CS207925B1 - Apparatus for mixing liquids in a container with movable stirrers - Google Patents

Abstract

The purpose of the invention is to achieve perfect mixing by axial movement of plate stirrers. These stirrers are mounted on a shaft which is sealed against the vessel by a bellows seal. The shaft moves axially, is hollow and is provided with flexible nozzles for aerating the batch. The device can be used where perfect homogenization of the batch is required.

Description

(54) Apparatus for mixing liquids in a container with movable stirrers

The purpose of the invention is to achieve perfect mixing by axial movement of the plate mixers. These stirrers are mounted on a shaft which is sealed to the vessel by a bellows seal. The shaft moves axially, is hollow and has flexible nozzles for aerating the batch.,

The device can be used where perfect batch homogenization is required.

20? ? 25

The invention relates to a device for mixing liquids and suspensions in a container with movable axial stirrers, which can be placed in a batch and continuously operating system.

existing mixers are mainly provided with rotary stirrers which operate at an unsatisfactory degree of efficiency. For a thorough mixing of the suspensions, a considerable radial speed of the stirrer is required, thus generating high shear forces in the region of the ends of the stirrers, which can cause damage to the stirred batch (e.g., in the cultivation of fungal microorganisms). In order to increase the mixing efficiency, there are also various built-in inserts (baffles, cylinders, annulus), which are disadvantageous from the investment and sanitation point of view. To prevent the formation of a central vortex, it is necessary to insert cues into the stirred system. If special tightness of the mixing system is required, the agitator shaft must be provided with seals of special constructions that require the installation of a cooling and lubrication circuit. Due to leaks in the sealing surfaces, these seals cause leakage, requiring the location of slip rings. If the mixing batch is required to be aired, it is necessary to install another piping.

In addition to rotary stirrers, vibrating stirrers are also used, but these are not suitable for slurry mixing.

These disadvantages are overcome by the fluid mixing device of the invention, which consists of plate (axial) stirrers mounted on a shaft which is sealed against the inner part of the vessel by bellows seals, one end part of which is fixed to the shaft which performs axial oscillating movement and the other seals to a fixed part of the container, such as a lid, bottom or walls. Depending on the type and consistency of the batch, the shaft may be hollow and have outlet openings to allow airing or dosing of the necessary additives.

The advantage of the device according to the invention is that it allows perfect mixing of the batch over the entire volume with minimal energy consumption for mixing, since the movement of the mixing elements takes place in the direction of gravity. It is not necessary to install allusions, fittings and aeration pipes. The seals for axial shaft movement are easy to install and remove.

The accompanying drawing shows an exemplary embodiment of an apparatus for mixing and aerating liquids in front view with three plate-type stirrers provided with openings.

The device consists of a container 1, to which the lid 2 is attached. Screws 3 fix the lower flange of the cylinder holder 4 with the cylinder 5 and the upper flange of the cylinder holder 6. ' The hollow shaft sleeve 11 is provided with a piston rod 10 of the hydraulic cylinder 9 provided with a fitting 12 for supplying compressed air. The hollow shaft 13 is sealed to the lower flange of the cylinder holder 4, which at the same time serves as its thrust bearing, by a sealing element ± 4. The fixed part of the upper bellows seal 15 is fixed to the lid 2 of the container 1 via an upper washer 16 by screws 3. the upper end of the bellows seal 15 is firmly clamped between the upper flange 17 and the upper thrust ring 18 by bolts 19, the upper thrust ring 18 by bolts 19, the upper thrust ring 18 is sealed to the hollow shaft 13 by a sealing element 20 The fixed end of the lower bellows seal 21 and the foot bearing 24 are secured to the bottom of the container 22 via a cap ring 29 by bolts 23. The free end of the lower bellows seal 21 is firmly clamped between the lower flange 26 and the lower thrust ring 25 by screws 28. The lower thrust ring 25 is sealing against hollow shaft 13 gasket The clamping couplings 30 are fastened to the clamping couplings 30 and provided with apertures 32 to the clamping couplings 30.

The shape of the holes 32, the size and the number of plate mixers 31 depend on the type of batch to be mixed. In some cases, full plate mixers may be used. Further, the lower part of the hollow shaft 13 is provided with flexible nozzles 33 (air ring, flexible nozzles).

Purified compressed air for aeration of the batch flows through the armature 12 into the hollow shaft 13, which is closed at its bottom, through flexible nozzles 33 to the batch at a height H. The hydraulic cylinder 9 drives the piston rod 10 which is firmly connected via the bushing 11 to the hollow shaft 13. By means of the switches (not marked in the drawing) at the dead center of the hollow shaft 13, the grain of sense is moved and the hollow shaft 13 returns to its second dead center, thereby causing axial movement of the hollow shaft 13 with a Z stroke.

The plate stirrers 31, while axially moving the hollow shaft 13, completely mix the batch over the entire volume of the container 1. The free ends of the top 15 and bottom 21 of the bellows seal are firmly entrained by the hollow shaft 13, the stroke Z being aligned with the bellows ». In the case of smaller agitated batches, the lower bellows seal 21 or the lower bellows seal can be used. drain the foot bearing 24. In this case, the flexible nozzles 33 can be positioned directly in the axis of the hollow shaft 13,

The device according to the invention can be used in all mixing devices where perfect batch homogenization is required.

In addition to a pneumatic or hydraulic cylinder, a shaft, eccentric or cam can be used to drive the shaft with axial oscillating movement. An eccentrically positioned shaft can also be used; in large-volume systems, a larger number of shafts with mixing elements can also be used.

Claims (2)

Object of the invention Apparatus for mixing liquids in a container with movable stirrers, characterized in that the plate stirrers (31) are mounted on a shaft (13) sealed against a fixed part of the container (1) by a bellows seal (15,21), one end part of which is fixed to the axially movable shaft (13) and the other to the fixed part of the container (1), e.g., the lid, the bottom and the like, Device according to claim 1, characterized in that the shaft (13) is hollow and is provided with flexible nozzles (33) for aerating the batch.