Glass fiber reinforced plastic sealing cylinder for motor, special tool and preparation method thereof

Abstract

The application discloses a glass fiber reinforced plastic sealing cylinder for a motor, special tooling thereof and a preparation method, and relates to the technical field of motor sealing. The glass fiber reinforced plastic sealing cylinder comprises a glass fiber reinforced plastic cylinder body, a first metal flange and a second metal flange connected to axial two ends of the glass fiber reinforced plastic cylinder body respectively. At least one sealing groove is arranged on each of the first metal flange and the second metal flange, and an elastic sealing element is arranged in the sealing groove. The elastic sealing element is compressed between the glass fiber reinforced plastic cylinder body and the corresponding metal flange in an assembled state to achieve a sealing effect. Based on the technical scheme disclosed by the application, under the premise of meeting sealing and pressure bearing requirements, the generation of eddy current loss in the motor is avoided, the thermal load of the motor stator is reduced, the service life of the motor is prolonged, and the operation efficiency, power density and reliability of the motor are improved.

Description

Technical Field

[0001] This invention relates to the field of motor sealing technology, specifically to a fiberglass sealing cylinder for motors, its special tooling, and its preparation method. Background Technology

[0002] In traditional electric motors, the stator is typically cooled using forced air cooling or a water-jacketed frame. However, with the iterative advancements in motor technology and the development of electromagnetic materials, the air gap magnetic flux density of rotating electric motors is continuously increasing, leading to a rise in the motor's thermal load. Traditional forced air cooling or water-jacketed frame cooling methods are no longer sufficient to meet the cooling requirements of high magnetic flux density motor stators. Therefore, an internal circulation immersion oil cooling method with higher heat exchange efficiency can be introduced to cool high magnetic flux density motor stators. However, this method requires the stator to be sealed, and the sealing structure must have a certain pressure-bearing capacity.

[0003] In related technologies, conventional components are typically sealed using metal structural parts in conjunction with O-rings. However, for high magnetic flux density motors, if metal structural parts are used as the sealing structure between the motor stator and rotor, the rotating magnetic field generated by the rotor will induce significant eddy current losses on the metal sealing structure, thereby significantly increasing the thermal load on the motor stator.

[0004] Therefore, there is an urgent need to develop a sealing structure that can meet the requirements of motor stator sealing and pressure bearing, while avoiding large eddy current losses in the sealing cylinder. This is of great significance for the further development of motor technology. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and to propose a fiberglass sealing cylinder for motors, its special tooling and preparation method, thereby solving the technical problem that the eddy current loss is large when the motor uses metal sealing structure components, which leads to an increase in the thermal load of the motor stator.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a fiberglass sealing cylinder for an electric motor, comprising a fiberglass cylinder body and a first metal flange and a second metal flange respectively connected to the two axial ends of the fiberglass cylinder body; both the first metal flange and the second metal flange are provided with at least one sealing groove, and an elastic sealing element is provided in the sealing groove. The elastic sealing element is compressed between the fiberglass cylinder body and the corresponding metal flange in the assembled state to achieve a sealing effect.

[0007] In some embodiments, the fiberglass cylinder is made of fiberglass composite material wound together. The winding direction of the fiberglass composite material includes a first direction and a second direction. The first direction has an angle of 5°-15° with the axial direction of the fiberglass cylinder, and the second direction has an angle of 85°-95° ​​with the axial direction of the fiberglass cylinder.

[0008] In some embodiments, the first metal flange is an outer metal flange, and the second metal flange is an inner metal flange; the sealing groove includes a radial groove extending radially along the corresponding metal flange and / or an axial groove extending axially along the corresponding metal flange.

[0009] Secondly, the present invention also provides a special tooling for manufacturing a fiberglass sealing cylinder for an electric motor as described in the first aspect, comprising: A fiberglass cylindrical support fixture is used to support and round the fiberglass cylindrical body during the assembly process; Assembly fixtures are used to align and press the first metal flange and the second metal flange to the two ends of the fiberglass cylinder, respectively. The fiberglass cylindrical support fixture is provided with a guide mating hole, and the assembly fixture is provided with a guide rod. The guide rod is configured to be inserted into the guide mating hole to ensure the coaxiality of the first metal flange and the second metal flange.

[0010] In some embodiments, the fiberglass cylindrical support fixture includes: The inner tube cylinder is supported by multiple threaded holes and multiple through holes along the circumference of its inner wall. Multiple sector-shaped support fixtures are arranged around the outer side of the inner tube support cylinder, and each sector-shaped support fixture has a threaded rod fixed to its inner wall, the threaded rod passing through a through hole on the inner wall of the inner tube support cylinder. Multiple jacking screws are respectively disposed in various threaded holes on the inner wall of the inner tube support cylinder, for pushing each of the sector-shaped support fixtures outward to the target position; Multiple locking nuts, each used to engage with a threaded rod, lock each of the sector-shaped support fixtures in the target position; and Two support flanges are respectively located at both ends of the inner tube support cylinder and are respectively connected to the inner tube support cylinder.

[0011] In some embodiments, eight fan-shaped support fixtures are provided, and the central angle of each fan-shaped support fixture on the inner tube cylinder is 45°.

[0012] In some embodiments, the assembly fixture includes: The first flange assembly fixture is used to fix the first metal flange; The second flange assembly fixture is used to fix the second metal flange; and Multiple press-fit screws are respectively installed on the first flange assembly fixture and the second flange assembly fixture, and each of the press-fit screws connects the fiberglass cylinder support fixture and the corresponding flange assembly fixture along the axial direction of the fiberglass cylinder body, so as to apply axial press-fit force to the metal flange on the corresponding side when tightening.

[0013] Thirdly, the present invention also provides a method for preparing a fiberglass sealing cylinder for an electric motor, using the special tooling described in the second aspect, comprising the following steps: S1. Preparation of fiberglass cylinder; S2. Fit the fiberglass cylinder onto the fiberglass cylindrical support fixture, and use the fiberglass cylindrical support fixture to make the fiberglass cylinder round; S3. Install the first metal flange and the second metal flange on the assembly fixture, and pre-set elastic sealing elements in the sealing grooves on the first metal flange and the second metal flange. S4. Apply adhesive to the ends of the fiberglass cylinder and / or the outer wall of the metal flange; S5. Assemble the fiberglass cylinder support fixture and the assembly fixture, and use the assembly fixture to align and press the first metal flange and the second metal flange with the two ends of the fiberglass cylinder body respectively, so that the elastic seal is compressed. S6. Maintain the pressing state until the adhesive has fully cured; S7. Remove the fiberglass cylindrical support fixture and the assembly fixture to obtain a fiberglass sealing cylinder with a metal flange. In some embodiments, step S1 includes: using glass fiber composite material, winding the fiberglass cylinder winding mold with alternating winding angles of 10° and 90°, and then performing high-temperature curing and demolding.

[0014] In some embodiments, in step S6, the adhesive is maintained in a press-fit state for at least 12 hours to cure.

[0015] Compared with the prior art, the present invention provides a fiberglass sealing cylinder for motors, its special tooling, and its preparation method. By combining the special tooling with the preparation method, the fiberglass sealing cylinder for motors is prepared. The fiberglass sealing cylinder uses a fiberglass cylinder body as the main body of the sealing structure. Since fiberglass is a non-magnetic material, eddy currents will not be induced when the rotor's rotating magnetic field passes through the fiberglass cylinder body, thereby eliminating eddy current losses at the source. At the same time, the metal flanges at both ends can ensure reliable installation and connection between the fiberglass sealing cylinder and other components of the motor, and the elastic sealing elements provided on the metal flanges are compressed into the corresponding sealing grooves in the assembled state, forming an effective seal to withstand the pressure required by the immersion cooling circulation system.

[0016] In this way, by using the FRP cylinder to bear pressure and conduct magnets, combined with the installation and sealing of the metal flange, the generation of eddy current loss is avoided and the thermal load of the motor stator is reduced while meeting the sealing and pressure requirements. This not only helps to extend the life of the motor, but also improves the motor's operating efficiency, power density and reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a fiberglass sealing cylinder in one embodiment of the present invention; Figure 2 This is an assembly diagram of the fiberglass sealing cylinder in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a fiberglass cylindrical support fixture in one embodiment of the present invention; Figure 4 This is an assembly diagram of the first flange assembly fixture and the first metal flange in one embodiment of the present invention; Figure 5 This is an assembly diagram of the second flange assembly fixture and the second metal flange in one embodiment of the present invention; Figure 6 This is a schematic flowchart of a method for preparing a fiberglass sealing cylinder according to one embodiment of the present invention; Figure 7 This is a schematic diagram of the winding of a fiberglass cylinder on a fiberglass cylinder winding mold in one embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the application of a fiberglass sealing cylinder on a motor in one embodiment of the present invention.

[0018] Explanation of reference numerals in the attached drawings: 10. Fiberglass sealing cylinder; 11. Fiberglass cylinder body; 12. First metal flange; 13. Second metal flange; 14. Elastic sealant; 15. Sealant; 20. Fiberglass cylinder support fixture; 21. Support inner tube cylinder; 22. Fan-shaped support fixture; 23. Lifting screw; 24. Locking nut; 25. Bracket flange; 251. Guide mating hole; 26. Threaded rod; 30. Assembly fixture; 31. First flange assembly fixture; 32. Second flange assembly fixture; 33. Press-fit screw; 34. Guide rod; 40. Fiberglass cylinder winding mold; 50. Motor; 51. Motor stator; 52. Motor rotor; 53. Sealing plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] In related technologies, conventional components are typically sealed using metal structural parts in conjunction with O-rings. However, for high magnetic flux density motors, if metal structural parts are used as the sealing structure between the motor stator and rotor, the rotating magnetic field generated by the rotor will induce significant eddy current losses on the metal sealing structure, thereby significantly increasing the thermal load on the motor stator.

[0021] To address the aforementioned technical problems, this invention provides a fiberglass sealing cylinder for motors, its dedicated tooling, and a manufacturing method. While meeting sealing and pressure requirements, it avoids eddy current losses, reduces the thermal load on the motor stator, and not only helps extend the motor's lifespan but also improves the motor's operating efficiency, power density, and reliability.

[0022] Please see Figure 1 This invention provides a fiberglass sealing cylinder for motors. The fiberglass sealing cylinder 10 includes a fiberglass cylinder body 11, a first metal flange 12, a second metal flange 13, and an elastic sealing element 14. The first metal flange 12 and the second metal flange 13 are respectively disposed at both axial ends of the fiberglass cylinder body 11 and are fixedly connected to the fiberglass cylinder body 11.

[0023] In some embodiments, the fiberglass cylinder 11 can be made of glass fiber composite material, for example, it can be formed by winding glass fiber yarn on a fiberglass cylinder winding mold 40 to form a specified cylinder structure. In this case, the fiberglass cylinder 11 has excellent axial and radial strength, and its material is a non-magnetic material. With this configuration, when the fiberglass sealing cylinder 10 is applied in a motor as a stator sealing structure, the rotating magnetic field generated by the rotor can pass through the fiberglass cylinder 11 without loss, and without generating eddy currents in the cylinder.

[0024] For example, the first metal flange 12 and the second metal flange 13 can be made of metal materials (such as aluminum alloy, stainless steel, or carbon steel) to ensure the connection strength and sealing reliability with other motor components (such as stator frame and sealing plate). To facilitate assembly with the inner and outer sleeves of the motor stator, according to design requirements, the first metal flange 12 can be configured as the outer metal flange, and the second metal flange 13 can be configured as the inner metal flange. Specifically, the outer metal flange can be located at the outer end of the fiberglass cylinder 11, and the inner metal flange can be located at the inner end of the fiberglass cylinder 11. Because the gap between the motor stator and rotor is very small, when installing the motor rotor, the motor rotor is fitted through the first metal flange 11 side, and when installing the motor stator, the motor stator is fitted through the second metal flange 12 side.

[0025] In some embodiments, please refer to Figure 1 Each of the first metal flange 12 and the second metal flange 13 is provided with at least one sealing groove, and an elastic sealing element 14 is provided in the sealing groove. In the assembled state, the elastic sealing element 14 can be compressed between the fiberglass cylinder 11 and the corresponding metal flange (i.e., the first metal flange 12 or the second metal flange 13), thereby achieving a sealing effect.

[0026] For example, taking any of the metal flanges as an example, the sealing groove may include a radial groove extending radially along the corresponding metal flange and / or an axial groove extending axially along the metal flange. For instance, the metal flange may simultaneously have radial and axial grooves, each used to accommodate two independent elastic seals 14. The radial groove may be formed on the cylindrical surface where the metal flange mates with the fiberglass cylinder 11, and the corresponding elastic seal 14 is compressed between the outer wall of the metal flange and the inner wall of the fiberglass cylinder 11 to form a radial seal. The axial groove may be formed on the end face or stepped surface of the metal flange, and the corresponding elastic seal 14 is compressed between the end face or stepped surface of the metal flange and the end face of the fiberglass cylinder 11 to form an axial seal. This configuration, through a dual radial and axial sealing structure, can significantly improve sealing reliability and prevent cooling oil leakage.

[0027] Furthermore, the elastic seal 14 can be an O-ring, made of nitrile rubber, fluororubber, or silicone rubber, selected based on the motor's operating temperature range and the chemical compatibility of the cooling medium. The cross-sectional diameter of the O-ring and the dimensions of the sealing groove are matched according to national standards or industry specifications to ensure that the seal is compressed by 15% to 30% after assembly, thereby achieving optimal sealing performance. Of course, to ensure the stability of the O-ring in the corresponding sealing groove, an adhesive can also be used to bond the O-ring to the corresponding sealing groove.

[0028] In some embodiments, such as Figure 1 As shown, sealant 15 is also filled between the contact surfaces of the first metal flange 12 and the fiberglass cylinder 11, and between the contact surfaces of the second metal flange 13 and the fiberglass cylinder 11. This sealant 15 can be an epoxy resin, polyurethane, or acrylic structural adhesive, which, after curing, exhibits high shear strength and peel strength, while also being oil-resistant, heat-resistant, and aging-resistant. This arrangement not only firmly bonds the metal flanges to the fiberglass cylinder 11 but also fills the minute gaps between them caused by processing tolerances, further improving the sealing effect.

[0029] Please see Figure 2 The present invention also provides a special tooling for preparing the FRP sealing cylinder 10 for motors in any of the above embodiments. The special tooling may include a FRP cylinder support tooling 20 and an assembly tooling 30.

[0030] In some embodiments, such as Figure 3 As shown, the fiberglass cylinder support fixture 20 is used to support and round the fiberglass cylinder 11 during the assembly process, preventing the fiberglass cylinder 11 from deforming during the gluing and pressing processes. The fiberglass cylinder support fixture 20 includes a supporting inner tube cylinder 21, multiple sector-shaped support fixtures 22, multiple jacking screws 23, multiple locking nuts 24, and two bracket flanges 25.

[0031] For example, the inner tube support cylinder 21 can be configured as a hollow metal cylinder with an outer diameter slightly smaller than the inner diameter of the fiberglass cylinder 11. Multiple threaded holes and multiple through holes are evenly provided along the circumferential direction on the inner wall of the inner tube support cylinder 21. The threaded holes are used to install the lifting screws 23, while the through holes are used to pass through the threaded rods 26 on the fan-shaped support fixture 22.

[0032] Furthermore, multiple sector-shaped support fixtures 22 can be arranged around the outer side of the inner tube support cylinder 21, and the outer arc surface of each sector-shaped support fixture 22 can fit against the inner wall of the fiberglass cylinder 11. A threaded rod 26 is fixed to the inner wall of the sector-shaped support fixture 22, which can pass through the through hole on the inner tube support cylinder 21 and extend inward. It should be noted that the number of sector-shaped support fixtures 22 can be flexibly set as needed; for example, eight sector-shaped support fixtures 22 can be set, in which case the central angle corresponding to each sector-shaped support fixture 22 on the inner tube support cylinder 21 is 45°. With this arrangement, the multiple sector-shaped support fixtures 22 can be evenly spread outward, giving the fiberglass cylinder 11 good roundness.

[0033] For example, each jacking screw 23 can be installed in a threaded hole on the inner wall of the inner tube cylinder 21, with its end facing the inner wall of the sector-shaped support fixture 22. Meanwhile, each sector-shaped support fixture 22 can correspond to the same number of jacking screws 23, and for any sector-shaped support fixture 22, the relative position of the jacking screws 23 to that sector-shaped support fixture 22 can be flexibly set as needed, ensuring that each jacking screw 23 is evenly distributed on the inner side of the sector-shaped support fixture 22.

[0034] With this configuration, rotating the lifting screw 23 can push the corresponding sector-shaped support fixture 22 outward, thereby ensuring that the outer arc surface of the sector-shaped support fixture 22 fits tightly against the inner wall of the fiberglass cylinder 11, achieving the rounding operation. After the lifting screw 23 adjusts the sector-shaped support fixture 22 to the target position (i.e., the fiberglass cylinder 11 returns to its true roundness), the locking nut 24 can engage with the threaded rod 26 and be tightened, thereby locking the sector-shaped support fixture 22 in this position and preventing it from loosening in subsequent processes.

[0035] For example, two support flanges 25 can be respectively set at both ends of the inner tube support cylinder 21, and can be fixedly connected to the inner tube support cylinder 21 by bolts or a stop structure. Each support flange 25 can be provided with multiple guide mating holes 251, and the guide mating holes 251 on each support flange 25 can be evenly distributed circumferentially around the corresponding support flange 25. With this configuration, the support flanges 25 can, on the one hand, connect the inner tube support cylinder 21 and the fan-shaped support fixture 22 into an integral rigid frame, preventing structural deformation of the fiberglass cylinder support fixture 20 during transportation or pressing. On the other hand, they can also provide an interface for lifting and transportation, facilitating the movement of the entire fiberglass cylinder support fixture 20 together with the fiberglass cylinder body 11 to the assembly platform. Furthermore, the end face of the support flange 25 can also serve as a positioning reference for axial clamping with the assembly fixture 30.

[0036] In some embodiments, please refer to Figure 2 The assembly fixture 30 can be used to align and press the first metal flange 12 and the second metal flange 13 with the two ends of the fiberglass cylinder 11, respectively. The assembly fixture 30 may include a first flange assembly fixture 31, a second flange assembly fixture 32, and a plurality of press-fit screws 33.

[0037] For example, such as Figures 4-5As shown, the first flange assembly fixture 31 can be used to fix the aforementioned first metal flange 12 (i.e., the outer metal flange). It is provided with threaded holes corresponding to the bolt holes on the first metal flange 12, so that the first metal flange 12 can be firmly installed on the first flange assembly fixture 31 by bolts. The second flange assembly fixture 32 can be used to fix the second metal flange 13 (i.e., the inner metal flange). Its structure is similar to that of the first flange assembly fixture 31, but its size and shape match those of the inner metal flange.

[0038] Meanwhile, multiple guide rods 34 can be provided on both the first flange assembly fixture 31 and the second flange assembly fixture 32. The guide rods 34 can extend along the axial direction of the fiberglass cylinder 11. Furthermore, the positions of the guide rods 34 can correspond one-to-one with the guide mating holes 251 on the fiberglass cylinder support fixture 20 (i.e., the guide mating holes 251 provided on the two support flanges 25). During press fitting, the guide rods 34 can be inserted into the corresponding guide mating holes 251, thereby ensuring the coaxiality between the first metal flange 12 and the second metal flange 13 and the fiberglass cylinder 11.

[0039] Furthermore, such as Figure 2 As shown, each press-fit screw 33 can be respectively installed on the first flange assembly fixture 31 and the second flange assembly fixture 32. Taking one of the flange assembly fixtures 30 (i.e., either the first flange assembly fixture 31 or the second flange assembly fixture 32) as an example, the number of press-fit screws 33 on it can be 4, 6 or 8, and each press-fit screw 33 can be evenly distributed on the circumference to ensure uniform pressing force. At the same time, each press-fit screw 33 can extend along the axial direction of the fiberglass cylinder 11 and connect to the fiberglass cylinder support fixture 20. For example, the press-fit screw 33 can pass through the through hole on the corresponding flange assembly fixture 30, and its end can pass through the adjacent side support flange 25 and connect to the threaded hole on the end face of the inner tube cylinder 21.

[0040] With this configuration, by tightening the press screw 33, the corresponding flange assembly fixture 30, together with the corresponding metal flange (i.e., the first metal flange 12 or the second metal flange 13), can be pulled towards the fiberglass cylinder support fixture 20, thereby pressing the metal flange on the corresponding side into the end of the fiberglass cylinder 11, while compressing the elastic seal 14 and squeezing out excess adhesive.

[0041] Please see Figure 6 This invention also provides a method for preparing a fiberglass sealing cylinder for an electric motor, which utilizes the special tooling as described in any of the above embodiments, and can prepare the fiberglass sealing cylinder 10 as described in any of the above embodiments. The preparation method may include the following steps: S1. Preparation of fiberglass cylinder 11.

[0042] In some embodiments, in conjunction with the appendix Figure 7 The fiberglass cylinder 11 can be formed by winding fiberglass composite material (such as fiberglass yarn) on a fiberglass cylinder winding mold 40. To ensure that the fiberglass cylinder 11 has sufficient axial and radial strength, the fiberglass yarn can be oriented in two directions during winding: the first direction has an angle of 5° to 15° with the axial direction of the fiberglass cylinder 11, and the second direction has an angle of 85° to 95° with the axial direction of the fiberglass cylinder 11. For example, the first direction can preferably be 10°, and the second direction can preferably be 90°. With this configuration, the small-angle winding in the first direction can provide sufficient axial strength for the fiberglass cylinder 11, while the circumferential winding in the second direction can provide sufficient radial strength. The two winding methods can be alternated, or circumferential winding can be performed first and then axial winding can be performed, or a multi-layer structure can be used, with the two angles alternating in each layer.

[0043] For example, in step S1, a fiberglass cylinder winding mold 40 can be fabricated according to the dimensions required by the design. This fiberglass cylinder winding mold 40 can be configured as a cylindrical metal mold with a slight taper to facilitate demolding. A release agent (such as silicone grease or a polytetrafluoroethylene coating) can be evenly applied to the mold surface. Then, a fiberglass composite material (such as fiberglass yarn) can be used to wind the desired fiberglass cylinder 11 onto the fiberglass cylinder winding mold 40.

[0044] During the winding process, the winding angle of the glass fiber yarn can be controlled, so that some fibers are wound axially at an angle of 10° to the axis of the cylinder, and other fibers are wound circumferentially at an angle of 90° to the axis of the cylinder. The two winding angles can be alternated, for example, first winding a circumferential layer, then winding a layer of axial layer, and so on, with the total number of layers determined according to the design wall thickness (e.g., 10 to 20 layers).

[0045] In some embodiments, after the winding is completed, the mold with the winding layer can be placed in a high-temperature curing oven and cured according to a recommended curing curve. The curing temperature and time are determined according to the resin system; for example, it can be held at 120°C for 2 hours, and then heated to 150°C for 1 hour. After curing, it can be naturally cooled to room temperature. Then, the fiberglass cylinder 11 can be demolded, for example, by using a mechanical demolding method, using an ejector device to remove the fiberglass cylinder 11 from the mold.

[0046] For example, after completing the above steps, the inner wall of the fiberglass cylinder 11 (especially the area bonded to the metal flange) can be machined, such as by turning or grinding, to remove surface release agent residue and create a certain degree of roughness, thereby enhancing the adhesive strength and ensuring the dimensional accuracy of the inner diameter of the fiberglass cylinder 11 and its fit clearance with the metal flange (which can be 0.1mm to 0.3mm). Furthermore, this machining step can also create a space for adhesive filling; for example, shallow spiral grooves or corrugated grooves can be machined on the inner wall of the fiberglass cylinder 11 to accommodate more adhesive and ensure uniform distribution of the adhesive.

[0047] S2. The fiberglass cylinder 11 is fitted onto the fiberglass cylindrical support fixture 20, and the fiberglass cylinder 11 is rounded by the fiberglass cylindrical support fixture 20.

[0048] For example, in step S2, the inner tube cylinder 21 of the fiberglass cylinder support fixture 20 can be placed vertically along its axis. The threaded rod 26 of the sector-shaped support fixture 22 is passed through the through hole on the inner tube cylinder, and a locking nut 24 is pre-installed on the threaded rod 26. Then, the fiberglass cylinder 11 is fitted onto the outside of the sector-shaped support fixture 22 from top to bottom, so that the sector-shaped support fixture 22 is located inside the fiberglass cylinder 11. Next, from the inside of the inner tube cylinder 21, the lifting screws 23 are tightened one by one with a wrench, so that the heads of the lifting screws 23 push the sector-shaped support fixture 22 outward. As the lifting screws 23 are screwed in, the outer arc surface of the sector-shaped support fixture 22 gradually contacts the inner wall of the fiberglass cylinder 11 and applies an outward expanding force.

[0049] At this point, a dial indicator or roundness tester can be used to measure the roundness of the outer circle of the fiberglass cylinder 11. When the roundness meets the design requirements (e.g., no more than 0.1 mm), stop tightening the lifting screw 23. Then, tighten the locking nut 24 to lock the position of the sector-shaped support fixture 22. Finally, install the two bracket flanges 25 on the axial ends of the inner tube cylinder 21 respectively and tighten them with bolts. In this way, the fiberglass cylinder 11, the fiberglass cylinder support fixture 20, and the bracket flanges 25 become a whole, which can be safely hoisted and transported.

[0050] S3. Install the first metal flange 12 and the second metal flange 13 on the assembly fixture 30, and pre-set an elastic sealing element 14 in the sealing groove on the first metal flange 12 and the second metal flange 13.

[0051] For example, in step S3, the first metal flange 12 (i.e., the outer metal flange) can be bolted to the first flange assembly fixture 31, and the second metal flange 13 (i.e., the inner metal flange) can be bolted to the second flange assembly fixture 32. Before fixing, the surface of the metal flange should be cleaned to remove oil and rust. Then, the resilient seals 14 (O-rings) are installed into the sealing grooves on the metal flanges respectively.

[0052] It should be noted that during installation, the O-ring should not be twisted, and it should be ensured that the O-ring is completely seated at the bottom of the sealing groove. To prevent the O-ring from falling off during subsequent operations, a small amount of grease or instant adhesive (such as cyanoacrylate glue) can be applied to the sealing groove to temporarily bond the O-ring to it.

[0053] S4. Apply adhesive to the ends of the fiberglass cylinder 11 and / or the outer wall of the metal flange.

[0054] For example, in step S4, a special adhesive application tool can be used to evenly apply high-strength sealant 15 (such as a two-component epoxy structural adhesive) to the inner walls of both ends of the fiberglass cylinder 11, as well as to the outer cylindrical surface where the metal flange mates with the fiberglass cylinder 11. The thickness of the adhesive application should be controlled between 0.2 mm and 0.5 mm to ensure that the gap is filled after pressing without excessive overflow. It should be noted that the adhesive should be avoided from being applied to the sealing groove and the elastic seal 14, so as not to affect the sealing performance.

[0055] S5. Assemble the fiberglass cylindrical support fixture 20 and the assembly fixture 30, and use the assembly fixture 30 to align and press the first metal flange 12 and the second metal flange 13 with the two ends of the fiberglass cylinder 11 respectively, so that the elastic seal 14 is compressed.

[0056] For example, in step S5, the fiberglass cylinder support fixture 20 with the fiberglass cylinder body 11 can be placed horizontally to ensure its axis is horizontal. Then, the first flange assembly fixture 31 with the first metal flange 12 can be approached from one side of the fiberglass cylinder support fixture 20, aligning its guide rod 34 with the guide mating hole 251 on the end face of the inner tube cylinder 21, and slowly pushed in until the guide rod 34 is fully inserted into the guide mating hole 251. Next, the second flange assembly fixture 32 with the second metal flange 13 can be approached from the other side of the fiberglass cylinder support fixture 20, inserting its guide rod 34 into the corresponding guide mating hole 251.

[0057] At this point, the two metal flanges (i.e., the first metal flange 12 and the second metal flange 13) are roughly aligned with the ends of the fiberglass cylinder 11. Then, each press-fit screw 33 can be passed through the through holes on the flange assembly fixture 30 and screwed into the threaded holes on the end face of the inner tube cylinder 21. Using a torque wrench, the press-fit screws 33 are gradually tightened in a diagonal sequence, causing the metal flanges to slowly press into the ends of the fiberglass cylinder 11. During the press-fitting process, the elastic seal 14 first contacts the fiberglass cylinder 11 and begins to be compressed, subsequently the adhesive is squeezed and filled into the gap between the corresponding metal flange and the fiberglass cylinder 11. Continue tightening the press-fit screws 33 until the metal flanges reach the predetermined axial position. At this point, the elastic seal 14 is compressed to the designed compression amount, forming a reliable seal.

[0058] S6. Maintain the pressing state until the adhesive has fully cured.

[0059] For example, in step S6, after press-fitting is completed, the press-fitting screw 33 can be kept locked and not loosened. The entire assembly (including the fiberglass cylindrical support fixture 20, assembly fixture 30, fiberglass cylinder 11, and two metal flanges) is left to stand at room temperature or heated in an oven to accelerate curing. The curing time of the adhesive can be determined according to its type and ambient temperature. For room temperature curing epoxy adhesives, the time for curing the adhesive while maintaining the press-fitting state is at least 12 hours. Of course, if it is necessary to shorten the curing time, the ambient temperature can be increased, which will not be elaborated here.

[0060] S7. Remove the fiberglass cylinder support fixture 20 and the assembly fixture 30 to obtain a fiberglass sealing cylinder 10 with a metal flange.

[0061] For example, in step S7, after the adhesive has fully cured, the various press-fit screws 33 can be loosened and removed from the fiberglass cylinder support fixture 20 and assembly fixture 30. Then, the bolts used to fix the metal flange to the corresponding flange assembly fixture 30 are removed, separating the flange assembly fixture 30 from the corresponding metal flange. Next, the connecting bolts between the bracket flange 25 and the inner tube support cylinder 21 can be loosened from the end of the fiberglass cylinder support fixture 20, and the bracket flanges 25 on both sides can be removed. Finally, the lock nut 24 can be loosened and the lifting screw 23 can be unscrewed, causing the fan-shaped support fixture 22 to retract inward. Then, the inner tube support cylinder 21, together with the fan-shaped support fixture 22, can be axially pulled out from the inside of the fiberglass cylinder 11. At this point, a complete fiberglass sealing cylinder 10 with metal flanges for motors is completed.

[0062] Please see Figure 8To facilitate understanding of the principles of the embodiments of the present invention, this embodiment also provides an application example of the prepared fiberglass sealing cylinder 10 in a motor 50. Specifically, the motor 50 includes a motor stator 51, a motor rotor 52, and the fiberglass sealing cylinder 10 prepared in the above embodiment. The fiberglass sealing cylinder 10 is installed between the motor stator 51 and the motor rotor 52, and its two ends are connected to the sealing plates 53 on both sides through a first metal flange 12 and a second metal flange 13, respectively, and can be sealed using O-rings.

[0063] In practical applications, the motor stator 51 is immersed in cooling oil, and the fiberglass sealing cylinder 10 confines the cooling oil to the stator side, preventing oil from entering the rotor air gap. Since the fiberglass cylinder 11 is non-magnetic, there is no eddy current loss when the rotor rotating magnetic field passes through it, thereby greatly reducing the thermal load on the stator and improving the operating efficiency and reliability of the motor 50.

[0064] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A fiberglass sealing cylinder for an electric motor, characterized in that, The device includes a fiberglass cylinder and a first metal flange and a second metal flange connected to the two ends of the fiberglass cylinder respectively in the axial direction. At least one sealing groove is provided on both the first metal flange and the second metal flange. An elastic sealing element is provided in the sealing groove. The elastic sealing element is compressed between the fiberglass cylinder and the corresponding metal flange in the assembled state to achieve a sealing effect.

2. The fiberglass sealing cylinder for motors according to claim 1, characterized in that, The fiberglass cylinder is made of fiberglass composite material wound together. The winding direction of the fiberglass composite material includes a first direction and a second direction. The first direction has an angle of 5°-15° with the axial direction of the fiberglass cylinder, and the second direction has an angle of 85°-95° ​​with the axial direction of the fiberglass cylinder.

3. The fiberglass sealing cylinder for motors according to claim 1, characterized in that, The first metal flange is an outer metal flange, and the second metal flange is an inner metal flange; the sealing groove includes a radial groove extending radially along the corresponding metal flange and / or an axial groove extending axially along the corresponding metal flange.

4. A special tooling for preparing a fiberglass sealing cylinder for an electric motor as described in any one of claims 1-3, characterized in that, include: A fiberglass cylindrical support fixture is used to support and round the fiberglass cylindrical body during the assembly process; Assembly fixtures are used to align and press the first metal flange and the second metal flange to the two ends of the fiberglass cylinder, respectively. The fiberglass cylindrical support fixture is provided with a guide mating hole, and the assembly fixture is provided with a guide rod. The guide rod is configured to be inserted into the guide mating hole to ensure the coaxiality of the first metal flange and the second metal flange.

5. The special tooling according to claim 4, characterized in that, The fiberglass cylindrical support fixture includes: The inner tube cylinder is supported by multiple threaded holes and multiple through holes along the circumference of its inner wall. Multiple sector-shaped support fixtures are arranged around the outer side of the inner tube support cylinder, and each sector-shaped support fixture has a threaded rod fixed to its inner wall, the threaded rod passing through a through hole on the inner wall of the inner tube support cylinder. Multiple jacking screws are respectively disposed in various threaded holes on the inner wall of the inner tube support cylinder, for pushing each of the sector-shaped support fixtures outward to the target position; Multiple locking nuts, each used to engage with a threaded rod, lock each of the sector-shaped support fixtures in the target position; and Two support flanges are respectively located at both ends of the inner tube support cylinder and are respectively connected to the inner tube support cylinder.

6. The special tooling according to claim 5, characterized in that, There are 8 fan-shaped support fixtures, and the central angle of each fan-shaped support fixture on the inner tube cylinder is 45°.

7. The special tooling according to claim 4, characterized in that, The assembly fixture includes: The first flange assembly fixture is used to fix the first metal flange; The second flange assembly fixture is used to fix the second metal flange; and Multiple press-fit screws are respectively installed on the first flange assembly fixture and the second flange assembly fixture, and each of the press-fit screws connects the fiberglass cylinder support fixture and the corresponding flange assembly fixture along the axial direction of the fiberglass cylinder body, so as to apply axial press-fit force to the metal flange on the corresponding side when tightening.

8. A method for preparing a fiberglass sealing cylinder for an electric motor, characterized in that, The application of the special tooling as described in any one of claims 4-7 includes the following steps: S1. Preparation of fiberglass cylinder; S2. Fit the fiberglass cylinder onto the fiberglass cylindrical support fixture, and use the fiberglass cylindrical support fixture to make the fiberglass cylinder round; S3. Install the first metal flange and the second metal flange on the assembly fixture, and pre-set elastic sealing elements in the sealing grooves on the first metal flange and the second metal flange. S4. Apply adhesive to the ends of the fiberglass cylinder and / or the outer wall of the metal flange; S5. Assemble the fiberglass cylinder support fixture and the assembly fixture, and use the assembly fixture to align and press the first metal flange and the second metal flange with the two ends of the fiberglass cylinder body respectively, so that the elastic seal is compressed. S6. Maintain the pressing state until the adhesive has fully cured; S7. Remove the fiberglass cylinder support fixture and the assembly fixture to obtain a fiberglass sealing cylinder with a metal flange.

9. The preparation method according to claim 8, characterized in that, Step S1 includes: using glass fiber composite material, winding the fiberglass cylinder winding mold with two winding angles of 10° and 90° alternately, and then performing high-temperature curing and demolding.

10. The preparation method according to claim 8, characterized in that, In step S6, the adhesive is kept in a press-fit state for at least 12 hours to cure.

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