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EP0603665A1 - Unité ventilateur composé d'un moteur et d'un ventilateur - Google Patents

Unité ventilateur composé d'un moteur et d'un ventilateur Download PDF

Info

Publication number
EP0603665A1
EP0603665A1 EP93119877A EP93119877A EP0603665A1 EP 0603665 A1 EP0603665 A1 EP 0603665A1 EP 93119877 A EP93119877 A EP 93119877A EP 93119877 A EP93119877 A EP 93119877A EP 0603665 A1 EP0603665 A1 EP 0603665A1
Authority
EP
European Patent Office
Prior art keywords
support
spacer
blower
shaft
blower unit
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
EP93119877A
Other languages
German (de)
English (en)
Other versions
EP0603665B1 (fr
Inventor
Diethard Dipl.-Ing. Görig (FH)
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.)
BOSCH-SIEMENS HAUSGERAETE GMBH
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0603665A1 publication Critical patent/EP0603665A1/fr
Application granted granted Critical
Publication of EP0603665B1 publication Critical patent/EP0603665B1/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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/164—Multi-stage fans, e.g. for vacuum cleaners
    • 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
    • F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts

Definitions

  • the invention relates to a blower unit consisting of a drive motor and a blower according to the preamble of claim 1.
  • blower unit is known from US-A-3 245 610.
  • the spacer provided between the two blower wheels is designed in the manner of a spool of thread, i.e. it has flanges on both sides that are larger in diameter than the central part connecting them.
  • the fan wheels When the fan wheels are assembled, they are pressed against the outside of the respective flange. The resulting axially directed pressing forces are transmitted from the central part of the spacer. If the outer surfaces of the flanges are not exactly flat, this leads to tension in the flanges, which in turn can result in deformation of the flanges. Such deformations are easily possible because of the relatively large diameter of the flanges compared to the central part of the spacer.
  • the spacers also have a relatively large mass. Since such blower units are operated at high speeds, the large mass of the spacers results in very high vibrational forces even with the smallest imbalances.
  • the invention has for its object to develop a blower unit of the generic type so that deformations caused by tension on the spacer and the resulting misalignment of the impellers are largely avoided.
  • Such a spacer is characterized by a low mass and the forces introduced at the end faces of the webs are transmitted by the webs which extend in the axial direction at a uniform height. Because of the uniform height of the webs, no bending moments resulting in deformation of the webs can occur on them.
  • the centering support can advantageously be designed as a centering ring, from which the inner diameter increases steadily toward the ends of the supporting part.
  • the bore of the support part thus widens from the center to the ends in a conical shape.
  • a further possibility of centering the support part on the shaft of the drive motor is possible by means of three support points arranged at a uniform distance from one another on the inner circumference of the support part. Between the support points and the ends of the support part, the inner diameter of the support part is larger than the diameter of the enveloping circle determined by the free ends of the support points.
  • Such support points can be provided in particular in the case of a support part designed as a stamped and bent part. With such a supporting part, they can easily be produced as body points.
  • centering pad as a centering ring is more likely in a spacer manufactured as an injection molded part.
  • the mass of the spacer can be further reduced by recesses provided in the area between the webs on the sleeve-shaped support part.
  • additional holes can be punched out at the corresponding points during the stamping process.
  • the air flowing in this area between the impeller wheels is entrained and accelerated in the circumferential direction by the webs provided on the support part. This has a favorable effect on the efficiency of the fan.
  • the conveying effect of the webs can be improved in that they are curved in the manner of fan blades in the circumferential direction of the supporting part.
  • the blower 2 is designed as a two-stage blower and has two blower wheels 3 and 4, which are connected in a rotationally fixed manner to the shaft 5 of the drive motor 1.
  • a guide wheel 6 is arranged between the fan wheels 3 and 4, through which the air emerging at the first fan wheel 3 is deflected and fed to the inlet opening 7 of the second fan wheel 4.
  • the constructive embodiment of the spacer 8 can be seen from FIGS.
  • the spacer 8 has a sleeve-shaped support part 12, the inner bore 13 of which is dimensioned in accordance with the diameter of the shaft 5.
  • a centering ring 14 (FIG. 2) is formed in the inner bore 13 as a centering support. Starting from this centering ring 14, the diameter of the inner bore 13 widens towards the two ends of the spacer 8 in a conical shape.
  • webs 15 projecting radially outwards are provided at a uniform circumferential distance 3. The webs 15 extend over the full axial length of the spacer 8.
  • the spacer 8 shown in FIGS. 2 and 3 can advantageously be produced by the injection molding process.
  • the spacer 8 shown in FIGS. 4 and 5 is a stamped and bent part.
  • this spacer 8 has three support points 16 arranged at the same circumferential distance from one another on the inner circumference of the inner bore 13 (FIG. 5). These support points 16 can be produced in a simple manner by means of a punch.
  • the enveloping circle 17 on which the free ends of the support points 16 are smaller than the diameter of the inner bore 13 of the spacer 8.
  • the diameter of the enveloping circle 17 or the centering ring 14 corresponds exactly to the outer diameter of the shaft 5, so that the spacer 8 with its centering seat sits exactly on the shaft 5. Since the diameter of the inner bore 13 outside the respective centering support (centering ring 14 or support points 16) is larger, the spacer 8 can be applied to the shaft 5 without great effort due to the relatively small contact area of its centering support with the shaft 5.
  • the spacer 8 Since the spacer 8 only lies exactly against the shaft in its central region, it can tip over this support point. Angular errors of the end faces of the spacer 8 with respect to its axis can thus be compensated for. This also prevents tensioning between the cover disk 10 of the respective impeller 3 or 4, which abuts against the respective end face of the spacer 8, and the spacer 8.
  • the axial forces are passed through the webs 15 without causing bending stresses in the end region of the webs 15. Since in particular the sleeve-shaped support part 12 is largely relieved of axial forces, it can be made relatively thin-walled and thus the mass of the Spacer 8 are reduced, which has a favorable effect on the vibration behavior of the blower. A further reduction in the mass of the spacer 8 is possible through recesses 18 provided in the area of the sleeve-shaped support part 12 lying circumferentially between the webs 15.
  • the webs 15 Since the spacer rotates together with the impellers 3 and 4, the webs 15 also act like fan blades, by means of which the air is accelerated on its way from the stator 6 to the inlet opening 7 of the second impeller 4. This leads to a significant improvement in fan efficiency.
  • the conveying effect of the webs 15 can be further improved in that they are designed in an aerodynamic shape corresponding to the fan blades.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP93119877A 1992-12-22 1993-12-09 Unité ventilateur composé d'un moteur et d'un ventilateur Expired - Lifetime EP0603665B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4243633 1992-12-22
DE4243633 1992-12-22

Publications (2)

Publication Number Publication Date
EP0603665A1 true EP0603665A1 (fr) 1994-06-29
EP0603665B1 EP0603665B1 (fr) 1996-02-28

Family

ID=6476222

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93119877A Expired - Lifetime EP0603665B1 (fr) 1992-12-22 1993-12-09 Unité ventilateur composé d'un moteur et d'un ventilateur

Country Status (2)

Country Link
EP (1) EP0603665B1 (fr)
DE (1) DE59301728D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0797004A1 (fr) * 1996-03-23 1997-09-24 Pierburg Aktiengesellschaft Pompe à air entraîné par un moteur électrique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245610A (en) * 1964-01-02 1966-04-12 Ametek Inc Motor-fan unit for vacuum cleaners
FR2196681A5 (fr) * 1972-08-18 1974-03-15 Gen Signal Corp
FR2469610A1 (fr) * 1979-11-08 1981-05-22 Paris & Du Rhone Perfectionnements aux elements de machines associes a un arbre tournant, notamment roues de ventilateur

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245610A (en) * 1964-01-02 1966-04-12 Ametek Inc Motor-fan unit for vacuum cleaners
FR2196681A5 (fr) * 1972-08-18 1974-03-15 Gen Signal Corp
FR2469610A1 (fr) * 1979-11-08 1981-05-22 Paris & Du Rhone Perfectionnements aux elements de machines associes a un arbre tournant, notamment roues de ventilateur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0797004A1 (fr) * 1996-03-23 1997-09-24 Pierburg Aktiengesellschaft Pompe à air entraîné par un moteur électrique
US5797727A (en) * 1996-03-23 1998-08-25 Pierburg Ag Impeller mounting for electrically driven air pump to reduce vibration

Also Published As

Publication number Publication date
EP0603665B1 (fr) 1996-02-28
DE59301728D1 (de) 1996-04-04

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