Heat resistant structure of flying body and manufacturing method of heat resistant structure of flying body

1 . A heat resistant structure of a flying body, applied to a flying body comprising:

a tip part arranged at a front end of the flying body with respect to a direction of travel of the flying body; and

a body part arranged in a back direction from the tip part with respect to the direction of travel of the flying body,

wherein the tip part comprises:

a surface member arranged on an outer surface of the tip part, the surface member having a melting point higher than a maximal temperature reached on a surface of the flying body when the flying body moves in an atmosphere and is heated;

a base part configured to couple the surface member to the body part; and

an insulation member arranged between the surface member and the base part, the insulation member configured to thermally insulate the base part from the surface member,

wherein the surface member comprises a heat resistant material including a zirconium carbide, a tantalum carbide or a hafnium carbide on at least an outer surface of a carbon fiber reinforced carbon composite material that has a shape of the surface member, and

wherein a density of the zirconium carbide, the tantalum carbide or the hafnium carbide in the heat resistant material decreases continuously from a front direction to a back direction with respect to the direction of travel of the flying body.

2 . A heat resistant structure, applied to a flying body comprising:

a tip part arranged at a front end of the flying body with respect to a direction of travel of the flying body; and

a body part arranged in a back direction from the tip part with respect to the direction of travel of the flying body,

wherein the tip part comprises:

a surface member arranged on an outer surface of the tip part, the surface member having a melting point higher than a maximal temperature reached on a surface of the flying body when the flying body moves in an atmosphere and is heated;

a base part configured to couple the surface member to the body part; and

an insulation member arranged between the surface member and the base part, the insulation member configured to thermally insulate the base part from the surface member,

wherein the surface member comprises a surface member protrusion that protrudes from an inner surface of the surface member to an inner space of the surface member,

wherein the tip part further comprises:

an abutting member of which at least a part is arranged in a front direction from the surface member protrusion with respect to the direction of travel of the flying body, the abutting member being configured to abut on a front surface of the surface member protrusion; and

a coupling member configured to couple the abutting member and the base part, and

wherein the base part comprises a base part abutting surface configured to receive a reaction force from the surface member from the front direction.

3 . The heat resistant structure, applied to the flying body according to claim 2 ,

wherein the abutting member comprises:

a holding part configured to hold the insulation member between the holding part and the inner surface; and

an abutting member protrusion that protrudes from an outer surface of the abutting member to outside the abutting member, the abutting member protrusion configured to abut on the surface of the surface member protrusion in the front direction, and

wherein the coupling member comprises a bolt configured to fasten the base part to the abutting member.

4 . The heat resistant structure, applied to the flying body according to claim 3 ,

wherein the abutting member further comprises an abutting member concavity arranged adjacent to the abutting member protrusion in a circumferential direction perpendicular to the direction of travel of the flying body, the abutting member concavity having a shape so that the surface member protrusion passes therethrough when the abutting member moves into the inner space of the surface member in the direction of travel of the flying body,

wherein the surface member further comprises a surface member concavity arranged adjacent to the surface member protrusion in the circumferential direction, the surface member concavity having a shape so that the abutting member protrusion passes therethrough when the abutting member moves into the inner space of the surface member in the direction of travel of the flying body, and

wherein the base part comprises a circumferential direction restrainer having a shape to be insertable from the back direction to the front direction so as to restrain the surface member and the abutting member from rotating in the circumferential direction by penetrating through the surface member concavity and the abutting member concavity in an overlapped state when the base part moves in the direction of travel of the flying body to abut on the abutting member in a state in which the abutting member protrusion is arranged in the front direction from the surface member protrusion with respect to the direction of travel of the flying body.

5 . The heat resistant structure, applied to the flying body according to claim 3 ,

wherein the tip part further comprises a gasket arranged between the surface member and the base part to relieve a stress generated by a deformation of the surface member due to heating.

6 . The heat resistant structure, applied to the flying body according to claim 3 ,

wherein the tip part further comprises a biasing device configured to bias the bolt, which penetrates through the base part and is fastened to the abutting member, in the back direction, and relieve a stress generated by a deformation of the surface member due to heating.

7 . The heat resistant structure, applied to the flying body according to claim 2 ,

wherein the surface member further comprises:

a groove provided in the front direction from the surface member protrusion so as to go around an inner wall surface of the surface member in a circumferential direction perpendicular to the direction of travel of the flying body; and

a surface member abutting part provided in the front direction from the groove, and protruding from the surface member protrusion to the inner space,

wherein the abutting member comprises:

a C-shape retaining ring fit into the groove; and

a fixing member held between the C-shape retaining ring and the surface member abutting part,

wherein the fixing member comprises a bolt part extending in the back direction,

wherein the base part comprises a hole through which the bolt part penetrates in a state in which the base part is coupled to the abutting member, and

wherein the coupling member comprises a nut configured to fasten the bolt part to the base part.

8 . The heat resistant structure, applied to the flying body according to claim 2 ,

wherein the surface member protrusion comprises a passage provided to fill the inner space of the surface member with the insulation member from outside,

wherein the coupling member is configured to couple the base part to the surface member by penetrating through the surface member protrusion and fastening the surface member protrusion to the abutting member, and

wherein the base part comprises a base part protrusion configured to block the passage by fastening the base part to the surface member.

9 . The heat resistant structure, applied to the flying body according to claim 2 ,

wherein the surface member protrusion comprises a passage provided to fill the inner space of the surface member with the insulation member from outside,

wherein the abutting member comprises:

a coupling part configured to be coupled to the coupling member;

a plurality of barbs configured to be connected to the coupling part and locked to the passage;

a plurality of shafts configured to respectively connect the plurality of barbs to the coupling member; and

a penetration hole around which the plurality of shafts are arranged, and

wherein the base part comprises a base part protrusion configured to penetrate through the penetration hole to restrain the plurality of barbs from being disconnected from the surface member protrusion in a state in which the base part is coupled to the abutting member.