Computer Aided Modeling and Deign of a New Magnetic Sealing Mechanism in Engineering Applications

Computer Aided Modeling and Deign of a New Magnetic Sealing Mechanism in Engineering Applications

Abstract

This article introduces a new type of magnetic sealing mechanism that reduces the lubrication oil pollution and media gaseous leakage in general reciprocating machinery including air compressors and refrigerators. The feasible function and reliable performance of this new sealing mechanism are introduced and analyzed in this paper. The computer aided design, modeling and analysis are being used to study this new sealing mechanism, and the prototype of this sealing mechanism is being tested. The study indicated the proper function of this sealing mechanism. The major advantages of this sealing mechanism include: improved sealing capacity to prevent the gaseous leakage and oil leakage, simple and compact in structure, lower pre-cision requirement on surfaces of reciprocating pistons and shafts in production and manufacturing, and longer services in sealing life span. Also there is almost no frictional loss during the reciprocating motion of piston or shaft.

Introduction

The gaseous leakage and oil pollution in reciprocating machines including compressors and refrigerators are common problems that have not been well resolved and it directly affects the machinery performance [1–4]. The design and development of new sealing mechanism are continued in these years [5–8].

In this research, a new magnetic sealing mechanism using rare-earth magnet as permanent magnet is devel-oped to solve these problems based on theoretic analysis, computational modeling simulation, and prototype tests. The permanent magnet is made from the materials that stay magnetized. Materials that can be magnetized are called ferromagnetic including rare earth magnets. The current research and development of rare earth perma-nent magnets have brought the renovation in the field of magnetic separation and provided the magnetic products that are an order of magnitude stronger than that of con-ventional ferrite magnets. This leads to the development of high-intensity magnetic circuits that operated energy free and surpasses the electromagnets in strength and effectiveness. Common applications of rare-earth mag-nets include: computer hard drives, audio speakers, bicy-cle dynamos, fishing reel brakes, mag-lev wind turbines, and LED throwies.

The prototype testing of this new magnetic sealing mechanism indicated that this sealing mechanism can significantly reduce the leakage problem in reciprocating machines including compressors and oil pollution in cryogenic regenerator. It also shows that this sealing mechanism can replace the oil separation system in re-frigerating compressors. Through the prototype tests, the sealing function of this new mechanism is better than regular rubber seal, diaphragm seal, corrugated pipe seal and magnetic fluid seal.

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