Electromagnetic shielding cut-off waveguide window structure

Abstract

The utility model discloses an electromagnetic shielding cut-off waveguide window structure, which comprises a first plate body, a second plate body and a third plate body, the second plate body is connected to the lower portion of the first plate body, and a plurality of second ventilation holes are formed in the second plate body. According to the electromagnetic shielding cut-off waveguide window structure, the short-circuit elements are arranged in the second ventilation holes and the third ventilation holes, and the short-circuit elements are not arranged in the first ventilation holes and the fourth ventilation holes, so that external cold air passes through the first ventilation holes and the third ventilation holes to enter the box body, and passes through the short-circuit elements on the third ventilation holes; and external electromagnetic waves are shielded, and hot air in the box body is exhausted through a plurality of fourth vent holes through second vent holes, so that the ventilation space in the first vent holes and the second vent holes is relatively large, the short-circuit elements do not occupy the ventilation space of the first vent holes and the second vent holes, and the ventilation and heat dissipation effects are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic shielding, in particular to an electromagnetic shielding cutoff waveguide window structure. Background Art

[0002] With the development of power electronics technology, the problem of electromagnetic radiation has become more prominent. At present, electronic equipment will be equipped with shielding windows to avoid external electromagnetic interference. The shielding windows must meet the requirements of ventilation and heat dissipation, and also shield the interference of external electromagnetic waves on the equipment in the chassis.

[0003] At present, in order to enhance the electromagnetic shielding effect, the existing shielding windows generally place a tubular cavity structure made of metal with high-pass filtering characteristics in the ventilation hole. However, the tubular cavity structure with high-pass filtering characteristics will occupy most of the space of the ventilation hole, resulting in a smaller ventilation space inside the ventilation hole, affecting the ventilation and heat dissipation effect. Utility Model Content

[0004] The utility model aims to solve the shortcomings existing in the prior art, and proposes an electromagnetic shielding cutoff waveguide window structure, comprising: a first plate body, a first ventilation hole is opened in the middle of the first plate body; a second plate body, the second plate body is connected under the first plate body, and a plurality of second ventilation holes are opened on the second plate body; a third plate body, the third plate body is connected under the second plate body, and a plurality of third ventilation holes are opened on the third plate body; a fourth plate body, the fourth plate body is connected under the third plate body, and a fourth ventilation hole is opened on the fourth plate body; a short-circuit element, the short-circuit element is arranged on the second ventilation hole and the third ventilation hole; the first ventilation hole is connected to the third ventilation hole, and the second ventilation hole is connected to the fourth ventilation hole.

[0005] As a further description of the above technical solution: the short-circuit element is a metal sheet.

[0006] As a further description of the above technical solution: three second ventilation holes are provided, and three third ventilation holes are provided.

[0007] As a further description of the above technical solution: the short-circuit element is a metal pin.

[0008] As a further description of the above technical solution: the three second ventilation holes are evenly spaced and distributed on the second plate body, and the three third ventilation holes are evenly spaced and distributed on the third plate body.

[0009] As a further description of the above technical solution: the first plate body and the fourth plate body have the same structure.

[0010] As a further description of the above technical solution: the second plate body has the same structure as the third plate body.

[0011] The above technical solution has the following advantages or beneficial effects:

[0012] The utility model arranges short-circuit elements in the second ventilation holes and the third ventilation holes, and does not arrange short-circuit elements in the first ventilation holes and the fourth ventilation holes, so that external cold air enters the interior of the box through the first ventilation holes and the plurality of third ventilation holes, and the short-circuit elements on the third ventilation holes are used to shield external electromagnetic waves, and the hot air inside the box is discharged through the second ventilation holes through the plurality of fourth ventilation holes, so that the ventilation space in the first ventilation holes and the second ventilation holes is larger, the short-circuit elements will not occupy the ventilation space of the first ventilation holes and the second ventilation holes, and the ventilation and heat dissipation effect is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural schematic diagram of an electromagnetic shielding cutoff waveguide window structure in an embodiment of the utility model;

[0014] Figure 2 It is a side view of an electromagnetic shielding cutoff waveguide window structure in one embodiment of the utility model;

[0015] Figure 3 A top view of an electromagnetic shielding cutoff waveguide window structure in an embodiment of the utility model;

[0016] Figure 4 It is a bottom view of the electromagnetic shielding cutoff waveguide window structure in one embodiment of the utility model.

[0017] Legend:

[0018] 1. First plate; 2. Second plate; 3. Third plate; 4. Fourth plate; 5. Short-circuit element; 6. First ventilation hole; 7. Second ventilation hole; 8. Third ventilation hole; 9. Fourth ventilation hole. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "set", "connected", and "connected" 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.

[0022] See also Figure 1-4 The utility model provides a technical solution: an electromagnetic shielding cutoff waveguide window structure of the utility model includes: a first plate body 1, a first ventilation hole 6 is opened in the middle of the first plate body 1; a second plate body 2, the second plate body 2 is connected to the bottom of the first plate body 1, and a plurality of second ventilation holes 7 are opened on the second plate body 2; a third plate body 3, the third plate body 3 is connected to the bottom of the second plate body 2, and a plurality of third ventilation holes 8 are opened on the third plate body 3; a fourth plate body 4, the fourth plate body 4 is connected to the bottom of the third plate body 3, and a fourth ventilation hole 9 is opened on the fourth plate body 4; a short-circuit element 5, the short-circuit element 5 is arranged on the second ventilation hole 7 and the third ventilation hole 8; the first ventilation hole 6 is connected to the third ventilation hole 8, and the second ventilation hole 7 is connected to the fourth ventilation hole 9.

[0023] In this embodiment, an electromagnetic shielding cutoff waveguide window is formed by a plurality of electromagnetic shielding cutoff waveguide window structures to shield the interference of external electromagnetic waves on the equipment in the chassis. By arranging the short-circuit element 5 in the second ventilation hole 7 and the third ventilation hole 8, and not arranging the short-circuit element 5 in the first ventilation hole 6 and the fourth ventilation hole 9, the first ventilation hole 6 is connected with the third ventilation hole 8, and the second ventilation hole 7 is connected with the fourth ventilation hole 9, so that the external cold air enters the interior of the box through the first ventilation hole 6 and the plurality of third ventilation holes 8, and the short-circuit element 5 on the third ventilation hole 8 is used to shield the external electromagnetic waves, and the hot air in the box is discharged through the second ventilation hole 7 through the plurality of fourth ventilation holes 9, so that the ventilation space in the first ventilation hole 6 and the second ventilation hole 7 is larger, and the short-circuit element 5 will not occupy the ventilation space of the first ventilation hole 6 and the second ventilation hole 7, thereby improving the ventilation and heat dissipation effect.

[0024] like Figure 1 and Figure 3As shown, specifically, the short-circuit element 5 is a metal sheet; the several metal sheets loaded in the second ventilation hole 7 and the third ventilation hole are thin metal sheets with strong conductivity, and the loaded metal sheets connect the two parallel side walls of the ventilation hole. When the electromagnetic wave is input into the ventilation hole from one end of the ventilation hole, the electromagnetic wave is attenuated by the capacitive metal diaphragm, and the electromagnetic shielding efficiency of the waveguide window will be significantly improved.

[0025] like Figure 1 and Figure 4 As shown, specifically, the short-circuit element 5 is a metal pin; the metal pins loaded in the second ventilation hole 7 and the third ventilation hole are metal columns with strong conductivity and a radius much smaller than the waveguide wavelength. The inserted metal pins are located at the center of the ventilation holes. When electromagnetic waves enter the waveguide cavity for transmission, an induced current will be generated on the surface of the pins, which will attenuate the electromagnetic waves in the waveguide cavity, thereby improving the shielding effectiveness.

[0026] like Figure 1 and Figure 2 As shown, specifically, three second ventilation holes 7 are provided, and three third ventilation holes 8 are provided. The three second ventilation holes 7 are evenly spaced on the second plate body 2, and the three third ventilation holes 8 are evenly spaced on the third plate body 3. The first plate body 1 has the same structure as the fourth plate body 4, and the second plate body 2 has the same structure as the third plate body 3.

[0027] Working principle: An electromagnetic shielding cutoff waveguide window is formed by multiple electromagnetic shielding cutoff waveguide window structures to shield the interference of external electromagnetic waves on the equipment in the chassis. By arranging the short-circuit element 5 in the second ventilation hole 7 and the third ventilation hole 8, and not arranging the short-circuit element 5 in the first ventilation hole 6 and the fourth ventilation hole 9, the first ventilation hole 6 is connected with the third ventilation hole 8, and the second ventilation hole 7 is connected with the fourth ventilation hole 9, so that the external cold air enters the interior of the box through the first ventilation hole 6 and the multiple third ventilation holes 8, and the short-circuit element 5 on the third ventilation hole 8 is used to shield the external electromagnetic waves, and the hot air in the box is discharged through the second ventilation hole 7 through the multiple fourth ventilation holes 9, so that the ventilation space in the first ventilation hole 6 and the second ventilation hole 7 is larger, and the short-circuit element 5 will not occupy the ventilation space of the first ventilation hole 6 and the second ventilation hole 7, thereby improving the ventilation and heat dissipation effect.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An electromagnetic shielding cutoff waveguide window structure, characterized in that: include: A first plate body (1), wherein a first ventilation hole (6) is provided in the middle of the first plate body (1); A second plate body (2), the second plate body (2) being connected below the first plate body (1), and the second plate body (2) being provided with a plurality of second ventilation holes (7); A third plate body (3), the third plate body (3) being connected below the second plate body (2), and the third plate body (3) being provided with a plurality of third ventilation holes (8); A fourth plate body (4), the fourth plate body (4) being connected below the third plate body (3), and the fourth plate body (4) being provided with a fourth ventilation hole (9); a short-circuit element (5), the short-circuit element (5) being arranged on the second ventilation hole (7) and the third ventilation hole (8); The first ventilation hole (6) is in communication with the third ventilation hole (8), and the second ventilation hole (7) is in communication with the fourth ventilation hole (9).

2. The electromagnetic shielding cutoff waveguide window structure according to claim 1, characterized in that: The short-circuit element (5) is a metal sheet.

3. The electromagnetic shielding cutoff waveguide window structure according to claim 1, characterized in that: Three second ventilation holes (7) are provided, and three third ventilation holes (8) are provided.

4. The electromagnetic shielding cutoff waveguide window structure according to claim 1, characterized in that: The short-circuit element (5) is a metal pin.

5. The electromagnetic shielding cutoff waveguide window structure according to claim 3, characterized in that: The three second ventilation holes (7) are distributed at equal intervals on the second plate body (2), and the three third ventilation holes (8) are distributed at equal intervals on the third plate body (3).

6. The electromagnetic shielding cutoff waveguide window structure according to claim 1, characterized in that: The first plate body (1) and the fourth plate body (4) have the same structure.

7. The electromagnetic shielding cutoff waveguide window structure according to claim 1, characterized in that: The second plate body (2) and the third plate body (3) have the same structure.

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