A shielding structure of a current transformer

Abstract

The utility model discloses a shielding structure of current transformer relates to current transformer technical field, and its technical key points include current transformer shielding casing, current transformer positioning machine body, current transformer shielding cover plate, current transformer shielding casing's inside intermediate is installed to current transformer positioning machine body sleeve connection, current transformer shielding cover plate installs and is connected in current transformer shielding casing's front end inboard, and is located the front of current transformer positioning machine body, and technical effect is that current transformer shielding cover plate can effectively close current transformer shielding casing's front end opening, and is located the front of current transformer positioning machine body, thereby can form shielding package area and shield, current transformer shielding cover plate and current transformer shielding casing all adopt the permalloy and are made, thereby can effectively utilize the magnetic circuit shunt principle and limit external magnetic field in the shielding body, reduce the interference to mutual inductor.

Description

Technical Field

[0001] This utility model relates to the field of current transformer technology, specifically a shielding structure for a current transformer. Background Technology

[0002] A current transformer is an instrument that converts a large primary current into a small secondary current based on the principle of electromagnetic induction. A current transformer consists of a closed iron core and windings. Its primary winding has very few turns and is connected in series in the circuit where the current to be measured is located.

[0003] The existing Chinese patent CN209641502U, disclosed on November 15, 2019, discloses a shielding structure for a current transformer. The shielding shell body includes a first splicing body and a second splicing body. Both the first and second splicing bodies include a cover plate and a shell. The inner side of the cover plate is provided with a locking element, and the upper end of the shell is provided with a locking hole. The locking element includes a locking bar and a locking body. The locking body includes a top plate and a locking spring. The bottom surface and two sides of the shell of the first and second splicing bodies are respectively provided with support members. One end of the support member extends to form a pin, and the other end is recessed to form a socket that matches the pin.

[0004] However, in actual use, the above-mentioned device only places the current transformer inside the shielding shell for shielding, without improving the current transformer itself, which makes the overall size large and inconvenient to place and use.

[0005] Therefore, we propose a novel shielding structure for current transformers to solve the above-mentioned technical problems. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this utility model provides a shielding structure for a current transformer, which solves the problem that in actual use, the aforementioned devices simply place the current transformer inside the shielding shell for shielding without improving the current transformer itself, resulting in a large overall size and inconvenience during placement and use.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a shielding structure for a current transformer, comprising:

[0010] Current transformer shielding housing;

[0011] A current transformer positioning body is sleeved and installed inside the shielding shell of the current transformer in the middle.

[0012] A current transformer shielding cover is installed and connected to the inner front end of the current transformer shielding housing and is located in front of the current transformer positioning body.

[0013] The current transformer mounting base is installed and connected to the lower end of the current transformer shielding housing.

[0014] The current transformer positioning body includes a resin housing. An upper positioning protrusion is fixedly connected to the middle of the upper end of the resin housing. A magnetic core is installed inside the upper end of the resin housing. A coil is wound around the periphery of the magnetic core. Terminal rods are fixedly connected to both ends of the coil through the resin housing. Lower positioning protrusions are symmetrically fixed to both sides of the lower end of the resin housing. The resin housing is installed on the inner shielding housing through the upper and lower positioning protrusions.

[0015] Preferably, the current transformer shielding housing includes an outer shielding housing, an inner shielding housing is fixedly connected to the inner circumference of the outer shielding housing, an assembly cavity is formed inside the inner shielding housing, a current transformer positioning body is installed on the inner shielding housing through the assembly cavity, an upper protruding sleeve cavity is formed on the upper inner wall of the inner shielding housing on the inner side of the assembly cavity, lower protruding sleeve cavities are formed on both sides of the lower inner wall of the inner shielding housing on the inner side of the assembly cavity, an upper assembly insertion hole is formed on the upper inner side of the inner shielding housing, a lower assembly insertion hole is formed on the lower inner side of the inner shielding housing, a current transformer shielding cover plate is installed at the front end of the inner shielding housing, and a current transformer mounting base is installed at the lower end of the outer shielding housing.

[0016] Preferably, the current transformer shielding cover includes a shielding cover, with a middle shielding sleeve fixedly connected through the middle of the rear end of the shielding cover. Two upper mounting rods are symmetrically fixedly connected to the upper side of the rear end of the shielding cover, and a lower sleeve hole is opened on the lower side of the rear end of the shielding cover. Below the lower sleeve hole, two lower mounting rods are symmetrically fixedly connected to the rear end of the shielding cover. The shielding cover is installed on the inner shielding shell through the upper and lower mounting rods.

[0017] Preferably, the upper mounting rod and the lower mounting rod are installed in the upper assembly socket and the lower assembly socket of the inner shielding housing, respectively.

[0018] Preferably, the current transformer mounting base includes a multi-shaped panel, which is mounted on the lower end of the outer shield housing by assembly screws. Fixed panels are symmetrically fixed to both ends of the multi-shaped panel, and a screw mounting hole is opened in the middle of the inner side of the fixed panel.

[0019] Preferably, the upper positioning protrusion and the lower positioning protrusion are positioned and sleeved in the upper protrusion sleeve cavity and the lower protrusion sleeve cavity of the inner shielding shell.

[0020] Preferably, the intermediate shielding sleeve is fitted inside the resin shell in the middle, and an internal sleeve hole is provided inside.

[0021] (III) Beneficial Effects

[0022] Compared with the prior art, the present invention provides a shielding structure for a current transformer, which has the following advantages:

[0023] 1. The current transformer shielding cover of this utility model can effectively seal the front opening of the current transformer shielding shell and is located in front of the current transformer positioning body, thereby forming a shielding enclosure area for shielding. Both the current transformer shielding cover and the current transformer shielding shell are made of permalloy, which can effectively use the magnetic circuit shunting principle to confine the external magnetic field within the shielding body and reduce interference to the transformer.

[0024] 2. This utility model, by setting a current transformer positioning body structure, can be positioned for installation. The resin shell of the current transformer positioning body is made of resin material, which is effectively insulated. An upper positioning protrusion is fixedly connected to the middle of the upper end of the resin shell for positioning from the top. Lower positioning protrusions are symmetrically fixed to both sides of the lower end of the resin shell for positioning from the bottom. The resin shell is installed on the inner shield shell through the corresponding upper and lower positioning protrusions. The resin shell can be positioned and fitted for installation, making the installation more stable. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0026] Figure 2 This is a schematic diagram of the current transformer positioning mechanism of this utility model.

[0027] Figure 3 This is a schematic diagram of the shielding housing structure of the current transformer of this utility model;

[0028] Figure 4 This is a schematic diagram of the shielding cover structure of the current transformer of this utility model.

[0029] Figure 5 This is a schematic diagram of the current transformer mounting base structure of this utility model.

[0030] In the picture:

[0031] 1. Outer shielding shell; 11. Inner shielding shell; 12. Assembly cavity; 13. Upper assembly socket; 14. Lower assembly socket; 2. Resin shell; 21. Upper positioning protrusion; 211. Upper protrusion cavity; 22. Lower positioning protrusion; 221. Lower protrusion cavity; 3. A-type panel; 31. Fixing panel; 32. Screw mounting hole; 4. Assembly screw; 5. Internal sleeve hole; 6. Magnetic core; 61. Coil; 62. Terminal rod; 7. Shielding cover; 71. Upper mounting rod; 72. Middle shielding sleeve; 73. Lower sleeve hole; 74. Lower mounting rod. Detailed Implementation

[0032] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0033] Example 1

[0034] This embodiment provides a technical solution: a shielding structure for a current transformer, such as... Figures 1-5 As shown, it includes a current transformer shielding housing, a current transformer positioning body, a current transformer shielding cover, and a current transformer mounting base.

[0035] The current transformer positioning body is sleeved and installed inside the middle of the current transformer shielding housing. This sleeved installation facilitates installation and removal within the middle of the current transformer shielding housing and ensures effective positioning. The current transformer shielding cover is installed and connected to the inner front side of the current transformer shielding housing. The shielding cover effectively closes the front opening of the current transformer shielding housing and is located in front of the positioning body, thus forming a shielding enclosure. The current transformer mounting base is installed and connected to the lower end of the current transformer shielding housing. The current transformer shielding housing can be installed in a designated position via screws using the mounting base, facilitating installation and removal.

[0036] like Figures 1-3As shown, the current transformer shielding housing includes an outer shielding housing 1, and an inner shielding housing 11 is fixedly connected to the inside of the outer shielding housing 1. Both the outer and inner shielding housings are made of permalloy. The outer and inner shielding housings 1 and 11 can effectively utilize the magnetic circuit shunting principle to confine the external magnetic field within the shielding body, reducing interference to the transformer. An assembly cavity 12 is provided inside the inner shielding housing 11 for corresponding installation. The current transformer positioning body is installed on the inner shielding housing 11 through the assembly cavity 12, facilitating installation. An upper protruding groove cavity 211 is provided on the inner wall of the upper end of the inner shielding housing 11. The lower inner wall of the side shielding housing 11 has lower convex sleeve cavities 221 on both sides. The current transformer positioning body can be sleeved and positioned through the area of ​​the upper convex sleeve cavity 211 and the lower convex sleeve cavity 221, and can be stably installed. The upper inner side of the inner shielding housing 11 has an upper assembly insertion hole 13, and the lower inner side of the inner shielding housing 11 has a lower assembly insertion hole 14. The upper assembly insertion hole 13 and the lower assembly insertion hole 14 can be inserted and installed. The front end of the inner shielding housing 11 is equipped with a current transformer shielding cover plate to facilitate the sealing of the front end during installation. The lower end of the outer shielding housing 1 is equipped with a current transformer mounting base, which facilitates the corresponding installation of the outer shielding housing 1.

[0037] The current transformer positioning body includes a resin housing 2, which is made of resin material and provides effective insulation. An upper positioning protrusion 21 is fixedly connected to the middle of the upper end of the resin housing 2 for positioning from the top. A magnetic core 6 is installed inside the upper end of the resin housing 2, and a coil 61 is wound around the periphery of the magnetic core 6. The magnetic core 6 and the coil 61 around the periphery facilitate the normal functioning of the entire current transformer. The two ends of the coil 61 pass through the resin housing 2 and are fixedly connected to the terminal rod 62 for easy electrical connection to the outside. Lower positioning protrusions 22 are symmetrically fixed to both sides of the lower end of the resin housing 2 for positioning from the bottom. The resin housing 2 is installed on the inner shield housing 11 through the upper positioning protrusion 21 and the lower positioning protrusion 22 respectively. The resin housing 2 can be positioned and fitted for installation, making it more stable during installation.

[0038] The upper positioning protrusion 21 and the lower positioning protrusion 22 are positioned and sleeved in the upper protrusion sleeve cavity 211 and the lower protrusion sleeve cavity 221 of the inner shielding shell 11, and can be correspondingly sleeved and installed for easy assembly.

[0039] During use, the current transformer positioning body is fitted and installed inside the middle of the current transformer shielding housing. The fitting and positioning of the current transformer positioning body facilitates installation and removal within the middle of the current transformer shielding housing and ensures effective positioning. The current transformer shielding cover effectively closes the front opening of the current transformer shielding housing and is located in front of the current transformer positioning body, thus forming a shielding enclosure area for shielding. The current transformer shielding housing can be installed in the designated position with screws via the current transformer mounting base at the lower end, facilitating installation and removal.

[0040] Example 2

[0041] This embodiment is a further optimization based on Embodiment 1. The parts that are the same as those described above will not be repeated here. Figure 1 , Figure 3 and Figure 4 As shown, to further better realize this utility model, the following configuration is specifically adopted: The current transformer shielding cover includes a shielding cover 7, which is made of permalloy. The shielding cover 7 can effectively use the magnetic circuit shunting principle to confine the external magnetic field within the shielding body, reducing interference to the transformer. A middle shielding sleeve 72 is fixedly connected through the middle of the rear end of the shielding cover 7. The middle shielding sleeve 72 is also made of permalloy, thus effectively shielding. Two upper mounting rods 71 ​​are symmetrically fixedly connected to the upper rear end of the shielding cover 7, which can be inserted and installed from the upper side. A lower sleeve hole 73 is opened on the lower rear end of the shielding cover 7, which facilitates the corresponding passage of the terminal rod 62. Below the lower sleeve hole 73, two lower mounting rods 74 are symmetrically fixedly connected to the rear end of the shielding cover 7, which can be inserted and installed from the lower side. The shielding cover 7 is installed on the inner shielding shell 11 through the upper mounting rods 71 ​​and the lower mounting rods 74, so that the shielding cover 7 can be stably inserted and installed.

[0042] The upper mounting rod 71 and the lower mounting rod 74 are respectively installed in the upper assembly socket 13 and the lower assembly socket 14 of the inner shielding shell 11, and can be correspondingly fitted and placed for easy assembly.

[0043] The intermediate shielding sleeve 72 is fitted inside the middle of the resin housing 2, and has an internal sleeve hole 5 inside, which can be fitted and installed accordingly.

[0044] Example 3

[0045] This embodiment is a further optimization based on Embodiment 1. The parts that are the same as those described above will not be repeated here. Figure 1 , Figure 3 and Figure 5As shown, to further better realize this utility model, the following arrangement is specifically adopted: the current transformer mounting base includes a multi-shaped panel 3, which is mounted on the lower end of the outer shield housing 1 by assembly screws 4, so that it can be installed and connected accordingly. Fixed panels 31 are symmetrically fixed at both ends of the multi-shaped panel 3. The multi-shaped panel 3 can contact the mounting surface through the fixed panels 31. A screw mounting hole 32 is opened in the middle of the inner side of the fixed panel 31. After contact, the fixed panel 31 can be installed and fixed by screws installed in the screw mounting holes 32.

[0046] The above are merely specific embodiments of this utility model, but the technical features of this utility model are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on this utility model to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of this utility model.

Claims

1. A shielding structure for a current transformer, characterized in that, include: Current transformer shielding housing; A current transformer positioning body is sleeved and installed inside the shielding shell of the current transformer in the middle. A current transformer shielding cover is installed and connected to the inner front end of the current transformer shielding housing and is located in front of the current transformer positioning body. The current transformer mounting base is installed and connected to the lower end of the current transformer shielding housing. The current transformer positioning body includes a resin housing (2), with an upper positioning protrusion (21) fixedly connected to the middle of the upper end of the resin housing (2). A magnetic core (6) is installed inside the upper end of the resin housing (2), and a coil (61) is wound around the periphery of the magnetic core (6). The two ends of the coil (61) pass through the resin housing (2) and are fixedly connected to terminal rods (62). Lower positioning protrusions (22) are symmetrically fixed to both sides of the lower end of the resin housing (2). The resin housing (2) is installed on the inner shielding housing (11) through the upper positioning protrusion (21) and the lower positioning protrusion (22).

2. The shielding structure of a current transformer according to claim 1, characterized in that: The current transformer shielding housing includes an outer shielding housing (1), an inner shielding housing (11) is fixedly connected to the inner circumference of the outer shielding housing (1), an assembly cavity (12) is opened inside the inner shielding housing (11), a current transformer positioning body is installed on the inner shielding housing (11) through the assembly cavity (12), an upper protruding sleeve cavity (211) is opened on the inner side of the assembly cavity (12) at the upper end of the inner shielding housing (11), lower protruding sleeve cavities (221) are opened on both sides of the inner side of the assembly cavity (12) at the lower end of the inner shielding housing (11), an upper assembly insertion hole (13) is opened on the inner side of the upper end of the inner shielding housing (11), a lower assembly insertion hole (14) is opened on the inner side of the lower end of the inner shielding housing (11), a current transformer shielding cover plate is installed at the front end of the inner shielding housing (11), and a current transformer mounting base is installed at the lower end of the outer shielding housing (1).

3. The shielding structure of a current transformer according to claim 2, characterized in that: The current transformer shielding cover includes a shielding cover (7), with a middle shielding sleeve (72) fixedly connected through the middle of the rear end of the shielding cover (7). Two upper mounting rods (71) are symmetrically fixedly connected to the upper side of the rear end of the shielding cover (7). A lower sleeve hole (73) is opened on the lower side of the rear end of the shielding cover (7). Below the lower sleeve hole (73), two lower mounting rods (74) are symmetrically fixedly connected to the rear end of the shielding cover (7). The shielding cover (7) is installed on the inner shielding shell (11) through the upper mounting rods (71) and the lower mounting rods (74).

4. The shielding structure of a current transformer according to claim 3, characterized in that: The upper mounting rod (71) and the lower mounting rod (74) are respectively installed in the upper assembly socket (13) and the lower assembly socket (14) of the inner shielding shell (11).

5. The shielding structure of a current transformer according to claim 2, characterized in that: The current transformer mounting base includes a multi-type panel (3), which is mounted on the lower end of the outer shield housing (1) by assembly screws (4). Fixed panels (31) are symmetrically fixed at both ends of the multi-type panel (3), and screw mounting holes (32) are opened in the middle of the inner side of the fixed panel (31).

6. The shielding structure of a current transformer according to claim 1, characterized in that: The upper positioning protrusion (21) and the lower positioning protrusion (22) are positioned and sleeved in the upper protrusion sleeve cavity (211) and the lower protrusion sleeve cavity (221) of the inner shielding shell (11).

7. The shielding structure of a current transformer according to claim 3, characterized in that: The intermediate shielding sleeve (72) is fitted inside the resin shell (2) and has an internal sleeve hole (5).

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