US-12618523-B2 - Liquid tank, rocket, and method of manufacturing liquid tank

Abstract

Provided is a liquid tank, including: a cylindrical seamless tank body having both end portions being reduced in diameter toward respective end sides; and a plurality of annular baffles provided inside the tank body and arranged at intervals in an axial direction of the tank body, in which at least one of the plurality of baffles is held on an inner peripheral surface of the tank body.

Inventors

• Yoshiki Sakaguchi
• Masahiko Yamazaki
• Shinichi MISHIMA
• Thibault BAGNOL
• Mitsunori ITOH
• Tor VISCOR

Assignees

• IHI CORPORATION
• MJOLNIR SPACEWORKS CO., LTD.

Dates

Publication Date

20260505

Application Date

20231129

Priority Date

20210601

Claims (9)

1. 1 . A liquid tank, comprising: a tank body having both end portions being reduced in diameter toward respective end sides, the tank body has a cylindrical part, and the entire tank body is seamless; and annular baffles provided inside the tank body and arranged at intervals in an axial direction of the tank body, in which at least one of the baffles is held on an inner peripheral surface of the tank body, wherein the baffles include end baffles held on the inner peripheral surface of the tank body and normal baffles having an outer peripheral surface spaced apart from the inner peripheral surface of the tank body, wherein the end baffles and the normal baffles are arranged coaxially, wherein the baffles are connected to each other by a connecting member which is a rod-shaped member extending in the axial direction.
2. 2 . The liquid tank according to claim 1 , wherein the end baffles are clamped by the inner peripheral surface of the tank body.
3. 3 . A rocket comprising the liquid tank of claim 2 .
4. 4 . The liquid tank according to claim 1 , wherein the end baffles are located at both ends in the axial direction among the baffles.
5. 5 . A rocket comprising the liquid tank of claim 4 .
6. 6 . The liquid tank according to claim 1 , wherein an inclined surface inclined with respect to the axial direction is formed on a surface other than an outer peripheral surface of the end baffles.
7. 7 . A rocket comprising the liquid tank of claim 6 .
8. 8 . A rocket comprising the liquid tank of claim 1 .
9. 9 . A method of manufacturing a liquid tank, comprising: installing annular baffles inside a cylindrical blank pipe at intervals in an axial direction of the blank pipe; and after installing the baffles inside the blank pipe, reducing both end portions of the blank pipe in diameter toward respective end sides to form a seamless tank body, wherein the tank body has a cylindrical part, and the entire body is seamless, wherein at least one of the plurality of baffles is held on an inner peripheral surface of the tank body, wherein the baffles include end baffles held on the inner peripheral surface of the tank body and normal baffles having an outer peripheral surface spaced apart from the inner peripheral surface of the tank body, wherein the end baffles and the normal baffles are arranged coaxially, wherein the baffles are connected to each other by a connecting member which is a rod-shaped member extending in the axial direction.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application is a continuation application of International Application No. PCT/JP2022/022288, filed on Jun. 1, 2022, which claims priority to Japanese Patent Application No. 2021-92569, filed on Jun. 1, 2021, the entire contents of which are incorporated by reference herein. BACKGROUND ART Technical Field The present disclosure relates to a liquid tank, a rocket, and a method of manufacturing a liquid tank. The present application claims the benefit of priority based on Japanese Patent Application No. 2021-92569 filed on Jun. 1, 2021, and the content thereof is incorporated herein by reference. Related Art A liquid tank that accommodates a liquid is used in various devices or various facilities. For example, in Patent Literature 1, there is a disclosure of a hybrid rocket including an oxidant tank that accommodates a liquid oxidant. CITATION LIST Patent Literature Patent Literature 1: JP 2011-020880 A SUMMARY Technical Problem In a related-art liquid tank in various devices or various facilities, the manufacturing process may become redundant due to the presence of a seam caused by welding, bolt fastening, or the like. For example, the manufacturing process of a liquid tank may tend to become redundant due to, for example, the necessity for designing in consideration of a weak point and a defect of welding. An object of the present disclosure is to provide a liquid tank, a rocket, and a method of manufacturing a liquid tank that enable shortening of the manufacturing process of a liquid tank. Solution to Problem In order to solve the above-mentioned problem, according to the present disclosure, there is provided a liquid tank, including: a cylindrical seamless tank body having both end portions being reduced in diameter toward respective end sides; and a plurality of annular baffles provided inside the tank body and arranged at intervals in an axial direction of the tank body, in which at least one of the plurality of baffles is held on an inner peripheral surface of the tank body. The at least one of the plurality of baffles may be clamped by the inner peripheral surface of the tank body. The plurality of baffles may be connected to each other by a connecting member extending in the axial direction. Baffles located at both ends in the axial direction among the plurality of baffles may be held on the inner peripheral surface of the tank body. An inclined surface inclined with respect to the axial direction may be formed on a surface other than an outer peripheral surface of the baffle held on the inner peripheral surface of the tank body among the plurality of baffles. The plurality of baffles may include a baffle having an outer peripheral surface spaced apart from the inner peripheral surface of the tank body. In order to solve the above-mentioned problem, according to the present disclosure, there is provided a rocket including the above-mentioned liquid tank. In order to solve the above-mentioned problem, according to the present disclosure, there is provided a method of manufacturing a liquid tank, including: installing a plurality of annular baffles inside a cylindrical blank pipe at intervals in an axial direction of the blank pipe; and after installing the plurality of baffles inside the blank pipe, reducing both end portions of the blank pipe in diameter toward respective end sides to form a seamless tank body. Effects of Disclosure According to the present disclosure, a manufacturing process of the liquid tank can be shortened. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic view for illustrating a rocket according to this embodiment. FIG. 2 is a sectional view for illustrating an oxidant tank according to this embodiment. FIG. 3 is an enlarged sectional view for illustrating the oxidant tank according to this embodiment. FIG. 4 is a schematic view for illustrating a state before spinning of a blank pipe of a tank body in this embodiment. FIG. 5 is a schematic view for illustrating a state during spinning of the blank pipe of the tank body in this embodiment. FIG. 6 is a schematic view for illustrating a state after spinning of the blank pipe of the tank body in this embodiment. DESCRIPTION OF EMBODIMENTS An embodiment of the present disclosure is described below with reference to the accompanying drawings. Dimensions, materials, other specific numerical values, and the like described in the embodiment are merely examples for facilitating understanding, and do not limit the present disclosure unless otherwise stated. In this Description and the drawings, elements having substantially the same functions and configurations are denoted by the same reference symbols to omit overlapping description, and elements that are not directly related to the present disclosure are not shown. FIG. 1 is a schematic view for illustrating a rocket 1 according to this embodiment. The rocket 1 is a hybrid rocket. As illustrated in FIG. 1, the rocket 1 includes an oxidan