Pump Casing
Pump casing is the outer shell of the pump, which is used to accommodate the various components of the pump, such as the impeller, pump shaft, etc.
Pump Casing Function
Obviously, the pump casing is the outer shell of the pump, which can be understood as the container of the pump. It is used to accommodate the key components of the pump (impeller, pump shaft, sealing device, etc.), to fix the position of the pump components, and to maintain stability.
As a hard outer shell of the pump, the case can support the entire pump structure and protect the pump components from external damage. The pump case is the cornerstone of the pump’s ability to withstand the impact of high-speed fluids.
The sealed design of the casing can ensure that the liquid in the pump will not leak and play a certain sealing role.
The design of the casing is the fundamental reason for the flow direction of the liquid in the pump. The shape of the case determines how the liquid flows in the pump and can guide the fluid to the outlet position.
Pump Casing Material
There are many materials for making pump casing. The selection of materials should be based on the nature of the medium to be transported, the working environment, pressure and other factors.
Commonly used materials include ductile iron, high chromium alloy, stainless steel and other composite materials.
- If you need to transport ordinary media, such as water or clean liquids, it is more economical to choose cast iron or stainless steel.
- For processing corrosive or high-temperature and high-pressure fluids, stainless steel and high-chromium alloy are more suitable.
- If the medium to be processed contains a large number of solid particles or sharp objects, high-chromium alloy with the highest abrasion resistance is the best choice.
- Composite materials are lightweight options. If your pump requires a small volume, then please choose composite materials, such as peristaltic pumps.
In any case, only by choosing the right material can the pump achieve the best efficiency and thus achieve a longer service life.
Types of Casing in Centrifugal Pump
There are many types of centrifugal pump casings, each with different characteristics and suitable for different working conditions.
Centrifugal pump casings mainly include volute casing, diffuser casing, and split case pump. I will split each type of pump case and analyze them from their respective advantages, disadvantages and applications. Please read the following content.
Volute Casing
Volute casing is a unique design, similar to a spiral volute. The function of volute casing is to guide the discharge of fluid. The spiral design is more in line with the fluid flow and improves the efficiency of pump casing drainage.
Through the high-speed rotation of the impeller, water is thrown to the volute casing. The spiral design of the flow channel can gradually reduce the speed of the fluid and gradually increase the pressure of the fluid, converting the speed energy of the fluid into pressure energy and guiding the fluid to be discharged from the outlet.
There are two types of volute casing, Single volute casing, Double volute casing, which will be explained in detail below.
Single Volute Casing
Advantages: Single Volute Casing is a single shell design. This design of volute casing is simple to cast, low in production cost, has a larger opening, and is easy to maintain.
Disadvantages: The single shell design is not conducive to high pressure and harsh environments.
Application: Single volute pump casing is widely used in centrifugal pumps and is suitable for handling fluids with low to medium flow and pressure.
Double Volute Casing
Advantages: Double Volute Casing adopts a double shell design, which can effectively reduce radial loads and reduce the bearing pressure of the pump shaft, making it more solid and stable, able to withstand the impact of higher pressure fluids, and having a longer service life.
Disadvantages: Casting is more difficult, and compared with single volute pump casing, the production cost is higher and the cost of use is high.
Application: Double volute casing is suitable for high pressure, large flow and more severe use environments. It can withstand the impact of high-speed fluids and can also transport slurry containing solid particles.
Diffuser Casing
Diffuser casing in centrifugal pump is very common and is mostly used as a high-pressure multi-stage pump. In a series of diffusers, the flow channel gradually widens.
When the fluid flows in the pump, under the action of the multi-stage diffuser, the velocity of the fluid continues to decrease and the pressure of the fluid gradually increases.
Diffuser Pump Casing
Advantages: Compared with other pump casings, Diffuser casing has a multi-stage pressurization function, which makes it more efficient and can provide higher pressure, good stability, and less maintenance.
Disadvantages: Diffuser casing has a complex structure, high manufacturing cost, and a limited range of use. Because there are a series of diffusers in the pump, the volume and weight are relatively large.
Application: Diffuser casing is mostly used in high-pressure multi-stage pumps to handle high-pressure fluids. It can also be used in the chemical, petroleum, and natural gas industries to output high-pressure fluids.
Split Case Pump
The pump casing of the split case pump is divided into two parts, usually composed of an upper casing and a lower casing. The split casing is more convenient to install and maintain.
Split Case Pump
Advantages: The split case pump with upper and lower structures is more convenient to install, and maintenance only requires the removal of the upper pump casing, which makes the split case pump have a longer service life.
Disadvantages: The split case pump is heavy and large in size, and requires high-precision casting technology to ensure the sealing and stability between the pump casings.
Application: The split casing is suitable for large pumps, used in urban water supply, fire water supply, water treatment plants, etc.
Pump Casing Technology
Kingda pump casings are designed with advanced hydraulics to effectively reduce hydraulic losses and improve fluid movement efficiency.
Based on advanced analysis software such as Gambit and Fluent, the most efficient casing is designed according to hydraulic performance, wear characteristics, fluid boundaries and other conditions under different conveying conditions.
Kingda uses casting simulation CAE technology to accurately simulate and calculate the filling analysis, solidification analysis and stress analysis of casing castings, so that the quality and service life of pump casing can reach the best state.
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