Liquid dispensing device
By integrating a filter device with strategically arranged edge sections at the air intake opening of liquid dispensing devices, the risk of blockages and wear is reduced, maintaining the effectiveness and compactness of the liquid jet.
Patent Information
- Application Number
- DE202024002494
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2024-02-15
- Publication Date
- 2025-04-30
- Estimated Expiration
- 2034-02-28
AI Technical Summary
Existing liquid dispensing devices with flat jet nozzles face issues with blockages and wear in the channel structure due to dirt particles entrained in the air flow, which reduces the compactness and effectiveness of the liquid jet.
A filter device is integrated at the air intake opening of the liquid dispensing device, featuring a through-opening with edge sections arranged at a distance that is between 0.1 and 1.0 times the smallest clear width of the channel structure, effectively retaining larger dirt particles while allowing smaller ones to pass through.
The filter device significantly reduces the risk of channel blockages and wear by retaining larger dirt particles, while allowing small particles to pass, thus maintaining the service life of the device and ensuring the compactness and effectiveness of the liquid jet.
Smart Images
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Abstract
Description
[0001] The invention relates to a liquid dispensing device for dispensing a liquid jet surrounded by an airflow in a fan-like manner in a jet plane, wherein the liquid dispensing device has a jet-generating part with a flat jet nozzle for generating the liquid jet, and wherein the liquid dispensing device has a housing that at least partially accommodates the jet-generating part, wherein a channel structure is arranged or formed in the housing, which has a liquid intake section arranged downstream of the flat jet nozzle for receiving the liquid jet and a liquid dispensing section adjoining the liquid intake section for dispensing the liquid jet, as well as at least one air intake section, wherein the liquid intake section is in flow communication with at least one air intake opening via the at least one air intake section.and wherein the liquid dispensing section extends to an outlet opening of the housing and widens in a fan shape in the jet plane.
[0002] Jet generating components with a flat jet nozzle for producing a fan-shaped liquid jet within a jet plane are used, for example, as accessories for pressure cleaning equipment, particularly high-pressure cleaning equipment, to cover a surface to be cleaned with a fanned-out liquid jet. Pressurized water, for example, can be used as the liquid. Such flat jet nozzles are known from WO 2014 / 090333 A1.
[0003] The fan-shaped jet of liquid exiting the flat jet nozzle interacts with the ambient air on its way to the surface being cleaned. This causes the jet to slow down and lose its compactness. To counteract this effect, JP 2004 / 223409 A proposes a liquid dispensing device that, in addition to a flat jet nozzle, uses a housing with a through-channel. This channel includes a liquid intake section for receiving the jet of liquid from the flat jet nozzle and a liquid dispensing section adjoining the intake section for discharging the jet of liquid.The liquid intake section is connected to the flow via at least one air intake channel with an air intake opening, and the liquid discharge section extends to an outlet opening of the housing and widens in a fan shape in the jet plane. Under the influence of the liquid jet, air is drawn into the liquid intake section through the at least one air intake opening, forming an air jacket surrounding the liquid jet and being discharged together with the liquid jet through the outlet opening. The air jacket surrounding the fan-shaped liquid jet reduces the interaction of the liquid jet with the ambient air.
[0004] Air is drawn into the liquid intake section, similar to a jet pump, by the liquid jet exiting the flat jet nozzle at considerable speed. Along with the air, dirt particles may also enter the housing's channel structure through the at least one air intake opening. This can lead to blockages in areas with narrow openings or to wear on the channel walls due to abrasion caused by the dirt particles.
[0005] The object of the present invention is therefore to further develop a liquid dispensing device of the generic type in such a way that the risk of clogging or wear of the channel structure is minimized.
[0006] This problem is solved according to the invention in a liquid dispensing device of the type mentioned at the outset by arranging a filter device at the at least one air intake opening, which has at least one through-opening bounded by an opening edge, wherein the opening edge has at least two opposing edge sections which are arranged at a distance from each other which is at least 0.1 times and at most 1.0 times the smallest clear width of the channel structure.
[0007] According to the invention, a filter device is arranged at the at least one air intake opening, the filter device having at least one through-opening. Air can be drawn into the channel structure through the at least one through-opening to form an air jacket surrounding the liquid jet. Any dirt particles carried by the air can, however, be at least partially retained, thus counteracting potential abrasion or clogging of the channel structure. The at least one through-opening of the filter device is bounded by an opening edge having at least two opposing edge sections arranged at a distance from each other that is at least 0.1 times and at most 1.0 times the smallest clear width of the channel structure.The smallest clear width of the channel structure is understood here to be the smallest dimension of the channel structure perpendicular to the flow direction of the fluid flowing through the channel structure. The clear width of the channel structure can vary in the area between the at least one air intake opening and the outlet opening. The risk of clogging of the channel structure by penetrating dirt particles is particularly high in the area of the channel structure where it has its smallest clear width. According to the invention, the at least one through-opening of the filter device is therefore designed such that at least two opposing edge sections of the opening's rim have a distance from each other that is at most 1.0 times the smallest clear width of the channel structure. This allows a considerable proportion of dirt particles, which pose the greatest risk of clogging the channel structure, to be retained.
[0008] The invention also incorporates the idea that very small dirt particles pose only a low risk of clogging the channel structure and, at most, have a minimal abrasive effect. This is taken into account according to the invention by ensuring that the distance between at least two opposing edge sections of the passage opening is at least 0.1 times the smallest clear width of the channel structure. Very small dirt particles can therefore pass through the passage opening unhindered. This, in turn, means that very small dirt particles are not deposited in significant quantities by the filter device and thus do not clog the at least one passage opening, which could shorten the service life of the filter device and consequently also the service life of the liquid dispensing device.Due to their low weight, very small dirt particles are carried along by the intake air. To prevent such dirt particles from being retained by the filter device and thus impairing its service life, the distance between at least two opposing edge sections of the at least one through-opening is at least 0.1 times the smallest clear width of the channel structure.
[0009] The design of the at least one through-opening in such a way that at least two opposing edge sections of the through-opening are arranged at a distance from each other that is at least 0.1 times and at most 1.0 times the smallest clear width of the channel structure, therefore makes it possible to minimize the risk of clogging and / or wear of the channel structure while maintaining the longest possible service life of the filter device.
[0010] The distance between at least two opposing edge sections of the at least one through-opening can be, in particular, 0.3 to 1.0 times the smallest clear width of the channel structure, for example, 0.5 to 1.0 times the smallest clear width of the channel structure. The greater the minimum distance between at least two opposing edge sections of the at least one through-opening, the longer the service life of the filter device, since fewer dirt particles are then deposited on the filter device.
[0011] In an advantageous embodiment of the invention, the channel structure has its smallest clear width in the region of the outlet opening of the housing. The clear width of the channel structure is defined here as its extent perpendicular to the beam plane in the region of the outlet opening. In such an embodiment of the invention, this extent perpendicular to the beam plane in the region of the outlet opening determines the distance between at least two opposing edge sections of the through-opening of the filter device, such that the distance between these opposing edge sections is at least 0.1 times and at most 1.0 times the distance between two opposing channel wall regions of the channel structure in the outlet opening.
[0012] It may be stipulated that the smallest clear width of the channel structure is the smallest distance between a bottom wall and a top wall of the liquid dispensing section of the channel structure. As already mentioned, the liquid dispensing section widens in the jet plane up to the outlet opening of the housing. Simultaneously, the liquid dispensing section may narrow perpendicular to the jet plane as it approaches the outlet opening, at least over part of its length, and in particular over its entire length. That is, the distance perpendicular to the jet plane between a top wall and a bottom wall of the liquid dispensing section may decrease to a minimum value, at least over part of its length.Reducing the distance between the bottom and top walls of the liquid intake section counteracts the increase in the cross-sectional area of the liquid discharge section, which is caused by the widening of the discharge section in the jet plane as it approaches the outlet. This, in turn, counteracts a decrease in the flow velocity of the air jacket surrounding the liquid jet within the discharge section. The flow velocity of the air jacket depends on the size of the cross-sectional area of the liquid discharge section. The more the cross-sectional area increases as it approaches the outlet, the more the flow velocity of the air jacket decreases.By narrowing the liquid dispensing section perpendicular to the jet plane, the increase in cross-sectional area caused by the widening of the liquid dispensing section in the jet plane can be at least partially compensated for. This, in turn, results in less impairment of the flow velocity of the air jacket surrounding the liquid jet within the liquid dispensing section. The reduced impairment of the air jacket's flow velocity, in turn, means that the liquid jet is slowed down less within the liquid dispensing section, and its compactness within this section is less affected.The smallest distance between the bottom wall and the ceiling wall of the liquid dispensing section thus defines the smallest clear width of the channel structure perpendicular to the jet plane, meaning that there is a high risk of clogging due to penetrating dirt particles in this area. Therefore, the distance between at least two opposing edge sections of the at least one through-opening of the filter device is advantageously at least 0.1 times and at most 1.0 times the smallest distance between the ceiling wall and the bottom wall of the liquid dispensing section.
[0013] In an advantageous embodiment of the invention, the smallest clear width of the channel structure is 1 mm to 6 mm, in particular 1.5 mm to 4 mm, for example 2 mm.
[0014] It is advantageous if the filter device has a plurality of through-openings which are circular, square or slotted, with slotted through-openings preferably being rectangular or trapezoidal.
[0015] Slot-shaped through-openings preferably extend in a radial direction or in a circumferential direction with respect to a central longitudinal axis of the housing.
[0016] It is advantageous if the at least one through-opening has two opposing edge sections that are arranged at a distance from each other of at least 0.2 mm and at most 3 mm, in particular at a distance of 1 mm to 2 mm.
[0017] In a particularly preferred embodiment of the liquid dispensing device according to the invention, the housing surrounds a through-channel extending from an inlet opening of the housing to the outlet opening of the housing, wherein a holding device is arranged in an inlet section of the through-channel adjoining the inlet opening, on which the jet-generating part is held and which is surrounded circumferentially by an air intake section of the channel structure, wherein the through-channel downstream of the air intake section forms the liquid intake section of the channel structure and subsequently the liquid dispensing section of the channel structure, and wherein a region of the inlet opening surrounding the jet-generating part forms an air intake opening on which a filter element is arranged.
[0018] It is advantageous if the filter device can be detachably connected to the holding device. For example, the filter device can be designed to lock into place on the holding device.
[0019] Alternatively or additionally, it may be provided that the filter device can be detachably connected to the housing and / or to the beam generation part.
[0020] In particular, it may be provided that the filter device can be positively fitted onto the beam-generating part. For example, the filter device can be pressed onto the beam-generating part.
[0021] In a preferred embodiment of the invention, a particularly simple assembly of the filter device is achieved by the filter device having two filter parts which surround the beam generating part in the area of the inlet opening in the circumferential direction over an angular range of a maximum of 180°.
[0022] The two filter components are preferably identical in design. This allows for larger quantities of filter components to be manufactured more cost-effectively. Assembly is also simplified when both filter components are identical.
[0023] The housing of the liquid dispensing device according to the invention preferably has two housing half-shells, to each of which a filter part is molded.
[0024] Alternatively or additionally, the housing may be provided with two housing halves that clamp the filter device, which is particularly designed in two parts, between them. For example, the filter device may be provided with at least one retaining projection that is positively engaged by complementary recesses in the housing halves.
[0025] In a particularly preferred embodiment of the invention, the filter device has a filter surface on which at least one through-opening is arranged, the filter surface projecting at least partially from the housing. This makes the filter surface more easily accessible to a user of the liquid dispensing device for cleaning purposes.
[0026] It is particularly advantageous if the filter surface is convexly curved or frustoconical in shape. This allows the filter surface to be larger for the same outer diameter compared to a flat filter surface. The force exerted on the filter device by the intake air is thus distributed over a larger filter area. This reduces the mechanical stress on the filter device and increases its service life. Furthermore, dirt particles adhering to the filter surface are easier to remove.
[0027] The filter device can be designed, for example, as a sieve, a grid, or a perforated plate. This allows for particularly cost-effective manufacturing of the filter device.
[0028] The following description of advantageous embodiments of the invention, in conjunction with the drawing, serves for further explanation. The drawing shows: Fig. 1: a perspective view of a first embodiment of a liquid dispensing device; Fig. 2: a top view of the liquid dispensing device from Fig. 1; Fig. 3: A sectional view of the liquid dispensing device along line 3-3 in Fig. 2; Fig. 4: A sectional view of the liquid dispensing device along line 4-4 in Fig. 3; Fig. 5: A first perspective view of the liquid dispensing device made of Fig. 1. In the style of an exploded view; Fig. 6: a second perspective view of the liquid dispensing device from Fig. 1. In the style of an exploded view; Fig. 7: A sectional view of the liquid dispensing device along line 7-7 in Fig. 2; Fig. 8: A sectional view of the liquid dispensing device along line 8-8 in Fig. 2; Fig. 9: A perspective view of a filter device of the liquid dispensing unit Fig. 1 with a view of the inside of the filter device; Fig. 10: a perspective view of the filter device made of Fig. 9 looking at an outside of the filter device; Fig. 11: a side view of the filter device; Fig. 12: a perspective view of a second embodiment of a liquid dispensing device; Fig. 13: a top view of the liquid dispensing device from Fig. 12; Fig. 14: a perspective view of the liquid dispensing device made of Fig. 12 in the style of an exploded view; Fig. 15: a sectional view of the liquid dispensing device along line 15-15 in Fig. 13; Fig. 16: A perspective view of a filter device of the liquid dispensing unit made of Fig. 12 with a view of an inside of the filter device; Fig. 17: a perspective view of the filter device made of Fig. 16 looking at an outside of the filter device; Fig. 18: a perspective view of a third embodiment of a liquid dispensing device; Fig. 19: a longitudinal section view of the liquid dispensing device made of Fig. 18; Fig. 20: a perspective view of a filter device of the liquid dispensing unit Fig. 18; Fig. 21: a perspective view of a fourth embodiment of a liquid dispensing device; Fig. 22: a perspective view of the liquid dispensing device from Fig. 21 in the style of an exploded view.
[0029] In the Fig. Figures 1 to 11 represent a first advantageous embodiment of a liquid dispensing device according to the invention for dispensing a liquid jet surrounded by an airflow in a mantle-like manner and expanding in a fan-like manner in a jet plane, shown schematically by way of example and labelled overall with reference numeral 10.
[0030] The liquid dispensing device 10 has a housing 12 formed by a first housing half-shell 14 and a second housing half-shell 16, which, in the illustrated embodiment, are screwed together by means of connecting screws 18. The housing 12 surrounds a through-channel 20 extending from an inlet opening 22, located on a rear side 24 of the housing 12, to an outlet opening 26, located on a front side 28 of the housing 12 opposite the rear side 24. Starting from the inlet opening 22, the through-channel 20 has an inlet section 30 in which a retaining device 32 is arranged.
[0031] In the exemplary first embodiment, the retaining device 32 is designed in a shell-like form and comprises a first partial shell 34 and a partial shell 36, each of which is integrally connected to the first housing half-shell 14 and the second housing half-shell 16, respectively, by means of retaining ribs 40 that are radially aligned to a longitudinal axis 38 of the passage channel 20 and evenly distributed around the circumference of the partial shells 34 and 36. This is particularly evident from Fig. 6 clearly.
[0032] The two partial shells 34, 36 accommodate between them a front area 42 of a jet generating part 44 of the liquid dispensing device 10 which faces the outlet opening 26, wherein the jet generating part 44 is held on the two partial shells 34, 36 in a rotationally fixed and axially immovable manner.
[0033] The jet generation element 44 has a liquid supply element 46, which forms a liquid inlet channel 48 and to which a flat jet nozzle 50 is connected in the direction of the outlet opening 26. The jet generation element 44 also has a nozzle retaining element 52, by means of which the flat jet nozzle 50 is fixed to the liquid supply element 46.
[0034] In the direction opposite the outlet opening 26, a connecting element 54 of the jet-generating part 44 adjoins the liquid supply element 46. This connecting element projects from the rear 24 of the housing 12 and is rotatably and axially immovably mounted on the liquid supply element 46 about the longitudinal axis 38 of the passage channel 20. The connecting element 54 has a connecting sleeve 56 with an internal thread 58. The connecting sleeve 56 is rotationally fixed within a plastic sheath 60, which the user can grasp to screw the connecting sleeve 56 to a complementary connecting element of a liquid supply line.
[0035] A jet nozzle or spray gun, for example, can be used as a liquid supply line, which can be supplied with pressurized liquid, especially pressurized water, by a pressure cleaning device.
[0036] Starting from the connecting element 44, the pressurized liquid can reach the flat jet nozzle 50 via the liquid supply element 46. The flat jet nozzle 50 has a nozzle contour and a nozzle outlet opening designed such that, upon exiting the flat jet nozzle 50, the liquid forms a fan-shaped liquid jet 64 expanding in a jet plane 62. The jet plane 62 and the liquid jet 64 are in Fig. 4 shown as dashed lines.
[0037] The retaining device 32 is surrounded in the inlet section 30 of the passage channel 20 by an annular space 70, which is penetrated radially by the retaining ribs 40. The annular space 70 adjoins, axially with respect to the longitudinal axis 38 of the passage channel 20, a region of the inlet opening 22 surrounding the jet generating element 44, which forms an air intake opening 72.
[0038] The through-channel 20, in combination with the holding device 32, defines a channel structure 74 of the liquid dispensing device 10, which extends from the air intake opening 72 to the outlet opening 26 and serves to receive air and liquid. The annular space 70 forms an air intake section 76 of the channel structure 74, adjoining the air intake opening 72 and extending to the nozzle outlet opening of the flat jet nozzle 50. A liquid intake section 78 of the channel structure 74 follows the air intake section 76 and extends to a constriction 68 of the through-channel 20. A liquid dispensing section 80 of the channel structure 74 follows the liquid intake section 78. The liquid dispensing section 80 extends to the outlet opening 26, widening in a fan shape in the beam plane 62 and narrowing increasingly perpendicular to the beam plane 62 up to the outlet opening 26.The beam plane 62 forms a plane of symmetry of the liquid output section 80.
[0039] The liquid dispensing section 80 is bounded perpendicular to the beam plane 62 by a bottom wall 82 and a ceiling wall 84, which form two opposing channel wall areas of the channel structure 74. In the beam plane 62, the liquid dispensing section 80 is bounded by two opposing side walls 86, 88, which also form two opposing channel wall areas of the channel structure 74.
[0040] As already mentioned, a fan-shaped liquid jet 64 can be discharged from the flat jet nozzle 50. Under the influence of the liquid jet 64, air is drawn into the liquid intake section 78 via the air intake opening 72 and the adjoining air intake section 76, forming an air jacket that surrounds the liquid jet 64 and is discharged together with the liquid jet via the liquid discharge section 80 and the outlet opening 26.
[0041] Air is drawn in by the liquid jet 64, which emerges at considerable speed from the nozzle outlet of the flat jet nozzle 50, similar to a jet pump. Along with the drawn-in air, dirt particles may enter the channel structure 74 via the air intake opening 72. This can lead to blockages in the channel structure 74 in areas with a small internal diameter, or to wear on the channel walls due to abrasion caused by the dirt particles.
[0042] To minimize the risk of clogging or wear of the channel structure 74, the liquid dispensing device 10 has a filter device 90 arranged at the air intake opening 72. In the exemplary first embodiment of the invention, the filter device 90 has two identically designed filter parts 92, 94, each of which is semi-ring-shaped and surrounds the jet-generating part 44 in the region of the inlet opening 22 circumferentially over an angle of 180°. The filter parts 92, 94 each have a locking hook 96 or 97, respectively, by means of which they can be locked to a partial shell 34 or 36 of the holding device 32. For this purpose, the partial shells 34, 36 each have a locking receptacle 98 or 99 in the form of an opening into which a locking hook 96, 97 can engage. This is particularly evident from the Fig. 5 and Fig. 8 clearly.
[0043] The two filter parts 92, 94 form a filter surface 100 on which a plurality of through-openings 102 are arranged. The through-openings 102 are slot-shaped and oriented radially with respect to the longitudinal axis 38 of the through-bore 20. Each through-opening 102 is bounded by an opening edge 104, which is essentially trapezoidal and has two opposing elongated edge sections 106, 108 and two opposing shorter edge sections 110, 112. This is illustrated, for example, by Fig. 10 clearly.
[0044] The passage openings 102 allow the intake air to flow through them practically unimpeded, whereas dirt particles carried by the air are at least partially retained. As already mentioned, dirt particles penetrating the channel structure 74 can, under certain circumstances, lead to a blockage of the channel structure 74 or to the channel walls of the channel structure 74 being subject to severe abrasion. The risk of blockage of the channel structure 74 exists particularly in areas of the channel structure 74 where it has its smallest clear diameter, that is, in an area where the channel structure 74 has its smallest dimension perpendicular to the flow direction of the fluid flowing through the channel structure 74. In the illustrated embodiment, the channel structure 74 has its smallest clear diameter at the outlet opening 26, in the form of the distance between the bottom wall 82 and the top wall 84.In the illustrated embodiment, this distance is 2 mm.
[0045] To counteract a possible blockage of the outlet opening 26, the opposing elongated edge sections 106, 108 of the opening edge 104 of the through openings 102 are spaced apart by a distance that is at least 0.1 times and at most 1.0 times the smallest clear width of the channel structure 74. In the illustrated embodiment, the distance between the elongated edge sections 106, 108 is 2 mm at the outer end and 1.3 mm at the inner end, with the outer and inner ends being measured along the longitudinal axis 38.The distance between the elongated edge sections 106, 108 is dimensioned such that, while preventing the ingress of dirt particles whose dimensions exceed the distance between the bottom wall 82 and the ceiling wall 84 in the area of the outlet opening 26, very small dirt particles, which pose only a very low risk of clogging the channel structure 74 and, at most, have a very low abrasive effect, can pass through the filter device 90. This prevents very small dirt particles from clogging the filter device 90 within a short time and thus shortening the service life of the filter device 90 and consequently also of the liquid dispensing device 10.
[0046] The distance between the opposing shorter edge sections 110, 112 is greater than the distance between the opposing elongated edge sections 106, 108. The distance between the shorter edge sections 110, 112 can, for example, be at least twice as large as the distance between the elongated edge sections 106, 108. In the exemplary first embodiment, the distance between the shorter edge sections 110, 112 is 5 mm to 7 mm.
[0047] To facilitate the removal of larger dirt particles that accumulate on the filter device 90, the filter surface 100 of the filter device 90 is inclined to the longitudinal axis 38 of the passage channel 20 and projects at least partially out of the housing 12, making it more easily accessible to the user. In the illustrated embodiment, the filter surface 100 is frustoconical or convex, curving outwards in the direction away from the housing 12.
[0048] On its outer surface 114, facing away from the housing 12, the filter device 90 has several radially oriented reinforcing ribs 116, which have a radially outer end section 118 that projects radially beyond a circumferential outer edge 120 of the filter device. The filter device 90 can be placed on the edge of the inlet opening 22 by means of these outer end sections 118 and supported against this edge.
[0049] To facilitate the mounting of the two filter parts 92, 94 on the air intake opening 72, the two filter parts 92, 94 each have several guide ribs 122 on their inner surface 121 facing the housing, which are essentially aligned parallel to the respective locking hooks 96. This is particularly evident from Fig. 9 clearly.
[0050] In the Fig. Figures 12 to 17 schematically depict a second advantageous embodiment of a liquid dispensing device according to the invention for dispensing a liquid jet surrounded by an airflow and fanning out in a jet plane. This embodiment is designated collectively by reference numeral 150. The liquid dispensing device 150 is designed largely identically to the one described above with reference to the Fig. Liquid dispensing device 1 to 11 described 10. For identical components, therefore, in the Fig. 12 to 17 use the same reference symbols as in the Fig. 1 to 11, and with regard to these components, reference is made to the preceding explanations to avoid repetition.
[0051] The liquid dispensing device 150 also has a housing 12 with a first housing half-shell 14 and a second housing half-shell 16, which are screwed together by means of connecting screws 18. The housing 12 surrounds a through-channel 20, which extends from an inlet opening 22 to an outlet opening 26 and, in combination with a retaining device 32, forms a channel structure 74 as already described above.
[0052] In contrast to the liquid dispensing device 10, the liquid dispensing device 150 employs a filter device 152, which is designed as a single unit and has a central opening 151 as well as a plurality of slot-shaped through-openings 154 extending circumferentially with respect to the longitudinal axis 38 of the housing 12. Each through-opening 154 is bounded by an opening edge 156, which has two opposing, circumferentially extending elongated edge sections 158, 160, connected to each other by two opposing, radially oriented shorter edge sections 162, 164. The elongated edge sections 162, 164 are arranged at a distance from each other that is at least 0.1 times and at most 1.0 times the smallest clear width of the channel structure 74.The shorter edge sections 162, 164 are arranged at a distance from each other that is greater than the distance between the elongated edge sections 162, 164. In the illustrated embodiment, the distance between the shorter edge sections is at least twice the distance between the elongated edge sections.
[0053] As with the liquid dispensing device 10 described above, the channel structure 74 of the liquid dispensing device 150 also has its smallest clear width in the area of the outlet opening 26, in the form of the distance between the bottom wall 82 and the top wall 84, where the distance is 2 mm. The distance between the opposing elongated edge sections 158, 160 is also 2 mm, but it could also be chosen to be smaller, in any case it must be at least 0.2 mm.
[0054] The filter device 152 can be placed axially onto the jet-generating part 44 during the assembly of the liquid dispensing device 150, starting from the flat jet nozzle 50, with it assuming a position immediately upstream of the connecting member 54 in one end position. The two housing halves 14, 16 can then be joined and screwed together, with the housing halves 14, 16 engaging two diametrically opposed projections 166, 168 in the area of the inlet opening 22. These projections are located on the inner side 170 of the filter device 152 facing away from the connecting member 54. This is particularly evident from the Fig. 15 and Fig. 16 clearly. By means of the projections 166, 168 the filter device 152 is held axially immovably and rotationally fixed to the housing halves 14, 16 of the liquid dispensing device 150.
[0055] In addition to the projections 166, 168, a ring-shaped collar 172, oriented concentrically to the longitudinal axis 38, is arranged on the inner side 170 of the filter device 152 and surrounds the central opening 151. The collar 172 has two diametrically opposed, axially aligned retaining lugs 174, 176, which, when the two housing halves 14, 16 are joined, assume a position between the two partial halves 34, 36 of the retaining device 32 and thereby additionally secure the filter device 152.
[0056] By means of the filter device 152, the risk of clogging or wear of the channel structure 74 of the liquid dispensing device 150 can be minimized in accordance with the filter device 90 described above, whereby the minimum distance between the elongated edge sections 158, 160 of the through-bores 154 ensures that very small dirt particles are not retained to a large extent by the filter device 152 and consequently do not accumulate in large quantities on the filter device 152, so that the service life of the filter device 152 is not affected by very small dirt particles.
[0057] In the Fig. 18, Fig. 19 and Fig. Figure 20 is a third advantageous embodiment of a liquid dispensing device according to the invention for dispensing a liquid jet surrounded by an airflow in a fan-like manner and expanding in a jet plane, schematically illustrated and designated overall by reference numeral 200. The liquid dispensing device 200 is designed largely identically to the one described above with reference to the Fig. Liquid dispensing device 1 to 11 described 10. For identical components, therefore, in the Fig. 18, Fig. 19 and Fig. 20 uses the same reference symbols as in the Fig. 1 to 11, and with regard to these components, reference is made to the preceding explanations to avoid repetition.
[0058] The liquid dispensing device 200 also has a housing 12 with a first housing half-shell 14 and a second housing half-shell 16, which are screwed together by means of connecting screws 18. The housing 12 surrounds a through-channel 20, which extends from an inlet opening 22 to an outlet opening 26 and, in combination with a holding device 32 on which a jet-generating part 44 is held, forms a channel structure 74, which has an air intake section 76 that connects to an air intake opening 72 surrounding the jet-generating part 44 in the region of the inlet opening 22 in the circumferential direction.
[0059] The liquid dispensing device 200 has a filter device 202, which is formed in one piece in the form of a perforated plate 204. The perforated plate 204 has a central opening 203 and a plurality of through-openings 206, each bounded by a circular opening rim 208. The opening rim 208 has a plurality of diametrically opposed edge sections 210, 212, each arranged at a distance from the other corresponding to the diameter of the circular through-openings 206.In the preferred embodiment shown, the diameter and thus the distance between the opposing edge sections 210, 212 is 2 mm and is therefore 1.0 times the smallest clear width of the channel structure 74 of the liquid dispensing device 200, wherein the smallest clear width in the area of the outlet opening 26 is in the form of the distance between the bottom wall 82 and the top wall 84, which is also 2 mm in the liquid dispensing device 200.
[0060] The diameter of the circular passage openings 206 can also be chosen to be smaller, but it must not fall below 0.2 mm. This ensures that very small dirt particles are not retained by the filter device 202 and consequently do not accumulate on the filter device 202 to a large extent, thus preventing it from affecting its service life. On the other hand, choosing a diameter of the passage openings 206 of no more than 1.0 times the smallest clear width of the channel structure 74 ensures that large dirt particles, which pose the greatest risk of clogging the channel structure 74, are retained by the filter device 202.
[0061] To fix the filter device 202 to the inlet opening 22 of the housing 12 of the liquid dispensing device 200, the filter device 202 can be pressed onto the liquid supply element 46 during the assembly of the jet generating part 44, coming into contact with the rear end of the holding device 32 facing away from the outlet opening 26. The connecting element 54 can then be connected to the liquid supply element 46. The jet generating part 44 can then be inserted with its front section 42 into one of the two partial shells 34, 36 of the holding device 32, and subsequently the two housing halves 14, 16 can be joined together, with the front section 42 of the jet generating part 44 occupying a position between the two partial shells 34, 36 of the holding device 32.
[0062] In the Fig. 21 and Fig. Figure 22 is a fourth advantageous embodiment of a liquid dispensing device according to the invention for dispensing a liquid jet surrounded by an airflow in a fan-like manner and expanding in a jet plane. This embodiment is schematically illustrated and is collectively designated by reference numeral 230. The liquid dispensing device 230 is designed largely identically to the one described above with reference to the Fig. Liquid dispensing device 1 to 11 described 10. For identical components, therefore, in the Fig. 21 and Fig. 22 the same reference symbols used as in the Fig. 1 to 11, and with regard to these components, reference is made to the preceding explanations to avoid repetition.
[0063] The liquid dispensing device 230 also has a housing 12 with a first housing half-shell 14 and a second housing half-shell 16, which are screwed together by means of connecting screws 18. The housing 12 surrounds a through-channel 20, which extends from an inlet opening 22 to an outlet opening 26 and, in combination with a holding device 32 to which a jet-generating element 44 is attached, forms a channel structure 74 that connects to an air intake opening 72, which circumferentially surrounds the jet-generating element 44 in the region of the inlet opening 22. A filter device 232, comprising two filter parts 234, 236, is arranged at the air intake opening 72 of the liquid dispensing device 230. The filter parts 234, 236 are designed in a semi-ring shape and surround the beam generating part 44 in the area of the inlet opening 22 in the circumferential direction over an angular range of 180°.
[0064] In contrast to the filter parts 92, 94 described above with reference to the liquid dispensing device 10, the filter parts 234, 236 of the liquid dispensing device 230 are each molded onto one of the two housing half-shells 14, 16, so that together with a housing half-shell 14 or 16 they each form a one-piece plastic molded part.
[0065] The filter parts 234, 236 have a plurality of slot-shaped through-openings 238, which are designed in the same way as the through-openings 102 of the liquid dispensing device 10. To avoid repetition, reference is made to the preceding explanations. The through-openings 238 also have opposing, elongated edge sections, the distance between which is at least 0.1 times and at most 1.0 times the smallest clear width of the channel structure 74 of the liquid dispensing device 230.
[0066] The liquid dispensing device 230 can also be used to dispense a fan-shaped expanding jet of liquid, which is surrounded by a sheath-like airflow, whereby the risk of clogging or wear of the channel structure 74 of the liquid dispensing device 230 can be kept low without significantly impairing the service life of the liquid dispensing device, as has already been explained above with reference to the liquid dispensing devices 10, 150 and 200. QUOTES INCLUDED IN THE DESCRIPTION
[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature
[0000] WO 2014 / 090333 A1
[0002] JP 2004 / 223409 A
[0003]
Claims
[1] Liquid dispensing device for dispensing a liquid jet which is surrounded by an air flow and widens in a fan-shaped manner in a jet plane, wherein the liquid dispensing device (10; 150; 200; 230) has a jet generating part (44) with a flat jet nozzle (50) for generating the liquid jet (64), and wherein the liquid dispensing device (10; 150; 200;230) has a housing (12) at least partially accommodating the jet generating part (44), wherein a channel structure (74) is arranged or formed in the housing (12), which has a liquid receiving section (78) arranged downstream of the flat jet nozzle (50) for receiving the liquid jet (64) and a liquid discharge section (80) adjoining the liquid receiving section (78) for discharging the liquid jet (64), as well as at least one air intake section (76), wherein the liquid receiving section (78) is in flow connection with at least one air intake opening (72) via the at least one air intake section (76), and wherein the liquid discharge section (80) extends as far as an outlet opening (26) of the housing (12) and widens out in a fan shape in the jet plane (72), ; characterized bythat a filter device (90; 152; 202; 232) is arranged on the at least one air intake opening (76), which filter device has at least one through-opening (102; 154; 206; 238) delimited by an opening edge (104; 156; 208), wherein the opening edge (104; 156; 208) has at least two opposing edge sections (106, 108; 158, 160; 210, 212) which are arranged at a distance from one another which is at least 0.1 times and at most 1.0 times the smallest clear width of the channel structure (74). [2] Liquid dispensing device according to claim 1, characterized by that the channel structure (74) has its smallest clear width in the region of the outlet opening (26). [3] Liquid dispensing device according to claim 1 or 2, characterized by that the smallest clear width of the channel structure (74) is the smallest distance that a bottom wall (82) occupies from a ceiling wall (84) of the liquid dispensing section (80). [4] Liquid dispensing device according to one of the preceding claims, characterized by that the smallest clear width of the channel structure (74) is 1 mm to 6 mm, in particular 1.5 mm to 4 mm. [5] Liquid dispensing device according to one of the preceding claims, characterized by that the filter device (90; 152; 202; 232) has a plurality of through openings (102; 154; 206; 238) which are circular, square or slit-shaped. [6] Liquid dispensing device according to one of the preceding claims, characterized by that the at least one through-opening (102; 154; 206; 238) has two opposing edge sections (106, 108; 158, 160; 210, 212) which are arranged at a distance from one another of at least 0.2 mm and a maximum of 3 mm, in particular 1 mm to 2 mm. [7] Liquid dispensing device according to one of the preceding claims, characterized bythat the housing (12) surrounds a through-channel (20) which extends from an inlet opening (22) of the housing (12) to the outlet opening (26) of the housing (12), wherein in an inlet section (30) of the through-channel (20) adjoining the inlet opening (22) there is arranged a holding device (32), on which the jet-generating part (44) is held and which is surrounded in the circumferential direction by an air intake section (76) of the channel structure (74), wherein the through-channel (20) downstream of the air intake section (76) forms the liquid receiving section (78) of the channel structure (74) and adjoining thereto the liquid discharge section (80) of the channel structure (74), and wherein a region of the inlet opening (22) surrounding the jet-generating part (44) forms an air intake opening (72), on which a filter device (90; 152; 202; 232) is arranged. [8] Liquid dispensing device according to claim 7, characterized bythat the filter device (90; 152) is detachably connectable to the holding device (32). [9] Liquid dispensing device according to one of the preceding claims, characterized by that the filter device (202) is detachably connectable to the housing (12) and / or to the jet generating part (44). [10] Liquid dispensing device according to one of the preceding claims, characterized by that the filter device (90; 232) has two filter parts (92, 94; 234, 236) which surround the jet generating part (44) in the region of the inlet opening (22) in the circumferential direction, each over an angular range of a maximum of 180°. [11] Liquid dispensing device according to claim 10, characterized by that the two filter parts (92, 94; 234, 236) are designed identically. [12] Liquid dispensing device according to claim 10 or 11, characterized bythat the housing (14) has two housing half-shells (16, 18), to each of which a filter part (234, 236) is formed. [13] Liquid dispensing device according to claim 10 or 11, characterized by that the housing (12) has two housing half-shells (14, 16) which clamp the filter device (152) between them. [14] Liquid dispensing device according to one of the preceding claims, characterized by that the filter device (90) has a filter surface (100) on which the at least one through-opening (102) is arranged, wherein the filter surface (100) protrudes at least partially from the housing (12). [15] Liquid dispensing device according to claim 14, characterized by that the filter surface (100) is convexly curved or frustoconical.
Citation Information
Patent Citations
Apparatus for jetting gas / liquid mixed flow
JP2004223409A
Fan nozzle
WO2014090333A1