WO1999064747A1 - A housing for a centrifugal impeller - Google Patents
A housing for a centrifugal impeller Download PDFInfo
- Publication number
- WO1999064747A1 WO1999064747A1 PCT/AU1999/000444 AU9900444W WO9964747A1 WO 1999064747 A1 WO1999064747 A1 WO 1999064747A1 AU 9900444 W AU9900444 W AU 9900444W WO 9964747 A1 WO9964747 A1 WO 9964747A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- housing
- impeller
- tongue
- sub
- outlet
- Prior art date
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
- F04D29/422—Discharge tongues
-
- 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. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0057—Pumps therefor
-
- 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
-
- 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. mouth-to-mouth respiration; Tracheal tubes
- A61M16/0057—Pumps therefor
- A61M16/0066—Blowers or centrifugal pumps
Definitions
- the present invention relates to a housing for a centrifugal impeller.
- the housing has been primarily developed for use in an apparatus for supplying breathable gas, as is used in the generation of the pressurised gas required for Continuous Positive Airway Pressure (CPAP) treatment of sleep disordered breathing conditions such as Obstructive Sleep Apnea (OSA) syndrome and other ventilatory assistance treatments such as Non Invasive Position Pressure Ventilation
- CPAP Continuous Positive Airway Pressure
- OSA Obstructive Sleep Apnea
- CPAP treatment is a common ameliorative treatment for breathing disorders including OSA.
- CPAP treatment as described in US Patent No. 4,944,310, provides pressurised air or other breathable gas to the entrance of a patient's airways at a pressure elevated above atmospheric pressure, typically in the range 4-20 cm H2O.
- NIPPV is another form of treatment for breathing disorders which can involve a relatively higher pressure of gas being provided in the patient mask during the inspiratory phase of respiration and a relatively lower pressure or atmospheric pressure being provided in the patient mask during the expiratory phase of respiration.
- the pressure can be made to vary in a complex manner throughout the respiratory cycle. For example, the pressure at the mask during inspiration or expiration can be varied through the period of treatment.
- the ventilatory assistance for CPAP or NIPPV treatment is delivered to the patient by way of a nasal mask.
- a mouth mask or full face mask or nasal prongs can be used.
- any reference to a mask is to be understood as incorporating a reference to a nasal mask, mouth mask, full face mask or nasal prongs.
- any reference to CPAP treatment is to be understood as embracing all of the above described forms of ventilatory treatment or assistance.
- An apparatus for supplying breathable gas broadly comprises a flow generator constituted by a continuous source of air or other breathable gas generally in the form of a blower or turbine having a centrifugal impeller driven by an electric motor.
- the gas supply is connected to a conduit or tube, which in turn is connected to a patient mask which incorporates, or has in close proximity, an exhaust to atmosphere for venting exhaled gases.
- the electric motor is typically controlled by a servo-controller under the control of a micro controller unit.
- the above described forms treatment are usually carried out whilst the patient is sleeping. It is thus desirable to minimise the noise produced by the breathable gas supply apparatus, which is generally located within 1 to 2 metres of the patient.
- a common housing for a centrifugal impeller is termed a radial volute which comprises a housing around the impeller having a flow dividing tongue parallel to the rotational axis of the impeller. Starting at the tongue, the housing spirals away from, and around, the impeller to form a duct of increasing area in the plane of the impeller. The tongue splits the flow and thus partially defines the outlet of the housing.
- radial volutes are efficient in terms of the pressure produced relative to flow rate and fan speed, they are extremely noisy as pressure pulses from the blades of the impeller can pass directly into the outlet and create a high frequency scream known as a blade passing tone.
- An alternative design termed a plenum fan housing directs the gas through a slim annular zone between the impeller outlet (ie. the impeller exterior) and the adjacent housing interior and thereafter into a toroidal plenum chamber having a tangential outlet passage. As the plenum chamber and the outlet passage are offset from the impeller outlet, there is no direct path from the impeller outlet to the outlet passage and the plenum fan housing is effective in suppressing the blade passing tone mentioned above.
- a plenum fan housing would produce approximately 20% less pressure than a similar sized motor and impeller using a radial volute fan housing.
- the plenum fan configuration is used in the present applicant's SULLIVAN V and AUTOSET T CPAP machines, Respironic Inc. 's SOLO CPAP machine and Healthdyne Inc. 's QUEST CPAP machine (SULLIVAN V, AUTOSET T, SOLO and QUEST are Trade Marks of their respective companies). It is an object of the present invention to provide a housing for a centrifugal impeller with increased efficiency compared to the prior art plenum fan housing whibt suppressing the blade passing tone.
- the present invention provides a housing for a centrifugal impeller having a flow dividing tongue at least partially defining an outlet from the housing, wherein the tongue is axially displaced from the impeller.
- the tongue has a leading edge extending substantially radially from the rotational axis of the impeller.
- the tongue has a leading edge extending substantially tangentially from the outer periphery of the impeller.
- the tongue comprises a first end of a substantially spiral shaped wall that extends to a second end further axially displaced from the impeller.
- the housing preferably also includes an inlet portion having a central gas inlet disposed adjacent the inlet of the impeller.
- the outlet is preferably a passage of substantially rectangular cross section having one side defined by the tongue.
- the outlet passage is substantially semi-circular or D-shaped in cross section or the like.
- the outlet passage desirably blends into a slightly frustoconical form diverging away from the flow dividing tongue.
- the tongue preferably constitutes the upper side of the outlet.
- the tongue is preferably axially displaced below the lower edge of the impeller.
- the housing is preferably comprised of a first sub-housing including the wall and the outlet passage and a second sub-housing including the gas inlet.
- the first and second sub-housing are preferably joined together after the impeller is installed therebetween.
- the first sub-housing is desirably fastened to an electric motor and includes an opening to allow a drive shaft of the motor to pass through the first sub-housing and engage the impeller.
- Fig. 1 is a side view of a flow generator having a housing according to a first 5 embodiment of the invention with the second sub-housing shown in phantom;
- Fig. 2 is a perspective view of the flow generator shown in Fig. 1 with the second sub-housing removed;
- Fig. 3 is a plan view of the flow generator shown in Fig. 2;
- Fig. 4 is a sectional side view of the flow generator of Fig. 2 along line 4-4 of ⁇ o Fig. 3;
- Fig. 5 is a plan view of the flow generator of Fig. 1 including the second sub-housing;
- Fig. 6 is a sectional side view of the flow generator of Fig. 1 along line 6-6 of Fig. 5; 15 Fig. 7 is a graph showing the noise level produced by flow generators over range of gas supply pressures;
- Fig. 8 is a graph showing the power consumed by flow generators over a range of gas flow rates
- Fig. 9 is a plan view of a first sub-housing according to a second embodiment 20 of the invention.
- Fig. 10 is a sectional side view of the first sub-housing shown in Fig. 9 along line 10-10;
- Fig. 11 is a top plan view of a first sub-housing according to a third embodiment of the invention. and 25 Fig. 12 is a top isometric view of the first sub-housing shown in Fig. 11.
- FIG. 1 there is shown an embodiment according to the present invention of a housing 10 for a centrifugal impeller 12.
- the impeller 12 has a central gas inlet 13, blades 14 and is mounted on a drive shaft 15 (see Fig. 6) of an
- the housing 10 is comprised of a first sub-housing 18 and a second sub-housing 20 which is shown in phantom in Fig. 1.
- the first sub-housing 18 includes a flow dividing tongue 22 having a leading edge 23 which at least partially defines an outlet 24 from the housing 10.
- the outlet 24 is a passage of rectangular cross-section and the tongue 22 defines the upper side or roof of the outlet passage 24.
- the leading edge 23 of the tongue 22 is oriented radially from the rotational axis 26 of the impeller and, as best shown in Fig. 6, is axially displaced from the impeller 12 along the axis 26.
- the impeller 12 has a bottom edge 28 and the tongue 22 is axially displaced below the bottom edge 28.
- the tongue 22 is at the end of a substantially spiral shaped floor or wall 30 which extends through approximately 360° from a first end having the tongue 22, which is displaced slightly below the bottom edge 28 of the impeller 12, to a second end 31 displaced further from the bottom edge 28 and below the first end or tongue 22.
- the end 31 of the wall 30 defines the floor of the rectangular outlet passage 24.
- the outlet passage 24 blends from the rectangular cross-section into a slightly frustoconical outlet duct 32 diverging away from the flow dividing tongue 22.
- the leading edge 23 of the tongue 22 is tapered or sharpened to minimise disturbance of the gas entering the outlet 24.
- the second sub-housing 20 includes a central gas inlet 34 which is disposed adjacent the inlet 13 of the impeller 12.
- the first sub-housing 18 is fastened to the motor 16 and includes an opening 38 (see Fig. 6) to allow the motor drive shaft 15 to pass through the first sub-housing 18 and engage an inner hub 39 of the impeller 12.
- the second sub-housing 20 is glued or ultrasonically welded to the first sub-housing 18 at matching shoulders 41 to form the housing 10.
- the gas outlet of the impeller 12 is defined by the outermost edges 40 of the blades 13.
- the blade edges 40 are adjacent a substantially annular zone 42 between the edges 40 and an external side wall 44 of the second sub-housing 20.
- a tapered spiralling substantially annular zone 46 is defined between internal and external walls 48 and 50 of the first sub-housing 18 and the spiral floor 30.
- energising the motor 16 rotates the impeller 12 and draws gas through the impeller inlet 13 and forces it centrifugally out of the impeller 12 from the blade edges 40.
- the pressurised gas is initially forced into the zone 42.
- the gas is also forced into the zone 46 above the spiral wall 30 which causes it to be gradually slowed in the zones 42 and 46, thereby minimising pressure losses, until an outlet stream of gas is separated by the offset flow dividing tongue 22 and exits the housing 10 through the outlet duct 32 via the outlet passage 24.
- the housing 10 suppresses the blade passing tone as there is no direct path for pressure pulses leaving the blades edges 40 of the impeller 12 directly into the outlet passage 24. Further, the gradual slowing of the gas and the lack of any slim annular zone through which the gas is forced results in lower pressure losses and thus higher pressure generation than the prior art plenum fan design.
- Figs. 7 and 8 are plots of characteristics of the housing 10 of the preferred embodiment compared to a radial volute housing and a plenum fan housing of comparable size.
- the housing 10 is represented by line 52, the radial volute housing by line 54 and the plenum fan housing by line 56.
- Fig. 7 is a plot of sound pressure (dBA) levels emitted by the housings over a range of gas outlet pressures (cm H 2 O) discharging through a fixed orifice and shows that the housing 10 produces noise comparable to the plenum fan housing and lower, and thus superior, to the radial volute. Further, the housing 10 does not exhibit the noise level spike between 13 and 17 cm H2O created by the blade passing tone in the radial valute housing.
- Fig. 8 is a plot of power usage (W) of the housings over a range of gas flow rates ⁇ £ /min) and shows that the housing 10 uses power comparable to the radial volute housing and lower, and thus superior, to the plenum fan housing.
- Figs. 9 and 10 show a second embodiment of the first sub-housing 18 having a semi-circular wall 30 that, in combination with the tongue 22, defines a substantially D- shaped outlet passage 24 and annular zone 46.
- the cross section of the floor or wall 30 gradually curves from being straight at its first end, which comprises the tongue 22, to semi-circular at its second end 31 as it extends through its 360° path around the impeller 12.
- Figs. 11 and 12 show a third embodiment of a first sub-housing 18 in which the leading edge 23 of the flow dividing tongue 22 is oriented substantially tangentially from the periphery of the impeller 12.
- the upper side or roof of the outlet 24 is formed in the wall 58 of the first sub-housing 18.
- the housings according to the preferred embodiments of the invention are advantageous because they produce less noise than the radial volute housing whilst having a power usage comparable to the radial volute housing but lower, and thus superior, power usage (i.e. efficiency) to the plenum fan housing.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU42508/99A AU4250899A (en) | 1998-06-11 | 1999-06-09 | A housing for a centrifugal impeller |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPP4070A AUPP407098A0 (en) | 1998-06-11 | 1998-06-11 | A housing for a centrifugal impeller |
AUPP4070 | 1998-06-11 | ||
AUPP7883A AUPP788398A0 (en) | 1998-12-22 | 1998-12-22 | A housing for a centrifugal impeller ii |
AUPP7883 | 1998-12-22 |
Publications (1)
Publication Number | Publication Date |
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WO1999064747A1 true WO1999064747A1 (en) | 1999-12-16 |
Family
ID=25645802
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1999/000444 WO1999064747A1 (en) | 1998-06-11 | 1999-06-09 | A housing for a centrifugal impeller |
Country Status (1)
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WO (1) | WO1999064747A1 (en) |
Cited By (23)
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---|---|---|---|---|
FR2853021A1 (en) * | 2003-03-28 | 2004-10-01 | Woco Industrietechnik Gmbh | Radial compressor housing section e.g. for vehicle engine turbocharger has cavity or space aligning with similar one in second section to which it is fixed |
CN101092974B (en) * | 2006-06-19 | 2010-05-12 | 高其海 | Spiral case of centrifugal type fluids machinery |
CN101818746A (en) * | 2009-02-27 | 2010-09-01 | 德昌电机(深圳)有限公司 | Premixing boiler fan |
DE202004021774U1 (en) | 2003-06-20 | 2010-11-18 | ResMed Ltd., Bella Vista | Breathing apparatus with humidifier |
US7862298B2 (en) | 2006-02-27 | 2011-01-04 | Woco Industrietechnik Gmbh | Centrifugal compressor housing |
US7866944B2 (en) | 2006-05-24 | 2011-01-11 | Resmed Motor Technologies Inc | Compact low noise efficient blower for CPAP devices |
EP2287471A1 (en) * | 2001-12-10 | 2011-02-23 | ResMed Limited | Blower apparatus of the CPAP/NIPPV type |
US8122884B2 (en) | 2001-12-10 | 2012-02-28 | Resmed Limited | Double-ended blower and volutes therefor |
US8342800B2 (en) | 2007-02-27 | 2013-01-01 | Woco Industrietechnik Gmbh | Plastic compressor housing and method for producing same |
US8419359B2 (en) | 2007-06-11 | 2013-04-16 | Woco Industrietechnik Gmbh | Plastic compressor housing and method for producing a plastic compressor housing |
USRE44453E1 (en) | 2001-02-16 | 2013-08-27 | Resmed Limited | Humidifier with structure to prevent backflow of liquid through the humidifier inlet |
US8622057B2 (en) | 2001-02-16 | 2014-01-07 | Resmed Ltd | Methods and apparatus for supplying clean breathable gas |
FR2999250A1 (en) * | 2012-12-12 | 2014-06-13 | Thy Engineering | Body for e.g. centrifugal compressor, used in e.g. heat engine, has outlet duct provided in continuity of volute and extending tangentially to annular inlet of volute, and tongue provided at junction of volute and outlet duct |
US8789525B2 (en) | 2007-06-07 | 2014-07-29 | Resmed Limited | Tub for humidifier |
US8973576B2 (en) | 2009-11-19 | 2015-03-10 | Resmed Motor Technologies Inc | Blower |
US9272116B2 (en) | 1999-08-05 | 2016-03-01 | Resmed R&D Germany Gmbh | Apparatus for humidifying a respiratory gas |
US9427538B2 (en) | 2001-12-10 | 2016-08-30 | Resmed Limited | Multiple stage blowers and volutes therefor |
EP3076023A1 (en) * | 2015-03-30 | 2016-10-05 | Nidec Corporation | Centrifugal fan |
WO2017018881A1 (en) * | 2015-07-24 | 2017-02-02 | Intergas Heating Assets B.V. | Centrifugal fan and heating device provided therewith |
US9610416B2 (en) | 2009-06-04 | 2017-04-04 | Resmed Limited | Flow generator chassis assembly with suspension seal |
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1999
- 1999-06-09 WO PCT/AU1999/000444 patent/WO1999064747A1/en active Application Filing
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