A cold shrink intermediate joint

Abstract

The application provides a cold shrink intermediate joint, which comprises two cables and a cold shrink intermediate joint body sleeved on the butt joint position of the two cables, and further comprises two waterproof sleeves arranged at the two ends of the cold shrink intermediate joint body, the waterproof sleeves have a large inner diameter section and a small inner diameter section, the large inner diameter section of the waterproof sleeve is arranged outside the cold shrink intermediate joint body and the small inner diameter section of the waterproof sleeve is sleeved outside the cable, a sealing ring is sleeved outside the waterproof sleeve, an annular groove is formed in the inner circumferential surface of the sealing ring, an elastic bag filled with gas is arranged in the annular groove and the elastic bag is tightly attached to the waterproof sleeve, a fastening ring is sleeved outside the sealing ring to fasten the sealing ring, the fastening ring is provided with a first fastening ring at one end which is attached to the large inner diameter section of the waterproof sleeve and is provided with a second fastening ring at the other end which is attached to the small inner diameter section of the waterproof sleeve. The application effectively improves the waterproof performance between the cable and the cold shrink intermediate joint body and reduces the entry of water vapor from the gap between the cold shrink intermediate joint body and the cable.

Description

Technical Field

[0001] This invention relates to the field of cable connection technology, and more particularly to a cold-shrink intermediate joint. Background Technology

[0002] Cold shrink joints, also known as cold shrink cable accessories, are mainly composed of a tube made of elastic material and an internal spiral support. Cold shrink joints are characterized by their small size and convenient and quick operation.

[0003] Currently, in existing technologies, the installation of cold-shrink joints requires workers to first insert both ends of the cable into the connecting tube, then use tools to squeeze the metal connecting tube to secure it. Afterwards, the internal support of the cold-shrink joint is removed, and the joint shrinks and fits snugly onto the cable surface. Next, the copper shielding mesh and ground wire are installed, followed by the application of PVC tape and an outer layer of waterproof tape to create a new inner sheath. The ground wires at both ends are then connected and wrapped with waterproof tape, and finally, the armor tape is installed. However, the new inner sheath created by wrapping the PVC tape and the outer layer of waterproof tape is prone to radial water seepage at the overlaps because both the PVC tape and waterproof tape are wrapped sequentially. When water seepage occurs, interface creepage can easily occur at the connection between the cable insulation layer and the cold-shrink joint, affecting the normal use of the cable. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes a cold shrink intermediate joint.

[0005] This invention proposes a cold-shrink joint, comprising two cables and a cold-shrink joint body fitted over the joint of the two cables. It also includes two waterproof sleeves disposed at both ends of the cold-shrink joint body. Each waterproof sleeve has a large inner diameter section and a small inner diameter section. The large inner diameter section of the waterproof sleeve is located outside the cold-shrink joint body, while its small inner diameter section is fitted over the cables. A sealing ring is fitted over the waterproof sleeve, and an annular groove is formed on the inner circumference of the sealing ring. An elastic bladder filled with gas is disposed within the annular groove and is tightly fitted to the outside of the waterproof sleeve. A fastening ring is fitted over the sealing ring to secure it, with the inner circumference of the fastening ring fitting against the outer circumference of the sealing ring. One end of the fastening ring has a first fastening ring that fits against the large inner diameter section of the waterproof sleeve, and the other end has a second fastening ring that fits against the small inner diameter section of the waterproof sleeve.

[0006] Preferably, the sealing ring has a first through hole communicating with the elastic bladder and a sealing element is provided in the opening of the first through hole. The fastening ring has a second through hole communicating with the first through hole. A fixing plate is provided in the second through hole to seal the second through hole. An adjusting element for opening the sealing element is provided on the fixing plate. An inflation hole is provided on the fixing plate. A one-way valve that allows external gas to enter the second through hole is provided in the inflation hole.

[0007] Preferably, a sealing tube extending into the first through hole is connected inside the second through hole, and the outer surface of the sealing tube is in contact with the inner surface of the first through hole.

[0008] Preferably, the sealing element includes an annular plate fixed inside the first through hole and coaxially arranged with the first through hole. A sealing plate is movably arranged inside the annular plate to seal it. Multiple connecting rods are circumferentially connected to the side of the sealing plate away from the second through hole. The end of the connecting rod away from the sealing plate is slidably connected to a groove in the inner wall of the first through hole, and an elastic element connected to the connecting rod is provided in the groove. An adjusting element is used to drive the sealing plate to move axially along the first through hole.

[0009] Preferably, the adjusting component includes an adjusting rod, one end of which passes through the fixing plate, extends out of the second through hole, and is threadedly connected to the fixing plate, while the other end of the adjusting rod extends into the second through hole and contacts the sealing plate.

[0010] Preferably, the inner circumferential surface of the sealing ring is in contact with the outer circumferential surface of the waterproof sleeve. Two annular grooves are provided on the inner circumferential surface of the sealing ring, and an elastic bladder is provided in each of the two annular grooves. One elastic bladder is tightly fitted to the outside of the large inner diameter section of the waterproof sleeve, and the other elastic bladder is tightly fitted to the small inner diameter section of the waterproof sleeve.

[0011] Preferably, a first limiting ring and a second limiting ring, coaxial with the sealing ring, are respectively provided on both sides of the waterproof sleeve. The first limiting ring abuts against the sealing ring and the first fastening ring on both sides, and the second limiting ring abuts against the sealing ring and the second fastening ring on both sides.

[0012] Preferably, both the first limiting ring and the second limiting ring are formed by wrapping waterproof tape around the outside of the waterproof sleeve.

[0013] Preferably, the fastening ring is wrapped with waterproof tape, with both ends of the waterproof tape extending to the cable and the body of the cold shrink joint and wrapped around the cable and the body of the cold shrink joint.

[0014] Preferably, the fastening ring includes two half-rings, which are arranged opposite each other and joined together to form a fastening ring. One half-ring has multiple insertion holes on its end face, and the other half-ring has multiple insertion rods that are adapted to the insertion holes on its end face. The multiple insertion rods are respectively inserted into the multiple insertion holes.

[0015] This invention proposes a cold-shrink joint, which uses a waterproof sleeve at both ends of the cold-shrink joint body where it connects to the cable. The waterproof sleeve is elastic and can fit tightly against the outer surface of the cable and the cold-shrink joint body. By setting a sealing ring and a fastening ring to tighten the sealing ring, two gas-filled elastic bladders can tightly press against the large-diameter and small-diameter sections of the waterproof sleeve, respectively. This increases the tightness between the waterproof sleeve and the cold-shrink joint body and the cable, effectively improving the waterproof performance between the cable and the cold-shrink joint body and reducing the entry of moisture from the gaps between the cold-shrink joint body and the cable. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a cold shrink intermediate joint proposed in this invention;

[0017] Figure 2 This is a cross-sectional view of a cold shrink joint proposed in this invention;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 for Figure 3 Enlarged view at point B in the middle;

[0020] Figure 5 This is a schematic diagram of one half-ring structure of the fastening ring in a cold shrink intermediate joint proposed in this invention;

[0021] Figure 6 This is a schematic diagram of the structure of the other half of the fastening ring in a cold shrink intermediate joint proposed in this invention. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] Reference Figures 1-2 This invention proposes a cold-shrink joint, comprising two cables 1 and a cold-shrink joint body 2 fitted onto the joint of the two cables 1, and further comprising two waterproof sleeves 3 disposed at both ends of the cold-shrink joint body 2, wherein:

[0024] The waterproof sleeve 3 has a large inner diameter section and a small inner diameter section. The large inner diameter section of the waterproof sleeve 3 is located outside the body 2 of the cold shrink intermediate joint, and its small inner diameter section is fitted outside the cable 1. A sealing ring 4 is fitted over the waterproof sleeve 3. The inner circumferential surface of the sealing ring 4 is in contact with the outer circumferential surface of the waterproof sleeve 3. Two annular grooves are formed on the inner circumferential surface of the sealing ring 4. Each annular groove is provided with an elastic bladder 5 filled with gas. One elastic bladder 5 is tightly fitted outside the large inner diameter section of the waterproof sleeve 3, and the other elastic bladder is tightly fitted inside the small inner diameter section of the waterproof sleeve. A fastening ring 6 is fitted over the sealing ring 4 to secure it. The inner circumferential surface of the fastening ring 6 is in contact with the outer circumferential surface of the sealing ring 4. One end of the fastening ring 6 is provided with a first fastening ring 7 that is in contact with the large inner diameter section of the waterproof sleeve 3, and the other end is provided with a second fastening ring 8 that is in contact with the small inner diameter section of the waterproof sleeve 3.

[0025] By fitting a waterproof sleeve 3 at both ends of the cold shrink joint body 2 where it connects to the cable 1, the waterproof sleeve 3 is elastic and can fit tightly against the outer surface of the cable 1 and the cold shrink joint body 2. By setting a sealing ring 4 and a fastening ring 6 to tighten the sealing ring 4, the two gas-filled elastic bladders 5 can press tightly against the large inner diameter section and the small inner diameter section of the waterproof sleeve 3, respectively. This increases the tightness between the waterproof sleeve 3 and the cold shrink joint body 2 and the cable 1, thereby effectively improving the waterproof performance between the cable 1 and the cold shrink joint body 2 and reducing the entry of water vapor from the gap between the cold shrink joint body 2 and the cable 1.

[0026] Reference Figure 2 , Figure 3 , Figure 4 Specifically, for ease of installation and inflation of the elastic bladder, the sealing ring 4 has a first through hole 9 communicating with the elastic bladder 5, and a sealing element is installed inside the first through hole 9. The fastening ring 6 has a second through hole 10 communicating with the first through hole 9. A fixing plate 11 is installed inside the second through hole 10 to seal it. The fixing plate 11 has an adjusting element for opening the sealing element and an inflation hole 12. A one-way valve is installed inside the inflation hole 12 to allow external gas to enter the second through hole 10. The adjusting element drives the sealing element to move, thereby opening the sealing ring 4. Air is then pumped into the second through hole through the inflation hole 12 using an air pump. The gas enters the elastic bladder 5 through the first through hole 9 and the sealing ring 4, thus inflating the elastic bladder 5. After inflation, the adjusting element drives the sealing element to move again to seal the sealing ring 4, preventing gas leakage.

[0027] Reference Figure 2 , Figure 3 , Figure 4In a further embodiment, in order to improve the sealing performance at the junction of the first through hole 9 and the second through hole 10, a sealing tube 13 extending into the first through hole 9 is connected inside the second through hole 10, and the outer surface of the sealing tube 13 is in contact with the inner surface of the first through hole 9.

[0028] Reference Figure 2 , Figure 3 , Figure 4 Preferably, the sealing element includes an annular plate 14 fixed within and coaxially arranged with the first through hole 9. A sealing plate 15 is movably disposed within the annular plate 14 to seal it. A plurality of connecting rods 16 are circumferentially connected to the side of the sealing plate 15 away from the second through hole 10. The end of the connecting rod 16 away from the sealing plate 15 is slidably connected to a groove 17 on the inner wall of the first through hole 9, and an elastic element 18 connected to the connecting rod 16 is disposed within the groove 17. An adjusting element is used to drive the sealing plate 15 to move axially along the first through hole 9. Preferably, the adjusting element includes an adjusting rod 19. One end of the adjusting rod 19 passes through the fixing plate 11, extends out of the second through hole 10, and is threadedly connected to the fixing plate 11. The other end of the adjusting rod 19 extends into the second through hole 10 and contacts the sealing plate 15.

[0029] As described above, during inflation, by rotating the adjusting rod 19, the adjusting rod 19 presses against and pushes the sealing plate 15 to move away from the sealing ring 4, thereby connecting the first through hole 9 with the second through hole 10. The inflation device inflates the elastic bladder 5 through the inflation hole 12. After inflation is completed, rotating the adjusting rod 19 contacts the sealing plate 15, and the sealing plate 15 resets under the action of the elastic element 18 to seal the ring plate 14. After inflation is completed, the adjusting rod 19 can be removed.

[0030] Reference Figure 2 , Figure 3 In a further embodiment, a first limiting ring 20 and a second limiting ring 21, coaxially arranged on both sides of the sealing ring 4, are respectively provided on the waterproof sleeve 3. The first limiting ring 20 abuts against the sealing ring 4 and the first fastening ring 7 on both sides, and the second limiting ring 21 abuts against the sealing ring 4 and the second fastening ring 8 on both sides. Both the first limiting ring 20 and the second limiting ring 21 are formed by wrapping waterproof tape around the outside of the waterproof sleeve 3. The first limiting ring 20 and the second limiting ring 21 limit and fix the sealing ring, thereby improving the connection tightness between the sealing ring 4 and the waterproof sleeve 3 after installation.

[0031] In a further embodiment, the fastening ring 6 is wrapped with waterproof tape, with both ends of the waterproof tape extending to the cable 1 and the cold shrink joint body 2 and wrapped around the cable 1 and the cold shrink joint body 2, respectively.

[0032] Reference Figure 5 , Figure 6In a further embodiment, the fastening ring 6 includes two half-rings, which are arranged opposite to each other and assembled into a fastening ring 6. One half-ring has multiple insertion holes 22 on its end face, and the other half-ring has multiple insertion rods 23 that are adapted to the insertion holes 22 on its end face. The multiple insertion rods 23 are respectively inserted into the multiple insertion holes 22.

[0033] The specific installation method of this invention is described below:

[0034] First, peel off the outer sheath, steel armor, inner sheath, copper shielding layer, and insulation layer one by one from the ends of the two cables that need to be connected.

[0035] Secondly, sealing rings 4 and waterproof sleeves 3 are respectively put on the stripped ends of the two cables 1, and cold shrink intermediate joint body 2 and copper mesh are put on one of the cables.

[0036] Then, put the connecting tube over the conductors of the two cables 1, crimp the connecting tube, clean it, and then apply silicone grease to the connection.

[0037] Next, align the cold shrink joint body 2 with the shrink positioning point and remove the support strip inside the cold shrink joint body 2. After the cold shrink joint body 2 shrinks by more than 50%, put the waterproof sleeve 3 at the shrunken end of the cold shrink joint body 2 onto the cold shrink joint body 2 (to prevent the cold shrink joint body 2 from shrinking and misaligning). Then continue to remove the support strip until it is completely removed. After that, put the waterproof sleeve 3 at the other end onto the other end of the cold shrink joint body 2.

[0038] After moving the two sealing rings 4 to the designated positions of the two waterproof sleeves 3, waterproof tape is wrapped around the waterproof sleeves 3 at both ends of the sealing rings 4, thereby forming a first limiting ring 20 and a second limiting ring 21 at both ends of the sealing rings 4.

[0039] Fastening rings 6 are fitted over the two sealing rings 4 respectively. Specifically, one half-ring of the fastening ring 6 with an adjusting rod is aligned with the first through hole 9 of the sealing ring, so that the two sealing tubes 13 of the half-ring are inserted into the first through hole 9 of the sealing ring 4 respectively. Then, the other half-ring is fastened together with the half-ring to fix the sealing ring 4, and the first fastening ring 7 and the second fastening ring 8 of the fastening ring 6 are pressed against the first limiting ring 20 and the second limiting ring 21 respectively. Except for the two second through holes 10, waterproof tape is wrapped around the other parts of the fastening ring 6 in a semi-overlapping manner, and the waterproof tape is also wrapped around the waterproof sleeve 3, the cable 1, and the cold shrink intermediate joint body 2.

[0040] By rotating the adjusting rod 19, the adjusting rod 19 pushes the sealing plate 15 to move away from the ring plate 14, thereby connecting the first through hole 9 with the second through hole 10. The inflation device inflates the elastic bladder 5 through the inflation hole 12, so that the elastic bladder 5 and the waterproof sleeve 3 are tightly pressed together. After inflation, the adjusting rod 19 is rotated to contact the sealing plate 15. Under the action of the elastic element 18, the sealing plate 15 resets and seals the ring plate 14. After inflation is completed, the adjusting rod 19 is removed, and waterproof tape is continued to be wrapped around the two second through holes 10 of the fastening ring 6.

[0041] Finally, install the copper shielding mesh and ground wire, make a new inner sheath, connect the ground wires at both ends and wrap them with waterproof tape, and install the armor belt.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cold-shrink joint, comprising two cables (1) and a cold-shrink joint body (2) fitted onto the mating position of the two cables (1), characterized in that, It also includes two waterproof sleeves (3) set at both ends of the cold shrink intermediate joint body (2). The waterproof sleeve (3) has a large inner diameter section and a small inner diameter section. The large inner diameter section of the waterproof sleeve (3) is set outside the cold shrink intermediate joint body (2) and its small inner diameter section is set outside the cable (1). The waterproof sleeve (3) is covered with a sealing ring (4). The inner circumferential surface of the sealing ring (4) is provided with a ring groove. An elastic bladder (5) filled with gas is set in the ring groove and the elastic bladder (5) is tightly fitted to the outside of the waterproof sleeve (3). The sealing ring (4) is covered with a fastening ring (6) for fastening it. The inner circumferential surface of the fastening ring (6) is fitted to the outer circumferential surface of the sealing ring (4). One end of the fastening ring (6) is provided with a first fastening ring (7) that fits to the large inner diameter section of the waterproof sleeve (3) and the other end is provided with a second fastening ring (8) that fits to the small inner diameter section of the waterproof sleeve (3). The sealing ring (4) has a first through hole (9) communicating with the elastic bladder (5) and a sealing element is provided in the opening of the first through hole (9). The fastening ring (6) has a second through hole (10) communicating with the first through hole (9). A fixing plate (11) is provided in the second through hole (10) to seal the second through hole (10). An adjusting element for opening the sealing element is provided on the fixing plate (11) and an inflation hole (12) is provided on the fixing plate (11). A one-way valve that allows external gas to enter the second through hole (10) is provided in the inflation hole (12). The inner circumferential surface of the sealing ring (4) is fitted with the outer circumferential surface of the waterproof sleeve (3). Two ring grooves are opened on the inner circumferential surface of the sealing ring (4), and an elastic bladder (5) is provided in both ring grooves. One elastic bladder (5) is tightly fitted to the outside of the large inner diameter section of the waterproof sleeve (3), and the other elastic bladder (5) is tightly fitted to the small inner diameter section of the waterproof sleeve (3).

2. The cold-shrink intermediate joint according to claim 1, characterized in that, The second through hole (10) is connected to a sealing tube (13) extending into the first through hole (9), and the outer surface of the sealing tube (13) is in contact with the inner surface of the first through hole (9).

3. The cold-shrink intermediate joint according to claim 1, characterized in that, The sealing element includes an annular plate (14) fixed inside the first through hole (9) and coaxially arranged with the first through hole (9). A sealing plate (15) is movably arranged inside the annular plate (14) to seal it. Multiple connecting rods (16) are circumferentially connected to the side of the sealing plate (15) away from the second through hole (10). The end of the connecting rod (16) away from the sealing plate (15) is slidably connected to the groove (17) on the inner wall of the first through hole (9), and an elastic element (18) connected to the connecting rod (16) is provided in the groove (17). An adjusting element is used to drive the sealing plate (15) to move axially along the first through hole (9).

4. The cold-shrink intermediate joint according to claim 3, characterized in that, The adjusting component includes an adjusting rod (19). One end of the adjusting rod (19) passes through the fixing plate (11), extends out of the second through hole (10), and is threadedly connected to the fixing plate (11). The other end of the adjusting rod (19) extends into the second through hole (10) and contacts the sealing plate (15).

5. The cold-shrink intermediate joint according to any one of claims 1-3, characterized in that, The waterproof sleeve (3) is provided with a first limiting ring (20) and a second limiting ring (21) on both sides of the sealing ring (4). The first limiting ring (20) abuts against the sealing ring (4) and the first fastening ring (7) on both sides, and the second limiting ring (21) abuts against the sealing ring (4) and the second fastening ring (8) on both sides.

6. The cold-shrink intermediate joint according to claim 5, characterized in that, The first limiting ring (20) and the second limiting ring (21) are both formed by wrapping waterproof tape around the outside of the waterproof sleeve (3).

7. The cold-shrink intermediate joint according to any one of claims 1-3, characterized in that, Waterproof tape is wrapped around the fastening ring (6), with both ends of the waterproof tape extending to the cable (1) and the cold shrink joint body (2) respectively, and wrapped around the cable (1) and the cold shrink joint body (2).

8. The cold shrink joint according to any one of claims 1-3, characterized in that, The fastening ring (6) includes two half rings, which are arranged opposite each other and joined together to form the fastening ring (6). One half ring has multiple insertion holes (22) on its end face, and the other half ring has multiple insertion rods (23) that are compatible with the insertion holes (22) on its end face. The multiple insertion rods (23) are inserted into the multiple insertion holes (22) respectively.

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