Polyimide enameled insulation instrument cable

Abstract

The utility model belongs to the technical field of cables, and provides a polyimide enameled insulation instrument cable, which comprises a wire core and an outer sheath, the wire core comprises a conductor and an insulation layer, the insulation layer is arranged outside the conductor, the conductor is a bare copper conductor, and the insulation layer is a polyimide paint layer; the outer protective layer is arranged outside the wire core, and the outer protective layer is formed by winding a polyimide wrapping tape outside the wire core; the wire core is divided into a central wire core and a twisted wire core, and the twisted wire core is formed by winding around the central wire core with the central wire core as the center. According to the utility model, the polyimide paint layer is used as the insulating layer, thereby reducing the size of the wire core and improving insulation and moisture resistance; meanwhile, the polyimide wrapping tape is adopted outside the insulating layer to form the outer protective layer, so that the insulating property can be enhanced, and the temperature resistance can be improved; because the insulating layer and the outer protective layer are made of the same material, the insulating layer and the outer protective layer are not easy to adhere and erode with each other, the insulating layer and the outer protective layer are kept relatively independent, and the weather resistance and the aging resistance are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a polyimide enameled insulated instrument cable. Background Art

[0002] With the development and progress of special equipment, various equipment and instruments used in special environments need to be equipped with transmission lines that adapt to their application environments. Especially in the advanced equipment in the fields of aviation, aerospace, military industry and scientific research, the requirements for cables are more stringent, and they often need to withstand extreme temperature conditions, mechanical stress and long-term weather resistance.

[0003] At present, the insulation layer and the outer sheath are often made of different materials, which are prone to adhesion and corrosion. In order to avoid adhesion between the insulation layer and the outer sheath, the usual practice is to add an isolation layer, which increases the outer diameter of the cable. Utility Model Content

[0004] In view of the defects in the prior art, the utility model provides a polyimide enameled insulated instrument cable to solve the problem that the insulation layer and the outer sheath are made of different materials, which easily causes adhesion and erosion.

[0005] The utility model provides a polyimide enameled insulated instrument cable, comprising:

[0006] A wire core, wherein the wire core comprises a conductor and an insulating layer, wherein the insulating layer is arranged outside the conductor, wherein the conductor is a bare copper wire, and the insulating layer is a polyimide paint layer; the wire core is divided into a central wire core and a twisted wire core, wherein the twisted wire core is formed by winding around the central wire core with the central wire core as the center;

[0007] The outer sheath is arranged outside the wire core, and the outer sheath is formed by winding a polyimide tape around the wire core.

[0008] It can be seen from the above technical scheme that the polyimide enameled insulated instrument cable provided by the utility model adopts a polyimide lacquer layer as the insulating layer, which can reduce the wire core size and improve the insulation moisture resistance; at the same time, a polyimide tape is wrapped around the outside of the insulating layer to form an outer sheath, which can enhance the insulation performance and improve the temperature resistance; since the insulating layer and the outer sheath are made of the same material, it is not easy for them to adhere to each other and corrode each other, so the insulating layer and the outer sheath are kept relatively independent, thereby enhancing weather resistance and aging resistance.

[0009] Optionally, the thickness of the insulating layer is 0.02-0.025 mm.

[0010] Optionally, the twisted wire core has a twisted pitch diameter ratio of 60-70 times.

[0011] Optionally, an adhesive layer is provided on the outer surface of the outer protective layer, and the adhesive layer is located on one side of the outer protective layer.

[0012] Optionally, the width of the adhesive layer is 45%-50% of the width of the outer protective layer.

[0013] Optionally, the outer protective layer is formed by overlapping and wrapping polyimide tapes, with an overlap rate of 45%-50%.

[0014] Optionally, the polyimide tape has a width of 10-25 mm and a thickness of 0.25-0.27 mm.

[0015] By adopting the above technical solution, this application has the following technical effects:

[0016] The utility model adopts a polyimide paint layer as the insulating layer, which has a very small thickness, can reduce the size of the wire core, and improve the moisture resistance of the insulation; at the same time, an outer sheath is formed by wrapping outside the insulating layer, which can enhance the insulation performance and improve the temperature resistance. The insulating layer and the outer sheath are made of the same material, and are not prone to adhesion erosion. The insulating layer and the outer sheath are kept relatively independent, and the weather resistance and aging resistance are enhanced;

[0017] The outer sheath of the utility model adopts a single-sided half-edge adhesive polyimide tape, which can be bonded into a sleeve shape without heat treatment, thereby improving the sealing performance, stabilizing the overall structure of the cable, and improving the reliability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0019] Figure 1 A cross-sectional view of a polyimide enameled insulated instrument cable provided in an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of a polyimide enameled insulated instrument cable provided in an embodiment of the utility model;

[0021] Figure 3 A schematic diagram of an outer protective layer provided in an embodiment of the utility model.

[0022] Reference numerals:

[0023] 1-wire core; 11-conductor; 12-insulation layer; 2-outer sheath; 21-rubber layer. DETAILED DESCRIPTION

[0024] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0025] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0026] In the description of the present application, it should be understood that the terms "width", "thickness", "up", "down", "front", "back", "bottom", "inside", "outside", etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are 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 should not be understood as a limitation on the present invention.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] Example 1

[0029] like Figure 1-2 As shown, this embodiment provides a polyimide enameled insulated instrument cable, including a core 1 and an outer sheath 2. The core 1 includes a conductor 11 and an insulating layer 12. The insulating layer 12 is arranged outside the conductor 11. The conductor 11 is a bare copper conductor, and the insulating layer 12 is a polyimide lacquer layer. The outer sheath 2 is arranged outside the core 1, and the outer sheath 2 is formed by winding a polyimide tape around the core 1. The core 1 is divided into a central core and a twisted core. The twisted core is formed by winding around the central core with the central core as the center.

[0030] Among them, the twisted pitch diameter ratio of the twisted wire core is 60-70 times.

[0031] Optionally, a glue layer 21 is provided on one side of the outer sheath 2, and the glue layer 21 is located on one side of the outer sheath 2. Figure 3As shown, the width l1 of the adhesive layer 21 accounts for 45%-50% of the width l2 of the outer sheath 2. The outer sheath 2 is formed by overlapping and wrapping the polyimide tape, and the overlap rate is 45%-50%. The overlap rate of the outer sheath 2 is adapted to the proportion of the adhesive layer of the outer sheath 2. The outer sheath is formed by winding with a horizontal wrapping machine. The outer sheath 2 uses a polyimide tape with a thickness of 0.25 mm and a width of 10 mm. One side of the polyimide tape is coated with adhesive. When winding, the adhesive side is the outer surface, and the latter winding circle overlaps the previous circle.

[0032] The production of the polyimide enameled insulated instrument cable provided in this embodiment specifically includes the following steps:

[0033] Step 1. Select a round copper single wire of a certain structural size as the conductor according to the current carrying requirements;

[0034] Step 2. The insulating layer 12 is made of polyimide paint material, and the insulating layer 12 is processed by a coating process, and the thickness of the polyimide paint layer is 0.02-0.025 mm; the polyimide paint layer is used as the insulating layer 12, and the thickness is very small, which can reduce the size of the wire core 1 and ensure the insulation moisture resistance;

[0035] Step 3. The wire core 1 coated with polyimide paint is twisted into a cable, wherein one wire is used as a center wire and the other six wires are wound around the center wire, and the outer conductor twisting pitch ratio is 60-70 times;

[0036] Step 4. During the twisting process of the conductor 11, a back-twisting method is used to prevent the single wire from twisting, and the twisting tension is set to 10-20N;

[0037] Step 5. The outer sheath 2 of the cable is wound with a polyimide tape, one side of the selected polyimide tape has an adhesive layer, the adhesive layer 21 accounts for 45%-50%, and the thickness of the polyimide tape is 0.25-0.27mm;

[0038] Step 6. The outer sheath 2 is wrapped in a concentric manner, and the width of the polyimide wrapping tape used is 10-25 mm;

[0039] Step 7. Wrap the outer sheath 2 in an overlapping manner, with the overlap rate controlled at 45%-50%, and the wrapping tension controlled at 5N-10N.

[0040] Example 2

[0041] like Figure 1As shown, this embodiment uses a copper single wire with an outer diameter of 0.6 mm as the conductor 11, and a polyimide paint layer with a thickness of 0.02 mm is uniformly coated on the outside of the conductor 11 as the insulating layer 12 to form a wire core 1 with an insulating layer 12; 7 wire cores are used, one of which is used as the central wire core, and the other six are wound around the central wire core, and the twisted pitch ratio is 60. After twisting, a twisted wire core with an outer diameter of 1.8±0.05 mm is obtained.

[0042] Then, a horizontal wrapping machine is used to wind the outer sheath 2. The outer sheath 2 is made of polyimide tape. The thickness of the polyimide is 0.25 mm and the width is 10 mm. One side of the single side is coated with glue, and the glue accounts for 45%-50% of the outer surface of the tape. When winding, the adhesive side faces outward, and the wrapping method is overlapping wrapping. Considering the thickness and bonding width, the wrapping overlap rate of the polyimide tape in this embodiment is 45%-50%, and the number of wrapping layers is 1.

[0043] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A polyimide enameled insulated instrument cable, characterized in that: include: A wire core, wherein the wire core comprises a conductor and an insulating layer, wherein the insulating layer is arranged outside the conductor, wherein the conductor is a bare copper wire, and the insulating layer is a polyimide paint layer; the wire core is divided into a central wire core and a twisted wire core, wherein the twisted wire core is formed by winding around the central wire core with the central wire core as the center; The outer sheath is arranged outside the wire core, and the outer sheath is formed by winding a polyimide tape around the wire core.

2. The polyimide enameled insulated instrument cable according to claim 1, characterized in that: The thickness of the insulating layer is 0.02-0.025 mm.

3. The polyimide enameled insulated instrument cable according to claim 1, characterized in that: The twisted wire core has a twisted pitch-diameter ratio of 60-70 times.

4. The polyimide enameled insulated instrument cable according to claim 1, characterized in that: The outer surface of the outer protective layer is provided with a glue layer, and the glue layer is located on one side of the outer protective layer.

5. The polyimide enameled insulated instrument cable according to claim 4, characterized in that: The width of the adhesive layer is 45%-50% of the width of the outer protective layer.

6. The polyimide enameled insulated instrument cable according to claim 5, characterized in that: The outer protective layer is formed by overlapping and wrapping polyimide tapes, and the overlapping rate is 45%-50%.

7. The polyimide enameled insulated instrument cable according to claim 6, characterized in that: The width of the polyimide tape is 10-25 mm and the thickness is 0.25-0.27 mm.

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