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 compaction process, the two screw rotors
do not come into contact with each other, nor with the suction chamber.
Fig. 2:
Operating principle
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.
1
2 3
4
5
7
8
9
10
6
12
13
14
15
16
17
18
19
20
11
Fig. 3:
Arrangement of screw pump
1
Frequency converter
11
Cooling water outlet
2
Eye bolt (2x)
12
Filler screw
3
Thermal circuit breaker
13
Magnetic sealing plug
4
Vacuum connection
14
Sealing gas connection
5
Filler screw
15
Drain screw
6
Locking screw for screw rotors
16
Cooling water drain screw
7
Magnetic sealing plug
17
Drain screw
8
Exhaust connection
18
Condensate drain
9
Sight glass (2x)
19
Silencer
10 Cooling water inlet
20
Rubber-metal bumper (4x)
3.1.1 Water cooling
Connection to an external cooling water supply dissipates heat which is generated during compression
of the gas. The cooling water flows through the cooling chambers of the screw pump and absorbs the
heat there.
3.1.2 Temperature monitoring
The switching temperatures are dependent upon the pump size and the type of cooling system. Tem-
perature monitoring prevents overheating and potential blockages in the screw pump.
Product description
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