EP3681278A1

EP3681278A1 - Device for dispensing a spraying agent

Info

Publication number: EP3681278A1
Application number: EP18769617.4A
Authority: EP
Inventors: Bernd Stuke; Jochen Glasbrenner; Olaf Ohlhafer; Peter Schwaderer
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2017-09-15
Filing date: 2018-09-06
Publication date: 2020-07-22
Also published as: DE102017216370A1; RU2020112535A; US20200206770A1; AU2018333393A1; BR112020003371A2; WO2019052883A1

Abstract

The invention relates to a device (10) for dispensing a spraying agent (30), in particular a plant protection agent (30), comprising a mixing unit (12) for mixing two active agents (20, 24) to form a spraying agent (30), wherein at least one of the active agents (20) can be supplied to the mixing unit (12) under pressure by means of a throttle unit (14), the throttle unit (14) has a feed channel (32) and a discharge channel (34), which can be fluidically connected to each other via at least one throttle channel (36a, b, c, d) in dependence on the position of a throttle element (38) of the throttle unit (14) arranged for movement relative to the feed channel (32) and the discharge channel (34), in order to adjust a flow rate of the at least one active agent (20) that should be supplied to the mixing unit (12), and the at least one throttle channel (36a, b, c, d) is arranged on the throttle element (38) and has a fixed channel cross-section in order to keep the flow rate of the at least one active agent (20, 24) therethrough constant.

Description

Description title

Device applying a spray prior art

The invention relates to a device for dispensing a spray, in particular a pesticide, with a mixing unit for mixing two active agents to a spray, wherein at least one of the active agent via a throttle unit of the mixing unit can be fed under pressure, wherein the throttle unit an inlet channel and a drain channel which can be fluidically connected to one another via at least one throttle channel as a function of a position of a throttle element of the throttle unit movably arranged relative to the inlet channel and the outlet channel, in order to set a mass flow of the at least one active agent to be supplied to the mixing unit.

In conventional agriculture, a variety of agents to

Fertilization, growth support and in particular for the protection of

Crops used. This protection is directed against weed (herbicides), fungi (fungicides), pest (insecticides) and disease infestation. Typically, these agents are used as an aqueous solution with a hydraulic spray or

Spray system deployed on the field. Here, both the amount and composition of the spray or the spray mixture and the

Concentration of the used sprays (active ingredients) before the actual

Application determined and mixed.

DE 10 2004 047 585 AI discloses an injection device for spraying liquids for agricultural purposes, wherein by means of a

Dilution pump a constant mixing ratio of drug and

Carrier liquid is achieved. Disclosure of the invention

The present invention is a device according to the aforementioned type, wherein the at least one throttle channel is arranged on the throttle element and has a fixed channel cross section to the

to keep constant flow rate of the at least one active agent.

The subject matter of the present invention is furthermore a method for applying a spraying agent, in particular a crop protection agent, with the steps:

- Providing a mixing unit for mixing two active agents to one

Spray;

- Providing a throttle unit with an inlet channel and a drain channel, which arranged via at least one throttle channel in response to a position of a relative to the inlet channel and the flow channel movable

Throttle element of the throttle unit are fluidically connected to each other to set a mixing unit to be supplied flow rate at least one of the active agent, wherein the at least one throttle channel is disposed on the throttle element and having a fixed channel cross-section to the

to keep the flow rate of the at least one active agent constant;

- Supplying at least one of the active means of the mixing unit via the throttle unit under pressure such that the volume flow of the at least one active agent to be supplied to the mixing unit is kept constant by means of the throttle unit; and

- spreading the spray.

The invention also relates to the use of a throttle unit for adjusting a mixing unit of a device for dispensing a

Spraying means to be supplied constant flow rate of at least one active agent, the throttle unit having an inlet channel and a drain channel, which are fluidly connected to each other via at least one throttle channel in response to a position of a relative to the inlet channel and the drain channel throttle element of the throttle unit to the mixing unit to set to be supplied constant flow rate of at least one active agent, wherein the at least one throttle channel is arranged on the throttle element and has a fixed channel cross-section in order to keep constant the flow rate of the at least one active agent.

In the context of the present invention, a device for dispensing a spray can be understood to mean a device by means of which a spray agent, in particular a liquid spray agent, can be dispensed or dispensed. The device or dispensing device can, for example, a

Plant protection device or a sprayer, in particular a field sprayer.

The device may include one or more dispensing elements to dispense the spray. The dispensing element can be, for example, a nozzle element, in particular a spray nozzle. It is conceivable that the device emits the spray in the form of a jet or a spray. The device may further comprise a plurality of tanks for the active agents. The device can be arranged on or on a mobile unit, wherein the mobile unit can be designed, in particular, as a land vehicle and / or aircraft and / or trailer. The mobile unit may be an agricultural working machine, for example a tractor or an (autonomous) field sprayer. The device can be mounted on a hydraulic device of the agricultural machine. It is also conceivable that the device is constructed on a loading surface of the agricultural machine. Alternatively, the device to the agricultural

Working machine are attached.

The spreading of the spray is preferably carried out in a field. Under a field may in the present case an agricultural area, a

Acreage for plants or a plot of such area or

Acreage to be understood. The field can thus be arable land, a grassland or a pasture. For example, the plants can

Crops whose fruit is used for agriculture (for example as food, feed or energy crop) and weeds or

Include weeds.

The spray may comprise or be a crop protection agent, in particular a diluted crop protection agent. Accordingly, the spray can, for example, comprise or be a herbicide, fungicide or insecticide. The spray However, it may also have or be a fertilizer, in particular a liquid fertilizer and / or a growth regulator.

The mixed spray and the dispensed or dispensed spray must not necessarily be identical. That is, in other words, that the spray can be changed after mixing and before delivery, for example in its concentration. In this case, the spray can thus be further diluted by means of a further mixing unit. At least one of the active ingredients may comprise or be a crop protection agent or a pesticide concentrate. Accordingly, the active agent may comprise or may be, for example, a herbicide, fungicide or an insecticide. However, the active agent may also comprise or be a fertilizer or fertilizer concentrate, in particular a liquid fertilizer and / or a growth regulator. The active agent can be formed as a liquid or as a solid, for example in the form of granules.

However, the active agent may also comprise or be a carrier liquid, in particular water. In the context of the present invention, a carrier liquid can be understood as meaning a liquid which is designed to be mixed with a plant protection product or pesticide concentrate or fertilizer or fertilizer concentrate

Allowing or dispensing the pesticide or fertilizer or to improve the dispensing or dispensing. It is conceivable that a pesticide concentrate or fertilizer concentrate is diluted with the carrier liquid. It is also conceivable that a pesticide or fertilizer present as a solid or granules is suspended in the carrier liquid. It is also conceivable that a in the

Carrier liquid non-soluble crop protection agent or fertilizer is emulsified in the carrier liquid.

Preferably, the mixing unit to be supplied via the throttle unit or supplied active agent is a plant protection agent, in particular a

Pesticide concentrate, and the other of the mixing unit to be supplied or supplied active agent a carrier liquid, in particular water. In the context of the present invention, a mixing unit can be understood to mean a unit which is designed to mix at least two active agents to be mixed with one another into a spray agent. The mixing unit can have a mixing and / or stirring element in order to actively mix the active agents to be mixed with one another. The mixing unit may have at least one inlet each for the active agents to be mixed or a common inlet in the form of a T-piece. The mixing unit may have at least one outlet for the mixed spray. It is also conceivable that the mixing unit is a static mixer or a static mixer. However, the mixing unit can also be designed only as a T-piece, so that a passive mixing takes place in it. Preferably, the mixing unit may be formed, a liquid agent with a carrier liquid,

especially water, to a diluted spray with a defined mixing ratio to mix.

The at least one active agent is supplied to the mixing unit under pressure. Both active agents are preferably fed to the mixing unit under pressure. The pressure can be an overpressure or a negative pressure (relative to the environment). In other words, that the active agent or agents can be supplied to the mixing unit by means of a pressure force or a suction force. For this, the

Device having at least one printing unit, which is adapted to supply the at least one active agent, in particular both active agents of the mixing unit under pressure. The printing unit can be designed or set up to generate an overpressure on the inlet channel. The overpressure may depend on the set throttle channel or on its channel cross section. The printing unit may comprise at least one pump unit. The pump unit may be configured to pump or direct an agent out of a tank and to supply the mixing unit under pressure by means of at least one fluidic conduit, such as a tube, a hose, a conduit or a tube. Alternatively or additionally, the

Pressure unit also comprise a compressed air unit, so that the at least one active agent or both active agents are conveyed or directed by pressurizing the corresponding active agent and / or the corresponding tank with compressed air. However, the pressure unit may also be designed or configured to generate a negative pressure at the inlet channel. For this purpose, the printing unit can comprise at least one pump unit. The pump unit can be designed to suck an active agent from a tank into the mixing unit. For this purpose, the printing unit can be arranged downstream of the mixing unit.

The throttle unit is configured, one of the mixing unit under pressure

to set to be supplied constant flow rate or volume flow (> 0) of the at least one active agent. That is, in other words, that the throttle unit is configured to supply the flow rate to be supplied to the mixing unit.

Volume flow of at least one active agent to a constant

Restrict flow. For this purpose, the throttle unit on an inlet channel and a drain channel, which via at least one throttle channel in

Depending on a position of a relative to the inlet channel and the drain channel movably arranged throttle element of the throttle unit are fluidically connected to each other, wherein the at least one throttle channel is arranged on the throttle element and has a fixed channel cross-section. The throttle element may also be designed to close the throttle passage depending on its position.

The throttle unit is thus connected upstream of the mixing unit. That is, in other words, the throttle unit is arranged upstream of the mixing unit. It is conceivable that both active agents preceded by one each

described throttle unit of the mixing unit can be fed. In this case, the throttle units may have a different number of throttle channels and / or different channel cross sections. However, it is also conceivable that the other active agent can be supplied to the mixing unit via a throttle valve of a different kind. The simplest type would be, for example, a throttle valve as a simple, longer cross-sectional reduction with a defined diameter. The narrowed cross-section or pipe section can theoretically be any shape such as. also assume a gap, the hydraulic cross section

is crucial.

The throttle element is preferably designed to be manually movable for a user. More preferably, the entire throttle unit is a manual valve educated. Accordingly, the throttle unit can be actuated without current. That is to say, in other words, that the throttle unit may be configured such that it has no motor and / or power connections. The throttle element of the throttle unit is preferably designed to be manually movable for a user. It is particularly advantageous if the entire throttle unit is designed as a manual valve. Accordingly, the throttle unit can be actuated without current. That is to say, in other words, that the throttle unit may be configured such that it has no motor and / or power connections.

The throttle channel is also designed to be movable due to its arrangement on the throttle element. As a result, a fluidic connection between the inlet channel and the outlet channel can be established or interrupted depending on the position of the throttle element or the throttle channel.

The throttle channel has a fixed channel cross-section. In other words, the throttle channel has a channel cross-section with fixed or non-adjustable dimensions. The dimensions of the

Throttling channels are thus pressure independent. The channel cross section is the cross section of the throttle channel, which can be flowed through by the active agent or is flowed through during the supply. Of course, the throttle units or the channel cross sections and the set pressures with which the active agents of the mixing unit by means of the printing unit (s) are supplied, must be coordinated with each other to obtain a desired mixing ratio. The flow rate depends on the viscosity of the fluid, the pressure and the hydraulic diameter. At almost the same viscosity and pressure, the flow rate is proportional to the area flowed through (apart from frictional effects) - if, for example, a concentration of the active agent of 10 ml in II water is sought, then the area flowed through by the active agent must be 0.01 times that of the Be water. For the channel cross-section of the throttle channel then results in a ratio of 1 to 10. The pressures can (for both sides or active agents as equal as possible) between 1 and 10 bar (typical for field sprayers). If not exactly the same pressures would still check valves between the

Throttling units and the T-piece are inserted to a backflow

(Mixing) to prevent the tanks. Another possibility arises when one chooses the pressures equal to the ambient pressure. This automatically ensures the same pressures in both tanks. The

The driving force for the flow through the throttle units is then a negative pressure below the mixing unit. "If, for example, the mixed active ingredient is sucked out with a pump, the mixing unit automatically fills up again.

The invention makes use of the fact that spraying before the

Application in (pre-) mixers of a spray device in a solid

Mixing ratio are mixed. The device of the invention now provides a structurally very simple and cost-effective solution to a auszubringendes spray with predefined mixing ratios or

To mix concentrations. This is achieved, in particular, in that the mass flow flowing through the throttle unit is at least one of the

Active agent is not pressure-controlled, but rather by means of movable fixed throttle channels or throttle channels is set with a fixed channel cross-section. The throttle channels are dimensioned according to the desired flow rates, so that, as required - by appropriate positioning of the throttle element - the corresponding throttle channel is adjustable. Accordingly, by means of the throttle unit from a certain overpressure, which depends on the selected throttle channel, pressure-independent, the flow rate of the first active agent are always kept constant, so that a complex control or regulation of the pressure unit or pump

can be waived. This in turn creates the opportunity for that

Throttle element of the throttle unit for a user manually movable and thus form the entire throttle unit as a manual valve.

It is advantageous if at least one further throttle channel is provided, which is arranged on the throttle element and has a fixed channel cross-section.

In this case, it is particularly advantageous if the inlet channel and the outlet channel are simultaneously fluidically connectable to one another via one and / or both throttle channels as a function of the position of the throttle element. Advantageously, the throttle channels have different channel cross sections, in particular diameter. By this measure, a variety of possible variations to adjust a desired constant flow rate, without increasing the complexity of the device.

It is also advantageous if the throttle channel as a bore or the

Throttle channels are each formed as holes / are. As a result, throttle channels can be provided or realized in a very simple manner. It is also advantageous if the throttle channel is curved around a

Rotary axis of the throttle element or extends linearly along a direction of movement of the throttle element and / or the throttle channels are arranged arcuately about an axis of rotation of the throttle element or linearly along a direction of movement of the throttle element. It is particularly advantageous if the movement of the throttle element is a rotary, in particular purely rotational movement about an axis of rotation of the throttle element or a translational, in particular purely translational movement transversely to a flow direction of the active agent through the throttle channel. Preferably, the axis of rotation of the throttle element extends outside the throttle channel or the throttle channels and / or substantially parallel to a flow direction of the active agent through the throttle channel. By this measure, the position of the throttle element can be selected or changed in a very simple manner and thereby set the desired throttle channel.

It is also advantageous if the inlet channel to a feed element and the drain channel are arranged on a drain element, wherein the inlet element and the drain member are formed substantially the same. It is particularly advantageous if the inlet element, the throttle element and the drainage element are formed as disks, in particular equal circular disks and are further arranged adjacent to each other in parallel. As a disc material, a ceramic is preferred due to the low tendency to wear with relatively good tightness (smooth surfaces). Here is the

Throttle unit formed as a kind (turret) drum, so that by turning, in particular manual rotation of the throttle element of

corresponding throttle channel can be set or selected. Furthermore, it is advantageous if

- The inlet element and / or the drainage element resiliently against the

Throttle element is arranged and

the throttle element has at least one projection on a surface facing the inlet element and / or the drainage element, by means of which the throttle element is guidably mounted in a groove of the inlet element and / or the drainage element, and / or the throttle element is attached to the inlet element and / or the drainage element Drain-facing surface has a groove, by means of which the throttle element is mounted on at least one projection of the inlet element and / or the drain element feasible.

By the combination of a projection, for example in the form of a hemisphere, on one of the elements and an opposite circumferential groove or groove on an adjacent element, a fixation of the elements relative to one another in the radial direction is thus made possible. The groove may advantageously have depressions, for example in the form of half-shells, in order to arrest the elements relative to each other in the circumferential direction in predetermined positions or

To allow angles. Since the projections protrude into the recesses and are thus larger than the grooves, the distance increases during the movement of the throttle element or the projection from one recess to the next the distance to the feed element or the drain element, so that the wear on the contact surfaces is avoided.

Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. It shows:

Fig. 1 is a schematic representation of a device according to the invention for dispensing a spray agent; Fig. 2-4 is a schematic representation of an embodiment of the

Throttle unit of Fig. 1;

5 is a schematic representation of a further embodiment of a throttle unit with a lock; Fig. 6, 7 are schematic representations of two further embodiments of throttle units with an elongated throttle channel; and

8 is a flowchart of a method according to a

Embodiment.

In the following description of advantageous embodiments of the present invention are for the in the various figures

represented and similar elements acting the same or similar

Reference numeral used, wherein a repeated description of these elements is omitted.

Fig. 1 shows an inventive device for dispensing a

Spray or spray device according to the invention, which is provided in its entirety by the reference numeral 10.

The injection device 10 has a mixing unit 12, a throttle unit 14 and a throttle valve 16. The injection device 10 further comprises a tank 18, in which a first active agent 20 is arranged, and a tank 22, in which a second active agent 24 is arranged on. Here, the first active agent 20 as pesticide concentrate 20 and the second active agent 24 as

Carrier liquid 24, namely water 24 is formed.

The first active agent 20 and the second active agent 24 can be supplied under pressure via supply lines 26 of the mixing unit 12, wherein the pressure can be generated via a respective pressure unit 28. The mixing unit 12 in turn is designed to mix the two active agents 20, 24 into a spray agent 30.

The throttle unit 14 is disposed upstream of the mixing unit 12 between the tank 18 and the mixing unit 12. The throttle unit 14 has an inlet channel 32 and an outlet channel 34, which can be fluidically connected to each other via one of four throttle channels 36a, b, c, d in order to set a flow of the first active agent 20 to be supplied to the mixing unit 12. The inlet channel 32 is connected to a feed element 33 and the

Outflow channel 34 disposed on a drain element 35. The throttle channels 36a, b, c, d are in this case at a relative to the inlet channel 32 and

Feed element 33 and the drain channel 34 and drain element 35 movably arranged throttle element 38 and each have a fixed channel cross-section. The channel cross sections are different here, as can be seen from the following figures. The fluidic connection or the choice of the throttle channel 36a, b, c, d and thus the flow rate thus takes place in dependence on a position of the throttle element 38. By means of

Throttle unit 14 can in this case from a certain pressure, which also depends on the selected throttle channel 36a, b, c, d, regardless of pressure, the flow rate through the flow of the first active agent 20 are always kept constant. Here, the throttle element 38 is formed manually movable for a user, which is why the throttle unit 14 is formed as a manual valve 14.

The throttle valve 16 is formed as a pipe constriction. However, it would also be quite conceivable that instead of the throttle valve 16 and another

Throttle unit is provided, but with a different number of throttle channels and / or different channel cross-sections. Accordingly, the second active agent 24 can be supplied via the fixed throttle valve 16 of the mixing unit 12 under pressure, wherein the constant flow rate, in contrast to the throttle unit 14 is not variable.

Thus, depending on the desired mixing ratio of the spray agent 30, i. the first active agent 20 or the pesticide concentrate 20 to the second active agent 24 or water 24, the throttle element 38 and thus the respective throttle channel 36a, b, c, d are positioned accordingly, so that the corresponding flow rate of the pesticide concentrate 20 of the mixing unit 12 in proportion is supplied to the water 24. The

Throttle unit 14 and the throttle valve 16 and the pressures at which the active agents 20, 24 of the mixing unit 12 are supplied, of course, must be coordinated with each other to obtain the desired mixing ratio.

In Fig. 2 to 4 is an embodiment of an inventive

Throttle unit 14 shown. The inlet element 33, the drain element 35 and the throttle element 38 are formed as circular discs and parallel arranged adjacent to each other. The throttle element 38 is rotatably mounted in the direction of movement 40 about a rotation axis 42. During the movement of the throttle element 38, this is a purely rotational movement. The axis of rotation 42 in this case extends outside the throttle channels 36a, b, c, d, so that the throttle channels 36a, b, c, d are also rotatable about the axis of rotation 42 movable. Furthermore, the axis of rotation 42 of the throttle element 38 extends substantially parallel to the flow direction 44 of the active agent through the throttle channels 36a, b, c, d.

As can be seen in more detail from the exploded view of FIG. 3, a fluidic flow takes place as a function of the position of the throttle element 38

Connection of the inlet channel 32 with the drainage channel 34 via one of

Throttle channels 36a, b, c, d in the flow direction 44. Here, the bores 36a, b, c, d formed throttle channels 36, a, b, c, d all fixed

Channel cross-sections, whereby the flowing through flow rate is kept constant. The channel cross-sections or diameters of the throttle channels 36a, b, c, d are different, so that depending on the desired ratio of the pesticide concentrate 20 to the water 24 by turning the throttle element 38 in the direction of movement 40 of the corresponding

Throttle channel 36a, b, c, d (in the case shown 36a) for the fluidic connection is selectable. In this case, the inlet channel 32 and the outlet channel 34 can be fluidly connected simultaneously via only one throttle channel 36a, b, c, d. However, it is also quite conceivable, the diameter and arrangement of the channels 32, 34,

36a, b, c, d are selected such that the inlet channel 32 and the outlet channel 34 via two or more throttle channels 36a, b, c, d are simultaneously fluidly connectable.

FIG. 4 shows a detailed view of the elements 33, 35, 38, from which it can be seen that the throttle channels 36a, b, c, d are arranged in a circle about the axis of rotation 42 of the throttle element 38.

Fig. 5 shows a further embodiment of an inventive

Throttle unit 14 with a locking of the throttle element 38 in predetermined positions, ie a locking of the throttle element 38 relative to the Feed element 33 and the drain element 35 at predetermined angles. For illustrative reasons, a detail view is analogous to FIG. 4 shown.

In order to provide the lock, the inlet element 33 and the drain member 35 are each arranged by means of a (not shown) compression spring resiliently against the throttle element 38 and stored. Furthermore, the inlet element 33 and the drainage element 35 each at one

Throttle element 38 facing surface 48 has a circular groove 50 and groove 50 with four circumferentially evenly distributed hemispherical

Depressions 52. Accordingly, the throttle element 38 has four hemispherical projections 56 each on a surface 54 facing the inlet element 33 and the outlet element 35. The hemispherical projections 56 are distributed uniformly in the circumferential direction analogous to the hemispherical depressions 52. Consequently, the throttle element 38 by means of

Projections 56 in the grooves 50 and the recesses 52 of the inlet element 33 and the drain member 35 is mounted and lockable executable. When the throttle element 38 is rotated from a locking position, the distance to the inlet element 33 and the outlet element 35 increases in each case until reaching the next locking position, so that wear on the contact surfaces 48, 54 is avoided. In addition, the inlet channel 33 and the

Drain passage 35 by means of a sealing element, for example. Be sealed an O-ring.

6 and 7 show two further embodiment of a throttle unit 14 'with only one throttle channel 36'. The throttle channel 36 'is in this case elongated and extends arcuately about the axis of rotation 42 of the throttle element 38'. The inlet channel 32 of the inlet element 33 and the outlet channel 34 of the

Drain element 35 are adapted accordingly. In this case, the mass flow of the active agent 20 flowing through is determined by an overlapping surface 58 of the throttle channel 36 'with the inlet channel 32 or the outlet channel 34. The flow rate is thus continuously variable or adjustable. As shown in Fig. 6, the channels 32, 34, 36 'may be formed symmetrically, so that per angular unit, a uniform increase in the

Overlap surface 58 results. Alternatively, however, the channels 32, 34, 36 ' also - as shown in Fig. 7 - be formed asymmetrically, so that per angle unit results in a different increase in the overlap surface 58.

3 shows a flow chart of an embodiment of the present invention

The method 100 comprises a step 102 of providing a mixing unit 12 for mixing two active agents 20, 24 into a spraying means 30. The method 100 further comprises a step 104 of providing a throttle unit 14; 14 'with an inlet channel 32 and an outlet channel 34, which via at least one

Throttle channel 36a, b, c, d; 36 'in response to a position of a relative to the inlet channel 32 and the drain passage 34 arranged movable

Throttle element 38; 38 'of the throttle unit 14; 14 'are fluidically connectable to each other to set a mixing unit 12 to be supplied flow rate of at least one of the active means 20, 24, wherein the at least one throttle channel 36a, b, c, d, 36' on the throttle element 38; 38 'is arranged and has a fixed channel cross-section in order to keep constant the flow rate of the at least one active agent 20, 24. The method 100 further comprises a step 106 of feeding at least one of the active means 20, 24 of the mixing unit 12 via the throttle unit 14; 14 'under pressure such that the mixing unit 12 to be supplied flow rate of the at least one active agent 20, 24 by means of the throttle unit 14; 14 'is kept constant. The method 100 finally comprises a step 108 of discharging the spray agent 30.

If an exemplary embodiment comprises an "and / or" link between a first feature and a second feature, then this is to be read so that the embodiment according to one embodiment, both the first feature and the second feature and according to another embodiment either only first feature or only the second feature.

Claims

claims

1. Device for dispensing a spray (30), in particular one

Plant protection agent (30), comprising a mixing unit (12) for mixing two active agents (20, 24) into a spray (30), wherein at least one of the

Active means (20, 24) via a throttle unit (14, 14 ') of the mixing unit (12) can be supplied under pressure, wherein the throttle unit (14, 14') has an inlet channel (32) and a drain channel (34), which over at least a throttle channel (36a, b, c, d; 36 ') in response to a position of a throttle element (38; 38') of the throttle unit (14; 14 ') movably arranged relative to the inlet channel (32) and the outlet channel (34) fluidically connectable to one another to set a flow of the at least one active agent (20) to be supplied to the mixing unit (12), characterized in that the at least one throttle channel (36a, b, c, d; 36 ') is connected to the throttle element (38; ') is arranged and has a fixed channel cross-section in order to keep constant the flow rate of the at least one active agent (20, 24).

2. Device (10) according to claim 1, characterized by at least one

another throttle channel (36a, b, c, d) which is arranged on the throttle element (38) and has a fixed channel cross-section.

3. Device (10) according to claim 2, characterized in that the

Supply channel (32) and the discharge channel (34) in dependence on the position of the throttle element (38, 38 ') via one and / or both throttle channels (36a, b, c, d, 36') are simultaneously fluidly connected to one another.

4. Device (10) according to claim 2 or 3, characterized in that the

Throttling channels (36a, b, c, d) have different channel cross-sections, in particular diameter.

5. Device (10) according to one of the preceding claims, characterized

characterized in that the throttle channel (36 ') as a bore (36') or the

Throttling channels (36a, b, c, d) in each case as bores (36a, b, c, d) is / are formed.

6. Device (10) according to any one of the preceding claims, characterized in that the throttle channel (36 ') arcuately around a

Rotary axis (42) of the throttle element (38 ') or linear along a

Movement direction of the throttle element (38 ') extends and / or the

Throttle channels (36a, b, c, d) circular about an axis of rotation (42) of the

Throttle element (38) or linear along a direction of movement of

Throttle element (38) are arranged.

7. Device (10) according to one of the preceding claims, characterized

characterized in that the movement of the throttle element (38, 38 ') is a rotational, in particular purely rotational, movement about an axis of rotation (42) of the throttle element (38, 38') or a translatory, in particular purely translational, movement transverse to a flow direction (44) of the throttle body Active agent (20; 24) through the throttle channel (36a, b, c, d; 26 ').

8. Device (10) according to claim 7, characterized in that the

The axis of rotation (42) of the throttle element (38, 38 ') extends outside the throttle channel (36a, b, c, d; 36') or the throttle channels (36a, b, c, d).

9. Device (10) according to claim 7 or 8, characterized in that the

Rotary axis (42) of the throttle element (38, 38 ') substantially parallel to a flow direction (44) of the active agent (20, 24) through the throttle channel

(36a, b, c, d; 26 ').

10. Device (10) according to one of the preceding claims, characterized

in that the inlet channel (32) on an inlet element (33) and the outlet channel (34) on a drainage element (35) are arranged, wherein

Inlet element (33) and the drainage element (35) are formed substantially the same.

11. Device (10) according to claim 10, characterized in that the

Feed element (33), the throttle element (38, 38 ') and the drainage element (35) are formed as discs, in particular circular discs and are further arranged adjacent to each other in parallel.

12. Device (10) according to claim 10 or 11, characterized in that

- The inlet element (33) and / or the discharge element (35) is resiliently arranged against the throttle element (38, 38 ') and

- The throttle element (38, 38 ') on a the feed element (33) and / or the drain member (35) facing surface (54) has at least one projection (56), by means of which the throttle element (38, 38') in a groove (50) of the inlet element (33) and / or of the outlet element (35) is guide-mounted, and / or the throttle element (38, 38 ') on a feed element (33) and / or the drain element (35) facing surface (54 ) has a groove (52), by means of which the throttle element (38, 38 ') on at least one

Projection (56) of the inlet element (33) and / or the drainage element (35) is guidably mounted.

13. Device (10) according to one of the preceding claims, characterized

in that the throttle element (38, 38 ') is designed to be manually movable for a user, and in particular the throttle unit (14, 14') is designed as a manual valve (14, 14 ').

14. Device (10) according to one of the preceding claims, characterized

characterized in that the at least one active agent (20, 24) a

Plant protection agent (20), in particular a pesticide concentrate (20) and / or a carrier liquid (24), in particular water.

15. A method for applying a spray (30), in particular a

Plant protection product (30), with the steps:

- Providing (102) a mixing unit (12) for mixing two active agents (20, 24) to a spraying means (30);

- Providing (104) a throttle unit (14, 14 ') with an inlet channel (32) and an outlet channel (34), which via at least one throttle channel (36a, b, c, d; 36') in dependence on a position of a relative to the inlet channel (32) and the outlet channel (34) movably arranged throttle element (38; 38 ') of the throttle unit (14; 14') are fluidically connected to one another, the mixing unit (12) to be supplied flow rate of at least one of the active means (20, 24), wherein the at least one throttle channel (36a, b, c, d; 36 ') is arranged on the throttle element (38, 38') and has a fixed channel cross-section has, in order to keep constant the flow rate of the active agent (20, 24);

- Feeding (106) of the at least one active agent (20, 24) of the mixing unit (12) via the throttle unit (14, 14 ') under pressure such that the mixing unit (12) to be supplied flow of at least one active agent (20, 24) is kept constant by means of the throttle unit (14; 14 '); and

- spreading (108) of the spray (30).

16. Use of a throttle unit (14, 14 ') for setting a constant flow rate of an active agent (20, 24) to be supplied to a device (10) for dispensing a spray (30), wherein the throttle unit (14, 14') ) has an inlet channel (32) and an outlet channel (34), which via at least one throttle channel (36a, b, c, d; 36 ') in dependence on a position of a relative to the inlet channel (32) and the outlet channel (34) movably arranged throttle body (38; 38 ') of the throttling unit (14; 14') can be connected to one another in order to set a flow of the at least one active agent (20, 24) to be supplied to the mixing unit (12), wherein the at least one throttling channel (36a, b, c, d; 36 ') is arranged on the throttle element (38, 38') and has a fixed channel cross section in order to move the

flowing through flow rate of the active agent (20, 24) to keep constant.