DE102015203733A1 - Valve arrangement and associated valve cartridge and solenoid valve - Google Patents

Abstract

The invention relates to a valve arrangement (10) with a movable plunger, which has a closing element (4.2) with a closing geometry (12), wherein the closing geometry (12) with a seat geometry (14) of a valve seat (8) forms a valve, which forms a Fluid flow between an inlet and at least one outflow adjusts, wherein the closing geometry (12) in the closed valve state sealingly with the seat geometry (14) cooperates, and in the open valve state, a flow area (15) between the closing element (4.2) and the valve seat (8) releases , as well as a corresponding valve cartridge and a corresponding solenoid valve with such a valve arrangement (10). According to the invention, the closing geometry (12) and the seat geometry (14) form a conical nozzle (19.1) with a decreasing passage cross-section (AZ) at an inflow area (15.1) of the flow area (15) facing the inflow and at an outflow area facing the at least one outlet (15.1). 15.2) of the flow area (15) has a diffuser (19.2) with an increasing cross-section (AA).

Description

The invention relates to a valve assembly according to the preamble of independent claim 1, a valve cartridge according to the preamble of independent claim 8 and of a solenoid valve according to the preamble of independent claim 9.

A conventional designed as normally open control valve solenoid valve is used for example as an inlet valve, which controls the pressure build-up in a Radbremszange during control operations in an antilock braking system (ABS) or a traction control system (ASR system) or an electronic stability program system (ESP system). With a fully energized intake valve, a hydraulic connection between a master cylinder and the wheel brake caliper is interrupted. By energizing a closing element or plunger is pressed with a sealing geometry in a corresponding valve seat, so that no fluid can flow through the valve. Since it is the o.g. Inlet valve is an adjustable valve, it can take different valve lifts for different electrical currents. Depending on the valve current and the pressure difference applied to the valve, an equilibrium of forces arises, so that the closing element remains in a defined stroke position and a volume flow corresponding to the boundary condition can flow through the valve. Thus, the volume flow is controlled via the inlet valve, which is placed on the electric current. A stored flow-current map is used to set the brake pressure of the wheel brake in the vehicle downstream of the intake valve. In case of occasional cavitation in the throttle valve geometry in front of the sealing seat, the volume flow can be limited. As a result, the pressure build-up in the wheel brake can be slowed compared to the prediction of the flow-current characteristic map. Thereby, the operating range of the intake valve can be limited to small pressure differences. This restriction can be canceled, for example, via a pulse width modulation operation with short-term full lift of the intake valve, which allows higher pressure differences at the expense of greater noise.

From the DE 10 2009 026 853 A1 For example, a valve cartridge is known, which comprises a sleeve, a valve insert connected to the sleeve, an axially within the sleeve against the force of a return spring between a closed position and an open position guided valve armature which is coupled to a plunger with locking geometry, and one with the Valve insert associated valve body having a valve seat, which is arranged between at least a first fluid port and at least one second fluid port. The closing geometry in the closed position sealingly cooperates with a seat geometry of the valve seat and interrupts fluid flow between the at least one first fluid opening and the at least one second fluid opening. In the open position, the closing geometry is lifted from the valve seat and allows the fluid flow between the at least one first fluid opening and the at least one second fluid opening.

In the published patent application DE 10 2007 051 557 A1 are described a plunger for a solenoid valve and an associated solenoid valve. The described plunger for a solenoid valve comprises a shaft to which a closing element is integrally formed with a sealing element. The sealing element forms with a valve seat a main valve to adjust a fluid flow between an inlet and at least one outlet. The sealing element is embodied, for example, as a spherical cap and the closing element is designed, for example, as a truncated cone whose diameter increases conically starting from the sealing element. On the closing element deflecting means are formed, which in the installed state deflect the fluid flow guided along the wall of the closing element between the inflow and the at least one outflow of the magnetic valve directly in the direction of the at least one outflow. By means of the deflection means arranged on the closing element of the tappet, the fluid flow can advantageously be directed away from the armature space in the direction of outflow. In addition, the deflection means act as a pressure-effective surface and increase the opening force acting on the plunger hydraulic force.

Disclosure of the invention

The valve assembly according to the invention and the valve cartridge according to the invention and the solenoid valve according to the invention with the features of the independent claims have the advantage that the seat geometry of the valve seat and the closing geometry of the closing element in the inflow area are designed as a conical nozzle and in the outflow as a diffuser. This moves the cavitation into the area of the diffuser and has no limiting effect on the volume flow through the open valve.

Advantageously, the flow-flow characteristic map is also unambiguous in cavitating operating points and high pressure differences across the valve can be permitted. Thus, the braking distance of the vehicle is reliable and it can be omitted in an advantageous manner to the noise-intensive use of a pulse width modulation operation.

Embodiments of the present invention provide a valve assembly having a movable plunger having a closure member with a closure geometry, the closure geometry having a seat geometry of a valve seat forming a valve that adjusts fluid flow between an inlet and at least one drain. Here, the closing geometry in the closed valve state sealingly cooperates with the seat geometry, and is in the open valve state, a flow area between the closing element and the valve seat free. According to the invention, the closing geometry and the seat geometry form a conical nozzle with a decreasing passage cross section at an inflow area of the flow area facing the inflow and a diffuser with an increasing cross section at an outflow area of the flow area facing the at least one outlet.

In addition, a valve cartridge with a sleeve, a valve insert which is inserted with one end into the sleeve and at the other end receives a valve body with a valve seat, and a valve arrangement according to the invention with an axially movably guided plunger proposed which a shaft and a closing element with a closing geometry, wherein the closing geometry with a seat geometry of the valve seat forms a valve which adjusts a fluid flow between an inlet and at least one outflow.

Furthermore, a solenoid valve with a magnet assembly, a valve cartridge according to the invention and a valve body is proposed, which is supported axially on the valve cartridge.

The measures and refinements recited in the dependent claims advantageous improvements of the independent claim 1 valve assembly and the specified in the independent claim 9 solenoid valve are possible.

It is particularly advantageous that the seat geometry may have a peripheral sealing edge, which can cooperate sealingly in the closed valve state with the closing geometry. In addition, the seat geometry may have a first gradient in the inflow region and a second gradient in the outflow region, which is smaller than the first gradient.

In an advantageous embodiment of the valve arrangement according to the invention, the seat geometry in the inflow region may have a first angle in the range of 135 to 145 ° to the longitudinal axis of the valve arrangement. Furthermore, the seat geometry in the outflow region may have a second angle in the range from 125 to 130 ° to the longitudinal axis of the valve arrangement. As a result, the outflow region runs flatter than the inflow region.

In a further advantageous embodiment of the valve arrangement according to the invention, the sealing edge can separate the inflow region from the outflow region. This means that at the sealing edge, the effective flow cross sectional area in the flow area is the smallest. Alternatively, a sealing surface may be arranged between the inflow region and the outflow region.

In a further advantageous embodiment of the valve arrangement according to the invention, the closing geometry can be performed as a spherical cap.

In an advantageous embodiment of the solenoid valve according to the invention, depending on a magnetic force generating electric current and a voltage applied between the inflow and the at least one drain differential pressure can set a balance of power, so that the closing element remains in a predetermined stroke position.

An embodiment of the invention is illustrated in the drawings and will be explained in more detail in the following description. In the drawings, like reference numerals designate components that perform the same or analog functions.

Brief description of the drawings

1 shows a schematic sectional view of an embodiment of a valve cartridge according to the invention.

2 shows a schematic detail of an embodiment of a valve arrangement according to the invention of the valve cartridge according to the invention 1 ,

3 and 4 each show a detailed representation of the valve arrangement according to the invention 1 ,

5 and 6 each show a detailed representation of a conventional valve arrangement.

Embodiments of the invention

How out 1 to 4 can be seen, the illustrated embodiment comprises a valve cartridge according to the invention 1 a sleeve 2 , a valve core 6 , which has one end in the sleeve 2 is inserted and at the other end a valve body 7 with a valve seat 8th receives, and a valve assembly 10 with an axial movably guided pestle 4 which is a shaft 4.1 and a closing element 4.2 with a closing geometry 12 having. Here forms the closing geometry 12 with a seat geometry 14 of the valve seat 8th a valve, which is a fluid flow between an inflow 16 and at least one drain 18 established. The closing geometry 12 acts in the closed valve state sealing with the seat geometry 14 together, and there is a flow area in the valve open state 15 between the closing element 4.2 and the valve seat 8th free. According to the invention form the closing geometry 12 and the seat geometry 14 at a tributary 16 facing inflow area 15.1 of the flow area 15 a conical nozzle 19.1 with a decreasing passage cross section A _Z and at one of the at least one drain 18 facing outflow area 15.2 of the flow area 15 a diffuser 19.2 with an increasing passage cross-section A _A from. As a result, advantageously in the flow area 15 resulting cavitation Kv in the area of the diffuser 19.2 shifted and has no limiting effect on the volume flow through the flow area 15 ,

The valve arrangement according to the invention 10 and the valve cartridge according to the invention 1 can be used, for example, in a solenoid valve, not shown, which has a magnetic assembly, not shown. With a corresponding energization, the magnet assembly generates a magnetic force which is the plunger 4 over one in the sleeve 2 arranged anchor 3 moved axially. Depending on a magnetic force generating electric current and a between the inflow 16 and the at least one drain 18 applied differential pressure, adjusts itself to a balance of power, so that the closing element 4.2 remains in a predetermined stroke position and a boundary conditions corresponding fluid flow flows through the valve. To close the valve, the magnet assembly generates a magnetic force which pushes the plunger 4 over the anchor 4 against the force of a return spring 5 moved axially until the closing geometry 12 sealing on the seat geometry 14 is applied. In the illustrated embodiment, the inflow includes 16 a first fluid port configured as an inflow bore in a fluid block 1.1 over which the fluid enters the valve cartridge 1 flows. The drain 18 comprises a plurality of second fluid openings designed as outflow bores 1.2 over which the fluid from the valve cartridge 1 flows.

How out 1 It can also be seen that the outflowing fluid is introduced via an in the region of the second fluid openings 1.2 arranged ring filter 9 guided. In addition, a valve body is supported 20 with one in the valve body 7 pressed in dome 22 and a plastic body 24 axially on the valve cartridge 1 from. The inflowing fluid is via a on the plastic body 24 inserted flat filter 28 filtered. In addition, on the valve body 20 a check valve 26 arranged, whose valve seat in the plastic body 24 is formed and its closing element between plastic body 24 and flat filters 28 is arranged.

How out 3 and 4 is further apparent, is the closing geometry 12 designed as a spherical cap and the seat geometry 14 has a circumferential sealing edge 14.1 on, which in the closed valve state sealing with the closing geometry 12 interacts. In addition, the seat geometry 14 in the inflow area 15.1 a first slope and in the outflow area 15.2 a second slope, which is smaller than the first slope. To realize the first slope, the seat geometry 14 in the inflow area 15.1 a first angle 1 in the range of 135 to 145 ° to the longitudinal axis LA. To realize the second slope, the seat geometry 14 in the outflow area 15.2 a second angle 2 in the range of 125 to 130 ° to the longitudinal axis LA. Here are the two angles 1 . 2 preferably chosen so that there is an angular difference of about 10 °. Therefore, the outflow area runs 15.2 flatter than the inflow area 15.1 , How out 3 and 4 can be seen further separates the sealing edge 14.1 the inflow area 15.1 from the outflow area 15.2 ,

How out 5 and 6 is apparent in a conventional valve arrangement known from the prior art 10A the closing geometry 12A of the closing element 4.2A also executed as a spherical cap. In contrast to the valve arrangement according to the invention 10 is the seat geometry 14A of the conventional valve seat 8A designed so that in the flow area 15A between the inflow area 15.1a and the outflow area 15.2a a throttle 19.3 created with a constant passage cross-section A. To generate the throttle effect, the conventional seat geometry 14A in the inflow area 15.1a of the flow area 15A a first slope with an angle 3 to the longitudinal axis LA, which has a value in the range of 128 to 131 °. This area of seat geometry 14A acts in the closed valve state sealing with the designed as a spherical cap closing geometry 12 together. In the direction of the outflow area 15.2a has the conventional seat geometry 14A in the flow area 15A a second slope at an angle 4 to the longitudinal axis LA in the range of 122 to 125 ° to the longitudinal axis LA, so that there is an angular difference of less than 10 °. This already creates in the inflow area 15.1a one in 6 illustrated Kavitation Kv, which is the volume flow of the fluid in the flow area 15 additionally limited.

At the in 3 and 4 illustrated valve assembly according to the invention 10 is the cavitation Kv by the execution of the inflow area 15.1 as a conical nozzle 19.1 and the outflow area 15.2 as a diffuser 19.2 in the outflow area 15.2 moved, like out 4 is apparent. This will increase the volume flow of the fluid through the flow area 15 not additionally limited. The flow range 15 points in the area of the sealing edge 14.1 the smallest flow area A _D on.

In the illustrated embodiment, the formation of the inflow region 15.1 as a conical nozzle 19.1 and the outflow area 15.2 as a diffuser 19.2 by machining the seat geometry 14 implemented. Alternatively or additionally, for the formation of the inflow region 15.1 as a conical nozzle 19.1 and the outflow area 15.2 as a diffuser 19.2 also the closing geometry 12 of the closing element 4.2 be processed accordingly.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The 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

• DE 102009026853 A1 [0003]
• DE 102007051557 A1 [0004]

Claims (10)

Valve arrangement ( 10 ) with a movable plunger ( 4 ), which has a closing element ( 4.2 ) with a closing geometry ( 12 ), wherein the closing geometry ( 12 ) with a seat geometry ( 14 ) of a valve seat ( 8th ) forms a valve, which is a fluid flow between an inflow ( 16 ) and at least one outflow ( 18 ), wherein the closing geometry ( 12 ) in the closed valve state sealing with the seat geometry ( 14 ) and in the open valve state a flow area ( 15 ) between the closing element ( 4.2 ) and the valve seat ( 8th ), characterized in that the closing geometry ( 12 ) and the seat geometry ( 14 ) at a tributary ( 16 ) facing inflow area ( 15.1 ) of the flow area ( 15 ) a conical nozzle ( 19.1 ) with a decreasing passage cross-section (A _Z ) and at one of the at least one outflow ( 18 ) facing outflow area ( 15.2 ) of the flow area ( 15 ) a diffuser ( 19.2 ) with an increasing cross section (A _A ). Valve arrangement according to claim 1, characterized in that the seat geometry ( 14 ) a circumferential sealing edge ( 14.1 ), which in the closed valve state sealing with the closing geometry ( 12 ) cooperates. Valve arrangement according to claim 1 or 2, characterized in that the seat geometry ( 14 ) in the inflow area ( 15.1 ) a first slope and in the outflow area ( 15.2 ) has a second pitch which is smaller than the first pitch. Valve arrangement according to claim 3, characterized in that the seat geometry ( 14 ) in the inflow area ( 15.1 ) has a first angle (α1) in the range of 135 to 145 ° to the longitudinal axis (LA). Valve arrangement according to claim 3 or 4, characterized in that the seat geometry ( 14 ) in the outflow area ( 15.2 ) has a second angle (α2) in the range of 125 to 130 ° to the longitudinal axis (LA). Valve arrangement according to one of claims 2 to 5, characterized in that the sealing edge ( 14.1 ) the inflow area ( 15.1 ) from the discharge area ( 15.2 ) separates. Valve arrangement according to one of claims 1 to 6, characterized in that the closing geometry ( 12 ) is designed as a spherical cap. Valve cartridge ( 1 ) with a sleeve ( 2 ), a valve core ( 6 ), which with one end in the sleeve ( 2 ) is inserted and at the other end a valve body ( 7 ) with a valve seat ( 8th ), and a valve assembly ( 10 ) with an axially movable plunger ( 4 ), which a shaft ( 4.1 ) and a closing element ( 4.2 ) with a closing geometry ( 12 ), wherein the closing geometry ( 12 ) with a seat geometry ( 14 ) of the valve seat ( 8th ) forms a valve, which is a fluid flow between an inflow ( 16 ) and at least one outflow ( 18 ), characterized in that the valve arrangement ( 10 ) is designed according to one of claims 1 to 7. Solenoid valve with a magnetic assembly, a valve cartridge ( 1 ) and a valve body ( 10 ), which axially on the valve cartridge ( 1 ), characterized in that the valve cartridge ( 1 ) is executed according to claim 8. Solenoid valve according to claim 9, characterized in that in dependence on a magnetic force generating electric current and between the inflow ( 16 ) and the at least one outflow ( 18 ) adjoining differential pressure adjusts a balance of forces, so that the closing element ( 4.2 ) remains in a predetermined stroke position.

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