The Submersible Pump Is Used in Conjunction With The Centrifugal Pump.

The submersible pump placed underwater, and the centrifugal pump placed on the ground, the size of these should be the pipe diameter they are connected with. The characteristics of the submersible pump are a very versatile water treatment tool. Different from ordinary pumps, it works underwater, while most pumps work on the ground. Before starting the pump, the suction pipe and the pump must be filled with liquid. After starting the pump, the impeller rotates at high speed, and the liquid inside rotates along with the blades. Under the action of centrifugal force, it flies away from the impeller and is ejected outward. The ejected liquid gradually slows down in the diffusion chamber of the pump casing and gradually increases in pressure, and then flows out from the pump outlet and the discharge pipe. At this time, due to the liquid being flung to the surrounding area, a vacuum low-pressure area without air or liquid is formed at the center of the impeller. Under the action of the atmospheric pressure of the liquid pool, the liquid in the pool flows into the pump through the suction pipe. The liquid is continuously sucked up from the liquid pool and continuously flows out through the discharge pipe. The characteristics of the submersible pump include flow rate, head, pump speed, matching power, rated current, efficiency, pipe diameter, etc. The main uses and application scope of the centrifugal pump include construction site drainage, water agriculture irrigation and drainage, industrial water circulation, urban and rural water supply, even emergency rescue and disaster relief, etc. The centrifugal pump has many characteristics. From the usage perspective, it can be divided into civilian and industrial pumps. From the medium it transports, it can be divided into clear water pumps, impurity pumps, corrosion-resistant pumps, etc. The basic structure of the centrifugal pump consists of six parts: impeller, pump body, pump shaft, bearing, sealing ring, and stuffing box. The impeller is the core part of the centrifugal pump. It has a higher rotational speed and greater power. The blades on the impeller play a main role. The impeller must undergo static balance tests before assembly. The inner and outer surfaces of the impeller must be smooth to reduce friction loss of the water flow. The pump body is also called the pump casing, which is the main body of the pump. It supports and fixes the pump and is connected to the bracket for installing the bearing. The function of the pump shaft is to connect the pump shaft with the motor through a coupling, transmitting the torque from the motor to the impeller, so it is the main component that transmits mechanical energy. The bearing is a component that supports the pump shaft and is mounted on the pump shaft. There are two types of bearings: rolling bearings and sliding bearings. Rolling bearings use butter as the lubricant and should be added appropriately, generally 2/3 to 3/4 of the volume. Too much will cause overheating, and too little will cause noise and overheating! Sliding bearings use transparent oil as the lubricant. The oil level line should be added. Too much oil will seep out along the pump shaft and float, and too little will cause the bearing to overheat and burn, resulting in an accident! During the operation of the pump, the temperature of the bearing is the highest at 85 degrees. Generally, it operates at around 60 degrees. If it is too high, the cause should be investigated (whether there are impurities, whether the oil quality is black, whether water is in), and it should be dealt with in time! The sealing ring is also called the leakage reduction ring. The gap between the impeller inlet and the pump casing will cause the water in the high-pressure area of the pump to flow through this gap to the low-pressure area, affecting the water output and efficiency! If the gap is too small, it will cause friction between the impeller and the pump casing and wear. To increase the backflow resistance and reduce internal leakage, and to delay the service life of the impeller and pump casing, a sealing ring is installed at the joint between the inner edge of the pump casing and the impeller. The sealing gap should be maintained between 0.25 and 1.10 mm. The stuffing box is mainly composed of packing, water seal ring, packing cylinder, packing cover, and water seal pipe. The main function of the packing gland is to seal the gap between the pump casing and the pump shaft, preventing the water inside the pump from flowing out and preventing air from entering the pump. It maintains the vacuum inside the pump! When the pump shaft and the packing rub against each other and generate heat, the water seal must hold the water inside the water seal ring to cool the packing! This ensures the normal operation of the pump. Therefore, during the routine inspection of the pump operation, the inspection of the packing gland should be particularly noted! The packing should be replaced after about 600 hours of operation. The working principle of the centrifugal pump is: relying on the high-speed rotating impeller, the liquid gains energy under the action of the inertial centrifugal force to increase the pressure. Before the pump operates, the pump body and the inlet pipe must be filled with water to prevent cavitation. When the impeller rotates rapidly, the blades cause the water to rotate quickly, and the rotating water is thrown away under the action of centrifugal force, and the water inside the pump is thrown out, forming a vacuum area in the center of the impeller. The water in the original water source is pressurized by the pipe network under the action of atmospheric pressure (or water pressure) and is pushed into the inlet pipe. This cycle continues to achieve continuous water pumping. It is worth mentioning here: Before starting the centrifugal pump, it must be filled with water in the pump casing before starting, otherwise it will cause the pump body to heat up, vibration, reduced water output, and cause damage to the pump (referred to as "cavitation") and equipment accidents! Cavitation refers to: when the centrifugal pump starts, if there is air in the pump, due to the very low density of the air, the centrifugal force generated after rotation is very small, so the low pressure formed in the center of the impeller is insufficient to suck in the liquid below the pump inlet into the pump, and it cannot convey the fluid. There are many types of centrifugal pumps, and the common classification methods include: single suction centrifugal pump, double suction centrifugal pump; by the number of impellers: single-stage centrifugal pump, multi-stage centrifugal pump; by the impeller structure: open-type impeller centrifugal pump, semi-open-type impeller centrifugal pump, closed-type impeller centrifugal pump; by the working pressure: low-pressure centrifugal pump, medium-pressure centrifugal pump, high-pressure centrifugal pump; by the pump shaft position: horizontal centrifugal pump, vertical centrifugal pump. The ISG domestic water supply pump, domestic water pump, community water pump, domestic water supply and drainage equipment, is designed based on the performance parameters of IS and IR centrifugal pumps and the unique structure of the vertical pump, and is manufactured strictly in accordance with ISO2858 requirements. It is designed using domestic high-quality hydraulic models. It is the most ideal new generation horizontal pump product. This product uniformly adopts hard alloy mechanical seals. Application range: ISW type centrifugal pump is suitable for industrial and urban water supply, such as high-rise building booster water supply, garden sprinkler, fire booster, long-distance transportation, heating and ventilation refrigeration circulation, bathroom booster and equipment matching, with a usage temperature not exceeding 85°C. ISWR type centrifugal pump is widely used: metallurgy, chemical industry, textile, papermaking, and restaurants and hotels, etc. boiler heat source water booster, transportation, and urban heating systems. SGWR type centrifugal pump is used at a temperature not exceeding 120°C.