Housing with heating bath, rotary flask and drive

Only housing models with integrated heating bath are available for size R20 rotary evaporators. The possibility of lowering the bath heating is not necessary here because the overall height and the content of the flask are low.To make assembly and disassembly easier the flask can be equipped with an additional support ring. Housings for the R50 and R100 rotary evaporators can be delivered with permanently installed or lowerable heating bath. With the model just mentioned the bath heating is raised and lowered using a hydraulic cylinder. The standard version activates it with a hand pump or a pressure outlet valve. The special model on the other hand is delivered with an electrical oil pump and an on/off button on the operator panel. In the event of power failure or network shutdown, in both variants the heating bath is forcibly lowered with a magnetic valve. The entire hydraulic installation including the oil supply container is placed in the housing. All heating baths can be heated either electrically or with steam. Either water or other heat exchangers, e.g. oil, can be used as a bath liquid. A splash guard keeps back the entrained bath liquid with the rotation of the flask and serves at the same time as protection against accidental contact.

The rotary evaporator’s housings are delivered ready for connection i.e. including internal pipework and wiring. The accesses and outlets for the cooling water to and from condenser parts are in the housing wall. The associated manually actuated valve is placed on the operator side. A duct is planned for the electrical connection.

Rotary flask
In all rotary evaporators this consists of nearly totally corrosion-resistant borosilicate 3.3 glass. Attachment to the drive makes detachment easier using hasp screws. Use of special palettes when assembling and disassembing the flasks also simplifies this job. Such palettes are, however, only usable in housing versions with lowerable heating baths and can be delivered as an accessory.
The nominal capacity of the flasks is 20, 50 or 100 litres. For the purpose of intensive intermixing as well as for powdered substances the rotary flasks can also be delivered with indentations (internally raised) distributed above the surface.

Drive
In all models a robust and proven drive motor serves as a power plant for the rotary flask. Its driving motor speed can be continuously adjusted by hand. Speed measurement with digital display on the operator panel can be provided.
An electric motor with frequency converter, setpoint adjuster and digital display can be provided as an alternative to the drive motor, likewise at extra cost.
A PTFE-lined steel sleeve shaft serving as a vapour pipe, to which the rotary flask is permanently attached, is directly driven at the same time. This sleeve shaft is sealed against the condenser part by a PTFE axial face seal. The connection of drive and condenser part is made by a PTFE bellows.
All rotating parts, including the connection flange of the rotary flask are sealed with a protective cap.

Technical data

1) Alternative motor with electrical speed regulation by frequency converter at extra cost
2) Surface temperature limit 160°C, for the ex apparatur 120°C