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¢Ã
¾Ð·Â°ú¼Óµµ ùÚÍ£ PV Limits
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·ÎŸ¸®¾Á ¼±Á¤½Ã °í·Á»çÇ× Rotary Sealing Considration |
¿¡³ÊÀÚÀÌµå ¾Á°ú ·ÎŸ¸® ¸³¾Á ¼³°è½Ã
Ưº°ÇÑ »çÇ×µéÀÌ °í·ÁµÇ¾î¾ß ÇÑ´Ù. ¿Õº¹¿îµ¿¿ë ¾Á(Reciprocating Seal)°ú´Â
´Þ¸®,ȸÀü¿ë ¾Á(Rotary Seal)¿¡¼´Â ¿©·¯StressµéÀÌ ÁýÁߵǴ ÀÛÀº ½Àµ¿¸é¿¡
±¹ºÎÀûÀ¸·Î ¹ß»ýÇÏ´Â ¿,¸¶Âû ¹× ¸¶¸ð°¡ ¾ÁÀÇ ¸¶¸ð¸¦ °¡¼ÓÈ ½ÃŲ´Ù. |
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- ¾Ð·Â°ú ¼Óµµ Pressure-Velocity |
¿¡³ÊÀÚÀÌµå ¾Á°ú ·ÎŸ¸® ¸³¾Á ¼³°è½Ã ÀÏÂ÷ÀûÀÎ
°í·Á»çÇ×Àº »ç¿ëȯ°æÀÇ ¾Ð·Â°ú ¼Óµµ°ª(PV)ÀÌ´Ù.
PV´Â ¸Åü(Media)ÀÇ ¾Ð·Â(Pressure : psi)°ú »çÇÁÆ®ÀÇ Ç¥¸é¼±¼Óµµ(surface
feet per minute : sfpm) ÀÇ °öÀÌ´Ù. (sfpm = »þÇÁÆ®°æinch×0.26×RPM)
eg) »þÇÁÆ®°æ : 2.500".3,000 rpmÀÎ °æ¿ì sfpm ; 0.26×2.500inch×3,000rpm=
1950sfpm ¾Ð·Â Pressure:50psiÀ̸é, PV Value : 1950×50=
97,500 |
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PV
Limit :PVÇÑ°è°î¼± ¾Æ·¡(Mild wear zone)¿¡¼´Â Á¤»óÀûÀÎ ¾à°£ÀÇ ¸¶¸ð°¡ ¹ß»ýÇϳª,ÇÑ°è°î¼±À»
³Ñ°ÔµÇ¸é(Severe wear zone) ½ÉÇÑ ¸¶¸ð°¡ ¹ß»ýÇÏ°ÔµÇ¸ç ±×¸¸Å ¾ÁÀÇ ¼ö¸íÀÌ ´ÜÃàµÈ´Ù.
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½ÇÁ¦ÀÇ PVÇÑ°è´Â ¾Ð·Â°ú ¼ÓµµÀÌ¿Ü¿¡,Operating
Temperature(»ç¿ë¿Âµµ).À±È°»óÅÂ,Á¢Ã˸éÀÇ Ç¥¸éÁ¶µµ, µî¿¡ µû¶ó ´Ù¸£´Ù. |
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¿Âµµ°¡ ³ôÀ»¼ö·Ï,»ç¿ë°¡´É¾Ð·Â°ú PVÇÑ°èÄ¡´Â °¨¼ÒÇÏ°í ¸¶¸ðÀ²ÀÌ
Áõ°¡µÈ´Ù. ³Ã°¢Á¦°¡ ÀÖÀ¸¸é ³ôÀº PVÀû¿ë¿¡¼ ¾ÁÀÇ ¸¶¸ð¸¦ ÁÙÀϼö ÀÖ´Ù. À±È°»óÅ°¡
ÁÁÀ»¼ö·Ï ´ç¿¬È÷ »ç¿ë°¡´É ¾Ð·Â°ú PVÇÑ°èÄ¡´Â Ä¿Áö°í ¸¶¸ðÀ²ÀÌ °¨¼ÒµÈ´Ù. |
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Rotary
Shaft Seal Selection between Spring Energized Seal and
Rotary Lip Seal |
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½ºÇÁ¸µ¿¡³ÊÀÚÀÌµå ·ÎŸ¸® ¾Á°ú ¸³¾ÁÀÇ ºñ±³ |
Spring
Energized Rotary Shaft Seal vs. Rotary Lip Seal |
½ºÇÁ¸µLoad(Spring
Force)°¡ ¾ø´Â ·ÎŸ¸® ¸³¾ÁÀº, sealing LipÀÇ loadingÇü½Ä°ú ¾Á ±¸Á¶¿¡¼ ¿¡³ÊÀÚÀ̵å
¾Á°ú Å« Â÷ÀÌ°¡ Àֱ⠶§¹®¿¡,»ç¿ë¾Ð·Â,¼Óµµ ¹× PV rating(¾Ð·Â*¼ÓµµÇÑ°è)¿¡¼ ½ºÇÁ¸µ¿¡³ÊÀÚÀ̵å
¾Á°ú´Â ´Ù¸£´Ù.
½ºÇÁ¸µ¿¡³ÊÀÚÀÌµå ·ÎŸ¸®¾ÁÀº ¸³¾Á º¸´Ù »ó´ëÀûÀ¸·Î Operating Pressure(»ç¿ë¾Ð·Â)Àº
³ôÀ¸³ª, ¹Ý¸é¿¡ Operating Velocity(»ç¿ë¼Óµµ :»þÇÁÆ®ÀÇ È¸Àü¼Óµµ,sfpm)´Â ³·´Ù.
¿¡³ÊÀÚÀ̵å·ÎŸ¸®¾ÁÀÇ Spring Èû(Load)Àº ¾ÁÀÇ ¹ÐÆó·ÂÀ» Å©°ÔÇØÁÖ´Â ¹Ý¸é¿¡,ÀÌ·¯ÇÑ ½ºÇÁ¸µÈûÀº
¶ÇÇÑ ¿ª½Ã ¾ÁÀÇ ¸¶Âû·Â°ú ¿¹ß»ýÀ» Áõ°¡½ÃŲ´Ù(¾ÁÀÇ ¸¶¸ð°¡ »¡¶óÁü).ÀÌ·¯ÇÑ ÀÌÀ¯·Î ¿¡³ÊÀÚÀÌµå ¾ÁÀÇ
ÃÖ´ë Ç¥¸é¼Óµµ(sfpm)°¡ Á¦ÇѵȴÙ.
MetalÄÉÀ̽ºÀÇ ¸³¾ÁÀÇ »ç¿ë¾Ð·ÂÀº Type¿¡ µû¶ó,150psi,250,500psi·Î,ÀÌ·¯ÇÑ
»ç¿ë¾Ð·ÂÀº ¸³¾ÁÀÇ ¾ãÀº Sealing Lip¿¡ ÀÇÇØ Á¦ÇÑÀ» ¹Þ´Â´Ù.±×·¯³ª ±×·¯ÇÑ ±¸Á¶Àû Â÷À̶§¹®¿¡
»ç¿ë¾Ð·ÂÀº Á¦ÇÑÀ» ¹Þ´Â ¹Ý¸é¿¡ Spring Load°¡ ¾ø±â¶§¹®¿¡(½ºÇÁ¸µ¿¡ ÀÇÇÑ ¸¶Âû°ú ¿¹ß»ýÀÌ
Àû¾î¼) ¿¡³ÊÀÚÀ̵å¾Á¿¡ ºñÇØ Operating Velocity(sfpm Ç¥¸é¼±¼Óµµ)Àº ³ô´Ù.
ƯÁ¤ÀÇ »ç¿ëȯ°æ¿¡¼ ¿¡³ÊÀÚÀÌµå ¾Á°ú ¸³ ¾ÁÁß¿¡¼ ¾î´À °ÍÀ» ¼±ÅÃÇÏ´Â °ÍÀÌ °¡Àå ÁÁÀº °¡´Â ±×
»ç¿ëȯ°æ¿¡¼ º¸´Ù Áß¿äÇÑ °í·Á¿ä¼Ò°¡ ¾Ð·ÂÀÌ³Ä ¾Æ´Ï¸é ¼ÓµµÀΰ¡¿¡ µû¶ó ´Þ¶óÁø´Ù. |
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ȸÀü¿ë ¾Á(Rotary Shaft Seal)ÀÇ ¼±Á¤ |
Rotary Shaft Seal Selection between Spring Energized
Seal and Rotary Lip Seal
À¯Ã¼¾Ð·ÂÀÌ
500psi(34.47bar,3.45Mpa.35.15Kg/cm2)°¡ ³ÑÀ¸¸é,¿¡³ÊÀÚÀÌµå ·ÎŸ¸®¾ÁÀ»
¾´´Ù. ¿¡³ÊÀÚÀ̵å¾ÁÀº ¿ø·¡°¡ »þÇÁÆ®¼Óµµ°¡ ³·Àº ³ôÀº ¾Ð·Â¿¡ »ç¿ëµÇµµ·Ï µÇ¾îÀÖ´Ù.
¾Ð·ÂÀÌ
500psiÀÌÇÏÀÌ°í ¼±¼Óµµ°¡ 100sfpm(surface feet per minute:0.508m/s)À»
³ÑÀ¸¸é ¸³¾ÁÀ» »ç¿ëÇÏ´Â °ÍÀ» °í·ÁÇÑ´Ù. |
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Seal
Design
Type No. |
Temp.
Range |
Max.psi
at 10 sfpm |
Max.sfpm
at 20 psi |
Normal
PV
Limit |
Rotary
Lip Seal |
-148~500¢µ
-100~260¡É |
150
psi
10bar |
8,000sfpm
40m/s |
160,000 |
FRS-104,FRS-105 |
Rotary Lip Seal |
-148~500¢µ
-100~260¡É |
250 psi
17.2bar |
10,000sfpm
50.8m/s |
250,000 |
FRS-103 |
Rotary
Lip Seal |
-148~500¢µ
-100~260¡É |
500psi
34.5bar |
4,000sfpm
20m/s |
160,000
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FRS-110 |
Spring Energized Seal |
-148~500¢µ
-100~260¡É |
2,000psi
138bar |
2,500sfpm
12.7m/s |
160,000 |
F700R |
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£ªÀ§ÀÇ ¼öÄ¡´Â 70¢µ(=21¡É),À±È°»óÅ¿¡¼ÀÇ
RatingÀÓ
£ªF700R : surface speed 15m/s.Max Operating Pressure is dependent
upon the rotational speed. |
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