The state promulgated the national law "Energy Conservation Law", which is the national energy conservation law in my country, and then successively promulgated a number of design standards and technical specifications for building energy conservation. The introduction of all these standards and specifications indicates that environmentally friendly and energy-saving products will become the direction of future development. As the main body of the construction industry, doors and windows must also meet the needs of this era.

 

　　Products are the source of enterprise survival, and quality is the life of an enterprise. Below, the author will discuss with you the problems and experience in the process of quality supervision and inspection of doors and windows, how to improve the airtightness, watertightness and wind pressure resistance of doors and windows. physical properties.

 

　　Improve the air tightness of doors and windows

 

　　The airtight performance of doors and windows refers to the amount of air infiltration per unit opening seam length or unit area of ​​doors and windows. It evaluates the ability of doors and windows to prevent air infiltration when the doors and windows are closed. The air tightness of doors and windows has a great influence on the loss of heat. The better the air tightness, the less heat exchange and the smaller the impact on room temperature. Therefore, improving the airtight performance of doors and windows is the key to energy saving of doors and windows. A quarter of the energy we use for heating in winter or cooling through air conditioning in summer is consumed through gaps in doors and windows. Therefore, the top priority to improve the airtight performance of doors and windows is to reduce the gap between the door and window frame and the fan and between the fan and the fan.​​

 

　　Improve the water tightness of doors and windows

 

　　GB/T7106-2008 clearly stipulates: when determining the classification index value of watertightness performance of doors and windows, record the serious leakage pressure difference of each test piece, and use the previous detection pressure difference of the serious leakage pressure difference as the watertightness value of the test piece A measure of performance. It is not difficult to find that there are two intuitive ways to improve the watertight performance of doors and windows by analyzing the requirements of the standard and the literal meaning: one is to let the rainwater as little as possible on the doors and windows when it rains, and then you can only press the protective cover on the top of the doors and windows. The rainwater performance of the doors and windows has not been changed at all, but the amount of rain on the doors and windows is smaller under the same amount of rainfall. It seems that the rainwater performance has improved, but this virtually increases the investment cost. This method is also relatively common, more common in small towns and rural areas, and is often used on doors. It is both waterproof and sunscreen. The second is how to let the rainwater drain out of the lower frame as soon as possible after the rainwater hits the doors and windows, thereby reducing the chance of leakage to the inside of the house. This is a method that I highly recommend, that is, to optimize the section structure of the door and window frame profiles. We all know that PVC plastic door and window frames are generally flat on the inside and outside, shaped like a U. The rainwater measure adopted is to leave several drainage channels on the window frame and sash, so that the water immersed in the frame and sash is discharged to the outside. The disadvantage of this method is that in the case of sudden rain or heavy rain, the rain cannot be discharged in time, so that it flows into people or splashes into the room. Imagine if the outer side of the lower frame of the door and window is significantly lower than the inner side, like an L, the rainwater has not yet had time to flow into the room and has been discharged through the outside, which can greatly improve the rainwater performance of the doors and windows. This is the reason why the rainwater performance of aluminum alloy doors and windows is significantly better than that of PVC plastic doors and windows. The same material uses different structural types, which may vary greatly in performance. The third situation is that rainwater flows into the room through the gap between the door and window frame and the wall. This is related to the installation process. The reason is that when the outer frame and the wall are reinforced once, they are both thermally expanded and contracted due to the principle of thermal expansion and contraction. There are gaps or cracks between them. The simple method is to fill the gaps with secondary reinforcement, and the problem is solved.

 

　　Improve the wind pressure resistance of doors and windows

 

　　We know that the wind pressure resistance performance is actually the wind pressure value when the force-bearing member of the door and window under the action of external force reaches the specified deformation value, that is, the deflection value. Under a certain pressure or strength, the smaller the deflection value of the force-bearing rod of the door and window, the better the wind pressure resistance of the product. Under the guidance of this principle, we must come up with ways to improve the wind pressure resistance of doors and windows.