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MHXANE™ E™øTEPIKH™ KAY™H™ 1 (MEK)

Êï÷ëßáò áÝñá äéáðíïÞò

ÅëáôÞñéï ñýèìçóçò ÊùíéêÞ âåëüíá

ÄéáôïìÞ Venturi

×áìçëÞ ðßåóç

ÑïÞ áÝñá

Áêñïöýóéï ðáñï÷Þò

Áêñïöýóéï êùíéêÞò âåëüíáò Êõñßùò áêñïöýóéï ÕøçëÞ ðßåóç

™¯‹Ì· 7.14: AÚ¯‹ ÏÂÈÙÔ˘ÚÁ›·˜ ÂÍ·ÂÚȈً ÛÙ·ıÂÚÔ‡ ÎÂÓÔ‡.

¤Ì‚ÔÏÔ (‚·Ï‚›‰·) Ú‡ıÌÈÛ˘. ªÂ ÙËÓ ·‡ÍËÛË Ù˘ ıÂÚÌÔÎÚ·Û›·˜ ‰È·ÛÙ¤ÏÏÂÙ·È ÙÔ ‰ÈÌÂÙ·ÏÏÈÎfi ¤Ï·ÛÌ· Î·È ·Ó˘„ÒÓÂÈ ÙÔ ¤Ì‚ÔÏÔ. ªÂ ÙÔÓ ÙÚfiÔ ·˘Ùfi, ÌÂÈÒÓÂÙ·È Ë ˘Ô›ÂÛË ÛÙÔÓ ·Ó·‚Ú˘Ù‹Ú· Î·È Û˘ÓÂÒ˜ Î·È Ë ÚÔ‹ ÙÔ˘ η˘Û›ÌÔ˘.

7.8.4 ∫·Ù·Û΢·ÛÙÈο ÛÙÔȯ›· ÂÍ·ÂÚȈÙÒÓ ∏ ‰È¿ÌÂÙÚÔ˜ ¢ (mm) ÙÔ˘ ÛÒÌ·ÙÔ˜ ÙÔ˘ ÂÍ·ÂÚȈً ÂÍ·ÚÙ¿Ù·È ·fi ÙÔÓ Î˘‚ÈÛÌfi V (cm3) ÙÔ˘ Î˘Ï›Ó‰ÚÔ˘ Î·È ÙȘ ̤ÁÈÛÙ˜ ÛÙÚÔʤ˜ ÙÔ˘ ÎÈÓËÙ‹Ú· n (ÛÙÚ./sec), Ô˘ Â›Ó·È Î·È ÛÙÚÔʤ˜ Ù˘ ̤ÁÈÛÙ˘ ÈÔ‰‡Ó·Ì˘ Ù˘ Ì˯·Ó‹˜: ¢ = Vx n (7.7) 40 H ‰È¿ÌÂÙÚÔ˜ ‰ ÙÔ˘ ‚ÂÓÙÔ‡ÚÈ (ÓÙÈÊÈ˙¤Ú) ˘ÔÏÔÁ›˙ÂÙ·È Ì¤Û· ·fi Ì›· ·ÓÙ›ÛÙÔÈ¯Ë Û¯¤ÛË: ‰ = Vx n (7.8) 50 ™ÙÔ˘˜ ·ÁˆÓÈÛÙÈÎÔ‡˜ ÎÈÓËÙ‹Ú˜, ÛÙËÓ ·Ú·¿Óˆ ‰È¿ÌÂÙÚÔ ‰ ÚÔÛÙ›ıÂÙ·È Î·È Ë ‰ÈÔÚıˆÙÈ΋ ÙÈÌ‹

‰’ (mm): 2 ‰′ =n x V (7.9) 5 fiÔ˘ ÔÈ ÛÙÚÔʤ˜ n ÂÌÊ·Ó›˙ÔÓÙ·È ÙÒÚ· Û ¯ÈÏÈ¿‰Â˜ ÛÙÚÔÊÒÓ Î·È Ô fiÁÎÔ˜ ÙÔ˘ Î˘Ï›Ó‰ÚÔ˘ V Û ϛÙÚ·. µ¤‚·È·, ÌÂÙ¿ ÙÔÓ ˘ÔÏÔÁÈÛÌfi Ù˘ ÙÈÌ‹˜ Ù˘ ‰È·Ì¤ÙÚÔ˘, ÂÈϤÁÂÙ·È Ë ÏËÛȤÛÙÂÚË Ù˘ÔÔÈË̤ÓË ‰È¿ÌÂÙÚÔ˜ (.¯. 40¿ÚÈ ‹ 45¿ÚÈ ‚ÂÓÙÔ‡ÚÈ). ™ÙË Û˘Ó¤¯ÂÈ·, Ú¤ÂÈ Ó· ηıÔÚÈÛı› Ë ÙÈÌ‹ Ù˘ ‰È·Ì¤ÙÚÔ˘ ÙˆÓ ·ÎÚÔÊ˘Û›ˆÓ Î·È ‚·ÛÈο ÙÔ˘ ·ÚÈÔ˘ ·ÎÚÔÊ˘Û›Ô˘. ∏ ÙÈÌ‹ (̤ÁÂıÔ˜) ÙˆÓ ·ÎÚÔÊ˘Û›ˆÓ Ï·Ì‚¿ÓÂÙ·È Û ۯ¤ÛË Ì ÙȘ ÙÈ̤˜ ÙÔ˘ ‚ÂÓÙÔ‡ÚÈ Ô˘ ˘ÔÏÔÁ›˙ÂÙ·È ·fi ÙÔ˘˜ ·Ú·¿Óˆ Ù‡Ô˘˜. ∆Ô Ì¤ÁÂıÔ˜ ÙÔ˘ ·ÎÚÔÊ˘Û›Ô˘ ÙÔ˘ ÚÂÏ·ÓÙ› ÂÍ·ÚÙ¿Ù·È ·fi Ù· ¯·Ú·ÎÙËÚÈÛÙÈο ÙÔ˘ ÂÎÎÂÓÙÚÔÊfiÚÔ˘ ¿ÍÔÓ· Î·È ·fi ÙË ÛÂÈÚ¿ ·Ú·ÁˆÁ‹˜ ÙÔ˘ ÂÍ·ÂÚȈً. ¢È·Ù›ıÂÓÙ·È ‰È¿ÊÔÚ· ÓÔ‡ÌÂÚ· Ô˘ ‰ÔÎÈÌ¿˙ÔÓÙ·È ÛÙËÓ ÂÚÈÔ¯‹ 1.000 rpm ˆ˜ 2.500 rpm ÛÙÔ ‰ÚfiÌÔ Î·È ‰ËÌÈÔ˘ÚÁÔ‡Ó ·fi ÊÙˆ¯¿ Ì›ÁÌ·Ù·, .¯. 50 F 14, ˆ˜ Ôχ ÏÔ‡ÛÈ· Ì›ÁÌ·Ù·, .¯. 50F6. ∆¤ÏÔ˜, ÙÔ ·ÎÚÔʇÛÈÔ ÙÔ˘ ·¤Ú· ηıÔÚ›˙ÂÙ·È Î·Ù¿ ÙË ‰˘Ó·ÌÔ̤ÙÚËÛË ÙÔ˘ ÎÈÓËÙ‹Ú·.

7.8.5 ¶ÔÏÏ·ÏÔ› ÂÍ·ÂÚȈ٤˜ 7.8.5.1 ∂Í·ÂÚȈ٤˜ ‰ÈÏÔ‡ ÛÒÌ·ÙÔ˜ √È ÂÍ·ÂÚȈ٤˜ ·˘ÙÔ›, Ô˘ Â›Ó·È ÁÓˆÛÙÔ› Î·È ˆ˜ «‰ÈÏ¿ ηÚÌ˘Ú·Ù¤Ú», ¤¯Ô˘Ó ‰‡Ô ·ÚÈÔ˘˜ ·ÁˆÁÔ‡˜ ·¤Ú· ‹ ¯Ô¿Ó˜, οı ̛· ·fi ÙȘ Ôԛ˜ ¤¯ÂÈ ÙÔ ‰ÈÎfi Ù˘ Venturi Î·È Û‡ÛÙËÌ· ÙÚÔÊÔ‰ÔÛ›·˜, ·ÏÏ¿ Ì ÎÔÈÓfi ı¿Ï·ÌÔ ψًڷ (Û¯‹Ì· 7.15). √È ÂÙ·ÏÔ‡‰Â˜ ‚Ú›ÛÎÔÓÙ·È ÛÙÔÓ ›‰ÈÔ ¿ÍÔÓ· Î·È ·ÓÔÈÁÔÎÏ›ÓÔ˘Ó Ù·˘Ùfi¯ÚÔÓ·. ªÔÚ› Ó· ¤¯Ô˘Ó Î·È ‰Â˘ÙÂÚÂ‡Ô˘Û· ¯Ô¿ÓË Venturi ÛÙÔ ÛÒÌ·, ÙÔÔıÂÙË̤ÓË Ï›ÁÔ ÈÔ ÌÚÔÛÙ¿ ·fi ÙÔ Î‡ÚÈÔ Venturi, ÒÛÙ ӷ ·Ó·ÚÚÔÊ¿Ù·È ÂÚÈÛÛfiÙÂÚÔ Î·‡ÛÈÌÔ. ™Â οı ÛÒÌ· ˘¿Ú¯ÂÈ Â›Û˘ ¤Ó·˜ ·Ó·‚Ú˘Ù‹Ú·˜ Ì ۈÏËÓ¿ÎÈ ÚÔ·Ó¿ÌÂÈ͢ ·¤Ú·. ∏ ·ÓÙÏ›· ÂÈÙ¿¯˘ÓÛ˘ ·ÔÙÂÏÂ›Ù·È ·fi ¤Ó· ÂÌ‚ÔÏ›‰ÈÔ Ì ÂÏ·Ù‹ÚÈÔ Ô˘ „Âο˙ÂÈ Ì›· ÌÂÙÚË̤ÓË ÔÛfiÙËÙ· ‚ÂÓ˙›Ó˘. ∆Ô Ï‹ÎÙÚÔ ÙÔ˘ ÂÌ‚fiÏÔ˘ ÂϤÁ¯ÂÙ·È ·fi ¤Ó·Ó ÌÔ¯Ïfi, ·Úıڈ̤ÓÔ ÛÙÔÓ ¿ÍÔÓ· Ù˘ ÂÙ·ÏÔ‡‰·˜. 7.8.5.2 ¢›‰˘ÌÔÈ ÂÍ·ÂÚȈ٤˜ ¶ÔÏϤ˜ ÊÔÚ¤˜ ¯ÚËÛÈÌÔÔÈÔ‡ÓÙ·È ‰‡Ô ÂÍ·ÂÚȈ٤˜, ‹ ·ÎfiÌË Î·È ÙÚÂȘ, ÁÈ· Ó· ·˘ÍËı› Ë ÈÛ¯‡˜ ÙÔ˘


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