Abstract
To accommodate special applications where installation space is limited and noise and vibration requirements are high, a new triple screw pump structure was proposed, which was integrated into a servo motor. The design optimizes the profile of the master and slave screws of the embedded triple screw pump. The temperature and pressure fields of the embedded triple screw pump, as well as the heat transfer and pressure distribution between the fluid in the pump and the screw, were investigated through a thermal-fluid-structure approach. The deformation and stresses of the screw were compared for three operating conditions: temperature loading, pressure loading, and thermal-fluid-structure coupling. The results show that the deformation and stresses in the screw tended to increase with increasing pressure and temperature and the pressure load caused more significant deformation and stresses in the screw than the temperature load. The screw deformation caused by pressure loading was found to be the main factor affecting the thermal-fluid-structure coupling. The screw deformation after coupling was smaller than the sum of the screw deformation caused by individual temperature and pressure loads, and the stress values were the same. The results indicate that the coupling action weakens the deformation and stresses in the master and slave screws.
Highlights
The vibration and noise of hydraulic pumps can significantly affect the overall performance, reliable operation, and service life of the hydraulic systems
For investigating the complex turbulent flow field in the triple screw pump, a two-squared k-epsilon (k-ε) turbulence model was used for the calculations and a semi-implicit method of pressure connection equations (SIMPLE) was used for the numerical simulation of the triple screw pump with a convergence accuracy of 10–4
When the temperature fields are analyzed independently, the results indicate that the thermal stresses in the master and slave screws caused by the temperature loads are non-negligible and far greater than those caused by the pressure loads
Summary
The vibration and noise of hydraulic pumps can significantly affect the overall performance, reliable operation, and service life of the hydraulic systems. Previous research on progressive cavity pumps has focused on the flow field, CHARACTERISTICS OF EMBEDDED TRIPLE SCREW PUMP BASED ON THERMAL-FLUID-STRUCTURE COUPLING. A parametric structure was established to study the effect of different operating conditions on the rotor temperature field [11, 12], while the pressure distribution of the flow field in the cavity of the air compressor was studied experimentally and the simulation results were verified [13]. The thermal deformation and energy loss of the screw rotor were simulated, and the heat transfer model of the screw rotor and the thermal coupling of the compressed gas were established to solve the conjugate heat transfer problem of the compressor [14,15,16]. The thermal-fluid-structure coupling method was used to study the temperature field and pressure field distribution of the embedded triple screw pump. The deformation and stress of the screw under temperature load, pressure load, and thermal fluid solid coupling were compared and systematically analyzed
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