I. Specifications and parameters of submersible pump models
Submersible pump products are the most used pump products among pump products, and are also divided into submersible pump models according to their uses. Various submersible pumps.
The agricultural submersible pump products for farmland irrigation or fish pumping include QY submersible pump or QDX submersible pump. These two submersible pumps have complete models and parameters, and a wide range of flow and lift, which are suitable for agricultural pumps.
The fountain submersible pump product of the fountain landscape also belongs to the clear water submersible pump series. The difference between this product and the QY submersible pump is that this pump is a water immersion type instead of an oil immersion type. Irrigation can be used.
The deep well submersible pump used for deep well pumping also belongs to the clear water submersible pump product. Due to the special structure of the impeller pump, it cannot transport the liquid containing particulate impurities.
There are also WQ sewage pumps for sewage, sewage submersible pumps are mainly used for septic tanks, urban domestic sewage discharge, industrial sewage treatment and transportation, etc. In addition, such products can also be made into Sewage submersible pump model with mixing and cutting functions.
In addition, various stainless steel submersible pump products made of 304, 316, and 316L can also be used to transport food grade or stainless steel submersible pump products with corrosive media. The following introduces the models and parameters of several clean water submersible pumps.
1. QY submersible pump models and parameters:
2. How to select submersible pumps
The selection of submersible pumps first determines the use environment of the unit, such as farmland irrigation, garden watering, fountain landscape, rainwater recycling system, mine drainage, emergency rescue, urban drainage, and the use of groundwater sources by enterprises and institutions.
(1) List basic data
1. Characteristics of medium: medium name, specific gravity, viscosity, corrosiveness, toxicity, etc.
2. The particle diameter and content of the causative body contained in the medium.
3. Medium temperature: (℃)
4. Required flow rate
Generally, industrial pumps can ignore the leakage in the pipeline system in the process flow quantity, but the effect on flow rate of process changes must be considered. If agricultural pumps use open channels to transport water, leakage and evaporation must also be considered.
5. Pressure: suction pool pressure, drainage pool pressure, pressure drop (head loss) in the piping system.
6. Pipeline system data (pipe diameter, length, type and number of pipe accessories, geometric elevation from suction tank to pressure tank, etc.). If necessary, the device characteristic curve should also be drawn. When designing and arranging pipelines, the following items should be paid attention to:
a. Reasonably choose the diameter of the pipeline. The diameter of the pipeline is large. Under the same flow rate, the liquid flow velocity is small and the resistance loss is small, but the price is high and the diameter of the pipeline is small. , which will lead to a sharp increase in resistance loss, increase the head of the selected pump, increase the power of the belt, and increase the cost and operating expenses. Therefore, it should be comprehensively considered from the perspective of technology and economy.
b. The discharge pipe and its pipe joint should consider the maximum pressure it can bear.
c. The pipeline should be arranged as straight as possible, the accessories in the pipeline should be minimized and the length of the pipeline should be minimized. When it is necessary to turn, the bending radius of the elbow should be 3 to 5 of the diameter of the pipeline. times, and the angle should be greater than 90°C as much as possible.
d. Valves (ball valves or globe valves, etc.) and check valves must be installed on the discharge side of the pump. The valve is used to adjust the working point of the pump, and the check valve can prevent the pump from reversing when the liquid flows back and make the pump avoid the blow of water hammer. (When the liquid flows back, it will produce huge reverse pressure, which will damage the pump)
(2) Determine the flow head
Determine the flow
p>
a. If the minimum, normal and maximum flow have been given in the production process, the maximum flow should be considered.
b. If only normal flow is given in the production process, a certain margin should be considered. For ns>100 large flow and low head pump, the flow margin is 5%, and for ns
