Covering and isolating ventilation fan

Abstract

The invention discloses a shielding type air exchange fan which comprises a frame of an air exchange fan, a motor arranged inside the frame and a fan blade driven by the motor; the frame is sleeved with a fan housing; a shielding device is arranged on the fan housing corresponding to the fan blade; the shielding device comprises a windshield blind arranged on the fan housing corresponding to the fan blade, a connecting rod which is connected with the windshield blind and is arranged in the fan housing and a traction mechanism for driving the connecting rod to move, wherein a damping buffer for buffering the closing speed or the opening speed of the windshield blind is arranged on the shielding device. The shielding type air exchange fan, through skillfully arranging the damping buffer on the shielding device, well controls the slow and sequential opening and closing of the windshield blind and effectively buffers resistance acting on the connecting rod, thereby realizing the slow opening and closing of the windshield blind noiselessly.

Description

Technical field: [0001] The invention relates to a commonly used shielding ventilating fan, in particular to a ventilating fan capable of buffering the closing or opening speed of windshield louvers and avoiding noise. The ventilating fan is widely used in display windows, bathrooms and other fields. Background technique: [0002] Most of the commonly used ventilating fans are ventilating fans with shielding mechanisms such as hoods. The hoods are set on the frame of the ventilating fan. The frame is equipped with a motor and fan blades driven by the motor to rotate, and a baffle is provided on the hood. Or the windshield louvers are used to separate the indoor and outdoor air after closing the ventilation fan. The wind-shielding louvers mainly include pull-type and wind-pressure type. The wind-pressure type is affected by the wind force of natural factors. When the wind-shielding louvers are opened and closed at a high speed, noise is generated; the pull-type needs manual o...

AI Technical Summary

Problems solved by technology

The wind-shielding louvers mainly include pull-type and wind-pressure type. The wind-pressure type is affected by the wind force of natural factors. When the wind-shielding louvers are opened and closed at a high speed, noise is generated; the pull-type needs manual operation to close the wind-shielding louvers, which cannot achieve Automated, humanized effect

The electric window type ventilation fan disclosed in Chinese patent ZL00240082.0, the ventilation fan realizes the opening and closing of the windshield louvers by the power on and off of the electromagnet assembly. The opening and closing of the windshield louvers are directly driven and controlled by the electromagnet assembly without any buffer device. The consequence of this is: when the power supply of the electromagnet assembly is turned on or off, the windshield louvers will be opened or closed quickly , the mechanism that the electromagnet assembly pushes the windshield louvers to move is relatively large, and every time the windshield louvers are opened or closed quickly, they will be subjected to strong shocks, which will reduce the service life of the windshield louvers, and replacing them with other materials will inevitably increase the In addition, when the windshield shutters are opened or closed quickly, there will be a loud sound, and the sound is fast and sudden, causing great nuisance to users

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