Feiliterフィルタは、自動車から製造業まで多くの業界で重要な役割を果たしています。フィルタを正しく選択することは、高価な機械を保護し、設備の円滑な稼働を確保し、最終製品の高品質を維持するのに役立ちます。誤ったフィルタを使用すると、システム全体に障害が発生することもあります。
では、フィルタが正しく機能しているかどうかをどうやって知っていますか。フィルタ性能について述べるときに考慮すべき2つの主要な要素は、捕捉効率と保持効率である。捕捉効率とは、フィルタが粒子を捕捉する効率を意味し、保持効率は、フィルタが粒子を保持する効率を測定する。フィルタが粒子を効果的に捕捉し保持できない場合、意図せずに流体系を汚染したり損傷したりする可能性があります。
フィルタテストでは、フィルタのパフォーマンスがどのようになっているか、アップグレードを検討するタイミングになっているかを知ることができます。2種類の試験は業界標準の多チャンネル試験ISO 16889と動的フィルタ効率(DFE)であり、動的フィルタ効率は多チャンネル試験であり、リアルタイムで油圧と潤滑油フィルタの捕捉と保持効率を定量化することを目的としている。
フィルタエレメントは、オペレーティングシステム内の不純物や汚染物質を除去し、汚染物質が機器の機能を妨げないようにすることを目的としている。タイプや用途は大きく異なる場合がありますが、カートリッジフィルタやスピンマウントフィルタなどの一般的な構成もあります。
フィルタは複数の材料で作られ、互いに結合することがあります。最も一般的な油圧ろ過媒体を見てみましょう。
セルロース
セルロースは広く存在する有機ポリマーであり、主に木材パルプと綿に由来し、生産コストは相対的に低い。しかし、均一な孔構造が欠如しており、これによりセルロースフィルタが変質したり脱落したりしやすくなる可能性がある。セルロースは粒子を捕捉することができるが、粒子を保持する上で効果が低く、脱落とともに産業システムの損傷を招く。
ガラス
構造操作を受けにくく、落ちにくいため、汚れがその場に残る。そのため、ガラスフィルタにはセルロースフィルタシステムのアップグレードとして絶対格付けが付与されている。
金網
金網濾過媒体はステンレス鋼で作られ、絶対定格を持っているが、セルロースよりも耐久性があり、粒子状物質を収容することができる。金網フィルタは耐火流体応用の理想的な選択であり、例えば高温調速器制御、製鉄所油圧及び航空機地上支持設備である。
Coalesce
Coalescing filters are designed to separate two fluids from one another in different phases, while also filtering out particulate. Common in a variety of industries, coalescing filters are available in two subtypes: liquid-liquid filters, and liquid-gas filters, Coalescing filters can bring together into large drops free and emulsified water dispersed in oil and fuels. Those large drops can then be easily removed from the oil or fuel stream. Synthetic coalescing media now replace treated paper media for superior reliability.
Resin
Resin filter media treats fluids at a molecular level by removing contaminant molecules such as acids and free radicals, that form as a byproduct of fluid degradation and oxidation. Resin filters are designed to remove specific contaminants from fluids without removing additives, which results in better fluid performance.
Non-spark Discharge
High flowing lubrication systems found in many gas turbines create a static charge that builds up on filter elements until the charge jumps to a ground source. These very high temperature events ( 1000 deg F + ) burn the oil creating varnish which collects in servo valves causing failure. Non-spark filter medias are grounded so they don't build up a static charge, which improves equipment reliability and extends fluid life.
These filters are designed to prevent spark discharge, and therefore prevent oil degradation and antioxidant additive depletion while extending fluid life.
Water Removal
Water removal filter media is designed to remove small amounts of water from hydraulic systems. Water removal filters are typically divided between two types, coalescing and absorption.
Acid and Varnish Removal
Designed to remove the contaminants that accumulate in all lubricants and lubricating fluids, and ensure smoother operating systems.
Upgrading your filters can improve your system, reduce damage to your machinery, and save money, while drastically improving your sustainability efforts. For more information on upgrading your filters, contact Feiliter today.
Filter elements are rated by particular micron sizes, which describes the smallest size of the particles they are able to remove. But filter elements with the same micron rating can have very different efficiencies, depending on the types of media they’re constructed from.
When choosing the proper filter solution, it’s important to understand how different types of media impacts a filter’s performance. Filters are rated by two types of efficiency ratings, nominal and absolute. Nominal ratings refer to a degree of filtration by the weight of solid particles. However, filters rated as nominal efficiency have no maximum pore size, meaning that they can still allow unwanted larger particles to pass through and potentially damage parts of the system. Media with absolute ratings have uniform pore size, and derive their value from the largest size particle that can pass through its pores.
Sourced mainly from wood pulp and cotton, cellulose is a widely used media type for industrial applications. Due to a lack of uniform pore size and effectiveness of organic cellulose fibers, cellulose filters are susceptible to degradation and structural manipulation with increasing fluid temperatures. They are therefore awarded nominal efficiency ratings, since they may allow unwanted particles to pass through and contaminate the system.
On the other hand, inorganic glass media fibers are more uniform in diameter, and smaller than cellulose fibers. That means they are able to capture and retain more particles than cellulose. As a result of their effectiveness and predictability, glass filter elements are given absolute efficiency ratings and are considered a high quality alternative to cellulose.
When upgrading your hydraulic oil filters from cellulose to glass media elements, the cleanliness of the system must be stabilized. During this phase, the life of a glass element may be temporarily shortened as it works to bring ISO cleanliness codes into a target range by removing accumulated fine particles that passed into the system via previous cellulose filters. However, once the system is clean, glass elements may last 4-5 times longer than the cellulose element it replaced.
For more information on how Feiliter can help you upgrade your filters from cellulose to glass, contact us today.
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