The Practice of Reducing the Operating Temperature of Centrifugal Pump Bearings Liu Jianhua Xiao Yuxin Zhao Wanyong
Structure of the pump schematic diagram of the structure of the improved pump. The pump is a kind of fluid machinery that converts the mechanical energy of the prime mover into the kinetic energy and pressure energy of the fluid. The pump is also a widely used general-purpose machine. During operation, the pump acts to deliver liquid and provide the required media pressure and flow. The pump's performance range, working temperature, and type of pumping media are all very broad. Therefore, whether it is labor, agriculture, defense, technology, or daily life, pumps are needed everywhere. Pumps are in operation everywhere. %~25% is consumed on the pump.
Among various pumps, centrifugal pumps are the most widely used. According to the statistics of related industries, more than 70% of pump products are centrifugal pumps, so the reliability and performance of centrifugal pumps are very important.
2 pump operating conditions and problems Zhengzhou a paper mill reverse osmosis water treatment system in the high-pressure water pump pumping normal temperature water, using a single-stage single-suction water centrifugal pump operating conditions: 0 = 275m3 / h, / f = 222m, n = 2980r/min, supporting power P = 280kW, installed in reverse irrigation, with a height of 3.9m, in line with the operating requirements of the pump provided by the manufacturer.
However, after the pump has reached a stable operating state, the temperature at both ends of the suspension body near the bearing end is approximately 70 T or so (measured at an ambient temperature of approximately 25 T). If the pump room temperature is up to 40 in the summer, the bearing temperature is maintained. It will further increase, thus affecting the long-term safe and reliable operation of the pump, so the user has proposed to take effective measures to reduce the bearing temperature as much as possible.
From the point of view of pump operation requirements, the temperature of the bearing during the operation of the pump is up to 85, which is generally around 60t. Therefore, during the process, the surface temperatures of the two ends of the suspension body are measured at an ambient temperature of 25°C. Close to 70 feet, really high, should be dealt with promptly.
3 The original structure of the pump The original structure of the pump As shown, the overall structure of the pump is a single-stage, single-suction, cantilever, horizontal, clean water centrifugal pump; the pump body is a double scroll type, and the impeller is a centrifugal impeller with front and rear ports Ring and balance hole structure, the bearing configuration for the impeller side is a single row of short cylindrical roller bearings, shaft extension side for the pair of back-to-back angular contact ball bearings, bearing lubrication using thin oil lubrication.
4 Existing problems and solutions In view of the problem of high bearing temperature, we carefully examined the components of the pump, the lubricant, and the bearings themselves, and found that the above conditions are all normal, and the pump installation conditions are no problem, so the analysis considers the pump After reaching a stable operating state, the bearing temperature will stop rising and tend to a certain constant value. The temperature should be related to bearing bearing conditions, bearing specification and model, and configuration. From the structural point of view of the pump, the double scroll structure of the pump body can play the role of balancing the radial force; the impeller front and rear mouth ring and balance hole structure can balance the axial force, and its balance ability depends on the total area of ​​the balance hole to 6 Chen Lide Basic mechanical design. Beijing: Higher Education Press, 375~377 (Editor Chen Lixia)
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