Edwards A311-01-985, Инструкция по эксплуатации

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A311-03-880 Issue A
Page 2 © Edwards Limited 2014. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Introduction
1.2 Description
Refer to Figure 1 . The HV8000 pumps are positive displacement pumps. They must be used with a suitable backing
pump or pumps: refer to Table 2 .
The HV8000 pumps are available in two versions:

'VF' (Vertical Flow) pumps which provide for a vertical gas flow through the pump.

'HF' (Horizontal Flow) pumps which provide for a horizontal gas flow through the pump.
The HV8000 pumps can be supplied in 'bareshaft' form without any motor or fitted with a 18.5 kW IEC motor.
HV8000 VF and HF pumps with motors are supplied with the motor mounted via a bell-housing and connected through
a direct drive coupling: refer to
Figure 3 and 5 .
If your pump is supplied as a bareshaft pump, you may connect your own coupling or belt drive system (refer to
Section 3.7 ) to the drive shaft of the pump in order to operate the pump. The maximum power rating and maximum
pump speed must not exceed the values shown in Table 2 .
Alternately, two motor mounting kits are available to enable customers to fit their own motors. The first kit is
suitable for use with motors to an IEC specification not exceeding 18.5 kW with a 160 Frame size and FF300 flange.
The second kit is suitable for use with motors to a NEMA specification not exceeding 25 hp with a 284TS Frame size
and a D type flange. These kits include the appropriate bell-housing, coupling and fixings.
For specific applications, bareshaft pumps may be fitted with motors of higher power ratings than those given above
and controlled through a Variable Frequency Drive (VFD). Customers must consult with Edwards Applications Group
for information relating to such applications.
Refer to Section 2.11 for the Item Numbers of the different pump versions.
1.3 Principle of operation
Refer to Figure 1 . The HV8000 pumps are positive displacement pumps, which incorporate two contra-rotating twin-
lobe rotors:

One of the rotors is driven by the drive shaft (18).

The other rotor is maintained in the correct phase relation by timing gears.
During operation, the inlet gas stream to be pumped enters the pump at the inlet (4).
As the two contra-rotating rotors turn, the inlet gas is trapped in the chambers which form between the rotors and
the pump-body, and is eventually forced out of the pump at the outlet (14).
The timing gears and the bearings on the rotors and drive shaft are lubricated by oil in the drive end cover (7) and
the non-drive end cover (17).
The mechanical shaft seals and the external lip seals are provided with oil from the shaft-seals oil reservoir (5). This
provides a barrier seal between the compression chamber (rotor housing) and the external atmosphere.