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انواع پمپ دنده ای
جدول مشخصات فنی
طرز کار انواع پمپ دنده ای
این پمپ ها از عمل چرخش چرخ دنده‌ها برای جابجایی سیالات استفاده می‌کند. عامل چرخش، سیال را در محفظه پمپ محصور کرده
و مکشی را در دهانه پمپ ایجاد می‌کند. سیال با کشیده شدن در پمپ، درون حفره محل قرارگیری چرخ‌دنده‌ها محصور شده و به سمت خروجی هدایت می‌شود.
مشخصات اصلی و مزایای پمپ دنده ای
این پمپ ها کوچک و ساده‌اند و اجزای متحرک اندکی دارند. و نمی‌توانند با فشار ایجاد شده توسط پمپ‌های اصطکاکی یا جریان سیال پمپ‌های سانتریفیوژ رقابت کنند ولی فشار ایجاد شده در این نوع پمپ بیشتر از پمپ‌های پره‌ای و گوشواره‌ای است. این پمپ به ویژه برای پمپاژ روغن و دیگر سیالات با ویسکوزیته بالا مناسب است.
از میان دو طرح موجود ، پمپ های خارجی قادر به ایجاد فشار بیشتر (تا ۳۰۰۰ پی اس آی) و شدت جریان بالاتر است چرا که شافت‌های قوی تر و تلرانس نزدیک‌تری دارد. پمپ ها ی داخلی توانایی مکش بهتری دارند و برای سیالات با ویسکوزیته بالا مناسب تراند. تعمیر و نگهداری پمپ داخلی مانند انواع خارجی بسیار آسان است.
از آنجایی که میزان جریان خروجی نسبت مستقیمی با سرعت چرخش چرخ دنده ها دارد، این پمپ ها معمولاً برای اندازه گیری و ترکیب سیالات به کار گرفته می‌شود. این پمپ ها برای جابجایی مواد خورنده یا آتش گیر نیز مورد استفاده قرار می‌گیرند.
گرچه معمولاً از آهن و فولاد ضد زنگ ریخته گری شده ساخته می شوند، به تازگی آلیاژهایی برای ساخت آنها به کار می رود که قادراند سیالات خورنده مانند اسید سولفوریک، سدیم هیپوکلریت، فریک کلرید و سدیم هیدروکسید را نیز جابجا کنند.
پمپ های خارجی را می‌توان در تجهیزات هیدرولیکی یافت که معمولاً در وسایل نقلیه، باسکول‌ها و تجهیزات سیار کاشت و برداشت به کار گرفته می‌شود. با برعکس کردن جهت حرکت پمپ ها با استفاده از روغنی که از جای دیگری از سیستم پمپاژ می شود می توان یک موتور هیدرولیک ایجاد کرد.
چنین موتوری به ویژه برای تأمین انرژی در مکان هایی کاربرد دارد که تجهیزات الکتریکی دست و پا گیر، پرهزینه و ناکارآمد است. به عنوان مثال تراکتورها به پمپ های خارجی وابسته اند که توسط موتور به گردش در‌می‌آید.
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