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التكهف.pptx
1.
التكهف cavitation • التكهف تعريف • حدوثه أماكن • التكهف
اضرار • طرق تجنب حدوثه
2.
التكهف هو ما • إلى
يؤدي البخارمما ضغط إلى المائع ضغط انخفاض ظاهرة هى انفجا لها يحدث والتى المائع داخل البخار من فقاعات تكون ر تسب مما أعلى ضغط لمنطقة انتقالها او بسطح تالمسها عند ب بالسطح اهتزاز وحدوث السطح هذا بتشوه
3.
التكهف؟ يحدث اين • الطلمب
فى غالبا التكهف يحدث ات الخاص السحب خط فى وذلك الض انخفاض نتيجة بالطلمبة غط المتكونة الضغط وفقاعات به بمروحة اصطدام عند تنفجر الطلمبة impeller فى هتسيب سطحه تشوه
4.
الطلمبات على التكهف
اضرار • عمرالمضخة تقليل • الطلمبة بريشة تاكل التكهف يحدث impeller على انفجارها عند البخار فقاعات تسبب حيث ال وجسم الريشة سطح volute حدوث فى pitting وتشوه المدن سطح فى نحر او نقر او حدوث يسبب كما vibration عالى اهتزاز الت كراسى تلف إلى يؤدي قد والذى بالطلمبة حميل bearings سيل الميكانيكل فى كسر حدوث او mechanical seal
5.
طرق تجنب التكهف حدوث • او استاتيكى
ضغط وجود head • ال تقليل friction السحب خط فى suction line • ال تنظيف strainer المضخة المائع دخول قبل الموجود • ال نوعية material ب الخاصة impeller ال أن حيث impeller الزهر حديد من المصنع ال من المصنوع من للتكهف عرضة اكثر stainless steel • التاكل حدوث منع corrosion السحب اختناق الى ويؤدى السحب مواسير داخل يحدث الذى وا نخفاض مواد باضافة وذلك السحب ضغط anti corrosion مواسير استخدام او للمائع ذات material االستانلس مواسير مثل للصدا مقاومة او مجلفنة • البخار ضغط لتقليل وذلك منخفضة السحب حرارة درجة على الحفاظ • يكون الزم السحب ماسورة قطر اكبر من قطر ماسورة الطرد
6.
هامة مالحظات • بالطلمبة الخاص
الطرد خط على الموجودة الرجوع عدم بلوف صيانه من التأكد يجب وجود الن بهم خاص هيدر فى وتطرد التوازى على متركبة طلمبات وجود عند خاصة الطل إلى األخرى الطلمبات من الخارج المياه ضغط رجوع فى تسبب سوف به مشكلة مبة وعن االتجاه عكس الطلمبة عمود دوران فى تسبب سوف وبالتالي الخدمة من إلخارجة د ع عزم يحدث سوف فجأه الطلمبة تشغيل ك تهر أن كما العمود كسر إلى يؤدي قد سى يب فى الموجودة الطلمبات من الخارج الضغط يهدر سوف الرجوع عدم محبس من الضغط الخدمة • الن وذلك تدريجيا وفتحه الطرد محبس غلق يجب الطلمبة تشغيل بدايه فى start current أضعاف ثالثة بيوصل التشغيل بدايه فى جدا عالى بيكون الطلمبة بتاع وعند تيار اقل وبالتالي قدرة اقل بيكون التشغيل بدايه فى الطرد محبس غلق
7.
سؤال ؟؟ • ماذا يحدث عند تشغيل طلمبة الطرد المركزى centrifugal pump باستخدام مائع ذو لزوجة عالية مثل الزيوت ؟
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