Valve assembly jig and valve assembly assembly method

Abstract

To provide an assembling jig for a valve assembly that can restrain damage to a seal part when a fastening part of the valve assembly is fastened to a mouthpiece part, and an assembling method for the valve assembly.SOLUTION: An assembling jig 1 comprises a first jig 30 to be fixed to the outside of a mouthpiece part 12, and a second jig 40 to be fitted to the outside of the first jig 30. The first jig 30 comprises a first body 31, a first through hole 31h, and an outer peripheral surface 360 that is an annular surface. The second jig 40 comprises a second body 41, a second through hole 41h, an inner peripheral surface 410h that is a sliding surface, and a plurality of guide rods 44. The guide rods 44 are arranged concentrically with respect to a second central axis L20 of the second through hole 41h, and parallel to the second central axis L20. The guide rods 44 can be inserted into insertion holes 25 provided in a housing 21 concentrically with respect to a central axis L2 of a fastening part 23.SELECTED DRAWING: Figure 1

Description

Technical Field

[0006] , , , , ,

[0001] The present invention relates to an assembling jig for a valve assembly and a method for assembling a valve assembly.

Background Art

[0002] Conventionally, as disclosed in Patent Document 1, a high-pressure tank as a container filled with a fuel gas such as hydrogen is known. The high-pressure tank has a base portion at an end of the main body. The base portion has an internal thread on its inner peripheral surface. As disclosed in Patent Document 1, the valve assembly is fastened to the base portion of the high-pressure tank. The valve assembly has a metal housing. The valve assembly incorporates a high-pressure valve in the housing.

[0003] The housing of the valve assembly includes a screw fastening portion. The screw fastening portion is a male screw provided for fastening the valve assembly to the base portion. The valve assembly has a seal portion. The seal portion is provided at an end portion or a tip portion of the screw fastening portion.

[0004] The male screw of the screw fastening portion of the valve assembly is fastened to the female screw of the base portion. By this fastening, the valve assembly is attached to the base portion. The seal portion contacts the inner peripheral surface of the base portion. This contact exhibits a sealing function for sealing the fuel gas in the high-pressure tank.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When fastening the threaded portion of the valve assembly to the valve nozzle, there is a risk of damage to the seal portion of the valve assembly if it comes into contact with the female thread of the valve nozzle. [Means for solving the problem]

[0007] A valve assembly assembly jig for solving the above problems fastens the female thread of a high-pressure tank having a female thread in the nozzle portion and the male thread of a valve assembly having a housing in which a valve is housed and a fastening portion protruding from the housing having a male thread, thereby sealing the space between the nozzle portion and the fastening portion by a seal portion positioned at the tip of the fastening portion beyond the male thread in the axial direction extending along the central axis of the fastening portion, and comprises a first jig fixed to the outside of the nozzle portion and a second jig attached to the outside of the first jig, wherein the first jig comprises a first body, a first through hole penetrating the first body and through which the nozzle portion can be inserted, and the first central axis of the first through hole The gist of the invention is that the first jig has an annular surface provided concentrically on the outer surface of the first body, the second jig has a second body, a second through hole penetrating the second body, a sliding surface defining the second through hole and slidable relative to the annular surface in the circumferential direction of the annular surface, and a plurality of guide rods arranged concentrically with respect to the second central axis of the second through hole and parallel to the second central axis, and the gist of the invention is that the first jig is fixed to the outside of the mouth part, and the second jig is attached to the outside of the first jig so that the sliding surface is slidable relative to the annular surface, the annular surface and the sliding surface are arranged concentrically with respect to the central axis of the female screw, and the guide rods can be inserted into insertion parts provided in the housing concentrically with respect to the central axis of the fastening part.

[0008] According to this method, by inserting the guide rod into the insertion hole, the central axis of the fastening part and the central axis of the female thread can be aligned. Then, when the valve assembly is moved along the guide rod, the fastening part is inserted into the nozzle of the high-pressure tank with the central axes of the fastening part and the female thread aligned. As a result, coaxiality of the nozzle, the first jig, the second jig, and the valve assembly can be ensured, so when inserting and fastening the fastening part into the nozzle, the seal attached to the fastening part is less likely to interfere with the female thread of the nozzle. Therefore, by using the assembly jig, damage to the seal when fastening the fastening part of the valve assembly to the nozzle can be suppressed.

[0009] With respect to the assembly jig for the valve assembly, the first jig may be divisible into two first body forming bodies in a direction perpendicular to the first central axis. According to this, after fastening the valve assembly's fastening portion to the nozzle portion, the valve assembly's housing prevents the first jig from moving in the axial direction. At this point, the first jig can be removed from the nozzle portion by dividing it into two first body forming bodies.

[0010] Regarding the assembly jig for the valve assembly, the first jig has a mounting groove in the first body for mounting the second jig, and the mounting groove may be defined by the sliding surface and two opposing surfaces that sandwich the sliding surface in the axial direction of the first body.

[0011] According to this, when the second jig is mounted in the mounting groove of the first jig, the movement of the second jig in the axial direction of the first jig is restricted by two opposing surfaces. Therefore, the operator can easily rotate the second jig and also easily move the valve assembly toward the nozzle.

[0012] With respect to the assembly jig for the valve assembly, the second jig may be divisible into two second body forming bodies. According to this, the movement of the second jig in the axial direction of the jaw portion is restricted by the two opposing surfaces. By dividing the second jig into two second body forming bodies, the second jig can be removed from the mounting groove.

[0013] A valve assembly assembly assembly method for solving the above problem is a method for assembling a valve assembly to the nozzle portion, wherein the female thread of a high-pressure tank having a female thread in the nozzle portion fastens the male thread of a valve assembly having a housing in which a valve is housed and a fastening portion protruding from the housing, and the valve assembly is assembled to the nozzle portion with a seal portion located at the tip of the fastening portion beyond the male thread in the axial direction extending from the central axis of the fastening portion, wherein the assembly jig described in claim 1 or claim 2 is used, and the outside of the nozzle portion The process includes: a first step of fixing the first jig to the first jig; a second step of attaching the second jig to the first jig so that the sliding surface can slide against the annular surface; a third step of attaching the guide rod to the second jig and then inserting the guide rod into the insertion portion of the housing; a fourth step of moving the valve assembly along the guide rod and inserting the fastening portion into the nozzle portion until the male thread of the fastening portion contacts the female thread of the nozzle portion; and a fifth step of rotating the valve assembly around the central axis of the fastening portion as the center of rotation, thereby screwing the male thread into the female thread.

[0014] According to this, by performing the first, second, and third steps, the central axis of the fastening part and the central axis of the female thread can be aligned. Then, in the fourth step, by moving the valve assembly along the guide rod, the valve assembly can be moved while the central axis of the fastening part and the central axis of the female thread are aligned. Furthermore, in the fifth step, the guide rod allows the fastening part to be screwed into the female thread while the central axis of the fastening part and the central axis of the female thread are aligned. Therefore, by using the assembly jig, damage to the seal part when fastening the fastening part of the valve assembly to the nozzle can be suppressed.

[0015] The method for assembling the valve assembly may further include a sixth step in which, after removing the guide rod, the first jig, and the second jig from the nozzle portion, the valve assembly is further rotated around the central axis of the fastening portion as the center of rotation, thereby tightening the fastening portion to the nozzle portion.

[0016] According to this, in the sixth step, the fastening part can be fully tightened to the mouthpiece. Therefore, when inserting the fastening part into the mouthpiece and fastening it, the fastening part can be fixed to the mouthpiece in a way that the seal attached to the fastening part is less likely to interfere with the female thread of the mouthpiece.

[0017] Regarding the method of assembling the valve assembly, if there is a gap between the outer circumferential surface of the nozzle portion and the surface of the first body that defines the first through hole, in the first step, the position adjustment member may be inserted into the gap and then the first jig may be fixed to the outside of the nozzle portion.

[0018] According to this, the relative position between the nozzle and the first jig can be adjusted by inserting a position adjustment member into the gap. As a result, the female thread of the nozzle and the first through hole can be positioned coaxially, and the first jig can be fixed to the outside of the nozzle. Therefore, even if a gap is formed between the outer surface of the nozzle and the surface of the first body that defines the first through hole, when the fastening part is positioned facing the nozzle using the assembly jig, the central axis of the nozzle and the central axis of the female thread can be aligned. [Effects of the Invention]

[0019] According to the present invention, damage to the seal portion when fastening the fastening portion of the valve assembly to the nozzle portion can be suppressed. [Brief explanation of the drawing]

[0020] [Figure 1] This is a partially fractured cross-sectional view showing an assembly jig for a valve assembly. [Figure 2] This is an exploded perspective view showing the assembly jig for the valve assembly and the valve assembly itself. [Figure 3] It is a cross-sectional view showing the first jig. [Figure 4] It is a cross-sectional view showing a state where a guide rod is inserted into the insertion hole of the housing. [Figure 5] It is a partial perspective view showing a state where the second jig is attached to the first jig. [Figure 6] It is a cross-sectional view showing a state where the male thread of the fastening part contacts the female thread of the base part. [Figure 7] It is a cross-sectional view showing a state where the first jig, the second jig, and the guide rod are removed. [Figure 8] It is a cross-sectional view showing the valve assembly attached to the base part. [Figure 9] It is a cross-sectional view showing the gap between the outer peripheral surface of the base part and the inner peripheral surface of the first body. [Figure 10] It is a front cross-sectional view of a state where the female thread and the first through hole are displaced. [Figure 11] It is a cross-sectional view showing a state where the position is adjusted by the position adjusting member. [Figure 12] It is a partial perspective view showing the position adjusting member. [Figure 13] It is a front cross-sectional view where the central axis of the female thread and the first through hole are coaxial. [Figure 14] It is a cross-sectional view showing another example where the guide rod is thickened.

Mode for Carrying Out the Invention

[0021] Hereinafter, an embodiment of an assembling jig for a valve assembly and an assembling method for a valve assembly will be described according to FIGS. 1 to 8. First, the high-pressure tank of the present embodiment will be described.

[0022] <High-pressure tank> As shown in FIG. 1, the high-pressure tank 10 has a substantially cylindrical tank main body portion 11 and a base portion 12. Inside the high-pressure tank 10, for example, hydrogen gas as fuel gas is filled. Note that, inside the high-pressure tank 10, for example, compressed gas or liquefied gas other than fuel gas may be filled.

[0023] The tank body 11 has an inner shell 11a and an outer shell 11b. The inner shell 11a has gas barrier properties. The outer shell 11b covers the outside of the inner shell 11a. Therefore, the tank body 11 has a two-layer structure. The high-pressure tank 10 has a filling space S1 inside the tank body 11. Hydrogen gas is filled into the filling space S1.

[0024] The nozzle portion 12 is made of metal. The nozzle portion 12 is made of stainless steel, for example. The nozzle portion 12 is substantially cylindrical. The nozzle portion 12 is provided at the axial end of the tank body portion 11. The nozzle portion 12 defines a circular through hole 12h. The nozzle portion 12 has a female thread 13 and a sealing surface 14. The female thread 13 is provided on the surface of the nozzle portion 12 that defines the through hole 12h. The valve assembly 20 is screwed into the female thread 13. The sealing surface 14 is located closer to the interior of the tank body portion 11 than the female thread 13 of the nozzle portion 12. The sealing surface 14 is a cylindrical surface.

[0025] The valve assembly 20 is screwed into the high-pressure tank 10 via the female thread 13 of the nozzle portion 12. This fastens the valve assembly 20 to the nozzle portion 12 in a detachable manner. Hydrogen gas is then supplied to the inside of the high-pressure tank 10 from a hydrogen supply source (not shown) via the valve assembly 20.

[0026] <Valve Assembly> As shown in Figures 1 and 2, the valve assembly 20 includes a housing 21, a valve 22, a fastening portion 23, a male thread 24, and a nozzle 28.

[0027] The housing 21 is plate-shaped. The housing 21 has two through holes 25. Each through hole 25 is circular. Each through hole 25 penetrates the housing 21 in the thickness direction. The center points of the two through holes 25 pass through a virtual circle C. The virtual circle C is a circle whose diameter is the straight line connecting the center points of the two through holes 25. A guide rod 44 provided by the assembly jig 1, which will be described later, can be inserted into each through hole 25.

[0028] Valve 22 is built into the housing 21. Valve 22 is an electromagnetic on / off valve. Valve 22 opens and closes the through hole 12h of the nozzle portion 12. In other words, valve 22 switches between an open state and a closed state. In the open state, valve 22 connects the inside and outside of the high-pressure tank 10. In the closed state, valve 22 blocks the inside and outside of the high-pressure tank 10. Valve 22 is in the open state when filling the filling space S1 of the high-pressure tank 10 with hydrogen gas. Valve 22 is in the closed state when the filling of the filling space S1 of the high-pressure tank 10 with hydrogen gas is complete.

[0029] The fastening portion 23 is substantially cylindrical in shape. The fastening portion 23 protrudes from the central part of the housing 21. The axial direction of the fastening portion 23 coincides with the thickness direction of the housing 21. The male thread 24 protrudes radially beyond the outer circumferential surface 230 of the fastening portion 23. The male thread 24 is screwed into the female thread 13 of the mouth portion 12. In the axial direction of the fastening portion 23, the male thread 24 is positioned closer to the housing 21 than the tip 23a of the fastening portion 23.

[0030] When viewing the valve assembly 20 in the thickness direction of the housing 21, the virtual circle C is a concentric circle centered on the central axis L2 of the fastening portion 23. Therefore, each insertion hole 25 can be said to be an insertion portion provided in the housing 21 in a concentric manner with respect to the central axis L2 of the fastening portion 23.

[0031] A accommodating groove 26 is formed in the fastening portion 23. The accommodating groove 26 is a groove that extends along the entire length of the fastening portion 23 in the circumferential direction. The accommodating groove 26 is positioned closer to the tip 23a of the fastening portion 23 than the male screw 24 in the axial direction of the fastening portion 23. An O-ring 27 is fitted into the accommodating groove 26 as a sealing portion. Note that the sealing portion may be other sealing rings such as V-rings in addition to the O-ring 27.

[0032] The O-ring 27 is made of resin. The axis of the O-ring 27 is located on the central axis L2 of the fastening portion 23. The O-ring 27 can be said to be a concentric circle centered on the central axis L2 of the fastening portion 23. The O-ring 27 sits on the sealing surface 14 of the nozzle portion 12 when the valve assembly 20 is screwed into the nozzle portion 12. In this way, the O-ring 27 axially seals the space between the sealing surface 14 of the nozzle portion 12 and the outer circumferential surface 230 of the fastening portion 23.

[0033] The nozzle 28 protrudes from the tip 23a of the fastening portion 23. The nozzle 28 communicates the inside of the high-pressure tank 10 and the valve 22 via the fastening portion 23. When assembling the valve assembly 20 described above to the nozzle portion 12 of the high-pressure tank 10, the assembly jig 1 is used. The assembly jig 1 will be described below.

[0034] <Assembly Jig> As shown in Figures 1 and 2, the assembly jig 1 includes a first jig 30 and a second jig 40. The first jig 30 and the second jig 40 are made of, for example, carbon steel (e.g., S45C as specified in JIS G 4051:2018). The entire surface of the first jig 30 and the entire surface of the second jig 40 are plated. One example of the plating treatment is hard chromium plating. As a result, a plating layer (not shown) is formed on the surface of the first jig 30 and the surface of the second jig 40.

[0035] The first jig 30 is fixed to the outside of the mouthpiece portion 12. The first jig 30 has a first body 31, a first through hole 31h, and a mounting groove 36. The first body 31 is substantially cylindrical. The first body 31 has a large-diameter portion 32, a small-diameter portion 33, and a mounting groove 36. The outer diameter of the large-diameter portion 32 is larger than the outer diameter of the small-diameter portion 33. The inner diameter of the large-diameter portion 32 is the same as the inner diameter of the small-diameter portion 33. The axis of the large-diameter portion 32 coincides with the axis of the small-diameter portion 33. The large-diameter portion 32 has a mounting hole 32h. The mounting hole 32h penetrates the large-diameter portion 32 in the thickness direction. The mounting hole 32h is a female screw hole. The large-diameter portion 32 has a first end face 31a at the first end in the axial direction of the first body 31, and a second end face 31b at the second end in the axial direction of the first body 31. The first end face 31a and the second end face 31b are each annular surfaces perpendicular to the axis of the first body 31.

[0036] The first body 31 has a restrictive projection 33c at its tip beyond the small diameter portion 33. The restrictive projection 33c protrudes annularly from the inner circumferential surface 361 of the small diameter portion 33. The restrictive projection 33c is located on the opposite side of the large diameter portion 32 in the axial direction of the first body 31. The restrictive projection 33c is located away from the large diameter portion 32 in the axial direction of the first body 31. The inner diameter of the restrictive projection 33c is smaller than the outer diameter of the nozzle portion 12 and is the same as the inner diameter of the nozzle portion 12. However, as long as the inner diameter of the restrictive projection 33c is smaller than the outer diameter of the nozzle portion 12, it may be larger or smaller than the inner diameter of the nozzle portion 12.

[0037] The first body 31 has a flange 33a at its tip beyond the small-diameter portion 33. The flange 33a protrudes annularly from the outer circumferential surface 360 ​​of the small-diameter portion 33. The flange 33a is located on the opposite side of the large-diameter portion 32 in the axial direction of the first body 31. The flange 33a is separated from the large-diameter portion 32 in the axial direction of the first body 31. The outer diameter of the flange 33a is smaller than the outer diameter of the large-diameter portion 32. However, the outer diameter of the flange 33a may be greater than or equal to the outer diameter of the large-diameter portion 32.

[0038] The flange 33a has groove-forming surfaces 33b on the large-diameter portion 32 side of both axial ends of the first body 31. The groove-forming surface 33b is an annular surface perpendicular to the axis of the first body 31. The groove-forming surface 33b faces the second end surface 31b of the large-diameter portion 32 in the axial direction of the first body 31. Therefore, the groove-forming surface 33b and the second end surface 31b are two opposing surfaces that sandwich the outer circumferential surface 360 ​​of the small-diameter portion 33 in the axial direction of the first body 31.

[0039] The outer circumferential surface 360 ​​of the small-diameter portion 33 is an annular surface provided on the outer surface of the first body 31. The outer circumferential surface 360 ​​of the small-diameter portion 33 is perpendicular to the second end surface 31b and groove-forming surface 33b of the large-diameter portion 32. The mounting groove 36 is defined by the outer circumferential surface 360 ​​of the small diameter portion 33, the second end face 31b of the large diameter portion 32, and the groove-forming surface 33b of the flange 33a. The opening width W of the mounting groove 36 is the dimension between the second end face 31b and the groove-forming surface 33b in the axial direction of the first body 31.

[0040] As shown in Figure 3, the first body 31 is formed in a substantially cylindrical shape by integrally assembling two first body forming bodies 37. Each of the two first body forming bodies 37 is substantially semi-cylindrical. The two first body forming bodies 37 are halves obtained by dividing the first body 31 in half. Each of the two first body forming bodies 37 has two fixing female screws 38.

[0041] A fixing screw 39 is screwed into each of the fixing female threads 38 that face each other in the two first body forming bodies 37. The first body 31 is formed by screwing the fixing screws 39 into the fixing female threads 38. By removing the fixing screws 39 from the fixing female threads 38, the first body 31 can be divided into two first body forming bodies 37.

[0042] The first through-hole 31h penetrates the first body 31 in the axial direction of the first body 31. The first through-hole 31h is circular in shape. The first central axis L10, which is the central axis of the first through-hole 31h, coincides with the axis of the first body 31. The first jig 30 can be divided into two first body forming bodies 37 in a direction perpendicular to the first central axis L10. The mouthpiece portion 12 is inserted through the first through-hole 31h. The fastening portion 23 can be inserted through the first through-hole 31h.

[0043] <Second Jig> As shown in Figures 1, 2, and 5, the second jig 40 is mounted on the outside of the first jig 30. The second jig 40 has a second body 41 and a second through hole 41h. The second body 41 is substantially plate-shaped. The second body 41 has a first surface 42a and a second surface 42b. The first surface 42a is located on the opposite side of the second surface 42b in the thickness direction of the second body 41. The thickness T of the second body 41 is slightly less than the opening width W of the mounting groove 36.

[0044] The second through-hole 41h penetrates the second body 41 in the thickness direction. The second through-hole 41h is circular in shape. The axis of the second through-hole 41h coincides with the axis of the second body 41. The diameter of the second through-hole 41h is slightly larger than the outer diameter of the small-diameter portion 33.

[0045] Multiple fitting holes 43 are formed on the first surface 42a of the second body 41. In this embodiment, the second jig 40 has two fitting holes 43. Both fitting holes 43 are arranged concentrically with respect to the second central axis L20, which is the central axis of the second through hole 41h. The two fitting holes 43 are positioned on either side of the second through hole 41h. Furthermore, the two fitting holes 43 are positioned on the extension of the diameter of the second through hole 41h. Guide rods 44 are inserted into and fitted into both fitting holes 43. Therefore, the second jig 40 has two guide rods 44 arranged concentrically with respect to the second central axis L20 of the second through hole 41h.

[0046] The guide rods 44 are made of metal. Both guide rods 44 extend parallel to each other. The axes of both guide rods 44 extend parallel to the second central axis L20 from the second body 41. When the guide rods 44 are fitted into the fitting holes 43, the length from the first surface 42a to the tip of the guide rod 44 is defined as the protruding length A1. The protruding length A1 is longer than the length A2 from the base end of the fastening portion 23 to the O-ring 27.

[0047] The second body 41 is formed in a substantially plate shape by integrally assembling two second body forming bodies 45. Each of the two second body forming bodies 45 is a half-section of the second body 41. One of the two second body forming bodies 45 has a connecting engaging piece 46, and the other of the two second body forming bodies 45 has a connecting engaging projection 47. Furthermore, each of the two second body forming bodies 45 has a hole defining surface 48 that defines the second through hole 41h. When viewed in the thickness direction of the second body forming body 45, the hole defining surface 48 is semicircular.

[0048] The second jig 40 is attached to the first jig 30 by assembling two second body forming bodies 45. Each of the two second body forming bodies 45 is positioned outside the first jig 30 with its perforation surface 48 facing the outer circumferential surface 360 ​​of the small diameter portion 33. The connecting engaging piece 46 engages with the connecting engaging projection 47. The engagement of the connecting engaging piece 46 with the connecting engaging projection 47 forms the second body 41 and the second through hole 41h, and the second jig 40 is attached to the first jig 30. By releasing the engagement of the connecting engaging piece 46 with the connecting engaging projection 47, the second body 41 can be divided into two second body forming bodies 45 in a direction perpendicular to the second central axis L20.

[0049] When the second jig 40 is attached to the first jig 30, the portion of the first surface 42a along the edge of the second through hole 41h and the groove-forming surface 33b face each other in the axial direction of the first jig 30. When the second jig 40 is attached to the first jig 30, the portion of the second surface 42b along the edge of the second through hole 41h and the second end surface 31b of the large-diameter portion 32 face each other in the axial direction of the first jig 30. When the second jig 40 is attached to the first jig 30, the movement of the second jig 40 in the axial direction of the first jig 30 is restricted by the groove-forming surface 33b and the second end surface 31b.

[0050] The inner circumferential surface 410h of the second through hole 41h is slidable against the outer circumferential surface 360 ​​of the mounting groove 36. Therefore, the inner circumferential surface 410h of the second through hole 41h is a sliding surface that defines the second through hole 41h and slides against the annular surface. In other words, no gap is formed between the inner circumferential surface 410h of the second through hole 41h and the outer circumferential surface 360 ​​of the mounting groove 36. Therefore, the first central axis L10 of the first through hole 31h and the second central axis L20 of the second through hole 41h are located coaxially.

[0051] <Assembly method and operation> Next, the assembly method of the valve assembly 20 using the assembly jig 1 will be explained along with its operation. The assembly method consists of a first step, a second step, a third step, a fourth step, a fifth step, and a sixth step. It is assumed that the first jig 30 is formed by integrally assembling two first body forming bodies 37 with fixing screws 39. Furthermore, it is assumed that the engagement of the connecting engaging piece 46 with the connecting engaging projection 47 is released, and the second jig 40 is disassembled into two second body forming bodies 45.

[0052] As shown in Figure 2, in the first step, the worker fixes the first jig 30 to the outside of the nozzle portion 12 of the high-pressure tank 10. The worker inserts the nozzle portion 12 into the first through hole 31h from the first end face 31a side. As shown in Figure 1, the worker inserts the nozzle portion 12 into the first through hole 31h until the tip of the nozzle portion 12 abuts against the restricting projection 33c. Then, the first jig 30 is positioned on the nozzle portion 12 while restricting its movement in the axial direction. At this time, no gap is formed between the outer circumferential surface of the nozzle portion 12 and the inner circumferential surface of the first body 31 that defines the first through hole 31h. Therefore, the central axis L1 of the female screw 13 and the first central axis L10 of the first through hole 31h are located coaxially. The worker inserts the restricting member 35 into the mounting hole 32h, and then screws the fixing screw 34 into the mounting hole 32h. The restricting member 35 is made of resin. With the restricting member 35 housed in the mounting hole 32h, the fixing screw 34 is screwed into the mounting hole 32h. The fixing screw 34 screws into the mounting hole 32h while pressing the restricting member 35 against the outer circumferential surface of the mouth portion 12. As a result, the restricting member 35 restricts the movement of the first body 31 in the axial and circumferential directions. The first jig 30 is then fixed to the outside of the mouth portion 12.

[0053] As shown in Figures 4 and 5, in the second step, the worker attaches the second jig 40 to the first jig 30 so that the inner surface 410h of the second through hole 41h can slide against the outer surface 360 ​​of the small diameter portion 33. As a result, the first jig 30 is fixed to the outside of the mouth portion 12, and the second jig 40 is attached to the outside of the first jig 30 so that the inner surface 410h of the second through hole 41h can slide against the outer surface 360 ​​of the small diameter portion 33. In this mounting state, the outer surface 360 ​​of the small diameter portion 33 and the inner surface 410h of the second through hole 41h are arranged concentrically with respect to the central axis L1 of the female screw 13.

[0054] As shown in Figure 1, in the third step, the worker fits the guide rod 44 into the fitting hole 43 of the second jig 40 and inserts the guide rod 44 into the fitting hole 43. Then, the worker moves the valve assembly 20 toward the first jig 30 and inserts each guide rod 44 into the insertion hole 25 of the housing 21. At this time, both guide rods 44 are arranged concentrically with respect to the second central axis L20, that is, the inner circumferential surface 410h of the second through hole 41h, and parallel to the second central axis L20. For this reason, both guide rods 44 can be said to be arranged concentrically with respect to the central axis L1 of the female screw 13. For this reason, the insertion hole 25 through which the guide rods 44 are inserted is also arranged concentrically with respect to the second central axis L20, and therefore the insertion hole 25 can be said to be arranged concentrically with respect to the central axis L1 of the female screw 13. Furthermore, since the central axis L2 of the fastening portion 23 is also the center of the virtual circle C, the central axis L2 of the fastening portion 23 also coincides with the central axis L1 of the female thread 13 in the mouth portion 12.

[0055] Furthermore, the protruding length A1, which is the length from the first surface 42a to the tip of the guide rod 44, is longer than the length A2 from the base end of the fastening portion 23 to the O-ring 27. Therefore, when the tip of the guide rod 44 is inserted into the through hole 25, the O-ring 27 is further away from the first surface 42a. Thus, when the guide rod 44 is inserted into the through hole 25, the O-ring 27 does not enter the inside of the female thread 13.

[0056] As shown in Figure 4, in the fourth step, the worker pushes the valve assembly 20 toward the high-pressure tank 10. In other words, the worker moves the valve assembly 20 along the guide rod 44. The valve assembly 20 then moves toward the high-pressure tank 10 along the guide rod 44. The nozzle 28 and fastening part 23 pass inside the restricting ridge 33c and enter inside the nozzle part 12. Furthermore, the nozzle 28 and fastening part 23 enter inside the female thread 13 from their respective tips and pass through the inside of the female thread 13. The O-ring 27 also enters inside the female thread 13 and passes through the inside of the female thread 13.

[0057] The valve assembly 20 moves toward the high-pressure tank 10 while maintaining the alignment of the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 in the nozzle portion 12, guided by the guide rod 44. In other words, the fastening portion 23 passes inside the female thread 13 without any misalignment, guided by the guide rod 44. As a result, the O-ring 27 attached to the fastening portion 23 also passes inside the female thread 13 without any misalignment.

[0058] As shown in Figure 6, the worker inserts the fastening portion 23 of the valve assembly 20 into the nozzle portion 12 of the high-pressure tank 10 until the male thread 24 of the fastening portion 23 contacts the female thread 13 of the nozzle portion 12. At this time, the O-ring 27 is located inside the female thread 13.

[0059] In the fifth step, the worker rotates the valve assembly 20 around the central axis L2 of the fastening portion 23 as the center of rotation. The rotation of the valve assembly 20 is transmitted to the second jig 40 by the guide rod 44. The first jig 30 is restricted from moving, i.e., rotating, in the circumferential direction relative to the nozzle portion 12. Therefore, the inner surface of the second jig 40 slides against the outer surface 360 ​​of the small diameter portion 33. As a result, the second jig 40 rotates relative to the first jig 30. In other words, the second jig 40 rotates together with the valve assembly 20. As the valve assembly 20 rotates, the male thread 24 of the fastening portion 23 is screwed into the female thread 13.

[0060] The valve assembly 20 rotates while maintaining the alignment of the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 in the nozzle portion 12, thanks to the guide rod 44. In other words, the fastening portion 23 rotates without axial misalignment thanks to the guide rod 44. As a result, the O-ring 27 fitted to the fastening portion 23 passes inside the female thread 13 without axial misalignment.

[0061] Then, when the O-ring 27 moves out from the inside of the female thread 13, the O-ring 27 comes into contact with the sealing surface 14. When the operator recognizes the resistance caused by the contact between the O-ring 27 and the sealing surface 14, they stop rotating the valve assembly 20.

[0062] As shown in Figure 7, in the sixth step, the worker removes the guide rod 44 from the fitting hole 43 and passes it through the insertion hole 25 to remove the guide rod 44 from the valve assembly 20. The worker disengages the connecting engaging piece 46 and the connecting engaging projection 47 to separate the second jig 40. The worker removes each second body forming body 45 from the mounting groove 36 to remove the second jig 40 from the first jig 30.

[0063] Next, the worker removes the fixing screw 34 from the mounting hole 32h of the first jig 30. The worker removes each first body forming body 37 from the outer circumferential surface of the nozzle portion 12 and removes the first jig 30 from the nozzle portion 12. The worker then tightens the valve assembly 20 to the nozzle portion 12 by further rotating the valve assembly 20 around the central axis L2 of the fastening portion 23. As a result, the O-ring 27 of the fastening portion 23 seats on the sealing surface 14 of the nozzle portion 12. Therefore, the inside and outside of the high-pressure tank 10 are sealed.

[0064] Then, as shown in Figure 8, the valve assembly 20 is assembled to the nozzle portion 12 with the central axis L1 of the female thread 13 in the nozzle portion 12 and the central axis L2 of the fastening portion 23 aligned.

[0065] <Effects of the Embodiment> In the above embodiment, the following effects can be obtained. (1) The second jig 40 can rotate relative to the first jig 30. When the guide rod 44 of the second jig 40 is inserted into the insertion hole 25 of the valve assembly 20, the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 can be aligned. Therefore, when the valve assembly 20 is moved toward the nozzle portion 12 along the guide rod 44, the fastening portion 23 is inserted into the nozzle portion 12 of the high-pressure tank 10 with the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 aligned.

[0066] Furthermore, even when the valve assembly 20 is rotated, the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 are aligned, allowing the male thread 24 of the fastening portion 23 to be screwed into the female thread 13 of the nozzle portion 12. As a result, coaxiality of the nozzle portion 12, the first jig 30, the second jig 40, and the valve assembly 20 can be ensured, making it less likely for the O-ring 27 to interfere with the female thread 13 of the nozzle portion 12 when fastening the fastening portion 23 to the nozzle portion 12. Therefore, by using the assembly jig 1, damage to the O-ring 27 when fastening the fastening portion 23 to the nozzle portion 12 can be suppressed. As a result, even in a high-pressure tank 10 where the nozzle portion 12 is axially sealed by the O-ring 27, airtightness can be ensured.

[0067] (2) The surfaces of the first jig 30 and the second jig 40 are treated with hard chrome plating. This allows the operator to easily rotate the second jig 40 relative to the first jig 30.

[0068] (3) The surfaces of the first jig 30 and the second jig 40 are treated with hard chrome plating. As a result, when the second jig 40 rotates relative to the first jig 30, the first jig 30 and the second jig 40 slide against each other via their respective plating layers. Therefore, the first jig 30 and the second jig 40 do not slide against each other directly. Consequently, the generation of wear particles when the first jig 30 and the second jig 40 slide against each other can be suppressed.

[0069] (4) The restrictive projection 33c is in contact with the tip of the nozzle portion 12. This allows the first jig 30 to be positioned relative to the nozzle portion 12. (5) The protruding length A1 of the guide rod 44 is longer than the length A2 from the base end of the fastening portion 23 to the O-ring 27. Therefore, when the tip of the guide rod 44 is inserted into the through hole 25, the O-ring 27 is away from the first surface 42a. Thus, when the tip of the guide rod 44 is inserted into the through hole 25, the O-ring 27 does not enter the inside of the female thread 13. Therefore, before the guide rod 44 is inserted into the through hole 25, the O-ring 27 is not inserted into the inside of the mouth portion 12 and does not come into contact with the female thread 13.

[0070] (6) The first jig 30 has a mounting groove 36. When the second jig 40 is mounted in the mounting groove 36, the movement of the second jig 40 in the axial direction of the first jig 30 is restricted by the groove forming surface 33b and the second end surface 31b. As a result, the operator can easily rotate the second jig 40 and also easily move the valve assembly 20 toward the nozzle portion 12.

[0071] (7) The first jig 30 is separable into two first body forming bodies 37. After fastening the fastening portion 23 to the nozzle portion 12, the housing 21 of the valve assembly 20 prevents the first jig 30 from moving in the axial direction of the nozzle portion 12. At this time, the first jig 30 can be removed from the nozzle portion 12 by separating the first jig 30 into two first body forming bodies 37.

[0072] (8) The second jig 40 is divisible into two second body forming bodies 45. When the second jig 40 is mounted in the mounting groove 36, the movement of the first jig 30 in the axial direction is restricted by the groove forming surface 33b and the second end surface 31b. At this time, the second jig 40 can be removed from the mounting groove 36 by dividing the second jig 40 into two second body forming bodies 45.

[0073] (9) In the assembly method of the valve assembly 20, by performing the first, second, and third steps, the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 can be aligned. Then, in the fourth step, by moving the valve assembly 20 along the guide rod 44, the valve assembly 20 can be moved while the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 are aligned. Furthermore, in the fifth step, the guide rod 44 allows the fastening portion 23 to be screwed into the female thread 13 while the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 are aligned. Therefore, by using the assembly jig 1, damage to the O-ring 27 when fastening the fastening portion 23 of the valve assembly 20 to the nozzle portion 12 can be suppressed.

[0074] Furthermore, in the sixth step, the fastening portion 23 can be fully tightened to the mouth portion 12. Therefore, when inserting and fastening the fastening portion 23 to the mouth portion 12, the O-ring 27 attached to the fastening portion 23 can be attached to the mouth portion 12 in a manner that minimizes interference between the O-ring 27 attached to the fastening portion 23 and the female thread 13 of the mouth portion 12.

[0075] (10) With the assembly jig 1, in the fifth step, the valve assembly 20 can be rotated using the assembly jig 1 until the O-ring 27 comes out from the inside of the female thread 13 and contacts the sealing surface 14. The thickness of the flange 33a and the restricting ridge 33c of the first body 31 is set to enable this fifth step. The thinner the flange 33a and the restricting ridge 33c of the first body 31, the greater the amount that the male thread 24 can be fastened to the female thread 13 before the housing 21 of the valve assembly 20 contacts the flange 33a and the restricting ridge 33c in the fifth step. However, the thinner the flange 33a and the restricting ridge 33c are, the more easily they are deformed. The thickness of the flange 33a and the restricting ridge 33c is set to a thickness that has the required strength while enabling the O-ring 27 to contact the sealing surface 14. Therefore, by setting the flange 33a and the restricting protrusion 33c to the required thickness, in the fifth step, the valve assembly 20 can be rotated using the assembly jig 1 until the O-ring 27 comes out from the inside of the female thread 13 and contacts the sealing surface 14, and deformation of the assembly jig 1 can be suppressed.

[0076] <Example of changes> The above embodiment can be implemented with the following modifications. The above embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0077] ○ As shown in Figure 13, depending on the outer diameter of the nozzle portion 12, a gap H may be formed between the outer circumferential surface of the nozzle portion 12 and the inner circumferential surface of the first body 31. In the assembly jig 1, the diameter of the first through hole 31h is constant. In contrast, the outer diameter of the nozzle portion 12 may differ for each individual high-pressure tank 10 within the tolerance range of the outer diameter of the nozzle portion 12. When the outer diameter of the nozzle portion 12 is at the minimum value of the tolerance range, the gap H is largest. Conversely, when the outer diameter of the nozzle portion 12 is at the maximum value of the tolerance range, the gap H is smallest.

[0078] When a gap H is formed between the outer circumferential surface of the nozzle portion 12 and the inner circumferential surface of the first body 31, as shown by the dashed line in Figure 9, when the nozzle portion 12 is pressed directly against the inner circumferential surface of the first body 31 by the fixing screw 34 and the regulating member 35, the first central axis L10 of the first through hole 31h is misaligned with respect to the central axis L1 of the female thread 13 in the nozzle portion 12, as shown in Figures 9 and 10.

[0079] If the above gap H is formed, in the first step, the position adjustment member 50 is inserted into the gap H between the outer circumferential surface of the nozzle portion 12 and the inner circumferential surface of the first body 31, and then the first jig 30 is fixed to the outside of the nozzle portion 12.

[0080] As shown in Figures 11, 12, and 13, the position adjustment member 50 is a thin, elongated metal plate. The position adjustment member 50 is flexible. Multiple types of position adjustment members 50 with different plate thicknesses are available. The position adjustment member 50 can be made of any material, shape, etc., as long as it can be inserted into the gap H and is flexible.

[0081] As described above, the diameter of the first through-hole 31h is constant. On the other hand, the outer diameter of the nozzle portion 12 may differ for each high-pressure tank 10, so when a gap H is formed, the outer diameter of the nozzle portion 12 is measured. Then, the difference between the diameter of the first through-hole 31h and the outer diameter of the nozzle portion 12 can be determined in advance. Therefore, the dimensions of the gap H can also be determined. Then, according to the determined dimensions of the gap H, a position adjustment member 50 to be used is selected from among several types.

[0082] In the first step, the position adjustment member 50 is first inserted into the gap H. This forms a concentric gap H between the outer surface of the mouthpiece portion 12 and the inner surface of the first body 31, with the central axis L1 and the first central axis L10 as the centers. The dimensions of the gap H are constant in the circumferential direction. Therefore, the plate thickness of the selected position adjustment member 50 is slightly smaller than the dimensions of the gap H when a gap H that is constant in the circumferential direction is formed.

[0083] The position adjustment member 50 is inserted into the gap H from the first end face 31a side of the first jig 30, opposite to the flange 33a and the restricting projection 33c. The position adjustment member 50 is inserted into the gap H from a position along the circumferential direction of the first body 31, 180 degrees opposite to the mounting hole 32h. The position adjustment member 50 deforms into an arc shape to conform to the outer circumferential surface of the mouth portion 12 and the inner circumferential surface of the first body 31.

[0084] Then, when the position adjustment member 50 is inserted into the gap H, the relative position between the jaw portion 12 and the first jig 30 is adjusted by the position adjustment member 50. Specifically, the central axis L1 of the female thread 13 in the jaw portion 12 and the first central axis L10 of the first through hole 31h in the first jig 30 are located coaxially. With the central axis L1 of the female thread 13 in the jaw portion 12 and the first central axis L10 of the first through hole 31h in the first jig 30 located coaxially, the worker inserts the regulating member 35 into the mounting hole 32h and then screws the fixing screw 34 into the mounting hole 32h.

[0085] At this time, the nozzle portion 12 is pushed in by the fixing screw 34 via the restricting member 35, but the movement of the nozzle portion 12 is restricted by the position adjustment member 50 located 180 degrees opposite to the mounting hole 32h. In other words, the state adjusted by the position adjustment member 50 is maintained. As a result, the first jig 30 is fixed to the nozzle portion 12 with the central axis L1 of the female screw 13 in the nozzle portion 12 and the first central axis L10 of the first through hole 31h in the first jig 30 located coaxially.

[0086] In this configuration, even if a gap H is formed between the outer circumferential surface of the nozzle portion 12 and the inner circumferential surface of the first body 31, it becomes possible to fix the first jig 30 to the outside of the nozzle portion 12 by positioning the female thread 13 of the nozzle portion 12 and the first through hole 31h coaxially. In other words, it becomes possible to fix the first jig 30 to the nozzle portion 12 by positioning the central axis L1 of the female thread 13 in the nozzle portion 12 and the first central axis L10 of the first through hole 31h in the first jig 30 coaxially.

[0087] Therefore, even if a gap H is formed, by performing the first step using the position adjustment member 50, when the valve assembly 20 is positioned facing the nozzle portion 12 using the assembly jig 1, the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 can be aligned. As a result, when the valve assembly 20 is rotated with the central axis L2 of the fastening portion 23 as the center of rotation and the male thread 24 of the fastening portion 23 is screwed into the female thread 13, the screwing can be done while maintaining the state in which the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 in the nozzle portion 12 are aligned. As a result, the assembly load generated during screwing can be reduced compared to when the male thread 24 and female thread 13 are screwed in with the central axis L2 of the fastening portion 23 and the central axis L1 of the female thread 13 in the nozzle portion 12 misaligned.

[0088] In addition, during the sixth step, the worker removes the first jig 30 from the jaw portion 12 and simultaneously removes the position adjustment member 50. ○ As shown in Figure 14, the guide rod 44 may be thicker than in the embodiment. The thickness of the guide rod 44 is set to the maximum value of the tolerance range of the guide rod 44. In this case, when the guide rod 44 is inserted into the insertion hole 25, the tilt of the guide rod 44 within the insertion hole 25 can be suppressed.

[0089] ○ In the first jig 30, the thickness of the flange 33a and the restrictive ridge 33c may be thicker than in the embodiment. ○ The assembly method for the valve assembly 20 does not necessarily have to include a sixth step.

[0090] ○ The first jig 30 does not have to be a half-piece. In other words, the first body 31 may be formed from three or more first body forming bodies 37. ○ The first jig 30 may be formed by connecting two first body forming bodies 37 with hinges or pivot axes to form a single unit. In this case, the first jig 30 is not divided, and is attached to and detached from the mouth part 12 with a part of it connected.

[0091] Regarding the first jig 30, if the outer circumferential surface 360 ​​of the small diameter portion 33 is an annular surface, the large diameter portion 32 does not have to be cylindrical. ○ The shape of the outer surface of the nozzle portion 12 does not have to be cylindrical. In this case, the first through hole 31h of the first jig 30 is changed according to the shape of the outer surface of the nozzle portion 12.

[0092] ○ The second jig 40 does not have to be a half-piece. In other words, the second body 41 may be formed from three or more second body forming bodies 45. ○ The second jig 40 may be formed by connecting two second body forming bodies 45 with hinges or pivot axes to form a single unit. In this case, the second jig 40 is not divided, and is attached to and detached from the first jig 30 with a part of it connected.

[0093] ○ The flange 33a of the first jig 30 is optional. In this case, the first jig 30 does not have a mounting groove 36. That is, the first jig 30 has an annular surface consisting of the outer circumferential surface 360 ​​of the small diameter portion 33. Also, if the flange 33a is absent, the second jig 40 does not need to be divided into two second body forming bodies 45.

[0094] ○ Hard chrome plating may be applied only to the outer circumferential surface 360 ​​of the mounting groove 36 of the first jig 30. ○ Hard chrome plating may be applied only to the inner circumferential surface 410h of the second through hole 41h of the second jig 40.

[0095] ○ The plating treatment applied to the surface of the first jig 30 and the surface of the second jig 40 is not limited to hard chromium plating. ○ The second jig 40 may have three or more guide rods 44. In this case, the number of insertion holes 25 and fitting holes 43 should be equal to the number of guide rods 44.

[0096] ○ The guide rod 44 does not necessarily have to be fitted into the second jig 40 by being inserted into it. For example, the male thread provided at the base end of the guide rod 44 may be screwed into the female thread provided on the second jig 40.

[0097] The technical concepts that can be understood from the above embodiments and modified examples are described below. [Aspect 1] A valve assembly assembly jig for assembling the valve assembly to the nozzle portion, wherein the female thread of a high-pressure tank having a female thread in the nozzle portion fastens to the male thread of a valve assembly having a housing in which a valve is built and a fastening portion protruding from the housing, and the space between the nozzle portion and the fastening portion is sealed by a seal portion positioned at the tip of the fastening portion beyond the male thread in the axial direction extending from the central axis of the fastening portion, the jig comprises a first jig fixed to the outside of the nozzle portion and a second jig attached to the outside of the first jig, the first jig having a first body, a first through hole penetrating the first body and through which the nozzle portion can be inserted, and the first body concentrically with respect to the first central axis of the first through hole A valve assembly assembly jig having an annular surface provided on the outer surface of the second jig, the second jig having a second body, a second through hole penetrating the second body, a sliding surface defining the second through hole and slidable relative to the annular surface in the circumferential direction of the annular surface, and a plurality of guide rods arranged concentrically with respect to the second central axis of the second through hole and parallel to the second central axis, wherein the first jig is fixed to the outside of the nozzle portion, and the second jig is attached to the outside of the first jig so that the sliding surface is slidable relative to the annular surface, the annular surface and the sliding surface are arranged concentrically with respect to the central axis of the female screw, and the guide rods are insertable into insertion portions provided in the housing concentrically with respect to the central axis of the fastening portion.

[0098] [Aspect 2] The assembly jig for a valve assembly according to [Aspect 1], wherein the first jig is divisible into two first body forming bodies in a direction perpendicular to the first central axis. [Aspect 3] The assembly jig for a valve assembly according to [Aspect 1] or [Aspect 2], wherein the first jig has a mounting groove in the first body for mounting the second jig, and the mounting groove is defined by the sliding surface and two opposing surfaces that sandwich the sliding surface in the axial direction of the first body.

[0099] [Aspect 4] The assembly jig for a valve assembly according to [Aspect 3], wherein the second jig is divisible into two second body forming bodies. [Aspect 5] A method for assembling a valve assembly to a nozzle, wherein the female thread of a high-pressure tank having a female thread in the nozzle portion fastens the male thread of a valve assembly having a housing in which a valve is built and a male thread in a fastening portion protruding from the housing, and the valve assembly is assembled to the nozzle portion in such a state that the space between the nozzle portion and the fastening portion is sealed by a seal portion located at the tip of the fastening portion rather than the male thread in the axial direction in which the central axis of the fastening portion extends, the method comprising: first step of fixing the first jig to the outside of the nozzle portion using an assembly jig described in any one of [Aspect 1] to [Aspect 4] A method for assembling a valve assembly, comprising: a second step of attaching the second jig to the first jig so that the sliding surface can slide against the annular surface; a third step of attaching the guide rod to the second jig and then inserting the guide rod into the insertion portion of the housing; a fourth step of moving the valve assembly along the guide rod and inserting the fastening portion into the nozzle portion until the male thread of the fastening portion contacts the female thread of the nozzle portion; and a fifth step of rotating the valve assembly with the central axis of the fastening portion as the center of rotation, thereby screwing the male thread into the female thread.

[0100] [Aspect 6] The valve assembly assembly method according to [Aspect 5], further comprising a sixth step of tightening the fastening portion to the nozzle portion by further rotating the valve assembly with the central axis of the fastening portion as the center of rotation after removing the guide rod, the first jig, and the second jig from the nozzle portion.

[0101] [Aspect 7] A method for assembling a valve assembly according to [Aspect 5] or [Aspect 6], wherein, in the first step, a position adjustment member is inserted into the gap and then the first jig is fixed to the outside of the nozzle, when there is a gap between the outer surface of the nozzle and the surface of the first body that defines the first through hole. [Explanation of symbols]

[0102] 1...Assembly jig, 10...High-pressure tank, 12...Mouthpiece, 13...Female thread, 14...Sealing surface, 20...Valve assembly, 21...Housing, 22...Valve, 23...Fastening part, 24...Male thread, 25...Through hole as insertion part, 27...O-ring as sealing part, 30...First jig, 31...First body, 31h...First through hole, 32h...Through hole, 36...Mounting groove, 37...First body forming body, 40...Second jig, 41...Second body, 41h...Second through hole, 44...Guide rod, 45...Second body forming body, 50...Position adjustment member, 360...Outer circumference which is annular surface, 410h...Inner circumference which is sliding surface, H...Gap, L1...Central axis, L2...Central axis, L10...First central axis, L20...Second central axis.

Claims

1. The female thread of a high-pressure tank having a female thread at the nozzle, The housing containing the valve, and the male thread of the valve assembly having a male thread on a fastening portion protruding from the housing, are fastened together. A valve assembly assembly jig for assembling the valve assembly to the nozzle portion, wherein the seal portion located at the tip of the fastening portion rather than the male screw in the axial direction extending from the central axis of the fastening portion, seals the space between the nozzle portion and the fastening portion, A first jig fixed to the outside of the mouthpiece portion, The first jig is fitted to the outside of the second jig, The first jig is, The first body and A first through-hole that penetrates the first body and through which the mouthpiece portion can be inserted, The first body has an annular surface provided on its outer surface in a concentric circle with respect to the first central axis of the first through hole, The second jig is, The second body and A second through-hole that penetrates the second body, A sliding surface is provided that defines the second through hole and is slidable relative to the annular surface in the circumferential direction of the annular surface, The second through-hole has a plurality of guide rods arranged concentrically with respect to the second central axis and parallel to the second central axis, With the first jig fixed to the outside of the mouthpiece portion and the second jig attached to the outside of the first jig so that the sliding surface can slide relative to the annular surface, the annular surface and the sliding surface are arranged concentrically with respect to the central axis of the female screw. The guide rod is an assembly jig for a valve assembly that can be inserted into an insertion portion provided in the housing in a concentric manner with respect to the central axis of the fastening portion.

2. The assembly jig for a valve assembly according to claim 1, wherein the first jig is separable into two first body forming bodies in a direction perpendicular to the first central axis.

3. The assembly jig for a valve assembly according to claim 1 or claim 2, wherein the first jig has a mounting groove in the first body for mounting the second jig, and the mounting groove is defined by the sliding surface and two opposing surfaces that sandwich the sliding surface in the axial direction of the first body.

4. The assembly jig for a valve assembly according to claim 3, wherein the second jig is separable into two second body forming bodies.

5. The female thread of a high-pressure tank having a female thread at the nozzle, The housing containing the valve, and the male thread of the valve assembly having a male thread on a fastening portion protruding from the housing, are fastened together. A method for assembling a valve assembly to a nozzle portion, wherein the space between the nozzle portion and the fastening portion is sealed by a sealing portion positioned at the tip of the fastening portion rather than the male screw in the axial direction extending from the central axis of the fastening portion, Using the assembly jig described in claim 1 or claim 2, The first step is to fix the first jig to the outside of the mouthpiece portion, A second step involves attaching the second jig to the first jig to make the sliding surface slidable relative to the annular surface, A third step involves attaching the guide rod to the second jig, and then inserting the guide rod into the insertion portion of the housing. A fourth step involves moving the valve assembly along the guide rod and inserting the fastening portion into the nozzle portion until the male thread of the fastening portion contacts the female thread of the nozzle portion. A method for assembling a valve assembly, comprising a fifth step of screwing the male thread into the female thread by rotating the valve assembly about the central axis of the fastening portion as the center of rotation.

6. The valve assembly assembly method according to claim 5, further comprising a sixth step of tightening the fastening portion to the nozzle portion by further rotating the valve assembly with the central axis of the fastening portion as the center of rotation, after removing the guide rod, the first jig, and the second jig from the nozzle portion.

7. The valve assembly assembly method according to claim 5, wherein, if there is a gap between the outer circumferential surface of the nozzle portion and the surface of the first body that defines the first through hole, in the first step, a position adjustment member is inserted into the gap and then the first jig is fixed to the outside of the nozzle portion.

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