End device

Abstract

To provide an end part device which achieves downsizing of an outer diameter dimension of an outer tube to reduce a minimum bending radius of a double hose and thereby achieve downsizing of a hose reel for winding storage.SOLUTION: An end part device includes: an inner tube side cylinder member 11 configured to be inserted into the inner periphery side of an inner tube 2; an inner tube side close contact member 12 which is provided at the outer periphery side of the inner tube 2 into which the inner tube side cylinder member 11 is inserted and causes the inner tube 2 to contact tightly with an outer peripheral surface of the inner tube side cylinder member 11; an outer tube side cylinder member 13 provided at the outer periphery side of the inner tube 2 and configured to be inserted into the inner periphery side of an outer tube 3; an outer tube side close contact member 14 which is provided at the outer periphery side of the outer tube 3 into which the outer tube side cylinder member 13 is inserted and causes the outer tube 3 to contact tightly with an outer peripheral surface of the outer tube side cylinder member 13; and a sealing structure 15 which seals a heat insulation layer 4 between the inner tube 2 and the outer tube 3. The inner tube side close contact member 12 is disposed in a portion, protruding from the outer tube side cylinder member 13 to the axial outer side, of the inner tube 2.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an end device attached to an end of a double hose having an inner tube and an outer tube each made of a flexible material.

Background Art

[0002] As a conventional end device, one attached to an end of a double hose having an inner tube and an outer tube each made of a flexible material is known (see, for example, Patent Document 1).

[0003] The double hose to which the end device is attached has a heat insulating layer formed between the inner tube and the outer tube, and is used, for example, to connect a ship at sea and a storage tank on land and transport low-temperature liquids such as liquefied natural gas, liquefied carbon dioxide gas, and liquefied ammonia between the ship and the storage tank.

[0004] The double hose is wound around a hose reel during storage and is used in a state where one end side is pulled out from the hose reel. The minimum bending radius, which is the minimum radius at which the double hose can be bent without breaking, increases in proportion to the size of the outer diameter dimension of the double hose. Therefore, in order to reduce the size of the hose reel for winding and storage, it is required to reduce the outer diameter dimension of the double hose.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Conventional end fittings comprise an inner tube end member attached to the end of the inner tube and an outer tube end member attached to the end of the outer tube, with the outer tube end member positioned radially outward from the inner tube end member. Therefore, in conventional end fittings, the outer diameter of the outer tube is determined by the outer diameter of the outer tube end member positioned radially outward from the inner tube end member, making it difficult to reduce the outer diameter of the outer tube.

[0007] The object of the present invention is to provide an end device that can reduce the minimum bending radius of a double hose and thereby reduce the size of the hose reel for winding and storing the hose by reducing the outer diameter of the outer tube. [Means for solving the problem]

[0008] The end device according to the present invention is an end device attached to the end of a double hose having an inner tube and an outer tube, each made of a flexible material, and comprises: an inner tube side cylindrical member inserted into the inner circumference of the inner tube; an inner tube side contact member provided on the outer circumference of the inner tube into which the inner tube side cylindrical member is inserted, which brings the inner tube into close contact with the outer surface of the inner tube side cylindrical member; an outer tube side cylindrical member provided on the outer circumference of the inner tube and inserted into the inner circumference of the outer tube; an outer tube side contact member provided on the outer circumference of the outer tube into which the outer tube side cylindrical member is inserted, which brings the outer tube into close contact with the outer tube on the outer surface of the outer tube side cylindrical member; and a sealing structure that seals the heat insulating layer between the inner tube and the outer tube, wherein the inner tube side contact member is arranged in the portion of the inner tube that protrudes axially outward from the outer tube side cylindrical member.

[0009] Furthermore, the end device according to the present invention has an inner pipe side contact member having a plurality of contact members whose surfaces that abut against the inner pipe extend in an arc shape, and a plurality of connecting members that connect the ends of adjacent contact members, and is configured in an annular shape, and the outer pipe side contact member having a plurality of contact members whose surfaces that abut against the outer pipe extend in an arc shape, and a plurality of connecting members that connect the ends of adjacent contact members, and is configured in an annular shape.

[0010] Furthermore, the end device according to the present invention is provided with an inner pipe side flange portion on the inner pipe side cylindrical member that extends radially outward in the circumferential direction from a portion located axially outward from the end of the outer pipe, and an outer pipe side flange portion on the outer pipe side cylindrical member that extends radially outward in the circumferential direction from a portion located axially inward from the inner pipe side flange portion, and the sealing structure has a cylindrical closing member that closes the gap between the inner pipe side flange portion and the outer pipe side flange portion in the circumferential direction.

[0011] Furthermore, in the end device according to the present invention, the heat insulating layer has an average thickness dimension of 20 mm or less.

[0012] Furthermore, the double hose according to the present invention has an end device. [Effects of the Invention]

[0013] According to the present invention, the inner pipe side contact member and the outer pipe side contact member are positioned offset from each other in the axial direction of the double hose, making it possible to connect the end device to the end of the double hose. This allows the outer diameter of the outer pipe to be reduced while maintaining the inner diameter of the inner pipe, thereby reducing the minimum bending radius of the double hose and enabling the miniaturization of the hose reel for winding and storing the hose. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a longitudinal cross-sectional view of an end device according to the first embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view of the inner pipe side sealing member and the outer pipe side sealing member according to the first embodiment of the present invention. [Figure 3] Figure 3 is a longitudinal cross-sectional view of an end device according to a second embodiment of the present invention. [Figure 4] Figure 4 is a longitudinal cross-sectional view of an end device according to a third embodiment of the present invention. [Figure 5] Figure 5 is a longitudinal cross-sectional view of an end device according to a fourth embodiment of the present invention. [Modes for carrying out the invention]

[0015] <First Embodiment> Figures 1 and 2 show the first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of the end device (a view cut along the central axis direction of the double hose), and FIG. 2 is a sectional view of the inner pipe side close member and the outer pipe side close member (a view cut along the direction orthogonal to the central axis of the double hose). The dashed-dotted line in FIG. 1 represents the central axis of the double hose, and the lower side of the central axis is omitted because it has a line symmetry relationship with the upper side with respect to the central axis.

[0016] The end device 10 of the present embodiment is attached to the end of a double hose 1 that connects, for example, a ship at sea and a storage tank on land and conveys a low-temperature (for example, -60°C or higher and 0°C or lower) liquid such as liquefied natural gas, liquefied carbon dioxide gas, or liquefied ammonia between the ship and the storage tank.

[0017] The double hose 1 has a cylindrical inner pipe 2 and an outer pipe 3 made of a flexible material respectively. The inner pipe 2 and the outer pipe 3 are each formed by coating a fabric knitted with fibers made of, for example, a polymer compound as the flexible material with an elastomer. The double hose 1 has a heat insulation layer 4 that blocks heat transfer between the inside of the inner pipe 2 and the outside of the outer pipe 3 by forming an air layer or filling a heat insulating material made of non-woven fabric or the like between the inner pipe 2 and the outer pipe 3.

[0018] For the double hose 1, for example, the inner diameter dimension of the inner pipe 2 is 102 mm, the outer diameter dimension of the outer pipe 3 is 130 mm, the thickness dimension of each of the inner pipe 2 and the outer pipe 3 is 4 mm, and the average thickness dimension of the heat insulation layer 4 is 20 mm. Here, the heat insulation layer 4 may have an average thickness dimension of 20 mm or less, and it is preferably configured within a range of, for example, 0.1 mm or more and 20 mm or less.

[0019] The double hose 1 is stored in a state wound around a hose reel and used in a state where one end side is pulled out from the hose reel.

[0020] As shown in Fig. 1, the end device 10 includes an inner tube side cylindrical member 11 inserted into the inner peripheral side of the inner tube 2, an inner tube side close contact member 12 provided on the outer peripheral side of the inner tube 2 into which the inner tube side cylindrical member 11 is inserted and closely contacting the inner tube 2 on the outer peripheral surface of the inner tube side cylindrical member 11, an outer tube side cylindrical member 13 provided on the outer peripheral side of the inner tube 2 and inserted into the inner peripheral side of the outer tube 3, an outer tube side close contact member 14 provided on the outer peripheral side of the outer tube 3 into which the outer tube side cylindrical member 13 is inserted and closely contacting the outer tube 3 on the outer peripheral surface of the outer tube side cylindrical member 13, and a sealing structure 15 for sealing the heat insulation layer 4 between the inner tube 2 and the outer tube 3.

[0021] The inner tube side cylindrical member 11 includes a cylindrical inner tube side cylindrical portion 11a having an outer diameter dimension slightly smaller than the inner diameter dimension of the inner tube 2, and an inner tube side flange portion 11b extending radially outward in the circumferential direction from the axial end of the inner tube side cylindrical portion 11a. The inner tube side cylindrical portion 11a is inserted into the inner peripheral side of the inner tube 2 from the axial end of the inner tube 2. Further, the inner tube side flange portion 11b is fixed by a fastening member such as a bolt in a state of facing the flange portion provided at the end of the pipe connection portion provided on a ship, a storage tank, etc. to which the end of the double hose 1 is connected. Also, a seal member 11b1 for preventing leakage of the conveyed liquid is disposed between the inner tube side flange portion 11b and the flange portion on the connection port side.

[0022] As shown in Fig. 2, the inner tube side close contact member 12 has a plurality of contact members 12a each having a surface contacting the inner tube 2 formed in an arc shape, and a plurality of connecting members 12b connecting the ends of adjacent contact members 12a. The connecting member 12b consists of a bolt 12b1 and a nut 12b2. The inner tube side close contact member 12 is formed in an annular shape by connecting the adjacent ends of the plurality of contact members 12a by the connecting member 12b. The inner tube side close contact member 12 is attached so as to surround the outer peripheral side of the portion of the inner tube 2 into which the inner tube side cylindrical portion 11a is inserted in the circumferential direction, and the inner tube 2 is closely contacted with the outer peripheral surface of the inner tube side cylindrical portion 11a by fastening the ends of adjacent contact members 12a with the connecting member 12b.

[0023] The outer tube side cylindrical member 13 is a cylindrical member having an outer diameter slightly smaller than the inner diameter of the outer tube 3, and an inner diameter smaller than the outer diameter of the inner tube side flange portion 11b and the outer diameter of the inner tube side sealing member 12 attached to the outer circumference of the inner tube 2. The outer tube side cylindrical member 13 is inserted into the inner circumference of the outer tube 3 with the inner tube 2 inserted through its inner circumference.

[0024] The outer pipe side contact member 14 has the same configuration as the inner pipe side contact member 12, and as shown in Figure 2, it has a plurality of contact members 14a, each with an arc-shaped surface that contacts the outer pipe 3, and a plurality of connecting members 14b that connect the ends of adjacent contact members 14a. The connecting members 14b consist of a bolt 14b1 and a nut 14b2. The outer pipe side contact member 14 is formed in an annular shape by connecting the adjacent ends of the plurality of contact members 14a with the connecting members 14b. The outer pipe side contact member 14 is attached so as to surround the outer circumference of the portion of the outer pipe side cylindrical member 13 inserted into the outer pipe 3, and the outer pipe 3 is brought into close contact with the outer surface of the outer pipe side cylindrical member 13 by fastening the ends of adjacent contact members 14a with the connecting members 14b.

[0025] Here, in the double hose 1 to which the end device 10 is attached, the inner tube 2 protrudes axially outward (to the right in Figure 1) from the end of the outer tube 3. The inner tube side contact member 12 is attached to the portion on the outer circumference of the inner tube 2 that protrudes axially outward from the end of the outer tube side cylindrical member 13 attached to the outer tube 3.

[0026] The sealed structure 15 includes a position fixing member 15a for fixing the axial position of the outer tube 3 relative to the inner tube 2 of the double hose 1, and a watertight member 15b disposed on the outer circumference of the position fixing member 15a for preventing seawater from entering the heat insulating layer 4.

[0027] The position fixing member 15a is, for example, an adhesive tape made of a resin film-like material reinforced with glass fibers. The position fixing member 15a is wrapped tightly around the outer tube 3, including the outer tube side contact member 14, from the end of the inner tube 2 to the end of the outer tube 3, thereby fixing the axial position of the outer tube 3 relative to the inner tube 2 of the double hose 1.

[0028] The waterproofing member 15b is a heat-shrinkable tube made of resin, formed into a cylindrical shape, and shrinks when heated. The waterproofing member 15b covers the outer circumference from the end of the inner pipe 2 to the end of the outer pipe 3, including the outer pipe side sealing member 14, thereby blocking the intrusion of seawater from the end of the outer pipe 3 into the insulation layer 4.

[0029] In the end device 10 configured as described above, when attaching it to the end of the double hose 1, first, the outer tube side cylindrical member 13 is positioned on the outer circumference side of the inner tube 2. Then, the inner tube side cylindrical portion 11a of the inner tube side cylindrical member 11 is inserted into the inner tube 2 from the end, and the inner tube side sealing member 12 is attached to the portion of the inner tube side cylindrical portion 11a located on the outer circumference side of the inner tube side cylindrical portion 11a in the inner tube 2. Similarly, the outer tube side cylindrical member 13 is inserted into the outer tube 3 from the end, and the outer tube side sealing member 14 is attached to the portion of the outer tube side cylindrical member 13 located on the outer circumference side of the outer tube side cylindrical member 13 in the outer tube 3. Finally, the position fixing member 15a and the water-blocking member 15b that constitute the sealing structure 15 fix the axial position of the outer tube side cylindrical member 13 with respect to the inner tube side cylindrical member 11, and close the gap between the outer circumference surface of the inner tube 2 and the inner circumference surface of the outer tube side cylindrical member 13 (maintaining watertightness of the space including the gap).

[0030] As described above, the end device 10 of this embodiment is attached to the end of a double hose 1 having an inner tube 2 and an outer tube 3, each made of a flexible material, and comprises an inner tube side cylindrical member 11 inserted into the inner circumference of the inner tube 2, an inner tube side contact member 12 provided on the outer circumference of the inner tube 2 into which the inner tube side cylindrical member 11 is inserted, and which brings the inner tube 2 into close contact with the outer surface of the inner tube side cylindrical member 11, an outer tube side cylindrical member 13 provided on the outer circumference of the inner tube 2 and inserted into the inner circumference of the outer tube 3, an outer tube side contact member 14 provided on the outer circumference of the outer tube 3 into which the outer tube side cylindrical member 13 is inserted, and which brings the outer tube 3 into close contact with the outer surface of the outer tube side cylindrical member 13, and a sealing structure 15 that seals the heat insulating layer 4 between the inner tube 2 and the outer tube 3, wherein the inner tube side contact member 12 is positioned on the portion of the inner tube 2 that protrudes axially outward from the outer tube side cylindrical member 13.

[0031] Furthermore, the double hose 1 of this embodiment is equipped with an end device 10.

[0032] This makes it possible to connect the end device 10 to the end of the double hose 1 with the inner pipe side contact member 12 and the outer pipe side contact member 14 positioned offset from each other in the axial direction of the double hose 1. This allows the outer diameter of the outer pipe 3 to be reduced while maintaining the inner diameter of the inner pipe 2, thereby reducing the minimum bending radius of the double hose 1 and enabling the miniaturization of the hose reel for winding and storing the hose.

[0033] Furthermore, it is preferable that the inner pipe side contact member 12 has a plurality of contact members 12a whose surfaces that abut against the inner pipe 2 extend in an arc shape, and a plurality of connecting members 12b that connect the ends of adjacent contact members 12a, and is configured in an annular shape, and that the outer pipe side contact member 14 has a plurality of contact members 14a whose surfaces that abut against the outer pipe 3 extend in an arc shape, and a plurality of connecting members 14b that connect the ends of adjacent contact members 14a, and is configured in an annular shape.

[0034] As a result, the multiple contact members 12a bring the inner tube 2 into close contact with the outer surface of the inner tube side cylindrical member 11 in the circumferential direction, and the multiple contact members 14a bring the outer tube 3 into close contact with the outer surface of the outer tube side cylindrical member 13 in the circumferential direction. This suppresses leakage of the transported liquid from between the inner tube 2 and the inner tube side cylindrical member 11, and also suppresses the intrusion of seawater from between the outer tube 3 and the outer tube side cylindrical member 13.

[0035] Furthermore, it is preferable that the average thickness of the insulation layer 4 is 20 mm or less.

[0036] This prevents the outer diameter of the double hose 1 of the inner tube 2 from becoming unnecessarily large, making it possible to make the hose reel for winding and storing smaller.

[0037] In the first embodiment, the sealed structure 15 was shown to consist of a position fixing member 15a for fixing the axial position of the outer pipe 3 relative to the inner pipe 2 of the double hose 1, and a watertight member 15b for preventing seawater from entering the heat insulation layer 4, but it is not limited to this. As long as it is possible to fix the axial position of the outer pipe 3 relative to the inner pipe 2 and prevent seawater from entering the heat insulation layer 4, the sealed structure may be made only of a watertight member made of heat shrink tubing, for example.

[0038] <Second Embodiment> Figure 3 shows a second embodiment of the present invention and is a longitudinal cross-sectional view of the end device. Components similar to those in the previous embodiment are denoted by the same reference numerals.

[0039] The inner tube side cylindrical member 11 of the end device 10 in this embodiment has a cylindrical inner tube side cylindrical portion 11a having an outer diameter slightly smaller than the inner diameter of the inner tube 2, an inner tube side flange portion 11b extending radially outward in the circumferential direction from the end of the inner tube side cylindrical portion 11a, and an inner tube side flange portion 11c for closing member that is spaced apart from the inner tube side flange portion 11b on the inner tube side cylindrical portion 11a and extends radially outward in the circumferential direction. The outer diameter of the inner tube side flange portion 11c for closing member is formed to be larger than the outer diameter of the inner tube side flange portion 11b.

[0040] Furthermore, the outer tube side cylindrical member 13 of this embodiment has an outer diameter slightly smaller than the inner diameter of the outer tube 3, and consists of a cylindrical outer tube side cylindrical portion 13a having an inner diameter smaller than the outer diameter of the inner tube side flange portion 11b and the inner tube side flange portion 11c for the closing member of the inner tube side cylindrical member 11, and the outer diameter of the inner tube side contact member 12 attached to the outer circumference of the inner tube 2, and an outer tube side flange portion 13b for the closing member that extends radially outward in the circumferential direction from the axial end of the outer tube side cylindrical portion 13a. The outer diameter of the outer tube side flange portion 13b for the closing member is formed to be larger than the inner tube side flange portion 11c for the closing member of the inner tube side cylindrical member 11.

[0041] Furthermore, the sealing structure 15 of this embodiment has a closing member 15c that closes the gap between the inner pipe side flange portion 11c for the closing member of the inner pipe side cylindrical member 11 and the outer pipe side flange portion 13b for the closing member of the outer pipe side cylindrical member 13 in the circumferential direction.

[0042] The closing member 15c has a cylindrical main body portion 15c1, a first flange portion 15c2 extending inward from one end of the main body portion 15c1 in the circumferential direction, and a second flange portion 15c3 extending outward from the other end of the main body portion 15c1 in the circumferential direction.

[0043] The first flange portion 15c2 is fastened to the inner pipe side flange portion 11c for the closing member of the inner pipe side cylinder member 11 by bolts 15e, with the first flange portion 15c2 facing the inner pipe side flange portion 11c for the closing member circumferentially via a ring-shaped sealing member 15d. As a result, the flow of seawater is blocked between the first flange portion 15c2 and the inner pipe side flange portion 11c for the closing member.

[0044] The second flange portion 15c3 is fastened to the outer pipe side flange portion 13b for the closing member of the outer pipe side cylindrical member 13 by a bolt 15g, with the second flange portion 15c3 facing the outer pipe side flange portion 13b for the closing member circumferentially via a ring-shaped sealing member 15f. As a result, the flow of seawater is blocked between the second flange portion 15c3 and the outer pipe side flange portion 13b for the closing member.

[0045] In the end device 10 configured as described above, when attaching it to the end of the double hose 1, first, the outer pipe side cylindrical member 13 is positioned on the outer circumference side of the inner pipe 2. Then, the inner pipe side cylindrical portion 11a of the inner pipe side cylindrical member 11 is inserted into the inner pipe 2 from the end, and the inner pipe side sealing member 12 is attached to the portion of the inner pipe side cylindrical portion 11a located on the outer circumference side of the inner pipe side cylindrical portion 11a in the inner pipe 2. In addition, the outer pipe side cylindrical portion 13a of the outer pipe side cylindrical member 13 is inserted into the outer pipe 3 from the end, and the outer pipe side sealing member 14 is attached to the portion of the outer pipe side cylindrical portion 13a located on the outer circumference side of the outer pipe side cylindrical portion 13a in the outer pipe 3. Finally, the first flange portion 15c2 of the closing member 15c constituting the sealed structure 15 is fastened to the inner pipe side flange portion 11c for the closing member, and the second flange portion 15c3 is fastened to the outer pipe side flange portion 13b for the closing member, thereby fixing and stabilizing the position of the outer pipe side cylinder member 13 with respect to the inner pipe side cylinder member 11, and closing the gap between the outer circumferential surface of the inner pipe 2 and the inner circumferential surface of the outer pipe side cylinder member 13.

[0046] Thus, with the end device 10 of this embodiment, similar to the first embodiment, the inner pipe side contact member 12 and the outer pipe side contact member 14 are positioned offset from each other in the axial direction of the double hose 1, making it possible to connect the end device 10 to the end of the double hose 1. This makes it possible to reduce the outer diameter of the outer pipe 3 while maintaining the inner diameter of the inner pipe 2, thereby reducing the minimum bending radius of the double hose 1 and enabling miniaturization of the hose reel for winding and storing the hose.

[0047] Furthermore, it is preferable that the inner tube side cylindrical member 11 is provided with an inner tube side flange portion 11c for a closing member that extends radially outward in the circumferential direction from a portion located axially outward from the end of the outer tube 3, and the outer tube side cylindrical member 13 is provided with an outer tube side flange portion 13b for a closing member that extends radially outward in the circumferential direction from a portion located axially inward (left side in Figure 3) from the inner tube side flange portion 11c, and the sealing structure 15 has a cylindrical closing member 15c that closes the gap between the inner tube side flange portion 11c and the outer tube side flange portion 13b for a closing member in the circumferential direction.

[0048] As a result, the closing member 15c prevents seawater from entering the heat insulating layer 4, and also fixes and stabilizes the position of the outer pipe-side cylindrical member 13 relative to the inner pipe-side cylindrical member 11. Therefore, since there is no need for a special part to fix the outer pipe-side cylindrical member 13 to the inner pipe-side cylindrical member 11, it is possible to reduce manufacturing costs.

[0049] <Third Embodiment> Figure 4 shows a third embodiment of the present invention and is a longitudinal cross-sectional view of the end device. Components similar to those in the previous embodiments are denoted by the same reference numerals.

[0050] In this embodiment, the end device 10 has an outer diameter dimension of the inner pipe side flange portion 11c for the closing member of the inner pipe side cylindrical member 11 that is the same as the outer diameter dimension of the inner pipe side flange portion 11b in the second embodiment. That is, the closing member 15c has a first flange portion 15cc2 that is held movably between the inner pipe side flange portion 11b of the inner pipe side cylindrical member 11 and the inner pipe side flange portion 11c for the closing member, and is not removable from the inner pipe side cylindrical member 11, so it is configured as a single part together with the inner pipe side cylindrical member 11. Furthermore, the outer diameter dimension of the outer pipe side flange portion 13b for the closing member of the outer pipe side cylindrical member 13 is formed to be larger than the outer diameter dimension of the inner pipe side flange portion 11c for the closing member of the inner pipe side cylindrical member 11.

[0051] In this embodiment, the outer diameter dimensions of the inner pipe side flange portion 11c for the closing member of the inner pipe side cylindrical member 11 and the outer pipe side flange portion 13b for the closing member of the outer pipe side cylindrical member 13 can be made smaller compared to the second embodiment.

[0052] In the end device 10 configured as described above, similar to the second embodiment, it is attached to the end of the double hose 1, fixing and stabilizing the position of the outer tube side cylindrical member 13 relative to the inner tube side cylindrical member 11, and closing the gap between the outer circumferential surface of the inner tube 2 and the inner circumferential surface of the outer tube side cylindrical member 13.

[0053] Thus, with the end device 10 of this embodiment, similar to the first embodiment, the inner pipe side contact member 12 and the outer pipe side contact member 14 are positioned offset from each other in the axial direction of the double hose 1, making it possible to connect the end device 10 to the end of the double hose 1. This makes it possible to reduce the outer diameter of the outer pipe 3 while maintaining the inner diameter of the inner pipe 2, thereby reducing the minimum bending radius of the double hose 1 and enabling miniaturization of the hose reel for winding and storing the hose.

[0054] <Fourth Embodiment> Figure 5 shows a fourth embodiment of the present invention and is a longitudinal cross-sectional view of the end device. Components similar to those in the previous embodiments are denoted by the same reference numerals.

[0055] The inner pipe side cylindrical member 11 of the end device 10 in this embodiment, similar to the first embodiment, consists of a cylindrical inner pipe side cylindrical portion 11a having an outer diameter slightly smaller than the inner diameter of the inner pipe 2, and an inner pipe side flange portion 11b extending radially outward in the circumferential direction from the axial end of the inner pipe side cylindrical portion 11a. The inner pipe side flange portion 11b of the inner pipe side cylindrical member 11 is fixed by bolts 22 in a position facing the flange portion 21 provided on the hose side end of the connecting member 20, which is responsible for detachable connection to the end of the double hose 1 with the end of the piping provided on a ship, storage tank, etc., to which the end of the double hose 1 is connected. In addition, a sealing member 11b1 is arranged between the inner pipe side flange portion 11b and the flange portion 21 of the connecting member 20 to prevent leakage of the liquid being transported.

[0056] Furthermore, the outer tube side cylindrical member 13 of this embodiment, similar to the second embodiment, consists of an outer tube side cylindrical portion 13a and an outer tube side flange portion 13b for the closing member. The outer tube side cylindrical portion 13a has an inner diameter smaller than the outer diameter of the inner tube side flange portion 11b of the inner tube side cylindrical member 11 and the outer diameter of the inner tube side contact member 12 attached to the outer circumference of the inner tube 2. The outer tube side flange portion 13b for the closing member has an outer diameter larger than the outer diameter of the flange portion 21 of the connecting member 20.

[0057] Furthermore, the sealing structure 15 of this embodiment includes a closing member 15h that closes the gap between the inner pipe side flange portion 11b of the inner pipe side cylindrical member 11 and the outer pipe side flange portion 13b for the closing member of the outer pipe side cylindrical member 13 in the circumferential direction.

[0058] The closing member 15h has a cylindrical main body portion 15h1 and a flange portion 15h2 that extends radially outward in the circumferential direction from the end of the main body portion 15h1 on the outer pipe side flange portion 13b for the closing member.

[0059] The closing member 15h is formed integrally with the flange portion 21 by welding the end of the main body portion 15h1 on the inner pipe side flange portion 11b to the radially outer side of the flange portion 21 of the connecting member 20, for example, in the circumferential direction. As a result, the flow of seawater is blocked between the main body portion 15h1 and the flange portion 21.

[0060] The flange portion 15h2 is fastened to the outer pipe side flange portion 13b for the closing member of the outer pipe side cylindrical member 13 by a bolt 15j, with the flange portion 15h2 facing the outer pipe side flange portion 13b for the closing member circumferentially via a ring-shaped sealing member 15i. As a result, the flow of seawater is blocked between the flange portion 15h2 and the outer pipe side flange portion 13b for the closing member.

[0061] In the end device 10 configured as described above, similar to the second and third embodiments, it is attached to the end of the double hose 1, and the closing member 15h fixes and stabilizes the position of the outer tube side cylinder member 13 relative to the inner tube side cylinder member 11, and closes the gap between the outer circumferential surface of the inner tube 2 and the inner circumferential surface of the outer tube side cylinder member 13.

[0062] Thus, with the end device 10 of this embodiment, similar to the first embodiment, the inner pipe side contact member 12 and the outer pipe side contact member 14 are positioned offset from each other in the axial direction of the double hose 1, making it possible to connect the end device 10 to the end of the double hose 1. This makes it possible to reduce the outer diameter of the outer pipe 3 while maintaining the inner diameter of the inner pipe 2, thereby reducing the minimum bending radius of the double hose 1 and enabling miniaturization of the hose reel for winding and storing the hose.

[0063] In the above embodiment, the flexible material constituting the inner tube 2 and outer tube 3 of the double hose 1 was shown to be formed by covering a fabric made of woven fibers of a polymer compound with an elastomer, but it is not limited to this. The flexible material constituting the inner tube 2 and outer tube 3 can be any material that has durability against the temperature and pressure of the liquid being conveyed, as well as flexibility to withstand repeated bending. For example, it may be a material made solely of synthetic resin, or a material containing natural rubber. Furthermore, flexible metal bellows tubes are not preferred as flexible materials constituting the inner tube 2 and outer tube 3 from the viewpoint of mechanical properties and manufacturing costs.

[0064] Furthermore, in the above embodiment, the fluid transported by the double hose 1 was shown to be a low-temperature liquid such as liquefied natural gas, liquefied carbon dioxide, or liquefied ammonia. However, it is also possible to transport liquids or gases at temperatures above 0°C, as long as the temperature is below the heat resistance temperature of the inner pipe. The double hose has an insulating layer, which is particularly advantageous when there is a large difference between the temperature of the fluid being transported and the temperature of the location where the double hose is installed. [Explanation of Symbols]

[0065] 1. Double hose 2 Inner tube 3 outer tube 4. Insulation layer 10 End device 11 Inner tube side cylindrical member 11c Inner pipe side flange portion for closing member 12 Inner pipe side sealing member 12a Contact member 12b Connecting member 13 Outer pipe side cylinder member 13b Outer pipe side flange portion for closing member 14. Outer tube side sealing member 14a Contact member 14b Connecting member 15 Sealed structure 15c, 15h Closure member

Claims

1. An end device attached to the end of a double hose having an inner tube and an outer tube, each made of a flexible material, An inner tube side cylindrical member inserted into the inner circumference of the inner tube, An inner tube side contact member is provided on the outer circumference side of the inner tube into which the inner tube side cylindrical member is inserted, and the inner tube side contact member is brought into close contact with the outer circumference surface of the inner tube side cylindrical member, An outer tube side cylindrical member provided on the outer circumference side of the inner tube and inserted into the inner circumference side of the outer tube, An outer tube side contact member is provided on the outer circumference side of the outer tube into which the outer tube side cylindrical member is inserted, and the outer tube side contact member is brought into close contact with the outer tube on the outer circumference surface of the outer tube side cylindrical member, It comprises a sealing structure that seals the heat insulating layer between the inner tube and the outer tube, The inner tube side contact member is positioned in the portion of the inner tube that protrudes axially outward from the outer tube side cylindrical member. End device.

2. The inner pipe side contact member comprises a plurality of contact members whose surfaces that abut the inner pipe extend in an arc shape, and a plurality of connecting members that connect the ends of adjacent contact members, and is configured in an annular shape. The outer tube side contact member comprises a plurality of contact members whose surfaces that abut the outer tube extend in an arc shape, and a plurality of connecting members that connect the ends of adjacent contact members, and is configured in an annular shape. The end device according to claim 1.

3. The inner tube side cylindrical member is provided with an inner tube side flange portion that extends radially outward in the circumferential direction from a portion located axially outward from the end of the outer tube, The outer tube side cylindrical member is provided with an outer tube side flange portion that extends radially outward in the circumferential direction from a portion located axially inward from the inner tube side flange portion, The sealing structure has a cylindrical closing member that closes the gap between the inner pipe flange and the outer pipe flange in the circumferential direction. The end device according to claim 1.

4. The aforementioned insulation layer has an average thickness of 20 mm or less. The end device according to claim 1.

5. Having an end device according to any one of claims 1 to 4 Double hose.

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