AEG Electrolux EHG 679 B Instrucciones de operaciones descargar pdf (Pagina 4)

GA 01.202/9.02 - 03/96

The gas ballast valve is opened and closed by turning

the gas ballast knob (7/5) on the front.

To enable the TRIVAC-B to be used at intake pressures

as high as 1,000 mbar, a special lubricating system was

developed featuring force-lubrication of the sliding bea-

rings.

An oil pump (3/6) pumps the oil from the oil reservoir

(3/5) into a pressure-lubrication system which supplies

oil to all bearing points (3/2). From there the oil enters

the pump chamber area (2/6) of the vacuum pump.

The oil pump is fitted in the front end plate on the cou-

pling side of the pump module. The oil suction line is pla-

ced low, resulting in a large usable oil reservoir.

The oil is separated from the gas in the TRIVAC-B in two

steps as described above. First, small droplets are

coalesced into large drops in the internal demister (2/11)

fitted above the exhaust valve (2/10). Then, the large

drops fall into the oil reservoir as the exhaust gas is

diverted by the inner walls of the oil case. Thus a low

loss of oil is obtained. This and the large usable oil reser-

voir ensure long intervals between oil changes even at

high intake pressures.

The vacuum is maintained by the TRIVAC-B by an inte-

grated hydropneumatic anti-suckback valve (2/3) which

is controlled via the oil pressure.

Description

During operation of the TRIVAC-B the control piston

(4/3) remains sealed against a spring (4/2) by the oil

pressure. The valve disc (4/6) of the anti-suckback valve

is held at the lower position by its own weight (valve

open). When the pump stops (because it has been swit-

ched off or because of a failure), the oil pressure drops

and the spring (4/2) presses the control piston (4/3) up.

Thus a connection is provided between the oil case or

the oil reservoir (4/1) and the piston (4/4) of the anti-

suckback valve. Due to the pressure difference between

the oil case and the intake port the oil presses the piston

(4/4) up and the valve plate (4/6) against the valve seat

(4/5). The quantity of oil in the oil reservoir (4/1) prevents

the entry of air into the intake port (2/1) at the beginning

of this process.

After the oil has flowed out from the reservoir and when

the valve plate rests on the valve seat, air follows in,

which vents the pump chamber and forces the valve disc

(4/6) against its seat. This effectively prevents backstre-

aming of oil. The anti-suckback valve (2/3) operates

independently of the operating mode of the pump, i.e.

also with gas ballast.

Fig. 2 Sectional drawing of the TRIVAC-B

Key to Fig. 2

1 Intake port

2 Dirt trap

3 Anti-suckback valve

4 Intake channel

5 Vanes

6 Pump chamber

7 Rotor

8 Cover plate, connection for inert gas ballast

9 Exhaust channel

10 Exhaust valve

11 Internal demister

12 Spring buckles

13 Cover plate, connection for oil filter

1 2 3 4 5 6 7 8 9 ... 27 28

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