Device and process for connecting high-voltage cable accessory connecting sleeve and cable metal corrugated pipe

Abstract

The invention discloses a connecting device and process for a high-voltage cable accessory connecting sleeve and a cable metal corrugated pipe, and relates to the technical field of power cables, the connecting sleeve is connected with the cable metal corrugated pipe through the connecting device, and the connecting sleeve is a metal transition connecting sleeve; the connecting device is a transition metal assembly; the material of the transition metal assembly is the same as that of the cable metal corrugated pipe; the transition metal assembly and the cable metal corrugated pipe are connected through a welding process; partial material of the metal transition connecting sleeve is the same as that of the transition metal assembly, and the metal transition connecting sleeve is connected with the transition metal assembly through a welding process; the metal transition connecting sleeve is a copper-aluminum transition connecting sleeve; the transition metal assembly is a transition aluminum assembly; the cable metal corrugated pipe is a cable aluminum corrugated pipe. The connecting device solves the problems that the quality of the existing lead coating connecting process is greatly influenced by factors of constructors and the cable is easily scalded, and the connecting sleeve and the cable metal corrugated pipe are stably connected, so that the connecting quality is high.

Description

Technical Field

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

[0002] High-voltage cable accessories (also called 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 accessories and the cable metal corrugated tube in the cable, and the connection between the grounding sleeve in the high-voltage terminal accessories and the cable metal corrugated tube in the cable, are mostly connected by lead plating. The copper shell and the grounding sleeve can be called a connecting sleeve.

[0003] The existing lead-plating process is as follows: first, preheat the lead-plated positions of the connecting sleeves and the cable metal bellows in the high-voltage cable accessories, then use lead bars and tin bars to prime the lead-plated positions of the connecting sleeves and the cable metal bellows in the high-voltage cable accessories, respectively, and finally apply the heated and molten lead bars to the connecting sleeves and the cable metal bellows in the high-voltage cable accessories, and press them tightly, with an apple-shaped appearance. However, the quality of the existing lead-plating process cannot meet the needs of long-term safe and reliable operation, and the quality problems of lead-plating cause about 40% of cable failures. The existing lead-plating process has the following shortcomings: 1. Before lead plating, the connecting sleeves and cable metal bellows in the high-voltage cable accessories need to be preheated. At the same time, the temperature of the lead bar after melting is about 250°C, which may burn the outer shielding layer of the cable, resulting in breakdown of the burned part after several years.

[0004] 2. If the asphalt on the surface of the cable metal corrugated tube is not cleaned thoroughly or the primer is not fully supplemented, it is easy to cause the lead lining to be loose, false connection or falling off, causing the lead lining to heat up and cause failure.

[0005] 3. The quality of the lead-plating process is mainly controlled by the construction personnel and is greatly affected by human factors. If the quality of the lead-plating does not meet the standards, if the lead-plating is uneven and there are pores inside, it will lead to loosening, cracking and other defects over time. Summary of the invention

[0006] The purpose of the present invention is to overcome the above-mentioned problems and provide a connecting device for a high-voltage cable accessory connecting sleeve and a cable metal bellows. The connecting device solves the problem that the quality of the existing lead-plated connection process is greatly affected by the construction personnel and the cable is easily burned. The connection between the connecting sleeve and the cable metal bellows is stable and the connection quality is high.

[0007] Another object of the present invention is to provide a connection process between a high-voltage cable accessory connecting sleeve and a cable metal bellows.

[0008] The purpose of the present invention is achieved through the following technical solutions: A connecting device for a high-voltage cable accessory connecting sleeve and a cable metal bellows, wherein the connecting sleeve in the high-voltage cable accessory and the cable metal bellows in the cable are connected via 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; the transition metal component and the cable metal bellows are connected via 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 via 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; and the cable metal bellows is a cable aluminum bellows.

[0009] The working principle of the connection device between the above-mentioned high-voltage cable accessory connection sleeve and the cable metal bellows is: The copper-aluminum transition sleeve, transition aluminum component, and cable aluminum bellows are all made of the same aluminum material. Compared with copper and silver, aluminum has a lower cost. By using the same aluminum material, the transition aluminum component and the cable aluminum bellows, and the copper-aluminum transition sleeve and the transition aluminum component can be connected by welding process, achieving a high-sealing connection and improving the connection quality between the sleeve and the cable metal bellows.

[0010] Preferably, the cable metal bellows is a spiral-shaped cable metal bellows, and the transition aluminum component includes a transition aluminum tube and an aluminum pad; the transition aluminum tube is sleeved on the cable metal bellows, and there is a gap between the transition aluminum tube and the cable metal bellows, and the aluminum pad is arranged on the gap, the transition aluminum tube and the cable metal bellows are connected by a welding process, the aluminum pad is connected to the transition aluminum tube and the cable metal bellows by a welding process, and the copper-aluminum transition connecting sleeve is connected to the transition aluminum tube by a welding process. In the above structure, since the cable metal bellows is a spiral-shaped cable metal bellows, there will be a gap after the transition aluminum tube is sleeved on the cable metal bellows, and the aluminum pad fills the gap to achieve a sealed connection and improve the connection quality.

[0011] 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 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 is connected to the position of the first wave crest of the cable metal bellows by a welding process; the above-mentioned gap 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 spiral end face, and the spiral end face forms the 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, so that the spiral end face can correspond to the first wave crest position of the cable metal bellows, so that the spiral structure position can be connected to the first wave crest position of the cable metal bellows by a welding process, thereby improving the sealing of the connection. After welding, there is a gap at the first wave trough position, and the aluminum pad can fill the gap.

[0012] Preferably, the outer side of the aluminum pad is in an arc shape, 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, and 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. By setting the above structure, the aluminum pad is easy to fill the gap, and is convenient to cooperate with the transition aluminum tube and the cable metal corrugated tube to improve the connection quality and make the structure more compact.

[0013] Preferably, the circumference of the aluminum pad is connected to the first wave crest of the cable metal corrugated tube and the transition aluminum tube by laser welding; the inner side of the aluminum pad is connected to the first wave valley of the cable metal corrugated tube by soldering or by filling the gap with sealant; the spiral structure position of the transition aluminum tube is connected to the first wave crest position of the cable metal corrugated tube by laser welding. The use of laser welding and soldering makes the connection more reliable, will not burn the cable, and has the characteristics of high sealing and mechanical strength.

[0014] Preferably, the inner diameter of the transition aluminum tube is larger than the outer diameter of the first wave crest of the cable metal corrugated tube, so as to facilitate the sleeve of the transition aluminum tube on the cable metal corrugated tube and improve the installation convenience.

[0015] Furthermore, the inner diameter of the transition aluminum tube is 1 mm to 2 mm larger than the outer diameter of the first wave peak of the cable metal corrugated tube. 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 corrugated tube will be larger, making welding difficult and reducing the sealing performance.

[0016] Preferably, the thickness of the transition aluminum tube is greater than the thickness of the cable metal bellows. In order to ensure the flow of the transition aluminum tube, the thickness of the transition aluminum tube should not be less than the thickness of the cable metal bellows. If the thickness is less than the thickness of the cable metal bellows, that is, the flow is less than the cable metal bellows, it is easy to cause heating. At the same time, the thickness cannot be too thick. The thicker the thickness, the greater 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 the thickness of the cable metal bellows. For example, the thickness of the transition aluminum tube is 1 mm greater than the thickness of the cable metal bellows.

[0017] Preferably, 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.

[0018] 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 arranged at the bottom of the grounding sleeve, and the second aluminum sleeve is connected to the transition aluminum tube by a welding process.

[0019] A connection process for a high-voltage cable accessory connection sleeve and a cable metal corrugated pipe, the connection process is applied to a connection device, 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.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. The connecting device of the present invention provides a reliable and safe connection method for connecting the connecting sleeve in the high-voltage cable accessory and the cable metal bellows in the cable.

[0021] 2. The connecting device, the copper-aluminum transition connecting sleeve, the transition aluminum component, and the cable aluminum bellows in the present invention are all made of the same aluminum material, so that the transition aluminum component and the cable metal bellows, and the copper-aluminum transition connecting sleeve and the transition aluminum component can be connected by welding process, which solves the problem that the quality of the existing lead-enameled connection process is greatly affected by construction personnel factors and is easy to burn 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 and the connection quality is high; the product quality of high-voltage cable accessories is further improved, and the related power outage losses and negative impacts caused by unreliable grounding connection failures of high-voltage cable accessories are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic structural diagram of a connection device in the present invention after connecting a connection sleeve of one embodiment to a metal corrugated tube of a cable.

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure after the connection device of the present invention is connected to the metal corrugated tube of the cable.

[0024] Figure 3 It is a schematic diagram of the partial three-dimensional structure after the connection device of the present invention is connected to the metal corrugated tube of the cable.

[0025] Figure 4 It is a schematic diagram of the local structure after the connection device of the present invention is connected to the metal corrugated tube of the cable.

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the transition aluminum tube in the present invention.

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure of the aluminum pad in the present invention.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the aluminum pad in the present invention at different viewing angles.

[0029] Figure 8 It is a cross-sectional view of the copper-aluminum transition copper shell in the present invention.

[0030] Fig. 9 This is a schematic structural diagram of a connection device in the present invention that connects a connection sleeve of another embodiment to a cable metal corrugated tube.

[0031] Fig.10 It is a cross-sectional view of the copper-aluminum transition ground sleeve in the present invention. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto. Example 1

[0033] See also Figure 1-Figure 4 This embodiment discloses a connection device between a high-voltage cable accessory connection sleeve and a cable metal bellows, which solves the problems of cable burns and difficulty in quality control in the current lead-plating process. The connection sleeve in the high-voltage cable accessory is connected to the cable metal bellows 1 in the cable through a connection device, wherein 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 1; the transition metal component and the cable metal bellows 1 are connected by 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 by a welding process.

[0034] See also Figure 1-Figure 4 , the metal transition sleeve is a copper-aluminum transition 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 welding; the copper-aluminum transition sleeve and the transition aluminum component are connected by welding. In the above structure, the copper-aluminum transition sleeve, the transition aluminum component, and the cable aluminum bellows are all made of the same aluminum material, so that the transition aluminum component and the cable aluminum bellows, and the copper-aluminum transition sleeve and the transition aluminum component are connected by welding, achieving a high sealing connection and improving the connection quality between the sleeve and the cable metal bellows 1.

[0035] See also Figure 1-Figure 7 , the cable metal bellows 1 (cable aluminum bellows) is a spiral-shaped cable metal bellows 1 (cable aluminum bellows), the transition aluminum component includes a transition aluminum tube 2 and an aluminum pad 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 pad 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 pad 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 is connected to the transition aluminum tube 2 by a welding process. In the above structure, since the cable metal bellows 1 is a spiral-shaped 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 pad 3 fills the gap 6 to achieve a sealed connection and improve the connection quality.

[0036] See also Figure 1-Figure 7The cable metal corrugated tube 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 spiral structure 21, and the pitch of the spiral structure 21 is the same as the pitch of the first wave crest 11 of the cable metal corrugated tube 1; 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 corrugated tube 1 through a welding process; the above-mentioned gap 6 is formed between the first wave trough 12 of the cable metal corrugated tube 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 spiral end face, that is, the end face spirals 360°, and the starting and ending 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 pitch of the first wave peak 11 of the cable metal bellows 1, so that the spiral end face can correspond to the position of the first wave peak 11 of the cable metal bellows 1, so that the position of the spiral structure 21 can be connected to the position of the first wave peak 11 of the cable metal bellows 1 through a welding process, thereby improving the sealing of the connection. After welding, there is a gap 6 at the position of the first wave valley 12, and the aluminum pad 3 can fill the gap 6.

[0037] See also Figure 1-Figure 7 The cable metal corrugated tube 1 is a cable aluminum corrugated tube. The transition aluminum tube 2 is made of the same material as the cable metal corrugated tube 1. The transition aluminum tube 2 is cylindrical and has a length of about 100 mm (the length can be flexibly adjusted according to actual conditions). The aluminum pad 3 is made of the same material as the cable metal corrugated tube 1; the length of the aluminum pad 3 is about 30 mm, and the width is equal to the wave pitch of the cable metal corrugated tube 1. The wave pitch of the cable metal corrugated tube 1 is the wave pitch of the first wave crest 11 or the first wave trough 12 of the cable metal corrugated tube 1.

[0038] See also Figure 1-Figure 7 The outer side 31 of the aluminum pad 3 is in an arc shape, and the inner side 32 of the aluminum pad 3 is provided with a corrugated structure, which includes a second wave crest 321 and second wave valleys 322 arranged on both sides of the second wave crest 321. The wave pitch of the second wave valley 322 of the corrugated structure is the same as the wave pitch of the first wave valley 12 (or the wave pitch of the first wave crest 11) of the cable metal corrugated tube 1; the arc diameter of the aluminum pad 3 is the same as the diameter of the transition aluminum tube 2. By setting the above structure, the aluminum pad 3 is easy to fill the gap 6, and is convenient to cooperate with the transition aluminum tube 2 and the cable metal corrugated tube 1 to improve the connection quality and make the structure more compact.

[0039] See also Figure 1-Figure 7The peripheral side 33 of the aluminum pad 3 is connected to the first wave crest 11 of the cable metal corrugated tube 1 and the transition aluminum tube 2 by laser welding; the inner side 32 of the aluminum pad 3 is connected to the first wave valley 12 of the cable metal corrugated tube 1 by soldering; the spiral structure 21 of the transition aluminum tube 2 is connected to the first wave crest 11 of the cable metal corrugated tube 1 by laser welding. The laser welding process and the soldering process make the connection more reliable, will not burn the cable, and have the characteristics of high sealing and mechanical strength. When connected, the second wave crest 321 cooperates with the first wave valley 12 to improve the sealing and compactness of the structure.

[0040] See also Figure 1-Figure 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 corrugated tube 1. The purpose is to facilitate the transition aluminum tube 2 to be sleeved on the cable metal corrugated tube 1 and improve the convenience of installation.

[0041] See also Figure 1-Figure 7 The inner diameter of the transition aluminum tube 2 is 1 mm to 2 mm larger than the outer diameter of the first wave crest 11 of the cable metal corrugated tube 1. 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 corrugated tube 1 will be larger, making welding difficult and reducing the sealing performance.

[0042] See also Figure 1-Figure 7 , the thickness of the transition aluminum tube 2 is greater than the thickness of the cable metal bellows 1. In order to ensure the flow 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 flow is less than the cable metal bellows 1, it is easy to cause heating. At the same time, the thickness should not be too thick. The thicker the thickness, the greater 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 2 is slightly greater than the thickness of the cable metal bellows 1. For example, the thickness of the transition aluminum tube 2 is 1 mm greater than the thickness of the cable metal bellows 1.

[0043] See also Figure 1-Figure 8, the high-voltage cable accessory is a high-voltage cable intermediate joint, the copper-aluminum transition connection sleeve is a copper-aluminum transition copper shell 4; the copper-aluminum transition copper shell 4 includes a copper shell 41 and two first aluminum sleeves 42, and the two first aluminum sleeves 42 are respectively arranged at both ends of the copper shell 41; the first aluminum sleeve 42 is connected to the transition aluminum tube 2 by a welding process. The connection sleeve in the prior art is a copper shell, and the high-voltage cable intermediate joint needs to be installed with a copper shell 41. At present, the conventional copper shell is made of copper and cannot be directly welded and connected with the transition aluminum tube 2 by laser welding; this embodiment replaces the existing copper shell with a copper-aluminum transition copper shell 4, and its purpose is to make the first aluminum sleeve 42 made of aluminum at both ends of the copper shell 41 easy to weld with the transition aluminum tube 2, and realize the connection and sealing between the copper-aluminum transition copper shell 4 of the high-voltage cable intermediate joint and the cable metal corrugated tube 1 by laser welding. The copper shell 41 and the first aluminum sleeve 42 are welded and fixed by brazing or friction welding to form a copper-aluminum transition copper shell 4.

[0044] See also Figure 1-Figure 7 The laser welding position of the connection device is set at the first wave crest 11 of the cable metal corrugated tube 1, which is at a certain distance from the outer shielding layer of the cable to avoid scalding the cable. The aluminum pad 3 and the first wave valley 12 of the cable metal corrugated tube 1 are sealed and connected by soldering process. The solder has a low melting point, which avoids scalding the cable due to the overhigh temperature of the first wave valley 12 of the cable metal corrugated tube 1.

[0045] See also Figure 1-Figure 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 the copper conductor, the conductor shielding layer, the insulating layer, the insulating shielding layer, the water blocking tape, the cable metal bellows 1 and the outer sheath. The function of the cable metal bellows 1 is to provide a path for the capacitive current and the fault current for the cable, and at the same time play a mechanical protection role. The copper-aluminum transition copper shell 4 is a component of the middle joint of the high-voltage cable, which is used to connect the cable metal bellows 1 of the cables at both ends, provide a path for the capacitive current and the fault current, and can be grounded in the copper shell 41 to unload the induced voltage on the cable metal bellows 1. At the same time, it plays a mechanical protection role.

[0046] See also Figure 1-Figure 4 The working principle of the connection device between the above-mentioned high-voltage cable accessory connection sleeve and the cable metal bellows is: 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 corrugated tube also has the same aluminum material, so that the transition aluminum component and the cable metal corrugated tube 1, and the copper-aluminum transition connecting sleeve and the transition aluminum component are connected through a welding process, achieving a high sealing connection and improving the connection quality between the connecting sleeve and the cable metal corrugated tube 1. Through the above settings, the flow capacity, mechanical strength, and sealing ability are greatly improved.

[0047] See also Figure 1-Figure 8 The method of connecting the high-voltage cable accessory connecting sleeve and the cable metal bellows includes the following steps: (1) Design (process) a transition aluminum tube 2 with a length (approximately) 150 mm, which is used to connect the cable metal corrugated tube 1 and the connecting sleeve of the high-voltage cable accessories; (2) The cable metal corrugated tube 1 is a cable aluminum corrugated tube, and the inner diameter of the transition aluminum tube 2 is (slightly) larger than the outer diameter of the cable metal corrugated tube 1, so that the transition aluminum tube 2 can be easily inserted into the cable aluminum corrugated tube; (3) A spiral structure 21 is processed 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, and one spiral end face corresponds to the first wave peak 11 of the cable aluminum corrugated tube; (4) Design (process) an aluminum spacer 3 to solve the connection of the first wave valley 12 of the cable aluminum corrugated tube. The surface of the outer side 31 of the aluminum spacer 3 is designed to be an arc shape with a length of about 30 mm and a width of about a pitch of about 25 mm. The surface of the inner side 32 of the aluminum spacer 3 is designed to be in the shape of a second wave peak 321 and two second wave valleys 322; (5) The materials of the transition aluminum tube 2 and the aluminum spacer 3 are the same as those of the cable aluminum corrugated tube, which is convenient for welding; (6) The end of the transition aluminum tube 2 is connected to the first wave crest 11 of the cable aluminum corrugated tube and the aluminum spacer 3 by laser welding; (7) The gap between the aluminum spacer 3 and the first wave valley 12 of the cable aluminum corrugated tube is filled with molten tin welding or sealant to ensure sealing; (8) Application of on-site portable laser welding technology.

[0048] See also Figure 1-Figure 8 This embodiment also discloses a connection process between a high-voltage cable accessory connection sleeve and a cable metal corrugated tube, the connection process is applied to a connection device, and the connection process includes the following steps: (1) The transition aluminum tube 2 is put on the cable metal corrugated tube 1, and the position of the spiral structure 21 of the transition aluminum tube 2 corresponds to the position of the first wave peak 11 of the cable metal corrugated tube 1; (2) Then the spiral structure 21 of the transition aluminum tube 2 and the first wave crest 11 of the cable metal corrugated tube 1 are laser welded by laser welding equipment; (3) Fill the aluminum pad 3 on the gap 6, and laser weld the peripheral side 33 of the aluminum pad 3 to the first wave crest 11 of the cable metal corrugated tube 1 and the transition aluminum tube 2 by laser welding equipment; connect the inner side 32 of the aluminum pad 3 to the first wave valley 12 of the cable metal corrugated tube 1 by soldering or fill the gap with sealant to connect; (4) The copper-aluminum transition connection sleeve is installed on the transition aluminum tube 2, and the copper-aluminum transition connection sleeve and the transition aluminum tube 2 are laser welded by laser welding equipment. Example 2

[0049] See also Figure 9-10 , the other structures in this embodiment are the same as those in embodiment 1, except 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 5, the copper-aluminum transition grounding sleeve 5 includes a grounding sleeve 51 and a second aluminum sleeve 52 arranged at the bottom of the grounding sleeve 51, and the second aluminum sleeve 52 is connected to the transition aluminum tube 2 by a welding process. The connection sleeve in the prior art is a grounding sleeve. The conventional grounding sleeve is currently made of copper. The grounding sleeve 51 of this embodiment is also made of copper, and it is impossible to directly weld and connect with the transition aluminum tube 2 by laser welding. In this embodiment, the existing grounding sleeve is replaced with a copper-aluminum transition grounding sleeve 5, the purpose of which is to make the second aluminum sleeve 52, which is made of aluminum at one end of the grounding sleeve 51, easy to weld with the transition aluminum tube 2, and realize the connection and sealing between the copper-aluminum transition grounding sleeve 5 of the high-voltage terminal accessory and the cable metal corrugated tube 1 by laser welding. The second aluminum sleeve 52 is set at the bottom of the conventional grounding sleeve, and the grounding sleeve and the second aluminum sleeve 52 are welded and fixed by brazing or friction welding to form a copper-aluminum transition grounding sleeve 5.

[0050] The copper-aluminum transition grounding sleeve 5 is a component of the high-voltage terminal accessories. The copper-aluminum transition grounding sleeve 5 is installed at the bottom of the high-voltage terminal accessories, connected to the cable metal corrugated tube 1, and led out for grounding. Example 3

[0051] See also Figure 1, the other structures in this embodiment are the same as those in Embodiment 1 or 2, except that the materials are different, the metal transition connection sleeve is a copper-silver transition connection sleeve; the transition metal component is a transition silver component; the cable metal bellows 1 is a cable silver bellows; the transition silver component is connected to the cable silver bellows by a welding process; the copper-silver transition connection sleeve is connected to the transition silver component by a welding process. In the above structure, the copper-silver transition connection sleeve, the transition silver component, and the cable silver bellows are all made of the same silver material, so that the transition silver component and the cable silver bellows, and the copper-silver transition connection sleeve and the transition silver component are connected by a welding process, achieving a high sealing connection and improving the connection quality between the connection sleeve and the cable metal bellows 1. The transition silver component includes a transition silver tube and a silver pad. When the copper-silver transition connection sleeve is a copper-silver transition copper shell, the copper-silver transition copper shell includes a copper 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 the connection relationship and welding process are the same as those in Example 2.

[0052] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are 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; and the cable metal corrugated tube is a cable aluminum corrugated tube.

2. The connection device according to claim 1, characterized in that: The cable metal bellows is a spiral-shaped cable metal bellows, and the transition aluminum component includes a transition aluminum tube and an aluminum pad; the transition aluminum tube is sleeved on the cable metal bellows, and there is a gap between the transition aluminum tube and the cable metal bellows, and the aluminum pad is arranged on the gap, the transition aluminum tube and the cable metal bellows are connected by a welding process, the aluminum pad is connected to the transition aluminum tube and the cable metal bellows by a welding process, and the copper-aluminum transition connecting sleeve is connected to the transition aluminum tube by a welding process.

3. The connection device according to claim 2, characterized in that: 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 through 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.

4. The connection device according to claim 3, 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.

5. The connection device according to claim 4, 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.

6. The connection device according to claim 5, 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.

7. The connection device according to claim 6, characterized in that: The thickness of the transition aluminum tube is greater than the thickness of the cable metal corrugated tube.

8. The connection device according to claim 3, 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.

9. The connection device according to claim 3, 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.

10. 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 5 to 7, 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.

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