DG horizontal multi-stage feed pump boiler feed pump manufacturer

Description :

　　Product Overview:

　　The DG type pump series is a horizontal single suction multi-stage segmented centrifugal pump that can be used to transport clean water or liquids with physical and chemical properties similar to clean water. It is used for medium and low pressure boiler feed pumps and is also suitable for high-pressure water supply and drainage in factories or cities. The temperature of the conveying medium is -20 ° C to 150 ° C, and the allowable inlet pressure is less than 0.6 MPa.

　　This type of pump adopts the hydraulic model of high-efficiency energy-saving products recommended by the country. It has the advantages of high efficiency, wide performance range, safe and stable operation, low noise, long service life, and easy installation and maintenance.

　　Model Description:

　　Example: DG85-80 * 12

　　DG multi-stage boiler feedwater pump

　　85- The design point flow rate is 85m3/h

　　80- The single-stage lift designed is 80m

　　12 level is 12 level

　　Performance range:

　　Flow rate: Q=3.75-185m3/h

　　Head: H=50-684m (medium low pressure)

　　H=409-1450m (sub high pressure)

　　Structural features:

　　The inlet and outlet of the DG type pump are both vertically upward, and the pump casing parts such as the inlet section, middle section, outlet section, and bearing body are connected together by tightening bolts. Select the number of pump stages based on the head of the pump. The rotor part of this type of pump is mainly composed of a shaft and components such as impellers, shaft sleeves, and balance disks installed on the shaft. The number of impellers depends on the number of stages of the pump. The components on the shaft are fastened with flat keys and shaft nuts to integrate with the shaft. The entire rotor is supported by rolling bearings or sliding bearings at both ends. Bearings vary in model and do not bear axial forces, which are balanced by a balance plate. The pump allows the rotor to move axially in the pump casing during operation, without using radial ball bearings. Rolling bearings are lubricated with grease, sliding bearings are lubricated with thin oil, and self-lubricating with oil rings, cooled by circulating water.

　　The sealing surfaces between the inlet section, middle section, and outlet section of the pump are lubricated with molybdenum disulfide for sealing. A sealing ring, guide vane sleeve, etc. are installed between the rotor and the fixed part for sealing. When the wear of the sealing ring and guide vane sleeve has affected the working performance of the pump, they should be replaced.

　　There are two types of shaft seals: mechanical seals and packing seals. When the pump adopts packing sealing, the position of the packing ring should be placed correctly, and the tightness of the packing must be appropriate, so that the liquid can leak out drop by drop. The various sealing components of the pump are installed inside the sealing box, and a certain pressure of water should be introduced into the box to provide water sealing, cold water or water lubrication. A replaceable shaft sleeve is installed at the shaft seal to protect the pump shaft.

　　Sub high pressure pumps generally use sliding bearings and thin oil lubrication structures. DG85-67 DG155-67 pumps can use sliding bearings and thin oil lubrication, as well as rolling bearings and dry oil lubrication structures. Other models use rolling bearings and dry oil lubrication structures. The main component materials of medium and low pressure pumps are generally cast iron, while the main components of sub high pressure pumps are cast steel or stainless steel. This series of pumps is directly driven by the prime mover through an elastic coupling, and when viewed from the direction of the prime mover, the pump rotates clockwise. You can learn more about models such as DG85-45*2 DG85-45*3 DG85-45*3 DG85-45*4 DG85-45*5 DG85-45*6 DG85-45*7 DG85-45*8 DG85-45*9

AfterSalesService :

• feed pump