Power cable crimping joint with insulation sleeve for building

Abstract

The utility model relates to a power cable crimping joint, in particular to a power cable crimping joint with an insulating sleeve for a building. The objective of the utility model is to solve the problem of poor reliability of the existing crimping pipe connecting cable joint. The utility model relates to a building power cable crimping joint with an insulation sleeve. The building power cable crimping joint is composed of a metal connecting pipe and an insulation pipe. Welding holes and heat dissipation holes are annularly formed in the two ends of the metal connecting pipe, a first pressing block and a second pressing block are arranged on the inner wall of the metal connecting pipe, a soldering tin groove is formed between the first pressing block and the second pressing block, and soldering tin is arranged in the soldering tin groove; the metal connecting pipe is sleeved with the insulating pipe, the inner circular ring in the middle of the metal connecting pipe is sleeved with the outer circular ring in the insulating pipe, and the outer circular ring and the inner circular ring are in threaded connection; the insulating tube is longer than the metal connecting tube. According to the power cable crimping joint with the insulation sleeve for the building, the use amount of the insulation rubber tape is reduced, the installation efficiency is high, the integrity is good, and the sealing effect is good. The connector is good in heat dissipation performance and high in reliability.

Description

Technical Field

[0001] The utility model relates to a crimping joint for a power cable used in buildings. Background Art

[0002] With the development of cities and the increase in energy demand, more and more cables are used in the transmission lines of buildings, such as temporary power installation during construction or maintenance, and long-term formal power use in the building system for production and life after the construction is completed. Cables operate in a complex environment with multiple factors such as electromagnetic, thermal, and force. Among them, heat is the main cause of cable failure, affecting the safety of the building and construction.

[0003] The current carrying capacity design of cross-linked polyethylene cable lines is based on the maximum tolerable temperature of cross-linked polyethylene insulation. Exceeding the maximum operating temperature is likely to cause cable breakdown failure, posing a threat to the safety and stability of the power grid. In most theoretical cases, the current carrying capacity of the cable line is determined by the cable body and does not depend on other parts such as cable joints. However, actual operating experience shows that cable joints are often hot spots in the line, limiting the improvement of the current carrying capacity of the cable line. Although efforts are made to avoid abnormal heating caused by defects during the design, manufacture and installation of cable joints, this is not possible to completely eliminate it. Poor crimping process, deterioration of insulation materials and other factors can cause overheating failures in cable joints. Especially under high-load operating conditions, overheating of cable joints will be more prominent. Long-term overheating operation will not only accelerate insulation aging and shorten service life, but also cause explosions and fires in severe cases, thus reducing reliability.

[0004] Cable joints are usually connected by crimping tubes at both ends. The difference between the heat generated inside the cable joint and the heat dissipation of the crimping tube is the main reason why the cable joint becomes the hot spot of the line. The use of crimping tubes will inevitably introduce contact resistance, causing the cable joint to generate additional Joule heat than the body. Therefore, the use of existing crimping tubes to connect cable joints has the problem of poor reliability. Utility Model Content

[0005] The utility model provides a building power cable crimping joint with an insulating sleeve in order to solve the problem of poor reliability of the existing crimping tube connecting cable joint.

[0006] The utility model discloses a power cable crimping joint with an insulating sleeve for use in buildings, which is composed of a metal connecting tube and an insulating tube.

[0007] The metal connecting tube is a round tube, an inner ring is sleeved and fixedly connected to the middle of the outer wall of the metal connecting tube, welding holes are circumferentially arranged at both ends of the metal connecting tube, and heat dissipation holes are arranged on the inner side of the welding holes, and the heat dissipation holes are sealed by aluminum foil tape; a first pressing block and a second pressing block are arranged on the inner wall of the metal connecting tube in an annular array, and the second pressing block is arranged on the inner wall of the metal connecting tube in an annular array, each column of the first pressing block and each column of the second pressing block are arranged at intervals, and the first pressing blocks and the second pressing blocks in adjacent columns are staggered, and a solder groove is arranged between the first pressing block and the second pressing block, and solder is arranged in the solder groove;

[0008] The insulating tube is a round tube, a round groove is arranged at the center of the inner wall of the insulating tube, and an outer round ring is fixed in the round groove;

[0009] The insulating tube is sleeved on the outside of the metal connecting tube, the outer ring in the insulating tube is sleeved on the inner ring in the middle of the metal connecting tube, and the outer ring and the inner ring are threadedly connected; the length of the insulating tube is greater than that of the metal connecting tube.

[0010] The principle and beneficial effects of the utility model are:

[0011] The utility model discloses a power cable crimping joint with an insulating sleeve for building, in which an outer ring is embedded in the middle of the inner wall of an insulating tube, and the outer ring and the inner ring are connected by threads. After the metal connecting tube is crimped to the joint, the outer ring and the inner ring are directly connected and the two ends of the insulating tube are sealed with insulating tape to realize the insulation sealing of the joint. Compared with the existing joints that are all sealed with insulating tape, the use of the insulating tube reduces the amount of insulating tape used, has high installation efficiency, good integrity and good sealing effect.

[0012] In the utility model, the first pressing block and the second pressing block are staggered and the inner end faces are arc-shaped surfaces, which can not only compress the joint to improve the reliability of the joint, but also the gap between the first pressing block and the second pressing block is connected and connected to the heat dissipation hole. The heat dissipation hole is sealed by aluminum foil tape, which can provide a certain heat dissipation space or heat dissipation channel, avoid local heat concentration, improve the heat dissipation of the joint, and then improve the reliability, ensuring the smooth progress of the construction or maintenance process and the safety of long-term use.

[0013] In the utility model, solder is placed in advance in the solder tank, and after crimping, the metal connecting tube is heated to melt the solder and weld the joint core wire, as well as fill the gap. At the same time, the welding hole is used to weld the metal connecting tube and the joint core wire after the joint is crimped, thereby further ensuring the reliability and current carrying capacity of the joint connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of a power cable crimping joint with an insulating sleeve for construction;

[0015] Figure 2 It is a structural schematic diagram of a metal connecting pipe 1;

[0016] Figure 3 It is a structural schematic diagram (section) of the metal connecting pipe 1;

[0017] Figure 4 It is a cross-sectional view of the metal connecting pipe 1 at AA;

[0018] Figure 5 It is a left view of the metal connecting pipe 1. DETAILED DESCRIPTION

[0019] The technical solution of the present utility model is not limited to the specific implementation modes listed below, but also includes any reasonable combination of the specific implementation modes.

[0020] Specific implementation method 1: In this implementation method, the power cable crimping joint with an insulating sleeve for construction is composed of a metal connecting tube 1 and an insulating tube 7;

[0021] The metal connecting tube 1 is a round tube, an inner ring 6 is sleeved and fixedly connected in the middle of the outer wall of the metal connecting tube 1, welding holes 2 are circumferentially arranged at both ends of the metal connecting tube 1, and heat dissipation holes 9 are arranged on the inner side of the welding holes 2. The heat dissipation holes 9 are sealed by aluminum foil tape; the inner wall of the metal connecting tube 1 is provided with a first pressing block 3 and a second pressing block 5, the first pressing block 3 is arranged on the inner wall of the metal connecting tube 1 in an annular array, and the second pressing block 5 is arranged on the inner wall of the metal connecting tube 1 in an annular array, each column of the first pressing block 3 and each column of the second pressing block 5 are arranged at intervals, and the first pressing blocks 3 and the second pressing blocks 5 in adjacent columns are staggered, and a solder groove 4 is arranged between the first pressing block 3 and the second pressing block 5, and solder is arranged in the solder groove 4;

[0022] The insulating tube 7 is a round tube, a round groove is arranged at the center of the inner wall of the insulating tube 7, and an outer ring 8 is fixed in the round groove;

[0023] The insulating tube 7 is sleeved on the outside of the metal connecting tube 1, and the outer ring 8 in the insulating tube 7 is sleeved on the inner ring 6 in the middle of the metal connecting tube 1, and the outer ring 8 and the inner ring 6 are threadedly connected; the length of the insulating tube 7 is greater than that of the metal connecting tube 1.

[0024] In the power cable crimping joint with an insulating sleeve for construction in this embodiment, the outer ring 8 is embedded and installed in the middle of the inner wall of the insulating tube 7. The outer ring 8 and the inner ring 6 are threadedly connected. After the metal connecting tube 1 is crimped on the joint, the outer ring 8 and the inner ring 6 are directly connected and the two ends of the insulating tube 7 are sealed with insulating tape to achieve the insulation sealing of the joint. Compared with the existing joints that are all sealed with insulating tape, the use of the insulating tube 7 reduces the amount of insulating tape used, has high installation efficiency, good integrity, and good sealing effect.

[0025] In this embodiment, the first pressing block 3 and the second pressing block 5 are staggered and the inner end faces are arc-shaped surfaces, which can not only compress the joint to improve the reliability of the joint, but also the gap between the first pressing block 3 and the second pressing block 5 is connected and connected to the heat dissipation hole 9. The heat dissipation hole 9 is sealed by aluminum foil tape, which can provide a certain heat dissipation space or heat dissipation channel, improve the heat dissipation of the joint, and thus improve the reliability.

[0026] In this embodiment, solder is pre-placed in the solder groove 4 and after crimping, the metal connecting tube 1 is heated to melt the solder and weld the joint core wire and fill the gap. At the same time, the welding hole 2 is used to weld the metal connecting tube 1 and the joint core wire after the joint is crimped, which further ensures the reliability and current carrying capacity of the joint connection.

[0027] Specific embodiment 2: This embodiment is different from specific embodiment 1 in that the heat dissipation holes 9 are arranged in a circular array at both ends of the metal connecting tube 1, and the heat dissipation holes 9 penetrate the tube wall of the metal connecting tube 1. The heat dissipation holes 9 can improve the heat dissipation of the joint, thereby improving reliability.

[0028] Specific implementation method three: This implementation method is different from specific implementation methods one or two in that: the welding hole 2 is a strip-shaped through hole, and the welding hole 2 is arranged along the circumferential direction of the metal connecting tube 1; the welding hole 2 passes through the tube wall of the metal connecting tube 1. The welding hole 2 is a strip-shaped through hole, and the core wire is connected to the tube wall of the connecting tube 1 by soldering solder to the welding hole 2 after the joint is crimped, which can not only improve the connection reliability between the connecting tube 1 and the core wire, but also fill the core wire with solder, thereby ensuring the current carrying capacity of the joint.

[0029] Specific implementation mode 4: This implementation mode is different from any one of the specific implementation modes 1 to 3 in that the depth of the solder groove 4 does not exceed 50% of the tube wall thickness of the metal connecting tube 1 .

[0030] Specific embodiment 5: This embodiment is different from any one of specific embodiments 1 to 4 in that the length of the insulating tube 7 is 1.5 times that of the metal connecting tube 1. The length of the insulating tube 7 is greater than that of the metal connecting tube 1, so that the insulating tube 7 can completely cover the exposed part of the metal connecting tube 1 and the joint core wire, thereby ensuring the reliability of insulation.

[0031] Specific embodiment 6: This embodiment is different from any one of specific embodiments 1 to 5 in that one end of the first pressing block 3 is fixedly connected to the inner wall of the metal connecting tube 1, and the other end of the first pressing block 3 is an arc-shaped surface. The arc-shaped surface can better fit the shape of the core wire, ensuring that the core wire is fully compressed.

[0032] Specific embodiment 7: This embodiment is different from any one of specific embodiments 1 to 6 in that one end of the second pressing block 5 is fixedly connected to the inner wall of the metal connecting tube 1, and the other end of the second pressing block (5) is an arc-shaped surface. The arc-shaped surface can better fit the shape of the core wire, ensuring that the core wire is fully compressed.

[0033] Embodiment 1:

[0034] Combination Figures 1 to 5 To illustrate this embodiment, Figure 1 It is a schematic diagram of the structure of a power cable crimping joint with an insulating sleeve for construction; Figure 2 It is a structural schematic diagram of a metal connecting pipe 1; Figure 3 It is a cross-sectional view of the structure of the metal connecting pipe 1; Figure 4 It is a cross-sectional view of the metal connecting pipe 1 at AA; Figure 5 It is a left view of the metal connecting tube 1. The power cable crimping joint with an insulating sleeve for construction in this embodiment is composed of a metal connecting tube 1 and an insulating tube 7;

[0035] The metal connecting tube 1 is a round tube, an inner ring 6 is sleeved and fixedly connected to the middle of the outer wall of the metal connecting tube 1, welding holes 2 are circumferentially arranged at both ends of the metal connecting tube 1, the welding holes 2 are strip-shaped through holes, and the welding holes 2 are arranged along the circumferential direction of the metal connecting tube 1; the welding holes 2 pass through the tube wall of the metal connecting tube 1; the inner side of the welding hole 2 is provided with heat dissipation holes 9 at both ends of the metal connecting tube 1, and the heat dissipation holes 9 are arranged in a ring array at both ends of the metal connecting tube 1, and the heat dissipation holes 9 pass through the tube wall of the metal connecting tube 1;

[0036] The heat dissipation hole 9 is sealed by an aluminum foil tape; the inner wall of the metal connecting tube 1 is provided with a first pressing block 3 and a second pressing block 5, the first pressing block 3 is arranged in an annular array on the inner wall of the metal connecting tube 1, and the second pressing block 5 is arranged in an annular array on the inner wall of the metal connecting tube 1, one end of the first pressing block 3 is fixedly connected to the inner wall of the metal connecting tube 1, and the other end of the first pressing block 3 is an arc surface; one end of the second pressing block 5 is fixedly connected to the inner wall of the metal connecting tube 1, and the other end of the first pressing block 3 is an arc surface; each column of the first pressing block 3 and each column of the second pressing block 5 are arranged at intervals, and the first pressing blocks 3 and the second pressing blocks 5 of adjacent columns are staggered, and a solder groove 4 is arranged between the first pressing block 3 and the second pressing block 5, and the depth of the solder groove 4 is 40% of the tube wall thickness of the metal connecting tube 1; solder is arranged in the solder groove 4; the insulating tube 7 is a circular tube, a circular groove is provided at the center of the inner wall of the insulating tube 7, an outer circular ring 8 is fixedly connected in the circular groove; the insulating tube 7 is sleeved on the outside of the metal connecting tube 1, the outer circular ring 8 in the insulating tube 7 is sleeved on the inner circular ring 6 in the middle of the metal connecting tube 1, and the outer circular ring 8 and the inner circular ring 6 are threadedly connected; the length of the insulating tube 7 is 1.5 times that of the metal connecting tube 1; the outer circular ring 8 is embedded and installed in the middle of the inner wall of the insulating tube 7, and the outer circular ring 8 and the inner circular ring 6 are threadedly connected. After the metal connecting tube 1 is crimped to the joint, the outer circular ring 8 and the inner circular ring 6 are directly connected and the two ends of the insulating tube 7 are sealed with insulating tape to realize the insulation sealing of the joint. Compared with the existing joints that are all sealed with insulating tape, the use of the insulating tube 7 reduces the amount of insulating tape used, has high installation efficiency, good integrity, and good sealing effect. The first pressing block 3 and the second pressing block 5 are staggered and the inner end faces are arc-shaped, which can not only compress the joint to improve the reliability of the joint, but also the gaps between the first pressing block 3 and the second pressing block 5 are connected and connected to the heat dissipation hole 9. The heat dissipation hole 9 is sealed by aluminum foil tape, which can provide a certain heat dissipation space or heat dissipation channel to improve the heat dissipation of the joint, thereby improving the reliability. Solder is pre-placed in the solder tank 4 and after crimping, the metal connecting tube 1 is heated to melt the solder and weld the core wire of the joint, as well as fill the gap. At the same time, the welding hole 2 is used to weld the metal connecting tube 1 and the core wire of the joint after crimping the joint, which further ensures the reliability and current carrying capacity of the joint connection, and ensures the smooth progress of the construction or maintenance process and the safety of long-term use.

Claims

1. A power cable crimping joint with an insulating sleeve for construction, characterized in that: A power cable crimping joint with an insulating sleeve for use in buildings is composed of a metal connecting tube (1) and an insulating tube (7); The metal connecting tube (1) is a round tube, an inner ring (6) is sleeved and fixedly connected to the middle of the outer wall of the metal connecting tube (1), welding holes (2) are circumferentially arranged at both ends of the metal connecting tube (1), and heat dissipation holes (9) are arranged on the inner side of the welding holes (2). The welding holes (2) at both ends of the metal connecting tube (1) are provided with heat dissipation holes (9), and the heat dissipation holes (9) are sealed by aluminum foil tape; the inner wall of the metal connecting tube (1) is provided with a first pressing block (3) and a second pressing block (5), the first pressing block (3) is arranged on the inner wall of the metal connecting tube (1) in an annular array, and the second pressing block (5) is arranged on the inner wall of the metal connecting tube (1) in an annular array, each row of the first pressing blocks (3) and each row of the second pressing blocks (5) are arranged at intervals, and the first pressing blocks (3) and the second pressing blocks (5) in adjacent rows are arranged in a staggered manner, and a solder groove (4) is arranged between the first pressing block (3) and the second pressing block (5), and solder is arranged in the solder groove (4); The insulating tube (7) is a round tube, a round groove is arranged at the center of the inner wall of the insulating tube (7), and an outer ring (8) is fixedly connected in the round groove; The insulating tube (7) is sleeved on the outside of the metal connecting tube (1); the outer ring (8) in the insulating tube (7) is sleeved on the inner ring (6) in the middle of the metal connecting tube (1); the outer ring (8) and the inner ring (6) are threadedly connected; the length of the insulating tube (7) is greater than that of the metal connecting tube (1).

2. The power cable crimping joint with an insulating sleeve for construction according to claim 1, characterized in that: The heat dissipation holes (9) are arranged in a ring array at both ends of the metal connecting tube (1), and the heat dissipation holes (9) penetrate the tube wall of the metal connecting tube (1).

3. The power cable crimping joint with an insulating sleeve for construction according to claim 1, characterized in that: The welding holes (2) are strip-shaped through holes, and the welding holes (2) are arranged along the circumferential direction of the metal connecting pipe (1); the welding holes (2) penetrate the pipe wall of the metal connecting pipe (1).

4. The power cable crimping joint with an insulating sleeve for construction according to claim 1, characterized in that: The depth of the solder groove (4) does not exceed 50% of the thickness of the wall of the metal connecting tube (1).

5. The power cable crimping joint with an insulating sleeve for construction according to claim 1, characterized in that: The length of the insulating tube (7) is 1.5 times that of the metal connecting tube (1).

6. The power cable crimping joint with an insulating sleeve for construction according to claim 1, characterized in that: One end of the first pressing block (3) is fixedly connected to the inner wall of the metal connecting pipe (1), and the other end of the first pressing block (3) is an arc-shaped surface.

7. The power cable crimping joint with an insulating sleeve for construction according to claim 1, characterized in that: One end of the second pressing block (5) is fixedly connected to the inner wall of the metal connecting pipe (1), and the other end of the second pressing block (5) is an arc-shaped surface.

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