Range hood air performance test bench

One Overview

The air performance test device for range hoods is a wind measurement system developed and manufactured according to standards such as GB/T 17713-2011 "Range hoods" and GB/T14806-2003 "AC ventilators and their speed controllers for household and similar use". This air performance test device is mainly designed for the "Exhaust Range Hood Air Performance Test Device" in Appendix C of GB/T17713-2011 "Range Hood" standard. This device can only be used for testing "Exhaust Range Hood" and cannot be used for testing "Circulating Range Hood".

The basic testing principle is to simulate the actual working state of the test specimen in the testing wind tunnel, change the diameter of the orifice plate at the air outlet, and then measure the static pressure value at each air outlet. Then, the corresponding flow coefficient and air volume parameters are calculated using standard formulas.

The device adopts a computer automatic measurement and control method, which only requires manual installation of the test sample and replacement of the orifice plate. The entire process of testing one test sample only takes ten minutes. It can measure the corresponding curves of static pressure and air volume, air volume and speed, current, power, efficiency, etc. It has the characteristics of convenience, speed, stability, reliability, and good reproducibility. Satisfy the testing and use of related products in scientific research and production processes.

1. Product name: Range hood air performance testing device

2. Model specifications: DMS customization

3. Standard basis: GB/T 17713-2011, GB/T14806-2003 and other relevant product standards.

4. Applicable products: range hood, ducted ventilator, air supply fan, etc.

5. Performance and feature requirements:

1) Automated testing, calculation, and data output are achieved through computers and their peripheral devices, with graphical display and printing of test results. The human-machine dialogue operation is simple, with high accuracy, saving time and effort.

2) Test items: P-Q characteristics (relationship between flow rate and static pressure), Q - η characteristics (relationship between flow rate and efficiency), synchronous measurement of the rotational speed, current, and power of the tested object.

III Main technical parameters and indicators

1. Laboratory power supply: AC 220V/AC 50HZ; capacity: 2KVA

2. Laboratory environment: 20 ℃± 5 ℃ Humidity: 30% -80% Atmospheric pressure: Normal

3. Measurement range of air volume: (1.0m3-25m3)/min

4. Static pressure: 0-1250Pa ± 0.2% Pa

5. Electrical parameters: The measurement accuracy of voltage, current, and power is level 0.5, with digital display instruments

Range: Voltage AC 0-300V

Current AC 0-5A

Power range 0-1000W

6. Speed: 0-19999 revolutions per minute ± 5RPM digital display

7. Air temperature and humidity: -10-100 ℃± 0.5 ℃, (5-99)% R · H ± 5%

8. Variable frequency stabilized power supply:

Input voltage: AC 220V 50HZ

Output voltage: AC 0-110V-220V -300V continuously adjustable, ≤ 1%

Output frequency: 50HZ or 60HZ

Output power: 0-1000W

4、 The testing items of this experimental device;

1) Static pressure measured inside the pressure reducing cylinder: Ps6 (Pa)

2) Environmental atmospheric pressure: Pba (Pa)

3) Environmental temperature: θ a (℃)

4) Input power: P (W)

5) Working voltage: V

6) Working current: A

7) Operating frequency: Hz

5、 Operating condition testing, testing and calculation items for 18 throttle orifice plates;

1) Static pressure measured inside the pressure reducing cylinder: Ps6 (Pa)

2) Input power: P (W)

3) Airflow under test conditions: Qv (m3/s)

4) Total pressure under test conditions: Pfb (Pa)

5) Total pressure of air standard state: Pfbn (Pa)

6) Static pressure under test conditions: Ps2n (pa)

7) Total pressure efficiency under test conditions: η (%)

6、 The measurement results automatically calculated by the computer after the test is completed;

1) Maximum static pressure (static pressure value at zero air volume): Ps2n (max) Pa

2) Maximum airflow (airflow value at zero static pressure): Qv (max) m3/min

3) Static pressure at specified air volume (7m3/min): Ps2ns Pa

4) Main motor input power at specified air volume (7m3/min): P W

5) Total pressure efficiency at specified air volume (7m3/min): η%

6) After the measurement is completed, the corresponding curves of static pressure and air volume, air volume and speed, current, power, efficiency, etc. can be automatically measured.

7、 Test object;

The measurement object is an external exhaust range hood with air outlet diameters of 150mm, 160mm, 170mm, and 180mm (note: cannot be used for testing "circulating range hoods").

8、 Composition of experimental equipment;

1) One set of conical fume hood and framework (approximately 3.2x1.2x0.6M in length, width, and height).

2) Electric control cabinet

2) 19 throttle orifice plates and 1 orifice plate transition plate.

3) One sample installation lifting platform and four connectors.

4) One connector each for 150mm, 160mm, 170mm, and 180mm.

9、 Summary of testing scope for each parameter

Project Unit Range Accuracy Airflow m3/min 1.0-25 ± 2% Maximum Airflow for Each Nozzle Static Pressure Pa0~1250 ± 0.2% RPM 0~19999 ± 5 RPM Current A0~20 ± 0.5% Voltage V0~300 ± 0.5% Power W0~1000 ± 0.5% Temperature ℃ -10~100 ± 0.5 ℃ Humidity% 5~99 ± 5% Air Pressure h Pa940~1060 ± 2 h Pa 10, Device Composition Requirements

The experimental setup consists of three main parts: a conical fume hood, 18 orifice plates, a control cabinet, a sample lifting platform, and a computer calculation system.

1) Cone shaped fume hood cone and frame

Size not exceeding: length 3200mm x width 600mm x height 1200mm

Weight not exceeding: 80kg

2) Throttle orifice plate (18 pieces)

18 throttle orifice plates and one orifice transition plate. The orifice plate needs to be manually replaced.

3) Control cabinet

The control cabinet should include: variable frequency power supply, pressure transmitter, current voltage power meter, atmospheric pressure gauge, environmental temperature and humidity meter, programmable controller, etc

4) Sample lifting platform

Weight capacity: 40kg

Lifting height: 800mm-1200mm

5) Computer calculation system

① The software program used is provided by loading it into the CPU.

The operating system is Windows XP. The software language is Visual Basic.

Computers and peripheral devices: mainframe, display screen, printer

② Functional requirements for software

Execute programs through human-machine dialogue.

☆ Enter the specifications and test conditions of the tested fan using the keyboard.

When automatically measuring pressure and air volume, use the keyboard to input the selected number of measurement points.

After the test is completed, the measured values and basic data can be saved on any disk.

After the test is completed, the printer prints out the measured data and characteristic curve.

The performance curve is plotted using the cubic spline interpolation method.

☆ It has the function of automatically adjusting the coordinate ratio of the performance curve screen. Make the visual representation clearer and more reasonable.

The unit of air volume for measurement can be m3/min or m3/h.

On the same graph, the composite curves of each test item can be depicted

The recognition of synthetic curves is distinguished by six symbols: ○, □, ×, △, ◇, and ◎. In addition, the model of the fan is also indicated on the diagram along with the identification symbol.

③ Measurement value, keyboard input value, calculated value

☆ Volume flow calculation value

☆ Static pressure measurement value

☆ Speed measurement value

☆ Current measurement value

☆ Efficiency calculation value