Output device for outputting a liquid jet surrounded by an air flow

Abstract

The invention relates to an output device for outputting a liquid jet surrounded by an air flow and expanding in a fan shape in a jet plane, the output device comprising: a jet generating apparatus (11) having a jet tube (18), which carries a flat jet nozzle (26) on a first end portion (18); and an air enveloping apparatus (12), which has a passage channel (46) having a first channel portion (48) for receiving the liquid jet (14) and a second channel portion (50) for outputting the liquid jet (54) and an air flow surrounding the liquid jet, wherein the first channel portion (48) is fluidically connected to at least one air intake opening (52, 54) and the second channel portion (50) extends up to an outlet opening (46) and expands in a fan shape in the jet plane (50), and wherein the air enveloping apparatus (12) comprises a housing (20) having a first housing part (41) and a second housing part (42), wherein the first end portion (18) of the jet tube (16) enters the housing. In order to develop the output device in such a way that it can be installed more cost-effectively, it is proposed that the air enveloping apparatus (12) comprises an intermediate part (44) which, in combination with the first housing part (41), forms the passage channel (46), wherein the intermediate part (44) and the first end portion (18) of the jet tube (16) are clamped between the first housing part (41) and the second housing part (42), wherein the passage channel (46) is oriented in the jet plane (13).

Description

[0001] A 501 204 c

[0002] Dispensing device for dispensing a jet of liquid surrounded by an airflow

[0003] The invention relates to a dispensing device for dispensing a liquid jet surrounded by an airflow in a fan-like manner in a jet plane, comprising a jet generation device for generating the liquid jet and an air-enveloping device for enveloping the liquid jet with an airflow, wherein the jet generation device has a jet tube which carries a flat jet nozzle at a first end section, and wherein the air-enveloping device has a through-channel with a first channel section for receiving the liquid jet and with a second channel section for dispensing the liquid jet and the airflow surrounding it, wherein the first channel section is in flow communication with at least one air intake opening of the dispensing device and the second channel section extends to an outlet opening and expands in a fan-like manner in the jet plane.and wherein the air-enclosing device comprises a housing with a first housing part and a second housing part, wherein the first end section of the jet tube is immersed in the housing.

[0004] Spray lances with an end section fitted with a flat jet nozzle for emitting a fan-shaped jet of liquid are used as accessories for pressure cleaning equipment, particularly high-pressure cleaners, to sweep a fanned-out jet of liquid over an object to be cleaned. The flat jet nozzle can be integrated into the end section of the spray lance. Pressurized water, for example, can be used as the liquid. Flat jet nozzles of this type are known from WO 2014 / 090333 A 501 204 c

[0005] - 2 -

[0006] The fan-shaped jet of liquid exiting the flat jet nozzle interacts with the ambient air on its way to the object being cleaned. This causes the jet to slow down and lose its compactness, thus impairing the cleaning effect. To counteract this effect, JP 2004-223409 A proposes a dispensing device that, in addition to a jet generation device in the form of a supply pipe carrying a flat jet nozzle at its free end, employs an air enveloping device to surround the liquid jet with an airflow. The supply pipe is welded to a mounting plate, which in turn is bolted to the air enveloping device. The air enveloping device has a housing with a through-channel that extends across the housing.The flow channel has a first channel section for receiving the liquid jet supplied by the jet generator and a second channel section for discharging the liquid jet and the surrounding airflow. The first channel section is connected to two air intake openings. The second channel section extends to an outlet opening of the flow channel and widens in a fan shape in the jet plane of the liquid jet. Under the influence of the liquid jet exiting the flat jet nozzle, air is drawn into the flow channel through the air intake openings, forming an air jacket that envelops the liquid jet and can be discharged together with the liquid jet through the outlet opening. This reduces the interaction of the liquid jet with the ambient air.

[0007] In the dispensing device known from JP 2004-223409 A, the air-enclosing device has a housing into which the free end of the supply pipe, to which the flat jet nozzle is attached, is immersed. The housing is formed by a first housing part and a second housing part, which are welded together. The manufacture and assembly of the known dispensing device involves considerable costs. During assembly, careful attention must be paid to ensuring that the second channel section of A 501 204 c

[0008] - 3 -

[0009] The channel is oriented in such a way that the fan-shaped liquid jet emanating from the flat jet nozzle can flow through the second channel section practically unimpeded.

[0010] The object of the present invention is therefore to design an output device of the generic type in such a way that it can be mounted more cost-effectively.

[0011] This problem is solved according to the invention in a dispensing device of the type mentioned at the outset by the fact that the air-enclosing device has an intermediate part which, in combination with the first housing part, forms the passage channel, wherein the intermediate part and the first end section of the jet tube are clamped between the first housing part and the second housing part, wherein the passage channel is aligned in the jet plane of the liquid jet.

[0012] In the dispensing device according to the invention, the air-enclosing device comprises, in addition to a first housing part and a second housing part, an intermediate part which, like the first end section of the jet tube carrying the flat jet nozzle, is clamped between the first and second housing parts. The intermediate part, in combination with the first housing part, forms the passage channel which, when the intermediate part and the first end section of the jet tube are clamped between the two housing parts, assumes an alignment in the jet plane of the liquid jet. Thus, when assembling the dispensing device, it is only necessary to clamp the intermediate part and the first end section of the jet tube between the two housing parts.

[0013] The two housing parts, the intermediate part and the first end section of the jet tube are designed and configured to align the intermediate part and the first end section of the jet tube when clamped between the housing parts in such a way that the intermediate part in combination with the A 501 204 c

[0014] - 4 - The passage channel formed by the first housing part is aligned in the jet plane of the liquid jet. By clamping the first end section of the jet tube between the two housing parts, the first housing part, in particular, assumes a predetermined orientation relative to the first end section of the jet tube and consequently also relative to the flat jet nozzle fixed at the first end section. By clamping the intermediate part between the two housing parts, the intermediate part also assumes a predetermined orientation relative to the first housing part. The predetermined orientation of the intermediate part is such that the passage channel formed by the intermediate part and the first housing part is aligned in the jet plane of the liquid jet emanating from the flat jet nozzle.This results in the fan-shaped liquid jet emanating from the flat jet nozzle being able to flow through the passage channel, and in particular through the fan-shaped second channel section of the passage channel, virtually unimpeded. The dispensing device according to the invention can therefore be installed cost-effectively.

[0015] It is advantageous if the first housing part can be screwed to the second housing part by means of connecting screws, wherein the second housing part has screw bosses into which a connecting screw can each be screwed, and wherein the intermediate part and the first end section of the jet tube that extends into the housing have several retaining elements, each of which can be placed onto a screw boss, and wherein the first housing part has support elements that can be placed onto the retaining elements, the connecting screws extending through the support elements and retaining elements with clearance. In such an embodiment of the dispensing device according to the invention, the intermediate part and the first end section of the jet tube that extends into the housing have several retaining elements, each of which can be placed onto a screw boss of the second housing part during assembly of the dispensing device.The first housing part has support elements, each of which can be placed on a retaining member. The first housing part can be screwed to the second housing part, with the screw connection being made using connecting screws that can be screwed into the screw bosses. (Manufactured using A 501 204 c.)

[0016] - 5 - In the screw connection, the connecting screws extend with play through the retaining links and support elements mounted on the screw bosses. During assembly of the dispensing device, the intermediate section and the first end section of the jet tube, which includes the flat jet nozzle, can be inserted into the second housing part, with the retaining links of the intermediate section and the retaining links of the first end section of the jet tube each resting on a screw boss of the second housing part. The first housing part can then be placed onto the second housing part, with the support elements of the first housing part resting on the retaining links, so that the retaining links occupy a position between the support elements of the first housing part and the screw bosses of the second housing part. The support elements, like the retaining links, have through holes.The two housing parts can then be screwed together using the connecting screws, with the intermediate part and the first end section of the nozzle (containing the flat jet nozzle) positioned between them. The connecting screws pass through the through-holes of the support elements and the through-holes of the retaining links with some play and can be screwed into the screw bosses. As a result, the intermediate part and the first end section of the nozzle (containing the flat jet nozzle) are clamped between the two housing parts in an orientation determined by the screw bosses and the retaining links mounted on them. No subsequent adjustment of the intermediate part and the first end section of the nozzle is necessary; rather, the alignment is determined by the retaining links and screw bosses.

[0017] The connecting screws pass through the support elements of the first housing part and the retaining elements of the intermediate part and the first end section of the nozzle with clearance. This ensures that the connecting screws exert a clamping force on the two housing parts and the retaining elements of the first end section of the nozzle and the intermediate part, but that the alignment of the intermediate part and the first end section is not affected. A 501 204 c

[0018] - 6 -

[0019] The alignment of the nozzle section relative to the first housing part is not affected by the connecting screws. The threads of the connecting screws engage only in the screw bosses of the second housing part, but not in the support elements of the first housing part, nor in the retaining elements of the first end section of the nozzle and the intermediate section. In particular, misaligned connecting screws have no noticeable influence on the alignment of the first end section of the nozzle and the intermediate section relative to the first housing part, and consequently, no noticeable influence on the alignment of the passage channel relative to the flat jet nozzle.

[0020] It is advantageous if at least the retaining elements of the intermediate part can be placed onto the corresponding screw bosses of the second housing part by forming a positive fit. This facilitates the alignment and positioning of the retaining elements on the screw bosses.

[0021] Preferably, the retaining elements of the intermediate part are designed in a U-shape in cross-section.

[0022] It is advantageous if the first end section of the nozzle, which extends into the housing, and the intermediate section each have a first pair of opposing retaining elements and a second pair of opposing retaining elements. This simplifies the positioning of the intermediate section and the first end section of the nozzle, and in particular prevents the first end section of the nozzle and / or the intermediate section from tilting.

[0023] The retaining elements are preferably designed as attachment pieces arranged on two opposing outer sides of the intermediate section and on two opposing outer sides of the first end section of the jet tube that extends into the housing. A 501 204 c

[0024] - 7 -

[0025] It is advantageous if the connecting screws have a self-tapping thread. This allows the connecting screws to be screwed into the screw bosses without the screw bosses having an internal thread that matches the external thread of the connecting screws. An internal thread is therefore not required for the screw bosses. This reduces the manufacturing costs of the dispensing device according to the invention.

[0026] In an advantageous embodiment of the dispensing device according to the invention, the housing has two opposing air intake chambers, between which the through-channel is arranged. The air intake chambers are in flow communication with the first channel section and each has at least one air inlet opening. In such an embodiment of the invention, the housing of the air-enveloping device surrounds two air intake chambers, which are arranged on opposing longitudinal sides of the through-channel and each have at least one air inlet opening and are in flow communication with the first channel section. This allows air to be drawn in through the at least one air inlet opening of the air intake chambers under the influence of the liquid exiting the flat jet nozzle.

[0027] In particular, it can be provided that the air intake spaces each have several air inlet openings, the air inlet openings preferably being evenly distributed along the passageway.

[0028] For example, it may be provided that the air inlet openings are arranged on both longitudinal sides of the passageway in one of the two housing parts, in particular in the first housing part, whereas the other of the two housing parts, in particular the second housing part, has no air inlet openings. A 501 204 c

[0029] - 8 -

[0030] In a preferred embodiment of the invention, the retaining elements of the intermediate part and the associated screw bosses and support elements of the first and second housing parts are recessed into the air intake spaces. In such an embodiment, the retaining elements of the intermediate part and the associated support elements and screw bosses are thus protected from external mechanical influences within the air intake spaces between the two housing parts.

[0031] It is advantageous if the extent of the passage channel in the jet plane is limited by paired interlocking projections and recesses of the intermediate part and the first housing part, which extend along the passage channel. In such an embodiment of the invention, the paired interlocking projections and recesses of the intermediate part and the first housing part form side walls of the passage channel, which limit the passage channel in the jet plane of the liquid jet and which increase in distance from each other as one approaches the outlet opening of the passage channel. In particular, it can be provided that the passage channel is separated from the laterally arranged air intake spaces by the paired interlocking projections and recesses.

[0032] The projections can be designed, for example, in the form of ribs, and the recesses can be designed, for example, in the form of complementary grooves into which a corresponding rib is inserted.

[0033] It is particularly advantageous if the paired interlocking projections and recesses form a labyrinth seal. This allows the passage channel to be sealed against the laterally arranged air intake spaces without the need for an elastomer to create the seal. This results in a further reduction in manufacturing and assembly costs. The labyrinth seals are designed to ensure that the air intake is not obstructed by the airflow. (See A 501 204 c.)

[0034] - 9 - It was ensured that liquid droplets could not pass unhindered from the through-channel to the air intake chambers. As already mentioned, the air intake chambers are in flow communication with the first channel section of the through-channel, in which a negative pressure exists due to the exit of the liquid jet from the flat jet nozzle. Under this effect, ambient air is drawn into the first channel section to form an air jacket surrounding the liquid jet. The negative pressure prevailing in the first channel section results in a negative pressure also acting in the air intake chambers. By means of the labyrinth seals, which are formed by the paired interlocking projections and recesses of the intermediate section and the first housing section, it is ensured that, despite the negative pressure prevailing in the air intake chambers, practically no liquid droplets can penetrate from the through-channel into the air intake chambers.

[0035] The outlet opening of the through-channel is located on an end face of the housing of the air-enclosing device facing away from the jet-generating device. It is advantageous if the intermediate section and the second housing section have interlocking projections and recesses in the area of ​​the end face, forming a labyrinth seal extending along the outlet opening. The labyrinth seal ensures that liquid droplets cannot enter a gap between the intermediate section and the second housing section from the outlet opening. As already mentioned, the first housing section, in combination with the intermediate section, forms the through-channel, whereas the second housing section preferably forms only a housing half-shell that covers the intermediate section on its side facing away from the first housing section, thus forming the gap.The space between the air intakes can be directly connected to the laterally arranged air intake spaces, so that a negative pressure also exists in the space between. To prevent liquid droplets from being drawn into the space between the outlet opening of the through-channel under the influence of the negative pressure, A 501 204 c.

[0036] - 10 - long, the intermediate part and the second housing part preferably have interlocking projections and recesses in the area of ​​the front face of the housing, which form a labyrinth seal.

[0037] In an advantageous embodiment of the invention, the outlet opening of the through-channel is bounded by a sharp-edged rim with an edge radius of at most 0.5 mm, in particular at most 0.3 mm, for example at most 0.15 mm. The sharp-edged rim ensures that the liquid jet does not lose its compactness in the area of ​​the outlet opening due to the formation of air vortices and turbulence. In particular, the sharp-edged rim counteracts the spraying of microdroplets at the outlet opening.

[0038] To increase the mechanical strength of the housing of the air enclosing device, it is advantageous if the first housing part has reinforcing ribs on its outer side facing away from the passage channel.

[0039] In a preferred embodiment of the invention, the second housing part has reinforcing ribs on its inner surface facing the intermediate part. The second housing part can have a smooth outer surface facing away from the intermediate part. This allows for a particularly attractive housing design.

[0040] The following description of an advantageous embodiment of the invention, in conjunction with the drawing, serves for further explanation. The drawing shows:

[0041] Figure 1: a perspective view of an output device from an oblique angle above;

[0042] Figure 2: a perspective view of the output device made of

[0043] Figure 1, oblique view from below; A 501 204 c

[0044] - 11 -

[0045] Figure 3: a top view of the output device from Figure 1;

[0046] Figure 4: a bottom view of the output device from Figure 1;

[0047] Figure 5: a side view of the output device from Figure 1;

[0048] Figure 6: a sectional view of the output device along line 6-6 in

[0049] Figure 5;

[0050] Figure 7: a sectional view of the output device along line 7-7 in

[0051] Figure 3;

[0052] Figure 8: an enlarged view of detail X from Figure 7;

[0053] Figure 9: a sectional view along line 9-9 in Figure 3;

[0054] Figure 10: a sectional view along line 10-10 in Figure 3;

[0055] Figure 11: a perspective view of the output device in the style of an exploded view;

[0056] Figure 12: a perspective view of the output device in the manner of an exploded view according to Figure 11, wherein an end section of a jet tube and an intermediate part have been inserted into a first housing part.

[0057] In the drawing, an advantageous embodiment of an output device according to the invention is schematically depicted and is labelled overall with reference numeral 10.

[0058] The output device 10 comprises a beam generating device 11 and an air enclosing device 12. By means of the beam generating device- A 501 204 c

[0059] - 12 - By means of device 11, a liquid jet 14, which expands fan-like in a jet plane 13, can be generated and enveloped by an airflow by means of the air-enveloping device 12. The liquid jet 14 enveloped by an airflow can be directed onto an object to be cleaned by means of the dispensing device 10. The jet plane 13 and the liquid jet 14 are shown schematically in dashed lines in Figure 6.

[0060] The jet generation device 11 comprises a jet tube 16, the first end section 18 of which is immersed in a housing 20 of the air enclosure device 12. The second end section 22, located opposite the first end section 18, has a bayonet connector 24, by means of which the jet tube 16 can be connected to a liquid supply line, which is known per se and therefore not shown in the drawing for the sake of clarity. A pressurized liquid from a pressure cleaning device, in particular a high-pressure cleaning device, which is also known per se and therefore not shown in the drawing, can be supplied to the jet tube 16 via the liquid supply line. Water is preferably used as the liquid.

[0061] The first end section 18, which extends into the housing 20, carries a flat jet nozzle 26, which, in the illustrated embodiment, is pressed into a pipe 28 of the jet tube 16. The flat jet nozzle 26 is held on the first end section 18 of the jet tube 16 in a rotationally fixed and axially immovable manner. It has a nozzle contour and a nozzle outlet opening designed such that the liquid discharged from the flat jet nozzle 26 forms a fan-shaped spray pattern, with the spray angle θ being 20° to 30° in the exemplary embodiment shown, in particular 23° to 27°, for example 25°.

[0062] The first end section 18 of the jet tube 16, which plunges into the housing 20, carries on its outside a first pair of retaining elements 30, 32, which are opposite each other and are designed as attachment pieces that are attached to the A 501 204 c

[0063] - 13 -

[0064] Pipe 28 is connected in one piece and is aligned perpendicular to a longitudinal axis 34 of the jet nozzle 16. At their free ends facing away from the pipe 28, the retaining elements 30, 32 each have a through-hole 36.

[0065] In the direction of the flat jet nozzle 26, offset from the first pair of retaining elements 30, 32, the jet pipe 16 has a second pair of retaining elements 38,

[0066] 40, which are opposite each other and are identically designed to the retaining elements 30, 32.

[0067] As already mentioned, the air enclosure device 12 has a housing 20. The housing 20 has a first housing part 41 and a second housing part 42, each forming a housing half-shell. The first housing part 41 forms, among other things, a bottom surface of the housing 20, and the second housing part 42 forms, among other things, a top surface of the housing 20. On its outer surface facing away from the second housing part 42, the first housing part 41 has several first reinforcing ribs 43, and the second housing part 42 has several second reinforcing ribs 45 on its inner surface facing the first housing part 41. On its outer surface facing away from the first housing part 41, the second housing part 42 is smooth.

[0068] An intermediate part 44 is arranged between the first housing part 41 and the second housing part 42, which in combination with the first housing part

[0069] 41 forms a through-channel 46. This is particularly evident from Figure 7. The through-channel 46 has a first channel section 48, which is arranged a short distance downstream of the flat jet nozzle 26, and to which a second channel section 50 connects in the direction away from the flat jet nozzle 26.

[0070] In the area between the flat jet nozzle 26 and the first channel section 48, the housing 20 has two opposing air intake openings A 501 204 c

[0071] - 14 -

[0072] The first channel section 48 is connected to the first channel section 48 by air inlet openings 52 and 54. The second channel section 50 extends to an outlet opening 56 of the through-channel 46, widening fan-like in the jet plane 13 of the liquid jet 14 emanating from the flat jet nozzle 26 as it approaches the outlet opening 46. As can be clearly seen in Figure 6, the first channel section 48 receives the liquid jet 14 provided by the flat jet nozzle 26. Under the influence of the liquid jet 14 exiting the flat jet nozzle 26, ambient air is drawn in through the air intake openings 52 and 54. This air envelops the liquid jet 14 and is discharged together with the liquid jet 14 through the outlet opening 56.

[0073] Along the longitudinal sides of the passage 46, the housing 20 has a first air intake chamber 61 and a second air intake chamber 62 opposite it, extending practically over the entire length of the passage 46. The air intake chambers 61 and 62 each have a plurality of air inlet openings 64 and 66, respectively, which are designed as perforations in the first housing part 41. This is particularly evident from Figures 2, 4, 6, and 7. Under the influence of the liquid jet 14 emanating from the flat jet nozzle 26, a negative pressure also forms in the air intake chambers 61 and 62, so that ambient air can be drawn in through the air inlet openings 64 and 66. This air reaches the first channel section 48 of the passage 46 and envelops the liquid jet in a mantle-like manner.

[0074] The extent of the passage channel 46 in the beam plane 13 is limited by side walls 68, 70 of the passage channel 46. The side walls 68, 70 are each formed by a rib-like projection 72 of the first housing part 41 and a complementary groove-like recess 74 of the intermediate part 44, which receives the rib-like projection 72, forming a labyrinth seal 76. The labyrinth seal 76 ensures that even under the influence of the air intake spaces 61, 62 A 501 204 c

[0075] - 15 - due to the prevailing negative pressure, no liquid droplets can pass from the passage channel 46 into the air intake chambers 61, 62.

[0076] The outlet opening 56 is located on an end face 78 of the housing 20, which faces away from the jet generating device 11. In the region of the end face 48, the intermediate part 44 has a groove-like recess 80 on its upper side, which faces away from the passage channel 46 and towards the second housing part 42. A complementary, rib-like projection 82 of the second housing part 42 engages in this recess, forming a further labyrinth seal 84. The second housing part 42 forms a housing half-shell that covers the intermediate part 44 on its side facing away from the first housing part 41, forming a gap 86. The intermediate space 86 is in flow communication with the air intake spaces 61, 62 arranged on both sides of the passage channel 46, so that under the influence of the liquid jet 14 emerging from the flat jet nozzle 26 a negative pressure also prevails in the intermediate space 86.To prevent liquid droplets from entering the space 86 at the front face 78 of the housing 20 under the influence of the negative pressure, the labyrinth seal 84 is used.

[0077] The outlet opening 56 of the passage channel 46 is bounded by a sharp-edged rim 88, the edge radius of which is a maximum of 0.15 mm in the illustrated embodiment. The sharp-edged rim ensures that the liquid jet 14 does not lose its compactness in the area of ​​the outlet opening 56 due to the formation of air vortices and turbulence. In particular, the sharp-edged rim 88 counteracts the spraying of microdroplets at the outlet opening 56.

[0078] The alignment of the intermediate part 44 in the housing 20 of the air enclosure device 14 is effected by means of a third pair of retaining members 90, 92, which are arranged opposite each other on the outer sides of the side walls 68, 70, and a fourth pair of retaining members 94, 96, which extend in the direction of the A 501 204 c

[0079] - 16 -

[0080] The outlet opening 46 is offset from the retaining members 90, 92 and is arranged on the outer sides of the side walls 68, 70 and is opposite each other.

[0081] The retaining elements 90, 92 and 94, 96 extend into the air intake spaces 90, 92 and 94, 96 and are designed as U-shaped extension pieces in cross-section, each of whose free end regions has a through-hole 98. This is particularly evident from Figure 9.

[0082] The second housing part 42 has a total of eight screw bosses 101 on its inner side facing the first housing part 41, arranged in pairs. The retaining elements 30, 32, 38, 40, 90, 92 and 94, 96 are each assigned to one of the screw bosses 101 and can be placed onto their respective assigned screw bosses 101 during the assembly of the dispensing device 10.

[0083] The first housing part 41 has a total of eight identically designed support elements 110 in the form of recesses, each of which can be placed on a retaining member 30, 32, 38, 40, 90, 92 or 94, 96 and each of which has a through-hole 112. This is particularly evident from Figure 9.

[0084] During the assembly of the dispensing device 10, in a first step the first end section 18 of the jet tube 16, which carries the flat jet nozzle 26, and the intermediate part 44 can be inserted into the second housing part 42, whereby the retaining elements 30, 32 and 38, 40 of the first end section 18 and the retaining elements 90, 92 and 94, 96 of the intermediate part 44 can be placed on the respective associated screw bosses 101.

[0085] In a further assembly step, the first housing part 41 can then be placed on the second housing part 42 with the first end section 18 of the jet tube 16 and the intermediate part 44 interposed, the support elements 110 each resting on a retaining member 30, 32, 38, 40, 90, 92, 94, 96 and the through holes 112 of the support elements 110 each with A 501 204 c

[0086] - 17 - a through hole 36 or 98 of the retaining elements 30, 32, 38, 40, 90, 92, 94, 96 are aligned.

[0087] Subsequently, in a further assembly step, the two housing parts 41, 42 can be screwed together using connecting screws 114. The connecting screws 114 pass through the through holes 112 and 36, 98 with some play and can each be screwed into a screw boss 101. The connecting screws 114 have a self-tapping thread, so the screw bosses 101 do not need to have a matching internal thread.

[0088] After the dispensing device 10 has been assembled, the first end section of the jet tube 16 and the intermediate section 44 are clamped between the two housing parts 41, 42, aligning themselves in such a way that the liquid jet 14 emanating from the flat jet nozzle 26 can flow through the passage channel 46 without obstruction. For this purpose, the passage channel 46 is aligned in the jet plane 58 of the liquid jet 14. The alignment of the first end section 18 of the jet tube 16 and the intermediate part 44 is ensured by the screw bosses 101 and the retaining elements 30, 32, 38, 40, 90, 92 and 94, 96 mounted thereon, whereby the retaining elements and consequently also the first end section 18 and the intermediate part 44 are clamped between the support elements 110 and the screw bosses 101 and consequently between the two housing parts 41, 41.

[0089] The assembly of the dispensing device 10 is very simple, without the risk of misalignment of the through channel 46 relative to the first end section 48 of the jet tube 16 and thus relative to the flat jet nozzle 26, which forms the liquid jet 14 which expands fan-shaped in the jet plane 13.

Claims

A 501 204 c - 18 - PATENT CLAIMS 1. Dispensing device for dispensing a liquid jet surrounded by a sheath-like airflow and expanding in a fan shape in a jet plane, comprising a jet generating device (11) for generating the liquid jet (14) and an air-enveloping device (12) for enveloping the liquid jet (14) with an airflow, wherein the jet-generating device (11) has a jet tube (16) which carries a flat jet nozzle (26) at a first end section (18), and wherein the air-enveloping device (12) has a passage channel (46) with a first channel section (48) for receiving the liquid jet (14) and with a second channel section (50) for discharging the liquid jet (14) and the surrounding airflow, wherein the first channel section (48) is in flow communication with at least one air intake opening (52, 54) of the dispensing device (10) and the second channel section (50) extends to an outlet opening (56) and widens fan-shaped in the jet plane (13), and wherein the air enclosing device (12) has a housing (20) with a first housing part (41) and a second housing part (42), wherein the first end section (18) of the jet tube (16) is immersed in the housing (20), characterized in that the air enclosing device (12) has an intermediate part (44) which, in combination with the first housing part (41), defines the passage channel (46) trains,wherein the intermediate part (44) and the first end section (18) of the jet tube (16) are clamped between the first housing part (41) and the second housing part (42), wherein the passage channel (46) is aligned in the beam plane (13).

2. Dispensing device according to claim 1, characterized in that the first housing part (41) can be screwed to the second housing part (42) by means of connecting screws (114), wherein the second housing part A 501 204 c - 19 - (42) has screw bosses (101) into which a connecting screw (114) can each be screwed, and wherein the intermediate part (44) and the first end section (18) of the jet tube (16) have several retaining members (30, 32, 38, 40, 90, 92, 94, 96) which can each be placed on a screw boss (101), and wherein the first housing part (41) has support elements (110) which can be placed on the retaining members (30, 32, 38, 40, 90, 92, 94, 96), wherein the connecting screws (114) engage the support elements (110) and retaining members (30, 32, 38, 40, 90, 92, 94, 96) with clearance.

3. Dispensing device according to claim 2, characterized in that at least the retaining members (90, 92, 94, 96) of the intermediate part (44) can be placed onto the respective associated screw bosses (101) of the second housing part (42) by forming a positive fit.

4. Dispensing device according to claim 2 or 3, characterized in that the first end section (18) of the jet tube (16) and the intermediate part (44) each have a first pair of opposing retaining members (30, 32; 90, 92) and a second pair of opposing retaining members (38, 40; 94, 96).

5. Dispensing device according to claim 2, 3 or 4, characterized in that the connecting screws (114) have a self-tapping thread.

6. Dispensing device according to one of the preceding claims, characterized in that the housing (20) has two opposing air intake spaces (61, 62) between which the through channel (46) is arranged, wherein the air intake spaces (61, 62) are in flow communication with the first channel section (48) and each has at least one air inlet opening (64, 66). A 501 204 c - 20 - 7. Dispensing device according to claim 6, characterized in that the retaining members (90, 92, 94, 96) of the intermediate part (44) and the screw domes (101) and support elements (110) of the first and second housing part (41, 42) associated with them are immersed in the air intake spaces (61, 62).

8. Dispensing device according to one of the preceding claims, characterized in that the extent of the through-channel (46) in the beam plane (13) is limited by pairwise interlocking projections (72) and recesses (74) of the intermediate part (44) and the first housing part (41) which extend along the through-channel (46).

9. Dispensing device according to claim 8, characterized in that the projections are designed in the form of ribs (72) and the recesses (74) are designed in the form of complementary grooves (74) into which an associated rib (72) is inserted.

10. Dispensing device according to claim 8 or 9, characterized in that the pairwise interlocking projections (72) and recesses (74) form a labyrinth seal (76).

11. Output device according to one of the preceding claims, characterized in that the outlet opening (56) of the through-channel (46) is arranged on an end face (78) of the housing (20) facing away from the jet generating device (11) and the intermediate part (44) and the second housing part (42) have interlocking projections (82) and recesses (80) in the area of ​​the end face (78) which form a labyrinth seal (84) extending along the outlet opening (56). A 501 204 c - 21 - 12. Dispensing device according to one of the preceding claims, characterized in that the outlet opening (56) of the through-channel (46) is limited by a sharp-edged edge (88) whose edge radius is a maximum of 0.5 mm, in particular a maximum of 0.3 mm, for example a maximum of 0.15 mm.

13. Dispensing device according to one of the preceding claims, characterized in that the first housing part (41) has first reinforcing ribs (43) on its outer side facing away from the through channel (46).

14. Dispensing device according to one of the preceding claims, characterized in that the second housing part (42) has second reinforcing ribs (45) on its inner side facing the intermediate part (44).

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