Centrifugal air pump with knife edge sealing structure

Abstract

The invention relates to the field of centrifugal air pumps. An existing centrifugal air pump mainly uses a comb tooth labyrinth to seal, relies on tooth slot gaps to dam gas and reduce the pressure of the gas, and therefore achieves the purposes of reducing leakage and sealing; however, tooth slots are usually made of steel materials, so that limited by the process, it is impossible to achieve the absolute agreement between the actual size of each tooth slot gap and the required size, and thus the accuracy of the tooth slot gaps is reduced so as to affect the sealing effect. Aiming at the problem, the invention provides a centrifugal air pump with a knife edge sealing structure. The sealing structure includes a ring-shaped sealing seat which is arranged on the inner wall of a rear casing,and a sealing cushion which is arranged on a main shaft and matched with the sealing seat in a sealing mode; the sealing seat is of a double-layer composite structure and includes an aluminium platelayer and a steel plate layer, wherein the side, toward the sealing cushion, of the sealing seat is the aluminium plate layer, and the side, toward a pressing plate, of the sealing seat is the steel plate layer; the sealing cushion is made of a steel plate. The centrifugal air pump uses the double-layer composite structure of the sealing seat, each tooth slot gap is controlled accurately, and thebetter sealing effect of the air pump is achieved.

Description

technical field [0001] The invention relates to the field of centrifugal air pumps, in particular to a centrifugal air pump with a knife-edge sealing structure. Background technique [0002] The labyrinth seal is to set a number of ring-shaped sealing teeth arranged in sequence around the rotating shaft. A series of interception gaps and expansion cavities are formed between the teeth. Purpose. Because there is a gap between the rotor and the casing of the labyrinth seal, there is no solid contact, no lubrication, and thermal expansion is allowed, and it is suitable for high temperature, high pressure, and high speed frequency occasions, so it is widely used in the seal of the shaft end and the stage of the air pump. [0003] At present, the centrifugal air pump mainly adopts the comb-tooth labyrinth seal, which relies on the alveolar gap to intercept and decompress the gas, thereby reducing leakage and achieving the purpose of sealing. Since it is a non-contact seal, in or...

AI Technical Summary

Problems solved by technology

However, since the tooth grooves are usually made of steel materials, due to the limitation of the process (such as low dimensional accuracy of the tooth tip), it is impossible to ensure that the actual size of each tooth groove gap is absolutely consistent with the required size, which reduces the precision of the tooth groove gap, thus affecting the seal. Effect

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