CN216014839U - Explosion-proof and waterproof cable - Google Patents

Abstract

The utility model discloses an explosion-proof and waterproof cable which comprises 3 wire cores and an outer sheath, wherein each wire core consists of a conductor, an insulating layer and a metal shielding layer, the conductor is a stranded and compressed copper conductor consisting of a central round single wire, an inner-layer trapezoidal single wire and an outer-layer Z-shaped single wire, the stranded and compressed copper conductor is filled with conductive factice, and the ratio of the stranding pitch diameter of the outer layer is 10-30; the insulating layer is formed by co-extruding a conductor shield, an insulator and an insulating shield; the metal shielding layer is a combined structure of an inner layer semiconductive water-blocking tape, a rectangular copper wire, a seamless copper strip and an outer layer semiconductive water-blocking tape; saddle type elastic semi-conductive water-blocking filler strips are adopted in the centers of the 3 wire cores. The composite metal shielding layer is designed, so that the cable has excellent electromagnetic compatibility, and the excellent longitudinal water-blocking performance of the cable is realized through the structures of conductor filled factice, the metal shielding layer, the wrapping tape water-blocking tape, saddle-type filling cores arranged on the wire cores, the extrusion type sheath and the like.

Description

Explosion-proof and waterproof cable

Technical Field

The utility model belongs to the technical field of cables, and particularly relates to an explosion-proof and waterproof cable.

Background

In some use occasions, the cable is required to have excellent characteristics of explosion resistance (electromagnetic compatibility), water resistance (longitudinal water resistance), impact resistance (external damage resistance) and the like; however, sometimes the customer design side requires the cable product to be of medium voltage class (high electric field strength) and the overall material to be plastic class (poor flexibility and loose overall structure), so that it is difficult to achieve the above service characteristics. The existing products used in the market and users are mostly round twisted copper, single-layer copper strip shielding, molding strip filling and extruded tube type outer sheath common cables, and the cables have poor water resistance due to low conductor compression coefficient and filling of channels; the shielding structure is single, the electrical leakage is large, and the electromagnetic compatibility is poor; the wire core structure is not compact, and center and oversheath are inelastic, and whole shock resistance is not ideal. It is necessary to develop and upgrade a substitute product, and design and innovation are performed from many aspects such as conductor process, shielding form, core structure, etc., so as to create higher technical economy on the basis of realizing the above performances.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is to provide an explosion-proof and waterproof cable, which solves the above technical problems.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

an explosion-proof and waterproof cable comprises 3 wire cores and an outer sheath, wherein each wire core consists of a conductor, an insulating layer and a metal shielding layer, the conductor is a stranded and compressed copper conductor consisting of a central round single wire, an inner-layer trapezoidal single wire and an outer-layer Z-shaped single wire, the conductor is filled with conductive factice, and the ratio of the outer-layer stranded pitch diameter to the outer-layer stranded pitch diameter is 10-30; the insulating layer is formed by co-extruding a conductor shield, an insulator and an insulating shield; the metal shielding layer is of a combined structure of an inner layer semiconductive water-blocking tape, a rectangular copper wire, a seamless copper strip and an outer layer semiconductive water-blocking tape; and saddle-type elastic semi-conductive water-blocking filler strips are adopted at the centers of the 3 wire cores.

Preferably, the cable stranding angle of the wire core is not more than 10 degrees.

Preferably, the cable is wrapped by adopting a rigid wrapping tape with a gap, and the wrapping gap rate is 200-300%.

Preferably, the outer sheath is a rubber-plastic blended elastomer.

Preferably, the outer layer twist pitch ratio is 18.

Preferably, the conductive ointment is water-blocking ointment of communication cables for railway systems, and a high number of carbon powder is added into the water-blocking ointment.

The utility model has the following beneficial effects:

1) the conductor is a stranded compacted copper conductor consisting of a central round single line, an inner-layer trapezoidal single line and an outer-layer Z-shaped single line, the inner-layer single line is designed to ensure that the conductor has a smaller water seepage channel, the outer-layer single line is designed to ensure that a stranded layer is self-locked, and the designed outer-layer stranded pitch ratio ensures that the conductor has a higher compacted coefficient and the surface electric field distribution is more uniform; the conductive factice is adopted for filling, so that the roundness and the smoothness of the conductor are ensured, and the longitudinal water resistance and the low discharge characteristic of the cable are fully realized;

2) the metal shielding layer is of a combined structure of the inner semi-conductive water-blocking tape, the rectangular copper wire, the seamless copper strip and the outer semi-conductive water-blocking tape, the rectangular copper wire and the seamless copper strip enable the cable to have excellent electromagnetic compatibility characteristics, the inner semi-conductive water-blocking tape and the outer semi-conductive water-blocking tape are used as barriers for the inner layer and the outer layer, the shielding layer is guaranteed to have longitudinal water-blocking and low-discharge characteristics, and buffer electric contact can be achieved during stranding;

3) the centers of 3 wire cores are saddle-type elastic semi-conductive water-blocking filler strips, and are wound with rigid wrapping tape gaps after cabling, so that water blocking at the centers of the wire cores and external impact resistance of the shielded wire cores are ensured, and the wire cores are easy to embed when an outer sheath is extruded; the cable forming and stranding angle of the wire cores is not more than 10 degrees, so that the friction degree between each wire core and the die is effectively relieved;

4) according to the utility model, the excellent longitudinal water-blocking performance of the cable is realized through the structural forms of filling factice in the conductor, a metal shielding layer, blocking a water-blocking tape, arranging saddle-type filling cores and extrusion type sheaths on the wire core and the like.

Drawings

Fig. 1 is a schematic structural diagram of an explosion-proof and waterproof cable according to an embodiment of the present invention;

wherein: 1 is a round single wire, 2 is a trapezoidal single wire, 3 is conductive ointment, 4 is a Z-shaped single wire, 5 is a conductor shield, 6 is an insulator, 7 is an insulating shield, 8 is an inner-layer semiconductive water-blocking tape, 9 is a rectangular copper wire, 10 is a seamless copper strip, 11 is an outer-layer semiconductive water-blocking tape, 12 is a saddle-type elastic semiconductive water-blocking filler strip, and 13 is an outer sheath.

Detailed Description

So that the manner in which the features and aspects of the present invention can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.

As shown in fig. 1, the explosion-proof and waterproof cable comprises 3 wire cores and an outer sheath 13, wherein each wire core consists of a conductor, an insulating layer and a metal shielding layer, the conductor is a stranded and compressed copper conductor consisting of a central round single wire 1, an inner-layer trapezoidal single wire 2 and an outer-layer Z-shaped single wire 4, the conductor is filled with conductive factice 3, and the ratio of the outer-layer stranded pitch diameter is 10-30; the insulating layer is formed by co-extruding a conductor shield 5, an insulator 6 and an insulating shield 7; the metal shielding layer is a combined structure of an inner layer semiconductive water-blocking tape 8, a rectangular copper wire 9, a seamless copper strip 10 and an outer layer semiconductive water-blocking tape 11; and saddle-type elastic semi-conductive water-blocking filler strips 12 are adopted at the centers of the 3 wire cores.

The conductor is a stranded and compressed copper conductor consisting of a central round single line 1, an inner-layer trapezoidal single line 2 and an outer-layer Z-shaped single line 4, the conductor can be guaranteed to have a smaller water seepage channel due to the design of the inner-layer single line, and the stranded layer can be guaranteed to form self-locking due to the design of the outer-layer single line.

The conductor and the cable have various characteristics, such as over-small cost, over-high cost, poor electrical characteristics, loose strand and not compact structure of over-large conductor, and the conductor needs to be controlled in a larger and not-too-large interval.

The conductive paste 3 is adopted for filling, so that the roundness and the smoothness of a conductor are guaranteed, the longitudinal water resistance and the low discharge characteristic of a cable are fully realized, particularly, the conductive paste is preferably the water resistance paste of a communication cable for a railway system, and a high number of carbon powder is added, so that the paste has good conductivity on the basis of guaranteeing the water resistance, and the contact resistance among units cannot be improved due to filling.

The metal shielding layer is of a combined structure of an inner semi-conductive water-blocking tape 8, a rectangular copper wire 9, a seamless copper strip 10 and an outer semi-conductive water-blocking tape 11, the rectangular copper wire and the seamless copper strip enable the cable to have excellent electromagnetic compatibility characteristics, the inner layer and the outer layer adopt the semi-conductive water-blocking tapes as barriers, the shielding layer is guaranteed to have longitudinal water-blocking and low-discharge characteristics, and buffer electric contact can be achieved during stranding.

The saddle-type elastic semi-conductive water-blocking filler strip can be made of a PU (polyurethane) blended rubber-plastic semi-conductive elastomer or a PV blended rubber-plastic semi-conductive elastomer or a CPE (chlorinated polyethylene) blended rubber-plastic semi-conductive elastomer; the centers of the 3 wire cores adopt saddle-type elastic semi-conductive water-blocking filler strips, the 3 wire cores are in buffer contact, and the wire cores are stable and compact in structure; the central moisture passage is blocked and the area of the cable most difficult to block water is "closed".

Preferably, the cable stranding angle of the wire core is not more than 10 degrees.

Here, the size of the stranding angle directly affects the production efficiency of the stranding process and the stranding quality of the wire core, for example, if the angle is too small, the friction between the wire cores is small but the wire is liable to jump into a creek, and in order to ensure that the production state is normal, the production speed is reduced, for example, if the angle is too large, the stranding is relatively smooth but the outer edge of the wire core is liable to be extruded (seriously affecting the electrical performance of the finished product). The utility model combines the particularity of the cable structure and obtains the most appropriate die opening position (namely the twisting angle is determined) on the basis of repeated verification on the cabling equipment.

Preferably, the cable is wrapped by adopting a rigid wrapping tape with a gap, and the wrapping gap rate is 200-300%.

The wrapping clearance rate of the binding belt for cabling is very important, the structural integrity of the wire core is influenced by overlarge clearance rate (the wire core expands to a large extent after being discharged from a die if the wire core is not compact), the extrusion efficiency of the outer sheath is influenced by undersize clearance rate (the production speed is too low because the outer sheath is difficult to strip), and the value (200-300%) of the wrapping clearance rate is determined on the basis of repeated verification by combining the expansion rate of the wire core and the stripping operation speed of the belt, so that the structural stability of the wire core after cabling and passing the die can be ensured, and the production efficiency can be ensured to be easily stripped when the outer sheath is extruded subsequently.

Preferably, the outer sheath 13 is a rubber-plastic blended elastomer, and the specific material may be a PU blended rubber-plastic elastomer, a PV blended rubber-plastic elastomer, or a CPE blended rubber-plastic elastomer.

The rubber-plastic blended elastomer selected for the outer sheath can realize the extrusion of the material by a processing technology of common plastics, but can achieve the use characteristics of high-quality rubber cables, and the comprehensive economy of the product is higher.

Preferably, the outer layer twist pitch ratio is 18.

The specific type of the above-mentioned devices is not limited and detailed, and the deep connection mode of the above-mentioned devices is not detailed, and can be understood by those skilled in the art as the common general knowledge.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims (5)

1. An explosion-proof and waterproof cable comprises 3 wire cores and an outer sheath, wherein each wire core consists of a conductor, an insulating layer and a metal shielding layer, and is characterized in that the conductor is a stranded and compressed copper conductor consisting of a central round single wire, an inner-layer trapezoidal single wire and an outer-layer Z-shaped single wire, the conductor is filled with conductive factice, and the ratio of the stranding pitch diameter of the outer layer is 10-30; the insulating layer is formed by co-extruding a conductor shield, an insulator and an insulating shield; the metal shielding layer is of a combined structure of an inner layer semiconductive water-blocking tape, a rectangular copper wire, a seamless copper strip and an outer layer semiconductive water-blocking tape; and saddle-type elastic semi-conductive water-blocking filler strips are adopted at the centers of the 3 wire cores.

2. An explosion-proof and waterproof cable according to claim 1, wherein the stranding angle of the wire cores is not more than 10 degrees.

3. The explosion-proof and waterproof cable according to claim 1, wherein the cable is wrapped with a rigid wrapping tape with a gap of 200-300%.

4. The explosion-proof and waterproof cable according to claim 1, wherein the outer sheath is a rubber-plastic blended elastomer.

5. An explosion-proof and waterproof cable according to claim 1, wherein the outer layer twist pitch ratio is 18.

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