Mixing device and method for mixing at least two fluids

Abstract

A mixing device (100) comprises a housing (41, 42); at least one first supply channel (20) having a first outlet, a second supply channel (21) having a second outlet, and a discharge channel (30) having an inlet; a mixing chamber (10) in the housing, wherein the mixing chamber is connected to the first supply channel in a fluid-communicating manner via the first outlet, to the second supply channel in a fluid-communicating manner via the second outlet, and to the discharge channel in a fluid-communicating manner via the inlet, and wherein the mixing chamber has a volume of at most 5000 μl; and a mixing element (15) which is arranged in the mixing chamber and which is designed to mix a first fluid from the first supply channel and a second fluid from the second supply channel to form a mixture, wherein the mixture can be discharged into the discharge channel; wherein (I) the first outlet and the second outlet are spaced apart from one another and / or (II) the first supply channel and the second supply channel are spaced apart from one another at a distance from the mixing chamber of at least 15.0 mm.

Description

[0001] Mixing device and method for mixing at least two fluids

[0002] The present disclosure relates to a mixing device and a method for mixing at least two fluids.

[0003] background

[0004] In flow chemistry, at least two streams containing reactants are combined so that the reactants can react with each other. This is achieved using static mixers, such as T-mixers or Y-mixers, or active mixers.

[0005] Especially in the development of new materials or substances, e.g., in pharmaceutical development, starting materials are only available in small quantities and reactions can proceed rapidly. It is often necessary to design the processes so that residence times and mixing times are short. This can be achieved by a relatively high volumetric flow rate of the two reactant streams, for which, however, a sufficient quantity of reactants must be available.

[0006] Processes in which a static mixing element and an active mixing element are used to mix two fluids with reactants are often inflexible and allow only a poorly defined and controlled mixing, resulting in a poorly defined and controlled reaction of the reactants.

[0007] Disclosure of the invention

[0008] One objective of the present disclosure is to enable a defined and controlled mixing of two or more fluids. A further objective is to provide a flexibly usable and / or adaptable mixing device.

[0009] At least one of the problems is solved by the features of the independent claims. Preferred embodiments are specified in the dependent claims and the description. A mixing device according to one embodiment is disclosed. The mixing device comprises a housing. Furthermore, the mixing device comprises at least a first feed channel with a first outlet, a second feed channel with a second outlet, and a discharge channel with an inlet. The mixing device further comprises a mixing chamber in the housing. The mixing chamber is fluidly connected to the first feed channel via the first outlet. The mixing chamber is fluidly connected to the second feed channel via the second outlet. The mixing chamber is fluidly connected to the discharge channel via the inlet. The mixing chamber can have a volume of at most 5000 l (microliters). The mixing device further comprises a mixing element.The mixing element is arranged in the mixing chamber and is configured to mix a first fluid from the first feed channel and a second fluid from the second feed channel into a mixture. The mixture can be discharged into the discharge channel. The first and second outlets can be spaced apart from each other. Alternatively, or in addition to the spacing of the first and second outlets, the first and second feed channels can be spaced apart from each other at a distance of at least 15.0 mm from the mixing chamber.

[0010] A mixing device according to a further embodiment is disclosed. The mixing device comprises a housing. Furthermore, the mixing device comprises at least a first feed channel with a first outlet, a second feed channel with a second outlet, and a discharge channel with an inlet. The mixing device further comprises a mixing chamber within the housing. The mixing chamber is fluidly connected to the first feed channel via the first outlet. The mixing chamber is fluidly connected to the second feed channel via the second outlet. The mixing chamber is fluidly connected to the discharge channel via the inlet. The mixing chamber can have a volume of at most 5000 l (microliters). The mixing device further comprises a mixing element. The mixing element is rotatable about an axis.The mixing element is arranged in the mixing chamber and is configured to mix a first fluid from the first feed channel and a second fluid from the second feed channel into a mixture. The mixture can be discharged into the discharge channel. The mixing chamber has a mixing chamber base and a mixing chamber side wall. The mixing chamber base is oriented non-parallel to the axis, in particular substantially perpendicular to it. The mixing chamber side wall adjoins the mixing chamber base. The first outlet, the second outlet, and / or the inlet are at least partially formed in the mixing chamber side wall.

[0011] A mixing device according to a further embodiment is disclosed. The mixing device comprises a housing. The housing has a first housing part and a second housing part. Furthermore, the mixing device comprises at least a first feed channel with a first outlet, a second feed channel with a second outlet, and a discharge channel with an inlet. The mixing device further comprises a mixing chamber in the housing. The mixing chamber is fluidly connected to the first feed channel via the first outlet. The mixing chamber is fluidly connected to the second feed channel via the second outlet. The mixing chamber is fluidly connected to the discharge channel via the inlet. The mixing chamber can have a volume of at most 5000 l (microliters). The mixing device further comprises a mixing element.The mixing element is arranged in the mixing chamber and is configured to mix a first fluid from the first feed channel and a second fluid from the second feed channel into a mixture. The mixture can be discharged into the discharge channel. The first housing part is detachably connected to the second housing part. The mixing chamber, the first feed channel, the second feed channel, and / or the discharge channel are at least partially formed within the first housing part.

[0012] Features of the mixing devices of the embodiments are interchangeable or supplementary within the embodiments.

[0013] In particular, any mixing device disclosed herein may include one or more of the following features:

[0014] - the first outlet and the second outlet are spaced apart from each other;

[0015] - the first feed channel and the second feed channel are spaced at a distance of at least 15.0 mm from each other to the mixing chamber;

[0016] - the mixing element can be rotated around an axis;

[0017] - the mixing chamber has a mixing chamber bottom and a mixing chamber side wall, wherein the mixing chamber bottom is oriented non-parallel, in particular substantially perpendicular, to the axis and the mixing chamber side wall adjoins the mixing chamber bottom, and wherein the first outlet, the second outlet and / or the inlet is formed at least partially in the mixing chamber side wall;

[0018] - the housing comprises a first housing part and a second housing part;

[0019] - the first housing part is detachably connected to the second housing part and the mixing chamber, the first feed channel, the second feed channel and / or the discharge channel is at least partially formed in the first housing part.

[0020] A method for mixing at least two fluids in a mixing device is disclosed. The mixing device can be any mixing device disclosed herein. The method comprises the steps of: introducing the first fluid into the mixing chamber via the first outlet of the first feed channel; introducing the second fluid into the mixing chamber via the second outlet of the second feed channel; mixing the first fluid and the second fluid in the mixing chamber by moving the mixing element to obtain a mixture; and discharging the mixture into the inlet of the discharge channel.

[0021] By spacing the first outlet of the first feed channel and the second outlet of the second feed channel, or the first and second feed channels, a defined and controlled mixing of the fluids from the first and second feed channels is achieved in the mixing chamber. The fluids, or the components within the fluids, first come into contact in the mixing chamber or shortly before it (e.g., at a distance of no more than 15.0 mm). This prevents relatively undefined or uncontrolled mixing outside the mixing chamber.

[0022] If the first and / or second feed channel is integrated into a housing part, replacing components of the mixing device and cleaning the mixing device are facilitated or even made possible. For example, the first and / or second feed channel in the housing part can be designed such that an outlet or outlets are located laterally in the mixing chamber (i.e., in the side wall of the mixing chamber). This allows the outlets to be spaced apart. Furthermore, different housing parts with different feed channels, e.g., with geometrically different feed channels, can be connected to another housing part, allowing one part of the mixing device to be used for various mixing tasks. Thus, for different mixing tasks, only one part of the housing needs to be replaced, while another part of the housing can remain the same for all mixing tasks.Preferably, the part of the housing that is the same for different mixing tasks comprises the drive and / or a bearing for the shaft. The part of the housing that is the same for different mixing tasks can be the second housing part disclosed herein. The part of the housing that is different for different mixing tasks can be the first housing part disclosed herein.

[0023] In general, the mixing device can be a micro-mixing device. The volume of the mixing chamber is preferably at most 5000 pl. The mixing chamber can have a volume of at most 2500 pl, preferably at most 1000 pl, preferably at most 800 pl, preferably at most 500 pl, preferably at most 250 pl, preferably at most 150 pl, preferably at most 75 pl, preferably at most 50 pl, preferably at most 30 pl, preferably at most 15 pl, preferably at most 10 pl.

[0024] The volume of the mixing chamber can be considered as the volume containing a mixing element. Alternatively, the volume of the mixing chamber can be considered as the volume without any element, in particular without a mixing element.

[0025] Due to the small volume of the mixing chamber, the residence time of the fluids to be mixed, or of mixtures of fluids, is very short. This also applies to relatively low fluid flow rates.

[0026] The housing of the mixing device can comprise or be made of metal, plastic, or ceramic. Preferably, the housing is multi-part, i.e., it can comprise at least two housing parts. The housing can also comprise more than two housing parts. Each of the housing parts can comprise or be made of metal, plastic, or ceramic. The housing parts can comprise or be made of the same or different materials.

[0027] Preferably, the first feed channel, the second feed channel, and / or the discharge channel are formed within the housing. For example, the first feed channel, the second feed channel, and / or the discharge channel are milled, drilled, or eroded into the housing. The housing, or the first feed channel, the second feed channel, and / or the discharge channel, may be or have been manufactured by 3D printing.

[0028] The first feed channel, the second feed channel, and / or the discharge channel can have a circular or rectangular cross-section. The cross-section can be oriented perpendicular to the longitudinal extent or perpendicular to the flow direction through the respective channel.

[0029] The first outlet of the first feed channel and the second outlet of the second feed channel can be considered the ends of the channels in the direction of flow. The outlets can lead directly into the mixing chamber. The outlets can be considered the inlets or inlets of the mixing chamber.

[0030] The inlet of the discharge channel can be considered the beginning of the discharge channel in the direction of flow. The inlet can originate directly from the mixing chamber. The inlet can also be considered the outlet of the mixing chamber.

[0031] A first fluid can flow into the mixing chamber via the first outlet of the first feed channel, and a second fluid can flow into the mixing chamber via the second outlet of the second feed channel. Preferably, the first and second feed channels are configured such that the first and second fluids come into contact for the first time in the mixing chamber.

[0032] The first, second, and / or subsequent fluids can each be a liquid (liquid at 20 °C and 1 bar). The first and / or second fluids can each be a pure liquid, a solution, a gas or gas mixture, or a dispersion. The first and / or second fluids can each contain at least one substance or reactant. Mixing the fluids can initiate a physical and / or chemical process involving the substances or reactants. For example, fluids can (physically) form a dispersion, or substances in the fluids can (chemically) react with each other. The application of the mixing device is not limited to a specific temperature or pressure. In general, any mixture disclosed herein can be a solution or a dispersion. The mixture can contain two or more components. The mixture can be homogeneous or heterogeneous.

[0033] The mixing device can comprise more than two feed channels, each with an outlet. Preferably, the mixing device comprises at least three feed channels, more preferably at least four, more preferably at least five, and more preferably at least six feed channels, each with an outlet. Each of the feed channels can have one or more features of the first and / or second feed channel. In particular, the outlets of all feed channels can be spaced apart from one another. A fluid can be introduced into the mixing chamber from each of the feed channels. All fluids can be mixed to form a mixture.

[0034] The mixture, comprising at least the first fluid and the second fluid, can be discharged from the mixing chamber via the discharge channel. For this purpose, the mixture can flow from the mixing chamber into the inlet of the discharge channel.

[0035] The mixing device can comprise more than one discharge channel. Preferably, the mixing device comprises at least two discharge channels, more preferably at least three discharge channels, and more preferably at least four discharge channels, each with an inlet. The inlets of all discharge channels can be spaced apart from one another. A mixture or a partial mixture can be discharged from the mixing chamber into each of the discharge channels.

[0036] The mixing chamber can be essentially cylindrical. Other geometries are possible and are described in more detail, particularly with reference to the figures. Specifically, the cross-section of the mixing chamber can be constant or varying. For example, the cross-section can be constant over the entire height of the mixing chamber. Likewise, the cross-section, and especially the cross-sectional area, can decrease or increase with increasing height. The mixing chamber can be conical, frustoconical, hemispherical, or spherical. The cross-section of the mixing chamber can be rotationally symmetrical or non-rotationally symmetrical. The cross-section of the mixing chamber can be circular or non-circular or non-circular. Generally, the cross-section can be oriented parallel to the bottom of the mixing chamber or perpendicular to the axis of rotation of the mixing element.

[0037] The mixing element in the mixing chamber can be configured to actively mix the first and second fluids. The mixing element can be configured to introduce energy into the first and second fluids, or into the mixture comprising at least the first and second fluids. The mixing element can be rotatable. The mixing element can have various geometries, which are described in particular with reference to the figures.

[0038] The mixing element can be arranged centrally or eccentrically in the mixing chamber. The axis of rotation of the mixing element can be central or eccentric to the axis of rotation of the mixing chamber. "Central" or "eccentric" can refer to a plane perpendicular to the axis of rotation of the shaft and / or the mixing element. The (geometric) center point of the mixing chamber can lie in the same plane as the (geometric) center point of the mixing element or be located away from it.

[0039] The mixing element can have the shape of a propeller, a stirrer, a rotor, or another shaped element. Preferably, the mixing element does not include or is not a bead or sphere.

[0040] The mixing element can be formed in one piece. It cannot be composed of several separate or movable elements. If the mixing element consists of at least two elements, these elements can be positively engaged, bonded, or screwed together.

[0041] The mixing element allows the first and / or second fluid to be transported around it. The first and / or second fluid cannot flow through the mixing element, particularly if the mixing element is located within the mixing device. The mixing element cannot be permeable to the first and / or second fluid, particularly if the mixing element is located within the mixing device. The mixing element can be configured to transport the first and / or second fluid (exclusively) in a peripheral region of the mixing chamber. The center of the mixing element (in a plane perpendicular to the axis of rotation of the mixing element) cannot be permeable to the first and / or second fluid. The center of the mixing chamber (in a plane perpendicular to the axis of rotation of the mixing element) cannot be permeable to the first and / or second fluid.The center can be an area with an extent of at least 10%, preferably at least 20%, preferably at least 30%, preferably at least 40%, preferably at least 50% of the largest (straight-line) extent of the mixing element.

[0042] The height of the mixing element (along the axis of rotation of the shaft and / or along the axis of rotation of the shaft) can be at most 20 mm, preferably at most 15 mm, preferably at most 10 mm, preferably at most 7.5 mm, preferably at most 6 mm, preferably at most 4 mm, preferably at most 2.5 mm, preferably at most 1.5 mm.

[0043] The diameter or radial extent of the mixing element (perpendicular to the axis of rotation of the shaft and / or perpendicular to the axis of rotation of the shaft) can be at most 20 mm, preferably at most 15 mm, preferably at most 11 mm, preferably at most 7.5 mm, preferably at most 5 mm, preferably at most 3 mm.

[0044] The first outlet of the first feed channel and the second outlet of the second feed channel can be spaced at least 10 m apart. Preferably, the first outlet of the first feed channel and the second outlet of the second feed channel are spaced at least 50 pm apart, more preferably at least 100 pm apart, more preferably at least 250 pm apart, more preferably at least 500 pm apart, more preferably at least 750 pm apart, more preferably at least 1000 pm apart, more preferably at least 2000 pm apart, more preferably at least 3000 pm apart, more preferably at least 5000 pm apart.

[0045] The first outlet of the first feed channel and the second outlet of the second feed channel can be spaced at most 10,000 pm apart. Preferably, the first outlet of the first feed channel and the second outlet of the second feed channel are spaced at most 5,000 pm apart, more preferably at most 1,000 pm apart, more preferably at most 500 pm apart, more preferably at most 250 pm apart, and more preferably at most 100 pm apart. The distance between the first outlet of the first feed channel and the second outlet of the second feed channel can be the shortest possible distance. This distance can be understood as a straight line.

[0046] The distance between the first outlet of the first feed channel and the second outlet of the second feed channel can be at least 10%, preferably at least 25%, preferably at least 50%, preferably at least 75%, preferably at least 100% of the width or diameter of the first feed channel and / or the second feed channel.

[0047] The distance between the first outlet of the first feed channel and the second outlet of the second feed channel can be at most 100%, preferably at most 75%, preferably at most 50%, preferably at most 25%, preferably at most 10% of the width or diameter of the first feed channel and / or the second feed channel.

[0048] The first and second feed channels can be spaced at least 15.0 mm apart from the mixing chamber. If the first and second feed channels are spaced apart, they cannot be in fluid communication (within a certain region). However, if they are close to the mixing chamber, the first and second feed channels can be fluid-communicationally connected. The distance can be the distance between a point in the first or second feed channel and the mixing chamber. The distance to the mixing chamber can be the shortest possible distance.

[0049] Preferably, the first feed channel and the second feed channel are spaced apart from the mixing chamber by a distance of at least 13.0 mm, preferably at least 11.0 mm, preferably at least 9.0 mm, preferably at least 7.0 mm, preferably at least 5.0 mm, preferably at least 3.0 mm, preferably at least 2.0 mm, preferably at least 1.0 mm, preferably at least 0.5 mm, more preferably at least 0.25 mm, more preferably at least 0.1 mm. If the distance to the mixing chamber is smaller, e.g. less than 15.0 mm, less than 13.0 mm, less than 11.0 mm, less than 9.0 mm, less than 7.0 mm, less than 5.0 mm, less than 3.0 mm, less than 2.0 mm, less than 1.0 mm, less than 0.5 mm, less than 0.25 mm or less than 0.1 mm, the first feed channel and the second feed channel cannot be separated from each other (i.e. fluidly communicating).

[0050] The first feed channel and the second feed channel can be fluidly connected (i.e., not spaced apart) at a distance to the mixing chamber of at most 15.0 mm, preferably at most 13.0 mm, preferably at most 11.0 mm, preferably at most 9.0 mm, preferably at most 7.0 mm, preferably at most 5.0 mm, preferably at most 3.0 mm, preferably at most 2.0 mm, preferably at most 1.0 mm, preferably at most 0.5 mm, more preferably at most 0.25 mm, more preferably at most 0.1 mm. For larger distances to the mixing chamber, e.g. greater than 15.0 mm, greater than 13.0 mm, greater than 11.0 mm, greater than 9.0 mm, greater than 7.0 mm, greater than 5.0 mm, greater than 3.0 mm, greater than 2.0 mm, greater than 1.0 mm, greater than 0.5 mm, greater than 0.25 mm or greater than 0.1 mm, the first feed channel and the second feed channel can be spaced apart from each other (i.e., not fluid-communicatingly connected).

[0051] The first feed channel and the second feed channel can be spaced apart from the mixing chamber by a distance of 15.0 mm, preferably 13.0 mm, preferably 11.0 mm, preferably 9.0 mm, preferably 7.0 mm, preferably 5.0 mm, preferably 3.0 mm, preferably 2.0 mm, preferably 1.0 mm, preferably 0.5 mm, preferably 0.25 mm, preferably 0.1 mm.

[0052] The first feed channel and the second feed channel can be fluidly connected at a distance from the mixing chamber of 14.5 mm, preferably 12.5 mm, preferably 10.5 mm, preferably 8.5 mm, preferably 6.5 mm, preferably 4.5 mm, preferably 2.5 mm, preferably 1.5 mm, preferably 0.5 mm, preferably 0.4 mm, preferably 0.2 mm, preferably 0.1 mm.

[0053] The first and second outlets cannot be separated from each other within the wall of the mixing chamber. This means that the first and second outlets can overlap or coincide within the wall of the mixing chamber.

[0054] A first feed channel axis can be defined by the center points of the first feed channel along the flow direction (by the center points of the cross-section perpendicular to the flow direction). A second feed channel axis can be defined by the center points of the second feed channel (by the center points of the cross-section perpendicular to the flow direction).

[0055] The angle between the first feed channel axis and the second feed channel axis can be at least 5°, preferably at least 10°, preferably at least 15°, preferably at least 20°, preferably at least 25°, preferably at least 30°, preferably at least 35°, preferably at least 40°, preferably at least 45°, preferably at least 50°, preferably at least 60°, preferably at least 70°, preferably at least 80°, preferably at least 90°.

[0056] The angle between the first feed channel axis and the second feed channel axis can be at most 90°, preferably at most 80°, preferably at most 70°, preferably at most 60°, preferably at most 50°, preferably at most 45°, preferably at most 40°, preferably at most 35°, preferably at most 30°, preferably at most 25°, preferably at most 20°, preferably at most 15°, preferably at most 10°, preferably at most 5°.

[0057] The mixing device may include a drive unit. The drive unit may be configured to move the mixing element to mix the first and second fluids. In particular, the drive unit is configured to rotate the mixing element. The drive unit may be configured to rotate the mixing element at a variable speed. This allows the mixing quality to be adjusted independently of the flow rate. The power required for mixing cannot be achieved (solely) from the pressure drop across the mixer.

[0058] The drive can be configured to rotate the mixing element at a speed of at least 50 rpm (revolutions per minute), preferably at least 100 rpm, preferably at least 500 rpm, preferably at least 1000 rpm, more preferably at least 2500 rpm, more preferably at least 5000 rpm, more preferably at least 7500 rpm, more preferably at least 10000 rpm, more preferably at least 15000 rpm, more preferably at least 20000 rpm, more preferably at least 30000 rpm, more preferably at least 40000 rpm. The drive is particularly preferably configured to rotate the mixing element at a speed between 500 rpm and 10,000 rpm, more preferably between 2,000 rpm and 10,000 rpm, more preferably between 4,000 rpm and 8,000 rpm, and more preferably between 5,000 rpm and 7,000 rpm. The drive can also be configured to rotate the mixing element at a speed of at most 50,000 rpm, more preferably at most 40,000 rpm, and more preferably at most 30,000 rpm.

[0059] The drive can include a motor, especially an electric motor.

[0060] The drive can be connected to the housing. In particular, the drive can be detachably connected to the housing. The drive can also be permanently connected to the housing. "Permanently" can mean that the connection cannot be disconnected without causing damage or destruction.

[0061] The drive can be an electromagnetic drive. The drive can be configured to generate a magnetic field. Likewise, the drive can generate a magnetic field. For example, the drive can include or drive a permanent magnet. The mixing element can have magnetic properties. This allows the drive and the mixing element to be magnetically coupled, so that movement of the drive causes movement of the mixing element. The movement can be rotational.

[0062] The drive can be configured to move the mixing element in different directions. For example, the drive can be set to rotate the mixing element clockwise and (with a time offset) counterclockwise. The direction of movement of the mixing element can be adapted to the specific mixing task.

[0063] The mixing element can be fully rotatable around its axis of rotation. The mixing element can be rotatable by at least 360° or by more than 360° (e.g., by more than 380° or more than 720°) around its axis of rotation. In particular, the mixing element can be rotated by means of the drive.

[0064] The mixing device may include a shaft. The shaft may be connected to a drive and the mixing element, so that a force can be transmitted from the drive to the mixing element. The shaft may be a drive shaft. For example, the shaft may be essentially (at least partially) cylindrical. The mixing device may include a bearing sleeve. The shaft may be supported by the bearing sleeve. In particular, the shaft may protrude through the bearing sleeve, for example, through a recess in the bearing sleeve. The shaft may be radially supported by the bearing sleeve. The bearing sleeve may be arranged in the housing. The bearing sleeve may comprise or be made of metal or plastic.

[0065] The mixing device may include a shaft seal. The shaft seal may be arranged in the housing such that the mixing chamber is sealed (at least axially) from the drive. The shaft seal may have a recess through which the shaft can protrude. In particular, the recess of the shaft seal is aligned with the recess of the bearing sleeve. The shaft seal may be arranged within the housing. The shaft seal may comprise or consist of metal or plastic. For example, the shaft seal may comprise or consist of an elastomer.

[0066] The mixing device may include an axial shaft bearing. The axial shaft bearing may contact an axial end of the shaft. The axial end of the shaft that can contact the axial shaft bearing may be opposite the axial end of the shaft facing the drive. The axial shaft bearing may be essentially disc-shaped or cylindrical. The axial shaft bearing may have a recess. The axial end of the shaft may be supported in the recess. The axial shaft bearing may be located in the housing. The axial shaft bearing may comprise or be made of metal or plastic.

[0067] The use of the bearing sleeve, shaft seal, and axial shaft bearing ensures secure shaft mounting and tightly seals any spaces within the housing. This minimizes or prevents the ingress of unwanted substances into the mixing chamber.

[0068] The shaft can be connected to the drive via a coupling. This connection can be detachable. Alternatively, the shaft can be connected to the drive without a coupling. For example, the shaft can be connected directly (without any intermediate elements) to the mixing element. The shaft can be a drive shaft for the drive. If the drive shaft is connected directly to the mixing element, a bearing sleeve may not be required; that is, in this case, the bearing sleeve can be omitted.

[0069] The housing can include an (additional) chamber. This chamber can be located between the drive and the mixing chamber. Preferably, the chamber is located between the bearing sleeve and the shaft seal. The shaft can extend through the chamber. This chamber can have a larger volume than the mixing chamber.

[0070] The mixing device can include at least one purge channel with an outlet. The chamber can be fluid-communicating with the purge channel via the outlet. The mixing device can include at least one further purge channel with an inlet. The chamber can be fluid-communicating with the further purge channel via the inlet. A purge fluid can be introduced into the chamber through the purge channel to purge it. The purge fluid can be discharged from the chamber via the further purge channel. The purge fluid can be a gas or a liquid, or consist of both. Preferably, the purge fluid is a liquid, for example, a solvent.

[0071] The rinsing fluid can also be introduced into the mixing chamber or the chamber into the mixing device via one of the supply channels or one of the discharge channels.

[0072] It is possible that a small amount of one or more fluids from the mixing chamber may enter the housing, particularly a section of the shaft. If other fluids are to be mixed in the mixing chamber, (minor) contamination of the mixing chamber by previously used fluids may occur. Therefore, if the fluids to be mixed in the mixing chamber are changed or a new batch of fluids is introduced, the housing, or any chambers within it, can be flushed to minimize or prevent contamination of the mixing chamber with fluids from the previous mixing operation.

[0073] The chamber can be designed as a barrier seal chamber. This barrier seal chamber can, for example, prevent air from entering the mixing chamber via the shaft seal when dealing with oxygen- and / or moisture-sensitive media or fluids, or substances contained in fluids. It can also extend the seal's service life and increase process reliability. Similarly, the barrier seal chamber can reduce or prevent the escape of fluids or media being mixed from the mixing chamber.

[0074] The barrier seal chamber can be formed between the bearing sleeve and the shaft seal. Alternatively, a further shaft seal can be provided. This further shaft seal can be designed identically to the shaft seal described in more detail. The barrier seal chamber can be formed between the shaft seal and the further shaft seal.

[0075] The mixing device can comprise at least one barrier sealing channel with an outlet. The chamber, acting as the barrier sealing chamber, can be fluid-communicating with the barrier sealing channel via the outlet. The mixing device can comprise at least one further barrier sealing channel with an inlet. The chamber (barrier sealing chamber) can be fluid-communicating with the further barrier sealing channel via the inlet. A barrier fluid can be introduced into the chamber through the barrier sealing channel to enable a barrier sealing function. The barrier fluid can be discharged from the chamber via the further barrier sealing channel. The barrier fluid can be a gas or a liquid, or consist of both. Preferably, the barrier fluid is a liquid. The barrier fluid can have a low solubility in air or oxygen. This solubility can be lower than the solubility of air or oxygen in water.

[0076] The housing can comprise at least one first housing part and one second housing part. The first housing part can be detachably connected to the second housing part. The first housing part and / or the second housing part can be formed in one piece. The first housing part can comprise or consist of metal, plastic, or ceramic. The second housing part can comprise or consist of metal, plastic, or ceramic. The housing can comprise more than two housing parts.

[0077] The first housing part can contain at least one or more of the following elements: the mixing chamber, the first feed channel, the second feed channel, and the discharge channel. Preferably, the mixing chamber, the first feed channel, the second feed channel, and the discharge channel are at least partially formed in the first housing part. "At least partially formed" can mean that at least one wall of the respective element is formed, defined, or fixed by the first housing part.

[0078] The axial shaft bearing and / or the mixing element can be arranged at least partially, in particular completely, in the first housing part.

[0079] In the second housing part, one or more of the following elements can be at least partially formed: the chamber, the flushing channel, the further flushing channel, the barrier seal channel, and the further barrier seal channel. Preferably, the chamber, the flushing channel, and the further flushing channel are at least partially formed in the second housing part. Equally preferably, the chamber, the barrier seal channel, and the further barrier seal channel are at least partially formed in the second housing part. "At least partially formed" can again mean that at least one wall of the respective element is formed, defined, or fixed by the second housing part.

[0080] The bearing sleeve, the shaft seal and / or the additional shaft seal can be arranged at least partially, in particular completely, in the second housing part.

[0081] The shaft is preferably arranged partially in the first housing part and partially in the second housing part. That is, a portion of the shaft is preferably arranged in both the first and the second housing part. The axial length of the section of the shaft arranged in the second housing part can be twice, three times, five times, seven times, or ten times the axial length of the section of the shaft arranged in the first housing part. The shaft can extend completely through the second housing part. The shaft can extend only partially, or at most partially, into the first housing part.

[0082] The mixing chamber can have a mixing chamber base and a mixing chamber side wall. The mixing chamber base can be oriented non-parallel to the axis, in particular substantially perpendicular to it. The mixing chamber side wall can adjoin the mixing chamber base. The first outlet of the first feed channel, the second outlet of the second feed channel, and / or the inlet of the discharge channel can be formed at least partially in the mixing chamber side wall.

[0083] The mixing device may include a temperature control element. The temperature control element may be configured to change the temperature in the mixing chamber. For example, the temperature in the mixing chamber may be increased or decreased by the temperature control element, particularly relative to the ambient temperature. The temperature control element may be a heating element and / or a cooling element. In particular, the temperature control element may be a Peltier element, a resistive heating element, or an inductive heating element.

[0084] The temperature control element can be located near the mixing chamber. For example, the distance between the mixing chamber and the temperature control element is at most 50 mm, preferably at most 25 mm, preferably at most 10 mm, and preferably at most 5 mm.

[0085] The mixing device allows for dynamically adjustable mixing performance, a small empty and dead volume, an (extremely) short residence time in the mixer for the media or fluids to be mixed, and / or a meeting of the media or fluids (only) directly in the mixing chamber, especially without a pre-connected static mixer (e.g., T- or Y-mixer).

[0086] The mixing device also allows for fluid connections adaptable to the mixing task (any number, shape, orientation and position, flushing function, barrier sealing function), flushing of dead volume, especially between bearing and seal, for good cleanability and prevention of cross-contamination with flushing connections as well as increased reusability, a barrier sealing function for oxygen and / or moisture-sensitive media or for a longer seal service life and process reliability, interchangeability of individual components (different mixing chamber designs and mixing element designs) and / or sustainability through disassembly / reassembly for cleaning the media-contacting components.

[0087] Brief description of the drawings: The invention is described in detail below with reference to the figures. None of the described features or elements are essential; rather, the features and elements are optional. Individual features or elements of the described examples can be combined with other features or elements.

[0088] Fig. 1 shows a section of a mixing device 100 in a schematic representation

[0089] Sectional view;

[0090] Fig. 2 shows a section of a mixing device 100 in a schematic representation

[0091] Sectional view;

[0092] Fig. 3a shows a section of a mixing device 100 in a schematic representation

[0093] Sectional view;

[0094] Fig. 3b shows an enlarged section of a mixing chamber 10 in a schematic sectional view;

[0095] Fig. 4a shows a section of a mixing device 100 in a schematic sectional view;

[0096] Fig. 4b shows a section of a mixing device 100 in a schematic sectional view;

[0097] Fig. 4c shows a section of a mixing device 100 in a schematic sectional view;

[0098] Fig. 5a schematically shows a geometry of a mixing chamber 10;

[0099] Fig. 5b schematically shows a geometry of a mixing chamber 10;

[0100] Fig. 5c schematically shows a geometry of a mixing chamber 10;

[0101] Fig. 5d schematically shows a geometry of a mixing chamber 10;

[0102] Fig. 6a schematically shows an embodiment of a mixing element 15;

[0103] Fig. 6b schematically shows an embodiment of a mixing element 15;

[0104] Fig. 6c schematically shows an embodiment of a mixing element 15;

[0105] Fig. 6d shows a schematic embodiment of a mixing element 15;

[0106] Fig. 6e schematically shows an embodiment of a mixing element 15;

[0107] Fig. 6f schematically shows an embodiment of a mixing element 15;

[0108] Fig. 6g schematically shows an embodiment of a mixing element 15;

[0109] Fig. 6h schematically shows an embodiment of a mixing element 15; and

[0110] Fig. 6i schematically shows an embodiment of a mixing element 15. Detailed description of the drawings

[0111] Fig. 1 shows a section of a mixing device 100 in a schematic sectional view. The plane shown in Fig. 1 can be defined by a radial direction r and a circumferential direction cp. A direction z can be oriented perpendicular to the r-cp plane (see, among others, Fig. 2). The intersection of r and cp can lie at the center of the shaft 70, and the z-direction can follow the axial extent of the shaft 70.

[0112] The mixing device 100 comprises a mixing chamber 10. A mixing element 15 is arranged in the mixing chamber 10. The mixing element 15 can be connected to a shaft 70. The shaft 70 can be driven by a drive 50. By rotating the shaft 70, the mixing element 15 can rotate in the mixing chamber 10.

[0113] The mixing chamber 10 is fluid-communicating with a first feed channel 20. The first feed channel 20 has a first outlet 20a. The first outlet 20a can also be considered the first inlet of the mixing chamber 10. The first feed channel 20 can be fluid-communicating with a first port 20b. A container with a first fluid can be connected to the first port 20b, so that the first fluid can flow through the first feed channel 20 from the first outlet 20a into the mixing chamber 10 via the first port 20b.

[0114] The mixing chamber 10 is connected via fluid communication to a second feed channel 21. The second feed channel 21 has a second outlet 21a. The second outlet 21a can also be considered the second inlet of the mixing chamber 10. The second feed channel 21 can be connected via fluid communication to a second port 21b. A container with a second fluid can be connected to the second port 21b, so that the second fluid can flow through the second feed channel 21 from the second outlet 21a into the mixing chamber 10 via the second port 21b.

[0115] The first fluid that can flow into the mixing chamber 10 via the first feed channel 20 can be a liquid containing a first substance or reactant. The second fluid that can flow into the mixing chamber 10 via the second feed channel 21 can be a liquid containing a second substance or reactant. The first and second fluids can be mixed in the mixing chamber 10. The mixing can be intensified, controlled, or monitored by moving the mixing element 15.

[0116] When the substances or reactants of the fluids in mixing chamber 10 come into contact, a physical or chemical process can occur between them. For example, the substances or reactants can react chemically with each other. Likewise, fluids can (physically) form a dispersion, or substances within the fluids can (chemically) react with each other.

[0117] The respective pressure of the first fluid and the second fluid can be higher in the respective feed channel than the pressure in the mixing chamber 10. The volume flow of the fluids into the mixing chamber can be controlled by a respective valve or a volume or mass flow control device.

[0118] The mixture in the mixing chamber 10 can flow into a discharge channel 30 that is fluidly connected to the mixing chamber 10. The discharge channel 30 can have an inlet 30a for this purpose. The inlet 30a can also be understood as the outlet of the mixing chamber 10. The mixture can flow from the mixing chamber 10 into the discharge channel 30 via the inlet 30a. The discharge channel 30 can be fluidly connected to a port 30b. The port 30b can be connected to a container. The mixture can be collected in the container.

[0119] The volume of the mixing chamber 10 is preferably at most 5000 pl. This allows mixing tasks with very small volumes of the fluids to be mixed to be carried out in the mixing device 100.

[0120] The first outlet 20a of the first feed channel 20 and the second outlet 21a of the second feed channel 21 can be spaced apart. Preferably, the first outlet 20a and the second outlet 21a are spaced apart such that the first fluid from the first feed channel 20 and the second fluid from the second feed channel 21 first come into contact within the mixing chamber 10. In other words, contact between the first fluid from the first feed channel 20 and the second fluid from the second feed channel 21 does not occur (in the flow direction) upstream of the mixing chamber 10. This enables a defined and controlled mixing of the fluids. In particular, it avoids the difficult-to-control mixing of the fluids without an active mixing element, e.g., in a static mixer (T-mixer or Y-mixer) upstream of the mixing chamber.

[0121] The distance between the first outlet 20a of the first feed channel 20 and the second outlet 21a of the second feed channel 21 can be at least 100 pm. Generally, this distance can be understood as the shortest distance between the first outlet 20a and the second outlet 21a. There need not be a distance between the first outlet 20a of the first feed channel 20 and the second outlet 21a of the second feed channel 21.

[0122] The first feed channel 20 and the second feed channel 21 can be spaced at least 15.0 mm apart from the mixing chamber 10. At a smaller distance from the mixing chamber 10, the first feed channel 20 and the second feed channel 21 can be fluidically connected. The first outlet 20a and the second outlet 21a can overlap in a wall of the mixing chamber 10.

[0123] Fig. 2 shows a section of a mixing device 100 in a schematic sectional view. In Fig. 2, an rz-plane is shown.

[0124] The mixing device 100 can comprise a first housing part 41 and a second housing part 42. The first housing part 41 can be connected to the second housing part 42, in particular detachably connected. A seal, for example an O-ring, can be arranged between the first housing part 41 and the second housing part 42.

[0125] The mixing device may include a drive 50. The drive 50 may be configured to drive the mixing element 15 in the mixing chamber 10. In particular, the drive 50 is configured to rotate the mixing element 15 in the mixing chamber. The drive 50 may include an electric motor or be an electric motor. The drive 50 and the mixing element 15 may be coupled to each other via a shaft 70. The shaft 70 may be a drive shaft of the drive 50. Alternatively, the shaft may be connected to the drive 50 via a coupling. An axis A may be defined by an axis of rotation of the shaft 70 and / or by an axis of rotation of the mixing element 15.

[0126] The mixing device 100 can include a bearing sleeve 71. The bearing sleeve 71 can support the shaft 70. In particular, the bearing sleeve 71 has a recess. The shaft 70 can be guided through the recess.

[0127] The mixing device 100 can include an axial shaft bearing 73. The axial shaft bearing 73 can contact an axial end of the shaft 70. In particular, the axial shaft bearing 73 is arranged in a recess in the first housing part 41.

[0128] The mixing device 100 can include a shaft seal 72. The shaft seal 72 can have a recess. The shaft 70 can protrude through the recess. The mixing chamber 10 can be sealed against the drive 50 by means of the shaft seal 72.

[0129] The shaft 70 can protrude through the bearing sleeve 71 and be supported radially. The axial shaft bearing 73 allows the shaft 70 to be supported axially. Additionally, the shaft 70 can protrude through the shaft seal 72.

[0130] Fig. 3a shows a section of a mixing device 100 in a schematic sectional view. This section of the mixing device 100 is identical to the section of the mixing device 100 shown in Fig. 2. Fig. 3a again depicts an rz-plane.

[0131] The mixing device 100 comprises a mixing chamber 10. The mixing chamber 10 can be formed at least partially within the first housing section 41. The mixing chamber 10 can be partially defined by the bearing sleeve 71 and / or by the second housing section 42.

[0132] The mixing chamber 10 is fluid-communicating with the first feed channel 20 and with the second feed channel 21. This can be achieved via the first outlet 20a or the second outlet 21a. The first feed channel 20 can be formed at least partially within the first housing part 41. The first feed channel 20 can also be partially defined by the second housing part 42 and / or the bearing sleeve 71. The second feed channel 21 can also be formed at least partially within the first housing part 41. Alternatively, the second feed channel 21 can be partially defined by the second housing part 42 and / or the bearing sleeve 71.

[0133] The first feed channel 20 can be fluid-communicating with a first port 20b. The first port 20b can be at least partially formed in the first housing part 41. The first port 20b can be partially defined by the second housing part 42.

[0134] The second feed channel 21 can be fluid-communicating with a second port 21b. The second port 21b can be at least partially formed in the first housing part 41. The second port 21b can also be partially defined by the second housing part 42.

[0135] The discharge channel 30 is not shown in Fig. 3a. The discharge channel 30 is fluidly connected to the mixing chamber 10. This connection can be realized through an inlet 30a of the discharge channel 30. The discharge channel 30 can be formed at least partially within the first housing part 41. The discharge channel 30 can also be partially defined by the second housing part 42 and / or the bearing sleeve 71.

[0136] The discharge channel 30 can be fluid-communicating with a port 30b. The port 30b can be at least partially formed in the first housing part 41. The port 30b can be partially defined by the second housing part 42.

[0137] The bearing sleeve 71 is preferably (completely) surrounded by the second housing part 42. The first housing part 41 may not surround the bearing sleeve 71.

[0138] The shaft seal 72 is preferably (completely) surrounded by the second housing part 42.

[0139] The first housing part 41 cannot surround the shaft seal 72. A chamber 65 can be formed between the bearing sleeve 71 and the drive 50. Preferably, the chamber 65 is formed between the bearing sleeve 71 and the shaft seal 72. The shaft 70 can project through the chamber 65. The chamber can be (completely) surrounded by the second housing part 42. The first housing part 41 cannot surround the chamber 65.

[0140] The chamber 65 can be fluid-communicating with a flushing channel 60. The connection can be made via an outlet 60a of the flushing channel 60. The flushing channel 60 can be (completely) formed within the second housing part 42. The first housing part 41 does not necessarily surround the flushing channel 60.

[0141] The flushing channel 60 can be fluid-communicating with a port 60b. The port 60b can be (completely) formed in the second housing part 42. The first housing part 41 does not surround the port 60b.

[0142] Chamber 65 can be fluid-communicating with a further flushing channel 61. The connection can be made via a further outlet 61a of the further flushing channel 61. The further flushing channel 61 can be (completely) formed in the second housing part 42. The first housing part 41 does not surround the further flushing channel 61.

[0143] The additional flushing channel 61 can be fluid-communicating with a further connection 61b. The further connection 61b can be (completely) formed in the second housing part 42. The first housing part 41 does not surround the further connection 61b.

[0144] Chamber 65 can be rinsed via the rinsing channel 60. For this purpose, a rinsing fluid can be introduced into chamber 65 via the rinsing channel 60. The rinsing fluid can then flow from chamber 65 into the further rinsing channel 61. This allows the chamber to be rinsed and reduces or prevents cross-contamination in the mixing device 100.

[0145] Chamber 65 can have a barrier sealing function. In particular, chamber 65 is a barrier sealing chamber. A fluid, especially a barrier fluid, can be introduced into chamber 65. This reduces or prevents the entry of substances from the ambient air into the mixing chamber, and allows oxygen- and / or moisture-sensitive fluids to be mixed in the mixing chamber.

[0146] The shaft 70 can (completely) extend through the second housing part 42. The shaft 70 can (only or at most) partially extend into the first housing part 41.

[0147] Fig. 3b shows an enlarged section of a mixing chamber 10 in a schematic sectional view. The plane shown in Fig. 3b is an rz plane.

[0148] The mixing chamber 10 can have a mixing chamber base 10a. The mixing chamber base 10a can be formed by the first housing part 41 and / or the second housing part 42. Likewise, the mixing chamber base 10a can be formed by the bearing sleeve 71.

[0149] The mixing chamber base 10a can be oriented non-parallel to axis A. Axis A can be defined by an axis of rotation of the shaft 70 or by an axis of rotation of the mixing element 15. In particular, the mixing chamber base 10a is oriented perpendicular to axis A at ±45°, preferably perpendicular at ±30°, preferably perpendicular at ±20°, preferably perpendicular at ±10°, preferably perpendicular at ±5°.

[0150] A mixing chamber side wall 10b can be attached to the mixing chamber base 10a. The mixing chamber side wall 10b is preferably oriented parallel to axis A at ±45°, preferably parallel to axis A at ±30°, preferably parallel to axis A at ±20°, preferably parallel to axis A at ±10°, preferably parallel to axis A at ±5°.

[0151] The mixing chamber side wall 10b can be (completely) formed by the first housing part 41.

[0152] A mixing chamber roof 10c can be attached to the mixing chamber side wall 10b. The mixing chamber roof 10c can be oriented non-parallel to the axis A. In particular, the mixing chamber roof 10c is oriented perpendicularly ±45°, preferably perpendicularly ±30°, preferably perpendicularly ±20°, preferably perpendicularly ±10°, preferably perpendicularly ±5° to the axis A. The mixing chamber roof 10c can be oriented parallel to the mixing chamber floor 10a. The mixing chamber roof 10c can be (completely) formed by the axial shaft bearing 73 and / or the first housing part 41.

[0153] The mixing chamber 10 can be formed or defined by the mixing chamber floor 10a, the mixing chamber side wall 10b and the mixing chamber ceiling 10c.

[0154] The first outlet 20a of the first feed channel 20 is preferably formed at least partially in the mixing chamber side wall 10b. Preferably, the first outlet 20a of the first feed channel 20 is formed completely in the mixing chamber side wall 10b.

[0155] The second outlet 21a of the second feed channel 21 is preferably formed at least partially in the mixing chamber side wall 10b. Preferably, the second outlet 21a of the second feed channel 21 is formed completely in the mixing chamber side wall 10b.

[0156] The inlet 30a of the discharge channel 30 is preferably formed at least partially in the mixing chamber side wall 10b. Preferably, the inlet 30a of the discharge channel 30 is formed completely in the mixing chamber side wall 10b.

[0157] Fig. 4a shows a section of a mixing device 100 in a schematic sectional view. The plane shown in Fig. 4a is an r-cp plane.

[0158] The mixing device 100 comprises a first feed channel 20 with a first outlet 20a and a first connection 20b, and a second feed channel 21 with a second outlet 21a and a second connection 21b, similar to that described with reference to Fig. 1. Likewise, the mixing device 100 comprises at least one discharge channel 30 with an inlet 30a and a connection 30b, again similar to the mixing device 100 described with reference to Fig. 1.

[0159] The mixing device 100 can have further feed channels and / or discharge channels. In the example of Fig. 4a, the mixing device 100 comprises a third feed channel 22 with a third outlet 22a and a third port 22b, a fourth feed channel 23 with a fourth outlet 23a and a fourth port 23b, a fifth feed channel 24 with a fifth outlet 24a and a fifth port 24b, and a sixth feed channel 25 with a sixth outlet 25a and a sixth port 25b.

[0160] Each of the supply channels 22, 23, 24, 25 can be fluid-communicating with the mixing chamber 10 via a corresponding outlet 22a, 23a, 24a, 25a. Each of the supply channels 22, 23, 24, 25 can also be fluid-communicating with a corresponding port 22b, 23b, 24b, 25b.

[0161] The disclosure is not limited to the number of feed and discharge channels shown as an example. Rather, the mixing device 100 can comprise at least two feed channels and at least one discharge channel. In particular, the mixing device 100 comprises at least three, preferably at least four, preferably at least five, preferably at least six, feed channels. The mixing device 100 can comprise at least two, preferably at least three, preferably at least four, preferably at least five, discharge channels.

[0162] The discharge and feed channels 20, 21, 22, 23, 24, 25, 30 can be (completely) oriented or formed in a plane. The plane can be essentially (±30°, ±20°, ±10° or ±5°) perpendicular to axis A.

[0163] The discharge and supply channels 20, 21, 22, 23, 24, 25, 30 can be arranged in a circumferential direction cp around the axis A in a uniformly or unevenly distributed manner.

[0164] All discharge and feed channels 20, 21, 22, 23, 24, 25, 30 can be formed in the first housing part 41.

[0165] Each channel axis of the discharge and supply channels 20, 21, 22, 23, 24, 25, 30 can be determined by the center points of the respective channel along the flow direction (by the center points of the cross-section perpendicular to the flow direction).

[0166] The angle between any two adjacent channel axes can be at least 5°, preferably at least 10°, preferably at least 15°, preferably at least 20°, preferably at least 25°, preferably at least 30°, preferably at least 35°, preferably at least 40°, preferably at least 45°, preferably at least 50°, preferably at least 60°, preferably at least 70°, preferably at least 80°, preferably at least 90°.

[0167] The angle between any two adjacent channel axes can be at most 90°, preferably at most 80°, preferably at most 70°, preferably at most 60°, preferably at most 50°, preferably at most 45°, preferably at most 40°, preferably at most 35°, preferably at most 30°, preferably at most 25°, preferably at most 20°, preferably at most 15°, preferably at most 10°, preferably at most 5°.

[0168] Fig. 4b shows a section of a mixing device 100 in a schematic sectional view.

[0169] In the embodiment shown in Fig. 4b, the mixing device 100 comprises a first feed channel 20 with a first connection 20b and a second feed channel 21 with a second connection 21b. The mixing device 100 also comprises a discharge channel 30 with a connection 30b.

[0170] A first feed channel axis can be defined by the center points of the first feed channel along the flow direction (by the center points of the cross-section perpendicular to the flow direction). A second feed channel axis can be defined by the center points of the second feed channel (by the center points of the cross-section perpendicular to the flow direction). A discharge channel axis can be defined by the center points of the discharge channel (by the center points of the cross-section perpendicular to the flow direction).

[0171] Two of the axes of the first feed channel, the second feed channel, and the discharge channel can lie in the same plane. The remaining axis of the first feed channel, the second feed channel, and the discharge channel can be at an angle to the plane. Preferably, the remaining axis of the first feed channel, the second feed channel, and the discharge channel is oriented substantially (±30°, ±20°, ±10°, or ±5°) perpendicular to the plane.

[0172] At least one of the first feed channel axes, the second feed channel axes, and the discharge channel axes can be oriented essentially (±30°, ±20°, ±10°, or ±5°) parallel to axis A. At least one of the first feed channel axes, the second feed channel axes, and the discharge channel axes can be oriented essentially (±30°, ±20°, ±10°, or ±5°) perpendicular to axis A.

[0173] Fig. 4c shows a section of a mixing device 100 in a schematic sectional view.

[0174] In the embodiment shown in Fig. 4c, the mixing device 100 comprises a first feed channel 20 with a first connection 20b and a second feed channel 21 with a second connection 21b. The mixing device 100 also comprises a first discharge channel 30 with a first connection 30b and a second discharge channel with a second connection 31b.

[0175] A first feed channel axis can be defined by the center points of the first feed channel along the flow direction (by the center points of the cross-section perpendicular to the flow direction). A second feed channel axis can be defined by the center points of the second feed channel (by the center points of the cross-section perpendicular to the flow direction). A first discharge channel axis can be defined by the center points of the first discharge channel (by the center points of the cross-section perpendicular to the flow direction). A second discharge channel axis can be defined by the center points of the second discharge channel (by the center points of the cross-section perpendicular to the flow direction).

[0176] Two of the axes of the first feed channel, the second feed channel, the first discharge channel, and the second discharge channel can lie in a plane. At least one of the remaining axes of the first feed channel, the second feed channel, the first discharge channel, and the second discharge channel can be angled relative to the plane. Preferably, the at least one remaining axe of the first feed channel, the second feed channel, the first discharge channel, and the second discharge channel is oriented at an angle of 45° ±30°, preferably 45° ±20°, preferably 45° ±10°, and preferably 45° ±5° to the plane.

[0177] At least one of the first feed channel axis, the second feed channel axis, the first discharge channel axis, and the second discharge channel axis can be oriented substantially (±30°, ±20°, ±10°, or ±5°) perpendicular to axis A. At least one of the first feed channel axis, the second feed channel axis, the first discharge channel axis, and the second discharge channel axis can have an angle of 45° ±30°, preferably 45° ±20°, preferably 45° ±10°, and preferably 45° ±5°, to axis A.

[0178] In general, each of the connections can be used both for supplying fluid to mixing chamber 10 and for discharging fluid or a mixture of fluids from mixing chamber 10. That is, every supply channel can be a discharge channel and every discharge channel can be a supply channel. The flow direction of fluid in the supply and discharge channels can be selected, among other things, by choosing the pressures at the connections. The terms "supply channel" and "discharge channel" are examples and do not necessarily define a flow direction. However, defining the flow direction using the terms "supply channel" and "discharge channel" is possible.

[0179] Figures 5a to 5d schematically depict various embodiments of the geometries of the mixing chamber 10. The mixing element 15 is shown schematically in each mixing chamber 10. The planes shown in Figures 5a to 5d are r-cp planes.

[0180] The mixing chamber 10 can be essentially cylindrical. Likewise, the mixing chamber 10 can be conical, spherical, or elliptical in cross-section.

[0181] The cross-section of the mixing chamber 10 can be constant or varying along axis A.

[0182] In the embodiment shown in Fig. 5a, the mixing chamber wall 10b has an elliptical cross-section (perpendicular to axis A). Alternatively, the mixing chamber wall 10b can have a circular cross-section.

[0183] Fig. 5b shows an embodiment of the mixing chamber 10 in which the mixing chamber wall 10b is egg-shaped.

[0184] In the embodiment shown in Fig. 5c, the mixing chamber wall has an elliptical cross-section (perpendicular to axis A), with a greater deviation from a circular cross-section than in the embodiment shown in Fig. 5a. Fig. 5d shows several, i.e., at least two, at least three, at least four, or at least five, protrusions 10ha in the mixing chamber wall 10b. The protrusions can be arranged uniformly or unevenly distributed in the circumferential direction cp.

[0185] Figures 6a to 6i schematically illustrate various embodiments of geometries of the mixing element 15.

[0186] In general, the cross-section of the mixing element 15 can be constant or varying along axis A.

[0187] In the embodiment shown in Fig. 6a, the mixing element 15, or rather its outer wall, has a hypocycloid shape in cross-section (perpendicular to axis A). This hypocycloid shape forms several arms 18, i.e., at least two, preferably at least three, preferably at least four, preferably at least five, preferably at least six. The shape of the mixing element 15 in this embodiment resembles that of a gear.

[0188] In the embodiment shown in Fig. 6b, the mixing element 15, or the outer wall of the mixing element 15, has at least two, preferably exactly two, arms 18 in cross-section (perpendicular to axis A). The arms 18 can extend radially outwards from a central section 17. The central section 17 can have a substantially circular cross-section. The two arms 18 can be aligned. The arms 18 can have a rectangular cross-section (perpendicular to the radial direction of extension). The arms 18 can extend over the entire height of the mixing element 15 along axis A.

[0189] In the embodiment shown in Fig. 6c, the mixing element 15, or the outer wall of the mixing element 15, has at least four, preferably exactly four, arms 18 in cross-section (perpendicular to axis A). The arms 18 can extend radially outwards from a central section 17. The central section 17 can have a substantially circular cross-section. Two of the arms 18 can be arranged in alignment. The arms 18 can have a rectangular cross-section (perpendicular to the radial direction of extension). The arms 18 can extend over the entire height of the mixing element 15 along axis A.

[0190] In the embodiment shown only partially in Fig. 6d, the mixing element 15, or rather the outer wall of the mixing element 15, has a disc-shaped section 18a. The disc-shaped section 18a may have a central recess through which the shaft 70 can project. Extending from the disc-shaped section 18, several, i.e., at least three, preferably at least five, more preferably at least ten, beams 18b may extend in a first direction along the axis A. Likewise, extending from the disc-shaped section 18, several, i.e., at least three, preferably at least five, more preferably at least ten, beams 18c may extend in a second direction along the axis A. The first direction and the second direction may be opposite directions. The beams 18b extending in the first direction and the beams 18c extending in the second direction may be aligned along the axis A.The beams 18b, extending in the first direction, and the beams 18c, extending in the second direction, can extend radially (perpendicular to axis A) to the radial end of the disk-shaped section 18a. The beams 18b, extending in the first direction, and the beams 18c, extending in the second direction, can terminate radially with the radial end of the disk-shaped section 18a.

[0191] In the embodiment shown in Fig. 6e, the mixing element 15, or rather the outer wall of the mixing element 15, has a disc-shaped section 18a. The disc-shaped section 18a may have a central recess through which the shaft 70 can project. Several, i.e., at least three, preferably at least five, more preferably at least ten, blade elements 18d can extend along the axis A from the disc-shaped section 18a. The blade elements 18d can project beyond the disc-shaped section 18a along the axis A. The blade elements 18d can project radially (perpendicular to the axis A) beyond the disc-shaped section 18a. The blade elements 18d can have a constant cross-section along the axis A.

[0192] In the embodiment of Fig. 6f, the mixing element 15, or the outer wall of the mixing element 15, has several, i.e., at least three, preferably at least five, more preferably at least ten, paddle elements 18d. The paddle elements 18d can extend radially outwards (perpendicular to axis A) from a central section of the mixing element 15. Preferably, the paddle elements 18d are inclined in the circumferential direction. The paddle elements 18d do not have a constant cross-section along axis A; i.e., the cross-section of the paddle elements 18d can vary along axis A.

[0193] In the embodiment of Fig. 6g, the mixing element 15, or the outer wall of the mixing element 15, has a disc-shaped section 18a. The disc-shaped section 18a may have a central recess through which the shaft 70 can project. Several, i.e., at least three, preferably at least five, more preferably at least ten, vane elements 18d can extend along the axis A from the disc-shaped section 18. The vane elements 18d can extend from the disc-shaped section 18 only, or at most, in one direction along the axis A. One side of the disc-shaped section 18a can be substantially smooth. The vane elements 18d can extend radially (perpendicular to the axis A) to the radial end of the disc-shaped section 18a. The vane elements 18d can terminate radially with the radial end of the disc-shaped section 18a.

[0194] In the embodiment shown in Fig. 6h, the mixing element 15, or the outer wall of the mixing element 15, has a central section 17. The central section 17 can have a substantially circular cross-section. At least two arms 18ea can extend radially outwards from the central section 17. The two arms 18ea can be aligned. At least two further arms 18eb can extend radially outwards from the central section 17. The two further arms 18ea can be aligned. The arms 18ea and the arms 18eb need not extend over the entire height of the mixing element along axis A. The arms 18ea and the arms 18eb can be arranged at different height positions of the central section 17 along axis A. The arms 18ea and the arms 18eb can have a rectangular cross-section in the radial direction (perpendicular to axis A).

[0195] In the embodiment of Fig. 6i, the mixing element 15 or the outer wall of the mixing element 15 has a central section 17. The central section 17 can be substantially circular in cross-section. At least two, preferably at least three, arms 18ea can extend radially outwards from the central section 17. The arms 18ea can be arranged evenly spaced in the circumferential direction. At least two, preferably at least three, further arms 18eb can extend radially outwards from the central section 17. The arms 18ea can be arranged in the circumferential direction

[0196] The arms 18ea and 18eb must be arranged in a uniformly distributed direction. They cannot extend over the entire height of the mixing element along axis A. The arms 18ea and 18eb can be arranged at different height positions of the central section 17 along axis A. The cross-section of the arms 18ea and 18eb can be a circular area in the radial direction (perpendicular to axis A).

Claims

Patent claims 1. Mixing device (100), comprising the mixing device (100): - a case (41, 42); - at least a first feed channel (20) with a first outlet (20a), a second feed channel (21) with a second outlet (21a) and a discharge channel (30) with an inlet (30a); - a mixing chamber (10) in the housing (41, 42), wherein the mixing chamber (10) is fluidly connected to the first supply channel (20) via the first outlet (20a), to the second supply channel (21) via the second outlet (21a), and to the discharge channel (30) via the inlet (30a), and wherein the mixing chamber (10) has a volume of at most 5000 gl; and - a mixing element (15) arranged in the mixing chamber (10) and configured to mix a first fluid from the first supply channel (20) and a second fluid from the second supply channel (20) into a mixture, wherein the mixture can be discharged into the discharge channel (30); - where: (I) the first outlet (20a) and the second outlet (21a) are spaced apart from each other; and / or (II) the first feed channel (20) and the second feed channel (21) are spaced apart from each other at a distance of at least 15.0 mm from the mixing chamber (10).

2. Mixing device according to claim 1, wherein the first outlet (20a) and the second outlet (21a) are spaced apart by at least 100 pm, preferably at least 250 pm, preferably at least 500 pm, preferably at least 750 pm, preferably at least 1000 pm.

3. Mixing device according to one of the preceding claims, wherein the mixing chamber (10) has a volume of at most 2500 pl, preferably at most 1000 pl, preferably at most 500 pl, preferably at most 150 pl, preferably at most 75 pl, preferably at most 30 pl, preferably at most 10 pl.

4. Mixing device according to one of the preceding claims, wherein the mixing device (100) comprises a drive (50) and the drive (50) is configured to move the mixing element (15) to mix the first fluid and the second fluid.

5. Mixing device according to one of the preceding claims, wherein the mixing device (100) comprises a shaft (70), wherein the shaft (70) is connected to a drive (50) and the mixing element (15) such that a force can be transmitted from the drive (50) to the mixing element (15), in particular wherein the mixing device (100) comprises a bearing sleeve (71), a shaft seal (72) and / or an axial shaft bearing (73).

6. Mixing device according to one of the preceding claims, wherein the housing (41, 42) comprises a chamber (65).

7. Mixing device according to claim 6, wherein the mixing device (100) comprises at least one flushing channel (60) with an outlet (60a) and the chamber (65) is fluidly connected to the flushing channel (60) via the outlet (60a).

8. Mixing device according to claim 6, wherein the chamber (65) is designed as a barrier sealing chamber.

9. Mixing device according to one of the preceding claims, wherein the housing (41, 42) comprises at least a first housing part (41) and a second housing part (42) and the first housing part (41) is detachably connected to the second housing part (42), in particular wherein the mixing chamber (10), the first feed channel (20), the second feed channel (21) and / or the discharge channel (30) are at least partially formed in the first housing part (41).

10. Mixing device according to one of the preceding claims, wherein the center of the mixing element (15) is not permeable to the first and / or second fluid.

11. Mixing device according to one of the preceding claims, wherein the mixing element (15) is fully rotatable about its axis of rotation.

12. Mixing device (100), comprising the mixing device (100): - a case (41, 42); - at least a first feed channel (20) with a first outlet (20a), a second feed channel (21) with a second outlet (21a) and a discharge channel (30) with an inlet (30a); - a mixing chamber (10) in the housing (41, 42), wherein the mixing chamber (10) is fluidly connected to the first supply channel (20) via the first outlet (20a), to the second supply channel (21) via the second outlet (21a), and to the discharge channel (30) via the inlet (30a), and wherein the mixing chamber (10) has a volume of at most 5000 l; and - a mixing element (15) arranged in the mixing chamber (10), rotatable about an axis (A) and configured to mix a first fluid from the first supply channel (20) and a second fluid from the second supply channel (20) into a mixture, wherein the mixture can be discharged into the discharge channel (30); - wherein the mixing chamber (10) has a mixing chamber bottom (10a) and a mixing chamber side wall (10b), wherein the mixing chamber bottom (10a) is oriented non-parallel, in particular substantially perpendicular, to the axis (A) and the mixing chamber side wall (10b) adjoins the mixing chamber bottom (10a), and wherein the first outlet (20a), the second outlet (21a) and / or the inlet (30a) is formed at least partially in the mixing chamber side wall (10b).

13. Mixing device (100), comprising the mixing device (100): - a housing (41, 42) with a first housing part (41) and a second housing part (42); - at least a first feed channel (20) with a first outlet (20a), a second feed channel (21) with a second outlet (21a) and a discharge channel (30) with an inlet (30a); - a mixing chamber (10) in the housing (41, 42), wherein the mixing chamber (10) is fluidly connected to the first supply channel (20) via the first outlet (20a), to the second supply channel (21) via the second outlet (21a) and to the discharge channel (30) via the inlet (30a), and wherein the mixing chamber (10) has a volume of at most 5000 l; and - a mixing element (15) arranged in the mixing chamber (10) and configured to mix a first fluid from the first supply channel (20) and a second fluid from the second supply channel (20) into a mixture, wherein the mixture can be discharged into the discharge channel (30); - wherein the first housing part (41) is detachably connected to the second housing part (42) and the mixing chamber (10), the first feed channel (20), the second feed channel (21) and / or the discharge channel (30) is at least partially formed in the first housing part (41).

14. Method for mixing at least two fluids in a mixing device (100) according to one of the preceding claims, the method comprising the steps: - Introducing the first fluid into the mixing chamber (10) via the first outlet (20a) of the first feed channel (20); - Introducing the second fluid into the mixing chamber (10) via the second outlet (21a) of the second supply channel (21); - Mixing the first fluid and the second fluid in the mixing chamber (10) by moving the mixing element (15) to obtain a mixture; and - Discharge of the mixture into the inlet (30a) of the discharge channel (30).

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