JP6472855B1 - Piping joint, piping for high pressure gas, welding method, method for manufacturing high pressure gas device, and high pressure gas device - Google Patents

Abstract

Provided is a pipe joint that can suppress or prevent dimensional deviation, can be simplified in structure, has excellent pressure resistance, and can easily finely adjust the angle between pipes. A pipe joint 21 connectable to a high-pressure gas pipe 11, wherein the pipe joint has a female thread portion 22A for connecting to a terminal of the high-pressure gas pipe 11, and the terminal of the high-pressure gas pipe The high-pressure gas pipe and the pipe joint can be connected by fitting the male screw part 12A provided on the outer surface of the pipe to the female thread part of the pipe joint, and the high-pressure gas pipe and the pipe joint at the connection portion. And two high-pressure gas pipes can be connected by connecting two female threaded parts of the pipe joint in series, and one of the female threaded parts arranged in series is one female thread. The pipe joint is characterized in that the part is a right-hand thread and the other female thread part is a left-hand thread. [Selection] Figure 3

Description

  The present invention relates to a pipe joint, a high-pressure gas pipe, a welding method, a method for manufacturing a high-pressure gas device, and a high-pressure gas device.

  High pressure gas piping must be thick to withstand high pressures. For this reason, the high pressure gas pipe is difficult to bend, unlike the thin pipe for the low pressure gas. For this reason, a joint is used for high-pressure gas piping instead of bending.

  Since the high-pressure gas pipe is thick as described above and may have a small inner diameter, it is difficult to weld the joint. In order to solve this problem, for example, a bayonet welded joint is used. In addition, instead of welding, a joint capable of connecting (connecting) a high-pressure gas pipe and a joint by a screw mechanism such as a nut screw or a collar screw is also used.

  However, in the insertion welded joint, there is inevitably a gap between the insertion portion and the high pressure gas pipe. For this reason, there is a possibility that a deviation in the direction of the high-pressure gas pipe may occur during welding.

  Further, a joint using a normal screw mechanism has a complicated structure using a large number of parts such as a nut screw and a collar screw as described above in order to withstand high pressure. For this reason, a joint using a screw mechanism is complicated in design and costly. In addition, due to a change in the environmental temperature of the high-pressure gas device (for example, a temperature increase due to compression heat of the high-pressure gas, a temperature decrease due to adiabatic expansion, or a change in air temperature), the screw mechanism repeatedly expands and contracts and gradually loosens. There is a risk of leakage. Also, the vibration of the high-pressure gas device or the like may cause the screw of the screw mechanism to gradually loosen, leading to gas leakage or the like. Furthermore, since the structure of the screw mechanism is complicated, it is difficult to weld, and the pressure resistance is limited.

  Furthermore, in a joint using a screw mechanism, it is difficult to finely adjust the angle between pipes.

  Therefore, the present invention can suppress or prevent the dimensional deviation, can simplify the structure, has excellent pressure resistance, and can easily adjust the angle between the pipes. It is an object of the present invention to provide piping, a welding method, a high-pressure gas device manufacturing method, and a high-pressure gas device.

In order to achieve the above object, the pipe joint of the present invention includes:
A pipe joint that can be connected to a high-pressure gas pipe,
The pipe joint has a female thread portion for connecting to the end of the high-pressure gas pipe;
By fitting the male thread portion provided on the outer surface of the terminal of the high-pressure gas pipe to the female thread section of the pipe joint, the high-pressure gas pipe and the pipe joint can be connected,
Further, the high-pressure gas pipe and the pipe joint can be welded at the connection portion,
By connecting two female thread portions of the pipe joint in series, two high-pressure gas pipes can be connected,
Of the two internal thread parts arranged in series, one female thread part is a right-hand thread and the other female thread part is a left-hand thread.

The piping for high pressure gas of the present invention is
In each of both ends, at least one of the outer surface and the inner surface is formed by a slope inclined with respect to the radial direction of the high-pressure gas pipe,
Furthermore, a male screw portion of a right-hand thread is formed on the outer surface close to one of the slopes, and a male screw portion of a left-hand screw is formed on the outer surface close to the other of the slopes,
Furthermore, it has a tightening part for fitting a tool to a part of outer surface in parts other than the said slope and the said external thread part, and tightening the external thread part.

  In the welding method of the present invention, the male screw portion in the high-pressure gas pipe having a male screw portion is fitted to the female screw portion in the pipe joint of the present invention, and the high-pressure gas pipe and the pipe joint are connected. In this state, a boundary portion between the high-pressure gas pipe and the pipe joint outer surface is welded.

  The manufacturing method of the apparatus for high pressure gas of this invention is characterized by including the process of welding the said piping for high pressure gas and the said piping joint by the welding method of the said this invention.

  The apparatus for high-pressure gas of the present invention includes a high-pressure gas pipe and the pipe joint of the present invention, and the high-pressure gas pipe and the pipe in a state where the high-pressure gas pipe and the pipe joint are connected. The boundary with the outer surface of the joint is welded.

  According to the pipe joint, the high pressure gas pipe, the welding method, the high pressure gas device manufacturing method, and the high pressure gas device according to the present invention, it is possible to suppress or prevent the dimensional deviation and to simplify the structure. Excellent pressure resistance, and fine adjustment of the angle between pipes is easy.

FIG. 1 is a schematic view showing an example of a high-pressure gas pipe of the present invention. 1A is a perspective view, FIG. 1B is a longitudinal sectional view, and FIG. 1C is a transverse sectional view. FIG. 2 is a schematic view showing an example of the pipe joint of the present invention. 2A is a left side view, and FIG. 2B is a cross-sectional view. FIG. 3 is a cross-sectional view schematically showing an example of a state in which the high-pressure gas pipe of the present invention and the pipe joint are connected. FIG. 3A shows a state before welding, and FIG. 3B shows a state after welding. FIGS. 4A and 4B are schematic views showing an example of a state in which the pipe joint of the present invention and the bent high-pressure gas pipe are connected to each other. FIGS. 5A and 5B are schematic views of the states of FIGS. 4A and 4B viewed from different angles. FIGS. 6A and 6B are schematic views showing another example of a state in which the pipe joint of the present invention and the bent high-pressure gas pipe are connected to each other. FIG. 7 is a schematic diagram showing an example of a state in which a plurality of pipe joints according to the present invention and a plurality of bent high-pressure gas pipes are connected. FIGS. 8A and 8B are schematic views showing an example of a state in which a pipe joint and pipe related to the present invention are connected to each other.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited or restricted by the following description.

  In the pipe joint of the present invention, for example, the one female thread part and the other female thread part are separated from each other, and between the one female thread part and the other female thread part, The screw may not be formed.

  In the pipe joint of the present invention, for example, a boundary between the pipe joint outer surface and the high-pressure gas pipe is formed so as to form an obtuse angle with respect to the outer surface of the high-pressure gas pipe. In a connected state, a boundary portion between the outer surface of the pipe joint and the high-pressure gas pipe may be weldable.

  In the pipe joint of the present invention, for example, the high-pressure gas pipe has at least one of an outer surface and an inner surface at at least one end formed by a slope inclined with respect to the radial direction of the high-pressure gas pipe, At least part of the outer surface of the part other than one end has a male thread part for connecting to the female thread part of the pipe joint, and a tightening part for fitting the tool and tightening the male thread part. High pressure gas piping may be used.

  In the pipe joint of the present invention, for example, the high-pressure gas may be a high-pressure gas containing at least one of a toxic gas and a combustible gas.

  In the pipe joint of the present invention, for example, the high-pressure gas may be hydrogen gas.

  The piping joint of the present invention may consist of only a single member, for example.

  In the high pressure gas pipe of the present invention, for example, the slope is formed on the outer surface of the high pressure gas pipe at one end of the both ends, and the slope is formed at the other end of the both ends. It may be formed on the inner surface of the high-pressure gas pipe.

  In the welding method of the present invention, for example, the high-pressure gas pipe may be the high-pressure gas pipe of the present invention.

  In the welding method of the present invention, for example, the tightening portion of the high-pressure gas pipe is positioned at a boundary portion between the pipe joint outer surface and the high-pressure gas pipe, and the tightening portion is welded together with the boundary portion. Also good.

  In the apparatus for high-pressure gas of the present invention, for example, the high-pressure gas pipe may be the high-pressure gas pipe of the present invention.

  In the apparatus for high pressure gas of the present invention, for example, a boundary portion between the pipe for high pressure gas and the outer surface of the pipe joint may be welded by the welding method of the present invention.

[Embodiment 1]
In FIG. 1, an example of the piping for high pressure gas of this invention is shown typically. FIG. 1A is a perspective view. FIG.1 (b) is the longitudinal cross-sectional view seen in the AA 'direction of Fig.1 (a). FIG.1 (c) is the cross-sectional view seen in the BB 'direction of FIG.1 (b). As shown in the figure, the high-pressure gas pipe 11 has an outer surface at one end formed by an inclined surface 14A and an inner surface at the other end formed by an inclined surface 14B. The slope 14A and the slope 14B are surfaces that are inclined with respect to the radial direction of the high-pressure gas pipe 11, respectively. Specifically, the inclined surface 14A is formed so as to form an obtuse angle with respect to the outer surface of the high-pressure gas pipe 11, and the inclined surface 14A forms a conical lower side surface shape. That is, the slope 14A protrudes toward the end of the high-pressure gas pipe 11. On the other hand, the slope 14B is a mortar-shaped slope formed so as to form an acute angle with respect to the outer surface of the high-pressure gas pipe 11. As will be described later, the slope 14B is a contact surface that can be brought into close contact with the slope 14A of another high-pressure gas pipe having the same structure as the high-pressure gas pipe 11 of FIG. Further, male screw portions 12A and 12B and tightening portions 13A and 13B are formed on a part of the outer surface of the portion other than the end. The male screw portion 12A is provided on the outer surface of the high-pressure gas pipe 11 at a position adjacent to the inclined surface 14A. The male screw portion 12B is provided on the outer surface of the high-pressure gas pipe 11 at a position adjacent to the slope 14B. One of the male screw portion 12A and the male screw portion 12B is a right-hand screw, and the other is a left-hand screw. The tightening portion 13A is provided on the side opposite to the inclined surface 14A with respect to the male screw portion 12A. The tightening portion 13B is provided on the opposite side to the inclined surface 14B with respect to the male screw portion 12B. As shown in the figure, in the tightening portions 13A and 13B, two surfaces facing each other are cut out (two-surface cut) on the outer surface of the pipe of the high-pressure gas pipe 11, and two planes parallel to each other are formed. A tool (for example, a spanner or a wrench) is fitted to the two-surface cut portion, and the male screw portion 12A or 12B can be rotated and tightened.

  In FIG. 1, the portion (intermediate portion) of the high-pressure gas pipe 11 other than the vicinity of both ends is not shown. The shape of the intermediate portion is not particularly limited, and may be, for example, straight, or may be bent or curved into an arbitrary shape.

  Next, FIGS. 2A and 2B schematically show an example of the pipe joint of the present invention. 2A is a left side view, and FIG. 2B is a cross-sectional view.

  As shown in FIGS. 2A and 2B, the pipe joint 21 has female screw portions 22A and 22B on the inner surface. The high-pressure gas pipe 11 and the pipe joint 21 can be connected by fitting the male thread portion 12A provided on the outer surface at the end of the high-pressure gas pipe 21 to the female thread portion 22A of the pipe joint 21. Further, the high-pressure gas pipe 11 and the pipe joint 21 can be connected by fitting the male thread portion 12B provided on the outer surface at the end of the high-pressure gas pipe 21 to the female thread portion 22B of the pipe joint 21. As illustrated, the female screw portions 22A and 22B are arranged in series. Thereby, as shown in FIG. 3 described later, two high-pressure gas pipes 11 can be connected. One of the female screw portions 22A and 22B is a right-hand thread, and the other is a left-hand thread. Further, the female screw portion 22A and the female screw portion 22B are separated from each other, and no screw is formed in the intermediate portion 24 between the female screw portion 22A and the female screw portion 22B on the inner surface of the pipe joint 21. When the two high-pressure gas pipes 11 are connected, both the male screw part 12A of one high-pressure gas pipe and the female screw part 12B of the other high-pressure gas pipe can enter the intermediate part 24. is there. Further, a boundary portion 201A between the female screw portion 22A and the outer surface of the pipe joint 21 forms a slope. Similarly, a boundary portion 201B between the female screw portion 22B and the outer surface of the pipe joint 21 forms a slope. An angle θ202A formed by the boundary portion 201A with the outer surface of the pipe joint 21 is 135 degrees, and an angle θ201A formed by the boundary portion 201A with the female screw portion 22 is 135 degrees. Similarly, an angle θ202B formed by the boundary portion 201B with the outer surface of the pipe joint 21 is 135 degrees, and an angle θ201B formed by the boundary portion 201B with the female screw portion 22 is 135 degrees. Further, when the high-pressure gas pipe 11 is connected as will be described later, the angle between the boundary portion 201A (slope) and the outer surface of the high-pressure gas pipe 11 is 135 degrees. Similarly, the angle between the boundary 201B (slope) and the outer surface of the high-pressure gas pipe 11 is 135 degrees. However, the angle is not limited to these and can be set as appropriate. Further, as shown in the figure, this pipe joint 21 has two female thread portions 22A and 22B and two boundary portions (slopes) with the high-pressure gas pipe 201A and 201B. It is a "straight" type pipe joint that can be used to connect straight pipes.

  FIG. 3 schematically shows an example of a state in which the pipe joint 21 and the high-pressure gas pipe 11 are connected. FIG. 3A shows a state before welding, and FIG. 3B shows a state after welding. As shown in FIG. 3A, the female screw portion 22A is fitted to the male screw portion 12A in one high-pressure gas pipe 11, and the female screw portion 22B is fitted to the male screw portion 12B in the other high-pressure gas pipe 11. By doing so, the pipe joint 21 and the two high-pressure gas pipes 11 are connected.

  In order to obtain the state of FIG. 3A, for example, the following is performed. That is, first, the male screw portion 12A in one high-pressure gas pipe 11 is inserted into the female screw portion 22A while being rotated (screwed), and a tool (for example, a spanner or a wrench) is further inserted into the tightening portion 13A of the high-pressure gas pipe 11. And the male screw portion 12A is tightened. Similarly, the male screw portion 12B in the other high-pressure gas pipe 11 is inserted into the female screw portion 22B while being rotated (screwed), and a tool (for example, a spanner or a wrench) is inserted into the tightening portion 13B of the high-pressure gas pipe 11. The male screw portion 12B is tightened by fitting. Then, by bringing the slope 14A on the outer surface of the end of one high-pressure gas pipe 11 into close contact with the slope 14B on the inner face of the other end of the pipe 11 for high-pressure gas, the state shown in FIG. In the state of FIG. 3A, the boundary portion 201A between the female screw portion 22A and the outer surface of the pipe joint 21 forms a slope, and similarly, the boundary portion 201B between the female screw portion 22B and the outer surface of the pipe joint 21 forms a slope. Yes. Thereby, as shown in the drawing, a recess 23 is formed between the two inclined surfaces and the outer surface of the pipe joint 21. Then, from the state of FIG. 3A, as shown in FIG. 3B, the boundary portions (concave portions) 23 between the two high-pressure gas pipes 11 and the outer surface of the pipe joint 21 are filled with the weld metal 15, respectively. The pipe joint 21 and the two high-pressure gas pipes 11 can be welded.

  2 and 3, as shown in the drawing, the tightening portions 13A and 13B of the high-pressure gas pipe 11 are positioned at the boundary portion (recessed portion) 23 between the outer surface of the pipe joint 11 and the high-pressure gas pipe 21, respectively. The parts 13A and 13B are welded together with the boundary part (concave part) 23. Thereby, since the notched portions (two-surface cut portions) of the tightening portions 13A and 13B are filled with the weld metal 15 together with the boundary portion (concave portion) 23, it is easy to weld more firmly. The two high-pressure gas pipes are welded in close contact with the slope 14A on the outer surface of one end of the high-pressure gas pipe 11 and the slope 14B on the inner surface of the other end of the high-pressure gas pipe 11. The airtightness of 11 boundary portions can be maintained.

  In the present invention, as described above, the pipe for high pressure gas and the pipe joint can be connected by fitting the threaded portion. Thereby, the pipe joint of this invention can suppress or prevent the angle | corner and dimension deviation of the piping for high pressure gas or the apparatus for high pressure gas using the same unlike the insertion welded joint which does not have a thread part. For example, when the high pressure gas pipes are connected straight as shown in FIGS. 2 and 3, according to the present invention, a straightness that does not go out of order even when welding can be ensured.

  Furthermore, in the present invention, since the pipe joint and the high-pressure gas pipe are connected by fitting the threaded portion, unlike the structure in which the threaded portion is not simply inserted, there is no need for temporary attachment before welding. Convenient. Furthermore, since it has a screw structure, it is easy to make fine adjustments to the installation height of the high-pressure gas pipe (the length of the end of the high-pressure gas pipe inserted into the pipe joint). is there.

  Furthermore, the piping joint of the present invention does not require a complicated structure using a large number of parts such as nut screws and collar screws. For this reason, the pipe joint of the present invention is easy to design and low in cost, is easy to weld, and has excellent pressure resistance.

In addition, as shown in FIGS. 3A and 3B, for example, the high-pressure gas pipe of the present invention has an inclined surface 14A on the outer surface of one high-pressure gas pipe 11 end and the other high-pressure gas pipe 11 end. Can be connected in close contact with the slope 14B on the inner surface. Thus, the in abutment surface each other closely portions, as described above, before Symbol two airtight boundary of the high pressure gas pipe 11 is kept in the (sealed), high-pressure gas from leaking out of the boundary Can be prevented.

  In addition, in the terminal of the high pressure gas pipe of the present invention, the contact surface with the terminal of the other high pressure gas pipe may be parallel to the radial direction of the high pressure gas pipe, for example. However, since, for example, the inclined surfaces (contact surfaces) 14A and 14B in FIGS. 1 and 3 are inclined with respect to the radial direction of the high-pressure gas pipe, the sealing performance (air tightness) is more easily improved. preferable. Further, each of the contact surfaces may be flat or uneven, but the male screw portion of the high-pressure gas pipe and the female screw portion of the pipe joint are fitted and tightened (screwed). Therefore, a shape that allows the contact surfaces to be in close contact with each other is preferable. For example, like the slopes (contact surfaces) 14A and 14B in FIGS. 1 and 3, the respective contact surfaces may be flat without screws or the like. In addition, a screw is formed on each contact surface, and the male screw portion of the high-pressure gas pipe and the female screw portion of the pipe joint are fitted and tightened (screwed), so that the screws of the contact surfaces are screwed together. You may form so that it may closely contact.

  2 and 3, as described above, the tightening portions 13A and 13B of the high-pressure gas pipe 11 are positioned at the boundary portion (recessed portion) 23 between the outer surface of the pipe joint 11 and the high-pressure gas pipe 21, and tightened. The part 13 was welded together with the boundary part (concave part) 23. However, the present invention is not limited to this, and the tightening portion of the high-pressure gas pipe may not be located at a boundary portion between the pipe joint outer surface and the high-pressure gas pipe.

  2 and 3, the tightening portions 13A and 13B of the high-pressure gas pipe 11 are formed by two-sided cutting as described above. However, in the present invention, the shape of the tightening portion in the high-pressure gas pipe is not limited to a two-sided cut, and can be fitted with a tool for tightening the male screw portion (screwed into the female screw portion). Any shape can be used.

  Moreover, in the high-pressure gas pipe 11 and the pipe joint 21 shown in FIGS. 1 to 3, the dimensions of each part are not particularly limited, and can be set as appropriate according to required strength, pressure resistance performance, and the like. The dimensions of each part of the high-pressure gas pipe 11 and the pipe joint 21 are, for example, in accordance with the dimensions of general pipe joints and high-pressure gas pipes, or may be referred to, or may be changed arbitrarily. May be.

  Further, the materials of the high-pressure gas pipe 11, the pipe joint 21, and the weld metal 15 are not particularly limited. The material may be appropriately selected so that, for example, welding can be performed and strength sufficient to withstand the pressure of high-pressure gas can be obtained.

  Further, the pitch between the female screw portions 24A and 24B and the male screw portions 14A and 14B is not particularly limited, and may be a coarse screw or a fine screw, but a fine screw having a small pitch is preferably used. Thereby, the clearance gap of the junction part of female screw part 24A and male screw part 14A or female screw part 24B and male screw part 14B can be suppressed very small.

  The method of welding the high-pressure gas pipe 11 and the pipe joint 21 is not particularly limited. For example, the high-pressure gas pipe 11 and the pipe joint 21 may conform to a general welding method or may be referred to, or may be arbitrarily changed. good.

[Embodiment 2]
Furthermore, according to the pipe joint of the present invention, as described above, it is easy to finely adjust the angle between the pipes. Hereinafter, the specific example is demonstrated using FIGS.

  First, in the perspective views of FIGS. 4A and 4B, an example of a state in which the pipe joint 21 and one high-pressure gas pipe 11 are connected is schematically shown. 4 and FIGS. 5 to 7 described later, the pipe joint 21 and the high-pressure gas pipe 11 are illustrated with a simplified structure for convenience, but the pipe joint 21 and the high-pressure gas illustrated in FIGS. It has the same structure as the piping 11 for use.

  4A and 4B, the high-pressure gas pipe 11 has a bent portion 16 at one portion other than the vicinity of both ends (intermediate portion) as shown in the drawing. bent. 4A shows a state in which the connection state between the pipe joint 21 and the high-pressure gas pipe 11 is deviated from the target set angle, and FIG. 4B shows the pipe joint 21 and the high-pressure gas pipe. 11 shows a state in which the connection state with 11 is a target set angle. 4A and 4B show a state in which the pipe joint 21 and the high-pressure gas pipe 11 are not welded.

  Fig.5 (a) is the right view which looked at the state of Fig.4 (a) from the paper surface right side. FIG. 5B is a right side view of the state of FIG. 4B viewed from the right side of the drawing. As shown in FIG. 5A, the high-pressure gas pipe 11 is connected to the pipe joint 21 by being shifted from the target set angle by an angle θ501. From this state, by turning the pipe joint 11 to the right by the angle θ501, as shown in FIG. 5B, the angle deviation is eliminated and the target set angle is obtained. When the high pressure gas pipe 11 is turned to the right, the high pressure gas pipe 11 moves forward toward the inside of the pipe joint 21 or moves backward toward the outside. Which of the forward and backward movements is determined is that the threaded portion (the male threaded portion 12A and the female threaded portion 22A, or the male threaded portion 12B and the female threaded portion 22B) that connects the high-pressure gas pipe 11 and the pipe joint 21 is a right-hand thread. Or left-handed screw.

  Next, an example of a state where the pipe joint 21 and the two high-pressure gas pipes 11 are connected is schematically shown in the perspective views of FIGS. The two high-pressure gas pipes 11 in FIGS. 6 (a) and 6 (b) are bent at one place other than the vicinity of both ends (intermediate portion), similarly to FIGS. 4 (a) and 4 (b). The bent portion 16 is bent at a right angle. 6A shows a state in which the connection state between the pipe joint 21 and the high-pressure gas pipe 11 is deviated from the target set angle, and FIG. 6B shows the pipe joint 21 and the high-pressure gas pipe. 11 shows a state in which the connection state with 11 is a target set angle. In FIG. 6A, the ends of the two high-pressure gas pipes 11 that are not connected to the pipe joint 21 are shifted from parallel to each other to form an angle. FIG. 6B shows a state in which the ends of the two high-pressure gas pipes 11 that are not connected to the pipe joint 21 are parallel to each other. 6A and 6B show a state in which the pipe joint 21 and the high-pressure gas pipe 11 are not welded.

  How to change (correct) the state of FIG. 6A to the state of FIG. 6B will be specifically described below. First, in the state of FIG. 6A, the pipe joint 21 and the two high-pressure gas pipes 11 are connected and not yet welded. In this state, the connection portion between the pipe joint 21 and the two high-pressure gas pipes 11 can be expressed as shown in the cross-sectional view of FIG. As described above, one of the male screw portion 12A and the female screw portion 22A, and the male screw portion 12B and the female screw portion 22B is a right-hand thread and the other is a right-hand thread. Assuming that the male screw portion 12A and the female screw portion 22A are left-handed screws, and the male screw portion 12B and the female screw portion 22B are right-handed screws, the following results. First, the right-side high-pressure gas pipe 11 is turned slightly to the right when viewed from the right side of the drawing. Then, since the male screw portion 12 </ b> A and the female screw portion 22 </ b> A are left-handed, the right-side high-pressure gas pipe 11 slightly recedes toward the outside of the high-pressure gas pipe 21. Next, the high-pressure gas pipe 11 on the left side is turned slightly to the right when viewed from the left side of the page. Then, since the male screw portion 12B and the female screw portion 22B are right-hand threads, the left-side high-pressure gas pipe 11 slightly advances toward the inside of the high-pressure gas pipe 21. In this way, the two high-pressure gas pipes 11 are rotated in the opposite directions to finely adjust the angle, and can be changed (corrected) from the state shown in FIG. 6A to the state shown in FIG. 6B. it can. Further, as described above, one of the male screw portion 12A and the female screw portion 22A, and the male screw portion 12B and the female screw portion 22B is a right-hand thread and the other is a left-hand thread. For this reason, as described above, when the two high-pressure gas pipes 11 are rotated in the reverse direction, one high-pressure gas pipe 11 moves backward toward the outside of the high-pressure gas pipe 21 and the other high-pressure gas pipe 11 The pipe 11 advances toward the inside of the high-pressure gas pipe 21. Therefore, before and after the fine adjustment of the angle (the two high-pressure gas pipes 11 are rotated in the reverse direction), the slope 14A and the slope 14B shown in FIG. 3A can be kept in close contact with each other. . Thereby, as described above, the airtightness of the boundary portion between the two high-pressure gas pipes 11 is maintained (sealed), and the high-pressure gas can be prevented from leaking from the boundary. In addition, as described above, in the intermediate portion 24 (portion where no screw is formed) between the female screw portion 22A and the female screw portion 22B on the inner surface of the pipe joint 21, the male screw portion 12A of one high-pressure gas pipe, Any of the female threaded portion 12B of the other high-pressure gas pipe can enter. Thereby, in the intermediate part 24, the high pressure gas piping 11 can freely move forward and backward. Therefore, the angle between the two high-pressure gas pipes 11 can be finely adjusted as described above.

  Then, after finely adjusting the angle formed by the two high-pressure gas pipes 11 to the target set angle, as shown in FIG. 3B, the two high-pressure gas pipes 11 are respectively connected to the pipes. Weld with joint 21. As a result, the angle formed by the two high-pressure gas pipes 11 is accurate, the sealing performance (airtightness) between the pipe joint 21 and the two high-pressure gas pipes 11, and the two high-pressure gases. The pipe joint 21 and the two high-pressure gas pipes 11 can be connected in a state in which the sealing performance (airtightness) between the pipes 11 is maintained.

  In addition, although the state of FIG. 6B has been described as the target set angle, the present invention is not limited to this. For example, as shown in FIG. 6A, in the two high-pressure gas pipes 11, the ends that are not connected to the pipe joint 21 are shifted from parallel to each other to form an angle. The target set angle may be used. The angle formed by the two high-pressure gas pipes 11 is not limited to the state shown in FIG. 6 (a) and 6 (b) is bent at a right angle at one bent portion 16, the shape of the high pressure gas pipe 11 is not limited to this, and is arbitrary. It is. For example, the high-pressure gas pipe 11 may be straight, may be bent or curved at one place or any number of plural places, and the angle of bending or bending is not limited to a right angle, but is arbitrary. The angle is acceptable.

  FIGS. 8A and 8B show an example of a state in which two high-pressure gas pipes are connected by a conventional pipe joint. In FIG. 8A, two pipe joints 11b are connected by a pipe joint 21b. The two high-pressure gas pipes 11b in FIG. 8 (a) have a bent portion at one place (intermediate part) other than the vicinity of both ends, similarly to the high-pressure gas pipe 11 in FIG. 6 (a). The bent portion is bent at a right angle. Further, in FIG. 8A, as in FIG. 6A, the connection state between the pipe joint 21 and the high-pressure gas pipe 11 is deviated from the target set angle. As shown in FIG. 8A, the ends of the two high-pressure gas pipes 11b that are not connected to the pipe joint 21b deviate from the parallel state to form an angle.

  In the conventional pipe joint, it is difficult to finely adjust the angle between the two high-pressure gas pipes 11b at the connection portion with the pipe joint 21b from the state of FIG. Therefore, for example, as shown in FIG. 8 (b), another pipe joint 21c is provided at a position corresponding to the bent portion, and the angle is finely adjusted at the connection point between the pipe joint 21c and the high-pressure gas pipe 11b. It was. According to the present invention, even without the pipe joint 21c of FIG. 8 (b), for example, as described in FIGS. 6 (a) and 6 (b), the pipe joint 21 and the two high-pressure gas pipes 11 and The angle can be finely adjusted at the connection point. Thereby, in this invention, simplification of the structure of the piping mechanism containing the piping for high pressure gas and a piping joint is possible, for example, effects, such as cost reduction and high sealing performance (airtightness), can be acquired.

  By using the pipe joint of the present invention, for example, a pipe mechanism including a high-pressure gas pipe and a pipe joint can be configured. The overall structure and shape of the piping mechanism are arbitrary, and the number and shape of the high-pressure gas piping and piping joints are not particularly limited and are arbitrary. An example of such a piping mechanism is schematically shown in the perspective view of FIG. In the illustrated piping mechanism, four high-pressure gas pipes 11 are connected in series by three pipe joints 21. Two adjacent high-pressure gas pipes 11 are connected to each other by a pipe joint 21. As shown in FIG. 3B, the connecting portion between the pipe joint 21 and the two high-pressure gas pipes 11 is connected by a threaded portion and welded. In FIG. 7, two of the four high-pressure gas pipes 11 other than both ends have bent portions 16 at two locations, and each bent portion 16 is bent at a right angle. However, in the present invention, the shape of the high-pressure gas pipe is not limited to this, and is arbitrary as described above. Also, the number of high-pressure gas pipes and pipe joints is not limited to the configuration shown in FIG. 7 and is arbitrary. According to the present invention, for example, by configuring a high-pressure gas device incorporating such a piping mechanism, it is possible to provide a high-pressure gas device that can be simplified in structure and excellent in pressure resistance.

  The uses of the high-pressure gas pipe, the pipe joint, and the high-pressure gas apparatus of the present invention are not particularly limited, and may be used for any high-pressure gas. Specifically, the high-pressure gas pipe, the pipe joint, and the high-pressure gas device of the present invention are particularly excellent for hydrogen gas requiring high pressure, but are not limited to hydrogen gas. Can also be used. The high-pressure gas may be used as any one of (1) a toxic gas, (2) a flammable gas, and (3) a gas other than a toxic gas or a flammable gas. The pipe joint, high-pressure gas pipe, and high-pressure gas device of the present invention may be for high-pressure gas containing at least one of toxic gas and combustible gas, for example, as described above. As described above, the present invention is excellent in the airtightness of the connection portion between the pipe joint and the high-pressure gas pipe, so that gas leakage hardly occurs, and is suitable for, for example, a toxic gas and a flammable gas. In addition, as (1) toxic gas, although it does not specifically limit, For example, chlorine gas etc. are mentioned. (2) Although it does not specifically limit as combustible gas, For example, hydrogen gas etc. are mentioned. (3) The gas other than the toxic gas or the combustible gas is not particularly limited, and examples thereof include helium gas, nitrogen gas, and carbon dioxide gas.

  Although the apparatus for high pressure gas of this invention is not specifically limited, For example, a compression hydrogen stand etc. are mentioned. The structure of the high-pressure gas apparatus of the present invention is not particularly limited, and for example, a structure in which the piping and piping joint of a general high-pressure gas apparatus are replaced with the high-pressure gas piping and piping joint of the present invention. In addition, although it is possible to obtain pressure resistance (pressure strength) with only one of welding and screws, according to the present invention, as described above, the dimensional deviation is suppressed or prevented by using welding and screws together. It is possible, the structure can be simplified, and the pressure resistance is excellent. According to the apparatus for high-pressure gas of the present invention, for example, it is possible to withstand a design pressure required for a compressed hydrogen stand of 82 MPa or more or more (for example, 90 MPa or more, or 135 MPa or more). However, these numerical values of the pressure resistance performance are examples, and the present invention is not limited at all.

  In the high-pressure gas apparatus of the present invention, the high-pressure gas pipe and the pipe joint may all be used for the high-pressure gas pipe and the pipe joint. However, the apparatus for high-pressure gas of the present invention is not limited to this, and only one part or both of the high-pressure gas pipe and the pipe joint of the present invention are used in other parts, and any other high-pressure gas is used in other places. Pipes for pipes, pipe joints, etc. may be used. Specifically, for example, in the apparatus for high-pressure gas of the present invention, one or both of the high-pressure gas pipe and the pipe joint of the present invention is replaced with one of the high-pressure gas pipe and the pipe joint described in Japanese Patent No. 6057233 or You may use it in combination with both. The apparatus for high-pressure gas of the present invention may use, for example, one or both of the high-pressure gas pipe and the pipe joint of the present invention in combination with a conventional high-pressure gas pipe, a pipe joint, and the like. For example, use high-pressure gas pipes and pipe joints that use only a screw mechanism (no welding is required) so that they can be easily removed at places where regular maintenance is required. One or both of the high-pressure gas pipe and the pipe joint of the invention may be used. In this way, the structure can be simplified and high pressure resistance can be achieved, compared to high pressure gas pipes and pipe joints that use only screw mechanisms at all points (no need for welding). A device can be obtained. In this case, for example, as described above, it may be used in combination with one or both of the high-pressure gas pipe and the pipe joint described in Japanese Patent No. 6057233.

  As described above, according to the present invention, it is possible to suppress or prevent the dimensional deviation, the structure can be simplified, the pressure resistance is excellent, and the fine adjustment of the angle between the pipes is easy. A pipe joint, piping for high-pressure gas, a welding method, a method for manufacturing a device for high-pressure gas, and a device for high-pressure gas can be provided. According to the present invention, for example, when connecting high-pressure gas pipes with pipe joints, deviations in straightness, squareness, etc. between the high-pressure gas pipes stemming from manufacturing tolerances, sagging in welding, thermal strain, etc. Can be eliminated. The high-pressure gas pipe, pipe joint, welding method, high-pressure gas device manufacturing method, and high-pressure gas device of the present invention are excellent in pressure resistance, airtightness, etc. The above value is tremendous.

11, 11b High pressure gas pipes 12A, 12B Male thread portions 13A, 13B Clamping portions 14A, 14B Slope (contact surface)
15 Weld metal 16 Bent part 21, 21b, 21c Pipe joint 22A, 22B Female thread part 23 Recess 24 Intermediate part 201A, 201B Boundary part of pipe joint outer surface and female thread part

Claims (16)

A pipe joint that can be connected to a high-pressure gas pipe,
The pipe joint has a female thread portion for connecting to the end of the high-pressure gas pipe;
By fitting the male thread portion provided on the outer surface of the terminal of the high-pressure gas pipe to the female thread section of the pipe joint, the high-pressure gas pipe and the pipe joint can be connected,
Further, the high-pressure gas pipe and the pipe joint can be welded at the connection portion,
By connecting two female thread portions of the pipe joint in series, two high-pressure gas pipes can be connected,
Of aligned female threaded portion on the two series, one of the female threaded portion is a right-hand thread, the other of the female screw portion, Ri left Nejidea,
The one female screw portion and the other female screw portion are separated from each other;
In the intermediate portion between the one female screw portion and the other female screw portion, no screw is formed on the inner surface of the pipe joint,
In the intermediate portion, the two high-pressure gas pipes are brought into close contact with each other at the contact surfaces at the respective ends, whereby the airtightness of the boundary portion between the two high-pressure gas pipes can be maintained. pipe joint characterized in that it. The boundary between the pipe joint outer surface and the high-pressure gas pipe is formed to form an obtuse angle with respect to the outer surface of the high-pressure gas pipe,
The high pressure in the gas state connected to the pipe, the pipe joint outer surface with the pipe joint of claim 1, wherein the boundary which is weldable with the high-pressure gas pipe. The high-pressure gas pipe is formed by an inclined surface in which at least one of an outer surface and an inner surface at at least one end is inclined with respect to a radial direction of the high-pressure gas pipe,
Furthermore, a male thread part for connecting to the female thread part of the pipe joint on a part of the outer surface of the part other than the at least one end, and a tightening part for fitting a tool and tightening the male thread part a high-pressure gas pipe with claim 1 or 2 wherein the pipe joint. The piping joint according to any one of claims 1 to 3 , wherein the high-pressure gas includes at least one of a toxic gas and a combustible gas. The piping joint according to any one of claims 1 to 4 , wherein the high-pressure gas is hydrogen gas. The pipe joint according to any one of claims 1 to 5 , wherein the pipe joint is composed of only a single member. A pipe for high-pressure gas that can be connected to a pipe joint,
The pipe joint is the pipe joint according to any one of claims 1 to 6,
The high-pressure gas pipe, wherein the high-pressure gas pipe has the male screw portion and the contact surface. At each of both ends of the high-pressure gas pipe, at least one of the outer surface and the inner surface is formed by the contact surface that is a slope inclined with respect to the radial direction of the high-pressure gas pipe,
Furthermore, a male screw portion of a right-hand thread is formed on the outer surface close to one of the slopes, and a male screw portion of a left-hand screw is formed on the outer surface close to the other of the slopes,
The high pressure gas pipe according to claim 7, further comprising a tightening portion for fitting a tool to a part of an outer surface of the portion other than the slope and the male screw portion to fasten the male screw portion. In one of the two ends, the slope is formed on the outer surface of the high-pressure gas pipe,
The high-pressure gas pipe according to claim 8, wherein the inclined surface is formed on an inner surface of the high-pressure gas pipe at the other end of the both ends. The said male thread part in the piping for high pressure gas which has a male thread part is fitted by the said female thread part in the piping joint as described in any one of Claim 1 to 6 , and the said piping for high pressure gas and the said piping joint are connected. A welding method characterized by welding a boundary portion between the high-pressure gas pipe and the pipe joint outer surface in a state of being applied. The welding method according to claim 10, wherein the high-pressure gas pipe is the high-pressure gas pipe according to any one of claims 7 to 9 . The welding method according to claim 11, wherein the tightening portion of the high-pressure gas pipe is located at a boundary portion between the pipe joint outer surface and the high-pressure gas piping, and the tightening portion is welded together with the boundary portion. The manufacturing method of the apparatus for high pressure gas characterized by including the process of welding the said piping for high pressure gas and the said piping joint by the welding method as described in any one of Claim 10 to 12. Including a high-pressure gas pipe and the pipe joint according to any one of claims 1 to 6 ,
An apparatus for high-pressure gas, wherein a boundary portion between the high-pressure gas pipe and an outer surface of the pipe joint is welded in a state where the high-pressure gas pipe and the pipe joint are connected. The high-pressure gas apparatus according to claim 14, wherein the high-pressure gas pipe is the high-pressure gas pipe according to claim 7 . The device for high pressure gas according to claim 14 or 15, wherein a boundary portion between the pipe for high pressure gas and the outer surface of the pipe joint is welded by the welding method according to any one of claims 10 to 12.

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