Automatic circulating water pump control system for cooling lithium iron phosphate equipment

Abstract

The utility model relates to the technical field of automatic control, and particularly discloses an automatic circulating water pump control system for cooling lithium iron phosphate equipment, which is characterized in that a wire inlet end of a local remote switching button is connected with a live wire, and two wire outlet ends are respectively connected with a local control circuit and a remote control circuit; the local control circuit comprises a limit switch SQ1, a normally closed button switch SB1, a normally open button switch SB2 and an intermediate relay KA1; the remote control circuit comprises a limit switch SQ2, a normally closed button switch SB3, a normally open button switch SB4, an intermediate relay KA2 and an intermediate relay KA10, and a coil of the intermediate relay KA10 is controlled by the PLC system. The problems that in the prior art, a hot water pump control cabinet can operate only by manually clicking a start button, the functions of automatic operation and automatic pump operation switching are not achieved, pump starting, stopping and switching need to be manually operated, and the labor intensity of workers is increased are solved.

Description

Technical Field

[0001] The present application relates to the field of automatic control technology, and in particular to an automatic circulating water pump control system for cooling lithium iron phosphate equipment. Background Art

[0002] In the actual production process, the existing hot water pump control cabinet requires manual clicking of the start button to operate, and does not have the functions of automatic operation and automatic switching of pump operation. Starting and stopping the pump and switching also require manual operation, which increases the labor intensity of personnel. Summary of the invention

[0003] The purpose of the present application is to provide an automatic circulating water pump control system for cooling lithium iron phosphate equipment, so as to solve the problem that in the prior art, the hot water pump control cabinet needs to be manually started by clicking the start button before it can be operated, and does not have the automatic operation and automatic switching pump operation functions. The starting and stopping of the pump and the switching also require manual operation, which increases the labor intensity of personnel.

[0004] To achieve the above purpose, the embodiment of the present application provides an automatic circulating water pump control system for cooling lithium iron phosphate equipment, including: a local remote switching button, a local control circuit, a remote control circuit, a main pump delay timing circuit, a self-priming pump protection time circuit, a liquid level relay circuit, a main pump delay start circuit, and a self-priming pump operation circuit, wherein:

[0005] The incoming end of the local remote switching button is connected to the live wire, and the two outgoing ends are connected to the local control circuit and the remote control circuit respectively;

[0006] The local control circuit includes a limit switch SQ1, a normally closed button switch SB1, a normally open button switch SB2, and an intermediate relay KA1, wherein a first end of the limit switch SQ1 is connected to an output terminal of a local remote switching button, a second end of the limit switch SQ1 is connected to a first end of the normally closed button switch SB1, a second end of the normally closed button switch SB1 is connected to a first end of the normally open button switch SB2, a second end of the normally open button switch SB2 is connected to a first end of the coil of the intermediate relay KA1, a second end of the coil of the intermediate relay KA1 is connected to a neutral line, and a first end and a second end of a moving contact of the intermediate relay KA1 are connected to a first end and a second end of the normally open button switch SB2, respectively;

[0007] The remote control circuit includes a limit switch SQ2, a normally closed button switch SB3, a normally open button switch SB4, an intermediate relay KA2, and an intermediate relay KA10. The first end of the limit switch SQ2 is connected to the other output end of the local remote switching button, the second end of the limit switch SQ2 is connected to the first end of the normally closed button switch SB3, the second end of the normally closed button switch SB3 is connected to the first end of the normally open button switch SB4, the second end of the normally open button switch SB4 is connected to the first end of the intermediate relay KA2 coil, the second end of the intermediate relay KA2 coil is connected to the neutral line, the first end and the second end of the intermediate relay KA2 moving contact are respectively connected to the first end and the second end of the normally open button switch SB4, the first end of the intermediate relay KA10 moving contact is connected to the first end of the limit switch SQ2, the second end of the intermediate relay KA10 moving contact is connected to the first end of the intermediate relay KA2 coil, and the intermediate relay KA10 coil is controlled by the PLC system.

[0008] Optionally, the main pump delay timing circuit includes a time relay KT1, a first end of a coil of which is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to a neutral line.

[0009] Optionally, the self-priming pump protection time circuit includes a time relay KT2, a first end of a coil of which is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to the neutral line.

[0010] Optionally, the liquid level relay circuit includes a liquid level meter KL1, a first end of a coil of which is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to a neutral line.

[0011] Optionally, the air return valve control circuit includes an intermediate relay KA3, a first end of a coil of which is connected to the second ends of the normally closed contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to the neutral line.

[0012] Optionally, the main pump delayed start circuit includes an intermediate relay KA4, a liquid level meter KL1, a thermal relay FR1, a time relay KT1, and an intermediate relay KA4. The first end of the normally closed contact of the intermediate relay KA4 is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and the second end of the normally closed contact is connected to the first end of the normally broken contact of the thermal relay FR1. The first and second ends of the normally closed contact of the liquid level meter KL1 are respectively connected to the first and second ends of the normally closed contact of the intermediate relay KA4. The second end of the normally broken contact of the thermal relay FR1 is connected to the first end of the normally closed contact of the time relay KT1. The second end of the normally closed contact of the time relay KT1 is connected to the first end of the coil of the intermediate relay KA4, and the second end of the coil of the intermediate relay KA4 is connected to the neutral line.

[0013] Optionally, the self-priming pump operation circuit includes a liquid level meter KL1, a thermal relay FR2, a time relay KT2, and an intermediate relay KA4. The first end of the moving-break contact of the liquid level meter KL1 is connected to the second end of the making contacts of the intermediate relays KA1 and KA2, and the second end of its moving-break contact is connected to the first end of the moving-break contact of the thermal relay FR2, the second end of the moving-break contact of the thermal relay FR2 is connected to the first end of the moving-break contact of the time relay KT2, the second end of the moving-break contact of the time relay KT2 is connected to the first end of the moving-break contact of the intermediate relay KA4, the second end of the moving-break contact of the intermediate relay KA4 is connected to the first end of the coil of the contactor KM4, and the second end of the coil of the contactor KM4 is connected to the neutral line.

[0014] Optionally, the self-priming pump operation indication circuit comprises an indicator light HL3, and two ends of the indicator light HL3 are respectively connected to a first end and a second end of the coil of the contactor KM4.

[0015] Optionally, the parking air return valve circuit includes an intermediate relay KA3 and a solenoid valve YV1, wherein the first end of the moving-break contact of the intermediate relay KA3 is connected to the live wire, the second end of the moving-break contact is connected to the first end of the solenoid valve YV1, and the second end of the solenoid valve YV1 is connected to the neutral wire.

[0016] Optionally, the self-priming pump switching circuit includes a contactor KM4 and a solenoid valve YVM, wherein the first end of the normally closed contact of the contactor KM4 is connected to the live wire, the second end of the normally closed contact is connected to the first end of the solenoid valve YVM, the second end of the solenoid valve YVM is connected to the neutral wire, and the two ends of the normally closed contact of the contactor KM4 are respectively connected to the first end and the second end of the normally closed contact of the contactor KM4.

[0017] The embodiments of the present application have the following advantages:

[0018] The embodiment of the present application provides an automatic circulating water pump control system for cooling lithium iron phosphate equipment, including: a local remote switching button, a local control circuit, a remote control circuit, a main pump delay timing circuit, a self-priming pump protection time circuit, a liquid level relay circuit, a main pump delay start circuit, and a self-priming pump operation circuit, wherein the input end of the local remote switching button is connected to the live wire, and the two output ends are respectively connected to the local control circuit and the remote control circuit, and the local control circuit includes a limit switch SQ1, a normally closed button switch SB1, a normally open button switch SB2, and an intermediate relay KA1, wherein the first end of the limit switch SQ1 is connected to an output end of the local remote switching button, the second end of the limit switch SQ1 is connected to the first end of the normally closed button switch SB1, the second end of the normally closed button switch SB1 is connected to the first end of the normally open button switch SB2, the second end of the normally open button switch SB2 is connected to the first end of the coil of the intermediate relay KA1, the second end of the coil of the intermediate relay KA1 is connected to the neutral line, and the first end of the moving contact of the intermediate relay KA1 is connected to the neutral line. The first end and the second end are respectively connected to the first end and the second end of the normally open button switch SB2; the remote control circuit includes a limit switch SQ2, a normally closed button switch SB3, a normally open button switch SB4, an intermediate relay KA2, and an intermediate relay KA10. The first end of the limit switch SQ2 is connected to the other output terminal of the local remote switching button, the second end of the limit switch SQ2 is connected to the first end of the normally closed button switch SB3, the second end of the normally closed button switch SB3 is connected to the first end of the normally open button switch SB4, the second end of the normally open button switch SB4 is connected to the first end of the intermediate relay KA2 coil, and the second end of the intermediate relay KA2 coil is connected to the neutral line. The first end and the second end of the intermediate relay KA2 moving contact are respectively connected to the first end and the second end of the normally open button switch SB4, the first end of the intermediate relay KA10 moving contact is connected to the first end of the limit switch SQ2, and the second end of the intermediate relay KA10 moving contact is connected to the first end of the intermediate relay KA2 coil. The intermediate relay KA10 coil is controlled by the PLC system.

[0019] Compared with the prior art, the automatic circulating water pump control system for cooling lithium iron phosphate equipment provided by the above technical solution can realize automatic operation and automatic switching of pump operation through local control circuits and remote control circuits, and automatically increase or decrease the number of pump operations according to the water level, thereby reducing power consumption. Control and switching of pump operation do not require manual intervention, thereby reducing labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0021] Figure 1 A control schematic diagram of an automatic circulating water pump control system for cooling lithium iron phosphate equipment provided by at least one embodiment of the present application;

[0022] Figure 2 It is the main circuit control principle diagram of the existing hot water pump control system;

[0023] Figure 3 A PLC system control wiring diagram of an automatic circulating water pump control system for cooling lithium iron phosphate equipment provided in at least one embodiment of the present application. DETAILED DESCRIPTION

[0024] The following is a description of the implementation of the present application by specific specific embodiments. People familiar with the technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0025] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "set", "install", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0027] The present application embodiment provides an automatic circulating water pump control system for cooling lithium iron phosphate equipment, referring to Figure 1 , including: local remote switching button, local control circuit, remote control circuit, main pump delay timing circuit, self-priming pump protection time circuit, liquid level relay circuit, main pump delay start circuit, self-priming pump operation circuit.

[0028] refer to Figure 2 The existing hot water pump control cabinet has the following problems: the water pump control cabinet only has the star-delta starting function of the motor, and the control is relatively simple; the number of pumps in operation cannot be automatically increased or decreased according to the water level during operation, resulting in increased energy consumption; long-term operation of the same pump causes serious mechanical wear and increases the risk of mechanical fatigue of the equipment; controlling and switching the pump operation requires manual intervention, which increases the labor intensity of employees.

[0029] Therefore, the automatic circulating water pump control system for cooling lithium iron phosphate equipment provided in the embodiment of the present application adopts Siemens PLC for the entire control, adds a float liquid level switch to automatically detect the liquid level, and controls the number of pumps according to the float liquid level, thereby reducing power consumption. The operation logic of the automatic switching pump is written in the internal program of the PLC, and multiple pumps are switched according to the operating time, so that the entire water pump system can achieve balanced and stable operation.

[0030] In some embodiments, the input end of the local remote switch button is connected to the live wire, and the two output ends are connected to the local control circuit and the remote control circuit respectively.

[0031] In some embodiments, the local control circuit includes a limit switch SQ1, a normally closed button switch SB1, a normally open button switch SB2, and an intermediate relay KA1. The first end of the limit switch SQ1 is connected to an output terminal of a local remote switching button, the second end of the limit switch SQ1 is connected to the first end of the normally closed button switch SB1, the second end of the normally closed button switch SB1 is connected to the first end of the normally open button switch SB2, the second end of the normally open button switch SB2 is connected to the first end of the intermediate relay KA1 coil, the second end of the intermediate relay KA1 coil is connected to the neutral line, and the first end and the second end of the normally open button switch SB2 are respectively connected to the first end and the second end of the normally open button switch SB2.

[0032] In some embodiments, the remote control circuit includes a limit switch SQ2, a normally closed button switch SB3, a normally open button switch SB4, an intermediate relay KA2, and an intermediate relay KA10. The first end of the limit switch SQ2 is connected to the other output end of the local remote switching button, the second end of the limit switch SQ2 is connected to the first end of the normally closed button switch SB3, the second end of the normally closed button switch SB3 is connected to the first end of the normally open button switch SB4, the second end of the normally open button switch SB4 is connected to the first end of the intermediate relay KA2 coil, the second end of the intermediate relay KA2 coil is connected to the neutral line, the first end and the second end of the intermediate relay KA2 normally closed contact are respectively connected to the first end and the second end of the normally open button switch SB4, the first end of the intermediate relay KA10 normally closed contact is connected to the first end of the limit switch SQ2, the second end of the intermediate relay KA10 normally closed contact is connected to the first end of the intermediate relay KA2 coil, and the intermediate relay KA10 coil is controlled by the PLC system.

[0033] In some embodiments, the main pump delay timing circuit includes a time relay KT1, a first end of a coil of which is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to the neutral line.

[0034] In some embodiments, the self-priming pump protection time circuit includes a time relay KT2, a first end of a coil of which is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to the neutral line.

[0035] In some embodiments, the liquid level relay circuit includes a liquid level meter KL1, a first end of a coil of which is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to a neutral line.

[0036] In some embodiments, it also includes: a return valve control circuit, including an intermediate relay KA3, a first end of its coil is connected to the second end of the moving contacts of the intermediate relays KA1 and KA2, and a second end of its coil is connected to the neutral line.

[0037] In some embodiments, the main pump delayed start circuit includes an intermediate relay KA4, a liquid level meter KL1, a thermal relay FR1, a time relay KT1, and an intermediate relay KA4. The first end of the normally closed contact of the intermediate relay KA4 is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and the second end of the normally closed contact is connected to the first end of the normally broken contact of the thermal relay FR1. The first end and the second end of the normally closed contact of the liquid level meter KL1 are respectively connected to the first end and the second end of the normally closed contact of the intermediate relay KA4. The second end of the normally broken contact of the thermal relay FR1 is connected to the first end of the normally closed contact of the time relay KT1. The second end of the normally closed contact of the time relay KT1 is connected to the first end of the coil of the intermediate relay KA4, and the second end of the coil of the intermediate relay KA4 is connected to the neutral line.

[0038] In some embodiments, the self-priming pump operation circuit includes a liquid level meter KL1, a thermal relay FR2, a time relay KT2, and an intermediate relay KA4. The first end of the moving-break contact of the liquid level meter KL1 is connected to the second end of the making contacts of the intermediate relays KA1 and KA2, and the second end of its moving-break contact is connected to the first end of the moving-break contact of the thermal relay FR2, the second end of the moving-break contact of the thermal relay FR2 is connected to the first end of the moving-break contact of the time relay KT2, the second end of the moving-break contact of the time relay KT2 is connected to the first end of the moving-break contact of the intermediate relay KA4, the second end of the moving-break contact of the intermediate relay KA4 is connected to the first end of the coil of the contactor KM4, and the second end of the coil of the contactor KM4 is connected to the neutral line.

[0039] In some embodiments, it also includes: a self-priming pump operation indication circuit, including an indicator light HL3, and two ends of the indicator light HL3 are respectively connected to the first end and the second end of the contactor KM4 coil.

[0040] In some embodiments, it also includes: a parking return air valve circuit, including an intermediate relay KA3 and a solenoid valve YV1, wherein the first end of the moving-break contact of the intermediate relay KA3 is connected to the live wire, the second end of the moving-break contact is connected to the first end of the solenoid valve YV1, and the second end of the solenoid valve YV1 is connected to the neutral wire.

[0041] In some embodiments, it also includes: a self-priming pump switching circuit, including a contactor KM4 and a solenoid valve YVM, wherein the first end of the normally closed contact of the contactor KM4 is connected to the live wire, the second end of the normally closed contact is connected to the first end of the solenoid valve YVM, the second end of the solenoid valve YVM is connected to the neutral wire, and the two ends of the normally closed contact of the contactor KM4 are respectively connected to the first end and the second end of the normally closed contact of the contactor KM4.

[0042] Specifically, when the switch button is switched to local control, the start button is pressed, and the intermediate relay KA1 is energized and remains self-locked. Since the KA1 coil is energized, the KA1 moving contact is actuated to close the self-priming pump AC contactor KM4 (the self-priming pump is running, and the HL3 indicator light is on). During the operation of the self-priming pump, if the liquid level gauge KL1 contact senses the water level signal, the self-priming pump stops running, and the main pump control circuit intermediate relay KA4 is energized to operate in a star-delta circuit. During the operation of the self-priming pump, the time relay KT1 / KT2 is energized to start delay timing. If the KL1 contact does not sense the water level signal within the set time, the self-priming pump stops running, and the main pump can also start after the delay time.

[0043] The system is automatically controlled by adding KA10 intermediate relay contacts. The KA10 relay coil is controlled by the PLC system. In some embodiments, this control system is controlled by Siemens 200SMART. The control wiring diagram is shown in Figure 1. Figure 3 shown.

[0044] refer to Figure 3 The input signals collected by the entire control system include the liquid level meter signal and the overload signals of six water pumps. The output controls the remote automatic control signals of each control cabinet to achieve automatic control of the start and stop of the six pumps by the system, making the entire control system simple, stable and reliable.

[0045] The system switches multiple circulating pumps by reading the day of the week and time of the system clock. For example, in the first week, pumps 1, 2, and 3 are the main pumps, and pumps 4, 5, and 6 are the standby pumps. When the level gauge signal senses an input (the water level continues to rise), pumps 4, 5, and 6 are delayed to start within a 20-minute interval according to the timing time. If pump 4 fails and the water level continues to rise, pump 5 is started to ensure that the water level is within a controllable range. When the number of pumps in operation increases, the liquid level will inevitably drop. At this time, there is no input signal from the level gauge signal, and the system starts to stop pumps 4, 5, and 6 in sequence, achieving a first-start-first-stop control.

[0046] In some embodiments, the number of pumps put into operation is increased or decreased according to the float liquid level signal in the entire control system, and the switching between pumps is performed in sequence every Monday through the system clock logic, ensuring the effective and reasonable use of the motor and energy consumption by the entire control system. During the entire control process, even if a failure occurs in the operation of the main pump, the operation of the pump can be increased or decreased according to the float switch signal, and the water level in the reservoir will be prevented from overflowing.

[0047] In summary, compared with the prior art, the automatic circulating water pump control system for cooling lithium iron phosphate equipment provided by the above technical solution can realize automatic operation and automatic switching of pump operation through local control circuits and remote control circuits, and automatically increase or decrease the number of pump operations according to the water level, thereby reducing power consumption. The control and switching of pump operation do not require manual intervention, thereby reducing the labor intensity of personnel.

[0048] Note that, unless otherwise directly stated, all features disclosed in this specification (including any attached claims, abstracts and drawings) may be replaced by alternative features for achieving the same, equivalent or similar purposes. Therefore, unless otherwise explicitly stated, each feature disclosed is only an example of a group of equivalent or similar features. Where used, further, preferably, further and more preferably are simple beginnings for elaborating another embodiment based on the aforementioned embodiment, and the content of further, preferably, further or more preferably followed by the aforementioned embodiment is combined with the complete composition of another embodiment. Several further, preferably, further or more preferably settings following the same embodiment can be arbitrarily combined to form another embodiment.

[0049] In the implementation of functions and steps, the corresponding functions and steps in various embodiments may also occur in a different order than shown. For example, two consecutive functions and steps may actually be performed or implemented substantially in parallel, and they may sometimes be performed or implemented in the opposite order, depending on the functions involved.

[0050] Although the present application has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made to the present application. Therefore, these modifications or improvements made without departing from the spirit of the present application all fall within the scope of protection claimed in the present application.

Claims

1. An automatic circulating water pump control system for cooling lithium iron phosphate equipment, characterized in that: include: Local remote switching button, local control circuit, remote control circuit, main pump delay timing circuit, self-priming pump protection time circuit, liquid level relay circuit, main pump delay start circuit, self-priming pump operation circuit, among which, The incoming end of the local remote switching button is connected to the live wire, and the two outgoing ends are connected to the local control circuit and the remote control circuit respectively; The local control circuit includes a limit switch SQ1, a normally closed button switch SB1, a normally open button switch SB2, and an intermediate relay KA1, wherein a first end of the limit switch SQ1 is connected to an output terminal of a local remote switching button, a second end of the limit switch SQ1 is connected to a first end of the normally closed button switch SB1, a second end of the normally closed button switch SB1 is connected to a first end of the normally open button switch SB2, a second end of the normally open button switch SB2 is connected to a first end of the coil of the intermediate relay KA1, a second end of the coil of the intermediate relay KA1 is connected to a neutral line, and a first end and a second end of a moving contact of the intermediate relay KA1 are connected to a first end and a second end of the normally open button switch SB2, respectively; The remote control circuit includes a limit switch SQ2, a normally closed button switch SB3, a normally open button switch SB4, an intermediate relay KA2, and an intermediate relay KA10. The first end of the limit switch SQ2 is connected to the other output end of the local remote switching button, the second end of the limit switch SQ2 is connected to the first end of the normally closed button switch SB3, the second end of the normally closed button switch SB3 is connected to the first end of the normally open button switch SB4, the second end of the normally open button switch SB4 is connected to the first end of the intermediate relay KA2 coil, the second end of the intermediate relay KA2 coil is connected to the neutral line, the first end and the second end of the intermediate relay KA2 moving contact are respectively connected to the first end and the second end of the normally open button switch SB4, the first end of the intermediate relay KA10 moving contact is connected to the first end of the limit switch SQ2, the second end of the intermediate relay KA10 moving contact is connected to the first end of the intermediate relay KA2 coil, and the intermediate relay KA10 coil is controlled by the PLC system.

2. The automatic circulating water pump control system for cooling lithium iron phosphate equipment according to claim 1, characterized in that: The main pump delay timing circuit comprises a time relay KT1, a first end of a coil of which is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to the neutral line.

3. The automatic circulating water pump control system for cooling lithium iron phosphate equipment according to claim 2, characterized in that: The self-priming pump protection time circuit comprises a time relay KT2, a first end of a coil of which is connected to the second ends of the moving contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to the neutral line.

4. The automatic circulating water pump control system for cooling lithium iron phosphate equipment according to claim 1, characterized in that: The liquid level relay circuit comprises a liquid level meter KL1, a first end of a coil of which is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to a neutral line.

5. The automatic circulating water pump control system for cooling lithium iron phosphate equipment according to claim 1, characterized in that: Also includes: The air return valve control circuit comprises an intermediate relay KA3, a first end of a coil of which is connected to the second end of the movable contacts of the intermediate relays KA1 and KA2, and a second end of the coil of which is connected to the neutral line.

6. The automatic circulating water pump control system for cooling lithium iron phosphate equipment according to claim 3, characterized in that: The main pump delayed start circuit includes an intermediate relay KA4, a liquid level meter KL1, a thermal relay FR1, a time relay KT1, and an intermediate relay KA4. The first end of the normally closed contact of the intermediate relay KA4 is connected to the second end of the normally closed contacts of the intermediate relays KA1 and KA2, and the second end of the normally closed contact is connected to the first end of the normally broken contact of the thermal relay FR1. The first end and the second end of the normally closed contact of the liquid level meter KL1 are respectively connected to the first end and the second end of the normally closed contact of the intermediate relay KA4. The second end of the normally broken contact of the thermal relay FR1 is connected to the first end of the normally closed contact of the time relay KT1. The second end of the normally closed contact of the time relay KT1 is connected to the first end of the coil of the intermediate relay KA4, and the second end of the coil of the intermediate relay KA4 is connected to the neutral line.

7. The automatic circulating water pump control system for cooling lithium iron phosphate equipment according to claim 6, characterized in that: The self-priming pump operation circuit includes a liquid level meter KL1, a thermal relay FR2, a time relay KT2, and an intermediate relay KA4. The first end of the moving-break contact of the liquid level meter KL1 is connected to the second end of the moving-make contacts of the intermediate relays KA1 and KA2, the second end of its moving-break contact is connected to the first end of the moving-break contact of the thermal relay FR2, the second end of the moving-break contact of the thermal relay FR2 is connected to the first end of the moving-break contact of the time relay KT2, the second end of the moving-break contact of the time relay KT2 is connected to the first end of the moving-break contact of the intermediate relay KA4, the second end of the moving-break contact of the intermediate relay KA4 is connected to the first end of the coil of the contactor KM4, and the second end of the coil of the contactor KM4 is connected to the neutral line.

8. The automatic circulating water pump control system for cooling lithium iron phosphate equipment according to claim 7, characterized in that: Also includes: The self-priming pump operation indicating circuit comprises an indicating light HL3, and two ends of the indicating light HL3 are respectively connected to the first end and the second end of the coil of the contactor KM4.

9. The automatic circulating water pump control system for cooling lithium iron phosphate equipment according to claim 5, characterized in that: Also includes: The parking air return valve circuit includes an intermediate relay KA3 and a solenoid valve YV1. The first end of the break contact of the intermediate relay KA3 is connected to the live wire, the second end of the break contact is connected to the first end of the solenoid valve YV1, and the second end of the solenoid valve YV1 is connected to the neutral wire.

10. The automatic circulating water pump control system for cooling lithium iron phosphate equipment according to claim 8, characterized in that: Also includes: The self-priming pump switch circuit includes a contactor KM4 and a solenoid valve YVM. The first end of the make contact of the contactor KM4 is connected to the live wire, the second end of the make contact is connected to the first end of the solenoid valve YVM, the second end of the solenoid valve YVM is connected to the neutral wire, and the two ends of the break contact of the contactor KM4 are respectively connected to the first end and the second end of the make contact of the contactor KM4.

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