CN210928483U

CN210928483U - High-performance electromagnetic shielding cabinet

Info

Publication number: CN210928483U
Application number: CN201922043070.6U
Authority: CN
Inventors: 顾明明
Original assignee: Suzhou Jiasheng Technology Telecommunications Co ltd
Current assignee: Suzhou Jiasheng Technology Telecommunications Co ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-07-03
Anticipated expiration: 2029-11-25

Abstract

The utility model discloses a high performance electromagnetic shield rack relates to rack technical field, for solving the problem of comparatively contradicting between current high-efficient heat dissipation and the whole electromagnetic shield. The upper end of the cabinet body is provided with the installation cavity, the below of installation cavity is provided with the base, all be provided with first electrically conductive elastomer between first electromagnetic shield board and the second electromagnetic shield board, the inner wall of first electromagnetic shield board and second electromagnetic shield board all is provided with hollow cotton, the inside of back cabinet is provided with the coolant liquid case, the rear end of coolant liquid case is provided with the radiating seat the internally mounted of the cabinet body has places the board, the coiled pipe is all installed to the bottom of placing the board, the one end that the coiled pipe is close to the installation cavity is provided with the outlet pipe, the one end that the coiled pipe is close to the base is provided with the inlet tube, it is provided with a plurality of air vents to place on the board to be the rectangle array, the inside of installation cavity is provided with out the tuber pipe way.

Description

High-performance electromagnetic shielding cabinet

Technical Field

The utility model relates to a rack technical field specifically is a high performance electromagnetic shield rack.

Background

With the gradual deepening of people's understanding of the harmfulness of electromagnetic leakage emission of a confidential information system, a large number of various electromagnetic leakage emission prevention means are adopted when a confidential information network is established, including the construction of an electromagnetic shielding room, the laying of an optical cable and a shielded twisted pair, the use of low-radiation equipment, a red-black power isolation socket and a shielding cabinet, wherein the shielding cabinet has the characteristics of small volume, convenient installation and flexible use, and is very suitable for being used in occasions where the installation of the electromagnetic shielding room is not suitable and the protection of information equipment is required.

However, in order to meet the requirement of heat dissipation of internal elements, the conventional electromagnetic shielding cabinet needs to be provided with a heat dissipation mechanism, and the contradiction between efficient heat dissipation and strong electromagnetic shielding is relatively high, so that the problem that the overall electromagnetic shielding effect is poor is inevitably caused on the premise of meeting the efficient heat dissipation, and therefore the conventional requirement is not met, and a high-performance electromagnetic shielding cabinet is provided.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high performance electromagnetic shield rack to solve the problem of comparatively contradicting between the high-efficient heat dissipation that proposes and the whole electromagnetic shield in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a high-performance electromagnetic shielding cabinet comprises a cabinet body, wherein an installation cavity is arranged at the upper end of the cabinet body, a base is arranged below the installation cavity, first electromagnetic shielding plates are arranged on two sides of the inner wall of the cabinet body, second electromagnetic shielding plates are arranged on the upper end and the lower end of the inner wall of the cabinet body, a first conductive elastic body is arranged between each first electromagnetic shielding plate and each second electromagnetic shielding plate, hollow cotton is arranged on the inner walls of the first electromagnetic shielding plates and the second electromagnetic shielding plates, a rear cabinet is arranged at the rear end of the cabinet body, a cooling liquid box is arranged in the rear cabinet, a heat dissipation seat is arranged at the rear end of the cooling liquid box, heat dissipation fins are arranged on one side of the heat dissipation seat and are distributed in sequence, a pressure pump is arranged on one side of the cooling liquid box, a placing plate is arranged in the cabinet body, place the board and install a plurality of, and place the board and distribute in proper order, place the bottom of board and all install the coiled pipe, install the connecting pipe between the coiled pipe, the one end that the coiled pipe is close to the installation cavity is provided with the outlet pipe, and the outlet pipe passes the inside that the cabinet body extends to the back cabinet, the one end that the coiled pipe is close to the base is provided with the inlet tube, and the inlet tube passes the inside that the cabinet body extends to the back cabinet, it is provided with a plurality of air vents to place to be the rectangular array on the board, the inside of installation cavity is provided with out the tuber pipe way, and the one end that goes out the tuber pipe way extends to the inside of the cabinet body, the inside of base is provided.

Preferably, a cabinet door is installed to one side of the cabinet body, and the cabinet door is connected through hinge rotation with the cabinet body, the inside of cabinet door all is provided with the electrically conductive elastomer of second, and the electrically conductive elastomer of second is pasted with the cabinet door and is connected.

Preferably, the coiled pipe is fixedly connected with the placing plate, the upper end face of the coiled pipe is attached to the bottom end of the placing plate, heat conducting fins are arranged on two sides of the coiled pipe, the connecting pipe is in sealing connection with the coiled pipe, the water outlet pipe is communicated with the cooling liquid tank, and the water inlet pipe is in sealing connection with the pressure pump.

Preferably, the heat conducting fins are attached to the coiled pipe and fixedly connected with the placing plate.

Preferably, the cooling liquid tank and the heat dissipation seat are fixed through bolts, the heat dissipation fins are connected with the heat dissipation seat in a welded mode, 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 connected by sticking through a first conductive elastomer, the first electromagnetic shielding plate is fixedly connected with the cabinet body, and the second electromagnetic shielding plate is fixedly connected with the cabinet body.

Preferably, the hollow cotton is respectively connected with the first electromagnetic shielding plate and the second electromagnetic shielding plate in a sticking manner.

Preferably, the inside of air-out pipeline and intake stack all is provided with down the electromagnetic absorption piece and goes up the electromagnetic absorption piece, and electromagnetic absorption piece and last electromagnetic absorption piece interval part down, the interval between electromagnetic absorption piece and the last electromagnetic absorption piece is forty millimeters down, the fan is all installed with the other end of intake stack to the air-out pipeline, the front end of fan all is provided with the dust filter screen.

Preferably, the fan is fixed with the air outlet pipeline and the air inlet pipeline through bolts respectively, and the dust filter screen is connected with the air outlet pipeline and the air inlet pipeline through clamping grooves respectively.

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

1. the utility model discloses a bottom at every place the board all installs the coiled pipe, pass through connecting pipe sealing connection between the coiled pipe, in the in-process of dispelling the heat, through starting the force (forcing) pump, the force (forcing) pump takes out the coolant liquid of coolant liquid incasement portion, enter into the coiled pipe through the inlet tube inside, because the coiled pipe is laminated with the bottom of placing the board, when internal component gives off heat, be influenced by heat conduction effect, transmit to placing the board, again transmit to the coiled pipe by placing the board, produce heat exchange between the cooling temperature on the coiled pipe and the placing board, thereby dispel the heat to the work component of top, simultaneously with placing the both sides of the fixed conducting strip laminating and coiled pipe of board, further increased heat transfer area, make the radiating effect further promote, dispel the heat to the shielding rack through this kind of cooling method, on the one hand the coiled pipe of placing the board bottom can carry out high-efficient heat dissipation to the top component, on the other hand, in the heat exchange process, only the water inlet pipe and the water outlet pipe are communicated to the outside, so that the space contacting with the outside is greatly reduced, and the internal shielding effect is guaranteed.

2. The utility model discloses a rear end at the coolant liquid case is provided with the radiating seat, the radiating seat is laminated with the coolant liquid case mutually, in operation, the radiating seat can absorb the heat of coolant liquid incasement portion, one end through at the radiating seat is provided with radiating fin, radiating fin extends to the outside of back cabinet, further derive the heat that persists on the radiating seat, thereby cool off the coolant liquid in the coolant liquid case, guarantee that the internal portion of cabinet carries out high-efficient quick radiating work, through the setting of radiating seat and radiating fin, cooling device's setting has been reduced, the loss of energy is reduced when guaranteeing timely radiating.

3. The utility model discloses a be provided with first electromagnetic shield board and second electromagnetic shield board respectively in the inside of the cabinet body, first electromagnetic shield board is the curb plate, second electromagnetic shield board is the lower plate, because in the plate body connection commonly used, the junction of different parts forms the non-conducting gap easily, produce the phenomenon that the electromagnetism was revealed, be provided with first conductive elastomer through the junction at first electromagnetic shield board and second electromagnetic shield board, conductive elastomer mainly mixes the absorbing material by polyvinyl chloride resin, make the hollow plastics wedge with casting or blowing method, pack the absorbing material in the wedge, such as ferrite, graphite etc., a high performance absorbing material, and then eliminate the non-conducting point, improve holistic shielding property.

4. The utility model discloses an inboard at first electromagnetic shield board and second electromagnetic shield board all is provided with hollow cotton, because there are a plurality of irregular cavitys hollow cotton inside, can carry out the separation between internal element and the electromagnetic shield board, reduces through shielding the internal magnetic flow of object.

5. The utility model discloses a be provided with air-out pipeline and intake stack respectively at the upper and lower both ends of the cabinet body, be provided with crisscross interval distribution's last electromagnetic absorption piece and lower electromagnetic absorption piece about being provided with in the pipeline, through starting the fan, the internal portion air of cabinet circulates, thereby guarantee that the internal portion air of cabinet is in the state of exchanging at any time with the outside air, avoid the inside moist phenomenon of corrosion that leads to for a long time on the one hand, on the other hand can cooperate the coiled pipe to carry out supplementary heat dissipation, and the distribution of electromagnetic absorption piece, can become the curve by the straight line with air pipe's air current flow, under the prerequisite that does not influence the ventilation, absorb electromagnetic signal, thereby avoid the signal.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an overall side view of the present invention;

FIG. 3 is a schematic view of the structure of the placing board of the present invention;

FIG. 4 is a perspective view of the structure of the edge of the electromagnetic shielding plate of the present invention;

fig. 5 is a schematic view of the internal structure of the ventilation duct of the present invention;

fig. 6 is a partially enlarged view of the area a of the present invention.

In the figure: 1. a cabinet body; 2. a cabinet door; 3. a mounting cavity; 4. a base; 5. a first electromagnetic shield plate; 6. a second electromagnetic shield plate; 7. a first conductive elastomer; 8. hollow cotton; 9. placing the plate; 10. a water outlet pipe; 11. a serpentine tube; 12. a heat conductive sheet; 13. a vent hole; 14. a water inlet pipe; 15. a connecting pipe; 16. an air outlet pipeline; 17. an air inlet pipeline; 18. a lower electromagnetic absorption sheet; 19. an upper electromagnetic absorption sheet; 20. a fan; 21. a second conductive elastomer; 22. a rear cabinet; 23. a coolant tank; 24. a heat dissipation base; 25. a heat dissipating fin; 26. a pressure pump; 27. and (4) a dust filter screen.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-6, the present invention provides an embodiment: a high-performance electromagnetic shielding cabinet comprises a cabinet body 1, wherein an installation cavity 3 is arranged at the upper end of the cabinet body 1, a base 4 is arranged below the installation cavity 3, first electromagnetic shielding plates 5 are respectively arranged at two sides of the inner wall of the cabinet body 1, second electromagnetic shielding plates 6 are respectively arranged at the upper end and the lower end of the inner wall of the cabinet body 1, a first conductive elastic body 7 is respectively arranged between the first electromagnetic shielding plates 5 and the second electromagnetic shielding plates 6, hollow cotton 8 is respectively arranged at the inner walls of the first electromagnetic shielding plates 5 and the second electromagnetic shielding plates 6, a rear cabinet 22 is arranged at the rear end of the cabinet body 1, a cooling liquid box 23 is arranged inside the rear cabinet 22, a heat dissipation seat 24 is arranged at the rear end of the cooling liquid box 23, heat dissipation fins 25 are arranged at one side of the heat dissipation seat 24, a plurality of heat dissipation fins 25 are arranged, the heat dissipation fins 25 are sequentially distributed, a pressure pump 26 is, place board 9 and install a plurality of, and place board 9 and distribute in proper order, place the bottom of board 9 and all install coiled pipe 11, install connecting pipe 15 between the coiled pipe 11, the one end that coiled pipe 11 is close to installation cavity 3 is provided with outlet pipe 10, and outlet pipe 10 passes the inside that the cabinet body 1 extends to back cabinet 22, the one end that coiled pipe 11 is close to base 4 is provided with inlet tube 14, and inlet tube 14 passes the inside that the cabinet body 1 extends to back cabinet 22, it is provided with a plurality of air vents 13 to place on the board 9 to be the rectangular array, the inside of installation cavity 3 is provided with air-out pipeline 16, and the one end of air-out pipeline 16 extends to the inside of the cabinet body 1, the inside of base 4 is provided with intake stack 17, and the one end of intake stack 17 extends.

Further, cabinet door 2 is installed to one side of the cabinet body 1, and cabinet door 2 passes through the hinge rotation with the cabinet body 1 and is connected, and the inside of cabinet door 2 all is provided with the electrically conductive elastomer 21 of second, and the electrically conductive elastomer 21 of second pastes with cabinet door 2 and is connected, and when cabinet door 2 closed, the electrically conductive elastomer 21 of second contacted with the cabinet body 1, and then can reduce the gap when closing, eliminated the non-conducting point, improved holistic shielding property.

Further, coiled pipe 11 with place board 9 fixed connection, and the up end of coiled pipe 11 and the bottom of placing board 9 are laminated mutually, the both sides of coiled pipe 11 all are provided with conducting strip 12, connecting pipe 15 and coiled pipe 11 sealing connection, outlet pipe 10 is linked together with coolant liquid tank 23, inlet tube 14 and force (forcing) pump 26 sealing connection, the coiled pipe 11 of placing board 9 bottom on the one hand can carry out high-efficient heat dissipation to the top component, on the other hand, at the in-process of heat transfer, only inlet tube 14 communicates to the outside with outlet pipe 10, the space with external contact has greatly been reduced, internal shielding effect is ensured.

Further, conducting

strip

12 and 11 laminating mutually of coiled pipe, and conducting strip 12 with place board 9 fixed connection, with place board 9 both sides of 12 laminating of fixed mutually conducting strip and coiled pipe 11 of board, further increased heat transfer area for the radiating effect further promotes.

Further, coolant liquid case 23 passes through the bolt fastening with radiating seat 24, and radiating fin 25 and radiating seat 24 welded connection, and radiating fin 25 extends to the outside of back cabinet 22, and radiating seat 24 can absorb the inside heat of coolant liquid case 23, is provided with radiating fin 25 through the one end at radiating seat 24, and radiating fin 25 extends to the outside of back cabinet 22, further derives the heat that persists on the radiating seat 24.

Furthermore, first electromagnetic shield 5 and second electromagnetic shield 6 are connected through pasting of first electrically conductive elastomer 7, first electromagnetic shield 5 and cabinet body 1 fixed connection, second electromagnetic shield 6 and cabinet body 1 fixed connection, and electrically conductive elastomer mainly mixes the absorbing substance by polyvinyl chloride resin, makes hollow plastics wedge with casting or blow molding, and the wedge is filled with the absorbing substance, and ferrite, graphite etc. are a high performance absorbing material, and then eliminate the non-conducting point, improve holistic shielding property.

Further, the hollow cotton 8 is respectively connected with the first electromagnetic shielding plate 5 and the second electromagnetic shielding plate 6 in a sticking mode, and due to the fact that a plurality of irregular cavities exist inside the hollow cotton 8, the internal elements and the electromagnetic shielding plates can be isolated, and magnetic flux passing through the inside of a shielded object is reduced.

Further, air-out pipeline 16 and air-supply line 17's inside all is provided with down electromagnetic absorption piece 18 and last electromagnetic absorption piece 19, and electromagnetic absorption piece 18 and last electromagnetic absorption piece 19 interval part down, the interval between lower electromagnetic absorption piece 18 and last electromagnetic absorption piece 19 is forty millimeters, fan 20 is all installed to air-out pipeline 16 and air-supply line 17's the other end, fan 20's front end all is provided with dust filter net 27, the distribution of electromagnetic absorption piece, can become the curve by the straight line with air pipe's air current flow, under the prerequisite that does not influence the ventilation, absorb electromagnetic signal, thereby avoid the signal to leak.

Further, fan 20 passes through the bolt fastening with air-out pipeline 16 and intake stack 17 respectively, and the dust filter net 27 passes through the draw-in groove with air-out pipeline 16 and intake stack 17 respectively and is connected, and through starting fan 20, the inside air of the cabinet body 1 circulates to guarantee that the inside air of the cabinet body 1 is in the state of exchanging at any time with the outside air, the entering of dust can be avoided in the setting of dust filter net 27 simultaneously.

The working principle is as follows: when the heat dissipation device is used, the pressure pump 26 is started, the pressure pump 26 pumps out the cooling liquid in the cooling liquid tank 23, the cooling liquid enters the coiled pipe 11 through the water inlet pipe 14, the coiled pipe 11 is attached to the bottom of the placing plate 9, the internal elements are influenced by a heat conduction effect while radiating heat, the cooling liquid is transmitted to the placing plate 9 and then transmitted to the coiled pipe 11 through the placing plate 9, heat exchange is generated between the cooling temperature on the coiled pipe 11 and the placing plate 9, so that the working elements above are cooled, meanwhile, the heat conduction fins 12 fixed to the placing plate 9 are attached to two sides of the coiled pipe 11, the heat transmission area is further increased, the heat dissipation effect is further improved, in the heat dissipation process, the heat dissipation seat 24 can absorb the heat in the cooling liquid tank 23, the heat dissipation fins 25 are arranged at one end of the heat dissipation seat 24, and the heat dissipation fins 25 extend to the outside of the rear cabinet 22, further, the heat remained on the heat dissipation seat 24 is conducted out, so as to cool the cooling liquid in the cooling liquid tank 23, and ensure the high-efficiency and rapid heat dissipation work inside the cabinet body 1, in the heat exchange process, only the water inlet pipe 14 and the water outlet pipe 10 are communicated to the outside, so that the space contacting with the outside is greatly reduced, the internal shielding effect is ensured, meanwhile, the cabinet body 1 is internally provided with a first electromagnetic shielding plate 5 and a second electromagnetic shielding plate 6 respectively, the first electromagnetic shielding plate 5 is a side plate, the second electromagnetic shielding plate 6 is an upper plate and a lower plate, through arranging a first conductive elastomer 7 at the joint of the first electromagnetic shielding plate 5 and the second electromagnetic shielding plate 6, the conductive elastomer is mainly made of polyvinyl chloride resin doped with absorbing substances, a hollow plastic wedge is made by a casting or blow molding method, the wedge is filled with absorbing substances, such as ferrite, graphite and the like, the inner sides of the first electromagnetic shielding plate 5 and the second electromagnetic shielding plate 6 are both provided with hollow cotton 8, because a plurality of irregular cavities exist in the hollow cotton 8, the internal elements and the electromagnetic shielding plates can be separated, the magnetic flux in the shielded object can be reduced, in addition, the upper end and the lower end of the cabinet body 1 are respectively provided with an air outlet pipeline 16 and an air inlet pipeline 17, the upper electromagnetic absorption sheets 19 and the lower electromagnetic absorption sheets 18 which are vertically staggered and distributed at intervals are arranged in the pipelines, the air in the cabinet body 1 can be circulated by starting a fan 20, thereby ensuring that the air in the cabinet body 1 and the external air are in a state of being exchanged at any time, and the distribution of the electromagnetic absorption sheets can change the air flow of the ventilation pipeline from a straight line to a curve, under the premise of not influencing the ventilation, and the electromagnetic signals are absorbed, so that the signal leakage is avoided.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A high performance electromagnetic shield rack, includes the cabinet body (1), its characterized in that: the cabinet is characterized in that an installation cavity (3) is arranged at the upper end of the cabinet body (1), a base (4) is arranged below the installation cavity (3), first electromagnetic shielding plates (5) are arranged on two sides of the inner wall of the cabinet body (1), second electromagnetic shielding plates (6) are arranged at the upper end and the lower end of the inner wall of the cabinet body (1), a first conductive elastic body (7) is arranged between each first electromagnetic shielding plate (5) and each second electromagnetic shielding plate (6), hollow cotton (8) is arranged on the inner walls of each first electromagnetic shielding plate (5) and each second electromagnetic shielding plate (6), a rear cabinet (22) is arranged at the rear end of the cabinet body (1), a cooling liquid tank (23) is arranged inside the rear cabinet (22), a heat dissipation seat (24) is arranged at the rear end of the cooling liquid tank (23), heat dissipation fins (25) are arranged on one side of the heat dissipation seat (24), the cooling fin (25) is provided with a plurality of cooling fins, the cooling fins (25) are distributed in sequence, a pressure pump (26) is installed on one side of the cooling liquid tank (23), a placing plate (9) is installed inside the cabinet body (1), the placing plate (9) is installed with a plurality of cooling fins, the cooling liquid tank (9) is distributed in sequence, the bottom of the placing plate (9) is provided with a coiled pipe (11), a connecting pipe (15) is installed between the coiled pipes (11), one end, close to the installation cavity (3), of the coiled pipe (11) is provided with a water outlet pipe (10), the water outlet pipe (10) penetrates through the cabinet body (1) and extends to the inside of the rear cabinet (22), one end, close to the base (4), of the coiled pipe (11) is provided with a water inlet pipe (14), the water inlet pipe (14) penetrates through the cabinet body (1) and extends to the inside of the rear cabinet (22), and a plurality of vent holes, the inside of installation cavity (3) is provided with air-out pipeline (16), and the one end of air-out pipeline (16) extends to the inside of the cabinet body (1), the inside of base (4) is provided with intake stack (17), and the one end of intake stack (17) extends to the inside of the cabinet body (1).

2. The high performance electromagnetically shielded cabinet as claimed in claim 1, wherein: the cabinet door is characterized in that a cabinet door (2) is installed on one side of the cabinet body (1), the cabinet door (2) is rotatably connected with the cabinet body (1) through a hinge, a second conductive elastic body (21) is arranged inside the cabinet door (2), and the second conductive elastic body (21) is connected with the cabinet door (2) in a sticking mode.

3. The high performance electromagnetically shielded cabinet as claimed in claim 1, wherein: the utility model discloses a cooling device, including serpentine pipe (11), place board (9), and the up end of serpentine pipe (11) is laminated mutually with the bottom of placing board (9), the both sides of serpentine pipe (11) all are provided with conducting strip (12), connecting pipe (15) and serpentine pipe (11) sealing connection, outlet pipe (10) are linked together with coolant liquid tank (23), inlet tube (14) and force (forcing) pump (26) sealing connection.

4. The high performance electromagnetically shielded cabinet as claimed in claim 3, wherein: the heat conducting fins (12) are attached to the coiled pipe (11), and the heat conducting fins (12) are fixedly connected with the placing plate (9).

5. The high performance electromagnetically shielded cabinet as claimed in claim 1, wherein: the cooling liquid tank (23) is fixed with the heat dissipation seat (24) through bolts, the heat dissipation fins (25) are connected with the heat dissipation seat (24) in a welded mode, and the heat dissipation fins (25) extend to the outside of the rear cabinet (22).

6. The high performance electromagnetically shielded cabinet as claimed in claim 1, wherein: first electromagnetic shield board (5) and second electromagnetic shield board (6) are pasted through first electrically conductive elastomer (7) and are connected, first electromagnetic shield board (5) and the cabinet body (1) fixed connection, second electromagnetic shield board (6) and the cabinet body (1) fixed connection.

7. The high performance electromagnetically shielded cabinet as claimed in claim 1, wherein: the hollow cotton (8) is respectively connected with the first electromagnetic shielding plate (5) and the second electromagnetic shielding plate (6) in a sticking way.

8. The high performance electromagnetically shielded cabinet as claimed in claim 1, wherein: air-out pipeline (16) and air inlet pipeline's (17) inside all is provided with down electromagnetic absorption piece (18) and last electromagnetic absorption piece (19), and electromagnetic absorption piece (18) and last electromagnetic absorption piece (19) interval part down, the interval between lower electromagnetic absorption piece (18) and last electromagnetic absorption piece (19) is forty millimeters, fan (20) are all installed to the other end of air-out pipeline (16) and air inlet pipeline (17), the front end of fan (20) all is provided with dust filter screen (27).

9. The high performance electromagnetically shielded cabinet as claimed in claim 8, wherein: the fan (20) is respectively fixed with the air outlet pipeline (16) and the air inlet pipeline (17) through bolts, and the dust filter screen (27) is respectively connected with the air outlet pipeline (16) and the air inlet pipeline (17) through clamping grooves.