Elmo-rietschle L-BV7 Manuel d'utilisateur télécharger pdf (Page 18)

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Description of Vacuum Pump/Compressor

5 Description of Vacuum Pump/Compressor

Fig. 3: Design and operation of liquid-ring

vacuum pumps/compressors (cross-section of

operating chamber)

1 Discharge connection

2 Operating-liquid port

3 Inlet connection

4 Impeller

5 Housing

6 Discharge port

7 Inlet port

8 Operating liquid

5.1 Design

The L-BV7 2BV7s are liquid-ring vacuum

pumps compressors. They consist of the

vacuum pump/the compressor itself and an

electric motor. For the detailed design, see

Fig. 3, Pg. 18.

The pumped gases/vapors are sucked via the

inlet connection (3) into the pump-motor unit

and pushed out via the discharge connection

(1).

The impeller (4) with the blades is located in

the cylindrical housing (5). The impeller is

arranged eccentrically relative to the housing.

In addition, the housing also contains the

operating liquid (8). This liquid is fed in via the

operating-liquid port (2) and output together

with the pumped gases/vapors via the

discharge connection (1).

5.2 Operating method

When the impeller turns, the operating liquid is

put into motion and accelerated. This forms a

liquid ring that also rotates. Due to centrifugal

force, this ring is arranged concentrically to the

housing and eccentrically to the impeller.

During a complete rotation of the impeller, the

following occurs:

 The impeller cells are completely filled with

operating liquid at the upper vertex.

 During the first half rotation, the liquid ring

lifts off the impeller hub. The space in the

cells increases so that the pumped

gases/vapors are sucked in through the

inlet port (7).

 The space in the cells is largest at the lower

vertex, as these are virtually free of

operating liquid.

 During the second half rotation, the liquid

ring approaches the hub again. The space

in the cells decreases so that the pumped

gases/vapors are compressed and pushed

out through the discharge port (6).

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Elmo-rietschle L-BV7 Manuel d'utilisateur Page 18

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