CN202013932U

CN202013932U - RF coaxial cable

Info

Publication number: CN202013932U
Application number: CN 201120100519
Authority: CN
Inventors: 赵要; 韩继忠; 包晓刚
Original assignee: CETC 23 Research Institute
Current assignee: CETC 23 Research Institute
Priority date: 2011-04-08
Filing date: 2011-04-08
Publication date: 2011-10-19
Anticipated expiration: 2021-04-08

Abstract

The utility model relates to coaxial cables, aims to overcome the shortcomings in the prior art, and provides an RF (Radio Frequency) coaxial cable capable of bearing high power and low standing wave. The RF coaxial cable is characterized in that a group of uniformly separated insulation spacers (3) are arranged between an outer conductor (2) and an inner conductor (4) for realizing insulation, and the insulation spacers (3) are ring-shaped elements which are closely sleeved on the inner conductor and can ensure the concentricity of the inner and the outer conductors. The RF coaxial cable is made of an insulating material with high mechanical strength and high softening temperature, and is combined with the unique discrete insulation spacer structures, so that the bearable temperature of the cable is greatly increased; and the insulation spacers between the inner and the outer conductors can play a support role, and even if after working for a long period of time, the cable cannot get soft, so that the insulation mechanical strength is improved, short circuit between the inner and the outer conductors is effectively avoided, and the transmission power of the cable is improved.

Description

A kind of radio frequency coaxial-cable

Technical field

The utility model relates to coaxial cable, relates in particular to the transmission feeder that needs to bear higher transmission power in the radio data system, for example is mainly used in the feeder line between the antenna and transmitter in the radio data system.

Technical background

Be applied at present that transmission feeder mainly is a SD-50-80 high density polyethylene (HDPE) insulating radio frequency coaxial cable in the radio data system, its structure is from the inside to surface successively: wrinkle copper pipe inner wire, T-shape high density polyethylene (HDPE) and air combined insulation, wrinkle copper pipe outer conductor, pe sheath.The insulation of T-shape high density polyethylene (HDPE) is tightly twined in the conductor with spiral form, and outer conductor is through vertical wrap molding, around argon arc welding, embossing are close to insulator, and outer conductor coats the layer of polyethylene sheath outward again.

In radio data system, cable lifting, 40 ℃ of ambient temperatures, heat radiation is good, under the traveling-wave mode Theoretical Calculation power average value near 70kW, but under the service condition of reality, the highest ambient temperature may reach 60 ℃, there is reflection (standing wave state just) certainly in the signal transmission, the power that cable can bear because cable is worked for a long time, is easy to make the insulation of T-shape high density polyethylene (HDPE) softening well below 70kW, cause the short circuit between the cable inner and outer conductor, form discharge, insulation breakdown, thus the use of cable is impacted.

The utility model content

Technical problem to be solved in the utility model is, at the deficiencies in the prior art, provides a kind of anti-high power to hang down the standing wave radio frequency coaxial-cable, satisfy transmission signals at standing wave less than 1.1,60 ℃ of ambient temperatures, but the cable through-put power is more than 100kW; Can satisfy the application demand of special occasions such as present radio data system.

For solving the problems of the technologies described above, technical solution of the present utility model is:

A kind of radio frequency coaxial-cable is made up of wrinkle copper inner wire 4, insulator, wrinkle copper outer conductor 2, oversheath 1 from inside to outside successively; It is characterized in that: being provided with at interval between outer conductor 2 and inner wire 4, uniform one group of insulation spacer 3 is used for realizing insulation; Described insulation spacer 3 is an annular component; This annular component closely is socketed on the inner wire 4 and can guarantees the concentricity of inner and outer conductor; Described annular component supports sufficient being formed by stacking by the annulus main body with at least three, and described support foot is centrosymmetric and is arranged on the annulus main body.

As a preference, support foot by one in the support of described insulation spacer 3 foot and form by 323 stacks of 321,322 and pad caps of two support columns; Described annulus main body is " C " shape, and described two support columns 321,322 are separately positioned on the gap two ends of " C " shape annulus main body; Described two support columns 321,322 close up back cover Upper gasket cap 323 and are used to make insulation spacer 3 to fit closely over inner wire 4; The correspondence position of described two support columns, 321,322 lateral surfaces and pad cap 323 inside is provided with the ledge structure of mutual clamping, is used to prevent that pad cap 323 from coming off.

Described insulation spacer 3 adopts polytetrafluoroethylene to make.

The utility model can bring following beneficial effect:

Adopt the insulating material of high mechanical properties and high softening temperature, in conjunction with unique discrete insulation spacer structure, can improve the cable withstand temperature greatly, insulation spacer plays a supporting role between internal and external conductor, even cable work for a long time can not soften yet, the insulation mechanical strength is improved, and has effectively avoided short circuit between the internal and external conductor, makes cable transmission power be improved.

Description of drawings

Fig. 1 is the construction of cable schematic diagram of a preferred embodiment of the present utility model;

Fig. 2 (a) is the schematic diagram to be assembled of the insulation spacer of a preferred embodiment of the utility model;

Fig. 2 (b) is that the support column of the insulation spacer of a preferred embodiment of the utility model merges the back schematic diagram;

Fig. 2 (c) is a back schematic diagram on the pad cap sleeve of insulation spacer of a preferred embodiment of the utility model;

Fig. 2 (d) is the schematic diagram that connects with inner wire of the insulation spacer of a preferred embodiment of the utility model;

Fig. 3 is the cutaway view of ledge structure of the mutual clamping of the support column of a preferred embodiment of the utility model and pad cap.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

As shown in Figure 1,1 is oversheath among the figure, and 2 is wrinkle copper outer conductor, and 3 is the teflon insulation pad, and 4 is wrinkle copper inner wire.Teflon insulation pad 3 is the annular component that closely is socketed on the inner wire 4 and guarantees the concentricity of internal and external conductor.

In conjunction with referring to Fig. 2 (a), Fig. 2 (b), Fig. 2 (c), Fig. 2 (d).

In the present embodiment, insulation spacer 3 is formed by stacking by annulus main body 31 and three support foots 32; Three support foots 32 are centrosymmetric and are arranged on the annulus main body 31.

For the ease of assembling, wherein support foot and form by support column 321,322 and 323 stacks of pad cap by one; Support column 321,322 is one-body molded with " C " shape annulus main body 31; Before unassembled, support column 321,322 separately, a gap (referring to Fig. 2 (a)) occurs naturally; From this opening position, insulation spacer 3 can be enclosed within on the inner wire, then support column 321,322 is closed up (referring to Fig. 2 (b)); Cover pad cap 323 (referring to Fig. 2 (c)) at last; Insulation spacer 3 just can closely be socketed on the inner wire 4 and can guarantee the concentricity (referring to Fig. 2 (d)) of inner and outer conductor.

The correspondence position of support column 321,322 lateral surfaces and pad cap 323 inside is provided with the ledge structure of mutual clamping, as the step among Fig. 3 3211 and 3221; This ledge structure can prevent that the pad cap from coming off.

In the present embodiment, insulation spacer 3 adopts polytetrafluoroethylene.This material outstanding feature in electric insulating quality is exactly that arc resistance is very high, can surpass 250 seconds, and carbonization does not take place; Secondly this material has enough mechanical performances, can remain to the mechanical performance under the room temperature quite high temperature.Can improve the power that bears of cable assembly, the inner wire that may occur when length high power cable assembly is used under the solution adverse circumstances arches upward and causes the mechanical damage of cable assembly, improves cable assembly long term reliability under high power transmission.The insulating material of similar polytetrafluoroethylene also has PFEP, polytrifluorochloroethylene, PVF and ethylene copolymer etc.

Claims

1. a radio frequency coaxial-cable is made up of wrinkle copper inner wire (4), insulator, wrinkle copper outer conductor (2), oversheath (1) from inside to outside successively; It is characterized in that: being provided with at interval between outer conductor (2) and inner wire (4), uniform one group of insulation spacer (3) is used for realizing insulation; Described insulation spacer (3) is an annular component; This annular component closely is socketed in the concentricity that inner and outer conductor was gone up and can be guaranteed to inner wire (4); Described annular component supports sufficient being formed by stacking by the annulus main body with at least three, and described support foot is centrosymmetric and is arranged on the annulus main body.

2. according to the described a kind of radio frequency coaxial-cable of claim 1, it is characterized in that: have a support foot to form in the support foot of described insulation spacer (3) by two support columns (321), (322) and a pad cap (323) stack; Described annulus main body is " C " shape, and described two support columns (321), (322) are separately positioned on the gap two ends of " C " shape annulus main body; Described two support columns (321), (322) are closed up back cover Upper gasket cap (323) and are used to make insulation spacer (3) to fit closely over inner wire (4); The inner correspondence position of described two support columns (321), (322) lateral surface and pad cap (323) is provided with the ledge structure of mutual clamping, is used to prevent that pad cap (323) from coming off.

3. according to claim 1 or 2 described a kind of radio frequency coaxial-cables, it is characterized in that: described insulation spacer (3) adopts polytetrafluoroethylene to make.