Radio frequency antenna device suitable for complex industrial site

Abstract

The utility model discloses a radio frequency antenna device suitable for a complex industrial site, which comprises an outer protective shell with windows on the periphery, an inner protective shell with a hole in the center arranged in the outer protective shell, and a sealing O-shaped ring arranged between the front end of the outer wall of the inner protective shell and the inner wall of the outer protective shell. After the inner-layer protective shell and the outer-layer protective shell are pressed tightly through the pressing ring, the pressing ring is fixed to the outer-layer protective shell through the fixing bolt, the spring antenna is sealed in a center opening of the inner-layer protective shell in a pouring mode through pouring sealant, and the front end of the spring antenna is fixedly connected with the antenna extension line. According to the radio frequency antenna device disclosed by the utility model, a double-layer protection scheme of combining the outer-layer protection shell and the inner-layer protection shell is adopted for the radio frequency antenna, so that the radio frequency antenna device can well meet the protection requirements of complex industrial sites, and has the advantages of good protection effect and small size.

Description

Technical Field

[0001] The utility model belongs to the field of radio frequency antennas, and particularly relates to a radio frequency antenna device suitable for complex industrial sites such as strong vibration, impact, water immersion, etc. in this field. Background Art

[0002] With the development of wireless communication technology, the application of wireless sensors and wireless sensor network technology in the industrial field is becoming increasingly widespread. The sensors applied to the industrial field are mainly used for equipment status monitoring and on-site environmental monitoring of industrial sites. Under certain complex industrial environmental conditions, after the wireless sensor is installed, its application environment will have severe working conditions such as strong vibration, abnormal impact on the sensor by foreign objects during the operation of industrial equipment or during industrial production, environmental water spray or water immersion with pressure, etc. The above complex application conditions require that the wireless sensor must be effectively protected to meet the requirements of long-term stable and reliable operation.

[0003] The protection of the sensor housing itself can use a metal material, which is relatively easy to design and implement. However, the transmission of wireless sensor signals needs to rely on the radio frequency antenna to radiate electromagnetic wave signals into the external space environment. Therefore, the protection design of the radio frequency antenna cannot use a completely sealed metal structure, and the protection scheme of the radio frequency antenna is the key point of the protection design of the wireless sensor.

[0004] At present, the wireless sensor antenna protection schemes applied to the above complex environment fields mostly adopt small-size flexible rubber rod antennas, small-size ceramic antennas with strong adaptability, etc., or use protective hydraulic hoses to encapsulate and protect ordinary antennas. The small-size flexible rubber rod antenna has certain anti-vibration and waterproof capabilities, but its anti-collision ability is insufficient. For slight collisions, the rubber rod has a certain elasticity and can realize the rebound of the antenna after being deformed by an external force. However, for medium-strength collisions, it will cause damage to the antenna. The small-size ceramic antenna, due to its smaller size, although the probability of being externally collided will be greatly reduced, for medium-strength collisions, it will also cause damage to the antenna. The antenna encapsulated with a protective hydraulic hose has the defect of large volume. Although it can withstand medium-strength collisions to a certain extent, its volume is large, the probability of being abnormally collided is high, and the antenna extension wire in the hose will swing with the hose under the vibration state, which is likely to cause the antenna extension wire to fail.

[0005] In summary, the current antenna protection schemes all have defects such as insufficient anti-collision ability and poor adaptability in a long-term strong vibration environment. The failure of the antenna will have an adverse impact on the reliable operation of the wireless sensor network. At present, there is no technology and method to realize a small-sized radio frequency antenna with high protection ability for the complex industrial environment field. Summary of the Utility Model

[0006] The technical problem to be solved by the present utility model is to provide a radio frequency antenna device that can be well applied to complex industrial environments for a long time, and an assembly method thereof, which has the characteristics of small volume, little influence on the outward radiation transmission of radio frequency signals, strong anti-collision and anti-vibration capabilities, and good waterproof performance.

[0007] The present utility model adopts the following technical solutions:

[0008] A radio frequency antenna device applicable to complex industrial sites, the improvement lies in: including an outer protective housing with windows on all sides, an inner protective housing with a central opening is arranged inside the outer protective housing, a sealing O-ring is arranged between the front end of the outer wall of the inner protective housing and the inner wall of the outer protective housing. After pressing the inner protective housing and the outer protective housing tightly through a compression ring, the compression ring is fixed on the outer protective housing through fixing bolts. The spring antenna is potted in the central opening of the inner protective housing through potting glue, and the front end of the spring antenna is fixedly connected with the antenna extension wire.

[0009] Further, the outer protective housing adopts a cage-like structure and is made of stainless steel.

[0010] Further, the inner protective housing is cylindrical and is made of non-metallic insulating material.

[0011] Further, a sealing gasket is installed on the front end of the outer wall of the outer protective housing.

[0012] Further, a pipe thread interface is arranged on the front end of the outer wall of the outer protective housing.

[0013] Further, a radial groove for accommodating the sealing O-ring is arranged on the front end of the outer wall of the inner protective housing.

[0014] Further, the antenna extension wire is connected to the spring antenna by welding.

[0015] Further, the spring antenna is welded to the radio frequency antenna centrally installed and placed inside the inner protective housing, and the antenna extension wire extends out of the outer protective housing and is assembled and connected to the radio frequency circuit board.

[0016] An assembly method applicable to the above radio frequency antenna device, the improvement lies in that it includes the following steps:

[0017] Step 1, sleeved the sealing O-ring in the radial groove at the front end of the outer wall of the inner protective housing;

[0018] Step 2, apply silicone grease on the surface of the sealing O-ring, and install the inner protective housing into the outer protective housing;

[0019] Step 3, after pressing the inner protective housing and the outer protective housing tightly through a compression ring, then fixedly connect the compression ring and the outer protective housing through fixing bolts;

[0020] Step 4, put the sealing gasket on the sealing end face at the front end of the outer wall of the outer protective housing;

[0021] Step 5, weld and connect the spring antenna and the antenna extension wire;

[0022] Step 6, put the spring antenna into the central opening of the inner protective housing;

[0023] Step 7, pot the spring antenna in the central opening of the inner protective housing with potting glue;

[0024] Step 8, complete the assembly after the potting glue is completely cured.

[0025] The beneficial effects of the present utility model are as follows:

[0026] For the radio frequency antenna device disclosed by the present utility model, a double-layer protection scheme combining an outer protective housing and an inner protective housing is adopted for the radio frequency antenna, which can be well adapted to the protection requirements of complex industrial sites, and has the advantages of good protection effect and small volume. The outer protective housing with cage-shaped openings has little influence on the transmission of radio frequency signals, and can maximize the protection performance of the radio frequency antenna on the premise of ensuring the coverage range of the wireless sensor network.

[0027] The inner protective housing and the outer protective housing are sealed with a sealing O-ring, and the spring antenna is potted in the central opening of the inner protective housing with potting glue. These designs make the radio frequency antenna device disclosed by the present invention have the characteristics of good waterproof performance, strong anti-vibration ability and good adaptability. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the radio frequency antenna device disclosed in Embodiment 1 of the present invention.

[0029] Reference numerals: 1 - outer protective housing, 2 - inner protective housing, 3 - pressing ring, 4 - sealing O-ring, 5 - sealing gasket, 6 - spring antenna, 7 - antenna extension wire, 8 - fixing bolt, 9 - potting glue. Specific Embodiments

[0030] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model, and are not used to limit the present utility model.

[0031] Embodiment 1, as Figure 1As shown in the figure, this embodiment discloses a radio frequency antenna device applicable to complex industrial sites, which includes an outer protective housing 1 with openings on all sides. An inner protective housing 2 with a central opening is arranged inside the outer protective housing. A sealing O-ring 4 is arranged between the front end of the outer wall of the inner protective housing and the inner wall of the outer protective housing. After pressing the inner protective housing and the outer protective housing tightly through a compression ring 3, the compression ring is fixed on the outer protective housing through fixing bolts 8. The spring antenna 6 is potted in the central opening of the inner protective housing through potting glue 9 to ensure its anti-vibration performance. The front end of the spring antenna and the antenna extension wire 7 are fixedly connected by welding.

[0032] A double-layer protection structure is adopted to protect the radio frequency antenna. The outer protective housing adopts a cage-like structure and is made of stainless steel. As the first layer of protection for the radio frequency antenna, the openings in the outer metal protective housing can ensure that the radio frequency signal is not completely shielded, and the signal on the radio frequency antenna can form an effective propagation to the outside through penetration and diffraction. The hardness and anti-collision performance of the outer metal protective housing are relatively high, and it can withstand impacts from abnormal objects above medium strength. The inner protective housing is cylindrical and is made of a non-metallic insulating material with good strength and toughness. The inner protective housing is embedded in the outer metal protective housing, which can avoid being directly collided by external abnormal objects. Even if a small object collides with the inner protective housing at the opening of the outer metal protective housing, it will basically not cause damage to the inner protective housing.

[0033] When the inner cylindrical protective housing is installed in the outer metal protective housing, it is radially sealed by a sealing O-ring to ensure a high pressure-bearing and waterproof sealing ability. The inner cylindrical protective housing and the outer metal protective housing are connected and fixed by a compression ring to ensure strong anti-vibration performance after the overall installation.

[0034] A pipe thread interface is arranged at the front end of the outer wall of the outer protective housing. A sealing gasket 5 is installed on the front end of the outer wall of the outer protective housing. The outer metal protective housing is fixedly connected to the sensor protective housing in the form of a pipe thread interface and is waterproof sealed through a flat sealing gasket.

[0035] A radial groove for accommodating the sealing O-ring is arranged at the front end of the outer wall of the inner protective housing.

[0036] The radio frequency antenna adopts a small spring antenna to realize the outward radiation transmission of the radio frequency signal. The spring antenna is welded to a radio frequency antenna with an SMA connector or other connector forms. The radio frequency antenna is installed in the inner cylindrical protective housing in the center, and the antenna extension wire extends out of the outer protective housing and is assembled and connected to the radio frequency circuit board.

[0037] This embodiment also discloses an assembly method applicable to the above-mentioned radio frequency antenna device, which includes the following steps:

[0038] Step 1: Place the sealing O-ring in the radial groove at the front end of the outer wall of the inner protective housing.

[0039] Step 2: Apply an appropriate amount of silicone grease on the surface of the sealing O-ring, and then insert the inner protective housing into the outer protective housing.

[0040] Step 3: After pressing the inner protective housing and the outer protective housing tightly with a compression ring, fixedly connect the compression ring and the outer protective housing through fixing bolts to ensure that the inner protective housing is reliably fixed after being inserted into the outer protective housing.

[0041] Step 4: Place the sealing gasket on the sealing end face at the front end of the outer wall of the outer protective housing.

[0042] Step 5: Weld the spring antenna and the antenna extension wire to ensure a reliable connection.

[0043] Step 6: Insert the spring antenna into the central opening of the inner protective housing.

[0044] Step 7: Pot the spring antenna in the central opening of the inner protective housing with potting glue.

[0045] Step 8: After the potting glue is completely cured, the assembly is completed and can be connected to the RF module for use.

Claims

1. A radio frequency antenna device suitable for complex industrial sites, characterized in that: The invention comprises an outer protective shell with windows on all sides, an inner protective shell with a central opening arranged inside the outer protective shell, a sealing O-ring arranged between the front end of the outer wall of the inner protective shell and the inner wall of the outer protective shell, the inner protective shell and the outer protective shell are pressed together by a pressure ring, and then the pressure ring is fixed to the outer protective shell by fixing bolts, the spring antenna is potted in the central opening of the inner protective shell by potting glue, and the front end of the spring antenna is fixedly connected to the antenna extension line.

2. The radio frequency antenna device suitable for complex industrial sites according to claim 1, characterized in that: The outer protective shell adopts a cage-like structure and is made of stainless steel.

3. The radio frequency antenna device suitable for complex industrial sites according to claim 1, characterized in that: The inner protective shell is cylindrical and is made of non-metallic insulating material.

4. The radio frequency antenna device suitable for complex industrial sites according to claim 1, characterized in that: A sealing gasket is installed on the front end of the outer wall of the outer protective shell.

5. The radio frequency antenna device suitable for complex industrial sites according to claim 1, characterized in that: A pipe thread interface is arranged at the front end of the outer wall of the outer protective shell.

6. The radio frequency antenna device suitable for complex industrial sites according to claim 4, characterized in that: A radial groove for accommodating a sealing O-ring is arranged at the front end of the outer wall of the inner protective shell.

7. The radio frequency antenna device suitable for complex industrial sites according to claim 6, characterized in that: The antenna extension wire is connected to the spring antenna by welding.

8. The radio frequency antenna device suitable for complex industrial sites according to claim 1, characterized in that: The spring antenna is welded and connected to the radio frequency antenna centrally installed in the inner protective shell, and the antenna extension line extends out of the outer protective shell and is assembled and connected with the radio frequency circuit board.

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