Main cooling water pump for nuclear power plant

Abstract

The invention provides a main cooling water pump for a nuclear power plant. The main cooling water pump comprises a concrete spiral casing, a pump assembly arranged inside the concrete spiral casing and a motor arranged above the concrete spiral casing. The pump assembly comprises a pump shaft, an impeller and a pump body, and the motor and a pump shaft are connected in a transmission mode; an upper supporting piece, cutwaters and a lower supporting ring are embedded in the concrete spiral casing, and the upper supporting piece, the cutwaters and the lower supporting ring are all parts formedthrough welding and are provided with bolt holes correspondingly; the upper supporting piece and the cutwaters as well as the cutwaters and the lower supporting ring are connected through bolts whichpenetrate through the corresponding bolt holes, and the upper supporting piece is connected with a pump cover inside the pump body; and the lower supporting ring is connected with the bottom of the pump body. According to the main cooling water pump for the nuclear power plant, the upper supporting piece, the cutwaters and the lower supporting ring are all formed through welding, bolted holes arepreformed in the upper supporting piece, the cutwaters and the lower supporting ring, thus during construction, the upper supporting piece, the cutwaters and the lower supporting ring are connected with one another through the bolts, and construction is convenient accordingly.

Description

technical field [0001] The invention relates to the technical field of water pumps, in particular to a main cooling water pump for nuclear power plants. Background technique [0002] The function of the main cooling water pump of the nuclear power plant is to provide the necessary cooling water to the condenser of the steam turbine and the auxiliary cooling water system. At present, the concrete volute pump is mainly used as the main cooling water pump. The main cooling water pump is a large-scale equipment. Each unit of an existing nuclear power plant in China is usually equipped with two main cooling water pumps working at the same time, and no pump is used for equipment. The concrete volute pump is a mixed flow pump with a volute-shaped pump casing. The speed of the concrete volute pump is much lower than that of the centrifugal pump, generally below 200r / min. Usually, the motor driving the concrete volute pump is indirectly connected to the pump shaft 9 located in the ...

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Problems solved by technology

Concrete volute pumps using this connection method have been widely used in nuclear power plants at home and abroad. The advantage is that the output speed of the motor can be adjusted to meet the requirements of the pump; the disadvantage is that the construction of the concrete volute pump is difficult, and it is difficult for pump components. The installation is time-consuming and laborious; the reliability is reduced, and the probability of mechanical failure is increased due to the existence of the gearbox; the gearbox is equipped with a complex lubricating oil system and control system, and the operation and maintenance of the equipment is complicated

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