Electromagnetic interference prevention shielding structure of pulse modulator cabinet

Abstract

The invention discloses an anti-electromagnetic interference shielding structure of a pulse modulator cabinet, relates to the technical field of pulse modulator cabinets, and solves the problems that the pulse modulator cabinet in the prior art is poor in anti-electromagnetic interference shielding effect and the heat dissipation effect is reduced due to the fact that a dustproof net of a heat dissipation mechanism is not cleaned in time. Comprising a cabinet body, and a backboard of the cabinet body is provided with heat dissipation ports; the heat dissipation assembly is used for heat dissipation of equipment modules in the cabinet body, and the heat dissipation assembly comprises a heat dissipation pipe fixedly installed in the heat dissipation opening, a heat dissipation fan fixedly connected in the heat dissipation pipe, an electric valve fixedly connected to the side face of the heat dissipation pipe and a dustproof net fixedly connected to the outer side of a port of the electric valve; the device further comprises a shielding assembly. By means of the design, the shielding requirements of high frequency and low frequency can be met at the same time, and the interference problem is effectively avoided by installing the core modules in a partitioned mode. In addition, dust adhering to the dustproof net can be automatically cleaned before each time of use, the heat dissipation effect is ensured, and the problem that manual cleaning is not timely is effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pulse modulator cabinets, and particularly relates to an electromagnetic interference shielding structure of a pulse modulator cabinet. BACKGROUND

[0002] As the physical carrier of the pulse modulation system, the pulse modulator cabinet integrates core modules such as charging power supply, energy storage elements (such as capacitors and inductors), switching devices (such as IGBT, MOSFET or thyratron), pulse forming network (PFN) and control circuit. Its core functions include three aspects: first, energy storage and release, that is, energy is accumulated through energy storage elements and is quickly released under the control of switching devices to form high-voltage and high-current pulse signals; second, signal modulation, which can adjust the amplitude, width and frequency of the pulse according to the input radar control signal and accelerator timing signal to realize information loading; third, electromagnetic compatibility (EMC), which effectively suppresses electromagnetic interference (EMI) generated by high-power pulses to avoid affecting surrounding equipment.

[0003] At present, the existing pulse modulator cabinet has deficiencies in the electromagnetic interference shielding structure. For example, after the core modules are installed in the cabinet, due to the single-layer shielding structure of the cabinet and the differences between the core modules, it is difficult to meet the shielding requirements of high and low frequencies at the same time, which may result in poor electromagnetic shielding effect and further cause interference problems, even affecting the safety of the equipment, and cannot fully meet the shielding effect requirements of different core modules. In addition, there are many core modules inside the cabinet, and a heat dissipation mechanism must be provided. However, in actual use, the dust adhered to the dust screen will gradually reduce the heat dissipation effect, and manual cleaning is often not timely.

[0004] In summary, the existing pulse modulator cabinet has the problems of poor electromagnetic interference shielding effect and reduced heat dissipation effect due to untimely cleaning of the dust screen of the heat dissipation mechanism. SUMMARY

[0005] The present application provides an electromagnetic interference shielding structure of a pulse modulator cabinet, which can solve the problems of poor electromagnetic interference shielding effect and reduced heat dissipation effect due to untimely cleaning of the dust screen of the heat dissipation mechanism in the prior art.

[0006] To achieve the above-mentioned purpose, according to the first aspect of the present application, an electromagnetic interference shielding structure of a pulse modulator cabinet is provided, which comprises a cabinet body, and a back plate of the cabinet body is provided with a heat dissipation opening; a heat dissipation assembly for heat dissipation of equipment modules in the cabinet body, the heat dissipation assembly comprising a heat dissipation pipe fixedly installed in the heat dissipation opening, a heat dissipation fan fixedly connected in the heat dissipation pipe, an electric valve fixedly connected to the side surface of the heat dissipation pipe, and a dust screen fixedly connected to the outside of the port of the electric valve. Also comprising: A shielding assembly for preventing electromagnetic interference, the shielding assembly comprising a mounting plate fixedly installed vertically in the cabinet body, a first assembly frame and a second assembly frame fixedly connected to the mounting plate respectively at the top and bottom, a plurality of assembly compartments uniformly distributed in the first assembly frame and the second assembly frame, and an outer shielding sleeve fixedly arranged on the outer periphery of the first assembly frame and the second assembly frame, and an inner shielding sleeve fixedly installed on the inner wall of the assembly compartment; A cleaning mechanism for automatically removing dust accumulated on the dust screen, the cleaning mechanism comprising an automatic jacking assembly and a cleaning brush structure. The automatic jacking assembly is connected to the cleaning brush structure and the heat dissipation pipe respectively; the cleaning brush structure slides up and down in the vertical direction under the driving of the automatic jacking assembly to clean the dust screen.

[0007] Further improvements are that the automatic jacking assembly comprises a base fixedly connected to the back of the cabinet body, a sealed container fixedly connected to the base, a gas guide pipe fixedly connected to the heat dissipation pipe and having the other end connected to the sealed container, an electric valve fixedly connected to the heat dissipation pipe, and a pair of guide cylinders fixedly arranged on the sealed container and in communication, the guide cylinders are cylindrical, a jacking rod is slidingly arranged in the guide cylinders, a jacking piston is fixedly connected to the jacking rod, the jacking piston is slidingly connected to the guide cylinders, and a sealing ring is arranged between the jacking piston and the guide cylinders.

[0008] Further improvements are that the cleaning brush structure comprises a connecting plate fixedly connected to the pair of jacking rods and a cleaning soft brush detachably fixed to the inner side of the connecting plate, and the cleaning soft brush is detachably connected to the connecting plate through a fixing buckle. The fixing buckle comprises a plurality of sub-buckles fixedly connected to the edge of the inner wall of the connecting plate and a female buckle fixedly connected to the edge of the side of the cleaning soft brush and matched with the sub-buckle.

[0009] Further improvements are that the cleaning mechanism further comprises a control unit, the control unit comprises a frame fixedly sleeved on the outside of the heat dissipation opening and connected through bolts, a pair of elastic touch switches symmetrically fixedly connected to the inner wall of the top surface of the frame, and a microprocessor fixedly connected to the base, the sealed container is provided with an air inlet, the air inlet is fixedly connected with a one-way valve, one end of the gas guide pipe is fixedly connected with the one-way valve, and the other end is in communication with the heat dissipation pipe; the elastic touch switch sends an electric signal to the microprocessor when triggered, and the microprocessor controls the opening of the electric valve according to the received electric signal.

[0010] Further improvements are that the sealed container is filled with inert gas, the inert gas is one of nitrogen and argon, and the jacking rod is provided with a counterweight, when the electric valve is closed, the jacking rod falls under the action of its own weight and the counterweight, so that the cleaning soft brush sweeps the dust screen again, forming double cleaning.

[0011] Further improvement lies in that the shielding assembly further comprises a plurality of magnetic sealing plates for sealing the opening of each assembly compartment, and a magnetic strip one is fixedly installed at the inner side edge of each magnetic sealing plate; a magnetic strip two is fixedly embedded at the side edge of each assembly compartment, and the magnetic strip one and the magnetic strip two are matched to be magnetically attracted for mounting the magnetic sealing plate.

[0012] Further improvement lies in that a rubber clamping frame is fixedly installed at the inner side of each magnetic sealing plate and located inside the magnetic strip one, and the rubber clamping frame is matched to be inserted into the opening of each assembly compartment.

[0013] Further improvement lies in that the mounting plate divides the cabinet body into an equipment area and a cable area, and the mounting plate is provided with a mounting opening at a position corresponding to each assembly compartment.

[0014] Further improvement lies in that the outer shielding sleeve is a conductive metal foil, and the conductive metal foil is one of a copper foil and an aluminum foil; and the inner shielding sleeve is a flexible conductive layer, and the flexible conductive layer is one of a conductive foam and a metal woven mesh.

[0015] Compared with the prior art, the present application has the following beneficial effects: (1) According to the scheme of the present application, the mounting plate is arranged in the cabinet body, and the assembly frame one and the assembly frame two are arranged at the upper side and the lower side of the mounting plate, respectively. The assembly frame one and the assembly frame two are both internally provided with a plurality of assembly compartments. According to the different requirements of the equipment core modules for electromagnetic shielding, the core modules can be classified and mounted in the corresponding assembly compartments, so as to effectively avoid the mutual interference between the core modules. In order to further improve the electromagnetic shielding effect, the assembly frame one and the assembly frame two are wrapped with the outer shielding sleeve, and the inner wall of the assembly compartment is provided with the inner shielding sleeve. The design of the inner and outer double-layer shielding can fully meet the shielding requirements of different core modules for high frequency and low frequency, significantly enhance the electromagnetic shielding effect, prevent the occurrence of interference problems, and have higher flexibility. The scheme can simultaneously meet the shielding requirements of high frequency and low frequency, effectively avoid the interference problem through the partition installation of the core modules, and improve the safety of the equipment.

[0016] (2) In the present invention, the mounting plate also serves to separate the cabinet, dividing it into an equipment area and a cable area. On the mounting plate, mounting openings are provided for each assembly compartment, facilitating the insertion of heat dissipation vents or cable interfaces for each equipment module. In this way, cables are placed in the cable area and connected to the equipment modules, resulting in a neater and more orderly cable layout. Furthermore, magnetic sealing plates are installed at the openings of each assembly compartment. After the core module is installed, the magnetic strip on the inner side of the magnetic sealing plate adheres to the magnetic strip on the side of the assembly compartment, thus securing the magnetic sealing plate. Simultaneously, a rubber clip is secured within the port of the assembly compartment, further enhancing connection stability and preventing the magnetic sealing plate from falling off, greatly facilitating subsequent disassembly, assembly, and maintenance of the core module.

[0017] (3) The present invention achieves positive pressure in the heat dissipation pipe after the cooling fan is started, and hot gas is discharged into a sealed container through a one-way valve. The container is pre-filled with inert gas. When the hot gas enters, the inert gas expands due to heat, causing the air pressure inside the container to rise. As the air pressure rises, the lifting piston and lifting rod are pushed upward, driving the cleaning soft brush to rise synchronously and brush off the dust on the dust filter. This design realizes automatic filter cleaning every time it is used, effectively solving the problem of untimely manual cleaning and significantly reducing the workload of cleaning personnel; in addition, by disassembling and connecting the cleaning soft brush through the fixing buckle, it is convenient for subsequent cleaning personnel.

[0018] (4) In the present invention, when the cleaning brush is lifted to its highest point by the air pressure, its top surface will touch the elastic touch switch. After the elastic touch switch is triggered, it immediately sends an electrical signal to the microprocessor. After receiving the signal, the microprocessor controls the electric valve to open, connects the heat dissipation channel, and discharges the hot gas inside the cabinet to the outside, reducing the internal temperature of the cabinet. During or after the heat dissipation process, the temperature of the sealed container gradually decreases under the natural cooling effect, and the internal air pressure also decreases accordingly. At this time, the cleaning brush structure and the lifting rod fall back under the combined action of their own weight and counterweight. During the fall, the cleaning brush will sweep across the dust screen again, realizing double cleaning and resetting. This design realizes automatic filter cleaning every time it is used, effectively solving the problem of untimely manual cleaning and significantly reducing the workload of cleaning personnel. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the entire device structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the inspection door panel (after removal) on one side of the cabinet of the present invention; Figure 3 This is a schematic diagram of the other side of the entire device of the present invention; Figure 4 This is a schematic diagram of the cleaning brush structure of the present invention; Figure 5 This is a front view schematic diagram of the automatic lifting component and cleaning brush of the present invention. Figure 6 This is a top view of the cabinet structure of the present invention; Figure 7 This is a top view of a single assembly compartment in the assembly frame of the cabinet of the present invention.

[0020] Marked in the image: 1. Cabinet body; 11. Display control panel; 12. Inspection door panel; 13. Heat dissipation pipes; 14. Cooling fan; 15. Dust filter; 16. Electric valve; 2. Cleaning mechanism; 21. Base; 22. Sealed container; 23. Automatic lifting assembly; 231. Guide cylinder; 232. Lifting rod; 233. Lifting piston; 24. Cleaning brush structure; 241. Connecting plate; 242. Cleaning soft brush; 243. Female buckle; 244. Female buckle; 25. Control unit; 251. Frame; 252. Flexible touch switch; 253. Microprocessor; 254. One-way valve; 26. Air guide tube; 3. Shielding components; 31. Mounting plate; 32. Assembly frame one; 33. Assembly frame two; 34. Assembly grid; 341. Outer shielding sleeve; 342. Inner shielding sleeve; 35. Magnetic sealing plate; 36. Magnetic strip one; 37. Magnetic strip two; 38. Rubber clip frame; 301. Equipment area; 302. Cable area; 303. Mounting port. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1 to 7 As shown, an electromagnetic interference shielding structure for a pulse modulator cabinet includes: a cabinet 1, a display control panel 11 on one side of the cabinet 1, and a heat dissipation vent on the back panel of the cabinet 1, which corresponds to the display control panel 11; it should be noted that the cabinet 1 is also equipped with other auxiliary components, which can be installed and debugged during implementation. A heat dissipation assembly is used for heat dissipation of equipment modules inside cabinet 1. The heat dissipation assembly includes a heat dissipation pipe 13 fixedly installed in the heat dissipation port, a heat dissipation fan 14 fixedly connected in the heat dissipation pipe 13, an electric valve 16 fixedly connected to the side of the heat dissipation pipe 13, and a dustproof net 15 fixedly connected to the outside of the port of the electric valve 16. It should be noted that the cooling fan 14 is an adjustable power fan, which can be used in conjunction with the temperature monitoring module pre-set in the cabinet 1. This part will not be described in detail in this embodiment. The shielding component 3 is used to prevent electromagnetic interference. The shielding component 3 includes a mounting plate 31 that is vertically fixedly installed in the cabinet 1. The mounting plate 31 is fixedly connected to the top and bottom of the mounting frame 31, respectively, and the mounting frame 32 and the mounting frame 33 are evenly distributed with a number of assembly grids 34. This part can be classified and installed in the corresponding assembly grids 34 according to the different electromagnetic shielding requirements of the core modules of the equipment, effectively avoiding mutual interference between the core modules. To further enhance the electromagnetic shielding effect, an outer shielding sleeve 341 is fixedly installed on the outer periphery of assembly frame 1 32 and assembly frame 2 33, and an inner shielding sleeve 342 is fixedly installed on the inner wall of assembly grid 34. It should be noted that the outer shielding sleeve 341 is a conductive metal foil, which can be either copper foil or aluminum foil, while the inner shielding sleeve 342 is a flexible conductive layer, which can be either conductive foam or metal braided mesh. The inner shielding sleeve 342 can be installed in different assembly compartments 34, either in each assembly compartment 34 or in specific assembly compartments 34 as needed. This double-layer shielding design can fully meet the high-frequency and low-frequency shielding requirements of different core modules, significantly enhance electromagnetic shielding effectiveness, eliminate interference problems, and provide greater flexibility. In addition, the shielding assembly 3 also includes several magnetic sealing plates 35 for sealing the opening of each assembly compartment 34. A magnetic strip 36 is fixedly installed on the inner edge of each magnetic sealing plate 35, and a magnetic strip 37 is fixedly embedded on the side edge of each assembly compartment 34. The magnetic strips 36 and 37 attract each other to secure the magnetic sealing plate 35. By installing magnetic sealing plates 35 at the opening of each assembly compartment 34, once the core module is installed, the magnetic strip 36 on the inner side of the magnetic sealing plate 35 can attract and adhere to the magnetic strip 37 on the side of the assembly compartment 34, thereby fixing the magnetic sealing plate 35 in place.

[0023] In this embodiment, there is also a preferred implementation scheme. The mounting plate 31 divides the cabinet 1 into an equipment area 301 and a cable area 302. The mounting plate 31 has an installation port 303 at the position corresponding to each assembly compartment 34. The installation port 303 facilitates the insertion of the heat dissipation vent / cable interface of each equipment module. This allows the cables to be placed in the cable area 302 and connected to the equipment modules respectively, making the cables neater. The adjacent two sides are provided with maintenance door panels 12, which can be opened and maintained separately for the core equipment modules and cables, making the operation and use relatively simple.

[0024] In this embodiment, there is also a preferred implementation: a rubber clip 38 is fixedly installed on the inner side of each magnetic sealing plate 35 inside a ring of magnetic strips 36. The rubber clip 38 and the opening of each assembly compartment 34 are engaged and plugged in. After the magnetic strips 36 and 37 are bonded together, the rubber clip 38 is locked in the port of the assembly compartment 34, which further helps to improve the connection stability, prevents the magnetic sealing plate 35 from falling off, and greatly facilitates the subsequent disassembly, assembly and maintenance of the core module.

[0025] This embodiment also provides another implementation scheme, as detailed below: The cleaning mechanism 2 is used to automatically remove dust from the dustproof net 15. The cleaning mechanism 2 includes an automatic lifting component 23 and a cleaning brush structure 24. The automatic lifting component 23 is connected to the cleaning brush structure 24 and the heat dissipation pipe 13 respectively. The cleaning brush structure 24 slides up and down in the vertical direction to clean the dustproof net 15 by being driven by the automatic lifting component 23. The automatic lifting assembly 23 includes a base 21 fixedly connected to the back of the cabinet 1, a sealed container 22 fixedly connected to the base 21, a vent pipe 26 fixedly connected to the heat dissipation pipe 13 and connected at the other end to the sealed container 22, an electric valve 16 fixedly connected to the heat dissipation pipe 13, and a pair of guide cylinders 231 fixedly installed on and connected to the sealed container 22. The guide cylinders 231 are cylindrical, and a lifting rod 232 is slidably installed inside the guide cylinders 231. A lifting piston 233 is fixedly connected to the lifting rod 232 and slidably connected inside the guide cylinders 231. A sealing ring is provided between the lifting piston 233 and the guide cylinders 231 to prevent gas leakage. The sealed container 22 is filled with an inert gas, which is nitrogen or argon. After the heat dissipation fan 14 is started, a positive pressure is formed in the heat dissipation pipe 13, and the hot gas is discharged into the sealed container 22 through the one-way valve 254. The container is pre-filled with inert gas. When hot gas enters, the inert gas expands due to heat, causing the gas pressure inside the container to rise. As the gas pressure increases, the lifting piston 233 and lifting rod 232 are pushed upwards, causing the cleaning brush 242 to rise synchronously and brush off the dust from the dust filter 15. This design achieves automatic filter cleaning every time it is used, effectively solving the problem of untimely manual cleaning and significantly reducing the workload of cleaning personnel. The cleaning mechanism 2 also includes a control unit 25. The control unit 25 includes a frame 251 fixedly fitted outside the heat dissipation vent and connected by bolts, elastic touch switches 252 symmetrically fixedly connected to the inner wall of the top surface of the frame 251, and a microprocessor 253 fixedly connected to the base 21. An air inlet is provided on the sealed container 22, and a one-way valve 254 is fixedly connected to the air inlet. One end of the air guide pipe 26 is fixedly connected to the one-way valve 254, and the other end is connected to the heat dissipation pipe 13. When the elastic touch switch 252 is triggered, it sends an electrical signal to the microprocessor 253. The microprocessor 253 controls the opening of the electric valve 16 according to the received electrical signal. When the cleaning brush 242 rises to its highest point with air pressure, its top surface touches the elastic touch switch 252. After being triggered, the elastic touch switch 252 immediately sends an electrical signal to the microprocessor 253. After receiving the signal, the microprocessor 253 controls the electric valve 16 to open, connecting the heat dissipation channel to exhaust the hot gas inside the cabinet 1 to the outside, thereby reducing the internal temperature of the cabinet 1. The cleaning brush structure 24 includes a connecting plate 241 fixedly connected to a pair of lifting rods 232 and a cleaning soft brush 242 detachably fixed to the inside of the connecting plate 241. The cleaning soft brush 242 is detachably connected to the connecting plate 241 by a fixing buckle. The fixing buckle includes several sub-buckles 243 fixedly connected to the inner edge of the connecting plate 241 and female buckles 244 fixedly connected to the side edge of the cleaning soft brush 242 and engaged with the sub-buckles 243. This makes it easy to assemble and disassemble the cleaning soft brush 242 for easy cleaning.

[0026] In this embodiment, there is also a preferred implementation: the lifting rod 232 has a built-in counterweight to increase its weight. During or after heat dissipation, the temperature of the sealed container 22 gradually decreases under natural cooling, and the internal air pressure also decreases. At this time, the cleaning brush structure 24 and the lifting rod 232 fall back under their own weight and the counterweight. During the fall, the cleaning brush 242 will sweep across the dustproof net 15 again, achieving double cleaning and resetting, thus preparing for the next use.

[0027] In this embodiment, it should also be noted that the electric valve 16, the elastic touch switch 252, the microprocessor 253, and the cooling fan 14 in the application documents are all commercially available products. The circuit control principle of the control unit 25 is existing technology, and its working principle has been disclosed. This embodiment will not elaborate on it.

[0028] Additionally, it should be noted that this application only addresses the shortcomings of existing pulse modulator cabinets, such as poor electromagnetic interference shielding and reduced heat dissipation due to untimely cleaning of the dust filter in the heat dissipation mechanism. It does not address other aspects. The improvement is achieved by employing multi-layer shielding and self-cleaning filters to solve the problems in the background technology. The working principle of this electromagnetic interference shielding structure for a pulse modulator cabinet is described below: In practical use, the solution of this invention involves installing a mounting plate 31 inside the cabinet 1. Assembly frames 32 and 33 are respectively mounted on the upper and lower sides of the mounting plate 31. Both assembly frames 32 and 33 have several assembly compartments 34 inside. This design allows for the classification and installation of core modules into corresponding assembly compartments 34 according to their different electromagnetic shielding requirements, effectively preventing mutual interference between core modules. To further enhance the electromagnetic shielding effect, assembly frames 32 and 33 are surrounded by outer shielding sleeves 341, while the inner walls of the assembly compartments 34 are provided with inner shielding sleeves 342. This double-layer shielding design fully meets the high-frequency and low-frequency shielding requirements of different core modules, significantly enhancing electromagnetic shielding effectiveness, eliminating interference problems, and providing greater flexibility.

[0029] In addition, the mounting plate 31 also serves to separate the cabinet 1, dividing it into an equipment area 301 and a cable area 302. Mounting ports 303 are provided on the mounting plate 31 corresponding to the positions of each assembly compartment 34, facilitating the insertion of heat dissipation vents or cable interfaces for each equipment module. In this way, cables are placed in the cable area 302 and connected to the equipment modules, resulting in a neater and more organized cable layout. Furthermore, magnetic sealing plates 35 are installed at the openings of each assembly compartment 34. After the core module is installed, the magnetic strip 36 on the inner side of the magnetic sealing plate 35 attracts and adheres to the magnetic strip 37 on the side of the assembly compartment 34, thus securing the magnetic sealing plate 35. Simultaneously, rubber clips 38 are secured within the ports of the assembly compartment 34, further enhancing connection stability and preventing the magnetic sealing plates 35 from falling off, greatly facilitating subsequent disassembly, assembly, and maintenance of the core module.

[0030] When the pulse modulator cabinet is put into use, it generates a large amount of heat during operation due to the numerous core modules integrated inside cabinet 1. Therefore, the cabinet uses an adjustable power cooling fan 14 to dissipate heat and meet cooling requirements. After the cooling fan 14 is started, positive pressure is created inside the heat dissipation pipe 13, and hot gas is discharged into the sealed container 22 through the one-way valve 254. This container is pre-filled with inert gas; when the hot gas enters, the inert gas expands due to heat, causing the air pressure inside the container to rise. As the air pressure increases, the lifting piston 233 and lifting rod 232 are pushed upwards, causing the cleaning brush 242 to rise synchronously, brushing off the dust from the dust filter 15. This design achieves automatic filter cleaning each time it is used, effectively solving the problem of untimely manual cleaning and significantly reducing the workload of cleaning personnel; in addition, by detaching and connecting the cleaning brush 242 with a fixing buckle, it is convenient for subsequent cleaning by cleaning personnel.

[0031] When the cleaning brush 242 rises to its highest point with the air pressure, its top surface touches the elastic touch switch 252. Upon activation, the elastic touch switch 252 immediately sends an electrical signal to the microprocessor 253. Upon receiving the signal, the microprocessor 253 controls the electric valve 16 to open, connecting the heat dissipation channel and expelling hot air from the cabinet 1 to the outside, thus lowering the internal temperature of the cabinet 1. During or after heat dissipation, the temperature of the sealed container 22 gradually decreases under natural cooling, and the internal air pressure also decreases accordingly. At this time, the cleaning brush structure 24 and the lifting rod 232 fall back under their own weight and the counterweight. During the fall, the cleaning brush 242 sweeps across the dust filter 15 again, achieving double-pass cleaning and resetting, preparing for the next use.

[0032] This invention not only meets the shielding requirements for both high and low frequencies simultaneously, but also effectively avoids interference issues and improves equipment safety through partitioned installation of core modules. In practical use, this design automatically cleans dust adhering to the dust filter 15, ensuring effective heat dissipation and effectively avoiding the problem of untimely manual cleaning.

Claims

1. An electromagnetic interference shielding structure for a pulse modulator cabinet, comprising a cabinet (1), wherein a heat dissipation vent is provided on the back panel of the cabinet (1); A heat dissipation assembly is used for heat dissipation of equipment modules inside the cabinet (1). The heat dissipation assembly includes a heat dissipation pipe (13) fixedly installed in the heat dissipation port and a heat dissipation fan (14) fixedly connected in the heat dissipation pipe (13), an electric valve (16) fixedly connected to the side of the heat dissipation pipe (13), and a dustproof net (15) fixedly connected to the outside of the port of the electric valve (16). Its features are, Also includes: A shielding component (3) is used to prevent electromagnetic interference. The shielding component (3) includes a mounting plate (31) that is vertically fixedly installed inside the cabinet (1). The mounting plate (31) is fixedly connected to an assembly frame one (32) and an assembly frame two (33) at the top and bottom respectively. Several assembly compartments (34) are evenly distributed inside the assembly frame one (32) and the assembly frame two (33). An outer shielding sleeve (341) is fixedly installed on the outer periphery of the assembly frame one (32) and the assembly frame two (33). An inner shielding sleeve (342) is fixedly installed on the inner wall of the assembly compartment (34). Cleaning mechanism (2) for automatically removing dust from dustproof net (15), the cleaning mechanism (2) includes automatic lifting component (23) and cleaning brush structure (24). The automatic lifting component (23) is connected to the cleaning brush structure (24) and the heat dissipation pipe (13) respectively; the cleaning brush structure (24) slides up and down in the vertical direction to clean the dustproof net (15) by being driven by the automatic lifting component (23).

2. The electromagnetic interference shielding structure for a pulse modulator cabinet according to claim 1, characterized in that, The automatic lifting assembly (23) includes a base (21) fixedly connected to the back of the cabinet (1), a sealed container (22) fixedly connected to the base (21), a vent pipe (26) fixedly connected to the heat dissipation pipe (13) and connected to the sealed container (22) at the other end, an electric valve (16) fixedly connected to the heat dissipation pipe (13), and a pair of guide cylinders (231) fixedly set on the sealed container (22) and connected to each other. The guide cylinder (231) is cylindrical. A lifting rod (232) is slidably arranged inside the guide cylinder (231). A lifting piston (233) is fixedly connected to the lifting rod (232). The lifting piston (233) is slidably connected inside the guide cylinder (231). A sealing ring is provided between the lifting piston (233) and the guide cylinder (231).

3. The electromagnetic interference shielding structure for a pulse modulator cabinet according to claim 2, characterized in that, The cleaning brush structure (24) includes a connecting plate (241) fixedly connected to a pair of lifting rods (232) and a cleaning soft brush (242) detachably fixed to the inside of the connecting plate (241). The cleaning soft brush (242) is detachably connected to the connecting plate (241) by a fixing buckle. The fixing buckle includes several sub-buckles (243) fixedly connected to the inner wall edge of the connecting plate (241) and a female buckle (244) fixedly connected to the side edge of the cleaning soft brush (242) and engaged with the sub-buckles (243).

4. The electromagnetic interference shielding structure for a pulse modulator cabinet according to claim 2, characterized in that, The cleaning mechanism also includes a control unit (25), which includes a frame (251) fixedly sleeved outside the heat dissipation port and connected by bolts, an elastic touch switch (252) symmetrically fixedly connected to the inner wall of the top surface of the frame (251), and a microprocessor (253) fixedly connected to the base (21). The sealed container (22) is provided with an air inlet, and a one-way valve (254) is fixedly connected to the air inlet. One end of the air guide pipe (26) is fixedly connected to the one-way valve (254), and the other end is connected to the heat dissipation pipe (13). When the elastic touch switch (252) is triggered, it sends an electrical signal to the microprocessor (253), and the microprocessor (253) controls the opening of the electric valve (16) according to the received electrical signal.

5. The electromagnetic interference shielding structure for a pulse modulator cabinet according to claim 2, characterized in that, The sealed container (22) is filled with an inert gas, which is either nitrogen or argon. The lifting rod (232) has a built-in counterweight. When the electric valve (16) is closed, the lifting rod (232) falls back under its own weight and the counterweight, so that the cleaning brush (242) sweeps across the dustproof net (15) again, forming a double cleaning process.

6. The electromagnetic interference shielding structure for a pulse modulator cabinet according to claim 1, characterized in that, The shielding assembly (3) also includes several magnetic sealing plates (35) for sealing the opening of each assembly compartment (34). A magnetic strip (36) is fixedly installed on the inner edge of each magnetic sealing plate (35), and a magnetic strip (37) is fixedly embedded on the side edge of each assembly compartment (34). The magnetic strip (36) and the magnetic strip (37) work together to attract each other for installing the magnetic sealing plate (35).

7. The electromagnetic interference shielding structure for a pulse modulator cabinet according to claim 6, characterized in that, The inner side of each magnetic sealing plate (35) is fixedly installed with a rubber clip (38) inside a magnetic strip (36), and the rubber clip (38) and the opening of each assembly compartment (34) are engaged and plugged in.

8. The electromagnetic interference shielding structure for a pulse modulator cabinet according to claim 6, characterized in that, The mounting plate (31) divides the cabinet (1) into an equipment area (301) and a cable area (302). The mounting plate (31) has mounting openings (303) at the positions corresponding to each assembly compartment (34).

9. The electromagnetic interference shielding structure for a pulse modulator cabinet according to claim 1, characterized in that, The outer shielding sleeve (341) is a conductive metal foil, which is either copper foil or aluminum foil. The inner shielding sleeve (342) is a flexible conductive layer, which is either conductive foam or metal braided mesh.

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