D46-30 * 4 Horizontal Multistage Centrifugal Pump Model and Material Description

Description :

　　I. Overview

　　The D-type pump is a single suction multi-stage, segmented centrifugal water pump suitable for water supply and drainage in mines, factories, and cities. For conveying water that does not contain solid particles or abrasives, suspended solids, or other liquids with physical and chemical properties similar to water. The temperature of the transported liquid is between -20 ℃ and 8 ℃. The MD type single suction multi-stage wear-resistant pump is made by changing the material based on the original D-type pump. This pump is suitable for neutral mineral water with a solid particle content of no more than 1.5% (particle size less than 0.5 mm) and similar other sewage. The temperature of the conveyed medium is not higher than 80 ℃, and it is suitable for steel plants, mine drainage, sewage transportation and other occasions. Its performance parameters and external installation dimensions are the same as those of a D-type pump,

　　2、 Model Material Description

　　150D (MD)30 ×5

　　Model: D-multi-stage, segmented centrifugal water pump

　　MD multi-stage wear-resistant pump

　　150- Pump suction diameter (e.g. m)

　　30- Single stage lift of 30 meters

　　31-5- The pump stage is 5 stages

　　Material List:

　　If users have special requirements for the material of wear-resistant pumps, they can negotiate with the manufacturer.

　　3、 Structural description

　　The pump housing is mainly composed of bearing body, front section, middle section, rear section, guide vanes, etc., which are connected as a whole by bolts. The centerline of the front suction inlet is horizontal, and the centerline of the rear discharge outlet is perpendicular to the horizontal.

　　2. Rotor section

　　The rotor part is mainly composed of a shaft and components such as impellers, shaft sleeves, and balance disks installed on the shaft. The components on the shaft are fastened with flat keys and shaft sleeve nuts to integrate with the shaft. The entire rotor is supported on the pump housing by bearings at both ends, and the number of impellers in the rotor section depends on the number of stages of the pump.

　　3. Bearing section

　　This type of pump has two types of bearings: sliding bearings and rolling bearings, depending on the model, both of which do not bear axial forces. The pump should allow the rotor part to move axially in the pump housing during operation, and radial ball bearings should not be used. The bearings used in various types of pumps are shown in the table

　　4. Sealing of the pump

　　The sealing surfaces between the front, middle, and rear sections of the pump are sealed with one pound key lubricating grease. The rotor and fixed parts are sealed with sealing rings, guide vane sleeves, packing, etc. When the wear of the sealing rings and guide vane sleeves has affected the operation and performance of the pump, they should be updated in a timely manner

　　When using this type of pump, the position of the packing ring should be placed correctly. The distribution of the packing and packing ring for each type of ammonia is shown in Table 2. The tightness of the packing must be appropriate, so that the liquid can leak out drop by drop (8-10 drops/minute is recommended).

　　5. Balance mechanism

　　The balancing mechanism consists of a balancing ring, a balancing sleeve, a balancing disk, etc. The balancing mechanism is used to balance the axial force of the pump.

　　4、 Assembly and disassembly of pumps

　　1. Pump assembly

　　The quality of the assembly of this type of pump directly affects whether the pump can operate normally, and affects the service life and performance parameters of the pump; The vibration and noise that affect the unit should be noted during assembly, including the following points:;

　　a、 The concentricity of the fixed parts after assembly is ensured by the manufacturing accuracy and assembly quality of the parts. The machining accuracy and surface roughness of the parts should be guaranteed, and collisions or scratches are not allowed. Molybdenum disulfide used as sealant should be clean. The screws and bolts used for fastening should be evenly stressed. b、 The alignment between the impeller outlet channel and the guide vane inlet channel is ensured by the axial dimensions of each component. The quality of the neutral flow channel directly affects the performance of the pump, so the size of the pump cannot be adjusted arbitrarily.

　　c、 After the pump assembly is completed and before packing is installed, rotate the pump rotor by hand to check whether the rotor rotates flexibly inside the housing and whether the axial movement meets the specified requirements.

　　d、 After the above inspection meets the requirements, add packing to the shaft seals at both ends of the pump, paying attention to the relative position of the packing ring in the packing chamber. 2. Disassembly of pump

　　a、 Disassembly should be carried out in the reverse order of assembly, and the manufacturing accuracy of the parts should be strictly protected from damage during disassembly. B、 When disassembling the through rod, each middle section should be cushioned to prevent loosening and sinking of the middle section joints, which may cause the shaft to bend.

　　5、 Pump installation

AfterSalesService :

• Horizontal multi-stage centrifugal pump