An oil-immersed three-dimensional wound core transformer

Abstract

The present application relates to the technical field of transformer, specifically to an oil-immersed three-dimensional winding core transformer, comprising a transformer outer box formed by a cover plate cover arranged on the top of a shell, an inner core body formed by a coil winding arranged on a winding core, and a tensioning mechanism for positioning and fixing the inner core body, the tensioning mechanism comprising an upper clamp plate, a lower clamp seat and a fastening group, the upper clamp plate and the lower clamp seat are respectively arranged above and below in the transformer outer box; three inner core bodies are positioned between the upper clamp plate and the lower clamp seat and are arranged in a triangular shape. The present application can realize synchronous locking of the tensioning rod by setting a screwing fastening mechanism, and only single operation is needed to complete the fastening of multiple groups of tensioning rods, thereby improving the assembly efficiency. Meanwhile, the locking amount of each point is consistent when synchronous locking, which ensures that the upper clamp plate and the lower clamp seat are evenly stressed, avoids local stress concentration caused by fastening force difference, avoids the structural stability problem caused by uneven stress in traditional multi-bolt fastening, and improves the reliability of equipment operation.

Description

TECHNICAL FIELD

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

[0002] The oil-immersed three-dimensional wound core transformer is a power transformer with an insulation oil as a cooling medium and a three-phase three-dimensional wound core structure. The core is continuously wound and formed, and the magnetic circuit is symmetrical and reasonable. The transformer has low no-load loss, small operating noise, high energy efficiency and other characteristics, and is mainly used in power transmission and distribution systems to realize voltage conversion and power transmission, and is widely used in medium and large capacity scenarios.

[0003] The upper clamping plate and the lower clamping plate of the oil-immersed three-dimensional wound core transformer are usually connected by penetrating connection through insulation bolts to realize fastening. Insulating pads and other components are used to adjust the distance and ensure the insulation performance, so as to form a stable clamping structure, ensure that the core and winding are evenly stressed and stable during operation, and meet the electrical insulation requirements of the equipment.

[0004] Usually, multiple bolts are used for fastening. During assembly, multiple screws need to be screwed, which is complicated and inefficient. Moreover, the manual screwing of multiple bolts results in inconsistent fastening force, causing uneven stress on the upper clamping plate and the lower clamping plate, which may cause local deformation of the core or winding, affect the structural stability and equipment performance, and increase the risk of insulation failure or increased operating noise due to fastening deviation. SUMMARY

[0005] The present application aims to provide an oil-immersed three-dimensional wound core transformer to solve the technical problems in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions.

[0007] An oil-immersed three-dimensional wound core transformer includes a cover plate covering a transformer outer box formed on the top of a shell, a coil winding arranged on an inner core body formed by winding the core, and a tensioning mechanism for positioning and fixing the inner core body. The tensioning mechanism includes an upper clamping plate, a lower clamping seat and a fastening group. The upper clamping plate and the lower clamping seat are respectively arranged above and below the transformer outer box. Three inner core bodies are positioned between the upper clamping plate and the lower clamping seat and arranged in a triangular shape. Three fastening groups are arranged on the upper clamping plate and the lower clamping seat and correspond to the positions of the inner core bodies. The fastening group includes a plurality of inner threaded cylinders arranged around the corresponding inner core bodies. Each inner threaded cylinder is rotatably installed on the lower clamping seat. The lower clamping seat is provided with a screwing and fastening mechanism for adjusting the synchronous rotation of each inner threaded cylinder to realize synchronous locking operation of each fastening group.

[0008] Preferably, the upper clamping plate lower surface and the lower clamping base upper surface are fixed with insulating pads corresponding to the positions of the inner cores; the insulating pads are provided with positioning grooves in V shape; the top of the coil core is provided with two positioning grooves corresponding to the two sides of the upper clamping plate, and the bottom of the coil core is provided with two positioning grooves corresponding to the two sides of the lower clamping base, so as to realize positioning.

[0009] Preferably, the fastening group further comprises a plurality of tension rods; the upper clamping plate is provided with through holes corresponding to the positions of the inner threaded cylinders; the bottom end of each tension rod is provided with a threaded part matched with the inner threaded cylinder; the tension rod is matched and screwed into the through hole after passing through the corresponding inner threaded cylinder, so as to realize tension fastening.

[0010] Preferably, the screw fastening mechanism comprises a toothed disc, a driven gear, a driving gear and an adjusting device; the lower clamping base is provided with a cavity, and the toothed disc is rotatably installed on the top wall of the cavity corresponding to the positions of the inner cores through a shaft; the inner threaded cylinders extend through the cavity and are sealed at the bottom end; the inner threaded cylinders are fixed with the driven gears at the end in the cavity; the toothed disc and the three driven gears corresponding thereto are in meshing engagement; the driving gear is rotatably installed on the top wall of the cavity between the three toothed discs through a rotating shaft, and the driving gear is in meshing engagement with the three toothed discs; the adjusting device is arranged in the cavity and extends through one end to the outside of the lower clamping base, and is used to drive the rotating shaft to rotate and adjust.

[0011] Preferably, the adjusting device comprises a worm, a worm wheel and a screwing part; the worm wheel is fixed on the rotating shaft, the worm is rotatably installed in the cavity and is in meshing engagement with the worm wheel; one end of the worm extends through the lower clamping base to the outside and is provided with a screwing part.

[0012] Preferably, the lower clamping base is provided with an inner support mechanism between the three inner cores, which is used to provide support for the three inner cores from the inside; the inner support mechanism comprises a mounting table, a linkage adjusting mechanism and an arc-shaped resisting plate; the mounting table is fixed on the lower clamping base and located between the three inner cores; the linkage adjusting mechanism is vertically arranged on the top of the mounting table; the mounting table is provided with three arc-shaped resisting plates around, and the arc-shaped resisting plates correspond to the coil windings one by one; the linkage adjusting mechanism is linked with the rotating shaft, and when the screw fastening mechanism drives the inner threaded cylinder to screw and lock the tension rod, the arc-shaped resisting plate is moved radially until it abuts against the outer wall of the coil winding.

[0013] Preferably, the linkage adjusting mechanism comprises a bidirectional threaded rod, a mounting plate, a nut seat and a traction arm; the mounting table is provided with three radially extending sliding grooves, and the three sliding grooves are all limited to slide and mount the mounting plate; three arc-shaped abutting plates are fixed on the corresponding mounting plates respectively; the bidirectional threaded rod is rotatably installed on the mounting table, and the two threaded portions on the bidirectional threaded rod are respectively threadedly matched with the nut seat; the two nut seats are all correspondingly hingedly installed with three traction arms; the other ends of the upper and lower corresponding two traction arms are all hingedly connected with the corresponding mounting plate; and the bottom end of the bidirectional threaded rod penetrates and extends into the cavity of the lower clamping seat and is coaxially fixed with the rotating shaft.

[0014] Preferably, the wedge-shaped abutting blocks are fixed on the top end and the bottom end of each arc-shaped abutting plate.

[0015] Preferably, the outer part of each tension rod is sleeved with an insulating cylinder, and the insulating cylinders on the adjacent two tension rods in the same fastening group are clamped and installed with a protective plate to form a peripheral protection structure between the upper clamping plate and the lower clamping seat, so as to provide protection for the three inner core bodies from the outside.

[0016] Preferably, the insulating cylinder is a hollow body and is movably sleeved on the tension rod; a plurality of notches penetrating through the inside of the insulating cylinder are uniformly distributed on the outer wall of the insulating cylinder; the protective plate is composed of an arc-shaped elastic part and clamping parts fixed on both ends of the arc-shaped elastic part; the clamping parts are inserted into the notches on the corresponding insulating cylinder; and the arc degree of the arc-shaped elastic part is adapted to the deformation of the outer periphery of the coil winding.

[0017] Compared with the prior art, the application has the following advantages.

[0018] By arranging the screwing and fastening mechanism, the synchronous locking of the tension rods can be realized, and the fastening of multiple groups of tension rods can be completed by only one-time operation, so that the assembly efficiency is improved; meanwhile, the locking amount of each point is consistent when the points are synchronously locked, so that the stress on the upper clamping plate and the lower clamping seat is uniform, local stress concentration caused by the difference in fastening force is avoided, the problem of structural stability caused by uneven stress in the traditional multi-bolt fastening is avoided, and the reliability of equipment operation is improved.

[0019] The inner support mechanism is linked with the rotating shaft, and when the screwing and fastening mechanism drives the inner threaded cylinder to lock the tension rods, the linkage adjusting mechanism drives the arc-shaped abutting plates to move radially and abut against the coil winding, so that an inner support system is formed, a three-dimensional constraint is formed with the longitudinal tension of the upper clamping plate and the lower clamping seat, the lateral deformation of the coil winding and the wound iron core is effectively inhibited, the structural rigidity of the inner core body is greatly improved, and the fatigue life of the inner core body is prolonged.

[0020] The peripheral protection structure formed by the insulating cylinder and the protection plate forms a protection barrier in the periphery, the hollow structure of the insulating cylinder and the uniform distribution design of the slot cooperate with the arc-shaped adaptive characteristics of the arc-shaped elastic part, so that the external impact force can be dispersed to the plurality of tension rods and the upper clamping plate and the lower clamping seat, the energy is absorbed through multiple-stage buffering, the insulation damage or winding deformation caused by the direct action of external force on the wound iron core and the coil winding is reduced, and the impact resistance of the equipment is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure perspective view of the application;

[0022] Figure 2 It is a schematic view of the internal structure of the shell in the application;

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

[0024] Figure 4 It is Figure 3 The structure shown in the schematic view of the tension rod is omitted;

[0025] Figure 5 It is a schematic view of the positioning and installation of the wound iron core and the coil winding in the application;

[0026] Figure 6 It is a schematic view of the structure of the wound iron core positioned in the positioning groove in the application;

[0027] Figure 7 It is a schematic view of the detailed structure of the screwing and fastening mechanism in the application;

[0028] Figure 8 It is a schematic view of the internal support mechanism structure in the application;

[0029] Figure 9 It is a schematic view of the linkage adjusting mechanism structure in the application;

[0030] Figure 10 It is a schematic view of the distribution of the arc-shaped resistance plate and the wedge-shaped resistance block structure in the application;

[0031] Figure 11 It is a schematic view of the distribution of the insulating cylinder and the protection plate structure in the application;

[0032] Figure 12 It is a schematic view of the formation of the peripheral protection structure in the application;

[0033] Figure 13 It is a schematic view of the clamping connection of the protection plate and the insulating cylinder in the application.

[0034] In the figure: 01, shell; 02, cover plate; 03, insulating pad; 031, positioning groove; 04, iron core; 05, coil winding; 06, peripheral protection structure; 1, upper clamping plate; 2, lower clamping seat; 3, tension rod; 31, inner threaded cylinder; 32, through hole; 4, screw fastening mechanism; 41, toothed disc; 42, driven gear; 43, rotating shaft; 44, driving gear; 45, worm; 46, worm wheel; 47, screwing part; 5, inner support mechanism; 51, mounting table; 511, sliding groove; 52, linkage adjusting mechanism; 521, bidirectional threaded rod; 522, mounting plate; 523, nut seat; 524, traction arm; 53, arc-shaped resisting plate; 54, wedge-shaped resisting block; 6, insulating cylinder; 61, notch; 7, protection plate; 71, arc-shaped elastic part; 72, clamping part. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0036] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connection", "installation" should be understood in a broad sense, for example, "connection" can be detachable connection, or can be non-detachable connection; can be direct connection, or indirect connection through intermediate medium. In addition, "communication" can be direct communication, or indirect communication through intermediate medium. Among them, "fixing" means connecting with each other and the relative positional relationship after connection does not change. The orientation language mentioned in the embodiments of the present application, such as "inner", "outer", "top", "bottom", etc., is only the direction of the drawing, therefore, the orientation language used is to better, more clearly illustrate and understand the embodiments of the present application, and is not indicative or implied that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, therefore, it cannot be understood as a limitation on the embodiments of the present application.

[0037] In the embodiments of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features.

[0038] In the embodiments of the present application, "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0039] Reference in the specification to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in some embodiments" in various places in the specification are not necessarily all referring to the same embodiment, although it can. The terms "including," "comprising," "having" and variations thereof are meant to encompass the items listed thereafter and equivalents thereof as well as additional items.

[0040] Embodiment 1: Please refer to Figures 1-13 The application provides an oil-immersed three-dimensional roll core transformer, which comprises a cover plate 02, a shell 01, a coil winding 05 and a tensioning mechanism. The cover plate 02 is arranged on the top of the shell 01 to form a transformer outer box. The coil winding 05 is arranged on the inner core body formed by the roll core 04. The tensioning mechanism is used for positioning and fixing the inner core body. Specifically, the cover plate 02 is used for sealing the opening on the top of the shell 01. The roll core 04 has a frame-shaped three-dimensional winding structure. Three roll cores 04 are arranged in an equilateral triangle between the upper clamping plate 1 and the lower clamping base 2. The coil winding 05 is arranged at the connection position of each two roll cores 04, and the coil winding 05 covers the connection position of the two roll cores 04, so as to fix the two roll cores 04.

[0041] In addition, the cover plate 02 is provided with a wiring structure. The inner core body and the wiring structure are both prior art, and the specific structure and working principle will not be described in detail.

[0042] As shown in Figure 5 and Figure 6 , the lower surface of the upper clamping plate 1 and the upper surface of the lower clamping base 2 are both fixed with three insulating pads 03 corresponding to the positions of the inner core bodies. That is, the lower surface of the upper clamping plate 1 and the upper surface of the lower clamping base 2 are both fixed with three insulating pads 03. The insulating pad 03 can be circular or polygonal. In the present application, the insulating pad 03 is preferably circular.

[0043] The positions of the insulating pads 03 correspond to the positions of the inner core bodies one by one. Each insulating pad 03 is provided with a positioning groove 031. The positioning groove 031 is V-shaped and is used for accommodating two roll cores 04. In the specific installation, the top sides of the roll cores 04 are correspondingly clamped in the upper two positioning grooves 031, and the bottom sides of the roll cores 04 are correspondingly clamped in the lower two positioning grooves 031, so as to realize positioning. The roll cores 04 are clamped in the positioning grooves 031 to realize positioning. The coil winding 05 is arranged on the roll core 04. In this way, the roll core 04 and the coil winding 05 can be positioned and placed between the upper clamping plate 1 and the lower clamping base 2. The insulating pad 03 also provides insulation protection and buffering effect.

[0044] The tensioning mechanism comprises an upper clamping plate 1, a lower clamping base 2 and fastening groups, the upper clamping plate 1 and the lower clamping base 2 are respectively arranged above and below the outer box of the transformer, and both are hexagonal structures, the upper clamping plate 1 and the lower clamping base 2 are provided with three fastening groups, and the three fastening groups correspond to the positions of the inner core bodies one by one.

[0045] As Figures 2-4 The fastening group comprises a plurality of tensioning rods 3 and a plurality of inner threaded barrels 31 arranged at intervals around the corresponding inner core body, each inner threaded barrel 31 is rotatably installed on the lower clamping base 2, the bottom end of each tensioning rod 3 has a threaded part matched with the inner threaded barrel 31, and in addition, the upper clamping plate 1 is provided with through holes 32 corresponding to the positions of each inner threaded barrel 31, so that the tensioning rod 3 is matched and inserted.

[0046] In addition, the lower clamping base 2 is provided with a screwing fastening mechanism 4, which is used to adjust the synchronous rotation of each inner threaded barrel 31, so as to realize the synchronous locking operation of each fastening group.

[0047] After positioning each inner core body between the corresponding area of the upper clamping plate 1 and the lower clamping base 2, during fastening, first, the tensioning rod 3 is inserted through the corresponding through hole 32, and the bottom end of the tensioning rod 3 is inserted into each inner threaded barrel 31 one by one;

[0048] Then, by operating the screwing fastening mechanism 4, the synchronous rotation of each inner threaded barrel 31 can be driven, so as to realize the synchronous screwing of the inner threaded barrel 31, and by using the thread cooperation between the inner threaded barrel 31 and the bottom end of the tensioning rod 3, the synchronous locking of each tensioning rod 3 can be realized when each inner threaded barrel 31 rotates synchronously, so as to realize the tensioning of the upper clamping plate 1 and the lower clamping base 2, and finally realize the fixation of each inner core body.

[0049] Embodiment 2: please refer to Figure 7 This embodiment is used to further illustrate the screwing fastening mechanism 4 of embodiment 1, as follows:

[0050] The screwing fastening mechanism 4 comprises a gear disc 41, a driven gear 42, a driving gear 44 and an adjusting device, the lower clamping base 2 has a cavity, the gear disc 41 is rotatably installed on the top wall of the cavity corresponding to the position of each inner core body through a shaft, each inner threaded barrel 31 extends through the cavity and is sealed at the bottom end, the driven gear 42 is fixed on the end of the inner threaded barrel 31 in the cavity, the sealing of the bottom end of the inner threaded barrel 31 not only ensures the stable connection between the inner threaded barrel 31 and the driven gear 42, but also avoids the communication between the inside and outside of the cavity, the gear disc 41 and the three driven gears 42 corresponding thereto are engaged, the rotating shaft 43 is rotatably installed on the top wall of the cavity between the three gear discs 41, and the driving gear 44 is fixed on the rotating shaft 43 and engaged with the three gear discs 41.

[0051] The adjusting device is arranged in the cavity and extends through one end to outside of the lower clamp base 2 for driving the rotating shaft 43 to rotate and adjust, wherein the adjusting device specifically comprises a worm 45, a worm wheel 46 and a screwing part 47, the worm wheel 46 is fixed on the rotating shaft 43, the worm 45 is horizontally rotatably arranged in the cavity and is in meshing correspondence with the worm wheel 46, one end of the worm 45 extends through to outside of the lower clamp base 2 and is provided with the screwing part 47, and the screwing part 47 in the application is preferably a hexagonal end head which can be matched with a hexagonal wrench.

[0052] When the screwing part 47 is applied with operating force by the hexagonal wrench, the worm 45 connected with the screwing part 47 will rotate in the cavity, and since the worm 45 is in meshing with the worm wheel 46, the rotating worm 45 can meshingly drive the worm wheel 46 to rotate, thereby synchronously rotating the rotating shaft 43 and the driving gear 44;

[0053] The driving gear 44 is in meshing with the three toothed discs 41, and the three toothed discs 41 are rotatably arranged on the top wall in the cavity through shaft rods and correspond to the three inner cores in position, so that the driving gear 44 can meshingly drive the three toothed discs 41 to synchronously rotate when the driving gear 44 rotates, thereby ensuring the consistency of the three toothed discs 41.

[0054] When the toothed disc 41 rotates, it can drive the corresponding three driven gears 42 to synchronously rotate through the meshing relationship, thereby driving the inner threaded cylinder 31 fixed with the driven gear 42 to synchronously rotate on the lower clamp base 2, at this time, since the inner threaded cylinder 31 is matched with the threaded part at the bottom end of the tension rod 3, the synchronous rotation of the inner threaded cylinder 31 can drive each tension rod 3 to synchronously move upward or downward through the threaded cooperation, and when the inner threaded cylinder 31 rotates in the locking direction, the tension rod 3 will be gradually screwed into the perforation 32, thereby realizing the tensioning between the upper clamp plate 1 and the lower clamp base 2.

[0055] Through the above series of linkage, the tension rod 3 is finally acted on, thereby realizing the synchronous rotation of all the inner threaded cylinders 31, ensuring the synchronous locking of each tension rod 3, making the upper clamp plate 1 and the lower clamp base 2 bear force uniformly, thereby stably fixing the inner core between the two, and effectively solving the problems of complicated operation and inconsistent fastening force in the traditional multi-bolt fastening.

[0056] Embodiment 3: please refer to Figure 4 、 Figure 5 、 Figure 8 and Figure 9 On the basis of Embodiment 2, the oil-immersed three-dimensional wound core transformer with the inner support mechanism 5 provided in the embodiment is specifically as follows:

[0057] The inner support mechanism 5 is arranged between the three inner cores on the lower clamp base 2 and provides support for the three inner cores from the inner side. The inner support mechanism 5 comprises a mounting table 51, a linkage adjustment mechanism 52 and arc-shaped abutting plates 53. The mounting table 51 is fixed on the lower clamp base 2 and located between the three inner cores. The linkage adjustment mechanism 52 is vertically arranged on the top of the mounting table 51. The mounting table 51 is provided with three arc-shaped abutting plates 53 around the periphery, and the arc-shaped abutting plates 53 correspond to the positions of the coil windings 05. The linkage adjustment mechanism 52 is linked with the rotating shaft 43, and when the rotating fastening mechanism 4 drives the inner threaded cylinder 31 to rotate to lock the tension rod 3, the arc-shaped abutting plates 53 move radially until they abut against the outer wall of the coil winding 05. In addition, the wedge-shaped abutting blocks 54 are fixed on the top and bottom of each arc-shaped abutting plate 53. When the arc-shaped abutting plate 53 abuts against the outer wall of the corresponding coil winding 05, the wedge-shaped abutting blocks 54 abut against the adjacent two iron cores 04 at the same time.

[0058] Specifically, 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 table 51 is provided with three radially extending sliding grooves 511, and the mounting plate 522 is slidingly installed in each sliding groove 511. This limiting structure ensures that the mounting plate 522 can only move radially along the mounting table 51 and cannot deviate in other directions.

[0059] The three arc-shaped abutting plates 53 are fixed on the corresponding mounting plates 522. The bidirectional threaded rod 521 is rotatably installed on the mounting table 51. The two threaded parts of the bidirectional threaded rod 521 are threadedly matched with the nut seats 523. The two nut seats 523 are respectively hingedly installed with three traction arms 524. The other ends of the upper and lower traction arms 524 are hingedly connected with the corresponding mounting plates 522. The bottom end of the bidirectional threaded rod 521 extends into the cavity of the lower clamp base 2 and is coaxially fixed with the rotating shaft 43.

[0060] In this embodiment, the specific working principle of the inner support mechanism 5 is based on the linkage with the rotating fastening mechanism 4. When the tension rod 3 is synchronously locked, stable support is provided for the three inner cores from the inner side. The detailed process is as follows:

[0061] Firstly, when the screwing part 47 drives the worm 45 to rotate, the worm 45 meshes with the worm gear 46 to drive the rotating shaft 43 to rotate, and in turn synchronously drives the bidirectional threaded rod 521 to rotate, and the rotating bidirectional threaded rod 521 can threadedly drive the axial movement of the two nut seats 523, specifically, the mutual moving away or moving close to each other; when the rotating and fastening mechanism 4 locks the tension rod 3, the bidirectional threaded rod 521 threadedly drives the two nut seats 523 to move close to each other along the axial direction, the angle of the traction arm 524 is deflected due to the movement of the nut seat 523, and the thrust of the traction arm 524 is transmitted to the mounting plate 522 along the extension direction of the sliding groove 511 to push the mounting plate 522 to slide along the sliding groove 511 to the direction close to the inner core body; the arc-shaped abutting plate 53 is fixed on the corresponding mounting plate 522, so that the radial movement of the mounting plate 522 can synchronously drive the arc-shaped abutting plate 53 to move to the direction close to the inner core body, and finally the arc-shaped abutting plate 53 can gradually move close to and abut against the outer wall of the coil winding 05 to support the coil winding 05 from the inside.

[0062] In addition, when the arc-shaped abutting plate 53 abuts against the coil winding 05, the wedge-shaped abutting block 54 is in contact with the adjacent two coil cores 04 at the same time, on the one hand, the connection relationship between the coil core 04 and the coil winding 05 further enhances the support stability of the coil winding 05, and on the other hand, the wedge-shaped abutting block 54 limits the shaking of the coil core 04 by the abutting action, cooperates with the positioning action of the positioning groove 031 on the insulating pad 03 to the coil core 04, and makes the positioning of the inner core body between the upper clamping plate 1 and the lower clamping seat 2 more firm.

[0063] It is worth noting that the action of the inner support mechanism 5 is completely synchronized with the locking action of the tension rod 3, when the rotating and fastening mechanism 4 drives the inner threaded cylinder 31 to rotate to lock the tension rod 3, the rotation of the rotating shaft 43 simultaneously drives the linkage adjusting mechanism 52 to act, so that the arc-shaped abutting plate 53 abuts against the coil winding 05 from the inside at the same time, and the synchronization ensures that the inner core body can be simultaneously supported by the radial support force of the arc-shaped abutting plate 53 from the inside when the inner core body is subjected to the longitudinal tension force of the upper clamping plate 1 and the lower clamping seat 2, avoids the lateral deformation of the inner core body due to the longitudinal force, solves the problem that the traditional fastening mode only relies on the longitudinal tension to easily cause the uneven force of the inner core body, and further improves the structural stability.

[0064] In addition, when the collision occurs, the inner support mechanism 5 provides support to the coil core 04 and the coil winding 05 from the inside, reduces the excessive deformation of the coil core 04 and the coil winding 05 due to the impact, and avoids the short circuit.

[0065] Embodiment 4: please refer to Figure 2 and Figures 11-13 The difference between the present embodiment and embodiment 3 is that:

[0066] Specifically, the outer part of each tension rod 3 is sleeved with an insulating cylinder 6, and the insulating cylinders 6 on the adjacent two tension rods 3 in the same fastening group are clamped and installed with a protective plate 7, thereby forming a peripheral protection structure 06 between the upper clamping plate 1 and the lower clamping seat 2 to provide protection for the three inner cores from the outside.

[0067] Specifically, the insulating cylinder 6 is a hollow body and is movably sleeved on the tension rod 3, so that the insulating cylinder 6 can be freely adjusted in position along the axial direction of the tension rod 3, which can not only adapt to the position change of the upper clamping plate 1 and the lower clamping seat 2 during the locking of the tension rod 3, but also provide an adaptive space for the installation of the protective plate 7 through the self-position fine adjustment after the tension rod 3 is completed; a plurality of notches 61 penetrating through the insulating cylinder 6 are uniformly distributed on the outer wall of the insulating cylinder 6, the protective plate 7 is composed of an arc-shaped elastic part 71 and clamping and inserting parts 72 respectively fixed at both ends of the arc-shaped elastic part 71, the clamping and inserting parts 72 are inserted into the notches 61 on the corresponding insulating cylinder 6, and the arc of the arc-shaped elastic part 71 is adapted to the deformation of the outer periphery of the coil winding 05, which can form an arc-shaped protection along the outer periphery of the coil winding 05.

[0068] In the embodiment, the formation and protection of the peripheral protection structure 06 are realized based on the cooperation of the tension rod 3, the insulating cylinder 6 and the protective plate 7, and the specific working principle is that the structures are linked and adapted to form comprehensive protection for the three inner cores from the outside, and the detailed principle is as follows:

[0069] After the tension rod 3 is inserted into the through hole 32, the insulating cylinder 6 is correspondingly arranged between the upper clamping plate 1 and the lower clamping seat 2, and the center through hole of the insulating cylinder 6 is ensured to be in position corresponding to the through hole 32, and then the tension rod 3 is inserted through the insulating cylinder 6 and fastened in the inner threaded cylinder 31.

[0070] In the specific installation, for the same fastening group, the protective plate 7 needs to be clamped and installed between the insulating cylinders 6 on the adjacent two tension rods 3, that is, the clamping and inserting parts 72 at both ends of one protective plate 7 are inserted into the notches 61 of the adjacent two insulating cylinders 6, the adjacent insulating cylinders 6 are connected as a whole through the insertion and installation cooperation of the clamping and inserting parts 72 and the notches 61, and since the notches 61 are uniformly distributed on the outer wall of the insulating cylinder 6, the appropriate position of the notches 61 can be selected for inserting the clamping and inserting parts 72 according to the actual distance of the tension rod 3, so as to ensure that the installation angle of the protective plate 7 is adapted to the peripheral shape of the inner core.

[0071] Moreover, the arc-shaped elastic part 71 has elasticity, and when the clamping and inserting part 72 is inserted into the notch 61, the arc-shaped elastic part 71 is bent and deformed, which can ensure that the clamping and inserting part 72 can be smoothly inserted into the notch 61, and also avoid the clamping and inserting part 72 from being randomly taken out of the notch 61.

[0072] With the insulation cylinder 6 on all adjacent tension rods 3 in the same fastening group being connected through the protective plate 7, a single inner core body periphery will form a ring-shaped protective structure composed of the insulation cylinder 6 and the protective plate 7; and the three corresponding protective structures of the three inner core bodies are connected to each other, and finally form a complete peripheral protective structure 06 at the periphery between the upper clamping plate 1 and the lower clamping seat 2.

[0073] The peripheral protective structure 06 not only can block possible external collisions or foreign matter invasion, avoid deformation of the coil winding 05 and the iron core 04 due to external force, but also can disperse the local external force to the multiple insulation cylinders 6 and the tension rods 3 through the arc-shaped characteristics of the arc-shaped elastic part 71, and then transmit the force to the upper clamping plate 1 and the lower clamping seat 2 through the tension rods 3, and finally disperse to the transformer outer box, thereby reducing the risk of local stress concentration of the inner core body and improving the overall anti-collision effect.

[0074] In addition, the design that the insulation cylinder 6 is movably sleeved on the tension rod 3 ensures that there is a buffer movement amount when the insulation cylinder 6 and the tension rod 3 slightly stretch due to temperature changes or vibration, thereby avoiding damage of the peripheral protective structure 06 due to stress concentration caused by rigid connection; at the same time, the arc-shaped structure of the arc-shaped elastic part 71 has a certain elasticity, and can buffer energy through its own deformation when subjected to slight impact, thereby further improving the protection effect.

[0075] In addition, the hollow design of the insulation cylinder 6 has good elastic deformation capability, and can absorb collision energy through its own collapse, bending and other deformation processes when subjected to impact, thereby greatly weakening the impact force transmitted to the tension rod 3; and the uniformly distributed notches 61 provide a reserved space for the deformation of the insulation cylinder 6, so that the insulation cylinder 6 can more smoothly and controllably deform when subjected to stress, thereby avoiding sudden breakage of the insulation cylinder 6 due to stress concentration, so that more collision energy is consumed in the deformation of the insulation cylinder 6, the impact force borne by the tension rod 3 is reduced, and the tension rod 3 is effectively prevented from being excessively bent, twisted and deformed due to excessive stress, thereby ensuring the structural stability of the tension rod 3.

[0076] In summary, through the movable sleeving of the insulation cylinder 6 and the tension rod 3, the plug-in cooperation of the protective plate 7 and the insulation cylinder 6, and the arc adaptation of the arc-shaped elastic part 71 and the coil winding 05, the peripheral protective structure 06 is formed to fit the periphery of the inner core body, thereby achieving comprehensive protection of the three inner core bodies from the outside, and cooperating with the inside support and the longitudinal tensioning structure, thereby significantly improving the structural stability and impact resistance of the transformer inner core body.

[0077] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application.

Claims

1. An oil-immersed three-dimensional wound core transformer, comprising a transformer outer casing formed by a cover plate (02) covering the top of a housing (01), an inner core formed by coil windings (05) disposed on a wound core (04), and a tensioning mechanism for positioning and fixing the inner core, characterized in that: The tensioning mechanism includes an upper clamping plate (1), a lower clamping seat (2), and a fastening assembly. The upper clamping plate (1) and the lower clamping seat (2) are respectively located at the upper and lower parts of the transformer casing. The three inner cores are positioned between the upper clamping plate (1) and the lower clamping seat (2) and are arranged in a triangle. The upper clamping plate (1) and the lower clamping seat (2) are provided with three fastening groups, which correspond one-to-one with the positions of the inner cores. The fastening assembly includes a plurality of internally threaded cylinders (31) arranged at intervals around the corresponding inner core, and each of the internally threaded cylinders (31) is rotatably mounted on the lower clamp (2); The lower clamp (2) is provided with a screwing and fastening mechanism (4), which is used to adjust the synchronous rotation of each internal threaded cylinder (31) to achieve synchronous locking operation of each fastening group. The screwing and fastening mechanism (4) includes a gear plate (41), a driven gear (42), a drive gear (44), and an adjustment device; The lower clamp (2) has a cavity, and the gear plate (41) is rotatably installed on the top wall of the cavity at the position corresponding to the position of each inner core via a shaft. Each of the internally threaded cylinders (31) extends through into the cavity and is sealed at the bottom. Each of the internally threaded cylinders (31) has a driven gear (42) fixed on its end located inside the cavity. The toothed disc (41) and its three corresponding driven gears (42) are all meshed; A drive 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 drive gear (44) meshes with all three toothed discs (41); The adjustment device is located inside the cavity, and one end extends through to the outside of the lower clamp (2) to drive the rotating shaft (43) for rotation adjustment; The lower clamp (2) is provided with an inner support mechanism (5) located between the three inner cores, which is used to provide support for the three inner cores from the inside. The internal support mechanism (5) includes 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 clamp (2) and located between the three inner cores; The linkage adjustment mechanism (52) is vertically installed on the top of the mounting platform (51); The mounting platform (51) is surrounded by three arc-shaped abutments (53), and the positions of the arc-shaped abutments (53) correspond one-to-one with the coil windings (05); The linkage adjustment mechanism (52) is linked with the rotating shaft (43) to move the linkage arc-shaped abutment (53) radially until it abuts against the outer wall of the coil winding (05) when the screwing and fastening mechanism (4) drives the internal threaded cylinder (31) to screw and lock the tension rod (3).

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 the positions corresponding to the inner cores. Each of the insulating pads (03) is provided with a positioning groove (031), and the positioning groove (031) is V-shaped; The top two sides of the coiled iron core (04) are respectively fitted into the two corresponding upper positioning slots (031), and the bottom two sides are respectively fitted into the two corresponding lower positioning slots (031) to achieve positioning.

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

4. The oil-immersed three-dimensional wound core transformer according to claim 1, characterized in that: The adjusting device includes a worm (45), a worm wheel (46), and a screwing part (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 to the outside of the lower clamp (2) and is fitted with the screwing part (47).

5. The oil-immersed three-dimensional wound core transformer according to claim 1, characterized in that: The linkage adjustment mechanism (52) includes 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 installed in each of the three slide grooves (511). Three arc-shaped abutments (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 nut seat (523) is threadedly matched at the two threaded portions on the bidirectional threaded rod (521). Three traction arms (524) are respectively hinged on both of the nut seats (523). The other ends of the two corresponding traction arms (524) are hinged to the corresponding mounting plates (522); The bottom end of the bidirectional threaded rod (521) extends through into the cavity of the lower clamp (2) and is fixed coaxially with the rotating shaft (43).

6. The oil-immersed three-dimensional wound core transformer according to claim 1, characterized in that: Each of the arc-shaped abutment plates (53) has a wedge-shaped abutment block (54) fixed on its top and bottom ends to engage with the two adjacent iron cores (04).

7. The oil-immersed three-dimensional wound core transformer according to claim 3, characterized in that: Each of the tension rods (3) is fitted with an insulating sleeve (6). A protective plate (7) is clamped between the insulating sleeves (6) on two adjacent tension rods (3) in the same fastening group. An outer protective structure (06) is formed at the periphery between the upper clamp (1) and the lower clamp (2) to provide protection for the three inner cores from the outside.

8. The oil-immersed three-dimensional wound core transformer according to claim 7, 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 several slots (61) that communicate with its interior. The protective plate (7) is composed of an arc-shaped elastic part (71) and a snap-fit ​​part (72) fixed at both ends of the arc-shaped elastic part (71); The insert (72) is inserted into the slot (61) on the corresponding insulating cylinder (6); The arc of the arc-shaped elastic part (71) is adapted to the outer periphery of the coil winding (05).

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