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CN-114388177-B - Power and/or control cable for mobile applications

CN114388177BCN 114388177 BCN114388177 BCN 114388177BCN-114388177-B

Abstract

The present disclosure relates to a flexible cable (1) for mobile applications, comprising one or more insulating core wires (2, 3), a filler layer (4) surrounding the one or more insulating core wires (2, 3) having an outer surface (6) defining a filler layer outer perimeter (7), the filler layer outer perimeter (7) essentially forming a closed convex polygon chain having a plurality of line segments connecting consecutive vertices, and an outer jacket (8) surrounding the filler layer (4) and applied directly on the filler layer (4) having an outer surface (10) defining an outer jacket outer perimeter (11), the outer jacket outer perimeter (11) forming a continuous closed curve.

Inventors

  • F. Garofi
  • 5. A. brambati
  • E. Rhoda

Assignees

  • 普睿司曼股份公司

Dates

Publication Date
20260508
Application Date
20210916
Priority Date
20201022

Claims (18)

  1. 1. Flexible cable (1) for mobile applications comprising torsional stresses, comprising: -one or more insulated cores (2, 3); -an extruded polymer filler layer (4) surrounding the one or more insulating core wires (2, 3) having an outer surface (6) defining a filler layer outer periphery (7), the filler layer outer periphery (7) essentially forming a closed convex polygon chain having a plurality of line segments connecting consecutive vertices, and An outer sheath (8) surrounding the filler layer (4) and applied directly on the filler layer (4) with an outer surface (10) defining a substantially circular outer sheath outer perimeter (11), The filler layer (4) also has an inner surface (5) radially opposite to the outer surface (6) of the filler layer (4), wherein in a cross-section on a plane orthogonal to the longitudinal axis of the flexible cable (1), the outer surface (6) of the filler layer (4) is polygonal in shape, the inner surface (5) of the filler layer (4) being in direct contact with the outer surface of the one or more insulating cores (2, 3).
  2. 2. Flexible cable (1) according to claim 1, wherein the outer jacket (8) has an inner surface (9) radially opposite to an outer surface (10) of the outer jacket (8), wherein the inner surface (9) of the outer jacket (8) is in direct contact and conforms to the outer surface (6) of the filler layer (4).
  3. 3. The flexible cable (1) according to claim 1, wherein the outer jacket (8) has an inner surface (9) radially opposite to an outer surface (10) of the outer jacket (8), the flexible cable (1) further comprising anti-sway means at an interface of the inner surface (9) of the outer jacket (8) and the outer surface (6) of the filler layer (4).
  4. 4. A flexible cable (1) according to claim 3 wherein the anti-sway device comprises one or more embedded wires (12).
  5. 5. Flexible cable (1) according to any of claims 1-4 wherein the line segment of the filler layer outer perimeter (7) is a straight or curved line segment.
  6. 6. Flexible cable (1) according to claim 5 wherein the curved section of the filler layer outer periphery (7) is convex.
  7. 7. Flexible cable (1) according to any of claims 1-4 wherein the apex of the filler layer outer perimeter (7) is shaped as the point where two consecutive line segments meet.
  8. 8. Flexible cable (1) according to any of claims 1-4 wherein the apex of the filler layer outer perimeter (7) is rounded.
  9. 9. Flexible cable (1) according to any of claims 1-4 wherein the number of vertices of the filler layer outer perimeter (7) is at least 4.
  10. 10. Flexible cable (1) according to any of claims 1-4 wherein the filler layer outer perimeter (7) forms substantially a regular octagon.
  11. 11. Flexible cable (1) according to any of claims 1-4 wherein the outer jacket (8) is applied onto the filler layer (4) by extrusion.
  12. 12. Flexible cable (1) according to any of claims 1-4 wherein the filler layer (4) and the outer jacket (8) are made of a polymer selected from the group consisting of crosslinked elastomers, thermoplastic polymers and any combination thereof.
  13. 13. Flexible cable (1) according to claim 12 wherein the crosslinked elastomer comprises a synthetic rubber.
  14. 14. The flexible cable (1) according to claim 12 wherein the crosslinked elastomer comprises any of polychloroprene, chlorosulfonated polyethylene, halogen-free crosslinked elastomer.
  15. 15. Flexible cable (1) according to claim 12 wherein the thermoplastic polymer comprises any of polyethylene, polypropylene, polyvinylchloride, polyurethane, polyester.
  16. 16. Flexible cable (1) according to claim 12 wherein the thermoplastic polymer comprises a crosslinked polyethylene.
  17. 17. Flexible cable (1) according to claim 12 wherein the thermoplastic polymer comprises a halogen-free thermoplastic polymer.
  18. 18. Flexible cable (1) according to any of claims 1-4 wherein the filler layer (4) and the outer jacket (8) are both made of a crosslinked elastomer.

Description

Power and/or control cable for mobile applications Technical Field The present disclosure relates to a flexible power and/or control cable for mobile applications. In particular, the present disclosure relates to cables, for example, suitable for three-phase AC and/or single-phase AC and/or DC installations and/or cables, for example, comprising optical fibers, suitable for transmitting signals or data. The cable of the present disclosure is a flexible cable, for example, for connecting movable parts of a machine tool or any material handling equipment associated with high mechanical stress, frequent bending or twisting operations, or rapid movements with high accelerations. Background Flexible cables for the above applications comprise an electrically insulating inner sheath, for example made of rubber, which encloses a plurality of core wires, for example comprising phase conductors and/or optical fibers, and possibly other components such as ground conductors, depending on the type of cable. The outer sheath encloses the inner sheath. In cross section, the inner sheath outer surface and the outer sheath inner surface have circular perimeters, so the outer sheath tends to twist slide relative to the inner sheath under torsional stress. To avoid such sliding and possible detachment of the outer sheath from the inner sheath, known flexible cables comprise anti-sway protectors, such as synthetic wires embedded at the interface of the outer sheath and the inner sheath. US 2,583,026A describes a cable comprising two stranded conductors, a conductor insulator surrounding each conductor, and an outer jacket surrounding the whole. The conductor insulator is formed such that an outer surface of the conductor insulator is corrugated to include alternating ribs separated by grooves. The material of the ribbed insulation is a rubber insulation compound, i.e. an elastomer. However, in the case of corrugated outer surfaces, the combined use of elastomers is problematic from a manufacturing point of view, because it is difficult to fill the grooves, and the resulting mechanical properties may be poor. Furthermore, the corrugated shape with alternating ribs and grooves requires a suitable width in order to avoid possible rubber fracture. Other special cables not used for mobile applications may have an outer jacket surrounding the non-circular layer, such as in some examples listed below. CN 110491590a discloses a halogen-free low-smoke flame-retardant cable with three conductors, wherein the cross section of a first insulating sheath surrounding the conductors is annular, the cross section of a second insulating sheath has a special annular shape with square outside and circular inside, and the cross section of a flame-retardant jacket has a hexagonal annular shape. CN 206075924U discloses a high-strength flame-retardant fire-resistant cable comprising an insulating layer having a regular octagon in cross section, eight cable cores disposed in the cross section being a regular octagon polyester skeleton, wherein the insulating wire cross section of the cable cores is regular octagon and the eight cable cores are arranged in proper order. EP 3 637 164A1 discloses a ballistic gun-type optical fiber loose tube cable comprising a nonmetallic central strength element, an outer jacket made of PE, an inner jacket, water-swellable yarns and a protective strength element comprising flat fiber reinforced plastic elements arranged in a polygonal fashion. Disclosure of Invention Accordingly, applicant intends to provide a flexible cable with improved torsion resistance for use on movable parts. This object is achieved by a flexible cable having a filler layer containing one or more insulating core wires and having a polygonal outer contour and an outer jacket having an outer circular contour applied directly over the outer polygonal contour of the filler layer. Experimental tests have shown that under the same torsional stress conditions, the torsional movement of the outer sheath relative to the inner filler layer is significantly lower than in comparable flexible cables according to the prior art. Just like the flexible cables according to the prior art, the flexible cable according to the present disclosure has rounded corners, in particular circular shapes, on the outside. Thus, the prior art flexible cable can be easily replaced with the flexible cable of the present disclosure having higher torsional strength. Accordingly, the present disclosure relates to a flexible cable for mobile applications, comprising: -one or more insulated cores; A filler layer surrounding the one or more insulating core wires, having an outer surface defining an outer filler layer periphery, the outer filler layer periphery substantially forming a closed convex polygon chain having a plurality of line segments connecting the continuous vertices, and An outer sheath surrounding and applied directly over the filler layer, having an outer surface defin