EP3330545B1 - Radiallüfter - Google Patents

Radiallüfter Download PDF

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Publication number
EP3330545B1
EP3330545B1 EP17201511.7A EP17201511A EP3330545B1 EP 3330545 B1 EP3330545 B1 EP 3330545B1 EP 17201511 A EP17201511 A EP 17201511A EP 3330545 B1 EP3330545 B1 EP 3330545B1
Authority
EP
European Patent Office
Prior art keywords
motor
stator
side wall
radial blower
conveying space
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.)
Active
Application number
EP17201511.7A
Other languages
English (en)
French (fr)
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EP3330545A1 (de
Inventor
SIlvia Quattrone
Fortunato Grippo
Fabio TANTALO
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.)
Elica SpA
Original Assignee
Elica SpA
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.)
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Publication date
Application filed by Elica SpA filed Critical Elica SpA
Priority to PL17201511T priority Critical patent/PL3330545T3/pl
Publication of EP3330545A1 publication Critical patent/EP3330545A1/de
Application granted granted Critical
Publication of EP3330545B1 publication Critical patent/EP3330545B1/de
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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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • 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
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • 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
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system

Definitions

  • the present invention relates to a radial blower for moving air, e.g. for gas water heaters for domestic sanitary use with thermal powers up to 35 kW.
  • the known radial blowers comprise an impeller rotationally arranged within a substantially toroidal-shaped housing with two side walls and a peripheral wall.
  • An inlet aperture is formed in one of the two side walls arranged in a radially inner, but not necessarily central position of the housing.
  • a tangential portion with an outlet aperture is formed in the peripheral wall.
  • the impeller is rotational by means of an electric motor located outside the housing and connected to the side wall opposite to the inlet aperture.
  • a driving shaft extends from the rotor of the motor through a passage aperture in the side wall inside the housing in which it integrally connects to the impeller.
  • the electric motor comprises its own housing or motor support with a stator seat which accommodates the motor stator and with one or more bearings to support the driving shaft and the rotor of the motor.
  • the motor support is externally screwed to the side wall of the housing.
  • dampers interposed between the motor support and the impeller housing e.g. rubber or silicone bushes, are envisaged.
  • Radial blowers of the prior art are disclosed for example in documents EP 0 408 221 A2 , WO 2016/059776 A1 , DE 10 2013 204 138 A1 or US 2013/0101451 A1 .
  • the radial blower comprises:
  • Making the motor support in one piece with the second side wall of the housing further reduces misalignments between the motor and the housing and respective vibrations (noise).
  • one or more through cooling apertures are formed in the second side wall, extending radially outside of the rotor seat and radially superimposed with the electric motor, in particular with the stator, so as to achieve a cooling communication between the stator (on the outer side of the second side wall) and the conveying space (on the inner side of the second side wall).
  • an electronic control circuit of the electric motor is configured to truncate the current peaks in the windings of the stator, or, in other words, to supply a truncated amplitude wave current to the stator windings, as shown in figure 6 compared with a non-truncated current pattern, shown in figure 7 .
  • a radial blower indicated as a whole by reference numeral 1, comprises an impeller 2 arranged in rotational manner in a conveying space 3 defined inside a housing 4.
  • the housing 4 has a substantially toroidal shape with a first side wall 5 and a second side wall 6 opposite to the first side wall 5, and a peripheral wall 7.
  • An inlet aperture 8 is formed in the first side wall 5 for the gas or air to be conveyed in a radially inner, but not necessarily central position of housing 4.
  • a substantially tangential portion 9, which defines an outlet 10 for gas or air, is formed in the peripheral wall 7.
  • An electric motor 11 is arranged outside the conveying space 3.
  • the motor 11 is adapted to make the impeller 2 rotate by means of a driving shaft 12, which extends through a passage 13 formed in the second side wall 6 from outside the housing 4 into the conveying space 3, in which it connects, in rotationally integral manner, to the impeller 2.
  • a motor support 14 forms a stator seat 15, in which a stator 16 of the motor 11 is received and locked, and a rotor seat 17 for the rotary support of a rotor 18 of the motor 11 and of the driving shaft 12.
  • the motor support 14 is formed directly (or preferably in one piece) with the second side wall 6 and axially protrudes into the conveying space 3 so that the conveying space 3 at least partially envelops the stator 16 and the rotor seat 17.
  • the second side wall 6 comprises a radially outer portion 19, which is substantially flat and perpendicular to the rotation axis 20 of the motor 11 and of the impeller 2.
  • the motor support 14 protrudes, with respect to the radially outer portion 19, axially into the conveying space 3, by an axial length 21 of at least one fourth of a (maximum) axial height 22 of the conveying space 3.
  • the ratio of the axial length 21 to the maximum axial height 22 is in the range from 0.25 to 0.5, advantageously from 0.35 to 0.44, even more advantageously the ratio is about 0.39.
  • the motor support portion 14 which protrudes into the conveying space 3 has a tapered shape towards a free end, preferably formed by an axially more external first portion 23 and adjacent to the radially outer portion 19, and an axially more internal second portion 24, which is radially tapered with respect to the first portion 23, e.g. at a step which forms an intermediate portion 25, which may be planar and perpendicular with respect to the rotation axis 20 or inclined with respect to the rotation axis by an inclination angle from 45° to 135°, preferably from 75° to 105°.
  • the axial length 26 of the first portion 23 is either equal to or greater than the axial length 27 of the second portion 24.
  • the first portion 23 and the second portion 24 both have an outer cylindrical or truncated-cone shape which is concentric to the rotation axis 20.
  • the first portion 23 accommodates at least one portion of the stator 16 and preferably also at least one part of the rotor 18, while the second portion 24 internally forms at least one part of the rotor seat 17, e.g. a seat for a bearing.
  • the motor support 14 invades the conveying space in such a manner not to negatively interfere with the conveying of the air or gas.
  • the maximum axial height 20 denotes the distance between the inner surface of the radially outer portion 19 of the second side wall 6 and an opposite inner surface of a radially outer portion 28 of the first lateral wall 5, also preferably planar and perpendicular to the axis of rotation 20.
  • the maximum axial width 44 of the blades 30 of the impeller 2 is less than 2/3 of the maximum axial height 22 of the conveying space 3, preferably the ratio between the maximum axial width 44 of the blades 30 and the maximum axial height 22 of the conveying space 3 is in the range of 1/3 to 2/3, advantageously from 2/5 to 3/5, even more advantageously from 0.45 to 0.6.
  • the impeller 2, and particularly the blades 30, are positioned adjacent to the first side wall 5 and have an axial width which is smaller than the axial width of the outlet aperture 10, which may be equal to the maximum axial height 22 of the conveying space 3.
  • the impeller does not need to be as wide as the housing, but in order to obtain an optimum output flow and for the need for connection compatibility, the outlet aperture must have a predetermined width, which can be greater than the axial width of the impeller 2. Precisely in these conditions it is advantageous to make the impeller 2 with axial dimensions smaller than the axial dimensions of the outlet aperture 10 and to occupy at least part of the space not occupied by the impeller 2 with the motor 11.
  • the impeller 2 comprises a support wall 29 which connects the blades 30 of the impeller 2 to the driving shaft 12 and which defines the impeller 2 on the side of the second side wall 6, and is shaped as an circular disc extended from the driving shaft 12 to a region that is radially external to the motor support 14 or at least to its first portion 23.
  • one or more through cooling apertures 31 are formed in the second side wall 6, positioned and extending radially outside the rotor seat 17 and radially superimposed with the position of the electric motor 11, in particular with the stator 16, so as to provide a cooling communication between the stator 16 (arranged on the outer side of the second side wall 6) and the conveying space 3 (formed on the inner side of the second side wall 6).
  • a circumferential air flow along the peripheral wall 7 caused by the rotation of the impeller 2 creates a vacuum at the cooling apertures 31, which in turn determines at least one part of the partial cooling flow for the cooling of the stator 16 of the motor 11, and also of the power components of an electronic control board 33 connected to the stator 16.
  • the cooling aperture or apertures 31 are formed in the intermediate portion 25 of the motor support 14, e.g. a circumferential sequence of apertures 31 (e.g. circular, triangular or trapezoidal) alternating with radial connection ribs 34.
  • the cooling of the motor 11 through the cooling apertures 31 advantageously makes it possible to use a motor 11 without own coolant fan and therefore of further reduced axial dimensions.
  • the electronic control circuit 33 of the electric motor 11 is configured to truncate the current peaks in the stator windings, or in other words, to supply the stator windings with a wave current having truncated amplitude at the current peaks.
  • the reduction of torque ripple makes it possible, for example, to accommodate the stator 16 and/or the rotor 18 in the respective housings 15, 17 of the motor support 14 without the interposition of damping layers or elements, and to keep the noise of the blower 1 low in all cases.
  • the electric motor is a unilateral bearing motor and the rotor seat 17 forms a first bearing seat 17' and a second bearing seat 17" which are coaxial.
  • the bearing seats 17', 17" may be formed one facing towards the outside and the other facing towards the inside of the conveying space 3. This positioning facilitates the mounting of the motor and allows the use of fewer components to fix the rotating part.
  • the bearings are preferably smooth cylindrical annular bearings or rolling bearings.
  • the stator seat 15 is formed in an annular wall 35, preferably circular and continuous.
  • the annular wall 35 defines a shoulder 35 which forms an axial abutment surface for the stator 16 and one or more side surfaces 37, which achieve the engagement by clamping of the stator 16, preventing transverse displacements in the axial direction.
  • the stator 16 may comprise one or more snap-coupling portions which interact with respective counter-coupling portions of the motor support 14 to facilitate the provisional or definitive positioning and/or connection thereof.
  • the stator 16 may further form a plurality of fixing holes 38 aligned with corresponding fixing holes 39 formed in the second side wall 6 and/or with corresponding fixing holes 40 formed in a protective lid 41 (possibly provided with cooling apertures or cooling slots) and/or with fixing holes 42 of an electronic control board 33 for fixing the motor 11, by means of screws, to the housing 4.
  • the fixing holes 39 in the second side wall 6 are arranged so that the position of the electronic board 33 may be varied as required.
  • the housing 4 is made of plastic material.
  • the housing 4 may comprise two half-shells made separately, e.g. by molding, and successively joined, e.g. by snap-fastening or by means of a plurality of hooks 43 which can be moved in a snapping manner into respective fastening positions.
  • a damping layer or element (not shown), e.g. made of rubber, may be provided interposed between the rotor 18 and the motor support 14 and/or between the stator 16 and the motor support 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Claims (14)

  1. Radialgebläse (1), umfassend:
    - ein Gehäuse (4) mit einer ersten Seitenwand (5), einer der ersten Seitenwand entgegengesetzten zweiten Seitenwand (6) und einer Umfangswand (7), welche gemeinsam einen Förderraum (3) definieren, wobei die erste Seitenwand (5) eine Einlassöffnung (8) bildet und die Umfangswand (7) eine Auslassöffnung (10) bildet,
    - ein Laufrad (2), welches in dem Förderraum (3) untergebracht ist,
    - einen Elektromotor (11),
    - eine Motorhalterung (14), welche ein Statorgehäuse (15) bildet, in welchem ein Stator (16) des Motors (11) untergebracht ist, und einen Rotorsitz (17) für die Drehhalterung einer Motorwelle (12), welche mit einem Rotor (18) des Motors (11) verbunden ist,
    dadurch gekennzeichnet, dass der Elektromotor (11) außerhalb des Förderraums (3) angeordnet ist und die Motorhalterung (14) direkt durch die zweite Seitenwand (6) gebildet ist und axial in den Förderraum (3) vorsteht, so dass der Förderraum (3) wenigstens teilweise den Stator (16) und den Rotorsitz (17) umhüllt.
  2. Radialgebläse (1) nach Anspruch 1, wobei die zweite Seitenwand (6) einen radial äußeren Abschnitt (19) umfasst, welcher im Wesentlichen flach und senkrecht zu der Drehachse (20) des Laufrads (2) ist, wobei die Motorhalterung (14) in Bezug auf den radial äußeren Abschnitt (19) um eine axiale Länge (21) von wenigstens einem Viertel einer maximalen axialen Höhe (22) des Förderraums (3) in den Förderraum (3) vorsteht.
  3. Radialgebläse (1) nach Anspruch 2, wobei das Verhältnis der axialen Länge (21) zu der maximalen axialen Höhe (22) in dem Bereich von 0,25 bis 0,5, vorteilhaft von 0,35 bis 0,44, liegt, wobei noch vorteilhafter das Verhältnis etwa 0,39 beträgt.
  4. Radialgebläse (1) nach einem der vorhergehenden Ansprüche, wobei der Motorhalterungsabschnitt (14), welcher in den Förderraum (3) vorsteht, einen axial weiter außen liegenden ersten Abschnitt (23) und einen axial weiter innen liegenden zweiten Abschnitt (24), welcher in Bezug auf den ersten Abschnitt (23) radial verjüngt ist, und eine Stufe bildet, welche einen Zwischenabschnitt (25) bildet, welcher entweder senkrecht in Bezug auf die Drehachse (20) oder in Bezug auf die Drehachse (20) mit einem Neigungswinkel von 75° bis 105° geneigt ist.
  5. Radialgebläse (1) nach Anspruch 4, wobei die axiale Länge (26) des ersten Abschnitts (23) entweder gleich wie oder größer als die axiale Länge (27) des zweiten Abschnitts (24) ist.
  6. Radialgebläse (1) nach Anspruch 4 oder 5, wobei der erste Abschnitt (23) und der zweite Abschnitt (24) jeweils eine zylindrische oder kegelstumpfförmige äußere Form aufweisen, welche konzentrisch zu der Drehachse (20) ist, und der erste Abschnitt (23) wenigstens einen Teil des Stators (16) aufnimmt, während der zweite Abschnitt (24) intern wenigstens einen Teil des Rotorsitzes (17), insbesondere einen Sitz für ein Lager, bildet.
  7. Radialgebläse (1) nach einem der vorhergehenden Ansprüche, wobei das Laufrad (2) eine Halterungswand (29) umfasst, welche Schaufeln (30) des Laufrads (2) mit der Motorwelle (12) verbindet und welche das Laufrad (2) an der Seite der zweiten Seitenwand (6) begrenzt, wobei die Halterungswand (29) als eine kreisförmige Scheibe geformt ist, welche sich von der Antriebswelle (12) bis zu einem Bereich erstreckt, welcher in Bezug auf einen Abschnitt (23, 24, 25) der Motorhalterung (14), welcher in den Förderraum (3) vorsteht, radial außerhalb liegt.
  8. Radialgebläse (1) nach einem der vorhergehenden Ansprüche, wobei eine oder mehrere Durchgangskühlöffnungen (31) in der zweiten Seitenwand (6) gebildet sind, wobei die Durchgangskühlöffnungen (31) radial außerhalb des Rotorsitzes (17) und radial mit der Position des Stators (16) des Elektromotors (11) überlagert positioniert sind und sich radial außerhalb des Rotorsitzes (17) und radial mit der Position des Stators (16) des Elektromotors (11) überlagert erstrecken, wobei die Kühlöffnungen (31) eine Kühlverbindung zwischen dem Stator (16) und dem Förderraum (3) bereitstellen.
  9. Radialgebläse (1) nach Anspruch 8, wobei die Kühlöffnungen (31) eine Umfangssequenz der Öffnungen (31) bilden, welche sich mit radialen Verbindungsrippen (34) abwechseln.
  10. Radialgebläse (1) nach Anspruch 8, wobei der Motor (11) abgesehen von dem Laufrad (2) keinen eigenen Kühllüfter aufweist.
  11. Radialgebläse (1) nach einem der vorhergehenden Ansprüche, wobei eine elektronische Steuerschaltung (33) des Elektromotors (11) derart eingerichtet ist, dass sie die Stromspitzen in den Wicklungen des Stators (16) abschneidet.
  12. Radialgebläse (1) nach einem der vorhergehenden Ansprüche, wobei der Stator (16) und der Rotor (18) ohne die Zwischenschaltung von Dämpferschichten oder -elementen in der Motorhalterung (14) gehaltert sind.
  13. Radialgebläse (1) nach einem der vorhergehenden Ansprüche, wobei der Stator (16) einen oder mehrere Schnappkopplungsabschnitte umfasst, welche mit jeweiligen Gegenkopplungsabschnitten der Motorhalterung (14) zusammenwirken, um die Positionierung und/oder Verbindung davon zu erleichtern.
  14. Radialgebläse (1) nach einem der vorhergehenden Ansprüche, wobei der Stator (16) eine Mehrzahl von Befestigungslöchern (38) bildet, welche ausgerichtet sind mit entsprechenden Befestigungslöchern (39), welche in der zweiten Seitenwand (6) gebildet sind, und mit entsprechenden Befestigungslöchern (40), welche in einem Schutzdeckel (41) gebildet sind, und mit Befestigungslöchern (42) einer elektronischen Steuerplatine (33) des Motors (11) zum Befestigen mittels Schrauben des Motors (11) an dem Gehäuse (4), wobei die Befestigungslöcher (39) in der zweiten Seitenwand (6) derart angeordnet sind, dass die Position der elektronischen Platine (33) nach Bedarf variiert werden kann.
EP17201511.7A 2016-11-30 2017-11-14 Radiallüfter Active EP3330545B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17201511T PL3330545T3 (pl) 2016-11-30 2017-11-14 Wentylator promieniowy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102016000121296A IT201600121296A1 (it) 2016-11-30 2016-11-30 Soffiatrice radiale

Publications (2)

Publication Number Publication Date
EP3330545A1 EP3330545A1 (de) 2018-06-06
EP3330545B1 true EP3330545B1 (de) 2021-09-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP17201511.7A Active EP3330545B1 (de) 2016-11-30 2017-11-14 Radiallüfter

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EP (1) EP3330545B1 (de)
IT (1) IT201600121296A1 (de)
PL (1) PL3330545T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4202229A1 (de) * 2021-12-21 2023-06-28 Andreas Stihl AG & Co. KG Kühlluftführung an einem elektrischen blasgerät

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2234012A (en) * 1989-07-14 1991-01-23 Ibm Dc motor driven centrifugal fan
US9574568B2 (en) * 2011-10-20 2017-02-21 Henkel IP & Holding GmbH Double inlet centrifugal blower with a solid center plate
DE102013204138A1 (de) * 2013-03-11 2014-09-11 BSH Bosch und Siemens Hausgeräte GmbH Lagerschild für einen Gebläsemotor eines Radialgebläses einer Dunstabzugshaube
CN106715922B (zh) * 2014-10-14 2018-12-28 松下知识产权经营株式会社 离心式鼓风机及具备该离心式鼓风机的汽车

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4202229A1 (de) * 2021-12-21 2023-06-28 Andreas Stihl AG & Co. KG Kühlluftführung an einem elektrischen blasgerät

Also Published As

Publication number Publication date
PL3330545T3 (pl) 2022-02-07
EP3330545A1 (de) 2018-06-06
IT201600121296A1 (it) 2018-05-30

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