Epoxy resin insulation tubular busbar cold contraction type insulation intermediate joint

Abstract

The invention provides an epoxy resin insulation tubular busbar cold contraction type insulation intermediate joint, and relates to the technical field of cable accessories. The epoxy resin insulation tubular busbar cold contraction type insulation intermediate joint is used for connecting a first wire and a second wire, the first wire comprises a first conductor and a first insulation layer wrapping the first conductor, and the second wire comprises a second conductor and a second insulation layer wrapping the second conductor; the epoxy resin insulation tubular busbar cold contraction type insulation intermediate joint comprises a cold contraction insulation joint and a net-shaped sealing piece, and the cold contraction insulation joint is arranged at the joint of a first wire and a second wire in a sleeving manner; the net-shaped sealing element is fixed in the cold shrinkage insulation joint, and a plurality of solute holes are formed in the net-shaped sealing element. When the epoxy resin insulation tubular bus cold shrinkage type insulation intermediate joint is used, silicone grease at the lap joint of the cold shrinkage insulation joint and the insulation layer does not need to be manually removed, and air and water vapor can be prevented from invading at the extreme temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of cable accessories, and particularly to a cold-shrinkable insulating intermediate joint for an epoxy resin insulated tubular busbar. Background Art

[0002] A cold-shrinkable insulating intermediate joint is a component that uses an elastomer material to be injection-molded and vulcanized in a factory, and then expanded in diameter and lined with a support to form various cable accessories. During on-site installation, the cold-shrinkable insulating intermediate joint is sleeved on the processed cable joint, and the internal support is withdrawn, so that the cold-shrinkable insulating intermediate joint is pressed against the insulating layer of the cable. Before installing the cold-shrinkable insulating intermediate joint, an excessive amount of silicone grease needs to be applied to the insulating layer of the cable. When the cold-shrinkable insulating intermediate joint shrinks, the fluidity of the silicone grease causes it to carry the air and trace amounts of water vapor between the cold-shrinkable insulating intermediate joint and the cable insulating layer to move towards the end of the cold-shrinkable insulating intermediate joint, and finally be extruded, thereby eliminating the potential insulation hazard sources (local discharge caused by air, and electrochemical corrosion caused by water vapor).

[0003] In related technologies, for example, the reference document with the application number 201521077681.8 discloses a cold-shrinkable joint and a compensating conductor cable repair structure. After shrinking the cold-shrinkable joint body, it is necessary to manually wipe off the excess silicone grease at the overlapping part of the cold-shrinkable joint body and the cable insulating layer. Manually wiping off the excess silicone grease is not only relatively cumbersome in operation, but also causes waste of silicone grease. Moreover, at extreme temperatures, when the cold-shrinkable joint body and the cable insulating layer shrink inconsistently, it is difficult for the silicone grease between the cold-shrinkable joint body and the cable insulating layer alone to block the intrusion of air and water vapor, thus prone to safety hazards.

[0004] The information disclosed in the background art part of the present invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] Based on this, in view of the problems that currently, it is necessary to manually clean the silicone grease after the cold-shrinkable joint shrinks, and when the cold-shrinkable joint body and the cable insulating layer shrink inconsistently, air and water vapor are likely to invade, it is necessary to provide a cold-shrinkable insulating intermediate joint for an epoxy resin insulated tubular busbar.

[0006] The above object is achieved by the following technical solutions: An epoxy resin insulated tubular busbar cold-shrinkable insulation intermediate joint is used to connect a first wire and a second wire. The first wire includes a first conductor and a first insulating layer coated on the first conductor. The second wire includes a second conductor and a second insulating layer coated on the second conductor. The first conductor and the second conductor are connected, and silicone grease is applied on both the first insulating layer and the second insulating layer. The epoxy resin insulated tubular busbar cold-shrinkable insulation intermediate joint includes: A cold-shrinkable insulation joint sleeved at the connection of the first wire and the second wire; A mesh seal fixed inside the cold-shrinkable insulation joint and located between the cold-shrinkable insulation joint and the first insulating layer, or between the cold-shrinkable insulation joint and the second insulating layer. A plurality of solute holes are provided on the mesh seal; Wherein, when the cold-shrinkable insulation joint shrinks, it can squeeze the silicone grease on the first insulating layer and the second insulating layer to move towards the mesh seal. When the mesh seal moves towards the first insulating layer or the second insulating layer, the solute holes can accommodate the silicone grease.

[0007] In a possible implementation manner, the inside of the cold-shrinkable insulation joint has a communicating cavity and an adhesive cavity. The cavity corresponds to the connection of the first wire and the second wire, and the adhesive cavity corresponds to the first insulating layer or the second insulating layer. The mesh seal is fixed on the inner wall of the adhesive cavity.

[0008] In a possible implementation manner, the shape of the mesh seal is cylindrical, the shape of the adhesive cavity matches the shape of the mesh seal, and the axis lines of the mesh seal and the adhesive cavity are collinearly arranged.

[0009] In a possible implementation manner, the inner diameter of the adhesive cavity is smaller than the inner diameter of the cavity.

[0010] In a possible implementation manner, the cold-shrinkable insulation joint further includes a stress tube and two stress cones. The two stress cones are respectively arranged at both ends in the cavity. The stress tube is arranged in the cavity and located between the two stress cones. The stress tube corresponds to the connection of the first conductor and the second conductor.

[0011] In a possible implementation manner, the epoxy resin insulated tubular busbar cold-shrinkable insulation intermediate joint further includes a conductor joint. The conductor joint is arranged in the cavity and simultaneously coated on the first conductor and the second conductor. The outside of the conductor joint corresponds to the stress tube.

[0012] In a possible implementation, the epoxy resin insulated tubular busbar cold shrinkable insulation intermediate joint further includes a heat dissipation member, which is sleeved outside the first insulation layer or the second insulation layer and corresponds to the mesh seal.

[0013] In a possible implementation, the heat dissipation member includes a body and a plurality of heat dissipation fins. The body is sleeved outside the first insulation layer or the second insulation layer, and the plurality of heat dissipation fins are arranged at intervals in the circumferential direction outside the body.

[0014] In a possible implementation, the epoxy resin insulated tubular busbar cold shrinkable insulation intermediate joint further includes a joint metal shielding net, a joint waterproof tape and a heat shrinkable outer sheath. The joint metal shielding net is coated outside the cold shrinkable insulation joint, the joint waterproof tape is wound outside the joint metal shielding net, the heat shrinkable outer sheath is coated outside the joint waterproof tape, and the body is sleeved at one end of the heat shrinkable outer sheath.

[0015] In a possible implementation, the solute holes are diamond-shaped holes.

[0016] The beneficial effects of the present invention are as follows: The epoxy resin insulated tubular busbar cold shrinkable insulation intermediate joint provided by the present invention can achieve close contact with the first insulation layer and the second insulation layer when the cold shrinkable insulation joint shrinks, thereby squeezing the excess silicone grease between the first insulation layer and the cold shrinkable insulation joint, and between the second insulation layer and the cold shrinkable insulation joint to move towards the mesh seal. When the cold shrinkable insulation joint shrinks, it can also drive the mesh seal to move towards the first insulation layer or the second insulation layer. When the mesh seal abuts against the first insulation layer or the second insulation layer, the silicone grease can be received in the solute holes, thereby preventing the excess silicone grease from overflowing outside the cold shrinkable insulation joint, and further avoiding the manual cleaning of the silicone grease by the operator. When the mesh seal abuts against the first insulation layer or the second insulation layer, the solute holes at one end of the mesh seal close to the connection of the first conductor and the second conductor are filled with silicone grease, while only a small amount or none of the solute holes at the other end are filled with silicone grease. This enables the solute holes at the end of the mesh seal far from the connection of the first conductor and the second conductor to accommodate part of the intruding water vapor and air under extreme temperatures, and at the end of the mesh seal close to the connection of the first conductor and the second conductor, the silicone grease filled in its solute holes can further prevent the intrusion of air and water vapor. Description of the Drawings

[0017] Figure 1 Shows a three-dimensional structural schematic diagram of an epoxy resin insulated tubular busbar cold shrinkable insulation intermediate joint according to an embodiment of the present invention; Figure 2 Shows a partial exploded schematic diagram of an epoxy resin insulated tubular busbar cold shrinkable insulation intermediate joint according to an embodiment of the present invention; Figure 3 Shows a cross-sectional view of a cold-shrinkable insulating intermediate joint of an epoxy resin insulated tubular busbar according to an embodiment of the present invention; Figure 4 Shows Figure 3 A partial schematic diagram of; Figure 5 Shows an internal schematic diagram of a cold-shrinkable insulating joint according to an embodiment of the present invention; Figure 6 Shows a three-dimensional structural schematic diagram of a mesh seal according to an embodiment of the present invention; Figure 7 Shows a schematic diagram of the expansion of a mesh seal according to an embodiment of the present invention; Figure 8 Shows a three-dimensional structural schematic diagram of a heat dissipation member according to an embodiment of the present invention.

[0018] Wherein: 100, cold-shrinkable insulating intermediate joint of epoxy resin insulated tubular busbar; 110, cold-shrinkable insulating joint; 111, cavity; 112, bonding cavity; 113, stress tube; 114, stress cone; 120, mesh seal; 121, mesh strip; 122, node; 123, solute hole; 130, conductor joint; 140, joint metal shielding net; 150, joint waterproof tape; 160, heat-shrinkable outer sheath; 170, heat dissipation member; 171, body; 172, heat dissipation fin; 180, waterproof rubber strip; 200, first wire; 210, first conductor; 220, first insulating layer; 300, second wire; 310, second conductor; 320, second insulating layer; X, first direction; Y, second direction. Detailed implementation manners

[0019] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The serial numbers assigned to components in this text, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "coupling" as used in this invention, unless otherwise specifically stated, both include direct and indirect connection (coupling). In the description of this invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this invention.

[0021] In this invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0022] For easy understanding, the problems existing when using the existing cold shrinkable insulating intermediate joint are described in detail. Before the cold shrinkable insulating intermediate joint shrinks, it is necessary to apply an excessive amount of silicone grease on the insulating layer of the wire to ensure that the silicone grease moves outward when being squeezed by the cold shrinkable insulating intermediate joint, and the silicone grease can carry the moisture and air between the wire insulating layer and the cold shrinkable insulating intermediate joint outwards when moving outwards. However, the excessive silicone grease will overflow outside the cold shrinkable insulating intermediate joint, reaching the lap joint of the cold shrinkable insulating intermediate joint and the wire insulating layer. The operator needs to manually clean the overflowed silicone grease. The overflowed silicone grease not only causes waste, but also the operation of cleaning the silicone grease is rather cumbersome, which not only increases the workload of the operator, but also reduces the efficiency of wire connection.

[0023] At extreme temperatures, since the materials of the cold shrinkable insulating intermediate joint and the wire insulating layer are usually different, it leads to inconsistent shrinkage or expansion of the cold shrinkable insulating intermediate joint and the wire insulating layer, and further increases the gap between the cold shrinkable insulating intermediate joint and the wire insulating layer. Although the silicone grease can to a certain extent prevent the intrusion of moisture and air, the sealing effect is weak, resulting in an easy occurrence of electric breakdown phenomenon.

[0024] Please refer to Figure 1 and Figure 2, an embodiment of the present invention provides a cold - shrinkable insulation intermediate joint 100 for an epoxy resin insulated tubular busbar. The cold - shrinkable insulation intermediate joint 100 for an epoxy resin insulated tubular busbar is used to connect a first conductor 200 and a second conductor 300. The first conductor 200 includes a first conductor core 210 and a first insulation layer 220 coated on the first conductor core 210. The second conductor 300 includes a second conductor core 310 and a second insulation layer 320 coated on the second conductor core 310. The first conductor core 210 and the second conductor core 310 are connected together.

[0025] Both the first conductor 200 and the second conductor 300 are epoxy resin insulated tubular busbars, and both the first insulation layer 220 and the second insulation layer 320 are epoxy resin insulation layers. One end of the first conductor core 210 is exposed outside the first insulation layer 220, and one end of the second conductor core 310 is exposed outside the second insulation layer 320 to facilitate the connection between the first conductor core 210 and the second conductor core 310. Silicone grease is applied on the outer sides of both the first insulation layer 220 and the second insulation layer 320.

[0026] Please refer to Figure 2 , Figure 4 and Figure 6 , the cold - shrinkable insulation intermediate joint 100 for an epoxy resin insulated tubular busbar includes a cold - shrinkable insulation joint 110 and a mesh seal 120. The cold - shrinkable insulation joint 110 is sleeved on the connection part of the first conductor 200 and the second conductor 300. The mesh seal 120 is fixed inside the cold - shrinkable insulation joint 110, and the mesh seal 120 is located between the cold - shrinkable insulation joint 110 and the first insulation layer 220, or between the cold - shrinkable insulation joint 110 and the second insulation layer 320. A plurality of solute holes 123 are formed on the mesh seal 120.

[0027] When the cold-shrinkable insulation joint 110 shrinks, it can achieve close contact with the first insulation layer 220 and the second insulation layer 320, thereby squeezing the excess silicone grease between the first insulation layer 220 and the cold-shrinkable insulation joint 110, and between the second insulation layer 320 and the cold-shrinkable insulation joint 110 to move towards the mesh seal 120. When the cold-shrinkable insulation joint 110 shrinks, it can also drive the mesh seal 120 to move towards the first insulation layer 220 or the second insulation layer 320. When the mesh seal 120 abuts against the first insulation layer 220 or the second insulation layer 320, the silicone grease can be received in the solute holes 123, thereby preventing the excess silicone grease from overflowing outside the cold-shrinkable insulation joint 110, and further avoiding the need for operators to manually clean the silicone grease. When the mesh seal 120 abuts against the first insulation layer 220 or the second insulation layer 320, the solute holes 123 at one end of the mesh seal 120 close to the connection of the first conductor 210 and the second conductor 310 are filled with silicone grease, while only a small amount or none of the solute holes 123 at the other end are filled with silicone grease. This enables the solute holes 123 at the end of the mesh seal 120 far from the connection of the first conductor 210 and the second conductor 310 to accommodate some of the invading water vapor and air at extreme temperatures, and at the end of the mesh seal 120 close to the connection of the first conductor 210 and the second conductor 310, the silicone grease filled in its solute holes 123 can further prevent the invasion of air and water vapor.

[0028] The silicone grease is mostly in a full state in the solute holes 123 at one end of the mesh seal 120 close to the connection of the first conductor 210 and the second conductor 310, so it has a certain positive pressure effect, thereby effectively reducing the gap between the cold-shrinkable insulation joint 110 and the insulation layer. Combining with the hydrophobicity of the silicone grease itself, it further avoids the invasion of air and water vapor.

[0029] It should be noted that after the cold-shrinkable insulation joint 110 shrinks, there are still silicone grease films between the cold-shrinkable insulation joint 110 and the first insulation layer 220, and between the cold-shrinkable insulation joint 110 and the second insulation layer 320. After the cold-shrinkable insulation joint 110 shrinks, not all of the silicone grease will be squeezed to the mesh seal 120.

[0030] Please refer to Figure 2 and Figure 4 , define the axial direction of the cold-shrinkable insulation joint 110 as the first direction X. The extension directions of the first conductor 210, the first insulation layer 220, the second conductor 310, and the second insulation layer 320 are all parallel to the first direction X.

[0031] Please refer to Figures 1 to 4, in some embodiments, a mesh seal 120 is disposed between the cold - shrinkable insulation joint 110 and the first insulation layer 220. When the cold - shrinkable insulation joint 110 shrinks, the internal support (not shown in the figure) is gradually withdrawn from the end of the cold - shrinkable insulation joint 110 far from the first wire 200. Thus, the cold - shrinkable insulation joint 110 gradually shrinks from the end near the second wire 300 towards the end near the first wire 200. As a result, the silicone grease between the second insulation layer 320 and the cold - shrinkable insulation joint 110, and the silicone grease between the first insulation layer 220 and the cold - shrinkable insulation joint 110 move along the first direction X towards the position corresponding to the mesh seal 120. It can be understood, but not limited to this, that in other embodiments, the mesh structure can also be disposed between the cold - shrinkable insulation joint 110 and the second insulation layer 320. When the cold - shrinkable insulation joint 110 shrinks, the internal support is gradually withdrawn from the end of the cold - shrinkable insulation joint 110 far from the second wire 300. Thus, the cold - shrinkable insulation joint 110 gradually shrinks from the end near the first wire 200 towards the end near the second wire 300. As a result, the silicone grease between the first insulation layer 220 and the cold - shrinkable insulation joint 110, and the silicone grease between the second insulation layer 320 and the cold - shrinkable insulation joint 110 move along the first direction X towards the position corresponding to the mesh seal 120.

[0032] Please refer to Figure 2 , Figure 4 and Figure 5 , in some embodiments, the cold - shrinkable insulation joint 110 has a communicating cavity 111 and an adhesive cavity 112 inside. The cavity 111 corresponds to the connection of the first wire 200 and the second wire 300, and the adhesive cavity 112 corresponds to the first insulation layer 220 or the second insulation layer 320. The mesh seal 120 is fixed to the inner wall of the adhesive cavity 112. The inner wall of the cavity 111 can completely wrap the first conductor 210 of the first wire 200 exposed outside and the second conductor 310 of the second wire 300 exposed outside, and wrap part of the first insulation layer 220 and part of the second insulation layer 320. The mesh seal 120 is adhered to the inner wall of the adhesive cavity 112 so that when the cold - shrinkable insulation joint 110 shrinks, it can drive the mesh seal 120 to move towards the first insulation layer 220 or the second insulation layer 320.

[0033] Exemplarily, the mesh seal 120 can be adhered to the inner wall of the adhesive cavity 112 by glue.

[0034] When the cold - shrinkable insulation joint 110 shrinks, the part of the cold - shrinkable insulation joint 110 at the cavity 111 shrinks first, and the part of the cold - shrinkable insulation joint 110 at the adhesive cavity 112 shrinks later.

[0035] In some embodiments, the mesh seal 120 is cylindrical in shape, and the shape of the bonding cavity 112 matches the shape of the mesh seal 120. The axis of the mesh seal 120 and the axis of the bonding cavity 112 are collinear. When the part of the cold-shrinkable insulating joint 110 at the bonding cavity 112 shrinks, the inner side of the mesh seal 120 can evenly abut against the first insulating layer 220 or the second insulating layer 320, so that the silicone grease can be evenly filled in the solute holes 123 in the circumferential direction of the mesh seal 120.

[0036] In some embodiments, the inner diameter of the bonding cavity 112 is smaller than the inner diameter of the cavity 111, so that the mesh seal 120 can abut against the first insulating layer 220 or the second insulating layer 320 faster, and the excess silicone grease can be accommodated in the solute holes 123, thus effectively preventing the silicone grease from overflowing.

[0037] Please refer to Figure 6 and Figure 7 , the mesh seal 120 is cylindrical in shape, and the axial direction of the mesh seal 120 is parallel to the first direction X. The width direction after the mesh seal 120 is cut and unfolded along the first direction X is defined as the second direction Y, and the second direction Y is parallel to a radial direction when the mesh seal 120 is cylindrical. The length direction after the mesh seal 120 is cut and unfolded along the first direction X is parallel to the first direction X.

[0038] The mesh seal 120 is formed by cross-connecting a plurality of mesh strips 121. The connection points between the mesh strips 121 are nodes 122, and the wall of the solute hole 123 is formed by enclosing a plurality of mesh strips 121.

[0039] In some embodiments, the solute holes 123 are diamond-shaped holes, and the wall of the solute hole 123 is formed by enclosing four mesh strips 121. Each solute hole 123 corresponds to four nodes 122 (except for the solute holes 123 at both ends of the mesh seal 120 along the first direction X). When the wire expands and contracts due to thermal expansion and contraction in an extreme environment, the diamond structure of the solute hole 123 can achieve structural deformation without excessive pulling of the mesh strips 121, thus ensuring the strength of the mesh seal 120. When air and water vapor invade along the first direction X, the air and water vapor will be gathered at the nodes 122, and the sealing performance at the nodes 122 is relatively high, thereby improving the sealing ability of the epoxy resin insulated tubular busbar cold-shrinkable insulating intermediate joint 100.

[0040] Exemplarily, when the wire expands and contracts due to thermal expansion and contraction in an extreme environment, the mesh seal 120 will expand or contract along the second direction Y to deform the diamond structure of the solute hole 123. It should be noted that the direction in which the mesh seal 120 expands or contracts is multiple directions, and the second direction Y is only one of them.

[0041] When the mesh seal 120 abuts against the first insulating layer 220 or the second insulating layer 320, the solute holes 123 at one end of the mesh seal 120 close to the connection of the first conductor 210 and the second conductor 310 along the first direction X are filled with silicone grease, causing the corresponding solute holes 123 to deform and increase. Correspondingly, the solute holes 123 at the other end deform and decrease. The decrease in the deformation of the solute holes 123 increases the pressure inside the solute holes 123, making it difficult for water vapor and air to enter, thereby improving the sealing ability of the end of the mesh seal 120 away from the connection of the first conductor 210 and the second conductor 310 along the first direction X.

[0042] Please refer to Figure 2 , in some embodiments, the epoxy resin insulated pipe-type busbar cold-shrinkable insulating intermediate joint 100 further includes a conductor joint 130. The conductor joint 130 is disposed in the cavity 111 and covers both the first conductor 210 and the second conductor 310 at the same time. The conductor joint 130 is used to connect the first conductor 210 and the second conductor 310, and the silicone grease between the cold-shrinkable insulating joint 110 and the first insulating layer 220 can flow through the conductor joint 130 to between the cold-shrinkable insulating joint 110 and the second insulating layer 320, or the silicone grease between the cold-shrinkable insulating joint 110 and the second insulating layer 320 can flow through the conductor joint 130 to between the cold-shrinkable insulating joint 110 and the first insulating layer 220.

[0043] Exemplarily, the conductor joint 130 is covered on the first conductor 210 and the second conductor 310 by crimping.

[0044] In some embodiments, please refer to Figure 2 and Figure 5 , the cold-shrinkable insulating joint 110 further includes a stress tube 113 and two stress cones 114. The two stress cones 114 are respectively disposed at both ends in the cavity 111. The stress tube 113 is disposed in the cavity 111 and is located between the two stress cones 114. The stress tube 113 corresponds to the conductor joint 130. The stress tube 113 is used to disperse and relieve the stress generated at the connection of the first conductor 210 and the second conductor 310, as well as the stress generated at the conductor joint 130. The stress cone 114 is conical, and the stress cone 114 can disperse the stress to other areas of the cold-shrinkable insulating joint 110, avoiding damage to the connection of the first conductor 210 and the second conductor 310 due to excessive stress.

[0045] Exemplarily, the stress tube 113 is integrally formed with the cold-shrinkable insulating joint 110, and the stress cone 114 is integrally formed with the cold-shrinkable insulating joint 110.

[0046] Please refer to Figure 2 and Figure 4, in some embodiments, the epoxy resin insulated tubular busbar cold-shrinkable insulation intermediate joint 100 further includes a joint metal shielding net 140, a joint waterproof tape 150, and a heat-shrinkable outer sheath 160. The joint metal shielding net 140 is wrapped outside the cold-shrinkable insulation joint 110. The joint waterproof tape 150 is wound around the outside of the joint metal shielding net 140. The heat-shrinkable outer sheath 160 is wrapped outside the joint waterproof tape 150. The joint metal shielding net 140 can reduce electromagnetic interference, ensure the stability and safety during the transmission of the first conductor 210 and the second conductor 310, and the joint metal shielding net 140 can also increase the mechanical strength and improve the resistance to external physical impacts. The joint waterproof tape 150 can fix the joint metal shielding net 140 on the first wire 200 and the second wire 300, and prevent moisture and air from entering. The heat-shrinkable outer sheath 160 can be fixed outside the joint waterproof tape 150 by heat shrinking to protect the joint metal shielding net 140, the joint waterproof tape 150, and the cold-shrinkable insulation joint 110.

[0047] Furthermore, the overall length of the joint waterproof tape 150 is longer than the length of the joint metal shielding net 140, and the length of the heat-shrinkable outer sheath 160 is longer than the overall length of the joint waterproof tape 150.

[0048] Please refer to Figure 2 and Figure 4 , in some embodiments, the epoxy resin insulated tubular busbar cold-shrinkable insulation intermediate joint 100 further includes two waterproof rubber strips 180. The two waterproof rubber strips 180 are respectively wound around the first insulating layer 220 and the second insulating layer 320. One waterproof rubber strip 180 is located between the first insulating layer 220 and the heat-shrinkable outer sheath 160, and the other waterproof rubber strip 180 is located between the second insulating layer 320 and the heat-shrinkable outer sheath 160. The waterproof rubber strip 180 is used to prevent air and moisture from invading into the heat-shrinkable outer sheath 160 along the first direction X.

[0049] In some embodiments, the waterproof rubber strip 180 is the first sealing structure; the mesh strips 121 and the nodes 122 of the solute holes 123 at one end of the mesh seal 120 away from the connection of the first conductor 210 and the second conductor 310 along the first direction X are the second sealing structure; the mesh strips 121, the nodes 122 of the solute holes 123, and the silicone grease in the solute holes 123 at one end of the mesh seal 120 close to the connection of the first conductor 210 and the second conductor 310 along the first direction X are the third sealing structure.

[0050] To ensure the rigidity and insulation of the connection between the first conductor 210 and the second conductor 310, a relatively thick insulation connection structure is usually provided, so that when the first conductor 210 and the second conductor 310 generate heat, the heat transfer efficiency is relatively low, and heat concentration in the middle part is likely to occur.

[0051] Please refer toFigure 4 and Figure 8 In some embodiments, the epoxy resin insulated pipe type busbar cold shrinkable insulating intermediate joint 100 further includes a heat dissipation member 170. The heat dissipation member 170 is sleeved on one end of the heat shrinkable outer sheath 160 and corresponds to the mesh seal 120. The heat on the first conductor 210 is conducted to the silicone grease in the solute holes 123 of the mesh seal 120 through the silicone grease film between the first insulating layer 220 and the cold shrinkable insulating joint 110, and then dissipated through the heat dissipation member 170, so as to improve the heat conduction ability in the axial direction of the first conductor 210 and prevent heat accumulation. Or the heat on the second conductor 310 is conducted to the silicone grease in the solute holes 123 of the mesh seal 120 through the silicone grease film between the second insulating layer 320 and the cold shrinkable insulating joint 110, and then dissipated through the heat dissipation member 170, so as to improve the heat conduction ability in the axial direction of the second conductor 310 and prevent heat accumulation.

[0052] In some embodiments, the heat of the silicone grease in the solute holes 123 of the mesh seal 120 needs to be conducted to the heat dissipation member 170 through the joint metal shielding net 140, the joint waterproof tape 150 and the heat shrinkable outer sheath 160 in sequence.

[0053] In some embodiments, the heat dissipation member 170 includes a body 171 and a plurality of heat dissipation fins 172. The body 171 is sleeved on one end of the heat shrinkable outer sheath 160, and the plurality of heat dissipation fins 172 are arranged at intervals in the circumferential direction outside the body 171. The plurality of heat dissipation fins 172 arranged at circumferential intervals can effectively improve the heat dissipation ability of the heat dissipation member 170.

[0054] In some embodiments, the main component of the cold shrinkable insulating joint 110 is silicone rubber, and the silicone grease contains heat conductive fillers (such as alumina and boron nitride).

[0055] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0056] The above-described embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A cold-shrinkable insulating intermediate joint for an epoxy resin insulated tubular busbar, characterized in that, For connecting a first wire and a second wire, the first wire includes a first conductor and a first insulating layer coated on the first conductor, the second wire includes a second conductor and a second insulating layer coated on the second conductor, the first conductor and the second conductor are connected, silicone grease is applied on both the first insulating layer and the second insulating layer, and the epoxy resin insulated tubular busbar cold shrinkable insulating intermediate joint includes: A cold shrinkable insulating joint sleeved on the connection of the first wire and the second wire; A mesh seal fixed in the cold shrinkable insulating joint and located between the cold shrinkable insulating joint and the first insulating layer, or between the cold shrinkable insulating joint and the second insulating layer, and a plurality of solute holes are formed in the mesh seal; Wherein, when the cold shrinkable insulating joint shrinks, it can squeeze the silicone grease on the first insulating layer and the second insulating layer to move towards the mesh seal, and when the mesh seal moves towards the first insulating layer or the second insulating layer, the solute holes can accommodate the silicone grease.

2. The cold-shrinkable insulating intermediate joint of the epoxy resin insulated tubular busbar according to claim 1, characterized in that, The inside of the cold shrinkable insulating joint has a communicating cavity and an adhesive cavity. The cavity corresponds to the connection of the first wire and the second wire, the adhesive cavity corresponds to the first insulating layer or the second insulating layer, and the mesh seal is fixed on the inner wall of the adhesive cavity.

3. The cold-shrinkable insulating intermediate joint for epoxy resin insulated tubular busbars according to claim 2, wherein The shape of the mesh seal is cylindrical, the shape of the adhesive cavity matches the shape of the mesh seal, and the axis of the mesh seal and the axis of the adhesive cavity are collinear.

4. The cold-shrinkable insulating intermediate joint for epoxy resin insulated tubular busbars according to claim 2, characterized in that, The inner diameter of the adhesive cavity is smaller than the inner diameter of the cavity.

5. The cold-shrink type insulating intermediate joint of epoxy resin insulated tubular bus according to claim 2, characterized in that, The cold shrinkable insulating joint further includes a stress tube and two stress cones. The two stress cones are respectively arranged at both ends in the cavity, the stress tube is arranged in the cavity and located between the two stress cones, and the stress tube corresponds to the connection of the first conductor and the second conductor.

6. The cold-shrink type insulating intermediate joint of the epoxy resin insulated tubular busbar according to claim 5, characterized in that, The epoxy resin insulated tubular busbar cold shrinkable insulating intermediate joint further includes a conductor joint. The conductor joint is arranged in the cavity and covers both the first conductor and the second conductor at the same time, and the outside of the conductor joint corresponds to the stress tube.

7. The cold-shrinkable insulating intermediate joint for epoxy resin insulated tubular busbars according to any one of claims 1-5, characterized in that, The epoxy resin insulated tubular busbar cold shrinkable insulating intermediate joint further includes a heat dissipation member. The heat dissipation member is sleeved outside the first insulating layer or the second insulating layer and corresponds to the mesh seal.

8. The cold-shrink type insulating intermediate joint for epoxy resin insulated tubular bus according to claim 7, characterized in that, The heat dissipation member includes a body and a plurality of heat dissipation fins. The body is sleeved outside the first insulating layer or the second insulating layer, and the plurality of heat dissipation fins are arranged at intervals along the circumferential direction outside the body.

9. The cold-shrink type insulating intermediate joint for epoxy resin insulated tubular busbars according to claim 8, wherein, The epoxy resin insulated tubular busbar cold shrinkable insulating intermediate joint further includes a joint metal shielding net, a joint waterproof tape and a heat shrinkable outer sheath. The joint metal shielding net is coated outside the cold shrinkable insulating joint, the joint waterproof tape is wound outside the joint metal shielding net, the heat shrinkable outer sheath is coated outside the joint waterproof tape, and the body is sleeved at one end of the heat shrinkable outer sheath.

10. The cold-shrinkable insulating intermediate joint for epoxy resin insulated tubular busbars according to any one of claims 1-5, characterized in that, The solute holes are diamond-shaped holes.

Images