US20090291004A1 - Fan for an apparatus for the regulated delivery of a gas, in particular oxygen - Google Patents
Fan for an apparatus for the regulated delivery of a gas, in particular oxygen Download PDFInfo
- Publication number
- US20090291004A1 US20090291004A1 US12/519,986 US51998607A US2009291004A1 US 20090291004 A1 US20090291004 A1 US 20090291004A1 US 51998607 A US51998607 A US 51998607A US 2009291004 A1 US2009291004 A1 US 2009291004A1
- Authority
- US
- United States
- Prior art keywords
- fan
- compartment
- volute
- motor
- shaft
- 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.)
- Abandoned
Links
Images
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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
-
- 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
-
- 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
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
-
- 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
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
- A61M16/122—Preparation of respiratory gases or vapours by mixing different gases with dilution
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
-
- 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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
- F04D29/104—Shaft sealings especially adapted for elastic fluid pumps the sealing fluid being other than the working fluid or being the working fluid treated
-
- 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
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/136—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas explosion-proof
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/14—Arrangements for cooling or ventilating wherein gaseous cooling medium circulates between the machine casing and a surrounding mantle
-
- 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
- A61M2202/00—Special media to be introduced, removed or treated
- A61M2202/02—Gases
- A61M2202/0208—Oxygen
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/36—General characteristics of the apparatus related to heating or cooling
- A61M2205/3606—General characteristics of the apparatus related to heating or cooling cooled
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/36—General characteristics of the apparatus related to heating or cooling
- A61M2205/362—General characteristics of the apparatus related to heating or cooling by gas flow
-
- 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
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/602—Drainage
- F05D2260/6022—Drainage of leakage having past a seal
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- the present invention relates to a fan used in an apparatus for the regulated delivery of a gas, in particular oxygen.
- This apparatus may especially be a respiratory assistance apparatus.
- a fan delivering gases other than air, especially oxygen conventionally comprises a volute whose inlet opening is in communication with the oxygen feed line, an impeller situated immediately downstream of this inlet opening and comprising an inlet opening connected to this inlet opening of the volute and outlet orifices emerging into the volute, and an electric motor for rotating the impeller.
- the rotation of the impeller generates a centrifugal oxygen flow which is converted into increased gas pressure in the volute.
- the main objective of the invention is to solve this problem under the best conditions.
- Another objective of the invention is to overcome this problem under the best conditions, in combination with tackling the aforementioned leakage problem.
- the fan in question comprises, in a manner known per se, a volute whose inlet opening is in communication with the oxygen feed line, an impeller situated immediately downstream of the inlet opening of the volute and comprising an inlet opening connected to this inlet opening of the volute and outlet orifices emerging into the volute, and an electric motor for rotating the impeller.
- the fan comprises:
- the motor and any other electric elements or components of the fan are placed in a compartment containing pressurized air, this air flowing out of this compartment through the gap which necessarily exists between the shaft of the motor and the said end wall.
- This flow of pressurized air makes it possible to oppose the ingress into the compartment of pressurized oxygen flowing through the gap which necessarily exists between the shaft of the motor and the wall of the volute that is traversed by this shaft.
- the shaft of the motor comprises at least one deflector member for separating the respective air and oxygen flows and for orienting these flows, on leaving the said gaps, in directions which are substantially perpendicular to the shaft of the motor.
- the air flowing into the compartment can be advantageously pressurized by an impeller arranged opposite the air inlet opening belonging to this compartment.
- this impeller is arranged on the drive shaft for the impeller situated in the volute. It is therefore driven by the same motor.
- the walls defining the compartment can comprise one or more openings emerging directly into the said collection chamber.
- This opening or these openings allow a flow of pressurized air around the motor and then into the collection chamber, thereby making it possible to cool the motor.
- the flow of this air into the collection chamber additionally allows a rapid discharge of the mixture of air and oxygen present in this chamber.
- the compartment comprises an internal transverse wall which is distinct from the aforementioned end wall and which is perforated by at least one hole for the flow of air across this wall.
- This internal transverse wall and this end wall thus define between them a secondary air flow chamber, and the hole or holes belonging to the said internal transverse wall optimize the pressurization of this secondary chamber so as to allow the leak at the said gap to occur under the best conditions.
- This leakage rate thus remains effective, using the relatively high air pressure created in the secondary chamber.
- the said internal transverse wall can in particular be formed integrally with other walls defining the compartment and serve to centre the motor in this compartment.
- the said end wall can be composed of a thin plate.
- the wall of the volute that is traversed by the shaft of the motor can also be composed of a thin plate adapted to the precision required for obtaining a small clearance at the level of the said gap situated where the shaft passes into the volute wall.
- the leaks collected by the collection chamber can be purely and simply discharged, or can be recycled, in which case the discharge orifice of the collection chamber can be connected directly to the oxygen feed line.
- the collection chamber is advantageously divided into two adjoining subchambers, one of which, situated adjacent to the volute, is mainly intended to collect the flow of oxygen coming from this volute and the other of which, situated adjacent to the said compartment, is mainly intended to collect the flow of air coming from this compartment, each subchamber comprising a discharge orifice which is specific to it.
- the subchamber situated adjacent to the volute mainly collects the oxygen flow, which can be recycled by placing the discharge orifice belonging to this subchamber in communication with the oxygen feed line.
- FIG. 1 is a view in axial section thereof, according to a first embodiment
- FIG. 2 is a detail view thereof, on an enlarged scale
- FIG. 3 is a view in axial section thereof, similar to FIG. 1 , according to a second embodiment
- FIG. 4 is a detail view thereof, on an enlarged scale, according to this second embodiment
- FIG. 5 is a view in axial section thereof, similar to FIG. 1 , according to a third embodiment.
- FIG. 6 is a detail view thereof, on an enlarged scale, according to this third embodiment.
- FIGS. 1 and 2 represent a fan 1 used in an apparatus for the regulated delivery of a gas, in particular oxygen, it being possible especially for this apparatus to be a respiratory assistance apparatus.
- the fan 1 conventionally comprises a volute 2 whose inlet opening 3 is in communication with an oxygen feed line (not shown in this figure), an impeller 4 situated immediately downstream of this inlet opening 3 and comprising an inlet opening connected to this opening 3 and outlet orifices 4 a emerging into the volute 2 , and an electric motor 5 for rotating the impeller 4 .
- the bottom of the volute 2 is defined by a wall composed of a thin plate 2 a traversed by the shaft of the motor 5 . There is a gap between this shaft and this plate 2 a , through which pressurized oxygen contained in the volute 2 inevitably flows.
- the fan 1 also comprises a compartment 6 and a leak collection chamber 7 .
- the compartment 6 contains the motor 5 and also, where appropriate, other electric elements or components belonging to the fan 1 . It comprises an air inlet 10 , a number of openings 11 emerging directly into the collection chamber 7 , a transverse wall 12 and an end wall 13 .
- the air inlet 10 is situated on that end of the compartment 6 which is opposed to the volute 2 , and is coaxial with the shaft of the motor 5 including the impeller 4 .
- the fan 1 comprises an impeller 15 , smaller than the impeller 4 , arranged on an extension of the shaft of the motor 5 which includes the impeller 4 .
- this impeller 15 makes it possible to create a pressurized air circulation in the compartment 6 ; this air passes into the collection chamber 7 , for the most part through openings 11 , and for the minor part through holes 16 belonging to the wall 12 and through the gap which exists between the hub of a deflector member 17 belonging to the shaft of the motor 5 and the end wall 13 .
- the openings 11 are formed in the peripheral wall defining the compartment 6 , perpendicularly to the shaft of the motor 5 .
- the transverse wall 12 is formed integrally with this peripheral wall and serves to centre the motor 5 in the compartment 6 .
- the end wall 13 for its part is composed of a thin plate.
- This wall 13 is fastened to a rim belonging to the fan 1 in the continuation of the peripheral wall defining the compartment 6 , such that it is located at a distance from the wall 12 and such that it defines a secondary air flow chamber therewith.
- the holes 16 belonging to the transverse wall 12 optimize the pressurization of this secondary chamber so as to allow an air leak at the aforementioned gap.
- the collection chamber 7 is situated between the volute 2 and the compartment 6 , encompassing the upper part thereof. It is traversed by the shaft of the motor 5 and includes a discharge orifice 20 .
- the deflector member 17 comprises, in addition to the aforementioned hub which serves to mount it on the shaft of the motor 5 , a part in the form of a flange formed integrally with this hub. As is shown more particularly in FIG. 2 , this deflector member 17 makes it possible to separate the respective air and oxygen flows coming from the aforementioned respective gaps and to orient these flows, on leaving the said gaps, in directions which are substantially perpendicular to the shaft of the motor 5 .
- the air flowing out of the compartment 6 through the gap which exists between the shaft of the motor 5 and the end wall 13 makes it possible to oppose the ingress into the compartment 6 of pressurized oxygen flowing through the gap which exists between the shaft of the motor 5 and the wall 2 a of the volute 2 that is traversed by this shaft.
- These respective air and oxygen leaks are collected in the chamber 7 and can be discharged by simply flowing through the discharge orifice 20 belonging thereto.
- the deflector member 17 makes it possible to eliminate the disturbances between these flows.
- the impeller 15 makes it possible to achieve a forced circulation of pressurized air around the motor 5 , thereby providing good cooling for the latter.
- the flow of this air into the collection chamber 7 additionally allows a rapid discharge of the mixture of air and oxygen present in this chamber.
- FIGS. 3 and 4 represent an apparatus 1 similar to the one which has just been described apart from the fact that, in this case, the orifices 11 emerge into a chamber 25 separated from the collection chamber 7 .
- the latter is limited to the region included between the wall 2 a defining the bottom of the volute 2 , the end wall 13 and walls 26 formed by the body of the apparatus 1 , joining that part of the compartment 6 situated adjacent to the volute 2 to the peripheral wall defining the chamber 7 .
- the discharge orifice 20 belonging to the collection chamber 7 is in communication, via a pipe 27 , with the oxygen feed line 28 .
- the mixture of air and oxygen flowing through the aforementioned gaps is thus recycled in the oxygen circuit.
- FIGS. 5 and 6 represent an apparatus 1 in which the collection chamber 7 is divided into two adjoining subchambers 7 a , 7 b , one, 7 a , of which is defined by the wall 2 a of the volute 2 and by an intermediate wall 30 , and the other, 7 b , of which is defined by the intermediate wall 30 and by a peripheral wall 31 attaching to the compartment 6 .
- the subchamber 7 a is mainly intended for collecting the oxygen flow coming from the volute 2
- the subchamber 7 b is mainly intended for collecting the air flow coming from the compartment 6 .
- Each subchamber 7 a , 7 b comprises a discharge orifice 20 a , 20 b which is specific to it, that of the subchamber 7 a being connected, by a pipe 27 , to the oxygen feed line 28 . Virtually pure oxygen is thus recycled in the oxygen circuit.
- the invention therefore provides a fan 1 which makes it possible under the best conditions to solve the problem of oxygen leakage in the direction of the motor 5 , oxygen penetration not being acceptable on account of the risk of ignition which could result therefrom, and to simultaneously solve the problem of cooling the motor, this motor being subject to significant heating on account of its high speed of rotation.
Abstract
This fan (1) includes a volute (2) whose inlet opening (3) is in communication with the oxygen feed line, an impeller (4) situated immediately downstream of the inlet opening of the volute and including an inlet opening connected to this inlet opening (3) of the volute and outlet orifices (4 a) emerging into the volute (2), and an electric motor (5) for rotating the impeller (4). The fan (1) includes: —a compartment (6) in which the motor (5) and, where appropriate, other electric elements or components belonging to the fan (1) are placed, this compartment (6) including an end wall (13) traversed by the shaft of the motor (5) and being supplied with pressurized air, and—a leak collection chamber (7) situated intermediately between the volute (2) and the compartment (6), this chamber likewise being traversed by the shaft of the motor (5) and including a discharge orifice (20).
Description
- The present invention relates to a fan used in an apparatus for the regulated delivery of a gas, in particular oxygen. This apparatus may especially be a respiratory assistance apparatus.
- A fan delivering gases other than air, especially oxygen, conventionally comprises a volute whose inlet opening is in communication with the oxygen feed line, an impeller situated immediately downstream of this inlet opening and comprising an inlet opening connected to this inlet opening of the volute and outlet orifices emerging into the volute, and an electric motor for rotating the impeller.
- The rotation of the impeller generates a centrifugal oxygen flow which is converted into increased gas pressure in the volute.
- There is a major problem in this type of fan of oxygen leaking in the direction of the electric motor through the gap which necessarily exists between the shaft of the motor and the wall of the volute that is traversed by this shaft. Oxygen penetration in the direction of the motor or other electric elements or components of the apparatus resulting from such a leak is not acceptable on account of the risk of ignition which could result therefrom; moreover, the standards of a certain number of countries prohibit the presence of oxygen in a proportion of more than 26% in those regions of a medical apparatus that include electric circuits.
- The main objective of the invention is to solve this problem under the best conditions.
- There is also a problem of cooling the electric motor in the existing fans, this motor being subject to significant heating on account of its high speed of rotation.
- Another objective of the invention is to overcome this problem under the best conditions, in combination with tackling the aforementioned leakage problem.
- The fan in question comprises, in a manner known per se, a volute whose inlet opening is in communication with the oxygen feed line, an impeller situated immediately downstream of the inlet opening of the volute and comprising an inlet opening connected to this inlet opening of the volute and outlet orifices emerging into the volute, and an electric motor for rotating the impeller.
- According to the invention, the fan comprises:
-
- a compartment in which the motor and, where appropriate, other electric elements or components belonging to the fan are placed, this compartment comprising an end wall traversed by the shaft of the motor and being supplied with pressurized air, and
- a leak collection chamber situated intermediately between the volute and the said compartment, this chamber likewise being traversed by the shaft of the motor and including a discharge orifice.
- Thus, the motor and any other electric elements or components of the fan are placed in a compartment containing pressurized air, this air flowing out of this compartment through the gap which necessarily exists between the shaft of the motor and the said end wall. This flow of pressurized air makes it possible to oppose the ingress into the compartment of pressurized oxygen flowing through the gap which necessarily exists between the shaft of the motor and the wall of the volute that is traversed by this shaft.
- These respective air and oxygen leaks are collected in the collection chamber and can be discharged by simply flowing through a discharge orifice belonging to this collection chamber.
- Preferably, the shaft of the motor comprises at least one deflector member for separating the respective air and oxygen flows and for orienting these flows, on leaving the said gaps, in directions which are substantially perpendicular to the shaft of the motor.
- Disturbances between these flows are thus eliminated, and the risk of oxygen penetrating into the compartment is also reduced, notwithstanding the pressure of the oxygen flow, which is substantially higher than that of the air flow.
- The air flowing into the compartment can be advantageously pressurized by an impeller arranged opposite the air inlet opening belonging to this compartment. Advantageously, in this case, this impeller is arranged on the drive shaft for the impeller situated in the volute. It is therefore driven by the same motor.
- The walls defining the compartment can comprise one or more openings emerging directly into the said collection chamber.
- This opening or these openings allow a flow of pressurized air around the motor and then into the collection chamber, thereby making it possible to cool the motor. The flow of this air into the collection chamber additionally allows a rapid discharge of the mixture of air and oxygen present in this chamber.
- Preferably, the compartment comprises an internal transverse wall which is distinct from the aforementioned end wall and which is perforated by at least one hole for the flow of air across this wall.
- This internal transverse wall and this end wall thus define between them a secondary air flow chamber, and the hole or holes belonging to the said internal transverse wall optimize the pressurization of this secondary chamber so as to allow the leak at the said gap to occur under the best conditions. This leakage rate thus remains effective, using the relatively high air pressure created in the secondary chamber.
- The said internal transverse wall can in particular be formed integrally with other walls defining the compartment and serve to centre the motor in this compartment.
- The said end wall can be composed of a thin plate.
- With the same aim, the wall of the volute that is traversed by the shaft of the motor can also be composed of a thin plate adapted to the precision required for obtaining a small clearance at the level of the said gap situated where the shaft passes into the volute wall.
- The leaks collected by the collection chamber can be purely and simply discharged, or can be recycled, in which case the discharge orifice of the collection chamber can be connected directly to the oxygen feed line.
- In this same case of recycling the collected leaks, the collection chamber is advantageously divided into two adjoining subchambers, one of which, situated adjacent to the volute, is mainly intended to collect the flow of oxygen coming from this volute and the other of which, situated adjacent to the said compartment, is mainly intended to collect the flow of air coming from this compartment, each subchamber comprising a discharge orifice which is specific to it.
- Thus, the subchamber situated adjacent to the volute mainly collects the oxygen flow, which can be recycled by placing the discharge orifice belonging to this subchamber in communication with the oxygen feed line.
- The invention will be properly understood and other features and advantages thereof will become apparent with reference to the appended schematic drawing which represents, by way of non-limiting examples, a number of possible embodiments of the apparatus to which it relates.
-
FIG. 1 is a view in axial section thereof, according to a first embodiment; -
FIG. 2 is a detail view thereof, on an enlarged scale; -
FIG. 3 is a view in axial section thereof, similar toFIG. 1 , according to a second embodiment; -
FIG. 4 is a detail view thereof, on an enlarged scale, according to this second embodiment; -
FIG. 5 is a view in axial section thereof, similar toFIG. 1 , according to a third embodiment; and -
FIG. 6 is a detail view thereof, on an enlarged scale, according to this third embodiment. - For reasons of simplification, those parts or elements of one embodiment which reappear in an identical or similar manner in another embodiment are designated by the same reference numbers and are not described again.
-
FIGS. 1 and 2 represent afan 1 used in an apparatus for the regulated delivery of a gas, in particular oxygen, it being possible especially for this apparatus to be a respiratory assistance apparatus. - The
fan 1 conventionally comprises avolute 2 whoseinlet opening 3 is in communication with an oxygen feed line (not shown in this figure), animpeller 4 situated immediately downstream of this inlet opening 3 and comprising an inlet opening connected to this opening 3 andoutlet orifices 4 a emerging into thevolute 2, and anelectric motor 5 for rotating theimpeller 4. - The bottom of the
volute 2 is defined by a wall composed of athin plate 2 a traversed by the shaft of themotor 5. There is a gap between this shaft and thisplate 2 a, through which pressurized oxygen contained in thevolute 2 inevitably flows. - As is represented, the
fan 1 also comprises acompartment 6 and aleak collection chamber 7. - The
compartment 6 contains themotor 5 and also, where appropriate, other electric elements or components belonging to thefan 1. It comprises anair inlet 10, a number ofopenings 11 emerging directly into thecollection chamber 7, atransverse wall 12 and anend wall 13. - The
air inlet 10 is situated on that end of thecompartment 6 which is opposed to thevolute 2, and is coaxial with the shaft of themotor 5 including theimpeller 4. Immediately downstream of thisinlet 10, thefan 1 comprises animpeller 15, smaller than theimpeller 4, arranged on an extension of the shaft of themotor 5 which includes theimpeller 4. - As will be understood, the rotation of this
impeller 15 by themotor 5 makes it possible to create a pressurized air circulation in thecompartment 6; this air passes into thecollection chamber 7, for the most part throughopenings 11, and for the minor part throughholes 16 belonging to thewall 12 and through the gap which exists between the hub of adeflector member 17 belonging to the shaft of themotor 5 and theend wall 13. - In this illustrated example, the
openings 11 are formed in the peripheral wall defining thecompartment 6, perpendicularly to the shaft of themotor 5. - The
transverse wall 12 is formed integrally with this peripheral wall and serves to centre themotor 5 in thecompartment 6. - The
end wall 13 for its part is composed of a thin plate. Thiswall 13 is fastened to a rim belonging to thefan 1 in the continuation of the peripheral wall defining thecompartment 6, such that it is located at a distance from thewall 12 and such that it defines a secondary air flow chamber therewith. Theholes 16 belonging to thetransverse wall 12 optimize the pressurization of this secondary chamber so as to allow an air leak at the aforementioned gap. - The
collection chamber 7 is situated between thevolute 2 and thecompartment 6, encompassing the upper part thereof. It is traversed by the shaft of themotor 5 and includes adischarge orifice 20. - The
deflector member 17 comprises, in addition to the aforementioned hub which serves to mount it on the shaft of themotor 5, a part in the form of a flange formed integrally with this hub. As is shown more particularly inFIG. 2 , thisdeflector member 17 makes it possible to separate the respective air and oxygen flows coming from the aforementioned respective gaps and to orient these flows, on leaving the said gaps, in directions which are substantially perpendicular to the shaft of themotor 5. - As is apparent from the foregoing, the air flowing out of the
compartment 6 through the gap which exists between the shaft of themotor 5 and theend wall 13 makes it possible to oppose the ingress into thecompartment 6 of pressurized oxygen flowing through the gap which exists between the shaft of themotor 5 and thewall 2 a of thevolute 2 that is traversed by this shaft. These respective air and oxygen leaks are collected in thechamber 7 and can be discharged by simply flowing through thedischarge orifice 20 belonging thereto. - The
deflector member 17 makes it possible to eliminate the disturbances between these flows. - Moreover, the
impeller 15 makes it possible to achieve a forced circulation of pressurized air around themotor 5, thereby providing good cooling for the latter. The flow of this air into thecollection chamber 7 additionally allows a rapid discharge of the mixture of air and oxygen present in this chamber. -
FIGS. 3 and 4 represent anapparatus 1 similar to the one which has just been described apart from the fact that, in this case, theorifices 11 emerge into achamber 25 separated from thecollection chamber 7. The latter is limited to the region included between thewall 2 a defining the bottom of thevolute 2, theend wall 13 andwalls 26 formed by the body of theapparatus 1, joining that part of thecompartment 6 situated adjacent to thevolute 2 to the peripheral wall defining thechamber 7. - The
discharge orifice 20 belonging to thecollection chamber 7 is in communication, via apipe 27, with theoxygen feed line 28. The mixture of air and oxygen flowing through the aforementioned gaps is thus recycled in the oxygen circuit. -
FIGS. 5 and 6 represent anapparatus 1 in which thecollection chamber 7 is divided into two adjoiningsubchambers wall 2 a of thevolute 2 and by anintermediate wall 30, and the other, 7 b, of which is defined by theintermediate wall 30 and by aperipheral wall 31 attaching to thecompartment 6. - As will be understood with reference to these
FIGS. 5 and 6 , thesubchamber 7 a is mainly intended for collecting the oxygen flow coming from thevolute 2, whereas thesubchamber 7 b is mainly intended for collecting the air flow coming from thecompartment 6. Eachsubchamber discharge orifice subchamber 7 a being connected, by apipe 27, to theoxygen feed line 28. Virtually pure oxygen is thus recycled in the oxygen circuit. - The invention therefore provides a
fan 1 which makes it possible under the best conditions to solve the problem of oxygen leakage in the direction of themotor 5, oxygen penetration not being acceptable on account of the risk of ignition which could result therefrom, and to simultaneously solve the problem of cooling the motor, this motor being subject to significant heating on account of its high speed of rotation. - It goes without saying that the invention is not limited to the embodiments described above by way of examples but that it extends to all the embodiments covered by the claims appended hereto.
Claims (16)
1. Fan (1) used in an apparatus for the regulated delivery of a gas, in particular oxygen, comprising a volute (2) whose inlet opening (3) is in communication with the oxygen feed line, an impeller (4) situated immediately downstream of the inlet opening (3) of the volute (2) and comprising an inlet opening connected to this inlet opening (3) of the volute (2) and outlet orifices (4 a) emerging into the volute (2), and an electric motor (5) for rotating the impeller (4), characterized in that it comprises:
a compartment (6) in which the motor (5) and, where appropriate, other electric elements or components belonging to the fan (1) are placed, this compartment (6) comprising an end wall (13) traversed by the shaft of the motor (5) and being supplied with pressurized air, and
a leak collection chamber (7) situated intermediately between the volute (2) and the said compartment (6), this chamber likewise being traversed by the shaft of the motor (5) and comprising a discharge orifice (20).
2. Fan (1) according to claim 1 , characterized in that the shaft of the motor (5) comprises at least one deflector member (17) for separating the respective air and oxygen flows and for orienting these flows in directions which are substantially perpendicular to the shaft of the motor (5).
3. Fan (1) according to claim 1 , characterized in that it comprises an impeller (15) arranged opposite the air inlet opening (10) belonging to the compartment (6).
4. Fan (1) according to claim 3 , characterized in that the impeller (15) belonging to the compartment (6) is arranged on the drive shaft for the impeller (4) situated in the volute (2), and is driven by the same motor (5) as the latter.
5. Fan (1) according to claim 1 , characterized in that the walls defining the compartment (6) comprise one or more openings (11) emerging directly into the said collection chamber (7).
6. Fan (1) according to claim 1 , characterized in that the compartment (6) comprises an internal transverse wall (12) which is distinct from the said end wall (13) and which is perforated by at least one hole (16) for the flow of air across this wall.
7. Fan (1) according to claim 6 , characterized in that the said internal transverse wall (12) is formed integrally with other walls defining the compartment (6) and serves to centre the motor (5) in this compartment (6).
8. Fan (1) according to claim 1 , characterized in that the said end wall (13) is composed of a thin plate.
9. Fan (1) according to claim 1 , characterized in that the wall (2 a) of the volute (2) that is traversed by the shaft of the motor (5) is composed of a thin plate.
10. Fan (1) according to claim 1 , characterized in that the collection chamber (7) is divided into two adjoining subchambers (7 a, 7 b), one of which, situated adjacent to the volute (2), is mainly intended to collect the flow of oxygen coming from this volute (2) and the other of which, situated adjacent to the said compartment (6), is mainly intended to collect the flow of air coming from this compartment (6), each subchamber (7 a, 7 b) comprising a discharge orifice (20 a, 20 b) which is specific to it.
11. Fan (1) according to claim 2 , characterized in that it comprises an impeller (15) arranged opposite the air inlet opening (10) belonging to the compartment (6).
12. Fan (1) according to claim 2 , characterized in that the walls defining the compartment (6) comprise one or more openings (11) emerging directly into the said collection chamber (7).
13. Fan (1) according to claim 2 , characterized in that the compartment (6) comprises an internal transverse wall (12) which is distinct from the said end wall (13) and which is perforated by at least one hole (16) for the flow of air across this wall.
14. Fan (1) according to claim 2 , characterized in that the said end wall (13) is composed of a thin plate.
15. Fan (1) according to claim 2 , characterized in that the wall (2 a) of the volute (2) that is traversed by the shaft of the motor (5) is composed of a thin plate.
16. Fan (1) according to claim 2 , characterized in that the collection chamber (7) is divided into two adjoining subchambers (7 a, 7 b), one of which, situated adjacent to the volute (2), is mainly intended to collect the flow of oxygen coming from this volute (2) and the other of which, situated adjacent to the said compartment (6), is mainly intended to collect the flow of air coming from this compartment (6), each subchamber (7 a, 7 b) comprising a discharge orifice (20 a, 20 b) which is specific to it.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/519,986 US20090291004A1 (en) | 2006-12-18 | 2007-12-13 | Fan for an apparatus for the regulated delivery of a gas, in particular oxygen |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US87550506P | 2006-12-18 | 2006-12-18 | |
FR06/10992 | 2006-12-18 | ||
FR0610992A FR2910078B1 (en) | 2006-12-18 | 2006-12-18 | FAN FOR APPARATUS FOR REGULATED DELIVERY OF A GAS, IN PARTICULAR OXYGEN. |
US89999707P | 2007-02-07 | 2007-02-07 | |
FR07/01001 | 2007-02-13 | ||
FR0701001A FR2910079B1 (en) | 2006-12-18 | 2007-02-13 | APPARATUS FOR DELIVERING GAS, ESPECIALLY RESPIRATORY ASSISTANCE, TO OXYGEN LEAK INTERLEDGE COLLECTION CHAMBER. |
PCT/IB2007/003874 WO2008075158A2 (en) | 2006-12-18 | 2007-12-13 | Fan for an apparatus for the regulated delivery of a gas, in particular oxygen |
US12/519,986 US20090291004A1 (en) | 2006-12-18 | 2007-12-13 | Fan for an apparatus for the regulated delivery of a gas, in particular oxygen |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090291004A1 true US20090291004A1 (en) | 2009-11-26 |
Family
ID=38656469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/519,986 Abandoned US20090291004A1 (en) | 2006-12-18 | 2007-12-13 | Fan for an apparatus for the regulated delivery of a gas, in particular oxygen |
Country Status (4)
Country | Link |
---|---|
US (1) | US20090291004A1 (en) |
EP (1) | EP2122180B1 (en) |
FR (1) | FR2910079B1 (en) |
WO (1) | WO2008075158A2 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130236303A1 (en) * | 2012-03-12 | 2013-09-12 | Nidec Corporation | Centrifugal fan |
WO2013139833A1 (en) * | 2012-03-22 | 2013-09-26 | Alfred Kärcher Gmbh & Co. Kg | Suction unit and suction machine |
US20140014109A1 (en) * | 2011-04-11 | 2014-01-16 | Airfan | Apparatus for regulated delivery of a gas, notably respiratory assistance apparatus |
US20160123349A1 (en) * | 2014-10-31 | 2016-05-05 | Team Worldwide Corporation | Electric Air Pump for Inflatable Body |
JP2017166330A (en) * | 2016-03-14 | 2017-09-21 | 株式会社Ihi | Centrifugal fluid machine, centrifugal blower, and centrifugal compressor |
US11261879B2 (en) | 2017-09-05 | 2022-03-01 | Ihi Corporation | Fluid machine |
EP3383470B1 (en) * | 2015-12-02 | 2022-04-06 | Fisher&Paykel Healthcare Limited | Flow path sensing for flow therapy apparatus |
CN114600345A (en) * | 2019-10-31 | 2022-06-07 | 艾尔芬公司 | Electric breathing assistance device and double cooling of a motor equipped with such a device |
US11446455B2 (en) | 2019-07-05 | 2022-09-20 | Air Liquide Medical Systems | Medical ventilator with internal casing including a motorized micro-blower and gas circuits |
US11668319B2 (en) | 2020-06-29 | 2023-06-06 | Speed to Market LTD. | Blower unit |
WO2023188813A1 (en) * | 2022-03-31 | 2023-10-05 | パナソニックIpマネジメント株式会社 | Blower and moving body |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090071478A1 (en) * | 2007-09-17 | 2009-03-19 | General Electric Company | Ventilator |
WO2012163384A1 (en) * | 2011-05-30 | 2012-12-06 | Valeo Klimasysteme Gmbh | Fan motor cooling |
FR3014320B1 (en) | 2013-12-10 | 2017-08-25 | Air Liquide Medical Systems | MOTORIZED TURBINE BREATHING ASSISTANCE APPARATUS |
FR3021371B1 (en) | 2014-05-21 | 2019-06-21 | Air Liquide Medical Systems | IMPROVED SEALANT MICRO-BLOWER FOR MEDICAL FAN AND METHOD FOR ASSEMBLING THE SAME |
IT201800010428A1 (en) * | 2018-11-19 | 2020-05-19 | Rimor Srl | FAN UNIT EQUIPPED WITH A SYSTEM FOR DISSIPATING THE HEAT COMING FROM THE IMPELLER. |
FR3098121A1 (en) * | 2019-07-05 | 2021-01-08 | Air Liquide Medical Systems | Medical ventilator with motorized micro-blower with improved cooling |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3790312A (en) * | 1971-07-23 | 1974-02-05 | H Bottoms | Pumps for liquids |
US3932070A (en) * | 1974-02-26 | 1976-01-13 | Ametek, Inc. | Electric motor fan unit for wet working air |
US4088424A (en) * | 1977-05-23 | 1978-05-09 | Ametek, Inc. | Wet pick-up vacuum unit motor bearing air seal |
US4120616A (en) * | 1975-10-06 | 1978-10-17 | Breuer Electric Manufacturing Company | Vacuum cleaner-blower assembly with sound absorbing arrangement |
US4527960A (en) * | 1984-02-03 | 1985-07-09 | General Signal Corporation | Bearing air seal for vacuum cleaner motor |
US5263825A (en) * | 1992-10-26 | 1993-11-23 | Ingersoll-Dresser Pump Company | Leak contained pump |
US5499902A (en) * | 1991-12-04 | 1996-03-19 | Environamics Corporation | Environmentally safe pump including seal |
US20090028730A1 (en) * | 2005-06-06 | 2009-01-29 | Bernhard Radermacher | Radial fan |
-
2007
- 2007-02-13 FR FR0701001A patent/FR2910079B1/en not_active Expired - Fee Related
- 2007-12-13 EP EP07859009.8A patent/EP2122180B1/en active Active
- 2007-12-13 WO PCT/IB2007/003874 patent/WO2008075158A2/en active Application Filing
- 2007-12-13 US US12/519,986 patent/US20090291004A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3790312A (en) * | 1971-07-23 | 1974-02-05 | H Bottoms | Pumps for liquids |
US3932070A (en) * | 1974-02-26 | 1976-01-13 | Ametek, Inc. | Electric motor fan unit for wet working air |
US4120616A (en) * | 1975-10-06 | 1978-10-17 | Breuer Electric Manufacturing Company | Vacuum cleaner-blower assembly with sound absorbing arrangement |
US4088424A (en) * | 1977-05-23 | 1978-05-09 | Ametek, Inc. | Wet pick-up vacuum unit motor bearing air seal |
US4527960A (en) * | 1984-02-03 | 1985-07-09 | General Signal Corporation | Bearing air seal for vacuum cleaner motor |
US5499902A (en) * | 1991-12-04 | 1996-03-19 | Environamics Corporation | Environmentally safe pump including seal |
US5263825A (en) * | 1992-10-26 | 1993-11-23 | Ingersoll-Dresser Pump Company | Leak contained pump |
US20090028730A1 (en) * | 2005-06-06 | 2009-01-29 | Bernhard Radermacher | Radial fan |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140014109A1 (en) * | 2011-04-11 | 2014-01-16 | Airfan | Apparatus for regulated delivery of a gas, notably respiratory assistance apparatus |
US9616188B2 (en) * | 2011-04-11 | 2017-04-11 | Airfan | Apparatus for regulated delivery of a gas, notably respiratory assistance apparatus |
US10662969B2 (en) | 2012-03-12 | 2020-05-26 | Nidec Corporation | Centrifugal fan |
US9574565B2 (en) * | 2012-03-12 | 2017-02-21 | Nidec Corporation | Centrifugal fan having main blade with axially upper end projecting upward |
US20130236303A1 (en) * | 2012-03-12 | 2013-09-12 | Nidec Corporation | Centrifugal fan |
WO2013139833A1 (en) * | 2012-03-22 | 2013-09-26 | Alfred Kärcher Gmbh & Co. Kg | Suction unit and suction machine |
US20160123349A1 (en) * | 2014-10-31 | 2016-05-05 | Team Worldwide Corporation | Electric Air Pump for Inflatable Body |
EP3383470B1 (en) * | 2015-12-02 | 2022-04-06 | Fisher&Paykel Healthcare Limited | Flow path sensing for flow therapy apparatus |
JP2017166330A (en) * | 2016-03-14 | 2017-09-21 | 株式会社Ihi | Centrifugal fluid machine, centrifugal blower, and centrifugal compressor |
US11261879B2 (en) | 2017-09-05 | 2022-03-01 | Ihi Corporation | Fluid machine |
US11446455B2 (en) | 2019-07-05 | 2022-09-20 | Air Liquide Medical Systems | Medical ventilator with internal casing including a motorized micro-blower and gas circuits |
CN114600345A (en) * | 2019-10-31 | 2022-06-07 | 艾尔芬公司 | Electric breathing assistance device and double cooling of a motor equipped with such a device |
US11668319B2 (en) | 2020-06-29 | 2023-06-06 | Speed to Market LTD. | Blower unit |
WO2023188813A1 (en) * | 2022-03-31 | 2023-10-05 | パナソニックIpマネジメント株式会社 | Blower and moving body |
Also Published As
Publication number | Publication date |
---|---|
WO2008075158A2 (en) | 2008-06-26 |
EP2122180A2 (en) | 2009-11-25 |
FR2910079B1 (en) | 2013-06-07 |
WO2008075158A3 (en) | 2008-08-14 |
FR2910079A1 (en) | 2008-06-20 |
EP2122180B1 (en) | 2017-06-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2122180B1 (en) | Fan for an apparatus for the regulated delivery of a gas, in particular oxygen | |
US4525995A (en) | Oil scavening system for gas turbine engine | |
US9616188B2 (en) | Apparatus for regulated delivery of a gas, notably respiratory assistance apparatus | |
EP1873357B1 (en) | Turbomachine comprising a flow delivery system for seals | |
EP2165078B1 (en) | Apparatus for regulated delivery of a gas, in particular breathing apparatus | |
US7766607B2 (en) | Device for ventilating turbine disks in a gas turbine engine | |
US7063734B2 (en) | Air/oil separation system and method | |
KR101270843B1 (en) | Device for sealing a bearing housing of an exhaust gas turbocharger | |
JP4998920B2 (en) | Turbomachine with a system for cooling the downstream side of an impeller of a centrifugal compressor | |
JP2005507044A (en) | Passive cooling system for auxiliary power plant equipment | |
CN104204535B (en) | With the multistage radial compressor unit pipetted in compressor stage to gas | |
EP1241327A1 (en) | Oil separator | |
CN101619677A (en) | Vortex air-oil separator system | |
US10808728B2 (en) | Centrifugal compressor and method of modifying centrifugal compressor | |
US20140096533A1 (en) | Bearing chamber venting system for an aircraft engine and method for providing a required pressure ratio at bearing chamber seals of an air-sealed bearing chamber | |
US4420293A (en) | Liquid cooled compressor with improved liquid separation | |
CN101589235B (en) | Fan for an apparatus for the regulated delivery of oxygen | |
CN110056430A (en) | Bearing is total to chamber lubrication and between centers densification device and birotor aero-engine | |
US20170314470A1 (en) | Turbofan engine and a method for exhausting breather air of an oil separator in a turbofan engine | |
EP1177046A1 (en) | A drive unit for a centrifuge rotor of a centrifugal separator | |
JP2007321763A (en) | Device for optimizing cooling in gas turbine and gas turbine having the device | |
US20190120086A1 (en) | Oil console equipment, rotary machine provided with oil console equipment, and method for recovering lubrication oil contained in exhaust gas | |
US20110083441A1 (en) | System and method for distributing fuel in a turbomachine | |
DE102017106779B4 (en) | centrifugal compressor | |
EP3023646B1 (en) | Aspirator pump with dual high pressure streams |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: AIRFAN, FRANCE Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GRASMUCK, GILBERT;REEL/FRAME:022877/0388 Effective date: 20090515 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |