Axial combined sealing mechanism

Abstract

The invention discloses an axial combined sealing mechanism, which is composed of a main shaft and a labyrinth sealing part, a release chamber, a packing shaft sealing part and a bearing seat which are successively set on the main shaft; and the periphery of the packing shaft seal components. There is also a vacuum device connected to the release bin, and the vacuum therein is slightly smaller than that in the kneader. The shaft sealing effect of the invention is good, the frictional resistance is small, the powder in the release bin will not flow back into the kneader, and at the same time, the dust or fluid in the kneader is prevented from overflowing into the release bin.

Description

technical field [0001] The invention relates to a shaft seal technology in the fluid machinery industry. Background technique [0002] The vacuum kneader is a common chemical machinery product. When its reamer is rotating, the traditional method of the journal is to seal the shaft by weaving soft packing (commonly known as: packing), so that the shaft rotates. At this time, the air outside the pot does not enter the inside of the pot, and the inside of the pot reaches the required vacuum degree under the action of the vacuum pump. However, due to the long-term rotation of the reamer shaft, the packing will inevitably wear continuously, which will gradually reduce the sealing effect, cause air leakage and material leakage in the pot body, reduce production efficiency, increase raw material loss, and the more troublesome is the worn packing. Under the action of negative pressure (suction) in the pot, the powder is continuously sucked into the materials in the pot (for example...

AI Technical Summary

Problems solved by technology

However, due to the long-term rotation of the reamer shaft, the packing will inevitably wear continuously, which will gradually reduce the sealing effect, cause air leakage and material leakage in the pot body, reduce production efficiency, increase raw material consumption, and the more troublesome is the worn packing. Under the action of negative pressure (suction) in the pot, the powder is continuously sucked into the materials in the pot (for example, food is stirred in the pot), which directly affects the product quality. This problem has plagued many enterprises for a long time. Regulating the pressure packing and replacing the packing can alleviate the vacuum degree drop and material leakage to a certain extent, but for many years this is the sealing structure of the braided packing (packing root), which makes everyone feel that there are many defects in the food industry

[0003] The invention with the patent application number 2018109205664 provides a flexible sealing device for the stirring paddle shaft of a vacuum kneader. The parts of the flexible sealing device include: fixed flange, corrugated flexible pipe, transition flange, sealing cavity, sealing ring, double O Type rings, bushings, bearings, springs and fixed rings; among them, the bushing covers the bearing, the bearing covers the sealing cavity, and the sealing cavity is equipped with a spring, which drives the bushing to squeeze the sealing ring, and the sealing ring is installed in the transition flange. And it is connected and fixed with the sealing chamber as a whole. The transition flange is connected with the fixed flange through the corrugated flexible pipe, and the fixed flange is fixed on the side plate of the kneader. Large, high maintenance cost

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