To solve problems in a conventional refrigerant pump wherein an intermediate shell is provided to ease distortion in welding, but the number of parts is increased and the tolerance of each part is accumulated to make centering of a drive shaft and a bearing difficult, and if integrated in the eccentric state, rotational torque becomes large to impede smooth rotation, and further drawing had to be performed, while securing dimensional accuracy because the whole periphery is formed of a thin-walled closed container, which results in difficult processing.
A pump mechanism part is mounted inside a thick-walled closed container, and the thick-walled closed container is inserted in the thin-walled closed container and welded. If the dimensional accuracy of the thick-walled closed container is improved with this constitution, centering is facilitated.
WO/2023/186981 | FLUID PUMP FOR AN AIRCRAFT TURBOMACHINE, LUBRICATION CIRCUIT AND AIRCRAFT TURBOMACHINE |
JP2021501279 | Oil pump |
ASHITANI HIROMASA
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