EP3065852B1 - Agitator for mixing fluids - Google Patents

Description

The invention relates to a stirrer for mixing fluids having different viscosities according to the preamble of claim I.

Stirrers for stirring or mixing of fluids are known. For stirring or mixing of the fluid propellers or modifications of a propeller are used, which are referred to as agitators. Under propeller or the modifications is to be understood a device which consists of two or more evenly spaced around a shaft leaves or wings. The propeller mixes fluids as the blades rotate around the shaft.

Stirrers with propellers are used for mixing different fluids. So goes from the patent CH 690836 A5 an agitator for stirring a dough, the attachment of further elements on the blades to influence the flow behavior produced.

The utility model AT 007987 U1 is to take a stirrer for biomass, sewage sludge or the like, the propeller shaft or its drive shaft relative to the horizontal is inclined at different angles in order to achieve a better spatial mixing of the fluid.

A sliding propeller of a stirrer, which is longitudinally displaceable along its drive axis, the utility model DE 20 2008 015 990 U1 be removed. A propeller, which can be tilted with its drive axle, is in the patent DE 197 56 485 C2 disclosed.

From the publication DE 10 2010 002 461 A1 For example, an agitator is known which is enclosed by a jacket with a plurality of openings, so that the fluid is pulled or pushed through the channel and thereby a movement is generated.

In addition to using different types of propeller, there are other forms that have been used to mix fluids, such as the DE 91 02 832 U1 . DE 20 2011 052 408 U1 . DE 20 2011 107 055 U1 , of the DE 6 910 714 T2 or the DE 88 11 813 U1 can be removed.

Furthermore, goes from the DE 154 115 C an agitator for mixing fluids having different viscosities. The agitator has a main shaft with an axis of rotation and paddles which are connected to the main shaft. The paddles each have a paddle shaft with a paddle shaft axis, wherein these are arranged to the rotation axis at an angle with a value between 20 ° and 40 °. Relative to the main shaft, a radial distance of the paddle shafts at a lower end of the paddle shafts, which is remote from the main shaft, greater than a, based on the main shaft, radial distance of the paddle shafts facing one of the main shaft formed upper end of the paddle shafts. The paddles, ie the paddle surfaces of the paddles are aligned in a plane to each other.

The object of the present invention is to provide an agitator which brings about an improved mixing of the fluids.

The object is achieved by an agitator for mixing fluids with the features of claim 1. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the respective subclaims.

The agitator according to the invention for mixing fluids having different viscosities, wherein the agitator is a bionisches agitator, comprises a main shaft with a rotation axis and paddle. The paddles are connected to the main shaft, the paddles each having a paddle shaft with a paddle shaft axis. The paddle shaft axes have a first angle to the axis of rotation, which has a value between 20 ° and 40 °. The paddles are arranged with their paddle surfaces at a second angle of 90 ° to each other. During operation of the agitator, the paddles have a first rotation about the main shaft and a second rotation about the respective paddle shaft axis. A radial first distance of the paddle shaft axes relative to the axis of rotation at a lower end of the paddle shafts, which is remote from the main shaft, is greater than one, relative to the axis of rotation, radial second distance of the paddle shaft axes on one of the main shaft facing the upper end of the paddle shafts. The advantage is an outward inclination of the paddles in a region of the paddles facing away from the main shaft, so that an improved flow in the fluid can be achieved.

From the prior art, an inclination of the paddles in the region of the paddles facing away from the main shaft to the inside, so a position of the paddle trained facing the axis of rotation is known. With the same shape of the paddle, the position of the paddles according to the invention leads to a substantially larger circumferential radius due to the outwardly directed paddles, whereby a likewise increased flow radius can be achieved, which ultimately leads to improved flow of the fluid and thus to improved mixing of the fluid. According to the invention, the first rotation is transferable to the paddles by a rotationally fixed connection formed between the main shaft and the paddle, and the second rotation is transferable to the paddles by a rolling element gear, the rolling element gear being formed between the main shaft and the paddles. The rotationally fixed connection is rotatably formed by means of the paddle shafts with the help of the paddle shafts rotatably receiving second guide tubes, which are rotatably connected to the main shaft. To form the rotationally fixed connection, the second guide tubes are non-rotatably accommodated on a housing, which is non-rotatably connected to the main shaft. Thus, it is possible to fix the guide tubes on the housing.

In a further embodiment of the agitator according to the invention, the Wälzkörpergetriebe on gears. With the help of the gears can be transmitted preferably large forces.

Preferably, the gears are designed in the form of bevel gears, so that in a simple manner an inclination of the paddle shaft axis can be achieved to the axis of rotation. According to the invention, the Wälzkörpergetriebe is received in a transmission housing, whereby penetration of the fluid can be prevented and completely prevented by means of seals on the transmission housing.

Preferably, the paddle shafts on stabilizing tubes, which have holding plates, and wherein the stabilizing tubes are designed with notches for more feather keys of the paddle shafts. Thus, a quick and accurate installation is possible and the paddle advised during operation not from the intended angles or not from their intended positions. This attachment can also be made by closures, bolts and other mechanical Verschraubungsarten.

In a further embodiment of the agitator according to the invention, the paddle shafts at a remote from the paddle end formed feather keys for connection to stabilizing tubes, wherein brackets of the paddles are provided. This ensures that the stabilizing tubes of the paddles can be mounted quickly and the paddle waves do not slip between the paddle shafts and the paddle stabilizing tubes as the paddles move. Alternatively, however, all sorts of closures, bolts and mechanical fittings can be used.

In a further embodiment of the agitator according to the invention, the paddle shafts are rotatably received in second guide tubes, wherein they are connected via reinforcements with a transmission housing a lower translation, and wherein they are mounted and sealed against the translation housing multiple times. The advantage is that with the help of the second guide tubes improved stability and a quiet stirring behavior is formed and at the same time the penetration of the fluid is prevented in the interior of the lower transmission case.

Fig. 1

in einer perspektivischen Darstellung ein erfindungsgemäßes Rührwerk mit einem Antrieb,

Fig. 2

in einem Schnitt eine untere Übersetzung des Rührwerks gem. Fig. 1,

Fig. 3

in einer perspektivischen Ansicht die untere Übersetzung gem. Fig. 2,

Fig. 4

in einer perspektivischen Ansicht Paddel des Rührwerks gem. Fig. 1,

Fig. 5

in einem Teilschnitt die untere Übersetzung mit Paddel, und

Fig. 6

in einer Draufsicht die untere Übersetzung mit Paddel.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing. For reasons of clarity, it is possible that the elements are not provided with reference numbers in all figures, but without losing their assignment. Show it:

Fig. 1

in a perspective view of an inventive agitator with a drive,

Fig. 2

in a section, a lower translation of the agitator gem. Fig. 1 .

Fig. 3

in a perspective view, the lower translation acc. Fig. 2 .

Fig. 4

in a perspective view paddle of the agitator acc. Fig. 1 .

Fig. 5

in a partial section the lower translation with paddle, and

Fig. 6

in a plan view the lower translation with paddle.

An inventive agitator 1 for mixing fluids, in particular a bionic agitator is gem. Fig. 1 built up. The agitator 1 has a drive 2, by which it can be set in motion. The drive 2 may be formed electrically, pneumatically or hydraulically. In the illustrated embodiment, the drive 2 is designed in the form of an electric motor.

Alternatively, water or a steam, gasoline or other kind of internal combustion engine can be used. The drive 2 of the bionic agitator 1 depends on the viscosity and the amount of fluid that must be moved or mixed and after the objective.

The drive 2 is coupled to a transmission 3, which in turn drives a main shaft 4 of the agitator 1, which is connected to a lower gear ratio 5 of the agitator 1, s. especially Fig. 2 , A gear ratio used depends on the particular fluid and the objective. Depending on requirements, the gear ratio is used with slow to fast running properties. The gear ratio is also tuned to the particular drive 2 used to achieve an energy-efficient and gentle mixing of the respective fluid.

The main shaft 4 is stored several times. This multiple storage allows a relatively smooth rotation about its axis of rotation 6. Furthermore, the multiple storage, since the main shaft 4 carries the whole weight of the agitator 1, an improved weight distribution to the individual bearings.

An exact fit of the connection from the gear 3 to the main shaft 4 is made by means of a feather key.

For mounting the bionic agitator 1, a mounting plate 8 is provided. The mounting plate 8 can be connected by means of highly efficient screws, gaskets and bearings with the device which is intended for assembly and which may consist of wood, concrete, stone, plastic or metal.

In this embodiment, the mounting plate 8, for example, on a non-illustrated lid of a non-illustrated closed space in which the fluid to be stirred is attached. By this connection of the bionic agitator 1 with the lid, first, a stability of the bionic agitator 1 is achieved and, secondly, prevents the fluid from escaping or unwanted fluid in the space in which the fluid is stirred, can occur. Depending on the nature of the lid and the fluid different seals and different fastening devices are used. This design allows a quick replacement of the respective components and allows a quick start-up of the bionic agitator 1 during construction, maintenance or repair.

The mounting plate 8 is fixedly connected to a guide tube 9, inside which the main shaft 4 extends to the lower gear 5, which is received in a lower gear housing 10. The guide tube 9 may take other forms than a tube and the material may vary again here. The important thing is that it is so tight that the fluid does not get inside.

At the lower end of the guide tube 9, which is positioned facing the lower gear 5, this is coupled with a connection 11 with the lower gear 5, which is rotatable. Again, it applies again that the connection must be so close that no fluid gets inside and that the lower gear housing 10 is rotatable. Both requirements are achieved by different seals and bearings.

In the transmission housing 10 is the end facing away from the drive 2 formed end 12 of the main shaft 4, which is connected to the transmission housing 10 via a bearing bracket 13. By the rotation of the main shaft 4 and the gear housing 10 is set in rotation, so that the entire lower part of the bionic agitator 1 rotates about the axis of rotation 6 of the main shaft 4. In other words, this means that the main shaft 4 is rotatably connected to the transmission housing 10.

In the gear housing 10 bevel gears 14 are added, which mark a drive 2 facing trained end of paddle shafts 15. As Fig. 2 can be removed, each has a paddle shaft 15 a bevel gear 14. The bevel gears 14 are, as in particular in Fig. 2 recognizable, via a drive gear 16 which is rotatably connected to the main shaft 4, with each other in operative connection. Thus, a Wälzkörpergetriebe is formed.

The bevel gears 14 are driven by the conical drive gear 16 of the main shaft 4. Due to the compound, i. rotationally fixed connection of the bevel gears 14 with their respective associated paddle shaft 15, the paddle shafts 15 are set in rotation.

The trained by the bevel gears 14 and the drive gear 16 drive the paddle shafts 15 in the transmission housing 10 may also be made by means of a toothed belt drive, rotary joint drive, belt drive, chain drive, magnets and others.

It is important that the transmission housing 10 is sealed so far that no fluid gets inside and that the flow generated in the fluid is not affected by the size and shape of the transmission housing 10.

On an underside 17 of the transmission housing 10, which is remote from the drive 2, second guide tubes 18 of the paddle shafts 15 are formed, wherein each second guide tube 18 comprises a paddle shaft 15 at least partially.

By means of reinforcements 19, which are formed on the underside 17, the second guide tubes 18 are fixed to the transmission housing 10. These reinforcements 19 provide greater stability and smooth and smooth movement of paddles 20 attached to the paddle shafts 15. In particular Fig. 1 can be removed, depending on a paddle shaft 15 a paddle 20.

The paddle shafts 15 are received in their respective associated second guide tubes 18 and are stored multiple times. At the same time they are sealed several times, so that no fluid can penetrate into the interior of the transmission case 10. At this point it should be mentioned that the said seals can be in the form of suitable rubber seals or metal seals. In this case, in particular, the fluid to be mixed is taken into account, and to note the extent to which there is a corrosive and / or seething tendency of the fluid relative to the material of the seals used.

At a lower end 21 of the paddle shafts 15, which is remote from the transmission housing 10 and from the main shaft 4, these are provided with further keyways 22 for connection to stabilizing tubes 23 and brackets in the form of holding plates 24 of the paddle 20. The further feather keys 22 ensure that the stabilizing tubes 23 of the paddles 20 can be mounted quickly and, when the paddles 20 move, the connection between the paddle shaft 15 and the respective stabilizing tube 23 does not slip or become disengaged.

In particular Fig. 2 can be seen, is relative to the axis of rotation 6 radial first distance of the paddle shaft axes 28 at the lower end 21 is greater than a relation to the axis of rotation 6 second distance of the paddle shaft axes 28 on one of the main shaft 4 facing upper end of the paddle shafts 15, in particular the bevel gears 14.

The stabilizing tubes 23 are mounted on the paddle shafts 15 with the holding plates 24, which are provided with notches for the further keyways 22, not shown. This attachment can also be made by closures, bolts and other mechanical Verschraubungsarten.

The stabilizing tubes 23 of the paddles 20 serve as supports of the paddles 20, they provide the respective paddle 20 additional stability and also prevent rotation of paddle outer surfaces 25 of the paddle 20. In other words, this means that the stabilizing tubes 23, the paddle 20 in position relative to each other and relative to the main shaft 4 stabilize, so that a deposition is prevented and angles or angular positions, as explained below, are retained.

The paddles 20 are provided with metal angles 26 for reinforcement and flow enhancement of the paddles 20. Also paddle edges 27 of the paddle 20 are turned over to also improve the flow behavior of the paddle 20.

Shape, in other words outer contours, and size of the paddle 20 depends on the fluid and the amount of fluid that needs to be circulated. The following shapes are used for the paddle 20: round, oval, triangle, trapezoid, rhombus, rhombus, parallelogram, square, rectangle, quadrangle and natural forms from the animal kingdom and nature. At the same time, the paddle 20 can be bent or deformed if this serves for the stability of the paddles 20 and / or positively influences the flow behavior of the fluid. The paddle 20 is like in the FIGS. 1 . 2 . 4 and 6 represented, flat or plate-shaped.

The paddle shafts 15 with their shaft axes 28 and in axial extension the paddles 20 with their coaxial paddle axes 29 are positioned at a first angle α of 20 ° to 40 ° to the main shaft 4, so that an ideal flow behavior of the fluid is generated.

The paddles 20 are to be attached to the paddle shafts 15 such that the paddle surfaces 30 are at a second angle β of 90 ° to each other, in particular Fig. 6 can be removed so that an ideal flow behavior of the fluid is generated. For a better understanding, a first sectional plane E1 of the one paddle surface 30 and a second sectional plane E2 of the other paddle surface 30 are drawn. It can be seen that the paddle surfaces 30 are arranged at a second angle β with a value of 90 ° to each other.

As a result of the rotations of the paddles 20, that is to say by a first rotation of the paddles 20 about the axis of rotation 6 and by a second rotation of the respective paddles 20 about their associated paddle shaft axis 28, the fluid from the paddles 20 will be in front of them pushed or displaced. The resulting motion causes the fluid to be displaced 360 °, which in turn causes the components of the fluid to be completely mixed and maximize the homogeneity of the fluid.

With this movement of the fluid turbulences are reduced as much as possible and shear forces are avoided. As a result, a much better mixing of the fluid is realized. At the same time, the movement of the paddles 20 and the movement generated in the fluid result in much less energy being required to keep the fluid in motion than conventional agitators. Another advantage of this type of agitation is that any solids contained in the fluid do not wrap around the paddles 20 or joints, that is, the paddle shafts 15, the retainer plates 24, and the stabilizer tubes 23.

The Figures 3 and 5 serve the improved clarity.

The agitator 1 is in various sizes and designs for a variety of applications in which fluids are circulated or mixed, manufactured and offered. For example, these may be agricultural operations (such as biogas plants with and without gas hoods, manure tanks, milk cooling, etc.), industry (such as emulsion basins, agitation techniques in laboratories, etc.), the food industry (such as lemonade and fruit juice manufacturers, dairies , Breweries, etc.), in communities and municipalities (sewage treatment plants, drinking water treatment, stagnant waters, etc.) and much more act.

The bionic agitator can be made of any type of wood, plastic, carbon, metal and other existing materials. The connections, in particular the paddle shafts 15, the holding plates 24 and the stabilizing tubes 23, which connect the components of the bionic agitator are always dependent on the type and nature of the material from which the agitator is built. Accordingly, the compounds can be screwed, glued, plugged or riveted.

The bionic agitator 1 according to the invention relates to the stirring in different areas, such as stirring in biogas plants with and without gas hoods, the agitation of manure storage in farms, stirring in sewage treatment plants in communities, municipalities and cities, stirring in Water treatment plants, stirring in laboratories, stirring in the food industry, stirring in the metal industry, stirring in the chemical industry, circulating air in residential buildings and residential complexes, circulating air in air-conditioned and heated rooms, circulating air in nurseries the circulation of air in commercial and industrial installations, on any orientation of the agitator in the horizontal and vertical position, on any type of installation, on any agitator design in terms of size and material used, on any agitator described, such as type of agitator Drive, the translations, the seals and the compounds of the described deviates, but otherwise has the same objective as described bionic agitator 1 has.

Claims (6)

1. Agitator for mixing fluids with different viscosities, wherein the agitator (1) is a bionic agitator, comprising a main shaft (4) with a rotational axis (6) and paddles (20) which are connected to the main shaft (4),
   wherein the paddles (20) each comprising a paddle shaft (15) with a paddle shaft axis (28), and wherein the paddle shaft axis (28) extending at a first angle (α) relative to the rotational axis (6) in a range of between 20° and 40°,
   and wherein the paddles (20), during operation of the agitator (1), perform a first rotation around the main shaft (4) and a second rotation around the respective paddle shaft axis (28),
   wherein
   a radial first distance of the paddle shaft axes (28) relative to the rotational axis (6) at one lower end (21) of the paddle shafts (15), said end being formed facing away from the main shaft (4), is greater than a radial second distance of the paddle shaft axes (28) relative to the rotational axis (6) at an upper end of the paddle shafts (15) which is formed facing the main shaft (4), and wherein
   the first rotation may be transferred to the paddles (20) via a non-rotatable connection (10, 18) between the main shaft (4) and the paddles (20), and the second rotation may be transferred to the paddles (20) via a shaft drive (14, 16) provided between the main shaft (4) and the paddles (20), and wherein
   the non-rotatable connection (10, 18) is formed by means of second guide tubes (18) rotatably accommodating the paddle shafts (15) and connected non-rotatably to the main shaft (4), characterised in that the paddles (20) are arranged with their paddle surfaces (30) at a second angle (β) of 90° relative to one another, wherein to form the non-rotatable connection (10, 18) the second guide tubes (18) are accommodated non-rotatably at a transmission gear housing (10) which is connected non-rotatably to the main shaft (4), wherein the friction drive (14, 16) is accommodated in the transmission gear housing (10).
2. Agitator according to claim 1, characterised in that the shaft drive (14, 16) comprises gearwheels (14, 16).
3. Agitator according to claim 2, characterised in that the gearwheels (14, 16) are bevel gears.
4. Agitator according to one of the preceding claims, characterised in that the paddle shafts (15) have stabilising tubes (23) with mounts (24), and wherein the stabilising tubes (23) are provided with notches for additional feather keys (22) of the paddle shafts (15).
5. Agitator according to one of the preceding claims, characterised in that the paddle shafts (15) at an end facing away from the paddle (20) comprise feather keys for connecting to stabilising tubes (23), and wherein mounts (24) of the paddles are provided.
6. Agitator according to one of the preceding claims, characterised in that the paddle shafts (15) are accommodated rotatably in second guide tubes (18), wherein they are connected to a transmission gear housing (10) of a lower transmission gear (5) via reinforcing means (19), and wherein they are supported by multiple means and sealed by multiple means against the transmission gear housing (10).

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