CN113689982A - Mineral insulation fireproof water-blocking pre-branch cable - Google Patents
Mineral insulation fireproof water-blocking pre-branch cable Download PDFInfo
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- CN113689982A CN113689982A CN202110959532.8A CN202110959532A CN113689982A CN 113689982 A CN113689982 A CN 113689982A CN 202110959532 A CN202110959532 A CN 202110959532A CN 113689982 A CN113689982 A CN 113689982A
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- cable
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
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Abstract
The invention discloses a flexible mineral insulation fireproof water-blocking pre-branch cable, and belongs to the technical field of cable production. The cable comprises a main cable, branch cable and connector, branch cable passes through the connector and connects on main cable, main cable and branch cable structure are the same, all from inside to outside by the conductive core, the insulating layer, copper metal spacer sleeve, the oversheath constitutes, the connector includes from inside to outside sets gradually the C type copper crimping ring at main cable and branch cable junction, the mineral insulation layer, connector copper metal spacer layer, water-blocking layer and connector outer jacket, all be provided with the waterproof cover of pyrocondensation on connector and main cable and branch cable's the connector. The cable has excellent fireproof and water-blocking performances, good insulating performance, corrosion resistance and wear resistance, can replace a rigid fireproof mineral insulating pre-branched cable, reduces the manufacturing, installation and maintenance costs, is convenient to construct, thoroughly solves the problem that the cable breaks down and other operation faults frequently caused by water inflow of the cable, and is convenient to popularize and use.
Description
Technical Field
The invention relates to the technical field of cable production, in particular to a mineral insulation fireproof water-blocking pre-branch cable.
Background
With the continuous increase of national economy of China, the speed of development of various infrastructures and real estate is accelerated, the power cable serving as a main power supply, distribution and distribution way in various building facilities becomes a main power distribution way, and due to the economic and technical superiority, the pre-branch cable is widely applied to residential buildings, office buildings, business and trade buildings, teaching buildings, scientific research buildings and other middle and high-rise buildings as a main power supply and distribution way.
The pre-branch cable is characterized in that a plurality of branch cables are led out from a main cable line, the branch cables are connected with a main cable through conductor compression, insulating layer wrapping and protective layer injection molding before the cable leaves a factory, and when the cable is laid, the branches are led out to each power utilization place, so that the construction difficulty of a cable joint is greatly reduced, and the reliability of the joint is improved. Along with increasing importance to safety of the country, the cable has higher requirements on the fireproof performance of cables laid in high-rise buildings, rigid mineral insulation fireproof cables are mostly used in the market, and although the cable has better fireproof performance, the cable cannot be produced in large length due to limited manufacturing length, and has poor bending performance, so that the problems of high laying difficulty, more joints, special joints, complex operation, high cost and the like are caused, and particularly, the pre-branch cable made of rigid mineral insulation has higher manufacturing, laying and maintaining difficulties and higher cost.
The main cable is usually laid vertically in the pre-branch cable laying process, if water enters a laying well, the water easily flows downwards along the cable, because the protective layer of the branch connecting body is formed by subsequent injection molding, the end part of the connecting body is bent and twisted in the cable coiling and laying process, the end part of the connecting body and the cable body can be loosened and generate a gap, the water can permeate into the insulating wrapping layer from the gap, the insulating property of an insulating layer is greatly reduced, particularly, the insulation of the mineral insulated cable is a mineral material, if a little moisture enters, the insulating property of the cable can be rapidly reduced, the cable is broken down, the power supply interruption is caused, and great loss is brought to a user.
Disclosure of Invention
The invention aims to provide a mineral insulation fireproof water-blocking pre-branch cable, which solves the problems in the background technology.
The technical scheme adopted by the invention is as follows:
the utility model provides a mineral insulation fire prevention is prevented water and is divided a cable in advance, includes main cable 1, branch cable 2 and connector 3, branch cable 2 passes through connector 3 and connects on main cable 1, main cable 1 is the same with branch cable 2 structure, all constitutes by conductive core 4, insulating layer 5, copper metal spacer 6, oversheath 7 from inside to outside, connector 3 includes that C type copper pressure joint ring 8, mineral insulating layer 9, connector copper metal isolation layer 10, water blocking layer 11 and connector outer jacket 12 that set gradually in main cable 1 and branch cable 2 junction from inside to outside, all be provided with pyrocondensation waterproof cover 13 on connector 3 and main cable 1 and branch cable 2's the link.
The conductive wire core 4 is formed by round copper stranded compacted conductors.
The insulating layer 5 is formed by winding 5-8 layers of mineral insulating tapes and two layers of reinforcing isolation tapes, the mineral insulating tapes are made of high-temperature-resistant synthetic mica tapes, and the reinforcing isolation tapes are made of high-flame-retardant glass ribbon tapes.
The copper metal spacer bush 6 is a sealed copper pipe formed by cladding and welding a copper strip.
The outer sheath 7 is formed by extruding and wrapping a high-flame-retardant low-smoke halogen-free polyolefin material.
The mineral insulating layer 9 is formed by winding 5-8 layers of mineral insulating tapes and reinforcing isolation tapes by hand.
The connector copper metal spacer layer 10 is formed by manually winding four layers of copper tape.
The water-blocking layer 11 is formed by manually wrapping three layers of water-blocking tapes.
The outer protective layer 12 of the connector is formed by integrally extruding a layer of high-flame-retardant low-smoke halogen-free polyolefin material by using an injection molding machine.
The thermal shrinkage waterproof jacket 13 is formed by compounding and processing an outer layer cross-linked polyolefin material and an inner layer hot melt adhesive, one end of the thermal shrinkage waterproof jacket 13 is tightly sleeved on the outer sheath 7 of the main cable or the branch cable, and the other end of the thermal shrinkage waterproof jacket is tightly sleeved on the outer sheath 12 of the connector.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the invention, the water-blocking layer and the thermal shrinkage waterproof sleeve which are arranged for blocking water are arranged, so that after the cable is laid, even in a water environment, water cannot enter the connector, and the normal operation of the cable is ensured; meanwhile, the thermal shrinkage waterproof jacket with large cable bending in the production and laying processes can prevent cracking.
The cable has excellent fireproof and water-blocking performances, good insulating performance, corrosion resistance and wear resistance, can replace a rigid fireproof mineral insulating pre-branched cable, reduces the manufacturing, installation and maintenance costs, is convenient to construct, and thoroughly solves the problem that the cable breaks down and other operation faults frequently occur due to water inflow of the cable.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of a main cable and a branch cable of the present invention;
shown in the figure: a main cable 1; a branch cable 2; a linker 3; a conductive wire core 4; an insulating layer 5; a copper metal spacer 6; an outer sheath 7; a C-shaped copper crimping ring 8; a mineral insulation layer 9; a connector copper metal isolation layer 10; a water-resistant layer 11; a connector outer jacket 12; a heat-shrinkable waterproof jacket 13.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments and accompanying drawings further illustrate the present invention in detail.
Examples
As in fig. 1 to 2, this embodiment provides a branch cable is in advance prevented water by mineral insulation, including main cable 1, branch cable 2 and connector 3, branch cable 2 passes through connector 3 and connects on main cable 1, main cable 1 and branch cable 2 are the same in structure, all constitute by conductive core 4, insulating layer 5, copper metal spacer 6, oversheath 7 from inside to outside, connector 3 includes C type copper crimp ring 8, mineral insulating layer 9, connector copper metal isolation layer 10, water blocking layer 11 and connector outer jacket 12 that sets gradually in main cable 1 and branch cable 2 junction from inside to outside, all be provided with pyrocondensation waterproof cover 13 on connector 3 and the connecting terminal of main cable 1 and branch cable 2.
The conductive wire core 4 is formed by twisting and pressing a conductor by round copper, the surface of the pressed conductor is smooth, and the insulation performance of the cable is prevented from being reduced by undesirable phenomena such as burrs and the like.
The insulating layer 5 is formed by winding 5-8 layers of mineral insulating tapes and two layers of reinforcing isolation tapes, the mineral insulating tapes are made of high-temperature-resistant (temperature resistant is 1000 ℃ and does not break down in 90 minutes) synthetic mica tapes, the reinforcing isolation tapes are made of high-flame-retardant glass fiber tapes, the mica insulating layers are mainly protected, the mica layers on the mica tapes are prevented from falling off under high temperature and vibration, and the insulating property of the cable is reduced.
The copper metal isolation sleeve 6 is formed by cladding and welding a copper strip to form a closed copper tube cladded on the main cable and the branch cable insulation layer 5, and mainly plays roles of heat insulation, oxygen isolation and prevention of moisture or humidity from entering the insulation layer.
The outer sheath 7 is formed by extruding and wrapping a high-flame-retardant low-smoke halogen-free polyolefin material, and mainly prevents the copper metal isolation sleeves 6 of the main cable and the branch cables from being corroded, so that the cable is protected.
The mineral insulating layer 9 is formed by manually winding 5-8 layers of mineral insulating tapes and reinforcing isolation tapes, the mineral insulating tapes are made of high-temperature-resistant (temperature resistant 1000 ℃ and no breakdown for 90 minutes) synthetic mica tapes, and the reinforcing isolation tapes are made of high-flame-retardant glass fiber tapes, so that the mica insulating layers are protected, the mica layers on the mica tapes are prevented from falling off under high temperature and vibration, and the insulating property of the cable is reduced.
The connector copper metal spacer layer 10 is formed by manually winding four layers of copper tape.
The water-blocking layer 11 is formed by wrapping three layers of water-blocking tapes manually, the water-blocking layer 11 is mainly formed by the fact that the volume of the water-blocking tapes expands rapidly by multiple times after the water-blocking tapes meet water, the tape is completely filled in gaps to form a sealed space, and moisture is cut off to further enter the mineral insulating layer 9 of the connecting body.
The outer protective layer 12 of the connector is formed by integrally extruding a layer of high-flame-retardant low-smoke halogen-free polyolefin material by using an injection molding machine.
The thermal shrinkage waterproof jacket 13 is formed by compounding and processing an outer layer cross-linked polyolefin material and an inner layer hot melt adhesive, the outer layer material has the properties of insulation, corrosion resistance, wear resistance and the like, the inner layer material has the characteristics of low melting point, waterproof sealing, high adhesion and the like, one end of the thermal shrinkage waterproof jacket 13 is tightly sleeved on the outer sheath 7 of the main cable or the branch cable, and the other end of the thermal shrinkage waterproof jacket 13 is tightly sleeved on the outer sheath 12 of the connector. The thermal shrinkage sleeve forms an empty drum at the joint transition position of the outer sheaths 7 of the main cable and the branch cable and the outer sheath 12 of the connector, the thermal shrinkage sleeve cannot crack even if the thermal shrinkage sleeve is bent greatly in the production and laying processes, and a water inlet channel cannot be formed even if a gap exists at the joint position of the outer sheaths 7 of the main cable and the branch cable) and the outer sheath 12 of the connector. The waterproof layer of water blocking that sets up, the waterproof cover twice defence line of pyrocondensation for even in the environment that has the water, moisture can't enter into the connector after the cable laying, guarantees the normal operating of cable.
The specific manufacturing process of the invention is as follows:
the method comprises the following steps: and according to the number of the pre-branch cable connectors 3, sleeving heat-shrinkable waterproof sleeves 13 with the number twice that of the connectors on the main cable 1, wherein the length of each heat-shrinkable waterproof sleeve is 50-150 mm. The pipe diameter of the thermal shrinkage waterproof sleeve is 5-10mm larger than the inner diameter of the injection mould where the main cable extends out of the injection mould. A thermal shrinkage waterproof sleeve is sleeved at the connecting end of each branch cable 2, the length is 40-80mm, and the pipe diameter is 3-7mm larger than the inner diameter of an injection mould where the branch cable extends out of the injection mould.
Step two: the method is the same as the method of a common pre-branching cable, the outer sheath 7 of the main cable is firstly stripped at a position needing to be crimped and branched, then the copper metal isolation sleeve 6 and the insulating layer 5 of the main cable are sequentially stripped, the stripping length of the insulating layer 5 is 2-3cm longer than that of the C-shaped copper crimping ring 8, the stripping length of the copper metal isolation sleeve 6 of the main cable is 3-4cm longer than that of the insulating layer 5 of the main cable, and the stripping length of the outer sheath 7 of the main cable is 4-5cm longer than that of the copper metal isolation sleeve 6 of the main cable. And removing the outer sheath 7, the copper metal spacer bush 6 and the insulating layer 5 of the branch cable to be connected to one end of the branch cable in sequence according to the method.
Step three: the conductive wire cores of the branch cable and the main cable are pressed together by a C-shaped copper pressing ring 8 through a pressing machine; then overlapping (overlapping rate is 40-50) 5-8 layers of 0.16mm synthetic mica tapes and two layers of 0.2mm high-flame-retardant glass fiber tapes to form a mineral insulating layer 9 of a connector, wherein the mineral insulating layer 9 is covered on the C-shaped copper compression joint ring 8, the insulating layer 5 of the main cable and the insulating layer 5 of the branch cable in a wrapping manner and covered to the cross sections of the copper metal isolation sleeve 6 of the main cable 1 and the copper metal isolation sleeve 6 of the branch cable 2; then, manually overlapping (the overlapping rate is 35-45%) 4 layers of 0.2mm copper strips to form a connector copper metal isolating layer 10, and similarly, the connector copper metal isolating layer 10 is wrapped on the mineral insulating layer 9, the copper metal isolating sleeve 6 of the main cable and the copper metal isolating sleeve 6 of the branch cable to cover the cuts of the outer sheath 7 of the main cable and the outer sheath 7 of the branch cable; then, manually overlapping (the overlapping rate is 35-45%) 3 layers of water-blocking tapes with the thickness of 0.25mm to form a water-blocking layer 11, and similarly, wrapping the water-blocking layer 11 to the sections of the main cable outer sheath 7 and the branch cable outer sheath 7.
Step four: according to the size of the cable, a proper injection mold is selected, the connector is placed in the injection mold, and a layer of high-flame-retardant low-smoke halogen-free polyolefin material is extruded on the connector by an injection molding machine to form the outer protective layer 12 of the connector.
Step five: finally, the pre-placed thermal shrinkage waterproof sleeves 13 are sleeved at the upper end and the lower end of the main cable 1 and the end parts of the branch cables, and the thermal shrinkage waterproof sleeves 13 are heated and tightened by a hot air gun to form the thermal shrinkage waterproof sleeves 13 for connecting the connecting body with the main cable and the branch cables.
And manufacturing the next connecting body according to the steps until all the connecting bodies are manufactured, and inspecting the finished product of the cable to finish the production of the cable.
The pre-branched cable manufactured by the steps passes the tests under the vibration and spraying conditions specified by the BS6387:2013 fire resistance test standard, and the fire resistance of the product completely meets the requirement of GB/T19666-2020; after the manufactured connector is placed into water to be soaked for 7x24 hours, 2.1KV is applied for 5 minutes without breakdown, and the numerical values of the insulation resistance before and after soaking of the connector are compared and tested, and are found to be consistent and unchanged. Therefore, the method has good water resistance, and completely solves the problem that the pre-branched cable is easy to enter water after being laid. The cable has excellent fireproof and water-blocking performances, is approved by users after being put into the market, and is widely used in high-rise buildings.
The above description is only exemplary of the invention, and any modification, equivalent replacement, and improvement made within the spirit and principle of the invention should be included in the protection scope of the invention.
Claims (10)
1. The utility model provides a mineral insulation fire prevention branch cable of blocking water in advance, includes main cable (1), branch cable (2) and connector (3), branch cable (2) are connected on main cable (1) through connector (3), its characterized in that: the cable is characterized in that the main cable (1) and the branch cable (2) are identical in structure and are composed of a conductive wire core (4), an insulating layer (5), a copper metal isolation sleeve (6) and an outer sheath (7) from inside to outside, the connector (3) comprises a C-shaped copper press connection ring (8), a mineral insulating layer (9), a connector copper metal isolation layer (10), a water blocking layer (11) and a connector outer sheath (12) which are sequentially arranged at the joint of the main cable (1) and the branch cable (2) from inside to outside, and the connector (3) is provided with a thermal shrinkage waterproof sleeve (13) at the connecting end of the main cable (1) and the branch cable (2).
2. The mineral-insulated fireproof water-blocking pre-branch cable according to claim 1, wherein: the conductive wire core (4) is formed by round copper stranded compacted conductors.
3. The mineral-insulated fireproof water-blocking pre-branch cable according to claim 1, wherein: the insulating layer (5) is formed by winding 5-8 layers of mineral insulating tapes and two layers of reinforcing isolation tapes, the mineral insulating tapes are made of high-temperature-resistant synthetic mica tapes, and the reinforcing isolation tapes are made of high-flame-retardant glass fiber tapes.
4. The mineral-insulated fireproof water-blocking pre-branch cable according to claim 1, wherein: the copper metal spacer bush (6) is a sealed copper pipe formed by cladding and welding a copper strip.
5. The mineral-insulated fireproof water-blocking pre-branch cable according to claim 1, wherein: the outer sheath (7) is formed by extruding and wrapping a high-flame-retardant low-smoke halogen-free polyolefin material.
6. The mineral-insulated fireproof water-blocking pre-branch cable according to claim 1, wherein: the mineral insulating layer (9) is formed by winding 5-8 layers of mineral insulating tapes and reinforcing isolation tapes manually.
7. The mineral-insulated fireproof water-blocking pre-branch cable according to claim 1, wherein: the connector copper metal isolation layer (10) is formed by manually winding four layers of copper strips.
8. The mineral-insulated fireproof water-blocking pre-branch cable according to claim 1, wherein: the water-blocking layer (11) is formed by manually wrapping three layers of water-blocking tapes.
9. The mineral-insulated fireproof water-blocking pre-branch cable according to claim 1, wherein: the outer protection layer (12) of the connector is formed by integrally extruding and injecting a layer of high-flame-retardant low-smoke halogen-free polyolefin material by using an injection molding machine.
10. The mineral-insulated fireproof water-blocking pre-branch cable according to claim 1, wherein: the thermal shrinkage waterproof jacket (13) is formed by compounding and processing an outer layer cross-linked polyolefin material and an inner layer hot melt adhesive, one end of the thermal shrinkage waterproof jacket (13) is tightly sleeved on the outer sheath (7) of the main cable or the branch cable, and the other end of the thermal shrinkage waterproof jacket is tightly sleeved on the outer sheath (12) of the connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110959532.8A CN113689982A (en) | 2021-08-20 | 2021-08-20 | Mineral insulation fireproof water-blocking pre-branch cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110959532.8A CN113689982A (en) | 2021-08-20 | 2021-08-20 | Mineral insulation fireproof water-blocking pre-branch cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113689982A true CN113689982A (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110959532.8A Pending CN113689982A (en) | 2021-08-20 | 2021-08-20 | Mineral insulation fireproof water-blocking pre-branch cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113689982A (en) |
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2021
- 2021-08-20 CN CN202110959532.8A patent/CN113689982A/en active Pending
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