CN210928483U - High-performance electromagnetic shielding cabinet - Google Patents

Abstract

The utility model discloses a high-performance electromagnetic shielding cabinet, which relates to the technical field of cabinets and is intended to solve the problem of relatively contradictory between the existing high-efficiency heat dissipation and the overall electromagnetic shielding. The upper end of the cabinet is provided with an installation cavity, the bottom of the installation cavity is provided with a base, a first conductive elastic body is arranged between the first electromagnetic shielding plate and the second electromagnetic shielding plate, and the first electromagnetic shielding plate is provided with a first conductive elastic body. The inner walls of the shielding plate and the second electromagnetic shielding plate are provided with hollow cotton, the interior of the rear cabinet is provided with a cooling liquid tank, the rear end of the cooling liquid tank is provided with a heat sink, and a placement plate is installed inside the cabinet body , a serpentine tube is installed at the bottom of the placement plate, the end of the serpentine tube close to the installation cavity is provided with a water outlet pipe, the end of the serpentine tube close to the base is provided with a water inlet pipe, and the placement plate is rectangular The array is provided with a number of ventilation holes, the interior of the installation cavity is provided with an air outlet duct, and the interior of the base is provided with an air intake duct.

Description

A high-performance electromagnetic shielding cabinet

technical field

The utility model relates to the technical field of cabinets, in particular to a high-performance electromagnetic shielding cabinet.

Background technique

With the gradual deepening of people's understanding of the hazard of electromagnetic leakage and emission of classified information systems, various means of preventing electromagnetic leakage and emission have been widely used in the construction of classified information networks, including the construction of electromagnetic shielding rooms, laying optical cables and shielding twisted pairs. , Use low-radiation equipment, red and black power isolation sockets, and shielded cabinets. The shielded cabinet has the characteristics of small size, convenient installation and flexible use, which is very suitable for those occasions where it is not suitable to install electromagnetic shielding rooms and needs to provide protection for information equipment. .

However, in order to meet the heat dissipation requirements of the internal components, the existing electromagnetic shielding cabinet needs to be provided with a heat dissipation mechanism, and there is a contradiction between efficient heat dissipation and strong electromagnetic shielding. The problem is poor, so it does not meet the existing needs, for which we propose a high-performance electromagnetic shielding cabinet.

Utility model content

The purpose of the present invention is to provide a high-performance electromagnetic shielding cabinet, so as to solve the relatively contradictory problem between efficient heat dissipation and overall electromagnetic shielding proposed in the above-mentioned background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a high-performance electromagnetic shielding cabinet, comprising a cabinet body, an installation cavity is arranged at the upper end of the cabinet body, a base is arranged below the installation cavity, and the cabinet body is provided with a base. Both sides of the wall are provided with first electromagnetic shielding plates, the upper and lower ends of the inner wall of the cabinet are provided with second electromagnetic shielding plates, and a second electromagnetic shielding plate is arranged between the first electromagnetic shielding plate and the second electromagnetic shielding plate. A conductive elastic body, the inner walls of the first electromagnetic shielding plate and the second electromagnetic shielding plate are provided with hollow cotton, the rear end of the cabinet is provided with a rear cabinet, and the interior of the rear cabinet is provided with a cooling liquid tank, The rear end of the cooling liquid tank is provided with a heat dissipation seat, one side of the heat dissipation seat is provided with heat dissipation fins, a plurality of heat dissipation fins are provided, and the heat dissipation fins are distributed in sequence, and one side of the cooling liquid tank is installed There is a pressurizing pump, a placement plate is installed inside the cabinet, several placement plates are installed, and the placement plates are distributed in sequence, the bottom of the placement plate is installed with a serpentine tube, and the serpentine tubes are installed between There is a connecting pipe, one end of the serpentine pipe close to the installation cavity is provided with a water outlet pipe, and the water outlet pipe extends through the cabinet body to the interior of the rear cabinet, and one end of the serpentine pipe close to the base is provided with a water inlet pipe, and the water inlet pipe extending through the cabinet body to the interior of the rear cabinet, the placement plate is provided with a plurality of ventilation holes in a rectangular array, the interior of the installation cavity is provided with an air outlet duct, and one end of the air outlet duct extends to the interior of the cabinet body, An air inlet duct is arranged inside the base, and one end of the air inlet duct extends to the inside of the cabinet.

Preferably, a cabinet door is installed on one side of the cabinet body, and the cabinet door and the cabinet body are rotatably connected with the cabinet body through hinges, the interior of the cabinet door is provided with a second conductive elastic body, and the second conductive elastic body is connected with the cabinet door. Paste the connection.

Preferably, the serpentine tube is fixedly connected to the placing plate, the upper end face of the serpentine tube is in contact with the bottom end of the placing plate, the two sides of the serpentine tube are provided with heat conducting sheets, and the connecting tube is connected to the bottom end of the placing plate. The serpentine pipe is sealed and connected, the water outlet pipe is communicated with the cooling liquid tank, and the water inlet pipe is sealed and connected with the pressurizing pump.

Preferably, the heat-conducting sheet is attached to the serpentine tube, and the heat-conducting sheet is fixedly connected to the placing plate.

Preferably, the cooling liquid tank and the heat dissipation base are fixed by bolts, the heat dissipation fins and the heat dissipation base are welded and connected, and the heat dissipation fins extend to the outside of the rear cabinet.

Preferably, the first electromagnetic shielding plate and the second electromagnetic shielding plate are pasted and connected through a first conductive elastic body, the first electromagnetic shielding plate is fixedly connected to the cabinet, and the second electromagnetic shielding plate is fixedly connected to the cabinet .

Preferably, the hollow cotton is bonded and connected to the first electromagnetic shielding plate and the second electromagnetic shielding plate respectively.

Preferably, a lower electromagnetic absorbing sheet and an upper electromagnetic absorbing sheet are arranged inside the air outlet duct and the air inlet duct, and the lower electromagnetic absorbing sheet and the upper electromagnetic absorbing sheet are spaced apart, and the lower electromagnetic absorbing sheet and the upper electromagnetic absorbing sheet are The spacing between the sheets is forty millimeters, fans are installed at the other ends of the air outlet duct and the air inlet duct, and dust filters are installed at the front ends of the fans.

Preferably, the fan is fixed to the air outlet duct and the air inlet duct by bolts, respectively, and the dust filter screen is connected to the air outlet duct and the air inlet duct through a slot.

Compared with the prior art, the beneficial effects of the present utility model are:

1. In the present invention, a serpentine tube is installed at the bottom of each placing plate, and the serpentine tubes are sealed and connected by connecting pipes. The cooling liquid inside the box is drawn out and enters the inside of the serpentine tube through the water inlet pipe. Since the serpentine tube is attached to the bottom of the placing plate, when the internal components dissipate heat, it is affected by the heat conduction effect, and is transferred to the placing plate. It is transferred from the placement plate to the serpentine tube, and heat exchange occurs between the cooling temperature on the serpentine tube and the placement plate, so as to dissipate heat from the upper working elements, and at the same time, the heat-conducting sheet fixed with the placement plate is attached to the serpentine tube. On both sides, the heat transfer area is further increased, so that the heat dissipation effect is further improved. Through this cooling method, the shielded cabinet is dissipated. In the process of heat exchange, only the water inlet pipe and the water outlet pipe are connected to the outside, which greatly reduces the space for contact with the outside world and guarantees the internal shielding effect.

2. In the present invention, a heat dissipation seat is arranged at the rear end of the cooling liquid tank, and the heat dissipation seat is fitted with the cooling liquid tank. When working, the heat dissipation seat can absorb the heat inside the cooling liquid tank, and the heat dissipation seat can absorb the heat inside the cooling liquid tank, and pass the heat dissipation seat at one end of the cooling liquid tank. Equipped with heat dissipation fins, the heat dissipation fins extend to the outside of the rear cabinet to further dissipate the heat stored on the heat dissipation seat, so as to cool the coolant in the coolant tank and ensure efficient and fast heat dissipation inside the cabinet. , Through the setting of the heat dissipation seat and the heat dissipation fin, the setting of the cooling device is reduced, and the energy loss is reduced while ensuring timely heat dissipation.

3. In the present invention, a first electromagnetic shielding plate and a second electromagnetic shielding plate are respectively arranged inside the cabinet, the first electromagnetic shielding plate is the side plate, and the second electromagnetic shielding plate is the upper and lower plates. During the connection, non-conductive gaps are easily formed at the joints of different parts, resulting in the phenomenon of electromagnetic leakage. By providing a first conductive elastomer at the connection between the first electromagnetic shielding plate and the second electromagnetic shielding plate, the conductive elastomer is mainly composed of polymer. Vinyl chloride resin is mixed with absorbing substances, and hollow plastic wedges are made by casting or blow molding. The wedges are filled with absorbing substances, such as ferrite, graphite, etc., which are high-performance absorbing materials, thereby eliminating non-conductive points. Improve overall shielding performance.

4. In the present invention, hollow cotton is arranged on the inner side of the first electromagnetic shielding plate and the second electromagnetic shielding plate. Since there are several irregular cavities in the hollow cotton, the internal elements and the electromagnetic shielding plate can be blocked, Reduce the magnetic flux through the body of the shielded object.

5. In the present invention, the upper and lower ends of the cabinet are respectively provided with air outlet ducts and air inlet ducts, and the upper and lower electromagnetic absorbing sheets are arranged in the ducts, and the upper and lower electromagnetic absorbing sheets are arranged at a staggered interval. The air is circulated to ensure that the air inside the cabinet and the outside air are in a state of exchange at any time. On the one hand, it avoids the corrosion and humidity phenomenon caused by long-term internal sealing. On the other hand, it can cooperate with the serpentine tube for auxiliary heat dissipation. It can change the air flow of the ventilation duct from a straight line to a curve, and absorb the electromagnetic signal without affecting the ventilation, so as to avoid signal leakage.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present utility model;

Fig. 2 is the overall side view of the utility model;

FIG. 3 is a schematic structural diagram of a placement plate of the present invention;

4 is a perspective view of the structure at the corner of the electromagnetic shielding plate of the present invention;

5 is a schematic diagram of the internal structure of the ventilation duct of the present invention;

FIG. 6 is a partial enlarged view of the A region of the present invention.

In the figure: 1. Cabinet body; 2. Cabinet door; 3. Installation cavity; 4. Base; 5. First electromagnetic shielding plate; 6. Second electromagnetic shielding plate; 7. First conductive elastomer; 8. Hollow cotton ; 9. Placing plate; 10. Water outlet pipe; 11. Coiled pipe; 12. Heat conduction sheet; 13. Ventilation hole; 14. Water inlet pipe; 15. Connecting pipe; 16. Air outlet pipe; 17, Air inlet pipe; 18 , lower electromagnetic absorption sheet; 19, upper electromagnetic absorption sheet; 20, fan; 21, second conductive elastomer; 22, rear cabinet; 23, coolant tank; 24, heat sink; 25, heat dissipation fin; 26, add Pressure pump; 27. Dust filter.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example.

1-6, an embodiment provided by the present invention: a high-performance electromagnetic shielding cabinet, including a cabinet body 1, the upper end of the cabinet body 1 is provided with an installation cavity 3, and the bottom of the installation cavity 3 is provided with a base 4 , both sides of the inner wall of the cabinet body 1 are provided with a first electromagnetic shielding plate 5, and the upper and lower ends of the inner wall of the cabinet body 1 are provided with a second electromagnetic shielding plate 6. The first electromagnetic shielding plate 5 and the second electromagnetic shielding plate 6 A first conductive elastic body 7 is provided between the two, the inner walls of the first electromagnetic shielding plate 5 and the second electromagnetic shielding plate 6 are both provided with hollow cotton 8, the rear end of the cabinet 1 is provided with a rear cabinet 22, and the interior of the rear cabinet 22 A cooling liquid tank 23 is provided, the rear end of the cooling liquid tank 23 is provided with a heat dissipation seat 24, one side of the heat dissipation seat 24 is provided with heat dissipation fins 25, a number of heat dissipation fins 25 are provided, and the heat dissipation fins 25 are distributed in sequence, A pressurizing pump 26 is installed on one side of the cooling liquid tank 23, a placing plate 9 is installed inside the cabinet 1, several placing plates 9 are installed, and the placing plates 9 are arranged in sequence, and the bottom of the placing plate 9 is installed with a serpentine shape The pipe 11 and the connecting pipe 15 are installed between the serpentine pipes 11. The end of the serpentine pipe 11 close to the installation cavity 3 is provided with a water outlet pipe 10, and the water outlet pipe 10 extends through the cabinet body 1 to the interior of the rear cabinet 22. One end of the pipe 11 close to the base 4 is provided with a water inlet pipe 14, and the water inlet pipe 14 extends through the cabinet body 1 to the interior of the rear cabinet 22. The placement plate 9 is provided with a plurality of ventilation holes 13 in a rectangular array, and the interior of the installation cavity 3 is provided with There is an air outlet duct 16 , and one end of the air outlet duct 16 extends to the inside of the cabinet 1 , and an air inlet duct 17 is provided inside the base 4 , and one end of the air inlet duct 17 extends to the inside of the cabinet 1 .

Further, a cabinet door 2 is installed on one side of the cabinet body 1, and the cabinet door 2 and the cabinet body 1 are connected by hinge rotation. The interior of the cabinet door 2 is provided with a second conductive elastic body 21, and the second conductive elastic body 21 is connected with the cabinet body 1. The cabinet door 2 is glued and connected. When the cabinet door 2 is closed, the second conductive elastic body 21 is in contact with the cabinet body 1, thereby reducing the gap when closing, eliminating non-conductive points, and improving the overall shielding performance.

Further, the serpentine tube 11 is fixedly connected with the placing plate 9, and the upper end surface of the serpentine tube 11 is fitted with the bottom end of the placing plate 9, the two sides of the serpentine tube 11 are provided with thermal conductive sheets 12, and the connecting tube 15 and The serpentine pipe 11 is sealed and connected, the water outlet pipe 10 is connected with the cooling liquid tank 23, and the water inlet pipe 14 is sealed with the pressurized pump 26. On the one hand, the serpentine pipe 11 placed at the bottom of the plate 9 can efficiently dissipate heat to the upper components, and the other On the one hand, in the process of heat exchange, only the water inlet pipe 14 and the water outlet pipe 10 are communicated to the outside, which greatly reduces the space for contact with the outside world and ensures the internal shielding effect.

Further, the thermally conductive sheet 12 is attached to the serpentine tube 11, and the thermally conductive sheet 12 is fixedly connected to the placing plate 9, and the thermally conductive sheet 12 fixed to the placing plate 9 is attached to both sides of the serpentine tube 11, further increasing the The heat transfer area further improves the heat dissipation effect.

Further, the cooling liquid tank 23 and the heat dissipation base 24 are fixed by bolts, the heat dissipation fins 25 are welded to the heat dissipation base 24 , and the heat dissipation fins 25 extend to the outside of the rear cabinet 22 , and the heat dissipation base 24 can dissipate the heat inside the cooling liquid tank 23 . The heat dissipation fins 25 are provided at one end of the heat dissipation base 24 , and the heat dissipation fins 25 extend to the outside of the rear cabinet 22 to further dissipate the heat stored on the heat dissipation base 24 .

Further, the first electromagnetic shielding plate 5 and the second electromagnetic shielding plate 6 are pasted and connected through the first conductive elastic body 7 , the first electromagnetic shielding plate 5 is fixedly connected to the cabinet body 1 , and the second electromagnetic shielding plate 6 is fixedly connected to the cabinet body 1 , The conductive elastomer is mainly composed of polyvinyl chloride resin mixed with absorbing substances, and hollow plastic wedges are made by casting or blow molding. The wedges are filled with absorbing substances, such as ferrite, graphite, etc. , thereby eliminating non-conductive spots and improving the overall shielding performance.

Further, the hollow cotton 8 is attached to the first electromagnetic shielding plate 5 and the second electromagnetic shielding plate 6 respectively. Since there are several irregular cavities inside the hollow cotton 8, the internal components and the electromagnetic shielding plate can be blocked, reducing the Magnetic flux through the body of the shielded object.

Further, the inside of the air outlet duct 16 and the air inlet duct 17 are provided with a lower electromagnetic absorption sheet 18 and an upper electromagnetic absorption sheet 19, and the lower electromagnetic absorption sheet 18 and the upper electromagnetic absorption sheet 19 are spaced apart, and the lower electromagnetic absorption sheet 18 and the upper electromagnetic absorption sheet. The distance between the electromagnetic absorption sheets 19 is forty millimeters. Fans 20 are installed at the other ends of the air outlet duct 16 and the air inlet duct 17. The front ends of the fans 20 are provided with dust filters 27. The distribution of the electromagnetic absorption sheets can make the The airflow of the ventilation duct changes from a straight line to a curved line, and the electromagnetic signal is absorbed without affecting the ventilation, so as to avoid signal leakage.

Further, the fan 20 is respectively fixed with the air outlet duct 16 and the air inlet duct 17 by bolts, and the dust filter screen 27 is respectively connected with the air outlet duct 16 and the air inlet duct 17 through the slot. By starting the fan 20, the air inside the cabinet 1 is circulated. , so as to ensure that the air inside the cabinet 1 and the outside air are in a state of being exchanged at any time, and at the same time, the setting of the dust filter screen 27 can prevent the entry of dust.

Working principle: When in use, by starting the pressurizing pump 26, the pressurizing pump 26 draws out the coolant inside the coolant tank 23, and enters the inside of the serpentine tube 11 through the water inlet pipe 14. The bottoms are fitted together, and while the internal components emit heat, they are affected by the heat conduction effect and are transferred to the placement plate 9, and then transferred from the placement plate 9 to the serpentine tube 11. The cooling temperature on the serpentine tube 11 is the same as that of the placement plate 9. Heat exchange occurs between the two sides, so as to dissipate heat from the upper working elements, and at the same time, the heat-conducting sheet 12 fixed with the placing plate 9 is attached to both sides of the serpentine tube 11, which further increases the heat transfer area and further improves the heat dissipation effect. During the heat dissipation process, the heat dissipation seat 24 can absorb the heat inside the cooling liquid tank 23, and the heat dissipation fins 25 are provided at one end of the heat dissipation seat 24, and the heat dissipation fins 25 extend to the outside of the rear cabinet 22 to further dissipate the heat dissipation seat. The heat stored on 24 is exported, so as to cool the cooling liquid in the cooling liquid tank 23 to ensure efficient and rapid heat dissipation inside the cabinet 1. During the heat exchange process, only the water inlet pipe 14 is communicated with the water outlet pipe 10. To the outside, the space for contact with the outside world is greatly reduced, and the internal shielding effect is guaranteed. It is a side plate, the second electromagnetic shielding plate 6 is an upper and lower plate, and a first conductive elastic body 7 is provided at the connection between the first electromagnetic shielding plate 5 and the second electromagnetic shielding plate 6, and the conductive elastic body is mainly composed of polyvinyl chloride resin. Mixed with absorbing substances, hollow plastic wedges are made by casting or blow molding, and the wedges are filled with absorbing substances, such as ferrite, graphite, etc., which are high-performance absorbing materials, thereby eliminating non-conductive points and improving the overall For shielding performance, hollow cotton 8 is provided on the inner side of the first electromagnetic shielding plate 5 and the second electromagnetic shielding plate 6. Since there are several irregular cavities inside the hollow cotton 8, the internal components and the electromagnetic shielding plate can be blocked. In addition, the upper and lower ends of the cabinet 1 are respectively provided with an air outlet duct 16 and an air inlet duct 17, and the upper and lower electromagnetic absorption sheets 19 and the lower The electromagnetic absorption sheet 18, by starting the fan 20, circulates the air inside the cabinet 1, so as to ensure that the internal air and the external air of the cabinet 1 are in a state of being exchanged at any time, and the distribution of the electromagnetic absorption sheet can make the airflow of the ventilation duct from a straight line. It becomes a curve and absorbs electromagnetic signals without affecting ventilation, so as to avoid signal leakage.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention may be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes within the meaning and range of the required equivalents are embraced within the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (9)

1. A high-performance electromagnetic shielding cabinet, comprising a cabinet body (1), characterized in that: an installation cavity (3) is arranged on the upper end of the cabinet body (1), and a base is arranged below the installation cavity (3) (4), both sides of the inner wall of the cabinet body (1) are provided with first electromagnetic shielding plates (5), and the upper and lower ends of the inner wall of the cabinet body (1) are provided with second electromagnetic shielding plates (6) A first conductive elastic body (7) is arranged between the first electromagnetic shielding plate (5) and the second electromagnetic shielding plate (6), and the first electromagnetic shielding plate (5) and the second electromagnetic shielding plate The inner wall of (6) is provided with hollow cotton (8), the rear end of the cabinet body (1) is provided with a rear cabinet (22), and the interior of the rear cabinet (22) is provided with a cooling liquid tank (23), The rear end of the cooling liquid tank (23) is provided with a heat dissipation seat (24), one side of the heat dissipation seat (24) is provided with heat dissipation fins (25), and a plurality of heat dissipation fins (25) are provided, and The cooling fins (25) are distributed in sequence, a pressurizing pump (26) is installed on one side of the cooling liquid tank (23), a placing plate (9) is installed inside the cabinet (1), and the placing plate (9) ) is installed with several, and the placing plates (9) are distributed in sequence, the bottom of the placing plate (9) is installed with serpentine tubes (11), and connecting pipes (15) are installed between the serpentine tubes (11). ), the end of the serpentine pipe (11) close to the installation cavity (3) is provided with a water outlet pipe (10), and the water outlet pipe (10) extends through the cabinet (1) to the interior of the rear cabinet (22), so One end of the serpentine pipe (11) close to the base (4) is provided with a water inlet pipe (14), and the water inlet pipe (14) extends through the cabinet body (1) to the interior of the rear cabinet (22). 9) A plurality of ventilation holes (13) are arranged in a rectangular array on the top, an air outlet duct (16) is arranged inside the installation cavity (3), and one end of the air outlet duct (16) extends to the bottom of the cabinet (1). Internally, an air inlet duct (17) is arranged inside the base (4), and one end of the air inlet duct (17) extends to the inside of the cabinet (1). 2 . The high-performance electromagnetic shielding cabinet according to claim 1 , wherein a cabinet door ( 2 ) is installed on one side of the cabinet body ( 1 ), and the cabinet door ( 2 ) is connected to the cabinet body ( 1 ). 3 . ) are connected by hinge rotation, and the inside of the cabinet door (2) is provided with a second conductive elastic body (21), and the second conductive elastic body (21) is attached to the cabinet door (2). 3. A high-performance electromagnetic shielding cabinet according to claim 1, characterized in that: the serpentine tube (11) is fixedly connected to the placing plate (9), and the upper end face of the serpentine tube (11) is connected to the placing plate (9). The bottom ends of the plates (9) are in contact with each other, the two sides of the serpentine tube (11) are provided with thermally conductive sheets (12), and the connecting tube (15) is sealedly connected with the serpentine tube (11). The water outlet pipe (10) is communicated with the cooling liquid tank (23), and the water inlet pipe (14) is sealedly connected with the pressurizing pump (26). 4. A high-performance electromagnetic shielding cabinet according to claim 3, characterized in that: the heat-conducting sheet (12) is attached to the serpentine tube (11), and the heat-conducting sheet (12) is connected to the placing plate (9). ) fixed connection. 5. A high-performance electromagnetic shielding cabinet according to claim 1, characterized in that: the cooling liquid tank (23) and the heat dissipation seat (24) are fixed by bolts, and the heat dissipation fins (25) and the heat dissipation seat are fixed by bolts. (24) Welded connection, and the cooling fins (25) extend to the outside of the rear cabinet (22). 6. A high-performance electromagnetic shielding cabinet according to claim 1, characterized in that: the first electromagnetic shielding plate (5) and the second electromagnetic shielding plate (6) are pasted by a first conductive elastomer (7) The first electromagnetic shielding plate (5) is fixedly connected to the cabinet body (1), and the second electromagnetic shielding plate (6) is fixedly connected to the cabinet body (1). 7 . The high-performance electromagnetic shielding cabinet according to claim 1 , wherein the hollow cotton ( 8 ) is bonded and connected to the first electromagnetic shielding plate ( 5 ) and the second electromagnetic shielding plate ( 6 ) respectively. 8 . 8. A high-performance electromagnetic shielding cabinet according to claim 1, characterized in that: a lower electromagnetic absorption sheet (18) and an upper electromagnetic absorption sheet (18) and an upper electromagnetic absorption sheet (18) and an upper electromagnetic absorption sheet (18) and an upper Electromagnetic absorption sheet (19), and the space between the lower electromagnetic absorption sheet (18) and the upper electromagnetic absorption sheet (19), the distance between the lower electromagnetic absorption sheet (18) and the upper electromagnetic absorption sheet (19) is forty A fan (20) is installed at the other ends of the air outlet duct (16) and the air inlet duct (17), and a dust filter (27) is installed at the front end of the fan (20). 9 . The high-performance electromagnetic shielding cabinet according to claim 8 , wherein the fan ( 20 ) is respectively fixed to the air outlet duct ( 16 ) and the air inlet duct ( 17 ) by bolts, and the dust filter net (27) are respectively connected with the air outlet duct (16) and the air inlet duct (17) through a card slot.

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