EP1122444A2 - Ventilateur radial et buse pour ventilateur radial - Google Patents

Ventilateur radial et buse pour ventilateur radial Download PDF

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Publication number
EP1122444A2
EP1122444A2 EP01100089A EP01100089A EP1122444A2 EP 1122444 A2 EP1122444 A2 EP 1122444A2 EP 01100089 A EP01100089 A EP 01100089A EP 01100089 A EP01100089 A EP 01100089A EP 1122444 A2 EP1122444 A2 EP 1122444A2
Authority
EP
European Patent Office
Prior art keywords
wall
nozzle
air flow
inlet nozzle
air inlet
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.)
Granted
Application number
EP01100089A
Other languages
German (de)
English (en)
Other versions
EP1122444B1 (fr
EP1122444A3 (fr
Inventor
Oliver Dipl.-Ing. Haaf
Wolfgang Hafen
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.)
Ebm Papst Mulfingen GmbH and Co KG
Original Assignee
Ebm Werke GmbH and Co KG
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 Ebm Werke GmbH and Co KG filed Critical Ebm Werke GmbH and Co KG
Publication of EP1122444A2 publication Critical patent/EP1122444A2/fr
Publication of EP1122444A3 publication Critical patent/EP1122444A3/fr
Application granted granted Critical
Publication of EP1122444B1 publication Critical patent/EP1122444B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • F04D29/684—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid injection

Definitions

  • the present invention relates to a radial fan with a funnel-shaped air inlet nozzle for entry an axial primary air flow and with one the primary air flow deflecting, generating a radial air flow, in particular free-blowing impeller, the wall the air inlet nozzle has a substantially frustoconical shape trained inflow section and yourself adjoining the inflow section in the axial direction, essentially cylindrical, coaxial arranged a central suction opening of the impeller Blowing section and wherein between the Impeller and the wall of the air inlet nozzle a gap Inlet of a secondary air flow is located. Furthermore
  • the invention relates to a nozzle with the above for the Characteristics mentioned air inlet nozzle of the radial fan.
  • Centrifugal fans of the type mentioned above are known and for example in the monograph "Ventilatoren” by L. Bommes; C. Kramer and H.U. Banzhaff (Expert publishing house, Renningen, 1990), DE-OS 14 03 081, DE 29 40 773 A1, DE 198 02 111 A1, DE 199 03 359 A1 and EP 0 769 105 B1.
  • the monograph mentioned contains information on the design of the Radial fan wheel inlet (p. 214 ff.). It will noted that when designing a radial fan paid special attention to the wheel arch have to be, because at this point there is a risk of flow separation is naturally particularly large. To go through constructive measures a low-loss flow deflection the air from the axial to the radial To achieve direction, over-curved nozzles are considered optimal viewed.
  • a deflection contour is made up of two arcs offset from one another are described, namely from an arc on one in a certain way on one Fan housing attached rigid inlet nozzle, and off a circular arc of a rotating impeller nozzle that the Inlet nozzle covered so that the tangents to the Cut arcs at an angle of about 40 ° so that the arc of curvature of the cover disk was cut somewhat becomes.
  • Such curved nozzles with a round deflection contour and overlap of the gap with regard to their pressure number and their internal efficiency with other known wheel inlet designs, as with a round deflection contour not with itself overlapping gap and with angular deflection contour with itself non-overlapping gap can be compared, show comparatively very good performance parameters, however manufacturing technology only with considerable effort.
  • a radial fan is also used or a pump with a special inlet nozzle and with described an impeller with non-profiled blades, where a round deflection contour and covering of the gap between the nozzle and impeller, i.e. where the blowout section the inlet nozzle into the suction opening of the Fan impeller protrudes.
  • the impeller has a relationship its inlet diameter to its outlet diameter between 0.45 and 0.63. With a view to good performance characteristics of the fan become special Ratio of the ring cross-section in the blade inlet to the smallest circular cross section of the inlet nozzle and a value of the blade angle from the blade entrance to for the blade exit in the range from 23 ° to 27 ° as optimal viewed.
  • DE 29 40 773 A1 describes a high-performance radial fan described a spiral casing with a lateral Inlet nozzle and a corresponding impeller or wall on the suction side with side inlet nozzle and has freely blowing impeller and its impeller blades, especially non-profiled blades, e.g. Circular arc blades, has, the impeller on the Inlet nozzle facing side through from above cover plate running below and outside is covered, whose inlet area with the smallest diameter is the facing end of the inflow nozzle overlaps and to the outside with the release of an annular gap with a certain one Gap width covered.
  • an arc-shaped, Parabolic or hyperbolic curve is described with one radius or with several radii, the or the smallest diameter of the inlet area the cover plate (inlet diameter) such as 0.21 - 0.3, preferably like 0.225-0.280 to 1.
  • DE 199 03 359 A1 relates to a centrifugal blower unit with a snail housing to form a Air outlets, a centrifugal fan with several Blades and an electric motor to drive the fan.
  • a funnel-shaped section to form a Intake opening extends to the radially inner one End of the fan to cover part of each wing, and a vortex wall (cover plate) is like that in the wings formed that a first space between the vortex wall and an inner wall of the worm housing is provided.
  • the one with the first Free space communicates between the vortex wall and a wall section is formed, which is based on the funnel-shaped section to an upper wall surface of the worm housing extends, whereby the air flow resistance in one by the two Clearances formed backflow passage enlarged.
  • the air flow resistance in a ventilation system of an air conditioning system should be larger thereby an increase in the (secondary) backflow air volume and an interaction between the return air and the intake air to be prevented from dampen noise generated by the blower unit.
  • both Disclosures are therefore about blower units, in those to the secondary air flow and the resulting Reduce noise, among other things by a suction opening of the Resistance to the gap flow is increased.
  • the subject of EP 0 769 105 B1 is an inlet funnel for centrifugal fans that have a fan wheel with a Have cover plate, the inlet funnel in the cover plate with a gap arranged between them for circulation air opens and the inlet funnel with a conical inlet part is provided, which faces the impeller tapered towards.
  • the inlet funnel has one with the Inlet part connected mouthpiece. Inside the mouthpiece is through the tapered end of the inlet part, which partially inserted into the mouthpiece, a circular, at the intersection between the inlet part and the Mouthpiece of the inlet funnel arranged edge formed, which serves as a flow guiding device designed so is that they detach the flow from the inlet part of the funnel with minimal interference to the flow produces.
  • the patent is therefore about a fluidic and technically as cheap as possible Inlet nozzle in two parts.
  • One conical inlet funnel each and a mouthpiece are fluidically optimized composed in different variants.
  • This two-part design points compared to the above one-piece air inlet nozzles have the disadvantage of an additional one Assembly step on.
  • the present invention is based on the object a radial fan from the described prior art of the generic type and a corresponding one To create nozzle through which with little manufacturing technology Effort to generate noise can be reduced without significant losses occur in the air output of the fan.
  • this object is achieved in that the Wall of the nozzle (air inlet nozzle) on the circumference at least one from an edge of the inflow section facing away from the blow-out section has spaced-apart interference element, through the one in the nozzle (air inlet nozzle) on its wall located boundary layer of the primary air flow as a result an air mixing is widened.
  • the invention is based on the finding that sound is caused by local pressure fluctuations in the air flow in turn for signs of separation or strong changes in speed of the air flow.
  • the Broadened boundary layer on the nozzle wall caused a lower speed gradient when compensating between the primary stream emerging from the air inlet nozzle the nozzle and the one in the gap between the nozzle and the impeller emerging secondary current.
  • the speed gradient has a direct impact on sound performance as it is proportional to the interaction forces acting on the Air particles work. These interaction forces on the Air particles are in turn proportional to the acoustic Performance and therefore the noise level.
  • the width of the transition area between the two Currents increased, so did a decrease of the speed gradient a reduction in Noise level of the whistle.
  • the boundary layer is enlarged on the inside of the nozzle, which takes into account the fact that the flow rate the primary flow during operating conditions in the direction free blowing is greater than the speed of the secondary gap flow.
  • the disturbance element which is in a preferred embodiment of the invention extend in the circumferential direction of the wall can, for example, be an additional part or - in a particularly favorable manufacturing technology - um an embossing act like an embossed bead.
  • the Disruptive element can advantageously be designed so that the air inlet nozzle as a drawn part, i.e. without undercuts, but only as much as possible - with regard to the Longitudinal axis of the nozzle - cylindrical surfaces of the wall can be manufactured.
  • the part costs are hardly higher than in the previously known initially described Nozzles.
  • the mixing and boundary layer broadening can thereby - especially in the case of a return in the Wall of the air inlet nozzle - by one as a result of Static pressure in the flow caused an increase Vortex formation of the primary air flow can be effected or can - especially in the case of a head start in the Wall of the air inlet nozzle (if there is one through a so-called critical Reynolds number marked critical Flow velocity) - by turning one laminar boundary layer flow into a turbulent boundary layer flow occurrence. While it is at Whirling is a flow circling a center, which e.g. detaching the boundary layer from the Can form wall, a turbulence becomes a flow form understood the mainstream movement fluctuations that are disordered in time and space are superimposed.
  • an impressed fixed flow rate can be up to the width of a turbulent boundary layer about three times the width of a laminar boundary layer increase.
  • Another benefit of generating one turbulent boundary layer is that a boundary layer separation of the primary air flow from the wall of the Inlet nozzle is inhibited. Because the flow rate the primary air flow as it passes through the nozzle should increase the dimensions of the air mixing and thereby the broadening of the boundary layer at the Disturbance element causing the nozzle wall to a degree the distance of the interference element from that of the blow-out section corresponds to the opposite edge of the inflow section, lose weight. I.e. the closer the disturbance element to impeller end, the smaller it should be be carried out in order to avoid an efficiency reduction.
  • Radial fan according to the invention a funnel-shaped Air inlet nozzle 1 for the entry of an axial (axis X-X) directed primary air flow P and a the primary air flow P deflecting, generating a radial air flow R. free blowing impeller 2.
  • the wall 3 of the air inlet nozzle 1 has an essentially frustoconical shape trained inflow section 3a and in axial direction X-X to the inflow section 3a in one piece subsequent, essentially cylindrical, coaxial to a central suction opening 4 (see FIG. 4) the impeller 2 arranged, especially in the suction opening 4 protruding blowout section 3b.
  • the air inlet nozzle 1 is located there is a gap 5 for the inlet of a secondary air flow S, 4 clearly shows its representation is.
  • Impeller 2 - not driven by one, for example Electric motor shown - to generate the various Air flows P, S, R with the help of between the front Cover plate 2a and a rear cover plate 2b arranged Paddles 2c rotate about the axis X-X off.
  • the wall 3 of the air inlet nozzle 1 has according to the invention on Perimeter at least one of the blowout section 3b facing away (unspecified) edge of the inflow section 3a spaced disturbance element 6a through the one in the air inlet nozzle 1 located on its wall 3 Boundary layer, in the centrifugal direction the primary air flow P drops in speed, is widened due to air mixing.
  • the Interference element 6a is located in the area of Inflow section 3a of the nozzle wall 3.
  • a second disturbance element 6b with the same effect is located in the area of the blow-out section 3b of the nozzle wall 3. Both the first disturbance element 6a and that second interference element 6b extend in the circumferential direction the wall 3 and are easier to manufacture Formed as embossing (beads).
  • the respective interference element 6a, 6b also by individual, Partial interference elements interrupted in the circumferential direction be formed by knob-like, inward Elevations pointing in the direction of the primary air flow P or Embossments are formed.
  • These pimpled embossments can be both essentially rectangular in their basic shape or circular, as well as elliptical his.
  • interference element 6a, 6b form such that the beginning and end of the disturbance element have an axial offset against each other. This advantageously leads to the essentially in in the radial direction Air mixing in the circumferential direction added.
  • the invention is at a high fan efficiency with structurally simple means on the invention Inlet nozzle 1 achieves effective noise reduction.
  • the invention is not based on the illustrated embodiment limited, but also includes all in For the purposes of the invention, equivalent functions, for example Centrifugal fans without covering the gap between the inlet nozzle 1 and the impeller 2. So the Blowout section 3b of the wall 3 of the air inlet nozzle 1 in protrude the suction opening 4 of the impeller 2, but also close flush with the suction opening 4 or in front of the Intake opening 4 ends.
  • the invention is not yet based on the Claim 1 defined combination of features limited, but can also be by any other combination of certain characteristics of all of the individual characteristics disclosed be defined. This means that basically practically every single feature of claim 1 omitted or by at least one elsewhere in the registration disclosed individual feature can be replaced. To that extent claim 1 only as a first attempt at formulation to understand for an invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Nozzles (AREA)
EP01100089A 2000-02-01 2001-01-11 Ventilateur radial et buse pour ventilateur radial Expired - Lifetime EP1122444B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20001746U DE20001746U1 (de) 2000-02-01 2000-02-01 Radialventilator und Düse für einen Radialventilator
DE20001746U 2000-02-01

Publications (3)

Publication Number Publication Date
EP1122444A2 true EP1122444A2 (fr) 2001-08-08
EP1122444A3 EP1122444A3 (fr) 2003-02-05
EP1122444B1 EP1122444B1 (fr) 2005-03-23

Family

ID=7936693

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01100089A Expired - Lifetime EP1122444B1 (fr) 2000-02-01 2001-01-11 Ventilateur radial et buse pour ventilateur radial

Country Status (3)

Country Link
EP (1) EP1122444B1 (fr)
AT (1) ATE291698T1 (fr)
DE (2) DE20001746U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1479917A1 (fr) * 2003-05-22 2004-11-24 Nidec Shibaura Corporation Ventilateur

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004055023B4 (de) * 2004-11-15 2015-06-25 Siemens Aktiengesellschaft Kühlmittelförderrad mit Injektor-Saugdüse
RU2429386C2 (ru) * 2007-09-26 2011-09-20 Вячеслав Георгиевич Караджи Вентиляторный блок со свободным радиальным рабочим колесом
DE102012021372B4 (de) 2012-10-25 2023-05-04 Ziehl-Abegg Se Einlaufdüse für Radialventilatoren sowie Radialventilator
DE102015207948A1 (de) 2015-04-29 2016-11-03 Ziehl-Abegg Se Einströmdüse für einen Radial-, Diagonal- oder Axialventilator und Radial-, Diagonal- oder Axialventilator mit einer Einströmdüse
DE202016105522U1 (de) 2016-10-05 2016-10-26 Ebm-Papst Mulfingen Gmbh & Co. Kg Einlaufdüse für einen Radialventilator
DE102016118856A1 (de) 2016-10-05 2018-04-05 Ebm-Papst Mulfingen Gmbh & Co. Kg Einlaufdüse für einen Radialventilator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1403081A1 (de) 1958-07-12 1968-10-03 Pollrich Paul & Co Laufrad fuer Radial-Ventilator oder Pumpe
DE2940773A1 (de) 1979-10-08 1981-04-23 Punker GmbH, 2330 Eckernförde Hochleistungs-radialventilator
DE19802111A1 (de) 1997-01-31 1998-08-06 Denso Corp Zentrifugalgebläse mit einer Vielzahl von Nebenschaufeln
EP0769105B1 (fr) 1992-10-01 1999-08-04 Abb Fläkt Ab Cloche d'entree pour ventilateurs centrifuges
DE19903359A1 (de) 1998-02-02 1999-08-05 Denso Corp Zentrifugal-Gebläseeinheit

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1276858B (de) * 1957-03-12 1968-09-05 Paul Pollrich & Comp Radialventilator oder -pumpe
DE3304963A1 (de) * 1983-02-12 1984-08-16 Hans Joachim 7440 Nürtingen Leithner Radailventilator fuer lueftungstechnische anlagen
US5547339A (en) * 1995-04-11 1996-08-20 Comair Rotron, Inc. Turbulator for a fluid impelling device
FR2772437B1 (fr) * 1997-12-11 2000-02-25 Valeo Climatisation Groupe moto-ventilateur, notamment pour installation de chauffage-climatisation de vehicule automobile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1403081A1 (de) 1958-07-12 1968-10-03 Pollrich Paul & Co Laufrad fuer Radial-Ventilator oder Pumpe
DE2940773A1 (de) 1979-10-08 1981-04-23 Punker GmbH, 2330 Eckernförde Hochleistungs-radialventilator
EP0769105B1 (fr) 1992-10-01 1999-08-04 Abb Fläkt Ab Cloche d'entree pour ventilateurs centrifuges
DE19802111A1 (de) 1997-01-31 1998-08-06 Denso Corp Zentrifugalgebläse mit einer Vielzahl von Nebenschaufeln
DE19903359A1 (de) 1998-02-02 1999-08-05 Denso Corp Zentrifugal-Gebläseeinheit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1479917A1 (fr) * 2003-05-22 2004-11-24 Nidec Shibaura Corporation Ventilateur

Also Published As

Publication number Publication date
DE50105660D1 (de) 2005-04-28
EP1122444B1 (fr) 2005-03-23
DE20001746U1 (de) 2001-06-21
ATE291698T1 (de) 2005-04-15
EP1122444A3 (fr) 2003-02-05

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