High-speed special submerged motor for engineering ship

Abstract

The invention relates to a high-speed special submerged motor for an engineering ship, which comprises a stator, a rotor, a movable sealing device, a shaft current preventing structure and a leader cable. The motor is characterized in that a stator punching (1) is in a parallel gear structure; the groove-shaped part of a rotor punching (2) is in a structure that the upper portion is wider than the lower portion; the movable sealing device is arranged at the end part of the submerged motor and comprises a stator (3) and a revolving shaft (12); a shaft sleeve (10) is fixed on the revolving shaft (12) and provided with a cooling water inlet (14) and a cooling water outlet (15), and the inside of the shaft sleeve (10) is provided with longitudinal blades (16); the shaft current preventing structure is arranged at the tail of the submerged motor; and the leader cable comprises a junction box (30), an external nut (39), an internal nut (31), a three-core cable (28) and a pipe joint (34). The invention solves the problem of cooling the heated shaft sleeve and bearing of the submerged motor, improves the adaptability of the submerged motor to non-sinusoidal power supplies, effectively prevents the damage to the bearing caused by the occurrence of shaft current, and ensures that the submerged motor runs for a long time without water leakage under the hydraulic pressure at the position of 30 meters below the water surface.

Description

technical field [0001] The invention relates to a submersible motor, in particular to a high-speed special submersible motor for engineering ships. Background technique [0002] With the expansion of ocean development and port engineering, my country's port construction, river dredging, land reclamation and other projects require a large number of large-scale engineering ships for construction. Among them, underwater reamers and mud pumps must use high-power and high-speed submersible motors. The dredger driven by the submersible motor is energy-saving and environmentally friendly, has a large digging force, is convenient for speed regulation, and can also cope with harsh working conditions. Since the submersible motor operates at 20 to 30 meters underwater, reliable sealing is the prerequisite for the normal operation of the motor; the existing dynamic seal for submersible motors is suitable for low-power submersible motors, and if it is used for high-power and high-speed s...

AI Technical Summary

Problems solved by technology

Since the submersible motor operates at 20 to 30 meters underwater, reliable sealing is the prerequisite for the normal operation of the motor; the existing dynamic seal for submersible motors is suitable for low-power submersible motors, and if it is used for high-power and high-speed submersible motors, then Because the diameter of the shaft is large, the speed is high, and the contact line speed between the oil seal and the shaft sleeve is high, it will cause the shaft sleeve to heat up, causing leakage and damage to the submersible motor

[0003] The slot structure of the rotor and stator of the existing submersible motor is usually that the stator has non-parallel teeth, and the rotor slot has a pear-shaped or parallel slot structure, etc. When the submersible motor is powered by a frequency converter, due to the voltage output by the frequency converter The current contains a series of high-order harmonics, which reduces the efficiency of the motor, the temperature rise is too high, the motor is prone to torque ripple when it is running at low speed, and vibration and noise will be generated when the motor is running at high speed, which cannot fully meet the requirements of customers.

[0004] The tail of the existing submersible motor does not have a shaft current prevention structure. When the bearing is running at high speed, when the parameters such as the number of poles and groove shape of the submersible motor are improperly matched, shaft current may be formed, resulting in electric corrosion of the bearing of the submersible motor and making the submersible The motor's bearings fail in a month or so

[0005] High-speed special submersible motors on engineering ships generally operate at a depth of 20 to 30 meters underwater and require a very long submersible motor cable. The cable core wires of existing submersible motors are all sealed with a single cable without sealing measures. Due to the gap between the core wire and the shell of the three-core cable, the reliability of the seal is very low

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