Cable cold shrinkage joint

Abstract

The utility model discloses a cable cold contraction joint, which belongs to the field of cable joints, and comprises a cold contraction finger sleeve, an inner cushion layer and an outer connecting pipe, the cold contraction finger sleeve comprises a cylindrical sleeve and a plurality of finger tubes connected to the end part of the sleeve, and the sleeve and the plurality of finger tubes are made of elastic materials; the sleeve is wrapped on the cable sheath, the plurality of finger tubes are respectively wrapped on a plurality of wire cores of the cable and are in one-to-one correspondence, the inner cushion layer is in a ring shape and is sleeved on the cable sheath, and one end, far away from the plurality of finger tubes, of the sleeve is at least partially wrapped on the outer side of the inner cushion layer; the outer connecting pipe is detachably connected with the inner cushion layer, an inclined wall is formed on the inner side of the outer connecting pipe, and at least part of the inclined wall is pressed on the sleeve; the inclined wall of the outer connecting pipe is pressed on the step portion of the sleeve, the step portion of the sleeve is extruded inwards and tightly attached to the cable sheath, the sleeve is tightly attached to the cable sheath, and therefore the problem that the sealing performance is poor due to the fact that the end of the sleeve is loosened can be avoided.

Description

Technical Field

[0001] The utility model belongs to the field of cable joints, in particular to a cable cold shrink joint. Background Art

[0002] Cable cold shrink joints are made of elastic materials (commonly used are silicone rubber and EPDM rubber) that are injection vulcanized in the factory, and then expanded and lined with plastic spiral supports to form various cable accessories. It is a kind of cable accessory that relies on elastic retraction at room temperature, rather than heat shrink cable accessories that need to be heated by fire to shrink, so it is commonly known as cold shrink cable accessories.

[0003] The cold shrink cable terminal head has the advantages of small size, convenient and quick operation, no need for special tools, wide application range and few product specifications. Although its initial performance is good, it is exposed to harsh environmental conditions during long-term operation, such as extreme dryness, high temperature and long-term exposure, which may have a certain impact on its material, and there is a potential possibility of fine cracks, material aging, and reduced sealing performance. In addition, if it is improperly operated during the installation process, such as not fully stretched in place, impurities mixed in during installation that affect the seal, or the material itself is poor, the elasticity is insufficient, etc., the end of the cold shrink tube may become loose;

[0004] Therefore, it is necessary to provide a cable cold shrink joint to solve the above problems. Utility Model Content

[0005] The embodiment of the utility model provides a cable cold shrink joint to solve the problems in the prior art.

[0006] The embodiment of the utility model adopts the following technical scheme: a cable cold shrink joint, including a cold shrink finger sleeve, an inner cushion layer and an outer connecting tube, the cold shrink finger sleeve includes a cylindrical sleeve and a plurality of finger tubes connected to the end of the sleeve, the sleeve and the plurality of finger tubes are made of elastic material; the sleeve is covered on the cable sheath, the plurality of finger tubes are respectively covered on a plurality of wire cores on the cable and correspond one to one, the inner cushion layer is ring-shaped and sleeved on the cable sheath, and one end of the sleeve away from the plurality of finger tubes is at least partially covered on the outside of the inner cushion layer; the outer connecting tube is detachably connected to the inner cushion layer, an inclined wall is formed on the inner side of the outer connecting tube, and the inclined wall is at least partially pressed on the sleeve.

[0007] Preferably, an annular flange is coaxially provided on the outer side of the inner cushion layer, external threads are evenly distributed on the surface of the annular flange, and an internal thread threadably connected to the external thread is also provided on the inner side of the external connecting pipe.

[0008] Preferably, a limiting wall extending radially along the external connecting pipe is formed at one end of the inclined wall.

[0009] Preferably, the outer wall of the external connecting pipe is provided with a plurality of friction protrusions.

[0010] Preferably, one end of the inner cushion layer away from the cold shrink finger sleeve is coated with an insulating waterproof tape to achieve sealing with the cable sheath, and one end of the outer connecting tube close to the plurality of finger tubes is also coated with an insulating waterproof tape to achieve sealing with the casing.

[0011] Preferably, the finger tubes are arranged in three groups and are compatible with three-core cables.

[0012] Preferably, a crimping terminal is installed at the end of each wire core, and the finger tube is covered on the corresponding crimping terminal.

[0013] At least one of the above technical solutions adopted in the embodiment of the utility model can achieve the following beneficial effects:

[0014] Firstly, the outer connecting tube of the utility model is detachably connected to the inner cushion layer, and an inclined wall is formed on the inner side of the outer connecting tube, and the inclined wall at least partially presses on the sleeve. Since the inner cushion layer is higher than the outer wall of the cable sheath, when the sleeve is wrapped on the inner cushion layer, a step portion will be formed at the end of the sleeve just contacting the inner cushion layer. When the outer connecting tube is connected to the inner cushion layer, the inclined wall of the outer connecting tube is pressed on the step portion of the sleeve, squeezing the step portion of the sleeve inward and tightly against the cable sheath, so that the sleeve and the cable sheath are tightly attached, thereby avoiding the problem of looseness of the sleeve end and resulting in poor sealing performance.

[0015] Secondly, the utility model forms a limiting wall extending radially along the external connecting pipe at one end of the inclined wall. When the inclined wall is pressed on the step portion of the sleeve, the inclined wall, the annular flange and the outer wall of the sleeve form a closed cavity, and the end of the sleeve is located in the closed cavity, thereby preventing the sleeve from being damaged by airflow or sunlight for a long time and improving the service life of the cold shrink tube sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 It is a three-dimensional structural cross-sectional view of the utility model;

[0019] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0020] Figure 4It is an exploded view of the inner cushion layer and the casing of the utility model;

[0021] Figure 5 It is a cross-sectional view of the inner cushion layer and the outer connecting pipe of the utility model;

[0022] Reference numerals

[0023] 1-cable; 11-sheath; 12-wire core; 13-crimping terminal; 2-cold shrink finger sleeve; 21-sleeve; 211-step portion; 22-finger tube; 3-inner cushion layer; 31-annular flange; 32-external thread; 4-external connecting tube; 41-inclined wall; 42-internal thread; 43-limiting wall; 44-friction bump; 5-insulating waterproof tape. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in combination with the specific embodiments of the utility model and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The technical solutions provided by various embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] refer to Figures 1 to 5 The utility model provides a cable cold shrink joint, including a cold shrink finger sleeve 2, an inner cushion layer 3 and an outer connecting tube 4, wherein the cold shrink finger sleeve 2 includes a cylindrical sleeve 21 and a plurality of finger tubes 22 connected to the end of the sleeve 21, and the sleeve 21 and the plurality of finger tubes 22 are both made of elastic materials, usually made of silicone rubber, ethylene propylene rubber or other polymer materials;

[0027] The sleeve 21 and the plurality of finger tubes 22 in the cold shrink finger sleeve 2 are formed by injection vulcanization of an elastomeric material in a factory, and then expanded and lined with a plastic spiral support. It is a kind of sleeve 21 that is covered on the sheath 11 of the cable 1 by elastic retraction force at room temperature by pulling out the spiral support to shrink, and the plurality of finger tubes 22 are respectively covered on the plurality of wire cores 12 on the cable 1 and correspond one to one. The inner cushion layer 3 is in a ring shape and is sleeved on the sheath 11 of the cable 1. The end of the sleeve 21 away from the plurality of finger tubes 22 is at least partially covered on the outside of the inner cushion layer 3.

[0028] The outer connecting tube 4 is detachably connected to the inner cushion layer 3. An inclined wall 41 is formed inside the outer connecting tube 4, and the inclined wall 41 at least partially presses on the sleeve 21. Since the inner cushion layer 3 is higher than the outer wall of the cable 1 sheath 11, when the sleeve 21 is wrapped on the inner cushion layer 3, a step portion 211 (such as Figure 3 ), and when the outer connecting tube 4 is connected to the inner cushion layer 3, the inclined wall 41 of the outer connecting tube 4 is pressed on the step portion 211 of the sleeve 21, elastically squeezing the step portion 211 of the sleeve 21 inward and tightly against the sheath 11 of the cable 1 (such as Figure 3 The cross-overlapping position of the middle section lines is the location where the sleeve 21 is elastically deformed), so that the sleeve 21 is tightly attached to the sheath 11 of the cable 1, thereby avoiding the problem of looseness at the end of the sleeve 21 and resulting in poor sealing performance.

[0029] Specifically, in one embodiment, an annular flange 31 is coaxially provided on the outer side of the inner cushion layer 3, and external threads 32 are evenly distributed on the surface of the annular flange 31. The inner side of the external connecting pipe 4 is also provided with an internal thread 42 threadedly connected to the external thread 32. The external connecting pipe 4 is threadedly connected to the inner cushion layer 3 by a threaded connection. The external connecting pipe 4 can also be detachably connected to the inner cushion layer 3 by other detachable bolts or elastic clips.

[0030] Since the cold shrink finger sleeve 2 is in harsh environmental conditions for a long time, such as extreme dryness, high temperature and long-term exposure, its material may be affected to a certain extent, and there is a potential possibility of fine cracks, which may cause the end of the sleeve 21 to loosen and cause a poor seal; specifically, a limiting wall 43 extending radially along the external connecting tube 4 is formed at one end of the inclined wall 41, and when the inclined wall 41 is pressed on the step portion 211 of the sleeve 21, the inclined wall 41 and the annular flange 31 and the outer wall of the sleeve 21 are surrounded to form a closed cavity, and the end of the sleeve 21 is in the closed cavity, thereby preventing the sleeve 21 from being damaged by airflow or sunlight for a long time, thereby improving the service life of the cold shrink sleeve.

[0031] During specific use, it should be noted that before installing the cold shrink finger sleeve 2, the inner cushion layer 3 should be put on the cable 1 sheath 11 in advance, and then the cold shrink finger sleeve 2 should be installed on the cable 1. At this time, after the spiral support is pulled out of the sleeve 21, the end of the sleeve 21 will be tightened on the inner cushion layer 3, and then the external connecting tube 4 is put on the sleeve 21, and the external connecting tube 4 is threadedly connected to the inner cushion layer 3.

[0032] Specifically, the outer wall of the external connection tube 4 is provided with a plurality of friction protrusions 44, so as to provide the user with a better gripping effect when installing the external connection tube 4 and prevent slipping.

[0033] The end of the inner cushion layer 3 away from the cold shrink finger sleeve 2 is coated with an insulating waterproof tape 5 to achieve sealing with the cable 1 sheath 11, and the end of the external connecting tube 4 close to the plurality of finger tubes 22 is also coated with an insulating waterproof tape 5 to achieve sealing with the sleeve 21, further improving the sealing between the cable 1 cold shrink joint and the cable 1 wire.

[0034] The finger tubes 22 are configured into three groups and are compatible with the three-core 12 cable 1, so that it is suitable for the installation of the three-core 12 cable 1. For cables 1 with other numbers of cores 12, it is only necessary to change the number of finger tubes 22 accordingly.

[0035] A crimping terminal 13 is installed at the end of each wire core 12 , and the finger tube 22 is covered on the corresponding crimping terminal 13 .

[0036] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A cable cold shrink joint, characterized in that: The cold shrink finger sleeve (2) comprises an inner cushion layer (3) and an outer connecting tube (4), wherein the cold shrink finger sleeve (2) comprises a cylindrical sleeve (21) and a plurality of finger tubes (22) connected to the end of the sleeve (21), and the sleeve (21) and the plurality of finger tubes (22) are both made of elastic material; The sleeve (21) is coated on the sheath (11) of the cable (1); the plurality of finger tubes (22) are respectively coated on the plurality of wire cores (12) on the cable (1) and correspond to each other one by one; the inner cushion layer (3) is in a ring shape and is sleeved on the sheath (11) of the cable (1); an end of the sleeve (21) away from the plurality of finger tubes (22) is at least partially coated on the outside of the inner cushion layer (3); The outer connecting pipe (4) is detachably connected to the inner cushion layer (3); an inclined wall (41) is formed on the inner side of the outer connecting pipe (4), and the inclined wall (41) is at least partially pressed on the sleeve (21).

2. A cable cold shrink joint according to claim 1, characterized in that: An annular flange (31) is coaxially arranged on the outer side of the inner cushion layer (3), external threads (32) are evenly distributed on the surface of the annular flange (31), and an internal thread (42) threadably connected to the external thread (32) is also arranged on the inner side of the external connecting pipe (4).

3. A cable cold shrink joint according to claim 1 or 2, characterized in that: A limiting wall (43) extending radially along the external connecting pipe (4) is formed at one end of the inclined wall (41).

4. A cable cold shrink joint according to claim 2, characterized in that: The outer wall of the external connecting pipe (4) is provided with a plurality of friction protrusions (44).

5. A cable cold shrink joint according to claim 1, characterized in that: One end of the inner cushion layer (3) away from the cold shrink finger sleeve (2) is coated with an insulating waterproof tape (5) to achieve sealing with the cable (1) sheath (11), and one end of the outer connecting tube (4) close to the plurality of finger tubes (22) is also coated with an insulating waterproof tape (5) to achieve sealing with the sleeve (21).

6. A cable cold shrink joint according to claim 1, characterized in that: The finger tubes (22) are arranged in three groups and are compatible with the three-core (12) cable (1).

7. A cable cold shrink joint according to claim 1 or 6, characterized in that: A crimping terminal (13) is installed at the end of each wire core (12), and the finger tube (22) is covered on the corresponding crimping terminal (13).

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