1. Product introduction
AAMA 501.1-2005 Standard Test Method For Water Penetration Of Windows,Curtain Walls And Doors Using Dynamic Pressure.
GB/T 15227-2007 Test method of air permeability, watertightness, wind load resistance performance　for curtain walls.
GB/T29907-2013 Test method for watertightness of curtain walls under dynamic wind pressure.

2. Main technical parameters
(1) testing principle
Use the propeller of the aircraft, the propeller of the ship or the high power axial flow fan as the air supply equipment,Outside the curtain wall specimen, blow air to the curtain wall at a certain speed，Creates a pressure that enables the main structural components and components to achieve the desired average deflection。At the same time outside the curtain wall specimen at a certain flow of water，Observe the leakage on the inside of the curtain wall specimen，Sometimes in order to meet the static pressure difference or deflection requirements，Ordinary centrifuge can be used as auxiliary air supply equipment。

This test requires that curtain wall specimens must be installed by external spray，All drain holes on test samples should be opened。When the auxiliary pressure supply device is not turned on，The hydrostatic chamber shall be opened to ensure a smooth flow with the atmospheric space in the laboratory；When the auxiliary pressure supply device is turned on，The wind pressure sustained by the specimen is the sum of the static pressure formed by auxiliary air supply and the dynamic pressure formed by propeller。

(2) Propeller fan system
AAMA 501.1-94 requirements,Establish the wind speed required to generate a particular pressure.The water spray system complies with ASTM E 331, part 7.Water was applied to the outside of the test sample,While dripping,Apply the specified dynamic pressure rapidly along the specified spray surface to maintain the pressure until the time required for the test.

Prior to the dynamic watertight test more aircraft engine direct drive, the operator in the cockpit to adjust the propeller speed.This way due to artificial regulation, speed is difficult to stabilize, resulting in wind speed fluctuations; The cab will block the wind, causing the wind speed to drop. Aviation fuel is harder to buy and more expensive.In view of a series of disadvantages caused by the use of aero-engine, we design a special frequency conversion motor as a power source.Using frequency converter to adjust the speed, the speed can be stable in any set value, can also change the frequency to form a fluctuating value; The motor is installed on the windward side and has a small cross-sectional area, which will not form a large block to the wind; Electricity is clean, pollution-free and cheap.

This equipment is composed of propeller fan, variable frequency motor, support, inverter control and other parts, which is used to test the watertight performance of building curtain wall, outer window and outer door under dynamic conditions.

a ——Pressure box;    b ——Air inlet baffle;  c ——Air flow meter；
d ——Pressure control device;    e ——Wind supply equipment;   f ——Differential pressure gauge;
g ——specimen;      h ——Install shelves;    i ——Water spray device;
j ——The water meter;    k ——Propeller fan;   l——Engine or motor;
m—stents