Agitating – In vacuum chamber
Patent
1993-07-14
1994-09-27
Jenkins, Robert W.
Agitating
In vacuum chamber
366144, 366220, 366235, B01F 1306, B01F 902, B01F 1506
Patent
active
053502329
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for mixing, homogenizing or reacting at least two, in particular flowable or pourable, components, having a container rotatably seated around an axis and drivable to perform a rotating movement, with at least one closable opening for filling and/or emptying the container.
Mixing devices, wherein a container into which a stirrer is inserted and its shaft is driven to perform a rotating movement, are known in the chemical industry, for example. A number of embodiments of a mixer shaft have been disclosed for mixing viscous or pasty materials, wherein the stirrers or mixing tools must be subjected to relatively elaborate cleaning at the end of the mixing process, depending on the nature of the materials.
In certain cases the use of a mixing tool can result in local heating of the mixed material in the immediate vicinity of the mixing tool, which can also lead to inhomogeneities in the temperature distribution in the immediate vicinity of the mixing tool if such mixing tools are operated at high speeds. The energy transfer during such a mixing process using a mixing tool is subject to losses in respect to the frictional heat occurring between the mixing tool and the material to be mixed and, if it is intended in particular at the same time to achieve a homogeneous heating of the compounds to be mixed, such heat cannot be transferred to the components to be mixed without losses.
It is therefore the object of the invention to provide a device of the mentioned type by means of which it is possible to transfer the expended mechanical energy directly into the material to be mixed, by means of which it is possible to omit separate mixing tools which occasionally must be cleaned and which, in addition, offers an opportunity to adapt the mixing parameters, in particular the extent of homogenization or a homogeneous temperature distribution desired for the chemical reaction, to the respective requirements without disruptive losses. To attain this object, the device essentially is such that it consists of a container which is formed of at least two separately drivable pipe lengths which are in open connection with each other, that the pipe lengths are sealingly seated at their ends facing each other, that the ends of the container which are on the outside in an axial direction respectively have a sealingly closing end wall and that at least one sealingly closing end wall is embodied displaceable in the axial direction of the pipe lengths. Because only the individual partial sections of the container in the form of separately drivable pipe lengths are made to rotate, a mixing zone is formed in the section of the ends of two such pipe lengths facing each other, wherein the mechanical energy transmitted to the components to be mixed by the rotation of the pipe lengths is made directly available to the individual particles of the mixture in the region of the mixing zone. A particularly homogeneous mixing is attained in this way in the mixing zone and, because at least one of the front walls is embodied to be displaceable in the axial direction of the pipe lengths, there is another possibility for affecting the result of the mixing, besides the variation of the rpm of the lengths of pipe or the direction of rotation of the pipe lengths. By applying compression pressure it is possible, depending on the type and consistency of the components to be mixed with each other, to control the mixing effect in the mixing area, and a pressure increase in particular is made possible for the also desired chemical reaction of such components with each other, which in part really makes possible the execution of such chemical reactions. Because of the ability to displace at least one front wall in the axial direction of the pipe lengths, a possibility is provided in addition to operate semi-continuously or continuously, and it is possible in particular to remove by means of the axial displacement of at least one front wall possibly enclosed gases or gases produced in the course of a chemical reaction separat
REFERENCES:
patent: 2297804 (1942-10-01), Siegfried
patent: 2376106 (1945-05-01), Witthofft
patent: 4831959 (1989-03-01), Turner
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