Insulation shielding device for external current transformer of circuit breaker

Abstract

The utility model relates to the technical field of shielding devices, in particular to an insulation shielding device for an external current transformer of a circuit breaker. According to the technical scheme, a fixing assembly comprises an outer inserting cylinder, an inner rotating shaft, a positioning rod, a ball and an oval block, the inner wall of the outer inserting cylinder is rotationally connected with the inner rotating shaft, the end of the positioning rod is fixedly connected with the ball, the oval block is fixedly installed at the end of the inner rotating shaft, and the ball slides along the cambered surface of the oval block. During installation, the inner rotating shaft is rotated to enable the ball to be located on the long shaft of the oval block, the positioning rod extends out of the outer inserting cylinder and is clamped in the limiting groove, and then the mutual inductor body can be fixed to the installation bottom plate; during disassembly, the inner rotating shaft is rotated to enable the ball to be located on the short shaft of the oval block, at the moment, the outer inserting cylinder can be pulled out of the inserting hole, and the mutual inductor body in the inserting hole is taken out. And screw fixation is replaced, and the problem that screws slip and cannot be quickly disassembled due to rusting is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of shielding devices, in particular to an insulation shielding device for an external current transformer of a circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can close, carry and disconnect current under abnormal circuit conditions within a specified time. In the power system, current transformers and circuit breakers are inseparable. Current transformers can measure the current in the circuit and convert high current into low current for use by measuring instruments. As one of the protection devices of the power system, current transformers and circuit breakers are interrelated. When the current in the circuit is overloaded or short-circuited, the circuit is cut off to protect equipment and personal safety.

[0003] In the prior art, the current transformer is connected to the circuit breaker. There are built-in and external current transformers. The external current transformer is installed outside the electrical equipment. A hole is drilled on the copper busbar and the current transformer is fixed on it with screws. The insulating shielding shell is then fixed to the current transformer with screws.

[0004] However, in this fixing method, the external current transformer is installed in a shielded shell, and the screws thereon are exposed to the air. The moisture in the air corrodes the screws, causing the screws to strip, making it difficult to disassemble and repair. Utility Model Content

[0005] The utility model aims to solve the problem of screw fixing being exposed to air and being corroded and causing thread slippage in the background technology, and proposes an insulation shielding device for an external current transformer of a circuit breaker.

[0006] The technical solution of the utility model is: an insulation shielding device for an external current transformer of a circuit breaker, comprising:

[0007] A mounting base plate, a shielding box is arranged on the top of the mounting base plate, a transformer body is placed inside the shielding box, and the transformer body is electrically connected to a circuit breaker;

[0008] The fixing assembly includes an outer insert cylinder, an inner rotating shaft, a positioning rod, a sphere and an elliptical block. The inner wall of the outer insert cylinder is rotatably connected to the inner rotating shaft, the end of the positioning rod is fixedly connected to the sphere, the end of the inner rotating shaft is fixedly mounted with an elliptical block, and the sphere slides along the arc surface of the elliptical block.

[0009] The installation base plate and the shielding box are both provided with plug holes, the external plug-in tube passes through the shielding box, a limiting groove is provided at the bottom of the installation base plate, and the positioning rod is clamped with the limiting groove.

[0010] Optionally, an elliptical plate is fixedly mounted on the end of the inner rotating shaft, the elliptical block and the elliptical plate form an elliptical groove, the ball slides in the elliptical groove, and two balls are provided and distributed at equal angles in a ring at the end of the inner rotating shaft.

[0011] Optionally, the elliptical plate is provided with an annular notch, the positioning rod extends from the notch to the inside of the elliptical plate and is connected to the sphere, and the outer wall of the positioning rod is slidably connected to the outer insert cylinder.

[0012] Optionally, a rubber ring is fixedly mounted on the inner wall of the outer insert tube, and the inner rotating shaft is interference fit with the rubber ring.

[0013] Optionally, the shielding box includes a shielding outer box and a shielding inner box, the inner wall of the shielding outer box is slidably connected to the shielding inner box, and the shielding outer box and the shielding inner box form a closed box body.

[0014] Optionally, a first gasket is fixedly mounted on the bottom of the outer shielding box, a second gasket is fixedly mounted on the bottom of the inner shielding box, and the outer insert passes through the first gasket, the second gasket and the mounting base plate.

[0015] Optionally, the internal shape of the closed box body is the same as the shape of the transformer body, and the first gasket, the second gasket and the mounting base plate are stacked in sequence from top to bottom.

[0016] Compared with the prior art, the utility model has the following beneficial technical effects:

[0017] When installing, the utility model can fix the transformer body on the installation base plate by rotating the inner rotating shaft so that the ball is located on the long axis of the elliptical block, and the positioning rod extends from the outer plug-in tube and is stuck in the limit groove; when disassembling, the inner rotating shaft is rotated so that the ball is located on the short axis of the elliptical block, and the outer plug-in tube can be pulled out of the insertion hole to take out the transformer body. It replaces screw fixing and avoids the problem that the screws are stripped and cannot be quickly disassembled due to rust.

[0018] Furthermore, there is a gap between the outer insert and the mounting base plate and the jack on the shielding box. When vibration occurs, the outer insert rotates in the jack to offset the vibration force, avoiding relative rotation between the inner shaft and the outer insert, resulting in no more jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall structure of an embodiment of the utility model is given;

[0020] Figure 2 A schematic diagram of a shielding outer box structure separation state of an embodiment of the utility model is given;

[0021] Figure 3A half-section schematic diagram of a shielding outer box structure of an embodiment of the utility model is given;

[0022] Figure 4 Given Figure 3 A part of the positioning rod structure enlarged schematic diagram;

[0023] Figure 5 A schematic cross-sectional view of the outer insert tube structure of an embodiment of the utility model is given;

[0024] Figure numerals: 1. Mounting base plate; 2. Shielding box; 21. Shielding outer box; 22. First gasket; 23. Shielding inner box; 24. Second gasket; 3. Transformer body; 4. Fixing assembly; 41. External plug-in cylinder; 42. Internal rotating shaft; 43. Rubber ring; 44. Positioning rod; 45. Round ball; 46. Elliptical block; 47. Elliptical plate; 5. Limiting groove. DETAILED DESCRIPTION

[0025] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0026] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0027] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Example 1

[0031] This embodiment provides an insulation shielding device for an external current transformer of a circuit breaker, such as Figure 1 and 2 As shown, it comprises a mounting base plate 1, a shielding box 2 is arranged on the top of the mounting base plate 1, and a transformer body 3 is placed inside the shielding box 2. The transformer body 3 is electrically connected to a circuit breaker.

[0032] like Figure 2 As shown, the shielding box 2 includes a shielding outer box 21 and a shielding inner box 23. The inner wall of the shielding outer box 21 is slidably connected to the shielding inner box 23. The shielding outer box 21 and the shielding inner box 23 form a closed box body. The internal shape of the closed box body is the same as the shape of the transformer body 3. The transformer body 3 is protected by the closed box body, and the transformer body 3 is isolated inside the closed box body, which has the effect of insulation shielding and prevents the transformer body 3 from being affected by the external environment.

[0033] A first gasket 22 is fixedly installed at the bottom of the shielding outer box 21, and a second gasket 24 is fixedly installed at the bottom of the shielding inner box 23. The internal shape of the closed box body is the same as the shape of the transformer body 3. The first gasket 22, the second gasket 24 and the mounting base plate 1 are stacked in sequence from top to bottom.

[0034] like Figure 3-5 As shown, a fixing assembly 4 is arranged inside the mounting base plate 1, and the fixing assembly 4 comprises an outer insert 41, an inner shaft 42, a positioning rod 44 and a ball 45. The outer insert 41 passes through the first gasket 22, the second gasket 24 and the mounting base plate 1, and the inner wall of the outer insert 41 is rotatably connected with the inner shaft 42, and an elliptical plate 47 is fixedly installed at the end of the inner shaft 42, and the end of the positioning rod 44 is fixedly connected with the ball 45. Two balls 45 are arranged and are distributed at the end of the inner shaft 42 in an annular manner with equal angles.

[0035] like Figure 4As shown, both the mounting base plate 1 and the shielding box 2 are provided with jacks, the outer plug-in tube 41 penetrates the shielding box 2, the bottom of the mounting base plate 1 is provided with a limiting groove 5, the positioning rod 44 is engaged with the limiting groove 5, and the outer plug-in tube 41 is fixed by engaging the positioning rod 44 with the limiting groove 5. The first gasket 22, the second gasket 24 and the mounting base plate 1 are stacked in sequence from top to bottom, and the mounting base plate 1, the shielding outer box 21 and the shielding inner box 23 are clamped by the outer plug-in tube 41 and the positioning rod 44, so that the shielding outer box 21 and the shielding inner box 23 are fixed on the mounting base plate 1, so that the mutual inductor body 3 in the shielding outer box 21 and the shielding inner box 23 is fixed on the mounting base plate 1.

[0036] like Figure 1 As shown, an elliptical block 46 is fixedly mounted on the end of the inner rotating shaft 42, and the ball 45 slides along the arc surface of the elliptical block 46. The elliptical block 46 and the elliptical plate 47 form an elliptical groove, and the ball 45 slides in the elliptical groove. An annular notch is provided on the elliptical plate 47, and the positioning rod 44 extends from the notch to the inside of the elliptical plate 47 and is connected to the ball 45. The outer wall of the positioning rod 44 is slidably connected to the outer insert 41.

[0037] When the ball 45 is located on the long axis of the elliptical block 46, the distance between the two inner rotating shafts 42 is the longest. At this time, the positioning rod 44 extends from the outer insert tube 41 and is stuck in the limit groove 5; when the ball 45 is located on the short axis of the elliptical block 46, the positioning rod 44 is completely retracted into the outer insert tube 41.

[0038] like Figure 5 As shown, a rubber ring 43 is fixedly mounted on the inner wall of the outer insert 41, and the inner shaft 42 is interference-fitted with the rubber ring 43. The resistance between the inner shaft 42 and the rubber ring 43 is increased to prevent the inner shaft 42 and the mounting base 1 from rotating relative to each other; there is a gap between the outer insert 41 and the mounting base 1 and the jack on the shielding box 2. When vibration occurs, the outer insert 41 rotates in the jack to offset the vibration force, preventing the inner shaft 42 and the outer insert 41 from rotating relative to each other.

[0039] In this embodiment, during installation, the inner rotating shaft 42 is rotated so that the long axis of the elliptical block 46 is on the main axis, and the positioning rod 44 extends from the outer insert 41 and is stuck in the limiting groove 5, so that the shielding outer box 21, the shielding inner box 23 and the transformer body 3 can be fixed on the installation base plate 1;

[0040] During disassembly, the inner rotating shaft 42 is rotated to make the ball 45 located on the short axis of the elliptical block 46. Then, the outer plug-in tube 41 can be pulled out from the insertion hole, and the shielding outer box 21 and the shielding inner box 23 can be separated, and the mutual inductor body 3 therein can be taken out.

[0041] The above-mentioned specific embodiments are only several optional embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. An insulation shielding device for an external current transformer of a circuit breaker, characterized in that: include: A mounting base plate (1), a shielding box (2) being arranged on the top of the mounting base plate (1), a transformer body (3) being placed inside the shielding box (2), and the transformer body (3) being electrically connected to a circuit breaker; The fixing assembly (4) comprises an outer insert cylinder (41), an inner rotating shaft (42), a positioning rod (44), a sphere (45) and an elliptical block (46); the inner wall of the outer insert cylinder (41) is rotatably connected to the inner rotating shaft (42); the end of the positioning rod (44) is fixedly connected to the sphere (45); the end of the inner rotating shaft (42) is fixedly mounted with the elliptical block (46); and the sphere (45) slides along the arc surface of the elliptical block (46); The installation base plate (1) and the shielding box (2) are both provided with plug holes, the external plug tube (41) passes through the shielding box (2), a limiting groove (5) is provided at the bottom of the installation base plate (1), and the positioning rod (44) is clamped with the limiting groove (5).

2. The insulation shielding device for an external current transformer of a circuit breaker according to claim 1, characterized in that: An elliptical plate (47) is fixedly mounted on the end of the inner rotating shaft (42), and the elliptical block (46) and the elliptical plate (47) form an elliptical slide groove, in which the round ball (45) slides. Two round balls (45) are provided and are distributed at equal angles in a ring at the end of the inner rotating shaft (42).

3. The insulation shielding device for an external current transformer of a circuit breaker according to claim 2, characterized in that: The elliptical plate (47) is provided with an annular notch, the positioning rod (44) extends from the notch to the inside of the elliptical plate (47) and is connected to the sphere (45), and the outer wall of the positioning rod (44) is slidably connected to the outer insert cylinder (41).

4. The insulation shielding device for an external current transformer of a circuit breaker according to claim 1, characterized in that: A rubber ring (43) is fixedly mounted on the inner wall of the outer insert cylinder (41), and the inner rotating shaft (42) and the rubber ring (43) are interference fit.

5. The insulation shielding device for an external current transformer of a circuit breaker according to claim 1, characterized in that: The shielding box (2) comprises a shielding outer box (21) and a shielding inner box (23); the inner wall of the shielding outer box (21) is slidably connected to the shielding inner box (23); the shielding outer box (21) and the shielding inner box (23) form a closed box body.

6. The insulation shielding device for an external current transformer of a circuit breaker according to claim 5, characterized in that: A first gasket (22) is fixedly mounted on the bottom of the shielding outer box (21), a second gasket (24) is fixedly mounted on the bottom of the shielding inner box (23), and the outer insert (41) passes through the first gasket (22), the second gasket (24) and the mounting base plate (1).

7. The insulation shielding device for an external current transformer of a circuit breaker according to claim 6, characterized in that: The internal shape of the closed box body is the same as the shape of the transformer body (3), and the first gasket (22), the second gasket (24) and the mounting base plate (1) are stacked in sequence from top to bottom.

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