Aircraft-grade high-reliability cable

Abstract

The invention relates to the technical field of cables, and provides an aviation-grade high-reliability cable, which comprises a cable core and further comprises an insulating layer, the insulating layer is extruded on the peripheral surface of the cable core, and a plurality of lower arc-shaped grooves are formed in the peripheral surface of the insulating layer; the outer sheath sleeves the outer side of the insulating layer, an annular diversion trench is formed between the outer sheath and the insulating layer, a plurality of upper arc-shaped grooves are formed in the inner circumferential surface of the outer sheath, annular limiting grooves are formed between the upper arc-shaped grooves and the lower arc-shaped grooves, a plurality of groups of air inlet structures are formed on the outer circumferential surface of the outer sheath, each group of air inlet structures comprises a plurality of air inlets, and the air inlets are communicated with the annular diversion trench. The air inlet is communicated with the annular flow guide groove; the plurality of heat-conducting silicone rubber columns are respectively arranged in the plurality of annular limiting grooves in a one-to-one correspondence manner, the heat-conducting silicone rubber columns are limited in the annular limiting grooves, and the diameter of the heat-conducting silicone rubber columns is smaller than that of the annular limiting grooves. The aviation-grade high-reliability cable provided by the invention has good high temperature resistance and extrusion resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and particularly to an aviation-grade highly reliable cable. Background Art

[0002] In the aerospace field, as the core carrier for power transmission, signal control, and data communication, cables need to maintain long-term stable operation under extreme working conditions. The internal environment of aircraft is complex. Cables not only face high temperatures (e.g., the temperature near the engine compartment and braking system can reach over 300 °C), but also need to withstand mechanical pressures (such as equipment extrusion, vibration shock, installation bending stress, etc.). Therefore, higher requirements are imposed on the reliability of aviation cables. The cables need to have properties such as high temperature resistance and extrusion resistance, so as to reduce the risk of cable core breakage and delay cable aging to ensure the current-carrying capacity of the cables.

[0003] However, most current aviation cables mainly innovate and design in terms of materials, with high R & D costs. And there are currently serious bottlenecks, making it difficult to further improve the properties such as high temperature resistance and extrusion resistance of cables in terms of materials. Summary of the Invention

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide an aviation-grade highly reliable cable with good high temperature resistance and extrusion resistance.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions: An aviation-grade highly reliable cable includes a cable core, and further includes: An insulating layer, the insulating layer is extruded on the outer peripheral surface of the cable core, and a plurality of inwardly extending lower arc-shaped grooves are formed on the outer peripheral surface of the insulating layer. The plurality of lower arc-shaped grooves are arranged at equal intervals along the circumferential direction of the cable core; An outer sheath, the outer sheath is sleeved on the outside of the insulating layer. An annular flow guiding groove is formed between the outer sheath and the insulating layer. A plurality of outwardly extending upper arc-shaped grooves are formed on the inner peripheral surface of the outer sheath. The plurality of upper arc-shaped grooves are arranged in one-to-one correspondence with the plurality of lower arc-shaped grooves. An annular limiting groove is formed between the upper arc-shaped groove and the lower arc-shaped groove. A plurality of groups of air inlet structures are formed on the outer peripheral surface of the outer sheath. The plurality of groups of air inlet structures are arranged at equal intervals along the axial direction of the outer sheath. Each group of air inlet structures includes a plurality of air inlets. The plurality of air inlets are arranged at equal intervals along the axial direction of the outer sheath. The air inlets are communicated with the annular flow guiding groove; A plurality of heat-conducting silicone rubber columns, the plurality of heat-conducting silicone rubber columns are respectively arranged in the plurality of annular limiting grooves in one-to-one correspondence. The heat-conducting silicone rubber columns are restricted in the annular limiting grooves. The diameter of the heat-conducting silicone rubber columns is smaller than the diameter of the annular limiting grooves.

[0006] Further, the plurality of annular limiting grooves and the plurality of air inlets are arranged alternately in sequence along the circumferential direction of the cable core.

[0007] Further, the air inlet is of an annular structure, and the diameter of the air inlet gradually decreases from outside to inside.

[0008] Further, a plurality of connecting ropes are arranged between adjacent two heat-conducting silicone rubber columns, the plurality of connecting ropes are arranged at equal intervals along the axial direction of the cable core, the connecting ropes are located in the annular diversion groove and are fixedly connected to two adjacent heat-conducting silicone rubber columns at both ends respectively, and the connecting ropes are in a slack state.

[0009] Further, a plurality of spherical grooves extending outwards are formed on the inner wall of the upper arc-shaped groove, the plurality of spherical grooves are arranged at intervals in sequence along the axial direction of the outer sheath, elastic balls are arranged in the spherical grooves, the elastic balls are restricted in the spherical grooves, and the elastic balls make the heat-conducting silicone rubber columns closely attached to the inner wall of the lower arc-shaped groove.

[0010] Further, the plurality of connecting ropes and the plurality of air inlets are arranged in one-to-one correspondence.

[0011] Further, a positioning block is fixedly installed in the middle of the connecting rope, the positioning block is located in the middle of the air inlet, and the positioning block is red.

[0012] Further, multiple groups of ventilation structures are formed on the heat-conducting silicone rubber column, the multiple groups of ventilation structures are arranged at equal intervals along the circumferential direction of the heat-conducting silicone rubber column, each group of ventilation structures includes a plurality of ventilation holes, and the ventilation holes penetrate through the heat-conducting silicone rubber column along the radial direction of the heat-conducting silicone rubber column.

[0013] Advantages of the present invention: For an aviation-grade highly reliable cable provided by the present invention, the heat generated by the cable core is transferred to the insulating layer and the heat-conducting silicone rubber columns. When there is an air flow passing by, the air flow will pass through the air inlets and enter into the annular diversion groove to contact with the insulating layer and the heat-conducting silicone rubber columns, take away the heat of the insulating layer and the heat-conducting silicone rubber columns and then discharge outwards, so that the cable has good high-temperature resistance. And because the heat-conducting silicone rubber columns have elasticity and play a role in compressive protection for the cable core, the cable also has good extrusion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 an enlarged schematic structural diagram of part A in Figure 3 is a schematic structural diagram of the cable core, the insulating layer and the outer sheath; Figure 4Schematic three-dimensional structure diagram of the thermally conductive silicone rubber column.

[0015] Reference numerals: 10 - cable core, 20 - insulating layer, 21 - lower arc-shaped groove, 30 - outer sheath, 31 - annular diversion groove, 32 - upper arc-shaped groove, 33 - annular limiting groove, 34 - air inlet, 35 - arc surface, 36 - spherical groove, 37 - elastic ball, 40 - thermally conductive silicone rubber column, 41 - ventilation hole, 50 - connecting rope, 51 - positioning block. Detailed implementation manners

[0016] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0017] In this application, unless otherwise clearly specified and limited, the terms "connection" and "fixation" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0018] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "horizontal", "top", "bottom", "upper", "lower", "inner" and "outer" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0019] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, "a plurality" means more than two, unless otherwise clearly specifically limited.

[0020] As Figures 1 - 4 shown, the present invention provides an aviation-grade highly reliable cable, including a cable core 10. The cable core 10 belongs to the prior art, and its specific structure will not be elaborated here. This cable also includes an insulating layer 20, an outer sheath 30, and multiple thermally conductive silicone rubber columns 40.

[0021] The insulating layer 20 is extruded around the outer circumferential surface of the cable core 10. A plurality of inwardly extending lower arc-shaped grooves 21 are formed on the outer circumferential surface of the insulating layer 20, and the plurality of lower arc-shaped grooves 21 are arranged at equal intervals in sequence along the circumferential direction of the cable core 10. Specifically, the material of the insulating layer 20 is polytetrafluoroethylene, and polytetrafluoroethylene has good heat conduction performance. During production, the polytetrafluoroethylene can be extruded around the outer circumferential surface of the cable core 10 through an extruder to form the insulating layer 20.

[0022] The outer sheath 30 is sleeved outside the insulating layer 20, and an annular diversion groove 31 is formed between the outer sheath 30 and the insulating layer 20. A plurality of outwardly extending upper arc-shaped grooves 32 are formed on the inner circumferential surface of the outer sheath 30, and the plurality of upper arc-shaped grooves 32 are arranged at equal intervals in sequence along the circumferential direction of the cable core 10. The plurality of upper arc-shaped grooves 32 are arranged in one-to-one correspondence with the plurality of lower arc-shaped grooves 21. An annular limiting groove 33 is formed between the upper arc-shaped groove 32 and the lower arc-shaped groove 21. A plurality of groups of air inlet structures are formed on the outer circumferential surface of the outer sheath 30, and the plurality of groups of air inlet structures are arranged at equal intervals along the axial direction of the outer sheath 30. Each group of air inlet structures includes a plurality of air inlets 34, and the plurality of air inlets 34 are arranged at equal intervals along the axial direction of the outer sheath 30. The air inlets 34 communicate with the annular diversion groove 31.

[0023] The heat-conducting silicone rubber column 40 is cylindrical, and a plurality of heat-conducting silicone rubber columns 40 are respectively arranged in a plurality of annular limiting grooves 33 in one-to-one correspondence. The heat-conducting silicone rubber column 40 is restricted in the annular limiting groove 33, and the diameter of the heat-conducting silicone rubber column 40 is smaller than the diameter of the annular limiting groove 33. The heat-conducting silicone rubber column 40 has good compression resilience and flame retardancy. Generally speaking, its temperature resistance range is -50 to 200 °C, and its thermal conductivity is 1-5 W / (m·K), having good high-temperature resistance and heat conduction performance.

[0024] This cable is used in combination with aviation equipment. On the one hand, the aviation equipment will encounter airflows during flight; on the other hand, the aviation equipment will generate vibrations during operation, and the vibrations will also form airflows in the surrounding air. Therefore, this cable is often in a working environment with airflows.

[0025] The cable core 10 will generate more heat during long-term operation, and the generated heat will be transferred to the insulating layer 20 and the heat-conducting silicone rubber column 40. When there is an airflow passing by, the airflow will pass through the air inlets 34 and enter the annular diversion groove 31, and contact the outer surface of the insulating layer 20 and the outer surface of the heat-conducting silicone rubber column 40, take away the heat of the insulating layer 20 and the heat-conducting silicone rubber column 40 and then discharge it outward. Therefore, this cable has good high-temperature resistance. And because the heat-conducting silicone rubber column 40 has elasticity, when an external force acts on this cable, the heat-conducting silicone rubber column 40 can play a role in compressive protection for the cable core 10. When the external force disappears, the heat-conducting silicone rubber column 40 can also reset this cable, ensuring the roundness of this cable. Therefore, this cable also has good extrusion resistance.

[0026] It should be noted that since the diameter of the thermally conductive silicone rubber column 40 is smaller than that of the annular limiting groove 33, there is a gap between the thermally conductive silicone rubber column 40 and the inner wall of the annular limiting groove 33, which facilitates the rapid flow of air, thereby better carrying away the heat of the insulating layer 20 and the thermally conductive silicone rubber column 40.

[0027] It should be noted that the working environment of aviation equipment is usually very clean. Therefore, after the air inlet 34 is opened on the outer sheath 30, a large amount of dust will not enter the annular diversion groove 31, and the normal use of this cable will not be affected.

[0028] In one embodiment, the plurality of annular limiting grooves 33 and the plurality of air inlets 34 are alternately arranged in sequence along the circumferential direction of the cable core 10.

[0029] In this way, the plurality of annular limiting grooves 33 and the plurality of air inlets 34 can be evenly arranged on this cable. No matter from which direction the air flow passes, it can pass through the air inlet 34 and enter the annular diversion groove 31 to carry away the heat of the insulating layer 20 and the thermally conductive silicone rubber column 40. At the same time, the roundness of this cable is better guaranteed.

[0030] In one embodiment, the air inlet 34 is of an annular structure, and the diameter of the air inlet 34 gradually decreases from outside to inside. This design makes the inner wall of the air inlet 34 an arc surface 35. When the air flow passes through the air inlet 34, the arc surface 35 will change the flow direction of the air flow, so that the air flow forms a rotational flow inside the annular diversion groove 31, thereby increasing the turbulence degree of the air flow and further improving the heat dissipation efficiency.

[0031] In one embodiment, a plurality of connecting ropes 50 are arranged between two adjacent thermally conductive silicone rubber columns 40. The plurality of connecting ropes 50 are arranged at equal intervals along the axial direction of the cable core 10. The connecting ropes 50 are located inside the annular diversion groove 31 and are fixedly connected to two adjacent thermally conductive silicone rubber columns 40 at both ends respectively.

[0032] Under normal conditions, the connecting ropes 50 are in a relaxed state.

[0033] When a relatively large external force acts on the outer sheath 30, the thermally conductive silicone rubber column 40 directly affected by the external force will sink inward and move inward. At this time, the connecting ropes 50 on both sides of it will exert a pulling force on the surrounding thermally conductive silicone rubber columns 40, and then pull the surrounding thermally conductive silicone rubber columns 40 out of the corresponding annular limiting grooves 33. The pulled-out thermally conductive silicone rubber columns 40 will enter the annular diversion groove 31 and gather near the contact point between the external force and the outer sheath 30, so as to share the external force together. Therefore, this design can play a role in concentrating and protecting the position of the cable core 10 where the external force is applied.

[0034] When the external force is greater, the heat-conducting silicone rubber column 40 directly affected by the external force will sink inward and move inward more, and more heat-conducting silicone rubber columns 40 will be pulled out around it. This design disperses the external force and further improves the protection of the cable core 10.

[0035] When the external force disappears, the staff can reset the heat-conducting silicone rubber column 40 into the corresponding annular limiting groove 33.

[0036] In one embodiment, a plurality of spherical grooves 36 extending outward are formed on the inner wall of the upper arc groove 32, and the plurality of spherical grooves 36 are arranged at equal intervals in sequence along the axial direction of the outer sheath 30. An elastic ball 37 is arranged in the spherical groove 36. The elastic ball 37 is restricted in the spherical groove 36, and the elastic ball 37 can exert a downward pressure on the heat-conducting silicone rubber column 40, so that the heat-conducting silicone rubber column 40 closely adheres to the inner wall of the lower arc groove 21.

[0037] This design enables the heat-conducting silicone rubber column 40 to always be in contact with the inner wall of the lower arc groove 21 under normal conditions, so as to better transfer the heat on the insulating layer 20, increase the heat dissipation area, and also ensure the roundness of the cable.

[0038] It should be noted that since the spherical grooves 36 and the elastic balls 37 are arranged at equal intervals in sequence along the axial direction of the outer sheath 30, the elastic balls 37 do not fill the gap between the heat-conducting silicone rubber column 40 and the inner wall of the annular limiting groove 33. There are still a large number of gaps between the heat-conducting silicone rubber column 40 and the inner wall of the annular limiting groove 33. Therefore, the design of the spherical grooves 36 and the elastic balls 37 does not affect the normal flow of the air flow in the annular diversion groove 31 and does not affect the heat dissipation of the cable.

[0039] In one embodiment, a plurality of connecting ropes 50 are arranged in one-to-one correspondence with a plurality of air inlets 34.

[0040] When a heat-conducting silicone rubber column 40 is pulled out of the corresponding annular limiting groove 33 by an external force, the staff can operate through the air inlet 34 to reset the heat-conducting silicone rubber column 40 into the corresponding annular limiting groove 33, which facilitates the operation of the staff.

[0041] Since the heat-conducting silicone rubber column 40 will support the outer sheath 30 when it is located in the annular diversion groove 31, the staff can judge whether the heat-conducting silicone rubber column 40 is accurately reset into the corresponding annular limiting groove 33 by observing whether the outer sheath 30 is still supported.

[0042] In one embodiment, a positioning block 51 is fixedly installed in the middle of the connecting rope 50. The positioning block 51 is located in the middle of the air inlet 34, and the positioning block 51 is red.

[0043] Under normal conditions, the positioning block 51 is located in the middle of the air inlet 34.

[0044] Therefore, when resetting the thermal silicone rubber column 40, the staff can determine whether the thermal silicone rubber column 40 is accurately reset to the corresponding annular limit groove 33 by observing whether the positioning block 51 is reset to the middle of the air inlet 34, which further facilitates the staff's operation.

[0045] Designing the positioning block 51 to be red can further facilitate staff to observe and notice the position of the positioning block 51 .

[0046] In one embodiment, the thermally conductive silicone rubber column 40 is formed with multiple sets of ventilation structures, which are evenly spaced along the circumference of the thermally conductive silicone rubber column 40. Each set of ventilation structures includes multiple ventilation holes 41, which extend radially through the entire thermally conductive silicone rubber column 40.

[0047] As the airflow, removing heat from the insulation layer 20, rotates within the annular guide groove 31, a portion of the airflow flows through the outer circumference of the thermally conductive silicone rubber column 40, removing heat from the column 40; another portion of the airflow flows through the inner wall of the ventilation hole 41, also removing heat from the column 40. These two airflows work together, one inside and one outside, to remove heat from the column 40, further improving the heat dissipation efficiency of the cable.

[0048] In addition, the design of the ventilation holes also increases the flow rate of airflow, further improving the heat dissipation effect.

[0049] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as illustrative and non-restrictive in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and all changes that come within the meaning and range of equivalents of the claims are intended to be included therein.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An aviation-grade highly reliable cable, including a cable core, characterized in that: Also includes: An insulating layer, wherein the insulating layer is extruded on the outer circumference of the cable core, and a plurality of lower arc-shaped grooves extending inward are formed on the outer circumference of the insulating layer, wherein the plurality of lower arc-shaped grooves are arranged at equal intervals along the circumference of the cable core; An outer sheath, wherein the outer sheath is sleeved on the outside of the insulating layer, an annular guide groove is formed between the outer sheath and the insulating layer, a plurality of upper arc-shaped grooves extending outward are opened on the inner circumference of the outer sheath, the plurality of upper arc-shaped grooves are arranged in a one-to-one correspondence with the plurality of lower arc-shaped grooves, an annular limit groove is formed between the upper arc-shaped grooves and the lower arc-shaped grooves, a plurality of groups of air inlet structures are formed on the outer circumference of the outer sheath, the plurality of groups of air inlet structures are arranged at equal intervals along the axial direction of the outer sheath, each group of the air inlet structures includes a plurality of air inlets, the plurality of air inlets are arranged at equal intervals along the axial direction of the outer sheath, and the air inlets are connected to the annular guide groove; Multiple thermally conductive silicone rubber columns are respectively arranged in the multiple annular limiting grooves in a one-to-one correspondence. The thermally conductive silicone rubber columns are confined in the annular limiting grooves, and the diameter of the thermally conductive silicone rubber columns is smaller than the diameter of the annular limiting grooves.

2. The aviation-grade highly reliable cable according to claim 1, wherein: The plurality of annular limiting grooves and the plurality of air inlets are alternately arranged in sequence along the circumference of the cable core.

3. The aviation-grade highly reliable cable according to claim 2, wherein: The air inlet is an annular structure, and the diameter of the air inlet gradually decreases from the outside to the inside.

4. The aviation-grade highly reliable cable according to claim 2, wherein: Multiple connecting ropes are arranged between two adjacent thermally conductive silicone rubber columns. The multiple connecting ropes are arranged at equal intervals along the axial direction of the cable core. The connecting ropes are located in the annular guide groove, and the two ends are fixedly connected to the two adjacent thermally conductive silicone rubber columns respectively. The connecting ropes are in a relaxed state.

5. The high-reliability cable of aviation grade according to claim 1, wherein: A plurality of spherical grooves extending outward are provided on the inner wall of the upper arc-shaped groove, and the plurality of spherical grooves are arranged in sequence and spaced apart along the axial direction of the outer sheath. An elastic ball is provided in the spherical groove, and the elastic ball is confined in the spherical groove. The elastic ball makes the thermally conductive silicone rubber column tightly adhere to the inner wall of the lower arc-shaped groove.

6. The an aviation-grade highly reliable cable according to claim 4, wherein: The plurality of connecting ropes are arranged in one-to-one correspondence with the plurality of air inlets.

7. The aviation-grade highly reliable cable according to claim 6, characterized in that: A positioning block is fixedly installed in the middle of the connecting rope, and the positioning block is located in the middle of the air inlet. The positioning block is red.

8. The aviation-grade highly reliable cable according to claim 4, characterized in that: Multiple groups of ventilation structures are formed on the thermally conductive silicone rubber column, and the multiple groups of ventilation structures are arranged at equal intervals along the circumference of the thermally conductive silicone rubber column. Each group of ventilation structures includes multiple ventilation holes, and the ventilation holes penetrate the thermally conductive silicone rubber column along the radial direction of the thermally conductive silicone rubber column.

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