CA3158567A1 - Foam pump - Google Patents
Foam pumpInfo
- Publication number
- CA3158567A1 CA3158567A1 CA3158567A CA3158567A CA3158567A1 CA 3158567 A1 CA3158567 A1 CA 3158567A1 CA 3158567 A CA3158567 A CA 3158567A CA 3158567 A CA3158567 A CA 3158567A CA 3158567 A1 CA3158567 A1 CA 3158567A1
- Authority
- CA
- Canada
- Prior art keywords
- valve
- pump
- chamber
- foam
- foam pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000006260 foam Substances 0.000 title claims abstract description 130
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 235000014676 Phragmites communis Nutrition 0.000 claims description 34
- 230000009471 action Effects 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 description 10
- 239000000344 soap Substances 0.000 description 6
- 239000000645 desinfectant Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000004913 activation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/0005—Components or details
- B05B11/0062—Outlet valves actuated by the pressure of the fluid to be sprayed
- B05B11/007—Outlet valves actuated by the pressure of the fluid to be sprayed being opened by deformation of a sealing element made of resiliently deformable material, e.g. flaps, skirts, duck-bill valves
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
- A47K5/00—Holders or dispensers for soap, toothpaste, or the like
- A47K5/14—Foam or lather making devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
- B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
- B05B11/1001—Piston pumps
- B05B11/1004—Piston pumps comprising a movable cylinder and a stationary piston
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
- B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
- B05B11/1087—Combination of liquid and air pumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
- B05B11/0005—Components or details
- B05B11/0027—Means for neutralising the actuation of the sprayer ; Means for preventing access to the sprayer actuation means
- B05B11/0032—Manually actuated means located downstream the discharge nozzle for closing or covering it, e.g. shutters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/0018—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam
- B05B7/0025—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam with a compressed gas supply
- B05B7/0031—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam with a compressed gas supply with disturbing means promoting mixing, e.g. balls, crowns
- B05B7/0037—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam with a compressed gas supply with disturbing means promoting mixing, e.g. balls, crowns including sieves, porous members or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/0018—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam
- B05B7/0025—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam with a compressed gas supply
- B05B7/0031—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam with a compressed gas supply with disturbing means promoting mixing, e.g. balls, crowns
- B05B7/0043—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with devices for making foam with a compressed gas supply with disturbing means promoting mixing, e.g. balls, crowns including a plurality of individual elements, e.g. needles, baffles, rotatable blades
Landscapes
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
- Reciprocating Pumps (AREA)
- Closures For Containers (AREA)
Abstract
The invention relates to a foam pump (1) for arranging on a container filled with liquid. The foam pump (1) comprises a valve support (10), an inlet valve (11), and a valve tube (12) which is arranged on or at least partly in the valve support (10) so as to be able to carry out a stroke movement, thereby changing the volume in a pump chamber (13), whereby liquid can flow from the container into the pump chamber (13) via the inlet valve (11). The foam pump (1) additionally comprises a pump bellows (15) with an air chamber (14) and a mixing chamber (16) which is fluidically connected to the air chamber (14) and the pump chamber (13). A duckbill valve (21) through which liquid can flow from the pump chamber (13) into the mixing chamber (16) in the event of a stroke movement of the valve tube (12) relative to the valve support (10) is arranged between the pump chamber (13) and the mixing chamber (16). Furthermore, a flatter valve (24) through which air can flow from the air chamber (14) in the pump bellows (15) into the mixing chamber (16) in the event of a stroke movement of the valve tube (12) relative to the valve support (10) is arranged between the air chamber (14) in the pump bellows (15) and the mixing chamber (16).
Description
Foam pump The invention relates to a foam pump for arranging on a container filled with liquid, having the features in the preamble of claim 1.
PRIOR ART
Many kinds of foam pumps are known from the prior art and are used to produce a foam from a foamable liquid medium, for example a liquid soap or a foamable disinfectant solution, by mixing it with air, said foam being able to be dispensed for example into a user's hand upon actuation of the foam pump. Here, foam pumps are known which can take the liquid from a flexible container, for example from a pouch. In addition, foam pumps are known which can suck the liquid out of a dimensionally stable container and thus evacuate the latter.
A non-evacuating foam pump is known for example from the document EP 2 127 756 Al. The foam pump has a mixing chamber into which, upon actuation of a pump bellows, air can be introduced through a duckbill valve. From the container, after a pumping operation, the liquid runs back into the mixing chamber under gravity from a container arranged above the mixing chamber.
Evacuating foam pumps are usually designed either for dispensing foam soap or for dispensing foam disinfectant.
Universally usable foam pumps which can pump or suck both a foam soap and foam disinfectant have a complex structure compared therewith and contain components which do not allow easy disposal. For example, in such foam pumps, metal springs or glass beads are used as tensioning elements and nonreturn valves.
Date Recue/Date Received 2022-04-22
PRIOR ART
Many kinds of foam pumps are known from the prior art and are used to produce a foam from a foamable liquid medium, for example a liquid soap or a foamable disinfectant solution, by mixing it with air, said foam being able to be dispensed for example into a user's hand upon actuation of the foam pump. Here, foam pumps are known which can take the liquid from a flexible container, for example from a pouch. In addition, foam pumps are known which can suck the liquid out of a dimensionally stable container and thus evacuate the latter.
A non-evacuating foam pump is known for example from the document EP 2 127 756 Al. The foam pump has a mixing chamber into which, upon actuation of a pump bellows, air can be introduced through a duckbill valve. From the container, after a pumping operation, the liquid runs back into the mixing chamber under gravity from a container arranged above the mixing chamber.
Evacuating foam pumps are usually designed either for dispensing foam soap or for dispensing foam disinfectant.
Universally usable foam pumps which can pump or suck both a foam soap and foam disinfectant have a complex structure compared therewith and contain components which do not allow easy disposal. For example, in such foam pumps, metal springs or glass beads are used as tensioning elements and nonreturn valves.
Date Recue/Date Received 2022-04-22
- 2 -The document EP 3 085 456 B1 discloses a generic foam pump for arranging on a container filled with liquid. The foam pump comprises a valve support, in which an inlet valve is received, and a valve pipe, which is received in the valve support so as to be able to carry out a stroke movement, changing a volume in a pump chamber. As a result of a stroke movement of the valve pipe relative to the valve support, liquid is transferred from the container into the pump chamber through the inlet valve.
Furthermore, the foam pump has a pump bellows with an air chamber from which air can flow into a mixing chamber during a stroke movement of the valve pipe. In the mixing chamber, the air is combined with the liquid. Thereafter, foam screens for foaming the liquid are arranged.
The known foam pump has the drawback of not being universally usable and being laborious and complex to assemble. Moreover, it has been found that the foam quality of the foam pump is satisfactory for only essentially one type of liquid. Furthermore, the foam pump has a large number of individual parts to be assembled together.
SUMMARY OF THE INVENTION
It is the object of the invention to develop a foam pump such that it is easy to dispose of without requiring laborious disassembly. Furthermore, the foam pump should be usable for different types of foamable liquids, for example for foam soap and for a foam disinfectant solution; in particular, the foam pump should be able to evacuate a container to provide the liquid.
This object is achieved proceeding from a foam pump according to the preamble of claim 1 in combination with the characterizing features. Advantageous developments of the invention are specified in the dependent claims.
Date Recue/Date Received 2022-04-22
Furthermore, the foam pump has a pump bellows with an air chamber from which air can flow into a mixing chamber during a stroke movement of the valve pipe. In the mixing chamber, the air is combined with the liquid. Thereafter, foam screens for foaming the liquid are arranged.
The known foam pump has the drawback of not being universally usable and being laborious and complex to assemble. Moreover, it has been found that the foam quality of the foam pump is satisfactory for only essentially one type of liquid. Furthermore, the foam pump has a large number of individual parts to be assembled together.
SUMMARY OF THE INVENTION
It is the object of the invention to develop a foam pump such that it is easy to dispose of without requiring laborious disassembly. Furthermore, the foam pump should be usable for different types of foamable liquids, for example for foam soap and for a foam disinfectant solution; in particular, the foam pump should be able to evacuate a container to provide the liquid.
This object is achieved proceeding from a foam pump according to the preamble of claim 1 in combination with the characterizing features. Advantageous developments of the invention are specified in the dependent claims.
Date Recue/Date Received 2022-04-22
- 3 -To achieve the object set out above, the invention provides that a duckbill valve is arranged between the pump chamber and the mixing chamber, through which duckbill valve liquid is able to flow from the pump chamber into the mixing chamber during a stroke movement of the valve pipe relative to the valve support, and that a reed valve is arranged between the air chamber and the mixing chamber, through which reed valve air is able to flow from the air chamber in the pump bellows into the mixing chamber during a stroke movement of the valve pipe relative to the valve support.
In this connection, the term "between" does not necessarily mean "spatially between". In other words, the duckbill valve does not need to be arranged spatially directly between the pump chamber and the mixing chamber.
Rather, the term "between" means that the duckbill valve is arranged with regard to the fluidic connection between the pump chamber and the mixing chamber. This is also the case, mutatis mutandis, for the reed valve and the arrangement thereof between the air chamber and the mixing chamber.
The central idea of the invention is an advantageous valve combination made up of a duckbill valve and a reed valve, wherein liquid can pass from the pump chamber into the mixing chamber via the duckbill valve, but the latter prevents liquid from passing from the mixing chamber back into the pump chamber. At the same time, the reed valve forms in a simple manner a valve for a gaseous medium.
According to the invention, the reed valve and the duckbill valve are configured and arranged such that, during a stroke movement, with which the volume of the pump chamber is reduced and at the same time the volume of the air chamber is reduced, they are transferred into their open position. In the open position, for the one part, liquid can be conveyed out of the pump chamber and Date Recue/Date Received 2022-04-22
In this connection, the term "between" does not necessarily mean "spatially between". In other words, the duckbill valve does not need to be arranged spatially directly between the pump chamber and the mixing chamber.
Rather, the term "between" means that the duckbill valve is arranged with regard to the fluidic connection between the pump chamber and the mixing chamber. This is also the case, mutatis mutandis, for the reed valve and the arrangement thereof between the air chamber and the mixing chamber.
The central idea of the invention is an advantageous valve combination made up of a duckbill valve and a reed valve, wherein liquid can pass from the pump chamber into the mixing chamber via the duckbill valve, but the latter prevents liquid from passing from the mixing chamber back into the pump chamber. At the same time, the reed valve forms in a simple manner a valve for a gaseous medium.
According to the invention, the reed valve and the duckbill valve are configured and arranged such that, during a stroke movement, with which the volume of the pump chamber is reduced and at the same time the volume of the air chamber is reduced, they are transferred into their open position. In the open position, for the one part, liquid can be conveyed out of the pump chamber and Date Recue/Date Received 2022-04-22
- 4 -from there into the mixing chamber, and for the other part, air can be conveyed from the air chamber into the mixing chamber. In other words, liquid and air pass simultaneously into the mixing chamber, in which they are mixed. During the reverse stroke movement, with which the volume of the pump chamber is increased and with which the pump bellows also relaxes again such that the volume of the air chamber is increased, both the reed valve and the duckbill valve close. In this way, it is possible to effectively prevent liquid and/or foam from passing from the mixing chamber into the air chamber, which would result in long-term contamination of the pump bellows and the air chamber formed therein. In addition, it is also possible to minimize the risk of air or the liquid/air mixture passing from the mixing chamber into the pump chamber, which would have a long-term negative effect on the evacuating action of the foam pump.
As a result, a simply embodied foam pump is formed, which, as a result of the variability of the volume of the pump chamber in conjunction with the inlet valve, can evacuate a chamber to provide the liquid to be foamed. The good sealing action which can be achieved in the foam pump according to the invention is in this case important not only for the evacuating action. Rather, the good sealing action also ensures that the liquid and the foam can each flow only in the conveying direction but not in the opposite direction. In particular, it is also possible to effectively prevent contaminants from passing into the foam pump or the container from the outside, as could otherwise, in the worst case, even result in microbial contamination. In addition, the foam pump according to the invention is characterized in that, on account of the materials of the constituents of the foam pump being selectable equally from the range of plastics, the foam pump can be disposed of without separating materials.
Date Recue/Date Received 2022-04-22
As a result, a simply embodied foam pump is formed, which, as a result of the variability of the volume of the pump chamber in conjunction with the inlet valve, can evacuate a chamber to provide the liquid to be foamed. The good sealing action which can be achieved in the foam pump according to the invention is in this case important not only for the evacuating action. Rather, the good sealing action also ensures that the liquid and the foam can each flow only in the conveying direction but not in the opposite direction. In particular, it is also possible to effectively prevent contaminants from passing into the foam pump or the container from the outside, as could otherwise, in the worst case, even result in microbial contamination. In addition, the foam pump according to the invention is characterized in that, on account of the materials of the constituents of the foam pump being selectable equally from the range of plastics, the foam pump can be disposed of without separating materials.
Date Recue/Date Received 2022-04-22
- 5 -Advantageously, the duckbill valve and/or the reed valve is/are received in the valve pipe, with the result that a compact structure can be realized.
The desired valve action of the reed valve can also be achieved in a simple manner when the reed valve is arranged so as to bear on the interior of the wall of the valve pipe. In particular, it is possible to provide that the reed valve bears fully against the inner wall, in the form for example of a cylinder barrel, of the valve pipe.
By means of an opening in the wall of the valve pipe, it is possible - depending on the valve control of the reed valve - for air to flow into the interior of the valve pipe, in which the mixing chamber can be directly formed.
Rather than one opening, it is also possible for a plurality of openings to have been introduced in the wall in a manner distributed around the circumference of the valve pipe. The reed valve can in this case be configured such that it directly covers the openings. However, it is also possible for the reed valve to not or at least not fully cover the openings. The sealing action of the reed valve can be achieved in this case in that, in its closed position, it bears sealingly against the inner wall and in this way separates the air chamber from the mixing chamber.
According to one embodiment according to the invention, the duckbill valve and the reed valve are in the form of a combination valve with a structurally integral and one-piece main body. In this way, a particularly simple structure with low assembly complexity can be realized.
The combination valve can in this case be inserted with its main body in the valve pipe.
The main body of the combination valve is preferably embodied such that it has a base portion and a shielding portion, wherein the shielding portion is integrally formed on the outer circumference of the base portion and Date Recue/Date Received 2022-04-22
The desired valve action of the reed valve can also be achieved in a simple manner when the reed valve is arranged so as to bear on the interior of the wall of the valve pipe. In particular, it is possible to provide that the reed valve bears fully against the inner wall, in the form for example of a cylinder barrel, of the valve pipe.
By means of an opening in the wall of the valve pipe, it is possible - depending on the valve control of the reed valve - for air to flow into the interior of the valve pipe, in which the mixing chamber can be directly formed.
Rather than one opening, it is also possible for a plurality of openings to have been introduced in the wall in a manner distributed around the circumference of the valve pipe. The reed valve can in this case be configured such that it directly covers the openings. However, it is also possible for the reed valve to not or at least not fully cover the openings. The sealing action of the reed valve can be achieved in this case in that, in its closed position, it bears sealingly against the inner wall and in this way separates the air chamber from the mixing chamber.
According to one embodiment according to the invention, the duckbill valve and the reed valve are in the form of a combination valve with a structurally integral and one-piece main body. In this way, a particularly simple structure with low assembly complexity can be realized.
The combination valve can in this case be inserted with its main body in the valve pipe.
The main body of the combination valve is preferably embodied such that it has a base portion and a shielding portion, wherein the shielding portion is integrally formed on the outer circumference of the base portion and Date Recue/Date Received 2022-04-22
- 6 -circumferentially projects beyond the latter. For example, the reed valve can be formed by the shielding portion, while the duckbill valve is formed in the region of the base portion.
Specifically, in the wall of the valve pipe, at the level of the internally bearing shielding portion, there may be one or more openings, which, in the closed position of the reed valve, are covered by the shielding portion and/or the fluidic connection of which to the mixing chamber is closed by the shielding portion. If the pump bellows is compressed by actuation of the foam pump, the pressure in the air chamber of the pump bellows increases to above the pressure in the mixing chamber. When a predefined pressure difference is exceeded, the shielding portion lifts at least briefly off the inner wall such that air passes through the opening from the air chamber into the mixing chamber formed for example within the valve pipe. If the pressure difference is fallen below again, the shielding portion deforms back and bears against the inner wall again, i.e. the reed valve is closed again. Consequently, a backflow of air from the mixing chamber back into the air chamber of the pump bellows is prevented with the reed valve formed in this way. The reed valve can also be referred to as a lamellar valve.
The combination valve is preferably embodied such that in the non-installed state, the shielding portion is formed in a collar-like or funnel-like manner and covers or encloses the base portion - at least in the non-installed state. The base portion is in this case enclosed preferably approximately in an umbrella-like manner and possibly with an appropriate spacing between the shielding portion and the base portion. In particular, the shielding portion can form a downwardly inclined collar in the direction of the free end of the base portion. In this way, it is possible that - when the Date Recue/Date Received 2022-04-22
Specifically, in the wall of the valve pipe, at the level of the internally bearing shielding portion, there may be one or more openings, which, in the closed position of the reed valve, are covered by the shielding portion and/or the fluidic connection of which to the mixing chamber is closed by the shielding portion. If the pump bellows is compressed by actuation of the foam pump, the pressure in the air chamber of the pump bellows increases to above the pressure in the mixing chamber. When a predefined pressure difference is exceeded, the shielding portion lifts at least briefly off the inner wall such that air passes through the opening from the air chamber into the mixing chamber formed for example within the valve pipe. If the pressure difference is fallen below again, the shielding portion deforms back and bears against the inner wall again, i.e. the reed valve is closed again. Consequently, a backflow of air from the mixing chamber back into the air chamber of the pump bellows is prevented with the reed valve formed in this way. The reed valve can also be referred to as a lamellar valve.
The combination valve is preferably embodied such that in the non-installed state, the shielding portion is formed in a collar-like or funnel-like manner and covers or encloses the base portion - at least in the non-installed state. The base portion is in this case enclosed preferably approximately in an umbrella-like manner and possibly with an appropriate spacing between the shielding portion and the base portion. In particular, the shielding portion can form a downwardly inclined collar in the direction of the free end of the base portion. In this way, it is possible that - when the Date Recue/Date Received 2022-04-22
- 7 -combination valve is installed - the shielding portion is elongated upwardly to a certain extent away from the base portion such that the shielding portion is everted through a predefined angle along a central axis from the non-installed state into the installed state. As a result, it is possible for the shielding portion to bear against the inner wall of the valve pipe with a predefined pretension. This pretension defines to a certain extent the pressure difference that has to be exceeded in order to transfer the reed valve into its open position. For example, the combination valve can be configured such that, when it is installed, the shielding portion is everted through an angle of more than 200 and in particular of more than 90 along the central axis. This results in particularly secure bearing of the shielding portion against the inner side of the valve pipe, such that a particularly good valve action of the shielding portion with respect to the opening in the wall of the valve pipe occurs. It is also sufficient, however, for the shielding portion to be everted through a smaller angle in order to achieve a good valve action.
In the region of the base portion of the combination valve, a fluid duct can be provided, which extends in particular along the central axis and into which the duckbill valve of the combination valve leads. Through this fluid duct, in the open position of the duckbill valve, the liquid can flow out of the pump chamber into the mixing chamber.
Further advantageously, the combination valve or at least its main body is made of a plastic, for example silicone.
In particular, the combination valve can thus be produced easily and cost-effectively, wherein, at the same time, a good valve action is achieved. Moreover, in particular silicone is characterized by having high media resistance.
Date Recue/Date Received 2022-04-22
In the region of the base portion of the combination valve, a fluid duct can be provided, which extends in particular along the central axis and into which the duckbill valve of the combination valve leads. Through this fluid duct, in the open position of the duckbill valve, the liquid can flow out of the pump chamber into the mixing chamber.
Further advantageously, the combination valve or at least its main body is made of a plastic, for example silicone.
In particular, the combination valve can thus be produced easily and cost-effectively, wherein, at the same time, a good valve action is achieved. Moreover, in particular silicone is characterized by having high media resistance.
Date Recue/Date Received 2022-04-22
- 8 -As already mentioned, the mixing chamber can be formed directly in the valve pipe. Alternatively or additionally, the pump chamber can be formed in the valve pipe.
In a further configuration, the valve support can have a piston portion which extends into the valve pipe such that the piston portion changes the volume in the pump chamber during a stroke movement of the valve pipe. The piston portion can be embodied individually or the piston portion forms a portion of the valve support, which can be formed in particular in one piece and materially integrally with the valve support. Specifically, the piston portion can be embodied in a cylindrical manner and bear sealingly with its outer circumferential surface against the inner side of the valve pipe. In order to guide a stroke movement of the valve pipe relative to the valve support, the valve pipe can be guided liquid-tightly with a terminal portion on the outer circumferential surface of the piston portion, wherein the liquid can fulfill a lubricating action between the outer circumferential surface of the piston portion and the inner side of the valve pipe.
Particularly advantageously, the inlet valve is arranged on the valve support and in particular likewise in the piston portion. For example, the inlet valve is arranged with its top in the piston portion and has a valve disk which covers an overflow opening in the piston portion.
If, following actuation of the foam pump, the valve pipe is returned into its starting position relative to the valve support, the volume of the pump chamber is increased, with the result that liquid is drawn into the pump chamber via the inlet valve. For this purpose, for example the valve disk lifts off the overflow opening, with the result that liquid can then flow from the container into the pump chamber. The return of the valve pipe into its starting position relative to the valve Date Recue/Date Received 2022-04-22
In a further configuration, the valve support can have a piston portion which extends into the valve pipe such that the piston portion changes the volume in the pump chamber during a stroke movement of the valve pipe. The piston portion can be embodied individually or the piston portion forms a portion of the valve support, which can be formed in particular in one piece and materially integrally with the valve support. Specifically, the piston portion can be embodied in a cylindrical manner and bear sealingly with its outer circumferential surface against the inner side of the valve pipe. In order to guide a stroke movement of the valve pipe relative to the valve support, the valve pipe can be guided liquid-tightly with a terminal portion on the outer circumferential surface of the piston portion, wherein the liquid can fulfill a lubricating action between the outer circumferential surface of the piston portion and the inner side of the valve pipe.
Particularly advantageously, the inlet valve is arranged on the valve support and in particular likewise in the piston portion. For example, the inlet valve is arranged with its top in the piston portion and has a valve disk which covers an overflow opening in the piston portion.
If, following actuation of the foam pump, the valve pipe is returned into its starting position relative to the valve support, the volume of the pump chamber is increased, with the result that liquid is drawn into the pump chamber via the inlet valve. For this purpose, for example the valve disk lifts off the overflow opening, with the result that liquid can then flow from the container into the pump chamber. The return of the valve pipe into its starting position relative to the valve Date Recue/Date Received 2022-04-22
- 9 -support can take place by way of the elastic action of the pump bellows and/or by way of external spring means, which may be present for example in a receiving device of the foam pump.
The combination valve is preferably received in the valve pipe itself and it can be entrained with the stroke movement of the valve pipe. To receive the combination valve in the valve pipe, the valve pipe can have an inwardly facing receiving collar on which the combination valve is received and as a result of which, within the valve pipe, it separates the pump chamber from the mixing chamber. In particular, simple assembly and at the same time a compact structure of the foam pump can be achieved in this way.
Further advantageously, the pump bellows has a connecting piece which externally encloses a portion of the valve pipe, wherein, in this region, at least one air inlet duct is formed, through which air is able to flow into the air chamber of the pump bellows.
The foam pump can be actuated by means of an actuation unit. This can have an actuation disk which can be directly manually actuated or indirectly actuated by manual activation of a further external component in a receiving device for the container with the foam pump, with the result that a respective pump cycle is initiated. The actuation unit can have a portion formed in a sleeve-like manner, with which a movement of the actuation unit is guided along the valve pipe and/or the connecting piece of the pump bellows. For example, the portion formed in a sleeve-like manner can be plugged into the valve pipe such that the actuation unit can be moved a predetermined distance relative to the valve pipe. The air/liquid mixture can in this case pass through a fluid duct in the actuation unit from the mixing chamber to a dispensing end.
Date Recue/Date Received 2022-04-22
The combination valve is preferably received in the valve pipe itself and it can be entrained with the stroke movement of the valve pipe. To receive the combination valve in the valve pipe, the valve pipe can have an inwardly facing receiving collar on which the combination valve is received and as a result of which, within the valve pipe, it separates the pump chamber from the mixing chamber. In particular, simple assembly and at the same time a compact structure of the foam pump can be achieved in this way.
Further advantageously, the pump bellows has a connecting piece which externally encloses a portion of the valve pipe, wherein, in this region, at least one air inlet duct is formed, through which air is able to flow into the air chamber of the pump bellows.
The foam pump can be actuated by means of an actuation unit. This can have an actuation disk which can be directly manually actuated or indirectly actuated by manual activation of a further external component in a receiving device for the container with the foam pump, with the result that a respective pump cycle is initiated. The actuation unit can have a portion formed in a sleeve-like manner, with which a movement of the actuation unit is guided along the valve pipe and/or the connecting piece of the pump bellows. For example, the portion formed in a sleeve-like manner can be plugged into the valve pipe such that the actuation unit can be moved a predetermined distance relative to the valve pipe. The air/liquid mixture can in this case pass through a fluid duct in the actuation unit from the mixing chamber to a dispensing end.
Date Recue/Date Received 2022-04-22
- 10 -In order to initiate the pump cycle, the actuation unit is coupled to the pump bellows such that the pump bellows is compressed upon actuation of the actuation unit. If the pump bellows relaxes again and if it is returned into its starting position again (by elastic restoring forces or spring forces from external spring means), the actuation unit is also returned into its unactuated position. Specifically, the actuation unit can, for the purpose, be anchored on the connecting piece of the pump bellows, wherein the actuation unit pushes the pump bellows into its compressed position by means of a shoulder which can be formed for example by the actuation disk. In the process, a part of the distance that is covered can serve to close an air inlet opening which is formed between the connecting piece and the shoulder or actuation disk and through which air can flow from the outside into the air chamber of the pump bellows.
In order to achieve a good foam quality, the mixing chamber can be adjoined by at least one foam generator which has at least two, three, four or more than four foam screens. For example, the foam generator can be arranged with the plurality of foam screens in a dispensing end, adjoining the mixing chamber, of the valve pipe or in the region of the actuation unit. If the liquid is premixed with the air in the mixing chamber and pushed through the foam screens, for example micrometer-mesh screens, the screens create, in particular in their mutually spaced-apart arrangement one after another, a very dimensionally stable foam, which is facilitated by the plurality of successively arranged foam screens with intermediate spaces formed in between. This results in a particularly dimensionally stable foam, in particular regardless of the type of liquid which is introduced into the foam pump.
PREFERRED EXEMPLARY EMBODIMENTS OF THE INVENTION
Date Recue/Date Received 2022-04-22
In order to achieve a good foam quality, the mixing chamber can be adjoined by at least one foam generator which has at least two, three, four or more than four foam screens. For example, the foam generator can be arranged with the plurality of foam screens in a dispensing end, adjoining the mixing chamber, of the valve pipe or in the region of the actuation unit. If the liquid is premixed with the air in the mixing chamber and pushed through the foam screens, for example micrometer-mesh screens, the screens create, in particular in their mutually spaced-apart arrangement one after another, a very dimensionally stable foam, which is facilitated by the plurality of successively arranged foam screens with intermediate spaces formed in between. This results in a particularly dimensionally stable foam, in particular regardless of the type of liquid which is introduced into the foam pump.
PREFERRED EXEMPLARY EMBODIMENTS OF THE INVENTION
Date Recue/Date Received 2022-04-22
- 11 -Further measures which improve the invention are illustrated in more detail in the following text in conjunction with the description of preferred exemplary embodiments of the invention with reference to the figures, in which:
Figure 1 shows an embodiment of a foam pump according to the invention in a cross-sectional view, Figure 2 shows an embodiment of a combination valve according to the invention in the non-installed state, Figure 3 shows the combination valve according to figure 2 in the installed state, Figure 4 shows an embodiment of a foam pump according to the invention in a cross-sectional view, Figure 5 shows an embodiment of a combination valve according to the invention in the non-installed state, Figure 6 shows the combination valve according to figure 5 in the installed state.
Figure 1 shows a cross-sectional view of an exemplary embodiment of a foam pump 1 according to the invention.
The foam pump 1 has a valve support 10. The valve support may have been produced for example as an injection-molded plastics component. The valve support 10 is configured such that it can be arranged on a container (not illustrated in figure 1) in which a liquid such as a foam soap or a foamable disinfectant solution is located.
In the exemplary embodiment illustrated in figure 1, the valve support 10 and thus also the foam pump 1 are Date Recue/Date Received 2022-04-22
Figure 1 shows an embodiment of a foam pump according to the invention in a cross-sectional view, Figure 2 shows an embodiment of a combination valve according to the invention in the non-installed state, Figure 3 shows the combination valve according to figure 2 in the installed state, Figure 4 shows an embodiment of a foam pump according to the invention in a cross-sectional view, Figure 5 shows an embodiment of a combination valve according to the invention in the non-installed state, Figure 6 shows the combination valve according to figure 5 in the installed state.
Figure 1 shows a cross-sectional view of an exemplary embodiment of a foam pump 1 according to the invention.
The foam pump 1 has a valve support 10. The valve support may have been produced for example as an injection-molded plastics component. The valve support 10 is configured such that it can be arranged on a container (not illustrated in figure 1) in which a liquid such as a foam soap or a foamable disinfectant solution is located.
In the exemplary embodiment illustrated in figure 1, the valve support 10 and thus also the foam pump 1 are Date Recue/Date Received 2022-04-22
- 12 -configured such that the connection to the container is effected by means of a screw connection. To this end, the valve support 10 has an internal thread 38, via which the foam pump 1 can be screwed for example onto a dispensing nozzle of the container. In the region enclosed by the internal thread 38 there are feed lines to a valve system, to which the soap or the solution can flow. The internal thread of the valve support 10 can in this case end tightly with a mating thread formed on the container. In the exemplary embodiment shown in figure 1, the sealing action is achieved, however, by a sealing cone 43 which is formed on the valve support 10 and can bear sealingly against a neck of the container.
Around its central axis 25, the valve support 10 has a piston portion 27, which forms a rigid portion of the valve support 10 within the internal thread 38. The piston portion 27 has a planar end face with an overflow opening 36, through which liquid can pass out of the container into an adjoining pump chamber 14. Fastened to the end face is an inlet valve 11, which has a valve disk 35 which covers the overflow opening 36 in a rest state.
The pump chamber 14 is formed by a valve pipe 12. The valve pipe 12 has been pushed onto a cylindrical outer circumferential surface of the piston portion 27 and guided axially movably on the piston portion 27 along the central axis 25. If the valve pipe 12 is moved axially up and down in the direction of the central axis 25, an end portion of the valve pipe 12 moves to different extents over the piston portion 27, resulting in a change in the volume of the pump chamber 13. If, as a result of an actuation of the foam pump 1, the valve pipe 12 is pushed further onto the piston portion 27, the volume of the pump chamber 13 is reduced. During a return movement of the valve pipe 12 relative to the valve support 10, the piston portion 27 travels back out of the valve pipe 12 and the volume of the pump chamber 13 increases. An Date Recue/Date Received 2022-04-22
Around its central axis 25, the valve support 10 has a piston portion 27, which forms a rigid portion of the valve support 10 within the internal thread 38. The piston portion 27 has a planar end face with an overflow opening 36, through which liquid can pass out of the container into an adjoining pump chamber 14. Fastened to the end face is an inlet valve 11, which has a valve disk 35 which covers the overflow opening 36 in a rest state.
The pump chamber 14 is formed by a valve pipe 12. The valve pipe 12 has been pushed onto a cylindrical outer circumferential surface of the piston portion 27 and guided axially movably on the piston portion 27 along the central axis 25. If the valve pipe 12 is moved axially up and down in the direction of the central axis 25, an end portion of the valve pipe 12 moves to different extents over the piston portion 27, resulting in a change in the volume of the pump chamber 13. If, as a result of an actuation of the foam pump 1, the valve pipe 12 is pushed further onto the piston portion 27, the volume of the pump chamber 13 is reduced. During a return movement of the valve pipe 12 relative to the valve support 10, the piston portion 27 travels back out of the valve pipe 12 and the volume of the pump chamber 13 increases. An Date Recue/Date Received 2022-04-22
- 13 -increase in the volume of the pump chamber 13 brings about a negative pressure in the pump chamber 13 compared with the container, with the result that the inlet valve 11 is transferred into its open position and liquid can flow through the overflow opening 36 from the container into the pump chamber 13.
Following the pump chamber 13 there is a mixing chamber 16, which is separated from the pump chamber 13 by a combination valve 17 inserted into the valve pipe 12. The combination valve 17 is fixedly received within the valve pipe 12 via a receiving collar 28. The combination valve 17 has a main body 18 with a base portion 19 and a shielding portion 20 adjoining the latter. A fluid duct 26 extends centrally through the base portion 19, said fluid duct 26 leading into a duckbill valve 21. The shielding portion 20 of the combination valve bears, in the installed state, against an inner wall of the valve pipe 12 and covers openings 22 which are provided in this region in the wall 23 of the valve pipe 12.
If the valve pipe 12 is moved in the direction of the piston portion 27 by actuation of the foam pump 1, the volume of the pump chamber 13 is reduced. The positive pressure that is established in the pump chamber 13 ensures that the inlet valve 11 is securely closed and thus no liquid can flow out of the container into the pump chamber 13. Moreover, as a result of the positive pressure that is established in the pump chamber 13, the duckbill valve 21 is transferred into its open position such that liquid can flow into the mixing chamber 16 through the fluid duct 26 and the duckbill valve 21.
Furthermore, the foam pump 1 has a pump bellows 15. The pump bellows 15 has on its one end face a receiving collar for connecting to the valve support 10. On its other end face, it has a connecting piece 33, by means of which the pump bellows 15 is connected to the valve pipe 12. In Date Recue/Date Received 2022-04-22
Following the pump chamber 13 there is a mixing chamber 16, which is separated from the pump chamber 13 by a combination valve 17 inserted into the valve pipe 12. The combination valve 17 is fixedly received within the valve pipe 12 via a receiving collar 28. The combination valve 17 has a main body 18 with a base portion 19 and a shielding portion 20 adjoining the latter. A fluid duct 26 extends centrally through the base portion 19, said fluid duct 26 leading into a duckbill valve 21. The shielding portion 20 of the combination valve bears, in the installed state, against an inner wall of the valve pipe 12 and covers openings 22 which are provided in this region in the wall 23 of the valve pipe 12.
If the valve pipe 12 is moved in the direction of the piston portion 27 by actuation of the foam pump 1, the volume of the pump chamber 13 is reduced. The positive pressure that is established in the pump chamber 13 ensures that the inlet valve 11 is securely closed and thus no liquid can flow out of the container into the pump chamber 13. Moreover, as a result of the positive pressure that is established in the pump chamber 13, the duckbill valve 21 is transferred into its open position such that liquid can flow into the mixing chamber 16 through the fluid duct 26 and the duckbill valve 21.
Furthermore, the foam pump 1 has a pump bellows 15. The pump bellows 15 has on its one end face a receiving collar for connecting to the valve support 10. On its other end face, it has a connecting piece 33, by means of which the pump bellows 15 is connected to the valve pipe 12. In Date Recue/Date Received 2022-04-22
- 14 -between, the pump bellows 15 forms an air chamber 14.
This is delimited at its outer circumference by a plurality of cylindrical bellows portions with a diameter that becomes smaller in a stepped manner. At its inner circumference, it is delimited by the wall 23 of the valve pipe 12.
If the foam pump 1 is actuated and the valve pipe 12 is pushed onto the piston portion 27, the connecting piece 33 of the pump bellows 15 is entrained and displaced in the direction of the valve support 10. As a result, the volume of the air chamber 14 is reduced. Moreover, the elastic deformation of the pump bellows 15 brings about a restoring force, as a result of which the pump bellows
This is delimited at its outer circumference by a plurality of cylindrical bellows portions with a diameter that becomes smaller in a stepped manner. At its inner circumference, it is delimited by the wall 23 of the valve pipe 12.
If the foam pump 1 is actuated and the valve pipe 12 is pushed onto the piston portion 27, the connecting piece 33 of the pump bellows 15 is entrained and displaced in the direction of the valve support 10. As a result, the volume of the air chamber 14 is reduced. Moreover, the elastic deformation of the pump bellows 15 brings about a restoring force, as a result of which the pump bellows
15, following actuation, returns the valve pipe 12 into its starting position, in which the piston portion 27 again passes only to a smaller extent into the valve pipe 12. The elastic spring-back can be supported by external spring means that are not illustrated in figure 1.
The air chamber 14 of the pump bellows 15 is fluidically connected to the mixing chamber 16 formed in the valve pipe 12, specifically via the openings 22 in the wall 23 of the valve pipe 12, said openings 22 being provided in the region of the mixing chamber 26 and being covered by the shielding portion 20 of the combination valve. The shielding portion 20 in the process forms a reed valve, via which air can selectively flow from the air chamber 14 into the mixing chamber 16.
The manner of functioning is as follows: If the foam pump 1 is actuated, liquid - as already set out above - flows through the duckbill valve 21 into the mixing chamber 16.
At the same time, the pump bellows 15 is compressed, with the result that the volume of the air chamber 14 is reduced and accordingly the air pressure in the air chamber 14 increases. If the pressure in the air chamber 14 exceeds the pressure in the mixing chamber 16, the Date Recue/Date Received 2022-04-22 shielding portion 20 lifts regionally off the inner side of the wall 23 of the valve pipe 12 such that air can flow through the openings 22 into the mixing chamber 16.
In this way, air can be admixed with the liquid from the pump chamber 13, these being premixed and optionally also prefoamed in the mixing chamber 16.
The mixing chamber 16 is adjoined, as seen in the direction of the central axis 25, by a swirling unit 32 and two foam generators 30, which each have for example two foam screens 31. The two foam generators 30 are embodied as sleeve bodies and have the two-dimensional foam screens 31 on the face side such that, in the case of foam generators 30 that are arranged spaced apart from one another, a total of four foam screens 31 follow the mixing chamber 16 along the foam duct in order to create as fine a foam as possible from the liquid/air mixture.
The foam screens 31 form preferably micrometer screens, for example with a mesh size in the region of 100 pm.
It has been found here that the arrangement of four foam screens 31 with respective spacings between them can create a particularly high-quality foam, which is dimensionally stable. In particular, a high-quality foam can be created even with different types of liquids which are fed via the valve pipe 12.
The swirling unit 32 and the two foam generators 30 are each arranged in a sleeve-like portion of an actuation unit 41. Between the two sleeve-like portions, the actuation unit 41 has an actuation disk 37, via which the foam pump 1 can be actuated. To this end, the foam pump 1 can be inserted for example into an appropriate device, wherein, as a result of manual activation of a further external component in the receiving device, the actuation disk 37 can be moved up and down, thereby initiating a respective pump cycle.
Date Recue/Date Received 2022-04-22
The air chamber 14 of the pump bellows 15 is fluidically connected to the mixing chamber 16 formed in the valve pipe 12, specifically via the openings 22 in the wall 23 of the valve pipe 12, said openings 22 being provided in the region of the mixing chamber 26 and being covered by the shielding portion 20 of the combination valve. The shielding portion 20 in the process forms a reed valve, via which air can selectively flow from the air chamber 14 into the mixing chamber 16.
The manner of functioning is as follows: If the foam pump 1 is actuated, liquid - as already set out above - flows through the duckbill valve 21 into the mixing chamber 16.
At the same time, the pump bellows 15 is compressed, with the result that the volume of the air chamber 14 is reduced and accordingly the air pressure in the air chamber 14 increases. If the pressure in the air chamber 14 exceeds the pressure in the mixing chamber 16, the Date Recue/Date Received 2022-04-22 shielding portion 20 lifts regionally off the inner side of the wall 23 of the valve pipe 12 such that air can flow through the openings 22 into the mixing chamber 16.
In this way, air can be admixed with the liquid from the pump chamber 13, these being premixed and optionally also prefoamed in the mixing chamber 16.
The mixing chamber 16 is adjoined, as seen in the direction of the central axis 25, by a swirling unit 32 and two foam generators 30, which each have for example two foam screens 31. The two foam generators 30 are embodied as sleeve bodies and have the two-dimensional foam screens 31 on the face side such that, in the case of foam generators 30 that are arranged spaced apart from one another, a total of four foam screens 31 follow the mixing chamber 16 along the foam duct in order to create as fine a foam as possible from the liquid/air mixture.
The foam screens 31 form preferably micrometer screens, for example with a mesh size in the region of 100 pm.
It has been found here that the arrangement of four foam screens 31 with respective spacings between them can create a particularly high-quality foam, which is dimensionally stable. In particular, a high-quality foam can be created even with different types of liquids which are fed via the valve pipe 12.
The swirling unit 32 and the two foam generators 30 are each arranged in a sleeve-like portion of an actuation unit 41. Between the two sleeve-like portions, the actuation unit 41 has an actuation disk 37, via which the foam pump 1 can be actuated. To this end, the foam pump 1 can be inserted for example into an appropriate device, wherein, as a result of manual activation of a further external component in the receiving device, the actuation disk 37 can be moved up and down, thereby initiating a respective pump cycle.
Date Recue/Date Received 2022-04-22
- 16 -The one sleeve-like portion of the actuation unit 41, in which, in the exemplary embodiment shown in figure 1, the swirling unit 32 is arranged, extends through the connecting piece 33 of the pump bellows 15 and into the valve pipe 12. In this case, the actuation unit 41 is guided so as to be movable in the direction of the central axis 25 at least to a limited extent in the valve pipe 12. The degree of freedom of movement is limited by stops formed on the actuation unit 41 and on the connecting piece 33, respectively:
- In the actuating direction of the foam pump 1, the actuation unit 41 can be pushed into the valve pipe 12 until the actuation disk or a shoulder integrally formed thereon bears sealingly against the end face of the connecting piece 33. In particular, an air inlet duct 34 is then closed in an airtight manner in the region between the connecting piece 33 and the actuation unit 41 or the valve pipe 12.
- In the opposite direction, the degree of freedom of movement is limited in that the actuation unit 41 can be moved out of the valve pipe 12 only until a stop formed on the outer circumference of the actuation unit 41 bears against a mating stop formed on the inner circumference of the connecting piece 33. In this position, the air inlet duct 34 is open and so air can flow from a region beneath the actuation disk 37 into the air chamber 14 of the pump bellows 15.
In order to prevent foam from exiting the mixing chamber 16, in the sleeve-like portion of the actuation unit 41, with which the latter extends into the valve pipe 12, three sealing grooves are provided on the outer circumference of this portion in the exemplary embodiment shown in figure 1. The sealing action can, however, also Date Recue/Date Received 2022-04-22
- In the actuating direction of the foam pump 1, the actuation unit 41 can be pushed into the valve pipe 12 until the actuation disk or a shoulder integrally formed thereon bears sealingly against the end face of the connecting piece 33. In particular, an air inlet duct 34 is then closed in an airtight manner in the region between the connecting piece 33 and the actuation unit 41 or the valve pipe 12.
- In the opposite direction, the degree of freedom of movement is limited in that the actuation unit 41 can be moved out of the valve pipe 12 only until a stop formed on the outer circumference of the actuation unit 41 bears against a mating stop formed on the inner circumference of the connecting piece 33. In this position, the air inlet duct 34 is open and so air can flow from a region beneath the actuation disk 37 into the air chamber 14 of the pump bellows 15.
In order to prevent foam from exiting the mixing chamber 16, in the sleeve-like portion of the actuation unit 41, with which the latter extends into the valve pipe 12, three sealing grooves are provided on the outer circumference of this portion in the exemplary embodiment shown in figure 1. The sealing action can, however, also Date Recue/Date Received 2022-04-22
- 17 -be achieved with more or fewer sealing grooves or with separated sealing means such as an 0-ring or the like.
The foam generation will be explained once again in more detail in the following text:
Upon each pump movement, the volume in the pump chamber 13 decreases and then increases again as a result of the return movement of the valve pipe 12 on account of the elastic return of the pump bellows 15 or on account of the spring forces from external spring means.
If the volume in the pump chamber 13 increases, as a result of the negative pressure prevailing therein, the inlet valve 11 is transferred into its open position. In other words, the valve disk 36 lifts off the overflow opening 36 and liquid can be drawn through the overflow opening 36 into the pump chamber 13. At the same time, the duckbill valve 21 closes the combination valve 17.
In other words, liquid or an air/liquid mixture is prevented from being sucked from the mixing chamber 16 into the pump chamber 13. Moreover, during the movement, the reed valve 24 closes on account of the negative pressure prevailing in the pump bellows 15, thereby preventing liquid or an air/liquid mixture from being sucked out of the mixing chamber 16 into the air chamber 14. On account of the negative pressure in the air chamber 14, however, air is then sucked through the air inlet duct 34, which is then open, from the region beneath the actuating disk 37 into the air chamber 14 of the pump bellows 15.
If the foam pump 1 is actuated again, the volume of the pump chamber 13 is reduced again and the liquid that has flowed into the pump chamber 13 can - on account of the positive pressure generated in the pump chamber 13 - flow through the duckbill valve 21, which is then open, into the mixing chamber 16. At the same time, the volume of Date Recue/Date Received 2022-04-22
The foam generation will be explained once again in more detail in the following text:
Upon each pump movement, the volume in the pump chamber 13 decreases and then increases again as a result of the return movement of the valve pipe 12 on account of the elastic return of the pump bellows 15 or on account of the spring forces from external spring means.
If the volume in the pump chamber 13 increases, as a result of the negative pressure prevailing therein, the inlet valve 11 is transferred into its open position. In other words, the valve disk 36 lifts off the overflow opening 36 and liquid can be drawn through the overflow opening 36 into the pump chamber 13. At the same time, the duckbill valve 21 closes the combination valve 17.
In other words, liquid or an air/liquid mixture is prevented from being sucked from the mixing chamber 16 into the pump chamber 13. Moreover, during the movement, the reed valve 24 closes on account of the negative pressure prevailing in the pump bellows 15, thereby preventing liquid or an air/liquid mixture from being sucked out of the mixing chamber 16 into the air chamber 14. On account of the negative pressure in the air chamber 14, however, air is then sucked through the air inlet duct 34, which is then open, from the region beneath the actuating disk 37 into the air chamber 14 of the pump bellows 15.
If the foam pump 1 is actuated again, the volume of the pump chamber 13 is reduced again and the liquid that has flowed into the pump chamber 13 can - on account of the positive pressure generated in the pump chamber 13 - flow through the duckbill valve 21, which is then open, into the mixing chamber 16. At the same time, the volume of Date Recue/Date Received 2022-04-22
- 18 -the air chamber 14 is reduced and air can - as a result of the positive pressure prevailing therein and on account of the air inlet duct 34, which is then closed -flow through the reed valve 24, which is then open, into the mixing chamber 16 via the openings 22 in the valve pipe 12.
If, on account of its inherent elasticity or on account of the spring forces from external spring means, the pump bellows 15 springs open again, the pump chamber 13 is filled with liquid from the container, as already described above. Moreover, air can flow from outside into the air chamber 14 through the air inlet duct 34.
Following execution and ending of the actuation of the foam pump 1, it is possible, with the starting position that is then reached, for a next stroke to be carried out in order again to transfer a quantity of liquid from the pump chamber 13 into the mixing chamber 16 and at the same time to admix air from the air chamber 14 of the pump bellows 15 via the openings 22. Consequently, the foam pump 1 can be operated with a large number of cycles that are able to be carried out in succession, in particular until ultimately a container, which is connected to the foam pump 1 via the internal thread 38, has been emptied. After being emptied, this container can be exchanged for a new container.
As shown in figure 1, the actuation disk 37 can be covered by a closure cover 39, which can be removed before the foam pump 1 is put into operation, in order to release the actuation disk 37. In this case, measures for rendering tamper-evident can be provided in order to make it visible when the foam pump 1 has already been opened.
In the exemplary embodiment shown in figure 1, for this purposes protrusions 44 are provided on the outer circumference in the region of the valve support 10, said protrusions breaking off and/or being damaged when the Date Recue/Date Received 2022-04-22
If, on account of its inherent elasticity or on account of the spring forces from external spring means, the pump bellows 15 springs open again, the pump chamber 13 is filled with liquid from the container, as already described above. Moreover, air can flow from outside into the air chamber 14 through the air inlet duct 34.
Following execution and ending of the actuation of the foam pump 1, it is possible, with the starting position that is then reached, for a next stroke to be carried out in order again to transfer a quantity of liquid from the pump chamber 13 into the mixing chamber 16 and at the same time to admix air from the air chamber 14 of the pump bellows 15 via the openings 22. Consequently, the foam pump 1 can be operated with a large number of cycles that are able to be carried out in succession, in particular until ultimately a container, which is connected to the foam pump 1 via the internal thread 38, has been emptied. After being emptied, this container can be exchanged for a new container.
As shown in figure 1, the actuation disk 37 can be covered by a closure cover 39, which can be removed before the foam pump 1 is put into operation, in order to release the actuation disk 37. In this case, measures for rendering tamper-evident can be provided in order to make it visible when the foam pump 1 has already been opened.
In the exemplary embodiment shown in figure 1, for this purposes protrusions 44 are provided on the outer circumference in the region of the valve support 10, said protrusions breaking off and/or being damaged when the Date Recue/Date Received 2022-04-22
- 19 -closure cover 39 is removed from the foam pump 1 for the first time.
In the following text, with reference to figures 2 and 3, particularities of the combination valve 17 are set out, which forms a central component of the foam pump 1 shown in figure 1. In particular, the combination valve 17 serves both for feeding liquid via the duckbill valve 21 and for feeding air via the opening 22, and the combination valve 17 is designed as an integrated component with several functions.
Figure 2 shows the combination valve 17 in a state in which it is not installed. The shielding portion 20 has already been preshaped during the production of the combination valve 17 such that it is not flat and disk-like but has been formed in a funnel-like and thus umbrella-like manner and at least partially encloses the outside of the base portion 19 of the main body 18 of the combination valve 17. The shielding portion 20 has in this case a circumferential inclination angle a, which brings about preshaping of the shielding portion 20, which is formed counter to the subsequent installation extension direction of the shielding portion 20. If the combination valve 17 is inserted into the valve pipe 12, the shielding portion 20 is everted. In particular, it is possible to provide that the shielding portion 20 is everted through an angle of more than 90 , for example 90 + a, as is shown in figure 3. In this state, the shielding portion 20 has been elongated approximately cylindrically in the direction of the duckbill valve 21, and a receiving slot 29 is freed up beneath the shielding portion 20, via which receiving slot 29 the combination valve 17 can be fastened to the receiving collar 28 within the valve pipe 12; see figure 1.
Figure 3 shows the combination valve 17 with the base portion 19 and with the shielding portion 20 in a state Date Recue/Date Received 2022-04-22
In the following text, with reference to figures 2 and 3, particularities of the combination valve 17 are set out, which forms a central component of the foam pump 1 shown in figure 1. In particular, the combination valve 17 serves both for feeding liquid via the duckbill valve 21 and for feeding air via the opening 22, and the combination valve 17 is designed as an integrated component with several functions.
Figure 2 shows the combination valve 17 in a state in which it is not installed. The shielding portion 20 has already been preshaped during the production of the combination valve 17 such that it is not flat and disk-like but has been formed in a funnel-like and thus umbrella-like manner and at least partially encloses the outside of the base portion 19 of the main body 18 of the combination valve 17. The shielding portion 20 has in this case a circumferential inclination angle a, which brings about preshaping of the shielding portion 20, which is formed counter to the subsequent installation extension direction of the shielding portion 20. If the combination valve 17 is inserted into the valve pipe 12, the shielding portion 20 is everted. In particular, it is possible to provide that the shielding portion 20 is everted through an angle of more than 90 , for example 90 + a, as is shown in figure 3. In this state, the shielding portion 20 has been elongated approximately cylindrically in the direction of the duckbill valve 21, and a receiving slot 29 is freed up beneath the shielding portion 20, via which receiving slot 29 the combination valve 17 can be fastened to the receiving collar 28 within the valve pipe 12; see figure 1.
Figure 3 shows the combination valve 17 with the base portion 19 and with the shielding portion 20 in a state Date Recue/Date Received 2022-04-22
- 20 -that it approximately takes up when the combination valve 17 has been installed and bears against the inside of the wall of the valve pipe 12, as illustrated in figure 1.
In this case, the shielding portion 20 is everted such that it extends approximately in the manner of a sleeve or of a pipe portion about the central axis 25 in the direction of the opening side of the duckbill valve 21.
The inclination, introduced into the main body 18, of the shielding portion 20 with the shown inclination angle a results in good bearing of the shielding portion 20 on the wall of the valve pipe, this having a positive effect on a valve action against the opening in the wall of the valve pipe. On its side facing away from the duckbill valve 21, the base portion 19 has on its outer circumference a mounting cone 40 in order to introduce the main body 18 of the combination valve 17 into the opening of the receiving collar in the valve pipe, as shown in figure 1. In this way, the combination valve 17 can be inserted particularly easily into the valve pipe during the assembly of the foam pump 1.
In contrast to the illustration provided in figures 1 and 3, the duckbill valve and the reed valve do not necessarily have to be formed as an integrally formed combination valve. Rather, they can also be in the form of two separately formed components which are each received in the valve pipe.
Furthermore, the use of a swirling unit is not absolutely necessary. Rather, foam generators can directly adjoin the mixing chamber. Said foam generates can, as shown in figure 1, be arranged in a dispensing-side portion of the actuation unit 41. However, they can be arranged in a different distribution in the actuation unit 41, for example both in a portion, opposite to the dispensing end, above the actuation disk 37. Furthermore, other functional units can be arranged in the actuation unit 41. For example, an insert or a formation in the form of Date Recue/Date Received 2022-04-22
In this case, the shielding portion 20 is everted such that it extends approximately in the manner of a sleeve or of a pipe portion about the central axis 25 in the direction of the opening side of the duckbill valve 21.
The inclination, introduced into the main body 18, of the shielding portion 20 with the shown inclination angle a results in good bearing of the shielding portion 20 on the wall of the valve pipe, this having a positive effect on a valve action against the opening in the wall of the valve pipe. On its side facing away from the duckbill valve 21, the base portion 19 has on its outer circumference a mounting cone 40 in order to introduce the main body 18 of the combination valve 17 into the opening of the receiving collar in the valve pipe, as shown in figure 1. In this way, the combination valve 17 can be inserted particularly easily into the valve pipe during the assembly of the foam pump 1.
In contrast to the illustration provided in figures 1 and 3, the duckbill valve and the reed valve do not necessarily have to be formed as an integrally formed combination valve. Rather, they can also be in the form of two separately formed components which are each received in the valve pipe.
Furthermore, the use of a swirling unit is not absolutely necessary. Rather, foam generators can directly adjoin the mixing chamber. Said foam generates can, as shown in figure 1, be arranged in a dispensing-side portion of the actuation unit 41. However, they can be arranged in a different distribution in the actuation unit 41, for example both in a portion, opposite to the dispensing end, above the actuation disk 37. Furthermore, other functional units can be arranged in the actuation unit 41. For example, an insert or a formation in the form of Date Recue/Date Received 2022-04-22
- 21 -a constriction can be provided in the region of the dispensing end, with the result that, for example, a better outline of the dispensed foam can be achieved.
Figure 4 shows a further embodiment of the foam pump 1 according to the invention in a cross-sectional view. The structure of the foam pump 1 is similar to that of the foam pump shown in figure 1. However, there are differences in particular in the region of the combination valve 17 and of the actuation unit 41.
A swirling unit is not provided in the region of the actuation unit 41 in the exemplary embodiment shown in figure 4. Rather, two foam generators 30 immediately adjoin the mixing chamber 16. Following the foam generators 30 there is arranged a dispensing portion 42 with a duct that initially narrows conically and then widens conically again. This geometry can contributed to a targeted outline of the dispensed foam strand.
The combination valve 17, which is illustrated once again on its own in figures 5 and 6, differs from the embodiment according to figures 1 to 3 substantially in that the shielding portion 20 is kept slightly shorted and is everted less in the installed state, wherein, even with this less pronounced eversion, a good valve action of the reed valve 24 formed with the shielding portion 20 can be achieved. As shown in figure 4, the shielding portion 20 does not directly cover the openings 22 in the wall 23 of the valve pipe 12. In other words, the shielding portion 20 does not bear flat against the wall 23 around the openings 22. Rather, the shielding portion 20 bears sealingly against the wall 23 of the valve pipe 12 in a region spaced apart from the openings 22. This is likewise sufficient for it to be possible to selectively establish or close the fluidic connection between the air chamber 14 and the mixing chamber 16.
Date Recue/Date Received 2022-04-22
Figure 4 shows a further embodiment of the foam pump 1 according to the invention in a cross-sectional view. The structure of the foam pump 1 is similar to that of the foam pump shown in figure 1. However, there are differences in particular in the region of the combination valve 17 and of the actuation unit 41.
A swirling unit is not provided in the region of the actuation unit 41 in the exemplary embodiment shown in figure 4. Rather, two foam generators 30 immediately adjoin the mixing chamber 16. Following the foam generators 30 there is arranged a dispensing portion 42 with a duct that initially narrows conically and then widens conically again. This geometry can contributed to a targeted outline of the dispensed foam strand.
The combination valve 17, which is illustrated once again on its own in figures 5 and 6, differs from the embodiment according to figures 1 to 3 substantially in that the shielding portion 20 is kept slightly shorted and is everted less in the installed state, wherein, even with this less pronounced eversion, a good valve action of the reed valve 24 formed with the shielding portion 20 can be achieved. As shown in figure 4, the shielding portion 20 does not directly cover the openings 22 in the wall 23 of the valve pipe 12. In other words, the shielding portion 20 does not bear flat against the wall 23 around the openings 22. Rather, the shielding portion 20 bears sealingly against the wall 23 of the valve pipe 12 in a region spaced apart from the openings 22. This is likewise sufficient for it to be possible to selectively establish or close the fluidic connection between the air chamber 14 and the mixing chamber 16.
Date Recue/Date Received 2022-04-22
- 22 -The invention is not limited in its construction to the preferred exemplary embodiment set out above. Rather, a number of variants are conceivable, which make use of the illustrated solution even with constructions of fundamentally different types. All of the features and/or advantages that become apparent from the claims, the description or the drawings, including design details or spatial arrangements, can be essential to the invention both on their own and in a wide variety of combinations.
Date Recue/Date Received 2022-04-22
Date Recue/Date Received 2022-04-22
- 23 -List of reference signs 1 Foam pump Valve support 11 Inlet valve 12 Valve pipe 13 Pump chamber 14 Air chamber Pump bellows 16 Mixing chamber 17 Combination valve 18 Main body 19 Base portion Shielding portion 21 Duckbill valve 22 Opening 23 Wall
24 Reed valve Central axis 26 Fluid duct 27 Piston portion 28 Receiving collar 29 Receiving slot Foam generator 31 Foam screen 32 Swirling unit 33 Connecting piece 34 Air inlet duct Valve disk 36 Overflow opening 37 Actuation disk 38 Internal thread 39 Closure cover Mounting cone 41 Actuation unit 42 Dispensing portion 43 Sealing cone 44 Protrusion a Inclination angle Date Recue/Date Received 2022-04-22
Claims (15)
1. A foam pump (1) for arranging on a container filled with liquid, comprising - a valve support (10), - an inlet valve (11), - a valve pipe (12) which is arranged on or at least partially in the valve support (10) so as to be able to carry out a stroke movement, changing a volume in a pump chamber (13), with the result that liquid is able to flow from the container into the pump chamber (13) via the inlet valve (11), - a pump bellows (15) having an air chamber (14), and - a mixing chamber (16) which is fluidically connected to the pump chamber (13) and to the air chamber (14), characterized in that - a duckbill valve (21) is arranged between the pump chamber (13) and the mixing chamber (16), through which duckbill valve (21) liquid is able to flow from the pump chamber (13) into the mixing chamber (16) during a stroke movement of the valve pipe (12) relative to the valve support (10), and - a reed valve (24) is arranged between the air chamber (14) and the mixing chamber (16), through which reed valve (24) air is able to flow from the air chamber (14) in the pump bellows (15) into the mixing chamber (16) during a stroke movement of the valve pipe (12) relative to the valve support (10).
2. The foam pump (1) as claimed in claim 1, characterized in that the duckbill valve (21) and/or the reed valve (24) is/are received in the valve pipe (12).
3. The foam pump (1) as claimed in claim 1 or 2, characterized in that the reed valve (24), in order to bring about a valve action, is arranged from an interior against an opening (22) in a wall (23) of the valve pipe (12).
4. The foam pump (1) as claimed in one of claims 1 to 3, characterized in that the duckbill valve (21) and the reed valve (24) are in the form of a combination valve (17) with a structurally integral and one-piece main body (18).
5. The foam pump (1) as claimed in claim 4, characterized in that the combination valve (17) is inserted with its main body (18) in the valve pipe (12).
6. The foam pump (1) as claimed in claim 4 or 5, characterized in that the main body (18) has a base portion (19) and a shielding portion (20) and is configured such that the shielding portion (20) is integrally formed on the outer circumference of the base portion (19) and circumferentially projects beyond the latter.
7. The foam pump (1) as claimed in claim 6, characterized in that - in the non-installed state, the shielding portion (20) is formed in a collar-like or funnel-like manner and at least partially covers or encloses the base portion (19), and - in the installed state, the shielding portion (20) is everted through an angle of more than 20 and in particular more than 90 along a central axis and forms the reed valve (24) in operative connection with a/the wall (23) of the valve pipe (12).
8. The foam pump (1) as claimed in claim 6 or 7, characterized in that the base portion (19) has a fluid duct (26) which extends along the central axis and transitions into the duckbill valve (21).
9. The foam pump (1) as claimed in one of claims 4 to 8, characterized in that the main body (18) is made of a plastic, in particular silicone.
10. The foam pump (1) as claimed in one of the preceding claims, characterized in that the pump chamber (13) is formed in the valve pipe (12), and in that the valve support (10) has a piston portion (27) which extends into the valve pipe (12) such that the piston portion (27) changes the volume in the pump chamber (13) during a stroke movement of the valve pipe (12) relative to the valve support (10).
11. The foam pump (1) as claimed in claim 10, characterized in that the inlet valve (11) is arranged on the valve support (10) and/or in a/the piston portion (27).
12. The foam pump (1) as claimed in one of claims 4 to 11, characterized in that the valve pipe (11) has an inwardly facing receiving collar (28) on which the combination valve (17) is received, with the result that the combination valve (17), within the valve pipe (12), separates the pump chamber (13) from the mixing chamber (16).
13. The foam pump (1) as claimed in one of the preceding claims, characterized in that the pump bellows (15) has a connecting piece (33) which externally encloses a portion of the valve pipe (11), wherein, in this portion of the valve pipe (11), at least one air inlet duct (34) is formed, through which air is able to flow into the air chamber (14).
14. The foam pump (1) as claimed in one of the preceding claims, characterized in that an actuation unit (41) for actuating the foam pump (1) is provided, which is guided movably in the direction of the central axis (25) in the valve pipe (11) and/or the connecting piece (33) and which is in particular configured and arranged such that, upon actuation of the foam pump, the air inlet duct (34) is able to be closed.
15. The foam pump (1) as claimed in one of the preceding claims, characterized in that the mixing chamber (16) is adjoined by at least one foam generator (30) which has at least two, three, four or more than four foam screens (31).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19206040.8A EP3815792B1 (en) | 2019-10-29 | 2019-10-29 | Foam pump |
| EP19206040.8 | 2019-10-29 | ||
| PCT/EP2020/076419 WO2021083582A1 (en) | 2019-10-29 | 2020-09-22 | Foam pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3158567A1 true CA3158567A1 (en) | 2021-05-06 |
Family
ID=68392823
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3158567A Pending CA3158567A1 (en) | 2019-10-29 | 2020-09-22 | Foam pump |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3815792B1 (en) |
| CA (1) | CA3158567A1 (en) |
| WO (1) | WO2021083582A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ATE492348T1 (en) | 2008-05-28 | 2011-01-15 | Gojo Ind Inc | FOAM PUMP WITH ELASTIC PUMP CHAMBERS |
| EP3085456B1 (en) | 2015-04-21 | 2018-09-26 | Hübner GmbH & Co. KG | Foam pump |
-
2019
- 2019-10-29 EP EP19206040.8A patent/EP3815792B1/en active Active
-
2020
- 2020-09-22 CA CA3158567A patent/CA3158567A1/en active Pending
- 2020-09-22 WO PCT/EP2020/076419 patent/WO2021083582A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021083582A1 (en) | 2021-05-06 |
| EP3815792B1 (en) | 2022-03-30 |
| EP3815792A1 (en) | 2021-05-05 |
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