EP0919462A2 - Verfahren zur Ermittlung des Luftverbrauchs für Taucher - Google Patents

Verfahren zur Ermittlung des Luftverbrauchs für Taucher Download PDF

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Publication number
EP0919462A2
EP0919462A2 EP98121295A EP98121295A EP0919462A2 EP 0919462 A2 EP0919462 A2 EP 0919462A2 EP 98121295 A EP98121295 A EP 98121295A EP 98121295 A EP98121295 A EP 98121295A EP 0919462 A2 EP0919462 A2 EP 0919462A2
Authority
EP
European Patent Office
Prior art keywords
air
display
time
bottle
consumption
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.)
Granted
Application number
EP98121295A
Other languages
English (en)
French (fr)
Other versions
EP0919462B1 (de
EP0919462A3 (de
Inventor
Giovanni Garofalo
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.)
HTM Sport SpA
Original Assignee
HTM Sport SpA
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 HTM Sport SpA filed Critical HTM Sport SpA
Publication of EP0919462A2 publication Critical patent/EP0919462A2/de
Publication of EP0919462A3 publication Critical patent/EP0919462A3/de
Application granted granted Critical
Publication of EP0919462B1 publication Critical patent/EP0919462B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
    • B63C11/02—Divers' equipment
    • B63C11/32—Decompression arrangements; Exercise equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
    • B63C11/02—Divers' equipment
    • B63C2011/021—Diving computers, i.e. portable computers specially adapted for divers, e.g. wrist worn, watertight electronic devices for detecting or calculating scuba diving parameters

Definitions

  • the present invention relates to a method for the evaluation of air consumption of a scuba diver when diving by means of an integrated computer in which such method of evaluation is implemented.
  • the way in which the computer gauges the remaining air time is linked to the pressure variation in the bottles in relation to the diving depth of the scuba diver.
  • the bottles will have a certain internal air pressure p h . Supposing the diver remains at said depth h, there will be a progressive pressure decrease ⁇ p in bar/minute in the bottles over a certain time t of decrease.
  • the time value appearing on the computer display won't be the calculated value t r , but it will be reduced of a certain safety value, some minutes for instance.
  • the remaining air time is calculated by keeping as constants the variation of air pressure in the bottles, a function of the diving depth, and the diver's breathing rhythm; if, for example, the scuba diver went down to a greater depth, the remaining air time would decrease, while it would increase if he went up. This known system of calculation used by inte
  • grated computers does not have any relation with the bottle capacity, since the smaller the bottle the faster the air pressure in the bottle decreases. Therefore, such system only allows an approximate evaluation of the remaining air time, without permitting any evaluation of air consumption for the scuba diver.
  • evaluation of air consumption is very important since it allows the scuba diver not only to check whether he/she is breathing quietly or panting, but also, said consumption being known, to plan his/her future divings.
  • the present invention aims therefore at providing out a method to let the scuba diver have detailed information about such parameters as average air consumption and remaining air time during a diving, by means of an integrated computer of a known type, which evaluates such parameters using the method of the present invention and shows them on a suitable display connected to the integrated computer.
  • the average air consumption of a scuba diver can be given, to the diver's convenience, in litres/minute "on surface", that is to say, at atmospheric pressure. Indicating as Q s the air consumption "on surface” in l/min, and knowing that, from the surface downwards, pressure increases of about 1 bar every 10 m of diving depth, we can desume the effective air consumption Q r as a function of depth. Now the computer can calculate the consumption Q s in l/min by dividing the effective consumption Q r by the pressure p h related to the diving depth of the scuba diver.
  • the computer In order to calculate such air consumption value Q s , the computer will obviously have to know the quantity of air the diver has at his/her disposal; therefore, designating as V b the bottle volume in litres and as p b the air pressure in bar within the bottles, the quantity V a of air in the bottle, considering the volume occupied by air at atmospheric pressure under the same conditions, will correspond to V b ⁇ p b .
  • the scuba diver therefore, will have to set the bottle capacity in litres on the dial 2 of the display 1 connected to the computer, and, according to the variations of pressure in the bottle due to the diving depth and to the breathing rhythm, he/she will be able to read the average air consumption in l/min "on surface" on the dial 3 of the display 1. Having thus calculated the average air consumption, the computer will now calculate, according to the method of the present invention, the quantity of available air and then, on the basis of such average consumption in l/min, it will show the air time in minutes on the dial 4.
  • the scuba diver will also have to set, besides said capacity in cu/ft onto the dial 2, the maximum nominal air pressure in the bottles onto the dial 5 of the display 1.
  • the computer will process those data and will show, as in the previous embodiment, the average air consumption in l/min and the remaining air time for the diver while diving.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Measuring Fluid Pressure (AREA)
  • Electric Clocks (AREA)
EP19980121295 1997-11-28 1998-11-09 Verfahren zur Ermittlung des Luftverbrauchs für Taucher Expired - Lifetime EP0919462B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITGE970099 1997-11-28
ITGE970099 IT1297708B1 (it) 1997-11-28 1997-11-28 Metodo per la valutazione del consumo di aria per sub in immersione.

Publications (3)

Publication Number Publication Date
EP0919462A2 true EP0919462A2 (de) 1999-06-02
EP0919462A3 EP0919462A3 (de) 2001-03-21
EP0919462B1 EP0919462B1 (de) 2004-01-21

Family

ID=11355085

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980121295 Expired - Lifetime EP0919462B1 (de) 1997-11-28 1998-11-09 Verfahren zur Ermittlung des Luftverbrauchs für Taucher

Country Status (3)

Country Link
EP (1) EP0919462B1 (de)
DE (1) DE69821201T2 (de)
IT (1) IT1297708B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1145740A1 (de) * 2000-04-10 2001-10-17 John E. Lewis Verfahren und Vorrichtung zur Luftzeitrestbetragsberechnung für selbumfassendes Atmungsgerät
GB2602508A (en) * 2021-01-05 2022-07-06 Avon Polymer Prod Ltd Breathing apparatus

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4033292A1 (de) * 1990-10-19 1992-04-23 Uwatec Ag Ueberwachungsvorrichtung fuer mobile atemgeraete
US5512941A (en) * 1991-03-04 1996-04-30 Canon Kabushiki Kaisha Image sensing apparatus
US5457284A (en) * 1993-05-24 1995-10-10 Dacor Corporation Interactive dive computer
US5617848A (en) * 1993-11-17 1997-04-08 Cochran; Michael J. Advanced dive computer that calculates and displays the user's breathing parameter and water salinity
DE4419734C2 (de) * 1994-06-06 1998-04-30 Foerderverein Inst Fuer Medizi Verfahren zur Ermittlung der Resteinsatzzeit von Atemschutzgeräten und Atemgascontroller zur Durchführung des Verfahrens

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1145740A1 (de) * 2000-04-10 2001-10-17 John E. Lewis Verfahren und Vorrichtung zur Luftzeitrestbetragsberechnung für selbumfassendes Atmungsgerät
US6543444B1 (en) 2000-04-10 2003-04-08 John E. Lewis System and method for air time remaining calculations in a self-contained breathing apparatus
GB2602508A (en) * 2021-01-05 2022-07-06 Avon Polymer Prod Ltd Breathing apparatus
GB2602508B (en) * 2021-01-05 2024-03-20 Avon Polymer Prod Ltd Breathing apparatus

Also Published As

Publication number Publication date
ITGE970099A1 (it) 1999-05-28
IT1297708B1 (it) 1999-12-20
EP0919462B1 (de) 2004-01-21
EP0919462A3 (de) 2001-03-21
DE69821201D1 (de) 2004-02-26
DE69821201T2 (de) 2004-11-04

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