An adjustable pressure double-sided compression sealing device

Abstract

The invention discloses an adjustable pressure double-sided pressure sealing device in the technical field of grain and feed processing equipment. The sealing device comprises a rotating shaft and twosealing covers. Each sealing cover comprises an annular cover body and a flange ring. An elastic part fixed to the periphery of the rotating shaft is arranged between the two flange rings. The two sides of the elastic part are fixedly provided with dynamic sealing rings, and the peripheries of the flange rings are provided with static sealing rings. A sealing seat is arranged between the two annular cover bodies. Pressing assemblies for driving the static sealing rings to axially move are arranged on the static sealing rings and comprise inlets, wherein the inlets are formed in the sealing seat and used for introducing compressed air or hydraulic oil. A flowing channel communicating with the inlets is formed in the sealing seat. Annular grooves communicating with the flowing channel are formed in the annular cover bodies. Annular flanges are arranged on the static sealing rings. The outer diameters of the annular flanges are smaller than the outer diameters of the static sealing rings. An annular channel communicating with the annular grooves is formed between the peripheries of the annular flanges and the static sealing rings. The adjustable pressure double-sided pressure sealingdevice has the advantages of adjusting the pressing force and improving the sealing effect.

Description

technical field [0001] The invention relates to the technical field of grain and feed processing equipment, in particular to an adjustable pressure double-sided compression sealing device. Background technique [0002] In feed equipment, in order to prevent dust leakage at the shaft extension, a sealing device is usually installed at the exposed joint surface of the shaft extension and the housing, and the shaft or housing is generally rotated. The common structure is that the seal seat is fixed on the shell, there is a seal inside, and a compression piece is provided on the exposed surface. The compression piece is connected to the seal seat through a fastener, and the compression piece is axially compressed by the fastener. The force causes the radial deformation of the seal to wrap on the shaft to produce a sealing effect, and the seal that produces a sealing effect with the rotating shaft is easy to wear and cause the seal to fail. [0003] The prior art discloses a uti...

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Problems solved by technology

[0004] However, there are still the following problems: first, long-term use, the continuous friction between the first sealing ring and the first wear-resistant plate joint surface will cause wear and tear to form a gap, and the pressing force is small, resulting in seal failure. Second, the continuous friction between the contact surfaces of the wear-resistant plates produces wear and forms gaps, and the compression force decreases, resulting in seal failure; second, due to manufacturing reasons on both sides, the amount of compression deformation cannot be consistent, and the compression deformation of the joint surfaces on both sides after compression The tightening force will also be different; third, there is no way to judge the wear of the joint surface during use, and the maintenance personnel cannot perform effective maintenance to prolong the service life. They can only know the actual situation after the seal fails and leaks. Two sealing rings increase the cost of use

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