EP0682987A2 - Fluid dispenser - Google Patents

Abstract

The delivery device has an outlet channel (11,12) which flows into the working medium outlet (13) and determines the medium flow. The outlet channel has a section for connection to pressure chambers (8,9), located at a distance from the outlet channel and providing a delivery pressure, and determines the flow passage. At least one core body is provided for at least one outlet channel for inflow of working medium flow and is pressure-dependently controlled. <IMAGE>

Description

The invention relates to a discharge device for one or more media, at least one of which is not gaseous, e.g. liquid, powder or the like and / or at least one gaseous, e.g. Air that can be. The discharge device can only be formed by a discharge head for attachment to a pressure generator, such as a push piston pump, a squeeze or bellows pump or the like, or it can form a structural unit with such a pressure generator or an associated media store.

The discharge device has one or more media outlets, outlet channels, volume-variable chambers for manual pressure generation, valves or flow-changing actuators or the like, which guide the medium as soon as the pressure chamber is narrowed by direct manual actuation or by pressure chamber charged before actuation under delivery pressure the manual actuation to the outlet duct is opened.

There is a need to influence the flow behavior at a distance before, in the area or after the media outlet. For example, the media flow can be influenced during the course of a single discharge process in order to adapt to changes in the delivery pressure, or it can be influenced in order to achieve the most accurate possible metering of the discharge quantity per discharge process.

The invention has for its object to provide a discharge device in which disadvantages of known designs avoided or compared to these advantages, e.g. Advantages of the type mentioned are to be achieved and which, in particular in the case of a simple design, enables the media flow to be influenced as desired after leaving the pressure chamber at any point between this pressure chamber and the media outlet adjacent to the outside.

A core or other actuating body for changing the media flow can be provided in such a way that, as the delivery pressure increases due to a movement, a restriction or the like of a passage cross section or a subsequent further movement is possible. The passage cross section or the further movement can be changed by a separate manual actuation in such a way that the respective setting is retained regardless of the actuation or of the delivery pressure and / or it can be path-dependent on the actuation or pressure-dependent, namely automatically as a result of the aforementioned Discharge actuation of the discharge device may be provided.

If at least one media outlet is formed by a relatively narrow nozzle of less than 8, 4 or 1 mm, in particular by an atomizer nozzle, the flow paths of which form a nozzle geometry which influences the flow behavior, so Regardless of the design described, an actuator for changing this nozzle geometry can be provided so that passage cross sections of the discharge nozzle can be changed. The changes can always leave passage cross sections free or also completely close the outlet channel so that at least one medium is blocked against access to the medium outlet.

The actuating body can also serve to change the flow geometry and therefore the flow-influencing effect of a swirl or swirl chamber in which separate media for mixing or the like are brought together or converted into swirled or rotating flows.

In particular, an actuating body can have an essentially flat or at most flat obtuse-angled end face or control surface adjacent to an inner and / or outer circumference, which can be moved by the actuating movement relative to a correspondingly designed counter surface and, with this, delimits a disk-shaped, flat, but variable passage gap . A longitudinal channel which adjoins the outer circumference of this passage gap can remain essentially unchanged or changed by the actuating movement with regard to its flow-influencing effect or its passage cross-sections.

It is particularly expedient if at least two passage cross sections, which are spaced in the conveying direction or immediately following one another and can be changed by the actuating movement, are provided and are changed in opposite directions. If one passage cross section is enlarged or if it causes a quieter flow, the other is expediently reduced or if it causes a more turbulent or faster flow and vice versa. The arrangement is advantageously provided that when discharge is conveyed, the first passage cross section is increased in flow direction and the second is narrowed, or that the reverse movement occurs in the return movement.

The path of an actuator from the starting position to the end position can also be used for metering or limiting the discharge quantity or for ending the discharge despite actuation of the discharge device and therefore the delivery pressure prevailing in the pressure chamber, although e.g. a pressure-dependent opening exhaust valve is fully open. For this purpose, an expanded, annular or disk-shaped intermediate chamber is expediently provided between the valve seat and a narrow flow channel connecting in the direction of flow, into which the medium enters directly from the valve seat and into which the valve or actuating body can also penetrate.

Such an intermediate chamber or another chamber can also be designed as a pump or displacement chamber which can be changed in volume by an actuating body and from which the medium is displaced when the actuating body moves, so that additional conveying energy is thereby caused. In this way or by other means, an actuating body can cause the media discharge to begin suddenly with the maximum discharge energy and / or to be stopped suddenly, so that there is not a slowly increasing or decreasing discharge, but rather a sudden discharge of the medium. This is particularly advantageous for a finely atomized discharge in order to also ensure the finest atomization at the beginning or end of the discharge. The media outlet can also be formed by a foam nozzle, in the area of which a foamable medium is foamed, possibly with the addition of gas, wherein the foam formation can be influenced by an adjusting body.

The actuating body can be driven by a piston or the like via an intermediate drive, but it is expediently connected to this piston rigidly or in one piece, so that it is inevitably, simultaneously or synchronously carried along and results in a direct mechanical drive. The actuating body can be formed by the piston and this by a valve body.

An actuating body can have any of the configurations and effects mentioned in any combination or separate actuating bodies can be provided for this. It is particularly useful if the actuating body with a bearing, a valve seat, a return spring, a piston or valve body, a closure for the pressure chamber or the like., Forms a preassembled module which is subsequently attached to the housing forming the pressure chamber, the one Media outlet having discharge head or the like. To be mounted and expediently clamped between the last two modules mentioned.

It is particularly expedient if a second medium flow or a second medium is supplied to the first medium flow in the area of an actuating body or in the flow direction, this second medium having a different physical state than the first medium, e.g. can be gaseous. As a result, the atomization or foaming can be substantially improved or the supply of the second medium to the media outlet or the like can begin before the corresponding supply of the first medium or can end after the supply of the second medium has ended.

Fig. 1

eine erfindungsgemäße Austragvorrichtung im Axialschnitt,

Fig. 2

einen Ausschnitt der Fig. 1 in wesentlich vergrößerter und abgewandelter Ausbildung,

Fig. 3

einen Schnitt durch die Anordnung nach Fig. 2 in abgewandelter Ausbildung und

Fig. 4

eine weitere Ausführungsform in einer Darstellung entsprechend Fig. 2.

These and other features emerge from the description and the drawings in addition to the claims, wherein the individual features can be realized individually or in groups in the form of sub-combinations in one embodiment of the invention and in other areas and can represent advantageous and protectable embodiments for which protection is claimed here. Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:

Fig. 1

a discharge device according to the invention in axial section,

Fig. 2

2 shows a section of FIG. 1 in a substantially enlarged and modified design,

Fig. 3

a section through the arrangement of FIG. 2 in a modified design and

Fig. 4

a further embodiment in a representation corresponding to FIG. 2.

The discharge device 1 has a base body 2 and an insert body 3 supported thereon for attachment to the narrowed neck 5 of a container 4, the container space of which is provided as a media store for storing two separate media, for example a liquid and air. The container 4 is a squeeze bottle yielding resiliently by manual external pressure on the jacket and / or at least one end face with flexible plastic walls, but can also be dimensionally stable or contain a propellant that generates the delivery pressure, such as an aerosol.

Due to the compressibility, the container 4 forms a type of balloon pump, the pressure chamber 8 of which is formed by the storage space for the entire media supply can be changed in volume manually. Within the pressure chamber 8 there is a further pump 7, acting in the same way, for the second medium air, the pressure chamber 9 of which is formed by a foil bag which, with complete emptying, can be folded non-destructively so that its volume only corresponds approximately to the material volume of its walls. The pressure chamber 9 is refilled with air from the outside in such a way that the pressure chamber 8 does not take up air, regardless of its filling state, but is always full. Delivery of the first medium from the pressure chamber 8 or subsequent resetting of the container walls leads to a corresponding enlargement of the pressure chamber 9 with simultaneous air intake from the outside.

An outlet channel 11 leads from the pressure chamber 8 through the neck 5 and the bodies 2, 3. An essentially separate outlet channel 12 leads from the pressure chamber 9 at a distance from the neck 5 through a wall of the container 4 and the base body 2. The outlet channels 11 , 12 open into a common media outlet 13, but are already brought together beforehand, so that the two media emerge mixed from the media outlet 13, which is provided in an exposed outer surface of the base body 2 and from which the respective medium leaves the device 1 completely. The media outlet 13 is formed by the outer end 16 of a nozzle or end channel 14, the diameter of which may be less than 1/2 mm or 1/10 mm. The cylindrical end channel 14 has a length that is at most 3 to 5 times greater than its smallest width and is widened in a funnel shape at both ends 15, 16 or passes through to at least one of these ends with a constant inner width.

In the outlet channel 11, three flow restrictors or valves 17, 18, 19 are provided in succession in the flow direction, which act on the entire media flow in the outlet channel 11, either for opening and closing or only for increasing and decreasing the passage cross sections. All valves 17 to 19 are actuated simultaneously by a single actuating body 20 which has a core body 21 which is closer to the end channel 14 and a valve body 22 which adjoins this in a rigid or axially movable connection. On the side facing away from the core body 21, the valve body 22 has a stem 23 which projects into the neck 5 belonging to the pressure chamber 8 and which carries a disk-shaped abutment 24 for a return spring 25 at the inner end. The spring 25 surrounding the shaft 23 is supported at one end on the abutment 24 and at the other end on the inner end face of the insert body 3 approximately in the plane of the outer end face of the neck 5.

The annular disk-shaped insert body 3, which may be formed in one piece with the base body 2, forms a frusto-conical valve seat 26 which is expanded at right angles in the direction of flow and is provided as the inner circumference for the closing engagement of a similarly frustoconical closing surface 27 on the outer circumference of the disk-shaped valve body 22. The valve seat 26 is a Conical frustum in the neck 5 protruding collar of the otherwise flat insert body 3 is formed, which is clamped between the base body 2 and the end of the neck 5 so that it simultaneously forms the bottle cap or the seal between the container opening and base body 2. In the starting position or when the pump 6 is not actuated, the valve 17 is tightly closed. The valve body 22 forms a control piston which is exposed to the pressure in the pressure chamber 8 and which is at excess pressure in the pressure chamber 8, the valve 17 opens by displacing the actuating body 20 in the flow direction, so that a continuous passage gap for the medium is then formed between the surfaces 26, 27.

In the starting position, the valve 18 or 19 is most widely opened and in the most open position of the valve 17 is most narrowed or completely closed. In the starting position, the annular, flat valve seat 28 of the valve 18 lies opposite the larger and also annular disk-like flat end face of the valve body 22 and is formed by an annular recess on an inner end face of the base body 2. The closing surface 29 of this valve 18 is formed by the aforementioned end surface of the valve body 22, the valve seat 28, on the other hand, having a larger outside width. The valve seat 26 thus directly adjoins the annular disk-shaped gap 34 between the valve surfaces 28, 29, which is also penetrated by the core body 21. The greatest width of the valve seat 26 thus corresponds to the greatest width of the valve seat 28.

In contrast, the valve 19 has much narrower valve surfaces 30, 31, namely on the base body 2 a valve seat 30 and opposite this a closing surface 31 which is formed by the outermost end surface of the core body 21 facing away from the valve body 22. The valve surfaces 30, 31 are also essentially flat and annular in shape. The valve seat 30 surrounds the inner end 15 of the end channel 14, which passes through a one-piece end wall 37 of the base body 2. In the starting position, a further, annular disk-shaped passage gap 35, the axial gap width of which is not penetrated by any components within its outermost circumference, is delimited between the valve surfaces 30, 31 depending on the requirements may be the same, larger or smaller than that of the passage gap 34. With a smaller gap width of the passage gap 35, the closing surface 31 abuts the valve seat 30, so that the gap 34 with the narrowest passage cross section remains open despite valve 19 which may be closed. With a larger gap width, the closing surface 29 strikes, while the gap 35 of the valve 19 remains open in the narrowest state. With the same gap width or the same stop distance, both valves 18, 19 close simultaneously by limiting the stop, but means can be provided in order to keep a minimum passage cross section through the respective valve 18, 19 still free. One to all valves or throttles, their respective respective surfaces, the end channel 14, the media outlet 13, the neck 5 and the actuating body 20 expediently lie essentially in a single central axis 10, with respect to which the container 4 can be provided coaxially or eccentrically.

The core body 21 has a cylindrical circumferential surface 32 which is constant over its entire length and adjoins the end surface 31 and which is opposed by an inner circumferential surface of the base body 2 adjoining the end surfaces 28, 30 as a counter surface 33. According to FIG. 1, an enveloping gap 38 that extends over the circumference and connects the gaps 34, 35 can be delimited between the surfaces 32, 33, or the surfaces 32, 33 can lie against one another in an essentially tight or sliding manner according to FIG. The length of the envelope gap 38 or the engagement of the core body 21 in the associated depression on the inside of the base body 2 in the starting position is greater than the gap width of the gaps 34, 35, so that the core body 21 always engages in the depression. Axial adjusting movements of the core body 21 can have no influence on the passage cross section of the channel section 38 connecting the channel sections 34, 35 or enlarge or reduce it depending on the desired discharge behavior.

The chambers 34, 35 simultaneously form volume-variable pressure or pump chambers, which are narrowed with increasing delivery pressure by the bodies 22, 21 acting in the manner of thrust pistons and thereby expel the medium in the direction of the media outlet 13. The effective piston area of the piston 21 formed by the end face 31 is smaller than the effective piston area 29 or 27, wherein the piston area 27 serving for the opening can be larger than the piston area acting in the opposite direction or approximately the same size. The openings 12 to 16, 35, 38, the surfaces 30, 33 and the wall 37 can also be provided on a separate nozzle cap of approximately constant wall thickness, which is fixed in the base body 2 or is movably inserted to carry out the adjusting movements. The core body 21 then engages in it.

The outlet channel 12 ends in an opening 36, which connects approximately radially or tangentially to the outer circumference of one or more of the gaps 34, 35, 38 and, with the core body 21 in the starting position, is expediently directed only against its circumferential surface 32 or approximately in the middle the length of the peripheral surface 33. Air is drawn into the pressure chamber 9 from the outside via an inlet valve 39 which opens in a pressure-dependent manner and through a section of the outlet channel 12. In the flow direction after the one-way valve 39 closing under positive pressure in the chamber 9, an outlet valve 40, for example a spring-loaded one-way or pressure valve, is arranged in the outlet channel 12, which opens when there is excess pressure in the chamber 9, so that air with a correspondingly high pressure at the Mouth 36 is pending. The mouth 36 can be the same or different in each position of the core body 21 open or closed in one of the positions, for example one or both end positions, such as the starting position. The respective chamber or the respective gap, into which the mouth 36 opens, simultaneously forms a mixing chamber, in which or from which the two media are uniformly mixed with one another by swirling.

In order to further improve the discharge behavior or the mixing, means 41 are expediently provided for influencing the flow, in particular for changing the flow direction, flow speed, flow swirling and flow rotation. For example, the respective chamber 34, 35, 38 can be designed as a swirl chamber, in which one or both media are set in a flow rotation around the central axis 10 such that this rotation continues into the end channel 14, the media outlet 13 and beyond, and thereby at least one swirl device 42, 43 is formed. The respective swirl chamber 34, 35 can be provided on one or both end faces 30, 31 or circumferential surfaces 32, 33 with guide surfaces of the means 41 or the swirl device 42 so that a strong mixing vortex or rotational flow is generated.

Along the circumferential surface 32, axial, groove-shaped longitudinal channels 44 are provided in the core body 21, which open ends connect to the channel section 34 with their one ends in any position or are closed by the valve 18 in at least one position, in particular the end position. The other end of the respective longitudinal channel 44 is angled into a groove-shaped transverse channel 45 in the end face 31, the radially inner end of which is distant from the longitudinal channel 44 opens into a bowl-shaped or cup-shaped recess 46, which is also provided in the end face 31. The bottom of the recess 46 can be in the plane of the bottom surface of the channel 45 lie or in contrast to the end channel 14 or be offset therefrom.

The width of the recess 46 is greater than that of the channels 44, 45 and one flank of each channel 45 connects tangentially to one end of a section of the inner circumference of the recess 46 which is concavely curved about the central axis 10. The passage cross section of the channel 45 is continuously narrowed in a funnel shape to the rotation chamber 46, e.g. through acute-angled convergence of its opposing flanks. The length of the channels 44 or of the core body 21 can be of the order of magnitude of its outer width or, on the other hand, be considerably smaller and the clear width of the chamber 46 is greater than that of the channel sections 14 to 16 or the inner circumference of the valve seat 30. The respective depression 44 to 46 can only be provided in the core body 21 and is then closed or closable on its open groove or recess side by the recess-free surfaces 33, 30 of the base body 2. However, this recess can also be provided exclusively in the surfaces 33, 30 and can be closed or closed accordingly by the recess-free surfaces 32, 31 of the core body 21. Furthermore, the respective depression can also be provided in both associated surfaces.

While the above-mentioned channels or depressions are not provided in the embodiment according to FIG. 1 and therefore the valve 19 is closed in the actuated end position of the core body 21, the valve 19 cannot be completely closed in the embodiments according to FIGS. 2 and 3 , but the line connection from the channels 44 to the media outlet 13 always remains open. In the recess 46, the first medium under centrifugal force into a right-hand rotating flow according to FIG. 3 along the inner circumference and around the Air flowing in the center is displaced, at the same time the first medium emerging in the longitudinal direction from the channels 44 is directed back against the surface 31 and the depressions 45, 46 by bouncing off the surface 30, and in addition the fluidized medium flow thus occurs as the surface 31 or of the depressions 45, 46 to the end channel 14. At the end of this process, the supply of both media to the end channel 14 is abruptly interrupted by closing the valves 18, 19, while in the embodiment according to FIGS. 2 and 3 only the supply of the first medium is abruptly interrupted by closing the valve 18, the second However, medium can still flow out through the end channel 14 and the outlet opening 13, the channels 14 to 16, the chamber 35 and the depressions 44 to 46 can be completely cleaned of the first media.

1, the mouth 36 is directed radially or tangentially with the radial spacing in any position against the circumferential surface of the core body 21. 2, the mouth 36 is directed radially in the starting position against the transition region between the two channels 44, 45, so that air from it in an approximately radial or rectilinear flow enters directly into the transverse channel 45 and then into the recess 46. In the other end position, the mouth 46 is directed almost over its full width only against the bottom surface of the longitudinal channel 44. 3, the opening 36 of the outlet channel 12 opens tangentially to the circumference 32 or 33, which may have a circumferential channel 47 connecting the longitudinal or transverse channels 44, 45, so that the second medium is set into a rotational flow on this circumference and enters two or more channels 44, 45 at about the same time. The rotational flow in the circumferential channel 47 can be provided in the same direction or in the opposite direction to the rotational flow in the depression 46 about the central axis 10. Furthermore, the circumferential channel 47 forming groove recess, as described with the aid of the recesses 44 to 46, is provided exclusively in the surface 32 or the surface 33 or, according to FIG. 3, in both surfaces and is closed on the open recess side. The channel 47 can furthermore be provided only in the area of the longitudinal channels 44, only in the area of the transverse channels 45 or in the transition area between these channels 44, 45. The passage cross section of the channel 47 can be approximately the same size or smaller than that of the outlet channel 12.

In the embodiment according to FIG. 4, the core body 21 is formed directly by the valve body of the valve 17, which on its widest end face 29 does not carry the core projection as shown in FIGS. 1 to 3, but is continuously flat or provided with the depressions 45, 46 is. The chamber 34 is separated from the chamber 35, which has a larger axial extension than it, by an intermediate wall 49, one side of which forms the end face 28 of the valve 18. The other side of the wall 49 facing the end channel 14 carries a projection 48 which projects freely into the chamber 35 and which forms a nozzle 50 lying in the central axis 10. The projection 48 is tapered in the shape of a truncated cone on the outer circumference in the flow direction, inside it is penetrated by a straight-line nozzle channel 51 of approximately constant width throughout and forms at the free end a nozzle opening 53 lying in the axis 10, which is at a distance from the inner end 15 or the end face 30 is opposite, which is approximately the same size or less than half the axial extent of the chamber 35 or as the width of the nozzle opening 53. The circumference of the nozzle opening 53 is delimited by a tear-off or ring edge 52 which is sharp in cross section and which is delimited on the inner circumference by the channel 51 and on the outer circumference by the conical outer surface of the projection 48.

The end channel 14 is continuously extended in the shape of a truncated cone from the inner to the outer end 16, and the width of its inner end 15 is greater than the width of the nozzle opening 53, which is axially aligned with it and upstream at a distance therefrom. The pre-atomizer, formed in one piece with the base body 2, like the end channel 14 Nozzle 50 assumes the same position with respect to end channel 14 in every operating state. The inlet end of the channel 51 facing away from the nozzle opening 53 opens into the valve seat 28. When there is excess pressure in the pressure chamber 8, the valve 17 opens increasingly, while at the same time the valve 18 associated with the inlet of the nozzle 50 increasingly closes. In the chamber 35 opens approximately on the entire axial extent of the outlet channel 12 in the manner described radially and / or tangentially, so that the second medium around the projection 48 is set into an annular rotational flow into which the first medium sprays out of the opening in the center 53 occurs in the gap area formed between the surfaces 30, 52, which causes a strong acceleration of flow. When leaving the opening 53, the first medium can have an identical or opposite rotational flow.

The media mix from the area of the opening 53, are swirled again strongly as they flow along the inner ring edge of the inner end 15, which is also sharply flanked at an acute angle, and emerge at the media outlet 13 as an even more atomized spray cone. The fact that with the nozzle 50 alone the first medium in a first stage, in particular by supplying the second medium, atomized and then both media are atomized again together with the nozzle 14 in a second, separate stage, extremely small and over the result Cross-section of the spray jet evenly distributed atomization particles and it results in these properties a high level of consistency from the start to the end of the discharge process.

The pressure chamber for the respective outlet channel 11 or 12 can also be formed by the cylinder space of a manually operated thrust piston pump that has to be filled repeatedly during the return stroke from a separate media store or from the atmosphere by suction through an inlet valve. Here two e.g. separate pumps or pressure chambers with the same axis can be operated simultaneously with a common handle. When the core body 21 returns in the opposite direction of flow, the volume of the chambers 34 and 35 is increased again, and the resulting negative pressure also abruptly cuts off the supply of the first medium to the end channel 14 or draws this medium back.

Any feature of any of the embodiments may be provided in any of the other embodiments. The properties mentioned, such as sizes, relative positions, effects or the like, can be provided exactly as described, differing slightly therefrom or essentially as described or more or less deviating therefrom, depending on which discharge characteristics are desired or which properties, in particular flow properties have the first and / or the second medium. Components or arrangements 1 to 53 can also only have one of the functions or effects mentioned.

Claims (10)

Discharge device for media, characterized in that it has at least one outlet channel (11, 12) which opens into a media outlet (13) and defines a media flow and which, in particular at a distance from the media outlet (13), has a pressure chamber (13) provided for generating a delivery pressure. 8, 9) section to be connected and determines passage cross sections. Discharge device according to claim 1, characterized in that at least one core body (20) associated with at least one outlet channel (11, 12) is provided or movable for influencing the media flow, in particular that a core body (20) for changing the media flow with increasing delivery pressure for constriction or the like. A passage cross section is movable in a first movement and that means for moving a core body (20) are preferably provided in a further movement that deviates from the first movement. Discharge device according to claim 1 or 2, characterized in that a core body (20) is controlled as a function of pressure, that in particular a core body (20) can be moved with increasing delivery pressure in a direction which deviates from the direction opposite to the direction of flow and that a core body ( 20) directly forms a boundary of an outlet channel (11, 12) adjacent to the media flow, and / or that a core body (20) immediately adjacent to the inner end (15) of an end channel forming an media outlet (13) with its outer end (16) (14) it is provided that in particular the end channel (14) passes through a one-piece end wall (37) and that the end channel (14) preferably has a smaller length or a smaller width than a core body (20, 21). Discharge device according to one of the preceding claims, characterized in that a core body (20) has an outer peripheral surface (32) and a free end surface (31) which are directly opposite an inner peripheral surface (33) and / or an inner end surface (30), that in particular passage cross sections of an axial passage gap (38, 44) between the outer and inner circumferential surface (32, 33) are essentially constant regardless of their relative movement and that preferably passage cross sections of a disk-shaped radial passage gap (35, 45, 46) between the end face (31 ) and the inner end face (30) can be changed essentially continuously depending on their relative positions. Discharge device according to one of the preceding claims, characterized in that on the outer circumference (32) and / or on the end face (31) of a core body (20) there is at least one channel recess (44, 45, 46) of a channel section of an outlet channel (11, 12) that in particular a groove-shaped channel recess (44, 45) is provided in the outer circumference (32) and / or in the end face (31) and that preferably a channel depression (46) in the center of the end face (31) forms a swirl or rotation swirl chamber lying approximately in the axis (10) of the media outlet (13). Discharge device according to one of the preceding claims, characterized in that a core body (20) is spring-loaded towards an initial position, in particular that a return spring (25) lies in front of an outlet closure (17) in the flow direction and that preferably a return spring (25) is in the pressure chamber (8) engages and / or is supported on a closure insert (3) forming a closure seat (26), which forms a closure body for the pressure chamber (8). Discharge device according to one of the preceding claims, characterized in that a core body (21) can be moved and / or driven by at least part of its path of movement essentially synchronously with at least one closing body (22) of a closure (17), in particular a core body (21) is rigidly or integrally connected to a closing body (22) and that preferably a core body (21) projects freely from an end face (29) of a closing or valve body (22) and / or with the same spring (25) as a closing body (22) is loaded. Discharge device according to one of the preceding claims, characterized in that at least two alternately widening in succession in the flow direction and constricting flow restrictors (17, 18, 19) are provided such that in particular a first flow restrictor (17) in the flow direction forms a throttle gap which extends over a circumference and can be changed for tight closure, and that a second flow restrictor (18, 19) preferably has an end throttle gap (34, 35) forms. Discharge device according to one of the preceding claims, characterized in that two separate outlet channels (11, 12) are provided for separate media flows, in particular that at least one outlet channel (12) opens towards a core body (20) and that preferably a first outlet channel (11) annularly around a core body (20) and a second outlet channel (12) in the flow direction at a distance thereafter opens out only over a small part of the circumference of a core body (20). Discharge device according to one of the preceding claims, characterized in that at least two nozzles (13, 53) located one behind the other are provided, in particular that one, such as the first in the flow direction, nozzle (53) into one opposite both nozzles (13, 53) expanded vortex chamber (35) and / or at a distance from the inlet end (15) of the second nozzle (13) and that preferably the first nozzle (53) is controlled on the inlet side with a core body (20).

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