Fireproof air exhaust duct inlet voltage transformation flow guide device

Abstract

The invention relates to an air exhaust duct inlet flow guide device, and discloses a fireproof air exhaust duct inlet voltage transformation flow guide device which comprises a fireproof stop valve (2) arranged on an air exhaust duct, a flow guide plate device (9) as well as a right wing plate (51) and a left wing plate (52); the fireproof stop valve (2) is connected with an outer wall of the air exhaust duct (1) through a connecting panel; the flow guide plate device (9), an inner wall of the air exhaust duct (1), the right wing plate (51) and the left wing plate (52) form a ventilating pipeline which is sealed in periphery and runs through from top to bottom. According to the invention, when a range hood is opened, a valve sheet of the fireproof stop valve and the flow guide plate device are pushed away through wind force and pressure, thus the flow guide plate rotates into a flow guide form, which is beneficial to flue gas discharge; and after the range hood is closed, the valve sheet is closed, a back flow guide plate of the flow guide device is parallel to the air exhaust duct, the internal air exhaust space of the air exhaust duct is not occupied, the air exhaust duct space utilization ratio is improved greatly, and the flue gas discharge is more smooth.

Description

technical field [0001] The invention relates to an inlet flow guiding device of an exhaust passage, in particular to a pressure-changing flow guiding device for a fire-proof exhaust passage inlet. Background technique [0002] In the residential kitchen and bathroom centralized exhaust duct system, in order to make the oil fume enter the exhaust duct in the same direction as the flue gas flow, a guide pipe is installed at the entrance of the exhaust duct. According to the size of the exhaust duct, the guide pipe and the transformer plate occupy 10-50% of the cross-sectional area of ​​the exhaust duct, such as the invention patent 00128214. The "parallel variable pressure and exhaust gas exhaust structure" accounts for 20% of the cross section of the exhaust duct. These structures reduce the ventilation area of ​​the exhaust duct, indirectly increase the resistance and static pressure inside the exhaust duct, and make the range hood The air exhaust force is reduced. If the s...

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Problems solved by technology

[0003] The present invention aims at the part of the fire-proof exhaust extending into the exhaust duct in the prior art, which will occupy the area of ​​the exhaust duct when the residents on the floor do not exhaust smoke, and indirectly increase the resistance and static pressure inside the exhaust duct, making the The exhaust air force of the range hood is reduced, which affects the exhaust efficiency and other shortcomings. When the residents on the floor do not exhaust smoke, the back deflector of the deflector device is in a vertical state, parallel to the inner wall of the exhaust duct, and will not Occupies the area of ​​the exhaust duct; when exhausting, the back deflector forms a certain angle with the inner wall of the exhaust duct to form a diversion pipe structure, which can accelerate the upward guidance and discharge of the smoke.

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