Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
  • A47L5/00—Structural features of suction cleaners
  • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
  • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary 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
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/44—Fluid-guiding means, e.g. diffusers
  • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
  • F04D29/444—Bladed diffusers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
  • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
  • F05D2250/00—Geometry
  • F05D2250/50—Inlet or outlet
  • F05D2250/52—Outlet

Definitions

• the invention relates to an electric motor with a
• 00006 has with a guide vane height and the diffuser
• 00007 has diffuser walls with a diffuser wall height. 00008
• 00019 must be the gap between the impeller and the diffuser inlet
• the channel height is adapted to the 00036 fan wheel outlet height, the duct height in general
• 00037 is chosen 1 - 2 mm larger than the impeller
• the diffuser channels are in the
• the diffuser has curved flows
• Detect 00070 first "pump” process.
• Known measures 00071 are vacuum, preventive or electro-
• 00086 works and has a good efficiency.
• 00087
• diffuser channel extends with a diffuser channel height
• the diffuser channel height is strong in the radial direction
• the training can be chosen so that a first
• 00131 ranges to the guide vane height from 1.7 to 1.2 and to this
• impact vortex 00171 detachment
• the fan wheel is used to support the
• the impact vortex forms a fluid wall that extends
• the diffuser walls are largely in
• the diffuser channel is thus directed flow initially
• 00245 rades extends in front of the tangent and a final one 00246 outer curvature area, from the second part length
• 00258 is angled to the initial length
• 00266 wall tip is preferably at an angle of 10 ° to
• the blade tip can be designed according to the needs
• the diffuser wall be rounded. To be flawless
• blower pot with an inner diameter
• 00324 blades is preferably about 1.2 to 1.6 times
• 00330 may be unequal to the diffuser
• blower unit for example, increased in a vacuum cleaner 00351 can be.
• 00352 "Pumping" does not occur in the entire operating range.
• the blower continues to operate stable up to a 00353 zero flow.
• tonal noise levels are significantly reduced or eliminated by the rotary sound without the support of the blower pot supporting the diffuser walls in terms of stability, e.g. B. te by Ausschnit00357 or the like.
• the diffuser is designed together with the return wheel, which deflects the air to the electric motor for cooling, as a one-piece structure 00360, which can be injection molded from a 00361 polymer material in a simple tool without 00362 slide.
• FIG. 1 shows an electric motor according to the invention with a 00371 impeller and a diffuser radially adjoining the impeller 00372 in a partially cut side view 00373; 00374 00375 FIG. 2 shows a perspective individual illustration of the 00376 diffuser, with a view of diffuser walls; 00377 00378 FIG.
• FIG. 3 shows a further perspective individual illustration 00379 of the diffuser, with a view of rear vanes 00380; 00381 00382
• Figure 4 is a side view of the diffuser.
• Figure 5 is a plan view of the top of the diffuser equipped with diffuser walls 00385;
• 00386 Fig. 6 is a bottom view of the with the remindvant ⁇
• Figure 7 is an enlarged half section of the diffuser.
• FIG. 8 is an enlargement from FIG. 1 in the area
• FIG. 9 shows an enlarged detail from FIG. 4.
• FIG. 10 shows a representation corresponding to FIG. 5,
• 00400- Fig. 1 shows an electric motor 1 with one on a Rotorwel ⁇
• 00403 3 is rotatably arranged on the rotor shaft 2 and will
• the electric motor 1 is from a motor housing 6
• the diffuser 4 is essentially plate-shaped, and 00420 is circular in plan and provided with guide elements arranged on the top and 00421 on the underside. 00422 00423
• the top of the diffuser has 4 diffuser walls 8.
• 00424 Underside of the diffuser support 9, return blades 00425 are integrally formed on the support 9 to form a return wheel 16 material 00426.
• 00427 00428 With reference to the plan shown in FIG. 5, the diffuser 4 has an outer diameter D2, which in 00430 is approximately 108 mm in the exemplary embodiment shown.
• the aforementioned diffuser walls 8 are arranged in a circular 00432-shaped outer region of the diffuser carrier 9 on this 00433, the diffuser walls 8, starting at the diffuser 00434 outer diameter D2 and extending to a 00435 diffuser inner diameter D1, which diffuser 00436 or inner diameter Dl in the exemplary embodiment shown is approximately 94 mm.
• 00438 00439 The circular ring area of the carrier 9, on which the 00440 diffuser walls 8 are arranged, is designed to be thicker in height than a 00441 general carrier plane.
• the blower 00445 wheel 3 is mounted in the installed state (cf. FIG. 1).
• the diffuser 4 00448 has a circular opening 11 in the center for the passage 00449 of a likewise circular center area 00450 of the bearing receiving element 5.
• the 00451 diffuser 4 has two symmetrical 00452 in the area of its support 9 arranged holes 12 for fastening the 00453 diffuser 4 on the bearing receiving element 5 by means of 00454 screws, rivets or the like.
• diffuser channels 13 00457 are formed, with a diffuser channel height greatly expanding in the radial direction.
• This diffuser channel sole 14 extends next to 00462 in a radial inner area parallel to the 00463 total extent of the carrier 9, that is to say perpendicular to the 00464 body axis of the diffuser and thus also perpendicular to the 00465 axis of rotation of the impeller 3.
• the diffuser channel height measured from the diffuser channel base 14 to 00473 to the upper edge of the diffuser walls 8, is greatly expanded in the radial direction 00474, with a diffuse 00476 at the beginning, ie radially inside, in the exemplary embodiment shown or channel height hl of approx. 10.5 mm and a radially outer 00477, ie 00478 height h2 of approx. 12 mm measured in the area of the outer diameter D2.
• the return 00481 blades 10 arranged on the underside of the carrier 9 have a height bl which corresponds to 1.2 00482 to 1.6 times the diffuser wall height b2.
• a diffuser 00484 wall height b2 of 10.5 mm and a return blade height 00485 bl of 12 mm are selected, with a total height b3 of Dif00486 fusor 4 of approximately 27 mm.
• 00487 00488 A total of twenty 00489 diffuser walls 8 are provided on the upper side of the carrier 9 to form diffuser channels 13 00490.
• Each diffuser wall 8 has a largely constant wall thickness w of approximately 1.2 mm.
• 00492 essentially extends the diffuser wall 8 in the radial direction along a tangent T to a circle 00495 defined by 00494 the diffuser inner diameter D1 (cf. FIG. 9).
• 00496 00497 The diffuser wall 8 is composed of a 00499 section Gl, which initially runs essentially straight in the radial 00498 direction, and an adjoining outer 00500 crimping area K, the straight section 00501 de Gl covering approximately 55 to 75% of the total length 1 of the 00502 diffuser wall 8 is, the total length is tapped 1 paral00503 lel to the tangent T.
• the total 00506 length 1 is approximately 25 mm.
• the straight section Gl 00507 has a length of approx. 18 mm.
• 00508 00509 The straight section G1 is composed 00510 of an initial length G2 and a second partial length 00511 G3, the initial length G2 coinciding with the tangent T5. This initial length is about a tenth of 00513 to a fifth of the total length of the straight section 00514, in the embodiment shown, about 4 mm.
• the second 00516 part length G3 which follows this is set back via a bend with an angle 00517 beta of approximately 2 ° against the direction of rotation U of the blower 00518 wheel 3.
• this dimension al is approximately 2.4 mm.
• 00535 00536 The 00537 second distance a2 formed by the angled partial area G3 is 1.02 to 1.25 times the 00538 distance dimension al. In the shown embodiment 00539 this is approximately 2.8 mm.
• 00540 00541 This diffuser wall contour can be easily produced using the injection molding process 00542, is very dimensionally stable and shows significantly less tendency to warp than curved walls.
• 00544 00545 The diffuser wall tip SP is chamfered at an angle gamma 00546 of approx. 10 to 15 °.
• This 00547 design ensures that there is no cross-sectional constriction 00549 at this point in the diffuser channel 00548 13.
• the 00550 diffuser wall tip SP can be rounded with a radius r 00551 for production-oriented design, whereby this radius r is dimensioned with a maximum of a quarter 00552 of the wall thickness w.
• 00553 00554 The return vanes 10 arranged on the underside of the diffuser carrier 9 are also integrally formed on this 00557 in a radial outer area 00556, these being located between a blade outer 00558 outer diameter D3 and a blade inner diameter D4 00559 to form the return wheel 16.
• the outer 00560 diameter D3 lies with its value between the outer and inner diameter D00 and D1 of the diffuser walls 00562 8.
• the 00563 blade outer diameter D3 is approx. 103 mm.
• the inside diameter 00564 D4 of the feedback wheel 16 is approx. 73 mm dimensioned 00565 sen. 00566 00567
• isolated return blades 10 can be provided with randoffe00569 openings 22 on the outside of the wall. This is for example 00570 for assembly reasons.
• 00571 00572 Each return vane 10 has a circular section shape in the plan according to FIG. 6 00573 with a radius of approx.
• 00580 00581 In order to achieve a high air flow rate, in addition to 00582 half of a blade covering Y in the diffuser channel 00583 sole 14, a recess 15 is made between the outer diffuser diameter 00584 D2 and the blade diameter D3 00585, with the fact that the blade outer diameter D3 00586 is approximately corresponds to 0.925 to 0.98 times the outer diameter of the diffuser 00587 D2. 00588 00589 The described diffuser design does not reduce the 00590 cutout 15, nor does it increase the 00591 "pump" risk.
• the return blades 00592 10 since the return blades 00592 10 only start from diameter D3, an opposite 00593 over the diffuser uneven number of blades for the rear 00594 guide wheel 16 can be selected.
• 00595 00596 With reference to FIG. 1, the dimensional ratios of 00597 impeller 3 and diffuser 4 are selected such that the inner 00598 diameter D1 of the diffuser 4 is approximately 1.01 to 1.1 times the outer diameter D5 of the impeller 3 ent00600 speaks.
• the height ratio of the diffuser 00601 wall height b2 to the fan wheel height b4, measured at a 00602 radially outer end, is selected such that the diffuser wall 00603 height b2 corresponds approximately to 1.7 to 2.3 times the fan wheel height 00604 b4. This value is significantly higher than the values given in 00605 prior art.
• 00606 00607 Starting in the diffuser entry area, the Diffus00608 or-channel sole, as already described, is designed with a bevel.
• the 00610 blower pot cover 17 forming the diffuser duct ceiling is perpendicular to the blower axis, 00611, which results in a 00612 diffuser duct 13 which is greatly expanded in the axial direction.
• the entire channel extension 00613 is increased by approximately 2 ° to 10 ° by 00615 due to the flat channel extension between the 00614 adjacent diffuser walls 8.
• 00616 00617 Since cyclical flow separations mark the beginning of the 00618 "pump" range, a bad efficiency and early "pumping" would be expected with such a 00619 greatly expanded diffuser channel 13.
• a flow separation hereinafter referred to as ZI impact swirl, 00623 is used to improve the stability of the flow 00624 and also to prevent "pumping" 00625 from occurring until a flow rate of zero.
• the blower wheel 3 is arranged to support the Einschlagwir00628 lever ZI so that the blower wheel cover wall 18 00629 is flush with the level of the duct cover or the blower pot cover 00630 17 up to 1 to 2 mm and thus 00631 optimal flow from the impeller outlet along the duct 00632 cover or blower pot cover 17.
• the impact vortex 00634 ZI forms a fluid wall I which adjusts itself as a function of the flow through 00635.
• a low-loss deflection of the 00637 main flow to the feedback wheel 16 is achieved.
• the fan wheel 3 is provided with a parallel outlet area 20 00643 formed by the upper 00641 fan wheel cover wall 18 and the fan wheel bottom wall 19 00642 in order to obtain a flow adjacent to the duct ceiling.
• the ratio of the inside diameter D6 of the 00644 outlet area to the outside diameter D5 of the blower 00645 wheel 3 is preferably 0.6 to 0.95.
• the blower guide vanes 21 00648 are arranged in the usual way.
• the blower pot 7 is dimensioned such that 00653 the inner diameter of the blower pot D7 corresponds approximately to 1.035 to 00654 1.075 times the outer diameter of the diffuser D2.
• 00656 00657 The tangential entry area G2 of each diffuser 00658 or wall 8 has the task of redirecting the air flow emerging from the impeller 3 00659 irrespective of the current 00660 angle of flow in the tangential direction.
• the 00661 deflected flow area tears the rest 00662 unaffected flow with.
• the channel width al is dimensioned 00663 so that the entire diffuser channel 13 is flowed almost tangentially.
• 00665 00666
• At lower volume flows than at the optimum point 00667 is provoked by the angulation of the area G2 a detachment 00668 Z2, which is stabilized by the impact vortex ZI, 00669 with which there is a direct connection.
• the detachment area cannot go out of the diffuser channel 00671 13, since the diffuser wall end E is drawn beyond the 00672 tangent T.
• the detachment area Z2 is thus spatially limited and stabilized by the impact vortex 00674 ZI.
• the detachment area Z2 is displaced in 00676 direction onto the impact vortex ZI and the 00677 entire channel width a2 is used.
• 00678 00679 The speed profile of the air flow exiting the fan wheel 3 00680 is inconsistent via the fan wheel part. This constantly changes the An00682 flow angle at the diffuser inlet.
• the new diffuser wall design in accordance with the invention achieves the greatest possible 00684 tangential diffuser channel flow and 00685 the separation area Z2 reacts at low volume flows by growing or shrinking to the different inflow conditions under 00687.
• a slot V can be provided on a diffuser wall or 00693 on two symmetrically opposed diffuser walls 00694 without impairing the noise and efficiency behavior (see FIG. 10).
• 00695 This slot V lies outside the diffuser wall overlap.
• 00696 cover Y and makes it possible to carry out a complete balancing 00697 on the impeller 3.
• 00698 00699 All disclosed features are essential to the invention.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Motor Or Generator Cooling System (AREA)
• Harvester Elements (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Automatic Cycles, And Cycles In General (AREA)
• Iron Core Of Rotating Electric Machines (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=26022947

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Families Citing this family (21)

Family Cites Families (3)

• 1996
  • 1996-02-16 DE DE19605742A patent/DE19605742A1/de not_active Withdrawn
• 1997
  • 1997-03-06 ES ES97914196T patent/ES2187763T3/es not_active Expired - Lifetime
  • 1997-03-06 CZ CZ0300499A patent/CZ297722B6/cs not_active IP Right Cessation
  • 1997-03-06 PL PL97335112A patent/PL183560B1/pl not_active IP Right Cessation
  • 1997-03-06 EP EP97914196A patent/EP0964635B1/fr not_active Expired - Lifetime
  • 1997-03-06 AT AT97914196T patent/ATE231703T1/de not_active IP Right Cessation
  • 1997-03-06 PT PT97914196T patent/PT964635E/pt unknown
  • 1997-03-06 DK DK97914196T patent/DK0964635T3/da active
  • 1997-03-06 JP JP53808398A patent/JP2001513861A/ja active Pending
  • 1997-03-06 WO PCT/EP1997/001139 patent/WO1998038899A1/fr active IP Right Grant
  • 1997-03-06 DE DE59709247T patent/DE59709247D1/de not_active Expired - Fee Related
• 1999
  • 1999-09-02 SK SK1200-99A patent/SK285632B6/sk unknown

Non-Patent Citations (1)

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