Assembly type current transformer

Abstract

The utility model discloses an assembly type current transformer which comprises a transformer body and an assembly component, and the assembly component comprises an upper layer plate and a lower layer plate which can be separated. The upper-layer plate is an inverted U-shaped structural body composed of a transverse plate and a vertical plate, and the upper-layer plate and the mutual inductor main body are integrally formed on the upper surface of the transverse plate; the lower-layer plate comprises a clamping and embedding part, and the lower-layer plate can be embedded in the inverted-U-shaped structure of the upper-layer plate through the clamping and embedding part; side lug plates extend out of the two sides of the clamping and embedding part of the lower-layer plate, and threaded assembly holes used for being assembled and connected with an external assembly structure are formed in the side lug plates; matched plug-in mounting fastening structures are arranged in the middles of the opposite faces of the upper layer plate and the lower layer plate, and limiting protrusions and clamping grooves matched with the limiting protrusions are formed in the outer sides of the plug-in mounting fastening structures. The utility model has the advantages of wide operation space, high assembly efficiency, stable and reliable structure and convenience in disassembly and maintenance.

Description

Technical Field

[0001] The utility model relates to a current transformer technology in the field of electrical technology, in particular to an assembled current transformer. Background Art

[0002] Current transformer is an electrical device that converts large primary current into small secondary current for measurement based on the principle of electromagnetic induction. It is usually composed of a closed iron core and windings, including primary winding and secondary winding. The primary winding has few turns and is connected in series in the circuit of the current to be measured, while the secondary winding has more turns and is connected in series in the measuring instrument and protection circuit to provide the necessary signals for the instrument and protection equipment.

[0003] At present, the current transformer widely used in the market mainly includes a transformer body and a strip bottom plate fixedly connected to the bottom. The strip bottom plate has threaded holes on both sides of the corresponding transformer body, and uses this as an assembly interface. However, when actually applied to external assembly structures such as equipment boxes or assembly brackets, since the threaded holes of the strip bottom plate are located directly below the transformer body, when using tools to screw the locking parts, the operating space between the tool and the transformer body appears cramped. This limited operating space not only affects the convenience of operation, restricts the range of torque application, and thus reduces assembly efficiency, but also easily causes the risk of the current transformer falling off due to loosening due to insufficient tightness, posing a potential threat to the safe operation of the equipment.

[0004] Therefore, it is particularly important to optimize and upgrade the existing current transformer assembly structure to improve operational convenience and safety performance. Utility Model Content

[0005] The technical problem solved by the utility model is to provide an assembled current transformer to solve the defects in the above technical background.

[0006] The technical problem solved by the utility model is achieved by the following technical solutions:

[0007] An assembled current transformer comprises a transformer body and an assembly component, wherein the assembly component is a double-layer structure, comprising a separable upper plate and a lower plate;

[0008] The upper plate includes a horizontal plate and vertical plates formed on both sides of the horizontal plate, the horizontal plate and the vertical plates are formed as one body, and together form an inverted U-shaped structure, and the upper plate is formed as one body with the transformer body on the upper surface of the horizontal plate;

[0009] The lower plate includes a clamping portion, which is an inverted U-shaped structure matching the upper plate, and the lower plate can be embedded in the inverted U-shaped structure of the upper plate through the clamping portion; the lower plate has side ear plates extending from both sides of the clamping portion, and the side ear plates are provided with threaded assembly holes for assembly and connection with an external assembly structure;

[0010] The upper plate and the lower plate are provided with matching plug-in fastening structures at the middle positions of the opposite surfaces, and a limiting protrusion and a slot matching the limiting protrusion are formed on the outer side of the plug-in fastening structure.

[0011] As a further limitation, the upper plate is obtained by cutting a whole piece of DT4 electrical pure iron plate and bending it on both sides.

[0012] As a further limitation, the lower layer plate is formed by cutting a whole piece of DT4 electrical pure iron plate and bending it twice on both sides.

[0013] As a further limitation, the upper plate is formed with a countersunk threaded hole on the back side, and the transformer body is fixedly assembled with the upper plate by a combination of a clamping structure pre-fixed at the bottom and connected with a countersunk screw at the countersunk threaded hole.

[0014] As a further limitation, the height of the embedded portion on the lower plate is based on the convenience of inserting fingers into and operating the plug-in fastening structure;

[0015] The height of the embedding portion on the lower plate is preferably 30-60 mm.

[0016] As a further limitation, the plug-in fastening structure is a threaded plug-in fastening structure, which includes a screw and a matching nut, wherein the screw base is formed on the bottom surface of the upper plate, and a plug-in seat matching the screw is formed on the lower plate; when fastening, the screw is downwardly inserted into the plug-in seat and extends out of the plug-in seat at the lower end of the plug-in seat, and the nut is screwed on the protruding end of the screw to complete the fastening operation;

[0017] The nut is a hand-tightened nut with a torque amplification structure, preferably a butterfly-shaped hand-tightened nut, a plum-shaped hand-tightened nut, and a compass-shaped hand-tightened nut.

[0018] As a further limitation, the plug-in fastening structure is a screw-on buckle, which includes a waist-shaped block, which is assembled on the bottom surface of the upper plate through a guide rod with a pre-tensioning spring; the waist-shaped block is formed with a protrusion at the center position of the circle on both sides; and a waist-shaped hole for the waist-shaped block to pass through is formed on the lower plate, and clamping holes matching the protrusions are formed on both sides of the waist-shaped hole; when fastening, the waist-shaped block is first passed through the waist-shaped hole, and after passing through the waist-shaped hole, force is applied to the waist-shaped block to resist the pre-tensioning spring and then rotated, so that the protrusions on both sides of the waist-shaped block can be clamped into the clamping holes to complete the fastening operation.

[0019] Beneficial effect: The utility model adopts an assembled current transformer with a double-layer assembly component, which can convert a single assembly of the current transformer on an external assembly structure such as an equipment box or an assembly bracket into two combined assemblies of a lower plate and an external assembly structure and an upper plate (together with the transformer body) and a lower plate. On the one hand, this combined assembly method can greatly broaden the operating space, allowing assemblers to perform the screwing operation of the locking parts more conveniently and freely, thereby significantly improving the assembly efficiency; at the same time, it can also improve the stability and reliability of the assembled structure through the snap-in assembly method between the upper plate and the lower plate, effectively avoiding the risk of the current transformer falling off due to loosening; and it is easy to disassemble and replace components, reducing the time cost of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a preferred embodiment of the utility model.

[0021] Among them: 1. Side ear plate; 2. Threaded assembly hole; 3. Lower plate; 4. Limiting protrusion; 5. Insertion seat; 6. Screw; 7. Nut; 8. Upper plate; 9. Transformer body. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0023] See also Figure 1A preferred embodiment of an assembled current transformer is provided. In this embodiment, the assembled current transformer includes a transformer body 9 and an assembly component, wherein the assembly component includes an independently formed upper plate 8 and a lower plate 3. The upper plate 8 is cut from a whole piece of DT4 electrical pure iron plate, and then bent once on both sides using a bending machine to form the upper plate 8 as a whole after being formed. The upper plate 8 after being formed is an inverted U-shaped structure; while the lower plate 3 is cut from a whole piece of DT4 electrical pure iron plate, and then bent twice on both sides using a bending machine to form the lower plate 3 after being formed. The middle part of the lower plate 3 after being formed is a card-embedded part, which is an inverted U-shaped structure matching the size of the upper plate 8, and can be embedded in the concave position of the lower surface of the upper plate 8 in the manner shown in the figure. At the same time, the lower plate 3 is also formed with side ear plates 1 protruding outward on both sides of the card-embedded part.

[0024] In different embodiments, the upper plate 8 is connected to the transformer body 9 by a specific fixing method, and the fixing method is a structural fixing method already available in the prior art, such as snap-in, plug-in, threaded connection, welding, chemical bonding, etc. Specifically, in this embodiment, a combined assembly method of snap-in and threaded connection is used. In order to achieve the above connection and assembly, the upper plate 8 is formed with a countersunk threaded hole on the back side, and the transformer body 9 is pre-fixed at the bottom by a snap-in structure, and after pre-fixation, the threaded hole corresponding to the bottom of the transformer body 9 is overlapped with the countersunk threaded hole on the upper plate 8, and the countersunk screw is screwed in after the overlap, so as to achieve the fixed assembly of the upper plate 8 and the transformer body 9, so as to ensure the stability and reliability of the structural connection.

[0025] The lower plate 3 has side ear plates 1 extending from both sides of the embedding portion. The side ear plates 1 are provided with threaded assembly holes 2 for assembly connection with an external assembly structure including an equipment box or an assembly bracket.

[0026] In order to achieve the connection and assembly of the upper plate 8 and the lower plate 3 and to improve the convenience and stability of assembly, a matching plug-in fastening structure is provided at the middle position of the opposite surfaces of the upper plate 8 and the lower plate 3.

[0027] In this embodiment, the plug-in fastening structure adopts a threaded plug-in fastening method, including a screw rod 6 and a matching nut 7. The base of the screw rod 6 is formed on the bottom surface of the upper plate 8, and a plug-in seat 5 matching the screw rod 6 is formed on the lower plate 3. During assembly, the screw rod 6 is inserted downward into the plug-in seat 5 and extends out of the lower end of the plug-in seat 5, and then the nut 7 is screwed on the extended end of the screw rod 6 to complete the fastening operation; this plug-in fastening structure is not only simple in structure, but also can effectively fasten the upper plate 8 and the lower plate 3 together.

[0028] In order to improve the convenience of operation, the nut 7 of this embodiment uses a hand-tightened nut with a torque amplification structure, such as a butterfly hand-tightened nut, which makes it more convenient for the assembler to apply torque during operation, thereby improving the assembly efficiency; and in order to further facilitate the operation of the nut 7, the locking portion of the lower plate 3 should leave an appropriate height dimension (30~60mm) to facilitate the insertion of fingers or tools to screw the nut 7.

[0029] In this embodiment, the upper plate 8 and the lower plate 3 are further provided with a limiting protrusion 4 and a slot matching the limiting protrusion 4 on the outer side of the plug-in fastening structure. This limiting structure can prevent relative displacement between the upper plate 8 and the lower plate 3 by locking the limiting protrusion 4 in the slot after the upper plate 8 and the lower plate 3 are assembled, thereby ensuring the stability and safety of the entire assembled current transformer.

[0030] In other embodiments, the threaded plug-in fastening method of the plug-in fastening structure can also be replaced by a screw-on buckle, and the effect is similar; specifically, the screw 6 in the embodiment is replaced by a screw-on buckle, and the screw-on buckle includes a guide rod, the base of the guide rod is integrally formed with the upper plate 8, and a waist-shaped block is mounted on the guide rod. The waist-shaped block has two dot-shaped protrusions on the surface on the side close to the upper plate 8. In addition, a spring with pre-tensioning mounted on the guide rod is fixed on the waist-shaped block.

[0031] Correspondingly, a waist-shaped hole is formed on the lower plate for the waist-shaped block to pass through, and clamping holes matching the dot-shaped protrusions are formed on both sides of the waist-shaped hole. During assembly, the waist-shaped block is first passed through the waist-shaped hole, and then after the waist-shaped block passes through the waist-shaped hole, appropriate force is applied to the waist-shaped block to resist the elastic force of the preload spring, so that the waist-shaped block can rotate smoothly, thereby clamping the dot-shaped protrusions on both sides into the clamping holes on the lower plate to complete the fastening operation. This rotary buckle structure not only simplifies the assembly process and improves assembly efficiency, but also ensures the stability and reliability of the assembly.

[0032] The technical solution of this embodiment adopts a double-layer assembly assembly of an upper plate 8 and a lower plate 3, which can convert one assembly into two combined assemblies during the assembly process, greatly broadening the operating space and improving the assembly efficiency. At the same time, the stability and reliability of the assembled structure are ensured by the embedded assembly method between the upper plate and the lower plate and the setting of the plug-in fastening structure, effectively avoiding the risk of the current transformer falling off due to looseness. In addition, this assembled structure is also convenient for the disassembly and replacement of components, reducing the time cost of maintenance.

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the purpose of these embodiments is only to illustrate the utility model and is not intended to limit the scope of protection of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all of these equivalent forms also fall within the scope of protection defined by the claims attached to this application.

Claims

1. An assembled current transformer, characterized in that: It includes a transformer body and an assembly component, wherein the assembly component is a double-layer structure, including a separable upper plate and a lower plate; The upper plate includes a horizontal plate and vertical plates formed on both sides of the horizontal plate, the horizontal plate and the vertical plates are formed as one body, and together form an inverted U-shaped structure, and the upper plate is formed as one body with the transformer body on the upper surface of the horizontal plate; The lower plate includes a clamping portion, which is an inverted U-shaped structure matching the upper plate, and the lower plate can be embedded in the inverted U-shaped structure of the upper plate through the clamping portion; the lower plate has side ear plates extending from both sides of the clamping portion, and the side ear plates are provided with threaded assembly holes for assembly and connection with an external assembly structure; The upper plate and the lower plate are provided with matching plug-in fastening structures at the middle positions of the opposite surfaces, and a limiting protrusion and a slot matching the limiting protrusion are formed on the outer side of the plug-in fastening structure.

2. The assembled current transformer according to claim 1, characterized in that: The upper plate is formed by cutting a whole piece of DT4 electrical pure iron plate and bending it at both sides.

3. The assembled current transformer according to claim 1, characterized in that: The lower layer plate is formed by cutting a whole piece of DT4 electrical pure iron plate and bending it twice on both sides.

4. The assembled current transformer according to claim 1, characterized in that: The upper plate is formed with a countersunk threaded hole on the back side, and the mutual inductor body is fixedly assembled with the upper plate by a combination of a clamping structure pre-fixed at the bottom and connected with a countersunk screw at the countersunk threaded hole.

5. The assembled current transformer according to claim 1, characterized in that: The height of the embedding portion on the lower plate is determined so as to facilitate the insertion of fingers and the operation of the insertion and fastening structure.

6. The assembled current transformer according to claim 5, characterized in that: The height of the embedding portion on the lower plate is 30-60 mm.

7. The assembled current transformer according to claim 1, characterized in that: The plug-in fastening structure is a threaded plug-in fastening structure, which includes a screw and a matching nut. The base of the screw is formed on the bottom surface of the upper plate, and a plug-in seat matching the screw is formed on the lower plate. When fastening, the screw is downwardly passed through the plug-in seat and extends out of the plug-in seat at the lower end of the plug-in seat, and the nut is screwed on the protruding end of the screw to complete the fastening operation.

8. The assembled current transformer according to claim 7, characterized in that: The nut is a hand-tightened nut with a torque amplification structure, and the hand-tightened nut is one of a butterfly-shaped hand-tightened nut, a plum-shaped hand-tightened nut, and a compass-shaped hand-tightened nut.

9. The assembled current transformer according to claim 1, characterized in that: The plug-in fastening structure is a screw-on buckle, which includes a waist-shaped block, which is assembled on the bottom surface of the upper plate through a guide rod with a pre-tightening spring; the waist-shaped block is formed with a protrusion at the center position of the circle on both sides; and a waist-shaped hole for the waist-shaped block to pass through is formed on the lower plate, and clamping holes matching the protrusions are formed on both sides of the waist-shaped hole; when fastening, the waist-shaped block is first passed through the waist-shaped hole, and after passing through the waist-shaped hole, force is applied to the waist-shaped block to resist the pre-tightening spring and then rotated, so that the protrusions on both sides of the waist-shaped block can be clamped into the clamping holes to complete the fastening operation.

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