Lightning protection structure of medium-wave broadcast transmitter

Abstract

The utility model relates to the technical field of lightning protection, in particular to a lightning protection structure of a medium-wave broadcast transmitter, which comprises a protection cabinet, the protection cabinet comprises a fixed cabinet, the bottom of the fixed cabinet is provided with a wire I, the bottom end of the wire I is fixedly connected with a grounding grid, and an L-shaped bracket is fixedly arranged on a base of an external antenna. A lightning rod is fixed to the top of the L-shaped support, a second wire fixed to the grounding grid is fixed to the bottom of the L-shaped support, the top end of the second wire is fixedly connected with the lightning rod, and the outer side of an external cable is sleeved with a conducting ring. According to the utility model, the conducting ring is sleeved on the cable of the antenna and the transmitter cabinet, so that the lightning stroke current on the cable can be grounded through the lead 3 when the current of lightning counterattack, lightning shielding failure or induction lightning stroke is transmitted to the transmitter cabinet through the cable along the antenna; the cable is effectively prevented from directly transmitting strong lightning stroke current to the transmitter cabinet, and electrical elements in the transmitter cabinet can be protected.

Description

Technical Field

[0001] This utility model relates to the field of lightning protection technology, specifically a lightning protection structure for a medium-wave broadcast transmitter. Background Technology

[0002] Medium wave radio transmitters are devices used by radio stations to transmit medium wave frequency signals. They are used to send sound, music and other information to a wide geographical area. Radio transmitters generally include an antenna and a transmitter cabinet. There are cables connecting the antenna and the cabinet. In thunderstorms, lightning may be transmitted through the antenna to the cabinet and damage the transmitter equipment inside the cabinet. Therefore, it is necessary to install lightning protection structures on radio transmitters to protect them.

[0003] The commonly used lightning protection structure is to place lightning rods around the antenna and install grounding wires on the cabinet. However, when the lightning rod is struck by lightning, the powerful lightning current may break down the air and cause lightning backflash, lightning swirl, or induced lightning strikes on adjacent antennas. This can cause the lightning current to continue to be transmitted along the cables to the cabinet. Although the grounding wire plays an important role in lightning protection, the powerful electromagnetic field generated by lightning may still induce current in the metal conductors of the cabinet, which can easily damage electronic components. Utility Model Content

[0004] The purpose of this invention is to provide a lightning protection structure for a medium-wave broadcast transmitter to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A lightning protection structure for a medium-wave broadcast transmitter includes:

[0007] A protective cabinet is fitted and fixed to the outside of the transmitter cabinet. The protective cabinet includes a fixed cabinet fixed to the bottom of the transmitter cabinet, a movable cabinet slidably arranged on the top of the fixed cabinet, and a wire is installed at the bottom of the fixed cabinet. The bottom end of the wire is fixedly connected to a grounding grid.

[0008] An L-shaped bracket is installed and fixed on the base of the antenna. A lightning rod is fixed to the top of the L-shaped bracket, and a second wire that is fixed to the grounding grid is fixed to the bottom of the L-shaped bracket. The top of the second wire is fixedly connected to the lightning rod.

[0009] A conductive ring is detachably fitted and fixed to the metal sheath of a cable. The conductive ring includes two matching semicircular rings. A conductor three is fixedly connected to the outer side of one of the semicircular rings, and the bottom end of the conductor three is fixedly connected to the grounding grid.

[0010] Furthermore, the fixed cabinet has a door panel hinged to its open side, and the door panel, the fixed cabinet, and the movable cabinet are all made of insulating material.

[0011] Furthermore, the bottom of the movable cabinet is fixed with a dustproof mesh plate that slides and inserts into the fixed cabinet, and the dustproof mesh plate is arranged on the outside of the heat dissipation holes of the transmitter cabinet.

[0012] Furthermore, two pads are fixed to the inner bottom surface of the fixed cabinet, and the pads are fixed to the bottom surface of the transmitter cabinet.

[0013] Furthermore, each of the two semicircular rings has a slot on its top surface, and a locking block is slidably engaged between the two slots.

[0014] Furthermore, the inner ring side of the semicircular ring is provided with a cutting edge, and the semicircular ring is made of conductive material.

[0015] Furthermore, the lightning rod is positioned at the top of the antenna, and the L-shaped bracket has a cable tray inside to facilitate the passage of the second conductor.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. A lightning rod is fixed to the top of the antenna using an L-shaped bracket. The lightning rod is connected to the grounding grid via wire two. The lightning rod can ground the lightning above the antenna through wire two, effectively preventing the lightning current from damaging the antenna. A conductive ring is fixed to the outside of the cable. The conductive ring is in contact with the metal sheath of the cable. When the current of lightning backflash, lightning swirl, or induced lightning strike is transmitted along the antenna through the cable to the transmitter cabinet, the conductive ring, together with wire three, can transmit part of the lightning current on the cable to the grounding grid through wire three, effectively blocking the cable from transmitting the strong lightning current to the transmitter cabinet, effectively preventing the lightning current from damaging the electrical components inside the transmitter cabinet.

[0018] 2. By fixing a fixed cabinet at the bottom of the transmitter cabinet and sliding a movable cabinet at the top of the fixed cabinet, in thunderstorms, the output end of the electric actuator shortens, causing the movable cabinet to move down and close to the top of the fixed cabinet. This creates a sealed cabinet cavity formed by the fixed cabinet, movable cabinet, and door panel, providing insulation and protection for the transmitter cabinet. This further prevents induced current from damaging the internal electronic components of the transmitter cabinet. Even if external cables transmit a strong lightning current to the protective cabinet, the conductor at the bottom of the protective cabinet can ground the current again through the grounding grid, further improving the lightning protection effect of the broadcast transmitter. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a utility model Figure 1 A magnified view of the structure at point A in the middle;

[0021] Figure 3 This is a schematic diagram of the movable cabinet upward movement structure in this utility model;

[0022] Figure 4 This is a schematic diagram of the conductive ring in the combined and unfolded states of this utility model;

[0023] Figure 5 This is a schematic diagram of the protective cabinet and transmitter cabinet in this utility model.

[0024] In the diagram: 100, Protective cabinet; 110, Fixed cabinet; 111, Pad block; 120, Movable cabinet; 121, Dustproof mesh panel; 130, Door panel; 140, Wire 1; 150, Grounding grid; 160, Electric push rod; 170, Temperature and humidity sensor; 200, L-shaped bracket; 210, Lightning rod; 220, Wire 2; 300, Conductive ring; 310, Semi-circular ring; 311, Slot; 320, Wire 3; 330, Clip block. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example 1, please refer to Figure 1 - Figure 5 In this embodiment of the utility model, a lightning protection structure for a medium-wave broadcast transmitter includes a protective cabinet 100 fixedly attached to the outside of the transmitter cabinet. The protective cabinet 100 includes a fixed cabinet 110 fixed to the bottom of the transmitter cabinet. A movable cabinet 120 is slidably arranged on the top of the fixed cabinet 110. A first wire 140 is installed at the bottom of the fixed cabinet 110. A grounding grid 150 is fixedly connected to the bottom end of the first wire 140. An L-shaped bracket 200 is installed and fixed on the base of the external antenna. A lightning rod 210 is fixed at the top of the L-shaped bracket 200. A second wire 220 fixed to the grounding grid 150 is fixed at the bottom of the L-shaped bracket 200. The top end of the second wire 220 is fixedly connected to the lightning rod 210. A conductive ring 300 is sleeved and installed on the outside of the external cable. The conductive ring 300 includes two adapted and spliced ​​semi-circular rings 310. A third wire 320 is fixedly connected to the outside of one semi-circular ring 310. The bottom end of the third wire 320 is fixedly connected to the grounding grid 150.

[0027] Specifically, by installing a conductive ring 300 on the cable connecting the antenna and the transmitter cabinet, and connecting the conductive ring 300 to the metal outer side of the cable, when the current from a lightning backflash, lightning swirl, or induced lightning strike is transmitted along the antenna through the cable to the transmitter cabinet, the conductor 320 can ground the lightning current on the cable, effectively preventing the cable from directly transmitting the powerful lightning current to the transmitter cabinet. This helps protect the electrical components inside the transmitter cabinet. By insulating the transmitter cabinet with a protective cabinet 100 on the outside, during the transmission of lightning current to the transmitter cabinet, the conductor 140 at the bottom of the protective cabinet 100 can ground the lightning current on the protective cabinet 100, while simultaneously insulating and sealing the transmitter cabinet, effectively preventing the induced current from damaging the electronic components inside the transmitter cabinet.

[0028] like Figure 3 and Figure 5 As shown, in this embodiment, the open side of the fixed cabinet 110 is hinged with a door panel 130. The door panel 130, the fixed cabinet 110 and the movable cabinet 120 are all made of insulating materials. The insulating materials can be epoxy resin, polypropylene and other materials. The specific insulating materials can be selected according to the actual processing needs, which will not be described in detail here.

[0029] In this embodiment, in the initial state, the output end of the electric actuator 160 extends, causing the movable cabinet 120 to move upward away from the fixed cabinet 110. This allows the dustproof mesh plate 121 between the movable cabinet 120 and the fixed cabinet 110 to be arranged outside the heat dissipation holes of the transmitter cabinet, facilitating ventilation and heat dissipation for the electrical components inside the transmitter cabinet. The dustproof mesh plate 121 can effectively prevent external dust from entering the heat dissipation holes. When temporary insulation protection of the transmitter cabinet is required during thunderstorms, the output end of the electric actuator 160 shortens, causing the movable cabinet 120 to be spliced ​​together with the fixed cabinet 110. At this time, the dustproof mesh plate 121 is stored inside the fixed cabinet 110. The fixed cabinet 110, the movable cabinet 120, and the door panel 130 can insulate and protect the transmitter cabinet, preventing the induced current generated by lightning strikes from damaging the electronic components inside the transmitter cabinet.

[0030] like Figure 3 As shown, in this embodiment, the top of the fixed cabinet 110 is provided with an i-shaped cavity for accommodating the dustproof mesh plate 121, wherein the dustproof mesh plate 121 is also i-shaped, and the two end faces of the dustproof mesh plate 121 are attached to the inner side of the closed door panel 130.

[0031] like Figure 5 As shown, in this embodiment, a temperature and humidity sensor 170 is installed and fixed on the inner top of the active cabinet 120. Before a thunderstorm caused by a hot lightning strike occurs, when the temperature and humidity sensor 170 detects that the humidity and temperature in the air have reached a certain value, the external controller controls the electric push rod 160 to work to achieve automatic insulation protection of the transmitter cabinet. The temperature and humidity sensor 170 is a prior art component, and its specific working principle will not be described in detail.

[0032] like Figure 3 As shown, in this embodiment, the bottom of the mobile cabinet 120 is fixed with a dustproof mesh plate 121 that is slidably inserted into the fixed cabinet 110. The dustproof mesh plate 121 is arranged on the outside of the heat dissipation holes of the transmitter cabinet. During normal use of the transmitter cabinet, the dustproof mesh plate 121 is arranged on the outside of the heat dissipation holes, which helps the transmitter cabinet to exchange airflow with the outside world and helps the transmitter cabinet to dissipate heat.

[0033] like Figure 5 As shown, in this embodiment, two pads 111 are fixed to the inner bottom surface of the fixed cabinet 110. The pads 111 are fixed to the bottom surface of the transmitter cabinet, so that the transmitter cabinet can be installed and fixed inside the protective cabinet 100.

[0034] like Figure 4 As shown, in this embodiment, the top surfaces of the two semicircular rings 310 are provided with slots 311, and a locking block 330 is slidably engaged between the two slots 311. When installing the conductive ring 300, a circumferential cut can be made at a suitable position on the outside of the cable to expose the metal sheath on the cable. Then, the inner ring edges of the two semicircular rings 310 of the conductive ring 300 are inserted into the circumferential cut, so that the charge on the cable can be quickly grounded through the conductive ring 300 and the conductor 320.

[0035] In this embodiment, the semi-circular ring 310 is made of a conductive material, such as copper, aluminum, or silver. The specific material can be selected according to actual processing needs, and the material selection will not be described in detail here.

[0036] In this embodiment, initially, the card block is arranged inside the slot 311 of a semi-circular ring 310. After the two semi-circular rings 310 are spliced ​​into a complete conductive ring 300, the card block 330 is slid between the two slots 311, thereby fixing the two semi-circular rings 310 to the outside of the cable. A rubber sleeve is fixed to the outside of the card block 330. The rubber sleeve increases the friction between the card block 330 and the slot 311, making it easy for the card block 330 to slide and stay in different positions inside the slot 311 without moving on its own. Both the card block 330 and the slot 311 are arc-shaped.

[0037] like Figure 1 As shown, in this embodiment, the lightning rod 210 is arranged at the top of the antenna. The L-shaped bracket 200 has a cable tray inside to facilitate the passage of the wire 220. When the lightning rod 210 is placed directly above the antenna, it becomes the highest point of the entire structure. According to the principle of tip discharge, lightning is more likely to strike the lightning rod 210 rather than the antenna, thereby protecting the antenna and the equipment connected to it.

[0038] In this embodiment, the antenna, antenna base, L-shaped bracket 200 and lightning rod 210 are usually installed on the roof. The specific installation location is existing technology and will not be described in detail here.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A lightning protection structure for a medium wave broadcast transmitter, characterized by, The utility model relates to a kind of lightning protection device of transmitter, including: Protective cabinet (100) is fixedly sleeved outside the transmitter cabinet, and the protective cabinet (100) includes the fixed cabinet (110) fixed with the bottom of transmitter cabinet, and the top of fixed cabinet (110) is slidably arranged with movable cabinet (120), and the bottom of fixed cabinet (110) is installed with wire one (140), and the bottom end of wire one (140) is fixedly connected with grounding net (150); L-shaped support (200) is installed and fixed on the base of antenna, and the top of L-shaped support (200) is fixed with lightning rod (210), and the bottom of L-shaped support (200) is fixed with wire two (220) fixed with grounding net (150), and the top end of wire two (220) is fixedly connected with lightning rod (210); Conductive ring (300) is detachably fixedly sleeved on the metal outer skin of cable, and the conductive ring (300) includes two half-round rings (310) adaptively spliced, and the outer side of one half-round ring (310) is fixedly connected with wire three (320), and the bottom end of wire three (320) is fixedly connected with grounding net (150).

2. The lightning protection structure for a medium wave broadcast transmitter according to claim 1, characterized in that, The open side of fixed cabinet (110) is hingedly connected with door plate (130), and door plate (130), fixed cabinet (110) and movable cabinet (120) are all made of insulating material.

3. The lightning protection structure for a medium wave broadcast transmitter according to claim 1, wherein The bottom of movable cabinet (120) is fixed with dust screen plate (121) slidably inserted with fixed cabinet (110), and dust screen plate (121) is arranged outside the heat dissipation hole of transmitter cabinet.

4. The lightning protection structure for a medium wave broadcast transmitter according to claim 1, wherein The inner bottom surface of fixed cabinet (110) is fixed with two pad blocks (111), and pad block (111) is fixed with the bottom surface of transmitter cabinet.

5. The lightning protection structure for a medium wave broadcast transmitter according to claim 1, wherein The top surface of two half-round rings (310) is provided with clamping groove (311), and clamping block (330) is slidably clamped between two clamping grooves (311).

6. The lightning protection structure for a medium wave broadcast transmitter according to claim 1, wherein The inner ring side of half-round ring (310) is provided with blade part, and half-round ring (310) is made of conductive material.

7. The lightning protection structure for a medium wave broadcast transmitter according to claim 1, wherein Lightning rod (210) is arranged at the top end of antenna, and the inside of L-shaped support (200) is provided with wire channel for facilitating wire two (220) to pass through.

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