply are electrically connected in series; the sewage pump contactor 17 also includes a sewage discharge indicator light normally open contact that can be closed due to the power-on of the sewage contactor coil KM10 Point KM12, the sewage pump indicator light circuit includes the first pole L1 of the power supply, the first fuse FU1, the normally closed stop button SB1, the normally open contact KM12 of the sewage indicator light, the sewage pump working indicator LD2, the second fuse FU2 and the third power supply Pole L3, the first pole L1 of the power supply, the first fuse FU1, the normally closed stop button SB1, the normally open contact KM12 of the sewage indicator light, the sewage pump working indicator LD2, the second fuse FU2, and the third pole L3 of the power supply string together. Through the power indicating circuit, the main power indicator LD1 can be energized and glow when the power is turned on, reminding the inspectors that the external power supply is normal and the three-pole main switch Q is in the open state; through the sewage pump indicator circuit, when the sewage pump motor PM1 is working, the sewage pump The working indicator light LD2 is energized and glows to remind inspectors that the sewage pump motor PM1 is in working condition, which is safer and more reliable. According to actual needs, the indicator light LD1 of the total power supply can be made green, and the working indicator light LD2 of the sewage pump can be turned red.

As shown in accompanying drawings 1, 2, and 3, the submersible pump 1 also includes a backup submersible pump, the outlet of the backup submersible pump communicates with the water inlet of the drainage pipe 7 of the sump well, and the backup water pump motor PM2 is installed on the backup submersible pump. The motor PM2 is electrically connected to the feedback control device through the feedback control circuit; the feedback control device also includes a backup liquid level relay 19, a backup pump contactor 20 and a second motor comprehensive protector 21, a backup liquid level relay 19, a backup pump contactor 20 and The second motor integrated protector 21 is installed in the control box 14; the handle of the changeover switch 15 can also switch between the automatic gear of the standby pump or the manual gear of the standby pump, and the changeover switch 15 also includes the fourth switch contact K4, the fifth switch contact K5 and the sixth switch contact K6, the fourth switch contact K4 and the fifth switch contact K5 are electrically connected in the state of the automatic shift of the standby pump, and the fourth switch contact K4 and the sixth switch contact K6 of the standby pump in the manual shift state Electrical connection; the reserve liquid level relay 19 includes a reserve relay first terminal N1, a reserve relay second terminal N2, a reserve relay third terminal N3, a reserve relay fourth terminal N4, a reserve relay fifth terminal N5, a reserve relay sixth terminal N6 , the seventh terminal N7 of the backup relay, the eighth terminal N8 of the backup relay; the backup pump contactor 20 includes a backup contactor coil KM30 and a backup motor normally open three-pole contact KM31 that can be closed due to the backup contactor coil KM30 being energized, the second The motor comprehensive protector 21 includes a second comprehensive protector coil KM40 and a second comprehensive protector normally open contact KM41 which can be closed due to the second comprehensive protector coil KM40 being energized. By arranging a spare submersible pump, the maintenance of the sewage submersible pump can be facilitated, and the drainage of the water collection well 22 will not be affected during the maintenance of related equipment, thereby ensuring the normal power generation of the water turbine 11 . When the aging of the contactor contacts causes a phase loss fault, the second integrated motor protector 21 can disconnect the feedback control circuit, protect the spare water pump motor PM2, and cut off the power of the spare water pump motor PM2 so that it will not burn out. When the spare water pump motor PM2 When a short-circuit fault occurs during operation, the second integrated motor protector 21 can quickly disconnect the circuit so as to protect the standby water pump motor PM2.

As shown in Figures 1, 2, and 3, the feedback control circuit includes the backup pump motor main control circuit, the backup pump motor self-control circuit and the backup pump motor manual control circuit; the backup pump motor main control circuit includes the first pole L1 of the power supply, the second pole of the power supply The two poles L2, the third pole L3 of the power supply, the three-pole main switch Q, the normally open three-pole contact KM31 of the spare motor and the spare water pump motor PM2, the first pole L1 of the power supply pass through the three-pole main switch Q, the normally open three-pole of the spare motor in turn The contact KM31 is electrically connected to the first terminal of the spare water pump motor PM2, and the second pole L2 of the power supply is connected to the second terminal of the spare water pump motor PM2 through the three-pole main switch Q, and the normally open three-pole contact KM31 of the spare motor. Electrically connected, the third pole L3 of the power supply is electrically connected to the third terminal of the spare pump motor PM2 through the three-pole main switch Q and the normally open three-pole contact KM31 of the spare motor in turn; the self-control circuit of the spare pump motor includes the first pole L1 of the power supply , the first fuse FU1, the normally closed stop button SB1, the first terminal of the backup relay N1, the third terminal of the backup relay N3, the fourth terminal of the backup relay N4, the fifth terminal of the backup relay N5, the sixth terminal of the backup relay N6, the backup relay The seventh terminal N7, the eighth terminal N8 of the backup relay, the fourth switch contact K4, the fifth switch contact K5, the high water level electrode head T1, the middle water level electrode head T2, the low water level electrode head T3, the spare contactor coil KM30, The second comprehensive protector normally open contact KM41, the second comprehensive protector coil KM40, the second fuse FU2 and the third pole L3 of the power supply, the first pole L1 of the power supply, the first fuse FU1, the normally closed stop button SB1, and the spare The first terminal N1 of the relay is electrically connected together in series, the third terminal N3 of the backup relay is electrically connected to the first terminal N1 of the backup relay, the fourth terminal N4 of the backup relay is electrically connected to the fifth switch contact K5, and the fourth switch The contact K4, the coil KM40 of the second comprehensive protector, the second fuse FU2, and the third pole L3 of the power supply are electrically connected in series together, and the normally open contact KM41 of the second comprehensive protector is electrically connected in series with the spare contactor coil KM30 Afterwards, it is electrically connected in parallel to the two ends of the coil KM40 of the second comprehensive protector, the fifth terminal N5 of the backup relay is electrically connected to the high water level electrode head T1, the sixth terminal N6 of the backup relay is electrically connected to the middle water level electrode head T2, and the backup relay No. The seven terminals N7 are electrically connected to the low water level electrode head T3, the eighth terminal N8 of the backup relay, the second fuse FU2, and the third pole L3 of the power supply are electrically connected in series; the manual control circuit of the spare pump motor includes the first pole of the power supply L1, the first fuse FU1, the normally closed stop button SB1, the fourth switch contact K4, the sixth switch contact K6, the second comprehensive protector coil KM40, the second comprehensive protector normally open contact KM41, the spare contactor The coil KM30, the second fuse FU2, the third pole L3 of the power supply, the first pole L1 of the power supply, the first fuse FU1, the normally closed stop button SB1, and the sixth switch contact K6 are electrically connected in series in sequence, and the fourth switch The contact K4, the coil KM40 of the second comprehensive protector, the second fuse FU2 and the third pole L3 of the power supply are in accordance with The sequence electricity is connected together in series, and the normally open contact KM41 of the second comprehensive protector is electrically connected in series with the spare contactor coil KM30, and then electrically connected in parallel at both ends of the coil KM40 of the second comprehensive protector. The automatic control circuit of the standby pump motor can detect the water level in the water collecting well 22 through the water level electrode head, and realize the automatic operation of the standby water pump motor PM2. When the water level in the water collecting well 22 rises to the position of the high water level electrode head T1, the high water level electrode head T1 and The circuit between the middle water level electrode heads T2 is conducted due to the water in the water collection well 22, the main control circuit of the backup pump motor is connected, the backup water pump motor PM2 is automatically started, and the sewage in the water collection well 22 is discharged through the drainage pipe 7 of the water collection well To the tail water drainage channel 6, the middle water level electrode head T2 and the low water level electrode head T3 play a self-maintaining role. When the circuit between the electrode heads T3 is disconnected due to lack of water and loses its self-holding function, the standby water pump motor PM2 automatically stops; the manual operation of the standby water pump motor PM2 can be realized through the manual control circuit of the standby pump motor, which is more convenient and reliable to use.

As shown in accompanying drawing 1,2,3, the standby pump working indicator light LD3 is installed on the control box 14, and the feedback control circuit also includes the standby pump indicator light circuit; The normally open contact KM32 of the closed standby indicator light, the standby pump indicator light circuit includes the first pole L1 of the power supply, the first fuse FU1, the normally closed stop button SB1, the normally open contact KM32 of the standby indicator light, the standby pump working indicator LD3, the second Fuse FU2 and the third pole L3 of the power supply, the first pole L1 of the power supply, the first fuse FU1, the normally closed stop button SB1, the normally open contact KM32 of the spare indicator lamp, the standby pump working indicator LD3, the second fuse FU2, the power supply The third poles L3 are sequentially electrically connected in series. Through the standby pump indicator light circuit, when the standby water pump motor PM2 is working, the standby pump working indicator LD3 is energized and glows, reminding the inspectors that the standby water pump motor PM2 is in a working state, which is safer and more reliable. According to actual needs, the standby pump working indicator LD3 can be turned into a yellow light for easy distinction.

The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and non-essential technical features can be increased or decreased according to actual needs to meet the needs of different situations.

Claims (8)

1. a sump water-level control apparatus, is characterized in that the water level monitoring pipe comprising submersible pump, feed back control system and can be fixedly mounted in sump, outside around water level monitoring pipe is evenly equipped with inlet opening, the inner of inlet opening communicates with water level monitoring tube cavity, in the top inner chamber of water level monitoring pipe, high water level electrode head is fixed with respectively in the inner chamber of middle part with in lower lumen, middle water level electrode tip and low water level electrode head, submersible pump is positioned at the below of water level monitoring pipe lower end, the water inlet of submersible pump is positioned at submersible pump lower end and can communicates with inner chamber bottom sump, the water delivering orifice of submersible pump is connected with the sump blow-off pipe that can communicate with tail water catch gutter, the motor of submersible pump is electrically connected with feed back control system by water pump cable, high water level electrode head, middle water level electrode tip and low water level electrode head to be electrically connected with feed back control system respectively by level electrode cable and can to control submersible pump automatic operation according to water level height.

2. sump water-level control apparatus according to claim 1, it is characterized in that the upper end of water level monitoring pipe is provided with the upper shutoff of band through wires hole, the middle part of level electrode cable is arranged in through wires hole; Or/and the lower end of water level monitoring pipe is fixed with filter screen.

3. sump water-level control apparatus according to claim 1 and 2, it is characterized in that submersible pump is blowdown submerged pump, the water delivering orifice of blowdown submerged pump communicates with the water inlet of sump blow-off pipe, blowdown submerged pump is provided with drain pump motors, and drain pump motors is electrically connected with feed back control system by feedback control circuit; Feed back control system comprises control box, three pole master switchs, the first fuse, the second fuse, normally closed stop botton, switch, blowdown liquid level relay, dredge pump contactor and the first comprehensive protector of motor, switch, normally closed stop botton are arranged on control box, and three pole master switchs, the first fuse, the second fuse, blowdown liquid level relay, dredge pump contactor and the first comprehensive protector of motor are arranged in control box; Switch comprises can at the handle of dredge pump automatic transmission or the manual switching of dredge pump, the first switch contact, second switch contact and the 3rd switch contact, first switch contact and the electrical connection of second switch contact under dredge pump automatic transmission state, the first switch contact and the electrical connection of the 3rd switch contact under the manual state of dredge pump; Blowdown liquid level relay comprises blowdown relay the first terminal, blowdown relay second terminal, blowdown relay the 3rd terminal, blowdown relay the 4th terminal, blowdown relay Five-terminals, blowdown relay the 6th terminal, blowdown relay the 7th terminal, blowdown relay the 8th terminal; Dredge pump contactor comprises blowdown contactor coil and can three contacts, pole often opened by the blowdown motor that close because the energising of blowdown contactor coil, and the first comprehensive protector of motor comprises first and combines and protect device coil and can combine and protect device coil electricity and closed first combines guarantor's device normally opened contact because of first.

4. sump water-level control apparatus according to claim 3, is characterized in that feedback control circuit comprises dredge pump motor governor circuit, dredge pump motor automatic control circuit and dredge pump motor manual circuit, dredge pump motor governor circuit comprises power supply first pole, power supply second pole, power supply the 3rd pole, three pole master switchs, three contact, pole and drain pump motors often opened by blowdown motor, power supply first pole is successively by three pole master switchs, the first connection terminal that blowdown motor often opens three contacts, pole and drain pump motors is electrically connected, power supply second pole is successively by three pole master switchs, the second connection terminal that blowdown motor often opens three contacts, pole and drain pump motors is electrically connected, power supply the 3rd pole is successively by three pole master switchs, the 3rd connection terminal that blowdown motor often opens three contacts, pole and drain pump motors is electrically connected, dredge pump motor automatic control circuit comprises power supply first pole, first fuse, normally closed stop botton, blowdown relay the first terminal, blowdown relay the 3rd terminal, blowdown relay the 4th terminal, blowdown relay Five-terminals, blowdown relay the 6th terminal, blowdown relay the 7th terminal, blowdown relay the 8th terminal, first switch contact, second switch contact, high water level electrode head, middle water level electrode tip, low water level electrode head, blowdown contactor coil, first combines guarantor's device normally opened contact, first combines guarantor's device coil, second fuse and power supply the 3rd pole, power supply first pole, first fuse, normally closed stop botton, blowdown relay the first terminal sequentially electricity is serially connected, and blowdown relay the 3rd terminal and blowdown relay the first terminal are electrically connected, and blowdown relay the 4th terminal and second switch contact are electrically connected, the first switch contact, first combines guarantor's device coil, second fuse, power supply the 3rd pole sequentially electricity is serially connected, first combines electricity after guarantor's device normally opened contact is connected in series with blowdown contactor coil electricity is connected in parallel on the first comprehensive two ends protecting device coil, blowdown relay Five-terminals and high water level electrode head are electrically connected, blowdown relay the 6th terminal and middle water level electrode tip are electrically connected, blowdown relay the 7th terminal and low water level electrode head are electrically connected, blowdown relay the 8th terminal, second fuse, power supply the 3rd pole sequentially electricity is serially connected, dredge pump motor manual circuit comprises power supply first pole, first fuse, normally closed stop botton, first switch contact, 3rd switch contact, first combines guarantor's device coil, first combines guarantor's device normally opened contact, blowdown contactor coil, second fuse and power supply the 3rd pole, power supply first pole, first fuse, normally closed stop botton, 3rd switch contact sequentially electricity is serially connected, first switch contact, first combines guarantor's device coil, second fuse and power supply the 3rd pole sequentially electricity are serially connected, first combines electricity after guarantor's device normally opened contact is connected in series with blowdown contactor coil electricity is connected in parallel on the first comprehensive two ends protecting device coil.

5. sump water-level control apparatus according to claim 4, it is characterized in that control box being provided with total power light and dredge pump relay indicating light, feedback control circuit also comprises power indicating circuit and dredge pump indication lamp circuit; Power indicating circuit comprises power supply first pole, the first fuse, normally closed stop botton, total power light, the second fuse and power supply the 3rd pole, and power supply first pole, the first fuse, normally closed stop botton, total power light, the second fuse, power supply the 3rd pole sequentially electricity are serially connected; Dredge pump contactor also comprises the blowdown that can close because of the energising of blowdown contactor coil and shows lamp normally opened contact; dredge pump indication lamp circuit comprises power supply first pole, lamp normally opened contact, dredge pump relay indicating light, the second fuse and power supply the 3rd pole is shown in the first fuse, normally closed stop botton, blowdown, power supply first pole, the first fuse, normally closed stop botton, blowdown show lamp normally opened contact, dredge pump relay indicating light, the second fuse, power supply the 3rd pole sequentially electricity be serially connected.

6. the sump water-level control apparatus according to claim 3 or 4 or 5, it is characterized in that submersible pump also comprises submersible pump for subsequent use, the water delivering orifice of submersible pump for subsequent use communicates with the water inlet of sump blow-off pipe, submersible pump for subsequent use is provided with reserve pump motor, reserve pump motor is electrically connected with feed back control system by feedback control circuit; Feed back control system also comprises liquid level relay for subsequent use, stand-by pump contactor and the second comprehensive protector of motor, and liquid level relay for subsequent use, stand-by pump contactor and the second comprehensive protector of motor are arranged in control box; The handle of switch can also in stand-by pump automatic transmission or the manual switching of stand-by pump, switch also comprises the 4th switch contact, the 5th switch contact and the 6th switch contact, 4th switch contact and the electrical connection of the 5th switch contact under stand-by pump automatic transmission state, the 4th switch contact and the electrical connection of the 6th switch contact under the manual state of stand-by pump; Liquid level relay for subsequent use comprises duplicate relay the first terminal, duplicate relay second terminal, duplicate relay the 3rd terminal, duplicate relay the 4th terminal, duplicate relay Five-terminals, duplicate relay the 6th terminal, duplicate relay the 7th terminal, duplicate relay the 8th terminal; Stand-by pump contactor comprises contactor coil for subsequent use and three contacts, pole often opened by the motor for subsequent use that can close because contactor coil for subsequent use energising, and the second comprehensive protector of motor comprises second and combines and protect device coil and can combine and protect device coil electricity and closed second combines guarantor's device normally opened contact because of second.

7. sump water-level control apparatus according to claim 6, is characterized in that feedback control circuit comprises stand-by pump motor governor circuit, stand-by pump motor automatic control circuit and stand-by pump motor manual circuit, stand-by pump motor governor circuit comprises power supply first pole, power supply second pole, power supply the 3rd pole, three pole master switchs, motor for subsequent use often drives three contacts, pole and reserve pump motor, power supply first pole is successively by three pole master switchs, the first connection terminal that motor for subsequent use often drives three contacts, pole and reserve pump motor is electrically connected, power supply second pole is successively by three pole master switchs, the second connection terminal that motor for subsequent use often drives three contacts, pole and reserve pump motor is electrically connected, power supply the 3rd pole is successively by three pole master switchs, the 3rd connection terminal that motor for subsequent use often drives three contacts, pole and reserve pump motor is electrically connected, stand-by pump motor automatic control circuit comprises power supply first pole, first fuse, normally closed stop botton, duplicate relay the first terminal, duplicate relay the 3rd terminal, duplicate relay the 4th terminal, duplicate relay Five-terminals, duplicate relay the 6th terminal, duplicate relay the 7th terminal, duplicate relay the 8th terminal, 4th switch contact, 5th switch contact, high water level electrode head, middle water level electrode tip, low water level electrode head, contactor coil for subsequent use, second combines guarantor's device normally opened contact, second combines guarantor's device coil, second fuse and power supply the 3rd pole, power supply first pole, first fuse, normally closed stop botton, duplicate relay the first terminal sequentially electricity is serially connected, and duplicate relay the 3rd terminal and duplicate relay the first terminal are electrically connected, and duplicate relay the 4th terminal and the 5th switch contact are electrically connected, the 4th switch contact, second combines guarantor's device coil, second fuse, power supply the 3rd pole sequentially electricity is serially connected, second combines electricity after guarantor's device normally opened contact is connected in series with contactor coil electricity for subsequent use is connected in parallel on the second comprehensive two ends protecting device coil, duplicate relay Five-terminals and high water level electrode head are electrically connected, duplicate relay the 6th terminal and middle water level electrode tip are electrically connected, duplicate relay the 7th terminal and low water level electrode head are electrically connected, duplicate relay the 8th terminal, second fuse, power supply the 3rd pole sequentially electricity is serially connected, stand-by pump motor manual circuit comprises power supply first pole, first fuse, normally closed stop botton, 4th switch contact, 6th switch contact, second combines guarantor's device coil, second combines guarantor's device normally opened contact, contactor coil for subsequent use, second fuse and power supply the 3rd pole, power supply first pole, first fuse, normally closed stop botton, 6th switch contact sequentially electricity is serially connected, 4th switch contact, second combines guarantor's device coil, second fuse and power supply the 3rd pole sequentially electricity are serially connected, second combines electricity after guarantor's device normally opened contact is connected in series with contactor coil electricity for subsequent use is connected in parallel on the second comprehensive two ends protecting device coil.

8. sump water-level control apparatus according to claim 7, it is characterized in that control box being provided with stand-by pump relay indicating light, feedback control circuit also comprises stand-by pump indication lamp circuit; Stand-by pump contactor also comprises the lamp normally opened contact that shows for subsequent use that can close because of contactor coil energising for subsequent use; stand-by pump indication lamp circuit comprises power supply first pole, the first fuse, normally closed stop botton, for subsequent usely shows lamp normally opened contact, stand-by pump relay indicating light, the second fuse and power supply the 3rd pole, power supply first pole, the first fuse, normally closed stop botton, for subsequent use show lamp normally opened contact, stand-by pump relay indicating light, the second fuse, power supply the 3rd pole sequentially electricity be serially connected.