Structure and characteristics of single-stage centrifugal pump
The structure of a single-stage centrifugal pump:
1. Main components of single-stage centrifugal pump: pump casing The pump casing has two types: axial split type and radial agent type. Most single-stage centrifugal pumps have a volute housing, and the multi-stage centrifugal pump has a radially split housing that is generally an annular housing or a circular housing. Generally, the inner cavity of the volute type pump casing is a spiral flow path. Used to collect the liquid flowing out of the impeller and lead it to the diffuser to the pump outlet. The pump casing is subjected to the full working pressure and the thermal load of the liquid.
2, the main components of a single-stage centrifugal pump: impeller The impeller is the only work component, the pump works on the liquid through the impeller. The structure of the impeller is closed, open and semi-open. The closed impeller consists of a blade, a front cover and a rear cover. The semi-open impeller consists of a blade and a rear cover. The open impeller has only vanes and no front and rear covers. The closed impeller is more efficient and the open impeller is less efficient.
3, the main components of the single-stage centrifugal pump: the sealing ring The role of the sealing ring is to prevent the internal leakage and external leakage of the pump. The sealing ring made of wear-resistant material is set on the front and rear cover plates and the pump casing of the impeller. It can be replaced after wear.
4. Main components of single-stage centrifugal pump: shaft and bearing The pump shaft is fixed at one end and the coupling is installed at one end. According to the size of the pump, the bearing town uses rolling bearings and sliding bearings.
5, the main components of a single-stage centrifugal pump: shaft seal Shaft seal generally has two kinds of mechanical seal and packing seal. Generally, the pumps are provided with juice to be filled with a packing seal and a mechanical seal.
Single-stage centrifugal pump features:
1. High efficiency and energy saving: CFD calculation fluid dynamics is used to analyze and calculate the relationship between pressure distribution and velocity distribution in the pump, optimize the flow channel design of the pump, ensure that the pump has high-efficiency hydraulic line, and improve the efficiency of the pump.
2, installation, maintenance is convenient: vertical pipeline structure, the pump's import and export can be installed in any position and any direction of the pipeline like a valve, installation and maintenance is very convenient.
3. Smooth operation, safe and reliable: the motor shaft and the pump shaft are coaxial and directly connected, with high concentricity, stable operation, safe and reliable.
4. Stainless steel bushing: The sealing position of the shaft is relatively easy to be rusted. Once the direct-coupled pump shaft is rusted, it is easy to cause mechanical seal failure. The STG pump is equipped with a stainless steel bushing to prevent rust, improve shaft life and reduce operating and maintenance costs.
5. Bearing: In the motor equipped with the pump, the Y[Y2]280 below the shaft extension end bearing (including the Y180 lower blade end bearing) adopts the closed type bearing. When it is used normally, the maintenance of the motor bearing is avoided.
6. Machine seal: The mechanical seal base is generally made of rubber bellows structure. The seal on the shaft of the traditional mechanical seal is changed from the line seal of the O-ring to the two-face seal of the rubber part, which improves the sealing effect in the clear water medium.
