DE2221929B1

DE2221929B1 - HYDRAULIC PRESSURE REGULATOR WITH ELECTROMAGNETIC ACTUATOR

Info

Publication number: DE2221929B1
Application number: DE19722221929
Authority: DE
Inventors: Herbert Veh
Original assignee: Elektroteile GmbH Oberuhldingen
Current assignee: ETO Gruppe Technologies GmbH
Priority date: 1972-05-04
Filing date: 1972-05-04
Publication date: 1973-08-23

Description

Das zylindrische Polrohr besteht, wie die Ankerkugel selbst, in seinem oberen Teil 2 und in seinem The cylindrical pole tube, like the anchor ball itself, consists in its own upper part 2 and in his

unteren Teil ' aus weichmagnetischem Material, wobei die Teile 2 und 2' durch ein Rohrstück o" aus unmagnetischem Material, wie z. B. Messing, verbunden sind.lower part 'made of soft magnetic material, the parts 2 and 2 'by a piece of pipe o "made of non-magnetic material, such as brass are.

In das untere Polstück 6 ist ein mittleres Zuführungsrohr 3 eingesetzt, welches das Druckmittel in den Ankerraum zuführt und an seinem oberen Ende die Einströmdüse 8 bildet, welche von der Ankerkugell verschlossen oder mehr oder weniger geöffnet werden kann. Das zugeführte Druckmittel strömt in Pfeilrichtung durch mehrere Ausflußkanäle aus dem Ankerraum aus und gelangt so in den Rücklauf des hydraulischen oder pneumatischen Systems. A central feed pipe 3 is inserted into the lower pole piece 6, which feeds the pressure medium into the armature space and the inlet nozzle at its upper end 8 forms, which are closed or more or less opened by the anchor ball can be. The supplied pressure medium flows in the direction of the arrow through several outflow channels out of the armature chamber and thus enters the return of the hydraulic or pneumatic Systems.

Der Hub des Kugelankers 1 wird nach oben durch die Anschlagsehraube 9 begrenzt, die zugleich als Entlüftungsschraube dienen kann, um den Ankerraum im Bedarfsfalle druckfrei zu machen. The stroke of the ball anchor 1 is upward through the stop screw 9 limited, which can also serve as a vent screw to remove the anchor space in the If necessary, to make pressure-free.

Die Einströmdüse 8 besteht aus unmagnetischem Material. Die obere Stirnfläche des Polstückes 6 bildet mit der Ankerkugel 1 einen kalottenförmigen Ringspalt. wobei die Form der Stirnfläche 10 des Polstückes 6 so gestaltet werden kann, daß die gewünschte Strom-Druck-Kennlinie erzielt wird. Die Abmessungen sind so gewählt, daß, wenn die Ankerkugel 1 die Einströmdüse 8 verschließt, sie mit ihrem Äquator noch die Innenwand des weichmagnetischen Polrohrstückes 2 berührt. Der zwischen Ankerkugel 1 und Polfläche 10 gebildete Ringspalt ist umgeben von dem aus unmagnetischem Material bestehenden Polrohrstück 2". The inlet nozzle 8 consists of a non-magnetic material. The upper The end face of the pole piece 6 forms a dome-shaped with the anchor ball 1 Annular gap. wherein the shape of the end face 10 of the pole piece 6 can be designed can that the desired current-pressure characteristic is achieved. The dimensions are chosen so that when the anchor ball 1 closes the inlet nozzle 8, they with their Equator still touches the inner wall of the magnetically soft pole tube piece 2. The between Armature ball 1 and pole face 10 formed annular gap is surrounded by the non-magnetic Material existing pole tube piece 2 ".

Der beschriebene Druckregler arbeitet wie folgt: Der in Fig. 1 dargestellten Anlage wird aus einer Pumpe mit konstantem Förderdruck in der Leitung 4 das Druckmittel über eine fest eingestellte Düse 7 zugeführt. Nach Art einer hydraulischen Halbbrücke ist der festen Düse 7 die durch die Ankerkugel 1 veränderliche Einströmdüse 8 nachgeschaltet, wobei zwischen diesen beiden Düsen in der Leitung 5 der Arbeitskolben 11 angeschlossen ist, der in der gewünschten Weise mit veränderlichem Druck betrieben werden soll. Ist die veränderliche Einströmdüse 8 ganz geöffnet, so ist die Leitung 5 zwischen den beiden Düsen druckfrei; wenn die Einströmdüse 8 durch die Ankerkugel 1 ganz geschlossen ist. The pressure regulator described works as follows: The one shown in FIG The system becomes the pressure medium from a pump with constant delivery pressure in line 4 supplied via a fixed nozzle 7. In the manner of a hydraulic half-bridge If the fixed nozzle 7 is followed by the inflow nozzle 8, which can be changed by the armature ball 1, the working piston 11 being connected between these two nozzles in the line 5 which is to be operated in the desired manner with variable pressure. If the variable inlet nozzle 8 is fully open, the line 5 is between the two nozzles pressure-free; when the inlet nozzle 8 through the anchor ball 1 all the way closed is.

tritt am Arbeitszylinder 11 der volle Speisedruck auf.occurs at the working cylinder 11, the full feed pressure.

Die Verhältnisse sind so gewählt daß bei vollerregtem Nlagnet die Ankerkugel 1 an der Einström- düse 8 anliegt und diese schließt. Wird der Erregerstrom vermindert, so wird sich zwischen der auf die Ankerkugel 1 einwirkenden Magnetkraft und dem durch die Zuführungsleitung 3 einwirkenden Druck des Strömungsmittels bei einer bestimmten Größe des Ringspaltes ein Gleichgewichtszustand einstellen. The conditions are chosen so that when the Nlagnet is fully rainy Anchor ball 1 on the inflow nozzle 8 is applied and this closes. Will the excitation current is reduced, between the magnetic force acting on the armature ball 1 and the pressure of the fluid acting through the supply line 3 set a state of equilibrium to a certain size of the annular gap.

welchem der gewünschte Druck in der Leitung 5 entspricht. Zwischen der Größe des Erregerstromes und dem so erzeugten Druck in der Leitung 5 besteht somit eine funktionelle Abhängigkeit im Sinne der gewünschten Regelung. Bei senkrechter Lage des Stellmagnets geht selbstverständlich auch das Gewicht der Ankerkugell in die das Gleichgewicht bestimmenden Kräfte ein.to which the desired pressure in line 5 corresponds. Between the size of the excitation current and the pressure generated in this way in the line 5 thus a functional dependency in terms of the desired regulation. With vertical Of course, the position of the solenoid is also influenced by the weight of the armature ball the forces that determine the balance.

Für die gewünschte Veränderung der Einströmdüse 8 genügt ein äußerst geringer Hub der Ankerkugel 1. Demgemäß kann der Druckregler mit sehr kleinen elektrischen Leistungen betrieben werden. For the desired change in the inlet nozzle 8, one is extremely sufficient low stroke of the armature ball 1. Accordingly, the pressure regulator with very small electrical Services are operated.

Die Ausführungsform nach F i g. 2 unterscheidet sich von der Ausführung nach Fig. 1 lediglich in baulicher Hinsicht. Nach F i g. 2 sind die Kanäle und5, ebenso wie der Rücklaufkanal und die feste Drossel 7 in einem Anschlußblock untergebracht, der unmittelbar an die untere Jochplatte des Elektromagnets angeschlossen ist. Im übrigen bestehen keine wesentlichen Abweichungen gegenüber der Fig. 1. The embodiment according to FIG. 2 differs from the execution according to Fig. 1 only in structural terms. According to FIG. 2 are the channels and 5, as well as the return duct and the fixed throttle 7 housed in a connection block, which is directly connected to the lower yoke plate of the electromagnet. in the Otherwise there are no significant deviations from FIG. 1.

F i g. 3 zeigt schließlich eine Zwillingsanordnung eines Druckreglers mit Kugelanker. die in eine Brükkenanordnung an sich bekannter Art eingebaut werden kann. Hier arbeitet ein gemeinsamer Kugelankerl mit spiegelbildlich angeordneten Magnetsystemen, die je eine Einströmdüse aufweisen. In der Symmetrieebene ist ein magnetischer Rückschluß 32 aus weichmagnetischem Material angeordnet, welcher zugleich ein Teil des Polrohres bildet. Der Kugelanker 1 liegt auf seinem gesamten Hub an der durch das weichmagnetische Stück 32 gebildeten Innenfläche des Polrohres an. Zwischen den weichmagnetischen Teilen 32' des Polrohres und dem mittleren weichmagnetischen Stück 32 sind jeweils Zwischenstücke 32" aus unmagnetischem Material angeordnet. F i g. 3 finally shows a twin arrangement of a pressure regulator with ball anchor. which are installed in a bridge arrangement of a type known per se can. A common ball anchor works here with mirror-inverted ones Magnet systems, each with an inlet nozzle. In the plane of symmetry is a magnetic yoke 32 arranged from soft magnetic material, which at the same time forms part of the pole tube. The ball anchor 1 rests on its entire stroke the inner surface of the pole tube formed by the soft magnetic piece 32. Between the soft magnetic parts 32 'of the pole tube and the middle soft magnetic Piece 32 are arranged in each case intermediate pieces 32 ″ made of non-magnetic material.

In manchen Fällen, z. B. wenn der Druckregler auf Fahrzeugen eingebaut werden soll, kann erfindungsgemäß der Einfluß der Masse des Kugel ankers dadurch vermindert werden. daß der Anker als Hohlkugel ausgebildet wird. In some cases, e.g. B. when the pressure regulator is installed on vehicles is to be, according to the invention, the influence of the mass of the ball anchor be decreased. that the anchor is designed as a hollow sphere.

Claims

Claims: 1. Hydraulic pressure regulator with electromagnetic Actuator in which the armature is acted upon with pressure medium and depending after energizing the solenoid, the inflow opening of the pressure medium more or less closes, characterized by the use of a direct current lifting magnet with a inner pole tube (2) enclosed by the magnet winding, in which 'the' spherical Anchor (1) is guided, which together with a concave end face (10) of a Pole piece (6) forms a dome-shaped air gap in which a centrally arranged Inlet nozzle (8) protrudes and from which the axially parallel in the pole piece (6) going off running outflow channels.

2. Pressure regulator according to claim 1, characterized in that the pole tube (2) consists of soft magnetic material in its two outer parts (2, 2 ') and these two parts by a piece of pipe (2 ") made of non-magnetic material, such as z. B. brass, are connected, and that the anchor ball (1) in which the inlet nozzle (8) closing position with its equator still the inner wall of the upper soft magnetic Part (2) of the pole tube touches.

3. Pressure regulators in twin arrangement with two arranged in mirror image Pressure regulators according to claim 1, characterized in that a common ball anchor (1) cooperates with the inlet nozzles of the two pressure regulators, the pole tube of outer parts (32 ') made of soft magnetic material and intermediate pieces (32 ") is composed of non-magnetic material, between which in the plane of symmetry the arrangement has a magnetic yoke (32) made of soft magnetic material is (Fig. 3).

The invention relates to a hydraulic pressure regulator electromagnetic actuator in which the armature is acted upon with pressure medium and depending on the excitation of the solenoid, the inflow opening of the pressure medium is more or less closes.

One known pressure regulator of this type uses a bell magnet with embedded magnetic coil, whose yoke armature from the side of the bell magnet is acted upon by the pressure medium, the yoke armature through the into the inflow opening engaging closure element centered and its weight through a membrane or Spring is compensated. To ensure a minimal air gap between The yoke armature and the pole faces of the bell magnet are adjustable spacers intended. This known design is therefore not only very expensive in terms of space, but also also complicated in their structure. Another disadvantage is that the yoke anchor Although axially displaceable and mechanically unloaded, friction-free and centered moveable, but not in the axial direction leads is so that he is at one of the Vertical deviating position or can shift during transport. Even in the case of impacts, e.g. B. when the controller is mounted on vehicles Faults or even damage to the device are to be expected.

The invention has set itself the task of avoiding these disadvantages and in particular a pressure regulator with a frictionlessly mounted and guided To create anchor with a much simplified design.

To solve this problem, the invention provides a hydraulic Pressure regulator of the type mentioned the use of a direct current lifting magnet with an inner pole tube enclosed by the magnet winding, in which the spherical anchor is guided, which together with a concave face of a pole piece forms a dome-shaped air gap in which one is centered arranged inlet nozzle protrudes and from which the axially parallel in the pole piece going off running outflow channels.

A pressure regulator designed in this way does not show just one Space-saving and composed of a few parts structure, it is much more very favorable in terms of flow technology and the practically frictionless storage of the anchor is largely independent of position and insensitive to shocks and vibrations.

The use of an anchor ball is known per se, however only with simple solenoid valves that close a hydraulic line or open, d. H. work according to the on-off principle.

Further details of the invention emerge from the subclaims.

In the following description, exemplary embodiments are based on the Drawing explained. In the drawing, FIG. 1 shows the longitudinal section of an according to of the invention trained direct current pressure regulator as part of a schematically indicated pneumatic or hydraulic control system, Fig. 2 a pressure regulator according to FIG. 1, but in a structurally simplified design, FIG. 3 shows the axial longitudinal section a twin pressure regulator suitable for bridge arrangements, which according to the structure and operation corresponds to the previously described embodiments.

The direct current pressure regulator described according to FIGS. 1 and 2 consists from a cylindrical magnet housing that encloses the central armature space Contains excitation winding. The upper and lower yoke plates are through an outer Casing pipe mechanically and magnetically connected and limit the pressure-tight design Armature space in which the armature is guided by the one surrounded by the winding metallic pole tube can move axially.

According to the invention, the armature displaceable in the pole tube is in shape a ball 1 is formed, which can roll on the inner wall of the pole tube.

The inner diameter of the pole tube is only small for this purpose, z. B. a few l / roo mm larger than the diameter of the anchor ball, the ball always rests on one side of the inner wall of the pole tube.