81 空调外机风扇与底座：长期户外 + 高湿 + 振动三工况怎么选
一、空调外机风扇的工况
空调外机的风扇（轴流风扇叶）是家电里工况密集的件：
长期户外暴露（阳光、雨水、湿气、热循环）。
高速旋转（500-1500 rpm）。
高湿 + 雨水。
温度：-20℃ 到 70℃ 范围。
寿命：≥10 年（家用外机）。
这五项放在一起是耐候 + 抗振 + 户外长期寿命 + 高低温循环。
七月的楼顶平台是空调外机件的天然考场。有个安装商说过一件事：同一批外机，装在南向墙面的风扇叶片三年如新，装在西晒天井里的第二年就开始发黄发脆。太阳的朝向账，材料最先知道。
后来他们在批量采购单上把安装环境分成三档：普通遮蔽、半暴露、全天西晒。第三档的风叶与网罩指定高耐候配方，单件贵几块钱，换来的投诉少了整整一个售后季。
他说得很实在：材料费是按件算的，投诉是按季算的，这笔账小学数学就能算明白。
二、风扇叶料的选型路径
① PA66-GF30 + UV 稳定剂 + 黑色
家电外机风扇的主流方案。价格中等，性能覆盖大多数工况。
② PA66-GF35 + UV + 增韧
高端机型用，抗冲击 + 抗振更好。大风量、高转速工况。
③ PPA-GF30 + UV
耐温更高，户外长期表现更稳。温带地区 + 高端机用。
④ PA6-GF30 + UV
价格最低，但长期寿命 5-7 年，与 PA66-GF30（10 年）有明显差距。
三、关键性能对照
| 指标 | PA6-GF30 | PA66-GF30 | PPA-GF30 |
|---|
| 长期户外 | 中 | 好 | 极好 |
| 抗振 | 中 | 好 | 极好 |
| 高低温循环 | 中 | 好 | 极好 |
| 高速旋转 | 中 | 好 | 极好 |
| 单价 | 1.0× | 1.4× | 3.0× |
四、四个常见坑
① 黑色不够黑
外机风扇必须碳黑充分（建议 2-3% 碳黑 + UV 稳定剂）。碳黑不到位的户外 1-2 年开始脆化。
② 玻纤取向不均
风扇叶是异形件，玻纤取向不均 → 振动下一边应力集中 → 早期疲劳。模具设计要特别关注熔接线位置。
③ 模具温度低
PA66-GF30 注塑模温 80-100℃ 起步，低于 80℃ 时玻纤裸露、表面变白。模具温控是必要的成本。
④ 装配公差不到位
风扇叶静平衡公差 / 装配轴公差，任一偏差都放大成振动。这是为什么风扇件要测静平衡 / 动平衡。
五、底座与其他件
空调外机底座常用 PA66-GF30 + UV（承重 + 户外）。比风扇叶工况松，普通方案即可。
外壳用 ASA / PMMA + UV 抗老化（外观件，与本篇 PA 不直接相关）。
六、边界声明
| 工况 | 建议 |
|---|
| 普通家用外机 | PA66-GF30 + UV + 黑色 |
| 高端 / 高转速 | PA66-GF35 + UV |
| 高端长期 / 温带气候 | PPA-GF30 + UV |
| 价格敏感低端 | PA6-GF30 + UV（寿命较短） |
一批风叶断裂的追凶记录
起点是某外机项目的风叶用普通增强 PA6，台架与整机测试都过。
潜伏期一年多，零售渠道零投诉。爆发在第二年台风季，沿海地区连续报修，风叶根部裂纹，有一台直接碎片脱落打穿了防护网。
排查走了一圈：先查注塑工艺，玻纤取向均匀；再查装配，动平衡在规格内。最后把断叶送检，老化黄变指数超标——紫外与湿热把材料的冲击韧性吃掉了一半，台风天的负荷只是压垮它的最后一根稻草。
结算动作：风叶换高耐候增强牌号，根部圆角加大，把氙灯老化与湿热循环写进双工况验收。之后三个台风季风平浪静。
外机件的会议，三个追问定调。
追问一：安装区域按哪档算？ 西晒与沿海按最严档配材料。
追问二：风叶的共振频率测过吗？ 材料模量变化会移频，改料要做动平衡复测。
追问三：底盘承载与盐雾兼顾吗？ 沿海项目底盘料加耐盐雾评级。
延伸：常见问题与排查
外机风扇的常见问题集中在四类：
问题一：风扇叶脆化
一般是 UV 不到位的 PA66-GF30。长期户外 2-3 年后玻纤裸露、变脆。第一步排查：碳黑含量（建议 ≥2.5%），不足的换配方。第二步：UV 稳定剂体系（苯并三唑类 + HALS 双体系较稳）。
问题二：振动超标
熔接线位置 + 玻纤取向不均 → 高转速下振动放大。第一步：模具浇口位置调整（避开最大熔接线位置）；第二步：玻纤含量从 GF30 上调到 GF35。
问题三：底座振动传递
底座是承重件不是受力件，不要为了强度上 GF30 而失去减振性能。GF20 + UV 是家电底座的常见配比。
问题四：焊接 + 户外老化叠加
焊线位置在 UV 暴露下 3-5 年先脆化。焊线专用料 + UV 配方组合 才能撑过 10 年。
这四条之外还有"动平衡"测试——风扇叶必须做 G2.5 以上动平衡，否则 1500 rpm 工况下振动加速度放大 5-10 倍。
实战：三个工程测试
测试一：UV 老化 3000 小时。户外 5 年等效 ≈ 3000 小时氙灯老化。PA66-GF30 + 2.5% 碳黑 + UV 稳定剂：弯曲强度保留率 ≥80%。未加碳黑的：600 小时已发脆。
测试二：1500 rpm 离心力长期运行。5000 小时以上，PA66-GF30 风扇叶：动平衡位移 ≤0.5 mm。PA-GF 翘曲或玻纤裸露会放大振动。
测试三：低温 -20℃ 冲击。冬季户外工况，PA66-GF30 + 增韧：缺口冲击 ≥15 kJ/m²。未增韧的 PA66-GF30：≤8 kJ/m²。
测试都过了，再进入量产。少一项，量大后必出问题。
关键提示
空调外机风扇量产前必须做UV 3000 小时氙灯老化 + 1500 rpm 离心力长期运行。碳黑含量 ≥2.5% + UV 稳定剂双体系 是抗老化基本盘，缺一项 3-5 年内老化脆化。
工程备忘
外机风扇叶的"脆化"几乎全因 UV + 碳黑没到位。通用 PA66-GF30 不加碳黑 + UV → 2-3 年发脆。加 2.5% 碳黑 + UV 稳定剂双体系 是稳的方案。
行业感
空调外机风扇量产前必须做UV 3000 小时 + 1500 rpm 离心力 5000 小时两项测试。碳黑不足的 PA-GF + UV 3 年发脆。
收尾补一张三问三答。
| 高频问题 | 一句话回答 |
|---|
| 风叶用 PA66 还是 PA6？ | 高刚长寿命选 PA66 体系，成本机型 PA6 改性 |
| 底盘要防锈吗？ | 塑料底盘不生锈，但要抗蠕变与耐候 |
| 网罩会锈吗？ | 塑网罩不锈，刚性与耐候双指标 |
| 老化验证多久？ | 氙灯两千小时起，沿海机型加湿热 |
补一个关于动平衡的细节： 风叶换料之后，即使尺寸不变，材料的模量与比重变了，整叶的振动特性也会漂移。有厂子换料后没做动平衡复测，装机的噪音投诉集中在某个转速段，追了两个月才发现是换料带来的频移。换料不是替换，是重新开始一轮平衡验证——这句话在外机项目上值一遍完整的测试排期。
深一层：外机件的现场知识
空调外机的工况，行业里叫三高一循环：高温、高湿、高紫外，加上冬夏的温度大循环。风叶、网罩、底盘三类塑料件都在这三高一循环里泡着，但各自的受力模式不同，选型的重心也不同。风叶是旋转件，怕模量衰减带来的频移与动平衡漂移；
网罩是结构件，怕冲击韧性的老化下降；底盘是承载件，怕蠕变与盐雾。三件事三副药，一套通用配方走天下的想法，在外机上一定吃闷亏。
风叶的老化失效有个规律：先黄变，后变脆，最后在某个负荷峰值断裂。从黄变到断裂通常还有半年的窗口期，这半年就是售后追责与整改的窗口。我们建议售后端把风叶颜色纳入巡检项，黄色指数超标的批次提前换件，比断裂后的赔偿与声誉损失便宜得多。
有区域经销商做过对比，主动换件的成本是被动赔付的三分之一，这笔账在售后部门内部流传很广。
底盘的蠕变是外机件里最沉默的失效。压缩机启动的抖动日复一日传到底盘，塑料的蠕变让支撑面缓慢变形，表现是外机逐渐倾斜、铜管应力增大、最后焊点疲劳开裂。
蠕变测试要按十年寿命做加速，数据不好看的料，加厚也补不回来，因为蠕变与应力水平相关，加厚降应力才是正解。底盘件的设计余量，宁大勿小。
盐雾对沿海项目是隐藏关卡。塑料本身不锈，但塑料件上的金属嵌件与紧固件会锈，锈蚀的胀力反过来把塑料胀裂。这个失效模式叫嵌件胀裂，在沿海的售后件里不少见。解法是嵌件选不锈钢或做镀层，塑料侧做嵌件拉拔与盐雾联合测试。
塑料与金属的交界处，永远是最容易出问题的位置，外机件如此，所有结构件都如此。
外机的安装高度还带来一个冷知识：高层的风载荷比地面大得多，强风天外机的振动幅度也大，塑料件的疲劳寿命在高楼层上打折扣。同一批外机装在三十层与装在一楼，塑料件的售后率能差出一截。
区域化的材料方案听起来奢侈，但把楼层因素加进工况表，只需要在采购规格里多一档，成本几乎为零。
装配端的教训也值得记：外机塑料件用的是自攻螺丝，扭力过大会把塑料座拧滑丝。滑丝的座子在风振里慢慢松脱，零件掉了才知道。
扭力批是外机装配线的基本配置，塑料件的扭力上限印在作业指导书第一页，这几块钱的投入，防的是几十块的赔偿与上百块的上门成本。
网罩这类安全件还有法规维度：防护网的开隙与强度有标准要求，塑料网罩的强度验证要按标准做，不能拿手感代替。有客户的塑料网罩在第三方抽检里强度不达标，整批退货改料，损失的那批货用的还是玻纤含量不足的降本料。
安全件的钱不能省，这句话在外机项目上被验证过太多次。
收尾说一个选型的心法：外机件的材料表，建议按"谁先坏"排序而不是按"谁贵"排序。风叶的耐候、底盘的蠕变、网罩的韧性，各自的老化速度不一样，把钱花在最先老化的件上，整机的售后曲线最平。
这套排序法在两个整机厂的项目里用过，售后成本核算下来，比平均主义用料的方案低两成。材料预算不是切蛋糕，是排顺序。
外机件还有一笔季节性的账要算：夏季用电高峰与冬季化霜，让外机的温度循环比气候本身更频繁。化霜程序一小时一次的机型，塑料件一天经历的冷热往返是几十次，比温带气候的自然循环密一个量级。
验证方案里的循环次数要按机器自身的程序节奏算，不按气候算，这是外机件与户外结构件在验证思路上的本质区别。有一年一个出口机型按目标市场的气候做的循环验证，进口到另一个多霜地区后故障率抬头，复盘的结论就是循环次数算错了基准。
工况跟着程序走，不跟着地图走，这句话记下来，能避开一整类验证事故。
结语
空调外机风扇是 PA66-GF30 + UV 方案的"标准工况"。别用 PA6，长期户外撑不到 10 年；也别只看 UV 配方不看碳黑含量，真正抗老化要"碳黑 + UV 稳定剂"双管齐下。
你手上的风扇 / 底座，户外暴露年限和转速两个参数定下来，大方向就能定。
十几年，只做一件事：把尼龙改成能用的样子。
家电外机件长期料号选择，可以一起聊。
81 Air Conditioner Outdoor Unit Fan and Base: How to Choose for Long-Term Outdoor, High Humidity, and Vibration Three Conditions
1. Operating conditions of the air conditioner outdoor unit fan
The fan of the air conditioning outdoor unit (axial fan blade) is a component with intensive operating conditions in household appliances:
Long-term outdoor exposure (sunlight, rain, moisture, heat cycles).
High-speed rotation (500-1500 rpm).
High humidity Rainwater.
Temperature: Range from -20℃ to 70℃.
Lifespan: ≥10 years (household outdoor unit).
These five items together are weather resistance, vibration resistance, long-term outdoor life, and high-low temperature cycling.
The rooftop terrace in July is the natural testing ground for air conditioning outdoor units. An installer once mentioned something: the same batch of units, with fans mounted on the south-facing wall, look as new after three years, while those installed in a west-facing sunlit courtyard start yellowing and becoming brittle in the second year. The orientation of the sun is something that materials are the first to know.
Later, they divided the installation environments on the bulk purchase orders into three categories: ordinary sheltered, semi-exposed, and full western sun exposure. For the third category, the fan blades and mesh covers were specified with a high weather-resistant formulation, costing a few more yuan per piece, which resulted in significantly fewer complaints throughout an entire after-sales season.
He spoke very frankly: material costs are calculated per item, and complaints are calculated quarterly. Even elementary school math can figure out this account.
2. Selection Path for Fan Blade Materials
① PA66-GF30 UV stabilizer black
The mainstream solution for home appliance outdoor unit fans. Medium price, performance covers most working conditions.
② PA66-GF35 UV Toughened
Used for high-end models, better impact and vibration resistance. Large air volume, high-speed operating conditions.
③ PPA-GF30 UV
Higher temperature resistance, more stable long-term performance outdoors. Suitable for temperate regions, used in high-end machines.
④ PA6-GF30 UV
The price is the lowest, but the long-term lifespan is 5-7 years, which is significantly different from PA66-GF30 (10 years).
3. Key Performance Comparison
| Indicator | PA6-GF30 | PA66-GF30 | PPA-GF30 |
|---|
| Long-term outdoor | middle | Good | Excellent |
| Vibration-resistant | middle | Good | Excellent |
| High and low temperature cycling | middle | Good | Excellent |
| high-speed rotation | middle | Good | Excellent |
| Unit price | 1.0× | 1.4× | 3.0× |
4. Four Common Pitfalls
① Black is not black enough
The outdoor unit fan must have sufficient carbon black (recommended 2-3% carbon black and UV stabilizer). If the carbon black is insufficient, the outdoor unit will begin to become brittle in 1-2 years.
② Uneven glass fiber orientation
The fan blade is an irregular part, and the fiberglass orientation is uneven → stress concentration on one side under vibration → early fatigue. Mold design should pay special attention to the weld line location.
③ Low mold temperature
PA66-GF30 injection molding mold temperature starts at 80-100℃. Below 80℃, fiberglass is exposed and the surface turns white. Mold temperature control is a necessary cost.
④ Assembly tolerance is not in place
Fan blade static balance tolerance / assembly shaft tolerance, any deviation is amplified into vibration. This is why fan components need to be tested for static balance / dynamic balance.
5. Base and Other Parts
The outdoor air conditioner unit base commonly uses PA66-GF30 UV (load-bearing, outdoor). The operating conditions are less demanding than those of fan blades, so a standard solution is sufficient.
The housing uses ASA/PMMA with UV anti-aging (exterior parts, not directly related to this PA).
6. Boundary Statement
| Operating condition | Suggestion |
|---|
| Ordinary household outdoor unit | PA66-GF30 UV Black |
| High-end / High-speed | PA66-GF35 UV |
| High-end Long-term / Temperate Climate | PPA-GF30 UV |
| Price-sensitive low-end | PA6-GF30 UV (shorter lifespan) |
A batch of records of pursuits involving broken fan blades
The starting point was using regular reinforced PA6 for the blades of a certain external machine project, and both bench tests and full machine tests passed.
The incubation period lasted more than a year, with zero complaints in the retail channels. The outbreak occurred in the typhoon season of the second year, with continuous repair reports from coastal areas. Cracks appeared at the base of the fan blades, and one unit had fragments directly break off, puncturing the protective net.
Investigation went in a full circle: first, the injection molding process was checked, and the fiberglass orientation was uniform; then the assembly was checked, and the dynamic balance was within specifications. Finally, the broken blade was sent for inspection, and the aging yellowing index exceeded the limit — ultraviolet rays and humidity had reduced the material's impact toughness by half, and the load during the typhoon was just the last straw that broke it.
Settlement actions: Replace the fan blades with high weather-resistant reinforced grades, enlarge the root fillet, and include xenon lamp aging and damp heat cycling in dual-condition acceptance. After that, three typhoon seasons are calm.
A meeting on external machine parts, three follow-up questions set the tone.
Follow-up Question 1: Which standard should the installation area follow? For west-facing sun exposure and coastal areas, use materials according to the strictest standard.
Follow-up question 2: Has the resonance frequency of the wind blades been measured? Changes in material modulus will shift the frequency, and if the material is changed, dynamic balancing needs to be re-checked.
Follow-up Question 3: Can the chassis support and salt spray resistance be balanced? For coastal projects, the chassis material should have a salt spray resistance rating.
Extension: Common Problems and Troubleshooting
Common problems with outdoor unit fans are concentrated in four categories:
Question 1: Brittle fan blades
Generally, it is PA66-GF30 with insufficient UV protection. After 2-3 years outdoors, the glass fibers become exposed and brittle. First step for investigation: carbon black content (recommended ≥2.5%), if insufficient, change the formulation. Second step: UV stabilizer system (benzotriazole type + HALS dual system is more stable).
Question 2: Vibration Exceeding the Limit
Weld line position Uneven glass fiber orientation → Vibration amplification at high speeds. Step 1: Adjust the mold gate position (avoid the location of the maximum weld line); Step 2: Increase the glass fiber content from GF30 to GF35.
Question 3: Base Vibration Transmission
The base is a load-bearing component, not a stress-bearing part. Do not sacrifice vibration-damping performance for strength by using GF30. GF20 UV is a common formulation for household appliance bases.
Question 4: Welding Outdoor aging overlap
The wire bonding position becomes brittle after 3-5 years of UV exposure. Only a combination of wire bonding material + UV formulation can survive 10 years.
Besides these four tests, there is also a "dynamic balance" test—the fan blades must be dynamically balanced at G2.5 or higher; otherwise, vibration acceleration at 1500 rpm is amplified 5-10 times.
Practical Use: Three engineering tests
Test One: UV aging for 3000 hours. Outdoor 5-year equivalent ≈ 3000 hours of xenon lamp aging. PA66-GF30 + 2.5% carbon black + UV stabilizer: bending strength retention rate ≥80%. No carbon black: brittleness after 600 hours.
Test 2: Long-term operation at 1500 rpm centrifugal force. Over 5000 hours, PA66-GF30 fan blades: dynamic balance displacement ≤0.5 mm. PA-GF warping or exposed glass fiber amplify vibration.
Test 3: Low temperature -20°C impact. Winter outdoor conditions, PA66-GF30 + toughened: notch impact ≥15 kJ/m². Untoughened PA66-GF30: ≤8 kJ/m².
All tests passed, then mass production begins. Missing one means problems will occur when the volume increases.
Key Tips
Before mass production of outdoor air conditioner fans, UV 3000 hours xenon lamp aging + 1500 rpm centrifugal force for long-term operation is required. Carbon black content ≥2.5% + UV stabilizer dual system is the foundation for anti-aging; missing one is brittleness within 3-5 years.
Engineering Memo
The "brittleness" of outdoor unit fan blades is almost entirely due to insufficient UV + carbon black. General PA66-GF30 without carbon black + UV → becomes brittle in 2-3 years. Adding 2.5% carbon black + UV stabilizer dual system is the stable solution.
Industry Sensibility
Before mass production of air conditioner outdoor units, you must do two tests: UV 3000 hours + 1500 rpm centrifugal force for 5000 hours. PA-GF + UV with insufficient carbon black becomes brittle after 3 years.
Adding a three-question answer at the end.
| High-frequency questions | One-sentence answer |
|---|
| Should I use PA66 or PA6 for the blades? | For high durability, choose the PA66 system, and for cost models, PA6 modification |
| Does the chassis need to be rust-proof? | Plastic chassis does not rust, but must resist creep and weather resistance . |
| Will the mesh cover rust? | Plastic mesh cover is not rusty, with dual indicators of rigidity and weather resistance . |
| How long does aging take? | Xenon lamp starts from 2,000 hours, coastal models use humidified heat. |
Adding a detail about dynamic balance: After replacing the blade material, even if the dimensions remain the same, the modulus and specific gravity of the material change, causing the vibration characteristics of the entire blade to drift. Some factories did not retest dynamic balance after material replacement, and the noise complaints were concentrated in a specific speed range. After two months of tracking, it was discovered that the frequency shift was caused by the material change. Material change is not replacement, but a fresh start of balance verification—this statement is a complete test schedule for outdoor units.
Deeper Layer: On-site knowledge of outdoor unit components
The operating conditions of air conditioning outdoor units are called the 'Three Highs and One Cycle' in the industry: high temperature, high humidity, high UV exposure, plus the large temperature cycle of winter and summer. The fan blades, mesh cover, and chassis are all soaked in this three highs and one cycle, but each has different stress modes and different centers of gravity. The fan blades are rotating parts, worried about frequency shifts and dynamic balance drift caused by modulus decay;
Mesh covers are structural parts, worried about aging and loss of impact toughness; The chassis is a load-bearing component, prone to creep and salt spray. The idea of three things and three remedies, a universal formula that works the world will definitely cause a silent loss on outdoor units.
There is a pattern for blade aging failure: first yellowing, then becoming brittle, and finally breaking at a certain load peak. There is usually a six-month window from yellowing to breakage, which is the window for after-sales accountability and rectification. We recommend that after-sales include blade color as an inspection item. For batches with excessive yellow index, early replacement is much cheaper than compensation and reputational damage after breakage.
Some regional dealers have compared and found that the cost of proactive parts replacement is one-third of passive compensation, a fact widely circulated within after-sales departments.
Chassis creep is the silentest failure among external parts. The vibration from the compressor starts is transmitted to the chassis day after day. The creep of the plastic causes the support surface to slowly deform, manifesting as the outdoor unit gradually tilting, increased copper tube stress, and finally weld joint fatigue cracking.
Creep testing should be accelerated based on a ten-year lifespan. Materials with poor data cannot be restored by thickening because creep is related to stress levels; thickening and reducing stress is the correct solution. Design margin for chassis parts: better to have more than too small.
Salt spray is a hidden hurdle for coastal projects. The plastic itself is not rusty, but the metal inserts and fasteners on plastic parts will rust, and the expansion force of the corrosion causes the plastic to crack. This failure mode is called insert expansion cracking, which is common in aftermarket parts from coastal areas. The solution is to select stainless steel inserts or use coatings, and perform joint testing of insert pull-out and salt spray on the plastic side.
The boundary between plastic and metal is always the most prone to problems—this applies to outdoor parts and all structural components.
The installation height of outdoor units also brings a little-known fact: the wind load on upper floors is much greater than on the ground, and on windy days, outdoor units also vibrate more frequently, reducing the fatigue life of plastic parts on higher floors. If the same batch of outdoor units is installed on the thirtieth floor versus on the first floor, the after-sales rate of plastic parts can be quite different.
Regional material solutions sound luxurious, but if you add floor factors to the operating schedule, you only need to add one more level to the procurement specifications, and the cost is almost zero.
The lesson from the assembly side is also worth remembering: outdoor units' plastic parts use self-tapping screws, and excessive torque causes the plastic base to slip. The slipped wire base slowly loosens during wind vibration, and you only notice when the part falls off.
Torque Driver is the basic configuration of outdoor unit assembly lines. The torque limit for plastic parts is printed on the first page of the work manual. This few yuan investment means you can get dozens of yuan in compensation and hundreds in on-site costs.
Safety parts like mesh covers also have regulatory requirements: the gaps and strength of protective nets have standard requirements. Strength verification of plastic mesh covers must be done according to standards, not just tactile feel. Some customers' plastic mesh covers failed to meet strength standards in third-party inspections, leading to whole batch returns and material changes, with the lost batch using cost-cutting materials with insufficient glass fiber content.
The saying "You can't skimp on safety parts" has been tested too many times in outdoor unit projects.
To wrap up, here's a selection philosophy: For external components, it's best to sort by 'who broke first' rather than 'who is more expensive.' Blade weathering, chassis creep, and grille toughness all age at different rates. Spending money on the parts that age first results in the smoothest after-sales curve for the whole machine.
This sorting method has been used in projects at two OEMs, and the after-sales cost calculation results in a 20% lower cost than the average-based material plan. Material budget isn't about cutting the cake—it's about sequential.
Outdoor parts also have a seasonal account to calculate: summer electricity peaks and winter frosting make the temperature cycle of the outdoor unit more frequent than the climate itself. For models with defrosting once an hour, plastic parts experience dozens of cycles of hot and cold per day, which is an order of magnitude denser than the natural cycles in temperate climates.
The number of cycles in the verification plan should be calculated according to the machine's own program rhythm, not by climate. This is the fundamental difference in verification thinking between outdoor and outdoor structural parts. One year, one export model conducted cycle verification based on the target market's climate, but after importing to another frost-prone area, the failure rate rose. The review concluded that the cycle count was miscalculated based on the baseline.
Operating conditions follow the program, not the map. Remembering this can help avoid a whole range of verification accidents.
Conclusion
The air conditioner outdoor unit fan is made of PA66-GF30 with a UV formulation and is considered the 'standard operating condition.' Don’t use PA6; it won’t last 10 years outdoors. Also, don’t just look at the UV formulation without considering the carbon black content. True aging resistance requires a combination of 'carbon black + UV stabilizer.'
For the fan/base you have, the outdoor exposure lifespan and rotational speed are the two parameters that determine the general direction.
For over a decade, I’ve focused on just one thing: modifying nylon to make it usable.
We can also discuss material selection for long-term use in home appliance outdoor components.
