Solenoid valve

Abstract

Solenoid valve with a valve housing (2) having an inlet port (3) and an outlet port (4), and with a fluid channel (10) extending through the valve housing (2) between the inlet port (3) and the outlet port (4), and with a valve body (8) linearly movable along an axis of movement (9) in the valve housing (2), which is designed for adjusting a free cross-section of the fluid channel (10), wherein a drive device (15) for introducing drive forces onto the valve body (8) is arranged in the valve housing (2), which comprises an electrical coil arrangement (16) and a permanent magnet arrangement (7), wherein the valve body (8) is provided with the coil arrangement (16) and the permanent magnet arrangement (7) is associated with the valve housing (2), and wherein the permanent magnet arrangement (7) comprises at least two permanent magnets (29, 30, 31) each with axial magnetization.the coils are spaced apart from each other in the axial direction with opposite polarization and wherein the coil arrangement (16) comprises at least two coil sections (17, 18, 19, 20) designed to provide oppositely oriented magnetic fields, wherein the coil sections (17, 18, 19, 20) are wound on a coil former (8) which is at least partially sleeve-shaped and which has several radially projecting, annularly circumferential separating sections (21, 22, 23, 24, 25, 26, 27, 28) serving to guide the coil former (8) in the valve housing (2) and wherein the valve body (8) and the permanent magnet arrangement (7) are designed for mutual sliding bearing.

Description

[0001] The invention relates to a solenoid valve with a valve housing having an inlet port and an outlet port, and with a fluid channel extending through the valve housing between the inlet port and the outlet port, as well as with a valve body linearly movable along an axis of movement within the valve housing, which is designed for adjusting a free cross-section of the fluid channel, wherein a drive device for introducing drive forces onto the valve body is arranged in the valve housing, comprising an electrical coil arrangement and a permanent magnet arrangement, wherein it is provided that the valve body is provided with the coil arrangement and the permanent magnet arrangement is associated with the valve housing, and that the permanent magnet arrangement comprises at least two permanent magnets, each with axial magnetization.which are arranged axially spaced apart from each other with opposite polarization, and that the coil arrangement comprises at least two coil sections arranged axially spaced apart from each other, which are designed to provide oppositely oriented magnetic fields.

[0002] The generic DE 103 60 713 A1 discloses an electromagnetic linear actuator with at least one stator having a magnetic unit for generating a magnetic field in at least one intermediate space and with a rotor having a coil unit, which is movably arranged in the intermediate space along the longitudinal axis of the linear actuator separated from the stator by air gaps, so that a magnetic flux in the air gap runs perpendicular to the direction of movement of the rotor, and which is designed such that the magnetic unit of the stator has permanent magnets that taper conically towards the intermediate space and flux concentrator elements that widen conically towards the intermediate space are arranged adjacent to the permanent magnets in the stator.

[0003] The valve device disclosed in JP 2012-038 813 A comprises first to fourth drive coils and a valve body that is moved by excitation of the first to fourth drive coils. The valve body has a holder and first to third permanent magnets, as well as an elastic element, which are mounted in the holder. At one open end of the holder, a lower curved section is formed, bent inwards at an angle of 90 degrees or more. In this way, one dimension of the holder is set to a predetermined dimension in an axial direction, and the first to third permanent magnets are fixed so that they are not moved within the holder by the elastic restoring force of the elastic element, which is elastically deformed and compressed in the axial direction.

[0004] US Patent 4,649,925 A discloses an ultrasonic transducer probe in which the transducer is vibrated by a crankshaft for sector scanning. The crankshaft is driven by a motor that incorporates a movable magnet stack assembly within a tubular set of electromagnetic coils. The motor also moves a bimetallic pin through a position-sensing coil, so that the transducer's position is represented by the detected change in the coil's inductance.

[0005] From DE 40 12 832 A1, a solenoid valve with at least one solenoid coil is known in which a magnetic armature provided with the valve element is guided axially displaceably. The solenoid coil and the magnetic armature operate as a coreless immersion armature magnetic system, wherein the magnetic armature is at least partially designed as a permanent magnet.

[0006] US Patent 8,415,838 B1 discloses a linear motor comprising an assembly of two or more sets of magnets and pole shoes, the assembly being mounted coaxially inside a housing such that an air gap is formed. The magnets are arranged such that each magnet has opposite magnetization directions relative to its neighboring magnet. The motor embodiment includes a coil carrier with a single electrical coil consisting of two or more sections, each section wound in the opposite direction to the neighboring section and arranged in the corresponding winding areas of the carrier. The coil carrier is movably positioned in the air gap and surrounds the assembly, causing it to move along an axial direction of the motor when current is applied to the coil.

[0007] The object of the invention is to provide a solenoid valve that has a compact design and is designed for fast adjustment processes.

[0008] This problem is solved for a solenoid valve of the type mentioned above with the features of claim 1.

[0009] The design provides that the coil sections are wound on a coil former, which is at least partially sleeve-shaped and has several radially projecting, annularly circumferential separating sections that serve to guide the coil former in the valve housing. The valve body and the permanent magnet assembly are designed for mutual sliding bearing. The coil former primarily serves as a support structure for the coil sections, which are typically wound from thin enameled copper wire and have only low inherent stability. Furthermore, the coil former can be used to ensure reliable spacing of the individual coil sections in the axial direction along the axis of movement. For this purpose, one or more radially projecting separating sections can be provided on the sleeve-shaped coil former.These separating sections have an annular cross-section in a cross-sectional plane oriented perpendicular to the axis of movement. Furthermore, radially outer end faces of the separating sections, which are at least partially annular, can bear against an inner wall of a correspondingly shaped, in particular circular cylindrical, bore in the valve housing to ensure sliding bearing of the coil body in the valve housing.

[0010] Furthermore, it is provided that the valve body and the permanent magnet arrangement are designed for mutual sliding bearing. A cross-section of a recess in the sleeve-shaped valve body and a cross-section of the permanent magnet arrangement are adapted to each other in a plane of motion normal to the axis of movement such that a gap is formed between the two components, enabling a sliding guide of the valve body relative to the permanent magnet arrangement, preferably with low friction.

[0011] For the generation of driving forces between the valve body and the valve housing, it is crucial in this type of drive device, which is based on the utilization of the Lorentz force, that the electrical conductors of the coil assembly are arranged in the magnetic circuit defined by the permanent magnet arrangement such that the current flow is directed perpendicular to the magnetic flux. This ensures that the Lorentz force resulting from the interaction of magnetic flux and current flow is aligned along the axis of motion. This arrangement of the electrical conductors of the coil assembly is particularly ensured if the coil assembly comprises at least two axially spaced coil sections designed to provide oppositely oriented magnetic fields.The coil sections are preferably annular in shape, in particular formed from wires wound around a winding axis. Preferably, the winding axes of the coil sections are aligned at least substantially parallel to the axis of movement.

[0012] The permanent magnet assembly is fixed to the valve housing, while the coil assembly forms part of the valve body, so the drive unit can also be described as a moving-coil drive. One advantage of such a moving-coil drive lies in the low weight of the moving component, in this case the coil assembly, which is part of the valve body, and its low inductance. This allows for high dynamics in the movements of the valve body and thus short response times for the valve assembly. A further advantage of such a drive unit is that the at least two permanent magnets and at least two coil sections each enable a particularly slim design of the permanent magnet assembly, the coil assembly, and therefore the valve assembly.From a magnetic perspective, the permanent magnets and coil sections arranged according to the invention constitute a series connection of several electric moving-coil drives, thereby achieving a favorable ratio between the cross-section of the permanent magnet arrangement and the coil arrangement in a cross-sectional plane perpendicular to the axis of movement and the driving forces applied by the drive unit. It is advantageous that, due to the opposing polarity of the permanent magnets, an effective deflection of the respective field lines and thus an additional concentration of the magnetic fields of the permanent magnets can be achieved. This effect is further enhanced when flux guides are arranged between the permanent magnets. The same applies to the coil sections, which, due to their design to provide opposing magnetic fields, also enable such a concentration of the magnetic fields.

[0013] Advantageous further developments of the invention are the subject of the dependent claims.

[0014] It is advantageous for the coil arrangement to surround the permanent magnet arrangement at radial intervals. This arrangement results in the drive units being designed as a series connection of at least two moving-coil drives. The at least two moving-coil drives can be coordinated either so that, during a short movement of the valve body, the forces applied by the moving-coil drives add up, or so that, during a long movement of the valve body, a complementary force development from the at least two moving-coil drives is ensured, thus guaranteeing an at least substantially constant force acting on the valve body over the entire movement range.

[0015] In a further development of the invention, adjacent coil sections are electrically connected in series and have opposite winding directions. This allows for a particularly simple mechanical and electrical design of the coil arrangement. Due to the series connection and the opposite winding directions of the adjacent coil sections, it is ensured that the desired opposing magnetic fields can be generated when the coil sections are energized with electric current. The coil sections preferably each have the same number of turns and / or the same average winding diameter and / or the same winding density.This is intended to ensure that, in the series connection of the coil sections, oppositely oriented but otherwise identical magnetic fields are formed, particularly with regard to flux density. Alternatively, it can be provided that the coil sections differ in at least one of the properties of number of turns, turn diameter, and turn density, and that the respective coil sections are matched to the geometry of the permanent magnets. In particular, it can be provided that permanent magnets and coil sections in a central area of ​​the drive unit along the axis of motion have a larger extent than permanent magnets and coil sections in peripheral areas of the drive unit adjacent to the central area.

[0016] In a further embodiment of the invention, the permanent magnets are designed as bar magnets, and magnetically conductive flux guides, in particular made of soft magnetic material, are arranged between the permanent magnets. Bar magnets can be used advantageously because the operation of the drive device requires axial magnetization of the permanent magnets, i.e., magnetization parallel to the axis of movement. Preferably, the bar magnets are designed as sections of a round bar, with the axes of symmetry of the individual bar magnets being concentric to each other and aligned parallel to the axis of movement.

[0017] It is advantageous if the valve body is formed integrally with the coil body and / or if a sealing element is arranged on an end face of the valve body, designed to engage with a sealing seat formed in the fluid channel for the temporary blockage of the fluid channel. A one-piece design of the valve body and coil body allows for a cost-effective manufacturing method, such as plastic injection molding. If a sealing element is arranged on the valve body, it can be optionally fixed to the valve body by positive locking or by material bonding, in particular by bonding or injection molding in a two-component plastic injection molding process. The sealing element is designed to form a seal against a sealing seat formed in the fluid channel between the inlet and outlet ports.When the sealing element is in a tight seal at the valve seat, the fluid channel is blocked, preventing fluid from flowing from the inlet to the outlet. When the valve seat is released by a linear movement of the valve body equipped with the sealing element, a free cross-section of the fluid channel can be at least partially or completely opened.

[0018] In a further embodiment of the invention, the coil arrangement is movably mounted between the permanent magnet arrangement and a radially outer return sleeve. The return sleeve, which is preferably made of a soft magnetic material, in particular iron, serves to effectively complement the respective magnetic circuits defined by the coil sections. By way of example, the return sleeve is designed as a sleeve, in particular a circular cylindrical sleeve, which is received, in particular pressed into, a correspondingly designed recess in the valve housing.

[0019] Preferably, a pre-tensioned spring element is arranged between the valve body and the valve housing or between the valve body and the permanent magnet assembly to ensure a preferred position for the valve body. With the aid of this spring element, it can be designed, for example, that the solenoid valve is a normally closed valve that seals the fluid channel between the inlet port and an outlet port without current being energized to the actuator. The spring element is preferably a helical spring, which can be designed, for example, as a discrete spring made of metal or plastic, or as a plastic spring integrally molded onto the valve body.

[0020] In an advantageous embodiment of the invention, the valve body and the permanent magnet assembly define a movement space in which the spring element is arranged and which is provided with a drainage bore that preferably opens into the fluid channel in the region of the sealing seat. This ensures a compact design of the drive unit, since the movement space required anyway for the relative movement between the valve body and the permanent magnet assembly also serves a dual function as a receiving space for the spring element. The drainage bore serves to prevent an undesirable pressure level in the movement space that would impede the movement of the valve body. On the one hand, the drainage bore prevents a fluid cushion from forming in the movement space during relative movement between the valve body and the permanent magnet assembly, which would then need to be compressed or expanded.Furthermore, the drainage bore can serve to maintain pressure conditions at the valve body when the solenoid valve is closed, ensuring that the closed position is maintained without significant closing forces. For example, the drainage bore can be designed to be in communicative communication with the pressurized inlet port of the solenoid valve in such a way that there is no, or at least no relevant, pressure differential between the inlet port and the valve's operating chamber.

[0021] It is advantageous to have a sensor device, particularly one mounted on the valve body, for determining the relative position of the valve body with respect to the valve housing. Using this sensor device, which is in particular a one- or multi-dimensional Hall sensor or another sensor, preferably one that reacts to changing magnetic fields, the relative position of the valve body with respect to the valve housing can be determined. The sensor device is configured for wireless and / or wired signal transmission. In the case of wired signal transmission, the connecting lines can be routed together with the connecting lines for the coil assembly.

[0022] An advantageous embodiment of the invention is shown in the drawing. Here, the drawing shows: Fig. 1 a cross-sectional view of a solenoid valve according to the invention with permanent magnet arrangement and coil arrangement in a closed position, Fig. 2 the solenoid valve according to the Fig. 1, in which the valve body assumes an open position, and Fig. 3 a schematic representation of the magnetic field lines in the drive device.

[0023] The Fig. 1 and Fig. Figures 2 each show a cross-sectional view of a solenoid valve 1 designed to influence a fluid flow and which can be operated with electrical energy.

[0024] The solenoid valve 1 comprises a valve housing 2, on which an inlet port 3 and an outlet port 4 are formed for an inflow and outflow of fluid, respectively. By way of example, the valve housing 2 is designed in multiple parts and comprises an actuator housing 5 and a channel housing 6.

[0025] The drive housing 5 contains a permanent magnet arrangement 7 and a valve body 8, wherein the valve body 8 is mounted so as to be movable along an axis of movement 9 relative to the permanent magnet arrangement 7.

[0026] The inlet port 3 and the outlet port 4 are arranged on the channel housing 6. Furthermore, the channel housing 6 is penetrated by a fluid channel 10, which extends between the inlet port 3 and the outlet port 4. A sealing seat 11 is provided along the fluid channel 10, which can be closed by a sealing element 12 associated with the valve body 8 to prevent fluid flow through the fluid channel 10. To allow fluid flow through the fluid channel 10, the valve body 8 with the sealing element 12 arranged thereon can be lifted from the sealing seat 11 along the axis of movement 9 by means of a drive mechanism 15.

[0027] The drive unit 15 comprises the permanent magnet arrangement 7 and a coil arrangement 16 formed on the valve body 8. By way of example, the coil arrangement 16 comprises several coil sections 17, 18, 19 and 20. It can be provided that the coil sections 17 to 20 are electrically connected in series and that adjacent coil sections 17 to 20 are each formed with opposite winding directions in order to be able to provide opposite magnetic fields when the coil sections 17 to 20 are energized.

[0028] During the Fig. 1 and Fig. In the exemplary embodiment of the drive device 15 shown in Figure 2, the two coil sections 18 and 19, which can also be referred to as central coil sections, are wound in opposite directions but have identical mean winding diameters, identical numbers of turns, and identical winding density. Furthermore, these coil sections 18 and 19 have an extent along the axis of movement that, by way of example, corresponds approximately to twice the extent of the two coil sections 17 and 20, which are also referred to as peripheral coil sections. By way of example, the two coil sections 17 and 20 each have identical mean winding diameters, identical numbers of turns, and identical winding density. The number of turns in the coil sections 17 and 20 can be selected such that it corresponds essentially or exactly to half the number of turns in the coil sections 18 and 19.Furthermore, it can be provided that all coil sections 17 to 20 have the same mean winding diameter and the same winding density. This can result, for example, in the central coil sections 18 and 19 being twice as long in the direction of the axis of movement 9 as the peripheral coil sections 17 and 20.

[0029] The coil sections 17 to 20 are wound on the outer circumference of the sleeve-shaped valve body 8, which thus serves as the coil body. To ensure reliable and durable mechanical separation of the individual coil sections 17 to 20 and to predetermine the position of the individual coil sections 17 to 20 during the winding process, several circumferential, preferably annular, separating sections 21 to 28 are provided on the outer circumference of the valve body 8. These annular sections define the ring-shaped areas into which the respective coil sections 17 to 20 are wound.

[0030] The permanent magnet arrangement 7 comprises several permanent magnets 29, 30, 31 arranged in opposite magnetic directions, each of which is exemplified as a section of a bar magnet magnetized in the axial direction, i.e., parallel to the axis of motion 9. Accordingly, the magnetic north pole of a first permanent magnet 29 to 31 and the north pole of an adjacent second permanent magnet 29 to 31 are opposite each other. This results in an advantageous deflection of the field lines of the permanent magnets 29 and 30 or 30 and 31 adjacent to the respective magnetic gaps 33 and 34, particularly in the magnetic gaps 33 and 34, which at least partially accounts for the advantageously high power density for the drive device 15.Another aspect that enables the high power density of the drive unit 15 lies in the arrangement of flux guide pieces 35 to 38 made of a soft magnetic material on the end faces of the permanent magnets 29 to 31, in particular in the magnet gaps 33 and 34. A third aspect that also contributes to the high power density of the drive unit 15 is the radially external, sleeve-shaped return jacket 39 made of soft magnetic material, which is arranged in the valve housing 2 and is designed for efficient return of the field lines of the coil arrangement 16.

[0031] The dimensions of the permanent magnets 29 to 31 and the coil sections 17 to 20 along the axis of movement 9 are coordinated such that along a movement path for the valve body 8, which is equal to the valve stroke, at least one of the coil sections 17 to 20 always completely covers one of the magnet gaps 33 or 34, in order to always ensure a minimum force from the permanent magnet arrangement 7 to the coil arrangement 16.

[0032] By way of example, the permanent magnet assembly 7, comprising the permanent magnets 29, 30, and 31 and the associated flux guides 35 to 38, is provided with a recess in which a retaining screw 40 is received. The retaining screw 40 is screwed into a cover 42 with a threaded section 41. This cover seals the recess formed in the drive housing 5 for the drive unit 15 and is secured to the drive housing 5, for example, by means of a thread (not shown in detail). At an end region of the retaining screw 40 opposite the threaded section 41, an exemplary cup-shaped receptacle 43 is formed, in which a spring element 44, for example, a helical spring, is supported. Furthermore, the spring element 44 is supported against an inner end face 46 of the valve body 8. The spring element 44 is dimensioned with respect to its extension along the axis of movement 9 such that it is in the Fig. In the closed position of the solenoid valve 1 shown in Figure 1, a pressure preload is present, so that the sealing element 12 is pressed onto the sealing seat and the solenoid valve 1 is a normally closed solenoid valve 1. When current is applied to the coil assembly 16, the interaction of the magnetic forces of the permanent magnet assembly 7 and the coil assembly 16 exerts driving forces along the axis of movement 9 on the valve body 8, which are greater than the restoring forces of the spring means 44, so that the valve body 8 can be moved such that the sealing element 12 is lifted from the sealing seat 11 and thereby at least partially opens the fluid channel 10, as shown in Figure 1. Fig. 2 is shown.

[0033] During the Fig. 1 and Fig. In the embodiment of the solenoid valve 1 shown in Figure 2, which is designed for switching or proportionally adjusting a compressed air flow in the fluid channel 10, the sealing element 12 is attached to an intermediate piece 46, which in turn is mounted on a rod-shaped extension 47 of the valve body 8. The extension 47 is integrally formed with a closing plate 48 that seals the end of the sleeve-shaped valve body 8. Both the sealing element 12 and intermediate piece 46, as well as the extension 47, have a through-bore 49 extending along the axis of movement 9, which provides for fluidic communication between the fluid channel 10 and a movement space 51 defined by the valve body 8 and the permanent magnet assembly 7.This ensures that, in the closed position of the solenoid valve 1, there is no pressure difference between the movement chamber 51 and the section of the fluid channel 10 adjacent to the end face of the sealing element 12. For example, in the closed position of the solenoid valve 1, the movement chamber 51 is in communicative fluidic communication with the inlet port 3, so that the same pressure level is established in the movement chamber 51 as at the inlet port. This means that high closing forces are not required to hold the valve body 8 in the closed position of the solenoid valve 1.

[0034] Furthermore, the through-hole prevents fluid pressure from building up in the otherwise sealed movement chamber 51, which could potentially impede rapid movement of the valve body 8. An additional bore in the valve body 8, also referred to as a breathing bore 54, serves essentially the same purpose.

[0035] Furthermore, it is provided that the intermediate piece 46 is movably sealed with a circumferential seal 52 in an unspecified bore in the valve housing 2, so that a fluid flowing through the fluid channel 10 cannot enter the area of ​​the coil arrangement 16.

[0036] By way of example, it is provided that a position sensor 53, electrically connected to a control device (not shown in detail), is arranged on the valve body 8 in an annular space between two separating sections 24 and 25 in order to determine the position of the valve body 8 along the axis of movement 9. Preferably, this position sensor 53 is a one- or multi-dimensional Hall sensor. This sensor determines the magnetic field strength, in particular the magnetic field emitted by the permanent magnet 30, especially at a time when no or no significant magnetic field emanates from the coil arrangement 16. Alternatively, knowing the current flow through the coil arrangement 16, the influence of the magnetic field of the coil arrangement 16 must be computationally compensated when determining the position of the valve body 8 along the axis of movement 9.

[0037] Guidance of the valve body 8 along the axis of movement 9 is achieved, for example, by providing a circumferential annular collar 57 at a first end region of the valve body 8, which may be interrupted by radially extending slots and which can slide on an inner wall 58 of the valve housing 2. Furthermore, it is provided, for example, that the valve body 8 has a sliding surface 56 at a second end region, which faces away from the first end region, and which is movably received in a guide bore 55 of the valve housing 2.

[0038] In the Fig. Figure 3 schematically illustrates how the magnetic flux emanating from the permanent magnets 29, 30, 31 passes through the flux guides 35, 36, 37, 38, the coil sections 17, 18, 19, 20, and the return sheath 39. Since the permanent magnets 29, 30, 31 are arranged with opposite polarities, the south poles of permanent magnets 29 and 30 and the north poles of permanent magnets 30 and 31 are opposite each other. The coil sections 17, 18, 19 and 20 are arranged and electrically connected in such a way that, when considering adjacent coil sections 17 and 18, 18 and 19, and 19 and 20 respectively, it can be determined that the magnetic fields emitted by the coil sections 17, 18, 19 and 20 when subjected to electrical energy, which are not shown, are oriented in opposite directions to each other.

[0039] Crucial for generating a driving force on the valve body 8 is that the coil sections 17, 18, 19 and 20 are each traversed by an electric current oriented in the opposite direction to that of the adjacent coil section 17, 18, 19 and 20, in order to generate magnetic fields oriented in opposite directions. This is shown schematically in the Fig. 3 is represented by the fact that, for example, in the left-hand part of the coil section 17, the current flows into the plane of representation - circle with dot - and in the right-hand part of the coil section 17, the current flows out of the plane of representation - circle with cross.

[0040] This results, in interaction with the magnetic flux emanating from the permanent magnet 29, directed radially outwards, for example, in a downward direction Lorentz force. The same applies to the coil section 19 and the magnetic fields of the permanent magnets 30 and 31 passing through this coil section 19.

[0041] In contrast, the coil section 18 carries an electric current in the opposite direction, so that the electrical conductors of this coil section 18 interact with the magnetic fields of the two permanent magnets 29 and 30, which are directed radially inwards, and a Lorentz force, directed downwards, is also generated. The same applies to coil section 20 and the magnetic field of permanent magnet 31 passing through this coil section 19.

Claims

[1] Solenoid valve with a valve housing (2) having an inlet port (3) and an outlet port (4), and with a fluid channel (10) extending through the valve housing (2) between the inlet port (3) and the outlet port (4), and with a valve body (8) linearly movable along an axis of movement (9) in the valve housing (2), which is designed for adjusting a free cross-section of the fluid channel (10), wherein a drive device (15) for introducing drive forces onto the valve body (8) is arranged in the valve housing (2), comprising an electrical coil arrangement (16) and a permanent magnet arrangement (7), wherein the valve body (8) is provided with the coil arrangement (16) and the permanent magnet arrangement (7) is associated with the valve housing (2), and wherein the permanent magnet arrangement (7) comprises at least two permanent magnets (29, 30, 31) each with axial magnetization,the coils are spaced apart from each other in the axial direction with opposite polarization and wherein the coil arrangement (16) comprises at least two coil sections (17, 18, 19, 20) designed to provide oppositely oriented magnetic fields, wherein the coil sections (17, 18, 19, 20) are wound on a coil former (8) which is at least partially sleeve-shaped and which has several radially projecting, annularly circumferential separating sections (21, 22, 23, 24, 25, 26, 27, 28) serving to guide the coil former (8) in the valve housing (2) and wherein the valve body (8) and the permanent magnet arrangement (7) are designed for mutual sliding bearing. [2] Solenoid valve according to claim 1, characterized by , that the coil arrangement (16) surrounds the permanent magnet arrangement (7) radially spaced. [3] Solenoid valve according to claim 1 or 2, characterized by, that adjacent coil sections (17, 18, 19, 20) are electrically connected in series and are designed with an opposite winding direction. [4] Solenoid valve according to claim 1, 2 or 3, characterized by , that the permanent magnets (29, 30, 31) are designed as bar magnets and magnetically conductive flux guide pieces (35, 36, 37, 38) made in particular of soft magnetic material are arranged between the permanent magnets (29, 30, 31). [5] Solenoid valve according to any one of the preceding claims, characterized by , that the valve body (8) is formed integrally with the coil body (8) and / or that a sealing element (12) is arranged on an end face of the valve body (8), which is designed to abut a sealing seat (12) formed in the fluid channel (10) for the temporary blocking of the fluid channel (10). [6] Solenoid valve according to any one of the preceding claims, characterized by, that the coil arrangement (16) is mounted in a sliding manner between the permanent magnet arrangement (7) and a radially outer back jacket (39). [7] Solenoid valve according to any one of the preceding claims, characterized by , that a pre-tensioned spring element (44) is arranged between the valve body (8) and the valve housing (2) or between the valve body (8) and the permanent magnet assembly (7) to ensure a preferred position for the valve body (8). [8] Solenoid valve according to claim 7, characterized by , that the valve body (8) and the permanent magnet arrangement (7) define a movement space (51) in which the spring means (44) is arranged and which is provided with a drainage bore (49, 50) which preferably opens into the fluid channel (10) in the area of ​​the sealing seat (12). [9] Solenoid valve according to any one of the preceding claims, characterized by, that a sensor device (53), in particular attached to the valve body (8), is designed to determine a relative position of the valve body (8) relative to the valve housing (2).

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