Cold contraction type outdoor cable sleeve

Abstract

The invention relates to a cold contraction type outdoor cable sleeve applied to the related technical field of cable accessories, through the arrangement of a shrinkage measuring array group, the shrinkage condition of the cable sleeve can be indicated to a certain extent, the situation that shrinkage cannot be expected can be conveniently found in time, compared with the prior art, the situation that an elastic sleeve with abnormal shrinkage is used is greatly reduced, and the service life of the cable sleeve is prolonged. Stable transmission of electric power is effectively ensured, and potential safety hazards are reduced. Besides, when the indication color bar is completely shielded, in cooperation with the arrangement of the detection channel, when the contraction condition is displayed, new color bands can be generated on the multiple opaque short bars, the higher the contraction force of the elastic sleeve is, the larger the collision force between the multiple opaque short bars is, the wider the color bands are, the more obvious the color bands are, and the display effect is better. And on the basis, a worker can be effectively assisted to effectively understand the condition of the sleeve, and the worker can conveniently judge the rough effective working period of the sleeve, so that different maintenance time can be conveniently set according to different conditions, and potential safety hazards are further reduced.

Description

Technical Field

[0001] A cable sleeve involved in the present invention, in particular, a cold-shrinkable outdoor cable sleeve applied to the technical field related to cable accessories. Background Art

[0002] Cold-shrinkable cable accessories are formed by injection vulcanization of elastomer materials in a factory, and then expanded and lined with plastic spiral supports. During on-site installation, these pre-expanded sleeves are put on the processed cable ends or joints, and then the internal supporting plastic spiral strips (support tubes) are pulled out, and the elastomer material on the surface is pressed against the cable insulation. Because cold-shrinkable cable accessories rely on elastic retraction force at room temperature, rather than being heated and shrunk by fire like heat-shrinkable cable accessories, they are commonly called cold-shrinkable cable accessories. For example, a radiation cross-linked heat-shrinkable cable accessory disclosed in the Chinese patent specification with the publication number CN106911115A.

[0003] Generally, the cold-shrinkable tube is in a pre-expanded state after production, and its interior is supported by a sleeve formed by a spiral support strip. However, there is a certain time interval between production, sales, and installation and use. When the time is too long, the internal spiral support strip may scatter or deform, and the outer elastic material may be over-fatigued, resulting in insufficient shrinkage and failing to meet the sealing requirements for cable connection. The Chinese patent specification with the publication number N106848987B discloses a cold-shrinkable indoor terminal. By only setting a protective sleeve, when the insulating tube shrinks, it shrinks slowly, can better adhere to the cable, seal the cable, reduce the cracking situation, and improve the service life of the terminal.

[0004] However, the above patent only improves the binding effect on the cable by slowing down the shrinkage speed. However, when the amplitude of local insufficient shrinkage is relatively large, it can be clearly observed with the naked eye and replaced. When the amplitude of insufficient shrinkage is relatively small, it is difficult to detect, which easily leads to its use under the condition of not meeting the sealing requirements, affecting the stable transmission of the cable and posing a certain safety hazard. Summary of the Invention

[0005] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is that long-term pre-expansion easily causes excessive fatigue of the elastic sleeve, resulting in insufficient shrinkage binding force on the cable during cable connection, poor sealing effect, and a certain safety hazard.

[0006] To solve the above problems, the present invention provides a cold-shrinkable outdoor cable sleeve, which includes an elastic sleeve and a liner spirally wound inside the elastic sleeve. The elastic sleeve includes a straight section and an outwardly expanding section fixedly connected to the straight section. The liner includes an inner spiral tube and a pulling strip fixedly connected to the end of the inner spiral tube. The end of the pulling strip movably penetrates through the elastic sleeve and extends to the outside of the other end of the elastic sleeve. A stress cone is fixedly embedded inside the outwardly expanding section. A plurality of evenly distributed shrinkage monitoring rings are fixedly sleeved on the outer ends of the straight section and the outwardly expanding section. The shrinkage monitoring ring includes an outer transparent cover ring fixedly connected to the outer end of the straight section or the outwardly expanding section, and multiple groups of shortening measurement matrix groups fixedly connected to the outer end of the straight section. The multiple shortening measurement matrix groups are arranged in a circular array around the axis of the elastic sleeve, and all the multiple shortening measurement matrix groups are located inside the outer transparent cover ring.

[0007] In the above cold-shrinkable outdoor cable sleeve, through the setting of the shortening measurement matrix group, when the elastic sleeve shrinks and binds the cable, it can give a certain indication of its shrinkage situation, which is convenient for timely detecting the situation where the shrinkage fails to meet the expectation, enabling the staff to replace the abnormal elastic sleeve in time. Compared with the prior art, the occurrence of using abnormal shrinkage elastic sleeves is greatly reduced, thereby effectively ensuring the stable transmission of electricity and reducing potential safety hazards.

[0008] As a further improvement of the present application, the shortening measurement matrix group includes a plurality of shading strips and an indicating color strip coated on the outer surface of the straight section. The plurality of shading strips are all fixedly connected to the straight section, and adjacent two shading strips are in contact with each other. The plurality of mutually contacting shading strips completely cover the indicating color strip. The axis of the shading strip is parallel to the axis of the straight section, and the indicating color strip is a high-brightness color.

[0009] As a further improvement of the present application, the shading strip includes a central positioning layer and two outer adaptation layers respectively fixedly connected to both ends of the central positioning layer. The outer surfaces of the outer adaptation layer and the central positioning layer are both arc-shaped and have the same curvature. The space enclosed by the outer adaptation layer and the central positioning layer is saturated with liquid.

[0010] As a further improvement of the present application, the outer adaptation layer is an elastic structure, the central positioning layer is a rigid structure, and both are opaque. The end of the central positioning layer facing the straight section is processed by cutting, and the cut surface is fixedly attached to the surface of the straight section or the outwardly expanding section.

[0011] As another improvement of the present application, the central positioning layer includes a color-permeable layer and a follower core fixedly embedded in the center of the color-permeable layer. A detection channel is provided between the follower core and the color-permeable layer. The left and right ends of the detection channel are respectively communicated with the spaces enclosed by the two outer adaptation layers and the central positioning layer.

[0012] As a further improvement supplement of the present application, the detection channel includes two horizontal liquid guide holes drilled at the left and right ends of the follower core, a liquid gathering cavity drilled at the center of the follower core, a liquid separating slit drilled at the upper end of the follower core, a vertical liquid guide hole drilled in the color-permeable layer, and an expanding liquid slit. The horizontal liquid guide holes, the liquid gathering cavity, the liquid separating slit, the vertical liquid guide hole, and the expanding liquid slit are communicated in sequence. The liquid gathering cavity and the horizontal liquid guide holes are also saturated with a liquid, and the liquid is a colored liquid, and the colored liquid is also a high-brightness color and is different from the color of the indicating color bar.

[0013] As a further improvement supplement of the present application, the follower core is a non-transparent elastic structure, and the left and right inner walls of the liquid separating slit are in contact with each other, and the color-permeable layer is a transparent structure.

[0014] As a further improvement supplement of the present application, the vertical liquid guide hole and the expanding liquid slit form a T shape, and the side view cross-section of the expanding liquid slit is an arc-shaped concave downward, and the top view cross-section of the expanding liquid slit is a long rectangle.

[0015] In summary, through the setting of the measurement shortening matrix group, when the elastic sleeve shrinks and binds the cable, it can give a certain indication of its shrinking situation, which is convenient for promptly detecting the situation where the shrinkage fails to meet the expectation, enabling the staff to replace the abnormal elastic sleeve in time. Compared with the prior art, the situation where the abnormally shrinking elastic sleeve is used is greatly reduced, thereby effectively ensuring the stable transmission of electricity and reducing potential safety hazards. In addition, when the indicating color bar is completely blocked, in combination with the setting of the detection channel, when showing the shrinking situation, new color bands will also be generated on multiple shading short strips. Moreover, the stronger the shrinking force of the elastic sleeve, the greater the contact force between multiple shading short strips, and the wider and more obvious the color bands are. Based on this, it can also effectively assist the staff in effectively understanding the situation of the sleeve, facilitating the staff to judge its approximate effective service life, so as to set different maintenance times according to different situations, and further reduce potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front cross-sectional view of the first embodiment of the present application;

[0017] Figure 2 It is the front view of the first embodiment of the present application;

[0018] Figure 3 It is the radial cross-sectional view of the first embodiment of the present application before pre-expansion;

[0019] Figure 4 It is the radial cross-sectional view of the first embodiment of the present application during pre-expansion;

[0020] Figure 5 It is the cross-sectional view of the shading short strip of the first embodiment of the present application;

[0021] Figure 6 Cross-sectional view of the measurement shortening matrix group of the first embodiment of the present application in the radial cross-section part of the elastic sleeve from pre-expansion to connection outside the cable;

[0022] Figure 7 Partial cross-sectional view of the elastic sleeve after shrinkage when local fatigue occurs in the first embodiment of the present application;

[0023] Figure 8 Top-down comparison view of the shrinkage monitoring ring of the first embodiment of the present application in the elastic sleeve from pre-expansion to connection outside the cable;

[0024] Figure 9 Cross-sectional view of the shading strip of the second embodiment of the present application;

[0025] Figure 10 Schematic diagram of the change in the cross-section of the shading strip when the force is well applied in the second embodiment of the present application;

[0026] Figure 11 Color band display of the elastic sleeve in different situations in the second embodiment of the present application.

[0027] Explanation of the reference numerals in the figure:

[0028] 11 Straight section, 12 Outer expansion section, 2 Stress cone, 31 Inner spiral tube, 32 Pulling tube strip, 4 Shrinkage monitoring ring, 41 Outer transparent cover ring, 42 Shading strip, 421 Central positioning layer, 422 Outer adaptation layer, 43 Indicator color strip, 51 Transparent layer, 52 Follow-up core, 501 Horizontal liquid guiding hole, 502 Liquid gathering cavity, 503 Liquid separating seam, 504 Vertical liquid guiding hole, 505 Liquid expanding slit. Specific embodiments

[0029] The following describes the two embodiments of the present application in detail with reference to the accompanying drawings.

[0030] The first embodiment:

[0031] Figure 1 And Figure 4 As shown, a cold-shrinkable outdoor cable sleeve includes an elastic sleeve and a liner spirally wound inside the elastic sleeve. The elastic sleeve includes a straight section 11 and an outer expansion section 12 fixedly connected to the straight section 11. The liner includes an inner spiral tube 31 and a pulling tube strip 32 fixedly connected to the end of the inner spiral tube 31. The end of the pulling tube strip 32 movably penetrates through the elastic sleeve and extends to the outside of the other end of the elastic sleeve. A stress cone 2 is fixedly embedded inside the outer expansion section 12. When in use, the elastic sleeve can be directly sleeved outside the target cable, and then the pulling tube strip 32 is evenly pulled outwards, so that the inner spiral tube 31 gradually collapses, and then the elastic sleeve gradually shrinks, thereby wrapping and binding the cable.

[0032] As Figure 3It is shown that when connected to the outside of the cable, the multiple color-shielding short strips 42 in the multiple measuring shortening array groups conflict with each other in pairs, which can effectively block the indicator color strip 43. It is worth noting that for cables of different sizes, the corresponding elastic sleeves are also different. The arrangement of the multiple color-shielding short strips 42 in the measuring shortening array group in the present invention is based on the standard that after it is shrunk and connected to the outside of the cable, the multiple color-shielding short strips 42 can stably conflict with each other in pairs, so that the application can be more effective in monitoring the contraction of the elastic sleeve. When excessive fatigue occurs, the contraction amplitude will become smaller, and it is difficult for the color-shielding short strips 42 to conflict with each other, thereby achieving a general warning of contraction abnormality, and effectively avoiding contraction abnormalities with smaller abnormal amplitudes that are difficult to detect in the prior art.

[0033] like Figure 2 The outer ends of the straight section 11 and the expanded section 12 are fixedly sleeved with a plurality of uniformly distributed shrinkage monitoring rings 4, the shrinkage monitoring ring 4 includes an outer transparent cover ring 41 fixedly connected to the outer end of the straight section 11 or the expanded section 12, and a plurality of measuring shortening array groups fixedly connected to the outer end of the straight section 11, the plurality of measuring shortening array groups are distributed in a ring array around the axis of the elastic sleeve, and the plurality of measuring shortening array groups are all located on the inner side of the outer transparent cover ring 41, the measuring shortening array group includes a plurality of color-shielding short strips 42 and an indicating color strip 43 coated on the outer surface of the straight section 11, the plurality of color-shielding short strips 42 are fixedly connected to the straight section 11, and two adjacent color-shielding short strips 42 conflict with each other, and the plurality of color-shielding short strips 42 in contact with each other completely cover the indicating color strip 43, the axis of the color-shielding short strip 42 is parallel to the axis of the straight section 11, and the indicating color strip 43 is a high-brightness color, such as Figure 6 and Figure 8 When the outer expansion section 12 contracts, the measuring shortening array group contracts accordingly. When the elastic sleeve has good contraction force, the multiple color-shielding short strips 42 can gradually approach each other until they collide with each other. At this time, they can completely cover the indicator color strip 43 below them, making the indicator color strip 43 lose its color. For the staff, only the multiple groups of color-shielding short strips 42 can be seen on the surface of the elastic sleeve that automatically contracts and connects the target cable. Figure 7 When the elastic sleeve is over-tired and cannot shrink as expected, all or part of the color-shielding short strip 42 will be difficult to shrink accordingly. After the connecting cable is shrunk, part of the indicator color strip 43 will be exposed and colored, thereby giving the staff an early warning of abnormal shrinkage, so that the staff can replace another elastic sleeve in time, effectively avoiding the use of an elastic sleeve with abnormal shrinkage, thereby effectively ensuring the stable transmission of electricity and reducing safety hazards.

[0034] The shading strip 42 includes a central positioning layer 421 and two outer adaptation layers 422 respectively and fixedly connected to both ends of the central positioning layer 421. The outer surfaces of the outer adaptation layer 422 and the central positioning layer 421 are both arc-shaped and have the same curvature. The space enclosed by the outer adaptation layer 422 and the central positioning layer 421 is saturated with liquid filled. The outer adaptation layer 422 is an elastic structure. When multiple shading strips 42 are in contact with each other, the outer adaptation layer 422 can undergo a certain amount of adaptive deformation, so that it is not easy for multiple shading strips 42 to inhibit the contraction of the elastic sleeve, effectively ensuring that it can stably bind and connect to the cable. The central positioning layer 421 is a rigid structure and both are opaque, effectively ensuring that when the shading strips 42 are in contact with each other to cover the indicating color strip 43, the shading strips 42 themselves are not easy to transmit color, and thus effectively ensuring the color loss effect of the indicating color strip 43, so that its color can only be seen through the gap between two when the shading strips 42 are not in contact with each other. And one end of the central positioning layer 421 facing the straight section 11 is processed by cutting, and the cut surface is fixedly attached to the surface of the straight section 11 or the outward expansion section 12, so that the connection between it and the elastic sleeve is a surface connection rather than a point connection, making the shading strip 42 more stable and not easy to separate from the surface of the elastic sleeve due to force.

[0035] In summary, through the setting of the shortening matrix group, when the elastic sleeve contracts and binds the cable, it can give a certain indication of its contraction situation, facilitating the timely detection of the situation where the contraction fails to meet the expectation, enabling the staff to replace the abnormal elastic sleeve in time. Compared with the prior art, the situation where the abnormally contracted elastic sleeve is used is greatly reduced, thereby effectively ensuring the stable transmission of electricity and reducing potential safety hazards.

[0036] The second implementation mode:

[0037] Based on the first implementation mode, this implementation mode adds a detection channel, and the rest is the same as the first implementation mode.

[0038] Figure 9As shown, the central positioning layer 421 includes a transparent layer 51 and a follower core 52 fixedly embedded in the center of the transparent layer 51, a detection channel is arranged between the follower core 52 and the transparent layer 51, and the left and right ends of the detection channel are respectively connected to the space surrounded by the two outer adaptive layers 422 and the central positioning layer 421, and the detection channel includes two horizontal liquid guide holes 501 opened at the left and right ends of the follower core 52, a liquid collecting cavity 502 opened at the center of the follower core 52, a liquid separation slit 503 opened at the upper end of the follower core 52, a vertical liquid guide hole 504 opened in the transparent layer 51, and a liquid expansion slit 505, and the horizontal The liquid guiding hole 501, the liquid collecting cavity 502, the liquid partitioning slit 503, the vertical liquid guiding hole 504 and the liquid expanding slit 505 are connected in sequence, and the liquid collecting cavity 502 and the horizontal liquid guiding hole 501 are also saturated with liquid, and the liquid is a colored liquid, and the colored liquid is also a high-brightness color, and is different from the color of the indicator color strip 43. Since the colored liquid generally appears when the indicator color strip 43 is covered and discolored, the different color setting between it and the indicator color strip 43 can effectively ensure that when it appears in color, it is easy to distinguish it from the indicator color strip 43, so that the staff is not easy to misjudge the contraction of the elastic sleeve.

[0039] The follower core 52 is a non-transparent elastic structure, and the left and right inner walls of the liquid-isolating slit 503 are in conflict with each other, and the color-transmitting layer 51 is a transparent structure. When the multiple color-shielding short strips 42 conflict with each other to block the indicating color strip 43, the multiple color-shielding short strips 42 conflict with each other. At this time, the two outer adaptive layers 422 on both sides of the color-shielding short strip 42 gradually approach the middle, thereby squeezing the colored liquid into the liquid collecting cavity 502 and generating an outward squeezing force on the liquid-isolating slit 503, so that the inner walls that conflict with each other are slightly loosened, so that the colored liquid can cross it and enter the vertical liquid guide hole 504 and the liquid expansion slit 505, so that a new color band is generated on the liquid expansion slit 505. When the contraction force of the elastic sleeve is better, the outer adaptive layer 422 is subjected to a greater force, so that the deformation is greater, and then more colored liquid enters the liquid expansion slit 505. Figure 11 The wider the color band, a1 in the figure indicates the color band produced when the expansion slit 505 is completely filled with colored liquid, a2 indicates the color band produced when the expansion slit 505 is only partially filled with colored liquid when the shrinkage force is good, and a3 indicates the color band when only a very narrow color band or even no colored liquid appears on the expansion slit 505 when the indicator color bar 43 is completely covered. When the staff is installing the cold shrink elastic sleeve and it meets the shrinkage requirements, they can also have a clearer judgment on each shrinkage force.

[0040] The vertical liquid guide hole 504 and the liquid expansion slit 505 form a T-shape, and the side view cross section of the liquid expansion slit 505 is a downwardly concave arc, and the top view cross section of the liquid expansion slit 505 is a long rectangle, such as Figure 10, so that when the colored liquid enters the liquid expansion slit 505 from the vertical liquid guide hole 504 when the shrinkage force of the upward masking short strip 42 is good, the color band on the liquid expansion slit 505 will appear to be continuous and gradually expand from the middle to both sides, and it is not easy to have a discontinuous state where the two sides are colored and the middle is not colored, which is convenient for the staff to intuitively judge the width of the color band, and thus facilitate further judgment of the shrinkage force.

[0041] In summary, when the indicator color strip 43 is completely blocked, in conjunction with the setting of the detection channel, when the contraction situation is displayed, new color strips will be generated on the multiple color-shielding short strips 42, and the stronger the contraction force of the elastic sleeve, the greater the mutual resistance of the multiple color-shielding short strips 42, and the wider and more obvious the color strip will be. Based on this, it can also effectively assist the staff to effectively understand the situation of the sleeve, making it easier for the staff to judge its approximate effective working period, thereby facilitating the setting of different maintenance times according to different situations, thereby further reducing safety hazards.

[0042] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A cold-shrinkable outdoor cable sleeve, characterized in that: It includes an elastic sleeve and a liner spirally wound inside the elastic sleeve. The elastic sleeve includes a straight section (11) and an outwardly expanding section (12) fixedly connected to the straight section (11). The liner includes an inner spiral tube (31) and a pulling tube strip (32) fixedly connected to the end of the inner spiral tube (31). The end of the pulling tube strip (32) movably penetrates the elastic sleeve and extends to the outside of the other end of the elastic sleeve. A stress cone (2) is fixedly embedded inside the outwardly expanding section (12). A plurality of uniformly distributed shrinkage monitoring rings (4) are fixedly sleeved on the outer ends of the straight section (11) and the outwardly expanding section (12). The shrinkage monitoring ring (4) includes an outer transparent cover ring (41) fixedly connected to the outer end of the straight section (11) or the outwardly expanding section (12), and multiple sets of shortening measurement matrix groups fixedly connected to the outer end of the straight section (11). The multiple shortening measurement matrix groups are arranged in an annular array around the axis of the elastic sleeve, and all the multiple shortening measurement matrix groups are located inside the outer transparent cover ring (41).

2. The cold-shrinkable outdoor cable sleeve according to claim 1, wherein: The shortening measurement matrix group includes a plurality of shading strips (42) and an indicating color strip (43) coated on the outer surface of the straight section (11). The plurality of shading strips (42) are all fixedly connected to the straight section (11), and adjacent two of the shading strips (42) are in contact with each other. The plurality of mutually contacting shading strips (42) completely cover the indicating color strip (43). The axis of the shading strip (42) is parallel to the axis of the straight section (11). The indicating color strip (43) is a high-brightness color.

3. The cold-shrinkable outdoor cable sleeve according to claim 2, wherein: The shading strip (42) includes a central positioning layer (421) and two outer adaptation layers (422) respectively fixedly connected to both ends of the central positioning layer (421). The outer surfaces of the outer adaptation layer (422) and the central positioning layer (421) are both arc-shaped and have the same curvature. The space enclosed by the outer adaptation layer (422) and the central positioning layer (421) is saturated with a liquid filled.

4. A cold-shrinkable outdoor cable sleeve according to claim 3, characterized in that: The outer adaptation layer (422) is an elastic structure, and one end of the central positioning layer (421) facing the straight section (11) is subjected to a cutting process, and the cut surface is fixedly attached to the surface of the straight section (11) or the outwardly expanding section (12).

5. The cold-shrinkable outdoor cable sleeve according to claim 3, characterized in that: The central positioning layer (421) includes a color-permeable layer (51) and a follow-up core (52) fixedly embedded at the center of the color-permeable layer (51). A detection channel is provided between the follow-up core (52) and the color-permeable layer (51). The left and right ends of the detection channel are respectively communicated with the spaces enclosed by the two outer adaptation layers (422) and the central positioning layer (421).

6. The cold-shrinkable outdoor cable sleeve according to claim 5, characterized in that: The detection channel includes two horizontal liquid guide holes (501) drilled at the left and right ends of the follower core (52), a liquid collecting cavity (502) drilled at the center of the follower core (52), a liquid separating slit (503) drilled at the upper end of the follower core (52), a vertical liquid guide hole (504) drilled in the color-permeable layer (51), and an expanded liquid slit (505). The horizontal liquid guide holes (501), the liquid collecting cavity (502), the liquid separating slit (503), the vertical liquid guide hole (504), and the expanded liquid slit (505) are communicated in sequence. The liquid collecting cavity (502) and the horizontal liquid guide holes (501) are also saturated with a liquid, and the liquid is a colored liquid. The colored liquid is also a high-brightness color and is different from the color of the indicating color bar (43).

7. The cold-shrinkable outdoor cable sleeve according to claim 6, characterized in that: The follower core (52) is a non-transparent elastic structure, and the left and right inner walls of the liquid separating slit (503) are in contact with each other. The color-permeable layer (51) is a transparent structure.

8. The cold-shrinkable outdoor cable sleeve according to claim 7, characterized in that: The vertical liquid guide hole (504) and the expanded liquid slit (505) form a T shape. The side view cross-section of the expanded liquid slit (505) is an arc-shaped depression, and the top view cross-section of the expanded liquid slit (505) is a long rectangle.

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