A coaxial cable

Abstract

This utility model relates to the field of cable technology, and provides a coaxial cable, comprising: a conductor, an insulating cylinder, a shield, and a sheath arranged sequentially from the inside to the outside along the radial direction of the coaxial cable; wherein, the shield comprises a first conductive strip, a braided portion, a plating layer, and a second conductive strip arranged sequentially from the inside to the outside along the radial direction of the coaxial cable, and the first conductive strip, the braided portion, the plating layer, and the second conductive strip are electrically connected. The shield can prevent signal leakage from the conductor and prevent signal transmission of the conductor from being affected by electromagnetic interference and radio frequency interference; the first conductive strip and the braided portion are arranged on the inner side of the plating layer, and the second conductive strip is arranged on the outer side of the plating layer to improve the mechanical tensile strength of the shield and the entire coaxial cable, making the shield less prone to breakage and ensuring the stability of the electrical transmission of the coaxial cable.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a coaxial cable. Background Technology

[0002] In the field of communications, coaxial cables serve to transmit signals. With the rapid development of the communications industry, the applications of coaxial cables are becoming increasingly diverse. While ensuring the basic electrical performance of coaxial cables, users are also placing higher demands on their mechanical strength. Currently, most technologies use tin-coated copper wires as the shielding for coaxial cables. However, during mechanical tensile testing, this shielding is prone to breakage, compromising the mechanical strength of the coaxial cable and affecting its signal transmission quality. Utility Model Content

[0003] This invention provides a coaxial cable to solve the problems of low mechanical tensile strength and easy breakage of the shield in existing coaxial cables, which makes it difficult to guarantee the electrical transmission quality of the coaxial cable. This invention provides a coaxial cable in which, in the radial direction, the coaxial cable includes, from the inside out, a conductor, an insulating cylinder, a shield, and a sheath.

[0004] The shielding body includes a first conductive strip, a braided portion, a plating layer, and a second conductive strip arranged sequentially from the inside to the outside along the radial direction of the coaxial cable, and the first conductive strip, the braided portion, the plating layer, and the second conductive strip are electrically connected to each other.

[0005] According to the present invention, a coaxial cable is provided, wherein the braided portion includes a first braided layer, a second braided layer and a third braided layer arranged sequentially from the inside to the outside along the radial direction of the coaxial cable.

[0006] According to the coaxial cable provided by this utility model, the first braided layer is a tin-plated copper-clad steel wire layer; and / or...

[0007] The second braided layer is a galvanized steel wire layer; and / or,

[0008] The third braided layer is a tin-plated copper alloy wire layer.

[0009] According to the coaxial cable provided by this utility model, the diameters of the single filaments in the first braided layer, the second braided layer, and the third braided layer are respectively 0.08mm~0.15mm; and / or,

[0010] The first braided layer, the second braided layer, and the third braided layer each have 4 to 9 strands; and / or,

[0011] The pitches of the first braided layer, the second braided layer, and the third braided layer are 4mm to 20mm, respectively.

[0012] According to the present invention, a coaxial cable is provided, wherein the braided portion has a plurality of braided holes, and the plating layer covers the outer wall surface of the braided portion and fills at least part of the braided holes.

[0013] According to the present invention, a coaxial cable further includes at least one layer of polytetrafluoroethylene (PTFE) raw material tape between the insulating cylinder and the shielding body, and the PTFE raw material tape is wound around the outer wall of the insulating cylinder.

[0014] According to the present invention, the number of layers of the polytetrafluoroethylene raw material tape is 1 to 8.

[0015] According to the present invention, a coaxial cable is provided, wherein the insulating cylinder is a polytetrafluoroethylene (PTFE) insulating cylinder, and the material compression ratio of the PTFE insulating cylinder is 400:1 to 4500:1.

[0016] According to the present invention, the first conductive strip and / or the second conductive strip are polyester copper alloy strips or polyester aluminum alloy strips.

[0017] According to the present invention, a coaxial cable is provided, wherein the sheath is a polyvinyl chloride sheath.

[0018] This invention provides a coaxial cable with a shield positioned between an insulating cylinder and a sheath to prevent signal leakage from the conductor and to prevent electromagnetic interference and radio frequency interference from affecting the signal transmission of the conductor, thus ensuring the signal transmission quality of the conductor. The shield comprises a first conductive strip, a braided section, a plating layer, and a second conductive strip arranged sequentially from the inside to the outside along the radial direction of the coaxial cable. The first conductive strip is tightly fitted to the insulating cylinder, and the second conductive strip is tightly fitted to the plating layer to ensure the flatness of the inner and outer surfaces of the shield, thereby guaranteeing the stability of the standing wave of the coaxial cable. By providing the conductive first conductive strip and braided section inside the plating layer and the second conductive strip outside the plating layer, the mechanical tensile strength of the shield and the entire coaxial cable is improved, making the shield less prone to breakage and ensuring the electrical transmission quality of the coaxial cable. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1This is a cross-sectional view of the coaxial cable provided by this utility model.

[0021] Figure label:

[0022] 1. Conductor; 2. Insulating cylinder; 3. Shielding body; 31. First conductive strip; 32. Braided section; 321. First braided layer; 322. Second braided layer; 323. Third braided layer; 33. Plating layer; 34. Second conductive strip; 4. Polytetrafluoroethylene raw material tape; 5. Sheath. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0024] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] The following is combined with Figure 1 The present invention provides a detailed description of a coaxial cable through specific embodiments and application scenarios.

[0028] like Figure 1 As shown, this utility model provides a coaxial cable. In the radial direction of the coaxial cable, the coaxial cable includes a conductor 1, an insulating cylinder 2, a shield 3, and a sheath 4 arranged sequentially from the inside to the outside.

[0029] The shield 3 includes a first conductive strip 31, a braided portion 32, a plating layer 33, and a second conductive strip 34 arranged sequentially from the inside to the outside along the radial direction of the coaxial cable, and the first conductive strip 31, the braided portion 32, the plating layer 33, and the second conductive strip 34 are electrically connected to each other.

[0030] Specifically, such as Figure 1 As shown, the insulating cylinder 2 is extruded over the outside of the conductor 1 to prevent the conductor 1 from contacting surrounding metal parts or other electrical conductors, avoiding the risk of short circuits or electric shock, while protecting the conductor 1 from physical damage and ensuring that the conductor 1 can stably transmit electrical signals. The shield 3 is located on the outer wall of the insulating cylinder 2. The shield 3 is used for grounding to prevent signal leakage from the conductor 1, and to prevent interference from electromagnetic interference and radio frequency interference from affecting the signal transmission of the conductor 1, effectively guiding these interferences to the ground, thereby protecting the signal inside the conductor 1 from external interference. The shield 3 is wrapped inside the sheath 5 to achieve insulation isolation of the coaxial cable through the sheath 5, providing physical protection for the entire coaxial cable.

[0031] Optionally, conductor 1 is a fine copper wire with a silver-plated surface. The silver layer and copper wire are subjected to a tight-fitting and stretching process using a drawing die. The die ratio is greater than 1.07, and the silver layer and copper wire are repeatedly pressed and stretched using more than 10 drawing dies to ensure a tight bond between them. Optionally, the uniformity tolerance of the silver layer is within ±0.02μm to ensure optimal electrical conductivity of conductor 1.

[0032] Traditional coaxial cables typically have a shield 3 composed of copper and tin, with tin-plated copper wire covering the outer surface of the insulating cylinder 2. During tensile strength tests, the tin-plated copper wire is prone to breakage, failing to meet the tensile test requirements. However, the coaxial cable provided by this invention... Figure 1As shown, the first conductive strip 31 is wound around the outside of the insulating cylinder 2. The first conductive strip 31, the braided portion 32, the plating layer 33, and the second conductive strip 34 are connected sequentially from the inside to the outside along the radial direction of the coaxial cable. By providing the first conductive strip 31 and the braided portion 32 on the inner side of the plating layer 33, and providing the second conductive strip 34 on the outer side of the plating layer 33, the shielding body 3 is less prone to breakage while meeting the basic electromagnetic interference resistance performance of the shielding body 3, thus significantly improving the mechanical strength of the entire coaxial cable.

[0033] Furthermore, the first conductive strip 31 is strip-shaped. The first conductive strip 31 is wound around the outer wall of the insulating cylinder 2, completely covering the outer surface of the insulating cylinder 2, thereby ensuring the flatness of the inner surface of the shield 3. The first conductive strip 31 and the insulating cylinder 2 are tightly fitted, ensuring the stability of the standing wave of the coaxial cable. Similarly, the second conductive strip 34 is strip-shaped. The second conductive strip 34 is wound around the outer wall of the plating layer 33 to completely cover the outer surface of the plating layer 33, thereby improving the flatness of the outer surface of the shield 3, further ensuring the stability of the standing wave of the coaxial cable, and thus ensuring the stability of the electrical signal transmission of the coaxial cable.

[0034] In some embodiments, such as Figure 1 As shown, the braided section 32 includes a first braided layer 321, a second braided layer 322, and a third braided layer 323 arranged sequentially from the inside to the outside along the radial direction of the coaxial cable.

[0035] The first braided layer 321 is located on the surface of the first conductive strip 31, and the third braided layer 323 is located inside the plating layer 33. By setting three braided layers between the first conductive strip 31 and the plating layer 33, the mechanical tensile strength of the shield 3 is improved, ensuring that the shield 3 is not easily broken, thereby ensuring the stability of the signal transmission of the conductor 1.

[0036] In some specific embodiments, the first braided layer 321 is a tin-plated copper-clad steel wire layer. Compared to tin-plated copper wire, tin-plated copper-clad steel wire has higher tensile strength and advantages such as a small coefficient of linear expansion, light weight, and good weldability. While meeting basic conductivity requirements, the tin-plated copper-clad steel wire layer can improve the overall mechanical strength of the coaxial cable.

[0037] In some specific embodiments, the second braided layer 322 is a galvanized steel wire layer. Galvanized steel wire has good toughness and strength, and can withstand a certain degree of mechanical damage. While meeting basic conductivity requirements, the galvanized steel wire layer and the tin-plated copper-clad steel wire layer work together to double guarantee the mechanical strength of the entire coaxial cable, preventing the plating layer 33 from breaking during tensile testing.

[0038] In some specific embodiments, the third braided layer 323 is a tin-plated copper alloy wire layer. The tensile strength of the copper alloy wire can reach over 350 MPa. Tin plating on the copper alloy wire enhances its electrical conductivity and improves the overall conductivity of the shield 3, thereby more effectively blocking electromagnetic interference and radio frequency interference.

[0039] Furthermore, when the first braided layer 321 is a tin-plated copper-clad steel wire layer, the second braided layer 322 is a galvanized steel wire layer, and the third braided layer 323 is a tin-plated copper alloy wire layer, the strength of the second braided layer 322 is greater than that of the first braided layer 321 and the third braided layer 323. The second braided layer 322 mainly plays a tensile role in the entire braided section 32. At the same time, since the first braided layer 321 and the third braided layer 323 contain copper, and copper has good conductivity, the first braided layer 321 and the third braided layer 323 mainly play a conductive role in the entire braided section 32. The braided section 32 formed by the above-mentioned specific materials, through the cooperation between each layer, has both excellent conductivity and tensile strength. On the basis of ensuring the overall mechanical strength of the braided section 32, the diameter of the single wire, the number of strands, and the pitch of each braided layer can be appropriately increased or decreased according to the flatness of the surface of the braided section 32, so as to further make the surface of the braided section 32 flatter and ensure that the electrical signal of the coaxial cable can be transmitted smoothly.

[0040] Optionally, the monofilament diameters of the first braided layer 321, the second braided layer 322, and the third braided layer 323 are 0.08 mm to 0.15 mm, respectively. The number of plies in the first braided layer 321, the second braided layer 322, and the third braided layer 323 are 4 to 9, respectively. The pitch of the first braided layer 321, the second braided layer 322, and the third braided layer 323 is 4 mm to 20 mm, respectively.

[0041] Specifically, the braided portion 32 has a plurality of braiding holes. The plating layer 33 covers the outer wall surface of the braided portion 32 and fills at least part of the braiding holes.

[0042] Optionally, plating layer 33 is a tin plating layer. The tin plating layer is plated onto one side of the third braided layer 323 facing the second conductive strip 34, and gradually penetrates into the braid holes of the entire braided section 32.

[0043] The tin plating layer can be an antioxidant alloy tin bar with a tin purity of 99.95% or higher. The antioxidant alloy tin bar can be plated onto the side of the third braided layer 323 facing the second conductive strip 34 by electroplating or hot-dip plating. Simultaneously, due to the good fluidity of the antioxidant alloy tin bar, it can penetrate into the braided holes of the braided section 32, thereby increasing the connection strength between the multiple braided layers of the braided section 32 and ensuring the electrical performance of the shield 3.

[0044] When the third braided layer 323 is a tin-plated copper alloy wire layer, the bonding force between the tin-plated layer and the third braided layer 323 is relatively large, and the tin-plated layer forms a dense plating layer 33 on the side of the third braided layer 323 facing the second conductive strip 34 to improve the shielding effect.

[0045] Furthermore, the coaxial cable also includes at least one layer of polytetrafluoroethylene (PTFE) raw material tape 4. The PTFE raw material tape 4 is wound around the outer wall of the insulating cylinder 2. By wrapping the insulating cylinder 2 with PTFE raw material tape 4, the impedance uniformity of the conductor 1 is improved, ensuring that the signal will not be reflected or distorted due to impedance mismatch during transmission, thereby improving the signal quality of the conductor 1 and increasing the signal transmission efficiency.

[0046] Preferably, 1 to 8 layers of polytetrafluoroethylene raw material tape 4 can be wound around the outer wall of the insulating cylinder 2 to further ensure the impedance uniformity of the conductor 1.

[0047] Optionally, the insulating cylinder 2 is a polytetrafluoroethylene (PTFE) insulating cylinder. The PTFE insulating cylinder has a material compression ratio of 400:1 to 4500:1 to ensure rapid and stable molding under pressure, thus guaranteeing that the PTFE insulating cylinder has strong compressive strength and good insulation performance.

[0048] Optionally, the first conductive strip 31 and / or the second conductive strip 34 are polyester copper alloy strips or polyester aluminum alloy strips. Polyester copper alloy strips or polyester aluminum alloy strips have the characteristic of low dielectric constant, which can ensure the stability of the standing wave of the coaxial cable and ensure that the shielding body 3 has better anti-electromagnetic interference performance.

[0049] Optionally, sheath 5 is a polyvinyl chloride (PVC) sheath. PVC sheaths have good high-temperature resistance, corrosion resistance, water resistance, and electrical insulation properties, and can provide insulation, waterproofing, moisture protection, and corrosion protection for the internal structure of the coaxial cable.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coaxial cable, characterized in that, In the radial direction of the coaxial cable, the coaxial cable includes a conductor, an insulating cylinder, a shield, and a sheath arranged sequentially from the inside to the outside; The shielding body includes a first conductive strip, a braided portion, a plating layer, and a second conductive strip arranged sequentially from the inside to the outside along the radial direction of the coaxial cable, and the first conductive strip, the braided portion, the plating layer, and the second conductive strip are electrically connected to each other.

2. The coaxial cable according to claim 1, characterized in that, The braided section includes a first braided layer, a second braided layer, and a third braided layer arranged sequentially from the inside to the outside along the radial direction of the coaxial cable.

3. The coaxial cable according to claim 2, characterized in that, The first braided layer is a tin-plated copper-clad steel wire layer; and / or, The second braided layer is a galvanized steel wire layer; and / or, The third braided layer is a tin-plated copper alloy wire layer.

4. The coaxial cable according to claim 2, characterized in that, The monofilament diameters of the first braided layer, the second braided layer, and the third braided layer are respectively 0.08 mm to 0.15 mm; and / or, The first braided layer, the second braided layer, and the third braided layer each have 4 to 9 strands; and / or, The pitches of the first braided layer, the second braided layer, and the third braided layer are 4mm to 20mm, respectively.

5. The coaxial cable according to claim 1, characterized in that, The braided portion has a plurality of braided holes, and the plating covers the outer wall surface of the braided portion and fills at least a portion of the braided holes.

6. The coaxial cable according to claim 1, characterized in that, At least one layer of polytetrafluoroethylene (PTFE) raw material tape is also included between the insulating cylinder and the shielding body, and the PTFE raw material tape is wrapped around the outer wall of the insulating cylinder.

7. The coaxial cable according to claim 6, characterized in that, The polytetrafluoroethylene raw material tape has 1 to 8 layers.

8. The coaxial cable according to claim 1, characterized in that, The insulating cylinder is a polytetrafluoroethylene (PTFE) insulating cylinder, and the material compression ratio of the PTFE insulating cylinder is 400:1 to 4500:

1.

9. The coaxial cable according to claim 1, characterized in that, The first conductive strip and / or the second conductive strip are polyester copper alloy strips or polyester aluminum alloy strips.

10. The coaxial cable according to claim 1, characterized in that, The sheath is a polyvinyl chloride sheath.

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