• Motexo Industries

Design and Analysis of Comprehensive Performance Test Platform for Fire Exhaust Fan

Updated: Oct 6

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.

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