Hardware accessories: Doors and windows rely on hardware accessories to complete the opening and closing functions. It is the most easily worn and continuously active part of building doors and windows. Its functional effectiveness not only directly leads to safety problems, but also affects the insulation performance and watertightness of building doors and windows. Sex and airtightness. Without high-performance hardware accessories as guarantees, it is impossible to produce high-performance energy-saving doors and windows. Door and window hardware accessories include: handle, sliding support, support gear, handle, window lock, pulley and so on. For the casement window, classification according to the sealing performance can be roughly divided into two categories: multi-point hardware and single-point hardware. The lock points and lock seats of the multi-spot hardware are distributed around the entire door and window; when the doors and windows are locked, the lock points and the lock seats are firmly buckled together and cooperate with the hinges or the slide stays to jointly generate a strong seal pressing force. The sealing strip is elastically deformed so as to provide sufficient sealing performance for the door and window, so that the window sash and the window frame are integrated; and the single-spot sealing performance is relatively poor. Therefore, the use of multiple locks and window locks can greatly reduce the deformation of the door and window sash and improve the sealing performance. For other accessories, sliding hinges should be made of stainless steel. For sliding windows with a width of more than 1 meter, or doors with double glass installation, double pulleys or rolling pulleys should be used.
Optimize the sectional structure of the door and window frame profile. If there is no corresponding structural cooperation after the emergence of new materials, its role will be limited. The same material used in the structure is different, the difference in performance is very large, such as the use of multi-cavity heat insulation box, sealed with multiple seals and glass, accessories supporting, so that the K value significantly reduced.
From this, it can be seen that to increase the thermal resistance of the frame, it is necessary to increase the width of the heat insulation strip or the thickness of the heat insulation core connecting the inner and outer aluminum frames. In order to make the frame section compact, according to the principle of heat flow length, under the same width of the heat insulation strip, it can be designed as a “bow†shape. Since the length of the heat flow increases, the thermal resistance R is also increased, so that the K value is further reduced.
Multi-cavity heat insulation strip design was adopted to reduce the K value. Although widening the insulation strip can effectively reduce the K value, it can only be appropriately widened. If it is added too much, it will result in a structure that is not compact, and measures must be sought to increase the thermal resistance. According to the principle of heat conduction, the thermally conductive surface can be designed as a superimposed multi-cavity to increase the thermal resistance.
Widening the insulation strip filled with foam material and matching with a multi-head chamber seal to further reduce the K value. In order to lower the K value step by step, the heat insulation strips can be widened, and the foamed material can be filled. The multi-headed seal is used to form the cavity to match the performance.
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