Hpaga lam hta, sealing galaw na lit nga ai engineer ni gaw, project team langai hta grau nna ra sharawng ai ni rai ma ai.
Dai jak gaw hkrak hkrak bungli galaw nga ai shaloi, kadai mung nang hpe n myit ai; rai tim, dai jak gaw, mari ai wa a shara kaw (hka, sau, wan sau) lwi pru wa ai shaloi, shawng nnan mara shagun hkrum ai wa gaw, n-gun n rawng ai sha, sealing engineer rai na re.
Structural engineer wa gaw, hka htung a shadawn shadang ni hpe shawng jep yu nna, hkam sharang lu ai atsam masat masa ni hte maren hkrak hkrak ka da ai hpe kam ai. Dai hpang IQC dap gaw, jak rung a jahpan hpe jep joi nna, jak rung kaba ni jaw ai arung arai ni gaw ra ai madang yawng hpe hkan sa ai kun ngu ai hpe jep joi ai. Hpang jahtum e, hkrat sum ai lam hpe sawk sagawn na lit gaw, sealing engineer a ntsa e hkrat sum mat ai.
Nang gaw n kaja ai O-ring hpe shaw kau sai; shi a ntsa gaw n hkrat sum ai, n-gun n rawng ai (sh) chemical corrosion a kumla ni n nga ai. Galai shai ai lam langai sha gaw, dai hpe n-gun n rawng hkra galaw kau ai majaw, shawng na hkrang hpe bai n mai galaw mat sai.
Ndai madang hta, garan jaw ai wa a arung arai masat masa hta ka da ai tensile n-gun hte Shore hardness manu ni hpe sha myit maju jung ai gaw, hkrat sum ai lam a tengman ai lam hpe n chye lu na re.
Sealed polymer arung arai ni a ginra hta, aten galu-sealing galaw lu ai atsam hpe arung arai a ngang kang ai lam (sh) n-gun atsam n-gun atsam hku nna n re ai sha, chyahkring hkring n-gun n jaw ai parameter langai mi hku nna dawdan ai: compression set (CS).
Ndai parameter hpe ningmu masum hku nna sung sung sawk sagawn yu ga.
0 1
Dazik shakap ai – teng sha hpa hpe dazik shakap nga ai kun?
Compressive permanent deformation hpe n tsun shi yang, masha law malawng chye na shut ai jak hpaji hpe sharai la na matu ahkyak nga ai: sealing gaw "hkap pat shingdang ai" hta n-ga, "madi shadaw ai" hta madung tawn ai.
sumla
Silicone O-ring hpe magri n-gang kata de bang nna, flange hpe ngang ngang jum da ai shaloi, silicone hpe n-gun dat dat ai (15%–30% ratio de n-gun dat dat ai).
Silicone gaw grai n-gun ja ai arung arai langai mi re. Compress galaw ai shaloi, shi a molecular chain ni hpe atik anang galai shai kau ya ai majaw, n-gun ja ai bai nhtang wa ai n-gun (contact stress) hpe shabyin ya nna, shi a shawng na masa de bai nhtang wa na matu shakut nga ai.
Ndai rebound n-gun gaw magri bunghku hpe ngang ngang ninghkap ai; theoretically hku yu yang, kata na ntsin a pressure hpe lai di ai shaloi, medium gaw tsep kawp n pru na re.
Dai majaw, shinggrup ai lam a madung gaw, shinggrup ai npu hta silicone molecular chain ni hku nna elastic force hpe matut manoi jaw ya ai majaw, magri ntsa e ngang ngang jum da lu ai.
0 2
Seal hkrat sum ai lam gaw hpa majaw rai kun?
Dazik shakap ai lam gaw bai gram lajang ya ai atsam hpe kam hpa ai majaw, ndai atsam n nga mat yang hpa byin na kun?
Compressive ngu ai gaw hpa rai ta?
Anhte gaw silicone gel hpe 25% daram shinggrup nna, 120℃hta hkying hkum 70 daram wan wut ai hpang, shaw la nna, katsi mat hkra tawn da nna, shawng na hkrang de bai nhtang wa ai.
Shi a shawng na n-gun hpe tup hkrak bai gram lajang lu yang, CS=0% (teng sha n nga ai hkum tsup ai elastomer).
Hkum tsup hkra n-gun n rawng mat nna, n-gun n rawng mat yang, CS=100% (rigid plastic byin mat sai hpe madun ai).
Hpa majaw molecular chain ni gaw "shanhte a shawng na masa de bai nhtang wa lu ai" kun? Manghkang gaw Microscopic madang hta nga ai:
Hkum hkrang madang – Myit ru myit tsang lam hpe shayawm ya ai hte Chain Segmentation hpe bai gram lajang ai
Silicone gaw galu kaba ai molecular chain ni shada da matut mahkai ai majaw byin pru wa ai re. Katsi ai shara hta aten galu n-gun dat ai shaloi,
Shi a kata na myit ru myit tsang lam hpe loi loi hte shayawm kau nna bai gram lajang ai hku nna shayawm ya ai.
Dai gaw, shingkyit langai a lawu kaw na shingkyit shingkyit hpe laning mi tup dip da ai hte bung ai-nang shaw la ai aten du hkra, dai shingkyit gaw shi a shingkyit nsam hpe galai shai kau sai rai nna, shawng na shingkyit hpe bai n lu hkam la lu sai.
Ndai hkum hkrang "compromise" a majaw, bai nhtang wa ai n-gun gaw loi loi hte yawm mat wa ai.
Chemical madang – Cross-hkap la ai matut mahkai lam ni hpe dawm kau nna bai gram lajang ai lam
Ndai gaw ahkyak dik ai lam rai nga ai. Silicone a n-gun gaw molecular n-gang ni a lapran na cross-matut mahkai ai lam (sulfur-sulfur n-gang zawn re ai) hta madung nga ai.
Katsi majan kaba hte aten galu shinggrup da ai npu hta, npawt nhpang cross-linking bonds ni daw mat nna, elastic traction n-gun hpe sum mat shangun ai.
Grau nna ahkyak ai gaw, daw garan ai majaw byin pru wa ai free radicals ni gaw, dai arai a n-gun rawng ai masa hta, cross-linked bonds nnan ni hpe bai hpaw shabawn nna, molecular chain ni hpe "flat state" hta hkrak hkra shinggrup da na re. Shinggan na n-gun hpe shapraw kau ngut ai hpang pyi, ndai chemical bonds nnan ni gaw, dai arai hpe shawng na hkrang de bai n htang wa hkra pat shingdang ya ai.
Hkum hkrang n-gun shayawm ai + tsi mawan bai kahkyin gumdin ai=n-gun shayawm ai prat tup n-gun shayawm ai lam.
CS manu grau tsaw ai gaw, silicone gel hpe grau n-gun ja shangun nna, matut mahkai ai lam hta grau n-gun kya shangun ai. Hpang jahtum, hka n-gun hte shingdaw yang, bai nhtang wa ai n-gun n law wa ai shaloi, hka pru wa ai.
0 3
Ndai lam hpe engineering ningmu hku nna gara hku hparan ra na kun?
Ya, dai lam a npu e nga ai ladat ni hpe chye na sai majaw, dazik ni hpe hkrang shapraw ai shaloi, arung arai ni hpe lata ai shaloi, ndai hkrit tsang hpa hpe gara hku koi lu na kun?
1. CS data hpe lachyum shapraw ai shaloi, chyam dinglik ai masa ni hpe galoi mung asan sha tsun dan ra ai.
Hpaga ga ai wa jaw ai hkum hkrang arung arai table hta "compression npu hta prat tup hkra machyi ai lam: 25%" ngu ka da ai.Raitim, gara nbung laru hta, gara compression ratio npu hta, kade daram na hkra ndai shadawn shadang ni hpe galaw ai kun?
CS manu hpe 100℃hta 25% hta shadawn yang, 150℃a tengman ai bungli galaw ai masa hta 50% jan de rawt jat wa chye ai, hpa majaw nga yang, lawan ladan byin wa ai thermal hte oxidative aging a majaw re.
Madung ra kadawn ai lam gaw, CS manu hpe jep joi ai shaloi, chyam dinglik ai nbung n-gun gaw, dai arai a bungli galaw ai nbung n-gun hta n yawm ging ai, chyam dinglik ai aten gaw n yawm htum hkying hkum 70 (sh) hkying hkum 168 rai ra ai. Dai zawn re ai data ni sha lata la na matu kaja ai reference langai hku nna mai lang ai.
2. Myi nmu ai sha ngang kang ai lam hpe jat wa ai hta, cross-linking system hpe myit maju jung u .
CS manu gaw ra kadawn ai lam ni hpe n htap htuk ai rai yang, silicone gel a n-gun hpe jat nna gram lajang na matu hkum shakut -n-gun ja ai gaw prat tup n-gun n rawng ai hpe n mai gram lajang ai. De a malai, shang lawm ai lam hpe dai arai a chemical cross-linking system hpe madung tawn nna galaw ra ai.
NBR (sh) EPDM hpe ga shadawn hku la ga nga yang: htunghking hku galaw ai sulfur vulcanization ladat ni gaw, n-gun n law ai sulfur-sulfur bonds ni hpe shabyin ya ai, dai ni gaw nbung katsi ai shara hta daw mat nna bai gram lajang chye ai majaw, CS manu ni n kaja ai.
Peroxide vulcanization system hpe hkap la ai hku nna, carbon-carbon single bonds ni byin pru wa ai, dai ni gaw bond n-gun kaba hpe madun dan nna, n-gun kaba ai -n-gun n-gun npu hta garan ginhka ai lam hte bai hpawng de ai lam hpe ninghkap lu ai majaw, prat tup n-gun shayawm ai lam hpe grai shayawm ya lu ai.
Dai hpaga yumga-off gaw peroxide-vulcanized arung arai ni a myi prwi hpe ninghkap lu ai atsam yawm mat ai lam re. Ndai gaw "non-tearability" hpe lu la na hte "rebound properties" hpe makawp maga na lapran na rap ra ai lam hpe madi madun ai.
3. Structural design hku nna arung arai CS hpe shayawm kau ai lam hpe gram lajang ai
Dai arai a CS manu hpe shi a hkum hkrang shadawn sharam (ga shadawn, 30%) du hkra gram lajang da sai rai yang, aten galu-lang ai aten hta matut nna sealing galaw ai lam hpe gara hku galaw lu na kun?
Dai gaw hkam sharang lu ai atsam nkau mi sum mat na hpe anhte chye ai majaw, ndai sum mat ai lam hpe groove dimensions ni hpe hkrang shapraw ai shaloi compression allowance hta bang ra ai.
Raitim, compression ratio hpe gaw n-htum n-wai jat na matu n mai byin ai. Compression rate grai law ai shaloi (40% jan ai shaloi), polymer kata na kata na n-gun gaw grai law jat wa ai majaw, molecular chain ni hpe aten garai n du shi yang mechanical hku daw kau ya nna, dai a majaw CS hpe lawan ladan hkra machyi shangun ai.
Kaja dik htum ladat gaw, npawt nhpang hpaji ninghkring ni hte arung arai hpaji ninghkring ni rau jawm nna, n-gun shayawm ai curve- hpe madung tawn nna, silicone a n-gun shayawm ai lam hpe n jahten ai sha, shi ning na ai hpang, n-gun shayawm ai lam hpe n-gun shayawm ai lam hpe n-gun shayawm ai lam hpe jawm galaw na matu re.
Dazik hpe hpan shalat ai ngu ai gaw madung hku nna aten a jinghku mung, aten a hpyen mung tai wa ai lachyum rai nga ai.
Tengman ai sealing engineer gaw, shinggyin ngut ai aten hta hka n shang hkra galaw na matu sha myit maju n jung ai.
Shanhte a myit tsang ai lam gaw, masum, manga, shi ning pyi na ai hpang-n-gun ja ai nbung laru hte n-gun ja ai n-gun kaba ai npu hta-molecular chain gaw magri ntsa hta ngang ngang naw jung nga na kun ngu ai hta rai nga ai.
Nang hta n-gun n rawng ai sha, n-gun rawng ai hpe n chye lu ai, shing nrai, garan jaw ai wa a sutgan table ni hpe myit ung ang ai hku mu yang-na a sumla ni hte hkrat sum mat ai sample ni hpe anhte a dut mari engineer hpe matut mahkai na matu hkum tsang.