EP1712776A1 - Valve body and fluid injector with a valve body - Google Patents

Valve body and fluid injector with a valve body Download PDF

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Publication number
EP1712776A1
EP1712776A1 EP05008192A EP05008192A EP1712776A1 EP 1712776 A1 EP1712776 A1 EP 1712776A1 EP 05008192 A EP05008192 A EP 05008192A EP 05008192 A EP05008192 A EP 05008192A EP 1712776 A1 EP1712776 A1 EP 1712776A1
Authority
EP
European Patent Office
Prior art keywords
sack
disc
needle
valve body
seat
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
EP05008192A
Other languages
German (de)
French (fr)
Other versions
EP1712776B1 (en
Inventor
Alessandro Morelli
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE200560007856 priority Critical patent/DE602005007856D1/en
Priority to EP20050008192 priority patent/EP1712776B1/en
Publication of EP1712776A1 publication Critical patent/EP1712776A1/en
Application granted granted Critical
Publication of EP1712776B1 publication Critical patent/EP1712776B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • 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
    • F02M61/188—Spherical or partly spherical shaped valve member ends

Definitions

  • the invention relates to a valve body and a fluid injector.
  • the valve body comprises a needle and a cartridge with a recess, which takes in the needle and which comprises on one of its ends a seat plate, that comprises a needle seat for the inward-opening needle.
  • Fluid injectors in particular fuel injectors for diesel or gasoline internal combustion engines, comprise a housing, an actuator unit and a valve body. In the case of an inward-opening needle the needle controls the flow of the fluid into a sack volume, which leads to a nozzle.
  • fluid injectors in particular fuel injectors for internal combustion engines, are arranged in a cylinder head of the internal combustion engine in a way, that they inject the fuel directly into a combustion chamber of the engine.
  • fluid pressure may reach up to 200 bars
  • fluid pressure may reach up to 2000 bars.
  • the object of the invention is to create a valve body and a fluid injector, which enabables simply an intended fluid atomization.
  • the object concerning the valve body is achieved by the features of claim 1.
  • the object concerning the fluid injector is achieved by the features of claim 6.
  • Advantageous embodiments of the invention are given in the subclaims.
  • the invention is distinguished by a valve body with a needle and a cartridge.
  • the recess takes in the needle and comprises on one of its ends a seat plate.
  • the seat plate comprises a needle seat for the inward opening needle, with the needle further comprising a seat part with a sealing area that is designed to rest on the needle seat.
  • At least one sack disc is fixed to the seat plate and restricts a sack volume in conjunction with the seat plate and the seat part of the needle.
  • Each sack disc comprises a sack disc recess in order to modify the sack volume.
  • An orifice disc is arranged facing away from the sack volume related to the sack disc, and the orifice disc comprises a nozzle.
  • the invention concerning the fluid injector is distinguished by a fluid injector with a housing, an actuator unit and the valve body.
  • the sack disc recess forms a spherical free volume. While operating the injector the spherical free volume produces vortices in fluid which enables an intended atomization of the fluid.
  • the sack disc recess forms a cylindrical free volume.
  • a cylindrical free volume in the sack disc easily increases the sack volume.
  • the sack disc comprises a dowel pin hole.
  • the dowel pin hole enables easy assembling of the sack disc, further sack discs and/or the orifice disc.
  • the sack disc, further sack discs and/or the orifice disc are laser-welded. This enables easy assembling of the sack disc.
  • a fluid injector that is used as a fuel injector for an internal combustion engine, comprises a housing 1, a valve body 2, an actuator unit and a fuel connector ( Figure 1).
  • the fuel connector is designed to be connected to a high pressure fuel chamber of the internal combustion engine, where fuel is stored under high pressure, for example under the pressure of about 200 bar.
  • the housing 1 is preferably formed in a way, that there is a space to lead the fuel from the fuel connector to a fuel inlet of the valve body.
  • the actuator unit is preferably arranged in the housing.
  • the actuator unit may be of a type known to a person skilled in the art, that is suitable for that purpose. It may, for example, contain a piezoelectric actuator. However, it may alternatively contain an electromagnetic actuator, that comprises an armature 31, a solenoid 32 and a pole element 33. A return spring 25 is arranged and pre-loaded in such a way, that it pushes the armature 31 away from the pole element 33 unless an electromagnetic force created by the solenoid 32 is larger than the pre-loading force of the return spring 25.
  • the valve body 2 comprises a cartridge 21, which is fixed to the housing 1 at one of its free ends, preferably by welding, especially by laser-welding.
  • the cartridge 21 comprises a recess 23, which takes in a needle 22 and also serves as a fluid duct.
  • the recess 23 of the cartridge 21 takes in on one of its ends a seat plate 27, which comprises in a conically-shaped area a needle seat 29 for the inward-opening needle 22.
  • the needle 22 comprises a seat part 24 with a sealing area, that is destined to rest on the needle seat 29, if the seat part 24 is pushed against the needle seat 29.
  • the needle 22 is mechanically coupled to the armature 31.
  • the seat part 24 of the needle 22 may be spherically-shaped, which improves the sealing quality between the seat part 24 and the sealing area of the needle seat 29.
  • the spherical shape can be easily obtained by forming the seat part 24 out of a ball with a hole, where the needle 22 is taken in.
  • the ball is preferably fixed to the needle 22 by welding.
  • a sack volume 35 which is limited by respective walls of the seat plate 27 and by a sack disc 39, which has a recess 40.
  • the sack disc 39 comprises a sack disc recess 40.
  • the sack disc recess 40 increases the sack volume 35. This offers the possibility to form different sack volume 35 shapes just by changing the sack disc 39.
  • the fluid atomization is strongly dependent on the shape and size of the sack volume 35.
  • the orifice disc 37 and/or the sack disc 39 comprise at least one hole 43 for a dowel pin.
  • the dowel pin is arranged in the dowel pin hole 43.
  • the orifice disc 37 and the sack disc 39 preferably are laser-welded. They may be also fixed in a different way.
  • the multiple sack discs 39a,b,c,d comprise multiple sack disc recesses 40a,b,c,d. This easily increases the possibility of influencing the sack volume 35. Also a plurality of different sack volume 35 shapes and dependent on this different spray atomizations are feasible.
  • the sack disc recesses 40a,b,c,d for example can form a spherical free volume ( Figure 2). This embodiment will create turbulences in the fluid, which increases atiomzaion of the fluid.
  • the sack disc recesses 40a,b,c,d form a conical shaped free Volume ( Figure 3) preferably with steps from one sack disc 39a,b,c,d to the other.
  • the corners of the steps create areas of fast fluid flow and also areas of slow fluid flow. At the borders of those areas evolve turbulences in the fluid, which increases fluid atomization.

Abstract

The invention is distinguished by a valve body with a needle (22) and a cartridge (21). A recess (22) of the cartridge (21) takes in the needle (22) and comprises on one of its ends a seat plate (27). The seat plate (27) comprises a needle seat (29) for the inward opening needle (22), with the needle (22) further comprising a seat-part (24) with a sealing area that is designed to rest on the needle seat (29). At least one sack disc (39a) is fixed to the seat plate (27) and restricts the sack volume (35) in conjuction with the seat plate (27) and the seat part (24) of the needle (22). Each sack disc (39a) comprises a sack disc recess (40a) in order to modify the sack volume (35). An orifice disc (37) is arranged facing away from the sack volume (35) related to the sack disc (39a), and the orifice disc (37) comprises a nozzle (41).

Description

  • The invention relates to a valve body and a fluid injector. The valve body comprises a needle and a cartridge with a recess, which takes in the needle and which comprises on one of its ends a seat plate, that comprises a needle seat for the inward-opening needle. Fluid injectors, in particular fuel injectors for diesel or gasoline internal combustion engines, comprise a housing, an actuator unit and a valve body. In the case of an inward-opening needle the needle controls the flow of the fluid into a sack volume, which leads to a nozzle.
  • In order to meet the requirements of strict emission legislation and in order to save fuel consumption fluid injectors, in particular fuel injectors for internal combustion engines, are arranged in a cylinder head of the internal combustion engine in a way, that they inject the fuel directly into a combustion chamber of the engine. In order to get a very fine atomization of the fluid in such applications it is necessary to provide the fluid under high pressure. In gasoline internal combustion engines the fluid pressure may reach up to 200 bars, in diesel engines fluid pressure may reach up to 2000 bars.
  • The object of the invention is to create a valve body and a fluid injector, which enabables simply an intended fluid atomization.
  • The object concerning the valve body is achieved by the features of claim 1. The object concerning the fluid injector is achieved by the features of claim 6. Advantageous embodiments of the invention are given in the subclaims.
  • The invention is distinguished by a valve body with a needle and a cartridge. The recess takes in the needle and comprises on one of its ends a seat plate. The seat plate comprises a needle seat for the inward opening needle, with the needle further comprising a seat part with a sealing area that is designed to rest on the needle seat. At least one sack disc is fixed to the seat plate and restricts a sack volume in conjunction with the seat plate and the seat part of the needle. Each sack disc comprises a sack disc recess in order to modify the sack volume. An orifice disc is arranged facing away from the sack volume related to the sack disc, and the orifice disc comprises a nozzle.
  • The invention concerning the fluid injector is distinguished by a fluid injector with a housing, an actuator unit and the valve body.
  • In an advantageous embodiment of the valve body the sack disc recess forms a spherical free volume. While operating the injector the spherical free volume produces vortices in fluid which enables an intended atomization of the fluid.
  • In a further advantageous embodiment of the valve body the sack disc recess forms a cylindrical free volume. A cylindrical free volume in the sack disc easily increases the sack volume.
  • In a further advantageous embodiment of the valve body the sack disc comprises a dowel pin hole. The dowel pin hole enables easy assembling of the sack disc, further sack discs and/or the orifice disc.
  • In a further advantageous embodiment of the valve body the sack disc, further sack discs and/or the orifice disc are laser-welded. This enables easy assembling of the sack disc.
  • Exemplary embodiments of the invention are explained in the following with the aid of schematic drawings. These are as follows:
    • Figure 1
    a first embodiment of a fluid injector with a valve body,
    Figure 2
    an enlargement of the valve body according to Figure 1 with a first embodiment of sack discs,
    Figure 3
    an enlargement of the valve body according to Figure 1 with a second embodiment of the sack discs.
  • Elements of the same design and function that occur in the different illustrations are identified by the same reference character.
  • A fluid injector, that is used as a fuel injector for an internal combustion engine, comprises a housing 1, a valve body 2, an actuator unit and a fuel connector (Figure 1). The fuel connector is designed to be connected to a high pressure fuel chamber of the internal combustion engine, where fuel is stored under high pressure, for example under the pressure of about 200 bar.
  • The housing 1 is preferably formed in a way, that there is a space to lead the fuel from the fuel connector to a fuel inlet of the valve body.
  • The actuator unit is preferably arranged in the housing. The actuator unit may be of a type known to a person skilled in the art, that is suitable for that purpose. It may, for example, contain a piezoelectric actuator. However, it may alternatively contain an electromagnetic actuator, that comprises an armature 31, a solenoid 32 and a pole element 33. A return spring 25 is arranged and pre-loaded in such a way, that it pushes the armature 31 away from the pole element 33 unless an electromagnetic force created by the solenoid 32 is larger than the pre-loading force of the return spring 25.
  • The valve body 2 comprises a cartridge 21, which is fixed to the housing 1 at one of its free ends, preferably by welding, especially by laser-welding. The cartridge 21 comprises a recess 23, which takes in a needle 22 and also serves as a fluid duct. The recess 23 of the cartridge 21 takes in on one of its ends a seat plate 27, which comprises in a conically-shaped area a needle seat 29 for the inward-opening needle 22. The needle 22 comprises a seat part 24 with a sealing area, that is destined to rest on the needle seat 29, if the seat part 24 is pushed against the needle seat 29. The needle 22 is mechanically coupled to the armature 31.
  • The seat part 24 of the needle 22 may be spherically-shaped, which improves the sealing quality between the seat part 24 and the sealing area of the needle seat 29. The spherical shape can be easily obtained by forming the seat part 24 out of a ball with a hole, where the needle 22 is taken in. The ball is preferably fixed to the needle 22 by welding.
  • If the needle 22 rests with the sealing area of its seat part 24 in the needle seat 27, fluid is prevented from flowing into a sack volume 35, which is limited by respective walls of the seat plate 27 and by a sack disc 39, which has a recess 40. On that side of the sack disc 39, which is facing away from the sack volume 35, there is an orifice disc 37, which comprises at least one nozzle 41 through which the fluid can flow out of the valve body 2 from the sack volume 35. The sack disc 39 comprises a sack disc recess 40. The sack disc recess 40 increases the sack volume 35. This offers the possibility to form different sack volume 35 shapes just by changing the sack disc 39. The fluid atomization is strongly dependent on the shape and size of the sack volume 35.
  • It is advantegous for the assembling of the orifice disc 37 and/or the sack disc 39, if the orifice disc 37 and/or the sack disc 39 comprise at least one hole 43 for a dowel pin. To adjust the orifice disc 37 and the sack disc 39, the dowel pin is arranged in the dowel pin hole 43. The orifice disc 37 and the sack disc 39 preferably are laser-welded. They may be also fixed in a different way.
  • It is possible to put multiple sack discs 39a,b,c,d between the orifice disc 37 and the seat plate 27. The multiple sack discs 39a,b,c,d comprise multiple sack disc recesses 40a,b,c,d. This easily increases the possibility of influencing the sack volume 35. Also a plurality of different sack volume 35 shapes and dependent on this different spray atomizations are feasible. The sack disc recesses 40a,b,c,d for example can form a spherical free volume (Figure 2). This embodiment will create turbulences in the fluid, which increases atiomzaion of the fluid. In an other embodiment the sack disc recesses 40a,b,c,d form a conical shaped free Volume (Figure 3) preferably with steps from one sack disc 39a,b,c,d to the other. The corners of the steps create areas of fast fluid flow and also areas of slow fluid flow. At the borders of those areas evolve turbulences in the fluid, which increases fluid atomization.

Claims (6)

  1. Valve body (2) with a needle (22) and a cartridge (21) with a recess (23), which takes in the needle (22) and which comprises on one of its ends a seat plate (27), that comprises a needle seat (29) for the inward opening needle (22), with the needle (22) further comprising a seat-part (24) with a sealing area, that is destined to rest on the needle seat (29), and with at least one sack-disc (39a), which is fixed to the seat plate (27) and which restricts a sack volume (35) in conjunction with the seat plate (27) and the seat part (24) of the needle (22), each sack-disc (39a) comprising a sack-disc recess (40a) in order to modify the sack volume (35), and with an orifice disc (37), which is arranged facing away from the sack volume (35) related to the sack-disc (40a), and with the orifice disc (37) comprising a nozzle (41).
  2. Valve body (2) in accordance with claim 1 with the sack-disc recess (40a) forming a spherical free volume.
  3. Valve body (2) in accordance with one of the preceding claims with the sack-disc recess (40a) forming a conical free volume.
  4. Valve body (2) in accordance with one of the preceding claims with the sack-disc (39a) comprising a dowel pin hole (43).
  5. Valve body (2) in accordance with one of the preceding claims with the sack-disc (39a) and/or the orifice disc (37) being laser welded.
  6. Fluid injector with a housing (1), an actuator unit and a valve body (2) in accordance with one of the preceding claims.
EP20050008192 2005-04-14 2005-04-14 Valve body and fluid injector with a valve body Expired - Fee Related EP1712776B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200560007856 DE602005007856D1 (en) 2005-04-14 2005-04-14 Valve body and liquid injector with valve body
EP20050008192 EP1712776B1 (en) 2005-04-14 2005-04-14 Valve body and fluid injector with a valve body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20050008192 EP1712776B1 (en) 2005-04-14 2005-04-14 Valve body and fluid injector with a valve body

Publications (2)

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EP1712776A1 true EP1712776A1 (en) 2006-10-18
EP1712776B1 EP1712776B1 (en) 2008-07-02

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EP20050008192 Expired - Fee Related EP1712776B1 (en) 2005-04-14 2005-04-14 Valve body and fluid injector with a valve body

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EP (1) EP1712776B1 (en)
DE (1) DE602005007856D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019199838A (en) * 2018-05-17 2019-11-21 愛三工業株式会社 Fuel injection valve
WO2022254981A1 (en) * 2021-06-03 2022-12-08 日立Astemo株式会社 Fuel injection valve

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101074A (en) * 1976-06-17 1978-07-18 The Bendix Corporation Fuel inlet assembly for a fuel injection valve
EP0404407A1 (en) * 1989-06-23 1990-12-27 Lucas Industries Public Limited Company Fuel injection nozzle
US5335864A (en) * 1991-07-17 1994-08-09 Robert Bosch Gmbh Fuel-injection valve
JP2002115628A (en) * 2000-10-10 2002-04-19 Nippon Soken Inc Fuel injection valve and internal combustion engine
US20030164412A1 (en) * 2002-03-04 2003-09-04 Aisan Kogyo Kabushiki Kaisha Orifice plate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4101074A (en) * 1976-06-17 1978-07-18 The Bendix Corporation Fuel inlet assembly for a fuel injection valve
EP0404407A1 (en) * 1989-06-23 1990-12-27 Lucas Industries Public Limited Company Fuel injection nozzle
US5335864A (en) * 1991-07-17 1994-08-09 Robert Bosch Gmbh Fuel-injection valve
JP2002115628A (en) * 2000-10-10 2002-04-19 Nippon Soken Inc Fuel injection valve and internal combustion engine
US20030164412A1 (en) * 2002-03-04 2003-09-04 Aisan Kogyo Kabushiki Kaisha Orifice plate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 08 5 August 2002 (2002-08-05) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019199838A (en) * 2018-05-17 2019-11-21 愛三工業株式会社 Fuel injection valve
WO2022254981A1 (en) * 2021-06-03 2022-12-08 日立Astemo株式会社 Fuel injection valve

Also Published As

Publication number Publication date
EP1712776B1 (en) 2008-07-02
DE602005007856D1 (en) 2008-08-14

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