Magnet impregnation framework and method

Abstract

The invention discloses a magnet impregnation skeleton, and relates to the technical field of superconducting magnets, the device comprises a fixed cylinder, a first cold conduction member, a coil skeleton, a second cold conduction member and a sealing structure, and the first cold conduction member is attached to the outer surface of the fixed cylinder. The first cold conduction piece and the second cold conduction piece are preassembled on the fixed cylinder and the coil framework to form the closed impregnation cavity, so that resin can synchronously permeate into the magnet coil and interfaces of all parts by virtue of capillary action during vacuum pressure impregnation, and microscopic gaps caused by a traditional post-assembly mode are eliminated; all-dimensional seamless attachment of the cold conduction piece and the coil is achieved, a sealing system formed by the sealing structure and the fixing cylinder is combined with a composite structure formed by resin curing, powerful external restraining and supporting are provided for the magnet coil wound on the coil framework, and the sealing effect of the magnet coil is improved. The framework deformation caused by electromagnetic force and thermal stress in the winding, processing and running processes of the coil is effectively inhibited, and the stability and reliability of long-term running of the magnet are ensured.

Description

Technical Field

[0001] This invention relates to the field of superconducting magnet technology, and in particular to a magnet impregnation framework and method. Background Technology

[0002] Large magnet coils (including small and large solenoid coils and irregularly shaped coils such as saddle-shaped coils) are typically wound using wet or dry winding processes. A crucial subsequent step is installing a cooling conductor after the coil impregnation treatment. Current methods for installing cooling conductors often involve applying resin to the conductor and coil surface, then securing it with bolts to achieve a close fit. However, because the shape and characteristics of the cooling conductor are difficult to perfectly match the coil's surface contour, and the resin has limited fluidity, this installation method often fails to achieve a tight seal, directly resulting in poor coil cooling performance and affecting the overall working performance of the magnet.

[0003] Meanwhile, the existing process of assembling the cooling components after impregnation has several drawbacks: the resin applied to the bonding surface can easily flow to other bonding surfaces of the cooling components, interfering with the bonding of other cooling components and further reducing the overall compatibility of the cooling system; overflowing resin requires manual cleaning at irregular intervals, consuming a lot of manpower and time; the additional cooling component assembly process not only prolongs the production cycle, but may also lead to a further decrease in the bonding accuracy between the cooling components and the coil due to assembly errors, ultimately affecting the overall cooling efficiency of the magnet. These problems are particularly prominent in the production of irregularly shaped coils such as saddle-shaped coils, whose special skeleton structure makes the bonding of cooling components more difficult. Traditional processes can no longer meet the requirements of magnet coils for assembly accuracy and cooling effect, and an optimized technical solution is urgently needed to solve the current predicament. Summary of the Invention

[0004] This invention provides a magnet impregnation frame and method, which can solve the problem that in the prior art, the shape characteristics of the cooling component itself are difficult to match the surface contour of the coil, and the resin has limited fluidity. This installation method often fails to achieve a tight fit between the two, which directly leads to an unsatisfactory cooling effect of the coil and affects the overall working performance of the magnet.

[0005] A magnet impregnation frame includes a fixed cylinder, a first cooling conductor, a coil frame, a second cooling conductor, and a sealing structure. The first cooling conductor is fitted onto the outer surface of the fixed cylinder, forming an inner cooling path. The coil frame is disposed on the outer side of the first cooling conductor and is used to wind a magnet coil. The second cooling conductor is fitted onto the outer surface of the coil frame, forming an outer cooling path. The sealing structure is disposed on the fixed cylinder and is used to seal the fixed cylinder, the first cooling conductor, the coil frame, and the second cooling conductor together to form a sealed impregnation cavity. The first and second cooling conductors are configured to be integrally cured with the magnet coil wound on the coil frame by resin vacuum pressure impregnation within the sealed impregnation cavity.

[0006] The magnet impregnation skeleton provided by this invention has, but is not limited to, the following beneficial effects compared to the prior art: This magnet impregnation frame forms a sealed impregnation cavity by pre-installing the first and second cooling components on the fixed cylinder and coil frame. This allows the resin to simultaneously penetrate into the interior of the magnet coil and the interfaces of each component during vacuum pressure impregnation through capillary action. This eliminates the microscopic gaps caused by traditional post-assembly methods and achieves a seamless fit between the cooling components and the coil. The rigid sealing system formed by the sealing structure and the fixed cylinder, combined with the overall composite structure formed by resin curing, provides strong external constraints and support for the magnet coil wound on the coil frame. This effectively suppresses the frame deformation caused by electromagnetic force and thermal stress during coil winding, processing, and operation, ensuring the stability and reliability of the magnet's long-term operation.

[0007] Furthermore, the first cooling component includes a first cooling plate and a first connecting plate connected to its end. Both the first cooling plate and the first connecting plate are provided with first mounting holes. The first cooling plate is detachably connected to the fixed cylinder through the first mounting holes, and the first connecting plate is detachably connected to the second cooling component through the first mounting holes.

[0008] Furthermore, the second cooling component includes a second cooling plate and a second connecting plate connected to its end. The second connecting plate has a second mounting hole that matches the first mounting hole. The second cooling plate is attached to the outer surface of the coil frame. The second cooling plate is detachably connected to the first connecting plate by bolts.

[0009] Furthermore, the coil frame includes a straight edge portion and an arc portion connecting the two ends of the straight edge portion, and both the straight edge portion and the arc portion are provided with a plurality of first fixing holes.

[0010] Furthermore, both the straight edge and the arc end are provided with a fixing groove, a fixing plate is provided inside the fixing groove, and a second fixing hole is provided inside both the fixing groove and the fixing plate.

[0011] Furthermore, the coil frame is provided with a wire outlet groove, and the first connecting plate is provided with a wire outlet that matches the wire outlet groove.

[0012] Furthermore, the sealing structure includes a silicone pad and an encapsulation housing. The silicone pad is attached to the axial surface of the upper and lower flanges of the fixed cylinder and the outer surface of the second cooling component. The encapsulation housing is wrapped around the outside of the silicone pad.

[0013] Furthermore, two coil frames are attached to the fixed cylinder, and a first cooling element and a second cooling element are attached to the top and bottom of each coil frame.

[0014] A method for impregnating a magnet, the method comprising: S1. Install the first cooling component on the surface of the fixed cylinder, install the coil frame with the magnet coil wound on the surface of the first cooling component, and then install the second cooling component on the surface of the coil frame. S2. The assembled skeleton is sealed as a whole through a sealing structure to form a closed impregnation cavity; S3. Send the sealed impregnation cavity into the vacuum heating furnace. After the vacuum degree and temperature in the vacuum heating furnace reach the preset requirements, inject the mixed resin into the sealed impregnation cavity so that the resin can simultaneously penetrate into the inside of the magnet coil, the interface between the first cooling component and the coil frame, and the interface between the second cooling component and the coil frame. S4. The resin is cured to form an integrated structure that combines the cooling component, magnet coil, and coil frame.

[0015] Furthermore, in step S3, the temperature is controlled by a program, and the temperature curve includes a heat preservation-heating-cooling-heat preservation stage; before the sealed impregnation cavity is sent into the vacuum heating furnace, the sealed cavity is first subjected to positive pressure leak detection, and after confirming that there is no leak, negative pressure leak detection is performed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a magnet impregnation skeleton according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a magnet impregnation skeleton according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a magnet impregnation skeleton according to an embodiment of the present invention. Figure 3 ; Figure 4 This is a cross-sectional view of a magnet impregnation skeleton according to an embodiment of the present invention; Figure 5 for Figure 4 Schematic diagram of the structure of the inner packaging shell; Figure 6 for Figure 1A schematic diagram of the structure of the coil frame; Figure 7 for Figure 1 Schematic diagram of the structure of the first cooling component; Figure 8 for Figure 6 A magnified view of a section at point A in the middle; Figure 9 for Figure 6 A magnified view of a section at point B in the middle; Figure 10 This is a schematic diagram of the temperature control curve for resin gelation and curing in one embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Fixing cylinder; 2. First cooling component; 3. Second cooling component; 4. Coil frame; 5. Sealing structure; 6. Outlet groove; 7. Outlet port; 201. First cooling plate; 202. First connecting plate; 203. First mounting hole; 31. Second cooling plate; 32. Second connecting plate; 33. Second mounting hole; 41. Straight edge; 42. Arc-shaped part; 43. First fixing hole; 44. Fixing groove; 45. Fixing plate; 46. Second fixing hole; 51. Silicone pad; 52. Encapsulation shell; 521. Injection tube; 522. Outlet tube; 523. First connecting tube; 524. Second connecting tube. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] like Figure 1-2 As shown, an embodiment of the present invention provides a magnet impregnation frame, including a fixed cylinder 1, a first cooling conductor 2, a coil frame 4, a second cooling conductor 3, and a sealing structure 5. The first cooling conductor 2 is attached to the outer surface of the fixed cylinder 1, forming an inner cooling path; the coil frame 4 is disposed on the outer side of the first cooling conductor 2, and the coil frame 4 is used to wind a magnet coil; the second cooling conductor 3 is attached to the outer surface of the coil frame 4, and is used to form an outer cooling path; the sealing structure 5 is disposed on the fixed cylinder 1, and is used to seal the fixed cylinder 1, the first cooling conductor 2, the coil frame 4, and the second cooling conductor 3 together to form a sealed impregnation cavity; wherein, the first cooling conductor 2 and the second cooling conductor 3 are configured to be able to be integrally cured with the magnet coil wound on the coil frame 4 by resin vacuum pressure impregnation in the sealed impregnation cavity.

[0025] In this embodiment, by pre-installing the first cooling component 2 and the second cooling component 3 on the fixed cylinder 1 and the coil frame 4 to form a sealed impregnation cavity, the resin can simultaneously penetrate into the interior of the magnet coil and the interfaces of each component through capillary action during vacuum pressure impregnation, completely eliminating the microscopic gaps caused by the traditional post-assembly method and achieving a seamless fit between the cooling component and the coil in all directions. By forming an inner path with the first cooling component and an outer path with the second cooling component, together with the integrated curing structure, a highly efficient and synergistic three-dimensional cooling network is constructed, which significantly improves the overall thermal conductivity and temperature uniformity of the magnet. The rigid seal formed by the sealing structure 5 and the fixed cylinder 1, combined with the overall composite structure formed by resin curing, provides strong external constraints and support for the magnet coil wound on the coil frame 4, effectively suppressing the frame deformation caused by electromagnetic force and thermal stress during the winding, processing and operation of the coil, and ensuring the stability and reliability of the magnet's long-term operation.

[0026] Specifically, firstly, the first cooling conductive component 2 is precisely fitted onto the outer surface of the fixed cylinder 1. Then, the coil frame 4, on which the magnet coil is wound, is fitted onto the outer side of the first cooling conductive component 2. Finally, the second cooling conductive component 3 is tightly fitted onto the surface of the magnet coil on the coil frame 4. The fixed cylinder 1, the first cooling conductive component 2, the coil frame 4, and the second cooling conductive component 3 are sealed together by the sealing structure 5, creating a leak-free, sealed impregnation cavity. During the vacuum pressure impregnation process, the resin, utilizing the capillary permeation characteristics under vacuum conditions, can not only fully penetrate into the tiny gaps inside the magnet coil, but also completely fill the interface between the first cooling conductive component 2 and the coil frame 4, the interface between the second cooling conductive component 3 and the coil frame 4, and even penetrate into the deep structures such as the first fixing hole 43 and the second fixing hole 46 of the coil frame 4. This completely eliminates the microscopic gaps caused by component misalignment and assembly stress in traditional post-assembly methods, ultimately achieving a seamless, all-around fit between the first cooling conductive component 2, the second cooling conductive component 3, and the magnet coil, laying the foundation for heat conduction and structural stability.

[0027] Secondly, the first cooling component 2 serves as the core of the inner cooling path, with its first cooling plate 201 tightly fitted to the fixed cylinder 1, quickly dispersing the heat generated by the magnet coil to the fixed cylinder 1. The second cooling component 3, as the key to the outer cooling path, has its second cooling plate 31 directly attached to the outer surface of the magnet coil, directly dissipating heat from the coil surface, forming a two-way cooling pattern of inner conduction and outer heat dissipation. More importantly, the integrated structure of the cooling component, magnet coil, and coil frame 4 formed after resin curing eliminates the need for heat conduction to cross any interface gaps. Heat can be directly transferred from the inside of the coil to the cooling component through the cured resin, avoiding thermal resistance losses caused by interface gaps in traditional assembly. This not only significantly improves the overall thermal conductivity of the magnet but also ensures the uniformity of temperature distribution in all areas of the coil, effectively avoiding the impact of local overheating on magnet performance.

[0028] Finally, the encapsulation shell 52 in the sealing structure 5 serves as a high-strength rigid component, wrapping around the silicone pad 51 and locking it to the fixing cylinder 1. Through compression, it provides a stable external constraint for the first cooling component 2, the coil frame 4, and the second cooling component 3, preventing displacement of the components during subsequent processes or operation. After the resin cures, it forms a tightly integrated composite structure with the cooling component, the coil, and the coil frame 4. The straight edge 41 and the arc part 42 of the coil frame 4 are reinforced by splicing with the fixing plate 45, giving the entire structure extremely strong resistance to deformation.

[0029] like Figure 1 and Figure 7As shown, the first cooling component 2 includes a first cooling plate 201 and a first connecting plate 202 connected to its end. Both the first cooling plate 201 and the first connecting plate 202 are provided with first mounting holes 203. The first cooling plate 201 is detachably connected to the fixed cylinder 1 through the first mounting holes 203, and the first connecting plate 202 is detachably connected to the second cooling component 3 through the first mounting holes 203.

[0030] In this embodiment, the first cooling plate 201 can be precisely and detachably connected to the fixed cylinder 1 through the first mounting hole 203. This ensures a tight fit between the first cooling plate 201 and the outer surface of the fixed cylinder 1, providing a stable foundation for the internal cooling path, while also offering the convenience of flexible assembly and disassembly, facilitating early assembly and debugging as well as later maintenance. The first connecting plate 202 can be detachably connected to the second cooling component 3 through the first mounting hole 203, enabling precise alignment between the first cooling component 2 and the second cooling component 3. This ensures the coordinated connection of the internal and external dual cooling paths, avoiding cooling interruption or efficiency reduction due to connection deviation. At the same time, this unified mounting hole simplifies the assembly process, reduces component adaptation errors, and indirectly ensures the fitting accuracy of the cooling component with the coil frame 4 and the magnet coil during subsequent vacuum impregnation, further enhancing the cooling coordination and deformation resistance of the integrated structure.

[0031] like Figure 1 and Figure 7 As shown, the second cooling component 3 includes a second cooling plate 31 and a second connecting plate 32 connected to its end. The second connecting plate 32 has a second mounting hole 33 that matches the first mounting hole 203. The second cooling plate 31 is attached to the outer surface of the coil frame 4. The second cooling plate 31 is detachably connected to the first connecting plate 202 by bolts.

[0032] In this embodiment, the second cooling plate 31 is directly attached to the outer surface of the coil frame 4, which maximizes the contact area to construct an efficient outer cooling path, providing a uniform heat dissipation foundation for the magnet coil. At the same time, the tight fit creates a prerequisite for resin penetration to eliminate gaps during subsequent vacuum impregnation. The second connecting plate 32 has a second mounting hole 33 that matches the first mounting hole 203, and bolts are used to achieve a detachable connection with the first connecting plate 202. This ensures the precise alignment of the second cooling component 3 and the first cooling component 2, so that the inner and outer dual cooling paths form a synergistic conduction system, avoiding the reduction of cooling efficiency due to connection deviation. It also has the convenience of flexible disassembly and assembly, which facilitates the adjustment of the fit between the second cooling plate 31 and the coil frame 4 during the initial assembly, as well as subsequent maintenance and replacement.

[0033] like Figure 1 and Figure 6 As shown, the coil frame 4 includes a straight edge portion 41 and an arc portion 42 connected to both ends of the straight edge portion 41. Both the straight edge portion 41 and the arc portion 42 are provided with a plurality of first fixing holes 43.

[0034] In this embodiment, the coil frame 4 adopts an integrated structure with a straight edge 41 and two rounded ends 42. This structure not only accurately adapts to the winding requirements of irregularly shaped magnet coils such as saddle-shaped ones, resulting in a regular outline after coil winding, but also enhances the structural strength of the frame itself through the transition design between the straight edge and the rounded ends, reducing the risk of deformation during winding and impregnation. At the same time, the multiple first fixing holes 43 opened on the straight edge 41 and the rounded ends 42 can provide a positioning reference when winding the magnet coil, ensuring the uniformity and accuracy of coil winding.

[0035] like Figure 6 and Figure 8 As shown, both the straight edge portion 41 and the arc portion 42 have a fixing groove 44 at their ends, a fixing plate 45 is provided inside the fixing groove 44, and a second fixing hole 46 is provided inside both the fixing groove 44 and the fixing plate 45.

[0036] In this embodiment, the fixing grooves 44 provided at the ends of the straight edge 41 and the arc-shaped part 42 provide a precise mounting and positioning space for the fixing plate 45, ensuring that the fixing plate 45 can fit tightly against the contour of the splice and avoid connection gaps caused by installation misalignment. The fixing plate 45 is locked with the fasteners through the fixing grooves 44 and its own second fixing holes 46, which greatly enhances the splice firmness of the straight edge 41 and the arc-shaped part 42 and significantly improves the overall structural rigidity of the skeleton.

[0037] like Figure 6 and Figure 9 As shown, the coil frame 4 has a wire outlet groove 6, and the first connecting plate 202 has a wire outlet 7 that matches the wire outlet groove 6. The wire outlet groove 6 of the coil frame 4 and the wire outlet 7 of the first connecting plate 202 are precisely matched in shape and size. The lead wire can be neatly arranged along the wire outlet groove 6 and then pass through the wire outlet 7 point-to-point. This precise matching means that when the lead wire passes through, only the gap between the wire outlet 7 and the lead wire needs to be partially filled to maintain the overall airtightness of the sealing structure 5, avoiding air leakage in the sealed impregnation cavity due to the lead wire passing through, and ensuring the vacuum environment for resin penetration during vacuum impregnation.

[0038] In this embodiment, the lead wires of the magnet coil wound on the coil frame 4 are provided with a dedicated receiving and guiding channel through the lead wire groove 6, ensuring that the lead wires are arranged neatly. The lead wires can be accurately passed through and positioned through the lead wire outlet 7 on the first connecting plate 202 that matches the lead wire groove 6, allowing the lead wires to extend smoothly from the inside of the sealed impregnation cavity to the outside. This avoids damaging the sealed environment formed by the sealing structure 5 when the lead wires pass through, ensuring the sealing reliability and resin penetration effect during vacuum impregnation, and does not affect the continuity of the cooling path of the first cooling component 2.

[0039] like Figure 3 and Figure 4 As shown, the sealing structure 5 includes a silicone pad 51 and an encapsulation housing 52. The silicone pad 51 is attached to the axial surface of the upper and lower flanges of the fixed cylinder 1 and the outer surface of the second cooling component 3. The encapsulation housing 52 is wrapped around the outside of the silicone pad 51.

[0040] In this embodiment, the silicone pad 51, with its elastic properties, precisely adheres to the axial surfaces of the upper and lower flanges of the fixed cylinder 1 and the outer surface of the second cooling component 3, which can fully fill the tiny gaps at the joints of the components. At the same time, it adapts to the surface contours of the fixed cylinder 1 and the second cooling component 3, avoiding sealing dead angles caused by rigid contact. The encapsulation shell 52 is wrapped around the silicone pad 51, and the silicone pad 51 undergoes elastic deformation through compression. This not only strengthens the overall locking effect on the fixed cylinder 1, the first cooling component 2, the coil frame 4, and the second cooling component 3, allowing the second cooling component 3 to fit more tightly against the coil frame 4, but also forms a robust external protection to resist pressure changes during vacuum impregnation and prevent sealing failure.

[0041] For details, please refer to Figure 5 The lower part of the encapsulation housing 52 is provided with a plurality of dispensing tubes 521, and the upper part of the encapsulation housing 52 is provided with a plurality of dispensing tubes 522. The dispensing tubes 521 are connected to a first connecting tube 523, and the dispensing tubes 522 are connected to a second connecting tube 524.

[0042] By using lower circumferential glue injection and upper circumferential glue dispensing, and with the stable connection between the first connecting pipe 523 and the resin mixer, resin can be uniformly injected into the sealed impregnation cavity along the circumference of the encapsulation shell 52. This avoids the problems of uneven resin flow and local accumulation caused by single-point glue injection. It is especially suitable for the irregular contour formed by splicing the straight edge 41 and the arc part 42 of the coil frame 4, ensuring that the resin can penetrate into the interface between the first cooling component 2 and the coil frame 4, the second cooling component 3 and the coil frame 4, the inside of the magnet coil, and the fine structures such as the first fixing hole 43 and the second fixing hole 46 of the coil frame 4, completely eliminating the bonding gap. At the same time, the upper circumferential glue dispensing pipe 522 and the second connecting pipe 524 can simultaneously discharge air and excess resin in the cavity. Combined with the vacuum environment of the vacuum heating furnace, it effectively avoids the generation of air bubbles during the resin filling process, preventing residual air bubbles from affecting the bonding strength of the integrated structure and the continuity of the cooling path.

[0043] Preferably, there are four glue injection tubes 521 and four glue dispensing tubes 522, and they correspond one-to-one.

[0044] like Figure 1 and Figure 3 As shown, two coil frames 4 are attached to the fixed cylinder 1, and a first cooling element 2 and a second cooling element 3 are attached to the top and bottom of each coil frame 4.

[0045] In this embodiment, two coil frames 4 are symmetrically attached to the fixed cylinder 1, which not only makes full use of the bearing space of the fixed cylinder 1 to realize the synchronous assembly and impregnation production of dual coils, greatly improving production efficiency, but also ensures the stress balance of the overall structure through symmetrical layout, reducing the eccentric deformation that may occur during the assembly of a single coil; at the same time, the top and bottom of each coil frame 4 are fitted with a first cooling component 2 and a second cooling component 3, so that each coil can form an independent and complete internal and external dual cooling path, ensuring that the cooling efficiency of the two coils is uniform and consistent, and avoiding the problem of uneven heat dissipation in some areas.

[0046] Another embodiment of the present invention provides a magnet impregnation method, comprising: S1, installing a first cooling conductive element 2 on the surface of a fixed cylinder 1, installing a coil frame 4 with a magnet coil wound on the surface of the first cooling conductive element 2, and then installing a second cooling conductive element 3 on the surface of the coil frame 4; S2, sealing the assembled frame as a whole through a sealing structure 5 to form a sealed impregnation cavity; S3, sending the sealed impregnation cavity into a vacuum heating furnace, and after the vacuum degree and temperature in the vacuum heating furnace reach the preset requirements, injecting the mixed resin into the sealed impregnation cavity, so that the resin simultaneously penetrates into the interior of the magnet coil, the interface between the first cooling conductive element 2 and the coil frame 4, and the interface between the second cooling conductive element 3 and the coil frame 4; S4, allowing the resin to solidify, forming an integrated structure combining the cooling conductive element, the magnet coil, and the coil frame 4.

[0047] In this embodiment, the first cooling component 2 is first assembled onto the surface of the fixed cylinder 1, then the coil frame 4 for winding the magnet coil is attached to the outside of the first cooling component 2, and finally the second cooling component 3 is assembled onto the surface of the coil frame 4, achieving precise alignment and attachment of each component, laying the foundation for subsequent integrated curing; the fixed cylinder 1, the first cooling component 2, the coil frame 4, and the second cooling component 3 are sealed together by the sealing structure 5 to form a sealed impregnation cavity, ensuring the airtightness of the vacuum impregnation environment; the sealed cavity is sent into a vacuum heating furnace, and after the vacuum degree and temperature reach the standard, the mixed resin is injected, allowing the resin to fully penetrate the magnet. The interfaces between the coil interior and the first cooling component 2 and the coil frame 4, and between the second cooling component 3 and the coil frame 4, utilize capillary action in a vacuum environment to eliminate all minute gaps. Through resin curing, an integrated structure is formed that combines the cooling component, the magnet coil, and the coil frame 4. The entire process avoids the fitting deviation and resin overflow problems caused by traditional impregnation and assembly. Furthermore, through the synergistic cooperation of each structure, it ensures the smooth connection of the dual cooling paths and the robustness of the integrated structure, significantly improving the magnet's cooling efficiency and resistance to deformation. At the same time, it simplifies the process steps, shortens the production cycle, and ensures the stability of production quality.

[0048] Specifically, through the stable connection of multiple first connecting pipes 523 with the resin mixer, the resin can be uniformly injected into the sealed impregnation cavity along the circumference of the encapsulation shell 52, and the upper circumferential dispensing pipe 522 and the second connecting pipe 524 can simultaneously discharge air and excess resin from the cavity.

[0049] In step S3, before the sealed impregnation chamber is sent into the vacuum heating furnace, it undergoes a dual testing process of positive pressure leak detection followed by negative pressure leak detection. This accurately verifies the sealing reliability of the sealing structure 5, thoroughly checks for potential leaks at the joints of the fixed cylinder 1, the first cooling component 2, the coil frame 4, and the second cooling component 3, and prevents pressure leakage during vacuuming of the vacuum heating furnace. This provides a stable vacuum environment for resin penetration. The chamber is then pushed into the vacuum heating furnace, which is evacuated. The mixer begins mixing the materials, and once the vacuum and temperature are reached, the impregnation process begins. After the entire coil is impregnated, the entire magnet impregnation frame is removed, and the outer encapsulation shell 52 and silicone pad 51 are removed.

[0050] Specifically, in the dual detection process of positive and negative pressure leak detection, multiple sets of first connecting pipes 523 and second connecting pipes 524 can be connected, with only one set of pipes participating in leak detection. This single set of pipes not only allows for rapid leak detection but also reduces the number of pipe interfaces, thereby lowering the risk of misjudgment due to pipe sealing failure. It enables more accurate verification of the sealing of core sealing areas such as the fit between the encapsulation shell 52 and the silicone pad 51, and the connection sealing between each cooling component and the coil frame 4, ensuring the true sealing performance of the sealed impregnation cavity and providing a reliable prerequisite for the uniform penetration of resin in subsequent vacuum impregnation. After connection, only one set of pipes needs pressure control and monitoring, simplifying the pipe connection and parameter adjustment process for leak detection. Whether it's the pressure input during positive pressure leak detection or the vacuum extraction during negative pressure leak detection, both can be centrally operated through a single set of pipes, reducing the cumbersome steps of parallel operation of multiple pipes, lowering the probability of human error, significantly improving the overall efficiency of leak detection, and ensuring the progress of the magnet impregnation process.

[0051] The vacuum heating furnace provides a vacuum environment, ensuring that there are no other impurities contaminating the epoxy resin during melting and impregnation. At the same time, the vacuum environment can keep the temperature of the epoxy resin constant during impregnation, ensuring that the coil can be fully impregnated with resin at its melting point.

[0052] In step S3, the temperature is controlled by a program, and the temperature curve includes a heat preservation-heating-cooling-heat preservation stage.

[0053] In this embodiment, the temperature is simultaneously controlled by a programmed process that includes a heat preservation-heating-cooling-heat preservation stage. The heat preservation stage can improve the fluidity of the resin, helping it to fully penetrate into the interior of the magnet coil, the interface between the first cooling component 2 and the coil frame 4, and the interface between the second cooling component 3 and the coil frame 4. The cooling stage can guide the resin to solidify smoothly. The heat preservation stages at both ends ensure that the temperature of each component is uniform, avoiding uneven resin solidification or structural stress concentration caused by local temperature differences.

[0054] For details, please refer to Figure 10 The temperature control curves for resin gelation and curing are shown. A uniform reaction from resin gelation to curing is achieved through "multi-stage temperature control," which can be analyzed from the following dimensions: 1. Stage 1: Low-temperature gelation Heating process: Increase the temperature from 40℃ to 90±5℃ at a rate of 5±1℃ / h. Slow heating avoids uneven local reaction of the resin due to thermal shock.

[0055] Specifically, a slow heating rate ensures uniform heat transfer within the resin, preventing premature gelation or uneven curing due to localized overheating. This allows the resin to fully penetrate the interfaces between the first cooling component 2 and the coil frame 4, the second cooling component 3 and the coil frame 4, and the interior of the magnet coil, ultimately achieving a seamless fit between the cooling component and the coil. This lays the foundation for subsequent cooling efficiency and structural stability.

[0056] Insulation process: Keep at 90±5℃ for 10-12 hours. During this stage, the resin undergoes a preliminary gelation reaction, forming an initial network structure, which lays the foundation for subsequent high-temperature curing.

[0057] Specifically, at a low temperature of 90±5℃, the resin undergoes a controllable initial pre-gelation reaction, forming a uniform initial cross-linked network. A holding time of 10-12 hours ensures that this network fully extends at the interface between the coil frame 4, the magnet coil, and the cooling component, providing anchor points for subsequent high-temperature curing and deep cross-linking, significantly improving the bonding strength of the integrated structure and effectively suppressing the deformation risk of the coil frame 4.

[0058] 2. Stage Two: High-Temperature Curing

[0059] Heating process: The temperature is increased from 90±5℃ to 130±5℃ at a rate of 5±1℃ / h. Stable heating ensures the continuity of the resin crosslinking reaction.

[0060] Specifically, the slow heating rate of 5±1℃ / h ensures a stable release of the heat of reaction, allowing the crosslinking reaction to proceed continuously and gently, laying the foundation for the formation of a high-quality polymer network. The slow heating rate gives the resin molecular chains enough time to stretch and orient themselves, and this ordered microstructure helps to improve the mechanical strength, heat resistance and dimensional stability of the final cured product.

[0061] Insulation process: Maintain at 130±5℃ for 13-17 hours. During this stage, the resin undergoes deep cross-linking, forming a dense, high-strength cured structure, which improves mechanical properties and thermal stability. Specifically, prolonged heat preservation at a high temperature (130±5℃) provides the resin with sufficient energy and time to complete the cross-linking reaction as completely as possible. This significantly improves the resin's glass transition temperature, mechanical strength, and chemical stability, and makes it more able to withstand the enormous electromagnetic forces and thermal cycling shocks during magnet operation.

[0062] 3. Stage Three: Cooling and Shaping

[0063] Cooling process: The temperature is reduced from 130±5℃ at a rate of 5±1℃ / h, and finally cooled to room temperature. Uniform cooling can prevent the resin from cracking and deforming due to thermal stress, ensuring the integrity of the structure after curing.

[0064] Specifically, uniform cooling avoids stress concentration caused by thermal expansion and contraction of the resin, preventing cracks, delamination, or peeling from the component after curing. This ensures the continuity of the cooling path (eliminating cooling failure due to resin cracks) and the stability of the skeleton structure (eliminating the risk of delamination leading to increased deformation), ultimately improving the long-term operational reliability of the magnet.

[0065] By using a programmed temperature control system of slow heating, segmented heat preservation, and uniform cooling, the fullness and uniformity of the resin gelation and curing reaction are ensured, while avoiding thermal stress defects. Ultimately, the resin forms a high-performance cured structure, suitable for scenarios with high requirements for material strength and sealing, such as magnet impregnation.

[0066] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A magnet-impregnated skeleton, characterized in that, include: Fixed cylinder (1); The first cooling component (2) is attached to the outer surface of the fixed cylinder (1) to form an inner cooling path; A coil frame (4) is disposed on the outside of the first cooling conductor (2), and the coil frame (4) is used to wind a magnet coil; The second cooling component (3) is attached to the outer surface of the coil frame (4) to form an outer cooling path; A sealing structure (5) is provided on the fixed cylinder (1) to seal the fixed cylinder (1), the first cooling element (2), the coil frame (4) and the second cooling element (3) together to form a sealed impregnation cavity; The first cooling element (2) and the second cooling element (3) are configured to be integrated into a solidified structure by resin vacuum pressure impregnation in the sealed impregnation cavity and the magnet coil wound on the coil frame (4).

2. The magnet impregnation skeleton as described in claim 1, characterized in that, The first cooling component (2) includes a first cooling plate (201) and a first connecting plate (202) connected to its end. Both the first cooling plate (201) and the first connecting plate (202) are provided with a first mounting hole (203). The first cooling plate (201) is detachably connected to the fixed cylinder (1) through the first mounting hole (203), and the first connecting plate (202) is detachably connected to the second cooling component (3) through the first mounting hole (203).

3. The magnet impregnation skeleton as described in claim 1, characterized in that, The second cooling component (3) includes a second cooling plate (31) and a second connecting plate (32) connected to its end. The second connecting plate (32) has a second mounting hole (33) that matches the first mounting hole (203). The second cooling plate (31) is attached to the outer surface of the coil frame (4). The second cooling plate (31) is detachably connected to the first connecting plate (202) by bolts.

4. The magnet impregnation skeleton as described in claim 1, characterized in that, The coil frame (4) includes a straight edge (41) and an arc part (42) connected to both ends of the straight edge (41). Both the straight edge (41) and the arc part (42) are provided with a plurality of first fixing holes (43).

5. The magnet impregnation frame as described in claim 4, characterized in that, The straight edge (41) and the arc part (42) are both provided with a fixing groove (44), and a fixing plate (45) is provided inside the fixing groove (44). The fixing groove (44) and the fixing plate (45) are both provided with a second fixing hole (46).

6. The magnet impregnation frame as described in claim 2, characterized in that, The coil frame (4) has a wire outlet groove (6), and the first connecting plate (202) has a wire outlet (7) that matches the wire outlet groove (6).

7. The magnet impregnation skeleton as described in claim 1, characterized in that, The sealing structure (5) includes a silicone pad (51) and a packaging shell (52). The silicone pad (51) is attached to the axial surface of the upper and lower flanges of the fixed cylinder (1) and the outer surface of the second cooling component (3). The packaging shell (52) is wrapped around the outside of the silicone pad (51).

8. The magnet impregnation skeleton as described in claim 1, characterized in that, Two coil frames (4) are attached to the fixed cylinder (1), and a first cooling element (2) and a second cooling element (3) are attached to the top and bottom of each coil frame (4).

9. A magnet impregnation method, based on the apparatus as described in any one of claims 1 to 8, characterized in that, The method includes: S1. Install the first cooling component (2) on the surface of the fixed cylinder (1), install the coil frame (4) with the magnet coil wound on the surface of the first cooling component (2), and then install the second cooling component (3) on the surface of the coil frame (4). S2. The assembled skeleton is sealed by the sealing structure (5) to form a closed impregnation cavity; S3. Send the sealed impregnation cavity into the vacuum heating furnace. After the vacuum degree and temperature in the vacuum heating furnace reach the preset requirements, inject the mixed resin into the sealed impregnation cavity so that the resin can simultaneously penetrate into the inside of the magnet coil, the interface between the first cooling component (2) and the coil frame (4), and the interface between the second cooling component (3) and the coil frame (4). S4. The resin is cured to form an integrated structure combining the cooling component, the magnet coil and the coil frame (4).

10. The magnet impregnation method as described in claim 9, characterized in that, In step S3, the temperature is controlled by a program, and the temperature curve includes a heat preservation-heating-cooling-heat preservation stage; before the sealed impregnation cavity is sent into the vacuum heating furnace, the sealed cavity is first tested for leaks under positive pressure, and after confirming that there are no leaks, a negative pressure test is performed.

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