Abstract: In order to be able to clarify the comprehensive performance of the fire exhaust fan, we need to test the performance
parameters of the fire exhaust fan according to national standards. On the basis of meeting the test safety, analyze and design a
comprehensive performance test platform for the fire exhaust fan Design scheme. The article describes the performance parameters of
the fire exhaust fan and the measurement method of the performance parameters, analyzes the design plan of the comprehensive
performance test platform of the fire exhaust fan, and aims to guide the comprehensive performance test of the fire exhaust fan
significance.
Motexo: fire exhaust fan; comprehensive performance; test platform
The most common way to eliminate smoke from a fire site is to use a smoke exhaust
fan to exhaust smoke. The fire exhaust fan can not only deliver fresh air or remove
indoor smoke, but also dilute toxic gases and exhaust smoke in a variety of disaster
situations.
Poisons, etc., are very important in the smoke prevention and exhaust system. As a
fire protection product, the performance and stability of fire exhaust fans are directly
related to the fire scene
The effectiveness of smoke exhaust even affects the safety of life and property at the
fire site. Therefore, we need to build a performance test platform for fire smoke
exhaust fans to make fire smoke exhaust air.
The machine exerts its powerful fire protection function to remove smoke.
1 Overview of the comprehensive performance test platform for fire-fighting exhaust
fans
1.1 Performance parameters of fire-fighting exhaust fans The most basic
comprehensive performance of fire-fighting exhaust fans, including air volume, wind
pressure, power, efficiency, noise, effective value of vibration speed, etc. Air volume
refers to the exhaust fan in the single
The volume of the gas transferred within the time; the wind pressure is also divided
into total pressure, dynamic pressure and static pressure. The total pressure refers to
the energy obtained by the exhaust fan in a unit volume. The size of the wind pressure
can be
The distance between the air supply and exhaust air of the exhaust fan appears; the
input power of the exhaust fan refers to
It is the energy obtained from the prime mover by the rotating shaft of the exhaust fan
in unit time [1]. The fire exhaust fan is in a high temperature environment during war,
so the fire exhaust fan needs to have
Good high temperature resistance, GA211 stipulates that the fire smoke exhaust fan
shall not be lower than 280℃ airflow
There is no abnormal phenomenon in continuous operation for 30 minutes when
passing.
1.2 Test of fan performance parameters
According to GB 1236 "Industrial ventilators with standardized air ducts for
performance tests", GB /T 2888 "Fan and Roots blowers noise test methods", JB /T 8690
"Industrial ventilators noise limits", JB /T 8689 "Ventilation Machine Vibration
Detection and Limits" test standard, combined with the company's test site, test
equipment, economy and other principles, the exhaust air chamber test device in the GB
1236 standard is selected to test the comprehensive performance of the fire exhaust fan.
2. Design scheme of comprehensive performance test platform for fire exhaust fan
When the fire exhaust fan is working, after the air or flue gas is accelerated by the fan
impeller and flows through the pipe, it will inevitably encounter various flow
resistances and cause energy loss. Due to the complexity of flow, these energy losses
cannot be accurately calculated theoretically.
Therefore, it is impossible to theoretically obtain the actual wind pressure value.
Therefore, it is necessary to measure the overall performance of the fan at a specific
speed through a comprehensive performance test device for the fire exhaust fan.
Pressure-flow (Pt-Q), static pressure-flow (Pst-Q), power-flow (N-Q), efficiency
The relationship between rate-flow (η-Q) and static pressure-efficiency (ηst-Q), that is,
the characteristic curve, is also an extremely important item in the comprehensive
performance test. For this purpose, the relevant test data is collected and recorded
according to requirements during the test, and the data is processed by the test
software.To generate a characteristic curve.The comprehensive performance test device
of the fire exhaust fan is composed of the test device body and the adjustment
Valves, auxiliary fans, sensors (atmospheric pressure, temperature and humidity,
differential pressure, speed, current and voltage, input power, noise, vibration),
industrial computer and data acquisition system.
2.1 Control valve
The purpose is to adjust the resistance of the system pipe network,
requiring electric adjustment, the adjustment range is 0-90°,
the repeatability is good, and the console is operated in real time.
2.2 Auxiliary fan
In order to overcome the resistance of the pipeline of the test device, the auxiliary fan is
controlled by the console to control the frequency conversion device, and the working
frequency of the auxiliary fan is controlled to achieve the accuracy of static pressure.
Position and adjust the inlet pressure to obtain the performance
curve of the fan under all working conditions.
2.3 Sensor
The data is collected in real time by an industrial computer using
precision sensors to avoid human error and ensure the accuracy of the
collected data.
(1) Flow and pressure measurement. Measure the static pressure of
the air chamber and the pressure difference between the front and rear of
the nozzle, and use the pressure transmitter to output the signal to the
industrial computer.
(2) Electrical parameter measurement. Three-phase three (four, five)
wire system electrical parameter comprehensive measuring instrument,
voltage, current and power factor and other data display, and output
signals to the industrial computer.
(3) Speed measurement. The photoelectric speed sensor
measures the fan speed and outputs a signal to the industrial computer.
(4) Temperature and humidity measurement. The temperature and
humidity sensor and transmitter are designed as an integrated instrument
to measure, and output signals to the industrial computer.
(5) Atmospheric pressure measurement. It is measured with an
absolute pressure transmitter and outputs the signal to the industrial
computer.
(6) Noise measurement. Measure A sound level is to transfer the signal
of the noise sensor to the industrial computer
。
(
7) Vibration measurement. The vibration speed sensor of the measuring fan
is directly adsorbed at the measuring point of the measured fan, and
outputs the signal to the industrial computer.
2.4 Industrial computer and data acquisition system
The industrial control machine is adopted, and the computer and the template are
connected through a signal line, and it is equipped with a multi-task serial
communication card. The data acquisition system saves the collected data and passes
The data is automatically processed and calculated, converted into standard condition
data, and a test report is generated. It can also synthesize and compare multiple fan
curves. The advantages and disadvantages of the fans are clear at a glance.
Machine product design improvement provides clear guidance.
3 Conclusion
According to the comprehensive performance test requirements of the fire exhaust
fan, and according to the national standard, the comprehensive performance test
platform is designed, which meets the national standard GB1236 "For industrial fans
The requirements of the "Standardized Air Duct for Performance Test" further clarify
the main performance parameters and measurement methods of the fire smoke
exhaust fan, and obtain accurate fire smoke exhaust
The comprehensive performance data of the fan provides reliable basis for the
manufacturer's optimal design and accurate selection by the design institute, and
provides reliable data support for the user's fan renovation, energy saving,
environmental protection and economic operation.
The comprehensive performance test of the fire exhaust fan realizes the function of
automatic collection, avoiding people
For error, to ensure the accuracy of the collected data, the test accuracy and
repeatability are not lower than
3%, the comprehensive performance parameters of the measured fire exhaust fan
products include air volume, wind pressure, power, efficiency, noise, and effective
value of vibration speed, etc., and the test data can be compared to determine the
performance of the fire exhaust fan. We also need to intensify research and develop
more convenient and effective detection methods, so as to provide firefighters with a
more powerful guarantee for fire protection in the rescue of the fire scene.
