An aviation-grade high-reliability cable

Abstract

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

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to an aviation-grade high-reliability cable. Background Art

[0002] In the aerospace industry, cables, as core carriers for power transmission, signal control, and data communication, must maintain long-term stable operation under extreme operating conditions. The complex internal environment of aircraft requires cables to withstand not only high temperatures (e.g., temperatures in the engine compartment and near the braking system can reach over 300°C) but also mechanical stresses (such as equipment compression, vibration shock, and installation bending stress). Consequently, aviation cables are subject to higher reliability requirements, requiring them to possess properties such as high-temperature and compression resistance to reduce the risk of cable breakage and slow cable aging to ensure their current-carrying capacity.

[0003] However, most of the current aviation cables are innovated and designed in terms of materials, with high R&D costs and serious bottlenecks. It is difficult to further improve the cable's high temperature resistance, extrusion resistance and other properties in terms of materials. Summary of the Invention

[0004] In view of the defects in the prior art, the object of the present invention is to provide an aviation-grade high-reliability cable with good high temperature resistance and extrusion resistance.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solution: an aviation-grade high-reliability cable, including a cable core, and further comprising:

[0006] 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;

[0007] 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;

[0008] 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.

[0009] Furthermore, the plurality of annular limiting grooves and the plurality of air inlets are alternately arranged in sequence along the circumference of the cable core.

[0010] Furthermore, the air inlet is an annular structure, and the diameter of the air inlet gradually decreases from the outside to the inside.

[0011] Furthermore, multiple connecting ropes are provided between two adjacent thermally conductive silicone rubber columns, and 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, and the connecting ropes are in a relaxed state.

[0012] Furthermore, a plurality of spherical grooves extending outward are opened 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 arranged in the spherical groove, and the elastic ball is confined in the spherical groove. The elastic ball makes the thermal conductive silicone rubber column tightly adhere to the inner wall of the lower arc-shaped groove.

[0013] Furthermore, the plurality of connecting ropes are arranged in one-to-one correspondence with the plurality of air inlets.

[0014] Furthermore, 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.

[0015] Furthermore, 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.

[0016] The present invention provides an aviation-grade, high-reliability cable in which heat generated by the cable core is transferred to the insulation layer and thermally conductive silicone rubber columns. When air flows through the cable, it passes through the air inlet into the annular guide groove, where it comes into contact with the insulation layer and thermally conductive silicone rubber columns, removing heat from these layers before being discharged. This ensures excellent high-temperature resistance. Furthermore, the elasticity of the thermally conductive silicone rubber columns protects the cable core from compression, resulting in excellent compression resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0019] Figure 3It is a structural diagram of the cable core, insulation layer and outer sheath;

[0020] Figure 4 Schematic diagram of the three-dimensional structure of the thermal conductive silicone rubber column.

[0021] Figure numerals: 10-cable core, 20-insulating layer, 21-lower arc groove, 30-outer sheath, 31-annular guide groove, 32-upper arc groove, 33-annular limit groove, 34-air inlet, 35-arc surface, 36-spherical groove, 37-elastic ball, 40-thermal conductive silicone rubber column, 41-ventilation hole, 50-connecting rope, 51-positioning block. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0023] In this application, unless otherwise specified or limited, the terms "connect" and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0024] In the description of this application, it should be understood that the terms "longitudinal", "transverse", "horizontal", "top", "bottom", "up", "down", "inside" and "outside" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0025] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0026] like Figures 1-4 As shown, the present invention provides an aviation-grade high-reliability cable, comprising a cable core 10 , which belongs to the prior art and whose specific structure is not described in detail here. The cable also comprises an insulating layer 20 , an outer sheath 30 and a plurality of heat-conducting silicone rubber columns 40 .

[0027] The insulation layer 20 is extruded onto the outer circumference of the cable core 10. It is defined by a plurality of inwardly extending lower arcuate grooves 21, which are arranged at equal intervals along the circumference of the cable core 10. Specifically, the insulation layer 20 is made of polytetrafluoroethylene (PTFE), which has excellent thermal conductivity. During production, the insulation layer 20 is formed by extruding the PTFE onto the outer circumference of the cable core 10 using an extruder.

[0028] The outer sheath 30 is sleeved over the outer side of the insulating layer 20, with an annular guide groove 31 formed between the outer sheath 30 and the insulating layer 20. The inner circumference of the outer sheath 30 is provided with a plurality of outwardly extending upper arcuate grooves 32. The plurality of upper arcuate grooves 32 are arranged at equal intervals along the circumference of the cable core 10, and the plurality of upper arcuate grooves 32 are arranged one-to-one with the plurality of lower arcuate grooves 21. An annular limiting groove 33 is formed between the upper arcuate grooves 32 and the lower arcuate grooves 21. The outer circumference of the outer sheath 30 is provided with multiple groups of air inlet structures. The multiple 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. The multiple air inlets 34 are arranged at equal intervals along the axial direction of the outer sheath 30, and the air inlets 34 are connected to the annular guide groove 31.

[0029] The thermally conductive silicone rubber columns 40 are cylindrical and are positioned one-to-one within the annular retaining grooves 33. The columns 40 are confined within the annular retaining grooves 33, and their diameters are smaller than those of the annular retaining grooves 33. The thermally conductive silicone rubber columns 40 exhibit good compression resilience and flame retardancy. Generally speaking, they have a temperature resistance range of -50°C to 200°C and a thermal conductivity coefficient of 1-5 W / (m·K), demonstrating excellent high-temperature resistance and thermal conductivity.

[0030] This cable is designed for use with aviation equipment. On the one hand, aviation equipment encounters air currents during flight; on the other hand, aviation equipment vibrates during operation, which also creates air currents in the surrounding air. Therefore, this cable is often used in environments with air currents.

[0031] The cable core 10 will generate a lot of heat when working for a long time, and the generated heat will be transferred to the insulating layer 20 and the thermally conductive silicone rubber column 40. When there is airflow passing through, the airflow will pass through the air inlet 34 into the annular guide groove 31, and contact the outer surface of the insulating layer 20 and the outer surface of the thermally conductive silicone rubber column 40, taking away the heat of the insulating layer 20 and the thermally conductive silicone rubber column 40 and then discharging it to the outside, so that the cable has good high temperature resistance. And because the thermally conductive silicone rubber column 40 is elastic, when an external force acts on the cable, the thermally conductive silicone rubber column 40 can play a compressive protection role on the cable core 10. When the external force disappears, the thermally conductive silicone rubber column 40 can reset the cable, ensuring the roundness of the cable, so the cable also has good extrusion resistance.

[0032] It is worth mentioning that since the diameter of the heat-conducting silicone rubber column 40 is smaller than the diameter of the annular limiting groove 33, there is a gap between the heat-conducting silicone rubber column 40 and the inner wall of the annular limiting groove 33, so that the airflow can flow quickly, thereby better taking away the heat of the insulating layer 20 and the heat-conducting silicone rubber column 40.

[0033] It is worth mentioning that the working environment of the aviation equipment is usually very clean, so after the air inlet 34 is opened on the outer sheath 30, a large amount of dust will not enter the annular flow guide groove 31, which will not affect the normal use of the cable.

[0034] In an embodiment, the plurality of annular limiting grooves 33 and the plurality of air inlets 34 are alternately arranged along the circumference of the cable core 10 in sequence.

[0035] In this way, the plurality of annular limiting grooves 33 and the plurality of air inlets 34 can be uniformly arranged on the cable, and no matter which direction the airflow comes from, it can pass through the air inlet 34 into the annular flow guide groove 31 to take away the heat of the insulating layer 20 and the heat-conducting silicone rubber column 40. At the same time, the roundness of the cable is also better guaranteed.

[0036] In an embodiment, the air inlet 34 is annular in structure, and the caliber 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 airflow passes through the air inlet 34, the arc surface 35 changes the flow direction of the airflow, so that the airflow forms a rotating flow inside the annular flow guide groove 31, thereby increasing the turbulence degree of the airflow and further improving the heat dissipation efficiency.

[0037] In an embodiment, a plurality of connecting ropes 50 are arranged between two adjacent heat-conducting 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 in the annular flow guide groove 31, and both ends of each connecting rope 50 are fixedly connected with two adjacent heat-conducting silicone rubber columns 40.

[0038] Under normal conditions, the connecting rope 50 is in a relaxed state.

[0039] When a larger external force acts on the outer sheath 30, the heat-conducting silicone rubber column 40 directly subjected to the external force will be concave inward and move inward, at this time, the connecting ropes 50 on both sides of the heat-conducting silicone rubber column 40 will generate a pulling force on the surrounding heat-conducting silicone rubber columns 40, thereby pulling the surrounding heat-conducting silicone rubber columns 40 out of the corresponding annular limiting groove 33. The heat-conducting silicone rubber column 40 pulled out will enter the annular flow guide groove 31 and gather near the contact point between the external force and the outer sheath 30, thereby sharing the external force together, so this design can play a gathering protection role on the position of the cable core 10 subjected to the external force.

[0040] When the external force is greater, the thermal conductive silicone rubber column 40 directly affected by the external force will be concave and move inward, and more thermal conductive silicone rubber columns 40 will be pulled out around it. This design has a dispersing effect on the external force and further improves the protection of the cable core 10.

[0041] When the external force disappears, the staff can simply reset the thermally conductive silicone rubber column 40 to the corresponding annular limiting groove 33 .

[0042] In one embodiment, the inner wall of the upper arcuate groove 32 is formed with a plurality of outwardly extending spherical grooves 36, which are arranged at equal intervals along the axial direction of the outer sheath 30. Resilient balls 37 are disposed within the spherical grooves 36 and are confined therein. The elastic balls 37 can exert downward pressure on the thermally conductive silicone rubber columns 40, thereby causing the thermally conductive silicone rubber columns 40 to adhere tightly to the inner wall of the lower arcuate groove 21.

[0043] This design ensures that under normal conditions, the thermally conductive silicone rubber column 40 is always in contact with the inner wall of the lower arc-shaped groove 21, thereby better transferring heat from the insulating layer 20, increasing the heat dissipation area, and ensuring the roundness of the cable.

[0044] It's worth noting that because the spherical grooves 36 and elastic balls 37 are arranged at equal intervals along the axial direction of the outer sheath 30, the elastic balls 37 do not fill the gap between the thermally conductive silicone rubber column 40 and the inner wall of the annular retaining groove 33. A substantial gap still exists between the thermally conductive silicone rubber column 40 and the inner wall of the annular retaining groove 33. Therefore, the design of the spherical grooves 36 and elastic balls 37 does not affect the normal flow of air within the annular guide groove 31, nor does it affect the heat dissipation of this cable.

[0045] In one embodiment, the plurality of connecting ropes 50 are disposed in a one-to-one correspondence with the plurality of air inlets 34 .

[0046] When a thermally conductive silicone rubber column 40 is pulled out of the corresponding annular limiting groove 33 by external force, the staff can operate through the air inlet 34 to reset the thermally conductive silicone rubber column 40 to the corresponding annular limiting groove 33, which facilitates the staff's operation.

[0047] Since the thermally conductive silicone rubber column 40 will prop up the outer sheath 30 when it is located in the annular guide groove 31, the staff can determine whether the thermally conductive silicone rubber column 40 is accurately reset to the corresponding annular limit groove 33 by observing whether the outer sheath 30 is still propped up.

[0048] 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 is red.

[0049] In a normal state, the positioning block 51 is located in the middle of the air inlet 34 .

[0050] 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.

[0051] Designing the positioning block 51 to be red can further facilitate staff to observe and notice the position of the positioning block 51 .

[0052] 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.

[0053] 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.

[0054] In addition, the design of the ventilation holes also increases the flow rate of airflow, further improving the heat dissipation effect.

[0055] 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.

[0056] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An aviation-grade high-reliability cable, comprising 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; A plurality of heat-conducting silicone rubber columns, each of which is disposed in a one-to-one correspondence within the plurality of annular limiting grooves. The heat-conducting silicone rubber columns are confined within the annular limiting grooves, and the diameter of the heat-conducting silicone rubber columns is smaller than the diameter of the annular limiting grooves. The plurality of annular limiting grooves and the plurality of air inlets are alternately arranged in sequence along the circumference of the cable core; The air inlet is an annular structure, and the diameter of the air inlet gradually decreases from the outside to the inside; A plurality of connecting ropes are provided between two adjacent 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 guide groove, and both ends of the connecting ropes are fixedly connected to two adjacent heat-conducting silicone rubber columns, and the connecting ropes are in a relaxed state. 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.

2. The aviation-grade high-reliability cable according to claim 1, characterized in that: The plurality of connecting ropes are arranged in one-to-one correspondence with the plurality of air inlets.

3. The aviation-grade high-reliability cable according to claim 2, 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.

4. The aviation-grade high-reliability cable according to claim 1, 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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