Closed-type liquid cooling motor frame and method for manufacturing the same

A method for manufacturing a closed-type liquid-cooling motor frame, comprising the steps of:

• (a) providing a sand core having a main portion and a plurality of core-head members connected with the main portion, wherein the sand core comprises an initial section, a connected middle section and a terminal section, the connected middle section is located between the initial section and the terminal section;
• wherein the connected middle section comprises a plurality of axial extension sub-sections extending individually in an axial direction parallel to a central axis and a plurality of peripheral extension sub-sections extending individually by surrounding the central axis, and each of the plurality of axial extension sub-sections and each of the plurality of peripheral extension sub-sections are connected staggeredly by an end-to-end manner;
• wherein the plurality of core-head members are identical to each other;
• (b) performing a casting process to produce a frame casting, wherein the frame casting has oppositely a first and a second end, the first end has a first-end inner wall, the second end has a second-end inner wall, the main portion forms a closed water channel between the first-end inner wall and the second-end inner wall, and the plurality of core-head members form individually a water inlet, a water outlet and a plurality of sand-expelling holes at the first end;
• wherein the plurality of core-head members protrude individually from the initial section, the terminal section and the plurality of peripheral extension sub-sections in respective directions away from the central axis, the core-head member protruding from the initial section is to form the water inlet, the core-head member protruding from the terminal section is to form the water outlet, and the core-head members protruding individually from the corresponding peripheral extension sub-sections are to form the plurality of sand-expelling holes;
• (c) shaking the frame casting to expel at least a portion of the sand core from the closed water channel through the water inlet, the water outlet and the plurality of sand-expelling holes;
• (d) pressurizing a fluid into the closed water channel via the water inlet, and then the fluid carrying the rest of the sand core to leave the closed water channel via the plurality of sand-expelling holes and the water outlet;
• and
• (e) providing a plurality of screw bolts to lock the plurality of sand-expelling holes to form a closed-type liquid-cooling motor frame.