Connection device and process for connecting a high-voltage cable accessory connecting sleeve and a cable metal bellows

Abstract

The present invention discloses a connection device and process between a connection sleeve of a high-voltage cable accessory and a cable metal bellows, which relates to the technical field of power cables. The connection sleeve and the cable metal bellows are connected through the connection device. The connection sleeve is a metal transition connection sleeve; the connection device is a transition metal component; the material of the transition metal component is the same as that of the cable metal bellows; the transition metal component and the cable metal bellows are connected through a welding process; part of the material of the metal transition connection sleeve is the same as that of the transition metal component, and the metal transition connection sleeve and the transition metal component are connected through a welding process; the metal transition connection sleeve is a copper-aluminum transition connection sleeve; the transition metal component is a transition aluminum component; the cable metal bellows is a cable aluminum bellows. This connection device solves the problems that the quality of the existing lead-brazing connection process is greatly affected by construction personnel factors and it is easy to scald the cable, and the connection between the connection sleeve and the cable metal bellows is stable and the connection quality is high.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and particularly relates to a connecting device for connecting a connecting sleeve of a high-voltage cable accessory and a cable metal corrugated pipe. Background Art

[0002] High-voltage cable accessories (also known as high-voltage power cable accessories) are divided into high-voltage intermediate joint accessories and high-voltage terminal accessories. The connection between the copper shell in the high-voltage intermediate joint accessory and the cable metal corrugated pipe in the cable, and the connection between the grounding sleeve in the high-voltage terminal accessory and the cable metal corrugated pipe in the cable mostly adopt the lead-brazing process for connection. The copper shell and the grounding sleeve can be called connecting sleeves.

[0003] The process of the existing lead-brazing process is as follows: First, preheat the lead-brazing positions of the connecting sleeve in the high-voltage cable accessory and the cable metal corrugated pipe, then use lead bars and tin bars respectively to carry out a bottoming treatment on the lead-brazing positions of the connecting sleeve and the cable metal corrugated pipe in the high-voltage cable accessory, and finally apply the heated and molten lead bars on the connecting sleeve and the cable metal corrugated pipe in the high-voltage cable accessory and press them tightly, with an apple-like shape. However, the quality of the existing lead-brazing process cannot meet the needs of long-term safe and reliable operation, and lead-brazing quality problems account for about 40% of cable failures. The existing lead-brazing process has the following deficiencies:

[0004] 1. Before lead-brazing, it is necessary to preheat the connecting sleeve in the high-voltage cable accessory and the cable metal corrugated pipe. At the same time, the temperature of the molten lead bar is about 250°C, which may cause burns to the outer shielding layer of the cable, resulting in breakdown at the burned part after several years.

[0005] 2. If the asphalt on the surface of the cable metal corrugated pipe is not thoroughly cleaned or the bottoming supplement is insufficient, it is easy to cause poor adhesion, virtual connection or detachment of the lead-brazing, resulting in heating at the lead-brazing position and failure.

[0006] 3. The quality of the lead-brazing process mainly depends on the construction personnel, and is greatly affected by human factors. If the lead-brazing quality does not meet the standard, for example, if the lead-brazing is uneven and there are air holes inside, it will cause defects such as loosening and cracking after a long time. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above-mentioned existing problems, and provide a connecting device for connecting a connecting sleeve of a high-voltage cable accessory and a cable metal corrugated pipe. This connecting device solves the problems that the quality of the existing lead-brazing connection process is greatly affected by construction personnel factors and is easy to burn the cable, and the connection between the connecting sleeve and the cable metal corrugated pipe is stable and the connection quality is high.

[0008] Another purpose of the present invention is to provide a connecting process for connecting a connecting sleeve of a high-voltage cable accessory and a cable metal corrugated pipe.

[0009] The object of the present invention is achieved by the following technical solutions:

[0010] A connecting device for a connecting sleeve of a high-voltage cable accessory and a cable metal bellows. The connecting sleeve in the high-voltage cable accessory is connected to the cable metal bellows in the cable through the connecting device. Among them, the connecting sleeve is a metal transition connecting sleeve; the connecting device is a transition metal component; the material of the transition metal component is the same as that of the cable metal bellows; the transition metal component and the cable metal bellows are connected by a welding process; a part of the material of the metal transition connecting sleeve is the same as that of the transition metal component, and the metal transition connecting sleeve and the transition metal component are connected by a welding process; among them, the metal transition connecting sleeve is a copper-aluminum transition connecting sleeve; the transition metal component is a transition aluminum component; the cable metal bellows is a cable aluminum bellows.

[0011] The working principle of the above-mentioned connecting device for the connecting sleeve of the high-voltage cable accessory and the cable metal bellows is:

[0012] The copper-aluminum transition connecting sleeve, the transition aluminum component, and the cable aluminum bellows all have the same aluminum material. Compared with copper and silver, the aluminum material has a lower cost, and using the same aluminum material enables the connection between the transition aluminum component and the cable aluminum bellows, and between the copper-aluminum transition connecting sleeve and the transition aluminum component through a welding process, achieving a high-seal connection and improving the connection quality between the connecting sleeve and the cable metal bellows.

[0013] Preferably, the cable metal bellows is a spiral cable metal bellows, and the transition aluminum component includes a transition aluminum tube and an aluminum spacer; the transition aluminum tube is sleeved on the cable metal bellows, there is a gap between the transition aluminum tube and the cable metal bellows, the aluminum spacer is arranged on the gap, the transition aluminum tube and the cable metal bellows are connected by a welding process, the aluminum spacer and the transition aluminum tube as well as the cable metal bellows are connected by a welding process, and the copper-aluminum transition connecting sleeve and the transition aluminum tube are connected by a welding process. In the above structure, since the cable metal bellows is a spiral cable metal bellows, there will be a gap after the transition aluminum tube is sleeved on the cable metal bellows, and the aluminum spacer fills the gap to achieve a sealed connection and improve the connection quality.

[0014] Preferably, the cable metal bellows has a first wave crest and a first wave trough; one end of the transition aluminum tube is provided with a circumferential spiral structure, and the pitch of the spiral structure is the same as the wave pitch of the first wave crest of the cable metal bellows; the position of the spiral structure of the transition aluminum tube and the position of the first wave crest of the cable metal bellows are connected by a welding process; a notch is formed between the first wave trough of the cable metal bellows and the transition aluminum tube. In the above structure, the end face of one end of the transition aluminum tube is a circumferential spiral end face, and the spiral end face forms the spiral structure. The pitch of the spiral structure is the same as the wave pitch of the first wave crest of the cable metal bellows, so that the spiral end face can correspond to the position of the first wave crest of the cable metal bellows, and thus the position of the spiral structure and the position of the first wave crest of the cable metal bellows can be connected by a welding process to improve the connection tightness. After welding, there is a notch at the position of the first wave trough, and the aluminum spacer can fill the notch.

[0015] Preferably, the outer side of the aluminum spacer is arc-shaped, and the inner side of the aluminum spacer is provided with a corrugated structure. The corrugated structure includes a second wave crest and second wave troughs arranged on both sides of the second wave crest. The wave pitch of the second wave troughs of the corrugated structure is the same as the wave pitch of the first wave trough of the cable metal bellows; the arc diameter of the arc shape of the aluminum spacer is the same as the diameter of the transition aluminum tube. By setting the above structure, it is convenient for the aluminum spacer to fill the notch, and it is convenient to cooperate and connect with the transition aluminum tube and the cable metal bellows to improve the connection quality and make the structure more compact.

[0016] Preferably, the circumferential side of the aluminum spacer and the first wave crest of the cable metal bellows and the transition aluminum tube are connected by a laser welding process; the inner side of the aluminum spacer and the first wave trough of the cable metal bellows are connected by a soldering process or the gap is filled with a sealant for connection; the position of the spiral structure of the transition aluminum tube and the position of the first wave crest of the cable metal bellows are connected by a laser welding process. The use of the laser welding process and the soldering process makes the connection relatively reliable, will not scald the cable, and has the characteristics of high tightness and mechanical strength.

[0017] Preferably, the inner diameter of the transition aluminum tube is larger than the outer diameter of the first wave crest of the cable metal bellows. The purpose is to facilitate the transition aluminum tube to be sleeved on the cable metal bellows and improve the installation convenience.

[0018] Furthermore, the inner diameter of the transition aluminum tube is larger than the outer diameter of the first wave crest of the cable metal bellows by 1 mm to 2 mm. The purpose is that the inner diameter of the transition aluminum tube should not be too large. If the inner diameter is too large, the gap between the transition aluminum tube and the cable metal bellows will be larger, which is not easy to weld and the tightness will be reduced.

[0019] Preferably, the thickness of the transition aluminum tube is greater than that of the cable metal bellows. To ensure the current-carrying capacity of the transition aluminum tube, the thickness of the transition aluminum tube should not be less than that of the cable metal bellows. If the thickness is less than that of the cable metal bellows, i.e., the current-carrying capacity is less than that of the cable metal bellows, it is easy to cause heating. At the same time, the thickness should not be too thick. The thicker the thickness, the larger the volume and weight of the laser welding equipment, which affects the convenience of on-site use. Therefore, the thickness of the transition aluminum tube is slightly greater than that of the cable metal bellows. For example, the thickness of the transition aluminum tube is 1 mm greater than that of the cable metal bellows.

[0020] Preferably, the high-voltage cable accessory is a high-voltage cable joint, and the copper-aluminum transition connecting sleeve is a copper-aluminum transition copper outer shell; the copper-aluminum transition copper outer shell includes a copper outer shell and first aluminum sleeves provided at both ends of the copper outer shell; the first aluminum sleeves are connected to the transition aluminum tube by a welding process.

[0021] Preferably, the high-voltage cable accessory is a high-voltage terminal accessory, the copper-aluminum transition connecting sleeve is a copper-aluminum transition grounding sleeve, the copper-aluminum transition grounding sleeve includes a grounding sleeve and a second aluminum sleeve provided at the bottom of the grounding sleeve, and the second aluminum sleeve is connected to the transition aluminum tube by a welding process.

[0022] A connection process for a high-voltage cable accessory connecting sleeve and a cable metal bellows, the connection process is applied to a connecting device, and the connection process includes the following steps:

[0023] (1) Sleeve the transition aluminum tube on the cable metal bellows, and the spiral structure position of the transition aluminum tube corresponds to the first wave crest position of the cable metal bellows;

[0024] (2) Then laser-weld the spiral structure position of the transition aluminum tube and the first wave crest position of the cable metal bellows by a laser welding device;

[0025] (3) Fill the notch with an aluminum spacer block, and laser-weld the circumferential side of the aluminum spacer block with the first wave crest of the cable metal bellows and the transition aluminum tube by a laser welding device; the inner side of the aluminum spacer block is connected to the first wave trough of the cable metal bellows by a soldering process or filled with a sealant to connect the gap;

[0026] (4) Sleeve the copper-aluminum transition connecting sleeve on the transition aluminum tube, and laser-weld the copper-aluminum transition connecting sleeve and the transition aluminum tube by a laser welding device.

[0027] The present invention has the following beneficial effects compared with the prior art:

[0028] 1. The connecting device in the present invention provides a reliable and safe connection method for the connection between the connecting sleeve in the high-voltage cable accessory and the cable metal bellows in the cable.

[0029] 2. In the connecting device of the present invention, the copper-aluminum transition connecting sleeve, the transition aluminum component, and the cable aluminum bellows are all made of the same aluminum material, enabling welding between the transition aluminum component and the cable metal bellows, and between the copper-aluminum transition connecting sleeve and the transition aluminum component. This solves the problems that the quality of the existing lead-tinning connection process is greatly affected by construction personnel and it is easy to scald the cable. At the same time, the welding process has the characteristics of high sealing and mechanical strength, and the connection between the connecting sleeve and the cable metal bellows is stable with high connection quality; it further improves the quality of high-voltage cable accessories, avoiding power outages and negative impacts caused by unreliable grounding connections of high-voltage cable accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the connecting device in the present invention after connecting the connecting sleeve of one embodiment to the cable metal bellows.

[0031] Figure 2 It is a three-dimensional structural diagram of the connecting device in the present invention after connecting to the cable metal bellows.

[0032] Figure 3 It is a partial three-dimensional structural diagram of the connecting device in the present invention after connecting to the cable metal bellows.

[0033] Figure 4 It is a partial structural diagram of the connecting device in the present invention after connecting to the cable metal bellows.

[0034] Figure 5 It is a three-dimensional structural diagram of the transition aluminum tube in the present invention.

[0035] Figure 6 It is a three-dimensional structural diagram of the aluminum spacer in the present invention.

[0036] Figure 7 It is a three-dimensional structural diagram of the aluminum spacer in the present invention from different perspective directions.

[0037] Figure 8 It is a cross-sectional view of the copper-aluminum transition copper shell in the present invention.

[0038] Figure 9 It is a schematic structural diagram of the connecting device in the present invention after connecting the connecting sleeve of another embodiment to the cable metal bellows.

[0039] Figure 10 It is a cross-sectional view of the copper-aluminum transition grounding sleeve in the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0040] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with embodiments and drawings. However, the implementation manners of the present invention are not limited thereto. Embodiment 1

[0041] See Figures 1-4 , this embodiment discloses a connecting device between a connecting sleeve of a high-voltage cable accessory and a cable metal bellows, which solves the problems of scalding the cable and difficult quality control in the current lead-brazing process. The connecting sleeve in the high-voltage cable accessory is connected to the cable metal bellows 1 in the cable through a connecting device, wherein the connecting sleeve is a metal transition connecting sleeve; the connecting device is a transition metal component; the material of the transition metal component is the same as that of the cable metal bellows 1; the transition metal component and the cable metal bellows 1 are connected by a welding process; a part of the material of the metal transition connecting sleeve is the same as that of the transition metal component, and the metal transition connecting sleeve and the transition metal component are connected by a welding process.

[0042] See Figures 1-4 , the metal transition connecting sleeve is a copper-aluminum transition connecting sleeve; the transition metal component is a transition aluminum component; the cable metal bellows 1 is a cable aluminum bellows; the transition aluminum component and the cable aluminum bellows are connected by a welding process; the copper-aluminum transition connecting sleeve and the transition aluminum component are connected by a welding process. In the above structure, the copper-aluminum transition connecting sleeve, the transition aluminum component, and the cable aluminum bellows all have the same aluminum material, so that the transition aluminum component and the cable aluminum bellows, and the copper-aluminum transition connecting sleeve and the transition aluminum component are connected by a welding process, realizing a high-seal connection and improving the connection quality between the connecting sleeve and the cable metal bellows 1.

[0043] See Figures 1-7 , the cable metal bellows 1 (cable aluminum bellows) is a spiral cable metal bellows 1 (cable aluminum bellows), and the transition aluminum component includes a transition aluminum tube 2 and an aluminum spacer 3; the transition aluminum tube 2 is sleeved on the cable metal bellows 1, there is a gap 6 between the transition aluminum tube 2 and the cable metal bellows 1, the aluminum spacer 3 is arranged on the gap 6, the transition aluminum tube 2 and the cable metal bellows 1 are connected by a welding process, the aluminum spacer 3 and the transition aluminum tube 2 and the cable metal bellows 1 are connected by a welding process, and the copper-aluminum transition connecting sleeve and the transition aluminum tube 2 are connected by a welding process. In the above structure, since the cable metal bellows 1 is a spiral cable metal bellows 1, there will be a gap 6 after the transition aluminum tube 2 is sleeved on the cable metal bellows 1, and the aluminum spacer 3 fills the gap 6 to achieve a sealed connection and improve the connection quality.

[0044] See Figures 1-7, the cable metal bellows 1 has a first wave crest 11 and a first wave trough 12; one end of the transition aluminum tube 2 is provided with a circumferential spiral structure 21, and the pitch of the spiral structure 21 is the same as the wave pitch of the first wave crest 11 of the cable metal bellows 1; the position of the spiral structure 21 of the transition aluminum tube 2 and the position of the first wave crest 11 of the cable metal bellows 1 are connected by a welding process; the above-mentioned notch 6 is formed between the first wave trough 12 of the cable metal bellows 1 and the transition aluminum tube 2. In the above structure, the end face of one end of the transition aluminum tube 2 is a circumferential spiral end face, that is, the end face spirals 360°, and the start and end positions of the spiral end face are connected by a straight face. The spiral end face forms the spiral structure 21, and the pitch of the spiral structure 21 is the same as the wave pitch of the first wave crest 11 of the cable metal bellows 1, so that the spiral end face can correspond to the position of the first wave crest 11 of the cable metal bellows 1, and thus the position of the spiral structure 21 and the position of the first wave crest 11 of the cable metal bellows 1 can be connected by a welding process to improve the connection tightness. After welding, there is a notch 6 at the position of the first wave trough 12, and the aluminum spacer 3 can fill the notch 6.

[0045] See Figures 1-7 , the cable metal bellows 1 is a cable aluminum bellows, and the transition aluminum tube 2 is made of the same material as the cable metal bellows 1. The structure of the transition aluminum tube 2 is cylindrical, and the length is about 100 mm (the length can be flexibly adjusted according to the actual situation). The aluminum spacer 3 is made of the same material as the cable metal bellows 1; the length of the aluminum spacer 3 is about 30 mm, and the width is equal to the wave pitch of the cable metal bellows 1. The wave pitch of the cable metal bellows 1 is the wave pitch of the first wave crest 11 or the first wave trough 12 of the cable metal bellows 1.

[0046] See Figures 1-7 , the outer side 31 of the aluminum spacer 3 is arc-shaped, and the inner side 32 of the aluminum spacer 3 is provided with a corrugated structure. The corrugated structure includes a second wave crest 321 and second wave troughs 322 arranged on both sides of the second wave crest 321. The wave pitch of the second wave troughs 322 of the corrugated structure is the same as the wave pitch of the first wave trough 12 (or the first wave crest 11) of the cable metal bellows 1; the arc diameter of the arc shape of the aluminum spacer 3 is the same as the diameter of the transition aluminum tube 2. By setting the above structure, the aluminum spacer 3 is convenient for filling the notch 6, facilitating the fitting connection with the transition aluminum tube 2 and the cable metal bellows 1 to improve the connection quality and make the structure more compact.

[0047] See Figures 1-7, the peripheral side 33 of the aluminum spacer block 3 is connected to the first wave crest 11 of the cable metal bellows 1 and the transition aluminum tube 2 through a laser welding process; the inner side 32 of the aluminum spacer block 3 is connected to the first wave trough 12 of the cable metal bellows 1 through a soldering process; the position of the spiral structure 21 of the transition aluminum tube 2 is connected to the position of the first wave crest 11 of the cable metal bellows 1 through a laser welding process. The use of the laser welding process and the soldering process makes the connection relatively reliable, will not scald the cable, and has the characteristics of high sealing performance and mechanical strength. During connection, the second wave crest 321 cooperates with the first wave trough 12 to improve the sealing performance and structural compactness.

[0048] See Figures 1-7 , the inner diameter of the transition aluminum tube 2 is larger than the outer diameter of the first wave crest 11 of the cable metal bellows 1. The purpose is to facilitate the sleeving of the transition aluminum tube 2 on the cable metal bellows 1 and improve the installation convenience.

[0049] See Figures 1-7 , the inner diameter of the transition aluminum tube 2 is larger than the outer diameter of the first wave crest 11 of the cable metal bellows 1 by 1 mm to 2 mm. The purpose is that the inner diameter of the transition aluminum tube 2 should not be too large. If the inner diameter is too large, the gap between the transition aluminum tube 2 and the cable metal bellows 1 will be larger, making it not easy to weld and reducing the sealing performance.

[0050] See Figures 1-7 , the thickness of the transition aluminum tube 2 is larger than the thickness of the cable metal bellows 1. In order to ensure the current-carrying capacity of the transition aluminum tube 2, the thickness of the transition aluminum tube 2 should not be less than the thickness of the cable metal bellows 1. If the thickness is less than the thickness of the cable metal bellows 1, that is, the current-carrying capacity is less than that of the cable metal bellows 1, it is easy to cause a heating phenomenon. At the same time, the thickness cannot be too thick. The thicker the thickness, the larger the volume and weight of the laser welding equipment, which affects the on-site use convenience. Therefore, the thickness of the transition aluminum tube 2 is slightly larger than the thickness of the cable metal bellows 1. For example, the thickness of the transition aluminum tube 2 is 1 mm larger than the thickness of the cable metal bellows 1.

[0051] See Figures 1-8, the high-voltage cable accessory is a high-voltage cable joint, and the copper-aluminum transition connecting sleeve is a copper-aluminum transition copper outer shell 4; the copper-aluminum transition copper outer shell 4 includes a copper outer shell 41 and two first aluminum sleeves 42, and the two first aluminum sleeves 42 are respectively arranged at both ends of the copper outer shell 41; the first aluminum sleeve 42 and the transition aluminum tube 2 are connected by a welding process. The connecting sleeve in the prior art is a copper outer shell, and the high-voltage cable joint needs to install the copper outer shell 41. Currently, the conventional copper outer shell is made of copper and cannot be directly welded to the transition aluminum tube 2 by laser welding; in this embodiment, the existing copper outer shell is replaced with a copper-aluminum transition copper outer shell 4, and the purpose is to make the materials at both ends of the copper outer shell 41 be the first aluminum sleeves 42 made of aluminum, which is convenient for welding with the transition aluminum tube 2. Through the laser welding process, the connection and sealing between the copper-aluminum transition copper outer shell 4 of the high-voltage cable joint and the cable metal bellows 1 are realized. The copper outer shell 41 and the first aluminum sleeve 42 are welded and fixed by brazing or friction welding to form a copper-aluminum transition copper outer shell 4.

[0052] See Figures 1-7 , in the connecting device, the laser welding position is set at the first peak 11 position of the cable metal bellows 1, and there is a certain distance from the cable outer shielding layer, avoiding the situation of scalding the cable. The aluminum spacer 3 and the first trough 12 of the cable metal bellows 1 are hermetically connected by a soldering process. The melting point of the solder is low, avoiding scalding the cable due to the too high temperature of the first trough 12 of the cable metal bellows 1.

[0053] See Figures 1-8 , the cable metal bellows 1 is a component of the cable and a layer structure of the cable. The main structure of the cable from the inside to the outside is a copper conductor, a conductor shielding layer, an insulating layer, an insulating shielding layer, a water blocking tape, the cable metal bellows 1 and an outer sheath. The function of the cable metal bellows 1 is to provide a path for the capacitive current and fault current of the cable, and at the same time play a mechanical protection role. The copper-aluminum transition copper outer shell 4 is a component of the high-voltage cable joint, used to connect the cable metal bellows 1 at both ends of the cable, provide a path for the capacitive current and fault current, and can lead to ground at the copper outer shell 41 to discharge the induced voltage on the cable metal bellows 1. At the same time, it plays a mechanical protection role.

[0054] See Figures 1-4 , the working principle of the connecting device of the above-mentioned high-voltage cable accessory connecting sleeve and the cable metal bellows is:

[0055] The connecting sleeve is a copper-aluminum transition connecting sleeve, and the connecting device is a transition aluminum component, so that the copper-aluminum transition connecting sleeve and the transition aluminum component have the same aluminum material, and the cable aluminum bellows also has the same aluminum material. The transition aluminum component and the cable metal bellows 1, and the copper-aluminum transition connecting sleeve and the transition aluminum component are connected by a welding process, achieving a high-seal connection and improving the connection quality between the connecting sleeve and the cable metal bellows 1. Through the above settings, the current-carrying capacity, mechanical strength, and sealing ability are greatly improved.

[0056] See Figures 1-8 , the method for connecting the connecting sleeve of the high-voltage cable accessory and the cable metal bellows includes the following steps:

[0057] (1) Design (machine out) a transition aluminum tube 2 with a length (about) 150 mm for connecting the cable metal bellows 1 and the connecting sleeve of the high-voltage cable accessory;

[0058] (2) The cable metal bellows 1 is a cable aluminum bellows, and the inner diameter of the transition aluminum tube 2 is (slightly) larger than the outer diameter of the cable metal bellows 1 to facilitate the transition aluminum tube 2 to be sleeved into the cable aluminum bellows;

[0059] (3) A spiral structure 21 is machined on the end face of the transition aluminum tube 2 so that the end face of the transition aluminum tube 2 is a spiral end face for one week, and one week of the end face spiral corresponds to the first wave crest 11 of the cable aluminum bellows;

[0060] (4) Design (machine out) an aluminum spacer 3 to solve the connection of the first wave valley 12 of the cable aluminum bellows. The outer side 31 of the aluminum spacer 3 is designed to be arc-shaped, with a length of about 30 mm and a width of about one pitch of about 25 mm. The inner side 32 of the aluminum spacer 3 is designed in the shape of a second wave crest 321 and two second wave valleys 322;

[0061] (5) The materials of the transition aluminum tube 2 and the aluminum spacer 3 are the same as that of the cable aluminum bellows, which is convenient for welding;

[0062] (6) The end of the transition aluminum tube 2 is connected to the first wave crest 11 of the cable aluminum bellows and the aluminum spacer 3 by a laser welding process;

[0063] (7) The gap around the first wave valley 12 of the aluminum spacer 3 and the cable aluminum bellows is filled with molten tin welding or sealant to ensure sealing;

[0064] (8) Application of on-site portable laser welding technology.

[0065] See Figures 1-8 , this embodiment also discloses a connection process for the connecting sleeve of the high-voltage cable accessory and the cable metal bellows. The connection process is applied to the connecting device, and the connection process includes the following steps: including:

[0066] (1) Slip the transition aluminum tube 2 over the cable metal bellows 1, with the position of the spiral structure 21 of the transition aluminum tube 2 corresponding to the position of the first wave crest 11 of the cable metal bellows 1;

[0067] (2) Then laser-weld the position of the spiral structure 21 of the transition aluminum tube 2 and the position of the first wave crest 11 of the cable metal bellows 1 using a laser welding device;

[0068] (3) Fill the notch 6 with the aluminum spacer 3, and laser-weld the circumferential side 33 of the aluminum spacer 3 to the first wave crest 11 of the cable metal bellows 1 and the transition aluminum tube 2 using a laser welding device; connect or seal the gap between the inner side 32 of the aluminum spacer 3 and the first wave trough 12 of the cable metal bellows 1 using a soldering process;

[0069] (4) Slip the copper-aluminum transition connecting sleeve over the transition aluminum tube 2, and laser-weld the copper-aluminum transition connecting sleeve and the transition aluminum tube 2 using a laser welding device. Example 2

[0070] See Figures 9-10 , the other structures in this example are the same as those in Example 1. The difference is that the high-voltage cable accessory is a high-voltage terminal accessory, the copper-aluminum transition connecting sleeve is a copper-aluminum transition grounding sleeve 5, the copper-aluminum transition grounding sleeve 5 includes a grounding sleeve 51 and a second aluminum sleeve 52 provided at the bottom of the grounding sleeve 51, and the second aluminum sleeve 52 is connected to the transition aluminum tube 2 through a welding process. The connecting sleeve in the prior art is a grounding sleeve, and the current conventional grounding sleeve is made of copper. The grounding sleeve 51 in this example is also made of copper and cannot be directly welded to the transition aluminum tube 2 using a laser welding method. In this example, the existing grounding sleeve is replaced with a copper-aluminum transition grounding sleeve 5, the purpose of which is to make one end of the grounding sleeve 51 be the second aluminum sleeve 52 made of aluminum, facilitating welding with the transition aluminum tube 2, and achieving the connection and sealing between the copper-aluminum transition grounding sleeve 5 of the high-voltage terminal accessory and the cable metal bellows 1 through a laser welding process. A second aluminum sleeve 52 is provided at the bottom of the conventional grounding sleeve, and the grounding sleeve and the second aluminum sleeve 52 are welded and fixed using a brazing or friction welding method to form a copper-aluminum transition grounding sleeve 5.

[0071] The copper-aluminum transition grounding sleeve 5 is a component of the high-voltage terminal accessory. The copper-aluminum transition grounding sleeve 5 is installed at the bottom of the high-voltage terminal accessory, connected to the cable metal bellows 1, and grounded. Example 3

[0072] See Figure 1, other structures in this embodiment are the same as those in Embodiment 1 or 2, the difference lies in the different materials. The metal transition connecting sleeve is a copper-silver transition connecting sleeve; the transition metal component is a transition silver component; the cable metal bellows 1 is a cable silver bellows; the transition silver component and the cable silver bellows are connected by a welding process; the copper-silver transition connecting sleeve and the transition silver component are connected by a welding process. In the above structure, the copper-silver transition connecting sleeve, the transition silver component, and the cable silver bellows all have the same silver material, so that the transition silver component and the cable silver bellows, and the copper-silver transition connecting sleeve and the transition silver component are connected by a welding process, realizing high-sealing connection and improving the connection quality between the connecting sleeve and the cable metal bellows 1. The transition silver component includes a transition silver tube and a silver spacer. When the copper-silver transition connecting sleeve is a copper-silver transition copper outer shell, the copper-silver transition copper outer shell includes a copper outer shell and two first silver sleeves, and their connection relationship and welding process are the same as those in Embodiment 1. When the copper-silver transition connecting sleeve is a copper-silver transition grounding sleeve, the copper-silver transition grounding sleeve includes a grounding sleeve and a second silver sleeve arranged at the bottom of the grounding sleeve, and their connection relationship and welding process are the same as those in Embodiment 2.

[0073] The above is a preferred embodiment of the present invention, but the embodiments of the present invention are not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A connecting device for a high-voltage cable accessory connecting sleeve and a cable metal corrugated tube, wherein the connecting sleeve in the high-voltage cable accessory and the cable metal corrugated tube in the cable are connected via the connecting device, characterized in that: The connecting sleeve is a metal transition connecting sleeve; the connecting device is a transition metal component; the material of the transition metal component is the same as that of the cable metal corrugated tube; the transition metal component and the cable metal corrugated tube are connected by a welding process; part of the material of the metal transition connecting sleeve is the same as that of the transition metal component, and the metal transition connecting sleeve and the transition metal component are connected by a welding process; wherein the metal transition connecting sleeve is a copper-aluminum transition connecting sleeve; the transition metal component is a transition aluminum component; the cable metal corrugated tube is a cable aluminum corrugated tube; The cable metal corrugated tube is a spiral-shaped cable metal corrugated tube, and the transition aluminum component includes a transition aluminum tube and an aluminum pad; the transition aluminum tube is sleeved on the cable metal corrugated tube, and there is a gap between the transition aluminum tube and the cable metal corrugated tube, and the aluminum pad is arranged on the gap, the transition aluminum tube and the cable metal corrugated tube are connected by a welding process, the aluminum pad is connected to the transition aluminum tube and the cable metal corrugated tube by a welding process, and the copper-aluminum transition connecting sleeve is connected to the transition aluminum tube by a welding process; The cable metal corrugated tube has a first wave crest and a first wave trough; one end of the transition aluminum tube is provided with a spiral structure, and the pitch of the spiral structure is the same as the pitch of the first wave crest of the cable metal corrugated tube; the spiral structure position of the transition aluminum tube is connected to the first wave crest position of the cable metal corrugated tube by a welding process; the above-mentioned gap is formed between the first wave trough of the cable metal corrugated tube and the transition aluminum tube; the end face of one end of the transition aluminum tube is a spiral end face, and the starting and ending positions of the spiral end face are connected by a straight face, and the spiral end face forms the spiral structure; the spiral end face corresponds to the first wave crest position of the cable metal corrugated tube.

2. The connection device according to claim 1, characterized in that: The outer side of the aluminum pad is arc-shaped, and the inner side of the aluminum pad is provided with a corrugated structure, the corrugated structure includes a second wave crest and second wave valleys arranged on both sides of the second wave crest, the wave pitch of the second wave valley of the corrugated structure is the same as the wave pitch of the first wave valley of the cable metal corrugated tube; the arc diameter of the aluminum pad is the same as the diameter of the transition aluminum tube.

3. The connection device according to claim 2, characterized in that: The circumferential side of the aluminum pad is connected to the first wave peak of the cable metal corrugated tube and the transition aluminum tube through a laser welding process; the inner side of the aluminum pad is connected to the first wave valley of the cable metal corrugated tube through a soldering process or by filling the gap with sealant; the spiral structure position of the transition aluminum tube is connected to the first wave peak position of the cable metal corrugated tube through a laser welding process.

4. The connection device according to claim 3, characterized in that: The inner diameter of the transition aluminum tube is greater than the outer diameter of the first wave peak of the cable metal corrugated tube.

5. The connection device according to claim 4, characterized in that: The thickness of the transition aluminum tube is greater than the thickness of the cable metal corrugated tube.

6. The connection device according to claim 1, characterized in that: The high-voltage cable accessory is a high-voltage cable intermediate joint, and the copper-aluminum transition connecting sleeve is a copper-aluminum transition copper shell; the copper-aluminum transition copper shell includes a copper shell and a first aluminum sleeve arranged at both ends of the copper shell; the first aluminum sleeve is connected to the transition aluminum tube by a welding process.

7. The connection device according to claim 1, characterized in that: The high-voltage cable accessory is a high-voltage terminal accessory, the copper-aluminum transition connection sleeve is a copper-aluminum transition grounding sleeve, the copper-aluminum transition grounding sleeve includes a grounding sleeve and a second aluminum sleeve arranged at the bottom of the grounding sleeve, and the second aluminum sleeve is connected to the transition aluminum tube by a welding process.

8. A process for connecting a high-voltage cable accessory connection sleeve with a cable metal corrugated pipe, characterized in that: The connection process is applied to the connection device according to any one of claims 3 to 5, and the connection process comprises the following steps: (1) Sleeve the transition aluminum tube onto the cable metal corrugated tube, wherein the spiral structure position of the transition aluminum tube corresponds to the first wave crest position of the cable metal corrugated tube; (2) Then the spiral structure position of the transition aluminum tube and the first wave peak position of the cable metal corrugated tube are laser welded by laser welding equipment; (3) Filling the notch with an aluminum pad, laser welding the circumference of the aluminum pad to the first wave crest of the cable metal corrugated tube and the transition aluminum tube by laser welding equipment; connecting the inner side of the aluminum pad to the first wave valley of the cable metal corrugated tube by soldering or filling the gap with sealant; (4) The copper-aluminum transition connection sleeve is installed on the transition aluminum tube, and the copper-aluminum transition connection sleeve and the transition aluminum tube are laser welded by laser welding equipment.

Images