A cable discharge combined grounding device

Abstract

The present invention discloses a cable discharge combined grounding device, which relates to the technical field of grounding devices, including a plum blossom contact and a conductor, wherein the plum blossom contact includes a contact arm and a plurality of contact pieces, each contact piece is provided with a guide groove, each guide groove includes a connected straight groove and a circular arc groove, the length direction of the straight groove is parallel to the axial direction of the contact arm and the straight groove is open at one end away from the circular arc groove, the arc center of the circular arc groove is located on the rotation axis of the corresponding contact piece, a sliding sleeve is provided along the axial sliding sleeve of the contact arm, a circular ring is fixedly connected to the sliding sleeve, and the circular ring is slidably matched with the guide groove on each contact piece at the same time, and the elastic unit restores the deformation process to drive the circular ring to be located in the straight groove. The present invention ensures that the plum blossom contact and the plug-in column are convenient to plug and unplug, and can also ensure that when the grounded wire is accidentally stepped on or pulled during electrical work, or when the wire is shaken by strong wind, the plum blossom contact and the plug-in column will not loosen or even detach, thereby ensuring a good grounding condition and improving the safety of electrical work.

Description

Technical Field

[0001] The invention relates to the technical field of grounding devices, in particular to a cable discharge combined grounding device. Background Art

[0002] The city's planning will replace overhead high-voltage lines with underground high-voltage cables. As the number of kilometers of cables increases exponentially, various cable branch boxes and substation one and two busbar containerized same-pole environmentally friendly cable switching devices are put into operation, and two-in-four-out or six-in-six-out switching devices are used for power distribution. When performing power outage tasks such as maintenance and line changes, there is still residual voltage after the cable is shut down. The power cable has a certain capacitance and has the characteristics of charging and discharging, which may cause the risk of electric shock. After the cable is shut down, the cable is discharged phase by phase, and the cable elbow is hung with ground wires in phases to ensure that the cable is connected to the ground to prevent residual charge from causing harm to the human body. These measures can minimize the risk of electric shock and ensure the safety of maintenance personnel.

[0003] For example, the patent with announcement number CN205693081U discloses a plum blossom contact type grounding device, which includes a plum blossom contact, a connecting rod, a grounding wire and an insulating operating rod. The plum blossom contact is clamped on the connecting rod, the middle of the connecting rod is connected to the grounding wire, a guide rod is formed at the lower end of the connecting rod, two clamping posts are symmetrically arranged on the guide rod and a spring is set, the spring is located below the clamping post, a step hole is formed at the upper end of the insulating operating rod, the guide rod can be inserted into the step hole, the upper end of the spring is fixed on the guide rod, and the lower end is on the step, and two L-shaped clamping grooves are also provided on the outer wall of the upper end of the insulating operating rod, and the two clamping posts can be clamped in the corresponding L-shaped clamping grooves respectively under the compression of the spring. It can make the connection with the electrical equipment tight and reliable, will not fall off at will to cause accidents, can be installed and disassembled in a plug-in manner, and the operation process is simple, fast and convenient.

[0004] In the prior art such as the above-mentioned patent, the grounding device is conductively connected to the elbow of the cable through a plum blossom contact. Although the operation is quick and convenient, the plum blossom contact is only clamped and connected to the cable elbow by the elastic force of a ring spring. Electricians may accidentally step on or pull the grounding wire during operation, causing the plum blossom contact to detach from the cable elbow, or strong winds outdoors may cause the grounding wire to swing and loosen the plum blossom contact, posing a safety hazard. Summary of the invention

[0005] The object of the present invention is to provide a cable discharge combined grounding device to solve the deficiencies in the above-mentioned prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cable discharge combined grounding device, comprising a plum blossom contact and a conductor, the plum blossom contact comprising a contact arm and a plurality of contact pieces, each contact piece being bound to the contact arm by a plurality of annular tension springs so that each contact piece is rotatably embedded in a circular array on the circumferential side surface of the contact arm, and the conductor is electrically connected to the contact arm; a guide groove is provided on each contact piece, each guide groove comprises a connected straight groove and an arc groove, the length direction of the straight groove is parallel to the axial direction of the contact arm and the straight groove is open at one end away from the arc groove, and the arc center of the arc groove is located on the rotation axis of the corresponding contact piece; a sliding sleeve is provided on the contact arm along the axial sliding sleeve, a circular ring is fixedly connected to the sliding sleeve, and the circular ring is slidably matched with the guide groove on each contact piece at the same time; an elastic unit is provided between the contact arm and the sliding sleeve, and the process of the elastic unit restoring deformation drives the circular ring to be located in the straight groove.

[0007] Furthermore, a first sliding groove is provided on the sliding sleeve along the axial direction, and a protrusion is provided on the peripheral side surface of the contact arm, and the protrusion is slidably arranged in the first sliding groove.

[0008] Furthermore, the elastic unit includes: a second slide groove, which is opened on the peripheral side surface of the contact arm along the axial direction of the contact arm; two slip rings, which are both slidably mounted on the contact arm, and the two slip rings are respectively fixedly connected with sliders, and the two sliders are both located in the second slide groove; a compression spring, which is movably mounted on the contact arm, and each of its two ends abuts against a slip ring; two protrusions, which are both fixedly connected to the inner wall of the sliding sleeve, and the spacing between the two protrusions along the axial direction of the contact arm is equal to the length of the second slide groove, and the two slip rings are located between the two protrusions.

[0009] Furthermore, the convex portion is in an inner ring shape, and its inner diameter is smaller than the outer diameter of the slip ring.

[0010] Furthermore, an annular shell is fixedly connected to the sliding sleeve, and the annular shell covers each contact piece and each annular tension spring.

[0011] Furthermore, the elastic unit includes: a through hole, which is opened on the sliding sleeve; a tension spring, one end of which is hooked on a pin on the inner wall of the annular shell; a rope, which movably passes through the through hole, one end of the rope is connected to the contact arm, and the other end of the rope is connected to the other end of the tension spring.

[0012] Furthermore, the sliding sleeve is an insulator, and an insulating rubber sleeve is sleeved on the peripheral side thereof.

[0013] Furthermore, a limit nut is threaded on the contact arm, and there is a limit position during the screwing process of the limit nut. At the limit position, the end of the sliding sleeve abuts against the end face of the limit nut, and the circular ring is located in the circular arc groove.

[0014] Furthermore, a plurality of arcuate grooves distributed in a circular array are provided on the circumferential side surface of the contact arm, and each contact piece has a plurality of arcuate supporting parts, the thickness of the arcuate grooves is adapted to the thickness of the contact piece, and the arcuate supporting parts of each contact piece are rotatably embedded in each arcuate groove one by one.

[0015] In the above technical scheme, the present invention provides a cable discharge combined grounding device. In the process of the electrician holding the sliding sleeve to insert the plum blossom contact into the elbow of the phase-splitting cable to be discharged, each contact piece of the plum blossom contact will first abut against the plug-in post of the elbow, and then the sliding sleeve slides relative to the contact arm, causing the elastic unit to undergo elastic deformation and store energy, and at the same time causing the ring to slide from the straight groove into the entrance of the arc groove, and then each contact piece will open under the squeezing of the plug-in post, and the plum blossom contact and the plug-in post will be plugged together. After each contact piece passes over the thick part on the plug-in post, it will close again under the elastic force of the annular tension spring to achieve plug-in clamping of the plug-in post. After the electrician releases the sliding sleeve, the elastic force of the elastic unit is released to cause the sliding sleeve to slide in the opposite direction relative to the contact arm, thereby causing the ring to reset to the straight groove again, and then making it impossible for each contact piece to rotate relative to the contact arm even under the action of external force, and each contact piece is locked. Therefore, even if the grounded wire is accidentally stepped on or pulled during electrician work, the plum blossom contact will not be pulled out of the plug-in post. When the discharge operation is completed and the plum blossom contact needs to be pulled out normally, the electrician only needs to hold the sliding sleeve again and pull it away from the plug-in post. The sliding sleeve slides relative to the contact arm, causing the elastic unit to deform and store energy again, while causing the ring to slide out from the opening of the straight groove. The ring no longer restricts the rotation of the contact pieces, and the electrician can smoothly pull the plum blossom contact out of the plug-in post.

[0016] The present invention ensures that the plum blossom contact and the plug-in post are easy to plug and unplug, and can also ensure that when the grounded wire is accidentally stepped on or pulled, or when the wire is swayed by strong wind during electrical work, the plum blossom contact and the elbow of the cable will not loosen or even fall off, thereby ensuring a good grounding condition and improving the safety of electrical work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the structure provided by an embodiment of the present invention;

[0019] Figure 2 A structural cross-section diagram provided for an embodiment of the present invention Figure I ;

[0020] Figure 3A schematic diagram of the structure of a contact sheet provided by an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the structure of a contact arm and an elastic unit provided in an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the structure of a sleeve and a ring provided in an embodiment of the present invention;

[0023] Figure 6 A structural cross-section diagram provided for an embodiment of the present invention Figure II ;

[0024] Figure 7 A structural cross-sectional view of another embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1. contact arm; 101. arc-shaped groove; 2. contact piece; 21. arc-shaped support part; 3. annular tension spring; 4. wire; 5. guide groove; 51. straight groove; 52. arc groove; 6. sliding sleeve; 7. first sliding groove; 8. round head bolt; 9. connecting rod; 10. circular ring; 11. elastic unit; 111. second sliding groove; 112. slip ring; 113. slider; 114. compression spring; 115. protrusion; 116. through hole; 117. rope; 118. tension spring; 12. annular shell; 13. insulating rubber sleeve; 14. limit nut. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] See also Figure 1-Figure 7A cable discharge combined grounding device provided by an embodiment of the present invention comprises a discharge part and a grounding part. For a group of phase cables, the elbow of the phase-separated cable needs to be discharged through the discharge part first. After the discharge is completed, the elbow of the cable is removed from the cable, and then the grounding part is connected to the back of the cable nose to keep the cable grounded. The elbow or cable can be repaired and replaced later. The discharge part comprises a plum blossom contact, and the plum blossom contact comprises a contact arm 1 and a plurality of contact pieces 2. Each contact piece 2 is composed of two sheet-like monomers bonded together. The contact arm 1 is composed of a plurality of arc-shaped grooves 101 distributed in a circumferential array on the circumferential side surface, and each contact piece 2 has a plurality of arc-shaped support parts 21, the thickness of the arc-shaped groove 101 is adapted to the thickness of the contact piece 2, and the arc-shaped support parts 21 of each contact piece 2 are rotated and embedded in each arc-shaped groove 101 one by one, and then bound by four annular tension springs 3, so that each contact piece 2 is rotated and embedded in the circumferential side surface of the contact arm 1 in a circumferential array, and the elastic force of the annular tension spring 3 keeps each contact piece 2 in a closing trend. One end of the contact arm 1 is electrically connected to one end of the wire 4, and the other end of the wire 4 is connected to the ground wire row or the shell of the nearby grounding device.

[0029] One end of each contact piece 2 has a trapezoidal protrusion structure for clamping the plug-in post of the cable to be discharged. A guide groove 5 is provided on the other end of each contact piece 2. The arc-shaped support portion 21 is located between the trapezoidal protrusion structure and the guide groove 5. Each guide groove 5 includes a connected straight groove 51 and a circular arc groove 52. The straight groove 51 is farther away from the trapezoidal protrusion structure than the circular arc groove 52. The length direction of the straight groove 51 is parallel to the axial direction of the contact arm 1 and the straight groove 51 is open at one end away from the circular arc groove 52. The arc center of the circular arc groove 52 is located on the rotation axis of the arc-shaped support portion 21 of the corresponding contact piece 2 and the arc-shaped groove 101.

[0030] A sliding sleeve 6 is provided on the contact arm 1 along the axial sliding sleeve. Specifically, a first sliding groove 7 is provided on the sliding sleeve 6 along the axial direction. A round head bolt 8 is radially screwed on the circumferential side surface of the contact arm 1. The nut of the round head bolt 8 is slidably arranged in the first sliding groove 7. The width of the nut of the round head bolt 8 is adapted to the width of the first sliding groove 7. Through the cooperation of the round head bolt 8 and the first sliding groove 7, the circumferential rotation of the sliding sleeve 6 relative to the contact arm 1 can be limited on the one hand, and the axial sliding stroke of the sliding sleeve 6 relative to the contact arm 1 can be limited on the other hand. The sliding sleeve 6 is made of insulating material, and an insulating rubber sleeve 13, such as a rubber sleeve or a plastic sleeve, is provided on the circumferential side surface of the sliding sleeve 6. A circular ring 10 is fixedly connected to the sliding sleeve 6 through a plurality of connecting rods 9. The circular ring 10 is slidably matched with the guide groove 5 on each contact piece 2 at the same time. The circular ring 10 is in contact with both side walls of the guide groove 5. For example, if the cross section of the circular ring 10 is a circular structure, the diameter of the circular structure is equal to or slightly smaller than the width of the guide groove 5. An annular shell 12 is also welded or glued to the sliding sleeve 6 . The annular shell 12 can cover each contact piece 2 and each annular tension spring 3 to play a role of isolation and protection.

[0031] An elastic unit 11 is provided between the contact arm 1 and the sleeve 6. The configuration requirement of the elastic unit 11 is that the process of restoring its deformation drives the ring 10 to be located in the straight groove 51. That is to say, no matter whether the ring 10 slides into the arc groove 52 or slides out from the opening of the straight groove 51, the elastic force of the elastic unit 11 can restore the ring 10 to the straight groove 51 when it is released.

[0032] Specifically, in one embodiment of the specific structure of the elastic unit 11, refer to Figure 2 , Figure 4 , Figure 6 The elastic unit 11 includes a compression spring 114, two slip rings 112, two protrusions 115 and a second slide groove 111. The second slide groove 111 is opened on the peripheral side of the contact arm 1 along the axial direction of the contact arm 1. The two slip rings 112 are slidably sleeved on the contact arm 1. Slide blocks 113 are fixedly connected to the inner walls of the two slip rings 112 respectively. The two slide blocks 113 slide in the second slide groove 111. The compression spring 114 is movably sleeved on the contact arm 1. The two ends of the compression spring 114 respectively abut against a slip ring 112. When the elastic force of the compression spring 114 is released, the two slip rings 112 are bounced open until the two slide blocks 113 respectively abut against the two ends of the second slide groove 111. The two protrusions 115 are welded to the inner wall of the sliding sleeve 6, or the two protrusions 115 are integrally formed with the sliding sleeve 6. The spacing of the two protrusions 115 along the axial direction of the contact arm 1 is equal to the length of the second slide groove 111. The two slip rings 112 are located between the two protrusions 115. The convex portion 115 is in an inner ring shape, and its inner diameter is smaller than the outer diameter of the slip ring 112; or the convex portion 115 is in a block shape.

[0033] In this embodiment, initially, Figure 2 When the electrician holds the sliding sleeve 6 to insert the plum blossom contact into the plug-in post of the cable to be discharged, the contact pieces 2 of the plum blossom contact will first abut against the plug-in post, and then the sliding sleeve 6 slides to the right side (the side close to the plug-in post) relative to the contact arm 1. On the one hand, the sliding sleeve 6 squeezes the slip ring 112 on the left side through the convex portion 115 on the left side (the side close to the wire 4), so that the compression spring 114 is compressed to the right to store energy. On the other hand, the sliding sleeve 6 makes the ring 10 slide from the straight groove 51 into the entrance of the arc groove 52, and the ring 10 no longer restricts the rotation of the contact pieces 2. Figure 6, and then each contact piece 2 will open under the pressure of the plug-in post, and the plum blossom contact will be plugged into the plug-in post. After each contact piece 2 passes over the thick part on the plug-in post, it will close again under the elastic force of the annular tension spring 3 to achieve the plug-in clamping of the plug-in post. After that, when the electrician loosens the sliding sleeve 6, the elastic force of the compression spring 114 is released, and the convex part 115 on the left is squeezed by the slip ring 112 on the left, so that the sliding sleeve 6 slides to the left relative to the contact arm 1, so that the ring 10 is reset to the straight groove 51 again, and then the contact pieces 2 cannot rotate relative to the contact arm 1 even under the action of external force, and the contact pieces 2 are locked. Therefore, even if the grounded wire 4 is accidentally stepped on or pulled during electrical work, the plum blossom contact will not be pulled out of the plug-in post.

[0034] After the plum blossom contact is connected to the elbow, the phase cable is discharged, and the discharge time is 5-10 minutes. After the discharge operation is completed, when the plum blossom contact needs to be pulled out normally, the electrician only needs to hold the sliding sleeve 6 again and pull the sliding sleeve 6 away from the plug-in column. The sliding sleeve 6 slides to the left relative to the contact arm 1. On the one hand, the sliding sleeve 6 squeezes the slip ring 112 on the right side through the convex part 115 on the right side, so that the compression spring 114 is compressed to the left to store energy. On the other hand, the sliding sleeve 6 makes the ring 10 slide out from the opening of the straight groove 51, and the ring 10 no longer restricts the rotation of each contact piece 2. Each contact piece 2 can rotate and make way under the squeezing of the thick part of the plug-in column, and the electrician can smoothly pull the plum blossom contact out of the plug-in column.

[0035] In another embodiment of the specific structure of the elastic unit 11, refer to Figure 7 The elastic unit 11 includes a tension spring 118 and a rope 117. The tension spring 118 is tightly attached to the inner wall of the annular housing 12. One end of the tension spring 118 is hooked on a pin on the inner wall of the annular housing 12, and the other end is connected to one end of the rope 117. After the rope 117 is movably passed through the through hole 116 provided on the sliding sleeve 6, the other end of the rope 117 is connected to the contact arm 1. The connection point between the rope 117 and the contact arm 1 is opposite to the through hole 116. Both ends of the through hole 116 are chamfered to make the mouth of the through hole 116 smooth and reduce the wear on the rope 117. The rope 117 can be made of wear-resistant nylon rope or steel wire rope.

[0036] In this embodiment, no matter the sleeve 6 slides to the left or to the right relative to the contact arm 1, that is, the corresponding ring 10 slides out of the opening of the straight groove 51 or slides into the arc groove 52, the rope 117 will be pulled through the through hole 116, so that the tension spring 118 is stretched and energy is stored. When the external force on the sleeve 6 is removed, the tension spring 118 restores its deformation and releases elastic potential energy, thereby pulling the sleeve 6 to slide back to its original position through the rope 117, so that the ring 10 slides back to the straight groove 51 of the guide groove 5, thereby limiting the rotation of each contact piece 2.

[0037] In a preferred technical solution provided by the present invention, the contact arm 1 can adopt an integrated structure or a split structure. A section of the peripheral side surface of the contact arm 1 close to the wire 4 is provided with a thread, and a limit nut 14 is screwed to the contact arm 1 through the thread. The limit nut 14 has a limit position during the screwing process. When it is at the limit position, Figure 6 , the end of the sleeve 6 abuts against the end face of the limit nut 14, and the ring 10 is located in the arc groove 52. Usually, the limit nut 14 is far away from the limit position. When there is no external force acting on the sleeve 6, the elastic force of the elastic unit 11 keeps the ring 10 in the straight groove 51 to prevent the contact pieces 2 from rotating and opening, so that the plum blossom contact can be prevented from being separated from the plug-in column when the wire 4 is accidentally stepped on or pulled. However, in some special operating scenarios, within the scope allowed by the operating specifications, it is required to retain the function of the electrician to actively pull the wire 4 to achieve the separation of the plum blossom contact, for example, due to the limitation of the workplace, it is difficult for the electrician to hold the sleeve 6, or the temporary transfer line of the present invention as a test circuit needs to retain the emergency circuit disconnection function, etc., the electrician can screw the limit screw to the limit position in advance, and the limit nut 14 squeezes the sleeve 6 by overcoming the elastic force of the elastic unit 11, so that the ring 10 is always kept in the circular groove, and the plum blossom contact can be quickly separated by actively pulling the wire 4 in an emergency.

[0038] The grounding part (not shown in the figure) of the cable discharge combined grounding device provided by the present invention is used after the phase-separated cable discharge is completed, and is mainly composed of a spring clamp and a grounding wire. One end of the grounding wire is connected to the ground wire row, and the other end is connected to the spring clamp. The spring clamp can be clamped behind the cable nose, so that the cable can be continuously grounded during subsequent operations.

[0039] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A cable discharge combined grounding device, comprising a plum blossom contact and a conductor, wherein the plum blossom contact comprises a contact arm and a plurality of contact pieces, each contact piece is bound to the contact arm by a plurality of annular tension springs so that each contact piece is rotatably embedded in a circumferential array on the circumferential side surface of the contact arm, and the conductor is electrically connected to the contact arm; characterized in that: Each contact piece is provided with a guide groove, each guide groove comprises a connected straight groove and a circular arc groove, the length direction of the straight groove is parallel to the axial direction of the contact arm and the straight groove is open at one end away from the circular arc groove, and the arc center of the circular arc groove is located on the rotation axis of the corresponding contact piece; The contact arm is provided with a sliding sleeve along the axial sliding sleeve, and a circular ring is fixedly connected to the sliding sleeve, and the circular ring is slidably matched with the guide groove on each contact piece at the same time; An elastic unit is arranged between the contact arm and the sliding sleeve, and the elastic unit drives the ring to be located in the straight groove during the process of restoring the deformation.

2. A cable discharge combined grounding device according to claim 1, characterized in that: The sliding sleeve is provided with a first sliding groove in the axial direction, and a protrusion is provided on the peripheral side surface of the contact arm, and the protrusion is slidably arranged in the first sliding groove.

3. A cable discharge combined grounding device according to claim 1, characterized in that: The elastic unit comprises: A second sliding groove is provided on the peripheral side surface of the contact arm along the axial direction of the contact arm; Two slip rings, both of which are slidably sleeved on the contact arm, and the two slip rings are respectively fixedly connected with sliders, and the two sliders are both located in the second slide groove; A compression spring is movably sleeved on the contact arm, and each of its two ends abuts against a slip ring; The two protrusions are fixedly connected to the inner wall of the sliding sleeve, the spacing between the two protrusions along the axial direction of the contact arm is equal to the length of the second sliding groove, and the two slip rings are located between the two protrusions.

4. A cable discharge combined grounding device according to claim 3, characterized in that: The convex portion is in an inner ring shape, and its inner diameter is smaller than the outer diameter of the slip ring.

5. A cable discharge combined grounding device according to claim 1, characterized in that: The sliding sleeve is fixedly connected with an annular shell, which covers each contact piece and each annular tension spring.

6. A cable discharge combined grounding device according to claim 5, characterized in that: The elastic unit comprises: A through hole is provided on the sliding sleeve; A tension spring, one end of which is hooked on a pin on the inner wall of the annular housing; A rope movably passes through the through hole, one end of the rope is connected to the contact arm, and the other end of the rope is connected to the other end of the tension spring.

7. A cable discharge combined grounding device according to claim 1, characterized in that: The sliding sleeve is an insulator, and an insulating rubber sleeve is sleeved on the peripheral side surface of the sliding sleeve.

8. A cable discharge combined grounding device according to claim 1, characterized in that: The contact arm is threaded with a limit nut, and there is a limit position during the screwing process of the limit nut. At the limit position, the end of the sliding sleeve abuts against the end face of the limit nut, and the circular ring is located in the circular arc groove.

9. A cable discharge combined grounding device according to claim 1, characterized in that: The peripheral side surface of the contact arm is provided with a plurality of arc-shaped grooves distributed in a circumferential array, each contact piece has a plurality of arc-shaped supporting parts, the thickness of the arc-shaped groove is adapted to the thickness of the contact piece, and the arc-shaped supporting parts of each contact piece are rotatably embedded in each arc-shaped groove one by one.

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