Chimney hood capable of preventing smoke backward flowing and promoting indoor outdoor air exchange

Abstract

The invention discloses a chimney hood capable of preventing smoke backward flowing and promoting indoor outdoor air exchange. The chimney hood comprises an upper hood body, a top cover, a lower hoodbody, supporting rods I and a clamping part, wherein the upper hood body is in the shape of a cone of which an opening is upward; the top cover covers the opening of the upper hood body; the lower hood body is right positioned below the upper hood body; the upper part of the lower hood body is in the shape of a cone of which an opening is upward; an interval is reserved between the lower hood bodyand the upper hood body; the lower part of the lower hood body is tubular; the upper part and the lower part are integrally welded; the supporting rods I are positioned between the upper hood body and the lower hood body; the two ends of the supporting rods I are fixedly connected with the upper hood body and the lower hood body separately; and the clamping part sleeves the lower part of the lower hood body. According to the chimney hood, gases in a chimney can be smoothly exhausted in a strong wind condition, and air does not backward flow; and besides, when no flue gas exists in the chimney, the gases in the chimney are exhausted under the action of negative pressure, indoor air pressure is smaller than external air pressure, the effect that indoor air and external air exchange is achieved, and indoor air maintains fresh.

Description

technical field [0001] The invention belongs to the field of fluid dynamics, and in particular relates to a chimney cover which prevents flue gas from flowing backward and can promote indoor and outdoor air exchange. Background technique [0002] In order to facilitate the continuous use of fuel in the fuel furnace in winter in northern my country, there is a habit of keeping the furnace without an open flame and maintaining a certain temperature. The winter in northern my country is cold and the wind is strong, and under the condition of colder and strong air flow, the cold air will flow into the furnace cavity from top to bottom through the chimney under the action of strong pressure, and the carbon body in the furnace will be in a certain relationship. Under the action of temperature, the reaction produces carbon monoxide. Since there is no open flame, the toxic gas is easily discharged into the room through the furnace shell, causing casualties. [0003] At the same time...

AI Technical Summary

Problems solved by technology

The winter in northern my country is cold and the wind is strong, and under the condition of colder and strong air flow, the cold air will flow into the furnace cavity from top to bottom through the chimney under the action of strong pressure, and the carbon body in the furnace will be in a certain relationship. Under the effect of temperature, the reaction produces carbon monoxide. Since there is no open flame, the toxic gas is easily discharged into the room through the furnace shell, causing casualties

[0003] At the same time, the public chimney pipe attached to the inside of the building will also carry out air backflow in the weather with strong air flow, causing oily smoke to flow into the room, forming indoor air pollution, and people will feel uncomfortable

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