EP1371302B1 - Vorrichtung zur Erzeugung eines temperierten Luftstroms - Google Patents

Vorrichtung zur Erzeugung eines temperierten Luftstroms Download PDF

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Publication number
EP1371302B1
EP1371302B1 EP03012708A EP03012708A EP1371302B1 EP 1371302 B1 EP1371302 B1 EP 1371302B1 EP 03012708 A EP03012708 A EP 03012708A EP 03012708 A EP03012708 A EP 03012708A EP 1371302 B1 EP1371302 B1 EP 1371302B1
Authority
EP
European Patent Office
Prior art keywords
air flow
cold air
mixing chamber
heater
air duct
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP03012708A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1371302A1 (de
Inventor
Bernd Dr. Fränzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete 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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1371302A1 publication Critical patent/EP1371302A1/de
Application granted granted Critical
Publication of EP1371302B1 publication Critical patent/EP1371302B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K10/00—Body-drying implements; Toilet paper; Holders therefor
    • A47K10/48—Drying by means of hot air

Definitions

  • the invention relates to a device for generating a temperature-controlled air flow.
  • stepless temperature adjustment of an air flow is off of US 4,316,077.
  • the one to be heated Air flow has pivotally arranged heater.
  • the heating of the Air flow through the heater depends on the angle that the heater encloses with the flow direction of the air flow, so that the temperature of the air flow can be varied by pivoting the heater.
  • DE 15 32 897 A discloses a hair dryer. having a tool carrier for inserting a tool. On the tool carrier An air flow, consisting of a central air flow of high temperature and a the low-temperature air stream surrounding the central airflow.
  • DE 81 05 442 U1 discloses a hair dryer with an air outlet channel for warm air and an additional cold air nozzle.
  • the cold air nozzle gets air out of the upstream area supplied to the heating element, wherein the air supply line by means of a closing means can be interrupted.
  • DE 44 46 188 C1 discloses a hot air gun with a Main air duct, in which a heating element for generating a hot air flow is arranged is, and a secondary air duct for generating a cold air flow.
  • the flow cross section the secondary air duct is by means of an adjusting, for example a swiveling flap, changeable.
  • the secondary air duct branches upstream of the heating element from the main air duct and opens separately from the main air duct into the open air.
  • a hair dryer which has a hot air duct for guiding a with a heater arranged therein heated air flow and a cold air duct for guiding air to ambient temperature.
  • a heater Upstream a heater is a first flap for controlling the blower generated Air flow, which can be selectively introduced into the two air ducts arranged.
  • a second flap By means of a second flap, the air flow of the hot air duct can be deflected so be that it does not emanate to the user's head. This allows for cold air operation the residual heat of the heater are dissipated.
  • From DE 29 00 983 C2 is a hair dryer with an air outlet channel known in the longitudinal direction in a Warm air duct, which has an air heater, and a cold air duct is divided.
  • a guide flap formed closure element can optionally be the inlet opening the hot air duct or the cold air duct are closed, so that in one Blower chamber generated air flow either in the hot air duct or in the cold air duct is directed. This allows fast switching between a warm air flow and a cold air flow be switched.
  • DE 23 39 706 A discloses a hair dryer hood, in which the displaced by a fan air can be passed through a hot air duct, in a heating element is arranged, or by a short-circuit channel without heating element. With the aid of a shut-off element, openings in the warm air duct and in the short-circuit channel can be made more or less closed and thereby the air flows be influenced by the individual channels. The cold and the warm airflow can subsequently mixed.
  • the invention is based on the object, the generation of an air flow adjustable Allow temperature with the least possible effort.
  • the device according to the invention for producing a tempered air flow has a blower device for generating the air flow, a heater for heating of the air flow and a hot air duct for guiding the air flow.
  • a blower device for generating the air flow for heating of the air flow
  • a hot air duct for guiding the air flow.
  • the Warm air duct is formed downstream of the heater as a mixing chamber for mixing a cold air stream, which was not heated by the heater, with the heated by the heater air flow.
  • a metering device for Varying the cold air flow provided.
  • the metering device is a tubular closure element formed in the area of the mixing chamber inside or outside of the Side wall of the hot air duct is present and displaceable relative to the side wall or is rotatable. This has the advantage that only a very small installation space for the metering device to reserve.
  • the device according to the invention has the advantage that with simple means a steady temperature adjustment of the air flow is possible.
  • At least one air guide element for promoting the mixing the cold air flow and heated with the heater air flow be. This has the advantage that a relative to the temperature distribution relatively homogeneous Air flow is generated.
  • the cross section of the hot air duct widens in the flow direction seen increasingly towards the mixing chamber. This can be easy on And without mechanical moving parts, a negative pressure in the mixing chamber be generated, with the aid of cold air can be promoted in the mixing chamber.
  • a cold air duct for guiding the Provided cold air flow, which branches off from the hot air duct upstream of the heater and flows into the mixing chamber.
  • the cold air duct encloses the hot air duct in areas. This has the advantage that the hot air duct in the enclosed area is shielded to the outside and thus the temperature of the externally accessible components the device according to the invention can be kept relatively low.
  • a further variant of the device according to the invention is an inflow opening provided, through which the cold air flow from the environment flows into the mixing chamber.
  • This variant can be designed to be particularly compact and inexpensive because the cold air duct is eliminated.
  • the metering device can be designed as a pivotable flap whose angle of attack is variable relative to the flow direction of the cold air flow, so that the cold air flow depends on the angle of attack.
  • the metering device as a in the flow path the cold air flow pivotable or displaceable closure body formed be. In this embodiment, the cold air flow depends on how far the closure body immersed in the flow path.
  • the metering device as be formed two mutually rotatable discs or rotating body, the ever Have at least one passage, wherein the cold air flow of each set Overlap of the passages depends.
  • the metering device can also be formed as two mutually displaceable hollow body, of which at least one has a passage. With the other hollow body, the passage closed and so the cold air flow can be influenced.
  • the side wall the hot air duct in the preferred embodiment in the region of the mixing chamber at least one passage.
  • the device according to the invention In order to be able to cover the largest possible temperature range with the air flow, it may be advantageous to design the device according to the invention such that the Delivery rate of the blower device is gradually varied. Corresponding leaves can be achieved in that the heating power of the heater gradually variable is.
  • FIG. 1 shows a schematic diagram of the structure of a first variant of the invention Device for generating a temperature-controlled air flow.
  • the individual functional elements are each shown only symbolically.
  • the device has a warm air duct 1, which at one end through an inflow opening 2 and at its the other end an outflow opening 3 is limited.
  • Near the inlet opening 2 is located in the hot air duct 1, a fan 4 for generating an air flow, whose Flow behavior is indicated by arrows.
  • a Heating element 5 is arranged for heating the air flow. Between the blower 4 and the heating element 5 branches off a cold air duct 6 from the hot air duct 1 and opens upstream of the heating element 5 back into the hot air duct 1.
  • the hot air duct 1 as a Mixing chamber 8 is formed and has air guide elements 9 to promote mixing of hot air and cold air flow.
  • the blower 4 sucks in air from the environment via the inlet opening 2 and sets an air flow in the direction of discharge opening 3 in progress. Part of the airflow happens the heating element 5 and is heated. Another part of the airflow is in the Cold air duct 6 is guided around the heating element 5 and maintains its temperature essentially at.
  • the mixing chamber 8 the two partial air streams are brought together again, wherein the mixing is promoted by the air guide elements 9, so that sets a mixing temperature between the temperatures of the two Partial air flows is.
  • the mixing temperature can vary over the mixing ratio the hot air flow and the cold air flow are influenced, so that by varying the cold air flow by means of the metering device 7 ultimately the temperature of so generated air flow can be adjusted.
  • the way you want it tempered air flow finally passes through the outflow opening 3 of the hot air duct. 1 off and can be supplied to the desired application.
  • Figure 2 shows a schematic diagram of the structure of a second variant of the invention Contraption.
  • the device according to the invention has the warm air duct 1 with the inflow opening 2, the outflow opening 3, the blower 4 and the heating element 5.
  • a special feature the second variant is that downstream of the heating element 5 of the Cross-section of the hot air duct 1 to the mixing chamber 8 expands.
  • Another special feature is that the mixing chamber 8, in turn, the air guide elements. 9 are arranged, connected via the metering device 7 with a further inflow opening 10 is, through which air from the environment can flow.
  • the second variant differs in part considerably from the first variant.
  • the second variant also works with the help of the blower 4 and the heating element 5 in the warm air duct 1 generates a stream of hot air.
  • the cold air supply in contrast to the first variant by sucking cold air from the Surroundings. Due to the extension of the cross section of the hot air duct 1 is formed in the Area of the mixing chamber 8, a negative pressure, with the help of cold air over the other Inlet opening 10 sucked from the environment and through the metering device 7th is conveyed through into the mixing chamber 8, where it mixes with the stream of hot air.
  • the strength of the cold air flow and thus the mixing temperature is with the Controlled metering 7.
  • first and the second variant for example by in the second variant to the further inflow opening 10 a Cold air duct 6 according to the first variant connects.
  • FIG. 3 shows a preferred embodiment of the first variant of the invention Device in a schematic sectional view.
  • the fan 4 and the Heating element 5 are shown only symbolically in this illustration.
  • the hot air duct 1 is cylindrical and over a wide range of its axial extent concentric from the likewise cylindrical surrounded trained cold air duct 6. In this way, the temperature can be the externally accessible parts are kept relatively low.
  • Around Mixing chamber 8 is the side wall of the hot air duct 1 in one or more sections broken through its scope, d. H. there is at least one passage 11, can pass through the cold air from the cold air duct 6 into the mixing chamber 8. Of the Passage 11 can by means of a cylindrical closure element 12, the outside of the Side wall of the hot air duct 1 is applied, closed.
  • the closure element 12 pivotally mounted on the side wall of the hot air duct 1 and has at least one passage 13, which by pivoting the closure element 12 more or less strongly with the at least one passage 11 in the side wall of the hot air duct 1 can be made to coincide, so that the flow cross-section can be varied for the cold air.
  • the structure and functioning of the closure element 12 will be explained in detail with reference to FIGS. 4, 5 and 6, showing the closure element 12 in different pivotal positions.
  • Figure 4 shows the hot air duct 1 with attached closure element 12 schematically in cross section. The section was taken along the line AA drawn in FIG.
  • the side wall of the hot air duct 1 has a passage 11 which extends nearly over half the circumference. Of the Passage 13 in the closure element 12 is formed accordingly.
  • the passages 11 and 13 overlap about halfway, d. H. It is about half of the maximum possible flow cross section released for the inflow of cold air into the mixing chamber 8.
  • FIG. 5 shows the closure element 12 in otherwise identical representation as FIG another pivotal position, in which there is no overlap of the passage 13 in Closure element 12 with the passage 11 in the side wall of the hot air duct first comes. Consequently, the cold air can not flow into the mixing chamber 8 and the temperature reduce the warm air flow.
  • the out of the outflow opening 3 of the hot air duct 1 exiting air flow has its maximum adjustable temperature.
  • FIG. 6 shows in a representation corresponding to FIGS. 4 and 5 Closure element 12 in the fully open position, d. H. the closure element 12 is pivoted so that the passage 13 of the closure element 12 with a maximum the passage 11 in the side wall of the hot air duct 1 overlaps. It is thus the maximum possible flow cross-section for the inflow of cold air into the mixing chamber 8 released, which in turn to the minimum adjustable temperature of the the outflow opening 3 of the hot air duct 1 exiting air flow leads.
  • any intermediate positions are possible, so that the temperature of the Air flow can be adjusted continuously.
  • the setting will not work with one figuratively illustrated adjusting lever or adjusting wheel or with a similar adjusting mechanism performed. If so desired, with the adjustment mechanism also a stepped adjustment can be realized.
  • With regard to the arrangement of the closure element 12 is also a modification possible in which the closure element 12th inside abuts the side wall of the hot air duct 1.
  • An example of another Geometry is shown in FIG.
  • FIG. 7 shows in the same representation as used in FIGS. 4, 5 and 6 was another embodiment of the formation of the passages 11 and 13 in the side wall of the hot air duct 1 and in the closure element 12.
  • two passages 11 and two passages 13 are provided, each are arranged diametrically opposite to the circumference.
  • This embodiment of the passages 11 and 13 has the consequence that the cold air flow better over the circumference of the cold air duct 6 and thus the temperature of the externally accessible parts especially can be kept low.
  • the temperature setting is not quite so sensitive as in the embodiment according to Figures 4, 5 and 6.
  • Depending on the application can also be provided more passages 11 and 13.
  • the closure element 12 is not pivotable, but slidably disposed on the side wall of the hot air duct 1.
  • the passages 11 and 13 in the side wall of the hot air duct 1 and in the closure element 12th are then by axial displacement of the closure element 12 more or less strongly brought to cover and so varies the flow area.
  • this embodiment is practically the entire scope for the training of Passages 11 and 13 are available.
  • the closure element 12 can not only for adjusting the Naturalströmqueritess between the cold air duct 6 and the mixing chamber 8 are used, but also in cases where no cold air duct 6 is present and the mixing chamber 8 instead 10 cold air from the environment is supplied via the further inflow opening. In these Cases is varied with the closure element 12 of the inflow.
  • metering 7 be used instead of the closure element 12 used in the preferred embodiment.
  • the individual embodiments of the metering device 7 respectively for influencing the through the cold air duct 6 in the Mixing chamber 8 flowing air flow as well as from the environment in the mixing chamber 8 flowing air flow can be used.
  • the following embodiments for the metering device 7 are therefore each only on the basis of a mounting situation described in the cold air duct 6.
  • Figure 8 shows the cold air duct 6 with a pivotable flap 14 schematically in Longitudinal cut.
  • the flap 14 is pivotable about an axis lying in its plane and completely closes the cold air duct 6 when it is in a position perpendicular to the longitudinal axis of the cold air duct 6 assumes. In a position parallel to the longitudinal axis gives the Damper 14, however, the cold air duct 6 completely free, so that the maximum flow cross-section is available.
  • FIG 9 shows a modification of the embodiment of Figure 8 in the same representation. Similar to a blind, the flap 14 is in this modification in individual slats 15 divided, which are each pivotable about its longitudinal axis. This is the pivoting movement not so bulky, so less space is needed. The single ones Slats 15 are usually pivoted synchronously.
  • FIG. 10 in an illustration corresponding to FIGS. 8 and 9, an embodiment is shown shown, in which the cold air duct 6 closed by means of a slider 16 is.
  • the slider 16 is displaced linearly perpendicular to the longitudinal axis of the cold air duct 6 and thereby the blocked by the slide 16 cross-sectional area of the cold air duct 6 varies.
  • a pivotable Slice inserted, which is about a pivot axis perpendicular to its main surface or more less far into the cold air duct 6 is pivoted into it.
  • several individual segments are used, for example simulate the operation of an iris diaphragm and in this way a Allow variation of the free cross section of the cold air duct 6.
  • the disc is partially perforated and around its center is rotatable relative to a second, correspondingly formed disc, so that the free cross-section of the cold air duct 6 depends on how strong the perforations of the two Disks are brought together to cover.

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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)
  • Duct Arrangements (AREA)
  • Direct Air Heating By Heater Or Combustion Gas (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Control Of Temperature (AREA)
EP03012708A 2002-06-14 2003-06-04 Vorrichtung zur Erzeugung eines temperierten Luftstroms Expired - Lifetime EP1371302B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10226658A DE10226658A1 (de) 2002-06-14 2002-06-14 Vorrichtung zur Erzeugung eines temperierten Luftstroms
DE10226658 2002-06-14

Publications (2)

Publication Number Publication Date
EP1371302A1 EP1371302A1 (de) 2003-12-17
EP1371302B1 true EP1371302B1 (de) 2005-08-17

Family

ID=29557835

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Application Number Title Priority Date Filing Date
EP03012708A Expired - Lifetime EP1371302B1 (de) 2002-06-14 2003-06-04 Vorrichtung zur Erzeugung eines temperierten Luftstroms

Country Status (4)

Country Link
EP (1) EP1371302B1 (es)
AT (1) ATE301949T1 (es)
DE (2) DE10226658A1 (es)
ES (1) ES2247454T3 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201020847D0 (en) 2010-12-08 2011-01-19 Jemella Ltd A hair dryer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1707554A (en) * 1928-02-13 1929-04-02 Halliwell Shelton Electric Cor Hair drier
US2090165A (en) * 1935-03-20 1937-08-17 Eastern Lab Inc Multiple service hair drier or the like
NL266517A (es) * 1960-07-01
GB1223107A (en) * 1967-05-09 1971-02-24 Ronson Products Ltd Improved hairdryer
WO1994023611A1 (en) * 1993-04-16 1994-10-27 Beautronix (Hong Kong) Limited Hairdryers

Also Published As

Publication number Publication date
DE50300982D1 (de) 2005-09-22
ES2247454T3 (es) 2006-03-01
EP1371302A1 (de) 2003-12-17
DE10226658A1 (de) 2005-06-30
ATE301949T1 (de) 2005-09-15

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