DE102014207378B4 - Injection valve device for a high pressure system - Google Patents

Abstract

The present invention relates to an injection valve device (100) for a high pressure system, the injection valve device (100) comprising: an injector body (10); a piezoelectric element (20); a membrane (30); and a bottom plate (40) coupled to the piezoelectric element (20), which forms a contact region with the membrane (30) and which has at least one recess (41) which is designed such that particles are conveyed out of the contact region during operation.

Description

The present invention relates to an injection valve device for a high-pressure system.

An injection valve is out of the DE 100 16 247 A1 known.

The fuel injection system described therein is driven by an injector with an electrically controlled actuator. In order to achieve sufficiently fast switching times, the use of piezoelectric actuators has proven to be advantageous.

These drives are flanged either as separate drive units on the injector, or installed in the so-called inline injectors directly in the injector. In both concepts, it is necessary to seal the drive against the accumulating fuel, leakage or high pressure, in order to avoid damage to the piezo stack or its electrically insulating sheath.

Also known is the sealing of the actuator by means of a bellows arranged in the direction of the longitudinal expansion of the actuator. However, this arrangement is space consuming and leads to a reduction in Aktorhubs. Instead bellows therefore increasingly a sealing membrane is used, which is arranged substantially perpendicular to the longitudinal direction of the housing or actuator and laterally mounted in the valve housing.

The DE 10 2005 027 443 A1 describes an actuator which is separated by a membrane from the region of the injection valve in which fuel is located.

The DE 10 2006 014 768 A1 describes a piezoelectric actuator with a stack of a plurality of piezoelectric ceramic layers, wherein between the ceramic layers in each case an electrode layer is provided with an actuated by the piezoelectric actuator actuator and a arranged between the actuator and actuator coupler.

In this case, the piezo is welded into a so-called injector body or drive housing and sealed by a thin metallic membrane which is welded between the housing and the piezo, against the hydraulic system. Since this membrane is moved by the Piezohub and at the same time may exert only very little force on the piezo, the membrane is made thin and flexible.

Since the actuation of the actuator triggers a pressure wave, which also acts on the membrane, it must therefore be supported so as not to be damaged by the induced pressure.

This support takes over the so-called bottom plate, which is firmly connected to the piezo and transmits the stroke and the force to the mechanical-hydraulic system.

This bottom plate is in contact with the membrane. This contact surface changes over the Aktorhub, the membrane rolls off on the bottom plate.

If a particle gets between the two partners, a spike of tension arises in connection with the back pressure, causing the metal diaphragm to fail.

Furthermore, injectors are from the DE 102 60 289 A1 , of the US 4,695,034 and the DE 199 12 665 A1 known.

The object of the present invention is to provide an injection valve device with an improved wear behavior.

The object is solved by the features of the independent claims.

Accordingly, according to a first aspect of the present invention, there is provided an injection valve device for a high pressure system, the injection valve device comprising: an injector body; a piezoelectric element; a membrane; and a base plate coupled to the piezoelectric element, which forms a contact region with the membrane and which has at least one recess which is designed such that particles are conveyed out of the contact region during operation.

According to a second aspect of the present invention, a high pressure system is provided with an injection valve device.

Preferably, such an injection valve device is used in a fluid system for conveying fluid for a storage injection system for internal combustion engines of motor vehicles.

Advantageous embodiments of the invention are characterized in the subclaims.

The present invention is characterized by the fact that it is avoided by the use of the present invention that in the injection valve device, a particle passes between the two components base plate and membrane and wear in the form of a material removal or abrasion from a surface of the bottom plate and / or can cause the membrane.

In this case, the particle may be generated by abrasion of a component of the injection valve device or the particle may occur as a contamination of the ambient air or the particle may occur as an impurity of the fluid with which the fluid system is operated.

In the present invention, the contact surface between the diaphragm and bottom plate of the injection valve device over the total controllable piezohub is configured with recesses or recesses, that during operation of the injection valve device acting on the particles pumping action or pumping force is generated.

The pumping or pumping force may force the particles into that portion of the injector device in which no material abrasion by the particles can be caused.

By introducing relief grooves into the bottom plate, this pumping action can be used to divert the particles into areas where the particles can not cause damage to the injection valve device.

On the one hand, a particle, which is located in a relief groove or in a depression, no longer cause damage, on the other hand, the particle is transported by the rolling of the membrane on the bottom plate to the outside and the particle thus passes out of the contact area between the membrane and the Bottom plate out.

On the one hand, the depressions or relief grooves are designed so that the depressions or relief grooves can take up and discharge particles; on the other hand, the depressions or relief grooves are not formed so large that the stress level of the membrane base plate system is changed due to insufficient support of the membrane.

Although piezo drives are manufactured in clean or clean rooms, in which the concentration of airborne particles is kept as low as necessary, particles or other contamination within the piezo drives can not be completely avoided.

Also in the air particles or other airborne particles are already present, which can have a detrimental effect on the injection valve device during operation. By increasing the efficiency of the ceramic, it is also possible today to achieve deflections which additionally bring the membrane closer to the design limit.

In addition, the piezoceramics must be electrically insulated against ground. For this purpose, silicones are usually used, which emit during operation despite drying and storage still volatile components, as particles.

The present invention advantageously makes it possible to remove these particles into areas where they can not be detrimental to the system bottom plate membrane.

The particles may originate from wear of components of the injection valve device and have a particle size of up to 3 microns or more.

The term fluid is to be understood here in its broader sense, so the fluid can be both a liquid and a gas.

In an advantageous embodiment it is provided that the bottom plate is designed to support the membrane.

As a result, the statics of the injection valve device can advantageously be improved.

In a further preferred embodiment, it is provided that the at least one recess of the bottom plate is designed to generate a pumping force during operation of the injection valve device and to convey the particles out of the contact region with the aid of the pumping force.

This allows a simple way to avoid material removal on the surface of the bottom plate and / or membrane, as caused by particles.

In a further preferred embodiment, it is provided that the at least one recess is formed as a groove-shaped depression or another elongated depression.

As a result, advantageously, a removal of the particles along the groove-shaped depression can be achieved.

In a further preferred embodiment it is provided that the groove-shaped recess or the other elongated recess is formed radially extending on a surface of the bottom plate.

In a further preferred embodiment, it is provided that the groove-shaped recess or the other elongated recess is formed in a hexagonal or semi-tangential manner on a surface of the base plate.

As a result, it is advantageous to avoid particle-induced abrasion by self-induced discharge of the particles during operation.

In a further preferred embodiment it is provided that the groove-shaped depression or the other elongated depression is formed spirally extending on a surface of the bottom plate.

In a further preferred embodiment it is provided that the bottom plate is formed as a rotationally symmetrical body.

The described embodiments and developments can be combined with each other as desired.

Further possible refinements, developments and implementations of the invention also include combinations, not explicitly mentioned, of features of the invention described above or below with regard to the exemplary embodiments.

Brief description of the drawings

The accompanying drawings are intended to provide further understanding of the embodiments of the invention. They illustrate embodiments and, together with the description, serve to explain concepts of the invention.

Other embodiments and many of the stated advantages will become apparent with reference to the drawings. The illustrated elements of the drawings are not necessarily shown to scale to each other.

Show it:

1 a schematic representation of an injection valve device for a high pressure system according to an embodiment of the invention;

2 a schematic representation of an injection valve device for a high pressure system according to another embodiment of the invention;

3 a schematic representation of an injection valve device for a high pressure system according to another embodiment of the invention; and

4 a schematic representation of an injection valve device for a high pressure system according to another embodiment of the invention.

In the figures of the drawings, like reference characters designate like or functionally identical elements, components, components or method steps, unless indicated otherwise.

The 1 shows a schematic representation of an injection valve device for a high pressure system according to an embodiment of the invention.

A floor plate 40 For example, has at least one groove-shaped depression or the other elongated depression 41 on which radially on a surface of the bottom plate 40 runs.

Overall, on the surface of the bottom plate 40 a plurality of depressions 41 arranged, with the wells 41 are arranged rotationally symmetrically.

The groove-shaped or elongated depressions 41 span the area of the contact area between the base plate 40 and membrane 30 ,

The bottom plate 40 can be formed as a rotationally symmetrical body, as in the 1 shown.

The 2 shows a schematic representation of an injection valve device for a high pressure system according to an embodiment of the invention.

Notwithstanding the in the 1 shown bottom plate is in the 2 illustrated base plate 40 with a groove-shaped depression or other oblong depression 41 formed, which sekantial or semi-tangentially extending on a surface of the bottom plate 40 is trained.

Overall, on the surface of the in the 2 illustrated bottom plate 40 a plurality of depressions 41 arranged, with the wells 41 are arranged rotationally symmetrically.

The groove-shaped or elongated depressions 41 span the area of the contact area between the base plate 40 and membrane 30 ,

The others in the 2 Reference numerals shown are already in the to 1 The description of the figures has been explained and will therefore not be further described.

The 3 shows a schematic representation of an injection valve device for a high pressure system according to an embodiment of the invention.

Notwithstanding the in the 1 shown bottom plate is in the 2 illustrated base plate 40 with a groove-shaped depression or other oblong depression 41 spiraling on a surface of the bottom plate 40 educated.

Overall, on the surface of the bottom plate 40 a plurality of depressions 41 arranged, with the wells 41 are arranged rotationally symmetrically.

This results from the depressions 41 on the surface of the bottom plate 40 a paddle wheel pattern formed by the individual spiraling recesses 41 ,

The groove-shaped or elongated depressions 41 span the area of the contact area between the base plate 40 and membrane 30 ,

The 4 shows a schematic representation of an injection valve device for a high pressure system according to an embodiment of the invention.

An injection valve device 100 for a high pressure system for a fluid is in the 4 shown, wherein the injection valve device 100 an injector body 10 , a piezo element 20 , a membrane 30 and one with the piezo element 20 coupled floor plate 40 having.

In this case, the coupling between the piezoelectric element 20 and bottom plate 40 for example, by a planar resting of the piezoelectric element 20 on the bottom plate 40 or by a positive connection of the piezoelectric element 20 and the bottom plate 40 be given.

For example, the bottom plate 40 a contact area with the membrane 30 form and at least one recess 41 have on the surface, which is designed such that in operation particles from the contact area between the bottom plate 40 and membrane 30 be transported out.

In the 4 forms the bottom plate 40 a circular contact area with the membrane 30 from, wherein the circular contact area perpendicular to the dashed line drawn axis of the bottom plate 40 extends and the circular contact area has an inner hole which passes through the bottom plate 40 itself filled out.

The bottom plate 40 is in the 4 shown as a multi-limbed body with several approximately cylindrical sections. These sections are also in the 1 to 3 shown.

The injector body 10 and / or the membrane 30 and / or the bottom plate 40 For example, stainless steel such as molybdenum steel or titanium steel.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto, but modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention.

Claims (9)

Injection valve device ( 100 ) for a high-pressure system, wherein the injection valve device ( 100 ): an injector body ( 10 ); a piezo element ( 20 ); a membrane ( 30 ); and one with the piezo element ( 20 ) coupled floor panel ( 40 ), which has a contact area with the membrane ( 30 ) and which at least one recess ( 41 ), which is designed such that particles are conveyed out of the contact area during operation. Injection valve device ( 100 ) according to claim 1, wherein the bottom plate ( 40 ) is adapted to the membrane ( 30 ). Injection valve device ( 100 ) according to one of claims 1 or 2, wherein the at least one recess ( 41 ) of the bottom plate ( 40 ) is designed to generate a pumping force during operation and to convey the particles out of the contact area with the aid of the pumping force. Injection valve device ( 100 ) according to one of claims 1 to 3, wherein the at least one recess ( 41 ) is formed as a groove-shaped recess or other elongated recess. Injection valve device ( 100 ) according to claim 4, wherein the groove-shaped recess or the other elongated recess ( 41 ) extending radially on a surface of the bottom plate ( 40 ) is trained. Injection valve device ( 100 ) according to claim 4, wherein the groove-shaped recess or the other elongated recess ( 41 ) Seekantial or semi-tangential running on a surface of the bottom plate ( 40 ) is trained. Injection valve device ( 100 ) according to claim 4, wherein the groove-shaped depression or the other elongated depression ( 41 ) spiraling on a surface of the bottom plate ( 40 ) is trained. Injection valve device ( 100 ) according to one of claims 1 to 7, wherein the bottom plate ( 40 ) is formed as a rotationally symmetrical body. High-pressure system with an injection valve device ( 100 ) according to one of claims 1 to 8.

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