WO2009056405A1

WO2009056405A1 - Solenoid valve

Info

Publication number: WO2009056405A1
Application number: PCT/EP2008/062617
Authority: WO
Inventors: Klaus Landesfeind; Nicolas Houis; Carsten Bodmann
Original assignee: Robert Bosch Gmbh
Priority date: 2007-10-29
Filing date: 2008-09-22
Publication date: 2009-05-07
Also published as: DE102007051560A1

Abstract

The invention relates to a solenoid valve having a magnet assembly and a valve cartridge comprising a capsule, a valve insert connected to the capsule, an armature disposed displaceably within the capsule and comprising a plunger having a closure element (27.1) and a main sealing element (27.2), and a valve body (30) having a main valve seat (30.1), wherein the main sealing element (27.2) and the main valve seat (30.1) form a main valve (31) for adjusting a fluid flow, wherein a magnetic force generated by the magnet assembly moves the armature axially against the force of a return spring, and the main sealing element (27.2) sealingly enters the main valve seat (30.1). According to the invention, the main valve (31) has elastic sealing means (27.3) having a known elasticity, wherein a small fluid flow can be adjusted as a leakage by deliberately deforming the elastic sealing means (27.3) when the main valve (31) is closed.

Description

description

Title solenoid valve

State of the art

The invention relates to a solenoid valve according to the preamble of independent claim 1.

A conventional solenoid valve, in particular for a fluid aggregate, which is used for example in an anti-lock braking system (ABS) or a traction control system (ASR system) or an electronic stability program system (ESP system), is shown in FIG. As is apparent from Figure 1, the conventional solenoid valve 1, which is designed for example as a normally open control valve, a magnetic assembly 2 for generating a magnetic flux comprising a housing shell 2.1, a winding support 2.2, a coil winding 2.3 and a cover 2.4, and a Valve cartridge 5 which comprises a capsule 5.1, a valve insert 9 connected to the capsule via a sealing weld, an armature 6 with a plunger 7, which has a closing element 7.1 with a main sealing element 7.2, and a return spring 8. The wound on the winding support 2.2 coil winding 2.3 of the magnet assembly 2 forms an electrical coil, which is controllable via electrical connections 2.5 and generates a magnetic flux. The valve insert 9 conducts the magnetic flux introduced from the magnet assembly 2 via the cover disk 2.4 axially via an air gap 3 in the direction of the armature 6. By energizing the coil winding 2.3 via the electrical connections 2.5 and the magnetic flux generated thereby, the armature 6 is counter to

Force of the return spring 8 moves against the valve core 9.

In addition, the valve insert 9, which is caulked via a caulking 9.1 with a fluid block, not shown, the so-called valve body 10 which is pressed into the valve core 9 and a main valve seat 10.1 includes, in which the Closing element 7.1 immersed sealingly over a running as Dichtkalotte main sealing element 7.2 to implement the sealing function of the solenoid valve 1. In this case, the main sealing element 7.2 and the main valve seat 10.1 form a main valve 11 in order to set a fluid flow 12.

As further seen in Figure 1, the conventional solenoid valve 1 comprises an eccentrically arranged check valve 4, which performs a directional flow function, and designed as a plastic insert valve member which forms the valve body 16 and for sealing to a surrounding fluid block, not shown, for sealing the Valve body 10 and for receiving a ring filter 13 and a flat filter 14 is used.

The described conventional normally open solenoid valve has the task of very modulating the pressure in a fluid system, with a very low pressure drop gradient, i. a small flow is required. Therefore, hydraulic solenoid valves should be continuously adjustable even with very small strokes of the closing element by the magnet group. A stable operating point is characterized in that there is a balance of forces between opening and closing forces. Furthermore, the system should find its way back to the operating point in the event of faults. In the described conventional electroless open solenoid valve is a continuous adjustability in operating points with very small strokes due to their hydraulic and magnetic characteristics very difficult.

Disclosure of the invention

The erfmdungsgemäße solenoid valve having the features of independent claim 1 has the advantage that a main valve elastic sealing means having a known elasticity, by which a controlled leakage and very low pressure reduction gradients are made possible, so that very small fluid flows can be realized without departing from the hydraulic and magnetic characteristics of the solenoid valve to be dependent. By a targeted deformation of the elastic sealing means and thereby caused changing Anpressverhältnisse and smallest changes in the opening cross-section of the main valve, the fluid flow can be selectively influenced by the closed main valve as a leak. So even the smallest pressure reduction gradients are possible. In addition, the solenoid valve advantageously has a stable len state, since there is always a contact between the main sealing element and the main valve seat in the closed main valve. In conventional normally open solenoid valves, a leakage of the main valve means an uncontrolled pressure loss with a very low gradient by a not completely closing main valve. The leakage of the main valve usually occurs when the closing current through a solenoid of the solenoid valve is not high enough. In the solenoid valve according to the invention, however, can be realized by a controlled leakage of the main valve very low pressure drop and thus small flow rates, without being dependent on the hydraulic and magnetic characteristics of the solenoid valve.

The measures and refinements recited in the dependent claims advantageous improvements of the independent claim 1 solenoid valve are possible.

It is particularly advantageous that the elastic sealing means of the closed main valve can be specifically deformed by the contact pressure or the contact force of the main sealing element in the main valve seat, wherein the contact pressure or the contact force can be adjusted by a corresponding energization of the magnet assembly on the generated magnetic force and finely dosed can be. Thus, the deformation of the elastic sealing elements of the main valve is changed by the variation of the contact pressure or the contact pressure, so that advantageously a small fluid flow can be set as a controlled leakage.

In an embodiment of the solenoid valve according to the invention, the elastic sealing means are arranged for example in the region of the sealing line on the main sealing element of the closing element. Alternatively, the elastic sealing means can be arranged in the region of the sealing line on the main valve seat in the valve body. The elastic sealing means may for example comprise a plurality of segments, which are arranged at a distance from each other.

In an alternative embodiment of the solenoid valve according to the invention, the main sealing element is designed as an elastic sealant and made of an elastic material. When using the main sealing element made of an elastic material, such as, for example, polyetheretherketone (PEEK), its deformability can be exploited to set a controlled leakage. Made of an elastic material - A -

For example, the main sealing element has at least one deliberately introduced imperfection and / or unevenness, which can be compensated for setting the controlled leakage by the set contact pressure or the set contact pressure.

In a further embodiment of the solenoid valve according to the invention, the elasticity of the elastic sealing means can be given in an advantageous manner by a targeted selection of materials.

Advantageous embodiments of the invention described below, as well as those explained above for better understanding thereof, are shown in the drawings. In the drawings, like reference numerals designate components that perform the same or analog functions.

Brief description of the drawings

Fig. 1 shows a schematic sectional view of a conventional solenoid valve.

2 shows a schematic sectional illustration of a main valve of a solenoid valve according to the invention.

Fig. 3 shows a schematic plan view of an embodiment of a main sealing element for the solenoid valve according to the invention.

FIG. 4 shows a characteristic diagram for controlled leakages as a function of FIG

Contact force for the solenoid valve according to the invention.

Embodiments of the invention

As can be seen from Fig. 2, comprises a main valve 31 for an inventive

Solenoid valve, a closing element 27.1 with a main sealing element 27.2 and a main valve seat 30.1, which is arranged in a valve body 30. As is further apparent from FIG. 2, the main valve 31 has elastic sealing means 27.3 with a known elasticity. To set a small fluid flow 12 as a leak when the main valve 31 is closed, the elastic sealing means 27.3 can be specifically deformed. The elastic sealing means 27.3 can be arranged in the region of the sealing line on the main sealing element 27.2 of the closing element 27.1 and / or on the main valve seat 30.1 in the valve body 30.

As can also be seen from FIG. 3, the elastic sealing means 27.3 in the exemplary embodiment shown comprise four segments, which are arranged at a distance from one another on the main sealing element 27.2.

The other components of the inventive solenoid valve can be carried out analogously to the corresponding components of the conventional solenoid valve 1 shown in FIG. 1, so that the solenoid valve according to the invention essentially corresponds to the conventional solenoid valve 1 according to FIG.

In contrast to the conventional solenoid valve 1 according to FIG. 1, the elastic sealing means 27.3 of the main valve 31 of the solenoid valve according to the invention allow a small fluid flow as controlled leakage of the closed main valve 31. The controlled leakage, as can be seen from the characteristic diagram of FIG , very small pressure reduction gradients and thus small fluid flows 12 are realized by the main valve 31, without being dependent on the hydraulic and magnetic characteristics of the solenoid valve. 4 shows two different characteristics Kl,

K2, which represent two different elasticity values and thus two different materials for the elastic sealing means 27.3. Due to the so-changing pressing conditions and the smallest changes in the opening cross section, the fluid flow through the main valve 31 can be influenced in a targeted manner due to the leakage. From a certain contact pressure limit, however, the main valve is completely closed. So even the smallest pressure reduction gradients are possible. The elastic sealing means 27.3 of the closed main valve 31 of the solenoid valve according to the invention are specifically deformable by the contact pressure or contact force of the main sealing element 27.2 in the main valve seat 30.1, wherein the contact pressure or the contact pressure by a corresponding energization of the magnet assembly on the generated magnetic force is adjustable. Since the currentless open solenoid valve according to the invention is continuously adjustable even with very small strokes of the closing element 27.1 by energizing the magnet group, a very metered modulation of the pressure in an associated fluid system is made possible in an advantageous manner. In an alternative embodiment, not shown, of the solenoid valve according to the invention, the main sealing element 27.2 is designed as an elastic sealant and made of an elastic material. When using the main sealing element of an elastic material, such as Polyetheretherketon (PEEK), its deformability can be utilized to adjust a controlled leakage. The main sealing element 27.2 made of an elastic material has, for example, at least one non-circularity and / or unevenness introduced deliberately, which can be compensated for setting the controlled leakage by the set contact pressure or the set contact pressure.

The solenoid valve according to the invention advantageously allows a controlled leakage and very low pressure reduction gradients by the elastic sealing means with the known elasticity, so that very small fluid flows can be realized without being dependent on the hydraulic and magnetic characteristics of the solenoid valve.

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Claims

claims

A solenoid valve comprising a magnet assembly and a valve cartridge comprising a capsule, a valve core connected to the capsule, an armature movably disposed within the capsule, comprising a plunger with a closure member (27.1) and a main seal member (27.2), and a valve body Valve body (30) having a main valve seat (30.1), wherein the main sealing member (27.2) and the main valve seat (30.1) form a main valve (31) to adjust a fluid flow, wherein a magnetic force generated by the magnetic assembly, the armature against the force of a return spring moved axially and the main sealing element (27.2) sealingly immersed in the main valve seat (30.1), characterized in that the main valve (31) comprises elastic sealing means (27.3) with a known elasticity, wherein with the main valve (31) closed by a targeted deformation the elastic sealing means (27.3) a small fluid flow is adjustable as leakage.

2. Solenoid valve according to claim 1, characterized in that the elastic sealing means

(27.3) of the closed main valve (31) are selectively deformable by the contact pressure of the main sealing element (27.2) in the main valve seat (30.1), wherein the contact pressure is adjustable by a corresponding energization of the magnet assembly on the generated magnetic force.

3. Solenoid valve according to claim 1 or 2, characterized in that the elastic

Sealant (27.3) in the region of the sealing line on the main sealing element (27.2) of the closing element (27.1) are arranged.

4. Solenoid valve according to one of claims 1 to 3, characterized in that the elastic sealing means (27.3) in the region of the sealing line on the main valve seat (30.1) in the valve body (30) are arranged.

5. Solenoid valve according to claim 3 or 4, characterized in that the elastic sealing means (27.3) comprise a plurality of segments which are spaced from each other.

6. Solenoid valve according to claim 1 or 2, characterized in that the main sealing element (27.2) is designed as an elastic sealing means and is made of an elastic material.

7. Solenoid valve according to claim 6, characterized in that the main sealing element (27.2) made of an elastic material has at least one purposefully introduced roundness and / or unevenness.

8. Solenoid valve according to one of claims 1 to 7, characterized in that the elasticity of the elastic sealing means (27.3) can be predetermined by a specific choice of material.

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