Iron core clamping device and transformer

Abstract

The utility model discloses a kind of iron core clamping devices and transformer, iron core clamping device includes: clamping assembly, clamping assembly is equipped with two groups, two groups of clamping assembly are located at the front and rear of iron core;Pull belt, the upper and lower ends of clamping assembly are equipped with pull belt respectively, and the front and rear ends of each pull belt are connected with two groups of clamping assembly respectively;Ground foot, ground foot is located at the lower end of clamping assembly, and the front and rear ends of ground foot are connected with two groups of clamping assembly respectively;Ceiling, ceiling is located at the upper end of clamping assembly, and the front and rear ends of ceiling are connected with two groups of clamping assembly respectively.The utility model can provide reliable clamping force to iron core, avoid the failure of iron core clamping device under the condition of transformer operation or short circuit, so as to avoid the failure of coil compression system, and can reduce noise when operating, reduce no-load current and no-load loss, also can avoid insulation failure due to violent vibration and mechanical displacement.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to core clamping device and transformer. Background Technology

[0002] The core clamping device is a key mechanical support and fixing structure inside the transformer. Its main functions are to press and fix the silicon steel sheets of the core to prevent them from loosening and vibrating; and to support and fix the windings, providing them with a mechanical basis for short-circuit resistance.

[0003] In related technologies, the core clamping device clamps the core by setting frame-like clamping members on both sides of the core, and uses a strap to connect and fasten the clamping members on both sides, resulting in low overall strength. When a transformer experiences a short circuit, the core clamping device is subjected to mechanical stress (such as bending, tension, vibration and impact) transmitted by huge electrodynamic forces, which may lead to deformation of the clamping members and failure of the fastening system.

[0004] When the clamping components deform or fail to tighten, they lose their clamping force on the core laminations, compromising their fixing effect on the core and windings. This leads to core loosening, significantly reducing the transformer's mechanical strength and affecting operational safety. Abnormal noise (such as a clanging sound) will be generated during operation, and no-load current and no-load losses will increase. Simultaneously, severe vibration and mechanical displacement may wear down the insulation of the clamping components, winding insulation paper tubes, and lead insulation layers, creating potential insulation fault points. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a core clamping device and a transformer.

[0006] The solution to the technical problem of this utility model is: Firstly, a core clamping device is proposed for use in transformers with cores, comprising: The clamping assembly is provided in two sets, with the two sets of clamping assemblies located on the front and rear sides of the iron core, respectively. The clamping assembly has pull straps at its upper and lower ends, and each pull strap is connected to two sets of clamping assemblies at its front and rear ends. The foot is located at the lower end of the clamping assembly, and the front and rear ends of the foot are respectively connected to two sets of the clamping assemblies; The top beam is located at the upper end of the clamping assembly, and its front and rear ends are respectively connected to two sets of the clamping assemblies.

[0007] This invention has at least the following beneficial effects: the pull strap is a flexible connection, capable of tightening the two sets of clamping components and counteracting outward tension. The top beam and bottom feet are rigid connections, simultaneously counteracting tension and contraction forces during transformer operation. Through the coordinated use of the pull strap, top beam, and bottom feet, the clamping force of the clamping components on the core during transformer operation can be improved, increasing clamping reliability and preventing core clamping device failure during transformer operation or short circuits. This avoids coil clamping system failure, reduces operating noise, lowers no-load current and no-load loss, and prevents insulation faults caused by severe vibration and mechanical displacement.

[0008] As a further improvement to the above technical solution, the top beam includes a steel plate and at least two locking screws. The steel plate extends in the front-to-back direction, and the front and rear ends of the steel plate are detachably connected to the clamping assembly through the locking screws.

[0009] As a further improvement to the above technical solution, the top beam also includes two reinforcing support plates. The reinforcing support plates are U-shaped and are respectively located at the front and rear ends of the steel plate and connected to the lower surface of the steel plate. The lower end face of the reinforcing support plate abuts against the clamping assembly.

[0010] As a further improvement to the above technical solution, at least three top beams are provided, and the multiple top beams are arranged in a left-right direction, with the spacing between two adjacent top beams being equal.

[0011] As a further improvement to the above technical solution, multiple pull straps are provided at the upper and lower ends of the clamping assembly, and the pull straps at the upper end of the clamping assembly are respectively provided between two adjacent top beams.

[0012] As a further improvement to the above technical solution, each clamping assembly includes an upper clamp, a pull screw, and a lower clamp, with the upper and lower ends of the pull screw connected to the upper clamp and the lower clamp, respectively.

[0013] As a further improvement to the above technical solution, each set of clamping components has at least three pull screws located in the same set of clamping components. The pull screws are arranged in a left-right direction, and the spacing between two adjacent pull screws is equal.

[0014] As a further improvement to the above technical solution, positioning holes are provided at both the front and rear ends of the foot, and the positioning holes are used to cooperate with the positioning pins of the transformer tank.

[0015] As a further improvement to the above technical solution, the iron core clamping device also includes a side screw, which is located at the left or right end of the clamping assembly. The side screw extends in the front-back direction, and its front and rear ends are respectively connected to two sets of the clamping assemblies.

[0016] Secondly, a transformer is proposed, including a core clamping device as described in any of the above technical solutions.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the iron core clamping device according to an embodiment of the present utility model; Figure 2 This is a schematic diagram illustrating the use of the iron core clamping device according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the top beam according to an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the foot of this utility model embodiment; Figure 5 This is a schematic diagram of the pull strap structure according to an embodiment of the present invention.

[0020] Reference numerals: 100, clamping assembly; 110, upper clamp; 111, first mounting slot; 120, lower clamp; 121, second mounting slot; 122, reinforcing rib; 130, pull screw; 200, pull strap; 210, strap body; 220, U-ring; 230, connecting block; 300, foot; 310, positioning hole; 400, top beam; 410, steel plate; 420, locking screw; 430, reinforcing support plate; 500, side screw; 600, iron core. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0022] In the description of this utility model, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. The various technical features of this utility model can be combined interactively without contradicting each other.

[0026] Reference Figure 1 and Figure 2 Firstly, this utility model embodiment proposes a core clamping device that can provide reliable clamping force to the core 600, avoiding failure of the core clamping device under transformer operation or short circuit conditions, thereby avoiding failure of the coil clamping system, reducing noise during operation, reducing no-load current and no-load loss, and also avoiding insulation failure caused by severe vibration and mechanical displacement.

[0027] Understandably, the core clamping device is used in a transformer with a core 600. The core clamping device includes clamping components 100, pull straps 200, foot anchors 300, and a top beam 400. Two sets of clamping components 100 are provided, located on the front and rear sides of the core 600, respectively. Pull straps 200 are provided at the upper and lower ends of each clamping component 100, with both ends of each strap connecting to the two sets of clamping components 100, providing a flexible connection. Foot anchors 300 are located at the lower end of the clamping components 100, with both ends connected to the two sets of clamping components 100. The top beam 400 is located at the upper end of the clamping components 100, with both ends connected to the two sets of clamping components 100. The foot 300 and the top beam 400 provide a rigid connection for the two sets of clamping assemblies 100.

[0028] Understandably, during transformer operation, the core 600 provides both outward tension and inward contraction force to the two sets of clamping assemblies 100. The tension strap 200, being a flexible connection, can tighten the two sets of clamping assemblies 100 and counteract the outward tension. The top beam 400 and the bottom foot 300, being rigid connections, can simultaneously counteract both tension and contraction forces during transformer operation. Through the coordinated use of the tension strap 200, top beam 400, and bottom foot 300, the clamping force of the clamping assemblies 100 on the core 600 can be increased during transformer operation, improving clamping reliability and preventing the core 600 from loosening.

[0029] In some embodiments, refer to Figure 3 The top beam 400 includes a steel plate 410 and at least two locking screws 420. The steel plate 410 extends in the front-to-back direction, and its front and rear ends are detachably connected to the clamping assembly 100 via the locking screws 420. Specifically, the clamping assembly 100 has a mounting surface for connecting to the top beam 400. The locking screws 420 pass through the steel plate 410 and the mounting surface and are locked by nuts. For easier installation, the upper end of the clamping assembly 100 is provided with a first mounting groove 111, the upper wall of which is the mounting surface. The first mounting groove 111 of the clamping assembly 100 located on the front side opens forward, while the first mounting groove 111 of the clamping assembly 100 located on the rear side opens rearward. During installation, the operator can insert a nut from the opening of the first mounting groove 111 and lock the locking screws 420.

[0030] In some embodiments, the top beam 400 further includes two reinforcing support plates 430. The reinforcing support plates 430 are U-shaped and are respectively disposed at the front and rear ends of the steel plate 410, and connected to the lower surface of the steel plate 410. The lower surface of the reinforcing support plates 430 abuts against the clamping assembly 100. Specifically, the reinforcing support plate 430 on the front clamping assembly 100 opens forward, while the reinforcing support plate 430 on the rear clamping assembly 100 opens rearward. By adding U-shaped reinforcing support plates 430, the height of the iron core 600 can be matched, allowing the steel plate 410 and the clamping assembly 100 to contact each other through the reinforcing support plates 430, ensuring the connection strength between the clamping assembly 100 and the top beam 400, and improving the reliability of the connection.

[0031] In some embodiments, at least three top beams 400 are provided, arranged in a left-right direction, and the spacing between two adjacent top beams 400 is equal. It is understood that providing multiple top beams 400 can further improve the connection strength between the two clamping assemblies 100 and avoid the clamping failure of the clamping assembly 100 on the iron core 600.

[0032] In some embodiments, multiple pull straps 200 are provided at the upper and lower ends of the clamping assembly 100, and the pull straps 200 at the upper end of the clamping assembly 100 are respectively arranged between two adjacent top beams 400. This arrangement allows the flexible connecting force provided by the pull straps 200 and the rigid connecting force provided by the top beams 400 to work together more effectively, further improving the reliability of clamping and preventing the iron core 600 from loosening.

[0033] In some embodiments, the number of pull straps 200 on the upper and lower sides is the same, and their positions correspond one-to-one. At least three feet 300 are provided, the number of which is the same as the number of top beams 400, and the positions of the feet 300 correspond one-to-one with those of the top beams 400. This arrangement ensures that the clamping assembly 100 is subjected to uniform force on both the upper and lower sides, further reducing deformation and guaranteeing effective clamping of the iron core 600.

[0034] In some embodiments, there are two pull straps 200 on the upper and lower sides, and three each on the top beam 400 and the bottom anchor 300.

[0035] In some embodiments, each clamping assembly 100 includes an upper clamp 110, a pull screw 130, and a lower clamp 120. The upper and lower ends of the pull screw 130 are connected to the upper clamp 110 and the lower clamp 120, respectively. The upper clamp 110 and the lower clamp 120 are connected by the pull screw 130, so that the clamping assembly 100 forms a frame structure as a whole. By adjusting the pull screw 130, the distance between the upper clamp 110 and the lower clamp 120 can be adjusted, thereby improving the versatility of the clamping assembly 100 and the stability of clamping the iron core 600. Specifically, the upper and lower ends of the pull screw 130 are respectively provided with threaded structures. The upper end of the pull screw 130 passes through the upper clamp 110, and the lower end of the pull screw 130 passes through the lower clamp 120. During installation, the upper and lower ends of the pull screw 130 are locked by nuts. Since the upper end face of the iron core 600 is in contact with the top beam 400 and the lower end face of the iron core 600 is in contact with the bottom foot 300, after the pull screw 130 is locked, the upper clamp 110 of the two sets of clamping components 100, the lower clamp 120 of the two sets of clamping components 100, the top beam 400 and the bottom foot 300 can fix the outer periphery of the iron core 600 and prevent the iron core 600 from loosening.

[0036] In some embodiments, the first mounting groove 111 is provided at the upper clamp 110, and the mounting surface for connecting with the top beam 400 is the upper wall surface of the upper clamp 110.

[0037] In some embodiments, each clamping assembly 100 has at least three pull rods 130, located in the same clamping assembly 100. The pull rods 130 are arranged in a left-right direction, and the spacing between adjacent pull rods 130 is equal. This arrangement can further prevent deformation of the clamping assembly 100, improve the stability of the clamping assembly 100, and thus ensure the clamping effect on the iron core 600.

[0038] In this embodiment, each clamping assembly 100 has four pull screws 130.

[0039] In some embodiments, refer to Figure 4 The front and rear ends of the foot 300 are respectively provided with positioning holes 310. The positioning holes 310 are used to cooperate with the oil tank of the transformer to effectively prevent the iron core 600 from moving horizontally and play a limiting role.

[0040] In some embodiments, the foot 300 and the lower clamp 120 are connected by bolts. The lower clamp 120 is provided with a second mounting groove 121. The second mounting groove 121 of the lower clamp 120 located on the front side opens forward, and the second mounting groove 121 of the lower clamp 120 located on the rear side opens rearward. The bolt passes through the lower groove wall of the foot 300 and the second mounting groove 121 and is locked by a nut. It is understood that the nut can be placed into the second mounting groove 121 through the opening position of the second mounting groove 121 to lock the bolt.

[0041] In some embodiments, the core clamping device further includes a reinforcing rib 122, which is disposed in the second mounting groove 121 and connected to the upper and lower groove walls of the second mounting groove 121 to improve the strength of the lower clamp 120.

[0042] In some embodiments, the core clamping device further includes a side screw 500, which is disposed at the left or right end of the clamping assembly 100. The side screw 500 extends in the front-rear direction, and its front and rear ends are respectively connected to two sets of clamping assemblies 100. Specifically, the left and right ends of the two upper clamping members 110 are respectively connected and locked by two side screws 500, and the left and right ends of the two lower clamping members 120 are respectively connected and locked by two side screws 500. This arrangement can further improve the connection strength between the two sets of clamping assemblies 100 to ensure the clamping force on the core 600.

[0043] In some embodiments, refer to Figure 5 Each pull strap 200 includes a strap body 210 and two connectors, which are respectively connected to the front and rear ends of the strap body 210. Specifically, the connectors include U-shaped rings 220 and two connecting blocks 230. The two ends of the strap body 210 are respectively connected to the U-shaped rings 220 of the two connectors. The clamping assembly 100 is provided with multiple sets of mounting holes, each set of mounting holes having two mounting holes. The two ends of the U-shaped ring 220 are provided with threaded structures, and the two ends of the U-shaped ring 220 respectively pass through the two mounting holes in the same set of mounting holes, and respectively pass through the two connecting blocks 230, and are locked with nuts. This design is more conducive to the installation and selection of the pull strap 200.

[0044] In some embodiments, the mounting hole of the upper clamp 110 is disposed on the upper groove wall of the first mounting groove 111 and communicates with the first mounting groove 111. During installation, the connecting block 230 of the upper pull strap 200 is disposed in the first mounting groove 111, the opening of the U-ring 220 faces downward, and the lower end of the U-ring 220 passes through the mounting hole of the upper clamp 110 and the connecting block 230 located in the first mounting groove 111. The nut for locking the U-ring 220 is located on the lower side of the connecting block 230.

[0045] In some embodiments, the mounting hole of the lower clamp 120 is disposed on the upper groove wall of the second mounting groove 121 and communicates with the second mounting groove 121. During installation, the connecting block 230 of the pull strap 200 located on the lower side is disposed in the second mounting groove 121, the opening of the U-ring 220 faces downward, and the lower end of the U-ring 220 passes through the mounting hole of the lower clamp 120 and the connecting block 230 located in the second mounting groove 121. The nut for locking the U-ring 220 is located on the lower side of the connecting block 230.

[0046] Secondly, embodiments of this utility model also provide a transformer, which includes a core clamping device as described in any of the embodiments of the first aspect. It is understood that, referring to... Figure 2 The transformer also includes an iron core 600, which is disposed between two sets of clamping components 100 of the iron core clamping device and is clamped and stabilized by the iron core clamping device.

[0047] Since the transformer uses the aforementioned core clamping device, it also possesses all the beneficial effects brought about by the aforementioned core clamping device, which will not be elaborated upon here.

[0048] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A core clamping device, characterized in that, Applied to transformers with iron cores, including: The clamping assembly is provided in two sets, with the two sets of clamping assemblies located on the front and rear sides of the iron core, respectively. The clamping assembly has pull straps at its upper and lower ends, and each pull strap is connected to two sets of clamping assemblies at its front and rear ends. The foot is located at the lower end of the clamping assembly, and the front and rear ends of the foot are respectively connected to two sets of the clamping assemblies; The top beam is located at the upper end of the clamping assembly, and its front and rear ends are respectively connected to two sets of the clamping assemblies.

2. The core clamping device according to claim 1, characterized in that, The top beam includes a steel plate and at least two locking screws. The steel plate extends in the front-to-back direction, and its front and rear ends are detachably connected to the clamping assembly via the locking screws.

3. The core clamping device according to claim 2, characterized in that, The top beam also includes two reinforcing support plates, which are U-shaped. The two reinforcing support plates are respectively located at the front and rear ends of the steel plate and connected to the lower surface of the steel plate. The lower end face of the reinforcing support plate abuts against the clamping assembly.

4. The core clamping device according to claim 3, characterized in that, The top beam is provided with at least three beams, and the multiple top beams are arranged in a left-right direction, with the spacing between two adjacent top beams being equal.

5. The core clamping device according to claim 4, characterized in that, Multiple pull straps are provided at the upper and lower ends of the clamping assembly, and the pull straps at the upper end of the clamping assembly are respectively provided between two adjacent top beams.

6. The core clamping device according to claim 1, characterized in that, Each clamping assembly includes an upper clamp, a pull screw, and a lower clamp, with the upper and lower ends of the pull screw connected to the upper clamp and the lower clamp, respectively.

7. The core clamping device according to claim 6, characterized in that, Each set of clamping assemblies has at least three pull screws located in the same set of clamping assemblies. The pull screws are arranged in a left-right direction, and the spacing between two adjacent pull screws is equal.

8. The iron core clamping device according to claim 1, characterized in that, The front and rear ends of the base are respectively provided with positioning holes, which are used to cooperate with the positioning pins of the transformer tank.

9. The core clamping device according to claim 1, characterized in that, The iron core clamping device also includes a side screw, which is located at the left or right end of the clamping assembly. The side screw extends in the front-back direction, and its front and rear ends are respectively connected to two sets of the clamping assemblies.

10. A transformer, characterized in that, Includes the iron core clamping device as described in any one of claims 1 to 9.

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