Valve

Abstract

The valve is designed for gaseous and liquid media and features a valve body, a magnetic head and an axially displaceable magnetic armature with a sealing diaphragm.

Description

[0001] The invention relates to a valve for gaseous and liquid media having the features of the preamble of claim 1.

[0002] EP 3 608 568 B1 discloses an electromagnetic valve with a sealing membrane that is provided in a plane between a magnetic head and a valve body and co-delimits a valve chamber. The sealing membrane has a sealing body that corresponds to a valve seat and is clipped onto a tapered, mushroom-shaped axle pin of an axially displaceable magnetic armature.

[0003] The object of the invention is to further develop a valve of the type mentioned in such a way that cost-saving production and high valve functional reliability are achieved using simple means.

[0004] This object is achieved according to the invention by the features of claim 1. Expedient embodiments and further developments of the invention are characterized by the features of the subclaims.

[0005] Further advantages and essential details of the invention can be found in the following description and the drawing, which shows a preferred embodiment as an example in a single figure in schematic representation.

[0006] The valve shown is intended for gaseous and liquid media and is designed as an extremely compact micro-diaphragm valve whose outer diameter can preferably be five millimeters. In the specific embodiment shown, the valve is designed as a plug-in valve that can be inserted into a valve receptacle (not shown here). It has a valve body 1, preferably made of plastic, a magnetic head 2, which has a tubular outer core 3, an electric coil 4 and an inner core 5, as well as an axially displaceable magnetic armature 7, preferably loaded with a conical spring 6, to which a sealing diaphragm 8 is assigned, which co-defines a valve chamber 9 and shields the magnetic head 2 from the valve body 1 in a medium-tight manner. The valve body 1, the magnetic head 2 and the magnetic armature 7 are preferably rotationally symmetrical with respect to a longitudinal axis 10 and arranged coaxially to one another.

[0007] The valve body 1 has a base wall 11, which can preferably have an O-ring 12 on its circumference and a further O-ring 13 on the lower end face in the drawing, which can preferably be mounted in rectangular annular grooves and ensure a reliable seal against the escape of the medium when inserted into a valve receptacle. In the center of the base wall 11, an inlet 14 for the medium can expediently be formed, which is designed as a bore and extends coaxially to the longitudinal axis 10. The inlet 14 can advantageously be assigned a filter 15 for the medium, which is expediently also provided coaxially in the base wall 11 in a region between the lower O-ring 13 and the beginning of the inlet bore.

[0008] On the end face of the base wall 11 of the valve body 1 facing away from the O-ring 13, a circular receptacle 16 can advantageously be formed at the bottom of the valve chamber 9, coaxial with the longitudinal axis 10, in which receptacle a perforated stone 17, preferably designed as an artificial sapphire, is mounted in a stationary and medium-tight manner. In an advantageous circular disk-shaped design, the outer peripheral surface of the perforated stone 17 is pressed tightly against the inner peripheral surface of the receptacle 16. The perforated stone 17 can preferably have a narrow bore 18 in the center, the opening of which into the valve chamber 9 can be designed as a valve seat 19. The diameter of the bore 18 can advantageously be less than 1 millimeter and preferably less than 0.4 millimeters.The bore 18 is expediently connected coaxially directly to the inlet 14, so that the medium cleaned by the filter 15 can flow directly into the bore 18 and, when the valve seat 19 is open, into the valve chamber 9 and further into the outlet 41 formed in the valve body 1.

[0009] The preferably round-bolt-shaped magnet armature 7 can advantageously be mounted largely free of play in a central longitudinal bore 20 of the inner core 5. The conical spring 6, which is mounted in a constriction of the magnet armature 7, is supported at the upper end on a shoulder 21 of the inner core 5 and at the lower end on an abutment 22 of the magnet armature 7, thus causing the magnet armature 7 to be pressed toward the valve body 1.

[0010] The sealing membrane 8, preferably made of an elastomer, can advantageously be arranged on the end part of the magnet armature 7 facing the valve body 1. In an advantageous embodiment, the sealing membrane 8 can have a sealing disk 23 with a central sealing body 24, which is expediently mounted in a form-fitting manner with a bottom wall 25 in a recess 26 formed on the end face of the magnet armature 7 facing the valve body 1. The recess 26 can expediently be conically widened towards its base surface, so that an undercut 27 is formed. For this purpose, the bottom wall 25 of the sealing body 24 can be dovetail-shaped in cross-section and arranged with the corresponding conical widening in the undercut 27, so that a form-fitting mounting is provided.On the side facing away from the bottom wall 25, the sealing body 24 can have a preferably frustoconical sealing part which projects into the valve chamber 9 and is pressed with a sealing surface 29 against the valve seat 19 on the upper end face of the perforated brick 17 by means of the force of the conical spring 6 when the magnetic head 2 is switched off, so that the inlet 14 is blocked for the medium.

[0011] The sealing membrane 8 advantageously has an annular wall 30, which is formed integrally on the sealing disc 23 and extends transversely to its plane in the direction of the conical spring 6 and is arranged on the end part of the magnet armature 7 on its circumference. In the plane of the sealing disc 23, a spacer part 31 can preferably be formed integrally on the same material between the circumference of the sealing body 24 and the annular wall 30, so that the annular wall 30 radially surrounds the smaller-diameter base wall 25 at a distance. The diameter of the annular wall 30 can preferably be designed such that it is approximately equal to the diameter of the magnet armature 7 in the region of the magnetic head 2.For a particularly reliable hold of the sealing membrane 8, it may be expedient to form an annular projection 32 on the inside of the annular wall 30, which is molded in one piece from the same material. This projection is preferably rectangular in cross-section and engages in a correspondingly rectangular circumferential groove of the magnet armature 7. The undercut mounting of the bottom wall 25 in the recess 26 and the engagement of the magnet armature 7 by the annular wall 30 ensure a radially and axially positive mounting of the sealing membrane 8 on the end part of the magnet armature 7. For a secure connection, it may also be advantageous to combine the sealing membrane 8 with the magnet armature 7 by means of vulcanization or injection molding. For this purpose, it may be advantageous to provide the surfaces of the magnet armature 7 corresponding to the sealing membrane 8 with an adhesive layer, which promotes the vulcanization or injection molding process and the bonding of the materials.For this purpose, the surfaces to which the sealing body 24, the annular wall 30, the annular projection 32 and the spacer part 31 are vulcanized or injection-molded are preferably provided.

[0012] For positioning between the valve body 1 and the magnetic head 2, the sealing membrane 8 can advantageously have, in the plane of the sealing disk 23, a disc ring 34 which is made of the same material as the sealing disk 23 and which adjoins the annular wall 30 circumferentially, so that the latter is formed between the spacer 31 and the disc ring 34. With regard to cost-effective production and high functional reliability of the valve, it should be emphasized that the sealing membrane 8 is advantageously made of the same material as the sealing disk 23, the sealing body 24, the annular wall 30, the annular projection 32, the spacer 31, and the disc ring 34, and is preferably made of an elastomer.The sealing membrane 8 is expediently positioned in the valve such that the disc ring 34 is clamped in a medium-tight manner between a support surface 35 of the valve body 1 and a pressure surface 36 of an annular collar 37, so that even under high operating stress of the valve, no medium can pass from the valve chamber 9 into the magnetic head 2. The annular collar 37 can advantageously be formed integrally from the same material on an approximately tubular housing part 38, which tightly encloses the lower part of the inner core 5 and the upper part of the valve body 1. In this case, the housing part 38 can be arranged in a stationary manner with an inner circumferential surface on an outer circumferential surface of the inner core 5, preferably by means of a press fit 39, and can firmly engage the upper part of the valve body 1 at a recess with a flange 40, so that the valve body 1 and the magnetic head 2 form a closed structural unit. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 3 608 568 B1

[0002]

Claims

[1] Valve for gaseous and liquid media, with a valve body (1) which has a valve chamber (9), a valve seat (19), an inlet (14) and an outlet (41) for the medium, a magnetic head (2) which has an outer core (3), an electric coil (4) and an inner core (5), and an axially displaceable magnetic armature (7) to which a sealing membrane (8) with a sealing disc (23) and a sealing body (24) for the valve seat (19) is associated, characterized by that the sealing membrane (8) has, transversely to the sealing disc (23), an annular wall (30) which surrounds the sealing body (24) at a distance and which is mounted radially and axially in a form-fitting manner on the circumference of the magnet armature (7). [2] Valve according to the preceding claim, characterized by that the sealing membrane (8) has a spacer part (31) in the plane of the sealing disc (23) between the annular wall (30) and the circumference of the sealing body (24). [3] Valve according to one or more of the preceding claims, characterized by that the annular wall (30) of the sealing membrane (8) is arranged between the spacer part (31) and a disc ring (34) of the sealing disc (23). [4] Valve according to one or more of the preceding claims, characterized by that the annular wall (30) of the sealing membrane (8) and the magnet armature (7) have approximately the same diameter in the area of ​​the magnetic head (2). [5] Valve according to one or more of the preceding claims, characterized by that the annular wall (30) of the sealing membrane (8) has an annular projection (32) which is positively mounted in a circumferential groove of the magnet armature (7). [6] Valve according to one or more of the preceding claims, characterized by that the sealing body (24) of the sealing membrane (8) is positively mounted in a front-side recess (26) of the magnet armature (7). [7] Valve according to one or more of the preceding claims, characterized bythat a bottom wall (25) of the sealing body (24) is mounted in an undercut (27) on the circumference of the recess (26). [8] Valve according to one or more of the preceding claims, characterized by that the sealing membrane (8) is made of one piece with the sealing disc (23), the sealing body (24), the annular wall (30), the annular projection (32), the spacer part (31) and the disc ring (34). [9] Valve according to one or more of the preceding claims, characterized by that the sealing membrane (8) with the sealing disc (23), the sealing body (24), the annular wall (30), the annular projection (32), the spacer part (31) and the disc ring (34) consists of an elastomer. [10] Valve according to one or more of the preceding claims, characterized by that the sealing membrane (8) is vulcanized or injection-molded onto the magnet armature (7). [11] Valve according to one or more of the preceding claims, characterized bythat the sealing body (24), the annular wall (30), the annular projection (32) and the spacer part (31) of the sealing membrane (8) are vulcanized or injection-molded onto the surfaces of the magnet armature (7) corresponding to these parts. [12] Valve according to one or more of the preceding claims, characterized by that the surfaces of the magnet armature (7) corresponding to the sealing membrane (8) have an adhesive layer for the vulcanization of the sealing membrane (8). [13] Valve according to one or more of the preceding claims, characterized by that the disc ring (34) of the sealing membrane (8) is clamped in a medium-tight manner between a pressure surface (36) of a housing part (38) and a bearing surface (35) of the valve body (1). [14] Valve according to one or more of the preceding claims, characterized bythat the valve seat (19) of the valve body (1) is formed on a perforated brick (17) which has a bore (18) for the medium which can be closed and opened via the sealing body (24). [15] Valve according to one or more of the preceding claims, characterized by that the perforated stone (17) is mounted in a receptacle (16) of the valve body (1). [16] Valve according to one or more of the preceding claims, characterized by that the perforated stone (17) is pressed into the receptacle (16) of the valve body (1) in a medium-tight manner. [17] Valve according to one or more of the preceding claims, characterized by that the bore (18) of the hole block (17) corresponds to the inlet (14) of the valve body (1). [18] Valve according to one or more of the preceding claims, characterized by that the bore (18) of the hole stone (17) is smaller than 1 millimeter in diameter, preferably smaller than 0.4 millimeters. [19] Valve according to one or more of the preceding claims, characterized by that a sealing surface (29) of the sealing body (24) of the sealing membrane (8) corresponds to an end face of the perforated brick (17) facing the magnet armature (7). [20] Valve according to one or more of the preceding claims, characterized by that a filter (15) for the medium is arranged upstream of the bore (18) of the perforated brick (17) at the inlet (14) of the valve body (1).

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