CN112712919B - Shielded wire harness and method for producing shielded wire harness - Google Patents
Shielded wire harness and method for producing shielded wire harness Download PDFInfo
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- CN112712919B CN112712919B CN202011520104.7A CN202011520104A CN112712919B CN 112712919 B CN112712919 B CN 112712919B CN 202011520104 A CN202011520104 A CN 202011520104A CN 112712919 B CN112712919 B CN 112712919B
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- ICXAPFWGVRTEKV-UHFFFAOYSA-N 2-[4-(1,3-benzoxazol-2-yl)phenyl]-1,3-benzoxazole Chemical compound C1=CC=C2OC(C3=CC=C(C=C3)C=3OC4=CC=CC=C4N=3)=NC2=C1 ICXAPFWGVRTEKV-UHFFFAOYSA-N 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/009—Cables with built-in connecting points or with predetermined areas for making deviations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Insulated Conductors (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The present invention relates to a shielded wire harness including: the cable comprises a core wire, a first shielding layer, a second shielding layer, a protective sleeve and a rubber protective layer. Wherein the core wire comprises: a first branched core and a second branched core, the first branched core meeting the second branched core at a first intersection, and constituting a third branched core. The first shielding layer provides a first layer of electromagnetic shielding protection, and the second shielding layer provides the second layer of electromagnetic shielding protection. The first shielding layer is made of a metal foil material, the second shielding layer is made of a metalized aramid fiber material, the two materials are lighter in weight, and the effect of protecting electromagnetic shielding is more excellent. The protective sleeve is used for protecting the first shielding layer and the second shielding layer, and the rubber protective layer protects the first junction. Further, a method for manufacturing a shielded wire harness is provided.
Description
Technical Field
The invention relates to the technical field of aerospace cables, in particular to a shielding wire harness and a preparation method of the shielding wire harness.
Background
In the aircraft equipment, because the electronic equipment is dense, the electromagnetic environment of the equipment in the aircraft is complex, and if the wiring harness connected with the electronic equipment is not electromagnetically protected, the electromagnetic waves radiated by the electronic equipment can influence the efficiency of the wiring harness for transmitting data. Meanwhile, in the signal transmission process, especially when high-power and high-frequency signals are transmitted, a large amount of electromagnetic waves are radiated by the wire harness, and the normal operation of other electronic equipment is further influenced.
In order to avoid such a situation, it is necessary to design a shielding layer against electromagnetic waves on the wire harness. At present, the shielding design of the aircraft wire harness mainly adopts an anti-wave sleeve technology, namely, metal (usually tin-plated copper braided wires) anti-wave sleeves are sleeved on the trunk and the branches of the wire harness, so as to achieve the purposes of resisting external electromagnetic interference and preventing internal transmission signals from radiating and interfering to the outside.
However, in the prior art, because the metal wave-proof sleeve adopts an external penetration mode, firstly, the coverage rate of the shielding layer is not high, and particularly, the metal wave-proof sleeve is difficult to cover at the junction of the branch lines; secondly, the metal wave-proof sleeve material is usually a tinned copper braided wire, which increases the mass of the shielding wire harness and is not beneficial to the requirement of the airplane in weight reduction.
Disclosure of Invention
In view of the above, it is necessary to provide a shielding wire harness with full coverage and lighter weight to solve the problems of low coverage and heavy weight of the shielding layer of the wire harness in the prior art, and further to provide a method for preparing the shielding wire harness.
A shielded wire harness, comprising:
a core wire, the core wire comprising: a first branched core and a second branched core, the first branched core and the second branched core meeting at a first intersection and constituting a third branched core;
the first shielding layer is respectively wound on the outer surfaces of the first branch core wire, the second branch core wire and the third branch core wire, and the first shielding layer is made of metal foil;
the second shielding layer is woven on the outer surface of the first shielding layer, the second shielding layer is respectively woven on the first branch core wire, the second branch core wire and the third branch core wire, and the second shielding layer is made of metalized aramid fibers;
the protective sleeve covers the second shielding layer;
the rubber protective layer is coated on the first intersection and partially coated on the protective sleeve.
Above-mentioned shielding pencil, through first shielding layer with the second shielding layer can with the heart yearn is whole to be covered, wherein first shielding layer adopts the metal foil material, the second shielding layer adopts the metallization aramid fiber, and the both all can be coated with covering completely betterly first branch heart yearn second branch heart yearn with on the third branch heart yearn, and then can avoid the electromagnetic wave right the interference of heart yearn. The protective sleeve is coated on the second shielding layer, so that on one hand, the protective sleeve can better protect the first shielding layer and the second shielding layer, and the influence of environmental factors, such as impact, scraping, rain, corrosion and the like, on the protective sleeve when the protective sleeve is exposed outside is avoided. The rubber protective layer is installed at the first junction, so that the branching portion of the wire harness can be well protected. Meanwhile, the rubber protective layer is partially coated on the protective sleeve, so that the wire harness can be further sealed, and the wire harness can be better protected against erosion of water vapor and the like. In addition, in the aspect of shielding materials, the first shielding layer is made of metal foil, the second shielding layer is made of metalized aramid, and compared with the traditional tinned copper braided wire, the two materials are lighter in weight and better meet the requirement of an airplane on weight reduction.
In one embodiment, the protective sleeve comprises: the first protection sleeve covers the second shielding layer on the first branch core wire; the second protection sleeve is coated on the second shielding layer of the second branch core wire; and the third protection sheath is coated on the second shielding layer of the third branch core wire.
Because the protection cover can avoid the first shielding layer and the second shielding layer to be exposed outside, the first shielding layer and the second shielding layer inside can be protected from the influence of external environments such as moisture, corrosion and the like.
In one embodiment, the protective sleeve is heat shrink tubing. The heat shrinkable tube has better effects of corrosion resistance and the like.
In one embodiment, the metal foil can also be a composite film of aluminum or copper and a polyimide film.
When the metal foil is a composite film of aluminum or copper and a polyimide film, on one hand, the electromagnetic wave resistance can be improved, and meanwhile, the composite film also has other good physical properties.
In one embodiment, the material of the second shielding layer can also be metallized poly-p-phenylene benzobisoxazole fiber, metallized polyarylate fiber or carbon fiber.
The metallized poly-p-phenylene benzobisoxazole fiber, metallized polyarylate fiber or carbon fiber can be well covered on the first shielding layer, and meanwhile, the materials also have the advantages of light weight and the like.
A preparation method of a shielding wire harness is applied to the shielding wire harness, and comprises the following steps:
step 1, winding the first shielding layer on the first branch core wire, the second branch core wire and the third branch core wire respectively;
step 2, after the step 1 is finished, respectively weaving the second shielding layer on the first branch core wire, the second branch core wire and the third branch core wire, wherein the second shielding layer exceeds the first intersection when being woven on the first branch core wire and the second branch core wire;
step 3, after the step 2 is finished, respectively coating the first branch core wire, the second branch core wire and the third branch core wire with the protective sleeve;
and 4, after the step 3 is finished, covering the rubber protective layer at the first junction and partially covering the protective sleeve.
In one embodiment, in step 1, the first shielding layer is wound twice on the first branch core, the second branch core, and the third branch core.
In one embodiment, in step 1, an overlapping area ratio of the first shielding layer wound around the first branched core, the second branched core, and the third branched core is 25% to 50%.
In one embodiment, in the step 2, the second shielding layer is braided to exceed the first intersection by 15mm to 25mm when the first branched core and the second branched core are braided.
In one embodiment, in the step 2, when the second shielding layer is braided at the first branched core, the second branched core, and the third branched core, a braiding angle α is 30 ° to 60 °.
Drawings
Fig. 1 is a schematic perspective view of a shielding wire harness according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of another direction of a shielded wire harness according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the second shielding layer of FIG. 2 after being wound;
fig. 4 is a partially enlarged schematic view of a portion a in fig. 2.
10. A core wire; 110. a first branched core wire; 120. a second branched core wire; 130. a third branched core wire; 20. a second shielding layer; 30. a third shielding layer; 40. a protective sleeve; 410. a first protective cover; 420. a second protective cover; 430. a third protective sheath; 50. rubber protective layer
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1 and 2, fig. 1 shows a schematic perspective view of a shielding wire harness according to an embodiment of the present invention, and fig. 2 shows a schematic perspective view of a shielding wire harness according to another direction according to an embodiment of the present invention, which includes a core wire 10, a first shielding layer 20, a second shielding layer 30, a protective cover 40, and a rubber protective layer 50. The core wire 10 is used for data transmission between electronic devices in an aircraft, and because there are many electronic devices inside the aircraft and electromagnetic radiation environments are complicated, these electromagnetic radiation environments may affect the data transmission speed of the core wire 10. In order to reduce or avoid the influence on the core wire 10 during data transmission, an electromagnetic shielding design is required. For this purpose, a first shielding layer 20, a second shielding layer 30, a protective jacket 40 and a rubber protective layer 50 are designed to protect the core wire 10.
Specifically, the core 10 includes a first branched core 110 and a second branched core 120, where the first branched core 110 and the second branched core 120 meet at a first intersection and constitute a third branched core 130. Wherein the first intersection is the point pointed by the arrow a in fig. 1. It will be appreciated that because of the complexity of the electronic devices within an aircraft, simultaneous communication of multiple devices is often required. If each electronic device is adopted to transmit by using a separate connecting line, the connecting line is increased and complicated. For this reason, a plurality of branch lines are integrated together, which facilitates subsequent sorting and troubleshooting.
In order to protect the first, second, and third branch cores 110, 120, and 130 from electromagnetic waves, the first shielding layer 20 is wound around the outer surfaces of the first, second, and third branch cores 110, 120, and 130, respectively. Wherein the material of the first shielding layer 20 is a metal foil. Because the first shielding layer is made of the metal foil material, the first shielding layer can achieve a good electromagnetic wave protection effect. Meanwhile, the metal foil material has the advantage of lighter weight compared to conventional shield designs, such as tin-plated copper braided wire shield layers. Therefore, the weight-reducing design requirement of the airplane is better met.
The second shielding layer 30 is woven on the outer surface of the first shielding layer 20, wherein the material of the second shielding layer 30 is metalized aramid. The second shielding layer 30 is woven on the outer surface of the first shielding layer 20, so that the first shielding layer 20 can be fastened on one hand, and the surface coating area of the core wire 10 is denser due to the fact that the second shielding layer is made of the metalized aramid fiber, and the electromagnetic protection effect is further enhanced.
The protective jacket 40 is woven over the second shielding layer 30. Since the second shielding layer 30 is woven on the first shielding layer 20, the first shielding layer 20 and the second shielding layer 30 can be prevented from being damaged by the external environment due to the exposure to the outside, for example, the first shielding layer 20 and the second shielding layer 30 can be prevented from being damaged by the external environment impact, corrosion, and the like. Therefore, after the second shielding layer 30 is completely woven, the first branch core wire 110, the second branch core wire 120, and the third branch core wire 130 are covered with the protection jacket.
Since the first branched core wire 110 and the second branched core wire 120 meet at the first intersection, it is conceivable that the first intersection is hardly covered by the protective cover 40 when covering the first branched core wire 110 and the second branched core wire 120, respectively. Therefore, a rubber protective layer 50 is installed at the first junction, and the first junction is coated by the rubber protective layer 50, so that the coating area of the core wire 10 is increased. The rubber shield 50 partially covers the protective sheath 40 when installed, which has the advantage of improving the tightness of the wiring harness.
In one embodiment, and as shown in fig. 1, the protective cover 40 comprises: a first protective sleeve 410, a second protective sleeve 420, and a third protective sleeve 430. The first protection jacket 410 covers the second shielding layer 30 on the first branch core 110; the second shielding layer 30 in which the second shielding jacket 420 covers the second branched core wire 120; the third shielding sheath 430 covers the second shielding layer 30 on the third branch core wire 130.
In the specific setting, the protecting sleeve 40 has elasticity, so that the protecting sleeve 40 can expand in the process of covering and installing the protecting sleeve 40, and after the protecting sleeve 40 is covered, the protecting sleeve 40 stretches and contracts and is tightly attached to the second shielding layer 30.
In order to cover the first junction, so as to achieve the complete covering of the core wire, in one embodiment, referring to fig. 2, the rubber protective layer 50 covers the first junction and partially covers the protective cover 40. Therefore, the full-coverage cladding of the shielding wire harness can be realized, and the protection effect of the shielding wire harness is further improved. Wherein, rubber inoxidizing coating 50 partial cladding is on lag 40, so can improve the seal of whole shielding pencil, prevents that rainwater etc. from entering into the inside of shielding pencil in the environment, and then influences the shielding effect of shielding pencil.
In one embodiment, the protective sheath 40 is made of a heat shrink tubing material. The heat shrinkable tube has better waterproof, insulating and other properties, so the heat shrinkable tube can better protect the shielding core wire.
In order to improve the electromagnetic wave shielding performance of the first shielding layer 20, in an embodiment, the metal foil of the first shielding layer 20 is a composite film of aluminum or copper and a polyimide film.
In an embodiment, the second shielding layer 30 can also be a metalized poly-p-phenylene benzobisoxazole fiber, a metalized polyarylate fiber, or a carbon fiber, and these materials can also increase the coverage area of the second shielding layer 30 covering the first branch core wire 110, the second branch core wire 120, and the third branch core wire 130, and have a light weight effect.
The invention provides a preparation method of a shielding wire harness, which comprises the following steps:
step 1, winding a first shielding layer 20 on a first branch core wire 110, a second branch core wire 120 and a third branch core wire 130 respectively;
step 2, after the step 1 is finished, respectively weaving the second shielding layer 30 on the first branch core wire 110, the second branch core wire 120 and the third branch core wire 130, wherein the second shielding layer 30 exceeds the first intersection when being woven on the first branch core wire 110 and the second branch core wire 120;
step 3, after the step 2 is finished, respectively coating the protective sleeve 40 on the second shielding layer 30 on the first branch core wire 110, the second branch core wire 120 and the third branch core wire 130;
and 4, after the step 3 is finished, covering the rubber protective layer 50 at the first branch.
In order to minimize electromagnetic radiation interference between the first branch core 110 and the second branch core 120, the first shielding layer 20 is wound around the first branch core 110, the second branch core 120, and the third branch core 130, respectively.
When the length of the first shielding layer 20 is long enough, the first branch core wire 110 or the second branch core wire 120 is covered first, wherein the first branch core wire 110 and the second branch core wire 120 are not in sequence. For example, assuming that the first shielding layer 20 is firstly coated on the first branch core wire 110, when the first branch core wire 110 is coated, that is, coated on the first junction, the first shielding layer 20 is not sheared, and the second branch core wire 120 is continuously coated. After the first shielding layer 20 covers the second branch core wire 120, the first shielding layer 20 is cut off, the first shielding layer 20 covers the third branch core wire 130 from the first intersection, and after the first shielding layer 20 covers the third branch core wire 130, the first shielding layer 20 is cut off. When the length of the first shielding layer 20 is not enough, the first shielding layer 20 is rewound again from the end. The effect diagram after the first shielding layer 20 is wound around the first branch core 110, the second branch core 120 and the third branch core 130 is shown in fig. 3.
When the first shielding layer 20 is completely wound around the first branched core 110, the second branched core 120 and the third branched core 130, the second shielding layer 30 is further braided on the first branched core 110 or the second branched core 120, wherein the braiding order of the first branched core 110 and the second branched core 120 is not sequential. For example, when the second shielding layer 30 is woven on the first branched core 110 first, the weaving range of the second shielding layer 30 needs to exceed the first intersection after the first branched core 110 is woven. The purpose is to cover the first junction to improve the electromagnetic protection effect. Then, the second shielding layer 30 is woven on the second branch core wire 120, and similarly, after the second branch core wire 120 is woven, the weaving range thereof needs to exceed the first intersection.
After the second shielding layer 30 is braided on the first branch core wire 110 and the second branch core wire 120, the second shielding layer 30 is braided on the third branch core wire 130, wherein the second shielding layer 30 is braided on the third branch core wire 130 from the first intersection, so that the part of the second shielding layer 30 exceeding the first intersection when being braided on the first branch core wire 110 and the part of the second shielding layer 30 exceeding the first intersection when being braided on the second branch core wire 120 can be simultaneously covered, thereby improving the tightness of the cladding of the core wire 10 and further improving the electromagnetic wave resistance of the wire harness 10.
Since the protective cover 40 is used to protect the first shielding layer 20 and the second shielding layer 30, the protective cover 40 is required to cover the first shielding layer 20 and the second shielding layer 30 after the process is finished.
Finally, since the first branch is not protected, after the step of covering the protective jacket 40 is finished, a rubber protective layer 50 needs to be covered on the first branch, wherein the rubber protective layer 50 needs to be covered on the first branch and the protective jacket 40 needs to be covered, so as to improve the tightness of the shielding harness.
In one embodiment, in the step 1, the first shielding layer 20 is wound twice on the first branch core 110, the second branch core 120 and the third branch core 130.
In order to improve the electromagnetic wave resistance of the wire harness, the first shielding layer 20 is cut after the first branch core wire 110, the second branch core wire 120 and the third branch core wire 130 are wound for the first time, and the first shielding layer 20 is wound on the first branch core wire 110, the second branch core wire 120 and the third branch core wire 130 again.
In one embodiment, in step 1, when the first shielding layer 20 is respectively wound around the first branched core 110, the second branched core 120 and the third branched core 130, the overlapping area ratio of the first shielding layer 20 wound around the first branched core 110, the second branched core 120 and the third branched core 130 is 25% to 50%.
When the first shielding layer 20 is wound on the first branched core 110, the second branched core 120 and the third branched core 130, the subsequent winding coincides with the previous winding, and the coincidence area ratio is 25% to 50%. This has the advantage of avoiding a gap between the previous winding and the subsequent winding, thereby allowing the core wire 10 to be completely covered with the first shielding layer 20.
In one embodiment, in step 2, the second shielding layer 30 is respectively braided on the first branched core wire 110 and the second branched core wire 120, and exceeds the first junction by 15mm to 25mm, and then is braided on the third branched core wire.
When the second shield layer 30 is braided on the first branched core wire 110 and the second branched core wire 120, in order to cover the first intersection as much as possible, it is necessary to be braided on the first branched core wire 110 and the second branched core wire 120 by 15mm to 25mm beyond the first intersection. In addition, when the second shield layer 30 is braided on the third branched core wire 130, the excess portions of the first and second branched core wires 110 and 120 are covered, so that the second shield layer 30 can be tightly braided on the first and second branched core wires 110 and 120.
In one embodiment, in step 2, when the second shielding layer 30 is braided on the first branched core 110, the second branched core 120 and the third branched core 130, the braiding angle α is 30 ° to 60 °.
In order to increase the coverage area of the second shielding layer 30 braided on the first branched core wire 110, the second branched core wire 120 and the third branched core wire 130, the braiding angle α of the second shielding layer 30 is 30 ° to 60 °, wherein the α angle is the angle between the braiding direction of the second shielding layer 30 and the horizontal direction, as shown in fig. 4. In such a range of the braid angle, the coverage of the second shield layer 30 to the core wire 10 is 70% to 98%.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A shielded wire harness, characterized by comprising:
a core wire, the core wire comprising: a first branched core and a second branched core, the first branched core and the second branched core meeting at a first intersection and constituting a third branched core;
the first shielding layer is respectively wound on the outer surfaces of the first branch core wire, the second branch core wire and the third branch core wire, and the first shielding layer is made of metal foil;
the second shielding layer is braided on the outer surface of the first shielding layer, the second shielding layer is respectively braided on the first branch core wire, the second branch core wire and the third branch core wire, the second shielding layer is braided on the first branch core wire and the second branch core wire and exceeds the first intersection, and the second shielding layer is made of metalized aramid fiber;
the protective sleeve covers the second shielding layer;
the rubber protective layer is coated on the first intersection and partially coated on the protective sleeve.
2. The shielded wire harness of claim 1, wherein the protective sleeve comprises: the first protection sleeve covers the second shielding layer on the first branch core wire; the second protection sleeve is coated on the second shielding layer of the second branch core wire; and the third protection sheath is coated on the second shielding layer of the third branch core wire.
3. The shielded wire harness of claim 1, wherein the protective jacket is a heat shrink tubing.
4. The shielded wire harness of claim 1, wherein the metal foil can also be a composite film of aluminum or copper with a polyimide film.
5. The shielded wire harness of claim 1, wherein the material of the second shield layer can also be metalized poly-p-phenylene benzobisoxazole fibers, metalized polyarylate fibers, or carbon fibers.
6. A method of producing a shielded wire harness applied to the shielded wire harness according to any one of claims 1 to 5, characterized by comprising the steps of:
step 1, winding the first shielding layer on the first branch core wire, the second branch core wire and the third branch core wire respectively;
step 2, after the step 1 is finished, respectively weaving the second shielding layer on the first branch core wire, the second branch core wire and the third branch core wire, wherein the second shielding layer exceeds the first intersection when being woven on the first branch core wire and the second branch core wire;
step 3, after the step 2 is finished, respectively coating the protecting sleeves on the first branch core wire, the second branch core wire and the third branch core wire;
and 4, after the step 3 is finished, covering the rubber protective layer at the first junction and partially covering the protective sleeve.
7. The method of producing a shielded wire harness according to claim 6, wherein in the step 1, the first shielding layer is wound twice on the first branched core, the second branched core, and the third branched core.
8. The method of producing a shielded wire harness according to claim 6, wherein in the step 1, an overlapping area ratio at which the first shielding layer is wound around the first branched core, the second branched core, and the third branched core is 25% to 50%.
9. The method of producing a shielded wire harness according to claim 6, wherein in the step 2, the second shield layer is braided over the first intersection 15mm to 25mm when the first branched core and the second branched core are braided.
10. The method of producing a shielded wire harness according to claim 6, wherein in the step 2, a braiding angle α at which the second shielding layer is braided at the first branched core, the second branched core, and the third branched core is 30 ° to 60 °.
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| CN114267480A (en) * | 2021-11-29 | 2022-04-01 | 中航光电科技股份有限公司 | Scattered wire multi-branch plastic package structure and manufacturing method thereof |
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