Air exchange fan with automatic closed air inlet

Abstract

The invention provides an air exchange fan with an automatic closed air inlet. The air exchange fan can reliably close an air exchange port when it is in an idle state. The air exchange fan comprisesa framework-shaped fan body, several window blades, and an electromagnet. The middle of the fan body is provided with the air exchange port, a motor and a fan blade are installed in the air exchange port; one side of the fan body is provided with several rotating shafts for mounting the window blades, and the window blades can freely rotate around the rotating shaft; one side of each window bladedeviating from the rotating shaft is provided with a moving shaft in a protruding manner, the moving shafts of all window blades are connected with link rods; the end parts of the link rods are provided with guide rods perpendicular to the link rods in a protruding manner; the fan body is provided with an arc guide slot, and the end part of the guide rod is located in the guide slot; the radius ofthe guide slot is equal to the space between the rotating shafts and the moving shafts on the same window blade, the central angle of the guide slot is 90 degrees; the end parts of the link rods areprovided with magnets; the electromagnet is connected with a power source of the air exchange fan through AC / DC converting circuit; the electromagnet is installed on the fan body, and faced to the lower end part of the guide slot.

Description

technical field [0001] The invention relates to a ventilation fan. Background technique [0002] When the traditional ventilating fan is not working, the air on both sides of the ventilating fan can also circulate through the gap between the fan blades, so it cannot achieve the effect of blocking mosquitoes. More importantly, in winter, the ventilating fan in the bathroom becomes cold air. access, causing the temperature in the bathroom to be too low. In order to solve this problem, some ventilating fans have added the function of automatically closing the air inlet. The specific technical solution is to have louvers on the outside of the ventilating fan. The shutters of the louvers are installed on the rotating shaft. The window leaf of the louver is turned upwards to open the louver, and when ventilation is not needed, the self-gravity of the window leaf makes it turn downwards to close the air exchange port. The above-mentioned ventilating fan has the following problems...

AI Technical Summary

Problems solved by technology

The above-mentioned ventilating fan has the following problems. Because the gravity of the window leaf is small, when the external wind force is strong, the window leaf is easy to be blown open, losing the effect of closing the ventilation port, and under the action of the external air flow, the window leaf will repeatedly Turns on and off, making annoying noise

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