Anti-freezing cable accessory for cold areas

Abstract

The invention relates to the technical field of cable accessories, and discloses an anti-freezing cable accessory in a cold and frozen area, which comprises an accessory shell, one side of the accessory shell is connected with a flange plate, the outer surface of the accessory shell is wrapped with a hoop, a cable body is embedded in the accessory shell, a fixing bolt is embedded in the flange plate, and the fixing bolt is connected with the flange plate. The two accessory shells are connected through fixing bolts. According to the anti-freezing cable accessory in the cold and frozen area, by means of a regular notch pre-cut by the slitting assembly, when the cable is cooled and expands, stress is released through expansion of the insulating skin, and the problems of irregular cable cracking, expansion and poor connection end contact caused by freezing are solved; the positioning cylinder can be synchronously driven to rotate in cooperation with single operation of the rotating ring, the slitting knife cuts the insulation skin and the connecting piece drives the insulation skin to expand, no extra tool is needed for slitting and expanding, assembling steps are reduced, the connection stability can be improved after expanding, the service life of accessories is prolonged, and the long-term connection stability is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable accessories, in particular to a freezing region anti-freezing cable accessory. BACKGROUND

[0002] As an indispensable key supporting component of the cable system, the cable accessory is the core guarantee for realizing the stable transmission of electric energy or signals. Its core function is to efficiently connect the cable and external equipment to ensure the lossless transmission of electric energy or signals. In actual application, the cable must complete the terminal processing through the accessory, such as connecting to the power distribution cabinet, switch equipment or terminal user interface, and intermediate connection, including cable joints, branch boxes or transition joints and other key links. In cold regions, the low-temperature environment will cause the outer insulation skin and the thin protective skin of the electric core to shrink due to thermal expansion and cold contraction effect, resulting in significant internal stress. If the cable accessory is not properly designed or the material performance is insufficient, it cannot effectively buffer or release this stress, which easily leads to the cracking of the protective skin, the failure of the seal, and further causes the decline of insulation performance, moisture intrusion or short circuit risk. These problems not only interrupt the transmission of electric energy, but also accelerate the aging of the cable, increase the maintenance cost, and thus seriously threaten the overall safety and long-term service life of the cable system.

[0003] However, in cold environments, the protective skin can only passively withstand the cold contraction force due to material properties, and cannot actively adapt to temperature changes, which is prone to irregular cracking. Once cracked, moisture and various impurities will invade from the gap, accelerating the aging process of the insulation material, and causing the surface of the conductor to rust. These irregular cracks will form an electric field distortion, which is more likely to cause partial discharge in medium and high voltage application scenarios, thus seriously threatening the safe operation and overall stability of electrical equipment. SUMMARY

[0004] The technical problem to be solved by the present application is that low temperature can cause the protective skin of the cable to crack in the prior art. To solve this problem, the present application provides a freezing region anti-freezing cable accessory.

[0005] To achieve the above purpose, the following technical scheme is adopted in the present application: a freezing region anti-freezing cable accessory, comprising an accessory shell, a flange plate connected to one side of the accessory shell, a clamp wrapped around the outer surface of the accessory shell, a cable body embedded in the interior of the accessory shell, a fixing bolt embedded in the interior of the flange plate, two accessory shells connected by the fixing bolt, and the end faces of the two cable bodies connected together after connection. An inserting assembly is embedded in the interior of the accessory shell, the inserting assembly comprises a positioning cylinder, a swivel joint connected to one end of the positioning cylinder, a reserved groove opened on the surface of the positioning cylinder, a jamb embedded in the interior of the reserved groove, and a split groove opened on the outer surface of the swivel joint. The inner wall of the accessory shell is fixedly connected with a slitting assembly, the slitting assembly comprises a connecting piece, one side of the connecting piece is connected with a slitting cutter, and the slitting cutter is embedded into the inside of a slitting groove.

[0006] Preferably, the positioning cylinder is rotatably embedded into the inside of the accessory shell, and a rotating ring at one end of the positioning cylinder extends to the outside of the accessory shell.

[0007] Preferably, the accessory shell is embedded into the inside of the positioning cylinder, the positioning cylinder forms a wrapping positioning on the accessory shell, and the inner wall of the positioning cylinder is divided into two regions along the axial direction, one region is a horn-shaped structure, and the internal space of the region gradually expands along the embedding direction of the accessory shell; the other region has a constant profile of the inner wall without space size change.

[0008] Preferably, the inner wall of the accessory shell is uniformly provided with six groups of connecting pieces, and one connecting piece is correspondingly arranged on each group of connecting pieces.

[0009] Preferably, the connecting piece and the slitting cutter are fixedly connected, the slitting cutter is perpendicular to the surface of the cable body, and the slitting cutter is used for cutting the insulating skin on the surface of the cable body.

[0010] Preferably, the thickness of the slitting cutter is different, and the thickness of the side close to the embedded side of the cable body in the accessory shell is smaller than that of the opposite side.

[0011] Preferably, the top column is embedded into the inside of a reserved groove, and the reserved groove is uniformly distributed on the outer side of the positioning cylinder and is in close contact with the inner wall of the accessory shell.

[0012] Preferably, the slitting cutter is composed of silica gel and a metal elastic sheet, and the metal elastic sheet is embedded in the silica gel.

[0013] Preferably, the rotating ring drives the positioning cylinder to rotate, and the connecting piece is deflected under the driving of the slitting cutter, so that the slitting cutter is bent.

[0014] Preferably, the bending of the slitting cutter drives the upward deflection of the connecting piece, and the upward deflection of the connecting piece is used for lifting the insulating skin.

[0015] Technical effects and advantages of the present application: In the present application, the gap between the cable core and the insulation skin formed after expansion, combined with the low thermal conductivity of the insulation skin and air, builds a double low thermal conduction path, greatly reduces the transmission efficiency of heat outside the accessory shell to the cable joint, effectively alleviates the freezing risk of the accessory wrapped area at low temperature, adapts to the use demand in cold winter areas, in addition, with the help of the regular incision pre-cut by the slitting assembly, when the cable expands due to cold, the stress is released by the expansion of the insulation skin, avoiding the problem of irregular cracking, expansion and poor contact of the connecting end caused by freezing, ensuring long-term connection stability; In terms of operation convenience, the positioning cylinder rotation, slitting knife cutting insulation skin and insulation skin expansion driven by the adapter piece can be simultaneously driven by single operation of the rotating ring, so that slitting and expansion do not require additional tools, reducing assembly steps, and the stability of the connection is also increased after expansion, prolonging the service life of the accessory. BRIEF DESCRIPTION OF DRAWINGS

[0016] The disclosure of the present application will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings, the same reference signs are used to refer to the same parts: Figure 1 is a schematic view of the three-dimensional structure of the present application; Figure 2 is a schematic view of the structure of the accessory shell and the cable body of the present application; Figure 3 is a schematic view of the cross-sectional structure of the accessory shell of the present application; Figure 4 is a schematic view of the structure of the positioning cylinder and the adapter piece of the present application; Figure 5 is a schematic view of the structure of the flange and the adapter piece of the present application; Figure 6 is a schematic view of the structure of the cable body and the slitting knife of the present application; Figure 7 is a schematic view of the structure of the adapter piece and the slitting knife of the present application; Figure 8 is a schematic view of the explosion structure of the present application.

[0017] Legend: 11, accessory shell; 12, flange; 13, clamp; 14, cable body; 15, fixing bolt; 2, insertion assembly; 21, positioning cylinder; 22, rotating ring; 23, reserved slot; 24, slitting slot; 25, jacking column; 3, slitting assembly; 31, adapter piece; 32, slitting knife. DETAILED DESCRIPTION

[0018] It is easy to understand that according to the technical scheme of the present application, those skilled in the art can propose a plurality of structure modes and implementation modes which can be replaced with each other without changing the essential spirit of the present application. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical scheme of the present application, and should not be regarded as the whole or as the limitation or restriction of the technical scheme of the present application.

[0019] Reference Figures 1-8As shown, the present application provides a technical solution: a kind of anti-freezing cable accessory in cold region, including accessory shell 11, one side of accessory shell 11 is connected with flange 12, the outer surface of accessory shell 11 is wrapped with clamp 13, cable body 14 is embedded in the inside of accessory shell 11, fixed bolt 15 is embedded in the inside of flange 12, the rigid connection of two accessory shell 11 is realized by fixed bolt 15, ensure the structural stability of butt joint, the end surface of two cable body 14 is accurately butt joint after connection, provide continuous path for current transmission, provide basic support for subsequent anti-freezing design.

[0020] The inside of accessory shell 11 is embedded with plug-in assembly 2, which is mainly composed of positioning cylinder 21, one end of positioning cylinder 21 is fixedly connected with swivel 22, the entire positioning cylinder 21 is embedded and installed in the internal cavity of accessory shell 11 by rotating mode, and the swivel 22 at its end extends outward and is exposed to the outer surface of accessory shell 11.

[0021] In the assembled state, cable body 14 is embedded in the internal passage of positioning cylinder 21 and is circumferentially wrapped and axially positioned by positioning cylinder 21. It is worth noting that the inner wall of positioning cylinder 21 is clearly divided into two functional areas along its axial direction. The area close to the cable embedding entrance end is designed as a flared structure, and the internal space thereof gradually expands along the embedding direction of cable body 14, and the other area maintains a constant inner wall profile, and the space size thereof does not change along the axial direction, to provide stable and continuous support and constraint for cable body 14.

[0022] In addition, a plurality of reserved slots 23 are uniformly provided on the outer cylindrical surface of positioning cylinder 21, and one top pillar 25 is accurately embedded in each reserved slot 23, and the top pillar 25 is completely accommodated in the structural space of the reserved slot 23. The outer surfaces of these uniformly distributed reserved slots 23 and the top pillars 25 therein are tightly fitted with the inner wall of accessory shell 11, and jointly play the role of auxiliary positioning or providing friction resistance. The outer circumferential surface of swivel 22 is also processed with a split groove 24.

[0023] The internal space of this area gradually expands along the embedding direction of cable body 14 to provide an adaptive space for subsequent insulation skin expansion, and the other area has a flat inner wall with a constant profile to ensure the initial positioning accuracy of cable body 14 when embedded.

[0024] The inner wall of the accessory shell 11 is fixedly connected with a slitting assembly 3, the slitting assembly 3 comprises a link piece 31, the inner wall of the accessory shell 11 is uniformly provided with six groups of link pieces 31, one slitting cutter 32 is correspondingly arranged on each group of link pieces 31, one side of the link piece 31 is connected with the slitting cutter 32, the slitting cutter 32 is embedded into the inside of the slitting groove 24, the link piece 31 and the slitting cutter 32 are fixedly connected, the slitting cutter 32 is perpendicular to the surface of the cable body 14, the slitting cutter 32 is used for cutting the insulating skin on the surface of the cable body 14, the thickness of the slitting cutter 32 is different, wherein the thickness of the side close to the cable body 14 embedded in the accessory shell 11 is less than that of the opposite side.

[0025] The slitting cutter 32 is designed by using composite materials to adapt to the cold winter environment, which is composed of a silica gel outer layer and a metal elastic sheet inner core. The metal elastic sheet is embedded in the silica gel, which not only provides stable elastic recovery force to ensure the reliability of the slitting and bending actions, but also avoids the brittle cracking of the slitting cutter 32 at low temperature by taking advantage of the low-temperature resistance of silica gel. When the staff rotates the rotating ring 22, the rotating ring 22 drives the positioning cylinder 21 to rotate synchronously. At this time, the inner wall of the slitting groove 24 will contact the slitting cutter 32 and generate a stirring force. Under the driving of the force, the link piece 31 is elastically deflected, and in turn drives the slitting cutter 32 to bend away from the cable body 14. The bending of the slitting cutter 32 further pulls the free end of the link piece 31 to rise upwards. This upward action directly acts on the edge of the cut insulating skin, and the insulating skin is pried outward by mechanical force, providing power for the expansion and fitting of the insulating skin to the inner wall of the positioning cylinder 21, realizing the synchronous cutting and expansion.

[0026] Working principle: In the cable laying project in the cold winter area, the cable accessory is the key component to ensure the reliable connection between the cables. Its role is to professionally process the connecting end of the cable, accurately embed the cable end into the internal structure of the accessory after pretreatment, so as to realize stable mechanical fixation and precise electrical butt joint. However, due to the extremely low temperature in the cold winter area, which can often reach several tens of degrees below zero, the conventional cable accessory materials are easy to be brittle, shrink or fail due to low temperature, resulting in performance decline or even failure of the connection. Therefore, it is necessary to use specially designed anti-freezing cable accessories to ensure the long-term stability and safety of the cable connection.

[0027] During the connection operation of the cable, first, the end of the cable body 14 needs to be subjected to a preliminary processing step. Specifically, the hard insulation layer wrapped around the outermost layer of the cable body 14 needs to be peeled off to expose the internal structure. After the peeling is completed, the cable body 14 is gradually inserted into the internal cavity of the accessory shell 11 from a designated side. During this insertion process, the cable body 14 passes through and goes through the hollow internal passage of the positioning cylinder 21. As the cable body 14 continuously advances into the accessory shell 11, its outer surface eventually comes into contact with the slitting knife 32 fixedly installed on the inner wall of the accessory shell 11, which can accurately cut the surface of the cable body 14 to form a specific opening structure.

[0028] After the cable body 14 is completely inserted into the deepest part of the accessory shell 11 and reaches the predetermined position, a tightening operation needs to be performed: rotating the special bolt arranged on the cable body 14 to gradually shrink and tighten the ring opening. After confirming that the ring opening has been effectively shrunk in place, the positioning cylinder 21 is then operated to apply uniform radial pressing force from a specific side, which promotes the positioning cylinder 21 to tightly engage with the shrunk cable body 14 ring, thereby firmly connecting the two as a whole. The core purpose of this connection method is to ensure that the cable body 14 segment inserted into the internal passage of the positioning cylinder 21 is reliably locked and cannot be accidentally loosened or slipped out due to stress or vibration during subsequent use.

[0029] Then the worker rotates the swivel 22, which drives the positioning cylinder 21 connected thereto to rotate. By rotating the positioning cylinder 21 inside the accessory shell 11, the slitting groove 24 on the positioning cylinder 21 also moves. During the rotation of the positioning cylinder 21, the slitting knife 32 embedded in the slitting groove 24 will be in contact with the groove wall and be pressed, thereby resisting the slitting knife 32 and causing the connected link piece 31 below to bend and deform. When the link piece 31 is bent, the slitting knife 32 correspondingly presents an upward tilting state. This upward tilting action of the slitting knife 32 effectively expands the cut insulation skin outward, causing the insulation skin to expand. The expanded insulation skin is then supported and expanded on the inner wall of the positioning cylinder 21, and the area of the inner wall of the positioning cylinder 21 with a flared structure is filled with the expanded insulation skin. The support structure formed after filling can effectively prevent the cable body 14 from accidentally falling out of the interior of the positioning cylinder 21.

[0030] In cold winter areas, due to the limitation of the material of the cable accessory itself, its heat preservation performance is poor, and the outer skin of the cable body 14 embedded in the accessory is completely stripped to meet the installation requirements, which makes the area tightly wrapped by the accessory more prone to freezing in low temperature environment. After freezing, the connection of the cable body 14 will be irregularly cracked due to the expansion of ice crystals, and then irregular expansion and deformation of the cable material will be caused, finally leading to the problem of poor contact of the connection end of the cable body 14, seriously affecting the stability and safety of power transmission.

[0031] To solve the above problems, the staff manually rotates the rotating ring 22, and uses the rotating motion of the rotating ring 22 to drive the positioning cylinder 21 to rotate synchronously inside the accessory shell 11. This rotating process triggers the linkage mechanism of the positioning cylinder 21 and the adapter piece 31, so that the split cutter 32 embedded in the split slot 24 is displaced under the contact resistance, thereby driving the adapter piece 31 to bend and deform. During the bending process, the insulation skin is raised upward and expanded outward, forming a uniform expansion state.

[0032] The expanded insulation skin can tightly fit and tighten the flared inner wall of the positioning cylinder 21, achieving stable mechanical locking and effectively preventing the cable body 14 from accidentally falling out of the positioning cylinder 21. At the same time, this design ingeniously integrates the cutting operation and expansion process of the insulation skin into the same continuous operation process, avoiding the complexity of multiple steps in traditional methods, greatly improving the assembly efficiency and the reliability of the overall system.

[0033] More importantly, by pre-cutting regular notches in the insulation skin, the design allows the insulation skin to release stress by expanding outward when the cable body 14 expands due to cold, preventing connection loosening caused by expansion, thereby further ensuring the stability of the connection end of the cable body 14.

[0034] In addition, the expanded insulation skin can also optimize the heat transfer path. The expanded insulation skin tightly fits the inner wall of the positioning cylinder 21, and at the same time forms a gap between the cable core and the insulation skin of the cable body 14, and there is no solid medium filling in the gap, directly blocking the solid medium heat conduction path between them. In the heat transfer link, the heat on the outside of the accessory shell 11 needs to be transferred to the positioning cylinder 21 first, and then conducted to the joint of the cable body 14 through two paths, one is through the insulation skin to the cable core, and the other is through the gap between the positioning cylinder 21 and the cable core. Since the insulation skin of the cable body 14 itself is a low thermal conductivity material, the heat transfer efficiency of the first path is significantly reduced, and the air heat conductivity is also poor, so the transfer effect of the second path is also limited. The superposition of the two low thermal conductivity paths greatly improves the difficulty of heat transfer from the outside of the accessory shell 11 to the joint of the cable body 14, and finally makes the structure better adapt to the low temperature use requirements in cold winter areas.

[0035] The technical scope of the present application is not limited to the above description, and those skilled in the art can make various modifications and changes to the above embodiments without departing from the technical idea of the present application, and these modifications and changes should all belong to the protection scope of the present application.

Claims

1. A cold region freeze resistant cable accessory characterized by, The utility model provides accessory shell, one side of the accessory shell is connected with flange, the outer surface of the accessory shell is wrapped with the clamp, the inside of the accessory shell is embedded with cable body, the inside of the flange is embedded with fixed bolt, two the accessory shell is connected through fixed bolt, and the end surface of two cable bodies is connected together after connection, the inside of the accessory shell is embedded with the insert component, the insert component includes the locating cylinder, one end of the locating cylinder is connected with the swivel joint, the surface of the locating cylinder is provided with the reserved groove, the inside of the reserved groove is embedded with the jamb, the outer surface of the swivel joint is also provided with the split groove, the inner wall of the accessory shell is fixedly connected with the split component, the split component includes the link piece, one side of the link piece is connected with the split cutter, and the split cutter is embedded into the inside of the split groove.

2. The cold region freeze resistant cable accessory of claim 1, wherein: The locating cylinder rotates and is embedded into the inside of the accessory shell, and the swivel joint at one end of the locating cylinder extends to the outside of the accessory shell.

3. The cold region freeze resistant cable accessory of claim 1, wherein: The accessory shell is embedded into the inside of the locating cylinder, the locating cylinder forms a wrapping position for the accessory shell, the inner wall of the locating cylinder is divided into two regions along the axial direction, one region is a horn mouth structure, and the internal space of the region gradually expands in the embedding direction of the accessory shell; the other region has a constant profile of the inner wall without space size change.

4. The cold region freeze resistant cable accessory of claim 1, wherein: The inner wall of the accessory shell is uniformly provided with six groups of link pieces, and one link piece is arranged on each group of link pieces.

5. The cold region freeze resistant cable accessory of claim 4, wherein: The link piece and the split cutter are fixedly connected, the split cutter is perpendicular to the surface of the cable body, and the split cutter is used for cutting the insulating skin on the surface of the cable body.

6. The cold region freeze resistant cable accessory of claim 5, wherein: The thickness of the split cutter is different, and the thickness of the side close to the embedding side of the cable body in the accessory shell is smaller than the other side.

7. The cold region freeze resistant cable accessory of claim 1, wherein: The jamb is embedded into the inside of the reserved groove, and the reserved grooves are uniformly distributed on the outer side of the locating cylinder and are in close contact with the inner wall of the accessory shell.

8. The cold region freeze resistant cable accessory of claim 1, wherein: The split cutter is composed of silica gel and a metal elastic sheet, and the metal elastic sheet is embedded in the silica gel.

9. The cold region freeze resistant cable accessory of claim 8, wherein: The swivel joint rotates to drive the locating cylinder to rotate, and the link piece is deflected under the actuation of the split cutter, so that the split cutter is bent.

10. The cold region freeze resistant cable accessory of claim 9, wherein: The bending of the split cutter drives the link piece to be raised, and the raised link piece is used for lifting the insulating skin.

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