Liquid purification or separation – With gas separator
Patent
1995-10-25
1997-12-02
Reifsnyder, David A.
Liquid purification or separation
With gas separator
2105121, 2105123, 554591, 96195, 209715, 4151692, 433 92, B01D 1900, B01D 2126
Patent
active
056932219
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a liquid-separating unit according to the precharacterising clause of claim 1.
BACKGROUND OF THE RELATED ART
A separating unit of that kind is described in EP 0 237 708 B1, which is coaxially mounted on a suction machine. It comprises a liquid-separating cyclone through which the motor shaft of the suction machine is passed. The end of the motor shaft carries a pump impeller which carries liquid deposited in the cyclone out of the cyclone, which is under a vacuum, and into the public drains. To prevent a direct flow connection between the inlet of the cyclone and its outlet which is connected to the suction machine, a substantially cylindrical air discharge part, for directing air into an outlet pipe, is provided in the interior of the cyclone.
If such a separating unit is subjected to very large quantities of surge water, droplets of liquid that stray into the interior of the air discharge part may still pass from there into the interior of the suction machine.
By means of the present invention, therefore, a separating unit according to the precharacterising clause of claim 1 is to be developed in such a manner that any liquid possibly entering the air discharge part is moved towards the pump impellar.
This problem is solved according to the invention by a suction unit having the features specified in claim 1.
A liquid-separating cyclone having an air discharge part connected to a rotating drive shaft is already known in principle from DE 39 16 742 A1. That air discharge part, however, has a substantially cylindrical geometry and is not entirely satisfactory with regard to returning liquid fractions still found there.
SUMMARY OF THE DISCLOSURE
In the case of the liquid-separating cyclone constructed in accordance with the invention, by constricting the revolving air discharge part any liquid fractions still deposited there are forcibly returned to the pump impeller, where the air discharge part has its largest diameter.
Advantageous developments of the invention are specified in subclaims.
A cross-sectional geometry of the air discharge part of the kind specified in claim 2 is advantageous with a view to a favourable flow behaviour for the air and, at the same time, with a view to a reliable return of deposited liquid fractions.
As a result of the development according to claim 3, the air discharged by the cyclone is subjected in the lead-out part to an additional centrifugal effect, which is advantageous with a view to separating residual fractions of liquid.
In the case of a separating unit according to claim 4, it is ensured that liquid fractions of the separated mixture, which liquid fractions have been returned in the air discharge part to the pump impeller are taken by the pump impeller directly at the end of the air discharge part and are finally fed effectively into the liquid outlet pipe.
As a result of the development or the invention according to claim 5, the quantity of air leaving the liquid-separating cyclone is forcibly given additional momentum, which is advantageous with a view to an effective separation of the liquid even before the air enters the air discharge part. This improvement in the liquid separation is obtained without significant additional cost, since the pump impeller has to be equipped with pump vanes in any case.
As a result of the development of the invention according to claim 6, the air discharged from the liquid-separating cyclone is diverted into the air discharge part in a substantially smooth flow.
In the case of a separating unit according to claim 7, there is a very effective dynamic seal between the liquid outlet channel and the liquid-separating cyclone.
Under strong surge conditions, splashes may form in the annular space between the cyclone wall and the air discharge part. In the case of a separating unit according to claim 8, it is ensured that those splashes are retained in the interior of the cyclone.
In that connection, with the development of the invention according to claim 9, the baffle flange is alt
REFERENCES:
patent: 4842478 (1989-06-01), Durr et al.
patent: 4919826 (1990-04-01), Alzner
patent: 5330641 (1994-07-01), Cattani
PTO 96-5544 Translation of German Patent No. 3,916,742 A1, Dec. 6, 1990.
PTO 96-5543 Translation of European Patent No. 0 524 455 A1, Jan. 27, 1993.
Durr Dental GmbH & Co. KG
Reifsnyder David A.
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