Cooling water jacket

The invention relates to a cooling water jacket, and aims to provide a two-way four-spiral cooling water jacket for a rotary machine, which not only can ensure the uniformity of circumferential and axial temperature fields of the rotary machine, but also can reduce flow resistance and improve the structural rigidity of the water jacket, and is particularly suitable for high-speed and high-precision rotary machines such as an electric spindle. Comprising an inner sleeve, an outer sleeve, a water return ring and a rear end cover, the inner sleeve and the outer sleeve are sleeved together to form a water jacket base body, and the water return ring and the rear end cover are installed at the front end and the rear end of the water jacket base body respectively; the outer surface of the inner sleeve is provided with four spiral water channels, and the four spiral water channels, the outer sleeve, the water return ring and the rear end cover form a two-in and two-out closed parallel water channel. 本发明涉及一种冷却水套，旨在提供一