WO2021058815A1 - Pistolet thermique et support d'élément chauffant pour un pistolet thermique - Google Patents

Pistolet thermique et support d'élément chauffant pour un pistolet thermique Download PDF

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Publication number
WO2021058815A1
WO2021058815A1 PCT/EP2020/077062 EP2020077062W WO2021058815A1 WO 2021058815 A1 WO2021058815 A1 WO 2021058815A1 EP 2020077062 W EP2020077062 W EP 2020077062W WO 2021058815 A1 WO2021058815 A1 WO 2021058815A1
Authority
WO
WIPO (PCT)
Prior art keywords
hot air
heating means
air blower
heating
grooves
Prior art date
Application number
PCT/EP2020/077062
Other languages
German (de)
English (en)
Inventor
Heinrich Hagemeier
Frank Albri
Original Assignee
Steinel Gmbh
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 Steinel Gmbh filed Critical Steinel Gmbh
Publication of WO2021058815A1 publication Critical patent/WO2021058815A1/fr

Links

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
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/04—Hot-air producers
    • A45D20/08—Hot-air producers heated electrically
    • A45D20/10—Hand-held drying devices, e.g. air douches
    • A45D20/12—Details thereof or accessories therefor, e.g. nozzles, stands
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables
    • H05B3/565—Heating cables flat cables
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/022—Heaters specially adapted for heating gaseous material

Definitions

  • the invention relates to a hot air blower, in particular a battery-operated hot air handheld device and a heating medium carrier for a hot air blower.
  • a hot air blower also known as a heat gun or heat gun, is an electric tool that can be used to specifically heat a work area (workpiece). For this purpose, ambient air is sucked in by means of a blower device such as a fan wheel, heated by means of a heating device and then blown out through an outlet pipe onto the work area.
  • a blower device such as a fan wheel
  • the following common areas of application for hot air guns are just mentioned as examples: Removing adhesive films, welding plastics, deforming plastics, removing layers of paint or paint, especially on wood or metal, disinfecting laboratory equipment, drying objects.
  • hot air blowers are known in which electrical heating means, such as heating coils, are inserted or threaded into running hot air ducts through a heating medium carrier, so that the air flow generated by the hot air blower and flowing through the hot air ducts through the contact with the Heating means is heated.
  • electrical heating means such as heating coils
  • the heating medium carrier, the hot air ducts and the heating medium must be designed in such a way that the heat transfer between the heating medium and the air flow and the volume available for the air flow are as optimal as possible.
  • the invention is therefore based on the object of providing a hot air blower, in particular a battery-operated hand hot air blower and a heating medium carrier for a hot air blower, in which the heat transfer between the heating means and the air flow generated by the hot air blower is as optimal as possible.
  • a heating medium support for an electrically operated hot air blower having a circumferential surface stretched out in a longitudinal direction and two end faces perpendicular to the longitudinal direction.
  • the jacket surface of the heating means carrier has grooves running in the longitudinal direction from one end face to the other end face, which grooves are designed to accommodate electrical heating means for the hot air blower.
  • the heating means can be inserted lengthwise into the grooves and do not have to be threaded.
  • the air flowing along the grooves can flow unhindered around the heating means on the side of the groove openings located on the lateral surface, whereby the contact area between the heating means and the air flowing past and the entire volume flow of the air flowing through the grooves is increased.
  • a heating medium carrier for example a ceramic part or a ceramic disk for a battery-powered hot air blower
  • the hot air ducts are not closed as bores through the ceramic part, but rather run as circumferential grooves in the longitudinal direction within the ceramic part.
  • the heating means such. B. Schuwen deln longitudinally in the circumferential elongated grooves in the ceramic part and do not have to be threaded, as is the case with hot air ducts designed as a bore.
  • the jacket surface of the heating medium carrier can have a cylindrical shape.
  • a cross section of the heating medium carrier perpendicular to the longitudinal direction can have a star-shaped shape.
  • the grooves can have a W-shaped cross section, so that the bottom area of the grooves has a triangular elevation.
  • the heating means are kept at a distance from the bottom of the grooves and the contact area between the heating means and the heating means carrier is minimized, so that less heat is given off from the heating means to the heating means carrier and a higher proportion of the surface of the heating means is in contact with the air flowing past.
  • the electrical heating means can comprise a heating coil.
  • the heating coil can comprise a flat wire.
  • the flat wire can be wound with its flat side around an imaginary cylindrical surface extending in the longitudinal direction in a spiral or helical manner.
  • the largest possible surface area of the heating coil is achieved with the smallest possible cross section, so that the contact area between the heating coil and the air flowing past and the volume available for the air flow are increased at the same time.
  • this also means that less material is used for the heating means.
  • the heating means can be received in the grooves in such a way that the ends of the heating means can be electrically contacted at the same end face of the heating means carrier. This simplifies the assembly and the contacting of the heating means in the hot air blower and less material is used for electrical leads.
  • the heating means can be kept at a distance from the bottom of the grooves by a spacer.
  • the heating means carrier can be designed in such a way that a contact area between the heating means and the heating means carrier is less than 20% of the surface of the grooves. As a result, less heat is given off from the heating means to the heating means carrier and a higher proportion of the surface of the heating means is brought into contact with the air flowing past.
  • the heating medium carrier can be a ceramic body. This achieves a special heat resistance with optimal thermal properties at the same time.
  • a hot air blower with a heating medium carrier according to the invention is provided.
  • the hot air blower can comprise energy storage means which are configured to store electrical energy and to supply the hot air blower with electrical energy.
  • the energy storage means can be electrical Be accumulators. This considerably simplifies the use of the hot air blower and eliminates the need for a wired external power supply.
  • the hot air blower can be a hand-held device, in particular a hot air gun with electrical accumulators that can be fastened to the lower end of a grip area of the hot air gun, or a hot air wand.
  • the hot air blower can have a maximum power of 600 to 1200 watts.
  • the hot air blower can be set up to generate an air flow which flows through the grooves along the longitudinal direction (L) of the heating medium carrier.
  • Fig. 1 is a schematic view of a hot air blower according to egg nem embodiment of the invention
  • Fig. 2 is a schematic perspective view of the Schuffenträ gers
  • FIG. 3 shows a front view of the heating medium carrier from FIG. 2,
  • Fig. 4 is a schematic plan view of the heating means carrier with inserted heating means
  • FIG. 6 is a schematic perspective view of the flat wire.
  • FIG. 1 shows a schematic and simplified view of a hot air blower according to an exemplary embodiment of the invention.
  • the hot air blower 100 shown in Fig. 1 has an elongated alreadybil Detes housing 1 10, on which an air outlet 120 is provided for heated air at one end. This heated air is generated by a heating device 130, through which air sucked in by means of a blower device 140 is brought through an air inlet (not shown) and can exit from the air outlet 120 heated to an operating temperature of up to approx. 700 ° C.
  • the operating temperature is between 300 and 500 ° C.
  • the blower device 140 has an electric motor 150 and at least one fan wheel 160 that can be driven by the electric motor 150 to generate the air flow.
  • the electric motor 150 of the blower device 140 is designed as a brush motor.
  • a schematically shown control unit 170 effects both temperature regulation and suitable control of the heating device 130 or fan device 140.
  • the control unit 170 is electrically connected to the fan device 140 and the heating device 130.
  • the electrical energy supply of the hot air blower 100 takes place via an accumulator module 180, which can be attached or snapped into place in a known manner on the underside of a pisto-shaped handle section 190 of the hot air blower 100.
  • the accumulator module 180 has electrical energy storage means 180a, which are preferably designed as electrical accumulators 180a.
  • a lithium-ion battery which can be set up for an operating voltage of 18 volts, can be provided as the electrical accumulator 180a.
  • the electrical accumulator 180a By providing the accumulator module 180 as a power supply, a hot air blower output of the hot air blower 100 according to the invention in the range of, for example, 550 watts can be provided.
  • the hot air blower 100 thus has, for example, a wireless power supply.
  • the cordless hot air blower 100 can be designed as a battery-operated handheld device.
  • the invention should not be limited to the operation of a battery-powered hot air blower, but is used wherever an optimal heat transfer between tween the heating means and the air flow is appropriate.
  • the heating device 130 is designed to provide a constant heating power in a range between 300 watts and 1200 watts, preferably in ranges between 400 watts and 600 watts or between 800 watts and 1000 watts, and in particular special in ranges between 500 watts and 600 watts Watts or between 900 watts and 1000 watts.
  • the heating device 130 has at least one heating medium carrier 10, which is shown in a schematic perspective view in FIG. 2. In FIG. 3, a front view of the heating medium carrier from FIG. 2 is shown.
  • the heating means carrier 10 has a jacket surface 12 which is extended in a longitudinal direction L and two end surfaces 14a, 14b that are perpendicular to the longitudinal direction.
  • the jacket surface 12 of the heating medium carrier 10 has a plurality of grooves 16 which run from one end face to the other end face in the longitudinal direction (L) and are designed to accommodate electrical heating means 18 for the hot air blower 100.
  • the jacket surface 12 of the heating medium carrier can, for example, have a cylindrical shape.
  • the heating medium carrier can be a ceramic body.
  • the grooves 16 are designed in such a way that the cross section of the heating medium carrier 10 has a star-shaped shape perpendicular to the longitudinal direction L.
  • the cross section of the heating medium carrier 10 has a circular inner section 20 with the inner radius r, as well as several T-shaped projections 22 protruding outward from the inner section 20 in the radial direction, the T-shaped projections 22 extending up to one Outer radius R extend. Between the T-shaped projections there are smaller triangular or pointed projections 24 or elevations 24 protruding outwardly from the inner section 20 in the radial direction.
  • the grooves 16 are thus defined by the space located between two adjacent T-shaped projections 22 and have a W-shaped cross section, so that the bottom region of the grooves 16 has a triangular elevation 24.
  • the heating means carrier 10 with the heating means 18 received is electrically and thermally isolated from the external environment by an outer shell 25.
  • the outer shell 25 is directly adjacent to the jacket surface 12 of the Schuffenträ gers 10.
  • the outer shell 25 can be a cylinder with a radius R which is expanded in the longitudinal direction L.
  • the outer shell 25 can for example consist of several layers of mica paper (Micanit).
  • the air flow LS generated by the Gebläseein device 140 flows through the grooves 16 and the Outer envelope 25 delimited hot air channels 25a in the longitudinal direction L.
  • the air stream LS flows around the heating means 18.
  • the area immediately adjacent to the outer shell 25 between the outer ends of two T-shaped projections is accessible for the air flow LS.
  • This increases the volume of air transported per unit of time, while at the same time the contact area between the heating means 18 and the air flow LS is also increased.
  • the heating means 18 are held at a distance from the bottom of the grooves 16 by three angular elevations 24 serving as spacers, so that the contact area between the heating means 18 and the heating means carrier 10 is minimized.
  • the heating means carrier 10 also has a central bore 26 running in the longitudinal direction L with a square cross section, and one or more round bores 28 running in the longitudinal direction L.
  • the hole 26 is used to fasten the heating medium carrier 10 in the housing 110.
  • the round holes are used to accommodate thermocouples (not shown) which are used for temperature measurement and are electrically connected to the control unit 170.
  • Fig. 4 shows a schematic plan view of the heating means carrier 10 with the purely schematically illustrated electrical heating means 18 received in the grooves 16.
  • the electrical heating means 18 are received in the grooves 16 in such a way that the ends of the Heating means can be electrically contacted on an identical end face 14a of the heating means carrier 10 by means of the contacts 30a, 30b.
  • the electrical heating means 18 can comprise a heating coil 32, as shown in FIG. 5 in a schematic perspective view.
  • the heating coil 32 comprises a heating wire 34, wherein the heating wire 34 can be a round wire or a wire with any other cross section.
  • the heating wire 34 can be made of a nickel-chromium alloy, for example.
  • the heating coil 32 comprises a flat wire 34, the flat wire 34 being wound with its flat side around an imaginary cylindrical surface extending in the longitudinal direction (L) in a spiral or helical manner.
  • the design of the electrical heating means 18 in the form of a heating coil 32 made of flat wire 34 as described above has several advantages. As can be seen from Fig. 3, the contact area between the heating means 18 and the heating means carrier 10 is less than 20%, or less than 15%, or less than 10%, or less than 8%, or less than 5%, or less than 1%, or less than 0.5% of the surface of the grooves 16.
  • the flat wire is spirally wound with the flat side around an imaginary cylindri cal surface extended in the longitudinal direction (L), this is both inside the imaginary cylindrical surface
  • the volume located on the surface as well as the volume located outside the imaginary cylindrical surface are accessible to the air flow LS.
  • the air flow comes into contact with the flat side surface of the flat wire both on the inside and on the outside of the imaginary cylindrical surface.
  • the direction of the air flow L is parallel (tangential) to the flat side surface of the flat wire, which also minimizes the flow resistance.
  • grooves for receiving the heating means 18 are provided in the heating means carrier 10 also result in advantages during the assembly of the heating device 130 for example in the case of a hole, be threaded or pushed through.
  • the heating means 18 is designed as a heating coil 32 made of flat wire 34, threading the heating coil 32 into a bore can be very laborious, if not impossible, while when picking up the heating coil 32 in a groove 16, possible manufacturing tolerances can be bridged without any problems.
  • the flat wire 34 is characterized in that it does not have a round cross-section, so that the following relationship (isoperimetric inequality) applies between its cross-sectional area A and its cross-sectional circumference U:
  • the quantity K can, for example, be less than 0.8, less than 0.6, less than 0.4, less than 0.2, less than 0.1, less than 0.05, less than 0.025 or less than 0.01.
  • the cross section of the flat wire 34 can, for example, have an elliptical shape with a small semiaxis a and a large semiaxis b or a rectangular shape with the sides a and b.
  • the hot air channels 25a are no longer closed as bores through the ceramic part 10, but are provided as circumferential grooves 16 in the longitudinal direction L within the ceramic part 10.
  • the heating coils 32 can be inserted longitudinally into the circumferential longitudinal grooves 16 in the ceramic part and no longer have to be threaded, as is currently the case in the prior art. Another advantage is that the air can flow unhindered in this area, less area is blocked and a higher volume flow is possible.

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  • 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)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)
  • Resistance Heating (AREA)

Abstract

L'invention concerne un support d'élément chauffant (10) pour un pistolet thermique à commande électrique. Le support d'élément chauffant (10) présente une surface latérale (12) allongée dans une direction longitudinale (L) et deux faces d'extrémité (14a, 14b) qui sont perpendiculaires à la direction longitudinale (L). La surface latérale (12) du support d'élément chauffant (10) présente des rainures (16) s'étendant dans la direction longitudinale (L) d'une face d'extrémité (14a) à l'autre face d'extrémité (14b), lesquelles rainures sont conçues pour recevoir des éléments chauffants électriques (18) pour le pistolet thermique (100).
PCT/EP2020/077062 2019-09-27 2020-09-28 Pistolet thermique et support d'élément chauffant pour un pistolet thermique WO2021058815A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019126211.9A DE102019126211A1 (de) 2019-09-27 2019-09-27 Heißluftgebläse und Heizmittelträger für ein Heißluftgebläse
DE102019126211.9 2019-09-27

Publications (1)

Publication Number Publication Date
WO2021058815A1 true WO2021058815A1 (fr) 2021-04-01

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ID=72717847

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/077062 WO2021058815A1 (fr) 2019-09-27 2020-09-28 Pistolet thermique et support d'élément chauffant pour un pistolet thermique

Country Status (2)

Country Link
DE (1) DE102019126211A1 (fr)
WO (1) WO2021058815A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7911940U1 (de) * 1979-04-24 1980-10-09 Fa. Friedrich Wuerth, 7000 Stuttgart Kalt- und/oder waermeluftgeblaese, insbesondere zum trocknen von haaren
EP0168187A1 (fr) * 1984-06-19 1986-01-15 Black & Decker Inc. Supports pour éléments de chauffage électriques et leurs procédés de fabrication
CN108826671A (zh) * 2018-04-09 2018-11-16 浙江普莱得电器有限公司 一种热风枪用发热芯及热风枪

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7911940U1 (de) * 1979-04-24 1980-10-09 Fa. Friedrich Wuerth, 7000 Stuttgart Kalt- und/oder waermeluftgeblaese, insbesondere zum trocknen von haaren
EP0168187A1 (fr) * 1984-06-19 1986-01-15 Black & Decker Inc. Supports pour éléments de chauffage électriques et leurs procédés de fabrication
CN108826671A (zh) * 2018-04-09 2018-11-16 浙江普莱得电器有限公司 一种热风枪用发热芯及热风枪

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Publication number Publication date
DE102019126211A1 (de) 2021-04-01

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