Roller pump for a milk module of a beverage preparation device, molded hose for media guidance in a roller pump and milk module for a beverage preparation device

Abstract

The invention relates to a roller pump (01) for a milk module for beverage preparation devices, comprising a housing (02) in which a hose guide (12) for a flexible fluid hose (07), preferably a milk hose, is formed, and a rotor (09) with rollers (14) or sliding shoes arranged thereon for sectionally radially inner contact with the fluid hose (07). According to the invention, the hose guide (12) has one, preferably several, particularly preferably two, relief widenings (13) shaped such that complementarily designed securing projections (14, 15) of the fluid hose (07) can engage in the relief widenings (13) and, when inserted, bring about tension and / or pressure relief of the fluid hose (07).

Description

[0001] The present invention relates to a roller pump for a milk module of a beverage preparation device according to the preamble of claim 1. Furthermore, the invention relates to a molded hose for media guidance in a roller pump, in particular a roller pump for a milk module of a beverage preparation device according to the preamble of claim 8. Furthermore, the invention relates to a milk module for beverage preparation devices with a roller pump and a molded hose inserted therein according to claim 11.

[0002] Various embodiments of milk modules for beverage preparation devices, in particular coffee and / or espresso machines, are known from the prior art.

[0003] On the one hand, there are approaches in which the conveyance of a volume flow of milk as well as the heating and / or frothing of the milk is achieved or provided with one and the same component of the milk module. These are usually milk modules whose milk pump essentially operates according to the Venturi principle or the principle of a jet pump, in which a heat transfer fluid, preferably steam and / or hot water with a corresponding overpressure is provided at an inlet side of a Venturi nozzle and the flowing heat transfer fluid creates a corresponding negative pressure at a second inlet of the nozzle, so that the milk or a volume flow of milk is sucked in and mixed with the heat transfer fluid at the outlet side of the nozzle, thereby achieving heating and / or frothing.

[0004] Alternatively, approaches already exist in the prior art in which the pumping or provision of the volume flow of the milk on the one hand and the heating and / or frothing of the milk on the other hand are provided by separate assemblies or components of the milk module. For example, DE 20 2016 006 814 U1 discloses an approach in which the volume flow of the milk is provided by a hose pump, roller pump, or peristaltic pump, and the heating of the milk is effected by means of a microwave radiator in a microwave chamber. The use of roller pumps, also referred to as peristaltic pumps, hose pumps, or hose squeeze pumps, for milk modules of beverage preparation devices, in particular coffee and / or espresso machines, is also known from other approaches.In this context, reference is made, for example, to DE 10 2007 024 443 A1, EP 1 472 963 B1, EP 2 215 942 A1, EP 2 570 060 B1 and EP 2 798 987 B1.

[0005] Roller pumps generally have the advantage that the fluid being pumped, especially the milk, does not come into contact with the pump itself; instead, only the fluid hose inside the roller pump comes into contact with the milk. This makes it easy to ensure food-safe and food-compatible handling of the milk. The pumping direction of these pumps can also be easily reversed, allowing the fluid hose or milk hose to be easily emptied, which promotes hygienic handling.

[0006] The disadvantage of using roller pumps or peristaltic pumps, however, is the constant and repeated stress on the fluid hose during operation due to the elastic deformation during compression and relaxation to generate the pumping effect.

[0007] In other applications for such pumps, such as medical technology, where the fluid hoses are predominantly disposable anyway, this has no adverse effects. In the present application of beverage preparation devices and their milk modules, however, the fluid hoses should be used as long as possible and therefore repeatedly, and should be cleaned, especially rinsed, after each use or at least at regular intervals.

[0008] Based on this prior art, it is therefore the object of the present invention to overcome the disadvantages in the prior art and in particular to propose a roller pump for milk modules of beverage preparation devices which increases the service life of the fluid hoses or reduces the wear of the fluid hoses and, moreover, to facilitate and improve the installation and removal both during operation with a fluid hose and when a fluid hose needs to be replaced.

[0009] This object is achieved with regard to a roller pump having the features of claim 1.

[0010] With regard to a molded hose as a flexible fluid hose for a roller pump, the problem is solved by the features of independent claim 8.

[0011] With regard to a milk module for a beverage preparation device, the object is achieved by the features of claim 11.

[0012] Advantageous embodiments are the subject of the following description, the description of the figures as well as the figures and the dependent claims.

[0013] In principle, features described below in terms of the device shall also be deemed to be correspondingly disclosed and claimable in terms of the method and vice versa.

[0014] The roller pump according to the invention for a milk module for beverage preparation devices, in particular coffee and / or espresso machines, comprises a housing in which a hose guide for a flexible fluid hose, preferably a milk hose, is formed, wherein a rotor with rollers or sliding shoes arranged thereon is also arranged in the housing, which rotor serves for section-wise, radially inner contact with the fluid hose and whose movement in cooperation with the hose guide in the direction of rotation leads to a narrowing, constriction and subsequent widening of the cross section of the fluid hose, so that a volume flow of the fluid to be conveyed, in particular the milk, is transported or pumped in the direction of rotation of the rotor.

[0015] According to the invention, it is provided that the hose guide has one, preferably several, particularly preferably two, relief widenings which are shaped such that complementarily designed securing projections of the fluid hose can engage in the relief widenings and, when inserted, bring about a tensile and / or pressure relief of the fluid hose.

[0016] The present invention is therefore based on the basic idea of ​​better absorbing the forces acting on the fluid hose, in particular tensile and compressive forces, during pump operation or during operation of the pump and dissipating them into the pump housing in order to reduce the overall load and stress on the fluid hose and thus increase its longevity or minimize wear.

[0017] In this context, the invention has recognized that it is particularly advantageous to introduce a large part of the forces acting on the fluid hose into the housing via the preferably form-fitting formation of relief widenings in the housing of the roller pump with complementarily formed projections or securing projections of the fluid hose and thus to relieve the fluid hose as a whole or at least to limit the forces occurring very locally, so that the wear-promoting mechanisms can only appear very locally or spatially limited.

[0018] The roller pump can be constructed according to a generally known principle. For example, the hose guide can have a known compensation to prevent or minimize pulsation of the pumped volume flow. The fluid hose, preferably the milk hose, can be made of generally known, food-safe or food-compliant plastic materials. The fluid hose is sufficiently flexible to allow both deformation due to the pressure of the rollers or sliding blocks and the basic assumption of the shape of the hose guide within the housing of the roller pump.

[0019] The relief expansions can be designed, for example, as a groove or grooves. The relief expansions are preferably designed symmetrically, for example, opposite one another and / or radially circumferentially, so that a uniform relief of pressure and tensile forces on the fluid hose is achieved. Particularly preferably, they extend perpendicular to the rotor's rotational axis.

[0020] According to a first advantageous embodiment of the roller pump, the relief expansions can be designed as additional expansions of the hose guide on the housing inlet and / or outlet sides. For example, it may be useful to provide expansions in the hose guide of the roller pump on the housing inlet and / or outlet sides in order to possibly provide coupling pieces to accommodate modified geometries of the fluid hose or milk hose for coupling purposes. However, these expansions are not suitable for absorbing and dissipating compressive and / or tensile forces, particularly when they interact with components formed separately from the fluid hose, such as connecting pieces or connectors connected via a plug-in connection.

[0021] Accordingly, it is particularly advantageous if, in addition to such widened portions, which essentially serve to facilitate or improve the connectivity of the roller pump and the fluid hose guided therein to other device components of the milk module and / or a beverage preparation device, the housing of the roller pump additionally has corresponding relief widened portions. These are then particularly preferably formed between the inlet-side and / or outlet-side widened portion of the hose guide and the part of the hose guide which is opposite the guide shoes or rollers during rotation of the rotor.The widened portions on the housing inlet and / or outlet sides can be used as connecting means and minimize the number of interfaces in the fluid system of the roller pump and are therefore also particularly advantageous, since a small number of interfaces also facilitates the assembly of the roller pump and its integration into other devices, such as a beverage preparation device.

[0022] In a further, particularly desirable embodiment of the roller pump, it can be provided that the relief widenings comprise or form a contour for receiving and / or forming a vortex chamber for foaming and / or heating the pumped fluid, preferably the milk.

[0023] As already explained in the introduction, when using a roller pump for a milk module of a beverage preparation device, an additional element or device component is generally required to heat the volume flow of milk generated by the roller pump. This can be achieved, for example, via a vortex chamber that is introduced into a heat transfer fluid, such as steam and / or hot water, and mixed with the volume flow of milk in the vortex chamber. Accordingly, it can be particularly advantageous for the vortex chamber to be integrated into the roller pump and the housing of the roller pump, with the relief expansions in the housing of the roller pump not only serving to relieve the fluid hose, but also simultaneously providing accommodation for such a vortex chamber or even the partial formation or delimitation of such a vortex chamber for frothing and / or heating the fluid.This allows, on the one hand, the heating and / or foaming to be integrated at least spatially into the roller pump and, at the same time, the relief of the fluid hose with regard to resulting pressure and / or tensile forces can be improved.

[0024] Furthermore, it can advantageously be provided that the hose guide and / or rotor is / are designed to interact with a tolerance compensation device so that production-related tolerances have no or only a reduced effect on the pump functionality and the pump characteristics and / or are constant within the scope of all production tolerances of the roller pump and / or fluid hose. This ensures that control of the roller pump, for example by a central control device, preferably via suitable control parameters, leads to pump outputs, such as volume rates, that do not depend on how individual production-related tolerances add up or average out in the result. This advantageously makes it possible to avoid the respective roller pump having to be subsequently standardized in order to ensure a desired pump characteristic, but rather that the tolerance compensation is already established on the pump side.

[0025] In a further, particularly advantageous embodiment of the roller pump, a carriage that is linearly movable along a compensation direction is formed in the housing, which carriage forms at least part of the radially outer section of the hose guide in the region of the rotor. The carriage is preloaded toward the rotor along the compensation direction by means of elastic preloading means. The carriage can advantageously act as a tolerance compensation device.

[0026] To ensure the long-term operation of the fluid hose or milk hose without excessive wear, it is particularly important that the fluid hose and the roller pump are optimally matched. However, both the individual components of the roller pump and the fluid hose itself are subject to unavoidable manufacturing tolerances. To compensate for this, it can be particularly advantageous if the part of the hose guide opposite the rollers or guide shoes of the rotor is adjustable and, in particular, self-adjusting, so that manufacturing tolerances are balanced or compensated.

[0027] This also particularly advantageously ensures that the pump characteristics of different pumps are not influenced or changed by manufacturing tolerances, but that different pumps have identical or at least highly similar pump properties, for example for a predetermined movement of the rotor via a current supply to a drive motor. This compensation can be achieved particularly advantageously if a carriage is formed in the housing which is linearly movable along a compensation direction, which forms part of the radially outer hose guide and which is also pretensioned in the direction of the rotor via pretensioning means. As will be explained in more detail later in the description, such a carriage also has the advantage that removal and / or replacement of the fluid hose is made particularly easy and advantageous.

[0028] In a further, particularly desirable embodiment of the roller pump, it can also be provided that a stop is formed in the housing, which limits the linear movement of the movably mounted carriage against the pretension of the elastic pretensioning means and / or defines a minimum distance in the area of ​​the hose guide.

[0029] This ensures that the carriage compensates for manufacturing tolerances, thereby protecting the fluid hose from excessive wear and standardizing the pumping characteristics of the roller pump. At the same time, it also prevents excessive, sustained pressure and resulting deformation of the fluid hose, which could in turn lead to fatigue or wear. The minimum clearance is essentially formed between the rotor and the hose guide.

[0030] Furthermore, in an advantageous embodiment, it can be provided that the roller pump comprises an actuating mechanism, preferably a slide or lever mechanism, with which the carriage can be moved, and preferably locked, in the compensation direction against the preload.

[0031] As already indicated above, the movably mounted and preloaded carriage, when moving counter to the preload direction or compensation direction, can at least partially increase the distance between the radially outer hose guide and the rotor of the roller pump, including the rollers or sliding shoes, which in turn leads to the release of the fluid hose and accordingly enables and facilitates removal of the fluid hose. Particularly advantageously, said movement of the carriage counter to the compensation direction and counter to the preload of the preloading means can be provided via an actuating mechanism, preferably a slide mechanism or lever mechanism.Particularly advantageously, the actuating mechanism can be provided with a locking mechanism in a release state of the slide, so that the fluid hose can be safely and easily removed and reinserted without the preloading means accidentally accelerating the slide back onto the rotor. Furthermore, the actuating mechanism does not need to be kept permanently activated during the replacement or removal and reinstallation of the fluid hose, but can be released from the locking mechanism after reinstallation.

[0032] In a likewise advantageous variant of the roller pump, it can be provided that a cover of the housing is designed such that it can be transferred into a secured state and a released state depending on the state of the actuating mechanism. This ensures that both the removability of the cover and, alternatively, the securing of the cover and the movement of the carriage against the pretension to release the fluid hose can be achieved via one and the same actuating mechanism. In other words, this means that a user who operates the actuating mechanism and particularly preferably thereby locks the movable carriage in a retracted position against the pretension of the pretensioning means, simultaneously also releases the cover of the housing or part of a housing cover.Conversely, it can be provided that if the actuating mechanism causes the slide to secure / clamp the fluid hose between the rotor and the radially outer hose guide via the pretensioning means, the cover of the housing of the roller pump is / is secured accordingly.

[0033] The above-mentioned problem is also solved by a molded hose as a fluid hose for media guidance in a roller pump, in particular a roller pump according to one of the previously described embodiments, wherein the molded hose is made of flexible material and encloses a line volume and, according to the invention, it is also provided that the molded hose has securing projections on an outer surface which can engage in complementarily designed relief widenings of the housing of the roller pump and, when inserted, bring about a tension and / or pressure relief of the molded hose acting as a fluid hose.

[0034] Such a molded hose according to the invention can be manufactured, for example, from several individual parts using appropriate casting processes or as a single, monolithic component. Particularly preferably, the securing projections are formed integrally with the other molded hose or fluid hose to ensure the best possible force transmission from the molded hose via its securing projections into the housing of the roller pump.

[0035] In this context, it can be particularly advantageous for the securing projections to be formed integrally with the molded hose. This can also be achieved, for example, by subsequently injecting the securing projections onto an existing hose using generally known injection molding processes, which create a material-to-material connection between the securing projections and the rest of the molded hose.

[0036] In a further, particularly advantageous embodiment of the molded hose, it can be provided that it has means that form a vortex chamber for heating the fluid, preferably milk, conveyed in the molded hose or, when inserted, form a vortex chamber together with means of the roller pump, in particular the housing of the roller pump. By integrating the means for forming a vortex chamber, a further functionality can be integrated into the molded hose in a special way. Thus, in addition to pure fluid guidance and improved force absorption and force introduction within the pump, the molded hose can also enable or support effective heating.

[0037] As already described above, this improves the introduction of the search and pressure forces into the housing of the roller pump and at the same time ensures a spatial integration of a frothing and / or heating effect into the milk pump in the form of a roller pump, which otherwise only provides the volume flow.

[0038] The above-mentioned object is also achieved by a milk module for beverage preparation devices, in particular for coffee and / or espresso machines, which has a roller pump according to one of the previously described embodiments and a molded hose inserted therein according to one of the previously described embodiments.

[0039] The milk module according to the invention can at least significantly reduce wear on the fluid hoses or molded hoses, thereby significantly improving their longevity. At the same time, the advantages of a roller pump can be utilized. Depending on the design, the frothing and / or heating of the milk can also be integrated into the roller pump, or at least its housing, by means of a vortex chamber partially formed in the molded hose and the pump housing.

[0040] Advantageous embodiments of the present invention will be discussed below by way of example with reference to the merely schematic drawings.

[0041] Showing: Fig. 1: a perspective view of a roller pump according to the invention; Fig. 2: a perspective view of a roller pump according to the invention according to Fig. 1 with lid removed; Fig. 3: a perspective sectional view through a roller pump according to the invention with inserted molded hose; Fig. 4: a plan view of a roller pump according to the invention; Fig. 5: a perspective view of a molded hose according to the invention.

[0042] Fig. 1 shows a perspective view of a roller pump 01 according to the invention. It shows a housing 02, a gear motor 03 arranged on the bottom of the housing 02, a cover 04 of the housing 02, inlet and outlet connections 05, 06 of a fluid hose 07, and an actuating mechanism 08 arranged on the two-part cover 04.

[0043] In the presentation of the Fig. 2, a cover 04 has been removed, preferably by moving the actuating mechanism 08 away from the rotor 09 in the direction of a compensation direction A, so that a projection 10 of the actuating mechanism 08 has exposed the removed part of the cover 04. In the view with the partially removed cover 04, it can be seen that a rotor 09 is arranged in the housing 02 of the roller pump 01, which rotor drives a plurality of rollers 11. As an alternative to the rollers 11, sliding shoes or the like can be used. The housing 02 also forms a hose guide 12. The fluid hose 07 is inserted in the hose guide 12. In a part of the hose guide 12, the fluid hose is contacted radially on the inside by the rollers 11 of the rotor 09. When the rotor 09 is driven, the rollers 11, in interaction or cooperation with the hose guide, ensure that the cross-section of the fluid hose 07 is changed up to the point of constricting the cross-section.Upon further rotation of the rotor 09, the cross-section of the fluid hose is enlarged again. This creates a volume flow and a pumping effect.

[0044] The housing 02 of the roller pump 01 comprises relief expansions 13 on both the inlet and outlet sides, into which the securing projections 14 of the fluid hose 07 engage. The relief expansions 13 and the securing projections 14 are each arranged between the inlet or outlet of the roller pump 01 and the area of ​​the hose guide 12 in which the rollers 11 engage with the fluid hose 07. Through the interaction of the relief expansions 13 and the securing projections 14, compressive and / or tensile forces on the fluid hose 07 can be particularly preferably introduced into the roller pump 01 and the housing 02. This reduces wear on the fluid hose 07.

[0045] The fluid hose 07 also has upper securing projections 15 which engage or are operatively connected to the removed part of the cover 04 of the housing 02 when the corresponding cover part is placed and secured.

[0046] In addition, the Fig. 2 that the fluid hose 07 comprises means that form a vortex chamber 16 or, together with corresponding countercomponents on the side of the housing 02 of the roller pump 01, form a vortex chamber 16. The vortex chamber 16 can be used to heat and / or froth milk before it exits the roller pump 01. For this purpose, a heat transfer fluid can be introduced into the vortex chamber, for example via a central, internal chamber that is connected to an associated supply line and an inner wall of the vortex chamber.

[0047] In the sectional view of the Fig. 3 shows that the vortex chamber 16 has such an internal chamber 17 through which a heat transfer fluid, for example steam and / or hot water, can be introduced into the vortex chamber.

[0048] In addition to the securing projections 14 and the associated relief expansions 13 in the housing 02 of the roller pump 01, the sectional view of the Fig. 3 that a movably mounted carriage 18 is arranged in the housing 02 of the roller pump 01. The carriage 18 is mounted on guide means which, in the embodiment of Fig. 3 are designed as sliding rods 19, are movably mounted. Furthermore, two helical springs 20 are arranged on the sliding rods 19 as elastically deformable preloading means, which are supported on one side by projections 21 of the sliding rods and on the other side by guide bushings 22 of the carriage 18 and thus apply force to the carriage 18 in the compensation direction A on the rotor 09.

[0049] This allows compensation for any manufacturing-related tolerances of the components involved when a fluid hose 07 is inserted. At the same time, the slide, in combination with the actuating mechanism 08, enables easy removal and reinsertion of the fluid hose 07. This is because if the movable slide 18 is moved away from the rotor 09 in the compensation direction A via the actuating mechanism 08, the distance between the rotor 09 and the radially outer side of the hose guide 12 is increased, thus facilitating the removal and insertion of the fluid hose 07. It can be provided in a particularly advantageous manner that the actuating mechanism 08 can be used to lock the slide in a retracted position of the slide 18. The pretensioning means must exert sufficient force / pressure that the pumping effect is not impaired or not noticeably impaired.Otherwise, the rollers would no longer ensure sufficient deformation of the fluid hose 07, which is necessary for the basic pumping principle.

[0050] In the top view of the Fig. The movable carriage is shown again in Figure 4. In the illustration of the Fig. 4 shows that a stop is provided at the transition 26 from the carriage 18 to the rest of the housing 02 of the roller pump 01, which defines a minimum distance 23 in the area of ​​the hose guide 12, which is arranged opposite the rollers 11 of the rotor 09. The minimum distance 23 ensures that the Fig. 4, the fluid hose 07 (not shown and therefore not used) is not subjected to excessive force and is not permanently deformed excessively during operation of the roller pump 01 or when the roller pump 01 is at a standstill. This ensures that premature or excessive wear of the fluid hose 07 or other signs of wear do not occur.

[0051] In the presentation of the Fig. 4 it can also be seen that the housing 02 provides or forms parts of the vortex chamber 16, wherein the vortex chamber 16 is only finally formed by the fluid hose 07 being inserted.

[0052] In the presentation of the Fig.Figure 5 again shows the fluid hose 07, designed as a molded hose 24. The molded hose 24 is made of flexible material and encloses a conduit volume. On an outer surface 25, the molded hose comprises the securing projections 14, which, when inserted, interact with the relief expansions 13 of the housing 02 of the roller pump 01. Furthermore, the molded hose 24 comprises the upper securing projections 15 and means for forming the vortex chamber 16. Reference symbol 01 Roller pump 02 Housing 03 Gear motor 04 Lid 05 Inlet connection 06 Outlet connection 07 Fluid hose 08 Operating mechanism 09 Rotor 10 Overhang 11 rolls 12 Hose guide 13 relief widenings 14 securing projections 15 upper safety projection 16 vortex chamber 17 Chamber 18 sleds 19 sliding bars 20 coil springs 21 lead 22 guide bushings 23 Minimum distance 24 molded hose 25 Exterior surface 26 Transition A compensation direction QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 20 2016 006 814 U1

[0004] DE 10 2007 024 443 A1

[0004] EP 1 472 963 B1

[0004] EP 2 215 942 A1

[0004] EP 2 570 060 B1

[0004] EP 2 798 987 B1

[0004]

Claims

[1] Roller pump (01) for a milk module for beverage preparation devices, comprising a housing (02) in which a hose guide (12) for a flexible fluid hose (07), preferably a milk hose, is formed, and a rotor (09) with rollers (14) or sliding shoes arranged thereon for section-wise, radially inner contact with the fluid hose (07) characterized by that the hose guide (12) has one, preferably several, particularly preferably two, relief widenings (13) which are shaped such that complementarily designed securing projections (14, 15) of the fluid hose (07) can engage in the relief widenings (13) and, in the inserted state, bring about a tensile and / or pressure relief of the fluid hose (07). [2] Roller pump according to claim 1, characterized by that the relief widenings (13) are formed in addition to the housing inlet and / or housing outlet side widenings. [3] Roller pump according to claim 1 or 2, characterized by that the relief widenings (13) comprise a contour for receiving and / or forming a vortex chamber (16) for foaming and / or heating the pumped fluid, preferably the milk. [4] Roller pump according to one of the preceding claims, characterized by that the hose guide (12) and / or rotor (09) is / are designed to cooperate with a tolerance compensation device, so that manufacturing-related tolerances have no or only a reduced effect on the pump functionality and the pump characteristics and / or are constant within the scope of the sum of all manufacturing tolerances of the roller pump (01) and / or fluid hose (07). [5] Roller pump according to one of the preceding claims, characterized byin that a carriage (18) which is linearly movable along a compensation direction and forms at least part of the radially outer section of the hose guide (12) in the region of the rotor (09) is formed in the housing (02), wherein the carriage (18) is prestressed towards the rotor (09) along the compensation direction by means of an elastic prestressing means. [6] Roller pump according to claim 5, characterized by a stop in the housing (02) which limits the linear movement of the carriage (18) against the preload and / or defines a minimum distance (23) in the area of ​​the hose guide (12). [7] Roller pump according to claim 5 or 6, characterized by an actuating mechanism (08) with which the slide (18) can be moved, and preferably locked, in the compensation direction against the preload. [8] Roller pump according to claim 7, characterized bythat a cover (04) of the housing (02) is designed such that it can be transferred into a securing state and a release state depending on the state of the actuating mechanism (08). [9] Moulded hose (24) for media guidance in a roller pump, in particular a roller pump according to one of claims 1 to 7, for a milk module for beverage preparation devices, wherein the moulded hose (24) is made of flexible material and encloses a line volume, characterized by that the molded hose (24) has securing projections (14, 15) on an outer surface (25) which can engage in complementarily designed relief widenings (13) of the housing (02) of the roller pump and, when inserted, bring about a tension and / or pressure relief of the molded hose (24) acting as a fluid hose (07). [10] Moulded hose according to claim 9, characterized bythat the molded tube (24) has means which form a vortex chamber (16) for foaming and / or heating the fluid, preferably the milk, guided in the molded tube (24) or, in the inserted state, form a vortex chamber (16) together with means of the roller pump. [11] Moulded hose according to claim 9 or 10, characterized by that the molded hose (24) together with the securing projections (14, 15) is formed in one piece. [12] Milk module for beverage preparation devices with a roller pump according to one of claims 1 to 7 and a molded hose (24) according to one of claims 9 to 11 inserted therein.

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