Shielding structure of current transformer

Abstract

The shielding structure of the current transformer comprises a shielding shell and a shielding cover arranged at the upper end of the shielding shell, side plates are fixed to the two sides of the bottom of the shielding cover, and a ventilation pipe with the two ends open is fixed between the side plates. The two sides of the shielding shell are provided with connecting ports in a penetrating manner, wherein the side plates and the ventilation pipes are vertically inserted into the connecting ports. Compared with the prior art, the shielding structure of the current transformer has the advantages that the shielding structure of the current transformer is provided with a special ventilation system, such as the ventilation pipes and the exhaust fans on the side plates, so that internal heat can be effectively dissipated to the outside, the heat dissipation efficiency of the whole system is improved, and the service life of the system is prolonged; the problem that heat is difficult to dissipate due to the fact that an existing mutual inductor shielding structure is designed in a closed mode is solved. And 2) through the arrangement of the limiting assembly, when the shielding cover is closed, the mutual inductor placed in the box body can be pressed through a reset spring and a protection plate, so that the mutual inductor is conveniently limited.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformer equipment, in particular to a shielding structure of a current transformer. Background Art

[0002] During use, current transformers are affected by external electromagnetic interference, such as electromagnetic interference from surrounding electrical equipment and communication systems, which can affect the accuracy of current transformers. Therefore, in order to reduce the impact of electromagnetic interference on current transformers, shielding structures are usually set around current transformers.

[0003] The Chinese utility model patent with application number 202021186385.2 discloses a novel shielding shell installation structure for a current transformer, which realizes electromagnetic shielding by placing the current transformer in a shielding shell. The inventor believes that the current transformer will generate heat during operation, and the closed design of the shielding shell will affect the heat loss, thereby affecting the working life of the current transformer. Simply dissipating heat by opening a heat dissipation port will easily cause dust to enter. Therefore, this application proposes a shielding structure for a current transformer to solve the above problems. Utility Model Content

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a shielding structure of a current transformer to solve the above problem.

[0005] To achieve the above-mentioned purpose, the utility model provides a shielding structure of a current transformer, including a shielding shell and a shielding cover arranged at the upper end of the shielding shell, side panels are fixed on both sides of the bottom of the shielding cover, and a ventilation pipe with openings at both ends is fixed between the side panels on both sides of the shielding cover, connecting ports are penetrated on both sides of the shielding shell, the side panels on both sides of the shielding cover are slid from top to bottom and inserted into the connecting ports, and the two ends of the ventilation pipe are arranged between the connecting ports on both sides, and a limiting component for clamping the current transformer is provided at the bottom of the ventilation pipe.

[0006] Preferably, the number of the ventilation pipes is at least two.

[0007] Preferably, a stopper is integrally formed on the outer side of the connecting port of the shielding shell, and bolts are connected between the stopper and the side plate.

[0008] Preferably, an exhaust fan is fixedly mounted on the side of the shielding shell, and an air inlet of the exhaust fan faces one end of the ventilation duct.

[0009] Preferably, a cover is fixed to the side of the shielding shell, and the air inlet of the exhaust fan is connected to the interior of the cover via a connecting pipe. The cover is specifically configured so that when the ventilation pipe is inserted into the connecting port, the interior of the ventilation pipe is connected to the interior of the cover.

[0010] Preferably, the limiting assembly includes a protective plate and a return spring connected between the protective plate and the ventilation pipe.

[0011] Preferably, the limiting assembly is a rubber block, and the rubber block is fixedly connected to the ventilation pipe.

[0012] Compared with the prior art, the utility model has the following benefits: 1) The shielding structure of the current transformer of the utility model can effectively dissipate the internal heat to the outside by setting up a special ventilation system, such as the ventilation duct and exhaust fan on the side panel, thereby improving the heat dissipation efficiency of the entire system and solving the problem that the heat is difficult to dissipate due to the closed design of the existing transformer shielding structure; 2) The utility model sets a limit assembly, and when the shielding cover is closed, the transformer placed in the box body can be pressed by the reset spring and the protective plate, thereby facilitating the limiting of the transformer; 3) The ventilation duct of the utility model "crosses" the two ends of the entire shielding shell, so the interior of the shielding shell is still relatively closed, thereby improving the heat dissipation effect while preventing dust from entering. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 It is a schematic diagram of the explosion structure of the utility model.

[0016] Figure 3 It is a schematic diagram of the side structure of the utility model.

[0017] Figure 4 This is another three-dimensional structural schematic diagram of the utility model.

[0018] Figure 5 It is a structural schematic diagram of the shielding cover of the utility model.

[0019] In the figure: 10, shielding shell; 11, connecting port; 12, block; 13, bolt; 14, terminal; 20, shielding cover; 21, side panel; 22, ventilation duct; 30, exhaust fan; 31, cover; 32, connecting pipe; 40, limit assembly; 41a, return spring; 42a, protective plate; 41b, rubber block. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1-5 The specific implementation modes of the present utility model are further described in detail.

[0021] Depend on Figure 1-5 The utility model provides a shielding structure of a current transformer, including a shielding shell 10 and a shielding cover 20 arranged at the upper end of the shielding shell 10, a terminal 14 is installed on the side of the shielding shell 10, and the transformer placed in the shielding shell 10 is connected to the end of the terminal 14 located inside the shielding shell 10, and the end of the terminal 14 located outside the shielding shell 10 is used to connect to the external circuit. The above structure is the shielding structure of the existing current transformer, so in this embodiment, it is not described in detail. The key improvements of this embodiment are:

[0022] Side plates 21 are fixed on both sides of the bottom of the shielding cover 20, and ventilation pipes 22 with openings at both ends are fixed between the side plates 21 on both sides of the shielding cover 20. Connecting ports 11 are penetrated on both sides of the shielding shell 10. The side plates 21 on both sides of the shielding cover 20 are slidably inserted into the connecting ports 11 from top to bottom, and the two ends of the ventilation pipe 22 are arranged between the connecting ports 11 on both sides of the shielding shell 10. When in use, the transformer is placed in the shielding shell 10, and the transformer is connected to the terminal 14 before closing the shielding cover 20. When the shielding cover 20 is closed, the upper end of the shielding shell 10 is closed, and when the shielding cover 20 is closed, the side plates 21 will be inserted into the connecting ports 11 on the side of the shielding shell 10, and the side of the shielding shell 10 is also closed, thereby achieving the closure of the shielding shell 10;

[0023] A ventilation pipe 22 is fixed between the side plates 21, and both ends of the ventilation pipe 22 are arranged between the connection ports 11 on both sides of the shielding shell 10. The ventilation pipe 22 "crosses" both ends of the entire shielding shell 10, so that the shielding shell 10 looks like Figure 3 As shown, the inner space of the ventilation pipe 22 is isolated from the inner space of the shielding shell 10 to prevent dust from entering, while the outside air can pass through the inside of the shielding shell 10 through the ventilation pipe 22 and take away some heat, which not only ensures the protection effect of the mutual inductor inside the shielding shell 10, but also improves the heat dissipation performance of the shielding shell 10.

[0024] The number of the ventilation pipes 22 is at least two, and the ventilation pipes 22 are preferably copper pipes. Copper is an antimagnetic material, and magnetism is difficult to conduct through copper. Copper also has a good thermal conductivity.

[0025] The shielding shell 10 is integrally formed with a stopper 12 on the outer side of the connection port 11, and a bolt 13 is connected between the stopper 12 and the side panel 21. When installing the shielding cover 20, the side panel 21 is inserted into the connection port 11, and the side panel 21 is limited by the stopper 12, so that the side panel 21 cannot move left and right after being inserted into the connection port 11, but the side panel 21 can be fixed by the bolt 13.

[0026] In order to enhance the heat dissipation effect of the shielding shell 10, an exhaust fan 30 is fixedly installed on the side of the shielding shell 10, and the air inlet of the exhaust fan 30 is opposite to one end of the ventilation duct 22. When the temperature inside the shielding shell 10 is very high, the external power supply of the exhaust fan 30 can be turned on, and the flow speed of the air in the ventilation duct 22 is increased by the exhaust fan 30, thereby improving the heat dissipation efficiency.

[0027] Specifically, a cover 31 is fixed to the side of the shielding shell 10, and the air inlet of the exhaust fan 30 is connected to the interior of the cover 31 through a connecting pipe 32. The cover 31 is specifically configured as follows: when the ventilation pipe 22 is inserted into the connecting port 11, the interior of the ventilation pipe 22 is connected to the interior of the cover 31.

[0028] In order to facilitate the limiting of the current transformer in the shielding shell 10 , a limiting component 40 for pressing the current transformer is provided at the bottom of the ventilation pipe 22 .

[0029] In this embodiment, the limiting assembly 40 includes a protective plate 41a and a reset spring 42a connected between the protective plate 41a and the ventilation pipe 22. When in use, the current transformer is first placed in the shielding shell 10, and then the shielding cover 20 is covered on the shielding shell 10. The protective plate 41a is pressed against the upper end of the current transformer by the elastic force of the reset spring 42a, which facilitates the limiting of the current transformer.

[0030] In some embodiments, the limiting component 40 can also be a rubber block 41b, which is fixedly connected to the bottom of the ventilation pipe 22. When the shielding cover 20 is closed, the ventilation pipe 22 can press the current transformer through the rubber block 41b, thereby facilitating the limiting of the current transformer and preventing the current transformer from shaking freely in the shielding shell 10.

[0031] A shielding structure of a current transformer, the working principle is as follows:

[0032] When installing the current transformer, place the transformer into the shielding shell 10, connect the transformer to the terminal 14, and then close the shielding cover 20, and fix the shielding cover 20 with the bolts 13. When the shielding cover 20 is closed, the reset spring 42 presses the transformer through the protective plate 42, which is convenient for limiting the transformer. After the shielding cover 20 is closed, the shielding shell 10 is open at both ends due to the setting of the ventilation pipe 22. In this way, when air flows in the ventilation pipe 22, part of the heat on the surface of the ventilation pipe 22 can be taken away. In addition, an exhaust fan 30 is also provided at one end of the ventilation pipe 22. By connecting the external power supply of the exhaust fan 30, the flow speed of the air in the ventilation pipe 22 can be increased, thereby improving the heat dissipation efficiency.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A shielding structure of a current transformer, comprising a shielding shell (10) and a shielding cover (20) arranged on the upper end of the shielding shell (10), characterized in that: Side plates (21) are fixed to both sides of the bottom of the shielding cover (20), and a ventilation pipe (22) with openings at both ends is fixed between the side plates (21) on both sides of the shielding cover (20), and connecting ports (11) are provided through both sides of the shielding shell (10), and the side plates (21) on both sides of the shielding cover (20) are slidably inserted into the connecting ports (11) from top to bottom, and both ends of the ventilation pipe (22) are mounted between the connecting ports (11) on both sides, and a limit assembly (40) for pressing the current transformer is provided at the bottom of the ventilation pipe (22).

2. A shielding structure for a current transformer according to claim 1, characterized in that: The number of the ventilation pipes (22) is at least two.

3. The shielding structure of a current transformer according to claim 1, characterized in that: The shielding shell (10) is integrally formed with a stopper (12) located outside the connection port (11), and a bolt (13) is connected between the stopper (12) and the side plate (21).

4. The shielding structure of a current transformer according to claim 1, characterized in that: An exhaust fan (30) is fixedly mounted on the side of the shielding shell (10), and an air inlet of the exhaust fan (30) faces one end of the ventilation pipe (22).

5. The shielding structure of a current transformer according to claim 4, characterized in that: A cover (31) is fixed to the side of the shielding shell (10); an air inlet of the exhaust fan (30) is connected to the interior of the cover (31) via a connecting pipe (32); the cover (31) is specifically configured such that when the ventilation pipe (22) is inserted into the connecting port (11), the interior of the ventilation pipe (22) is connected to the interior of the cover (31).

6. The shielding structure of a current transformer according to claim 1, characterized in that: The limiting assembly (40) comprises a protective plate (41a) and a return spring (42a) connected between the protective plate (41a) and the ventilation pipe (22).

7. The shielding structure of a current transformer according to claim 1, characterized in that: The limiting component (40) is a rubber block (41b), and the rubber block (41b) is fixedly connected to the ventilation pipe (22).

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