I. Explanation of Performance Tests
The main performance items of the blower are tested in the manufacturer, and the measurements of flow, air flow, pressure, shaft power and noise under the test conditions (intake temperature, atmospheric pressure, rotational speed, etc.) at that time are converted into the rated conditions to measure the specified temperature, gas density, intake pressure, rotational speed, etc.
Its performance tests are based on the following criteria: GB/T, l236-1985 Aerodynamic Performance Test Method for blowers, JB/T 3165-1982 (Thermodynamic Performance Test for Centrifugal and Axial Flow Blowers and Compressors), ZB/J 72031-1989 "Performance Test Method for Roots Blowers for General Purpose" (Only Applicable to Specific Conditions), GB/T 1236-2000 (Industrial Opening) Standardized duct for blower performance test) and JB/T 8941.2-1999 Energy Test Method for Roots Blower for General Purpose.
The main items of measurement are:
1. traffic
1) Measuring by throttle orifice or Pitot tube.
2) Side measuring pipes are used to measure the current collector, orifice plate or Pitot tube.
The measured values of these devices can be calculated by using the formulas determined separately.
Moreover, the air volume of the blower refers to the intake air volume, which should be converted to the intake side when measuring at the outlet side.
2, pressure
Pressure is still in use with the device mentioned above, and static pressure tube (U-shaped pressure gauge)
Measurements are made by means of measuring holes oriented perpendicular to the direction of gas flow. In blowers, U-shaped pressure gauges usually use liquids such as water or mercury.
3. axis power
The input power of the motor is measured by a power meter. The output power of the motor is converted from the efficiency curve of the motor, and the shaft power is calculated.
4. noise
The noise of the inlet center is measured by the indicator noise meter according to the rated state of the blower or the state close to it.
These measuring points are obtained by throttling device used in throttling test. Generally, more than 7 points are measured, of which 2 points are located before and after the most specified points.
II. Performance Curve
As measured by
test leads curves of air volume, pressure, shaft power and efficiency obtained from performance test are expressed on the curves, which represent the performance of the blower, so they are called performance curves.
