Check valve for solenoid valve and corresponding solenoid valve

Abstract

To provide a check valve for an electromagnetic valve having a valve component including a movable closing member and a valve seat disposed in a through hole to perform directional conduction and seal functions.SOLUTION: In a check valve, a valve seat has a first area and a second area and the first area of the valve seat forms a support area for a seal member so as to receive support force related to a closing member. The second area of the valve seat forms a seal area so as to enable sealing for the closing member. The invention relates to the check valve and an electromagnetic valve corresponding to the check valve.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The invention relates to a check valve for a solenoid valve having a movable closure member and a valve component with a valve seat arranged in a through hole for performing a directional conducting and sealing function, characterized in that the valve seat has a first area and a second area, the first area of ​​the valve seat constituting a support area for a sealing member to receive a supporting force on the closure member and the second area of ​​the valve seat constituting a sealing area to enable sealing against the closure member, and to a corresponding solenoid valve. [Background technology]

[0002] A conventional solenoid valve, particularly for hydraulic units, for example for application in antilock systems (ABS), anti-slip regulation systems (ASR systems), electronic stability program systems (ESP systems), etc., is shown in Fig. 1. As is clear from Fig. 1, a conventional solenoid valve 1, for example made as a normally open control valve, includes a magnetic module 2 for generating a magnetic flux, including a housing mantle 2.1, a winding support 2.2, a coil winding 2.3, and a cover disk 2.4, and includes a valve cartridge 5 including a capsule 5.1, a valve insert 10 connected to the capsule 5.1 via a seal weld 4, an armature 6 with a plunger 7, and a return spring 8. The magnetic module 2 generates a magnetic force by energizing the coil winding 2.3 via the electrical connection 2.5, which moves the longitudinally movable armature 6 together with the plunger 7 including the closure member 7.1 with the main seal member 7.2 towards the valve insert 10 against the force of the return spring 8. The valve insert 10 guides the magnetic flux introduced from the magnetic module 2 through the cover disc 2.4 axially through the air gap 3 towards the armature 6.

[0003] The valve insert 10 further accommodates a so-called valve body 11, which includes a main valve seat 11.1 into which a main sealing element 7.2, which is made as a sealing ball, sealingly fits in order to realize the sealing function of the solenoid valve 1. A crimping flange 9 is molded into the valve insert 10 for crimping to the fluid block. As is also clear from FIG. 1, the conventional solenoid valve 1 further includes a non-return valve 12, which is arranged eccentrically with respect to the valve axis 1.1 in the bypass to the main valve and which performs a directional conducting and sealing function. This means that the non-return valve 12 is closed by a first fluid flow direction and is opened in the through hole 14.3 by a fluid flow direction opposite to the first fluid flow direction. The non-return valve 12 of the conventional solenoid valve 1 includes as main components a movable closing element 15, a valve seat 14.4 arranged in the valve component 14 and a stroke limiter or abutment, which here is constituted by a flat filter 13, for limiting the maximum stroke of the movable sealing element 15.

[0004] As is evident from the left half of the detailed view in FIG. 2, the check valve 12, which is positioned eccentrically with respect to the valve axis 1.1, usually has a spherical-hollow conical shape, i.e. the closing element 15 is made as a sphere and the valve seat 14.4, which is arranged in the valve component 14, has a hollow conical shape. The valve component 14, which is made as a plastic insert, forms the lower part of the valve and also serves to seal against the surrounding fluid block, to seal against the valve body 10 and to accommodate the annular filter and the flat filter 13. The closing element 15, which is made as a sphere, is entrained by the fluid flow so that a first area 15.1 (sealing area) of the closing element 15 is pressed into the valve seat 14.4, which is made as a hollow cone. As the system pressure increases, for example when the brake pedal is operated or when active pressure generation occurs in an anti-lock system (ABS) or an electronic stability program system (ESP), the closing member 15 is pressed relatively strongly into the valve seat 14.4 and seals therein with the same first area 15.1, becoming increasingly tight as the pressure difference increases. In the opening direction, the fluid flow causes the sealing member 15 to butt against the abutment 13.1, allowing the fluid to flow freely through the through-hole 14.3. Furthermore, the valve component 14 includes a guide area 14.6 that follows closely in space to the valve seat 14.4. This guide area 14.6 limits the movement possibility of the closing member 15 in the open state and thereby defines a guide for the closing member 15.

[0005] Further known from the prior art is, for example, DE 10 200 03 133 A1, which describes a possible preferred embodiment of a check valve of this type with a circumferential sealing lip.

[0006] Furthermore, the prior art discloses patent document 2. This document is directed to a check valve for a solenoid valve having a check valve seat arranged at the edge of a fluid passage and a movable closing member for performing a directional conducting and sealing function, the closing member having a sealing cone, an abutment leg and an elastic sealing ring arranged between the abutment leg and the sealing cone, the abutment leg forming an abutment surface for the elastic sealing ring in the case of sealing, as well as to a solenoid valve having such a check valve. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] DE 102007042717 [Patent Document 1] DE 102016212562 Summary of the Invention

[0008] In contrast, the non-return valve according to the invention advantageously allows for an optimized functionality, in particular an improved sealing and stability. This is made possible according to the invention by the features of the independent claims. Further embodiments of the invention are the subject of the dependent claims.

[0009] The check valve according to the invention for a solenoid valve having a movable closure member and a valve component with a valve seat arranged in a through hole for performing a directional conducting and sealing function is characterized in that the valve seat has a first area and a second area, the first area of ​​the valve seat constituting a support area for the sealing member in order to receive supporting forces on the closure member and the second area of ​​the valve seat constituting a sealing area in order to enable sealing against the closure member.

[0010] This is understood to mean that the valve seat comprises at least two functional elements. For these functions to be fulfilled, the valve seat is configured with correspondingly separate elements for their implementation. Advantageously, an optimization of the function is achieved as a result. The configuration of the first region on the valve seat, i.e. the configuration of the first functional element, allows for extensive protection against plastic deformation of the valve seat in the event of high pressure differences. The configuration of the second region on the valve seat, i.e. the configuration of the second functional element, allows for a significant improvement of the sealing function, especially in the low-pressure region at low pressures. Furthermore, due to the configuration of the second elastically sealing region of the valve seat, it is possible, for example, to correct non-roundness of the valve seat.

[0011] Furthermore, the two functional elements are arranged in different regions of the valve seat, i.e. are spatially separated from one another, so that the arrangement of the respective regions makes it possible to optimally realize the respectively desired functionality.

[0012] What is understood as the valve seat of a check valve is the area that directly follows the through-bore. The valve seat is therefore the area which, together with the closing element, enables the closing of the check valve. From a structural point of view, the valve seat is then a substantially uniformly constructed area, for example a funnel (i.e. a hollow cylindrical taper / expansion). As shown in FIG. 2, the valve component can include a guide area. If such a guide area is constructed, the valve seat is the area constructed between the through-bore and the guide area.

[0013] A first area of ​​the valve seat enabling support for the closure member is preferably configured to orbit about the valve seat, and a second area of ​​the valve seat enabling sealing with the closure member is preferably configured to orbit about the valve seat.

[0014] The first region is configured, for example, in the shape of a hollow cone. Alternatively, the first region can be configured as a segment of a hollow cone. This region is preferably configured as a surface. The second region is configured, for example, in the shape of a hollow cone. This region is preferably configured as a surface.

[0015] In a preferred embodiment, the check valve is characterized in that a first area and a second area of ​​the valve seat interact with the closure member when the check valve is in the closed position.

[0016] This is understood to mean that when the check valve is closed, not only a first area of ​​the valve seat is in contact with the closure member, but also a second area of ​​the valve seat is in contact with the closure member, i.e. there are two direct areas of contact between the valve component and the closure member.

[0017] In one possible embodiment, the check valve is characterized in that the valve seat is made as a hollow cone, the first area of ​​the valve seat as well as the second area being arranged inside the hollow cone.

[0018] This is understood to mean that the valve seat is configured essentially as a hollow cone, with both the support area and the sealing area being configured inside this hollow cone.

[0019] In a preferred embodiment, the check valve is characterized in that the first region of the valve seat is configured spatially distal to the second region of the valve seat in a direction in which the hollow-conical seat tapers.

[0020] This is understood to mean that both the support area and the sealing area are arranged inside the hollow-conical valve seat, with the first area (i.e. the support area) being located spatially further forward in the direction of the tapering of the hollow-conical valve seat compared to the second area (i.e. the sealing area), and the second area being accordingly located spatially further forward in the direction of the opening area of ​​the hollow-conical valve seat compared to the first area.

[0021] In an alternative development, the check valve is characterized in that the first area of ​​the valve seat is configured integrally with the valve component.

[0022] This is understood to mean that the support area is produced as an integral element of the valve component directly during production of the valve component, in particular the valve component and the integrated support area are produced by an injection molding process.

[0023] In a preferred embodiment, the check valve is characterized in that the second area of ​​the valve seat is configured integrally with the valve component.

[0024] This is understood to mean that the sealing area is produced as an integral element of the valve component directly during production of the valve component. In particular, the valve component and the integrated sealing area are produced by an injection molding process. Furthermore, this is understood to mean that both the first area and the second area of ​​the valve seat are integrally configured with the valve component. In particular, the first area of ​​the valve seat as a support area and the second area of ​​the valve seat as a sealing area are integrated into the valve component.

[0025] In a possible embodiment, the check valve is characterized in that the first and second areas of the valve seat are constructed by an injection molding process as part of the valve component.

[0026] In a preferred development, the check valve is characterized in that the second region of the valve seat is configured as a sealing lip, in particular as an elastic, circumferential sealing lip, against which the closure member sealingly abuts to perform the sealing function.

[0027] This is understood to mean that the closing element is pressed against an elastic second area of ​​the valve seat for the performance of the sealing function. The pressing can be effected, for example, by means of fluid pressure. Due to the pressing force, an elastic deformation of the second area of ​​the valve seat can occur. It should be noted here that the bearing force of the closing element is carried out by the first area of ​​the valve seat, against which the closing element is also pressed, but essentially without the first area undergoing an elastic deformation.

[0028] In an alternative embodiment, the check valve is characterized in that an undercut is cut into the second region of the valve seat to form a sealing lip, which undercut defines a wall thickness acting as the sealing lip relative to the through hole.

[0029] In this way, the sealing lip can be realized simply and at low cost by a slight design change of the valve seat. By providing an undercut to the valve seat of the check valve, the thinned wall portion manufactured as the sealing lip flexes when pressure is applied and fits tightly to the seal member. The undercut is manufactured, for example, as a circumferential annular groove. Furthermore, the elasticity of the circumferential sealing lip can be determined by the depth of the undercut and / or the positioning of the undercut on the valve seat.

[0030] In a preferred development, the check valve is characterized in that the closure element does not comprise an elastic sealing element, but is in particular configured as a sealing ball.

[0031] This is understood to mean that the closure element corresponds to a simple and therefore cost-effective embodiment. For example, the closure element has a spherical shape. In particular, the closure element is configured as a sphere. The closure element is preferably configured as a steel sphere. Furthermore, the closure element does not have an elastic sealing element, either integrally or separately, for example by a sealing ring or the like.

[0032] In a possible embodiment, the check valve is characterized in that the closure member is supported with a first area on the valve seat to perform the sealing function and is sealed with a second area on the valve seat, in particular in that the closure member abuts against an abutment portion to release the valve seat to perform the conducting function, the abutment portion being arranged opposite the valve seat.

[0033] This is understood to mean that a check valve performs both functions: a sealing function and a conducting function. As already suggested, the closure member abuts and is supported on a first area of ​​the valve seat with a first area of ​​the closure member to enable the sealing function. Furthermore, the closure member abuts and thereby seals on a second area of ​​the valve seat with a second area of ​​the closure member to enable the sealing function. To enable the conducting operation, the closure member is moved away from this position and abuts an abutment area positioned on the opposite side.

[0034] Further, a solenoid valve is provided having a magnetic module and a valve cartridge including an armature movably guided inside the capsule, a valve insert, a plunger movably guided inside the valve insert, a closure member with a main sealing member, and a valve body including a main valve seat, and a main valve including a main sealing member coupled with the closure member and a main valve seat arranged in the valve body is arranged between the fluid inlet and the fluid outlet, and the magnetic force generated by the magnetic module moves the armature and the plunger, and the main sealing member enters the main valve seat to seal and perform a sealing function. According to the present invention, the solenoid valve is characterized in that it has a check valve as described above, which is arranged in a bypass to the main valve to perform a directional conduction and sealing function.

[0035] It should be pointed out that the features described individually in this specification can be combined with one another in any technically meaningful manner to provide new embodiments of the invention. Further features and suitability of the invention will become apparent from the description of the embodiments with reference to the attached drawings. [Brief description of the drawings]

[0036] [Figure 1] FIG. 2 is a schematic cross-sectional view showing a solenoid valve having a check valve. [Diagram 2] 1 is a detailed view showing a check valve according to the prior art (left half) and an embodiment of the present invention (right half). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] 2 shows in the right half a detailed view of a check valve according to an embodiment of the invention. The valve seat 14.4 is substantially hollow-cone shaped. This hollow-cone area comprises a first area 14.1 and a second area 14.2.

[0038] The first area 14.1 of the valve seat 14.4 forms a support area in which the closure body 15 is supported with the first area 15.1, and the second area 14.2 of the valve seat 14.4 forms a sealing area in which the closure body 15 is sealed with the second area 15.2.

[0039] The first region 14.1 is located spatially further forward than the second region 14.2 in the direction of the taper of the hollow-conical valve seat 14.4. The first region 14.1 forms a circumferential abutment surface. At this point, the support forces associated with the closing body 15 can be taken up by the valve seat 14.4 and transferred to the valve component 14. Plastic deformation of the valve seat is thereby prevented, particularly in the case of high pressure differences.

[0040] The second region 14.1 is located spatially further ahead in the direction of the opening region of the hollow-conical valve seat 14.4 compared to the first region 14.1.

[0041] The second region 14.2 then forms a sealing surface, which is configured as a circumferential sealing lip. To configure the sealing lip, an undercut 14.5 is cut into the valve seat 14.4. The undercut 14.5 determines the wall thickness that serves as the sealing lip. The undercut 14.5 is produced here as a circumferential annular groove, for example. The sealing lip can then be produced directly in an injection molding process. Alternatively, the undercut 14.5 can also be produced subsequently, for example by a cutting process. The elasticity of the sealing lip can be defined by the depth of the undercut 14.5 and / or by the positioning of the undercut 14.5 on the valve seat 14.4. The sealing lip can thus embody a sealing property by elastic deformation. Furthermore, due to the increased flexibility, for example due to the dimensions of the sealing lip, non-roundness of the valve seat 14.4 can be compensated for. [Explanation of symbols]

[0042] 2 Magnetic Module 5 Valve Cartridge 5.1 Capsules 6 Armature 7 Plunger 7.1 Closing members 7.2 Main seal member 10 Valve Insert 11 Valve body 11.1 Main valve seat 12 Check valve 13.1 Contact part 14 Valve Components 14.1 The first area 14.2 The Second Region 14.3 Through holes 14.4 Valve seats 14.5 Undercut 15 Closing member 15.1 The first area 15.2 The Second Region

Claims

1. A check valve (12) for a solenoid valve, comprising a valve component (14) with a movable closing member (15) and a valve seat (14.4) arranged in a through hole (14.3) for performing a directional conducting and sealing function, the valve seat (14.4) has a first area (14.1) and a second area (14.2), the first area (14.1) of the valve seat (14.4) constituting a support area for the closure member (15) for receiving supporting forces associated with the closure member (15); the second area (14.2) of the valve seat (14.4) constitutes a sealing area to enable sealing against the closure member (15); the first area (14.1) and the second area (14.2) of the valve seat (14.4) are formed as part of the valve component (14) by injection molding, the second area (14.2) of the valve seat (14.4) is configured as an elastic circumferential sealing lip against which the closure member (15) sealingly abuts in order to perform a sealing function; an undercut (14.5) is cut into the second region (14.2) of the valve seat (14.4) to define the sealing lip, said undercut defining a wall thickness acting as a sealing lip relative to the through hole (14.3); The undercut (14.5) reaches the height of one of the ends of the first region (14.1), and the undercut (14.5) does not reach the height of the other end of the first region (14.1), 10. A check valve according to claim 9, wherein the second region (14.2) has a sealing surface which continues as a hollow cone from the first region (14.1).

2. 2. The check valve (12) according to claim 1, characterized in that the first area (14.1) and the second area (14.2) of the valve seat (14.4) interact with the closure member (15) when the check valve is in a closed state.

3. 3. The check valve (12) according to claim 1 or 2, characterized in that the valve seat (14.4) is manufactured as a hollow cone, and the first area (14.1) as well as the second area (14.2) of the valve seat (14.4) are arranged inside the hollow cone.

4. 4. The check valve (12) according to claim 3, characterized in that the first region (14.1) of the valve seat (14.4) is configured spatially ahead of the second region (14.2) of the valve seat (14.4) in a direction in which the hollow-conical valve seat (14.4) tapers.

5. 5. The check valve (12) according to any one of the preceding claims, characterized in that the first area (14.1) of the valve seat (14.4) is constructed integrally with the valve component (14).

6. 6. The check valve (12) according to any one of the preceding claims, characterized in that the second area (14.2) of the valve seat (14.4) is constructed integrally with the valve component (14).

7. 7. The non-return valve (12) according to any one of claims 1 to 6, characterized in that the closure member (15) does not include an elastic sealing member but is configured as a sealing ball.

8. the closure member (15) is supported by a first area (15.1) on the first area (14.1) of the valve seat (14.4) to perform a sealing function and is sealed by a second area (15.2) on the second area (14.2) of the valve seat (14.4); 8. The check valve (12) according to claim 1, wherein the closing member (15) abuts against an abutment portion (13.1) to release the valve seat (14.4) in order to perform a conducting function, the abutment portion (13.1) being arranged opposite the valve seat (14.4).

9. A solenoid valve having a magnetic module (2) and a valve cartridge (5) including an armature (6) movably guided inside a capsule (5.1), a valve insert (10), a plunger (7) movably guided inside said valve insert (10) having a closure member (7.1) with a main sealing member (7.2), and a valve body (11) including a main valve seat (11.1), wherein the main sealing member (7.2) and the valve body (11) are connected to the closure member (7.1) between a fluid inlet and a fluid outlet.

9. A solenoid valve comprising: a main valve including a main valve seat (11.1) arranged in a direction parallel to the axis of the solenoid valve; a magnetic force generated by the magnetic module (2) moves the armature (6) and the plunger (7); and the main sealing member (7.2) enters into the main valve seat (11.1) in a sealing manner to perform a sealing function. Such a solenoid valve comprises a check valve (12) according to any one of claims 1 to 8, the check valve (12) being arranged in a bypass to the main valve to perform a directional conducting and sealing function.

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