CN210911391U

CN210911391U - MPP cable protection pipe

Info

Publication number: CN210911391U
Application number: CN201921560622.4U
Authority: CN
Inventors: 汪义; 明剑平; 王万轮; 黄胜祥
Original assignee: Zhejiang Rongzheng Tube Co ltd
Current assignee: Zhejiang Rongzheng Tube Co ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-07-03
Anticipated expiration: 2029-09-19

Abstract

The utility model relates to a cable protection tube technical field, concretely relates to MPP cable protection tube. An MPP cable protection pipe comprises a first pipe body layer, a second pipe body layer, a strength layer, a flame retardant layer and a sheath layer; the strength layer is arranged between the first pipe body layer and the second pipe body layer; the flame-retardant layer is wrapped on the second tube body layer, and the sheath layer is extruded on the flame-retardant layer. The utility model discloses an enhancement layer, with first body layer and second body layer through crowded extrusion altogether, the enhancement layer is by the cladding at the internal portion of body layer to form an overall structure. The utility model is additionally provided with a sheath layer outside the flame retardant layer, wherein the sheath layer can be an MPP sheath pipe or a CPVC sheath pipe, thereby wrapping the flame retardant layer and avoiding the sheath layer from being exposed; because the sheath layer is also made of plastic and has a certain thickness, the sheath layer is not afraid of corrosion and abrasion under common working conditions.

Description

MPP cable protection pipe

Technical Field

The utility model relates to a cable protection tube technical field, concretely relates to MPP cable protection tube.

Background

The cable is not erected in the air any more in the city, but is buried in the road, and the burying of the cable needs to be provided with the laying of a cable protection pipeline as a basic project, and at present, the main cable protection pipes comprise a glass steel pipe, a CPVC pipe, a PVC pipe, a PE pipe, an MPP pipe, a plastic coated steel pipe, a cement pipe and the like. Wherein the cement pipe is heavy and troublesome to carry; the corrosion resistance of the steel pipe is poor; the strength of the plastic pipe is not enough, and the potential flammable hazard exists. Therefore, there is a need in the art for a power protection tube that is lightweight, strong, corrosion resistant, and non-combustible.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the above problem to provide a MPP cable protection pipe. The pipe has the advantages of light weight, high strength, corrosion resistance and flame retardance.

The utility model provides a technical scheme as follows of above-mentioned problem:

an MPP cable protection pipe comprises a first pipe body layer, a second pipe body layer, a strength layer, a flame retardant layer and a sheath layer; the strength layer is arranged between the first pipe body layer and the second pipe body layer; the flame-retardant layer is wrapped on the second tube body layer, and the sheath layer is extruded on the flame-retardant layer.

Preferably, in the above technical solution, the strength layer is a skeleton layer formed by using glass fibers as a main reinforcing medium.

In the technical scheme, the glass fiber and other reinforcing media are uniformly mixed in the melt of the MPP in a large adding amount, such as 30-50 wtwt%, and after coextrusion, a strength layer is formed between two pipe body layers. Preferably, the reinforcing medium such as glass fibers is also silane treated to improve its dispersibility in the melt of the MPP.

Preferably, the first tube body layer and the second tube body layer are both made of modified polypropylene; the first pipe body layer and the second pipe body layer are extruded by the same extruder, and the strength layer is extruded by the other extruder; and enabling the melt extruded by the two extruders to enter a three-channel die and then extruding the melt through the same die orifice to obtain a pipe body structure formed by integrating a first pipe body layer, a strength layer and a second pipe body layer.

Preferably, the flame-retardant layer is a low-smoke halogen-free flame-retardant wrapping tape, a mica wrapping tape or a ceramic silicon rubber tape.

Preferably, in the above technical solution, the sheath layer is a modified polypropylene extrusion layer or a CPVC extrusion layer.

Preferably, in the above technical solution, a thermal insulation coating is further disposed on an inner surface of the first pipe body layer.

The utility model discloses following beneficial effect has:

1. the utility model adopts the glass fiber reinforced modified polypropylene to form an enhancement layer (also called strength layer), which is equivalent to form a skeleton structure, so that the integral strength is improved;

2. the enhancement layer of the utility model, together with the first pipe body layer and the second pipe body layer, is extruded by co-extrusion, and the enhancement layer is coated inside the pipe body layer, thereby forming an integral structure; the overall structure not only obviously improves the strength, but also shows the performance of the MPP power protection tube, and is suitable for the application range of the original MPP power protection tube;

3. the utility model has the advantages that the flame retardant layer is wrapped outside the second pipe body layer, so that the utility model has the flame retardant characteristic, and the flammable potential safety hazard of the plastic pipe is solved from the source;

4. the utility model is additionally provided with a sheath layer outside the flame retardant layer, wherein the sheath layer can be an MPP sheath pipe or a CPVC sheath pipe, thereby wrapping the flame retardant layer and avoiding the sheath layer from being exposed; because the sheath layer is also made of plastic and has a certain thickness, the sheath layer is not afraid of corrosion and abrasion under common working conditions.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

in the figure, 1-thermal barrier coating, 2-first tubular body layer, 3-strength layer, 4-second tubular body layer, 5-flame retardant layer, 6-jacket layer.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

This detailed description is merely illustrative of the present invention and is not intended to be limiting. After reading the specification of the present invention, those skilled in the art will be protected by the patent laws without departing from the scope of the appended claims.

Example 1

As shown in fig. 1, an MPP cable protection tube sequentially includes, from inside to outside, a first tube body layer 2, a strength layer 3, a second tube body layer 4, a flame retardant layer 5, and a sheath layer 6. Wherein the first pipe body layer is also internally coated with a thermal barrier coating 1.

The cable protection pipe is manufactured as follows:

1. preparing two extruders, one extruder being used for extruding the melt of the first and second tube layers, the melt of the two tube layers being identical so that the same extruder can be used for extrusion; extruding the molten material of the strength layer by another extruder, wherein the carrier of the molten material of the strength layer is the same as the molten materials of the first tube body layer and the second tube body layer, but is added with a reinforcing material, such as glass fiber, and the adding amount of the glass fiber reaches 40wt% in the embodiment; the melt from the two extruders then enters a die having 3 channels, wherein the melt from the strength layer enters the middle channel;

2. after the melt enters the die, co-extruding and extruding the melt from a die orifice to obtain an integrally formed composite tube body comprising a first tube body layer, a strength layer and a second tube body layer;

3. wrapping a layer of ceramic silicon rubber belt on the composite pipe body by using a wrapping machine to form a flame-retardant layer;

4. extruding a sheath layer outside the flame-retardant layer by using a machine tool, wherein the sheath layer is made of modified polypropylene; the thickness of the sheath layer is controlled to be 0.5 cm;

5. adopting a coating machine, and adding spraying liquid with a heat insulation effect into a material liquid box of the coating machine; the spray head part of the coating machine is drilled into the pipe body, and the rotary spray head is used for spraying a layer of heat-insulating coating on the inner wall of the pipe body; the feeding of the spray head part of the coating machine in the pipe body is controlled by adopting the combination of a servo motor and a screw rod;

6. after the spraying is finished, a centrifugal fan is used for blowing air to one end of the pipe body, and the solidification of the spray liquid with the heat insulation effect is accelerated.

Example 2

The only difference from example 1 is that the first pipe body layer is not internally coated with a thermal barrier coating.

Claims

1. An MPP cable protection pipe which characterized in that: comprises a first pipe body layer (2), a second pipe body layer (4), a strength layer (3), a flame retardant layer (5) and a sheath layer (6); the strength layer (3) is arranged between the first pipe body layer (2) and the second pipe body layer (4); the flame-retardant layer (5) is wrapped on the second pipe body layer (4), and the sheath layer (6) is extruded on the flame-retardant layer (5).

2. The MPP cable protection tube of claim 1, wherein: the strength layer is a framework layer formed by taking glass fibers as a main reinforcing medium.

3. The MPP cable protection tube of claim 1, wherein: the main materials of the first pipe body layer (2) and the second pipe body layer (4) are both modified polypropylene; the first pipe body layer (2) and the second pipe body layer (4) are extruded by the same extruder, and the strength layer (3) is extruded by the other extruder; the melt extruded by the two extruders enters a three-channel die and is co-extruded through the same die orifice to obtain a pipe body structure formed by integrating a first pipe body layer (2), a strength layer (3) and a second pipe body layer (4).

4. The MPP cable protection tube of claim 1, wherein: the flame-retardant layer (5) is a low-smoke halogen-free flame-retardant wrapping tape, a mica wrapping tape or a ceramic silicon rubber tape.

5. The MPP cable protection tube of claim 1, wherein: the sheath layer (6) is a modified polypropylene extrusion coating layer or a CPVC extrusion coating layer.

6. The MPP cable protection tube of claim 1, wherein: the inner surface of the first pipe body layer (2) is also provided with a heat insulation coating (1).