Through-wall totally-enclosed current transformer

Abstract

The utility model discloses a wall-through type totally-enclosed current transformer which comprises a wall surface and a transformer body installed in the wall surface through a fixing plate, the outer side of the fixing plate is covered with a protective cover, the side end of the protective cover is fixedly provided with a positioning ring, the outer end of the fixing plate is fixedly provided with an arc-shaped blocking frame, the arc-shaped blocking frame is internally provided with a pressing piece, and the pressing piece is fixedly connected with the fixing plate. An elastic locking block is arranged in the positioning ring, and a positioning groove is formed in the arc-shaped blocking frame. According to the protective device, firstly, the locating ring is pressed inwards through the pressing piece, it is guaranteed that when the protective cover is arranged on the outer side of the fixing plate in a covering mode, the protective cover and the fixing plate are in a pressed state, and the protective effect on the mutual inductor body is achieved; and the arc-shaped buckle is bounced into the positioning groove under the action of the compression spring, so that the protective cover can be compressed and fixed, and the purpose of facilitating operation and use of personnel is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, in particular to a through-the-wall fully enclosed current transformer. Background Art

[0002] Current transformer is an important electrical measuring instrument in power system. Its main function is to convert large current on the primary side into small current on the secondary side for measurement and relay protection.

[0003] Through-the-wall fully enclosed current transformers usually adopt epoxy resin casting, fully enclosed, through-the-wall structure, which provides good insulation performance and mechanical strength. In the prior art, according to patent application number: CN202222086958.X, a through-the-wall fully enclosed current transformer. The transformer body is shielded by a protective cover to prevent dust from accumulating on the surface during the assembly and use of the transformer. However, in this application, the protective cover is pushed so that the protective cover is engaged with the positioning ring to position the protective cover. Although this fixing method can facilitate the operation of personnel, it is not squeezed between the protective cover and the wall, which leads to dust or water vapor easily coming into contact with the current transformer through the gap between the protective cover and the wall when the protective cover is fixed, which is not conducive to its long-term use.

[0004] In view of the above-mentioned defects, a through-the-wall fully enclosed current transformer is provided. Utility Model Content

[0005] The purpose of the utility model is to solve the above problems and to propose a through-the-wall fully enclosed current transformer.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a through-wall fully enclosed current transformer, including a wall, a transformer body installed in the wall through a fixing plate, the outer cover of the fixing plate is provided with a protective cover, the side end of the protective cover is fixedly provided with a positioning ring, the outer end of the fixing plate is fixedly provided with an arc-shaped retaining frame which is rotatably embedded in the positioning ring, a clamping piece is provided in the arc-shaped retaining frame, an elastic locking block is provided in the positioning ring, and a positioning groove is formed in the arc-shaped retaining frame to fit the elastic locking block and be embedded.

[0007] Preferably, the pressing member comprises a first docking block fixedly arranged at the inner end of the arc-shaped retaining frame, and when the positioning ring is screwed into the arc-shaped retaining frame, the first docking block presses the positioning ring onto the fixing plate.

[0008] Preferably, the elastic locking block comprises a groove formed in the positioning ring, an arc-shaped buckle is rotatably connected in the groove, and a compression spring for pressing the arc-shaped buckle outward is embedded in the groove.

[0009] Preferably, a stopper is fixedly provided at the outer end of the docking block, and when the arc-shaped buckle rotates with the positioning ring and is embedded in the positioning groove, the stopper abuts against the side end of the arc-shaped stopper to limit the rotation of the positioning ring.

[0010] Preferably, a button is slidably connected to the arc-shaped retaining frame, and the arc-shaped buckle is withdrawn from the positioning groove by pressing the button.

[0011] Preferably, a flexible pad is fixedly provided at one end of the positioning ring close to the fixing plate.

[0012] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0013] 1. In the present application, when the positioning ring is screwed into the arc-shaped retaining frame, the positioning ring is pressed inwardly by the clamping member, so that the end of the positioning ring and the protective cover are pressed against the outer end surface of the fixed plate, ensuring that when the protective cover is arranged on the outside of the fixed plate, the protective cover and the fixed plate are in a pressed state, thereby preventing dust or water vapor from penetrating into the protective cover through the connecting gap, thereby playing a protective role in the transformer body.

[0014] 2. In the present application, the user only needs to rotate the protective cover and screw the positioning ring into the arc-shaped retaining frame until the arc-shaped buckle rotates with the positioning ring and is aligned with the positioning groove. The arc-shaped buckle will bounce into the positioning groove under the action of the compression spring to complete the compression and fixation of the protective cover, thereby achieving the purpose of facilitating operation and use by personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a mutual inductor provided according to an embodiment of the utility model is shown;

[0016] Figure 2 A schematic cross-sectional view of a mutual inductor provided according to an embodiment of the utility model is shown;

[0017] Figure 3 A schematic diagram of the matching structure of the positioning ring and the arc-shaped retaining frame provided according to an embodiment of the utility model is shown;

[0018] Figure 4 A schematic diagram of the inner structure of the arc-shaped retaining frame provided according to an embodiment of the utility model is shown;

[0019] Figure 5 A schematic side-sectional structure diagram of a protective cover provided according to an embodiment of the utility model is shown.

[0020] Legend:

[0021] 1. Wall; 2. Transformer body; 3. Fixing plate; 4. Arc-shaped retaining frame; 401. Positioning groove; 5. Button; 6. Protective cover; 7. Positioning ring; 701. Groove; 8. Flexible pad; 9. Docking block; 10. Stopper; 11. Arc-shaped buckle; 12. Compression spring. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-Figure 5 As shown, the utility model provides a technical solution: a through-wall fully enclosed current transformer, comprising a wall 1, a transformer body 2 installed in the wall 1 through a fixing plate 3, an outer cover of the fixing plate 3 is provided with a protective cover 6, a positioning ring 7 is fixedly provided on the side end of the protective cover 6, an outer end of the fixing plate 3 is fixedly provided with an arc-shaped retaining frame 4 which is rotatably embedded in the positioning ring 7, a clamping piece is provided in the arc-shaped retaining frame 4, an elastic locking block is provided in the positioning ring 7, and a positioning groove 401 which is embedded in the arc-shaped retaining frame 4 is formed to cooperate with the elastic locking block.

[0024] When the positioning ring 7 is screwed into the arc-shaped retaining frame 4, the positioning ring 7 is pressed inwardly by the clamping piece, so that the positioning ring 7 and the end of the protective cover 6 are pressed against the outer end surface of the fixed plate 3. When the elastic locking block is buckled into the positioning groove 401, the fixing of the protective cover 6 is completed, ensuring that when the protective cover 6 is arranged on the outside of the fixed plate 3, the protective cover 6 and the fixed plate 3 are in a pressed state, thereby preventing dust or water vapor from penetrating into the protective cover 6 through the connecting gap, thereby playing a protective role in the transformer body 2.

[0025] Specifically, Figure 1-Figure 5 As shown, the pressing member includes a first docking block 9 fixed to the inner end of the arc-shaped retaining frame 4 . When the positioning ring 7 is screwed into the arc-shaped retaining frame 4 , the first docking block 9 presses the positioning ring 7 onto the fixing plate 3 .

[0026] Matching inclined surfaces are formed on the opposite ends of the first docking block 9 and the positioning ring 7. When the positioning ring 7 is screwed into the arc-shaped retaining frame 4, the first docking block 9 slides along the surface of the positioning ring 7. The inclined surface of the first docking block 9 slides on the inclined surface of the positioning ring 7, and the positioning ring 7 is pressed toward the fixing plate 3.

[0027] Specifically, Figure 3 As shown, the elastic locking block includes a groove 701 formed in the positioning ring 7, an arc-shaped buckle 11 is rotatably connected in the groove 701, and a compression spring 12 for pressing the arc-shaped buckle 11 outward is embedded in the groove 701.

[0028] When the positioning ring 7 is screwed into the arc-shaped retaining frame 4, the arc-shaped buckle 11 first retracts into the groove 701 under the pressure of the inner wall of the arc-shaped retaining frame 4, until the arc-shaped buckle 11 is aligned with the positioning groove 401 as the positioning ring 7 rotates. Then, the arc-shaped buckle 11 will bounce into the positioning groove 401 under the action of the compression spring 12.

[0029] The outer end of the docking block 9 is fixed with a stopper 10. When the arc buckle 11 is inserted into the positioning groove 401 as the positioning ring 7 rotates, the stopper 10 abuts against the side end of the arc-shaped stopper 4 to limit the rotation of the positioning ring 7. Figure 3 In the orientation shown, when the block 10 abuts against the arc-shaped baffle 4, the arc-shaped buckle 11 buckles into the positioning groove 401, and the arc-shaped baffle 4 restricts the positioning ring 7 fixed with the block 10 from continuing to rotate counterclockwise, while the arc-shaped buckle 11 restricts the positioning ring 7 from rotating clockwise with the protective cover 6, thereby achieving the purpose of restricting the protective cover 6 from rotating at will.

[0030] A button 5 is slidably connected in the arc-shaped retaining frame 4 , and the arc-shaped buckle 11 is withdrawn from the positioning groove 401 by pressing the button 5 . A flexible pad 8 is fixedly disposed at one end of the positioning ring 7 close to the fixing plate 3 .

[0031] By pressing the button 5, the inward end of the button 5 squeezes the arc buckle 11. When the arc buckle 11 is disengaged from the positioning groove 401, the user can rotate the protective cover 6 until the positioning ring 7 slides out of the arc retaining frame 4, and then the protective cover 6 can be pulled away from the transformer body 2, thereby achieving the purpose of facilitating operation and use.

[0032] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A through-the-wall fully enclosed current transformer, comprising a wall (1), and a transformer body (2) mounted in the wall (1) via a fixing plate (3), characterized in that: The outer cover of the fixing plate (3) is provided with a protective cover (6), a positioning ring (7) is fixedly provided on the side end of the protective cover (6), an arc-shaped retaining frame (4) is fixedly provided on the outer end of the fixing plate (3) and is rotatably embedded in the positioning ring (7), a pressing piece is provided in the arc-shaped retaining frame (4), an elastic locking block is provided in the positioning ring (7), and a positioning groove (401) is formed in the arc-shaped retaining frame (4) and is embedded in the elastic locking block.

2. A through-the-wall fully enclosed current transformer according to claim 1, characterized in that: The pressing member comprises a first docking block (9) fixedly arranged at the inner end of the arc-shaped retaining frame (4); when the positioning ring (7) is screwed into the arc-shaped retaining frame (4), the first docking block (9) presses the positioning ring (7) onto the fixing plate (3).

3. A through-the-wall fully enclosed current transformer according to claim 2, characterized in that: The elastic locking block comprises a groove (701) formed in the positioning ring (7), an arc-shaped buckle (11) is rotatably connected in the groove (701), and a compression spring (12) for pressing the arc-shaped buckle (11) outwards is embedded in the groove (701).

4. A through-the-wall fully enclosed current transformer according to claim 3, characterized in that: A stopper (10) is fixedly provided at the outer end of the docking block (9); when the arc-shaped buckle (11) rotates with the positioning ring (7) and is embedded in the positioning groove (401), the stopper (10) abuts against the side end of the arc-shaped stopper (4) to limit the rotation of the positioning ring (7).

5. A through-the-wall fully enclosed current transformer according to claim 4, characterized in that: A button (5) is slidably connected to the arc-shaped retaining frame (4), and the arc-shaped buckle (11) is withdrawn from the positioning groove (401) by pressing the button (5).

6. A through-the-wall fully enclosed current transformer according to claim 1, characterized in that: A flexible pad (8) is fixedly provided at one end of the positioning ring (7) close to the fixing plate (3).

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