پمپ های فشار بالایه سانتریفیوژ چند مرحله ایی بصورت سری عملیات تقویت فشار و وکیوم را انجام داده و یکی از پمپ ها با کاربرد فراوان در سیستم های سیرکولیتینگ تاسیسات خنک کاری , ابیاری قطره ایی و در کل کار با سیالات لو ویسکوزیته میباشد که بازده بالایی از نظر توان و دبی دارد
این پمپ ها رو حنما تو کارواش ها زیرات کردید که برای تولید فشار بالا ازشون استفاده میشه و جزو پمپ ها همچی حساس ایی روزگارن به به صورت خطی شارژ و دیشارژ میشه و هر دو دهانه ورودی و خروجی سوپاپ یکطرفه رو باید داشته باشند به اضافه یه رگلاتور و قطع کننده
symptomعلامت |
Possible Causes علل احتمالی |
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پمپ در بهترین حالت نیست |
Suction lift too great. Insufficient water at suction inlet. Suction inlet or strainer blocked. Suction line not air tight. Suction hose collapsed. Non return valve ball not seating. Mechanical seal / packing drawing air into pump Ejector jet or nozzle blocked or badly worn. Ejector non-return valve ball stuck. Separation tank cover blocked. Compressor pipe leaking air. Compressor not delivering sufficient air. Compressor belt drive faulty. |
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دیس شارژ کامل صورت نمیگیرد |
Incorrect engine speed. Discharge head too high. Suction lift too great. Suction inlet or strainer blocked. Suction line not air tight. Suction hose collapsed. Mechanical seal drawing air into pump. Obstruction in pump casing/impeller. Impeller excessively worn. Delivery hose punctured or blocked. |
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توقف دیس شارژ بعد از چند لحظه |
Suction lift too great. Insufficient water at suction inlet. Suction inlet or strainer blocked. Suction hose collapsed. Excessive air leak in suction line. Mechanical seal / packing drawing air into pump Obstruction in pump casing/impeller. Delivery hose punctured or blocked. |
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پمپ توان زیادی میکشد |
Engine speed too high. Obstruction between impeller and casing. Viscosity and / or SG of liquid being pumped too high. |
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لرزش شدید پمپ یا افزایش حرارت |
Engine speed too high. Obstruction in pump casing/impeller. Impeller damaged. Cavitation due to excessive suction lift. |
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نشت در محل ابندی یا هوزینگ ها |
Mechanical seal damaged or worn. |
When operating pumps in parallel or in a series, there are more complex issues to consider.
Series applications: consider the pressure rating of pump, shaft seal, pipework and fittings. Placement is critical to ensure both pumps are operating within their recommended range and will have a constant supply of water. Drawing a curve for 2 or more pumps is simple, draw 1st pump curve then draw 2nd curve, adding the head each pump produces at the same flow. More curves can be added in the same way.
Parallel applications: confirm suitability of pumps by drawing a system curve (often 2 pumps will only deliver slightly more than one pump due to excessive friction loss. Also you can confirm that pump operation will be within its recommended range.). Non return valves are required especially if one pump operates alone at times.Dissimilar pumps or pumps placed at different heights requires special investigation. Drawing a curve for 2 or more pumps is simple, draw 1st pump curve then draw 2nd curve, adding the flows each pump delivers at the same head. More curves can be added in the same way.
Find details of duty. In the above example: Water, 2m suction lift, 15m static discharge (17m total static head), 360 meters of 150mm schedule 40 steel pipe.
Draw a chart with flow on bottom scale and head on left scale. Estimate scale required based on size of existing pump, or guess maximum flow expected - example shows max flow as 100 L/S and max head as75m - sometimes you just have to guess to get started.
Mark static head. 17m at zero flow. Note: 'Demand' pressure, ie: sprinklers etc, should be added at each flow point, or for approximate figures can be added to static head.
Mark 2 or 3 other points. At 20L/S friction loss is 0.73 m / 100m of pipe, therefore 0.73 x 3.6 + 17 = 19.6 meters. Put mark at junction of 20 L/S and 19.6 m. Repeat for other points. Remember to add static head each time.
Join these points with a line.
You have completed the System Curve. The Curve may have to be extended to suit higher flow pumps.
The pump operating point is where a pump curve crosses the system curve. Draw as many pump curves over the system curve as you like, to see where different pumps will operate, or draw system curve over pump curve.
If pump curve does not cross system curve, the pump is not suitable.
If the pump curve crosses the system curve twice, then the pump will be unstable and is not suitable.
