Fireproof power cable

Abstract

The utility model relates to the technical field of power cables, in particular to a fire-resistant power cable, which comprises a cable main body and a sleeve sleeved on the surface of the cable main body, and is characterized in that a clamping and fixing assembly comprises an arc-shaped clamping sheet which is telescopically and slidably mounted on the inner wall of the sleeve and is used for clamping the cable main body, and further comprises a clamping and fixing assembly which rotates synchronously with the arc-shaped clamping sheet; the arc-shaped clamping strips are installed on the outer sleeve wall of the sleeve in a rotating mode and used for clamping the cable body, the cable body is extruded through rotation of the arc-shaped clamping strips, so that the cable end and the cable body are locked and fixed, the cable end is not prone to loosening and falling off, laying and installation of the cable are preliminarily facilitated, and along with clamping and fixing of the multiple arc-shaped clamping strips, the cable end is prevented from falling off. The arc-shaped clamping pieces located in the sleeve are pushed by the spring and are pressed against the surface of the cable end, so that the sleeve and the cable end are locked and fixed, and the laying and installation of the cable are further facilitated in cooperation with the locking and fixing of the arc-shaped clamping strips.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a fire-resistant power cable. Background Art

[0002] With the acceleration of my country's economic construction, medium-voltage power distribution systems in important places such as high-rise buildings, subways, tunnels, power plants and nuclear power plants have put forward higher requirements for the safety of power cables under fire conditions. It is imperative to use fire-resistant and flame-retardant cables for power supply. Fire-resistant and flame-retardant power cables must not only be flame-retardant and fire-resistant under flame or high temperature conditions, but also have high thermal insulation to ensure that the internal insulation of the cable is not damaged under external high temperature conditions, and can ensure that the power supply line is powered normally within the predetermined time, and no toxic and harmful gases will be generated due to combustion. The fire-retardant technology of cables has attracted more and more attention.

[0003] The Chinese utility model patent with the authorization announcement number "CN211788306U" is specifically "a fire-resistant power cable". The specific implementation method of its specification records that "under the condition of external high-temperature flame, heat is transferred from the outside to the inside of the power cable, and the inner protective sheath and the outer protective sheath play a dual flame retardant and fire-resistant effect, wherein the outer fire-resistant layer and the inner fire-resistant layer play the main flame retardant and fire-resistant role; if the power cable cracks and the cracks penetrate the flame retardant and fire-resistant layer (both the inner protective sheath and the outer protective sheath are cracked), the section of the outer protective sheath where the crack is located is rotated by a certain angle so that the cracks on the outer protective sheath are separated and staggered from the cracks on the inner protective sheath, the cracks on the inner side of the outer protective sheath can be protected by the outer protective sheath, and the inner protective sheath can prevent the high temperature from invading from the cracks of the outer protective sheath, so that the power cable can still play a flame retardant and fire-resistant effect";

[0004] The above-mentioned device makes the internal conductors of the cable flame retardant and fire resistant by providing an outer fire-resistant layer and an inner fire-resistant layer, and by rotating the protective sleeve, the cracks generated on the inner and outer protective sleeves are separated and staggered, thereby continuously ensuring the fire-resistant and flame-retardant properties. However, the above-mentioned device does not lock and fix the cable ends. When the cable is laid and used, there is no limit fixation at the cable ends. When the cable is used for too many turns and the squeezing and binding force between them is reduced, it is easy to cause the cable wrapped on the cable reel to loosen and fall off, causing inconvenience to the laying and installation of the cable. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the utility model provides a fire-resistant power cable, which can effectively solve the problem that the prior art is inconvenient to install and lay.

[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The utility model provides a fire-resistant power cable, comprising a cable body and a sleeve sleeved on the surface of the cable body, a clamping and fixing component comprising an arc-shaped clamping piece telescopically slidably mounted on the inner wall of the sleeve to clamp the cable body, and also comprising an arc-shaped clamping strip which rotates synchronously with the arc-shaped clamping piece and is rotatably mounted on the outer wall of the sleeve to clamp the cable body.

[0008] Furthermore, the cable body includes a fire-resistant outer sheath, the inner annular wall of the fire-resistant outer sheath is wrapped with a wrapping tape, the inner annular wall of the wrapping tape is wrapped with a fire-resistant inner sheath, a plurality of wire assemblies are arranged in the fire-resistant inner sheath, and a filling layer is arranged between the wire assemblies and the fire-resistant inner sheath.

[0009] Furthermore, the wire assemblies each include a conductor, a soft copper tape is sheathed on the surface of the conductor, and an insulating layer is sheathed on the surface of the soft copper tape.

[0010] Furthermore, sliding holes are formed through both ends of the sleeve, a plurality of balls are embedded in the inner wall of the sliding holes for rolling installation, an arc-shaped hole is formed through the sliding holes on the outer wall of the sleeve for facilitating the rotation of the arc-shaped clamping strip, and a handle is fixedly installed on the top of the sleeve.

[0011] Furthermore, a spring is installed between the top of the arc-shaped clamping piece and the inner wall of the sliding hole, and a pulling handle is installed on the top of the arc-shaped clamping piece, which extends through the outer wall of the sleeve and is opposite to the grip position.

[0012] Furthermore, an L-shaped rack is installed at the bottom of the arc-shaped clamping piece, and a gear meshingly connected with the corresponding L-shaped rack is fixedly installed at one end of the arc-shaped clamping strip extending into the sleeve.

[0013] Compared with the known prior art, the technical solution provided by the utility model has the following beneficial effects:

[0014] 1. First, a sleeve is installed at the cable end, and several arc-shaped clamping strips are rotated and installed on the outer wall of the sleeve. The arc-shaped clamping strips are rotated to squeeze the cable body, so that the cable end and the body are locked and fixed, so that the cable end is not easy to loosen and fall off, which is initially convenient for laying and installing the cable;

[0015] 2. With the clamping and fixing of several arc-shaped clamping strips, the arc-shaped clamping piece in the sleeve is pushed by the spring and squeezed against the surface of the cable end, so that the sleeve and the cable end are locked and fixed, and the locking and fixing of the arc-shaped clamping strips further facilitates the laying and installation of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 For the utility model Figure 1 The enlarged structural diagram at A in the middle;

[0019] Figure 3 This is a schematic diagram of the sleeve structure of the utility model;

[0020] Figure 4 It is a schematic diagram of the structure of the clamping and fixing assembly of the utility model.

[0021] The numbers in the figure represent: 1. Cable body; 11. Fire-resistant outer sheath; 12. Tape; 13. Fire-resistant inner sheath; 14. Filling layer; 15. Wire assembly; 2. Sleeve; 21. Sliding hole; 22. Ball; 23. Arc hole; 24. Handle; 31. Arc clamping piece; 32. Spring; 33. Pulling handle; 34. L-shaped rack; 35. Arc clamping strip; 36. Gear. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of 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.

[0023] The utility model is further described below in conjunction with embodiments. Example 1

[0024] Reference Figure 1-4, which is the first embodiment of the utility model, discloses a fire-resistant power cable, including a cable body 1 and a sleeve 2 sleeved on the surface of the cable body 1, the clamping and fixing assembly includes an arc-shaped clamping piece 31 telescopically slidably installed on the inner wall of the sleeve 2 to clamp the cable body 1, and also includes an arc-shaped clamping bar 35 that rotates synchronously with the arc-shaped clamping piece 31 and is rotatably installed on the outer wall of the sleeve 2 to clamp the cable body 1. Since the arc-shaped clamping piece 31 and the arc-shaped clamping bar 35 move synchronously, it has the advantage of simple and convenient operation. Example 2

[0025] Reference Figure 1-4 , which is the second embodiment of the utility model. This embodiment is different from the first embodiment in that: the cable body 1 includes a fire-resistant outer sheath 11, the inner ring wall of the fire-resistant outer sheath 11 is wrapped with a tape 12, the inner ring wall of the tape 12 is wrapped with a fire-resistant inner sheath 13, the inner and outer protective sheaths are made of flame-retardant materials, a plurality of wire assemblies 15 are arranged in the fire-resistant inner sheath 13, a filling layer 14 is arranged between the wire assemblies 15 and the fire-resistant inner sheath 13, the wire assemblies 15 all include conductors, the surface of the conductors is covered with a soft copper strip, the surface of the soft copper strip is covered with an insulating layer, sliding holes 21 are opened at both ends of the sleeve 2, and a plurality of balls 22 are embedded in the inner hole wall of the sliding hole 21 to reduce the cable body 1 in the process of wire pulling and moving. In order to prevent wear, an arc-shaped hole 23 is opened on the outer wall of the sleeve 2 through the sliding hole 21 to facilitate the rotation of the arc-shaped clamping strip 35. A handle 24 is fixedly installed on the top of the sleeve 2 to facilitate the gripping and fixing of the sleeve 2. A spring 32 is installed between the top of the arc-shaped clamping piece 31 and the inner hole wall of the sliding hole 21 to provide a power source for the telescopic activity. A lifting handle 33 is installed on the top of the arc-shaped clamping piece 31, which extends through the outer wall of the sleeve 2 and is opposite to the handle 24. On the premise of holding the handle 24 with one hand, the lifting handle 33 can continue to be pulled. An L-shaped rack 34 is installed at the bottom of the arc-shaped clamping piece 31, and a gear 36 meshing with the corresponding L-shaped rack 34 is fixedly installed on one end of the arc-shaped clamping strip 35 extending into the sleeve 2.

[0026] The remaining structures are the same as those of Example 1.

[0027] The workflow of this utility model is as follows:

[0028] First, hold the grip 24 and pull the lifting handle 33, thereby pulling the corresponding spring 32 to compress and pull the arc-shaped clamping piece 31 upward. As the arc-shaped clamping piece 31 is pulled upward, the L-shaped rack 34 is driven to extend and slide, thereby driving the corresponding gear 36 to rotate, and then driving the arc-shaped clamping strip 35 to open outward, and then the sleeve 2 is inserted into the surface of the cable body 1 through the sliding hole 21, and the grip 24 is released. The elastic restoring force provided by the spring 32 squeezes the arc-shaped clamping piece 31 against the end surface of the cable body 1, and at the same time, the L-shaped rack 34 extends and slides in the opposite direction, thereby driving the corresponding gear 36 to rotate in the opposite direction, and then driving the arc-shaped clamping strip 35 to contract inward and clamp and fix it on the surface of the cable body 1;

[0029] Secondly, when it is necessary to lay the cable, hold the handle 24 again so that the arc-shaped clamping piece 31 no longer conflicts with the end of the cable body 1, and the arc-shaped clamping strip 35 no longer conflicts with the surface of the cable body 1. At this time, pull the end of the cable body 1 so that the cable body 1 passes through the sleeve 2 and is pulled out after rolling contact with the plurality of balls 22 in the slide hole 21. After the cable is cut off after use, loosen the handle 24 so that the arc-shaped clamping piece 31 is squeezed and conflicted with the end of the cable body 1, and the arc-shaped clamping strip 35 is clamped and fixed to the surface of the cable body 1, thereby completing the locking fixation between the end of the cable body 1 and the body, thereby preventing the cable end from loosening and causing the cable to fall off the cable reel.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fire-resistant power cable, comprising a cable body (1) and a sleeve (2) sleeved on the surface of the cable body (1), characterized in that: Also includes: The clamping and fixing assembly comprises an arc-shaped clamping piece (31) which is telescopically and slidably mounted on the inner wall of the sleeve (2) to clamp the cable body (1), and also comprises an arc-shaped clamping strip (35) which rotates synchronously with the arc-shaped clamping piece (31) and is rotatably mounted on the outer wall of the sleeve (2) to clamp the cable body (1).

2. A fire-resistant power cable according to claim 1, characterized in that: The cable body (1) comprises a fire-resistant outer sheath (11), the inner annular wall of the fire-resistant outer sheath (11) is wrapped with a wrapping tape (12), the inner annular wall of the wrapping tape (12) is wrapped with a fire-resistant inner sheath (13), a plurality of conductor assemblies (15) are arranged in the fire-resistant inner sheath (13), and a filling layer (14) is arranged between the conductor assemblies (15) and the fire-resistant inner sheath (13).

3. A fire-resistant power cable according to claim 2, characterized in that: The conductor assembly (15) comprises a conductor, a soft copper strip is sheathed on the surface of the conductor, and an insulating layer is sheathed on the surface of the soft copper strip.

4. A fire-resistant power cable according to claim 1, characterized in that: Slide holes (21) are formed through both ends of the sleeve (2), a plurality of rolling balls (22) are embedded in the inner wall of the slide hole (21), an arc-shaped hole (23) is formed on the outer wall of the sleeve (2) through the slide hole (21) to facilitate the rotation of the arc-shaped clamping strip (35), and a handle (24) is fixedly mounted on the top of the sleeve (2).

5. A fire-resistant power cable according to claim 4, characterized in that: A spring (32) is installed between the top of the arc-shaped clamping piece (31) and the inner wall of the sliding hole (21), and a lifting handle (33) is installed on the top of the arc-shaped clamping piece (31) and extends through the outer wall of the sleeve (2) and is opposite to the grip (24).

6. A fire-resistant power cable according to claim 1, characterized in that: An L-shaped rack (34) is installed at the bottom of the arc-shaped clamping piece (31), and a gear (36) meshingly connected with the corresponding L-shaped rack (34) is fixedly installed at one end of the arc-shaped clamping strip (35) extending into the sleeve (2).

Images