EP2029887A1 - Sprüheinrichtung für fluide - Google Patents
Sprüheinrichtung für fluideInfo
- Publication number
- EP2029887A1 EP2029887A1 EP07727969A EP07727969A EP2029887A1 EP 2029887 A1 EP2029887 A1 EP 2029887A1 EP 07727969 A EP07727969 A EP 07727969A EP 07727969 A EP07727969 A EP 07727969A EP 2029887 A1 EP2029887 A1 EP 2029887A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hifu
- actuator
- shock wave
- spraying device
- nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 25
- 239000007921 spray Substances 0.000 title claims abstract description 13
- 230000035939 shock Effects 0.000 claims abstract description 66
- 230000001105 regulatory effect Effects 0.000 claims abstract 2
- 238000005507 spraying Methods 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 239000000446 fuel Substances 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims 1
- 238000013461 design Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 239000000443 aerosol Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000006193 liquid solution Substances 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
- F02M69/04—Injectors peculiar thereto
- F02M69/041—Injectors peculiar thereto having vibrating means for atomizing the fuel, e.g. with sonic or ultrasonic vibrations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means
Definitions
- the invention relates to a spraying device for fluids according to the preamble of claim 1.
- DE 198 07 240 A1 describes an injection system for liquid fuels, in particular for an oil burner, which comprises a delivery pump, a fluid accumulator and an injection nozzle as well as pressure relief valves.
- the feed pump removes the liquid fuel from the fluid reservoir and promotes this to the injection nozzle, the pressure relief valves prevent an unacceptably high increase in the system pressure.
- the injection duration is varied.
- additional hydraulic components are provided which enable pulsating operation. By means of a fast-opening and closing solenoid valve pressure pulsations are generated whose frequency and pulse duration determine the fuel quantity to be injected.
- the invention has for its object to provide a simple spraying means for fluids with simple design measures, which is characterized by a reduced energy consumption at the same time small drop size.
- the fluid spraying device is provided with a shock wave actuator, over which shock waves are generated in the spray device, which are conducted to the fluid located in the nozzle.
- the physical phenomenon of the shock wave is a strong pressure wave in elastic media, such as liquids, which propagate at supersonic speeds, with high mechanical stresses and pressures in the shock front of the shock wave.
- the shock wave represents a pressure pulse in which within a fraction of a second, the pressure rises steeply and then falls steeply again.
- the extreme pressure change produced by the pressure wave is exploited in the spray generation device according to the invention by directing the shock wave energy to a focusing point at which the droplet formation takes place.
- the advantage of this approach is that the system mean pressure in the fluid can be kept relatively low and yet a mist with very small droplet size can be generated since the energy required for droplet formation results from the shockwave and not from the system pressure. Compared to prior art embodiments, this overall energy savings and a simplification of design is achieved, which in particular results from the use of the low pressure system instead of a conventional high pressure system.
- the shock wave can be directed to a specific focusing point, which is usually located at the nozzle exit, where the exiting spray is generated.
- the fluid is accelerated at the focussing point to supersonic speed, so that for a drop size distribution with preferably small drops optimal boundary conditions.
- shock wave can be generated at a distance from the focusing sierddling at a favorable position in terms of constructive position in the spray, in particular in the housing of the nozzle at a distance from the nozzle exit.
- a concave-shaped wall section of the nozzle housing may be considered as the shockwave actuator, the concave shape assisting the targeted propagation of the shockwave in the direction of the focusing point.
- the propagation from the position of the shock wave actuator in the nozzle housing to the focusing point takes place via the fluid in the nozzle as a shaft carrier.
- the generation of the shock waves preferably takes place with the aid of a piezo element or a piezocomposite element which, for example, forms a wall section in the housing wall of the nozzle.
- a piezo element or a piezocomposite element which, for example, forms a wall section in the housing wall of the nozzle.
- at least two shockwave actuators are provided whose shockwaves intersect at the desired focusing point.
- shock wave actuators which operate according to an electrohydraulic principle (radio discharge path) or according to an electrical / mechanical force conversion principle.
- shock wave As an alternative to the shock wave principle, it is also possible to use piezo or piezocomposite elements or other fast actuators which operate on the HIFU principle (High Intensity Focused Ultrasound).
- the shock wave is replaced by a high-frequency ultrasound source.
- the focus on the nozzle outlet can be carried out both directly and indirectly.
- the shock wave propagation occurs directly between the shock wave actuator and the focusing point, with indirect propagation the shock wave is first reflected on at least one reflecting surface and then directed further in the direction of the focusing point.
- the advantage of the indirect Propagation is in the greater structural design options for the arrangement of the shock wave actuator, so that, for example, very narrow-built sprayers can be realized.
- the mass dosage per injection process is determined by the number of successive shock wave pulses.
- Said spraying device can be used in various products.
- all types of injection systems in particular injection systems in internal combustion engines such as diesel vehicles or gasoline vehicles, but also, for example, the injection of liquid solutions in the exhaust system of an internal combustion engine as exhaust aftertreatment (Ammoniakeindüsung).
- Ammoniakeindüsung the injection of liquid solutions in the exhaust system of an internal combustion engine as exhaust aftertreatment
- novel gasifier concepts in which such spraying can be used.
- FIG. 1 shows a section through a spraying device with a nozzle having concave walls, which are designed as piezoelectric elements for generating shock waves, wherein the shock waves are directed to the nozzle outlet for generating a spray,
- Fig. 2 is a spraying device in an alternative embodiment, in which the
- Shock waves are first reflected on reflection surfaces that the Limit the interior of the nozzle and then direct it to the focusing point at the nozzle exit.
- the spraying device 1 shown in FIG. 1 is, for example, a fuel injection system for internal combustion engines.
- the spraying device 1 comprises a nozzle 2, which is connected via a feed device 5, are introduced into the inlet bores 6, with a fluid reservoir 3.
- the fluid in the fluid reservoir 3 is pressurized via a pressure generating unit 4 - exemplified as a pump P - which is in particular only a low pressure.
- the nozzle housing 9 is funnel-shaped in the embodiment, at the tip of the nozzle housing is a nozzle outlet 8, which is to be opened and closed by an actuator designed as a valve needle 7.
- the valve needle 7 is guided axially displaceable and mounted in the inlet device 5.
- the valve needle 7 is adjusted between its open and closed positions. The adjusting movement of the valve needle 7 takes place along the valve needle longitudinal axis 12 and is generated by means of a suitable actuator.
- shock waves are generated in the nozzle, which focus on the nozzle outlet 8 and transfer the shock wave energy at the nozzle exit to the fuel located there, whereby fine fuel droplets emerge, which emerge through the nozzle exit from the nozzle housing 9 and a Form fuel mist.
- the shock waves are generated by shock wave actuators 10 and 11, which form part of the nozzle outlet 8 opposite wall of the nozzle housing 9.
- the shock wave actuators 10 and 11 are, for example, piezo elements which change their shape when an electrical voltage is applied, wherein the deformation Operation takes place within very small time periods.
- shock wave actuators 10 and 11 are concave shaped in the manner of a concave mirror, such that the focal point is in the nozzle outlet 8.
- actuators which operate according to the electrohydraulic principle or according to another electrical / mechanical force conversion principle or the HIFU principle.
- the shock waves run directly from the place of their generation, ie the shock wave actuators 10 and 11, without deflection or reflection to sierddling the nozzle exit 8.
- An alternative embodiment is shown in Fig. 2, where the dashed lines shown shock waves 13 and 14, which mark the maximum radiation angle range, not directly, but are directed by multiple reflection from the place of their formation on the shock wave actuator 10 to the focusing point at the nozzle exit 8.
- the shock wave actuator 10 is not directly opposite the nozzle outlet 8, but is located in a laterally located wall in the nozzle housing 9 in a position without direct connection to the nozzle outlet. This arrangement has the advantage of a narrow construction.
- the shock waves are deflected to reflection surfaces 15 and 16, which are inner walls of the nozzle housing delimiting the nozzle interior.
- reflection surfaces 15 and 16 are provided, at which the shock waves 13 and 14 radiated from the shock wave actuator 10 are reflected, wherein the shock waves of the radiation beam generated by the shock wave actuator 10 same shockwave actuator strike different reflection surfaces. Due to the multiple deflection of the shock waves are basically greater constructive degrees of freedom with regard to the positioning of the shock wave actuators and overall in the structural design of the spray 1.
- shock wave actuators whose shock waves, depending on the radiation angle, are directed both directly to the focussing point and also indirectly to the focussing point via a simple or multiple deflection on reflection surfaces.
- the shock waves are expediently generated repeatedly per injection process, in particular generated at high frequency.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Nozzles (AREA)
- Special Spraying Apparatus (AREA)
- Nozzles For Spraying Of Liquid Fuel (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006026153A DE102006026153A1 (de) | 2006-06-06 | 2006-06-06 | Sprüheinrichtung für Fluide |
PCT/EP2007/053501 WO2007141071A1 (de) | 2006-06-06 | 2007-04-11 | Sprüheinrichtung für fluide |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2029887A1 true EP2029887A1 (de) | 2009-03-04 |
EP2029887B1 EP2029887B1 (de) | 2012-02-22 |
Family
ID=38326140
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07727969A Not-in-force EP2029887B1 (de) | 2006-06-06 | 2007-04-11 | Sprüheinrichtung für fluide |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090302131A1 (de) |
EP (1) | EP2029887B1 (de) |
JP (1) | JP2009540176A (de) |
AT (1) | ATE546638T1 (de) |
DE (1) | DE102006026153A1 (de) |
WO (1) | WO2007141071A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008000760A1 (de) * | 2008-03-19 | 2009-09-24 | Robert Bosch Gmbh | Bauelementpaarung sowie Vorrichtung mit Bauelementpaarung |
DE102008042850A1 (de) | 2008-10-15 | 2010-04-22 | Robert Bosch Gmbh | Einspritzvorrichtung |
DE102009055042A1 (de) | 2009-12-21 | 2011-06-22 | Robert Bosch GmbH, 70469 | Einspritzventil |
DE102010062388A1 (de) * | 2010-12-03 | 2012-06-06 | Robert Bosch Gmbh | Elektromagnetisches Aktormodul und Einspritzventil |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2264191A2 (en) * | 1972-02-01 | 1975-10-10 | Plessey Handel Investment Ag | Engine fuel injector system - fuel pressure used to close injector nozzle check valve when not vibrated |
US4930700A (en) * | 1986-08-27 | 1990-06-05 | Atochem North America | Ultrasonic dispersion nozzle having internal shut-off mechanism with barrier fluid separation |
DE4127455A1 (de) * | 1991-08-20 | 1993-02-25 | Uwegas Gmbh | Elektromagnetisch gesteuertes pumpe-duese-element mit integrierter zuendeinrichtung |
US5866971A (en) * | 1993-09-09 | 1999-02-02 | Active Control Experts, Inc. | Hybrid motor |
US5437255A (en) * | 1994-03-15 | 1995-08-01 | Sadley; Mark L. | Fuel injection sytem employing solid-state injectors for liquid fueled combustion engines |
AU694353B2 (en) * | 1995-04-28 | 1998-07-16 | Ficht Gmbh & Co. Kg | Fuel injection device for internal combustion engines |
JPH10103176A (ja) * | 1996-09-26 | 1998-04-21 | Yamaha Motor Co Ltd | 液体噴射装置 |
JP3369418B2 (ja) * | 1996-11-25 | 2003-01-20 | 大日本スクリーン製造株式会社 | 超音波振動子、超音波洗浄ノズル、超音波洗浄装置、基板洗浄装置、基板洗浄処理システムおよび超音波洗浄ノズル製造方法 |
FR2762648B1 (fr) * | 1997-04-25 | 1999-06-04 | Renault | Dispositif d'injection de carburant pour moteur a combustion interne |
DE19918423A1 (de) * | 1999-04-23 | 2000-10-26 | Denys F Hackert | Einspritzanlage für flüssige Medien |
US6883729B2 (en) * | 2003-06-03 | 2005-04-26 | Archimedes Technology Group, Inc. | High frequency ultrasonic nebulizer for hot liquids |
JP2005058933A (ja) * | 2003-08-18 | 2005-03-10 | Ngk Insulators Ltd | 液体噴射装置 |
-
2006
- 2006-06-06 DE DE102006026153A patent/DE102006026153A1/de not_active Withdrawn
-
2007
- 2007-04-11 JP JP2009513617A patent/JP2009540176A/ja active Pending
- 2007-04-11 US US12/227,303 patent/US20090302131A1/en not_active Abandoned
- 2007-04-11 AT AT07727969T patent/ATE546638T1/de active
- 2007-04-11 EP EP07727969A patent/EP2029887B1/de not_active Not-in-force
- 2007-04-11 WO PCT/EP2007/053501 patent/WO2007141071A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007141071A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2009540176A (ja) | 2009-11-19 |
US20090302131A1 (en) | 2009-12-10 |
ATE546638T1 (de) | 2012-03-15 |
EP2029887B1 (de) | 2012-02-22 |
DE102006026153A1 (de) | 2007-12-13 |
WO2007141071A1 (de) | 2007-12-13 |
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