Anti-frost-heaving flame-retardant signal cable

Abstract

The utility model discloses an anti-frost-heaving flame-retardant signal cable, and belongs to the technical field of cables. Comprising a cable core, a shielding layer, an anti-frost heaving force layer, a wrapping layer and an outer sheath. The outer side of the cable core is wrapped by the shielding layer, the outer side of the shielding layer is wrapped by the anti-frost heaving force layer, the anti-frost heaving force layer is wrapped by the wrapping layer, and the outer side of the wrapping layer is wrapped by the outer sheath. When the signal cable is applied to a frozen soil region, the signal cable can meet the flame retardance and cold resistance at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to an anti-freezing and swelling flame-retardant signal cable. Background Art

[0002] With the acceleration of urbanization, signal cables, as an important product for railway branch lines and rail transit signal and power transmission, are gradually increasing in proportion and covering a wider range. The laying environment is becoming more and more complex, and as a result, there are more and more special functional requirements for cables other than transmission, such as high temperature resistance, crack resistance, rodent resistance, termite resistance, and UV resistance.

[0003] In some permafrost or seasonally frozen areas, the volume increases by 9% during the formation of frozen soil, and its expansion force can be as large as 0.5-1.0 MPa. During the laying process of cables, the frost heaving force can easily cause the sheath layer to crack, and the frost heaving force will increase the stress on the cable, thereby affecting the internal structure of the cable core and affecting the normal use of the cable.

[0004] The application number CN201720509792.4 relates to an antifreeze cable. The utility model discloses an antifreeze power cable with a cold-resistant sheath layer, including an inner core, a filling layer wrapped around the outside of the inner core, an inner sheath arranged on the outside of the filling layer, a steel belt armor wrapped around the outside of the inner sheath, a flexible winding layer wrapped around the outside of the steel belt armor, and a cold-resistant sheath layer arranged on the outside of the flexible winding layer; the number of the inner core is at least one. The flexible winding layer in the utility model can prevent the steel belt from scratching the sheath when the cable is bent, and the cold-resistant sheath layer can ensure that the cable works in a low temperature environment. For ordinary low temperature environments, this structure can meet the use requirements, but for use in frozen soil areas, the cable's anti-freeze expansion strength is insufficient, the external pressure squeezes the outer sheath, causing the internal structure to change, and the sheath is deformed due to the force and damaged. At the same time, this patent does not involve flame retardant performance design, but is just an ordinary cold-resistant cable.

[0005] Application No. CN201520160312.9 relates to a cold-resistant signal cable for high-altitude areas. The utility model discloses a cold-resistant signal cable for high-altitude areas. The signal cable has a composite outer sheath and a cold-resistant configuration: first, an anti-twist layer is provided. Since the inner layer is filled with powdered material, when the cable is twisted, the powdered material flows between the outer sheath layer and the anti-twist layer, so it is not easy to cause the internal layers to twist, that is, the twisting phenomenon is resolved by the anti-twist layer, so the inner layer of the cable is not easily damaged by the twisting; and a number of convex points are provided on the surface of the cold-resistant outer sheath layer, which increases the force area and force uniformity of the outer sheath layer, thereby further improving its anti-twist performance; a support layer is also provided, and its consideration is that during the movement of the cable, the outer sheath layer is not easily squeezed by the pressure of the gas, so that the outer sheath layer can maintain a circular cross-section to the maximum extent. The utility model uses powdered material filled inside to dissolve the anti-twist layer, making the cable less likely to be damaged due to twisting, but it cannot prevent the internal metal armor layer from scratching the sheath layer due to the warping and protrusions during the twisting process. A number of convex points are set on the surface of the cold-resistant outer sheath layer, which increases the force-bearing area and force uniformity of the outer sheath layer, further improves its anti-twist performance, and greatly increases the complexity of the production process. Finally, the support layer is set by inflation, and the internal channel is opened, the air flow is accelerated, and the flame retardant performance of the product cannot be guaranteed.

[0006] Therefore, the existing signal cables used in permafrost areas cannot meet the requirements of both flame retardancy and cold resistance. Utility Model Content

[0007] In view of the problem that signal cables in the prior art cannot simultaneously meet the flame retardancy and cold resistance properties in permafrost areas, the utility model provides a frost-proof and flame-retardant signal cable. When the signal cable is used in permafrost areas, it can simultaneously meet the flame retardancy and cold resistance properties.

[0008] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.

[0009] A frost-proof and flame-retardant signal cable comprises a cable core, a shielding layer, an anti-frost-proof force layer, a wrapping layer and an outer sheath; the outer side of the cable core is wrapped by the shielding layer, the outer side of the shielding layer is wrapped by the anti-frost-proof force layer, the anti-frost-proof force layer is wrapped by the wrapping layer, and the outer side of the wrapping layer is wrapped by the outer sheath.

[0010] Optionally, it also includes an inner sheath; the outer side of the inner sheath is wrapped with an anti-freezing expansion layer.

[0011] Optionally, the anti-freezing expansion layer includes a first armor layer and a second armor layer; the first armor layer wraps around the outer side of the shielding layer; the outer side of the first armor layer is wrapped by the second armor layer, and the outer side of the second armor layer is wrapped by the wrapping layer.

[0012] Optionally, the first armor layer is a steel belt armor layer.

[0013] Optionally, the second armor layer is made of galvanized steel strip.

[0014] Optionally, the thickness of the second armor layer is not less than 0.5 mm, and the overlapping rate is controlled to be not less than 60%.

[0015] Optionally, the wrapping layer is a flexible wrapping layer, and the material is halogen-free low-smoke flame-retardant glass ribbon.

[0016] Optionally, the wrapping layer has a thickness ranging from 0.15 mm to 0.2 mm and is wrapped overlappingly outside the anti-freezing expansion layer.

[0017] Optionally, the shielding layer is a metal shielding layer.

[0018] Optionally, the outer sheath is a cold-resistant thermoplastic low-smoke halogen-free polyolefin sheath.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] The utility model provides a frost heave-proof flame-retardant signal cable for use in frozen soil areas. The purpose of the utility model is to solve the risk of the cable being squeezed due to frost heave force in frozen soil or seasonal frozen soil areas, causing the inner layer structure of the cable to change due to external force, thus affecting normal production and use, and the risk of the sheath layer being squeezed and cracked. On the basis of meeting the electrical performance requirements, a layer of halogen-free, low-smoke, flame-retardant glass ribbon is overlapped and wrapped between the steel belt armor and the outer sheath, and a layer of black cold-resistant flame-retardant thermoplastic low-smoke halogen-free polyolefin sheath is extruded on the outer sheath, and the flame retardant grade passes the flame retardant test, so as to prevent the spread of fire and reduce the toxic hazards and losses caused by fire.

[0021] The utility model provides a frost-swelling and flame-retardant signal cable, which enables the signal cable to have excellent transmission performance in some perennial frozen soil or seasonal frozen soil areas; it solves the risk that the cable is squeezed due to frost heaving force in frozen soil or seasonal frozen soil areas, so that the inner layer structure of the cable changes due to external force, thus affecting normal use, and the risk of the sheath layer being squeezed and cracked, thereby improving the cold resistance of the signal cable. On the basis of meeting the electrical performance, a wrapping layer is provided between the steel belt armor and the outer sheath to prevent the spread of fire, reduce the toxic hazards and losses caused by the fire, and improve the combustion-supporting property of the signal cable. Therefore, when the present application is used in frozen soil areas, it can simultaneously meet the requirements of combustion-supporting property and cold resistance, extend the service life of the signal cable, and do not need to replace the cable frequently due to the environment in the frozen soil area, saving the cost of cable replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0023] Figure 1 The utility model is a structural schematic diagram of a frost-proof and flame-retardant signal cable.

[0024] In the figure, 1 is the cable core; 2 is the shielding layer; 3 is the inner sheath; 4 is the first armor layer; 5 is the second armor layer; 6 is the wrapping layer; and 7 is the outer sheath. DETAILED DESCRIPTION

[0025] In order to make the technical scheme in the utility model better understood by the personnel in the technical field, the technical scheme in the utility model embodiment will be clearly and completely described in combination with the drawings in the utility model embodiment. Obviously, the described embodiment is only a part of the utility model embodiment, not all embodiments. Based on the embodiment in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work should belong to the scope of protection of the utility model. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a centered element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only embodiment.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] The utility model discloses an anti-freezing and flame-retardant signal cable, comprising a cable core 1, a shielding layer 2, an inner sheath 3, an anti-freezing and force layer, a wrapping layer 6 and an outer sheath 7.

[0028] The anti-freezing expansion layer includes a first armor layer 4 and a second armor layer 5 .

[0029] like Figure 1As shown, the shielding layer 2 wraps the cable core 1, the inner sheath 3 wraps the shielding layer 2, the inner sheath 3 is comprised of a first armor layer 4, the outer side of the first armor layer 4 is wrapped by a second armor layer 5, the outer side of the second armor layer 5 is wrapped by a wrapping layer 6, and the outer side of the wrapping layer 6 is wrapped by an outer sheath 7.

[0030] The cable core 1 is composed of a high-density polyethylene insulated single wire.

[0031] The shielding layer 2 is a metal shielding layer, and the best choice is an aluminum metal tape.

[0032] The first armor layer 4 is a steel belt armor layer; the second armor layer 5 is a galvanized steel belt, the thickness of the second armor layer 5 is not less than 0.5 mm, and the overlap rate is controlled to be not less than 60%.

[0033] The wrapping layer 6 is a flexible wrapping layer, which is made of halogen-free low-smoke flame-retardant glass ribbon with a thickness of 0.15mm-0.2mm and an oxygen index of ≥50%. It is overlapped and wrapped outside the anti-freezing expansion layer with an overlap rate of 15%-20%, and has good flame retardant and protective buffering effects.

[0034] The outer sheath 7 adopts a black cold-resistant thermoplastic low-smoke halogen-free polyolefin sheath, with an oxygen index of ≥32%, cold resistance up to -40°C, a sheath thickness of 1.8mm-2.0mm, which can prevent the spread of flames during combustion, release no halogen acid gas, release very little toxic and corrosive gas, and produce low smoke concentration, thus improving the flame retardant, low smoke and halogen-free performance of the cable.

[0035] The anti-freezing and swelling force layer in the utility model comprises a first armor layer 4 and a second armor layer 5. The anti-freezing and swelling force layer formed by the first armor layer 4 and the second armor layer 5 can resist a strength of about 1.0 MPa. When the cable is squeezed by an external force, the strength of the second armor layer 5 makes it difficult for the internal cable core structure to change, that is, the pressure phenomenon of the frost heaving force layer is resolved, so that the inner cable core structure is not easily damaged by squeezing.

[0036] The utility model arranges a wrapping layer 6 on the outside of the antifreeze expansion layer, and an outer sheath 7 is arranged on the outside of the wrapping layer 6. The wrapping layer 6 is a flexible wrapping tape, and the outer sheath 7 is a cold-resistant sheath, which greatly improves the cold-resistant performance. During laying and use, the steel belt armor is less likely to scratch the cold-resistant sheath layer due to bending, which reduces the difficulty of laying and using the cable in a low-temperature environment, and better ensures the working condition of the cable in a low-temperature environment.

[0037] The purpose of the utility model is to provide a frost-proof flame-retardant signal cable for use in frozen soil areas, which can solve the problem that the cable is squeezed due to frost heave force in frozen soil or seasonal frozen soil areas, so that the inner layer structure of the cable changes due to external force, thus affecting normal use, and the risk of the sheath layer being squeezed and cracked. On the basis of meeting the electrical performance, the armor layer and the outer sheath overlap the wrapping layer to prevent the spread of fire and reduce the toxic hazards and losses caused by the fire.

[0038] Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed utility model subject matter.

[0039] The above content is a further detailed description of the utility model. It cannot be determined that the specific implementation methods of the utility model are limited to these. For ordinary technicians in the technical field to which the utility model belongs, they can make some simple deductions or substitutions without departing from the concept of the utility model, which should be regarded as belonging to the protection scope of the utility model determined by the submitted claims.

Claims

1. A frost-proof flame-retardant signal cable, characterized in that: It comprises a cable core (1), a shielding layer (2), an anti-freezing expansion layer, a wrapping layer (6) and an outer sheath (7); The outer side of the cable core (1) is wrapped by a shielding layer (2), the outer side of the shielding layer (2) is wrapped by an anti-freezing expansion layer, the anti-freezing expansion layer is wrapped by a wrapping layer (6), and the outer side of the wrapping layer (6) is wrapped by an outer sheath (7).

2. The anti-freeze expansion flame-retardant signal cable according to claim 1, characterized in that: Also includes an inner sheath (3); The outer side of the inner protective sheath (3) is wrapped with an anti-freezing expansion layer.

3. The anti-freeze expansion flame-retardant signal cable according to claim 1, characterized in that: The anti-freezing expansion layer comprises a first armor layer (4) and a second armor layer (5); The first armor layer (4) wraps around the outer side of the shielding layer (2); the outer side of the first armor layer (4) is wrapped by the second armor layer (5); and the outer side of the second armor layer (5) is wrapped by the wrapping layer (6).

4. The anti-freeze expansion flame-retardant signal cable according to claim 3, characterized in that: The first armor layer (4) is a steel belt armor layer.

5. The anti-freeze expansion flame-retardant signal cable according to claim 3, characterized in that: The second armor layer (5) is made of galvanized steel strip.

6. The anti-freeze expansion flame-retardant signal cable according to claim 1, characterized in that: The thickness of the second armor layer (5) is not less than 0.5 mm, and the overlapping rate is controlled to be not less than 60%.

7. The anti-freeze expansion flame-retardant signal cable according to claim 1, characterized in that: The wrapping layer (6) is a flexible wrapping layer, and the material is halogen-free low-smoke flame-retardant glass ribbon.

8. The anti-freeze expansion flame-retardant signal cable according to claim 1, characterized in that: The thickness of the wrapping layer (6) is in the range of 0.15 mm to 0.2 mm, and is overlapped and wrapped outside the anti-freezing expansion layer.

9. The anti-freeze expansion flame-retardant signal cable according to claim 1, characterized in that: The shielding layer (2) is a metal shielding layer.

10. The anti-freeze expansion flame-retardant signal cable according to claim 1, characterized in that: The outer sheath (7) is a cold-resistant thermoplastic low-smoke halogen-free polyolefin sheath.

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