Cleaning nozzle, kit, use of a cleaning nozzle, method for producing a rotational body and method for retrofitting a compressed-air line

Abstract

The invention relates to a cleaning nozzle (1) suitable for use with compressed air and comprising a housing (2) and a rotational body (3) which can be driven in rotation in the housing by an air volume flow and is therefore rotatably mounted about an axis of rotation (11), the rotational body (3) having at least one helical fluid channel (4).

Description

[0001] Cleaning nozzle, set, use of a cleaning nozzle, method for producing a rotating body and method for retrofitting a compressed air line

[0002] The invention relates to a cleaning nozzle comprising a housing and a rotating body rotatably mounted in the housing, which can be set in rotation by means of a fluid flow.

[0003] Such cleaning nozzles for generating a rotating fluid jet are already known in principle. However, existing solutions are often not suitable for use with compressed air, but rather are designed specifically for cleaning with water. However, the use of water is particularly unsuitable in production halls, for example, for machining workpieces.

[0004] Other cleaning nozzles rely on an additional turbine which drives the rotating body so that it rotates about a rotational axis. These cleaning nozzles therefore have a more complex structure comprising several components. As a rule, such cleaning nozzles therefore have a drive function unit and a separate cleaning function unit. In such a design, it can preferably be the case that fluid channels in the drive function unit do not lead to an outlet side of the rotating nozzle and therefore do not perform a cleaning function. In addition, for such cleaning nozzles to operate correctly, the fluid must generate sufficient pressure. The required operating pressure can therefore be quite high, which means that the energy required and the wear and tear occurring on a compressor, for example, are uneconomically high.

[0005] Existing cleaning systems that operate solely on compressed air are also known. However, these are generally limited to simply constructed compressed air guns designed to generate a single, non-rotating jet of compressed air. Especially in confined work spaces or in hard-to-reach areas of a machine, cleaning with existing solutions is often difficult or relatively complex, since redirecting the fluid jet can only be achieved by moving the compressed air gun itself. In confined spaces, however, this can often be difficult, or hard-to-reach areas are not cleaned sufficiently.

[0006] Due to the fact that compressed air systems are often already in place and are often permanently installed in production facilities and workshops, a sustainable solution would be desirable that does not require the complete replacement of existing systems or the installation of new parallel systems for cleaning.

[0007] The task is therefore to provide an improved cleaning option for surfaces that eliminates the disadvantages mentioned above.

[0008] The solution to this problem is achieved by the subject matter according to claim 1.

[0009] In particular, to achieve the above-mentioned object, a cleaning nozzle of the type mentioned at the outset is proposed, which is characterized in that the rotating body has at least one spiral-shaped fluid channel. The spiral-shaped course of the at least one fluid channel makes it possible to transmit a rotational force to the rotating body, so that the latter can be set in rotation due to the fluid flow through the rotating body. An advantage of this embodiment is that even a low driving force of the fluid, in particular a low fluid pressure and / or a low fluid suction, is sufficient to drive the rotating body sufficiently quickly. This enables improved cleaning of a surface, for example by blowing off or sucking up chips or other contaminants located on the surface to be cleaned.The rotating volume flow generated by the cleaning nozzle enables thorough removal of stubborn dirt, impurities and deposits.

[0010] Due to the rotating movement, the jet covers a larger area and ensures even cleaning. The cleaning nozzle also enables time savings during cleaning steps and thus increases productivity. The increased cleaning efficiency and the larger area coverage lead to faster cleaning, which reduces time and effort. It also improves energy efficiency. The cleaning nozzle with rotating body according to the invention is more energy efficient than conventional cleaning nozzles because it rotates

[0011] Effect produces an improved cleaning jet and consumes less energy.

[0012] The cleaning nozzle's functionality is based on a swirl effect that the at least one spiral-shaped fluid channel experiences due to the flowing medium. This swirl effect is transferred to the rotating body and causes it to rotate.

[0013] Advantageous embodiments are described below which, alone or in combination with one or more advantageous embodiments, can further develop the subject matter according to claim 1.

[0014] According to an advantageous embodiment, the

[0015] The rotating body can have at least two fluid channels. In particular, the rotating body can have three or more fluid channels. Multiple fluid volume flows can be generated simultaneously by multiple fluid channels. This allows even better cleaning of a surface to be achieved. The two, three or more fluid channels can each be spiral-shaped. A space- and material-saving design can provide for the fluid channels to overlap in different planes along the longitudinal direction of the rotating body.

[0016] According to a further advantageous embodiment, the at least one fluid channel can run from an inflow side to an outlet side of the rotary body, wherein an outlet angle of the fluid channel on the outlet side is aligned obliquely to a longitudinal direction of the rotary body and / or wherein an outlet point is arranged off-center. Due to the oblique outlet angle of the fluid volume flow from the outlet side, it is possible for a larger area to be better reached by the generated fluid volume flow. Thus, the cleaning result of a surface to be cleaned can be further improved. The above-mentioned terms refer to operation with overpressure (hereinafter also referred to as overpressure operation). In the case of operation of the cleaning nozzle with negative pressure (negative pressure operation), this is not a

[0017] Not an outlet side, but an inlet side. Accordingly, in this case, it is not an outlet angle, but an inlet angle, since the flow direction through the cleaning nozzle is reversed. The terms "inlet side" and "outlet side" therefore also refer to overpressure operation of the cleaning nozzle and would be reversed in the case of underpressure operation.

[0018] According to a further advantageous embodiment, the outlet angles of the multiple fluid channels can be designed identically. This enables particularly uniform cleaning of the surface. The sum of the fluid volume flows can generate a type of multi-part, rotating cleaning stream, which allows for the largest possible area and far-reaching cleaning of a surface. In other words, a cone or truncated cone is stretched between the rotating fluid volume flows.

[0019] In order to achieve rotation of the rotating body in a particularly efficient manner, it can be provided that the outlet points of the fluid channels on the outlet side of the rotating body are arranged at equal distances from one another in the direction of rotation, preferably so that all outlet points of the fluid channels are arranged at equal distances from one another or at least some of the outlet points of the fluid channels are arranged at equal distances from one another. Alternatively, it can be provided that the outlet points of the fluid channels on the outlet side of the rotating body are arranged at least partially at unequal distances from one another in the direction of rotation.

[0020] According to a further advantageous embodiment, the rotating body can be designed as a drive and cleaning function unit. In particular, this can be provided in such a way that the fluid that can be passed through the at least one fluid channel serves to set the rotating body in a rotating state and at the same time to clean a surface. This enables a particularly simple construction of the cleaning nozzle. In particular, the rotating nozzle can be designed in two parts consisting of a housing and the rotating body. The described construction also has the advantage that lower forces, in particular pressure forces (overpressure) and / or suction forces (negative pressure), are required to set the rotating body in rotation. This can, for example, considerably reduce the wear on a compressor since this can be operated at a lower power while the cleaning nozzle is in use.

[0021] According to a further advantageous embodiment, the rotating body can be formed in one piece, in particular monolithically. This particularly simple design allows for cost-effective production. Furthermore, this design is sustainable, as improved recycling of a decommissioned cleaning nozzle is possible, since the rotating body is not manufactured as a composite material.

[0022] According to an advantageous embodiment, the rotating body can have at least two fluid channels, the outlet points of which are arranged radially offset from one another with respect to a rotational axis of the rotating body. This allows a larger area to be exposed to and cleaned by a total volume flow generated by the cleaning nozzle.

[0023] According to an advantageous embodiment, a bearing region of the rotating body can be located within the housing outside a fluid flow region. Thus, the bearing region does not adversely affect the flow behavior of the fluid. Provision can be made for the rotating body to be mounted in the housing by an axial bearing or a radial bearing. The use of a rolling bearing is particularly advantageous, since this allows particularly high speeds to be achieved and therefore the cleaning efficiency can be further improved. Furthermore, provision can be made for a shaft bearing to be provided for mounting the rotating body.

[0024] In order to better avoid any adverse effects on the flow behavior of the fluid, the housing can widen in its cross-sectional diameter from an inflow side to an outflow side. As already mentioned, this is an explanation of the cleaning nozzle in overpressure operation. In vacuum operation the flow direction would be correspondingly reversed. However, the advantages mentioned apply regardless of the flow direction of the fluid. This design of the cleaning nozzle can create additional installation space, for example to arrange a radial bearing to support the rotating body without having to divert the fluid volume flow. Alternatively, it can be provided that the housing remains the same in its cross-sectional diameter from an inflow side to an outflow side and is preferably cylindrical.

[0025] To achieve improved fluid flow through the rotating body, the rotating body may be provided with an impact surface on the inflow side that is inclined to the longitudinal direction. It may be particularly advantageous if the rotating body has a tip on the inflow side. This prevents the fluid volume flow from impacting the rotating body perpendicularly on the inlet side, creating an improved flow pattern for the fluid volume flow.

[0026] According to a particularly advantageous embodiment, the rotating body can be designed such that it can be set in rotation by both a compressive force and a suction force (negative pressure). This means that flow can be carried through the at least one fluid channel in both directions. The cleaning nozzle can therefore be operated, for example, with compressed air and / or with an air suction, as generated by a vacuum cleaner. When operated with a vacuum cleaner, the at least one fluid channel can also be provided in addition to transporting away the sucked-up dirt particles. In order to be able to cover an even larger area simultaneously using the cleaning nozzle, it can be provided that the cleaning nozzle, in addition to the at least one spiral-shaped fluid channel, has at least one fluid channel of a second type of fluid channel with a different course and / or exit angle.The second type of fluid channel can, for example, be used to generate a fluid jet running in the longitudinal direction, i.e. along the axis of rotation or parallel thereto, in particular a central focus jet.

[0027] According to an advantageous embodiment, the rotating body can be designed so that it can be removed from the housing without destruction. Alternatively or additionally, an installation direction of the rotating body within the housing can be changed. This makes it possible for an installation position of the rotating body to be adapted to a changeable flow direction through the housing of the cleaning nozzle. Thus, in certain embodiments of the cleaning nozzle in which the rotating body has a fixed inlet side and a fixed outlet side for the fluid, the rotating body can be removed and rearranged within the housing in the correct orientation, adapted to the flow direction.

[0028] To easily connect the cleaning nozzle to existing fluid lines, such as a compressed air gun and / or a vacuum cleaner, the housing can have a coupling point by means of which the cleaning nozzle can be coupled to a fluid line, preferably to a compressed air gun or a vacuum cleaner. For example, said coupling point can be designed as a thread and / or a snap-in connection.

[0029] According to an advantageous embodiment of the cleaning nozzle, it can be provided that at least one third of a complete turn of the at least one spiral-shaped fluid channel is formed inside the rotating body, in particular inside a cylindrical section of the rotating body. This has the advantage that a fluid flow present during operation can set the rotating body in rotation sufficiently quickly to achieve a good cleaning result. Tests have shown that if the total length in the axial direction (corresponds to the pitch S) of a complete turn of the spiral-shaped fluid channel exceeds three times the length (L) of the fluid channel in the axial direction of the rotating body, reliable rotation can no longer be achieved. In other words, the ratio of the length of the fluid channel in the axial extent to the pitch of a complete turn is approximately 1:3.

[0030] According to a further advantageous embodiment of the cleaning nozzle, a complete turn of the at least one spiral-shaped fluid channel can be formed within the rotating body, in particular within a cylindrical section of the rotating body. Compared to the previously described embodiment, the ratio of the length of the fluid channel in axial extension to the pitch of a complete turn is approximately 1:1. This has the advantage that a particularly high torque can be generated to drive the rotating body.

[0031] Several designs are conceivable with a ratio of the length of the fluid channel in axial extension to the pitch of a complete turn between 1:3 and 1:1, which lead to useful solutions according to the invention.

[0032] According to a further development of the cleaning nozzle, an exit angle, for example the exit angle already mentioned, of the at least one fluid channel on the exit side relative to a longitudinal direction of the rotating body, in particular relative to a center line of the rotating body, can have a value of approximately 22 degrees to approximately 47 degrees. Smaller exit angles, closer to 22 degrees, are better suited for the focused cleaning of surfaces. Larger angles, such as around 47 degrees, are particularly suitable for generating a higher rotation of the rotating body.

[0033] According to a further development, the at least one fluid channel can be closed except for an inflow opening and an outflow opening. This allows for a particularly high degree of efficiency, since the fluid flow can be optimally used for both propulsion and cleaning.

[0034] According to an advantageous embodiment, with which the efficiency can also be improved, it can be provided that a clear cross-sectional area of ​​the at least one fluid channel is constant over the entire length of the fluid channel within the rotary body.

[0035] According to a further development, it can be provided that the at least one fluid channel and / or the at least one fluid channel of a second type has a round and / or a non-round cross-section, preferably an oval or elliptical cross-section. A non-round configuration can be particularly advantageous if the installation space is limited in the radial direction of the rotating body. In these cases, a non-round cross-sectional shape can possibly have a larger clear cross-section than a round one if the radial extent of the rotating body is to remain unchanged.

[0036] According to an advantageous embodiment, the

[0037] The rotating body may have a retaining structure on its outer circumference. In particular, this may be designed as a circumferential rib. In the position of use, the retaining structure may interact with a suitable counter-retaining structure of the housing and / or a bearing to prevent the rotating body from being blown out of the housing. The counter-retaining structure thus forms a contact surface for the retaining structure, so that the rotating body is axially secured but can still rotate about its own longitudinal axis.

[0038] To be able to open the housing, for example, to remove or replace the rotating body and / or the bearing, the housing can have a cover that is designed to be reversibly removable from another housing part forming a receiving space. The cover can be provided with a thread that can be screwed or is screwed to a matching mating thread on the other housing part.

[0039] To enable optimal rotation of the rotating body within the housing, a further development may provide for a cover, for example the aforementioned cover, of the housing to have a spacer structure on an inner side. This spacer structure may be configured such that a distance exists between a bearing, such as the aforementioned bearing, and a closed surface of the cover in the position of use. According to an advantageous embodiment, the spacer structure may be configured as a circumferential spacer rib.

[0040] To enable a user to detach the cover from the other housing part particularly easily, the cover of the housing can have an engagement surface on an outer side, in particular in the circumferential direction. This can preferably be designed such that the engagement surface can be used to open the housing by hand and / or with a tool. To enable the cleaning nozzle to be connected particularly firmly and securely, for example to a compressed air gun, the housing can have, at least in sections, a non-circular cross-section forming a tool engagement surface. The housing can preferably have a hexagonal cross-sectional contour.

[0041] In order to better prevent damage to the cleaning nozzle due to improper use, such as being thrown down, the housing can have at least one reinforcing rib to locally reinforce a wall of the housing.

[0042] According to an advantageous further development, a bearing, for example the bearing already mentioned above, for the rotatable mounting of the rotary body can be arranged completely within the housing, wherein this is preferably arranged in a non-destructively removable manner.

[0043] It can be particularly advantageous if the bearing is designed to be open in such a way that the rolling elements, in particular the balls, of the bearing are located within the fluid flow area, so that they are surrounded by the fluid flowing through them during operation of the cleaning nozzle. This has the advantage that a radial expansion of the cleaning nozzle can be designed in a more space-saving manner.

[0044] According to a further development of the cleaning nozzle, the cleaning nozzle can have at least one spiral-shaped fluid channel and at least one further fluid channel of a second type, wherein the fluid channels are separate from one another and serve to convey different fluids and / or fluid mixtures. The cleaning result can thus be improved even further. According to an advantageous embodiment of the cleaning nozzle, the at least one fluid channel of the second type can be connectable to a liquid reservoir, wherein during use of the cleaning nozzle, liquid can be sucked in from the liquid reservoir by generating a negative pressure within the at least one fluid channel of the second type (refers to overpressure operation). It is therefore possible, in addition to, for example, a compressed air stream, to generate an atomization of a liquid in a fluid stream of the second type.

[0045] According to a further development, the rotating body can have a conical section on the inflow side to form the impact surface, wherein an inflow opening of the at least one spiral-shaped fluid channel and / or an inflow opening of a fluid channel of a second type are located within the conical section. It has been shown that this allows the efficiency of the cleaning nozzle to be further improved.

[0046] According to an advantageous embodiment, the rotating body, particularly on the outlet side, can have at least one cleaning agent that rotates along with the rotating body. For example, the cleaning agent can comprise bristles and / or lamellae. This enables direct, gentle contact with the surface to be cleaned, allowing for more effective removal of stubborn dirt.

[0047] The invention further relates to a set comprising a cleaning nozzle, as described and / or claimed herein, and a compressed air gun, wherein the cleaning nozzle is or can be connected to a corresponding counter-coupling point of the compressed air gun by means of a coupling point, for example the one already mentioned. According to an advantageous embodiment, it can be provided that a pressure reducer is used in a fluid guide section, in particular wherein the pressure reducer allows a maximum pressure of 6 bar or less than 6 bar, preferably between 3 and 6 bar, preferably of 3 bar. In this way, energy consumption and / or wear of a volume flow generator, such as a compressor, can be reduced.

[0048] The invention further relates to a set comprising a cleaning nozzle, as described and / or claimed herein, with two different rotating bodies. The advantage can be that, as already described above, different rotating bodies can be used in one housing, with an openable design of the housing simplifying their replacement. Thus, the set allows the cleaning nozzle to be used for different purposes.

[0049] According to a further development, the set can comprise at least one rotating body with at least one cleaning agent and one rotating body without cleaning agent.

[0050] According to a further development, the set can comprise at least two rotational bodies with different pitches of their spiral-shaped fluid channels.

[0051] The invention additionally relates to the use of a cleaning nozzle, as described and / or claimed herein, and / or a set, as described and / or claimed herein, for cleaning a surface with compressed air. Cleaning using compressed air, particularly in enclosed spaces, has the advantage that residue-free cleaning is possible. When water is used as a fluid, moisture is introduced, which can cause damage, particularly in enclosed spaces or to electrical machines. Alternatively, cleaning can also be carried out by applying a vacuum, i.e. by sucking up the dirt particles through the cleaning nozzle.

[0052] The invention further relates to a method for producing a rotating body of a cleaning nozzle, as described and / or claimed herein, by additive manufacturing, preferably using a powder bed process. The material used can be, for example, the plastic polyamide 12 (PA12) and / or a metal. Polyamide 12 offers good mechanical properties, high strength and sufficient resistance to wear and chemicals. The production of a rotating body with several, in particular overlapping fluid channels would not be possible or would be uneconomical using other manufacturing techniques. Such geometries can therefore only be produced with a support of an intermediate product of the rotating body.

[0053] The invention also relates to a method for retrofitting a compressed air line with a cleaning nozzle as described and / or claimed herein and / or a set as described and / or claimed herein, which is characterized in that an outlet point of a compressed air line is connected to a compressed air gun and a cleaning nozzle connected thereto.

[0054] Preferably, the cleaning nozzle is not suitable for use with a liquid, especially water. In order to generate a stable and efficient rotational movement without additional drive units, it can further be provided that the cleaning nozzle is designed without a swirl chamber, turbine, and / or rotor.

[0055] It can also be provided that the cleaning nozzle is manufactured additively as a complete assembly. This allows for cost-effective production and easy maintenance and repair.

[0056] The invention will now be described in more detail with reference to several exemplary embodiments, but is not limited to these exemplary embodiments. Further exemplary embodiments result from the combination of the features of one or more claims with one another and / or with one or more features of the exemplary embodiments.

[0057] It shows:

[0058] Fig. 1-3 a first embodiment of a cleaning nozzle according to the invention, in which the rotating body is mounted within the housing by means of a radial bearing (in particular by means of a rolling bearing),

[0059] Fig. 4-6 a second embodiment of a cleaning nozzle according to the invention, in which the rotating body is mounted within the housing by means of an axial bearing (in particular by means of a shaft bearing),

[0060] Fig. 7+8 a schematic representation of a possible design of a rotary body as a one-piece, monolithic component, wherein the courses of the individual spiral-shaped fluid channels within the rotary body are shown by dashed lines, Fig. 9-12 a further embodiment of a cleaning nozzle according to the invention, which essentially corresponds to the cleaning nozzle from Figs. 1-3, differing in the different coupling point for connecting to a fluid line,

[0061] Fig. 13-16 show a further embodiment of a cleaning nozzle according to the invention, which essentially corresponds to the cleaning nozzle from Figs. 1-3, wherein in addition a supply line connectable to a liquid reservoir is inserted into the central fluid line, wherein liquid can be supplied by generating a negative pressure by a compressor or the like,

[0062] Fig. 17 a) an embodiment of a rotation body in which a ratio of L to S is 1:1,

[0063] Fig. 17 b) an embodiment of a rotation body in which a ratio of L to S is 1:3,

[0064] Fig. 18 a)+b) two designs of rotating bodies with different pitches of the turns of the spiral fluid channels, which also changes the exit angle of the fluid channels on the downstream side,

[0065] Fig. 19 a) -d) four embodiments of rotary bodies with different fluid channel designs, wherein a) a rotary body with three spiral fluid channels with a round cross-section, b) a rotary body with three spiral fluid channels with an oval cross-section, c) a rotary body with three spiral fluid channels with an oval cross-section and a central fluid channel of a second type with a round cross-section, and d) a rotary body with three spiral fluid channels with a round cross-section and a central fluid channel of a second type with a round cross-section.

[0066] In Figs. 1-3, 4-6, 9-12 and 13-19, several embodiments of a cleaning nozzle according to the invention are shown, wherein the cleaning nozzle as a whole is designated as 1 in each case.

[0067] Each variant of the rotary nozzle 1 comprises a housing 2 and a rotating body 3 mounted and held therein. The cleaning nozzle 1 is explained below with reference to compressed air operation. The flow direction and the designation of the components are therefore designed accordingly, whereby the flow direction would be reversed in the case of operation with vacuum / negative pressure (suction).

[0068] In Figs. 7 and 8, a variant of such a

[0069] Rotation body 3 is shown.

[0070] In the embodiments shown in Figs. 1-12, the rotating body 3 has three fluid channels 4 each, which extend spirally from an inflow side 5 of the rotating body 3 to an outlet side 6, at which the fluid channels 4 exit the rotating body 3. There is no direct connection between the fluid channels 4.

[0071] The outlet side 6 is therefore also located on the downstream side 16 of the cleaning nozzle 1.

[0072] As explained with reference to Fig. 8, the fluid channels 4 each have an outlet point 9 on the outlet side 6. An outlet angle 7 is in each case aligned such that it is oriented obliquely outwards to a longitudinal direction 8 of the rotating body 3, i.e. in particular at least partially inclined in the radial direction. As a result, during use of the cleaning nozzle 1, a fluid flow is formed for each fluid channel 4 which is at least partially directed outwards with respect to a rotational axis 11 of the rotating body 3. In the exemplary embodiments shown, therefore, there are three independent fluid flows.

[0073] The outlet point 9 of at least one fluid channel 4 is arranged off-center. In the illustrated embodiments, all fluid channels are arranged off-center.

[0074] An entry point of the fluid into the at least one fluid channel 4 is arranged offset from the exit point 9 of the same fluid channel 4 in the direction of rotation 10 of the rotating body 3.

[0075] The inlet and / or outlet points 9 of the fluid channels 4 are arranged at equal distances from one another in the direction of rotation 10. This results in a rotationally symmetrical structure of the rotating body 3.

[0076] The rotating body 3 is designed here as a drive and cleaning function unit. This means that the fluid channels running through the rotating body 3 have a dual function. On the one hand, they serve to set the rotating body in rotation as a fluid flows through it. On the other hand, the same fluid flows used for drive are also discharged from the rotating body in such a way that a cleaning jet can be generated, which can be used to clean a surface.

[0077] The rotating body 3 shown in Figs. 7 and 8 is made in one piece from a single material, so that it can also be described as monolithic. The production of such a rotating body 3 with such a material- and space-saving structure can advantageously be achieved by 3D printing (additive manufacturing). Otherwise, the intertwined design of multiple fluid channels would not be feasible.

[0078] The embodiments of the cleaning nozzle 1 shown in Figs. 1-3 and 8-12 each have a bearing 26 designed as a radial bearing 15 for rotatably supporting the rotating body 3 within the housing 2. The radial bearing 15 is formed in a bearing region 12 of the housing 2, which lies outside a fluid flow region 13 and therefore does not impede the flow of the fluid.

[0079] As can be seen in Figs. 2 and 11, the housing 2 is designed such that its cross-sectional diameter expands from the inflow side 5 to the outflow side 16 of the cleaning nozzle 1. This allows space to be created for the insertion of the aforementioned radial bearing 15 in order to keep the fluid flow area 13 clear, in particular in order not to restrict the clear cross-section of the fluid flow area 13.

[0080] In contrast, the embodiment shown in Figs. 4-6 has an axial bearing 14 as bearing 26 for rotatably supporting the rotating body 3 within the housing 2. The advantage of this design is that the housing can be made narrower and is therefore easier to position in the available installation space under certain conditions.

[0081] In order to improve the introduction of the fluid into the individual fluid channels, the rotating body 3 has an impact surface 17 on the inflow side 5 that is inclined to the longitudinal direction 8 of the rotating body 3. As shown in Figs. 2, 8 and 11, the impact surface 17 can be designed as a tip on the inflow side. In addition, a funnel enclosing the impact surface 17 can be formed on the inflow side 5 of the rotating body 3, through which funnel the fluid flow can be better introduced into the individual fluid channels.

[0082] The cleaning nozzle 1 is designed in such a way that the rotating body can be set in rotation with both a pressure force and a suction force (negative pressure).

[0083] The housing 2 of the cleaning nozzle 1 comprises at least one coupling point 8 for connecting the cleaning nozzle 1 to a suitable counter-coupling point of a fluid line and / or a compressed air gun and / or a vacuum cleaner. As can be seen from Figs. 1-12, various configurations are possible for the formation of the coupling point 8, such as a collar, thread, or snap-in connection.

[0084] In Figs. 13-16 a further embodiment is shown which has essentially the same features as the previously described embodiments.

[0085] In addition to the spiral-shaped fluid channels 14 (first type), this embodiment also includes a different, rectilinear fluid channel of the second type 19. The fluid channel 19 serves to form a central, rectilinear focus jet which, unlike the other fluid jets, does not rotate due to its central position. This further facilitates cleaning because the focus jet can be used in a more targeted manner. Optionally, a line 36 can be inserted into the fluid channel of the second type 19, the free end of which lies within the rotating body 3. This makes it possible, by means of the negative pressure that develops within the housing 2 and / or within the rotating body 3 during use of the cleaning nozzle 1, to suck in liquid via the line 36 from a liquid reservoir that is connectable or connected to the line 36 and to expel it via an outflow opening 22 of the fluid channel of the second type 19, preferably mixed with air.For example, a nebulization of the liquid can be created in this way, which is ejected as a spray from the cleaning nozzle 1.

[0086] Figs. 17-18 show different rotational bodies 3 with different pitches 39 of the complete turns 20 of the spiral-shaped channels 4. The pitch 39 influences the exit angle 7, as can be seen from Figs. 18 a) and b). The lower the pitch 39, the larger the exit angle 7.

[0087] 17 a) and b) show boundary regions of the pitches 39 of complete turns 20 in relation to the length of the fluid channels 4 in the longitudinal extension of the rotary body 3. Fig. 17 a) shows an exemplary embodiment of a rotary body 3 whose length L, 23 of the spiral-shaped fluid channel 4 in the axial direction corresponds approximately to a pitch 39 of the selected complete turn 20 (pitch S = length L of the fluid channel 4). This results in a very large exit angle 7 of approximately 47 degrees, as can be seen in the associated Fig. 18 a). 17 b) shows an exemplary embodiment of a rotary body 3 whose length L, 23 of the spiral-shaped fluid channel 4 in the axial direction corresponds to approximately one third of a pitch 39 of the selected complete turn 20 (pitch S = 3 x length L of the fluid channel 4). This results in a very small exit angle 7 of approx.22 degrees. The exit angle 7 refers here to the angle between the longitudinal direction and / or rotation axis 11 and the outflow direction of the generated fluid flow.

[0088] The fluid channels 4, 19 of the rotating body 3 are completely closed with the exception of an inflow opening 21 and an outflow opening 22, whereby a clear cross-sectional area remains constant along the channel course.

[0089] In Fig. 19 a) -d) different rotation bodies 3 are shown, which differ in the number of fluid channels 4, 19 and their cross-sectional shape.

[0090] The rotating body 3 comprises a retaining structure 24 designed as a circumferential rib, which rotatably rests against a counter-retaining structure 25, serving as a contact surface, of the bearing 26 inserted into the housing 2. The bearing 26 (together with the rotating body 3) is in turn held in the housing 2 by the cover 27 placed on the housing part 28. The housing 2 comprises a screw connection by means of which the cover 27 can be reversibly removed from the housing part 28, so that the bearing 26 and the rotating body 3 can be removed.

[0091] The cover 27 has, on an inner side facing the bearing 26, a spacer structure 31 which, in the present example, is designed as a circumferential rib and which, in the position of use, comes into contact with a non-rotating support region of the bearing 26. This creates a sufficient distance between a closed cover region and a rotating part of the bearing 26 to provide sufficient free space for unrestricted rotation. A friction-increasing engagement surface 32 is formed on the cover 27 to make it easier to unscrew the cover 27 from the housing part 28. The housing 2 also comprises a tool engagement surface 33 which, here, is designed as a hexagon, in order to be able to establish a better connection via the coupling point 18 with the aid of a suitable tool, for example using an air gun or the like.The invention thus relates in particular to a cleaning nozzle 1 suitable for use with compressed air, comprising a housing 2 and a rotary body 3 which can be set in rotation in the housing 2 by an air volume flow and is therefore rotatably mounted about a rotation axis 11, wherein the rotary body 3 has at least one helical fluid channel 4.

[0092] List of reference symbols

[0093] 1 cleaning nozzle

[0094] 2 housings

[0095] 3 rotation bodies

[0096] 4 fluid channel

[0097] 5 Inflow side (in overpressure operation)

[0098] 6 Outlet side (in overpressure operation)

[0099] 7 Exit angle (in overpressure operation)

[0100] 8 Longitudinal direction

[0101] 9 Exit point (in overpressure operation)

[0102] 10 Circulation direction

[0103] 11 Rotation axis

[0104] 12 Storage area

[0105] 13 Fluid flow area

[0106] 14 thrust bearings

[0107] 15 radial bearings

[0108] 16 Downstream side

[0109] 17 Impact surface

[0110] 18 coupling point

[0111] 19 Fluid channel of the second type

[0112] 20 turns

[0113] 21 Inlet opening

[0114] 22 Outlet opening

[0115] 23 Length of the fluid channel (L)

[0116] 24 Retaining structure

[0117] 25 Counter-retaining structure

[0118] 26 warehouses

[0119] 27 lids

[0120] 28 Housing part

[0121] 29 thread on the lid

[0122] 30 counter thread on the housing part

[0123] 31 Distance structure

[0124] 32 Attack surface on the lid

[0125] 33 Tool contact surface 34 Reinforcing rib

[0126] 35 rolling elements

[0127] 36 Line to the liquid reservoir

[0128] 37 Conical section 38 Cylindrical section

[0129] 39 Pitch of the winding (S)

Claims

Claims 1. Cleaning nozzle (1), in particular for use with compressed air, comprising a housing (2) and a rotary body (3) rotatably mounted in the housing (2), which can be set in rotation by means of a fluid flow, characterized in that the rotary body (3) has at least one spiral-shaped fluid channel (4).

2. Cleaning nozzle (1) according to claim 1, characterized in that the rotating body (3) has at least two spiral-shaped fluid channels (4) 3. Cleaning nozzle (1) according to claim 1 or 2, characterized in that the rotating body (3) has three or more spiral-shaped fluid channels (4).

4. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the at least one spiral-shaped fluid channel (4) runs in an overpressure operation from an inflow side (5) to an outlet side (6) of the rotary body (3), wherein an outlet angle (7) of the at least one fluid channel (4) on the outlet side (6) is aligned obliquely to a longitudinal direction (8) of the rotary body (3) and / or wherein an outlet point (9) is arranged off-center.

5. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the outlet angles (7) of the plurality of spiral-shaped fluid channels (4) are of the same design and / or that the outlet points (9) of the fluid channels (4) on the outlet side (6) are arranged at equal distances from one another in the direction of rotation (10).

6. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the rotary body (3) is designed as a drive and cleaning function unit, in particular such that the fluid which can be passed through the at least one fluid channel (4) serves to put the rotary body (3) into a rotating state and at the same time to clean a surface.

7. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the rotating body (3) is formed in one piece, in particular monolithic.

8. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the rotating body (3) has at least two fluid channels (4), the outlet points (9) of which are arranged radially offset from one another with respect to a rotation axis (11) of the rotating body (3).

9. Cleaning nozzle (1) according to one of the preceding claims, characterized in that a bearing region (12) of the rotary body (3) lies within the housing (2) outside a fluid flow region (13).

10. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the housing (2) widens in its cross-sectional diameter from an inflow side (5) to an outflow side (16) or that the housing (2) remains the same in its cross-sectional diameter from an inflow side (5) to an outflow side (16).

11. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the rotary body (3), in particular during overpressure operation, is Inflow side (5) has an impact surface (17) inclined to the longitudinal direction (8), preferably that the rotating body (3) has a tip on the inflow side (5).

12. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the rotating body (3) is designed such that it can be set in rotation both with overpressure and with negative pressure.

13. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the cleaning nozzle (1) has, in addition to the at least one spiral-shaped fluid channel (4), at least one fluid channel of a second type (19) of fluid channel with a different course and / or exit angle.

14. Cleaning nozzle (1) according to claim 13, characterized in that the fluid channel of the second type (19) is designed to generate a fluid jet running straight in the longitudinal direction, in particular to generate a central focus jet.

15. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the rotating body (3) is designed to be removable from the housing (2) and / or that an installation direction of the rotating body (3) within the housing (2) is variable.

16. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the housing (2) has a coupling point (18) by means of which the cleaning nozzle (1) can be coupled to a fluid line, preferably to a compressed air gun or a vacuum cleaner.

17. Cleaning nozzle according to claim 16, characterized in that the coupling point (18) is designed as a thread or a locking connection is formed.

18. Cleaning nozzle (1) according to one of the preceding claims, characterized in that at least one third of a complete turn (20) of the at least one spiral-shaped fluid channel (4) is formed within the rotating body (3), in particular within a cylindrical section (38) of the rotating body (3).

19. Cleaning nozzle (1) according to one of the preceding claims, characterized in that a maximum of one complete turn (20) of the at least one spiral-shaped fluid channel (4) is formed within the rotating body (3), in particular within a cylindrical section (38) of the rotating body (3).

20. Cleaning nozzle (1) according to one of the preceding claims, characterized in that one or the outlet angle (7) of the at least one fluid channel (4) on the outlet side (6) relative to a longitudinal direction (8) of the rotating body (3), in particular relative to a center line of the rotating body (3), is a value of 22 degrees to 47 degrees.

21. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the at least one fluid channel (4) with the exception of an inflow opening (21) and a Outlet opening (22) is closed.

22. Cleaning nozzle (1) according to one of the preceding claims, characterized in that a clear cross-sectional area of ​​the at least one fluid channel (4) is constant over the entire length (23) of the fluid channel (4) within the rotating body (3).

23. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the at least one Fluid channel (4) and / or the at least one fluid channel of the second type (19) has a round and / or a non-round cross-section, preferably an oval or elliptical cross-section.

24. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the rotary body (3) has a retaining structure (24) on the outer circumference, in particular a retaining structure (24) designed as a circumferential rib, which interacts with a counter-retaining structure (25) of the housing (2) and / or a bearing (26) in order to prevent the rotary body (3) from being blown out of the housing (2).

25. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the housing (2) has a cover (27) which is designed to be reversibly removable from another housing part (28) forming a receiving space.

26. Cleaning nozzle according to claim 25, characterized in that the cover (27) has a thread (29) which can be screwed or is screwed to a matching counter-thread (30) on the other housing part (28).

27. Cleaning nozzle (1) according to one of the preceding claims, characterized in that one or the cover (27) of the housing (2) has a spacer structure (31) on an inner side, in particular such that a distance exists between a bearing (26) and a closed surface of the cover (27) in the position of use.

28. Cleaning nozzle according to claim 27, characterized in that the spacer structure (31) is designed as a circumferential spacer rib.

29. Cleaning nozzle (1) according to one of the preceding claims, characterized in that one or the cover (27) of the housing (2) is arranged on an outer side, in particular in Direction of rotation, an engagement surface (32), preferably wherein opening of the housing (2) is facilitated by hand and / or with a tool via the engagement surface (32).

30. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the housing (2) has at least in sections a non-circular cross-section forming a tool engagement surface (33), preferably a hexagonal cross-section.

31. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the housing (2) has at least one reinforcing rib (34) in order to locally reinforce a wall of the housing (2).

32. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the cleaning nozzle (1) has a bearing (26) for rotatably supporting the rotary body (3), which bearing is arranged completely within the housing (2), preferably arranged so as to be removable without destruction.

33. Cleaning nozzle (1) according to one of the preceding claims, characterized in that one or the bearing (26) is designed to be open in such a way that the rolling elements (35) of the bearing (26) lie within the fluid flow region (13), so that they are flowed around by fluid flowing through them during operation of the cleaning nozzle (1).

34. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the cleaning nozzle (1) has at least one spiral-shaped fluid channel (4) and at least one further fluid channel of a second type (19), wherein the fluid channels (4, 19) are separate from one another and serve to convey different fluids and / or fluid mixtures.

35. Cleaning nozzle (1) according to one of the preceding claims, characterized in that one or the at least one fluid channel of the second type (19) is connectable to a liquid reservoir, wherein during use of the cleaning nozzle (1) liquid can be sucked in from the liquid reservoir by generating a negative pressure within the at least one fluid channel of the second type (19).

36. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the rotary body (3) has a conical section (37) on the inflow side for forming the impact surface (17), wherein an inflow opening (21) of the at least one spiral-shaped fluid channel (4) and / or an inflow opening (21) of a fluid channel of a second type (19) are located within the conical section (37).

37. Cleaning nozzle (1) according to one of the preceding claims, characterized in that the rotating body (3) has at least one cleaning agent rotating together with the rotating body (3).

38. Set comprising a cleaning nozzle (1) according to one of the preceding claims and a compressed air gun, wherein the cleaning nozzle (1) is connectable or connected by means of the coupling point (18) to a corresponding counter-coupling point of the compressed air gun.

39. Set according to claim 38, characterized in that in a A pressure reducer is used in the fluid guide section, in particular wherein the pressure reducer allows a maximum pressure of 6 bar or less than 6 bar, preferably between 3 and 6 bar, preferably of 3 bar.

40. Set comprising a cleaning nozzle (1) according to one of the preceding claims with two different rotating bodies (3).

41. Set according to claim 40, characterized by a rotating body (3) with at least one cleaning agent and a rotating body (3) without cleaning agent.

42. Set according to claim 40 or 41, characterized by at least two rotating bodies (3) with different pitches (39) of their spiral-shaped fluid channels (4).

43. Use of a cleaning nozzle (1) according to one of the preceding claims and / or a set according to one of the preceding claims for cleaning a surface with compressed air and / or a combination of compressed air and a liquid.

44. Method for producing a rotary body (3) of a cleaning nozzle (1) according to one of the preceding claims by additive manufacturing, preferably by means of a powder bed process, preferably wherein the plastic PA12 or a metal is used as the material. 45 Method for retrofitting a compressed air line with a cleaning nozzle (1) according to one of the preceding claims and / or a set according to one of the preceding claims, characterized in that an outlet point of a Compressed air line is connected to a compressed air gun and a cleaning nozzle (1) connected to it.

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