Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
  • B05B1/28—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with integral means for shielding the discharged liquid or other fluent material, e.g. to limit area of spray; with integral means for catching drips or collecting surplus liquid or other fluent material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
  • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
  • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
  • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
  • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
  • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
  • B05B1/3093—Recirculation valves, i.e. the valve element opens a passage to the nozzle and simultaneously closes at least partially a return passage the feeding means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
  • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
  • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
  • B05B15/555—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids discharged by cleaning nozzles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
  • B01F33/80—Mixing plants; Combinations of mixers
  • B01F33/84—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins
  • B01F33/841—Mixing plants with mixing receptacles receiving material dispensed from several component receptacles, e.g. paint tins with component receptacles fixed in a circular configuration on a horizontal table, e.g. the table being able to be indexed about a vertical axis
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B2210/00—Specific aspects of the packaging machine
  • B65B2210/06—Sterilising or cleaning machinery or conduits
  • B65B2210/08—Cleaning nozzles, funnels or guides through which articles are introduced into containers or wrappers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
  • B65B39/00—Nozzles, funnels or guides for introducing articles or materials into containers or wrappers
  • B65B39/001—Nozzles, funnels or guides for introducing articles or materials into containers or wrappers with flow cut-off means, e.g. valves
  • B65B39/004—Nozzles, funnels or guides for introducing articles or materials into containers or wrappers with flow cut-off means, e.g. valves moving linearly

Definitions

• the present invention relates to a dosing valve.
• the invention also relates to a dosing device for mixing fluids and a method for using a dosing valve or a device for dosing fluids.
• Paints or varnishes are usually stored and transported in sealed storage containers. Filling into these containers is fully automated, whereby the filling process simultaneously involves mixing different components so that different fluids are dosed into one container in order to fill the desired product as a finished mixture.
• the individual components of the paints or varnishes are dosed from storage tanks into the containers using dosing valves.
• the paints or varnishes are thus a mixture of different fluids, whereby the individual fluids are each dosed via specially assigned dosing valves and thus mixed in the container.
• a dosing device for dosing or mixing fluids in containers provided for this purpose is known, for example, from the publications EP 3 142 783 B1 and EP 0 786 287 A1 , which go back to the applicant.
• the individual components of the paints or varnishes are dosed under pressure from storage tanks. To avoid spilling, it is necessary for the nozzle to produce a jet that is as compact and directed as possible.
• the present invention is based on the technical problem of specifying an improved dosing valve which enables efficient and reliable operation and, in particular, an improved jet forming. Furthermore, a dosing device with such a dosing valve and a method for dosing fluid are to be disclosed.
• the invention relates to a dosing valve for dispensing a fluid, wherein the dosing valve comprises: an inlet and an outlet for circulating pressurised fluid to be metered, a nozzle for dispensing the fluid, wherein the nozzle has at least one outlet opening which can be closed by means of at least one valve piston of the dosing valve, and a nozzle head of the nozzle for beam shaping the fluid.
• the dosing valve is characterised in that the nozzle head (20) has an inner jacket surface which has a non-constant diameter at least in sections, wherein the inner jacket surface is widened from a first diameter to a second diameter when viewed along an outflow direction of the fluid, the inner jacket surface is narrowed from the second diameter to a third diameter, and the second diameter is larger than the first diameter and the second diameter is larger than the third diameter.
• the first diameter and the third diameter can be the same size.
• the first diameter and the third diameter can be different sizes.
• the inner jacket surface which widens and narrows again, is arranged downstream of the outlet opening and is intended for jet shaping.
• the fluid channel or fluid channels of the nozzle head are arranged downstream of the outlet opening and are intended for cleaning.
• the widening area and the narrowing area of the inner jacket surface can merge into one another without any jumps, whereby in particular a transition radius can be formed between the widening area and the narrowing area of the inner jacket surface.
• one or more steps Adjacent to the narrowing area of the jacket surface, one or more steps can be arranged, which can be circular cylindrical steps, for example. The steps can be widening.
• a first step or shoulder is provided which has a fourth diameter that is larger than the third diameter.
• a second step or shoulder is provided which has a fifth diameter which is larger than the third diameter and which is larger than the fourth diameter.
• the fifth diameter is larger than the second diameter.
• the dosing valve can have a cleaning device for cleaning the nozzle.
• the cleaning device can be an integral part of the dosing valve in particular means that the nozzle can be flushed and cleaned in a more targeted manner, which enables improved cleaning with a smaller amount of cleaning fluid compared to external, separate cleaning devices.
• the amount of cleaning fluid used to clean the nozzle can, in particular, be so small that the cleaning fluid is discharged into the filling container into which the fluid to be dosed is filled.
• the quantity of cleaning fluid is therefore so small that the quality of the fluid to be dosed is not impaired. It can be provided, that the cleaning fluid is discharged into the filling container, if the filling container has a volume of at least 60 liters. If the filling container has a volume of less than 60, cleaning fluid is discharged on a drip plate or another waste container, outside the filling container.
• the cleaning process is therefore more efficient overall, as no cleaning fluid has to be collected and disposed of as a waste product, cleaning of the nozzle is improved and a smaller amount of cleaning fluid is required overall.
• the cleaning process is also less time-consuming, as no external cleaning device needs to be transported to the dosing valve to be cleaned. This means that the cleaning process can be carried out at any time during operation.
• the cleaning device has an inlet for supplying pressurised cleaning fluid.
• the dosing valve is therefore coupled on the one hand to a storage tank in which the fluid to be dosed is stored and on the other hand to another storage tank for storing the cleaning fluid.
• the inlet for supplying cleaning fluid is provided separately from the inlet for supplying fluid to be dosed to the dosing valve.
• the dosing valve is therefore not flushed via the inlet for supplying fluid to be dosed, but via a separate inlet that is different from it.
• the cleaning device has a valve for controlling a cleaning process.
• the valve is in particular a pneumatic valve. It is understood that, according to alternative embodiments of the invention, other types of valves can also be used for switching and purging pressurised fluid, such as solenoid valves, hydraulic valves, mechanical valves, electromechanical valves or the like.
• the cleaning device can be controlled independently and separately from the valve piston of the dosing valve.
• the cleaning process can therefore take place independently of the position of the valve piston.
• the cleaning process can theoretically take place at any time, i.e. before and/or during and/or after the dosing process.
• the nozzle head can have at least one fluid channel, wherein the fluid channel penetrates in particular a wall of the nozzle head from an outer side of the nozzle head to an inner side of the nozzle head, and wherein the fluid channel is connected to the cleaning device for the supply of pressurised cleaning fluid.
• the fluid channel can have a diameter selected from a range of 0,5 mm to 2,0 mm, in particular selected from a range of 0,8 mm to 1,5 mm, or in particular can be approximately 1 mm.
• the nozzle head is used for jet shaping of the fluids to be dosed and, in particular, simultaneously forms a spray head of the cleaning device for dispensing the cleaning fluid.
• the nozzle head can have a fluid channel or several fluid channels, the mouth of which forms a spray opening or the mouths of which form spray openings for spraying out the cleaning fluid.
• the fluid channel can have an inclination relative to a longitudinal axis of the valve piston of the dosing valve and the fluid channel can be set up in particular for discharging fluid in the direction of the outlet opening of the nozzle.
• each fluid channel can have an inclination relative to the longitudinal axis of the valve piston of the dosing valve. All the fluid channels can have the same inclination relative to the longitudinal axis of the valve piston of the dosing valve.
• the fluid channels can have different inclinations relative to the longitudinal axis of the valve piston of the dosing valve.
• the inclination relative to the longitudinal axis of the valve piston can be selected from a range of 45° to 75°, in particular from a range of 55° to 65°, or can in particular be approx. 60°.
• a circumferential supply channel can be formed in the area of the outside of the nozzle head, whereby the circumferential supply channel is connected to the cleaning device and whereby the fluid channel opens into the circumferential supply channel. If several fluid channels are provided, each respective fluid channel in particular opens into the circumferential supply channel.
• Two or more fluid channels can be provided, in particular four or more fluid channels can be provided, in particular exactly four fluid channels can be provided.
• the fluid channels can be arranged at equidistant angular distances from one another. The angular spacings relate to the longitudinal axis of the valve piston.
• the fluid channels and/or their outlet openings provided for discharging the cleaning fluid can be evenly distributed in order to achieve a cleaning or rinsing result that is as homogeneous as possible.
• the cleaning device can have a connecting section, whereby the connecting section surrounds the nozzle head on the circumference.
• the connecting section can be screwed to the nozzle head or otherwise detachably attached to the nozzle head.
• the connecting section can be hooked onto the nozzle head and held positively on the nozzle head.
• the connecting section can rest on a collar of the nozzle head.
• the connecting section can be accommodated between a shoulder of the nozzle head and a shoulder of a housing of the dosing valve and held in a form-fitting manner.
• the nozzle head can penetrate an opening in the connecting section, so that the nozzle head sits at least partially within the connecting section.
• the nozzle head is protruding in an axial longitudinal direction over the connecting section and/or protruding over the cleaning device.
• the cleaning device is therefore integrated into the dosing valve in such a way that the axial accessibility of the nozzle head does not deteriorate in comparison to previously known solutions without an integrated cleaning device.
• the cleaning device therefore does not form a collision structure and does not lead to shading between the outlet opening and a container, so that the fluid flow is not impaired by the cleaning device.
• the circumferential supply channel can be formed between the connecting section and the nozzle head and can be limited by the connecting section and the nozzle head, wherein the circumferential supply channel has in particular a circumferential groove and wherein the circumferential groove is formed in particular on the connecting section and/or the nozzle head. In this way, a cost-effective integration of the supply channel can be achieved.
• the nozzle head can have two sleeves, namely an inner sleeve and an outer sleeve, whereby the inner sleeve sits partially or completely in an opening of the outer sleeve.
• the fluid channel or fluid channels can be formed between the inner and outer sleeve.
• the inner sleeve and/or the outer sleeve can have grooves that delimit a respective fluid channel.
• the inner sleeve and/or the outer sleeve may alternatively or additionally have a through opening or several through openings in order to form a respective fluid channel.
• An opening of the fluid channel into an interior of the nozzle head can be arranged on the inner jacket surface in the area of the inner jacket surface, which widens from the first diameter to the second diameter, or adjacent to it. In this way, at least partial shading of the mouth of the fluid channel to the outlet opening can be achieved. Clogging of the mouth of the fluid channel with paint or varnish can be avoided.
• the nozzle head can have a sleeve insert that is arranged downstream of the outlet opening and is intended for jet or beam shaping of the pressurised fluid to be dosed.
• the sleeve insert can be the inner sleeve described above.
• the inner jacket surface of the nozzle head can correspond at least in sections to the inner jacket surface of the sleeve insert or be formed by the inner jacket surface of the sleeve insert.
• the metering valve may be provided with two valve pistons and two outlet openings, namely a first valve piston for opening and closing a first outlet opening of the nozzle, a first spring being provided to keep the first valve piston pre-tensioned in a closed position, a second valve piston for opening and closing a second outlet opening of the nozzle, a second spring being provided to keep the second valve piston pre-tensioned in a closed position, the first valve piston and the second valve piston being arranged coaxially wherein the first valve piston is movable from the closed position to a first open position without lifting the second valve piston from its closed position, thereby providing a first open condition of the dosing valve, wherein the first valve piston is movable from the first open position to a second open position engaging the second valve piston and lifting the second valve piston from its closed position, thereby providing a second open condition of the dosing valve.
• the dosing valve can therefore be a multi-stage dosing valve, which enables step-by-step control of the dispensed volume flow. If intermediate positions of the individual valve pistons can be approached, infinitely variable control of the dispensed volume flow is also possible.
• the first piston has a projecting element for positively lifting the second piston from the second outlet opening and wherein the projecting element of the first piston is arranged in an opening of the second piston in order to provide an idle stroke of the first piston relative to the second piston, wherein the projecting element is arranged at a distance from a stop surface of the second piston during the idle stroke when moving the first piston from the closed position into the first open position of the first piston.
• the dosing valve additionally comprises a third valve piston for opening and closing a third outlet of the nozzle, wherein a third spring is provided for pre-tensioning the third valve piston in a closed position, wherein the first piston, the second piston and the third piston are arranged coaxially, wherein the first piston is movable from the closed position to the first open position and to the second open position, without lifting the third piston from its closed position, thereby providing the first open condition of the dispensing valve, the first piston being movable from the second open position to a third open position which engages the third piston and lifts the second and third pistons from their closed positions, thereby providing a third open condition of the dispensing valve.
• the invention relates to a dosing device for mixing fluids, wherein the dosing device comprises: a frame and at least one dosing valve, wherein the dosing valve is designed according to the invention and wherein the dosing valve is attached to the frame.
• the dosing valve can be held movably on the frame, whereby the dosing valve can be moved from a waiting position at a distance from the dosing point to a dosing position above a container.
• a plurality of dosing valves according to the invention can be held on the frame, in particular held on the frame in a movable manner as described above.
• the dosing valves can be arranged in a circle or partial circle around the dosing point, whereby each of the dosing valves can be displaced in a radial direction to the dosing position.
• the invention relates to a method comprising the method steps of: using a dosing device according to the invention or a dosing valve according to the invention to fill a container with at least one fluid, wherein the fluid is dosed into the container by means of the dosing valve; and, in particular, cleaning the nozzle of the dosing valve, wherein the cleaning takes place before and/or after the dosing of the fluid.
• a cleaning fluid used to clean the nozzle of the dosing valve is discharged into the same container into which the fluid is also dosed by means of the dosing valve.
• the quantity of cleaning fluid used to clean the nozzle is so small that the quality of the fluid to be dosed is not impaired.
• the contamination caused by the rinsing fluid is therefore below the limit of tolerance with regard to the contamination of the fluid to be dosed.
• liquids i.e. substances that are liquid at room temperature, such as paints and varnishes.
• Fig. 1 shows a cross-section of a first dosing valve 2 according to the invention.
• the dosing valve 2 is set up to dose a fluid 8.
• the dosing of the fluid 8 can also be referred to as dispensing or metering of the fluid 8.
• the dosing valve has an inlet 4 and an outlet 6 for the circulation of pressurised fluid 8 to be dosed.
• the dosing valve 2 has a nozzle 10 for dispensing the fluid 8.
• the dosing valve 2 is a three-stage valve and has three valve pistons 12, 14, 15 and three outlet openings 16, 18, 19 - namely a first valve piston 12 for opening and closing a first outlet opening 16 of the nozzle 10, a second valve piston 14 for opening and closing a second outlet opening 18 of the nozzle 10 and a third valve piston 15 for opening and closing a third outlet opening 19 of the nozzle 10.
• the dosing valve 2 has a nozzle head 20 for shaping the flow or beam of the pressurised fluid 8 to be dispensed.
• the dosing valve 2 has a cleaning device 22 for cleaning the nozzle 10.
• the cleaning device 22 has an inlet 24 for supplying pressurised cleaning fluid 26.
• the cleaning device 22 has a valve 28 for controlling a cleaning process.
• the valve 28 is a pneumatic valve.
• the pneumatic valve 28 has pneumatic connections 30, 32 for controlling or switching the valve 28.
• Fig. 2 shows a sectional enlargement of the dosing valve 2. To improve clarity, the fluid 8 to be dosed and the designations of the outlet openings 16, 18, 19 are not shown in the area of the nozzle head 20.
• the nozzle head 20 has fluid channels 34.
• the respective fluid channels 24 penetrate a wall 36 of the nozzle head 20 from an outer side 38 of the nozzle head 20 to an inner side 40 of the nozzle head 20.
• the fluid channels 34 are connected to the cleaning device 22 for the supply of pressurised cleaning fluid 26.
• the pressurised cleaning fluid 26 can be sprayed via the fluid channels 34 in the direction of the valve pistons 12, 14, 15 closing the outlet openings 16, 18, 19 in order to flush or clean the nozzle 20.
• the fluid channels 34 have an inclination relative to a longitudinal axis L of the valve pistons 12, 14, 15 of the dosing valve 2. Due to the respective inclination, the fluid channels 34 are each set up for the discharge of cleaning fluid 26 in the direction of the outlet openings 16, 18, 19 of the nozzle 10.
• the fluid channels 34 are arranged at equidistant angular distances from one another around the longitudinal axis L.
• the present four fluid channels 34 have a respective angular spacing of 90° from one another, i.e. from the respective neighbouring fluid channels 34, when viewed from above along the longitudinal axis L.
• Fig. 3 shows the nozzle head 20 individually in cross-section.
• the nozzle head 20 is composed of two sleeves, namely an inner sleeve 42 and an outer sleeve 44.
• the inner sleeve 42 can also be referred to as a sleeve insert, since the inner sleeve 42 is seated in the outer sleeve 44 of the nozzle head 20.
• the inner sleeve 42 or the sleeve insert 42 is arranged downstream of the outlet openings 16, 18, 19 in the fully assembled state and is intended for jet shaping of the pressurised fluid 8 to be dispensed ( Fig. 1 ).
• the inner sleeve 42 sits completely in an opening 46 of the outer sleeve 44 ( Fig. 3 ).
• the fluid channels 34 are formed between the inner sleeve 42 and the outer sleeve 44.
• the inner sleeve 42 has grooves 48 which delimit a respective fluid channel 34.
• the fluid channels 34 therefore consist, at least in sections, of grooves 48 of the inner sleeve 42.
• the outer sleeve 44 also has a plurality of through openings 50 to form the fluid channels 34.
• the through openings 50 merge into the grooves 48 to form the fluid channels 34.
• An angle of inclination a of the fluid channels 34 relative to the longitudinal axis L is approximately 60° in the present case.
• Part of a circumferential supply channel 52 is formed in the area of the outer side 38 of the nozzle head 20.
• the circumferential supply channel 52 is connected to the cleaning device 22 when the nozzle head 20 is fully assembled.
• All fluid ducts 34 open into the circumferential supply duct 52, so that all fluid ducts 34 can be supplied with cleaning fluid 26 by means of the supply duct 52.
• the circumferential supply channel 52 is limited by a circular groove 54 of the outer sleeve 44 of the nozzle head 20.
• the circumferential supply channel 52 is delimited by a connecting section 56 of the cleaning device 22, which surrounds the outer sleeve 44 on the circumferential side at the level of the circular circumferential groove 54 ( Fig. 2 ).
• the connecting section 56 is received between a collar 58 of the outer sleeve 44 of the nozzle head 20 and a shoulder 60 of a housing 62 of the dosing valve 2 and is held in a form-fitting manner.
• the nozzle head 20 is protruding in an axial longitudinal direction along the longitudinal axis L at least in sections over the connecting section 56 and protruding overall over the cleaning device 22.
• the nozzle head 20 has an inner jacket surface 64, which has a non-constant diameter, at least in sections.
• the inner jacket surface 64 is widened from a first diameter d1 to a second diameter d2 when viewed along an outflow direction R of the fluid to be dispensed.
• the inner jacket surface 64 is narrowed from the second diameter d2 to a third diameter d3 when viewed along the outflow direction R of the fluid to be dosed.
• the second diameter d2 is larger than the first diameter d1 and the second diameter d2 is larger than the third diameter d3.
• a respective mouth 66 of a respective fluid channel 34 into an interior 67 of the nozzle head 20 is arranged on the inner jacket surface 64 and in the respective region of said inner jacket surface 64, which widens from the first diameter d1 to the second diameter d2.
• the dosing valve 2 is a three-stage dosing valve.
• the three valve pistons 12, 14, 15 can be lifted sequentially from the three outlet openings 16, 18, 19 in order to dispense the fluid 8 to be dosed via the outlet openings 16, 18, 19.
• the dosing valve 2 is operated via a pull rod 68.
• a first spring 70 is associated with the first valve piston 12, which holds the first valve piston 12 preloaded in a closed position and presses it into the first outlet opening 16.
• a second spring 72 is associated with the second valve piston 14, which holds the second valve piston 14 pretensioned in a closed position and presses it into the second outlet opening 18.
• a third spring 74 is associated with the third valve piston 15, which holds the third valve piston 14 pretensioned in a closed position and presses it into the third outlet opening 18.
• valve pistons 12, 14, 15 are arranged coaxially to each other.
• the outlet openings 16, 18, 19 are arranged coaxially to each other.
• the first valve piston 12 sits inside the second valve piston 14, with the second valve piston 14 having the first outlet opening 16 at the end.
• the second valve piston 14 sits inside the third valve piston 15, with the third valve piston 15 having the second outlet opening 18 at the end.
• the third valve piston 15 is located inside the nozzle head 20, with the nozzle head 20 forming the third outlet opening 19 with its inner jacket surface 64.
• the first valve piston 12 can be moved from the closed position to a first open position without lifting the second valve piston 14 from its closed position, thereby providing a first opening state of the dosing valve 2.
• the first valve piston 12 is movable from the first open position to a second open position, wherein the first valve piston 12 engages with the second valve piston 14 and lifts the second valve piston 14 from its closed position, thereby providing a second opening state of the dosing valve 2.
• the first valve piston 12 can be moved from the closed position to the first and second open positions without lifting the third piston 15 from its closed position in order to provide the first opening state of the dispensing valve.
• the projecting element 75 of the first valve piston 14 is arranged in an opening of the second valve piston 14 in order to initially provide an idle stroke of the first valve piston 12 relative to the second valve piston 14 for the movement of the first valve piston 12 from the closed position to its first open position.
• the projecting element 75 is arranged at a distance from a stop surface of the second valve piston 14.
• the same principle is used to lift the third valve piston.
• the first valve piston thus performs an idle stroke relative to the third valve piston 15 from the closed position to the second open position, so that the latter remains in its closed position.
• the projecting element 75 which can also be referred to as a driver, comes into contact with a stop surface of the third valve piston 15, so that further lifting of the first valve piston 12 leads to positive lifting of the third valve piston 15.
• the principle is obvious from Fig. 5 .
• a third opening state of the dosing valve 2 can be provided. It is understood that intermediate positions can be set for each valve piston so that continuous flow rate adjustments are possible between the aforementioned positions.
• Fig. 5 shows a second dosing valve 76 according to the invention in cross-section. To avoid repetition, only the differences to the embodiment example described above are discussed below, with the same reference signs being assigned to the same features.
• the second dosing valve 76 differs from the first dosing valve 2 in that the second dosing valve 76 is a two-stage dosing valve.
• the second dosing valve has only two pistons 12, 15 with the respective outlet openings 16, 19.
• the second dosing valve 76 further differs from the first dosing valve 2 in that the second Dosing valve 76 has a nozzle head 78, which is shaped like a step at the end.
• an inner jacket surface 80 of the nozzle head 78 has two circular cylindrical steps 84, 86 adjacent to a narrowing region 82 of the jacket surface 80, which form a step-like widening of the cross-section.
• Fig. 6 shows a dosing device 90 according to the invention for mixing fluids, wherein the dosing device 90 has a frame 92 and a plurality of dosing valves 2 and/or a plurality of dosing valves 76, which are configured in accordance with the invention.
• the dosing valves 2, 76 are held on the frame 92.
• the dosing valves 2, 76 are movably held on the frame 92 and can be positioned from the shown waiting position into a dosing position above a container 94 in order to dose fluid 8 into the container 94.
• Each of the dispensing valves 2, 76 may be provided for dispensing a respective liquid that is different from the liquids dispensed by the other dispensing valves 2, 76.
• different liquids can be sequentially dispensed into the container 94 to provide a product, such as a paint or varnish, as a mixture of different liquids.
• a respective dosing valve 2, 72 can be cleaned with its respective cleaning device 22 before and/or after dosing.
• Cleaning can take place in the dosing position so that the rinsing fluid 28 is discharged into the container 94.
• the cleaning fluid 26 used to flush the nozzle 10 of the dosing valve is discharged into the same container 94 into which the fluid 8 is also dosed by means of the dosing valve 2, 76.
• Fig. 9 shows a third dosing valve 96 according to the invention in cross-section. To avoid repetition, only the differences to the embodiment example described above are discussed below, with the same reference signs being assigned to the same features.
• the third dosing valve 96 differs from the first dosing valve 2 in that the third dosing valve 96 has a nozzle head 98 that has no fluid channels 34 and that the dosing valve 96 has no cleaning device 22.
• Fig. 10 shows a cross-section of the nozzle head 98 of the dosing valve from Fig. 9 .
• Fig. 11 shows a perspective view of the nozzle head 98 from Fig. 10 .

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Citations (9)

• 2024
  • 2024-06-21 EP EP24183754.1A patent/EP4667113A1/fr active Pending
• 2025
  • 2025-06-18 WO PCT/EP2025/067005 patent/WO2025262095A1/fr active Pending

Patent Citations (9)

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