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WO2025131354A1 - Injecteur pour injecter un milieu gazeux - Google Patents

Injecteur pour injecter un milieu gazeux Download PDF

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Publication number
WO2025131354A1
WO2025131354A1 PCT/EP2024/075886 EP2024075886W WO2025131354A1 WO 2025131354 A1 WO2025131354 A1 WO 2025131354A1 EP 2024075886 W EP2024075886 W EP 2024075886W WO 2025131354 A1 WO2025131354 A1 WO 2025131354A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
insert part
closing element
valve closing
injector
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.)
Pending
Application number
PCT/EP2024/075886
Other languages
German (de)
English (en)
Inventor
Michael Lippisch
Torsten BUROCK
Oezguer Tuerker
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 WO2025131354A1 publication Critical patent/WO2025131354A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • F02M21/0206—Non-hydrocarbon fuels, e.g. hydrogen, ammonia or carbon monoxide
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • F02M21/026—Lift valves, i.e. stem operated valves
    • F02M21/0269—Outwardly opening valves, e.g. poppet valves
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0281—Adapters, sockets or the like to mount injection valves onto engines; Fuel guiding passages between injectors and the air intake system or the combustion chamber

Definitions

  • the present invention relates to an injector for injecting a gaseous medium, in particular a gaseous fuel, into a combustion chamber of an internal combustion engine.
  • the invention relates to an injector with which hydrogen can be injected directly into the combustion chamber of a mixture-compressing, spark-ignition internal combustion engine.
  • Gas injectors are known from the state of the art in various designs. Due to cost advantages and improved environmental compatibility, gaseous fuels have recently become increasingly popular. Compared to injectors for liquid fuels, the injected gas volume occupies a much larger volume than an equivalent amount of liquid fuel. This results in an increased stroke requirement for a closing element, which is usually actuated by a magnetic actuator. Designing a magnetic circuit using standard materials is very difficult or sometimes impossible due to the limited installation space. Materials with higher magnetic force are very expensive and sometimes harmful to health (e.g., FeCo).
  • a gas nozzle for a gas valve which comprises a nozzle body that is at least partially hollow-cylindrical in shape and forms a sealing seat over which a gas flow path leads. Furthermore, the gas valve has a valve-closing element that is partially accommodated in the nozzle body and has an end section that is arranged outside the nozzle body and has a sealing contour that interacts with the sealing seat. Furthermore, the gas valve has a sleeve that surrounds the nozzle body and the end section of the valve-closing element and delimits the gas flow path downstream of the sealing seat.
  • the gas flow path downstream of the sealing seat has a cross-sectional constriction to achieve the Venturi effect, in the region of which at least one intake channel opens.
  • the sleeve is designed in the form of a blow cap that can be applied to the nozzle body.
  • valve closing element In addition, the forces acting on the valve closing element are reduced to a minimum in a special way. This reduces the magnetic force of an actuator that must be selected to keep the injector open, thus enabling the use of cost-effective materials in the actuator's magnetic circuit.
  • the cap-shaped attachment body which can also be referred to as a blow cap, has a specially designed flow influencing geometry and is characterized according to the invention in that the flow influencing geometry is arranged in a multi-part attachment body is integrated, wherein the attachment body comprises a cap-like base body which can be fastened to a nozzle body of the injector, and the base body has a receiving opening into which an insert part can be inserted and fastened there, wherein the insert part contains the geometries responsible for the jet shaping with the outlet of the attachment body.
  • the multi-part design of the attachment body advantageously offers a great deal of flexibility in jet design, as the jet guidance can be varied depending on the geometry of the insert part.
  • several design variants of the attachment body can be tested on a single-cylinder engine, a multi-cylinder engine, or in a jet chamber. This enables faster sampling of the various design variants.
  • Replacing or dismantling an insert part on the attachment bodies is relatively straightforward at any time.
  • only a few design variants are required for the base body of the attachment body, allowing a very wide range of flow designs to be represented despite the variety of insert parts.
  • very complex design variants can be easily implemented in terms of manufacturing technology.
  • the insert is precisely fitted into a receiving opening in the base body of the attachment body and secured, in particular, by means of a screw connection, so that the attachment body forms a complete unit.
  • the insert with the outlet advantageously protrudes beyond the lower end face of the base body in order to solely assume the jet shaping function.
  • a jet splitter serving as a flow rocker is provided on the insert part, which projects from the insert part into the base body against the direction of flow in order to be able to divide the flow in the attachment body at an early stage.
  • a flow deflector protrudes from the insert in the downstream direction.
  • This deflection geometry is either uniformly circumferential or has multiple deflection segments around the circumference.
  • Asymmetric design variants are particularly advantageous when the injector is installed laterally on the cylinder head. This can significantly improve mixture formation; higher efficiency can be achieved; and combustion anomalies can be reduced.
  • a geometry design for the tapered first section is particularly advantageous if the following relation applies at maximum needle stroke lh of the valve closing element: 5 x lh > s > 1 ,5 x lh, where s is the distance between the radially outer contour of the
  • Valve closing element at its downstream edge region and the ring line lying axially below it in a projection on a section of the flow influencing geometry tapering in the flow direction in order to generate a virtually loss-free flow downstream of the valve closing element.
  • the section of the flow control geometry that tapers in the direction of flow downstream of the valve closing element is largely conical. It is advantageous that the angle of inclination a of the inner contour in the area of the tapered section 85° > a > 30°, preferably designed in a size > 45°.
  • This inner contour defined according to the invention can be advantageously accommodated in attachment bodies with reducible external dimensions. This, in turn, enables a very flexible use of sleeves or attachment bodies on injectors in various combustion chamber geometries of internal combustion engines.
  • the present invention is preferably used in injection systems that inject hydrogen directly into a combustion chamber.
  • the injector is suitable for directly injecting hydrogen into a combustion chamber of an internal combustion engine.
  • Figure 1 is a schematic sectional view of an injector for injecting a gaseous medium according to the prior art
  • Figure 2 is a sectional view of a known cap-shaped attachment body for an injector according to Figure 1,
  • Figure 3 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to a first embodiment
  • Figure 4 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to a second embodiment
  • Figure 5 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to a third embodiment
  • Figure 6 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to a fourth embodiment
  • Figure 7 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to a fifth embodiment
  • Figure 8 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to a sixth embodiment
  • Figure 9 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to a seventh embodiment
  • Figure 10 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to an eighth embodiment
  • Figure 11 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to a ninth embodiment
  • Figure 12 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to a tenth embodiment
  • Figure 13 is a schematic sectional view of a cap-shaped attachment body for an injector for injecting a gaseous medium according to an eleventh embodiment
  • Figure 14 is a schematic bottom view of the attachment body according to Figure 13.
  • Figure 1 shows a schematic cross-sectional view of the known injector 1 for injecting a gaseous medium. Since the invention is directed to the flow-influencing geometry 10, which is arranged downstream of the valve seat 3 in terms of flow technology, only this assembly will be described in more detail here for the known injector 1.
  • a magnetic actuator 21, for example, is provided to actuate the injector 1, so that the injector 1 can be controlled in a targeted manner.
  • the injector 1 also has a nozzle body 2, which forms a valve seat 3, e.g., conically shaped, on the injection side for a valve closing element 5 that opens outwards, i.e., towards a combustion chamber 20.
  • the valve closing element 5 is guided axially movably within the nozzle body 2 via a guide 18.
  • the valve closing element 5 has an end section 6 in the form of a valve disk, which forms a sealing seat 7 corresponding to the valve seat 3.
  • the two sealing seat partners, valve seat 3 and valve closing element 5, are each made of metal. The geometric and material design is such that sufficient tightness is guaranteed during operation of a hydrogen engine.
  • a shut-off system installed upstream of the injector 1 for safety reasons would interrupt the supply of the gaseous medium, in particular the highly volatile hydrogen.
  • the sealing contour of the end section 6 of the valve closing element 5 is, for example, rounded, while the valve seat 3 on the nozzle body 2 has a conical shape. However, other contours are also conceivable.
  • a sleeve 8 for jet shaping.
  • a flow-influencing geometry 10 arranged downstream of the sealing seat 7.
  • This can, on the one hand, be directly integrally attached to the nozzle body 2 with be formed, which, however, requires a high manufacturing outlay, or be integrated into an additional component, this component being generally referred to as sleeve 8 in relation to the prior art embodiments in Figures 1 and 2.
  • the sleeve 8 has a large overlap length with the nozzle body 2 in order to be able to fasten the sleeve 8 securely and reliably.
  • a cap-shaped attachment body 8 which, with reference to the exemplary embodiments according to the invention, is also defined as a blow cap 8.
  • the sleeve 8 and the end portion 6 of the valve closure element 5 jointly define a gas flow path 4, into which at least one intake channel 15 formed in the sleeve 8 opens. Air from the environment can be sucked into the gas flow path 4 via the one or more intake channels 15.
  • the gas flow path 4 then leads via the valve seat 3 into an interior of the sleeve 8, which is characterized by a special shape with an inner contour 9.
  • a cross-sectional reduction occurs at a large axial distance from the valve closing element 5 in a central cylindrical axial region 13 of the flow-influencing geometry 10 of the sleeve 8, with the taper being achieved via a conically extending section 12 in the inner contour 9 of the sleeve 8.
  • the intake channels 15 open into the inner contour 9 of the sleeve 8 precisely in the central axial region 13.
  • the reduction in cross-section within the gas flow path 4 ensures that, when the gas flows out via the gas flow path 4 towards an outlet 19, air from the environment is sucked into the gas flow path 4 via the intake channels 15 (“Venturi effect”). This means that Air is added to the gas before it reaches the outlet 19, so that the mixture preparation is improved in this way.
  • the cross-sectional reduction is offset by the fact that the central axial region 13 is again followed by a conical section 14, but in this case widening conically in the direction of flow, with this section 1 extending to the outlet 19.
  • the cross-sectional reduction in the inner contour 9 of the sleeve 8 is intended to achieve the Venturi effect, which is optimized together with the air admixture.
  • the object of the invention is to provide an inner contour 9 of a cap-shaped attachment body 8 with a flow-influencing geometry 10 arranged downstream of the sealing seat 7, with which optimal combustion results are achieved due to the flow guidance according to the invention.
  • Injection systems for the direct injection of a gaseous medium, in particular hydrogen, but also CNG, methane, ammonia or mixtures of the aforementioned gases have the task of specifically controlling the dosage and the injection direction of the gas jet(s) into the combustion chamber 20 via injection valves or, in general, injectors 1.
  • corresponding sleeves or blow caps 8 can be used on the injector 1, as already explained above.
  • the core of the invention is to design the internal flow of the gaseous medium with as little loss as possible via the inventive inner contour 9 of the cap-shaped attachment body 8, so that the back pressure located below, i.e. downstream of the plate-shaped end section 6 of the valve closing element 5 is reduced and, at the same time, the jet can be introduced into the combustion chamber 20 in a targeted manner.
  • This defined inner contour 9, with its special features in shape and design, can advantageously be accommodated in attachment bodies 8 with reducible external dimensions. This, in turn, enables a very flexible use of sleeves or attachment bodies 8 on injectors 1 in various combustion chamber geometries of internal combustion engines.
  • the cap-shaped attachment body 8 is designed in several parts.
  • the attachment body 8 will usually have a significantly shorter overlap length with the nozzle body 2 than shown in Figure 1.
  • the only essential requirement is a secure and reliable attachment to the nozzle body 2, which enables perfect and axially parallel alignment with the injector 1.
  • Known joining methods such as pressing, welding, soldering, gluing, or combinations thereof can be used.
  • Figure 3 shows a first embodiment of a flow-influencing geometry 10 arranged downstream of the valve seat 3 in a cap-shaped attachment body 8 and created via an inventive inner contour 9.
  • the valve closing element 5 with its plate-shaped end section 6 is shown only schematically and in a simplified manner. However, the end section 6 can also have chamfers or rounded portions on its outer contour.
  • the attachment body 8 comprises a cap-like base body 23, which can be fastened to the nozzle body 2 of the injector 1, as already mentioned above.
  • the base body 23 of the attachment body 8 With its inner contour 9, merges into a receiving opening 25, into which an insert part 24 can be inserted and fastened.
  • the insert part 24 is a compact, separately manufactured and largely cylindrical individual component that contains the geometries responsible for jet shaping up to the outlet 19 of the attachment body 8.
  • the receiving opening 25 of the base body 23 is designed such that the insert part 24 can be inserted with a precise fit from the downstream side of the base body 23.
  • a screw connection 22 between the insert part 24 and the base body 23 of the attachment body 8 can ensure a firm and secure connection. Nevertheless, this choice of connection technology allows for the possibility of replacing the insert part 24 with another insert part by loosening the screw connection 22.
  • the insert part 24 is, for example, inserted so deeply into the receiving opening 25 of the base body 23 until it rests against a stop shoulder of the base body 23. In the installed state, the insert part 24 with the outlet 19 can protrude beyond the lower end face of the base body 23, so that the geometry of the inner contour 9 of the insert part 24 is solely responsible for the jet shaping and there is no influence from the outer contour of the base body 23.
  • the insert part 24 has an inner contour 9 that initially has a trough-like inlet area 30, from which several outlet bores 31 lead to the outlet 19.
  • the outlet bores 31 can be designed as inclined bores.
  • a central outlet bore 31 can, for example, run parallel to the axis, as shown. Ideally, between two and ten outlet bores 31 are provided to achieve a homogeneous jet distribution.
  • the base body 23 upstream of the insert part 24 also already has several interesting aspects and geometric specifications, with the relationship between two surfaces being an essential criterion.
  • the two surfaces As and Ai are considered, which result at maximum valve needle lift lh, i.e. with the sealing seat 7 maximally open and thus the valve closing element 5 maximally lifted.
  • the surface As represents the annular seat cross-sectional area that results between the valve seat 3 and the contact line of the end section 6 of the valve closing element 5, while the surface Ai is determined by the distance that results from the shortest distance between the outer contour of the valve closing element 5 at its downstream edge region and the opposite wall of the inner contour 9.
  • Attachment body 8 which ensures a significant tapering of the inner contour 9 over a short axial extent, which also advantageously contributes to the desired optimized flow result.
  • the ratio of the areas As and Ai should be: Ai > 2.5 x As.
  • the jet guidance from the sealing seat 7 is achieved via the inner contour 9 in the conical section 12, which is designed with an inclination angle a of 85° > a > 30°, preferably with an inclination angle a of > 45°.
  • This relatively large angle a of the conical section 12 generates a strong radially inward flow component over a very short axial length.
  • the lines of the flow path 4 illustrate this.
  • a further characteristic of the design of the inner contour 9 is the distance s which results at maximum needle lift lh between the radially outer contour of the valve closing element 5 at its downstream edge region and the ring line lying axially below it in a projection on the conical section 12.
  • the following should apply: 5 x lh > s > 1.5 x lh in order to generate a virtually loss-free flow around the end section 6 of the valve closing element 5.
  • 4 x lh > s > 2.5 x lh applies.
  • the maximum needle lift lh extends over an axial extension length of 100 pm to 2 mm, whereby the maximum needle lift lh will ideally be between 0.15 mm and 0.5 mm.
  • a flow redirection takes place over a short axial distance in the area of the valve closing element 5 from a large diameter in the area of the sealing seat 7 to a significantly smaller diameter with an inner surface A2 at the end of the tapered, in particular conically extending section 12, so that in this area immediately downstream of the valve closing element 5, a flow deflection advantageously takes place in the form of an "S-bend".
  • this section 12 can also be slightly convex or slightly concave.
  • the axial region 13 is ideally a cylindrical hole section that merges directly into the receiving opening 25. While the first conical section 12 immediately downstream of the valve closing element 5 ensures a strong flow deflection, the axial region 13, as the second downstream section, is responsible for generating high jet stability. In addition, a reduction in losses or turbulence in the wall region is achieved, whereby an overall almost effective filling of the flow cross-section in the cylindrical axial region 13 is made possible. A bore diameter that is as small as possible in the axial region 13 contributes to the reduction of the dead volume.
  • Figure 4 shows a schematic sectional view of a cap-shaped attachment body 8 for an injector 1 for injecting a gaseous medium according to a second exemplary embodiment.
  • This outlet bore 31 has a short cylindrical section, to which an obliquely and additionally conically tapered section of the outlet bore 31 in order to produce an asymmetrical one-sided jet pattern.
  • FIG. 5 shows a schematic sectional view of a cap-shaped attachment body 8 for an injector 1 for injecting a gaseous medium according to a third exemplary embodiment.
  • the insert part 24 has, for example, between two and ten outlet bores 31, which can be designed as inclined bores.
  • the special feature of the solution shown in Figure 3 is a jet splitter 26 serving as a flow rocker or spoiler, which, as shown, can be largely pointed or can also be designed with a small plateau. Alternatively, the jet splitter 26 can also be rounded.
  • the jet splitter 26 projects from the insert part 24 against the flow direction into the axial region 13 and possibly also into the conically extending section 12 of the base body 23, so that a flow division can be carried out early on in the attachment body 8.
  • a screw connection 22 is again provided for the firm connection of the insert part 24 and the base body 23.
  • Figure 6 shows a schematic sectional view of a cap-shaped attachment body 8 for an injector 1 for injecting a gaseous medium according to a fourth exemplary embodiment.
  • the insert part 24 has, for example, between two and ten outlet bores 31, which can be designed as oblique bores, but have an orientation converging radially inward towards the central axis.
  • the jet splitter 26, which serves as a flow rocker or spoiler, has a larger-area plateau, from which flow can be guided along the jet splitter 26 to the outlet bores 31.
  • the jet splitter 26 can also be rounded.
  • the jet splitter 26 projects from the insert part 24 against the flow direction into the axial region 13 and possibly also into the conically extending section 12 of the base body 23, so that a Flow distribution can be carried out early in the attachment body 8.
  • a screw connection 22 is provided for the firm connection of the insert part 24 and the base body 23.
  • FIG. 7 shows a schematic sectional view of a cap-shaped attachment body 8 for an injector 1 for injecting a gaseous medium according to a fifth exemplary embodiment.
  • the outlet bores 31 have a common short cylindrical section, which is adjoined on the one hand by an oblique and also conically tapered section of the first outlet bore 31 and on the other hand by a largely axially parallel and, for example, also conically tapered section of the second outlet bore 31 in order to produce an asymmetrical jet pattern.
  • FIG. 8 shows a schematic sectional view of a cap-shaped attachment body 8 for an injector 1 for injecting a gaseous medium according to a sixth exemplary embodiment.
  • This solution provides a single outlet bore 31 formed as a central bore.
  • This outlet bore 31 has a short cylindrical section, which is adjoined by an axially parallel and conically tapered section of the outlet bore 31 in order to generate a central, symmetrical, and focused jet pattern.
  • Figure 9 shows a schematic sectional view of a cap-shaped
  • Attachment body 8 for an injector 1 for injecting a gaseous medium according to a seventh exemplary embodiment.
  • This exemplary embodiment is characterized in that a flow deflector 27 protrudes from the insert part 24 in the downstream direction.
  • the flow deflector 27 can either be formed integrally with the insert part 24 or can be fastened to its interior, for example by welding.
  • the flow deflector 27 is designed, for example, like a tappet and ends with a deflection geometry 28.
  • the deflection geometry 28 is formed on a plate-shaped end section of the flow deflector 27. In the exemplary embodiment shown, the deflection geometry 28 is designed to extend 360°, with the deflection angle of the deflection geometry 28 being selected to be constant over the circumference.
  • the flow emerging from the insert part 24 experiences a strongly radially outward-directed component due to the impact on the deflection geometry 28 of the flow deflector 27 in order to generate a widely fanned-out spray pattern.
  • Figure 10 shows a schematic sectional view of a cap-shaped attachment body 8 for an injector 1 for injecting a gaseous medium according to an eighth exemplary embodiment.
  • This solution is very similar to the exemplary embodiment shown in Figure 3.
  • the insert part 24 is not fastened in the base body 23 via a screw connection 22 in the receiving opening 25; rather, the insert part 24 is secured in the receiving opening 25 of the base body 23 by means of several circumferentially engaging screws 33, which extend through transverse openings in the base body 23 and radially inward into threaded bores of the insert part 24.
  • Figure 11 shows a schematic sectional view of a cap-shaped attachment body 8 for an injector 1 for injecting a gaseous medium according to a ninth embodiment.
  • Figure 12 shows a schematic sectional view of a cap-shaped attachment body 8 for an injector 1 for injecting a gaseous medium according to a tenth embodiment.
  • This solution differs only slightly from that according to Figure 9.
  • This embodiment is again characterized in that a flow deflector extends from the insert part 24 in the downstream direction.
  • Figure 13 shows a schematic sectional view of a cap-shaped attachment body 8 for an injector 1 for blowing in a gaseous medium according to an eleventh embodiment
  • Figure 14 shows a schematic bottom view of the attachment body 8 according to Figure 13 shows.
  • Figures 13 and 14 show the variant of a non-circulating flow deflector 27.
  • the flow deflector is, for example, only circularly formed over approximately 270°, while to generate an asymmetrical jet pattern, the tappet of the flow deflector 27 runs parallel to the axis in a partial section of approximately 90° and therefore does not provide any flow deflection there at all.
  • the extensive customer variations can be covered by a customized geometry of the insert part 24. This allows all customer-specific design variants to be manufactured cost-effectively and with less effort.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

La présente invention concerne un injecteur (1) pour injecter un milieu gazeux, en particulier un carburant gazeux, de préférence de l'hydrogène, dans une chambre de combustion (20) d'un moteur à combustion interne L'injecteur (1) comprend, entre autres, un élément de fermeture de soupape (5) axialement mobile pour ouvrir et fermer au moins une ouverture au niveau d'un siège d'étanchéité (7), un actionneur (21) pour actionner l'élément de fermeture de soupape (5), et une géométrie influençant l'écoulement (10) placée en aval du siège d'étanchéité (7) en termes d'écoulement. Selon l'invention, la géométrie influençant l'écoulement (10) est intégrée dans un corps de fixation en plusieurs parties (8), le corps de fixation (8) comprenant une partie principale en forme de capuchon (23) qui peut être fixée à un corps de buse (2) de l'injecteur (1), et la partie principale (23) présentant une ouverture de réception (25), dans laquelle une partie insert (24) peut être insérée et dans laquelle la partie insert peut être fixée, ladite partie insert (24) ayant les géométries responsables du processus de formation de jet et comprenant la sortie (19) du corps de fixation (8).
PCT/EP2024/075886 2023-12-21 2024-09-17 Injecteur pour injecter un milieu gazeux Pending WO2025131354A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102023213164.1 2023-12-21
DE102023213164.1A DE102023213164A1 (de) 2023-12-21 2023-12-21 Injektor zum Einblasen eines gasförmigen Mediums

Publications (1)

Publication Number Publication Date
WO2025131354A1 true WO2025131354A1 (fr) 2025-06-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/075886 Pending WO2025131354A1 (fr) 2023-12-21 2024-09-17 Injecteur pour injecter un milieu gazeux

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DE (1) DE102023213164A1 (fr)
WO (1) WO2025131354A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014224339A1 (de) * 2014-11-28 2016-06-02 Robert Bosch Gmbh Direkteinblasender Gasinjektor mit verbesserter Kühlung
DE102017219932A1 (de) * 2017-11-09 2019-05-09 Robert Bosch Gmbh Injektor zur Eindüsung von gasförmigem Kraftstoff
DE102021206438A1 (de) 2021-06-23 2022-12-29 Robert Bosch Gesellschaft mit beschränkter Haftung Gasdüse für ein Gasventil
WO2023001384A1 (fr) 2021-07-23 2023-01-26 Volvo Truck Corporation Capuchon de buse pour une buse d'injection de carburant utilisable dans un moteur à combustion interne à hydrogène

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014224339A1 (de) * 2014-11-28 2016-06-02 Robert Bosch Gmbh Direkteinblasender Gasinjektor mit verbesserter Kühlung
DE102017219932A1 (de) * 2017-11-09 2019-05-09 Robert Bosch Gmbh Injektor zur Eindüsung von gasförmigem Kraftstoff
DE102021206438A1 (de) 2021-06-23 2022-12-29 Robert Bosch Gesellschaft mit beschränkter Haftung Gasdüse für ein Gasventil
WO2023001384A1 (fr) 2021-07-23 2023-01-26 Volvo Truck Corporation Capuchon de buse pour une buse d'injection de carburant utilisable dans un moteur à combustion interne à hydrogène

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