EP2283237A1 - Ventilateur et procédé permettant de faire fonctionner un ventilateur - Google Patents

Ventilateur et procédé permettant de faire fonctionner un ventilateur

Info

Publication number
EP2283237A1
EP2283237A1 EP09741916A EP09741916A EP2283237A1 EP 2283237 A1 EP2283237 A1 EP 2283237A1 EP 09741916 A EP09741916 A EP 09741916A EP 09741916 A EP09741916 A EP 09741916A EP 2283237 A1 EP2283237 A1 EP 2283237A1
Authority
EP
European Patent Office
Prior art keywords
fan
speed
air flow
blades
fan blades
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.)
Withdrawn
Application number
EP09741916A
Other languages
German (de)
English (en)
Inventor
Adamo Sadikovic
Stefan Richl
Bernd Altvater
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2283237A1 publication Critical patent/EP2283237A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • F04D29/305—Flexible vanes

Definitions

  • the invention relates to a fan and a method for operating a fan according to the preambles of the independent claims.
  • the fan meets with a power tool on the one hand the task of cooling the thermally loaded components in the power tool and on the other hand the task to regulate the idle speed of the engine by a corresponding idling torque.
  • a power tool on the one hand the task of cooling the thermally loaded components in the power tool and on the other hand the task to regulate the idle speed of the engine by a corresponding idling torque.
  • a power tool protected in a universal motor by an arranged on the armature shaft fan of the universal motor against uncontrolled high-speed idle.
  • a low load torque is also caused by the bearing of the armature shaft at the bearings, in comparison to the load torque through the fan, the load torque due to the storage is small.
  • an electrical appliance such as a vacuum cleaner, the airflow through the fan is used, e.g. sucked.
  • the power tool At idle, ie at high speed without removing the work on the spindle, the power tool is sufficiently supplied with cooling air. At the same time, the noise emission and the vibration load of the component structure increase due to the high speed. Disclosure of the invention
  • the invention relates to a fan, in particular a radial fan, with a fan hub and an axis of rotation, wherein a plurality of fan blades is arranged for deflecting an air flow about the axis of rotation.
  • the air flow at the fan blades can be changed both by the fan blades themselves and additionally or alternatively by corresponding installations in the fan.
  • the specific configuration of the adjusting device may be different for the first and the second alternative.
  • the fan may have forward or backward curved fan blades or also non-curved fan blades.
  • the fan in a power tool or an electrical device, such as a vacuum cleaner, used and driven by the electric motor.
  • a strong deflection of the flow in the fan and a high air mass flow causes a high torque on the motor shaft (here: electric motor). Accordingly, a low flow deflection or a lower mass air flow generates a smaller torque.
  • the flow deflection can can be varied by the fan blades itself or it can be provided additional elements which change the air flow speed dependent.
  • the flow deflection through the fan blades can be effected passively, for example, via flexurally soft regions of the fan blades and / or via an active actuating mechanism, which acts on the fan blades.
  • the flow deflection may e.g. done with fan blades, in particular with additional adjustment mechanisms in the fan blades.
  • the flow deflection may e.g. can be reached by means of flaps.
  • Motor shaft acts, which would be lower with unchanged air flow.
  • an increased ratio between flow rate and speed can be set at lower speeds for optimal cooling performance.
  • the fan blade along its longitudinal edge at least partially with the fan hub, which is also referred to as the bottom plate of the fan blades, connected and partially separated from the fan hub.
  • the fan blades can be at least partially connected and partially separated on a co-rotating fan cover disk.
  • the fan cover disk is located opposite the fan hub so that the fan blades are arranged between fan cover disk and fan hub.
  • connection of the fan blades is preferably not continuous, but at least one interruption provided.
  • the fan blade in the unconnected region may be formed more flexible than in the connected area.
  • it can also be designed completely flexible.
  • the lower blade deformation at the operating point results in less flow deflection and fan torque, and thus better overall efficiency of a power tool or electrical appliance in which the fan is located.
  • additional internals such as an active, mechanical adjustment mechanism in the power tool or electrical appliance.
  • the passive variable speed blade deformation in preferred radial fans to regulate the performance of power tools can advantageously be carried out an adaptation of the fan characteristics of the radial fan by passive blade deformation taking advantage of the fluid and centrifugal forces to optimize the performance of power tools.
  • the idling speed can be reduced and, as a result, component vibrations are reduced. It also follows an increase in Brush life in the AC range and a delay in material fatigue. Likewise, the noise emission of the preferred power tool can be reduced.
  • movable elements may be provided on the fan hub and / or the fan cover disc, which change the air flow speed dependent. This is particularly preferred in the second alternative.
  • the fan blades can be additionally adjustable or rigid.
  • These movable elements preferably flaps, can change their position depending on the centrifugal force of the fan.
  • the flaps may be an integral part of the fan or separate components that are located on the fan.
  • the design can be such that an optimal air flow is carried out with a correspondingly high air flow.
  • At higher speeds can be promoted by stronger deformation or adjustment of the flaps and correspondingly sufficient obstruction of the cross-section and / or favorable deflection of the flow a smaller air flow.
  • a device for adjusting the fan blades which is separate from the fan hub and / or the fan shroud, can be provided, for example in the manner known in exhaust gas turbochargers or in the adjustment of the rotor blades of a helicopter.
  • the fan could first be operated on the first alternative, i. with increased fan torque at high speed. In a load case (low speed), the amount of air is reduced until the engine temperature has risen so fast after a short time that more cooling air is needed. Then could be switched to the second alternative, which allows a high cooling air flow in the load case. Conveniently, then a e.g. active adjustment of the air flow to the fan blades and / or be provided on movable flaps via actuators.
  • the invention can preferably be used in radial fans or semi-axial fans, which suck in an air flow axially and deliver cooling air or radial or semi-axial.
  • the invention can also be used in axial fans, which suck in an air flow axially and deliver axially.
  • Universal motors that have a fan are used, or generally with fans, which are used for cooling of motors.
  • the invention such as the principle of passive blade deformation, can be used with suitable fan geometry advantageous in any power tool with a correspondingly high engine speed.
  • Fig. 1 a-1 c is a perspective view of a backward curved preferred
  • Fan with a plurality of fan blades (Fig. 1 a), a detailed view with internal connection of a fan blade to the fan hub (Fig. 1 b) and a detailed view with external connection of a fan blade to the
  • Fan hub ( Figure 1 c); Fig. 2a, 2b is a perspective view of a forward curved preferred
  • Fan with a plurality of fan blades with external connection to a fan hub (Fig. 2a) and a detailed view with external connection of a fan blade (Figure 2b) to a fan hub; 3a-3c show an effect of a resultant force on a backwardly curved fan blade with internal connection (FIG. 3a) and with an external connection (FIG. 3b) to a fan hub, and an effect of a force on a forwardly curved fan blade with external connection to a fan hub (Figure 3c);
  • 4a, 4b a plan view of a section of a preferred fan with movable flaps (FIG. 4a) and a side view of a movable flap at different speeds (FIG. 4b).
  • FIGS. 1 a to 1 c and 2 a, 2 b show a fan 10 with a fan hub 18.
  • a plurality of fan blades 12 for deflecting an air flow are arranged on the fan hub 18 about an axis of rotation 14.
  • the inflow direction of the air flow is in the axial direction in the center region 16 of the fan hub 18.
  • a shaft, not shown, is arranged in the center of the center region 16.
  • no cover plate is shown, as this would cover the fan blades 12.
  • Such a fan cover disc is known in various designs, for example with or without exit-side deflection of the flow in the peripheral region of the cover plate.
  • the cover plate can also be firmly connected to the fan blades 12 and rotate with it.
  • the fan blades 12 can also be connected in their longitudinal extent completely to the cover plate and only partially to the fan hub 18, so that they project radially beyond the fan hub 18.
  • FIGS. 1a to 1c show backward-curved fan blades 12, while forwardly curved fan blades 12 are shown in FIGS. 2a, 2b.
  • the direction of rotation is directed by way of example in a clockwise direction.
  • the fan blades 12 may be connected in the region near the center 16 of the fan hub 18 or in the region of the circumference with the fan hub 18.
  • the unconnected portions of the fan blades 12 may move under the action of centrifugal force and fluid pressure, i. deformed by the pressure exerted by the air flow.
  • these areas can be formed pliable.
  • a deformable by centrifugal force and fluid force region 26a (close to the circumference) or 28a (close to the center) of the fan blades 12 forms a part of the adjusting device 26, 28.
  • the fan blade 12 can along its longitudinal line 20 at least partially connected to the fan hub 18 and partially separated from the fan hub 18 be.
  • connection 30 of its areas near the axis of rotation 28a (FIGS. 1a and 1b) or a (partial) connection 32 of its areas near the periphery 26a (FIG. 1c) are provided on the fan hub 18.
  • connection 32 of its circumferential areas 26a with the fan hub 18 is provided, as can be seen in FIGS. 2a, 2b.
  • connection 32 In the region of the outer circumference, the fan blades 12 are connected to the fan hub 18 (connection 32), while the region of the fan blades 12 near the center is detached from the fan hub 18.
  • the fan blades 12 and the Fan 10 designed to suitably suitable to achieve the particular goal in combination with the speed-dependent deformation of the fan blades 12 and a convenient adjustment mechanism according to the second alternative.
  • the geometry adjustment for changing the flow guidance can be done passively by a targeted, variable-speed blade deformation due to the material elasticity of the radial fan by utilizing fluid and centrifugal forces. With sufficient space can in principle also an active blade adjustment (mechanical adjustment) take place.
  • FIG. 3a to 3c show a position of the fan blades 12 at the same speeds and under the action of centrifugal and fluid forces.
  • Position 12a corresponds to undeformed fan blades 12.
  • the deformation of the fan blades 12 in the unconnected regions is clearly seen, with a backward curved fan blade 12 having inner, i.e., inner, fan blades. Center closer, connection to the fan hub, not shown in Fig. 3a and with an outer, i. Nearby close, connection to a fan hub in Fig. 3b is shown.
  • Fig. 3c shows a forward curved fan blade with external connection to the fan hub, not shown.
  • movable elements 40 may be provided on the fan hub 18, which change the air flow as a function of the speed.
  • Fig. 4a shows a plan view of a preferred fan 10 (fan blades are not shown) in which the example designed as flaps elements 40 are provided in the manner of half of the fan hub 18 punched tongues.
  • 4b shows a side view of the fan 10. It can be seen how, at low speeds, an air flow L1 is deflected relatively weakly by the flap-shaped element 40. In this state, the air flow L1 is conveyed optimally. At higher speeds, designed as a flap element 40a of the fan 10 lifts something and deflects the air flow L2 more than at lower speeds. Here, the flap ensures that the air leaves the fan 10 earlier.
  • the idling speed of a power tool or electrical appliance can be advantageously reduced. This can be realized by a stronger deflection of the fan flow during idle operation of the power tool. At the same time a good overall efficiency can be achieved in the operating points of the tool or device (lower speed).
  • the operation of the second alternative to a vacuum cleaner can be explained.
  • the fan of a vacuum cleaner promotes a certain amount of air in normal operation, which should be as large as possible to allow a good suction result. Sucking the vacuum cleaner to a surface so that no airflow can be sucked in, the fan speed increases as no air is carried and no more power is required from the driving electric motor.
  • the performance of the fan in this area of high speeds according to the second alternative now causes the vacuum sucks weaker and the vacuum cleaner can be easily detached from the surface. Then the speed drops again, because again air can be sucked.
  • the air flow can rise again, and it can be sucked on normally.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne un ventilateur (10), en particulier un ventilateur radial, comportant un moyeu (18) avec un axe de rotation (14), une pluralité de pales (12) étant disposée autour de l’axe de rotation (14) pour dévier un flux d’air (L1, L2). L'invention propose de prévoir un dispositif de réglage (26, 28, 40), sur les pales (12), pour régler un flux d'air (L1, L2) en fonction de la vitesse de rotation.
EP09741916A 2008-05-05 2009-01-08 Ventilateur et procédé permettant de faire fonctionner un ventilateur Withdrawn EP2283237A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008001556A DE102008001556A1 (de) 2008-05-05 2008-05-05 Lüfter und Verfahren zum Betreiben eines Lüfters
PCT/EP2009/050158 WO2009135698A1 (fr) 2008-05-05 2009-01-08 Ventilateur et procédé permettant de faire fonctionner un ventilateur

Publications (1)

Publication Number Publication Date
EP2283237A1 true EP2283237A1 (fr) 2011-02-16

Family

ID=40442083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09741916A Withdrawn EP2283237A1 (fr) 2008-05-05 2009-01-08 Ventilateur et procédé permettant de faire fonctionner un ventilateur

Country Status (5)

Country Link
US (1) US20110058946A1 (fr)
EP (1) EP2283237A1 (fr)
CN (1) CN102099586A (fr)
DE (1) DE102008001556A1 (fr)
WO (1) WO2009135698A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010002673A1 (de) * 2010-03-09 2011-09-15 Robert Bosch Gmbh Handwerkzeugmaschinenlüfter
AU2013263811B2 (en) * 2012-12-03 2018-03-15 Angelo Lambrinos Notaras Motorised Portable Blower Apparatus
US9689264B2 (en) * 2013-03-15 2017-06-27 Regal Beloit America, Inc. Centrifugal fan impeller with variable shape fan blades and method of assembly
CN103516134B (zh) * 2013-03-26 2015-11-25 宁波市成大机械研究所 一种电机用轴流风扇
DE102017223185A1 (de) * 2017-12-19 2019-06-19 BSH Hausgeräte GmbH Lüfterrad für ein Hausgerät, Lüfter mit Lüfterrad und Hausgerät mit Lüfter
CN214660989U (zh) 2021-04-30 2021-11-09 中强光电股份有限公司 风扇结构

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DE168085C (fr) *
DE280189C (fr) *
DE662032C (de) * 1935-03-29 1938-07-02 Siemens Schuckertwerke Akt Ges Umlaufender Luefter mit geringer Geraeuschentwicklung
US2406499A (en) * 1943-08-23 1946-08-27 Bendix Aviat Corp Fluid transmission
US2370600A (en) * 1943-11-11 1945-02-27 Gen Electric Centrifugal fan
US2766964A (en) * 1952-06-25 1956-10-16 Nils T Almquist Self-governing turbine
DE1016361B (de) * 1956-01-05 1957-09-26 Bbc Brown Boveri & Cie Elektrische Maschine mit Radialluefter
US3006534A (en) * 1959-11-02 1961-10-31 Westinghouse Electric Corp Centrifugal fans
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DE2049679A1 (de) * 1970-10-09 1972-04-13 Bosch Gmbh Robert Lüfter für eine elektrische Maschine
US3856432A (en) * 1973-09-27 1974-12-24 Us Army Self-governing turbine speed limiter
NO150135C (no) * 1982-05-10 1984-08-22 Kongsberg Vapenfab As Anordning ved ramluftturbiner
DE3272588D1 (en) * 1982-09-14 1986-09-18 Siemens Ag Fan comprising automatically adjustable blades about its longitudinal axis to avoid undesirable rotational speed
FR2632686B1 (fr) * 1988-06-14 1993-07-16 Thomson Brandt Armements
JP2828586B2 (ja) * 1993-12-28 1998-11-25 三菱電機株式会社 回転ファン
DE4434598A1 (de) * 1994-09-28 1996-04-04 Braun Ag Radiallüfter zur Luftkühlung eines elektrischen Kleinmotors
DE19715167C2 (de) * 1997-04-11 1999-08-12 Volker Schirm Vorrichtung zum Betrieb eines Lüfters oder einer Wasserpumpe
US5993158A (en) * 1997-10-17 1999-11-30 Dbs Manufacturing, Inc. Method and apparatus for aeration using flexible blade impeller
US6547519B2 (en) * 2001-04-13 2003-04-15 Hewlett Packard Development Company, L.P. Blower impeller apparatus with pivotable blades
US6474936B1 (en) * 2001-04-13 2002-11-05 Hewlett-Packard Company Blower impeller apparatus with one way valves
DE10155224A1 (de) * 2001-11-09 2003-05-22 Bosch Gmbh Robert Lüfterrad für elektrische Maschinen

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
CN102099586A (zh) 2011-06-15
DE102008001556A1 (de) 2009-11-12
US20110058946A1 (en) 2011-03-10
WO2009135698A1 (fr) 2009-11-12

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