Magnetic actuator device, magnetic actuator for hydrogen applications and method of manufacture

Abstract

The invention relates to a magnetic actuator device (50, 50 '), in particular a hydrogen-sealed magnetic actuator device, comprising at least one magnetic core (10) and at least one core tube (12) which is at least substantially magnetically separated in the axial direction (14) thereof. According to the invention, in order to achieve hydrogen sealing, the magnetic core (10) is completely closed at least on one side in the axial direction (14), and the core tube is integrally formed with the magnetic core (10).

Description

Technical Field

[0001] The invention relates to a magnetic actuator arrangement according to the preamble of claim 1 , to a magnetic actuator according to claim 17 and to a method according to claims 18 and 19 . Background Art

[0002] From DE 102 35 644 B4 a magnetic actuator device has been proposed which has at least one integral magnetic core and at least one core tube which is at least substantially magnetically separated along its axial direction. Summary of the invention

[0003] The object of the invention is in particular to provide a universal device with advantageous properties in terms of suitability for hydrogen applications. According to the invention, this object is achieved by the features of claims 1, 17, 18 and 19, while advantageous embodiments and improvements of the invention can be derived from the dependent claims.

[0004] The invention relates to a magnetic actuator device, in particular a hydrogen-tight magnetic actuator device, having at least one, in particular one-piece, magnetic core and at least one core tube which is at least substantially magnetically separated along its axial direction.

[0005] It is proposed that in order to achieve hydrogen tightness, especially less than 10 -4 mbar l / s, preferably less than 10 -5 mbar l / s and preferably less than 10 -6 mbar l / s leakage rate, the magnetic core is designed to be completely closed at least on one side in the axial direction, and the core tube is designed integrally with the magnetic core. As a result, good applicability for hydrogen applications can be advantageously achieved, for example in the field of fuel cells and / or electrolysis devices. Advantageously, a high degree of sealing can be achieved, so that in particular hydrogen can be prevented from escaping from the inside of the core tube. Advantageously, leakage can be avoided, in particular also for the smallest known gas molecules, the H2 molecule. Advantageously, sealing points, such as brazing points or welding points, can be completely omitted. Advantageously, the risk of leaks due to gaps and the like can be kept low. In particular, a high degree of sealing can be advantageously achieved, also for the H2 molecule, without significantly affecting the functionality or functional parameters of the magnetic actuator device in this case. In particular, the hydrogen-sealed magnetic actuator device has a resistance of less than 10 -4 mbar l / s, preferably less than 10 -5 mbar l / s and preferably less than 10 -6A leakage rate of mbar l / s is to be understood as a "magnetic actuator device" in particular to be a component of a magnetic actuator that is particularly functionally reliable, in particular a structural component and / or a functional component. A "magnetic actuator" is to be understood as an actuator that is preferably based on the reluctance principle and performs mechanical work by translational movement, such as a solenoid valve or a magnetic switch. In particular, a magnetic actuator in this context is to be understood as a device that is configured to convert electrical power into mechanical power by means of a magnetic field.

[0006] A "core tube" is to be understood in particular as a component of a magnetic actuator, which consists of a magnetic flux-conducting (flux-bunching), in particular (soft) magnetic, preferably ferromagnetic material, which preferably at least largely constitutes the magnetic core of the magnetic actuator and / or which is at least partially, preferably at least largely, arranged inside the coil of a magnetic coil of the magnetic actuator. In particular, the magnetic material is formed as a magnetic material. In particular, the core tube is at least largely formed of magnetic steel. In particular, the core tube forms an inductance together with at least one magnetic coil of the magnetic actuator. In particular, the core tube is at least partially and / or at least on one side in a tubular shape. In particular, the core tube is arranged to at least partially accommodate a magnetic armature of the magnetic actuator. In particular, the core tube is arranged to at least partially constitute a displacement space for the magnetic armature of the magnetic actuator. In particular, the displacement space for the magnetic armature is formed by the tubular part of the core tube. In particular, the longitudinal direction of the core tube extends parallel to the tube axis, in particular the rotational symmetry axis, of the tubular part of the core tube. In particular, the longitudinal direction of the core tube, when installed in the magnetic actuator, extends parallel to the coil axis of the magnetic coil of the magnetic actuator. "Set" is to be understood in particular as being specially programmed, designed and / or equipped. Setting an object to a specific function is to be understood in particular as meaning that the object performs and / or implements the specific function in at least one application state and / or operating state.

[0007] The "magnetic separation" of the core tube should be understood in particular as the separation of two sub-regions of the core tube (composed of the same magnetic material) from each other in such a way that at least a large part of all magnetic field lines extending in the first sub-region of the core tube are prevented from directly transferring into the second sub-region of the core tube. The "magnetic separation" of the core tube should be understood in particular as the interruption of the magnetic flux conductivity of the core tube. In particular, the magnetic separation is arranged to interrupt the magnetic flux passing through the core tube along the axial direction of the core tube. In particular, the magnetic separation is arranged to surround the magnetic field lines of the magnetic field of the magnetic coil in such a way that the magnetic field lines in the area of ​​the magnetic separation are led out of the core tube. In particular, the magnetic separation is arranged in an area of ​​the core tube, which is arranged in the coil interior of the magnetic coil in the installed state of the magnetic actuator. In particular, the magnetic separation is arranged in an area of ​​the core tube, which constitutes a displacement space for the magnetic armature in the installed state of the magnetic actuator. In particular, the axial direction of the core tube extends parallel to the longitudinal direction of the core tube. In particular, the axial direction of the core tube extends parallel to the main extension direction of the core tube. Here, the "main extension direction" of an object is to be understood in particular as a direction which is parallel to the longest side of the smallest geometric cuboid which just completely encloses the object. "Completely closed" is to be understood in particular as having no perforations or through-holes in the axial direction. In particular, the magnetic core has no further elements or components, such as valve tappets, etc., which penetrate the magnetic core on the closed side. In particular, the entire core tube is formed integrally with the magnetic core. In particular, the core tube has no separate separating elements, which are connected to the core tube in a material-fitting manner, for example, and which separate the core tube into two or more parts which are not connected to each other. The term "integrated" is to be understood in particular also as one-piece (molded in one piece or from a single blank, block and / or casting).

[0008] Furthermore, it is proposed that the magnetic separation of the one-piece core tube is achieved at least partially by demagnetizing the material of the core tube wall of the core tube in the separation region of the core tube, which demagnetization is produced in particular by a thermal microstructural transformation of the material of the core tube wall, for example by means of induction or laser annealing. As a result, an effective magnetic separation can be achieved while maintaining a high gas tightness and maintaining a high stability of the core tube. In particular, in this case, the core tube can have a constant wall thickness in the separation region, in particular a wall thickness that is at least substantially the same as outside the separation region.

[0009] Furthermore, it is proposed that the material of the integral core tube wall of the core tube in the separation region of the core tube has a structure with poor magnetic conductivity, in particular a metal structure, such as a martensitic structure, and that the material of the integral core tube wall of the core tube outside the separation region of the core tube has a structure with good magnetic conductivity, in particular a metal structure, such as a ferrite structure. As a result, effective magnetic separation can be achieved advantageously while maintaining a high gas tightness and in particular also while maintaining a high stability of the core tube. In particular, the core tube is initially made entirely of a material with a structure with good magnetic conductivity, in particular a metal structure, such as a ferrite structure, and is treated after production in such a way that the material in the separation region undergoes a structural transformation to a structure with poor magnetic conductivity, in particular a metal structure, such as a martensitic structure. In particular, the material with a structure with poor magnetic conductivity extends over the entire wall thickness of the core tube in the separation region.

[0010] In addition, it is proposed that the magnetic separation of the core tube is at least partially achieved by a tapering of the wall thickness of the core tube wall of the core tube in the separation area of ​​the core tube. Thus, effective magnetic separation can be advantageously achieved while maintaining high air tightness. Advantageously, leakage due to gaps that may be generated during welding or brazing or due to surface roughness of elastomer seals can be avoided. In particular, the magnetic separation has no elastomers, welding points or brazing points. In particular, the wall thickness of the core tube wall in the separation area is so tapered that the magnetic field lines are automatically completely or at least almost completely drawn out of the material of the core tube during normal operation of the magnetic actuator. The "tapering" of the wall thickness should be understood in particular as a significant reduction in the wall thickness. "Tapering" should be understood in particular as a narrowing / thinning of the core tube wall. In addition to tapering, the material in the separation area can also undergo a structural transformation to a poorly magnetically conductive structure, such as a martensitic structure, or no structural transformation (i.e., still having a good magnetically conductive structure, such as a ferrite structure).

[0011] When the core tube wall in the separation region tapers to at least one third, preferably at least one fifth, of the average wall thickness of the core tube wall outside the separation region, a good magnetic separation can be advantageously achieved while achieving high gas tightness, in particular hydrogen tightness. In particular, the wall thickness of the core tube wall outside the separation region and in particular at a distance from the one-piece magnetic core is at least substantially constant.

[0012] Here, when the in particular tapered wall thickness of the core tube wall in the separation region is less than 0.5 mm, preferably less than 0.4 mm, advantageously less than 0.3 mm, preferably less than 0.2 mm and particularly preferably greater than 0.1 mm, good magnetic separation can be advantageously achieved while achieving high gas tightness, in particular hydrogen tightness. In addition, sufficient stability of the core tube, for example bending resistance, can advantageously be ensured.

[0013] In addition, it is proposed that the outer diameter of the core tube is reduced in the especially tapered separation area, especially relative to the average outer diameter of the core tube outside the separation area, and / or the inner diameter of the core tube is increased in the especially tapered separation area, especially relative to the average inner diameter of the core tube outside the separation area. Thus, a simple structure can be advantageously achieved. For example, the tapered portion in the separation area can be produced by screwing a groove on the outer periphery of the core tube and / or the inner periphery of the core tube. In particular, the tapered portion in the separation area is uniform (as a uniform groove, i.e., for example as a groove of equal depth and width) and / or rotationally symmetrically configured. In particular, the core tube has a rotating groove on the outer wall that forms the separation area. Alternatively or additionally, the core tube has a rotating groove on the inner wall that forms the separation area. Here, the normal vector of the outer wall of the core tube is especially in the radial direction of the core tube. Here, the normal vector of the inner wall of the core tube is especially opposite to the radial direction of the core tube.

[0014] Furthermore, it is proposed that the tapered wall thickness in the separation region is at least substantially constant over at least a large part of the entire axial extension of the tapered portion. This allows an advantageous magnetic field curve to be achieved. Advantageously, an exact and / or locally exact magnetic separation can be achieved. Furthermore, a simple construction can be advantageously achieved. "Majority" is to be understood in particular as 51%, preferably 66%, preferably 75% and particularly preferably 90%. In particular, the wall surface of the core tube is designed to be flat and / or to extend parallel to the axial direction of the core tube at least in a large part of the separation region. The axial extension is designed as an extension of the object in the axial direction of the object.

[0015] Furthermore, it is proposed that the space produced by the taper in the separation region, in particular the groove produced by the taper in the separation region, is designed without material filling, in particular without solder etc. This advantageously allows a simple construction to be achieved.

[0016] When the tapered portion has a magnetic field guide profile at least on the magnetic core side and / or when the tapered portion has another magnetic field guide profile at least on the core tube side, a particularly advantageous curve of the magnetic field, in particular a particularly good magnetic separation of the core tube can also be achieved. In particular, the magnetic field guide profile constitutes the conical geometry of the core tube to influence and / or design the force-displacement characteristic curve of the magnetic actuator with the core tube. Advantageously, the force-displacement characteristic curve of the magnetic actuator with the core tube can be determined by selecting the shape of the magnetic field guide profile. In particular, the magnetic field guide profile is arranged at the lateral boundary of the tapered portion / groove, which lateral boundary at least substantially defines the tapered portion / groove in a direction extending parallel to the longitudinal direction. The magnetic field guide profile can be configured as a sequence of edges, angles and / or radii. In particular, the magnetic field guide profile comprises at least two different radii. In particular, the magnetic field guide profile comprises at least two edges. However, it is also conceivable that the magnetic field guide profile has only one edge and two surfaces or only one radius and two surfaces, etc. In particular, the magnetic field guide profile is designed in such a way that a particularly good and / or particularly lossless transition of the magnetic field from the magnetic core to the magnetic armature can be performed. In particular, the shape of the magnetic field guide profile is determined in a calculation and / or simulation step. In particular, the magnetic field guide profile can have different shapes depending on the corresponding desired force-displacement characteristic curve of the magnetic actuator. In particular, the magnetic field guide profile is designed rotationally symmetrically. In particular, the magnetic field guide profile is screwed into the core tube. In particular, the lateral boundary of the tapered portion / groove opposite to the lateral boundary with the magnetic field guide profile can be free of another magnetic field guide profile, or can also have a magnetic field guide profile of the same shape or a different shape.

[0017] Furthermore, it is proposed that the magnetic field guiding contour, viewed in the axial direction, extends completely in a radial region starting from the axial direction, in which radial region the maximum reluctance gap that can be produced between the magnetic core and the magnetic armature of the magnetic actuator device in normal operation is also located, and / or that the further magnetic field guiding contour, viewed in the axial direction, extends completely outside a radial region starting from the axial direction, in which radial region the maximum reluctance gap that can be produced between the magnetic core and the magnetic armature of the magnetic actuator device in normal operation is also located. As a result, a particularly advantageous course of the magnetic field and, in particular, a particularly good magnetic separation of the core tube can be achieved.

[0018] Furthermore, it is proposed that the separation region, which completely comprises the taper, has a total extension in the axial direction of at most 25%, preferably at most 15%, of the total extension of the magnetic core in the axial direction, of at most 25%, preferably at most 15%, of the total extension of the magnetic armature of the magnetic actuator device in the axial direction, and / or of at most 25%, preferably at most 15%, of the total extension of the magnetic coil of the magnetic actuator device in the axial direction. This advantageously allows a simple construction. Advantageously, good stability can be achieved. Furthermore, an exact and / or locally exact magnetic separation can advantageously be achieved. In particular, the total extension of the taper in the separation region is measured parallel to the axial direction of the core tube.

[0019] Furthermore, it is proposed that the magnetic actuator device has a magnetic anti-stick element, which is arranged completely outside the separation area in the axial direction, in particular, completely outside the radial area starting from the axial direction, the extension of which in the axial direction is bounded by the extension of the tapered portion in the axial direction. This allows for advantageous magnetic field guidance and / or magnetic armature movement. In particular, the anti-stick element is made of non-magnetic material. In particular, the anti-stick element is disc-shaped. In particular, the anti-stick element is arranged and / or fastened, in particular bonded, on the side of the magnetic core facing the core tube. In particular, the anti-stick element is arranged to prevent the magnetic armature from (magnetically) adhering to the magnetic core, in particular due to residual magnetization of the magnetic core. Advantageously, a high dynamics of the magnetic actuator device can be achieved thereby. The anti-stick element is in particular arranged to ensure a minimum distance between the magnetic core and the magnetic armature. The magnetic armature is in particular at least mostly made of magnetic material, such as iron.

[0020] In addition, it is proposed that the core tube is provided with a hydrogen diffusion inhibiting coating at least in sections on its inner side and / or its outer side. Thus, good applicability for hydrogen applications can be advantageously achieved, for example in the field of fuel cells and / or electrolysis devices. Advantageously, high sealing can be achieved, so that hydrogen can be particularly prevented from escaping from the inside of the core tube. Advantageously, leakage can be avoided, especially for the smallest known gas molecule H2 molecule. In particular, the coating is arranged to protect iron or steel from the penetration of hydrogen (H2) very effectively. For example, the coating can be composed of a MAX phase material that is particularly suitable and / or arranged for hydrogen diffusion inhibition. For example, the coating is composed of a MAX phase layer made of (oxidized) titanium, aluminum and nitrogen (Ti2AIN). In particular, the hydrogen diffusion inhibiting coating is arranged to reduce the hydrogen diffusion through the core tube, especially in the separation region, by at least a factor of 2, preferably at least a factor of 4, preferably at least a factor of 10 and particularly preferably at least a factor of 25, especially compared to the separation region without coating and otherwise identical. In particular, a large part of the inner and / or outer side of the core tube or the entire inner and / or outer side of the core tube can be provided with a hydrogen diffusion inhibiting coating. However, preferably, at least a large part of the separation area, preferably at least the entire separation area, particularly preferably at least the entire tapered portion is provided with a hydrogen diffusion inhibiting coating on the inner and / or outer side.

[0021] Furthermore, a magnetic actuator for hydrogen applications, in particular for fuel cell and / or electrolyser applications, is proposed. Advantageously, a high degree of tightness can be achieved.

[0022] Furthermore, a method for producing a magnetic actuator device is proposed, wherein the magnetic core and the core tube are formed as a one-piece component, in particular cut out from a one-piece block, and wherein the magnetic separation of the core tube is achieved by a taper of the wall thickness of the core tube wall of the core tube, which forms an unfilled separation region. This advantageously makes it possible to achieve a simple construction with particularly high hydrogen tightness.

[0023] Furthermore, a method for producing a magnetic actuator device is proposed, wherein the magnetic core and the core tube are formed as a one-piece component, in particular cut out from a one-piece block, and wherein the magnetic separation of the one-piece core tube is achieved by demagnetizing the material of the core tube wall of the core tube in the separation region of the core tube. As a result, a simple construction with particularly high hydrogen tightness and particularly high core tube stability can advantageously be achieved.

[0024] Furthermore, it is proposed that the demagnetization of the material of the core tube wall is produced by inductive heating of the separation region or by laser annealing of the separation region.Thereby, a simple and / or cost-effective and / or fast production method can advantageously be provided.

[0025] In this context, the magnetic actuator device according to the invention, the magnetic actuator according to the invention and / or the method according to the invention should not be limited to the applications and embodiments described above. In particular, the magnetic actuator device according to the invention, the magnetic actuator according to the invention and / or the method according to the invention can have a number of different elements, components and units than those mentioned herein to perform the functional modes described herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further advantages result from the following description of the drawings. The drawings show embodiments of the invention. The drawings, the description and the claims contain many combined features. It will also be expedient for a person skilled in the art to consider these features individually and to combine them into meaningful further combinations.

[0027] In the attached picture:

[0028] Figure 1 shows a schematic cross-sectional view of a magnetic actuator having a magnetic actuator arrangement;

[0029] Figure 2 shows the separation region of the magnetic actuator device Figure 1 A magnified image of

[0030] Figure 3 A schematic flow chart showing a method for manufacturing a magnetic actuator device; and

[0031] Figure 4 A separate region of an alternative magnetic actuator arrangement is shown in cross-section. DETAILED DESCRIPTION

[0032] Figure 1 A schematic cross-sectional view of a magnetic actuator 70 is shown. The magnetic actuator 70 is configured for hydrogen applications. The magnetic actuator 70 is configured for fuel cell applications and / or electrolysis device applications. The magnetic actuator 70 has a magnetic actuator device 50. The magnetic actuator device 50 is configured as a hydrogen-tight magnetic actuator device. The magnetic actuator device 50 has a magnetic core 10. The magnetic actuator device 50 has a core tube 12. The core tube 12 and the magnetic core 10 are integrally formed. The core tube 12 has an axial direction 14. The axial direction 14 extends parallel to the inner opening 72 of the core tube 12. The magnetic core 10 is completely closed on one side along the axial direction 14 of the core tube 12. The core tube 12 is completely closed on one side by the magnetic core 10 along the axial direction 14. As a result, the hydrogen tightness of the core tube 12, especially the hydrogen tightness of the inner opening 72 of the core tube 12 facing the outside, can be achieved.

[0033] The core tube 12 is designed to be at least substantially magnetically separable along its axial direction 14. The core tube 12 forms a separation region 22. The core tube 12 is magnetically separable in the separation region 22. The core tube 12 has a core tube wall 20. The core tube wall 20 has an average wall thickness 24 outside the separation region 22 (see Figure 2 The average wall thickness 24 of the core tube wall 20 outside the separation region 22 is greater than 0.5 mm. The core tube wall 21 has a tapered wall thickness 18 in the separation region 22 (see Figure 2 ). The wall thickness 18 of the core tube wall 20 in the separation region 22 is less than 0.5 mm. The magnetic separation of the core tube 12 in the separation region 22 is achieved by a taper 16 of the wall thickness 18 of the core tube wall 20 of the core tube 12 in the separation region 22 relative to an average wall thickness 24 outside the separation region 22. The core tube wall 20 tapers in the separation region 22 to at least one third of the average wall thickness 24 of the core tube wall 20 outside the separation region 22. The tapered wall thickness 18 in the separation region 22 is at least substantially constant over the axial extension 30 of the taper 16 (see Figure 2 ).

[0034] The core tube 12 has an outer diameter 26. The outer diameter 26 of the core tube 12 is reduced in the separation region 22. The core tube 12 has an inner diameter 28. In the figure, the inner diameter 28 of the core tube 12 is constant. However, it is conceivable that, as an additional or alternative to reducing the outer diameter 26 of the core tube 12, the inner diameter 28 of the core tube is increased (not shown). A (free) space is generated in the separation region 22 by the tapered portion 16. The space generated by the tapered portion 16 is configured to be not filled with material. The separation region 22, which completely includes the tapered portion 16, has a total extension 44 in the axial direction 14, which is less than 15% of the total extension 46 of the magnetic core 10 in the axial direction 14.

[0035] The magnetic actuator 70 has a magnetic coil 54. A current can be applied to the magnetic coil 54 to generate a magnetic field. The magnetic actuator device 50 has a magnetic armature 34. The magnetic armature 34 is partially introduced into the core tube 12. The magnetic armature 34 is movably supported in the core tube 12. The magnetic armature 34 can be moved in the core tube 12 by the magnetic field of the magnetic coil 54. The magnetic actuator device 50 has a return spring 74. The return spring 74 is clamped between the magnetic core 10 and the magnetic armature 34. The return spring 74 presses the magnetic armature 34 away from the magnetic core 10 when the magnetic coil 54 is not energized. The magnetic actuator device 50 forms a reluctance gap 38. In the energized state, the magnetic armature 34 strives to close the reluctance gap 38 and is thereby pressed in the direction of the magnetic core 10. The magnetic actuator 70 has an actuating element 76. The actuating element 76 is used to transmit the movement of the magnetic armature 34 to the outside. The total extension 44 of the separation region 22 in the axial direction 14, which completely includes the taper 16, is less than 15% of the total extension 48 of the magnetic armature 34 in the axial direction 14. The total extension 44 of the separation region 22 in the axial direction 14, which completely includes the taper 16, is less than 15% of the total extension 52 of the magnetic coil 54 in the axial direction 14. The magnetic actuator device 50 has a magnetic anti-stick element 56.

[0036] Figure 2 The schematic diagram shows an enlarged view of a detail of a magnetic actuator device 50 in a separation region 22 with a tapered portion 16. The tapered portion 16 has a magnetic field guide contour 32 on the magnetic core side. The magnetic field guide contour 32, viewed in the axial direction 14, extends completely within a radial region 36 starting from the axial direction 14, in which radial region 36 the maximum reluctance gap 38 that can be produced between the magnetic core 10 and the magnetic armature 34 in normal operation is also located. The tapered portion 16 has a further magnetic field guide contour 40 on the core tube side. The magnetic field guide contour 32 and the further magnetic field guide contour 40 are designed differently from each other. The further magnetic field guide contour 32, viewed in the axial direction 14, extends completely outside a radial region 42 starting from the axial direction 14, in which radial region 42 the maximum reluctance gap 38 that can be produced in normal operation is also located. Figure 1 and Figure 2 The reluctance gap 38 illustrated in the figure represents the maximum possible reluctance gap 38 of the embodiment shown. The anti-stick element 56 is arranged completely outside the separation region 22 in the axial direction 14. The anti-stick element 56 is arranged completely outside a radial region 58 starting from the axial direction 14, the extension 62 of which in the axial direction 14 is delimited by the extension 60 of the taper 16 in the axial direction 14.

[0037] The magnetic actuator device 50 has a hydrogen diffusion inhibiting coating 68. The hydrogen diffusion inhibiting coating 68 is applied to a portion of the inner side 64 of the core tube 12. The hydrogen diffusion inhibiting coating 68 is applied to a portion of the outer side 66 of the core tube 12. The core tube 12 is provided with a hydrogen diffusion inhibiting coating 68 at least in sections on the inner side 64 and / or the outer side 66. Alternatively, the hydrogen diffusion inhibiting coating 68 can also be applied only to one of the two side portions 64, 66 of the core tube 12. The hydrogen diffusion inhibiting coating 68 can be designed as a MAX phase layer of (oxidized) titanium, aluminum and nitrogen (Ti2AIN). Of course, alternative or additional hydrogen diffusion inhibiting coatings 68 are also conceivable.

[0038] Figure 3 A schematic flow chart of a method for producing a magnetic actuator device 50 is shown. In at least one method step 78, the magnetic core 10 and the core tube 12 are manufactured as a one-piece component. In method step 78, the magnetic core 10 and the core tube 12 are cut out of a single one-piece block. Here, the magnetic core 10 and the core tube 12 are manufactured so that the magnetic core 10 completely encloses the core tube 12 on one side. In at least another method step 80, the magnetic separation of the core tube 12 is achieved by a taper 16 of the wall thickness 18, 24 of the core tube wall 20 of the core tube 12. Here, the taper 16 constitutes an unfilled separation area 22. In method step 80, the taper 16 is produced by screwing in a groove on the outer side 66 of the core tube 12 and / or by screwing in a groove on the inner side 64 of the core tube 12. In at least one method step 84, which is an alternative or additional method step 80, magnetic separation of the one-piece core tube 12 is achieved by demagnetizing the material of the core tube wall 20 of the core tube 12 in the separation region 22 of the core tube 12. In method step 84, the demagnetization of the material of the core tube wall 20 is produced by inductive heating of the separation region 22 or by laser annealing of the separation region 22. In at least one method step 82, a hydrogen diffusion inhibiting coating 68 is applied to the outer side 66 of the core tube 12 and / or to the inner side 64 of the core tube 12. Here, in method step 82, the hydrogen diffusion inhibiting coating 68 is applied at least to the surface of the core tube 12 located in the separation region 22. In normal operation of the magnetic actuator 70, the inner opening 72 of the core tube 12 is filled with hydrogen.

[0039] Figure 4 The following description and drawings are essentially limited to the differences between the embodiments, wherein for components with the same names, in particular for components with the same reference numerals, reference can also be made in principle to the drawings and / or the description of other embodiments, in particular Figures 1 to 3 Description of embodiments of the present invention.

[0040] Figure 4A detailed enlargement of an alternative magnetic actuator device 50' in the separation region 22 of the core tube 12 is schematically shown. Outside the separation region 22, the alternative magnetic actuator device 50' is constructed essentially the same as the magnetic actuator device 50 shown in the previous figures. The separation region 22 is designed without a tapered portion. The core tube 12 is magnetically separated in the separation region 22. The core tube 12 has a core tube wall 20. The core tube wall 20 has an average wall thickness 24 outside the separation region 22. The core tube wall 20 has an average wall thickness 18 inside the separation region 22. The wall thicknesses 18, 24 inside and outside the separation region 22 are at least essentially the same. The magnetic separation of the one-piece core tube 12 is achieved by demagnetizing the material of the core tube wall 20 of the core tube 12 in the separation region 22 of the core tube 12. The material of the one-piece core tube wall 20 of the core tube 12 in the separation region 22 of the core tube 12 has a structure that is not magnetically conductive, in particular a metal structure. The material of the integral core tube wall 20 of the core tube 12 within the separation region 22 of the core tube 12 has a martensitic structure. The material of the integral core tube wall 20 of the core tube 12 outside the separation region 22 of the core tube 12 has a structure with good magnetic conductivity, especially a metal structure. The material of the integral core tube wall 20 of the core tube 12 outside the separation region 22 of the core tube 12 has a ferrite structure.

[0041] Figures 1 to 3 The magnetic actuator device 50 of EMBODIMENT 1 may also have, in addition to the taper 16 , the structural transition in the separation region 22 described in connection with the alternative magnetic actuator device 50 ′. Description of reference numerals: 10 Magnetic core 12 core tube 14 Axial direction 16 Taper 18 Wall thickness 20 Core tube wall 22 Separation Area 24 Wall thickness 26 outer diameter 28 inner diameter 30 Axial extension 32 Field-guided contours 34 Magnetic armature 36 Radial Area 38 Reluctance gap 40 Another magnetic field guide profile 42 Radial Area 44 Total extension 46 Total extension 48 Total extension 50 Magnetic actuator device 52 Total extension 54 Magnetic coil 56 Anti-adhesive components 58 Radial Area 60 Extension 62 Extension 64 Inside 66 Outer 68 Hydrogen diffusion inhibition coating 70 Magnetic Actuator 72 inner opening 74 Return spring 76 Actuating element 78 Methods and Steps 80 Methods and Steps 82 Methods and Steps 84 Methods and Steps

Claims

1. A magnetic actuator device (50, 50'), in particular a hydrogen-sealed magnetic actuator device, comprising at least one magnetic core (10) and at least one core tube (12), the core tube (12) being at least substantially magnetically decoupled along its axial direction (14), characterized in that: In order to achieve hydrogen tightness, the magnetic core (10) is configured to be completely closed at least on one side along the axial direction (14), and the core tube (12) is formed integrally with the magnetic core (10).

2. The magnetic actuator device (50, 50') according to claim 1, characterized in that The magnetic separation of the one-piece core tube (12) is achieved at least in part by demagnetizing the material of the core tube wall (20) of the core tube (10) in the separation area (22) of the core tube (10), the demagnetization being in particular produced by a thermal microstructural transformation of the material of the core tube wall (20), for example by means of induction or laser annealing.

3. The magnetic actuator device (50, 50') according to claim 1 or 2, characterized in that The material of the integrated core tube wall (20) of the core tube (12) in the separation area (22) of the core tube (12) has a structure with poor magnetic conductivity, especially a metal structure, such as a martensitic structure, and the material of the integrated core tube wall (20) of the core tube (12) outside the separation area (22) of the core tube (12) has a structure with good magnetic conductivity, especially a metal structure, such as a ferrite structure.

4. The magnetic actuator device (50) according to any one of the preceding claims, characterized in that The magnetic separation of the core tube (12) is achieved at least in part by a tapering (16) of the wall thickness (18) of the core tube wall (20) of the core tube (12) in the separation region (22) of the core tube (12).

5. The magnetic actuator device (50) according to claim 4, characterized in that The core tube wall (20) in the separation region (22) tapers to at least one third of the average wall thickness (24) of the core tube wall (20) outside the separation region (23).

6. The magnetic actuator device (50) according to claim 4 or 5, characterized in that The wall thickness (18) of the core tube wall (20) in the separation region (22) is less than 0.5 mm.

7. The magnetic actuator device (50) according to any one of claims 4 to 6, characterized in that The outer diameter (26) of the core tube (12) in the separation region (22) is reduced and / or the inner diameter (28) of the core tube (12) in the separation region (22) is increased.

8. The magnetic actuator device (50) according to any one of claims 4 to 7, characterized in that The tapered wall thickness (18) in the separation region (22) is at least substantially constant over at least a majority of the entire axial extension (30) of the tapered portion (16).

9. The magnetic actuator device (50) according to any one of claims 4 to 8, characterized in that The space generated by the tapered portion (16) in the separation region (22), in particular the recess generated by the tapered portion (15) in the separation region (22), is designed to be free of material filling.

10. The magnetic actuator device (50) according to any one of claims 4 to 9, characterized in that The tapered portion (16) has a magnetic field guiding contour (32) at least on the core side.

11. The magnetic actuator device (50) according to claim 10, characterized in that A magnetic armature (34), wherein the magnetic field guide contour (32) extends completely in a radial region (36) starting from the axial direction (14) when viewed in the axial direction (14), and the maximum reluctance gap (38) that can be generated between the magnetic core (10) and the magnetic armature (34) in normal operation is also located in the radial region (36).

12. The magnetic actuator device (50) according to any one of claims 4 to 11, characterized in that The tapered portion (16) has a further magnetic field guiding contour (40) at least on the core tube side.

13. The magnetic actuator device (50) according to claim 12, characterized in that A magnetic armature (34), wherein the further magnetic field guiding contour (32) extends completely outside a radial region (42) starting from the axial direction (14) when viewed in the axial direction (14), and the maximum reluctance gap (38) that can be generated between the magnetic core (10) and the magnetic armature (34) in normal operation is also located in the radial region (42).

14. The magnetic actuator device (50) according to any one of claims 4 to 13, characterized in that The separation region (22) completely including the tapered portion (16) has a total extension (44) in the axial direction (14), which is at most 25%, preferably at most 15%, of a total extension (46) of the magnetic core (10) in the axial direction (14), at most 25%, preferably at most 15% of a total extension (48) of the magnetic armature (34) of the magnetic actuator device (50) in the axial direction (14) and / or at most 25%, preferably at most 15% of a total extension (52) of the magnetic coil (54) of the magnetic actuator device (50) in the axial direction (14).

15. A magnetic actuator device (50) according to any one of claims 4 to 14, characterised in that A magnetic anti-sticking element (56), wherein the magnetic anti-sticking element (56) is completely arranged outside the separation area (22) along the axial direction (14), in particular, completely arranged outside the radial area (58) starting from the axial direction (14), and the extension (62) of the radial area (58) along the axial direction (14) is defined by the extension (60) of the tapered portion (16) along the axial direction (14).

16. A magnetic actuator device (50, 50') according to any one of the preceding claims, characterized in that The core tube (12) is provided at least in sections with a hydrogen diffusion inhibiting coating (68) on the inner side (64) and / or the outer side (66).

17. A magnetic actuator (70) for hydrogen applications, in particular for fuel cell and / or electrolyser applications, having a magnetic actuator device (50, 50') according to any of the preceding claims.

18. A method for producing a magnetic actuator device (50), in particular a magnetic actuator device according to any one of claims 1 to 16, the magnetic actuator device (50) having a magnetic core (10) and a core tube (12), the core tube (12) being at least substantially magnetically decoupled from the magnetic core (10), wherein: The magnetic core (10) and the core tube (12) are manufactured as a one-piece component, in particular cut out from a one-piece block, and the magnetic separation of the core tube (12) is achieved by a taper (16) of the wall thickness (18, 24) of the core tube wall (20) of the core tube (12) forming an unfilled separation region (22).

19. A method for producing a magnetic actuator device (50, 50'), in particular a magnetic actuator device according to any one of claims 1 to 16, the magnetic actuator device (50, 50') having a magnetic core (10) and a core tube (12), the core tube (12) being at least substantially magnetically decoupled from the magnetic core (10), wherein: The magnetic core (10) and the core tube (12) are made as a one-piece component, in particular cut out from a one-piece block, and wherein the magnetic separation of the one-piece core tube (12) is achieved by demagnetizing the material of the core tube wall (20) of the core tube (12) in the separation area (22) of the core tube (12).

20. The method according to claim 19, characterized in that Demagnetization of the material of the core tube wall (20) is produced by inductive heating of the separation region (22) or by laser annealing of the separation region (22).

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