Differential pressure type exhaust fan drainer

Abstract

The invention relates to a drainer for kitchens, factory buildings, hotels, and the like, in particular to a differential pressure type exhaust fan drainer comprising a pipe body and a cover. The pipe body is internally provided with a vent flue, the cover is conical and shields one end of the vent flue, and the round surface of the pipe body is provided with an air outlet communicated with the vent flue. The invention has the advantages that the air outlet faces downwards so that air hardly enters the pipe from the lower side, the top cover prevents rain from entering from the air outlet, and a filter screen effectively blocks mosquitoes from entering from an air inlet which is in a structure causing air superposition so as to benefit air discharge. The exhaust fan drainer of the differential pressure type can resist down draft, rain and mosquitoes and has high air discharge rate.

Description

technical field [0001] The invention relates to an outlet device for exhausting air in kitchens, workshops, hotels, etc., in particular to a differential pressure exhaust fan outlet device. Background technique [0002] The most popular exhaust fan outlets on the market are divided into two categories. The first type is a vertical exhaust fan outlet; the other is a parallel elbow type and a straight open type outlet. [0003] The first type: vertical exhaust fan outlet, the main structure is: the common shape of the top cover is a conical top cover or a round top cover, the top cover is connected to the air outlet of the air outlet pipe through a support rod, the working principle: wind The way of blowing air from all sides of the air outlet sends the wind outside. The main function of the top cover is to prevent rainwater, but there is a backwind phenomenon, which makes the air outlet efficiency low, and mosquitoes are easy to enter the air outlet pipe from the air outlet. ...

AI Technical Summary

Problems solved by technology

[0003] The first type: vertical exhaust fan outlet, the main structure is: the common shape of the top cover is a conical top cover or a round top cover, the top cover is connected to the air outlet of the air outlet pipe through a support rod, the working principle: wind The way of blowing air from all sides of the air outlet is to send the wind outside. The main function of the top cover is to prevent rainwater, but there is a backwind phenomenon, which makes the air outlet efficiency low, and mosquitoes are easy to enter the air outlet pipe from the air outlet.

[0004] The second type: parallel elbow type and straight open type outlet device, it is often used in home kitchen ventilation, its working principle is to perforate through the wall, connected by the parallel round pipe of the air duct and the outlet of the elbow pipe, and the parallel elbow The type air outlet also only plays the role of preventing rainwater, and cannot make good use of the principle of wind pressure. It simply uses the exhaust power of the range hood to discharge the oil fume to the outside. However, when there is strong outdoor wind, the oil fume from the air outlet It is easy to be blocked by strong wind and forced back into the tube, resulting in low air outlet efficiency, and mosquitoes are easy to enter from the air outlet and the air outlet rate is high

[0005] The defects of the above two categories of products are that they cannot be anti-wind, anti-rain, anti-mosquito and high wind rate at the same time.

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