Magnetically controlled shape memory effect-based rubber sealing structure with adjustable holding force

Abstract

The invention discloses a magnetically controlled shape memory effect-based rubber sealing structure with adjustable holding force. The rubber sealing structure comprises a rubber sealing ring and a holding force adjusting device, wherein the rubber sealing ring comprises a rubber base body, a metal framework, a sealing lip and a dustproof lip; the holding force adjusting device comprises a spiral adjuster, a wedge-shaped sliding block, a magnetically controlled shape memory alloy block, a magnet exciting coil, an alloy block mounting base, a gland, a first screw and a second screw; the holding force adjusting device adjusts and controls the sealing holding force by pushing the wedge-shaped sliding block to move and extruding the rubber base body to deform; the spiral adjuster pushes the wedge-shaped sliding motion by moving the magnetically controlled shape memory alloy block, and power-off protection is achieved for adjustment of the sealing holding force; and the magnetically controlled shape memory alloy block deforms under the action of a magnetic field to push the wedge-shaped sliding motion, and the magnitude of the magnetic field can be adjusted by adjusting the voltage or current of an external power supply. According to the rubber sealing structure, real-time regulation and control of the holding force of a rubber sealing element can be realized, the sealing reliability can be effectively improved, and the sealing service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of rubber molding sealing structure design, in particular to a rubber sealing structure with adjustable holding force based on the magnetically controlled shape memory effect, which can be used as a rotating or reciprocating dynamic seal, and can also be used as a static seal. Background technique [0002] The rubber molding seal is a typical self-tightening seal, relying on the elastic deformation of the rubber sealing lip and the shaft interference fit, so that the contact pressure of the sealing interface is greater than the pressure of the sealed medium, thereby blocking the leakage channel to achieve the sealing function, and is called Widely used in rotating or reciprocating mechanical equipment in the fields of aerospace, marine vehicles, petrochemical and construction machinery. [0003] During the long-term service process, the sealing lip will inevitably wear and tear, resulting in a decrease in th...

AI Technical Summary

Problems solved by technology

[0003] During the long-term service process, the sealing lip will inevitably wear and tear, resulting in a decrease in the interference between the seal and the shaft, resulting in a decrease in the sealing force, which will cause medium leakage, economic losses and even safety accidents

However, because the traditional rubber molded seals do not have the function of self-compensation of the clamping force, once the wear and tear will induce seal failure, the sealing reliability is not high; In harsh service environments such as solids, strong vibrations, and wide temperature changes, seals are more prone to wear and have higher requirements for sealing reliability. This requires seals that can compensate for lip wear in a timely manner, or can artificially adjust the holding force To achieve optimal sealing operation, thereby improving the sealing performance and operational reliability of the seal under high-parameter working conditions and harsh service environments, and prolonging the service life of the seal

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