Double-layer cold shrinkage sleeve

Abstract

The utility model provides a double-layer cold shrink sleeve, which belongs to the technical field of cold shrink sleeves and comprises an outer tube. The necking pipe is fixedly connected to one end of the outer pipe; the inner pipe is fixedly connected between the inner walls of the outer pipe, the inner pipe and the outer pipe are axially concentric, and the inner pipe is connected with the necking pipe; the reel pipe is inserted into the gap between the outer pipe and the inner pipe, one end of the reel pipe is fixedly connected with a connecting strip, the multiple guiding blocks are used for guiding the cable end to the position between the inner pipe and the necking pipe, the cable end is prevented from extruding and pulling the reel pipe, the reel pipe is prevented from being broken in the inserting process, and the cold shrinkage sleeve is prevented from being shrunk in advance; the reelpipe is difficult to draw out from the gap of the double-layer cold shrink sleeve, support fragments are prevented from existing after the double-layer cold shrink sleeve is constructed, and the sealing performance of the double-layer cold shrink sleeve is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cold shrink sleeves, and in particular relates to a double-layer cold shrink sleeve. Background Art

[0002] Cold shrink tubing generally refers to cold shrink cable accessories. Cold shrink cable accessories are made of elastomeric materials (commonly used are silicone rubber and EPDM rubber) that are injection vulcanized in the factory, and then expanded and lined with plastic spiral supports to form various cable accessories. During on-site installation, these pre-expanded parts are put on the treated cable ends or joints, and the internal supporting plastic spiral strips (supports) are pulled out and pressed against the cable insulation to form cable accessories. Because it relies on elastic retraction force at room temperature, rather than being heated and shrunk by fire like heat shrink cable accessories, it is commonly known as cold shrink cable accessories.

[0003] Double-layer cold shrink tubing is a special tubing structure, which is composed of two tubings with different materials or characteristics. It is usually used for the protection and sealing of cable connectors, power cable joints or other types of cable joints.

[0004] The authorization publication number "CN211074925U" records "a double-layer cold shrink sleeve. The double-layer cold shrink sleeve includes: a support tube, a silicone rubber layer, and an EPDM rubber layer; extending radially outward along the support tube, the support tube, the silicone rubber layer and the EPDM rubber cold shrink layer are arranged in sequence; the silicone rubber layer is closed to form a silicone rubber cold shrink tube, and the EPDM rubber layer is closed to form an EPDM rubber cold shrink tube; the ratio of the inner diameter of the EPDM rubber cold shrink tube to the inner diameter of the silicone rubber cold shrink tube is k, 1≤k≤1.5; the length of the silicone rubber cold shrink tube is equal to that of the EPDM rubber cold shrink tube. The waterproof grade of the cold shrink sleeve can reach the highest IPX8 waterproof grade. Moreover, the sleeve can still maintain the consistency of the shrinkage performance of the inner and outer layers below -20°C, and can still provide effective waterproof sealing protection function at low temperatures."

[0005] The double-layer cold shrink tubing in the above patent has good low temperature resistance, resilience and physical mechanical properties. The new double-layer cold shrink tubing solves the problem of inconsistent shrinkage of EPDM cold shrink tubing and silicone cold shrink tubing. The EPDM cold shrink tubing shrinks more slowly, and the double-layer cold shrink tubing that meets the inner diameter ratio coefficient k can provide a greater radial clamping force to the inner silicone cold shrink tubing of equal length through the outer EPDM rubber layer, and cooperate with the inner silicone rubber cold shrink tubing to provide better waterproof sealing protection function, so that the waterproof grade of the cold shrink tubing can reach the highest IPX8 waterproof grade. Moreover, the sleeve can still maintain the consistency of the shrinkage performance of the inner and outer layers below -20℃, and can still provide effective waterproof sealing protection function at low temperatures. However, in actual use, when the double-layer cold shrink sleeve is plugged into the cable end, the cable end is very easy to squeeze and pull the support, causing the support to break during the plugging process, and then causing the cold shrink sleeve to shrink prematurely, making it difficult to withdraw the support from the gap of the double-layer cold shrink sleeve, resulting in support fragments after the construction of the double-layer cold shrink sleeve, resulting in reduced sealing of the double-layer cold shrink sleeve. For this reason, we propose a double-layer cold shrink sleeve. Utility Model Content

[0006] The utility model aims to provide a double-layer cold shrink sleeve, which aims to solve the problem that when the double-layer cold shrink sleeve is plugged into the cable end, the cable end is very likely to squeeze and pull the support, causing the support to break during the plugging process, which in turn causes the cold shrink sleeve to shrink prematurely, making it difficult to extract the support from the gap of the double-layer cold shrink sleeve, resulting in the presence of support fragments after the construction of the double-layer cold shrink sleeve, resulting in reduced sealing of the double-layer cold shrink sleeve.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A double-layer cold shrink sleeve comprises an outer tube;

[0009] A shrinking tube, wherein the shrinking tube is fixedly connected to one end of the outer tube;

[0010] An inner tube, the inner tube is fixedly connected between the inner walls of the outer tube, the inner tube is axially concentric with the outer tube, and the inner tube is connected to the shrinking tube;

[0011] The coiled tube is inserted into the gap between the outer tube and the inner tube, and one end of the coiled tube is fixedly connected with a connecting strip.

[0012] As a preferred solution of the utility model, a dust blocking pipe is fixedly connected to the side end of the shrinking tube.

[0013] As a preferred solution of the utility model, a sealing ring is fixedly connected to the circumferential inner wall of the inner tube, and the sealing ring is pressed against the outer tube and the coiled tube.

[0014] As a preferred solution of the utility model, a ring frame is fixedly connected to the circumferential surface of the outer tube, the ring frame is connected to the connecting strip, and a plurality of guide blocks are fixedly connected to the circumferential surface of the ring frame, and the plurality of guide blocks extend into the inner tube.

[0015] As a preferred solution of the utility model, a plurality of reinforcing strips are fixedly connected to the circumferential surface of the outer tube.

[0016] As a preferred solution of the utility model, a plurality of reinforcing strips are fixedly connected to the circumferential surface of the outer tube.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] 1. In this solution, multiple guide blocks are used to guide the cable end to between the inner tube and the shrink tube, to avoid squeezing and pulling of the cable end on the reel tube, to prevent the reel tube from breaking during the plug-in process, to prevent the shrink tube from shrinking prematurely, to facilitate the reel tube from being difficult to pull out from the gap of the double-layer shrink tube, to prevent the presence of support fragments after the construction of the double-layer shrink tube, and to improve the sealing of the double-layer shrink tube.

[0019] 2. In this solution, the dust blocking tube is used to prevent dust and water vapor from contacting the cable ends when the cables are connected, thereby preventing oxidation corrosion at the connecting points of the cable ends. The sealing ring is used to fit with the circumferential surface of the cable to prevent dust and water vapor from penetrating through the gap between the outer tube and the cable to the cable ends, thereby preventing dust and water vapor from oxidizing and corroding the cable ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 This is a first-view stereoscopic diagram of a double-layer cold shrink sleeve of the utility model;

[0022] Figure 2 This is a second perspective stereogram of a double-layer cold shrink sleeve of the utility model;

[0023] Figure 3 It is a half-section diagram of a double-layer cold shrink sleeve of the utility model;

[0024] Figure 4 This is a full cross-sectional view of a double-layer cold shrink sleeve of the utility model;

[0025] Figure 5 The utility model is a double-layer cold shrink sleeve Figure 4 A magnified image of point A;

[0026] Figure 6The utility model is an exploded view of a double-layer cold shrink sleeve.

[0027] In the figure: 1. outer tube; 2. inner tube; 3. shrink tube; 4. dust-blocking tube; 5. sealing ring; 6. reel tube; 7. ring frame; 8. connecting strip; 9. guide block; 10. reinforcement strip. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example 1

[0030] Reference Figure 1 - Figure 6 , a double-layer cold shrink tubing, comprising:

[0031] Outer tube 1;

[0032] A shrink tube 3, which is fixedly connected to one end of the outer tube 1;

[0033] The inner tube 2 is fixedly connected to the inner wall of the outer tube 1, the inner tube 2 is axially concentric with the outer tube 1, and the inner tube 2 is connected to the shrinking tube 3;

[0034] The coiled tube 6 is inserted into the gap between the outer tube 1 and the inner tube 2 , and one end of the coiled tube 6 is fixedly connected with a connecting strip 8 .

[0035] In the utility model, the outer tube 1 is used to wrap the cable end, the shrinking tube 3 is used to shrink and guide the cable, the inner tube 2 is used to prevent the cable end from contacting the winding tube 6, the winding tube 6 is used to prevent the shrinkage of the outer tube 1, and the connecting strip 8 is used to pull and tear the winding tube 6 so that the winding tube 6 can be pulled out from between the outer tube 1 and the inner tube 2.

[0036] The side end of the shrink pipe 3 is fixedly connected with a dust blocking pipe 4 .

[0037] In the utility model, the dust blocking tube 4 is used to block dust and water vapor from contacting the cable ends when the cables are butt-jointed, thereby preventing oxidation corrosion to the butt joint of the cable ends.

[0038] A sealing ring 5 is fixedly connected to the circumferential inner wall of the inner tube 2 , and the sealing ring 5 presses the outer tube 1 and the coiled tube 6 .

[0039] In the present invention, the sealing ring 5 is used to fit with the circumferential surface of the cable to prevent dust and water vapor from penetrating through the outer tube 1 and the cable gap to the cable end, thereby preventing dust and water vapor from oxidizing and corroding the cable end.

[0040] A ring frame 7 is fixedly connected to the circumferential surface of the outer tube 1 , and the ring frame 7 is connected to a connecting strip 8 . A plurality of guide blocks 9 are fixedly connected to the circumferential surface of the ring frame 7 , and the plurality of guide blocks 9 extend into the inner tube 2 .

[0041] In the utility model, the ring frame 7 is used to support and fix multiple guide blocks 9, and the multiple guide blocks 9 are used to guide the cable end to between the inner tube 2 and the shrinking tube 3, so as to avoid the cable end from squeezing and pulling the reel tube 6, prevent the reel tube 6 from breaking during the plug-in process, avoid the shrinkage of the cold shrink sleeve in advance, facilitate the reel tube 6 to be difficult to be pulled out from the gap of the double-layer cold shrink sleeve, prevent the existence of support fragments after the construction of the double-layer cold shrink sleeve, and improve the sealing of the double-layer cold shrink sleeve.

[0042] A plurality of reinforcement strips 10 are fixedly connected to the circumferential surface of the outer tube 1 .

[0043] In the present invention, the plurality of reinforcement strips 10 are used to strengthen the structural strength of the outer tube 1 , and the plurality of reinforcement strips 10 are used to support the outer tube 1 .

[0044] The coil tube 6 is embedded with an elastic steel wire.

[0045] In the utility model, an elastic steel wire is embedded in the coil tube 6 to ensure that the coil tube 6 will not break.

[0046] The working process of a double-layer cold shrink sleeve provided by the utility model is as follows:

[0047] Insert the cable end between the plurality of guide blocks 9, which are used to guide the cable end. The cable end is inserted into the inner tube 2 along the plurality of guide blocks 9, so that the cable end is drilled out from the contraction end of the contraction tube 3, and then the connecting strip 8 is pulled to make the plurality of guide blocks 9 be pulled out from the inner tube 2. At the same time, the connecting strip 8 pulls one end of the reel 6, so that the reel 6 is torn into a strip along the gap between the outer tube 1 and the inner tube 2 and then the outer tube 1 squeezes and contracts the sealing ring 5, and the sealing ring 5 shrinks and squeezes the cable end, and then fills the outer tube 1 and the cable end. The gap between the wires can prevent dust and water vapor from penetrating into the cable end through the outer tube 1 and the cable gap, and prevent dust and water vapor from oxidizing and corroding the cable end. At the same time, multiple guide blocks 9 are used to guide the cable end to between the inner tube 2 and the shrinking tube 3, to avoid the cable end from squeezing and pulling the reel tube 6, to prevent the reel tube 6 from breaking during the plug-in process, to avoid the cold shrinkage tube from shrinking prematurely, to facilitate the reel tube 6 to be difficult to be pulled out from the gap of the double-layer cold shrinkage tube, to prevent the presence of support fragments after the construction of the double-layer cold shrinkage tube, and to improve the sealing of the double-layer cold shrinkage tube.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A double-layer cold shrink sleeve, characterized in that: include; Outer tube (1); A shrinking tube (3), wherein the shrinking tube (3) is fixedly connected to one end of the outer tube (1); An inner tube (2), the inner tube (2) being fixedly connected between the inner walls of the outer tube (1), the inner tube (2) being axially concentric with the outer tube (1), and the inner tube (2) being connected to the shrinking tube (3); A coiled tube (6) is inserted into the gap between the outer tube (1) and the inner tube (2), and one end of the coiled tube (6) is fixedly connected to a connecting strip (8).

2. A double-layer cold shrink sleeve according to claim 1, characterized in that: The side end of the shrink tube (3) is fixedly connected to a dust blocking tube (4).

3. A double-layer cold shrink sleeve according to claim 2, characterized in that: A sealing ring (5) is fixedly connected to the circumferential inner wall of the inner tube (2), and the sealing ring (5) is pressed against the outer tube (1) and the coiled tube (6).

4. A double-layer cold shrink sleeve according to claim 3, characterized in that: A ring frame (7) is fixedly connected to the circumferential surface of the outer tube (1), the ring frame (7) is connected to a connecting strip (8), a plurality of guide blocks (9) are fixedly connected to the circumferential surface of the ring frame (7), and the plurality of guide blocks (9) extend into the inner tube (2).

5. A double-layer cold shrink sleeve according to claim 4, characterized in that: A plurality of reinforcement strips (10) are fixedly connected to the circumferential surface of the outer tube (1).

6. A double-layer cold shrink sleeve according to claim 5, characterized in that: The coiled tube (6) is embedded with an elastic steel wire.

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