An anti-oxidation and fire-proof PVC cable

Abstract

The present invention discloses an anti-oxidation fireproof PVC cable, comprising a wire core assembly, a copper mesh shielding layer, an airtight insulating layer, a first insulating layer, a waterproof layer, a sheath layer, a fireproof layer and an outer jacket layer arranged in sequence from the inside to the outside, the wire core assembly comprises a plurality of wire cores centrally symmetrically built into the copper mesh shielding layer, the outer side of each of the wire cores is sequentially coated with a heat-resistant layer and a second insulating layer from the inside to the outside, a filling layer is arranged between the second insulating layer and the copper mesh shielding layer, the filling layer is filled with an inert gas, and one-way exhaust valves and one-way air intake valves are arranged alternately on the outer side of the airtight insulating layer around the central axis, the one-way exhaust valves and the one-way air intake valves are both connected to the filling layer, so that the space between the airtight insulating layer and the first insulating layer is connected to the filling layer. The present application effectively solves the problem of poor fireproof effect of existing cables.

Description

Technical Field

[0001] The invention belongs to the technical field of power cables and relates to an anti-oxidation and fireproof PVC cable. Background Art

[0002] The vast majority of wire and cable products are products with exactly the same cross-sectional shape and are in the form of long strips. This is determined by the fact that they are used as circuits or coils in systems or equipment. Therefore, to study and analyze the structural composition of cable products, it is only necessary to observe and analyze them from the cross-section. The structural components of wire and cable products can generally be divided into four main structural components: conductors, insulation layers, shielding and protective layers, as well as filling components and tensile components. Depending on the product's use requirements and application scenarios, some products have extremely simple structures.

[0003] In the related art, in order to improve the fire prevention effect of the cable, a fireproof layer is usually coated on the outside of the cable. However, the fire prevention effect of this method is limited, especially in some special scenarios where fires are prone to occur. The existing cables are more difficult to meet the requirements. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-oxidation fireproof PVC cable, which solves the problem that the existing cables have poor fireproof effect.

[0005] The technical solution adopted by the present invention is as follows:

[0006] An anti-oxidation and fireproof PVC cable comprises a wire core assembly, a copper mesh shielding layer, an airtight insulating layer, a first insulating layer, a waterproof layer, a sheath layer, a fireproof layer and an outer jacket layer which are arranged in sequence from the inside to the outside. The wire core assembly comprises a plurality of wire cores which are centrally symmetrically built into the copper mesh shielding layer. The outer side of each of the wire cores is sequentially coated with a heat-resistant layer and a second insulating layer from the inside to the outside. A filling layer is arranged between the second insulating layer and the copper mesh shielding layer. The filling layer is filled with an inert gas. One-way exhaust valves and one-way air inlet valves are alternately arranged in sequence on the outer side of the airtight insulating layer around the central axis. The one-way exhaust valve and the one-way air inlet valve are both connected to the filling layer so that the space between the airtight insulating layer and the first insulating layer is connected to the filling layer.

[0007] Furthermore, the heat-resistant layer includes a heat-resistant silicone layer.

[0008] Furthermore, the sheath layer comprises a polyethylene sheath.

[0009] Furthermore, among the plurality of wire cores, one wire core is located at the center of the copper mesh shielding layer, and all the remaining wire cores are evenly arranged around the central wire core.

[0010] Furthermore, a plurality of baffles are arranged at intervals in the first insulating layer along the length direction, and the wire core assembly passes through the baffles.

[0011] Furthermore, an air filling tube is arranged in the filling layer along the length direction, the air filling tube passes through the baffle, and the air filling tube is provided with an air discharge port in the space isolated by the baffle.

[0012] Furthermore, the inflation tube is provided with an inflation joint at one end of the PVC cable.

[0013] Furthermore, the inflation connector is built into the end connector of the cable.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The PVC cable of the present invention comprises a wire core assembly, a copper mesh shielding layer, an airtight insulating layer, a first insulating layer, a waterproof layer, a sheath layer, a fireproof layer and an outer jacket layer which are sequentially arranged from the inside to the outside. When in use, the filling layer is filled with an inert gas, which can effectively achieve the anti-oxidation effect of the wire core and the surrounding materials. When the temperature outside the cable rises, the internal inert gas pressure increases and is released into the space between the airtight insulating layer and the first insulating layer, thereby achieving heat insulation. Similarly, when the temperature of the internal wire core rises, the inert gas is discharged from the one-way exhaust valve and enters from the one-way air inlet valve, thereby achieving the flow of the inert gas, thereby effectively cooling the wire core. Of course, when an external fire occurs, the waterproof layer, the sheath layer, the fireproof layer and the outer jacket layer are the main first line of defense. When the fire burns to the first insulating layer and is damaged, the internal inert gas is released from the damaged port due to the high pressure, which can cause continuous hypoxia at the damaged port, thereby improving the fireproof effect of the cable and solving the problem of poor fireproof effect of the existing cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative work, among which:

[0017] Figure 1 This is a schematic structural diagram of an anti-oxidation and fireproof PVC cable according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view of an oxidation-resistant and fire-resistant PVC cable according to an embodiment of the present invention.

[0019] Markings in the figure:

[0020] 10-wire core assembly; 11-wire core; 12-heat-resistant layer; 13-second insulating layer; 14-filling layer; 15-one-way exhaust valve; 16-one-way air inlet valve; 17-inflating pipe; 171-deflation port; 172-inflating connector; 18-support bar;

[0021] 20- copper mesh shielding layer;

[0022] 30-airtight insulation layer; 31-baffle;

[0023] 40- a first insulating layer;

[0024] 50-waterproof layer;

[0025] 60-sheath layer;

[0026] 70- Fire protection layer;

[0027] 80-coat layer;

[0028] 90-end fitting. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0031] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0032] As described in the background technology, the vast majority of wire and cable products are products with exactly the same cross-sectional shape and in the form of long strips. This is due to the fact that they are used as circuits or coils in systems or equipment. Therefore, to study and analyze the structural composition of cable products, it is only necessary to observe and analyze them from the cross-section. The structural elements of wire and cable products can generally be divided into four main structural components: conductors, insulation layers, shielding and protective layers, as well as filling elements and tensile elements. Depending on the product's use requirements and application scenarios, some products have extremely simple structures. In related technologies, in order to improve the fireproof effect of the cable, a fireproof layer is usually coated on the outside of the cable. However, the fireproof effect of this method is limited.

[0033] Based on this, the inventors have created an anti-oxidation and fire-proof PVC cable of the present application to solve the above-mentioned technical problems.

[0034] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0035] See also Figure 1 , Figure 2 , an anti-oxidation fireproof PVC cable, comprising a core assembly 10, a copper mesh shielding layer 20, an airtight insulating layer 30, a first insulating layer 40, a waterproof layer 50, a sheath layer 60, a fireproof layer 70 and an outer jacket layer 80 arranged in sequence from the inside to the outside. Here, it should be noted that the copper mesh shielding layer 20 is used to block external electromagnetic interference, the first insulating layer 40 is used for insulation to the outside, the waterproof layer 50 is used to prevent external water from entering, the fireproof layer 70 is used to prevent external fire from invading and causing combustion to produce toxic smoke, and the outer jacket layer 80 provides hard protection for the entire cable, such as wear resistance, toughness and structural strength.

[0036] The wire core assembly 10 includes a plurality of wire cores 11 centrally and symmetrically built into the copper mesh shielding layer 20, and the outer side of each wire core 11 is sequentially coated with a heat-resistant layer 12 and a second insulating layer 13 from the inside to the outside, and a filling layer 14 is provided between the second insulating layer 13 and the copper mesh shielding layer 20, and the filling layer 14 is filled with an inert gas. Here, the filling layer 14 has an air-permeable air gap, which allows the inert gas to flow freely in the filling layer 14. For example, the inert gas can be argon, helium, etc., and in some other scenarios, nitrogen can also be used.

[0037] The outer side of the airtight insulating layer 30 is staggered with one-way exhaust valves 15 and one-way air intake valves 16 in sequence around the central axis, and the one-way exhaust valves 15 and one-way air intake valves 16 are both connected to the filling layer 14, so that the space between the airtight insulating layer 30 and the first insulating layer 40 is connected to the filling layer 14. Here, the one-way exhaust valve 15 and the one-way air intake valve 16 are both micro valves, which are used in special scenes where fires are prone to occur, and the practical effect is good. For example, a number of support bars 18 can be set between the airtight insulating layer 30 and the first insulating layer 40.

[0038] In another embodiment, the heat-resistant layer 12 comprises a heat-resistant silicone layer. In practice, the heat-resistant silicone layer has good heat-resistant effect and low cost.

[0039] In other embodiments, the jacket layer 60 includes a polyethylene jacket.

[0040] In another embodiment, one of the plurality of wire cores 11 is located at the center of the copper mesh shielding layer 20, and all the remaining wire cores 11 are evenly arranged around the central wire core 11. In this way, the structure of the entire wire core assembly 10 is more stable and has higher structural strength.

[0041] In another embodiment, a plurality of baffles 31 are arranged in the first insulating layer 40 at intervals along the length direction, and the wire core assembly 10 passes through the baffles 31. Such an arrangement can divide the argon gas into a plurality of spaces, so that the spaces can operate independently without affecting each other.

[0042] In another embodiment, an air filling tube 17 is provided in the filling layer 14 along the length direction, the air filling tube 17 passes through the baffle 31, and the air filling tube 17 is provided with an air discharge port 171 in the space isolated by the baffle 31. Such a configuration facilitates the filling layer 14 to be inflated with an inert gas through the air discharge port 171 of the air filling tube 17. Preferably, the air filling tube 17 is provided with an air filling connector 172 at one end of the PVC cable. Preferably, the air filling connector 172 is built into the end connector 90 of the cable.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made by any technician familiar with the field within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. An anti-oxidation and fire-proof PVC cable, characterized in that: It includes a wire core assembly, a copper mesh shielding layer, an airtight insulation layer, a first insulating layer, a waterproof layer, a sheath layer, a fireproof layer and an outer jacket layer which are arranged in sequence from the inside to the outside. The wire core assembly includes a plurality of wire cores which are centrally symmetrically built into the copper mesh shielding layer. The outer side of each of the wire cores is sequentially coated with a heat-resistant layer and a second insulating layer from the inside to the outside. A filling layer is arranged between the second insulating layer and the copper mesh shielding layer. The filling layer is filled with an inert gas. One-way exhaust valves and one-way air inlet valves are alternately arranged in sequence on the outer side of the airtight insulation layer around the central axis. The one-way exhaust valve and the one-way air inlet valve are both connected to the filling layer so that the space between the airtight insulation layer and the first insulating layer is connected to the filling layer.

2. The anti-oxidation and fireproof PVC cable according to claim 1, characterized in that: The heat-resistant layer includes a heat-resistant silicone layer.

3. The anti-oxidation and fireproof PVC cable according to claim 1, characterized in that: The sheath layer comprises a polyethylene sheath.

4. The anti-oxidation and fireproof PVC cable according to claim 1, characterized in that: Among the plurality of wire cores, one wire core is located at the center of the copper mesh shielding layer, and all the remaining wire cores are evenly arranged around the central wire core.

5. The anti-oxidation and fireproof PVC cable according to claim 1, characterized in that: A plurality of baffles are arranged in the first insulating layer at intervals along the length direction, and the wire core assembly passes through the baffles.

6. The anti-oxidation and fireproof PVC cable according to claim 5, characterized in that: An air filling tube is arranged in the filling layer along the length direction, the air filling tube passes through the baffle, and the air filling tube is provided with an air discharge port in the space isolated by the baffle.

7. The anti-oxidation and fireproof PVC cable according to claim 6, characterized in that: The inflation tube is provided with an inflation joint at one end of the PVC cable.

8. The anti-oxidation and fireproof PVC cable according to claim 7, characterized in that: The inflation connector is built into the end connector of the cable.

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