WO2005037489A1

WO2005037489A1 - Device for generating a rotating fluid jet

Info

Publication number: WO2005037489A1
Application number: PCT/EP2004/011723
Authority: WO
Inventors: Johan Szücs
Original assignee: Szuecs Johan
Priority date: 2003-10-17
Filing date: 2004-10-18
Publication date: 2005-04-28
Also published as: DE20315998U1

Abstract

The invention relates to a device for generating a fluid jet that rotates about a jet axis (R). Said device comprises: (a) a nozzle (8, 9) through which the jet is discharged in the direction of the jet axis (R); (b) a mixing chamber (5); (c) a mixing chamber outlet (6) which connects the mixing chamber (5) to the nozzle (8, 9) and through which the jet axis (R) extends; (d) a first feeding duct (10) through which a first fluid flow can be introduced into the mixing chamber (5); and (e) a second feeding duct (20) through which a second fluid flow can be introduced into the mixing chamber (5) and which extends eccentric and diagonal to the jet axis (R) and the first feeding duct (10). The inventive device is characterized in that (f) the first feeding duct (10) also extends diagonal or eccentric to the jet axis (R).

Description

Device for generating a rotating fluid jet

The invention relates to a device for generating a fluid jet which rotates about a jet axis pointing in the jet direction. The device can be used in particular for the gentle treatment of surfaces, preferably cleaning. In particular, it is suitable for the treatment of sensitive surfaces of, for example, monuments, sculptures, vehicles, including air and water vehicles. It is preferably a hand-held device, particularly preferably in the form of a cleaning gun.

Devices are known for the gentle treatment of surfaces which produce a rotating, conically spreading cleaning jet. The cleaning jet is generated in a mixing chamber of the device by the special way of bringing together fluid flows. For example, EP 0 171 448 B1 describes a tried and tested principle according to which an air-granulate stream is introduced into the mixing chamber through a central supply line concentric with the jet axis via an atomizing nozzle and obliquely and eccentrically to the water stream. The two fluid streams, including the granulate contained in the one stream, are swirled by this special feed in the mixing chamber and ejected in a jet direction through a nozzle. The emerging jet rotates around its jet axis pointing in the direction of the jet, so that the conical mixture jet is created. A considerable part of the kinetic energy of the beam is in the rotational movement, so that the impact energy in the direction of the beam when the beam strikes the surface to be treated compared to a beam that only progresses in translation same total energy significantly reduced and therefore the treatment of the surface can be carried out particularly gently using a kind of wiping movement.

In order to improve the mixing of the fluid streams in the mixing chamber and to reduce their wear, EP 0 582 191 A1 proposes to form the atomizing nozzle for the water into a narrow and wide slot nozzle. The air-granulate mixture is again eccentrically and obliquely fed into the mixing chamber to the central slot nozzle, so that the fluid flows in the mixing chamber are swirled according to the principle known from EP 0 171 448 B1 in order to obtain the rotating mixture jet at the nozzle outlet , The thin but wide water jet generated by means of the slot nozzle shields the chamber wall from the air-granulate mixture jet entering the mixing chamber at least partially, so that wear is reduced and the mixing and swirling of the fluid streams in the mixing chamber are intensified.

It is an object of the invention to further reduce the wear on devices which generate a rotating mixture jet.

The invention is based on a device for generating a fluid jet rotating about a jet axis and comprises a nozzle through which the jet emerges in a jet direction along the jet axis, a mixing chamber for mixing and swirling fluid streams introduced into the mixing chamber, a mixing chamber outlet, which Mixing chamber connects to the nozzle and through which the jet axis extends, and at least two feed lines through which the fluid flows to be mixed and swirled can be introduced into the mixing chamber. The mixing chamber is delimited by a chamber wall which is preferably curved continuously around the jet axis. The mixing chamber can in particular be cylindrical. It is preferably rotationally symmetrical with the beam axis as the axis of symmetry. As in the known devices, the rotational movement of the mixture is brought about in that at least two fluid flows are introduced eccentrically and at an angle to one another into the mixing chamber through the at least two feed lines, in order to mix there and form a mixture vortex, which then emerges from the nozzle forms the rotating fluid jet. Although more than two feed lines to the Mixing accordingly more than two fluid flows can be provided, it corresponds to preferred embodiments if exactly two feed lines lead into the mixing chamber.

According to the invention, not only does one supply line of the at least two supply lines run eccentrically and at an angle to the jet axis in order to introduce the fluid stream entering the mixing chamber through this supply line eccentrically and at an angle to the beam axis, but the other supply line of the at least two supply lines either runs eccentrically or angled or both eccentric and angled to the jet axis, in order to also eccentrically and / or introduce the fluid flow entering the mixing chamber through them into the mixing chamber. A course eccentric to the jet axis means that the center of gravity of the flow cross-section of the feed line in question does not lie on the jet axis at its mouth into the mixing chamber. In a preferred embodiment, the beam axis does not even run through the mouth of the eccentric feed line, i. H. the mouth of which is arranged next to the beam axis. If both supply lines are eccentric, it is advantageous if the mouths of both supply lines are arranged in this way. The at least one eccentric feed line forms an inflow axis with a corresponding eccentricity for the fluid flow introduced through it. In a further preferred embodiment, the inflow axis runs in such a way that it does not intersect the jet axis itself, but only its parallel projection in the case of an inclined course. For the other of the at least two supply lines, this preferably applies in the same way.

By introducing both fluid streams eccentrically to the jet axis, the lever arm between the fluid streams, which increases angular momentum during the swirling, can be enlarged and the swirling correspondingly increased. An eccentricity of both supply lines also has the result that the fluid streams supplied through such supply lines are each introduced closer to the chamber wall than a fluid stream supplied centrally on the jet axis, and thereby both the one and the other of the at least two fluid streams counter the chamber wall can protect each other better than a centrally introduced fluid flow. If both the first and the second supply line run at an angle, ie with an inclination greater than 0 ° and less than 90 ° to the jet axis, the inclination to the jet axis can be smaller for each of the fluid streams and the angle to the chamber wall can be more acute than with only one of the supply lines when the slope is inclined. This measure also reduces wear. The inclinations to the jet axis are selected such that each of the fluid streams is introduced into the mixing chamber with an inclination, but nevertheless with a speed component pointing in the jet direction. If both the first feed line and the second feed line run eccentrically and at an angle to the jet axis, a particularly intensive and therefore uniform mixing of the fluid streams is achieved with the formation of a mixture vortex. The beneficial effects of both measures are combined.

It is advantageous if at least one, preferably exactly one, of the fluid streams is directed away from the jet axis in the direction of an outer surface of the chamber wall. In order to achieve this, at least one of the supply lines runs in at least one end section opening into the mixing chamber and points away from the jet axis in the direction of the relevant chamber wall. The angle of inclination of the end section of the relevant feed line and thus the angle of inclination of the fluid flow introduced through this feed line should be at least 5 ° and at most 40 ° to the beam axis. A depression is preferably formed in the area of the chamber wall in which the fluid flow in question impinges. The depression is advantageously shaped in such a way that the fluid stream directed onto the chamber wall or only a part thereof is deflected inwards into the chamber. If one of the fluid streams contains solid particles or is a gas-particle stream, this fluid stream is preferably introduced into the mixing chamber.

At least one of the fluid streams, preferably only one, is preferably introduced into or on the chamber wall into the mixing chamber. The relevant feed line can run in its end section forming the mouth into the chamber in such a way that the fluid flow introduced through it flows along the chamber wall at which it emerges from the feed line. It is particularly preferred if this feed line opens into a depression in the chamber wall, which becomes flatter continuously in the inflow direction, so that the fluid flow initially entering the depression passes through the course of the depression below an acute angle of preferably at most 50 °, more preferably at most 30 °, to the beam axis in the chamber.

In a preferred embodiment, at least one of the supply lines runs in such a way that the fluid flow entering it into the chamber receives an angular momentum about the beam axis through contact with the chamber wall curved around the beam axis. If this feed line introduces the fluid flow tangentially to the chamber wall into the chamber, its end section forming the mouth has a corresponding inclination to the jet axis projected parallel to the chamber wall. Due to the contact with the chamber wall curved around the jet axis, the fluid flow is already set into a rotational movement about the jet axis. If the fluid flow through the feed line is not introduced tangentially to the chamber wall, the end section of the feed line points in a parallel projection onto the chamber wall inclined to the jet axis which is also projected parallel to the chamber wall. In particular, a fluid stream introduced into the chamber pointing away from the jet axis and / or a fluid stream introduced parallel to the chamber wall in a recess of the chamber wall can be inclined in its parallel projection onto the chamber wall to the jet axis projected parallel to the same chamber wall.

In an advantageous further development, both the first and the second fluid stream are introduced into the mixing chamber in such a way that each of the fluid streams immediately upon introduction, ie. H. when it emerges from the respective feed line, still on the side of the mixing chamber on which its feed line opens, receives an angular momentum about the beam axis through contact with the chamber wall. The angular momentum, which the first fluid flow receives thereby, and the angular momentum, which the second fluid flow receives thereby, can be rectified or opposite to each other.

In a likewise preferred embodiment, at least one, advantageously only one, of the feed lines runs in such a way that the fluid flow introduced through them receives a rotational momentum about the jet axis only when the fluid flows meet. The feed line runs in its end section opening into the mixing chamber in such a way that its fluid flow emerges from the feed line in one direction, which in a parallel projection onto the Chamber wall to which the fluid flow is directed or at which it emerges is parallel to the jet axis.

If one thinks the chamber is divided into two halves by a plane containing the beam axis, the center of gravity of the mouth of the first feed line and the centroid of the mouth of the second feed line are preferably in the same chamber half. Even more preferably, the mouth surfaces of the two supply lines are completely in the same chamber half.

The at least two, preferably exactly two, fluid streams that are mixed and swirled in the mixing chamber are preferably a liquid stream and a gas-particle stream. The particle fraction of the gas-particle stream can in particular be a soda granulate and / or a dolomite granulate or a frozen fluid, for example ice. The gas is preferably air. The liquid flow can also contain particles for surface treatment. In particular, water can form the liquid flow or only its liquid component or a component of a liquid mixture.

An advantageous property of the device according to the invention is that when at least one of the fluid streams is formed as a gas-particle stream, the consumption of particle material can be significantly reduced compared to the known devices. On the one hand, this means a direct cost saving due to the smaller amount of particulate material, and on the other hand, a reduced wear of the particulate material is associated with a further reduction in wear, since wear, especially when using preferably sharp-edged particles, largely originates from these particles. The invention even allows a liquid flow to be dispensed with. The liquid flow mentioned can be replaced by a gas flow or a further gas-particle flow. The device according to the invention has significantly improved dry running properties compared to the prior art. A flow of liquid, which is introduced into the chamber eccentrically or at an angle to the jet axis or preferably both eccentrically and at an angle, can counteract, among other things, the adhesion of particles to the chamber wall become. The liquid flow can thus perform a cleaning function in the chamber.

The first feed line and the second feed line are preferably circular cylindrical in their end sections forming the respective mouth into the mixing chamber. At least the end sections are preferably straight. If one of the supply lines or one of the end sections has a flow cross-section that deviates from the shape of a circular cylinder, the above explanations apply to a line or preferably straight axis which connects the centers of gravity of the cross-sectional areas of the supply line or the relevant end section.

In addition to the device, the invention also relates to a method for treating surfaces, in particular sensitive surfaces, for the execution of which the device is used.

Preferred features of the invention are also described in the subclaims and their combinations, the features described in the claims and those described above complementing one another in an advantageous manner.

An embodiment of the invention is explained below with reference to figures. Features which become apparent from the exemplary embodiment advantageously form the subjects of the claims and the embodiments described above individually and in each combination of features. Show it:

1 shows a device according to the invention for generating a rotating mixture jet with a mixing chamber and a nozzle in a longitudinal section,

Figure 2 shows the mixing chamber opened in the direction of the beam in another longitudinal section and

Figure 3 shows the mixing chamber in a cross section. Figure 1 shows a mixing head of a device for generating a rotating mixture jet for the treatment of surfaces. The device is a handheld device. The mixing head forms a blasting gun.

The mixing head consists of a housing part 2 with a mixing chamber 5 which is open on one side and a housing part 3 which forms a nozzle and is attached to the open side of the mixing chamber 5 and is fastened to the housing part 2 by means of a connecting element 4, in the exemplary embodiment a holding screw , The nozzle consists of three nozzle sections, namely a short cylindrical section which directly adjoins the mixing chamber 5, a central section 8 which continuously narrows from the cylindrical section to a smallest nozzle cross section and a front section 9 which extends from the narrowest Nozzle cross section with a shape and size constant flow cross section extends to the nozzle outlet.

The mixing chamber 5 is delimited on the circumference by a circular cylindrical chamber wall 5a which is rotationally symmetrical with respect to an axis of symmetry R. The nozzle 8, 9 is also rotationally symmetrical to the axis of symmetry R. The chamber wall 5 a is smooth cylindrical with the exception of two depressions 12 and 22.

A first fluid stream, preferably a liquid, particularly preferably water, is introduced with pressure into the mixing chamber 5 through a first feed line 10. A gas-particle mixture is also introduced into the mixing chamber 5 under pressure through a second feed line. The fluid flows are introduced through the feed lines 10 and 20 into the mixing chamber 5 such that they mix there and form a vortex around the axis of symmetry R. The mixture vortex formed in the mixing chamber 5 flows through a mixing chamber outlet 6 into the nozzle 8, 9 and exits at the nozzle outlet in the jet direction V pointing along the axis of symmetry R. The axis of symmetry R is therefore referred to below as the beam axis. Due to its rotational movement generated in the mixing chamber 5, the emerging mixture jet rotates about the jet axis R, so that it spreads in the jet direction and widens conically in the process. If the mixture jet is directed onto a surface to be treated, this results there due to the rotational movement a gentle wiping movement. During the wiping movement, the mixture jet entrains contaminants adhering to the surface. The result is a gentle but thorough cleaning of the surface.

The rotational movement of the mixture jet is generated by the special type of introduction of the fluid flows into the mixing chamber 5. Both fluid streams flow into the mixing chamber 5 under pressure both eccentrically and with an inclination to the jet axis R. The first feed line 10 has an end section 11, which opens into the mixing chamber 5 at its downstream end and is inclined up to its mouth to the jet axis R and whose mouth has an eccentricity to the jet axis R.

In Figure 2, the angle of inclination c <ι, at which the end portion 11 is inclined to the beam axis R, is entered. The angle of inclination αi is measured between the beam axis R and a central axis 12 of the end section 11, the central axis 12 being projected parallel to itself onto the beam axis R.

The feed line 20 also has an end section 21 which opens into the mixing chamber 5 and which is inclined to the beam axis R up to its mouth. An inclination angle α ₂ formed between the beam axis R and a central axis 22 of the end section 21 is measured between the beam axis R and a parallel projection of the axis 22 onto the beam axis R. The fluid flows are introduced into the mixing chamber 5 along the respective central axis 12 and 22. The central axes 12 and 22 form the inflow axes and are also referred to in the following.

The liquid fluid stream introduced through the feed line 10 is introduced without atomization as a fine jet, ie the feed line 10 opens out with the free flow cross section of its end section 11. The gas-particle mixture is introduced through the feed line 20 at a higher pressure than the liquid fluid stream and expands when flowing into the mixing chamber 5, but nevertheless flows in essentially along the inflow axis 22. Figure 3 shows the mixing chamber 5 in the cross section AA shown in Figure 1. The eccentricity ei of the mouth of the first feed line 10 and the eccentricity e _{2 of} the mouth of the second feed line 20 are entered. The eccentricity ej and e ₂ are understood to mean the radial distance between the inflow axes 12 and 22 in the mouth of the respective feed line 10 or 20 from the beam axis R. The sectional planes AA and BB shown in FIGS. 1 and 2 are also entered in FIG.

1 and 2, there is a parallel projection of each of the inflow axes 12 and 22, which is parallel to the beam axis R. 1 shows the relevant parallel projection for the feed line 10 and FIG. 2 for the feed line 20. Of two mutually perpendicular planes which intersect in the beam axis R, one plane contains the projection of the inflow axis 12 parallel to the beam axis R and the other The plane contains the parallel projection of the inflow axis 22 parallel to the beam axis R.

The mouths of the feed lines 10 and 20 are offset from one another in the beam direction V. The first feed line 10 opens downstream of the second feed line 20 into the mixing chamber 5.

The first feed line 10 opens into a recess 13 in the chamber wall 5a. The recess 13 becomes continuously flatter from the mouth of the first feed line 10 along the inflow axis 12 in the inflow direction of the first fluid flow up to the cylindrical chamber wall 5 a. The first fluid flow, which is offset in the end section 12 of the first feed line 10 at a short distance radially outward to the cylindrical inner surface of the chamber wall 5 a and there parallel to a tangent to the cylindrical inner surface and in this sense tangential to the chamber wall 5 a flows through this course of the recess 13 in the plane in which the parallel projection of the inflow axis 12 is parallel to the jet axis R, at a flat angle from the chamber wall 5a away into the mixing chamber 5. Since the inflow axis 12 points tangentially to the chamber wall 5 a and is inclined to the jet axis R, the first fluid stream already receives an angular momentum about the jet axis R as it flows into the mixing chamber 5 and along the chamber wall 5 a The first fluid stream moves spirally about the jet axis R in the jet direction and in the direction of rotation Di shown in FIG. 3.

The second feed line 20 opens out at a rear end of the mixing chamber 5 with respect to the jet direction V. Its inflow axis 22 intersects the chamber wall 5 a at the angle of inclination α ₂ . The fluid flow supplied through the second feed line 20 is thus directed in the parallel projection of FIG. 1, in which the angle of inclination α _{2 is} measured, away from the beam axis R to the region of the chamber wall 5a closest to the mouth of the feed line 20. Accordingly, it is at least partially deflected inwards into the mixing chamber 5.

In the region of the chamber wall 5a, against which the second fluid flow is directed, a further depression 23 is formed. By the second fluid flow at least essentially hitting the closest region of the chamber wall 5a in the recess 23, the deflection effect into the mixing chamber 5 is increased and the deflection angle is increased, in each case compared to a smooth cylindrical chamber wall 5a.

In the exemplary embodiment, the direction of the inflow axis 21 is selected such that the second fluid flow does not receive any angular momentum when it hits the chamber wall 5a. Accordingly, the inflow axis 21 can be projected parallel to a generatrix of the chamber wall 5 a, as the parallelism of the inflow axis 22 and the jet axis R in FIG. 2 shows. Alternatively, however, the inflow axis 22 can also have an inclination to the jet axis R in a plane that is perpendicular to the plane in which its angle of inclination _{2 is} measured. Or, in the exemplary embodiment, the depression 23 running parallel to the beam axis R could have a correspondingly inclined course. If the inflow axis 22 extends in two planes perpendicular to one another in its parallel projection onto the respective plane inclined to the jet axis R, the depression 23 is preferably also formed with a corresponding inclination in the chamber wall 5a. If both fluid flows are already set into a rotary movement about the beam axis R by interaction with the chamber wall 5a, the rotary movements generated in this way can be opposite to one another or have the same direction of rotation. The eccentricity ei and the inclination angle CÜ _{\ of} the inflow axis 12 are greater than the eccentricity e ₂ and the inclination angle α _{2 of} the inflow axis 22. The eccentricity ei essentially corresponds to the chamber radius. The eccentricity e ₂ should be at least as large as half the chamber radius; in the exemplary embodiment it is larger. The angle of inclination αi should be between 5 ° and 70 °, preferably it is chosen from the range between 10 ° and 50 °.

If one thinks the mixing chamber is divided into two chamber halves by a plane containing the axis of rotation R, the mouths of the feed lines 10 and 20 should be formed at least essentially in the same chamber half. Essentially means that at least the larger part of the respective mouth area lies in the same chamber half. In the exemplary embodiment, the two orifices even lie completely in the same chamber half, as can be seen in FIG. 3.

The mixing chamber outlet 6 has a circular cross section and is concentric to the axis of rotation R. Its cross-sectional area is smaller than the cross-sectional area of the mixing chamber 5. In the formation of the outlet 6, a shoulder 7, which delimits the cross-sectional area of the mixing chamber outlet 6, protrudes radially inward around the beam axis R on the front end of the mixing chamber 5 in the beam direction V. The shoulder 7 projects exactly radially from the mixing chamber wall 5a. The shoulder 7 serves as an impact shoulder for the mixture vortex that forms in the mixing chamber 5. It is formed from a wear-resistant insert, for example from a metallic or ceramic sintered ring. The nozzle 8, 9 is preferably lined with a wear-resistant material over its entire length measured along the jet axis R. The shoulder 7 is part of the housing part 3 forming the nozzle 8, 9. The housing part 3 forms the shoulder 7 on its rear joining surface, which in the assembled state is pressed by means of the connecting element 4 against the front end surface of the housing part 2 serving as the mating counter surface.

For the treatment, preferably cleaning, of a surface, the mixing chamber 5 is fed a liquid stream, preferably a water stream, via the feed line 10, and a gas / particle mixture stream, preferably an air / particle stream, via the feed line 20. Mixture stream, each supplied under pressure. The gas-particle mixture flow occurs with the eccentricity e ₂ and at the angle of inclination α ₂ away from the beam axis R in the surface area of the chamber wall 5 a facing the mouth of the feed line 20. A part of the gas-particle mixture flow flows along the chamber wall 5a, a larger part is deflected inwards into the mixing chamber 5 in accordance with the inclination α ₂ . The deflection is reinforced by the recess 23, in which the gas-particle mixture flow essentially meets the chamber wall 5 a. The liquid flow supplied through the first feed line 10 enters the mixing chamber 5 tangentially to the chamber wall 5 a in the region of the depression 13. Due to its inclination oti, the liquid flow is set into a self-rotation about the jet axis R simply by the interaction with the chamber wall 5 a. A part, preferably the larger part, of the liquid flow is deflected inward into the mixing chamber 5 by the depth of the depression 13 decreasing in the direction of flow of the liquid flow. As a result, the eccentricities ei and e ₂ and the course of the feed lines 10 and 20 inclined to the beam axis R, expressed by the angles of inclination c <ι and α ₂ , produce intensive mixing and vortex formation about the beam axis R.

The mixture vortex of the liquid-gas-particle mixture spiraling around the jet axis R in the mixing chamber 5 catches in its part near the chamber wall 5a in the inner edge formed by the shoulder 7, thereby reducing the proportion of the translational energy of the mixture and vice versa the proportion the rotational energy can be increased. The mixture vortex thus generated in the mixing chamber 5 passes through the chamber outlet 6 into the nozzle 8, 9. In the nozzle 8, 9, the vortex movement of the mixture is stabilized. Finally, after flowing through the downstream nozzle section 9, which forms a constant flow cross section, the mixture vortex emerges at the nozzle outlet. The exiting mixture jet spreads conically in the jet direction V with the jet axis R as an axis of symmetry. Due to the rotational movement, it widens approximately conically from the nozzle outlet.

Claims

Expectations

1. Device for generating a fluid jet rotating about a jet axis (R), the device comprising: a) a nozzle (8, 9) through which the jet exits in the direction of the jet axis (R), b) a mixing chamber (5), c) a mixing chamber outlet (6) which connects the mixing chamber (5) to the nozzle (8, 9) and through which the jet axis (R) extends, d) a first feed line (10) through which a first fluid flow into the Mixing chamber (5) can be introduced, e) and a second supply line (20) through which a second fluid flow can be introduced into the mixing chamber (5) and which is eccentric and inclined to the jet axis (R) and the first supply line (10), characterized in that f) the first feed line (10) is inclined or eccentric to the beam axis (R).

2. Device according to claim 1, characterized in that the first feed line (10) is inclined and eccentric to the beam axis (R).

3. Device according to one of the preceding claims, characterized in that the first feed line (10) forms such a flow cross section that a liquid, if the first fluid stream contains one or consists of one alone, is atomized into the mixing chamber (5) becomes.

4. Device according to one of the preceding claims, characterized in that the first feed line (10) extends at least in one end section (11) up to an opening in the mixing chamber (5) tangential to a chamber peripheral wall (5a) of the mixing chamber (5).

5. Device according to one of the preceding claims, characterized in that the first feed line (10) in a recess (13) of a chamber peripheral wall (5 a) of the mixing chamber (5) opens and the first Fludistrom directed against a wall of the recess (13) ,

6. Device according to one of the preceding claims, characterized in that the feed lines (10, 20) in the mixing chamber (5) have end portions (11, 21) from which the fluid flows in the direction of an inflow axis (12, 22) the feed lines (10, 20) emerge so that from at least one of the inflow axes (12, 22) a first parallel projection onto the jet axis (R) spans an inclination plane with the jet axis (R) in which the first parallel projection to the jet axis (R) runs at an angle of inclination (αi, α ₂ ), and that a second parallel projection of the same inflow axis (12, 22) onto the jet axis (R) spans a parallel plane with the jet axis (R) in which the second parallel projection to the jet axis (R ) runs parallel.

7. Device according to one of the preceding claims, characterized in that the feed lines (10, 20) in the mixing chamber (5) have end sections (11, 21), from which the fluid flows each emerge in the direction of an inflow axis (12, 22) that at least one of the inflow axes (12, 22) points in such a direction that the fluid flow emerging from it already sets in a rotational movement about the jet axis (R) by interaction with the chamber peripheral wall (5 a) curved around the jet axis (R) becomes.

8. Device according to one of the preceding claims, characterized in that one of the feed lines (10, 20) at least in an end section (21) opening into the mixing chamber (5) away from the jet axis (R) in the direction of a chamber peripheral wall (5a) The mixing chamber (5) runs, said one of the feed lines (10, 20) preferably opening to the side of the jet axis (R) radially spaced from the jet axis (R) into the mixing chamber (5) and in the direction of the same side located peripheral chamber wall (5a).

9. Device according to the preceding claim, characterized in that the end section (21) extends in the direction of a recess (23) formed in the chamber peripheral wall (5a).

10. Device according to one of the preceding claims, characterized in that in the mixing chamber (5) around the beam axis (R) is formed a shoulder (7) which is downstream of the feed lines (10, 20) from a chamber peripheral wall (5a) the mixing chamber (5) protrudes towards the jet axis (R) and preferably forms an inner edge with the chamber peripheral wall (5a).

11. Device according to one of the preceding claims, characterized in that the nozzle (8, 9) narrows in the flow direction of the fluid streams mixed in the mixing chamber (5) to a narrowest flow cross section and from the narrowest flow cross section to a nozzle outlet a nozzle section ( 9) forms with a constant flow cross-section.

12. The device according to the preceding claim, characterized in that the nozzle (8, 9) narrows conically and the nozzle section (9) forming the constant flow cross section is cylindrical.

13. Device according to one of the preceding claims, characterized in that at least one of the feed lines (10, 20) has a connection for a liquid.

14. The device according to the preceding claim, characterized in that the at least one of the feed lines (10, 20) is connected to a device for supplying the liquid.

15. Device according to one of the two preceding claims, characterized in that the at least one feed line having the connection for the liquid is the first feed line (10).

16. Device according to one of the preceding claims, characterized in that at least one of the feed lines (10, 20) has a connection for compressed gas.

17. Device according to the preceding claim, characterized in that the at least one supply line (20) having the connection for compressed gas is connected to a device for supplying the compressed gas.

18. Device according to one of the preceding claims, characterized in that at least one of the feed lines (10, 20) is connected to a device for supplying solid particles.