Release time：Apr,17,2026 
Chemical corrosion-resistant pumps are typically used to transport corrosive liquids. Due to the special nature of the medium, the material selection requirements for corrosion-resistant pumps are also very strict. The flow-through parts of the corrosion-resistant pump all come into contact with the liquid, so they must have excellent corrosion resistance. So, what components are included in the flow-through parts of the pump? What parts are they referring to?
Which parts of a water pump are considered the flow-through components?
Many people who are not familiar with chemical anti-corrosion pump products are very curious about the main flow-through components of water pumps. In fact, taking the commonly used centrifugal pump as an example, the centrifugal pump belongs to the impeller pump. The main flow-through components of impeller pumps include the impeller, pump cavity, suction chamber, pump cover, seal, pressure chamber, pump shaft and other major components.
II. Structural Forms of Pump Impellers and Blades
Semi-open and open impellers have fewer blades, usually 2 to 5, and are mostly used for pumping slurry or sewage, such as the impellers of sewage pumps. In the field of sewage discharge, to ensure that there is no blockage when transporting media containing solid particles, fibers and other entanglements, flow-through impellers are often used. The material of the pump impeller should have sufficient mechanical strength and certain wear resistance and corrosion resistance. According to the requirements of the transported medium, cast iron, cast steel, stainless steel or materials such as bronze are currently commonly used, for example, the impellers of oil pumps used for transporting flammable and explosive oils are all made of bronze.
IV. Pump suction chamber, pump cavity, pump pressure chamber
The pump chamber and the water suction chamber of the water pump are located in front of the impeller. Their function is to guide the liquid towards the impeller. The pump chamber is also an important position for the circulation and output of the liquid within the pump.
2. The volute, located around the impeller, is sometimes also called the pump casing. Its function is to collect the liquid flowing out of the impeller, convert most of the kinetic energy into pressure energy, and then deliver it to the discharge pipe.
3. The materials of the suction chamber and the pressure chamber should have sufficient mechanical strength, wear resistance and corrosion resistance. Generally, cast iron, cast steel and stainless steel are used for casting. For anti-corrosion pumps, there are outer cast steel and inner fluoroplastic lining, etc.
V. Pump Cover. Sealing
The pump cover is the main component for fixing the impeller and the seal. When the impeller rotates, the seal prevents the leakage of the liquid. During the flow of the liquid, the pump cover is the part that comes into direct contact with the liquid.
III. The Function of Pump Impellers and Types of Impellers
The impeller of a water pump is a crucial working component, and its shape, size, and processing technology have a decisive impact on the pump's performance. The function of the water pump impeller is to transfer the energy input by the prime mover to the liquid. The shape and size of the water pump impeller are closely related to the pump's performance. Water pump impellers are generally divided into single-suction and double-suction types. Single-suction impellers draw water from one side and are mostly used in small-flow water pumps. Double-suction impellers draw water from both sides and are all used in large-flow water pumps.
There are mainly three structural forms of pump impellers: those with both front and rear covers are called closed impellers. Those with only a rear cover are called semi-open impellers. Those without front or rear covers are called open impellers. Additionally, the structural forms of the blades can be divided into cylindrical blades and twisted blades. The blades of the impellers in centrifugal pumps are generally of the backward-curved type. The blades can be either cylindrical or twisted. The application of twisted blades can reduce the load on the blades, improve the suction performance of the centrifugal pump, and enhance its cavitation resistance, but they are more difficult to manufacture and cost more. For centrifugal pumps used in oil refining and chemical industries, the impellers are required to be cast or fully welded integral impellers. Welded impellers have developed in recent years and are mostly used for special chemical pumps made of metals with poor casting properties, such as iron and its alloys. The geometric accuracy and surface finish of welded impellers are superior to those of cast impellers, which is beneficial for improving the efficiency of the centrifugal pump. Generally, closed impellers have 2 to 12 backward-curved blades and have relatively high operating efficiency. For instance, the aforementioned single-suction and double-suction centrifugal pumps use this type of impeller. Among them, the impellers of single-stage single-suction centrifugal pumps have axial forces, so some impellers have balance holes at the root of the blades.