CN219303465U

CN219303465U - Dual shielding structure of current transformer

Info

Publication number: CN219303465U
Application number: CN202320205597.8U
Authority: CN
Inventors: 王旭
Original assignee: Shandong Changwei Electric Appliance Co ltd
Current assignee: Shandong Changwei Electric Appliance Co ltd
Priority date: 2023-02-14
Filing date: 2023-02-14
Publication date: 2023-07-04
Anticipated expiration: 2033-02-14

Abstract

The utility model discloses a double shielding structure of a current transformer, which comprises a shielding shell and a cover plate assembly, wherein the shielding shell is movably connected with the cover plate assembly, a through hole is formed in the middle of the shielding shell, an installation groove is formed in the upper portion of the shielding shell, a separation ring is arranged in the installation groove, a coil placing cavity is formed between the installation groove and the inside of the separation ring, shielding layers I are paved on the inner side inner wall, the outer side inner wall and the bottom inner wall of the coil placing cavity, and the cover plate assembly comprises a shielding cover, four telescopic units and a sealing fixing ring matched with the coil placing cavity. The utility model is provided with the shielding shell, the isolating ring, the shielding layer I, the shielding cover, the telescopic unit, the sealing fixing ring and the shielding layer II, and can form a double shielding structure, thereby improving the shielding effect of the whole magnetic field generated by the coil and having good shielding effect.

Description

Dual shielding structure of current transformer

Technical Field

The utility model relates to the technical field of current transformers, in particular to a double-shielding structure of a current transformer.

Background

The current transformer principle is based on the electromagnetic induction principle. The current transformer consists of a closed iron core and windings. The primary winding turns are very few and are connected in series with the circuit of the current to be measured, so that the current is always flowing through the circuit, the secondary winding turns are relatively large and are connected in series with the measuring instrument and the protection circuit, and the secondary circuit is always closed when the current transformer works, so that the impedance of the series coil of the measuring instrument and the protection circuit is very small, and the working state of the current transformer is close to short circuit. The current transformer is used by converting primary side large current into secondary side small current, and the secondary side cannot be opened.

The shielding structure of the traditional current transformer mainly depends on the outer shell of the traditional current transformer to shield, and the electromagnetic shielding effect is general, when the installation positions of all elements are scattered, the shielding requirement can be met, but once the installation positions of all elements are relatively compact, the operation of other components can be influenced due to poor electromagnetic shielding effect, so that the double shielding structure of the current transformer is needed.

Disclosure of Invention

The utility model aims to provide a double shielding structure of a current transformer, which is used for solving the problems in the background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a dual shielding structure of current transformer, includes shielding shell and apron subassembly, shielding shell with apron subassembly swing joint, the centre of shielding shell has seted up the cross hole, just the mounting groove has been seted up on shielding shell's upper portion, be provided with the isolating ring in the mounting groove, the mounting groove with be provided with the coil between the inside of isolating ring and place the chamber, just shielding layer one has all been laid on the inboard inner wall, outside inner wall and the bottom inner wall in chamber are placed to the coil, the apron subassembly includes shielding cover, four flexible units and places the sealed solid fixed ring of chamber matching with the coil, the bottom of sealed solid fixed ring is provided with shielding layer two, four flexible units are fixed shielding cover's bottom, solid fixed ring fixes the bottom at four flexible units.

Preferably, a fixing seat is further arranged at the bottom of the shielding shell, and four bolt mounting holes are formed in the fixing seat.

Preferably, a wire hole communicated with the coil placing cavity is formed between the isolating ring and the outer wall of the shielding shell.

Preferably, an annular clamping groove I is formed in the edge position of the upper surface of the shielding shell, a sealing ring I matched with the annular clamping groove I is fixedly arranged at the edge of the bottom of the shielding cover, an annular clamping groove II is formed in the upper portion of the shielding shell, close to the position of the through hole, and a sealing ring II matched with the annular clamping groove II is arranged at the bottom of the shielding cover.

Preferably, a connecting ring is arranged at the bottom of the shielding cover, an external thread is arranged on the outer wall of the connecting ring, and the connecting ring is in threaded connection with the inner wall of the outer side of the upper end of the mounting groove through the external thread.

Preferably, the telescopic unit comprises a telescopic rod and a reset spring, the telescopic rod is fixed between the shielding cover and the sealing fixing ring, and the reset spring is sleeved on the surface of the telescopic rod.

Compared with the prior art, the utility model has the beneficial effects that: the utility model is provided with the shielding shell, the isolating ring, the shielding layer I, the shielding cover, the telescopic unit, the sealing fixing ring and the shielding layer II, and can form a double shielding structure, thereby improving the shielding effect of the whole magnetic field generated by the coil and having good shielding effect.

Drawings

FIG. 1 is a schematic view of an external split structure of the present utility model;

FIG. 2 is a schematic view of the shielding shell of the present utility model;

fig. 3 is a schematic structural view of a cover plate assembly according to the present utility model.

In the figure: 1. a shielding housing; 2. a cover plate assembly; 21. a shielding cover; 22. a telescoping unit; 23. a sealing and fixing ring; 3. a spacer ring; 4. a coil placement cavity; 5. a first shielding layer; 6. a connecting ring; 7. a fixing seat; 8. a first sealing ring; 9. a second sealing ring; 10. and a shielding layer II.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-3, the present utility model provides a technical solution: the utility model provides a double shielding structure of current transformer, including shielding shell 1 and apron subassembly 2 that metal material was made, shielding shell 1 and apron subassembly 2 swing joint, the centre of shielding shell 1 has been seted up and has been crossed the heart hole, and the upper portion integrated into one piece's of shielding shell 1 mounting groove, install the spacer ring 3 in the welding of mounting groove, install coil between the inside of mounting groove and spacer ring 3 and place chamber 4, and coil place chamber 4 inboard inner wall, outside inner wall and bottom inner wall all lay shielding layer one 5, apron subassembly 2 includes shielding cover 21 that metal material was made, four flexible units 22 and the sealed solid ring 23 that matches with coil place chamber 4, shielding layer two 10 is installed to the bottom of sealed solid ring 23, shielding layer one 5 and shielding layer two 10 are made by the aluminium foil material, four flexible units 22 are fixed in the bottom of shielding cover 21, the solid ring is fixed in the bottom of four flexible units 22;

the bottom of the shielding shell 1 is also provided with a fixed seat 7, and four bolt mounting holes are formed in the fixed seat 7;

a wire hole communicated with the coil placing cavity 4 is formed between the isolating ring 3 and the outer wall of the shielding shell 1 and is used for conducting wire routing, and sealing treatment is carried out through external sealant;

an annular clamping groove I is formed in the edge position of the upper surface of the shielding shell 1, a sealing ring I8 matched with the annular clamping groove I is fixedly arranged at the edge of the bottom of the shielding cover 21, an annular clamping groove II is formed in the upper part of the shielding shell 1 close to the center hole, and a sealing ring II 9 matched with the annular clamping groove II is arranged at the bottom of the shielding cover 21;

the bottom of the shielding cover 21 is provided with a connecting ring 6, the outer wall of the connecting ring 6 is provided with external threads, and the connecting ring 6 is in threaded connection with the inner wall of the outer side of the upper end of the mounting groove through the external threads;

the telescopic unit 22 comprises a telescopic rod and a reset spring, the telescopic rod is fixed between the shielding cover 21 and the sealing fixing ring 23, and the reset spring is sleeved on the surface of the telescopic rod.

Working principle: when the shielding device is used, the connecting ring 6 on the shielding cover 21 is fixedly connected with the inner wall of the mounting groove in the shielding shell 1 through threads, at the moment, the sealing fixing ring 23 is embedded in the coil placing cavity 4 and is abutted with the coil in the coil placing cavity 4, the shielding layer I5 is paved on the bottom and two side surfaces of the coil placing cavity 4, and meanwhile, the shielding layer II 10 is installed on the bottom of the sealing fixing ring 23 embedded in the coil placing cavity 4, so that the coil placing cavity 4 forms an inner shielding space, and meanwhile, the outer shielding space formed by the shielding shell 1 and the shielding cover 21 is combined, so that a magnetic field generated by a coil winding in the coil placing cavity 4 can be effectively shielded, and a good shielding effect is achieved.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a dual shielding structure of current transformer, includes shielding shell (1) and apron subassembly (2), its characterized in that: the utility model provides a shielding cover, including cover plate assembly (2), shield shell (1) with apron subassembly (2) swing joint, the cross hole has been seted up in the centre of shield shell (1), just the mounting groove has been seted up on the upper portion of shield shell (1), be provided with isolating ring (3) in the mounting groove, the mounting groove with be provided with coil between the inside of isolating ring (3) and place chamber (4), just shielding layer one (5) have all been laid on the inboard inner wall, outside inner wall and the bottom inner wall of chamber (4) are placed to the coil, apron subassembly (2) include shield cover (21), four flexible unit (22) and with coil place chamber (4) matched sealed solid fixed ring (23), the bottom of sealed solid fixed ring (23) is provided with shielding layer two (10), four flexible unit (22) are fixed the bottom of shield cover (21), solid fixed ring fixes the bottom of four flexible units (22).

2. The dual shielding structure of a current transformer according to claim 1, wherein: the bottom of shielding shell (1) still is provided with fixing base (7), four bolt mounting holes have been seted up on fixing base (7).

3. The dual shielding structure of a current transformer according to claim 1, wherein: a wire hole communicated with the coil placing cavity (4) is formed between the isolating ring (3) and the outer wall of the shielding shell (1).

4. The dual shielding structure of a current transformer according to claim 1, wherein: the novel shielding device is characterized in that an annular clamping groove I is formed in the edge position of the upper surface of the shielding shell (1), a sealing ring I (8) matched with the annular clamping groove I is fixedly arranged at the edge of the bottom of the shielding cover (21), an annular clamping groove II is formed in the upper portion of the shielding shell (1) close to the position of the through hole, and a sealing ring II (9) matched with the annular clamping groove II is arranged at the bottom of the shielding cover (21).

5. The dual shielding structure of a current transformer according to claim 1, wherein: the bottom of shielding lid (21) is provided with go-between (6), be provided with the external screw thread on the outer wall of go-between (6), go-between (6) through the external screw thread with the upper end outside inner wall threaded connection of mounting groove.

6. The dual shielding structure of a current transformer according to claim 1, wherein: the telescopic unit (22) comprises a telescopic rod and a reset spring, the telescopic rod is fixed between the shielding cover (21) and the sealing fixing ring (23), and the reset spring is sleeved on the surface of the telescopic rod.