Submersible pumps and centrifugal pump features

Posted by uuuseff on November 17th, 2019

Submersible pumps can be placed under water, centrifugal pumps on the ground, that size should be the diameter of their connection. Submersible pump is a very wide range of water treatment tools. Unlike ordinary pumps, it works underwater, while most pumps work on the ground. Submersible pump works Before the pump, the suction pipe and pump must be filled with liquid. After the pump is turned on, the impeller rotates at a high speed and the liquid rotates along with the blades. Under the action of centrifugal force, the liquid will fly out of the impeller and the liquid will gradually become slower in the diffusion chamber of the pump housing, and the pressure gradually increases. Export, discharge pipe outflow. At this time, at the center of the vane, liquid is thrown around to form a vacuum low-pressure area free of air and liquid, and the liquid in the liquid pool flows into the pump through the suction pipe by the atmospheric pressure of the pool surface, Continuously sucked up from the liquid pool and continuously from the discharge pipe outflow. Submersible pump basic parameters include flow, lift, pump speed, power, rated current, efficiency, diameter and other submersible pump main purposes and scope of application, including construction and drainage, irrigation and drainage agriculture, industrial water cycle, urban and rural residents cited water supply, Even rescue and disaster relief, etc. 2. Centrifugal pump to say what is centrifugal Centrifugal is actually the performance of objects inertia, such as water droplets on umbrellas, when the umbrella slowly turns, the water droplets will follow the umbrella rotation, it is because of the friction between the umbrella and water droplets As a centripetal force to the water droplets, but if the umbrella rotation speed up, the friction is not enough to make the water droplets in a circular motion, then the water droplets will be out of the umbrella to the outer edge of the movement, like pulling a block of stone with a circular motion, If the speed is too fast, the rope will be broken, the stones will fly out. This is the so-called centrifugal. Centrifugal pump is designed according to this principle. High-speed rotation of the impeller blades drive the water to rotate, the water thrown, so as to achieve delivery The purpose of centrifugal pump has a variety of.From the use can be divided into civilian and industrial pumps, from the transmission medium can be divided into water pump, impurity pump, resistance Corrosion pump and so on. The basic structure of the centrifugal pump is composed of six parts, namely: impeller, pump body, pump shaft, bearings, seal ring, stuffing box. 1, the impeller is the core part of the centrifugal pump, its speed is high, the impeller blades play a major role in the impeller assembly before static balance experiment. The inner and outer surfaces of the impeller require smoothness to reduce the frictional loss of water flow. 2, also known as the pump casing, it is the main pump. To support the role of fixed, and with the bearing bracket to connect. 3, the role of the pump shaft is connected by a coupling and motor, the motor torque to the impeller, so it is the main component of mechanical energy transfer. 4, the bearing is set on the pump shaft supporting the pump shaft components, there are two types of rolling bearings and plain bearings. Rolling bearings using butter as a lubricant to the appropriate general size of 2/3 ~ 3/4 Too much heat, too little sound and fever! Sliding bearings are used as a transparent oil lubricant, refueling to the oil level line. Too much oil to bleed along the pump shaft and drift *, too little bearing but also overheating and burn accident! In the process of running the pump bearing temperature up to 85 degrees generally run at 60 degrees, if high, we must find out the reason (whether impurities, whether the oil is black, whether the water) and timely treatment! 5, seal ring, also known as leakage ring. The gap between the impeller inlet and the pump casing is too large, causing the water in the high-pressure area of ​​the pump to flow to the low-pressure area through this gap, affecting the output of the pump and reducing the efficiency. The gap is too small will cause the impeller and the pump shell friction wear. In order to increase the backflow resistance to reduce internal leakage, delay the service life of the impeller and the pump housing, the inner edge of the pump housing and the impeller is provided with a sealing ring at the joint of the outer support, and the sealed clearance is maintained at between 0.25 and 1.10mm. 6, stuffing box mainly by the filler, water seal ring, packing tube, packing gland, water seal tube. The purpose of the stuffing box is to close the gap between the pump housing and the pump shaft so that the water inside the pump does not flow outside and the outside air does not enter the pump. Always keep the pump vacuum! When the pump shaft friction with the filler to generate heat will depend on the water seal to live in the water seal ring so that the filler cooling! Maintain the normal operation of the pump. Therefore, during the inspection of the pump running inspection of stuffing box is a special note! Filler needs to be replaced after about 600 hours of operation. Centrifugal pump works: rely on high-speed rotating impeller, the liquid in the inertial centrifugal force obtained energy to increase the pressure. Pump before work, the pump body and inlet must be full of water to prevent cavitation. When the impeller rotates rapidly, the blades cause the water to rotate rapidly. The rotating water flies from the impeller under the centrifugal force. After the water in the pump is thrown out, the central part of the impeller forms a vacuum area. Suwon's water pressure in the air pressure (or water pressure) under pressure through the pipe into the water pipe. This endless cycle, you can achieve continuous pumping. It is worth mentioning that: before starting the pump must be filled with water to the pump casing before starting, otherwise it will cause the pump body heat, vibration, reduce the amount of water, causing damage to the pump (referred to as "cavitation") Cause equipment accident! The so-called cavitation refers to: Centrifugal pump start, if there is air pump, due to the low density of air, centrifugal force generated after rotation is small, so the low pressure in the central area of ​​the impeller is insufficient to lower the liquid level than the pump inlet Liquid inhalation pump, can not transport fluid phenomenon. Centrifugal pumps are many types of classification are common in the following ways 1, according to the way the impeller inhalation: single suction centrifugal pump double suction centrifugal pump; 2, according to the number of impeller: single-stage centrifugal pump multistage centrifugal pump; 3, according to the impeller structure points: open impeller centrifugal pump semi-open impeller centrifugal pump closed impeller centrifugal pump; 4, according to the working pressure points: low pressure centrifugal pump medium pressure centrifugal pump high pressure centrifugal pump; 5, according to the pump shaft position points: Horizontal Centrifugal Pump Vertical Centrifugal Pump. ISG life to the pump, pump life, residential pumps, domestic water supply and drainage equipment, according to IS, IR centrifugal pump performance parameters and the unique combination of vertical pump design, and in strict accordance with the requirements of ISO2858 to set up wine production, using domestic high-quality hydraulic Model design, is the ideal next-generation horizontal pump products. The product will be used carbide mechanical seal. Applications: ISW pump for industrial and urban water supply and drainage, such as high-rise building pressurized water, garden sprinkler, fire pressurization, long distance transmission, HVAC refrigeration cycle, bathroom booster and equipment, the use of temperature does not exceed 85oC . ISWR pump is widely used in: boilers, such as metallurgy, chemical industry, textile, paper making and guesthouses boiler booster water supply, transportation and urban heating system, SGWR type temperature does not exceed 120oC.

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