EP0295202B1 - Dosiervorrichtung zum Beimischen von Additiven zu einem unter Druck stehenden Wasserstrom - Google Patents

Dosiervorrichtung zum Beimischen von Additiven zu einem unter Druck stehenden Wasserstrom Download PDF

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Publication number
EP0295202B1
EP0295202B1 EP88810291A EP88810291A EP0295202B1 EP 0295202 B1 EP0295202 B1 EP 0295202B1 EP 88810291 A EP88810291 A EP 88810291A EP 88810291 A EP88810291 A EP 88810291A EP 0295202 B1 EP0295202 B1 EP 0295202B1
Authority
EP
European Patent Office
Prior art keywords
additive
pipe
control valve
valve
pressure
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 - Lifetime
Application number
EP88810291A
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German (de)
English (en)
French (fr)
Other versions
EP0295202A2 (de
EP0295202A3 (en
Inventor
Peter Dr. Hermann
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.)
Tony Brandle AG
Original Assignee
Tony Brandle AG
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 Tony Brandle AG filed Critical Tony Brandle AG
Priority to AT88810291T priority Critical patent/ATE84234T1/de
Publication of EP0295202A2 publication Critical patent/EP0295202A2/de
Publication of EP0295202A3 publication Critical patent/EP0295202A3/de
Application granted granted Critical
Publication of EP0295202B1 publication Critical patent/EP0295202B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/311—Injector mixers in conduits or tubes through which the main component flows for mixing more than two components; Devices specially adapted for generating foam
    • B01F25/3111—Devices specially adapted for generating foam, e.g. air foam
    • B01F25/31114—Devices specially adapted for generating foam, e.g. air foam with means for introducing an additional component, e.g. in predetermined proportion or in the main component

Definitions

  • the invention relates to a metering device for admixing additives to a pressurized water stream in a water pipe.
  • Dosing devices of this type are used above all in fire-fighting systems in which fire-fighting with extinguishing water alone is often not sufficient. In many cases, it is therefore necessary to mix the extinguishing water with a foam or another additive, for example.
  • the additive is added to the water flow by means of a pump which can be driven by a hydraulic motor.
  • the pump is controlled indirectly via a servo control valve, which reacts to pressure differences between the water pressure and the additive pressure. Dosing valves in the additive lines are provided before they enter the water line, but they are not controlled by the system.
  • the control of the dosing valve for additives should take place via the system. It is also advisable to pump the additive using a pump.
  • the known metering devices take too little account of the strong pressure fluctuations in the water flow and the associated effects on the regulation.
  • the control loop should also remain stable and react quickly to control deviations.
  • the pressure differential valve ensures that the pressure drop across the control valve remains largely constant even when the pressure in the additive line or in the water line changes.
  • the constant pressure difference has a positive effect on the control characteristics, so that there are no significant fluctuations in the desired mixing ratio.
  • the feed pump must have a greater delivery capacity when the control valve is fully open, so that the maximum amount of additive has to be delivered. If the control valve is only slightly open, it is not necessary for the feed pump or the drive device to be operated at the maximum output. An output corresponding to the actually required delivery quantity is sufficient, which saves energy and reduces noise.
  • Another advantage of adapting the delivery rate is that the additive does not heat up unnecessarily. The excess amount delivered has to be returned, which is associated with warming.
  • the controller forms the corresponding control signal from the amount of additive fed to the control valve and from the total amount of mixture in order to maintain the desired mixing ratio. Any fluctuations in the quantity of extinguishing water supplied to the metering device are also taken into account.
  • the control which is dependent on the required delivery rate, can be implemented particularly easily if the drive device is a gasoline engine with a speed controller assigned to the delivery pump and if the speed controller is connected to the control valve with a cable or with a linkage such that the speed increases with increasing valve opening .
  • the speed of the petrol engine can be regulated in a known manner via the throttle valve on the carburetor.
  • the position-dependent change in position on the control valve can be optimally transferred to the speed controller on the petrol engine using a cable or a linkage. With only a minimally opened control valve, the petrol engine therefore only runs at a minimal speed, which means that petrol consumption can be significantly reduced.
  • the drive device is a power take-off of a non-system main drive and if the speed of the power take-off can be controlled in stages or continuously with a gearbox that is controlled by the control valve.
  • the feed pump does not necessarily need its own drive unit. The feed pump is simply sufficient to connect to a power take-off.
  • the feed pump can be coupled to the power take-off via a gearbox, which changes the speed depending on the position of the control valve.
  • the above-mentioned return of excess conveyed additive can be further optimized in that a return line is connected to the additive line between the feed pump and the additive measuring device, which return line leads to the additive source and if an overpressure valve is arranged in the return line which, when a predetermined pressure is exceeded opens in the additive line and in this way returns the additive from the additive line to the additive source.
  • the recycling of excess additive to the additive source is also shown in the aforementioned US Pat. No. 4,324,294.
  • the return is not solved there in this simple way.
  • the amount of additive is even controlled by a control valve which is arranged in the return line. An attempt is made to maintain a constant mixing ratio by increasing or reducing the amount of additive returned. However, this is uneconomical because the feed pump must always be operated at full capacity.
  • a particularly versatile application of the metering device results when the additive source is an additive tank and when a directional valve is arranged in the additive line in front of the feed pump and can be switched from the additive tank to at least one additional additive line that leads to an external additive source. In this way, it is possible to switch over to another additive for a short time without switching off the system, which additive is also carried in a tank or which is extracted, for example, from a canister or barrel. Depending on the number of connections of the directional control valve, different additives could even be added alternately.
  • the water pipe 1 has two water connections 34, to which e.g. a hydrant or the outlet of a water pump can be connected.
  • An additive line 2 leads to the water line 1, where the additive is mixed into the water flow via a mixing device 28.
  • the mixing device can e.g. be a ring line which extends around the inner wall of the water line 1 and feeds the additive in a circular shape into the water flow.
  • the mixture is available in the desired mixing ratio at the two mixture connections 35.
  • a control valve 3 is arranged in the additive line 2.
  • This control valve is connected to an actuator 4, which receives 8 control pulses from a controller.
  • the desired mixing ratio can be set on an operating panel 9.
  • An additive measuring device 6 is installed in the additive line for determining the actual mixing ratio or for readjustment in the event of deviations from the desired state. This measures the amount of additive supplied to the control valve 3.
  • the total amount of mixture is in the water line 1 via a mixture measuring device 7 determined.
  • the signals from the two measuring devices 6 and 7 are each fed to a transducer 10 and 11, which emit signals proportional to the flow rate to the controller 8.
  • the structure and function of this controller are essentially already described in EP-A-230 860.
  • a pressure differential valve 5 is connected in the additive line 2 upstream of the control valve 3.
  • a control line 23 determines the pressure after the control valve 3, which can fluctuate depending on the water pressure in the water line.
  • This control pressure allows the pressure differential valve to keep a previously adjustable pressure drop of example 1 bar constant.
  • the water pressure at the water connections 34 can be set, for example, from 0 to 12 bar. This pressure is determined on a pressure gauge line 12 and can be read off on the control panel.
  • the additive is removed from an additive tank 16 and conveyed with a feed pump 17.
  • the feed pump 17, for example a diaphragm piston pump, is connected to a gasoline engine 18.
  • the petrol engine with an output of 11 hp, for example, is supplied with fuel from a fuel tank 22.
  • a starting device 21, which can be actuated from the control panel 9, is used to start the gasoline engine.
  • the gasoline engine 18 is provided with a speed controller 19 which controls the speed from, for example, 2000 to 4200 rpm. can regulate.
  • the speed controller is connected via a cable 20 to the control valve 3 or to its spindle. A displacement of the valve spindle therefore results in the speed controller being actuated.
  • the maximum speed of the gasoline engine 18 is reached with the control valve 3 fully open. Instead of the cable, a linkage would also be conceivable.
  • the speed controller 19 could also have other commands, for example electrical or optical signals, control commands from the control valve 3 or from it Get actuator 4.
  • a return line 24 is connected to the additive line 2.
  • This return line is provided with an overpressure valve 25, which can be set so that it responds to a desired overpressure.
  • the pressure in the additive line 2 can be read on the manometer 29. If a certain pressure of, for example, 15 bar is exceeded in the additive line, the pressure relief valve 25 opens and leads the unnecessary additive back into the additive tank 16.
  • the pressure relief valve 25 can be bridged with a handle, so that the entire pumped by the feed pump 17 for starting The amount of additive flows back to the additive tank 16. As soon as the feed pump 17 is operating normally and the desired operating pressure has been reached, the pressure relief valve 25 is switched to operation so that it only responds at the desired pressure.
  • a directional valve 26 is switched into the additive line 2, which can be switched from the feed tank 16 to at least one additional additive line 27.
  • an alternative additive can be pumped out of a drum 36 without interrupting operation by operating the directional valve 26.
  • the mixing ratio that can be programmed on the control panel 9 is, for example, zero to ten percent additive of the total flow rate determined with the mixture measuring device 7.
  • the amount of mixture can, for example, 180 to 2000 l / min. be.
  • the feed pump 17 can be provided with a pulsation damper 37 which detects the pressure compensates for bumps in the additive line 2.
  • the pressure differential valve 5 is generally set by the manufacturer and does not have to be adjusted later. When the delivery rate in the additive line 2 drops, the pressure difference can increase, for example, 1 bar at 100 l / min. to 2.5 bar at less than 10 l / min. With the normal delivery rates in the additive line 2, however, the pressure difference remains largely constant.
  • the feed pump 17 is driven by a power take-off 31 of a main drive 32 which is not related to the system.
  • This main drive can be, for example, the engine of a fire engine, which also drives hydraulic units, pumps, etc.
  • the delivery pump 17 is coupled to the power take-off 31 via a gear stage 30.
  • This gear stage 30 can change the speed of the power take-off 31 in a suitable manner such that the maximum speed is only reached when the control valve 3 is fully open.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Accessories For Mixers (AREA)
  • Control Of Non-Electrical Variables (AREA)
  • Paper (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Cable Accessories (AREA)
  • Nozzles (AREA)
EP88810291A 1987-06-10 1988-05-04 Dosiervorrichtung zum Beimischen von Additiven zu einem unter Druck stehenden Wasserstrom Expired - Lifetime EP0295202B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810291T ATE84234T1 (de) 1987-06-10 1988-05-04 Dosiervorrichtung zum beimischen von additiven zu einem unter druck stehenden wasserstrom.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2177/87 1987-06-10
CH2177/87A CH673091A5 (enrdf_load_stackoverflow) 1987-06-10 1987-06-10

Publications (3)

Publication Number Publication Date
EP0295202A2 EP0295202A2 (de) 1988-12-14
EP0295202A3 EP0295202A3 (en) 1989-11-23
EP0295202B1 true EP0295202B1 (de) 1993-01-07

Family

ID=4227692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810291A Expired - Lifetime EP0295202B1 (de) 1987-06-10 1988-05-04 Dosiervorrichtung zum Beimischen von Additiven zu einem unter Druck stehenden Wasserstrom

Country Status (4)

Country Link
EP (1) EP0295202B1 (enrdf_load_stackoverflow)
AT (1) ATE84234T1 (enrdf_load_stackoverflow)
CH (1) CH673091A5 (enrdf_load_stackoverflow)
DE (1) DE3877264D1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9818798D0 (en) * 1998-09-01 1998-10-21 Watkins Ivor Improvements relating to water treatment
AT501355B1 (de) * 2005-02-08 2006-12-15 Rosenbauer Int Ag Schaumlöschvorrichtung und verfahren zu dessen betrieb
CH703784A1 (de) 2010-09-06 2012-03-15 Braendle Tony Ag Dosiervorrichtung.
CN112138602A (zh) * 2020-10-12 2020-12-29 李艳秋 一种尘土抑制剂加入装置

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3047003A (en) * 1960-04-18 1962-07-31 Gamewell Co Flow proportioning system for foam producing apparatus
US4007755A (en) * 1974-01-18 1977-02-15 Sun Oil Company Of Pennsylvania Component injection system
FR2273315A1 (en) * 1975-01-17 1975-12-26 Sun Oil Co Pennsylvania Controlled injection of additive fluid into main fluid - e.g. addn of odoriser into liquefied fuel gases
US4324294A (en) * 1979-02-07 1982-04-13 John McLoughlin Chemical injection control system for fire fighting
US4420047A (en) * 1981-12-28 1983-12-13 Lockheed Corporation Stowable fire suppression system for aircraft cabins and the like
US4436487A (en) * 1982-06-29 1984-03-13 Enterra Corporation Foam liquid concentrate supply system
FR2586307B1 (fr) * 1985-08-19 1988-09-16 Sfr Sa Robinetterie Ensemble de prelevement et de regulation du debit et de la pression d'un liquide

Also Published As

Publication number Publication date
DE3877264D1 (de) 1993-02-18
ATE84234T1 (de) 1993-01-15
CH673091A5 (enrdf_load_stackoverflow) 1990-02-15
EP0295202A2 (de) 1988-12-14
EP0295202A3 (en) 1989-11-23

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