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
  • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
  • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
  • F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
  • F02M61/1853—Orifice plates

Definitions

• the invention relates to a valve for atomizing a fluid, in particular injection and / or metering valve for fuel injection or exhaust systems in internal combustion engines, according to the preamble of claim 1.
• the arranged on a dividing circle injection holes all have the same shape, the contour of triangular, truncated triangular, semicircular, cut off semicircular, semi-elliptical, cut off semi-elliptical, rounded truncated triangular, semicircular or semi-elliptical with rounded edges or similar. All spray hole shapes are contoured so that a taper of the injection hole on the opposite side of the inflow side, ie radially outward, is present.
• the inventive valve with the features of claim 1 has the advantage of a cost-effective and reproducible producible spray perforated disc with improved atomization of the sprayed fluid, e.g. of fuel or urea water solutions.
• the spray orifice plate is for mass production from a non-corrosive material, e.g. stainless steel, suitable, the cycle times for embossing the wells and fine punches of the injection holes can be kept small.
• Spray hole length are shortened so far that the spray hole flow for ideal atomization fanned out sufficiently well from each spray hole can escape, so the flow outlet vectors are not bundled in parallel in the injection hole.
• the at least one injection hole in the recess near the wall facing away from the valve opening wall of the recess is arranged, wherein the base of the recess is greater by a multiple than the cross section of the at least one injection hole.
• a transverse vortex system with vortex axes parallel to the vertical axis of the spray perforated disk arises in the flow catchment area of the injection hole within the depression.
• This transverse vortex system supports the fanning out of the fluid jet emerging from the respective spray hole by means of flow rotation.
• the at least one recess has a circular, oval or elliptical cross section. By such a cross-sectional shape, the transverse vortex system can be selectively influenced.
• the at least one spray hole can be punched vertically or obliquely to the disk surface, wherein the skew to the disk center extends.
• a maximum flow deflection takes place from the depression into the injection hole, whereby a two-phase region (fluid, air) is generated in the injection hole in the extreme case.
• the liquid is pressed by the deflection forces on that part of the spray hole wall which is opposite to the upstream side of the spray hole. Due to the deflection forces pressing on the spray-hole wall, the fluid flow is pressed along the spray-hole wall.
• the fluid flow is deformed in its cross section to a sickle which bears against the injection hole wall on one side and is fanned out along the spray hole circumference.
• a fanning-out fluid lamella with improved atomization emerges from the injection hole.
• the injection holes are placed in the at least one depression such that the flow vectors of the fuel spray emerging from the injection holes diverge so that the fluid compartments emerging from the injection holes do not meet.
• FIG. 1 shows a detail of a longitudinal section of a valve for atomizing fluid
• FIG. 2 is a plan view of a spray perforated disk in the valve of FIG. 1,
• FIG. 3 is an enlarged view of a bottom view of the section III in Fig. 2,
• FIG. 4 shows a similar view as in FIG. 1 with a modified spray perforated disk
• FIG. 5 is a plan view of the spray perforated disk in Fig. 4,
• FIG. 6 is an enlarged view of a bottom view of the section IV in Fig. 5,
• Fig. 7 is a plan view of another modified spray perforated disk.
• valve shown partially in longitudinal section in FIG. 1 with its ejection-side end serves for the metered injection and atomization of fluid, e.g. of fuel in fuel injection systems of internal combustion engines or of urea-water solutions in exhaust systems of internal combustion engines for the reduction of nitrogen oxides contained in the exhaust gas.
• fluid e.g. of fuel in fuel injection systems of internal combustion engines or of urea-water solutions in exhaust systems of internal combustion engines for the reduction of nitrogen oxides contained in the exhaust gas.
• the valve has a tubular valve seat carrier 11 whose discharge-side end is closed by a valve seat body 12.
• the valve seat body 12 is inserted into the end of the valve seat carrier 11 and with this material fit, e.g. by welding, connected.
• the valve seat body 12 has a valve opening 13, which from a on
• Valve seat body 12 trained valve seat 14 is enclosed.
• an actuator e.g. an electromagnet, actuated valve needle 15 which carries at its end a spherical valve closing body 16.
• the valve-closing body 16 is pressed onto the valve seat 14 via a valve-closing spring which loads the valve needle 15 and is not lifted off from the valve seat 14 when the actuator is activated against the spring force of the valve-closing spring.
• the size of the stroke of the valve closing body 16 and the time of release of the valve opening 13 by the valve closing body 16 determines the amount of fluid exiting via the valve opening 13.
• the valve seat body 12 downstream of the valve opening 13 is provided a spray perforated disk 17 which is preferably cohesively, for example by welding, attached to the end face of the valve seat body 12.
• the corrosion-resistant material, eg stainless steel, existing spray perforated disk 17 is provided depending on the required spray pattern with one or more spray holes 18, which are connected via a Anströmhohlraum 19 with the valve port 13 in conjunction.
• the Anströmhohlraum 19 consists of at least one of the disc surface 171, which faces the valve seat body 12, her introduced recess 20 in the spray disk 17.
• the wells 20 are arranged offset on a concentric divider circle by the same circumferential angle against each other.
• the recesses 20 are preferably embossed into the spray perforated disk 17 and have a circular, oval or elliptical shape.
• the bottom 201 of the depression can be concave (FIG. 1) or planar (FIG. 4), the bottom surface of the bottom 201 being many times greater than the cross section of the at least one injection hole 18 introduced into the bottom 201 of the depression 20.
• the depressions 20 are arranged in the spray perforated disk 17, that a part of each recess 20 protrudes into the valve opening 13, the valve opening 13 virtually underflows, and the remaining part of the recess 20, in which the at least one injection hole 18 is located, from the End face 121 of the valve seat body 12 is covered.
• the injection hole 18 is disposed near the wall of the recess 20 facing away from the valve opening 13.
• a transverse vortex system with a vortex axis parallel to the vertical axis of the spray perforated disk 17 is created in the flow catchment area of the injection hole 18.
• This transverse vortex system supports the fanning of the fluid jet emerging from the spray hole 18 by means of flow rotation.
• the transverse vortex system can be influenced in a targeted manner by the form of the recess 20 already mentioned above.
• the injection hole 18 can be made with various cross-sectional shapes, such as round, elliptical, oval or polygonal.
• the spray hole axes of the spray holes 18 may be in any direction to the disk surface.
• the injection holes are punched perpendicular to the disk surface.
• the injection holes 18 are punched obliquely to the disk surface, wherein they are inclined at an acute angle to the disk surface to the disk center. In both cases, due to the deflection forces arising in the flow deflection from the depression 20 into the spray hole 18, the fluid is pressed against that part of the spray hole wall which lies opposite the inflow side of the spray hole 18. The rest of the spray hole 18 is filled with air.
• the embodiment of the valve shown in longitudinal section in Fig. 4 differs from the embodiment described above only by the already mentioned modifications of the spray perforated disk 17.
• the recess 20 is not trough-like with concave bottom 201 as in Fig. 1, but cylindrical with a flat Bottom 201 embossed in the spray perforated disk 17.
• the spray holes 18 are punched obliquely so that the spray hole axes are inclined at an acute angle to the disk surface towards the disk center.
• FIG. 7 another embodiment of the spray perforated disk 17 20 two injection holes 18 are present in each of two arranged in the spray hole 17 recesses 20 which are punched obliquely in the embodiment of FIG. 7 as in Fig. 4 to the disk surface.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Fuel-Injection Apparatus (AREA)
• Exhaust Gas After Treatment (AREA)
• Nozzles (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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ID=41334525

Family Applications (1)

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Cited By (1)

Families Citing this family (20)

Citations (5)

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• 2008
  • 2008-09-15 DE DE102008042116.2A patent/DE102008042116B4/de not_active Expired - Fee Related
• 2009
  • 2009-09-02 JP JP2011526465A patent/JP2012503128A/ja active Pending
  • 2009-09-02 WO PCT/EP2009/061320 patent/WO2010028987A1/de not_active Ceased
  • 2009-09-02 US US13/063,234 patent/US8714465B2/en active Active
  • 2009-09-02 CN CN2009801361150A patent/CN102159827A/zh active Pending
• 2013
  • 2013-10-10 JP JP2013213113A patent/JP5901600B2/ja not_active Expired - Fee Related

Patent Citations (5)

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