Current mutual inductance device

Abstract

The utility model discloses a current mutual inductance device, and belongs to a current mutual inductance device based on a GIS technology. The shielding device comprises a shell, a shielding cylinder, a shielding cover and a fixing structure, the shell is provided with two open ends and a hollow interior, the shielding cylinder is fixed in the shell, the shielding cylinder comprises a cylinder body and a first flange located at one end of the cylinder body, the first flange protrudes relative to the outer wall of the cylinder body, and the first flange is fixed on the outer wall of the cylinder body. One end of the shielding cover is provided with a second flange, the first flange and the second flange are connected through the fixing structure, and the shielding cover does not protrude out of the cylindrical surface where the inner wall of the cylinder is located. According to the utility model, the connection area of the shielding cover and the shielding cylinder has higher strength, and the current mutual inductance device has better electrical performance and better safety performance.

Description

Technical Field

[0001] The utility model relates to a current mutual induction technology applied in GIS products, in particular to a current mutual induction device. Background Art

[0002] Current transformers are essential components in GIS (Gas Insulated Combined Electrical Equipment). Typically, a GIS current transformer consists of a shielding tube, a shielding case, a primary conductor, and a current coil. The shielding tube is connected to the shielding case, which is tilted outward relative to the shielding tube. The primary conductor passes through the axis of the shielding tube and the shielding case, and the current coil is sheathed on the outer wall of the shielding tube.

[0003] In the existing technology, the shielding tube and the shielding cover are made of aluminum alloy. The shielding cover is riveted to one end of the shielding tube. In order to prevent the rivet from protruding from the inner wall of the shielding tube, the thickness of the end of the shielding tube needs to be reduced. One end of the shielding cover is attached to the inner wall of the end of the shielding tube, and rivets are drawn along the radial direction of the shielding tube. After riveting, the strength of the aluminum wall is poor and it is easy to be damaged during transportation. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that a shielding tube and a shielding cover are easily damaged during transportation due to poor strength at the connection position. To this end, the utility model proposes a current mutual induction device.

[0005] The technical solution of the utility model is as follows:

[0006] A current mutual inductance device includes an outer shell, a shielding cylinder, a shielding cover, and a fixing structure. The outer shell is configured to be open at both ends and hollow inside. The shielding cylinder is fixed inside the outer shell. The shielding cylinder includes a cylinder body and a first flange located at one end of the cylinder body. The first flange protrudes relative to the outer wall of the cylinder body. One end of the shielding cover has a second flange. The first flange and the second flange are connected by the fixing structure, and the shielding cover does not protrude from the cylindrical surface where the inner wall of the cylinder is located.

[0007] As an optional solution, the first flange is provided with a plurality of first positioning holes, the second flange is provided with second positioning holes corresponding one-to-one to the first positioning holes, and each of the fixing structures corresponds to a group of the first positioning holes and the second positioning holes.

[0008] As an optional solution, the fixing structure uses rivets.

[0009] As an optional solution, the fixing structure includes a fixing bolt and a fixing nut, and the fixing bolt passes through the first positioning hole and the second positioning hole and is threadedly connected to the fixing nut.

[0010] As an optional solution, the fixing structure also includes a flat washer sleeved on the fixing bolt, and the flat washer is pressed onto the first flange or the second flange through the fixing nut; a thread locking layer is provided between the fixing bolt and the fixing nut.

[0011] As an optional solution, the fixing structure includes a countersunk screw, the first positioning hole is a threaded hole, the countersunk screw is threadedly connected to the first positioning hole, and a thread locking layer is provided between the countersunk screw and the first positioning hole.

[0012] As an optional solution, the second positioning hole is a countersunk hole, and one end of the fixing structure is sunk into the second positioning hole.

[0013] As an optional solution, the shielding tube and the shielding cover are made of aluminum alloy, and the fixing structure is made of stainless steel.

[0014] As an optional solution, the shielding tube also includes a connecting portion, which is provided at the other end of the cylinder, and the connecting portion extends from the outer wall of the cylinder to the outside of the cylinder, and the connecting portion is detachably connected to the outer shell; a boss is provided in the outer shell, and the connecting portion is fixed on the boss; the shielding tube and the shielding cover are all located inside the outer shell.

[0015] As an optional solution, the current mutual inductance device also includes a conductor, a coil and a pot-type insulator, the pot-type insulator is fixed to one end of the shell, the conductor is fixedly connected to the pot-type insulator, the conductor passes through the shielding tube and the shielding cover, and is coaxial with the shielding tube, and a plurality of the coils are sleeved from one end of the shielding tube to the other end.

[0016] The utility model has at least the following beneficial effects:

[0017] 1. The connection structure between the shielding cover and the shielding tube of this embodiment is located on the outside of the shielding tube. It is not necessary to reduce the thickness of the end of the shielding tube to prevent the fixing structure from protruding from the inner wall of the tube. During processing, the end of the shielding tube can be bent outward to form a first flange. Therefore, the thickness of the first flange can be completely the same as the thickness of the tube, so that the rivet position can obtain higher structural strength.

[0018] 2. The electric field strength outside the shielding tube of this embodiment is lower than that inside, that is, the connection position between the shielding cover and the shielding tube is located in the low electric field strength area, thus reducing the risk of discharge.

[0019] 3. The riveting direction of this embodiment is parallel to the axis of the cylinder. Compared with riveting along the radial direction of the cylinder, the debris generated by riveting will not affect the field strength inside the shielding cylinder, and it is more convenient to process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical features and advantages of the present invention will be more fully understood by referring to the following detailed description in conjunction with the accompanying drawings.

[0021] Figure 1 It is a cross-sectional view of the current mutual induction device of the first embodiment of the present utility model.

[0022] Figure 2 yes Figure 1 The enlarged view of part A is used to show the connection structure between the shielding cover and the shielding tube.

[0023] Reference numerals:

[0024] 1. Shell; 11. Boss; 2. Shielding tube; 21. Cylinder body; 22. First flange; 23. Connecting portion; 24. First positioning hole; 3. Shielding cover; 31. Cover body; 311. Straight section; 312. Arc section; 32. Second flange; 33. Second positioning hole; 4. Fixing structure; 5. Conductor; 6. Coil; 7. Basin insulator. DETAILED DESCRIPTION

[0025] Unless otherwise defined, the technical or scientific terms used in this specification and claims should have the common meanings understood by persons having ordinary skills in the technical field to which the present invention belongs.

[0026] Example 1

[0027] refer to Figure 1 and Figure 2 This embodiment provides a current transformer device for use in GIS products. The current transformer device includes a housing 1, a shielding tube 2, a shielding cover 3, a fixing structure 4, a conductor 5, a coil 6, and a pot-type insulator 7.

[0028] The housing 1 is open at both ends and hollow within its interior. In this embodiment, the shielding tube 2 and shielding cover 3 are completely located within the hollow space formed by the housing 1. In other embodiments, the shielding tube 2 partially extends beyond the housing 1, with the shielding cover 3 positioned outside the housing 1. A boss 11 is provided within the housing 1. One end of the housing 1 is flanged outward to form a flange for mounting the pot-type insulator 7. The two are detachably connected via fasteners. The housing 1 can be manufactured using an integrated molding process.

[0029] The shielding cylinder 2 comprises a body 21, a first flange 22, and a connecting portion 23. The body 21 is a circular, straight tubular structure. The first flange 22 is positioned at one end of the body 21, protruding radially outward from the outer wall of the body 21. This prevents the flange 22 from affecting the electric field within the body 21. Multiple first positioning holes 24 are provided on the first flange 22, each evenly spaced. The connecting portion 23 is removably connected to the boss 11 within the housing 1 via fasteners. The connecting portion 23 also protrudes radially outward from the outer wall of the body 21. The connecting portion 23 can be a block-shaped structure or a ring-shaped structure. It should be noted that, given that the shielding cylinder 2 and the housing 1 are not coaxial, the connecting portion 23 can be an irregular ring-shaped structure, with varying thicknesses (the distance between the inner and outer rings) at different locations, allowing for direct connection to the housing 1. The thicker areas can also serve as mounting bases for other components. The shielding cylinder 2 can be manufactured using an integrated molding process. The shielding cylinder 2 is made of aluminum alloy.

[0030] The shielding cover 3 comprises a housing 31 and a second flange 32. The housing 31 is a hollow structure comprising a straight section 311 and an arcuate section 312. The arcuate section 312 curves outward relative to the straight section 311, forming a groove opening toward one side of the shielding tube 2, thereby providing a shielding function. The second flange 32 is located at one end of the straight section 311 and extends radially outward relative to the outer surface of the straight section 311. The second flange 32 is provided with a second positioning hole 33, which corresponds to the first positioning hole 24. The fixing structure 4 secures the shielding cover 3 to the shielding tube 2 at the first positioning hole 24 and the second positioning hole 33. The second positioning hole 33 is a countersunk hole, and the end of the fixing structure 4 is sunk into the second positioning hole 33. The shielding cover 3 can be formed using an integrated molding process, i.e., the second flange 32 and the housing 31 are integral. The shielding cover 3 is made of aluminum alloy.

[0031] In this embodiment, the fixing structure 4 is a rivet structure made of stainless steel, which passes through the first positioning hole 24 and the second positioning hole 33 and fixes the first flange 22 and the second flange 32 . Compared to the scheme of fixing the shield cover 3 and the shielding tube 2 by riveting along the radial direction of the shielding tube 2, first, the connection structure of the shield cover 3 and the shielding tube 2 in this embodiment is located outside the shielding tube 2. There is no need to reduce the thickness of the end of the shielding tube 2 to prevent the fixing structure 4 from protruding from the inner wall of the cylinder 21. During processing, the end of the shielding tube 2 is bent outward to form the first flange 22. Therefore, the thickness of the first flange 22 can be completely the same as the thickness of the cylinder 21, thereby achieving higher structural strength at the riveting position; second, the electric field strength outside the shielding tube 2 of this embodiment is in a low electric field strength area relative to the interior, that is, the connection position of the shield cover 3 and the shielding tube 2 is located in a low electric field strength area, thereby reducing the risk of discharge; third, the riveting direction of this embodiment is in a direction parallel to the axis of the cylinder 21. Compared with riveting along the radial direction of the cylinder 21, the debris generated by the riveting does not affect the electric field strength inside the shielding tube 2, thereby improving the safety of the product and making it easier to process. In other words, in this embodiment, the connection area between the shield cover 3 and the shielding tube 2 has higher strength, and the current mutual induction device has better electrical performance and better safety performance.

[0032] The coil 6 is sleeved and fixedly connected to the shielding cylinder 2. Multiple coils 6 are arranged sequentially from one end of the cylinder 21 to the other end, with adjacent coils 6 closely spaced. The conductor 5 is coaxially arranged with the cylinder 21 of the shielding cylinder 2. One end of the conductor 5 is fixed to the pot insulator 7, and the other end extends out of the shielding cylinder 2.

[0033] Example 2

[0034] The difference between this embodiment and the first embodiment lies in the fixing structure 4. In this embodiment, the fixing structure 4 comprises a fixing bolt, a fixing nut, and a flat washer. The fixing bolt passes through the first positioning hole 24 and the second positioning hole 33. The head of the fixing bolt is sunk into the second positioning hole 33, and the tail of the fixing bolt extends out of the first positioning hole 24 and connects with the fixing nut. A thread-locking layer is provided between the fixing bolt and the fixing nut to enhance the locking effect. The thread-locking layer can be formed by applying a thread-locking agent to the threads of the fixing bolt or the fixing nut during assembly. The flat washer is mounted on the tail of the fixing bolt and is pressed against the first positioning hole 24 by the fixing nut. The rest of this embodiment is the same as in the first embodiment and will not be repeated here.

[0035] Compared with the first embodiment, this embodiment uses fixing bolts, fixing nuts and flat washers to connect the shielding cover 3 and the shielding cylinder 2, which will not generate any debris and further improve the safety of the product.

[0036] Example 3

[0037] This embodiment differs from the first embodiment in that: in this embodiment, the fixing structure 4 utilizes a countersunk screw, and the first positioning hole 24 utilizes a threaded hole. The countersunk screw passes through the second positioning hole 33 and is threadedly connected to the first positioning hole 24. A thread-locking layer is formed between the countersunk screw and the first positioning hole 24 by applying a thread-locking agent. The remaining parts of this embodiment are the same as those of the first embodiment and are not further described.

[0038] Compared with the first embodiment, this embodiment uses countersunk screws to fix the shielding cover 3 and the shielding cylinder 2, which will not generate any debris and further improve the safety of the product.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A current mutual induction device, characterized in that: It includes an outer shell, a shielding cylinder, a shielding cover and a fixing structure. The outer shell is set to be open at both ends and hollow inside. The shielding cylinder is fixed inside the outer shell. The shielding cylinder includes a cylinder body and a first flange located at one end of the cylinder body. The first flange protrudes relative to the outer wall of the cylinder body. One end of the shielding cover has a second flange. The first flange and the second flange are connected by the fixing structure, and the shielding cover does not protrude from the cylindrical surface where the inner wall of the cylinder is located.

2. The current mutual induction device according to claim 1, characterized in that: The first flange is provided with a plurality of first positioning holes, the second flange is provided with second positioning holes corresponding to the first positioning holes one by one, and each of the fixing structures corresponds to a group of the first positioning holes and the second positioning holes.

3. The current mutual induction device according to claim 2, characterized in that: The fixing structure adopts rivets.

4. The current mutual induction device according to claim 2, characterized in that: The fixing structure includes a fixing bolt and a fixing nut. The fixing bolt passes through the first positioning hole and the second positioning hole and is threadedly connected to the fixing nut.

5. The current mutual induction device according to claim 4, characterized in that: The fixing structure further includes a flat washer sleeved on the fixing bolt, and the flat washer is pressed onto the first flange or the second flange through the fixing nut; a thread locking layer is provided between the fixing bolt and the fixing nut.

6. The current mutual induction device according to claim 2, characterized in that: The fixing structure includes a countersunk screw, the first positioning hole is a threaded hole, the countersunk screw is threadedly connected to the first positioning hole, and a thread locking layer is provided between the countersunk screw and the first positioning hole.

7. The current mutual induction device according to any one of claims 4 to 6, characterized in that: The second positioning hole is a countersunk hole, and one end of the fixing structure is sunk into the second positioning hole.

8. The current mutual induction device according to any one of claims 1 to 6, characterized in that: The shielding tube and the shielding cover are made of aluminum alloy, and the fixing structure is made of stainless steel.

9. The current mutual induction device according to any one of claims 1 to 6, characterized in that: The shielding cylinder also includes a connecting portion, which is provided at the other end of the cylinder body and extends from the outer wall of the cylinder body to the outside of the cylinder body, and the connecting portion is detachably connected to the outer shell; a boss is provided in the outer shell, and the connecting portion is fixed on the boss; the shielding cylinder and the shielding cover are all located inside the outer shell.

10. The current mutual induction device according to any one of claims 1 to 6, characterized in that: The current mutual inductance device also includes a conductor, a coil and a pot-type insulator. The pot-type insulator is fixed to one end of the shell. The conductor is fixedly connected to the pot-type insulator. The conductor passes through the shielding tube and the shielding cover and is coaxial with the shielding tube. Several coils are sleeved from one end to the other end of the shielding tube.

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