EP2157587A2 - Pole tube and actuating magnet with same - Google Patents

Abstract

The tube (1) has an armature (12) accommodated in an anchor area (10) in an axially displaceable manner. The anchor area is closed at a side by a closing insert (14) that acts indirectly or directly as a stroke limitation. The closing insert is attached to a seal for sealing the anchor area, where the seal is designed as an elastic sealing lip (21) and formed as a single-piece at the closing insert. The sealing lip is designed in the area of a front side circumference edge of the closing insert, where the closing insert is made fiber-reinforced plastic.

Description

The invention relates to a pole tube according to the preamble of claim 1 and a solenoid operated therewith.

Such pole tubes are for example from the DE 199 52 800 or the DE 10 2006 021 927 A1 known. Accordingly, a pole tube has an armature space surrounding sleeve in which a magnet armature is received axially displaceable. At one end portion of the armature space, a pole piece is arranged, which is usually penetrated by a plunger, so that an axial displacement of the armature is transmitted via the plunger to the valve to be actuated.

The other end portion of the armature space is pressure-tightly sealed by means of a closure insert acting as a stroke limiter. In this an emergency operating plunger is provided, via which the magnet armature can be actuated by a fault, for example a power failure by hand. In many applications, the armature space is filled with pressure medium, so that appropriate precautions must be taken between the sleeve and the closure insert to complete the armature space pressure-tight. In the known solutions, O-ring seals are provided between the inner circumferential wall of the sleeve and the outer peripheral wall of the lock insert and between the outer periphery of the emergency operating slide and an inner circumferential wall of a slide guide in the lock insert.

The disadvantage of such a solution is that a comparatively high manufacturing complexity is required to form the recordings for said O-rings. Furthermore, the assembly is difficult because the O-rings must be used properly without damage. Another disadvantage is that the closure insert is elaborately made of metal, such as brass, machined.

Against this background, the invention has for its object to provide a pole tube and an actuating magnet executed therewith, in which the sealing of an armature space is made possible with comparatively simple means.

This object is achieved with respect to the pole tube by the feature combination of claim 1 and with respect to the actuating magnet by the feature combination of the independent claim 16.

According to the invention, the pole tube is closed at one end section by means of a closure insert, which acts as a stroke limiter. At the closure insert elastic sealing lips are formed, which deform elastically when inserting the closure insert and create a sealing against the inner peripheral wall of an armature space of the pole tube. Such a solution is extremely easy to assemble, since the sealing lip does not have to be used separately. Another advantage is that it is extremely easy for the manufacturer to design the sealing lip geometry for optimum sealing.

In a preferred solution, the closure insert is made of plastic, preferably of fiber-reinforced plastic, for example by injection molding.

The structure of the closure insert is particularly simple when the sealing lip is formed circumferentially in the region of an end-side peripheral edge of the closure insert.

In this case, the sealing lip can be limited on the one hand by a Stirnflächenringnut. This preferably tapers away from the said handling edge.

The contour of the sealing lip can be further optimized if this is circumferentially downgraded and gradually expanded radially to the peripheral edge.

This radial extension is preferably made conical. The sealing lip is at a distance to the grading in abutment against a Polrohrinnenumfangswandung.

In one embodiment, a constriction is provided approximately centrally on the outer circumference of the closure insert, in which a Polrohrendabschnitt engages by forming to fix the closure insert material fit.

The actuating tappet passing through the closure insert is likewise guided in a sealing manner and preferably rests against a seating surface of the closure insert with a sealing cone.

In this solution, a sealing ring may be provided on a guided in the closure insert guide pin of the emergency actuating ram.

Alternatively, the sealing lip can also be designed as a circumferential radial collar, which cooperates sealingly with the above-described Polrohrendabschnitt formed by forming. It is preferable to provide both a radial collar and a frontal sealing lip in the above-described configuration on the closure insert.

The radial collar is preferably beyond the sealing lip in the radial direction.

In this variant, it is advantageous if the radial collar is arranged in the constriction of the closure insert described above.

In principle, it is possible to manufacture the sealing lips of a softer material than the base body, so that these areas are optimized in terms of the sealing function.

Other advantageous developments of the invention are the subject of further subclaims.

• Figur 1 einen Längsschnitt durch ein Polrohr eines Betätigungsmagneten;
• Figur 2 einen Verschlusseinsatz für ein Polrohr gemäß Figur 1;
• Figur 3 ein Detail Y aus Figur 2;
• Figur 4 eine Seitenansicht eines zweiten Ausführungsbeispiels eins Verschlussstückes;
• Figur 5 ein Detail X des Verschlussstückes gemäß Figur 4 und
• Figur 6 eine dreidimensionale Darstellung des Verschlusseinsatzes gemäß Figur 4.

In the following, a preferred embodiment of the invention is explained in more detail with reference to schematic drawings. Show it:

• FIG. 1 a longitudinal section through a pole tube of an actuating magnet;
• FIG. 2 a closure insert for a pole tube according to FIG. 1 ;
• FIG. 3 a detail Y out FIG. 2 ;
• FIG. 4 a side view of a second embodiment of a closure piece;
• FIG. 5 a detail X of the closure piece according to FIG. 4 and
• FIG. 6 a three-dimensional view of the closure insert according to FIG. 4 ,

This in FIG. 1 shown in longitudinal section pole tube 1 has a basic structure, as for example, from the aforementioned DE 10 2006 021 924 is known. Such a pole tube 1 has a pole sleeve 2 made of magnetizable steel, which is connected via a separator ring 4 made of non-magnetizable material with a pole piece 6 by welding. In this a displaceable in the axial direction ram 8 is guided over the example, a valve spool of a valve to be actuated can be adjusted. This Polrohrmantel consisting of the sleeve 2, the separator ring 4 and the pole piece 6 defines an armature space 10 in which a magnet armature 12 is slidably guided. This in FIG. 1 illustrated pole tube 1 is encompassed in an actuating magnet of a solenoid, not shown, in the energization of the armature in the illustration according to FIG. 1 is adjusted to the left. In order to prevent the plunger-side end face of the magnet armature 12 from adhering to the annular end face of the pole piece 6 penetrated by the plunger 8, an antistick disc 15 is accommodated thereon. The in FIG. 1 right end portion of the armature space 10 is closed by a closure insert 14 which is connected by rollers or other forming process with the sleeve 2, wherein a bead 16 of the sleeve 2 is rolled into a constriction 18 of the closure insert 14. The illustrated pole tube 1 with the attached magnetic coil is screwed via a fastening thread 20 into the housing of the valve to be actuated.

To seal the armature space 10 is - as will be explained in detail below - the closure insert 14, a circumferential sealing lip 21 is formed which sealingly abuts the inner peripheral wall of the pole tube 1 delimiting the armature space 10, so that the armature space 10 filled with pressure medium seals towards the outside is.

The armature stroke in the direction of the closure insert 14 is limited by an emergency operating plunger 24, which is displaceable in the closure insert 14 is guided and rests in the illustrated basic position with a cone 26 on a seat 28 of the closure insert 14.

Details of this closure insert 14 are described below with reference to FIGS. 2 and 3 explained. In the illustration according to FIG. 2 the end portion of the sleeve 2 of the pole tube 1 is not yet form-fit by rolling into the constriction 18 formed into it - ie FIG. 2 shows the relative position of the sleeve 2 and the closure insert 14 before rolling.

According to FIG. 2 the circumferential sealing lip 21 is formed by a Stirnflächenringnut 30 which tapers from the left end face 32 obliquely inwardly with the radially outer flanks, wherein the peripheral apex 34 of the Stirnflächenringnut 30 is rounded. In this way, an inner edge 36 of the sealing lip 21 is made obliquely, so that the sealing lip 21 for in FIG. 2 left circumferential edge 38 of the closure insert 14 tapers.

The profile of the sealing lip outer circumferential surface is in detail Y in FIG. 3 shown. Clearly visible in this illustration is the peripheral edge 38, which is slightly rounded in the illustrated exemplary embodiment and along which the sealing lip 21 bears against the inner peripheral surface 22 of the pole tube. From this peripheral edge 38 away, to the right (view after FIG. 3 ), the outer periphery of the sealing lip 21 is conically tapered, wherein the cone angle a is less than 10 °, preferably less than 5 °. After a predetermined axial distance to the peripheral edge 38, the sealing lip 21 terminates at a radial shoulder 40, via which the closure insert 14 springs back on its outer circumference 42, which corresponds to the outer diameter of the armature space 10 and is thus slidably guided along this. According to the detail in FIG. 3 is in the non-installed state, the diameter D of the peripheral edge 38 is slightly larger than the diameter of the armature space 10 carried out so that in the installed state, the sealing lip 21 is biased radially inwardly, said bias corresponds to the dimension V, the in FIG. 3 is drawn. The abutment of the peripheral edge 38 of the sealing lip 21 against the inner circumferential surface 22 allows a high sealing surface pressure.

By the Stirnflächenringnut 30 in the closure insert 14 in FIG. 2 the edges 36 are pressurized by the pressure medium in the armature space 10 (the pressure in FIG. 2 exemplified by arrows), whereby the sealing lip 21 is pressed in addition to the bias to the inner peripheral surface 22. Even a gap in the pressureless state between the sealing lip 21 and the Inner peripheral surface 22 is closable in operation by the pressure acting on the flanks 36 pressure.

As already mentioned above, the constriction 18 can be seen approximately centrally on the outer circumference of the closure insert 14 into which, after rolling, the flanged edge 16 (in FIG FIG. 2 undeformed) immersed, so that the closure insert 14 is fixed in position.

At the protruding from the sleeve 2 end portion of the closure insert 14, an external thread 44 is formed.

According to FIG. 2 the closure insert 14 has a guide bore in which the emergency actuating push rod 24 is displaceably guided. This has a central guide collar 48 which is slidably guided in the guide bore 46. Between the cone 26 remote and accessible from the outside end portion and the guide collar 48 of the Notbetätigungsstößels 24 a receiving groove 50 is formed for an O-ring, via which the armature space 10 is sealed in the guide for the Notbetätigungsstößel 24. Following left to the guide collar 48 (view after FIG. 2 ) is the Notbetätigungsstößel 24 slightly downgraded and then goes into the cone 26 which rests in the home position on the formed in the armature-side mouth region of the guide bore 46 seat 28. Following the cone 26 to the left ( FIG. 2 ) is then still a stop collar 52 is provided, on the end face 54 to the Hubbegrenzung the adjacent end face of the armature 12 runs. In the event of a malfunction, for example a power failure, the emergency operating tappet 24 can be moved from the outside to the left (see FIG FIG. 2 ) to adjust the armature 12 and thus also the plunger 8 and bring the valve by hand in a corresponding position.

In the illustrated embodiment, the closure insert 14 is made of plastic, wherein the choice of material is optimized in terms of optimum sealing. In principle, it is also possible to carry out the sealing lip 21 of a different material than the rest of the body of the closure insert. The sealing lip 21 could for example consist of a material component with a higher elasticity. As a manufacturing process, the injection molding offers, in which case in the two-component injection molding a sealing lip made of a relatively soft material can be made in one piece on the closure insert 14, which otherwise consists of a harder material. By a suitable selection of the geometry of the sealing lip 21, this can with a be carried out sufficient elasticity, so that the peripheral edge 38 always bears sealingly against the inner peripheral surface 22 of the pole tube.

For mounting the closure insert is used with the preassembled Notbetätigungsstößel 24 in the end portion of the sleeve 2 until the reshaping end portion 16 is disposed approximately in the region of the constriction 18. After an adjustment of the armature stroke then this relative position between the closure insert 14 and sleeve 2 is fixed by rollers.

Based on FIGS. 4, 5 and 6 a further embodiment of the above-described closure insert 14 is explained. This has in principle the same basic structure as the previously described closure insert 14, ie the peripheral surface of the sealing lip 21 tapers conically from the peripheral edge 38 in the direction of the constriction 18. The elasticity of the sealing lip 21 is inter alia by the geometry of the Stirnflächenringnut 30 (see FIG. 6 ) certainly. In the transition region between the sealing lip 21 and the constriction 18 is a cylindrical portion with the outer peripheral surface 42, the flat against the inner peripheral surface of the sleeve 2, while the sealing lip 21 is biased due to their slightly larger diameter with bias sealingly against the inner peripheral surface 22.

At the in FIG. 4 illustrated embodiment, the constriction 18 is designed with a slightly larger axial length than in the embodiment described above. Approximately centrally in the constriction 18, a radial collar 56 is provided, which has two radially extending annular end faces 58, 60 and the axial length (width) is substantially less than the axial length of the constriction 18 is executed. The outer diameter R of the radial collar is designed substantially larger than the outer diameter of the outer peripheral surface 42 of the insert 14, so that this radial collar 56 is in the radial direction beyond the other wall regions of the closure insert 14 addition.

In FIG. 5 the profile in the area of this radial collar 56 is shown enlarged. Accordingly, the radial collar 56 divides the constriction 18 into a flanging groove 62 and a rear groove 64, to which in the illustration according to FIG FIG. 4 to the left of the externally threaded 44 formed outside the sleeve 2 arranged end portion of the closure insert 14 connects. The transition takes place via an inclined surface 66, the geometry of which can in principle be arbitrarily designed. The from the bottom of the flare 62 towards Outside circumferential surface 42 extending groove flank 68 is provided in the transition region to the outer peripheral surface 42 with a transition radius 70, which is optimized with respect to the forming process, so that when rolling the flanged edge 16 a flat, substantially sealing contact between the closure insert 14 and sleeve 2 is achieved. After crimping then lies the rolled end face portion of the sleeve 2 in addition sealingly against the annular end face 60 of the radial collar 56. The choice of material of the radial collar can also be selected again with regard to the optimized sealing effect. In the case in which the main body of the closure insert 14 is to be made of a comparatively stiff material, both the sealing lip 21 and the radial collar 56 could be made of a relatively elastic material with good sealing effect in the two-component injection molding.

In principle, it is also possible to effect the sealing between the sleeve 2 and the closure insert 14 solely by the radial collar 56.

When inserting the closure insert 14 into the sleeve 2 of this radial collar 56 still acts as a stop, since it runs with the end face 60 on the annular end face of the undeformed sleeve 2.

Of course, the closure insert 14 can also be made of other materials or by other methods - it is essential that the sealing lip 21 is designed by suitable geometry and / or choice of material so that it can fulfill their sealing function.

Disclosed are a pole tube for an electromagnet and a running with such a pole tube actuating magnet, wherein on a closure insert of the pole tube integrally sealing lips are provided for sealing an armature space.

LIST OF REFERENCE NUMBERS

1

pole tube

2

pole sleeve

4

separating ring

6

pole piece

8th

tappet

10

armature space

12

armature

14

lock insert

15

Anti adhesive disk

16

beaded

18

constriction

20

mounting thread

21

sealing lip

22

Inner circumferential surface

24

Notbetätigungsstößel

26

cone

28

Seat

30

Stirnflächenringnut

32

face

34

vertex

36

flank

38

peripheral edge

40

radial shoulder

42

Outer circumferential surface

44

external thread

46

guide bore

48

guide collar

50

receiving groove

52

stop collar

54

face

56

radial collar

58

Annular face

60

Annular face

62

Bördelnut

64

groove

66

sloping surface

68

flank

70

Transition radius

Claims (16)

Pole tube for an actuating magnet, wherein a magnet armature (12) in an armature space (10) is received axially displaceable, which is closed on one side via a indirectly or directly acting as a stroke limiting closure insert (14) to which a seal for sealing the armature space (10 ) is zugeorndet, characterized in that the seal as an elastic sealing lip (21, 56) is integrally formed on the closure insert (14). Polrohr according to claim 1, wherein the closure insert made of plastic, preferably made of fiber-reinforced plastic, in particular an injection molded part, in particular a multi-component injection molded part Polrohrrohr according to claim 1 or 2, wherein the sealing lip (21) circumferentially in the region of an end-side peripheral edge (38) of the closure insert (14) is formed. Polrohr according to claim 3, wherein the sealing lip (21) on the one hand by a Stirnflächenringnut (30) is limited. A pole tube according to claim 4, wherein the end surface annular groove (30) narrows away from the peripheral edge (38). Pole tube according to one of the claims 3 to 5, wherein the sealing lip (21) is circumferentially downgraded and gradually widens towards the peripheral edge (38). Pole tube according to claim 6, wherein this flared portion is conical. A pole tube according to claim 6 or 7, wherein the closure insert (14) abuts the pole tube inner circumferential wall with an outer peripheral edge (42) formed by the downgrading. Pole tube according to one of the preceding claims, wherein on the outer circumference of the closure insert (14) has a constriction (18) is provided, in which a Polrohrendabschnitt (16) is rolled. Pole tube according to one of the preceding claims, wherein in the closure insert (14) an emergency actuating ram (24) is guided. A pole tube according to claim 10, wherein the emergency actuating ram (24) rests with a cone (26) on a seat (28) of the closure insert (14). Polrohrrohr according to claim 10 or 11, with sealing means, in particular with a sealing ring in the receiving groove (50) on a guided in the closure insert (14) guide collar (48) of the Notbetätigungsstößels (24). Pole tube according to one of the preceding claims, wherein a circumferential radial collar (56) on the closure insert (14) is provided on the side of the sealing lip (21). A pole tube according to claim 13, wherein the radial collar (56) projects beyond the sealing lip (21) in the radial direction. Pole tube according to claim 13 or 14 and 9, wherein the radial collar (56) in a constriction (62, 64) of the closure insert (4) is arranged. Actuating magnet with a pole tube (1) according to one of the claims 1 to 15.

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