CN201210417Y

CN201210417Y - Safe flexible frequency variable cable

Info

Publication number: CN201210417Y
Application number: CNU2008200342367U
Authority: CN
Inventors: 崔康; 施永久; 李小琴
Original assignee: Jiangsu Zhongmei Cable Group Co Ltd
Current assignee: Jiangsu Zhongmei Cable Co Ltd
Priority date: 2008-04-18
Filing date: 2008-04-18
Publication date: 2009-03-18
Anticipated expiration: 2018-04-18

Abstract

The utility model provides a safe soft variable-frequency cable; the cable has strong voltage withstanding impact force and is able to withstand the pulse voltage, has excellent flexibleness and wear-resisting property and also has environmental performance and wide market demand and prospect of development. The safe soft variable-frequency cable in the utility model comprises a conductor composed by a main cable core and a ground wire core, a conductor insulating layer, a shielding layer and a jacket; the shielding layer is divided into three layers structure, orderly is a first shielding layer of extruded semi-conductive rubber, a second shielding layer weaved by tinned copper wire and a third shielding layer lapped by aluminum foil. The conductor utilizes annealed delicate copper wire soft stranded conductor; the conductor insulating layer utilizes ethylene propylene diene insulating layer; the jacket utilizes polybutadiene rubber jacket.

Description

The soft type frequency-changing cable of safety

Technical field

The utility model relates to a kind of frequency-changing cable, especially a kind of frequency-changing cable that adopts rubber as insulation and sheath, and its function admirable, safe in utilization, low-temperature pliability is good, conveniently moving.

Background technology

Because the high speed development of industrial automation speed-adjusting and control system, frequency control is because of advantages such as it have low noise, low energy consumption, speed governing is stable, low cruise is reliable, more and more be subjected to machinery, control the favor of industries such as gold, and also arise at the historic moment for it provides the frequency-changing cable of power, and because its have strong interference immunity, advantage that the phase sequence symmetry is good, reliable has obtained using widely.

Existing frequency-changing cable, as two kinds of frequency-changing cables introducing respectively among Chinese patent CN 2042006132.3 and the CN 200620126831.4, its structure all is a rigid structure, as shown in Figure 1, it comprises conductor 1, crosslinked polyetylene insulated 2, copper strips shielding 3, polyvinyl chloride or anticorrosion polyolefin plastics sheath 4.There is following shortcoming in this structure:

1, the occasion that frequently moves at needs, when using on steel mill's rotary machine, this kind frequency-changing cable is because of quality is hard, flexibility is poor, not flexible;

2, there is the wrapped shortcoming that place's electric field is concentrated of putting up in the copper strips shielding, and interference free performance is poor;

If when 3 sheath materials were subjected to the external force damage, extraneous corrosive medium can be invaded cable inside by damaged part, corrosion copper strips and insulating material, the electrical safety performance and the useful life of reducing cable.

Summary of the invention

The purpose of this utility model is to overcome the deficiency of above-mentioned prior art, and a kind of safe soft type frequency-changing cable is provided, and this cable has stronger proof voltage impulsive force, the pulse voltage in the time of standing the high speed frequency conversion, and flexibility, anti-wear performance are good.The performance that has environmental protection simultaneously, the market demand and DEVELOPMENT PROSPECT are wide.

The purpose of this utility model realizes by following measure:

A kind of safe soft type frequency-changing cable, it comprises conductor, insulating layer of conductor and screen and the sheath of being made up of master core and ground core, it is characterized in that described screen is divided into three-decker, be followed successively by first screen that extrudes semi-conductive rubber, the secondary shielding and the 3rd wrapped screen of aluminium foil of tinned copper wire braiding.

The flexible conductor that conductor adopts the soft copper wire of annealing to be twisted into; Lead insulating barrier and adopt the Ethylene Propylene Terpolymer insulating barrier; Sheath adopts the polybutadiene rubber sheath.

The used rubber insulation material of the utility model is an ethylene propylene diene rubber, have excellent electric performance such as low insulation resistance low dielectric loss, anti-corona,, good springiness good with ageing-resistant performance, the physical and chemical performance that flexibility is good, moisture absorption is little are widely used in electric wire.Because of its combination property is suitable with crosslinked polyethylene, substitute the preferred material of crosslinked polyethylene as the converter cable insulation so become.And have a better resistance to bend(ing) energy than crosslinked polyetylene insulated, bending radius can narrow down to 3-5 doubly, and excellent spring more can give cable the frequent crooked characteristic that moves.

Protective material adopted soft type semiconductor rubber in first screen of the present utility model was held concurrently, the shielding layer structure any surface finish that this extrudes continuously, greatly homogenizing surface field, the wrapped position of putting up that has not only overcome the copper strips shielding exists electromagnetic field to concentrate the big shortcoming of interference, and can intercept inside and outside phase mutual interference, reach desired shield effectiveness, thereby improved greatly the useful life of cable.The structure that extrudes has continuously also played the effect of protective layer; under the impaired situation of oversheath; can resist the invasion of extraneous corrosive medium; prevent that cable core from contacting with extraneous corrosive medium; reduce chemical corrosion and electrochemical corrosion; play the normal effect of using of protection cable internal structure, improved the electrical safety performance of cable.And first screen will be with each insulated wire cores to be fixed in the semiconductor rubber by extruding technology, insulated wire cores has also been played positioning action.Thereby changed in original frequency-changing cable, owing to adopt non-closely fixing filling tape to fill, caused scurrying the position mutually between the insulated wire cores, made the performance of cable better.

Secondary shielding layer of the present utility model is the tinned copper wire braiding structure.It selects for use electric conductivity good, and following four effects are played in the tinned copper wire braiding that the good intensity of flexibility is high:

1, further homogenizing external electrical field, inside and outside electromagnetic the interpenetrating of shielding reduces the phase mutual interference;

2, guarantee the flexibility of cable, overcome the shortcoming of copper strips shielding resistance to bend(ing) difference;

3, strengthened the resistance to tension of cable;

4, be subjected to inside and outside boundary highfield to do the time spent, the induced current in excluding on the outer shielding layer promptly uses as drain wire.

The 3rd screen of the present utility model water blocking layer of holding concurrently is the wrapped structure of aluminium foil.Adopt thickness wrapped beyond the braiding copper wire less than the aluminium foil of 0.05mm; remove the shield effectiveness that further improves cable; strengthen beyond the interference free performance of cable; can also stop the infiltration of moisture content to cable; the protection tincopper fuse wire braided armor is not subjected to the corrosion of moisture content and hazardous medium, with the conductive security of protection cable insulation core and the normal use of inner two layers of shielding construction.

Sheath material of the present utility model is the polybutadiene rubber of low smoke and low halogen, intensity height, good springiness, and the internal structure of protection cable is not subjected to the infringement of external environment condition, improves the bending property and the usage safety performance of cable.

The utility model construction of cable is characterized as: the soft stranded conductor of the soft copper wire of annealing+three big three little rubber insulation master cores and ground core+semiconductive rubber extrude the wrapped shielding+rubber sheath of layer+tinned copper wire braiding+aluminium foil.Not only have the good advantage of softness, and have the characteristic of low cigarette, low halogen, environmental protection, reduced pollution environment.Main insulation core and ground core adopt the structure of 3+3, three master cores are isosceles triangle and arrange, three ground wires are evenly distributed in three master core outer rim spaces, thereby when having overcome single cored structure cable and laying side by side and uneven shortcoming such as three pole reactor of three big minor structure cables, electric capacity, resistance, heat radiation.Owing to adopted the sheath material of the rubber of good springiness, adopted three layers of composite shielding structure again, given the utility model cable following advantage as insulation:

1, the cable security performance is good, and anti-extraneous corrosive nature is good.

2, good in anti-interference performance, dielectric loss little, lay conveniently;

3, flexibility is good, crooking ability is strong, is particularly suitable for the frequent crooked occasion that requires and uses;

4, the advantage of good, the environmental protection of water preventing ability.

Description of drawings

Fig. 1 is each layer structure chart of existing frequency-changing cable.

Fig. 2 is each layer structure chart of the utility model frequency-changing cable.

Embodiment

As Fig. 2, the insulation master core of cable of the present utility model adopts three big three minor structures with the ground core, comprise and adopt soft copper stranded master core 1 and ground core 3 as conductor, the outside extrudes the master core insulating barrier 2 that the Ethylene Propylene Terpolymer insulation forms, ground wire core insulation layer 4, three master cores 1 are the isosceles triangle arrangement during stranding, three ground cores 3 are evenly distributed on and also are the isosceles triangle arrangement in three master cores, the 1 outer rim space, first shielding, the 5 double sheaths that the semiconductive rubber extrudes, the double drain wire of tinned copper wire braiding of secondary shielding layer 6, the double water blocking layer of the wrapped do shielding of the aluminium foil of the 3rd screen 7, the 3rd screen 7 adopts thickness wrapped outside the braiding copper wire less than the aluminium foil of 0.05mm, the polybutadiene rubber sheath 8 that outermost layer extrudes.

Claims

1, a kind of safe soft type frequency-changing cable, it comprises conductor, insulating layer of conductor and screen and the sheath of being made up of master core and ground core, it is characterized in that described screen is divided into three-decker, be followed successively by first screen that extrudes semi-conductive rubber, the secondary shielding and the 3rd wrapped screen of aluminium foil of tinned copper wire braiding.

2,, it is characterized in that described conductor adopts the soft stranded conductor of the soft copper wire of annealing according to the described safe soft type frequency-changing cable of claim 1.

3,, it is characterized in that insulating layer of conductor adopts the Ethylene Propylene Terpolymer insulating barrier according to claim 1 or 2 described safe soft type frequency-changing cables.

4, according to the described safe soft type frequency-changing cable of claim 3, it is characterized in that the aluminium foil of the wrapped employing of described aluminium foil less than 0.05mm.

5,, it is characterized in that described sheath adopts the polybutadiene rubber sheath according to the described safe soft type frequency-changing cable of claim 4.