EP2128452A1 - Pompe à jet pour la formation de mousse à air comprimé - Google Patents

Pompe à jet pour la formation de mousse à air comprimé Download PDF

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Publication number
EP2128452A1
EP2128452A1 EP09006154A EP09006154A EP2128452A1 EP 2128452 A1 EP2128452 A1 EP 2128452A1 EP 09006154 A EP09006154 A EP 09006154A EP 09006154 A EP09006154 A EP 09006154A EP 2128452 A1 EP2128452 A1 EP 2128452A1
Authority
EP
European Patent Office
Prior art keywords
jet pump
water
nozzles
jet
nozzle
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
EP09006154A
Other languages
German (de)
English (en)
Other versions
EP2128452B1 (fr
Inventor
Bruno Matzinger
Hansrudolf Riesen
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.)
Vogt AG
Original Assignee
Vogt 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 Vogt AG filed Critical Vogt AG
Publication of EP2128452A1 publication Critical patent/EP2128452A1/fr
Application granted granted Critical
Publication of EP2128452B1 publication Critical patent/EP2128452B1/fr
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C17/00—Hand fire-extinguishers essentially in the form of pistols or rifles
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C31/00—Delivery of fire-extinguishing material
    • A62C31/02—Nozzles specially adapted for fire-extinguishing
    • A62C31/03—Nozzles specially adapted for fire-extinguishing adjustable, e.g. from spray to jet or vice versa
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C31/00—Delivery of fire-extinguishing material
    • A62C31/02—Nozzles specially adapted for fire-extinguishing
    • A62C31/12—Nozzles specially adapted for fire-extinguishing for delivering foam or atomised foam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/02—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid
    • F04F5/04—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being liquid displacing elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/461—Adjustable nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/463—Arrangements of nozzles with provisions for mixing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/466—Arrangements of nozzles with a plurality of nozzles arranged in parallel

Definitions

  • the invention relates to a jet pump, in particular for admixing air to a water, water / foaming agent, wetting agent mixture jet or the like, having a water inlet, an outlet for the water-air mixture and a suction space arranged between inlet and outlet with a Heated nozzle, a catching nozzle and an air inlet.
  • jet pumps are known and can be used as simple pumps for sucking, aspirating or admixing gases or liquids to a flowing liquid.
  • a jet pump can be operated, for example, with water.
  • the water passes through a motive nozzle into the suction chamber. Due to the flow velocity of the water within the motive nozzle, a free water jet is created within the suction space at the mouth of the motive nozzle. Due to the jet velocity, the air present in the suction space is entrained and admixed with the jet, so that a vacuum is created in the suction space arises, which causes a renewed air intake through an air inlet opening.
  • the water jet arrives at the other end of the mixing chamber in a catching nozzle and from there to the outlet of the jet pump.
  • such jet pumps can only absorb a small amount of air, which is why they are not suitable if as much air as possible is to be admixed and, in particular, not if back pressure exists at the outlet.
  • the object of the invention is therefore to provide a jet pump for admixing gas in a water, water / Schaumffen- or wetting agent mixture jet, which mix a larger amount of gas in the trap nozzle foam, compress them in the compression space and can be used universally.
  • the jet pump has at least two parallel driving nozzles, that in front of the inlet openings of the driving nozzles each a traffic cone is arranged, that each motive nozzle is arranged downstream of a separate catching nozzle and the collecting nozzles a common compression space is connected, between the catch nozzles and the compression space a continuous transition is formed.
  • the jet pump according to the invention has at least two parallel drive nozzles, which are traversed by the water.
  • the individual motive nozzles are designed correspondingly smaller than a single motive nozzle. Due to the smaller diameter of the motive nozzles creates a greater flow velocity of the water within the motive nozzles. As the water emerges from the motive nozzles into the common mixing chamber, the resulting jet of water has a greater velocity immediately more air is sucked in.
  • the traffic cone in front of the inlet openings of the driving nozzles there is a turbulence of the water flow, which is thereby converted from an initial laminar into a turbulent flow.
  • the water jet passes to the suction chamber in the collecting nozzles, which are also designed separately for each jet of water.
  • the inlet openings of the collecting nozzles on the mixing chamber are typically larger than the mouth openings of the driving nozzles. This ensures that the air-enriched water, water / foaming agent or wetting agent mixture jet passes completely into the respective catching nozzle.
  • the large turbulence creates a homogeneous, fine-bubble extinguishing foam in the catching nozzle.
  • the catch nozzles open at the end of the jet pump in a common compression space.
  • the transition between catch mouth and compression space is preferably carried out continuously. That is, the inner diameter of the compression space corresponds exactly to the circumference around all catch mouths.
  • the Essr located in the axial center of the compression space, a Ablenkdorn, the Essr inscribes an inscribed circle substantially within the Fangdüsenmündept. This also means that when looking through the central longitudinal axis of the jet pump leading longitudinal section through a catching nozzle and the compression chamber, the catching nozzle wall and the compression space wall a line without a step or forming a paragraph.
  • the water when exiting the catching nozzles and thus when entering the compression space only slightly extend to the side, so that only a small turbulence takes place.
  • the flow velocity ultimately achievable at the outlet of the jet pump on the plate of the hollow jet nozzle is substantially increased compared to the prior art.
  • the counterpressure achievable in the compression space is increased.
  • a high exit velocity is achieved, resulting in a higher throw distance over conventional devices.
  • the deflection mandrel preferably extends over the entire length of the compression space and has a throttle at the jet pump outlet, for example a substantially conical widening, so that only a thin exit gap is formed between the compression space inner wall and the deflection mandrel.
  • the outlet gap can be changed, for example by axial displacement of the compression chamber wall, whereby the pressure and the outlet velocity are adjustable.
  • the throttle is preferably formed integrally with the Ablenkdorn, wherein the transition between Ablenkdorn and throttle also runs continuously, that is, there are no steps or gaps in the flow path, which could represent a flow resistance.
  • a preferred development of the invention provides that the motive nozzles taper conically in the direction of flow. Due to the tapered shape of the individual motive nozzles, the flow rate of the water increases in each nozzle increasingly.
  • the mouth of the motive nozzle to the mixing chamber therefore has a, compared to the connection opening the jet pump to a multiple smaller diameter. The speed at which the water shoots into the mixing chamber is therefore many times greater than with jet pumps with only one cylindrical nozzle.
  • a further embodiment of the invention provides that the catching nozzles have a region in which the diameter increases conically in the direction of flow.
  • the collecting nozzles are usually formed substantially cylindrical over the entire length. However, so that the transition to the compression chamber can be made seamless, it is advantageous if the catching nozzles in the region of the mouth in the compression chamber have a conical enlargement. This allows the compression chamber, despite continuous transition, have a larger volume.
  • the tapering of the driving nozzles and / or the extension of the catching nozzles can also take place in another form, for example exponential or parabolic, but the production of conical openings is simpler.
  • the jet pump according to the invention is optimized for the admixture of gases or liquids to a water jet. However, it can also be used in this form to aspirate or aspirate liquids or gases.
  • An advantageous application of the jet pump according to the invention is the generation of compressed air.
  • This application is particularly suitable for fire departments in extinguishing missions, since with the extinguishing water it is possible to generate compressed air without additional effort.
  • the compressed air can then be used for Löschschaumpunung and / or for the operation of hydraulic tools, such as spreaders or shears. The entrainment of an additional compressor can thus be omitted.
  • the jet pump according to the invention with the output of a water pump, preferably a high-pressure pump, connected, as it is often in use in extinguishing operations.
  • the outlet of the jet pump is connected to a separator in which the air added to the water in the jet pump is again separated from the water.
  • the compressed air thus obtained can be fed via a line and / or distribution system one or more consumers.
  • the separated water can then be used for extinguishing purposes or it is fed back to the pump circuit, so that a re-enrichment can take place with compressed air.
  • the jet pump according to the invention is particularly well suited, in particular by the increased air admixture and the larger outlet pressure.
  • a further embodiment of the invention provides to use the jet pump directly as a fire extinguisher for fire fighting.
  • a beam guide can be arranged at the output of the jet pump in order to control the extinguishing water jet.
  • an axially displaceable sleeve can be pushed onto the compression chamber wall, wherein it is possible to select continuously by displacing the sleeve between full jet and spray jet. Due to the aforementioned advantages, the extinguishing pistol thus formed has an increased throw-out distance, as a result of which targeted extinguishing water use can also take place from larger and therefore safer distances.
  • the amounts of air and foam extract can be controlled on the suction housing, whereby the foam performance is infinitely adjustable.
  • FIG. 1 shows a generally designated 1, inventive jet pump, especially for the fire department use.
  • the jet pump 1 has an inlet 2, on which water can be conducted into the jet pump 1.
  • the water can be in a hose from a normal pressure or high pressure water pump be promoted to the jet pump 1.
  • the inlet 2 can for this purpose have any connection for a hose.
  • the inlet 2 of the jet pump is shown enlarged.
  • the inlet 2 has a circular motive nozzle body 3.
  • an inlet port 4 is arranged accurately to which the hose connection can be arranged and thus forms the interface to a water-supplying unit.
  • nine propulsion nozzles 5 are arranged in a circle around the central longitudinal axis.
  • a traffic cone 6 is arranged, which protrudes to about halfway into the motive nozzle.
  • the individual traffic cones 6 are slotted ( Fig. 6 ) and inserted into the cone of the motive nozzle.
  • the guide pin 7 sits on or in front of the motive nozzle body 3 and directs the inflowing water into the motive nozzles 5.
  • the mandrel 7 has a conically widened shape in the flow direction, wherein the largest diameter corresponds to the inscribed circle 9 of the circularly arranged motive nozzles 5 ( Fig. 3 ).
  • the transition between the guide pin 7 and the driving nozzles 5 is characterized continuously and seamlessly.
  • the traffic cones 6 have a double-cone shape, wherein the input-side cone 10 corresponds in diameter approximately to the inlet opening of the motive nozzle.
  • the diameter is smaller and the motive nozzle cone 11 has a non-conical elongate shape with slots 12 that are 5 degrees off the longitudinal axis ( Fig. 6 ) to produce a swirl and thereby greater turbulence and a concave taper 12, wherein the part of the motive nozzle cone 11 is arranged with the slots 12 coaxially within the motive nozzle 3.
  • the traffic cones 6 cause a turbulence of the incoming water when entering the motive nozzles 5.
  • the motive nozzles 5 are each formed identically, wherein the diameter of the individual motive nozzles compared to the diameter of the inlet nozzle 4 is substantially lower. As a result, the flow velocity of the water within the motive nozzles 5 is greatly increased. A conical taper of the motive nozzle 5 over almost the entire length of the motive nozzle body 3 further enhances this effect.
  • a short cylindrical portion 8 is arranged, which forms the mouth opening, from which the water emerges as a jet from the motive nozzle 5.
  • a gap 18 which forms a suction chamber open to the environment.
  • the strongly accelerated water shoots from the narrow mouth openings 8 of the propellant nozzles 5 in the suction chamber 18 and forms a free jet there.
  • the water jet sucks air from the environment and tears it with it. Due to the turbulent flow of the water, which is generated by the traffic cone 6, creates a turbulence, through which the air also enters the interior of the water jet. This allows the water jet to absorb more air.
  • the suction chamber 18 of the water-air jet enters the opening 17 of the corresponding catching nozzle 15.
  • the opening of the catching nozzle 15 is slightly larger than the mouth opening 8 of the motive nozzle 5, so that the lightly fanned on the route through the suction chamber 18 beam completely can be included.
  • a cylindrical Part where the homogeneous fine bubble foaming agent is formed (foam finishing line).
  • Adjoining the catching nozzles 15 is a compression space 20, which is enclosed by an adjusting cylinder 21 and in which a central guiding mandrel 22 is arranged. Both the adjusting cylinder 21 and the guide pin 22 are connected to the catching nozzle body 14, wherein the adjusting cylinder 21 is displaceable in the axial direction.
  • the compression space 20 is shown enlarged.
  • the central guide pin 22 is adapted with its outer diameter to the inscribed circle of the catching nozzle orifices 23, so that the catching nozzles 15 merge without transition into the compression space 20.
  • the catching nozzles 15 each have a conical widening 19 at their ends, so that the compression space has a larger volume.
  • FIG. 5 shows a cross section through the compression space 20, wherein each remaining between the individual catching nozzle orifices 23, approximately triangular cavities 24 are visible, in which the escaping water can spread. The influence of these cavities 24 is very small.
  • the guide pin 22 tapers in the flow direction approximately conical, whereby the volume of the compression space 20 is increased. As a result, the water jet loses speed, but gains in pressure to the same extent.
  • the mandrel 22 is seamlessly connected to a Ablenkdorn 25, which is designed as a substantially conical broadening of the guide mandrel 22.
  • a gap 26 between the Ablenkdorn 25 and the adjusting cylinder 21 forms a Outlet nozzle for the water-air jet.
  • the driving nozzle body 3 and the catching nozzle body 14 each have a central through-hole, through which a central fastening screw in the thread 13 in the guide pin 22 can be screwed.
  • By at least one locating pin 16 ensures that the catching nozzles 15 are aligned exactly opposite the driving nozzles 5.
  • the Fig. 7 shows an extinguishing pistol 30, which is substantially the in Fig. 1 shown jet pump 1 corresponds.
  • adjustable sleeve 27 is arranged, which serves to regulate the water-air jet. By moving the sleeve 27 in the axial direction of the exiting water-air jet can be adjusted continuously between full and spray.
  • a suction housing 28 is arranged around the suction chamber 18, through which the suction of air is targeted by a suction port 29.
  • FIG. 8 A further embodiment of an extinguishing pistol 38 is shown, which is essentially like the extinguishing pistol 30 of the Fig. 7 is constructed, but at the water inlet side has a gun handle 39 to which a trigger 41, the amount of water is adjustable. At the outlet end, another handle 40 for supporting handling of the extinguishing pistol 38 is arranged.
  • FIG. 9 shows schematically how a jet pump 1 according to the invention can be used in a Löscheinsatz for compressed air generation.
  • a high-pressure pump 32 From at least one water tapping point 31, water is sucked in by a high-pressure pump 32.
  • the Water supply point 31 may be an open water point, a hydrant, a tanker or any other source of water.
  • the high pressure pump 32 may be powered by a normal pressure pump 33 which is supplied from the same or another source of water.
  • the normal pressure pump 33 supplies extinguishing water at a pressure of up to 10 bar.
  • the jet pump 1 according to the invention is coupled to the high pressure pump 32, which has a capacity of up to 400 l / min and 40 bar to 60 bar output pressure.
  • This admixed air is again separated from the water in the separator 34 connected to the outlet of the jet pump 1, the separated air still having a high pressure.
  • the separated water is returned to the inlet of the normal pressure pump 33 or used via a turbo pump 35 for the preparation of a foam extract.
  • the turbo-pump 35 has, for example, a delivery rate of 200 l / min to 400 l / min of water and up to 20 l / min of foam extract, although no large pressure is achieved here.
  • the foam extract is generated via an admixer 36 with pressure regulator and fed to the normal pressure water of the normal pressure pump 33.
  • the water-foam extract mixture is fed to a foam tube 37, which is additionally connected to the compressed-air outlet of the separator 34.
  • the foam extract is foamed by the compressed air and thus processed the compressed air-extinguishing foam.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Nozzles (AREA)
EP20090006154 2008-05-27 2009-05-06 Pompe à jet pour la formation de mousse à air comprimé Ceased EP2128452B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810025325 DE102008025325A1 (de) 2008-05-27 2008-05-27 Strahlpumpenverdichter zum Erzeugen von Druckluftschaum CAFS-(Compressed Air Foam System)

Publications (2)

Publication Number Publication Date
EP2128452A1 true EP2128452A1 (fr) 2009-12-02
EP2128452B1 EP2128452B1 (fr) 2011-01-19

Family

ID=40435598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090006154 Ceased EP2128452B1 (fr) 2008-05-27 2009-05-06 Pompe à jet pour la formation de mousse à air comprimé

Country Status (2)

Country Link
EP (1) EP2128452B1 (fr)
DE (2) DE102008025325A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2471280B (en) * 2009-06-22 2011-08-31 Hydroventuri Ltd Apparatus and method for introducing a gas into a liquid
FR2975917B1 (fr) * 2011-06-06 2014-02-14 Pok Dispositif de generation de mousse d'une lance a incendie
US10058882B1 (en) 2017-10-20 2018-08-28 Kevin J. Quinn High pressure water/foam nozzle assembly
CN109806532B (zh) * 2019-03-13 2024-06-07 吕鹏 一种复合射流灭火喷射装置
DE102021122710A1 (de) 2021-09-02 2023-03-02 Alfred Kärcher SE & Co. KG Treibdüse und flächenreinigungskopf mit einer treibdüse

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR736138A (fr) * 1932-04-29 1932-11-19 Trompe à vide
US2373009A (en) * 1941-06-07 1945-04-03 Pyrenc Dev Corp Fire-foam producing apparatus
US2577451A (en) 1949-02-24 1951-12-04 Standard Oil Dev Co Apparatus for the production of air foam and air foam fire-extinguishing installations
US2946293A (en) * 1955-04-18 1960-07-26 Pyrene Co Ltd Inductors
EP0305251A1 (fr) * 1987-08-07 1989-03-01 E. + M. Lamort Société Anonyme dite: Injecteur mélangeur sous pression
EP1380348A2 (fr) * 2002-07-11 2004-01-14 ALSTOM (Switzerland) Ltd Appareil de pulvérisation et procédé pour créer un mélange liquide-gaz
FR2856603A1 (fr) * 2003-06-26 2004-12-31 Sides Lance a incendie du type a jet modulable

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR736138A (fr) * 1932-04-29 1932-11-19 Trompe à vide
US2373009A (en) * 1941-06-07 1945-04-03 Pyrenc Dev Corp Fire-foam producing apparatus
US2577451A (en) 1949-02-24 1951-12-04 Standard Oil Dev Co Apparatus for the production of air foam and air foam fire-extinguishing installations
US2946293A (en) * 1955-04-18 1960-07-26 Pyrene Co Ltd Inductors
EP0305251A1 (fr) * 1987-08-07 1989-03-01 E. + M. Lamort Société Anonyme dite: Injecteur mélangeur sous pression
EP1380348A2 (fr) * 2002-07-11 2004-01-14 ALSTOM (Switzerland) Ltd Appareil de pulvérisation et procédé pour créer un mélange liquide-gaz
FR2856603A1 (fr) * 2003-06-26 2004-12-31 Sides Lance a incendie du type a jet modulable

Also Published As

Publication number Publication date
EP2128452B1 (fr) 2011-01-19
DE502009000302D1 (de) 2011-03-03
DE102008025325A1 (de) 2009-04-16

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