D horizontal centrifugal pump outlet

Description :

　　Introduction to Multi stage Wear resistant Mining Pump Products

　　The D-type wear-resistant multi-stage centrifugal pump is highly efficient, energy-saving, wear-resistant and reliable, with a long service life. It is particularly suitable for mine drainage, pumping mine water and other similar liquids with a volume concentration of solid particles not exceeding 1.5% (particle diameter less than 0.5mm), and liquid temperature not exceeding 80 ℃.

　　What work does the water pump (regardless of the model, as long as the imported size is the same as shown in Figure 1) do during the process of pumping water from the suction well to the sedimentation well? To increase the water head to a height of 13.5 meters, which is 2.3+2.7+8.5. This height is caused by the height difference of the terrain, and we call it the terrain lift. Secondly, it is necessary to overcome resistance in all pipelines. By calculation, the total resistance of the pipeline from the Dg500 × 250 reducer pipe of the water pump outlet to the inlet of the sedimentation tank is 6.7m, and the total resistance of the pipeline from the bottom valve of the water pump suction pipe to the Dg50 × 250 reducer pipe on the outlet pipe is 2.1m, totaling 8.8 meters, which is close to 9 meters. The resistance of 9 meters actually refers to raising water by 9 meters, which we call the resistance lift. Thirdly, before the water flows into the sedimentation tank, there must be a pressure requirement at the outlet of the pipeline. Because when the water flows to the outlet of the Dg250 pipeline, the pressure provided by the two heads above has already been exhausted. In order to allow the water to flow out, a certain amount of pressure is required, so an additional 2-5 meters of head is needed. In addition, when the end of the pipeline is directly connected to some equipment, there is also a requirement for the working pressure of the equipment. We can summarize the additional pressure requirements at the end of the pipeline as equipment head.

　　Design principle of multi-stage pump for D wear-resistant mining

　　The existing multi-stage centrifugal pumps generally adopt a one-dimensional theoretical design for conveying clean water. Our company's wear-resistant multi-stage centrifugal pump for coal mines pumps coal water containing solid particles. We have added two-phase flow design theory to improve the suction performance and hydraulic design of the pump, which increases the suction head of the pump, reduces the impact wear of coal water in the pump, and effectively converts energy, thereby improving the efficiency of the pump and extending its service life.

　　Product characteristics of D wear-resistant multi-stage pump for mining

　　The wear-resistant multi-stage centrifugal pump is a segmented horizontal multi-stage pump, with a horizontal suction port and a vertical upward discharge port. The water pump is directly driven by the prime mover through a coupling. From the perspective of the prime mover, the pump rotates clockwise. The MD type pump is mainly composed of four parts: stator, rotor, bearing, and shaft seal

　　1. The stator part is mainly composed of suction section, middle section, discharge section, guide vanes, etc., which are clamped by tightening bolts to form a working chamber.

　　2. The rotor part is mainly composed of a shaft, impeller, balance disk, and shaft sleeve. The shaft transmits power to the impeller to make it work; Balance discs are used to balance axial forces; The two ends of the shaft are equipped with replaceable shaft sleeves to protect the shaft.

　　3. There are two types of bearings: rolling bearings and sliding bearings. Rolling bearings are mainly composed of bearing bodies, bearings, and bearing covers, and are lubricated with grease. Sliding bearings are mainly composed of bearing bodies, bearing covers, bearing shells, dust-proof disks, oil level gauges, oil slingers, etc., and are lubricated with thin oil. zmjt05

　　4. The shaft seal adopts a packing seal, mainly composed of the sealing box body, packing, and water blocking ring on the inlet section and packing box body. The liquid inside the sealed studio serves as a water seal, water cooling, and water lubrication. The water seal water comes from the pressure water inside the pump

　　The total head of the water pump=terrain head+resistance head+equipment head If we take the head of the equipment at the outlet of the pipeline as 2 meters and substitute it into the above equation, then the total head of the water pump is 13.5+9+2=24.5 meters, which means that the water pump must raise the water level from the suction well by 24.5 meters to leave 400 tons of water per hour. From the above discussion, it can be seen that terrain lift and equipment lift do not vary with changes in pipeline flow rate, but resistance lift varies with changes in flow rate. If the flow rate is greater than 800 tons/hour, the resistance head will be greater than 9 meters. If the flow rate is less than 800 tons/hour, the resistance head will become less than 9 meters.

　　Working principle of D wear-resistant multi-stage pump for mining

　　The impeller is driven to rotate by an electric motor through a column pin coupling direct coupled pump. The blades in the impeller force the liquid to rotate, doing work on the liquid and increasing its energy. Under the action of centrifugal force, the liquid is thrown out around the impeller, and the velocity energy is converted into pressure energy through the guide vane channel. Collect the liquid through the guide vanes and flow it into the next stage impeller, repeating the above impeller working process. When the liquid inside the first stage impeller is thrown out, the pressure inside the inlet of the first stage impeller is lower than the pressure inside the inlet pipe. Under the action of this pressure difference, new liquid is sucked into the first stage impeller, and the liquid continuously flows out of the pump.

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