14-01-2014, 04:30 PM
UNIVERSAL GOVERNER APPARATUS WITH DIGITAL TACHOMETER
Aim:
To study with Universal Governer apparatus with digital tachometer
Apparatus:
Centrifugal governor
Description:
The function of a governor is to regulate the mean speed of an engine, when there are
variations in the load on an engine increases, its speed decreases, there it becomes necessary to
increase the supply of working fluid. On the other hand when the load on the engine decreases, its
speed increases and thus less working fluid is required. The governors automatically control the
supply of fluid to the engine with varying load conditions and keep the mean speed within certain
limits.
Centrifugal Governors:
The centrifugal governors are based on the balancing of centrifugal force on the
rotating balls by an equal and opposite force, known as controlling force. (The controlling force is
provided either by the action of gravity in Watt Governor or by a spring as in case of Hartnell
Governor). It consists of two balls of equal mass, which are attached to the arms. The balls are
known as Fly balls or Governor balls. The balls are revolving with a spindle. The upper ends of the
arms are pivoted to the spindle, so that the balls may rise up or fall down as they revolve about the
vertical axis. The arms are connected by the link to the sleeve, which is keyed to the spindle. This
sleeve revolves with the spindle; but can slide up and down. The balls and sleeve rises when the
spindle speed increases, and falls when the speed is decreases. The supply of working fluid decreases
when the sleeve rises and increases when it falls.