EP3427839A1 - Liquid dispenser with ventilated bottle and applicator head for same - Google Patents

Abstract

A discharge head (20) for a liquid dispenser (100) for dispensing cosmetic or pharmaceutical liquids is known. Such a discharge head (20) has a coupling device (36) for attachment to an outlet nozzle (12) of a liquid reservoir (10) and a liquid inlet (34) directed in the direction of the liquid reservoir (10) and a discharge opening (44). It has a pumping device (50) for the conveyance of liquid from the liquid inlet (34) to the discharge opening (44) and via a ventilation channel (60) which connects an outer environment of the discharge head (20) with an interior of the liquid store (10).

It is proposed that the discharge head has an end face (32) by means of which a coupled liquid reservoir (10) at the distal end of the outlet nozzle (12) on the side of the discharge head (20) is largely closed and which breaks from the liquid inlet (34) is, wherein the end face (32) and the coupling device (36) are integrally formed as part of a common main component (30). This end face (32) has at least one ventilation opening (70), which is part of the ventilation channel (60) and can flow through the air in an inflow direction (2) in the liquid reservoir (10), wherein the at least one ventilation opening (70) has a minimum clear cross-section (80) of at most 3 × 10 ^-2 mm ² , preferably of at most 1 × 10 ^-2 mm ² , in particular preferably of not more than 5 × 10 ^-3 mm ² .

Description

AREA OF APPLICATION AND PRIOR ART

The invention relates to a discharge head for a liquid dispenser for dispensing cosmetic or pharmaceutical liquids according to the preamble of claim 1 and to a liquid dispenser according to the preamble of claim 14.

In such a dispenser it is provided that liquid is conveyed from the liquid reservoir by means of the pumping device to the discharge opening. So that the volume loss by the withdrawn liquid in the liquid storage does not lead to a negative pressure, which leads to disturbances in the discharge, the ventilation channel is provided, is sucked through the air from an environment by means of the negative pressure in the liquid reservoir to produce the pressure equalization.

Ventilation devices on generic dispensers with a connecting the environment with the liquid storage ventilation channel are known. So it is from the EP 1295644 A1 known to provide a small pressure equalization port, which is closed by a filter membrane. This solution is relatively complicated by the additional filter component with membrane and too expensive for simple applications. Furthermore, liquid can wet the membrane and make pressure equalization more difficult.

TASK AND SOLUTION

The object of the invention is to provide a generic discharge head available that can be produced inexpensively with few components.

According to the invention, a discharge head is proposed for this purpose, which has a coupling device, preferably in the form of an internal thread or a detent coupling device, for attachment to an outlet nozzle of a liquid reservoir and provides a liquid inlet directed in the direction of the liquid reservoir and a discharge opening. The dispensing head has a pumping device for the conveyance of liquid from the liquid inlet to the discharge opening, and via a ventilation channel, which connects an outer environment of the discharge head with an interior of the liquid storage.

The discharge head further has an end face, which together with the coupling device is part of a one-piece main component. This end face thus covers and closes the outlet on the side of the discharge head and is interrupted by the liquid inlet, wherein usually a riser pipe is attached as a separate component via a plug connection on the end face and projects into the liquid storage.

Furthermore, at least one ventilation opening is provided in the end face, but preferably a plurality of such ventilation openings. This ventilation opening is part of the ventilation channel and represents as it were the liquid storage end of the channel.

The at least one ventilation opening is characterized by a minimum clear cross-section at its narrowest point of at most 3 × 10 ^-2 mm ² , preferably of not more than 1 × 10 ^-2 mm ² , in particular of not more than 5 × 10 ^-3 mm ² .

In a discharge head according to the invention, the ventilation is thus carried out by very small openings which break through said end face directly and are particularly preferably aligned parallel to the main extension direction of the usually approximately cylindrical outlet nozzle of the liquid reservoir. Preferably, a plurality of such apertures are provided to ensure a sufficiently fast pressure equalization despite the small clear cross-section. However, embodiments with only one ventilation opening are also possible. Insofar as reference is made in the following to a plurality of vent openings, the statements equally apply to a design with only one ventilation opening, unless otherwise explicitly stated in the explanations.

The ventilation openings are freely accessible from the liquid reservoir and from the environment through the ventilation channel, that is not separated by a membrane or other permanent or switchable closure means. If a liquid dispenser spent with such a discharge head in an overhead position, so the liquid is accordingly directly on the pierced by the ventilation apertures face, so that no additional protection is provided between the liquid and the ventilation openings.

However, the particularly small design of the ventilation apertures causes the liquid usually does not penetrate into the ventilation openings or in the case of penetration does not completely pass through them. Instead, it forms under the impression of surface tension a curved liquid surface at the liquid storage side entrance of the ventilation opening, in the ventilation opening or at the entrance on the side facing away from the liquid storage.

The maximum diameter of 5 × 10 ^-3 mm ² is usually sufficient for aqueous cosmetic or pharmaceutical liquids in the liquid reservoir and at a liquid level of the liquid reservoir of up to about 10 cm. Other liquids, for example, higher viscosity cosmetic liquids, even with larger diameters can not pass or not to relevant extent.

Whether in the desired manner a liquid surface adjusts to the ventilation holes, which prevents leakage of the liquid in relevant amounts, also depends on the shape of the cross section of the ventilation openings. Basically, a round or rounded shape of the cross section is preferred. However, polygonal cross-sections can be advantageous in terms of production technology and sufficiently reliable in operation.

The ventilation openings form the last part of the ventilation duct. The supply of the air to the side opposite the liquid storage side is preferably carried out by an unsealed gap between the actuating handle and the base, but may for example also be done by a dedicated opening in the base or another part of the discharge head.

The inventive design of the ventilation openings is manufacturing technology very simple and is therefore particularly suitable for low-cost discharge heads, which in turn are used in more reasonably priced products such as soap dispensers. Preferably, such a discharge head is a discharge head with said main component, which is provided as a base on the liquid storage, and an operatively mounted thereon slidingly actuating lever. Preferably, these two components together define an interior in which a pumping chamber of the pumping device is arranged. It may also be expedient to design the pumping device such that it is formed by an elastically compressible and in particular bellows-shaped hollow body, which is designed to be open on an input side and on an output side. Such a hollow body fulfills a dual function, since it can make a separate return spring superfluous by its elasticity. Furthermore, it can be provided that an inlet valve on the inlet side of the pumping chamber and / or an outlet valve on the outlet side of the pumping chamber are formed integrally with this hollow body.

Thus, a discharge head according to the invention can be constructed in a special embodiment and not taking into account a possibly existing riser and a possibly existing cap of only three components, namely the pumping chamber component with molded valves, the main component with coupling device, liquid inlet and the ventilation openings according to the invention and the actuating handle.

The shaping of the ventilation apertures in the direction of extension can be purely cylindrical, preferably circular-cylindrical. However, this goes hand in hand with an increased and mostly unjustifiable additional effort compared to other alternatives.

Thus, the ventilation apertures can be formed as an opening tapering continuously in the inflow direction or counter to the inflow direction, by which it is understood that the cross section tapers continuously and / or in the region of steps in one direction, wherein cylindrical sections can also be provided. The simplest form of such a design is in a cone section or pyramid section shape of the aperture. The advantage of such a design lies in the simplicity of the injection mold required for the production, since only one mold section of the injection mold on one side of the produced end face for generating the ventilation openings must have a correspondingly fine structure, while the opposite mold section of the injection mold can be easily configured. In principle, however, designs are also conceivable in which corresponding structures are provided on both mold sections, which together keep the ventilation apertures clear and thus produce a ventilation opening tapering from both sides of the end face to the opposite side.

It is advantageous if a cylindrical channel section, whose length corresponds at least to the mean diameter at this, forms the location of the minimum clear cross-section. Also, the respective end of cone section-shaped or pyramid-section-shaped channel sections, which may be oriented in the inflow direction or counter to the inflow direction, may form the location of the minimum clear cross section.

How many ventilation holes are provided depends on the application. Since the ventilation openings develop a strong throttling effect, a single ventilation opening is usually sufficient only when the discharge of larger quantities of liquid in a short period of time is not required. For cosmetic liquids like soap, which in comparatively be discharged in large quantities, a plurality of ventilation openings is provided, for example, 2, 3, 4, 5, 6 or 8 ventilation openings. These openings can be arranged close to each other. However, it is advantageous to have a certain spacing, so that at least two ventilation apertures transverse to the alignment of the outlet nozzle are spaced apart by at least 5 mm. In the case of a preferred arrangement in which the ventilation openings are arranged surrounding or partially surrounding the liquid inlet, two ventilation openings are preferably at least 60 ° apart from the liquid inlet at an angle.

The distance of the ventilation apertures should in particular cause, that in the case of unwanted fluid passage through a ventilation opening not closely adjacent ventilation openings also fill with liquid from the side facing away from the liquid storage and thus allow even more increased unwanted fluid passage through the ventilation openings.

As already explained, the concept of the vent openings is based on the fact that the liquid in an occurring for example in transport situation in the overhead position of the liquid dispenser rests against the ventilation openings and can not pass here, or only to a small extent due to the surface tension. A special design of the face made of special material or with special coatings is not mandatory for this purpose.

However, the safety can be further increased if the main component is made of a plastic, which is formed by supplementing with an additive as a whole hydrophilic or hydrophobic component, and / or if the end face of the main component on one or both sides with a hydrophilic or hydrophobic coating is provided.

For the purposes of the surfaces proposed here, hydrophilic and hydrophobic structures are to be understood as reference liquids relative to water. Hydrophilic is a body or its surface, if a Kontaktwinkei Θ of a resting on a corresponding flat surface water droplet is less than 75 °. Hydrophobicity is given when the contact angle Θ is more than 115 °.

Both a hydrophilic and a hydrophobic design may be advantageous on the side of the end face pointing in the direction of the liquid reservoir. A hydrophobic design means that the liquid applied to the front side quickly rolls off after returning from the overhead position to the starting position.

The hydrophilic configuration of the end surface facing the liquid reservoir is expedient if, deviating from this, the inner surfaces of the ventilation apertures and / or the opposite side of the end surface are not hydrophilic or even hydrophobic. This can be achieved, for example, by means of a hydrophilic coating on the side facing the liquid storage. In such a design, liquid that has entered the ventilation holes is sucked back into the liquid reservoir.

Since liquid tends to form a stable surface at the transition between hydrophilic and hydrophobic surfaces or at the junction of hydrophilic or hydrophobic surfaces and surfaces without such a configuration, which prevents under the impression of the surface tension gravity flowing out of liquid, such a hydrophilicity jump is preferred provided at the entrance of the ventilation openings, at the exit or in its course.

In order to design a specific location in the ventilation openings in such a way that the formation of the surface of the liquid preferably takes place at that location, it can be provided that the ventilation opening surrounding wall has at least one surface formation edge in the course of the ventilation opening, at the portions of the wall at an angle of at least 135 ° meet and which is formed with a radius of curvature <0.1 mm sharp edge. Sharp-edgedness in the ventilation holes, which extends in the direction of their extension, has been found to interfere with the formation of a surface. A circumferential sharp edge, however, favors the surface formation in the region of this edge.

It may also be advantageous if a plurality of such surface formation edges are arranged behind one another on a ventilation opening, so that a plurality of surfaces favoring surface formation are thereby formed. As a result, for example, manufacturing damage to one of the surface formation edges can be compensated.

The ventilation openings are preferably designed such that they in an overhead position and full liquid storage passage of the liquid under the action of the liquid through the avoid hydrostatic pressure. In order to avoid a considerably higher pressure due to movement of the dispenser, such as shaking and shaking, the liquid-storage-side end of the ventilation opening is preferably arranged in such a way that a surface section, spaced apart from the end, of another component or of the main component itself forms the end of the ventilation opening, forming a narrow slot there bouncing liquid protects.

Particularly advantageous for this is an embodiment in which the discharge head has a sealing ring for the purpose of circumferential sealing of the discharge head relative to the outlet port of the liquid reservoir. This sealing ring preferably has a surface extension and in particular an inner diameter, by which it covers the at least one ventilation opening in relation to the main extension direction of the outlet nozzle of the liquid reservoir, and is spaced from an exit side of the ventilation opening to form said narrow slot, so that air at the sealing ring pass into the liquid storage.

In particular, the sealing ring preferably has an inner radius which is smaller than the spacing of at least one of the ventilation openings from a central axis defined by the liquid inlet. The sealing ring fulfills a dual function, namely the conventional sealing effect as well as impact protection.

In this case, several embodiments are conceivable in which each of the liquid storage side facing the end face has a flat contact surface, against which the sealing ring. Thus, the side of the end face facing the liquid accumulator can have a region recessed with respect to the abutment surface into which the at least one ventilation opening opens. Such a depression, in which one or more vent openings open, may be pocket-like, radially inwardly or circumferentially radially inwardly open. Since the sealing ring rests against the bearing surface offset relative to this depression, the inflowing air can flow radially inwards in the gap formed by the depression and then further into the liquid reservoir. These recesses on the side of the face are technically easy to produce during injection molding and allow the use of unaltered, both sides plump sealing rings. Alternatively or additionally, it may be provided that, on the side of the sealing ring facing the end face, it has a region recessed with respect to the contact surface, wherein the recessed region is arranged such that the at least one ventilation opening opens into this recessed region of the sealing ring. Even if the recesses are not provided on the end face, but on the sealing ring, the two above-mentioned shapes are possible, on the one hand the circumferential recess which extends in particular to the inner diameter of the sealing ring and forms a common slot for ventilation for all ventilation openings, on the other pocket-like local depressions into which possibly only one or only a few ventilation apertures of all ventilation apertures open.

The invention also relates to a liquid dispenser, which on the one hand has a liquid reservoir with an outlet nozzle, and on the other hand comprises a discharge head coupled to the outlet nozzle via a latching or threaded connection. In this case, this discharge head is designed according to the invention in the manner described above.

The liquid dispenser is preferably filled with a cosmetic liquid such as a soap or lotion, which can be discharged via the actuating handle of the discharge head.

The vent openings are adapted to the shape, the amount and the intended content of the liquid storage such that form in the manner outlined above in the overhead position on all ventilation openings surfaces that prevent gravity-induced leakage of the liquid storage through the ventilation openings therethrough. It is in an embodiment of the invention is not always important to completely prevent the unwanted leakage of liquid through the ventilation openings. Usually it is enough if such leakage is minimized.

BRIEF DESCRIPTION OF THE DRAWINGS

• Fig. 1 zeigt einen erfindungsgemäßen Spender in einer Gesamtdarstellung.
• Fig. 2 und 2A zeigen ein erstes Ausführungsbeispiel in einer Schnittdarstellung des Austragkopfes mit vergrößertem Teilausschnitt.
• Fig. 3 zeigt in einer Ansicht vom Flüssigkeitsspeicher aus die Anordnung von Belüftungsdurchbrechungen in der Stirnwand des Austragkopfes.
• Fig. 4 verdeutlicht die Wirkung der Belüftungsdurchbrechungen bei Ausrichtung des Spenders in einer Überkopflage.
• Fig. 5 und 5A zeigen ein zweites Ausführungsbeispiel in einer Schnittdarstellung des Austragkopfes mit vergrößertem Teilausschnitt.
• Fig. 6A bis 6H zeigen unterschiedliche Varianten die Formgebung der Belüftungsdurchbrechungen betreffend.
• Fig. 7 verdeutlicht die Anordnung und Wirkung einer partiell hydrophoben Ausgestaltung des Austragkopfes.

Further advantages and aspects of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are explained below with reference to the figures.

• Fig. 1 shows a dispenser according to the invention in an overall view.
• Fig. 2 and 2A show a first embodiment in a sectional view of the discharge head with enlarged partial section.
• Fig. 3 shows in a view from the liquid storage from the arrangement of ventilation openings in the end wall of the discharge head.
• Fig. 4 illustrates the effect of the ventilation openings when aligning the dispenser in an overhead position.
• Fig. 5 and 5A show a second embodiment in a sectional view of the discharge head with enlarged partial section.
• Fig. 6A to 6H show different variants concerning the shape of the ventilation openings.
• Fig. 7 illustrates the arrangement and effect of a partially hydrophobic configuration of the discharge head.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Fig. 1 shows a liquid dispenser 100 according to the invention, in this case a liquid dispenser for dispensing cosmetic lotions. The liquid dispenser 100 has a liquid reservoir 10 in a bottle-like shape, at the upper end of an outlet 12 with in Fig. 1 not shown external thread is arranged. The liquid reservoir 10 is screwed into a discharge head 20 which, in turn, has a main component 30 forming the base of the discharge head 20, on which an actuating push-button 40 is slidably mounted in an actuating direction.

The discharge head 20 has an in Fig. 1 Pumping device 50, not shown, with the liquid from the liquid storage 10 can be promoted to a discharge opening 44.

As a result, the amount of liquid remaining in the liquid storage 10 is reduced, air from a surrounding atmosphere for the purpose of pressure equalization must enter the liquid storage 10. The problem lies in the fact that a ventilation duct, which leads from an external environment into the liquid storage 10, at the same time, even in overhead position of the liquid dispenser 100, for example, when the dispenser is transported in a bag, can leak fluid through the ventilation channel.

The ventilation device described below serves the purpose of allowing the ventilation without the risk of leakage of a relevant amount of liquid in the overhead position is to be feared.

Fig. 2 shows a first embodiment of a dispenser according to the invention and its discharge head in a sectional view. It can be seen that the pumping device 50 is formed by a bellows-type hollow body 54, which is designed to be open on its input side and its output side, attached to the main component 30 and to the actuating pushbutton 40, wherein it is attached to the main component 30 on a pumping chamber socket 38 is clamped, which limits the sliding length of the hollow body 54 by means of a stop surface 38A.

On the actuating handle 40, the hollow body 54 is clamped in a sleeve portion 47. The wall of the hollow body 54, which surrounds the pumping chamber 52, is bellows-shaped, in order to produce a reproducible compression when depressing the actuating pushbutton 40 by manual application of force to the pressure surface 42. On the input side and output side of the pumping chamber 52, an inlet valve 56 and an outlet valve 58 are provided, both of which each have an elastic valve portion 56A, 58A, which is integrally formed on the hollow body 54, so that in addition to the main component 30 and the actuating lever 40 only another Component is needed to provide a reliable pumping device available.

The main component 30 is that component which provides the coupling device 36, in the present case in the form of an internal thread. It is at the same time that component which forms an end face 32, which in the present case has a largely planar design, but does not have to be designed in this way, and which closes the liquid reservoir 10 in the region of its outlet nozzle 12. For the purpose of sealing, a sealing ring 26 is provided, which has a functional significance in the context of the invention in the second embodiment described below. The end face 32 of the main component 30 is pierced for two purposes. On the one hand, the liquid inlet 34 is provided here, which opens into the pumping chamber nozzle 38 and on which a riser 28 is provided, which protrudes into the liquid reservoir 10.

Furthermore, the end face 32 is interrupted by a total of eight aeration baffles 70, which are part of a ventilation channel 60, by means of which air can flow into the liquid reservoir 10 after the discharge of liquid for the purpose of pressure equalization. The ventilation channel 60 or ventilation path is illustrated in its entirety by a dashed line. The ventilation path passes through a gap between the main component 30 and the actuating push-button 40 in an interior formed by these two components and from there to the vent openings 70th

The ventilation openings 70 are, as will be explained below, configured so slim that, although air can flow in, but no liquid flows out under normal conditions.

As based on the Fig. 3 is clarified, a total of eight ventilation openings 70 are provided because due to the very slender shape of the ventilation openings 70 alone would not be sufficient to compensate for the loss of fluid in the liquid storage 10 by a plurality of successive operations. The eight ventilation apertures 70 are arranged uniformly at a distance of 45 ° from each other, surrounding the pumping chamber nozzle 38 and its center axis, so that a large distance between the ventilation apertures 70 results. The distance between opposing ventilation openings 70 is about 25 mm, the distance between adjacent ventilation holes 70 is about 8 mm. This serves the purpose that in the case of an unwanted fluid passage through one of the ventilation openings 70, the liquid should not run on the side facing away from the liquid storage 10 side of the end face 32 in the region of another vent opening, so as not to interfere with their function.

Fig. 4 shows a section of the discharge head 20 of Fig. 1 in an overhead position of the dispenser 100. It can be seen that the liquid clarified by bubbles flows up to the ventilation opening 70, at the channel portion 74 with a minimum clear cross section and a sharp surface forming edge 78 of approximately 60 ° forms a dished surface 90 shown in dashed lines, due to the surface tension of the liquid prevents the entry of further liquid into the ventilation opening 70. Even if liquid enters the ventilation opening 70, a situation arises again on the opposite side of the ventilation opening 70, which results in a curved surface which is stable under the impression of the surface tension of the liquid and effectively prevents the passage of further liquid.

The Fig. 5A and Figure 5B shows a somewhat different embodiment. Here, the sealing ring 26 is provided with a smaller inner diameter, but in addition with a recess 27 on its upper side, so that here the upper side of the sealing ring 26 is slightly recessed relative to the contact surface of the sealing ring 26 on the end face 32. This forms together with the end face 32 a very narrow slot 68, but does not hinder the entry of air into the liquid storage 10.

This design ensures that the ventilation apertures 70 are not acted upon by jerky movements of the liquid dispenser 100 or even a shaking with bouncing directly on the ventilation opening 70 liquid, which would be able to pass through the ventilation opening 70.

The Fig. 6A to 6H show various possible embodiment of the ventilation openings 70th

In case of FIGS. 6A and 6B the ventilation openings 70 are each formed in the form of a cone section or a pyramid section, wherein in the case of the embodiment of FIG Fig. 6A taper towards the liquid reservoir 10 and in the case of the embodiment of Fig. 6B to rejuvenate in the opposite direction. Such ventilation apertures 70 are particularly easy to produce, since mold sections of an injection mold for forming such ventilation apertures 70 are required only on one of the two partial molds for the production of the main component 30. On the opposite side, the tool can be designed flat in the same area. It has been found that the liquid pressure required to pass through a ventilation aperture thus formed is scarcely less than that of a purely cylindrical aperture like that of Fig. 5D.

In the design according to Fig. 6C the ventilation openings 70 taper from both sides. This results in three Oberflächenbildungskanten 78 of about 135 °, about 90 ° and about 135 ° behind each other, each of which are suitable to prevent the escape of liquid.

In the design of Fig. 6E a circumferential trench-like depression 77 is provided on the end face 32, into which the ventilation apertures 70 open. The ventilation openings 70 can thereby be shorter, which facilitates manufacturability. In the case of the embodiment of FIG. 5F, such recesses 77 are provided on both sides of the end face 32.

The design of the Fig. 6G is different from the similar design of the Fig. 6A in that the sealing ring 26 has no recess. Instead, a recess 32 D is provided on the underside of the end face 32, which also makes it possible to take a sealing ring 26 with an inner diameter, which covers the ventilation apertures 70 and thus during shaking of the Dispenser 100 no direct impact of the liquid at the ventilation opening 70 allowed.

The design according to the Fig. 6H is one with a comparatively complex shape of the ventilation opening. The ventilation opening 70 shown here has a conical shape on both sides, wherein a short cylindrical section defines the most tapered point.

In the design according to Fig. 7 For example, the main component 30 and the end face 32 are made hydrophobic but provided with a hydrophilic coating 79 on their underside. On the one hand, this combination results in a particularly reliable manner in the overhead position for a further passage of liquid preventing liquid surface 94 at the boundary line between the hydrophilic and the hydrophobic region. In addition, liquid which has fallen into the ventilation apertures 70 in the event of a brief overflow position is sucked back into the liquid reservoir 10 by the hydrophilic coating 79 from the hydrophobic aeration aperture 70 after returning to the starting position.

Claims (15)

Dispensing head (20) for a liquid dispenser (100) for dispensing cosmetic or pharmaceutical liquids with the following features: a. the discharge head (20) has a coupling device (36) for attachment to an outlet nozzle (12) of a liquid reservoir (10), and b. the discharge head (20) has a liquid inlet (34) directed in the direction of the liquid reservoir (10) and via a discharge opening (44), and c. the discharge head (20) has a pumping device (50) for conveying liquid from the liquid inlet (34) to the discharge opening (44), and d. the discharge head (20) has a ventilation channel (60) which connects an external environment of the discharge head (20) to an interior of the liquid storage device (10), characterized by the following additional features: e. the discharge head (20) has an end face (32) by means of which a coupled liquid reservoir (10) at the distal end of the outlet nozzle (12) on the side of the discharge head (20) is largely closed and which is broken by the liquid inlet (34), and f. the end surface (32) and the coupling device (36) are integrally formed as part of a common main component (30), and G. the end face (32) has at least one ventilation opening (70), which is part of the ventilation channel (60) and can flow through the air in an inflow direction (2) into the liquid store (10), and H. the at least one ventilation opening (70) has a minimum clear cross-section (80) of at most 3 × 10 ^-2 mm ² , preferably of not more than 1 × 10 ^-2 mm ² , in particular of not more than 5 × 10 ^-3 mm ² Discharge head (20) according to claim 1, having the following additional feature: a. the venting opening (70) is designed as an opening tapering continuously in the inflow direction (2). Discharge head (20) according to claim 1, having the following additional feature: a. the ventilation opening (70) is formed as a counter to the inflow (2) tapered opening. A dispensing head (20) according to any one of claims 1 to 3, having the following additional feature: a. the venting aperture (70) is formed at the location of the minimum clear cross section (80) by a cylindrical channel portion (72) whose length is at least equal to the mean diameter at that location. Discharge head (20) according to any one of the preceding claims, having the following additional feature: a. the ventilation opening (70) has a conical-section-shaped or pyramid-section-shaped channel section (74, 75) whose narrowest point forms the minimum clear cross-section (80) of the ventilating opening, in particular with at least one of the following additional features: b. the cone-section-shaped or pyramid-section-shaped channel section (74) tapers in the inflow direction of the air and / or c. the cone-section-shaped or pyramid-section-shaped channel section (75) tapers counter to the inflow direction of the air and / or d. the smallest clear cross-section (80) is in the plane of the surface (32A) of the end face (32) on the liquid storage (10) facing or in the plane of the surface (32B) of the end face (32) on the liquid storage (10) arranged away from the end. Discharge head (20) according to any one of the preceding claims, having the following additional feature: a. a plurality of ventilation openings (70) are provided, preferably 2, 3, 4, 5, or 8 ventilation openings, preferably with the additional feature: b. two circumferentially farthest spaced ventilation apertures (70) are at least 60 ° apart and / or at least 5 mm apart. Discharge head (20) according to one of the preceding claims, having one of the following additional features: a. the main component (30) is made of a plastic, which is formed by supplementing with an additive as a whole hydrophilic or hydrophobic component, and / or b. at the end face (32), the main component (30) is provided on one or both sides with a hydrophilic or hydrophobic coating. Discharge head (20) according to any one of the preceding claims, having the following additional features: a. the discharge head (20) has a sealing ring (26) for the purpose of circumferentially sealing the discharge head (20) with respect to the outlet port (12) of the liquid reservoir (10), and b. the sealing ring (26) has a surface extension, by means of which it covers the at least one ventilation aperture (70) relative to the main extension direction (4) of the outlet nozzle (12) of the liquid reservoir (10), and c. the sealing ring (26) is spaced from an exit side of the ventilation opening (70) to form a narrow slot (68) so that air can pass the sealing ring (26) into the liquid reservoir (10). Discharge head (20) according to claim 8, having the following additional features: a. the liquid storage (10) facing side of the end face (32) has a flat contact surface (32C) on which the sealing ring (26) is applied, and b. the side of the end face (32) facing the liquid reservoir has a region (32D) that is recessed in relation to the contact surface (32C) and into which the at least one ventilation opening (70) opens. Discharge head (20) according to claim 8 or 9, having the following additional features: a. the sealing ring (26) has a flat contact surface (26A), by means of which it rests against the end face (32), and b. the sealing ring (26) has on the end face (32) facing side of the sealing ring (26) opposite the contact surface (26A) recessed portion (26B), which is preferably formed as the liquid inlet (34) surrounding recess, wherein the recessed Region (26 B) is arranged such that the at least one ventilation opening (70) in this recessed portion (26 B) of the sealing ring (26) opens. Discharge head (20) according to one of the preceding claims, having at least one of the following additional components: a. the discharge head (20) has an actuating push-button (40), which is slidably mounted on the main component (30), and / or b. the discharge head (20) has an actuating push-button (40) which, together with the main component (30), defines an interior space in which a pumping chamber (52) of the pumping device (50) is arranged. Discharge head (20) according to any one of the preceding claims, having the following additional feature: a. the pumping device (50) has a pumping chamber (52) which is formed by an elastically compressible hollow body (54) which is open on an input side (54A) and on an output side (54B), preferably with at least one of the additional features: b. the pumping chamber (52) has on the inlet side (54A) an inlet valve (56), which is at least partially formed by an inlet valve section (56A) formed integrally with the hollow body (54), and / or c. the pumping chamber (52) has on the outlet side (54B) an outlet valve (58), which is at least partially formed by an outlet valve section (58A) formed integrally with the hollow body (54). Discharge head (20) according to one of the preceding claims, having at least one of the following features: a. the main component (30) has a pump chamber nozzle (38) projecting beyond the end face (32) opposite the liquid reservoir for spaced attachment of the hollow body (54) forming the pumping chamber (52), more preferably a stop surface (38A) provided on the pump chamber nozzle (38) is, on which the input side (54 A) of the hollow body (54) abuts and / or b. the coupling device (36) is designed in the manner of an internal thread, and / or c. the coupling device is designed as a latching device, wherein for this purpose at least one elastically deflectable latching edge is provided for latching on the neck of the liquid reservoir on the main component, and / or d. the wall surrounding the ventilation opening (70) has at least one surface formation edge (78) in the course of the ventilation opening, at which sections of the wall meet at an angle of at least 135 ° and which is sharp-edged with a radius of curvature <0.1 mm, and /or e. a central axis of the at least one ventilation opening (70) extends parallel to the main extension direction (4) of the outlet nozzle (12) of the liquid reservoir (10). Liquid dispenser (100) for dispensing cosmetic products having the following features: a. the liquid dispenser (100) has a liquid reservoir (10) with an outlet nozzle (12), and b. the liquid dispenser (100) has a discharge head (20) which is fastened to the outlet connection (12) by means of a coupling device (36), characterized by the additional feature: c. the discharge head (20) is designed according to one of the preceding claims. A liquid dispenser (100) according to claim 14, having the following additional features: a. the liquid reservoir (10) is filled with a cosmetic liquid, and b. the smallest clear diameter of the at least one ventilation opening (70) is designed such that the hydrostatic pressure, which is maximally generated by the liquid in the liquid storage (10), can not pass through the ventilation opening (70) due to the surface tension of the liquid.

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