WO2015102028A1 - High efficiency rope, in particular for controlling wing profiles - Google Patents

High efficiency rope, in particular for controlling wing profiles Download PDF

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Publication number
WO2015102028A1
WO2015102028A1 PCT/IT2014/000311 IT2014000311W WO2015102028A1 WO 2015102028 A1 WO2015102028 A1 WO 2015102028A1 IT 2014000311 W IT2014000311 W IT 2014000311W WO 2015102028 A1 WO2015102028 A1 WO 2015102028A1
Authority
WO
WIPO (PCT)
Prior art keywords
rope
strands
substance
threads
high efficiency
Prior art date
Application number
PCT/IT2014/000311
Other languages
French (fr)
Inventor
Massimo IPPOLILTO
Original Assignee
Kite Gen Research S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kite Gen Research S.R.L. filed Critical Kite Gen Research S.R.L.
Publication of WO2015102028A1 publication Critical patent/WO2015102028A1/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
    • D07B1/162—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber enveloping sheathing
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B5/00—Making ropes or cables from special materials or of particular form
    • D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2001—Wires or filaments
    • D07B2201/201—Wires or filaments characterised by a coating
    • D07B2201/2012—Wires or filaments characterised by a coating comprising polymers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2042—Strands characterised by a coating
    • D07B2201/2044—Strands characterised by a coating comprising polymers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2075—Fillers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/2065—Reducing wear
    • D07B2401/207—Reducing wear internally

Definitions

  • the present invention refers to a high efficiency rope, in particular for controlling wing profiles .
  • a high efficiency rope for wing profile is used in particular for transmitting wind energy to a winch or hoist.
  • winches and hoists for transmitting energy has become important in the field of wind energy management, wherein winches and hoists, connected to alternators and electronic apparatuses, are used to extract the wind kinetic energy and to convert mechanical energy into electric energy.
  • a process for extracting energy from wind implies the use of high-resistance ropes.
  • the tension of the ropes is generated by the lift of a kite flying with transverse wind.
  • the drum, onto which the rope is wound, rotates due to the unwinding force induced by the rope.
  • the mechanical power is generated by the combination of the mechanical tension in the rope and the speed with which the rope is stretched, being unwound from the drum.
  • the wind kinetic energy is first of all converted into mechanical energy, due to the friction between the rope and the contact surface of the drum, then it is converted into electric energy through alternators connected to the winch.
  • Friction inside the rope is generated by relative displacements and deformations of different threads and strands, composing the rope and geometrically arranged in order to mutually rub themselves.
  • friction between rope and drum is the necessary ingredient to allow the winch to extract energy from the rope, whicle friction depending on any relative displacement between rope and drum and between the various strands composing the rope must be reduced to a minimum.
  • a first problem depending on the variable load acting on a rope is given by the fact that each strand composing the rope is elastically deformed, generating a relative rubbing against the surface of contiguous strands. In this way, wear of the rope is accelerated, by raising the temperature.
  • the interstices depending on size, amount and geometric arrangement of the strands are easily occupied by various types of pollutants, for example sand, whose shape and hardness are such as to scratch the surface of the strands, drastically reducing the rope life.
  • a second problem depending on the variable load acting on a rope is given by the fact that the rope is generally subjected to air-elastic phenomena of unstableness, greatly depending on a circular transverse section profile subjected to an alternate detachment of vortexes and following vibrations .
  • ropes are employed which are composed of strands coated with protective material in order to reduce rubbing between contiguous strands.
  • Document WO2011144471 discloses a method for producing a metallic cable having three concentric levels coated with a rubbery substance. This metallic cable comprises: a first level or core composed of a series of strands; a second level composed of strands helically wound around the strands of the first level with a certain pitch; a third level of strands wound around the strands of the second level with an helix having a certain pitch.
  • the method provides for a step in which the strands of the second level are assembled around the strands of the first level, followed by a step in which the strands of the first and of the second level are coated with rubber by means of an extrusion head, and a step in which the strands of the third level are assembled around the assembled strands of the first and of the second level, and then rubber- coated from inside.
  • Rubber is preferably an elastomer .
  • object of the present invention is solving the above prior art problems by providing a high efficiency rope, in particular for controlling wing profiles, which allows a higher energy productivity and a reduction of power losses due to friction phenomena and in favor of a reduced wear.
  • Another object of the present invention is providing a high efficiency rope, in particular for controlling wing profiles, composed of threads and strands and comprising at least one substance adapted to coat such threads and strands avoiding their mutual contact and compensating the related elastic deformation.
  • FIG. 1 shows a cross-sectional view of a preferred embodiment of a rope with strands lacking an external coating
  • FIG. 2 shows a cross-sectional view of a first preferred embodiment of a rope according to the present invention
  • - Figure 3 shows a cross-sectional view of a variation of the rope of Figure 2; and - Figure 4 shows a cross-sectional view of a further variation of the rope of Figure 2.
  • the terminals of a rope 1 are respectively connected to a working load (not shown) and to a storage device (not shown) according to a tension gradient which establishes a maximum value of tension at one terminal and a minimum or null value at its opposite terminal.
  • the high-efficiency rope 1, in particular for controlling at least one wing profile according to the present invention is composed of threads and strands 11, 21, 31 and comprises at least one substance 12, 22, 32 coating and/or impregnating such threads and strands 11, 21, 31, such substance being adapted to prevent a mutual contact between such threads and strands 11, 21, 31 and to compensate a relative elastic deformation between the threads and strands 11, 21, 31 themselves.
  • the rope 1 according to the present invention is preferably composed of three concentric levels 10, 20, 30 (as shown, for example, in Figure 3) .
  • a central thread 11 having a big diameter composes a first level 10.
  • First strands 21 composing a second level 20 are helically wound with a certain pitch around the first level 10.
  • Second strands 31 composing a third level 30 are helically wound with a certain pitch around the second level 20.
  • the thread 11 and the strands 21, 31 are respectively coated by such substance preferably as at least one rubbery sheath 12, 22, 32 (as shown, for example, in Figure 2) .
  • At least one sheath 41 externally coats the rope 1 composed of the three levels 10, 20, 30.
  • the sheath 41 adheres to the bunch of strands composing the levels 10, 20, 30 (as shown, for example, in Figure 3) .
  • the sheath 41 can assume a shape having a wing profile (as shown, for example, in Figure 4) .
  • the process provides for the injection through an extruder of a rubbery substance capable of filling the interstices 13, 23, 33, 43 arranged on the levels 10, 20, 30 and adhering to the internal wall of the sheath 41 (as shown, for example, in Figures 3 and 4) .
  • the strands can be made of metallic or plastic material, for example polyethilene .
  • the rubbery substance and the external coating 41 are made of at least one elastomer such as, for example, silicone.
  • the high efficiency rope 1 allows obtaining the stated objectives, since each strand composing the rope is elastically deformed independently, allowing the substance 12, 22, 32 to be deformed without getting in contact with the contiguous strands.
  • the interstices 13, 23, 33, 43 are occupied by the rubbery substance, which precludes pollution of atmospheric agents and of dangerous particles, such as sand grains.
  • the external sheath 41 further protects the rope 1 from atmospheric agents .
  • the embodiment with a rope 1 equipped with a filling of interstices and wound by an external sheath occurs according to the known art in the field of strand-type ropes.

Landscapes

  • Ropes Or Cables (AREA)

Abstract

A rope (1) is described, in particular for controlling at least one wing profile, comprising at least one thread (11) and strands (21, 31) made of metallic or plastic material, as elements supporting a tension load, wherein the rope (1) comprises at least one substance (12, 22, 32) coating, and preferably impregnating, the threads+ and strands (11, 21, 31), such substance being, adapted to prevent a mutual contact between the threads and strands (11, 21, 31) and to compensate, through its own elastic deformation, a relative elastic deformation between the threads and strands (11, 21, 31), in which the substance (12, 22, 32) is adapted to fill interstices (13, 23, 33, 43) between the threads and strands (11, 21, 31) making the rope (1) compact, and the substance (12, 22, 32) is at least one elastomer.

Description

HIGH EFFICIENCY ROPE, IN PARTICULAR FOR CONTROLLING WING PROFILES
The present invention refers to a high efficiency rope, in particular for controlling wing profiles .
A high efficiency rope for wing profile is used in particular for transmitting wind energy to a winch or hoist.
Recently, the application of winches and hoists for transmitting energy has become important in the field of wind energy management, wherein winches and hoists, connected to alternators and electronic apparatuses, are used to extract the wind kinetic energy and to convert mechanical energy into electric energy.
An important aspect in recovering mechanical energy from ropes connected to a moving load is given by the efficiency of the rope.
A process for extracting energy from wind implies the use of high-resistance ropes. The tension of the ropes is generated by the lift of a kite flying with transverse wind. The drum, onto which the rope is wound, rotates due to the unwinding force induced by the rope. The mechanical power is generated by the combination of the mechanical tension in the rope and the speed with which the rope is stretched, being unwound from the drum.
During this process, the wind kinetic energy is first of all converted into mechanical energy, due to the friction between the rope and the contact surface of the drum, then it is converted into electric energy through alternators connected to the winch.
During the conversion, energy losses occurs as heat, which heats the contact surface of the drum and increases the internal temperature of the rope impairing the mechanical properties due to the overheating .
Friction inside the rope is generated by relative displacements and deformations of different threads and strands, composing the rope and geometrically arranged in order to mutually rub themselves. On the other hand, friction between rope and drum is the necessary ingredient to allow the winch to extract energy from the rope, whicle friction depending on any relative displacement between rope and drum and between the various strands composing the rope must be reduced to a minimum.
A first problem depending on the variable load acting on a rope is given by the fact that each strand composing the rope is elastically deformed, generating a relative rubbing against the surface of contiguous strands. In this way, wear of the rope is accelerated, by raising the temperature. The interstices depending on size, amount and geometric arrangement of the strands are easily occupied by various types of pollutants, for example sand, whose shape and hardness are such as to scratch the surface of the strands, drastically reducing the rope life.
A second problem depending on the variable load acting on a rope is given by the fact that the rope is generally subjected to air-elastic phenomena of unstableness, greatly depending on a circular transverse section profile subjected to an alternate detachment of vortexes and following vibrations .
According to the prior art, ropes are used for dragging wing profiles which are made in order to reduce the air-elastic unstableness . Document WO2013085800 discloses a wind energy device for converting wind energy or for vehicle propulsion, comprising a mobile sail equipped with tie-rods to perform elliptical trajectories and connected to a drum of a winch through a cable coated with a flexible sheath having its cross section shaped as an aerodynamic profile.
According to the prior art referred to making ropes with strands for different uses, ropes are employed which are composed of strands coated with protective material in order to reduce rubbing between contiguous strands. Document WO2011144471 discloses a method for producing a metallic cable having three concentric levels coated with a rubbery substance. This metallic cable comprises: a first level or core composed of a series of strands; a second level composed of strands helically wound around the strands of the first level with a certain pitch; a third level of strands wound around the strands of the second level with an helix having a certain pitch. The method provides for a step in which the strands of the second level are assembled around the strands of the first level, followed by a step in which the strands of the first and of the second level are coated with rubber by means of an extrusion head, and a step in which the strands of the third level are assembled around the assembled strands of the first and of the second level, and then rubber- coated from inside. Rubber is preferably an elastomer .
Documents WO-Al-2009/026730, US-A-4 550 559, US-A-4 085 183 and US-A-3 911 785 disclose ropes according to the preamble of Claim 1.
Therefore, object of the present invention is solving the above prior art problems by providing a high efficiency rope, in particular for controlling wing profiles, which allows a higher energy productivity and a reduction of power losses due to friction phenomena and in favor of a reduced wear.
Another object of the present invention is providing a high efficiency rope, in particular for controlling wing profiles, composed of threads and strands and comprising at least one substance adapted to coat such threads and strands avoiding their mutual contact and compensating the related elastic deformation.
The above and other objects and advantages of the invention, as will appear from the following description, are obtained with a high efficiency rope, in particular for controlling wing profiles, as claimed in claim 1. Preferred embodiments and non-trivial variations of the present invention are the subject matter of the dependent claims.
It is intended that all enclosed claims are an integral part of the present description.
It will be immediately obvious that numerous variations and modifications (for example related to shape, sizes, arrangements and parts with equivalent functionality) can be made to what is described, without departing from the scope of the invention, as appears from the enclosed claims.
The present invention will be better described by some preferred embodiments thereof, provided as a non-limiting example, with reference to the enclosed drawings, in which:
- Figure 1 shows a cross-sectional view of a preferred embodiment of a rope with strands lacking an external coating;
- Figure 2 shows a cross-sectional view of a first preferred embodiment of a rope according to the present invention;
- Figure 3 shows a cross-sectional view of a variation of the rope of Figure 2; and - Figure 4 shows a cross-sectional view of a further variation of the rope of Figure 2.
The terminals of a rope 1 are respectively connected to a working load (not shown) and to a storage device (not shown) according to a tension gradient which establishes a maximum value of tension at one terminal and a minimum or null value at its opposite terminal.
Advantageously, the high-efficiency rope 1, in particular for controlling at least one wing profile according to the present invention, is composed of threads and strands 11, 21, 31 and comprises at least one substance 12, 22, 32 coating and/or impregnating such threads and strands 11, 21, 31, such substance being adapted to prevent a mutual contact between such threads and strands 11, 21, 31 and to compensate a relative elastic deformation between the threads and strands 11, 21, 31 themselves.
The rope 1 according to the present invention is preferably composed of three concentric levels 10, 20, 30 (as shown, for example, in Figure 3) .
A central thread 11 having a big diameter composes a first level 10.
First strands 21 composing a second level 20 are helically wound with a certain pitch around the first level 10.
Second strands 31 composing a third level 30 are helically wound with a certain pitch around the second level 20.
The thread 11 and the strands 21, 31 are respectively coated by such substance preferably as at least one rubbery sheath 12, 22, 32 (as shown, for example, in Figure 2) .
Moreover, it is possibile to provide that at least one sheath 41 externally coats the rope 1 composed of the three levels 10, 20, 30.
The sheath 41 adheres to the bunch of strands composing the levels 10, 20, 30 (as shown, for example, in Figure 3) .
According to a variation of the rope 1 according to the present invention, the sheath 41 can assume a shape having a wing profile (as shown, for example, in Figure 4) .
The process provides for the injection through an extruder of a rubbery substance capable of filling the interstices 13, 23, 33, 43 arranged on the levels 10, 20, 30 and adhering to the internal wall of the sheath 41 (as shown, for example, in Figures 3 and 4) . The strands can be made of metallic or plastic material, for example polyethilene . Preferably, the rubbery substance and the external coating 41 are made of at least one elastomer such as, for example, silicone.
The high efficiency rope 1 allows obtaining the stated objectives, since each strand composing the rope is elastically deformed independently, allowing the substance 12, 22, 32 to be deformed without getting in contact with the contiguous strands. The interstices 13, 23, 33, 43 are occupied by the rubbery substance, which precludes pollution of atmospheric agents and of dangerous particles, such as sand grains. The external sheath 41 further protects the rope 1 from atmospheric agents .
Moreover, the shape of a wing profile assumed by the sheath 41 drastically reduces the triggering of wind-induced vibrations.
The embodiment with a rope 1 equipped with a filling of interstices and wound by an external sheath occurs according to the known art in the field of strand-type ropes.

Claims

1. Rope (1), in particular for controlling at least one wing profile, comprising at least one thread (11) and strands (21, 31) made of metallic or plastic material, as elements supporting a tension load, characterized in that the rope (1) comprises at least one substance (12, 22, 32) coating, and preferably impregnating, said threads and strands (11, 21, 31), said substance being adapted to prevent a mutual contact between said threads and strands (11, 21, 31) and to compensate, through its own elastic deformation, a relative elastic deformation between said threads and strands (11, 21, 31), characterized in that said substance (12, 22, 32) is adapted to fill interstices (13, 23, 33, 43) between said threads and strands (11, 21, 31) making said rope (1) compact, and in that said substance (12, 22, 32) is at least one elastomer.
2. Rope (1) according to claim 1, characterized in that it comprises at least one sheath (41) adapted to coat said rope (1) .
3. Rope (1) according to claim 2, characterized in that said sheath (41) is shaped as a wing profile.
PCT/IT2014/000311 2014-01-02 2014-11-26 High efficiency rope, in particular for controlling wing profiles WO2015102028A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO2014A000001 2014-01-02
ITTO20140001 2014-01-02

Publications (1)

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WO2015102028A1 true WO2015102028A1 (en) 2015-07-09

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020128097A1 (en) * 2018-12-21 2020-06-25 Dsm Ip Assets B.V. Rope for airborne wind power generation systems

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911785A (en) 1974-01-18 1975-10-14 Wall Ind Inc Parallel yarn rope
US4085183A (en) 1975-05-05 1978-04-18 Consolidated Products Corporation Method of making a strain member for use in an electromechanical cable
US4550559A (en) 1982-09-01 1985-11-05 Cable Belt Limited Cables and process for forming cables
DE3813338A1 (en) * 1988-04-21 1989-11-02 Lachmann Hans Peter Dr Ing High tensile strength element for dynamically stressed elastic articles, production of such high tensile strength elements, and article provided with such elements
DE9015213U1 (en) * 1990-11-06 1991-01-17 Seidl, Christian, 8000 München Rope for hang gliders, paragliders or similar.
WO2009026730A1 (en) 2007-08-31 2009-03-05 Brugg Kabel Ag Tensile body for static and dynamic loads
WO2011144471A1 (en) 2010-05-20 2011-11-24 Societe De Technologie Michelin Method for the production of a three-layer metal cord of the type that is rubberised in situ
WO2013085800A1 (en) 2011-12-04 2013-06-13 Leonid Goldstein Wind power device with dynamic sail, streamlined cable or enhanced ground mechanism

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911785A (en) 1974-01-18 1975-10-14 Wall Ind Inc Parallel yarn rope
US4085183A (en) 1975-05-05 1978-04-18 Consolidated Products Corporation Method of making a strain member for use in an electromechanical cable
US4550559A (en) 1982-09-01 1985-11-05 Cable Belt Limited Cables and process for forming cables
DE3813338A1 (en) * 1988-04-21 1989-11-02 Lachmann Hans Peter Dr Ing High tensile strength element for dynamically stressed elastic articles, production of such high tensile strength elements, and article provided with such elements
DE9015213U1 (en) * 1990-11-06 1991-01-17 Seidl, Christian, 8000 München Rope for hang gliders, paragliders or similar.
WO2009026730A1 (en) 2007-08-31 2009-03-05 Brugg Kabel Ag Tensile body for static and dynamic loads
WO2011144471A1 (en) 2010-05-20 2011-11-24 Societe De Technologie Michelin Method for the production of a three-layer metal cord of the type that is rubberised in situ
WO2013085800A1 (en) 2011-12-04 2013-06-13 Leonid Goldstein Wind power device with dynamic sail, streamlined cable or enhanced ground mechanism

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MCKENNA H A ET AL: "Handbook of fibre rope technology, Formation of rope structures", 1 January 2004, HANDBOOK OF FIBRE ROPE TECHNOLOGY; [WOODHEAD PUBLISHING IN TEXTILES], CAMBRIDGE : WOODHEAD ; BOCA RATON, FLA. : CRC PRESS, PAGE(S) 77 - 80, ISBN: 978-0-8493-2588-5, XP002514795 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020128097A1 (en) * 2018-12-21 2020-06-25 Dsm Ip Assets B.V. Rope for airborne wind power generation systems

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