Double-sheath parallel radio frequency coaxial cable

Abstract

The invention discloses a double-sheath parallel radio frequency coaxial cable, which prolongs the actual service life of the cable, and ensures that the whole line connection is still reliable when adjacent cables partially deviate radially. The cable comprises an inner conductor which comprises a central conductor and outer circumferential conductors, and a plurality of wound outer circumferential conductors are arranged on the outer circumference of the central conductor; the inner conductor positioning sleeve comprises profiling outer peripheries profiled on the outlines of the exposed edges of the outer circumferential conductors, and all the profiling outer peripheries are connected to form a closed profiling positioning cavity; the inner layer insulation structure comprises a framework sleeve and an insulation filling layer, the framework sleeve comprises an inner cylinder, an outer cylinder and scattered connecting ribs, and the outer wall of the inner cylinder is connected with the inner wall of the outer cylinder through the connecting ribs; an outer conductor; and the sheath layer comprises an inner sheath and an outer sheath.

Description

Technical Field

[0001] The invention relates to the technical field of cable structures, in particular to a double-sheath parallel radio frequency coaxial cable. Background Art

[0002] Radio frequency coaxial cables are mainly used in the wired transmission parts of wireless mobile communications, cellular phones, microwave transmission, and broadcast communication systems.

[0003] The RF coaxial cable in the prior art is composed of a cylindrical inner conductor, a physical foam insulation layer, a corrugated copper tube outer conductor and an outer sheath. In actual use, when the coaxial cable is docked, the two sections of the cable need to be guided through a guide joint and then connected by plugging and pressing, so that the inner conductors of adjacent sections of the cable are connected to each other. During the actual connection, the inner conductor has a relatively small contact area due to its cylindrical structure, which can easily lead to deviations in the axial position of the joint during use, thereby causing maintenance failures of the connection. In addition, since the existing RF coaxial cables are all single-layer sheaths, the outer sheath is easy to wear, thereby causing damage to the internal structure, and the service life of the RF coaxial cable cannot reach the preset life. Summary of the invention

[0004] In view of the above problems, the present invention provides a double-sheath parallel radio frequency coaxial cable, which improves the actual service life of the cable and ensures that the entire line connection is still reliable when adjacent cables are partially radially offset.

[0005] A double-sheath parallel radio frequency coaxial cable, characterized in that it comprises:

[0006] The inner conductor comprises a central conductor and an outer circumferential conductor, wherein a plurality of outer circumferential conductors are arranged around the outer circumference of the central conductor;

[0007] An inner conductor positioning sleeve, comprising a contoured outer periphery conforming to the contour of the exposed edge of each outer circumferential conductor, all contoured outer peripheries are connected to form a closed contoured positioning cavity;

[0008] The inner insulating structure includes a skeleton sleeve and an insulating filling layer. The skeleton sleeve includes an inner tube, an outer tube, and scattered connecting ribs. The outer wall of the inner tube is connected to the inner wall of the outer tube through the connecting ribs.

[0009] Outer conductor;

[0010] and a sheath layer, which includes an inner sheath and an outer sheath;

[0011] The inner conductor is arranged in the contoured positioning cavity formed by the inner conductor positioning sleeve, each of the outer circumferential conductors is respectively positioned and inserted in the corresponding inner cavity area of ​​the contoured outer periphery, the center conductor is arranged at the center of the contoured positioning cavity, the outer periphery of the center conductor is respectively in contact with the corresponding position of the annular wall of the outer circumferential conductor at the corresponding position, the outer periphery of the inner conductor positioning sleeve is sleeved with the skeleton sleeve, the inner cavity of the skeleton sleeve is filled with the insulating filling layer, the outer cylinder of the skeleton sleeve is covered with the outer conductor, the outer periphery of the outer conductor is covered with the inner sheath, and the outer periphery of the inner sheath is covered with the outer sheath.

[0012] It is further characterized by:

[0013] The central conductor and the outer circumferential conductor are metal conductors of the same diameter;

[0014] The metal conductor is a conductor for transmitting electrical signals such as a copper tube or copper-clad aluminum;

[0015] The central conductor and the outer circumferential conductor are combined to form a 1+6 arrangement;

[0016] A gap is formed between the contoured outer periphery of the inner conductor positioning sleeve and the inner wall of the inner cylinder, so that a gap exists in the radial space between the inner conductor and the outer conductor, thereby improving the voltage resistance of the cable, reducing attenuation and increasing signal strength;

[0017] The outer conductor is a metal strip longitudinally wrapped and welded into a tubular structure, the outer conductor is sleeved on the outer wall of the outer tube, and the outer conductor and the inner conductor form an electromagnetic oscillation circuit to transmit electromagnetic;

[0018] The outer conductor is a metal wire braided outer conductor shielding layer, the outer conductor is sleeved on the outer wall of the outer cylinder, and the outer conductor and the inner conductor form an electromagnetic oscillation circuit to transmit electromagnetic.

[0019] After adopting the structure of the present invention, the structure of the inner conductor includes a central conductor and an outer circumferential conductor, and a plurality of wound outer circumferential conductors are arranged on the outer circumference of the central conductor, so that the inner conductor is formed by a plurality of groups of small-diameter cylindrical conductors connected in parallel, and the cross-sectional area of ​​the original single cylinder is divided into a plurality of groups of small-diameter cylindrical conductors. During the splicing process, the radial distance of the entire inner conductor becomes larger, and when adjacent cables are partially radially offset, the corresponding radial offset distance of the contact increases, thereby improving the reliability of the connection line; and an inner sheath and an outer sheath are sequentially arranged on the outer circumference of the outer conductor, and the double sheath structure improves the protection capability of the cable sheath layer, thereby improving the actual service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the inner conductor positioning sleeve corresponding to the present invention;

[0022] Figure 3 It is a structural schematic diagram of the inner insulating structure corresponding to the present invention;

[0023] The names corresponding to the serial numbers in the figure are as follows:

[0024] Inner conductor 10, center conductor 11, outer circumferential conductor 12, inner conductor positioning sleeve 20, contoured outer periphery 21, contoured positioning cavity 22, inner insulating structure 30, skeleton sleeve 31, insulating filling layer 32, inner tube 33, outer tube 34, connecting rib 35, outer conductor 40, inner sheath 50, outer sheath 60, gap portion 70. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] A double-sheathed parallel radio frequency coaxial cable, see Figure 1-Figure 3 , which includes an inner conductor 10, an inner conductor positioning sleeve 20, an inner insulating structure 30, an outer conductor 40, an inner sheath 50, and an outer sheath 60;

[0030] The inner conductor 10 includes a central conductor 11 and an outer circumferential conductor 12. A plurality of outer circumferential conductors 12 are arranged around the outer circumference of the central conductor 11.

[0031] The inner conductor positioning sleeve 20 comprises a contoured outer periphery 21 contoured to the exposed edge contour of each outer circumferential conductor, and all contoured outer peripheries 21 are connected to form a closed contoured positioning cavity 22;

[0032] The inner insulating structure 30 includes a skeleton sleeve 31 and an insulating filling layer 32 . The skeleton sleeve 31 includes an inner tube 33 , an outer tube 34 , and distributed connecting ribs 35 . The outer wall of the inner tube 33 is connected to the inner wall of the outer tube 34 through a plurality of connecting ribs 35 .

[0033] In a specific implementation, the central conductor 11 and the outer circumferential conductor 12 are metal conductors of the same diameter; the metal conductor is a copper tube, copper-clad aluminum or other conductor for transmitting electrical signals; the central conductor 11 and the outer circumferential conductor 12 are combined to form a 1+6 arrangement, that is, the inner conductor is formed by a central conductor 11 and six outer circumferential conductors 12 arranged around the outer circumference;

[0034] The inner conductor positioning sleeve 20 includes six contoured outer peripheries 21, and the six contoured outer peripheries 21 are connected to form a contoured positioning cavity 22 in the shape of a six-petal flower; each outer annular conductor 12 is respectively positioned and inserted in the corresponding inner cavity area of ​​the contoured outer periphery 21, and the center conductor 11 is arranged at the center of the contoured positioning cavity 22, and the outer periphery of the center conductor 11 is respectively fitted with the corresponding position of the annular wall of the outer annular conductor 12 at the corresponding position, and the adjacent outer annular conductors 12 are fitted and connected at tangent points, and the outer periphery of the inner conductor positioning sleeve 20 is sleeved with a skeleton sleeve 31, and the inner cavity of the skeleton sleeve 31 is filled with an insulating filling layer 32, and the outer cylinder 34 of the skeleton sleeve 31 is covered with an outer conductor 40, and the outer periphery of the outer conductor 40 is covered with an inner sheath 50, and the outer periphery of the inner sheath 50 is covered with an outer sheath 60.

[0035] In specific implementation, a gap portion 70 is formed between the contoured outer periphery 21 of the inner conductor positioning sleeve 20 and the inner wall of the inner tube 33, which allows the presence of the gap portion 70 in the radial space between the inner conductor 10 and the outer conductor 40, thereby improving the cable's voltage resistance, reducing attenuation and increasing signal strength.

[0036] In a specific implementation, the outer conductor 40 is a metal strip longitudinally wrapped and welded into a tubular structure. The outer conductor 40 is sleeved on the outer wall of the outer tube 34. The outer conductor 40 and the inner conductor 10 form an electromagnetic oscillation circuit to transmit electromagnetics.

[0037] Alternatively, the outer conductor 40 is a metal wire braided outer conductor shielding layer, and the outer conductor 40 is sleeved on the outer wall of the outer tube 34 . The outer conductor 40 and the inner conductor 10 form an electromagnetic oscillation circuit to transmit electromagnetics.

[0038] In a specific implementation, the insulating filling layer 32 is a high-foam polyethylene filling layer, which makes the inner insulation structure stable and reliable.

[0039] In specific implementation, the inner sheath 50 is a ceramic silicone rubber sheath, which has excellent fireproof, flame retardant, low smoke and non-toxic properties, and the extrusion molding process is simple. The residue after combustion is a hard ceramic shell. The hard shell does not melt or drip in a fire environment, and can withstand fire at a temperature of 950℃-1000℃ for 90 minutes, thereby enhancing the flame retardant and fireproof performance of the cable and having high safety and reliability.

[0040] The outer sheath 60 is made of low-smoke halogen-free polyolefin material; the sheath 40 has a fixing and protective effect on the cable body.

[0041] Its working principle is as follows: the structure of the inner conductor includes a central conductor and an outer circumferential conductor, and a plurality of wound outer circumferential conductors are arranged on the outer circumference of the central conductor, so that the inner conductor is formed by a plurality of groups of small-diameter cylindrical conductors connected in parallel, and the cross-sectional area of ​​the original single cylinder is divided into a plurality of groups of small-diameter cylindrical conductors. During the splicing process, the radial distance of the entire inner conductor becomes larger, and when adjacent cables are partially radially offset, the radial offset distance of the corresponding contact increases, thereby improving the reliability of the connection line; and an inner sheath and an outer sheath are sequentially arranged on the outer circumference of the outer conductor, and the double sheath structure improves the protection ability of the cable sheath layer, thereby improving the actual service life of the cable; in addition, since a gap portion is formed between the contoured outer periphery of the inner conductor positioning sleeve and the inner wall of the inner cylinder, a gap portion exists in the radial space between the inner conductor and the outer conductor, and the gap portion is in an air or vacuum state, and the relative dielectric constant of air (or vacuum) insulation is minimized, and the loss is minimized, thereby improving the cable withstand voltage performance, reducing attenuation and improving signal strength.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A double-sheathed parallel radio frequency coaxial cable, characterized in that: It includes: The inner conductor comprises a central conductor and an outer circumferential conductor, wherein a plurality of outer circumferential conductors are arranged around the outer circumference of the central conductor; An inner conductor positioning sleeve, comprising a contoured outer periphery conforming to the contour of the exposed edge of each outer circumferential conductor, wherein all contoured outer peripheries are connected to form a closed contoured positioning cavity; The inner insulating structure includes a skeleton sleeve and an insulating filling layer. The skeleton sleeve includes an inner tube, an outer tube, and scattered connecting ribs. The outer wall of the inner tube is connected to the inner wall of the outer tube through the connecting ribs. Outer conductor; and a sheath layer, which includes an inner sheath and an outer sheath; The inner conductor is arranged in the contoured positioning cavity formed by the inner conductor positioning sleeve, each of the outer circumferential conductors is respectively positioned and inserted in the corresponding inner cavity area of ​​the contoured outer periphery, the center conductor is arranged at the center of the contoured positioning cavity, the outer periphery of the center conductor is respectively in contact with the corresponding position of the annular wall of the outer circumferential conductor at the corresponding position, the outer periphery of the inner conductor positioning sleeve is sleeved with the skeleton sleeve, the inner cavity of the skeleton sleeve is filled with the insulating filling layer, the outer cylinder of the skeleton sleeve is covered with the outer conductor, the outer periphery of the outer conductor is covered with the inner sheath, and the outer periphery of the inner sheath is covered with the outer sheath.

2. The double-sheathed parallel radio frequency coaxial cable according to claim 1, characterized in that: The central conductor and the outer circumferential conductor are metal conductors with the same diameter.

3. The double-sheathed parallel radio frequency coaxial cable according to claim 2, characterized in that: The metal conductor is a conductor for transmitting electrical signals such as a copper tube or copper-clad aluminum.

4. The double-sheathed parallel radio frequency coaxial cable according to claim 2, characterized in that: The central conductor and the outer circumferential conductor are combined to form a 1+6 arrangement.

5. The double-sheathed parallel radio frequency coaxial cable according to claim 1, characterized in that: A gap portion is formed between the contoured outer periphery of the inner conductor positioning sleeve and the inner wall of the inner cylinder, so that a gap portion exists in the radial space between the inner conductor and the outer conductor.

6. The double-sheathed parallel radio frequency coaxial cable according to claim 1, characterized in that: The outer conductor is a metal strip longitudinally wrapped and welded into a tubular structure, and the outer conductor is sleeved on the outer wall of the outer tube.

7. The double-sheathed parallel radio frequency coaxial cable according to claim 1, characterized in that: The outer conductor is a metal wire braided outer conductor shielding layer, and the outer conductor is sleeved on the outer wall of the outer cylinder.

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