RU213926U1 - ALARM AND INTERLOCK CABLE, ARMORED, WATERPROOF, HALOGEN-FREE - Google Patents

Abstract

The utility model relates to cables for fire alarm and automation systems. The technical task is to increase the rigidity of the armor while maintaining the flexibility of the cable.

The cable contains conductive cores 1 with insulation 2 made of a halogen-free polymer composition (PBgC). The cores, twisted in pairs together with water-blocking threads 3, are twisted into a core 4. A winding is applied to the core, including a tape 5 of a water-blocking material and a tape 6 of polyethylene terephthalate. A screen 7 made of aluminum flex, equipped with a contact core 8, is superimposed on the winding. An inner shell 9 of PBgK is superimposed on the screen. Shell 9 is overlaid with armor 10, made in the form of a steel welded corrugated tube, in which the corrugation ribs are located across the axis of the tube. A protective sheath 13 in the form of a PBgK hose is applied to the armor 10. 4 w.p. f-ly, 2 ill.

Description

The utility model (hereinafter - PM) refers to cable products, specifically, to cables intended for use in fire alarm and automation systems.

A known cable for signaling and blocking according to the patent for PM No. 178398, which contains insulated copper conductors twisted into a pair, water-blocking threads are laid between the conductors. Pairs with threads are twisted into a core, on which a tape of water-blocking material is wound. The cable is armored with two steel tapes or one corrugated tape. Also known is a cable according to the patent for PM No. 197436, including conductive cores with insulation from a polymer compound that does not contain halogens. The cores are twisted into a core; on which a sheath made of a halogen-free composition is applied. The shell is armored with glass rods. A protective hose made of halogen-free thermoplastic compounds is superimposed on the armor.

The closest, in our opinion, to the proposed utility model is the cable according to the patent for PM No. 197480 - prototype. The specified cable contains copper conductors with insulation from a polymer compound that does not contain halogens. The cores are twisted into a core, on which belt insulation from a halogen-free polymer composition is applied. The belt insulation is armored from two galvanized steel tapes wound with overlap. The armor is overlaid with an inner shell of polymer compounds that do not contain halogens. A protective hose 9 made of halogen-free polymer compounds is superimposed on the armor.

The disadvantages of the prototype include the fact that the armor of steel tapes superimposed on the shell of the polymer does not protect the cable from lateral compressive loads. Such protection is necessary when installing the cable underground, where ground movements can occur in directions across the cable route.

The technical task is to increase the strength of the cable by increasing the rigidity of the armor while maintaining the flexibility of the cable.

The technical result is achieved by the fact that the cable for signaling and blocking, armored, waterproof, halogen-free, containing polymer-insulated copper conductors, twisted together with water-blocking threads into pairs, which are twisted into a common core, wrapped with a tape of water-blocking material, on which a tape of polyethylene terephthalate, an inner sheath made of a polymer, an armor made of steel, an outer sheath made of a halogen-free polymer composition, characterized in that said armor is made in the form of a steel welded corrugated tube, in which the corrugation ribs are located across the axis of the tube. In the cable, the current-carrying cores are made of single-wire, with a core diameter of 0.8 mm to 1.0 mm. In the cable, the core insulation can be made of a halogen-free polymer composition or polyethylene. An electrostatic screen made of aluminoflex can be built into the cable, equipped with a contact conductor in the form of a copper core. In the cable, the inner sheath can be made of a halogen-free polymer composition or polyethylene.

The utility model is illustrated by drawings. In FIG. 1 schematically (not to scale) shows a cross-section of the proposed cable. In FIG. 2 shows its general view.

In the example of a specific design, the cable contains current-carrying conductors 1 made of annealed copper wire with a diameter of 0.8 mm to 1.0 mm. The cores are covered with insulation 2 made of polyethylene or halogen-free polymer composition (PBgC). Insulated wires, twisted in pairs together with water-blocking threads 3, are twisted into a core 4. A tape 5 of water-blocking material and a tape 6 of polyethylene terephthalate are wound on the core, forming together the core winding. An electrostatic screen 7 made of aluminoflex is superimposed on the winding, equipped with a contact conductor in the form of a copper core 8. An inner sheath 9 is superimposed on the screen 7. The sheath 9 can be made of PBgC or polyethylene. It is possible to manufacture a cable without a screen. In this case, there is no letter E in the cable marking.

Armor 10 is superimposed on the shell 9. The armor is made in the form of a steel welded corrugated tube 11, in which the ribs 12 of the corrugation are located across the axis of the tube. Due to the bending of the corrugations, the extensibility of the tube 11 in the axial direction is ensured. This property gives the cable the flexibility required for transportation in the form of a coil wound on a drum and / or during installation. The armor 10 is overlaid with a protective sheath 13, made in the form of a PBgK hose.

The cable is produced according to traditional technology on conventional factory equipment. The screen is made of aluminum-polyethylene tape by winding with overlapping. Armor is made from steel tape by bending the tape into a tube, welding the edges along the contact line, and corrugating the welded tube using a special machine. The device of the machine is the subject of know-how. The core insulation and the inner sheath are made of PBGK at the request of the Customer.

The cable is used in accordance with the rules for the installation of electrical installations and project documentation in terms of cable laying during the installation of alarm and blocking systems.

According to the scheme described above, the Applicant's enterprise produced samples of four types of cable marked: SBPVBPBgPng(А)-HF, SBPVBPBgPeng(А)-HF, SBVBPBgPng(А)-HF and SBVBPBgEPng(А)-HF, respectively. Tests have shown that the armor in the form of a steel corrugated tube reliably protects the cable cores from transverse loads. At the same time, the bends of the corrugations provide the armor with extensibility, which gives the cable the flexibility necessary for winding on a drum, as well as when installing alarm systems in areas with turns at an angle of up to 90 °.

The proposed cable has an advantage over analogues. Corrugations of steel armor reliably protect the cable core from transverse compressive loads. At the same time, due to the bends of the corrugations, the flexibility of the cable as a whole is ensured. Water-blocking material in the form of threads and tapes protects the conductive cores from moisture. When the cable is heated excessively, such as in a fire, the halogen-free polymer components of the cable do not emit toxic gases harmful to humans. The absence of harmful gases during smoke facilitates the work of fire extinguishing personnel, therefore, increases the fire safety of cable products. The cable does not use scarce materials, almost all cable elements are produced by the domestic industry.

The Applicant has begun forming a portfolio of orders for the above-described cable products with corrugated tubular steel armor and moisture protection.

The new, industrially applicable cable device for signaling and blocking described above is proposed for legal protection by a utility model patent.

Claims (5)

1. Cable for signaling and blocking, armored, waterproof, halogen-free, containing polymer-insulated copper conductors, twisted together with water-blocking threads into pairs, which are twisted into a common core, wrapped with a tape of water-blocking material and a tape of polyethylene terephthalate, an inner sheath of polymer, armor made of steel, an outer shell made of a halogen-free polymer composition, characterized in that said armor is made in the form of a steel welded corrugated tube, in which the corrugation ribs are located across the axis of the tube. 2. Cable according to claim 1, characterized in that the conductive cores are made of single-wire, with a core diameter of 0.8 mm to 1.0 mm. 3. Cable according to claim 1, characterized in that the core insulation is made of a halogen-free polymer composition or polyethylene. 4. The cable according to claim. 1, characterized in that the cable additionally contains an electrostatic screen made of aluminoflex, equipped with a contact conductor in the form of a copper core. 5. The cable according to claim 1, characterized in that the inner sheath is made of a halogen-free polymer composition or polyethylene.

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