High-temperature resistant centrifugal fan

Abstract

The invention discloses a high-temperature resistant centrifugal fan, comprising a fan body, a driving group, a rotary joint and a cooling medium collector, wherein the fan body comprises an enclosure, a wind inlet, an impeller, a hub, a wheel disc and a wind outlet; the driving group comprises a main shaft and a belt wheel; the rotary joint is provided with a cooling medium inlet and a rotary joint seal; the main shaft is in a hollow structure, one end of the main shaft is connected with the hub of the impeller, and the other end of the main shaft is connected with the rotary joint; a core pipe is arranged inside the main shaft; an annular cavity is formed between the main shaft and the core pipe; the hub is in a hollow structure, and a hollow cavity is formed in the hub; the joint between the main shaft and the hub is provided with a cooling medium path; and the cooling medium enters the core pipe from a cooling medium inlet positioned on the rotary joint and is introduced into the hub via the cooling medium path to be cooled. According to the high-temperature resistant centrifugal fan disclosed by the invention, the fan can bear 1000-DEG C high-temperature gas delivery due to the hollow structures of the main shaft and the hub and the cooling of the cooling medium.

Description

Technical field: [0001] The invention relates to a ventilation device, in particular to a high-efficiency centrifugal fan capable of transporting high-temperature gas. Background technique: [0002] Centrifugal fans are widely used in metallurgy, building materials, heat treatment, food and other fields due to their simple structure, low manufacturing cost, large flow rate of gas and high pressure. Independent support from the main shaft, coupled with structural features such as large width of the impeller, when the fan requires large flow and high pressure and the impeller rotates at a high speed, it is easy to cause the blade to bend and damage the machine; at the same time, when conveying high-temperature gas, due to the hub The unequal thickness of the disc and the coefficient of thermal expansion of the rivet or bolt can easily lead to loosening of the rivet or bolt, and the heat transfer of the high-temperature gas can also cause damage to the bearing. Therefore, gene...

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned existing technologies mostly adopt air cooling and forced cooling to cool the main shaft and bearings, but the hub of the impeller cannot be cooled, and the rivets of the hub and disc of the impeller cannot be eliminated due to the thermal expansion of the rivets, which causes the gap to change and cause the rivets to loosen. It will not be able to cool and protect the fan impeller

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