CN2181011Y

CN2181011Y - Central pipe type special shape armored cable

Info

Publication number: CN2181011Y
Application number: CN 93245616
Authority: CN
Inventors: 刘中一
Original assignee: HUIYUAN OPTICAL CABLE FACTORY OF CHENGDU CITY
Current assignee: HUIYUAN OPTICAL CABLE FACTORY OF CHENGDU CITY
Priority date: 1993-11-30
Filing date: 1993-11-30
Publication date: 1994-10-26
Anticipated expiration: 2003-11-30

Abstract

The utility model relates to a central pipe type special-shaped armored cable, which is composed of an optical fiber (1), petroleum jelly (2), a central casing pipe (3), a reinforcing steel wire (4), a water-resistant strap (5), a longitudinal covering composite steel belt (6), and an outer sheath, wherein, the longitudinal covering composite steel belt forms an ellipse, the reinforcing steel wire (4) is arranged between the minor axis direction of the longitudinal covering composite steel belt and the outer sheath (7), and the water-resistant strap (5) and a central casing pipe are clamped tightly; meanwhile, in the long axis direction, a clearance (8) is between the longitudinal covering composite steel belt (6) and the central pipe sleeve. The utility model has the advantages that the periphery of the outer sheath is even, the outer diameter is small, the weight is light, and the mechanical physical property of every direction is basically kept in line. The utility model also overcomes the defect that when the temperature changes, the stretching phenomenon of the central casing tube (3) in the optic cable can occur.

Description

Central pipe type special shape armored cable

The utility model belongs to the manufacturing technology of communications optical cable.

All hinge formula, slotted core cables all are that steel strand wires or steel wire are placed the optical cable center at present, the shortcoming that this structure exists is in laying and using, because manpower and outside natural force are delivered to strengthening core by the interaction of the sheath and the cable heart, make optical fiber be subjected to bigger acting force, produce buckling phenomenon, influence transport property, because strengthening core, skeleton are in the center, utilization of space is low, make the volume of optical cable big, materials are many, weight is big, for laying of optical cable brought very big difficulty.In utility model patent " lightweight cable outer jacket structure ", strengthen steel wire and place in the external sheath layer, optical fiber is at the center of optical cable, and optical cable is under the situation of pure bending, optical cable answer vanishing, can directly bear the applied external force that acts on the optical cable, but weak point is: the steel wire of reinforcement place, external sheath layer thinner thickness are being arranged, no steel wire place sheath is thick, cause the oversheath materials to increase, had bigger stress in the sheath simultaneously, influenced the life-span of cable; Do not having the steel wire of reinforcement direction, the mechanical and physical performance of optical cable obviously has been weaker than the steel wire direction, and promptly obviously there is anisotropy in the performance of optical cable; Center sleeve is the PBT material, smooth surface, and when environment temperature changed, pipe box easily produced in optical cable and slides.

The purpose of this utility model is that the structure of optical cable is improved, and overcomes existing lightweight cable outer jacket uneven distribution, the mechanical and physical performance anisotropy, and pipe core easily produces the shortcoming of telescopic slide when being enclosed within temperature variation.Propose a kind of vertical cladding and close the optical cable that steel belt layer is an ellipse garden shape structure.

The cable that the steel band structure is closed in the vertical cladding of the ellipse garden shape that the utility model proposes by optical fiber (1), petroleum jelly (2), center sleeve (3), strengthen steel wire (4), the band that blocks water (5), the vertical cladding of ellipse garden shape and close steel band (6), oversheath (7), gap (8) and form.Vertical cladding is closed steel band (6) and is ellipse garden shape, it has changed traditional in the past garden shape, reinforcement steel wire (4) is placed on the vertical cladding of ellipse garden shape and closes between the minor axis and oversheath of steel band, have two, close steel belt layer (6) in the vertical cladding of this direction center sleeve (3) is tightly clamped, a gap (8) is arranged between steel belt layer (6) and the center sleeve and close in the vertical cladding of long axis direction.

Below in conjunction with description of drawings:

Fig. 1, central tubular abnormity armouring optical cable lateral junction composition:

Central tubular abnormity armouring optical cable, there is the optical fiber (1) of many primary coatings at the center, around optical fiber (1) is petroleum jelly (2) successively, center sleeve (3), belting layer (5) blocks water, steel band (6) layer and high density polyethylene external sheath layer (7) are closed in the vertical cladding of ellipse garden shape, closing between the short-axis direction of steel belt layer (6) and the oversheath (7) in the vertical cladding of ellipse garden shape has two reinforcement steel wires of vertically placing (4), the vertical cladding of ellipse garden shape is closed steel belt layer (6) center sleeve is clamped, and overcomes existing lightweight cable center sleeve (3) when temperature variation and produce flexible phenomenon in optical cable; Between the long axis direction of steel belt layer (6) and the center sleeve (3) certain clearance (8) is arranged and close in the vertical cladding of ellipse garden shape, under the effect of external force, it plays the effect of buffering, when only being subjected to bigger applied external force, just may influence optical fiber (1) by center sleeve, thereby improved the mechanical and physical performance of optical cable greatly in this direction, according to strengthening steel wire (4) diameter, the length of steel belt layer (6) is closed in the vertical cladding of the ellipse garden of adjustment that can be suitable shape, ratio between the minor axis, the major axis of steel belt layer (6) is closed in the vertical cladding of ellipse garden shape and the difference of minor axis all can between 1.0～3.0mm, make the plastic sheath thickness at steel wire place and the sheath thickness basically identical of other direction like this, overcome the weak link at steel wire place, make sheath be tending towards even again at whole optical cable garden Zhou Fangxiang, also reduce cable outer diameter and weight simultaneously, make cable configuration more compact, cost is lower.Steel belt layer (6) is closed in vertical cladding, and he can close steel band for the vertical cladding of embossing, also can make the vertical cladding of flat rubber belting and close steel band.

Central tubular abnormity armouring optical cable has overcome the shortcoming of lightweight cable, has kept the advantage that existing lightweight cable had.

Claims

1, a kind of central tubular abnormity armouring optical cable by optical fiber (1), petroleum jelly (2), center sleeve (3), strengthen steel wire (4), the band that blocks water (5), vertical cladding and close steel band (6), oversheath (7), gap (8) and form, it is characterized in that cable core (1) around successively the vertical cladding of petroleum jelly (2), center sleeve (3), the band that blocks water (5), ellipse garden shape close steel band (6) and high density polyethylene oversheath (7), the vertical cladding of ellipse garden shape is closed between the minor axis of steel band (6) and the oversheath (7) has one to strengthen steel wire (4), has the gap between its major axis and center sleeve.

2, central tubular abnormity armouring optical cable as claimed in claim 1 is characterized in that the major axis of steel belt layer (6) is closed in the vertical cladding of ellipse garden shape and the difference of minor axis is between 1.0～3.0mm.

3, central tubular as claimed in claim 1 abnormity armouring optical cable is characterized in that vertical cladding closes steel belt layer (7) and can be that steel band is closed in the vertical cladding of embossing and steel band is closed in the vertical cladding of flat rubber belting.