Permanent magnet shield pump processing technology and permanent magnet shield pump

Abstract

The invention relates to the technical field of permanent magnet shield pumps, and particularly discloses a permanent magnet shield pump processing technology and a permanent magnet shield. The method comprises the following steps: S1, processing a permanent magnet shielding motor part, including stator processing, and sealing and forming a stator after the stator processing is completed; s2, the shield pump component is machined; step S3, processing the shielding case; s4, processing and shaping the shielding case by using a shaping assembly; and S5, assembling the processed permanent magnet shielding motor part, the processed shielding pump part and the processed shielding cover. According to the invention, the processing technology of the permanent-magnet shielding pump is optimized, and the effect of the permanent-magnet shielding pump is improved, especially the sealing forming of the stator and the processing shaping of the shielding cover.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet canned pumps, in particular to a permanent magnet canned pump processing technology and a permanent magnet canned pump. Background Art

[0002] The permanent magnet canned pump is a combination of a canned pump and a permanent magnet canned motor. A shielding cover is provided inside the permanent magnet canned pump, which serves to separate the transport medium and the permanent magnet canned motor.

[0003] The stators and rotors of the permanent magnet shielded motors currently in use all have shielding covers. If the shielding cover is too thick, it will increase the air gap of the motor and reduce the efficiency of the motor. If it is too thin, it is not easy to process. The market generally adopts 0.4mm-0.6mm thick plates for rolling and welding. In order to ensure its roundness in the stator cavity, it must be shaped. The existing shaping method is to install flanges at both ends of the stator with bolts, one end of the flange has an interface, and oil or water is injected into the stator shield cavity through the interface and pressurized for shaping. After the shaping is completed, the flanges at both ends are removed to drain the oil or water in the stator cavity. This method is cumbersome to operate, has low work efficiency, and is difficult to recover oil or water, pollutes the working environment, and increases production costs.

[0004] The heat generated by permanent magnet shielded motors during operation continues to increase, which can easily cause the permanent magnets to fail. The thermal cooling effect can be improved by improving the thermal conductivity of the potting material. However, the expansion coefficient of the potting material is too different from that of the electromagnetic wire material, which will cause the shielding sleeve to bulge, further leading to the rotor being stuck. In addition, the temperature difference between the working state and the non-working state of the motor varies greatly, and the potting material is prone to stress micro-cracks in a sealed environment.

[0005] Improper heat dissipation during use of permanent magnet shielded motors will increase the temperature of the motor and cause the permanent magnets to fail. The current heat dissipation method relies on the permanent magnet shielded motor's shell to exchange heat with water or air to transfer heat. Since permanent magnet shielded motors have high requirements for temperature rise, conventional autonomous cooling methods cannot meet their cooling effects. The high temperature rise causes the internal parts of permanent magnet shielded motors to age more easily, reducing the life of permanent magnet shielded motors. Existing technologies generally use forced means such as fan cooling or external circulating water for cooling, but the structure is complex, which increases the application cost. In addition, the sealing structure of the current permanent magnet shielded motor has poor sealing performance, especially at the cable outlet, which is prone to leakage. Summary of the invention

[0007] The invention provides a permanent magnet canned pump processing technology and a permanent magnet canned pump, which can overcome certain or some defects of the prior art.

[0008] A permanent magnet canned pump processing technology according to the present invention comprises the following steps: Step S1, processing permanent magnet shielded motor components, including stator processing, and then sealing and molding the stator after the stator processing is completed; Step S2, processing the canned motor pump components; Step S3, processing the shielding cover; Step S4, using a shaping component to process and shape the shielding cover; Step S5, assembling the processed permanent magnet shielded motor components, shielded pump components and shielding cover.

[0009] Through the present invention, the processing technology of the permanent magnet shielded pump is optimized, and the effect of the permanent magnet shielded motor is improved, especially in the sealing molding of the stator and the processing and shaping of the shielding cover.

[0010] Preferably, the stator seal forming in step S1 includes the following steps: Step S1.1, preheating treatment, cleaning the potting equipment and the cavity storing the stator, and after cleaning, preheating the potting equipment and the cavity storing the stator, the preheating temperature is 45-55°C; Step S1.2, preparation of potting material, weighing potting raw materials according to weight ratio, the potting raw materials including: filler, mixed curing agent, curing accelerator and bisphenol A epoxy resin, adding the mixed curing agent to the filler and stirring in one direction to obtain a mixture, adding bisphenol A epoxy resin to the obtained mixture at a temperature of 40-50° C., stirring for 5-20 minutes, and then adding the curing accelerator and stirring to obtain the potting material; Step S1.3, vacuum treatment, placing the stator in a cavity for storing the stator, and then using a vacuum pump to evacuate the processed stator and the cavity for storing the stator; Step S1.4, pouring process, when the vacuum pressure is below 500 Pa, pouring the potting material into the preheated stator to complete the pouring; Step S1.4, heat preservation and curing, the stator after vacuum casting is stored at a temperature of 100-150°C for 2-8 hours, wherein the curing temperature change rate is controlled at 3-5°C / h, and then the temperature is adjusted to a constant temperature of 25°C, and then cured for 8-15 hours.

[0011] Through the present invention, preheating treatment can reduce the temperature difference when the potting material contacts the stator, avoid stress concentration caused by the temperature difference, and improve the potting efficiency; the potting equipment and the cavity are cleaned to ensure the cleanliness of the stator potting environment and avoid pollution and the generation of bubbles; by accurately controlling the stirring time and temperature and preparing the potting material according to a specific weight ratio, the mixing effect is optimized and the uniformity and consistency of the potting material are ensured; vacuum treatment can effectively remove the space bubbles inside the potting material and the stator, ensure the stability of the potting quality, and improve the sealing; by controlling the curing temperature and time, it is ensured that the potting material can be fully cured to improve the final strength and durability, reduce internal stress, and prevent the stator from deforming or cracking.

[0012] Preferably, the potting material in step S1.2 comprises 100 parts of bisphenol A epoxy resin, 50-100 parts of mixed curing agent, 100-200 parts of filler, and 0.1-5 parts of curing accelerator by weight, wherein the mixed curing agent is composed of hyperbranched polyester (HBP-SA) and methyltetrahydrophthalic anhydride (MeTHPA).

[0013] Through the present invention, bisphenol A epoxy resin is used as a potting material, which has excellent chemical stability and mechanical properties, can better protect the stator and prevent damage caused by external environmental factors; by changing the ratio, the thermal conductivity of the potting material is improved, the thermal conductive cooling effect is improved, and at the same time, the expansion coefficient of the potting material is made close to the expansion coefficient of the electromagnetic wire material, thereby avoiding bulging of the shielding sleeve and preventing damage to the electromagnetic coil; at the same time, stress micro-cracks occurring in the potting material in a sealed environment can be restored to their original state through the improved self-coupling performance of the potting material, thereby increasing the reliability and service life of the product.

[0014] Preferably, the shaping component in step S4 includes a core shaft and a rubber sleeve, a hole is opened at one end of the core shaft to form an air inlet, a hole is opened on the side of the core shaft to form an air outlet, an air transmission channel connecting the air inlet and the air outlet is formed inside the core shaft, a limiting nut for fixing the position of the rubber sleeve is provided on the core shaft, and a locking nut for locking the limiting nut is also provided on the core shaft.

[0015] Through the present invention, the combination of the core shaft and the rubber sleeve can accurately control the shaping process of the shielding cover, ensuring that the size and shape of the shielding cover meet the design requirements; the air inlet at one end of the core shaft and the air outlet on the side are designed to effectively realize the entry and exit of airflow or liquid, thereby improving the entry and exit efficiency during the shaping process; the design of the limit nut makes it simple and quick to fix the rubber sleeve, and it can be adjusted as needed to ensure the correct position of the shaping component; the design of the locking nut ensures the stability of the limit nut during the shaping process, prevents position changes during operation, and improves the reliability of the shaping; precise fixation and shaping are achieved through a mechanical structure, thereby reducing errors that may be introduced by manual operation and improving the shaping quality of the shielding cover.

[0016] Preferably, both ends of the rubber sleeve are U-shaped, the rubber sleeve is sleeved on the outside of the core shaft, and a storage cavity for liquid injection and gas transmission is formed on the inside of the rubber sleeve and the outside of the core shaft.

[0017] Through the present invention, the tight fit between the rubber sleeve and the core shaft can effectively prevent the leakage of liquid or gas, improve the sealing performance, and ensure the sealing of the liquid injection and gas transmission process; the design of the storage cavity makes the injection and transmission of liquid or gas more convenient during the shaping process, which helps to improve production efficiency; the storage cavity also helps to evenly distribute pressure during the shaping process, so that the shaping of the shielding cover is more uniform, and the deformation or damage caused by uneven pressure is reduced; by providing uniform pressure and sealing conditions, the rubber sleeve helps to improve the size and shape consistency of the final shielding cover.

[0018] Preferably, the shielding cover shaping in step S4 includes the following steps: Step S4.1, first fill the rubber sleeve into the shielding cover, adjust the shielding cover and the rubber sleeve to fit together, and then tighten the limit nut and the locking nut; Step S4.2, adding high-pressure air into the storage chamber from the air inlet of the core shaft; Step S4.3, injecting pressurized liquid into the storage cavity from the air inlet of the core shaft, the pressurized liquid presses the rubber sleeve to form a seal between the inner side of the U-shaped ends of the rubber sleeve and the core shaft, and the shaping is completed; Step S4.4, after the shaping is completed, the pressure is released to release the pressurized liquid, and finally the rubber sleeve is pulled out of the shielding cover; Step S4.5, performing automated laser welding; Step S4.6, perform secondary bulging, and repeat steps S4.1-S4.4.

[0019] Through the present invention, secondary shaping is performed after welding to ensure the dimensional accuracy of the shielding cover, reduce the air gap of the motor, reduce the eddy current loss of the shielding cover, reduce the temperature rise of the motor, and thus improve the efficiency of the motor; the shaping method is simple to operate, has high working efficiency, and is simple to recover oil or water, will not pollute the working environment and the inner cavity of the shielding cover, and reduces the production cost.

[0020] A permanent magnet canned pump comprises a permanent magnet canned pump body, which is processed by using the above-mentioned permanent magnet canned pump processing technology.

[0021] Through the present invention, the permanent magnet shielded pump body processed by the above-mentioned permanent magnet shielded pump processing technology includes optimization of stator sealing molding and shielding cover shaping, which can significantly improve the performance of the permanent magnet shielded pump and meet the requirements of high performance and reliability.

[0022] Preferably, the permanent magnet shielded pump body includes a shielded pump and a permanent magnet shielded motor, a connecting piece for connecting the shielded pump and the permanent magnet shielded motor is provided between the shielded pump and the permanent magnet shielded motor, the shielded pump includes a pump cover, a base and a water pump casing, the water pump casing is a double-layer shell, the water pump casing includes a water pump outer cylinder and a water pump inner cylinder, a first cooling channel is formed between the water pump outer cylinder and the water pump inner cylinder, a second cooling channel is formed between the water pump inner cylinder and the permanent magnet shielded motor, and a water inlet and a water outlet are provided above the base.

[0023] Through the present invention, water flows from the water inlet into the second cooling channel, passes through the permanent magnet shielded motor and the shielded pump, and then turns at the pump cover and flows out to the water outlet through the first cooling channel. Taking the shielded pump with a rated flow rate of 42T as an example, its effective flow rate is 25T-55T, the outer diameter of the permanent magnet shielded motor is Φ138mm, and the inner diameter of the cooling channel is Φ165mm. When the minimum effective flow rate is 25T, 25 tons of water flow passes between the permanent magnet shielded motor and the cooling channel within 1 hour, and the flow rate is 51.2cm / s. When the rated flow rate is 42T, 42 tons of water flow passes between the permanent magnet shielded motor and the cooling channel within 1 hour, and the flow rate is 86cm / s, which can fully take away the heat generated by the permanent magnet shielded motor and improve the efficiency and life of the permanent magnet shielded motor.

[0024] Preferably, the permanent magnet shielded pump body also includes a motor housing and a cable, and the space between the motor housing and the cable is filled with potting glue and provided with a plurality of sealing rings.

[0025] Through the present invention, the sealing structure of the motor housing and the cable is optimized and designed, and a multi-level seal is formed by multiple sealing rings and potting glue. The waterproof level reaches IP68, and the whole machine can be immersed in water and run stably, realizing circulating water efficient water cooling, reducing the temperature rise of the permanent magnet shielded motor, and improving the efficiency of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the permanent magnet canned pump body; Figure 2 is a schematic diagram of the shaping device; Figure 3 Schematic diagram of permanent magnet shielded motor. DETAILED DESCRIPTION

[0027] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0028] Example 1 like Figure 1-3 As shown, this embodiment provides a permanent magnet canned pump processing process, which includes the following steps: Step S1, processing the components of the permanent magnet shielded motor 110, including processing the stator 210, and then sealing and molding the stator 210 after the processing of the stator 210 is completed; Step S2, processing the components of the canned motor pump 120; Step S3, processing the shielding cover 310; Step S4, using the shaping component 300 to process and shape the shielding cover 310; Step S5 , assembling the processed permanent magnet canned motor 110 components, canned pump 120 components and shielding cover 310 .

[0029] Through this embodiment, the processing technology of the permanent magnet canned motor 100 is optimized, and the effect of the components of the permanent magnet canned motor 110 is improved, especially in the sealing molding of the stator 210 and the processing and shaping of the shielding cover 310.

[0030] In this embodiment, the sealing and forming of the stator 210 in step S1 includes the following steps: Step S1.1, preheating treatment, cleaning the potting equipment and the cavity storing the stator 210, and after cleaning, preheating the potting equipment and the cavity storing the stator 210, the preheating temperature is 45-55°C; Step S1.2, preparation of potting material, weighing potting raw materials according to weight ratio, the potting raw materials including: filler, mixed curing agent, curing accelerator and bisphenol A epoxy resin, adding the mixed curing agent to the filler and stirring in one direction to obtain a mixture, adding bisphenol A epoxy resin to the obtained mixture at a temperature of 40-50° C., stirring for 5-20 minutes, and then adding the curing accelerator and stirring to obtain the potting material; Step S1.3, vacuum treatment, placing the stator 210 in a cavity for storing the stator 210, and then using a vacuum pump to evacuate the processed stator 210 and the cavity for storing the stator 210; Step S1.4, pouring process, when the vacuum pressure is lower than 500 Pa, pouring the potting material into the preheated stator 210 to complete the pouring; Step S1.4, heat preservation and curing, the stator 210 after vacuum casting is stored at a temperature of 100-150°C for 2-8 hours, wherein the curing temperature change rate is controlled at 3-5°C / h, and then the temperature is adjusted to a constant temperature of 25°C, and then cured for 8-15 hours.

[0031] Through this embodiment, the preheating treatment can reduce the temperature difference when the potting material contacts the stator 210, avoid stress concentration caused by the temperature difference, and improve the potting efficiency; the potting equipment and the cavity are cleaned to ensure the cleanliness of the potting environment of the stator 210, and avoid pollution and the generation of bubbles; by accurately controlling the stirring time and temperature and preparing the potting material according to a specific weight ratio, the mixing effect is optimized, and the uniformity and consistency of the potting material are ensured; the vacuum treatment can effectively remove the space bubbles inside the potting material and the stator 210, ensure the stability of the potting quality, and improve the sealing; by controlling the curing temperature and time, it is ensured that the potting material can be fully cured to improve the final strength and durability, reduce internal stress, and prevent the stator 210 from deformation or cracking.

[0032] In this embodiment, the potting material in step S1.2 is weighed by weight to include 100 parts of bisphenol A epoxy resin, 50-100 parts of mixed curing agent, 100-200 parts of filler, and 0.1-5 parts of curing accelerator, wherein the mixed curing agent is composed of hyperbranched polyester (HBP-SA) and methyltetrahydrophthalic anhydride (MeTHPA).

[0033] Through this embodiment, bisphenol A epoxy resin is used as the potting material, which has excellent chemical stability and mechanical properties, and can better protect the stator 210 and prevent damage caused by external environmental factors; by changing the ratio, the thermal conductivity of the potting material is improved, the thermal conductive cooling effect is improved, and at the same time, the expansion coefficient of the potting material is made close to the expansion coefficient of the electromagnetic wire material, thereby avoiding bulging of the shielding sleeve 310 and preventing damage to the electromagnetic coil; at the same time, the stress micro-cracks that occur in the potting material in a sealed environment can be restored to their original state through the improved self-coupling performance of the potting material, thereby increasing the reliability and service life of the product.

[0034] In this embodiment, the shaping component 300 in step S4 includes a core shaft 320 and a rubber sleeve 330. A hole is opened at one end of the core shaft 320 to form an air inlet 340, and a hole is opened on the side of the core shaft 320 to form an air outlet 350. An air supply channel 360 connecting the air inlet 340 and the air outlet 350 is formed inside the core shaft 320. A limiting nut 370 for fixing the position of the rubber sleeve 330 is provided on the core shaft 320, and a locking nut 380 for locking the limiting nut 370 is also provided on the core shaft 320.

[0035] Through this embodiment, the combination of the core shaft 320 and the rubber sleeve 330 can accurately control the shaping process of the shielding cover 310, ensuring that the size and shape of the shielding cover 310 meet the design requirements; the design of the air inlet 340 at one end of the core shaft 320 and the air outlet 350 on the side can effectively realize the entry and exit of air flow or liquid, and improve the entry and exit efficiency during the shaping process; the design of the limit nut 370 makes the fixation of the rubber sleeve 330 simple and quick, and can be adjusted as needed to ensure the correct position of the shaping component; the design of the locking nut 380 ensures the stability of the limit nut 370 during the shaping process, prevents position changes during operation, and improves the reliability of the shaping; precise fixation and shaping are achieved through mechanical structure, which reduces the errors that may be introduced by manual operation and improves the shaping quality of the shielding cover 310.

[0036] In this embodiment, both ends of the rubber sleeve 330 are U-shaped, and the rubber sleeve 330 is sleeved on the outside of the core shaft 320. The inside of the rubber sleeve 330 and the outside of the core shaft 320 form a storage cavity 390 for liquid injection and gas transmission.

[0037] Through this embodiment, the tight fit between the rubber sleeve 330 and the core shaft 320 can effectively prevent the leakage of liquid or gas, improve the sealing performance, and ensure the sealing of the liquid injection and gas transmission process; the design of the storage cavity 390 makes the injection and delivery of liquid or gas more convenient during the shaping process, which helps to improve production efficiency; the storage cavity 390 also helps to evenly distribute pressure during the shaping process, so that the shaping of the shielding cover 310 is more uniform, reducing deformation or damage caused by uneven pressure; by providing uniform pressure and sealing conditions, the rubber sleeve 330 helps to improve the size and shape consistency of the final shielding cover 310.

[0038] In this embodiment, the shaping of the shielding cover 310 in step S4 includes the following steps: Step S4.1, first fill the rubber sleeve 330 into the shielding cover 310, adjust the shielding cover 310 and the rubber sleeve 330 to fit together, and then tighten the limit nut 370 and the locking nut 380; Step S4.2, adding high-pressure air into the storage cavity 390 from the air inlet 340 of the core shaft 320; Step S4.3, injecting pressurized liquid into the storage cavity 390 from the air inlet 340 of the core shaft 320, the pressurized liquid presses the rubber sleeve 330 to form a seal between the inner side of the U-shaped ends of the rubber sleeve 330 and the core shaft 320, and the shaping is completed; Step S4.4, after the shaping is completed, the pressure is released to release the pressurized liquid, and finally the rubber sleeve 330 is pulled out from the shielding cover 310; Step S4.5, performing automated laser welding; Step S4.6, perform secondary bulging, and repeat steps S4.1-S4.4.

[0039] Through this embodiment, secondary shaping is performed after welding to ensure the dimensional accuracy of the shielding cover 310, reduce the air gap of the motor, reduce the eddy current loss of the shielding cover 310, reduce the temperature rise of the motor, and thus improve the efficiency of the motor; the shaping method is simple to operate, has high working efficiency, and is simple to recover oil or water, will not pollute the working environment and the inner cavity of the shielding cover 310, and reduces production costs.

[0040] Example 2 like Figure 1-3 As shown, this embodiment provides a permanent magnet shielded pump, which includes a permanent magnet shielded pump body 130. The permanent magnet shielded pump body 130 is processed using any permanent magnet shielded pump processing process described in Example 1.

[0041] Through this embodiment, the permanent magnet shielded pump body 130 processed using the permanent magnet shielded pump processing technology in Example 1 includes optimization of the sealing molding of the stator 210 and the shaping of the shielding cover 310, which can significantly improve the performance of the permanent magnet shielded pump 100 and meet the requirements of high performance and reliability.

[0042] In this embodiment, the permanent magnet shielded pump body 130 includes a shielded pump 120 and a permanent magnet shielded motor 110, and a connecting piece 140 for connecting the shielded pump 120 and the permanent magnet shielded motor 110 is provided between the shielded pump 120 and the permanent magnet shielded motor 110. The shielded pump 120 includes a pump cover 190, a base 150 and a water pump casing 160. The water pump casing 160 is a double-layer shell. The water pump casing 160 includes a water pump outer cylinder 170 and a water pump inner cylinder 180. A first cooling channel 181 is formed between the water pump outer cylinder 170 and the water pump inner cylinder 180, and a second cooling channel 182 is formed between the water pump inner cylinder 180 and the permanent magnet shielded motor 110. A water inlet 151 and a water outlet 152 are provided above the base 150.

[0043] Through this embodiment, water flows from the water inlet 151 into the second cooling channel 182, passes through the permanent magnet shielded motor 110 and the shielded pump 120, and then turns at the pump cover 190 and flows out to the water outlet 152 through the first cooling channel 181. Taking the shielded pump 120 with a rated flow rate of 42T as an example, its effective flow rate is 25T-55T, the outer diameter of the permanent magnet shielded motor 110 is Φ138mm, and the inner diameter of the cooling channel is Φ165mm. When the minimum effective flow rate is 25T, 25 tons of water flow passes between the permanent magnet shielded motor 110 and the cooling channel within 1 hour, and the flow rate is 51.2cm / s. When the rated flow rate is 42T, 42 tons of water flow passes between the permanent magnet shielded motor 110 and the cooling channel within 1 hour, and the flow rate is 86cm / s, which can fully take away the heat generated by the permanent magnet shielded motor 110 and improve the efficiency and life of the permanent magnet shielded motor 110.

[0044] In this embodiment, the permanent magnet canned pump body 130 further includes a motor housing 410 and a cable 420 . A potting compound 430 is filled between the motor housing 410 and the cable 420 , and a plurality of sealing rings 440 are provided.

[0045] Through this embodiment, the sealing structure of the motor housing 410 and the cable 420 is optimized and designed, and a multi-level seal is formed by multiple sealing rings 440 and potting glue 430. The waterproof level reaches IP68, and the whole machine can be immersed in water and operate stably, realizing circulating water efficient water cooling, reducing the temperature rise of the permanent magnet shielded motor 100, and improving the efficiency of the whole machine.

[0046] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on one or several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0047] The present invention and its implementation methods are described schematically above, and the description is not restrictive. The embodiments shown in the embodiments are only part of the implementation methods of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by the embodiments and designs a structure and an implementation method similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. A permanent magnet canned pump processing technology, characterized in that: The following steps are involved: Step S1, processing components of the permanent magnet shielded motor (110), including processing the stator (210), and sealing and molding the stator (210) after the processing of the stator (210) is completed; Step S2, processing the canned motor pump (120) components; Step S3, processing the shielding cover (310); Step S4, using the shaping component (300) to process and shape the shielding cover (310); Step S5, assembling the processed permanent magnet canned motor (110) components, canned pump (120) components and the shielding cover (310).

2. A permanent magnet canned pump processing technology according to claim 1, characterized in that: In step S1, the stator (210) is sealed and formed, comprising the following steps: Step S1.1, preheating treatment, cleaning the potting device and the cavity storing the stator (210), and after cleaning, preheating the potting device and the cavity storing the stator (210), with the preheating temperature being 45-55°C; Step S1.2, preparation of potting material, weighing potting raw materials according to weight ratio, the potting raw materials including: filler, mixed curing agent, curing accelerator and bisphenol A epoxy resin, adding the mixed curing agent to the filler and stirring in one direction to obtain a mixture, adding bisphenol A epoxy resin to the obtained mixture at a temperature of 40-50° C., stirring for 5-20 minutes, and then adding the curing accelerator and stirring to obtain the potting material; Step S1.3, vacuum treatment, placing the stator (210) in a cavity for storing the stator (210), and then using a vacuum pump to evacuate the processed stator (210) and the cavity for storing the stator (210); Step S1.4, pouring treatment, when the vacuum pressure is lower than 500 Pa, pouring the potting material into the preheated stator (210) to complete the pouring; Step S1.4, heat preservation and curing, the stator (210) after vacuum casting is stored at a temperature of 100-150°C for 2-8 hours, wherein the curing temperature change rate is controlled at 3-5°C / h, and then the temperature is adjusted to a constant temperature of 25°C, and then cured for 8-15 hours.

3. A permanent magnet canned pump processing technology according to claim 2, characterized in that: The potting material in step S1.2 is weighed by weight to include 100 parts of bisphenol A epoxy resin, 50-100 parts of mixed curing agent, 100-200 parts of filler, and 0.1-5 parts of curing accelerator, wherein the mixed curing agent is composed of hyperbranched polyester (HBP-SA) and methyltetrahydrophthalic anhydride (MeTHPA).

4. A permanent magnet canned pump processing technology according to claim 1, characterized in that: The shaping component (300) in step S4 comprises a core shaft (320) and a rubber sleeve (330); a hole is opened at one end of the core shaft (320) to form an air inlet (340); a hole is opened at the side of the core shaft (320) to form an air outlet (350); an air transmission channel (360) connecting the air inlet (340) and the air outlet (350) is formed inside the core shaft (320); a limiting nut (370) for fixing the position of the rubber sleeve (330) is provided on the core shaft (320); and a locking nut (380) for locking the limiting nut (370) is also provided on the core shaft (320).

5. A permanent magnet canned pump processing technology according to claim 4, characterized in that: The two ends of the rubber sleeve (330) are U-shaped, and the rubber sleeve (330) is sleeved on the outside of the core shaft (320). The inside of the rubber sleeve (330) and the outside of the core shaft (320) form a storage cavity (390) for liquid injection and gas transmission.

6. A permanent magnet canned pump processing technology according to claim 1, characterized in that: The shaping of the shielding cover (310) in step S4 includes the following steps: Step S4.1, first fill the rubber sleeve (330) into the shielding cover (310), adjust the shielding cover (310) and the rubber sleeve (330) to fit together, and then tighten the limit nut (370) and the locking nut (380); Step S4.2, adding high-pressure air into the storage cavity (390) from the air inlet (340) of the core shaft (320); Step S4.3, pressurized liquid is then injected into the storage cavity (390) from the air inlet (340) of the core shaft (320), and the pressurized liquid compresses the rubber sleeve (330) to form a seal between the inner side of the U-shaped ends of the rubber sleeve (330) and the core shaft (320), thereby completing the shaping; Step S4.4, after the shaping is completed, a pressure relief process is performed to release the pressurized liquid, and finally the rubber sleeve (330) is pulled out of the shielding cover (310); Step S4.5, performing automated laser welding; Step S4.6, perform secondary bulging, and repeat steps S4.1-S4.

4.

7. A permanent magnet canned pump, characterized in that: It comprises a permanent magnet shielded pump body (130), and the permanent magnet shielded pump body (130) is processed using a permanent magnet shielded pump processing process as described in any one of claims 1 to 6.

8. A permanent magnet canned pump according to claim 7, characterized in that: The permanent magnet canned motor body (130) comprises a canned pump (120) and a permanent magnet canned motor (110); a connecting piece (140) for connecting the canned pump (120) and the permanent magnet canned motor (110) is provided between the canned pump (120) and the permanent magnet canned motor (110); the canned pump (120) comprises a pump cover (190), a base (150) and a water pump casing (160); the water pump casing (160) is a double-layer casing; the water pump casing (160) comprises a water pump outer cylinder (170) and a water pump inner cylinder (180); a first cooling channel (181) is formed between the water pump outer cylinder (170) and the water pump inner cylinder (180); a second cooling channel (182) is formed between the water pump inner cylinder (180) and the permanent magnet canned motor (110); and a water inlet (151) and a water outlet (152) are provided above the base (150).

9. A permanent magnet canned pump according to claim 7, characterized in that: The permanent magnet canned pump body (130) further comprises a motor housing (410) and a cable (420); a potting compound (430) is filled between the motor housing (410) and the cable (420), and a plurality of sealing rings (440) are provided.

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