Control circuit of sewage pump in negative first floor of rectifier substation

Abstract

The utility model discloses a control circuit of a sewage pump in a negative first floor of a rectifier substation, and relates to the field of water pump control. The water level monitoring timing circuit is connected in parallel with the sewage pump start-stop circuit; the light display circuit is connected in parallel with the water level monitoring timing circuit; the main circuit is used for driving and protecting different sewage pumps; the sewage pump starting and stopping circuit is used for controlling starting and pausing of different sewage pumps; the water level monitoring, timing and switching circuit is used for monitoring the water level change in the negative layer of the rectifier transformer substation in real time and switching different sewage discharge pumps to work according to the water level change in a timing manner so as to reduce directional movement of sewage; and the light conversion circuit is used for displaying the working state of the sewage pump through light with different colors. The working mode of the sewage pump is changed, and impact of sewage on the pipeline in the negative first floor of the rectifier transformer substation is avoided under the condition that drainage is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of water pump control, and particularly to a control circuit for the sewage pump in the first basement floor of a rectifier substation. Background Art

[0002] A large number of pipelines are laid in the first basement floor of the rectifier substation. Once these pipelines burst or leak, a large amount of sewage will accumulate. In addition, because the terrain of the first basement floor of the rectifier substation is relatively low, rainwater will also accumulate in the rainy seasons of spring and summer. In serious cases, the first basement floor of the rectifier substation may even be flooded. Therefore, it is particularly important to reasonably set up sewage pumps in the first basement floor of the rectifier substation.

[0003] At present, usually a single sewage pump is set to work in the pump house on the first basement floor of the rectifier substation, and its control circuit is only the most basic start-stop control circuit, which completely relies on manual control. That is, when drainage is required, the staff presses the start button, and after the sewage is drained, the staff presses the stop button again. In addition, when there is a large amount of sewage, since the area of the pump house exceeds 1000 square meters, continuous pumping by a single sewage pump will cause the directional movement of the water flow, which also leads to a large amount of sewage continuously impacting the pipelines laid in the first basement floor of the rectifier substation. Although it has little impact on the pipelines with relatively thick pipe walls, it has a great impact on the thin-walled pipelines used for convective heat transfer. Over time, it will cause them to crack and affect the effect of convective heat transfer.

[0004] Therefore, the existing control circuit of the sewage pump is relatively simple, and can only realize the start-stop control of the sewage pump, and cannot avoid the pipeline impact caused by drainage during its working state. Utility Model Content

[0005] The purpose of the present application is to provide a control circuit for the sewage pump in the first basement floor of a rectifier substation, which changes the working mode of the sewage pump and avoids the impact of sewage on the pipelines in the first basement floor of the rectifier substation under the condition of realizing drainage.

[0006] To achieve the above purpose, the present application provides the following solutions:

[0007] The present application provides a control circuit for the sewage pump in the first basement floor of a rectifier substation, and the control circuit for the sewage pump in the first basement floor of the rectifier substation includes: a main circuit, a sewage pump start-stop circuit, a water level monitoring timing switching circuit, and a lighting conversion circuit;

[0008] The sewage pump start-stop circuit is connected in parallel with the main circuit; the water level monitoring timing circuit is connected in parallel with the sewage pump start-stop circuit; the lighting display circuit is connected in parallel with the water level monitoring timing circuit;

[0009] The main circuit is used to drive and protect different sewage pumps; the start-stop circuit of the sewage pump is used to control the start and pause of different sewage pumps; the water level monitoring timing switching circuit is used to monitor the water level change in the first basement floor of the rectifier substation in real time, and time-switch different sewage pumps according to the water level change to reduce the directional movement of sewage; the lighting conversion circuit is used to display the working state of the sewage pump through lights of different colors;

[0010] Among them, the water level monitoring timing switching circuit includes: a first time relay, a second time relay, a high liquid level limit switch, a low liquid level limit switch and an intermediate relay;

[0011] The common end of the first time relay is connected to one end of the normally open contact of the high liquid level limit switch; one end of the normally open contact of the high liquid level limit switch is connected to one end of the normally open contact of the intermediate relay; the other end of the normally open contact of the high liquid level limit switch is respectively connected to one end of the normally open contact of the low liquid level limit switch and the other end of the normally open contact of the intermediate relay; the other end of the normally open contact of the low liquid level limit switch is connected to one end of the intermediate relay coil; the other end of the normally open contact of the intermediate relay is connected to one end of the normally closed contact of the second time relay; one end of the normally closed contact of the second time relay is connected to one end of the normally closed contact of the first time relay; the other end of the normally closed contact of the second time relay is connected to one end of the first time relay coil; the other end of the normally closed contact of the first time relay is connected to one end of the second time relay coil; the other end of the intermediate relay coil is connected to the other end of the first time relay coil; the other end of the first time relay coil is connected to the other end of the second time relay coil.

[0012] Optionally, the main circuit at least includes: a first motor circuit breaker, a second motor circuit breaker, a first AC contactor, a second AC contactor, a first sewage pump, a second sewage pump and a two-stage circuit breaker;

[0013] The first sewage pump is connected to the first AC contactor; the first AC contactor is connected to the first motor circuit breaker; the second sewage pump is connected to the second AC contactor; the second AC contactor is connected to the second motor circuit breaker; the second motor circuit breaker is connected in parallel with the first motor circuit breaker; the first end of the two-stage circuit breaker is connected to the second motor circuit breaker.

[0014] Optionally, the start-stop circuit of the sewage pump includes: an emergency stop button, a first button, a second button, a third button and a fourth button;

[0015] One end of the normally-closed contact of the emergency stop button is respectively connected to the second end of the two-stage circuit breaker and one end of the normally-open contact of the emergency stop button; one end of the normally-open contact of the emergency stop button is connected to one end of the normally-closed contact of the first motor circuit breaker; one end of the normally-closed contact of the first motor circuit breaker is connected to one end of the normally-closed contact of the second motor circuit breaker; the other end of the normally-open contact of the emergency stop button is connected to the other end of the normally-closed contact of the first motor circuit breaker; the other end of the normally-closed contact of the first motor circuit breaker is connected to the other end of the normally-closed contact of the second motor circuit breaker;

[0016] The other end of the normally-closed contact of the emergency stop button is connected to one end of the normally-open contact of the first motor circuit breaker; the other end of the normally-open contact of the first motor circuit breaker is connected to one end of the normally-open contact of the second motor circuit breaker; the other end of the normally-open contact of the second motor circuit breaker is respectively connected to one end of the normally-open contact of the first button and the common terminal of the first time relay; one end of the normally-open contact of the first button is connected to one end of the normally-open contact of the first AC contactor; one end of the normally-open contact of the first AC contactor is connected to one end of the normally-open contact of the third button; one end of the normally-open contact of the third button is connected to one end of the normally-open contact of the second AC contactor; the other end of the normally-open contact of the first button is respectively connected to one end of the normally-closed contact of the second button and the other end of the normally-open contact of the first AC contactor; the other end of the normally-closed contact of the second button is respectively connected to one end of the normally-open contact of the intermediate relay and one end of the coil of the first AC contactor; the other end of the normally-open contact of the intermediate relay is connected to one end of the normally-closed contact of the first time relay; the other end of the normally-open contact of the third button is respectively connected to one end of the normally-closed contact of the fourth button and the other end of the normally-open contact of the second AC contactor; the other end of the normally-closed contact of the fourth button is respectively connected to one end of the coil of the second AC contactor and one end of the normally-open contact of the first time relay; the other end of the coil of the first AC contactor is respectively connected to the fourth end of the two-stage relay and the other end of the coil of the second AC contactor; the other end of the coil of the second AC contactor is connected to the other end of the coil of the intermediate relay.

[0017] Optionally, the lighting conversion circuit includes: a first indicator light and a second indicator light;

[0018] One end of the first indicator light is connected to one end of the normally-open contact of the first time relay; the other end of the first indicator light is respectively connected to the other end of the coil of the second time relay and one end of the second indicator light; the other end of the second indicator light is connected to the other end of the normally-open contact of the emergency stop button.

[0019] Optionally, the main circuit further includes a three-stage circuit breaker, a fuse, and a leakage protector connected in series with the three-phase power supply in sequence; the leakage protector is further respectively connected to the first motor circuit breaker and the third end of the two-stage circuit breaker.

[0020] Optionally, the models of the first time relay and the second time relay are JX14A-00.

[0021] Optionally, the model of the intermediate relay is CHNT-JZX-22F / 2Z.

[0022] Optionally, the models of the first AC contactor and the second AC contactor are CJX1-22 / 22.

[0023] According to the specific embodiments provided by the present application, the following technical effects are disclosed by the present application:

[0024] The present application uses multiple sewage pumps to pump water. It can not only manually control any sewage pump to work through the start-stop circuit of the sewage pump, but also cooperate with the start-stop circuit of the sewage pump through the water level monitoring timing switching circuit. When the water level in the first basement floor of the rectifier substation rises to the set value, it can automatically control different sewage pumps to alternately pump water within the set time. At the same time, the working mode of alternately pumping water by different sewage pumps can effectively reduce the directional flow of sewage, making it have no specific flow direction, and greatly avoiding the impact damage of the water flow on the thin-walled pipeline. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is the circuit diagram of the main circuit in the control circuit of the sewage pump in the first basement floor of the rectifier substation provided by the embodiment of the present application;

[0027] Figure 2 It is the circuit diagram of the control circuit in the control circuit of the sewage pump in the first basement floor of the rectifier substation provided by the embodiment of the present application. Detailed Embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0029] The purpose of this application is to provide a control circuit for the sewage pump in the negative first floor of a rectifier substation, which changes the working mode of the sewage pump and avoids the impact of sewage on the pipelines in the negative first floor of the rectifier substation under the condition of realizing drainage.

[0030] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Embodiment 1

[0032] This embodiment provides a control circuit for the sewage pump in the negative first floor of a rectifier substation, which specifically includes: a main circuit, a sewage pump start-stop circuit, a water level monitoring and timing switching circuit, and a lighting transformation circuit;

[0033] The sewage pump start-stop circuit is connected in parallel with the main circuit; the water level monitoring and timing circuit is connected in parallel with the sewage pump start-stop circuit; the lighting display circuit is connected in parallel with the water level monitoring and timing circuit;

[0034] The main circuit is used to drive and protect different sewage pumps; the sewage pump start-stop circuit is used to control the start and pause of different sewage pumps; the water level monitoring and timing switching circuit is used to monitor the water level change in the negative first floor of the rectifier substation in real time, and time-switch different sewage pumps according to the water level change to reduce the directional movement of sewage; the lighting transformation circuit is used to display the working state of the sewage pump through lights of different colors.

[0035] Among them, the water level monitoring and timing switching circuit includes: a first time relay, a second time relay, a high liquid level limit switch, a low liquid level limit switch, and an intermediate relay;

[0036] The common terminal of the first time relay is connected to one end of the normally open contact of the high liquid level limit switch; one end of the normally open contact of the high liquid level limit switch is connected to one end of the normally open contact of the intermediate relay; the other end of the normally open contact of the high liquid level limit switch is respectively connected to one end of the normally open contact of the low liquid level limit switch and the other end of the normally open contact of the intermediate relay; the other end of the normally open contact of the low liquid level limit switch is connected to one end of the intermediate relay coil; the other end of the normally open contact of the intermediate relay is connected to one end of the normally closed contact of the second time relay; one end of the normally closed contact of the second time relay is connected to one end of the normally closed contact of the first time relay; the other end of the normally closed contact of the second time relay is connected to one end of the first time relay coil; the other end of the normally closed contact of the first time relay is connected to one end of the second time relay coil; the other end of the intermediate relay coil is connected to the other end of the first time relay coil; the other end of the first time relay coil is connected to the other end of the second time relay coil.

[0037] In one example, the models of the first time relay and the second time relay are JX14A-00, and the model of the intermediate relay is CHNT-JZX-22F / 2Z(D).

[0038] Further, the main circuit at least includes: a first motor circuit breaker, a second motor circuit breaker, a first AC contactor, a second AC contactor, a first sewage pump, a second sewage pump, and a two-stage circuit breaker;

[0039] The first sewage pump is connected to the first AC contactor; the first AC contactor is connected to the first motor circuit breaker; the second sewage pump is connected to the second AC contactor; the second AC contactor is connected to the second motor circuit breaker; the second motor circuit breaker is connected in parallel with the first motor circuit breaker; the first end of the two-stage circuit breaker is connected to the second motor circuit breaker;

[0040] In addition, the main circuit further includes a three-stage circuit breaker, a fuse, and a leakage protector connected in series with the three-phase power supply in sequence; the leakage protector is also respectively connected to the first motor circuit breaker and the third end of the two-stage circuit breaker.

[0041] Further, the start-stop circuit of the sewage pump includes: an emergency stop button, a first button, a second button, a third button, and a fourth button;

[0042] One end of the normally closed contact of the emergency stop button is respectively connected to the second end of the two-stage circuit breaker and one end of the normally open contact of the emergency stop button; one end of the normally open contact of the emergency stop button is connected to one end of the normally closed contact of the first motor circuit breaker; one end of the normally closed contact of the first motor circuit breaker is connected to one end of the normally closed contact of the second motor circuit breaker; the other end of the normally open contact of the emergency stop button is connected to the other end of the normally closed contact of the first motor circuit breaker; the other end of the normally closed contact of the first motor circuit breaker is connected to the other end of the normally closed contact of the second motor circuit breaker;

[0043] The other end of the normally closed contact of the emergency stop button is connected to one end of the normally open contact of the first motor circuit breaker; the other end of the normally open contact of the first motor circuit breaker is connected to one end of the normally open contact of the second motor circuit breaker; the other end of the normally open contact of the second motor circuit breaker is respectively connected to one end of the normally open contact of the first button and the common terminal of the first time relay; one end of the normally open contact of the first button is connected to one end of the normally open contact of the first AC contactor; one end of the normally open contact of the first AC contactor is connected to one end of the normally open contact of the third button; one end of the normally open contact of the third button is connected to one end of the normally open contact of the second AC contactor; the other end of the normally open contact of the first button is respectively connected to one end of the normally closed contact of the second button and the other end of the normally open contact of the first AC contactor; the other end of the normally closed contact of the second button is respectively connected to one end of the normally open contact of the intermediate relay and one end of the coil of the first AC contactor; the other end of the normally open contact of the intermediate relay is connected to one end of the normally closed contact of the first time relay; the other end of the normally open contact of the third button is respectively connected to one end of the normally closed contact of the fourth button and the other end of the normally open contact of the second AC contactor; the other end of the normally closed contact of the fourth button is respectively connected to one end of the coil of the second AC contactor and one end of the normally open contact of the first time relay; the other end of the coil of the first AC contactor is respectively connected to the fourth terminal of the two-stage relay and the other end of the coil of the second AC contactor; the other end of the coil of the second AC contactor is connected to the other end of the coil of the intermediate relay.

[0044] In one example, the model of the emergency stop button is NP2-BS545, and the models of the first button, the second button, the third button and the fourth button are NP2-BA45.

[0045] Furthermore, the lighting change circuit includes: a first indicator light and a second indicator light;

[0046] One end of the first indicator light is connected to one end of the normally open contact of the first time relay; the other end of the first indicator light is respectively connected to the other end of the coil of the second time relay and one end of the second indicator light; the other end of the second indicator light is connected to the other end of the normally open contact of the emergency stop button.

[0047] Embodiment 2

[0048] This embodiment provides an actual application scenario of the control circuit of the internal sewage pump on the first basement floor of a rectifier substation, which is as follows:

[0049] As Figure 1 shown, the connection relationship of the main circuit in the control circuit of the internal sewage pump on the first basement floor of this rectifier substation is:

[0050] The three-phase power supply of U, V, and W is connected to the three-pole circuit breaker QF1. The U-phase is connected to the No. 1 terminal of the three-pole circuit breaker QF1, the V-phase is connected to the No. 3 terminal of the three-pole circuit breaker QF1, the W-phase is connected to the No. 5 terminal of the three-pole circuit breaker QF1, and the neutral line N in the three-phase power supply system is connected to the No. 7 terminal of the residual current device RCD;

[0051] The No. 2 terminal of the three-pole circuit breaker QF1 is connected to the No. 1 terminal of the fuse FU1, the No. 4 terminal of the three-pole circuit breaker QF1 is connected to the No. 3 terminal of the fuse FU1, and the No. 6 terminal of the three-pole circuit breaker QF1 is connected to the No. 5 terminal of the fuse FU1;

[0052] The No. 2 terminal of the fuse FU1 is connected to the No. 1 terminal of the residual current device RCD, the No. 4 terminal of the fuse FU1 is connected to the No. 3 terminal of the residual current device RCD, and the No. 6 terminal of the fuse FU1 is connected to the No. 5 terminal of the residual current device RCD;

[0053] The No. 2 terminal of the residual current device RCD is connected to the L1 terminal of the motor circuit breaker QF2, and the No. 2 terminal of the residual current device RCD is also connected to the L1 terminal of the motor circuit breaker QF3. The No. 4 terminal of the residual current device RCD is connected to the L3 terminal of the motor circuit breaker QF2, and the No. 4 terminal of the residual current device RCD is also connected to the L3 terminal of the motor circuit breaker QF3. The No. 6 terminal of the residual current device RCD is connected to the L5 terminal of the motor circuit breaker QF2, and the No. 6 terminal of the residual current device RCD is also connected to the L5 terminal of the motor circuit breaker QF3. The No. 8 terminal of the residual current device RCD is connected to the No. 3 terminal of the two-pole circuit breaker QF4;

[0054] The L5 terminal of the motor circuit breaker QF3 is also connected to the No. 1 terminal of the two-pole circuit breaker QF4. The T2 terminal of the motor circuit breaker QF2 is connected to the U1 terminal of the normally open contact of the AC contactor KM1. The T4 terminal of the motor circuit breaker QF2 is connected to the V1 terminal of the normally open contact of the AC contactor KM1. The T6 terminal of the motor circuit breaker QF2 is connected to the W1 terminal of the normally open contact of the AC contactor KM1;

[0055] The U2 terminal of the normally open contact of the AC contactor KM1 is connected to the 1 terminal of the sewage pump M1. The V2 terminal of the normally open contact of the AC contactor KM1 is connected to the 2 terminal of the sewage pump M1. The W2 terminal of the normally open contact of the AC contactor KM1 is connected to the N terminal of the sewage pump M1. The PE grounding terminal of the sewage pump M1 is connected to the No. 1 terminal of the grounding device PE;

[0056] Terminal T2 of motor circuit breaker QF3 is connected to terminal U1 of the normally open contact of AC contactor KM2. Terminal T4 of motor circuit breaker QF3 is connected to terminal V1 of the normally open contact of AC contactor KM2. Terminal T6 of motor circuit breaker QF3 is connected to terminal W1 of the normally open contact of AC contactor KM2.

[0057] Terminal U2 of the normally open contact of AC contactor KM2 is connected to terminal 1 of sewage pump M2. Terminal V2 of the normally open contact of AC contactor KM2 is connected to terminal 2 of sewage pump M2. Terminal W2 of the normally open contact of AC contactor KM2 is connected to terminal N of sewage pump M2. The PE grounding terminal of sewage pump M2 is connected to terminal 2 of grounding device PE.

[0058] As Figure 2 shown, the connection relationship of the control loop in the control circuit of the sewage pump in the first basement floor of this rectifier substation is as follows:

[0059] Terminal 2 of two-stage circuit breaker QF4 is connected to terminal 1 of the normally closed contact of emergency stop button S0. Terminal 1 of the normally closed contact of emergency stop button S0 is connected to terminal 3 of the normally open contact of emergency stop button S0. Terminal 3 of the normally open contact of emergency stop button S0 is connected to terminal 21 of the normally closed contact of motor circuit breaker QF2. Terminal 21 of the normally closed contact of motor circuit breaker QF2 is connected to terminal 21 of the normally closed contact of motor circuit breaker QF3.

[0060] Terminal 2 of the normally closed contact of emergency stop button S0 is connected to terminal 13 of the normally open contact of motor circuit breaker QF2. Terminal 14 of the normally open contact of motor circuit breaker QF2 is connected to terminal 13 of the normally open contact of motor circuit breaker QF3. Terminal 14 of the normally open contact of motor circuit breaker QF3 is connected to terminal 3 of the normally open contact of button SB1. Terminal 4 of the normally open contact of motor circuit breaker QF3 is connected to terminal 6 of time relay KT1. Terminal 6 of time relay KT1 is connected to terminal 3 of the normally open contact of high liquid level limit switch SQ1. Terminal 3 of the normally open contact of high liquid level limit switch SQ1 is connected to terminal 3 of the normally open contact of intermediate relay KA1.

[0061] The No. 3 terminal of the normally open contact of button SB1 is connected to the No. 3 terminal of the normally open contact of contactor KM1. The No. 3 terminal of the normally open contact of contactor KM1 is then connected to the No. 3 terminal of the normally open contact of button SB3. The No. 3 terminal of the normally open contact of button SB3 is then connected to the No. 3 terminal of the normally open contact of contactor KM2. The No. 4 terminal of the normally open contact of button SB1 is connected to the No. 4 terminal of the normally open contact of contactor KM1. The No. 4 terminal of the normally open contact of button SB1 is then connected to the No. 1 terminal of the normally closed contact of button SB2. The No. 2 terminal of the normally closed contact of button SB2 is connected to the No. 8 terminal of the normally open contact of intermediate relay KA1. The No. 3 terminal of the normally open contact of intermediate relay KA1 is connected to the No. 8 terminal of the normally closed contact of time relay KT1;

[0062] The No. 2 terminal of the normally closed contact of button SB2 is then connected to the A1 terminal of the coil of contactor KM1. The No. 4 terminal of the normally open contact of button SB3 is connected to the No. 4 terminal of the normally open contact of contactor KM2. The No. 4 terminal of the normally open contact of button SB3 is then connected to the No. 1 terminal of the normally closed contact of button SB4. The No. 2 terminal of the normally closed contact of button SB4 is connected to the No. 7 terminal of the normally open contact of time relay KT1. The No. 2 terminal of the normally closed contact of button SB4 is then connected to the A1 terminal of the coil of contactor KM2;

[0063] The No. 4 terminal of the normally open contact of high liquid level limit switch SQ1 is connected to the No. 3 terminal of the normally open contact of low liquid level limit switch SQ2. The No. 4 terminal of the normally open contact of high liquid level limit switch SQ1 is then connected to the No. 4 terminal of the normally open contact of intermediate relay KA1. The No. 4 terminal of the normally open contact of intermediate relay KA1 is then connected to the No. 3 terminal of the normally closed contact of time relay KT2. The No. 3 terminal of the normally closed contact of time relay KT2 is then connected to the No. 3 terminal of the normally open contact of time relay KT1. The No. 3 terminal of the normally open contact of time relay KT1 is then connected to the x1 terminal of indicator light L1;

[0064] The No. 4 terminal of the normally open contact of low liquid level limit switch SQ2 is connected to the A1 terminal of the coil of intermediate relay KA1. The No. 5 terminal of the normally closed contact of time relay KT2 is connected to the A1 terminal of the coil of time relay KT1. The No. 4 terminal of the normally open contact of time relay KT1 is connected to the A1 terminal of the coil of time relay KT2;

[0065] The No. 4 terminal of the normally open contact of emergency stop button S0 is connected to the x1 terminal of indicator light L2. The No. 4 terminal of the normally open contact of stop button S0 is then connected to the No. 22 terminal of the normally closed contact of motor circuit breaker QF2. The No. 22 terminal of the normally closed contact of motor circuit breaker QF2 is then connected to the No. 22 terminal of the normally closed contact of motor circuit breaker QF3;

[0066] The x2 terminal of the indicator light L2 is connected to the x2 terminal of the indicator light L1. The x2 terminal of the indicator light L1 is connected to the A2 terminal of the coil of the time relay KT2. The A2 terminal of the coil of the time relay KT2 is connected to the A2 terminal of the coil of the time relay KT1. The A2 terminal of the coil of the time relay KT1 is connected to the A2 terminal of the coil of the intermediate relay KA1. The A2 terminal of the coil of the intermediate relay KA1 is connected to the A2 terminal of the coil of the contactor KM2. The A2 terminal of the coil of the contactor KM2 is connected to the A2 terminal of the coil of the contactor KM1. The A2 terminal of the coil of the contactor KM1 is connected to the No. 4 terminal of the two-stage circuit breaker QF4.

[0067] Based on the above analysis, the specific working principle of the control circuit of the sewage pump in the negative first floor of the rectifier substation is as follows:

[0068] In this embodiment, two sewage pumps are provided, namely M1 and M2.

[0069] When the start button SB1 is pressed in the control circuit, the coil of the AC contactor KM1 is energized, and its normally open contact closes to complete self-locking. At this time, the sewage pump M1 is turned on and starts to drain water. When the button SB2 is pressed, the coil of KM1 loses power and the sewage pump stops.

[0070] When the start button SB3 is pressed in the control circuit, the coil of the AC contactor KM2 is energized, and its normally open contact closes to complete self-locking. At this time, the sewage pump M2 is turned on and starts to drain water. When the button SB4 is pressed, the coil of KM2 loses power and the sewage pump stops.

[0071] When the sewage level rises to the low liquid level limit switch, the sewage pump automatically drains water, and the low liquid level limit switch SQ2 closes. When the water level continues to rise to the high liquid level limit switch, the high liquid level limit switch SQ1 closes. At this time, the intermediate relay KA1 is energized, and its normally open contact closes. The coil of the AC contactor KM1 is energized, and the sewage pump M1 is turned on and starts to drain water. When the coil of KA1 is energized, the coil of KT1 will also be energized. After 60s, KT1 operates (the set time of the time relays KT1 and KT2 is both 60s). Its normally open contact closes and its normally closed contact opens. At this time, the coil of KM1 loses power and the coil of KM2 is energized. The sewage pump M1 stops and switches to the sewage pump M2 for operation. At the same time, the coil of KT2 is connected. After 60s, KT2 operates. Its normally closed contact opens. At this time, the coil of KT1 loses power. Its normally open contact of KT1 opens and its normally closed contact closes. The coil of the AC contactor KM2 loses power and the coil of the AC contactor KM1 is energized. The sewage pump M1 operates and the sewage pump M2 stops, and this state circulates. Finally, when the water level drops to the low liquid level limit switch SQ2, SQ2 disconnects, the intermediate relay KA1 loses power, and the two sewage pumps stop.

[0072] When the sewage pump automatically drains water, the yellow indicator light L1 is always on.

[0073] When an emergency occurs during operation, the emergency stop button S0 can be pressed. At this time, the entire control circuit loses power, the sewage pump stops, and at the same time, the normally open contact of S0 closes to turn on the red indicator light L2.

[0074] When the sewage pump M1 is overloaded during operation, the motor circuit breaker QF2 operates at this time, cutting off the main circuit. At the same time, its normally open contact changes from closed to open, cutting off the control circuit, and its normally closed contact changes from open to closed, turning on the red indicator light L2.

[0075] When the sewage pump M2 is overloaded during operation, the motor circuit breaker QF3 operates at this time, cutting off the main circuit. At the same time, its normally open contact changes from closed to open, cutting off the control circuit, and its normally closed contact changes from open to closed, turning on the red indicator light L2.

[0076] The yellow indicator light L1 being on represents that the sewage pump is working automatically, and the red indicator light L2 being on represents that the sewage pump is faulty or the emergency stop button has been pressed (emergency situation).

[0077] The red indicator light L1 and the yellow indicator light L2 are installed at the entrance of the pump house.

[0078] In summary, this application fully utilizes the most basic electrical components to achieve both automatic control and manual control of the water pump, and makes full use of the function of mutual switching between the two water pumps to effectively prevent the water flow from flowing in one direction, preventing the problem that the thin-walled water pipeline on the first basement floor of the rectifier substation is impacted and worn by the directional water flow, and eventually causing the water pipe wall to rupture.

[0079] In this specification, each embodiment is described in a progressive manner. The key points of each embodiment are the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0080] Specific examples are used in this article to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those of ordinary skill in the art, based on the idea of this application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. The control circuit of the sewage pump in the first basement floor of a rectifier substation, characterized in that, The control circuit of the sewage pump in the first basement floor of the rectifier substation includes: a main circuit, a sewage pump start-stop circuit, a water level monitoring timing switching circuit, and a lighting conversion circuit; The sewage pump start-stop circuit is connected in parallel with the main circuit; the water level monitoring timing circuit is connected in parallel with the sewage pump start-stop circuit; the lighting display circuit is connected in parallel with the water level monitoring timing circuit; The main circuit is used to drive and protect different sewage pumps; the sewage pump start-stop circuit is used to control the start and pause of different sewage pumps; the water level monitoring timing switching circuit is used to monitor the water level change in the first basement floor of the rectifier substation in real time, and time-switch different sewage pumps according to the water level change to reduce the directional movement of sewage; the lighting conversion circuit is used to display the working state of the sewage pump through lights of different colors; Among them, the water level monitoring timing switching circuit includes: a first time relay, a second time relay, a high liquid level limit switch, a low liquid level limit switch, and an intermediate relay; The common terminal of the first time relay is connected to one end of the normally open contact of the high liquid level limit switch; one end of the normally open contact of the high liquid level limit switch is connected to one end of the normally open contact of the intermediate relay; the other end of the normally open contact of the high liquid level limit switch is respectively connected to one end of the normally open contact of the low liquid level limit switch and the other end of the normally open contact of the intermediate relay; the other end of the normally open contact of the low liquid level limit switch is connected to one end of the intermediate relay coil; the other end of the normally open contact of the intermediate relay is connected to one end of the normally closed contact of the second time relay; one end of the normally closed contact of the second time relay is connected to one end of the normally closed contact of the first time relay; the other end of the normally closed contact of the second time relay is connected to one end of the first time relay coil; the other end of the normally closed contact of the first time relay is connected to one end of the second time relay coil; the other end of the intermediate relay coil is connected to the other end of the first time relay coil; the other end of the first time relay coil is connected to the other end of the second time relay coil.

2. The control circuit of the sewage pump in the inner row on the first basement floor of the rectifier substation according to claim 1, characterized in that, The main circuit at least includes: a first motor circuit breaker, a second motor circuit breaker, a first AC contactor, a second AC contactor, a first sewage pump, a second sewage pump, and a two-stage circuit breaker; The first sewage pump is connected to the first AC contactor; the first AC contactor is connected to the first motor circuit breaker; the second sewage pump is connected to the second AC contactor; the second AC contactor is connected to the second motor circuit breaker; the second motor circuit breaker is connected in parallel with the first motor circuit breaker; the first end of the two-stage circuit breaker is connected to the second motor circuit breaker.

3. The control circuit of the sewage pump in the inner layer of the first basement of the rectifier substation according to claim 2, characterized in that, The sewage pump start-stop circuit includes: an emergency stop button, a first button, a second button, a third button, and a fourth button; One end of the normally closed contact of the emergency stop button is respectively connected to the second end of the two-stage circuit breaker and one end of the normally open contact of the emergency stop button; one end of the normally open contact of the emergency stop button is connected to one end of the normally closed contact of the first motor circuit breaker; one end of the normally closed contact of the first motor circuit breaker is connected to one end of the normally closed contact of the second motor circuit breaker; the other end of the normally open contact of the emergency stop button is connected to the other end of the normally closed contact of the first motor circuit breaker; the other end of the normally closed contact of the first motor circuit breaker is connected to the other end of the normally closed contact of the second motor circuit breaker; The other end of the normally closed contact of the emergency stop button is connected to one end of the normally open contact of the first motor circuit breaker; the other end of the normally open contact of the first motor circuit breaker is connected to one end of the normally open contact of the second motor circuit breaker; the other end of the normally open contact of the second motor circuit breaker is respectively connected to one end of the normally open contact of the first button and the common terminal of the first time relay; one end of the normally open contact of the first button is connected to one end of the normally open contact of the first AC contactor; one end of the normally open contact of the first AC contactor is connected to one end of the normally open contact of the third button; one end of the normally open contact of the third button is connected to one end of the normally open contact of the second AC contactor; the other end of the normally open contact of the first button is respectively connected to one end of the normally closed contact of the second button and the other end of the normally open contact of the first AC contactor; the other end of the normally closed contact of the second button is respectively connected to one end of the normally open contact of the intermediate relay and one end of the coil of the first AC contactor; the other end of the normally open contact of the intermediate relay is connected to one end of the normally closed contact of the first time relay; the other end of the normally open contact of the third button is respectively connected to one end of the normally closed contact of the fourth button and the other end of the normally open contact of the second AC contactor; the other end of the normally closed contact of the fourth button is respectively connected to one end of the coil of the second AC contactor and one end of the normally open contact of the first time relay; the other end of the coil of the first AC contactor is respectively connected to the fourth end of the two-stage relay and the other end of the coil of the second AC contactor; the other end of the coil of the second AC contactor is connected to the other end of the coil of the intermediate relay.

4. The control circuit of the sewage pump in the inner layer of the first basement floor of the rectifier substation according to claim 3, characterized in that, The light conversion circuit includes: a first indicator light and a second indicator light; One end of the first indicator light is connected to one end of the normally open contact of the first time relay; the other end of the first indicator light is respectively connected to the other end of the coil of the second time relay and one end of the second indicator light; the other end of the second indicator light is connected to the other end of the normally open contact of the emergency stop button.

5. The control circuit of the sewage pump in the inner row on the first basement floor of the rectifier substation according to claim 2, characterized in that, The main circuit further includes a three-stage circuit breaker, a fuse and a leakage protector connected in series with the three-phase power supply in sequence; the leakage protector is also respectively connected to the third end of the first motor circuit breaker and the two-stage circuit breaker.

6. The control circuit of the sewage pump in the inner row on the first basement floor of the rectifier substation according to claim 1, characterized in that, The models of the first time relay and the second time relay are JX14A-00.

7. The control circuit of the sewage pump in the first basement floor of the rectifier substation according to claim 1, characterized in that, The model of the intermediate relay is CHNT-JZX-22F / 2Z.

8. The control circuit of the sewage pump in the inner layer of the first basement floor of the rectifier substation according to claim 2, characterized in that, The models of the first AC contactor and the second AC contactor are CJX1-22 / 22.

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