A transformer coil and a transformer having the coil

Abstract

This application discloses a transformer coil and a transformer having the coil. The coil includes: an upper pressure plate passing through the iron core and located above the coil body; a lower pressure plate passing through the iron core and located below the coil body; the lower pressure plate and the upper pressure plate are connected by an axial clamping assembly, which provides axial clamping force to the coil body; and a clamping plate facing the axial clamping assembly. When the axial clamping assembly reduces the distance between the upper and lower pressure plates, it simultaneously applies pressure to the clamping plate, causing the clamping plate to provide radial clamping force to the coil body. This application uses an axial clamping assembly to adjust the distance between the upper and lower pressure plates. When the axial clamping assembly reduces the distance between the two pressure plates to apply axial clamping force to the coil body, it can also cause the clamping plate to apply radial clamping force to the coil body. Moreover, the axial clamping assembly and the clamping plate are completely positioned between the two pressure plates, which not only reduces the volume of the coil but also provides good protection for the axial clamping assembly and the clamping plate from the pressure plates.

Description

Technical Field

[0001] This application relates to the field of power transmission and transformation equipment technology, and in particular to a transformer coil and a transformer having the coil. Background Technology

[0002] Transformers are commonly used power transmission and transformation equipment. They are usually installed near power plants, substations, or electrical equipment to step up or step down voltage and improve the efficiency of power transmission and transformation.

[0003] Currently, transformers are mainly of two types: dry-type and oil-immersed. Regardless of the type, transformers require coils, which are typically wound around the outside of the iron core. When a transformer experiences a short-circuit, a large current flows through the coil instantaneously. Under this high current, the coil generates a strong electromagnetic force, posing a risk of damage. Therefore, stable clamping of the coil is necessary. The commonly used clamping method involves applying external force in both the axial and radial directions to ensure the coil is tightly attached to the iron core, preventing damage from short-circuit current. For example, CN218123171U provides a coil structure that can simultaneously clamp the coil axially and radially, ensuring more stable coil operation through clamping in both directions.

[0004] However, the aforementioned patent uses the mutual squeezing of wedge blocks and limiting clamps to achieve radial clamping of the coil. The squeezing strip and wedge blocks need to pass through the limiting clamps and protrude from one end of the limiting clamps. This exposed structure increases the space occupied by the coil, which is not conducive to the miniaturization of the transformer. Moreover, the exposed structure cannot be effectively protected, which reduces the working reliability of the coil. Summary of the Invention

[0005] This application provides a transformer coil and a transformer having the coil, in order to solve the problems of large space occupation and lack of protection in the axial clamping method of the coil in the prior art.

[0006] On one hand, embodiments of this application provide a transformer coil, including:

[0007] Iron core;

[0008] The coil body is wound around the outside of the iron core;

[0009] The upper pressure plate passes through the iron core and is located at the top of the coil body;

[0010] The lower pressure plate passes through the iron core and is located at the bottom of the coil body. The lower pressure plate and the upper pressure plate are connected by an axial clamping assembly, which is used to adjust the distance between the upper pressure plate and the lower pressure plate to provide axial clamping force to the coil body.

[0011] The clamping plate is located between the upper and lower pressure plates and is set close to the coil body. The clamping plate is directly opposite the axial clamping assembly. When the axial clamping assembly reduces the distance between the upper and lower pressure plates, it applies pressure to the clamping plate, so that the clamping plate provides radial clamping force to the coil body.

[0012] On the other hand, embodiments of this application provide a transformer with a coil, including a housing and the aforementioned coil.

[0013] The transformer coil and the transformer having the coil disclosed in this application have the following advantages:

[0014] An axial clamping assembly is used to adjust the distance between the upper and lower pressure plates. A clamping plate is provided on the coil body and the axial clamping assembly. When the axial clamping assembly reduces the distance between the two pressure plates to apply an axial clamping force to the coil body, it can also apply pressure to the clamping plate, thereby causing the clamping plate to apply a radial clamping force to the coil body. Moreover, the axial clamping assembly and the clamping plate are completely located between the two pressure plates, which not only reduces the volume of the coil, but also provides good protection for the axial clamping assembly and the clamping plate from the pressure plates. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a transformer coil provided in an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the relaxed state of the axial clamping assembly in the first embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the clamping state of the axial clamping assembly in the first embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the relaxed state of the axial clamping assembly in the second embodiment of this application;

[0020] Figure 5 This is a schematic diagram of the clamping state of the axial clamping assembly in the second embodiment of this application;

[0021] Figure 6 This is a schematic diagram of the connection structure between the clamping plate and the pressure plate in an embodiment of this application.

[0022] Explanation of reference numerals: 100-Iron core, 110-Coil body, 200-Upper pressure plate, 210-Upper pull rod, 211-Upper screw connection, 212-Upper main clamping block, 300-Lower pressure plate, 301-Boss, 302-Slot, 303-Elastic element, 310-Lower pull rod, 311-Lower screw connection, 312-Lower main clamping block, 400-Clamping nut, 500-Clamping plate, 510-Upper secondary clamping block, 520-Lower secondary clamping block. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Figure 1-6 This application provides a schematic diagram of the structure of a transformer coil according to an embodiment of the present application. The embodiment of the present application provides a transformer coil, including:

[0025] Iron core 100;

[0026] The coil body 110 is wound around the outside of the iron core 100;

[0027] The upper pressure plate 200 passes through the iron core 100 and is located on the upper part of the coil body 110;

[0028] The lower pressure plate 300 passes through the iron core 100 and is located at the lower part of the coil body 110. The lower pressure plate 300 and the upper pressure plate 200 are connected by an axial clamping assembly. The axial clamping assembly is used to adjust the distance between the upper pressure plate 200 and the lower pressure plate 300 to provide axial clamping force to the coil body 110.

[0029] The clamping plate 500 is located between the upper pressure plate 200 and the lower pressure plate 300 and is set close to the coil body 110. The clamping plate 500 is directly opposite the axial clamping assembly. When the axial clamping assembly reduces the distance between the upper pressure plate 200 and the lower pressure plate 300, it simultaneously applies pressure to the clamping plate 500, so that the clamping plate 500 provides radial clamping force to the coil body 110.

[0030] For example, the iron core 100 has a cylindrical structure, and the coil body 110 is wound around the side of the iron core 100 near the center. Therefore, the coil body 110 is not wound around the two ends of the side of the iron core 100. The upper pressure plate 200 and the lower pressure plate 300 have the same diameter and are both annular plates. Their inner diameter is the same as the diameter of the iron core 100, and their outer diameter is larger than the outer diameter of the coil body 110, so that a portion of the upper pressure plate 200 and the lower pressure plate 300 protrudes from the coil body 110. After the upper pressure plate 200 and the lower pressure plate 300 pass through the top and bottom of the iron core 100 respectively and press onto the coil body 110, the upper pressure plate 200 and the lower pressure plate 300 can be connected by an axial clamping assembly, and the distance between them can be adjusted to apply an axial clamping force to the coil body 110.

[0031] While the axial clamping assembly applies an axial clamping force to the coil body 110, the positions of the upper pressure plate 200 and the lower pressure plate 300 relative to the coil body 110 change, while the clamping plate 500 remains stationary relative to the coil body 110. Therefore, the clamping plate 500, the upper pressure plate 200, and the lower pressure plate 300 will undergo relative positional movement. During this relative movement, the axial clamping assembly can apply pressure to the clamping plate 500, thereby causing the clamping plate 500 to apply a radial clamping force to the coil body 100. Under the action of the axial and radial clamping forces, the coil body 110 is stably bound to the outside of the iron core 100. Even if a short circuit causes a large current, the coil body 110 will not be damaged under the action of strong electromagnetic forces.

[0032] In one possible embodiment, the axial clamping assembly includes: an upper pull rod 210 connected to the bottom surface of the upper pressure plate 200, with an upper threaded portion 211 at the lower end of the upper pull rod 210; a lower pull rod 310 connected to the top surface of the lower pressure plate 300, with a lower threaded portion 311 at the upper end of the lower pull rod 310; and a clamping nut 400 screwed onto the upper threaded portion 211 and the lower threaded portion 311. When the clamping nut 400 is tightened, the upper threaded portion 211 and the lower threaded portion 311 move closer to each other, reducing the distance between the upper pressure plate 200 and the lower pressure plate 300.

[0033] For example, the upper screw connection 211 and the lower screw connection 311 extend away from the coil body 110 at the ends of the upper pull rod 210 and the lower pull rod 310, respectively. Moreover, the positions where the upper pull rod 210 and the lower pull rod 310 are connected to the upper pressure plate 200 and the lower pressure plate 300 are at a certain distance from the edges of the upper pressure plate 200 and the lower pressure plate 300. This distance is greater than or equal to the length of the upper screw connection 211 and the lower screw connection 311 in the horizontal direction, or the length component. Therefore, when the clamping nut 400 is screwed onto the two screw connections, the entire axial clamping assembly is located in the space between the upper pressure plate 200 and the lower pressure plate 300.

[0034] Furthermore, the upper threaded portion 211 and the lower threaded portion 311 are provided with threads on their opposite sides, which match the threads on the clamping nut 400. Moreover, the surfaces on the upper threaded portion 211 and the lower threaded portion 311 where the threads are located are arc surfaces, which match the surfaces on the internal threads of the clamping nut 400.

[0035] like Figure 2-5 As shown, the upper screw-in portion 211 and the lower screw-in portion 311 in this application have two forms. In the first form, the included angle between the upper screw-in portion 211 and the upper pull rod 210 is the same as the included angle between the lower screw-in portion 311 and the lower pull rod 310, and both are obtuse angles. The upper screw-in portion 211 moves closer to each other in a direction away from the upper pull rod 210 and the lower screw-in portion 311 moves closer to each other in a direction away from the lower pull rod 310.

[0036] By employing the aforementioned inclined upper threaded portion 211 and lower threaded portion 210, the surface containing the thread inside the clamping nut 400 can be parallel to the axis of the clamping nut 400; or the surface containing the thread inside the clamping nut 400 can also have a certain angle with the axis of the clamping nut 400, and the inclination angle of the surface containing the thread is the same as the inclination angle of the upper threaded portion 211 and the lower threaded portion 311. Regardless of whether the thread inside the clamping nut 400 adopts a parallel or conical structure, the effect of adjusting the distance between the two pressure plates can be achieved.

[0037] In the second form of the upper threaded portion 211 and the lower threaded portion 311, the upper threaded portion 211 and the lower threaded portion 311 are perpendicular to the upper pull rod 210 and the lower pull rod 310, respectively, and at least a portion of the surface containing the thread inside the clamping nut 400 is a conical surface.

[0038] In the first configuration, the distance that the upper pull rod 210 and the lower pull rod 310 move when the clamping nut 400 rotates one revolution is related to the tilt angle of the upper threaded part 211 and the lower threaded part 311. The larger the tilt angle, the greater the distance that the upper pull rod 210 and the lower pull rod 310 move. This configuration also has less requirement for the thickness of the clamping nut 400.

[0039] In the second configuration, the distance that the upper pull rod 210 and the lower pull rod 310 move when the clamping nut 400 rotates one revolution is related to the inclination angle of the internal thread of the clamping nut 400. The larger the inclination angle, the greater the distance that the upper pull rod 210 and the lower pull rod 310 move. However, this configuration requires a larger thickness for the clamping nut 400.

[0040] In one possible embodiment, slots 302 are provided on the bottom surface of the upper pressure plate 200 and the top surface of the lower pressure plate 300, and the upper and lower ends of the clamping plate 500 are respectively inserted into the slots 302 on the upper pressure plate 200 and the lower pressure plate 300.

[0041] For example, the depth of the slot 302 is less than the thickness of the pressure plate, that is, the slot 302 is a blind hole, so that the clamping plate 500 will not pass through the pressure plate. After the two ends of the clamping plate 500 are inserted into the slot 302, the clamping plate 500 can be positioned so that it is in the position facing the two pull rods and will not move at will. It also allows the clamping plate 500 to contact the entire coil body 110, thereby applying radial clamping force to the entire coil body 110.

[0042] In the embodiments of this application, an elastic element 303 is provided on the inner bottom surface of the slot 302, and the two ends of the clamping plate 500 abut against the two elastic elements 303 respectively. The elastic element 303 can be a coil spring or an elastic sheet. The elastic element 303 can keep the insertion depth of the clamping plate 500 in the two slots 302 consistent, and prevent the clamping plate 500 from being only inserted into the lower slot 302 due to gravity, while protruding from the upper slot 302.

[0043] In one possible embodiment, both the bottom surface of the upper pressure plate 200 and the top surface of the lower pressure plate 300 are provided with bosses 301, and slots 302 are provided on the bosses 301.

[0044] For example, the boss 301 protrudes from the bottom surface of the upper pressure plate 200 and the top surface of the lower pressure plate 300. Therefore, by setting the boss 301, the settable depth of the slot 302 can be increased, ensuring that the clamping plate 500 will not pass through the pressure plate while meeting the insertion requirements.

[0045] In one possible embodiment, the upper pull rod 210 is provided with an upper main clamping block 212 on the side facing the clamping plate 500, the lower pull rod 310 is provided with a lower main clamping block 312 on the side facing the clamping plate 500, and the clamping plate 500 is provided with an upper secondary clamping block 510 and a lower secondary clamping block 520 at positions corresponding to the upper main clamping block 212 and the lower main clamping block 312, respectively.

[0046] For example, one or more upper main clamping blocks 212 and lower main clamping blocks 312 can be provided. Regardless of how many upper main clamping blocks 212 and lower main clamping blocks 312 are provided, the upper slave clamping block 510 and the lower slave clamping block 520 need to correspond one-to-one with the upper main clamping block 212 and the lower main clamping block 312.

[0047] The upper main clamping block 212 and the upper secondary clamping block 510 are respectively set as inclined surfaces on their mutually facing sides. The angles of the inclined surfaces on the two clamping blocks relative to the vertical direction can be the same or different, but the inclination angles of the two clamping blocks need to be matched to maximize the contact area of ​​the two clamping blocks. Correspondingly, the lower main clamping block 312 and the lower secondary clamping block 520 are respectively set as inclined surfaces on their mutually facing sides. The angles of the inclined surfaces on the two clamping blocks relative to the vertical direction can be the same or different, but the inclination angles of the two clamping blocks need to be matched.

[0048] When the clamping plate 500 and the two tie rods move relative to each other, the vertical movement of the tie rods is converted into horizontal compression of the clamping plate 500 under the action of the clamping block, thereby generating radial clamping force.

[0049] This application also provides a transformer with a coil, including a housing and the aforementioned coil. The coil is disposed inside the housing. In addition to the housing and the coil, the transformer also includes other components, but the composition of these components and their installation positions inside or outside the housing are prior art and will not be described in detail here.

[0050] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0051] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A transformer coil, characterized in that, include: Iron core (100); The coil body (110) is wound around the outside of the iron core (100); The upper pressure plate (200) passes through the iron core (100) and is located on the upper part of the coil body (110); A lower pressure plate (300) passes through the iron core (100) and is located at the lower part of the coil body (110). The lower pressure plate (300) and the upper pressure plate (200) are connected by an axial clamping assembly, which is used to adjust the distance between the upper pressure plate (200) and the lower pressure plate (300) to provide axial clamping force to the coil body (110). A clamping plate (500) is located between the upper pressure plate (200) and the lower pressure plate (300) and is disposed in close contact with the coil body (110). The clamping plate (500) is directly opposite the axial clamping assembly. When the axial clamping assembly reduces the distance between the upper pressure plate (200) and the lower pressure plate (300), it simultaneously applies pressure to the clamping plate (500), so that the clamping plate (500) provides a radial clamping force on the coil body (110). The axial clamping assembly includes: The upper pull rod (210) is connected to the bottom surface of the upper pressure plate (200), and the lower end of the upper pull rod (210) is provided with an upper screw connection (211). A pull rod (310) is connected to the top surface of the lower pressure plate (300), and a lower screw connection (311) is provided at the upper end of the pull rod (310). A clamping nut (400) is screwed onto the upper screw connection (211) and the lower screw connection (311). When the clamping nut (400) is tightened, the upper screw connection (211) and the lower screw connection (311) move closer to each other, reducing the distance between the upper pressure plate (200) and the lower pressure plate (300). The upper pull rod (210) is provided with an upper main clamping block (212) on the side facing the clamping plate (500), and the lower pull rod (310) is provided with a lower main clamping block (312) on the side facing the clamping plate (500). The clamping plate (500) is provided with an upper secondary clamping block (510) and a lower secondary clamping block (520) at positions corresponding to the upper main clamping block (212) and the lower main clamping block (312), respectively.

2. A transformer coil according to claim 1, characterized in that, The angle between the upper screw connection (211) and the upper pull rod (210) is the same as the angle between the lower screw connection (311) and the lower pull rod (310), and both are obtuse angles. The upper screw connection (211) moves closer to each other in a direction away from the upper pull rod (210) and the lower screw connection (311) moves closer to each other in a direction away from the lower pull rod (310).

3. A transformer coil according to claim 2, characterized in that, The surface containing the internal thread of the clamping nut (400) is parallel to the axis of the clamping nut (400); or The surface where the thread is located inside the clamping nut (400) is at a certain angle to the axis of the clamping nut (400), and the inclination angle of the surface where the thread is located is the same as the inclination angle of the upper threaded part (211) and the lower threaded part (311).

4. A transformer coil according to claim 1, characterized in that, The upper threaded portion (211) and the lower threaded portion (311) are perpendicular to the upper pull rod (210) and the lower pull rod (310) respectively, and at least a portion of the surface where the thread inside the clamping nut (400) is located is a conical surface.

5. A transformer coil according to claim 1, characterized in that, The bottom surface of the upper pressure plate (200) and the top surface of the lower pressure plate (300) are provided with slots (302), and the upper and lower ends of the clamping plate (500) are respectively inserted into the slots (302) on the upper pressure plate (200) and the lower pressure plate (300).

6. A transformer coil according to claim 5, characterized in that, The inner bottom surface of the slot (302) is provided with an elastic element (303), and the two ends of the clamp (500) abut against the two elastic elements (303) respectively.

7. A transformer coil according to claim 5, characterized in that, The bottom surface of the upper pressure plate (200) and the top surface of the lower pressure plate (300) are both provided with bosses (301), and the slots (302) are provided on the bosses (301).

8. A transformer having a coil, characterized in that, Includes the housing and the coil as described in any one of claims 1-7.

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