EP1588046A1 - Soupape d'injection munie d'un revetement empechant la corrosion et resistant a l'usure, et son procede de production - Google Patents

Soupape d'injection munie d'un revetement empechant la corrosion et resistant a l'usure, et son procede de production

Info

Publication number
EP1588046A1
EP1588046A1 EP03750313A EP03750313A EP1588046A1 EP 1588046 A1 EP1588046 A1 EP 1588046A1 EP 03750313 A EP03750313 A EP 03750313A EP 03750313 A EP03750313 A EP 03750313A EP 1588046 A1 EP1588046 A1 EP 1588046A1
Authority
EP
European Patent Office
Prior art keywords
valve
corrosion
inhibiting
injection valve
friction
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.)
Withdrawn
Application number
EP03750313A
Other languages
German (de)
English (en)
Inventor
Frank Miller
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1588046A1 publication Critical patent/EP1588046A1/fr
Withdrawn legal-status Critical Current

Links

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
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3013—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being a lift valve
    • B05B1/302—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the controlling element being a lift valve with a ball-shaped valve member
    • 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
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • 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
    • F02M61/166—Selection of particular materials
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/02—Fuel-injection apparatus having means for reducing wear
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/90—Selection of particular materials
    • F02M2200/9038—Coatings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/04—O-ring
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/90—Electromagnetically actuated fuel injector having ball and seat type valve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49405—Valve or choke making

Definitions

  • the invention relates to an injection valve according to the preamble of claim 1 and claim 9 and to a method for producing an injection valve according to the preamble of claim 11.
  • the membrane forming the electrolyte must be in the Operation must be kept moist at all times. If the moisture drops below a certain value, the ion conductivity of the membrane drops. In order to keep the moisture of the membrane of the fuel cell at a certain optimal level, deionized water is often metered into the gas stream supplied.
  • PEM-FC Proton Exchange Membrane Fuel Cell
  • a device for humidifying the gas stream which admixes water to the gas stream via a simple nozzle protruding into the gas stream.
  • water should be metered into the gas stream as precisely as possible over a wide metering range, largely independently of the water pump pressure, and should be adjustable, cost-effective and reliable using several parameters. It is therefore advantageous to use, for example, fuel injectors for metering in water, which are already known from reciprocating piston machines with internal combustion.
  • Such a valve is e.g. B. from the publication DE 196 265 76 AI known.
  • a related application is the exact metering of an aqueous urea / water solution to reduce the nitrogen oxides in the exhaust system of diesel vehicles for exhaust gas aftertreatment or in the case of generally non-lubricatable media.
  • Petrol own lubricating properties and do not inhibit chemical corrosion or promote chemical corrosion, especially on metallic surfaces, itself.
  • Water on the other hand, has no own lubricating properties and favors chemical corrosion on metallic surfaces, especially on ferrous metal surfaces. Such iron-containing metallic surfaces frequently come into contact with the liquid to be injected in the named fuel injection valve.
  • the known fuel injector is designed for use in higher temperature ranges, for example above 100 ° C.
  • metallic materials were used in the valve sealing seat, which have good thermal resistance.
  • thermally resistant material e.g. ferrous metal
  • thermally resistant metals increase the forces that occur in the valve opening and closing processes in the sealing seat or in the force-transmitting components.
  • the injection valve according to the invention with the characterizing features of claim 1 has various advantages.
  • the surfaces that come into contact with water and are provided with a corrosion-inhibiting or friction-reducing layer are effectively and long-lasting protected against chemical or mechanical corrosion, in particular through chemical corrosion and frictional wear.
  • the corrosion-inhibiting and / or friction-reducing layer consists of several layers or layers.
  • the properties of several coating materials can be combined.
  • a waterproof underlayer that adheres well to metal can be combined with a friction-reducing top layer.
  • the injection valve has a swirl-generating device, the water can be injected into the gas stream with swirl. This leads to a better distribution of the injected water in the gas stream.
  • the joint connections coming into contact with water, in particular the weld seams, with the corrosion-inhibiting or friction-reducing layer coated also leads to an increased service life and reliability of the injection valve.
  • the coating of the guide and sliding surfaces of the fuel injector, which come into contact with water, also leads to a particularly long service life and reliability.
  • the corrosion-inhibiting or friction-reducing layer By applying the corrosion-inhibiting or friction-reducing layer by means of a galvanic, physical or chemical process, different properties of the coating material and the surface to be coated can be addressed. Likewise, by selecting the material forming the corrosion-inhibiting or friction-reducing layer, different properties of the material to be coated or the intended properties of the coated surface can be dealt with.
  • the elastic sealing ring relieves the forces in the sealing seat or the components that are operatively connected to it. This leads to increased durability and reliability of the injection valve. It is particularly advantageous to use a sealing ring that is at least partially made of an elastomer.
  • the inventive method with the features of claim 11 has the advantage that it can be used to produce an injection valve with which the aforementioned advantages can be achieved in a simple and therefore inexpensive manner.
  • the aftertreatment in the form of a centrifugation of the joined components ensures a special complete coating, since in this way in particular the material forming the coating penetrates into the smallest spaces, for example the welded connection. Due to the thermal treatment, the corrosion-inhibiting or friction-reducing layer is bonded particularly well and permanently to the respective surface.
  • FIG. 1 shows a schematic section through an exemplary embodiment of an injection valve according to the invention
  • FIG. 2 shows a schematic partial section of another exemplary embodiment of an injection valve according to the invention in the region of the valve seat body, similar to the exemplary embodiment of FIG. 1, but with an elastic sealing ring in the valve closing body,
  • Fig. 3 is a schematic partial section through a valve closing body and a valve needle with the cannula and positioned 4 shows a schematic partial section of a further exemplary embodiment in the area of the valve needle, the valve closing body and the armature.
  • An injection valve 1 shown in FIG. 1 is used in particular for injecting water into the gas stream of a fuel cell, not shown.
  • the injection valve 1 comprises a core 2, which is surrounded by a magnet coil 4 and serves as an inlet connection piece, which for example is tubular here and has a constant outer diameter over its entire length; it can also be designed in a stepped manner.
  • a tubular metallic intermediate part 12 is tightly connected, for example by welding, concentrically to a longitudinal valve axis 10 and thereby partially surrounds the core end 9 axially.
  • the stepped coil body 3 partially overlaps the core 2 and, with a step 15 of larger diameter, the intermediate part 12 at least partially axially.
  • a tubular nozzle body 16 extends downstream of the bobbin 3 and the intermediate part 12 and is, for example, firmly connected to the intermediate part 12.
  • a longitudinal bore 17 runs in the nozzle body 16 and is formed concentrically with the longitudinal axis 10 of the valve.
  • a tubular valve needle 19 is arranged, which is spherical at its downstream end Valve closing body 21, on the circumference of which, for example, 5 flattenings 22 are provided, is connected by at least one third weld seam 31 shown in FIG. 3.
  • the injection valve 1 is actuated in a known manner, in this exemplary embodiment electromagnetically.
  • the electromagnetic circuit with the magnet coil 4 the core 2 and an armature 27 is used.
  • the hollow cylindrical armature 27 comprises the upstream end of the valve needle 19 and is non-positively connected to it by a first weld 28.
  • a cylindrical valve seat body 29 which has a valve seat surface 20, is tightly mounted in the longitudinal bore 17 by a second weld seam 30.
  • the valve closing body 21 interacts with the valve seat surface 20 formed on the valve seat body 29 to form a sealing seat.
  • a guide opening 11 of the valve seat body 29 is used to guide the valve closing body 21 during the axial movement of the valve needle 19 with the armature 27 along the valve longitudinal axis 10.
  • the nozzle body 16 On its end face facing away from the valve closing body 21, the nozzle body 16 is concentric and fixed with a, for example, cup-shaped injection orifice plate 8 fourth weld 34 connected.
  • the spray plate 8 has at least one, but here four spray openings 7 for spraying water or deionized water into a gas stream of a fuel cell, not shown.
  • the weld seams 28, 30, 31, 34 are coated with a corrosion-inhibiting and / or friction-reducing layer.
  • the insertion depth of the valve seat body 29 with the cup-shaped spray perforated disk 8 determines the presetting of the stroke of the valve needle 19.
  • the one end position of the valve needle 19 when the magnet coil 1 is not energized is determined by the contact of the valve closing body 21, while the other end position of the valve needle 19 when the magnet coil 4 is energized results from the contact of the armature 27 at the core end 9.
  • the injection valve 1 is largely enclosed by a plastic encapsulation 23, which extends from the core 2 in the axial direction via the magnet coil 4 to the nozzle body 16.
  • this plastic encapsulation 23 includes a molded connector plug 26.
  • a filter 18 protrudes into the upstream end of the flow bore 6 of the core 2 and provides for the filtering out of components which can lead to malfunctions or damage in the injection valve 1.
  • At least a part of the surfaces of the injection valve 1 coming into contact with water in particular the inner surfaces of the longitudinal bore 17, the guide bore 11 and the flow bore 6, as well as the surfaces of the adjusting sleeve 5, the valve needle 19, the valve seat surface 20 and the valve closing body 21 are with a corrosion-inhibiting and / or friction-reducing layer 33 (in Fig. 3) coated.
  • FIG. 2 shows a schematic partial section of a further exemplary embodiment according to the invention in the area of the Valve closing body 21.
  • the valve closing body 21 with the flats 22 lies sealingly on the valve seat surface 20 of the valve seat body 29 via an elastic sealing ring 14, which lies in a groove 13 partially recessed in a ring in the lower spray-side area of the valve closing body 21.
  • the valve seat surface 20 and / or the valve closing body 21 can be provided with a corrosion-inhibiting or, in particular, for damping forces that occur when the valve is actuated and thus for a long-lasting seal. wear-reducing layer (33 in Fig. 3) are coated.
  • FIG. 3 shows a cannula 24 belonging to a metering device (not shown further).
  • the cannula 24 is chamfered at its end facing the valve closing body 21.
  • the metering device is delivered to the components joined and positioned by the third weld seam 31.
  • the material of the corrosion-inhibiting and / or friction-reducing layer 33 would be added in the interior of the valve needle 19 and the valve closing body 21, the cannula 24 or the components being able to be rotated about its longitudinal axis in the process for better distribution of the material.
  • the layer 33 is applied from the outside.
  • valve needle 19 is made of a corrosion-resistant material such as stainless steel.
  • the valve needle 19 can also be coated with the layer 33.
  • the corrosion-inhibiting and / or friction-reducing layer 33 is applied, for example, by a galvanic process.
  • other physical or chemical methods in particular a physical vapor deposition method or a chemical vapor deposition method, are also suitable, for example, for applying the layer 33.
  • the corrosion-inhibiting and / or friction-reducing layer 33 consists of a lubricating lacquer Teflon-based, made from sulfur-based materials, in particular molybdenum sulfite MoS 2 made from carbon, from xylan, from titanium nitride TiN and / or from carbon mixtures, in particular PTEE.
  • the layer 33, with which the valve needle 19 and the valve closing body 21 are protected, are centrifuged in the manufacturing process, for example after the application of the substances forming the layer 33, the valve needle 19 and the valve closing body 21 having already been joined and the valve needle 19 lying inside during centrifugation and the valve closing body 21 is on the outside.
  • a very uniform layer 33 can be produced in this way.
  • the invention is not limited to the illustrated embodiment and e.g. Can be used for any type of injection valve 1, in particular also for outward opening injection valves or for injection valves with piezoelectric, magnetostrictive or electrostrictive actuator. It is particularly suitable only for the injection of water, especially aggressive deionized water.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

L'invention concerne une soupape d'injection (1) pour l'injection d'eau, notamment dans le courant gazeux de piles à combustible. La soupape d'injection selon l'invention comprend un pointeau de soupape (19) à l'extrémité côté pulvérisation duquel est monté un corps de fermeture de soupape (21) qui coopère avec une surface de siège de soupape (20), réalisée sur un corps de siège de soupape (29), afin de former un siège d'étanchéité. Un orifice de pulvérisation (7) est réalisé en aval du siège d'étanchéité, au moins une partie des surfaces de la soupape d'injection (1) qui entrent en contact avec l'eau étant revêtue d'une couche (33) empêchant la corrosion ou diminuant la friction.
EP03750313A 2002-10-04 2003-09-03 Soupape d'injection munie d'un revetement empechant la corrosion et resistant a l'usure, et son procede de production Withdrawn EP1588046A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10246230 2002-10-04
DE10246230A DE10246230A1 (de) 2002-10-04 2002-10-04 Einspritzventil und Verfahren zu dessen Herstellung
PCT/DE2003/002919 WO2004033895A1 (fr) 2002-10-04 2003-09-03 Soupape d'injection munie d'un revetement empechant la corrosion et resistant a l'usure, et son procede de production

Publications (1)

Publication Number Publication Date
EP1588046A1 true EP1588046A1 (fr) 2005-10-26

Family

ID=32049194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03750313A Withdrawn EP1588046A1 (fr) 2002-10-04 2003-09-03 Soupape d'injection munie d'un revetement empechant la corrosion et resistant a l'usure, et son procede de production

Country Status (5)

Country Link
US (2) US7506826B2 (fr)
EP (1) EP1588046A1 (fr)
JP (1) JP2006502352A (fr)
DE (1) DE10246230A1 (fr)
WO (1) WO2004033895A1 (fr)

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JP2006502352A (ja) 2006-01-19
US7506826B2 (en) 2009-03-24
US20060202049A1 (en) 2006-09-14
US20090144982A1 (en) 2009-06-11
DE10246230A1 (de) 2004-04-29
WO2004033895A1 (fr) 2004-04-22

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