3 Product description
3.1 Function
The HeptaDry screw pumps function according to the double screw-pump principle. Two screw rotors
rotate in the compression chamber. The medium to be pumped is trapped between the individual screw
coils, compacted and transported to the gas outlet. During the compression process, the two screw ro-
tors do not come into contact with each other or with the suction chamber.
Fig. 2:
Functional principle with heat exchanger
Operation of this screw pump is instigated with each occurrence of intake pressure between atmos-
phere and final pressure. Despite contactless operation of the screw pump, no operating fluid, such as
oil or water, is necessary within the working chamber. A gas ballast valve, sealing gas device and/or
silencer can be installed at the gas exhaust, depending on the respective application.
4
3
2
14
6
1
7
8
9
12
11
10
5
13
Fig. 3:
Structure of the vacuum pump shown on the Hepta 200 | 300 P as an example
1 Vacuum connection
8
Magnetic sealing plug
2 Eye bolt (2x)
9
Cooling liquid drain screw
3 Cooling liquid filler tank
10
Rubber-metal bumper (4x)
4 Connection for temperature sensor, exhaust side
11
Cooling liquid drain screw
5 Sight glass
12
Gas ballast connection
6 Exhaust connection
13
Temperature switch
7 Sight glass
14
Motor terminal box
Product description
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