Flat jet nozzle assembly

Abstract

The invention relates to a flat jet nozzle assembly comprising a liquid nozzle part (32) and a jet guiding part (12; 82), wherein the liquid nozzle part (32) has a nozzle outlet opening (33) for dispensing a fan-shaped liquid jet (34) which defines a jet plane (36), and the jet guiding part (12; 82) has a through-channel (14) with a liquid receiving section (24) which receives the liquid jet (33) dispensed from the liquid nozzle part (32) and which adjoins a liquid dispensing section (26; 106) which expands on the jet plane (36). The flat jet nozzle assembly (10; 70; 80; 100) has at least one air suction opening (42, 44; 84, 86) which is fluidically connected to the liquid receiving section (24). The aim of the invention is to further develop the flat jet nozzle assembly (10; 70; 80; 100) such that the surrounding air has a reduced negative impact on the liquid jet (34). According to the invention, this is achieved in that the liquid dispensing section (26; 106) has a longitudinal region (27; 107) which extends at least over a part of the total length of the liquid dispensing section and in which the liquid dispensing section (26; 106) constricts perpendicularly to the jet plane (36) as the distance to the liquid receiving section (24) increases.

Description

[0001] FLAT JET NOZZLE ARRANGEMENT

[0002] The invention relates to a flat jet nozzle arrangement with a liquid nozzle part and a jet guide part, wherein the liquid nozzle part has a nozzle outlet opening for dispensing a fan-shaped liquid jet which defines a jet plane, and wherein the jet guide part has a through-channel with a liquid receiving section which receives the liquid jet discharged from the liquid nozzle part and which is adjoined by a liquid discharge section which widens in the jet plane, and wherein the flat jet nozzle arrangement has at least one air intake opening which is in flow connection with the liquid receiving section for introducing air into the liquid receiving section.

[0003] Liquid nozzle parts for dispensing a fan-shaped liquid jet are used, for example, as accessories for high-pressure cleaning devices to cover an object to be cleaned with a fan-shaped liquid jet. The liquid used can be pressurized water, for example. Such liquid nozzle parts are known, for example, from WO 2014 / 090333 A1.

[0004] The fan-shaped liquid jet emerging from the liquid nozzle section interacts with the ambient air on its way to the object to be cleaned. This results in the liquid jet being slowed down and losing its compactness. To counteract this effect, JP 2004-223409 A proposes a flat jet nozzle arrangement of the type mentioned above. In addition to a liquid nozzle section, the flat jet nozzle arrangement has a jet guide section with the aid of which air can be mixed into the liquid jet. The air forms an air jacket that surrounds the liquid jet and can be discharged from the flat jet nozzle arrangement together with the liquid jet. The air jacket reduces the interaction of the liquid jet with the ambient air, particularly reducing the deceleration of the liquid jet and lessening its compactness.

[0005] The jet guide part known from JP 2004-223409 A has a through-channel with a liquid receiving section and a liquid discharge section adjoining it in the flow direction of the liquid jet. The liquid receiving section receives the liquid jet discharged by the liquid nozzle part. The liquid receiving section is followed by the liquid discharge section, which widens in the jet plane so that the fan-shaped liquid jet can flow unhindered through the through-channel of the jet guide part. Air can be supplied to the liquid receiving section via at least one air intake opening, so that a liquid-air mixture forms in the liquid receiving section and the air can then flow through the liquid discharge section together with the liquid jet, forming an air jacket.The air is sucked in by the liquid jet emerging at considerable speed from the nozzle outlet opening of the liquid nozzle part in the manner of a jet pump.

[0006] Using such flat jet nozzle arrangements, the deceleration of the liquid jet due to its interaction with the ambient air can be reduced, thus achieving an improved cleaning effect compared to conventional liquid nozzle components that emit a fan-shaped liquid jet. However, it would be desirable if the influence of the ambient air on the liquid jet could be further reduced.

[0007] The object of the present invention is therefore to further develop a flat jet nozzle arrangement of the generic type such that the ambient air has less of an impact on the liquid jet. This object is achieved according to the invention in a flat jet nozzle arrangement of the type mentioned above in that the liquid dispensing section has a longitudinal region extending over at least part of its total length, in which the liquid dispensing section narrows perpendicular to the jet plane with increasing distance from the liquid receiving section.

[0008] The flat jet nozzle arrangement according to the invention comprises a jet guide part with a liquid dispensing section that widens in the jet plane of the liquid jet with increasing distance from the liquid receiving section and that has a longitudinal region extending at least over part of its total length, in which it narrows perpendicular to the jet plane with increasing distance from the liquid receiving section. The longitudinal region extending at least over part of the total length of the liquid dispensing section, in which the liquid dispensing section narrows perpendicular to the jet plane with increasing distance from the liquid receiving section, counteracts an increase in the cross-sectional area of ​​the liquid dispensing section caused by the widening of the liquid dispensing section in the jet plane.This, in turn, counteracts a reduction in the flow velocity of the air jacket surrounding the liquid jet within the liquid dispensing section. The flow velocity of the air jacket depends on the size of the cross-sectional area of ​​the liquid dispensing section. The more the cross-sectional area increases with increasing distance from the liquid receiving section, the more the flow velocity of the air jacket decreases. By narrowing the liquid dispensing section perpendicular to the jet plane in the longitudinal region extending over at least part of the total length of the liquid dispensing section, an increase in the cross-sectional area caused by the widening of the liquid dispensing section in the jet plane can be at least partially compensated.This, in turn, results in the flow velocity of the air jacket surrounding the liquid jet in the circumferential direction within the liquid dispensing section being less affected. The reduced impact on the flow velocity of the air jacket, in turn, results in the liquid jet being slowed down less within the liquid dispensing section and the compactness of the liquid jet being less affected. When using the flat jet nozzle arrangement according to the invention to clean an object, improved cleaning performance can thus be achieved. The liquid jet can also be further fanned out using the flat jet nozzle arrangement according to the invention, so that a larger cleaning width can be achieved with the same cleaning performance.

[0009] The flat jet nozzle arrangement according to the invention is particularly suitable for use in pressure cleaning devices which provide a cleaning liquid, preferably water, at a pressure of 10 bar to 3,000 bar, in particular 10 bar to 300 bar.

[0010] The longitudinal region of the liquid dispensing section, in which it narrows with increasing distance from the liquid receiving section perpendicular to the jet plane, preferably extends over at least 50% of the total length of the liquid dispensing section, in particular over at least 75%, for example at least 85%.

[0011] It can be provided that the longitudinal region of the liquid dispensing section, in which it narrows with increasing distance from the liquid receiving section perpendicular to the jet plane, is adjoined by an end region of the liquid receiving section which widens with increasing distance from the liquid receiving section perpendicular to the jet plane or remains constant with respect to its extension perpendicular to the jet plane. It is particularly advantageous if the longitudinal region of the liquid dispensing section, in which it narrows with increasing distance from the liquid receiving section perpendicular to the jet plane, extends over the entire length of the liquid dispensing section. In such an embodiment of the invention, the aforementioned longitudinal region extends to the free end of the liquid dispensing section.

[0012] It is advantageous if the size of the cross-sectional area of ​​the liquid dispensing section is constant in the longitudinal region in which the liquid dispensing section narrows perpendicular to the jet plane with increasing distance from the liquid receiving section. With such a configuration of the flat jet nozzle arrangement according to the invention, an increase in the cross-sectional area of ​​the liquid dispensing section, which is caused by its widening in the jet plane, is completely compensated for in the aforementioned longitudinal region by the narrowing perpendicular to the jet plane. The constant size of the cross-sectional area in this longitudinal region of the liquid dispensing section means that the flow velocity of the sucked-in air remains practically constant within this longitudinal region. As a result, flow losses of the liquid jet within the liquid dispensing section can be kept particularly low.

[0013] In a preferred embodiment of the invention, the nozzle outlet opening of the liquid nozzle part opens into the liquid receiving section.

[0014] It is advantageous if the liquid receiving section tapers over its entire length or at least in a partial region extending in the longitudinal direction of the liquid receiving section with increasing distance from the nozzle outlet opening of the liquid nozzle part. With such a configuration, the cross-section of the liquid receiving section decreases at least in a partial region. The liquid receiving section thus forms a channel constriction of the through-channel of the jet guide part. The liquid receiving section is in flow communication with the at least one air intake opening. The channel constriction enhances the intake of air in the manner of a Venturi nozzle.

[0015] Preferably, the liquid receiving section tapers with increasing distance from the nozzle outlet opening perpendicular to the jet plane of the liquid jet. With such a configuration, the extension of the liquid receiving section perpendicular to the jet plane decreases with increasing distance from the nozzle outlet opening of the liquid nozzle part.

[0016] In the jet plane, the liquid absorption section can have a constant extension over its entire length.

[0017] It is advantageous if the fluid intake section tapers continuously with increasing distance from the nozzle outlet. This allows flow losses of the air drawn into the fluid intake section to be kept particularly low.

[0018] In particular, it can be provided that the liquid absorption section tapers continuously over its entire length.

[0019] It is advantageous if the narrowest cross-section of the tapered liquid intake section is positioned at a distance of 3 mm to 30 mm from the nozzle outlet opening. Such positioning of the narrowest cross-section of the liquid intake section allows for particularly effective air intake.

[0020] In an advantageous embodiment of the invention, the longitudinal region of the liquid dispensing section, in which the liquid dispensing section narrows with increasing distance from the liquid receiving section perpendicular to the jet plane, directly adjoins the liquid receiving section, and the size of the cross-sectional area of ​​the liquid dispensing section in this longitudinal region corresponds to the size of the cross-sectional area of ​​the liquid receiving section at its end facing away from the nozzle outlet opening. As already mentioned, it is advantageous if the size of the cross-sectional area of ​​the liquid receiving section decreases with increasing distance from the nozzle outlet opening. In such a configuration, the liquid receiving section has the smallest cross-sectional area at its end facing away from the nozzle outlet opening.The size of this cross-sectional area can then be maintained in the longitudinal region of the liquid discharge section immediately adjacent to the liquid intake section, in that this narrows perpendicular to the jet plane with increasing distance from the liquid intake section and widens in the jet plane.

[0021] It is advantageous if the aforementioned longitudinal region of the liquid discharge section continuously narrows perpendicular to the jet plane with increasing distance from the liquid intake section. This allows flow losses in the air jacket surrounding the liquid jet in the liquid discharge section to be kept particularly low.

[0022] In an advantageous embodiment of the invention, the extent of the liquid dispensing section in the jet plane of the liquid jet is limited by a first and a second channel wall of the through-channel, and the extent of the liquid dispensing section perpendicular to the jet plane of the liquid jet is limited by a third and a fourth channel wall of the through-channel, wherein the distance between the first and the second channel wall continuously increases with increasing distance from the liquid receiving section and the distance between the third and the fourth channel wall in the aforementioned longitudinal region of the liquid dispensing section continuously decreases with increasing distance from the liquid receiving section.

[0023] It is advantageous if the first channel wall and the second channel wall are designed to be straight or curved. The first channel wall and the second channel wall define the opening angle of the liquid discharge section in the jet plane. The opening angle is preferably 10° to 60°, in particular 20° to 40°.

[0024] Preferably, the third channel wall and the fourth channel wall are designed to be straight or curved in the aforementioned longitudinal region of the liquid dispensing section.

[0025] In an advantageous embodiment of the invention, the passage channel of the jet guide part has an inlet section located directly upstream of the liquid receiving section, in which the liquid nozzle part is arranged. The inlet section thus forms a receiving space for the liquid nozzle part.

[0026] It is advantageous if the nozzle outlet opening of the liquid nozzle part is arranged directly in the transition region between the inlet section and the liquid receiving section with respect to the flow direction of the liquid jet, so that the liquid jet emitted by the liquid nozzle part flows directly into the liquid receiving section.

[0027] Within the inlet section, in an advantageous embodiment of the invention, the liquid nozzle part is at least partially surrounded in the circumferential direction by at least one intermediate space, which extends to the liquid receiving section and is in flow communication with the at least one air intake opening. Air can be supplied to the liquid receiving section via the intermediate space, which can be mixed with the liquid jet, forming an air jacket that surrounds the liquid jet in the circumferential direction.

[0028] The liquid nozzle part is advantageously held on a stirring piece for supplying pressurized liquid, wherein the pipe section is held on a holding part of the flat jet nozzle arrangement that is detachably connectable to the jet guide part. The pipe section can be, for example, a jet pipe of a high-pressure cleaning device, via which liquid pressurized by the high-pressure cleaning device can be supplied to the liquid nozzle part. The stirring piece is advantageously held on the holding part, which is detachably connectable to the jet guide part.

[0029] The holding part can, for example, form a holding plate of the flat jet nozzle arrangement, which can be fixed to a rear side of the jet guide part and has a passage through which the pipe section passes and on which the pipe section is held, for example by forming a positive connection.

[0030] The at least one air intake opening of the flat jet nozzle arrangement according to the invention is preferably arranged on the holding part. The holding part can have at least one passage that forms an air intake opening and is adjoined, for example, by the previously explained intermediate space that at least partially surrounds the liquid nozzle part in the circumferential direction.

[0031] In an advantageous embodiment of the invention, the at least one air intake opening is arranged on the jet guide part. In such a configuration, the jet guide part not only has a through-channel but also at least one air intake opening that is in flow communication with the liquid receiving section of the through-channel, so that air can be sucked in and mixed with the liquid jet.

[0032] The at least one air intake opening is advantageously in flow connection with the liquid intake section via an air intake channel.

[0033] To minimize air flow losses, it is advantageous if the flow cross-sections of the air intake opening and the air intake duct are at least as large as the smallest cross-sectional area of ​​the liquid intake section. The jet guide part preferably has two opposing air intake openings, each of which is connected to an air intake duct.

[0034] The air intake ducts are preferably aligned obliquely to the jet plane and designed mirror-symmetrically to the jet plane.

[0035] As already mentioned, it is advantageous if the flat jet nozzle arrangement is configured to dispense liquid at a pressure of 10 bar to 3,000 bar, in particular at a pressure of 10 to 300 bar. Such a design of the flat jet nozzle arrangement is particularly suitable as an accessory for pressure cleaning devices.

[0036] The opening angle of the liquid discharge section widening in the jet plane is advantageously 10° to 60°, in particular 20° to 40°.

[0037] It is particularly advantageous if the contours of the liquid intake section and the liquid suction section downstream of the liquid nozzle section are designed to be continuous and tangentially continuous, and to merge into one another in a continuous and tangentially continuous manner. This allows flow losses of the sucked-in air and the liquid jet to be kept particularly low.

[0038] The flat jet nozzle arrangement is preferably designed for flow rates of pressurized liquid in the range between 0.1 m 3 / h to

[0039] 3 m 3 / h, especially between 0.15 m 3 / h and 1.3 m 3 / h. This design is particularly suitable for pressure cleaning devices.

[0040] The size of the nozzle outlet opening is preferably 0.25 mm 2 up to 5 mm 2 , especially 0.5 mm 2 up to 2.5 mm 2 . The smallest cross-sectional area of ​​the advantageously tapered liquid receiving section is preferably at least 10 times the nozzle outlet opening.

[0041] The size of the at least one air intake opening is preferably at least 10 times the size of the nozzle outlet opening.

[0042] The following description of advantageous embodiments of the invention serves to explain it in more detail in conjunction with the drawings. They show:

[0043] Figure 1: a sectional view of a first embodiment of a flat jet nozzle arrangement perpendicular to the jet plane of a liquid jet;

[0044] Figure 2: a sectional view of the flat jet nozzle arrangement from Figure 1 in the jet plane;

[0045] Figure 3: a sectional view of the flat jet nozzle arrangement taken along line 3-3 in Figure 1;

[0046] Figure 4: a sectional view of the flat jet nozzle arrangement taken along line 4-4 in Figure 1;

[0047] Figure 5: a side view of the flat jet nozzle arrangement in the direction of arrow A in Figure 1;

[0048] Figure 6: a side view corresponding to Figure 5 of an alternative embodiment of the flat jet nozzle arrangement from Figure 1;

[0049] Figure 7: a sectional view of a second embodiment of a flat jet nozzle arrangement perpendicular to a jet plane of a liquid jet; Figure 8: a sectional view of the flat jet nozzle arrangement from Figure 7 in the jet plane;

[0050] Figure 9: a sectional view of a third embodiment of a flat jet nozzle arrangement perpendicular to a jet plane of a liquid jet;

[0051] Figure 10: a sectional view of the flat jet nozzle arrangement from Figure 8 in the jet plane;

[0052] Figure 11: a sectional view of the flat jet nozzle arrangement along the line 11-11 in Figure 9;

[0053] Figure 12: a sectional view of the flat jet nozzle arrangement taken along line 12-12 in Figure 9;

[0054] Figure 13: a side view of the flat jet nozzle arrangement in the direction of arrow B in Figure 9;

[0055] Figure 14: a sectional view of a fourth embodiment of a flat jet nozzle arrangement perpendicular to the jet plane of a liquid jet;

[0056] Figure 15: a sectional view of the flat jet nozzle arrangement from Figure 14 in the jet plane;

[0057] In Figures 1 to 5, a first advantageous embodiment of a flat jet nozzle arrangement according to the invention is shown schematically and is designated overall by the reference numeral 10.

[0058] The flat jet nozzle assembly 10 has a jet guide part 12 through which a through-channel 14 extends, extending from a rear side 16 of the jet guide part 12 to a front side 18. A holding element is arranged on the rear side 16, which in the illustrated embodiment is designed as a holding plate 20.

[0059] The through-channel 14 forms an inlet section 22 extending from the rear side 16, which is directly adjoined by a liquid intake section 24. Directly adjoining the liquid intake section 24 is a liquid discharge section 26, which extends to the front side 18 of the jet guide part 12. The inlet section 22 has a rectangular cross-section, as is particularly evident in Figure 3.

[0060] The holding plate 20 has a passage opening 28 through which a pipe section 30 extends, which extends into the inlet section 22 of the jet guide part 12 and which carries a liquid nozzle part 32 at its end extending into the inlet section 22. Pressurized liquid, in particular pressurized water, can be supplied to the liquid nozzle part 32 via the pipe section 30. This pressurized liquid, in particular pressurized water, can be discharged from the liquid nozzle part 32 via a nozzle outlet opening 33 in the form of a fan-shaped liquid jet 34, which defines a jet plane 36.

[0061] As is clear from Figures 1 and 2, in the illustrated embodiment, the liquid intake section 24 tapers continuously over its entire length with increasing distance from the inlet section 22 perpendicular to the jet plane 36. The liquid output section 26, which adjoins the liquid intake section 24 continuously and tangentially, widens in the jet plane 36 with increasing distance from the liquid intake section 24, whereas it continuously narrows over its entire length perpendicular to the jet plane 36 with increasing distance from the liquid intake section 24. The liquid output section 26 therefore has a longitudinal region 27 which extends over the entire length of the liquid output section 26 and in which the liquid output section 26 continuously narrows perpendicular to the jet plane with increasing distance from the liquid intake section 24.The continuous widening in the jet plane 36 and the continuous narrowing perpendicular to the jet plane 36 ensure that, although the shape of the cross-sectional area of ​​the liquid dispensing section 26 continuously changes with increasing distance from the liquid receiving section 24, the size of the cross-sectional area of ​​the liquid dispensing section 26 remains constant over its entire length. The size of the cross-sectional area of ​​the liquid dispensing section 26 is identical to the size of the smallest cross-sectional area of ​​the liquid receiving section 24, which continuously tapers perpendicular to the jet plane 36 of the liquid jet 34.

[0062] As is clear from Figures 1 and 2, the channel walls 23, 25 delimiting the liquid receiving section 24 perpendicular to the jet plane 36 are curved in an arc shape in the direction of the jet plane 36, whereas the channel walls 29, 31 delimiting the liquid receiving section 24 in the jet plane 36 are designed to be straight.

[0063] The pipe section 30 is fixed in the passage opening 28, wherein the passage opening 28 has two opposite opening sections 38, 40 which adjoin opposite side regions of the pipe section 30 and each form an air intake opening 42, 44 of the flat jet nozzle arrangement 10.

[0064] The liquid nozzle part 32 is surrounded within the inlet section 22 in the circumferential direction by two semi-annular spaces 46, 48, which adjoin the opening sections 38, 40 of the holding plate 20 and extend to the liquid receiving section 24.

[0065] Within the liquid intake section 24, a negative pressure is created under the effect of the liquid jet 34, so that air is sucked into the liquid intake section 24 via the air intake openings 42, 44 and the intermediate spaces 46, 48 and mixed with the liquid jet 34. This creates an air jacket that surrounds the liquid jet 34 in the circumferential direction. The flow velocity of the air jacket remains practically constant within the liquid discharge section 26 because the size of the cross-sectional area of ​​the liquid discharge section 26 remains constant over its entire length. Although the liquid discharge section 26 expands in the jet plane 36, the associated increase in the cross-sectional area is compensated for by the narrowing of the liquid discharge section 26 perpendicular to the jet plane 36.The practically constant flow velocity of the air jacket has the consequence that flow losses of the liquid jet 34 within the liquid discharge section 26 can be kept low, in particular the deceleration of the liquid jet 34 within the liquid receiving section 24 can be kept low and the compactness of the liquid jet 34 is only slightly impaired.

[0066] The liquid dispensing section 26 is delimited in the jet plane 36 by a first channel wall 50 and a second channel wall 52, and perpendicular to the jet plane 36, the liquid receiving section 24 is delimited by a third channel wall 54 and a fourth channel wall 56 of the through-channel 14. The distance between the first channel wall 50 and the second channel wall 52 increases with increasing distance from the liquid receiving section 24, whereas the distance between the third channel wall 54 and the fourth channel wall 56 continuously decreases with increasing distance from the liquid receiving section 24. This is particularly evident from Figures 1 and 2.

[0067] The channel walls 50, 52, 54 and 56 are each designed to be straight in the embodiment shown in Figures 1 to 5.

[0068] Figure 6 shows an alternative embodiment of the retaining plate 20 in the form of a retaining plate designated overall by reference numeral 60. The retaining plate 60 differs from the retaining plate 20 in that, in addition to a central passage opening 62, it has two passage slots 64, 66. The central passage opening 62 is arranged between the two passage slots 64, 66 and accommodates the stirring piece 30 in a form-fitting manner.

[0069] The passage slots 64, 66 each form an air intake opening through which sucked-in air can reach the gaps 46, 48 already explained above, so that the air in the liquid receiving section 24, as already explained above, can be mixed with the liquid jet 34 to form an air jacket surrounding the liquid jet 34 in the circumferential direction.

[0070] Figures 7 and 8 schematically illustrate a second advantageous embodiment of a flat jet nozzle arrangement according to the invention and are designated overall by reference numeral 70. The flat jet nozzle arrangement 70 is largely identical in design to the flat jet nozzle arrangement 10 described above with reference to Figures 1 to 5. Therefore, the same reference numerals are used in Figures 7 and 8 for identical components as in Figures 1 to 5, and to avoid repetition, reference is made to the above explanations with regard to these components.

[0071] The flat jet nozzle arrangement 70 differs from the flat jet nozzle arrangement 10 in that the channel walls 50 and 52, which delimit the liquid discharge section 26 in the jet plane 36, are curved in an arc shape.

[0072] Figures 9 to 13 schematically illustrate a third advantageous embodiment of a flat jet nozzle arrangement according to the invention, which is designated overall by the reference numeral 80. The flat jet nozzle arrangement 80 is largely identical in design to the flat jet nozzle arrangement 10 explained above with reference to Figures 1 to 5. Therefore, the same reference numerals are used in Figures 9 to 13 for identical components as in Figures 1 to 5, and with regard to these components, reference is made to the above explanations to avoid repetition.

[0073] The flat jet nozzle arrangement 80 has a jet guide part 82, which has an air intake opening 84, 86 on each side of the jet plane 36, to which an air intake channel 88, 90 adjoins in the direction of the liquid intake section 24. The air intake channels 88, 90 are aligned obliquely to the jet plane 36 and are designed mirror-symmetrically to the jet plane 36. Air can be sucked into the liquid intake section 24 via the air intake openings 84, 86 and the air intake channels 88, 90, whereby the air is subject to only very minimal flow losses due to the inclined position of the air intake channels 88, 90.

[0074] As is particularly clear from the sectional view in Figure 11, the air intake ducts 88, 90 are essentially slot-shaped.

[0075] The flat jet nozzle arrangement 80 has a holding plate 92 which, in contrast to the holding plates 20 and 60 explained above, does not have an air intake opening but merely serves to hold the pipe section 30 which passes through a central passage opening 94 in a form-fitting manner.

[0076] In the flat jet nozzle arrangement 80, the first and second channel walls 50, 52, which delimit the liquid discharge section 26 in the jet plane 36, are also curved, whereas the channel walls 54, 56, which delimit the liquid discharge section 26 perpendicular to the jet plane 36, are straight.

[0077] Figures 14 and 15 schematically illustrate a fourth advantageous embodiment of a flat jet nozzle arrangement according to the invention, which is designated overall by the reference numeral 100. The flat jet nozzle arrangement 100 is largely identical in design to the flat jet nozzle arrangement 10 explained above with reference to Figures 1 to 5. Therefore, the same reference numerals are used in Figures 14 and 15 for identical components as in Figures 1 to 5, and with regard to these components, reference is made to the above explanations to avoid repetition.

[0078] The flat jet nozzle arrangements 10, 70 and 80 explained above each have a liquid dispensing section 26 with a longitudinal region 27 which extends over the entire length of the liquid dispensing section 26, starting from the liquid receiving section 24, to the free end of the liquid dispensing section 26 and in which the liquid dispensing section 26 narrows continuously with increasing distance from the liquid receiving section 24 perpendicular to the jet plane 36.In contrast, the flat jet nozzle arrangement 100 has a jet guide part 102 with a liquid dispensing section 106, which has a longitudinal region 107 that extends only over part of the total length of the liquid dispensing section 106 and to which an end region 110 of the liquid dispensing section 106 adjoins. The liquid dispensing section 106 continuously narrows in the longitudinal region 107 with increasing distance from the liquid receiving section 24 perpendicular to the jet plane 36 and continuously widens in the end region 110 with increasing distance from the liquid receiving section 24. The widening end region 110 counteracts the formation of droplets at the free end of the liquid dispensing section 106.

[0079] Using the flat jet nozzle arrangements 10, 70, 80, and 100, a very compact, fan-shaped liquid jet can be formed, which is subject to only minimal flow losses within the jet guide section, so that the flow velocity of the liquid jet is only slightly reduced. This allows the resulting liquid jet to achieve a very effective cleaning effect when directed at an object to be cleaned.

Claims

P A T E N T A N S P R Ü C H E 1. Flat jet nozzle arrangement with a liquid nozzle part (32) and a jet guide part (12; 82; 102), wherein the liquid nozzle part (32) has a nozzle outlet opening (33) for dispensing a fan-shaped liquid jet (34) which defines a jet plane (36), and wherein the jet guide part (12; 82; 102) has a through-channel (14) with a liquid receiving section (24) which receives the liquid jet (343) dispensed by the liquid nozzle part (32) and which is adjoined by a liquid discharge section (26; 106) which widens in the jet plane (36), and wherein the flat jet nozzle arrangement (10; 70; 80; 100) has at least one air intake opening (42, 44; 84, 86) which is connected to the Liquid receiving section (24) is in flow connection for introducing air into the liquid receiving section (24), characterized in that the liquid discharge section (26;106) has a longitudinal region (27; 107) extending at least over part of its total length, in which the liquid dispensing section (26; 106) narrows perpendicular to the jet plane (36) with increasing distance from the liquid receiving section (24); 2. Flat jet nozzle arrangement according to claim 1, characterized in that said longitudinal region (27; 107) of the liquid dispensing section (26; 106) extends over at least 50% of the total length of the liquid dispensing section (26; 106), in particular over at least 75%, for example at least 85%.

3. Flat jet nozzle arrangement according to claim 1 or 2, characterized in that at the said longitudinal region (107) of the liquid dispensing section (106) there is a adjoining the liquid receiving section (24) is an end region (110) of the liquid dispensing section (106) which widens perpendicularly to the jet plane (36) of the liquid jet (34) or remains constant with respect to its extension perpendicular to the jet plane (36).

4. Flat jet nozzle arrangement according to claim 1 or 2, characterized in that said longitudinal region (27) of the liquid dispensing section (26) extends over the entire length of the liquid dispensing section (26).

5. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the size of the cross-sectional area of ​​the liquid dispensing section (26; 106) is constant in said longitudinal region (27; 107).

6. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the nozzle outlet opening (33) opens into the liquid receiving section (24).

7. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the liquid receiving section (24) tapers over its entire length or at least in a partial area extending in the longitudinal direction of the liquid receiving section (24) with increasing distance from the nozzle outlet opening (33) of the liquid nozzle part (32).

8. Flat jet nozzle arrangement according to claim 7, characterized in that the liquid receiving section (24) tapers with increasing distance from the nozzle outlet opening (33) perpendicular to the jet plane (36) of the liquid jet (34).

9. Flat jet nozzle arrangement according to claim 7 or 8, characterized in that the liquid receiving section (24) tapers continuously with increasing distance from the nozzle outlet opening (33).

10. Flat jet nozzle arrangement according to claim 7, 8 or 9, characterized in that the narrowest cross section of the liquid receiving section (24) is arranged at a distance of 3 mm to 30 mm from the nozzle outlet opening (33).

11. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the said longitudinal region (27; 107) of the liquid dispensing section (26; 106) directly adjoins the liquid receiving section (24) and the size of the cross-sectional area of ​​the liquid dispensing section (26; 106) in the said longitudinal region (27; 107) corresponds to the size of the cross-sectional area of ​​the liquid receiving section (24) which the latter has at its end facing away from the nozzle outlet opening (33).

12. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the said longitudinal region (27; 107) of the liquid dispensing section (26; 106) narrows continuously with increasing distance from the liquid receiving section (24) perpendicular to the jet plane (36) of the liquid jet (34).

13. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the extent of the liquid dispensing section (26; 106) in the jet plane (36) of the liquid jet (34) is limited by a first and a second channel wall (50, 52), and that the extent of the liquid dispensing section (26) perpendicular to the jet plane (36) of the liquid jet (34) is limited by a third and a fourth channel wall (54, 56) wherein the distance between the first and second channel walls (50, 52) increases continuously with increasing distance from the liquid receiving section (24) and the distance between the third and fourth channel walls (54, 56) in said longitudinal region (27; 107) of the liquid dispensing section (26; 106) decreases continuously with increasing distance from the liquid receiving section (24).

14. Flat jet nozzle arrangement according to claim 13, characterized in that the first channel wall (50) and the second channel wall (52) are designed to be straight or curved.

15. Flat jet nozzle arrangement according to claim 13 or 14, characterized in that the third channel wall (54) and the fourth channel wall (56) are designed to be straight or curved in the said longitudinal region (27; 107) of the liquid dispensing section (26; 106).

16. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the through-channel (14) has an inlet section (22) immediately upstream of the liquid receiving section (24), in which the liquid nozzle part (32) is arranged.

17. Flat jet nozzle arrangement according to claim 16, characterized in that the liquid nozzle part (32) within the inlet section (22) is at least partially surrounded in the circumferential direction by at least one intermediate space (46, 48) which extends to the liquid receiving section (24) and is in flow connection with the at least one air intake opening (42, 44).

18. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the liquid nozzle part (32) is a pipe section (30) is held for supplying pressurized liquid, wherein the stirring piece (30) is held on a holding part (20; 92) of the flat jet nozzle arrangement (10) which can be detachably connected to the jet guide part (12; 82).

19. Flat jet nozzle arrangement according to claim 18, characterized in that the at least one air intake opening (42, 44) is arranged on the holding part (20).

20. Flat jet nozzle arrangement according to one of claims 1 to 18, characterized in that the at least one air intake opening (84, 86) is arranged on the jet guide part (82).

21. Flat jet nozzle arrangement according to claim 20, characterized in that the at least one air intake opening (84, 86) is in flow connection with the liquid receiving section (24) via an air intake channel (88, 90).

22. Flat jet nozzle arrangement according to claim 21, characterized in that the jet guide part (82) has two opposite air intake openings (84, 86), each of which is connected to an air intake duct (88, 90).

23. Flat jet nozzle arrangement according to claim 22, characterized in that the air intake channels (88, 90) are aligned obliquely to the jet plane (36) and are designed mirror-symmetrically to the jet plane (36).

24. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the flat jet nozzle arrangement (10; 70; 80; 100) is designed to dispense liquid under a pressure of 10 bar to 3,000 bar, in particular under a pressure of 10 bar to 300 bar.

25. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the opening angle of the liquid dispensing section (26; 106) widening in the jet plane (36) of the liquid jet (34) is 10° to 60°, in particular 20° to 40°.

26. Flat jet nozzle arrangement according to one of the preceding claims, characterized in that the contours of the liquid receiving section (24) and the liquid dispensing section (26; 106) downstream of the liquid nozzle part (32) are designed to be continuous and tangentially continuous and merge into one another in a continuous and tangentially continuous manner.

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