EP3475555A1 - Corps d'injecteur pour un injecteur de carburant - Google Patents

Corps d'injecteur pour un injecteur de carburant

Info

Publication number
EP3475555A1
EP3475555A1 EP17731874.8A EP17731874A EP3475555A1 EP 3475555 A1 EP3475555 A1 EP 3475555A1 EP 17731874 A EP17731874 A EP 17731874A EP 3475555 A1 EP3475555 A1 EP 3475555A1
Authority
EP
European Patent Office
Prior art keywords
nozzle body
nozzle
cooling
matrix
kidney
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
Application number
EP17731874.8A
Other languages
German (de)
English (en)
Other versions
EP3475555B1 (fr
Inventor
Walter Walkner
Arno Seiringer
Heinrich Werger
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 EP3475555A1 publication Critical patent/EP3475555A1/fr
Application granted granted Critical
Publication of EP3475555B1 publication Critical patent/EP3475555B1/fr
Active 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/043—Injectors with heating, cooling, or thermally-insulating means with cooling means other than air cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/08—Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
    • 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
    • F02M61/1866—Valve seats or member ends having multiple cones
    • 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
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/07—Nozzles and injectors with controllable fuel supply
    • F02M2700/077—Injectors having cooling or heating means

Definitions

  • the invention relates to a nozzle body for a fuel injector for
  • a nozzle body for a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine according to the preamble of claim 1 is known from EP 1 781 931 Bl.
  • the known fuel injector comprises a holding body, a valve body with throttle plate and a nozzle body.
  • the holding body and the nozzle body are through a nozzle retaining nut
  • a pressure chamber is formed, which is supplied via an inlet bore with pressurized fuel.
  • An at least one injection opening releasing or closing longitudinally movable nozzle needle is arranged to be longitudinally movable in the pressure chamber.
  • the nozzle body according to the invention for a fuel injector has cooling channels which are optimized in their cooling effect. Nevertheless, the nozzle body is designed in one piece, so that can be dispensed with elaborate manufacturing techniques and seals. Furthermore, the structural weakening of the nozzle body by the cooling channels is only marginal. For this purpose, a pressure chamber is formed in the nozzle body, which has a
  • Inlet bore can be supplied with fuel under high pressure.
  • a nozzle needle releasing or closing at least one injection opening is arranged longitudinally movably in the pressure space. The at least one
  • Injection opening is formed in a nozzle tip of the nozzle body.
  • In the nozzle body can be flowed through with cooling medium cooling channels.
  • Cooling channels comprise a cooling matrix formed in the nozzle tip.
  • the nozzle body is also made in one piece.
  • the cooling matrix has the largest possible effective for the cooling surface, so that the heat input from the nozzle tip into the cooling medium is very large and the cooling of the nozzle body thereby particularly effective.
  • the cooling channels, in particular the cooling matrix, are
  • the cooling matrix is designed fence-shaped, meandering or helical.
  • the entire convection surface of the cooling matrix ie the separation surface between the nozzle body and the cooling matrix, can be made very large.
  • a large heat flow from the nozzle tip into the Cooling medium is the result.
  • the cooling of the nozzle body is thereby particularly effective.
  • the flow through the cooling matrix is additionally designed in a particularly defined manner; there is no danger of the cooling medium standing in local areas and not flowing.
  • the cooling matrix is designed ring-cylindrical.
  • the nozzle body can be made very compact in its axial dimensions.
  • the cooling matrix is penetrated by material pores of the nozzle tip. As a result, the entire convection surface can be increased again. The heat exchange between the nozzle tip and the cooling medium is thereby further optimized.
  • the cooling channels comprise an elongated
  • Inlet channel and an elongated flow channel for supplying and discharging cooling medium in the cooling matrix and from the cooling matrix.
  • the nozzle tip is the hottest portion of the nozzle body and the cooling matrix disposed therein.
  • the supply and removal of the cooling medium in the nozzle body or from the nozzle body takes place at the nozzle tip
  • Drain channel is therefore a fluidically favorable design to connect the cooling matrix hydraulically to the supply of cooling medium.
  • the cooling channels have an inlet kidney and an outlet kidney.
  • the inlet kidney and the Auslassniere are formed on one of the nozzle tip opposite end face of the nozzle body.
  • the inlet kidney goes into the inlet channel and the outlet kidney goes into the outlet channel.
  • the nozzle body can be braced on the end face with a further component, for example a holding body or a throttle plate, the connection of the cooling channels not being tight
  • the inlet kidney and the outlet kidney are the hydraulic connection of the cooling channels to the adjacent component. Due to the comparatively large areas of the two kidneys, have Dimensional deviations to the connection geometries no disadvantage
  • the nozzle body has a
  • Thermal conductivity has as the remaining area of the nozzle body.
  • the amount of heat transported through the convection area is therefore particularly large.
  • defined main heat flows can be advantageously arranged, for example, from the injection openings to the cooling matrix.
  • a particularly thermally conductive material for example, copper for the
  • Convection area can be used. Due to the 3D printing process nevertheless creates a solid cohesive connection to the other
  • Nozzle body in a fuel injector has a
  • Control valve for controlling the pressure of a control room.
  • the control chamber is limited by the nozzle needle.
  • the opening and closing movements of the nozzle needle are thus controlled by the pressure in the control chamber, which in turn is controlled by the control valve.
  • the manufacturing method of the nozzle body according to the invention is an SD printing method, since only so that the complex geometry of the cooling matrix can be realized in a one-piece nozzle body. Sealing plugs, other components, welds, sealants and the like
  • Body made of the nozzle body, preferably by forging or casting.
  • this basic body optional partial geometries of the Be designed cooling channels, for example as a longitudinal section of holes or as a half-model. Subsequently, the remaining, the cooling channels
  • convection areas can then also be applied with a material of high thermal conductivity by means of 3D printing.
  • Fig. 4 shows a detail of a negative form of cooling channels in another
  • FIG. 1 shows a longitudinal section of a fuel injector 100 for injecting fuel into the combustion chamber of an internal combustion engine, as is known from the prior art.
  • the known fuel injector 100 comprises a holding body 1, a
  • Valve body 3 a throttle plate 5 and a nozzle body 16. All these components are held together by a nozzle retaining nut 7.
  • the nozzle body 16 in this case contains a nozzle needle 6, which in an im
  • Nozzle body 16 formed pressure chamber 8 is arranged longitudinally displaceable. During an opening movement of the nozzle needle 6 fuel over several in Nozzle body 16 injection openings 60 injected into the combustion chamber of the internal combustion engine.
  • a collar is visible, on which a compression spring 61 is supported.
  • the other end of the compression spring 61 is supported on a control sleeve 62, which in turn rests against the underside of the throttle plate 5.
  • the control sleeve 62 defines with the upper, the injection openings 60 opposite end face of the nozzle needle 6 and the underside of the throttle plate 5 a control chamber 63.
  • the pressure prevailing in the control chamber 63 pressure is decisive for the control of the longitudinal movement of the nozzle needle 6.
  • An inlet bore 64 is formed in the fuel injector 100. About the
  • the fuel pressure on the one hand in the pressure chamber 8 is effective, where he exerts a force in the opening direction of the nozzle needle 6 via a pressure shoulder of the nozzle needle 6.
  • this fuel pressure acts via an inlet throttle 65 formed in the control sleeve 62 in the control chamber 63 and, supported by the force of the compression spring 61, holds the nozzle needle 6 in its
  • the fuel injector 100 further includes a control valve 2 for controlling the
  • Outflow channel 76 flow.
  • the lowering of the hydraulic force in this way on the upper end face of the nozzle needle 6 leads to an opening of the nozzle needle 6.
  • the fuel from the pressure chamber 8 thus passes through the injection openings 60 into the combustion chamber of the internal combustion engine.
  • cooling passages 30 are in valve body 3, throttle plate 5 and nozzle body 16 of the known
  • Fuel injector 100 is formed. Thus, especially the tip of the nozzle needle 6 and the nozzle body 16 can be cooled.
  • the cooling channels 30 are partially in the inlet bore 64. However, this is only due to the sectional view, in the embodiments are the
  • Cooling channels 30 separated from the inlet bore 64.
  • the cooling channels 30 are now formed in a one-piece SD printed nozzle body 16.
  • any shapes of the cooling channels can be realized, on the other hand can be dispensed with a complex construction with multiple components.
  • FIG. 2 shows a nozzle body 16 produced in the 3D printing process in a perspective transparent view.
  • the inlet bore 64 in the pressure chamber 8 is not shown.
  • the nozzle body 16 are as usual the
  • Cooling channels 30 are formed so that they have a very large area to the nozzle body 16 in the region of the nozzle tip 16a of the nozzle body 16, ie near the injection openings 60.
  • the cooling channels 30 comprise an inlet kidney 33 and an outlet kidney 34 for connection to the component adjacent to the nozzle body 16, thus, for example, the throttle plate 5 or the holding body 1, depending on the design of the
  • Fuel injector 100 The external cooling connections of the fuel injector 100 are generally formed on the holding body 1.
  • the cooling channels 30 further comprise an elongate inlet channel 31, an elongate outlet channel 32 and a cooling matrix 35.
  • the cooling matrix 35 is preferably provided with a large total area for effective cooling of the nozzle tip 16a, so that maximum heat transfer from the very hot nozzle tip 16a in FIG that the cooling channels 30th can flow through cooling medium. This extends the
  • Cooling matrix 35 preferably also over the entire circumference of the nozzle tip 16a.
  • Convection region 37 as shown in Figure 2 surrounding the cooling matrix 35.
  • the convection region 37 is made of a different material, for example copper, than the remaining nozzle body 16, but nevertheless connected to it in a material-locking manner due to the 3D printing.
  • the convection region 37 has a particularly high thermal conductivity and serves to conduct the largest possible amount of heat from very hot regions of the nozzle body 16 to the cooling matrix 35.
  • the convection region 37 is arranged in the vicinity of the injection openings 60 in the nozzle tip 16a, since there usually the highest temperatures of the fuel injector 100 prevail.
  • cooling matrix 35 is executed fence-shaped. Further embodiments are shown in the following figures 3 and 4.
  • FIG 3 shows a negative model of the cooling matrix 35 - ie the geometry of the cooling medium - in helical or meander shape. Due to the meandering shape, the cooling matrix 35 flows through in a particularly defined manner, since there are no branches in the flow direction. Standing cooling medium - and thus locally low heat transfer coefficients - are thus excluded.
  • cooling matrix 35 as a ring cylinder with a plurality of
  • the pores 36 are thus material of the nozzle body 16, for example steel.
  • the convection surface of the cooling matrix 35 is particularly large. Accordingly, a large heat input from the nozzle tip 16a into the cooling medium can occur.
  • the cooling matrix 35 may also be annular.
  • Nozzle body 16 to use. Especially with regard to the property of the thermal conductivity, heat flows in the direction of the cooling channels 30 can thus be advantageously influenced.
  • One or more convection regions 37 which have a particularly high thermal conductivity and preferably run from the region of the injection openings 60 to the cooling matrix 35, are applied by means of 3D printing.
  • the cooling channels 30 may already be present in partial contours.
  • the outer region of the nozzle body 16, in particular the region surrounding the cooling matrix 35 and optionally also the convection region 17, is then applied by means of 3D printing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)

Abstract

L'invention concerne un corps d'injecteur (16), destiné en particulier à être utilisé dans un injecteur de carburant (100) servant à injecter du carburant dans la chambre de combustion d'un moteur à combustion interne. Le corps d'injecteur (16) est réalisé d'une seule pièce. Une chambre de pression (8) est formée dans le corps d'injecteur (16), laquelle peut être alimentée en carburant sous haute pression par le biais d'un trou d'alimentation (64). Une aiguille d'injecteur (6) dégageant ou fermant au moins un orifice d'injection (60) est agencée dans la chambre de pression (8) de manière à pouvoir se déplacer longitudinalement. L'orifice d'injection ou les orifices d'injection (60) sont ménagés dans une pointe (16a) d'injecteur du corps d'injecteur (16). Des canaux de refroidissement (30) pouvant être traversés par un réfrigérant sont formés dans le corps d'injecteur (16). Les canaux de refroidissement (30) comportent une matrice de refroidissement (35) formée dans la pointe d'injecteur (16a).
EP17731874.8A 2016-06-27 2017-06-20 Corps d'injecteur pour un injecteur de carburant Active EP3475555B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016211477.8A DE102016211477A1 (de) 2016-06-27 2016-06-27 Düsenkörper für einen Kraftstoffinjektor
PCT/EP2017/065128 WO2018001797A1 (fr) 2016-06-27 2017-06-20 Corps d'injecteur pour un injecteur de carburant

Publications (2)

Publication Number Publication Date
EP3475555A1 true EP3475555A1 (fr) 2019-05-01
EP3475555B1 EP3475555B1 (fr) 2020-10-28

Family

ID=59093557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17731874.8A Active EP3475555B1 (fr) 2016-06-27 2017-06-20 Corps d'injecteur pour un injecteur de carburant

Country Status (6)

Country Link
EP (1) EP3475555B1 (fr)
JP (1) JP6757805B2 (fr)
KR (1) KR102303418B1 (fr)
CN (1) CN109416007B (fr)
DE (1) DE102016211477A1 (fr)
WO (1) WO2018001797A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1026728B1 (fr) * 2018-10-25 2020-05-28 Soudobeam Sa Organe d'injection de gaz, four muni d'un tel organe et son utilisation
CN110408921B (zh) * 2019-07-04 2022-02-22 广东省新材料研究所 一种喷嘴及其加工方法
DE102019120046A1 (de) * 2019-07-24 2021-01-28 Liebherr-Components Deggendorf Gmbh Kraftstoffinjektor
KR102607623B1 (ko) * 2021-07-13 2023-11-29 주식회사 이엠엘 분말제조용 고압가스 회전 노즐

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Also Published As

Publication number Publication date
KR20190020798A (ko) 2019-03-04
JP2019518170A (ja) 2019-06-27
DE102016211477A1 (de) 2017-12-28
EP3475555B1 (fr) 2020-10-28
JP6757805B2 (ja) 2020-09-23
KR102303418B1 (ko) 2021-09-24
CN109416007B (zh) 2021-04-30
CN109416007A (zh) 2019-03-01
WO2018001797A1 (fr) 2018-01-04

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