Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
  • F24H3/00—Air heaters
  • F24H3/02—Air heaters with forced circulation
  • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
  • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
  • F24H3/0423—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between hand-held air guns
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
  • F24H3/00—Air heaters
  • F24H3/02—Air heaters with forced circulation
  • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element

Definitions

• the present invention relates to a hot air generating tool.
• Background Art Drying machines for example of the infrared type, are currently known for the industrial drying of one or more painted bodies, for example a component of a vehicle body or an entire vehicle body, for example of a car, and are inherently expensive in themselves and also in terms of management and maintenance.
• these industrial solutions are inherently unfeasible, and a person who has painted one or more bodies or surfaces, for example by means of an airbrush or a paint gun to be associated with an air compressor, must allow the painted bodies to dry in the air by natural convection, or use an ordinary hairdryer, improperly consuming electric power and risking desiccation of the painted surface. Disclosure of the Invention
• the aim of the present invention is to provide a tool which generates hot air by using compressed air and can be connected easily to a compressor of a known type.
• an object of the present invention is to provide a tool which is easy to provide and use and is also cheap.
• a hot air generating tool which can be manufactured with known systems and technologies.
• a hot air generating tool comprising a tubular body for aspirating and discharging drying air, with which means for heating said air and a handle are associated, characterized in that said air heating means are constituted by a Ranque-Hilsch vortex tube device supplied with compressed air.
• Figure l is a sectional view of a tool according to the invention
• Figure 2 is a perspective view of a use of the tool according to the invention
• Figure 3 is a schematic sectional view of the operation of the vortex tube device which is a part of the tool according to the invention. Ways of carrying out the Invention
• a hot air generating tool is generally designated by the reference numeral 10.
• the hot air generating tool 10 comprises a tubular body 1 1 for aspirating and discharging drying air, with which means for heating the air and a handle 12 are associated.
• the air heating means are constituted by a Ranque-Hilsch vortex tube device 13, which is supplied with compressed air.
• the Ranque-Hilsch vortex tube device 13 which is of a per se known type, is integrated in the handle 12.
• the vortex tube device 13 comprises a cylindrical chamber 14 in which compressed air is injected in a radial direction from a lateral port 15, such air arriving from a compressor of a known type, which is not illustrated for the sake of simplicity.
• a first tubular cylindrical element 16 for feeding hot air toward the tubular body 1 1 protrudes from the chamber 14, coaxially thereto, at one end, and a second tubular element 17, which is shorter than the first element 16, for discharging cold air protrudes from the opposite side.
• a valve 18 for adjusting the flow-rate of compressed hot air is provided at the end of the first tube 16.
• the first tube 16 passes through the handle 12 and leads into the tubular body 11 for aspirating and discharging air, while the second tube 17 expels the cold air into the environment, or as an alternative into a disposal tube designed to move the cold air flow away from the user.
• the handle 12 is also designed to protect the user against the cold that exits from the second tube 17 and from the heat emitted by the first tube 16.
• the tubular body 11 comprises: a first central part 20, with which the handle 12 is rigidly coupled; a second intake part 21, with a frustum-shaped internal surface 22 which tapers toward the inside of the tubular body 1 1 and a debris retention grille 23; a third emission part 24, with an outer diverging portion 25 to provide a Venturi effect.
• the third part 24 is screwed to the first part 20 by means of two corresponding threaded portions, an internal thread 26 on the first part 20 and a complementary external thread 27 on the third part 24, in order to adjust the temperature by increasing or decreasing the Venturi effect.
• the pressurized hot air stream that exits from the first tube 16 is throttled, thereby modifying the temperature of the air that exits from the tubular body 11 , as shown by way of example in Figure 3.
• the vortex tube device 13, as mentioned, is of a per se known type, and is used generally in a wide range of applications in the localized cooling of machines, assembly lines and industrial processes.
• the generated hot air of the tube device 13 is used instead of the cold air.
• the operating principle of the tube device 13 is as follows.
• the compressed air is injected radially into the chamber 14, where a vortex is generated; such vortex produces the dynamic separation or extraction of molecules with high kinetic energy (i.e., at high temperature) from molecules with lower kinetic energy (and therefore at a lower temperature).
• a vortex produces the dynamic separation or extraction of molecules with high kinetic energy (i.e., at high temperature) from molecules with lower kinetic energy (and therefore at a lower temperature).
• two separate air streams, a hot one and a very cold one are generated starting from a flow of compressed air.
• Part of the hot air (which therefore moves at a higher speed than the cold air) is made to exit from the first tube by means of a conical end nozzle, shown schematically in Figure 3 and designated therein by the reference numeral 30, and an adjustment valve 18; the conical nozzle 30 allows the outflow of the hot outer stream 31 and diverts in the opposite direction the cold inner stream 32.
• the cold inner stream 32 is thus forced in countercurrent at the opposite end toward the chamber 14 and from there toward the second tube 17.
• the pressurized hot air that exits from the first tube 16 can reach HO 0 C.
• the control valve 18 located in the end of the first tube 16 allows to adjust the temperature and quantity of the air.
• the present invention provides a tool for generating hot air by using compressed air which can be connected easily to known types of compressor, so as to utilize the characteristics of the Ranque-Hilsch tube device.
• the present invention provides a tool which is easy to provide and use, as well as cheap, also in that it does not use electric power directly, except for the power needed to ran the compressor. Further, the tool is lightweight and has no moving parts, and is therefore scarcely demanding to handle for a user who has to hold it for a long period of time.
• the invention provides a drying tool which can be purchased and managed easily even by a private individual for hobby-related purposes and can also be used at an industrial level by appropriately adapting its dimensions.
• the present invention provides a tool for generating hot air which can be manufactured with known systems and technologies.
• the materials employed may be any according to requirements and to the state of the art.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Nozzles (AREA)
• Thermotherapy And Cooling Therapy Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (4)

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Family Cites Families (5)

• 2007
  • 2007-05-23 IT IT000182A patent/ITPD20070182A1/it unknown
• 2008
  • 2008-05-13 EP EP08750258A patent/EP2147258A2/en not_active Withdrawn
  • 2008-05-13 US US12/451,417 patent/US20100122541A1/en not_active Abandoned
  • 2008-05-13 WO PCT/EP2008/055824 patent/WO2008141974A2/en not_active Ceased

Non-Patent Citations (1)

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