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DG medium and low pressure, sub high pressure series multistage boiler feed pump
Flow range: 3.75 ~ 185m³ / h
Caliber range: 40-150mm
Power range: 3-450KW
Temperature range: -20 ℃ ~ 150 ℃
This DG series boiler pump is a single-suction multi-stage segmented centrifugal pump, which can transport clear water or a liquid with physical and chemical properties similar to clear water. drain. The temperature of the conveying medium is -20 ℃ ~ 150 ℃, and the allowable pressure at the inlet is less than 0.6MPa.
This series of pumps adopts the nationally recommended water-saving model of high-efficiency and energy-saving products. It has the characteristics of high efficiency, wide performance range, safe and stable operation, low noise, long life, convenient installation and maintenance, etc. The efficiency is on average 8% higher than the DC type.
Our company has passed ISO9001: 2000 quality system certification. The product design, production and service have a strict and standardized control system, and the product quality is fully guaranteed.
Conditions of Use:
DG boiler feed water pump is suitable for small boiler water supply and urban water supply.
Structural characteristics and working principle:
The inlet and outlet of the DG pump are vertically upwards. The pump's water inlet, middle, water outlet, bearing body and other pump housing parts are connected into one body by tightening the bolts. The number of pump stages is selected according to the pump's head.
This series of pump rotor part is mainly composed of shaft and impeller, shaft sleeve, balance plate and other parts installed on the shaft. The number of impellers depends on the number of pump stages. The parts on the shaft are fastened with a flat key and a shaft nut to make them integrated with the shaft. The entire rotor is supported by rolling bearings or sliding bearings at both ends. The bearings vary according to the model, and they do not bear axial force. The axial force is balanced by the balance disk. The pump is allowed to move axially in the pump casing during operation. Uses radial ball bearings. Rolling bearings are lubricated with grease, sliding bearings are lubricated with thin oil, self-lubricating with oil rings, and circulating water cooling.
The sealing surfaces between the inlet, middle and outlet sections of the pump are sealed with molybdenum disulfide grease. A seal ring and a guide vane sleeve are installed between the rotor part and the fixed part for sealing. The degree of wear has affected the new function of the pump and should be replaced.
There are two types of shaft seals: mechanical seals and packing seals. When the DG pump is sealed with a packing, the position of the packing ring must be placed correctly, and the tightness of the packing must be appropriate. It is advisable that the liquid can seep drop by drop. Various sealing elements of the pump are installed in the sealed cavity, and water with a certain pressure must be passed into the cavity to serve as water seal, water cooling 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 and DG155-67 pumps can use sliding bearings, thin oil lubrication, and rolling bearings, dry oil lubrication structures. The other models use rolling bearings, dry oil lubrication. structure. The main parts of medium and low pressure pumps are generally made of high quality cast iron, and the main parts of sub high pressure pumps are made of cast steel or stainless steel. This series of pumps are directly driven by the prime mover through an elastic coupling. From the direction of the prime mover, the pump rotates clockwise.