Hydrodynamic bearing-type pump

Abstract

A hydrodynamic pressure bearing type pump includes a main body having a fluid flow inlet formed at one end portion thereof and a fluid flow outlet formed at the other end portion thereof and a rotating portion disposed within a fluid flow passage of the fluid within the main body to generate hydrodynamic pressure to let the fluid flow into the fluid flow inlet and to let the fluid flow from the fluid flow outlet to the outside. The rotating portion includes a shaft, a hydrodynamic pressure bearing for generating hydrodynamic pressure to let the fluid flow into the fluid flow inlet and to let the fluid flow from the fluid flow outlet to the outside when the shaft is rotated and a rotation force generating portion disposed within the main body to generate rotation force for rotating the shaft when it is energized.

Description

technical field The present invention relates to a dynamic pressure bearing type pump as a power source for discharging fluid. Background technique A pump for discharging fluid is used, for example, in an artificial heart (for example, refer to Japanese Patent Application Publication No. 6-102087, pages 3 to 5, FIG. 5 ). The above-mentioned conventional pump is shown in FIG. 6, and FIG. 7 shows the dynamic pressure bearing of the conventional pump in FIG. In FIG. 6 , a conventional pump 310 includes a dynamic pressure shaft 320 with radial and axial dynamic pressure generating grooves and a rotor magnet 322 . The dynamic pressure shaft 320 rotates integrally with the rotor magnet 322, and an armature coil 323 for driving the rotor magnet 322 is also provided in the pump partition 324. In the conventional pump 310, the dynamic pressure bearing 321 is used both as a pressure generator for pumping pressure and as a device for supporting the rotor magnet 322 in a radial an...

AI Technical Summary

Problems solved by technology

Moreover, in the past, in order to dispose the motor inside, the outer wall of the pump is composed of a plurality of members such as the cylindrical portion 325 and the partition wall 324, so it is difficult to completely seal the connecting portion between the cylindrical portion 325 and the partition wall 324 without fluid leakage. , lack of reliability

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