EP1144870A2 - Ensemble soufflante - Google Patents

Ensemble soufflante

Info

Publication number
EP1144870A2
EP1144870A2 EP00902609A EP00902609A EP1144870A2 EP 1144870 A2 EP1144870 A2 EP 1144870A2 EP 00902609 A EP00902609 A EP 00902609A EP 00902609 A EP00902609 A EP 00902609A EP 1144870 A2 EP1144870 A2 EP 1144870A2
Authority
EP
European Patent Office
Prior art keywords
impeller
housing
blower device
outflow channel
blower
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Withdrawn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
EP00902609A
Other languages
German (de)
English (en)
Inventor
Andreas Klopp
Stefan SCHÄTZL
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.)
MAP Medizintechnik fuer Arzt und Patient GmbH and Co KG
Original Assignee
MAP Medizintechnik fuer Arzt und Patient 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 MAP Medizintechnik fuer Arzt und Patient GmbH and Co KG filed Critical MAP Medizintechnik fuer Arzt und Patient GmbH and Co KG
Publication of EP1144870A2 publication Critical patent/EP1144870A2/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. ventilators; Tracheal tubes
    • A61M16/0057—Pumps therefor
    • A61M16/0066—Blowers or centrifugal pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/10—Geometry two-dimensional
    • F05B2250/15—Geometry two-dimensional spiral
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2250/00—Geometry
    • F05B2250/20—Geometry three-dimensional
    • F05B2250/25—Geometry three-dimensional helical

Definitions

  • the present invention relates to a fan device.
  • the invention relates to a blower device for providing breathing air in a ventilation device, for example a CPAP ventilator.
  • a housing with an inlet and an outlet channel and an impeller are usually provided.
  • the fluid to be compressed or accelerated is sucked in via the inlet channel, compressed in the housing by the impeller driven by a drive device, and discharged via the outlet channel.
  • the impeller is housed concentrically in a cylindrical housing.
  • the outlet channel is formed by a tube section attached to an opening in the cylinder wall of the housing.
  • the problem with the known blower devices is that the noise is relatively large. When using these devices with a low ambient noise level, the noises that occur are often perceived as unpleasant.
  • the invention has for its object to provide a blower device, in particular for a CPAP device, which is characterized by low operating noise.
  • a blower device with a housing, at least one impeller accommodated therein, a suction opening and an outflow channel, a flow path being defined in the housing in cooperation with the impeller, which flow path extends from a first axial level of the housing having the suction opening a step runs into the outflow channel.
  • the impeller in the housing is axially offset from the outflow channel, the housing having a spirally extending wall, so that the fluid accelerated by the impeller flows over a tear-off step or edge.
  • the stage which preferably acts as a stall stage, can be formed directly by the housing.
  • the object specified at the outset is also achieved by a blower device with a housing, at least one impeller accommodated therein, and a drive device for driving the impeller, with a suction area in the housing located upstream of the impeller Intake flow path is defined which extends along a spiral winding path to an intake opening.
  • the housing advantageously has a circumferential wall which follows a spiral path which widens radially in the direction of rotation of the impeller.
  • the spiral path preferably corresponds essentially to a logarithmic spiral.
  • the outflow channel follows a tangential continuation of the spiral path defined in an advantageous manner by the housing.
  • the step projecting into the flow path preferably forms a flow separation edge.
  • the step preferably has a height (H) which corresponds at least to the axial height of the impeller.
  • the flow stopping stage preferably extends between the largest and smallest radius (r max , r min ) of the housing spiral in the running direction of the turbine wheel.
  • the impeller is sunk in a recess and the outflow from the recess into the outflow channel via said overflow edge, which essentially runs at the axial height level of an adjacent peripheral edge of the impeller.
  • the intake opening is advantageously arranged in a base device and the outflow channel is arranged on a side separated by the turbine wheel.
  • a further reduction in running noise can be achieved in an advantageous manner by providing sound insulation means in and / or on the housing, for example in the form of layers of insulation material.
  • the housing is designed as an integral part with integrally molded guide walls.
  • the housing is preferably designed as a plastic injection molded part or aluminum die cast part.
  • extreme smoothness is achieved in that the housing is formed from an elastomeric material, in particular silicone rubber. This advantageously suppresses both sound coupling and sound propagation. In this way, an elastic suspension of the drive device can advantageously be achieved become. This reduces the contribution of vibrations, bearing noise and magnetic effects due to unbalance to the entire running noise spectrum.
  • the impeller is preferably accommodated in a recess, the axial depth (L) of which is greater than the axial depth (t) of the impeller, the recess being limited by a peripheral wall which widens radially in the direction of rotation of the impeller, and in one Transition area to the outflow channel, an outlet opening is provided, which is located at an axial level axially offset from the impeller.
  • the term "blower device” is used here to represent the term “turbine” used in the priority application.
  • the impeller used is preferably a radial or semi-radial impeller.
  • the blades or the channels defined thereby are preferably curved backwards. In the embodiment as a radial impeller, this preferably has blade channel covers on both sides.
  • the impeller is preferably made of a plastic material and coupled to a motor shaft via a snap-in engagement structure, possibly in connection with a press or clamp fit.
  • the impeller can also be screwed to a flange section of the motor via a preferably large-area seat surface.
  • blower device according to the invention is described below using a preferred embodiment in conjunction with the drawing. Show it:
  • FIG. 1 is a perspective view of a housing of a blower device according to the invention (without cover and impeller); 2: a view of the blower device according to the invention with the housing cover removed;
  • Fig. 5 a view of the impeller housing from below with a view of the
  • Fig. 6 a plan view of a cover element for completing the
  • the housing 2 of the blower device is shown as a spatial image.
  • a suction opening 6 which opens into a suction channel (not visible in the figures) on the underside of the housing, through which the fluid to be compressed or accelerated is sucked in.
  • the suction channel formed on the underside of the housing 2 is preferably closed by a cover (not shown) in the assembled state.
  • At least one impeller 8 is provided in the interior of the housing 2 and is driven by a drive device, not shown.
  • the drive device can be provided both inside and outside the housing 2.
  • the impeller 8 has an outer diameter R and rotates around an axis of rotation 10, as shown in FIG. 2.
  • the impeller 8 is provided in the housing in a lower, first axial section 12. In this first axial section, the impeller is surrounded by a peripheral wall, leaving an intermediate space.
  • the housing 2 has an essentially spiral-shaped housing wall 14, which defines the lower, first axial section 12 on the one hand, and a second axial section 16 projecting somewhat beyond it on the other hand.
  • the housing wall 14 of the housing 2 is preferably designed at least in sections in the form of a logarithmic spiral, the following equations applying:
  • the factor k must be selected so that the correct or desired opening angle of the spiral is achieved. To do this, k must be selected from an interval between 0 and 1.
  • the radius R of the impeller 8 is preferably at least 1 mm smaller than the minimum radius r m j n of the housing wall 14.
  • the housing wall 14 opens with respect to the direction of rotation of the impeller 8 along the spiral up to a maximum radius r max . This means that the radial gap formed between the impeller 8 and the housing wall 14 in the impeller direction of rotation starting from minimum radius r min up to the maximum radius r max of the housing wall 14 increases.
  • this tear-off step 20 with the height H defines the axial extent of the first, lowered axial section 12 and the second axial section 16.
  • the height H of the tear-off step 20 preferably corresponds at least to the axial overall depth of the impeller.
  • the flow tear-off stage 20 preferably has a tear-off edge 22. The fluid sucked in and accelerated by the impeller 8 flows along the housing wall 14 via the flow separation stage 20 into an outlet or outflow channel 24.
  • the transition from the actual impeller chamber to the outflow channel 24 is essentially formed by the flow separation stage 20 and a continuation of the spiral outer housing wall 14. This means that the outflow channel 24 or its inlet mouth area is set higher than the impeller 8 by the height H of the demolition step 20.
  • the outflow channel 24 preferably also has a wedge 26 located radially further inwards and an outflow connection 28 with an outlet opening 30.
  • the outlet or outflow channel 24 can preferably also be covered by the cover (not shown) attached to the housing 2.
  • the flow separation stage 20 viewed in the direction of rotation of the impeller 8, extends from the maximum radius r max to the minimum radius r min of the housing wall 14 and preferably has a separation edge 22.
  • the flow stopping stage 20 can, however, also be even longer, ie for example be more curved or start further in the direction opposite to the direction of rotation 18 of the impeller 8.
  • H for example with a height increasing in the direction of rotation 18 of the impeller 8.
  • the housing 2 of the blower device according to the invention is preferably an integral component, such as a plastic injection molded part or an aluminum die cast part.
  • the impeller 8 is preferably designed as a radial wheel, in particular with backward curved blades for accelerating and / or compressing fluids, which can be driven by a drive device, such as an electric motor.
  • the drive device for the impeller can be provided both inside and outside the housing 2.
  • the electric motor can be designed as a brushless motor and possibly sensors, for. B. Hall effect sensors for detecting the speed.
  • Such a soundproofing means is preferably formed from a foam material or a soft material.
  • the recess is delimited by a bottom surface 4, which has the suction opening 6 already mentioned in connection with FIG. 1.
  • the impeller is arranged in the recess in such a way that it is located in an axial region defined between the bottom surface 4 and the axial height level of the tear-off edge 22.
  • a through opening Z In an axial level axially spaced from the impeller there is a through opening Z, through which the conveyed gas can flow out into the outflow channel 24.
  • the gas conveyed by the impeller overflows in order to get into the outflow channel 24, the step 20, or its top tear-off edge 22.
  • the circumferential wall 16 recedes radially outward along a spiral path and in this case merges directly into a corresponding wall section of the outflow channel 24.
  • a sloping wall 34 which also merges into a wall delimiting the outflow channel 24.
  • the housing wall 14 is provided with latching devices 35, 36, via which corresponding complementary cover elements can be latched directly to the housing 2.
  • the axial position of the impeller is determined here by stop elements 37, 38 against which a cover element, which will be explained in more detail below with reference to FIG. 6, strikes.
  • the recess provided for receiving the impeller has almost three times the axial depth L as the impeller 8.
  • the impeller 8 is designed here as a radial impeller and has a Large number of backward curved blade channels.
  • the blade channels are preferably formed with a predetermined unequal division in order to prevent resonance phenomena even further.
  • the inner peripheral wall of the recess can be roughened in order to further increase the sound absorption capacity of this wall. It is also possible to form a multiplicity of micro-projections, which likewise further improves the sound-absorbing behavior of the corresponding wall.
  • FIG. 5 shows a preferred embodiment of the inflow area of the blower device.
  • the inflow to the essentially centrally arranged suction opening 6 takes place along a likewise spiral-shaped suction path X, which is defined by walls formed integrally with the housing 2.
  • the circumferential region of the intake opening 6 pointing toward the inflow side is rounded here, as a result of which a particularly low-noise inflow of the intake air is achieved directly into a central region of the impeller.
  • the wall of the housing 2 delimiting the flow path X is additionally lined with a sound-absorbing foam material, thereby preventing the running noise of the blower device from spreading to the intake duct 39.
  • the wall 40 directly adjacent to the suction opening 6 and delimiting the suction path X is designed so as to be chamfered so that it runs out in the direction of flow towards the base plate 4.
  • FIG. 6 shows a cover element which can be brought into engagement with the latching device identified by reference number 35 in FIG. 4.
  • This cover element 41 is provided with a reinforcement structure formed here by honeycomb-like webs, which on the one hand achieves a sufficiently rigid suspension of the drive device (not shown) and on the other hand suppresses vibrations of the cover element.
  • the cover element 41 has a motor receiving opening 42, which is surrounded by a plurality of claw elements 43, which can enter into a recess provided on the motor side in a latching manner.
  • the cover element has in the embodiment shown here, a radially projecting cover section 44, in which a ramp falling into the outflow channel 24 when the cover element 41 is mounted is defined. In its end immediately adjacent to the outflow section 24, the ramp 45 is designed such that it compensates for the protrusion indicated by the letter s in FIG. 4, so that there is also a substantially smooth inflow with respect to the upper side of the channel.
  • Fig. 7 the flow path of the sucked in gas and conveyed via the impeller is shown again in a highly simplified manner. As can be seen, this flow path runs from the intake duct 39 along a spiral path through the intake opening 6 and overflows the rounded peripheral edge thereof. After passing through the suction opening 6, the flow path extends through the impeller 8 and is then deflected in the axial direction by the circumferential wall 16 or the step 22 and then runs over the tear-off edge 22. Behind the tear-off edge 22, the now under pressure flows Gas along the sloping wall 34 into the outflow channel 24. The inflow into the outflow channel section 24 is also supported by the ramp 45, which is also indicated here and slopes away.
  • the impeller is located within the housing 2 in a first axial section a1, whereas the outflow of the conveyed gas into the outflow channel 24 takes place via an opening area which is located in a second axial section a2.
  • a step 20 is formed in the first axial section a1, which prevents a direct radial outflow of the gas from the impeller 8 into the outflow channel 24.
  • the impeller 8 is thus accommodated in a cup-like recess while leaving a sufficient circumferential gap, in which extensive extinguishing of the flow noises caused by the impeller 8 is achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

L'invention concerne un ensemble soufflante, destiné à être utilisé notamment dans un appareil respiratoire afin d'acheminer un gaz respiratoire. Cet ensemble soufflante comprend un rotor entraîné par une unité d'entraînement et acheminant un gaz respiratoire à un canal d'évacuation (24). Sur le trajet menant à ce canal d'évacuation, le gaz transporté passe par un étage de détachement d'écoulement qui coopère avec une paroi périphérique s'élargissant en forme de spirale pour dévier le gaz sortant directement du rotor radial. L'invention concerne également un appareil de ventilation spontanée en pression positive continue équipé d'un tel ensemble soufflante.
EP00902609A 1999-01-18 2000-01-18 Ensemble soufflante Withdrawn EP1144870A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19901780 1999-01-18
DE19901780A DE19901780C1 (de) 1999-01-18 1999-01-18 Gebläseeinrichtung
PCT/EP2000/000365 WO2000042324A2 (fr) 1999-01-18 2000-01-18 Ensemble soufflante

Publications (1)

Publication Number Publication Date
EP1144870A2 true EP1144870A2 (fr) 2001-10-17

Family

ID=7894621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00902609A Withdrawn EP1144870A2 (fr) 1999-01-18 2000-01-18 Ensemble soufflante

Country Status (5)

Country Link
US (1) US20020056453A1 (fr)
EP (1) EP1144870A2 (fr)
AU (1) AU2438200A (fr)
DE (1) DE19901780C1 (fr)
WO (1) WO2000042324A2 (fr)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4695318B2 (ja) 1999-08-05 2011-06-08 エムアーペー メディツィンテクノロジー ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング 呼気ガスを供給する装置、加湿装置、呼吸用チューブ接続デバイス、呼吸用チューブ及び接続構造
WO2002066106A1 (fr) 2001-02-16 2002-08-29 Resmed Limited Humidificateur dote d'une structure destinee a empecher le refoulement de liquide par l'entree de l'humidificateur
DE10107990A1 (de) * 2001-02-19 2002-08-29 Weinmann G Geraete Med Verfahren und Vorrichtung zur Schalldämmung bei Beatmungsgeräten
DE10123552A1 (de) * 2001-05-15 2002-11-21 Weinmann G Geraete Med Vorrichtung zur Schalldämmung bei Beatmungsgeräten
US8517012B2 (en) 2001-12-10 2013-08-27 Resmed Limited Multiple stage blowers and volutes therefor
DE60239114D1 (de) * 2001-12-10 2011-03-17 Resmed Ltd Gebläsevorrichtung der CPAP/NIPPV-Art
US6910483B2 (en) 2001-12-10 2005-06-28 Resmed Limited Double-ended blower and volutes therefor
FR2843305B1 (fr) * 2002-08-12 2004-10-22 Airtechnologies Sa Dispositif a ventilation centrifuge pour assister un patient dans sa fonction respiratoire, comprenant un element souple d'interposition entre les organes dynamiques et fixes du dispositif
CN100591380C (zh) * 2003-06-10 2010-02-24 雷斯梅德有限公司 多级吹风机及其外壳
US7014422B2 (en) * 2003-06-13 2006-03-21 American Standard International Inc. Rounded blower housing with increased airflow
DE202004021798U1 (de) 2003-06-20 2011-02-10 ResMed Ltd., Bella Vista Atemgasvorrichtung mit Befeuchter
AU2003903139A0 (en) * 2003-06-20 2003-07-03 Resmed Limited Breathable gas apparatus with humidifier
EP1684836A1 (fr) * 2003-11-05 2006-08-02 MAP Medizin-Technologie GmbH Dispositif servant a conduire un gaz a respirer, et structure de guidage d'air placee dans ce dispositif
CN100587804C (zh) * 2006-05-19 2010-02-03 苏州凯迪泰医学科技有限公司 消音装置及应用该消音装置的呼吸机
US8365726B2 (en) 2007-06-07 2013-02-05 Resmed Limited Tub for humidifier
TWI333028B (en) * 2007-08-24 2010-11-11 Delta Electronics Inc Blower
NZ727179A (en) 2008-06-05 2018-06-29 Resmed Ltd Treatment of respiratory conditions
US8931481B2 (en) 2009-06-04 2015-01-13 Redmed Limited Flow generator chassis assembly with suspension seal
DE102017116130A1 (de) * 2017-07-18 2019-01-24 Ka Group Ag Gehäuse für eine Strömungsmaschine, insbesondere für einen Radiallüfter
CN108591124B (zh) * 2018-06-29 2024-06-07 深圳融昕医疗科技有限公司 风机装置及应用该风机装置的呼吸机
CN111561484B (zh) * 2020-06-12 2025-06-13 江苏鱼跃医疗设备股份有限公司 一种消音流道装置
PL440898A1 (pl) * 2022-04-08 2023-10-09 Flowair Głogowski I Brzeziński Spółka Jawna Zespół nawiewny
CN116989011A (zh) * 2023-08-10 2023-11-03 南京舒普思达医疗设备有限公司 一种风机降噪系统
KR102734805B1 (ko) * 2024-03-21 2024-11-27 주식회사 귀뚜라미 범양냉방 원심 팬

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JPH0886299A (ja) * 1994-09-16 1996-04-02 Nippondenso Co Ltd 遠心式送風機
JP3632789B2 (ja) * 1995-08-28 2005-03-23 東陶機器株式会社 多翼遠心ファンの設計方法及び多翼遠心ファン
EP0862474A4 (fr) * 1995-09-18 2000-05-03 Resmed Ltd Regulation de la pression pour ventilation spontanee en pression positive continue ou respiration assistee

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Also Published As

Publication number Publication date
WO2000042324A3 (fr) 2000-12-14
WO2000042324A2 (fr) 2000-07-20
DE19901780C1 (de) 2000-05-25
US20020056453A1 (en) 2002-05-16
AU2438200A (en) 2000-08-01

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