CN115788726A - Valve for metering fluids - Google Patents

Valve for metering fluids Download PDF

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Publication number
CN115788726A
CN115788726A CN202211103806.4A CN202211103806A CN115788726A CN 115788726 A CN115788726 A CN 115788726A CN 202211103806 A CN202211103806 A CN 202211103806A CN 115788726 A CN115788726 A CN 115788726A
Authority
CN
China
Prior art keywords
valve
throttle bore
injection
filler neck
preparation
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
CN202211103806.4A
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Chinese (zh)
Inventor
N·艾歇尔斯多尔费尔
D·施米德尔
A·吕克特
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 CN115788726A publication Critical patent/CN115788726A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B05B1/3033—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 control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—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 control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—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 control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/3053—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 control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a solenoid
    • 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
    • F02M51/0635—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding
    • F02M51/0642—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto
    • F02M51/0653—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a plate-shaped or undulated armature not entering the winding the armature having a valve attached thereto the valve being an elongated body, e.g. a needle valve
    • 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
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

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

Abstract

A valve (1) for metering fluids, in particular for use as a fuel injection valve for an internal combustion engine, comprises a housing (6), an actuator (2) and a valve needle (15) which can be actuated by the actuator (2) along a longitudinal axis (8) in opposition to a return spring (30). The return spring (30) is supported at least indirectly on the valve needle (15). This arrangement enables actuation of the valve closing body (21) which together with the valve seat surface (22) forms a sealing seat (23). The valve also has an injection-side fluid supply, which is realized by a tubular injection connection (12) forming part of the valve housing (6). According to the invention, the filler neck (12) has a throttle bore (59) in a central region of an internally extending filler channel (54) as viewed in the axial direction along the longitudinal axis (8) of the valve (1).

Description

Valve for metering fluids
Technical Field
The invention relates to a valve for metering a fluid, in particular a fuel injection valve for an internal combustion engine. In particular, the invention relates to the field of injectors for fuel injection systems of motor vehicles, in which direct injection of fuel into a combustion chamber of an internal combustion engine is preferably carried out.
Background
A fuel injection valve for a fuel injection system of an internal combustion engine is known from DE 10 2013 225 834 A1. This known fuel injection valve comprises a valve needle having a valve-closing body which cooperates with a valve seat surface as a sealing seat, and an armature arranged on the valve needle. An adjusting element for adjusting the spring force of the return spring is arranged in the injection channel of the injection nozzle. The sleeve-like adjusting element comprises, on the inside, a filter element for filtering the fluid to be sprayed and a throttle element with a throttle bore having a diameter which is significantly smaller than the diameter of the injection channel running upstream.
Furthermore, a solution is known from US 7,617,991 B2, in which a filter is inserted directly into the inlet of the filler neck of the injection valve on the filler side in the fluid path, in which a disc-shaped throttle element is simultaneously integrated.
Disclosure of Invention
The invention discloses a valve for metering fluid, in particular a fuel injection valve for an internal combustion engine, having a valve housing, an actuator and a valve needle which can be actuated by the actuator along a longitudinal axis against a return spring, wherein the return spring is at least indirectly supported on the valve needle, as a result of which an actuation of a valve closing body which together with a valve seat surface forms a sealing seat can be achieved, and wherein the valve has a fluid feed on the injection side, which is effected by a tubular injection connection which forms part of the valve housing, characterized in that the injection connection, as seen in the axial direction of the longitudinal axis of the valve, has a throttle bore in the central region of an injection channel which extends internally.
In contrast, the valve according to the invention has the advantage that: an improved solution for integrating the throttle bore in the filler opening of the valve is achieved, which is very inexpensive to produce. In a particularly advantageous manner, the throttle bore, as viewed in the axial direction along the longitudinal axis of the valve, is formed centrally or centrally in an injection port of the valve, which injection port forms part of the valve housing. In a particularly advantageous manner, such an injection nozzle can be produced very efficiently and cost-effectively. In particular, a processing machine with six spindles can be used, wherein no additional steps are necessary for the formation and processing of the throttle bore.
The advantageous development of the valve according to the invention is achieved by the measures cited in the preferred embodiments.
It is particularly advantageous if the throttle bore is formed centrally over the axial length of the filler neck, wherein for a central arrangement of the throttle bore within the filler neck it applies that the filler neck has a first length L1 from the injection-side end face of the filler neck to the beginning of the throttle bore, and that a second length L2 is defined from the end of the throttle bore to the end face of the outflow side of the filler neck, wherein L2=0.8-1.6x L1 applies.
Advantageously, an injection channel is provided in the injection nozzle, and the transition of the injection channel upstream and downstream of the throttle bore is in each case configured at an inclination such that a cone angle of the injection channel of approximately 80 ° to 140 ° is present.
Drawings
In the following description preferred embodiments of the present invention are explained in more detail with reference to the appended drawings, in which corresponding elements are provided with consistent reference numerals. The figures show:
fig. 1 shows a valve according to the prior art in a schematic, schematic sectional view;
fig. 2 shows, in a schematic sectional view in a schematic form, the end of the valve on the injection side in a conceivable alternative embodiment;
FIG. 3 shows, in a schematic sectional view in a schematic form, a valve according to an embodiment of the invention, an
Fig. 4 shows a section of the valve, which is designated by IV in fig. 3, or an injection nozzle configured according to the invention.
Detailed Description
Fig. 1 shows a schematic sectional representation of a valve 1 for metering a fluid according to the prior art. The valve 1 can be designed in particular as a fuel injection valve 1. A preferred application is a fuel injection system in which such a fuel injection valve 1 is designed as a high-pressure injection valve and is used for injecting fuel directly into an associated combustion chamber of an internal combustion engine. In particular, the valve 1 is configured for use with a fluid in the liquid state, in particular a liquid fuel, such as gasoline or diesel, or for use with a liquid mixture of at least one fuel.
The valve 1 has an electromagnetic actuator 2 which comprises an electromagnetic coil 3, an armature 4 and an inner pole 5. When the electromagnetic coil 3 is energized, the magnetic circuit via the valve housing 6, the armature 4 and the inner pole 5 is closed, so that the armature 4 is actuated in the opening direction 7 along the longitudinal axis 8 of the valve 1. The valve housing 6 comprises a plurality of housing parts, for example an elongated valve seat support 10, a valve seat body 11 connected to the valve seat support 10 and an upstream filler neck 12.
The armature 4 is arranged on the valve needle 15, wherein in this configuration a floating bearing of the armature 4 on the valve needle 15 is realized. For this purpose, on the one hand, an upper first stop element 16 is provided on the valve needle 15, which is arranged in a stationary manner on the valve needle 15. The stop element 16 can be fixedly connected to the valve needle 15, for example by means of a weld seam on the valve needle 15 or by pressing on the valve needle 15. On the other hand, a lower second stop element 17 is provided, which is introduced into the valve housing 6 independently of the valve needle 15. The second stop element 17 is embodied in the form of a disk, can be introduced into the valve housing 6 in the flow direction of the fluid, and is attached without material to the valve housing 6, in particular to a shoulder 18 of the valve seat support 10. The stop elements 16, 17 are arranged on the valve needle 15 or on the valve housing 6 in such a way that an armature free travel 20 between the stop elements 16, 17 is predetermined for the armature 4.
In the initial state, the armature 4 rests against the lower second stop element 17. When the armature 4 is actuated, the armature 4 first moves through the armature free travel 20 until the armature 4 strikes the upper first stop element 16. The armature 4 then carries the valve needle 15 in the opening direction 7. Thus, there is a larger opening pulse for use in order to open the valve 1. When the valve 1 is opened, the valve closing body 21 connected to the valve needle 15 is lifted from the valve seat surface 22 formed on the valve seat body 11, so that the sealing seat 23 formed between the valve closing body 21 and the valve seat surface 22 is opened. Fluid, in particular fuel, can then be injected from the internal chamber 24 of the valve housing 6 through the injection openings 25 provided in the valve seat body 11 into a chamber 27, in particular a combustion chamber 27 of an internal combustion engine.
When the valve 1 is opened, the armature 4 then strikes the lower stop surface 28, in which configuration the lower stop surface 28 is formed on the inner electrode 5. The stop surface 28 limits the movement of the armature 4 relative to the valve housing 6. To close the valve 1, the solenoid 3 is switched on without current, so that the valve needle 15 is set back into the initial position shown in fig. 1 by the return spring 3. In the closed state, the initial position of the armature 4, which is shown in fig. 1, is ensured by the armature free travel spring 31, in which the armature 4 rests against the stop surface of the lower stop element 17.
Thus, the valve needle 15 can be operated by the actuator 2 against the force of the return spring 30 in order to open the valve 1. The guidance of the valve needle 15 takes place when the valve 1 is opened and subsequently closed. The upper guidance of the valve needle 15 can take place here by means of an upper stop element 16 (which is provided, for example, with a spherical outer contour), while the lower guidance of the valve needle 15 can be realized by suitable guidance structures in the valve seat body 11.
An adjusting element 55 is arranged in an injection channel 54 extending along the longitudinal axis 8 through the injection nozzle 12. The return spring 30 is supported with its upper end on an adjusting element 55, so that the adjusting element 55 serves to adjust the spring force of the return spring 30. Furthermore, the return spring 30 is supported with its lower end by means of a support element 58 on the upper stop element 16 and thus on the valve needle 15. Furthermore, the sleeve-like adjusting element 55 comprises a filter element 56 for filtering the fluid to be injected and a throttle element 57 having a throttle bore 59, the throttle bore 59 having a diameter which is significantly smaller than the diameter of the upstream-extending injection channel 54.
In particular in high-pressure injection valves which are supplied, for example, with a fuel pressure of >100 bar, it has been shown that significant noise generation occurs during operation, which can sometimes be perceived as disturbing. This results in an effective noise reduction: in the injection region of the valve 1, a throttle bore 59 is provided, which has a small opening cross section. By means of the throttle bore 59, pressure pulsations in the interior of the valve, in particular of the fuel injection valve, can be specifically suppressed.
Fig. 2 shows the injection-side end of the valve 1 in a schematic sectional view in a schematic form in a conceivable alternative embodiment. In this embodiment, the throttle bore 59 is integrated directly in the upstream filler neck 12, to be precise in the upstream end region of the filler neck 12, also above a sealing ring 61, which sealing ring 61 serves to seal the valve 1 against a connecting neck ("rail cup") of the filler pipe or the dispensing pipe, said sealing ring being mounted on the outer circumference of the filler neck 12. In such an embodiment, the fluid to be discharged flows directly into the valve through the throttle bore 59 of the filler neck 12. An additional throttle element 57, which is integrated in the adjusting element 55 as in fig. 1, can be dispensed with. However, the formation of such a throttle bore 59 at this point is complicated and complicated with regard to the use of the machining tool.
Fig. 3 shows a schematic sectional illustration in a schematic manner in the form of a schematic diagram of a valve 1 according to an exemplary embodiment of the present invention, having a filler neck 12 configured according to the present invention.
Fig. 4 shows the section of the valve 1 marked IV in fig. 3 or the filler neck 12 formed according to the invention as a single component. According to the invention, the filler neck 12 is characterized in that it has a throttle bore 59 centrally, as viewed in the axial direction along the longitudinal axis 8 of the valve 1, in the central region, in particular as viewed over the axial length of the filler neck 12. The injection channel 54 has a diameter of approximately 1.5mm upstream of the throttle bore 59 in the interior of the filler neck 12, while the injection channel 54 has a diameter of approximately 2.5mm downstream of the throttle bore 59 in the interior of the filler neck 12. Starting from the injection channel 54 upstream of the throttle bore 59, the throttle bore 59 tapers to a diameter of approximately 0.4 mm. Throttle bore 59 may also have a diameter within 1mm, depending on the design. The axial length of the throttle bore 59 is for example between 1.4mm and 2.4 mm. The transition of the injection channel 54 upstream and downstream of the throttle bore 59 is in each case formed obliquely such that a cone angle α of approximately 80 ° to 140 ° of the injection channel 54 is present.
In a particularly advantageous manner, such an injection nozzle 12 can be produced very efficiently and cost-effectively. In particular, a processing machine with six spindles can be used, wherein no additional steps are necessary for forming and processing the throttle bore 59. For a central arrangement of the throttle bore 59 inside the filler neck 12, it should ideally be possible for the filler neck 12 to have a first length L1 from the filler-side end 65 of the filler neck 12 to the beginning of the throttle bore 59, and for a second length L2 to be located from the end of the throttle bore 59 to the outflow-side end 66 of the filler neck 12, wherein L2=0.8-1.6 × L1 is suitable.
The invention is not limited to the exemplary embodiments shown and can also be implemented in a large number of other types of structures of fuel injection valves compared to the embodiment of the fuel injection valve shown in fig. 3.

Claims (7)

1. Valve (1) for metering a fluid, in particular a fuel injection valve for an internal combustion engine, having a valve housing (6), an actuator (2) and a valve needle (15), which can be actuated by the actuator (2) along a longitudinal axis (8) against a return spring (30), wherein the return spring (30) is supported at least indirectly on the valve needle (15), as a result of which an actuation of a valve closing body (21), which together with a valve seat surface (22) forms a sealing seat (23), can be achieved, and having a fluid supply on the injection side, which is achieved by a tubular filler neck (12) which forms part of the valve housing (6),
it is characterized in that the preparation method is characterized in that,
the filler neck (12) has a throttle bore (59) in the central region of an internally extending filler channel (54), as seen in the axial direction along the longitudinal axis (8) of the valve (1).
2. The valve as set forth in claim 1, wherein,
it is characterized in that the preparation method is characterized in that,
the throttle bore (59) is shaped centrally as seen in the axial length of the filler neck (12), wherein for a central arrangement of the throttle bore (59) within the filler neck (12), it applies that the filler neck (12) has a first length L1 from a filler-side end side (65) of the filler neck (12) to the beginning of the throttle bore (59), and that a second length L2 is defined from the end of the throttle bore (59) to an end side (66) of the filler neck (12), wherein L2=0.8-1.6x L1.
3. The valve according to claim 1 or 2,
it is characterized in that the preparation method is characterized in that,
the injection channel (54) has a diameter upstream of the throttle bore (59) within the injection nozzle (12) that is smaller than a diameter of the injection channel (54) downstream of the throttle bore (59) within the injection nozzle (12).
4. The valve according to claim 1 or 2 or 3,
it is characterized in that the preparation method is characterized in that,
the throttle bore (59) has a smaller diameter upstream and downstream of the throttle bore (59) than the injection channel (54) inside the injection nozzle (12).
5. The valve according to claim 3 or 4,
it is characterized in that the preparation method is characterized in that,
the injection channel (54) has a diameter of approximately 1.5mm upstream of the throttle bore (59) inside the injection nozzle (12), while the injection channel (54) has a diameter of approximately 2.5mm downstream of the throttle bore (59) inside the injection nozzle (12).
6. The valve according to any one of the preceding claims,
it is characterized in that the preparation method is characterized in that,
the throttle bore (59) has a diameter of about 0.4 to 1 mm.
7. The valve of claim 3, 4 or 5,
it is characterized in that the preparation method is characterized in that,
the transition of the injection channel (54) upstream and downstream of the throttle bore (59) is in each case configured at an inclination such that a cone angle (a) of the injection channel (54) of approximately 80 DEG to 140 DEG is present.
CN202211103806.4A 2021-09-09 2022-09-09 Valve for metering fluids Pending CN115788726A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021209948.3 2021-09-09
DE102021209948.3A DE102021209948A1 (en) 2021-09-09 2021-09-09 Valve for metering a fluid

Publications (1)

Publication Number Publication Date
CN115788726A true CN115788726A (en) 2023-03-14

Family

ID=85226299

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211103806.4A Pending CN115788726A (en) 2021-09-09 2022-09-09 Valve for metering fluids

Country Status (2)

Country Link
CN (1) CN115788726A (en)
DE (1) DE102021209948A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7617991B2 (en) 2006-03-31 2009-11-17 Delphi Technologies, Inc. Injector fuel filter with built-in orifice for flow restriction
DE102013225834A1 (en) 2013-12-13 2015-06-18 Robert Bosch Gmbh Fuel injector

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DE102021209948A1 (en) 2023-03-09

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