Connection structure for pressure vessels, tank module including the same, and manufacturing method of tank module
A connection structure for pressure vessels is configured such that respective mouth pieces are connected to at least one ends of the pressure vessels, and when adjacent mouth pieces are connected to each other in an intersection direction intersecting with the axial direction, the pressure vessels placed in parallel can be connected to each other. The mouth piece includes a connecting portion along the intersection direction intersecting with the axial direction. The connecting portion includes an external screw thread portion formed on a first side thereof, and a nut rotatably locked to a second side thereof and having an internal screw thread portion threadedly engageable with the external screw thread portion.
1. A connection structure for pressure vessels, the connection structure comprising:
a first mouth piece connected to at least one end of a tubular first pressure vessel in an axial direction;
a second mouth piece connected to at least one end of a tubular second pressure vessel in the axial direction; and
a nut, wherein:
the first mouth piece includes a first penetration passage extending in an intersection direction intersecting with the axial direction, and a first communicating passage configured to connect the first penetration passage to an inside of a first body portion of the first pressure vessel;
the second mouth piece includes a second penetration passage extending in the intersection direction intersecting with the axial direction, and a second communicating passage configured to connect the second penetration passage to an inside of a second body portion of the second pressure vessel;
the first mouth piece includes an external screw thread portion provided on a first outer wall portion of the first penetration passage; and
the nut is rotatably locked to a second outer wall portion of the second penetration passage of the second mouth piece and is threadedly engaged with the external screw thread portion of the first mouth piece so as to connect the first mouth piece and the second mouth piece to each other in the intersection direction.
2. The connection structure according to claim 1 , wherein
the first mouth pieces are connected to both ends of the first body portion of the first pressure vessel; and
the second mouth pieces are connected to both ends of the second body portion of the second pressure vessel.
3. The connection structure according to claim 1 , wherein a sealing member surrounding the first penetration passage is provided on an abutting surface between the first mouth piece and the second mouth piece.
4. The connection structure according to claim 1 , wherein
the first mouth piece includes a first tapered surface provided around the first penetration passage of the first mouth piece; and
the second mouth piece includes a second tapered surface provided around the second penetration passage of the second mouth piece so as to abut with the first tapered surface.
5. A tank module comprising the connection structure according to claim 1 , wherein the pressure vessels placed in parallel are connected to each other continuously by the first and second mouth pieces.
6. A manufacturing method of the tank module according to claim 5 , the manufacturing method comprising:
a process of connecting the first mouth piece to the first body portion of the first pressure vessel;
a process of connecting the second mouth piece to the second body portion of the second pressure vessel placed in parallel with the first pressure vessel; and
a process of connecting the first mouth piece to the second mouth piece.