DE2909768A1 - Magnetic valve with armature acting as relief piston - requires low magnetic closure force and uses pressure medium to maintain armature equilibrium - Google Patents

Abstract

The valve has a closure element moved into the valve closed position via a magnetic force against the flow pressure with the latter acting on a relief piston. This is provided by a magnetic armature which freely slides relative to the closure element and which is spring biased into contact with a counter-bearing fixed to the valve housing on the side opposite the closure element. The closure element incorporates an annular space which in the open position of the latter communicates with the flow via bores and/or channels in the closure element and the magnetic armature which open into the space between the latter and the counter-bearing.

Description

Rausch & Pausen, 8672 Since / Bavaria

magnetic valve

The invention relates to a solenoid valve with a through

Magnetic force against the inlet pressure in the closed position

displaceable closure piece and one acted upon by the inlet pressure Relief piston.

It is already known for solenoid valves for safe closure member actuation by means of small magnetic forces, the Assign the magnet armature to a relief piston. The gain in power achieved in this way, however, has the disadvantage of enlarging it of the valve housing and a complicated design of these solenoid valves. It also works with the known Valves the inlet pressure with the locking piece in the closed position on the relief piston.

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The object of the invention is to create a solenoid valve, which enables high pressures to be created easily with small magnetic switching capacities.

According to the invention this is achieved in that the closure piece a magnet armature is assigned freely slidably as a relief piston, the piece with the end facing away from the closure rests against an abutment fixed to the valve housing by spring force and that an arranged in the closure piece, in the open position of the same connected to the inlet annular space or the like. opens out via bores and / or channels in the closure piece and magnet armature between the magnet armature and the abutment. The annular space is expedient by means of a step in the circumferential surface of the closure piece formed. In the case of the solenoid valve, the armature itself acts as a relief piston Excitation of the magnetic coil supported by pressure build-up on the armature with a small magnetic force against the spring force and the opening force exerted on the closure piece by the pressure medium applies the closure piece to the valve seat, wherein the magnet armature in the closed position of the locking piece is advantageously free of unloading forces.

In a preferred embodiment of the solenoid valve, the magnet armature is cup-shaped and has an annular shape End to a valve housing serving as an abutment

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Ring can be put on, while the interior of the same has a Hole in the bottom of the magnet armature as well as transverse and longitudinal holes is connectable in the closure piece with the annular space.

In a further embodiment of the solenoid valve, the closure piece be arranged freely displaceably in a core body having the valve seat, which connects the annular space with the Has drain connecting passages and transverse bores and together with the magnet armature in one on the closure piece remote end, e.g. by means of a magnetic body, is housed in a tightly sealed guide sleeve. In the end there are still measures for the safe removal of what passes through the annular gap between the armature and the abutment Part of the print medium is provided in that in the peripheral surface of the magnet armature drainage channels are formed which are permanently connected to the drain via the passages in the core body stand.

How the invention can be carried out shows with the for these essential features, the embodiment shown in the drawing. Show it:

Fig. 1 shows a solenoid valve in the rest position in section,

Fig. 2 is a partial section of a solenoid valve in the open position and

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Pig. 3 shows a partial section of a solenoid valve in the closed position.

In the figures, 1 denotes the valve housing, which has an inlet 2 and an outlet 3. A guide sleeve 4 is tightly and firmly connected to the valve housing 1, which the valve magnet 5 with its connecting pins 6 and a magnetic clip 7 carries. At its free end is the guide sleeve 4 is tightly closed by a magnet body 8. A valve housing fixed dips into the guide sleeve 4 Core body 9, in which a valve seat 10 is arranged and a locking piece 11 is housed freely displaceable. The closure piece 11 is to form an annular space 12 provided with a step 13, in the transverse bores 14 and transverse bores 15 provided in the closure piece 11 of the core body 9 open out. The transverse bores 15 are in particular groove-shaped passages 16 in the circumferential surface of the core body 9 in connection. The guide sleeve 4 also clears a cup-shaped magnet armature 17 displaceably, by a helical spring 18 clamped between the core body and the magnet armature 17 its annular end 17 ″ to a valve housing fixed Ring 19 is applied. In the bottom 17 * of the armature 17 is a bore 23 is provided which connects the interior 20 of the same with a longitudinal bore 21 in the closure piece

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Bring allows that connected to the transverse bores 14 is.

In Pig. 1, the closure piece 11 lies on the valve seat and separates the inlet 2 from the outlet 3 · At the same time, the coil spring 18 attaches the magnet armature 17 to the ring 19 created and held.

Under the action of the inlet pressure of the pressure medium on the closure piece 11 and through pressure build-up in the annular space 12 when the valve magnet 5 is not excited> the closing piece 1 "1 from Valve seat 10 moved upwards, whereby pressure medium via the transverse bores 14 and 15, the passages 16 to the drain flows. At the same time, pressure medium passes through the longitudinal bore 21 and the bore 23 into the interior 20 of the magnet armature above. In this case, a pressure build-up in the interior space 20 takes place which is greater than the pressure in the gap space 24. By venting of the armature 17 from the ring 19 occurs from the pressure medium Inner space 20 via the annular gap between the end 17 ″ and the ring 19 into groove-shaped drainage openings 22 in the circumferential surface of the magnet armature 17, which subsequently reaches the outlet 3 via the passages 16.

total forces acting on the armature 17 result in a resultant that the in the area of the annular space 12 on the

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29Q9768

Closing piece 11 acting opening force rushes counter to it is. Appropriate coordination of the transverse bores 14 and the longitudinal bore 21 is an optimal compensation of the Forces for maintaining the open position of the locking piece 11 (Fig. 2) achievable.

By energizing the valve magnet 5, the magnet armature is activated 17 exerted a magnetic force and the locking piece .11 for Separation of inlet 2 and outlet 3 applied to the valve seat 10. Until the pressure medium drains from the interior 20 remains the force balance on the armature 17 is maintained (Fig. 3)

Since it is for the application of the closure piece 11 to the valve seat and maintaining the closed position requires only small magnetic forces, is sufficient for the safe functioning of the solenoid valve a valve magnet 5 with low switching capacity.

It corresponds to the essence of the invention that the sealing surfaces the closure piece and valve seat can equally be designed as a cone, ball or flat seal.

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Claims (6)

Rausch & Pausen, 8672 Selb / Bavaria Claims Solenoid valve with a closure piece that can be displaced into the closed position by magnetic force against the inlet pressure and a relief piston acted upon by the inlet pressure, characterized in that the closure piece (11) is assigned a freely displaceable magnet armature (17) as a relief piston, the end facing away from the closure piece (11) (17 ¹¹ ) rests against a valve housing-fixed abutment (ig) by spring force and that an annular space (12) or the like arranged in the closure piece (11) and in its open position connected to the inlet (2). opens out via bores and / or channels in the closure piece (11) and magnet armature (17) between the magnet armature and the abutment (19). 2. Solenoid valve according to claim 1, characterized in that that the annular space (12) is formed by a deposition (13) in the order circumferential surface of the closure piece (11). - ■■■ - ■ '"■■ -.- - / 2 0 30 038/0372 3 · Magnetic valve according to one or both of the preceding claims, characterized in that the magnet armature (17) formed topfförinig and can be placed with its annular end (17 ¹¹⁾ on a region serving as an abutment valve fixed to the housing ring and that the interior (20) via a bore (23) in the bottom (17 ¹ ) of the magnet armature (17) and transverse (14) and longitudinal bores (21) in the closure piece (11) can be connected to the annular space (12). 4. Solenoid valve according to one or more of the preceding claims, characterized in that the closure piece (11) in a core body (9) having the valve seat (10) is arranged displaceably, the transverse bores (15) and passages permanently connecting the annular space (12) to the outlet (3) (16) and that the core body (9) and the magnet armature (17) in a remote from the closure piece (11) End by a magnet body (8) tightly closed guide sleeve (4) are housed. 5. Solenoid valve according to one or more of the preceding claims, characterized in that the magnet armature (17) in the ümfangsflache drainage channels (22), which the space Connect the armature (17) and the abutment fixed to the valve housing to the passages (16) in the core body (9). - / 3. 030038/0372 2309768 6. Solenoid valve according to one or more of the preceding claims, characterized in that the sealing surfaces of Closure piece (11) and valve seat (10) as a cone, ball or Flat seals are formed. 030038/0372