最適なソリューションを共有する, HVACR の専門知識と業界ニュース

冷凍機油の正しい選び方?

目次

Refrigeration oil is a lubricating oil specially used for refrigeration compressor, working temperature is -40 ~ +120℃.

分類

One is traditional mineral oil; The other is synthetic polyol ester oil such as POE (polyol ester), PAG (polyalkylene glycol) 等, which often called polyester oil.

Common Refrigeration Oil List

1. Mineral Oil

Examples: Suniso 3GS, 4GS, 5GS

応用: Typically used in older refrigeration systems which use CFC (chlorofluorocarbon) or HCFC (hydrochlorofluorocarbon) 冷媒, like R12 or R22.

特徴: Good lubrication properties but not suitable for modern HFC (hydrofluorocarbon) 冷媒.

2. Polyolester (POE) 油

Examples: Mobil EAL Arctic, Emkarate RL 32, RL 68, RL 170

応用: Widely used in modern systems with HFC refrigerants like R134a, R404a, and R507. Also suitable for systems using newer, environmentally-friendly refrigerants.

特徴: Excellent compatibility with HFC refrigerants and provide good thermal and oxidative stability.

R404 cold room refrigeration oil

3. Polyalkylene Glycol (PAG) 油

Examples: Icematic SW68, Emkarate RL 32H

応用: Used primarily in automotive 空調 and certain refrigeration systems. Works well with refrigerants like R134a.

特徴: Provide good lubrication but is hygroscopic (absorbs moisture), require careful handling.

4. Alkylbenzene (AB) 油

Examples: Zerol 150, Zerol 300

応用: Often used in refrigeration systems with HCFC refrigerants like R22. It can also be used as a blend with mineral oils.

特徴: Offers good thermal stability and can help in systems that need both mineral and synthetic oil compatibility.

5. Polyalphaolefin (PAO) 油

Examples: Mobil SHC Gargoyle 68, Suniso SL-32

応用: Used in industrial refrigeration systems, especially in low-temperature applications with ammonia (R717).

特徴: Excellent low-temperature performance and resistance to oxidation.

特徴

1. Reduce friction and wear.
2. Fill the sealing part with oil to ensure sealing performance and prevent refrigerant leakage.
3. The movement of oil removes the wear debris generated by metal friction and can clean the friction surface.
4. Provide hydraulic power for the unloading mechanism.

Performance Requirement

1. Appropriate viscosity

In addition to ensure good lubrication of the componentsfriction surfaces, viscosity of the refrigeration oil should also take away some heat from the refrigeratant and play a sealing role. If the refrigerant used in the compressor is highly miscible with the refrigeration oil, you should use an oil with a higher viscosity to prevent the lubricating oil being diluted by the refrigerant.

2. Low volatility and high flash point

The greater the volatility of refrigeration oil, the more oil circulates with the refrigerant. したがって, the distillation range of the refrigeration oil should be as narrow as possible, and the flash point should be 25~30°C higher than exhaust temperature of the compressor.

refrigerant oil

3. Good chemical and thermal oxidation stability

The highest compression temperature of the compressor can reach 130~160℃. At this temperature, refrigeration oil will be heated then decomposed and deteriorated continuously, forming carbon deposits and causing compressor malfunction and wear.

4. Free of water and impurity

Because water freezing in the evaporator will affect the heating efficiency, and water contacted with refrigerant will accelerate decomposition of the refrigerant and corrode the equipment, so refrigeration oil can’t contain water and impurities.

5. その他

Refrigeration oil should also have good anti-foaming properties, and shouldn’t dissolve or expand rubber, enameled wire and other materials. It should have good electrical insulation when used in closed 冷凍装置.

Refrigeration Oil Deterioration Reason

1. Mixed in Moisture

As air seeps into the refrigeration system, so the moisture in the air will mix with the refrigeration oil after contact; whenever the refrigerant contains water, then moisture will also mix into the refrigeration oil.

Moisture mixed into the refrigeration oil will decrease oil viscosity and cause metal corrosion.

2. Oxidation

When the compressor exhaust temperature is high during refrigeration oil use, possibly cause oxidation and deterioration. Especially refrigeration oil with poor chemical stability, which is more prone to deterioration. After a period of time, refrigeration oil will contain residue, then will deteriorate the lubrication of bearings and other parts.

3. Mixing of refrigeration Oil

When several different refrigeration oils are mixed, will decrease refrigeration oil viscosity, even destroy the oil film, causing bearingsdamage.

4. Contain Impurity

Contains mechanical impurities, which will increase the friction surface wear of the components and quickly clog filter and throttle valve or expansion valve.

冷凍機油 01

Select Correct Refrigeration Oil Principle

1. Based on Compression Type

がある 3 types of compressors used in 冷凍装置: piston type, screw type and centrifugal type. The refrigeration oil of piston and screw types are in direct contact with the compressed refrigerant, so must consider the mutual influence between refrigeration oil and the refrigerant.

The refrigeration oil used in the centrifugal type is only used to lubricate the rotor bearings, so can be selected according to the load and speed.

2. Based on Refrigerant Type

Must consider the mutual influence between refrigerant and refrigeration oil because they will directly contact. Refrigerant such as Freon can be dissolved in mineral oil, so should select refrigeration oil have higher viscosity grade to prevent the refrigeration oil from being diluted then unable to perform properly.

加えて, should pay more attention to whether some refrigeration oil mixed in the refrigerant, which will affect refrigeration system working properly.

3. Based on Refrigerant Evaporation Temperature

一般的に言えば, for compressor with low refrigerant evaporation temperature, should choose refrigeration oil with low freezing point to prevent the refrigeration oil (carried into the refrigeration system by the refrigerant) from condensing on the throttle valve and evaporator, thereby affecting the refrigeration efficiency.

For compressor using ammonia as refrigerant, freezing point of the refrigeration oil should be lower than the evaporation temperature.

For compressor using Freon as refrigerant, freezing point of the refrigeration oil should be higher than the evaporation temperature.

結論

一言で, select the correct refrigeration oil is crucial to ensure the efficiency and durability of refrigeration systems.

By understanding the types of oils available, their performance requirements, reasons for deterioration, and selection principles, you can make informed choices that enhance system reliability and minimize maintenance issues.

コメント?

ようこそメッセージを残すか、再投稿してください.

フェイスブック
ツイッター
リンクトイン
レディット
印刷する

返信を残す

当社について

チャイナ・スピードウェイ・グループ プロフェッショナルな HVACR 製品です’ メーカーと卸売業者, さまざまな HVACR 製品およびスペアパーツをカスタマイズします, 特に冷凍製品と部品. エアコンなど, 冷凍装置, 冷蔵室ソリューション, 氷製造機, 除湿機, 電気モーター, 熱交換器,銅コイル, 等.

以来、HVACR分野で働いてきました 2010, 私たちはより多くの経験を持っており、独自の製品とソリューションを提供できます, また、技術サポートの生涯無料料金を提供します. あなたのサンプルでお問い合わせを歓迎します, 描画またはデザイン, 私たちの目的は、あなたのアイデアを実現し、あなたに利益をもたらすことです.

そのうえ, 私たちのクライアントのために, 他の製品を調達します, サプライヤーを確認する, あなたのための無料料金で彼らと交渉する.

著者について

の写真 ビック・チャン
ビック・チャン

やあ, 私はヴィックです! 以来、HVACR分野での作業を開始 2008, 当社の主力製品が含まれます: 空調, 冷蔵室冷凍システム, ウォーターチラー, 氷製造機, 業務用脱水機, 除湿機, ヒートポンプ, 電気モーター, とすべての付属品. 中国スピードウェイグループに参加して以来 2012, 私はここで以上の仕事をしました 10 年, 輸出部門の部長として, 私たちは確立しました 50+ さまざまな国や地域の代理店.
私たちの経験と強力な技術サポートとして, 問題が発生したら、問題を解決できます, 当社のチーフエンジニアは以来、HVACR分野で働いています。 1997. エンジニアだけでなく、私たちの知識がますます人気になっていることを誇りに思います, HVACR ビジネスの新規参入者向け, DIY愛好家. 私たちの記事を楽しんでいただければ幸いです, 質問やコメントがあれば、cn-beyond.com でマーケティングを送ってください。

すべての投稿

お問い合わせ

メールアドレスを入力するだけです, 電話番号とこのフォームでのお問い合わせの簡単な説明. 以内にご連絡させていただきます 24 時間.

お問い合わせ

私たちと一緒にプロジェクトを始める準備ができました?

私たちと提携してブランドの評判を高めてください, クライアントにあなたのことを一生覚えてもらえるような印象的な体験を提供します, 競争市場で目立つように支援します !

最高の OEM パートナーをお見逃しなく!

私たちと一緒に働く準備ができています?

私たちの違いを体験し、あなたのビジネスのより良い未来に向けた第一歩を踏み出しましょう!