Clip-on current transformer

Abstract

The utility model relates to a pincerlike current transformer, which comprises a left shell and a right shell, the left shell is formed by folding a left front shell and a left rear shell, the right shell is formed by folding a right front shell and a right rear shell, and the lower parts of the left shell and the right shell are rotatably connected through hole-shaft matching. The upper portion of the left shell and the upper portion of the right shell are rotationally opened and rotationally closed through hole shaft matching, right grooves are formed in the inner sides, close to the left shell, of the right front shell and the right rear shell, and coaxial pivot joint shafts are arranged in the right grooves of the right front shell and the right rear shell. A left groove is formed in the inner side, close to the right shell, of the left front shell and the inner side, close to the right shell, of the left rear shell, a rod piece used for preventing the left shell and the right shell from being opened is arranged between the left groove and the right groove, a pivoting hole is formed in one end of the rod piece, and the rod piece is in rotating fit with a pivoting shaft in the right groove through the pivoting hole. The other end of the rod piece is provided with an arc rod head which is movably connected with the left groove in an abutting mode.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, specifically to a clamp-on current transformer. Background Technology

[0002] A current transformer consists of a closed iron core and windings. It is an instrument that measures current by converting a large primary current into a small secondary current based on the principle of electromagnetic induction.

[0003] Traditional current transformers are enclosed current transformers, which are inconvenient to operate and have poor safety. With the development of power automation technology, the wiring in the secondary circuits of power sector relay protection is becoming increasingly dense, and there is a growing need to detect the current signal of a specific wire in a dense network of turns. Therefore, a clamp-on current transformer has emerged. Using a clamp-on current transformer allows the tested circuit to be operated without disconnecting, making it convenient and widely applicable.

[0004] However, existing clamp-on current transformers still have the following problems: A clamp-on current transformer for improving wiring reliability disclosed in announcement number CN217239197U has the following problems: Since the mainstream clamp-on current transformer adopts a fork spring elastic structure, the clamp-on current transformer may open due to misoperation during operation, resulting in inaccurate measurement. Moreover, since the structure uses a left front shell, left rear shell, right front shell, and right rear shell to be assembled through shaft holes, the assembly cannot be stably aligned, and the transformers often have significant performance differences. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a clamp-on current transformer.

[0006] To achieve the above objectives, the technical solution of this utility model is to design a clamp-on current transformer, including a left housing and a right housing. The left housing is formed by the mating of a left front housing and a left rear housing, and the right housing is formed by the mating of a right front housing and a right rear housing. The lower parts of the left and right housings are rotatably connected by a hole-shaft fit, and the upper parts of the left and right housings are rotatably opened and closed by the hole-shaft fit. A left iron core is disposed inside the left housing, and a right iron core is disposed inside the right housing. The left and right iron cores are respectively... The device is equipped with an induction coil, characterized in that: a right groove is provided on the inner side of the right front housing and the right rear housing near the left housing, and a coaxial pivot shaft is provided in the right groove; a left groove is provided on the inner side of the left front housing and the left rear housing near the right housing; a rod is provided between the left groove and the right groove to prevent the left and right housings from opening; one end of the rod is provided with a pivot hole, and the rod is rotatably engaged with the pivot shaft in the right groove through the pivot hole; the other end of the rod has an arc-shaped rod head that movably abuts against the left groove.

[0007] A further preferred technical solution is that the right groove is located at the lower inner corner of the right front housing and the right rear housing, and the right groove is a 1 / 4 arc-shaped groove; the left groove is located at the middle inner part of the left front housing and the left rear housing, and the left groove is a semi-circular arc-shaped groove.

[0008] A further preferred technical solution is that the rod is cross-shaped.

[0009] A further preferred technical solution includes a left front positioning shaft provided on the left front housing at the hole-shaft mating part between the left and right housings, the core of the positioning shaft having a through left front core hole; and a right front positioning shaft provided on the right front housing at the hole-shaft mating part between the left and right housings, the core of the right front positioning shaft having a right front core hole; the left front housing is rotatably mated with the right front positioning shaft of the right front housing through the left front core hole.

[0010] A left rear positioning hole is provided on the left rear housing at the hole-shaft mating part between the left and right housings. A right rear positioning shaft is provided on the right rear housing at the hole-shaft mating part between the left and right housings. The core of the right rear positioning shaft is also provided with a positioning mandrel. The left rear housing is rotatably engaged with the left front positioning shaft of the left front housing through the left rear positioning hole. At the same time, the right rear positioning shaft of the right rear housing is rotatably engaged with the left front mandrel hole of the left front housing, and the right rear positioning shaft of the right rear housing abuts against the right front positioning shaft of the right front housing, so that the positioning mandrel of the right rear housing is rotatably engaged with the right front mandrel hole of the right front housing.

[0011] A further preferred technical solution includes: a pair of arc-shaped baffles are provided on the left front housing at the upper and lower positions around the left front positioning shaft; a pair of arc-shaped baffles are provided on the left rear housing at the upper and lower positions around the left rear positioning hole; wherein the arc-shaped baffle at the upper position is half of the left baffle; a right arc-shaped baffle is provided on the right rear housing at the right side of the hole-shaft mating part between the left and right housings; and a torsion spring is fitted on the left front housing at the left front positioning shaft, with the two ends of the torsion spring elastically abutting against the left and right housings respectively.

[0012] A further preferred technical solution is that the end of the torsion spring is provided with a bent edge.

[0013] A further preferred technical solution is that the left front housing has a groove around its mating edge, and the left rear housing has a protruding edge around its mating edge, the protruding edge being able to be correspondingly fastened into the groove.

[0014] A further preferred technical solution is that the right front housing has a groove around its mating edge, and the right rear housing has a protruding edge around its mating edge, the protruding edge being able to be correspondingly engaged in the groove.

[0015] The advantages and beneficial effects of this utility model are as follows: 1. The rod abuts against the lower part of the left and right shells, which can prevent the left and right shells from being accidentally opened during operation; 2. The positioning is accurate through the mutual fitting of positioning shaft holes; 3. The convex edge can be correspondingly engaged in the groove to ensure accurate docking. Attached Figure Description

[0016] Figure 1 This is a closed perspective view of the present invention;

[0017] Figure 2 This is an open perspective view of the present invention;

[0018] Figure 3 This is an exploded reverse perspective view of the present invention;

[0019] Figure 4 This is an exploded perspective view of the present invention.

[0020] Figure 5 This is a utility model Figure 4 A magnified view of a portion of the image;

[0021] In the diagram: 10. Left housing; 11. Left front housing; 111. Left front core hole; 112. Left front positioning shaft; 113. Arc-shaped retaining wall; 12. Flange; 13. Left rear housing; 131. Left rear positioning hole; 132. Left retaining wall; 14. Left iron core; 20. Right housing; 21. Right front housing; 211. Right front positioning shaft; 212. Right front core hole; 22. Concave flange; 23. Right rear housing; 231. Positioning mandrel; 232. Right rear positioning shaft; 24. Right iron core; 25. Right groove; 26. Pivot shaft; 30. Rod; 40. Torsion spring; 41. Bending edge; 50. Protruding edge; 60. Matching pin; 70. Groove; 80. Matching hole; 90. Pad. Detailed Implementation

[0022] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0023] like Figures 1 to 5As shown, an embodiment of the clamp-on current transformer of this utility model includes a left housing 10 and a right housing 20. The left housing 10 is formed by the mating of a left front housing 11 and a left rear housing 13, and the right housing 20 is formed by the mating of a right front housing 21 and a right rear housing 23. The lower parts of the left housing 10 and the right housing 20 are rotatably connected by a hole-shaft fit, and the upper parts of the left housing 10 and the right housing 20 are rotatably opened and closed by the hole-shaft fit. Semi-annular hollow cavities are respectively provided on the left housing 10 and the right housing 20. When the shells are closed, an annular hollow cavity is formed between the upper parts of the left shell 10 and the right shell 20. A left iron core 14 is disposed in the semi-annular hollow cavity of the left shell 10. After the left front shell 11 and the left rear shell 13 are joined, an iron core through hole is provided at the rotating closing part of the left shell 10 for the iron core to pass through. A right iron core 24 is disposed in the semi-annular hollow cavity of the right shell 20. After the right front shell 21 and the right rear shell 23 are joined, an iron core through hole is provided at the rotating closing part of the right shell 20 for the iron core to pass through. The left iron core 14 and the right iron core 24 are respectively wound with... An induction coil (not shown in the figure) is provided, and insulating tape (not shown in the figure) is respectively provided between the left iron core 14 and the induction coil, and between the right iron core 24 and the induction coil. A PCB wiring board is also fixed inside one of the left housing 10 and the right housing 20. The right front housing 21 and the right rear housing 23 are provided with a right groove 25 near the left housing 10. A coaxial pivot shaft 26 is provided in the right groove 25 of the right front housing 21 and the right rear housing 23. The left front housing 11 and the left rear housing 13 are provided with a right groove 25 near the right housing 20. There is a left groove 15, and a rod 30 is provided between the right groove 25 and the left groove 15 to prevent the left housing 10 and the right housing 20 from opening. One end of the rod 30 is provided with a pivot hole, and the rod 30 is rotatably engaged with the pivot shaft 26 in the right groove 25 through the pivot hole. The other end of the rod 30 has an arc-shaped rod head that movably abuts against the left groove 15. When the rod 30 abuts against the left groove 15, the rod 30 abuts against the lower part of the left housing 10 and the right housing 20, which can prevent the left housing 10 and the right housing 20 from opening accidentally during operation.

[0024] In one embodiment, the right groove 25 is located at the lower inner corner of the right front housing 21 and the right rear housing 23, and the right groove 25 is a 1 / 4 arc-shaped groove. The left groove 15 is located at the middle inner side of the left front housing 11 and the left rear housing 13, and the left groove 15 is a semi-circular arc-shaped groove. The rod 30 is cross-shaped, and the cross-shaped rod 30 can improve the strength of the rod.

[0025] A left front positioning shaft 112 is provided at the hole-shaft mating part of the left front housing 11 located between the left housing 10 and the right housing 20. The core of the left front positioning shaft 112 is provided with a through left front core hole 111. A right front positioning shaft 211 is provided at the hole-shaft mating part of the right front housing 21 located between the left housing 10 and the right housing 20. The core of the right front positioning shaft 211 is provided with a right front core hole 212. The left front housing 11 is rotatably mated with the right front positioning shaft 211 of the right front housing 21 through the left front core hole 11.

[0026] A left rear positioning hole 131 is provided on the left rear housing 13 at the hole-shaft mating part between the left housing 10 and the right housing 20. A right rear positioning shaft 232 is provided on the right rear housing 23 at the hole-shaft mating part between the left housing 10 and the right housing 20. The core of the right rear positioning shaft 232 is also provided with a positioning mandrel 231. The left rear housing 13 is rotatably engaged with the left front positioning shaft 112 of the left front housing 11 through the left rear positioning hole 131. At the same time, the right rear positioning shaft 232 of the right rear housing 23 is rotatably engaged with the left front mandrel 111 of the left front housing 11, and the right rear positioning shaft 232 of the right rear housing 23 abuts against the right front positioning shaft 211 of the right front housing 21. The rotational engagement of the positioning mandrel 231 of the right rear housing 23 with the right front mandrel 212 of the right front housing 21, through the interlocking positioning shaft hole engagement, ensures accurate positioning.

[0027] A pair of arc-shaped baffles 113 are provided on the left front housing 11 at the upper and lower positions around the left front positioning shaft 112. A pair of arc-shaped baffles 113 are provided on the left rear housing 13 at the upper and lower positions around the left rear positioning hole 131. The arc-shaped baffle located at the upper position is a half-side left baffle 132. A right arc-shaped baffle 233 is provided on the right side of the hole-shaft mating part between the left housing 10 and the right housing 20 on the right rear housing 23. A torsion spring 40 is fitted on the left front housing 11 at the left front positioning shaft 112 to achieve elastic closing between the left housing 10 and the right housing 20. The two ends of the torsion spring 40 elastically abut against the left housing 10 and the right housing 20, respectively.

[0028] The end of the torsion spring 40 is designed with a bend, and a bend edge 41 is provided to ensure internal balance.

[0029] The left front housing 11 is provided with a plurality of mating holes 80, and the left rear housing 13 is provided with a plurality of mating pins 60. When the left front housing 11 and the left rear housing 13 are mated and connected, the mating holes 80 are correspondingly adapted to the mating pins 60. Moreover, the left front housing 11 is provided with a groove 70 around the mating edge, and the left rear housing 13 is provided with a protrusion 50 around the mating edge. The protrusion 50 can be correspondingly fastened in the groove 70 to ensure accurate mating.

[0030] The right front housing 21 is provided with a plurality of mating holes 80, and the right rear housing 23 is provided with a plurality of mating pins 60. When the right front housing 21 and the right rear housing 23 are mated and connected, the mating holes 80 are correspondingly adapted to the mating pins 60. Moreover, the right front housing 21 is provided with a groove 70 around the mating edge, and the right rear housing 23 is provided with a protrusion 50 around the mating edge. The protrusion 50 can be correspondingly fastened in the groove 70 to ensure accurate mating.

[0031] To improve the reliability of mating and thus enhance the current detection accuracy and reliability of the clamp-on current transformer, flanges 12 are provided on the outer periphery of the core through hole on the left front housing 11 and the left rear housing 13, and concave flanges 22 are provided on the outer periphery of the core through hole on the right front housing 21 and the right rear housing 23. When the left housing 10 and the right housing 20 are mated and connected, the flanges 12 are correspondingly adapted to the concave flanges 22; the mating parts between the left housing 10 and the right housing 20 cooperate with each other.

[0032] The flange 12 and the concave flange 22 are arranged in a quadrilateral shape, preferably, the flange 12 and the concave flange 22 are arranged in a square shape.

[0033] Pads 90 are respectively provided on the left front housing 11 and the left rear housing 13 near the core through hole to cooperate with the left core 14 for supporting the left core 14. Pads 90 are also respectively provided on the right front housing 21 and the right rear housing 23 near the core through hole to cooperate with the right core 24 for supporting the right core 24.

[0034] The lower outer surfaces of the left housing 10 and the right housing 20 are provided with a number of parallel, spaced strip-shaped protrusions. These strip-shaped protrusions are located on the gripping part of the clamp-type current transformer and can play a good anti-slip role, thereby facilitating the gripping operation of the clamp-type current transformer.

[0035] In this embodiment, the lead wire of the induction coil is connected to the PCB terminal block, and the external data line passes through the wiring hole on the left housing 10 or the right housing 20 and is connected to the PCB terminal block.

[0036] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A clamp-on current transformer, comprising a left housing and a right housing, wherein the left housing is formed by the mating of a left front housing and a left rear housing, and the right housing is formed by the mating of a right front housing and a right rear housing; the lower parts of the left and right housings are rotatably connected via a hole-shaft connection, and the upper parts of the left and right housings are rotatably opened and closed via the hole-shaft connection; a left iron core is disposed inside the left housing, and a right iron core is disposed inside the right housing; induction coils are wound on the left and right iron cores respectively, characterized in that: The right front housing and the right rear housing have a right groove on the inner side near the left housing. A coaxial pivot shaft is provided in the right groove. The left front housing and the left rear housing have a left groove on the inner side near the right housing. A rod is provided between the left groove and the right groove to prevent the left and right housings from opening. One end of the rod has a pivot hole. The rod is rotatably engaged with the pivot shaft in the right groove through the pivot hole. The other end of the rod has an arc-shaped rod head that movably abuts against the left groove.

2. A clamp-on current transformer according to claim 1, characterized in that: The right groove is located at the lower inner corner of the right front housing and the right rear housing, and the right groove is a 1 / 4 arc-shaped groove. The left groove is located at the middle inner part of the left front housing and the left rear housing, and the left groove is a semi-circular arc-shaped groove.

3. A clamp-on current transformer according to claim 1, characterized in that: The rod is cross-shaped.

4. A clamp-on current transformer according to claim 1, characterized in that: A left front positioning shaft is provided on the left front housing at the hole-shaft mating part between the left and right housings. The core of the positioning shaft has a through left front core hole. A right front positioning shaft is provided on the right front housing at the hole-shaft mating part between the left and right housings. The core of the right front positioning shaft has a right front core hole. The left front housing rotates with the right front positioning shaft of the right front housing through the left front core hole. A left rear positioning hole is provided on the left rear housing at the hole-shaft mating part between the left and right housings. A right rear positioning shaft is provided on the right rear housing at the hole-shaft mating part between the left and right housings. The core of the right rear positioning shaft is also provided with a positioning mandrel. The left rear housing is rotatably engaged with the left front positioning shaft of the left front housing through the left rear positioning hole. At the same time, the right rear positioning shaft of the right rear housing is rotatably engaged with the left front mandrel hole of the left front housing, and the right rear positioning shaft of the right rear housing abuts against the right front positioning shaft of the right front housing, so that the positioning mandrel of the right rear housing is rotatably engaged with the right front mandrel hole of the right front housing.

5. A clamp-on current transformer according to claim 4, characterized in that: A pair of arc-shaped baffles are provided on the left front housing at the upper and lower positions around the left front positioning shaft. A pair of arc-shaped baffles are provided on the left rear housing at the upper and lower positions around the left rear positioning hole. The arc-shaped baffle located at the upper position is half of the left baffle. A right arc-shaped baffle is provided on the right rear housing at the outer right position of the hole-shaft mating part between the left and right housings. A torsion spring is mounted on the left front housing at the left front positioning shaft. The two ends of the torsion spring elastically abut against the left and right housings respectively.

6. A clamp-on current transformer according to claim 5, characterized in that: The end of the torsion spring is provided with a bent edge.

7. A clamp-on current transformer according to any one of claims 1-6, characterized in that: The left front housing has a groove around its mating edge, and the left rear housing has a protrusion around its mating edge, the protrusion being able to be fastened into the groove.

8. A clamp-on current transformer according to any one of claims 1-6, characterized in that: The right front housing has a groove around its mating edge, and the right rear housing has a protrusion around its mating edge, the protrusion being able to be fastened into the groove.

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