EP3658266A1

EP3658266A1 - Mixer having compensation duct and/or holding chamber

Info

Publication number: EP3658266A1
Application number: EP18746917.6A
Authority: EP
Inventors: Alexander Bublewitz; Jens-Peter Reber
Original assignee: 3lmed GmbH
Current assignee: 3lmed GmbH
Priority date: 2017-07-28
Filing date: 2018-07-26
Publication date: 2020-06-03
Anticipated expiration: 2038-07-26
Also published as: CN111050894A; US20200171448A1; CA3070174A1; CA3070150A1; EP3658266B1; BR112019024621A2; KR20200035096A; CA3070174C; JP7100127B2; JP6994112B2; US11717794B2; EP3658265A1; JP2020529317A; KR102431025B1; CA3070150C; CN111050893A; BR112019024617A2; WO2019020764A1; WO2019020768A1; US11986785B2

Abstract

The invention relates to a mixer having a mixer housing (13a) which encloses a mixing chamber, an input part (1) which can be connected to the mixer housing (13a) and has at least two input openings (2) for the components (A, B) to be mixed, and a mixing element (13), at least some sections of which extend into the mixing chamber, wherein each of the input openings (2) is flow-connected to the mixing chamber via at least one input duct, wherein there is also in the input part (1) at least one compensation duct (4) which connects the input openings (2) to each other, and/or at least one holding chamber (14) is provided in the mixing element (13).

Description

Mixer with compensation channel and / or stowage chamber

The present invention relates to a mixer having a mixer housing which includes a mixing space, an input part connectable to the mixer housing having at least two input ports for the components to be mixed, and a mixing element extending at least in sections into the mixing chamber, each of the input ports is in fluid communication with the mixing space via at least one inlet channel.

Generic static and dynamic mixers are used, for example, in the dental field or for building and adhesives. The mixing element of the mixer is used for the homogeneous mixture of several, usually two, viscous or pasty components, which are stored separately in a cartridge or a similar container austragbar. Typical consistencies / viscosities for dental impression materials are described in the standard DIN EN ISO 4823. By the mixing process, a reaction of the individual components is often started with each other, wherein the actual substance to be processed, for example. A dental material or a building or adhesive is formed. Depending on the composition of the components to each other and application, they are mixed in different ratios. Typical mixing ratios include 1: 10, 1: 5, 1: 4, 1: 2 and 1: 1.

Since the compositions and concentrations of the viscous / pasty components (in the following also only: components) and their mixing ratio are coordinated with each other, it is crucial that the ratio of the components to one another not only in the filling process in the cartridge, but also in the mixing process itself preserved. The filling of the components in the cartridges is technically conditioned with certain Füllhöhenschwankungen typically in the range of 5%, with higher technical complexity also 1%, of the filled volume connected. In addition, the arrangement of the respective dispensing piston is associated with certain tolerances. Therefore, it happens that one of the pistons is located further forward in Ausbringrichtung. Both the technical fluctuations in the filling height and the slightly different arrangement of the delivery piston causes one of the components to enter the mixing chamber before the other component. Furthermore, the breakaway torque of the Ausbringkol- ben, ie the initial impulse of Ausbringkolben when loosening from the storage position in Ausbringrichtung, in particular due to manufacturing variations fail, so even for a perfect filling one of the components before the other component will enter the mixing chamber. Since the components to be mixed generally have a different composition, the components also differ in their rheology and thus in their Ausbringverhalten. Since the different composition is inherently based on a multicomponent system, it is therefore also not possible, by optimizing the known constructions and the filling method, to rule out that even with 1: 1 cartridges one of the components enters the mixing chamber before the other component.

In other words, it will inevitably be observed that the one component forms a so-called feed, which enters the mixing space before the other component, so that at least the initial ratio of the components to one another deviates from the ideal mixing ratio. Such a flow often leads to this unmixed discharged from the mixer. The unmixed precursor component must be discarded because it does not have the properties of the processing material. Although the filling-related fluctuations and unevenness of the piston positioning occur with all viscous or pasty components, these are often tolerated, in particular in the case of large-volume and inexpensive components, for example sealing materials or adhesives. For small-volume and high-priced components, for example dental materials, however, these fluctuations are not acceptable since a larger proportion of the expensive material has to be discarded.

In addition, the discarding of the lead is cumbersome for a user and involves a safety risk in the application because the lead does not have the adhesive, impact and / or strength properties obtained for the mixture. Even from an optical point of view, inadvertent use of the flow can lead to undesired results.

EP 2 599 540 B1 describes a mixing element for a static mixer which reduces the flow of a component by supplying this component to the mixing element by means of an inlet channel separated from the other component. Due to the separate management of the components, a previously known flow can be compensated.

EP 2 527 029 A2 discloses a mixer with a star-like baffle plate, which has a centric pin or mandrel extending upstream into the flow of material and merges divergently in the flow direction into an axis-wise plate.

WO 2012 1 16 873 A1 also relates to the compensation of a flow. For this purpose, two delay chambers and a deflection element are provided, wherein the deflection element diverts the component flows radially inwards. Furthermore, EP 0 664 153 A1, EP 0 584 428 A1, DE 29 902 666 U1 and DE 3 606 001 A1 describe generic static mixers which relate to the above-described problem. US 2012/0 199 607 A1 discloses a discharge device with a two-component cartridge and a mixer which can be attached to it. The mixer should be easily brought to the cartridge and removed from it. DE 36 06 001 A1 describes a dosing and mixing gun for multi-component plastics. Each component is guided in the static mixing chamber via a respective supply duct provided with a throttle device.

In documents WO 2013 0 26 722 A1, EP 1 943 012 B1, DE 10 1 12 904 A1, DE 10 2004 008 748 A1, DE 299 02 666 U1, EP 2,190,563 B1, EP 1 458 467 B1 and EP 1 892 033 A1, dynamic mixers are described which are intended to compensate for a flow.

From EP 0 885 651 B1 a mixer is known having a header collecting union chamber which is provided within a mixer inlet region. In this case, the component inlet openings are subdivided by a separating rib and the travel distance of the component present in excess is extended. Essentially, the exploitation of the above-described solutions is based on the fact that a filling-related fluctuation of an excess component has a greater effect than with a component in excess. Therefore, there is only an advance of the surplus component, while a bottleneck-related fluctuation does not create a flow in the sub-existing component. Especially at Higher excesses of a component, for example. With common 1: 10 mixing ratios, it comes also to a flow of excess component, since the container receiving this component and the associated Ausbringkolben are much larger than the respective components of the present in the low component. In other words, it is inevitable in the known solutions before filling the components to know which component is present in excess and will therefore form flow. Therefore, the known solutions are applicable only for unequal mixing ratios.

At mixing ratios of 1: 1 and partly already at similar mixing ratios with small differences in volume, for example 1: 1, 25 or 1: 2, it is not possible to predict with certainty which of the components will be present in excessively high proportions and will therefore form a flow , This problem occurs with all known multi-component cartridges, in particular regardless of whether a static or a dynamic mixer is used.

It is therefore an object of the present invention to provide a mixer which receives the flow for any mixing ratios, in particular with small differences in volume, such as 1: 1 to 1: 2, in particular from both the first component and the second component can be formed.

This object is achieved with a mixer according to claim 1.

According to the invention, the mixer has a mixer housing with a mixing chamber, an input part which can be connected to the mixer housing, which has at least two inlet openings for the components to be mixed, and a mixing element, wherein the mixing element extends at least in sections into the mixing space. Each one of the passage openings via at least one inlet channel with the mixing space in flow communication. In addition, it is provided that at least one compensation channel is formed in the input part, which connects the input openings with each other. In addition or as an alternative to this, at least one storage chamber for receiving the supply is provided in the mixing element.

Through the connection of the inlet openings with a compensation channel can emerge at the inlet openings exiting flow into the compensation channel and be collected there as a flow. Since the inlet openings are connected to each other, the flow is collected independently of the component that forms the flow. In other words, the connection between the inlet openings ensures that the components enter the compensation channel through these inlet openings without having to make a preselection with regard to the flow-forming component.

The compensation channel allows self-regulation with regard to the flow, since first the compensation channel is filled by the leading component until the further component flows into the compensation channel and prevents further filling of the compensation channel by the leading component. Subsequently, both can enter the mixing chamber separately or together via the inlet channels.

In other words, the invention can be seen in that a, in particular radially open, compensation channel is provided. The Kompensati- onskanal can be formed by an outer closed ring and an inner ring with symmetrically arranged openings.

When discharging, the leading component spreads in the compensation channel until the trailing component approaches it. Depending on the flow path, a variable component front is created. The Components form a contact surface on this front. After the compensation channel has been filled, the component front remains in its position in the compensation channel, with the result that the further inflowing component mass flows by the shortest route from the inlet openings through the corresponding openings into the inlet to the mixing chamber and then axially in the discharge direction.

Likewise, the arrangement allows at least one storage chamber in the mixing element, the recording of the flow regardless of which of the components forms the flow, since the storage chamber, or the storage space is provided in the mixing element and is therefore filled by the leading component. The stowage chamber according to the invention is designed so that the flow is received and remains in the stowage chamber. The storage chamber is preferably arranged in the first third of the mixing space in the flow direction of the components.

Preferably, the storage chamber is configured such that it has closed side walls and only one opening which is formed as an inlet opening in a transverse wall. Since the stagnation chamber has only one inlet opening, but otherwise is not connected to the flow with the other chambers, the inlet entering the stagnation chamber is held there, so that it will essentially no longer participate in the further mixing process.

The mixer according to the invention may be a static mixer or a dynamic mixer.

In particular, it is advantageous according to the invention that the compensation channel is provided in the input part. Therefore, the compensation channel can be realized with any type of mixer and functions independently of the concrete design of the mixer. In a preferred variant, the internal volume of the compensation channel and / or the storage chamber is adapted to the fluctuations caused by the filling such that the fluctuations in the volume of the components are smaller than the internal volume of the compensation channel and / or the storage chamber. In other words, the internal volume of the compensation channel and / or the storage chamber corresponds to 1% to 10%, in particular 1% to 8%, particularly preferably 1% to 5%, of the volume of a component if a mixing ratio of 1: 1 is present. With mixing ratios deviating from 1: 1, the volume of the component present in larger proportions is decisive.

Alternatively or additionally, the internal volume of the compensation channel and / or the stowage chamber corresponds to 1% to 10%, in particular 1% to 8%, particularly preferably 1% to 5%, of the volume of the component present in excess, based on the volume of the deficiency Component or the volume of the component present in excess based on the volume of the excess component. In a preferred embodiment, two compensation channels are formed in the input part, which each connect the input openings with each other. This prevents any blocking of the flow connection from the inlet opening to the mixing space. In a further embodiment, the inlet channels are designed such that the components to be mixed are conducted separately from one another into the mixing chamber. This prevents premature reaction of the components and possible clogging of the inlet channels. In addition, the separate feeding of the components into the mixing chamber allows a better mixing of the components with one another. It is further preferred if the two inlet openings are arranged diametrically opposite one another in the inlet part, wherein the inlet channels extend along a diagonal connecting the inlet openings and are separated from one another by a transverse wall extending transversely to the diagonal. The partition prevents any possible mixing of the components at the inlet openings, which could clog them. Preferably, the partitions are formed along a part of the circumference of an entrance opening.

If the total circumference of the inlet opening is available for flowing the components into the at least one compensation channel, it is preferred if the partitions in particular along less than 50%, preferably less than 40%, most preferably between 20% and 30% of the total amount of the corresponding Entrance opening are arranged.

If the total circumference of the inlet opening is not available for influx of the components, for example because the inflow of the components through the inlet openings is partially blocked at the radial edge of the inlet, then it is preferred if the partition walls in particular along less than 80%, preferably less than 70%, most preferably between 40% and 60% of the available for inflating the circumference of the corresponding inlet opening are arranged. According to a further preferred embodiment, the inlet channels are designed such that the components to be mixed are at least partially enveloping each other in the mixing chamber. This supports the subsequent mixing process in the mixing chamber. Alternatively, the inlet channels may be in fluid communication with each other so that the components to be mixed are communicated together into the mixing space. In a preferred variant, the at least one compensation channel extends substantially in the form of a circular arc between the inlet openings. Such an arrangement ensures that the components can flow into the compensation channel from each of the inlet openings. In a further embodiment, the at least one compensation channel extends radially outside the inlet channels. As a result, the flow from the inlet openings or inlet channels is led to the outside in the compensation channel, which is particularly preferred when the inlet is arranged centrally in the mixing chamber radially. This results in that the flow first fills the outer compensation channel and the components can then enter together into the mixing chamber. Thus, an interruption of the inlet channels is prevented by the compensation channel and further ensures a relatively short path from the inlet openings into the mixing space, since this path leads along the inlet channels centrally into the mixing space. This further reduces the discharge pressure, since the components must be discharged over a short distance with less effort.

Further, it is preferred if the at least one compensation channel and the inlet channels are formed as recesses or grooves in the input part, which are closed at least partially by the mixer housing or the mixing element. Since the input part is manufactured separately from the mixer housing, further material can be saved in the production in this variant. It is particularly preferred if the mixer housing or the mixing element covers the compensation channel through a disc or funnel-shaped collar in the inlet region of the mixing chamber.

It is further preferred if the compensation channel has a mirror plane running through the center points of the input openings. In addition or as an alternative to this, the compensation channel can have a multiple rotational mirror axis. The number of axes of rotation corresponds in a preferred variant of the number of input openings. Thus, if there are two input ports, a twofold rotational mirror axis is preferred, with three input ports, a three-axis rotational mirror axis is preferred, etc. This symmetry ensures that at mixing ratios of 1: 2 to 1: 1 or 1: 1: 2 to 1: 1: 1 is ensured for more than two components, regardless of the respective leading component compensation of the flow.

Finally, it is preferred that the input part and the mixer housing are designed and adapted to one another such that the components emerging from the input openings and to be mixed from a flow direction extending parallel to the longitudinal axis of the mixer housing by 90 ° in a flow direction transverse to the longitudinal axis of the Mixer housing to be deflected. The deflection prevents the components from passing directly into the mixing chamber past the compensation channel.

In a preferred embodiment, a flow wall is provided along the circumference of at least one inlet opening, which, viewed from the corresponding inlet opening, is concave or convex.

In particular, in the event that the total circumference of the inlet opening is available for flowing the components into the at least one compensation channel, it is preferred if the flow wall, in particular is arranged along less than 50%, preferably less than 40%, most preferably between 20% and 30% of the total circumference of the corresponding inlet opening. If the total circumference of the inlet opening is not available for influx of the components, for example because the inflow of the components through the inlet openings is partially blocked at the radial edge of the inlet, then it is preferred that the flow wall be less than 80%, preferably less is arranged as 70%, very particularly preferably between 40% and 60% of the inflow available to the circumference of the corresponding inlet opening.

In continuation of this idea, it is preferred that the at least one flow wall with a disc or funnel-shaped collar of the mixer housing or the mixing element sealingly closes. In other words, the axial length of the flow wall corresponds to the axial length of the compensation channel.

If a plurality of flow walls are provided, it is preferable to arrange them spaced apart from one another so that the components can flow centrally through the recesses formed between the flow walls in the direction of the mixing element. In this case, the extent of the distance between two adjacent flow walls to each other defines the pressure drop in the center to the mixing element. Preferably, the distance is selected such that the pressure drop between the walls is greater than the pressure drop in the compensation channel, so that leading material flows into the compensation channel before it enters the mixing chamber centrally.

It is preferred if the input part has a storage space that extends radially outside the compensation channel and / or to the inlet channels. The Storage space is sealed in the material discharge direction of the components, so that the components can not flow from the storage space into the mixing element. This separates the storage space from the inlet channels. A storage space is particularly advantageous if large-volume flow is expected. Therefore, especially for 1: 1 deviating mixing ratios, especially 1:10, a storage space of advantage.

Furthermore, it is preferred if at least one of the inlet openings is assigned an optional deflecting plate and / or a flow clip which at least partially covers and / or limits the corresponding inlet opening. The baffle plate is preferably provided above the corresponding inlet opening and therefore lies directly in the material discharge direction, so that the component which flows through the corresponding inlet opening meets the baffle plate as it exits the inlet opening and is deflected, in particular in the direction of the mixing chamber. The flow clip preferably laterally delimits the corresponding inlet opening in such a way that the component which flows through the corresponding inlet opening is directed in the direction of the mixing chamber on exiting the inlet opening. Both the deflecting plate and the flow clamp therefore allow a flow direction for the component flowing out of the corresponding inlet opening to be predefined. This is particularly advantageous if the proportion of the corresponding component is low, so that this component can flow almost completely into the mixing space and any residues in the entrance part are minimized. In this case, the advantages of the deflection plate described above can also be achieved by means of a collar provided on the mixing element if, comparable to the deflection plate, it covers at least one of the inlet openings when the input part and the mixing element are mounted in the mixer. It is further preferred if the mixing element has a flow chamber adjacent to the storage chamber, which is in flow communication with the mixing space via a passage opening. In continuation of this idea, it can be provided that the flow chamber in the material discharge direction is bounded by a transverse wall and that the transverse wall comprises a transverse wall opening, so that the components can flow at least partially through the transverse wall opening. This reduces the discharge pressure as the components discharge through the mixer, resulting in a higher ease of use during discharge.

It is further preferred if the cross section of the mixing element lying perpendicular to the direction of material discharge in the section of the stowage chamber and / or throughflow chamber is 105% to 150%, preferably 105% to 120%, particularly preferably 1 10% ± 5%, of the cross section perpendicular to the material discharge direction of the mixing element in the material discharge direction is considered subsequent section of the mixing element. In other words, the mixing element is enlarged in a region of the stagnation chamber and / or flow chamber. As a result, a higher flow cross-section can be achieved in this area while maintaining the stability of the mixing element, which is advantageous for reducing the discharge pressures, in particular in the case of highly viscous components. Furthermore, the capacity of the storage chamber is improved so that a large volume flow can be recorded. The stagnation chamber and / or flow chamber are preferably provided in the section which overlies the inlet section of the mixing sleeve, which has the advantage that in this section a broadening of the mixing element can be accommodated by a corresponding adaptation of the inner contour of the inlet section of the mixing sleeve. Otherwise, can Of course, the mixing sleeve itself be adjusted according to the widened contour of the mixing element.

The invention will be explained in more detail by means of embodiments and with reference to the drawings. All described and / or illustrated features alone or in any combination form the subject matter of the invention, regardless of their combination in the claims or their relationships.

They show schematically:

1 a to 1 d show a first side view (FIG. 1 a), a second side view (FIG. 1 b), a plan view (FIG. 1 c) and a perspective view (FIG. 1 d) of a first input part, FIG.

2a to 2e several plan views (Fig. 2a to 2c) of the first input part with illustration of the flow directions of the components

3a and 3b are a perspective view (Fig. 3a) and a plan view (Fig.

3b) of a second input part,

4a to 4e are a plan view (Fig. 4a), a perspective view (Fig. 4b) and further plan views (Figs. 4c to 4e) of a third input part,

5a and 5b are a plan view (Fig. 5a) and a perspective view (Fig.

5b) of a fourth input part, 6a to 6c are a plan view (Fig. 6a), a perspective view (Fig. 6b) and a plan view (Fig. 6c) of a fifth input part,

7a to 7e are a plan view (Fig. 7a), a perspective view (Fig. 7b) and further plan views (Figs. 7c to 7e) of a sixth input part,

8a to 8c is a perspective view (Fig. 8a), a side view

(Figure 8b) and a detailed view B (Figure 8c) of a first mixing element,

9a and 9b show a perspective view (Fig. 9a) of a helix mixer and a top view of the corresponding mixer port (Fig. 9b) according to the prior art,

10 shows several top views of an input part and of a mixer when discharging two components at different times according to the prior art,

1 1 is an exploded view of a mixer according to the invention, with mixing element, mixer housing and input part,

Figures 12a and 12b show a first perspective view (Figure 12a) and a second one

Perspective view (Figure 12b) of a second mixing element with input part,

13a and 13b show a first perspective view (FIG. 13a) and a side view (FIG. 13b) of the first mixing element with input part according to FIGS. 12 and 12b, 14 shows several plan views of the second input part, of the mixer and the components 1 and 2 at different times t1, t2 and t3,

15 is a plurality of plan views of the third input part with (top right) and without (top left) inlet channel into the mixing chamber (mixer input),

16a and 16b are a perspective view (Fig. 16a) and a detailed view

(Fig. 16b) of the first mixing element with input part,

17a to 17c show a plan view (FIG. 17a), a perspective view (FIG. 17b) and a longitudinal section (FIG. 17c) along the sectional plane B-B of a seventh input part, FIG.

18a to 18c show a plan view (FIG. 18a), a perspective view (FIG. 18b) and a longitudinal section (FIG. 18c) along the sectional plane E-E of an eighth input part,

19a to 19c are a perspective view (Fig. 19a), a side view

(FIG. 19b) and a longitudinal section (FIG. 19c) along the sectional plane A-A of a third mixing element, FIG.

20a to 20c are a perspective view (Fig. 20a) and a side view

(FIG. 20b) and a longitudinal section (FIG. 20c) along the sectional plane BB of a fourth mixing element, FIG. 21 a to 21 c show a perspective view (FIG. 21 a) and a side view (FIG. 21 b) and a longitudinal section (FIG. 21 c) along the sectional plane CC of a fifth mixing element,

Figs. 22a to 22c are a perspective view (Fig. 22a) and a side view

(FIG. 22b) and a longitudinal section (FIG. 22c) along the sectional plane D-D of a sixth mixing element, FIG.

Figs. 23a to 23c are a perspective view (Fig. 23a) and a side view

(FIG. 23b) and a longitudinal section (FIG. 23c) along the sectional plane E-E of a seventh mixing element, and FIG

Figs. 24a to 24c are a perspective view (Fig. 24a) and a side view

(FIG. 24b) and a longitudinal section (FIG. 24c) along the sectional plane F-F of an eighth mixing element.

Figures 1 a to 1 d show a first embodiment of the input part 1 with inlet openings 2 for the components to be mixed. The first input part 1 has a guide projection 3, whose function is explained in WO 2013/026716 and to which reference is made.

At least one compensation channel 4 is formed between the inlet openings 2 (FIGS. 1 c and 1 d), which connects the inlet openings 2 to one another. Entering through the inlet openings 2 flow is absorbed by the compensation channel 4. The inlet openings 2 are diametrically opposite each other. Further, at each of the entrance openings 2, a flow wall 5 is provided which is formed along a part of the circumference of each entrance opening 2, respectively. Viewed from the respective inlet opening 2, on which the corresponding flow wall 5 is formed, the flow wall 5 is formed along the circumference and thus concave. In that As shown here, the components can not flow over the entire circumference of the inlet openings 2 in the compensation channel 4, as is clear from Fig. 1 c. The mode of operation of the compensation channel 4 will be explained with reference to FIGS. 2a to 2c.

In FIG. 2a, component B forms a flow. The latter exits through an opening and flows along the flow direction 6B past a flow wall 5 into the compensation channel 4. The flow of the component B flows along the compensation channel 4 until the component A also enters the compensation channel 4 along the flow direction 6A stops the flow of component B. Subsequently, both components A and B flow centrally through a further inlet opening into the mixing chamber (not shown).

In the example shown in FIG. 2 b, the component A forms the feed, which flows into the compensation channel 4 along the flow direction 6 A, until the component B likewise flows into the compensation channel 4.

In the example shown in Figure 2c, no component forms a flow, so that both components meet in the compensation channel 4 after half the flow path and then enter through a centrally illustrated here opening 7 in the mixing chamber (not shown). The inlet channel 7a connects the inlet openings 2 through the opening 7 with the mixing space (not shown).

FIGS. 3 a and 3 b show, in perspective view (FIG. 3 a) and in plan view (FIG. 3 b), a modification of the first input part as a second embodiment, wherein at least one of the two input openings 2 Pensationskanal 4 protruding indentation 8 is provided. In the case shown here, two opposing recesses 8 are provided, which directs the flow directions 6A and 6B of the components A and B more strongly to the central opening 7 of the mixing chamber (not shown).

FIGS. 4a to 4e show a third embodiment of the input part 1. Compared to the first input part 1, two further flow walls, here called baffles 9, are provided, which form a circular structure 10 together with the flow walls 5, which are arranged at the inlet openings 2. The flow walls 5 are configured so convex by the respective inlet opening 2, that the center of the circular structure 10 coincides with the center of the input part 1.

FIG. 4c shows the flow direction 6A and 6B in the event that none of the components forms a flow, while in the case illustrated in FIG. 4d the component B forms a flow and in FIG. 4e the component A forms a flow.

The flow walls 5 and the baffles 9 are spaced apart so that openings are formed between each baffle 9 and the adjacent flow walls 5, or each flow wall 5 and the adjacent baffles 9. Through the openings, the components A and B in the centrally located entrance to the mixing chamber (not shown) to flow. Due to the arrangement of the flow walls 5 and the baffles 9, the components A and B first fill the compensation channel 4 and then flow through at least one inlet channel 7a centrally into the mixing chamber.

FIGS. 5a and 5b show a fourth embodiment of the input part 1, which is based on the first embodiment of the input part 1, but was supplemented by a partition 1 1. The partition 1 1 is located between the inlet openings 2 and below the central entrance to the mixing chamber (not shown). Further, two inlet channels of the components are separated from each other in the mixing chamber of the partition wall 1 1.

The fifth embodiment of an input part 1 shown in FIGS. 6a to 6c has a cladding element 12 arranged centrally in the input part 1. Radially around the cladding element 12, a circumferential compensation channel 4 is provided, which receives the flow of the components A and / or B.

The wrapping element 12 is of substantially circular design and has a central opening 12a which opens in the direction of an inlet opening of a component and guides it centrally in the direction of the mixing space. Opposite the central opening 12a, another opening is arranged in the direction of the other component, which guides it in a substantially semi-circular channel 12b around the central opening 12a. As a result, the components A and B are introduced into the mixing chamber approximately coaxially with one another, which facilitates the subsequent mixing of the two components in the mixing chamber.

In the figure 6c, the flow directions 6A and 6B of the components A and B are shown. In the case shown here, no advance of the components A and B is formed.

FIGS. 7a to 7e show a sixth embodiment of the input part 1 with a further variant of a cladding element 12 with flow walls 5. The flow walls 5 prevent a direct inflow of the components A and B into the cladding element 12. increased resistance to flow into the cladding element 12, so that this embodiment is preferred for thin-viscous components.

In FIGS. 8a to 8c, a mixing element 13 with storage chambers 14 is shown, which are arranged in the input area of the mixing space and can receive any flow occurring. The storage chambers 14 are closed at the end in the flow direction of the components, so that the flow does not enter the further mixing chamber and does not distort the mixing ratio. The mixing element 13 has on the input side a disc or funnel-shaped collar 15, which is designed so that it covers the input part 1 and the compensation channel 4 partially or completely closes.

For a better understanding of the effect according to the invention, a helix mixer 16 with known mixer connection 17 and known input part 18 according to the prior art is shown in FIGS. 9a, 9b and 10. FIG. 9b shows the first web 19 of the helical mixer and the inlet openings 2 through which the components flow into the inlet part 18. To illustrate the problem of the prior art underlying the invention, FIG. 10 shows the components A and B and their interface in the input part 18 at different times t1, t2, t3, t4 and t5 increasing at this time. At time t1, it becomes clear in that the one component occupies significantly more volume in the input part 18 than the second component. The first component thus forms a flow and is at the time t2 almost exclusively present in the input part 18. Therefore, in the plan views shown in Fig. 10 below on the mixer and through the mixer tube and at time t3 almost exclusively the leading component in the mixing element is present. Only at the time of further delivery (times t4 and t5) does the proportion of component A decrease. Figure 1 1 shows an exploded view of a mixer according to the invention with a mixing element according to the Fig. 8a to 8c, a mixer housing 13a and an input part. 1

FIGS. 12a and 12b show a further mixing element 13 with an input part 1. It can clearly be seen in FIG. 12a that the disc-shaped or funnel-shaped collar 15 covers the compensation channel 4 in the input part 1 in the delivery direction of the components, so that the components from the input part 1 are centrally conveyed into the mixing element 13 through a central inlet opening 13b (see FIG 13 a).

The transition from input part 1 to the mixing element 13 is also clear from the figures 13a and 13b.

FIG. 14 shows a plurality of plan views of the second input part 1 according to FIGS. 3 a and 3 b, of the mixer and the components A and B at different times and times t 1, t 2 and t 3 increasing in this order. Compensation channel 4 of the invention compensates for the flow of component A, so that both components A and B enter the mixing chamber almost simultaneously (bottom right).

FIG. 15 shows at the top a plan view of the third input part with (upper right) and without (upper left) inlet channel 7a into the mixing chamber (mixer input). In the middle of FIG. 15, the flow of the component A is shown on the left (time t1) and on the right the position of the components A and B shortly before flowing into the central inlet channel 7a (time t2) into the mixing chamber. As can be seen, the flow of the component A is stopped by the flow of the component B, so that the present invention allows a self-regulation in the volume of the flow and also a Compensation regardless of whether the component A forms the flow (as shown) or the component B (not shown). When entering the mixer (bottom in FIG. 15) (time t3), components A and B are present in the mixing ratio of 1: 1 intended here.

Figures 16a and 16b illustrate the storage chambers 14 in the mixing element 13. As can be seen in particular in the detailed view (Figure 16b), the storage chambers 14 are located on a lying through the center of the mixing element 13 line, or diametrically opposite.

The input parts 1 according to a seventh embodiment (FIGS. 17a to 17c) and an eighth embodiment (FIGS. 18a to 18c) are optimized for a mixing ratio of the components deviating from 1: 1. Preferably, the mixing ratio is 1:10.

In this case, an advance of the component present in 10-fold excess is to be expected on a regular basis, since this has a correspondingly higher volume compared to the component in the deficit, so that proportional fluctuations, for example during the filling process, and thus a supply to be compensated, are practically exclusively for the become relevant in excess.

FIGS. 17a to 17c show a seventh input part 1, wherein the component in the low-level can flow into the input part 1 through the inlet opening 2a, while the excess component can flow into the input part 1 through the inlet opening 2b.

The design of the compensation channels 4, the flow walls 5 and the baffles 9 of the seventh input part 1 is comparable to that in the Figures 4a to 4e shown third input part 1, so that reference is made to the corresponding above statements.

Furthermore, the seventh input part 1 comprises a deflecting plate 20 which lies in the material discharge direction and at least partially covers the inlet opening 2a in its radially outer area such that the component flowing in through the inlet opening 2a projects in the direction of the centrally located opening to the mixing chamber 7 (not shown). is deflected (Figure 17c). This prevents that present in the low and flowing through the inlet opening 2a component flows into a region of the input part 1, which is no longer flowed through in the further discharge process by one of the components and therefore no longer enters the mixing chamber. As a result, the baffle 20 prevents a loss of the component in the area in the region of the input part 1. As described above, the advantages associated with the baffle plate 20 can also be achieved by the collar 15 of the mixing element 13.

FIGS. 18a to 18c show an eighth embodiment of the input part 1. The flow wall 5 is here continuous and centrally connected to a web 19 which lies along a connecting axis between the inlet openings 2a and 2b. The inlet opening 2a is enclosed by a flow direction sensor 22, so that the inlet channel 7a points in the direction of the central opening to the mixing chamber 7 (not shown). Radial outboard the compensation channel 4 is provided, which can accommodate the flow. This embodiment has a high Innenvorlumen the compensation channel 4, so that this embodiment is particularly suitable for large-volume heats.

FIGS. 19a to 24c show further embodiments of a mixing element 13 with a storage chamber 14. The components to be mixed can through the centrally provided in the collar 15 inlet port 13b from the inlet part 1 (not shown) to flow.

Figures 19a to 19c show a mixing element 13 according to a third embodiment. From the longitudinal view of FIG. 19b, the arrangement of the storage chamber 14 can be seen in the first part of the mixing element 13, viewed in the material discharge direction. In addition, the sectional plane A-A is shown, while the corresponding longitudinal section is shown in Figure 19c. As the components flow in through the inlet port 13b, they are split at a central wall 23 and flow partially into a stowage chamber 14 and partially into a flow chamber 24. From the flow chamber 24, the components flow through a passage opening 25 to the chambers of the mixing element 13, the length of which Material discharge direction is defined by the transverse walls 26.

In the third embodiment shown here, the cross section of the passage opening 25 is smaller than the cross section of the flow chamber 24. The smaller cross section, here the cross section of the passage opening 25, is decisive for the pressure drop during the discharge of the components. In this case, relatively high discharge pressures can occur , The discharge pressure is also influenced by the specific configuration of the mixing element 13 and the specific viscosity of the components. FIGS. 20a to 20c show a fourth mixing element 13 in a perspective view, a side view and as a longitudinal section along the sectional plane BB. In comparison with the example shown in FIGS. 20a to 20c, the mixing element 13 has been shortened at its end located in the material discharge direction. This reduces the discharge pressure, so this version is suitable for higher viscosity components. Figures 21 a to 21 c show a mixing element 13 in a fifth Ausfuhrungsfornn. In comparison to the third embodiment according to FIGS. 20a to 20c, the draft angles on open sides of the mixing element were increased here. The draft angles in particular have an angle range of 0.1 ° to 2 °, preferably 0.1 ° to 1 ° and particularly preferably 0.5 ° ± 0.1 °.

FIGS. 22a to 22c show a sixth mixing element which has been widened in the region of the stagnation chamber 14 and the flow chamber 24. As a result, the pressure during discharge of the components is reduced, since the total flow cross section is increased in this area. Therefore, this embodiment is particularly advantageous for high-viscosity components. A seventh mixing element 13 is shown in FIGS. 23a to 23c. Here, in comparison with the previous embodiments, the storage chamber 14 is reduced in size such that the passage opening 25 has been enlarged. Here, the flow cross-section of the flow chamber 24 and the passage opening 25 is the same size. This in turn means that the discharge pressure is reduced compared to other embodiments. However, since the stagnation chamber 14 has been downsized, this embodiment is particularly suitable in combination with an input part 1, which has a relatively large compensation channel 4 or a storage space 21. FIGS. 24a to 24c show an eighth mixing element. Here, a transverse wall opening 27 has been added in a transverse wall terminating the flow chamber 24 in the material discharge direction. This allows a portion of the components through the transverse wall opening 27 to flow directly into the adjacent mixing chamber, without the passage opening 25 must be passed. As a result, the discharge pressure of the components is reduced as a part of this does not have to change its flow direction to flow through the passage opening 25.

LIST OF REFERENCE NUMBERS

1 entrance section

2, 2a, 2b inlet openings

3 leadership advantage

4 compensation channel

5 flow wall

6A flow direction of a component A.

6B flow direction of a component B

7 opening to the mixing room

7a inlet channel

8 indentation

9 baffle

10 circular structure

1 1 partition

12 serving element

12a central opening

12b semi-circular channel

13 mixing element

13a mixer housing

13b inlet opening

14 stowage chamber

15 disc or funnel-shaped collar

16 helix mixers

17 mixer connection

18 known entrance part

19 footbridge

20 baffle plate

21 storage space

22 flow direction sensor center wall

Durchflusskannnner

Through opening

partition

Bulkhead opening

Claims

Claims:

1 . Mixer with a mixer housing (13a), which includes a mixing chamber, an input part (1) which can be connected to the mixer housing (13a) and has at least two inlet openings (2, 2a, 2b) for the components (A, B) to be mixed, and a mixing element (13) which extends at least in sections into the mixing space, each of the inlet openings (2, 2a, 2b) being in flow communication with the mixing space via at least one inlet channel (7a), characterized in that in the inlet part ( 1) additionally at least one compensation channel (4) is formed, which connects the inlet openings (2, 2a, 2b) to one another, and / or that at least one storage chamber (14) is provided in the mixing element (13).

2. Mixer according to claim 1, characterized in that in the input part (1) has two compensation channels (4) are formed, each of the input openings (2, 2a, 2b) interconnect.

3. Mixer according to claim 1 or 2, characterized in that the inlet channels are designed such that the components to be mixed are separated from each other into the mixing chamber.

4. Mixer according to claim 3, characterized in that two inlet openings (2, 2a, 2b) are arranged diametrically opposite one another in the inlet part (1), wherein the inlet channels (7a) extend along one of the inlet openings (2, 2a, 2b) connecting diagonal and are separated by a transverse to the diagonal partition (1 1).

5. Mixer according to claim 3, characterized in that the inlet channels (7a) are designed such that the components to be mixed are guided at least partially enveloping in the mixing chamber.

6. Mixer according to claim 1 or 2, characterized in that the inlet channels (7a) are in fluid communication with each other, so that the components to be mixed are passed together in the mixing chamber.

7. Mixer according to one of the preceding claims, characterized in that the at least one compensation channel (4) extends in a substantially arcuate manner between the inlet openings (2, 2a, 2b).

8. Mixer according to one of the preceding claims, characterized in that the at least one compensation channel (4) extends radially outside of the inlet channels (7a).

9. Mixer according to one of the preceding claims, characterized in that the at least one compensation channel (4) and the inlet channels (7a) as recesses or grooves in the input part (1) are formed, which are at least partially closed by the mixer housing (13a) ,

10. Mixer according to one of the preceding claims, characterized in that the input part and the mixer housing (13a) are designed and adapted to each other, that the components to be mixed from the input openings (2, 2a, 2b) from a parallel to the longitudinal axis the mixer housing extending flow direction are deflected by 90 ° in a flow direction transverse to the longitudinal axis of the mixer housing (13a).

1 1 mixer according to one of the preceding claims, characterized in that along the circumference of at least one inlet opening (2, 2 a, 2 b), a flow wall (5) is provided which is concave or convex.

12. Mixer according to claim 1 1, characterized in that the at least one flow wall (5) with a disc or funnel-shaped collar (15) of the mixer housing (13 a) or the mixing element (13) sealingly closes.

13. Mixer according to one of the preceding claims, characterized in that the input part (1) has a storage space (21) which extends radially outward to the compensation channel (4) and / or to the inlet channels (7a).

14. Mixer according to one of the preceding claims, characterized in that at least one of the inlet openings (2a, 2b) is associated with a baffle (20) and / or a Stromungsrichtungsgeber (22), which at least the corresponding input port (2, 2a, 2b) partially covered and / or bounded laterally.

15. Mixer according to one of the preceding claims, characterized in that the mixing element (13) has at least one of the storage chamber (14) adjacent flow chamber (25) which communicates with the mixing chamber via a passage opening (25) in flow communication.

16. Mixer according to claim 15, characterized in that the cross section lying perpendicular to the material discharge direction of the at least one flow chamber (25) amounts to 80% to 120% of the cross section of the passage opening (25) lying perpendicular to the material discharge direction.

17. Mixer according to one of claims 15 or 16, characterized in that the at least one flow chamber (25) in Materialaustragsrichtung by a transverse wall (26) is limited, and that the transverse wall (26) has a transverse wall opening (27).

18. Mixer according to one of the preceding claims, characterized in that the cross section of the mixing element (13) lying perpendicular to the material discharge direction in the section of the storage chamber (14) and / or flow chamber (24) 105% to 150% of the perpendicular to the material discharge Cross-section of the mixing element (13) in the following section.