Mixer device

Abstract: The invention concerns a device for an easily releasable mounting of a submersible mixer in a liquid tank. At the bottom of the tank there are provided supports (4), (5), while the under side of the mixer is provided with corresponding openings (6), (7) for receiving the supports. In order to prevent the reaction force from the propeller (2) from tilting the front end of the mixer upwards, at least one of the supports (5) is arranged at a level above the level of the propeller shaft.

Description: The invention concerns a device for an easily releasable connection of a submersible mixer within a liquid tank. In tanks containlng liquids with large amounts of solid bodies, mixers are often used to prevent sedimentatlon and to secure that the liquid is kept homogeneous. A type of mixer which has become very common for this purpose is the so-called submersible mixer which comprises an electric motor with or without a gear box and a propeller. The machine is normally arranged to be lowered along a vertical guide which is mounted within the tank in a suitable way. The advantage with this machine is above all that it is very easy to take up for service and in addition it is very easy to arrange in different directions by turning of the guide. A device of this type is shown in SE-A-8502389. When the mixer operates a considerable reaction force from the propeller occurs which tries to press the mixer backwards and possibly tilt it upwards. By a suitable dimensioning of the guide and the connection between the latter and the mixer, this force can be taken care of and the mixer retains its preferred position. The known device mentioned above has the disadvantage that it is relatively expensive and thus, it has been a desire to replace it by a more simple device when the conditions are such, that the mixer is meant to operate in one position only, without having the possibility to turn. A device of this type is shown in DE-A-3900 630. Here, the guide is designed like a tripod and is attached to the bottom of the tank, the mixer being lowered to its operating position on a shelf adjacent the branching of the guide. In order to stand the reaction force from the propeller, the guide system must by very rigid which means costs, especially if the tank contains corrosive liquid which calls for parts made of stainless steel. According to the invention, the above mentioned problems have been solved by help of the device which is stated in the claims. The invention is described more closely below with reference to the enclosed drawing, which shows the device according to the invention seen from aside. In the drawings 1 stands for a motor and 2 for a propeller. 3 stands for the bottom of a tank, 4 and 5 supports, 6 and 7 openings in the rack of the mixer and 8 guide wires. At the bottom of the tank there are a number of cone-formed supports 4 and 5 arranged on which the mixer shall rest during operation. In order to guide the mixer towards the supports during lowering, the supports are provided with guide wires 8, which extend vertically upwards to the brim of the tank and which go through openings 6, 7 in the mixer or in its rack. The openings 6, 7 are formed like cone-formed shells which are adapted to the supports 4, 5. This means that the mixer stands rigidly on the supports after having been lowered along the guide wires 8. Said wires may then be brought aside and attached to the wall of the tank in order not to disturb the mixing process. In order to secure that the reaction force from the propeller 2 will not cause the device to tilt upwards, the supports 5 situated away from the propeller are placed at a higher level than the supports 4 adjacent the propeller and also above the level of the propeller shaft. This means that the reaction force from the propeller will act below the supports 5 and thus press the mixer downwards instead of tilting it upwards. The great advantage with the device is thus that a simple and stable support of the mixer is obtained when no changing of the inclination of the mixer is desired. The guiding of the mixer towards its operating position along the guide wires is a non-expensive solution as compared with the guide pipes which are normally used.

Claims: A device for an easily releasable mounting of a submersible mixer comprising an electric motor (1) and a propeller (2) on a substantially horizontal driving shaft in a liquid tank, the mixer in its operating position being supported by a number of cone-formed supports (4), (5) which enter corresponding openings (6), (7) on the under side of the mixer or on an attached mixer rack, characterized in that the supports (4), (5) are so positioned that at least two supports (4) are arranged near the front end of the mixer by the propeller (2), while at least one support (5) is arranged near the other end of the mixer and at a level higher than the level of the previously mentioned supports (4) and also higher than the level of the propeller shaft, thus preventing the reaction force from the propeller to raise the front end of the mixer during operation. A device according to claim 1, characterized in, that to the cone-formed supports (4), (5) are connected vertically directed guide means, such as wires (8), along which the mixer is moved during lowering and raising.

Inventors: HOVSTADIUS GUNNAR, HOVSTADIUS, GUNNAR
Applicants: FLYGT AB ITT, ITT FLYGT AKTIEBOLAG
Application year: 1991
Main classification: B01F7
IPC codes: B01F7