Flexible oil storage type insulating sheath and preparation method thereof

Abstract

The invention discloses a flexible oil storage type insulating sheath and a preparation method thereof, and the sheath comprises a rubber tube which is provided with a thick tube end and a thin tube end; the thick pipe end and the thin pipe end of the rubber pipe are oppositely turned outwards and overlapped, and an accommodating space is formed after the overlapped parts are bonded; and lubricating liquid is injected into the accommodating space. When the cable is laid, the insulating sheath provided by the invention can be sleeved on the outer surface of the cable, and in the process that the cable is dragged to move, after the cable is in contact with the inner surface of the insulating sheath, the sheath generates rolling similar to a tank crawler type under the action of friction force; therefore, the problem of abrasion caused by contact between the cable and a pipe wall or a construction site is solved, the friction force is reduced, the construction difficulty is reduced, the cost is low, and the popularization significance is achieved.

Description

Technical Field

[0001] This invention relates to the field of insulating sheath structure technology, and in particular to a flexible oil-storage type insulating sheath. Background Technology

[0002] With the rapid development of infrastructure such as urban power grids, rail transit, offshore wind power, and data centers, the length and number of circuits of high-voltage and ultra-high-voltage cable lines have increased explosively. To reduce transmission losses and improve power supply reliability, the "factory prefabrication and on-site laying" joint scheme is commonly adopted in engineering. This method involves assembling, vulcanizing, and conducting electrical tests on key components such as stress cones, epoxy sleeves, and rubber bodies with the cables at both ends in a cleanroom. Then, the entire "joint section" is coiled on a special cable laying frame and dragged to the site along tunnels, ducts, or J-shaped pipes using a traction machine, conveyor, and pulley system. However, existing cables experience wear and tear during the laying and dragging process due to contact with pipe walls or construction sites, resulting in excessive friction that affects service life and increases construction difficulty.

[0003] Oil-filled insulating sheaths are movable insulating sheaths filled with lubricating oil. The inner and outer layers are filled with lubricating oil, allowing them to move like tank tracks on cables. They are typically used to protect cable joints. Currently, there are no similar products to oil-filled insulating sheaths, indicating room for improvement. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings by providing a flexible oil-retaining insulating sheath.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a flexible oil-retaining insulating sheath, comprising: A rubber tube, wherein the rubber tube is provided with a thick tube end and a thin tube end; The thick end and the thin end of the rubber tube are turned outwards and overlapped, and the overlapping part is glued together. The two ends of the rubber tube are turned outwards to form an accommodating space. The accommodating space is filled with lubricating fluid.

[0006] The present invention adopts another technical solution: a method for preparing a flexible oil-retaining insulating sheath, comprising the following steps: S1. An auxiliary rod is inserted into the rubber tube to support the rubber tube, and the end of the thin tube is turned outward to form the first folded part a1. S2. Reverse the direction of the auxiliary rod and the rubber tube, and fold the end of the thick tube outward to form the second folded part a2, until the step line on the end of the thick tube coincides with the first folded part a1. S3. Fold the thicker end of the overlapping part outward to the side away from the thinner end to form the third fold a3 until the first fold a1 of the thinner end is exposed. S4. Use a pry bar to insert into the exposed first folded part a1 and pry up the first folded part a1 to make a gap between it and the original pipe wall; S5. Use a sharp needle to insert obliquely into the gap of the raised part of the thin tube to form a puncture, and then remove the sharp needle and replace it with a flat-headed needle to insert into the accommodating space from the puncture. S6. Remove the pry bar and sand the inner wall of the third folding part a3 and the outer wall of the first folding part a1, and apply adhesive. S7. Push the third fold a3 after applying the adhesive back to the flat-head needle tip, and tie the overlapping part of the adhesive applied to the thick tube end and the thin tube end. S8. After the adhesive in the overlapping part of the thick tube end and the thin tube end in step S7 has solidified, inject lubricant into the accommodating space through a flat-headed needle. S9. After pulling out the flat-head needle and wiping away the oil stains, polish the remaining outward-curved inner wall of the coarse tube end and the outer wall of the thin tube end from step S6, apply adhesive, and push the coarse tube end until it completely covers the thin tube end.

[0007] Furthermore, steps S1 and S2 also include a fixing clamp for holding one end of the auxiliary rod so that the rubber tube can be turned outward.

[0008] Furthermore, before the auxiliary rod is inserted into the rubber tube, steps S1 and S2 include a step of applying talcum powder to the surface of the auxiliary rod and wiping off any leaked talcum powder after the end of the rubber tube is folded over.

[0009] Furthermore, before the thin and thick tube ends are turned outward in steps S1 and S2, a step is also included in which lubricant is applied to the rubber tube at a distance of 1.5-8 cm from the end.

[0010] Furthermore, in step S2, during the outward folding of the thick tube end, a step is also included: holding the already folded portion of the rubber tube and stroking it towards the end near the first folding part a1.

[0011] Furthermore, step S3 also includes a sliding cylinder; The sliding sleeve is fitted on the outer surface of the rubber tube and contacts the outwardly folded third fold a3. The inner surface of the third fold a3 and the outer surface of the sliding sleeve are coated with talcum powder. In steps S7 and S9, after applying adhesive to the third folding part a3, the slide cylinder is pushed to reset the third folding part a3 and bond it to the first folding part a1.

[0012] Furthermore, in step S9, after the thick pipe end has completely covered the thin pipe end, adhesive needs to be applied multiple times at the bonding area to form a smooth slope.

[0013] The beneficial effects of this invention are reflected in: This invention allows for the application of the insulating sheath proposed in this application to be fitted onto the outer surface of the cable during cable laying. As the cable is dragged and moves, the cable comes into contact with the inner surface of the insulating sheath, and under the action of friction, the sheath rolls in a manner similar to tank tracks. This reduces the wear caused by the cable coming into contact with the pipe wall or construction site, reduces friction, lowers construction difficulty, and is inexpensive, making it worthy of widespread application. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the structure of the present invention; Figure 2 This is a schematic diagram of the rubber tube structure of the present invention; Figure 3 This is a schematic diagram of the product in step S1 of the present invention; Figure 4 This is a cross-sectional view of the product in step S1 of the present invention; Figure 5 This is a schematic diagram of the product in step S2 of the present invention; Figure 6 This is a cross-sectional view of the product from step S2 of the present invention; Figure 7 This is a schematic diagram of the product in step S5 of the present invention; Figure 8 This is a cross-sectional view of the product from step S5 of the present invention; Figure 9 This is a schematic diagram of the product in step S8 of the present invention; Figure 10 This is a cross-sectional view of the product in step S8 of the present invention.

[0015] In the picture: 01. Auxiliary rod; 02. Pry bar; 03. Pointed needle; 04. Flat-headed needle; 05. Cable; 1. Rubber hose; 11. Thick tube end; 111. Step line; 12. Thin tube end; a1, First fold; a2, Second fold; a3, Third fold. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figure 1This invention discloses a flexible oil-retaining insulating sheath, comprising: Rubber tube 1, wherein a thick tube end 11 and a thin tube end 12 are provided on the rubber tube 1; The thick end 11 and the thin end 12 of the rubber tube 1 are turned outward and overlap each other, and the overlapping part is glued together. The two ends of the rubber tube 1 are turned outward to form an accommodating space. The accommodating space is filled with lubricating fluid; As shown in the figure, the inner diameter of the thick tube end 11 is adapted to the thin tube end 12, and it has a step line 111. The above design is to allow the thick tube end 11 to be folded over and then fitted onto the outer surface of the folded thin tube end 12, reducing the difficulty of fitting. In another preferred embodiment, a groove may be provided on the inner wall of the thin tube end 12, the inner diameter of which is greater than or less than the inner diameter of the rubber tube 1, while the outer surface of the thick tube end 11 does not have a step line 111, but a corresponding groove corresponding to the groove on the thin tube end 12 is provided on the outer surface of the corresponding thick tube end 11, so that there is no obvious protrusion on the surface during the folding and overlapping process, and the overall product is smoother.

[0018] It should be noted that in the flexible oil-storage insulating sheath proposed in this application, the overlapping adhesive area is an adhesive layer, wherein the two ends of the rubber tube 1 are folded and bonded to form an annular bladder, and the annular bladder is filled with lubricating fluid, specifically, the lubricating fluid can be hydraulic oil. When used, this application can be applied to the laying process of cable 05. Specifically, when laying cable 05, the insulating sheath proposed in this application can be fitted onto the outer surface of cable 05. During the process of cable 05 being dragged and moving, after cable 05 comes into contact with the inner surface of the insulating sheath, the sheath rolls like a tank track under the action of friction, thereby reducing the wear caused by cable 05 contacting the pipe wall or construction site, reducing friction, reducing construction difficulty, and having low cost, which is of great significance for promotion.

[0019] Please see Figure 2-10 The above-mentioned method for preparing a flexible oil-retaining insulating sheath includes the following steps: S1. An auxiliary rod 01 is inserted into the rubber tube 1 to support the rubber tube 1, and the thin tube end 12 is turned outward to form the first folded part a1. S2. Reverse the direction of the auxiliary rod 01 and the rubber tube 1, and fold the thick tube end 11 outward to form the second folded part a2, until the step line 111 on the thick tube end 11 coincides with the first folded part a1. S3. Fold the coarse tube end 11 of the overlapping part outward to the side away from the thin tube end 12 to form the third folded part a3 until the first folded part a1 of the thin tube end 12 is exposed. S4. Use the pry bar 02 to insert into the exposed first folding part a1, and pry up the first folding part a1 to make it have a gap with the original pipe wall; S5. Use a sharp needle 03 to obliquely insert into the gap of the raised part of the thin tube end 12 to form a puncture, and pull out the sharp needle 03 and replace it with a flat needle 04 to insert into the accommodating space from the puncture. S6. Remove the pry bar 02 and polish the inner wall of the third folding part a3 and the outer wall of the first folding part a1 and apply adhesive. S7. Push the third fold a3 after applying the adhesive back to the flat-head needle 04, and tie the overlapping part of the thick tube end 11 and the thin tube end 12 coated with adhesive. S8. After the adhesive in the overlapping part of the coarse tube end 11 and the fine tube end 12 in step S7 has solidified, inject lubricant into the accommodating space through the flat-head needle 04. S9. After removing the flat-head needle 04 and wiping away the oil stains, polish the remaining outward-curved inner wall of the coarse tube end 11 and the outer wall of the thin tube end 12 from step S6, apply adhesive, and push the coarse tube end 11 until it completely covers the thin tube end 12.

[0020] Preferably, steps S1 and S2 further include a fixing clamp for clamping one end of the auxiliary rod 01 so that the rubber tube 1 can be turned outward. The auxiliary rod 01 can be an acrylic rod with an inner diameter that matches the rubber tube 1. Its surface is smooth and easy to insert the rubber tube 1. The fixing clamp is used to fix one end of the auxiliary rod 01 so that the other end of the rubber tube 1 can be folded.

[0021] In a preferred embodiment of this application, before the auxiliary rod 01 is inserted into the rubber tube 1, steps S1 and S2 further include a step of coating the surface of the auxiliary rod 01 with talcum powder and wiping off any leaked talcum powder after the end of the rubber tube 1 is folded over. In this application, coating with talcum powder is to facilitate the subsequent removal of the auxiliary rod 01 from the center of the rubber tube 1.

[0022] It should also be noted that, in steps S1 and S2, before the thin tube end 12 and the thick tube end 11 are turned outward, there is a step of applying lubricant at a distance of 1.5-8cm from the end of the rubber tube 1. In this application, the application of lubricant is to reduce the friction between the inner and outer walls of the rubber tube 1 at the folding point after the rubber tube 1 is turned outward, so as to make it turn out in one go.

[0023] Furthermore, in step S2, during the outward folding of the thick tube end 11, there is also a step of holding the outward-folded part of the rubber tube 1 and stroking it towards the end close to the first folding part a1. This step is to further push the rubber tube 1 into folding position after the folding process.

[0024] It is easy to imagine that step S3 also includes a slide, which is an auxiliary tool; The sliding sleeve is fitted on the outer surface of the rubber tube 1 and contacts the outwardly folded third fold a3. The inner surface of the third fold a3 and the outer surface of the sliding sleeve are coated with talcum powder. In steps S7 and S9, after applying adhesive to the third folding part a3, the slide is pushed to reset the third folding part a3 and bond it to the first folding part a1. The slide is provided to avoid the problem that it is difficult for the user to push the third folding part a3 to reset after applying adhesive to the outer surface of the third folding part a3.

[0025] Finally, it should be added that in step S9, after the thicker end 11 completely covers the thinner end 12, multiple applications of adhesive are needed at the bonding area to form a smooth slope. After each application, the adhesive should be left to thicken for 20 minutes before applying more, filling the step at the bonding area into a slope. This process requires multiple applications of adhesive, as each application will shrink after drying, exposing the step surface again. Therefore, multiple applications are necessary to ensure a smooth surface. Furthermore, after step S9 is completed, protective paper and clamps are used for fixation, and the protective paper and clamps are removed after standing still for 12 hours.

[0026] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] Additionally, "multiple" refers to two or more.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A flexible oil-storage insulating sheath, characterized in that, include: A rubber tube (1) is provided with a thick tube end (11) and a thin tube end (12). The thick end (11) and the thin end (12) of the rubber tube (1) are turned outward and overlapped, and the overlapping part is bonded together. The two ends of the rubber tube (1) are turned outward to form an accommodating space. The accommodating space is filled with lubricating fluid.

2. The method for preparing a flexible oil-storing insulating sheath according to claim 1, characterized in that, Includes the following steps: S1. An auxiliary rod (01) is inserted into the rubber tube (1) to support the rubber tube (1), and the thin tube end (12) is turned outward to form the first folded part (a1). S2. Reverse the direction of the auxiliary rod (01) and the rubber tube (1), and turn the thick tube end (11) outward to form the second folded part (a2) until the step line (111) on the thick tube end (11) coincides with the first folded part (a1); S3. Fold the coarse tube end (11) of the overlapping part outward to the side away from the thin tube end (12) to form the third fold (a3) ​​until the first fold (a1) of the thin tube end (12) is exposed. S4. Use a pry bar (02) to insert into the exposed first folded part (a1) and pry up the first folded part (a1) to make it have a gap with the original pipe wall; S5. Use a sharp needle (03) to obliquely insert into the gap of the raised part of the thin tube end (12) to form a puncture, and pull out the sharp needle (03) and replace it with a flat needle (04) to insert into the accommodating space from the puncture. S6. Remove the pry bar (02) and grind the inner wall of the third fold (a3) ​​and the outer wall of the first fold (a1) and apply adhesive. S7. Push the third fold (a3) ​​after applying the adhesive back to the flat-head needle (04) and tie the overlapping part of the thick tube end (11) and the thin tube end (12) coated with adhesive. S8. After the adhesive in the overlapping part of the coarse tube end (11) and the thin tube end (12) in step S7 has solidified, inject lubricant into the accommodating space through the flat-head needle (04). S9. After pulling out the flat-head needle (04) and wiping away the oil stains, polish the inner wall of the remaining outward-curved coarse tube end (11) and the outer wall of the thin tube end (12) from step S6 and apply adhesive, and push the coarse tube end (11) until it completely covers the thin tube end (12).

3. The method for preparing a flexible oil-storing insulating sheath according to claim 2, characterized in that: Steps S1 and S2 also include a fixing clamp for holding one end of the auxiliary rod (01) so that the rubber tube (1) can be turned outward.

4. The method for preparing a flexible oil-storing insulating sheath according to claim 2, characterized in that: Before the auxiliary rod (01) is inserted into the rubber tube (1) in steps S1 and S2, there is an additional step of applying talcum powder to the surface of the auxiliary rod (01) and wiping off any leaked talcum powder after the end of the rubber tube (1) is folded over.

5. The method for preparing a flexible oil-storing insulating sheath according to claim 2, characterized in that: Before the thin tube end (12) and the thick tube end (11) are turned outward in steps S1 and S2, a step is also included: applying lubricant to the rubber tube (1) at a distance of 1.5-8cm from the end.

6. The method for preparing a flexible oil-storing insulating sheath according to claim 5, characterized in that: In step S2, when the thick tube end (11) is turned outward, a step is also included: holding the part of the rubber tube (1) that has been turned outward and stroking it towards the end near the first fold (a1).

7. The method for preparing a flexible oil-storing insulating sheath according to claim 1, characterized in that: Step S3 also includes a sliding cylinder; The sliding sleeve is fitted on the outer surface of the rubber tube (1) and contacts the outwardly folded third fold (a3). The inner surface of the third fold (a3) ​​and the outer surface of the sliding sleeve are coated with talcum powder. In steps S7 and S9, after applying adhesive to the third folded part (a3), the slide is pushed to reset the third folded part (a3) ​​and bond it to the first folded part (a1).

8. The method for preparing a flexible oil-storing insulating sheath according to claim 1, characterized in that: In step S9, after the thick pipe end (11) is completely covered by the thin pipe end (12), adhesive needs to be applied multiple times at the bonding point to form a smooth slope.

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