Waterproof joint for large-length light underwater cable

Abstract

The utility model discloses a waterproof joint for a large-length light underwater cable, which comprises a waterproof protection box and a cold contraction type intermediate joint arranged in the waterproof protection box, and waterproof glue is filled between the cold contraction type intermediate joint and the waterproof protection box. The cold shrinkage type intermediate joint comprises a conductor connecting pipe, a metal shielding cover, a cold shrinkage type intermediate joint main body, an intermediate joint outer shielding layer, an intermediate joint waterproof layer and an outer armored belt layer which are sequentially arranged from inside to outside. According to the utility model, conductor connection of two sections of cables is realized through the conductor connecting pipe, stripped conductor insulation is recovered through the cold contraction type intermediate joint main body, and the intermediate joint outer shielding layer, the intermediate joint waterproof layer and the outer armor belt layer are sequentially lapped in the process of recovering each layer of the cable, so that connection of the cables at two ends is completed, and the length of the cable is increased; and the waterproof protection box poured with waterproof glue is used for carrying out sealing protection on the cold shrinkage type intermediate joint at the joint of the two sections of cables, so that excellent waterproof performance is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of cable joints, in particular to a waterproof joint for a large-length light underwater cable. Background Art

[0002] With the continuous development and utilization of shallow sea and nearshore wind power and solar photovoltaic power, the demand for cable grid connection in shallow sea areas will inevitably increase. For these areas, the terrain is mainly shallow sea and intertidal zone, and the distance from the shore is relatively close. The farthest distance is about 3-5 km, and the nearest distance is only dozens to hundreds of meters. The water depth generally does not exceed 50 meters. For this specific water environment, the use of light underwater cables can reduce costs and weight. At the same time, the light underwater cable realizes the replacement of large cargo ship transportation of submarine cables with land transportation methods, greatly reducing the cable manufacturing, transportation and construction costs. However, limited by land transportation conditions, the maximum production length of a single light underwater cable product developed previously is only 1-2 km, which cannot meet the requirements of a 3-5 km underwater laying path length. Therefore, the market urgently needs a joint for large-length light underwater cables to solve the above problems. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a waterproof joint for a large-length light underwater cable, which connects two cables with delivery lengths, increases the cable length, meets the requirement of a large length of the operating line and has excellent waterproof performance.

[0004] The technical solution to achieve the purpose of the utility model is:

[0005] A waterproof joint for a large-length light underwater cable includes a waterproof protection box and a cold-shrinkable intermediate joint arranged in the waterproof protection box. Waterproof glue is filled between the cold-shrinkable intermediate joint and the waterproof protection box. The cold-shrinkable intermediate joint includes a conductor connection pipe, a metal shielding cover, a cold-shrinkable intermediate joint body, an outer shielding layer of the intermediate joint, a waterproof layer of the intermediate joint, and an outer armor belt layer arranged in sequence from inside to outside. The conductor connection pipe is used to connect the conductors of two sections of cables, and the cold-shrinkable intermediate joint body is used to connect the insulations of two sections of cables.

[0006] Further, sealing rings are connected between the two ends of the waterproof protection box and the cable outer sheath, and sealing glue is filled between the slopes and gaps to form a smooth and ellipsoidal conical sealing end. A waterproof self-adhesive tape is wrapped around the sealing end.

[0007] Further, a heat-shrinkable waterproof sleeve is sleeved outside the waterproof self-adhesive tape.

[0008] Further, the waterproof glue is an acrylic AB glue prepared by stirring acrylic A glue and acrylic B glue in a ratio of 1:1.

[0009] Further, a feed inlet and a pressure relief hole communicating with the inner cavity are provided at the top of the waterproof protection box.

[0010] Further, the conductor connecting pipe is made of a metal material having the same material as the conductor, and the metal shielding cover is an upper and lower structure that is mutually pressed, and the outer diameter after pressing is the same as the conductor insulation layer of the cable.

[0011] Further, an insulating mixture applied to the main insulation is filled in the steps at the cut-off ends of the semiconductive layers of the two sections of the cable at both ends of the metal shielding cover.

[0012] Further, the outer shielding layer of the intermediate joint includes a metal braided mesh sleeve, a PVC tape layer, and small constant force springs and straps for fixing the metal braided mesh sleeve to the cable metal shielding layer and the cold shrinkable intermediate joint body respectively. The PVC tape layer is a double-layer semi-overlapping PVC tape wound around the cold shrinkable intermediate joint body, and both ends extend to the outside of the small constant force springs to completely cover the metal braided mesh sleeve.

[0013] Further, the waterproof layer of the intermediate joint includes a first waterproof tape layer and a second waterproof tape layer. The first waterproof tape layer is a PVC waterproof tape that is semi-overlappingly wound from the upper half of the inner sheath of one end of the cable to the inner sheath of the other end and then folded back. The second waterproof tape layer is a PVC waterproof tape that is semi-overlappingly wound from the upper half of the outer sheath of one end of the cable to the outer sheath of the other end and then folded back.

[0014] Adopting the above technical solutions, the utility model has the following beneficial effects:

[0015] (1) The utility model realizes the connection of the conductors of the two sections of the cable through the conductor connecting pipe, restores the peeled conductor insulation through the cold shrinkable intermediate joint body, and successively wraps the outer shielding layer of the intermediate joint, the waterproof layer of the intermediate joint, and the outer armor tape layer during the process of restoring each layer of the cable to complete the connection of the two sections of the cable, increase the cable length, meet the demand for a large length of the operating line, and finally seals and protects the cold shrinkable intermediate joint at the connection of the two sections of the cable through the waterproof protection box filled with waterproof glue inside to achieve excellent waterproof performance.

[0016] (2) The utility model adds sealing rings and sealant at both ends of the waterproof protection box, and wraps a layer of waterproof self-adhesive tape to avoid water leakage at the ports caused by long-term use and improve the waterproof performance.

[0017] (3) The utility model adds a heat shrinkable waterproof sleeve outside the waterproof self-adhesive tape to effectively protect the waterproof self-adhesive tape and further improve the waterproof sealing performance.

[0018] (4) The waterproof protection box of the present utility model is provided with a pressure relief hole, so that when pouring glue, the air in the waterproof protection box can quickly discharge from the pressure relief hole, avoiding the situation in the traditional structure where the pressure relief and glue pouring share the same hole, resulting in local air pockets and affecting the waterproof effect.

[0019] (5) The conductor connecting pipe of the present utility model is made of the same metal material as the conductor, and the conductor can be fixed by pressing. The structure is simple, ensuring the conductivity after connection. The outer diameter of the metal shielding cover is designed to be the same as the insulating outer diameter of the conductor after pressing, so that it is flush with the conductor insulation after butt joint, avoiding damage to the outer cold shrinkable intermediate joint body due to steps.

[0020] (6) The present utility model is additionally provided with an insulating mixture coated on the conductor insulation to further ensure the insulation of the cable conductor.

[0021] (7) The outer shielding layer of the intermediate joint of the present utility model adopts a metal braided mesh sleeve and a PVC tape layer. The structure is simple, and the metal braided mesh sleeve is fixed by a small constant force spring and a binding band, which is convenient for installation.

[0022] (8) The waterproof layer of the intermediate joint of the present utility model adopts a waterproof tape layer, which has a low cost, and is wound in a folded-back and half-overlapping manner to achieve a double-layer winding effect and improve the waterproof performance. Description of the Drawings

[0023] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments in combination with the drawings, where:

[0024] Figure 1 is a schematic diagram of the overall structure of the waterproof joint of the present utility model;

[0025] Figure 2 is a schematic diagram of the crimped conductor connecting pipe of the present utility model.

[0026] Figure 3 is a schematic diagram of the structure for restoring the cable metal shielding layer of the present utility model.

[0027] Figure 4 is a schematic diagram of restoring the inner sheath and outer sheath of the present utility model.

[0028] The reference numerals in the drawings are:

[0029] Waterproof protection box 1, feed inlet 1-1, pressure relief hole 1-2, waterproof glue 2, conductor connecting pipe 3, metal shielding cover 4, cold shrinkable intermediate joint body 5, intermediate joint outer shielding layer 6, metal braided mesh sleeve 6-1, PVC tape layer 6-2, small constant force spring 6-3, binding band 6-4, intermediate joint waterproof layer 7, first waterproof tape layer 7-1, second waterproof tape layer 7-2, outer armor belt layer 8, sealing ring 9, sealant 10, heat shrinkable waterproof sleeve 11. Detailed implementation mode

[0030] To better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation modes.

[0031] (Example 1)

[0032] As Figure 1 shown in the waterproof joint for large-length light-duty underwater cables, it includes a waterproof protection box 1 and a cold-shrinkable intermediate joint arranged in the waterproof protection box 1. A waterproof adhesive 2 is filled between the cold-shrinkable intermediate joint and the waterproof protection box 1 to seal and protect the internal cold-shrinkable intermediate joint, achieving excellent waterproof performance. The cold-shrinkable intermediate joint includes a conductor connection pipe 3, a metal shielding cover 4, a cold-shrinkable intermediate joint body 5, an intermediate joint outer shielding layer 6, an intermediate joint waterproof layer 7, and an outer armor tape layer 8 arranged in sequence from the inside to the outside. The conductors of two sections of cables are connected through the conductor connection pipe 3, and the stripped conductor insulation is connected through the cold-shrinkable intermediate joint body 5. The conductor shielding layer is connected through the intermediate joint outer shielding layer 6. Subsequently, the intermediate joint waterproof layer 7 and the outer armor tape layer 8 restore the cable outer sheath and the outer mechanical protection in sequence to complete the connection of the two ends of the cable, increase the cable length, and meet the requirements of the large length of the operating line.

[0033] Specifically, the conductors of two sections of cables are fixedly connected by crimping the conductor connection pipe 3, and the structure is simple. The conductor connection pipe 3 is made of a metal material with the same material as the conductor to ensure the conductivity after connection. The metal shielding cover 4 is sleeved outside the conductor connection pipe 3 and adopts an upper and lower structure that is mutually pressed, and the outer diameter after pressing is the same as the conductor insulation layer of the cable, so that it is flush with the conductor insulation after docking, avoiding the appearance of steps and damaging the outer cold-shrinkable intermediate joint body 5.

[0034] The steps at the cut-off of the semi-conductive layers at both ends of the metal shielding cover 4 and the two sections of cables are filled with an insulation mixture applied on the main insulation to further ensure the insulation of the cable conductor, and the cold-shrinkable intermediate joint body 5 covers it.

[0035] The intermediate joint outer shielding layer 6 includes a metal braided mesh sleeve 6-1, a PVC tape layer 6-2, a small constant force spring 6-3, and a binding tape 6-4. The metal braided mesh sleeve 6-1 is sleeved outside the cold-shrinkable intermediate joint body 5, and both ends extend to the two sections of cables. The metal braided mesh sleeve 6-1 is fixed on the cable metal shielding layer and the cold-shrinkable intermediate joint body 5 respectively through the small constant force spring 6-3 and the binding tape 6-4. The binding tape 6-4 is a PVC tape, which is convenient for operation. The PVC tape layer 6-2 is a double-layer semi-overlapping PVC tape wrapped around the cold-shrinkable intermediate joint body, and both ends extend to the outside of the small constant force spring 6-3 to completely cover the metal braided mesh sleeve 6-1.

[0036] The intermediate joint waterproof layer 7 includes a first waterproof tape layer 7-1 and a second waterproof tape layer 7-2. The first waterproof tape layer 7-1 is a PVC waterproof tape that overlaps and wraps around the upper half of the inner sheath of one end of the cable to the inner sheath of the other end and then turns back. The second waterproof tape layer 7-2 is a PVC waterproof tape that overlaps and wraps around the upper half of the outer sheath of one end of the cable to the outer sheath of the other end and then turns back. It has a low cost and adopts an overlapping and turning-back wrapping method to achieve the double-layer wrapping effect of the waterproof tape layer and the four-layer wrapping effect of the intermediate joint waterproof layer, improving the waterproof performance.

[0037] The outer armor tape layer 8 is wrapped outside the intermediate joint waterproof layer 7 to form a cold-shrinkable intermediate joint. The waterproof protection box 1 is hermetically sleeved outside the cold-shrinkable intermediate joint. To prevent water leakage at both ends, in this embodiment, sealing rings 9 are connected between both ends of the waterproof protection box 1 and the cable outer sheath, and sealant 10 is filled between the slopes and gaps to form a smooth and elliptical conical sealing end. A waterproof self-adhesive tape is wrapped outside the sealing end, and a heat-shrinkable waterproof sleeve 11 is sleeved outside the waterproof self-adhesive tape to further improve the waterproof sealing performance.

[0038] The waterproof glue is acrylic AB glue stirred by acrylic A glue and acrylic B glue in a ratio of 1:1. To facilitate the smooth discharge of air inside the waterproof protection box 1, in this embodiment, a feed port 1-1 and a pressure relief hole 1-2 communicating with the inner cavity are provided at the top of the waterproof protection box 1. The AB glue is poured through the feed port 1-1, and air is exhausted through the pressure relief hole 1-2, avoiding the situation in the traditional structure where the pressure relief and glue filling share the same hole, resulting in local empty cans and affecting the waterproof effect.

[0039] The installation process of the waterproof joint in this embodiment is as follows:

[0040] Cable pretreatment: Straighten the cable before installation. Cut 1000mm from each of the two sections of the cable, and strip the outer sheath and inner sheath. Fit the sealing rings 9 and heat-shrinkable waterproof sleeves 11 on both ends of the cable at 1000mm. Open and strip the cable. When cutting the outer semi-conductive shielding layer of the cable, be careful not to scratch the conductor insulation.

[0041] Install the cold-shrinkable intermediate joint 4: As Figure 2 shown, insert the cold-shrinkable intermediate joint body 5 into the cable from the end with a longer stripping length, and fit the shorter end with the metal braided mesh sleeve 6-1. Install the conductor connection pipe 3, then symmetrically crimp it, file it flat and smooth it, and clean it. Closely fasten the metal shielding cover 4 with an upper and lower structure on the surface of the conductor connection pipe 3, and the outer surface is flush with the conductor insulation. Fill the step at the cut-off of the cable semi-conductive layer with insulating mixture, and then evenly apply all the remaining mixture on the surface of the main insulation without leaving any residue. Note that the surface of the metal shielding cover 4 does not need to be coated with insulating mixture. Pull the joint of the cold-shrinkable intermediate joint body 5 to achieve cold-shrink installation outside the metal shielding cover 4 and the conductor insulation.

[0042] Install the outer shield layer 6 of the intermediate joint: As Figures 3 to 4 shown, unfold the metal braided sleeve 6-1 outside the installed cold-shrinkable intermediate joint body 5. Use PVC tape as the binding band 6-4 to tie the metal braided sleeve 6-1 to the cold-shrinkable intermediate joint body 5. Fix both ends of the metal braided sleeve 6-1 to the copper shielding tape of the cable with two small constant force springs 6-3.

[0043] Trim the two ends of the metal braided sleeve 6-1 neatly, or fold them back into the small constant force springs. Wrap two layers of PVC tape in a half-overlapping manner to completely cover the constant force springs and the rough edges of the copper shielding net. For multi-phase cables, complete the connection of other phases in the same way.

[0044] Install the waterproof layer 7 of the intermediate joint: Restore the inner sheath of the cable: Then start from one end of the inner sheath and wrap the waterproof tape in a half-overlapping manner to the other end of the sheath for one round trip, with the adhesive side facing inwards, to form the first waterproof tape layer 7-1. Install the armored grounding connecting wire, restore the outer sheath of the cable, and then start from one end of the outer sheath and wrap the waterproof tape in a half-overlapping manner to the other end of the outer sheath for one round trip, with the adhesive side facing inwards, to form the second waterproof tape layer 7-2. When wrapping the waterproof tape, it is necessary to ensure that the tape is pulled to 3 / 4 of its original width and wrapped in a half-overlapping manner. After completion, squeeze the tape firmly with both hands to make it closely attached.

[0045] Install the outer armored tape layer 8: After opening the package of the armored tape, soak it completely in water for more than 30 seconds first, and then start from the intermediate joint waterproof layer 7 outside the outer sheath of one end of the cable and wrap the armored tape in a half-overlapping manner to the intermediate joint waterproof layer 7 of the other end of the cable to complete the installation of the cold-shrinkable intermediate joint.

[0046] Install the waterproof protection box 11: Place the cold-shrinkable intermediate joint in the waterproof protection box 11, move the sealing ring 9 to the port of the waterproof protection box 11, and lock the waterproof protection box 11 with bolts. Fill the slope and gap between the outer sheath of the cable and the waterproof protection box 11 with the sealant 10, and then use the waterproof self-adhesive tape to lap and wrap the waterproof protection box 11 evenly into an elliptical cone shape, and slip on the heat-shrinkable waterproof sleeve 11 to achieve excellent sealing performance. Finally, open the feed port 1-1 and the pressure relief hole 1-2 of the waterproof protection box 11. Stir the AB pouring waterproof glue in a 1:1 ratio, observe the color during stirring until the green color disappears, and pour it from the feed port 1-1 until it is full.

[0047] The utility model realizes the conductor connection of two sections of cables through a conductor connection pipe, restores the stripped conductor insulation through a cold-shrinkable intermediate joint body, and sequentially wraps an outer shielding layer, a waterproof layer and an outer armor tape layer of the intermediate joint during the process of restoring each layer of the cable to complete the connection of the two ends of the cable, increase the cable length, meet the requirement of the large length of the operating line, and finally seal and protect the cold-shrinkable intermediate joint at the connection of the two sections of cables through a waterproof protection box filled with waterproof glue inside to achieve excellent waterproof performance.

[0048] In the above specific embodiments, the purpose, technical solution and beneficial effects of the utility model are further described in detail. It should be understood that the above are only specific embodiments of the utility model and are not used to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A waterproof joint for a large-length and light-type underwater cable, characterized in that: It includes a waterproof protection box and a cold-shrinkable intermediate joint arranged inside the waterproof protection box. Waterproof glue is filled between the cold-shrinkable intermediate joint and the waterproof protection box. The cold-shrinkable intermediate joint includes a conductor connection pipe, a metal shielding cover, a cold-shrinkable intermediate joint body, an intermediate joint outer shielding layer, an intermediate joint waterproof layer, and an outer armor tape layer, which are arranged in sequence from inside to outside. The conductor connection pipe is used to connect the conductors of two sections of cables, and the cold-shrinkable intermediate joint body is used to connect the insulations of two sections of cables.

2. The waterproof joint for a long-length and light-type underwater cable according to claim 1, characterized in that: Sealing rings are connected between the two ends of the waterproof protection box and the cable outer sheath, and sealing glue is filled between the slope and the gap to form a smooth and ellipsoidal conical sealing end. The waterproof self-adhesive tape is wrapped around the outside of the sealing end.

3. The waterproof joint for a large-length and light-type underwater cable according to claim 2, wherein: A heat-shrinkable waterproof sleeve is sleeved outside the waterproof self-adhesive tape.

4. A waterproof joint for a large-length light underwater cable according to claim 1, characterized in that: The waterproof glue is acrylic AB glue.

5. A waterproof joint for a large-length and light-type underwater cable according to claim 1, characterized in that: The top of the waterproof protection box is provided with a feed port and a pressure relief hole communicating with the inner cavity.

6. The waterproof joint for a large-length and light-type underwater cable according to claim 1, characterized in that: The conductor connection pipe is made of a metal material with the same material as the conductor. The metal shielding cover is a vertically and horizontally pressed structure, and the outer diameter after pressing is the same as that of the conductor insulation layer of the cable.

7. A waterproof joint for a large-length light underwater cable according to claim 1, characterized in that: Insulating mixture smeared on the main insulation is filled in the steps at the cut-off ends of the semi-conductive layers of the two sections of cables at both ends of the metal shielding cover.

8. The waterproof joint for a large-length and light-type underwater cable according to claim 1, wherein: The intermediate joint outer shielding layer includes a metal braided mesh sleeve, a PVC tape layer, small constant force springs and straps for respectively fixing the metal braided mesh sleeve on the cable metal shielding layer and the cold-shrinkable intermediate joint body. The PVC tape layer is a double-layer PVC tape wrapped around the cold-shrinkable intermediate joint body in a semi-overlapping manner, and both ends extend to the outside of the small constant force springs to completely cover the metal braided mesh sleeve.

9. The waterproof joint for a large-length and light undersea cable according to claim 1, characterized in that: The intermediate joint waterproof layer includes a first waterproof tape layer and a second waterproof tape layer. The first waterproof tape layer is a PVC waterproof tape wrapped around the upper half of one end of the cable inner sheath to the upper half of the other end of the cable inner sheath and then folded back. The second waterproof tape layer is a PVC waterproof tape wrapped around the upper half of one end of the cable outer sheath to the upper half of the other end of the cable outer sheath and then folded back.

Images