Quick installation power cable joint

Abstract

The application discloses a kind of quick installation power cable joints, it is related to cable installation technical field, the cable joint includes joint body, conductive contact and conductive connecting piece;The joint body includes reinforced insulation, semiconductive stress cone, joint insulation shield, high-voltage shield tube and joint conductive piece, the high-voltage shield tube is arranged in the inner cavity of reinforced insulation, the joint conductive piece is embedded in high-voltage shield tube, and the both ends of the joint conductive piece are respectively provided with the conductive mounting hole for installing conductive contact;The conductive contact is provided with two and is respectively connected with two end cable conductor end portion, and the outer surface of each conductive contact is provided with mounting groove;The conductive connecting piece is provided with two and is respectively installed in corresponding mounting groove, in installation state, the conductive connecting piece realizes joint conductive piece and conductive contact electrical connection.The cable joint has the advantages of small risk, short installation time, convenient operation, low skill requirement for construction personnel etc..

Description

TECHNICAL FIELD

[0001] The present application relates to a cable joint, in particular to a power cable joint with quick installation. BACKGROUND

[0002] According to the statistical result analysis of the 110kV and above cable system fault cases, the cable joint fault accounts for as high as 50.87% in the accessory fault, and the cable joint is always the weakest link to cause the accident. The insulation structure of the cable joint is relatively complex compared with the cable body, and defects are easily caused in the production and on-site construction, leaving hidden troubles of faults, so the cable joint is still the focus of the power supply company.

[0003] The cable joint installation environment is complex, and the current conventional cable joint installation needs to install the joint on one end of the cable and then pull back to the middle of the two end connecting cables. The cable processing length is relatively long, the construction difficulty is great, the installation time is long, and the technical requirements for the construction personnel are high. Moreover, during the installation, the outer shielding of the polished cable and the enhanced insulation contact may cause the risk of enhanced insulation adhesion of conductive particles, which may affect the safe operation of the cable joint. SUMMARY

[0004] The purpose of the present application is to overcome the above-mentioned problems, and to provide a power cable joint with quick installation, which has the advantages of small risk, short installation time, convenient operation, and low skill requirement for construction personnel.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] A power cable joint with quick installation, comprising a joint body, a conductive contact and a conductive connecting piece; the joint body comprises enhanced insulation, semi-conductive stress cone, joint insulation shielding, high-voltage shielding tube and joint conductive piece, the high-voltage shielding tube is arranged in the inner cavity of the enhanced insulation, and the joint conductive piece is embedded in the high-voltage shielding tube, both ends of the joint conductive piece are respectively provided with conductive mounting holes for mounting the conductive contact; the conductive contact is provided with two and is connected with the conductor end of the two end cables respectively, the outer surface of each conductive contact is provided with a mounting groove; the conductive connecting piece is provided with two and is mounted in the corresponding mounting groove, and in the mounting state, the conductive connecting piece realizes the electrical connection between the joint conductive piece and the conductive contact.

[0007] In one preferred embodiment of the present application, the conductive mounting hole is of a structure with a small inner diameter and a large outer diameter, which comprises a first hole position with a larger size and a second hole position with a smaller size; the conductive contact comprises a first mounting part and a second mounting part, the first mounting part is located in the first hole position, and the second mounting part is located in the second hole position;

[0008] The first hole site and the second hole site are provided with a positioning surface for positioning the first mounting part. In this way, the conductive contact can be positioned during installation, and the stress cone and the cable insulation shield can be prevented from being misaligned during the insertion of the cable into the connector body.

[0009] Further, the first mounting part is fixedly connected with the end of the cable conductor, and the second mounting part is provided with the mounting groove.

[0010] Further, the first mounting part and the second mounting part are both provided with a chamfer structure, and a round corner structure is arranged at the boundary of the chamfer structure. In this way, the guide head can be used during installation, without the need for additional installation guide heads, and the connector body will not be scratched.

[0011] Further, the conductive contact is fixedly connected with the connector conductive part through a locking structure, and the locking structure comprises a locking block, a locking driving assembly for driving the locking block to be inserted between the conductive contact and the connector conductive part, and a locking assembly for locking the power of the locking driving assembly.

[0012] Further, an annular clamping groove is arranged on the inner wall of the second hole site of the connector conductive part.

[0013] The conductive contact is provided with a sliding installation hole and a locking hole.

[0014] In a non-installed state, one end of the locking block is located in the locking hole, and the other end of the locking block is located in the sliding installation hole; in an installed state, one end of the locking block is located in the annular clamping groove, and the other end of the locking block is located in the locking hole.

[0015] Further, the locking driving assembly is arranged in the sliding installation hole, and the locking driving assembly comprises a locking driving spring and a locking driving block. The two ends of the locking driving spring are respectively abutted against the locking driving block and the hole wall of the sliding installation hole. The locking driving block is provided with a first extrusion inclined surface. The locking block is provided with a second extrusion inclined surface matched with the first extrusion inclined surface.

[0016] Further, the conductive contact is further provided with a locking installation hole and an avoiding hole. The locking assembly is arranged in the locking installation hole, and the locking assembly comprises a locking swing part and a locking elastic part. The locking swing part is rotationally connected in the locking installation hole. With the rotation center as a boundary, one end of the locking swing part is provided with an unlocking extrusion part, and the other end of the locking swing part is provided with a locking part. The locking driving block is provided with a locking groove matched with the locking part. In a locked state, one end of the unlocking extrusion part extends to the outside of the side surface of the first mounting part corresponding to the positioning surface through the avoiding hole, and one end of the locking part extends into the locking groove. The two ends of the locking elastic part are abutted against the hole wall of the locking installation hole and the locking swing part.

[0017] Through the above structure, in the process of inserting the conductive contact into the conductive mounting hole, the unlocking extrusion part of the locking swing piece gradually approaches the positioning surface of the joint conductive piece, when the unlocking extrusion part of the locking swing piece contacts the positioning surface of the joint conductive piece, the positioning surface extrudes the unlocking extrusion part of the locking swing piece, at this time, the locking swing piece swings, so that the locking part of the locking swing piece comes out of the locking groove of the locking driving block, and the locking of the locking driving block is released, at this time, the lock hole of the conductive contact is just communicated with the annular clamping groove of the joint conductive piece; the potential energy of the locking driving spring is released instantaneously, the locking driving block is pushed to move forward, the locking block is driven to move away from the sliding mounting hole through the first extrusion inclined surface of the locking driving block, so that one end of the locking block is inserted into the annular clamping groove of the joint conductive piece, thereby completing the locking operation and realizing the fixation between the cable and the joint.

[0018] Further, the locking driving block is further provided with a supporting plane for supporting the locking block, and the supporting plane is located at the top of the first extrusion inclined surface. In this way, when the locking block enters the annular clamping groove, the locking block is limited and supported by the locking driving block of the supporting plane, so that the locking block cannot automatically exit the annular clamping groove, thereby stably connecting the cable and the joint together.

[0019] Further, the conductive contact is further provided with a spring mounting hole, and the spring mounting hole is provided with an anti-falling spring, and the two ends of the anti-falling spring are respectively abutted against the inner bottom surface of the spring mounting hole and the side surface of the locking block. In this way, when the locking block is located below, the anti-falling spring can elastically limit the locking block in the lock hole to prevent the locking block from falling downward.

[0020] Further, the locking structure is provided with at least two groups and is uniformly arranged along the circumferential direction.

[0021] In one preferred embodiment of the present application, the conductive contact and the joint conductive piece are in clearance fit.

[0022] Further, the conductive connecting piece is a hollow elastic structure, and in the non-installed state, the outer diameter of the conductive connecting piece is greater than the inner diameter of the second hole position. Through the above structure, when the conductive contact is inserted into the conductive mounting hole of the joint conductive piece, the conductive connecting piece will be self-adapted to the hole wall of the conductive mounting hole, so that the conductive contact and the joint conductive piece are fully conductive, thereby ensuring smooth power transmission.

[0023] In one preferred embodiment of the present application, the mounting groove and the conductive connecting piece are annular structures, so that the conduction can be realized in the entire circumferential direction, and the conduction area is increased.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] 1、The application adopts the structure of quick installation, does not need to install the joint on the long end cable, does not cause the semi-conductive material of the cable to enter the joint, reduces the joint failure, and improves the reliability of the joint.

[0026] 2、The application has short cable stripping length, saves the cable processing time, and reduces the cable waste.

[0027] 3、The application has reasonable scheme, simple structure, easy realization, small construction difficulty, low requirement on the technical level of the construction personnel, low installation failure rate, and improved installation efficiency.

[0028] 4、The application can reuse the original cable when replacing the cable joint, does not need to pretreat the cable again, saves the installation time, and improves the installation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a sectional view of the quick installation power cable joint of the application.

[0030] Figures 2-4 It is a sectional view of the quick installation power cable joint and the cable installation process of the application.

[0031] Figure 5 It is a partial sectional view of the conductive contact, the locking structure and the joint conductive part of the application.

[0032] Figure 6 It is an enlarged view of X in Figure 5 .

[0033] Figure 7 It is another state diagram of Figure 6 .

[0034] Figure 8 It is a front view of the half cylinder of the conductive contact of the application. DETAILED DESCRIPTION

[0035] In order for those skilled in the art to have a better understanding of the technical solutions of the application, the application will be further described below in combination with the embodiments and the drawings, but the implementation manners of the application are not limited to this.

[0036] Referring to Figures 1-4 , the quick installation power cable joint of the embodiment includes a joint body, a conductive contact 1 and a conductive connecting part 2; the joint body includes a reinforced insulation 3, a joint conductive part 4, a stress cone 5, a high-voltage shielding tube 6 and a joint insulation shielding 7, and the reinforced insulation 3, the joint conductive part 4, the stress cone 5, the high-voltage shielding tube 6 and the joint insulation shielding 7 are integrally formed.

[0037] In particular, the cable comprises a cable conductor 8, a cable insulation 9, a cable insulation shield 10, a cable metal sheath 11 and a cable outer sheath 12.

[0038] Referring to Figures 1-4 , the joint conductive part 4 is embedded in the inner hole of the high-voltage shielding tube 6, and the two ends of the joint conductive part 4 are respectively provided with conductive mounting holes for mounting the conductive contact 1; the conductive contact 1 is provided with two and is respectively connected with the end of the cable conductor 8, and the outer surface of each conductive contact 1 is provided with a mounting groove 1-1; the conductive connecting part 2 is provided with two and is respectively mounted in the corresponding mounting groove 1-1, and in the mounting state, the conductive connecting part 2 realizes the electrical connection of the joint conductive part 4 and the conductive contact 1.

[0039] Referring to Figures 1-4 , the conductive mounting hole is of a structure of small inside and large outside, which includes a first hole site 4-1 with larger size and a second hole site 4-2 with smaller size; the conductive contact 1 includes a first mounting part and a second mounting part, the first mounting part is located in the first hole site 4-1, and the second mounting part is located in the second hole site 4-2; the first hole site 4-1 and the second hole site 4-2 are provided with a positioning surface 4-3 for positioning the first mounting part. In this way, the conductive contact 1 can be positioned during installation, avoiding the stress cone 5 from being overlapped with the cable insulation shield 10 due to the overlong insertion of the cable into the joint body.

[0040] Further, the first mounting part is fixedly connected with the end of the cable conductor 8, and the second mounting part is provided with the mounting groove 1-1.

[0041] Further, the first mounting part and the second mounting part are both provided with a chamfer structure, and a round corner structure is provided at the boundary of the chamfer structure. In this way, a guide head can be used during installation, without the need for additional installation guide heads, and the joint body will not be scratched.

[0042] Referring to Figures 5-8 , the conductive contact 1 is fixedly connected with the joint conductive part 4 through a locking structure, and the locking structure is provided with at least two groups and is uniformly arranged along the circumferential direction; each group of locking structure includes a locking block 13, a locking driving assembly for driving the locking block 13 to be inserted between the conductive contact 1 and the joint conductive part 4, and a locking assembly for locking the power of the locking driving assembly.

[0043] Further, an inner wall of the second hole position 4-2 of the joint conductive piece 4 is provided with an annular clamping groove 4-4; the conductive contact 1 is provided with a sliding installation hole 1-2 and a lock hole 1-3; in a non-installed state, one end of the locking block 13 is located in the lock hole 1-3, and the other end of the locking block 13 is located in the sliding installation hole 1-2; in an installed state, one end of the locking block 13 is located in the annular clamping groove 4-4, and the other end of the locking block 13 is located in the lock hole 1-3. Specifically, the conductive contact 1 is formed by locking two half columns.

[0044] Further, the locking driving assembly is arranged in the sliding installation hole 1-2, the locking driving assembly comprises a locking driving spring 14 and a locking driving block 15, two ends of the locking driving spring 14 are respectively abutted against the locking driving block 15 and the hole wall of the sliding installation hole 1-2, and the locking driving block 15 is provided with a first extrusion inclined surface, and the locking block 13 is provided with a second extrusion inclined surface matched with the first extrusion inclined surface.

[0045] Further, the conductive contact 1 is further provided with a locking installation hole 1-4 and an avoiding hole 1-5, the locking assembly is arranged in the locking installation hole 1-4, the locking assembly comprises a locking swing piece 16 and a locking elastic piece 17, the locking swing piece 16 is rotationally connected in the locking installation hole 1-4, and one end of the locking swing piece 16 is provided with an unlocking extrusion part 16-1, and the other end of the locking swing piece 16 is provided with a locking part 16-2; the locking driving block 15 is provided with a locking groove 15-1 matched with the locking part 16-2; in a locked state, one end of the unlocking extrusion part 16-1 extends to the side surface of the first installation part corresponding to the positioning surface 4-3 outside through the avoiding hole 1-5, and one end of the locking part 16-2 extends to the locking groove 15-1; two ends of the locking elastic piece 17 are abutted against the hole wall of the locking installation hole 1-4 and the locking swing piece 16.

[0046] By the above structure, during the process of inserting the conductive contact 1 into the conductive mounting hole, the unlocking extrusion part 16-1 of the locking swing part 16 gradually approaches the positioning surface 4-3 of the joint conductive part 4, when the unlocking extrusion part 16-1 of the locking swing part 16 contacts with the positioning surface 4-3 of the joint conductive part 4, the positioning surface 4-3 will extrude the unlocking extrusion part 16-1 of the locking swing part 16 backward, at this time, the locking swing part 16 swings, so that the locking part 16-2 of the locking swing part 16 is out of the locking groove 15-1 of the locking driving block 15, the locking of the locking driving block 15 is released, at this time, the lock hole 1-3 of the conductive contact 1 is just communicated with the annular clamping groove 4-4 of the joint conductive part 4; the potential energy of the locking driving spring 14 is released instantaneously, the locking driving block 15 is pushed to move forward, the locking block 13 is driven by the first extrusion inclined surface of the locking driving block 15 to move in the direction away from the sliding mounting hole 1-2, so that one end of the locking block 13 is inserted into the annular clamping groove 4-4 of the joint conductive part 4, like Figure 7 , so as to complete the locking operation and realize the fixation between the cable and the joint, which will not be easily loosened.

[0047] Further, the locking driving block 15 is further provided with a supporting plane for supporting the locking block 13, and the supporting plane is located at the top of the first extrusion inclined surface. In this way, when the locking block 13 enters the annular clamping groove 4-4, the locking block 13 is limited and supported by the locking driving block 15 of the supporting plane, so as to prevent the locking block 13 from automatically exiting the annular clamping groove 4-4, thereby stably connecting the cable and the joint together.

[0048] Further, the conductive contact 1 is further provided with a spring mounting hole 1-6, and the spring mounting hole 1-6 is provided with an anti-falling spring 18, and the two ends of the anti-falling spring 18 are respectively abutted against the inner bottom surface of the spring mounting hole 1-6 and the side surface of the locking block 13. In this way, when the locking block 13 is located below, the anti-falling spring 18 can elastically limit the locking block 13 in the lock hole 1-3, so as to prevent the locking block 13 from falling downward.

[0049] Further, the conductive contact 1 and the joint conductive part 4 are gap-fitted.

[0050] Further, the conductive connecting part 2 is a hollow elastic structure, and in the non-installed state, the outer diameter of the conductive connecting part 2 is greater than the inner diameter of the second hole 4-2. By the above structure, when the conductive contact 1 is inserted into the conductive mounting hole of the joint conductive part 4, the conductive connecting part 2 will be self-adapted to the hole wall of the conductive mounting hole, so as to fully conduct between the conductive contact 1 and the joint conductive part 4, thereby ensuring smooth power transmission.

[0051] Further, the mounting groove 1-1 and the conductive connecting part 2 are annular structures, so that the conduction can be realized in the entire circumferential direction, and the conduction area is increased.

[0052] Referring to Figures 1-4 The working principle of the quick installation power cable joint of the embodiment is as follows:

[0053] During installation, the conductive contact 1 is connected with the cable in an integrated manner through crimping or screw locking, so as to ensure that the contact resistance is not higher than the body resistance of the cable conductor 8.

[0054] First, the cable with the conductive contact 1 installed at one end is inserted into the joint body, and when the positioning surface 4-3 on the conductive contact 1 contacts the joint conductive part 4 in the high-voltage shielding tube 6, the cable is in place. Then, the cable with the conductive contact 1 installed at the other end is inserted into the joint body, and the joint body does not need to be installed on the cable with the stripped length at one end being greater than the length of the joint body. After the cable conductors 8 at both ends are connected, the joint body is pulled back to the center of the cable conductor 8 connection. Therefore, the cable can be stripped for a shorter length, the cable stripping length is saved, and the cable processing time is shortened. At the same time, the cable is inserted into the joint body for a length of only half the length of the joint body, which not only greatly reduces the risk of joint breakdown caused by sticking of conductive particles on the outer shield of the cable, but also reduces the total friction resistance during installation and facilitates quick installation.

[0055] The cable conductors 8 at both ends are connected through the conductive connecting part 2 on the conductive contact 1 and the joint conductive part 4 in the high-voltage shielding tube 6 (one side of the conductive connecting part 2 contacts the conductive contact 1, and the other side contacts the joint conductive part 4), so as to achieve electrical connection of the cable conductors 8 at both ends.

[0056] The above is the preferred embodiment of the present application, but the embodiment of the present application is not limited by the above content, and any change, modification, substitution, combination, simplification made without departing from the spirit and principles of the present application should be an equivalent replacement method, which is included in the protection scope of the present application.

Claims

1. A quick installation power cable connector, characterized in that: The invention comprises a connector body, a conductive contact and a conductive connector; the connector body comprises reinforced insulation, a semi-conductive stress cone, a connector insulation shield, a high-voltage shielding tube and a connector conductive member, the high-voltage shielding tube is arranged in the inner cavity of the reinforced insulation, the connector conductive member is embedded in the high-voltage shielding tube, and both ends of the connector conductive member are respectively provided with conductive mounting holes for mounting the conductive contacts; the conductive contacts are provided with two and are respectively connected to the ends of the cable conductors at both ends, and the outer surface of each conductive contact is provided with a mounting groove; the conductive connectors are provided with two and are respectively installed in the corresponding mounting grooves, and in the installed state, the conductive connector realizes electrical connection between the connector conductive member and the conductive contact; The conductive mounting hole has a structure that is smaller inside and larger outside, and includes a first hole position with a larger size and a second hole position with a smaller size; the conductive contact includes a first mounting portion and a second mounting portion, the first mounting portion is located in the first hole position, and the second mounting portion is located in the second hole position; The conductive contact is fixedly connected to the connector conductive member via a locking structure, the locking structure comprising a locking block, a locking drive assembly for driving the locking block to be inserted between the conductive contact and the connector conductive member, and a locking assembly for locking the power of the locking drive assembly; An annular groove is provided on the inner wall of the second hole of the connector conductive member; a sliding mounting hole and a locking hole are provided on the conductive contact; in a non-installed state, one end of the locking block is located in the locking hole, and the other end of the locking block is located in the sliding mounting hole; in an installed state, one end of the locking block is located in the annular groove, and the other end of the locking block is located in the locking hole; The locking drive assembly is arranged in the sliding mounting hole, and the locking drive assembly includes a locking drive spring and a locking drive block. The two ends of the locking drive spring are respectively pressed against the locking drive block and the hole wall of the sliding mounting hole. The locking drive block is provided with a first extrusion inclined surface, and the locking block is provided with a second extrusion inclined surface that cooperates with the first extrusion inclined surface.

2. The quick installation power cable connector according to claim 1, characterized in that: A positioning surface for positioning the first mounting portion is provided between the first hole position and the second hole position; The first mounting portion is fixedly connected to the end of the cable conductor, and the second mounting portion is provided with the mounting groove.

3. The quick installation power cable connector according to claim 1, characterized in that: The conductive contact is also provided with a locking mounting hole and an avoidance hole, and the locking assembly is arranged in the locking mounting hole, and the locking assembly includes a locking swinging piece and a locking elastic piece, and the locking swinging piece is rotatably connected in the locking mounting hole, with the rotation center as the boundary, one end of the locking swinging piece is provided with an unlocking extrusion part, and the other end of the locking swinging piece is provided with a locking part; the locking drive block is provided with a locking groove that cooperates with the locking part; in the locked state, one end of the unlocking extrusion part extends through the avoidance hole to the outside of the side surface of the first mounting part corresponding to the positioning surface, and one end of the locking part extends to the locking groove; the two ends of the locking elastic piece are tightly pressed between the hole wall of the locking mounting hole and the locking swinging piece.

4. The quick installation power cable connector according to claim 1, characterized in that: The locking drive block is further provided with a support plane for supporting the locking block, and the support plane is located on the top of the first extrusion inclined surface.

5. The quick installation power cable connector according to claim 1, characterized in that: The conductive contact is also provided with a spring mounting hole, in which an anti-drop spring is provided. The two ends of the anti-drop spring are respectively pressed against the inner bottom surface of the spring mounting hole and the side surface of the locking block.

6. The quick installation power cable connector according to claim 1, characterized in that: There is a clearance fit between the conductive contact and the connector conductive member; the conductive connector is a hollow elastic structure, and in a non-installed state, the outer diameter of the conductive connector is larger than the inner diameter of the second hole.

7. The quick installation power cable connector according to claim 1, characterized in that: The installation groove and the conductive connecting piece are both annular structures.

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