Magnetic actuator device, magnetic actuator for hydrogen gas applications, and production method

Abstract

The invention relates to a magnetic actuator device (50, 50'), in particular a hydrogen-gas-tight magnetic actuator device, having at least one magnetic core (10) and having at least one core tube (12), which is at least substantially magnetically separated along its axial direction (14). It is proposed that, in order to achieve hydrogen gas tightness, the magnetic core (10) is fully closed in the axial direction (14) at least on one side, and the core tube (12) is formed monolithically with the magnetic core (10).

Description

[0001] Magnetic actuator device, magnetic actuator for hydrogen gas applications and method for manufacturing

[0002] State of the art

[0003] The invention relates to a magnetic actuator device according to the preamble of claim 1, a magnetic actuator according to claim 17 and methods according to claims 18 and 19.

[0004] DE 102 35 644 B4 has already proposed a magnetic actuator device having at least one monolithic magnetic core and at least one core tube which is at least substantially magnetically separated along its axial direction.

[0005] The object of the invention is, in particular, to provide a generic device with advantageous properties regarding suitability for hydrogen gas applications. This object is achieved according to the invention by the features of patent claims 1, 17, 18, and 19, while advantageous embodiments and further developments of the invention can be found in the subclaims.

[0006] Advantages of the invention

[0007] The invention is based on a magnetic actuator device, in particular a hydrogen gas-tight magnetic actuator device, with at least one, in particular monolithic, magnetic core and with at least one core tube which is at least substantially magnetically separated along its axial direction. It is proposed that in order to achieve hydrogen gas tightness, in particular a leak rate of less than 10 -4 mbar l / s, preferably less than 10 -5mbar l / s and preferably less than 10 -6mbar l / s, the magnetic core is completely closed at least on one side in the axial direction and the core tube is formed monolithically with the magnetic core. This advantageously makes it suitable for hydrogen gas applications, for example in the field of fuel cells and / or electrolyzers. Advantageously, a high level of tightness can be achieved, which in particular can prevent hydrogen from escaping from the interior of the core tube. Advantageously, leaks, especially for the smallest known gas molecules - H2 molecules - can be avoided. Advantageously, sealing points such as soldering or welding points can be completely dispensed with. Advantageously, the risk of leaks due to blowholes or the like can be kept low.In particular, a high degree of tightness, even for H2 molecules, can be advantageously achieved without significantly impairing the functionality or functional parameters of the magnetic actuator device. In particular, the hydrogen-tight magnetic actuator device has a leakage rate of less than 10. -4 mbar l / s, preferably less than 10 -5 mbar l / s and preferably less than 10 -6mbar l / s. A "magnetic actuator device" is understood to mean, in particular, a functional component, in particular a structural and / or functional component, of a magnetic actuator. A "magnetic actuator" is understood to mean, in particular, an actuator, preferably based on the reluctance principle, which performs mechanical work through translational movements, such as a solenoid valve or a magnetic switch. In this context, a magnetic actuator is understood to mean, in particular, a device designed to convert electrical power into mechanical power by means of a magnetic field.A “core tube” is to be understood in particular as a component of a magnetic actuator made of a magnetic flux-conducting (magnetic flux-bundling), in particular (soft) magnetic, preferably ferromagnetic, material, which preferably forms at least a large part of the magnetic core of the magnetic actuator and / or which is arranged at least partially, preferably at least a large part, in the interior of a magnetic coil of the magnetic actuator. In particular, the magnetic material is designed as a magnetic material. In particular, the core tube is formed at least largely from a 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 tubular. In particular, the core tube is intended to at least partially accommodate a magnetic armature of the magnetic actuator.In particular, the core tube is intended to at least partially form a displacement chamber for the magnet armature of the magnetic actuator. In particular, the displacement chamber for the magnet armature is formed by the tubular part of the core tube. In particular, the longitudinal direction of the core tube runs parallel to a tube axis, in particular a rotational symmetry axis, of the tubular part of the core tube. In particular, the longitudinal direction of the core tube, when mounted in a magnetic actuator, runs parallel to a coil axis of the magnetic coil of the magnetic actuator. “Intended” should be understood in particular to mean specially programmed, designed and / or equipped. The fact that an object is intended for a specific function should be understood in particular to mean that the object fulfills and / or executes this specific function in at least one application and / or operating state.

[0008] A “magnetic separation” of the core tube should be understood in particular as meaning that two partial regions of the core tube (made of the same magnetic material) are separated from one another in such a way that at least a large portion of all magnetic field lines running in a first partial region of the core tube are prevented from directly passing into the second partial region of the core tube. A “magnetic separation” of the core tube should be understood in particular as an interruption of the magnetic flux conductivity of the core tube. In particular, the magnetic separation is intended to interrupt the magnetic flux through the core tube along the axial direction of the core tube. In particular, the magnetic separation is intended to redirect the magnetic field lines of the magnetic field of the magnetic coil in such a way that the magnetic field lines are guided out of the core tube in the region of the magnetic separation.In particular, the magnetic separation is arranged in a region of the core tube which, in the assembled state of the magnetic actuator, is arranged in the coil interior of the magnetic coil. In particular, the magnetic separation is arranged in a region of the core tube which, in the assembled state of the magnetic actuator, forms the displacement space for the magnetic armature. In particular, the axial direction of the core tube runs parallel to a longitudinal direction of the core tube. In particular, the axial direction of the core tube runs parallel to a main extension direction of the core tube. A “main extension direction” of an object should be understood in particular to mean a direction which runs parallel to a longest edge of a smallest geometric cuboid which just completely encloses the object. “Completely closed” should be understood in particular to mean free of perforations or openings in the axial direction.In particular, the magnetic core on the closed side is free of any further elements or components penetrating the magnetic core, such as valve tappets or the like. In particular, the entire core tube is formed monolithically with the magnetic core. In particular, the core tube is free of separate separating elements, e.g. materially connected to the core tube, which would separate the core tube into two or more unconnected parts. The term “monolithic” is also intended to be understood in particular as meaning one-piece (molded in one piece or formed from a single blank, a mass and / or a casting). Furthermore, it is proposed that the magnetic separation of the monolithic core tube is at least partially achieved by demagnetizing a material of the core tube wall of the core tube in a separating region of the core tube, in particular generated by a thermal structural transformation of the material of the core tube wall, e.g.by induction or laser annealing. This advantageously allows efficient magnetic separation to be achieved while maintaining high gas tightness and high stability of the core tube. In particular, in this case, the core tube can have an unchanged wall thickness in the separation area, in particular a wall thickness that is at least substantially identical to that outside the separation area.

[0009] It is also proposed that the material of the monolithic core tube wall of the core tube in the separation region of the core tube has a magnetically poorly conductive structure, in particular a metal structure, e.g. a martensitic structure, and that the material of the monolithic core tube wall of the core tube outside the separation region of the core tube has a magnetically highly conductive structure, in particular a metal structure, e.g. a ferritic structure. This advantageously allows efficient magnetic separation to be achieved while maintaining high gas tightness and, in particular, also while maintaining high stability of the core tube. In particular, the core tube is originally made entirely of a material with a magnetically highly conductive structure, in particular a metal structure, e.g.a ferritic structure, and treated after production in such a way that the material in the separation zone undergoes a structural transformation to a structure with poor magnetic conductivity, in particular a metallic structure, e.g., a martensitic structure. In particular, the material with the poor magnetic conductivity in the separation zone extends across the entire wall thickness of the core tube.

[0010] It is further proposed that the magnetic separation of the core tube be realized at least partially by tapering the wall thickness of a core tube wall of the core tube in a separation region of the core tube. This advantageously makes it possible to achieve efficient magnetic separation while maintaining a high level of gas tightness. Leakage due to cavities or the like, which can arise during welding or soldering, or due to surface roughness of elastomer seals or the like, can advantageously be avoided. In particular, the magnetic separation is free of elastomers, welds, or solder joints. In particular, the wall thickness of the core tube wall is tapered in the separation region such that the magnetic field lines are automatically guided completely or at least almost completely out of the material of the core tube during normal operation of the magnetic actuator.A "tapering" of the wall thickness is understood to mean, in particular, a significant reduction in the wall thickness. A "tapering" is understood to mean, in particular, a narrowing / thinning of the core tube wall. In addition to the tapering, the material in the separation area can also undergo a structural transformation to a poorly magnetically conductive structure, e.g., martensitic, or be free of any structural transformation (i.e., continue to exhibit a highly magnetically conductive structure, e.g., ferrite).

[0011] If the core tube wall in the separation region is tapered to at least one-third, preferably at least one-quarter, and preferably at least one-fifth, of the average wall thickness of the core tube wall outside the separation region, good magnetic separation can be advantageously achieved while simultaneously achieving high gas tightness, in particular hydrogen gas tightness. In particular, the wall thickness of the core tube wall outside the separation region and in particular away from the monolithic magnetic core is at least substantially constant.

[0012] If the wall thickness of the core tube wall, especially the tapered one, 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 more than 0.1 mm, good magnetic separation can be achieved while simultaneously achieving high gas tightness, particularly hydrogen gas tightness. Furthermore, sufficient stability of the core tube, e.g., against bending, can be advantageously ensured.

[0013] It is also proposed that an outer diameter of the core tube in the, in particular tapered, separation region is reduced, in particular relative to a mean outer diameter of the core tube outside the separation region, and / or that an inner diameter of the core tube in the, in particular tapered, separation region is increased, in particular relative to a mean inner diameter of the core tube outside the separation region. This advantageously makes it possible to achieve a simple design. For example, the taper in the separation region can be created by screwing in a groove on the outer circumference of the core tube and / or on an inner circumference of the core tube. In particular, the taper in the separation region is uniform (as a uniform groove, e.g. as a groove of equal depth and width) and / or rotationally symmetrical. In particular, the core tube has a circumferential groove on an outer wall, which forms the separation region.Alternatively or additionally, the core tube has a circumferential groove on an inner wall, which forms the separation area. A normal vector of the outer wall of the core tube points in particular in the radial direction of the core tube. A normal vector of the inner wall of the core tube points in particular 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 an entire axial extension of the taper. This makes it possible to achieve an advantageous magnetic field profile. Advantageously, a precise and / or spatially accurate magnetic separation can be achieved. Furthermore, a simple construction can advantageously be achieved. A large part is to be understood in particular as 51%, preferably 66%, more preferably 75% and particularly preferably 90%. In particular, a wall surface of the core tube is designed to be flat and / or to run 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 an object along the axial direction of an object.

[0015] Additionally, it is proposed that a space created by the tapering in the separation area, in particular a groove created by the tapering in the separation area, be designed free of any material filling, in particular free of solder or the like. This advantageously allows for a simple construction.

[0016] If the taper has a magnetic field guiding contour at least on the magnetic core side and / or if the taper has a further magnetic field guiding contour at least on the core tube side, a particularly advantageous course of the magnetic field, in particular a particularly good magnetic separation of the core tube, can be achieved. In particular, the magnetic field guiding contour forms a conical geometry of the core tube for influencing and / or designing a force-displacement characteristic curve of the magnetic actuator having the core tube. Advantageously, a force-displacement characteristic curve of the magnetic actuator having the core tube can be determined by selecting the shape of the magnetic field guiding contour. In particular, the magnetic field guiding contour is arranged on a lateral boundary of the taper / groove, which bounds the taper / groove at least substantially in a direction running parallel to the longitudinal direction.The magnetic field guiding contour can be formed as a sequence of edges, angles, and / or radii. In particular, the magnetic field guiding contour comprises at least two different radii. In particular, the magnetic field guiding contour comprises at least two edges. However, it is also conceivable for the magnetic field guiding contour to have only one edge and two surfaces, or only one radius and two surfaces, or the like. In particular, the magnetic field guiding contour is designed such that a particularly good and / or particularly loss-free transition of the magnetic field from the magnetic core to the magnetic armature can occur. In particular, the shape of the magnetic field guiding contour is determined in a calculation and / or simulation step. In particular, the magnetic field guiding contour can have different shapes depending on the respectively desired force-displacement characteristic of the magnetic actuator. In particular, the magnetic field guiding contour is designed to be rotationally symmetrical.In particular, the magnetic field guide contour is screwed into the core tube. In particular, one of the lateral boundaries, including the lateral boundary of the taper / groove opposite the magnetic field guide contour, can be free of another magnetic field guide contour or can also have a magnetic field guide contour of the same or a different shape.

[0017] It is further proposed that the magnetic field guide contour, viewed in the axial direction, extends entirely within a radial region emanating from the axial direction, in which a maximum reluctance gap that can be generated between the magnetic core and the magnetic armature of the magnetic actuator device during normal operation also lies, and / or that the further magnetic field guide contour, viewed in the axial direction, extends entirely outside a radial region emanating from the axial direction, in which a maximum reluctance gap that can be generated between the magnetic core and the magnetic armature of the magnetic actuator device during normal operation also lies. This allows a particularly advantageous magnetic field profile, in particular a particularly good magnetic separation of the core tube, to be achieved.

[0018] Furthermore, it is proposed that the separation region completely encompassing the taper has a total extension in the axial direction which is at most 25%, preferably at most 15%, of a total extension of the magnetic core in the axial direction, which is at most 25%, preferably at most 15%, of a total extension of a magnetic armature of the magnetic actuator device in the axial direction and / or which is at most 25%, preferably at most 15%, of a total extension of a magnetic coil of the magnetic actuator device in the axial direction. This advantageously makes it possible to achieve a simple construction. Good stability can advantageously be achieved. Furthermore, precise and / or spatially accurate 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.It is also proposed that the magnetic actuator device comprise a magnetic anti-stick element which is arranged in the axial direction completely outside the separation region, in particular completely outside a radial region emanating from the axial direction, the extension of which in the axial direction is limited by an extension of the taper in the axial direction. This makes it possible to achieve advantageous magnetic field guidance and / or magnet armature movement. In particular, the anti-stick element is made of a 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 glued, on a side of the magnetic core facing the core tube. In particular, the anti-stick element is provided to prevent (magnetic) sticking of the magnetic armature to the magnetic core, in particular due to residual magnetization of the magnetic core.This also advantageously allows for high dynamics of the magnetic actuator device. The anti-stick element is provided, in particular, to ensure a minimum distance between the magnetic core and the magnetic armature. The magnetic armature is, in particular, formed at least largely from a magnetic material, e.g., iron.

[0019] Furthermore, it is proposed that the core tube be provided with a hydrogen diffusion-inhibiting coating on its inside and / or outside, at least in sections. This advantageously makes it suitable for hydrogen gas applications, for example, in the field of fuel cells and / or electrolyzers.

[0020] Advantageously, a high degree of tightness can be achieved, which in particular prevents the escape of hydrogen from the interior of the core tube. Leakage, especially for the smallest known gas molecules – H2 molecules – can be avoided. In particular, the coating is intended to effectively protect iron or steel from the penetration of hydrogen (H2). For example, the coating could be made of a MAX-phase material that is particularly suitable and / or intended for hydrogen diffusion inhibition. For example, the coating is formed as a MAX-phase layer of (oxidized) titanium, aluminum, and nitrogen (Ti2AIN).In particular, the hydrogen diffusion-inhibiting coating is intended to reduce hydrogen diffusion through the core tube, in particular in the separation region, by at least a factor of 2, preferably by at least a factor of 4, more preferably by at least a factor of 10, and particularly preferably by at least a factor of 25, in particular compared to a coating-free and otherwise identical separation region. In particular, a large part of an inner side and / or an outer side of the core tube or the entire inner side and / or outer side of the core tube can be provided with the hydrogen diffusion-inhibiting coating. However, at least a large part of the separation region, preferably at least the entire separation region, particularly preferably at least the entire taper, is provided with the hydrogen diffusion-inhibiting coating on the inner side and / or on the outer side.

[0021] Additionally, a magnetic actuator for hydrogen gas applications, particularly for fuel cell and / or electrolyzer applications, is proposed, using the magnetic actuator device. Advantageously, a high degree of tightness can be achieved.

[0022] Furthermore, a method for producing the magnetic actuator device is proposed, wherein the magnetic core and the core tube are manufactured as monolithic components, in particular cut out of a monolithic block, and wherein the magnetic separation of the core tube is realized by a tapering of the wall thickness of a core tube wall of the core tube, forming an unfilled separation region. This advantageously makes it possible to achieve a simple design with particularly high impermeability for hydrogen gas. In addition, a method for producing the magnetic actuator device is proposed, wherein the magnetic core and the core tube are manufactured as monolithic components, in particular cut out of a monolithic block, and wherein the magnetic separation of the monolithic core tube is realized by demagnetizing a material of the core tube wall of the core tube in a separation region of the core tube.This advantageously allows a simple design with particularly high tightness for hydrogen gas and with particularly high core tube stability to be achieved.

[0023] Furthermore, it is proposed that the demagnetization of the core tube wall material be achieved by induction heating of the separation area or by laser annealing of the separation area. This advantageously provides a simple and / or cost-effective and / or rapid manufacturing process.

[0024] The magnetic actuator device according to the invention, the magnetic actuator according to the invention, and / or the methods according to the invention are not intended to be limited to the application and embodiment described above. In particular, the magnetic actuator device according to the invention, the magnetic actuator according to the invention, and / or the methods according to the invention may have a number of individual elements, components, and units that differs from the number stated herein to fulfill a function described herein.

[0025] Drawings

[0026] Further advantages will become apparent from the following description of the drawings. The drawings illustrate an embodiment of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will conveniently consider the features individually and combine them into useful further combinations. They show:

[0027] Fig. 1 is a schematic sectional view of a magnetic actuator with a magnetic actuator device,

[0028] Fig. 2 is an enlargement of the illustration in Fig. 1 in a separation area of ​​the magnetic actuator device,

[0029] Fig. 3 is a schematic flow diagram of a method for manufacturing the magnetic actuator device and

[0030] Fig. 4 shows a separation area of ​​an alternative magnetic actuator device in a sectional view.

[0031] Description of the embodiment

[0032] Fig. 1 shows a schematic sectional view of a magnetic actuator 70. The magnetic actuator 70 is intended for hydrogen gas applications. The magnetic actuator 70 is intended for fuel cell applications and / or for electrolyzer applications. The magnetic actuator 70 has a magnetic actuator device 50. The magnetic actuator device 50 is designed as a hydrogen gas-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 monolithic. The core tube 12 has an axial direction 14. The axial direction 14 runs parallel to an inner opening 72 of the core tube 12. The magnetic core 10 is completely closed on one side in the axial direction 14 of the core tube 12. The core tube 12 is completely closed on one side by the magnetic core 10 in the axial direction 14.In this way, hydrogen gas tightness of the core tube 12, in particular of the inner opening 72 of the core tube 12 to the outside, can be achieved.

[0033] The core tube 12 is designed to be at least substantially magnetically separated along its axial direction 14. The core tube 12 forms a separation region 22. The core tube 12 is magnetically separated in the separation region 22. The core tube 12 has a core tube wall 20. Outside the separation region 22, the core tube wall 20 has an average wall thickness 24 (cf. Fig. 2). The average wall thickness 24 of the core tube wall 20 outside the separation region 22 is more than 0.5 mm. Within the separation region 22, the core tube wall 20 has a tapered wall thickness 18 (cf. Fig. 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 realized 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 of the core tube 12 relative to the average wall thickness 24 outside the separation region 22.The core tube wall 20 is tapered 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 an axial extension 30 of the taper 16 (see Fig. 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 figures, the inner diameter 28 of the core tube 12 is constant. However, it is conceivable that, in addition to or alternatively to the reduction in the outer diameter 26 of the core tube 12, the inner diameter 28 of the core tube 12 is enlarged (not shown). The taper 16 creates a (free) space in the separation region 22. The space created by the taper 16 is designed free of any material filling. The separation region 22, which completely encompasses the taper 16, has a total extension 44 in the axial direction 14 that is less than 15% of a total extension 46 of the magnetic core 10 in the axial direction 14.

[0035] The magnetic actuator 70 has a magnetic coil 54. The magnetic coil 54 can be energized to generate a magnetic field. The magnetic actuator device 50 has a magnetic armature 34. The magnetic armature 34 is partially inserted into the core tube 12. The magnetic armature 34 is movably mounted in the core tube 12. The magnetic armature 34 is movable 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 de-energized. The magnetic actuator device 50 forms a reluctance gap 38. In an energized state, the magnetic armature 34 strives to close the reluctance gap 38 and is thereby pushed toward the magnetic core 10. The magnetic actuator 70 has an actuating element 76.The actuating element 76 serves to transmit the movement of the magnetic armature 34 outward. The total extension 44 of the separation region 22, which completely encompasses the taper 16, in the axial direction 14 is less than 15% of a total extension 48 of the magnetic armature 34 in the axial direction 14. The total extension 44 of the separation region 22, which completely encompasses the taper 16, in the axial direction 14 is less than 15% of a 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] Fig. 2 schematically shows an enlargement of a section of the magnetic actuator device 50 in the separation region 22 with the taper 16. The taper 16 has a magnetic field guiding contour 32 on the magnetic core side. Viewed in the axial direction 14, the magnetic field guiding contour 32 extends entirely within a radial region 36 extending from the axial direction 14, in which radial region 36 the maximum reluctance gap 38 that can be generated between the magnetic core 10 and the magnetic armature 34 during normal operation also lies. The taper 16 has a further magnetic field guiding contour 40 on the core tube side. The magnetic field guiding contour 32 and the further magnetic field guiding contour 40 are designed differently from one another. The further magnetic field guide contour 32 runs, as seen in the axial direction 14, completely outside a radial region 42 extending from the axial direction 14, in which the maximum reluctance gap 38 that can be generated during normal operation is also located.The reluctance gap 38 shown as an example in Figures 1 and 2 represents the maximum possible reluctance gap 38 of the illustrated embodiment. The anti-adhesion element 56 is arranged completely outside the separation region 22 in the axial direction 14. The anti-adhesion element 56 is arranged completely outside a radial region 58 extending from the axial direction 14, the extension 62 of which in the axial direction 14 is delimited by an 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 an inner side 64 of the core tube 12. The hydrogen diffusion-inhibiting coating 68 is applied to a portion of an outer side 66 of the core tube 12. The core tube 12 is provided with the hydrogen diffusion-inhibiting coating 68 on the inner side 64 and on the outer side 66, at least in sections. Alternatively, the hydrogen diffusion-inhibiting coating 68 can also be applied to only one of the two sides 64, 66 of the core tube 12. The hydrogen diffusion-inhibiting coating 68 can be formed as a MAX-phase layer of (oxidized) titanium, aluminum, and nitrogen (Ti2AlN). However, alternative or additional hydrogen diffusion-inhibiting coatings 68 are of course also conceivable.

[0038] Fig. 3 shows a schematic flow diagram of a method for manufacturing the magnetic actuator device 50. In at least one method step 78, the magnetic core 10 and the core tube 12 are manufactured as a monolithic component. In method step 78, the magnetic core 10 and the core tube 12 are cut out of a single monolithic block. The magnetic core 10 and the core tube 12 are manufactured such that the magnetic core 10 completely closes the core tube 12 on one side. In at least one further method step 80, the magnetic separation of the core tube 12 is realized by the taper 16 of the wall thickness 18, 24 of the core tube wall 20 of the core tube 12. The taper 16 forms a separation region 22 that remains unfilled. In method step 80, the taper 16 is produced by screwing a groove on the outer side 66 of the core tube 12 and / or by screwing a groove on the inner side 64 of the core tube 12.In at least one method step 84 that is alternative or additional to method step 80, the magnetic separation of the monolithic core tube 12 is achieved by demagnetizing a material of the core tube wall 20 of the core tube 12 in a separation region 22 of the core tube 12. In method step 84, the demagnetization of the material of the core tube wall 20 is achieved by induction heating of the separation region 22 or by laser annealing of the separation region 22. In at least one method step 82, the 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. In method step 82, the hydrogen diffusion-inhibiting coating 68 is applied at least to the surfaces of the core tube 12 located in the separation region 22. During normal operation of the magnetic actuator 70, the inner opening 72 of the core tube 12 is filled with hydrogen gas.

[0039] Figure 4 shows a further embodiment of the invention. The following descriptions and the drawings are essentially limited to the differences between the embodiments. Regarding components with the same designation, particularly with regard to components with the same reference numerals, reference can also be made to the drawings and / or the description of the other embodiments, particularly Figures 1 to 3.

[0040] Fig. 4 schematically shows an enlargement of a section of an alternative magnetic actuator device 50' in a separation region 22 of a core tube 12. Outside the separation region 22, the alternative magnetic actuator device 50' is essentially constructed in the same way as the magnetic actuator device 50 shown in the preceding figures. The separation region 22 is designed free of any taper. 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 within the separation region 22. The wall thicknesses 18, 24 inside and outside the separation region 22 are at least essentially identical. The magnetic separation of the monolithic core tube 12 is realized by demagnetizing a 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 monolithic core tube wall 20 of the core tube 12 in the separation region 22 of the core tube 12 has a poorly magnetically conductive structure, in particular a metallic structure. The material of the monolithic core tube wall 20 of the core tube 12 in the separation region 22 of the core tube 12 has a martensitic structure. The material of the monolithic core tube wall 20 of the core tube 12 outside the separation region 22 of the core tube 12 has a highly magnetically conductive structure, in particular a metallic structure. The material of the monolithic core tube wall 20 of the core tube 12 outside the separation region 22 of the core tube 12 has a ferritic structure.

[0041] In addition to the taper 16, the magnetic actuator device 50 of Figures 1 to 3 can also have the structural transformation in the separation region 22 described in connection with the alternative magnetic actuator device 50'.

[0042] Reference symbol

[0043] 10 magnetic core

[0044] 12 core tube

[0045] 14 Axial direction

[0046] 16 Rejuvenation

[0047] 18 wall thickness

[0048] 20 core tube wall

[0049] 22 Separation area

[0050] 24 wall thickness

[0051] 26 outer diameter

[0052] 28 inner diameter

[0053] 30 Axial extension

[0054] 32 Magnetic field guide contour

[0055] 34 magnet armature

[0056] 36 Radial area

[0057] 38 Reluctance gap

[0058] 40 Additional magnetic field guide contour

[0059] 42 Radial area

[0060] 44 Total extension

[0061] 46 Total extension

[0062] 48 Total extension

[0063] 50 magnetic actuator device

[0064] 52 Total extension

[0065] 54 Solenoid coil

[0066] 56 Anti-adhesive element

[0067] 58 Radial area

[0068] 60 extension

[0069] 62 Extension

[0070] 64 Inside

[0071] 66 Outside Hydrogen diffusion-inhibiting coating Magnetic actuator Inner opening Return spring Actuating element Process step Process step Process step Process step

Claims

Claims: Magnetic actuator device (50, 50'), in particular a hydrogen gas-tight magnetic actuator device, comprising at least one magnetic core (10) and at least one core tube (12) which is at least substantially magnetically separated along its axial direction (14), characterized in that, to achieve hydrogen gas tightness, the magnetic core (10) is completely closed at least on one side in the axial direction (14) and the core tube (12) is monolithic with the magnetic core (10). Magnetic actuator device (50, 50') according to claim 1, characterized in that the magnetic separation of the monolithic core tube (12) is achieved at least partially by demagnetizing a material of the core tube wall (20) of the core tube (12) in a separation region (22) of the core tube (12), in particular by a thermal microstructure transformation of the material of the core tube wall (20), e.g. by induction or laser annealing. A magnetic actuator device (50, 50') according to claim 1 or 2, characterized in that the material of the monolithic core tube wall (20) of the core tube (12) in the separation region (22) of the core tube (12) has a magnetically poorly conductive structure, in particular a metallic structure, e.g. a martensitic structure, and that the material of the monolithic core tube wall (20) of the core tube (12) outside the separation region (22) of the core tube (12) has a magnetically highly conductive structure, in particular a metallic structure, e.g. a ferritic structure. A magnetic actuator device (50) according to one of the preceding claims, characterized in that the magnetic separation of the core tube (12) is achieved at least partially by a reduction (16) of the wall thickness (18) of a core tube wall (20) of the core tube (12) in a separation region (22) of the core tube (12).Magnetic actuator device (50) according to claim 4, characterized in that the core tube wall (20) is tapered in the separation region (22) to at least one-third of the mean wall thickness (24) of the core tube wall (20) outside the separation region (22). 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. Magnetic actuator device (50) according to any one of claims 4 to 6, characterized in that an outer diameter (26) of the core tube (12) is reduced in the separation region (22) and / or that an inner diameter (28) of the core tube (12) is increased in the separation region (22). A 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 a large part of the total axial extent (30) of the tapering (16). A magnetic actuator device (50) according to any one of claims 4 to 8, characterized in that a space formed by the tapering (16) in the separation region (22), in particular a groove formed by the tapering (16) in the separation region (22), is free of any material filling. A magnetic actuator device (50) according to any one of claims 4 to 9, characterized in that the tapering (16) has a magnetic field guiding contour (32) at least on the magnetic core side.A magnetic actuator device (50) according to claim 10, characterized by a magnetic armature (34), wherein the magnetic field guide contour (32) extends completely within a radial region (36) extending from the axial direction (14), in which a maximum reluctance gap (38) achievable between the magnetic core (10) and the magnetic armature (34) during normal operation is also located. A magnetic actuator device (50) according to any one of claims 4 to 11, characterized in that the tapered section (16) has a further magnetic field guide contour (40) at least on the core tube side. Magnetic actuator device (50) according to claim 12, characterized by a magnetic armature (34), wherein the further magnetic field guide contour (32) in the axial direction (14) extends completely outside a radial area (42) extending from the axial direction (14), in which a maximum reluctance gap (38) that can be generated between the magnetic core (10) and the magnetic armature (34) in normal operation is also located. Magnetic actuator device (50) according to one of claims 4 to 13, characterized in that the separation area (22) completely encompassing the tapering (16) has a total extent (44) in the axial direction (14) which is at most 25%, preferably at most 15%, of a total extent (46) of the magnetic core (10) in the axial direction (14), a total extent (48) of a magnetic armature (34) of the magnetic actuator device (50) in the axial direction (14) and / or a total extent (52) of a magnetic coil (54) of the magnetic actuator device (50) in the axial direction (14).Magnetic actuator device (50) according to one of claims 4 to 14, characterized by a magnetic anti-stick element (56) which is arranged in the axial direction (14) completely outside the separation area (22), in particular completely outside a radial area (58) extending from the axial direction (14), the extent (62) of which in the axial direction (14) is limited by an extent (60) of the taper (16) in the axial direction (14).

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

17. Magnetic actuator (70) for hydrogen gas applications, in particular for fuel cell and / or electrolyzer applications, comprising a magnetic actuator device (50, 50') according to any one of the preceding claims.

18. Method for manufacturing a magnetic actuator device (50), in particular according to any one of claims 1 to 16, comprising a magnetic core (10) and a core tube (12) which is at least substantially magnetically separated from the magnetic core (10), wherein the magnetic core (10) and the core tube (12) are manufactured as monolithic components, in particular by being cut from a monolithic block, and wherein the magnetic separation of the core tube (12) is achieved by a tapering (16) of a wall thickness (18, 24) of a core tube wall (20) of the core tube (12), forming an unfilled separation region (22). A method for manufacturing a magnetic actuator device (50, 50'), particularly according to any one of claims 1 to 16, comprising a magnetic core (10) and a core tube (12) which is at least substantially magnetically separated from the magnetic core (10), wherein the magnetic core (10) and the core tube (12) are manufactured as monolithic components, in particular by being cut from a monolithic block, and wherein the magnetic separation of the monolithic core tube (12) is achieved by demagnetizing a material of the core tube wall (20) of the core tube (12) in a separation region (22) of the core tube (12). A method according to claim 19, characterized in that the demagnetization of the material of the core tube wall (20) is produced by induction heating of the separation region (22) or by laser annealing of the separation region (22).

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