Automatic drainage control circuit for sump

Abstract

The utility model provides an automatic drainage control circuit for a sump. The automatic drainage control circuit comprises a power supply, an alternating current contactor and a water pump motor which are positioned on a main loop, the first liquid level sensor, the second liquid level sensor and the interlocking switch are located on a control loop; the main loop is connected with the control loop in parallel; a power supply on the main loop is connected with a water pump motor after sequentially passing through a main contact of an alternating-current contactor and a thermal element of a thermal relay, and is connected in series with the water pump motor through the main contact of the alternating-current contactor; a first liquid level sensor on the control loop is connected in series with the automatic end of the interlocking switch; the second liquid level sensor is connected in parallel with the manual end of the interlocking switch; the first liquid level sensor and the second liquid level sensor are connected in series. When the automatic drainage device works, the interlocking switch is used for controlling the automatic control input and output of the liquid level sensor, automatic drainage of the water pump is achieved, the gradient of a pipeline does not need to be considered, and automatic starting and stopping of the water pump motor are achieved through the interlocking switch.

Description

Technical Field

[0001] This utility model belongs to the field of drainage control technology for sump pits, and specifically relates to an automatic drainage control circuit for sump pits. Background Technology

[0002] In thermal power plants, there are many water collection pits in the deeper cable trenches. Once it rains, the water collection pits can easily fill with water. If the water cannot be drained, the increasing amount of water may flood the cables, causing certain economic losses and safety hazards.

[0003] Currently, cable trench drainage mainly relies on natural flow drainage. When the sump is full, the water flows naturally through pipes to a nearby collection well. Natural flow drainage for cable trenches requires consideration of pipe slope, necessitating specific slope requirements for pipe installation. Furthermore, excessive water in the collection well can easily cause backflow into the cable trench, increasing the risk of cable flooding. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model proposes an automatic drainage control circuit for a sump pit, which can automatically drain water after the sump pit is full, greatly reducing the inspection work of operation and maintenance personnel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic drainage control circuit for a sump includes: a power supply, an AC contactor 5, and a water pump motor 10 located in the main circuit; and a first liquid level sensor 8, a second liquid level sensor 9, and an interlock switch 7 located in the control circuit; wherein the main circuit and the control circuit are connected in parallel.

[0007] The power supply is connected in series with the water pump motor 10 through the main contacts of the AC contactor 5.

[0008] The first liquid level sensor 8 is connected in series with the automatic end of the interlocking switch 7; the second liquid level sensor 9 is connected in parallel with the manual end of the interlocking switch 11; the first liquid level sensor 8 and the second liquid level sensor 9 are connected in series.

[0009] Furthermore, a thermal relay 6 is also installed on the main circuit;

[0010] The power supply passes sequentially through the main contacts of AC contactor 5, the thermal element of thermal relay 6, and then connects to water pump motor 10.

[0011] Furthermore, the control circuit also includes a first indicator light 1;

[0012] The first indicator light 1 is connected in series with the auxiliary contact of the AC contactor 5 and then in parallel with the main circuit.

[0013] Furthermore, the control circuit also includes a second indicator light 2.

[0014] The second indicator light 2 is connected in series with the auxiliary contact of the AC contactor 5 and then in parallel with the main circuit.

[0015] Furthermore, the control circuit also includes a start button 3 for triggering the motor to start and a stop button 4 for cutting off the control circuit. The start button 3 and the stop button 4 are connected in series. The start button 3 is connected in parallel with the first liquid level sensor 8. The stop button 4 is connected in series with the second liquid level sensor 9.

[0016] Furthermore, the second liquid level sensor 9 is also connected in series with the normally closed contact of the thermal relay 6 and the coil of the AC contactor 5.

[0017] Furthermore, the first liquid level sensor 8 is installed inside the sump to monitor the high liquid level in the sump.

[0018] Furthermore, the second liquid level sensor 9 is installed inside the sump to monitor the low liquid level in the sump.

[0019] Furthermore, the power supply uses a 380V power supply.

[0020] The effects described in the invention are merely those of the embodiments, and not all the effects of the invention. One of the above technical solutions has the following advantages or beneficial effects:

[0021] This invention discloses an automatic drainage control circuit for a sump, comprising: a power supply, an AC contactor, and a water pump motor located in the main circuit; and a first liquid level sensor, a second liquid level sensor, and an interlock switch located in the control circuit; wherein the main circuit and the control circuit are connected in parallel; the power supply is connected in series with the water pump motor through the main contacts of the AC contactor; the first liquid level sensor is connected in series with the automatic terminal of the interlock switch; the second liquid level sensor is connected in parallel with the manual terminal of the interlock switch; and the first and second liquid level sensors are connected in series. During operation, the interlock switch controls the automatic control of the liquid level sensors. When the interlock switch is in automatic mode, the automatic terminal is on and the manual terminal is off. The first liquid level sensor detects high liquid levels, and the second liquid level sensor detects low liquid levels. When the water level in the sump is higher than that of the first liquid level sensor, the first liquid level sensor sends a signal to the control circuit to start the water pump motor and begin automatic drainage, lowering the water level in the sump. When the water level in the sump is lower than that of the second liquid level sensor, the second liquid level sensor sends a signal to the control circuit to stop the water pump motor, ending the automatic drainage. When it is necessary to disengage the automatic control of the liquid level sensor, the interlock switch is deactivated from automatic mode, the automatic end is disconnected, the manual end is activated, and the water pump motor is deactivated from automatic start and stop. This invention achieves automatic drainage using a water pump without considering the slope of the pipeline, and the water pump motor is automatically started and stopped via an interlock switch. Attached Figure Description

[0022] Figure 1 This is a circuit diagram of an automatic drainage control circuit for a sump pit, as proposed in Embodiment 1 of this utility model;

[0023] Legend:

[0024] 1-First indicator light, 2-Second indicator light, 3-Start button, 4-Stop button, 5-AC contactor, 6-Thermal relay, 7-Interlock switch, 8-First liquid level sensor, 9-Second liquid level sensor, 10-Water pump motor. Detailed Implementation

[0025] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, reference numerals and / or letters may be repeated in different examples. This repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted to avoid unnecessarily limiting the present invention.

[0026] Example 1

[0027] Embodiment 1 of this utility model proposes an automatic drainage control circuit for sump pits, which is used to solve the technical problems existing in the drainage of sump pits in the prior art.

[0028] Figure 1 This is a circuit diagram of an automatic drainage control circuit for a sump pit according to Embodiment 1 of the present invention. The circuit includes: a power supply, an AC contactor 5 and a water pump motor 10 located on the main circuit; and a first liquid level sensor 8, a second liquid level sensor 9 and an interlock switch 7 located on the control circuit; and the main circuit and the control circuit are connected in parallel.

[0029] The power supply is connected in series with the water pump motor 10 through the main contacts of AC contactor 5;

[0030] The first liquid level sensor 8 is connected in series with the automatic end of the interlocking switch 7; the second liquid level sensor 9 is connected in parallel with the manual end of the interlocking switch 11; the first liquid level sensor 8 and the second liquid level sensor 9 are connected in series.

[0031] exist Figure 1 In the process, the main circuit power supply passes through the main contacts of the AC contactor 5 and the thermal element of the thermal relay 6 in sequence, and then connects to the water pump motor 10. The thermal relay 6 is used to monitor the overload status of the water pump motor 10, and cuts off the main circuit to protect the motor when overloaded.

[0032] The control loop includes an automatic control branch and a manual control branch, and the mode is switched by the interlocking switch 7. When the interlocking switch 7 is in the automatic state, the automatic end is turned on and the manual end is turned off, that is, ① and ② are turned on and ③ and ④ are turned off, which activates the automatic control process dominated by the first liquid level sensor 8 and the second liquid level sensor 9.

[0033] In automatic control mode, when the water level in the sump is higher than the monitoring position of the first liquid level sensor 8, the first liquid level sensor 8 closes, energizing the coil of the AC contactor 5, closing the main contacts of the AC contactor 5, and starting the water pump motor 10 to perform drainage operations.

[0034] In automatic control mode, when the water level in the sump drops below the monitoring position of the first liquid level sensor 9, the first liquid level sensor 9 disconnects, the coil of the AC contactor 5 is de-energized, the water pump motor 10 stops running, and the drainage ends.

[0035] When the interlock switch 7 is switched to the exit automatic state, the automatic end is disconnected and the manual end is connected, that is, ① and ② are disconnected and ③ and ④ are connected. The control circuit is switched to manual control mode, and the operator can manually start and stop the water pump motor 10 by operating the control button.

[0036] The control circuit also includes a start button 3 for triggering the motor to start and a stop button 4 for cutting off the control circuit. The start button 3 and the stop button 4 are connected in series. The start button 3 is connected in parallel with the first liquid level sensor 8. The stop button 4 is connected in series with the second liquid level sensor 9.

[0037] The start button 3 is a red start button, and the stop button 4 is a green stop button. The red start button 3 is used to trigger the control circuit related to starting the water pump motor 10, and the green stop button 4 is used to cut off the control circuit, so that the water pump motor 10 stops running. The buttons, together with the coil of the AC contactor 5 and the interlocking switch 7, form a complete control circuit.

[0038] The control circuit also includes a first indicator light 1; the first indicator light 1 is connected in series with the auxiliary contacts of the AC contactor 5 and then connected in parallel with the main circuit.

[0039] The control circuit also includes a second indicator light 2; the second indicator light 2 is connected in series with the auxiliary contact of the AC contactor 5 and then in parallel with the main circuit.

[0040] The first indicator light 1 is a green signal light, and the second indicator light 2 is a red signal light.

[0041] Both the green signal light 1 and the red signal light 2 are in conjunction with the auxiliary contacts of the AC contactor 5, and according to the engagement and disengagement states of the AC contactor 5, they respectively display the "run" and "stop" working states of the water pump motor 10.

[0042] As the core component for mode switching, the interlocking switch 7 flexibly switches between automatic control (based on the liquid level sensor) and manual control (based on the control button) by changing its on / off state of ①-② and ③-④. This adapts to the control requirements of the water pump motor 10 under different working conditions, ensuring the convenience of control mode switching and the compatibility of system operation.

[0043] The present invention, in Embodiment 1, discloses an automatic drainage control circuit for a sump. During operation, an interlock switch controls the activation and deactivation of the automatic control of the level sensor. When the interlock switch is in automatic mode, the automatic terminal is on and the manual terminal is off. The first level sensor detects high liquid levels, and the second level sensor detects low liquid levels. When the water level in the sump is higher than that of the first level sensor, the first level sensor sends a signal to the control circuit to start the water pump motor, initiating automatic drainage and lowering the water level in the sump. When the water level in the sump is lower than that of the second level sensor, the second level sensor sends a signal to the control circuit to stop the water pump motor, ending the automatic drainage. When it is necessary to deactivate the automatic control of the level sensor, the interlock switch is deactivated from automatic mode, the automatic terminal is off, the manual terminal is on, and the water pump motor stops automatically starting and stopping.

[0044] The present invention provides an automatic drainage control circuit for a sump, which realizes automatic drainage using a water pump without considering the slope of the pipe, and achieves automatic start and stop of the water pump motor through an interlock switch.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that the elements inherent in a process, method, article, or apparatus that includes a list of elements are included. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Additionally, portions of the technical solutions provided in the embodiments of this application that are consistent with the implementation principles of corresponding technical solutions in the prior art have not been described in detail to avoid excessive elaboration.

[0046] While the specific embodiments of this utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of this utility model. Those skilled in the art can make other modifications or variations based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. Various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of this utility model are still within the scope of protection of this utility model.

Claims

1. An automatic drainage control circuit for a sump pit, characterized in that, include: The main circuit includes a power supply, an AC contactor (5), and a water pump motor (10); and the control circuit includes a first level sensor (8), a second level sensor (9), and an interlock switch (7); and the main circuit is connected in parallel with the control circuit. The power supply is connected in series with the water pump motor (10) through the main contacts of the AC contactor (5); The first liquid level sensor (8) is connected in series with the automatic end of the interlock switch (7); the second liquid level sensor (9) is connected in parallel with the manual end of the interlock switch (7); the first liquid level sensor (8) and the second liquid level sensor (9) are connected in series.

2. The automatic drainage control circuit for a sump pit according to claim 1, characterized in that, A thermal relay (6) is also installed on the main circuit. The power supply passes through the main contacts of the AC contactor (5), the thermal element of the thermal relay (6), and then connects to the water pump motor (10).

3. The automatic drainage control circuit for a sump pit according to claim 1, characterized in that, The control circuit also includes a first indicator light (1). The first indicator light (1) is connected in series with the auxiliary contact of the AC contactor (5) and then connected in parallel with the main circuit.

4. The automatic drainage control circuit for a sump pit according to claim 1, characterized in that, The control circuit also includes a second indicator light (2). The second indicator light (2) is connected in series with the auxiliary contact of the AC contactor (5) and then connected in parallel with the main circuit.

5. The automatic drainage control circuit for a sump pit according to claim 1, characterized in that, The control circuit also includes a start button (3) for triggering the motor to start and a stop button (4) for cutting off the control circuit. The start button (3) and the stop button (4) are connected in series. The start button (3) is connected in parallel with the first liquid level sensor (8). The stop button (4) is connected in series with the second liquid level sensor (9).

6. The automatic drainage control circuit for a sump pit according to claim 1, characterized in that, The second liquid level sensor (9) is also connected in series with the normally closed contact of the thermal relay (6) and the coil of the AC contactor (5).

7. The automatic drainage control circuit for a sump pit according to claim 1, characterized in that, The first liquid level sensor (8) is installed in the sump to monitor the high liquid level in the sump.

8. The automatic drainage control circuit for a sump pit according to claim 1, characterized in that, The second liquid level sensor (9) is installed in the sump to monitor the low liquid level in the sump.

9. An automatic drainage control circuit for a sump pit according to any one of claims 1 to 8, characterized in that, The power supply is 380V.

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