Structural composition and schematic diagram of boiler pump dg multi-stage pump
Boiler pump dg multi-stage pump is suitable for medium and low pressure boiler feed water, and thermal power plant sub-high pressure boiler feed water. It is also suitable for high-lift water supply and drainage in factories and cities. It can be used to transport clean water or liquids with physical and chemical properties similar to clean water. The temperature of the transport medium is -20℃~160℃.
Boiler pump dg multi-stage pump structure composition:
The main parts of the boiler pump dg multi-stage pump are shaft, shaft sleeve, water inlet section, impeller, sealing ring, middle section, water outlet section, balance ring, balance plate, tail cover.
Schematic diagram of boiler pump dg multi-stage pump structure
Schematic diagram of boiler pump dg multi-stage pump structure
1. The inlet section, middle section, outlet section and tail cover are all made of cast iron, which together form the working chamber of the pump.
3. The shaft is made of high-quality carbon steel, with an impeller in the middle, and is fixed on the shaft with a key, a sleeve and a sleeve nut. One end of the shaft is fitted with a coupling part and directly connected with the motor. When viewed from the direction of rotation, the pump shaft rotates in the clockwise direction.
4. The sealing ring is made of cast iron to prevent the high-pressure water in the pump from leaking back into the water inlet part. They are respectively fixed in the inlet section and the middle section of the chemical pump. They are vulnerable parts and can be replaced with spare parts after wear.
5. The balance ring of the boiler feed water pump is made of cast iron and is fixed on the outlet section. It forms a balance device with the balance plate.
6. The balance plate is made of wear-resistant cast iron and is mounted on the shaft between the water outlet section and the tail cover to balance the axial force.
7. The boiler feed water pump shaft sleeve is made of ductile iron and is located at the two packing chambers. The centrifugal pump is used to fix the impeller and protect the pump shaft. It is a vulnerable part and can be replaced with spare parts after wear.
8. The bearing is a single-row radial ball bearing, which is lubricated with calcium base butter.
9. The packing serves as a seal to prevent air from entering and a large amount of liquid from leaking out. The packing seal is composed of the water inlet section and the packing chamber on the tail cover, packing gland, packing ring and packing, etc. A small amount of high-pressure water flows into the packing chamber to act as a water seal. The tightness of the packing must be appropriate, not too tight, not too loose, and the liquid can seep out drop by drop. If the packing is too tight, the sleeve will easily generate heat and consume power. If the packing is too loose, the efficiency of the pump will be reduced due to liquid loss.
