Maintenance device for wet-winding motor main pump and its usage method

Abstract

The present invention discloses a maintenance device for a wet-winding motor main pump and its usage method, which belongs to the technical field of nuclear power engineering. The maintenance device for the wet-winding motor main pump includes a solution preparation tank, a maintenance reagent storage tank, a circulation pipeline, an infusion pipeline, and a monitoring pipeline. The solution preparation tank is provided with a first liquid inlet, a second liquid inlet, a circulation liquid outlet, and a circulation liquid return port; the maintenance reagent storage tank can be communicated with the second liquid inlet; one end of the circulation pipeline is communicated with the circulation liquid outlet, and the other end can be communicated with the circulation liquid return port. A centrifugal pump and a first monitor are connected to the circulation pipeline; the infusion pipeline is connected to the circulation pipeline and can inject the liquid in the solution preparation tank into the wet-winding motor main pump from the liquid injection port at the bottom of the wet-winding motor main pump; the monitoring pipeline can be communicated with the liquid discharge port at the top of the wet-winding motor main pump, and a second monitor is connected to the monitoring pipeline. The present invention can automatically inject a uniform maintenance solution into the wet-winding motor main pump.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power engineering, and particularly relates to a maintenance device for a wet-winding motor main pump and a method for using the same. Background Art

[0002] After the wet-winding motor main pump is installed and positioned on site, the reactor coolant system of one loop where it is located is in an open state. If the stator core of the wet-winding motor main pump is directly exposed to the air, an oxidation-reduction reaction will occur and rust will form, which will pose a great threat to the safe and stable operation of the equipment after the system is directly put into operation. Therefore, wet maintenance must be carried out on the wet-winding motor main pump.

[0003] Wet maintenance means injecting a maintenance solution with a pH value of 10 ± 0.5 into the wet-winding motor main pump. In the prior art, generally, an operator injects the manually prepared maintenance solution into the wet-winding motor main pump.

[0004] Manually preparing the maintenance solution is time-consuming and laborious, and it may cause the components of the maintenance solution not to be stirred evenly, resulting in an unqualified maintenance solution being used to maintain the wet-winding motor main pump, which affects the normal use of the wet-winding motor main pump. Summary of the Invention

[0005] The purpose of the present invention is to provide a maintenance device for a wet-winding motor main pump and a method for using the same, which can automatically inject a uniform maintenance solution into the wet-winding motor main pump.

[0006] With the above concept, the technical solution adopted by the present invention is as follows:

[0007] A maintenance device for a wet-winding motor main pump, comprising:

[0008] A solution preparation tank, which is provided with a first liquid inlet, a second liquid inlet, a circulating liquid outlet, and a circulating liquid return port;

[0009] A maintenance reagent storage tank, which is configured to store the maintenance reagent with the original concentration, and the maintenance reagent storage tank can be communicated with the second liquid inlet;

[0010] A circulating pipeline, one end of which is communicated with the circulating liquid outlet, and the other end can be communicated with the circulating liquid return port. A centrifugal pump and a first monitor are connected to the circulating pipeline, and the first monitor can monitor the pH value of the liquid in the circulating pipeline;

[0011] An infusion pipeline, which is connected to the circulating pipeline and can inject the liquid in the solution preparation tank into the wet-winding motor main pump from the liquid injection port at the bottom of the wet-winding motor main pump;

[0012] A monitoring pipeline, which can communicate with the liquid discharge port at the top of the main pump of the wet-winding motor. A second monitor is connected to the monitoring pipeline, and the second monitor is used to monitor the pH value of the liquid in the monitoring pipeline.

[0013] Optionally, a first regulating valve is also connected to the monitoring pipeline. The first regulating valve can control the opening and closing of the monitoring pipeline, and the outlet end of the monitoring pipeline communicates with the solution preparation tank.

[0014] Optionally, a filter screen is also provided on the infusion pipeline.

[0015] Optionally, along the liquid flow direction in the infusion pipeline, a motor water injection regulating valve and a motor water injection stop valve are sequentially arranged on the infusion pipeline.

[0016] Optionally, a first liquid collection and recovery pipeline is connected to the infusion pipeline, and a motor drain regulating valve is arranged on the first liquid collection and recovery pipeline.

[0017] Optionally, along the liquid flow direction in the circulation pipeline and downstream of the centrifugal pump, a circulation regulating valve and a circulation stop valve are sequentially arranged on the circulation pipeline.

[0018] Optionally, a flow meter is arranged on the circulation pipeline between the circulation regulating valve and the circulation stop valve.

[0019] Optionally, a second liquid collection and recovery pipeline is connected to the circulation pipeline upstream of the circulation regulating valve, and a return drain regulating valve is arranged on the second liquid collection and recovery pipeline.

[0020] Optionally, the maintenance reagent storage tank and the second liquid inlet are communicated through a first connecting pipeline, and a plunger pump and a second regulating valve are arranged on the first connecting pipeline.

[0021] A usage method of a maintenance device for a main pump of a wet-winding motor. Using the above-mentioned maintenance device for the main pump of a wet-winding motor to inject a maintenance solution into the main pump of a wet-winding motor, including the following steps:

[0022] S1. Control the circulation pipeline, the infusion pipeline, and the monitoring pipeline to be in a closed state;

[0023] S2. Inject a set amount of original Grade A water into the solution preparation tank;

[0024] S3. Control the maintenance reagent storage tank to continuously inject the maintenance reagent with the original concentration into the solution preparation tank;

[0025] S4. Control the opening of the circulation pipeline, and monitor the display value of the first monitor in real time. After the display value of the first monitor reaches the set range, control the maintenance reagent storage tank to stop injecting the original concentration maintenance reagent into the solution preparation tank.

[0026] S5. Control the opening of the infusion pipeline.

[0027] S6. Control the opening of the monitoring pipeline. After the second monitor displays a value, control the closing of the circulation pipeline and the infusion pipeline.

[0028] When the maintenance device for the wet-winding motor main pump proposed by the present invention is in use, first control the closing of the circulation pipeline, the infusion pipeline and the monitoring pipeline, then inject a set amount of original Class A water into the solution preparation tank, control the maintenance reagent storage tank to continuously inject the original concentration maintenance reagent into the solution preparation tank, and at the same time control the opening of the circulation pipeline, and monitor the display value of the first monitor in real time. After the display value of the first monitor reaches the set range, control the maintenance reagent storage tank to stop injecting the original concentration maintenance reagent into the solution preparation tank. Under the circulation action of the circulation pipeline, the original concentration maintenance reagent and the original Class A water are fully mixed and stored in the solution preparation tank. Subsequently, control the opening of the infusion pipeline. The infusion pipeline and the circulation pipeline work together to automatically inject the maintenance solution in the solution preparation tank into the wet-winding motor main pump, with simple and rapid operation; control the opening of the monitoring pipeline. After the second monitor displays a value, it indicates that the maintenance solution in the wet-winding motor main pump is full, and at this time, control the closing of the circulation pipeline and the infusion pipeline.

[0029] The usage method of the maintenance device for the wet-winding motor main pump proposed by the present invention uses the above-mentioned maintenance device for the wet-winding motor main pump to inject the maintenance solution into the wet-winding motor main pump, improving the pH accuracy of the adjusted maintenance reagent solution and the efficiency of the main pump motor maintenance work, and reducing the uncontrollable factors and difficulties in the process of manual motor maintenance. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0031] Figure 1 It is a schematic diagram of the maintenance device for the wet-winding motor main pump provided by the embodiment of the present invention.

[0032] In the figure:

[0033] 1. Solution preparation tank; 11. Circulation liquid outlet; 12. Circulation liquid return port;

[0034] 2. Maintenance reagent storage tank; 21. Plunger pump; 22. Second regulating valve;

[0035] 3. Circulation pipeline; 31. Centrifugal pump; 32. First monitor; 33. Circulation regulating valve; 34. Circulation stop valve; 35. Flowmeter; 36. Sampling regulating valve;

[0036] 4. Infusion pipeline; 41. Filter screen; 42. Motor water injection regulating valve; 43. Motor water injection stop valve;

[0037] 5. Monitoring pipeline; 51. Second monitor; 52. First regulating valve;

[0038] 6. First liquid collection and recovery pipeline; 61. Motor drain regulating valve;

[0039] 7. Second liquid collection and recovery pipeline; 71. Loop drain regulating valve;

[0040] 8. Liquid inlet pipeline; 81. Third regulating valve;

[0041] 9. Main pump for wet-winding motor. Detailed implementation manners

[0042] To make the technical problems solved by the present invention, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the present invention will be further described below with reference to the drawings and through specific implementation manners. It can be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Additionally, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings rather than all of them.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0045] This embodiment provides a maintenance device for a wet-winding motor main pump, which can automatically inject a maintenance solution into the wet-winding motor main pump and can ensure the uniformity of the maintenance solution.

[0046] See Figure 1 , in this embodiment, the maintenance device for the wet-winding motor main pump includes a solution preparation tank 1, a maintenance reagent storage tank 2, a circulation pipeline 3, an infusion pipeline 4, and a monitoring pipeline 5.

[0047] Among them, the solution preparation tank 1 is provided with a first liquid inlet, a second liquid inlet, a circulation liquid outlet 11, and a circulation liquid return port 12. Preferably, in this embodiment, the solution preparation tank 1 has a liquid level display function.

[0048] The maintenance reagent storage tank 2 is configured to store the maintenance reagent with the original concentration, and the maintenance reagent storage tank 2 can be communicated with the second liquid inlet.

[0049] One end of the circulation pipeline 3 is communicated with the circulation liquid outlet 11, and the other end can be communicated with the circulation liquid return port 12. A centrifugal pump 31 and a first monitor 32 are connected to the circulation pipeline 3, and the first monitor 32 can monitor the pH value of the liquid in the circulation pipeline 3.

[0050] The infusion pipeline 4 is connected to the circulation pipeline 3 and can inject the liquid in the solution preparation tank 1 into the wet-winding motor main pump 9 through the liquid injection port at the bottom of the wet-winding motor main pump 9.

[0051] The monitoring pipeline 5 can be communicated with the liquid discharge port at the top of the wet-winding motor main pump 9. A second monitor 51 is connected to the monitoring pipeline 5, and the second monitor 51 is used to monitor the pH value of the liquid on the monitoring pipeline 5.

[0052] When the maintenance device of the wet-winding motor main pump proposed in this embodiment is in use, first control the circulation pipeline 3, the infusion pipeline 4, and the monitoring pipeline 5 to be closed. Then, inject a set amount of original Class A water into the solution preparation tank 1, control the maintenance reagent storage tank 2 to continuously inject the original-concentration maintenance reagent into the solution preparation tank 1, and at the same time control the circulation pipeline 3 to be opened. Real-time monitor the display value of the first monitor 32. When the display value of the first monitor 32 reaches the set range, control the maintenance reagent storage tank 2 to stop injecting the original-concentration maintenance reagent into the solution preparation tank 1. Under the circulation effect of the circulation pipeline 3, the original-concentration maintenance reagent and the original Class A water are fully mixed and stored in the solution preparation tank 1. Subsequently, control the infusion pipeline 4 to be opened. The infusion pipeline 4 and the circulation pipeline 3 work together to automatically inject the maintenance solution in the solution preparation tank 1 into the wet-winding motor main pump 9, with simple and rapid operation. Control the monitoring pipeline 5 to be opened. When the second monitor 51 shows a value, it means that the maintenance solution in the wet-winding motor main pump 9 is full. At this time, control the circulation pipeline 3 and the infusion pipeline 4 to be closed.

[0053] Further, in this embodiment, an inlet pipeline 8 is also connected to the first liquid inlet. A third regulating valve 81 is provided on the inlet pipeline 8. When injecting the original Class A water into the solution preparation tank 1, open the third regulating valve 81, and inject the original Class A water from the power plant demineralized water distribution system into the solution preparation tank 1 through the inlet pipeline 8. The third regulating valve 81 can control the injection amount when the inlet pipeline 8 injects the original Class A water into the solution preparation tank 1.

[0054] Further, the maintenance reagent storage tank 2 and the second liquid inlet are connected through a first connecting pipeline. A plunger pump 21 and a second regulating valve 22 are provided on the first connecting pipeline. The plunger pump 21 and the second regulating valve 22 are opened simultaneously, so that the maintenance reagent storage tank 2 can inject the original-concentration maintenance reagent into the solution preparation tank 1. The plunger pump 21 can provide sufficient pressure for the original-concentration maintenance reagent in the maintenance reagent storage tank 2 to be injected into the solution preparation tank 1.

[0055] Specifically, in this embodiment, the pH value of the original-concentration maintenance reagent is 13.

[0056] Further, in this embodiment, along the liquid flow direction in the circulation pipeline 3, downstream of the centrifugal pump 31, a circulation regulating valve 33 and a circulation stop valve 34 are successively arranged on the circulation pipeline 3. The circulation stop valve 34 can control the liquid flow direction in the circulation pipeline 3. The circulation regulating valve 33 can control the liquid flow rate in the circulation pipeline 3.

[0057] A flow meter 35 is arranged on the circulation pipeline 3 between the circulation regulating valve 33 and the circulation stop valve 34. The flow meter 35 can display the liquid flow rate in the circulation pipeline 3 in real time.

[0058] Upstream of the circulation regulating valve 33 on the circulation pipeline 3, a second liquid collecting and recycling pipeline 7 is connected. A loop drain regulating valve 71 is provided on the second liquid collecting and recycling pipeline 7. The loop drain regulating valve 71 can control the drain flow rate of the circulation pipeline 3.

[0059] A second connecting pipeline is connected between the first monitor 32 and the circulation pipeline 3. A sampling regulating valve 36 is provided on the second connecting pipeline. When it is necessary to monitor the pH value of the liquid in the circulation pipeline 3, the sampling regulating valve 36 is opened, so that the liquid in the circulation pipeline 3 flows through the second connecting pipeline to the first monitor 32.

[0060] In the circulation pipeline 3, the centrifugal pump 31 can provide sufficient pressure for the liquid circulation stirring in the circulation pipeline 3 and can provide sufficient pressure for the infusion pipeline 4 to ensure that the maintenance solution is injected into the wet-winding motor main pump 9.

[0061] Furthermore, in this embodiment, a filter screen 41 is also provided on the infusion pipeline 4 to prevent impurities from entering the wet-winding motor main pump 9.

[0062] Along the liquid flow direction in the infusion pipeline 4, a motor water injection regulating valve 42 and a motor water injection stop valve 43 are sequentially provided on the infusion pipeline 4. The motor water injection regulating valve 42 can regulate the solution flow rate into the wet-winding motor main pump 9. The motor water injection stop valve 43 can control the water injection flow rate and the drain flow rate of the wet-winding motor main pump 9.

[0063] A first liquid collecting and recycling pipeline 6 is connected to the infusion pipeline 4. A motor drain regulating valve 61 is provided on the first liquid collecting and recycling pipeline 6.

[0064] Furthermore, in this embodiment, a first regulating valve 52 is also connected to the monitoring pipeline 5. The first regulating valve 52 can control the opening and closing of the monitoring pipeline 5. The outlet end of the monitoring pipeline 5 is connected to the solution preparation tank 1 to avoid solution waste. Specifically, a main pump return port is also provided on the solution preparation tank 1. The outlet end of the monitoring pipeline 5 is connected to the main pump return port.

[0065] Specifically, in this embodiment, the first monitor 32 and the second monitor 51 are pH testers.

[0066] The maintenance device for the wet-winding motor main pump provided in this embodiment adopts the method of using the circulation pipeline 3 and the first monitor 32 to online monitor the pH value of the solution in the circulation pipeline 3. Compared with the ordinary method of manually preparing the maintenance reagent solution and then injecting it into the wet-winding motor main pump 9, it significantly improves the pH accuracy of the adjusted maintenance reagent solution and the efficiency of the main pump motor maintenance work, and reduces the uncontrollable factors and difficulties in the manual motor maintenance process.

[0067] A safety pressure barrier is formed through a closed-loop circuit. In case of abnormal pressure, the start and stop states of the maintenance circuit and the controllable cyclic adjustment of the pH value of the maintenance reagent solution can be achieved by the opening and closing of different valve components, resulting in a relatively high safety factor of the device.

[0068] By setting up the monitoring pipeline 5, the function of sampling and monitoring the pH value of the solution inside the main pump after the operation cycle or maintenance cycle of the main pump is realized, so as to judge whether it is necessary to replace the maintenance reagent solution and realize the function of online replacement.

[0069] This embodiment also provides a usage method of the maintenance device for the wet-winding motor main pump. The maintenance device for the wet-winding motor main pump as described above is used to inject the maintenance solution into the wet-winding motor main pump 9, including the following steps:

[0070] S1. Control the circulation pipeline 3, the infusion pipeline 4 and the monitoring pipeline 5 to be in the closed state.

[0071] Specifically, before step S1, check whether the states of all components of the maintenance device for the wet-winding motor main pump are normal. Before maintenance, the pipelines of the maintenance device can be cleaned with compressed air to ensure that the inside of the pipelines is clean, free of foreign objects. Connect the power supply line.

[0072] Specifically, in step S1, when controlling the circulation pipeline 3 to be in the closed state, control the centrifugal pump 31, the sampling regulating valve 36, the loop drain regulating valve 71, the circulation regulating valve 33 and the circulation stop valve 34 to be in the closed state. When controlling the infusion pipeline 4 to be in the closed state, control the motor water injection regulating valve 42 and the motor water injection stop valve 43 to be in the closed state. When controlling the monitoring pipeline 5 to be in the closed state, control the first regulating valve 52 to be closed.

[0073] S2. Inject a set amount of original Class A water into the solution preparation tank 1.

[0074] Specifically, in step S2, open the third regulating valve 81, inject about 2 m3 of original Class A water from the power plant demineralized water distribution system into the solution preparation tank 1, and close the third regulating valve 81.

[0075] S3. Control the maintenance reagent storage tank 2 to continuously inject the maintenance reagent with the original concentration into the solution preparation tank 1.

[0076] Specifically, in step S3, open the plunger pump 21, and adjust the injection amount of the maintenance reagent with the original concentration injected into the solution preparation tank 1 by adjusting the opening degree of the second regulating valve 22.

[0077] S4. Control the circulation pipeline 3 to be opened, and real-time monitor the display value of the first monitor 32. When the display value of the first monitor 32 reaches the set range, control the maintenance reagent storage tank 2 to stop injecting the maintenance reagent with the original concentration into the solution preparation tank 1.

[0078] Specifically, in step S4, it is confirmed that the motor water injection regulating valve 42, the first regulating valve 52, the motor drain regulating valve 61, the motor water injection stop valve 43, and the loop drain regulating valve 71 are all closed. At this time, the circulation pipeline 3 is in the internal circulation stirring state. The sampling regulating valve 36 is opened, and the display value of the first monitor 32 is monitored. In step S4, the opening degree of the second regulating valve 22 and the flow rate of the plunger pump 21 are adjusted until the display value of the first monitor 32 reaches the set range, and then the maintenance reagent storage tank 2 is controlled to stop injecting the original concentration maintenance reagent into the solution preparation tank 1. Specifically, the set range is 9.5 - 10.5. When the display value of the first monitor 32 reaches the set range, the maintenance reagent storage tank 2 is controlled to stop injecting the original concentration maintenance reagent into the solution preparation tank 1, the second regulating valve 22 and the plunger pump 21 are closed, and the circulation pipeline 3 continues to operate for a set time to ensure the uniformity of the solution.

[0079] S5. Control the infusion pipeline 4 to open.

[0080] Specifically, step S5 includes:

[0081] S51. Observe the flowmeter 35, and slowly adjust the opening degree of the circulation regulating valve 33 to make the flow rate in the circulation pipeline 3 stable at 40 L / min;

[0082] S52. Open the motor water injection regulating valve 42 and the motor water injection stop valve 43 in sequence, and close the circulation stop valve 34; at this time, the maintenance device of the wet-winding motor main pump injects the maintenance solution with the adjusted PH value into the wet-winding motor main pump 9.

[0083] S6. Control the monitoring pipeline 5 to open. When the second monitor 51 shows a value, control the circulation pipeline 3 and the infusion pipeline 4 to close.

[0084] Specifically, in step S6, open the first regulating valve 52 to open the monitoring pipeline 5. When the second monitor 51 shows a value and there is a stable water flow flowing out downstream of the first regulating valve 52, it indicates that the inside of the wet-winding motor main pump 9 is completely filled with the maintenance solution with the adjusted PH value.

[0085] S7. Close the centrifugal pump 31, the motor water injection stop valve 43, and the first regulating valve 52, and open the motor drain regulating valve 61 and the loop drain regulating valve to drain the excess liquid in the loop.

[0086] Furthermore, after the operation or maintenance cycle, the maintenance device of the wet-winding motor main pump can also sample and detect the PH value of the maintenance solution inside the wet-winding motor main pump 9.

[0087] Specifically, the steps for sampling and detecting the PH value of the maintenance solution inside the wet-winding motor main pump 9 are as follows:

[0088] S01. Perform steps S1 - S4 to configure a new maintenance solution.

[0089] S02. Observe the flowmeter 35 and slowly adjust the opening degree of the circulation regulating valve 33 to stabilize the flow rate in the circulation pipeline 3 at 40 L / min.

[0090] S03. Open the first regulating valve 52 and slowly open the motor water injection regulating valve 42 and the circulation stop valve 34.

[0091] S04. Open the motor water injection stop valve 43 and inject the newly configured maintenance solution into the wet - winding motor main pump 9. Since the wet - winding motor main pump 9 is already filled with the previously configured maintenance solution at this time, the medium will quickly flow into the solution preparation tank 1 in the monitoring pipeline 5.

[0092] S05. Observe the display value of the second monitor 51 and record the PH value of the initial discharge liquid inside the wet - winding motor main pump 9. It can be considered that this value is the PH value of the internal solution after the motor maintenance / operation cycle. Determine whether it is necessary to replace the internal maintenance liquid of the motor according to this value. If the PH value is less than 9.5, perform steps S1 - S7.

[0093] The usage method of the maintenance device for the wet - winding motor main pump provided in this embodiment, using the above - mentioned maintenance device for the wet - winding motor main pump, can inject a maintenance solution with a PH value of 10 ± 0.5 into the wet - winding motor main pump 9. By adopting the method of using the circulation pipeline 3 and the first monitor 32 to on - line monitor the PH value of the solution in the circulation pipeline 3, compared with the method of manually preparing the maintenance reagent solution and then injecting it into the wet - winding motor main pump 9, it significantly improves the PH accuracy of the adjusted maintenance reagent solution and the efficiency of the main pump motor maintenance work, and reduces the uncontrollable factors and difficulties in the process of manual motor maintenance.

[0094] The above - mentioned embodiments only illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above - mentioned embodiments. Without departing from the spirit and scope of the present invention, there are various changes and modifications to the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for using a maintenance device for a main pump of a wet-winding motor, characterized in that, The maintenance device for the wet-winding motor main pump includes: A solution preparation tank (1), which is provided with a first liquid inlet, a second liquid inlet, a circulating liquid outlet (11) and a circulating liquid return port (12); A maintenance reagent storage tank (2), configured to store the maintenance reagent with the original concentration, and the maintenance reagent storage tank (2) can communicate with the second liquid inlet; A circulation pipeline (3), one end of which is communicated with the circulating liquid outlet (11), and the other end can be communicated with the circulating liquid return port (12). A centrifugal pump (31) and a first monitor (32) are connected to the circulation pipeline (3), and the first monitor (32) can monitor the pH value of the liquid in the circulation pipeline (3); An infusion pipeline (4), connected to the circulation pipeline (3), and can inject the liquid in the solution preparation tank (1) into the wet-winding motor main pump (9) from the liquid injection port at the bottom of the wet-winding motor main pump (9); A monitoring pipeline (5), which can be communicated with the liquid discharge port at the top of the wet-winding motor main pump (9). A second monitor (51) is connected to the monitoring pipeline (5), and the second monitor (51) is used to monitor the pH value of the liquid on the monitoring pipeline (5); Injecting a maintenance solution into the wet-winding motor main pump (9) using the maintenance device for the wet-winding motor main pump includes the following steps: S1. Control the circulation pipeline (3), the infusion pipeline (4) and the monitoring pipeline (5) to be in a closed state; S2. Inject a set amount of original grade A water into the solution preparation tank (1); S3. Control the maintenance reagent storage tank (2) to continuously inject the maintenance reagent with the original concentration into the solution preparation tank (1); S4. Control the circulation pipeline (3) to be opened, and continuously monitor the displayed value of the first monitor (32). When the displayed value of the first monitor (32) reaches the set range, control the maintenance reagent storage tank (2) to stop injecting the maintenance reagent with the original concentration into the solution preparation tank (1); S5. Control the infusion pipeline (4) to be opened; S6. Control the monitoring pipeline (5) to be opened. When the second monitor (51) displays a value, control the circulation pipeline (3) and the infusion pipeline (4) to be closed.

2. The usage method of the maintenance device for the wet-winding motor main pump according to claim 1, characterized in that, A first regulating valve (52) is also connected to the monitoring pipeline (5), and the first regulating valve (52) can control the opening and closing of the monitoring pipeline (5). The outlet end of the monitoring pipeline (5) is communicated with the solution preparation tank (1).

3. The method of using the maintenance device for the wet-winding motor main pump according to claim 1, characterized in that, A filter screen (41) is also provided on the infusion pipeline (4).

4. The usage method of the maintenance device for the wet-winding motor main pump according to claim 1, wherein, Along the liquid flow direction in the infusion pipeline (4), a motor water injection regulating valve (42) and a motor water injection stop valve (43) are sequentially arranged on the infusion pipeline (4).

5. The method of using the maintenance device for the wet-winding motor main pump according to claim 1, characterized in that A first liquid collection and recovery pipeline (6) is connected to the infusion pipeline (4), and a motor drain regulating valve (61) is arranged on the first liquid collection and recovery pipeline (6).

6. The method for using the maintenance device of the wet-winding motor main pump according to claim 1, characterized in that, Along the liquid flow direction in the circulation pipeline (3), downstream of the centrifugal pump (31), a circulation regulating valve (33) and a circulation stop valve (34) are sequentially arranged on the circulation pipeline (3).

7. The method for using the maintenance device of the wet-winding motor main pump according to claim 6, characterized in that, A flowmeter (35) is provided on the circulation pipeline (3) between the circulation regulating valve (33) and the circulation stop valve (34).

8. The method for using the maintenance device of the wet-winding motor main pump according to claim 6, characterized in that A second liquid collection and recovery pipeline (7) is connected to the circulation pipeline (3) upstream of the circulation regulating valve (33), and a loop drain regulating valve (71) is provided on the second liquid collection and recovery pipeline (7).

9. The method of using the maintenance device for the wet-winding motor main pump according to any one of claims 1-8, characterized in that, The maintenance reagent storage tank (2) and the second liquid inlet are communicated through a first connecting pipeline, and a plunger pump (21) and a second regulating valve (22) are provided on the first connecting pipeline.

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