阅读说明：本技术 用于调节流体流的阀 (Valve for regulating fluid flow ) 是由 V·埃德曼 A·加特 G·施纳尔泽格 V·舒比肖 C·艾泽勒 于 2018-03-15 设计创作，主要内容包括：本发明涉及一种用于调节流体流的阀(1),其具有阀筒(10),所述阀筒包括至少一个第一流体开口(19.1)、至少一个第二流体开口(19.2)、带有第一阀座(24)和可轴向运动的第一闭锁元件(26)的前置级(20)和带有第二阀座(34)和可轴向运动的第二闭锁元件(36)的主级(30),其中所述第一阀座(24)布置在所述第二闭锁元件(36)的轴向的第一贯通开口(38)处,其中所述第二闭锁元件(36)至少部分地布置在前置级套筒(22)中,其中所述第一阀座(34)布置在所述前置级套筒(22)的内部,其中从至少一个第一流体开口(19.1)到前置级(20)的流动路径引导穿过在所述前置级套筒(22)中的至少一个流入开口(44),所述流入开口径向地嵌入到所述前置级套筒(22),并且其中在操纵元件(16)和所述前置级套筒(22)之间构造有轴向的过滤间隙(42)。在此所述至少一个流入开口(44)和所述轴向的过滤间隙(42)至少部分地重叠并且共同构成流动路径中的过滤器(40)。(The invention relates to a valve (1) for regulating a fluid flow, having a valve cartridge (10) which comprises at least one first fluid opening (19.1), at least one second fluid opening (19.2), a prestage (20) having a first valve seat (24) and an axially movable first blocking element (26), and a main stage (30) having a second valve seat (34) and an axially movable second blocking element (36), wherein the first valve seat (24) is arranged at an axial first through-opening (38) of the second blocking element (36), wherein the second blocking element (36) is arranged at least partially in a prestage sleeve (22), wherein the first valve seat (34) is arranged inside the prestage sleeve (22), wherein a flow path from the at least one first fluid opening (19.1) to the prestage (20) leads through at least one inflow opening (44) in the prestage sleeve (22), the inflow opening is radially inserted into the prestage sleeve (22), and an axial filter gap (42) is formed between the actuating element (16) and the prestage sleeve (22). The at least one inflow opening (44) and the axial filter gap (42) at least partially overlap and together form a filter (40) in the flow path.)

1. A valve (1) for regulating a fluid flow, having a valve cartridge (10) which comprises at least one first fluid opening (19.1), at least one second fluid opening (19.2), a prestage (20) with a first valve seat (24) and an axially movable first blocking element (26), and a main stage (30) with a second valve seat (34) and an axially movable second blocking element (36), wherein the first valve seat (24) is arranged at an axial first through-opening (38) of the second blocking element (36), wherein the second blocking element (36) is arranged at least partially in a prestage sleeve (22), wherein the first valve seat (34) is arranged inside the prestage sleeve (22), wherein a flow path from the at least one first fluid opening (19.1) to the prestage (20) leads through at least one inflow opening (44) in the prestage sleeve (22), the inflow opening is radially inserted into the prestage sleeve (22), and an axial filter gap (42) is formed between the actuating element (16) and the prestage sleeve (22), characterized in that the at least one inflow opening (44) and the axial filter gap (42) at least partially overlap and together form a filter (40) in the flow path.

2. Valve (1) according to claim 1, characterized in that the width of the filter gap (42), the first size and diameter of the at least one inflow opening (44), the second size of the dirt particles (9) to be filtered are preset.

3. Valve (1) according to claim 1 or 2, characterized in that the end region of the axial filter gap (42) overlapping the inflow opening (44) is designed as a delivery ramp (46) which causes a flow deflection.

4. A valve (1) according to any of claims 1 to 3, wherein the prestage sleeve (22) is firmly connected at its open end to a connection region (16.1) of the operating element (16).

5. Valve (1) according to claim 4, characterized in that the connection of the prestage sleeve (22) at the connection region (16.1) of the actuating element (16) is designed as a press connection or as a welded or threaded connection.

6. Valve (1) according to one of claims 1 to 5, characterized in that the axial filter gap (42) is inserted as an axial groove into the connecting region (16.1) of the actuating element (16).

7. Valve (1) according to claim 6, characterized in that a plurality of inflow openings (44) are embedded in the prestage sleeve (22), wherein the filter gaps (42) configured as axial grooves are aligned in each case with one of the inflow openings (44).

8. Valve (1) according to one of claims 1 to 5, characterized in that the axial filter gap (42) is designed as a circumferential step at an end section of the connecting region (16.1) of the actuating element (16).

9. Valve (1) according to one of claims 1 to 8, characterized in that the valve bottom (19) configured as a sleeve is connected fluid-tightly to the valve housing (12).

10. Valve (1) according to claim 9, characterized in that a valve body (32) having an axial second through opening (33) is arranged inside the valve bottom (19) configured as a sleeve, wherein the second valve seat (34) is configured at the axial second through opening (33).

Technical Field

The present invention relates to a valve for regulating a fluid flow according to the subject matter of independent claim 1.

Background

In hydraulic vehicle brake systems, ESP functions (ESP: electronic stability program), ASR functions (ASR: antiskid control device) and/or ABS functions (ABS: anti-lock system) are provided for controlling the driving dynamics, and valves designed as solenoid valves are provided for controlling the fluid flows for the different functions. Such solenoid valves are used as technical components for controlling the inflow or outflow of a fluid or for controlling and/or regulating the flow direction and/or flow rate. In the category of such hydraulic vehicle brake systems, very different systems are known in which an active or partially active pressure increase is achieved in a fluid or hydraulic unit by means of a solenoid valve which is designed as a two-stage high-pressure switching valve and comprises a pilot stage and a main stage. When activated or actuated, the high-pressure switching valve releases a flow path between the master brake cylinder or the primary circuit and the pump element or the secondary circuit, for example. The two-stage configuration also opens the solenoid valve or releases the flow path at high pressure differentials. The primary circuit is coupled to a first fluid opening and the secondary circuit is coupled to a second fluid opening, between which a first blocking element of the upstream stage and a second blocking element of the main stage are arranged. The first fluid opening is usually equipped with a filter, in particular a radial filter, for blocking larger dirt particles that are not able to reach the primary circuit. If the flow path is led from the second fluid connection to the first fluid connection on the basis of the pressure situation, dirt particles accumulate at the filter accordingly. If the pressure conditions change such that the flow path leads from the first fluid connection to the second fluid connection, the dirt particles are detached again and are guided in the direction of the upstream stage. However, since the upstream stage generally has a shorter stroke and smaller flow openings, larger dirt particles can cause jamming or clogging of the upstream stage, which can lead to a malfunction of the valve.

A generic valve for regulating a fluid flow, in particular a hydraulic fluid flow, having a first port opening and a second port opening, a prestage with a first valve seat and a movable first blocking body, and a main stage with a second valve seat and a movable second blocking body is known from document WO 2015/039988 a 1. The second closing body has a through-opening provided with a first valve seat. Provision is made for a filter gap to be formed in the flow path from the first connection opening to the upstream stage by a narrowing of the flow path. The second blocking body is arranged partially, axially movably in the prestage sleeve, wherein the first valve seat is located inside the prestage sleeve. The flow path is directed into the prestage sleeve through at least one radial opening. The hydraulic medium thus passes through the radial openings into the interior of the prestage sleeve, in which the first valve seat and thus the prestage are located. The radial opening can be embodied as a slot, in order to form a filter gap. Dirt particles are thereby prevented from reaching the prestage already at the outside of the prestage sleeve. Furthermore, a plurality of radial openings can be provided, which each form a filter gap. The at least one radial opening can be formed axially at the level of the actuating element which projects into the prestage sleeve and is assigned to the first blocking body, wherein a filter gap is formed by the radial opening or is preferably formed as an axial filter gap between the actuating element and the prestage sleeve. For this purpose, the outer diameter of the actuating element and the inner diameter of the prestage sleeve are selected accordingly in such a way that a filter gap is formed in at least one axial section. The actuating element is a magnetic armature which, when a magnetic coil which is fixed in position of the valve is energized, is moved in particular axially in order to press the first blocking body against the first valve seat or to disengage it therefrom, in particular against a spring force.

Disclosure of Invention

The advantage of a valve for regulating the fluid flow having the features of independent claim 1 is that a defined fluid filtration can be achieved upstream of the upstream stage, which fluid filtration can avoid possible jamming due to foreign matter or dirt particles in the brake fluid and thus an impermissible leakage of the upstream stage of the valve in the entire operating state.

The core of the invention is a filter which is arranged in the flow path of the valve and which is formed by at least one inflow opening and an axial filter gap and filters out impermissibly large dirt particles from the brake fluid. In this way, the upstream-stage seat of the valve can be advantageously protected from impurities or dirt particles from the system and from leaks caused thereby by the structurally simple construction of at least one inflow opening and an axial filter gap between two components in the valve which overlap one another. A further advantage of the invention is that a filter, which is a separate or additional component, and thus the associated costs for handling and assembly, are eliminated in the valve. In contrast to the alternative of filtering the entire volume flow of the valve with an additional filter on the secondary circuit side of the valve, the following advantages are obtained by the embodiment according to the invention: so that particles already present in the valve due to the fitting are not left in the valve but are flushed out of the valve and can be filtered normally at another filter before the assembly. In addition, the primary volume flow is not throttled impermissibly by an additional filter on the secondary circuit side of the valve.

Embodiments of the present invention provide a valve for regulating a fluid flow having a valve cartridge including at least one first fluid opening, at least one second fluid opening, a prestage with a first valve seat and an axially movable first blocking element, and a main stage with a second valve seat and an axially movable second blocking element. The first valve seat is arranged at a first through opening in the axial direction of the second blocking element. The second blocking element is at least partially disposed in a prestage sleeve, wherein the first valve seat is disposed inside the prestage sleeve. A flow path from at least one first fluid opening to a forward stage is directed through at least one inflow opening in the forward stage sleeve, the inflow opening radially embedded in the forward stage sleeve. Furthermore, an axial filter gap is formed between the actuating element and the prestage sleeve. The at least one inflow opening and the axial filter gap at least partially overlap and together form a filter in the flow path.

In an advantageous manner, different sizes for impurities or dirt particles which do not pass through the filter towards the upstream stage can be predetermined by the combination of the at least one inflow opening and the filter gap located directly behind it. These impurities or dirt particles remain in or before the inflow opening and are flushed out again when the valve is actuated next time.

The valve for regulating the fluid flow is preferably designed as a solenoid valve which comprises a magnet assembly, wherein the actuating element is a magnetic armature. By energizing the magnet assembly, a magnetic field can be generated by means of the pole core, which causes the actuating element, which is designed as a magnetic armature, to move.

The measures and refinements embodied in the dependent claims advantageously make it possible to improve the valve for regulating a fluid flow specified in independent claim 1.

It is particularly advantageous if the width of the filter gap, the first size and diameter of the at least one inflow opening, and the second size of the impurities or dirt particles to be filtered can be predetermined. The diameter of the at least one inflow opening defines the maximum value of the length of the foreign or dirt particles, so that very long particles cannot reach the filter gap at all and block it. These long impurities or dirt particles are washed out of the inflow opening again when the valve is actuated next time. The filter gap prevents the passage of impurities or dirt particles which are shorter than the maximum length but wider than the axial filter gap, the width of which is predetermined by the radial distance between the connecting region of the actuating element and the upstream stage sleeve. The size of the impurities or dirt particles to be filtered can thus be predetermined simply by the size of the at least one inflow opening and the filter gap.

In an advantageous embodiment of the valve, the end region of the axial filter gap that overlaps the inflow opening can be designed as a delivery ramp, which causes a flow deflection. As a result of this flow deflection, long impurities or dirt particles cannot "bypass corners" and therefore cannot become stuck at the inflow opening and remain in the filter gap and block it. Furthermore, the chamfer can serve as a lead-in chamfer for the fitting of the prestage sleeve.

In a further advantageous embodiment of the valve, the prestage sleeve can be firmly connected at its open end to a connection region of the actuating element. Due to this firm connection between the actuating element and the prestage sleeve, a precise filter gap is obtained, the width of which can be adjusted simply to the design in the production process. The connection of the prestage sleeve at the connection region of the actuating element can be designed, for example, as a press connection or as a welded or screwed connection.

In a further advantageous embodiment of the valve, the axial filter gap can be inserted as an axial groove into the connecting region of the actuating element. Furthermore, a plurality of inflow openings can be inserted into the prestage sleeve, wherein the filter gaps designed as axial slots can each be aligned with one of the inflow openings in order to form a common filter. Alternatively, the axial filter gap can be designed as a circumferential step on an end section of the connecting region of the actuating element. In this embodiment too, it is possible for a plurality of inflow openings to open into the circumferential step and to each be designed as a common filter with an axial filter gap.

In a further advantageous embodiment of the valve, the valve base, which is designed as a sleeve, can be connected to the valve sleeve in a fluid-tight manner. Furthermore, a valve body having an axial second through-opening can be arranged inside the valve base designed as a sleeve, wherein the second valve seat can be designed at the axial second through-opening.

Drawings

Embodiments of the invention are illustrated in the drawings and are set forth in detail in the description that follows. In the drawings, the same reference numerals denote components or elements having the same or similar functions.

FIG. 1 shows a schematic cross-sectional perspective view of an embodiment of a valve for regulating fluid flow according to the present invention;

Fig. 2 shows a schematic detailed perspective view of the valve for regulating the flow of a fluid according to the invention as shown in fig. 1.

Detailed Description

As can be seen from fig. 1 and 2, according to the exemplary embodiment shown, the valve 1 according to the invention for regulating a fluid flow is provided as a normally closed two-stage solenoid valve with a magnet assembly 3 and an actuating element 16 in the form of a magnetic armature. The magnet assembly 3 comprises a shell-shaped housing sleeve 3.1, a winding support 3.2 and a cover plate 3.4, wherein the winding support is provided with a coil winding 3.3, and the cover plate is arranged on the open side of the housing sleeve 3.1 to close the housing sleeve. The valve 1 can be used, for example, as a high-pressure switching valve in a hydraulic brake system of a vehicle.

As can be further seen from fig. 1 and 2, according to the exemplary embodiment shown, the valve 1 according to the invention for regulating a fluid flow comprises a valve cartridge 10 which encloses a pole core 14, a valve sleeve 12 connected to the pole core 14, an actuating element 16 guided axially movably in the interior of the valve sleeve 12, and a valve base 19 connected to the valve sleeve 12. The valve cartridge 10 further comprises at least one first fluid opening 19.1, at least one second fluid opening 19.2, a prestage 20, which has a first valve seat 24 and a first axially movable blocking element 26, and a main stage 30, which has a second valve seat 34 and a second axially movable blocking element 36.

As can be further seen from fig. 1 and 2, the first valve seat 24 is arranged in an axial first through-opening 38 of the second blocking element 36. Furthermore, the second blocking element 36 is arranged at least partially in the prestage sleeve 22, wherein the first valve seat 34 is arranged inside the prestage sleeve 22. The flow path from the first fluid opening 19.1 leads via at least one inflow opening 44 in the prestage sleeve 22 to the prestage 20, which is introduced radially into the prestage sleeve 22. Furthermore, an axial filter gap 42 is formed between the actuating element 16 and the prestage sleeve 12. In this case, the at least one inflow opening 44 and the axial filter gap 42 at least partially overlap and together form the filter 40 in the flow path. Thus, the width of the filter gap 42 predetermines a first size for the dirt particles 9 to be filtered and the diameter of the at least one inflow opening 44 predetermines a second size for the dirt particles 9 to be filtered.

As can be further seen from fig. 1 and 2, the second blocking element 36 is arranged in the prestage sleeve 22 so as to be axially movable. A pressure spring 28, which in the illustrated embodiment is embodied as a coil spring and presses the second blocking element 36 against the actuating element 16, is arranged between the prestage sleeve 22 and the second blocking element 36, so that the first blocking element 26 can seal the first valve seat 24, which is arranged in the axial first through-opening 38, in the non-actuated state of the valve 1. As can be further seen from fig. 1 and 2, the first latching element 26 is in the illustrated embodiment configured as a latching sphere and is firmly connected to the actuating element 16. The end of the second blocking element 36 opposite the first valve seat 24 protrudes through an opening at the end face of the prestage sleeve 22.

As can be further seen from fig. 1 and 2, the valve base 19 is designed as a sleeve into which an annular valve body 32 is pressed. The valve body 32 has an axial second through-opening 33 which has a larger cross-section than the first through-opening 38 in the second blocking element 36. At this second through-opening 33, a second valve seat 34 is formed inside the valve bottom 19 designed as a sleeve. Alternatively, the second valve seat 34 is formed at a second fluid opening 19.2 which is inserted into the sleeve-shaped valve base 19. By means of the axial movement of the second blocking element 36, the second valve seat 34 and thus the main stage 30 can be opened and closed. The sleeve-like valve bottom 19 can preferably be produced as a deep-drawn part in several stages. The prestage sleeve 22 and the second blocking element 36 project into the valve base 19, so that the second blocking element 36 can interact sealingly with the second valve seat 34. The valve bottom 19 has a second fluid opening 19.2 at its free end. The valve base 19 is arranged here in a fluid block, not shown. As can be further seen from fig. 1 and 2, the first fluid openings 19.1 are embedded as radial bores in the outer surface of the valve base 19. Furthermore, a radial filter 5 is arranged in the region of the first fluid opening 19.1, which can block larger dirt particles. The valve 1 can be blocked by a caulking disc 7 in the fluid block.

As can be further seen from fig. 1 and 2, the prestage sleeve 22 is in the exemplary embodiment shown pressed firmly at its open end against the connecting region 16.1 of the actuating element 16. Alternatively, the connection of the prestage sleeve 22 at the connection region 16.1 of the actuating element 16 can be embodied as a welded or screwed connection. In the exemplary embodiment shown, the axial filter gap 42 is designed as a circumferential step at the end section of the connecting region 16.1 of the actuating element 16. Furthermore, a plurality of inflow openings 44 are inserted as radial bores into the prestage sleeve 22 axially at the level of the connecting region 16.1 and open into the surrounding axial filter gap 42.

In an alternative embodiment, which is not shown, the axial filter gap 42 is inserted as an axial groove into the connecting region 16.1 of the actuating element 16. For a plurality of inflow openings 44 inserted into the prestage sleeve 22, the filter gaps 42 embodied as axial grooves are therefore each aligned with one of the inflow openings 44 in order to form a respective common filter.

As can be further seen from fig. 1 and 2, in the exemplary embodiment shown, the end region of the axial filter gap 42 which overlaps the inflow opening 44 is designed as a conveying ramp 46 which, in the exemplary embodiment shown, causes a flow deflection of approximately 90 °. Furthermore, the delivery ramp 44 serves as a lead-in ramp for the assembly of the prestage sleeve 22.

As can be further seen from fig. 1, the valve cartridge 10 is introduced at least partially into the magnet assembly 3 with the end on the pole core side, wherein the upper end of the magnet assembly 3 rests against the pole core 14 and the lower end of the magnet assembly 3 rests against the valve sleeve 12. The magnet assembly 3 generates a magnetic field by energizing the coil winding 3.3, which causes the actuating element 16, which is designed as a magnetic armature, to move against the force of the return spring 17. The magnetic flux of the generated magnetic field passes through the pole core 14 via the working air gap 18 to the actuating element 16. In the non-energized state shown, an air gap 18 is present between the pole core 14 and the actuating element 16. Furthermore, a return spring 17 is arranged between the pole core 14 and the actuating element 16, which spring presses the first blocking element 26 into the first valve seat 24 by means of the actuating element 16 in the non-energized state. In this case, the actuating element 16 projects with a connecting region 16.1 partially into the prestage sleeve 12, in which the prestage 20 or the first valve seat 24 is arranged. By energizing the coil winding 3.3, a magnetic field is generated by means of the pole core 14, which causes the actuating element 16, which is designed as a magnetic armature, to move against the force of the return spring 17 toward the pole core 14 until the actuating element 16 spans the air gap 18 until it comes to bear against the pole core 14. In the exemplary embodiment shown, the return spring 17 is designed as a helical spring. Damping plates can also be arranged between the pole core 14 and the actuating element 16. The damping disk has the function of slowing down the impact speed of the actuating element 16 against the pole core 14 approximately at the end of the lifting and thus of reducing the switching shock.

The valve 1 can be connected via at least one first fluid opening 19.1 to a primary circuit of the brake system, in which a first pressure P1 is generated, such as, for example, to a master brake cylinder. The valve 1 can be connected via at least one second fluid opening 19.2 to a secondary circuit of the brake system, for example, a pump device, in which a second pressure P2 is generated.

during operation, two flow directions can be achieved with the illustrated valve 1. In the first operating situation (reverse flow), a higher pressure P2 is generated in the secondary circuit connected to the second fluid opening 19.2 than in the primary circuit connected to the first fluid opening 19.1. By energizing the magnet assembly 3, the primary stage 30 is opened and the second blocking element 36 is lifted from the second valve seat 34, so that fluid flows from the second fluid opening 19.2 via the primary stage opening and the radial filter into the primary circuit. The radial filter 5 prevents larger dirt particles from entering the primary circuit to the outside. The dirt particles 9 remain inside the valve at the radial filter 5.

In a second operating situation (normal operation), only the upstream stage 20 of the valve 1 is opened for a defined pressure range generated by the primary circuit (master brake cylinder) and the energized magnet assembly 3. The fluid thus flows from the first fluid opening 19.2 through the prestage 20 towards the second fluid opening 19.1. Dirt particles in the valve 1 at the radial filter 5 are thus entrained from the flow. Depending on the system configuration and valve design, the prestage 20 or the through-opening 38 has a smaller diameter and a shorter stroke in the region of the first valve seat 24. Larger dirt particles 9 can therefore cause jamming of the prestage 20 or blockage of the through-openings 38. This can lead to failure of the valve 1. With the embodiment of the invention, these larger impurities or dirt particles 9 remain outside the prestage sleeve 22 until the inflow opening 44 or before the inflow opening 44, and are flushed out again when the valve 1 is actuated next time. A malfunction of the valve 1 can thereby be avoided in an advantageous manner. Smaller dirt particles, although able to pass through the radial filter 5 and the inflow opening 44 as well as the axial filter gap, are not important for the upstream stage 20 or the valve 1 on the basis of the design with regard to dirt sensitivity.