1. The function of the
governor of diesel generator set
The function of the
governor is to adjust the fuel supply automatically with the change of the external
load of the diesel engine within the required speed range of the diesel engine,
so as to keep the diesel engine speed basically stable.
2. Type of governor
A. According to the
different classification of governor regulating mechanism, it can be divided
into four types: mechanical type, hydraulic type, pneumatic type and electronic
type.
(1) mechanical governor
The sensing element of
the mechanical governor is a flying block or a flying ball, which directly
pushes the actuator. Simple structure, reliable work, widely used in medium and
small power diesel engines.
(2) hydraulic speed
governor
The pressure governor
generally uses the flying block as an inductive element to push the piston to
operate the hydraulic server. This governor has small induction elements and
strong versatility. A few series of dimensions can be used to meet the requirements
of tens to ten thousand horsepower diesel engines. It has good stability, high
adjustment precision and large driving force, and is easy to realize automatic
control of diesel engine. But the structure is complex, the craft request is
high, suitable for the high power diesel engine.
(3) Pneumatic governor
The moving governor uses
the diaphragm to induce the change of the vacuum of the inlet pipe, and then to
promote the actuating mechanism. The governor has simple structure and high
sensitivity at low speed, but the power is decreased due to the throttle valve
installed in the intake pipe. Therefore, it is only suitable for low power
diesel engines.
(4) electronic governor
(Mainly used in electric generator engine)
The electronic governor
converts the change of diesel engine speed into the change of electric
quantity, and controls the actuator after sampling and amplifying. This
governor can adjust the fuel supply before the speed of diesel engine changes
obviously, and obtain high adjusting precision, and realize parallel operation
without difference.
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