DISPENSER AND LIQUID DISPENSER WITH ONE DISPENSER HEAD

Description

FIELD OF APPLICATION AND STATE OF THE ART

[0001] The invention relates to a discharge head for a liquid dispenser for discharging pharmaceutical or cosmetic liquids and to a liquid dispenser provided with such a discharge head.

[0002] Dispensing heads of this type comprise a deformable pumping chamber component arranged between a base and an actuating pushbutton, so that its internal volume, in conjunction with an inlet valve and an outlet valve, forms a pumping chamber whose contents can be discharged by pressing the actuating pushbutton. Dispensing heads of this type, with a particularly simple design, can consist of only three components, since the inlet and outlet valves, as well as any venting valve present, can be formed by valve lips or valve bodies integrally provided on the pumping chamber component together with a counter wall of the base or actuating pushbutton.

[0003] EP 3427840 A1 discloses a dispenser of this type, which has an inlet valve, an outlet valve, and a vent valve. However, the design presented therein still requires improvement with regard to the venting of the pump chamber and, in particular, the venting of a liquid reservoir connected to the dispensing head. It was found that the vent valve is difficult to adjust so that it reliably opens at all times under negative pressure, but otherwise closes securely. If the vent valve does not close when the pressure is balanced, there is a risk that the dispenser will leak through the vent valve.

[0004] US Pat. No. 5,518,147 A discloses a pump dispenser and a dispensing head. The dispensing head has a bellows component for pumping purposes, which is attached with its lower end to a cylindrical portion of the base of the dispensing head. The bellows component has an integrally molded valve lip, which is part of a venting valve. The document discloses in the drawings that, in the area where the bellows component is pushed onto the cylindrical portion, a circumferentially non-uniform structure is provided below the end edge of the bellows component. TASK AND SOLUTION

[0005] The object of the invention is to further develop a discharge head of the generic type in such a way that it exhibits advantageous behavior when venting the pump chamber during commissioning and when ventilating the liquid reservoir during use.

[0006] According to the invention, a dispensing head is proposed which has a base and an actuating pushbutton which can be depressed relative to the base between an unactuated end position and an actuated end position in an actuating direction. Furthermore, the proposed dispensing head has a liquid inlet for connection to a liquid reservoir and a discharge opening for dispensing liquid into an environment. A pumping device is provided for conveying liquid from the liquid reservoir to the discharge opening. This pumping device has a deformable pumping chamber component which is open on both sides and is fastened to the base and the actuating pushbutton and surrounds a variable-volume pumping chamber which has an inlet valve facing the liquid reservoir and an outlet valve facing the discharge opening.

[0007] The discharge head also has at least one vent opening that penetrates the base and is associated with a vent valve. The vent opening and the vent valve allow air to flow into the liquid reservoir to allow pressure equalization after liquid has been removed. The vent valve has a circumferential annular web on the base that extends above a surrounding, radially extending cover wall of the base. The inner surface of the vent valve forms a circumferential valve surface for the engagement of a valve lip.

[0008] The said circumferential valve surface is provided on the base, which is inherently or by coupling to a liquid reservoir placed in a state of stress that can act on the valve surface and allows the reproducibility of the shape of the valve surface.

[0009] To ensure that the vent valve opens in the desired manner when there is negative pressure in the liquid reservoir and is closed otherwise, two optional measures are proposed, which are preferably fulfilled in combination.

[0010] Firstly, it is proposed to provide a reinforcing structure on the upper side of the cover wall surrounding the ring web, preferably in the form of a circumferential reinforcing web. In the area of ​​this reinforcing web, the cover wall is preferably at least 50% thicker than in the inner and outer areas of the cover wall.

[0011] The reinforcement structure is preferably arranged opposite a region of the underside of the cover wall, against which a storage nozzle or bottle neck of the liquid reservoir rests after the liquid reservoir is coupled. The reinforcement structure is preferably arranged at least partially opposite a clear cross-section of the storage nozzle or bottle neck. The reinforcement structure can thus at least partially absorb any stress coupled into the base from the storage nozzle or bottle neck, thus preventing it from reaching the annular web and the valve lip there, or only to a limited extent.

[0012] The second measure, which is preferably provided together with the said reinforcement structure, consists in that the circumferential annular web is part of a sleeve-shaped structure which forms the circumferential annular web above the cover wall and which extends flush beyond the adjacent cover wall below its planes and there forms a circumferential wall section flush with the annular web.

[0013] The cover wall thus transitions on the inside into a sleeve shape, which forms the annular web with the valve surface above the level of the cover wall and the circumferential wall section below the cover wall. This preferably transitions into a circumferential annular wall, which is perforated by at least one vent opening. The circumferential wall section can also facilitate coupling to the liquid reservoir and serve as a guide. With a discharge head attached to the liquid reservoir, the wall section preferably extends into the bottle neck or storage nozzle of the liquid reservoir.

[0014] It has been found that the aforementioned sleeve-shaped structure significantly stabilizes the position of the valve surface. In particular, when combined with the aforementioned reinforcement structure, it ensures that even very strong stresses in the outer area of ​​the base, for example, caused by over-tightening the discharge head, do not negatively affect the opening properties of the venting valve.

[0015] The discharge head has at least one vent opening that penetrates the base and is associated with a vent valve. This vent valve has a circumferential annular web on the base, the inside of which forms a valve surface. It also has a valve lip that is formed integrally with the pump chamber component and rests circumferentially against the valve surface when the vent valve is closed.

[0016] To secure the pump chamber component to the base, the base has an inlet nozzle forming the fluid inlet, onto which a fastening section of the pump chamber component is pushed. According to the invention, this inlet nozzle, in turn, has a support structure with a plurality of outwardly facing and non-circumferential support surfaces that come into contact with the pump chamber component toward the end of the actuation push-button depression, thereby causing the contact force with which the valve lip rests against the valve surface to be circumferentially non-uniform.

[0017] The inlet nozzle supports the pump chamber component and thus also the valve lip of the venting valve provided on it. The support structure on the outside of the inlet nozzle ensures that a negative pressure in the fluid reservoir does not result in a uniform force being applied to the valve lip all around. It has been shown that such a uniform force application makes opening more difficult and more difficult to predict, particularly when the valve lip has a widening shape, whereby a straight line between a contact surface at the distal end of the valve lip and the valve lip root on the pump chamber component encloses an angle of between 30° and 60° with the actuation direction and thus has a high degree of inherent rigidity. On the other hand, the uniform force application all around can cause fluttering on the sealing lip and thus undesirable noise development.

[0018] The non-uniformity caused by the support structure prevents this, as it creates a region of the valve lip with an increased opening inclination. This allows for reproducible, noise-free opening.

[0019] The support structure preferably has a plurality of support surfaces, preferably between 2 and 12, in particular between 4 and 8, which are uniformly distributed over the circumference. The areas of increased opening inclination are located between these support surfaces.

[0020] The support structure has a plurality of ribs, the end faces of which point toward the actuating pushbutton forming the support surfaces. These ribs can simultaneously provide partial stiffening of the base, which counteracts the aforementioned deformation of the valve surface of the ventilation valve. The at least one ventilation opening can preferably be arranged circumferentially between these ribs.

[0021] The outlet valve of a discharge head according to the invention can be provided with a circumferential annular web projecting downwards from an inner end wall of the actuating pushbutton toward the base, the outer side of which forms a circumferential valve surface. On the inside of this, the discharge head has an additional displacement structure projecting downwards from the inner end face of the actuating pushbutton. This displacement structure has a receiving space open toward the pump chamber and laterally closed by a surrounding wall. The displacement structure is separated from the annular web, preferably by a circumferential recess.

[0022] The displacement structure reduces the pump chamber volume. Particularly when a bellows is used as the primary design of the pump chamber component, this reduction does not affect the usable pump chamber volume, i.e., the amount of fluid discharged with one actuation stroke, but only the unusable residual volume of the pump chamber. In addition to the direct reduction in the pump chamber volume, the displacement structure creates a space for the absorption of residual air. The air that is difficult to expel collects in this space in the pump chamber, ensuring that it does not reach the outlet valve, or only to a limited extent, and thus disrupts its function.

[0023] The surrounding wall of the displacement structure preferably extends beyond the annular web into the pumping chamber. While the annular web itself can only have a limited extension toward the base due to the shape of the pumping chamber component, particularly in its bellows configuration, the displacement structure can extend further into the pumping chamber in the actuation direction.

[0024] The pump chamber has a maximum volume VPMax, which is defined by the interior of the pump chamber between the inlet valve and the outlet valve when the actuating button is in the unactuated end position. The receiving chamber has a receiving chamber volume VA, which is formed by that portion of the pump chamber volume enclosed within the surrounding wall. The ratio between the receiving chamber volume VA and the pump chamber volume VPMax is preferably between 1:50 and 1:10.

[0025] In a discharge head according to the invention, it can be provided that the discharge head has at least one ventilation opening which penetrates the base and to which a ventilation valve is assigned, which has a circumferential valve lip which is integrally formed on the deformable pump chamber component and which rests against a circumferential valve web of the base in an outwardly prestressed manner.

[0026] To protect the valve lip before installation in the discharge head, a protective lip is provided. This protective lip is also integrally formed on the deformable pump chamber component and is located outside the valve lip to protect the valve lip. The protective lip preferably projects beyond the valve lip both radially and axially.

[0027] The purpose of the protective lip is, in particular, to protect the valve lip of the venting valve during handling prior to assembly. The valve lip is particularly vulnerable when designed as a conical valve lip with a widening shape toward the contact surface. It has been shown that sometimes barely visible damage caused by immediate injury and relaxation in the deformed state can significantly and unexpectedly affect the reproducibility of the valve lip's behavior during use of the discharge head.

[0028] The protective lip extends radially and axially beyond the valve lip, preventing the protective lip from coming into contact with the substrate, whether in the horizontal or upright position. Preferably, the valve lip is recessed relative to the protective lip in such a way that a pump chamber component of the same design cannot, or only very rarely, come into contact with the valve lip.

[0029] The discharge head can have at least one ventilation opening that penetrates the base and to which a ventilation valve is assigned. This has a circumferential valve lip that is molded as one piece onto the deformable pump chamber component and that rests against a circumferential valve web of the base with outward tension. A tilting leg that projects radially beyond the circumferential valve lip and is molded as one piece onto the pump chamber component is provided. Correspondingly, a button pointing in the direction of the tilting leg is provided on the actuating pushbutton. In the actuated end position, this button applies force to the tilting leg and thereby lifts the valve lip of the ventilation valve from the valve web or facilitates pressure-induced lifting of the valve lip from the valve web.

[0030] With such a design, venting can be forced when the actuating button is pressed down, or at least facilitated to such an extent that even a slight negative pressure in the bottle is sufficient to open the venting valve. The aforementioned tilting leg, which is preferably designed as a circumferential tilting collar, is integrally connected to the pump chamber component. It is arranged on the pump chamber component in such a way that the sealing lip, which is also integrally connected to the pump chamber component, is subjected to force when the tilting leg is pressed down by the actuating button.

[0031] The aforementioned forced opening or simplified opening allows the vent valve to be designed so that it only opens in this way or only when there is a significant negative pressure in the bottle. This allows for the creation of a particularly leak-proof vent valve. Since the forced opening occurs when the actuating button is pressed, i.e., before the return stroke and the resulting suction of liquid into the pump chamber, a slight negative pressure may develop in the liquid reservoir after the return stroke. However, this negative pressure will be equalized, at least briefly, upon the next actuation.

[0032] The invention also encompasses a liquid dispenser for dispensing pharmaceutical or cosmetic liquids, which has a liquid reservoir and a discharge head for conveying liquid from the reservoir into an environment. The discharge head is designed according to one of the preceding claims.

[0033] The liquid reservoir is preferably a ventilated liquid reservoir formed by rigid walls, which is ventilated through the aforementioned ventilation opening in the discharge head, so that the inflowing air comes into direct contact with the liquid. Such a design typically has a riser pipe on the discharge head, which projects from its base into the liquid reservoir. However, a design is also conceivable in which a bag is provided within the rigid wall of the liquid reservoir, in which the liquid is stored. Ventilation does not occur into this bag, but rather into a surrounding space within the rigid wall of the liquid reservoir. Depending on the design, a riser pipe can be dispensed with in such a bag system.

[0034] When delivered, the liquid dispenser's reservoir is filled with a pharmaceutical or cosmetic liquid. This can be a highly viscous liquid, such as a gel or foam. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Further advantages and aspects of the invention emerge 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 liquid dispenser according to the invention in an overall view. Fig. 2 shows the discharge head of the liquid dispenser according to the invention Fig. 1 in cut representation. Fig 3 shows the essential components of the discharge head in an exploded view. Fig. 4 illustrates the special structure of the base to ensure a reproducible opening behavior of a ventilation valve of the discharge head. Fig. 5 bis 6B illustrate the deformation of a valve lip of the ventilation valve during ventilation. Fig. 7 shows the internal structure of the actuating button of the discharge head. Fig. 8 und 9 show the structure of a pump chamber component designed as a bellows. Fig. 10A und 10B show a second variant of a discharge head, in the unactuated and actuated state. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Fig. 1 shows a liquid dispenser 100 for dispensing pharmaceutical or cosmetic liquids, for example, for dispensing a shower gel. The liquid dispenser 100 has a liquid reservoir 110 and a dispensing head 10, which is attached to a bottle neck or reservoir nozzle of the liquid reservoir 110 by means of a thread or other connection technology.

[0037] The dispensing head 10 has a base 20 and an actuating pushbutton 50 that can be depressed relative to the base 20 in the direction of actuation 2. A discharge opening 52 is provided on the actuating pushbutton. Pressing down the actuating pushbutton 50 actuates a pumping device 12 provided in the dispensing head 10, which pumps liquid from the liquid reservoir 110 to the discharge opening 52.

[0038] In Fig. 2 The discharge head 10 is shown in more detail. With reference to this Fig. 2 and the exploded view of the Fig. 3 the elements are explained in detail.

[0039] The main elements of the discharge head 10 are the aforementioned base 20, the actuating button 50 and a pumping chamber component 80, which is provided for attachment to both the base 20 and the actuating button 50 and which provides a pumping chamber wall in the form of a bellows 81. As can be seen from the Fig. 2 As can be seen, the pump chamber component 80, made of an elastically deformable plastic, is clamped onto a clamping surface 40 of an inlet nozzle 32 of the base 20 by means of a sleeve-shaped fastening section 82, said inlet nozzle 32 being penetrated by a liquid inlet 22. On the opposite side, the pump chamber component 80 is fastened to the actuating pushbutton 50 by means of a fastening flange 84, said fastening being effected on the inside of a circumferential fastening web 68 of the actuating pushbutton 50.

[0040] Together with the base 20 and the actuating pushbutton 50, the pumping chamber component 80 forms a total of three valves. An inlet valve 14 is provided at the upper end of the inlet nozzle 32. Here, the pumping chamber component 80 has an elastically deflectable hemispherical valve body 88, which is pressed against the liquid inlet 22 and opens when there is negative pressure in the pumping chamber 13. At the opposite end, the pumping chamber component 80 has a valve lip 86, which rests on the outside against an annular web 72 of the actuating pushbutton 50. When there is excess pressure in the pumping chamber 13, the valve lip 86 is deflected, particularly in the area of ​​the discharge opening 52, so that liquid can flow to the discharge opening 52 and into the surrounding atmosphere.

[0041] The third valve, which is formed by the pumping chamber component 80, is a vent valve 18. This is formed, on the one hand, by a circumferential valve web 42 of the base 20 and its inward-facing valve surface 44, and, on the other hand, by a conically widening valve lip 90 of the pumping chamber component 80. This valve lip has a contact surface 94 at its free end for engagement with the valve surface 44.

[0042] The vent valve 18 separates the ambient atmosphere from an annular space surrounding the inlet nozzle 32, which is connected to an interior of the liquid reservoir 110 via vent openings 28. When the pressure in the liquid reservoir 110, and thus also in the annular space, is lower than ambient pressure, the vent valve 18 opens, with the valve lip 90 at least partially losing contact with the valve surface 44.

[0043] The discharge of liquid takes place by pressing down the actuating push button 50 by applying force to an actuating surface 54, so that the bellows 81 of the pump chamber component 80 is compressed and the liquid contained therein flows out through the discharge opening 52 after the outlet valve 16 has been opened. If the actuating push button 50 is subsequently released, it returns to its initial position of the Fig. 2 back, whereby the outlet valve 16 is closed and instead the inlet valve 14 opens so that liquid can flow from the liquid reservoir 110 into the pump chamber 13.

[0044] To prevent a negative pressure from developing in the fluid reservoir 110 after fluid is withdrawn, which would prevent further fluid flow into the pump chamber 13, the vent valve 18 is provided. This valve opens when there is a negative pressure in the fluid reservoir 110, as the contact surface 94 on the side of the valve lip 90 opposite the valve lip root 92 lifts away from the valve surface 44, thus allowing ambient air to flow in.

[0045] Special aspects of the discharge head 10 are explained below with reference to the Fig. 4 bis 10B explained.

[0046] Fig. 4 shows a sectional view of the base 20 in a separate illustration. An internal thread 34 is provided on the base 20, by means of which the base is attached to a thread of the liquid reservoir 110. If the dispensing head 10 is screwed firmly onto the liquid reservoir 110, there is a risk that a cover wall 24 of the base 20 spanning the bottle neck of the liquid reservoir 110 will be placed under tension in a way that impairs the opening properties of the venting valve 18, in particular reducing the contact pressure of the contact surface 94 of the valve lip 90 on the valve surface 44 to such an extent that the venting valve 18 remains permanently open and liquid loss is to be feared here, or increasing the contact pressure to such an extent that the venting valve 18 does not open reliably, so that a negative pressure can build up in the liquid reservoir 110.

[0047] The base of the discharge head has two measures to prevent such a stress state. Firstly, a reinforcing structure 26 in the form of a circumferential web is provided on the upper side of the cover wall 24. This is located radially above the surface against which an uppermost edge of the bottle neck is pressed when the base 20 is screwed tightly onto the bottle neck. It has been shown that such a reinforcement effects decoupling, so that the induced stress state can only reach the valve web 42 to a small extent and can therefore only deform it to a small extent. The second measure is that the circumferential valve web 42 continues below the level of the cover wall 24 and forms a circumferential wall section 46 that is aligned therewith. The valve web 42 and the wall section 46 together form a sleeve shape. This also counteracts the deformation of the valve web 42.Even if the base 20 is improperly screwed onto the bottle neck of the liquid reservoir 110, the behavior of the vent valve 18 hardly changes.

[0048] The Fig. 5 und 6A and 6B illustrate a further aspect with regard to the venting valve 18. In order to allow reliable closing of the venting valve, it is advantageous if the valve lip 90 of the venting valve 18 has a conical shape with a widening in the direction of the contact surface 94 of the valve lip 90. However, this conical shape has the disadvantage that the valve lip 90 must undergo a deformation for the purpose of opening the venting valve 18, during which the contact surface 94 of the valve lip 90 is shortened so that it detaches at least partially from the valve surface 44 of the valve web 42.

[0049] To promote this deformation, the Fig. 5 As shown, a support structure 36 with ribs 39 is provided on the outside of the inlet nozzle 32, each of which forms support surfaces 38 on its upper side.

[0050] These support surfaces 38 promote the valve opening, since in the area of ​​the support surfaces 38 a deformation of the valve lip 90 is made more difficult, so that at the same time in the circumferential areas between two ribs 39 with support surfaces 38 the deformation of the valve lip 90 is promoted and here is at least easier compared to the areas supported by the support surfaces 38.

[0051] The Fig. 6A und 6B show this, whereby the figures each show the base 20 and only the valve lip 90 of the pump chamber component 80.

[0052] Fig. 6A This shows the state of the closed vent valve 18. The valve lip 90 is also shown separately here for clarity. When the vent valve is closed, the contact surface 94 rests against the outer valve surface 44 and has a rotationally symmetrical shape.

[0053] If a negative pressure is created in the liquid reservoir 110, this causes Fig. 6B This clearly shows a deformation of the valve lip 90 in the intermediate regions and thus a detachment of the contact surface 94 of the valve lip 90 in these regions. Air from the environment can thus flow into the liquid reservoir 110.

[0054] Fig. 7 shows the actuating push button 50 in a separate illustration and with a perspective from below into the actuating push button 50. The external fastening web 68 can be seen, on the inside of which the fastening flange 84 of the pump chamber component 80 is fixed.

[0055] Within this, an annular web 72 is provided, the outer surface of which forms the valve surface 74 against which the valve lip 86 of the outlet valve 16 rests in the idle state. Also within this, a displacer structure 60 is provided on the end wall 56 of the actuating pushbutton 50. This displacer structure 60 serves, on the one hand, to reduce the pump chamber volume. On the other hand, with its receiving space 64, which is surrounded by a circumferential wall 62, it forms a receiving area for residual air from the pump chamber 13. It has been shown that in practice it is difficult to completely displace the air from the pump chamber 13. Since the pump chamber volume remains comparatively large even when the actuating pushbutton 50 is pressed down, an amount of air initially present in the pump chamber 13 remains at least partially in the pump chamber when the dispenser is started up and during use.However, the displacement structure 60 ensures that a significant portion of this air volume enters the receiving chamber 64 and remains there permanently. This prevents this air volume from negatively affecting the reproducible opening and closing of the outlet valve 16. The aforementioned wall 62 of the displacement structure 60 extends into the bellows area 81 of the pump chamber component 80 and projects beyond the annular web 72.

[0056] The Fig. 8 und 9 show the pump chamber component in an isolated representation, where in Fig. 9 the pump chamber component is shown in section, while in Fig. 8 is shown as a whole.

[0057] It can be seen that the valve lip 90 assigned to the inlet valve 14 is specially protected against damage prior to assembly. This is advantageous because the pump chamber component 80 is preferably handled as bulk material during assembly, meaning that a large number of such pump chamber components 80 are handled, for example, transported and supplied, without any defined alignment. In particular, joint storage and transport in a large bag with a large number of pump chamber components 80 are common. There is a considerable risk that damage to the contact surface 94 at the distal end of the valve lip 90 could result in the venting valve remaining permanently open during operation.

[0058] To prevent this, a protective lip 96 is provided, which is also an integral part of the pump chamber component 80 and which extends both radially and axially over the contact surface 94 of the valve lip 90. The contact surface 94 is thus set back from the lower end face of the protective lip 96.

[0059] The Fig. 10A und 10B show a second embodiment of a discharge head 10 according to the invention. This is designed essentially identically to the embodiment of the previous figures, except for the following details. The only difference is that the fastening web 68, to the inside of which the upper end of the pump chamber component 80 is fastened, is already in the rest state of the Fig. 10A extends substantially further towards the lower end of the pumping chamber component 80.

[0060] This design is selected so that an end face closing the fastening web 68 at the lower end can act as a switch 70 which, when the actuating push button 50 is pressed down, forcibly opens the ventilation valve 18 or at least reduces the contact force of the contact surface 94 of the valve lip 90 and the valve surface 44 in such a way that the opening of the ventilation valve 18 for the purpose of establishing pressure equalization can be ensured.

[0061] Fig. 10B shows this effect. The figure shows the lower end position of the actuating push-button 50. In this lower end position, the button 70 presses on the outside of a tilting collar 98, which simultaneously supports the previously described protective lip 96. The arrows 4 illustrate this. The resulting deformation of the tilting collar 98 leads to the valve lip 90 attached to the inner end of this tilting collar 98 detaching from the valve surface 44. The arrows 6 illustrate this. This opening works particularly well when consistent with the previous embodiment and in particular the Fig. 5 the said ribs 39 with their respective support surfaces 38 are provided.

[0062] Thus, when the actuating pushbutton is pressed to its lower end position, the venting valve 18 is opened. If a vacuum remains in the fluid reservoir 110 from a previous actuation, it is equalized at this moment. While a renewed vacuum may arise in the fluid reservoir during the return stroke of the actuating pushbutton 50, this is not sufficient to prevent fluid from being sucked into the pump chamber 13 during the return stroke. The vacuum in the fluid reservoir is again equalized during the subsequent actuation.

Claims

1. Discharge head (10) for a liquid dispenser (100) for discharging pharmaceutical or cosmetic liquids, having the following features: a. the discharge head (10) has a base (20) and an actuating push-button (50) which can be depressed relative to the base (20) between a non-actuated end position and an actuated end position in an actuating direction (2), and b. the discharge head (10) has a liquid inlet (22) for connection to a liquid reservoir and an outlet opening (52) for dispensing liquid to an environment, and c. the discharge head (10) has a pumping device (12) comprising a deformable pump chamber component (80) which is open on both sides, is fastened to the base (20) and to the actuating push-button (50) and surrounds a variablevolume pump chamber (13), and which pumping device has an inlet valve (14) and an outlet valve (16), d. the discharge head (10) has at least one ventilation opening (28) which penetrates the base (20) and which is assigned a ventilation valve (18), and e. the ventilation valve (18) has, at the base (20), a circumferential valve bridge (42), the inner side of which forms a valve surface (44), and f. the ventilation valve (18) has a valve lip (90) which is formed in one piece with the pump chamber component (80) and which, when the ventilation valve (18) is closed, bears circumferentially against the valve surface (44), and g. for fastening the pump chamber component (80) to the base (20), the base (20) has an inlet stub (32) which forms the liquid inlet and onto which a fastening portion (82) of the pump chamber component (80) is pushed, characterized by the following further feature: h. the inlet stub (32) has a support structure (36) with a plurality of ribs (39), the end faces of which point in the direction of the actuating push-button (50) and form a non-circumferential support surface (38) which points outwards and comes into contact with the pump chamber component (80) towards the end of the depressing of the actuating push-button (50), and brings it about that a pressing force, with which the valve lip (90) bears against the valve surface (44), is not circumferentially uniform.

2. Discharge head (10) according to Claim 1, with the following additional feature: a. the support structure (36) has a plurality of support surfaces (38).

3. Discharge head (10) according to Claim 1 or 2, with the following additional feature: a. the at least one ventilation opening (28) is arranged circumferentially between the ribs (39).

4. Discharge head (10) according to one of Claims 1 to 3, with at least one of the following additional features: a. the valve lip (90) has a widening shape, wherein a straight line between a contact surface (94) at the distal end of the valve lip (90) and the valve lip root (92) on the pump chamber component (80) encloses an angle between 30° and 60° with the actuating direction (2).

5. Discharge head (10) according to one of the preceding claims, with the following additional feature: a. the discharge head has a thread (34) to fasten it to the liquid reservoir (112).

6. Discharge head (10) according to one of the preceding claims, with the following additional feature: a. the pump chamber component (80) has a region formed as a bellows (81).

7. Discharge head (10) according to one of the preceding claims, with the following additional features: a. the valve bridge (42) rises over a surrounding radially extended cover wall (24) of the base, and b. on the surrounding cover wall (24), a reinforcement structure (26) provided on the outer side on an upper side of the cover wall (24) is provided, preferably in the form of a circumferential reinforcing web, and / or the circumferential valve bridge (42) is part of a sleeve-shaped structure which forms the circumferential valve bridge (42) above the cover wall (24) and which continues below the cover surface in a circumferential wall portion (46) which is aligned with the valve bridge (42).

8. Discharge head (10) according to Claim 7, with the following further feature: a. the at least one ventilation opening (28) is provided in an annular wall (48) which adjoins the wall portion (46) at the lower end.

9. Discharge head (10) according to Claim 7 or 8, with the following further feature: a. the discharge head (10) has, on the underside of the cover wall (24), a contact surface (30) preferably provided with a seal for a container neck of a liquid reservoir, wherein the contact surface (30) is delimited on the inner side by the circumferential wall portion (46).

10. Discharge head (10) according to Claim 7, 8 or 9, with the following further feature: a. an underside, lying opposite the reinforcement structure (26), of the cover wall (24) is provided for contact with a reservoir stub or bottle neck of the liquid reservoir (112) after coupling the liquid reservoir (112).

11. Liquid dispenser (100) for the discharge of pharmaceutical or cosmetic liquids, with the following features: a. the liquid dispenser has a liquid reservoir, and b. the liquid dispenser has a discharge head, characterized by the following further feature: c. the discharge head is configured according to one of the preceding claims.

12. Liquid dispenser (100) according to Claim 11, with at least one of the following additional features: a. the liquid reservoir has an internal volume between 100 ml and 500 ml, and / or b. the liquid reservoir is filled with a cosmetic product, in particular a gel-like skin care product or hair care product.