SU943491A1 - Exhaust hood - Google Patents

Description

(54) EXTRACT UMBRELLA

one

The invention relates to ventilation and serves to remove gaseous hazards emitted during various technological processes.

An exhaust umbrella is known, comprising a conical body with an inlet and outlet, and an insert having the shape of a truncated body and facing downward with a smaller base downward in a housing with the formation of an annular gap.

The disadvantage of this umbrella is the uneven suction of air over the entire area of the inlet.

The purpose of the invention is to increase the suction equilibrium.

The goal is achieved by the fact that the insert is made perforated, and that the smaller base is located in the plane of the inlet of the housing.

The drawing shows an exhaust umbrella, a general view. ;

Exhaust umbrella contains a conical body 1 with an inlet 2 and an outlet nozzle 3 and placed in the body 1 with

the formation of an annular gap 4 insert 5, having the shape of a truncated cone and facing down the smaller base 6, and the insert 5 is made with perforation 7, and her; the smaller base 6 is located in the plane of the inlet 2 of the housing 1. The insert 5 has an inlet opening 8 and an outlet opening 9.

Umbrella works as follows.

ten

The polluted air entering the -casing 1 of the exhaust hood is divided into central, peripheral and jet streams. Peripheral air flow enters the annular gap 4, jet - passes through

Claims (1)

15, the perforation 7 of the insert 5, and the central perforation through the entrance of the opening 8 of the insert 5. Then the central and jet streams together pass through the output opening 9 and drain. 20 with a peripheral flow, are removed through the outlet nozzle 3. Due to the difference in resistance of the perforation 7 and the inlet opening 8, as well as the annular gap 4, the air flow is equalized, which ensures uniform suction over the entire area of the inlet 2 of the housing 1. This application the invention allows to reliably remove contaminated air over the entire area of the inlet, which is especially important when, for structural reasons, it is impossible to make an umbrella body of sufficient height, which reduces the capacity of the umbrella and the result is the discharge of polluted air from the periphery of the inlet. . Formula of Invention. Exhaust umbrella comprising a conical case with an inlet or outlet and placed in the case with the formation of an annular gap insert having a truncated cone shape and facing a smaller base down, characterized in that, in order to increase the uniformity of suction, the insert is perforated. } 1st, and its smaller base is located in the plane of the inlet of the housing. Sources of information taken into account in the examination 1. Patent of France N 2312306, cl. On 08 On 15/02, published 1977.