A waterproof intermediate joint

Abstract

This utility model discloses a waterproof intermediate joint, relating to the field of cable joint technology, comprising: a connecting structure disposed on the outside of the cable core; a first waterproof layer disposed on the outer periphery of the connecting structure and the core insulation layer; a joint body disposed on the outer periphery of the first waterproof layer; an end sealing structure disposed at both ends of the joint body; and a second waterproof layer disposed between the joint body and the end sealing structure. This utility model provides an interface compatibilizer between the joint body and the core insulation layer, and provides an interface compatibilizer or primer at the ends of the joint body, which effectively improves the connection strength between the joint body and adjacent structures. The interface compatibilizer or primer eliminates interface gaps, solving the waterproofing issues between the joint body and the internal core, as well as between the joint body and the outer ends, ensuring safe, stable, and reliable operation of the product under long-term water immersion conditions.

Description

Technical Field

[0001] This utility model relates to the field of cable joint technology, and in particular to a waterproof intermediate joint. Background Technology

[0002] Currently, most new energy power is distributed in deserts, tidal flats and other rainy and humid areas. The intermediate joints are submerged in water for a long time, and the operating environment is harsh. This places extremely high demands on the waterproof performance of the cable intermediate joints. The performance of conventional cable intermediate joints is increasingly unable to meet the requirements. Moisture and humidity are prone to enter the joint body and enter the insulation interface between the cable insulation surface and the joint body through the interface gap, reducing the interface insulation performance and causing surface creepage and ablation faults. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a waterproof intermediate joint that can solve the problem of insulation and waterproofing of the interface gap.

[0004] The waterproof intermediate joint according to an embodiment of the present invention includes:

[0005] A connection structure is disposed on the outside of the cable core and is in contact with the cable core insulation layer;

[0006] The first waterproof layer is disposed on the outer periphery of the connection structure and the core insulation layer, and covers the semiconductive layer of the cable along the length of the cable. The first waterproof layer is a coated interface compatibilizer.

[0007] The connector body is disposed on the outer periphery of the first waterproof layer;

[0008] An end sealing structure is provided at both ends of the connector body;

[0009] A second waterproof layer is disposed between the joint body and the end sealing structure, and the second waterproof layer includes a coated interface compatibilizer and / or primer.

[0010] The waterproof intermediate joint according to the present utility model embodiment has at least the following beneficial effects: The waterproof intermediate joint of this embodiment provides an interface compatibilizer between the joint body and the wire core insulation layer, and provides an interface compatibilizer or primer at the end of the joint body, which can effectively improve the connection strength between the joint body and the adjacent structure. By eliminating the interface gap through the interface compatibilizer or primer, it can solve the waterproofing between the joint body and the internal wire core and between the joint body and the two outer ends, and can ensure that the product can operate safely, stably and reliably in a long-term water immersion environment.

[0011] According to some embodiments of the present invention, the connection structure includes a connecting tube sleeved on the wire core, and a tapered step is provided on the side of the wire core insulation layer near the connecting tube.

[0012] According to some embodiments of the present invention, the connection structure further includes, from the inside out: waterproof sealant wrapped between the connecting tube and the conical step; a semi-conductive tape wrapped around the outer periphery of the connecting tube and connected to the wire core insulation layer; and an insulating self-adhesive tape wrapped around and covering the outside of the wire core insulation layer.

[0013] According to some embodiments of the present invention, the second waterproof layer includes an interface compatibilizer layer disposed between the connector body and the end sealing structure, and a primer layer disposed between the cable and the end sealing structure.

[0014] According to some embodiments of the present invention, the end sealing structure includes a sealant and a waterproof strip wrapping the sealant, the interface compatibilizer layer is at least disposed on the outer peripheral wall of the connector body in contact with the waterproof strip, and the primer layer is at least disposed on the outer peripheral wall of the cable contact sealant.

[0015] According to some embodiments of the present invention, the end sealing structure includes a heat-shrinkable semi-conductive tube, which covers both ends of the connector body.

[0016] According to some embodiments of the present invention, hot melt adhesive is provided at both ends of the heat-shrinkable semiconducting tube.

[0017] According to some embodiments of this utility model, the two ends of the heat-shrinkable semiconducting tube are wrapped with waterproof tape.

[0018] According to some embodiments of the present invention, the waterproof intermediate joint further includes a cold shrink finger sleeve, which is disposed at the three-phase bifurcation point of the cable. A first sealing ring is disposed between the cold shrink finger sleeve and the phase cable of the cable, and a second sealing ring is disposed between the cold shrink finger sleeve and the main cable of the cable.

[0019] According to some embodiments of the present invention, the waterproof intermediate joint further includes a third waterproof layer, which covers the outer sheath of the cable and is wrapped with waterproof tape and PVC tape from the inside to the outside.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a schematic diagram of an overall structure of the waterproof intermediate joint in this utility model;

[0023] Figure 2 This is a schematic diagram of the connection structure of the waterproof intermediate joint in this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the first and second waterproof layers of the waterproof intermediate joint in this utility model.

[0025] Figure 4 This is a schematic diagram of the end sealing structure of the waterproof intermediate joint in this utility model. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0030] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] Currently, most new energy power is distributed in deserts, tidal flats and other rainy and humid areas. The intermediate joints are submerged in water for a long time, and the operating environment is harsh. This places extremely high demands on the waterproof performance of the cable intermediate joints. The performance of conventional cable intermediate joints is increasingly unable to meet the requirements. Moisture and humidity are prone to enter the joint body and enter the insulation interface between the cable insulation surface and the joint body through the interface gap, reducing the interface insulation performance and causing surface creepage and ablation faults.

[0032] Therefore, embodiments of this utility model propose a waterproof intermediate joint to solve the waterproof insulation problem caused by interface gaps.

[0033] Reference Figures 1 to 4 The waterproof intermediate joint in this embodiment is provided with a connection structure 100, a first waterproof layer 400, a joint body 200, an end sealing structure 300, and a second waterproof layer 500.

[0034] The connecting structure 100 is disposed on the outside of the cores 1001 of the two connected cables, and is used to fix the cores 1001 of the two cables together. The two ends of the connecting structure 100 are connected to the insulation layers 1002 of the cores of the two cables, so that the cores 1001 are completely covered, and the outer peripheral surface of the connecting structure 100 is flush or nearly flush with the insulation layers 1002.

[0035] The first waterproof layer 400 covers the outer peripheral surface of the connection structure 100. Along the length of the cable, the first waterproof layer 400 covers the core insulation layer 1002 and extends to the semiconductive layer 1003. The first waterproof layer 400 is made by coating with an interface compatibilizer.

[0036] The connector body 200 is disposed on the outer periphery of the first waterproof layer 400, and the coating length of the connector body 200 matches that of the first waterproof layer 400 along the length of the cable.

[0037] The end sealing structure 300 is provided at both ends of the connector body 200 to seal both ends of the connector body 200.

[0038] The second waterproof layer 500 is disposed between the joint body 200 and the end sealing structure 300, and the second waterproof layer 500 includes a coated interface compatibilizer and / or primer.

[0039] Combination Figure 1 It is understandable that a cable, from the inside out, generally includes a conductor 1001, a conductor insulation layer 1002, a semi-conductive layer 1003, a conductor shielding layer 1004, an inner sheath, an armor layer, and an outer sheath 1005. When splicing cables, each layer needs to be peeled off to connect the conductors 1001 together. The intermediate joint is used to achieve this splicing. The connection structure 100 secures the two exposed conductors 1001 together, maintaining contact with the conductor insulation layer 1002 to ensure the conductors 1001 are completely covered. The joint body 200 then covers the semi-conductive layers 1003 of both cables, ensuring the connection strength and stability of the two conductors 1001.

[0040] Based on this, the waterproof intermediate joint of this embodiment provides an interface compatibilizer between the joint body 200 and the wire core insulation layer 1002, and provides an interface compatibilizer or primer at the end of the joint body 200. This can effectively improve the connection strength between the joint body 200 and adjacent structures. By eliminating interface gaps through the interface compatibilizer or primer, the waterproofing between the joint body 200 and the internal wire core 1001 and between the joint body 200 and the two outer ends can be solved, ensuring that the product can operate safely, stably and reliably in a long-term water immersion environment.

[0041] Reference Figure 2 In some embodiments of this utility model, the connecting structure 100 includes a connecting tube 101 sleeved on the wire core 1001, and a tapered step 10021 is provided on the side of the wire core insulation layer 1002 near the connecting tube 101. It is understood that the tapered step 10021 can be formed during the stripping of the wire core insulation layer 1002, and does not need to be separately provided. In this embodiment, by providing the tapered step 10021 on the wire core insulation layer 1002, the bonding area between the connecting structure 100 and the wire core insulation layer 1002 can be increased, which also helps to improve the bonding strength between the connecting structure 100 and the wire core insulation layer 1002, thereby helping to improve the sealing performance between the two and achieving a waterproof seal inside the connector body 200.

[0042] In actual production applications, the length of the tapered step 10021 along the length of the cable is set to 8mm to fully ensure the joint effect of the two.

[0043] In some embodiments of this utility model, the connecting structure 100 further includes, from the inside out: waterproof sealant wrapped between the connecting tube 101 and the tapered step 10021; a semi-conductive tape wrapped around the outer periphery of the connecting tube 101 and connected to the core insulation layer 1002; and an insulating self-adhesive tape wrapped around and covering the outer side of the core insulation layer 1002. In application, after the connecting tube 101 is crimped, waterproof sealant is wrapped around the position between the connecting tube 101 and the tapered step 10021 to fill the gap between them. During the wrapping process, the waterproof sealant naturally overlaps and covers the circumferential sidewalls of the connecting tube 101 and the tapered step 10021. Then, a semi-conductive tape is wrapped around the outer periphery of the connecting tube 101, the waterproof sealant, and the tapered step 10021. Finally, an insulating self-adhesive tape is wrapped, ensuring that the outer periphery of the insulating self-adhesive tape is flush with or nearly flush with the core insulation layer 1002. Furthermore, the insulating self-adhesive tape is overlapped onto the surface of the core insulation layer 1002, with an overlap length of 20mm along the length of the cable, in order to ensure the insulation and sealing of the connection structure 100.

[0044] In some embodiments of this invention, the second waterproof layer 500 includes an interface compatibilizer layer disposed between the connector body 200 and the end sealing structure 300, and a primer layer disposed between the cable and the end sealing structure 300. Since the end sealing structure 300 is used to seal both ends of the connector body 200, it needs to contact both the connector body 200 and the cable. This embodiment strengthens the connection by providing an interface compatibilizer in the area where the end sealing connector and the connector body 200 contact each other, and by providing a primer between the end sealing structure 300 and the cable, effectively improving the sealing performance of the end sealing structure 300 and enhancing the waterproof effect.

[0045] The primer layer and the interface compatibilizer layer are the coatings corresponding to the primer and the interface compatibilizer, respectively.

[0046] It should be noted that the area in contact between the cable and the end sealing structure 300 can vary depending on the actual situation. For example, when the end sealing structure 300 only covers the semi-conductive layer 1003 of the cable, the primer is placed between the semi-conductive layer 1003 and the end sealing structure 300. When the end sealing structure 300 covers the core shielding layer 1004 of the cable from the semi-conductive layer 1003, the primer can be selectively placed on the semi-conductive layer 1003, the core shielding layer 1004, or on a portion of the semi-conductive layer 1003 and the core shielding layer 1004, as needed.

[0047] Combination Figure 4In some embodiments of this utility model, the end sealing structure 300 includes sealant and a waterproof tape wrapped around the sealant. During installation, sealant is first wrapped around the end of the connector body 200, overlapping the sealant onto the outer circumferential surface of the connector body 200 during wrapping. Then, the waterproof tape is wrapped around the end, completely encasing the sealant. Along the length of the cable, both the sealant and the waterproof tape extend to cover the core shielding layer 1004.

[0048] In this embodiment, an interface compatibilizer is applied to the outer peripheral wall of the connector body 200, which is wrapped by the waterproof tape and in direct contact with it, thereby improving the adhesion between the waterproof tape and the connector body 200. A primer is applied to the core shielding layer 1004, which is in contact with the sealant. Using this structural configuration, the application of an interface compatibilizer to the surface of the connector body 200 enhances the adhesion strength between the waterproof tape and the silicone rubber connector body 200. The application of a primer to the core shielding layer 1004 improves the adhesion strength of the sealant, enhances the waterproof performance at both ends of the connector body 200, and effectively prevents moisture from penetrating into the interior of the connector body 200.

[0049] Reference Figure 4 In some embodiments of this utility model, the end sealing structure 300 further includes a heat-shrinkable semi-conductive tube 301, which covers the end sealing structure 300. Specifically, after the end sealing structure 300 is constructed, a heat-shrinkable semi-conductive tube 301 is shrunk at each end of the connector body 200. In this embodiment, the end sealing structure 300 only covers the semi-conductive layer 1003 of the cable, so that the heat-shrinkable semi-conductive tube 301 covers the semi-conductive layer 1003 of the cable from the circumferential surface of the connector body 200.

[0050] In this embodiment, the heat-shrinkable semiconducting tube 301 is provided with hot melt adhesive at both ends, and the hot melt adhesive at both ends is used to seal the connection on the inside during the wrapping process.

[0051] Meanwhile, waterproof tape can be further wrapped around both ends of the heat-shrinkable semi-conductive tube 301 to further improve the sealing performance. During the wrapping process, the entire connector body 200 is wrapped, first with waterproof tape, covering the cable core shielding layer 1004, and then with PVC tape. Constant force springs are used to fix both ends.

[0052] Reference Figure 3In some embodiments of this invention, when the connected cable is a three-phase cable, the waterproof intermediate joint further includes a cold-shrink finger sleeve 600. The cold-shrink finger sleeve 600 is disposed at the three-phase branch point of the cable. One end of the cold-shrink finger sleeve 600 is fitted onto the outer sheath 1005 of the cable, and the other end has three fingers, each fitted onto one of the three phase cables. A first sealing ring 601 is provided between the cold-shrink finger sleeve 600 and the phase cables for sealing and fixation. A second sealing ring 602 is provided between the cold-shrink finger sleeve 600 and the outer sheath 1005 of the cable for sealing and fixation.

[0053] Reference Figure 1 In some embodiments of this utility model, the waterproof intermediate joint further includes a third waterproof layer, which covers the outer sheath 1005 of the cable. Specifically, the third waterproof layer is wrapped with waterproof tape and PVC tape from the inside out. During installation, the entire joint area is first wrapped with waterproof tape, which wraps from the outer sheath 1005 of one cable to the outer sheath 1005 of another cable, and then PVC tape is wrapped around it.

[0054] In summary, the waterproof intermediate joint of this utility model has multiple layers of sealing and waterproofing from the inside out, including:

[0055] The tapered step 10021 and the connecting structure 100 form a first layer of waterproofing near the wire core 1001;

[0056] By setting an interface compatibilizer between the connector body 200 and the cable core insulation layer 1002 to replace conventional silicone oil and silicone grease, a second waterproof layer is formed. This can reduce local air gap discharge, improve the partial discharge performance of the product, and prevent failures caused by water vapor penetration along the interface, thereby improving the stability of product operation.

[0057] By applying a primer and an interface compatibilizer to both ends of the joint body 200, a third layer of waterproofing is formed, which effectively prevents water vapor and moisture from penetrating into the interior of the joint body 200.

[0058] By setting heat-shrinkable semi-conductive tubing 301 to cover the end sealing structure 300, and wrapping it with waterproof tape and PVC tape, a fourth layer of waterproofing is formed to further prevent water vapor and moisture from penetrating.

[0059] A fifth layer of waterproofing is formed by setting up cold-shrink finger sleeves 600, sealing rings, and overall wrapping waterproof tape and PVC tape.

[0060] The above-mentioned structural design effectively improves the waterproof performance of the waterproof intermediate joint, ensuring the safe, stable and reliable operation of the product under long-term water immersion conditions.

[0061] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A waterproof intermediate joint, characterized by, include: A connection structure is disposed on the outside of the cable core and is in contact with the cable core insulation layer; The first waterproof layer is disposed on the outer periphery of the connection structure and the core insulation layer, and covers the semiconductive layer of the cable along the length of the cable. The first waterproof layer is a coated interface compatibilizer. The connector body is disposed on the outer periphery of the first waterproof layer; An end sealing structure is provided at both ends of the connector body; A second waterproof layer is disposed between the joint body and the end sealing structure, and the second waterproof layer includes a coated interface compatibilizer and / or primer.

2. The waterproof intermediate joint according to claim 1, characterized in that, The connection structure includes a connecting tube sleeved on the wire core, and a tapered step is provided on the side of the wire core insulation layer near the connecting tube.

3. The waterproof intermediate joint according to claim 2, characterized in that, The connection structure, from the inside out, also includes: waterproof sealant wrapped between the connecting tube and the tapered step, a semi-conductive tape wrapped around the outer periphery of the connecting tube and connected to the wire core insulation layer, and an insulating self-adhesive tape wrapped around and covering the outside of the wire core insulation layer.

4. The waterproof intermediate joint of claim 1, wherein The second waterproof layer includes an interface compatibilizer layer disposed between the connector body and the end sealing structure, and a primer layer disposed between the cable and the end sealing structure.

5. The waterproof intermediate joint according to claim 4, characterized in that, The end sealing structure includes a sealant and a waterproof tape wrapping the sealant. The interface compatibilizer layer is at least disposed on the outer peripheral wall of the connector body in contact with the waterproof tape, and the primer layer is at least disposed on the outer peripheral wall of the cable contact sealant.

6. The waterproof intermediate joint of claim 1, wherein, The end sealing structure includes a heat-shrinkable semi-conductive tube, which covers both ends of the connector body.

7. The waterproof intermediate joint of claim 6, wherein, Hot melt adhesive is applied to both ends of the heat-shrinkable semiconducting tube.

8. The waterproof intermediate joint of claim 6, wherein, Waterproof tape is wrapped around both ends of the heat-shrinkable semiconducting tube.

9. The waterproof intermediate joint of claim 1, wherein, The waterproof intermediate joint also includes a cold shrink finger sleeve, which is set at the three-phase bifurcation of the cable. A first sealing ring is set between the cold shrink finger sleeve and the phase cable of the cable, and a second sealing ring is set between the cold shrink finger sleeve and the main cable of the cable.

10. The waterproof intermediate joint of claim 9, wherein, The waterproof intermediate joint also includes a third waterproof layer, which covers the outer sheath of the cable and is wrapped with waterproof tape and PVC tape from the inside out.

Images