Research On The Seawater Hydraulic Axial Piston Electric Motor Pump With Double Swashplates

This thesis has researched the seawater hydraulic electric-motor-pump with double swashplates used in the underwater. The double swashplates axial piston pump is integrated in the rotor. The stator and rotor of motor are canned in shielding sleeves. The closed room of the stator is full of insulating oil, in which the pressure is balance with environment pressure by pressure-balance device. Compared with the traditional structure which motor, coupling, and pump are lined in series, the integration design of hydraulic electric-motor-pump is more compact, smaller size, and lighter weight.The dynamic of rotating module which comprise of pistons, slippers, and cylinder is analyzed in the thesis. The result shows that the dynamic balance of rotating module is got by the symmetrical double swashplates mechanism,the torque in the axial cross-section and axial force are also balanced.According to the research on the characteristics of distributing valve which is rotating with cylinder block, the result shows that the centrifugal force of rotating valve help the opening of inlet valve and the closing of outlet valve. A reasonable designing can conduct that the suction performance is improved, and the volumetric efficiency is available.The electromagnetic field of the electric motor pump is calculated using the finite element analysis software, which provides important reference for the electromagnetic field design of stator and rotor.The prototype is manufactured and experimentally investigated. The results show that the duplex piston pump is disposed in the finite inner space of rotor by using the double swashplates. The performance parameters of prototype are in conformity with the design specifications. The flow rate is 56L/min when it is unload at the rotational speed of 1450rpm, and the volumetric efficiency reaches 70% under the pressure of 8MPa.