WO1997021466A1 - Appareil respiratoire et embout associe - Google Patents

Appareil respiratoire et embout associe Download PDF

Info

Publication number
WO1997021466A1
WO1997021466A1 PCT/GB1996/003023 GB9603023W WO9721466A1 WO 1997021466 A1 WO1997021466 A1 WO 1997021466A1 GB 9603023 W GB9603023 W GB 9603023W WO 9721466 A1 WO9721466 A1 WO 9721466A1
Authority
WO
WIPO (PCT)
Prior art keywords
air
flow
nozzle
outlet
inlet
Prior art date
Application number
PCT/GB1996/003023
Other languages
English (en)
Inventor
Peter David Grayson
Original Assignee
Geo Limited
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 Geo Limited filed Critical Geo Limited
Priority to GB9812206A priority Critical patent/GB2323294B/en
Priority to AU13839/97A priority patent/AU1383997A/en
Publication of WO1997021466A1 publication Critical patent/WO1997021466A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
    • A62B18/003—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort having means for creating a fresh air curtain

Definitions

  • the present invention relates to a breathing apparatus and also to a nozzle for use in a breathing apparatus.
  • hay fever and asthma can relieve the symptoms of their complaint to a substantial extent by reducing the amount of particles in the air they breathe without completely eliminating such particles.
  • the air supplied in this way firstly provides clean breathable air and secondly provides a positive gas pressure in front of the face that prevents particles in the air from reaching the face.
  • the transparent visor is dispensed with and a fast-flowing curtain of air is established in front of the wearer's face to provide
  • the present invention provides a breathing apparatus that can
  • a breathing apparatus comprising a nozzle, means for
  • a nozzle for use in a breathing apparatus, the nozzle
  • the nozzle comprises at least one inlet for air, at
  • the outlets are arranged such that, in operation, the second flow is
  • the first flow is directed onto the nose/mouth region of the face to provide breathing air while the second flow establishes a gas curtain outwardly of the first flow and prevents, or at least reduces, the number of atmospheric particles
  • the second flow of air may be generally conical, in which case the second outlet is usually annular in shape, or it may be made up of two or more generally planar flows each issuing from a slot-shaped orifice. If more than one inlet is provided for air, the air supplied to each inlet may be from a single source or from more than one source,
  • This filtering may occur either at
  • the nose/mouth region of the face of the wearer in use.
  • the nose/mouth region of the face of the wearer in use.
  • each first outlet may be in communication with a first inlet and the
  • each second outlet may be in communication with a second inlet.
  • the first inlet is supplied with
  • the first flow is preferably slower than the second flow. This is
  • a flow-resistance e.g. a gauze, screen
  • first flow may be altered by a suitable choice of outlet diameters, by providing a curved or sinuous flow path for air from the inlet to the or
  • the or each second outlet need not flow freely but may be slowed
  • the second flow is preferably not directed at the face but flows
  • the arrangement being such that air flowing through the duct induces
  • Figure 1 shows a schematic representation of the operation of
  • Figures 2 to 1 1 show sectional elevations of the ten nozzles.
  • Figures 1 2 and 14 are schematic diagrams of an apparatus for testing the efficiency of nozzles
  • FIGS 13 and 15 are graphs showing the efficiency of various
  • a nozzle is indicated with the reference numeral 10.
  • the nozzle is supplied with clean air along a duct (not shown) from a supply unit (again not shown) which is
  • a portable battery-powered device that draws in atmospheric air and filters or precipitates the suspended particles e.g. by electrostatic precipitation and/or by a carbon filter, to produce air with almost no suspended particles greater than between 10 microns
  • Such devices are known rjer se.
  • the nozzle is held in place in front of the nose/mouth region by the duct which in turn is attached to the wearer by a clip that is hooked over one or both ears or by a resilient head band.
  • the nozzle 10 produces a first flow of air (shown by arrows 1 1 ) that is breathed. It also produces a second flow (shown by arrows 12) in the form of a curtain of fast-flowing air that prevents contaminated atmospheric air from reaching the wearer as shown schematically by arrows 13. It will be noticed that the second stream does not impinge on the wearer's face and hence does not cause discomfort.
  • a mixture of exhaled air, unbreathed air from the first stream and some air from the second stream forms a region of gas 14
  • the high pressure region 14 is bordered by the second air stream 12 from the nozzle 10, which prevents air in the region from crossing it, thereby increasing the pressure in the region 14.
  • passage 21 for filtered air shown schematically by arrows 22.
  • flow-resistive mesh 23a e.g. made of cotton gauze, plastics metal
  • annular second outlet 25 Due to the gauze placed in the first outlet
  • first outlet is less than that leaving the second outlet and the latter
  • fast-moving air is augmented by atmospheric air drawn into the
  • curtain of fast-moving air is a mixture of filtered air from inlet passage
  • the first outlet 23 is sufficiently low that it is not uncomfortable to the first outlet 23
  • the flow resistive mesh 23a covering the first outlet 23 may be of different porosity from that of the mesh wall 26 or may be absent.
  • the nozzle may be of any suitable geometry but, by way of example only the geometry of the nozzle
  • the diameter of the passageway 21 is preferably between 5 and 20 mm.
  • the length of walls 35 extending from the walls of passageway 21 is preferably between 2 and 50 mm.
  • the first outlet 23 is preferably up
  • the width of the duct 24 leading to the second outlet 25 is preferably between 0.2 and 5mm.
  • the walls of the duct are not necessarily parallel such that the width of the duct 24 may vary along its length.
  • a nozzle of such dimensions is generally between 10 litres/min to 250 litres/min.
  • the curved shape of the inlet passage generates turbulence in the air flowing through the passage 31 as indicated by arrows 22a in Figure 5.
  • the turbulence generated optimises the even distribution of air-flow to the first and second outlets and thus assists in
  • Figure 6 shows a nozzle as shown in Figures 4 and 5 but
  • the walls 26 may be impermeable or porous as in the previous
  • passageway 29 may be displaced to one side in certain embodiments.
  • passageway 29 could comprise a tube supported within
  • the first outlet 23 could be
  • Figure 8 shows a still further embodiment of nozzle according
  • air flow deflectors 32 located within the passageway 31 .
  • the deflectors such as ribs upstanding from the
  • the nozzle has extensions 34 which provide a physical barrier in addition to the gas curtain (provided by the second air flow from the second outlets) thus increasing the avoidance of contaminated atmospheric air from reaching the wearer.
  • the extensions may be integral with the nozzle or may be provided as a removable attachment for the nozzle. This embodiment is particularly useful for cyclists where increased wind disturbance velocities during cycling could disrupt the protective barrier provided by a gas curtain alone. Again, as in the previous embodiments, the walls 26 could be impermeable or porous.
  • the nozzle shown in Figure 10 has a side inlet passage 41 leading to a hemispherical chamber 42 having a first outlet 43 and a second outlet 44 at opposed ends of the chamber. Across the first outlet 43 is a flow-resistive mesh held in place by a multi-armed spider 45 which also serves to support a post 46 within the chamber
  • the post 46 extends through the second outlet 44 and has a head portion 47 which guides air leaving the second outlet along the outer face of the chamber 42. The flow of air hugs the outer face of
  • the nozzle shown in Figure 1 1 has an air inlet passage 51
  • a tube 52 Arranged within the tube 52 is a second tube
  • outlets 57 are provided in the first tube 52, one slot being arranged
  • the second outlets each providing
  • the air may also be humidified and/or heated to reduce the
  • Figure 1 2 is a schematic diagram of an apparatus for testing
  • a dummy head 61 is
  • Air is drawn through passageways in the dummy head by
  • a flow meter 67 and a valve 68 are located in the passageway between the dummy head 61 and the pump 64. The flow meter measures the velocity of air drawn in through the valve 68 and the valve enables an environmental sample to be drawn through a tube 69 located in front of the dummy head and analyzed by the flame photometer 66.
  • a nozzle 70 according to Figures 2 to 1 1 is placed
  • An atomised stream of sodium chloride is fed into the chamber 62 from a source 72 and a supply of smoke is fed into the chamber 62 through a diffuser 72 so that the air flow around the dummy head
  • Figure 14 is a schematic diagram of an apparatus for testing
  • Air containing atomised sodium chloride is fed into the enclosure
  • the effective working volume of the enclosure is most preferably 8
  • the individual may be walking, running, talking (as appropriate) and/or
  • the fan 90 may be switched on to blow a current of air towards the
  • Samples of air are drawn from the breathing zone of the individual and the enclosure by action of the pumps 79.
  • the samples are drawn from the breathing zone of the individual and the enclosure by action of the pumps 79.
  • the protection efficiency of the nozzles can be analysed for different circumstances for example standing, walking, talking etc.
  • Figure 15 is a graph illustrating the protection efficiency of a nozzle as shown in Figure 3 (y- axis) tested in accordance with the procedure represented by Figure 14 with the individual in a standing,

Landscapes

  • Health & Medical Sciences (AREA)
  • Pulmonology (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

Appareil respiratoire et embout destiné à être utilisé dans un appareil respiratoire. Lorsque l'appareil est utilisé, de l'air filtré s'écoule dans le passage (31) de l'embout et un premier écoulement d'air destiné à la respiration sort par une première sortie (23). Une deuxième sortie (25) permet l'échappement d'un deuxième écoulement d'air qui produit un voile gazeux à l'extérieur du premier écoulement d'air. Ce voile gazeux réduit sensiblement la respiration d'air atmosphérique contaminé par l'utilisateur équipé de l'appareil respiratoire. Cet appareil et son embout sont tout particulièrement destinés aux cyclistes, aux personnes souffrant d'asthme, etc.
PCT/GB1996/003023 1995-12-08 1996-12-09 Appareil respiratoire et embout associe WO1997021466A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB9812206A GB2323294B (en) 1995-12-08 1996-12-09 Breathing apparatus and nozzle therefor
AU13839/97A AU1383997A (en) 1995-12-08 1996-12-09 Breathing apparatus and nozzle therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9525097.3 1995-12-08
GBGB9525097.3A GB9525097D0 (en) 1995-12-08 1995-12-08 Breathing apparatus and nozzle therefor

Publications (1)

Publication Number Publication Date
WO1997021466A1 true WO1997021466A1 (fr) 1997-06-19

Family

ID=10785104

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/003023 WO1997021466A1 (fr) 1995-12-08 1996-12-09 Appareil respiratoire et embout associe

Country Status (3)

Country Link
AU (1) AU1383997A (fr)
GB (1) GB9525097D0 (fr)
WO (1) WO1997021466A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2327192A (en) * 1997-07-14 1999-01-20 Christopher Raymond Close Mobile clean air supply unit
WO2002020078A1 (fr) * 2000-09-11 2002-03-14 Southmedic Incorporated Diffuseur d'oxygene pour systeme de distribution d'oxygene a un patient
EP1342484A1 (fr) * 2002-03-06 2003-09-10 The BOC Group plc Canules nasales améliorées
WO2014097083A1 (fr) * 2012-12-18 2014-06-26 Koninklijke Philips N.V. Dispositif de diffusion pour appareil à tampons nasaux
DE202014105266U1 (de) * 2014-03-07 2014-11-13 Siegfried Richter Schutzmaske
DE102014003866A1 (de) * 2014-03-18 2015-09-24 Jrp Vision Ltd. Zuführvorrichtung zur Zufuhr von Atemluft
CN106039517A (zh) * 2016-07-08 2016-10-26 惠州大亚湾太极鲜氧实业有限公司 一种气幕式面罩
WO2017103246A1 (fr) * 2015-12-18 2017-06-22 Alfred Kärcher Gmbh & Co. Kg Système de purification d'air individuel portable
WO2023134907A1 (fr) * 2022-01-17 2023-07-20 Mincor Ab Agencement de zone respiratoire

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE545607A (fr) *
BE483907A (fr) *
DE2135928A1 (de) * 1970-07-20 1972-01-27 Mine Safety Appliances Co., Pittsburgh, Pa. (V.StA.) Atemschutzgerät
DE2903921A1 (de) * 1979-02-02 1980-08-14 Draegerwerk Ag Atemschutzhaube
WO1989000874A1 (fr) * 1987-07-28 1989-02-09 Soederberg Stig Masque respiratoire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE545607A (fr) *
BE483907A (fr) *
DE2135928A1 (de) * 1970-07-20 1972-01-27 Mine Safety Appliances Co., Pittsburgh, Pa. (V.StA.) Atemschutzgerät
DE2903921A1 (de) * 1979-02-02 1980-08-14 Draegerwerk Ag Atemschutzhaube
WO1989000874A1 (fr) * 1987-07-28 1989-02-09 Soederberg Stig Masque respiratoire

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2327192A (en) * 1997-07-14 1999-01-20 Christopher Raymond Close Mobile clean air supply unit
GB2327192B (en) * 1997-07-14 2001-08-29 Christopher Raymond Close Mobile clean air supply unit
WO2002020078A1 (fr) * 2000-09-11 2002-03-14 Southmedic Incorporated Diffuseur d'oxygene pour systeme de distribution d'oxygene a un patient
EP1342484A1 (fr) * 2002-03-06 2003-09-10 The BOC Group plc Canules nasales améliorées
US6776163B2 (en) 2002-03-06 2004-08-17 The Boc Group, Plc Nasal cannulae
WO2014097083A1 (fr) * 2012-12-18 2014-06-26 Koninklijke Philips N.V. Dispositif de diffusion pour appareil à tampons nasaux
DE202014105266U1 (de) * 2014-03-07 2014-11-13 Siegfried Richter Schutzmaske
DE102014003866A1 (de) * 2014-03-18 2015-09-24 Jrp Vision Ltd. Zuführvorrichtung zur Zufuhr von Atemluft
WO2017103246A1 (fr) * 2015-12-18 2017-06-22 Alfred Kärcher Gmbh & Co. Kg Système de purification d'air individuel portable
CN106039517A (zh) * 2016-07-08 2016-10-26 惠州大亚湾太极鲜氧实业有限公司 一种气幕式面罩
WO2023134907A1 (fr) * 2022-01-17 2023-07-20 Mincor Ab Agencement de zone respiratoire

Also Published As

Publication number Publication date
GB9525097D0 (en) 1996-02-07
AU1383997A (en) 1997-07-03

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