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WO1994026353A1 - Dispositif de dosage pour la production d'une mousse - Google Patents

Dispositif de dosage pour la production d'une mousse Download PDF

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Publication number
WO1994026353A1
WO1994026353A1 PCT/NZ1994/000041 NZ9400041W WO9426353A1 WO 1994026353 A1 WO1994026353 A1 WO 1994026353A1 NZ 9400041 W NZ9400041 W NZ 9400041W WO 9426353 A1 WO9426353 A1 WO 9426353A1
Authority
WO
WIPO (PCT)
Prior art keywords
foam
proportioner
concentrate
pressure
regulator
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.)
Ceased
Application number
PCT/NZ1994/000041
Other languages
English (en)
Inventor
Gary Trevor Love
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AU65843/94A priority Critical patent/AU6584394A/en
Publication of WO1994026353A1 publication Critical patent/WO1994026353A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C5/00—Making of fire-extinguishing materials immediately before use
    • A62C5/02—Making of fire-extinguishing materials immediately before use of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/29—Mixing systems, i.e. flow charts or diagrams
    • B01F23/291—Mixing systems, i.e. flow charts or diagrams for obtaining foams or aerosols

Definitions

  • This invention relates to a foam proportioner and more particularly to a mechanism for mixing foam and water to be used as a fire suppressant.
  • Foam is 3 to 5 times more effective as a fire suppressant than water alone. This is because foam both smothers and cools the fire, hence removing both the oxygen and heat required to create and sustain fire. Conversely, water only cools the fire. Foam is also safer to use in fires where electricity and/or oil is involved. At present fire fighting foam is produced in a number of ways and one of these is a batch mixing process. Concentrate wastage from batch mixing is a problem with existing processes as is tank and pump corrosion.
  • An object of the invention is to overcome the above- identified disadvantages and to offer users a useful alternative choice.
  • a proportioner mechanism including a water flow sensor, a concentrate metering valve, a concentrate pressure regulator, a concentrate booster pump, the arrangement being such that the rate of flow of concentrate, which is at atmospheric pressure, from a supply tank is powered by pressure from a liquid supply which is automatically pressure adjusted by a pressure regulator to adjust the flow rate of concentrate to be mixed.
  • the proportioner mechanism can be used to mix a foam concentrate with water for use in a fire fighting situation.
  • a foam proportioner in which the flow rate through a metering valve is continuously monitored to control the injection rate of a foam concentrate, the proportioner incorporating a foam concentrate pressure regulator the operation of which is solely controlled by water pressure which is varied in accordance with variations in pressure in a foam pressure sense line and a water reference pressure line.
  • a foam proportioner suitable for a fire tender including a pump, venturi, dual differential regulator controller, metering valve, regulator, the arrangement being such that water from a tank is drawn by the pump and directed to the venturi from which mixed foam and water is delivered, the foam being proportioned after being drawn from a foam tank through the regulator to the metering valve from which the concentrate passes to a venturi which surrounds the pump, the volume of foam being controlled by the dual differential regulator controller, controlled from the venturi to the regulator.
  • Figure 1 shows a block diagram of the parts of a foam proportioner according to the invention
  • Figure 2 shows a schematic circuit diagram of a control system for controlling the foam proportioner shown in Figure 1;
  • Figure 3 shows a section through a booster pump for the foam proportioner shown in Figures 1 and 2;
  • Figure 4 shows a block diagram of the parts of an alternative construction of foam proportioner according to the invention.
  • the proportioner has a delivery flow sensor 1, a foam concentrate booster pump 2, a foam concentrate pressure regulator 3 and a foam concentrate metering valve 4.
  • the foam concentrate from tank 5 (not shown in Figure 1) flows in the direction of the arrow to the booster pump 2.
  • the output from the booster pump 2 passes through the pressure regulator 3.
  • the pressure at the regulator 3 is sensed by the delivery flow sensor 1.
  • the output from the regulator 3 passes to the foam concentrate metering valve 4 from which the foam concentrate passes to a venturi mixer 6 associated with a water flow.
  • the control mechanism includes a sense change over valve 7, a pair of power changeover valves 8, 8', a water ram 9, a foam concentrate ram 10 and a pressure compensation piston 11.
  • the valve 8' is slave off valve 8. The mechanism is configured as shown.
  • the delivery flow sensor 4 has a diaphragm 12 one side of which is connected to the water reference pressure line at 14. The other side of the diaphragm 12 is connected to a foam pressure sensor line 15. Movement of the diaphragm 12 via piston 16 controls the flow of foam at 17 to the venturi at A.
  • An advantage of the invention is that the proportioner maintains the ratio of concentrated (foam) liquid at a preset value no matter what pressure or flow rate exists in the liquid to which the concentrate is being mixed.
  • FIG 3 a section through a booster pump which can be used in the proportioner shown in Figures 1 and 2.
  • the booster pump is an integrally formed unit and is indicated generally by the arrow 2.
  • the booster pump 2 is powered by water pressure and can replace the water ram 9 and foam ram 10 shown in Figure 2.
  • the booster pump 2 has a casing 18 and body 19 formed or fabricated to support therein a reciprocating piston 20.
  • the piston 20 when operating boosts the pressure in a foam passing from a suction end or inlet 21 to outlet 22.
  • the piston 20 has a bore 23 therethrough which is sealed by 0-ring seals 24 which contact the surface of spigot 25 which is formed as part of the body 19.
  • the bore 23 has at one end a non-return or check valve 26 which is mounted with associated springs etc. in the chamber 28.
  • the movement of the piston 20 is governed by stops 29 and 34.
  • the piston 20 is dimensioned at its outer surface 31 to move in a bore 32 in the body 19.
  • the surface 31 has 0- ring seals 33 which seal against the inner surface of the bore 32.
  • the volume 30 of the bore 32 is selected so that the piston 20's movement results in a double action pumping effect.
  • the suction or inlet end 21 of the body 19 has a non ⁇ return valve 27.
  • the body 19 has valve surfaces 35, 36 on which power valve sleeve 37 and sensing valve sleeve 38 slide respectively.
  • the inner surface of the sensing valve sleeve 38 contacts a surface 40 on the periphery of the piston 19.
  • the outer surface 41 of the sleeve 38 has rebates 42, 43, 44, 45 and 46 in its surface.
  • the outer surface 41 at end 47 contacts the inner surface 48 of the casing 18.
  • the surface 41 has the rebates 44, 45 and 46.
  • the inner surface 49 of the power valve sleeve 37 contacts the outer surface 50.
  • An outer surface 51 contacts a rebated section 52 on the inner surface of the casing 18 in which section 52 the sleeve 37 reciprocates in the directions shown.
  • the outer surface of the sleeve 37 has circumferential grooves 53 between which are abstracts with 0-ring seals 54.
  • the casing 18 has in its surface a series of ports.
  • the port 55 is connected to the power valve drive.
  • the ports 56 are exhaust ports.
  • the ports 57 and 58 are connected and act as pilot port A and B respectively.
  • the port 59 is connected to act as a piston position sense valve drive.
  • the ports 60 are exhaust ports.
  • the ports 61 and 62 are connected to ports 57 and 58 respectively.
  • the sensing valve sleeve 39 has passages 63, 64 which are positioned to communicate with chamber 65, 66 formed between the body 19, pump piston 20 and sleeve 38.
  • the power valve sleeve has passages or galleries 67, 68 and 69.
  • the booster pump 2 increases the pressure in the foam flow when the pump piston 20 is reciprocating in the direction of arrows 70.
  • the non ⁇ return valves 26 and 27 operating successively to ensure there is no back flow in a direction opposite the foam flow 71.
  • Operation of the piston 20 is regulated through the movement of the power valve sleeve 37 which is moved by the piston 20 when it successively contacts the abutments 29 and 34. Movement of the power valve sleeve 38 is controller by the sensing valve sleeve 38.
  • the 5-ports or passages of the sense valve sleeve 38 slave the water pressure to move the power valve sleeve 37.
  • pressure is applied to chambers 65 and 66 from the power valve drive inlet 55 to thereby move the piston 20.
  • the position of the power valve sleeve 37 is controlled by inputs from the pilot control ports (A) 61 and (B) 62 via ports 57 and 58 respectively to vary the flow from the power valve drive port 55 to reciprocate the piston 20.
  • Typical specifications of an example of the invention are: Maximum foam concentrate pumping rate 12 litres/min
  • the flow of foam concentrate is controlled through the mechanism shown in Figure 2 where high pressure water is used as the means to control the concentrate flow.
  • FIG. 4 shows a block diagram of the parts of an alternative construction of foam proportioner.
  • a fully propor t ioned and accurate supply of foam is supplied over a full range of water flows. This has not been possible with existing equipment.
  • This added control is given by a dual differential regulator controller 72.
  • a pump 73 in this example draws water from a water tank at 74 and it flows in the direction indicated to a venturi 75 from which a delivery of between 0 - 6000 litres/min is obtainable.
  • Foam from a tank at 76 is supplied via a regulator 77, through a metering valve 78 to a round the pump venturi 79.
  • the volume of foam inducted into the venturi 79 is between 0 - 480 litres/min and this is directed at connection 80 prior to the pump 73.
  • the regulator 77 is controlled by an output from the dual differential regulator controller 72 which senses throughput before and after the metering valve 78 and at two points in the venturi 75.
  • controller 72 The control thereby supplied from controller 72 is over the full range of flows through the system.
  • the proportioner adds foam of between 0 - 8% at 6000 litres per minute.
  • Another advantage is that the mechanism is a self- contained high pressure foam concentrate to water proportioner powered by water pressure. The proportioning is continuous with the concentrate tanks remaining at atmospheric pressure.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Materials For Medical Uses (AREA)

Abstract

L'invention concerne un dispositif de dosage pour la production d'une mousse, pouvant être utilisé dans un véhicule de lutte contre les incendies, et comprenant une pompe (2, 9, 10), un venturi (A), un dispositif de commande (4) de régulateur à différentiel double, une vanne de dosage (17), un régulateur (11), ces éléments étant disposés de façon que l'eau provenant du réservoir est aspirée par la pompe et envoyée au venturi à partir duquel est déchargé un mélange de mousse et d'eau, ladite mousse étant dosée après son aspiration d'un réservoir à mousse (5), par l'intermédiaire du régulateur, et conduite à la vanne de dosage, vanne à partir de laquelle l'eau concentrée passe dans un venturi qui entoure la pompe, le volume de la mousse étant régulé par le dispositif de commande de régulateur à différentiel double, et la régulation se faisant entre le venturi et le régulateur.
PCT/NZ1994/000041 1993-05-06 1994-05-06 Dispositif de dosage pour la production d'une mousse Ceased WO1994026353A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU65843/94A AU6584394A (en) 1993-05-06 1994-05-06 A foam proportioner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ24756393 1993-05-06
NZ247563 1993-05-06

Publications (1)

Publication Number Publication Date
WO1994026353A1 true WO1994026353A1 (fr) 1994-11-24

Family

ID=19924341

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ1994/000041 Ceased WO1994026353A1 (fr) 1993-05-06 1994-05-06 Dispositif de dosage pour la production d'une mousse

Country Status (2)

Country Link
AU (1) AU6584394A (fr)
WO (1) WO1994026353A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1549401A4 (fr) * 2002-08-02 2007-08-08 Pierce Mfg Inc Systeme de proportionnage de concentre de mousse et procedes destines a des vehicules de sauvetage et de lutte contre les incendies
US9333379B2 (en) 2012-01-27 2016-05-10 Simplex Manufacturing Co. Aerial fire suppression system
US10406390B2 (en) 2016-08-09 2019-09-10 Simplex Manufacturing Co. Aerial fire suppression system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB209210A (en) * 1922-10-13 1924-01-10 William Waters Butler Improved apparatus for blending liquids
US2989123A (en) * 1959-05-08 1961-06-20 Nat Foam System Inc Fire extinguishing foam proportioning system
US3115158A (en) * 1962-03-01 1963-12-24 Sterling Prec Corp Airfoam liquid proportioning system
GB2101000A (en) * 1981-06-03 1983-01-12 Dan Bron A process for mixing liquids in proportional quanties.
BE895218A (fr) * 1982-12-02 1983-03-31 Pitance Gerard Une unite mobile de reaeration des plans d'eau
GB2147056A (en) * 1983-09-21 1985-05-01 Loheat Ltd Liquid proportioning devices
EP0263290A2 (fr) * 1986-10-09 1988-04-13 Total Walther Feuerschutz GmbH Appareil mélangeur automatique à contrôle électronique pour voiture-pompiers
US5009244A (en) * 1989-08-17 1991-04-23 Grindley, Inc. Fire fighting foam mixing system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB209210A (en) * 1922-10-13 1924-01-10 William Waters Butler Improved apparatus for blending liquids
US2989123A (en) * 1959-05-08 1961-06-20 Nat Foam System Inc Fire extinguishing foam proportioning system
US3115158A (en) * 1962-03-01 1963-12-24 Sterling Prec Corp Airfoam liquid proportioning system
GB2101000A (en) * 1981-06-03 1983-01-12 Dan Bron A process for mixing liquids in proportional quanties.
BE895218A (fr) * 1982-12-02 1983-03-31 Pitance Gerard Une unite mobile de reaeration des plans d'eau
GB2147056A (en) * 1983-09-21 1985-05-01 Loheat Ltd Liquid proportioning devices
EP0263290A2 (fr) * 1986-10-09 1988-04-13 Total Walther Feuerschutz GmbH Appareil mélangeur automatique à contrôle électronique pour voiture-pompiers
US5009244A (en) * 1989-08-17 1991-04-23 Grindley, Inc. Fire fighting foam mixing system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT, Accession No. e7763K/15, Class S02; & BE,A,895 218, (NEUCKENS F), 31 March 1983. *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1549401A4 (fr) * 2002-08-02 2007-08-08 Pierce Mfg Inc Systeme de proportionnage de concentre de mousse et procedes destines a des vehicules de sauvetage et de lutte contre les incendies
US9333379B2 (en) 2012-01-27 2016-05-10 Simplex Manufacturing Co. Aerial fire suppression system
US9981150B2 (en) 2012-01-27 2018-05-29 Simplex Manufacturing Co. Aerial fire suppression system
US10369392B2 (en) 2012-01-27 2019-08-06 Simplex Manufacturing Co. Aerial fire suppression system
US11439852B2 (en) 2012-01-27 2022-09-13 Simplex Manufacturing Co. Aerial fire suppression system
US10406390B2 (en) 2016-08-09 2019-09-10 Simplex Manufacturing Co. Aerial fire suppression system
US11717711B2 (en) 2016-08-09 2023-08-08 Simplex Manufacturing Co. Aerial fire suppression system

Also Published As

Publication number Publication date
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