Tangent pump for ship

Abstract

The invention discloses a tangent pump for a ship. The tangent pump comprises a motor, a bracket, a pump body, a pump shaft, a sealing expansion part, a mechanical seal, a gland, an impeller, a pump cover and a nut. The bracket is in direct linkage with the motor and the pump body, the mechanical seal and the sealing expansion part are installed on the pump shaft, and the gland is matched with thepump body so that mechanical seal can be axially positioned and a sealing cavity for storing lubricating oil can further be formed. The impeller is installed at the end of the pump shaft and locked to be of a structure rotating along with the motor by the nut. The pump cover is matched with the pump body to form a pump chamber for installing the impeller. According to the tangent pump for the ship, the impeller is of an open type structure and in a gear shape in the axial direction, 8-16 long and short radial blades which are arranged alternately are evenly distributed on the side plate faceof the impeller in an exposed mode, and axial balance holes are formed among the long and short blades; each radial blade is wide in inner portion and narrow in outer portion; frictional loss of a circular disc of the impeller is small, the axial force is small, the structural strength is high, and the impact resistance is high; and in addition, the cooling condition of the mechanical seal is good, a too large temperature difference cannot be generated between the mechanical seal and a medium, and therefore the mechanical seal is not liable to be damaged.

Description

technical field [0001] The invention relates to a centrifugal water pump. Specifically, the invention relates to a tangential pump composed of an open impeller. The pump is matched with a marine pressure water tank. Background technique [0002] The domestic water supply and washing water of large and medium-sized ships are all supplied centrally by the configured pressure water tanks. The marine pressure water tank is a pressure-carrying water accumulator whose water pressure is maintained by a pump. There are mainly two types of water pumps for existing pressure water tanks. The most widely used is the horizontal centrifugal vortex pump, followed by the vertical centrifugal pump. The hydraulic performance of these two pumps can meet the matching requirements of marine pressure water tanks. However, in actual use, the impeller of the horizontal centrifugal vortex pump and the mechanical seal of the vertical centrifugal pump are easily damaged, which directly affects the re...

AI Technical Summary

Problems solved by technology

The existing horizontal centrifugal vortex pumps and vertical centrifugal pumps do not meet the matching requirements of marine pressure water tanks in terms of reliability due to structural defects

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