EP2310147B1 - Device and method for prodcing a pulsed jet of a liquid fluid - Google Patents

Abstract

In order to provide a device for generating a pulsed jet of a liquid fluid comprising a fluid inlet, a fluid outlet and a blocking element arranged between the fluid inlet and the fluid outlet, which cyclically closes and opens a fluid passage between the fluid inlet and the fluid outlet, which device enables an improved mechanical action on an object subjected to the pulsed jet, it is proposed that the device comprises at least one bypass, through which a liquid fluid can also be fed to the fluid outlet during a closing phase of the blocking element.

Description

The present invention relates to an apparatus for generating a pulsed jet of liquid fluid comprising a fluid inlet, a fluid outlet, and a barrier member disposed between the fluid inlet and the fluid outlet that cyclically closes and releases a fluid passageway between the fluid inlet and the fluid outlet.

Such a device is for example from the WO 03/036144 A1 known.

In the known device, a jet flowing out of the fluid outlet is cyclically completely interrupted.

The GB 2 112 303 A discloses a device according to the preamble of claim 1.

The present invention has for its object to provide an apparatus for generating a pulsed jet of liquid fluid, which allows an improved mechanical action on an impinged with the pulsed beam object.

This object is achieved in that the device comprises at least one bypass, through which a fluid fluid can be supplied to the fluid outlet during a closing phase of the blocking element.

The fact that even during a closing phase of the blocking element the fluid outlet and thus the object to be irradiated, a liquid fluid can be supplied, the mechanical effect of the pulsed beam is improved. In a preferred embodiment of the invention it is provided that the device comprises an adjusting device for adjusting a volume flow of a bypass fluid flow flowing through the bypass.

It is advantageous if the device comprises a control device for controlling the volume flow of the bypass fluid flow flowing through the bypass.

It is particularly advantageous if the device comprises a regulating device for regulating the volume flow of the bypass fluid flow flowing through the bypass.

Alternatively or additionally, it can be provided that the device comprises an adjusting device, a control device and / or a regulating device for setting, controlling or regulating a pressure of the bypass fluid flow flowing through the bypass.

It is favorable if the device comprises an adjusting device for adjusting a volume flow of a pulse fluid flow flowing through the fluid passage.

It is particularly favorable if the device comprises a control device for controlling the volume flow of the pulse fluid flow flowing through the fluid passage.

It is advantageous if the device comprises a regulating device for regulating the volume flow of the pulse fluid flow flowing through the fluid passage.

In order to easily set, control and / or regulate the pulse fluid flow flowing through the fluid passage, it is advantageous if a closing time, an open time and / or an opening frequency of the blocking element can be adjusted, controlled and / or regulated.

An opening frequency in this specification and in the appended claims means the number of open phases of the blocking element per unit of time.

Furthermore, it can be provided that the device comprises an adjusting device, a control device and / or a regulating device for setting, controlling or regulating a pressure of the pulse fluid flow flowing through the fluid passage.

In a development of the invention, it can be provided that a total fluid flow flowing through the device can be divided into a pulse fluid flow flowing through the fluid passage and a bypass fluid flow flowing through the bypass such that a volume flow of the bypass gas flowing through the bypass Fluid flow is at most about 10% of a volume flow of the total fluid flow.

It is advantageous if the blocking element is designed such that it can be operated with an opening frequency of at least approximately 2 Hz.

It is advantageous if the blocking element is designed to be rotatable. The opening frequency is then twice as large as the rotational frequency of the blocking element.

In order to generate a pulsed beam which pulsates with as constant a frequency as possible, it is favorable if the device comprises a rotary drive for the blocking element, in particular with adjustable, controllable and / or controllable speed.

Preferably, such a rotary drive is designed as a pneumatic, hydraulic or electrical rotary drive.

In practice, it has proved to be advantageous if the blocking element is designed such that it can be operated with an opening frequency of at most approximately 200 Hz.

It is favorable if the device comprises a pump for driving a flow of a fluid through the device.

It is particularly favorable if the fluid flowing through the device can be acted on by means of the pump with a predetermined pressure.

In one embodiment of the invention, it is provided that the fluid flowing through the device can be acted upon by a pressure of at least approximately 3 bar.

Furthermore, it is favorable if the fluid flowing through the device can be acted upon by a pressure of at most approximately 300 bar.

In one embodiment of the invention, it is provided that a fluid connection between the fluid inlet and the fluid outlet is formed by means of the bypass. As a result, it is particularly easy to supply fluid to the fluid outlet during the closing phases of the blocking element.

Preferably, the device comprises a damping element for reducing pressure peaks occurring in the closing phase of the blocking element in the device for generating a pulsed jet of liquid fluid.

It is advantageous if the damping element is arranged downstream of a pump in a flow direction in which the fluid flows through the device. In this way, pressure peaks generated by the pump can be easily damped.

It is particularly favorable when the damping element is arranged in the flow direction upstream of the blocking element. As a result, pressure peaks occurring at the blocking element can be easily damped.

In one embodiment of the invention, it is provided that the damping element is at least partially filled with a compressible fluid in an operating state of the device. This can be done in the device occurring pressure peaks are particularly easily reduced by means of the damping element.

It is particularly favorable when the damping element is at least partially filled with a gaseous fluid in an operating state of the device. In particular, by the choice of the gas pressure and the amount of gas then the damping of the damping element can be adjusted specifically.

Alternatively or additionally, it can be provided that the damping element is at least partially formed of an elastic material.

For example, it can be provided that, up to a predetermined limit pressure, damping of the damping element essentially takes place by the compression of gas contained therein and that at a pressure above the limit pressure, for example to avoid possible damage to the device, a deformation of an elastic region of the damping element he follows.

In a preferred embodiment of the invention it is provided that the device comprises at least two fluid outlets and at least two blocking elements, wherein a first blocking element cyclically closes and releases a first fluid passage during operation of the device, so that at a first fluid outlet a first pulsed jet of a liquid fluid can be generated, and wherein during operation of the device, a second blocking element cyclically closes and releases a second fluid passage, so that at a second fluid outlet, a second pulsed jet of a liquid fluid can be generated. As a result, for example, a workpiece to be cleaned can be acted upon by two pulsed jets of a liquid fluid.

A simple construction of the device is ensured, in particular, if liquid of the same type is used for all the jets. Alternatively, however, it can also be provided that liquid fluids of different types are used for different jets.

It is favorable if the device is operable such that the closing and open phases of the first blocking element are offset in time from the closing and open phases of the second blocking element.

In particular, it can be provided that the device is operable so that the closing phases of the first locking element coincide in time substantially with the open phases of the second locking element and the open phases of the first locking element substantially coincide with the closing phases of the second locking element.

Preferably, the device is operable so that there is no temporal overlap between the open phases of the first blocking element and the open phases of the second blocking element.

A time offset of the closing and open phases of the first locking element against the closing and open phases of the second locking element is particularly easy to implement, when the at least two locking elements are coupled together.

In a development of the invention, it is provided that the device comprises a common drive for driving at least two blocking elements or at least two drives synchronized with one another for driving at least two blocking elements.

In the event that the device comprises a common drive for the at least two blocking elements, the at least two blocking elements are preferably coupled to the common drive, that during operation of the device, the closing and open phases of the first blocking element against the closing and open phases of the second locking element are offset.

In the event that the device at least two drives for the at least two blocking elements, in particular for each blocking element a separate

Drive, comprises, the at least two drives are preferably synchronized with each other so that during operation of the device, the closing and open phases of the first locking element are offset in time against the closing and open phases of the second locking element.

Preferably, the device comprises at least two bypasses, wherein a liquid fluid can be supplied to the first fluid outlet by a first bypass during a closing phase of the first blocking element and wherein a liquid fluid can be supplied to the second fluid outlet by a second bypass during a closing phase of the second blocking element.

A further object of the present invention is to provide a method for producing a pulsed jet of a liquid fluid, which enables an improved mechanical action on an object impinged by the pulsed beam, in particular on a workpiece.

• Erzeugen von Pulsen des gepulsten Strahls durch zyklisches Unterbrechen eines Fluidstroms durch einen Fluiddurchgang;
• Beaufschlagen des Werkstücks mit den Pulsen des gepulsten Strahls;
• Beaufschlagen des Werkstücks auch während der zyklischen Unterbrechungen des Fluidstroms durch den Fluiddurchgang mit einem Bypass-Fluidstrom des Fluids.

This object is achieved according to the invention by a method for subjecting a workpiece to a pulsed jet of a liquid fluid, the method comprising the following method steps:

• Generating pulses of the pulsed beam by cyclically interrupting a flow of fluid through a fluid passage;
• Impinging the workpiece with the pulses of the pulsed beam;
• Pressurizing the workpiece even during cyclic interruptions of the fluid flow through the fluid passage with a bypass fluid flow of the fluid.

Preferably, the method of exposing a workpiece to a pulsed jet of liquid fluid has the features and advantages described above in connection with the inventive device.

In one embodiment of the method, it is provided that pressure peaks occurring during the cyclical interruptions of the fluid flow through the fluid passage are reduced by means of a damping element.

It is advantageous if the workpiece is acted upon by at least one further pulsed jet of a liquid fluid.

It is particularly favorable if the pulses of a first pulsed beam are offset in time with respect to the pulses of a second pulsed beam.

In particular, it can be provided here that the time of the exit of the pulses of a first pulsed jet at the first fluid outlet is offset in time with respect to the time of the exit of the pulses of a second pulsed jet at a second fluid outlet.

In particular, it can be provided that the workpiece is applied alternately with pulses of a first pulsed beam and with pulses of a second pulsed beam.

It is favorable if a pulse frequency of the first pulsed beam corresponds at least approximately to a pulse frequency of the second pulsed beam.

It can be provided that the workpiece is acted upon by a first pulsed beam from a first direction and a second pulsed beam from a different direction from the first direction, the second direction with liquid fluid.

It is advantageous if the outlet direction of the first pulsed jet from the first fluid outlet is at least approximately opposite to the outlet direction of the second pulsed jet from the second fluid outlet. In one embodiment of the invention, it is provided that a cavity of the workpiece is applied alternately to the pulses of a first pulsed jet of liquid fluid flowing through a first access opening of the cavity and to the pulses of a second pulsed jet of liquid fluid flowing through a second access opening of the cavity becomes.

In this way, in the cavity of the workpiece stuck contaminants, for example, during machining of the workpiece resulting chips, especially chips in tight spaces of, for example, cylinder heads, particularly easily loosened and removed from the cavity of the workpiece.

For example, it may be provided here that the first pulsed beam is directed onto the first access opening and the second pulsed beam is directed onto the second access opening.

A particularly secure loading of the cavity of the workpiece with fluid is ensured in particular when the first fluid outlet is introduced through the first access opening and the second fluid outlet through the second access opening into the cavity.

In a further development of the invention, it is provided that a region of a cavity of the workpiece is acted upon by the pulses of a first pulsed jet of a liquid fluid and with the pulses of a second pulsed jet of a liquid fluid such that the fluid from the first pulsed jet and the Fluid from the second pulsed beam to flow through the region of the cavity of the workpiece in different directions.

Preferably, the fluid from the first pulsed beam and the fluid from the second pulsed beam flow through the region of the cavity of the workpiece in opposite directions.

A particularly advantageous loading of the region of the cavity of the workpiece with fluid is ensured, in particular, when the region of the cavity of the workpiece is alternately acted upon by pulses of the first pulsed jet of a liquid fluid and with pulses of the second pulsed jet of a liquid fluid.

The device according to the invention is particularly suitable for cleaning a workpiece, the method according to the invention preferably being carried out.

The fluid flowing through the device preferably comprises a cleaning fluid.

Particularly preferred is the use of the device according to the invention for cleaning cavities of workpieces, such as cylinder heads and crankcases, since the workpieces are acted upon during closing phases of the blocking element with fluid and no cleaning effect of the pulsed jet diminishing air can get into the workpiece.

During a cleaning process, the workpiece can basically be surrounded by a gas or gas mixture or by a liquid, for example a cleaning liquid.

Furthermore, provision may be made for the workpiece to be cleaned in a low-pressure atmosphere (below the atmospheric pressure).

Further features and advantages of the invention are the subject of the following description and the drawings of exemplary embodiments.

Fig. 1

eine schematische Darstellung einer ersten Ausführungsform einer Vorrichtung zum Erzeugen eines gepulsten Strahls eines flüssigen Fluids;

Fig. 2

einen schematischen Längsschnitt durch ein Pulsventil der Vorrichtung zum Erzeugen eines gepulsten Strahls eines flüssigen Fluids aus Fig. 1, in einer Schließstellung des Pulsventils;

Fig. 3

einen zu dem Schnitt aus Fig. 2 senkrechten schematischen Längsschnitt durch das Pulsventil aus Fig. 2, längs der Linie 3-3 in Fig. 2;

Fig. 4

einen der Fig. 2 entsprechenden schematischen Längsschnitt durch das Pulsventil aus Fig. 2, in einer Offenstellung des Pulsventils;

Fig. 5

eine schematische Darstellung einer zweiten Ausführungsform einer Vorrichtung zum Erzeugen eines gepulsten Strahls eines flüssigen Fluids, welche ein mit einem komprimierbaren Fluid befülltes Dämpfungselement zur Verringerung von Druckspitzen aufweist;

Fig. 6

eine schematische Darstellung einer dritten Ausführungsform einer Vorrichtung zum Erzeugen eines gepulsten Strahls eines flüssigen Fluids, welche ein elastisch verformbares Dämpfungselement zur Verringerung von Druckspitzen aufweist, in einer Offenstellung des Pulsventils;

Fig. 7

eine schematische Darstellung der Vorrichtung zum Erzeugen eines gepulsten Strahls eines flüssigen Fluids aus Fig. 6, in einer Schließstellung des Pulsventils;

Fig. 8

eine der Fig. 1 entsprechende schematische Darstellung einer vierten Ausführungsform einer Vorrichtung zum Erzeugen eines gepulsten Strahls eines flüssigen Fluids, bei der ein weiterer gepulster Strahl erzeugbar ist; und

Fig. 9

eine der Fig. 1 entsprechende schematische Darstellung einer fünften Ausführungsform einer Vorrichtung zum Erzeugen eines gepulsten Strahls eines flüssigen Fluids, bei der zwei gepulste Strahlen eines flüssigen Fluids mittels eines gemeinsamen Antriebs erzeugbar sind.

In the drawings show:

Fig. 1

a schematic representation of a first embodiment of an apparatus for generating a pulsed jet of a liquid fluid;

Fig. 2

a schematic longitudinal section through a pulse valve of the device for generating a pulsed jet of a liquid fluid Fig. 1 in a closed position of the pulse valve;

Fig. 3

one to the cut off Fig. 2 vertical schematic longitudinal section through the pulse valve Fig. 2 , along the line 3-3 in Fig. 2 ;

Fig. 4

one of the Fig. 2 corresponding schematic longitudinal section through the pulse valve Fig. 2 in an open position of the pulse valve;

Fig. 5

a schematic representation of a second embodiment of an apparatus for generating a pulsed jet of a liquid fluid having a filled with a compressible fluid damping element for reducing pressure peaks;

Fig. 6

a schematic representation of a third embodiment of an apparatus for generating a pulsed jet of a liquid fluid having an elastically deformable damping element for reducing pressure peaks, in an open position of the pulse valve;

Fig. 7

a schematic representation of the apparatus for generating a pulsed jet of a liquid fluid Fig. 6 in a closed position of the pulse valve;

Fig. 8

one of the Fig. 1 corresponding schematic representation of a fourth embodiment of an apparatus for generating a pulsed jet of liquid fluid, in which a further pulsed beam can be generated; and

Fig. 9

one of the Fig. 1 corresponding schematic representation of a fifth embodiment of an apparatus for generating a pulsed jet of a liquid fluid, in which two pulsed jets of a liquid fluid can be generated by means of a common drive.

Identical or functionally equivalent elements are denoted by the same reference numerals in all figures.

An in Fig. 1 1, shown schematically as 100 as a whole, for generating a pulsed jet of liquid fluid (hereinafter referred to as "jet generating device") is formed as a cleaning device 102 for cleaning a workpiece 104.

The cleaning device 102 comprises a fluid container 106, a pump 108, a pulse valve 110, a bypass 112 and a nozzle 114.

The fluid container 106 is filled, for example, with a liquid cleaning fluid and serves as a reservoir for flowing through the cleaning device 102 fluid.

The fluid container 106 is in fluid communication with the pump 108 via a suction line 107.

A fluid inlet opening 109 of the suction line 107 forms a fluid inlet 116 of the cleaning device 102.

By means of the pump 108, a flow of the fluid through the cleaning device 102 driven and the fluid can be pressurized.

In this case, a cleaning device 102 in a flow direction 118 flowing through total fluid flow is generated.

The pump 108 is further in fluid communication with a branch 120 located downstream of the pump 108 via a supply line 121.

By means of the branch 120, the total fluid flow flowing through the cleaning device 102 can be divided into a first partial fluid flow and a second partial fluid flow.

The first partial fluid flow of the total fluid flow flowing through the cleaning device 102 can be supplied to a fluid passage 122, which forms a first fluid connection between the fluid inlet 116 and a fluid outlet 124 arranged on the nozzle 114.

The first partial fluid flow flowing through the fluid passage 122 is referred to below as the pulse fluid flow.

The second partial fluid flow of the total fluid flow flowing through the cleaning device 102 can be supplied to the bypass 112, which forms a second fluid connection between the fluid inlet 116 and the fluid outlet 124.

The second partial fluid flow flowing through the bypass 112 is referred to below as the bypass fluid flow.

The bypass fluid stream flowing through the bypass 112 is connected to the fluid flow passing through the fluid passage 122 through a junction 126 located downstream of the fluid passage 122 merge into a total fluid flow. The total fluid flow can be fed to the fluid outlet 124 arranged on the nozzle 114.

For this purpose, the cleaning device 102 comprises a nozzle supply line 125, which forms a fluid connection between the junction 126 and the fluid outlet 124.

In order to be able to adjust the bypass fluid flow flowing through the bypass 112, for example with regard to its volume flow, the cleaning device 102 comprises an adjustment device 128 of the bypass 112, which is arranged, for example, on the bypass 112.

The adjusting device 128 of the bypass 112 is designed, for example, as an adjusting screw in order to be able to easily set a passage cross section of the bypass 112 and thus the volume flow of the bypass fluid flow.

In order to be able to adjust the volume flow of the pulse fluid flow flowing through the fluid passage 122, the cleaning device 102 comprises an adjusting device 130 of the fluid passage 122, which is arranged, for example, downstream of the branch 120 and upstream of the pulse valve 110.

The adjusting device 130 of the fluid passage 122 is designed, for example, as an adjusting screw in order to be able to easily set a passage cross-section of the fluid passage 122 and thus the volume flow of the pulse fluid flow.

In the Fig. 2 and 3 are schematic sectional drawings of the pulse valve 110 shown during a closing phase in which the flowing through the fluid passage 122 pulse fluid flow is interrupted.

The basic structure of such a pulse valve 110 is for example from the WO 03/036144 A1 to which extent to which reference is made and whose contents are made part of this description.

The pulse valve 110 comprises a housing 132, a blocking element 134 which is rotatably mounted in the housing 132 and a rotary drive 136, for example designed as an electric motor, for driving a rotational movement of the blocking element 134 (see FIG Fig. 3 ).

The blocking element 134 is designed as a substantially cylindrical shaft 138 and, for example, by means of at least one plain bearing bush 140 rotatably mounted about an axis of rotation 142 in the housing 132 of the pulse valve 110.

The blocking element 134 has a cylindrical lateral surface 144 coaxial with the axis of rotation 142.

In the lateral surface 144 of the locking element 134, two diametrically opposite recesses 146 are formed, each of which is delimited by a cylinder shell portion-shaped boundary surface 148, the cylinder axis 150 perpendicular to the axis of rotation 142, perpendicular to the radial direction of the locking element 134 and tangential to the lateral surface 144 of the locking element 134th runs, and which along an edge 152 on the lateral surface 144 of the locking element 134 open (see in particular Fig. 3 ).

The depressions 146 are formed in the blocking element 134 in that from the initially fully cylindrical blocking element 134, two cylinder-segment-shaped segments are milled out with the mutually parallel cylinder axes 150, wherein the cylinder radius is smaller than the radius of the blocking element 134, so that between the depressions 146 a land area 154 stops (see in particular Fig. 3 ).

Furthermore, the pulse valve 110 has a pulse valve inlet 156 and a pulse valve outlet 158.

Pulse valve inlet 156 and pulse valve outlet 158 are connected by a fluid passage 160.

The blocking element 134 is arranged in the fluid passage 160 such that the fluid connection between the pulse valve inlet 156 and the Pulsventilauslass 158 by rotation of the locking member 134 is cyclically produced and separable.

In the in the Fig. 2 and 3 illustrated closed position of the pulse valve 110 is parallel to the cylinder axes 150 extending land portion 154 of the locking element 134 is aligned substantially perpendicular to the flow direction 118.

In the in Fig. 4 illustrated open position of the pulse valve 110, the web portion 154 of the blocking element 134 is aligned substantially parallel to the flow direction 118.

The above-described cleaning device 102 functions as follows:

By means of the pump 108, fluid is sucked out of the fluid container 106 via the suction line 107 and pressurized.

On the one hand, it is favorable if the pressure is at least approximately 3 bar.

On the other hand, the pressure should not be higher than about 300 bar.

Downstream of the pump 108, the total fluid flow flowing through the cleaning device 102 passes through the supply line 121 to the branch 120.

By means of the branch 120, a division of the total fluid flow to the pulse fluid flow, which flows through the fluid passage 122, and the bypass fluid flow, which flows through the bypass 112 takes place.

By means of the adjusting device 130 of the fluid passage 122, the volume flow of the pulse fluid flow flowing through the fluid passage 122 is set.

By means of the adjusting device 128 of the bypass 112, the volume flow of the flowing through the bypass 112 bypass fluid flow is adjusted.

The volume flow of the bypass fluid flow flowing through the bypass 112 is substantially constant over time.

The pulse fluid flow flowing through the fluid passage 122 is cyclically interrupted by means of the pulse valve 110.

An open time, a closing time and / or an opening frequency of the blocking element 134 of the pulse valve 110 is set, for example, on the rotary drive 136.

Preferably, an opening frequency of about 2 Hz to about 200 Hz is set, wherein a rotational speed of the blocking element 134 is preferably constant over time.

By means of the merge 126, the temporally substantially constant bypass fluid flow and the pulsating pulse fluid flow are combined to form the total fluid flow.

Downstream, the total fluid flow reaches the nozzle 114 and exits the nozzle 114 through the fluid outlet 124.

For example, downstream of the nozzle 114 and spaced therefrom, the workpiece 104 to be cleaned by means of the cleaning device 102 is arranged.

The workpiece 104 includes, for example, a cavity 162 to be cleaned, which is supplied with the fluid from the fluid outlet 124.

Characterized in that the cavity 162 of the workpiece 104 is always at least applied to the bypass fluid flow flowing through the bypass 112, the cavity 162 of the workpiece 104 is always filled with liquid fluid.

When cleaning the workpiece 104 in an air atmosphere, therefore, during the closing phases of the pulse valve 110, in which the pulse fluid flow flowing through the fluid passage 122 is interrupted, no air can penetrate into the cavity 162 of the workpiece 104.

The cleaning of the cavity 162 of the workpiece 104 from impurities, for example metal shavings, by means of the cleaning device 102 is thereby improved.

An in Fig. 5 illustrated second embodiment of a beam generating device 100 differs from that in the Fig. 1 to 4 illustrated first embodiment in that the beam generating device 100 comprises a damping element 164.

By means of the damping element 164, pressure peaks which arise during closing phases of the blocking element 134 can be damped.

The damping element 164 comprises a, for example substantially tubular, container 166, which is at least partially filled with a gas, for example nitrogen, in an operating state of the jet-generating device 100.

By selecting the amount and the pressure of the gas, the damping of the damping element 164 is adjustable.

The reservoir 166 is located downstream of the pump 108 and upstream of the manifold 120 and is in fluid communication with the supply line 121 of the jet generating device 100.

The above-described second embodiment of the jet generating apparatus 100 with the damping member 164 functions as follows.

By the cyclic opening and closing of the fluid passage 122 by means of the blocking element 134 of the pulse valve 110, a strong pressure fluctuation is generated in the jet generating device 100, in particular upstream of the pulse valve 110.

By means of the damping element 164, this pressure fluctuation can be reduced.

This is accomplished by compressing gas in the reservoir 166 of the damping element 164 as the pressure in the jet generating device 100 increases during the closing phases of the locking element 134 of the pulse valve 110 and the reservoir 166 of the damping element 164 compresses liquid fluid from the supply line 121 of the jet generating device 100 can record.

This reduces the pressure generated by the pump 108 in the jet generating device 100.

During the open phases of the blocking element 134 of the pulse valve 110, the pressure in the jet generating device 100 decreases, so that the fluid from the container 166 of the damping element 164 flows back into the supply line 121 of the jet generating device 100 and the gas arranged in the container 166 of the damping element 164 relaxed.

Incidentally, the in Fig. 5 illustrated second embodiment of the jet generating device 100 in terms of structure and function with in the Fig. 1 to 4 illustrated in the first embodiment, reference is made to the above description in this regard.

One in the Fig. 6 and 7 illustrated third embodiment of a beam generating device 100 differs from the in Fig. 5 illustrated second embodiment in that the container 166 of the damping element 164 is formed of an elastic material.

In the container 166, preferably no compressible gas is present.

Rather, there is a damping effect of the damping element 164 during operation of the jet generating device 100 in that an increase in pressure during the closing phases of the locking element 134 of the pulse valve 110 to an extension of the resiliently formed container 166 of the damping element 164, thereby receiving fluid in the container 166 of Damper element 164 and finally leads to pressure reduction in the jet generating device 100.

During the open phases of the blocking element 134 of the pulse valve 110, the pressure in the jet generating device 100 decreases, so that the fluid arranged in the container 166 of the damping element 164 flows back into the supply line 121 of the jet generating device 100 and the container 166 of the damping element 164 returns to a relaxation state.

To compare the expansion of the container 166 of the damping element 164 during the open and closed phases of the locking element 134 of the pulse valve 110 is in Fig. 6 a jet generating device 100 during an open phase of the blocking element 134 of the pulse valve 110 and in Fig. 7 a jet generating device 100 during a closing phase of the blocking element 134 of the pulse valve 110 is shown.

Incidentally, the right in the Fig. 6 and 7 illustrated third embodiment of the jet generating device 100 in structure and function with the in Fig. 5 illustrated second embodiment, to the above description in this respect reference is made.

An in Fig. 8 illustrated fourth embodiment of a beam generating device 100 differs from that in the Fig. 1 to 4 illustrated first embodiment in that in addition to the already described pulsed beam (hereinafter referred to as "first pulsed beam") at least a second pulsed beam of a liquid fluid can be generated.

For this purpose, the jet-generating device 100 comprises a branch 168 which is arranged in the supply line 121 between the pump 108 and the branch 120 and the fluid flow downstream of the pump 108 onto a first supply line 121a for the first pulsed jet of liquid fluid and to a second supply line 121b for the second pulsed jet of liquid fluid.

For generating the two pulsed jets of the liquid fluid, the jet-generating device 100 downstream of the first supply line 121a and downstream of the second supply line 121b preferably comprises in each case those components which in the in the Fig. 1 to 4 illustrated first embodiment downstream of the feed line 121 are arranged.

In particular, the jet generating device 100 thus comprises a second fluid passage 170 corresponding to the first fluid passage 122, which can be interrupted, in particular cyclically, by means of a second pulse valve 172 corresponding to the first pulse valve 110, a second nozzle 174 corresponding to the first nozzle 114, at which a first fluid outlet 124 corresponding second fluid outlet 176 is arranged, and a first bypass 112 corresponding to the second bypass 178, by means of which the second fluid outlet 176, fluid can be supplied even during closing phases of the second pulse valve 172.

In order to be able to adjust the fluid flow flowing through the second bypass 178, for example with regard to its volume flow, the jet generating device 100 comprises an adjustment device 180 of the second bypass 178 corresponding to the setting device 128 of the first bypass 112, which is arranged on the second bypass 178.

In order to be able to adjust the fluid flow flowing through the second fluid passage 170, for example with respect to its volume flow, the jet generating device 100 comprises a setting device 182 of the second fluid passage 170 corresponding to the setting device 130 of the first fluid passage 122, which is arranged on the second fluid passage 170.

The components arranged downstream of the first supply line 121a and the components of the jet generating device 100 arranged downstream of the second supply line 121b are identical in construction and function to those in FIG Fig. 1 shown downstream of the supply line 121 and with reference to the above Fig. 2 to 4 explained in more detail components of the first embodiment of the beam generating device 100, to the above description of which reference is made.

A particularly preferred use of the fourth embodiment of the jet-generating device 100 results from the possibility of applying the second pulsed jet emerging from the second fluid outlet 176 to the workpiece 104 in addition to the first pulsed jet emerging at the first fluid outlet 124.

In particular, this allows the workpiece 104, for example from different directions, to be acted upon alternately with pulses of the first pulsed beam and with pulses of the second pulsed beam.

By means of the jet-generating device 100, in particular a cavity 162 of the workpiece 104, which is accessible through at least two access openings, can be acted upon with liquid fluid.

For this, the first nozzle 114 is preferably positioned relative to the workpiece 104 so that the fluid of the first pulsed jet flowing out of the first fluid outlet 124 flows through a first access opening 184 of the cavity 162 of the workpiece 104 into the cavity 162 of the workpiece 104 (see FIG Fig. 8 ).

Further, the second nozzle 174 is preferably positioned relative to the workpiece 104 such that the fluid of the second pulsed jet flowing out of the second fluid outlet 176 flows through a second access opening 186 of the cavity 162 of the workpiece 104 into the cavity 162 of the workpiece 104 (see FIG Fig. 8 ).

Preferably, the fluid of the pulses of the first pulsed jet of liquid fluid and the fluid of the pulses of the second pulsed jet of liquid fluid flow alternately and inwardly approximately equidistant from both access ports 184, 186 of cavity 162 different directions. In this way, it is caused that disposed in the cavity 162 of the workpiece 104 impurities, for example, in the processing of the workpiece 104 resulting chips can be loosened and easily removed from the cavity 162 of the workpiece 104, in particular washed out, can be.

In this case, the pulse frequency and the flow speed of the first pulsed jet and a time offset between the exit times of the pulses of the first pulsed jet at the first fluid outlet 124 and the exit times of the pulses of the second pulsed jet at the second fluid outlet 176 are desirably chosen such that the pressure maxima of the pulses of the first pulsed beam reach one end of the cavity 162 of the workpiece 104, in particular the second access opening 186 of the cavity 162 of the workpiece 104, before the pressure maxima of the pulses of the second pulsed beam through the second access opening 186 of the cavity 162 of the workpiece 104 into the cavity 162 of the workpiece 104 arrive.

Since the time offset between the exit times of the pulses of the first pulsed jet at the first fluid outlet 124 and the exit times of the pulses of the second pulsed jet at the second fluid outlet 176 is preferably the time lag between the exit times of the pulses of the second pulsed jet at the second fluid outlet 176 and the exit times If the pulses of the first pulsed beam at the first fluid outlet 124 correspond, in such a case, the pressure maxima of the pulses of the second pulsed beam will conveniently reach one end of the cavity 162 of the workpiece 104, in particular the first access opening 184 of the cavity 162 of the workpiece 104, before the Pressure maxima of the pulses of the first pulsed beam through the first access opening 184 of the cavity 162 of the workpiece 104 into the cavity 162 of the workpiece 104 pass.

Preferably, for this purpose, the pulse frequency is always chosen so that the duration of the pressure maxima of the pulses through the cavity 162 of the workpiece 104 is small compared to the period of the pulse sequence (reciprocal of the pulse frequency). In this way, the pulses of the first pulsed beam and the pulses of the second pulsed beam are prevented from hindering each other, thus making it difficult for the impurities to escape from the cavity 162 of the workpiece 104.

For example, a pulse frequency of, for example, about 70 Hz, a flow of, for example, 5 l / s and nozzles with a diameter of, for example, 6 mm can be selected.

Reliable compliance with a desired time offset between the exit times of the pulses of the first pulsed jet at the first fluid outlet 124 and the exit times of the pulses of the second pulsed jet at the second fluid outlet 176 is ensured in particular when the rotary drive 136 of the first blocking element 134 of the first pulse valve 110 is synchronized with a (not shown) rotary drive of the second locking element 192 of the second pulse valve 172.

In order to dampen pressure peaks within the jet generating device 100, in the fourth embodiment of the jet generating device 100, one or more of the ones shown in FIGS Fig. 5 to 7 be shown 164 provided damping elements.

Incidentally, the fourth embodiment of the jet generating device 100 is the same in structure and function as in FIG Fig. 1 to 4 illustrated first embodiment, so that reference is made to the above description in this respect.

An in Fig. 9 illustrated fifth embodiment of the beam generating device 100 differs from that in Fig. 8 illustrated fourth embodiment in that the first pulse valve 110 and the second pulse valve 172 have a common rotary drive 190.

By means of the common rotary drive 190, the first blocking element 134 of the first pulse valve 110 and a second blocking element 192 of the second pulse valve 172 are mechanically coupled to each other, so that no separate control for timing the pulses of the first pulsed beam to the pulses of the second pulsed beam is necessary ,

The mechanical coupling can take place, for example, by means of a drive belt 196, which is in operative connection with the common rotary drive 190, the first blocking element 134 and the second blocking element 192, so that a rotational movement from the common rotary drive 190 to the first blocking element 134 and the second blocking element 192 is transferable.

The first pulse valve 110 and the second pulse valve 172 differ from the in Fig. 3 illustrated pulse valve 110 of the first embodiment of the jet generating device 100, characterized in that the first locking element 134 and the second locking element 192 instead of a separate rotary drive 136 each have a (not shown) extension to which the drive belt 196 engages.

A particular time offset between the pulses of the first pulsed beam and the pulses of the second pulsed beam may be fixed by adjusting a rotational orientation of the first stop 134 and, independently thereof, a rotational orientation of the second stop 192 , Due to the mechanical coupling by means of the drive belt 196, the rotational orientations of the first locking element 134 and of the second locking element 192 are fixed relative to one another.

Assuming that the same translation occurs between a rotational movement of the common rotary actuator 190 and the rotational movement of the first locking member 134 and between the rotational movement of the common rotary actuator 190 and the rotational movement of the second locking member 192, the first locking member 134 and the second locking member 192 rotate with same frequency while maintaining the previously set Drehausrichtung relative to each other.

Owing to the arbitrary rotational orientation of the blocking elements 134, 192, an offset between the exit times of the pulses of the first pulsed jet at the first fluid outlet 124 and the exit times of the pulses of the second pulsed jet at the second fluid outlet 176 can be freely selected. In particular, this offset is freely selectable between about zero and, for example approximately the period of the pulse train (corresponding to half of the reciprocal of the rotational frequency of the locking elements 134, 192).

Furthermore, a separate rotary drive for the second blocking element 192 of the second pulse valve 172 is dispensable by the common rotary drive 190.

In the fifth embodiment of the beam generating device 100, alternately emitting pulses of the first pulsed beam and pulses of the second pulsed beam is possible, in particular, when the first blocking element 134 and the second blocking element 192 are coupled to the common rotary drive 190 such that the first land region 154 of the first locking element 134 is then aligned substantially parallel to the flow direction 118, when a second web portion 194 of the second locking member 192 is aligned substantially perpendicular to the flow direction 118 (see Fig. 9 ). The angular difference between the Drehausrichtung the first locking element 134 and the Drehausrichtung of the second locking element 192 is then 90 °.

Incidentally, the in Fig. 9 illustrated fifth embodiment of the jet generating device 100 in structure and function with the in Fig. 8 4, the above description of which is incorporated herein by reference.

In particular, can thus also in the in Fig. 9 illustrated fifth embodiment of the jet generating device 100 may be provided that the beam generating device 100 one or more of the in the Fig. 5 to 7 illustrated damping elements 164 includes.

By virtue of the fact that in each of the embodiments described above, at least part of the fluid stream flowing through the jet generating device 100 can always be supplied to the workpiece 104, an improved mechanical effect on an object impinged by the pulsed jet is possible.

Claims (14)

1. Device for generating a pulsed jet of a liquid fluid comprising a fluid inlet (116), a fluid outlet (124, 176) and a blocking element (134, 192) arranged between the fluid inlet (116) and the fluid outlet (124, 176), which cyclically closes and opens a fluid passage (122, 170) between the fluid inlet (116) and the fluid outlet (124, 176), characterised in that the device (100) comprises at least one bypass (112, 178), through which a liquid fluid is feedable to the fluid outlet (124, 176) even during a closing phase of the blocking element (134, 192).
2. Device according to claim 1, characterised in that the device (100) comprises an adjusting device (128, 180) for adjusting a volume flow of a bypass fluid flow flowing through the bypass (112, 178) and/or an adjusting device (130, 182) for adjusting a volume flow of a pulsed fluid flow flowing through the fluid passage (122, 170).
3. Device according to claim 1 or 2, characterised in that the device (100) comprises a damping element (164) for reducing pressure peaks occurring in the device (100) in the closing phase of the blocking element (134, 192), wherein the damping element (164) is at least partially filled with a compressible fluid in an operating state of the device (100).
4. Device according to claim 1 or 2, characterised in that the device (100) comprises a damping element (164) for reducing pressure peaks occurring in the device (100) in the closing phase of the blocking element (134, 192), wherein the damping element (164) is formed at least in sections from an elastic material.
5. Device according to one of claims 1 to 4, characterised in that the device (100) comprises at least two fluid outlets (124, 176) and at least two blocking elements (134, 192), wherein a first blocking element (134) cyclically closes and opens a first fluid passage (122), so that a first pulsed jet of a liquid fluid is generatable at a first fluid outlet (124), and wherein a second blocking element (192) cyclically closes and opens a second fluid passage (170), so that a second pulsed jet of a liquid fluid is generable at a second fluid outlet (176).
6. Device according to claim 5, characterised in that the device (100) is so operable that the closing and open phases of the first blocking element (134) are staggered in time in relation to the closing and open phases of the second blocking element (192).
7. Device according to one of claims 5 or 6, characterised in that the device (100) comprises a common drive (190) for driving at least two blocking elements (134, 192) or at least two drives synchronised to one another for driving at least two blocking elements (134, 192).
8. Process for subjecting a workpiece (104) to a pulsed jet of a liquid fluid, comprising the following process steps:

   • generating pulses of the pulsed jet by cyclically interrupting a fluid flow through a fluid passage (122, 170);

   • subjecting the workpiece (104) to the pulses of the pulsed jet;

   • subjecting the workpiece (104) to a bypass fluid flow of the fluid even during the cyclical interruptions of the fluid flow through the fluid passage (122, 170).
9. Process according to claim 8, characterised in that the workpiece (104) is subjected to at least one further pulsed jet of a liquid fluid.
10. Process according to claim 9, characterised in that the pulses of a first pulsed jet are staggered in time in relation to the pulses of a second pulsed jet.
11. Process according to claim 10, characterised in that the workpiece (104) is alternately subjected to pulses of a first pulsed jet and to pulses of a second pulsed jet.
12. Process according to claim 11, characterised in that a cavity (162) of the workpiece (104) is alternately subjected to pulses of a first pulsed jet of a liquid fluid flowing through a first access opening (184) of the cavity (162) and to pulses of a second pulsed jet of a liquid fluid flowing through a second access opening (186) of the cavity (162).
13. Process according to one of claims 9 to 12, characterised in that a region (188) of a cavity (162) of the workpiece (104) is subjected to the pulses of a first pulsed jet of a liquid fluid and to the pulses of a second pulsed jet of a liquid fluid in such a manner that the fluid from the first pulsed jet and the fluid from the second pulsed jet flow through the region (188) of the cavity (162) of the workpiece (104) in different directions.
14. Use of the device (100) according to one of claims 1 to 7 for cleaning a workpiece (104), in particular by means of the process according to one of claims 8 to 13.

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