DE102005043969A1 - Valve device for controlling fluid stream, e.g. volume flow of gaseous fluid, has damping area which is designed between stop surface and area attached to housing for absorbing kinetic energy of valve armature - Google Patents

Abstract

Valve device (1) has the damping area (16) which is designed between the stop surface (15) and the area (11) attached to the housing for absorbing the kinetic energy of the valve armature (8). Valve device has an internal pole element (9, 9a, 9b) which is carried out in two parts.

Description

The The invention relates to a device for controlling a fluid flow, in particular a volume flow of a gaseous fluid according to the preamble of claim 1 closer defined type.

From the DE 103 04 143 A1 For example, a valve device for controlling a fluid is known, which has a valve housing and an electromagnetic actuation unit for actuating a valve anchor. The valve armature is guided axially displaceably in a guide sleeve and provided for controlling a fluid flow between an inflow side and an outflow side. For this purpose, the valve armature is formed with a cooperating with a valve seat valve closure member which is movable for transferring the valve device between a closed and an open state in the guide sleeve axially against a stop member against the force of a return spring.

such Injectors or injection valves, which in gaseous media are used with respect to Their construction and function are substantially different from those for liquid media common Derived injectors, where it is difficult, the special To meet requirements, the gaseous when controlling Volume flows Valves are placed.

a Gas combustion engine or a fuel cell are usually much larger amounts of fluid supply as one with liquid fuel operated internal combustion engine. Why valve devices for controlling of gaseous Fluids with larger cross sections and larger anchor strokes to disposal are to be made.

by virtue of the compared to injectors for liquid media large cross-sections become the operation of valve devices for gaseous Media so-called current-controlled amplifiers used, the Valve devices by the control with current-controlled output stages with very short opening times operate.

This leads however disadvantageously that the valve anchor at such speeds on the one Hubbegrenzungsfläche facing stop element impinges, which disadvantageously to a plastic deformation of Hubbegrenzungsfläche and / or a chipping a wear protection layer or a layer for adjusting a magnetic residual air gap in the area between the valve anchor and the stop element leads. These wear cause during operation of the valve device and lead to an undesirable change the functional values.

Out For this reason, it has been passed on in practice to each other in contact with the end faces the valve anchor and / or the stop element with as a damping element to coat acting elastomers.

Such trained valve devices have due to the material properties the elastomers opposite without elastomer damping elements executed Valve devices Disadvantages in terms of poor adjustability the hardness, the high dispersion between the valves, the small quantity linearity, the temperature behavior and the higher one Demand for magnetic force for actuation the valve device.

Of the The present invention is therefore based on the object, a valve device for controlling a fluid flow, in particular a volume flow a gaseous one Fluids available to provide, which has a long life and with the one exact control feasible is.

Advantages of invention

The inventive device for controlling a fluid flow, in particular a volume flow a gaseous one Fluids, is with a guide element, in which a valve anchor with a valve closing member for adjusting the Fluid flow between an inflow side and a downstream side opposite one Valve seat body guided axially movable is, trained. The valve anchor is by means of a coil and one at least partially disposed within the coil Innenpolelement executed electromagnetic actuator displaceable between two end positions, wherein a first end position the valve anchor by a valve armature associated stop face of Inner pole is defined and the inner pole member for supporting the Valve anchor in its first end position with a fixed to the housing Area cooperating support area formed is.

According to the invention, at least one kinetic energy of the valve armature absorbing damping region is formed between the stop end face and the housing-fixed area. Thus, the valve device is designed in a structurally simple manner with an adjustable braking mechanism for the armature, by means of which wear or plastic deformation both in the region of the valve armature and in the region of the first end position of the valve armature defining stop on the inner pole element are reducible or completely avoidable.

The inventive design the valve device offers in addition to an easily adjustable counterforce for the Valve anchor the possibility of operating noise in the Area of the valve device compared to conventionally trained Significantly reduce valve devices.

In addition will due to the reduced or completely eliminated wear in the area between the facing and in the first end position the valve anchor adjacent end faces of the valve armature and the Innenpolelementes a about the entire life of the valve device consistent functionality of the valve device achieved, which is particularly advantageous for the control of an internal combustion engine is.

One Another advantage resulting from the embodiment of the invention the valve device results is that compared to conventional valve devices achieved a significant reduction in the impact force of the valve anchor becomes. This also leads to reduce the impact load of the other components of the valve device, so that complex measures, which the vibrations caused by the impact of the valve armature on the Innenpolelement reduce in the area of the entire valve device, are not required.

moreover is the valve device according to the invention in comparison to known valve devices with a slimmer magnetic circuit executable, because the valve armature against the fixed stop of the preferably tubular Innenpolelements is cushioned.

Further Advantages and advantageous embodiments of the subject to The invention are the description, the drawings and the claims removed.

drawing

Three embodiments an inventively designed valve device are shown schematically in the drawing and simplified explained in more detail in the following description. Show it:

1 a longitudinal section through a valve device according to the invention;

2 an enlarged detail of the Innenpolelements according to 1 ;

3 a 2 corresponding representation of a second embodiment of the inner pole member; and

4 a 1 corresponding representation of another embodiment of an inventively designed valve device.

description the embodiments

1 shows a partial longitudinal section of a valve device 1 which is designed for use in a fuel cell or in a gas combustion engine of a motor vehicle and for controlling a fluid flow, ie a volume flow of a gaseous fluid, from an inlet side 2 to a downstream side 3 is provided. The valve device according to the invention can be used for example as a low-resistance gas inlet valve in commercial vehicles, such as trucks or buses.

The valve device 1 includes a multi-part housing 4 in which an electromagnetic actuator 5 with a magnetic coil 6 is arranged, which in turn a presently produced by deep drawing or other forming technique guide sleeve or a guide element 7 made of non-magnetic material.

In the guide element 7 is a soft magnetic valve anchor 8th axially displaceably mounted, which is connected to a valve closure member, not shown, which is provided for cooperation with a valve seat.

On the inflow side closes to the valve anchor 8th a coaxial in the guide sleeve 7 arranged, tubular inner pole formed element 9 on which an inner pole of the electromagnetic actuator 5 forms. The inner pole element 9 lies with a valve anchor 8th opposite end face 10 that has a support region of the inner pole element 9 represents, on a an axial fixed stop forming or a housing fixed area performing stop sleeve 11 which is fixed to the guide element 7 connected is.

The valve anchor 8th and the inner pole member 9 each have a central bore, which serves to supply the gaseous fluid to be injected into the combustion chamber of the internal combustion engine and in the one on the valve armature 8th acting, concentric to this return spring 13 is arranged. The return spring 13 is downstream at the in the 1 illustrated embodiment of the valve device 1 at one on the valve anchor 8th trained support shoulder 14 and on the inflow side of an adjusting sleeve 12 supported.

The adjusting sleeve 12 is with her outflow term end in the central bore of the Innenpolelementes 9 arranged and with a first Innenpolelementteil 9A of the two-part inner pole element 9 firmly connected via a press connection. This compound, which can also be designed as a variable threaded connection, serves to determine the axial length of the combination of adjusting sleeve 12 and inner pole element 9 ,

In the non-activated closed state of the valve device 1 the valve seat is sealed by the valve closure member, with the valve anchor 8th firmly connected valve closing member by the force of the return spring 13 is held in the closed position. The adjusting sleeve 12 and the inner pole member 9 Be over the stop sleeve 11 held in a predefined axial position.

To open the valve device 1 becomes the magnetic coil 6 the electromagnetic actuator 5 energized, causing the magnetic valve anchor 8th lifted with the valve closing member of the valve seat and in the direction of the inflow side 2 the valve device 1 is moved. As soon as the valve anchor 8th on the in the valve anchor 8th facing end face 15 a second Innenpolelementteils 9B is hit by the movement of the valve anchor 8th generated momentum in the second Innenpolelementteil 9B initiated.

The second inner pole element part 9B , whose outer diameter D2 is smaller than the outer diameter D1 of the first Innenpolelementteils 9A is, is in the guide element 7 axially displaceably guided and supported by a between the second inner pole element part 9B and the first inner pole member part 9A provided damping range 16 in the axial direction on the stop sleeve 11 from. In addition, the first inner pole member part 9A in the guide sleeve 7 pressed in and thus not designed to be displaceable in the axial direction.

The damping range 16 is at the in 1 illustrated embodiment of the valve device 1 designed as an elastic elastomer ring when opening the valve device 1 by the impact of the valve anchor 8th on the face 15 the second Innenpolelementteils 9B occurring pulse absorbs or attenuates at least to such a proportion that a wear in the region of the inner pole element 9 facing end face of the valve anchor 8th as well as the face 15 of the inner pole element 9 is avoided and a valve noise when opening the valve device 1 is low.

By the arrangement of the damping area 16 between the two inner pole element parts 9A and 9B of the inner pole element 9 is an adjustable deceleration of the valve anchor 8th before, without plastic deformation or wear on the contact surfaces of the valve anchor 8th and the inner pole member 9 occur during a valve opening operation, since the impulse upon impact of the valve armature 8th on the inner pole element 9 at a valve opening to the damping area 16 forwarded and the pulse energy there due to the axial movement of the second Innenpolelementteils 9B and the concomitant deformation of the damping region 16 is reduced.

Depending on the dimensions of the valve device 1 and the desired injection or blow-in dynamics can via a corresponding choice of the elasticity of the damping region 16 the opposing force applied by this are set individually, so that there is a stable damping function and valve function over the entire life of the valve for each valve device.

In addition, it is possible to make the opening process such that the damping provided according to the invention via the damping region 16 no impact on functionality, such as: As the injection or Einblaswinkel and the dynamic volume adjustment, the valve device 1 Has.

Depending on the elastomer hardness or for the production of the damping region 16 selected elastomer type is the caused by the pulse movement of the valve anchor 8th in the direction of the inflow side 2 a certain counterforce of the damping range 16 contrary, due to the valve anchor 8th and the second inner pole member part 9B after reaching the maximum deflection of the valve anchor 8th again in the direction of the outflow area 3 or the valve seat of the valve device to move until a stable equilibrium position is established, in which the elastomeric ring 16 is in a certain state of deformation as a function of the resultant total force component acting on it.

2 shows that in 1 shown in more detail two-part executed inner pole 9 and between the two Innenpolelementteilen 9A and 9B arranged damping area 16 the latter mentioned in the 1 and 2 illustrated first embodiment of the valve device is designed as an elastomeric ring.

In 3 is a second embodiment of an inner pole member 9 an inventively designed valve device 1 shown at the attenuation area 16 is formed as a corrugated metal spring, which is the two Innenpolelementteile 9A and 9B resiliently interconnected.

This means that the metal spring of the in 3 illustrated second embodiment is basically the same functionality as the elastomer ring of in 1 and 2 shown first embodiment of the valve device 1 namely an opening operation of the valve device 1 occurring momentum between the movable in the guide sleeve 7 arranged second inner pole element part 9B and in the guide sleeve 7 pressed first inner pole element part 9A absorb by reversible deformation such that plastic deformation and wear in the region of the mutually facing end faces of the valve armature 8th and the inner pole member 9 be avoided in a simple manner, taking into account the movement of the valve anchor 8th counteracting counterforce of the metal spring 16 of the second embodiment of the valve device 1 by appropriate design of the force of the metal spring, which is variable, for example, by changing the tendency of the spring, in a simple manner to the respective present application is adaptable.

The adjustment of the spring force of the damping region of the inner pole element or the dynamic quantity adjustment of the valve device 1 according to 1 or according to 3 takes place in a simple manner by means of a adapted to the particular application case dynamic and static mass flow adjustment in a conventional manner.

at one not closer shown further advantageous embodiment of the valve device it provided that the damping area of the hollow cylindrical running Inner pole over several the circumference and the axial length the Innenpolelements distributed recesses arranged in the cylinder wall having the inner pole member with the for the damping of the impact of the valve armature on the inner pole element generated pulse or the impact energy forms necessary elasticity and the the Valve function of the valve device impairing wear on simple Fashion avoids.

Of course it lies at the discretion of the skilled person, the attenuation range in other appropriate Fashion way as well as to execute the inner pole element with a plurality of damping regions, which for example, from a combination of different embodiments, d. H. a combination of an elastomeric ring and / or a metal spring and / or recesses in the cylinder wall of the inner pole element are formed.

In 4 is a further embodiment of an inventively designed valve device 1 illustrated in which the inner pole element 9 deviating from the above-described embodiments is made in one piece. The damping range 16 is in the axial extension of the valve device 1 between the face 10 of the inner pole element 9 and one of the inner pole member 9 facing end face of the stop sleeve 11 intended. Basically, the damping range 16 at the in 4 illustrated embodiment, the same functionality as the attenuation ranges of the above examples according to 1 to 3 on, which is why with respect to the functionality of the damping range 16 Reference is made to the above description.

The damping range 16 the valve device 1 according to 3 is in the present case designed as a sleeve-like elastomer ring and can of course also in dependence of the particular application case as an in 3 illustrated metal spring or be designed in any other suitable design.

Claims (6)

Valve device ( 1 ) for controlling a fluid flow, in particular a volume flow of a gaseous fluid, with a guide element ( 7 ), in which a valve anchor ( 8th ) with a valve closing member for adjusting the fluid flow between an inflow side ( 2 ) and a downstream side ( 3 ) relative to a valve seat ( 5 ) is guided axially movable, wherein the valve armature ( 8th ) by means of a magnetic coil ( 6 ) and at least partially within the magnetic coil ( 6 ) arranged inner pole element ( 9 . 9A . 9B ) carried out electromagnetic actuator ( 5 ) is displaceable between two end positions, and wherein a first end position of the valve armature ( 8th ) by a the valve anchor ( 8th ) facing stop face ( 15 ) of the inner pole element ( 9 . 9A . 9B ) and the inner pole element ( 9 . 9A . 9B ) for supporting the valve anchor ( 8th ) in its first end position with a housing-fixed area ( 11 ) cooperating support area ( 10 ) is formed, characterized in that between the stop face ( 15 ) and the housing-fixed area ( 11 ) at least one kinetic energy of the valve armature ( 8th ) absorbing damping area ( 16 ) educated. Valve device according to claim 1, characterized in that the inner pole element ( 9 ) is made in one piece and the damping range ( 16 ) forming damping element between the support area ( 10 ) and the housing-fixed area ( 11 ) is arranged, which is carried out reversibly deformable. Valve device according to claim 1, characterized in that the inner pole element ( 9 . 9A . 9B ) is made in two parts, wherein a first inner pole element part ( 9A ) the support area ( 10 ) having and on the guide element ( 7 ) is supported while the second inner pole element part ( 9B ) relative to the guide element ( 7 ) and the first inner pole element part ( 9A ) is displaceable, and wherein between the first inner pole element part ( 9A ) and the second inner pole element part ( 9B ) the damping range ( 16 ) forming damping element is arranged, which is formed reversibly deformable. Valve device according to claim 3, characterized in that the damping element ( 16 ) is formed of an elastomer. Valve device according to claim 3, characterized in that the damping element ( 16 ) is formed as a metal spring. Valve device according to claim 1, characterized in that that the damping area the hollow cylindrical running Innenpolteils through several over the circumference and the axial length the damping range distributed recesses arranged in the cylinder wall of the Innenpolteils is trained.