Locking device

Abstract

The utility model discloses a locking device, which is used for fixing a high-voltage winding prefabricated part in an injection mold by locking an outgoing line terminal so as to inject and mold a high-voltage insulating layer on the periphery of the high-voltage winding prefabricated part to obtain a high-voltage winding, and comprises a fixed block, an upper insert and a lower insert, the fixing block is used for being connected with the outgoing line terminal and wrapping the mounting surface of the outgoing line terminal, and the upper insert and the lower insert are matched and butted and then wrap the peripheral surface of the fixing block and are used for being connected with an injection mold. The locking device can lock the wire outlet terminal when the high-voltage winding is formed, and the situation that the wire outlet terminal cannot be used due to the fact that a forming material enters the wire outlet terminal is prevented.

Description

Technical Field

[0001] This application relates to the field of dry-type transformer technology, and in particular to a locking device. Background Technology

[0002] The high-voltage insulation layer of the high-voltage winding of dry-type transformers is mostly formed by casting or injection molding. One end of the high-voltage winding terminal is usually provided with a threaded hole for connecting external power components. During the high-voltage insulation layer molding process, the threaded hole needs to be tightly sealed with the mold cavity to prevent the molding material from flowing into the threaded hole and causing the terminal to fail.

[0003] Currently, threaded through holes are typically pre-drilled in the mold. Bolts are screwed into the threaded holes of the lead-out terminals and the mold cavity to secure the lead-out terminals to the mold cavity before the high-voltage winding is formed. However, the process of screwing in bolts to secure the lead-out terminals to the mold cavity can only be performed after the mold is opened at the forming station, which is time-consuming, increases the production cycle, and raises manufacturing costs. Furthermore, the bolts cannot completely cover the mounting surface of the lead-out terminals, making them susceptible to damage when the mold is closed, thus affecting product quality. Utility Model Content

[0004] In view of the shortcomings of the prior art, the main purpose of this application is to provide a locking device that can lock the outgoing terminals during the high-voltage winding molding process, preventing the molding material from entering the outgoing terminals and rendering them unusable.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is: a locking device for fixing a high-voltage winding preform in an injection mold by locking the outgoing terminal, so as to inject and form a high-voltage insulation layer on the outer periphery of the high-voltage winding preform to obtain a high-voltage winding. The locking device includes a fixing block, an upper insert block and a lower insert block. The fixing block is used to connect the outgoing terminal and cover the mounting surface of the outgoing terminal. The upper insert block and the lower insert block are mated and then cover the outer periphery of the fixing block for connecting the injection mold.

[0006] The fixing block includes a connecting part and a fixing part connected together. The connecting part is used to connect the outgoing terminal. Both the connecting part and the fixing part are cylindrical in shape, and the diameter of the connecting part is smaller than the diameter of the fixing part, so that a stepped surface is formed between the fixing part and the connecting part. The stepped surface is used to cover the mounting surface.

[0007] One end of the outgoing terminal is provided with a connection hole, which is a threaded hole, and the outer peripheral surface of the connecting part is provided with an external thread that matches and connects with the connection hole.

[0008] The length of the connecting part is less than or equal to the length of the threaded hole.

[0009] The fixing part has an annular groove on its outer periphery in the middle, and the cross section of the annular groove along the axial direction of the fixing part is V-shaped.

[0010] The end of the fixing part away from the connecting part is provided with a mounting groove, which is used to lock the fixing block onto the outgoing terminal by mechanical tools. The mounting groove is an internal hexagonal groove.

[0011] The fixing part has at least one through hole on the outer periphery of the end away from the connecting part, which is used to lock the fixing block on the outgoing terminal by mechanical tools. The through hole is arranged radially along the fixing part.

[0012] The lower insert has a first groove, a first protrusion, and a second protrusion. The first groove is used to accommodate part of the fixing block, and the first and second protrusions are used to match and connect with the annular groove.

[0013] The upper insert has a second groove, a third protrusion, and a groove. The second groove is used to accommodate part of the fixing block, the third protrusion is used to match and connect with the annular groove, and the groove is used to match and connect with the second protrusion.

[0014] The second front face of the upper inlay and the first front face of the lower inlay are flush with the stepped surface of the fixed block.

[0015] Both the upper and lower inserts have a fourth protrusion on the side away from the fixed block, which is used to match and connect with the injection mold.

[0016] The beneficial effects of this application are as follows: The locking device of this application can pre-lock the output terminal through the separate fixing block, so that the high voltage winding preform connected to the fixing block can be placed directly into the injection mold cavity at the molding station to start the molding process. The operation is simple, the production cycle is shortened, and the manufacturing cost is reduced. By covering the mounting surface of the output terminal with the fixing block, the injection molding material can be prevented from seeping into the interior of the output terminal and causing it to fail. By using the lower insert and the upper insert to cover the entire fixing block, the possibility of the mounting surface of the output terminal being bumped or damaged by the injection mold can be effectively reduced, thereby ensuring product quality.

[0017] Meanwhile, this application uses the cooperation of the lower insert and the upper insert to precisely position the fixing block and the high voltage winding preform connected thereto in the injection mold cavity, ensuring the accuracy and stability of the position of the high voltage winding preform during the high voltage winding molding process, thereby guaranteeing the quality of the product.

[0018] Furthermore, both the lower and upper inserts in this application are detachable structures. When an insert is damaged, production can continue simply by replacing the insert, thereby improving production efficiency and avoiding cost waste caused by equipment downtime. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a front view of a dry-type transformer 10 according to one embodiment of this application;

[0021] Figure 2 This is a top view of a dry-type transformer 10 according to one embodiment of this application;

[0022] Figure 3 This is a front view of the assembled iron core 110 according to one embodiment of this application;

[0023] Figure 4 yes Figure 2 Enlarged view of point G in the middle;

[0024] Figure 5 This is a three-dimensional schematic diagram of the winding body 1310 according to an embodiment of this application;

[0025] Figure 6 This is a three-dimensional schematic diagram of a high-voltage coil 1320 wound on a winding body 1310 according to an embodiment of this application;

[0026] Figure 7 This is a perspective view of the winding body 1310 according to another embodiment of this application;

[0027] Figure 8 yes Figure 7 A three-dimensional schematic diagram of the winding component 2314 in the diagram;

[0028] Figure 9 This is a perspective view of the high-voltage winding 130 according to one embodiment of this application;

[0029] Figure 10 This is a partial cross-sectional view of the high-voltage winding 130 according to one embodiment of this application;

[0030] Figure 11 This is a perspective view of the connection between the high-voltage winding 130 and the locking device 100 in one embodiment of this application;

[0031] Figure 12 This is a cross-sectional view of the connection between the high-voltage winding 130 and the locking device 100 in one embodiment of this application;

[0032] Figure 13 yes Figure 12 Enlarged view of section H in the middle;

[0033] Figure 14 This is a structural schematic diagram of the fixing block 200 at an angle in one embodiment of this application;

[0034] Figure 15 This is a structural schematic diagram of the fixing block 200 at another angle in one embodiment of this application;

[0035] Figure 16 This is a schematic diagram of the structure of the lower insert 300 in one embodiment of this application;

[0036] Figure 17 This is a schematic diagram of the structure of the upper insert 400 in one embodiment of this application. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0038] like Figures 1 to 3 As shown, the dry-type transformer 10 is a three-phase transformer, with phases A, B, and C, meaning it comprises three single-phase transformers. Depending on the structure of the core 110, the three single-phase transformers can be arranged in a linear or delta configuration, and the three transformers can be symmetrical. Furthermore, this dry-type transformer 10 can also be used as an isolation transformer, frequency converter, or test transformer, etc.

[0039] In one embodiment, three single-phase transformers are arranged in a linear structure. The dry-type transformer 10 includes a core 110, a low-voltage winding 120, and a high-voltage winding 130. The core 110 includes three columnar core bodies 111, an upper yoke 112 located at the upper end of the three columnar core bodies 111, and a lower yoke 113 located at the lower end of the three columnar core bodies 111. Three low-voltage windings 120 are provided, each sleeved around the outer periphery of the three columnar core bodies 111. Three high-voltage windings 130 are provided, each sleeved around the outer periphery of the three low-voltage windings 120. That is, the three columnar core bodies 111, the three low-voltage windings 120, and the three high-voltage windings 130 are sequentially sleeved from the inside out, thereby forming a three-phase dry-type transformer 10. Furthermore, the columnar core body 111, the low-voltage winding 120, and the high-voltage winding 130 of each phase are coaxially arranged, that is, their axial directions are in the same direction. The columnar iron core 111 is composed of multiple layers of silicon steel sheets, which are bound and fixed together with cable ties. The radial cross-section of the columnar iron core 111 is approximately elliptical, circular, or other shapes, as long as it can be accommodated in the hollow cavity of the low-voltage winding 120; no restrictions are imposed here. The upper yoke 112 and lower yoke 113 are also composed of multiple layers of silicon steel sheets, which fix the three columnar iron cores 111 together to form the iron core 110.

[0040] A core clamp 140 is provided on the outer side of the core 110 to hold the core 110. The core clamp 140 can be a channel steel component or a hollow tube component, and there is no limitation on it. There are four core clamps 140, two of which are symmetrically located on both sides of the upper end of the core 110; the other two are symmetrically located on both sides of the lower end of the core 110.

[0041] Combination Figure 2 and Figure 4 As shown, the low-voltage winding 120 includes a copper foil 121, a low-voltage insulation layer 122, and a support strip 123, with the copper foil 121 and the low-voltage insulation layer 122 alternately arranged. The copper foil 121 is formed by winding a whole sheet of copper foil paper, and the low-voltage insulation layer 122 is overlapped with the copper foil 121 and wound together, thus achieving the alternating arrangement of the copper foil 121 and the low-voltage insulation layer 122.

[0042] The low-voltage winding 120 is provided with at least one heat dissipation channel, which is located between adjacent copper foils 121 and low-voltage insulation layers 122, and a support bar 123 is located in the heat dissipation channel to support and isolate adjacent copper foils 121 and low-voltage insulation layers 122.

[0043] like Figures 5-9As shown, the high-voltage winding 130 includes a winding body 1310, a high-voltage coil 1320, and a high-voltage insulation layer 1330. The conductor is wound on the winding body 1310 to form the high-voltage coil 1320. The high-voltage coil 1320 includes several coil segments, which are spaced apart along the axial direction of the winding body 1310.

[0044] In one embodiment, see Figure 5 and Figure 6 The winding body 1310 adopts a fixed winding structure. Specifically, the winding body 1310 includes several winding plates 1313 and several auxiliary components 1311. The winding plates 1313 are arranged along the axial direction of the winding body 1310 and are evenly distributed along the circumference of the winding body 1310. The auxiliary components 1311 are annular and spaced apart along the axial direction of the winding body 1310. The auxiliary components 1311 are snap-fitted to the winding plates 1313. The winding plates 1313 are fixed comb plates, that is, several winding grooves 1314 are provided on the winding plates 1313 so that several comb teeth are formed on one side of the winding plates 1313 for winding wires. At least one section of coil is provided between two adjacent comb teeth on the winding plates 1313, so that each winding groove 1314 is wound with wires. The high-voltage coils 1320 are reasonably distributed and the sections of coil are spaced apart, resulting in balanced force and good mechanical strength. Compared to traditional structures, the winding body 1310 eliminates the rigid insulating liner, resulting in better heat conduction. It also eliminates the interface between the high-voltage insulation layer and the rigid insulating liner, thereby suppressing surface discharge of the rigid insulating liner and saving materials, thus reducing costs.

[0045] Furthermore, the winding plate 1313 without comb teeth has several support parts on the other side to abut against the winding fixture, so that the winding plate 1313 will not soften and deform due to high temperature under the high temperature of injection molding high voltage insulation layer 1330, which would cause the high voltage coil 1320 to lack support, effectively avoiding the high voltage coil 1320 from inward deformation and ensuring the quality of high voltage winding 130.

[0046] In another embodiment, see Figure 7 and Figure 8The winding body 1310 adopts a movable winding structure. The winding body 1310 includes several winding plates 1313, several winding elements 2314, and several auxiliary elements 1311. The structure of the auxiliary elements 1311 and their connection with the winding plates are as described previously and will not be repeated here. Several winding elements 2314 are provided on the winding plates 1313, movable along the winding plate 1313. A winding groove 1314 is formed between two adjacent winding elements 2314 on the winding plate 1313 for winding the conductor. The winding plate 1313 and the winding elements 2314, when engaged, form a comb-like structure. At least one section of coil is provided between two adjacent winding elements 2314 on the winding plate 1313, ensuring that each winding groove 1314 is wound with a conductor. High-voltage coils 1320 are rationally distributed, and each section of coil is spaced apart.

[0047] Specifically, a movable groove 2315 is provided at the bottom where the winding component 2314 connects to the winding plate 1313. The winding component 2314 and the winding plate 1313 are slidably connected through the movable groove 2315, allowing the winding component 2314 to move along the winding plate 1313. This facilitates flexible adjustment of the position of the winding component 2314 according to the shape and structure of the high-voltage coil 1320, broadening its applicability and further reducing costs. For example, the winding plate 1313 is an I-shaped strip, and the winding component 2314 is a rectangular plate. The movable groove 2315 of the winding component 2314 is correspondingly set as a T-shaped groove, meaning the winding plate 1313 passes through the movable groove 2315, allowing the winding component 2314 to move along the winding plate 1313.

[0048] The winding body 1310 is made of fiber-reinforced composite material, which has the characteristics of being lightweight and high-strength. This gives the winding body 1310 good mechanical strength, which can effectively support the winding of the conductor and is not easily damaged. It also avoids the conductor being scattered and displaced by the injection impact force generated when the high-temperature vulcanized silicone rubber is injected into the winding body 1310. In addition, the fiber-reinforced composite material has good heat resistance, which prevents the winding body 1310 from deforming due to excessive heat generated by the high-voltage coil 1320 during the operation of the dry-type transformer 10.

[0049] Combination Figure 5 , Figure 6 , Figure 9 and Figure 11As shown, a high-voltage coil 1320 is formed by circumferentially winding a conductor around the outer circumferential surface of the winding body 1310. Specifically, the conductor is wound from one end of the winding body 1310 to the other end, and wound from one end of the winding body 1310 to the other end of the winding body 1310 through the winding groove 1314 at the other end of the winding body 1310, so that the high-voltage coil 1320 is spaced apart along the axial direction of the winding body 1310. After the conductor is wound, two external terminals are formed at the beginning and end, namely the first external terminal D and the second external terminal X. The two external terminals are respectively connected to the output terminals 20. The output terminal 20 connected to the first external terminal D is used to connect a cable, and the output terminal 20 connected to the second external terminal X is used to connect other external terminals, such as for interconnection with other phase transformers in a three-phase transformer. The conductor has six taps leading out from the middle of the winding body 1310 along its axial direction. These taps are tap 2, tap 3, tap 4, tap 5, tap 6 and tap 7. The six taps form a tap switch. For ease of description, taps 2, 4 and 6 are defined as the first tap switch, and taps 3, 5 and 7 are defined as the second tap switch.

[0050] When the wire is wound, it is wound in a winding groove 1314 corresponding to all the winding plates 1313, so that each coil formed by the wire is perpendicular to the axis of the winding body 1310. The winding is convenient and the wire is neatly arranged. The winding plate 1313 is subjected to uniform force and has good mechanical strength.

[0051] Combination Figure 10 The diagram shows a partial cross-sectional view of the high-voltage winding 130, which is covered with a high-voltage insulation layer 1330, cut along its axial direction. The conductor is wound using the aforementioned winding method in a comb-shaped winding plate 1313 to form a disc-shaped high-voltage coil 1320. Along the axial direction of the high-voltage winding 130, the disc-shaped high-voltage coil 1320 and the comb teeth of the winding plate 1313 are spaced apart, that is, a disc coil is provided between two adjacent comb teeth. This coil structure has good mechanical strength and strong ability to withstand the electrostatic force generated by short-circuit current. Compared with layered coils, it has more discs and better heat dissipation.

[0052] Combination Figure 9 As shown, taps 6, 4, and 2 are arranged in sequence to form the first tap switch, and taps 3, 5, and 7 are arranged in sequence to form the second tap switch. The first tap switch and the second tap switch are arranged in parallel. The six taps form the tapping device of the high-voltage coil 1320, which is used to adjust the voltage of the dry-type transformer 10 according to different operating conditions.

[0053] The conductor is wound around the winding body 1310 to form a high-voltage coil 1320. The high-voltage coil 1320 is thus loop-shaped. The loop width of the high-voltage coil 1320 is defined as its width. Therefore, the width of the high-voltage coil 1320 is consistent across all its radial sections, ensuring overall force balance. However, considering practical operation, the widths of each coil across its radial section may not be exactly the same, as long as they are approximately identical.

[0054] In this embodiment, the tap changer includes six taps, so the dry-type transformer 10 has five adjustable voltage levels. In other embodiments, the tap changer may also include four taps, that is, the first tap changer and the second tap changer each include two taps, so the dry-type transformer has three adjustable voltage levels. As long as it meets the actual usage requirements of the dry-type transformer, it is acceptable and no limitation is imposed here.

[0055] Combination Figures 6 to 9 A high-voltage winding 130 is formed by wrapping a high-voltage coil 1320 and a winding body 1310 with a high-voltage insulation layer 1330. The high-voltage insulation layer 1330 is made of high-temperature vulcanized silicone rubber. First, the conductor is wound around the winding body 1310 to form the high-voltage coil 1320. The winding body 1310 and the high-voltage coil 1320 serve as a preform for the high-voltage winding. This preform is placed in an injection mold of an injection molding machine, and high-temperature vulcanized silicone rubber is injected into the outer periphery of the preform by adding molding material, i.e., silicone rubber raw material, to obtain the high-voltage winding 130. The use of high-temperature vulcanized silicone rubber in the high-voltage insulation layer 1330 improves the overall insulation and mechanical properties of the high-voltage winding 130.

[0056] After the high-voltage coil 1320 and the winding body 1310 are encapsulated by high-temperature vulcanized silicone rubber through vacuum injection, the high-temperature vulcanized silicone rubber fills the gap between the high-voltage coil 1320 and the winding body 1310 and wraps the two ends of the winding body 1310. The high-temperature vulcanized silicone rubber does not cover the inner wall of the winding body 1310, so that the high-voltage winding 130 is hollow in shape as a whole. It can be a hollow cylinder, a hollow elliptical cylinder, or other hollow cylindrical shapes.

[0057] Before the overall injection of high-temperature vulcanized silicone rubber, the high-voltage winding preform is fixed in the injection mold using the locking device 100, see [reference]. Figures 11 to 13The locking device 100 is used to fix the high-voltage winding preform in the injection mold by locking the output terminal 20, so as to inject and form a high-voltage insulation layer 1330 on the outer periphery of the high-voltage winding preform to obtain the high-voltage winding 130. The locking device 100 includes a fixing block 200, an upper insert 400 and a lower insert 300. The fixing block 200 is used to connect the output terminal 20 and cover the mounting surface 22 of the output terminal 20. The upper insert 400 and the lower insert 300 are mated and cover the outer periphery of the fixing block 200 for connecting the injection mold. The locking device 100 of this application can pre-lock the output terminal 20 through the separate fixing block 200, so that the high voltage winding preform connected to the fixing block 200 can be placed directly into the injection mold cavity at the molding station to start the molding process. The operation is simple, the production cycle is shortened, and the manufacturing cost is reduced. By covering the mounting surface 22 of the output terminal 20 with the fixing block 200, the injection molding material can be prevented from seeping into the interior of the output terminal 20 and causing it to fail. By cooperating with the lower insert 400 and the upper insert 300 to cover the entire fixing block 200, the possibility of the mounting surface 22 of the output terminal 20 being bumped or damaged by the injection mold can be effectively reduced, thereby ensuring product quality.

[0058] Combination Figure 14 and Figure 15 The fixing block 200 is made of copper material by machining. The fixing block 200 includes a connecting part 210 and a fixing part 220 connected together. The connecting part 210 is used to connect the outgoing terminal 20. Both the connecting part 210 and the fixing part 220 are cylindrical in shape. The diameter of the connecting part 210 is smaller than the diameter of the fixing part 220, so that a stepped surface 201 is formed between the fixing part 220 and the connecting part 210. The outgoing terminal 20 includes an inner connection (not shown in the figure) and an outer connection 21 connected together. The inner connection is used to connect the wires inside the high voltage winding 130, that is, the two external connections led out from the high voltage coil 1320. The outer connection 21 is used to connect the connector outside the high voltage winding 130. The end face of the outer connection 21 away from the inner connection is the mounting surface 22 of the outgoing terminal 20. The mounting surface 22 is flush with the outer peripheral surface of the subsequent high voltage insulation layer 1330, that is, the mounting surface 22 is exposed on the outer peripheral surface of the high voltage winding 130. The stepped surface 201 is used to cover the mounting surface 22. That is, after the fixing block 200 is connected to the outgoing terminal 20, the stepped surface 201 of the fixing block 200 is in close contact with the mounting surface 22 of the outgoing terminal 20.

[0059] The outer part 21 is cylindrical in shape. One end of the outer part 21 is provided with a connecting hole 23, which is a threaded hole. The connecting part 210 is installed in the connecting hole 23 of the outer part 21. The length of the connecting part 210 along the axial direction of the fixing block 200 is defined as the length of the connecting part 210, and the length of the connecting hole 23 along its axial direction is defined as the length of the connecting hole 23. In this embodiment, the length of the connecting part 210 is less than the length of the connecting hole 23, so that the connecting part 210 can be fully inserted into the connecting hole 23 of the outer part 21, and the stepped surface 201 can fit and cover the mounting surface 22. Thus, when the fixing block 200 is fixedly connected to the output terminal 20, the interior of the outer part 21 of the output terminal 20 is sealed, ensuring that the molding material cannot penetrate into the interior of the outer part 21 during the injection molding process of the high voltage insulation layer 1330, thereby improving the product qualification rate. Conversely, if the length of the connecting portion 210 is greater than the length of the connecting hole 23, after the connecting portion 210 extends into the connecting hole 23 and abuts against its bottom, a portion of the connecting portion 210 will still be outside the connecting hole 23 and unable to extend further. This results in a gap between the stepped surface 201 and the mounting surface 22, preventing them from fitting together. The molding material can easily seep into the threaded area inside the outer part 21 of the outgoing terminal 20 through this gap, causing it to fail to connect to the external connector of the high-voltage winding 130. Furthermore, the outer peripheral surface of the connecting portion 220 is provided with an external thread that matches and connects to the connecting hole 23 of the outer part 21, allowing the connecting portion 210 to be securely fastened to the outer part 21. The threaded connection is convenient to install and remove and has a reliable connection. In other embodiments, the length of the connecting portion can also be equal to the length of the connecting hole, as long as the connecting portion can fully extend into the outer part to completely close the mounting surface with the stepped surface; this is not a limitation.

[0060] The outer portion 21 is generally cylindrical. In this embodiment, the diameter of the fixing portion 220 is larger than the outer circumferential diameter of the outer portion 21, that is, the diameter of the stepped surface 201 is larger than the outer diameter of the mounting surface 22. This allows the stepped surface 201 to completely cover the entire mounting surface 22 of the lead terminal 20, effectively preventing collision damage to the lead terminal 20 when the injection mold closes, thus affecting product quality. In other embodiments, the diameter of the fixing portion can also be equal to the outer circumferential diameter of the outer portion, that is, the stepped surface can just cover the end face of the outer portion. As long as the stepped surface can cover the end face of the outer portion, it is not limited here.

[0061] Furthermore, since the fixing block 200 is manufactured using a turning process, when machining the external thread on the outer circumferential surface of the connecting part 220, due to the presence of the stepped surface 201, it is difficult to machine a regular external thread at the connection between the connecting part 210 and the fixing part 220. This results in the connecting part 210 not being able to be fully screwed into the connecting hole, and consequently, the stepped surface 201 not being able to tightly fit the mounting surface 22. Consequently, during injection, the molding material seeps into the inside of the outlet terminal 20, causing the outlet terminal 20 to fail. Therefore, an annular groove 211 is provided at the connection between the connecting part 210 and the fixing part 220. That is, the annular groove 211 is provided on the side of the connecting part 210 near the fixing part 220, and the outer diameter of the annular groove 211 is smaller than the outer diameter of the main body of the connecting part 210. When the fixing block 200 is connected to the output terminal 20, the main body of the connecting part 210 extends completely into the outer part 21 and is fastened to the outer part 21 by threads. The annular groove 211 on the connecting part 210 also extends completely into the outer part 21 but does not contact the outer part 21, so that the stepped surface 201 and the mounting surface 22 are tightly fitted. The presence of the annular groove 211 allows the connecting part 210 to extend completely into the outer part 21 without external threads at the connection between the connecting part 210 and the fixing part 220, thereby allowing the stepped surface 201 to tightly fit the mounting surface 22. This ensures that the molding material cannot penetrate into the interior of the output terminal 20 and cause it to fail, and also makes the fixing block 200 easy to process and manufacture.

[0062] In one embodiment, the end of the fixing part 220 away from the connecting part 210 is provided with a mounting groove 222 for locking the fixing block 220 onto the outgoing terminal 20 using a mechanical tool. In this embodiment, the mounting groove 222 is an internal hexagonal recess, and the mechanical tool can be a hexagonal wrench. The internal hexagonal recess and the hexagonal wrench can be used together to rotate the fixing block 200, so as to control the screwing in and out of the connecting part 210 in the connecting hole 23, thereby realizing the installation and disassembly of the fixing block 200 and the external part 21. In other embodiments, the mounting groove can also be a cross groove, a rectangular groove, etc., and the mechanical tool can be changed accordingly, as long as the installation and disassembly of the fixing block and the external part can be realized, and there is no limitation here.

[0063] In another embodiment, the end of the fixing part 220 away from the connecting part 210 is provided with at least one through hole 223 along the radial direction of the fixing block 200, for locking the fixing block 220 onto the outgoing terminal 20 by means of a mechanical tool. The through hole 223 penetrates the fixing block 200. A mechanical tool such as a rod (not shown in the figure) is inserted into the through hole 223, so that the rod partially or completely penetrates the fixing block 200, and the axial direction of the rod is perpendicular to the axial direction of the fixing block 200. The rod is pushed along the circumference of the fixing block 200, so that the rod rotates around the axial direction of the fixing block 200 and drives the fixing block 200 to rotate, so as to control the screwing in and screwing out of the connecting part 210 in the connecting hole 23, thereby realizing the installation and disassembly of the fixing block 200 and the external part 21. In this embodiment, two through holes 223 are provided, and the axial direction of the two through holes 223 is perpendicular to the same radial section of the fixing block 200. This makes it easier for the operator to select the appropriate through hole 223 to rotate the fixing block 200 according to the installation angle, making the installation more flexible and convenient. In other embodiments, the through holes can also be one, three or more, or the through holes may not penetrate the fixing block, as long as the installation and disassembly of the fixing block and the external part can be realized. No specific restrictions are imposed here.

[0064] In another embodiment, the end of the fixing part 220 away from the connecting part 210 is provided with both a mounting groove 222 and a through hole 223. The functions of both are as described above and will not be repeated. In this embodiment, one mounting groove 222 and two through holes 223 are provided. The mounting groove 222 is an internal hexagonal groove. The two through holes 223 are axially perpendicularly arranged on the same radial section of the fixing block 200, and the two through holes 223 partially penetrate the mounting groove 222, so that the bottom of the mounting groove 222 forms a cross-shaped groove. That is, the sidewall of the cross-shaped groove forms a transition support surface 224. When the rod passes through the through hole 223, the rod contacts the transition support surface 224 at the bottom of the mounting groove 222. This allows the load on the through hole 223 of the fixing part 220 to be evenly transmitted to other positions of the fixing part 220 through the transition support surface 224 when the rod rotates, thus avoiding stress concentration. This embodiment is provided with both mounting groove 222 and through hole 223, which not only reduces the difficulty of installing and disassembling the fixing block 200, but also reduces the weight of the fixing block 200, making operation more labor-saving.

[0065] An annular groove 221 is formed on the outer peripheral surface of the middle part of the fixing part 220. The cross-section of the annular groove 221 along the axial direction of the fixing part 220 is V-shaped. The annular groove 221 is used to cooperate with the insert to accurately position the fixing block 200 and the high-voltage winding preform connected to it in the injection mold cavity. The distance between the bottom of the annular groove 221 and the corresponding outer peripheral surface of the fixing part 220 along the radial direction of the fixing part 220 is defined as the groove depth of the annular groove 221. The groove depth of the annular groove 221 is approximately one-third of the diameter of the fixing part 220. The distance between the two side walls of the annular groove 221 along the axial direction of the fixing part 220 is defined as the groove width of the annular groove 221. The groove width at the top of the two side walls of the annular groove 221 is approximately one-third of the length of the fixing part 220. In this way, the annular groove 221 can be used to accurately position the fixing block 200 and the high-voltage winding preform connected to it in the injection mold cavity, while ensuring the structural strength of the fixing part 220.

[0066] Combination Figure 16 and Figure 17 The injection mold includes a horizontally arranged upper mold and a lower mold. The upper mold and the lower mold are joined together to form a cavity. The shape of the cavity matches the outer peripheral surface of the high-voltage winding 130. The high-voltage winding preform is horizontally installed in the cavity along its axial direction for injection. The locking device 100 includes two inserts, specifically an upper insert 400 and a lower insert 300. The upper insert 400 is fixedly connected to the bottom of the upper mold, and the lower insert 300 is fixedly connected to the top of the lower mold. The upper insert 400 and the lower insert 300 are joined together to form a cavity. The contour of the cavity matches the outer peripheral surface of the fixing part 220, so that after the upper insert 400 and the lower insert 300 are joined together, the fixing part 220 can be completely covered, further isolating the injection molding material and preventing the injection molding material from entering the insert and seeping into the inside of the output terminal 20, causing the output terminal 20 to fail. Among them, the mating surfaces of the upper mold and the lower mold, as well as the mating surfaces of the upper insert 400 and the lower insert 300, are all on the same horizontal plane, and these mating surfaces are uniformly defined as horizontal parting surfaces.

[0067] The lower insert 300 has a first groove 310, a first protrusion 320, and a second protrusion 330 on one side. The first groove 310 is a cylindrical groove with a radius matching that of the fixing part 220. The first groove 310 is used to accommodate part of the fixing block 200, specifically the part of the fixing part 220 located below the horizontal parting surface. The end face of the lower insert 300 near the outlet terminal 20 is defined as the first front end face 301. When the high-voltage winding preform is installed in the cavity of the injection mold, and the fixing block 200 is connected to the outlet terminal 20 and the lower insert 300 covers the fixing block 200, the first front end face 301 of the lower insert 300 is flush with the stepped surface 201 of the fixing block 200. That is, the first front end face 301 and the stepped surface 201 together cover part of the mounting surface 22 of the outlet terminal 20, further isolating the injection molding material from entering the interior of the outlet terminal 20, and further preventing the outlet terminal 20 from being damaged by impact when the injection mold is closed.

[0068] The first protrusion 320 is located in the axial middle of the first groove 310. The first protrusion 320 protrudes radially from the inner wall of the first groove 310, making the cross section of the first protrusion 320 radially of the first groove 310 semi-circular and the cross section of the first protrusion 320 axially of the first groove 310 in an inverted "V" shape. The two circumferential ends of the first protrusion 320 are flush with the horizontal parting surface of the lower insert 300. The first protrusion 320 corresponds to and matches the annular groove 221 of the fixing block 200. When the fixing block 200 and the lower insert 300 are installed together, the first protrusion 320 is correspondingly locked in the annular groove 221, which plays a role in positioning and support. It can also effectively prevent the fixing block 200 from sliding relative to the insert in its axial direction, ensuring the stability of the high voltage winding preform in the cavity, thereby ensuring the injection molding quality.

[0069] The second protrusion 330 is configured as two, and the two second protrusions 330 are respectively connected to the two circumferential ends of the first protrusion 320 and protrude from the horizontal parting surface of the lower insert 300. The second protrusion 330 includes a locking part 331 and a blocking part 332. The locking part 331 is connected to the circumferential end of the first protrusion 320 and is used to engage with the first protrusion 320 to engage the annular groove 221. The cross section of the locking part 331 along the radial direction of the first groove 310 is trapezoidal, and the opposite sides of the two locking parts 331 are approximately parallel, so that the cross section of the two locking parts 331 and the first protrusion 320 along the radial direction of the first groove 310 is approximately U-shaped, and the cross section of the locking part 331 along the axial direction of the first groove 310 is approximately "V"-shaped. The locking part 331 corresponds to and matches the annular groove 221 of the fixing block 200, so that when the fixing block 200 is installed with the lower insert 300, the locking part 331 is engaged in the annular groove 221, further positioning the fixing block 200 and preventing the fixing block 200 from sliding relative to the insert in its axial direction. The blocking part 332 is connected to the end face of the locking part 331 away from the first groove 310, and the tops of the two are flush. The blocking part 332 is a trapezoidal platform. The cross section of the blocking part 332 along the axial direction of the first groove 310 is trapezoidal, and the cross section along the radial direction of the first groove 310 is rectangular. The length of the blocking part 332 along the axial direction of the first groove 310 is greater than the length of the locking part 331 along the axial direction of the first groove 310. This can further form a stable and reliable positioning of the fixing block 200 and effectively prevent the fixing block 200 from sliding relative to the insert in its circumferential direction.

[0070] The upper insert 400 has a second groove 410, a third protrusion 420, and a groove 430 on one side. The second groove 410 has the same shape as the first groove 310, and will not be described in detail here. The second groove 410 is used to accommodate part of the fixing block 200, specifically for the part of the fixing part 220 located above the horizontal parting surface. The end face of the upper insert 400 near the outlet terminal 20 is defined as the second front face 401. When the high-voltage winding preform is installed in the cavity of the injection mold, the fixing block 200 is connected to the outlet terminal 20 and the upper insert 400 covers the fixing block 200. The second front face 401 of the upper insert 400 is flush with the stepped surface 201 of the fixing block 200. That is, the second front face 401 and the stepped surface 201 together cover the remaining part of the mounting surface 22 of the outlet terminal 20. Thus, the first front face 301, the second front face 401, and the stepped surface 201 cooperate to cover the entire mounting surface 22 of the outlet terminal 20, further isolating the injection molding material from entering the interior of the outlet terminal 20, and further preventing the outlet terminal 20 from being damaged by impact when the injection mold is closed. At the same time, the upper insert 400 and the lower insert 300 can completely cover the fixing block 200, effectively reducing the possibility of the fixing block 200 being bumped or damaged by the injection mold.

[0071] The third protrusion 420 is similar in shape and function to the first protrusion 320. The difference is that the two ends of the third protrusion 420 are lower than the horizontal parting surface of the upper insert 400 to make room for the groove 430. There are two grooves 430, which are located on the axial sides of the second groove 410, and are recessed inward from the horizontal parting surface of the upper insert 400. The bottoms of the two grooves 430 are connected to the two ends of the third protrusion 420, respectively. The groove 430 is a trapezoidal groove, that is, the cross section of the groove 430 along the radial direction of the first groove 310 is trapezoidal, and the bottom of the groove 430 is a horizontal surface. The shape of the groove 430 corresponds to and matches the shape of the blocking part 332 of the second protrusion 330. When the upper insert 400 and the lower insert 300 are installed together, the second protrusion 330 is partially locked in the groove 430, which plays a role in limiting the fit and preventing relative sliding between the upper insert 400 and the lower insert 300, thereby achieving precise assembly and improving the processing accuracy of the product.

[0072] Both the upper insert 400 and the lower insert 300 have a fourth protrusion 340 and a countersunk hole 350 on the side away from the fixing block 200 for matching and connecting with the injection mold. Specifically, the lower insert 300 has a fourth protrusion 340 on the side away from the first groove 310. The fourth protrusion 340 protrudes from the back side of the lower insert 300 away from the upper insert 400 along a direction perpendicular to the horizontal parting surface of the lower insert 300. The lower mold has a corresponding positioning groove. The shape of the fourth protrusion 340 matches the positioning groove. The two are connected to form a plug-in guide structure, which allows the lower insert 300 to be quickly and accurately installed on the lower mold. The countersunk hole 350 penetrates the lower insert 300 along a direction perpendicular to the horizontal parting surface of the lower insert 300, and the penetration position of the countersunk hole 350 corresponds to the fourth protrusion 340, that is, the countersunk hole 350 penetrates the fourth protrusion 340. The positioning groove of the lower mold is provided with a threaded hole corresponding to the countersunk hole 350. By inserting screws or other fasteners into the countersunk hole 350 and the corresponding threaded hole, the lower insert 300 can be fixedly connected to the lower mold. Among them, the fasteners are completely embedded in the countersunk hole 350 during installation, that is, the fasteners will not protrude from the horizontal parting surface of the lower insert 300, affecting the flatness and avoiding interference with mold closing. On the other side of the upper insert 400 where the second groove 410 is not provided, there is a fourth protrusion 340. The fourth protrusion 340 protrudes from the back side of the upper insert 400 away from the lower insert 300 along a direction perpendicular to the horizontal parting surface of the upper insert 400. A corresponding positioning groove is provided on the upper mold. The countersunk hole 350 penetrates the upper insert 400 along a direction perpendicular to the horizontal parting surface of the upper insert 400, and the countersunk hole 350 penetrates the fourth protrusion 340. The connection method between the upper insert 400 and the upper mold is the same as the connection method between the lower insert 300 and the lower mold, and will not be described again here.

[0073] During assembly, firstly, the fixing block 200 is installed onto the output terminal 20 of the high-voltage winding preform. Specifically, the connecting part 210 of the fixing block 200 is installed into the connecting hole 23 of the output terminal 20, and the stepped surface 201 of the fixing block 200 is tightly fitted to and covers the mounting surface 22 of the output terminal 20. Then, the insert is connected to the injection mold. Specifically, the lower insert 300 is placed in the positioning groove of the lower mold, and the screw is inserted from the horizontal parting surface of the lower insert 300 into the countersunk hole 350 and screwed into the corresponding threaded hole on the lower mold until the screw is tightened and fully embedded in the countersunk hole 350. At this time, the lower insert 300 and the lower mold are fixedly connected, and the upper insert 400 and the upper mold are also fastened in the same manner. Finally, the high-voltage winding preform connected to the fixing block 200 is installed onto the injection mold. Specifically, the high-voltage winding preform is first installed into the lower mold, so that the fixing block 200 is installed in the lower insert 300. At this time, the lower part of the fixing part 220 is accommodated in the first groove 310, and the lower part of the annular groove 221 is matched and connected with the locking part 331 of the first protrusion 320 and the second protrusion 330, so that the first front end face 301 of the lower insert 300 is flush with the stepped surface 201 of the fixing block 200. Then, the upper mold and the lower mold are aligned vertically. The upper insert 400 and lower insert 300 are aligned vertically and installed. At this point, the upper part of the fixing part 220 is accommodated within the second groove 410, the upper part of the annular groove 221 matches and connects with the third protrusion 420, and the blocking part 332 of the second protrusion 330 is engaged within the groove 430. This makes the second front end face 401 of the upper insert 400 flush with the stepped surface 201 of the fixing block 200, thus completely covering the fixing block 200 with the lower insert 300 and the upper insert 400. The lower mold and the upper mold also completely cover the high-voltage winding preform. In this way, the high-voltage winding preform is securely installed in the injection mold and can be directly injection molded.

[0074] The beneficial effects of this application are as follows: The locking device of this application can pre-lock the output terminal through the separate fixing block, so that the high voltage winding preform connected to the fixing block can be placed directly into the injection mold cavity at the molding station to start the molding process. The operation is simple, the production cycle is shortened, and the manufacturing cost is reduced. By covering the mounting surface of the output terminal with the fixing block, the injection molding material can be prevented from seeping into the interior of the output terminal and causing it to fail. By using the lower insert and the upper insert to cover the entire fixing block, the possibility of the mounting surface of the output terminal being bumped or damaged by the injection mold can be effectively reduced, thereby ensuring product quality.

[0075] Meanwhile, this application uses the cooperation of the lower insert and the upper insert to precisely position the fixing block and the high voltage winding preform connected thereto in the injection mold cavity, ensuring the accuracy and stability of the position of the high voltage winding preform during the high voltage winding molding process, thereby guaranteeing the quality of the product.

[0076] Furthermore, both the lower and upper inserts in this application are detachable structures. When an insert is damaged, production can continue simply by replacing the insert, thereby improving production efficiency and avoiding cost waste caused by equipment downtime.

[0077] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A locking device for fixing a high-voltage winding preform in an injection mold by locking the lead-out terminals, so as to inject and form a high-voltage insulation layer on the outer periphery of the high-voltage winding preform to obtain a high-voltage winding, characterized in that, The locking device includes a fixing block, an upper insert, and a lower insert. The fixing block is used to connect the output terminal and cover the mounting surface of the output terminal. The upper insert and the lower insert are mated together and cover the outer peripheral surface of the fixing block for connecting the injection mold.

2. The locking device as described in claim 1, characterized in that, The fixing block includes a connecting part and a fixing part connected together. The connecting part is used to connect the outgoing terminal. Both the connecting part and the fixing part are cylindrical in shape, and the diameter of the connecting part is smaller than the diameter of the fixing part, so that a stepped surface is formed between the fixing part and the connecting part. The stepped surface is used to cover the mounting surface.

3. The locking device as described in claim 2, characterized in that, One end of the outgoing terminal is provided with a connection hole, which is a threaded hole, and the outer peripheral surface of the connecting part is provided with an external thread that matches and connects with the connection hole.

4. The locking device as described in claim 3, characterized in that, The length of the connecting part is less than or equal to the length of the threaded hole.

5. The locking device as described in claim 2, characterized in that, An annular groove is provided on the outer periphery of the middle part of the fixing part, and the cross section of the annular groove along the axial direction of the fixing part is V-shaped.

6. The locking device as described in claim 2, characterized in that, The end of the fixing part away from the connecting part is provided with a mounting groove for locking the fixing block onto the outgoing terminal by means of a mechanical tool. The mounting groove is an internal hexagonal groove.

7. The locking device as described in claim 2, characterized in that, The fixing part is provided with at least one through hole on the outer periphery of the end away from the connecting part, for locking the fixing block on the outgoing terminal by mechanical tools, and the through hole is arranged radially along the fixing part.

8. The locking device as described in claim 5, characterized in that, The lower insert is provided with a first groove, a first protrusion and a second protrusion. The first groove is used to accommodate part of the fixing block, and the first protrusion and the second protrusion are used to match and connect with the annular groove.

9. The locking device as described in claim 8, characterized in that, The upper insert is provided with a second groove, a third protrusion, and a groove. The second groove is used to accommodate part of the fixing block, the third protrusion is used to match and connect with the annular groove, and the groove is used to match and connect with the second protrusion.

10. The locking device as claimed in claim 9, characterized in that, The second front end face of the upper insert and the first front end face of the lower insert are both flush with the stepped surface of the fixing block.

11. The locking device as claimed in claim 9, characterized in that, Both the upper insert and the lower insert have a fourth protrusion on the side away from the fixing block, for matching and connecting with the injection mold.

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