Composite cold shrink cable terminal

Abstract

The utility model relates to the technical field of cold-shrink cable terminals, in particular to a composite cold-shrink cable terminal, which comprises an umbrella skirt, an insulating sleeve is fixedly connected to the inner side of the umbrella skirt, a stress control tube with a high dielectric constant is arranged on the inner side of the insulating sleeve, a sealing sleeve is arranged on the inner side of the stress control tube, and the sealing sleeve is fixedly connected with the umbrella skirt. A group of sealing sleeves are arranged on the base, a stress control sleeve with a high dielectric constant is fixedly connected between the group of sealing sleeves, and plastic spiral supporting strips are arranged on the inner sides of the sealing sleeves. The arc-shaped positioning blocks, the damping rods, the connecting shaft rods and the like are placed on the inner sides of the plastic spiral supporting strips, the supporting effect of the plastic spiral supporting strips can be enhanced through the arc-shaped positioning blocks, materials cannot be rigidly limited through cooperation of the damping rods and the springs, and therefore the situation that shrinkage is not in place due to material fatigue is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of cold shrink cable terminals, in particular to a composite cold shrink cable terminal. Background Art

[0002] The cold shrink cable terminal head is a component of various cable accessories made of elastomeric materials that are injection-vulcanized in the factory, and then expanded and lined with plastic spiral supports. During on-site installation, these composite pre-expanded parts are put on the treated cable ends or joints, and the internal supporting plastic spiral strips are pulled out. The composite cold shrink cable terminal is pressed against the cable insulation to form a cable accessory. Because it relies on elastic retraction force at room temperature, rather than shrinking by heating like heat shrink cable accessories, it is commonly known as cold shrink cable accessories.

[0003] The storage period of common composite cold shrink cable terminals is relatively short, generally half a year to two years, because the composite cold shrink cable terminals are pre-expanded. When the inner supports are stored for a long time, the supports may fall off or the material may fatigue, resulting in incomplete shrinkage. Therefore, a composite cold shrink cable terminal is proposed to address the above problems. Utility Model Content

[0004] The utility model aims to provide a composite cold shrink cable terminal to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A composite cold shrink cable terminal comprises an umbrella skirt, an insulating sleeve is fixedly connected to the inner side of the umbrella skirt, a stress control tube with a high dielectric constant is arranged on the inner side of the insulating sleeve, a sealing sleeve is arranged on the inner side of the stress control tube, a group of stress control sleeves are fixedly connected with a stress control sleeve with a high dielectric constant, a plastic spiral support strip is arranged on the inner side of the sealing strip, arc-shaped positioning blocks of equal size are arranged on the inner side of the plastic spiral support strip, a damping rod is fixedly connected to the inner wall of the arc-shaped positioning block, one end of the damping rod away from the arc-shaped positioning block is fixedly connected to a connecting shaft rod, a spring is sleeved on the outer side of the damping rod, one end of the connecting shaft rod is fixedly connected to a limiting block, and a pull ring is fixedly connected to the outer side of the limiting block.

[0007] Preferably, there are 12 arc-shaped positioning blocks in total, and the arc-shaped positioning blocks are divided into three layers and arranged on the outside of the connecting shaft in an array with the same center and equal angles.

[0008] Preferably, two ends of the spring are fixedly connected to the arc-shaped positioning block and the connecting shaft rod respectively, and the connecting shaft rod is arranged on the inner side of the plastic spiral support strip.

[0009] Preferably, the cross section of the limit block is circular, and the limit block is arranged on the outside of the plastic spiral support strip.

[0010] Preferably, the stress control sleeve is arranged between the plastic spiral support strip and the stress control tube, and the sealing sleeve is sleeved on the outer side of the plastic spiral support strip.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] In the utility model, a structure consisting of an arc-shaped positioning block, a damping rod, a spring and a connecting shaft rod is provided, and the arc-shaped positioning block, the damping rod and the connecting shaft rod are placed on the inner side of the plastic spiral support strip, so that the arc-shaped positioning block can strengthen the supporting effect of the plastic spiral support strip, and the cooperation of the damping rod and the spring makes it possible not to rigidly limit the material, thereby reducing the occurrence of insufficient shrinkage due to material fatigue. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the cross-sectional structure of the insulating sleeve of the utility model;

[0015] Figure 3 For this utility model Figure 2 A schematic diagram of the structure at A;

[0016] Figure 4 It is a schematic diagram of the three-dimensional structure of the arc-shaped positioning block of the utility model.

[0017] In the figure: 1. umbrella skirt; 2. insulating sleeve; 3. stress control tube; 4. sealing sleeve; 5. stress control sleeve; 6. plastic spiral support strip; 7. arc-shaped positioning block; 8. damping rod; 9. spring; 10. connecting shaft rod; 11. limit block; 12. pull ring. DETAILED DESCRIPTION

[0018] 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.

[0019] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0020] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0021] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0022] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0023] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0024] See also Figure 1-4 , the utility model provides a technical solution:

[0025] A composite cold shrink cable terminal comprises an umbrella skirt 1, an insulating sleeve 2 is fixedly connected to the inner side of the umbrella skirt 1, a stress control tube 3 with a high dielectric constant is arranged on the inner side of the insulating sleeve 2, a sealing sleeve 4 is arranged on the inner side of the stress control tube 3, a group of sealing sleeves 4 are fixedly connected with a stress control sleeve 5 with a high dielectric constant, a plastic spiral support strip 6 is arranged on the inner side of the sealing sleeve 4, arc-shaped positioning blocks 7 of equal size are arranged on the inner side of the plastic spiral support strip 6, a damping rod 8 is fixedly connected to the inner wall of the arc-shaped positioning block 7, one end of the damping rod 8 away from the arc-shaped positioning block 7 is fixedly connected to a connecting shaft rod 10, a spring 9 is sleeved on the outer side of the damping rod 8, one end of the connecting shaft rod 10 is fixedly connected to a limiting block 11, and a pull ring 12 is fixedly connected to the outer side of the limiting block 11.

[0026] There are 12 arc-shaped positioning blocks 7 in total. The arc-shaped positioning blocks 7 are divided into three layers and are arranged at the outside of the connecting shaft 10 in an array with the same center and equal angles. This arrangement enables the arc-shaped positioning blocks 7 to act on the plastic spiral support strip 6 to reinforce it, thereby reducing the possibility of the plastic spiral support strip 6 scattering due to long-term storage; the two ends of the spring 9 are fixedly connected to the arc-shaped positioning blocks 7 and the connecting shaft 10 respectively, and the connecting shaft 10 is arranged on the inner side of the plastic spiral support strip 6. This arrangement enables the damping rod 8 and the spring 9 to cooperate so that the material will not be rigidly limited, thereby reducing the occurrence of the situation where the material fatigue causes the shrinkage to be not in place; the cross-section of the limit block 11 is circular, and the limit block 11 is arranged on the outside of the plastic spiral support strip 6. This arrangement enables the positioning of the limit block 11, so that the limit block 11 can limit the connecting shaft 10; the stress control sleeve 5 is arranged between the plastic spiral support strip 6 and the stress control tube 3, and the sealing sleeve 4 is sleeved on the outside of the plastic spiral support strip 6. This arrangement improves the sealing of the cable end or joint.

[0027] Workflow: In the process of producing composite cold shrink cable terminals, after the vulcanization molding of the composite cold shrink cable terminals is completed, the plastic spiral support strip 6 is sleeved on the outside of the arc-shaped positioning block 7. When the limit block 11 fits with the port of the plastic spiral support strip 6, the placement of the arc-shaped positioning block 7, the damping rod 8 and the connecting shaft rod 10 are completed. After the stress control sleeve 5 is expanded by the instrument, the plastic spiral support strip 6 together with the arc-shaped positioning block 7 are placed on the inner side of the expanded stress control sleeve 5, thereby realizing the pre-expansion of the composite cold shrink cable terminal. When the composite cold shrink cable terminal is not sleeved on the cable end or joint, the arc-shaped positioning block 7 acts on the plastic spiral support strip 6 to reinforce it, reducing the possibility of the plastic spiral support strip 6 scattering due to long-term storage. At the same time, the arc-shaped positioning block 7 acts on the damping rod 8 and the spring 9. The cooperation of the damping rod 8 and the spring 9 prevents the material from being rigidly limited, reducing the occurrence of insufficient shrinkage due to material fatigue. When When the composite cold shrink cable terminal is to be used, the limit block 11 and the connecting shaft 10 are moved by pulling the pull ring 12, so that the arc positioning block 7 is separated from the plastic spiral support strip 6. During this process, the damping rod 8 and the spring 9 will shrink, so that the arc positioning block 7 is easy to separate from the plastic spiral support strip 6, and then the plastic spiral support strip 6 together with the stress control sleeve 5, the sealing sleeve 4, the stress control tube 3 and the insulating sleeve 2 are sleeved on the cable end or joint. After the sleeve connection is completed, the plastic spiral support strip 6 is spread out, and the plastic spiral support strip 6 is pulled to spirally withdraw from the stress control sleeve 5 in circles, that is, the installation of the cold shrink cable terminal head is completed. The elastic retraction force of the stress control tube 3 and the stress control sleeve 5 makes the stress control sleeve 5 and the sealing sleeve 4 fit with the cable end or joint. The sealing sleeve 4 improves the sealing of the cable end or joint. The insulating sleeve 2 provides insulation safety for the cable end or joint. The umbrella skirt 1 prevents rainwater and stains from adhering to the surface of the terminal head to cause flashover.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite cold shrink cable terminal, comprising an shed (1), characterized in that: An insulating sleeve (2) is fixedly connected to the inner side of the umbrella skirt (1), a stress control tube (3) with a high dielectric constant is arranged on the inner side of the insulating sleeve (2), a sealing sleeve (4) is arranged on the inner side of the stress control tube (3), a stress control sleeve (5) with a high dielectric constant is fixedly connected between a group of the sealing sleeves (4), a plastic spiral support strip (6) is arranged on the inner side of the sealing sleeve (4), arc-shaped positioning blocks (7) of equal size are arranged on the inner side of the plastic spiral support strip (6), a damping rod (8) is fixedly connected to the inner wall of the arc-shaped positioning block (7), one end of the damping rod (8) away from the arc-shaped positioning block (7) is fixedly connected to a connecting shaft rod (10), a spring (9) is sleeved on the outer side of the damping rod (8), one end of the connecting shaft rod (10) is fixedly connected to a limiting block (11), and a pull ring (12) is fixedly connected to the outer side of the limiting block (11).

2. A composite cold shrink cable terminal according to claim 1, characterized in that: There are 12 arc-shaped positioning blocks (7) in total. The arc-shaped positioning blocks (7) are divided into three layers and arranged in an array with the same center and equal angles on the outside of the connecting shaft (10).

3. The composite cold shrink cable terminal according to claim 1, characterized in that: The two ends of the spring (9) are respectively fixedly connected to the arc-shaped positioning block (7) and the connecting shaft (10), and the connecting shaft (10) is arranged on the inner side of the plastic spiral support strip (6).

4. The composite cold shrink cable terminal according to claim 1, characterized in that: The cross section of the limiting block (11) is circular, and the limiting block (11) is arranged on the outside of the plastic spiral support strip (6).

5. The composite cold shrink cable terminal according to claim 1, characterized in that: The stress control sleeve (5) is arranged between the plastic spiral support strip (6) and the stress control tube (3), and the sealing sleeve (4) is sleeved on the outside of the plastic spiral support strip (6).

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