密封結(jié)構(gòu)設(shè)計(jì).

1、O型圈密封結(jié)構(gòu)設(shè)計(jì)Jom n Ccnrrolt I Janiaiy 2009Li Qiang 2011-01-07Johnson 姒' Controlssb密封結(jié)構(gòu)設(shè)計(jì)Jom n Ccnrrolt I Janiaiy 2009Jom n Ccnrrolt I Janiaiy 20091、2、3、4、5、6、7、8、9.0型圈概述0型圈密封原理和要求0型圈材料特性及選擇0型圈密封的設(shè)計(jì)原則0型圈密封溝槽設(shè)計(jì)0型圈的性能0型圈失效0型圈的變形發(fā)展0型圈生產(chǎn)制造 10問題1.0 O型匕 Ao型IB是一種界面形狀為圖形的樟膠圈.是液壓氣動(dòng)中應(yīng)用最廣泛的密封件1.1 o 型特點(diǎn)匕 ABefore

2、 InstallationWith System PressureAfter Installation特點(diǎn)i1尺寸小裝拆方便2動(dòng)靜可用39MB封幾乎沒有泄SB4型件使用雙向密封5動(dòng)擦力小6價(jià)格低Jom n Ccnrrolt I Janiaiy 2009Jom n Ccnrrolt I Janiaiy 20092. 1 0 型密封原理O-Ring glandFI0 M0型圄密封是一種擠壓型密封.當(dāng)密封件產(chǎn)生初始形變和應(yīng)力Ptea|t P?Pz時(shí).將不會(huì)林 P.=P0H>pt P聲XP P.=P°4KXPK為介質(zhì)壓力待逐給0型BE壓力的系效（對(duì)1膠.K=1,對(duì)無經(jīng)鍋管？復(fù)合巒封88

3、?）因此，只KO£H在初始?jí)毫?就可實(shí)現(xiàn)無泄的絕對(duì)鈿 >（）型詔密封是一種自密封結(jié)構(gòu)。2. 1 0 型密封原理2. 1 0 型密封原理理論±Off«也可實(shí)現(xiàn)密封.實(shí)際是不可能的倦心工作載荷下.0型RB拉伸.變細(xì).就可純泄漏低湛4&膠收縮.變?nèi)?可能泄涮（低逅會(huì)遺成權(quán)膠加速老化失去補(bǔ)償能力）一般斷面有7%-30%的壓縮變形率，靜密封取大的壓縮率_05"30。_亠動(dòng)花封取小的壓縮率（9-25®2. 1 0 型密封原理2. 1 0 型密封原理Jom o Controlt I Janiary 20C2.3 0型圈受內(nèi)壓、外壓選擇受內(nèi)壓受內(nèi)

4、壓0型圄外徑與溝權(quán)外徑相同受外壓OSRE內(nèi)徑與溝權(quán)內(nèi)徑相間防止出現(xiàn)左至作壓力下出現(xiàn)畫1直徑變小將0形露安裝在溝權(quán)內(nèi)時(shí).要受到拉伸或壓&若拉伸和壓縮的數(shù)值過大.將導(dǎo)致0形韶載面過度増大或 減小.因?yàn)槔?%相應(yīng)地使戯而乏徑*減小約0 5%.對(duì)于孔用（內(nèi)壓0形BEAL好處于拉伸狀態(tài).最大允許拉伸為6如對(duì)于軸用（內(nèi)壓密封，0形圈艮好延只周長方向受壓縮.最大允許周長壓縮為3,Jctkf Ccnvrolt I Jania/y 30WC )trolJanuary 2009C )trolJanuary 20092.4 0型擠出原理C )trolJanuary 2009O-Ring Life Cycl

5、e1 Installation of O-Ring2. Pressure Applied to O-Ring (Ideal)3. Extrusion of O-Ring4. Failure of O-RingC )trolJanuary 20092.4 0型圈允許擠岀間隙量大允許擠出問隙tmax和系統(tǒng) 壓力.0老圈截面直徑以及材料理 度初關(guān)通常.工作壓力* 大允許擠出間Mtcrmix取值越小.如 果何RU亀過允許范BL就會(huì)昌致0 形90橋出甚至損壞.出壓力超過5MPa 時(shí).建議使用羥圈(C)fiE力掙用村壓力VPaHRHMlhlftPT1-82. 61X0327. 00氏 IMAT0xso0.

6、080.05<7.000.050.070.090.090.1010.500.030.010.05ao?0.08卸氏怯農(nóng)人80£3.505a is0. 20WT 000.080.09a ioa 130.15-.10. 500.05o. or0.080.090.10WH.CO0.030.01a. osa 07o. oe<n. so0.020. 02a os0.030.01鼻氏氓叱A90W3.500.130.15a. 20a 230. 25<7. 0050.180.20=510.500.070.090.1

7、0a 130.150.050. 070.080.090.1091：. 500.010.050.070.080. OFs.co0.030.010.050.070. 08c7 35. (00.020.030.03a w0. 012.4 0型圈允許擠岀間隙Control*2.4 0型圈允許擠出間隙2.4 0型圈允許擠岀間隙2.4 0型圈允許擠岀間隙10 I2. 5 0型圈壓縮量選擇和材料有關(guān)的曉圏QB周方向的壓縮力2. 5 0型圈壓縮量選擇2. 5 0型圈壓縮量選擇3. 0 0型圈材料特性特長眾氨BS檢膠優(yōu)!M但刪化學(xué)芮品性較逢。另外.&膛的檔許ISB)廣TRttKNBR；IWJB性、iW油

8、性優(yōu)!！且價(jià) 由干Mttti不隹.應(yīng)避免左pa光衛(wèi)射的場(chǎng)所.或產(chǎn)生鹽爼的電n Ksmittt 用.、KTKHK(CR)整體性能平俱.且價(jià)櫓便直C乙丙It膠(EPDM)*1復(fù)性優(yōu)健且價(jià)格便直 耐®性.#1«!性»»<.異丁權(quán)膠(IIR)ATMMtl.氣專性憂*可聘丁克7輪抽的內(nèi)等“ MMtt.(FPM)備騎性鼻均優(yōu)良，3 膠 <SI)對(duì)焦性優(yōu)良，(2機(jī)K翌段較差、且價(jià)格偲；hanenight®)沖sea性優(yōu)良。為熱性、刑瘴性及場(chǎng)油性較連°2. 5 0型圈壓縮量選擇2. 5 0型圈壓縮量選擇12 1C<otrt>l

9、« I Jiniary 20W3. 1 0 型材料特性比較14 1.itroK I Janjarv 20093. 1 0 型材料特性比較14 1.itroK I Janjarv 20093. 1 0 型材料特性比較特性比較圖腫丁«(NBR)(CR)乙丙購(EPDM)異丁1*砂5只)an (fpm)由IBHSO"t13 ontrolt I jeruary MW14 1.itroK I Janjarv 20093. 1 0 型材料特性比較14 1.itroK I Janjarv 20093. 1 0 型材料特性比較3. 2 0型圈材料特性排序特性排序14 1.itro

10、K I Janjarv 20093. 1 0 型材料特性比較低鼻性橡膠聚氨酷橡膠乙丙橡膠僅彈性鏢膠異丁橡膠低彈性橡膠乙丙橡膠異丁橡膠乙丙橡膠丁購橡膠氯丁徐膠丁睛橡膠異丁橡膠氯丁橡膠異丁橡膠硅梅膠聚氨菌橡膠氯丁橡膠乙丙橡膠丁睛橡膠硅橡膠低彈性權(quán)膠硅橡膠乙丙橡膠氯丁椽膠丁聲橡膠聚氨禹橡膠橡膠氟橡膠氟橡膠氛橡膠14 1.itroK I Janjarv 20093. 3 0型材料硬度 A聚氨酯橡膠的肖氏硬度標(biāo)準(zhǔn)硬度標(biāo)準(zhǔn)肖氏A95rJ3E：肖 fcA90肖 RA70«A50肖氏A30目行車內(nèi)帶硬度的容許范麗：記戟數(shù)值的土5。凝膠的硬度表示用AskorC和針入度來表示。AskorC和在聚氨Si橡

11、膠的硬度表示中所使用的肖氏A硬度的 關(guān)系，大致如下圖所示。(oKA)I I I I I I I I IASKER C24 30 K)50SO7)KI90sris oioi c型n iiirtie-JIS K2207巳將針入度標(biāo)冷化，使規(guī)定晝it的針霆直進(jìn)入域件中， 入的長廈來*示試件筲枝度。針入度的值為1/IOmmM.對(duì)應(yīng)針入廈為1。(散值越大砌材陌越承墳。)因 此同肖氏磧度或ASKER的希對(duì)叱較較力圉機(jī) 故沒有PJfitt較衣。3. 3 0型材料硬度 A3. 3 0型材料硬度 AI Jeruarv 20W3.4 0型材料特性特性值】負(fù)口tiwuv比R一1.131.131201 161 201

12、.C31.02”氏A95907050307015MPa44 14631 327 418511 R06%畑530650690GOO250445r/O/O707070/080c-40-20-23-20-2C-20-40第杭抽廈理伽事的各桔哼伯幅wmis機(jī)tK(psiat行試購?？估露菳建性 用磨性Bt 水定聚氨商乙釀?lì)惡愄匦员容^ 粗1帥時(shí)汰(SC»O特性值*«5)® 損 沖価頁MttTmm®rarm莎王hesih】ewpt<E8悝冷肢O1.61.3：.61.2151 21.31.2獨(dú)氏a705065050680GO705050

13、5732MPa1274413 31287512510.B7.488788310 3370400460490380330270300330400810640>8«JHaKC909910020120:HO23020020020060IZ：連ta«e耳2度30808C808C210210150150150303CM9M£TO10354030TOTO-707C一 501010iwat性.科畝鼻常泊站IW久性3.5 0型材料耐化學(xué)性耐化學(xué)藥品性比較聚氨確權(quán)膠丁肪檢膠氯丁檜膠乙丙嫌膠異丁橡膠|軌檢膠|硅檢膠|低彈性橡膠汽油© 1OXXO水O | OO1 O |

14、O遲酸XOOOOitXOO| OOXOO乙醍1X |X-A><-OO*_4x-厶XXX-OOXOX=tt. 0=良、=可.x=不可C*>ntrol< I Jenuory 20093. 6 0型材料耐溫性 1 能H 度比較HJi.»»a<cc>丁 =KT«JK極丁從MES J0HWOI CcnwoB >20093.7 0型材料選擇原則外界因素;1. 工作狀乞：動(dòng)審封.靜密封；連it工作.間斷工作等2. 工作介質(zhì)，液體、氣體還是兩相潦.及介質(zhì)的物理化學(xué)性能.與介廣相容性 j.工作壓力，介廣工作壓力高低.壓力波帳駅時(shí)最大壓力4.

15、工作溫度：瞬時(shí)溫度和冷熱交變週度5.成本來ifh成本低.來源廣3.7 0型材料選擇原則3.7 0型材料選擇原則0型詔的復(fù)度仗度，一般為70«90邵氏應(yīng)度，靜砂選低值70.取高值80.級(jí)少采用90.liceiMfL OfficeIT, 073003 St3.7 0型材料選擇原則3.7 0型材料選擇原則3.7 0型材料選擇原則3.7 0型材料選擇原則H A4. 0 0 型設(shè)計(jì)原則3.7 0型材料選擇原則通則；0型韶?封煨擠壓式密封.設(shè)計(jì)主要內(nèi)容為Offll®的壓縮和拉伸 0型圈査徑壓縮和拉伸叭壓編過小I泄3Bb.壓縮過大工應(yīng)力松號(hào)引起泄漏ct拉伸過大界面直徑淹少太大而引起泄J8

16、4 0壓縮率設(shè)計(jì)bW%=(d04i)/dooav有足夠的密封接加面積b9避免永久變形6摩按力盡小圓柱靜密封：10V15%.平面靜更封：15*30%往復(fù)遠(yuǎn)動(dòng)密封I 10%-15%.徒轉(zhuǎn)動(dòng)密封 < 內(nèi)徑比軸大31%.外徑壓編寧為38%圖44 O形密封圈的安裝a) 在外址的矩他槽內(nèi)b) 在內(nèi)展的姬形內(nèi)低掠用«»：-般為5V8%,考應(yīng)介質(zhì)和度引起的腭般. 如超過15%. K9riS材b'|-'八5. 0 0型圈溝槽設(shè)計(jì)4. 1 0 型設(shè)計(jì)原則045. 0 0型圈溝槽設(shè)計(jì)045. 0 0型圈溝槽設(shè)計(jì)4.1拉伸睪設(shè)計(jì)sw%=(<vm)/(4處).ofi皺入輸

17、中后，Tft#有拉如黒無撿侔 裳配時(shí)容9脫出.如拉伸過大.會(huì)導(dǎo)數(shù)超團(tuán)截面 積減少太多.出現(xiàn)泄!一般其拉伸為1V5%>4. 2 0型設(shè)計(jì)原則表4 2 O形壓編于與校伸的選取范3至封介廈竝押a (%>壓細(xì)JI 5 (%>浪佳油、空氣I.OJ-I (M<10115-2515-251対C橫H袖、空代1A2<1.0112-1?12-17Okie09S75-104 2榷篦寬席設(shè)計(jì),0形入密封溝后.其橫載面產(chǎn)生圧編變形.變形后MXft及 其與定封面的搖皺竟度都和0班的密封性能其值過小龕便密封性受 到影響.Bo0形BH變形后的丸度B。()與啪圈的壓縮睪和截面直経d。有關(guān) .可用下

18、式計(jì)算Bo= (1/(1-W)-0. 6W) do ("取 10%*40%)0形B9與密封面的接購面寬度b (m)也取決于W和d 1b <>b=( 4W*2-H). 34W-K) 31)do ( II取 10%*40%)一般悄況.考虎到壓力脈動(dòng)和抽奧空的需求.Bo應(yīng)接近于欄寬. 對(duì)于氣體介廣的密封，Bo應(yīng)比寬小0.1-0. 2fwm對(duì)于液體介頂?shù)腂o應(yīng)比權(quán)寬小02-0. 5nm.同時(shí)Bo不應(yīng)大于楮寬否»J*ff后可施會(huì)減小?封接越寬度.同 時(shí)減小密封接砂力而導(dǎo)致泄漏.初壓力床動(dòng)腐.寬過大會(huì)昌效0型詔來回依移.出現(xiàn)JBttU權(quán)寬 過小會(huì)導(dǎo)致0釵BB填滿溝權(quán).導(dǎo)數(shù)狙

19、力過大OO5.0 0型展溝設(shè)計(jì)，權(quán)體積比0型詔體積大15炫右設(shè)計(jì)M：形狀.尺寸.糯度，對(duì)于動(dòng)«»9需要計(jì)尊相對(duì)運(yùn)動(dòng)何隙 原具嘰容易加工.尺寸合理.越滾容易保證，拆裝方便釦有壓縮330%的圧縮。b9在介質(zhì)中膨脹.洞升聲脹5. 1 0 型溝槽設(shè)計(jì)人cf太宕虞損.太寬滾動(dòng)損.2a*»a1.廠V啓4q稽JKK1 reZMiAMHi入列孵7弄便剛事型內(nèi)It-7_rTZtttts2丹構(gòu)CcF J 心a艮lt金8M«歡上*4-5 績用O魅密封淘的務(wù)坎軋將魚23 b n.Tftniftr045. 0 0型圈溝槽設(shè)計(jì)5.2 OSR8溝舷設(shè)計(jì)，槽深的設(shè)計(jì)決Jto型BE的設(shè)計(jì)

20、壓縮溝槽深度加上間隙小于O3WB白由狀態(tài)下o型曲的找性 0型RE的壓編由內(nèi)徑壓細(xì)6 *和外徑壓縮6 構(gòu)成6'<6.0型圈安裝時(shí)受壓縮孑 彌時(shí)腔圈有彈跳；常用于靛轉(zhuǎn)密封.$二5V0型HB安裝時(shí)未受壓縮；最為常用.5* > 60型圈安羹時(shí)受拉伸；用于滑動(dòng)密封.如活寒密封.045. 0 0型圈溝槽設(shè)計(jì)045. 0 0型圈溝槽設(shè)計(jì)®4-6 0死約三特狀點(diǎn) 9產(chǎn)1>產(chǎn)£)“)6 *)6«6 * c) A>0 *5 3 0型謂溝槽槽口和IV底圓角設(shè)計(jì)， 槽口圓角I防止0燮H8裝配時(shí)出現(xiàn)削傷和刮傷R=010.2 m 過大.過小會(huì)出現(xiàn)什么情況？（擠

21、出和»1傷）fll/KBl角：防止出現(xiàn)應(yīng)力第中.動(dòng)* R=0.11.0 mm , »:R=d3/2 m t1W I lb !045. 3 0型溝槽設(shè)計(jì)5 4 0型圈溝口和補(bǔ)底圓角設(shè)計(jì)；權(quán)口圓角：防止斶翳裝配時(shí)出現(xiàn)割傷和刮傷.R=0.10.2 ran 過大.過小余出現(xiàn)什么情況？（橋出和割傷）權(quán)底圓角：防止出現(xiàn)應(yīng)力備中.動(dòng)I RRY1.0 rwn .養(yǎng):駁m f 5.5 0型圈溝權(quán)表面粗撤度設(shè)計(jì)，靜應(yīng)封：Ra=6 33 2.動(dòng)密封】Ra=1 6 炭轉(zhuǎn)密封：軸凹橫：FU=0. 4或更小A. 采用什么樣的工藝耒加工溝比較好.Jo¥w«o ControUJohns

22、on Controls5.4 0型溝槽設(shè)計(jì)溝I的粗"過大戒過小會(huì)出理什么冋5. 3 0型溝槽設(shè)計(jì)5. 3 0型溝槽設(shè)計(jì)5 6 0型圈捋BS設(shè)計(jì)；目的：防止OffiBST作時(shí)出現(xiàn)間隙咬傷和擠出實(shí)效 使用，單向受壓.一個(gè)擋fffl；雙向受壓.兩個(gè)擋8B.n»4-a不便用卅的大允許同HI<*r mm>0 KHIf < (Hb)出力2QS3S71703103-HS4 G5i0402$(USaioU.<MWOROS050040O7S5. 3 0型溝槽設(shè)計(jì)5. 3 0型溝槽設(shè)計(jì)it代時(shí)莊勺PEII體式憶豪ra乙n，匸仝増3二或缸1»丈m.ogI

23、87;Johnson Controls5.5 0型溝槽設(shè)計(jì)5.7 0型BB溝型式和公養(yǎng)，詳見GB/T 345235.5 0型溝槽設(shè)計(jì)Ccanrolt I Jiruary 20095.5 0型溝槽設(shè)計(jì)5.5 0型溝槽設(shè)計(jì)5.6 0型溝槽設(shè)計(jì)5.5 0型溝槽設(shè)計(jì)5.5 0型溝槽設(shè)計(jì)5.8 0型密封*見型式，&向a?封Thfc M*U.«lhAlL«vmA* »v<rtFitlie WMCJPO "釘 OIOTIR M>snrwMUMXJXDa、rCOa 0»".5<me*nWOI pun rvutoM接頭密封Oa

24、nwcCotnMiWthMMn O«MQ £JUTY«C*.6. 0 0型圈性能WEAR加占r to dlrrirMh gradually by ruction And rubbing motion.Like a pencil eraser, an O-Ring Is being worn away even though vou may not see it until failure306. 0 0型圈性能306. 0 0型圈性能6.1 0型圈性能SEALABILITY306. 0 0型圈性能3ity r. the </4-J Id a r U <

25、. Me “Of "M IExample showing dynamic reciprocating rod密封性能JOYY*01*306. 2 0型圈密封要求STABILITYLtab i *y ii the ity of 3 se«' 8 ne»it el -o,and ihiltinc n 3 eomc.6. 2 0型圈密封要求6. 2 0型圈密封要求31otrolt穩(wěn)定性6. 2 0型圈密封要求6. 2 0型圈密封要求6. 3 0型圈性能EXTRUSION6. 2 0型圈密封要求6. 2 0型圈密封要求32 rotrolt抗擠出性u(píng)arv 2099

26、6. 4 0型圈性能Conformabilityorf jinabUy o tnc ot-litv of o sc» c&pouna to r ix Cam thei”gw x,hat or* .n tho6. 4 0型圈性能6. 4 0型圈性能O-AlRQ WNhoul rrataure站合性WW "eugJohnson Controls7. 0 0型圈失效7.0躍圈失效，o型圈常見的頭效原因有材 科問題、壓純變形.間隙咬傷 .扭曲現(xiàn)次、磨料磨損、表面 粗糙度不當(dāng)和焦耳效應(yīng)尋COMPRESSION SETC壓細(xì)變形.如右圖所示&Description of

27、 failure appearance：lh s failure is co mm or to both static and byname sealing appiicsttons. Ths type of (4i ur« producer HM turMce?. on trw Udx of thu ORir>g that bvumuvuMythe top end bottom if sitt ng floc on o dusxThe sources of COMPRESSION SET failure:The OKing material used has poor ccm

28、pcssion set rcs*s<dfx:c The 0 Ring molerial used has limited wistoncc to heat The O-RIoq is swell ng m the groove due to flukl incompatoMit/ The SRIng loo much squeeze In the grooveHow to elkmlnata COMPRESSION SET failure: Use higher qualtty. low compret<on xt mnz川 Chrrk the compatnr><Ht

29、y 3 the O-Ring material to the fluid Scect a maten.i good for h(Mt produced in operation Ooutsle check the groove dtowncionc for proper cqumm Check existing O-Ririg stock for phscal propertiesJohnson Controls7.1 0型圈失效36Johmvi Controls I Janiary 30097.# 0型圈失效7.1 0型圈失效,0型圈療殞.如右窗所示IJohmvi Controls I Ja

30、niary 3009ABRASIONcription of failure appMmnc0cThis ra« ure <5 mg* Ommor ir dvr-anc sealing appKdCions - l«ke reciprocating anc rotating sh/WtK type or仲“c rcodures o fwuroed surfMr on 叫 side of me 0-R»no body s .jb)«(Hd to【2 movervent.The sources of ABRASION failure The nujlal

31、 surfaces are too ruug' <<i)d are dixasivt- Co the O-Ring The ineul surfdee are too s< ioocK not Alb剛 proper »ub«K：a(>jn Ho lubfk-alkjr in the desiqn (>upr<tiq Irmprintufr » c” tuu ht/i (Of I hr instr tidl The system fluid is contaminated v«th obraseve 吟tide

32、、How to eliminate ABRASION failure: ChaiKje sutfce fir sties I. fet.or inniecd Arrnrgc for bettrr Ijbnrntion Uk a rrotcriol suitable for hqhc，tern pccaUjres EhmmAie any bouccv o< conU»mirwtx>n(Chnnr m 二 more abrio* »*exictart O Rin material36Johmvi Controls I Janiary 30097.# 0型圈失效36J

33、ohmvi Controls I Janiary 30097.2 0型圈失效oaaia安裝損壞.如右圖所示7. 2 0型圈失效INSTALLATIONDescription of failure appearance:n”o .tvri bv：h XdUu orQ <fy«w f k. O P F，ShvH 心U 5o»ped rg on tnc surtace of e O-M>ng can ac rvotced.The fcourcet of TNtTALLATTON failure： The use of scores edeed tools Sharp

34、comers on the O Ring groove $h»-p thred, the OR ng f c over ho load n cnamfer O-Rir>Q 3、not luDrcjtetf O-Rinq was twstefi o- trapped between metfll surfaces rw ZI叫 C< tb< EWrialNow to eliminate INSTALLATION failure: Covo* thr«ad« rtlth mxhirg gp« Rek all narp ooocf Crace

35、 a 15 to 20 decree leed-ir <Mmrer LuuicMv O-Mng dung eSImxhiUse evror? cecd O R nc36Johmvi Controls I Janiary 30097. 3 0型圈失效7.3曲圈失效,EXPLOSIVE DECOMPRESSION失效如右BB所示,Description of failure appearance:You II find random ruptures, crater-Hke pores arvd slits, wh ch ha蟲 originated within the body of t

36、h< O-RirgThA sources of EXPLOSIVE DECOMPRESSION r<lilur: permeating tne O-Rmg rnatena fUipd decnmprt*rlon of those gm、 Miao<M(piosQns occurng as decompr««lon p<aceHow to diminato EXPLOSIVE DECOMPRESSION failure: Slow system cydes dog n IncreaM for d«cmpces$ion Rrptaco w *h

37、 a hark matorial Select .1 smdllar C-Ring cro$ sectionCrwtrolt I Jaruarv 20WJohnson Controls7. 4 0型圈失效7.4 OfflM失效,HEAT HARDENING AND OXIDATION0世8熱損傷和額化.如右圖所示1Description of failuro appearance:You w I moo this hnlum in both static md dyn.i-nic O-Ring<： A flattened area will app<*.>r on th

38、71; dynamic curfaci? Somdim<K crxJccd, hardenixl ard pittedcan Mocn thrcxjgbout tho "tiro body of thr O-Rmfl.The sources of HEAT HARDENING ANO OXIDATION: Tempcratures higher than recoiTimenced for thr msteoal Elastomers becoming dry end pct lions of the niAlerial eviporet OxidationHow to eli

39、minate HEAT HARDENING AND OXIDATION: Lower the operdbng temp<xdtur» of the system Use O-Rings rated for higher tcmpcriXurcsJohnson *、Controls38Controls I Janiery 20094917.5 失效,SPIRAL DAMAGE0呼扭曲滾轉(zhuǎn)損壞.如右圖所示IDrscnptloa of Malure Appear a nee:Thg »urf(Ke of the O ing2 h«rw Xw ggwa 0* to

40、 here rolled in :,or against a guproeaer。0 tt st>/c - tn.s posien da frzdThe BQurcm of SRXKAL DAMAGC; Sido loads cusir ovrec&iuo rlcaranee Mli-nt coriooaents r*o su tabc 3心lk>n Motcitol too seft Movip tp<ee g Ioe Surf»CK arc* unpvanHow to eliminate SPIRAL DAMACf!Dzr23 ttw cKasrw tj

41、otwrrn romcxinMWi 5eck for roundness cf Atting pr*sMud山“fG» »、to M3l八 “ndhr Provide lubrication AdO a t>Kl*up ringb it nn 'i / . : 7. 6 0型圈失效EXTRUSIONo釵HI擠出失效 如右圖所示I7. 5 0型圈失效40Jotw i Controlt I January 2009Oc>crip<ion of failure oppeernca：Vou Mil' see 8 ndye nbble? oM ko&

42、quot; nir-in； pieces of tbc materieieither thennoi duari«t4tr cf outur rlumiKor duo frarr tlw doMFnof ttw O«R<<)Th* »OMrre« of EX VRUSION- Kjicessfvc ”、tcm ptesaurcs Tao mv<l>iMtweon *nK nq pa穴& Matcrul too aft 6 盹eg txxt/ tui> HfQe fee th- qojvc Imjropcriy mdc

43、hncd groove Attaek by «ste»n ruidMow to tllminaU iXTRUSIOM*Orcruajre or regulateRe*»t arQ B mW rlDQ D駅人 t< p- -pc . ccr)cc*'ti«. (it Sc-ccr 3 ba-<5cr mater al(Xrr】g tCf -Ct 0恥00 %»9UQAdd b4ck-wp rinti* RrtHrcr ORihq wii e«fTrrvrt t>pe orRe fhWe Qrtove to in

44、eude ee«n. gmoef <rve edev40Jotw i Controlt I January 20097. 7 0型圈失效7.7 失效,EXCESSIVE SWELLOS!H»脹失效 如右圖所示*Description of failure appearance:Idert fled by obvious dimension of the body of the O-Rina Reduced physical proper- hes, which cnusM mproprr nr. ttwit and rnction5eal failure.The source of EXCESSIVE SWELL: The matenol absorbs system fluids cousin sweihg An obviousincorrpatab iityHow to eliminate feXCiSSlVfe SWELL: Test material tor n. id rompatab tty Consult a chenrica compatab hty chart to determine stiitabie material7.0型圈失效WEATHERING OR OZONE CRACKING0裂老化/氧化失效 如