Abstract: Aiming at many existing problems of marine steam turbine circulation pump, the design and production process are improved. The improved marine steam circulation pump is verified by land test and voyage test, and the performance fully achieves the predetermined target of improving design. Improved Design of a Marine Steam Turbine Circulating Pump Qiu Zufa Gao Lei Qin Xiaocheng (Harbin No.703 Research Institute) Abstract: The design and production technology of a marine steam turbine circulating pump has been improved on to resolve a whole range of problems. The circulating pump following such an improvement has undergone a land-based test and seafaring verification inspection and been found to have fully met the the Introduction 1 Turbine circulating pump is mainly composed of steam turbine, reducer and circulating pump. Turbine with reducer driven circulating pump work, the seawater suction into the main condenser and the host oil cooler to cool the working fluid. In addition, when the furnace chamber is damaged and leaking, the pump serves as an emergency drainage pump to discharge the accumulated water in the cabin out of the vessel. Turbine by the rotor and the shell composition, the rotor is equipped with blades, reducer pinion gear and to provide lubricants to the bearing gear pump and other components. The housing is equipped with a nozzle box, a quick-closing valve, a first auxiliary valve, a second auxiliary valve, a diaphragm, a turbine seal, a support bearing and a thrust bearing. The reducer is also composed of a rotor and a housing. The rotor is equipped with reducer gear, speed measuring device, supporting bearing and thrust bearing. Shell is also equipped with components such as oil cooler. The circulating pump is still composed of a rotor and a housing. The rotor is provided with a pump wheel (ie a work wheel), a rubber supporting bearing and the like. In order to facilitate the maintenance, the shell is composed of two halves, the vertical middle face is bolted, the shell includes the pump shell, the first half guide, the second half guide, the pump cover, the water inlet part and other components. 2 to improve the design of the proposed 2.1 Turbine steam turbine circulation pump speed control valve by a quick-closing valve, the first auxiliary valve control two nozzles, through these two valves to complete the pump operating conditions. The second auxiliary valve controls three nozzles, open for use when overloaded or when the steam turbine parameters are reduced, or as a backup valve. As the three valves are manual valves, which not only heavy workload, but also difficult to achieve automatic control. In order to solve this problem, the quick-closing valve to self-control valve to increase the role of regulating valve, the other two valves do not change. After the operation of the measure found that there are still two problems: First, the larger size of the quick-closing valve in the small opening state, it is easy to automatically shut down; the second is the valve control more dispersed, when the ship in reverse, to Manually open a auxiliary valve for control, so you can not fully realize the positive and reverse automatic control, so still need to be further improved. 2.2 The original pump on the oil cooler heat pipe easily damaged at the joint easily detached. 2.3 The original circulating pump two plain bearings for the rubber bearings. As the processing technology behind the rubber and copper casting adhesive performance is poor, very low manufacturing yield, which requires improved design. 2.4 The original steam turbine support the existence of the upper end of the lack of fuel supply situation, oil performance needs to be improved in the design to be improved. 2.5 According to equipment development mission statement: The pump shaft speed of 260r / min, found a horizontal vibration resonance peak, and at its speed, while the pump shaft vibration was found to be more intense, so that the pump is difficult to work properly, which Need to find out the reasons for improving the design, to be resolved. 2.6 In order to improve the running performance, an electric oil pump is added, which is used when the unit is started and stopped. 2.7 In addition, some parts of the processing technology needs to be improved to further improve the performance of steam turbine circulating pump
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