EP0284709A2 - Ventilateur résersible - Google Patents

Ventilateur résersible Download PDF

Info

Publication number: EP0284709A2
Authority: EP; European Patent Office
Prior art keywords: wing; fan; rotation; fan according; wing surface
Prior art date: 1987-04-01
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.): Granted

Application number

EP87890299A

Other languages

German (de)

English (en)

Other versions

EP0284709B1 (fr

EP0284709A3 (en

Inventor

Theodor Dr. Vanicek

Friedrich Vanicek

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.)

Individual

Original Assignee

Individual

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.)

1987-04-01

Filing date

1987-12-30

Publication date

1988-10-05

1987-12-30 Application filed by Individual filed Critical Individual

1988-10-05 Publication of EP0284709A2 publication Critical patent/EP0284709A2/fr

1989-03-01 Publication of EP0284709A3 publication Critical patent/EP0284709A3/de

1991-04-10 Application granted granted Critical

1991-04-10 Publication of EP0284709B1 publication Critical patent/EP0284709B1/fr

2007-12-30 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

Images

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
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
- F04D19/005—Axial flow fans reversible fans
- 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
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/382—Flexible blades

Definitions

the invention relates to a fan with a reversible direction of rotation for changing the conveying direction, in particular for air circulation in wood drying systems, with blades attached to the fan shaft, of which each blade has at least two substantially radially extending blade carriers, which together carry a blade surface.
Axial fans with a diameter of 10 cm up to 4 m are used to move large amounts of air with low air resistance. These fans have blades made of sheet metal or profile blades; Full profiles are e.g. above a certain power, which depends on the Reynolds number, e.g. when higher air outputs with greater resistance and higher peripheral speeds are to be achieved.
GB-PS 581 956, GB-PS 15 113 (AD 1908), GB-PS 8 777 (AD 1908), US-PS 511 442 and GB-PS 1 509 903 fans are different Structure known that can not be used with an acceptable level of efficiency for operation with reversible direction of rotation with simultaneous change of conveying direction.
fans that are intended to convey in opposite directions can be solved in various ways.
reversible fans are used, for which a straight or double-sided blade is used, so that it does not matter in which direction the fan rotates.
the air performance is poor in both directions of rotation, since the fan blades, which have the same profile in both directions, are not very efficient.
fans in their or with their suspensions can be rotated around an off-axis bearing, so that they can be pivoted in one or the opposite direction.
the turning of the blades can be adjusted in the opposite direction by a turning mechanism in fans.
these solutions are unsatisfactory, since such constructions are complex and relatively expensive and the effort-efficiency ratio is not optimal.
the object of the invention is to create a fan which can be used in reversible operation and which has a largely optimal efficiency in both directions of rotation.
This is achieved according to the invention in a fan of the type mentioned at the outset in that, in order to adapt the wing surfaces to an ideal air-directing or wing profile, the width of the flexible wing surface is greater than the respective internal distance between the wing carriers or the elastically stretchable wing surfaces during the rotation by the Air pressure can be expanded in an arc shape, so that the wing surface can be moved or expanded unhindered in accordance with the directions of rotation from one side to the other side of a plane spanned by the two wing carriers.
the fan blade has the wing-bearing Wing carriers which carry wing surfaces made of thin plates or foils made of sheet metal or plastic or a covering made of textile or plastic fabric.
the wing surfaces When the fan is turned, the wing surfaces almost completely adopt an ideal air duct or wing profile. Because the width of the wing area is greater than the respective distance between the wing carriers, the wing area can bulge in a direction opposite to the conveying direction of the fan during operation and assume a wing profile which is adapted to an ideal air flow pattern.
the efficiency of the fan according to the invention is not completely equivalent to that of conventional axial fans, the wing profile of which is optimally selected and the blades of which are made of sheet metal or hollow profiles, but it is up to 90-95% of the efficiency of these fans which only promote in one direction. so that due to the simplicity of the construction of the reversible direction of rotation fan according to the invention, this disadvantage of the reduced efficiency is not significant.
each folded end in the plane of the wing surface having play for a displacement and / or pivoting with respect to the longitudinal support has or if wing surfaces made of canvas, fabric, plastic fabric or the like. with their lateral ends or flanks, e.g. in the form of loops, preferably fixed, are connected to the wing carriers.
a good efficiency results if the deflection of the wing surface to the width of the wing surface or to the inner distance of the wing carrier delimiting the wing surface is in a ratio of 1: 5 to 1:20, preferably of 1:10, or when in operation Direction of rotation or plane of rotation forms a tangent to the leading end of the wing surface.
the directions of rotation of the fans can also be periodically reversed, for example, so that the general spatial flow path of the air in the system remains the same, but the flow direction is changed by 180 °.
a heating device is preferably assigned to each fan in a manner known per se. This can be controlled by a controller, wherein a thermocouple for individual detection and control of the heating power of the heating device of this fan is preferably assigned to each fan or its air flow. In this way, the heat can be supplied correctly in direct relation to the water output of the wood piles, which results in lower heat consumption.
a further embodiment of the invention is characterized in that an air velocity measuring probe is preferably assigned to each fan or its air flow, so that the air velocity can be regulated individually.
the speed of the fans is regulated by the air speed measuring probes in such a way that with different wood thicknesses, in particular with different stacking slats and differently laid boards, an air speed corresponding to the program can be adjusted.
each fan's speed can be changed suddenly in order to change the air flow by volume pulses.
the air flow can be adapted to the drying process by volume pulses. The purpose of these impulses is to replace the laminar boundary climate on the wood surface with a turbulent flow.
Fig. 1 shows a shaft 1 of a fan, on which a frame structure 2 of a fan blade 3 is attached in relation to the shaft.
the frame structure 2 has wing carriers 4 which extend essentially radially from the shaft 1 and are connected on the outside by a web 5, preferably in one piece. In the area of the shaft 1, the wing carriers 4 can be connected by means of a crossbar 6.
wing surface 7 a flexible, thin metal or plastic plate or foil is provided as wing surface 7; 2 shows, as already mentioned, a section along the line II-II of FIG. 1. It can be seen that the wing surface 7 surrounds the side members 4 with their flanks or lateral ends and is bent back on or towards itself, the flanks or lateral ends of the wing surface at 8 on the wing surface 7 even by riveting, gluing, welding, spot welding or the like. are attached. The flanks or lateral ends of the wing surface 7 are bent around the wing carrier 4 to form loops 9 in such a way that a free space or channel 9 'is formed which displaces the area of the wing surface or the loops 9 transversely to the wing carriers 4 enables.
the size of the deflection d in the longitudinal direction of the wing surface 7 can be changed.
the deflection d in the region near the shaft is chosen to be greater than in the region of the outer web 5 This can be achieved by appropriate selection of the size of the loops 9 along the side members 4.
the deflection d can be caused by the distance between the Wing carriers 4 exceeding width of the wing surface 7 in the longitudinal direction of the wing carrier 4 can be changed continuously or discontinuously.
Fig. 4 shows essentially the same structure of the wing as Figs. 1 to 3, but as wing surface 7 is a canvas, a fabric, e.g. a plastic fabric or the like. intended.
the lateral ends or flanks of the wing surface 7 are fastened to the wing carriers 4 with little or no play, e.g. glued, clamped, or fastened by turning over in the form of a narrow loop 9 and / or sewing, in particular in order to avoid fluttering of the fabric or fabric when the direction of rotation changes.
a fastening device 10 e.g. a loop, as shown in dash-dotted lines in Fig. 1, may be provided, which is attached to the inner lower end of the wing surface 7 and extends around the crossbar 6, so that radial movement of the soft wing surface 7 is prevented outwards.
Fig. 5 shows a section through a fan blade 3 in operation.
the wing surface 7 takes a course such that the straight line parallel to the direction of rotation 11 of the fan or the fan blade 3 can be applied as a tangent 13 to the wing surface 7 when the wing carrier 4 leads in the direction of rotation by choosing the deflection d is.
the flanks or lateral ends of the wings advantageously include the wing carriers 4 with the formation of channels or loops 9 with play.
the plane spanned by the wing carriers 4 set in relation to the direction of rotation includes an angle ⁇ of approximately 15 to 20 ° with the direction of rotation or plane of rotation.
the deflection of the wing surface 7 is in a ratio of 1: 5 to 1:20, preferably of about 1:10, to the width of the wing surface or to the inner distance of the wing carrier 4 delimiting the wing surface.
the width of the wing surface 7 is understood to mean its width in the unmounted or flat state. This width must always be greater than the space between the wing supports 4, otherwise - except for an elastic, stretchable material - the wing surface 7 could not bulge or bend. Not included in the definition of the width are those parts of the wing surface 7 which are firmly connected to the wing carriers 4 (for example the coverings of the wing carriers 4 according to FIG. 4) and cannot contribute to bulging of the wing surface.
the loops 9 rotate about the wing carrier 4 when the direction of rotation of the wing surface 7 is changed and the deflection d changes to the other side of the wing plane due to the air pressure.
the basic unit formed from four square fans 1 ⁇ , 2 ⁇ , 3 ⁇ , 4 ⁇ with reversible direction of rotation is shown in four different operating states.
the fans 1 ⁇ , 2 ⁇ , 3 ⁇ , 4 ⁇ are arranged in a wall W dividing or closing the drying chamber K (see FIGS. 10-13).
the reference character R denotes the flow path or the flow direction of the air indicated by arrows. It is assumed that when the fan 1 ⁇ rotates clockwise, an air flow directed at the viewer of FIG. 6 is generated, and thus this fan acts as a pressure fan (reference symbol D) with respect to the viewer.
the two upper fans 1 ⁇ and 3 ⁇ work as pressure or suction fans and also the two lower fans 2 ⁇ and 4 ⁇ as D and S fans, the horizontal is shown, from left to right air flow R.
10A and 10B show in elevation and section plan, respectively, a multiple arrangement of the basic unit shown in FIGS. 6-9, i.e. of a total of four such basic units, arranged in an upright partition W of the drying chamber K.
10 B shows the lower half of FIG. 10 A.
the individual fans are identified by the reference numerals 1 ⁇ , 2 ⁇ , 3 ⁇ , 4 ⁇ ; 1.1.2.1.3.1.4.1; 1.2.2.2.3.2.4.2; 1.3.2.3.3.3.4.3 provide and run in the manner shown as S or D fans. As indicated by the arrows R of the air flow, this results in a quasi "opposite" (i.e. one with an alternating, opposite direction of rotation in plan) horizontal flow.
FIGS. 11 A and 11 B show in the same way and with the same reference numerals or the same symbols as FIGS. 10 A and 10 B a quasi "same-direction" horizontal flow.
FIGS. 10 A and 10 B show in the same way and with the same reference numerals or the same symbols as FIGS. 10 A and 10 B an "opposite" vertical flow.
FIGS. 13 A and 13 B show in the same way and with the same reference numerals or the same symbols as FIGS. 10 A and 10 B, a "same-direction" vertical flow.
FIGS. 12 and 13 only applies to the drying chambers K arranged in the floor plan next to the fan wall W, whereas the flow in the area of the fan wall W runs horizontally.

Landscapes

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

EP19870890299 1987-04-01 1987-12-30 Ventilateur résersible Expired - Lifetime EP0284709B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
AT793/87		1987-04-01
AT79387A AT403734B (de)	1987-04-01	1987-04-01	Anordnung von axialventilatoren für holztrocknungsanlagen

Publications (3)

Publication Number	Publication Date
EP0284709A2 true EP0284709A2 (fr)	1988-10-05
EP0284709A3 EP0284709A3 (en)	1989-03-01
EP0284709B1 EP0284709B1 (fr)	1991-04-10

Family

ID=3499896

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19870890299 Expired - Lifetime EP0284709B1 (fr)	1987-04-01	1987-12-30	Ventilateur résersible

Country Status (4)

Country	Link
EP (1)	EP0284709B1 (fr)
AT (1)	AT403734B (fr)
DE (1)	DE3769311D1 (fr)
GR (1)	GR3002007T3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB2237330B (en) *	1989-10-07	1994-08-24	John Nicoll Vannan	Semi flexible vane and fluid machine incorporating a plurality of such vanes
AT407797B (de) *	1999-01-29	2001-06-25	Theodor Dr Vanicek	Trocknungsanlage
US7434743B2 (en) *	2005-01-28	2008-10-14	Hewlett-Packard Development Company, L.P.	Reversible fan of electronic module
WO2008154791A1 (fr) *	2007-06-19	2008-12-24	Shenzhen Lianchuang Industry Co., Ltd.	Appareil de climatisation domestique ultra-mince
EP2631580A1 (fr) *	2012-02-22	2013-08-28	Bühler AG	Séchage d'aliments, notamment de produits à base de pâtes, doté d'un battant de ventilateur comprenant une matière plastique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
AT404876B (de) *	1995-05-16	1999-03-25	Andritz Patentverwaltung	Verfahren zum trocknen von feuchtem gut, insbesonders von holzfasern und anlage zur durchführung dieses verfahrens

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE323848C (de) *		1920-08-13	Aeg	Stoffschaufel fuer Zentrifugalventilmotoren
US1976410A (en) *	1931-06-08	1934-10-09	Howard B Oakleaf	Lumber drying apparatus for yard use
US2149267A (en) *	1936-04-02	1939-03-07	Gen Motors Corp	Fan
DE694061C (de) *	1937-12-05	1940-07-24	Siemens Schuckertwerke Akt Ges	Raumfaecher, Tischfaecher, Wandfaecher o. dgl.
GB581956A (en) *	1944-06-12	1946-10-30	John Newton Collins	Improvements relating to air impellers or fans
EP0043959B1 (fr) *	1980-07-11	1984-08-29	Niro Plan Ag	Four à circulation d'air chauffé à gaz ou électriquement pour cuire des denrées alimentaires
DE3321673C2 (de) *	1983-06-15	1985-05-30	Max 8908 Krumbach Wagner	Verfahren und Vorrichtung zum Trocknen von keramischen Formlingen
DE3340489A1 (de) *	1983-11-09	1985-08-14	Lignomat GmbH, 7148 Remseck	Verfahren zum trocknen von schnittholz

1987
- 1987-04-01 AT AT79387A patent/AT403734B/de not_active IP Right Cessation
- 1987-12-30 EP EP19870890299 patent/EP0284709B1/fr not_active Expired - Lifetime
- 1987-12-30 DE DE8787890299T patent/DE3769311D1/de not_active Expired - Lifetime
1991
- 1991-05-28 GR GR91400681T patent/GR3002007T3/el unknown

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB2237330B (en) *	1989-10-07	1994-08-24	John Nicoll Vannan	Semi flexible vane and fluid machine incorporating a plurality of such vanes
AT407797B (de) *	1999-01-29	2001-06-25	Theodor Dr Vanicek	Trocknungsanlage
US7434743B2 (en) *	2005-01-28	2008-10-14	Hewlett-Packard Development Company, L.P.	Reversible fan of electronic module
GB2422727B (en) *	2005-01-28	2009-08-19	Hewlett Packard Development Co	Reversible fan of electronic module
WO2008154791A1 (fr) *	2007-06-19	2008-12-24	Shenzhen Lianchuang Industry Co., Ltd.	Appareil de climatisation domestique ultra-mince
EP2631580A1 (fr) *	2012-02-22	2013-08-28	Bühler AG	Séchage d'aliments, notamment de produits à base de pâtes, doté d'un battant de ventilateur comprenant une matière plastique
WO2013124220A1 (fr) *	2012-02-22	2013-08-29	Bühler AG	Séchage de produits alimentaires, en particulier de pâtes, avec une pale de ventilateur contenant du plastique

Also Published As

Publication number	Publication date
ATA79387A (de)	1997-09-15
EP0284709B1 (fr)	1991-04-10
DE3769311D1 (de)	1991-05-16
GR3002007T3 (en)	1992-12-30
EP0284709A3 (en)	1989-03-01
AT403734B (de)	1998-05-25

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Date	Code	Title	Description
1988-08-20	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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1991-02-23	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
1991-03-28	ITF	It: translation for a ep patent filed
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