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Cavitation

The document discusses pump cavitation, which occurs when the suction pressure at the pump inlet drops below the vapor pressure of the fluid being pumped. This can cause vapor bubbles to form in the fluid and be drawn into the pump. The document lists the minimum and maximum allowable suction pressures for several common pump types and explains that keeping the pump close to the fluid surface helps prevent cavitation by making it easier for the fluid to be drawn into the pump.

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carlosccc
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0% found this document useful (0 votes)
21 views5 pages

Cavitation

The document discusses pump cavitation, which occurs when the suction pressure at the pump inlet drops below the vapor pressure of the fluid being pumped. This can cause vapor bubbles to form in the fluid and be drawn into the pump. The document lists the minimum and maximum allowable suction pressures for several common pump types and explains that keeping the pump close to the fluid surface helps prevent cavitation by making it easier for the fluid to be drawn into the pump.

Uploaded by

carlosccc
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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‫راه ﺣﻞ ﺟﺎﻣﻊ ﺳﯿﺴﺘﻤﻬﺎی ﻫﯿﺪروﻟﯿﮏ‬ ‫ﺑﻨﯿﺎن ﺗﺪﺑﯿﺮ ﭘﺎرس‬

‫‪Total Hydraulic System Solution Provider‬‬

‫ﻛﺎوﻳﺘﺎﺳﻴﻮن ﭘﻤﭗ‬
‫‪Pump Cavitation‬‬

‫ﻣﺎ ﺗﺠﺮﺑﻴﺎت و داﻧﺶ ﻫﻴﺪروﻟﻴﻚ ﺧﻮد را ﺑﺎ ﺷﻤﺎ ﺑﻪ اﺷﺘﺮاك ﻣﻴﮕﺬارﻳﻢ‬

‫)ﻛﻠﻴﻪ ﺣﻘﻮق اﻳﻦ اﺛﺮ ﺑﺮاي ﺷﺮﻛﺖ ﺑﻨﻴﺎن ﺗﺪﺑﻴﺮ ﭘﺎرس ﻣﺤﻔﻮظ ﻣﻴﺒﺎﺷﺪ(‬
‫اﺳﺘﻔﺎده آﻣﻮزﺷﻲ از اﻳﻦ اﺛﺮ ﺑﺮاي ﻣﺪرﺳﻴﻦ و ﻛﺎرﺑﺮان ﻫﻴﺪروﻟﻴﻚ ﻣﺠﺎز ﻣﻴﺒﺎﺷﺪ‬

‫اﻳﻤﻴﻞ ‪info@btpco.com :‬‬ ‫ﻓﻜﺲ ‪(021)55277961 :‬‬ ‫ﺗﻠﻔﻦ ‪(021)55278117-8 :‬‬

‫‪١‬‬ ‫ﺻﻔﺤﻪ ‪:‬‬ ‫‪www.btpco.com‬‬


‫راه ﺣﻞ ﺟﺎﻣﻊ ﺳﯿﺴﺘﻤﻬﺎی ﻫﯿﺪروﻟﯿﮏ‬ ‫ﺑﻨﯿﺎن ﺗﺪﺑﯿﺮ ﭘﺎرس‬

‫‪Total Hydraulic System Solution Provider‬‬

‫ﻓﺸﺎر ﻣﻜﺶ ﭘﻤﭗ ﻛﻪ ﻣﻌﻤﻮﻻ ﺑﺎ واﺣﺪ ‪ bar‬ﺑﻴﺎن ﻣﻴﺸﻮد ﻧﺸﺎﻧﮕﺮ ﻣﺤﺪوده ﻗﺎﺑﻞ ﻗﺒﻮل ﺑﺮاي اﻋﻤﺎل ﻓﺸــﺎر در دﻫﺎﻧــﻪ‬
‫ورودي ﭘﻤﭗ اﺳﺖ‪ .‬ﺑﺎ اﺗﺼﺎل ﺧﻂ ﻣﻜﺶ در ﺳﻴﺴﺘﻢ ﻫﻴﺪروﻟﻴﻚ ﺑﻪ دﻫﺎﻧﻪ ورودي ﭘﻤــﭗ‪ ،‬روﻏــﻦ از ﻣﺨــﺰن ﺑــﻪ‬
‫ﺳﻤﺖ ﭘﻤﭗ ﻛﺸﻴﺪه ﻣﻴﺸﻮد‪ .‬اﻟﺒﺘﻪ ﻻزم اﺳﺖ ﺗﻮﺟﻪ ﺷﻮد ﻛﻪ "ﻣﻜﺶ" ﻓﻘﻂ ﻛﻠﻤﻪ اي اﺳﺖ ﻛــﻪ ﺑــﺮاي ﻧﺸــﺎن دادن‬
‫ﺳﻤﺖ روﻏﻦ ﮔﻴﺮي ﭘﻤﭗ ﺑﻜﺎر ﻣﻴﺮود و اﺻﻮﻻ ﻣﺎﻳﻌﺎت ﻗﺎﺑﻞ ﻛﺸﻴﺪه ﺷﺪن ﻧﻴﺴﺘﻨﺪ ﺑﻠﻜﻪ ﺑﺎ ﻧﻴﺮوي ﻓﺸــﺎر ﺧــﺎرﺟﻲ‬
‫ﻫﻞ داده ﻣﻴﺸﻮﻧﺪ‪.‬‬

‫ﻣﻮﻗﻌﻴﺖ دﻫﺎﻧﻪ ﻣﻜﺶ ﭘﻤﭗ و اﺗﺼﺎل آن ﺑﻪ ﻣﺨﺰن‬

‫ﻗﺪرت ﻣﻜﺶ ﻳﻚ ﭘﻤﭗ ﺑﺴﺘﮕﻲ ﺑﻪ ﻣﻴﺰان اﺧﺘﻼف ﻓﺸﺎر ﺳﻤﺖ ﻣﻜﺶ ﭘﻤﭗ و ﻓﺸﺎر ﻫﻮاي روي ﺳﻄﺢ ﻣﺎﻳﻊ‬

‫دارد‪ .‬ﺑﻨﺎﺑﺮاﻳﻦ ﺣﺘﻲ اﮔﺮ ﻳﻚ ﭘﻤﭗ ﺑﺘﻮاﻧﺪ ﺗﻮﻟﻴﺪ ﺧﻼ ﻣﻄﻠﻖ ﻧﻤﺎﻳﺪ‪ ،‬ﻣﻘﺪار ارﺗﻔﺎع ﻛﺸﺶ ﻣﺎﻳﻊ آن از ﺣﺪاﻛﺜﺮ ﻧﻴﺮوي‬

‫ﻓﺸﺎر ﺟﻮ ﺗﺠﺎوز ﻧﻤﻲﻧﻤﺎﻳﺪ و ﺣﺪ ﻧﻬﺎﻳﻲ ارﺗﻔﺎع ﻛﺸﺶ را ﺣﺪاﻛﺜﺮ ﻓﺸﺎر وارده ﺑﺮ ﺳﻄﺢ ﻣﺎﻳﻊ از ﻃﺮف ﻫﻮاي‬

‫ﺑﻴﺮون ﺗﻌﻴﻴﻦ ﻣﻴﻜﻨﺪ‪ .‬از اﻳﻦ رو ارﺗﻔﺎع ﻣﻜﺶ ﭘﻤﭙﻬﺎ ﻣﺤﺪود ﻣﻴﺒﺎﺷﺪ و ﻫﺮ ﭼﻪ ﭘﻤﭗ ﻧﺰدﻳﻜﺘﺮ ﺑﻪ ﺳﻄﺢ ﻣﺎﻳﻊ ﻧﺼﺐ‬

‫ﺷﻮد‪ ،‬ﻣﺎﻳﻊ راﺣﺖ ﺗﺮ و آﺳﺎن ﺗﺮ ﺑﻪ ﺳﻤﺖ ﭘﻤﭗ راﻧﺪه ﻣﻴﺸﻮد و اﺣﺘﻤﺎل اﻳﺠﺎد ﻛﺎوﻳﺘﺎﺳﻴﻮن در آن ﻛﻤﺘﺮ ﻣﻴﺸﻮد‪.‬‬

‫در ﺟﺪول زﻳﺮ ﻓﺸﺎر ﺣﺪاﻛﺜﺮ و ﺣﺪاﻗﻞ ﻣﺠﺎز در ورودي ﭼﻨﺪ ﭘﻤﭗ ﻧﻤﻮﻧﻪ اراﺋﻪ ﺷﺪه اﺳﺖ‪.‬‬
‫‪٢‬‬ ‫ﺻﻔﺤﻪ ‪:‬‬ ‫‪www.btpco.com‬‬
‫راه ﺣﻞ ﺟﺎﻣﻊ ﺳﯿﺴﺘﻤﻬﺎی ﻫﯿﺪروﻟﯿﮏ‬ ‫ﺑﻨﯿﺎن ﺗﺪﺑﯿﺮ ﭘﺎرس‬

‫‪Total Hydraulic System Solution Provider‬‬


‫‪Pabs min= 0.7bar , max= 3bar‬‬ ‫ﭘﻤﭗ دﻧﺪه اي‬
‫‪Pabs min= 0.83bar , max= 2.4bar‬‬ ‫ﭘﻤﭗ ﺟﺎﺑﺠﺎﺋﻲ ﺛﺎﺑﺖ ﺗﻴﻐﻪ اي‬
‫‪Pabs min= 0.7bar , max= 2bar‬‬ ‫ﭘﻤﭗ ﺟﺎﺑﺠﺎﺋﻲ ﺛﺎﺑﺖ ﭘﻴﺴﺘﻮﻧﻲ اﻛﺴﻴﺎل – ‪A2FO‬‬

‫‪Pabs min= 0.8bar , max= 30bar‬‬ ‫ﭘﻤﭗ ﺟﺎﺑﺠﺎﺋﻲ ﻣﺘﻐﻴﻴﺮ ﭘﻴﺴﺘﻮﻧﻲ اﻛﺴﻴﺎل – ‪A10VSO‬‬

‫) ‪ ( Pin‬ﻣﺠﺎز در ورودي ﭘﻤﭙﻬﺎي ﻣﺨﺘﻠﻒ ) ﻣﺤﺼﻮﻻت رﻛﺴﺮوت (‬

‫ﭘﺪﻳﺪه ﻛﺎوﻳﺘﺎﺳﻴﻮن در ﭘﻤﭗ‬

‫ﻫﻨﮕﺎﻣﻲ ﻛﻪ ﻓﺸﺎر ﻣﻜﺶ در ورودي ﭘﻤﭗ از ﺣﺪ ﻓﺸﺎر ﺗﺒﺨﻴﺮ روﻏﻦ ﻛﻤﺘﺮ ﺷﻮد )ﻣﻌﻤﻮﻻ ﻛﻤﺘﺮ از ‪(–0.3bar‬‬

‫اﻣﻜﺎن ﺗﺒﺨﻴﺮ روﻏﻦ و ورود آن ﺑﻪ داﺧﻞ ﻣﺎﻳﻊ و ﻫﻤﭽﻨﻴﻦ ورود ﺣﺒﺎﺑﻬﺎي ﻫﻮا ﺑﻪ داﺧﻞ روﻏﻦ ﺑﻮﺟﻮد ﻣﻲآﻳﺪ‪.‬‬

‫اﻳﻦ ﺑﺨﺎرﻫﺎ ﻫﻨﮕﺎﻣﻲ ﻛﻪ از ﻧﺎﺣﻴﻪ ﻛﻢ ﻓﺸﺎر ﺑﻪ ﻣﻨﻄﻘﻪ ﭘﺮ ﻓﺸﺎر ﭘﻤﭗ ﻣﻨﺘﻘﻞ ﻣﻴﺸﻮﻧﺪ‪ ،‬ﺑﻪ ﺻﻮرت ﻧﺎﮔﻬﺎﻧﻲ ﺗﺤﺖ‬

‫ﻓﺸﺎر زﻳﺎدي ﻗﺮار ﮔﺮﻓﺘﻪ و ﻣﻨﻔﺠﺮ ﻣﻴﺸﻮﻧﺪ‪ .‬اﻳﻦ ﭘﺪﻳﺪه ﺑﺎﻋﺚ اﻳﺠﺎد ﻳﻚ ﻣﻮج اﻧﻔﺠﺎري ﭘﺮ ﻓﺸﺎر در روﻏﻦ ﻣﻴﺸﻮد‬

‫ﻛﻪ ﻧﺘﻴﺠﻪ آن ﺑﻮﺟﻮد آﻣﺪن ﻧﻴﺮوﻫﺎي ﺿﺮﺑﻪ اي ﺑﺮ روي اﺟﺰاء ﭘﻤﭗ ﻣﻴﺒﺎﺷﺪ‪ .‬اﻳﻦ ﻧﻴﺮوﻫﺎ ﺑﻪ ﺳﺮﻋﺖ ﺑﺎﻋﺚ اﻳﺠﺎد‬

‫ﺧﻮردﮔﻲ در اﺟﺰاء ﻓﻠﺰي ﭘﻤﭗ ﻣﻴﮕﺮدد و ﻋﻤﺮ ﻣﻔﻴﺪ ﭘﻤﭗ را ﻛﺎﻫﺶ ﻣﻲدﻫﺪ‪.‬‬

‫‪٣‬‬ ‫ﺻﻔﺤﻪ ‪:‬‬ ‫‪www.btpco.com‬‬


‫راه ﺣﻞ ﺟﺎﻣﻊ ﺳﯿﺴﺘﻤﻬﺎی ﻫﯿﺪروﻟﯿﮏ‬ ‫ﺑﻨﯿﺎن ﺗﺪﺑﯿﺮ ﭘﺎرس‬

‫‪Total Hydraulic System Solution Provider‬‬

‫ﺗﻮﻟﻴﺪ و رﺷﺪ ﻛﺎوﻳﺘﺎﺳﻴﻮن‬

‫اﺻﻮل زﻳﺮ ﺑﺎﻋﺚ ﺣﺬف ﭘﺪﻳﺪه ﻛﺎوﻳﺘﺎﺳﻴﻮن ﻣﻴﮕﺮدد‪ .‬اﻳﻦ اﻣﺮ ﺑﺎ ﺑﺎﻻ ﻧﮕﻪ داﺷﺘﻦ ﻓﺸﺎر ﻣﻜﺶ ﺑﻴﺶ از ﺳﻄﺢ ﻓﺸﺎر‬

‫اﺷﺒﺎع روﻏﻦ اﺗﻔﺎق ﻣﻲاﻓﺘﺪ‪.‬‬

‫‪ ‬ﺳﺮﻋﺖ روﻏﻦ در ﺧﻂ ﻣﻜﺶ ﻛﻤﺘﺮ از ‪ 1.5m/sec‬در ﻧﻈﺮ ﮔﺮﻓﺘﻪ ﺷﻮد‪.‬‬

‫‪ ‬ﻓﺎﺻﻠﻪ ﺑﻴﻦ ﻣﺨﺰن ﺗﺎ ﭘﻤﭗ‪ ،‬ﺣﺪاﻗﻞ ﻣﻘﺪار ﻣﻤﻜﻦ ﺑﺎﺷﺪ‪.‬‬

‫‪ ‬ﺗﻌﺪا اﺗﺼﺎﻻت ﺑﻴﻦ ﻣﺨﺰن و ﭘﻤﭗ ﺣﺪاﻗﻞ ﺑﺎﺷﺪ‪.‬‬

‫‪ ‬از ﺻﺎﻓﻲ و ﻓﻴﻠﺘﺮﻫﺎي ﺑﺎ اﻓﺖ ﻓﺸﺎر ﭘﺎﺋﻴﻦ و ﻫﻤﺮاه ﺑﺎ ﻧﺸﺎﻧﮕﺮ اﻧﺴﺪاد اﺳﺘﻔﺎده ﺷﻮد‪.‬‬

‫‪ ‬از روﻏﻦ ﺑﺎ وﻳﺴﻜﻮزﻳﺘﻪ ﻣﻨﺎﺳﺐ ﺑﺮاي ﭘﻤﭗ اﺳﺘﻔﺎده ﺷﻮد‪.‬‬

‫‪۴‬‬ ‫ﺻﻔﺤﻪ ‪:‬‬ ‫‪www.btpco.com‬‬


‫راه ﺣﻞ ﺟﺎﻣﻊ ﺳﯿﺴﺘﻤﻬﺎی ﻫﯿﺪروﻟﯿﮏ‬ ‫ﺑﻨﯿﺎن ﺗﺪﺑﯿﺮ ﭘﺎرس‬

‫‪Total Hydraulic System Solution Provider‬‬

‫ﺗﻴﻢ ﻣﻬﻨﺪﺳﻲ ﺷﺮﻛﺖ ﺑﻨﻴﺎن ﺗﺪﺑﻴﺮ ﭘﺎرس‬


‫ﭘﺎﺳﺨﮕﻮي ﺳﺌﻮاﻻت ﻓﻨﻲ ﺷﻤﺎ ﺟﻬﺖ ﻃﺮاﺣﻲ و ﺳﺎﺧﺖ اﻧﻮاع ﺳﻴﺴﺘﻤﻬﺎي ﻫﻴﺪروﻟﻴﻚ ﻣﻴﺒﺎﺷﺪ‬

‫اﻳﻤﻴﻞ ‪info@btpco.com :‬‬ ‫ﻓﻜﺲ ‪(021)55277961 :‬‬ ‫ﺗﻠﻔﻦ ‪(021)55278117-8 :‬‬

‫‪۵‬‬ ‫ﺻﻔﺤﻪ ‪:‬‬ ‫‪www.btpco.com‬‬

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