EP3003541B1 - Foam generation device - Google Patents

Foam generation device Download PDF

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Publication number
EP3003541B1
EP3003541B1 EP13727228.2A EP13727228A EP3003541B1 EP 3003541 B1 EP3003541 B1 EP 3003541B1 EP 13727228 A EP13727228 A EP 13727228A EP 3003541 B1 EP3003541 B1 EP 3003541B1
Authority
EP
European Patent Office
Prior art keywords
foaming
foam
section
generating apparatus
flow channel
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.)
Active
Application number
EP13727228.2A
Other languages
German (de)
French (fr)
Other versions
EP3003541A1 (en
Inventor
Thomas Fiack
Jürgen Binder
Andreas Schwarz
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.)
Alfred Kaercher SE and Co KG
Original Assignee
Alfred Kaercher SE and Co KG
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 Alfred Kaercher SE and Co KG filed Critical Alfred Kaercher SE and Co KG
Publication of EP3003541A1 publication Critical patent/EP3003541A1/en
Application granted granted Critical
Publication of EP3003541B1 publication Critical patent/EP3003541B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0018Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam
    • B05B7/005Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam wherein ambient air is aspirated by a liquid flow
    • B05B7/0056Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam wherein ambient air is aspirated by a liquid flow with disturbing means promoting mixing, e.g. balls, crowns
    • B05B7/0062Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam wherein ambient air is aspirated by a liquid flow with disturbing means promoting mixing, e.g. balls, crowns including sieves, porous members or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20Mixing gases with liquids
    • B01F23/23Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/235Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/311Injector mixers in conduits or tubes through which the main component flows for mixing more than two components; Devices specially adapted for generating foam
    • B01F25/3111Devices specially adapted for generating foam, e.g. air foam
    • B01F25/31112Devices specially adapted for generating foam, e.g. air foam with additional mixing means other than injector mixers, e.g. screen or baffles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3121Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/316Injector mixers in conduits or tubes through which the main component flows with containers for additional components fixed to the conduit
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40Static mixers
    • B01F25/45Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4521Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through orifices in elements, e.g. flat plates or cylinders, which obstruct the whole diameter of the tube
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40Static mixers
    • B01F25/45Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads
    • B01F25/452Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces
    • B01F25/4523Mixers in which the materials to be mixed are pressed together through orifices or interstitial spaces, e.g. between beads characterised by elements provided with orifices or interstitial spaces the components being pressed through sieves, screens or meshes which obstruct the whole diameter of the tube
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00Other mixers; Mixing plants; Combinations of mixers
    • B01F33/50Movable or transportable mixing devices or plants
    • B01F33/501Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use
    • B01F33/5011Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use portable during use, e.g. hand-held
    • B01F33/50114Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use portable during use, e.g. hand-held of the hand-held gun type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/244Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using carrying liquid for feeding, e.g. by suction, pressure or dissolution, a carried liquid from the container to the nozzle
    • B05B7/2443Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using carrying liquid for feeding, e.g. by suction, pressure or dissolution, a carried liquid from the container to the nozzle the carried liquid and the main stream of carrying liquid being brought together downstream of the container before discharge

Definitions

  • the invention relates to a foam-generating device, in particular as an accessory for a high-pressure cleaning device, which comprises or forms a flow channel and a nozzle body having an outlet opening and a frothing element, which has a frothing section arranged in the flow channel upstream of the outlet opening, wherein a frothable detergent through the Flow channel to the outlet opening and is foamed when passing through the AufMumabterrorism, wherein the nozzle body at the outlet opening comprises a beam forming element for forming a flat jet of the foamed detergent, wherein the foam generating device comprises a sieve element having a sieve section arranged in the flow channel, wherein the sieve section downstream the AufMumabêtes and in the distance to this and upstream of the beam-shaping elements s is arranged and wherein the screen section has through openings which are smaller than the passage openings of the foaming section.
  • a foaming device serves to provide a foamed cleaning agent (cleaning foam) in order to achieve a good cleaning effect.
  • the device may in particular be an accessory for a high-pressure cleaning device and be connected, for example, with its blasting gun or jet pipe, so that the cleaning effect of the high-pressure cleaning device can be increased by using the foam-generating device.
  • the foamable cleaning agent is in particular a mixture of a carrier liquid, especially water, and one of these blended cleaning chemical. It is preferably a homogeneous mixing of the cleaning chemical and the carrier liquid.
  • the foamable cleaning agent additionally contains, in particular, air which, for example, flows upstream of the foam Foaming element enter the flow channel and can be supplied to the mixture.
  • the cleaning agent may be provided in the foaming device or may already be supplied in mixed form.
  • the foaming element generates a dynamic pressure in the flow channel, so that upon passage of the cleaning agent through the foaming section, turbulences occur which lead to the formation of foam.
  • the nozzle body is provided with the beam-shaping element in the generic foam-generating device.
  • the cleaning foam can be dispensed as a flat jet, which is arranged substantially in one plane and in particular spreads in a fan-shaped manner.
  • a foaming device is in the EP 1 852 190 B1 described.
  • the foaming element used is, for example, a perforated plate, a sieve, pressed steel wool or an open-pored metal foam.
  • the passage openings or even pores of the foaming section must be so small that a large back pressure is created upstream of the foaming section. This results in foaming upstream of the frothing member, and foam may undesirably leak laterally from the foam generator.
  • the passage openings must therefore be so large that this lateral leakage of foam can be avoided.
  • cleaning foam with a relatively large bubble size is formed downstream of the foaming section. This less stable cleaning foam breaks down faster and has a lower cleaning effect.
  • the beam profile of the flat jet is affected by the larger air bubbles in the foam.
  • the US 3,388,868 describes a foam-producing device of the type mentioned for spraying herbicides.
  • a foaming device for use in fire fighting is in the US 2,492,037 described. Foam is emitted with a conically widening jet in order to achieve the widest possible distribution, or as a concentrated, powerful spot beam.
  • the object of the present invention is to provide a generic foaming device with which a cleaning foam with a better cleaning effect can be produced.
  • a dynamic pressure can be generated by using the frothing element in the flow channel, and when passing through the frothing section, the cleaning agent is foamed.
  • the foamed cleaning agent is foamed.
  • screen section air bubbles in the cleaning foam can be reduced. This is made possible by the passage openings of the screen section being smaller than those of the foaming section, in particular having a smaller cross section than the latter.
  • the reduction of the bubbles leads to an increase in the volume and to a solidification of the foam, so that this can have a high dimensional stability downstream of the screen section. Due to the high dimensional stability, a flat jet with good beam profile can be generated with the beam-shaping element.
  • the foam generating device By using the foam generating device, a jet having a good jet profile and cleaning foam having a high cleaning effect can thereby be produced.
  • the screen element in addition to the foaming element, it is different than in the EP 1 852 190 B1 described foam generating device it is not necessary to produce a dimensionally stable cleaning foam when the cleaning agent passes through alone with the foaming element. Rather, this can be ensured in a second step by the presence of the sieve element.
  • the foaming section and / or the sieve section it proves to be advantageous for the foaming section and / or the sieve section to have a central, opening-free region which is free of passage openings and which is surrounded by passage openings.
  • "central” refers to an arrangement of the opening-free region in the middle or essentially in the middle of the flow channel. Through the central opening-free region, the passage of the cleaning agent and of the foam through the foaming section and / or the sieve section is displaced in the direction of a wall of the flow channel. The amount of centrally flowing through the flow channel detergent and foam is thereby reduced. This proves to be advantageous for the shaping of the flat jet by the beam-shaping element. As a result, a better steel profile can be provided thereby.
  • the opening-free region at the foaming section is, for example, approximately 30% of its diameter and approximately 5% to 15% of its diameter on the wire section, in each case based on a circular configuration of the foaming section or the sieve section.
  • the mean distance of the wire section from the foaming section is approximately 15% to 35% of the diameter of the wire section, based on a circular configuration of the wire section.
  • the average distance is about 25% of the diameter of the wire section.
  • the cross-section of the through-openings of the foaming-up section is approximately four times to eight times as large as the cross-section the passage openings of the wire section, preferably about five to six times as large.
  • the diameter of the through holes of the AufMumabiteses about 1 millimeter to 1.5 millimeters, for example, 1.2 millimeters.
  • the diameter of the passage openings of the screen section may be, for example, about 0.3 to 0.7 millimeters, for example 0.5 millimeters.
  • the number of through holes of the wire section is about five times to ten times as high as the number of through holes of the foaming section.
  • the passage openings of the foaming and / or the screen section can be aligned around and / or parallel to each other.
  • the passage openings of the foaming and / or the Siebabiteses are axially aligned, along or parallel to an axis defined by the foam generating device, along which the flow channel extends.
  • the foaming section and / or the wire section are designed as perforated plates.
  • a foaming space for the cleaning agent is preferably formed, in which the cleaning agent passing through the foaming section can be foamed.
  • At least one wall is provided which limits the foaming space transversely to the flow direction of the cleaning agent.
  • this can be understood in particular to mean that the foaming space is delimited along the flow channel of the foaming section and the screen section and in the circumferential direction of the at least one wall. Due to the limitation by the at least one wall, it can be avoided that foam escapes from the foaming space, bypassing the sieve section. Instead, the foam is allowed to pass through the wire section as intended.
  • the foaming element and / or the sieve element comprise or form the at least one wall.
  • a structurally simple embodiment can be achieved.
  • the foaming element or the sieve element interlock and each comprise or form a wall, the walls abutting one another in the circumferential direction of the foaming space.
  • the AufJumraum can be limited by a double-walled.
  • the foaming space can be reliably sealed transversely to the direction of flow.
  • it can largely be avoided that foam undesirably escapes from the foaming chamber, bypassing the sieve section.
  • the foaming section has a central projecting area projecting in the direction of the screen section and / or if the screen section has a central projecting area projecting in the direction of the foaming section.
  • the protrusion area similar to the opening-free area, allows the passage of detergent and foam through the frothing section and the screen section to be displaced toward a wall of the flow channel. This is advantageous for the formation of the flat jet with the beam-shaping element.
  • the respective projecting area can be, for example, in the form of a pin, a cone or a socket.
  • the foaming section and / or the screen section may have a curvature or curvature in the direction of flow of the cleaning agent.
  • the curvature or curvature is, for example, dome-shaped, in particular spherical cap-shaped, or cone-shaped.
  • the cross-section of the flow channel downstream of the wire section continuously tapers in the direction of the beam-shaping element. This proves to be favorable in order to form a flat beam with a good profile with the beam-shaping element.
  • the foaming element and the sieve element are preferably formed separately from one another and connected to one another. This facilitates on the one hand the mounting of the foam generating device.
  • the foaming element and the sieve element can be provided, for example, connected together as a preassembled structural unit and inserted into the flow channel. On the other hand, a relative movement of the foaming and the sieve element can be avoided and their relative position can be maintained by arrangement in the flow channel. This is advantageous for providing a foam of timeless quality.
  • the foaming element and the sieve element are connected to one another, for example, by latching, wherein additionally or alternatively, jamming is also possible.
  • the foaming and the sieve element have cooperating latching elements which form a latching device.
  • latching projection is provided, which engages in a corresponding latching receptacle.
  • the latching projection is for example a bead which engages in a corresponding receptacle in the form of a groove.
  • the foaming element and the sieve element each have a wall facing the wall of the flow channel edge and if the foaming element and the sieve element at the edges, preferably along the entire edges, are interconnected.
  • the connection at the edge, preferably along the entire edge and preferably immediately adjacent to the wall of the flow channel, makes it possible to design the passable from the detergent free cross section of the foaming element and the screen element as large as possible.
  • the foaming element and the sieve element can each be formed separately from the flow channel and inserted into it.
  • the foaming element and / or the sieve element inserted into the flow channel insertion elements which are supported against a stop on the flow channel against the flow direction of the cleaning agent.
  • the stop is for example a shoulder, in particular an annular shoulder, on a wall of the flow channel, on which the sieve element and / or the foaming element can rest.
  • At least one clamping element is arranged on the foaming element and / or on the screen element for clamping with a wall of the flow channel.
  • the foaming element and / or the sieve element can be clamped in the flow channel (also in the connected state).
  • an interference fit for the frothing element and / or the sieve element can be ensured via the clamping element, thereby ensuring a reliable seat and a defined relative position to the flow channel even with fluctuating fluid pressures.
  • the foaming and / or the sieve element are clamped in the nozzle body, which can form a portion of the flow channel.
  • the at least one clamping element is preferably arranged along an entire wall of the flow channel facing the edge of the foaming element and / or the screen element and clamped to the wall. This allows for a reliable mounting of the foaming element and / or the sieve element.
  • the at least one clamping element can form a sealing element. As a result, it can be avoided that cleaning agent or foam flows laterally past the foaming section and / or on the screen section through the flow channel.
  • the foaming element and / or the sieve element is designed in one piece, in particular as a plastic molded part. This allows a cost-effective and structurally simple production of the foaming and / or the sieve element.
  • the foam generating device conveniently defines an axis about which the nozzle body is rotatable. Thereby, the plane of the flat jet can be rotated, whereby the foam generating device is more versatile.
  • the foaming element and the sieve element are preferably held against rotation on the nozzle body so that they can be rotated together with the latter during its rotation.
  • At least one inlet opening for air, which is admixable with the cleaning agent, is formed on the flow channel upstream of the foaming element.
  • the flow channel upstream of the frothing element expediently comprises a nozzle arrangement with which the cleaning agent in the flow channel can be accelerated and forms a storage space immediately upstream of the frothing element, the flow channel continuously expanding in the stowage space in the direction of the frothing element.
  • the nozzle assembly has a tapered portion in which the cleaning agent is accelerated.
  • the storage space which widens continuously in the direction of the immediately following downstream expansion element, can adjoin the section.
  • the nozzle arrangement is preferably arranged downstream of an injector of the foam-generating device, with which a cleaning chemical of the carrier liquid can be added.
  • the foam generating device may comprise a connection device for connecting a detergent container and an admixing device, via which a cleaning chemical from the detergent container can be sucked in and a carrier liquid can be mixed in the flow channel. Conveniently, an adjustment is provided, with which the amount of blended cleaning chemical can be adjusted. As already mentioned, in particular water is used as the carrier liquid.
  • the admixing device preferably allows homogeneous mixing of the carrier liquid and the cleaning chemical. Downstream of the mixing device, the above-mentioned nozzle arrangement may be arranged on the flow channel or form part of it. Furthermore, downstream of the mixing device, at least one inlet opening for air can be formed for mixing into the cleaning agent at the flow channel.
  • the admixing device preferably comprises a venturi injector.
  • the foam generating device comprises a connecting device for connecting to a high-pressure gun or a jet pipe of a high-pressure cleaning device.
  • FIG. 1 shows a perspective view of a preferred embodiment of a total occupied by the reference numeral 10 foam generating device and connected to this detergent container 12.
  • the foam generating device 10 has a base 14, formed as a jet pipe 16.
  • a flow channel 18 is formed, through which a fluid can flow.
  • a connecting device 20 is arranged on the base body 14.
  • the foam-generating device 10 can be connected to a not shown in the drawing high-pressure cleaning device, as the accessories it can be used.
  • the foam-generating device 10 is connected to a blasting gun or to a jet pipe of the high-pressure cleaning device. From the high pressure cleaning device can the foam-generating device 10, a cleaning carrier liquid are provided, in this case in particular water.
  • the foam-generating device 10 has an admixing device 22, via which a cleaning chemical from the detergent container 12 can be added to the carrier liquid.
  • the mixing device 22 comprises a known per se and not shown in detail in the drawing Venturi injector 24 which is arranged in the flow channel 18. About the venturi injector 24, the cleaning chemical can be sucked by means of a present tubular suction line 26 from the detergent container 12 and mixed with the carrier liquid.
  • the mixture is referred to below as a cleaning agent and is preferably homogeneous.
  • the foam-generating device 10 has a connection device 28, which in the present case is integrally formed on the jet pipe 16.
  • the detergent container 12 can be detachably connected, in particular manually and without tools.
  • the foam-generating device 10 Downstream of the mixing device 22, the foam-generating device 10 comprises a nozzle body 30.
  • the nozzle body 30 surrounds the jet pipe 16 on its side facing the mixing device 22. Furthermore, the nozzle body 30 forms an end of the foam-generating device 10 opposite the connecting device 20.
  • the nozzle body 30 comprises a beam-shaping element 32, which forms an outlet opening 34.
  • the beam-shaping element 32 is shaped so that the outlet opening 34 has an approximately lenticular shape in plan view. Accordingly, the beam-shaping element 32 is approximately provided with the shape of opened lips.
  • a flat jet of the cleaning agent can be dispensed from the nozzle body 30, in which case the cleaning agent is arranged essentially in one plane and spreads in a fan-shaped manner in particular.
  • the cleaning agent is foamed in the flow channel 18 in a manner which will be explained below.
  • the foam generator 10 defines an axis 36 along which the flow channel 18 extends.
  • the nozzle body 30 is rotatably supported on the jet pipe 16 about the axis 36. As a result, the plane of the flat jet can be rotated.
  • the nozzle body 30 Preceding the beam-shaping element 32, the nozzle body 30 forms a section 38 of the flow channel 18.
  • the section 38 comprises a wall of the flow channel 18, with a wall 40.
  • the beam shaping element 32 upstream upstream forms the wall 40 a stop 42 which is opposite to the flow direction of the cleaning agent through the flow channel 18 acts.
  • the stop 42 is configured as an annular shoulder 44 in the circumferential direction of the axis 36.
  • the flow direction of the cleaning agent is symbolized by an arrow 46 in the drawing.
  • the flow channel 18 is formed by a nozzle arrangement 48 except for the jet pipe 16 and the nozzle body 30.
  • the nozzle assembly 48 is placed on the side facing the portion 38 on the jet pipe 16 and fluid-tightly connected thereto.
  • the nozzle arrangement 48 in turn is surrounded on the outside by the nozzle body 30, wherein a gap 50 is formed between the nozzle body 30 and the nozzle arrangement 48.
  • FIG. 2 shows two illustrated by dashed lines inlet openings 54. Between an outer wall 56 of the nozzle body in the region of the section 38 and the wall 40 inlet openings 58 on the nozzle body 30 are formed (in FIG. 2 shown by dashed lines). Through the inlet openings 58, air can be supplied to the intermediate space 50 and via this to the flow channel 18. For sucking in the air, it is advantageous that the flow channel 18 tapers upstream of the end section 52. As a result, a defined point jet of the cleaning agent can be generated, which causes the air intake on entering the nozzle arrangement 48.
  • the nozzle assembly 48 includes the end portion 52 in the flow direction 46 downstream of a tapered portion 60 and a subsequent section 62 of constant cross-section. In section 62, the cross section of the nozzle assembly 48 is minimal. The section 62 is followed by an expanding section 64 in the flow direction 46. The section 64 expands continuously in the flow direction 46 and encloses a section of the flow channel 18 designated below as a storage space 66.
  • the cleaning agent is accelerated through the nozzle assembly 48 and relaxes in the storage space 66, wherein it encounters an increase in pressure on a AufMumelement 68, which is arranged in the flow channel 18. Downstream of the frothing element 68 in the flow direction 46 is a screen element 70, which is likewise arranged in the flow channel 18.
  • the frothing element 68 has a frothing section 72, which is arranged transversely to the flow direction 46 in the flow channel 18 and is configured as a perforated plate 74.
  • the perforated plate 74 has on the outside an edge 76 which faces the wall 40.
  • the perforated plate 74 has a curvature in the flow direction 46, essentially the shape of a section of a spherical cap.
  • the foaming section 72 is arranged further downstream at the edge of the foaming section 72.
  • the central region 78 comprises approximately 30% of the diameter of the round foaming section 72.
  • a projection area 80 is arranged on the central area 78. At the projection area 80, the contour of the perforated plate 74 deviates from the spherical cap.
  • the projection region 80 is in the form of a pedestal, approximately disc-shaped and directed onto the sieve element 70.
  • the central region 78 is surrounded by a multiplicity of passage openings 82 of the foaming section 72.
  • the passage openings 82 are round and designed, for example, as bores of the foaming section 72. They extend parallel to the axis 36. Overall, there are approximately 30 through-holes 82 which surround the central region 78 in two rows. The diameter of the through holes 82 is about 1 millimeter to 1.5 millimeters, for example, 1.2 millimeters.
  • the rim 76 has an edge portion 84 which faces the portion 64 of the nozzle assembly 48.
  • the edge portion 84 is annular, extending around the axis 36 along the entire circumference.
  • the edge portion 84 forms a clamping element 86, via which the foaming element 68 can be fixed in the flow channel 18 in a clamping manner.
  • the clamping element 86 clamped to the wall 40.
  • the clamping element 86 is designed deformable and has in relation to the diameter of the flow channel 18 is an oversize (in FIG. 4 symbolized by a dashed contour 88). If the foaming element 68 is inserted into the flow channel 18 during assembly, the clamping element 86 deforms and is clamped to the wall 40 via a press fit. As a result, a particularly reliable fixation of the foaming element 68 is achieved.
  • the edge portion 84 also forms a sealing element.
  • the sealing element ensures that cleaning agent is not on the side of the Foaming element 68 passes through the flow channel 18, but only through the foaming section 72 therethrough.
  • the edge 76 comprises an edge portion 90.
  • the edge portion 90 is radially inwardly disposed with respect to the edge portion 84 and sleeve-shaped, wherein it extends around the axis 36 along the entire circumference.
  • a receptacle 92 is disposed at the edge 76 between the edge portions 84 and 90.
  • the receptacle 92 is a latching receptacle and in the present case designed as an annular groove 94, which is arranged along the entire outer circumference of the frothing element 68.
  • the sieve element 70 comprises a sieve section 96 arranged in the flow channel 18.
  • the sieve section 96 is aligned transversely to the flow direction 46 and designed as a perforated plate 97.
  • the screen section 96 has a curvature, approximately in the form of a conical jacket.
  • the sieve section 96 is surrounded on the outside by an edge 98 of the sieve element 70.
  • a central region 100 is arranged. At the central region 100, the strainer section 96 is free of passage openings. The central region extends over approximately 10% to 15% of the diameter of the round mesh section 96.
  • a plurality of through holes 102 surround the central region 100. The through holes 102, for example bores, are aligned parallel to one another and parallel to the axis 36.
  • the passage openings 102 have a diameter of approximately 0.3 millimeters to 0.7 millimeters and, for example, approximately 0.5 millimeters. Overall, in the present case about 200 to 250 through holes 102 are present. Thus, the number of through holes 102 exceeds that of the through holes 82 considerably.
  • the passage openings 102 are also smaller than the passage openings 82, in the present case considerably smaller, the cross section being approximately one fifth to one sixth of that of the passage openings 82.
  • a projection region 103 is arranged on the central region 100.
  • the screen portion 96 includes a pin-shaped projection in the direction of the foaming portion 72. The projection is coaxially aligned with the projecting portion 80.
  • the edge 98 forms a support element 104, via which the sieve element 70 can be supported on the annular shoulder 44 against the flow of the cleaning agent.
  • the edge 98 comprises an edge portion 106 on the wall 40 facing side.
  • the edge portion 106 is sleeve-shaped and closed in the circumferential direction of the axis 36.
  • the edge portion 106 is disposed radially outside of the edge portion 90 and is applied to this.
  • the edge section 106 has a projection 108.
  • the projection 108 forms a latching element in the form of a bead 110.
  • the bead 110 extends along the entire circumference of the edge portion 106.
  • the bead 110 may cooperate with and engage the annular groove 94. This makes it possible to connect the sieve element 70 and the foaming element 68 together and in particular to lock together. This facilitates the assembly.
  • the frothing element 68 and the sieve element 70 can be provided separately from one another, in particular as plastic molded parts, and inserted in the interconnected state into the flow channel 18 and in particular the nozzle body 30. Contrary to the flow direction 46, they can be supported on the annular shoulder 44 and additionally fixed by the interference fit of the clamping element 86 with the wall 40.
  • a foaming space 112 is formed between the foaming section 72 and the sieve section 96, since the foaming section 72 and the sieve section 96 are spaced apart along the axis 36.
  • Transverse to the flow direction 46 of the AufMumraum 112 is a double Wall bounded, wherein the edge portion 90 of the foaming element 68 and the edge portion 106 of the screen element 70 each form a wall of the double wall.
  • the double wall formed from the edge portions 90 and 106 makes it possible to seal the foaming space 112 in the circumferential direction so that substantially no cleaning agent flows laterally past the sieve portion 96 between the sieve element 70 and the wall 40.
  • the mixture of carrier liquid (especially water), cleaning chemical and air (foamable detergent) is, as already mentioned, accelerated by the nozzle assembly 48 and relaxes in the storage space 66. It forms due to the AufMumiatas 68 upstream of the AufMumabiteses 72, a relatively large back pressure. In this case, air bubbles in the detergent can be reduced. Under the effect of the flow, the cleaning agent passes through the foaming section 72 at the through-holes 82. There are turbulences, which lead to foaming of the detergent in AufDumraum 112.
  • the cleaning agent is further foamed. Due to the smaller cross section of the passage openings 102 with respect to the passage openings 82, air bubbles present in the foam are reduced, which leads to a further foaming of the cleaning agent.
  • a dimensionally stable, solid cleaning foam with which a very good cleaning effect can be achieved.
  • the nature of the cleaning foam and its dimensional stability also make it possible, in particular, to form a flat jet with a good beam profile with the beam-shaping element 32.
  • the good beam profile favors the cleaning effect that can be achieved by the cleaning foam delivered with the foam-generating device 10.
  • the foaming section 72 has the central region 78 free of passage openings 82 and the sieve section 96 the central region 100 free of passage openings 102.
  • the cleaning agent passes through the foaming section 72 and the Siebabschnit7 96 not centrally, but radially outside
  • the projecting portion 80 and the projecting portion 103 are arranged in the AufMumraum 112 of the respective central regions 78, 100 and, consequently, on the walls 40 of the foaming section ,
  • the formation of a so-called "free jet”, substantially centered about the axis 36, can be avoided.
  • the generation of cleaning foam takes place in two stages in the foam-generating device 10, namely by the frothing element 68 and the downstream sieve element 70.
  • the dimensionally stable cleaning foam can be provided with very small bubbles without the risk of a "backflow Foam in the nozzle body 48 takes place in such a way that the foam escapes undesirably from the flow channel 18 through the inlet opening 54.

Description

Die Erfindung betrifft eine Schaumerzeugungsvorrichtung, insbesondere als Zubehör für ein Hochdruckreinigungsgerät, die einen Strömungskanal umfasst oder bildet und einen Düsenkörper mit einer Austrittsöffnung umfasst sowie ein Aufschäumelement, das einen im Strömungskanal strömungsaufwärts der Austrittsöffnung angeordneten, Durchgangsöffnungen aufweisenden Aufschäumabschnitt aufweist, wobei ein aufschäumbares Reinigungsmittel durch den Strömungskanal bis zur Austrittsöffnung strömt und bei Durchgang durch den Aufschäumabschnitt aufgeschäumt wird, wobei der Düsenkörper an der Austrittsöffnung ein Strahlformungselement umfasst zum Formen eines Flachstrahles des aufgeschäumten Reinigungsmittels, wobei die Schaumerzeugungsvorrichtung ein Siebelement umfasst, das einen im Strömungskanal angeordneten Siebabschnitt aufweist, wobei der Siebabschnitt strömungsabwärts des Aufschäumabschnittes und im Abstand zu diesem und strömungsaufwärts des Strahlformungselementes angeordnet ist und wobei der Siebabschnitt Durchgangsöffnungen aufweist, die kleiner sind als die Durchgangsöffnungen des Aufschäumabschnittes.The invention relates to a foam-generating device, in particular as an accessory for a high-pressure cleaning device, which comprises or forms a flow channel and a nozzle body having an outlet opening and a frothing element, which has a frothing section arranged in the flow channel upstream of the outlet opening, wherein a frothable detergent through the Flow channel to the outlet opening and is foamed when passing through the Aufschäumabschnitt, wherein the nozzle body at the outlet opening comprises a beam forming element for forming a flat jet of the foamed detergent, wherein the foam generating device comprises a sieve element having a sieve section arranged in the flow channel, wherein the sieve section downstream the Aufschäumabschnittes and in the distance to this and upstream of the beam-shaping elements s is arranged and wherein the screen section has through openings which are smaller than the passage openings of the foaming section.

Eine Schaumerzeugungsvorrichtung dient zum Bereitstellen eines aufgeschäumten Reinigungsmittels (Reinigungsschaum), um eine gute Reinigungswirkung zu erzielen. Die Vorrichtung kann insbesondere ein Zubehör für ein Hochdruckreinigungsgerät sein und beispielsweise mit dessen Strahlpistole oder Strahlrohr verbunden werden, so dass unter Einsatz der Schaumerzeugungsvorrichtung die Reinigungswirkung des Hochdruckreinigungsgerätes gesteigert werden kann. Das aufschäumbare Reinigungsmittel ist insbesondere ein Gemisch aus einer Trägerflüssigkeit, speziell Wasser, und einer dieser beigemischten Reinigungschemikalie. Bevorzugt handelt es sich um eine homogene Vermischung der Reinigungschemikalie und der Trägerflüssigkeit. In dem aufschäumbaren Reinigungsmittel ist zur Steigerung der Schaumwirkung ferner insbesondere Luft enthalten, welche beispielsweise strömungsaufwärts des Aufschäumelementes in den Strömungskanal eintreten und dem Gemisch zugeführt werden kann. Das Reinigungsmittel kann in der Schaumerzeugungsvorrichtung bereitgestellt oder dieser bereits in gemischter Form zugeführt werden.A foaming device serves to provide a foamed cleaning agent (cleaning foam) in order to achieve a good cleaning effect. The device may in particular be an accessory for a high-pressure cleaning device and be connected, for example, with its blasting gun or jet pipe, so that the cleaning effect of the high-pressure cleaning device can be increased by using the foam-generating device. The foamable cleaning agent is in particular a mixture of a carrier liquid, especially water, and one of these blended cleaning chemical. It is preferably a homogeneous mixing of the cleaning chemical and the carrier liquid. In addition, in order to increase the foam effect, the foamable cleaning agent additionally contains, in particular, air which, for example, flows upstream of the foam Foaming element enter the flow channel and can be supplied to the mixture. The cleaning agent may be provided in the foaming device or may already be supplied in mixed form.

Um eine gute Reinigungswirkung zu erzielen, ist es zum einen von Vorteil, wenn unter großer Aufschäumung des Reinigungsmittels ein möglichst fester Schaum mit kleinen Schaumblasen bereitgestellt wird. Zu diesem Zweck erzeugt das Aufschäumelement einen Staudruck im Strömungskanal, so dass bei Durchgang des Reinigungsmittels durch den Aufschäumabschnitt Verwirbelungen entstehen, die zur Schaumbildung führen. Zum anderen ist es von Vorteil, ein möglichst definiertes Strahlprofil zu erzeugen, weswegen bei der gattungsgemäßen Schaumerzeugungsvorrichtung der Düsenkörper mit dem Strahlformungselement versehen ist. Dadurch kann der Reinigungsschaum als Flachstrahl, der im Wesentlichen in einer Ebene angeordnet ist und sich insbesondere fächerförmig ausbreitet, ausgegeben werden.In order to achieve a good cleaning effect, it is on the one hand advantageous if, with a large foam of the cleaning agent as solid as possible foam is provided with small foam bubbles. For this purpose, the foaming element generates a dynamic pressure in the flow channel, so that upon passage of the cleaning agent through the foaming section, turbulences occur which lead to the formation of foam. On the other hand, it is advantageous to generate a beam profile as defined as possible, which is why the nozzle body is provided with the beam-shaping element in the generic foam-generating device. As a result, the cleaning foam can be dispensed as a flat jet, which is arranged substantially in one plane and in particular spreads in a fan-shaped manner.

Eine Schaumerzeugungsvorrichtung ist in der EP 1 852 190 B1 beschrieben. Als Aufschäumelement kommt beispielsweise eine Lochplatte, ein Sieb, gepresste Stahlwolle oder ein offenporiger Metallschaum zum Einsatz. Damit ein fester Reinigungsschaum entsteht, müssen die Durchgangsöffnungen oder auch Poren des Aufschäumabschnittes allerdings so klein sein, dass strömungsaufwärts des Aufschäumabschnittes ein großer Staudruck entsteht. Dies resultiert in Schaumbildung strömungsaufwärts des Aufschäumelementes, und Schaum kann unerwünschterweise seitlich aus der Schaumerzeugungsvorrichtung austreten. Die Durchgangsöffnungen müssen daher so groß sein, dass dieser seitliche Austritt von Schaum vermieden werden kann. Dies hat zur Folge, dass sich strömungsabwärts des Aufschäumabschnittes Reinigungsschaum mit verhältnismäßig großer Blasengröße formt. Dieser wenig formstabile Reinigungsschaum zerfällt schneller und weist eine geringere Reinigungswirkung auf. Zudem wird das Strahlprofil des Flachstrahles durch die größeren Luftblasen im Schaum beeinträchtigt.A foaming device is in the EP 1 852 190 B1 described. The foaming element used is, for example, a perforated plate, a sieve, pressed steel wool or an open-pored metal foam. However, in order for a solid cleaning foam to be produced, the passage openings or even pores of the foaming section must be so small that a large back pressure is created upstream of the foaming section. This results in foaming upstream of the frothing member, and foam may undesirably leak laterally from the foam generator. The passage openings must therefore be so large that this lateral leakage of foam can be avoided. As a result, cleaning foam with a relatively large bubble size is formed downstream of the foaming section. This less stable cleaning foam breaks down faster and has a lower cleaning effect. In addition, the beam profile of the flat jet is affected by the larger air bubbles in the foam.

Die US 3,388,868 beschreibt eine Schaumerzeugungsvorrichtung der eingangs genannten Art zum Versprühen von Herbiziden.The US 3,388,868 describes a foam-producing device of the type mentioned for spraying herbicides.

Eine Schaumerzeugungsvorrichtung zum Einsatz bei der Brandbekämpfung ist in der US 2,492,037 beschrieben. Schaum wird mit einem sich konisch aufweitenden Strahl abgegeben, um eine möglichst breite Verteilung zu erzielen, oder als konzentrierter, kraftvoller Punktstrahl.A foaming device for use in fire fighting is in the US 2,492,037 described. Foam is emitted with a conically widening jet in order to achieve the widest possible distribution, or as a concentrated, powerful spot beam.

Aufgabe der vorliegenden Erfindung ist es, eine gattungsgemäße Schaumerzeugungsvorrichtung bereitzustellen, mit der ein Reinigungsschaum mit besserer Reinigungswirkung erzeugt werden kann.The object of the present invention is to provide a generic foaming device with which a cleaning foam with a better cleaning effect can be produced.

Diese Aufgabe wird bei einer Schaumerzeugungsvorrichtung der eingangs genannten Art erfindungsgemäß durch die Merkmale des kennzeichnenden Teils von Anspruch 1 gelöst.This object is achieved according to the invention in a foam-producing device of the type mentioned by the features of the characterizing part of claim 1.

Bei der erfindungsgemäßen Schaumerzeugungsvorrichtung kann unter Einsatz des Aufschäumelementes im Strömungskanal ein Staudruck erzeugt werden, und bei Durchtritt durch den Aufschäumabschnitt wird das Reinigungsmittel aufgeschäumt. Bei weiterem Durchtritt des aufgeschäumten Reinigungsmittels durch den strömungsabwärts im Strömungskanal positionierten Siebabschnitt können Luftblasen im Reinigungsschaum verkleinert werden. Dies wird dadurch ermöglicht, dass die Durchgangsöffnungen des Siebabschnittes kleiner sind als diejenigen des Aufschäumabschnittes, insbesondere einen kleineren Querschnitt aufweisen als diese. Die Verkleinerung der Blasen führt zu einer Vergrößerung des Volumens und zu einer Verfestigung des Schaumes, so dass dieser strömungsabwärts des Siebabschnittes eine hohe Formstabilität aufweisen kann. Durch die hohe Formstabilität kann mit dem Strahlformungselement ein Flachstrahl mit gutem Strahlprofil erzeugt werden. Unter Einsatz der Schaumerzeugungsvorrichtung kann dadurch ein Strahl mit gutem Strahlprofil und umfassend Reinigungsschaum mit hoher Reinigungswirkung erzeugt werden. Durch Vorsehen des Siebelementes zusätzlich zum Aufschäumelement ist es anders als bei der in der EP 1 852 190 B1 beschriebenen Schaumerzeugungsvorrichtung nicht erforderlich, bereits bei Durchtritt des Reinigungsmittels allein mit dem Aufschäumelement einen formstabilen Reinigungsschaum zu erzeugen. Dies kann vielmehr in einem zweiten Schritt durch Vorhandensein des Siebelementes sichergestellt werden. Ein Aufstauen oder "Rückschlag" von festem, formstabilen Reinigungsschaum entgegen der Strömungsrichtung durch den Aufschäumabschnitt hindurch und durch gegebenenfalls strömungsaufwärts des Aufschäumabschnittes angeordnete Lufteintrittsöffnungen kann, wie sich in der Praxis zeigt, weitgehend vermieden werden.In the foam-producing device according to the invention, a dynamic pressure can be generated by using the frothing element in the flow channel, and when passing through the frothing section, the cleaning agent is foamed. Upon further passage of the foamed cleaning agent through the downstream in the flow channel positioned screen section air bubbles in the cleaning foam can be reduced. This is made possible by the passage openings of the screen section being smaller than those of the foaming section, in particular having a smaller cross section than the latter. The reduction of the bubbles leads to an increase in the volume and to a solidification of the foam, so that this can have a high dimensional stability downstream of the screen section. Due to the high dimensional stability, a flat jet with good beam profile can be generated with the beam-shaping element. By using the foam generating device, a jet having a good jet profile and cleaning foam having a high cleaning effect can thereby be produced. By providing the screen element in addition to the foaming element, it is different than in the EP 1 852 190 B1 described foam generating device it is not necessary to produce a dimensionally stable cleaning foam when the cleaning agent passes through alone with the foaming element. Rather, this can be ensured in a second step by the presence of the sieve element. A damming or "kickback" of solid, dimensionally stable cleaning foam against the flow direction through the Aufschäumabschnitt and optionally arranged upstream of the Aufschäumabschnittes air inlet openings, as can be seen in practice, largely avoided.

Als vorteilhaft erweist es sich, dass der Aufschäumabschnitt und/oder der Siebabschnitt einen zentralen öffnungsfreien Bereich aufweisen, der frei von Durchgangsöffnungen ist und der von Durchgangsöffnungen umgeben ist. "Zentral" bezieht sich vorliegend auf eine Anordnung des öffnungsfreien Bereiches in der Mitte oder im Wesentlichen in der Mitte des Strömungskanals. Durch den zentralen öffnungsfreien Bereich verlagert sich der Durchgang des Reinigungsmittels und des Schaumes durch den Aufschäumabschnitt und/oder den Siebabschnitt in Richtung einer Wand des Strömungskanals. Die Menge an zentral durch den Strömungskanal strömenden Reinigungsmittel und Schaum wird dadurch verringert. Dies erweist sich als vorteilhaft für die Formung des Flachstrahls durch das Strahlformungselement. Im Ergebnis kann dadurch ein besseres Stahlprofil bereitgestellt werden.It proves to be advantageous for the foaming section and / or the sieve section to have a central, opening-free region which is free of passage openings and which is surrounded by passage openings. In this case, "central" refers to an arrangement of the opening-free region in the middle or essentially in the middle of the flow channel. Through the central opening-free region, the passage of the cleaning agent and of the foam through the foaming section and / or the sieve section is displaced in the direction of a wall of the flow channel. The amount of centrally flowing through the flow channel detergent and foam is thereby reduced. This proves to be advantageous for the shaping of the flat jet by the beam-shaping element. As a result, a better steel profile can be provided thereby.

Der öffnungsfreie Bereich am Aufschäumabschnitt beträgt beispielsweise ungefähr 30% von dessen Durchmesser und am Siebabschnitt ungefähr 5% bis 15% von dessen Durchmesser, jeweils bezogen auf eine kreisförmige Ausgestaltung des Aufschäumabschnittes beziehungsweise des Siebabschnittes.The opening-free region at the foaming section is, for example, approximately 30% of its diameter and approximately 5% to 15% of its diameter on the wire section, in each case based on a circular configuration of the foaming section or the sieve section.

Bei einer vorteilhaften Ausführungsform der Schaumerzeugungsvorrichtung zeigt sich in der Praxis, dass der mittlere Abstand des Siebabschnittes vom Aufschäumabschnitt ungefähr 15% bis 35% des Durchmessers des Siebabschnittes beträgt, bezogen auf eine kreisförmige Ausgestaltung des Siebabschnittes. Beispielsweise beträgt der mittlere Abstand ungefähr 25% des Durchmessers des Siebabschnittes.In an advantageous embodiment of the foam-producing device, in practice, the mean distance of the wire section from the foaming section is approximately 15% to 35% of the diameter of the wire section, based on a circular configuration of the wire section. For example, the average distance is about 25% of the diameter of the wire section.

Bei einer weiteren bevorzugten Ausführungsform der Schaumerzeugungsvorrichtung ist es günstig, wenn der Querschnitt der Durchgangsöffnungen des Aufschäumabschnittes ungefähr viermal bis achtmal so groß ist wie der Querschnitt der Durchgangsöffnungen des Siebabschnittes, vorzugsweise ungefähr fünf- bis sechsmal so groß.In a further preferred embodiment of the foam-generating device, it is favorable if the cross-section of the through-openings of the foaming-up section is approximately four times to eight times as large as the cross-section the passage openings of the wire section, preferably about five to six times as large.

Bei einer konkreten Umsetzung der Schaumerzeugungsvorrichtung, speziell als Zubehör für ein Hochdruckreinigungsgerät, erweist es sich in der Praxis als günstig, wenn der Durchmesser der Durchgangsöffnungen des Aufschäumabschnittes ungefähr 1 Millimeter bis 1,5 Millimeter beträgt, beispielsweise 1,2 Millimeter. Der Durchmesser der Durchgangsöffnungen des Siebabschnittes kann beispielsweise ungefähr 0,3 bis 0,7 Millimeter betragen, beispielsweise 0,5 Millimeter.In a concrete implementation of the foam-generating device, especially as an accessory for a high-pressure cleaner, it proves in practice to be beneficial if the diameter of the through holes of the Aufschäumabschnittes about 1 millimeter to 1.5 millimeters, for example, 1.2 millimeters. The diameter of the passage openings of the screen section may be, for example, about 0.3 to 0.7 millimeters, for example 0.5 millimeters.

Bei einer vorteilhaften Ausführungsform der Schaumerzeugungsvorrichtung erweist es sich als günstig, wenn die Anzahl der Durchgangsöffnungen des Siebabschnittes ungefähr fünfmal bis zehnmal so hoch ist wie die Anzahl der Durchgangsöffnungen des Aufschäumabschnittes.In an advantageous embodiment of the foam-generating device, it proves to be advantageous if the number of through holes of the wire section is about five times to ten times as high as the number of through holes of the foaming section.

Die Durchgangsöffnungen des Aufschäum- und/oder des Siebabschnittes können rund und/oder parallel zueinander ausgerichtet sein. Beispielsweise sind die Durchgangsöffnungen des Aufschäum- und/oder des Siebabschnittes axial ausgerichtet, längs oder parallel zu einer von der Schaumerzeugungsvorrichtung definierten Achse, entlang derer der Strömungskanal verläuft.The passage openings of the foaming and / or the screen section can be aligned around and / or parallel to each other. For example, the passage openings of the foaming and / or the Siebabschnittes are axially aligned, along or parallel to an axis defined by the foam generating device, along which the flow channel extends.

Bei einer konstruktiv einfachen Ausgestaltung der Schaumerzeugungsvorrichtung ist es günstig, wenn der Aufschäumabschnitt und/oder der Siebabschnitt als Lochplatten ausgestaltet sind.In a structurally simple embodiment of the foam generating device, it is advantageous if the foaming section and / or the wire section are designed as perforated plates.

Zwischen dem Aufschäumabschnitt und dem Siebabschnitt ist vorzugsweise ein Aufschäumraum für das Reinigungsmittel gebildet, in dem das den Aufschäumabschnitt durchtretende Reinigungsmittel aufgeschäumt werden kann.Between the foaming section and the screen section, a foaming space for the cleaning agent is preferably formed, in which the cleaning agent passing through the foaming section can be foamed.

Von Vorteil ist es, wenn mindestens eine Wand vorgesehen ist, die den Aufschäumraum quer zur Strömungsrichtung des Reinigungsmittels begrenzt. Darunter kann vorliegend insbesondere verstanden werden, dass der Aufschäumraum längs des Strömungskanals vom Aufschäumabschnitt und vom Siebabschnitt und in Umfangsrichtung von der mindestens einen Wand begrenzt ist. Aufgrund der Begrenzung durch die mindestens eine Wand kann vermieden werden, dass Schaum unter Umgehung des Siebabschnittes aus dem Aufschäumraum austritt. Stattdessen kann der Schaum bestimmungsgemäß durch den Siebabschnitt hindurchtreten.It is advantageous if at least one wall is provided which limits the foaming space transversely to the flow direction of the cleaning agent. In the present case, this can be understood in particular to mean that the foaming space is delimited along the flow channel of the foaming section and the screen section and in the circumferential direction of the at least one wall. Due to the limitation by the at least one wall, it can be avoided that foam escapes from the foaming space, bypassing the sieve section. Instead, the foam is allowed to pass through the wire section as intended.

Vorteilhafterweise umfassen oder bilden das Aufschäumelement und/oder das Siebelement die mindestens eine Wand. Dadurch kann zum Beispiel eine konstruktiv einfache Ausgestaltung erzielt werden.Advantageously, the foaming element and / or the sieve element comprise or form the at least one wall. As a result, for example, a structurally simple embodiment can be achieved.

Günstig ist es, wenn das Aufschäumelement oder das Siebelement ineinander greifen und jeweils eine Wand umfassen oder bilden, wobei die Wände in Umfangsrichtung des Aufschäumraumes aneinander anliegen. Der Aufschäumraum kann dadurch mit einer doppelwandigen Wand begrenzt werden. Dadurch kann der Aufschäumraum quer zur Strömungsrichtung zuverlässig abgedichtet werden. Dadurch kann weitgehend vermieden werden, dass Schaum unerwünschterweise unter Umgehung des Siebabschnittes aus dem Aufschäumraum austritt.It is advantageous if the foaming element or the sieve element interlock and each comprise or form a wall, the walls abutting one another in the circumferential direction of the foaming space. The Aufschäumraum can be limited by a double-walled. As a result, the foaming space can be reliably sealed transversely to the direction of flow. As a result, it can largely be avoided that foam undesirably escapes from the foaming chamber, bypassing the sieve section.

Günstig ist es, wenn der Aufschäumabschnitt einen in Richtung des Siebabschnittes hervorspringenden zentralen Vorsprungsbereich aufweist und/oder wenn der Siebabschnitt einen in Richtung des Aufschäumabschnittes hervorspringenden zentralen Vorsprungsbereich aufweist. Der Vorsprungsbereich ermöglicht es ähnlich wie der öffnungsfreie Bereich, dass der Durchgang von Reinigungsmittel und Schaum durch den Aufschäumabschnitt und den Siebabschnitt in Richtung einer Wand des Strömungskanals verlagert wird. Dies weist sich als günstig für die Formung des Flachstrahls mit dem Strahlformungselement auf. Der jeweilige Vorsprungsbereich kann beispielsweise stiftförmig, zapfenförmig oder sockelförmig sein.It is favorable if the foaming section has a central projecting area projecting in the direction of the screen section and / or if the screen section has a central projecting area projecting in the direction of the foaming section. The protrusion area, similar to the opening-free area, allows the passage of detergent and foam through the frothing section and the screen section to be displaced toward a wall of the flow channel. This is advantageous for the formation of the flat jet with the beam-shaping element. The respective projecting area can be, for example, in the form of a pin, a cone or a socket.

Der Aufschäumabschnitt und/oder der Siebabschnitt können eine Wölbung oder Krümmung in Strömungsrichtung des Reinigungsmittels aufweisen. Dadurch wird vorliegend insbesondere verstanden, dass ein zentraler Bereich des Aufschäumabschnittes und/oder des Siebabschnittes weiter strömungsabwärts gelegen ist als ein jeweiliger Randbereich, der einer Wandung des Strömungskanals zugewandt ist. Die Wölbung oder Krümmung ist beispielsweise kalottenförmig, insbesondere kugelkalottenförmig, oder kegelmantelförmig.The foaming section and / or the screen section may have a curvature or curvature in the direction of flow of the cleaning agent. In the present case, this means in particular that a central region of the Foaming section and / or the Siebabschnittes downstream located as a respective edge region which faces a wall of the flow channel. The curvature or curvature is, for example, dome-shaped, in particular spherical cap-shaped, or cone-shaped.

Vorzugsweise verjüngt sich der Querschnitt des Strömungskanals strömungsabwärts des Siebabschnittes in Richtung des Strahlformungselementes kontinuierlich. Dies erweist sich als günstig, um mit dem Strahlformungselement einen Flachstrahl mit gutem Profil zu formen.Preferably, the cross-section of the flow channel downstream of the wire section continuously tapers in the direction of the beam-shaping element. This proves to be favorable in order to form a flat beam with a good profile with the beam-shaping element.

Bevorzugt sind das Aufschäumelement und das Siebelement getrennt voneinander gebildet und miteinander verbunden. Dies erleichtert zum einen die Montage der Schaumerzeugungsvorrichtung. Das Aufschäumelement und das Siebelement können beispielsweise miteinander verbunden als vormontierte Baueinheit bereitgestellt und in den Strömungskanal eingesetzt werden. Zum anderen kann eine Relativbewegung des Aufschäum- und des Siebelementes vermieden und deren Relativposition bei Anordnung im Strömungskanal dadurch beibehalten werden. Dies ist vorteilhaft für die Bereitstellung eines Schaumes von zeitlich unveränderter Qualität.The foaming element and the sieve element are preferably formed separately from one another and connected to one another. This facilitates on the one hand the mounting of the foam generating device. The foaming element and the sieve element can be provided, for example, connected together as a preassembled structural unit and inserted into the flow channel. On the other hand, a relative movement of the foaming and the sieve element can be avoided and their relative position can be maintained by arrangement in the flow channel. This is advantageous for providing a foam of timeless quality.

Das Aufschäumelement und das Siebelement sind zum Beispiel durch Verrastung miteinander verbunden, wobei ergänzend oder alternativ auch eine Verklemmung möglich ist.The foaming element and the sieve element are connected to one another, for example, by latching, wherein additionally or alternatively, jamming is also possible.

Zur Verrastung weisen das Aufschäum- und das Siebelement zusammenwirkende Rastelemente auf, die eine Rasteinrichtung bilden. Beispielsweise ist mindestens ein Rastvorsprung vorgesehen, der in eine korrespondierende Rastaufnahme eingreift. Der Rastvorsprung ist zum Beispiel ein Wulst, der in eine korrespondierende Aufnahme in Form einer Nut eingreift.For latching, the foaming and the sieve element have cooperating latching elements which form a latching device. For example, at least one latching projection is provided, which engages in a corresponding latching receptacle. The latching projection is for example a bead which engages in a corresponding receptacle in the form of a groove.

Von Vorteil ist es, wenn das Aufschäumelement und das Siebelement jeweils einen einer Wandung des Strömungskanals zugewandten Rand aufweisen und wenn das Aufschäumelement und das Siebelement an den Rändern, vorzugsweise entlang der gesamten Ränder, miteinander verbunden sind. Die Verbindung am Rand, bevorzugt entlang des gesamten Randes und vorzugsweise unmittelbar der Wandung des Strömungskanals benachbart, erlaubt es, den vom Reinigungsmittel passierbaren freien Querschnitt des Aufschäumelementes und des Siebelementes möglichst groß auszugestalten.It is advantageous if the foaming element and the sieve element each have a wall facing the wall of the flow channel edge and if the foaming element and the sieve element at the edges, preferably along the entire edges, are interconnected. The connection at the edge, preferably along the entire edge and preferably immediately adjacent to the wall of the flow channel, makes it possible to design the passable from the detergent free cross section of the foaming element and the screen element as large as possible.

Das Aufschäumelement und das Siebelement können jeweils getrennt vom Strömungskanal gebildet und in diesen eingesetzt sein. Beispielsweise sind das Aufschäumelement und/oder das Siebelement in den Strömungskanal eingesetzte Einsetzelemente, die sich an einem Anschlag am Strömungskanal entgegen der Strömungsrichtung des Reinigungsmittels abstützen. Der Anschlag ist beispielsweise eine Schulter, insbesondere eine Ringschulter, an einer Wandung des Strömungskanals, an dem das Siebelement und/oder das Aufschäumelement anliegen können.The foaming element and the sieve element can each be formed separately from the flow channel and inserted into it. For example, the foaming element and / or the sieve element inserted into the flow channel insertion elements, which are supported against a stop on the flow channel against the flow direction of the cleaning agent. The stop is for example a shoulder, in particular an annular shoulder, on a wall of the flow channel, on which the sieve element and / or the foaming element can rest.

Vorteilhafterweise ist am Aufschäumelement und/oder am Siebelement mindestens ein Klemmelement angeordnet zum Verklemmen mit einer Wandung des Strömungskanals. Dadurch kann insbesondere verstanden werden, dass das Aufschäumelement und/oder das Siebelement klemmend im Strömungskanal gehalten sein können (auch im miteinander verbundenen Zustand). Über das Klemmelement kann insbesondere ein Presssitz für das Aufschäumelement und/oder das Siebelement sichergestellt und dadurch ein zuverlässiger Sitz und eine definierte Relativposition zum Strömungskanal auch bei schwankenden Fluiddrücken sichergestellt werden.Advantageously, at least one clamping element is arranged on the foaming element and / or on the screen element for clamping with a wall of the flow channel. In this way, it can be understood in particular that the foaming element and / or the sieve element can be clamped in the flow channel (also in the connected state). In particular, an interference fit for the frothing element and / or the sieve element can be ensured via the clamping element, thereby ensuring a reliable seat and a defined relative position to the flow channel even with fluctuating fluid pressures.

Beispielsweise sind das Aufschäum- und/oder das Siebelement im Düsenkörper klemmend gehalten, der einen Abschnitt des Strömungskanals bilden kann.For example, the foaming and / or the sieve element are clamped in the nozzle body, which can form a portion of the flow channel.

Das mindestens eine Klemmelement ist vorzugsweise entlang eines gesamten der Wandung des Strömungskanals zugewandten Randes des Aufschäumelementes und/oder des Siebelementes angeordnet und mit der Wandung verklemmt. Dies ermöglicht zum einen eine zuverlässige Halterung des Aufschäumelementes und/oder des Siebelementes. Zum anderen kann das mindestens eine Klemmelement ein Dichtelement ausbilden. Dadurch kann vermieden werden, dass Reinigungsmittel oder Schaum seitlich am Aufschäumabschnitt und/oder am Siebabschnitt vorbei durch den Strömungskanal strömt.The at least one clamping element is preferably arranged along an entire wall of the flow channel facing the edge of the foaming element and / or the screen element and clamped to the wall. This allows for a reliable mounting of the foaming element and / or the sieve element. On the other hand, the at least one clamping element can form a sealing element. As a result, it can be avoided that cleaning agent or foam flows laterally past the foaming section and / or on the screen section through the flow channel.

Vorteilhafterweise ist das Aufschäumelement und/oder das Siebelement einstückig ausgestaltet, insbesondere als Kunststoffformteil. Dies ermöglicht eine kostengünstige und konstruktiv einfache Herstellung des Aufschäum- und/oder des Siebelementes.Advantageously, the foaming element and / or the sieve element is designed in one piece, in particular as a plastic molded part. This allows a cost-effective and structurally simple production of the foaming and / or the sieve element.

Die Schaumerzeugungsvorrichtung definiert günstigerweise eine Achse, um die der Düsenkörper drehbar ist. Dadurch kann die Ebene des Flachstrahls gedreht werden, wodurch die Schaumerzeugungsvorrichtung vielseitiger einsetzbar ist.The foam generating device conveniently defines an axis about which the nozzle body is rotatable. Thereby, the plane of the flat jet can be rotated, whereby the foam generating device is more versatile.

Das Aufschäumelement und das Siebelement sind bevorzugt drehfest am Düsenkörper gehalten, so dass sie bei dessen Drehung zusammen mit diesem gedreht werden können.The foaming element and the sieve element are preferably held against rotation on the nozzle body so that they can be rotated together with the latter during its rotation.

Von Vorteil ist es, wenn am Strömungskanal strömungsaufwärts des Aufschäumelementes mindestens eine Eintrittsöffnung für Luft gebildet ist, die dem Reinigungsmittel beimischbar ist.It is advantageous if at least one inlet opening for air, which is admixable with the cleaning agent, is formed on the flow channel upstream of the foaming element.

Günstigerweise umfasst der Strömungskanal strömungsaufwärts des Aufschäumelementes eine Düsenanordnung, mit der das Reinigungsmittel im Strömungskanal beschleunigbar ist und die dem Aufschäumelement unmittelbar vorgelagert einen Stauraum bildet, wobei sich der Strömungskanal im Stauraum in Richtung auf das Aufschäumelement kontinuierlich erweitert. Die Düsenanordnung weist beispielsweise einen sich verjüngenden Abschnitt auf, in dem das Reinigungsmittel beschleunigt wird. An den Abschnitt kann sich der Stauraum anschließen, der sich in Richtung auf das unmittelbar strömungsabwärts folgende Aufschäumelement kontinuierlich erweitert. Durch die Beschleunigung trifft das Reinigungsmittel mit hohem Druck auf das Aufschäumelement, wobei durch die Erweiterung eine verhältnismäßig große Fläche des Aufschäumelementes mit zur Aufschäumung beaufschlagt werden kann.The flow channel upstream of the frothing element expediently comprises a nozzle arrangement with which the cleaning agent in the flow channel can be accelerated and forms a storage space immediately upstream of the frothing element, the flow channel continuously expanding in the stowage space in the direction of the frothing element. For example, the nozzle assembly has a tapered portion in which the cleaning agent is accelerated. The storage space, which widens continuously in the direction of the immediately following downstream expansion element, can adjoin the section. As a result of the acceleration, the cleaning agent strikes the frothing element at high pressure, wherein a relatively large area of the foaming element can be acted upon with foaming by the extension.

Die Düsenanordnung ist bevorzugt strömungsabwärts eines Injektors der Schaumerzeugungsvorrichtung angeordnet, mit dem eine Reinigungschemikalie der Trägerflüssigkeit beigemischt werden kann.The nozzle arrangement is preferably arranged downstream of an injector of the foam-generating device, with which a cleaning chemical of the carrier liquid can be added.

Die Schaumerzeugungsvorrichtung kann eine Anschlusseinrichtung umfassen zum Anschließen eines Reinigungsmittelbehälters und eine Beimischeinrichtung, über die eine Reinigungschemikalie aus dem Reinigungsmittelbehälter ansaugbar und eine Trägerflüssigkeit im Strömungskanal beimischbar ist. Günstigerweise ist ein Einstellelement vorgesehen, mit dem die Menge an beigemischter Reinigungschemikalie eingestellt werden kann. Als Trägerflüssigkeit kommt, wie bereits erwähnt, vorliegend insbesondere Wasser zum Einsatz. Die Beimischeinrichtung ermöglicht vorzugsweise eine homogene Vermischung der Trägerflüssigkeit und der Reinigungschemikalie. Strömungsabwärts der Beimischeinrichtung kann die vorstehend erwähnte Düsenanordnung am Strömungskanal angeordnet sein oder einen Teil desselben bilden. Weiter kann strömungsabwärts der Beimischeinrichtung mindestens eine Eintrittsöffnung für Luft zum Beimischen in das Reinigungsmittel am Strömungskanal gebildet sein.The foam generating device may comprise a connection device for connecting a detergent container and an admixing device, via which a cleaning chemical from the detergent container can be sucked in and a carrier liquid can be mixed in the flow channel. Conveniently, an adjustment is provided, with which the amount of blended cleaning chemical can be adjusted. As already mentioned, in particular water is used as the carrier liquid. The admixing device preferably allows homogeneous mixing of the carrier liquid and the cleaning chemical. Downstream of the mixing device, the above-mentioned nozzle arrangement may be arranged on the flow channel or form part of it. Furthermore, downstream of the mixing device, at least one inlet opening for air can be formed for mixing into the cleaning agent at the flow channel.

Die Beimischeinrichtung umfasst vorzugsweise einen Venturi-Injektor.The admixing device preferably comprises a venturi injector.

Günstigerweise umfasst die Schaumerzeugungsvorrichtung eine Verbindungseinrichtung zum Verbinden mit einer Hochdruckpistole oder einem Strahlrohr eines Hochdruckreinigungsgerätes.Conveniently, the foam generating device comprises a connecting device for connecting to a high-pressure gun or a jet pipe of a high-pressure cleaning device.

Die nachfolgende Beschreibung einer bevorzugten Ausführungsform der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung der Erfindung. Es zeigen:

Figur 1:
eine perspektivische Darstellung einer erfindungsgemäßen Schaumerzeugungsvorrichtung und eines an diese angeschlossenen Reinigungsmittelbehälters;
Figur 2:
eine Längsschnittansicht (Teildarstellung) der Reinigungsvorrichtung aus Figur 1 längs der Linie 2-2 in Figur 1;
Figur 3:
eine vergrößerte Darstellung eines Ausschnittes von Figur 2;
Figur 4:
eine vergrößerte Darstellung von Detail A in Figur 3;
Figur 5:
eine erste perspektivische Explosionsdarstellung eines Aufschäumelementes und eines Siebelementes der Schaumerzeugungsvorrichtung aus Figur 1 und
Figur 6:
eine zweite perspektivische Darstellung des Aufschäumelementes und des Siebelementes.
The following description of a preferred embodiment of the invention serves in conjunction with the drawings, the detailed explanation of the invention. Show it:
FIG. 1:
a perspective view of a foam generating device according to the invention and a connected to this detergent container;
FIG. 2:
a longitudinal sectional view (partial view) of the cleaning device FIG. 1 along the line 2-2 in FIG. 1 ;
FIG. 3:
an enlarged view of a section of FIG. 2 ;
FIG. 4:
an enlarged view of detail A in FIG FIG. 3 ;
FIG. 5:
a first exploded perspective view of a foaming element and a screening element of the foam-generating device FIG. 1 and
FIG. 6:
a second perspective view of the foaming element and the screen element.

Figur 1 zeigt in perspektivischer Darstellung eine bevorzugte Ausführungsform einer insgesamt mit dem Bezugszeichen 10 belegten Schaumerzeugungsvorrichtung und einen an diese angeschlossenen Reinigungsmittelbehälter 12. Die Schaumerzeugungsvorrichtung 10 weist einen Grundkörper 14 auf, ausgebildet als Strahlrohr 16. Im Strahlrohr 16 ist ein Strömungskanal 18 gebildet, durch den ein Fluid strömen kann. FIG. 1 shows a perspective view of a preferred embodiment of a total occupied by the reference numeral 10 foam generating device and connected to this detergent container 12. The foam generating device 10 has a base 14, formed as a jet pipe 16. In the jet pipe 16, a flow channel 18 is formed, through which a fluid can flow.

An einem ersten Ende der Schaumerzeugungsvorrichtung 10 ist am Grundkörper 14 eine Verbindungseinrichtung 20 angeordnet. Über die Verbindungseinrichtung kann die Schaumerzeugungsvorrichtung 10 an ein in der Zeichnung nicht dargestelltes Hochdruckreinigungsgerät angeschlossen werden, als dessen Zubehör sie eingesetzt werden kann. Beispielsweise wird die Schaumerzeugungsvorrichtung 10 an eine Strahlpistole oder an ein Strahlrohr des Hochdruckreinigungsgerätes angeschlossen. Vom Hochdruckreinigungsgerät kann der Schaumerzeugungsvorrichtung 10 eine reinigende Trägerflüssigkeit bereitgestellt werden, vorliegend insbesondere Wasser.At a first end of the foam-generating device 10, a connecting device 20 is arranged on the base body 14. About the connecting device, the foam-generating device 10 can be connected to a not shown in the drawing high-pressure cleaning device, as the accessories it can be used. For example, the foam-generating device 10 is connected to a blasting gun or to a jet pipe of the high-pressure cleaning device. From the high pressure cleaning device can the foam-generating device 10, a cleaning carrier liquid are provided, in this case in particular water.

Die Schaumerzeugungsvorrichtung 10 weist eine Beimischeinrichtung 22 auf, über die der Trägerflüssigkeit eine Reinigungschemikalie aus dem Reinigungsmittelbehälter 12 beigemischt werden kann. Die Beimischeinrichtung 22 umfasst einen an sich bekannten und in der Zeichnung nicht im Einzelnen dargestellten Venturi-Injektor 24, der im Strömungskanal 18 angeordnet ist. Über den Venturi-Injektor 24 kann die Reinigungschemikalie mittels einer vorliegend schlauchförmigen Saugleitung 26 aus dem Reinigungsmittelbehälter 12 angesaugt und der Trägerflüssigkeit beigemischt werden. Das Gemisch wird nachfolgend als Reinigungsmittel bezeichnet und ist bevorzugt homogen.The foam-generating device 10 has an admixing device 22, via which a cleaning chemical from the detergent container 12 can be added to the carrier liquid. The mixing device 22 comprises a known per se and not shown in detail in the drawing Venturi injector 24 which is arranged in the flow channel 18. About the venturi injector 24, the cleaning chemical can be sucked by means of a present tubular suction line 26 from the detergent container 12 and mixed with the carrier liquid. The mixture is referred to below as a cleaning agent and is preferably homogeneous.

Die Schaumerzeugungsvorrichtung 10 weist eine Anschlusseinrichtung 28 auf, die vorliegend an das Strahlrohr 16 angeformt ist. An die Anschlusseinrichtung 28 kann der Reinigungsmittelbehälter 12 lösbar angeschlossen werden, insbesondere manuell und werkzeuglos.The foam-generating device 10 has a connection device 28, which in the present case is integrally formed on the jet pipe 16. To the connection device 28, the detergent container 12 can be detachably connected, in particular manually and without tools.

Strömungsabwärts der Beimischeinrichtung 22 umfasst die Schaumerzeugungsvorrichtung 10 einen Düsenkörper 30. Der Düsenkörper 30 umgibt das Strahlrohr 16 an seiner der Beimischeinrichtung 22 zugewandten Seite. Ferner bildet der Düsenkörper 30 ein der Verbindungseinrichtung 20 gegenüberliegendes Ende der Schaumerzeugungsvorrichtung 10. Endseitig umfasst der Düsenkörper 30 ein Strahlformungselement 32, das eine Austrittsöffnung 34 bildet. Das Strahlformungselement 32 ist so geformt, dass die Austrittsöffnung 34 eine in Draufsicht ungefähr linsenförmige Form aufweist. Dementsprechend ist das Strahlformungselement 32 ungefähr mit der Form geöffneter Lippen versehen. Durch das Strahlformungselement 32 kann vom Düsenkörper 30 ein Flachstrahl des Reinigungsmittels ausgegeben werden, bei dem das Reinigungsmittel im Wesentlichen in einer Ebene angeordnet ist und sich insbesondere fächerförmig ausbreitet. Zuvor wird das Reinigungsmittel auf nachfolgend noch erläuterte Weise im Strömungskanal 18 aufgeschäumt.Downstream of the mixing device 22, the foam-generating device 10 comprises a nozzle body 30. The nozzle body 30 surrounds the jet pipe 16 on its side facing the mixing device 22. Furthermore, the nozzle body 30 forms an end of the foam-generating device 10 opposite the connecting device 20. At the end, the nozzle body 30 comprises a beam-shaping element 32, which forms an outlet opening 34. The beam-shaping element 32 is shaped so that the outlet opening 34 has an approximately lenticular shape in plan view. Accordingly, the beam-shaping element 32 is approximately provided with the shape of opened lips. By means of the beam-shaping element 32, a flat jet of the cleaning agent can be dispensed from the nozzle body 30, in which case the cleaning agent is arranged essentially in one plane and spreads in a fan-shaped manner in particular. Beforehand, the cleaning agent is foamed in the flow channel 18 in a manner which will be explained below.

Die Schaumerzeugungsvorrichtung 10 definiert eine Achse 36, längs derer der Strömungskanal 18 verläuft. Der Düsenkörper 30 ist am Strahlrohr 16 um die Achse 36 drehbar gehalten. Dadurch kann die Ebene des Flachstrahls gedreht werden.The foam generator 10 defines an axis 36 along which the flow channel 18 extends. The nozzle body 30 is rotatably supported on the jet pipe 16 about the axis 36. As a result, the plane of the flat jet can be rotated.

Dem Strahlformungselement 32 vorgelagert bildet der Düsenkörper 30 einen Abschnitt 38 des Strömungskanals 18. Der Abschnitt 38 umfasst eine Wand des Strömungskanals 18, und zwar mit einer Wandung 40. Dem Strahlformungselement 32 etwas strömungsaufwärts vorgelagert bildet die Wandung 40 einen Anschlag 42, der entgegen der Strömungsrichtung des Reinigungsmittels durch den Strömungskanal 18 wirkt. Der Anschlag 42 ist ausgestaltet als Ringschulter 44 in Umfangsrichtung der Achse 36.Preceding the beam-shaping element 32, the nozzle body 30 forms a section 38 of the flow channel 18. The section 38 comprises a wall of the flow channel 18, with a wall 40. The beam shaping element 32 upstream upstream forms the wall 40 a stop 42 which is opposite to the flow direction of the cleaning agent through the flow channel 18 acts. The stop 42 is configured as an annular shoulder 44 in the circumferential direction of the axis 36.

Die Strömungsrichtung des Reinigungsmittels ist durch einen Pfeil 46 in der Zeichnung symbolisiert.The flow direction of the cleaning agent is symbolized by an arrow 46 in the drawing.

Der Strömungskanal 18 wird außer vom Strahlrohr 16 und vom Düsenkörper 30 von einer Düsenanordnung 48 gebildet. Die Düsenanordnung 48 ist an der dem Abschnitt 38 zugewandten Seite auf das Strahlrohr 16 aufgesetzt und fluiddicht an dieses angeschlossen. Die Düsenanordnung 48 ist seinerseits außenseitig vom Düsenköper 30 umgeben, wobei zwischen dem Düsenkörper 30 und der Düsenanordnung 48 ein Zwischenraum 50 gebildet ist.The flow channel 18 is formed by a nozzle arrangement 48 except for the jet pipe 16 and the nozzle body 30. The nozzle assembly 48 is placed on the side facing the portion 38 on the jet pipe 16 and fluid-tightly connected thereto. The nozzle arrangement 48 in turn is surrounded on the outside by the nozzle body 30, wherein a gap 50 is formed between the nozzle body 30 and the nozzle arrangement 48.

Nahe einem Endabschnitt 52 des Strahlrohrs 16 ist in der Düsenanordnung 48 mindestens eine Eintrittsöffnung 54 gebildet, durch die hindurch Luft aus dem Zwischenraum 50 in den Strömungskanal 18 eintreten und dem Reinigungsmittel beigemischt werden kann. Figur 2 zeigt zwei anhand gestrichelter Linien dargestellte Eintrittsöffnungen 54. Zwischen einer Außenwand 56 des Düsenkörpers im Bereich des Abschnittes 38 und der Wandung 40 sind Eintrittsöffnungen 58 am Düsenkörper 30 gebildet (in Figur 2 anhand gestrichelter Linien dargestellt). Durch die Eintrittsöffnungen 58 hindurch kann Luft dem Zwischenraum 50 und über diesen dem Strömungskanal 18 zugeführt werden. Zum Ansaugen der Luft ist es von Vorteil, dass sich der Strömungskanal 18 dem Endabschnitt 52 vorgelagert verjüngt. Dadurch kann ein definierter Punktstrahl des Reinigungsmittels erzeugt werden, welcher beim Eintritt in die Düsenanordnung 48 die Luftansaugung bewirkt.Near an end portion 52 of the jet pipe 16 at least one inlet opening 54 is formed in the nozzle assembly 48 through which air from the gap 50 can enter the flow channel 18 and can be added to the cleaning agent. FIG. 2 shows two illustrated by dashed lines inlet openings 54. Between an outer wall 56 of the nozzle body in the region of the section 38 and the wall 40 inlet openings 58 on the nozzle body 30 are formed (in FIG. 2 shown by dashed lines). Through the inlet openings 58, air can be supplied to the intermediate space 50 and via this to the flow channel 18. For sucking in the air, it is advantageous that the flow channel 18 tapers upstream of the end section 52. As a result, a defined point jet of the cleaning agent can be generated, which causes the air intake on entering the nozzle arrangement 48.

Die Düsenanordnung 48 umfasst dem Endabschnitt 52 in Strömungsrichtung 46 nachgeordnet einen sich verjüngenden Abschnitt 60 und einen sich daran anschließendem Abschnitt 62 konstanten Querschnittes. Im Abschnitt 62 ist der Querschnitt der Düsenanordnung 48 minimal. An den Abschnitt 62 schließt sich in Strömungsrichtung 46 ein sich erweiternder Abschnitt 64 an. Der Abschnitt 64 erweitert sich in Strömungsrichtung 46 kontinuierlich und fasst einen nachfolgend als Stauraum 66 bezeichneten Abschnitt des Strömungskanals 18 ein.The nozzle assembly 48 includes the end portion 52 in the flow direction 46 downstream of a tapered portion 60 and a subsequent section 62 of constant cross-section. In section 62, the cross section of the nozzle assembly 48 is minimal. The section 62 is followed by an expanding section 64 in the flow direction 46. The section 64 expands continuously in the flow direction 46 and encloses a section of the flow channel 18 designated below as a storage space 66.

Das Reinigungsmittel wird durch die Düsenanordnung 48 hindurch beschleunigt und entspannt sich im Stauraum 66, wobei es unter Druckerhöhung auf ein Aufschäumelement 68 trifft, das im Strömungskanal 18 angeordnet ist. Dem Aufschäumelement 68 in Strömungsrichtung 46 nachgeordnet ist ein Siebelement 70, das ebenfalls im Strömungskanal 18 angeordnet ist.The cleaning agent is accelerated through the nozzle assembly 48 and relaxes in the storage space 66, wherein it encounters an increase in pressure on a Aufschäumelement 68, which is arranged in the flow channel 18. Downstream of the frothing element 68 in the flow direction 46 is a screen element 70, which is likewise arranged in the flow channel 18.

Auf die Ausgestaltung des Aufschäumelementes 68 und des Siebelementes 70, die beide einstückig und vorzugsweise aus einem Kunststoffmaterial gefertigt sind, wird nachfolgend insbesondere unter Verweis auf die Figuren 3 bis 6 eingegangen.On the configuration of the foaming element 68 and the screen element 70, which are both made in one piece and preferably made of a plastic material is below in particular with reference to the FIGS. 3 to 6 received.

Das Aufschäumelement 68 weist einen quer zur Strömungsrichtung 46 im Strömungskanal 18 angeordneten Aufschäumabschnitt 72 auf, der ausgestaltet ist als Lochplatte 74. Die Lochplatte 74 weist außenseitig einen Rand 76 auf, der der Wandung 40 zugewandt ist.The frothing element 68 has a frothing section 72, which is arranged transversely to the flow direction 46 in the flow channel 18 and is configured as a perforated plate 74. The perforated plate 74 has on the outside an edge 76 which faces the wall 40.

Die Lochplatte 74 weist in Strömungsrichtung 46 eine Wölbung auf, im Wesentlichen von der Gestalt eines Abschnitts einer Kugelkalotte. An einem Zentralbereich 78 ist der Aufschäumabschnitt 72 weiter strömungsabwärts angeordnet als am Rand des Aufschäumabschnitts 72. Der Zentralbereich 78 umfasst ungefähr 30% des Durchmessers des runden Aufschäumabschnittes 72.The perforated plate 74 has a curvature in the flow direction 46, essentially the shape of a section of a spherical cap. At a central region 78, the foaming section 72 is arranged further downstream at the edge of the foaming section 72. The central region 78 comprises approximately 30% of the diameter of the round foaming section 72.

Auf der dem Siebelement 70 zugewandten Seite ist am Zentralbereich 78 ein Vorsprungsbereich 80 angeordnet. Am Vorsprungsbereich 80 weicht die Kontur der Lochplatte 74 von der Kugelkalotte ab. Der Vorsprungsbereich 80 ist sockelförmig, näherungsweise scheibenförmig ausgestaltet und auf das Siebelement 70 gerichtet.On the side facing the screen element 70, a projection area 80 is arranged on the central area 78. At the projection area 80, the contour of the perforated plate 74 deviates from the spherical cap. The projection region 80 is in the form of a pedestal, approximately disc-shaped and directed onto the sieve element 70.

Der Zentralbereich 78 ist umgeben von einer Vielzahl von Durchgangsöffnungen 82 des Aufschäumabschnittes 72. Die Durchgangsöffnungen 82 sind rund und beispielsweise als Bohrungen des Aufschäumabschnittes 72 ausgestaltet. Sie verlaufen parallel zur Achse 36. Insgesamt sind ungefähr 30 Durchgangsöffnungen 82 vorhanden, die in zwei Reihen den Zentralbereich 78 umgeben. Der Durchmesser der Durchgangsöffnungen 82 beträgt ungefähr 1 Millimeter bis 1,5 Millimeter, beispielsweise 1,2 Millimeter.The central region 78 is surrounded by a multiplicity of passage openings 82 of the foaming section 72. The passage openings 82 are round and designed, for example, as bores of the foaming section 72. They extend parallel to the axis 36. Overall, there are approximately 30 through-holes 82 which surround the central region 78 in two rows. The diameter of the through holes 82 is about 1 millimeter to 1.5 millimeters, for example, 1.2 millimeters.

Der Rand 76 weist einen Randabschnitt 84 auf, der dem Abschnitt 64 der Düsenanordnung 48 zugewandt ist. Der Randabschnitt 84 ist ringförmig, wobei er sich entlang des gesamten Umfanges um die Achse 36 erstreckt. Der Randabschnitt 84 bildet ein Klemmelement 86, über das das Aufschäumelement 68 klemmend im Strömungskanal 18 fixiert werden kann. Dabei verklemmt das Klemmelement 86 mit der Wandung 40. Das Klemmelement 86 ist verformbar ausgestaltet und hat in Bezug auf den Durchmesser des Strömungskanals 18 ein Übermaß (in Figur 4 anhand einer gestrichelten Kontur 88 symbolisiert). Wird das Aufschäumelement 68 in den Strömungskanal 18 bei der Montage eingesetzt, verformt sich das Klemmelement 86 und ist über eine Presspassung mit der Wandung 40 verklemmt. Dadurch wird eine besonders zuverlässige Fixierung des Aufschäumelementes 68 erzielt.The rim 76 has an edge portion 84 which faces the portion 64 of the nozzle assembly 48. The edge portion 84 is annular, extending around the axis 36 along the entire circumference. The edge portion 84 forms a clamping element 86, via which the foaming element 68 can be fixed in the flow channel 18 in a clamping manner. In this case, the clamping element 86 clamped to the wall 40. The clamping element 86 is designed deformable and has in relation to the diameter of the flow channel 18 is an oversize (in FIG. 4 symbolized by a dashed contour 88). If the foaming element 68 is inserted into the flow channel 18 during assembly, the clamping element 86 deforms and is clamped to the wall 40 via a press fit. As a result, a particularly reliable fixation of the foaming element 68 is achieved.

Aufgrund der Presspassung bildet der Randabschnitt 84 zugleich ein Dichtelement. Das Dichtelement stellt sicher, dass Reinigungsmittel nicht seitlich am Aufschäumelement 68 vorbei durch den Strömungskanal 18 strömt, sondern nur durch den Aufschäumabschnitt 72 hindurch.Due to the interference fit, the edge portion 84 also forms a sealing element. The sealing element ensures that cleaning agent is not on the side of the Foaming element 68 passes through the flow channel 18, but only through the foaming section 72 therethrough.

In Richtung des Siebelementes 70 umfasst der Rand 76 einen Randabschnitt 90. Der Randabschnitt 90 ist radial innenseitig in Bezug auf den Randabschnitt 84 angeordnet und hülsenförmig ausgestaltet, wobei er sich entlang des gesamten Umfanges um die Achse 36 erstreckt. Eine Aufnahme 92 ist am Rand 76 zwischen den Randabschnitten 84 und 90 angeordnet. Die Aufnahme 92 ist eine Rastaufnahme und vorliegend als Ringnut 94 ausgestaltet, die entlang des gesamten Außenumfangs am Aufschäumelement 68 angeordnet ist.In the direction of the screen element 70, the edge 76 comprises an edge portion 90. The edge portion 90 is radially inwardly disposed with respect to the edge portion 84 and sleeve-shaped, wherein it extends around the axis 36 along the entire circumference. A receptacle 92 is disposed at the edge 76 between the edge portions 84 and 90. The receptacle 92 is a latching receptacle and in the present case designed as an annular groove 94, which is arranged along the entire outer circumference of the frothing element 68.

Das Siebelement 70 umfasst einen im Strömungskanal 18 angeordneten Siebabschnitt 96. Der Siebabschnitt 96 ist quer zur Strömungsrichtung 46 ausgerichtet und als Lochplatte 97 ausgestaltet. In Strömungsrichtung 46 weist der Siebabschnitt 96 eine Wölbung auf, näherungsweise in Form eines Kegelmantels. Der Siebabschnitt 96 ist außenseitig von einem Rand 98 des Siebelementes 70 umgeben.The sieve element 70 comprises a sieve section 96 arranged in the flow channel 18. The sieve section 96 is aligned transversely to the flow direction 46 and designed as a perforated plate 97. In the flow direction 46, the screen section 96 has a curvature, approximately in the form of a conical jacket. The sieve section 96 is surrounded on the outside by an edge 98 of the sieve element 70.

Zentral am Siebabschnitt 96 ist ein Zentralbereich 100 angeordnet. Am Zentralbereich 100 ist der Siebabschnitt 96 frei von Durchgangsöffnungen. Der Zentralbereich erstreckt sich über ungefähr 10% bis 15% des Durchmessers des runden Siebabschnittes 96. Eine Vielzahl von Durchgangsöffnungen 102 umgibt den Zentralbereich 100. Die Durchgangsöffnungen 102, beispielsweise Bohrungen, sind parallel zueinander und parallel zur Achse 36 ausgerichtet.Central to the screen section 96, a central region 100 is arranged. At the central region 100, the strainer section 96 is free of passage openings. The central region extends over approximately 10% to 15% of the diameter of the round mesh section 96. A plurality of through holes 102 surround the central region 100. The through holes 102, for example bores, are aligned parallel to one another and parallel to the axis 36.

Die Durchgangsöffnungen 102 weisen einen Durchmesser von ungefähr 0,3 Millimeter bis 0,7 Millimeter und beispielsweise ungefähr 0,5 Millimeter auf. Insgesamt sind vorliegend ungefähr 200 bis 250 Durchgangsöffnungen 102 vorhanden. Damit übersteigt die Anzahl der Durchgangsöffnungen 102 diejenige der Durchgangsöffnungen 82 erheblich. Die Durchgangsöffnungen 102 sind außerdem kleiner als die Durchgangsöffnungen 82, vorliegend erheblich kleiner, wobei der Querschnitt etwa ein Fünftel bis ein Sechstel desjenigen der Durchgangsöffnungen 82 beträgt.The passage openings 102 have a diameter of approximately 0.3 millimeters to 0.7 millimeters and, for example, approximately 0.5 millimeters. Overall, in the present case about 200 to 250 through holes 102 are present. Thus, the number of through holes 102 exceeds that of the through holes 82 considerably. The passage openings 102 are also smaller than the passage openings 82, in the present case considerably smaller, the cross section being approximately one fifth to one sixth of that of the passage openings 82.

Auf der dem Aufschäumelement 68 zugewandten Seite ist am Zentralbereich 100 ein Vorsprungsbereich 103 angeordnet. Am Vorsprungsbereich 103 umfasst der Siebabschnitt 96 einen zapfenförmigen Vorsprung in Richtung des Aufschäumabschnittes 72. Der Vorsprung ist koaxial zum Vorsprungsbereich 80 ausgerichtet.On the side facing the foaming element 68, a projection region 103 is arranged on the central region 100. At the projecting portion 103, the screen portion 96 includes a pin-shaped projection in the direction of the foaming portion 72. The projection is coaxially aligned with the projecting portion 80.

Der Rand 98 bildet ein Stützelement 104, über das sich das Siebelement 70 an der Ringschulter 44 entgegen der Strömung des Reinigungsmittels abstützen kann. Außerdem umfasst der Rand 98 einen Randabschnitt 106 an der der Wandung 40 zugewandten Seite. Der Randabschnitt 106 ist hülsenförmig und in Umfangsrichtung der Achse 36 geschlossen. Der Randabschnitt 106 ist radial außerhalb des Randabschnittes 90 angeordnet und liegt an diesem an. An dem dem Stützelement 104 abgewandten Ende weist der Randabschnitt 106 einen Vorsprung 108 auf. Der Vorsprung 108 bildet ein Rastelement in Gestalt eines Wulstes 110. Der Wulst 110 erstreckt sich längs des gesamten Umfanges des Randabschnittes 106.The edge 98 forms a support element 104, via which the sieve element 70 can be supported on the annular shoulder 44 against the flow of the cleaning agent. In addition, the edge 98 comprises an edge portion 106 on the wall 40 facing side. The edge portion 106 is sleeve-shaped and closed in the circumferential direction of the axis 36. The edge portion 106 is disposed radially outside of the edge portion 90 and is applied to this. At the end remote from the support element 104, the edge section 106 has a projection 108. The projection 108 forms a latching element in the form of a bead 110. The bead 110 extends along the entire circumference of the edge portion 106.

Der Wulst 110 kann mit der Ringnut 94 zusammenwirken und in diese eingreifen. Dies ermöglicht es, das Siebelement 70 und das Aufschäumelement 68 miteinander zu verbinden und insbesondere miteinander zu verrasten. Dies erleichtert die Montage. Das Aufschäumelement 68 und das Siebelement 70 können getrennt voneinander, insbesondere als Kunststoffformteile, bereitgestellt und im miteinander verbundenen Zustand in den Strömungskanal 18 und insbesondere den Düsenkörper 30 eingesetzt werden. Entgegen der Strömungsrichtung 46 können sie sich an der Ringschulter 44 abstützen und zusätzlich durch den Presssitz des Klemmelementes 86 mit der Wandung 40 fixiert sein.The bead 110 may cooperate with and engage the annular groove 94. This makes it possible to connect the sieve element 70 and the foaming element 68 together and in particular to lock together. This facilitates the assembly. The frothing element 68 and the sieve element 70 can be provided separately from one another, in particular as plastic molded parts, and inserted in the interconnected state into the flow channel 18 and in particular the nozzle body 30. Contrary to the flow direction 46, they can be supported on the annular shoulder 44 and additionally fixed by the interference fit of the clamping element 86 with the wall 40.

Im miteinander verbundenen Zustand des Aufschäumelementes 68 und des Siebelementes 70 ist zwischen dem Aufschäumabschnitt 72 und dem Siebabschnitt 96 ein Aufschäumraum 112 gebildet, da der Aufschäumabschnitt 72 und der Siebabschnitt 96 längs der Achse 36 voneinander beabstandet sind. Quer zur Strömungsrichtung 46 ist der Aufschäumraum 112 durch eine doppelte Wand begrenzt, wobei der Randabschnitt 90 des Aufschäumelementes 68 und der Randabschnitt 106 des Siebelementes 70 jeweils eine Wand der Doppelwand ausbilden. Die aus den Randabschnitten 90 und 106 gebildete Doppelwand ermöglicht es, den Aufschäumraum 112 in Umfangsrichtung so abzudichten, dass im Wesentlichen kein Reinigungsmittel seitlich am Siebabschnitt 96 vorbei zwischen Siebelement 70 und Wandung 40 strömt.In the interconnected state of the foaming element 68 and the sieve element 70, a foaming space 112 is formed between the foaming section 72 and the sieve section 96, since the foaming section 72 and the sieve section 96 are spaced apart along the axis 36. Transverse to the flow direction 46 of the Aufschäumraum 112 is a double Wall bounded, wherein the edge portion 90 of the foaming element 68 and the edge portion 106 of the screen element 70 each form a wall of the double wall. The double wall formed from the edge portions 90 and 106 makes it possible to seal the foaming space 112 in the circumferential direction so that substantially no cleaning agent flows laterally past the sieve portion 96 between the sieve element 70 and the wall 40.

Das Gemisch aus Trägerflüssigkeit (insbesondere Wasser), Reinigungschemikalie und Luft (aufschäumbares Reinigungsmittel) wird, wie bereits erwähnt, durch die Düsenanordnung 48 beschleunigt und entspannt sich im Stauraum 66. Es bildet sich aufgrund des Aufschäumelementes 68 strömungsaufwärts des Aufschäumabschnittes 72 ein vergleichsweise großer Staudruck. Dabei können Luftblasen im Reinigungsmittel verkleinert werden. Unter der Wirkung der Strömung tritt das Reinigungsmittel durch den Aufschäumabschnitt 72 an den Durchgangsöffnungen 82 hindurch. Es bilden sich Verwirbelungen, die zum Aufschäumen des Reinigungsmittels im Aufschäumraum 112 führen.The mixture of carrier liquid (especially water), cleaning chemical and air (foamable detergent) is, as already mentioned, accelerated by the nozzle assembly 48 and relaxes in the storage space 66. It forms due to the Aufschäumelementes 68 upstream of the Aufschäumabschnittes 72, a relatively large back pressure. In this case, air bubbles in the detergent can be reduced. Under the effect of the flow, the cleaning agent passes through the foaming section 72 at the through-holes 82. There are turbulences, which lead to foaming of the detergent in Aufschäumraum 112.

Bei nachfolgendem Durchtritt des Reinigungsschaums durch die Durchgangsöffnungen 102 des Siebabschnittes 96 wird das Reinigungsmittel noch weiter aufgeschäumt. Aufgrund des geringeren Querschnitts der Durchgangsöffnungen 102 gegenüber den Durchgangsöffnungen 82 werden im Schaum vorhandene Luftbläschen verkleinert, was zu einem weiteren Aufschäumen des Reinigungsmittels führt.During subsequent passage of the cleaning foam through the passage openings 102 of the screen section 96, the cleaning agent is further foamed. Due to the smaller cross section of the passage openings 102 with respect to the passage openings 82, air bubbles present in the foam are reduced, which leads to a further foaming of the cleaning agent.

Strömungsabwärts des Siebabschnittes 96 ist dann ein formstabiler, fester Reinigungsschaum bereitgestellt, mit dem eine sehr gute Reinigungswirkung erzielt werden kann. Die Beschaffenheit des Reinigungsschaumes und seine Formstabilität erlauben es auch insbesondere, mit dem Strahlformungselement 32 einen Flachstrahl mit einem guten Strahlprofil zu formen. Das gute Strahlprofil begünstigt die Reinigungswirkung, die von dem mit der Schaumerzeugungsvorrichtung 10 abgegebenen Reinigungsschaum erzielt werden kann.Downstream of the screen section 96 is then provided a dimensionally stable, solid cleaning foam with which a very good cleaning effect can be achieved. The nature of the cleaning foam and its dimensional stability also make it possible, in particular, to form a flat jet with a good beam profile with the beam-shaping element 32. The good beam profile favors the cleaning effect that can be achieved by the cleaning foam delivered with the foam-generating device 10.

Als vorteilhaft für das Strahlprofil erweist es sich, dass der Aufschäumabschnitt 72 den Zentralbereich 78 frei von Durchgangsöffnungen 82 aufweist und der Siebabschnitt 96 den Zentralbereich 100 frei von Durchgangsöffnungen 102. Das Reinigungsmittel durchsetzt den Aufschäumabschnitt 72 und den Siebabschnit7 96 dadurch nicht zentral, sondern radial außerhalb der jeweiligen Zentralbereiche 78, 100 und in Folge dessen eher an den der Wandung 40 zugewandten Bereichen des Aufschäumabschnittes 72 und des Siebabschnittes 96. Für die gleiche Wirkung erweist es sich auch als vorteilhaft, dass im Aufschäumraum 112 der Vorsprungsbereich 80 und der Vorsprungsbereich 103 angeordnet sind. Die Ausbildung eines sogenannten "Freistrahles", im Wesentlichen zentriert um die Achse 36, kann dadurch vermieden werden.It proves to be advantageous for the jet profile that the foaming section 72 has the central region 78 free of passage openings 82 and the sieve section 96 the central region 100 free of passage openings 102. The cleaning agent passes through the foaming section 72 and the Siebabschnit7 96 not centrally, but radially outside For the same effect, it proves to be advantageous that in the Aufschäumraum 112, the projecting portion 80 and the projecting portion 103 are arranged in the Aufschäumraum 112 of the respective central regions 78, 100 and, consequently, on the walls 40 of the foaming section , The formation of a so-called "free jet", substantially centered about the axis 36, can be avoided.

Weiter erweist es sich als vorteilhaft für ein gutes Strahlprofil, dass sich der Strömungskanal 18 strömungsabwärts des Siebabschnittes 96 kontinuierlich in Richtung auf das Strahlformungselement 32 verjüngt.Furthermore, it proves advantageous for a good beam profile that the flow channel 18 downstream of the screen section 96 tapers continuously in the direction of the beam-shaping element 32.

Günstig ist es, dass die Erzeugung von Reinigungsschaum bei der Schaumerzeugungsvorrichtung 10 zweistufig erfolgt, nämlich durch das Aufschäumelement 68 und das strömungsabwärts angeordnete Siebelement 70. Dadurch kann der formstabile Reinigungsschaum mit sehr kleinen Bläschen bereitgestellt werden, ohne dass die Gefahr besteht, dass ein "Rückstau" von Schaum im Düsenkörper 48 derart erfolgt, dass der Schaum durch die Eintrittsöffnung 54 unerwünschterweise aus dem Strömungskanal 18 austritt.It is favorable that the generation of cleaning foam takes place in two stages in the foam-generating device 10, namely by the frothing element 68 and the downstream sieve element 70. As a result, the dimensionally stable cleaning foam can be provided with very small bubbles without the risk of a "backflow Foam in the nozzle body 48 takes place in such a way that the foam escapes undesirably from the flow channel 18 through the inlet opening 54.

Claims (18)

  1. Foam-generating apparatus, in particular as an accessory for a high-pressure cleaning appliance, which comprises or forms a flow channel (18) and comprises a nozzle body (30) with an outlet opening (34) as well as a foaming element (68) which has a foaming section (72) which is arranged in the flow channel (18) upstream of the outlet opening (34) and has through-openings (82), wherein a foamable cleaning agent flows through the flow channel (18) up to the outlet opening (34) and is foamed upon passing through the foaming section (72), wherein the nozzle body (30) comprises at the outlet opening (34) a jet-forming element (32) for forming a flat jet of the foamed cleaning agent, wherein the foam-generating apparatus (10) comprises a screen element (70) which has a screen section (96) arranged in the flow channel (18), wherein the screen section (96) is arranged downstream of the jet-forming element (32) and at a distance therefrom, and wherein the screen section (96) has through-openings (102) which are smaller than the through-openings (82) of the foaming section (72), characterized in that the foaming section (72) and/or the screen section (96) have a central opening-free region (78, 100) which is free of through-openings (82, 102) and is surrounded by through-openings (82, 102).
  2. Foam-generating apparatus in accordance with Claim 1, characterized in that the cross section of the through-openings (82) of the foaming section (72) is about four times to eight times as large as the cross section of the through-openings (102) of the screen section (96).
  3. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the number of the through-openings (102) of the screen section (96) is about five times to ten times as high as the number of the through-openings (82) of the foaming section (82).
  4. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the through-openings (82, 102) of the foaming section (72) and/or the screen section (96) are round and/or aligned parallel to each other.
  5. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the foaming section (72) and/or the screen section (96) are configured as perforated plates (74, 97).
  6. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that a foaming chamber (112) for the cleaning agent is formed between the foaming section (72) and the screen section (96), and in that at least one wall (90, 106) is provided which delimits the foaming chamber (112) transverse to the flow direction (46) of the cleaning agent.
  7. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the foaming section (72) has a central projection region (80) projecting in the direction of the screen section (96) and/or in that the screen section (96) has a central projection region (103) projecting in the direction of the foaming section (72).
  8. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the foaming section (72) and/or the screen section (96) have an arching or curvature in the in the flow direction (46) of the cleaning agent.
  9. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the cross section of the flow channel (18) downstream of the screen section (96) continuously tapers in the direction of the jet-forming element (32).
  10. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the foaming element (68) and the screen element (70) are formed separately from each other and are connected to each other, in particular by latching.
  11. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the foaming element (68) and/or the screen element (70) are insertion elements which are inserted into the flow channel (18) and which are supported on a stop (42) on the flow channel (18) against the flow direction (46) of the cleaning agent.
  12. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that at least one clamping element (86) is arranged on the foaming element (68) and/or on the screen element (70) for clamping to a wall arrangement (40) of the flow channel (18).
  13. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the foaming element (68) and/or the screen element (70) are configured as one piece, in particular as a plastic moulded part.
  14. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the foam-generating apparatus (10) defines an axis (36) about which the nozzle body (30) is rotatable, wherein the foaming element (68) and the screen element (70) are preferably non-rotatably held on the nozzle body (30).
  15. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that on the flow channel (18) upstream of the foaming element (68) at least one inlet opening (54) is formed for air which is admixable with the cleaning agent.
  16. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the flow channel (18) upstream of the foaming element (68) comprises a nozzle arrangement (48) with which the cleaning agent in the flow channel (18) is able to be accelerated and which forms a retaining chamber (66) directly upstream of the foaming element (68), wherein the flow channel (18) continuously expands in the retaining chamber (66) in the direction to the foaming element (68).
  17. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the foam-generating apparatus (10) comprises a connecting device (28) for connecting a cleaning agent container (12) and an admixing device (22) by way of which a cleaning chemical is able to be aspirated from the cleaning agent container (12) and is admixable with a carrier liquid in the flow channel (18), preferably in that the admixing device (22) comprises a venturi injector (24).
  18. Foam-generating apparatus in accordance with any one of the preceding Claims, characterized in that the foam-generating apparatus (10) comprises a connecting device (20) for connecting to a high-pressure pistol or a jet pipe of a high-pressure cleaning appliance.
EP13727228.2A 2013-06-07 2013-06-07 Foam generation device Active EP3003541B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/061842 WO2014194967A1 (en) 2013-06-07 2013-06-07 Foam generation device

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DK3473104T3 (en) * 2017-10-19 2020-09-14 Anoxia B V A method of performing a procedure on an animal that involves anesthetizing and / or killing the animal

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US2492037A (en) * 1945-05-08 1949-12-20 Rockwood Sprinkler Co Apparatus for generating foam
US3388868A (en) * 1965-10-29 1968-06-18 Nalco Chemical Co Foam producing nozzle
SU958105A1 (en) * 1980-12-05 1982-09-15 Государственный Научно-Исследовательский Институт Строительных Материалов И Изделий Apparatus for preparing foam for engineering purposes
DE202006007314U1 (en) 2006-05-05 2006-07-20 Suttner Gmbh Foam generator for foaming water, useful for attachment to a high-pressure cleaning device, includes a container for a chemical to be added to the water
WO2011075657A2 (en) * 2009-12-18 2011-06-23 The Procter & Gamble Company Foam oxidative hair colorant composition
DE202010002089U1 (en) * 2010-02-09 2010-06-24 Mei Thung Co., Ltd., Wuri Township foam generator
DE202011050649U1 (en) * 2011-07-07 2011-10-24 Wu-Chiao Chou foam generator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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