AEG Electrolux EHG 679 B Betriebsanleitung PDF herunterladen (Seite 3)

GA 01.202/9.02 - 03/96

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Description

1 Description

TRIVAC-B pumps are oil-sealed rotary vane pumps. The

TRIVAC S16 B and S 25 B are single-stage pumps, and

the TRIVAC D16 B and D 25 B are dual-stage pumps.

The number in the type designation (16 or 25) indicates

the pumping speed in m

· h

-1

TRIVAC-B pumps can pump gases and vapours and

evacuate vessels or vacuum systems in the fine vacuum

range. Those of standard design are not suitable for

pumping greater than atmospheric concentrations of

oxygen, hazardous gases, or extremely aggressive or

corrosive media.

The drive motor of the TRIVAC-B is directly flanged to

the pump at the coupling housing. The pump and motor

shafts are directly connected by a flexible coupling. The

bearing points of the pump module are force lubricated

sliding bearings. All controls as well as the oil-level glass

and the nameplate are arranged on the front. All connec-

tions are to be found at the sides of the pump. The oil-

level glass is provided with prisms for better observation

of the oil level.

The pump module consists of assembly parts which are

pin-fitted so as to allow easy disassembly and reassem-

bly. The pump module can be easily removed without

special tools.

1.1 Function

The rotor (2/7), mounted eccentrically in the pump hou-

sing (2/6), has two radially sliding vanes (2/5) which divi-

de the pump chamber into several compartments. The

volume of each compartment changes periodically with

the rotation of the rotor.

As a result, gas is sucked in at the intake port (2/1). The

gas passes through the dirt trap sieve (2/2), flows past

the open anti-suckback valve (2/3) and then enters the

pump chamber (2/6). In the pump chamber, the gas is

passed on and compressed, after the inlet aperture is

closed by the vane.

The oil injected into the pump chamber is used for sea-

ling and lubricating. The slap noise of the oil in the pump

which usually occurs when attaining the ultimate pressu-

re is prevented by admitting a very small amount of air

into the pump chamber.

The compressed gas in the pump chamber is ejected

through the exhaust valve (2/10). The oil entrained in the

gas is coarsely trapped in the internal demister (2/11);

there the oil is also freed of mechanical impurities. The

gas leaves the TRIVAC-B through the exhaust port.

During compression, a controlled amount of air - the so-

called gas ballast - can be allowed to enter the pump

chamber by opening the gas ballast valve. The gas bal-

last stops condensation of vapours in the pump chamber

up to the limit of water vapour tolerance as specified in

the technical data for the pump.

Key to Fig. 1

1 Oil filter OF 4-25

2 Exhaust filter AF 16-25

3 Condensate trap AK 16-25

Fig. 1 TRIVAC-B with accessories

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

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