Compared
with the traditional application of emergency power generation equipment and
power distribution system to power the electric pump, the diesel engine is used
to directly drive the fire pump and trash pump. The application in the fire
protection field has unparalleled superiority. With the promotion of various
high-tech, The change of design concept has promoted the use of diesel engine
fire pumps in high-speed development of technical performance and application
quantity, especially in modern high-rise buildings, industrial areas,
residential areas, etc. The article further promotes the application of the
fire fighting field to the diesel engine fire pump through the discussion of
the new technical characteristics of the engine driven water pump.
Key
words
Trailer
mounted pump intelligent automation head flow rate
1.
Status of diesel engine irrigation pump
1.1
defects in the old-fashioned emergency fire protection system
1.1.1
The high-power diesel generator is used as the emergency generator set, and the
power transmission and distribution system, the electric control cabinet and
the dual-channel power conversion system are equipped to distribute the
electric pump. The system is complex and difficult to maintain.
1.1.2
Many fires are caused by electrical system failures. The fire distribution
system may have failed in the fire alarm system, or the fire has destroyed the
power distribution facilities, resulting in the fire protection system being
unable to work.
1.1.3
Equipment installation area is large, and capital construction investment is
large.
1.2
Advantages of diesel dewatering pump
1.2.1
The power capacity of the relative power is greatly reduced, the system is
simple, and the maintenance is convenient.
1.2.2
System independence, reliability is greatly improved.
1.2.3
Small size, the total investment is also greatly reduced.
1.3
Control method and development direction of diesel engine irrigation pump
1.3.1
manual type
Manual
start, manual speed control, manual monitoring.
1.3.2
ordinary automatic type
Acceptable
fire signal self-starting, with basic protection (over temperature, over speed,
under lubrication). The engine adopts mechanical speed regulation and starts at
full speed. The static speed regulation rate is 5%~10%, and the dynamic speed
adjustment speed is 10%~30%.
1.3.3
Advanced Auto Type
Acceptable
fire signal self-starting or manual operation, with basic engine protection
(over-temperature, over-speed, under-lubrication) using electronic speed
control, idle speed / full speed selection, static adjustment rate can be 0,
dynamic speed control rate is 3%~ 7%.
1.3.4
Intelligent
With
manual, automatic, network remote control, automatic inspection and automatic
fault diagnosis function, it can complete comprehensive state detection and
running performance test separately with the central fire protection system,
and start the operation process intelligent control - by microcomputer
(hardware special chip for curing program) The electronic speed regulation of
the command realizes soft start and soft rise speed, and has excellent static
and dynamic speed regulation characteristics. The system can comprehensively monitor
the engine's operating parameters and automatically diagnose the engine's
faults, as well as monitor the pump's head, flow and power, so that the pump
set can be reliably and comprehensively monitored. The intelligent system is
not only fully functional, but also manufactured by a dedicated module, so it
is small in size, high in reliability, and low in cost. It is the future
direction of trailer mounted pump development.
2.
High-tech application of diesel trash pump
2.1
Intelligent monitoring of the engine
2.1.1
Control function
2.1.2
The control system should have a fully automated control design, with control
modes such as manual control, automatic program control, remote control, and
forced start.
2.1.3
can set various process control time of diesel engine, including - preheating
or pre-lubrication time before start, start delay time, start limit time, start
motor off speed, idle speed delay, soft speed increase process delay Time, idle
cooling shutdown delay, etc.
2.1.4
The rated speed value of the diesel engine can be arbitrarily set according to
the need (because the user can change the engine speed to meet the requirements
of the head and flow), and the speed of the engine during the start, idle
speed, speed increase, full speed and other processes can be automatically
monitored. Automatically complete the input and withdrawal of the starter motor
(Intelligent judgment is caused by the start-up failure caused by the start-up
motor and the start of the flywheel slip during the start-up process, or the
start-up process is normal and the start-up fails. The former should
immediately exit the start-up motor and try again after a while. Start, so as
not to damage the starting gear and other components, the latter allows continuous
start within a limited time, if a single start is unsuccessful, multiple
times), too high speed and too low pre-alarm and over-limit shutdown.
2.1.5
The alarm limit value can be set, and the items of pre-alarm such as over-limit
pre-alarm (no stop), alarm and automatic stop at the same time should be
included - overspeed, low speed, low lubricating oil pressure, high cooling
temperature, low temperature ( Below 4°C anti-icing), low fuel level, low water
level, low battery voltage, high battery voltage, uncalibrated speed signal,
over-flow, etc.; items that automatically alarm and stop should include – no
speed signal (start speed) Low, speed sensor failure, start motor slip),
overspeed, low speed, low lube pressure, high cooling temperature, start failure,
shutdown failure, oil pressure sensor open/short circuit, water temperature
sensor open/short circuit, speed sensor open/short, flow Too big and
overloaded.
2.2
display function
2.2.1
Diesel engine operating status display—According to the current actual
situation of the system, the current state of the equipment is
displayed—waiting, starting, fueling, starting, starting delay, idle delay,
normal operation, cooling shutdown, emergency shutdown.
2.2.2
Pump group operation parameter measurement display—In the system operation
process, the current relevant parameter values are displayed—speed, running time, fuel inventory,
battery voltage, cooling temperature, lubricant pressure, pump outlet pressure,
pump flow.
2.2.3
Pump group alarm status display - When the system has a fault alarm, the panel
can display the fault that occurred, indicating the type of alarm (pre-alarm or
alarm) and the cause of the alarm.
2.2.4
Pump group parameter setting display, display the current parameter values of the system settings, including: start/stop
process delay state setting value, running speed control setting value and all
alarm and warning parameter setting values.
2.2.5
Remote network monitoring function - Through the fire network communication
system (or building automation system) to complete the system's tour detection
(similar to the sense of temperature, smoke detection). It can control the unit
to start/stop and analyze and archive its operating parameters. Because the
fire protection system is usually in standby state for a long time, daily
maintenance, maintenance, and system inspection are very important. The system
can automatically test the standby state of the unit, timely pre-alarm, and
ensure that the battery is in a good state.
2.3
Product features and advancement
To
realize the automatic control and monitoring functions of the system, there are
many parameters that need to be processed and controlled. It is impossible to
implement data acquisition and logic control circuits composed of ordinary
relays or discrete electronic components. Therefore, two systems are usually
used internationally: 1 dedicated control module; 2 programmable controller. At
present, it is common to use programmable controller (plc) for multi-channel
analog (sensor → transmitter), switch data acquisition
and control (using plc: fast, can change the program at any time, easy to
expand, but the system is still More complicated, and must be debugged by
professional engineers, the price is relatively high).
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