在工業(yè)氣體輸送領(lǐng)域，羅茨鼓風(fēng)機(jī)憑借穩(wěn)定的容積式送風(fēng)特性，成為污水處理、氣力輸送、水產(chǎn)養(yǎng)殖等場(chǎng)景的 “得力干將”。而作為其核心部件的葉輪，材質(zhì)選擇直接關(guān)乎設(shè)備的效率、壽命與可靠性。面對(duì)不同的工況挑戰(zhàn)，如何為葉輪挑選合適的 “鎧甲”？這背后藏著從性能需求到環(huán)境適配的多維度考量。

　　In the field of industrial gas transportation, Roots blowers have become a powerful force in sewage treatment, pneumatic conveying, aquaculture and other scenarios due to their stable volumetric air supply characteristics. As the core component of the impeller, the material selection directly affects the efficiency, lifespan, and reliability of the equipment. How to choose the appropriate "armor" for the impeller in the face of different working conditions challenges? Behind this lies a multidimensional consideration from performance requirements to environmental adaptation.

　　羅茨鼓風(fēng)機(jī)的葉輪在高速旋轉(zhuǎn)中承擔(dān)著推送氣體的重任，其材質(zhì)需滿足 “強(qiáng)抗壓、耐磨損、抗腐蝕、耐高溫” 等多重要求，而這些特性的優(yōu)先級(jí)由實(shí)際工況決定。

　　The impeller of the Roots blower bears the responsibility of pushing gas during high-speed rotation, and its material needs to meet multiple requirements such as "strong compression resistance, wear resistance, corrosion resistance, and high temperature resistance", and the priority of these characteristics is determined by the actual working conditions.

　　1. 介質(zhì)特性：對(duì)抗 “無形殺手” 的第一道防線

　　1. Media characteristics: the first line of defense against "invisible killers"

　　清潔氣體輸送：若輸送空氣、氮?dú)獾葷崈艚橘|(zhì)，葉輪材質(zhì)可優(yōu)先考慮性價(jià)比?；诣T鐵（如 HT250）是常見選擇，其鑄造性能優(yōu)異、成本低廉，且具有一定的耐磨性與剛性，能滿足大多數(shù)常規(guī)工況。例如在水產(chǎn)養(yǎng)殖增氧場(chǎng)景中，葉輪長(zhǎng)期接觸潮濕空氣，鑄鐵表面經(jīng)防銹處理（如噴涂環(huán)氧樹脂）后，可有效抵御水汽侵蝕，使用壽命可達(dá) 5-8 年。

　　Clean gas transportation: If transporting clean media such as air and nitrogen, the impeller material can be prioritized for cost-effectiveness. Gray cast iron (such as HT250) is a common choice due to its excellent casting performance, low cost, and certain wear resistance and rigidity, which can meet most conventional working conditions. For example, in the aerobic scenario of aquaculture, the impeller is exposed to humid air for a long time. After rust prevention treatment (such as spraying epoxy resin) on the cast iron surface, it can effectively resist water vapor erosion and have a service life of 5-8 years.

　　含粉塵 / 顆粒氣體：當(dāng)介質(zhì)中含有粉塵（如水泥輸送、谷物加工），葉輪面臨強(qiáng)烈的沖刷磨損，需強(qiáng)化耐磨性。球墨鑄鐵（如 QT400-18）或合金鑄鐵（添加鉻、鉬等元素）成為優(yōu)選，其基體組織更細(xì)密，硬度可達(dá) HB200-250，抗顆粒沖擊能力比普通鑄鐵提升 30% 以上。部分工況還會(huì)采用表面硬化處理，如滲氮、堆焊耐磨焊條，在葉輪邊緣等易損部位形成保護(hù)層，減緩磨損速率。

　　Containing dust/particulate gas: When the medium contains dust (such as cement transportation, grain processing), the impeller faces strong erosion and wear, and the wear resistance needs to be strengthened. Ductile iron (such as QT400-18) or alloy cast iron (with added elements such as chromium and molybdenum) are preferred, as their matrix structure is finer and their hardness can reach HB200-250. Their resistance to particle impact is increased by more than 30% compared to ordinary cast iron. Some working conditions may also use surface hardening treatment, such as nitriding and welding wear-resistant electrodes, to form a protective layer on vulnerable parts such as the impeller edge, slowing down the wear rate.

　　腐蝕性氣體：輸送硫酸、鹽酸、硫化氫等腐蝕性介質(zhì)時(shí)，材質(zhì)需具備抗化學(xué)侵蝕能力。鋁合金（如 ADC6）憑借表面自然形成的氧化鋁薄膜，在中性或弱酸性環(huán)境中表現(xiàn)優(yōu)異，且質(zhì)量輕（密度僅為鑄鐵的 1/3），可降低葉輪轉(zhuǎn)動(dòng)慣量，提升風(fēng)機(jī)效率。但在強(qiáng)酸性或含氯離子環(huán)境中，需選用不銹鋼材質(zhì)（如 304、316L），其中 316L 因添加鉬元素，抗點(diǎn)蝕能力顯著增強(qiáng)，適用于化工、制藥等嚴(yán)苛場(chǎng)景。

　　Corrosive gases: When transporting corrosive media such as sulfuric acid, hydrochloric acid, hydrogen sulfide, etc., the material must have chemical resistance. Aluminum alloys (such as ADC6) exhibit excellent performance in neutral or weakly acidic environments due to the naturally formed aluminum oxide film on their surface. They are also lightweight (with a density only one-third of cast iron), which can reduce the rotational inertia of the impeller and improve the efficiency of the fan. However, in strongly acidic or chloride containing environments, stainless steel materials (such as 304, 316L) need to be selected. Among them, 316L has significantly enhanced pitting corrosion resistance due to the addition of molybdenum element, making it suitable for harsh scenarios such as chemical and pharmaceutical industries.

　　2. 工況參數(shù)：應(yīng)對(duì) “極端環(huán)境” 的硬性指標(biāo)

　　2. Operating parameters: Hard indicators for dealing with "extreme environments"

　　溫度挑戰(zhàn)：普通鑄鐵葉輪適用溫度一般不超過 200℃，超過此范圍需改用耐熱材料。高溫工況（如窯爐煙氣輸送）中，球墨鑄鐵經(jīng)退火處理可耐受 300℃短期高溫，而鎳鉻合金鑄鐵（如 Ni-Hard）或鑄鋼（如 ZG230-450）能在 400-500℃環(huán)境中長(zhǎng)期穩(wěn)定運(yùn)行，其金相組織中的碳化物分布均勻，避免了高溫下的晶粒粗大與強(qiáng)度衰減。

　　Temperature challenge: Ordinary cast iron impellers are generally suitable for temperatures not exceeding 200 ℃, and heat-resistant materials need to be used if this range is exceeded. In high-temperature conditions (such as furnace flue gas transportation), ductile iron can withstand short-term high temperatures of 300 ℃ after annealing treatment, while nickel chromium alloy cast iron (such as Ni Hard) or cast steel (such as ZG230-450) can operate stably in an environment of 400-500 ℃ for a long time. The carbide distribution in its metallographic structure is uniform, avoiding grain coarsening and strength degradation at high temperatures.

　　壓力與轉(zhuǎn)速：高壓型羅茨鼓風(fēng)機(jī)（如升壓超過 50kPa）對(duì)葉輪強(qiáng)度要求更高。鑄鋼葉輪（如 ZG310-570）的抗拉強(qiáng)度可達(dá) 570MPa，是灰鑄鐵的 2 倍以上，能承受高速旋轉(zhuǎn)時(shí)的離心力與氣體反作用力，減少變形風(fēng)險(xiǎn)。在高轉(zhuǎn)速場(chǎng)景（如 2000rpm 以上），輕質(zhì)材料如鋁合金或碳纖維增強(qiáng)復(fù)合材料更具優(yōu)勢(shì)，可降低葉輪不平衡量，減少振動(dòng)與噪聲。

　　Pressure and speed: High pressure Roots blowers (such as those with a pressure increase exceeding 50kPa) require higher impeller strength. The tensile strength of cast steel impellers (such as ZG310-570) can reach 570MPa, which is more than twice that of gray cast iron. They can withstand the centrifugal force and gas reaction force during high-speed rotation, reducing the risk of deformation. In high-speed scenarios (such as above 2000rpm), lightweight materials such as aluminum alloy or carbon fiber reinforced composite materials have more advantages, which can reduce the unbalance of the impeller, reduce vibration and noise.

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