المعرفة الأساسية بالمضخات الكيميائية

How to choose the most suitable pump has always been something of great concern to people. It's never easy for you to choose a rightمضخة كيميائيةنظرًا لأن كل هذه العوامل مهمة: المناسبة، والوسائط، والمادة، وما إلى ذلك.

We have here the most detailed introduction of different types of pumps, so as to give you a clear impression of what kind of chemical pump you should choose.

لاختيار المضخة، يجب علينا أولاً فهم وإتقان مبادئ اختيار المضخة الكيميائية. 

1. نوع المضخة المختارة والأداء المتوافق مع الجهازالتدفق، الرأس، الضغط، درجة الحرارة، تدفق التجويف، الشفط ومعلمات العملية الأخرى.

2. يجب توضيح متطلبات خصائص الوسيلة.

On the transport of flammable, explosive toxic or expensive media pump, requires a reliable seal or the use of leak-free pumps, such asمضخة الدفع المغناطيسي,مضخة الحجاب الحاجز,مضخة الدرع.

3. نقل مضخة الوسائط المسببة للتآكل، والموثوقية الميكانيكية، وانخفاض الضوضاء والاهتزاز.

4. The economy should take into account the cost of equipment, operating costs, maintenance and management costs the lowest total cost.

5. المناسبات الشائعة، اختيار المضخة الكيميائية:

(1) مضخة طرد مركزيwith high speed, small size, light weight, high efficiency, large flow, simple structure, no pulsation of the infusion, stable performance, easy operation and easy maintenance and so on.

(2) هناك متطلبات القياس واختيار مضخة القياس.

(3) Head requirements are very high, the flow is small and no suitable small flow high-lift centrifugal motor pump can be used, the optional reciprocating pump, such as cavitation requirements are not high can also use vortex pump.

(4) الرأس منخفض جدًا، تدفق كبير، اختيار مضخة التدفق المحوري ومضخة التدفق المختلط.

(5) Medium viscosity (greater than 650 ~ 1000mm2 / s), consider the choice of rotor pump or reciprocating pump (gear pump, screw pump)

(6) محتوى الغاز المتوسط ​​75٪، معدل التدفق صغير واللزوجة أقل من 37.4 مم 2 / ثانية، اختيار مضخة الدوامة.

بداية متكررة أومضخة الريفي حالات الإزعاج، يجب استخدام أداء التمهيد الذاتي للمضخة، مثلمضخة طرد مركزي ذاتية التحضير,مضخة دوامة ذاتية التحضير، مضخة هوائية (كهربائية) مخصصة.

Seeking convection parts using corrosion-resistant material pump selection based on the process should be based on water supply and drainage requirements, from five aspects to be considered. 

1. Flow is one of the important performance data of the pump, it is directly related to the production capacity and transmission capacity of the whole device. Such as the Design Institute process design can calculate the pump normal, minimum, maximum three kinds of traffic. Select the pump, the maximum flow as the basis, taking into account the normal flow, in the absence of maximum flow, it is usually desirable 1.1 times the normal flow as the maximum flow.

2. Device system is required to lift the pump is another important performance data, the general use of amplification 5% -10% margin to head after selection.

3. Liquid properties, including liquid medium name, physical properties, chemical properties and other properties, which relates to the system head, effective NPS calculation and the appropriate type of pump, pump material selection and use that kind of shaft seal type .

4. The piping arrangement condition of the installation system refers to the height of the liquid feeding, the distance of the liquid sending, the minimum liquid level of the suction side, the maximum liquid level of the discharge side, etc., and the specifications, lengths, materials, And so on, in order to carry on the comb head calculation and the NPSH check.

5. Determination of operating conditions, such as liquid operating T saturated vapor pressure, suction side pressure (absolute), discharge side vessel pressure, altitude, ambient temperature operation is gap or continuous, whether the pump position is fixed or movable of. Are an important basis for selection. Materials such as AFB stainless steel corrosion-resistant pump, CQF engineering plastic magnetic drive pump.

For the transmission of solid particles containing the media, the use of convective components required wear-resistant materials, if necessary, shaft seal with a clean liquid rinse.

ترتيب خطوط الأنابيب للمضخات الكيميائية

في خط أنابيب تخطيط التصميم، يجب ملاحظة ما يلي:

A. Reasonable choice of pipe diameter, pipe diameter, at the same flow rate, the flow velocity is small, the resistance loss is small, but the price is high, the pipe diameter is small, will lead to a sharp increase in resistance loss, the pump head increases With the increase in power, costs and operating costs have increased. So should be considered from the technical and economic point of view.

ب. يجب أن يكون أنبوب العادم وتجهيزاته قادراً على تحمل أقصى قدر من الضغط.

C. pipe layout should be arranged as straight as possible to minimize the pipe fittings and to minimize the length of the pipe must be turned when the bending radius of the elbow pipe diameter should be 3 to 5 times the angle as much as possible more than 90 Lt; 0 & gt; C.

D. The discharge side of the pump must be equipped with valves (ball or globe valve, etc.) and check valve. The valve is used to adjust the operating point of the pump. The check valve prevents the pump from reversing when the liquid is backflow and prevents the pump from hitting the water hammer. (When the liquid backflow, it will have a huge reverse pressure, the pump damage).