产品介绍

A型PTFE油封是由PTFE+碳纤材质制作而成，具有很好的耐磨耐高温以及耐水性，产品性能稳定、使用寿命长，因为有PTFE全铁氟龙单密封唇的处理，使其摩擦助力小.

东晟密封提供密封系统解决方案及产品设计服务

产品特点

构槽简单，尺寸稳定性好

THE GROOVE IS SIMPLE AND THE DIMENSION IS STABLE

A型PTFE油封，耐高温、耐水、耐磨无粘滞现象，在有润滑和无润滑时性能都很好。

《产品实拍》

产品优势

• 01减少机械故障REDUCE MECHANICAL FAILURE

  使用合适的广州东晟密封油封密封件，能让您减少工程机械设备的故障几率，能保证生产效率，让机械使用寿命更长久。

  

• 02油封性能优良EXCELLENT PERFORMANCE

  专注研发油封、油封修理包及油封散件，免费为客户根据需求工况设计密封方案，将其发挥密封性能，符合工作环境的需求.

  

应用行业

A型PTFE油封产品应用行业

A型PTFE油封

PTFE ROTARY SHAFT SEAL · TYPE A

耐温范围宽，-60℃~+260℃长期稳定

WIDE TEMPERATURE RANGE, STABLE FROM -60℃ TO +260℃

化学惰性强，几乎耐所有工业介质

HIGH CHEMICAL INERTNESS, RESISTS ALMOST ALL INDUSTRIAL MEDIA

摩擦系数低，无油膜也可干运转

LOW FRICTION COEFFICIENT, CAPABLE OF DRY RUNNING WITHOUT OIL FILM

A型PTFE油封，以聚四氟乙烯唇口搭配金属或橡胶外骨架，应用于盾构机Shield Machine、施工工程Construction Engineering、污水处理Sewage Treatment、汽车发动机Automobile Engine、机器人行业Robot Industry、智能制造行业Intelligent Manufacturing Industry。

PTFE Rotary Shaft Seal Type A, with a PTFE lip combined with a metal or rubber outer case, applied in Shield Machine, Construction Engineering, Sewage Treatment, Automobile Engine, Robot Industry and Intelligent Manufacturing Industry.

盾构机 Shield Machine

盾构机主驱动减速机、螺旋输送机轴端与铰接装置轴颈长期工作在膨润土泥浆、泡沫剂、同步注浆浆料混合的介质中，普通丁腈橡胶油封在碱性泥浆与化学添加剂长期浸泡下会溶胀、硬化，唇口失去弹性。聚四氟乙烯几乎不被酸碱与有机溶剂侵蚀，A型PTFE油封的唇口在这类复合介质中能保持尺寸与硬度不变。A型PTFE油封适用于盾构机低速大直径的回转部位——刀盘主轴承外侧密封、螺旋机尾端轴封，转速通常在每分钟数转至数十转，线速度低但介质污染严重，PTFE唇口无需依赖油膜即可维持贴合，避免了泥浆稀释润滑脂后出现的干摩擦烧唇。

Main drive reducers, screw conveyor shaft ends and articulation journals of shield machines work long-term in media mixed with bentonite slurry, foam agent and simultaneous grouting mortar. Conventional NBR seals swell and harden under prolonged immersion in alkaline slurry and chemical additives, losing lip elasticity. Polytetrafluoroethylene is virtually immune to acid, alkali and organic solvents, so the A-type PTFE seal lip maintains its dimensions and hardness in such composite media. The A-type PTFE seal suits the low-speed, large-diameter rotating parts of shield machines — outer seals of the cutterhead main bearing and tail-end shaft seals of screw conveyors, typically running from a few to several tens of revolutions per minute. Linear speed is low but media contamination is severe; the PTFE lip maintains contact without relying on an oil film, avoiding dry-friction lip burn after slurry dilutes the grease.

施工工程 Construction Engineering

压路机振动轴、摊铺机振捣轴与沥青搅拌设备轴端是施工机械中对温度最敏感的部位。沥青摊铺与搅拌工况下，轴端环境温度常年在150℃~200℃区间，普通丁腈橡胶油封的长期耐温上限约100℃，在这类部位通常数周即硬化开裂。聚四氟乙烯长期使用温度可达260℃，A型PTFE油封的唇口在沥青高温环境中不软化、不碳化，密封面保持稳定。同时施工场地粉尘浓度高，PTFE摩擦系数约为橡胶的三分之一，唇口摩擦发热更少，配合耐磨填充改性后可在粉尘介质中长时间维持贴合，减少振动轴因密封失效导致的漏油停机。

Vibration shafts of rollers, tamping shafts of pavers and shaft ends of asphalt mixing plants are the most temperature-sensitive points in construction machinery. Under asphalt paving and mixing conditions, shaft-end ambient temperature stays in the 150℃~200℃ range year-round, while conventional NBR seals have a long-term temperature limit of about 100℃ — at such points they harden and crack within weeks. PTFE offers long-term service up to 260℃; the A-type PTFE seal lip neither softens nor carbonizes in hot asphalt environments, keeping the sealing surface stable. Construction sites also have high dust concentration, and PTFE's friction coefficient is roughly one third that of rubber, generating less frictional heat at the lip. Combined with wear-resistant filler modification, it maintains contact in dusty media for long periods, reducing oil-leak downtime caused by seal failure on vibration shafts.

污水处理 Sewage Treatment

污水处理厂的曝气机、刮泥机、污泥搅拌器与水泵轴端长期处在潮湿、含硫化氢与酸碱腐蚀性介质的环境中，普通橡胶油封在长期接触污水后易发生溶胀与微生物侵蚀，密封面逐渐失效并向轴承腔渗水。聚四氟乙烯的吸水率接近于零，且耐酸碱与耐化学腐蚀，A型PTFE油封在污水介质中长期使用不会溶胀变形。这类设备多为低速大直径轴系，PTFE唇口启动力矩低，可减轻刮泥机在低速运行时出现的爬行与抖动，配合金属外骨架的整体刚性与沟槽的稳定压紧，适合污水池上方潮湿环境下的长期连续运转。

Blower, sludge scraper, sludge mixer and pump shaft ends in sewage treatment plants operate long-term in humid environments containing hydrogen sulfide and acid-alkali corrosive media. Conventional rubber seals swell and suffer microbial attack after prolonged sewage exposure, gradually failing and allowing water to seep into the bearing chamber. PTFE has an almost zero water absorption rate and resists acid, alkali and chemical corrosion; the A-type PTFE seal does not swell or deform during long service in sewage media. Such equipment mostly uses low-speed large-diameter shafts, and the PTFE lip has a low breakaway torque, reducing stick-slip and vibration of sludge scrapers at low speed. Together with the structural rigidity of the metal outer case and stable groove compression, it suits continuous long-term operation in the humid environment above sewage tanks.

汽车发动机 Automobile Engine

发动机曲轴前后油封、凸轮轴油封与涡轮增压器轴封是汽车动力总成中转速与温度负荷最高的旋转密封部位。曲轴在高速运转时轴颈线速度可达每秒十米以上，普通橡胶唇口在高线速度下摩擦热累积，唇口易老化变硬。聚四氟乙烯摩擦系数低、自润滑性强，A型PTFE油封在高速旋转时摩擦温升明显低于橡胶唇口。涡轮增压器轴端工作温度可达200℃以上，且转速极高、供油条件苛刻，PTFE油封的耐高温与干运转能力正是这一部位的主流选择。同时PTFE唇口对发动机油中的添加剂与燃烧副产物不敏感，长期使用后唇口尺寸稳定，有利于维持曲轴箱的密封与排放合规。

Crankshaft front and rear seals, camshaft seals and turbocharger shaft seals are the rotary sealing points with the highest speed and temperature load in automotive powertrains. At high engine speed, crankshaft journal linear velocity can exceed ten meters per second; conventional rubber lips accumulate frictional heat at such speeds and age into hardening. PTFE has a low friction coefficient and strong self-lubricity, so the A-type PTFE seal generates noticeably less friction heat than a rubber lip during high-speed rotation. Turbocharger shaft ends can reach operating temperatures above 200℃ with extremely high speed and demanding oil supply conditions — the heat resistance and dry-running capability of PTFE seals make them the mainstream choice here. The PTFE lip is also insensitive to additives and combustion by-products in engine oil, keeping lip dimensions stable over long service and helping maintain crankcase sealing and emission compliance.

机器人行业 Robot Industry

工业机器人关节中的RV减速机与谐波减速机输出轴、腕部回转轴需要密封件在频繁正反转、微动与低速重载条件下保持稳定。这类关节的启动力矩直接关系到机器人的定位精度与重复精度，橡胶唇口在长时间静止后启动时容易出现粘滑爬行，造成微小位置偏差。聚四氟乙烯静摩擦系数与动摩擦系数接近，A型PTFE油封在低速启动时不产生粘滑，有助于保持关节运动的平顺性。同时机器人关节内部润滑脂长期不更换，PTFE对润滑脂中的极压添加剂与老化产物耐受力强，唇口不易被侵蚀变软，可在数年维护周期内维持密封与低摩擦特性，减少关节漏脂与重复定位精度衰减。

Output shafts and wrist rotation axes of RV reducers and harmonic reducers in industrial robot joints require seals to remain stable under frequent reversals, micro-motion and low-speed heavy loads. The breakaway torque of such joints directly affects robot positioning and repeatability accuracy; rubber lips tend to exhibit stick-slip on startup after long idle periods, causing small positional deviations. PTFE's static and dynamic friction coefficients are close, so the A-type PTFE seal produces no stick-slip at low-speed startup, helping maintain smooth joint motion. Robot joint grease is rarely replaced over long periods; PTFE strongly resists EP additives and aged products in the grease, so the lip is not easily attacked or softened and can maintain sealing and low friction over multi-year maintenance intervals, reducing grease leakage and repeatability degradation.

智能制造行业 Intelligent Manufacturing Industry

智能制造产线上的伺服电机轴端、精密主轴、直线导轨滑块与自动化装配单元追求高节拍、高精度与低维护，密封件不允许因摩擦发热导致温升漂移影响定位，也不允许油脂外溢污染工件与洁净环境。聚四氟乙烯唇口摩擦力矩小，A型PTFE油封在高速主轴与伺服轴系中摩擦温升低，有利于维持设备的热稳定性。PTFE本身不含增塑剂，长期运行不会析出油污或掉屑，适合洁净车间与电子、半导体、精密装配等对洁净度敏感的场景。在微量润滑甚至干运转的工况下，PTFE的自润滑特性使其仍能维持密封，避免因润滑中断而出现唇口烧伤与突发漏油。

Servo motor shaft ends, precision spindles, linear guide sliders and automated assembly units on intelligent manufacturing lines demand high cycle rates, high precision and low maintenance; seals must not cause temperature drift that affects positioning through frictional heat, nor allow grease to escape and contaminate workpieces or clean environments. The PTFE lip has a low friction torque, and the A-type PTFE seal generates little frictional temperature rise in high-speed spindle and servo shaft systems, helping maintain thermal stability of equipment. PTFE itself contains no plasticizers, so it does not bleed oil or shed particles over long operation — suitable for clean rooms and cleanliness-sensitive scenarios such as electronics, semiconductors and precision assembly. Under micro-lubrication or even dry running, PTFE's self-lubricating nature still maintains sealing, preventing lip burn and sudden leakage when lubrication is interrupted.

线速度≤20m/s，压力≤0.05MPa，温度-60~+260℃

LINEAR SPEED ≤20M/S, PRESSURE ≤0.05MPA, TEMPERATURE -60~+260℃

A型PTFE油封使用场景为：盾构机 Shield Machine、施工工程 Construction Engineering、污水处理 Sewage Treatment、汽车发动机 Automobile Engine、机器人行业 Robot Industry、智能制造行业 Intelligent Manufacturing Industry

Application Scenarios for PTFE Rotary Shaft Seal Type A: Shield Machine, Construction Engineering, Sewage Treatment, Automobile Engine, Robot Industry, Intelligent Manufacturing Industry

广州东晟油封厂家

GUANGZHOU DONGSHENG OIL SEAL MANUFACTURER

dshseals.cn

集研发、生产、销售于一体的国家高新技术油封厂家 · 235种材料配方 · 1725种选型方案

National High-Tech Enterprise integrating R&D, Production and Sales · 235 Material Formulations · 1725 Selection Solutions

使用说明

A型PTFE油封 使用说明

PTFE ROTARY SHAFT SEAL TYPE A · INSTALLATION & MAINTENANCE GUIDE

结构与材质 Structure & Material

A型PTFE油封由聚四氟乙烯（PTFE）唇口与金属外骨架组合而成，唇口通常为车削或模压成型后经机械加工修整刃口，与橡胶唇形油封不同，PTFE唇口本身几乎没有高弹性回复，密封力来自唇口的过盈预紧与介质压力作用。纯PTFE存在冷流变（长期受压缓慢变形）倾向，实际产品一般通过碳纤维、玻璃纤维、石墨或青铜粉填充改性来提升抗压变性与耐磨性，因此不同厂家的填料体系不同，性能表现也存在差异，不能仅凭“全PTFE”三个字直接替换。

PTFE Rotary Shaft Seal Type A consists of a polytetrafluoroethylene (PTFE) lip combined with a metal outer case. The lip is usually machined or molded and then precision-trimmed at the sealing edge. Unlike rubber lip seals, a PTFE lip has almost no high elastic recovery; sealing force comes from interference preload and media pressure. Pure PTFE tends to cold flow (slow deformation under sustained load), so production parts are generally modified with carbon fiber, glass fiber, graphite or bronze filler to improve creep resistance and wear resistance. Because filler systems differ between manufacturers, performance differs too — a seal cannot be replaced simply on the grounds that it is "all PTFE".

安装要点 Installation Key Points

① 安装方向：唇口刃口必须朝向被密封介质一侧，A型多为单向密封；双向工况须选用双向唇口结构，装反会导致介质直接推开唇口泄漏。
② 禁止撑开唇口：PTFE唇口不具备橡胶的弹性，安装时严禁用工具撑开或拉伸，唇口一旦出现塑性变形即无法恢复，只能报废。
③ 轴面要求：轴表面粗糙度控制在Ra 0.2~0.4μm，轴端必须有15°~20°倒角并倒圆，不得有毛刺、键槽锐边、螺纹、镀层剥落；唇口翻越键槽或台阶时必须使用安装护套。
④ 安装工具：使用专用压装套筒均匀施压，压力作用在外骨架端面而非唇口，禁止锤击或单边敲入，避免骨架变形导致唇口偏心。
⑤ 同轴度：PTFE唇口跟随能力弱于橡胶，安装后须确认轴与孔的同轴度与径向跳动在设备要求范围内，跳动过大会造成唇口单侧偏磨。
⑥ 润滑：安装前在唇口刃口与轴面涂少量清洁的介质油，既便于压装，也避免首次启动时出现干摩擦温升。

① Installation Direction: The lip edge must face the sealed media side. Type A is mostly single-acting; use a double-lip design for bidirectional duty. Reversed installation lets media push the lip open and leak.
② Never Spread the Lip: A PTFE lip lacks rubber-like elasticity; never spread or stretch it with tools during installation. Once plastically deformed, the lip cannot recover and must be scrapped.
③ Shaft Requirements: Control shaft surface roughness at Ra 0.2~0.4μm. The shaft end must have a 15°~20° chamfer with a rounded edge and no burrs, sharp keyway edges, threads or coating spalling. Use an installation sleeve whenever the lip must pass a keyway or step.
④ Installation Tooling: Press evenly with a dedicated installation sleeve; force must act on the outer case face, not the lip. Never hammer or press in on one side — case distortion causes lip eccentricity.
⑤ Coaxiality: PTFE lip follows shaft movement less well than rubber. After installation, verify shaft-to-bore coaxiality and radial runout are within equipment limits; excessive runout causes one-sided lip wear.
⑥ Lubrication: Before installation, apply a small amount of clean media oil to the lip edge and shaft to ease pressing and avoid dry-friction temperature rise at first startup.

工况参数 Operating Parameters

线速度：≤20 m/s（超过后唇口摩擦热显著上升，需评估轴表面散热条件）
压力：≤0.05 MPa（A型油封为低压旋转密封，不承受液压系统工作压力）
温度范围：-60℃ ~ +260℃（接近上限长期运行会加速PTFE氧化与填料老化）
适配介质：矿物油、合成油、水、酸碱溶液、有机溶剂、食品级介质（PTFE化学惰性强）
不推荐工况：含高硬度磨粒的浆料、轴跳动超差的轴系、需承受工作压力的高压腔体

Linear Speed: ≤20 m/s (friction heat rises sharply beyond this; assess shaft heat dissipation)
Pressure: ≤0.05 MPa (Type A is a low-pressure rotary seal and does not withstand hydraulic working pressure)
Temperature Range: -60℃ ~ +260℃ (long-term operation near the upper limit accelerates PTFE oxidation and filler aging)
Compatible Media: Mineral oils, synthetic oils, water, acid and alkali solutions, organic solvents, food-grade media (PTFE is chemically inert)
Not Recommended: Slurries with hard abrasive particles, shafts with excessive runout, high-pressure chambers requiring working-pressure capability

维护周期 & 失效排查 Maintenance Schedule & Failure Diagnosis

维护周期：
· 常规工况（清洁介质、温度平稳）：12个月检查一次
· 严苛工况（高温、腐蚀介质、粉尘）：6个月检查一次
· 检查内容：唇口刃口是否有磨损台阶、裂纹、碳化变色；轴面是否有轴向划痕；轴跳动是否超差；外骨架是否松动

常见失效与排查：
· 唇口装反 → 介质直接推开唇口泄漏，按介质侧方向重装
· 唇口被撑开变形 → 安装时用工具撬入，PTFE无法回复，整件更换并使用压装套筒
· 单侧偏磨 → 轴跳动或同轴度超差，校正轴系后更换油封
· 唇口冷流变形 → 长期高压或选用未填充PTFE，改用填充改性牌号
· 唇口碳化变色 → 长期超温运行，核算实际接触温度并降低工况
· 轴面被磨出台阶 → 轴粗糙度超差或唇口含硬质填料，修磨轴面至Ra 0.2~0.4μm

Maintenance Schedule:
· Normal Duty (clean media, stable temperature): Inspect every 12 months
· Severe Duty (high temperature, corrosive media, dust): Inspect every 6 months
· Inspection Items: Lip edge wear step, cracks, carbonized discoloration; axial shaft scoring; shaft runout out of tolerance; loose outer case

Common Failures & Diagnosis:
· Reversed Installation → Media pushes the lip open and leaks. Reinstall facing the media side.
· Lip Spread and Deformed → Pried in with tools during installation; PTFE cannot recover. Replace the whole seal and use a press sleeve.
· One-Sided Wear → Shaft runout or coaxiality out of tolerance. Correct the shaft system, then replace the seal.
· Lip Cold Flow Deformation → Sustained high pressure or unfilled PTFE. Switch to a filled modified grade.
· Lip Carbonized and Discolored → Long-term over-temperature operation. Verify actual contact temperature and reduce duty.
· Step Worn into Shaft → Roughness out of tolerance or hard filler in the lip. Regrind shaft to Ra 0.2~0.4μm.

A型PTFE油封适用行业：盾构机 Shield Machine、施工工程 Construction Engineering、污水处理 Sewage Treatment、汽车发动机 Automobile Engine、机器人行业 Robot Industry、智能制造行业 Intelligent Manufacturing Industry

广州东晟油封厂家

GUANGZHOU DONGSHENG OIL SEAL MANUFACTURER

dshseals.cn

集研发、生产、销售于一体的国家高新技术油封厂家 · 235种材料配方 · 1725种选型方案

National High-Tech Enterprise integrating R&D, Production and Sales · 235 Material Formulations · 1725 Selection Solutions