Motor water inflow restoration and protection method

Abstract

The embodiment of the invention provides a motor inflow water repairing and protecting method. The method comprises the steps that centrifugal negative pressure drainage, gradient drying and corrosive medium removing treatment are sequentially conducted on a water inflow motor; real-time humidity data of a motor are collected, and an active dehumidification module is triggered according to the real-time humidity data; wherein the active dehumidification module comprises an electrothermal film and a miniature vacuum pump; a motor composite protection material system is constructed, and the motor composite protection material system comprises a fluororubber-graphene sealing layer on the surface of a shell and a nano ceramic membrane anti-corrosion layer on the surface of a stator winding. According to the embodiment of the invention, through multi-stage synergistic remediation, a single drying mode is broken through, and efficient removal of moisture is realized; a corrosion medium is subjected to targeted treatment, and an anti-corrosion mechanism is constructed; a humidity sensor and an active dehumidification module are integrated, traditional manual inspection is replaced, and the operation and maintenance efficiency is improved; the composite protective material is modified through graphene, so that the weather resistance and the sealing performance are remarkably improved, the reliability of the motor in a wading environment is remarkably improved, and the service life of the motor in the wading environment is remarkably prolonged.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of motor water ingress repair and protection, and particularly relate to a motor water ingress repair and protection method. Background Art

[0002] In humid or water-related working conditions, the motor often suffers from internal water ingress due to seal failure, causing winding short circuit, metal parts corrosion and other faults. The existing repair technologies have the following core

[0003] defect:

[0004] 1. Low and incomplete drying efficiency: Traditional methods rely on natural air drying or single oven heating (such as constant temperature drying at 100°C), which can only remove free surface water. They lack effective treatment for residual moisture (accounting for approximately 30%) within complex structures such as stator winding gaps and bearing cavities. As a result, the insulation resistance is generally less than 50MΩ, which is prone to leakage risks during operation.

[0005] 2. A single protection system: Physical isolation is achieved solely through the replacement of rubber seals (such as EPDM), without dynamic monitoring or active moisture protection mechanisms. In coastal high-humidity environments, seals have an average lifespan of only 3-4 years and are unable to withstand progressive corrosion from condensation, salt spray, and other sources.

[0006] 3. Lack of corrosion control: No treatment of chloride ions (Cl - ), dissolved oxygen (D O ) and other key corrosive media. Studies have shown that residual Cl - When the concentration is greater than 100 ppm, the corrosion rate of the motor's metal parts (such as end covers and shafts) can reach 60% within 3 months, significantly shortening the equipment life.

[0007] The essential defect of the existing technology is the lack of a systematic repair strategy of "drainage-drying-anti-corrosion" and an intelligent closed loop of "monitoring-response-protection". The repair is not thorough and the protection capability is insufficient, resulting in the reliability and durability of the repaired motor being difficult to meet the application requirements of high humidity and water-related scenarios. Summary of the Invention

[0008] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a method for repairing and protecting a motor from water ingress, comprising:

[0009] The water inlet motor is sequentially treated with centrifugal negative pressure drainage, gradient drying and corrosive medium removal;

[0010] Collecting real-time humidity data of the motor and triggering an active dehumidification module according to the real-time humidity data; wherein the active dehumidification module includes an electric heating film and a micro vacuum pump;

[0011] Construct a motor composite protective material system, including a fluororubber-graphene sealing layer on the casing surface and a nano-ceramic film anti-corrosion layer on the stator winding surface.

[0012] Furthermore, the centrifugal negative pressure drainage treatment of the water inlet motor includes:

[0013] Use a centrifugal drainage device to centrifuge the water inlet motor at a speed of 1500rpm to 2500rpm for 8min to 12min, and at the same time apply a negative pressure of -0.08MPa to -0.12MPa to absorb and drain the water.

[0014] Furthermore, the centrifugal drainage device includes a silicone sealing ring on the inner layer of the shell, a nano-hydrophobic coating on the outer layer of the shell, a rotor tapered spiral groove drainage channel, and a polytetrafluoroethylene filter screen on the end cover.

[0015] Furthermore, the step of performing gradient drying on the water-intake motor includes:

[0016] Use an infrared heat gun to dynamically adjust the hot air temperature and wind speed based on real-time feedback data from the embedded humidity sensor.

[0017] Furthermore, the method of dynamically adjusting the hot air temperature and wind speed according to the real-time feedback data of the embedded humidity sensor includes:

[0018] When the feedback humidity is greater than or equal to 10% RH, circulate and dry at a hot air temperature of 60°C and a wind speed of 3m / s;

[0019] When the feedback humidity is less than 10% RH and greater than or equal to 5% RH, dry at a low speed with a hot air temperature of 50°C and a wind speed of 2m / s;

[0020] When the feedback humidity is less than 5% RH and the insulation resistance is greater than 100 MΩ, stop drying.

[0021] Furthermore, the corrosive medium removal treatment of the water-intake motor includes:

[0022] Inject 0.08mol / L to 0.12mol / L sodium bicarbonate solution and let it stand for 30 minutes to remove chloride ions;

[0023] The sodium bicarbonate solution is discharged and nitrogen gas with a purity greater than or equal to 99.99% is introduced to remove oxygen.

[0024] Furthermore, the collecting of real-time humidity data of the motor and triggering of the active dehumidification module according to the real-time humidity data include:

[0025] Use flexible humidity sensors integrated into the water-prone areas of the motor to collect real-time humidity data;

[0026] When the fuzzy control algorithm is used to determine that the real-time humidity data is abnormal, the electric heating film is triggered to heat and dehumidify, and the micro vacuum pump is started to discharge water vapor.

[0027] Furthermore, when the fuzzy control algorithm is used to determine that the real-time humidity data is abnormal, the electric heating film is triggered to heat and dehumidify, and the micro vacuum pump is started to discharge water vapor, including:

[0028] When the real-time humidity data is greater than 65% RH and lasts for 15 minutes, the electric heating film is triggered to heat up to 40° C., and the micro vacuum pump is started to form a circulating dry air flow.

[0029] Furthermore, the fluororubber-graphene sealing layer has a thickness of 50 μm, wherein the graphene content is 5 wt % and is uniformly dispersed in the fluororubber matrix; and / or,

[0030] The main components of the nano ceramic film anti-corrosion layer are Al2O3 and SiO2, and the particle size is 50nm to 100nm.

[0031] Furthermore, the construction of the motor composite protective material system includes:

[0032] A fluororubber-graphene slurry is prepared by a solution blending method, and the fluororubber-graphene slurry is evenly coated on the motor housing by an electrostatic spraying method, and cured at 150° C. for 2 hours to form a 50 μm fluororubber-graphene sealing layer; and / or,

[0033] A nano-ceramic film is sprayed on the surface of the stator winding, and a nano-ceramic film anti-corrosion layer is formed by chemical vapor deposition.

[0034] A method for repairing and protecting a motor from water ingress in an embodiment of the present disclosure achieves efficient water removal by achieving a multi-stage coordinated repair process of "centrifugal drying-negative pressure adsorption-gradient drying," breaking through a single drying mode; targeted treatment of corrosive media to construct an anti-corrosion mechanism; integrated humidity sensors and active dehumidification modules to form a "monitoring-early warning-processing" closed loop, replacing traditional manual inspections and improving operation and maintenance efficiency; composite protective materials are modified with graphene to significantly improve weather resistance and sealing performance, thereby increasing the reliability and service life of motors in water-related environments, making the motor suitable for rapid repair and full-cycle protection in water-related scenarios such as industrial motors and automotive drive motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The present invention is a flowchart of a method for repairing and protecting a motor from water ingress according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0037] In addition, the described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, well-known methods, devices, implementations or operations are not shown or described in detail to avoid blurring various aspects of the present disclosure.

[0038] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0039] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Thus, the first component discussed below can be referred to as the second component without departing from the teachings of the concepts of this disclosure. As used in this disclosure, the term "and / or" includes any one of the associated listed items and all combinations of one or more of them.

[0040] Those skilled in the art will understand that the drawings are merely schematic diagrams of example embodiments, and the modules or processes in the drawings are not necessarily necessary for implementing the present disclosure, and therefore cannot be used to limit the scope of protection of the present disclosure.

[0041] like Figure 1 As shown, an embodiment of the present disclosure provides a method for repairing and protecting a motor from water ingress, comprising:

[0042] M1. The water inlet motor is subjected to centrifugal negative pressure drainage, gradient drying and corrosive medium removal treatments in sequence.

[0043] Specifically, this embodiment proposes a multi-stage coordinated repair process for water-intake motors. To address the problems of incomplete drying, limited protection, and high corrosion risk in existing repair technologies, a three-stage coordinated repair process of "drainage-drying-anti-corrosion" is proposed.

[0044] Stage 1: Centrifugal negative pressure drainage

[0045] The custom-made centrifugal drainage device has a motor main shaft and a centrifugal rotor assembly connected by an interference fit. The rotor surface is provided with a tapered spiral groove drainage channel structure (the drainage channel has a diameter of 5mm and an inclination angle of 30° to optimize diversion). The outer side is wrapped with a double-layer sealed shell, which includes an inner silicone sealing ring and an outer nano-hydrophobic coating. When working, the motor is centrifuged at a speed of 1500rpm to 2500rpm for 8min to 12min. The centrifugal force (about 400g) is used to throw the free water in the motor cavity to the inner wall of the centrifugal drainage device shell and discharge it through the tapered spiral groove drainage channel. The negative pressure adsorption port (pressure -0.08MPa to -0.12MPa) is opened simultaneously to remove residual water in complex structures such as the motor winding ends and the gaps in the junction box through the Bernoulli effect. The residual water stains are absorbed by the polytetrafluoroethylene filter on the end cover. The drainage rate can reach 98.7%.

[0046] Stage 2: Humidity feedback gradient drying

[0047] An embedded humidity sensor (accuracy ±2% RH) is used to provide real-time feedback of humidity data, and an infrared hot air gun (temperature adjustable from 50°C to 70°C, wind speed adjustable from 2m / s to 4m / s) is used to dynamically adjust the hot air temperature and wind speed based on the real-time feedback data from the embedded humidity sensor.

[0048] When the feedback humidity is ≥10% RH, the system initially circulates hot air at 60°C and 3 m / s. Humidity data is recorded every 10 minutes. When the internal humidity is detected to be <10% RH, the hot air temperature and wind speed are gradually reduced to 50°C and 2 m / s to prevent high-temperature damage to the polyester film insulation. Drying is stopped by turning off the infrared heat gun until the humidity is <5% RH and the insulation resistance is >100 MΩ (measured using a 500V megohmmeter with the test leads touching the winding and the housing). Compared to traditional oven methods, this method can shorten drying time by 2.5 hours and increase insulation resistance to over 100 MΩ.

[0049] Stage 3: Targeted removal of corrosive media

[0050] First, chemical treatment is performed. According to the volume of the motor cavity (such as 5L), a sodium bicarbonate solution with a pH value of 8.9 (such as 0.4L~0.6L) is injected, that is, a sodium bicarbonate solution with a pH value of 0.08mol / L~0.12mol / L is injected. HCO3 - With Cl - The ion pair effect reduces the activity of chloride ions. After standing for about 30 minutes, the Cl - The diffusion removal rate reaches 92%; then inert gas replacement is carried out, and nitrogen (purity ≥99.99%) is introduced after the sodium bicarbonate solution is discharged to replace the residual oxygen in the motor cavity (such as passing it at a flow rate of 20L / min for 5 minutes), and finally the oxygen content is reduced to <0.5%, thereby inhibiting electrochemical corrosion from the root.

[0051] The multi-stage, coordinated repair process achieves efficient moisture removal, with a residual rate of less than 0.3% as verified by Karl Fischer titration. This reduces drying time by 40% compared to traditional methods. The dual corrosion protection mechanism of "chemical neutralization + physical isolation" reduces secondary corrosion by 80% compared to existing technologies.

[0052] M2. Collect real-time humidity data of the motor and trigger the active dehumidification module according to the real-time humidity data.

[0053] Specifically, the active dehumidification module includes an electric heating film and a micro vacuum pump. The intelligent protection system is constructed as follows: (1) Sensing layer: Flexible humidity sensors (model HMI-200, accuracy ±2% RH, response time <10s) are integrated in water-prone areas such as motor end covers and junction boxes to collect real-time humidity data (resolution 0.1% RH); (2) Control layer: The on-board ECU (Electronic Control Unit) or the in-plant MES (Manufacturing Execution System) receives real-time humidity data via a LoRa wireless module or CAN bus, and uses a fuzzy control algorithm to determine abnormal conditions (such as real-time humidity data >65% RH and lasting for 15 minutes), triggering the built-in electric heating film (power 5W) in the motor cavity to heat and dehumidify, and starting a micro vacuum pump (displacement 0.3g / h) to discharge water vapor; (3) Execution layer: The electric heating film is heated to 40°C to desorb water vapor from the zeolite adsorbent, and at the same time, a circulating dry air flow is formed in conjunction with the micro vacuum pump, which can reduce the local humidity to below 50% RH within 20 minutes. The above-mentioned intelligent dynamic protection process forms an active dehumidification strategy, replacing traditional manual inspections and reducing the frequency of manual inspections from 5 times / month to 1 time / month. The operation and maintenance efficiency can be improved by 80%, and the probability of sudden failures can be reduced from 3% / year to below 0.5% / year.

[0054] M3. Build a composite motor protection material system.

[0055] Specifically, the motor composite protective material system includes a fluororubber-graphene sealing layer on the surface of the casing and a nano-ceramic film anti-corrosion layer on the surface of the stator winding.

[0056] (1) Sealing layer: A fluororubber-graphene composite coating (50 μm thick) was prepared by solution blending, with graphene sheets (5 wt%) uniformly dispersed in a fluororubber matrix. After pretreatment of the motor housing, the fluororubber-graphene slurry was evenly applied by electrostatic spraying and cured at 150°C for 2 hours to form a 50 μm thick coating. The cross-hatch test showed an adhesion of 8 MPa, and the salt spray test (5% NaCl solution spray) showed no corrosion after 1000 hours. This formed a dual structure of "physical barrier + conductive shielding", with a water pressure resistance of 2 MPa, far higher than the 0.6 MPa of traditional rubber, and a weathering life of over 10 years (tensile strength retention rate of 90% after 1000 hours of UV aging test), which is more than three times that of traditional rubber.

[0057] (2) Anti-corrosion layer: Spray nano-ceramic film (main components are Al2O3, SiO2, particle size 50nm ~ 100nm) on the surface of stator winding, and form a dense film layer through chemical vapor deposition. The water vapor permeability is reduced by 70% compared with traditional insulating paint, effectively blocking Cl - 、SO4 2- Penetration of corrosive ions.

[0058] The extension of the seal replacement cycle (from 3 years to 10 years) and the delay of metal component corrosion time (from 6 months to more than 24 months) can reduce the operation and maintenance costs of the entire life cycle by more than 60%.

[0059] It can be understood that there is no particular order among the above processes M1, M2, and M3.

[0060] A method for repairing and protecting a motor with water ingress according to an embodiment of the present disclosure achieves efficient water removal by achieving a breakthrough in a single drying mode through a multi-stage coordinated repair process of "centrifugal drying - negative pressure adsorption - gradient drying"; a sodium bicarbonate solution is introduced to neutralize chloride ions and nitrogen is used to replace dissolved oxygen, thereby performing targeted treatment on the corrosive medium and constructing a dual anti-corrosion mechanism of "chemical neutralization + physical isolation"; a humidity sensor and an active dehumidification module are integrated to form a "monitoring-early warning-processing" closed loop, replacing traditional manual inspections and improving operation and maintenance efficiency; the composite protective material is modified with graphene to significantly improve weather resistance and sealing performance, thereby increasing the reliability and service life of the motor in a water-related environment, making it suitable for rapid repair and full-cycle protection of water-related scenarios such as industrial motors and automotive drive motors.

[0061] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present disclosure, and the present disclosure is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present disclosure, and such modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A method for repairing and protecting a motor from water ingress, characterized in that: include: The water inlet motor is sequentially treated with centrifugal negative pressure drainage, gradient drying and corrosive medium removal; Collecting real-time humidity data of the motor and triggering an active dehumidification module according to the real-time humidity data; wherein the active dehumidification module includes an electric heating film and a micro vacuum pump; Construct a motor composite protective material system, including a fluororubber-graphene sealing layer on the casing surface and a nano-ceramic film anti-corrosion layer on the stator winding surface.

2. The method according to claim 1, characterized in that The centrifugal negative pressure drainage treatment of the water inlet motor includes: Use a centrifugal drainage device to centrifuge the water inlet motor at a speed of 1500rpm to 2500rpm for 8min to 12min, and at the same time apply a negative pressure of -0.08MPa to -0.12MPa to absorb and drain the water.

3. The method according to claim 2, characterized in that The centrifugal drainage device includes a silicone sealing ring on the inner layer of the shell, a nano-hydrophobic coating on the outer layer of the shell, a rotor tapered spiral groove drainage channel and a polytetrafluoroethylene filter screen on the end cover.

4. The method according to claim 1, wherein The step of performing gradient drying on the water-intake motor comprises: Use an infrared heat gun to dynamically adjust the hot air temperature and wind speed based on real-time feedback data from the embedded humidity sensor.

5. The method according to claim 4, characterized in that The method of dynamically adjusting the hot air temperature and wind speed according to the real-time feedback data of the embedded humidity sensor includes: When the feedback humidity is greater than or equal to 10% RH, circulate and dry at a hot air temperature of 60°C and a wind speed of 3m / s; When the feedback humidity is less than 10% RH and greater than or equal to 5% RH, dry at a low speed with a hot air temperature of 50°C and a wind speed of 2m / s; When the feedback humidity is less than 5% RH and the insulation resistance is greater than 100 MΩ, stop drying.

6. The method according to claim 1, characterized in that The corrosive medium removal treatment for the water-inlet motor includes: Inject 0.08mol / L to 0.12mol / L sodium bicarbonate solution and let it stand for 30 minutes to remove chloride ions; The sodium bicarbonate solution is discharged and nitrogen gas with a purity greater than or equal to 99.99% is introduced to remove oxygen.

7. The method according to claim 1, characterized in that The collecting of real-time humidity data of the motor and triggering of the active dehumidification module according to the real-time humidity data include: Use flexible humidity sensors integrated into the water-prone areas of the motor to collect real-time humidity data; When the fuzzy control algorithm is used to determine that the real-time humidity data is abnormal, the electric heating film is triggered to heat and dehumidify, and the micro vacuum pump is started to discharge water vapor.

8. The method according to claim 7, characterized in that When the fuzzy control algorithm is used to determine that the real-time humidity data is abnormal, the electric heating film is triggered to heat and dehumidify, and the micro vacuum pump is started to discharge water vapor, including: When the real-time humidity data is greater than 65% RH and lasts for 15 minutes, the electric heating film is triggered to heat up to 40° C., and the micro vacuum pump is started to form a circulating dry air flow.

9. The method according to claim 1, characterized in that The fluororubber-graphene sealing layer has a thickness of 50 μm, wherein the graphene content is 5 wt % and is uniformly dispersed in the fluororubber matrix; and / or, The main components of the nano ceramic film anti-corrosion layer are Al2O3 and SiO2, and the particle size is 50nm to 100nm.

10. The method according to claim 9, characterized in that The motor composite protective material system is constructed, including: A fluororubber-graphene slurry is prepared by a solution blending method, and the fluororubber-graphene slurry is evenly coated on the motor housing by an electrostatic spraying method, and cured at 150° C. for 2 hours to form a 50 μm fluororubber-graphene sealing layer; and / or, A nano-ceramic film is sprayed on the surface of the stator winding, and a nano-ceramic film anti-corrosion layer is formed by chemical vapor deposition.

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