CN217334869U - Sealing structure between metal sleeve sealed cable and cable accessory - Google Patents

Abstract

The utility model relates to a sealing structure for sealing between a cable and a cable accessory with a metal sleeve, which comprises a cable and a tail pipe. The part to be sealed of the cable comprises a metal sheath, the surface of the metal sheath is provided with a bottom lead, and the bottom lead has a high thickness The wave crest on the surface of the metal sheath; the part to be sealed of the tail pipe is coated with solder paste and lead strips from the inside to the outside; the outer side of the part to be sealed of the cable and the tail pipe is welded with a lead seal, and the outer surface of the lead seal is covered with an epoxy coating. The cladding, the metal sheath part and the outer side of the lead seal are overlapped with waterproof insulating tape, the lead seal as a whole is within the coverage of the waterproof insulating tape, and the upper and lower edges of the waterproof insulating tape outside the lead seal are wrapped with butyl waterproof sealing tape. The outer side of the sealed waterproof insulating tape is provided with a heat shrinkable tube, and both ends of the heat shrinkable tube are sequentially provided with a waterproof insulating tape and a 3MPVC tape from the inside to the outside. Compared with the prior art, the utility model ensures the sealing effect, can protect the cable insulation from damage, and is stable and reliable.

Description

A sealing structure between a metal sleeve sealing cable and cable accessories

technical field

The utility model relates to the technical field of high-voltage cable sealing, in particular to a sealing structure between a metal sleeve sealing cable and a cable accessory.

Background technique

The high-voltage cable is made of cross-linked polyethylene material to achieve insulation effect. The outside is usually made of aluminum sheath and PE outer sheath for waterproofing, and the aluminum sheath also undertakes the function of grounding. It is usually welded with braided tape, wrapped with epoxy on the outside or welded directly with lead strips. The current problem is that after long-term stress on the welding part, the interface between the solder and the metal sheath of the cable is cracked, the strength of the welding part is insufficient, and the tensile cracking, the aging cracking of the epoxy layer, the cracking of the epoxy layer, etc. Moisture damage.

Utility model content

The purpose of this utility model is to overcome the above-mentioned prior art that the solder and cable metal sheath interface cracking, insufficient strength of the welding site, tensile cracking, epoxy cracking, etc. occur after the welding part is subjected to long-term stress, resulting in electrical connection disconnection or The defect of the cable being damaged by moisture provides a sealing structure between the metal sleeve sealing the cable and the cable accessories.

The purpose of the present utility model can be achieved through the following technical solutions:

A sealing structure for sealing between a cable and a cable accessory with a metal sheath, including a cable and a tail pipe, the part to be sealed of the cable includes a metal sheath, the surface of the metal sheath is provided with a bottom lead, and the thickness of the bottom lead is higher than crests on the surface of the metal sheath;

The surface of the part to be sealed of the tail pipe is evenly coated with solder paste and lead strips from the inside to the outside;

A lead seal is welded on the outside of the part to be sealed as a whole of the cable and the tail pipe, the outer surface of the lead seal is covered with an epoxy coating layer, the metal sheath part and the outside of the lead seal are overlapped with a waterproof insulating tape, and the lead seal The whole is within the coverage of the waterproof insulating tape, the upper and lower edges of the waterproof insulating tape outside the lead seal are wrapped with butyl waterproof sealing tape, and the outside of the waterproof insulating tape outside the lead seal is provided with a heat shrinkable tube. Both ends of the shrinking tube are sequentially provided with waterproof insulating tape and 3M PVC tape from inside to outside.

Further, the length of the to-be-sealed portion of the cable is within the range of 200-300 mm.

Further, the length of the bottom lead is within the range of 150-180mm.

Further, the thickness of the bottom lead is 3-5mm higher than the surface wave crest of the metal sheath.

Further, the length of the lead seal is not less than 120mm, and the thickness of one side is not less than 12mm.

Further, the length of the overlapping area between the metal sheath part of the cable and the outer side of the lead seal and the overlapping area of the metal sheath of the cable is within the range of 50-60mm, and the other side is beyond the edge of the lead seal. The length is within the range of 50-60mm.

Further, the lead seal and the metal sheath of the cable are overlapped with two layers of waterproof insulating tapes.

Further, the epoxy coating layer comprises a combination of at least three layers of epoxy casting agent and alkali-free glass ribbons arranged in sequence, and a layer of epoxy casting agent coated on the outermost side.

Further, both ends of the heat shrinkable tube are wrapped with two layers of waterproof insulating tape.

Further, the waterproof insulating tape at both ends of the heat shrinkable tube is wrapped with two layers of 3M PVC tape.

Compared with the prior art, the utility model has the following advantages:

(1) The utility model wraps the epoxy glass ribbon on the outside of the lead seal, and the epoxy forms a high-strength shell close to the lead seal layer outside the lead seal after curing. When the lead seal material is stretched by external force, due to The unique creep characteristics of its material at room temperature are prone to deformation. The cured shell of epoxy glass ribbon can form external constraints on the lead seal, offset its deformation stress, and ensure that the lead seal maintains its original structural shape without obvious deformation or early cracking. .

(2) Weld the metal sheath of the cable and the tail pipe through lead sealing to form the first layer of waterproof sealing structure and complete the electrical connection.

(3) The second layer of waterproof sealing structure is formed by connecting with the outer sheath of the cable through the sealing structure composed of waterproof insulating tape, heat shrinkable tube and waterproof sealing strip.

(4) By arranging a butyl rubber sealing strip at the mouth of the heat shrinkable tube, the problem of adhesion between the outer sheath of the cable and the heat shrinkable tube is solved. The outer sheath of the cable and the heat-shrinkable tube are generally made of PE material, which cannot be fused to each other, and can only be filled with other materials to obtain the sealing effect. Butyl rubber sealing strip has good flexibility, good adhesion with PE material, and has better aging resistance than ethylene propylene rubber. It will not age and crack after long-term use, which solves the problem of waterproof sealing between heat shrinkable tube and cable outer sheath.

Description of drawings

1 is a schematic diagram of a sealing structure between a metal sleeve sealing cable and a cable accessory provided in an embodiment of the present invention;

In the picture, 1. Bottom lead, 2. Lead seal, 3. Epoxy coating, 4. Waterproof insulating tape, 5. Butyl waterproof sealing tape, 6. Heat shrinkable tube, 7. 3M PVC tape.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that is usually placed when the utility model product is used, only for the convenience of describing the present utility model and simplifying the description, not Indicates or implies that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present invention.

It should be noted that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present application, "plurality" means two or more, unless otherwise expressly and specifically defined.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined.

Example 1

As shown in FIG. 1 , the present embodiment provides a sealing structure for sealing between a cable and a cable accessory with a metal sheath, including a cable and a tail tube, the part of the cable to be sealed includes a metal sheath, and the surface of the metal sheath is provided with a bottom Lead 1, the thickness of the bottom lead 1 is higher than the crest of the surface of the metal sheath;

The surface of the tail pipe to be sealed is evenly coated with solder paste and lead strips from the inside to the outside;

A lead seal 2 is welded on the outside of the part to be sealed as a whole of the cable and the tail pipe. The outer surface of the lead seal 2 is covered with an epoxy coating layer 3. The metal sheath part and the outside of the lead seal 2 are overlapped with a waterproof insulating tape 4. The seal 2 as a whole is within the coverage of the waterproof insulating tape 4, the upper and lower edges of the waterproof insulating tape 4 outside the lead seal 2 are wrapped with butyl waterproof sealing tape 5, and the outside of the waterproof insulating tape 4 outside the lead seal 2 is provided with heat shrinkable Tube 6, both ends of the heat shrinkable tube 6 are sequentially provided with waterproof insulating tape 4 and 3M PVC tape 7 from the inside to the outside.

The length of the part to be sealed of the cable is within the range of 200-300mm,

The length of the bottom lead 1 is within the range of 150-180mm, and the thickness of the bottom lead 1 is 3-5mm higher than the surface wave crest of the metal sheath;

The length of the 2 parts of the lead seal is not less than 120mm, the two sides are not less than 60mm, and the thickness of one side is not less than 12mm;

The length of the overlapping area between the metal sheath part of the cable and the lead seal 2 is within the range of 50-60mm, and the length of the overlap area on one side of the metal sheath of the cable 4 beyond the edge of the lead seal 2 is 50 mm. Within the range of -60mm;

The lead seal 2 and the metal sheath of the cable are overlapped with two layers of waterproof insulating tape 4;

The epoxy coating layer 3 comprises a combination of at least three layers of epoxy casting agent and alkali-free glass ribbon arranged in sequence, and a layer of epoxy casting agent coated on the outermost side;

Both ends of the heat shrinkable tube 6 are wrapped with two layers of waterproof insulating tapes 4 , and the waterproof insulating tapes 4 at both ends of the heat shrinkable tube 6 are wrapped with two layers of 3M PVC tapes 7 .

The following provides a specific implementation process of the sealing structure between a metal sleeve sealing cable and a cable accessory:

Use a knife to strip off the outer sheath of the cable part to be sealed, and strip the length of about 250mm to expose the metal sheath.

Heat the metal sheath with a heating tool to melt the asphalt on the surface of the metal sheath and wipe it with a clean cloth.

Use a wire brush to remove the oxide layer on the surface of the metal sheath, use an aluminum electrode as a primer, brush the wire brush three times, and apply the aluminum electrode twice to form a rough texture, metallic luster surface, and no lumpy solder.

The bottom lead 1 is lined with lead welding rod, and the lead rod is melted with a flame gun, piled up at the welding position, and compacted in a semi-molten state. 100-150mm from the end of the bottom lead position, fix the thermocouple for temperature measurement with high temperature resistant tape. In order to obtain accurate data, the thermocouple should be close to the aluminum sheath, and the temperature during the welding process should be controlled below 230 ℃.

Sandpaper the surface of the tail pipe to remove the oxide layer on the surface, and apply it evenly with solder paste. After heating the surface of the copper tail pipe, the lead strips are evenly smeared, and the coating is even and without omission.

Fix the position of the tail pipe and the cable, use a flame gun to melt the lead strips, accumulate them at the welding position, and compact them in a semi-molten state. At 12mm, internal compaction, no delamination and smooth external surface are required. The temperature of the welding process should be controlled below 230℃, and the operation time should be controlled within 15 minutes.

Mix the components of the epoxy cold casting agent fully, apply a layer of epoxy casting agent on the surface of the lead seal, and wrap a layer of 25mm wide alkali-free glass ribbon with a half-lap cover. Apply a layer of epoxy casting agent on the surface of the glass ribbon, then wrap a layer of alkali-free glass ribbon, repeat at least 3 layers, and finally apply a layer of epoxy casting agent on the surface, and wait for curing to form an epoxy coating layer 3.

150%~200% stretch wrapping 3M 2228# waterproof insulating tape 4 two layers at the part of the sealing lead and the metal sheath of the cable, one side is overlapped with the outer sheath of the cable by 50-60mm, and the other side is beyond the edge of the sealing lead 50-60mm.

Wrap a layer of butyl waterproof sealant strip 5 on the upper and lower edges of the waterproof tape;

Heat and shrink the heat shrinkable tube 6 on the surface of the waterproof insulating tape. The heating should be uniform, so that the shrinkage thickness is uniform, and there is no high temperature carbonization.

Two layers of 3M 2228# waterproof tape 4 are wrapped around the two ports of the heat shrinkable tube respectively, and two layers of 3M PVC tape 7 are wrapped around the outside of the waterproof tape.

The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, any technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the prior art according to the concept of the present invention shall fall within the protection scope determined by the claims. .

Claims (10)

1. A sealing structure between a metal sleeve sealed cable and a cable accessory comprises the cable and a tail pipe, and is characterized in that a part to be sealed of the cable comprises a metal sheath, the surface of the metal sheath is provided with bottom lead (1), and the thickness of the bottom lead (1) is higher than the wave crest on the surface of the metal sheath;

the surface of the part to be sealed of the tail pipe is uniformly coated with soldering paste and lead bars from inside to outside;

the welding of the holistic partial outside of waiting of cable and tail pipe has lead sealing (2), and the surface covering of this lead sealing (2) has epoxy coating (3), metal sheath position and lead sealing (2) outside overlap joint have waterproof insulating sticky tape (4), lead sealing (2) whole is in within waterproof insulating sticky tape (4) coverage, the last lower limb of waterproof insulating sticky tape (4) in the lead sealing (2) outside all twines butyl waterproof sealing adhesive tape (5), the outside of waterproof insulating sticky tape (4) in the lead sealing (2) outside is equipped with pyrocondensation pipe (6), and the both ends of this pyrocondensation pipe (6) are equipped with waterproof insulating sticky tape (4) and 3M PVC sticky tape (7) from inside to outside in proper order.

2. The sealing structure of claim 1, wherein the length of the cable to be sealed is within the range of 200 mm and 300 mm.

3. A sealing arrangement between a metal-sheathed cable and a cable accessory according to claim 1, characterized in that the length of the bottom lead (1) is within the range of 150 and 180 mm.

4. A sealing arrangement between a metal-sheathed cable and a cable accessory according to claim 1, characterized in that the thickness of the base lead (1) is 3-5mm higher than the surface peaks of the metal sheath.

5. A seal arrangement between a metal-sheathed cable and a cable accessory according to claim 1, characterized in that the lead seal (2) has a length of not less than 120mm and a single-sided thickness of not less than 12 mm.

6. The sealing structure between the metal sleeve sealed cable and the cable accessory according to claim 1, wherein the length of the overlapping area of the metal sheath part of the cable and the waterproof insulating tape (4) outside the lead seal (2) and the metal sheath of the cable on one side is within the range of 50-60mm, and the length of the other side beyond the edge of the lead seal (2) is within the range of 50-60 mm.

7. The sealing structure between the metal sleeve sealed cable and the cable accessory according to claim 1, characterized in that the lead seal (2) and the metal sheath of the cable are overlapped with two layers of waterproof insulating tapes (4).

8. The sealing structure between the metal-sheathed cable and the cable accessory according to claim 1, wherein the epoxy coating layer (3) comprises a combination of at least three layers of epoxy casting agent and alkali-free glass ribbon arranged in sequence, and a layer of epoxy casting agent coated on the outermost side.

9. The sealing structure between the metal sleeve sealed cable and the cable accessory according to claim 1, wherein two layers of waterproof insulating tapes (4) are wrapped around both ends of the heat shrinkable tube (6).

10. The sealing structure between the metal sleeve sealed cable and the cable accessory according to claim 9, wherein two layers of 3M PVC tapes (7) are wrapped around the outside of the waterproof insulating tapes (4) at the two ends of the heat shrinkable tube (6).

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