CN211062503U

CN211062503U - Flame-retardant PVC insulating sheath

Info

Publication number: CN211062503U
Application number: CN201922413349.9U
Authority: CN
Inventors: 李荣伟; 刘勇; 张辉
Original assignee: YIXING HUAYUAN ELECTRICIAN EQUIPMENTS Ltd
Current assignee: YIXING HUAYUAN ELECTRICIAN EQUIPMENTS Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-07-21
Anticipated expiration: 2029-12-27

Abstract

The utility model belongs to the technical field of the cable sheathing, especially, be a fire-retardant PVC insulating sheath, including PVC inner sheath layer, the outside cladding on PVC inner sheath layer has the fire-retardant layer of glass fiber, it has fire-retardant filler to fill between fire-retardant layer of glass fiber and the PVC inner sheath layer, the outside cladding on the fire-retardant layer of glass fiber has elastic buffer layer, elastic buffer layer's outside cladding has the steel band armor, elastic buffer layer's surface is provided with arc elasticity sand grip, it has thermal-insulated elastic filler to fill before steel band armor and the elastic buffer layer. The utility model discloses an increase fire-retardant filler between glass fiber flame retardant layer and PVC inner sheath layer, at first utilize fire-retardant filler can directly play flame retardant efficiency to can play the guard action to glass fiber flame retardant layer, dual fire-retardant protection can improve fire-retardant PVC insulating sheath's flame retardant efficiency, consequently can satisfy the fire-retardant demand of cable to fire-retardant PVC insulating sheath.

Description

Flame-retardant PVC insulating sheath

Technical Field

The utility model relates to a cable sheathing technical field specifically is a fire-retardant PVC insulating sheath.

Background

At present, with the development of science and technology, the fields of industry and the like are also rapidly improved, the increase of the using amount of the cable is brought along, the existing cable structure generally comprises a plurality of conductors, an insulating layer, a braided layer, an integral sheath and the like which are coated outside each conductor, the types of the cable are various, the cable can be applied to different fields, the service environments of the different fields are different, and therefore, different requirements on the cable are also met, but the cable often selects a PVC insulating sheath as the cable insulating protection.

However, the current PVC insulating sheath has the following disadvantages in use:

1. because the cable can generate heat when working, in order to ensure the normal use of the cable, a single flame-retardant layer is usually added on the PVC insulating sheath to improve the flame retardance of the PVC insulating sheath, but the flame retardance is general, and after the flame-retardant layer is damaged, the flame retardance of the whole cable is greatly reduced, so that the single flame-retardant layer cannot meet the requirement of the cable on the flame retardance;

2. the buffering performance and the protection performance of the PVC insulating sheath are improved, and therefore the phenomenon that a cable core installed inside the PVC insulating sheath is cracked due to compression can occur.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Not enough to prior art, the utility model provides a fire-retardant PVC insulating sheath has solved the problem of proposing in the above-mentioned background art.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a fire-retardant PVC insulating sheath, includes PVC inner sheath layer, the outside cladding on PVC inner sheath layer has glass fiber flame retardant coating, it has fire-retardant filler to fill between glass fiber flame retardant coating and the PVC inner sheath layer, the outside cladding on glass fiber flame retardant coating has the elastic buffer layer, the outside cladding of elastic buffer layer has the steel band armor, the surface of elastic buffer layer is provided with arc elasticity sand grip, it has thermal-insulated elastic filler to fill before steel band armor and the elastic buffer layer, the outside cladding on steel band armor has PVC outer sheath layer.

As a preferred technical scheme of the utility model, the fire-retardant filler is modified expanded vermiculite.

As a preferred technical scheme of the utility model, the fire-retardant layer of glass fiber comprises glass fiber felt layer, polyester belt layer and the solidification phenolic resin layer between the two, the cladding of glass fiber felt layer is in the outside of PVC inner sheath layer, the polyester belt layer is located elastic buffer layer's inboard.

As an optimized technical scheme of the utility model, the elastic buffer layer is made by silica gel material, thermal-insulated elastic filler is polyamide filler.

As an optimal technical scheme of the utility model, the PVC oversheath layer includes polyvinyl chloride basic unit, polyvinyl chloride basic unit cladding is in the outside of steel band armor, polyvinyl chloride basic unit's outside complex has waterproof thin layer.

As an optimized technical proposal of the utility model, the waterproof film layer is an oxidized polyvinyl alcohol film.

(III) advantageous effects

Compared with the prior art, the utility model provides a fire-retardant PVC insulating sheath possesses following beneficial effect:

1. this fire-retardant PVC insulating sheath through increase fire-retardant filler between glass fiber flame retardant coating and PVC inner sheath layer, at first utilizes fire-retardant filler can directly play flame retardant efficiency to can play the guard action to glass fiber flame retardant coating, dual fire-retardant protection can improve fire-retardant PVC insulating sheath's fire behaviour, consequently can satisfy the fire-retardant demand of cable to fire-retardant PVC insulating sheath.

2. This fire-retardant PVC insulating sheath through the cooperation that sets up elastic buffer layer and steel band armor, can improve fire-retardant PVC insulating sheath's buffer nature and protectiveness, at first rely on the steel band armor can disperse the pressure that fire-retardant PVC insulating sheath bore to again play the cushioning effect through elastic buffer layer, consequently can play effectual guard action to the cable core that sets up in PVC inner sheath in situ portion, improved fire-retardant PVC insulating sheath's bearing capacity.

3. This fire-retardant PVC insulating sheath because the last arc elasticity sand grip that is provided with of elastic buffer layer, consequently can form a buffering cavity between elastic buffer layer and the steel band armor, and the inside of buffering cavity still is filled simultaneously has thermal-insulated elastic filler, has consequently further improved fire-retardant PVC insulating sheath's protectiveness.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a side view of the structure of the present invention;

FIG. 3 is a schematic structural view of a glass fiber flame retardant layer of the present invention;

fig. 4 is a schematic view of the PVC outer sheath layer of the present invention.

In the figure: 1. a PVC inner jacket layer; 2. a fiberglass flame retardant layer; 201. a glass fiber felt layer; 202. a polyester tape layer; 203. a phenolic resin layer; 3. an elastic buffer layer; 4. a steel tape armor layer; 5. heat-insulating elastic filler; 6. a PVC outer jacket layer; 601. a polyvinyl chloride-based layer; 602. a waterproof film layer; 7. a flame retardant filler.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

Referring to fig. 1-4, the present invention provides the following technical solutions: the utility model provides a fire-retardant PVC insulating sheath, including PVC inner sheath layer 1, the outside cladding of PVC inner sheath layer 1 has glass fiber flame retardant coating 2, it has fire-retardant filler 7 to fill between glass fiber flame retardant coating 2 and the PVC inner sheath layer 1, the outside cladding of glass fiber flame retardant coating 2 has elastic buffer layer 3, elastic buffer layer 3's outside cladding has steel band armor 4, elastic buffer layer 3's surface is provided with arc elasticity sand grip, it has thermal-insulated elastic filler 5 to fill before steel band armor 4 and elastic buffer layer 3, steel band armor 4's outside cladding has PVC outer sheath layer 6.

In the embodiment, a cable core consisting of conductors is arranged inside the PVC inner sheath layer 1; the utility model adds the flame-retardant filler 7 between the glass fiber flame-retardant layer 2 and the PVC inner sheath layer 1, firstly, the flame-retardant filler 7 can be directly used for flame-retardant effect, and can play a role in protecting the glass fiber flame-retardant layer 2, the flame-retardant performance of the flame-retardant PVC insulating sheath can be improved by double flame-retardant protection, so that the flame-retardant requirement of the cable on the flame-retardant PVC insulating sheath can be met; the buffer property and the protection property of the flame-retardant PVC insulating sheath can be improved by arranging the elastic buffer layer 3 and the steel strip armor layer 4, the pressure borne by the flame-retardant PVC insulating sheath can be dispersed by the steel strip armor layer 4, and the buffer effect is realized by the elastic buffer layer 3, so that the cable core arranged in the PVC inner sheath layer can be effectively protected, and the bearing property of the flame-retardant PVC insulating sheath is improved; because the last arc elasticity sand grip that is provided with of elastic buffer layer 3, consequently can form a buffering cavity between elastic buffer layer 3 and the steel band armor 4, the inside of buffering cavity still is filled simultaneously has thermal-insulated elastic filler 5, has consequently further improved fire-retardant PVC insulating sheath's protectiveness.

Specifically, the flame-retardant filler 7 is modified expanded vermiculite.

In the embodiment, the modified expanded vermiculite is prepared by adding the expanded vermiculite into a saturated ammonium carbonate solution, dispersing and drying the expanded vermiculite by using ultrasonic waves, then adding a polysiloxane flame retardant and a silane coupling agent, uniformly mixing the ammonium carbonate and the polysiloxane flame retardant with the solution, and drying the mixture to obtain the modified expanded vermiculite, wherein the ammonium carbonate and the polysiloxane have flame retardancy, the ammonium carbonate can absorb heat to decompose and generate gas under high temperature, the gas can contact with the polysiloxane flame retardant, and the polysiloxane flame retardant can generate a foaming process similar to that of the polysiloxane flame retardant and adhere to the outer surface of the PVC inner sheath layer 1, so that the modified expanded vermiculite plays a role in isolating air for a cable core inside the VC inner sheath layer 1, and.

Specifically, the glass fiber flame retardant layer 2 is composed of a glass fiber felt layer 201, a polyester tape layer 202 and a phenolic resin layer 203 solidified between the two, the glass fiber felt layer 201 is coated on the outer side of the PVC inner sheath layer 1, and the polyester tape layer 202 is positioned on the inner side of the elastic buffer layer 3.

In this embodiment, both the glass fiber felt layer 201 and the polyester tape layer 202 have high temperature resistance, and thus are suitable for the material of the glass fiber flame retardant layer 2, and the flame retardancy can be further improved due to the design of the double-layer structure.

Specifically, the elastic buffer layer 3 is made of a silica gel material, and the heat-insulating elastic filler 5 is a polyamide filler.

In the embodiment, the polyamide filler has the properties of mechanical strength, heat resistance, low friction coefficient, wear resistance and the like, so that the polyamide filler serving as the heat-insulating elastic filler 5 can improve the protective performance of the flame-retardant PVC insulating sheath.

Specifically, the PVC outer sheath layer 6 includes a PVC base layer 601, the PVC base layer 601 is coated on the outer side of the steel tape armor layer 4, and a waterproof film layer 602 is compounded on the outer side of the PVC base layer 601.

In this embodiment, the waterproof thin film layer 602 is added outside the polyvinyl chloride based layer 601, so that the waterproof and moistureproof performance of the PVC outer sheath layer 6 can be improved, and the performance of the PVC outer sheath layer 6 can be improved.

Specifically, the waterproof film layer 602 is an oxidized polyvinyl alcohol film.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a fire-retardant PVC insulating sheath, includes PVC inner sheath layer (1), its characterized in that: the outside cladding of PVC inner sheath layer (1) has glass fiber flame retardant coating (2), it has fire-retardant filler (7) to fill between glass fiber flame retardant coating (2) and PVC inner sheath layer (1), the outside cladding of glass fiber flame retardant coating (2) has elastic buffer layer (3), the outside cladding of elastic buffer layer (3) has steel band armor (4), the surface of elastic buffer layer (3) is provided with arc elasticity sand grip, it has thermal-insulated elastic filler (5) to fill before steel band armor (4) and elastic buffer layer (3), the outside cladding of steel band armor (4) has PVC outer sheath layer (6).

2. The flame retardant PVC insulation jacket according to claim 1, wherein: the flame-retardant filler (7) is modified expanded vermiculite.

3. The flame retardant PVC insulation jacket according to claim 1, wherein: the glass fiber flame-retardant layer (2) is composed of a glass fiber felt layer (201), a polyester tape layer (202) and a phenolic resin layer (203) solidified between the glass fiber felt layer and the polyester tape layer, the glass fiber felt layer (201) is coated on the outer side of the PVC inner sheath layer (1), and the polyester tape layer (202) is located on the inner side of the elastic buffer layer (3).

4. The flame retardant PVC insulation jacket according to claim 1, wherein: the elastic buffer layer (3) is made of a silica gel material, and the heat-insulating elastic filler (5) is a polyamide filler.

5. The flame retardant PVC insulation jacket according to claim 1, wherein: the PVC outer sheath layer (6) comprises a polyvinyl chloride base layer (601), the polyvinyl chloride base layer (601) is coated on the outer side of the steel tape armor layer (4), and a waterproof thin film layer (602) is compounded on the outer side of the polyvinyl chloride base layer (601).

6. A flame retardant PVC insulation sheath according to claim 5, characterized in that: the waterproof film layer (602) is an oxidized polyvinyl alcohol film.