Vacuum welded cable head

Abstract

The utility model belongs to cable connection technical field especially relates to cable head of vacuum welding, wherein one kind vacuum welded cable head, include: cable body, its end portion is from outside to inside in proper order to peel off outer sheath, aluminium sheath and semi -conductive nylon layer, sealing device, its sleeve is established in aluminium sheath end portion, and with vacuum pump intercommunication, protection shell, is sealed with aluminium sheath through solder layer and connects, wherein, through peeling off semi -conductive nylon layer, to make aluminium sheath and cable outer shield between the reserved gap form air heat insulating layer, sealing device seals air heat insulating layer, and vacuum pump negative pressure suction air heat insulating layer to form vacuum layer, through the cooperation of sealing device and vacuum pump, after sealing device seals air heat insulating layer, vacuum pump to its negative pressure suction vacuum, to insulate the heat transfer to cable body inside in the welding process.

Description

Technical Field

[0001] This utility model belongs to the field of cable connection technology, and particularly relates to cable heads welded in vacuum. Background Technology

[0002] A typical high-voltage cable in a power system is an aluminum-sheathed power cable. Usually, the protective shell of the cable joint is welded to the aluminum sheath of the cable. Due to the high temperature of welding, the cable shielding layer or the cable insulation layer is easily damaged during the welding process, which will seriously reduce the performance of the cable and affect the safe and stable operation of the power system.

[0003] Therefore, how to prevent heat from being transferred to the cable shielding layer or cable insulation layer during the welding process is a technical problem that urgently needs to be solved in this field.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Utility Model Content

[0005] This disclosure provides at least one vacuum-welded cable head.

[0006] In a first aspect, embodiments of this disclosure provide a vacuum-welded cable head, comprising: The cable body, from the outside to the inside, has its outer sheath, aluminum sheath and semi-conductive nylon layer peeled off in sequence; A sealing device, which is fitted onto the end of an aluminum sheath and is connected to a vacuum pump; The protective shell is sealed to the aluminum sheath via a solder layer. In this process, by removing the semi-conductive nylon layer, an air insulation layer is formed by leaving a gap between the aluminum sheath and the outer shield of the cable. The sealing device seals the air insulation layer, and negative pressure is used to draw the air insulation layer to form a vacuum layer.

[0007] In one alternative embodiment, the sealing device includes: A heat-shrink cap, one end of which is open and fitted onto the end of an aluminum sheath; One-way air nozzle, which is located on the side wall of the heat shrink cap; The air tube connects the one-way air nozzle to the vacuum pump.

[0008] In one alternative embodiment, the port of the aluminum sheath is expanded into a flared opening to radially limit solder overflow.

[0009] In one alternative embodiment, a seal is provided at the end of the cable body away from the sealing device, the seal being used to seal the air between the aluminum sheath and the outer shield of the cable.

[0010] In one alternative embodiment, the seal is a heat shrink tubing, cold shrink tubing, or tape wound seal.

[0011] In one alternative embodiment, a retaining ring is wound around the outer wall of the aluminum sheath near the protective shell, the retaining ring being used to limit the axial overflow of solder.

[0012] In one alternative embodiment, the radial thickness of the retaining ring is greater than the thickness of the solder layer.

[0013] In one alternative embodiment, the protective shell has a tapered end, and a flared aluminum sheath is located inside the protective shell.

[0014] The beneficial effect of this utility model is that it provides a vacuum-welded cable head. By setting a sealing device, after the air insulation layer is sealed by the sealing device, the vacuum pump draws a vacuum under negative pressure to isolate the heat from being transferred to the inside of the cable body during the welding process.

[0015] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A perspective view of a vacuum-welded cable head provided in an embodiment of this disclosure; Figure 2 A perspective view of the cable body stripped in the form of an embodiment of this disclosure; Figure 3 A perspective view of the protective casing provided in an embodiment of this disclosure.

[0019] In the picture: 1. Cable body; 11. Outer sheath; 12. Aluminum sheath; 13. Semi-conductive nylon layer; 14. Sealing element; 15. Air insulation layer; 2. Sealing device; 21. Heat shrink cap; 22. One-way valve; 23. Air tube; 3. Protective shell; 4. Vacuum pump; 5. Material retaining ring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0022] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0023] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0024] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0025] Research has found that, among the relevant technologies, the most typical high-voltage cables in power systems are aluminum-sheathed power cables. Usually, the protective shell of the cable joint is welded to the aluminum sheath of the cable. Due to the high temperature of welding, the cable shielding layer or the cable insulation layer is easily damaged during the welding process, which will seriously reduce the performance of the cable and affect the safe and stable operation of the power system.

[0026] Therefore, how to prevent heat from being transferred to the cable shielding layer or cable insulation layer during the welding process is a technical problem that urgently needs to be solved in this field.

[0027] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0030] like Figures 1 to 3 As shown, at least one embodiment provides a vacuum-welded cable head, comprising: The cable body 1 has its outer sheath 11, aluminum sheath 12, and semi-conductive nylon layer 13 stripped sequentially from the outside in at its ends. Removing the semi-conductive nylon layer 13 creates a pre-existing gap between the aluminum sheath 12 and the cable's outer shield, forming an air insulation layer 15. After stripping, the pre-existing gap between the aluminum sheath 12 and the cable's outer shield forms the air insulation layer 15. Special tools are required during the stripping process to ensure the complete removal of the semi-conductive nylon layer 13, maximizing the air layer thickness. A sealing device 2 is fitted onto the end of the aluminum sheath 12 and is connected to a vacuum pump 4. A protective shell 3 is sealed to the aluminum sheath 12 via a solder layer. The sealing device 2 seals the air insulation layer 15, and the vacuum pump 4 draws negative pressure into the air insulation layer 15 to form a vacuum layer. Through the cooperation of the sealing device 2 and the vacuum pump 4, after the sealing device 2 seals the air insulation layer 15, the vacuum pump 4 draws negative pressure into it to prevent heat transfer during welding to the inside of the cable body 1.

[0031] Reference Appendix Figure 1 The sealing device 2 includes: a heat-shrinkable cap 21, one end of which is open and fitted onto the end of the aluminum sleeve 12; after the outer sleeve 11 is removed, the port of the aluminum sleeve 12 expands into a flared opening to radially limit the overflow of solder. The heat-shrinkable cap 21 is positioned with its open end facing the flared aluminum sleeve 12 and fitted onto the outer wall of the aluminum sleeve 12, forming a sealed space with the aluminum sleeve 12; a one-way air nozzle 22, located on the side wall of the heat-shrinkable cap 21; and an air pipe 23 connecting the one-way air nozzle 22 to the vacuum pump 4. After the heat-shrinkable cap 21 and the aluminum sleeve 12 are sealed, the vacuum pump 4 creates a vacuum in the sealed space through the air pipe 23, transforming the original air insulation layer 15 into a vacuum layer to prevent heat transfer to the interior during the welding process.

[0032] Reference Appendix Figure 2 To improve the sealing and vacuum effect, a sealing element 14 is provided at the end of the cable body 1 away from the sealing device 2. The sealing element 14 is used to seal the air between the aluminum sheath 12 and the outer shield of the cable. The sealing element 14 is a heat shrink tubing, cold shrink tubing, or tape wound seal.

[0033] Reference Appendix Figure 1 A retaining ring 5 is wound around the outer wall of the aluminum sheath 12 near the protective shell 3. The retaining ring 5 is used to limit the axial overflow of solder. A double-layer winding structure is adopted (the inner layer is fiberglass tape, and the outer layer is polytetrafluoroethylene tape). The radial thickness of the retaining ring 5 is greater than the thickness of the solder layer. Before installation, the port of the aluminum sheath 12 needs to be expanded into a flared shape using a hydraulic flaring tool to control the angle (approximately 15-30 degrees). The inner fiberglass tape of the retaining ring 5 provides mechanical support, while the outer polytetrafluoroethylene tape is heat-resistant (>200°C) and prevents solder adhesion. The overall thickness is greater than the solder layer thickness to ensure effective blocking of solder overflow.

[0034] Reference Appendix Figure 3 The protective shell 3 has a tapered end, and a flared aluminum sheath 12 is located inside the protective shell 3. The protective shell 3 is sealed to the aluminum sheath 12 through a solder layer. The protective shell 3 has a tapered end, and a flared aluminum sheath 12 is located inside the protective shell 3. The port of the aluminum sheath 12 is expanded into a flared shape to limit solder overflow. The protective shell 3 is a cable joint (such as an outdoor cable terminal, GIS cable terminal, or cable intermediate joint) protective shell 3, generally made of copper or aluminum alloy, used to seal the connection with the cable aluminum sheath 12.

[0035] The working principle is as follows: Strip the cable ends: outer sheath 11 → aluminum sheath 12 (end flared) → semi-conductive nylon layer 13 (forming air insulation layer 15).

[0036] The heat-shrink cap 21 is fitted onto the outer wall of the flared aluminum sheath 12 and is connected to the vacuum pump 4 through the air pipe 23. The retaining ring 5 is installed at the end of the aluminum sheath 12.

[0037] Apply solder and connect the sealing protective shell 3.

[0038] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0040] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A vacuum-welded cable head, characterized in that, include: The cable body (1) has its outer sheath (11), aluminum sheath (12) and semi-conductive nylon layer (13) peeled off from the outside to the inside at its ends. A sealing device (2) is fitted onto the end of an aluminum sheath (12) and is connected to a vacuum pump (4); The protective shell (3) is sealed to the aluminum sheath (12) through a solder layer; Among them, by removing the semi-conductive nylon layer (13), an air insulation layer is formed by leaving a gap between the aluminum sheath (12) and the outer shield of the cable; The sealing device (2) seals the air insulation layer and draws the air insulation layer under negative pressure to form a vacuum layer.

2. The vacuum-welded cable head as described in claim 1, characterized in that, The sealing device (2) includes: A heat-shrink cap (21) has an open end and is fitted onto the end of an aluminum sheath (12); One-way air nozzle (22) is located on the side wall of heat shrink cap (21); The air tube (23) connects the one-way air nozzle (22) to the vacuum pump (4).

3. The vacuum-welded cable head as described in claim 1, characterized in that, The port of the aluminum sheath (12) is expanded into a flared opening to radially limit solder overflow.

4. The vacuum-welded cable head as described in claim 1, characterized in that, A sealing element (14) is provided at the end of the cable body (1) away from the sealing device (2), and the sealing element (14) is used to seal the air between the aluminum sheath (12) and the outer shield of the cable.

5. The vacuum-welded cable head as described in claim 4, characterized in that, The sealing element (14) is a heat shrink tubing, cold shrink tubing, or tape wound seal.

6. The vacuum-welded cable head as described in claim 1, characterized in that, A baffle ring (5) is wrapped around the outer wall of the aluminum sheath (12) near the protective shell (3). The baffle ring (5) is used to limit the axial overflow of solder.

7. The vacuum-welded cable head as described in claim 6, characterized in that, The radial thickness of the retaining ring (5) is greater than the thickness of the solder layer.

8. The vacuum-welded cable head as described in claim 1, characterized in that, The protective shell (3) has a tapered end, and the flared aluminum sheath (12) is located inside the protective shell (3).

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