EP0264689A1 - Appareil producteur de mousse - Google Patents

Appareil producteur de mousse Download PDF

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Publication number
EP0264689A1
EP0264689A1 EP87114387A EP87114387A EP0264689A1 EP 0264689 A1 EP0264689 A1 EP 0264689A1 EP 87114387 A EP87114387 A EP 87114387A EP 87114387 A EP87114387 A EP 87114387A EP 0264689 A1 EP0264689 A1 EP 0264689A1
Authority
EP
European Patent Office
Prior art keywords
chamber
outlet
channel
flow
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87114387A
Other languages
German (de)
English (en)
Other versions
EP0264689B1 (fr
Inventor
Ulrich Brandstetter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT87114387T priority Critical patent/ATE81306T1/de
Publication of EP0264689A1 publication Critical patent/EP0264689A1/fr
Application granted granted Critical
Publication of EP0264689B1 publication Critical patent/EP0264689B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/311—Injector mixers in conduits or tubes through which the main component flows for mixing more than two components; Devices specially adapted for generating foam
    • B01F25/3111—Devices specially adapted for generating foam, e.g. air foam
    • B01F25/31112—Devices specially adapted for generating foam, e.g. air foam with additional mixing means other than injector mixers, e.g. screen or baffles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/235—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids for making foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
    • B01F25/3121—Injector 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

Definitions

  • the invention relates to a device for producing foam with the features of the preamble of claim 1.
  • a generic device working on the principle of the jet pump is known from DE-OS 26 38 000 and contains a mixing chamber in which a total of three pipes open. Two of these tubes are arranged in an extension and coaxially to form a gap. One of these pipes is used to supply compressed air in order to draw water into the mixing chamber via the third pipe, which is sucked out of the mixing chamber through the gap into the extension of the air supply pipe.
  • the air-water mixture thus obtained continues to flow through the outlet pipe in the direction of a series of screens oriented transversely to the flow, which are intended to improve the foam quality and generate additional turbulence in the flowing gas-air mixture.
  • Water-wax mixtures as are required for the surface preservation of metal parts, for example motor vehicle bodies, can practically not be foamed using the known device. Although a kind of foam is produced, the gas bubbles contained therein have very different sizes, which leads to a very uneven foam jet. In addition, the foam is therefore not very stable.
  • the flow resistance increases because of the sieve contained, which represents a flow obstacle, which is why the throwing distance and the flow pressure usable at the outlet of the device are correspondingly low.
  • an expansion chamber is arranged behind the annular-gap-shaped channel, in which the pressure in the gas bubbles can be reduced.
  • the device If the device is to be used to generate a jet of foam which is discharged into the open, a good concentration of the jet can be achieved if the outlet contains a Laval nozzle. This largely prevents the foam jet from bursting as a result of the internal pressure which has not yet been reduced to atmospheric pressure. With the help of the Laval nozzle, the pressure in the foam jet can be converted into speed.
  • a shortening of the device can be achieved if the annular gap-shaped channel is folded back in itself, so that several coaxially extending sections are formed which are connected to one another at deflection points. This also makes it possible to adapt the cross section of the annular gap to the pressure decreasing in the direction of the outlet. If there are sharp edges at the deflection points at which the annular-gap-shaped channels merge into one another, this further improves the development of turbulence.
  • a favorable compromise between flow resistance on the one hand and foam quality on the other hand arises when the ratio between the inside diameter in the case of an annularly shaped channel to the outside diameter is between 1.2 and 2, preferably between 1: 1.5 and 1: 1.8. In a preferred embodiment, a ratio of 1: 1.67 has been found to be favorable.
  • FIG. 1 and 2 show a device 1 for producing foam, which has an essentially cylindrical housing 2, in which two mutually coaxial, one behind the other chambers 3 and 4 are contained with likewise cylindrical shape.
  • the first chamber 3, which extends in the longitudinal direction of the housing 2, is connected to a connecting piece 7 via a bore 6 running through a rear side 5 of the housing 2. Via the connecting piece 7, the device 1 can be connected to a source (not shown) for a pressurized liquid.
  • Another Kan al 8 opens laterally or radially into the first chamber 3 and connects the chamber 3 with a connecting piece 9, via which the device 1 can be connected to a source, also not shown, for pressurized gas
  • the first chamber 3 is followed by the second cylindrical chamber 4, which has a continuously smooth cylindrical inner wall 10.
  • the chamber 4 has a constant diameter up to its outlet 11 which is appreciably larger than the diameter of the chamber 3 and also has a considerable length compared to the axial extension of the chamber 3.
  • a cylindrical filling body 12 which has two flat end faces 13 and 14. It is supported by means of three spoke-like struts 15, which are arranged in the vicinity of the front ends 13 and 14, in the interior of the chamber 4, so that it runs coaxially with the cylindrical inner wall 10. Its flat end face 13 is at a short axial distance from the mouth the chamber 3 in the chamber 4 opposite, while the end face 14 is opposite the outlet 11. In this way, an annular gap-shaped channel 16 is formed between the cylindrical inner wall 10 and the outer wall of the cylindrical packing 12, which extends almost over the entire length of the chamber 4, namely starting at the mouth of the chamber 3 up to the outlet 11.
  • Laval nozzle 17 which contains in a known manner two approximately frusto-conical channel sections 18 and 19 which merge into one another at 21 with their smaller diameters.
  • the larger diameter of the frustoconical section 19 forms an outlet 22 through which a foam produced leaves the device 1.
  • the device described so far works in such a way that, for example, water is supplied at a pressure of approximately 2 bar via the inlet connection 7, and air is fed in at approximately the same pressure via the inlet connection 9.
  • the supplied water and the supplied air mix to form large bubbles in the chamber 3, from which the water / air mixture flows into the chamber 4.
  • the gap width of the annular gap-shaped channel 16 is dimensioned such that a turbulent flow arises at the feed pressures of air and water, in which shear forces occur which reduce the gas bubbles ever further until the resulting toughness of the foam prevents further reduction of the gas bubbles.
  • the resulting foam finally flows out into the open via the Laval nozzle 17 as a compact foam jet.
  • the end face 14 of the filler body 12 is at a considerable distance from the outlet 11, so that an expansion chamber 24 is formed, into which the foam produced opens out from the annular gap 16.
  • the foam can further relax in the expansion chamber 24 before it exits through the Laval nozzle 17.
  • the inside width of the chamber 4 is approximately 30.5 mm, while the outer diameter of the filling body 12 in the case of the embodiment according to FIG. 1 is approximately 18 mm and in the case of the embodiment according to 3 is approximately 15.5 mm.
  • the lengths here are approximately 30 mm for the chamber 3 and 200 mm for the chamber 4, each measured up to the end face 14 of the filler 12, while the expansion chamber 24 has an approximate length of 100 mm.
  • the Laval nozzle 17 finally has a length of approximately 60 mm.
  • a device 1 for producing foam in which the annularly shaped channel 16 is folded several times in itself, so that overall the arrangement is shortened.
  • the annularly shaped channel 16 is largely free of flow obstacles, apart from those struts that are necessary to the individual To hold pipe sections and packing coaxially to each other.
  • Fig. 4 shows a device 1 for producing foam, which essentially has four coaxial cylindrical tubes 25, 26, 27 and 28, of which the tube 28 simultaneously represents the outer housing 2, in one end of which from the end face a closure piece 29 is inserted in a sealed manner.
  • the other end of the tube 28, which has been cylindrical until then, is conically or conically tapered from a point 31 to form a nozzle 32 and merges beyond the nozzle 32 into an outlet 33, the diameter of which is substantially smaller than the inside diameter of the tube 28.
  • the closure piece 29 consists of a cap 34, on which a cylindrical extension 35 is formed, which is inserted in the tube 28 and is permanently attached there, for example by means of cold welding.
  • the closure piece 29 contains a concentric bore 36, into which an essentially tubular feed head 37 is inserted in a sealed manner.
  • the feed head 37 is approximately T-shaped and consists of pipe sections 38, 39 and 41 which are connected to one another in one piece, of which the pipe sections 38 and 41 run coaxially and in an extension to one another, while the pipe section 39 extends at right angles thereto.
  • the pipe section 41 is sealed in the bore 36 of the closure piece 29 and protrudes slightly beyond the bottom of the cap 34 inside.
  • the pipe 26 is inserted in a sealed manner, which ends at a flat end face which forms an outlet 47 which is located shortly before the start of the nozzle-shaped taper 32.
  • the pipe 26 is connected in terms of flow to the pipe section 39, on the free end of which a fitting 43 is placed in a sealed manner and to which a liquid supply line 44 can be connected.
  • a fitting 45 is also sealed on the pipe section 38, which on the one hand seals the pipe section 38 to the outside and in which on the other hand the pipe 25 is inserted in a sealed manner.
  • the fitting 45 forms a connection for a gas supply line 46, through which gas or air is to be fed into the pipe 25, which leads coaxially through the pipe sections 38 and 41 into the pipe 26 and which ends at an opening 47.
  • the mouth 47 jumps back, as shown, a considerable distance from the outlet 42 of the tube 26.
  • the tube 27 is located exclusively in the interior of the tube 28 and concentrically surrounds a part of the tube 26 located in the interior of the tube 28.
  • the tube 27 is closed by a closure piece 48, which consists of a threaded shoulder 49 and there is an integrally molded hexagonal cap 51 thereon.
  • the cap 51 protrudes radially at least with its corners over the outer circumferential surface of the tube 27, as can be seen in FIGS. 6 and 7.
  • the closure piece 48 With the cylindrical threaded shoulder 49, the closure piece 48 is screwed into the tube 27 in a sealed manner, while the cap 51 lies against the frustoconical inner surface of the conically tapering nozzle 32.
  • the end of the tube 7 containing the closure piece 48 is thus fixed radially in the device 1 with respect to its longitudinal axis.
  • the other end of the tube 27 is fixed in the vicinity of the closure piece 29 by means of two struts in the radial direction Rich, which extend between the outer peripheral surface of the tube 27 and the inner peripheral surface of the tube 28.
  • the struts 53 and 54 have approximately the shape of ring sectors. They have an extension angle of approximately 90 ° and are diametrically opposite to one another with respect to the longitudinal axis of the device 1.
  • these struts 53 and 54 are used to axially fix the tube 27, which is permanently connected to the struts 53 and 54.
  • the struts 53 and 54 are in turn permanently attached to the tube 28.
  • a cylindrical gap 56 is formed in this way, which begins at the height of the outlet 42 and which ends at an outlet 57, which is delimited by corresponding flat end faces of the tube 26.
  • throttle points in the form of struts 58 and 59 or 61 and 62 in the form of ring sector-shaped struts can be provided in the annular gap or annular channel 56.
  • These struts 58 ... 62 also fix the tube 26 in the radial direction relative to the tube 27.
  • the device 1 described so far is operated as follows: Via the line 44, water provided with a foaming agent and optionally other additives, such as wax, is supplied at a pressure between 3 and 10 bar, with a corresponding choice of the material also higher, up to the breaking strength.
  • the water fed in flows through the annular gap formed between the pipe 25 and the pipe 26 in the direction of the outlet 42.
  • a gas preferably air
  • the fed-in air flows through the pipe 25 and arrives at the mouth 47 into the liquid flow surrounding the pipe 25 in order to mix with it with the formation of bubbles.
  • the resulting gas-liquid mixture or air-water mixture continues to flow through the tube 26 in the direction of the outlet 42.
  • the flow becomes omniazimuthal with respect to the longitudinal direction of the device 1 deflected twice by 90 °, namely once on the inner edge 63, ie the edge at which the inner wall of the tube 26 merges into the flat end face and a second time on the outer edge 64, ie on the edge at which the flat end face in the outer wall merges.
  • the gas-liquid mixture flows back through the relatively narrow annular gap 56 in the direction of the feed head 37, i.e. against the direction of flow in the chamber delimited by the tube 26.
  • the mixture first meets the throttle point from the two sector-shaped struts 58 and 59, which reduce the cross-sectional area of the annular gap 56 by half, while the flow behind it can again extend to the entire cross-sectional area of the annular gap 56.
  • the flow again meets two sector-shaped struts, namely the sector-shaped struts 61 and 62, which in turn reduce the flow cross-section by half before reaching the outlet opening 57, ie before the end of the annular gap 56.
  • the mixture in which the gas or air bubbles are now very finely and evenly distributed, arrives at the outlet opening 57, at which the flow is again sharply deflected twice by 90 °.
  • One inner sharp edge is the edge 66 on which the inner wall of the tube 27 merges into its end face, while the second radially further outward sharp edge 67 is the one on which the end face merges into the outer wall of the same tube 27.
  • the foam formed from the gas-water mixture flows again in the same direction as in the tube 26, namely in a cylindrical annular gap 68 which is delimited by the outer wall 27 and the inner wall of the tube 28 is. Because of this Annular gap 68 has a larger cross-sectional area than the annular gap 56, after the deflection behind the outlet opening 57 there is initially a calming in the flow.
  • the resulting foam can either go outside at the outlet opening 33 or, as shown, a pipe system 69 can be connected to the outlet opening 33 in order to transport the foam to the desired location.
  • the fine-celledness and uniformity of the foam can be further improved if the foam has to flow through a throttle gap with a sharp flow separation edge.
  • a throttle gap is provided in the device 1 according to FIG. 1 in the region of the outlet 57 at 71.
  • the throttle gap 71 is delimited on the one hand by the edge 67 and on the other hand by an edge 72 which is at the same height as the edge 67 with respect to the longitudinal axis of the device 1 and is formed on the cylindrical extension 35.
  • the cylindrical extension 35 is, as the figure shows, provided with a corresponding cavity so that the foam emerging from the outlet 57 enters the cavity of the cylindrical extension 35 and is deflected from there towards the throttle gap 71.
  • the diameter of the stall edge 72 is considerably smaller than the clear width of the tube 28 in which the cylindrical extension 35 is inserted, so that considerable turbulence can arise in the foam at the stall edge 72.
  • the surrounding edge of the cylindrical extension 35 jumps radially outward at right angles.
  • the cap 51 acting as a throttle body gives the foam jet a swirl, which can be achieved in that the side faces of the cap 51, which is hexagonal in cross section, are slightly deformed in a helical manner.
  • the flow path for the foam which is folded twice in the device shown, can be further folded by arranging further chambers, which are then likewise connected to one another by throttling points and deflection points.
EP87114387A 1986-10-09 1987-10-02 Appareil producteur de mousse Expired - Lifetime EP0264689B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87114387T ATE81306T1 (de) 1986-10-09 1987-10-02 Vorrichtung zum erzeugen von schaum.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3634361 1986-10-09
DE19863634361 DE3634361A1 (de) 1986-10-09 1986-10-09 Vorrichtung zum erzeugen von schaum

Publications (2)

Publication Number Publication Date
EP0264689A1 true EP0264689A1 (fr) 1988-04-27
EP0264689B1 EP0264689B1 (fr) 1992-10-07

Family

ID=6311355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114387A Expired - Lifetime EP0264689B1 (fr) 1986-10-09 1987-10-02 Appareil producteur de mousse

Country Status (3)

Country Link
EP (1) EP0264689B1 (fr)
AT (1) ATE81306T1 (fr)
DE (2) DE3634361A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477846A1 (fr) * 1990-09-25 1992-04-01 Praxair Technology, Inc. Dispersion gaz/liquide en ligne
NL1019212C2 (nl) * 2001-10-23 2002-08-20 Theodorus Alphonsius Niemeijer Werkwijze en inrichting voor het behandelen van oppervlakken.
CN110614043A (zh) * 2019-09-25 2019-12-27 芜湖美的厨卫电器制造有限公司 微纳米气泡液体发生装置和出水设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19537239C2 (de) * 1995-03-03 1997-11-06 Heidelberger Baustofftech Gmbh Vorrichtung und Verfahren zur Erzeugung eines geschäumten Bindemittels

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513417A (en) * 1946-02-05 1950-07-04 American La France Foamite Airfoam nozzle
US3117629A (en) * 1960-04-07 1964-01-14 Rotvand Lydie Generator of a mechanical foam for fire extinguishing purpose
DE2443498A1 (de) * 1973-09-11 1975-04-03 Chemtrust Ind Corp Vorrichtung zum erzeugen von schaum
DE2638000A1 (de) * 1976-08-24 1978-03-09 Licentia Gmbh Verfahren und vorrichtung zur herstellung von in der feuerloeschtechnik verwendetem loeschschaum
US4394289A (en) * 1981-07-01 1983-07-19 Brown Lamar W Continuous foam generating system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042510A (en) * 1976-09-02 1977-08-16 Canton Textile Mills, Inc. Liquid aeration device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513417A (en) * 1946-02-05 1950-07-04 American La France Foamite Airfoam nozzle
US3117629A (en) * 1960-04-07 1964-01-14 Rotvand Lydie Generator of a mechanical foam for fire extinguishing purpose
DE2443498A1 (de) * 1973-09-11 1975-04-03 Chemtrust Ind Corp Vorrichtung zum erzeugen von schaum
DE2638000A1 (de) * 1976-08-24 1978-03-09 Licentia Gmbh Verfahren und vorrichtung zur herstellung von in der feuerloeschtechnik verwendetem loeschschaum
US4394289A (en) * 1981-07-01 1983-07-19 Brown Lamar W Continuous foam generating system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477846A1 (fr) * 1990-09-25 1992-04-01 Praxair Technology, Inc. Dispersion gaz/liquide en ligne
NL1019212C2 (nl) * 2001-10-23 2002-08-20 Theodorus Alphonsius Niemeijer Werkwijze en inrichting voor het behandelen van oppervlakken.
EP1306136A1 (fr) * 2001-10-23 2003-05-02 Theodorus Alphonsius Niemeijer Procédé et arrangement pour le traitement de surfaces
CN110614043A (zh) * 2019-09-25 2019-12-27 芜湖美的厨卫电器制造有限公司 微纳米气泡液体发生装置和出水设备
CN110614043B (zh) * 2019-09-25 2022-05-06 芜湖美的厨卫电器制造有限公司 微纳米气泡液体发生装置和出水设备

Also Published As

Publication number Publication date
DE3782133D1 (de) 1992-11-12
DE3634361A1 (de) 1988-04-21
ATE81306T1 (de) 1992-10-15
EP0264689B1 (fr) 1992-10-07

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