| | 1. Adopt N-shaped crankshaft 2. Flux of pump can be regulated under
both operating and still states, the precision achieves ±1%,
without any leakage 3. The pump head and power box are completely
separated, with reinforced cast iron gear box to ensure long
service life 4. Hydraulic drive diaphragm pump, double diaphragm
and diaphragm crack alarm are optional, service life of diaphragm
is no less than 8000 hours 5. PTFT compound material diaphragm,
with better anti-rot performance and longer service life 6.
Reasonable structure, reliable performance, stable operation,
convenient to regulate and simple to maintain. Main purpose JYMZ
series diaphragm metering pump is a kind of general mechanical
equipment, it can accord with process flow’s requirements, and can
quantitatively transport various liquids with stepless regulation
within the journey of 0～100%, besides, the metering precision of
transported medium at largest journey is ±1%. Flux range of
metering pump is 0.8～800L/h, it is applicable for transporting
mediums without solid granule whose temperature is -30～120℃,
viscidity is 0.3～800mm2/s. 2. Hydraulic end Structure principle of
hydraulic diaphragm type metering pump: Hydraulic diaphragm type
metering pump is made up of plunger, cylinder body, cylinder cover,
inlet and outlet valve, diaphragm as well as three valves
(deflation valve, limit valve and compensation valve). Hydraulic
oil and medium are separated when diaphragm is operating, so the
diaphragm metering pump has feature of never leak, and it is an
ideal tool for transporting flammable, explosive, volatile,
strong-corrosive, radiative, virulent as well as expensive mediums.
The plunger at the hydraulic end of hydraulic diaphragm type
metering pump is driven by to-and-fro movement of crank rod
connecting mechanism. The plunger carries out to-and-fro movement
in hydraulic cavity to change the pressure of hydraulic oil, and to
transport mediums through diaphragm’s flex displacement. Relative
stability of hydraulic oil in the cavity is maintained by the
function of three valves. Deflation safety can eliminate gases in
hydraulic cavity to guarantee stability of operation, it avoids the
bad effect of automatic opening and oil discharging because of over
hydraulic oil as well as over pressure, which is caused by drainage
pipeline’s block. Inhibiting compensation device regulates opening
degree of limit valve by virtue of diaphragm, oil is fed at any
moment according to vacuum degree of hydraulic cavity in order to
ensure hydraulic oil level in the cavity. Installation
requirements: 1. Pump should be installed on specially spare
concrete base or cast iron platform, then it is fixed with fang
bolt after regulating. The concrete base should be 50～100mm higher
than the ground. 2. Diameters of suction and discharge pipelines
should not be less than that of inlet and outlet pipelines,
besides, the suction pipeline should be shortened as much as
possible. If the suction pipeline is over long or siphon joint is
too much, it should be carried out NPSHa calculation to meet the
needs of necessary net positive suction head. 3. Measuring meter
should be installed on connecting pipeline, such as manometer
(provided by users). 4. Filter device should be installed at the
end of suction pipeline (provided by users). 5. Safety valve or
safety overflow valve (provided by users) should be installed on
discharge valve. If impulse of outlet pressure should be reduced,
stabilized pressure device can be equipped near discharge pipeline.
6. According to using condition, electrical control equipment
should be installed at the working site of pump, besides, it should
be equipped with protection device of control switch that
corresponds with transported mediums, so as to ensure safety. 7.
Combine pump (plunger type or diaphragm type), to the combination
with same pedestal and same specification, equip tube according to
flow’s pressure grade, take motor as basic point to begin, pressure
is ranked from high to low; while to the combination with different
pedestal and different specification, it has already installed from
large to small, what users should do is to equip tube and connect.
8. Other technical requirements of pump’s installation should
accord with related rules of TJ231 (five) -78. | |
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