Lightning-protection waterproof duplex filter

Abstract

The utility model discloses a lightning protection waterproof duplex filter, and specifically relates to the filter technology field, comprising a housing, a debugging cover plate arranged in the housing, and a waterproof cover plate arranged on the top side of the housing; n-type connectors are arranged at the two ends of the shell. According to the utility model, the debugging cover plate and the waterproof cover plate are arranged inside and outside the housing in a sealing manner, and structures such as the lightning protection capacitor and the rubber sealing ring are matched to form a direct current lightning protection channel, so that huge current generated by lightning stroke is instantly grounded and discharged, and the duplex filter is not influenced by lightning stroke current, thereby ensuring normal operation of a communication system under extreme conditions; and by arranging the waterproof ventilation valve, air inside and outside the device can slowly circulate, and the waterproof performance of the device can be effectively evaluated by using an airtight test method when the device is manufactured while the consistent internal and external pressure difference is ensured, so that the duplex filter has good waterproof and lightning protection performance.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a lightning protection and waterproof duplex filter. Background Art

[0002] A filter is a filter circuit composed of capacitors, inductors and resistors. The filter can effectively filter out a specific frequency point in the power line or frequencies other than the frequency point to obtain a power signal with a specific frequency, or eliminate a power signal with a specific frequency.

[0003] At present, for duplex filters working outdoors, unlike the good placement environment indoors, it is easy to have rain, snow and thunder outdoors frequently, and lightning strikes and rain can easily cause damage to the equipment, thus affecting the normal use of the equipment. Therefore, it is necessary to design a lightning-proof and waterproof duplex filter to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a lightning-proof and waterproof duplex filter. By sealingly arranging a debugging cover plate and a waterproof cover plate inside and outside the shell, and cooperating with structures such as a lightning protection capacitor and a rubber sealing ring, a DC lightning protection channel can be formed, so that the huge current generated by the lightning strike can be instantly discharged to the ground, so that the duplex filter is not affected by the lightning current, thereby ensuring the normal operation of the communication system under extreme conditions. In addition, by arranging a waterproof breathable valve, the air inside and outside the device can be slowly circulated to ensure that the pressure difference between the inside and outside is consistent. At the same time, the airtight test method can be used to effectively evaluate the waterproof performance of the device when the device is manufactured, so that the duplex filter has good waterproof and lightning protection performance, so as to solve the above-mentioned deficiencies in the technology.

[0005] In order to achieve the above object, the utility model provides the following technical solution: a lightning protection and waterproof duplex filter, comprising:

[0006] A housing, wherein a debugging cover is provided inside the housing, and a waterproof cover is provided on the top side of the housing;

[0007] Both ends of the shell are provided with N-type connectors, and a waterproof breathable valve is provided on one side of one end of the shell close to the N-type connector;

[0008] A cross-coupling dielectric layer is provided at the bottom of the cavity of the shell, a cross-coupling rod is connected to the top of the cross-coupling dielectric layer, a plurality of first winding inductors facing the N-type connector are provided inside the cavity of the shell, one end of the first winding inductor is connected to a wave trap, and the other end of the first winding inductor is connected to a tap coupling rod, and one end of the tap coupling rod is welded to the metal inner core of the N-type connector;

[0009] A PCB board is arranged on the top side of the debugging cover, a lightning protection capacitor and a second winding inductor are arranged on the PCB board, and two ends of the PCB board are respectively connected to a first radio frequency cable and a second radio frequency cable.

[0010] Preferably, a waterproof groove is provided on the top side of the shell, and a rubber sealing ring is installed inside the waterproof groove.

[0011] Preferably, a plurality of debugging cover screws are provided on the side of the debugging cover, and the debugging cover is fixedly connected to the cavity of the shell through the debugging cover screws.

[0012] Preferably, a plurality of waterproof cover plate screws are provided on the side of the waterproof cover plate, and the waterproof cover plate is fixedly connected to the cavity of the shell through the waterproof cover plate screws.

[0013] Preferably, one end of the N-type connector is provided with a plurality of joint screws, and the N-type connector is fixedly connected to the housing via the joint screws.

[0014] Preferably, a plurality of tuning screws are provided through the side wall of the debugging cover plate, and a locking nut is connected to the top end of the tuning screw.

[0015] Preferably, the inner surface of the shell is electroplated with a copper layer or a silver layer, and the outer surface of the shell is sprayed with an anti-corrosion layer.

[0016] In the above technical solution, the technical effects and advantages provided by the utility model are:

[0017] By sealing the debugging cover and the waterproof cover inside and outside the shell, and cooperating with structures such as lightning protection capacitors and rubber sealing rings, a DC lightning protection channel can be formed, so that the huge current generated by the lightning strike can be instantly discharged to the ground, so that the duplex filter is not affected by the lightning current, thereby ensuring the normal operation of the communication system under extreme conditions. In addition, by setting a waterproof breathable valve, the air inside and outside the device can circulate slowly to ensure that the pressure difference between the inside and outside is consistent. At the same time, the airtight test method can be used during device manufacturing to effectively evaluate the waterproof performance of the device, thereby making the duplex filter have good waterproof and lightning protection performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the explosion structure of the utility model;

[0020] Figure 2It is a schematic diagram of the top view of the housing of the utility model;

[0021] Figure 3 This is a schematic diagram of the top view of the debugging cover plate of the utility model;

[0022] Figure 4 This is a circuit schematic diagram of the utility model.

[0023] Description of reference numerals:

[0024] 1. Shell; 2. Debugging cover; 3. Waterproof cover; 4. Rubber sealing ring; 5. N-type connector; 6. Waterproof breathable valve; 7. Cross-coupling rod; 8. Cross-coupling dielectric layer; 9. Trap filter; 10. First winding inductor; 11. Tap coupling rod; 12. Debugging cover screw; 13. Tuning screw; 14. Locking nut; 15. PCB board; 16. Lightning protection capacitor; 17. Second winding inductor; 18. First RF cable; 19. Second RF cable; 20. Connector screw; 21. Waterproof cover screw. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] The utility model provides Figure 1-Figure 4 A lightning protection and waterproof duplex filter is shown, comprising:

[0027] A housing 1, wherein a debugging cover plate 2 is disposed inside the housing 1, and a waterproof cover plate 3 is disposed on the top side of the housing 1;

[0028] The inner surface of the housing 1 is electroplated with a copper layer or a silver layer, and the outer surface of the housing 1 is sprayed with an anti-corrosion layer.

[0029] The housing 1 is the most basic component of the duplex filter and is generally made of an aluminum alloy die-casting machine. Its inner surface may be electroplated with a layer of copper or silver with good conductivity, and its outer surface may be sprayed with a coating to make it resistant to salt spray corrosion.

[0030] A plurality of debugging cover screws 12 are provided on the side of the debugging cover 2, and the debugging cover 2 is fixedly connected to the cavity of the housing 1 through the debugging cover screws 12;

[0031] The debugging cover 2 is formed by stamping an aluminum plate and is mounted on the cavity of the housing 1 using a large number of debugging cover screws 12 to form a closed space so that electromagnetic waves can propagate in the closed space.

[0032] A plurality of waterproof cover plate screws 21 are provided on the side of the waterproof cover plate 3 , and the waterproof cover plate 3 is fixedly connected to the cavity of the housing 1 through the waterproof cover plate screws 21 .

[0033] The waterproof cover plate 3 is stamped from an aluminum plate, and a coating is sprayed on the surface to produce salt spray corrosion resistance. The waterproof cover plate screws 21 are used to install it on the cavity of the housing 1 to isolate the inside and outside of the cavity and produce a waterproof function.

[0034] Both ends of the housing 1 are provided with N-type connectors 5, and a waterproof breathable valve 6 is provided on one side of one end of the housing 1 close to the N-type connector 5;

[0035] The waterproof breathable valve 6 is a plastic or metal part that only allows air to pass slowly while water molecules cannot pass through. Its function is to balance the pressure difference inside and outside the device to avoid the performance degradation of the duplex filter in certain extreme cases.

[0036] One end of the N-type connector 5 is provided with a plurality of joint screws 20 , and the N-type connector 5 is fixedly connected to the housing 1 via the joint screws 20 .

[0037] The N-type connector 5 , also called a joint, is an interface for radio frequency signals to enter and exit the duplex filter, and can be installed on the cavity of the housing 1 using a joint screw 20 .

[0038] A cross-coupling dielectric layer 8 is provided at the bottom of the cavity of the housing 1, and a cross-coupling rod 7 is connected to the top of the cross-coupling dielectric layer 8. A plurality of first winding inductors 10 facing the N-type connector 5 are provided inside the cavity of the housing 1, and a wave trap 9 is connected to one end of the first winding inductor 10, and a tap coupling rod 11 is connected to the other end of the first winding inductor 10, and one end of the tap coupling rod 11 is welded to the metal inner core of the N-type connector 5;

[0039] The cross-coupling rod 7 is machined from a copper rod and its function is to generate a zero point inside the filter so as to achieve a specific rectangular coefficient, while the cross-coupling dielectric layer 8 is machined from an insulating polytetrafluoroethylene material and its function is to suspend the cross-coupling rod 7 inside the cavity of the housing 1 without short-circuiting the cavity.

[0040] The wave trap 9 is a hollow metal cylinder, which can be equivalent to a capacitor, referring to CA1, CT1 and CR1 in the circuit schematic diagram.

[0041] The first winding inductor 10 is formed by winding a copper wire covered with a layer of insulating grease, and can be equivalent to an inductor, referring to LA1, LT1 and LR1 in the circuit schematic diagram.

[0042] The tap coupling rod 11 is machined from a copper rod and welded to the metal inner core of the N-type connector 5 to generate a capacitance with the tap in the cavity, refer to CA, CT and CR in the circuit schematic diagram.

[0043] A PCB board 15 is provided on the top side of the debugging cover 2 , a lightning protection capacitor 16 and a second winding inductor 17 are provided on the PCB board 15 , and two ends of the PCB board 15 are respectively connected to a first RF cable 18 and a second RF cable 19 .

[0044] The PCB board 15 is a small microstrip circuit board, which supports the lightning protection capacitor 16, the second winding inductor 17, the first radio frequency cable 18 and the second radio frequency cable 19;

[0045] The lightning protection capacitor 16 is the main part for realizing the lightning protection function. It is turned on when a large current passes through, thereby achieving the function of guiding the lightning current. Refer to CA2, CT2 and CR2 in the circuit schematic diagram;

[0046] The second winding inductor 17 is wound by a copper wire covered with a layer of insulating grease, which can be equivalent to an inductor, referring to LA2, LT2 and LR2 in the circuit schematic diagram;

[0047] The first RF cable 18 connects the ANT lightning protection board and the TX lightning protection board, and uses soldering to fix the inner core and the surface layer at both ends, and the second RF cable 19 also connects the ANT lightning protection board and the RX lightning protection board, and also uses soldering to fix the inner core and the surface layer at both ends.

[0048] A waterproof groove is provided on the top side of the housing 1 , and a rubber sealing ring 4 is installed inside the waterproof groove.

[0049] The rubber sealing ring 4 is made of rubber and has good elasticity. It is installed in the waterproof groove on the cavity of the shell 1. The waterproof cover plate 3 compresses the rubber sealing ring 4 to produce a waterproof effect.

[0050] The side wall of the debugging cover plate 2 is provided with a plurality of tuning screws 13, and the top of the tuning screw 13 is connected with a locking nut 14. The locking nut 14 is generally a standard part, and its function is to lock the tuning screw 13 on the debugging cover plate 2 to prevent the tuning screw 13 from loosening and thus affecting the filter performance.

[0051] The tuning screw 13 is a metal screw with its own thread, which is inserted into the debugging cover 2. By penetrating the debugging cover 2 and penetrating into the cavity, the electromagnetic field can be disturbed, thereby achieving the effect of changing the filter network.

[0052] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A lightning protection and waterproof duplex filter, characterized in that: include: A housing (1), wherein a debugging cover plate (2) is arranged inside the housing (1), and a waterproof cover plate (3) is arranged on the top side of the housing (1); Both ends of the housing (1) are provided with N-type connectors (5), and a waterproof breathable valve (6) is provided on one side of one end of the housing (1) close to the N-type connector (5); A cross-coupling dielectric layer (8) is provided at the bottom side of the cavity of the shell (1), a cross-coupling rod (7) is connected to the top side of the cross-coupling dielectric layer (8), a plurality of first winding inductors (10) facing the N-type connector (5) are provided inside the cavity of the shell (1), one end of the first winding inductor (10) is connected to a wave trap (9), and the other end of the first winding inductor (10) is connected to a tap coupling rod (11), and one end of the tap coupling rod (11) is welded to the metal inner core of the N-type connector (5); A PCB board (15) is provided on the top side of the debugging cover plate (2), a lightning protection capacitor (16) and a second winding inductor (17) are provided on the PCB board (15), and two ends of the PCB board (15) are respectively connected to a first radio frequency cable (18) and a second radio frequency cable (19).

2. A lightning protection and waterproof duplex filter according to claim 1, characterized in that: A waterproof groove is provided on the top side of the housing (1), and a rubber sealing ring (4) is installed inside the waterproof groove.

3. The lightning protection and waterproof duplex filter according to claim 1, characterized in that: A plurality of debugging cover screws (12) are provided on the side of the debugging cover (2), and the debugging cover (2) is fixedly connected to the cavity of the housing (1) via the debugging cover screws (12).

4. The lightning protection and waterproof duplex filter according to claim 1, characterized in that: A plurality of waterproof cover plate screws (21) are provided on the side of the waterproof cover plate (3), and the waterproof cover plate (3) is fixedly connected to the cavity of the housing (1) via the waterproof cover plate screws (21).

5. The lightning protection and waterproof duplex filter according to claim 1, characterized in that: One end of the N-type connector (5) is provided with a plurality of joint screws (20), and the N-type connector (5) is fixedly connected to the housing (1) via the joint screws (20).

6. The lightning protection and waterproof duplex filter according to claim 1, characterized in that: A plurality of tuning screws (13) are provided through the side wall of the debugging cover plate (2), and the top ends of the tuning screws (13) are connected with locking nuts (14).

7. The lightning protection and waterproof duplex filter according to claim 1, characterized in that: The inner surface of the shell (1) is electroplated with a copper layer or a silver layer, and the outer surface of the shell (1) is sprayed with an anti-corrosion layer.

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