Door companies need to pay attention to the impact of hardware on air tightness

There are many types of door and window hardware that affect the sealing performance of doors and windows; according to the sealing performance of doors and windows, they can be roughly divided into two categories: multi-locking hardware and single-locking hardware. The role of door and window hardware on the airtightness of doors and windows should cause door and window companies to pay enough attention.

The locking points and lock seats of the multi-locking hardware are distributed around the doors and windows; when the doors and windows are locked, the locking points and lock seats are firmly buckled together and matched with the hinge (hinge) or sliding brace, Jointly produce a strong sealing pressing force to elastically deform the sealing strip, thereby providing sufficient sealing performance for doors and windows, so that the fan and frame are integrated; therefore, multi-locking hardware has many advantages for the sealing of doors and windows, which can greatly improve doors and windows. The sealing performance. The sealing performance of single locking point hardware is relatively worse. Because single locking point can only provide single-point locking on the opening side of the door and window, it can only produce 3, The four locking points cause four corners of the doors and windows to be in an unconstrained state. Therefore, the gap between the two unconstrained corners and the locking points seriously reduces the sealing performance of the doors and windows.

Take the lock point arrangement on the handle side as an example: set the window width to B, the window height to H, and the sash bending stiffness EI, which can be divided into three situations: single lock point, two lock points, and three lock points (lock point distance The fan edge is not less than 0.1mm), and the maximum deformation value of the handle side of the window sash in the sealing direction is given according to the mechanical formula.

It can be seen that the use of three locking points can greatly reduce the deformation of the door and window sash and improve the sealing performance.

Of course, under the condition of meeting the requirements of strength and sealing, it is not advisable to use too many locking points; otherwise it will cause waste.

Similarly, most of the hinges used in doors and windows need to cut off the sealant strips at the hinge position before they can be used; and this part is due to the impact on air tightness caused by the installation of the hinge Have you considered it? In fact, the negative effect of the gap penetration caused by the cutting off of the sealing tape on energy saving is basically ignored by everyone.