Oil-immersed three-dimensional roll iron core transformer

Abstract

The invention relates to the technical field of transformers, in particular to an oil-immersed type three-dimensional roll iron core transformer which comprises a transformer outer box formed by covering a cover plate on the top of a shell, an inner core body with a coil winding arranged on a roll iron core and a tensioning mechanism used for positioning and fixing the inner core body, and the tensioning mechanism comprises an upper clamping plate, a lower clamping seat and a fastening set. The upper clamping plate and the lower clamping seat are respectively arranged above and below the inside of the transformer outer box; and the three inner core bodies are positioned between the upper clamping plate and the lower clamping seat and are arranged in a triangular shape. By arranging the screwing and fastening mechanism, synchronous locking of the tensioning rods can be achieved, fastening of multiple sets of tensioning rods can be completed only through one-time operation, the assembling efficiency is improved, meanwhile, the locking amount is consistent when all point positions are synchronously locked, it is ensured that the upper clamping plate and the lower clamping base are evenly stressed, local stress concentration caused by fastening force difference is avoided, and the assembling efficiency is improved. And the problem of structural stability caused by uneven stress during traditional multi-bolt fastening is avoided, and the reliability of equipment operation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, in particular to an oil-immersed three-dimensional wound iron core transformer. Background Art

[0002] The oil-immersed three-dimensional wound core transformer is a power transformer that uses insulating oil as a cooling medium and adopts a three-phase three-dimensional wound core structure. Its core is formed by continuous winding and has a symmetrical magnetic circuit. It has the characteristics of low no-load loss, low operating noise, and high energy efficiency. It is mainly used to achieve voltage conversion and power transmission in power transmission and distribution systems, and is widely used in medium and large capacity scenarios.

[0003] The upper and lower clamping plates of an oil-immersed three-dimensional wound core transformer are usually fastened through a through-connection with insulating bolts. Insulating spacers and other components are used to adjust the spacing and ensure insulation performance, thereby forming a stable clamping structure to ensure that the core and winding are evenly and firmly stressed during operation, while meeting the electrical insulation requirements of the equipment.

[0004] Usually, there are multiple bolt fastenings. During assembly, multiple screws need to be tightened, which results in cumbersome operation and low assembly efficiency. In addition, manual tightening at multiple locations results in inconsistent tightening force of each bolt, causing uneven force on the upper and lower clamping plates, which can easily cause local deformation of the core or winding, affecting structural stability and equipment operating performance, and increasing the risk of insulation failure or increased operating noise due to tightening deviation. Summary of the Invention

[0005] The object of the present invention is to provide an oil-immersed three-dimensional wound core transformer to solve the technical problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions.

[0007] An oil-immersed three-dimensional wound iron core transformer comprises an outer transformer box formed by a cover plate arranged on the top of a shell, an inner core body with a coil winding arranged on the wound iron core, and a tensioning mechanism for positioning and fixing the inner core body, the tensioning mechanism comprising an upper clamping plate, a lower clamping seat and a tightening group, the upper clamping plate and the lower clamping seat being respectively arranged at the upper and lower parts of the outer transformer box; three inner core bodies are positioned between the upper clamping plate and the lower clamping seat, and are arranged in a triangular shape, three tightening groups are provided on the upper clamping plate and the lower clamping seat, and correspond one to one to the positions of the inner core bodies; the tightening group comprises a plurality of internal threaded barrels arranged at intervals around the corresponding inner core bodies, and each internal threaded barrel is rotatably mounted on the lower clamping seat; a screwing tightening mechanism is provided in the lower clamping seat, and the screwing tightening mechanism is used to adjust the synchronous rotation of each internal threaded barrel to realize the synchronous locking operation of each tightening group.

[0008] Preferably, insulating pads are fixed on the lower surface of the upper clamp and the upper surface of the lower clamp seat at positions corresponding to the positions of each inner core body; each insulating pad is provided with a positioning groove, which is V-shaped; the two sides of the top of the wound iron core are correspondingly mounted in the two positioning grooves above, and the two sides of the bottom are correspondingly mounted in the two positioning grooves below to achieve positioning.

[0009] Preferably, the tightening group also includes several tightening rods; through holes are provided on the upper clamping plate corresponding to the positions of each internal threaded tube; the bottom end of each tightening rod has a threaded portion adapted to the internal threaded tube; the tightening rod passes through the corresponding internal threaded tube and then is screwed into the through hole to achieve tightening.

[0010] Preferably, the screwing and tightening mechanism includes a toothed disc, a driven gear, a driving gear and an adjusting device; a cavity is provided in the lower clamp seat, and toothed discs are installed on the top wall of the cavity at positions corresponding to the positions of each inner core body through a shaft; each internal threaded tube extends into the cavity, and the bottom end is sealed; a driven gear is fixed on the end of each internal threaded tube located in the cavity; the toothed disc and the three driven gears corresponding thereto are all meshed; a driving gear is installed on the top wall of the cavity between the three toothed discs through a rotating shaft, and the driving gear is meshed with the three toothed discs; the adjusting device is arranged in the cavity, and one end extends through the cavity to the outside of the lower clamp seat, and is used to drive the rotating shaft for rotation adjustment.

[0011] Preferably, the adjusting device includes a worm, a worm wheel and a screwing portion; the worm wheel is fixed on the rotating shaft, the worm is horizontally installed in the cavity and engages with the worm wheel; one end of the worm extends through the outside of the lower clamping seat and is installed with a screwing portion.

[0012] Preferably, an internal support mechanism is provided on the lower clamping seat between the three inner core bodies, which is used to provide support to the three inner core bodies from the inside; the internal support mechanism includes a mounting platform, a linkage adjustment mechanism and an arc-shaped support plate; the mounting platform is fixed on the lower clamping seat and is located between the three inner core bodies; the linkage adjustment mechanism is vertically arranged on the top of the mounting platform; three arc-shaped support plates are arranged on the periphery of the mounting platform, and the arc-shaped support plates correspond to the positions of the coil windings one by one; the linkage adjustment mechanism is linked to the rotating shaft, and is used for when the tightening mechanism drives the internal threaded cylinder to tighten the tightening rod, the linkage arc-shaped support plate moves radially until it contacts the outer wall of the coil winding.

[0013] Preferably, the linkage adjustment mechanism includes a bidirectional threaded rod, a mounting plate, a nut seat and a traction arm; three radially extending slide grooves are provided on the mounting platform, and the mounting plates are slidingly installed in the three slide grooves; the three arc-shaped abutment plates are respectively fixed on the corresponding mounting plates; the bidirectional threaded rod is rotatably installed on the mounting platform, and the two threaded parts on the bidirectional threaded rod are respectively threadedly matched with nut seats; three nut seats are correspondingly hingedly installed on the two nut seats; the other ends of the two corresponding nut seats in the upper and lower parts are hinged to the corresponding mounting plates; the bottom end of the bidirectional threaded rod extends through the cavity of the lower clamp seat and is coaxially fixed with the rotating shaft.

[0014] Preferably, a wedge-shaped abutment block for abutting and cooperating with two adjacent coils of iron cores is fixed on the top and bottom ends of each arc-shaped abutment plate.

[0015] Preferably, an insulating tube is sleeved on the outside of each tensioning rod, and a protective plate is clamped and installed between the insulating tubes on two adjacent tensioning rods in the same fastening group, forming an outer protective structure at the periphery between the upper clamping plate and the lower clamping seat to provide protection for the three inner cores from the outside.

[0016] Preferably, the insulating tube is a hollow body and is movably mounted on the tensioning rod; a number of slots that pass through the interior of the insulating tube are distributed on the outer wall of the insulating tube; the protective plate is composed of an arc-shaped elastic part and a card-insertion part respectively fixed at both ends of the arc-shaped elastic part; the card-insertion part is inserted into the corresponding slot on the insulating tube; the curvature of the arc-shaped elastic part is adapted to the outer periphery of the coil winding.

[0017] Compared with the prior art, the present invention has the following beneficial effects.

[0018] By setting up a screwing tightening mechanism, the synchronous locking of the tensioning rods can be achieved, and the tightening of multiple groups of tensioning rods can be completed with only a single operation, thereby improving assembly efficiency. At the same time, the locking amount of each point during synchronous locking is consistent, ensuring that the upper clamping plate and the lower clamping seat are evenly stressed, avoiding local stress concentration caused by differences in tightening force, and avoiding structural stability problems caused by uneven force during traditional multi-bolt tightening, thereby improving the reliability of equipment operation.

[0019] The inner support mechanism cooperates with the rotating shaft. When the tightening mechanism drives the internal threaded barrel to lock the tightening rod, the linkage adjustment mechanism drives the arc-shaped support plate to move radially and resist the coil winding, forming an inner support system. It constitutes a three-dimensional constraint with the longitudinal tensioning force of the upper clamping plate and the lower clamping seat, effectively suppressing the lateral deformation of the wound iron core and coil winding, greatly improving the structural rigidity of the inner core and extending its fatigue life.

[0020] The outer protective structure composed of an insulating tube and a protective plate forms a protective barrier on the periphery. The hollow structure of the insulating tube and the evenly distributed design of the slots, combined with the arc-shaped adaptability of the arc-shaped elastic part, can disperse the external impact force to multiple tension rods and the upper clamping plate and lower clamping seat. Through multi-stage buffering, energy is absorbed, reducing insulation damage or winding deformation caused by external forces directly acting on the wound iron core and coil winding, thereby enhancing the equipment's impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0022] Figure 2 Schematic diagram of the internal structure of the housing in the present invention;

[0023] Figure 3 It is a schematic diagram of the local structure between the upper clamping plate and the lower clamping seat in the present invention;

[0024] Figure 4 for Figure 3 The structure shown omits the schematic diagram of the tension rod;

[0025] Figure 5 This is a schematic diagram of the positioning and installation of the wound core and coil winding in the present invention;

[0026] Figure 6 This is a structural schematic diagram of the wound core in the present invention being positioned in the positioning groove;

[0027] Figure 7 Detailed structural diagram of the screwing and fastening mechanism in the present invention;

[0028] Figure 8 Schematic diagram of the internal support mechanism structure of the present invention;

[0029] Figure 9 Schematic diagram of the linkage adjustment mechanism structure of the present invention;

[0030] Figure 10 Schematic diagram of the structure distribution of the arc-shaped abutment plate and the wedge-shaped abutment block in the present invention;

[0031] Figure 11 Schematic diagram of the structural distribution of the insulating tube and the protective plate in the present invention;

[0032] Figure 12 A schematic diagram of the structure of the peripheral protection structure in the present invention;

[0033] Figure 13 This is a schematic diagram of the clamping connection between the protective plate and the insulating cylinder in the present invention.

[0034] In the figure: 01, shell; 02, cover plate; 03, insulating spacer; 031, positioning groove; 04, wound iron core; 05, coil winding; 06, peripheral protection structure; 1, upper clamping plate; 2, lower clamping seat; 3, tensioning rod; 31, internal threaded cylinder; 32, through-hole; 4, screwing and fastening mechanism; 41, gear plate; 42, driven gear; 43, rotating shaft; 44, driving gear; 45, worm; 46, worm wheel; 47, screwing part; 5, internal support mechanism; 51, mounting platform; 511, slide groove; 52, linkage adjustment mechanism; 521, two-way threaded rod; 522, mounting plate; 523, nut seat; 524, traction arm; 53, arc-shaped abutment plate; 54, wedge-shaped abutment block; 6, insulating cylinder; 61, notch; 7, protective plate; 71, arc-shaped elastic part; 72, plug-in part. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0036] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection", and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct connection or an indirect connection through an intermediate medium. Here, "fixed" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0037] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0038] In the embodiments of the present invention, "and / or" is simply a description of the association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0039] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present invention. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in yet other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0040] Example 1

[0041] See also Figures 1-13 The present invention provides an oil-immersed three-dimensional wound core transformer, which includes a transformer outer box formed by a cover plate 02 covering the top of a shell 01, an inner core body with a coil winding 05 arranged on the wound core 04, and a tensioning mechanism for positioning and fixing the inner core body. Specifically, the cover plate 02 is used to seal the top opening of the shell 01. The wound core 04 is a frame-shaped three-dimensional winding structure. Three wound cores 04 are arranged in an equilateral triangle between an upper clamping plate 1 and a lower clamping seat 2. The coil winding 05 is arranged at the connection between every two wound cores 04, and the coil winding 05 covers the connection between the two wound cores 04, thereby fixing the wound cores 04 in pairs.

[0042] In addition, the cover plate 02 also has a wiring structure. The inner core and the wiring structure adopt existing technology, and the specific structure and working principle will not be described in detail.

[0043] like Figure 5 and Figure 6 As shown, insulating pads 03 are fixed on the lower surface of the upper splint 1 and the upper surface of the lower clamp seat 2 at positions corresponding to the positions of each inner core, that is, three insulating pads 03 are fixed on the lower surface of the upper splint 1 and the upper surface of the lower clamp seat 2 respectively. The insulating pads 03 can be circular or polygonal. The insulating pads 03 in this application are preferably circular.

[0044] The position of the insulating spacer 03 corresponds one-to-one to the position of each inner core body, wherein each insulating spacer 03 is provided with a positioning groove 031, and the positioning groove 031 is V-shaped to accommodate two wound cores 04 at the same time. During the specific installation, the two sides of the top of the wound core 04 are correspondingly mounted in the two corresponding positioning grooves 031 above, and the two sides of the bottom of the wound core 04 are correspondingly mounted in the two corresponding positioning grooves 031 below to achieve positioning. The wound core 04 is positioned in the positioning groove 031 to achieve positioning, and the coil winding 05 is arranged on the wound core 04. In this way, the wound core 04 and the coil winding 05 can be positioned and placed between the upper clamping plate 1 and the lower clamping seat 2. At the same time, the insulating spacer 03 also provides insulation protection and buffering effect.

[0045] Among them, the tightening mechanism includes an upper clamping plate 1, a lower clamping seat 2 and a fastening group. The upper clamping plate 1 and the lower clamping seat 2 are respectively arranged at the upper and lower parts of the transformer outer box, and both are hexagonal structures. There are three fastening groups on the upper clamping plate 1 and the lower clamping seat 2, and the three fastening groups correspond to the positions of the inner core one by one.

[0046] like Figure 2-Figure 4 The fastening group includes several tensioning rods 3 and several internally threaded tubes 31 arranged at intervals around the corresponding inner core body, and each internally threaded tube 31 is rotatably mounted on the lower clamping seat 2, and the bottom end of each tensioning rod 3 has a threaded portion adapted to the internally threaded tube 31. In addition, the upper clamping plate 1 is provided with through holes 32 corresponding to the positions of each internally threaded tube 31 for the tensioning rod 3 to be inserted.

[0047] In addition, a screwing and fastening mechanism 4 is provided in the lower clamping seat 2 , and the screwing and fastening mechanism 4 is used to adjust the synchronous rotation of each internal threaded cylinder 31 to achieve a synchronous locking operation of each fastening group.

[0048] After positioning each inner core in the corresponding area between the upper clamping plate 1 and the lower clamping seat 2, when tightening, first pass the tensioning rods 3 through the corresponding through-holes 32, and ensure that the bottom ends of the tensioning rods 3 are aligned one by one and inserted into the internal threaded cylinders 31;

[0049] Then, by operating the screwing and tightening mechanism 4, each internal threaded tube 31 can be driven to rotate synchronously to realize the synchronous screwing of the internal threaded tube 31. By utilizing the thread cooperation between the internal threaded tube 31 and the bottom end of the tightening rod 3, when each internal threaded tube 31 rotates synchronously, each tightening rod 3 can be locked synchronously to realize the tightening of the upper clamping plate 1 and the lower clamping seat 2, and finally realize the fixation of each inner core.

[0050] Example 2

[0051] See also Figure 7 This embodiment is used to further illustrate the screwing and fastening mechanism 4 of Example 1, as follows:

[0052] The screwing and tightening mechanism 4 includes a toothed disc 41, a driven gear 42, a driving gear 44 and an adjusting device. There is a cavity in the lower clamping seat 2. The toothed disc 41 is rotatably installed on the top wall of the cavity at the position corresponding to each inner core body through a shaft. Each internal threaded barrel 31 extends into the cavity and is sealed at the bottom end. A driven gear 42 is fixed on the end of the internal threaded barrel 31 located in the cavity. The sealing of the bottom end of the internal threaded barrel 31 ensures a stable connection between the internal threaded barrel 31 and the driven gear 42, and avoids communication between the inside and outside of the cavity. The toothed disc 41 and the three corresponding driven gears 42 are all meshed. A rotating shaft 43 is rotatably installed between the three toothed discs 41 on the top wall of the cavity. The driving gear 44 is fixed on the rotating shaft 43 and meshes with the three toothed discs 41.

[0053] The adjusting device is arranged in the cavity, and one end extends through to the outside of the lower clamping seat 2, and is used to drive the rotating shaft 43 for rotation adjustment, wherein the adjusting device specifically includes a worm 45, a worm wheel 46 and a screwing portion 47. The worm wheel 46 is fixed on the rotating shaft 43, and the worm 45 is horizontally installed in the cavity and engages with the worm wheel 46. One end of the worm 45 extends through to the outside of the lower clamping seat 2 and is installed with a screwing portion 47. The screwing portion 47 in this application is preferably a hexagonal end that can be matched with a hexagonal wrench.

[0054] When a hexagonal wrench is used to apply an operating force to the screwing portion 47, the worm 45 connected to the screwing portion 47 rotates in the cavity. Since the worm 45 is in meshing with the worm wheel 46, the rotating worm 45 can mesh with the worm wheel 46 to drive the rotation, thereby driving the rotating shaft 43 and the driving gear 44 to rotate synchronously.

[0055] The driving gear 44 is in meshing state with the three toothed discs 41, and the three toothed discs 41 are respectively mounted on the top wall of the cavity through the rotation of the shaft, and their positions correspond one to one with the three inner cores. Therefore, when the driving gear 44 rotates, it meshes and drives the three toothed discs 41 to rotate synchronously, ensuring the consistency of the movement of the three toothed discs 41.

[0056] When the toothed disc 41 rotates, it will drive the corresponding three driven gears 42 to rotate synchronously through the meshing relationship, and then drive the internal threaded tube 31 fixed to the driven gear 42 to rotate synchronously on the lower clamping seat 2. At this time, since the internal threaded tube 31 is adapted to the threaded portion at the bottom end of the tensioning rod 3, the synchronous rotation of the internal threaded tube 31 will drive each tensioning rod 3 to move upward or downward synchronously through the threaded cooperation. When the internal threaded tube 31 rotates in the locking direction, the tensioning rod 3 will be gradually screwed into the through hole 32, thereby realizing the tensioning between the upper clamping plate 1 and the lower clamping seat 2.

[0057] Through the above series of linkages, it finally acts on the tensioning rod 3, realizing the synchronous rotation of all the internal threaded tubes 31, ensuring the synchronous locking of each tensioning rod 3, so that the upper clamping plate 1 and the lower clamping seat 2 are evenly stressed, thereby stably fixing the inner core located between the two, and effectively solving the problems of cumbersome operation and inconsistent tightening force in traditional multi-bolt tightening.

[0058] Example 3

[0059] See also Figure 4 、 Figure 5 、 Figure 8 and Figure 9 Based on Example 2, this embodiment provides an oil-immersed three-dimensional wound core transformer with an internal support mechanism 5, specifically as follows:

[0060] The inner supporting mechanism 5 is provided on the lower clamping seat 2 between the three inner core bodies, which is used to provide support for the three inner core bodies from the inside. The inner supporting mechanism 5 includes a mounting platform 51, a linkage adjustment mechanism 52 and an arc-shaped abutment plate 53. The mounting platform 51 is fixed on the lower clamping seat 2 and is located between the three inner core bodies. The linkage adjustment mechanism 52 is vertically arranged on the top of the mounting platform 51. Three arc-shaped abutment plates 53 are arranged on the periphery of the mounting platform 51, and the arc-shaped abutment plates 53 correspond to the positions of the coil windings 05 one by one. The linkage adjustment mechanism 52 is linked with the rotating shaft 43 to cooperate with the rotating shaft 43 for driving the internal threaded cylinder 31 to tighten the tensioning rod 3 when the tightening mechanism 4 drives the internal threaded cylinder 31 to tighten the tensioning rod 3. In addition, a wedge-shaped abutment block 54 is fixed on the top and bottom ends of each arc-shaped abutment plate 53. When the arc-shaped abutment plate 53 abuts against the outer wall of the corresponding coil winding 05, the wedge-shaped abutment block 54 simultaneously abuts against the two adjacent iron cores 04.

[0061] Specifically, the linkage adjustment mechanism 52 includes a bidirectional threaded rod 521, a mounting plate 522, a nut seat 523 and a traction arm 524. Three radially extending slide grooves 511 are provided on the mounting platform 51. The mounting plates 522 are slidingly installed in the three slide grooves 511. This limiting structure ensures that the mounting plate 522 can only move radially along the mounting platform 51 and cannot be offset in other directions.

[0062] The three arc-shaped abutment plates 53 are respectively fixed on the corresponding mounting plates 522, and the bidirectional threaded rod 521 is rotatably mounted on the mounting platform 51. The two threaded parts on the bidirectional threaded rod 521 are respectively threadedly matched with nut seats 523, and three nut seats 523 are correspondingly hingedly installed on the two nut seats 523. The other ends of the two corresponding nut seats 523 in the upper and lower parts are hinged to the corresponding mounting plates 522. The bottom end of the bidirectional threaded rod 521 extends through the cavity of the lower clamping seat 2 and is coaxially fixed with the rotating shaft 43.

[0063] In this embodiment, the specific working principle of the inner support mechanism 5 is based on the linkage with the screw tightening mechanism 4. While achieving synchronous locking of the tensioning rod 3, it also provides stable support for the three inner cores from the inside. The detailed process is as follows:

[0064] First, when the screwing portion 47 is operated to drive the worm 45 to rotate, the worm 45 engages with the worm wheel 46 to drive the rotating shaft 43 to rotate, and then synchronously drives the bidirectional threaded rod 521 to rotate. The rotating bidirectional threaded rod 521 can threadably drive the two nut seats 523 to move axially, specifically to move away from or towards each other; when the tightening mechanism 4 is operated to tighten the tensioning rod 3, the bidirectional threaded rod 521 threadably drives the two nut seats 523 to move axially towards each other, and the traction arm 524 is driven by the nut seat 52 3 moves and deflects at an angle, and its thrust is transmitted to the mounting plate 522 along the extension direction of the slide groove 511, so as to push the mounting plate 522 to slide along the slide groove 511 toward the inner core body; the arc-shaped abutment plate 53 is fixed on the corresponding mounting plate 522, so the radial movement of the mounting plate 522 will synchronously drive the arc-shaped abutment plate 53 to move toward the inner core body, and finally the arc-shaped abutment plate 53 will gradually approach and abut against the outer wall of the coil winding 05, thereby supporting the coil winding 05 from the inside.

[0065] In addition, when the arc-shaped support plate 53 contacts the coil winding 05, the wedge-shaped support block 54 contacts the two adjacent winding cores 04 synchronously. On the one hand, the support stability of the coil winding 05 is further enhanced through the connection relationship between the winding core 04 and the coil winding 05. On the other hand, the resistance effect of the wedge-shaped support block 54 is used to limit the shaking of the winding core 04, and cooperates with the positioning effect of the positioning groove 031 on the insulating pad 03 on the winding core 04, so that the inner core body is more firmly positioned between the upper clamping plate 1 and the lower clamping seat 2.

[0066] It is worth noting that the action of the inner support mechanism 5 is completely synchronized with the locking action of the tensioning rod 3. When the tightening mechanism 4 drives the internal threaded tube 31 to tighten the tensioning rod 3, the rotation of the rotating shaft 43 simultaneously drives the linkage adjustment mechanism 52 to move, so that the arc-shaped support plate 53 is synchronously pressed against the coil winding 05 from the inside. This synchronization ensures that when the inner core body is subjected to the longitudinal tightening force of the upper clamping plate 1 and the lower clamping seat 2, it can also be subjected to the radial support force of the inner arc-shaped support plate 53, thereby avoiding lateral deformation of the inner core body due to longitudinal force, solving the problem that the traditional fastening method only relies on longitudinal tightening, which easily leads to uneven local force on the inner core body, and further improving the structural stability.

[0067] Furthermore, during a collision, the inner support mechanism 5 provides support to the wound core 04 and the coil winding 05 from the inside, thereby reducing the possibility of the wound core 04 and the coil winding 05 being excessively deformed by the impact and causing a short circuit.

[0068] Example 4

[0069] See also Figure 2 as well as Figure 11-13 The difference between this embodiment and embodiment 3 is that:

[0070] Specifically, an insulating tube 6 is sleeved on the outside of each tensioning rod 3, and a protective plate 7 is clamped and installed between the insulating tubes 6 on two adjacent tensioning rods 3 in the same fastening group, forming an outer protective structure 06 at the periphery between the upper clamping plate 1 and the lower clamping seat 2 to provide protection for the three inner cores from the outside.

[0071] Specifically, the insulating tube 6 is a hollow body, which is movably mounted on the tensioning rod 3, so that the insulating tube 6 can freely adjust its position along the axial direction of the tensioning rod 3, which can not only adapt to the position changes of the upper clamping plate 1 and the lower clamping seat 2 during the locking process of the tensioning rod 3, but also fine-tune its own position after the tensioning rod 3 is tightened, thereby providing an adaptation space for the installation of the protective plate 7; a plurality of slots 61 are evenly distributed on the outer wall of the insulating tube 6 and pass through the interior thereof, and the protective plate 7 is composed of an arc-shaped elastic part 71 and a card insertion part 72 respectively fixed at both ends of the arc-shaped elastic part 71, and the card insertion part 72 is inserted into the corresponding slot 61 on the insulating tube 6, and the curvature of the arc-shaped elastic part 71 is adapted to the outer periphery of the coil winding 05. This design can form an arc-shaped protection along the outer periphery of the coil winding 05.

[0072] In this embodiment, the formation and protective function of the outer protective structure 06 are achieved through the coordination of the tension rod 3, the insulating tube 6, and the protective plate 7. The specific working principle is to provide comprehensive protection for the three inner cores from the outside through the linkage and adaptation of each structure. The detailed principle is as follows:

[0073] After the tensioning rod 3 is inserted into the through-hole 32, the insulating tube 6 is placed between the upper clamping plate 1 and the lower clamping seat 2, and the central through-hole of the insulating tube 6 is ensured to correspond to the position of the through-hole 32. Then, the tensioning rod 3 is passed through the insulating tube 6 and fastened into the internal threaded tube 31.

[0074] During specific installation, for the same fastening group, the protective plate 7 needs to be clamped and installed between the insulating tubes 6 on the two adjacent tensioning rods 3, that is, the clamping parts 72 at both ends of a protective plate 7 are respectively inserted into the notches 61 of the two adjacent insulating tubes 6, and the adjacent insulating tubes 6 are connected as a whole through the plug-in cooperation of the clamping parts 72 and the notches 61. Since the notches 61 are evenly distributed on the outer wall of the insulating tube 6, the appropriate position of the notch 61 can be selected according to the actual spacing of the tensioning rods 3 to insert the clamping parts 72, ensuring that the installation angle and tension of the protective plate 7 are adapted to the outer shape of the inner core;

[0075] The arc-shaped elastic portion 71 has elastic force. When the inserting portion 72 is inserted into the slot 61, the arc-shaped elastic portion 71 bends and deforms, ensuring that the inserting portion 72 can be smoothly inserted into the slot 61, while also preventing the inserting portion 72 from escaping from the slot 61 at will.

[0076] As the insulating tubes 6 on all adjacent tensioning rods 3 in the same fastening group are connected through the protective plate 7, a ring-shaped protective structure consisting of the insulating tube 6 and the protective plate 7 will be formed around the single inner core; and the three circles of protective structures corresponding to the three inner cores are connected to each other, and finally a complete peripheral protective structure 06 is formed at the periphery between the upper clamping plate 1 and the lower clamping seat 2.

[0077] The outer protective structure 06 can not only block possible external collisions or foreign object intrusions, and prevent the coil winding 05 and the wound iron core 04 from being deformed due to external forces, but also disperse the local external forces to multiple insulating tubes 6 and the tensioning rod 3 through the arc characteristics of the arc-shaped elastic part 71, and then transmit them to the upper clamping plate 1 and the lower clamping seat 2 by the tensioning rod 3, and finally disperse them to the outer box of the transformer, thereby reducing the risk of local force concentration on the inner core and improving the overall anti-collision effect.

[0078] In addition, the design of the insulating tube 6 being movably sleeved on the tension rod 3 ensures that there is a buffering amount of movement between the insulating tube 6 and the tension rod 3 when there is a slight expansion and contraction due to temperature changes or vibrations, thereby preventing the peripheral protective structure 06 from being damaged by stress concentration caused by the rigid connection; at the same time, the arc-shaped structure of the arc-shaped elastic portion 71 has a certain elasticity, and can buffer energy through its own deformation when subjected to a slight impact, thereby further improving the protection effect.

[0079] In addition, the hollow design of the insulating tube 6 enables it to have good elastic deformation ability. When it is hit, it can absorb the collision energy through its own deformation processes such as collapse and bending, thereby greatly weakening the impact force transmitted to the tension rod 3; and the evenly distributed grooves 61 provide reserved space for the deformation of the insulating tube 6, so that it can undergo controllable deformation more smoothly when subjected to force, avoiding stress concentration that causes sudden breakage of the insulating tube 6, thereby consuming more of the collision energy in the deformation of the insulating tube 6, reducing the impact force borne by the tension rod 3, and effectively preventing the tension rod 3 from excessive bending, twisting and other deformations due to excessive force, thereby ensuring the structural stability of the tension rod 3.

[0080] In summary, through the movable set of the insulating tube 6 and the tensioning rod 3, the plug-in cooperation of the protective plate 7 and the insulating tube 6, and the curvature adaptation of the arc-shaped elastic part 71 and the coil winding 05, an outer protective structure 06 that fits the outer periphery of the inner core is formed, which realizes comprehensive protection of the three inner cores from the outside, and cooperates with the inner support and longitudinal tensioning structure to significantly improve the structural stability and impact resistance of the transformer inner core.

[0081] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. An oil-immersed three-dimensional wound core transformer, comprising a transformer outer box formed by a cover plate (02) covering the top of a housing (01), an inner core body in which a coil winding (05) is arranged on a wound core (04), and a tensioning mechanism for positioning and fixing the inner core body, characterized in that: The tensioning mechanism comprises an upper clamping plate (1), a lower clamping seat (2) and a tightening group, wherein the upper clamping plate (1) and the lower clamping seat (2) are respectively arranged at the upper and lower parts of the transformer outer box; The three inner cores are positioned between the upper clamping plate (1) and the lower clamping seat (2) and are arranged in a triangular shape. The upper clamping plate (1) and the lower clamping seat (2) are provided with three fastening groups, which correspond to the positions of the inner cores one by one. The fastening group comprises a plurality of internal threaded cylinders (31) spaced apart around the corresponding inner core, and each of the internal threaded cylinders (31) is rotatably mounted on the lower clamping seat (2); A screwing and fastening mechanism (4) is provided in the lower clamping seat (2), and the screwing and fastening mechanism (4) is used to adjust the synchronous rotation of each internal threaded cylinder (31) to achieve synchronous locking operation of each fastening group.

2. The oil-immersed three-dimensional wound core transformer according to claim 1, characterized in that: Insulating pads (03) are fixed on the lower surface of the upper clamping plate (1) and the upper surface of the lower clamping seat (2) at positions corresponding to the positions of the inner cores; Each of the insulating spacers (03) is provided with a positioning groove (031), and the positioning groove (031) is V-shaped; The two sides of the top of the winding core (04) are correspondingly mounted in the two corresponding positioning grooves (031) above, and the two sides of the bottom are correspondingly mounted in the two corresponding positioning grooves (031) below, so as to achieve positioning.

3. The oil-immersed three-dimensional wound core transformer according to claim 2, characterized in that: The tightening group also includes a plurality of tension rods (3); The upper clamping plate (1) is provided with through holes (32) at positions corresponding to the positions of the internally threaded cylinders (31); The bottom end of each tension rod (3) has a threaded portion adapted to the internal threaded barrel (31); After the tension rod (3) passes through the corresponding internal threaded barrel (31), it is screwed into the through hole (32) to achieve tension-type fastening.

4. The oil-immersed three-dimensional wound core transformer according to claim 1, characterized in that: The screwing and fastening mechanism (4) comprises a toothed disc (41), a driven gear (42), a driving gear (44) and an adjusting device; The lower clamping seat (2) has a cavity inside, and the toothed disc (41) is rotatably mounted on the top wall of the cavity at positions corresponding to the positions of the inner core bodies via a shaft; Each of the internally threaded cylinders (31) extends through the cavity and has a sealed bottom end; The driven gear (42) is fixed to the end of each internally threaded cylinder (31) located in the cavity; The toothed disc (41) and the three corresponding driven gears (42) are all meshed; A driving gear (44) is rotatably mounted on the top wall of the cavity between the three toothed discs (41) via a rotating shaft (43), and the driving gear (44) is meshed with the three toothed discs (41); The adjustment device is arranged in the cavity, and one end thereof extends through the outside of the lower clamping seat (2) and is used to drive the rotating shaft (43) to perform rotational adjustment.

5. The oil-immersed three-dimensional wound core transformer according to claim 4, characterized in that: The adjusting device includes a worm (45), a worm wheel (46) and a screwing portion (47); The worm wheel (46) is fixed on the rotating shaft (43), and the worm (45) is horizontally rotatably installed in the cavity and meshes with the worm wheel (46). One end of the worm (45) extends through the outside of the lower clamping seat (2) and is mounted with the screwing portion (47).

6. The oil-immersed three-dimensional wound core transformer according to claim 4, characterized in that: An inner support mechanism (5) is provided on the lower clamping seat (2) between the three inner core bodies, for providing support to the three inner core bodies from the inner side. The inner support mechanism (5) comprises a mounting platform (51), a linkage adjustment mechanism (52) and an arc-shaped support plate (53); The mounting platform (51) is fixed on the lower clamping seat (2) and is located between the three inner cores; The linkage adjustment mechanism (52) is vertically arranged on the top of the mounting platform (51); Three arc-shaped abutment plates (53) are arranged on the periphery of the mounting platform (51), and the positions of the arc-shaped abutment plates (53) and the coil windings (05) correspond one to one; The linkage adjustment mechanism (52) is linked with the rotating shaft (43) to move radially of the linkage arc-shaped support plate (53) until it contacts the outer wall of the coil winding (05) when the tightening mechanism (4) drives the internal threaded cylinder (31) to tighten the tensioning rod (3).

7. The oil-immersed three-dimensional wound core transformer according to claim 6, characterized in that: The linkage adjustment mechanism (52) comprises a bidirectional threaded rod (521), a mounting plate (522), a nut seat (523) and a traction arm (524); The mounting platform (51) is provided with three radially extending slide grooves (511), and the mounting plate (522) is slidably mounted in each of the three slide grooves (511); Three arc-shaped abutment plates (53) are respectively fixed on the corresponding mounting plates (522); The bidirectional threaded rod (521) is rotatably mounted on the mounting platform (51), and the two threaded portions on the bidirectional threaded rod (521) are respectively threadedly matched with the nut seats (523); Three nut seats (523) are correspondingly hingedly mounted on the two nut seats (523); The other ends of the two corresponding nut seats (523) are hinged to the corresponding mounting plates (522); The bottom end of the bidirectional threaded rod (521) extends through the cavity of the lower clamping seat (2) and is coaxially fixed with the rotating shaft (43).

8. The oil-immersed three-dimensional wound core transformer according to claim 6, characterized in that: A wedge-shaped stop block (54) is fixed on the top and bottom ends of each arc-shaped stop plate (53) and contacts and cooperates with two adjacent coiled iron cores (04).

9. The oil-immersed three-dimensional wound core transformer according to claim 3, characterized in that: An insulating tube (6) is sleeved on the outside of each tensioning rod (3), and a protective plate (7) is clamped and installed between the insulating tubes (6) on two adjacent tensioning rods (3) in the same fastening group, forming an outer protective structure (06) at the periphery between the upper clamping plate (1) and the lower clamping seat (2) to provide protection for the three inner cores from the outside.

10. The oil-immersed three-dimensional wound core transformer according to claim 9, characterized in that: The insulating cylinder (6) is a hollow body and is movably mounted on the tension rod (3); The outer wall of the insulating cylinder (6) is evenly distributed with a plurality of notches (61) that penetrate the interior thereof; The protective plate (7) is composed of an arc-shaped elastic portion (71) and a clamping portion (72) respectively fixed at both ends of the arc-shaped elastic portion (71); The inserting portion (72) is inserted into the corresponding notch (61) on the insulating cylinder (6); The arcuate elastic portion (71) is adapted to the outer periphery of the coil winding (05).

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