EP1657450A1 - Tragplatte für Lüfter - Google Patents

Tragplatte für Lüfter Download PDF

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Publication number
EP1657450A1
EP1657450A1 EP04105739A EP04105739A EP1657450A1 EP 1657450 A1 EP1657450 A1 EP 1657450A1 EP 04105739 A EP04105739 A EP 04105739A EP 04105739 A EP04105739 A EP 04105739A EP 1657450 A1 EP1657450 A1 EP 1657450A1
Authority
EP
European Patent Office
Prior art keywords
plate
impeller
motor
suspension
location
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Withdrawn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
EP04105739A
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English (en)
French (fr)
Inventor
Hans Östberg
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP04105739A priority Critical patent/EP1657450A1/de
Publication of EP1657450A1 publication Critical patent/EP1657450A1/de
Withdrawn legal-status Critical Current

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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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings

Definitions

  • the present invention relates to a plate for suspension of an impeller with motor of a fan used for transport of air therein with the axis of rotation of the impeller substantially perpendicular to the plate, said plate being adapted to form a part of a housing of a said fan enclosing said impeller with motor and the plate rising towards the location for suspension of the impeller with motor by that located on a higher level than the periphery of the plate.
  • the invention is restricted to such plates for fans used for transport of air, which is to be interpreted as fans arranged in connection to any type of duct and does not include fans used for air circulation of the table fan or ventilator type.
  • air is here to be interpreted to include any gases or gas mixtures, such as air contaminated with any other gas, such as carbon monoxide.
  • this plate forms a part of a housing of a fan and may even be an entire wall (top) of the housing.
  • the stability has to be high for a plate of this type so as to avoid disturbing noises in operation and damage of the plate or other parts of the fan during transport due to an often comparatively high weight of impeller with motor.
  • the impeller is normally provided with a lower collar having an inner diameter slightly exceeding the outer diameter of a nozzle of an inlet part of the fan to be received therein, which also requires a high stability of the plate, so that the rotating collar in operation never comes into contact with the stationary nozzle, which would be unacceptable due to disturbing noises and a risk of damage of the fan.
  • the object of the present invention is to provide a plate of the type defined in the introduction which solves the problem with obtaining said required stability in a way being at least in some respect more advantageous than in such plates already known.
  • This object is according to the invention obtained by providing such a plate with at least two stiffening indentations extending from positions at the periphery of the plate separated by a substantial distance towards the location for the suspension of the impeller with motor.
  • positions at the periphery of the plate is to be interpreted also to include that these indentations start at a distance from the periphery being small with respect to the distance of the periphery to said location, so that for instance a flat surrounding frame may be formed at the periphery of the plate.
  • said indentations extend from the periphery of the plate in a direction making an angle different from 90° with respect to said axis of rotation of the impeller. It has been found that such indentations rising towards said location for suspension of the impeller with motor as do the rest of the plate are particularly efficient for increasing the stability of a plate of this type.
  • said angle differ from 90° by 2-10°, preferably 2,5-9°, which has been found to give a considerable increase in stability with respect to a plate with the same thickness but without indentations and also be comfortable to manufacture.
  • This plate may and is often designed as a lid to be hinged with respect to the rest of a said fan housing for enabling pivoting of this lid upwards for lifting the impeller with motor out of said housing for inspection, maintenance and/or cleaning.
  • the stability requirements are even higher when a small clearance between a said collar and nozzle is to be obtained while avoiding mutual contact of these parts during such pivoting.
  • the plate according to the invention is mostly substantially rectangular, which includes a square such plate as well as a plate having two sides being substantially longer than the other two sides.
  • the location for suspension of the impeller with motor is then preferably located in the middle between two first opposite sides of the plate and substantially closer to one of the other two second opposite sides of the plate then the other second side.
  • Such a position of the suspension location is mostly used for making it easier to obtain said pivoting of the plate while avoiding contact between collar and nozzle, but it may also be used for obtaining an offset location of the impeller with motor with respect to the centre line of the fan housing. It is then preferred that said second sides are the shorter sides of the plate.
  • the plate is substantially rectangular and it is provided with at least four stiffening indentations extending cross-like from the respective corner of the plate towards the location for suspension of the impeller with motor. It has turned out that the arrangement of four such indentations extending in this way improves the stability of a plate of a given thickness considerably while being comparatively easy to produce.
  • the plate is substantially rectangular with two sides being substantially longer than the other two sides and said location for suspension closer to one shorter side of the plate, one indentation extending from each corner of the second side of the plate being most distant to said location for the suspension of the impeller with motor.
  • the arrangement of two such indentations will improve the stability of such a plate having a given thickness substantially with respect to a plate lacking such indentations, although the stability will be still further improved by a said cross-like extension of four stiffening indentations as mentioned above.
  • the plate according to the invention is preferably made of a metal sheet, such as a steel sheet.
  • the invention also relates to a method for producing a plate for suspension of an impeller with motor of a fan used for transport of air therein with the axis of rotation of the impeller substantially perpendicular to the plate, said plate being adapted to form a part of a housing of a said fan enclosing said impeller with motor and the plate rising towards the location for suspension of the impeller with motor by that located on a higher level than the periphery of the plate, and this method is characterized in that a metal sheet having a substantially flat rectangular shape is securely held at the periphery thereof and the plate is provided with at least two stiffening indentations extending from corners at the periphery of the plate towards the location for suspension of the impeller with motor by pressing formers having the extension intended for said indentations towards one of the large surfaces of said metal sheet.
  • the pressing step is a so-called cross-pressing step comprising a pressing of four formers extending cross-like from the respective corner of the metal sheet towards the location for the suspension of the impeller with motor against said large surface of the metal sheet.
  • Fig 1 schematically illustrates a part of a fan 1, here a so-called duct fan, having a plate 2 according to the invention for suspension of an impeller 3 with motor 4 therein with the axis of rotation of the impeller substantially perpendicular to the plate.
  • This plate 2 forms a part, namely a part of the top, of a housing 5 of the fan enclosing the impeller with motor.
  • the impeller is arranged in an outlet room 6 of the housing separated from an inlet room 7 by a partition wall 8 schematically indicated.
  • the impeller 3 is at its lower side provided with a collar 9 (reference is now also made to Fig 2) having a slightly larger inner diameter than the outer diameter of a nozzle 10 forming an opening through the partition wall 8 from the inlet room to the outlet room.
  • the difference between said inner and outer diameters may for example be as small as in the region of 4 mm when the diameters are in the region of 300 mm.
  • This small clearance between the collar 9 and the nozzle 10 when the collar wraps over the nozzle requires a high stability of the plate, since the rotating collar 9 may never come into contact with the stationary nozzle during the operation of the fan.
  • the impeller shown in Figs 1 and 2 has blades 23 curved backwards with respect to the rotation direction of the impeller, which means that the impeller shown in Figs 1 and 2 will be intended to rotate counter clockwise as seen from above.
  • the plate 2 is hinged by hinges 11 with respect to the rest of the fan housing 5 for enabling pivoting of the lid formed by the plate upwards for lifting the impeller with motor out of said housing for inspection, maintenance, and/or cleaning as illustrated in Fig 2.
  • the plate 2 is substantially rectangular with two first sides 13, 14 being substantially longer than the other two, second sides 15, 16, and the location 12 for suspension of the impeller with motor is located in the middle between the two first sides 13, 14 and substantially closer to one of the second sides, namely the second side 15 being opposite to the hinges 11.
  • the reason for this is that it will then be possible to have a very small clearance between the nozzle 10 and the collar 9 and still pivot these two parts with respect to each other without hitting the nozzle by the collar.
  • the plate 2 is provided with four stiffening indentations 17 formed on the lower side of the plate with the bottoms thereof on a higher level than the adjacent portions of the plate, said indentations extending from positions at the periphery of the plate separated by a substantial distance, namely from the corners of the plate, towards the location 12 for the suspension of the impeller with motor. It is shown that these "periphery positions" are located at a small distance to the outer edge of the respective corner, so that a substantially flat frame 18 is formed.
  • the plate and the indentations will rise towards said location 12, which will through this be located so that there will be a difference in height between the upper surface of the plate at the periphery (the frame 18) and said location 12 for suspension of the impeller with motor.
  • the indentations will make an angle differing from 90° by 2-10°. In different embodiments of the plate according to Figs 1 and 2 said angle will be 2,7-6° for the longer indentations and 3,7-8,9° for the shorter ones.
  • indentations will substantially increase the stability of such a plate of a given thickness with respect to such a plate having no such indentations. It has turned out that the thickness of a steel sheet used for such a plate may in one embodiment be reduced from 2 mm to 1.2-1.5 mm while maintaining the same stability, which means a considerable saving of material and thereby reduction of weight and costs.
  • FIG 3 illustrates how a plate according to the invention may be manufactured.
  • a metal sheet 19 having a substantially flat rectangular shape is securely held close to the periphery 20 thereof through means not shown and formers 21 extending cross-like are then pressed against one of the large surfaces of the sheet 19, in this case from below, for forming said indentations.
  • the sheet 19 may in advance be provided with an opening at the location for said suspension when desired.
  • the formers 21 adjoin to a circular block 22 used for defining said suspension location 12 and defines together with the formers said height difference between said location and the periphery of the plate.
  • Fig 4 schematically illustrates a plate 2' according to a second embodiment of the present invention, which differs from the one shown in Figs 1 and 2 by the fact that it has only two stiffening indentations 17, one extending from each corner of the second side 16 of the plate being most distant to the location 12 for suspension of the impeller with motor. Also this embodiment results in a remarkably increased stability at a given thickness of the plate with respect to a plate without such indentations, although the stability could be further increased by designing the plate in accordance with the embodiment according to Figs 1 and 2.
  • the plate may be designed for suspension of any type of impeller, and this may just as well have blades curved forwards, although the advantages of the invention are particularly accentuated for an impeller having blades curved backwards and having a larger diameter and by that requiring a larger plate and also often being heavier.
  • substantially rectangular also comprises a rectangular plate having edges or corners being rounded or chamfered.
  • the four walls of the fan extending from the inlet to the outlet thereof are preferably externally covered by a layer with sound and fire insulating properties, such as of glass wool or mineral wool and having typically a thickness of 3-6 cm. At the position of the plate this layer is then divided for forming a separate lid thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP04105739A 2004-11-12 2004-11-12 Tragplatte für Lüfter Withdrawn EP1657450A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04105739A EP1657450A1 (de) 2004-11-12 2004-11-12 Tragplatte für Lüfter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04105739A EP1657450A1 (de) 2004-11-12 2004-11-12 Tragplatte für Lüfter

Publications (1)

Publication Number Publication Date
EP1657450A1 true EP1657450A1 (de) 2006-05-17

Family

ID=34929853

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04105739A Withdrawn EP1657450A1 (de) 2004-11-12 2004-11-12 Tragplatte für Lüfter

Country Status (1)

Country Link
EP (1) EP1657450A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014135396A1 (en) * 2013-03-08 2014-09-12 Fergas Ab Fan unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2271425A1 (en) * 1974-05-17 1975-12-12 Fimec Centrifugal fan of cheap construction - has drum housing for motor and rotor and end caps with central partition
US4128364A (en) * 1972-11-23 1978-12-05 Papst-Motoren Kg Radial flow fan with motor cooling and resilient support of rotor shaft
DE4218826A1 (de) * 1992-06-09 1993-12-16 Maico Elektroapparate Radialventilator
DE19906537A1 (de) * 1999-02-17 2000-08-31 Behr Gmbh & Co Gehäuse für ein Radialgebläse einer Heizungs- oder Klimaanlage eines Kraftfahrzeuges
US6509704B1 (en) * 1998-01-23 2003-01-21 Comair Rotron, Inc. Low profile motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4128364A (en) * 1972-11-23 1978-12-05 Papst-Motoren Kg Radial flow fan with motor cooling and resilient support of rotor shaft
FR2271425A1 (en) * 1974-05-17 1975-12-12 Fimec Centrifugal fan of cheap construction - has drum housing for motor and rotor and end caps with central partition
DE4218826A1 (de) * 1992-06-09 1993-12-16 Maico Elektroapparate Radialventilator
US6509704B1 (en) * 1998-01-23 2003-01-21 Comair Rotron, Inc. Low profile motor
DE19906537A1 (de) * 1999-02-17 2000-08-31 Behr Gmbh & Co Gehäuse für ein Radialgebläse einer Heizungs- oder Klimaanlage eines Kraftfahrzeuges

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014135396A1 (en) * 2013-03-08 2014-09-12 Fergas Ab Fan unit

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