WO2014087401A1 - Enveloppe de protection thermique - Google Patents

Enveloppe de protection thermique Download PDF

Info

Publication number
WO2014087401A1
WO2014087401A1 PCT/IL2013/050991 IL2013050991W WO2014087401A1 WO 2014087401 A1 WO2014087401 A1 WO 2014087401A1 IL 2013050991 W IL2013050991 W IL 2013050991W WO 2014087401 A1 WO2014087401 A1 WO 2014087401A1
Authority
WO
WIPO (PCT)
Prior art keywords
shroud
gun
layer
outer layer
barrel
Prior art date
Application number
PCT/IL2013/050991
Other languages
English (en)
Inventor
Oz Harpaz
Original Assignee
D.G.L. Us Ltd.
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 D.G.L. Us Ltd. filed Critical D.G.L. Us Ltd.
Publication of WO2014087401A1 publication Critical patent/WO2014087401A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/44—Insulation jackets; Protective jackets

Definitions

  • the presently disclosed subject matter relates to a thermal protection shroud in general, and in particular to a shroud for thermally protecting a gun barrel, such as a tank or a cannon gun.
  • Uneven heat on the upper and lower part of the barrel caused by uneven sun radiation or uneven cooling of the barrel by rain, may cause the barrel to bend up or down and affect the accuracy of thereof.
  • the presently disclosed subject matter provides a thermal protecting shroud for thermal insulation of a gun of a tank.
  • the shroud includes a sleeve having a rigid wall portion configured to be mounted on the gun such that the rigid wall portion surrounds at least the majority of the circumference of at least a portion of the gun.
  • the shroud further includes an insulating system configured for reducing thermal signature of an object, the insulating system is coupled to an inner surface of the rigid wall portion, wherein at least the majority of the insulation system is fiber.
  • the insulating system can include an outer layer, and an inner fabric layer having a three-dimensional decoupling fabric for preventing heat transmission from the outer layer to the gun allowing air to circulate between the gun and the outer layer.
  • the outer layer can include a plastic film coating on an outer surface thereof and an aluminum coating on an inner surface thereof layer for preventing inward heat transmission by radiation.
  • the plastic film can include a coating of carbon black on the outer surface thereof.
  • the insulating system can include an outer layer for reflecting solar radiation, and an inner fabric layer including a three-dimensional decoupling fabric for preventing heat transmission from the outer layer to the gun.
  • the insulating system can include an outer layer for reflecting solar radiation.
  • the inner fabric layer can further be configured to evenly distribute the heat on the gun.
  • the outer layer can be formed of knitted fiberglass or polyester and fiberglass.
  • the outer layer can be polyester and fiberglass knitted together for strength.
  • the plastic film can be formed of polyvinyl chloride or polyurethane and can be a 225 to 275 microns thick layer of polyvinyl chloride. More specifically the layer of polyvinyl chloride can have a thickness of 250 microns.
  • the carbon black coating can have a thickness of 40-60 microns and the aluminum coating can have a thickness of 5- 10 microns.
  • the inner fabric layer can include outer and inner polyester mesh films, and polyaramid fibers sandwiched between the polyester films.
  • the inner fabric layer can be connected to the outer layer.
  • the inner fabric layer can have a thickness of 5 to 10 mm, and specifically can have a thickness of 9.5 mm.
  • the shroud can further include a first rubber hoop coupled to the inner surface of a first end of the sleeve and a second rubber hoop coupled to the inner surface of a second end of the sleeve.
  • the first and second rubber hoops can be configured to absorb forces applied on the gun, wherein the insulating system is disposed between the first and second rubber hoops.
  • the presently disclosed subject matter further provides thermal protection shroud for thermal insulation of a gun of a tank.
  • the shroud includes a sleeve having a rigid wall portion configured to be mounted on the gun such that the rigid wall portion surrounds at least the majority of the circumference of at least a portion of the gun, and an insulating system configured to be coupled to an inner surface of the rigid wall portion.
  • the insulating system includes an outer layer, a plastic film coating on an outer surface of the fabric layer, a coating of carbon black on the outer surface of the plastic film; an aluminum coating on an inner surface of the outer layer for preventing inward heat transmission by radiation; and an inner fabric layer including a three-dimensional decoupling fabric for preventing heat transmission from the outer layer to the gun while allowing air to circulate between the gun and the outer layer.
  • the presently disclosed subject matter further provides a gun barrel for a tank or a canon.
  • the gun barrel includes a barrel, a sleeve having a rigid wall portion configured to be mounted on the barrel such that the rigid wall portion surrounds at least the majority of the circumference of at least a portion of the barrel, and an insulating system configured for reducing thermal signature of the barrel, the insulating system being disposed between an inner surface of the rigid wall portion and an outer surface of the portion of the barrel, wherein at least the majority of the insulation system is fiber.
  • the outer layer can include a plastic film coating on an outer surface thereof and an aluminum coating on an inner surface thereof layer for preventing inward heat transmission by radiation.
  • the plastic film can include a coating of carbon black on the outer surface thereof.
  • the outer layer can be formed of knitted fiberglass or polyester and fiberglass.
  • the outer layer can be polyester and fiberglass knitted together for strength.
  • Fig. 1 is a side perspective view of the thermal protecting shroud according to one example of the presently disclosed subject matter
  • Fig. 2 is an exploded view of the shroud of Fig. 1 ;
  • Fig. 3 is a side view of the shroud of Fig. 1 ;
  • Fig. 4 is a side view of the shroud of Fig. 1 ;
  • Fig. 5 is an enlarged view of the inner side of the shroud of Fig. 1 ;
  • Fig. 6 is a side view of the shroud of Fig. 1 mounted on a gun of a tank;
  • Fig. 7 is a side perspective view of a tank having a plurality of shrouds mounted thereon.
  • Fig. 1 is a side view of a thermal protection shroud 10 for mounting on a barrel of gun, such as a tank gun, and configured for thermal insulation thereof.
  • the shroud includes a sleeve 12 having a rigid wall portion 14 configured to be mounted on a barrel of a tank gun, such that the rigid wall portion surrounds the barrel.
  • the shroud further includes a fiber based insulating system 20 which is configured for reducing thermal signature of an object.
  • the insulating system is coupled to an inner surface of the rigid wall portion 14.
  • the shroud 10 can be configured to be removed from the barrel of the gun for example by forming a cylindrical wall portion 14 having a longitudinal slit 16 defined along the entire length thereof.
  • the wall portion 14 can be slightly flexible, such that two opposing ends thereof (designated as 14a and 14b) defining the slit 16 therebetween can be pushed away from one another thereby increasing the diameter of the cylindrical wall portion and allowing it to be mounted on or removed from the barrel (not shown).
  • the two ends 14a and 14b can be fastened to one another, for example by a fastening band 18 having a plurality of couplers 18a, such as screws, etc.
  • the fastening band 18 can be such which allows a quick removal of the shroud 10, for example for maintenance thereof or of the gun barrel.
  • the shroud 10 is fastened to the barrel of the gun by one or more fasteners, for example a pair of fasteners 30a and 30b each mounted on one end of the shroud.
  • the fasteners 30a and 30b can include a band 32 disposed about the outer periphery of the rigid wall portion 14 and a fastening mechanism 34 for fastening the ends of the band.
  • the fastening mechanism 34 can be for example hinge handle fastener, configured for quick fastening and unfastening of the band and the shroud 10.
  • a rubber hoop 40 can be provided between the inner surface of the sleeve and the barrel for absorbing forces applied on the gun.
  • the rubber hoop 40 can be disposed at each end of the rigid wall portion 14a and 14b for example beneath the fastener 30a and 30b respectively.
  • the insulating system 20 coupled to the inner surface of the rigid wall portion 14 extends between the first and the second rubber hoops 40, such that the rubber hoops engage the inner surface of the rigid wall portion directly.
  • the rubber hoop 40 can be in a shape of a band having a top portion 42 adapted to increase the engagement thereof with the inner surface of the rigid wall portion 14.
  • the top portion 42 can include two circumferential rims 44 one at each side thereof, defining a depression 46 therebetween.
  • the rims 44 is such that when the fasteners 30a and 30b are closed the rubber hoops 40 are pressed between the barrel and the inner surface of the rigid wall portion 14, the depression 46 is pressed against the inner surface of the wall portion, pushing the rims 44 sidewardly, thus increasing the engagement between the rigid wall portion 14 and the rubber hoop 40.
  • the uneven engagements of the inner surface of the rigid wall portion 14 and the rubber hoop 40 provide additional stability to the shroud 10, specifically against horizontal forces applied on the gun barrel, for example forces exerted during firing.
  • the rubber hoops 40 can further include a stop rim 48, defined on one of the circumferential rims 44.
  • the rubber hoop 40 can be disposed at the end of the rigid wall portion 14a or 14b, such that the stop rim 48 is disposed outside the wall portion 14.
  • the stop rim 48 is configured to abut against the edge of the wall portion 14, such that when the fasteners 30a and 30b fasten the wall portion to the barrel, the stop rim 48 protrudes outside the wall portion. This way the stop rim 48 serves as a stop member further precluding displacement of the shroud 10.
  • the insulating system 20 can be made of a thermal camouflage material having a plurality of layers configured for reducing thermal signature of an object.
  • the insulating system can include an outer layer for absorbing and reflecting layer for absorbing and reflecting heat from solar radiation and an insulating layer for preventing the heat in the absorbing and reflecting layer to reach the barrel.
  • the system of Dumas includes an outer layer, and an inner fabric layer.
  • outer layer is a layer of the insulating system 20 which is adjacent the inners surface of the rigid wall portion 14, and "inner fabric layer” is a layer which is adjacent the tank barrel when the shroud is mounted thereon.
  • the outer layer includes a plastic film coating on an outer surface thereof and a coating of carbon black on the outer surface of the plastic film.
  • the outer layer includes an aluminum coating on an inner surface thereof for preventing inward heat transmission by radiation.
  • the inner fabric layer includes a three-dimensional decoupling fabric for preventing heat transmission from the outer layer to the gun, while allowing air to circulate between the gun and the outer layer. This way the insulating material 20, can reflect the solar radiation impinging on the shroud 10 while being thermally insulated from the barrel itself.
  • the insulating material 20 reduces heat conduction to the barrel and provides an air space between the barrel and the outer surface or layer of the insulating material reducing the heat reaching the barrel.
  • the insulating material 20 can be further configured substantially evenly distributes the heat reaching the barrel from the solar radiation impinging on the shroud, thereby precluding deformation of portions of the barrel.
  • the insulating system 20 is coupled to the inner surface the rigid wall portion 14, for example with an adhesive material. It is appreciated that in order to retain the insulating system 20 in place, the adhesive material can be configured to overcome the difference between the thermal expansion of the rigid wall portion 14 and that of the barrel, for example due to a different coefficient of thermal expansion, or due to different exposure to solar radiation. Alternatively, the insulating system 20 can be coupled to the rigid wall portion 14 in any other suitable manner, for example by pressing the rigid wall portion 14 toward the barrel while the insulating system is disposed therewetween.
  • the outer layer can be formed of knitted fiberglass or polyester and fiberglass which are knitted together for high strength. When 100% fiberglass is used, it is preferably G19P33 industrial knitted fiberglass (20.times.14 pick/sqin) available form Amatex, Norristown, Pa.
  • the outer surface of the outer layer can be coated with a film of polyvinyl chloride (PVC) or polyurethane (PU).
  • PVC polyvinyl chloride
  • PU polyurethane
  • the film can be coated with carbon black to increase solar loading on the outer layer.
  • the carbon black applied to the film is the main provider of thermal insulation for the material. When PVC is used, the film is 225 to 275 and preferably 250 microns thick, and the carbon black is 40-60 and preferably 50 microns thick.
  • An aluminum coating can be applied to the inner surface of the outer layer by vapor deposition.
  • the coating can be 5- 10 microns thick and faces the inner side of the material which is against the heat source when mounted thereon.
  • the aluminum coating prevents inward heat transmission by radiation.
  • the aluminum increases the effectiveness of the film coated with carbon black, because radiated heat is reflected outwardly or held in the outer layer more effectively. Most radiated heat is absorbed by the PVC or PU treated with carbon black or reflected by the aluminum coating.
  • the inner fabric layer in order to reduce heat transmission by direct contact (conduction), can be defined by a 3-dimensional decoupling fabric layer.
  • the decoupling fabric layer is attached to the aluminum side of the outer layer by stitching (not shown).
  • the inner fabric layer can include outer and inner polyester mesh films 22, respectively with polyaramid fibers sandwiched therebetween.
  • An effective thickness of the inner fabric layer can be 5 to 10 mm, and preferably approximately 9.5 mm (3/8 inch).
  • the inner fabric layer allows air to circulate between the outer layer and the barrel of the tank gun.
  • the outer layer can be formed without the aluminum coating, in this case the outer layer is configured to absorb the solar heat and the inner layer is configured to insulate between the barrel and the hot outer layer.
  • the inner fabric layer is further configured to evenly distribute the heat from the outer layer on the surface of the barrel, thereby precluding deformation thereof.
  • the outer layer includes an aluminum sheet attached to the inner fabric layer.
  • Solar radiation for example in the form of IR radiation is transferred through the rigid wall portion 14 and is reflected by the aluminum sheet back to the inner surface of the rigid wall portion and outside to the ambient. Heat which is conducted by the aluminum sheet into the inner fabric layer, is homogenously distributed inside the inner fabric layer.
  • the shroud 10 can be mounted on a gun barrel 50 of a tank in a manner which allows removal thereof, for instance in order to maintain the barrel or the shroud. This can be carried out by utilizing the fasteners 30a and 30b as described herein above.
  • the shroud can be configured to be mounted only on a portion of the length of the barrel 50.
  • the shroud 10 can include four units 10a, 10b, 10c, and lOd, each provided with a rigid wall portion 14 and a pair of fasteners 30a and 30b.
  • each unit 10a, 10b, 10c, and lOd can have a gradually changing inner diameter, and can be such that the inner diameter of the different units gradually increases from one another.
  • shroud 10 does not have to be mounted on the entire length of the barrel 50, rather it can be mounted on a portion or portions thereof which are likely to be effected by the heat generated from solar radiation.
  • shroud 10 surrounds the entire circumference of the barrel 50 it can be alternatively configured to surround only a portion thereof, for example the majority of the circumference.
  • the units 10a, 10b, 10c, and lOd can be mounted over the rubber bands.
  • the rubber hoop 40 provided with each of the shroud units can be configured to be disposed on top of the rubber member seated in the groove. This way the tight engagement between the inner surface of the rubber hoop 40 and the outer surface of the rubber member provides additional stability to the shroud 10, and preclude horizontal displacements thereof.
  • the length of each unit 10a, 10b, 10c, and lOd is adapted such that the two rubber bands 40 thereof correspond to two grooves and rubber members on the barrel 50.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne une enveloppe de protection thermique destinée à un canon de char. Cette enveloppe comprend un manchon pourvu d'une partie paroi rigide configurée pour être montée sur le canon de sorte à entourer au moins la plus grande partie de la circonférence d'au moins une partie du canon. L'enveloppe selon l'invention comprend également un système isolant configuré pour réduire la signature thermique d'un objet, ce système isolant étant couplé à la surface interne de la partie paroi rigide, la plus grande partie au moins dudit système étant constituée de fibres.
PCT/IL2013/050991 2012-12-09 2013-12-03 Enveloppe de protection thermique WO2014087401A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL22350612 2012-12-09
IL223506 2012-12-09

Publications (1)

Publication Number Publication Date
WO2014087401A1 true WO2014087401A1 (fr) 2014-06-12

Family

ID=50882889

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2013/050991 WO2014087401A1 (fr) 2012-12-09 2013-12-03 Enveloppe de protection thermique

Country Status (1)

Country Link
WO (1) WO2014087401A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017095814A1 (fr) * 2015-12-01 2017-06-08 Magpul Industries Corp. Ensemble couvercle de silencieux et procédé associé
US10712114B2 (en) 2015-12-01 2020-07-14 Magpul Industries Corp. Suppressor cover assembly and method
WO2022079641A1 (fr) * 2020-10-15 2022-04-21 Battle Born Supply Co. Dispositif de protection thermique

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346643A (en) * 1979-12-07 1982-08-31 Hughes Aircraft Company Thermal jacket for elongated structures
EP0033770B1 (fr) * 1980-02-12 1984-02-15 Rheinmetall GmbH Enveloppe de protection pour un tube de canon
US4638713A (en) * 1984-11-26 1987-01-27 Vickers Public Limited Company Thermal sleeve for gun barrels
US4762048A (en) * 1985-10-11 1988-08-09 Fuji Electric Co., Ltd. Apparatus for uniforming heat of gun barrel
US4841836A (en) * 1987-11-02 1989-06-27 Bundy Mark L Thermal shroud for a gun tube
IL113678A (en) * 1994-06-16 1998-02-22 Giat Ind Sa Anti-curvature adapter for cannon barrel
US20090104419A1 (en) * 2007-10-22 2009-04-23 Jean Dumas Desert camouflage
US20110100204A1 (en) * 2007-11-09 2011-05-05 Gert Schlenkert Thermal insulation jacket for a gun barrel

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4346643A (en) * 1979-12-07 1982-08-31 Hughes Aircraft Company Thermal jacket for elongated structures
EP0033770B1 (fr) * 1980-02-12 1984-02-15 Rheinmetall GmbH Enveloppe de protection pour un tube de canon
US4638713A (en) * 1984-11-26 1987-01-27 Vickers Public Limited Company Thermal sleeve for gun barrels
US4762048A (en) * 1985-10-11 1988-08-09 Fuji Electric Co., Ltd. Apparatus for uniforming heat of gun barrel
US4841836A (en) * 1987-11-02 1989-06-27 Bundy Mark L Thermal shroud for a gun tube
IL113678A (en) * 1994-06-16 1998-02-22 Giat Ind Sa Anti-curvature adapter for cannon barrel
US20090104419A1 (en) * 2007-10-22 2009-04-23 Jean Dumas Desert camouflage
US20110100204A1 (en) * 2007-11-09 2011-05-05 Gert Schlenkert Thermal insulation jacket for a gun barrel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017095814A1 (fr) * 2015-12-01 2017-06-08 Magpul Industries Corp. Ensemble couvercle de silencieux et procédé associé
AU2016351310B2 (en) * 2015-12-01 2017-08-17 Magpul Industries Corp. Suppressor cover assembly and method
US10036606B2 (en) 2015-12-01 2018-07-31 Magpul Industries Corp. Suppressor cover assembly and method
US10712114B2 (en) 2015-12-01 2020-07-14 Magpul Industries Corp. Suppressor cover assembly and method
WO2022079641A1 (fr) * 2020-10-15 2022-04-21 Battle Born Supply Co. Dispositif de protection thermique
US11555664B2 (en) 2020-10-15 2023-01-17 Battle Born Supply Co. Heat protective device

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