SU1590683A1 - Fan casing - Google Patents

Abstract

The invention makes it possible to reduce noise in case of an uneven arrangement in the circumferential direction behind the fan of obstacles due to the implementation of holes 6 in the radial partitions 5 dividing the internal cavity 3 into chambers, which connect the chambers to each other. At the same time, from the chamber of the casing in which the pressure zone is formed, due to the location of the obstacle (pulley) behind it, air flows through the holes 6 into the chambers behind which there are no obstacles, and then goes out through the perforations in the end wall. 2 Il.

Description

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The invention relates to a fan-casing, in particular to fan shields.

The purpose of the invention is to reduce the noise in an uneven arrangement in the circumferential direction behind the fan of obstacles.

Fig. 1 shows a fan casing, a longitudinal section; in fig. 2 is a section A-A in FIG. one.

The fan casing with an annular box-section has a perforated inner wall 1 and an end cage 2 on the outlet side. In the cavity p between the inner 1 and outer 4 rtenki, radial partitions 5 are installed, dividing it into chambers. iB radial partitions 5 are made; holes 6 connecting the chambers to each other. A drive pulley 7 is located behind the fan.

 When the fan is working, the air: the flow at the outlet of the casing meets-; the syringe with an obstacle — the pulley 7; as a result, in that part of the flow area; Odia A

The increase in pressure in this zone does not reach any appreciable magnitude, since air has the possibility of free flow from this zone through perforations in the inner wall 1 of the casing and then through the internal cavity 3 of the casing through openings 6 to the zone where there are no obstacles , with the subsequent exit to the outside

Claims (2)

through perforation in the end wall 2. Thus, any additional noise caused by the presence of an obstacle behind the fan does not occur. Invention Formula The fan casing with an annular box-section, the inner wall and end wall of which are perforated on the outlet side, and the cavity between the inner and outer walls is divided into chambers by radial partitions, in order to reduce noise with uneven location in the circumferential direction behind the obstacle ventilator, in the radial partitions holes are made connecting the chambers to each other.