EP0438162A1 - Control valve - Google Patents

Control valve Download PDF

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Publication number
EP0438162A1
EP0438162A1 EP91100570A EP91100570A EP0438162A1 EP 0438162 A1 EP0438162 A1 EP 0438162A1 EP 91100570 A EP91100570 A EP 91100570A EP 91100570 A EP91100570 A EP 91100570A EP 0438162 A1 EP0438162 A1 EP 0438162A1
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EP
European Patent Office
Prior art keywords
control valve
low
guide part
control
pressure
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
EP91100570A
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German (de)
French (fr)
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EP0438162B1 (en
Inventor
Reda Rizk
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.)
Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6398357&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0438162(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Priority to DE9191100570T priority Critical patent/DE59100209D1/en
Publication of EP0438162A1 publication Critical patent/EP0438162A1/en
Application granted granted Critical
Publication of EP0438162B1 publication Critical patent/EP0438162B1/en
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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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • 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
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
    • F02M59/46—Valves
    • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
    • 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
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion

Definitions

  • Control valves of this type have the advantage that they close absolutely tight and are largely balanced. That is why they are suitable for quick actuation using appropriately designed electromagnets.
  • the control valve consists of a control valve sleeve (1) in which a rotationally symmetrical control valve body (2) is sealingly guided.
  • the guidance is effected by a high-pressure guide part (6) and a low-pressure guide part (7).
  • the high-pressure guide part (6) has the diameter of the control valve seat (3), the diameter of the low-pressure guide part (7) is smaller according to the width of the control valve seat.

Landscapes

  • 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)
  • Details Of Valves (AREA)
  • Lift Valve (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

2.1 The invention relates to a control valve for controlling a high pressure line, preferably an injection line for diesel internal combustion engines. A disadvantage of these control valves is that the flow, when being reduced, breaks down behind the control valve seat, tending to cavitation. The object of the invention is to prevent cavitation in the reducing area of the control valve and thereby to increase the lifespan of the control valve. 2.2 According to the invention the object is met in that the reducing area (8) has a constriction (9) which begins on the outlet of a control valve seat (3) and runs out into a low pressure control section (7). <IMAGE>

Description

Die Erfindung betrifft ein Steuerventil zum Steuern einer Hochdruckleitung, insbesondere nach dem Oberbegriff des Anspruchs 1.The invention relates to a control valve for controlling a high-pressure line, in particular according to the preamble of claim 1.

In der DE-OS 3302294 ist ein gattungsgemäßes Steuerventil beschrieben, das zur Steuerung der Einspritzung von Dieselbrennkraftmaschinen Verwendung findet. Es weist eine Steuerventilbüchse und einen als drehsymmetrischen Kolbenschieber ausgebildeten Steuerventilkörper auf, an dem ein konischer Steuerventilsitz angeordnet ist, über den eine Hochdruckbohrung mit einer Niederdruckbohrung verbindbar ist, und bei dem ein zylindrisches Hochdruckführungsteil und zylindrisches Niederdruckführungsteil mit dazwischen liegendem Absteuerbereich vorgesehen sind, wobei der Durchmesser des Absteuerbereichs zumindest teilweise kleiner als der Durchmesser des Niederdruckführungsteils ist.DE-OS 3302294 describes a generic control valve which is used to control the injection of diesel internal combustion engines. It has a control valve sleeve and a control valve body designed as a rotationally symmetrical piston slide, on which a conical control valve seat is arranged, via which a high-pressure bore can be connected to a low-pressure bore, and in which a cylindrical high-pressure guide part and cylindrical low-pressure guide part with an intermediate control region are provided, the diameter of the control area is at least partially smaller than the diameter of the low-pressure guide part.

Steuerventile dieser Art haben den Vorteil, daß sie absolut dicht schließen und weitgehend ausgeglichen sind. Deshalb eignen sie sich zum raschen Betätigen durch entsprechend ausgelegte Elektromagnete.Control valves of this type have the advantage that they close absolutely tight and are largely balanced. That is why they are suitable for quick actuation using appropriately designed electromagnets.

Nachteilig an diesen Steuerventilen ist, daß die Strömung beim Absteuern hinter dem Steuerventilsitz im Absteuerbereich abreißt und zu Kavitation neigt. Dadurch kann der hohlgebohrte Steuerventilkörper angegriffen und schließlich zerstört werden.A disadvantage of these control valves is that the flow breaks off behind the control valve seat in the control area when the valve is turned off and tends to cavitate. This can attack the hollow drilled control valve body and eventually destroy it.

Der Erfindung liegt die Aufgabe zugrunde, die Kavitation im Absteuerbereich des Absteuerventilkörpers zu vermeiden und dadurch die Lebensdauer des Steuerventiles zu erhöhen.The invention has for its object to avoid cavitation in the control region of the control valve body and thereby increase the life of the control valve.

Die Aufgabe wird erfindungsgemäß durch den kennzeichnenden Teil des Anspruchs 1 gelöst. Durch die Einschnürung im Absteuerbereich des Steuerventilkörpers wird der Kraftstoff beim Öffnen des Steuerventils im Anschluß an den Steuerventilsitz umgelenkt, so daß die Strömung nicht abreißt sondern anliegt. Dadurch wird Hohlraumbildung mit Kavitationsfolge vermieden und eine ungestörte, widerstandsarme Strömung gewährleistet.The object is achieved by the characterizing part of claim 1. The constriction in the control region of the control valve body causes the fuel to be deflected when the control valve is opened following the control valve seat, so that the flow does not stop but is present. This avoids cavitation with a sequence of cavitation and ensures an undisturbed, low-resistance flow.

Durch eine vorteilhafte Weiterbildung der Erfindung wird eine besonders einfach zu fertigende Form des Absteuerbereichs erzielt. Dieser Aspekt ist im Hinblick auf die geringen Abmessungen des Steuerventilkörpers besonders wichtig.An advantageous further development of the invention achieves a particularly simple shape of the control region. This aspect is particularly important in view of the small dimensions of the control valve body.

Durch eine vorteilhafte Gestaltung des Absteuerbereiches des Steuerventilkörpers wird eine besonders wirksame und trotzdem sanfte Umlenkung des abgesteuerten Kraftstoffes bei nur geringer Einschnürung des Absteuerbereiches erreicht. Optimale Verhältnisse bilden sich heraus, wenn der sich an den Steuerventilsitz anschließende Radius den Steuerventilsitz tangiert.Through an advantageous design of the control area of the control valve body, a particularly effective and yet gentle deflection of the controlled fuel is achieved with only a small constriction of the control area. Optimal conditions are formed when the radius adjoining the control valve seat touches the control valve seat.

Eine besonders interessante Weiterbildung der Erfindung gestattet eine optimale Fertigung des Steuerventilkörpers auf NC-Maschinen. Außerdem bewirkt eine parabelförmige Kontur des Absteuerbereichs eine besonders wirkungsvolle und zugleich schonende Umlenkung des Kraftstoffstromes, die Kavitation mit Sicherheit ausschließt. Auch bei dieser Lösung liegt das Strömungsoptimum bei tangentialem Anschluß der parabelförmigen Kontur an den Steuerventilsitz.A particularly interesting development of the invention allows optimal manufacture of the control valve body on NC machines. In addition, a parabolic contour of the control area causes a particularly effective and, at the same time, gentle redirection of the fuel flow, which reliably prevents cavitation. In this solution, too, the flow is optimal when the parabolic contour is tangentially connected to the control valve seat.

Weitere Merkmale der Erfindung gehen aus der folgenden Beschreibung und der Zeichnung hervor, in der ein Ausführungsbeispiel der Erfindung schematisch dargestellt ist.Further features of the invention will become apparent from the following description and the drawing, in which an embodiment of the invention is shown schematically.

Die Figur zeigt:
einen Schnitt durch die Steuerventilbüchse (1) mit Steuerventilkörper (2).The figure shows:
a section through the control valve sleeve (1) with the control valve body (2).

Das Steuerventil besteht aus einer Steuerventilbüchse (1), in der ein drehsymmetrischer Steuerventilkörper (2) dichtend geführt ist. Die Führung wird bewirkt durch einen HochdrucKführungsteil (6) und einen NiederdrucKführungsteil (7). Der Hochdruckführungsteil (6) hat den Durchmesser des Steuerventilsitzes (3), der Durchmesser des Niederdruckführungsteils (7) ist entsprechend der Breite des Steuerventilsitzes kleiner.The control valve consists of a control valve sleeve (1) in which a rotationally symmetrical control valve body (2) is sealingly guided. The guidance is effected by a high-pressure guide part (6) and a low-pressure guide part (7). The high-pressure guide part (6) has the diameter of the control valve seat (3), the diameter of the low-pressure guide part (7) is smaller according to the width of the control valve seat.

Zwischen Hoch- und Niederdruckführungsteil befindet sich der Absteuerbereich (8), der eine Einschnürung (9) aufweist. In Strömungsrichtung oberhalb des Steuerventilsitzes (3) sind in der Steuerventilbüchse (1) eine Hochdruckbohrung (4) und ein Hochdruckringraum (10) vorgesehen, in Strömungsrichtung nach dem Steuerventilsitz (3) eine Niederdruckbohrung (5) und ein Niederdruckringraum (11).The control region (8), which has a constriction (9), is located between the high and low pressure guide part. A high pressure bore (4) and a high pressure annulus (10) are provided in the control valve sleeve (1) in the flow direction above the control valve seat (3), and a low pressure bore (5) and a low pressure annulus (11) in the flow direction after the control valve seat (3).

Am niederdruckseitigen Ende des Steuerventilkörpers (2) ist ein Steuermagnetanschluß (12) angeordnet, an den ein nicht dargestellter Steuermagnet angreift.At the low-pressure end of the control valve body (2) there is a control magnet connection (12), to which a control magnet (not shown) engages.

Das Steuerventil funktioniert folgendermaßen:
Wenn der Steuermagnet den Steuerventilkörper (2) auf den Steuerventilsitz (3) zieht, sind Hochdruckbohrung (4) und Niederdruckbohrung (5) getrennt, so daß sich in der Hochdruckbohrung (4) Druck aufbauen Kann. Bei einer Dieselbrennkraftmaschine beginnt dann die Einspritzung des Kraftstoffes, der von der nicht dargestellten Einspritzpumpe über die Hochdruckleitung (4) und die nicht dargestellte Einspritzleitung zum nicht dargestellten Einspritzventil in den Brennraum gefördert wird.The control valve works as follows:
When the control magnet pulls the control valve body (2) onto the control valve seat (3), the high pressure bore (4) and the low pressure bore (5) are separated so that pressure can build up in the high pressure bore (4). In the case of a diesel internal combustion engine, the fuel is then injected, which is fed into the combustion chamber by the injection pump (not shown) via the high-pressure line (4) and the injection line (not shown) to the injection valve (not shown).

Sobald der Steuermagnet den Steuerventilkörper (2) freigibt, wird dieser durch eine nicht dargestellte Feder vom Steuerventilsitz (3) abgehoben. Sogleich schießt der hochgespannte Kraftstoff entlang des Steuerventilsitzes (3) in den Absteuerbereich (8), wo er entlang der Einschnürung (9) sanft und ohne Strömungsabriß in Richtung Niederdruckbohrung (5) umgelenkt wird. In dieser Kritischen Strömungsphase mit hoher Strömungsgeschwindigkeit und niedrigem Druck besteht akute Kavitationsgefahr durch Strömungsabriß. Diese Gefahr wird durch die strömungsgünstige Einschnürung (9) gebannt. Dadurch bildet sich eine störungs- und abrißfreie Strömung, durch die Kavitationsschäden erfindungsgemäß vermieden und die Lebensdauer des Steuerventils entscheidend erhöht werden.As soon as the control magnet releases the control valve body (2), it is lifted off the control valve seat (3) by a spring (not shown). Immediately the high-tension fuel shoots along the control valve seat (3) in the control area (8), where it is gently diverted along the constriction (9) and without stall in the direction of the low-pressure bore (5). In this critical flow phase with high flow speed and low pressure, there is an acute risk of cavitation due to stall. This danger is eliminated by the streamlined constriction (9). This creates a flow that is free of interruptions and breaks, by which cavitation damage is avoided according to the invention and the service life of the control valve is decisively increased.

Claims (4)

Steuerventil zum Steuern einer Hochdruckleitung, vorzugsweise einer Einspritzleitung für Dieselbrennkraftmaschinen, wobei das Steuerventil eine Steuerventilbuchse (1) und einen als drehsymmetrischen Kolbenschieber ausgebildeten Steuerventilkörper (2) aufweist, an dem ein konischer Steuerventilsitz (3) angeordnet ist, über den eine Hochdruckbohrung (4) mit einer Niederdruckbohrung (5) verbindbar ist, und bei dem ein zylindrisches Hochdruckführungsteil (6) und ein zylindrisches Niederdruckführungsteil (7) mit dazwischen liegendem Absteuerbereich (8) vorgesehen sind, wobei der Durchmesser des Absteuerbereichs (8) zumindest teilweise kleiner als der Durchmesser des Niederdruckführungsteils (7) ist,
dadurch gekennzeichnet, daß der Absteuerbereich (8) eine Einschnürung (9) aufweist, die am Auslauf des Steuerventilsitzes (3) beginnt und in das Niederdruckführungsteil (7) ausläuft.Control valve for controlling a high-pressure line, preferably an injection line for diesel internal combustion engines, the control valve having a control valve bushing (1) and a control valve body (2) designed as a rotationally symmetrical piston slide, on which a conical control valve seat (3) is arranged, via which a high-pressure bore (4) with a low-pressure bore (5), and in which a cylindrical high-pressure guide part (6) and a cylindrical low-pressure guide part (7) with intermediate control area (8) are provided, the diameter of the control area (8) being at least partially smaller than the diameter of the Low pressure guide part (7),
characterized in that the control region (8) has a constriction (9) which begins at the outlet of the control valve seat (3) and ends in the low-pressure guide part (7). Steuerventil nach Anspruch 1,
dadurch gekennzeichnet, daß die Kontur der Einschnürung (9) eine Kreisbogenform aufweist.Control valve according to claim 1,
characterized in that the contour of the constriction (9) has a circular arc shape. Steuerventil nach Anspruch 1,
dadurch gekennzeichnet, daß die Kontur der Einschnürung (9) sich aus mehreren Kreisbögen von steigendem Durchmesser zusammensetzt, wobei sich der kleinste Kreisbogen an den Steuerventilsitz (3) anschließt und der größte in das NiederdrucKführungsteil (7) ausläuft und wobei alle Kreisbögen kontinuierlich ineinander übergehen.Control valve according to claim 1,
characterized in that the contour of the constriction (9) is composed of a plurality of circular arcs of increasing diameter, the smallest circular arc adjoining the control valve seat (3) and the largest ending in the low-pressure guide part (7), and all circular arcs continuously merging into one another. Steuerventil nach Anspruch 1,
dadurch gekennzeichnet, daß die Kontur der Einschnürung (9) eine Parabelform aufweist, wobei sich der kleinste Krümmungskreis der Parabel an den Steuerventilsitz (3) anschließt und der größte in das Niederdruckführungsteil (7) ausläuft.Control valve according to claim 1,
characterized in that the contour of the constriction (9) has a parabolic shape, the smallest circle of curvature of the parabola adjoining the control valve seat (3) and the largest ending in the low-pressure guide part (7).
EP19910100570 1990-01-19 1991-01-18 Control valve Revoked EP0438162B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9191100570T DE59100209D1 (en) 1991-01-18 1991-01-18 CONTROL VALVE.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904001435 DE4001435A1 (en) 1990-01-19 1990-01-19 CONTROL VALVE

Publications (2)

Publication Number Publication Date
EP0438162A1 true EP0438162A1 (en) 1991-07-24
EP0438162B1 EP0438162B1 (en) 1993-07-28

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ID=6398357

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910100570 Revoked EP0438162B1 (en) 1990-01-19 1991-01-18 Control valve

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EP (1) EP0438162B1 (en)
DE (1) DE4001435A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999019622A1 (en) * 1997-10-13 1999-04-22 Daimlerchrysler Ag Electrically controlled valve
EP1335128A2 (en) * 2002-02-08 2003-08-13 Robert Bosch Gmbh High pressure hydraulic valve, in particularly for an internal combustion engine fuel injection apparatus

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE520187C (en) * 1929-05-02 1931-03-09 Edmund Augustin Valve
US2237554A (en) * 1938-07-05 1941-04-08 Marvin H Grove Valve construction
DE1284208B (en) * 1967-05-23 1968-11-28 Sulzer Ag Throttle valve
CH489707A (en) * 1968-04-18 1970-04-30 Sulzer Ag Control valve of a fuel injection pump
DE3302294A1 (en) * 1983-01-25 1984-07-26 Klöckner-Humboldt-Deutz AG, 5000 Köln FUEL INJECTION DEVICE FOR AIR COMPRESSING, SELF-IGNITIONING INTERNAL COMBUSTION ENGINES
GB2168130A (en) * 1984-11-30 1986-06-11 Lucas Ind Plc Electromagnetically operable valve
WO1988009868A1 (en) * 1987-06-13 1988-12-15 Robert Bosch Gmbh Fuel injection pump
EP0178427B1 (en) * 1984-09-14 1990-12-27 Robert Bosch Gmbh Electrically controlled fuel injection pump for internal combustion engines

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1606426A (en) * 1925-09-10 1926-11-09 Joseph J Justen Air valve for hoists
US2747612A (en) * 1951-04-24 1956-05-29 Research Corp Force-compensated flow valve
FR2389021A1 (en) * 1977-04-27 1978-11-24 Case Co J I Load handling equipment hydraulic control circuit - has safety valve with closing piston operated by two sensors in series
DE2827724A1 (en) * 1978-06-22 1980-01-03 Siemens Ag HYDRAULIC DRIVE WITH AT LEAST TWO REVERSIBLE PISTON-CYLINDER ARRANGEMENTS

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE520187C (en) * 1929-05-02 1931-03-09 Edmund Augustin Valve
US2237554A (en) * 1938-07-05 1941-04-08 Marvin H Grove Valve construction
DE1284208B (en) * 1967-05-23 1968-11-28 Sulzer Ag Throttle valve
CH489707A (en) * 1968-04-18 1970-04-30 Sulzer Ag Control valve of a fuel injection pump
DE3302294A1 (en) * 1983-01-25 1984-07-26 Klöckner-Humboldt-Deutz AG, 5000 Köln FUEL INJECTION DEVICE FOR AIR COMPRESSING, SELF-IGNITIONING INTERNAL COMBUSTION ENGINES
EP0178427B1 (en) * 1984-09-14 1990-12-27 Robert Bosch Gmbh Electrically controlled fuel injection pump for internal combustion engines
GB2168130A (en) * 1984-11-30 1986-06-11 Lucas Ind Plc Electromagnetically operable valve
WO1988009868A1 (en) * 1987-06-13 1988-12-15 Robert Bosch Gmbh Fuel injection pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999019622A1 (en) * 1997-10-13 1999-04-22 Daimlerchrysler Ag Electrically controlled valve
EP1335128A2 (en) * 2002-02-08 2003-08-13 Robert Bosch Gmbh High pressure hydraulic valve, in particularly for an internal combustion engine fuel injection apparatus
EP1335128A3 (en) * 2002-02-08 2004-10-20 Robert Bosch Gmbh High pressure hydraulic valve, in particularly for an internal combustion engine fuel injection apparatus

Also Published As

Publication number Publication date
EP0438162B1 (en) 1993-07-28
DE4001435A1 (en) 1991-07-25

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