An agitator and a method of replacing a shaft seal of an agitator

Abstract

The present invention relates to an agitator. The present invention especially relates to an agitator comprising a drive unit (2) coupled by means of a coupling (16) to a first end of a drive shaft (18), a propeller (8) attached to a second end of the drive shaft (18), the drive unit (2) being attached to a mounting flange (22) adapted for fastening the agitator to a wall of a mixing vessel, the agitator further comprising a support housing (6) having at least a tubular support frame (24) with a first end and a second end, the first end of the tubular support frame (24) being attached to the mounting flange (22), the second end of the tubular support frame (24) being provided with a support bearing (30) for supporting the second end of the drive shaft (18), wherein a shaft seal (20) is arranged at the first end of the tubular support frame (24) and sealing means (32) is arranged in connection with the second end of both the drive shaft (18) and the tubular support frame (24).

Description

technical field [0001] The present invention relates to an agitator and a method of replacing the shaft seal of an agitator. The present invention relates to a stirrer for stirring or mixing the contents of a mixing vessel, tank, tower or tank, the blades of which are located at a distance from the wall of the mixing vessel, tank, tower or tank. Preferably, the stirrer of the invention is a side-mounted stirrer, ie a stirrer fastened to the side wall of a mixing vessel, tank, column or tank. In particular, the present invention relates to such agitators and a method of replacing shaft seals of agitators without the need to empty the mixing vessel, tank, tower or tank, but within the time required for the replacement operation to be located within the mixing vessel, tank, tower or tank The paddles of the mixer inside can be left on the shaft of the mixer without the risk of leakage of the liquid to be mixed or stirred. Background technique [0002] So-called side-mounted ag...

AI Technical Summary

Problems solved by technology

The document does not give any advice on how to support the shaft, so there is a risk that the support bearing at the second end of the shaft will be damaged as a result of the slight wobble of the shaft there

Furthermore, although it has been discussed that the plug and seal seat prevent leakage when the shaft is pulled outwards, on the one hand, it is not indicated how to keep the shaft in its pulled position during servicing of the shaft seal, and on the other hand, the shaft's Slight rocking results in a small deformation in the direction of the sealing surface, whereby there is a clear risk that the seal will start to leak

Regarding the locking of the shaft against movement in the circumferential direction by means of locking means located in the mixing vessel in communication with the liquid being mixed, it has been proven that the user can never be sure that the locking is working properly

It is very common that the fluid in the mixing vessel includes solids or some substance which tends to collect in the groove of the locking device, whereby the locking will not be secure

Finally, angular gears themselves cannot be used for the entire range of motors and mixers required for different mixing applications due to their construction being limited to a certain reduction range

Therefore, the angular gear should be combined with another reduction gear, which significantly increases the cost of the drive

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