Cooling channel structure and burner
A cooling channel structure includes a tubular member with openings at both ends. In an inner portion of the tubular member or on a surface of the tubular member, as cooling channels for a cooling medium for cooling the tubular member, spiral outer surface-side channels are located on an outer surface side of the tubular member, at least one inner surface-side channel is located on an inner surface side of the tubular member, and folded channels, respectively, connect the outer surface-side channels and the at least one inner surface-side channel on one end side of the tubular member.
1 . A cooling channel structure, comprising:
a tubular member with openings at both ends; and
cooling channels for a cooling medium for cooling the tubular member, the cooling channels including:
spiral outer surface-side channels on an outer surface side of the tubular member;
spiral inner surface-side channels on an inner surface side of the tubular member in an inner portion of the tubular member or on a surface of the tubular member; and
folded channels, respectively, connecting the spiral outer surface-side channels and the spiral inner surface-side channels on one end side of the tubular member,
wherein the folded channels are curved such that a first direction in which the spiral outer surface-side channels curve toward a downstream side along a spiral and a second direction in which the spiral inner surface-side channels curve toward the downstream side along the spiral are opposite to each other.
2 . The cooling channel structure according to claim 1 ,
wherein the spiral outer surface-side channels, and the folded channels are in the inner portion of the tubular member or on the surface of the tubular member.
3 . The cooling channel structure according to claim 1 , wherein the one end side of the tubular member is a first end side of the tubular member and the cooling channel structure further comprises:
an inlet for the cooling medium on a second end side of the tubular member; and
an outlet for the cooling medium on the second end side of the tubular member.
4 . The cooling channel structure according to claim 1 , wherein the one end side of the tubular member is a first end side of the tubular member and the cooling channel structure further comprises:
a header connecting end portions of the spiral outer surface-side channels, on a second end side of the tubular member.
5 . The cooling channel structure according to claim 1 ,
wherein at least the spiral outer surface-side channels or the spiral inner surface-side channels include a section in which a channel cross-sectional area changes according to an axial position of the tubular member.
6 . The cooling channel structure according to claim 5 ,
wherein at least the spiral outer surface-side channels or the spiral inner surface-side channels include a section in which the channel cross-sectional area decreases toward the folded channels.
7 . The cooling channel structure according to claim 1 ,
wherein at least the spiral outer surface-side channels or the spiral inner surface-side channels include a section in which a cross-sectional shape changes according to an axial position of the tubular member.
8 . A burner, comprising:
the cooling channel structure according to claim 1 .
9 . A cooling channel structure, comprising:
a tubular member with openings at both ends; and
cooling channels for a cooling medium for cooling the tubular member, the cooling channels including:
spiral outer surface-side channels on an outer surface side of the tubular member;
spiral inner surface-side channels on an inner surface side of the tubular member in an inner portion of the tubular member or on a surface of the tubular member; and
folded channels, respectively, connecting the spiral outer surface-side channels and the spiral inner surface-side channels on one end side of the tubular member,
wherein the folded channels are curved such that a first direction in which the spiral outer surface-side channels curve toward a downstream side along a spiral and a second direction in which the spiral inner surface-side channels curve toward the downstream side along the spiral are the same as each other.
10 . A cooling channel structure, comprising:
a tubular member with openings at both ends;
a header; and
cooling channels for a cooling medium for cooling the tubular member, the cooling channels including:
spiral outer surface-side channels on an outer surface side of the tubular member;
spiral inner surface-side channels on an inner surface side of the tubular member in an inner portion of the tubular member or on a surface of the tubular member; and
folded channels, respectively, connecting the spiral outer surface-side channels and the spiral inner surface-side channels on a first end side of the tubular member,
wherein the header connects end portions of the spiral inner surface-side channels, on a second end side of the tubular member.
11 . The cooling channel structure according to claim 10 , wherein:
the header is connected to an inlet for the cooling medium in the tubular member; and
the header has a channel cross-sectional area which expands as a distance from the inlet increases.