High-temperature-resistant fireproof microwave cable

Abstract

The utility model relates to cable technical field especially a kind of high-temperature-resistant fireproof microwave cable, including outer sheath layer and several circumferential arrays of inner conductor, several the inner conductor are located the inside of outer sheath layer.The utility model has the advantages that: through three layers of fireproof design, the fireproof effect and high-temperature-resistant performance of cable are significantly improved.First, outer sheath layer adopts polyether ether ketone material, with excellent high-temperature-resistant and flame-retardant performance, provides first fireproof barrier for cable;Second, ceramic fiber braided layer is used in flame-retardant layer, can form stable heat insulation protection under high temperature, effectively prevents flame spread;Finally, inner insulation layer adopts ceramicized silicone rubber, forms firm fireproof barrier under high temperature, further enhances the fireproof performance of cable.In addition, ceramic aerogel is used in heat insulation layer, with extremely low thermal conductivity, can effectively isolate external high temperature, protect internal conductor and insulation layer.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a high-temperature resistant and fireproof microwave cable. Background Technology

[0002] Microwave cables are cables specifically designed for transmitting high-frequency signals (typically in the range of 300MHz to 300GHz), and are widely used in communications, radar, satellites, medical equipment, industrial heating, and scientific research. The core function of microwave cables is to transmit high-frequency electromagnetic signals efficiently and with low loss; therefore, their design and manufacturing must meet the special requirements of high-frequency signal transmission, such as low dielectric constant, low loss tangent, and high shielding effectiveness. In communications, microwave cables are used to connect base station antennas, satellite communication equipment, and microwave transmission systems, ensuring high-fidelity signal transmission. In radar systems, microwave cables are used to connect radar transmitters and antennas, transmitting high-frequency pulse signals for target detection and tracking.

[0003] Although microwave cables play a vital role in many fields, they still have certain shortcomings in fire resistance. Traditional microwave cables are usually made of flammable materials, such as polyvinyl chloride or rubber. These materials are prone to softening and combustion when exposed to high temperatures or fires, which can affect the normal transmission of data. Therefore, a high-temperature resistant and fire-resistant microwave cable is needed to solve these problems. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the aforementioned technical defects.

[0005] Therefore, one objective of this utility model is to provide a high-temperature resistant and fireproof microwave cable to solve the problems mentioned in the background art and overcome the shortcomings of the existing technology.

[0006] To achieve the above objectives, one embodiment of this utility model provides a high-temperature fire-resistant microwave cable, comprising an outer sheath and a plurality of inner conductors arranged in a circumferential array. The plurality of inner conductors are all located inside the outer sheath. An inner insulation layer is sleeved on the outer surface of the inner conductors. A flame-retardant layer is covered on the inner wall of the outer sheath. A heat insulation layer is disposed between the plurality of flame-retardant layers and the outer surface of the inner insulation layer. A filling layer is disposed between the inner wall of the heat insulation layer and the inner insulation layer. A shielding layer is sleeved on the outer surface of the heat insulation layer. The outer surface of the shielding layer is in contact with the inner wall of the flame-retardant layer.

[0007] Preferably, the outer sheath layer is made of polyetheretherketone (PEEK) from any of the above options.

[0008] Preferably, the flame-retardant layer is made of ceramic fiber woven layer, as described in any of the above schemes.

[0009] Preferably, the shielding layer is made of silver-plated copper braided layer, as described in any of the above schemes.

[0010] Preferably, the material of the heat insulation layer is ceramic aerogel, as described in any of the above schemes.

[0011] Preferably, the inner insulating layer is made of ceramicized silicone rubber, as described in any of the above schemes.

[0012] Preferably, the filling layer is made of foamed polyethylene, as described in any of the above schemes.

[0013] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0014] This utility model provides a high-temperature fire-resistant microwave cable that significantly improves its fire resistance and high-temperature performance through a three-layer fire-resistant design. First, the outer sheath is made of polyetheretherketone (PEEK), which has excellent high-temperature resistance and flame-retardant properties, providing the first line of fire protection. Second, the flame-retardant layer uses a ceramic fiber braided layer, which forms stable thermal insulation at high temperatures, effectively preventing the spread of flames. Finally, the inner insulation layer uses ceramicized silicone rubber, which ceramicizes at high temperatures to form a robust fire barrier, further enhancing the cable's fire resistance. In addition, the thermal insulation layer uses ceramic aerogel, which has extremely low thermal conductivity, effectively isolating external high temperatures and protecting the internal conductors and insulation layers. The shielding layer uses a silver-plated copper braided layer, providing excellent electromagnetic shielding and enhancing the cable's mechanical strength. The filling layer uses foamed polyethylene, which not only reduces the cable's weight but also improves its flexibility and signal transmission performance. Through the above design, this utility model not only achieves high-efficiency fire resistance and high-temperature resistance, but also takes into account the mechanical strength, signal transmission stability and installation convenience of the cable. It is suitable for harsh environments such as high temperature and high electromagnetic interference, and has broad application prospects. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of the assembly of this utility model;

[0016] Figure 2 This is a cross-sectional structural diagram of the assembly of this utility model.

[0017] In the diagram: 1-outer sheath layer, 2-inner conductor, 3-inner insulation layer, 4-flame retardant layer, 5-heat insulation layer, 6-filling layer, 7-shielding layer. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited thereto.

[0019] like Figures 1 to 2As shown, a high-temperature fire-resistant microwave cable includes an outer sheath layer 1 and several inner conductors 2 arranged in a circular array. The inner conductors 2 are all located inside the outer sheath layer 1. An inner insulation layer 3 is sleeved on the outer surface of the inner conductors 2. A flame-retardant layer 4 is covered on the inner wall of the outer sheath layer 1. A heat insulation layer 5 is provided between the flame-retardant layers 4 and the outer surface of the inner insulation layer 3. A filling layer 6 is provided between the inner wall of the heat insulation layer 5 and the inner insulation layer 3. A shielding layer 7 is sleeved on the outer surface of the heat insulation layer 5. The outer surface of the shielding layer 7 is in contact with the inner wall of the flame-retardant layer 4.

[0020] As an optional technical solution of this utility model, the outer sheath layer 1 is made of polyetheretherketone (PEEK). PEEK material has excellent high-temperature resistance (long-term operating temperature up to 250℃), flame retardancy (self-extinguishing), and mechanical strength. The high abrasion resistance and chemical corrosion resistance of PEEK material further improve the service life and reliability of the cable in harsh environments.

[0021] As an optional technical solution of this utility model, the flame-retardant layer 4 is made of ceramic fiber braided layer. The flame-retardant layer 4, made of ceramic fiber braided layer, has extremely high high temperature resistance (can withstand temperatures above 1000℃) and excellent flame-retardant effect. Ceramic fiber will not burn at high temperatures and can effectively isolate flames and prevent the spread of flames, providing a second fire barrier for the cable.

[0022] As an optional technical solution of this utility model, the shielding layer 7 is made of silver-plated copper braided layer. The silver-plated copper braided layer of shielding layer 7 has excellent electromagnetic shielding effect (shielding effectiveness ≥90dB), effectively preventing the influence of external electromagnetic interference (EMI) and radio frequency interference (RFI) on signal transmission. The silver plating layer also improves the conductivity and oxidation resistance of the conductor, further reducing signal loss.

[0023] As an optional technical solution of this utility model, the heat insulation layer 5 is made of ceramic aerogel. The heat insulation layer 5 using ceramic aerogel has extremely low thermal conductivity (approximately 0.015 W / m·K) and excellent high-temperature resistance (can withstand temperatures above 1000℃). Ceramic aerogel can effectively isolate external high temperatures, prevent heat from being conducted into the cable, protect the inner conductor and inner insulation layer, and at the same time reduce the weight of the cable.

[0024] As an optional technical solution of this utility model, the inner insulation layer 3 is made of ceramicized silicone rubber. The inner insulation layer 3, made of ceramicized silicone rubber, has excellent high-temperature resistance (can withstand temperatures above 1000℃) and fire resistance. At high temperatures, the ceramicized silicone rubber will ceramicize, forming a solid fire barrier to prevent the spread of flames and provide a third fire barrier for the cable.

[0025] As an optional technical solution of this utility model, the filler layer 6 is made of foamed polyethylene. Foamed polyethylene has a low dielectric constant and a low loss tangent, which can effectively reduce signal transmission delay and loss. The foamed structure also reduces the weight of the cable, improves its flexibility and ease of installation, and provides a certain degree of thermal insulation.

[0026] A high-temperature resistant and fireproof microwave cable, the working principle of which is as follows:

[0027] 1): First, the outer sheath layer 1 is made of polyetheretherketone material, which has excellent high temperature resistance and flame retardant properties, providing the first fire barrier for the cable.

[0028] 2): Secondly, the flame retardant layer 4 is made of ceramic fiber woven layer, which can form stable heat insulation protection at high temperature and effectively prevent the spread of flame.

[0029] 3): Finally, the inner insulation layer 3 is made of ceramicized silicone rubber, which forms a solid fire barrier at high temperature, further enhancing the fire resistance of the cable.

[0030] In summary, this high-temperature fire-resistant microwave cable significantly improves its fire resistance and high-temperature performance through a three-layer fire-resistant design. First, the outer sheath layer 1 uses polyetheretherketone (PEEK) material, which has excellent high-temperature resistance and flame-retardant properties, providing the first line of fire protection. Second, the flame-retardant layer 4 uses a ceramic fiber braided layer, which forms stable thermal insulation at high temperatures, effectively preventing the spread of flames. Finally, the inner insulation layer 3 uses ceramicized silicone rubber, which ceramicizes at high temperatures to form a robust fire barrier, further enhancing the cable's fire resistance. Furthermore, the thermal insulation layer 5 uses ceramic aerogel, which has extremely low thermal conductivity, effectively isolating external high temperatures and protecting the internal conductors and insulation layers. The shielding layer 7 uses a silver-plated copper braided layer, providing not only excellent electromagnetic shielding but also enhancing the cable's mechanical strength. The filling layer 6 uses foamed polyethylene, which not only reduces the cable's weight but also improves its flexibility and signal transmission performance. Through the above design, this utility model not only achieves high-efficiency fire resistance and high-temperature resistance, but also takes into account the mechanical strength, signal transmission stability and installation convenience of the cable. It is suitable for harsh environments such as high temperature and high electromagnetic interference, and has broad application prospects.

Claims

1. A high-temperature resistant and fire-resistant microwave cable, characterized in that: The device includes an outer sheath layer (1) and several inner conductors (2) arranged in a circular array. The inner conductors (2) are located inside the outer sheath layer (1). An inner insulation layer (3) is sleeved on the outer surface of the inner conductors (2). A flame-retardant layer (4) is wrapped around the inner wall of the outer sheath layer (1). A heat insulation layer (5) is provided between the flame-retardant layer (4) and the outer surface of the inner insulation layer (3). A filling layer (6) is provided between the inner wall of the heat insulation layer (5) and the inner insulation layer (3). A shielding layer (7) is sleeved on the outer surface of the heat insulation layer (5). The outer surface of the shielding layer (7) is in contact with the inner wall of the flame-retardant layer (4).

2. The high-temperature resistant and fireproof microwave cable according to claim 1, characterized in that: The outer sheath layer (1) is made of polyetheretherketone.

3. The high-temperature resistant and fire-resistant microwave cable according to claim 2, characterized in that: The flame-retardant layer (4) is made of ceramic fiber woven layer.

4. The high-temperature resistant and fireproof microwave cable according to claim 3, characterized in that: The shielding layer (7) is made of silver-plated copper braided layer.

5. A high-temperature resistant and fire-resistant microwave cable according to claim 4, characterized in that: The insulation layer (5) is made of ceramic aerogel.

6. A high-temperature resistant and fire-resistant microwave cable according to claim 5, characterized in that: The inner insulation layer (3) is made of ceramicized silicone rubber.

7. A high-temperature resistant and fire-resistant microwave cable according to claim 6, characterized in that: The filler layer (6) is made of foamed polyethylene.

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