What are the core accessories of chemical corrosion-resistant pumps?

What are the core accessories of chemical corrosion-resistant pumps?
Chemical anti-corrosion pumps are generally used in pumps that transport corrosive liquids. Due to the particularity of the medium, the requirements for the selection of materials for anti-corrosion pumps are also very strict. Function, then what are the overcurrent components of the pump, and what components are they referring to?
1. What are the overcurrent components of the pump?
Many people who are ignorant of chemical anti-corrosion pump products want to know what are the primary flow components of the water pump. In fact, we take the commonly used centrifugal pumps as an example. Centrifugal pumps are classified as vane pumps. The flow components of vane pumps are mainly impellers. , pump cavity, suction chamber, pump cover, seal, pressurized water chamber, pump shaft and other major components.
Second, the structure method of water pump impeller and blade
The number of semi-open and open impeller blades is less, generally 2~5 pieces, and most of them are used for pumping slurry granular liquid or sewage, such as the impeller of sewage pump. In the field of sewage discharge, in order to ensure that the medium containing solid particles, fibers and other surrounding objects is blocked when conveying, channel-type impellers are often used. The material of the impeller of the water pump must have sufficient mechanical strength, and must have certain wear resistance and corrosion resistance. According to the requirements of the transport medium, cast iron, cast steel, stainless steel or, for example, oil pump products are generally used to transport flammable and explosive oil impellers made of bronze materials.
4. Water pump suction chamber, pump chamber, water pump pressure chamber
1. The pump cavity and the water suction chamber of the pump are located in front of the impeller, and their function is to guide the liquid to the impeller. The pump cavity is also an important position for the liquid to circulate and output in the pump.
2. The pressurized water chamber is located on the periphery of the impeller, sometimes called the pump body. Its function is to collect the liquid flowing out of the impeller, convert most of the kinetic energy into pressure energy, and then send it into the discharge pipe,
3. The materials of the water absorption chamber and the pressurized water chamber should have sufficient mechanical strength, wear resistance and corrosion resistance, and cast iron, cast steel and stainless steel are generally used. The anti-corrosion pump has outer cast steel lined with fluorine plastic and so on.
5. Pump cover. seal
The pump cover is the primary component for fixing the impeller and the seal. The impeller rotates to prevent liquid leakage through the seal. When the liquid overflows, the pump cover is the part that directly touches the liquid.
3. The role of water pump impeller and the type of impeller
The pump impeller is an important working part of the pump, and its shape, size, and processing technology have a decisive impact on the pump performance. The function of the pump impeller is to transfer the energy input by the prime mover to the liquid. The shape and size of the pump impeller are closely related to the performance of the pump. Pump impellers can generally be divided into single-suction and double-suction. Single-suction impellers absorb water on one side, and small-flow pump impellers mostly use this method. The double-suction impeller absorbs water at both ends, and the impeller of the large-flow water pump adopts the double-suction impeller.
There are mainly three structural methods for the impeller of the water pump: the one with front and rear cover plates is called a closed impeller. Only the rear cover is called a semi-open impeller. An impeller without front and rear covers is called an open impeller. Other blade structure methods can also be divided into two types: cylindrical blades and twisted blades. The blades of the centrifugal pump impeller are generally backward curved blades. There are two types of blades: cylindrical and twisted. The use of twisted blades can reduce the load of the blades, improve the suction performance of the centrifugal pump, and improve the anti-cavitation ability, but the manufacturing is difficult and the cost is high. Pump impeller The centrifugal pump for oil refining and chemical industry requires the impeller to be the whole pump impeller that is cast or fully welded. Welded pump impellers are developed in recent years, and are mostly used for casting metal materials with poor performance, such as iron and its alloys, to manufacture special centrifugal pumps for chemical industry. The geometric accuracy and surface finish of the welded pump impeller are better than the cast impeller, which is beneficial to the power of the forward centrifugal pump. Generally, the closed-type water pump impeller has 2-12 backward curved blades, which has high operating power. For example, the aforementioned single-suction and double-suction centrifugal pumps use this impeller. In the meantime, the impeller of the single-stage single-suction centrifugal pump has an axial force, so some impellers have a balance hole at the root of the blade.