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WO2005042169A1 - Oscillateur fluidique comprenant trois injecteurs et un ilot - Google Patents

Oscillateur fluidique comprenant trois injecteurs et un ilot Download PDF

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Publication number
WO2005042169A1
WO2005042169A1 PCT/US2004/035108 US2004035108W WO2005042169A1 WO 2005042169 A1 WO2005042169 A1 WO 2005042169A1 US 2004035108 W US2004035108 W US 2004035108W WO 2005042169 A1 WO2005042169 A1 WO 2005042169A1
Authority
WO
WIPO (PCT)
Prior art keywords
recited
island
nozzles
interaction chamber
floor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2004/035108
Other languages
English (en)
Inventor
Shridhar Gopalan
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.)
Bowles Fluidics Corp
Original Assignee
Bowles Fluidics Corp
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 Bowles Fluidics Corp filed Critical Bowles Fluidics Corp
Priority to EP04796157A priority Critical patent/EP1675686B1/fr
Priority to DE602004010697T priority patent/DE602004010697T2/de
Publication of WO2005042169A1 publication Critical patent/WO2005042169A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
    • B05B1/08—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape of pulsating nature, e.g. delivering liquid in successive separate quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/22—Oscillators

Definitions

  • This invention relates to fluid handling processes and apparatus. More particularly, this invention relates to a fluidic oscillator that can control the spraying of high viscosity fluids so that such sprays are uniformly distributed over their target areas.
  • Fluidic oscillators are well known in the prior art for their ability to provide a wide range of liquid spray patterns by cyclically deflecting a liquid jet.
  • the operation of most fluidic oscillators is characterized by the cyclic deflection of a fluid jet without the use of mechanical moving parts. Consequently, an advantage of fluidic oscillators is that they are not subject to the wear and tear which adversely affects the reliability and operation of other spray devices. Examples of fluidic oscillators may be found in many patents, including U.S. Patent Nos.
  • the present invention is generally directed to satisfying the needs set forth above and overcoming the disadvantages identified with prior art devices and methods.
  • a fluidic oscillator that is comprised of the following elements: (a) an inlet for the pressurized fluid, (b) a set of three power nozzles that are fed by the pressurized fluid that flow from the inlet, (c) an interaction chamber attached to the nozzles and which receives the flow from the nozzles, wherein this chamber has an upstream and a downstream portion, with the upstream portion having a pair of boundary edges and a longitudinal centerline that is approximately equally spaced between the edges, and wherein one of the power nozzles is located proximate the chamber's longitudinal centerline, (d) a throat from which the spray exhausts from the interaction chamber, and (e) an island located in the interaction chamber, with this island being situated downstream of the power nozzles that is located proximate the chamber's longitudinal centerline.
  • this oscillator is configured such that: (a) one of each of the power nozzles is located proximate each of the chamber's boundary edges, (b) its nozzles are configured to accelerate the movement of the pressurized fluid that flows through the nozzles, (c) its throat has right and left sidewalls that diverge downstream, and (d) the power nozzles and island are oriented and scaled such as to generate flow vortices behind the island that are swept out of the throat in a manner such that these vortices flow alternately proximate the throat's right sidewall and then its left sidewall.
  • FIGS. 1A-1C illustrate the nature of the typical oscillations in the flow of a liquid exhausting from a fluidic oscillator into a gaseous environment and how the droplets of the flow from such an oscillator are swept over the fan angle of 2 ⁇ .
  • FIG. 2 shows a prior art "mushroom oscillator” having an interaction region into which enters the jets from a pair of power nozzles; these jets interact to form interacting vortices which yield an oscillating flow from the fluidic's throat.
  • FIG. 3 illustrates the spray flow from a mushroom oscillator of FIG.
  • FIG. 4 shows an example of a typical fluidic spray device that is mounted in an automobile's hood to spray the front windshield.
  • FIG. 5 A shows a preferred embodiment of the new "three jet island” fluidic circuit of the present invention and the flow phenomena in and from this oscillator at an instant when the vortices formed at the island's trailing edges are equivalent in size.
  • FIG. 5B illustrates more details of the geometry of the interaction chamber, power nozzles and throat shown in FIG. 5A FIG.
  • FIG. 6 shows a preferred embodiment of the new "three jet island” fluidic circuit of the present invention and the flow phenomena in and from this oscillator at an instant when the vortex behind the island's right trailing edge dominates.
  • FIG. 7 shows a preferred embodiment of the new "three jet island” fluidic circuit of the present invention and the flow phenomena in and from this oscillator at an instant when the vortex behind the island's left trailing edge dominates.
  • FIG. 8 illustrates for the fluidic circuit shown in FIGS. 5-7 the spatial distribution of liquid droplets that impact on a plane perpendicular to the path of the spray; with such a distribution being characterized as being uniform across the height of the spray.
  • FIG. 9 shows another preferred embodiment of the new "three jet island” fluidic circuit of the present invention; with this embodiment having a more compact geometry than that of the oscillator shown in FIGS. 5-7.
  • FIG. 10 shows another preferred embodiment of the new "three jet island” fluidic circuit of the present invention; with this embodiment having two rows of staggered filter posts.
  • FIG. 11 illustrates the flat or two-dimensional fan spray that is characteristic of the new "three jet island” fluidic circuits of the present invention.
  • FIGS. 12A - 12B illustrate the top and centerline, side views of the downstream end of a three-jet island oscillator whose interaction chamber has a downward sloped or tapered floor.
  • FIG. 13 illustrates a top-side perspective view of the downstream end of a three-jet island oscillator which has a downward step at each of the points where the power nozzles exit into the interaction chamber.
  • the present invention involves methods for creating fluidic oscillators of the type that are suitable for generating oscillating, fluid jets having very distinctive and controllable flow patterns over a wide range of operating conditions, such as those that are encountered in various automotive windshield, headlamp and rear windshield cleaning applications.
  • FIG. 4 shows an example of a typical fluidic spray device that is mounted in an automobile's hood to spray the front windshield.
  • This fluidic spray device consists of: (a) an automotive housing 10, (b) a check valve 12, consisting of a piston 12a and a spring 12b, which connects at the check valve's downstream end to the inlet of the housing flow tube 14, and at its upstream end to an elbow 16 which directs fluid into the check valve, and (c) a fluid flow or fluidic insert 18 that is inserted into a cavity 20 that has been especially configured in the housing so as to receive the insert and form a fluid-tight seal between the cavity's sealing surfaces 22 and the insert's outer surfaces.
  • fluidic circuits or fluidic oscillators 2 that are suitable for use with these fluidic inserts.
  • At least one power nozzle 24 configured to accelerate the movement of the fluid that flows under pressure through the insert, an interaction chamber 26 through which the fluid flows and in which the fluid flow phenomena is initiated that will eventually lead to the flow from the insert being of an oscillating nature, a fluid source inlet 28, an fluid outlet 30 from which the fluid exits the insert, and filter posts 32 that are located upstream of the power nozzle and serve to filter any larger diameter debris particles that are contained in the fluid flowing through the insert before these particles clog either the downstream power nozzles or the circuit's outlet.
  • the island 34 is located directly downstream of the power nozzle that is located on the centerline 26e of the interaction chamber. By appropriately orienting and scaling these elements, one is able to generate flow vortices behind the island that are swept out of the throat in a manner such that the vortices are alternately proximate the throat's right sidewall and then its left sidewall.
  • a triangular shape has been selected as a first preferred embodiment for this island 34, although other shapes (e.g., circular) are possible. See FIG. 5B.
  • This triangular island is oriented so that one of its intersection points 34a, 34b, 34c faces the oncoming flow from the center power nozzle.
  • the flow patterns at successive instances in this oscillator are shown by the flow streamlines which are superimposed in FIGS.
  • Vortices are seen to be shed from the downstream edges of the triangular island 34. At an instance when these vortices are of approximately the same size, they act to equally block the flow coming from the outer power nozzles so that more liquid flows through the center power nozzle, around the island and exits the oscillator along the direction of the centerline of the oscillator's outlet or throat 30. See FIG. 5 A. Because of instabilities in this flow pattern, the vortices behind the island will not remain symmetric for long. Consequently, a flow pattern like that shown in either FIGS. 6 or 7 may quickly develop in alternating instances. In FIG.
  • FIGS. 5-7 The combination of the flow phenomena seen is FIGS. 5-7 is the sweeping from one side to the other of the flow from the oscillator.
  • the geometry of the oscillator is more compact (i.e., its interaction region 26 is closer to its fluid source inlet 28) and the passageways leading to the two outside power nozzles are smaller in size and thus more restrictive than those for the embodiment of the oscillator shown in FIGS. 5-7.
  • the center power nozzle having a width of 0.48 mm
  • the outside power nozzles have a width of 0.37 mm.
  • FIG. 10 Shown in FIG. 10 is another preferred embodiment for the present invention, h this embodiment, the general geometry of the oscillator 18 is similar to that shown in FIG. 9 and to this embodiment has been added two rows of staggered filter posts 36 which are situated just downstream of the fluid source inlet 28.
  • FIGS . 12A - 12B show the top view and a centerline, side view of the downstream end of a three-jet island oscillator that has a downward sloped floor.
  • Downward tapers 36 or slopes in the range of 10 to 20 degrees have been found to yield relative thick sprays, i.e., the top and bottom edges of such sprays are seen to diverge so as to have included angles in the range of 5 to 15 degrees.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Hydrogenated Pyridines (AREA)

Abstract

L'invention concerne un oscillateur fluidique (2) qui permet, par des températures froides, d'utiliser un liquide pressurisé afin de générer une distribution spatiale uniforme de gouttelettes. Cet oscillateur fluidique comprend : (a) un orifice d'admission (28) destiné au liquide pressurisé ; (b) un jeu de trois injecteurs principaux (24) qui sont alimentés par le liquide pressurisé ; (c) une chambre d'interaction (26) fixée aux injecteurs et recevant le flux issu des injecteurs, cette chambre comprenant une partie amont (26a) et une partie aval (26b), cette partie amont comprenant une paire de bords de délimitation (26c, 26d) et un axe longitudinal (26e) qui se trouve approximativement à distance égale des bords, l'un des injecteurs principaux (24) étant dirigé le long de l'axe longitudinal de la chambre (26e) ; (d) un étranglement (30) par lequel le liquide s'échappe de la chambre d'interaction (26) ; et (e) un îlot (24) situé dans la chambre d'interaction, cet îlot se trouvant en aval de l'injecteur principal (24) qui est dirigé le long de l'axe longitudinal de la chambre (26e).
PCT/US2004/035108 2003-10-21 2004-10-19 Oscillateur fluidique comprenant trois injecteurs et un ilot Ceased WO2005042169A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04796157A EP1675686B1 (fr) 2003-10-21 2004-10-19 Oscillateur fluidique comprenant trois injecteurs et un ilot
DE602004010697T DE602004010697T2 (de) 2003-10-21 2004-10-19 Fluidoszillator mit drei krafteinlassdüsen und einem wirbel erzeugenden hindernis

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US51306803P 2003-10-21 2003-10-21
US60/513,068 2003-10-21

Publications (1)

Publication Number Publication Date
WO2005042169A1 true WO2005042169A1 (fr) 2005-05-12

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Family Applications (1)

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PCT/US2004/035108 Ceased WO2005042169A1 (fr) 2003-10-21 2004-10-19 Oscillateur fluidique comprenant trois injecteurs et un ilot

Country Status (4)

Country Link
EP (1) EP1675686B1 (fr)
AT (1) ATE380596T1 (fr)
DE (1) DE602004010697T2 (fr)
WO (1) WO2005042169A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006049622A1 (fr) * 2004-11-01 2006-05-11 Bowles Fluidics Corporation Oscillateur fluidique a performance de refroidissement amelioree
WO2007035767A1 (fr) 2005-09-20 2007-03-29 Bowles Fluidics Corporation Oscillateur fluidique ameliore pour applications par vaporisation epaisse/en trois dimensions
WO2010101646A3 (fr) * 2009-03-03 2010-12-02 Bowles Fluidics Corporation Oscillateur fluidique à gorges multiples de grande efficacité
JP2017064393A (ja) * 2015-09-30 2017-04-06 Toto株式会社 吐水装置
WO2017057327A1 (fr) * 2015-09-30 2017-04-06 Toto株式会社 Dispositif de décharge d'eau
JP2017064394A (ja) * 2016-09-14 2017-04-06 Toto株式会社 吐水装置
JP2018110780A (ja) * 2017-01-13 2018-07-19 Toto株式会社 吐水装置
JP2019112845A (ja) * 2017-12-25 2019-07-11 Toto株式会社 吐水装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102688817A (zh) * 2011-03-22 2012-09-26 厦门松霖科技有限公司 出高频脉冲水的装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052002A (en) * 1974-09-30 1977-10-04 Bowles Fluidics Corporation Controlled fluid dispersal techniques
US6186409B1 (en) * 1998-12-10 2001-02-13 Bowles Fluidics Corporation Nozzles with integrated or built-in filters and method
CZ12485U1 (cs) * 2002-06-25 2002-07-24 Hydrosystem Group, A.S. Fluidická tryska

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4052002A (en) * 1974-09-30 1977-10-04 Bowles Fluidics Corporation Controlled fluid dispersal techniques
US6186409B1 (en) * 1998-12-10 2001-02-13 Bowles Fluidics Corporation Nozzles with integrated or built-in filters and method
CZ12485U1 (cs) * 2002-06-25 2002-07-24 Hydrosystem Group, A.S. Fluidická tryska
DE10324494A1 (de) * 2002-06-25 2004-04-08 Hydrosystem Project A.S. Fluiddüse

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006049622A1 (fr) * 2004-11-01 2006-05-11 Bowles Fluidics Corporation Oscillateur fluidique a performance de refroidissement amelioree
WO2007035767A1 (fr) 2005-09-20 2007-03-29 Bowles Fluidics Corporation Oscillateur fluidique ameliore pour applications par vaporisation epaisse/en trois dimensions
WO2010101646A3 (fr) * 2009-03-03 2010-12-02 Bowles Fluidics Corporation Oscillateur fluidique à gorges multiples de grande efficacité
JP2017064393A (ja) * 2015-09-30 2017-04-06 Toto株式会社 吐水装置
WO2017057327A1 (fr) * 2015-09-30 2017-04-06 Toto株式会社 Dispositif de décharge d'eau
US10427175B2 (en) 2015-09-30 2019-10-01 Toto Ltd. Spout apparatus causing reciprocal oscillations
JP2017064394A (ja) * 2016-09-14 2017-04-06 Toto株式会社 吐水装置
JP2018110780A (ja) * 2017-01-13 2018-07-19 Toto株式会社 吐水装置
JP2019112845A (ja) * 2017-12-25 2019-07-11 Toto株式会社 吐水装置

Also Published As

Publication number Publication date
DE602004010697T2 (de) 2008-12-04
EP1675686B1 (fr) 2007-12-12
ATE380596T1 (de) 2007-12-15
DE602004010697D1 (de) 2008-01-24
EP1675686A1 (fr) 2006-07-05

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