CN215342134U - Test cable - Google Patents

Abstract

The application provides a test cable, includes: the inner conductor, inner conductor periphery sets gradually insulating layer, inlayer shielding layer, outer shielding layer, interior sheath, first armor layer, second armor layer, third armor layer and fourth armor layer. Through the design of the inner shielding layer, the phase and amplitude changes caused by mechanical action between the inner shielding layer and the insulating layer under the condition of mechanical stress are effectively reduced. Simultaneously, adopt the design of armour structure, strengthened the mechanical properties's of test cable stability, the design of first armour layer wherein can reduce under the mechanical stress condition, produces the condition of relative movement between first armour layer and the interior sheath.

Description

Test cable

Technical Field

The application relates to the technical field of communication testing, in particular to a testing cable.

Background

A test cable is a type of cable used to connect a test instrument to a device under test. In the test process, the precision of the test cable needs to be ensured, the test cable is required to have a small and stable voltage standing wave ratio and a stable mechanical phase, and the stability of the curves of the mechanical phase and the voltage standing wave ratio is maintained in the shaking and bending processes.

However, common test cables in domestic markets generally have no protective structure and short service life, and under the stress conditions of frequent extrusion, distortion, bending and the like, the cables are easy to have mechanical phase shift, so that the amplitude change of insertion loss is caused, and the fluctuation generated by the test cables is brought into the test data of tested components, thereby directly influencing the accuracy of the test data.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present application proposes a test cable for solving the problem of mechanical phase shift under stress conditions such as frequent squeezing, twisting, and bending.

In order to solve the above problems, the present application discloses a test cable, comprising: the inner conductor, inner conductor periphery sets gradually insulating layer, inlayer shielding layer, outer shielding layer, interior sheath, first armor layer, second armor layer, third armor layer and fourth armor layer.

Further, the inner shielding layer is a flat metal strip longitudinal wrapping, and the outer shielding layer is of a metal wire weaving structure.

Furthermore, the insulating layer adopts low-density polytetrafluoroethylene to wrap the tape multilayer around the package structure.

Further, the inner protection layer is of a tubular structure and is made of high-temperature-resistant fluorinated ethylene propylene protection layer materials through extrusion molding.

Further, the first armor layer is a flat metal tape wrapping or a metal wire wrapping.

Further, the second armor layer is a metal wire braid layer.

Furthermore, the third armor layer adopts a low-density polytetrafluoroethylene wrapped tape wrapping structure.

Further, the fourth armor layer is a fiber silk braid layer.

Furthermore, a middle shielding layer is arranged between the inner shielding layer and the outer shielding layer.

Furthermore, the middle shielding layer is a low-density polytetrafluoroethylene wrapping tape wrapping bonding layer.

Further, a high-temperature-resistant polymer film wrapping layer is arranged between the third armor layer and the fourth armor layer.

Compared with the prior art, the embodiment of the application has the advantages that:

through the design of the inner shielding layer, the phase and amplitude changes caused by mechanical action between the inner shielding layer and the insulating layer under the condition of mechanical stress are effectively reduced. Simultaneously, adopt the design of armour structure, strengthened the mechanical properties's of test cable stability, the design of first armour layer wherein can reduce under the mechanical stress condition, produces the condition of relative movement between first armour layer and the interior sheath.

Drawings

In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a test cable according to the present embodiment;

fig. 2 is a schematic structural diagram of another test cable according to the present embodiment.

Wherein the reference numerals are:

an inner conductor 1; an insulating layer 2; an inner shield layer 3; an outer shielding layer 4; an inner sheath layer 5; a first armor layer 6; a second armor layer 7; a third armor layer 8; a fourth armor layer 9; an intermediate shield layer 11; a high temperature resistant polymer film wrapping 21.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Percentages not specifically stated in the present application are weight/mass percentages.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

For easy understanding, please refer to fig. 1 to 2, fig. 1 is a schematic structural diagram of a test cable according to an embodiment of the present disclosure; fig. 2 is a schematic structural diagram of another test cable in the embodiment of the present application.

The application provides a test cable, specifically can include: the cable comprises an inner conductor 1, wherein an insulating layer 2, an inner shielding layer 3, an outer shielding layer 4, an inner shielding layer 5, a first armor layer 6, a second armor layer 7, a third armor layer 8 and a fourth armor layer 9 are sequentially arranged on the periphery of the inner conductor 1.

The application provides a test cable, through inlayer shielding layer 3's design, reduced effectively under the mechanical stress condition, because of the phase place and the amplitude variation that mechanical action arouses between inlayer shielding layer 3 and insulating layer 2. Meanwhile, the armor structure design is adopted, the stability of the mechanical performance of the test cable is enhanced, and the design of the first armor layer 6 can reduce the situation that relative movement is generated between the first armor layer 6 and the inner sheath layer 5 under the mechanical stress condition.

Next, a test cable in the present exemplary embodiment will be further described.

As an example, the inner shielding layer 3 is a flat metal tape longitudinal wrapping, and the outer shielding layer 4 is a metal wire braided structure. More specifically, the inner conductor 1 is a single metal wire or a metal stranded wire, and preferably, the inner conductor 1 may be a silver-plated copper wire. And the inner shielding layer 3 and the outer shielding layer 4 which are arranged from inside to outside in sequence are the standard shielding structure of the embodiment. The inner shielding layer 3 is a flat metal strip longitudinal covering, preferably, the flat metal strip is a silver-plated copper flat strip, the width is not less than 0.5mm, the thickness is not less than 0.04mm, and the weaving density is not less than 90%. The outer shielding layer 4 is formed by weaving metal wires, preferably silver-plated copper wires, and the weaving density is not less than 90%, which can ensure the stability of the electrical performance and the mechanical performance of the test cable.

In other embodiments, an intermediate shielding layer 11 is disposed between the inner shielding layer 3 and the outer shielding layer 4. The middle shielding layer 11 is a low-density polytetrafluoroethylene wrapping tape wrapping bonding layer. More specifically, the shielding structure of the cable may also be a three-layer shielding structure, that is, an inner shielding layer 3, a middle shielding layer 11 and an outer shielding layer 4, which are sequentially arranged from inside to outside. The inner shielding layer 3 is a flat metal strip longitudinal covering, preferably, the flat metal strip is a silver-plated copper flat strip, the width is not less than 0.5mm, the thickness is not less than 0.04mm, and the weaving density is not less than 90%, and the flat metal strip longitudinal covering with the compact structure effectively reduces the relative movement between the shielding structure and the insulation under the mechanical stress condition. Middle shielding layer 11 is low density polytetrafluoroethylene around the band around the package tie coat for constitute more unified stable whole between inner shield layer 3 and the outer shielding layer 4, can effectually prevent vibration and crooked destruction to cable structure and shape, can not take place relative displacement when retesting the use repeatedly or mechanical bending, constitute more stable coaxial structure, guarantee that this cable keeps excellent mechanical steady looks characteristic under mechanical stress action conditions such as buckling, vibration, bending. The outer shielding layer 4 is formed by weaving metal wires, preferably silver-plated copper wires, and the weaving density is not less than 90% so as to ensure stable electrical and mechanical properties of the cable.

As an example, the insulating layer 2 adopts a low-density polytetrafluoroethylene tape multi-layer wrapping structure. More specifically, the multi-layer wrapping structure enables the outer diameter of the cable and the dielectric constant of the insulating layer 2 to be stable, and stable transmission of signals is guaranteed. Preferably, an ultra-low density polytetrafluoroethylene wrapping tape is adopted, and a fibrous microporous structure is uniformly and densely distributed in the wrapping tape, so that the ultra-low density polytetrafluoroethylene wrapping tape has the characteristics of low relative density, low dielectric loss, small influence caused by temperature and signal frequency change, excellent temperature resistance and the like, and preferably, the density is 0.4-0.7 g/cm 3. Moreover, because the low-density polytetrafluoroethylene wrapping tape has good heat resistance and very small thermal expansion coefficient, the dielectric constant of the insulating layer 2 changes very little under the condition of repeated bending test, so that the cable not only has extremely low attenuation and voltage standing-wave ratio, but also has a stable insulating structure.

As an example, the inner sheath 5 is a tubular structure and is made by extrusion molding of a high temperature resistant fluorinated ethylene propylene sheath layer material. More specifically, the inner sheath 5 is a tubular structure and is disposed at the periphery of the shielding structure, and plays a role in protecting the cable in a use environment. Preferably, the inner sheath 5 is made of a high temperature resistant fluorinated ethylene propylene sheath material by extrusion molding, so that the inherent mechanical strength and the use safety of the cable are ensured.

As an example, the first armor layer 6 is a flat metal tape wrapping or metal wire wrapping, the second armor layer 7 is a metal wire woven layer, the third armor layer 8 is a low-density polytetrafluoroethylene wrapping tape wrapping structure, and the fourth armor layer 9 is a fiber yarn woven layer. More specifically, this kind of from interior to exterior sets gradually first armor layer 6, second armor layer 7, third armor layer 8 and fourth armor layer 9's armor structural design, has improved the high resistant performance of turning round and life of test cable, makes things convenient for in the assembly test. The first armor layer 6 is a flat metal belt lapping layer or a metal wire lapping layer, preferably a stainless steel flat belt or a silver-plated copper wire lapping layer, so that relative movement between the armor structure and the inner protective layer 5 under the condition of mechanical stress is reduced, and the stability of the armor structure is ensured; the second armor layer 7 is a metal wire braided layer, preferably a silver-plated copper wire braided layer, so that the mechanical stability of the armor structure is further enhanced; the third armor layer 8 adopts a low-density polytetrafluoroethylene wrapped tape wrapping structure with excellent temperature resistance, so that the influence of a high-temperature test environment on an internal test cable is reduced, and a heat insulation protection effect is achieved; the fourth armor layer 9 is a fiber yarn braided layer, preferably, a polytetrafluoroethylene fiber yarn braided layer or a polyamide yarn braided layer is adopted for braiding, and the braided layer is of a tubular braided net structure, so that the whole test cable is softer, the enhancement protection effect on the test cable is achieved, and the environmental adaptability of the test cable is improved.

In other embodiments, a high temperature resistant polymer film wrapping 21 is disposed between the third armor layer 8 and the fourth armor layer 9. More specifically, the high temperature resistant polymer film wrapping layer 21 is a self-adhesive polyimide film wrapping layer, which can play a role in enhancing the high temperature resistance and heat insulation of the test cable.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A test cable, comprising: the cable comprises an inner conductor, wherein an insulating layer, an inner shielding layer, an outer shielding layer, an inner shielding layer, a first armor layer, a second armor layer, a third armor layer and a fourth armor layer are sequentially arranged on the periphery of the inner conductor;

and a high-temperature-resistant polymer film wrapping layer is arranged between the third armor layer and the fourth armor layer.

2. The test cable of claim 1, wherein the inner shield layer is a flat metal tape longitudinal wrap and the outer shield layer is a metal wire braid structure.

3. The test cable of claim 1, wherein the insulating layer is a low density polytetrafluoroethylene tape multi-layer tape.

4. The test cable of claim 1, wherein the inner sheath is of tubular construction and is extruded from a high temperature resistant fluorinated ethylene propylene sheath grade material.

5. The test cable of claim 1, wherein the first armor layer is a flat metal tape or wire wrap.

6. The test cable of claim 1, wherein the second armor layer is a metal wire braid.

7. The test cable of claim 1 wherein the third armor layer is of a low density polytetrafluoroethylene tape-wrapped construction.

8. The test cable of claim 1, wherein the fourth armor layer is a woven layer of fiber filaments.

9. Test cable according to any of claims 1-8, characterized in that an intermediate shield is arranged between the inner and outer shields.

10. The test cable of claim 9, wherein the intermediate shield layer is a low density polytetrafluoroethylene tape wrap adhesive layer.

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