Electromagnetic shielding cabinet with efficient heat dissipation

Abstract

The invention discloses a high-efficiency heat dissipation electromagnetic shielding cabinet, which comprises a plurality of case placement racks slidably mounted in a cabinet body, and a cooling mechanism is mounted on the inner side of the cabinet body and located on the outer sides of the case placement racks; a cabinet door is installed on one side of the cabinet body, an automatic piece taking mechanism capable of vertically moving is installed on the inner side of the cabinet door, and one end of the automatic piece taking mechanism can be connected to the case containing frame and drive the case containing frame to move out of the cabinet body. According to the application, the plurality of case placement racks are installed in the electromagnetic shielding cabinet, the cooling mechanisms are installed on the outer sides of the case placement racks for efficient heat dissipation, and the movable and storable automatic pick-up mechanism is arranged on the cabinet door, so that the case placement racks can be conveniently moved out of and in the case, accurate taking out and returning of the server case are realized, and the efficiency of the server is improved. The automation degree is high.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic shielding cabinets, and particularly relates to an electromagnetic shielding cabinet with efficient heat dissipation. Background Art

[0002] With the rapid development of information equipment, electromagnetic shielding cabinets are widely used in scenarios such as data centers and communication base stations to protect internal electronic devices from external electromagnetic interference. Traditional electromagnetic shielding cabinets face two core contradictions in design: one is the balance between electromagnetic shielding performance and heat dissipation efficiency. The airtight shielding structure is prone to heat accumulation; the other is the lack of convenience in equipment maintenance and automation, and the manual operation efficiency is low.

[0003] In the prior art, heat dissipation solutions mostly rely on external fans or simple air duct designs. For example, in the prior patent technology with the patent publication number CN109041565A and the patent name "An Electromagnetic Shielding Cabinet", it is specifically disclosed that "including an electromagnetic shielding cabinet body, the electromagnetic shielding cabinet body is arranged in a hollow cuboid structure, and a first heat dissipation fan is installed on the inner wall of the top end of the electromagnetic shielding cabinet body. The inner walls on both sides of the electromagnetic shielding cabinet body are provided with fixing plates with the same structure at equal intervals, and a placement plate is movably installed on the fixing plates. The bottom end of the electromagnetic shielding cabinet body is connected to a base, and symmetrically arranged connecting rods are connected to the inner walls on both sides of the electromagnetic shielding cabinet body. A second heat dissipation fan is installed between the two connecting rods". The above technology uses two fans arranged up and down to achieve heat dissipation, and cannot accurately dissipate heat for multiple heat sources. The heat dissipation efficiency is limited by the airtightness of the shielding structure and cannot be dynamically adjusted according to the device state. In addition, the maintenance of equipment in the cabinet usually requires manually pulling out the placement rack, which is cumbersome to operate and lacks a safety locking mechanism. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: how to provide an electromagnetic shielding cabinet with efficient heat dissipation and convenient operation.

[0005] To solve the above technical problem, the present invention provides the following technical solutions:

[0006] An electromagnetic shielding cabinet with efficient heat dissipation includes a plurality of chassis placement racks slidably installed inside the cabinet body, and a cooling mechanism is installed inside the cabinet body and outside the chassis placement racks.

[0007] A cabinet door is installed on one side of the cabinet body, and an automatic pick-up mechanism capable of vertical movement is installed on the inner side of the cabinet door. One end of the automatic pick-up mechanism can be connected to the chassis placement rack and drive the chassis placement rack to move out of the cabinet body.

[0008] In this application, several chassis placement racks are installed inside the electromagnetic shielding cabinet, a cooling mechanism is installed on the outside of the chassis placement rack for efficient heat dissipation, and a movable and retractable automatic pick-up mechanism is set on the cabinet door, which facilitates the removal and insertion of the chassis placement rack from and into the chassis, realizing the precise extraction and return of the server chassis, with a high degree of automation.

[0009] As a further solution of the present invention: The automatic pick-up mechanism includes a pick-up manipulator and a telescopic rod installed thereon. A driving gear is provided at the end of the telescopic rod, and a rack corresponding to the driving gear is installed on one side of the chassis placement rack;

[0010] A positioning component capable of contacting the inner pressure block of the telescopic rod is provided on the inner wall of the cabinet body and outside the rack.

[0011] As a further solution of the present invention: The positioning component includes a push-type bolt and a wedge block. The wedge block is installed on the inner wall of the cabinet body, and a push-type bolt capable of contacting the chassis placement rack is installed on one side of the wedge block; The telescopic rod can drive the pressure block to move between the wedge block and the chassis placement rack.

[0012] As a further solution of the present invention: The pick-up manipulator includes a pick-up plate, and a slot for the pick-up plate is reserved on the chassis placement rack; One side of the pick-up plate is rotatably connected to a lifting plate through an opening and closing controller, and the lifting plate is installed on a linear drive component provided on the cabinet door.

[0013] As a further solution of the present invention: A lifting driver is installed on the linear drive component, and the output end of the linear drive component is connected to the lifting plate.

[0014] As a further solution of the present invention: The cooling mechanism includes a plurality of blowers and a return air box installed on the inner wall of the cabinet body and on both sides of the chassis placement rack, and an air box installed inside the cabinet body. The plurality of blowers, the return air box are communicated with the air box, and both ends of the air box are connected to the air inlet and the air outlet on the cabinet body.

[0015] As a further solution of the present invention: One end of the plurality of blowers is connected to a refrigeration cartridge through an air inlet pipe, the refrigeration cartridge is connected to the air box through a pipe, and a fan is installed on the pipeline between the refrigeration cartridge and the air box.

[0016] As a further solution of the present invention: One end of the return air box is connected to a second fan through an air outlet pipe, and the second fan is connected to the air box through a pipeline.

[0017] As a further solution of the present invention: A waveguide window is provided at the end of the air box connected to the air outlet, and an opening and closing mechanism for controlling the air outlet is provided on the waveguide window.

[0018] As a further solution of the present invention: The opening and closing mechanism includes a rotating table, a shutter, and a guide frame. The rotating table is rotatably connected to the guide frame. A polygonal chute is provided on one end face of the rotating table. There are several shutters. A rectangular slider is fixedly provided on one end face of each shutter. The rectangular slider is slidably engaged with one side of the polygonal chute. A slide bar is fixedly provided on the other end face of each shutter, and a chute for slidably engaging with the slide bar is provided on the guide frame.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. In this application, through the corresponding layout of the blower and the return air box, combined with the heat dissipation fins at the lower end of the placement rack, a directional air-cooling system is formed, effectively improving the heat dissipation efficiency. At the same time, the cabinet adopts a U-shaped air inlet channel and an interleaved metal plate design, which not only ensures the electromagnetic shielding performance but also dynamically adjusts the outlet size through the opening and closing mechanism of the waveguide window to achieve a balance between efficient air flow passage and shielding performance. In addition, the dry ice particles in the refrigeration cartridge are linked with the rotating blades in the air inlet duct to release cold air when the air flows, further enhancing the heat dissipation effect.

[0021] 2. In this application, through the precise positioning of the grating displacement sensor and the linear actuator of the pick-up manipulator, combined with the rack and pinion transmission and the fixed stroke control of the lifting actuator, the automatic extraction and return of the server chassis are realized, significantly reducing manual operation. The linkage design of the placement rack and the blower (such as the cooperation between the wind deflector and the lever) can automatically close the corresponding nozzles when the device is removed, avoiding ineffective heat dissipation. After the device returns to its position, the nozzles resume ventilation, dynamically matching the heat dissipation requirements. This design not only improves the maintenance efficiency but also reduces energy consumption through intelligent control and extends the service life of the device.

[0022] 3. In this application, the push-type bolt on the track cooperates with the insertion hole of the placement rack to lock the position of the placement rack in the non-operating state, preventing accidental sliding out. The linkage design of the pressure block on the telescopic rod and the wedge block of the bolt automatically unlocks the bolt only when the manipulator operates, ensuring the stability of the device operation. At the same time, the matching structure of the pick-up fork and the slot of the placement rack enables the server chassis to smoothly disengage when lifted, preventing interference between the pick-up fork and the placement rack. Brief Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the electromagnetic shielding cabinet with efficient heat dissipation according to the embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the bottom view of the electromagnetic shielding cabinet with efficient heat dissipation according to the embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the cabinet door and the pick-up manipulator according to the embodiment of the present invention;

[0026] Figure 4 ForFigure 3 Enlarged view of area A in

[0027] Figure 5 Schematic diagram of another perspective of the cabinet door and the automatic picking mechanism in an embodiment of the present invention;

[0028] Figure 6 Schematic diagram of the internal structure of the cabinet body in an embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the internal structure of the cabinet body and the automatic picking mechanism in an embodiment of the present invention;

[0030] Figure 8 Schematic diagram of the structure of the chassis placement rack, the blower, and the return air box in an embodiment of the present invention;

[0031] Figure 9 Is Figure 8 Enlarged view of area B in

[0032] Figure 10 Is Figure 8 Enlarged view of area C in

[0033] Figure 11 Schematic diagram of another perspective of the chassis placement rack, the blower, and the return air box in an embodiment of the present invention;

[0034] Figure 12 Schematic diagram of the structure of the air box in an embodiment of the present invention;

[0035] Figure 13 Schematic diagram of the internal structure of the air box in an embodiment of the present invention;

[0036] Figure 14 Schematic diagram of the structure of the opening and closing mechanism in an embodiment of the present invention;

[0037] Figure 15 Exploded schematic diagram of the structure of the opening and closing mechanism in an embodiment of the present invention;

[0038] Figure 16 Cross-sectional view of the refrigeration cartridge in an embodiment of the present invention;

[0039] Explanation of reference numerals:

[0040] 1. Cabinet body; 11. Rail; 12. Press-type bolt; 13. Wedge block; 14. Pressure block; 15. Air inlet channel; 16. Metal plate; 17. Air box;

[0041] 2. Cabinet door; 21. Vertical guide rail; 22. Picking manipulator; 23. Slide table; 24. Picking plate; 25. Linear actuator; 26. Opening and closing controller; 27. Telescopic rod; 28. Picking fork; 29. Driving gear; 210. Lifting plate; 211. Lifting actuator;

[0042] 3. Server chassis;

[0043] 4. Chassis placement rack; 41. Heat dissipation fins; 42. Rack; 43. Slot; 44. Jack; 45. Lever;

[0044] 5. Blower; 51. Installation housing; 52. Nozzle; 53. Windshield; 54. Through hole; 55. Arc guide block; 56. Return spring; 57. Waveguide window; 58. Fan; 59. Return air box;

[0045] 6. Opening and closing mechanism; 61. Rotating table; 62. Shutter; 63. Guide frame; 64. Polygonal chute; 65. Rectangular slider; 66. Slide bar; 67. Chute; 68. Rotating drive;

[0046] 7. Grating displacement sensor;

[0047] 8. Refrigerant cartridge; 81. Rotating blade. Detailed implementation manners

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0049] Refer to Figure 1 and Figure 2 , an electromagnetic shielding cabinet with efficient heat dissipation, including a cabinet body 1, a cabinet door 2 is arranged at the front end of the cabinet body 1, both the cabinet body 1 and the cabinet door 2 are made of electromagnetic shielding materials, and a plurality of chassis placement racks 4 for placing server chassis 3 are arranged in the cabinet body 1 from top to bottom. When the cabinet door is closed, an electromagnetic shielding space is formed inside the cabinet body 1.

[0050] Tracks 11 are respectively arranged on both sides of the cabinet body 1, the chassis placement rack 4 is slidably arranged on the tracks 11, and a heat dissipation fin 41 is fixedly connected to the lower end of the chassis placement rack 4 (refer to Figure 6 ); by pulling the chassis placement rack 4, the server chassis 3 located on the chassis placement rack 4 can be pulled out, which is convenient for maintenance and replacement.

[0051] Refer to Figure 2 and Figure 5 , in order to realize the automatic extraction of the server chassis 3, a vertical guide rail 21 (refer to Figure 5 ) and a pick-up manipulator 22 (refer to Figure 2) A driver for automatically opening the cabinet door 2 is provided between the cabinet door 2 and the cabinet body 1. When the cabinet door 2 is in the open state, the included angle with the cabinet body 1 is 90° (as Figure 1 shown), which can be achieved by mechanical limit or an opening drive motor.

[0052] Referring to Figure 5 , the picking manipulator 22 includes a sliding table 23 and a picking plate 24. The sliding table 23 is slidably arranged on the vertical guide rail 21. A linear driver 25 is provided between the sliding table 23 and the cabinet door 2. Preferably, the linear driver 25 uses a servo motor and a lead screw. The sliding table 23 is threadedly connected to the lead screw. By driving the lead screw to rotate with the servo motor, the position of the sliding table 23 is adjusted. A grating displacement sensor 7 is provided between the cabinet door 2 and the sliding table 23. The grating displacement sensor 7 is signal-connected to the linear driver 25. Through the precise positioning of the grating displacement sensor 7, the position of the picking plate 24 can be height-matched with the chassis placement rack 4.

[0053] Referring to Figure 5 , a lifting plate 210 is arranged on the sliding table 23. A lifting driver 211 is provided between the lifting plate 210 and the sliding table 23. The picking plate 24 is hinged to the lifting plate 210. An opening and closing controller 26 is provided between the picking plate 24 and the lifting plate 210. The opening and closing controller 26 can be selected as a motor, that is, the picking plate 24 is driven to rotate relative to the lifting plate 210 by the motor. When the cabinet door is closed, the picking plate 24 can be horizontally stacked on the cabinet door.

[0054] When the server chassis 3 moves above the lifting plate 210, the picking plate 24 and the server chassis 3 are simultaneously lifted by a certain angle through the lifting driver 211 with a fixed stroke, so that the server chassis 3 is separated from the chassis placement rack 4, facilitating the removal of the server chassis 3. Using the lifting driver 211 can avoid frequent starting of the linear driver 25 and improve the service life of the linear driver 25.

[0055] Referring to Figure 3 and Figure 7 , the first picking plate 24 includes a telescopic rod 27 and two picking forks 28 that are relatively fixed. One side of the chassis placement rack 4 is fixedly connected with a rack 42 (refer to Figure 7 ), and a driving gear 29 that cooperates with the rack 42 is arranged on the telescopic rod 27 (refer to Figure 4 ). The output end of the driving gear 29 is connected with a motor, and the rotation of the driving gear 29 is controlled by the motor; when the picking plate 24 is in the unfolded state, the telescopic rod 27 is extended, driving the driving gear 29 to mesh with the rack 42, and the motor drives the driving gear 29 to rotate, thereby driving the rack 42 and the chassis placement rack 4 to move outward.

[0056] Referring to Figure 7, there are two slots 43 provided at the front end of the chassis placement rack 4. When the chassis placement rack 4 is moved out, the pick-up fork 28 is located directly below the slots 43. When the lifting driver 211 controls the pick-up plate 24 to move upward, the pick-up fork 28 moves upward and supports the server chassis 3, causing it to disengage from the chassis placement rack 4. The motor drives the driving gear 29 to move in the reverse direction, causing the chassis placement rack 4 to return to its original position. The linear driver 25 continues to move downward, and the server chassis 3 can be lowered.

[0057] Refer to Figure 8 and Figure 9 , to prevent the abnormal sliding out of the chassis placement rack 4, a push-button bolt 12 is provided on the track 11, and a jack 44 that cooperates with the push-button bolt 12 is provided on the chassis placement rack 4. In the normal state, the push-button bolt 12 is inserted into the jack 44, making the chassis placement rack 4 relatively fixed to the track 11. A wedge block 13 is provided on one side of the push-button bolt 12, and a pressing block 14 that cooperates with the wedge block 13 is provided on the telescopic rod 27 (refer to Figure 4 ). When the telescopic rod 27 extends, it first drives the pressing block 14 to cooperate with the wedge block 13 to unlock the push-button bolt 12.

[0058] Refer to Figure 6 and Figure 7 , several blowers 5 are provided on one side of the cabinet 1, and several return air boxes 59 are provided on the other side of the cabinet 1. The blowers 5 and the return air boxes 59 are in one-to-one correspondence and are arranged corresponding to the chassis placement rack 4. The air blown out by the blowers 5 passes through the server chassis 3 and the heat dissipation fins 41 at the lower end of the chassis placement rack 4 for heat dissipation, and then is discharged through the return air box 59. An air inlet communicating with the blower 5 and an air outlet communicating with the return air box 59 are provided on the cabinet 1. A filter screen is provided at the air inlet to prevent dust from entering.

[0059] Preferably, refer to Figure 11 , the blower 5 includes an installation housing 51 and several nozzles 52 arranged in sequence along the length direction of the installation housing 51. A wind deflector 53 is slidably provided on the installation housing 51, and a through hole 54 adapted to the nozzle of the nozzle 52 is provided on the wind deflector 53. When the through hole 54 on the wind deflector 53 is aligned with the nozzle of the nozzle 52, the air can be blown out normally. When the through hole 54 on the wind deflector 53 is misaligned with the nozzle of the nozzle 52, the air is blocked.

[0060] Refer to Figure 11 , to control the position of the wind deflector 53, an arc-shaped guide block 55 is slidably inserted into the wind deflector 53, and a return spring 56 is provided between the arc-shaped guide block 55 and the wind deflector 53 (refer to Figure 10) A lever 45 is provided on the chassis placement rack 4 and is engaged with the arc-shaped guide block 55. When the chassis placement rack 4 moves outward, the lever 45 moves the arc-shaped guide block 55 outward, causing the through hole 54 to be misaligned with the nozzle of the nozzle 52, preventing ineffective heat dissipation; when the chassis placement rack 4 moves inward, the lever 45 moves the arc-shaped guide block 55 outward, causing the through hole 54 to be aligned with the nozzle of the nozzle 52, enabling the blower 5 to dissipate heat normally.

[0061] Refer to Figure 12 and Figure 13 , to ensure the electromagnetic shielding effect, the cabinet body 1 includes an air box 17, the air inlet and the air outlet are respectively arranged at both ends of the air box 17, an air inlet channel 15 communicated with the air inlet is arranged in the air box 17, and metal plates 16 are arranged in a staggered manner in the air inlet channel 15. The air inlet channel 15 and the metal plates 16 both have electromagnetic shielding effects.

[0062] A waveguide window 57 is arranged at the air outlet (refer to Figure 6 ), and an opening and closing mechanism 6 for controlling the actual working size of the air outlet is arranged on the waveguide window 57 (refer to Figure 13 ). By changing the actual working size of the air outlet, the heat dissipation efficiency can be adjusted.

[0063] Refer to Figure 14 and Figure 15 , the opening and closing mechanism 6 includes a rotating table 61, a shielding plate 62 and a guide frame 63. The rotating table 61 is rotatably connected to the guide frame 63, the guide frame 63 is fixedly connected to the waveguide window 57, and a rotating driver 68 is arranged between the rotating table 61 and the guide frame 63.

[0064] A polygonal chute 64 is arranged on one side end face of the rotating table 61, a plurality of shielding plates 62 are arranged, and a rectangular slider 65 is fixedly arranged on one side end face of each shielding plate 62. The rectangular slider 65 is slidably engaged with one side of the polygonal chute 64; a sliding rod 66 is fixedly arranged on the other side end face of each shielding plate 62, and a chute 67 slidably engaged with the sliding rod 66 is arranged on the guide frame 63. When the rotating table 61 rotates, it drives the shielding plate 62 to move, thereby realizing opening and closing.

[0065] Refer to Figure 16 , to improve the heat dissipation effect, a refrigeration material box 8 is arranged in the cabinet body 1, dry ice particles are arranged in the refrigeration material box 8, a rotating blade 81 is rotatably arranged at the opening of the refrigeration material box 8, the rotating blade 81 is hermetically engaged with the refrigeration material box 8, and when the rotating blade 81 does not rotate, the loss of dry ice particles can be prevented.

[0066] The hair dryer 5 is connected to the air inlet through an air inlet duct. A part of the rotating blade 81 is located inside the air inlet duct. When the air in the air inlet duct flows, it drives the rotating blade 81 to rotate. The cold air enters the air inlet duct from the rotating blade 81 to cool the air. The return air box 59 is connected to the air outlet through an air outlet duct. Independent fans 58 are connected to both the air inlet duct and the air outlet duct.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electromagnetic shielding cabinet with efficient heat dissipation, characterized in that, It includes several chassis placement racks (4) slidably installed inside the cabinet body, and a cooling mechanism is installed on the inner side of the cabinet body and outside the chassis placement rack (4); A cabinet door (2) is installed on one side of the cabinet body, and an automatic picking mechanism capable of vertical movement is installed on the inner side of the cabinet door (2). One end of the automatic picking mechanism can be connected to the chassis placement rack (4) and drive the chassis placement rack (4) to move out of the cabinet body.

2. The electromagnetic shielding cabinet with high-efficiency heat dissipation according to claim 1, wherein: The automatic picking mechanism includes a picking manipulator (22) and a telescopic rod (27) installed thereon. A driving gear (29) is provided at the end of the telescopic rod (27), and a rack (42) corresponding to the driving gear (29) is installed on one side of the chassis placement rack (4); A positioning component capable of contacting the inner pressing block (14) of the telescopic rod (27) is provided on the inner wall of the cabinet body and outside the rack (42).

3. The electromagnetic shielding cabinet with high-efficiency heat dissipation according to claim 2, wherein: The positioning component includes a push-type bolt (12) and a wedge block (13). The wedge block (13) is installed on the inner wall of the cabinet body, and a push-type bolt (12) capable of contacting the chassis placement rack (4) is installed on one side of the wedge block (13); the telescopic rod (27) can drive the pressing block (14) to move between the wedge block (13) and the chassis placement rack (4).

4. The electromagnetic shielding cabinet with high-efficiency heat dissipation according to claim 2, wherein: The picking manipulator (22) includes a picking plate (24), and a slot (43) for the picking plate (24) is reserved on the chassis placement rack (4); One side of the picking plate (24) is rotatably connected to a lifting plate (210) through an opening and closing controller (26), and the lifting plate (210) is installed on a linear driving component provided on the cabinet door (2).

5. The electromagnetic shielding cabinet with high-efficiency heat dissipation according to claim 4, characterized in that: A lifting driver (211) is installed on the linear driving component, and the output end of the linear driving component is connected to the lifting plate (210).

6. The electromagnetic shielding cabinet with efficient heat dissipation according to claim 1, wherein: The cooling mechanism includes several blowers (5) and a return air box (59) installed on the inner wall of the cabinet body and on both sides of the chassis placement rack (4), and an air box (17) installed inside the cabinet body. The several blowers (5), the return air box (59) and the air box (17) are communicated, and both ends of the air box (17) are connected to the air inlet and the air outlet on the cabinet body.

7. An electromagnetic shielding cabinet with efficient heat dissipation according to claim 6, characterized in that: One end of the several blowers (5) is connected to a refrigeration material box (8) through an air inlet pipe, the refrigeration material box (8) is connected to the air box (17) through a pipe, and a fan (58) is installed on the pipeline between the refrigeration material box (8) and the air box (17).

8. An electromagnetic shielding cabinet with efficient heat dissipation according to claim 6, characterized in that: One end of the return air box (59) is connected to a second fan through an air outlet pipe, and the second fan is connected to the air box (17) through a pipeline.

9. An electromagnetic shielding cabinet with efficient heat dissipation according to claim 6, characterized in that: A waveguide window (57) is provided at the end of the air box (17) connected to the air outlet, and an opening and closing mechanism (6) for controlling the air outlet is provided on the waveguide window (57).

10. An electromagnetic shielding cabinet with efficient heat dissipation according to claim 9, characterized in that: The opening and closing mechanism (6) includes a rotating table (61), a shielding plate (62) and a guiding frame (63). The rotating table (61) is rotatably connected to the guiding frame (63). A polygonal chute (64) is provided on one side end face of the rotating table (61). Several shielding plates (62) are provided. A rectangular slider (65) is fixedly provided on one side end face of each shielding plate (62), and the rectangular slider (65) is slidably matched with one side of the polygonal chute (64); A slide bar (66) is fixedly arranged on the end surface on the other side of each shutter (62), and a chute (67) which is slidably matched with the slide bar (66) is arranged on the guide frame (63).

Images