Explosion-proof indoor omnidirectional ceiling antenna

Abstract

The utility model relates to an explosion-proof indoor omnidirectional ceiling antenna. The antenna comprises an outer cover, a first oscillator, a second oscillator and a feed connection wire, the feed connection wire is electrically connected with the two oscillators at the same time, an insulation block is clamped between the first oscillator and the second oscillator, the antenna is characterized in that the outer cover comprises a bottom plate and a bell-shaped cover which are matched with each other in a sealing mode, the feed connection wire penetrates through the bottom plate, and the penetrating position is arranged in a sealing mode; the outer cover is filled with inert gas, the outer cover is provided with a one-way gas injection port and an exhaust port, and a plug is sealed in the exhaust port. According to the utility model, the outer cover is completely sealed and is filled with the inert gas, so that the electrifying element in the outer cover is located in the inert gas environment, and the explosion-proof effect is achieved.

Description

Technical Field

[0001] The utility model relates to an indoor ceiling antenna, in particular to an explosion-proof indoor omnidirectional ceiling antenna. Background Art

[0002] Antenna is a very commonly used converter, which converts guided waves into electromagnetic waves, or vice versa. Engineering systems such as radio communication, broadcasting, television, radar, navigation, electronic countermeasures, remote sensing, radio astronomy, etc., all of which use electromagnetic waves to transmit information, rely on antennas to work. There are many types of antennas, among which indoor antennas are small antennas suitable for closed rooms.

[0003] Indoor antennas currently on the market generally include an outer cover, a first oscillator, a second oscillator and a feeder connection, and the feeder connection is electrically connected to both oscillators. Electrically powered electronic components may generate sparks under certain conditions. In some specific confined spaces, such as explosion-proof areas with high combustible dust content or high combustible gas content, even a tiny spark may cause a very serious explosion hazard. For this reason, the number of electronic components in the explosion-proof area needs to be strictly controlled, and all electronic components need to have explosion-proof effects. Although the outer covers of existing indoor antennas are made of flame-retardant plastics, the circuits themselves do not have explosion-proof effects, so they are not suitable for use in explosion-proof areas.

[0004] In order to meet the needs of signal coverage and real-time communication in explosion-proof areas, especially in dangerous places such as chemical plants and those with flammable and explosive materials, as well as public security and fire rescue sites involving major safety accidents, it is urgent to develop a safe indoor antenna with explosion-proof effect. Summary of the invention

[0005] The utility model provides an explosion-proof indoor omnidirectional ceiling antenna, which solves the problem of lack of explosion-proof effect in the prior art.

[0006] The above technical problems of the utility model are mainly solved by the following technical solutions: an explosion-proof indoor omnidirectional ceiling antenna, comprising an outer cover, a first vibrator, a second vibrator and a feeder wiring, the feeder wiring is electrically connected to the two vibrators at the same time, an insulating block is clamped between the first vibrator and the second vibrator, and is characterized in that: the outer cover comprises a bottom plate and a bell-shaped cover that are sealed to each other, the feeder wiring is arranged to penetrate the bottom plate and the penetration is sealed, the outer cover is filled with inert gas, a one-way gas injection port and an exhaust port are provided on the outer cover, and a plug is sealed in the exhaust port.

[0007] The utility model completely seals the outer cover and fills the inner part with inert gas, generally helium, so that the internal energized components are in an inert gas environment, thus having an explosion-proof effect. The inert gas is injected through the one-way gas injection port, and the air in the outer cover is squeezed out from the exhaust port by the inert gas. The injection amount of the inert gas is slightly larger than the volume of the cavity in the outer cover, and then the exhaust port is sealed with a plug.

[0008] Furthermore, the inner surface of the base plate is provided with a plurality of first abutment plates distributed in a circular array and relatively protruding, the inner surface of the bell-shaped cover is provided with a plurality of second abutment plates distributed in a circular array and relatively protruding, the first abutment plates and the second abutment plates abut against the upper and lower sides of the first oscillator, the inner surface of the bell-shaped cover is also provided with a plurality of third abutment plates distributed in a circular array and relatively protruding, all of the third abutment plates abut against the circumferential outer wall of the second oscillator. Since the first vibrator is generally funnel-shaped and the second vibrator is similar to a wine glass, a concave cavity that can accommodate gas is formed between the two vibrators. Since the structures of the two vibrators are relatively thin, their own strength is not high and their stability is poor, it is generally necessary to set a positioning mechanism in the outer cover for fixation. The first abutment plate and the second abutment plate in the utility model are used to clamp and fix the first vibrator up and down, and the third abutment plate is used to fix the second vibrator circumferentially, so that the two vibrators are better positioned. At the same time, a gap is formed between the abutment plates for free ventilation. Therefore, the abutment plates will not affect the free flow of air in the inner and outer areas of the vibrator. In this way, during the ventilation process, it can be ensured that the original air is filled with inert gas as much as possible.

[0009] Furthermore, a one-way gas injection port is arranged at the center of the bell-shaped jar, and a one-way gas valve and a sealant covering the outside of the one-way gas valve are arranged in the one-way gas injection port; an exhaust port is arranged at the center of the bottom plate, and the power supply wiring is arranged to penetrate the plug. Firstly, the density of helium is relatively low, so it is suitable to inject gas from top to bottom. Helium tends to float at the top of the inner cavity of the outer jar, and the air at the bottom of the helium is slowly squeezed out from the exhaust port at the bottom, so that the purity of the helium in the inner cavity of the outer jar can be ensured to be relatively high.

[0010] Furthermore, an air injection pipe extending into the second vibrator is arranged inside the bell jar and at the position of the one-way air injection port. Because the air inside the second vibrator has poor fluidity, the air injection pipe needs to be extended to blow away the original air and improve the purity of the helium.

[0011] Therefore, compared with the prior art, the utility model has the following characteristics: 1. The utility model completely seals the outer cover and fills the inside with inert gas, so that the internal energized components are in an inert gas environment, thus having an explosion-proof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] AttachedFigure 1 It is a structural schematic diagram of the utility model;

[0013] Attached Figure 2 It is an airflow diagram of the utility model during gas injection. DETAILED DESCRIPTION

[0014] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0015] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0016] Example 1: See Figure 1 An explosion-proof indoor omnidirectional ceiling antenna includes an outer cover 100, a first vibrator 10, a second vibrator 20 and a feeder connection 30. The plastic materials on the outer cover and the feeder connection are flame-retardant plastics. The feeder connection is electrically connected to the two vibrators at the same time. An insulating block 40 is clamped between the first vibrator and the second vibrator. The outer cover includes a bottom plate 110 and a bell-shaped cover 120 that are sealed with each other. The outer cover is filled with helium. A one-way gas injection port 130 and an exhaust port 140 are provided on the outer cover. A plug 150 is sealed in the exhaust port.

[0017] See Figure 1 A plurality of first abutting pieces 111 distributed in a circular array and relatively protruding are provided on the inner surface of the bottom plate, a plurality of second abutting pieces 121 distributed in a circular array and relatively protruding are provided on the inner surface of the bell-shaped cover, the first abutting pieces and the second abutting pieces abut against the upper and lower sides of the first oscillator, a plurality of third abutting pieces 122 distributed in a circular array and relatively protruding are provided on the inner surface of the bell-shaped cover, and all the third abutting pieces abut against the circumferential outer wall of the second oscillator.

[0018] See Figure 1 The one-way air injection port is arranged at the center of the bell-shaped cover, and a one-way air valve 131 and a sealant 132 covering the outside of the one-way air valve are arranged in the one-way air injection port; the exhaust port is arranged at the center of the bottom plate, and the power supply wiring is arranged as a through-plug.

[0019] See Figure 1 A gas injection pipe 123 extending toward the interior of the second vibrator is provided on the inner side of the bell jar and at the location of the one-way gas injection port.

[0020] See Figure 1 A stud tube 112 is arranged on the outer side of the bottom plate and located at the exhaust port. A screw cap 113 is screwed on the stud tube. The screw cap can abut the plug against the exhaust port, and the feeding connection is arranged to pass through the screw cap; an inner recess 114 is arranged on the bottom plate and is recessed in the direction of the first vibrator; the bottom plate and the bell-shaped cover are fixedly connected to each other by bolts, and a sealing rubber ring 160 is arranged at the joint surface of the two, and the cross section of the sealing rubber ring is L-shaped.

[0021] See Figure 2 The process of injecting helium in this embodiment is as follows: insert the gas needle into the one-way gas valve, keep the exhaust port unobstructed, and then start to inject gas. The helium first flows into the concave cavity surrounded by the second vibrator. The helium slowly squeezes out the air in this part of the cavity, and then the helium slowly fills the upper space of the bell jar and overflows from the gap of the third abutment plate, and starts to fill the internal cavity of the bell jar from top to bottom. Then, after passing through the second abutment plate and the first abutment plate, the helium flows into the concave area of ​​the first vibrator and finally fills the entire inner cavity of the outer cover. Then, the plug is inserted into the exhaust port, and the screw cap is tightened, and the gas needle is pulled out to complete the gas injection process. Then, the sealant gluing process is performed on the outside of the one-way gas valve to improve the sealing performance. The plug and the sealing rubber ring of this embodiment are coated with grease to enhance the air tightness.

[0022] It is obvious to those skilled in the art that the utility model can be changed in many ways, and such changes are not considered to be out of the scope of the utility model. All such modifications obvious to those skilled in the art will be included in the scope of the claims.

Claims

1. An explosion-proof indoor omnidirectional ceiling antenna, comprising an outer cover, a first vibrator, a second vibrator and a feeder connection, wherein the feeder connection is electrically connected to the two vibrators at the same time, and an insulating block is sandwiched between the first vibrator and the second vibrator, characterized in that: The outer cover comprises a base plate and a bell-shaped cover which are sealed to each other. The feeder wiring is arranged to penetrate the base plate and the penetration is sealed. The outer cover is filled with inert gas. A one-way gas injection port and an exhaust port are provided on the outer cover. A plug is sealed in the exhaust port.

2. The explosion-proof indoor omnidirectional ceiling antenna according to claim 1, characterized in that: The inner surface of the base plate is provided with a plurality of first abutment plates distributed in a circular array and relatively protruding, the inner surface of the bell-shaped cover is provided with a plurality of second abutment plates distributed in a circular array and relatively protruding, the first abutment plates and the second abutment plates abut against the upper and lower sides of the first oscillator, the inner surface of the bell-shaped cover is also provided with a plurality of third abutment plates distributed in a circular array and relatively protruding, all of the third abutment plates abut against the circumferential outer wall of the second oscillator.

3. The explosion-proof indoor omnidirectional ceiling antenna according to claim 2, characterized in that: A one-way air injection port is arranged at the center of the bell-shaped cover, and a one-way air valve and a sealant covering the outside of the one-way air valve are arranged in the one-way air injection port; an exhaust port is arranged at the center of the bottom plate, and a feeder connection is arranged to pass through the plug.

4. The explosion-proof indoor omnidirectional ceiling antenna according to claim 3, characterized in that: An air injection pipe extending toward the interior of the second vibrator is arranged on the inner side of the bell-shaped jar and at the location of the one-way air injection port.

5. The explosion-proof indoor omnidirectional ceiling antenna according to claim 3, characterized in that: A stud tube is arranged on the outside of the bottom plate and located at the exhaust port. A screw cap is screwed on the stud tube. The screw cap can abut the plug against the exhaust port. The power feed connection is arranged to pass through the screw cap.

6. The explosion-proof indoor omnidirectional ceiling antenna according to claim 4, characterized in that: The bottom plate is provided with an inner concave portion which is recessed toward the first vibrator.

7. The explosion-proof indoor omnidirectional ceiling antenna according to claim 2, characterized in that: The bottom plate and the bell-shaped cover are fixedly connected to each other by bolts, and a sealing rubber ring is provided at the joint surface of the two, and the cross section of the sealing rubber ring is L-shaped.

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