china sand pump not working

China Custom Pump Parts Manufacturers Suppliers Factory - Pump Parts Process

Casing

A casing can be explained as a shell, cover or a housing which protects and supports most of the components. In pumps, the casing is basically used to seal it to prevent leakage and sometimes retain pressure. It is also used to support some of the key parts such as shafts, bearings, etc.

Impellers

An impeller is a rotating component in a centrifugal pump which is equipped with vanes or blades that rotate and moves the fluid in a pump. These vanes or blades are coupled to a shaft. When the impeller rotates, it converts the energy derived from a source i.e. motor to induce flow of the fluid. Impellers form an integral part of a pump since it creates velocity to the fluid through its blades/vanes. Impeller designs are considered as a major factor in deciding the efficiency of a pump. There are two types of impeller: Axial flow impeller and Radial flow impeller. In axial impeller, fluid moves axially to the shaft. In radial flow impeller, fluid moves perpendicularly to the shaft. Axial impellers are generally used for high flow and very low-pressure applications, whereas radial impellers are often used in multi-stage split case centrifugal pumps. Impellers are also categorized into open and closed impellers. An open impeller has only one shroud and the vanes are exposed on the other side. A closed impeller, often called a double shrouded impeller, has a shroud on both sides of the vanes. Open impellers are generally only used for single stage, end suction centrifugal pumps, whereas double shrouded impellers are used on side or top ported multistage centrifugal pumps. Impellers can also be classified on the basis of their suction type: In a single-suction impeller, liquid enters the centre of the blades from only one direction. Whereas, in a double-suction impeller liquid enters the center of the impeller blades from both sides simultaneously. Closed impellers are available in single suction or double suction impeller designs. Impellers in industrial grade centrifugal pumps are generally made of steel or stainless steel. Some lower grade pumps will have brass/bronze material or some sort of plastic. The material of the impeller should be considered carefully when purchasing a pump since impellers are exposed to a variety of corrosion, erosion, cavitation and general wear.

Mechanical Seals

Mechanical seals are used on the shafts of centrifugal pumps and screw pumps, where the input shafts have to exit the pressure chamber. It consists of two extremely smooth surfaces that are generally held together with springs or the pump age pressure. They can be relatively simple devices, but are generally highly engineered to fit a specific application, and can get notably complex. Elaborate seal support systems are often needed to cool, clean, and separate the fluid in and around the seal.

Mechanical seals and seal plans can be categorized into 4 main categories

Single Seals, Double Seals, Quench Seals and Gas Seals. Each category has distinct advantages and disadvantages and their design and features must be considered carefully in every pumping system. Mechanical seals are inherently troublesome because of their function of sealing a pressurized fluid around a rotating shaft. In ideal conditions, such as clean water or clean oil, mechanical seals can be made very reliable. In harsh environments like unclean fluid, extreme temperatures, high pressures, etc. elaborate seal systems need to be put in place and long seal life cannot be expected.

Bearings

A bearing is a component that helps reduce friction on moving parts in a pump. It supports the shaft to rotate smoothly. They are commonly used in pumps of all types, such as centrifugal, reciprocating, or rotary pumps.