Mineral insulated pre-branched cable

Abstract

The utility model provides a mineral insulated pre-branched cable, which belongs to the technical field of cable manufacturing and comprises a cable assembly, a cable core, a cable core and a cable core, the injection molding sheath wraps the main cable and the branch cable; the waterproof assembly comprises a corrugated copper sleeve, a hot melt adhesive layer and a waterproof belt, the corrugated copper sleeve is arranged on the outer side of the main cable and the outer side of the branch cable, the corrugated copper sleeve is filled with the hot melt adhesive layer, the waterproof belt wraps the hot melt adhesive layer, and the waterproof belt makes contact with the injection molding sheath. The beneficial effects of the utility model are that the gap between the corrugated copper sleeve and the injection molding material is filled with the hot melt adhesive, and then the waterproof tape is wrapped on the hot melt adhesive and is directly adhered to the corrugated copper sleeve through the hot melt adhesive; after injection molding is completed, the waterproof belt between the corrugated copper sleeve and the injection molding sheath can play a good role in water swelling, water blocking and moisture prevention.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable manufacturing, and relates to a mineral insulated pre-branched cable. Background Art

[0002] Mica tape mineral insulated corrugated copper sheath mineral insulated cable, also known as flexible mineral insulated cable, is widely used in high-rise buildings, crowded places, pipe galleries, subways as fire-fighting power supply circuits. When making branch transfers in high-rise buildings and pipe galleries, due to the unique seamless metal sheath structure of the corrugated metal sheath cable, it is difficult to cut on site, and the joint quality is unstable. Factory prefabricated branches are an effective method to improve the branch transfer quality.

[0003] Currently, the mineral insulated pre-branched cables generally have the problem of poor waterproofness of the branch body. One way to form the branch body of the mineral insulated branch cable in the industry is injection molding. Since the injection molding material and the cable sheath material are not of the same material, after long-term use, due to thermal expansion and contraction, the waterproof characteristics at both ends of the branch body will be lost; the other way is to use two metal shells fastened with screws. The sealing between the metal branch body and the cable is even worse, and it cannot prevent the entry of water vapor when immersed. Neither of them can achieve the same waterproof characteristics as the cable.

[0004] For example, the invention patent with the application number CN201810001348.0 discloses a flexible mineral insulated fireproof pre-branched cable branch head, which uses integral wrapping and then injection molding. It cannot prevent the entry of water vapor from both ends of the branch body, and due to the existence of the wrapping layer, the tightness between the injection-molded branch body and the cable is reduced, and relative slippage is likely to occur; another example is the invention patent with the application number CN201610391065.2, which discloses a mineral insulated pre-branched fireproof cable with an aluminum shell, but only uses a metal sleeve directly locked with fireproof mud, and no waterproof design is carried out at both ends and between the two outer shells, so it does not have waterproof characteristics. In summary, there is a large room for improvement in the waterproofness of the existing mineral insulated pre-branched cables. Summary of the Invention

[0005] The purpose of the utility model is to provide a mineral insulated pre-branched cable aiming at the above problems existing in the prior art.

[0006] The purpose of the utility model can be achieved by the following technical solutions: A mineral insulated pre-branched cable, comprising:

[0007] A cable assembly, which includes a main cable and branch cables;

[0008] An injection-molded sheath, which wraps the main cable and the branch cables;

[0009] A waterproof component, which includes a corrugated copper sleeve, a hot melt adhesive layer and a waterproof tape. The corrugated copper sleeve is arranged outside the main cable and the branch cable. The hot melt adhesive layer fills the corrugated copper sleeve. The waterproof tape is wound around the hot melt adhesive layer, and the waterproof tape contacts the injection molded sheath.

[0010] In the above-mentioned mineral insulated pre-branched cable, a connection component is further included. The main cable is provided with a first core, the branch cable is provided with a second core, and the connection component connects the first core and the second core.

[0011] In the above-mentioned mineral insulated pre-branched cable, a copper tape is further included. The corrugated copper sleeve of the main cable is connected to the corrugated copper sleeve of the branch cable through the copper tape. The end of the copper tape is wound around the corrugated copper sleeve to form a telescopic part, and is welded to the corrugated copper sleeve to form a welded part.

[0012] In the above-mentioned mineral insulated pre-branched cable, the connection component further includes a nylon tie strap. The first core, the second core and the copper tape pass through the nylon tie strap, and the nylon tie strap binds the first core, the second core and the copper tape.

[0013] In the above-mentioned mineral insulated pre-branched cable, a heat shrinkable tube is sleeved on the copper tape, and the heat shrinkable tube separates the copper tape from the injection molded sheath.

[0014] In the above-mentioned mineral insulated pre-branched cable, an insulating tape is further included. The insulating tape is wound around the telescopic part and the welded part, so as to separate the telescopic part and the welded part from the injection molded sheath.

[0015] In the above-mentioned mineral insulated pre-branched cable, the corrugated copper tube is curled outward to form a curled layer.

[0016] In the above-mentioned mineral insulated pre-branched cable, a silicone self-adhesive tape is arranged between the corrugated copper tube and the main cable or the branch cable.

[0017] In the above-mentioned mineral insulated pre-branched cable, the connection component further includes a branch joint. The first core and the second core are connected through the branch joint.

[0018] In the above-mentioned mineral insulated pre-branched cable, the branch joint is wound with a double-sided synthetic mica tape and a polyethylene tape, and the polyethylene tape is located outside the double-sided synthetic mica tape.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] 1. Use hot melt adhesive to fill the gap between the corrugated copper sleeve and the injection molded material, and then wrap the waterproof tape on the hot melt adhesive. The waterproof tape is directly adhered to the corrugated copper sleeve through the hot melt adhesive. After the injection molding is completed, the waterproof tape between the corrugated copper sleeve and the injection molded jacket can play a good role in water expansion, water resistance and moisture resistance.

[0021] 2. After the end of the copper tape is welded to half a circle on the corrugated copper sleeve, it is wrapped around the corrugated copper sleeve twice to form an expansion joint. The purpose of wrapping the copper tape twice is to form an expansion joint effect. When the branch head and the cable are subjected to a large bend, the expansion joint can prevent the copper tape from being broken from the welding joint.

[0022] 3. Use nylon cable ties to bundle the first wire core, the second wire core and the copper tape for fixation, and allow the injection plastic to be injected into the gaps between the wire cores. This can increase the firmness of the branch body and enable it to withstand its own weight for a long time without slipping in situations such as vertical laying.

[0023] 4. The heat shrink tube separates the copper tape from the injection molded sheath to prevent the copper tape from cutting or crushing the mica insulation layer of the wire core.

[0024] 5. Wrap electrical tape around the expansion part and the welding part to separate the expansion part and the welding part from the injection molded sheath, isolate the injection molded material, and prevent the copper tape and the injection molded material from solidifying into one. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of the mineral insulated pre-branched cable of the present invention.

[0026] Figure 2 This is a state change diagram of the corrugated copper sleeve wrapped with electrical tape in the utility model.

[0027] In the figure, 1. Main cable; 2. Branch cable; 3. Injection-molded sheath; 4. Corrugated copper sheath; 5. Hot-melt adhesive layer; 6. Waterproof tape; 7. First wire core; 8. Second wire core; 9. Copper tape; 10. Expansion part; 11. Welding part; 12. Nylon cable tie; 13. Heat shrink tubing; 14. Electrical tape; 15. Silicone self-adhesive tape; 16. Branch connector. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, in the present utility model, descriptions such as "first", "second", "one", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In the present utility model, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In addition, the technical solutions between various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present utility model. Those skilled in the art of the present utility model can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present utility model or exceed the scope defined by the appended claims.

[0034] As Figure 1 、 Figure 2 shown, a mineral insulated pre-branched cable includes: a cable assembly, an injection molded sheath 3, and a waterproof assembly.

[0035] Among them, the cable assembly includes a main cable 1 and branch cables 2.

[0036] Among them, the injection molded sheath 3 wraps the main cable 1 and the branch cables 2.

[0037] Among them, the waterproof assembly includes a corrugated copper sleeve 4, a hot melt adhesive layer 5, and a waterproof tape 6. The corrugated copper sleeve 4 is disposed outside the main cable 1 and the branch cables 2. The hot melt adhesive layer 5 fills the corrugated copper sleeve 4. The waterproof tape 6 is wound around the hot melt adhesive layer 5, and the waterproof tape 6 is in contact with the injection molded sheath 3.

[0038] Specifically, the thickness of the waterproof tape 6 is 0.3 mm, and it is wrapped around the hot melt adhesive for 2 - 3 layers, and the wrapping width is not less than 60 mm.

[0039] In this embodiment, the gap between the corrugated copper sleeve 4 and the injection molding material is filled with hot melt adhesive, and then the waterproof tape 6 is wrapped around the hot melt adhesive. The waterproof tape 6 is directly adhered to the corrugated copper sleeve 4 through the hot melt adhesive. After the injection molding is completed, the waterproof tape 6 between the corrugated copper sleeve 4 and the injection molding sheath 3 can play a good role in water swelling and water blocking and moisture proofing when encountering water.

[0040] Such as Figure 1 、 Figure 2 As shown, on the basis of the above - mentioned embodiment, a connection component is further included. The main cable 1 is provided with a first core 7, the branch cable 2 is provided with a second core 8, and the connection component connects the first core 7 and the second core 8.

[0041] Such as Figure 1 、 Figure 2 As shown, on the basis of the above - mentioned embodiment, a copper tape 9 is further included. The corrugated copper sleeve 4 of the main cable 1 and the corrugated copper sleeve 4 of the branch cable 2 are connected through the copper tape 9. The end of the copper tape 9 is wrapped around the corrugated copper sleeve 4 to form a telescopic part 10, and is welded to the corrugated copper sleeve 4 to form a welded part 11.

[0042] Specifically, the copper tape 9 is made of the waste materials left after cutting the edges of the corrugated copper sheath cable during production. At present, when producing the corrugated copper sheath cable, the method of longitudinal wrapping and edge cutting and then welding with a wide copper tape 9 is adopted. The cut copper tape 9 is basically regarded as waste products, and it can be used as the connection material for the corrugated copper sleeve 4.

[0043] In this embodiment, after the end of the copper tape 9 is welded for half a circumference on the corrugated copper sleeve 4, it is wrapped around the corrugated copper sleeve 4 for two circles to form a telescopic part 10. The purpose of wrapping the copper tape 9 for two circles is to form a telescopic joint effect. When the branch head and the cable are bent greatly, the telescopic part 10 can prevent the copper tape 9 from being pulled off from the welded joint.

[0044] Such as Figure 1 、 Figure 2 As shown, on the basis of the above - mentioned embodiment, the connection component further includes a nylon tie - strap 12. The first core 7, the second core 8, and the copper tape 9 pass through the nylon tie - strap 12, and the nylon tie - strap 12 binds the first core 7, the second core 8, and the copper tape 9.

[0045] In this embodiment, the nylon tie - strap 12 binds the first core 7, the second core 8, and the copper tape 9 for fixation, allowing the injection molding material to be injected into the gaps between the cores, which can increase the firmness of the branch body and can withstand its own weight for a long time without slipping in vertical laying and other situations.

[0046] As Figure 1 、 Figure 2 shown, on the basis of the above-mentioned embodiment, a heat shrinkable tube 13 is sleeved on the copper strip 9, and the heat shrinkable tube 13 separates the copper strip 9 from the injection molded sheath 3.

[0047] In this embodiment, the heat shrinkable tube 13 separates the copper strip 9 from the injection molded sheath 3, preventing the copper strip 9 from cutting or pressing the mica large insulation layer of the wire core.

[0048] As Figure 1 、 Figure 2 shown, on the basis of the above-mentioned embodiment, it further includes electrical insulating tape 14, and the electrical insulating tape 14 is wound around the telescopic part 10 and the welding part 11, thereby separating the telescopic part 10 and the welding part 11 from the injection molded sheath 3.

[0049] In this embodiment, the electrical insulating tape 14 is wound around the telescopic part 10 and the welding part 11, thereby separating the telescopic part 10 and the welding part 11 from the injection molded sheath 3, isolating the injection molding material, and preventing the copper strip 9 from solidifying with the injection molding material into one body.

[0050] As Figure 1 、 Figure 2 shown, on the basis of the above-mentioned embodiment, the corrugated copper tube is formed with a curled edge layer (not marked in the figure) by curling the edge outwards.

[0051] In this embodiment, in order to prevent the edge of the corrugated copper sleeve 4 from cutting the mica tape, the corrugated copper sleeve 4 can be curled outwards with pliers to form a curled edge layer.

[0052] As Figure 1 、 Figure 2 shown, on the basis of the above-mentioned embodiment, a silicone self-adhesive tape 15 is provided between the corrugated copper tube and the main cable 1 or the branch cable 2.

[0053] In this embodiment, in order to further prevent the edge of the corrugated copper sleeve 4 from cutting the mica tape, a silicone self-adhesive tape 15 can be provided between the corrugated copper tube and the main cable 1 or the branch cable 2.

[0054] Preferably, the terminal of the waterproof tape 6 is firmly adhered with the silicone self-adhesive tape 15.

[0055] As Figure 1 、 Figure 2 shown, on the basis of the above-mentioned embodiment, the connection assembly further includes a branch joint 16, and the first wire core 7 and the second wire core 8 are connected through the branch joint 16.

[0056] In this embodiment, the branch joint 16 is a C-shaped buckle, and the C-shaped buckle is directly pressed into the first core 7 and the second core 8 through the notch to realize the fixation of the two.

[0057] As Figure 1 , Figure 2 shown, on the basis of the above embodiment, the branch joint 16 is wrapped with a double-sided synthetic mica tape (not shown in the figure) and a polyethylene tape (not shown in the figure), and the polyethylene tape is located outside the double-sided synthetic mica tape.

[0058] In this embodiment, the branch joint 16 is wrapped with a double-sided synthetic mica tape, and then a polyethylene tape is wrapped. The polyethylene tape is heated by a hot air gun to melt and form a protective layer, effectively improving the insulation stability and moisture resistance of the cable.

Claims

1. A mineral insulated pre-branched cable, characterized in that, Comprising: A cable assembly, which includes a main cable and branch cables; An injection-molded sheath that wraps the main cable and the branch cables; A waterproof assembly, which includes a corrugated copper sleeve, a hot-melt adhesive layer, and a waterproof tape. The corrugated copper sleeve is disposed outside the main cable and the branch cables. The hot-melt adhesive layer fills the corrugated copper sleeve. The waterproof tape is wound around the hot-melt adhesive layer, and the waterproof tape contacts the injection-molded sheath.

2. The mineral insulated pre-branched cable according to claim 1, characterized in that: It further includes a connection assembly. The main cable is provided with a first core, and the branch cable is provided with a second core. The connection assembly connects the first core and the second core.

3. The mineral insulated pre-branched cable according to claim 2, characterized in that: It further includes a copper tape. The corrugated copper sleeve of the main cable is connected to the corrugated copper sleeve of the branch cable through the copper tape. The end of the copper tape is wound around the corrugated copper sleeve to form a telescopic part and is welded to the corrugated copper sleeve to form a welded part.

4. The mineral insulated pre-branched cable according to claim 3, wherein: The connection assembly further includes a nylon tie. The first core, the second core, and the copper tape pass through the nylon tie, and the nylon tie binds the first core, the second core, and the copper tape.

5. The mineral insulated pre-branched cable according to claim 3, wherein: The copper tape is sleeved with a heat-shrinkable tube, and the heat-shrinkable tube separates the copper tape from the injection-molded sheath.

6. The mineral insulated pre-branched cable according to claim 5, characterized in that: It further includes electrical tape, which is wound around the telescopic part and the welded part to separate the telescopic part and the welded part from the injection-molded sheath.

7. The mineral insulated pre-branched cable according to claim 1, wherein: The corrugated copper tube is curled outward to form a curled layer.

8. The mineral insulated pre-branched cable according to claim 1, characterized in that: A silica gel self-adhesive tape is provided between the corrugated copper tube and the main cable or the branch cable.

9. The mineral insulated pre-branched cable according to claim 2, characterized in that: The connection assembly further includes a branch joint. The first core and the second core are connected through the branch joint.

10. A mineral insulated pre-branched cable as claimed in claim 9, wherein: The branch joint is wound with a double-sided synthetic mica tape and a polyethylene tape, and the polyethylene tape is located outside the double-sided synthetic mica tape.

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