DE2826973A1 - MAGNETIC VALVE - Google Patents

Abstract

A solenoid valve arrangement, in particular for normally open (NO) and normally closed (NC) operation, has three ports (A, R, P), which are grouped together on one end face of the housing. There are two coaxial valve seats (8, 11) situated opposite one another at a distance from one another, between which an armature (3) is arranged in such a way as to be axially displaceable counter to a spring force by magnetic forces, within a cylindrical space surrounded by a coil former. The end faces of the armature (3) form, together with the associated valve seats (8, 11), two valves (4, 8, 11, 12) which can be operated alternately, one valve seat (8) being assigned within the coil space, an insert (6) fixed to the housing. The third port (P) is connected to a free passage through the magnet coil. The passage is here sealed off from the second port (R) in both positions of the armature and, in one position of the latter, it is connected to the first port (A) via the open valve seat (8). <IMAGE>

Description

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magnetic valve

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

There are known solenoid valves in a wide variety of designs, which have three connections, one connection of which can also only be designed as a ventilation opening. It is about Solenoid valves for normally open and normally closed punctures, then three connections are required, two of which are interchanged when changing punctures.

The known solenoid valves have the disadvantage that the two Connections and the vent or the three connections are not all arranged on one side. Solenoid valves that would have all connections or openings on the same connection side, would offer the essential advantage that they are on can be arranged on a base plate to which all supply and discharge lines can be led and that when switching from normally open puncture mode (NO) to normally closed mode of operation (NC) only two connections per solenoid valve on the same base plate need to be interchanged.

The object of the invention is therefore to provide a solenoid valve, in particular for normally open and normally closed puncture the initially specified type, in which all connections or openings are arranged on the same side.

According to the invention, the object is achieved with the features in the identifier of claim 1 solved.

Advantageous embodiments according to the invention result from the features of the subclaims.

The invention is based on two embodiments more in individually described. In accompanying drawings shows

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Pig. 1 shows an axial section through a first exemplary embodiment,

Fig. 2 two circuit symbols for the normally open and the normally closed function of the embodiment according to FIGS. 1 and

3 shows an axial section through a second exemplary embodiment.

1 shows a solenoid valve according to the invention with a housing 1 a bobbin 2 arranged in the dsm housing and one as Valve tube armature 3 is shown, one end 4 of which passes through a central bore 5 in an insert part 6 Is guided pressure-tight displaceable.

In the cover part 7 of the housing there is a rubber-elastic first valve seat 8 designed as a disk, the the one end 4 of the armature 3 is opposite and which, together with the armature end 4, forms a first, cover-side valve 4, 8. In the cover part 7, the insert part 6 is held centrally. A spring 9 is located between the armature 3 and the insert part 6 arranged, which loads the armature 3 in the opening direction of the valve 4, 8.

In the bottom part 10 of the housing there are three connections P, A and R as well as a second valve seat designed as an annular body 11, which with the other end 12 of the valve-tube-like armature 3 is a second, bottom-side valve 11, 12 forms.

A first tubular body 13 is attached to the insert part 6, in which the armature 3 is displaceably guided and its free The end engages in a groove 14. In the housing 1, a second tubular body 15 is arranged, the diameter of which is slightly larger than

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is the diameter of the first tubular body 13. Both tubular bodies 13 and 15 are within the coil cavity arranged concentrically to one another and the second, outer tubular body 15 seals the coil 2 via seals 16 and 17 compared to the free gap 18 between the first and second tubular body 13 and 15 or between the insert body 6 and the second tubular body.

The connection P closes via an outer annular recess on the bottom 19 in the housing 1 to the gap 18. The outer ring recess 19 is formed by a valve chamber 20 on the bottom separated by the free end of the tubular body 13 in connection with a sealing ring 21 pressure-tight. The bottom-side Valve chamber 20 connects to connection R. When the bottom valve 11, 12 is closed, the valve chamber 20 is separate from the tubular interior of the armature 3 or from the central connection A separated.

Via an axial groove 22 on the outer circumference of the armature 3 is the The bottom valve chamber 20 is connected to the spring chamber 23 between the insert 6 and the armature 3, so that the pressures are always balanced in rooms 20 and 23.

The gap 18 in the cover part 7 is connected to a cover-side valve chamber 25 via an opening 24 in the insert part 6, in which the cover valve 4, 8 is located. By means of a sealing ring between the anchor end 4 and the insert part 6, the cover-side The valve chamber 25 is separated from the spring chamber 23 or from the valve chamber 20 on the bottom in a pressure-tight manner. According to Fig. 2 this is Solenoid valve suitable for a normally open function (NO) and a normally closed function (NC).

Like the upper circuit symbol in Fig. 2 next to the circuit identifier NO indicates the normally open function, the connection P is connected to the supply.

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In the in Pig. 1, in which it is not electrically excited and the armature 3 is held in its rest position under the force of the spring 9, in which the base valve 11, 12 is closed and the cover valve 4, 8 is open, is the supply Via the connection P _5, the annular space 19, the gap 18, the opening 24, the cover-side valve space 25, the open valve 4, 8 and the tubular interior of the armature 3 are connected to the connection A (consumer connection) ^ At the same time, the connection A is in the normal position of the solenoid valve is separated from port R.

If the NO-switched solenoid valve is electrically energized, then the 'armature 3 in the closing direction of the cover valve 4, 8 and in the opening direction of the bottom valve 11, 12 against the Force of the spring 9 shifted. Here, the cover valve 4, 8 is closed and the bottom valve 11, 12 open, so that with it the supply at connection P is disconnected from connection A and connection A via the open valve 11, 12 is connected at the same time the connection R is connected, which here serves as a vent.

If the solenoid valve according to the lower circuit symbol in Fig. 2 is used next to the circuit identifier NC for normally closed function, then the supply is connected to connection R, which, as described above, is connected to connection A (in the normal position of the solenoid valve shown in Fig. 1) ( Consumer connection) is blocked. On the other hand, port A is connected to port P via the open cover valve k, 8, which takes on the ventilation function here.

If the NC-switched solenoid valve is electrically excited, then the supply present at R is connected to A via the open bottom valve 11, 12, while A is connected to P via the closed one Lid valve is shut off.

In FIG. 3, those parts which are essentially the same or functionally identical to parts of FIG. 1 are the same Provided with reference numerals.

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The solenoid valve shown in Fig. 3 differs from the solenoid valve according to Fig. 1 essentially in that the armature 3 is not designed as a continuous valve tube. The known armature 3 in Fig. 2 consists of a pipe section, in the lower end of which a rubber-elastic body 30 is tightly pressed. Inside the armature, a spring 31 is supported on the body 30, which loads a further rubber-elastic body 32, which is arranged in the upper end of the pipe section so as to be displaceable against the force of the spring 31 and is pressed by the spring into an upper end position. The outer end face of the body 32 works together as a sealing face 33 with a central valve seat 34 in the insert part 6. The valve 33 ₃ 34 thus formed corresponds to the cover-side valve 4j 8 in Fig.l.

The valve seat 34 is in the insert part β via a transverse channel 24 connected to a gap Ib. This gap 18 is of a Pipe body 13 on the insert part 6 and from a further pipe body 15 formed with a slightly larger diameter. The gap 18 is pressure-tightly connected to the connection P, so that when open Valve 33, 34, the port P is connected to the port A. When the valve 33, 34 is closed, port P is from port A. locked.

A spring 9 is between a housing projection and a shoulder clamped at the lower end of the armature 3. The spring 9 loads the armature 3 in the opening direction of the valve 33, 34.

The lower end face 35 of the rubber body 30 works together as a sealing surface with a valve seat 36 on the bottom. The valve 35, 3b thus formed corresponds to the bottom valve 11, 12 in FIG. 1. The valve seat 36 is connected to the connection R, so that when the valve 35, J> 6 is open and the valve 33, 34 is closed, A is connected to R. . In the normal position of the solenoid valve according to FIG. 2, the armature 3 is pressed by the force of the spring 9 against the valve seat 36, so that the valve 35, 36 is closed and the valve 33, 34 is open. If the supply is connected to P and the consumer to Λ, the solenoid valve is used for normally open function (NO), i.e. the supply is connected to A via P as long as that

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Solenoid valve is not energized and consequently the valve 35, 36 closed and the valve 33, 3 ^ is open. When aroused the valve 35, 36 open and the valve 33, 34 closed, so that A is vented to R, while P is shut off from A (Fig. 2 upper symbol).

Should the solenoid valve be in normally closed puncture (NC) are used, then the supply is applied to terminal R. The supply from the right is then in the normal position Port A blocked, which is via the open valve 33, 3 ^ to P is vented. When the solenoid valve is excited, the supply from R is connected to A via the open valve 35, 36, while P is shut off from A by the closed valve 33, 3 ^ is.

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Claims (6)

Munich, June 16, 197 TPi-pd -1510- K.NÜRR - BREMSE G.m.b.H. Moosacher Strasse BO BODO Munich 40 Expectations : Solenoid valve in particular for normally open (NO) and normally closed (NC) function with three connections, two of which are on one face of the valve and with two coaxially opposed valve seats, between which an armature is located within a cylindrical space surrounded by a coil body is arranged axially displaceable by magnetic forces against a spring force and the end faces of the armature with the associated valve seats form two valves that can be operated alternately, one valve seat being assigned an insert part fixed to the housing within the coil space, characterized in that the third connection (P) is connected to the same End face like the first and second connection (A and R) and connects to a free passage outside the solenoid, which is sealed in both valve positions of the armature from the second connection (R) and in one valve position via the open valve seat with the ers th terminal (A) is connected. 2. Solenoid valve according to claim 1, characterized in that the Passage is formed at least partially by an axially inner gap between the bobbin and the armature. 3. Solenoid valve according to claim 1, characterized in that the Passage at least partially from an axially outer gap between the bobbin and the one surrounding the bobbin Housing shell is formed, Q fj qD ρ ο / η λ *% β ORIGINAL INSPECTED eweo.oa / uuz * _ ₀ _ 4. Solenoid valve according to claim I _3, characterized in that the passage is at least partially formed by at least one housing bore located outside the coil body within the housing jacket surrounding the coil body. 5 · Solenoid valve according to one of Claims 2, 3 or 4 , characterized in that the passage adjoins a transverse channel in the insert part with the space for the one valve seat. 6. Solenoid valve according to one of claims 1 to 5 with two opposite valve seats and a valve tube-like design Anchor, one end of which is guided in a pressure-tight manner through a central hole in the insert and with a valve seat forms a first valve that is in the connecting path between the first and the third connection and the other end of which with the other valve seat is a second Forms valve which lies in the connection path between the first and the second connection, characterized in that When the second valve is closed, the first connection (A) via the second valve seat designed as an annular disk, the armature and the open second valve is connected to the third connection (.P) and that when the first valve is closed the the first connection (A) is connected to the second connection (R) via the second valve seat and the open second valve. description 909883/0023 ~ ³ ~