GB1106431A - Automatic fluid supply control apparatus - Google Patents

Automatic fluid supply control apparatus

Info

Publication number
GB1106431A
GB1106431A GB9944/65A GB994465A GB1106431A GB 1106431 A GB1106431 A GB 1106431A GB 9944/65 A GB9944/65 A GB 9944/65A GB 994465 A GB994465 A GB 994465A GB 1106431 A GB1106431 A GB 1106431A
Authority
GB
United Kingdom
Prior art keywords
pressure
valve
mask
oxygen
flow
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.)
Expired
Application number
GB9944/65A
Inventor
Christopher Adrian Haire
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.)
Westland Group PLC
Original Assignee
Westland Aircraft Ltd
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 Westland Aircraft Ltd filed Critical Westland Aircraft Ltd
Priority to GB9944/65A priority Critical patent/GB1106431A/en
Priority to DE19661573124 priority patent/DE1573124C/en
Priority to ES0323949A priority patent/ES323949A1/en
Publication of GB1106431A publication Critical patent/GB1106431A/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B7/00—Respiratory apparatus
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B9/00—Component parts for respiratory or breathing apparatus
    • A62B9/02—Valves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/08—Means for indicating or recording, e.g. for remote indication
    • G01L19/12—Alarms or signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
    • G01L9/0072—Transmitting or indicating the displacement of flexible diaphragms using variations in capacitance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
    • G01L9/0089—Transmitting or indicating the displacement of pistons by electrical, electromechanical, magnetic or electromagnetic means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
    • G05D16/2013—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using throttling means as controlling means

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Pulmonology (AREA)
  • Fluid Mechanics (AREA)
  • Emergency Management (AREA)
  • Business, Economics & Management (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electromagnetism (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Flow Control (AREA)
  • Control Of Fluid Pressure (AREA)

Abstract

1,106,431. Respiratory appliances. WESTLAND AIRCRAFT Ltd. 1 March, 1966 [9 March, 1965], No. 9944/65. Heading AST. [Also in Division G3] In a system for maintaining the pressure in an oxygen mask independent of variations due to inhalation, a differential pressure transducer compares mask pressure with a reference pressure and produces an electrical error signal which controls, electronically, an inlet valve coupling the mask to an oxygen supply. In Fig. 2, oxygen is supplied from a high pressure source through a control valve 10 and an airmix valve 21 to a mask 1 for fitting over nose and mouth represented by passage 7. A capacitance differential pressure device 6 compares the pressure within the mask with that in a reference cavity 14 and any increase of capacity due to fall of pressure with inhalation is effective through an electronic controller 12 to open a spring biassed solenoid valve 10 sufficiently to restore the pressure. Increases of pressure during exhalation are relieved by a non-return valve 13 biassed by the reference pressure. Reference cavity 14 is supplied from high pressure source through a bleed valve 15 and the pressure within it is varied with altitude by an exhaust valve 16 controlled by a bellows 17 acting in opposition to ambient pressure. Capacitance increases in device 6 vary the frequency of a multivibrator associated with a frequency discriminator, a rate circuit and DC feedback amplifiers in controller 12, so that if the pressure drops are sufficiently sudden, e.g. due to breathing, solenoid valve 10, which is fluid cooled, opens proportionally to restore the pressure. This arrangement ensures that if the mask is taken off, solenoid valve 10 remains closed after the initial pressure change since there will be no further sudden change. A flow meter comprising a bleed valve may be included in the tube 11 connected to the high pressure source. The pressure drop across the bleed valve actuates a spring restrained piston associated with a magnetically operated reed switch to give an indication that oxygen is flowing. Above a predetermined rate of flow, the piston opens a by-pass to prevent the flow from being impeded. Constructional details of a suitable control valve having adjustable characteristics, a flow measuring device, and a capacitance measuring device are given.
GB9944/65A 1965-03-09 1965-03-09 Automatic fluid supply control apparatus Expired GB1106431A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9944/65A GB1106431A (en) 1965-03-09 1965-03-09 Automatic fluid supply control apparatus
DE19661573124 DE1573124C (en) 1965-03-09 1966-02-26 Breathing gas supply device for high-altitude breathing apparatus
ES0323949A ES323949A1 (en) 1965-03-09 1966-03-09 Automatic fluid supply control apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9944/65A GB1106431A (en) 1965-03-09 1965-03-09 Automatic fluid supply control apparatus

Publications (1)

Publication Number Publication Date
GB1106431A true GB1106431A (en) 1968-03-20

Family

ID=9881659

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9944/65A Expired GB1106431A (en) 1965-03-09 1965-03-09 Automatic fluid supply control apparatus

Country Status (2)

Country Link
ES (1) ES323949A1 (en)
GB (1) GB1106431A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2439839A (en) * 2006-07-04 2008-01-09 Draeger Aerospace Gmbh Cockpit oxygen mask with magnetic valve

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2439839A (en) * 2006-07-04 2008-01-09 Draeger Aerospace Gmbh Cockpit oxygen mask with magnetic valve
GB2439839B (en) * 2006-07-04 2011-04-13 Ger Aerospace Gmbh Dr Cockpit oxygen mask
US8302604B2 (en) 2006-07-04 2012-11-06 B/E Aerospace Systems Gmbh Cockpit oxygen mask

Also Published As

Publication number Publication date
DE1573124A1 (en) 1971-10-28
ES323949A1 (en) 1966-11-16

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