M-17
WG972-E2, DF972-E2, WSM
GASOLINE / LPG ENGINE
[4] VAPORIZER (DF972-E2)
Vaporizer is a device which converts the liquid fuel
into the gaseous fuel and the following structures and
functions are possessed.
■ Primary Chamber
The liquid fuel is decompressed (the first
decompression) and it is evaporated.
■ Secondary Chamber
The fuel which flows in is decompressed from the
primary chamber to the vicinity of the atmospheric
pressure further (the second decompression).
■ Water Passage
The coolant of the engine is made to circulate as a
heat source to evaporate the LPG.
■ Vacuum Lock Chamber
When the engine stops, the fuel from primary
chamber is prevented from flowing out.
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■ Primary Chamber
The liquid fuel which pushes the primary valve (6)
open passes between the valve and the valve seat (7),
enters primary chamber (1), and decompresses and is
evaporated.
When the inflow of the fuel continues and the primary
chamber pressure rises more than the specified
pressure 32.7 kPa (0.3 kgf/cm
2
, 4.3 psi), the tension in
the diaphragm spring (3) is overcome and do the push up
of primary diaphragm (4).
At this time, do the push up of primary valve lever
spring (2) of primary valve lever (5), primary valve (6) is
shut, and the inflow of the fuel is intercepted.
The tension in the diaphragm spring (3) grows more
than the primary chamber pressure when the fuel is
consumed and the primary chamber pressure lowers
more than a regulated value and a primary diaphragm is
depressed below.
The primary valve lever (5) is depressed at the same
time.
A primary valve opens and the fuel flows in again.
When the diaphragm tears by any chance and the
fuel flows in the primary diaphragm spring side, the
primary diaphragm spring side is connected with second
chamber in the balance passage so that the fuel should
not flow out outside.
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(1) Secondary Chamber
(2) Water Passage
(3) Primary Chamber
(4) Vacuum Lock Chamber
(1) Primary Chamber
(2) Primary Valve Lever Spring
(3) Primary Diaphragm Spring
(4) Primary Diaphragm
(5) Primary Valve Lever
(6) Primary Valve
(7) Valve Seat
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