A Simplified Structure of Passive Filter for Lightning Protection

Abstract

The invention discloses a simplified lightning protection structure of a passive filter, belonging to the technical field of lightning arresters. The simplified lightning protection structure of the passive filter comprises a cavity, a cover plate is detachably connected to the cavity, an output lightning protection PCB board is arranged on the left side of the cover plate, an output source-isolating non-metallic gasket is arranged on the lower side of the output lightning protection PCB board, the output source-isolating non-metallic gasket is fixed between the cover plate and the interlayer of the output lightning protection PCB board, the output lightning protection PCB board and the output source-isolating non-metallic gasket are detachably connected to the cover plate by a fifth fixing screw, an output inductor winding coil is plugged in the output lightning protection PCB board, and an input lightning protection PCB board is arranged on the left side of the cover plate. The invention solves the drawbacks of high cost, poor versatility and inflexible use of filter series products due to the limitation of external space when designing to meet lightning protection requirements. At the same time, the structure has low processing cost, is easy to batch, is easy to realize, and is flexible to adjust and can be completed in multi-channel coordination.

Description

Technical Field

[0001] The invention relates to the technical field of lightning arresters, and in particular to a simplified lightning protection structure of a passive filter. Background Art

[0002] Lightning arrester is an electrical device used to protect electrical equipment from high transient overvoltage hazards during lightning strikes, and to limit the follow-on time, and often also limit the follow-on amplitude. Lightning arrester is sometimes also called overvoltage protector or overvoltage limiter. In the field of wireless communication, filters, duplexers, multiplexers and other products often have lightning protection requirements to protect the product itself from the hazards of transient voltage and current during lightning strikes, which may cause the product to be unusable. Therefore, lightning protection requirements are added on the premise of meeting the indicators of filters, duplexers, multiplexers and other products;

[0003] Most lightning protection designs currently used integrate all electronic components on a PCB board. This solution cannot be shared and low-cost due to the limitation of the external size, resulting in high product cost, difficult design due to size limitations, low versatility, and lack of flexibility in adjusting multi-channel coordinated operations. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art that the products cannot be shared and low-cost due to the limitation of the external dimensions, resulting in high product cost, difficult design due to the limitation of the design dimensions, and low versatility, and to propose a simplified structure of passive filter lightning protection.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a simplified structure of passive filter lightning protection, comprising: a cavity, a cover plate detachably connected to the cavity, an output end lightning protection PCB board is arranged on the left side of the cover plate, an output end inductor winding coil is plugged into the output end lightning protection PCB board, an input end lightning protection PCB board is arranged on the left side of the cover plate, the input end lightning protection PCB board is arranged on the rear side of the output end lightning protection PCB board, the input end inductor winding coil is plugged into the input end lightning protection PCB board, a common port lightning protection PCB board is arranged on the right side of the cover plate, a common port inductor winding coil is plugged into the common port lightning protection PCB board, and a lightning arrester receiving device is arranged in the middle of the cover plate. The lightning protection PCB board at the receiving end of the lightning arrester is fixedly connected with a pin-type discharge tube, and the other end of the pin-type discharge tube is plugged with a grounding metal sheet of the pin-type discharge tube, and the grounding metal sheet of the pin-type discharge tube is detachably connected to the cover plate through an eighth fixing screw, the lightning protection PCB board at the receiving end of the lightning arrester and the output end inductor winding coil are fixedly connected through the output end lightning arrester connecting cable, the lightning protection PCB board at the receiving end of the lightning arrester and the input end inductor winding coil are fixedly connected through the input end lightning arrester connecting cable, and the lightning protection PCB board at the receiving end of the lightning arrester and the common port inductor winding coil are fixedly connected through the common port lightning arrester connecting cable to achieve a grounding effect.

[0006] Preferably, a first tuning stud is fixedly connected to the left side of the cavity, an output copper sheet is plugged into the other end of the output inductor winding coil, and the output copper sheet and the protrusion on the first tuning stud are detachably connected via a second fixing screw.

[0007] Preferably, an output terminal connector is provided on the left outer wall of the cavity, and the output terminal connector is detachably connected to the cavity through an output terminal fixing screw. There are 4 output terminal fixing screws, and the 4 output terminal fixing screws are evenly distributed at the four corners of the output terminal connector fixing piece. A first protrusion is fixedly connected to the right side of the output terminal connector, and the first protrusion is inserted into the groove on the left side of the output terminal copper sheet.

[0008] Preferably, a second tuning stud is fixedly connected to the left side of the cavity, an input copper sheet is plugged into the other end of the input inductor winding coil, and the input copper sheet and the protrusion on the second tuning stud are detachably connected via a first fixing screw.

[0009] Preferably, an input end connector is provided on the left outer wall of the cavity, and the input end connector is arranged on the rear side of the output end connector. The input end connector is detachably connected to the cavity through the input end fixing screws, and there are 4 input end fixing screws, which are evenly distributed at the four corners of the input end connector fixing part. A second protrusion is fixedly connected to the right side of the input end connector, and the second protrusion is inserted into the groove on the left side of the input copper sheet.

[0010] Preferably, a third tuning stud is fixedly connected to the right side of the cavity, a common port copper sheet is inserted into the other end of the common port inductor winding coil, the common port copper sheet and the convex head on the third tuning stud are detachably connected by a third fixing screw, a common port joint is provided on the outer wall on the right side of the cavity, the common port joint is detachably connected to the cavity by the common port fixing screw, 4 common port fixing screws are provided, and the 4 common port fixing screws are evenly distributed at the four corners of the common port joint fixing piece, a third convex head is fixedly connected to the left side of the common port joint, and the third convex head is inserted into the groove on the right side of the common port copper sheet.

[0011] Preferably, a lightning arrester receiving end lightning protection PCB board is provided with a lightning arrester receiving end source insulating non-metallic gasket on the lower side, and the lightning arrester receiving end source insulating non-metallic gasket is fixed between the cover plate and the lightning arrester receiving end lightning protection PCB board interlayer, and the lightning arrester receiving end lightning protection PCB board and the lightning arrester receiving end source insulating non-metallic gasket are detachably connected to the cover plate by a seventh fixing screw.

[0012] Preferably, an output-end lightning protection PCB board is provided with an output-end source-isolating non-metallic gasket on the lower side, and the output-end source-isolating non-metallic gasket is fixed between the cover plate and the output-end lightning protection PCB board interlayer, and the output-end lightning protection PCB board and the output-end source-isolating non-metallic gasket are detachably connected to the cover plate by a fifth fixing screw.

[0013] Preferably, an input-end source-isolating non-metallic gasket is provided on the lower side of the input-end lightning protection PCB board, and the input-end source-isolating non-metallic gasket is fixed between the cover plate and the input-end lightning protection PCB board interlayer, and the input-end lightning protection PCB board and the input-end source-isolating non-metallic gasket are detachably connected to the cover plate by a fourth fixing screw.

[0014] Preferably, a common port lightning protection PCB board is provided with a common port insulation non-metallic gasket on the lower side, and the common port insulation non-metallic gasket is fixed between the cover plate and the common port lightning protection PCB board interlayer, and the common port lightning protection PCB board and the common port insulation non-metallic gasket are detachably connected to the cover plate by a sixth fixing screw.

[0015] Compared with the prior art, the present invention provides a simplified structure of passive filter lightning protection, which has the following beneficial effects:

[0016] 1. The passive filter has a simplified lightning protection structure, which solves the drawbacks of high cost, poor versatility and inflexible use of filter series products due to the limitation of appearance and space when designing for lightning protection requirements. At the same time, the structure has low processing cost, is easy to batch, has low assembly errors and requirements, high versatility of parts, is easy to implement, and can be adjusted flexibly and can be coordinated in multiple ways;

[0017] 2. The passive filter has a simplified lightning protection structure. The conventional lightning protection board is decomposed. A customized PCB board and an insulating gasket are connected to the part of the inductor winding coil extending out of the cavity at each port and fixed with non-metallic screws. In addition to the lightning protection design of all ports, a set of receiving lightning protection boards and insulating gaskets are installed and fixed with non-metallic screws. One end of the lightning protection discharge tube is welded to the PCB board and the other end is connected to the cavity and the cover plate to achieve the grounding effect. Then the lightning protection design combination of each port is connected to the lightning protection receiving end by a cable to achieve lightning protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the three-dimensional structure of a simplified structure of a passive filter lightning protection proposed by the present invention;

[0019] Figure 2 A top view of a simplified structure of a passive filter lightning protection proposed by the present invention;

[0020] Figure 3 A structural left view of a simplified structure of a passive filter lightning protection proposed by the present invention;

[0021] Figure 4 A right side view of a simplified structure of a passive filter lightning protection proposed by the present invention;

[0022] Figure 5 A schematic diagram of a three-dimensional structure of a pin-type discharge tube with a simplified structure of a passive filter lightning protection proposed by the present invention;

[0023] Figure 6 A schematic diagram of the right side of a three-dimensional structure without a cover of a simplified structure of a passive filter lightning protection proposed by the present invention;

[0024] Figure 7 This is a schematic diagram of the left side of a three-dimensional structure without a cover of a simplified structure of a passive filter lightning protection proposed by the present invention;

[0025] Figure 8 This is a top view of a simplified passive filter lightning protection structure without a cover proposed by the present invention.

[0026] In the figure: 1. cavity; 2. cover plate; 3. cover plate fixing screw; 4. tuning screw; 5. input end connector; 6. input end fixing screw; 7. output end connector; 8. output end fixing screw; 9. common port connector; 10. common port fixing screw; 11. input copper sheet; 12. first fixing screw; 13. input end inductor winding coil; 14. output end copper sheet; 15. second fixing screw; 16. output end inductor winding coil; 17. common port copper sheet; 18. third fixing screw; 19. common port inductor winding coil; 20. input end arrester connecting cable; 21. output end arrester connecting cable ; 22. Common port lightning arrester connecting cable; 23. Input end lightning protection PCB board; 24. Input end insulation non-metallic gasket; 25. Fourth fixing screw; 26. Output end lightning protection PCB board; 27. Output end insulation non-metallic gasket; 28. Fifth fixing screw; 29. ​​Common port lightning protection PCB board; 30. Common port insulation non-metallic gasket; 31. Sixth fixing screw; 32. Lightning protection PCB board at the receiving end of lightning arrester; 33. Lightning arrester receiving end insulation non-metallic gasket; 34. Seventh fixing screw; 35. Discharge tube with pins; 36. Grounding metal sheet with discharge tube with pins; 37. Eighth fixing screw. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Example: Refer to Figure 1-8A simplified structure of passive filter lightning protection comprises: a cavity 1, a cover plate 2 is detachably connected to the cavity 1, and the detachable connection is convenient for replacing parts. An output lightning protection PCB board 26 is arranged on the left side of the cover plate 2, and an output source-insulating non-metallic gasket 27 is arranged on the lower side of the output lightning protection PCB board 26. The output source-insulating non-metallic gasket 27 is fixed between the cover plate 2 and the interlayer of the output lightning protection PCB board 26. The output lightning protection PCB board 26 and the output source-insulating non-metallic gasket 27 are detachably connected to the cover plate 2 by a fifth fixing screw 28, so as to facilitate the installation and replacement of various components. The output inductor winding coil 16 is plugged into the output lightning protection PCB board 26; an input lightning protection PCB board 23 is arranged on the left side of the cover plate 2, and the input lightning protection PCB board 23 is arranged on the rear side of the output lightning protection PCB board 26, and an input source-insulating non-metallic gasket 27 is arranged on the lower side of the input lightning protection PCB board 23. Gasket 24, the input-end insulated non-metallic gasket 24 is fixed between the cover plate 2 and the input-end lightning protection PCB board 23 interlayer, the input-end lightning protection PCB board 23 and the input-end insulated non-metallic gasket 24 are detachably connected to the cover plate 2 through the fourth fixing screw 25, which is convenient for the installation and replacement of various components, and the input-end lightning protection PCB board 23 is plugged into the input-end inductor winding coil 13; a common port lightning protection PCB board 29 is arranged on the right side of the cover plate 2, and a common port insulated non-metallic gasket 30 is arranged on the lower side of the common port lightning protection PCB board 29, and the common port insulated non-metallic gasket 30 is fixed between the cover plate 2 and the common port lightning protection PCB board 29 interlayer, the common port lightning protection PCB board 29 and the common port insulated non-metallic gasket 30 are detachably connected to the cover plate 2 through the sixth fixing screw 31, which is convenient for the installation and replacement of various components, and the common port inductor winding coil 19 is plugged into the common port lightning protection PCB board 29;

[0030] A lightning arrester receiving end lightning protection PCB board 32 is arranged in the middle of the cover plate 2, and a lightning arrester receiving end source-insulating non-metallic gasket 33 is arranged on the lower side of the lightning arrester receiving end lightning protection PCB board 32. The lightning arrester receiving end source-insulating non-metallic gasket 33 is fixed between the cover plate 2 and the lightning arrester receiving end lightning protection PCB board 32 interlayer. The lightning arrester receiving end lightning protection PCB board 32 and the lightning arrester receiving end source-insulating non-metallic gasket 33 are detachably connected to the cover plate 2 through the seventh fixing screw 34, which is convenient for installation and replacement of various components. A pin-type discharge tube 35 is fixedly connected to the lightning arrester receiving end lightning protection PCB board 32, and the other end of the pin-type discharge tube 35 is plugged with a pin-type discharge tube grounding metal sheet 36, and the pin-type discharge tube grounding metal sheet 36 is connected to the eighth fixing screw 34. 7 is detachably connected to the cover plate 2, which is convenient for installation and replacement of various components; the lightning protection PCB board 32 at the receiving end of the lightning arrester and the inductor winding coil 16 at the output end are fixedly connected through the output end lightning arrester connecting cable 21, so that the structure is more solid, the lightning protection PCB board 32 at the receiving end of the lightning arrester and the inductor winding coil 13 at the input end are fixedly connected through the input end lightning arrester connecting cable 20, so that the structure is more solid, the lightning protection PCB board 32 at the receiving end of the lightning arrester and the common port inductor winding coil 19 are fixedly connected through the common port lightning arrester connecting cable 22, so that the structure is more solid and the grounding effect is achieved, and the seventh fixing screw 34, the sixth fixing screw 31, the fifth fixing screw 28 and the fourth fixing screw 25 are all made of non-metallic materials to prevent the lightning protection equipment from conducting electricity;

[0031] A first tuning stud is fixedly connected to the left side of the cavity 1, and the other end of the output inductor winding coil 16 is plugged with an output copper sheet 14. The output copper sheet 14 and the convex head on the first tuning stud are detachably connected by a second fixing screw 15, and the detachable connection is convenient for replacement and adjustment. An output connector 7 is arranged on the left outer wall of the cavity 1, and the output connector 7 is detachably connected to the cavity 1 through an output fixing screw 8, and the detachable connection is convenient for replacement and adjustment. There are 4 output fixing screws 8, and the 4 output fixing screws 8 are evenly distributed at the four corners of the output connector 7 fixing part, and are evenly fixed at the four corners to prevent poor contact caused by loose contact points. A first convex head is fixedly connected to the right side of the output connector 7, and the first convex head is plugged into the groove on the left side of the output copper sheet 14; the left side of the cavity 1 is fixedly connected A second tuning stud is connected, and the other end of the input-end inductor winding coil 13 is plugged with an input copper sheet 11. The convex head on the input copper sheet 11 and the second tuning stud is detachably connected through a first fixing screw 12, and the detachable connection is convenient for replacement and adjustment. An input-end connector 5 is arranged on the left outer wall of the cavity 1, and the input-end connector 5 is arranged on the rear side of the output-end connector 7. The input-end connector 5 is detachably connected to the cavity 1 through an input-end fixing screw 6, and the detachable connection is convenient for replacement and adjustment. There are 4 input-end fixing screws 6, and the 4 input-end fixing screws 6 are evenly distributed at the four corners of the input-end connector 5 fixing part, and are evenly fixed at the four corners to prevent poor contact caused by loose contact points. A second convex head is fixedly connected to the right side of the input-end connector 5, and the second convex head is plugged into the groove on the left side of the input copper sheet 11;

[0032] A third tuning stud is fixedly connected to the right side of the cavity 1, and a common port copper sheet 17 is plugged into the other end of the common port inductor winding coil 19. The common port copper sheet 17 and the convex head on the third tuning stud are detachably connected through a third fixing screw 18, and the detachable connection is convenient for replacement and adjustment. A common port connector 9 is arranged on the outer wall of the right side of the cavity 1, and the common port connector 9 is detachably connected to the cavity 1 through a common port fixing screw 10, and the detachable connection is convenient for replacement and adjustment. There are 4 common port fixing screws 10, and the 4 common port fixing screws 10 are evenly distributed at the four corners of the common port connector 9 fixing part, and are evenly fixed at the four corners to prevent poor contact caused by loose contact points. A third convex head is fixedly connected to the left side of the common port connector 9, and the third convex head is plugged into the groove on the right side of the common port copper sheet 17;

[0033] The cover plate 2 is provided with a cover plate fixing screw 3, and the cavity 1 and the cover plate 2 are detachably connected through the cover plate fixing screw 3. The detachable connection is convenient for replacement and adjustment. A total of 42 cover plate fixing screws 3 are provided, and the 42 cover plate fixing screws 3 are evenly distributed on the cover plate 2. A plurality of cover plate fixing screws 3 are provided to make the cover plate 2 fit the cavity 1 tightly. The cover plate 2 is provided with a tuning screw 4, and a total of 10 tuning screws 4 are provided. The 10 tuning screws 4 are inserted into the cavity 1 through the cover plate 2 for reinforcement;

[0034] In the present invention, the conventional lightning protection board is decomposed, the inductor winding coil 13 at the input end extends out of the cavity part to connect the input end lightning protection PCB board 23, and the input end source-isolating non-metallic gasket 24 is set and fixed by the fourth fixing screw 25, the inductor winding coil 16 at the output end extends out of the cavity part to connect the output end lightning protection PCB board 26, and the output end source-isolating non-metallic gasket 27 is set and fixed by the fifth fixing screw 28, the inductor winding coil 19 at the common port extends out of the cavity part to connect the common port lightning protection PCB board 29, and the common port source-isolating non-metallic gasket 30 is set and fixed by the sixth fixing screw 31;

[0035] In addition to the lightning protection design of all ports, a group of lightning protection PCB boards 32 at the receiving end of the lightning arrester and the source-insulating non-metallic gasket 33 at the receiving end of the lightning arrester are installed and fixed by the seventh fixing screw 34, and one end of the lightning protection pin-type discharge tube 35 is welded to the lightning protection PCB board 32 at the receiving end of the lightning arrester, and the other end is connected to the cavity 1 and the cover plate 2 to achieve the grounding effect, and then the lightning protection design combination of each port is connected to the lightning protection PCB board 32 at the receiving end of the lightning arrester by the corresponding input end lightning arrester connection cable 20, output end lightning arrester connection cable 21, and common port lightning arrester connection cable 22 to achieve the lightning protection effect, which solves the problems of high cost, poor versatility and inflexible use caused by the limitation of external space when the filter series products are designed to meet the lightning protection requirements, and the adjustment is flexible and can be completed in multiple channels.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A simplified structure of passive filter lightning protection, characterized in that: include: A cavity (1), the cavity (1) is detachably connected to a cover plate (2), an output-end lightning protection PCB board (26) is arranged on the left side of the cover plate (2), an output-end inductor winding coil (16) is plugged into the output-end lightning protection PCB board (26), an input-end lightning protection PCB board (23) is arranged on the left side of the cover plate (2), the input-end lightning protection PCB board (23) is arranged on the rear side of the output-end lightning protection PCB board (26), the input-end inductor winding coil (13) is plugged into the input-end lightning protection PCB board (23), a common-port lightning protection PCB board (29) is arranged on the right side of the cover plate (2), the common-port lightning protection PCB board (29) is plugged into the common-port inductor winding coil (19), a lightning arrester receiving-end lightning protection PCB board (32) is arranged in the middle of the cover plate (2), the lightning arrester receiving-end lightning protection PCB board (32) is plugged into the common-port lightning protection PCB board (29), and a lightning arrester receiving-end lightning protection PCB board (32) is plugged into the common-port lightning protection PCB board (29). A discharge tube with a pin (35) is fixedly connected to the lightning PCB (32), and a grounding metal sheet (36) of the discharge tube with a pin is inserted at the other end of the discharge tube with a pin (35). The grounding metal sheet (36) of the discharge tube with a pin is detachably connected to the cover plate (2) via an eighth fixing screw (37). The lightning protection PCB (32) at the receiving end of the lightning arrester and the inductor winding coil (16) at the output end are fixedly connected via an output end lightning arrester connecting cable (21). The lightning protection PCB (32) at the receiving end of the lightning arrester and the inductor winding coil (13) at the input end are fixedly connected via an input end lightning arrester connecting cable (20). The lightning protection PCB (32) at the receiving end of the lightning arrester and the common port inductor winding coil (19) are fixedly connected via a common port lightning arrester connecting cable (22), thereby achieving a grounding effect. A first tuning stud is fixedly connected to the left side of the cavity (1); an output-end copper sheet (14) is plugged into the other end of the output-end inductor winding coil (16); the output-end copper sheet (14) and the protrusion on the first tuning stud are detachably connected via a second fixing screw (15); A second tuning stud is fixedly connected to the left side of the cavity (1), an input copper sheet (11) is plugged into the other end of the input-end inductor winding coil (13), and the input copper sheet (11) and the protrusion on the second tuning stud are detachably connected via a first fixing screw (12); A third tuning stud is fixedly connected to the right side of the cavity (1), a common port copper sheet (17) is plugged into the other end of the common port inductor winding coil (19), and the common port copper sheet (17) and the protrusion on the third tuning stud are detachably connected via a third fixing screw (18).

2. The simplified structure of passive filter lightning protection according to claim 1, characterized in that: An output terminal connector (7) is arranged on the left outer wall of the cavity (1), and the output terminal connector (7) is detachably connected to the cavity (1) via an output terminal fixing screw (8), and four output terminal fixing screws (8) are arranged, and the four output terminal fixing screws (8) are evenly distributed at the four corners of the output terminal connector (7) fixing part, and a first convex head is fixedly connected to the right side of the output terminal connector (7), and the first convex head is inserted into the groove on the left side of the output terminal copper sheet (14).

3. The simplified structure of passive filter lightning protection according to claim 1 is characterized in that: An input end connector (5) is arranged on the left outer wall of the cavity (1), and the input end connector (5) is arranged on the rear side of the output end connector (7). The input end connector (5) is detachably connected to the cavity (1) via an input end fixing screw (6), and four input end fixing screws (6) are arranged, and the four input end fixing screws (6) are evenly distributed at the four corners of the input end connector (5) fixing part. A second convex head is fixedly connected to the right side of the input end connector (5), and the second convex head is inserted into the left groove of the input copper sheet (11).

4. The simplified structure of passive filter lightning protection according to claim 1, characterized in that: A common port joint (9) is provided on the right outer wall of the cavity (1), and the common port joint (9) is detachably connected to the cavity (1) via a common port fixing screw (10), and four common port fixing screws (10) are provided, and the four common port fixing screws (10) are evenly distributed at the four corners of the common port joint (9) fixing part, and a third protrusion is fixedly connected to the left side of the common port joint (9), and the third protrusion is inserted into the groove on the right side of the common port copper sheet (17).

5. The simplified structure of passive filter lightning protection according to claim 1, characterized in that: A lightning arrester receiving end source-isolating non-metallic gasket (33) is arranged at the lower side of the lightning arrester receiving end lightning protection PCB board (32); the lightning arrester receiving end source-isolating non-metallic gasket (33) is fixed between the cover plate (2) and the lightning arrester receiving end lightning protection PCB board (32) interlayer; the lightning arrester receiving end lightning protection PCB board (32) and the lightning arrester receiving end source-isolating non-metallic gasket (33) are detachably connected to the cover plate (2) via a seventh fixing screw (34).

6. The simplified structure of passive filter lightning protection according to claim 1, characterized in that: An output-end source-isolating non-metallic gasket (27) is arranged at the lower side of the output-end lightning protection PCB board (26); the output-end source-isolating non-metallic gasket (27) is fixed between the cover plate (2) and the interlayer of the output-end lightning protection PCB board (26); the output-end lightning protection PCB board (26) and the output-end source-isolating non-metallic gasket (27) are detachably connected to the cover plate (2) via a fifth fixing screw (28).

7. The simplified structure of passive filter lightning protection according to claim 1, characterized in that: An input-end source-isolating non-metallic gasket (24) is arranged at the lower side of the input-end lightning protection PCB board (23); the input-end source-isolating non-metallic gasket (24) is fixed between the cover plate (2) and the interlayer of the input-end lightning protection PCB board (23); the input-end lightning protection PCB board (23) and the input-end source-isolating non-metallic gasket (24) are detachably connected to the cover plate (2) via a fourth fixing screw (25).

8. The simplified structure of passive filter lightning protection according to claim 1, characterized in that: A common port insulation non-metallic gasket (30) is arranged on the lower side of the common port lightning protection PCB board (29); the common port insulation non-metallic gasket (30) is fixed between the cover plate (2) and the interlayer of the common port lightning protection PCB board (29); the common port lightning protection PCB board (29) and the common port insulation non-metallic gasket (30) are detachably connected to the cover plate (2) via a sixth fixing screw (31).

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