185 风扇与换气扇件
风扇件的工况是长期旋转
风扇和换气扇一年运行上千小时，转叶长期承受离心力 + 振动。
这个工况的核心失效机理是蠕变和疲劳，不是一次强度。风叶蠕变后会变形、动平衡破坏、噪音上升、风量下降。选料的起点是长期蠕变数据。
风叶的材料选择
落地扇和台扇风叶：直径 300-400 mm，转速 1000-1400 rpm，走 PP-GF20 或 AS（苯乙烯丙烯腈）。PP-GF 便宜、韧性好、蠕变可接受。换气扇和排气扇风叶：走 PA66-GF30 或 ABS，要耐温（浴室 60-70℃）+ 阻燃。工业风扇风叶：走 PA66-GF30 或玻纤增强 PP，要强度和耐候。
现场还原：风扇叶的静音账
2025 年 6 月，东莞一家风扇厂的消音室里，工程师给我们做了一组对比：两台风扇同转速运转，一台明显有「沙沙」的叶尖噪声，一台安静得多。
差别在叶轮：噪声那台用的是普通 PP 叶轮，运转受热加离心力，叶尖微变形，动平衡漂移——漂移量不到 1 克，人耳听得出。安静那台是玻纤增强 PP 改性牌，刚性高一档，叶形保持得好。
风扇这个品类，价格战打到极致，材料账往往压到几毛钱一档，但静音这一档的溢价是真实存在的：同配置风扇，静音款零售价高 15-20%，评价区的关键词全是「安静」。
叶轮选材的账就变成这样：改性牌比通用牌贵一块五，换来叶形十年不漂、动平衡稳定、噪声曲线平滑——这笔账在零售端能收回来两倍。
风扇是「长期旋转件」的教科书品类：所有关于蠕变、疲劳、动平衡、噪音的材料学，在一片叶子上全部用得上。讲给新采购听，就从这片叶子讲起。
蠕变是设计关键
风叶在离心力下长期旋转，叶尖的蠕变会让叶片伸长变形。
PA66-GF30 在 20 MPa、60℃ 下 1 万小时蠕变约 1%，PP-GF20 在同样条件达 3%。
这就是工业风扇不用 PP 的原因。设计时要按蠕变后的尺寸校核叶尖间隙，间隙太小会扫膛。
噪音的三个来源
风扇噪音来自气动噪音、电机噪音、结构共振。塑料件能影响的是后两者：风叶动平衡（材料密度均匀性）、支撑刚度（玻纤含量）、连接阻尼（用 TPE 垫减振）。
风叶的材料密度均匀性至关重要——玻纤分布不均直接导致动平衡差。
深一层：蠕变——风扇件的隐形杀手
聊风扇和换气扇，把蠕变这个概念在这类产品上的具体表现讲透，因为它是旋转件选材的分水岭。
风扇叶轮旋转时，每一片叶受离心力，叶根应力最大。普通塑料在常温下持续离心应力里，会缓慢拉伸变形——叶片越来越「摊开」，叶形角漂移，风量下降是轻的，动平衡破坏带来的振动和噪音才是主线。
夏天连续运转的扇叶、工业换气扇 24 小时转的叶轮，蠕变累积速度都不低。
蠕变的讨厌之处在于它不可逆：停机不恢复，变形是永久累积的。所以验证做「连续运转一千小时后的叶形复测」——叶尖位移量和动平衡变化量是两个硬指标。
材料上的应对按转速分档：低速风扇（<1000 rpm）矿物填充 PP 够用；中速家用档玻纤增强 PP 或 PA66-GF30；高速工业风机和换气扇，叶轮走玻纤增强 PA 或金属轮。转速高一档，材料档位跳一级，这个映射关系基本固定。
还有一个现场坑：高温环境（厨房、厂房顶）加速蠕变一档，同型号风扇装在厨房顶上和装在卧室里，寿命差几倍——安装位置的环温要进选型输入，这是销售端最容易漏传的信息。
阻燃与耐候
换气扇装在浴室厨房，要走阻燃 V-0（电机长期通电）。
户外或半户外的排气扇要耐候——加炭黑或 UV 三件套。
浴室环境还有湿热和清洁剂，PA66 走耐水解牌号。这些要求叠加起来，换气扇的塑料件配置并不低。
电机支架与摇头机构
风扇的电机支架、摇头齿轮箱是结构件：支架走 PA66-GF30（要刚性和耐温），
摇头齿轮走 POM（要自润滑和尺寸稳定）。摇头机构的累积运行次数十年可达 10 万次，按疲劳设计。这一块的失效表现是摇头卡死或异响。
工程实测：4 条强制测试
测试1：蠕变对比。60℃ 20 MPa 1 万小时，PA66-GF30 蠕变 1%，PP-GF20 达 3%——工业风扇不用 PP。
测试2：动平衡。玻纤分布均匀的风叶不平衡量 0.1 g，分布不均的 0.5 g——影响噪音。
测试3：阻燃。换气扇外壳无卤阻燃 PP 达 V-0（1.6 mm）——必须阻燃。
测试4：摇头疲劳。摇头机构 10 万次，POM 齿轮无异常，PA66 齿轮吸湿后卡滞。
追问三连：采购最常问的三件事
一问：叶轮阻燃要不要做。 看品类安规：吊扇和工业换气扇大多不强制，取暖器配套的风轮必须 V-0，坐扇按品牌自定。行价：阻燃牌叶轮贵两成，噪音和刚性还略有牺牲——把阻燃叶轮装在不需要的位置，是买了个寂寞还赔了静音。
二问：户外风扇（庭院扇、壁扇）叶轮怎么选。 耐候是第一档：无耐候 PP 户外一年粉化。耐候 PP 或耐候 PA 加 UV 体系，另加低温韧性（北方户外春季开机）。户外件的寿命预期要跟渠道讲清楚，别按室内档承诺。
三问：电机支架和摇头机构的料。 支架要刚性加振动阻尼：PA66-GF30 主流，含矿物填充的牌阻尼更好、异响更小。摇头机构是「四连杆磨损位」，齿轮和连杆走含油 POM，润滑脂按十年免维护标定——摇头机构卡死是风扇售后第一大项，材料加润滑的组合投入，比售后翻新机划算。### 算一笔材料账：静音的钱从哪赚回来
风扇行业的材料账里，静音是最容易量化回报的一块，把它算清楚。
叶轮从通用牌换改性牌，单机材料差价 1.5 元。换来的：叶形十年不漂、动平衡稳定、噪声低 2 到 3 分贝。
2 到 3 分贝在零售端的定价差异：同配置静音款溢价 15% 到 20%，按一台 200 元的风扇算，溢价空间 30 元。材料投入 1.5 元，撬动 30 元的零售价差——杠杆率一比二十，家电行业里没有比这更好赚的钱。
评价区的数据更直接：风扇差评的高频词是「响」「嗡嗡声」，静音好评的关键词是「像没开一样」。电商算法把这两个词类的权重给得很高，好评聚类直接决定流量分配。
给风扇厂的建议：把「叶轮材料档位」和「整机噪声目标」绑定进设计输入，而不是先定价格再倒推材料。反向做的厂，最后都会在噪声这条线上卡住——噪声是材料的函数，倒推不出便宜又安静的组合，物理规律不给这个面子。### 边界声明
| 工况 | 推荐材料 |
|---|
| 落地台风叶 | PP-GF20 或 AS |
| 换气扇风叶 | PA66-GF30 耐水解 |
| 户外排气扇 | PA66-GF30 + 耐候 |
| 电机支架 | PA66-GF30 |
| 摇头齿轮 | POM |
工程备忘
风扇件量产前必须做蠕变 + 动平衡 + 阻燃三项。按蠕变后的尺寸校核叶尖间隙，否则会扫膛。
实战案例：常见踩坑与正解
踩坑一：按常温物性表给风扇件选料，没考虑长期工作温度。家电件长期在 60-90℃ 下工作，常温强度再高也会热老化失效。正解：拿热老化后的数据选料，PA66 在 80℃ 长期工作要选耐热氧老化牌号。踩坑二：为了降本把增强料换成未增强料，或者把 GF30 降到 GF15。风扇件的玻纤含量是算出来的，不是拍出来的。正解：降玻纤含量必须重算蠕变和强度，不能凭经验。踩坑三：噪音和异响问题最后才查，发现是塑料件摩擦或松动。正解：家电的噪音投诉占比很高，塑料件的配合公差和自润滑要在设计阶段就定。
反向案例：厂房顶上早衰的换气扇
2024 年，华南某食品厂车间的屋顶换气扇批量报修：装了三年的四十六台，噪音和振动明显增大，检修发现叶轮普遍变形，动平衡块都救不回来。
叶轮料是按室内档选的玻纤增强 PP，没按「屋顶环温 60℃ 加全天运转」这个真实工况升档。车间顶部的铁皮屋面夏天晒透，换气扇壳内温度比设计假设高了 15℃——蠕变速率翻倍不止，三年走了别的机器六年的路。
换装按高温工况升档：玻纤增强 PA66-GF30 叶轮加耐高温轴承。单价贵了三成，按全天运转的折算寿命回到八年以上。
采购复盘时说了句实在话：「我们选料的时候拿着产品说明书选，说明书上写的是常温。」工况信息在销售到采购的传递里丢了一环，材料就用真实的失效把这一环补了回来——只是补课费是四十六台换轮加两次登高作业。
旋转件的选型表里，「安装环境温度」这一栏不是可选项。漏了它，材料的账就记在了维修单上。### 延伸判断：最容易被漏掉的隐性变量
风扇件的量产事故里，有一半不是料选错了，是隐性变量没控住。第一个变量是含水率。
PA 系材料出厂含水率、干燥条件、注塑前的存放时间，三者共同决定实际含水率，含水率不对，强度和外观都会变。
第二个变量是模具温度。模温低 20℃，表面浮纤和熔接痕强度可能差一倍。
第三个变量是装配后的时间。装完 24 h 和装完 30 天的扭矩、尺寸、密封压缩量都不一样。
这三个变量都不写在物性表上，但都写在失效报告里。
把这三件事写成一张表发给供应商，比打十通电话有用——风扇件的选型沟通成本，基本都花在这几项反复确认上。
最后一组问答：三个纠结时刻的裁决
纠结一：风扇价格战打到极致，材料还能动吗。 能动的是结构：第一层的叶轮和电机支架不动，风叶外的结构件（网罩衬套、底座配重件）逐个优化。价格战里材料档位的守纪律，是售后曲线平稳的前提——降档省的钱在售后账上连本带利还回去。
纠结二：户外风扇被投诉「一个夏天就响」。 按工况升级而不是按渠道升级：户外机叶轮直接配耐候加高温档，销售端把「室内款户外用」的工况警告写进说明书。工况错配的锅，材料不背——但要提前说破。
纠结三：摇头机构要不要上「终身润滑」概念。 概念别追，实功要做：含油 POM 加十年标定脂的组合按免维护档配置，宣传用「十年免加油」这种可验证表述。「终身」两个字在售后条款里是负债，在消费者心里是信任——用「十年」拿到信任，把「终身」留给律师。### 补记：三个现场判断信号
信号一：运转噪音渐大、叶尖可见变形。 蠕变加动平衡漂移，整批换高一档刚性牌，动平衡复测不可省。
信号二：摇头机构卡顿异响。 磨损位润滑耗尽或料磨耗超标，含油 POM 加十年标定润滑脂，组合改。
信号三：户外机一年内叶轮褪色发脆。 耐候缺失，粉化在前，断裂在后，趁断裂前换耐候牌。### 验证顺序：三步走完再下单
第一步，对转速：按叶轮转速定材料档，转速高一档材料跳一级，这条映射别省。
第二步，验蠕变：连续运转一千小时叶形复测，叶尖位移量是硬指标。
第三步，验噪音：消音室噪声曲线加用户场景听感双验收，数据的分贝和耳朵的判断都要过。三步走完，风扇的静音卖点才站得住。
结语
副牌料到底能不能用——选料这件事，越早问越省事。
这类件的选料与试模，可以一起聊。
185 Fan and ventilation fan components
The operating condition of fan components is long-term rotation
Fans and ventilation fans run for over a thousand hours a year, with rotors subjected to centrifugal force + vibration for extended periods.
The core failure mechanism in this condition is creep and fatigue, not a single strength cycle. After creep, the fan blades deform, dynamic balance is disrupted, noise increases, and airflow decreases. The starting point for material selection is long-term creep data.
Fan material selection
Floor fan and platform fan blades: diameter 300-400 mm, speed 1000-1400 rpm, using PP-GF20 or AS (styrene-acrylonitrile). PP-GF is cheap, has good toughness, and acceptable creep. Ventilation fan and exhaust fan blades: Use PA66-GF30 or ABS, must be temperature-resistant (bathroom 60-70°C) + flame-retardant. Industrial fan blades: use PA66-GF30 or fiberglass reinforced PP, requiring strength and weather resistance.
On-site Replica: Silent Fan Blade Silence
In June 2025, in the anechoic room of a fan factory in Dongguan, engineers made a comparison for us: two fans running at the same speed, one with obvious "rustling" blade tip noise, and the other much quieter.
The difference lies in the impeller: the Noise model uses a regular PP impeller, which heats up and adds centrifugal force, causing slight deformation at the tip and dynamic balance drift—less than 1 gram, noticeable to the human ear. The quiet model is a fiberglass-reinforced PP-modified brand, with higher rigidity and better blade shape.
In the fan category, price wars are at its peak, with material costs often pushed to just a few cents per level, but the premium for silent fans is real: for fans with the same configuration, silent models retail 15-20% higher, and the keyword in the review section is "quiet."
The impeller material selection bill ends up like this: modified brands cost 1.5 yuan more than generic brands, but in return, the blade shape won't drift for ten years, dynamic balance is stable, and the noise curve is smooth—this can be recouped twice as much on the retail end.
Fans are the textbook category of 'long-term rotating parts': all the materials science related to creep, fatigue, dynamic balance, and noise can be applied to a single leaf. To tell new buyers, let's start with this leaf.
Creep is the key to design
Wind blades rotate for long periods under centrifugal force, and the creep at the blade tip causes the blade to stretch and deform.
PA66-GF30 creeps about 1% at 20 MPa and 60°C for 10,000 hours, while PP-GF20 has 3% creep under the same conditions.
This is why industrial fans do not use PP. During design, the blade tip clearance must be checked according to the creep dimensions; if the gap is too small, it will cause cavity scraping.
The three sources of noise
Fan noise comes from aerodynamic noise, motor noise, and structural resonance. Plastic parts affect the latter two: fan blade dynamic balance (material density uniformity), support stiffness (glass fiber content), and connection damping (vibration damping with TPE pad ).
Material density uniformity of the fan blade is crucial—uneven glass fiber distribution directly leads to poor dynamic balance.
Deeper layer: Creep—the invisible killer of fan components
Talking fans and ventilation fans, explaining the specific performance of creep in these products, because it is the watershed for selecting rotating parts.
When the fan impeller rotates, each blade is subjected to centrifugal force, with the highest root stress. Ordinary plastics slowly stretch and deform under continuous centrifugal stress at room temperature—the blades gradually "spread out," leaf shape angles drift, airflow drops mildly, and vibration and noise caused by dynamic balance disruption are the main issues.
Fan blades running continuously in summer and industrial ventilation fans spinning 24 hours both have high creep accumulation rates.
Creep is annoying because it is irreversible: if it stops and does not recover, deformation accumulates permanently. Therefore, verify "blade shape re-measurement after 1,000 hours of continuous operation"—blade tip displacement and dynamic balance change are two hard indicators.
Material responses are classified by speed: low-speed fan (<1000 rpm) mineral-filled PP is sufficient; medium-speed household mode fiberglass-reinforced PP or PA66-GF30; high-speed industrial fans and ventilation fans, impellers use fiberglass-reinforced PA or metal wheels. One higher speed level means a step in material gear; this mapping relationship is basically fixed.
Another on-site pitfall: in high-temperature environments (kitchen, factory roof), creep accelerates by one level. Fans of the same model installed on the kitchen ceiling versus in the bedroom have several times the lifespan difference — the ambient temperature at the installation location must be input in the model selection, which is the most easily missed information on the sales side.
Flame Retardant and Weather-Resistant
Exhaust fans installed in bathrooms and kitchens must use flame-retardant V-0 (motor powered long-term).
Outdoor or semi-outdoor exhaust fans must be weather-resistant—add carbon black or UV three-piece sets.
Bathroom environments also have humid heat and detergents; PA66 is classified as hydrolytic-resistant. Combining these requirements, the plastic parts of the exhaust fan are not low.
Motor Bracket and Oscillating Head Mechanism
The motor bracket and oscillator gearbox of the fan are structural components: brackets use PA66-GF30 (must be rigid and temperature-resistant),
Oscible gears use POM (must be self-lubricating and dimensionally stable). The cumulative operation of the oscillating head mechanism can reach 100,000 times over several decades, designed for fatigue. Failure in this area manifests as oscillating head sticking or abnormal noises.
Engineering Testing: 4 mandatory tests
Test 1: Creep comparison. At 60°C 20 MPa for 10,000 hours, PA66-GF30 creep reaches 1%, PP-GF20 reaches 3%—industrial fans do not use PP.
Test 2: Dynamic balancing. Evenly distributed glass fiber blades have an imbalance of 0.1 g; uneven distribution 0.5 g — affects noise.
Test 3: Flame retardancy. Halogen-free flame-retardant PP of the exhaust fan casing reaches V-0 (1.6 mm)—must be flame-retardant.
Test 4: Oscillating head fatigue. After 100,000 cycles of the oscillating mechanism, POM gears show no abnormalities; PA66 gears become stuck after moisture absorption.
Follow-up triple questions: The three most frequently asked questions in procurement
First question: Should the impeller be flame-retardant? Check product safety regulations: ceiling fans and industrial ventilation fans are mostly not mandatory, heater fan must have V-0 rating, seat fan depends on the brand. Market price: flame-retardant brand impellers are 20% more expensive, with some sacrifice in noise and rigidity—installing flame-retardant impellers where you don't need them is a waste of buying and losing out on silence.
Question 2: How to choose an impeller for outdoor fans (courtyard fans, wall fans). Weather resistance is the first tier: non-weather-resistant PP outdoor will chalk for one year. Weather-resistant PP or weather-resistant PA with UV system, plus low-temperature toughness (northern outdoor spring startup). Specify the expected lifespan of outdoor parts clearly with the channel; don't rely on indoor spec promises.
Question 3: Materials for motor brackets and nocble head mechanisms. The bracket should be rigid with vibration damping: PA66-GF30 is mainstream, mineral-filled models have better damping and less abnormal noise. The oscillating head mechanism uses the "four-link wear position," gears and connecting rods use oil-containing POM, and the grease is rated for ten years maintenance-free — oscillating mechanism jamming is the top after-sales item for fans. The combined investment of materials and lubrication is more cost-effective than refurbished after-sales machines. ### Doing the math: Where does the money from quietness come from ?
In the fan industry's material ledger, quietness is the easiest to quantify returns, so calculate it clearly.
The impeller switches from a generic brand to a modified brand, with a single-unit material price difference of 1.5 yuan. What you get in return: blade shape won't drift for ten years, stable dynamic balance, and low noise by 2 to 3 decibels.
2 to 3 decibel retail price difference: the same configuration silent model incurs a 15% to 20% premium, and for a 200 yuan fan, the premium margin is 30 yuan. Material investment of 1.5 yuan leverages a 30 yuan retail price difference—leverage ratio of 1 to 20, no better profit in the home appliance industry
's data in the review section is even more direct: the high-frequency keywords for fan negative reviews are 'echo' and 'buzzing,' while the keywords for silent positive reviews are 'as if it's not open.' E-commerce algorithms give these two categories a high weight, and clustering positive reviews directly determines traffic distribution.
Advice for fan manufacturers: bind 'impeller material level' and 'overall machine noise target' into design input, rather than setting prices first and then working backwards. Factories that do reverse will eventually get stuck on the noise line—noise is a function of the material, and you can't get a cheap and quiet combination backwards; physics won't give you any face. ### Boundary Declaration
| Operating Condition | Recommended Materials |
|---|
| Typhoon Blade | PP-GF20 or AS |
| Ventilation Fan Blade | PA66-GF30 Hydrolysis Resistant |
| Outdoor Exhaust Fan | PA66-GF30+ Weather Resistance |
| Motor bracket | PA66-GF30 |
| Oscillating gear | POM |
Engineering memo
Before mass production of fan components, creep + dynamic balancing + flame retardant must be performed. Check the blade tip gap based on the creep dimensions; otherwise, the chamber will be scraped.
Practical Case: Common pitfalls and correct answers
Pitfall 1: Selecting fan components according to the room temperature physical property table without considering long-term operating temperature. Appliances operate long-term at 60-90°C; no matter how high the room temperature strength is, thermal aging will cause failure. Correct answer: Use data after thermal aging to select materials. For PA66 working long-term at 80°C, choose grades resistant to thermal and oxygen aging. Pitfall 2: To reduce costs, replace reinforcing with unreinforced materials, or downgrade GF30 to GF15. The glass fiber content of fan components is calculated, not just photographed. Correct answer: Reducing glass fiber content requires recalculating creep and strength, not relying on experience. Pitfall 3: Noise and abnormal noise issues Only after investigation did they find it was plastic parts rubbing or loosening. Correct answer: Noise complaints account for a high proportion of home appliance complaints, so the fit tolerances and self-lubrication of plastic parts must be determined during the design stage.
Reverse Case: Prematurely Aging Ventilation Fan on Factory Ceiling
In 2024, a roof exhaust fan in a food factory workshop in South China was repaired in bulk: forty-six units installed for three years, noise and vibration increased significantly, and the impeller was found to be generally deformed, and the dynamic balance block couldn't be saved.
The impeller material was selected as fiberglass reinforced PP for indoor settings, but it didn't upgrade under the real operating condition of 'roof ambient temperature 60°C plus all-day operation.' The metal roof on the workshop roof was exposed to summer heat, and the temperature inside the exhaust fan shell was 15°C higher than designed—creep rate more than doubled, and three years took the same six years as other machines did.
Upgraded to high-temperature conditions: fiber-reinforced PA66-GF30 impeller with high-temperature bearings. The unit price was 30% higher, and based on all-day operation, the lifespan was back to over eight years.
During the procurement review, he said honestly: "When selecting materials, we used the product manual, which said room temperature." The operating condition information was lost in the transmission from sales to procurement, so the material compensated for it with real failures—the only compensation was forty-six wheels replaced and two high-altitude operations.
In the rotating parts selection table, the "installation environment temperature" column was not optional. If it is missed, the material will be recorded on the repair order. ### Further Judgment: The Most Easily Overlooked Hidden Variable
In mass production accidents involving fan parts, half of them are not due to material selection errors but because the hidden variable is not controlled. The first variable is moisture content.
PA is the actual moisture content of the material at the factory, drying conditions, and storage time before injection molding. If the moisture content is incorrect, strength and appearance will change.
The second variable is mold temperature. If the mold temperature is 20°C lower, the surface float fiber and weld mark strength may differ by half.
The third variable is the time after assembly. Torque, size, and seal compression amount after installation differ between 24 hours and 30 days after installation.
None of these three variables are listed in the physical property table, but they're all in the failure report.
Writing these three things into a single sheet and sending it to suppliers is more effective than making ten phone calls—the cost of fan component selection and communication is basically spent on repeated confirmations of these items.
The final Q&A: The verdict at three moments of dilemma
Dilemma One: If the fan price war reaches its peak, can the materials still be moved? What can be moved is the structure: the first-layer impeller and motor bracket remain unchanged, while the structural parts outside the fan blades (mesh bushings, base counterweight parts) are optimized one by one. Discipline in material tiers in the price war is the prerequisite for a stable after-sales curve—the money saved from downgrading is returned to the after-sales account with interest.
Dilemma 2: Outdoor fans complained about "sounding in just one summer." Upgrading by operating conditions rather than by channel: outdoor machine impellers are directly paired with weather resistance and high-temperature settings, and the sales side writes the "indoor and outdoor use" condition warning in the manual. If the operating conditions are mismatched, don't blame the material—but you need to point it out in advance.
Dilemma 3: Should the ossip-based mechanism introduce the concept of "lifetime lubrication"? Don't chase the concept, focus on the real work: a combination of oil-containing POM and ten-year graded grease configured as maintenance-free, promoted with verifiable phrases like "ten years no refueling." The word "lifetime" in after-sales terms means liability, but in the consumer's mind, it means trust—gain trust with "ten years," leave "lifetime" to lawyers. ### Additional notes: Three on-site judgment signals
Signal One: Increasing operating noise, visible blade tip deformation. Creep plus dynamic balance drift, batch replacement by one higher rigid plate, dynamic balance retest cannot be skipped.
Signal Two: Oscillation mechanism stutters abnormal noise. Wear point lubrication exhausted or material wear exceeds standards, oil-containing POM plus ten-year calibration grease, combine and revise.
Signal Three: Outdoor machine impeller fades and becomes brittle within one year. Weather resistance loss, pulverization first, fracture later; replace the weathering plate before breakage. ### Verification sequence: Complete all three steps before placing an order
Step one: Adjust speed: set material settings according to impeller speed; higher speed allows material to skip one level. Don't skip this mapping.
Step two, creep test: Blade shape re-testing after 1,000 hours of continuous operation, blade tip displacement is a hard indicator.
Step three, noise test: Noise curve from the anechoic chamber combined with user scenario hearing evaluation. Both decibels and ear judgment must pass. After completing these three steps, the fan's quiet selling point can be established.
Conclusion
Can secondary brand materials be used? — The earlier you ask about material selection, the easier it is.
For material selection and mold trials for these types of pieces, you can chat together
