Anti-cracking structure and low-smoke halogen-free cable

Abstract

The utility model discloses an anti-cracking structure and a low-smoke halogen-free cable, and relates to the technical field of cables. The cable protection device comprises an inner protection layer which is arranged on the outer side of a cable sheath, an air bag layer is arranged between the inner protection layer and the cable sheath, an outer protection layer is arranged on the outer side of the inner protection layer, and a plurality of arched reinforcing strips are arranged between the outer protection layer and the inner protection layer. And polyurethane rigid foam is filled between the outer protective layer and the inner protective layer. According to the low-smoke halogen-free cable, the mode that in the prior art, a sheath of the low-smoke halogen-free cable is usually directly exposed outside is abandoned, when the cable is subjected to external impact, impact force is buffered through the outer protection layer, the multiple reinforcing strips, the polyurethane rigid foam, the inner protection layer and the air bag layer, the impact resistance of the cable is improved, and the service life of the cable is prolonged. Therefore, the possibility of cracking of the cable sheath is reduced, the possibility of cable damage is reduced, the service life of the cable is guaranteed, and the cable has higher practicability.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to an anti-cracking structure and a low-smoke halogen-free cable. Background Art

[0002] Cable is an electric energy or signal transmission device, which is made of one or more mutually insulated conductors and an outer insulating protective layer. There are many types of cables. Low-smoke halogen-free cable refers to an environmentally friendly cable made of a rubber material that does not contain halogen, lead, cadmium, chromium, mercury and other environmental substances. It does not emit toxic smoke when burned. In the prior art, the sheath of low-smoke halogen-free cable is usually directly exposed to the outside. When the cable is subjected to external impact, the sheath is prone to cracking, causing damage to the cable and reducing the service life of the cable. Therefore, an anti-cracking structure and a low-smoke halogen-free cable are proposed. Utility Model Content

[0003] The purpose of this application is to solve the technical problem that the sheath is usually directly exposed to the outside. When the cable is subjected to external impact, the sheath is prone to cracking, causing damage to the cable and reducing the service life of the cable. This application provides an anti-crack structure and a low-smoke halogen-free cable.

[0004] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:

[0005] Crack-resistant structure, including:

[0006] An inner protective layer is arranged on the outside of the cable sheath, an airbag layer is arranged between the inner protective layer and the cable sheath, an outer protective layer is arranged on the outside of the inner protective layer, a plurality of reinforcing strips each having an arched structure are arranged between the outer protective layer and the inner protective layer, and polyurethane rigid foam is filled between the outer protective layer and the inner protective layer.

[0007] Furthermore, the airbag layer includes a plurality of airbag strips enclosed in an annular structure.

[0008] Furthermore, a buffer strip is provided between the reinforcement strip and the inner protective layer or the outer protective layer.

[0009] Furthermore, a glass fiber layer is provided on the outer surface of the outer protective layer.

[0010] A low-smoke halogen-free cable includes the above-mentioned anti-cracking structure and also includes an armor layer, a reinforcing plate with a cross-shaped structure is arranged on the inner side of the armor layer, a plurality of filling cavities are formed between the reinforcing plate and the armor layer, a cable core and a filling layer are arranged in the filling cavity, a sheath layer is arranged on the outer side of the armor layer, and an inner protective layer is arranged on the outer side of the sheath layer.

[0011] Furthermore, a heat-conducting layer is arranged between the sheath layer and the armor layer, and the armor layer is provided with heat-conducting strips whose number is the same as that of the filling layer and which correspond one to one, and one end of the heat-conducting strip extends into the filling layer and the other end is connected to the heat-conducting layer.

[0012] Furthermore, a heat conducting plate having an arc-shaped structure is provided at one end of the heat conducting strip.

[0013] Furthermore, a cavity is constructed in the heat-conducting layer, and the cavity is filled with thermal conductive silicone grease.

[0014] The beneficial effects of this application are as follows:

[0015] 1. This application abandons the conventional method of directly exposing the sheath of low-smoke halogen-free cables to the outside. When the cable is subjected to external impact, the outer protective layer, multiple reinforcement strips, polyurethane rigid foam, inner protective layer and airbag layer are used to buffer the impact force, thereby improving the impact resistance of the cable, reducing the possibility of cracking of the cable sheath, reducing the possibility of cable damage, and ensuring the service life of the cable, so it is more practical.

[0016] 2. The present application can improve the heat resistance of the cable, thereby reducing the possibility of cracking of the sheath due to prolonged heating, and further ensuring the service life of the cable.

[0017] 3. This application can reduce the impact of cold environment on the sheath layer and reduce the possibility of cracking of the sheath layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the structure of this application;

[0019] Figure 2 This application Figure 1 The enlarged view of point A in the middle;

[0020] Figure 3 This application Figure 1 The enlarged view of point B in the middle;

[0021] Figure 4 This application Figure 1 Enlarged view of point C in the middle.

[0022] Figure numerals: 1. inner protective layer; 2. airbag layer; 3. outer protective layer; 4. reinforcement strip; 5. polyurethane rigid foam; 6. buffer strip; 7. glass fiber layer; 8. armor layer; 9. reinforcement plate; 10. cable core; 11. filling layer; 12. sheath layer; 13. heat conductive layer; 14. heat conductive strip; 15. heat conductive plate; 16. thermal grease. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0024] like Figure 1-Figure 2 As shown, an anti-cracking structure proposed in one embodiment of the present application includes:

[0025] An inner protective layer 1 is arranged on the outside of the cable sheath, a first accommodating cavity is formed between the inner protective layer 1 and the cable sheath, an airbag layer 2 is arranged between the inner protective layer 1 and the cable sheath, the airbag layer 2 is fixed in the first accommodating cavity, an outer protective layer 3 is arranged on the outside of the inner protective layer 1, a plurality of reinforcing strips 4, all of which are arched, are arranged between the outer protective layer 3 and the inner protective layer 1, the arch can withstand greater force, thereby improving the overall impact resistance of the cable, a second accommodating cavity is formed between the outer protective layer 3 and the inner protective layer 1, and a plurality of reinforcing strips 4 are fixed in the second accommodating cavity The outer protective layer 3 and the inner protective layer 1 are distributed in a circular array. The outer protective layer 3 and the inner protective layer 1 are filled with polyurethane rigid foam 5. The polyurethane rigid foam 5 is a high molecular polymer made of isocyanate and polyether as main raw materials. Under the action of a variety of additives such as a foaming agent, a catalyst, and a flame retardant, it is mixed by special equipment and foamed on site by high-pressure spraying. After curing, the bond is strong, so that the outer protective layer 3, the reinforcement strip 4 and the inner protective layer 1 can form a relative whole, improve the connection strength between the outer protective layer 3, the reinforcement strip 4 and the inner protective layer 1, and thus improve the overall strength of the cable;

[0026] When the cable is subjected to external impact, the impact force is initially buffered by the outer protective layer 3, and then the impact force is buffered by multiple reinforcement strips 4 and polyurethane rigid foam 5. Then the impact force is buffered again by the inner protective layer 1, and finally the impact force is buffered by the airbag layer 2, so as to reduce the possibility of cracking of the cable sheath and the possibility of cable damage, thereby ensuring the service life of the cable;

[0027] In summary, the present application abandons the prior art method in which the sheath of the low-smoke halogen-free cable is usually directly exposed to the outside. When the cable is subjected to external impact, the outer protective layer 3, multiple reinforcement strips 4, polyurethane rigid foam 5, inner protective layer 1 and airbag layer 2 are used together to buffer the impact force, thereby improving the impact resistance of the cable, reducing the possibility of cracking of the cable sheath, reducing the possibility of cable damage, and ensuring the service life of the cable, and therefore it is more practical.

[0028] like Figure 2 As shown, in some embodiments, the airbag layer 2 includes a plurality of airbag strips enclosed in an annular structure;

[0029] Referring to the above, during use, if a local airbag strip leaks, it will not cause much impact on the entire airbag layer 2, thereby improving the stability of use and further ensuring the service life of the cable.

[0030] like Figure 2 As shown, in some embodiments, a buffer strip 6 is provided between the reinforcing strip 4 and the inner protective layer 1 or the outer protective layer 3, and the shape of the buffer strip 6 corresponds to the shape of the reinforcing strip 4;

[0031] With reference to the above, when in use, the buffer strip 6 is provided to improve the effect of buffering the impact force, thereby further improving the impact resistance of the cable.

[0032] like Figure 2 As shown, in some embodiments, the outer surface of the outer protective layer 3 is provided with a glass fiber layer 7. Glass fiber is an inorganic non-metallic material with excellent performance, good insulation, strong heat resistance, high corrosion resistance, high mechanical strength, and can effectively cope with external temperature changes and heat insulation;

[0033] Referring to the above, in actual use, heat is also one of the reasons for the cracking of the cable sheath, that is, the cable sheath is prone to cracking when exposed to heat for a long time in summer. In this embodiment, by providing the glass fiber layer 7, the heat resistance of the cable can be improved, thereby reducing the possibility of cracking of the sheath due to long-term heat, and further ensuring the service life of the cable.

[0034] like Figure 2-Figure 4 As shown, the present application also proposes a low-smoke halogen-free cable, including the above-mentioned anti-cracking structure, and also includes an armor layer 8, a reinforcing plate 9 with a cross-shaped structure is arranged on the inner side of the armor layer 8, the reinforcing plate 9 is fixedly arranged on the inner side of the armor layer 8, and a plurality of filling cavities are formed between the reinforcing plate 9 and the armor layer 8, and the plurality of filling cavities are distributed in a ring array, and a cable core 10 and a filling layer 11 are arranged in the filling cavity, a sheath layer 12 is arranged on the outer side of the armor layer 8, and an inner protective layer 1 is arranged on the outer side of the sheath layer 12;

[0035] With reference to the above, when in use, the overall strength of the cable can be improved by providing the reinforcing plate 9, thereby further improving the impact resistance of the cable.

[0036] like Figure 4 As shown, in some embodiments, a heat-conducting layer 13 is provided between the sheath layer 12 and the armor layer 8, a receiving cavity is formed between the sheath layer 12 and the armor layer 8, the heat-conducting layer 13 is fixedly arranged in the receiving cavity, the armor layer 8 is provided with heat-conducting strips 14 of the same number and one-to-one correspondence as the filling layer 11, the armor layer 8 is configured with perforations of the same number and one-to-one correspondence as the heat-conducting strips 14, the heat-conducting strips 14 are fixedly arranged in the perforations, one end of the heat-conducting strips 14 extends into the filling layer 11, and the other end is connected to the heat-conducting layer 13;

[0037] Referring to the above, in actual use, cold is also one of the reasons for the cracking of the cable sheath, that is, the cable sheath is easy to harden and become brittle in a cold environment, thereby cracking. In the present embodiment, when the cable core 10 is operating, that is, when transmitting current or information, heat will be generated, and the heat will be transferred to the filling layer 11. Then, the heat of the filling layer 11 is transferred to the heat conductive layer 13 through the heat conductive strip 14, and then the heat is transferred to the sheath layer 12 by the heat conductive layer 13, thereby reducing the impact of the cold environment on the sheath layer 12 and reducing the possibility of cracking of the sheath layer 12.

[0038] like Figure 4 As shown, in some embodiments, a heat conducting plate 15 having an arc-shaped structure is provided at one end of the heat conducting strip 14, and the heat conducting plate 15 is fixedly connected to the heat conducting strip 14 and is located in the filling layer 11;

[0039] Referring to the above, when the heat of the filling layer 11 is conducted to the heat conducting layer 13 through the heat conducting strips 14 , the heat conducting effect and efficiency can be improved by disposing the heat conducting plates 15 .

[0040] like Figure 4 As shown, in some embodiments, a cavity is constructed in the heat-conducting layer 13, and the cavity is filled with thermal grease 16. The thermal grease 16 is a thermally conductive organic silicone grease-like composite made of organic silicone as the main raw material and adding heat-resistant and thermally conductive materials. It is a high thermal conductive insulating organic silicone material with excellent thermal conductivity;

[0041] As mentioned above, during the heat conduction process, the heat conduction effect and efficiency can be further improved through the cooperation of the cavity and the thermal grease 16 .

[0042] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Anti-crack structure, characterized in that: include: An inner protective layer (1) is arranged on the outside of a cable sheath, an airbag layer (2) is arranged between the inner protective layer (1) and the cable sheath, an outer protective layer (3) is arranged on the outside of the inner protective layer (1), a plurality of reinforcing strips (4) each having an arched structure are arranged between the outer protective layer (3) and the inner protective layer (1), and polyurethane rigid foam (5) is filled between the outer protective layer (3) and the inner protective layer (1).

2. The anti-cracking structure according to claim 1, characterized in that: The airbag layer (2) comprises a plurality of airbag strips which are enclosed in an annular structure.

3. The anti-cracking structure according to claim 1, characterized in that: A buffer strip (6) is provided between the reinforcement strip (4) and the inner protective layer (1) or the outer protective layer (3).

4. The anti-cracking structure according to claim 1, characterized in that: The outer surface of the outer protective layer (3) is provided with a glass fiber layer (7).

5. A low-smoke halogen-free cable, comprising the anti-cracking structure according to any one of claims 1 to 4, characterized in that: The invention also comprises an armor layer (8), wherein a reinforcing plate (9) having a cross-shaped structure is arranged on the inner side of the armor layer (8), a plurality of filling cavities are formed between the reinforcing plate (9) and the armor layer (8), a cable core (10) and a filling layer (11) are arranged in the filling cavities, a sheath layer (12) is arranged on the outer side of the armor layer (8), and the inner protective layer (1) is arranged on the outer side of the sheath layer (12).

6. The low-smoke halogen-free cable according to claim 5, characterized in that: A heat-conducting layer (13) is provided between the sheath layer (12) and the armor layer (8), and the armor layer (8) is provided with heat-conducting strips (14) the same in number as the filling layer (11) and corresponding to each other in one to one, one end of the heat-conducting strip (14) extending into the filling layer (11) and the other end connected to the heat-conducting layer (13).

7. The low-smoke zero-halogen cable according to claim 6, characterized in that: A heat conducting plate (15) having an arc-shaped structure is provided at one end of the heat conducting strip (14).

8. The low-smoke halogen-free cable according to claim 6, characterized in that: A cavity is constructed in the heat-conducting layer (13), and the cavity is filled with heat-conducting silicone grease (16).

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