Traction Rolling Stock - Indian Railways Institute of Electrical ...

Number of stages : 2
Compressor speed : 980 rpm
Type of cooling : Air cooled provided with a fan
Direction of rotation : Anticlockwise as viewed from
non-driving end
Type of drive : Directly coupled with motor by a
bibby coupling
LP piston dia. : 100 mm
HP piston dia. : 60 mm
Stroke : 85 mm
Displacement : 1275 ltrs/min at 1000 rpm
LP Piston top to disc. valve clearance : 0.2 to 0.3 mm
HP piston top to cylinder top clearance : 1.1 to 1.2 mm
Recommended lubricants crank case lub. oil : Bharat Hydrol 150 (BPC)
Enklo
150 (HPC)
Servo press
150 (IOC)
Bibby coupling grease : Bharat Univex 'A' (BPC)
Wheel bearing grease (HPC)
Servo grease
MP(OC)
6.4 VACUUM EXHAUSTER
6.4.1 Description
Two nos. of vacuum exhauster installed in the locomotive are of rotary air cooled type.
They are designed for two speeds for operation with a normal running speed of 965 rpm and a
capacity of 4500 liters per minute each. At this speed, a 54 cm (21" Hg) vacuum would be
maintained against a leak of 7.95 mm diameter, for brake release purpose, the exhauster is run at
1460 rpm when the capacity is 7000 liters per minute and 54 cm (21" Hg) vacuum will be held
against a 12.6 mm diameter leak. The exhauster is capable of giving satisfactory continuous
operation at high speed as well as at low speed and able to sustain the effects of repeated
changeovers from rest to high speed direct and from low speed to high speed.
The driving motor of the exhauster is a three phase inductor motor with squirrel cage
rotor and star connected stator with two speed winding. The squirrel cage is of electrolytic copper
silver brazed to copper end rings. The frame of the motor conforms to IEC standards and is
provided with screen ed type enclosure. The motor is designed to operate on supply with 50 c/s,
415V (290-500V).
6.4.2. Technical Data
A) Exhauster: