CN112837856A

CN112837856A - Fire-resistant flame-retardant composite flexible cable

Info

Publication number: CN112837856A
Application number: CN202011614640.3A
Authority: CN
Inventors: 王义林; 林爱华; 陆亚军; 张高洋; 盛柯斌
Original assignee: Jiangsu Changfeng Cable Co ltd
Current assignee: Jiangsu Changfeng Cable Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-05-25
Anticipated expiration: 2040-12-30
Also published as: CN112837856B

Abstract

The invention belongs to the technical field of cables, and discloses a fire-resistant and flame-retardant composite flexible cable which comprises a PVC (polyvinyl chloride) protective inner shell, wherein three groups of cable conducting cores are arranged in the PVC protective inner shell in a circumferential manner, each cable conducting core comprises a cable core protective inner sleeve, and a plurality of cable guide cores are uniformly arranged in the cable core protective inner sleeve. The PVC protective inner shell and the PVC protective outer shell have the characteristic of keeping high flame retardance during combustion.

Description

Fire-resistant flame-retardant composite flexible cable

Technical Field

The invention relates to the technical field of cables, in particular to a fire-resistant and flame-retardant composite flexible cable.

Background

The flame-retardant cable requires that a test sample is burnt, after a test fire source is removed, the flame spread is only in a limited range, and residual flame or residual ignition can be self-extinguished in a limited time. The essential feature is that it may burn out and fail to operate in the event of a fire, but may prevent the spread of the fire. However, in the flame retardant cable, a thicker fire-proof smoke-suppressing layer or a plurality of layers of flame-retardant smoke-suppressing knot coatings are usually designed, so that the cable is very heavy and has reduced flexibility.

Disclosure of Invention

The invention aims to provide a fire-resistant and flame-retardant composite flexible cable, which keeps the flexibility and light weight of the cable while ensuring the fire-resistant and flame-retardant characteristics of the cable.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a fire-resistant fire-retardant type compound flexible cable, includes PVC protection inner shell, the inside of PVC protection inner shell is that the circumference is arranged and sets up three cable conduction cores of group, the outer wall parcel PVC protecting sheathing of PVC protection inner shell, the inner chamber lateral wall of PVC protecting sheathing is that the circumference is provided with three spacing card strips of group, and the top at PVC protection inner shell is fixed to the inner joint of spacing card strip, the outer wall of PVC protection inner shell evenly is provided with the tensile arch that the multiunit is spiral setting, the bellied inner chamber of tensile sets up the tensile core, space packing between the inner chamber of PVC protection outer shell and the PVC protection inner shell has the fire-retardant filler of glass fiber.

Preferably, the cable conduction core includes cable core body protection endotheca, the core is led to the inside even stranded cable that sets up of cable core body protection endotheca, the outer wall parcel of cable core body protection endotheca has cable core body overcoat, evenly set up multiunit fire-retardant mica tape between cable core body overcoat and the cable core body protection endotheca, the outer wall parcel of cable core body overcoat has fire-retardant shielding metal net cover, the outer wall parcel of fire-retardant shielding metal net cover has the isolation protective sheath, and the isolation protective sheath inlays in the inside of PVC protection inner shell.

Preferably, the inside of PVC protection inner shell is provided with the locator card hole with cable conduction core matched with, the top of PVC protection inner shell is seted up with spacing draw-in groove of spacing calorie of strip matched with, and is interference fit between locator card hole and the cable conduction core and between spacing draw-in groove and the spacing calorie of strip.

Preferably, the outer wall of the cable core body inner protective sleeve and the side wall of the cable core body outer protective sleeve are both provided with a plurality of groups of clamping grooves corresponding to the flame-retardant mica tapes. Optionally, the clamping groove and the flame-retardant mica tape are in interference fit.

Preferably, the PVC protective casing, the limiting clamping strip and the tensile protrusion are integrally formed by injection molding, and the outer diameter of the PVC protective casing is 10 mm.

Preferably, the tensile core is a 0.1mm tensile steel wire, and the tensile core and the tensile protrusion are integrally and compositely molded.

Preferably, the PVC outer protective shell and the PVC inner protective shell are both made of halogen-free cross-linked polyethylene XLPE flame-retardant plastic, and the inner side wall of the PVC outer protective shell and the outer side wall of the PVC inner protective shell are coated with zinc oxide coatings.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, the glass fiber flame-retardant filler is filled between the PVC protective inner shell and the PVC protective outer shell, the flame-retardant mica tape is arranged between the cable core protective inner sleeve and the cable core protective outer sleeve, and the flame-retardant mica tape is wrapped on the outer wall of the flame-retardant mica tape, so that the whole cable has three layers of flame-retardant protection from outside to inside, the influence of the cable on the conduction characteristic of the cable core protective inner sleeve due to self ignition or fire is avoided, the zinc oxide coatings are coated on the outer wall of the PVC protective inner shell and the inner side wall of the PVC protective outer shell, so that the PVC protective inner shell and the PVC protective outer shell have certain flame-retardant characteristic during combustion, the diffusion phenomenon of a fire source is reduced, the tensile core is uniformly arranged on the outer wall of the PVC protective outer shell, the tensile property of the whole cable can be increased.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of portion A of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention.

In the drawings, the components represented by the respective reference numerals are listed below:

the cable comprises, by weight, 1-a PVC protective inner shell, 2-a cable conductive core, 21-a cable core protective inner shell, 22-a cable guide core, 23-a cable core protective outer shell, 24-a flame-retardant mica tape, 25-a flame-retardant shielding metal mesh sleeve, 26-an isolation protective sleeve, 3-a PVC protective outer shell, 4-a limiting clamping strip, 5-a tensile bulge, 6-a tensile core and 7-a glass fiber flame-retardant filler.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The fire-resistant and flame-retardant composite flexible cable according to the exemplary embodiment shown in fig. 1 to fig. 3 includes a PVC inner protective shell 1, three sets of cable conductive cores 2 are circumferentially arranged inside the PVC inner protective shell 1, an outer wall of the PVC inner protective shell 1 is wrapped by a PVC outer protective shell 3, and the PVC outer protective shell 3 and the PVC inner protective shell 1 are both made of halogen-free cross-linked polyethylene XLPE flame-retardant plastic. Preferably, the inner side wall of the PVC outer protective shell 3 and the outer side wall of the PVC inner protective shell 1 are coated with zinc oxide coatings. Therefore, the zinc oxide coating can improve the stability of carbon during combustion, prevent smoke from being generated, and form a compact coke shell to prevent open fire from continuing to extend outwards, so that the PVC protective inner shell 1 and the PVC protective outer shell 3 have certain flame retardant property during combustion, and the diffusion phenomenon of a fire source is reduced.

The inner cavity side wall of the PVC protective outer shell 3 is circumferentially provided with three groups of limiting clamping strips 4, and the inner ends of the limiting clamping strips 4 are clamped and fixed at the top end of the PVC protective inner shell 1.

The inside of PVC protection inner shell 1 is provided with the locator card hole with cable conduction core 2 matched with, and the top of PVC protection inner shell 1 is seted up with spacing draw-in groove of spacing card strip 4 matched with. Preferably, be interference fit between location card hole and the cable conduction core 2 and between spacing draw-in groove and the spacing gib 4, make cable conduction core 2 in PVC protection inner shell 1 and PVC protection inner shell 1 can the stability of holding position in PVC protection shell 3.

The cable conduction core 2 comprises a cable core protection inner sleeve 21, a plurality of cable guide cores 22 are uniformly arranged inside the cable core protection inner sleeve 21, a cable core protection outer sleeve 23 wraps the outer wall of the cable core protection inner sleeve 21, a plurality of groups of flame-retardant mica tapes 24 are uniformly arranged between the cable core protection outer sleeve 23 and the cable core protection inner sleeve 21, a plurality of groups of clamping grooves corresponding to the flame-retardant mica tapes 24 are formed in the outer wall of the cable core protection inner sleeve 21 and the side wall of the cable core protection outer sleeve 23, the clamping grooves and the flame-retardant mica tapes 24 are in interference fit, and the stability of the flame-retardant mica tapes 24 between the cable core protection outer sleeve 23 and the cable core protection inner sleeve 21 is guaranteed.

The outer wall parcel of cable core body overcoat 23 has fire-retardant shielding metal mesh cover 25, and the outer wall parcel of fire-retardant shielding metal mesh cover 25 has isolation protective sheath 26, and isolation protective sheath 26 inlays in the inside of PVC protection inner shell 1.

The outer wall of PVC protection inner shell 1 evenly is provided with the tensile arch 5 that the multiunit is the spiral setting. Particularly preferably, the PVC protective shell 3, the limiting clamping strip 4 and the tensile bulge 5 are integrally formed by injection molding.

In the example of the invention, the outer diameter of the PVC casing 3 is 10 mm.

The inner cavity of the tensile bulge 5 is provided with a tensile core body 6, the tensile core body 6 preferably adopts a tensile thin steel wire with the diameter range of 0.05-0.1mm, and the tensile core body 6 and the tensile bulge 5 are integrally and compositely molded. In a preferred embodiment, the tensile core body is formed by stranding and co-weaving thin steel wires and Kevlar fibers, and small-pitch stranding is adopted, so that the flexibility and the tensile property of the tensile core body are improved, and the weight of the steel wires which are used only is reduced.

Through evenly setting up tensile core 6 at PVC protecting sheathing 3's outer wall, can increase the holistic tensile property of cable, avoid causing the phenomenon of rupture of cable because of the burning.

The space between the inner cavity of the PVC protective outer shell 3 and the PVC protective inner shell 1 is filled with the glass fiber flame-retardant filler 7, the glass fiber flame-retardant filler 7 is filled between the PVC protective inner shell 1 and the PVC protective outer shell 3, the flame-retardant mica tape 24 is arranged between the cable core protective inner sleeve 21 and the cable core protective outer sleeve 23, and the flame-retardant mica tape 25 is wrapped on the outer wall of the flame-retardant mica tape 24, so that the fireproof and flame-retardant design is optimized, the whole cable has multi-layer three-dimensional fire-resistant protection from outside to inside, and the influence of the ignition or fire of the cable on the conduction characteristic of the cable core protective inner sleeve 21 is avoided.

Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. The fire-resistant and flame-retardant composite flexible cable is characterized in that: the cable comprises a PVC (polyvinyl chloride) protective inner shell (1), wherein three groups of cable conductive cores (2) are arranged in the PVC protective inner shell (1) in a circumferential arrangement manner; the PVC protective shell (3) is wrapped on the outer wall of the PVC protective inner shell (1), three groups of limiting clamping strips (4) are arranged on the side wall of an inner cavity of the PVC protective outer shell (3) in a circumferential manner, the inner ends of the limiting clamping strips (4) are clamped and fixed to the top end of the PVC protective inner shell (1), a plurality of groups of tensile protrusions (5) which are spirally arranged are uniformly arranged on the outer wall of the PVC protective inner shell (1), a tensile core body (6) is arranged in an inner cavity of each tensile protrusion (5), and glass fiber flame-retardant filler (7) is filled in a space between the inner cavity of the PVC protective outer shell (3) and the PVC protective inner shell (1;

the cable conductive core (2) comprises:

a cable core protective inner sleeve (21);

a multi-strand cable guide core (22) uniformly arranged inside the cable core body protective inner sleeve (21);

the cable core body protective outer sleeve (23) is wrapped on the outer wall of the cable core body protective inner sleeve (21);

a plurality of groups of flame-retardant mica tapes (24) are uniformly arranged between the cable core body outer protective sleeve (23) and the cable core body inner protective sleeve (21);

the flame-retardant shielding metal mesh sleeve (25) is arranged on the outer wall of the cable core protective outer sleeve (23);

and the isolation protective sleeve (26) is arranged on the outer wall of the flame-retardant shielding metal net sleeve (25) and the isolation protective sleeve (26) is embedded in the PVC protection inner shell (1).

2. The fire-resistant and flame-retardant composite flexible cable according to claim 1, characterized in that: the inside of PVC protection inner shell (1) is provided with the locator card hole with cable conduction core (2) matched with, the top of PVC protection inner shell (1) is seted up with spacing card strip (4) matched with spacing draw-in groove.

3. The fire-resistant and flame-retardant composite flexible cable according to claim 2, characterized in that: and the positioning clamp holes and the cable conducting core body (2) and the limiting clamp grooves and the limiting clamp strips (4) are in interference fit.

4. The fire-resistant and flame-retardant composite flexible cable according to claim 1, characterized in that: the outer wall of the cable core body inner protecting sleeve (21) and the side wall of the cable core body outer protecting sleeve (23) are provided with a plurality of groups of clamping grooves corresponding to the flame-retardant mica tapes (24).

5. The fire-resistant and flame-retardant composite flexible cable according to claim 1, characterized in that: PVC protecting sheathing (3), spacing card strip (4) and tensile arch (5) between be integrated injection moulding.

6. The fire-resistant and flame-retardant composite flexible cable according to claim 1, characterized in that: the tensile core body (6) is a tensile steel wire with the diameter of 0.05-0.1mm, and the tensile core body (6) and the tensile bulge (5) are integrally and compositely molded.

7. The fire-resistant and flame-retardant composite flexible cable according to claim 1, characterized in that: the PVC protective outer shell (3) and the PVC protective inner shell (1) are both made of halogen-free cross-linked polyethylene XLPE flame-retardant plastic.

8. The fire-resistant and flame-retardant composite flexible cable according to claim 1, characterized in that: the inner side wall of the PVC protective outer shell (3) and the outer side wall of the PVC protective inner shell (1) are coated with zinc oxide coatings.