Longitudinal water-blocking radio frequency coaxial cable

Abstract

The utility model belongs to the technical field of wires and cables, and particularly relates to a longitudinal water-blocking radio frequency coaxial cable, which comprises an inner conductor, an insulating layer, a shielding layer and a sheath layer which are sequentially sleeved from inside to outside, the inner conductor, the insulating layer, the shielding layer and the sheath layer are coaxially arranged, and a first bonding layer is arranged between the inner conductor and the insulating layer; a second bonding layer is arranged between the insulating layer and the shielding layer; and a third bonding layer is arranged between the shielding layer and the sheath layer. According to the utility model, the inner conductor, the insulating layer, the shielding layer and the sheath layer are bonded pairwise through the bonding layer, air gaps do not exist, liquid such as water vapor, moisture and water can be effectively prevented from further diffusing into the cable after the liquid exists, longitudinal sealing and water blocking are realized, and the service life of the cable is prolonged. And the whole cable is prevented from penetrating and influencing the quality and performance indexes of the whole cable.

Description

Technical Field

[0001] The utility model relates to the technical field of wires and cables, in particular to a longitudinally water-blocking radio frequency coaxial cable. Background Art

[0002] RF coaxial cable is a cable specifically designed for transmitting RF signals. It reduces signal loss and interference and is widely used in wireless communications, broadcast television, data transmission, satellite communications, and test equipment. It consists of two concentric conductors, with the conductors and insulation sharing a common axis, capable of transmitting high-frequency signals or energy within the radio frequency range. RF coaxial cable insulation is composed of polyolefin-insulated copper wire (aluminum wire, alloy wire) conductors. The outer conductor, a ring-shaped conductor (which forms the shielding layer), is surrounded by an inner layer of insulation material. The outer conductor is typically formed, welded, and corrugated from metal strip; it can also be constructed from aluminum tubes or braided structures. The entire cable is then sheathed in a polyolefin sheath.

[0003] However, in the existing technology, there is an air gap between the insulating material and the outer conductor. This air gap structure will penetrate the entire cable longitudinally, resulting in poor sealing. Once liquids such as water vapor, moisture or moisture enter the cable from the joint, these liquids will penetrate the entire cable along the air gap. Since the RF coaxial cable sheath has good sealing performance, the moisture that enters cannot evaporate or volatilize, and will remain in the cable for a long time, seriously affecting the performance and quality of the product. Utility Model Content

[0004] The technical problem to be solved by the present invention is: in order to solve the technical problem in the prior art that the sealing is poor and liquids such as water vapor, moisture or moisture are easily present in the longitudinal air gap, the present invention provides a longitudinal water-blocking RF coaxial cable with very good sealing, which prevents moisture and water from penetrating and can achieve longitudinal water blocking.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a longitudinal water-blocking radio frequency coaxial cable, which includes: an inner conductor, an insulating layer, a shielding layer and a sheath layer sequentially arranged from the inside to the outside, wherein the inner conductor, the insulating layer, the shielding layer and the sheath layer are coaxially arranged;

[0006] A first adhesive layer is provided between the inner conductor and the insulating layer;

[0007] A second adhesive layer is provided between the insulating layer and the shielding layer;

[0008] A third adhesive layer is provided between the shielding layer and the jacket layer.

[0009] The specific technical effects are: the inner conductor and the insulating layer are bonded by the first adhesive layer, so that the inner conductor and the insulating layer are tightly fitted without any air gap; the insulating layer and the shielding layer are bonded by the second adhesive layer, so that the insulating layer and the shielding layer are tightly fitted without any air gap; the shielding layer and the sheath layer are bonded by the third adhesive layer, so that the shielding layer and the sheath layer are tightly fitted without any air gap, and the water vapor, moisture, water and other liquids can be effectively blocked from further diffusion into the cable, thereby achieving longitudinal sealing and water blocking, and preventing the water from penetrating the entire cable and affecting the quality and performance indicators of the entire cable product.

[0010] Furthermore, the third adhesive layer is a hot melt adhesive layer.

[0011] The specific technical effect is that the hot melt adhesive can quickly solidify on the outer surface of the shielding layer to bond the shielding layer to the sheath layer.

[0012] Furthermore, the thickness of the third adhesive layer ranges from 0.1 mm to 0.3 mm.

[0013] The specific technical effect is: considering the cost and adhesion issues, the thickness within this range is selected, which can not only maintain good adhesion between the shielding layer and the sheath layer but also can be used at a low cost.

[0014] Furthermore, the inner conductor, the first adhesive layer, the insulating layer, the second adhesive layer, the shielding layer, the third adhesive layer and the jacket layer are coaxially arranged.

[0015] Furthermore, the shielding layer is in the form of longitudinally wrapped metal strips welded together.

[0016] The specific technical effect is that after the shielding layer is drawn through the tooling die, it can fit tightly to the insulating layer, and after being instantly heated by the online high-frequency induction heating equipment, the outer skin of the insulating layer can be more tightly bonded to the inner surface of the shielding layer to form a sealed structure.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The inner conductor and the insulation layer are bonded by a first adhesive layer, so that the inner conductor and the insulation layer are tightly fitted without any air gap. The insulation layer and the shielding layer are bonded by a second adhesive layer, so that the insulation layer and the shielding layer are tightly fitted without any air gap. The shielding layer and the sheath layer are bonded by a third adhesive layer, so that the shielding layer and the sheath layer are tightly fitted without any air gap. In the event of water vapor, moisture, water and other liquids, it can effectively block their further diffusion into the cable, achieve longitudinal sealing and water blocking, and prevent them from penetrating the entire cable and affecting the quality and performance indicators of the entire cable product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in connection with the drawings and embodiments.

[0020] Fig. 1 It is the radial section structure schematic drawing of the utility model;

[0021] Fig. 2 It is the axial explosion structure schematic drawing of the utility model.

[0022] In the figure: 1, inner conductor;2, first adhesive layer;3, insulating layer;4, second adhesive layer;5, shielding layer;6, third adhesive layer;7, sheath layer. Specific implementation

[0023] The utility model will be further described in detail in connection with the drawings. These drawings are all simplified schematic diagrams, and only illustrate the basic structure of the utility model in a schematic manner, therefore, it only shows the structure related to the utility model.

[0024] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the features limited as "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0025] In the description of the utility model, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanically connected, or it can be electrically connected;It can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0026] As Figs. 1-2The figure shows a preferred embodiment of the present invention. In this embodiment, a longitudinally water-blocking radio frequency coaxial cable comprises: an inner conductor 1, an insulating layer 3, a shielding layer 5, and a sheath layer 7 sequentially arranged from the inside to the outside, wherein the inner conductor 1, the insulating layer 3, the shielding layer 5, and the sheath layer 7 are coaxially arranged; a first adhesive layer 2 is provided between the inner conductor 1 and the insulating layer 3; a second adhesive layer 4 is provided between the insulating layer 3 and the shielding layer 5; and a third adhesive layer 6 is provided between the shielding layer 5 and the sheath layer 7.

[0027] Therefore: the inner conductor 1 and the insulating layer 3 are bonded by the first adhesive layer 2, so that the inner conductor 1 and the insulating layer 3 are tightly fitted without any air gap; the insulating layer 3 and the shielding layer 5 are bonded by the second adhesive layer 4, so that the insulating layer 3 and the shielding layer 5 are tightly fitted without any air gap; the shielding layer 5 and the sheath layer 7 are bonded by the third adhesive layer 6, so that the shielding layer 5 and the sheath layer 7 are tightly fitted without any air gap, and the water vapor, moisture, water and other liquids can be effectively blocked from further diffusion into the cable, thereby realizing longitudinal sealing and water blocking, and preventing the water from penetrating the entire cable and affecting the quality and performance indicators of the entire cable product.

[0028] In this embodiment, the first adhesive layer 2 is formed by mixing an adhesive and an insulating material, and the volume ratio of the adhesive to the insulating material is in a range of 1:9 to 1:1.

[0029] As a result: the inner conductor 1 and the insulating layer 3 can be tightly fitted together without any air gap, the sealing is good, and longitudinal water blocking can be achieved. Considering the adhesion and cost issues, the volume proportion of the adhesive in the mixture can be adjusted according to different application scenarios and costs. For example, in situations where high-strength bonding is required, the volume proportion of the adhesive is increased; and in situations where higher insulation performance is required, the volume proportion of the adhesive is reduced. Generally, adhesive glue is expensive, and ordinary insulating polyethylene materials are relatively cheap, so costs can be controlled while ensuring adhesion performance.

[0030] In this embodiment, the second adhesive layer 4 is formed by mixing an adhesive and an insulating material, and the volume ratio of the adhesive to the insulating material is in a range of 1:9 to 1:1.

[0031] As a result: the insulating layer 3 and the shielding layer 5 can be tightly fitted together without air gaps, and the sealing is good, which can achieve longitudinal water blocking. Considering the adhesion and cost issues, the volume proportion of the adhesive in the mixture can be adjusted according to different application scenarios and costs. For example, in situations where high-strength bonding is required, the volume proportion of the adhesive is increased; and in situations where higher insulation performance is required, the volume proportion of the adhesive is reduced; generally, adhesive glue is expensive, and ordinary insulating polyethylene materials are relatively cheap, so costs can be controlled while ensuring adhesion performance.

[0032] Specifically, the adhesive material in the first adhesive layer 2 and the second adhesive layer 4 is usually EVA (ethylene-vinyl acetate copolymer) resin material, and the insulating material is usually polyethylene material.

[0033] Preferably, the commercial manufacturer of the adhesive material is DuPont, the glue name is SURLYN, and the brand is 1652SR.

[0034] Preferably, the insulating material is commercially available from Dow, and the polyethylene is low-density polyethylene with the grades CX1253 and CX 7540.

[0035] In this embodiment, the third adhesive layer 6 is hot melt adhesive.

[0036] Therefore, the hot melt adhesive can quickly solidify on the outer surface of the shielding layer 5 and can adhere to the sheath layer 7, thereby achieving sealing through the shielding layer 5, thereby achieving the sealing performance of the RF cable and achieving longitudinal water blocking of the RF coaxial cable.

[0037] In this embodiment, the thickness of the third adhesive layer 6 is in the range of 0.1 mm to 0.3 mm.

[0038] Therefore, considering the cost and adhesion issues, the thickness within this range is selected, which can ensure good adhesion between the shielding layer 5 and the sheath layer 7 while being used at a low cost.

[0039] In this embodiment, the inner conductor 1 , the first adhesive layer 2 , the insulating layer 3 , the second adhesive layer 4 , the shielding layer 5 , the third adhesive layer 6 and the jacket layer 7 are coaxially arranged.

[0040] In this embodiment, the shielding layer 5 is in the form of longitudinally wrapped metal strips welded together.

[0041] Therefore: after being pulled through the tooling mold, the shielding layer 5 can fit tightly to the second adhesive layer 4, and after being instantly heated by the online high-frequency induction heating equipment, the second adhesive layer 4 arranged outside the insulating layer 3 can be more tightly bonded to the inner surface of the shielding layer 5 to form a sealing structure.

[0042] The processing method of the present utility model is as follows:

[0043] The first adhesive layer 2 is arranged outside the inner conductor 1 and is used to bond the inner conductor 1 and the insulation layer 3; the second adhesive layer 4 is arranged outside the insulation layer 3, the shielding layer 5 is in the form of longitudinal welding of a metal strip, which is tightly attached to the outside of the second adhesive layer 4 after being drawn by a tooling die and is instantaneously heated by an online high-frequency induction heating device, and the second adhesive layer 4 can bond the insulation layer 3 and the shielding layer 5; after the high-frequency induction heating device, the cable is coated with a layer of hot melt adhesive (i.e. the third adhesive layer 6) with a thickness of 0.1mm-0.3mm on the outer periphery of the shielding layer 5 by a hot melt adhesive coating device, and the third adhesive layer 6 can be quickly solidified on the outer surface of the shielding layer 5; then the cable is placed into a sheathing machine device, the sheathing machine is heated to 150℃-200℃, and the sheathing material at 150℃-200℃ is extruded and coated on the outside of the third adhesive layer 6 to form the sheath layer 7, and since the temperature of 150℃-200℃ rapidly melts the hot melt adhesive, after the cable with the sheath layer 7 is passed through a cooling water tank, the solidified hot melt adhesive can tightly bond the shielding layer 5 and the sheath layer 7, so that the entire cable is longitudinally sealed and water blocked.

[0044] In summary, compared with the prior art, the utility model has the beneficial effects that:

[0045] The inner conductor 1 and the insulation layer 3 are bonded by the first adhesive layer 2, so that the inner conductor 1 and the insulation layer 3 are tightly attached without air gap, the insulation layer 3 and the shielding layer 5 are bonded by the second adhesive layer 4, so that the insulation layer 3 and the shielding layer 5 are tightly attached without air gap, and the shielding layer 5 and the sheath layer 7 are bonded by the third adhesive layer 6, so that the shielding layer 5 and the sheath layer 7 are tightly attached without air gap, which can effectively block the further diffusion of water vapor, moisture, water and other liquids into the cable, realize longitudinal sealing and water blocking, and prevent the penetration of the entire cable to affect the product quality and performance index of the entire cable product.

[0046] The above-mentioned ideal embodiments of the utility model are for inspiration, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the utility model. The technical scope of the utility model is not limited to the contents in the specification, and must be determined by the scope of claims.

Claims

1. A longitudinally water-blocking radio frequency coaxial cable, characterized in that: include: An inner conductor (1), an insulating layer (3), a shielding layer (5), and a sheath layer (7) are sequentially sleeved from the inside out, wherein the inner conductor (1), the insulating layer (3), the shielding layer (5), and the sheath layer (7) are coaxially arranged; A first adhesive layer (2) is provided between the inner conductor (1) and the insulating layer (3); A second adhesive layer (4) is provided between the insulating layer (3) and the shielding layer (5); A third adhesive layer (6) is provided between the shielding layer (5) and the sheath layer (7).

2. The longitudinally water-blocking radio frequency coaxial cable according to claim 1, characterized in that: The third adhesive layer (6) is a hot melt adhesive layer.

3. The longitudinally water-blocking radio frequency coaxial cable according to claim 2, characterized in that: The thickness of the third adhesive layer (6) ranges from 0.1 mm to 0.3 mm.

4. The longitudinally water-blocking radio frequency coaxial cable according to claim 1, wherein: The inner conductor (1), the first adhesive layer (2), the insulating layer (3), the second adhesive layer (4), the shielding layer (5), the third adhesive layer (6) and the jacket layer (7) are coaxially arranged.

5. The longitudinally water-blocking radio frequency coaxial cable according to claim 1, characterized in that: The shielding layer (5) is in the form of longitudinally wrapped metal strips welded together.

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