Dispenser for dispensing a fluid

Abstract

The invention is concerned with the dispenser (1) for dispensing a fluid (F), with a pump device which has a pump chamber (2), an inlet valve and an outlet valve (3, 4) and a pump piston (5) with a longitudinal axis (x), wherein a fluid pressure is generated during a pumping process for dispensing fluid (F) and the outlet valve (4) has a sealing position in which it rests sealingly against the pump piston (5). In order to provide a dispenser (1) advantageously designed, it is proposed that the outlet valve (4) can be moved relative to the pump piston (5) while maintaining the sealing position and can be deformed by the fluid pressure in a radial direction relative to the longitudinal axis (x) for the passage of fluid (F).

Description

TitleDispenser for Dispensing a FluidField of Invention

[0001] The invention relates to a dispenser for dispensing a fluid, with a pump device which has a pump chamber, an inlet valve and an outlet valve and a pump piston with a longitudinal axis, with a fluid pressure being generated during a pumping process for dispensing fluid and the outlet valve having a sealing position in which it rests sealingly against the pump piston.State of the Art

[0002] With regard to the state of the art, reference is made to US 6053364 Al. In the pump piston of the dispenser known from this, a sealing seat is formed for the outlet valve, through which the outlet valve is dragged along in the seal- ing position during the movement of the pump piston.

[0003] In a dispenser known from WO 2018 / 024657 Al (US 2019 / 0151 877 Al), an inwardly protruding sealing collar is formed on the pump piston, which acts on a sealing projection of a piston rod, in order to form the sealing position of the outlet valve, the piston rod acting on the pump piston via an interposed compression spring. Due to the fluid pressure during a pumping process, the pump piston moves relative to the sealing projection and thereby opens a path for dispensing fluid in the manner of a slide valve.Field of Technology

[0004] Starting from the first-mentioned prior art, the object of the invention is to specify a dispenser that is advantageously designed.

[0005] To solve this object, it is provided in particular that the outlet valve can be moved relative to the pump piston while maintaining the sealing position and can be deformed in a radial direction relative to the longitudinal axis for passage of fluid by the fluid pressure. In the sealing position, the outlet valve can correspondingly interact with the pump piston in a sliding manner.

[0006] Provision can also be made for the outlet valve to have a sealing position and a dispensing position in which fluid is dispensed. In the sealing position, a sealing section can bear against the pump piston over an entire circumference. In the dispensing position, the sealing section can be deformed at least partially with respect to the circumference in a radial direction relative to the longitudinal axis by the fluid pressure in such a way that it and thus the outlet valve are at least partially lifted from the pump piston for the passage of the fluid.

[0007] The interaction is advantageously provided in a through-opening of the pump piston, which also serves to conduct the fluid through for dispensing the fluid. In the sealing position, the outlet valve can interact with a wall of the through-opening that forms the through-opening, preferably without a stop, over a longitudinal distance extending in a flow direction of the fluid.

[0008] The deformability can be given radially inwards.

[0009] The through-opening can be formed with the same cross-sectional area over the longitudinal distance.

[0010] The outlet valve can move in the longitudinal distance sliding along the wall not only when fluid is sucked into the pump chamber, during which process the outlet valve is in the sealing position, but also when fluid is dispensedfrom the dispenser, in which case the outlet valve allows fluid to pass through due to the fluid pressure. The through opening may be formed in a tube portion of the pump piston. A separate valve seat is not formed in the area covered over the longitudinal distance.

[0011] According to a further possible embodiment, it is provided that the outlet valve is designed as a lip valve. A first valve wall of the outlet valve, which forms the lip of the lip valve, preferably rests against the wall with only one end of the first valve wall resting on the wall.

[0012] According to a further possible embodiment, it is provided that the fluid flowing out of the pump chamber can flow over a whole circumference around the outlet valve. It is not necessary, and generally not given, for the outlet valve to be completely lifted off the wall circumferentially by the fluid when fluid is dispensed. However, there is the possibility that the first valve wall may lift off in one or more areas of the circumference, which may differ in successive uses of the dispenser, for the passage of fluid.

[0013] According to another possible embodiment, it is provided that the fluid flowing into the pump chamber can flow over a whole circumference around the inlet valve. In this case, the inlet valve is preferably designed as a stopper valve. It can have a conically tapering second valve wall, with which it can sit in a correspondingly designed, conically widening valve seat of the pump chamber, in the inlet region of the pump chamber, in the closed state.

[0014] According to a further possible embodiment, it is provided that the outlet valve has an elastically deformable first valve wall. In any case, in the case of the design as a lip valve, this is already the case with a suitably thin design.Forming the outlet valve from a corresponding soft plastic allows corresponding deformability to be achieved even without forming a lip.

[0015] According to a further possible embodiment, it is provided that the first valve wall can be deformed approximately perpendicularly to a flow direction of the fluid when fluid is dispensed for the passage of the fluid. In the case of a location in the through-opening, the first valve wall moves, generally in a partial area, towards a center of the through-opening.

[0016] According to a further possible embodiment, it is provided that the first valve wall can be deformed over an entire circumference approximately perpendicularly to a flow direction of the fluid flowing out of the pump chamber.

[0017] According to a further possible embodiment, it is provided that the outlet valve is designed with a valve wall that runs in a V-shape in a longitudinal cross section. In this way, it is possible to achieve the same property over the circumference with regard to the sealing effect and the passage of fluid. At the tapered end of the V, the valve wall can merge into a, preferably central, stem section.

[0018] According to a further possible embodiment, it is provided that the wall is designed cylindrically and / or with a cylindrical inner surface. This also enables the outlet valve to be designed with a circular cross section, at least in the area in which it interacts with the wall. Alternatively, a design that deviates from a circular shape, for example in the sense of an oval, based on a cross section, is also possible.

[0019] The inlet valve and the outlet valve are preferably connected to one another. The inlet valve and the outlet valve can initially be coupled to oneanother in a displaceable manner, as is also known per se from the prior art mentioned at the outset. According to a further possible embodiment, it is preferably provided that the inlet valve and the outlet valve are designed as a valve unit. The inlet valve and the outlet valve are formed in one piece with each other. They can be designed to be elastically displaceable relative to one another. However, a rigid connection is preferred.

[0020] According to a further possible embodiment, it is provided that the inlet valve and the outlet valve are formed opposite one another in a direction of movement of the pump piston on a rod-like connecting body. It is preferably a straight, rod-like connecting body. The inlet valve and the outlet valve can thus form a respective end of the rod-like connecting body. The inlet valve and the outlet valve can be arranged in alignment with one another.

[0021] According to a further possible embodiment, it is provided that the inlet valve and the outlet valve can only be moved together in or against the direction of flow. For example, a movement of the inlet valve from the closed position to the open position moves the outlet valve at the same time and to the same extent.

[0022] According to a further possible embodiment, it is provided that the inlet valve has a larger effective pressure area than the outlet valve with regard to pressurization by the fluid in the pump chamber. This ensures, in particular during a dispensing process, that the inlet valve is acted upon in the closed position.Brief Description of the Drawing

[0023] The invention is further explained below with reference to the illustrated exemplary embodiments:Fig. 1 a cross section through the dispenser in an initial position, after the use has taken place; Fig. 2 an illustration according to Fig. 1, of another embodiment;Fig. 3 the dispenser in a cross section according to Fig. 1 with dispensing of fluid;Fig. 4 the dispenser in a cross section according to Fig. 1, fluid being sucked into the pumping chamber; Fig. 5 a cross section through the dispenser according to Fig. 1, along line V-V;Fig. 6 a cross section through the dispenser according to Fig. 1, along the line VI-VI;Fig. 7 a cross section through the dispenser according to Fig. 1, along line VII-VII; andFig. 8 an illustration of a modified pump head for a dispenser according to Fig. 1 or Fig. 2.Description of the Embodiments

[0024] A dispenser 1 is shown and described. The dispenser 1 is particularly for dispensing a fluid F by spraying. The fluid F can be, in particular, an aqueous liquid. As is predominantly shown, compare in particular Figs. 1 and 2, it can be a sprayer with a discharge opening on the end face, which is used in particular as a nasal sprayer. However, as shown in Fig. 8, it can also be a dispenser or sprayer with a lateral dispensing opening.

[0025] The dispenser 1 has a pumping device which comprises a pumping chamber 2, an inlet valve 3 and an outlet valve 4. A pump piston 5 is also provided, which can be moved between an initial position according to Fig. 1 or Fig. 2 and an operating position in which fluid is dispensed, Fig. 3.

[0026] The outlet valve 4 is designed to be elastically deformable.

[0027] The pump piston 5 can be moved against a restoring force of a spring 6. In the exemplary embodiment in Fig. 1, the spring 6 is designed as a bellows spring. In the embodiment of Fig. 2, the spring 6 is designed as a helical spring. Both Figs. 1 and 2 show a rest position of the dispenser. As a rule, such rest position is given after a dispensing of fluid F has taken place. Due to an entrainment effect between the outlet valve 4 and the pump piston 5, in case the valves are combined, e.g. according to the shown embodiments, the inlet valve 3 is moved out of its valve seat.

[0028] The pump piston 5 interacts with the outlet valve 4 in a sealing position according to Fig. 1 or Fig. 2 and accordingly also Fig. 4 without a stop and also in a sliding manner. When fluid F is sucked back into the pump chamber 2, see for example Fig. 4, the outlet valve 4 is in the sealing position and the pumppiston 5 moves - with reference to Fig. 4 - upwards, with sliding interaction with the outlet valve 4. The interaction can advantageously with a through- opening 7 of the pump piston 5, which also serves to conduct the fluid F through. For this purpose, the outlet valve 4 can rest against a wall 8 forming the passage opening 7, specifically an inner surface 9 formed by the wall 8.

[0029] When fluid F is sucked into the pump chamber 2, the outlet valve 4 moves relative to the pump piston 5 to an end of the pump piston 5 on the pump chamber side, there is also a favorable suck-back effect, so that dripping is prevented, for example. In any case, this is the case when, as is preferred, no further valve or a valve-like closure is formed on the output side.

[0030] The sliding interaction results when the pump piston 2 is pressed down and also when it is returned. The pump piston 2 has a longitudinal axis x, which is preferably also a central axis of the through-opening 7.

[0031] As can be seen from a comparison of Figs. 1, 2 and 3, for example, the outlet valve 4 is deformed when fluid F is dispensed, namely radially inwards in the exemplary embodiment, with regard to the direction of the longitudinal axis x. In many configurations of the outlet valve 4, the deformation is not as severe and / or not as uniform (opposite) as shown in Fig. 3. In particular, the outlet valve 4 can also rest against the inner surface 9 of the pump piston 5 during the opposite deformation, as shown in Fig. 3, in a cross section turned 90 degrees concerning the longitudinal axis x.

[0032] The outlet valve 4 is designed for the fluid F to flow around in a displacing manner. The outlet valve 4 is designed to be deformable for this purpose.

[0033] The outlet valve 4 can have a sealing section d, with which it rests against the pump piston 5 over an entire circumference in the sealing position, see for example Figs. 1 and 2. In a dispensing position of the outlet valve 4, see also Fig. 3, the sealing section d is at least partially lifted off the pump piston 5 over the circumference.

[0034] The outlet valve 4 can also be in direct contact with the wall 8 over a substantial peripheral area when fluid F is being dispensed. A position of the outlet valve 4 in which a passage of fluid F is possible can also be a sealing position at the same time. Whether there is a passage or a seal is preferably controlled solely by the fluid pressure of the fluid F. When fluid F is sucked into the pump chamber 2, a negative pressure is present at the outlet valve 4.

[0035] Preferably, as explained in detail further below, the outlet valve 4 is also designed in detail in such a way that a sealing effect that tends to be higher is achieved in the case of negative pressure.

[0036] The outlet valve 4 interacts with the pump piston 5 over a longitudinal distance 1 extending in a flow direction S of the fluid F. The through-opening 7 can be formed with the same cross-sectional area over the longitudinal distance 1, such as in the exemplary embodiment. In addition, the through-opening 7 is also straight, at least over the longitudinal distance 1, with an inner surface 9 running parallel to the longitudinal axis x. The cross-sectional area reflecting the free cross-section is always penetrated by the longitudinal axis x of the through-opening 7 at a geometrically identical point over the longitudinal distance 1.

[0037] The longitudinal distance 1 preferably corresponds to the path that the pump piston 5 travels from an initial position, compare, for example, Fig. 1 and2, into which it is pressed by the spring 6, to a lowest position, compare, for example, Fig. 3.

[0038] The longitudinal distance 1 additionally or alternatively preferably corresponds approximately to an inner diameter of the through-opening 7.

[0039] The outlet valve 4 can move in the longitudinal distance 1 along the wall 8 not only when fluid F is sucked into the pump chamber 2, Fig. 4, during which process the outlet valve 4 is in the sealing position, but also when fluid is dispensed from the dispenser 1, Fig. 3. It can also be in direct contact with the wall 8 over a significant peripheral area when fluid F is dispensed.

[0040] The outlet valve 4 has preferably, and in the exemplary embodiment, in the sealing position no other configuration than when fluid F is dispensed, except for some deformation. An actual open position, as is otherwise usually the case with an outlet valve when fluid F is allowed to pass through, is not given. The passage of fluid F is preferably achieved only by elastically pushing back the outlet valve 4 from the wall 8.

[0041] The fluid F preferably has the same direction in the direction of flow S in front of and behind the outlet valve 4. The outlet valve 4 is preferably only flowed around; it does not block any opening leading to a diversion of the fluid F.

[0042] The pump piston 5 and thus also the through-opening 7 can be formed by a tubular section of the pump piston 5, as in the exemplary embodiment. A separate valve seat - for the outlet valve 4 - is not formed over the longitudinal distance 1.

[0043] The tubular section can have over its length, which in any case preferably exceeds the longitudinal distance 1, different - free - cross-sectional areas. Thus, a funnel-shaped inlet region 12 facing the pump chamber 2 can adjoin the longitudinal distance 1 and / or a first tubular section also forming the longitudinal distance 1 can merge into a second tubular section of reduced diameter.

[0044] Furthermore, the pump piston 5 has sealing lips 10 in the usual way, which interact with an inner surface of the pump chamber 2.

[0045] As in the exemplary embodiment, the outlet valve 4 can be designed as a lip valve. A first valve wall 11 of the outlet valve 4 forming the lip valve preferably rests against the wall 8 or the inner surface 9 only with one end of the first valve wall 11 assigned to the wall 8. The resting against the wall 8 can be given under prestress.

[0046] As in the exemplary embodiment, the outlet valve 4 can be completely surrounded by the fluid F flowing out of the pump chamber 2. As a rule, however, it is not the case that the outlet valve 4 is completely lifted off the wall 8 circumferentially at the same time in an open position or when fluid F is dispensed due to the ability of the fluid F to flow around it. However, there is the possibility that the first valve wall 11 for the passage of fluid F is lifted in one or more areas of the circumference, which can also be different in successive uses of the dispenser 1 and can in principle encompass the entire circumference.

[0047] The inlet valve 3 is preferably and in the exemplary embodiment formed as a plug valve. It can have a valve body 13 which forms a second valve wall 14. The second valve wall 14 can be designed to taper conically counter to the direction of flow S. The second valve wall 14 can interact with a correspondingly shaped counter sealing surface 15 in the pump chamber 2 as a valve seat.The inlet valve 3 is preferably formed as a solid body. The counter sealing surface 15 can rest against the conical second valve wall 14 in a sealing position and / or against a lower wall section of the valve body 13 running essentially perpendicularly to the direction of flow S.

[0048] The fluid F flowing into the pump chamber 2 can also be able to completely flow around the inlet valve 3 in terms of its circumference. This relates to the second valve wall 14. Also with regard to the inlet valve 3, it is preferred that the direction of flow S in front of and behind the inlet valve 3 has the same direction. The inlet valve 3 also preferably does not block any opening that would result in the fluid F being diverted, changing the direction of flow S.

[0049] The first valve wall 11 of the outlet valve 4 can be elastically deformable. In any case, in the case of the design as a lip valve, this is already the case with a suitably thin design. Forming the outlet valve 4 from a corresponding soft plastic allows a corresponding deformability to be achieved even without a lip formation, as a solid body.

[0050] The first valve wall 11 is more preferably also a part of the outlet valve 2 that projects furthest away from the pump chamber 2.

[0051] Provision can be made for the first valve wall 11, as in the exemplary embodiment, to deform approximately perpendicularly to the direction of flow S of the fluid F, and at the same time also perpendicularly or radially to the longitudinal axis x, when fluid F is dispensed for the passage of the fluid F. The first valve wall 11 hereby moves, generally in a partial area, towards a center of the passage opening 7.

[0052] As in the exemplary embodiment, it can be provided that the first valve wall 11 can be deformed over an entire circumference approximately perpendicular to a direction of movement of the fluid F flowing out of the pump chamber.

[0053] As in the exemplary embodiment, it can be provided that the outlet valve 4 is formed with a first valve wall 11 running in a V-shape in a longitudinal cross section. A design that is bell-shaped, for example, in cross section, is also possible. In this way, it is possible to achieve the same property over the circumference with regard to the sealing effect and the passage of fluid. In the closed position, in which a negative pressure is present when fluid F is sucked into the pump chamber 2, this also advantageously results in an intensification of the sealing effect.

[0054] The first valve wall 11 can transition into a, preferably central, stem section 16 at the tapered end of the V.

[0055] It can be provided, as in the exemplary embodiment, that the wall 8, preferably at least the inner surface 9, is designed as a cylindrical surface at least in the length region 1. This also enables the outlet valve 4 to have a circular configuration in terms of its circumference, at least in the area in which it interacts with the wall 8. Alternatively, a design that deviates from a circular shape, for example in the sense of an oval, a rectangle or a free form, is also possible. The outlet valve 4 is then, at least in its area of interaction with the wall 8 or the inner surface 9, designed correspondingly in terms of geometry.

[0056] The inlet valve and the outlet valve 3, 4 can, as in the exemplary embodiment, be slidably coupled to one another. Preferably, as in the exemplary embodiment, it is provided that the inlet and outlet valves 3, 4 are designed as avalve unit. They are connected to one another in one piece. They can be connected to one another in an elastically displaceable manner. However, a rigid connection is preferred, as in the exemplary embodiment.

[0057] The valve unit passes through the pump chamber 2, preferably centrally, more preferably with a central axis corresponding to the longitudinal axis x.

[0058] More preferably, as in the exemplary embodiment, the inlet and outlet valves 3, 4 are formed opposite one another on a rod-like connecting body 17 in relation to the rigid connection in a direction of movement of the pump piston 5, or in the direction of flow S. The stem section 16 may form part of the connecting body 17.

[0059] It is preferably a straight rod-like connecting body 17. The inlet and outlet valves 3, 4 more preferably form a respective end of the rod-like connecting body 17, possibly with the exception of the guide projection 18, see below. The inlet and outlet valves 3, 4 are also preferably arranged in alignment with one another. In a viewing direction along a direction of extension of the connecting body 17, they are thereby in a superimposed position, although preferably not with the same contours. Predominantly, only the connecting body 17 passes through the pump chamber 2.

[0060] As in the exemplary embodiment, it can be provided that the inlet valve and the outlet valve 3, 4 can only be moved together in or against the direction of flow S. When the inlet valve 3 moves from the closed position to the open position, for example, the outlet valve 4 moves at the same time and to the same extent.

[0061] It can be provided, as in the exemplary embodiment, that the inlet valve 3 has a larger effective pressure area FE with regard to pressure being applied by the fluid F than it corresponds to an effective pressure area FA of the outlet valve 4. This ensures, in particular during a dispensing process, that the inlet valve 3 is acted upon in the closed position.

[0062] The inlet valve 3 can have the above- mentioned projecting guide projection 18 in the closing direction, counter to the direction of flow S. The guide projection 18 is particularly advantageous in terms of assembly technology. It can also bring about a favorable central guidance of the inlet valve 3 in pump operation. The guide projection 18 can correspondingly form the end of the valve unit on the intake valve 3 side.

[0063] With the possible exception of the guide projection 18, the inlet valve 3 and the outlet valve 4 preferably form the opposite ends of the valve unit.

[0064] The valve unit is preferably not attached to the dispenser or the specifically to the pump chamber 2 or to the pump piston 5, but movably, to a limited amount, held within the dispenser.

[0065] The dispenser 1 can also have a connecting part 19 for connecting the pumping device to a vessel 20 containing the fluid F. The connecting part 19 can be designed for being latched on the vessel 20.

[0066] The pumping chamber 2 can be latched to the connecting part 19. For this purpose, the pump chamber 2 can have one or more latching projections 21, optionally circumferential, which engage in a latching grip 22 of the connecting part 19.

[0067] The connecting part 19 can be seated on an end face of the vessel 20 with the interposition of a seal, preferably embodied here as a sealing disk 23. The connecting part 19 can be seated with a preferably circumferential, advantageously annular plate section 44 on an end face of the vessel 20 or the sealing disk 23.

[0068] The connecting part 19 can also have a guide section 24 for guiding the pump piston 5 passing through the connecting part 19.

[0069] The one or more latching projections 21 can be accommodated in a corner area open towards the pump chamber 2 between the guide section 24 and the plate section 44, formed by a transition section of the connecting part 19.

[0070] The pump chamber 2 can further have a retaining projection 25 for the valve unit, which is formed above the inlet valve 3 when the inlet valve 3 is in the closed state. As can also be seen in further detail from Fig. 6, a plurality of retaining projections 25 can be formed over the circumference, leaving flow areas between them. Preferably, there are two projections 25 and two remaining flow areas. At the embodiment shown are four projections 25 and four remaining flow areas.

[0071] According to the embodiment of Fig. 2, a retaining projection 25 that runs continuously over the circumference can also be provided. In this case, it is then advantageous to form a radially protruding retaining collar 46 on the valve body of the inlet valve 3, which has passages 47 in order to allow the desired passage of fluid F when the inlet valve 3 is in the open state. Even though the valve body in the embodiment of Fig. 1 does not have a separate retaining collar 46, but rather tapers conically downwards starting from an upper region pref-erably designed as a round body, a retaining collar 46 can also be formed there. In this case, it is preferably designed to be closed around the circumference.

[0072] The retaining projection or projections 25 can limit a movement of the intake valve 3 in the opening direction of the intake valve 3. Due to the preferred design of the inlet and outlet valve 3, 4 as a valve unit, the movability of the inlet and outlet valve 3, 4 together is then limited at the same time. There is no need for any particular limitation with regard to the mobility of the outlet valve 4.

[0073] The retaining projection or projections 25 can be the sole means to held the valve unit.

[0074] A measure of the possible movement of the inlet valve 3 or the valve unit and thus (also) of the outlet valve 4 is preferably significantly smaller than the longitudinal distance 1. It can correspond to half or less of the longitudinal distance 1. For example it can be one tenth to one third thereof.

[0075] A suction tube 26 can also be provided. The suction tube 26 allows the vessel 20 to be emptied in a known manner.

[0076] The pump chamber 2, a component forming the pump chamber 2, can have an end region designed as a mounting section 27 for the suction tube 26.

[0077] A flow section 28 can be formed in front of the inlet valve 3 in the flow direction S of the fluid F into the pump chamber 2. The flow section 28 can have a guide area 29 for the guide projection 18 and, in cross section, a radial expansion 30. In this regard, reference is also made to Fig. 7.

[0078] The flow section 28 can be formed after the mounting section 27 in the flow direction S.

[0079] The pump unit can also have a distribution body 31. The distribution body 31 can connect to the pump piston 5 in the direction of flow S. The distribution body 31 can be plug-connected to the pump piston 5.

[0080] The pump unit can further have a nozzle part 32. The nozzle part 32 can be covered by a closure cap 33 when not in use.

[0081] The nozzle part 32 can have an outlet opening 34. The distribution body 31 can be arranged inside the nozzle part 32.

[0082] The distribution body 31 can have a spray formation, such as that shown in Fig. 5. Channels 35 running radially can be provided, which open into a central dispensing area 36. The outlet opening 34 can be formed adjoining the dispensing area 36 in the direction of the longitudinal axis x.

[0083] A first latching mount 37 can be formed between the distribution body 31 and the nozzle part 32.

[0084] A fluid space 40 can be formed between an outer wall 38 of the distribution body 31 and an inner wall 39 of the nozzle part 32. A transverse channel 45 opening into the fluid space 40 can be formed in front of the dispensing area 36 as seen in the direction of flow S, but after the latching mount 37. At the same time, the transverse channel 45 can represent an end region of the through- opening 7 extending in the direction of the longitudinal axis x, possibly an extension of the through-opening 7 in the distributor body 31.

[0085] The first latching mount 37 can at the same time seal the fluid space 40.

[0086] On the pump chamber side, the nozzle part 32 can merge into an actuating surface 41 for manual actuation of the pump unit.

[0087] The distribution body 31 can be held in place in the nozzle part 32 on two latching mounts spaced apart from one another in the direction of flow S of the fluid F, the first 37 and a second latching mount 42.

[0088] The pump piston 5 can be plugged into a receiving opening 43 of the distribution body 31.

[0089] The second latching mount 42 can be configured to surround the receiving opening 43, seen perpendicularly to the direction of flow S of the fluid F.

[0090] The spring 6 can act between the nozzle part 32 and the connecting body 17. The spring 6 is preferably arranged outside the pump piston 5, more preferably surrounding the pump piston 5. The spring 6 preferably does not extend in an area through which fluid F flows.

[0091] The spring 6 can, if it is designed as a helical spring, be designed as a single-threaded spring, meaning having one coil.

[0092] All parts of the dispenser 1 are preferably plastic parts. In particular, the nozzle part 32, the distribution body 31 and the pump chamber 2 can consist of a first same plastic, as can the closure cap 33, the pump piston 5, the spring 6, especially if it is a bellows spring, the sealing disk 27, the valve unit or the inlet and outlet valve 3, 4, and the intake manifold 26 consist of a second plastic ofthe same type. The first same plastic can be polypropylene (PP) and the second same plastic can be polyethylene (PE).List of Reference Numerals1 dispenser 29 guide area2 pump chamber 30 radial expansion3 inlet valve 31 distribution body4 outlet valve 32 nozzle part5 pump piston 33 closure cap6 spring 34 outlet opening7 through-opening 35 channel8 wall 36 dispensing area9 inner surface 37 first latching mount10 sealing lip 38 outer wall11 first valve wall 39 inner wall12 inlet region 40 fluid space13 valve body 41 actuating surface14 second valve wall 42 second latching mount15 counter sealing surface 43 receiving opening16 stem section 44 plate section17 connecting body 45 transverse channel18 guide projection 46 retaining collar19 connecting part 47 passage20 vessel21 latching projection22 latching grip23 sealing disk F fluid24 guide section FA effective pressure area inlet25 retaining projection valve26 suction tube FE effective pressure area outlet27 mounting section valve28 flow section S flow directiond sealing section1 longitudinal distance x longitudinal axis

Claims

Claims1. Dispenser (1) for dispensing a fluid (F), with a pump device which has a pump chamber (2), an inlet valve and an outlet valve (3, 4) and a pump piston (5) with a longitudinal axis (x), wherein a fluid pressure is generated during a pumping process for dispensing fluid (F) and the outlet valve(4) has a sealing position in which it rests sealingly against the pump piston (5), characterized in that, the outlet valve (4) can be moved relative to the pump piston (5) while maintaining the sealing position and can be deformed by the fluid pressure in a radial direction relative to the longitudinal axis (x) for the passage of fluid (F).

2. Dispenser (1) for dispensing a fluid (F), with a pump device, the pump device having a pump chamber (2), an inlet valve, an outlet valve (3, 4) and a pump piston (5) with a longitudinal axis (x), wherein a fluid pressure is generated during a pumping process for dispensing fluid (F) and the outlet valve (4) has a sealing position and a dispensing position, the outlet valve (4) in the sealing position, in a sealing section (d), over an entire circumference rests against the pump piston (5) and in the dispensing position, the outlet valve (4), by the fluid pressure, is at least partially deformed with respect to the circumference in a radial direction relative to the longitudinal axis (x), whereby the sealing section (d) is lifted at least partially from the pump piston (5), to allow the fluid (F) to pass.

3. Dispenser according to one of the preceding claims, characterized in that the outlet valve (4 is movable in a through-opening (7) of the pump piston(5), which also serves to conduct the fluid (F).

4. Dispenser according to claim 3, characterized in that the outlet valve (4) is deformable radially inwards.

5. Dispenser according to one of the preceding claims, characterized in that the outlet valve (4) is designed as a lip valve.

6. Dispenser according to one of the preceding claims, characterized in that fluid (F) flowing out of the pump chamber (2) can flow around an entire circumference of the outlet valve (4).

7. Dispenser according to one of the preceding claims, characterized in that fluid (F) flowing into the pump chamber (2) can flow around an entire circumference of the inlet valve (3).

8. Dispenser according to one of the preceding claims, characterized in that the outlet valve (4) has an elastically deformable first valve wall (11).

9. Dispenser according to claim 8, characterized in that the first valve wall (11) can deform over an entire circumference approximately perpendicular to the flow direction (S) of the fluid (F) flowing out of the pump chamber (2).

10. Dispenser according to one of the preceding claims, characterized in that the first valve wall (11) is designed to run in a V-shape in a longitudinal cross section.

11. Dispenser according to one of the preceding claims, characterized in that the wall (8) is cylindrical.

12. Dispenser according to one of the preceding claims, characterized in that the inlet and outlet valves (3, 4) are designed as a valve unit.

13. Dispenser according to claim 12, characterized in that the inlet and outlet valves (3, 4) are formed opposite one another in a direction of movement of the pump piston (5) on a rod-like connecting body (17).

14. Dispenser according to one of claims 12 or 13, characterized in that the inlet and outlet valves (3, 4) can only be moved together in or against the direction of flow (S).

15. Dispenser according to one of the preceding claims, characterized in that the inlet valve (3) has a larger effective pressure area (FA) than the outlet valve (4) with regard to pressurization by the fluid (F) in the pump cham- ber (2).

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