Pfeiffer Vacuum HILOBE 2704, Operating Instructions Manual

Page: 18 / 68

3 Product description
3.1 Function
The operating principle of the HiLobe roots pump is based on 2 synchronous pistons that rotate in a
housing without touching. The pumping effect is produced as a result of the opposing rotation of 2 fig-
ure-of-eight shaped roots pistons. While suction chambers are formed between the rolling pistons and
the housing, the rolling pistons continuously form a mutual seal without touching each other or the hous-
ing. A pair of gears positioned on the extended shaft ends, causes the opposing, synchronous running
of the roots pistons. Lubrication is limited to the two bearing and gear chambers which are arranged
separately from the suction chambers.
Scan the QR code or click here and see how Pfeiffer Vacuum roots pumps work.
8
3
6
7
9
10
2
11
12
13
1
5
4
Fig. 4: Design, vertical direction of flow
1 Filler screw 8 Fore-vacuum flange
2 Vacuum flange with flange cover (foil) 9 Drain screw
3 Motor power supply plug 10 Measurement connection vacuum side
4 Filler screw 11 Measurement connection fore-vacuum side
5 Fan cover 12 Sight glass, opposite side
6 Sight glass motor side 13 Connecting cable, fan/temperature sensor
7 Connecting cable, fan/temperature sensor
Product description
18/66