US 11,788,552 B2
Rotary machine with cooling jacket including helical groove
Kuniaki Iizuka, Tokyo (JP); Yuji Sasaki, Tokyo (JP); Tatsumi Inomata, Tokyo (JP); Ryosuke Yumoto, Tokyo (JP); Kai Iijima, Tokyo (JP); Tatsuya Fukui, Tokyo (JP); Hikaru Sugiura, Tokyo (JP); and Yoshihito Katsu, Tokyo (JP)
Filed by IHI Corporation, Tokyo (JP)
Filed on Dec. 24, 2020, as Appl. No. 17/133,628.
Application 17/133,628 is a continuation of application No. PCT/JP2019/012961, filed on Mar. 26, 2019.
Claims priority of application No. 2018-122926 (JP), filed on Jun. 28, 2018.
Prior Publication US 2021/0115925 A1, Apr. 22, 2021
Int. Cl. F04D 29/58 (2006.01); F04C 29/04 (2006.01); H02K 5/20 (2006.01); F04D 25/06 (2006.01); H02K 5/06 (2006.01); H02K 7/14 (2006.01); H02K 15/14 (2006.01); F04D 13/06 (2006.01)
CPC F04D 29/5806 (2013.01) [F04C 29/04 (2013.01); F04D 25/06 (2013.01); F04D 29/584 (2013.01); H02K 5/06 (2013.01); H02K 5/203 (2021.01); H02K 7/14 (2013.01); H02K 15/14 (2013.01); F04D 13/06 (2013.01); F05D 2250/25 (2013.01); F05D 2250/294 (2013.01); H02K 2213/03 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A rotary machine comprising:
a motor including a rotor and a stator; and
a cooling jacket disposed around the stator, wherein the cooling jacket includes:
a cylindrical inner body part in contact with the stator and comprising an outer circumferential surface that defines an outer diameter of the inner body part;
a cylindrical outer body part surrounding the inner body part; and
a helical groove formed in the outer circumferential surface of the inner body part and configured to transmit a cooling medium, the helical groove circling helically at an oblique angle around the inner body part a plurality of times,
wherein the helical groove includes a pair of side surfaces opposed to each other in a direction of an axis of rotation of the rotor and a bottom surface, the pair of side surfaces connected to and extending from the bottom surface of the helical groove to the outer circumferential surface of the inner body part,
wherein the inner body part has a virtual region being cylindrical about the axis of rotation, the virtual region having an outer diameter bounded by the bottom surface of the helical groove,
wherein each of the side surfaces is formed having a draft angle that is inclined away from each other, the draft angle determined relative to a direction orthogonal to the axis of rotation, and
wherein the draft angle is larger than the oblique angle of the helical groove and is derived using formula (1) under the condition of formula (2),

OG Complex Work Unit Math
where S is the draft angle, D1 is the outer diameter of the inner body part, D2 is the outer diameter of the virtual region, P is an array pitch of the helical groove in the direction of the axis of rotation, and B is a width of the bottom surface in the direction of the axis of rotation.