Joint

Abstract

To provide a joint that can facilitate connection work to a pipe.SOLUTION: A joint includes: an outer sleeve 20; and a metal inner sleeve 60 including a throttle part 61 and an abutment surface 62 where a diameter is reduced toward one end side on an inside of an opening edge of the other end. Reducing a diameter of the throttle part connects a first pipe to be inserted into the inner sleeve through a first insertion port 21 to the inner sleeve, and also a metal second pipe including a male screw 36 at an outer surface is screwed to a female screw part 33 and pressed to the abutment surface, thereby connecting the second pipe to the inner sleeve. The outer sleeve is divided into a first outer sleeve 31 including the first insertion port and a tapered part 28 and a second outer sleeve 32 including a second insertion port 22 and a female screw part 24 and end parts thereof can be mutually screwed and joined. Screwing those end parts to each other reduces the diameter of the throttle part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a fitting. [Background technology]

[0002] 2. Description of the Related Art A known conventional joint is one in which pipes are connected to each other by inserting the pipes from both ends and then tightening the pipes (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5091191 (paragraphs

[0013] to

[0015] , Figures 1 and 2, etc.) Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional joints, the connection work is performed in a state where the pipes are inserted from both ends, which can make the work difficult. [Means for solving the problem]

[0005] One aspect of the invention includes an outer sleeve having a cylindrical shape, a first insertion opening at one end in an axial direction and a second insertion opening at the other end, a tapered portion inside that reduces in diameter toward the first insertion opening, and a female screw portion at an end on the other end side of the inside, and a metallic inner sleeve having a cylindrical shape, fitted into the outer sleeve, a drawn portion at one end in the axial direction that can be pressed against the tapered portion to reduce in diameter, and a tapered abutment surface on the inside of an opening edge of the other end that reduces in diameter, a second pipe made of metal having a male thread on its outer surface is screwed into the female thread portion and pressed against the abutment surface, thereby connecting the second pipe and the inner sleeve; the outer sleeve is divided into a first outer sleeve having the first insertion opening and the tapered portion, and a second outer sleeve having the second insertion opening and the female thread portion, and ends of the first outer sleeve and the second outer sleeve can be screwed together, and the first outer sleeve and the second outer sleeve are screwed together to reduce the diameter of the throttle portion. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a cross-sectional view of a joint according to a first embodiment. [Diagram 2] Figure 2 shows a cross-section of the fitting when the first pipe is inserted. [Diagram 3] FIG. 3 is a cross-sectional view of an inner sleeve in which a drawn portion is reduced in diameter and deformed when the first outer sleeve and the second outer sleeve are fastened together. [Figure 4] Figure 4 shows a cross-section of the fitting when the second pipe is connected. [Diagram 5] FIG. 5 is a cross-sectional view of a joint according to a second embodiment. [Figure 6] Figure 6 shows a cross-section of the fitting when the first pipe is inserted. [Figure 7]FIG. 7 is a cross-sectional view of an inner sleeve in which a drawn portion is reduced in diameter and deformed when a first outer sleeve and a second outer sleeve are fastened together. [Figure 8] Figure 8 shows a cross-section of the fitting when the second pipe is connected. [Figure 9] FIG. 9 is a cross-sectional view of a joint according to a third embodiment. [Figure 10] Figure 10 shows a cross-section of the fitting when the first pipe is inserted. [Figure 11] FIG. 11 is a cross-sectional view of an inner sleeve in which a drawn portion is reduced in diameter and deformed when a first outer sleeve and a second outer sleeve are fastened together. [Figure 12] Figure 12 is a cross-sectional view of the joint when the second pipe is connected. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] [First embodiment] 1 shows a joint 10 according to a first embodiment of the invention. The joint 10 has a structure in which a cylindrical inner sleeve 60 is fitted inside a cylindrical outer sleeve 20. In this embodiment, the inner sleeve 60 is housed midway through the outer sleeve 20 in the axial direction of the joint 10.

[0008] The joint 10 (specifically, the outer sleeve 20) has a first insertion opening 21 at one axial end (the right end in FIG. 1) and a second insertion opening 22 at the other axial end (the left end in FIG. 1). A first pipe 11 (see FIG. 2) is connected to the first insertion opening 21, and a second pipe 12 (see FIG. 4) is connected to the second insertion opening 22. In the following, one end of the joint 10, the outer sleeve 20, the inner sleeve 60, etc. will be referred to as the "right end" and the other end as the "left end" as appropriate.

[0009] As shown in FIG. 1, the small diameter portion 23, in which the inner diameter is the smallest, is provided in the middle of the axial direction (in the present embodiment, near the right end) inside the outer sleeve 20 (internal flow passage R). In the present embodiment, a ring member 70 is attached to the first insertion opening 21 of the outer sleeve 20. The ring member 70 has a short cylindrical fitting tubular portion 71 and a flange portion 72 that protrudes from the right end of the fitting tubular portion 71 in the circumferential direction of the joint 10. The fitting tubular portion 71 is fitted into a portion of the internal flow passage R of the outer sleeve 20 that is on the right end side of the small diameter portion 23. The flange portion 72 is overlapped with the opening edge of the first insertion opening 21 of the outer sleeve 20 in the axial direction. The ring member 70 is provided with an annular protruding portion 73 that protrudes inward from the inner circumferential surface of the fitting tubular portion 71.

[0010] In this embodiment, the inner diameter of the fitting tubular portion 71 of the ring member 70 is substantially the same as or larger than the inner diameter of the small diameter portion 23 of the outer sleeve 20. The protruding portion 73 protrudes inward from the inner circumferential surface of the small diameter portion 23. In this embodiment, the protruding portion 73 is inclined with respect to the central axis of the outer sleeve 20 so as to move toward the left end side (the other end side) toward the protruding tip side.

[0011] For example, the ring member 70 is made of an insulating material such as resin. In this embodiment, the ring member 70 is made of rubber. In this embodiment, the ring member 70 is disposed between the outer sleeve 20 and the first pipe 11 when the first pipe 11 is inserted into the first insertion opening 21, and is capable of preventing direct contact between them. By providing the ring member 70, for example, when the outer sleeve 20 and the first pipe 11 are made of different metals, it is possible to prevent corrosion caused by contact between the different metals.

[0012] In this embodiment, the inner flow passage R of the outer sleeve 20 is gradually reduced in diameter from the left end side to the small diameter portion 23. A female screw portion 24 is provided at the left end of the inner flow passage R of the outer sleeve 20. The female screw portion 24 is screwed into the male screw portion 12N of the second pipe 12 (see FIG. 4). In this embodiment, an annular groove 25U is formed on the inner peripheral surface of the outer sleeve 20 on the inner side (right end side) of the female screw portion 24, and an O-ring 25 is received therein. In this embodiment, a large diameter portion 26 having an inner diameter substantially the same as the inner diameter of the female screw portion 24 is provided on the further right end side of the annular groove 25U of the inner flow passage R of the outer sleeve 20. Furthermore, in the example of this embodiment, a medium diameter section 27 is formed by narrowing the diameter from the large diameter section 26 to the right end side by a step section 26D, and a taper section 28 is formed from the medium diameter section 27, narrowing in diameter in a tapered manner toward the right end side, and is connected to the small diameter section 23.

[0013] In this embodiment, the inner sleeve 60 is fitted over the large diameter portion 26, the medium diameter portion 27, and the tapered portion 28 in the outer sleeve 20, and is disposed so as to be accommodated therein. A tapered portion 61 is formed at one end (right end) in the axial direction of the inner sleeve 60. The tapered portion 61 has an outer diameter smaller than that of the other end (left end) of the inner sleeve 60 due to a step portion 60D, and is fitted over the medium diameter portion 27 and the tapered portion 28 of the outer sleeve 20. As will be described later, when the inner sleeve 60 is pressed from the left end side, the tapered portion 61 is pressed against the tapered portion 28 on the inner peripheral surface of the outer sleeve 20, and is capable of being deformed to reduce in diameter (see the change from FIG. 2 to FIG. 3). In detail, in the example of this embodiment, the throttle portion 61 extends to the right end side and has a claw portion 61T at its tip (right end portion) that protrudes inward, and the throttle portion 61 deforms (e.g., elastically deforms) so that the claw portion 61T moves inward.

[0014] In this embodiment, an abutment surface 62 that is tapered toward the right end side (i.e., female tapered) is formed on the inside of the opening edge on the left end side of the inner sleeve 60. As described later, the tapered portion 13 provided at the tip of the second pipe 12 abuts against the abutment surface 62, and a gap between the abutment surface 62 and the tapered portion 13 is sealed. The tapered portion 13 is shaped on the outside of the tip of the second pipe 12 that is tapered toward the tip side (i.e., male tapered). In this embodiment, at least a portion of the inner sleeve 60 including the abutment surface 62 is made of metal, and a portion of the second pipe 12 including the tapered portion 13 is made of metal, so that the abutment surface 62 and the tapered portion 13 are metal sealed. For example, the entire inner sleeve 60 may be made of metal, and the entire second pipe 12 may be made of metal.

[0015] Inside the inner sleeve 60 (internal flow path), an expanded diameter section 64 expanded by a step section 63 extends from the end on the far side (right end side) of the abutment surface 62 to the right end side and is connected to the throttle section 61. In this embodiment, the inner diameter of the expanded diameter section 64 is approximately the same as the inner diameter of the small diameter section 23 of the outer sleeve 20 and is larger (for example, slightly larger) than the outer diameter of the first pipe 11 inserted from the first insertion port 21. An annular groove 65U is formed on the inner circumferential surface midway through the expanded diameter section 64 of the inner sleeve 60, and an O-ring 65 is received therein.

[0016] As shown in FIG. 1, in this embodiment, the outer sleeve 20 is divided into a first outer sleeve 31 at one end (right end) and a second outer sleeve 32 at the other end (left end). The first outer sleeve 31 has a first insertion opening 21 and a tapered portion 28. The second outer sleeve 32 has a second insertion opening 22 and a female screw portion 24. In this embodiment, the first outer sleeve 31 and the second outer sleeve 32 are divided at a midpoint (e.g., a position toward the right end) of the large diameter portion 26 of the outer sleeve 20. For example, the outer circumferential surfaces of the first outer sleeve 31 and the second outer sleeve 32 have a shape (e.g., a substantially regular hexagonal cross section) that can be hooked with a tool (e.g., a wrench) that rotates the outer sleeves 31 and 32 relative to each other to tighten them.

[0017] One end (right end) of the second outer sleeve 32 has a male screw portion 36 on its outer circumferential surface which is reduced in diameter by a step portion 32D. The male screw portion 36 is screwed into the female screw portion 33 on the inside of the other end (left end) of the first outer sleeve 31. The inner circumferential surface of the first outer sleeve 31 is reduced in diameter by a step portion 31D on the inner side (right end side) of the female screw portion 33, and constitutes the right end of the large diameter portion 26 described above.

[0018] A recess 32U is formed on the edge of the right end opening of the second outer sleeve 32. A protrusion 68 protruding from a portion of the outer circumferential surface of the inner sleeve 60 on the left end side of the narrowed portion 61 is housed in the recess 32U. The protrusion 68 is sandwiched between the second outer sleeve 32 and the first outer sleeve 31 in the axial direction (in this embodiment, it is sandwiched between the stepped portions 32D and 31D). In this embodiment, the recess 32U is annular, and the protrusion 68 is also annular.

[0019] When assembling the joint 10, for example, the projection 68 of the inner sleeve 60 is received in the recess 32U of the second outer sleeve 32, and then the second outer sleeve 32 is screwed onto the inside of the first outer sleeve 31.

[0020] The joint 10 of this embodiment is connected to the first pipe 11 and the second pipe 12 as follows. First, the first outer sleeve 31 and the second outer sleeve 32 are screwed together to assemble the joint 10 with the inner sleeve 60 housed within the outer sleeve 20. At this time, the screwing is shallow (for example, by hand tightening) so that the drawn portion 61 of the inner sleeve 60 is not deformed by reducing its diameter (see FIG. 1).

[0021] 2, the first pipe 11 is inserted from the first insertion port 21 of the joint 10 (specifically, inserted inside the ring member 70). The first pipe 11 passes through the first outer sleeve 31 and is further inserted inside the inner sleeve 60, for example, until it abuts against the stepped portion 63. At this time, in this embodiment, the O-ring 65 seals the gap between the first pipe 11 and the inner sleeve 60. Note that since the inner diameter of the protruding portion 73 of the ring member 70 is smaller than the outer diameter of the first pipe 11, it deforms toward the left end and expands in diameter.

[0022] As shown in Fig. 3, the first outer sleeve 31 and the second outer sleeve 32 are screwed together further than the position shown in Fig. 2, for example, by tightening them with a tool. Then, since the second outer sleeve 32 (specifically, the recess 32U) and the inner sleeve 60 (specifically, the protrusion 68) are engaged with each other, the inner sleeve 60 is pressed by the second outer sleeve 32 against the first outer sleeve 31. As a result, the drawn portion 61 of the inner sleeve 60 is pressed against the tapered portion 28 of the first outer sleeve 31 and is deformed by reducing its diameter, and the claw portion 61T of the drawn portion 61 abuts against (e.g. bites into) the outer circumferential surface of the first pipe 11. As a result, the first pipe 11 is prevented from coming off the joint 10, and the first pipe 11 is connected to the inner sleeve 60 (joint 10). In this embodiment, the screwing is performed until the left end surface of the first outer sleeve 31 and the step portion 32D on the outer circumferential surface of the second outer sleeve 32 come into contact with each other (see FIG. 3). At this time, the step portion 26D on the inner circumferential surface of the first outer sleeve 31 come into contact with the step portion 60D on the outer circumferential surface of the second outer sleeve 32, but they do not have to come into contact with each other. In this embodiment, the step portion 31D of the first outer sleeve 31 and one end surface (right end surface) of the second outer sleeve 32 do not come into contact with each other, but they may come into contact with each other at the same time. When the screwing is deepened, it is sufficient that the second outer sleeve 32 or the inner sleeve 60 comes into contact with the first outer sleeve 31 in the axial direction, and therefore it is sufficient that at least one of the three places where the step portions 32D, 60D, and 31D come into contact with each other.

[0023] 4, the second pipe 12 is inserted into the outer sleeve 20 from the second insertion opening 22 while the male screw portion 12N is screwed into the female screw portion 24. Then, the tapered portion 13 at the tip of the second pipe 12 is pressed against the abutment surface 62 of the inner sleeve 60, and they are metal-sealed. As a result, the second pipe 12 is connected to the inner sleeve 60 (joint 10). At this time, in this embodiment, the O-ring 25 also seals between the second outer sleeve 32 and the second pipe 12.

[0024] In the above example, the first pipe 11 is connected to the fitting 10, and then the second pipe 12 is connected, but it is also possible to connect the second pipe 12 and then the first pipe in the reverse order.

[0025] Here, in the case where the outer sleeve is an integral part that is not divided into the first outer sleeve 31 and the second outer sleeve 32 as in the conventional joint, the second pipe 12 is what pushes the inner sleeve 60 from the other end side (left end side) to deform the diametrically reducing portion 61, so that the second pipe 12 needs to be tightened with both the first pipe 11 and the second pipe 12 inserted into the joint 10. Therefore, it may be difficult to connect these pipes 11 and 12. For example, in the case where the second pipe 12 is fixed to a fluid device, it is easier to connect the joint 10 and the first pipe 11 first and then connect the joint 10 and the second pipe 12.

[0026] In contrast, in the joint 10 of this embodiment, the outer sleeve 20 is divided into a first outer sleeve 31 and a second outer sleeve 32, which can be screwed together. Here, the first outer sleeve 31 has a first insertion opening 21, and the first pipe 11 is inserted through the first insertion opening 21. Then, when the first outer sleeve 31 and the second outer sleeve 32 are screwed together, the narrowed portion 61 of the inner sleeve 60 is pressed against the tapered portion 28 of the first outer sleeve 31 to reduce the diameter, and thus the first pipe 11 inserted inside the inner sleeve 60 is connected while being prevented from coming off. The second outer sleeve 32 has a second insertion opening 22 and a female screw portion 24, and is connected to the second pipe 12 screwed into the female screw portion 24. As a result, the inner sleeve 60 and the second pipe 12 are connected with a metal seal. Here, with the joint 10 of this embodiment, the connection to the first pipe 11 from the first outer sleeve 31 side and the connection to the second pipe 12 from the second outer sleeve 32 side can be performed independently of each other. Therefore, compared to conventional joints in which the connection work is performed with both the first pipe 11 and the second pipe 12 inserted, the degree of freedom in the connection work is increased, making it possible to improve the workability of the connection work.

[0027] [Second embodiment] 5 to 8 show a joint 10 of a second embodiment. In this embodiment, the second outer sleeve 32 and the inner sleeve 60 in the joint 10 of the first embodiment are not provided separately, but are integrated into a second outer sleeve 32V. Specifically, the second outer sleeve 32V is provided with the abutment surface 62 and the throttle portion 61 in the first embodiment. The O-ring 25 and the annular groove 25U are not provided. Other points are similar to those of the first embodiment.

[0028] With the joint 10 of this embodiment, the first pipe 11 can be connected from the first outer sleeve 31 side and the second pipe 12 can be connected from the second outer sleeve 32V side independently of each other. Therefore, compared to conventional joints in which the connection work is performed with both the first pipe 11 and the second pipe 12 inserted, the degree of freedom of the connection work is increased, and the workability of the connection work can be improved. Furthermore, according to this embodiment, it is possible to reduce the number of parts.

[0029] When the second pipe 12 is screwed into the second outer sleeve 32V, the tapered portion 13 at the tip of the second pipe 12 slides against the abutment surface 62, so a packing or the like may be sandwiched between them. This makes it possible to further improve the sealing performance between the tapered portion 13 and the abutment surface 62.

[0030] [Third embodiment] 9 to 12 show a joint 10 of a third embodiment. This embodiment differs from the joint 10 of the second embodiment in that a portion including the narrowed portion 61 on the right end side of the stepped portion 60D in the second outer sleeve 32V is separated as an inner sleeve 60V. Other points are the same as those of the second embodiment.

[0031] The constricted portion 61 is sandwiched between the first outer sleeve 31 (the tapered portion 28 of the first outer sleeve 31) and the second outer sleeve 32V (one end of the second outer sleeve 32V), and is pressed against the first outer sleeve 31 and the second outer sleeve 32V and deformed to reduce in diameter as the screw engagement between the first outer sleeve 31 and the second outer sleeve 32V deepens. This reduction in diameter deformation prevents the first pipe from coming off the fitting 10, as in the first and second embodiments.

[0032] With the joint 10 of this embodiment as well, the connection of the first pipe 11 from the first outer sleeve 31 side and the connection of the second pipe 12 from the second outer sleeve 32V side can be performed independently of each other. Therefore, compared to conventional joints in which the connection work is performed with both the first pipe 11 and the second pipe 12 inserted, the degree of freedom in the connection work is increased, making it possible to improve the workability of the connection work.

[0033] In this embodiment, when the second pipe 12 is screwed into the second outer sleeve 32V, the tapered portion 13 at the tip of the second pipe 12 slides against the abutment surface 62, so a packing or the like may be sandwiched between them. This makes it possible to further improve the sealing performance between the tapered portion 13 and the abutment surface 62.

[0034] [Other embodiments] In the above first embodiment, the protrusion 68 of the inner sleeve 60 is received into the recess 32U of the second outer sleeve 32 and they engage with each other in a concave-convex manner, but the configuration may be reversed, where the protrusion of the second outer sleeve 32 is received into the recess of the inner sleeve 60 and they engage with each other in a concave-convex manner.

[0035] The joint 10 of the above embodiment may be configured without the ring member 70.

[0036] <Additional Notes> The following describes the feature groups extracted from the above-described embodiments, while indicating their effects, etc., as necessary. Note that, in the following, for ease of understanding, the corresponding configurations in the above-described embodiments are appropriately indicated in parentheses, but these feature groups are not limited to the specific configurations indicated in parentheses.

[0037] For example, the following group of features can be considered to have been conceived in response to the problem that "in the above-mentioned conventional joints, the connection work is performed with the pipes inserted from both ends, which can make the work difficult," in relation to the background art that states, "Conventional joints are known in which pipes are connected to each other by inserting the pipes from both ends and then tightening the joints (see, for example, Patent No. 5091191 (paragraphs

[0013] to

[0015] , Figures 1 and 2, etc.))." There is also a demand for the development of new technologies related to joints.

[0038] [Feature 1] an outer sleeve having a cylindrical shape, a first insertion opening at one end in an axial direction and a second insertion opening at the other end, a tapered portion inside the outer sleeve that reduces in diameter toward the first insertion opening, and a female screw portion at an end portion on the other end side of the inner portion; a metallic inner sleeve having a cylindrical shape, the inner sleeve being fitted into the outer sleeve, the inner sleeve having a tapered portion at one end in the axial direction that can be pressed against the tapered portion to reduce in diameter, and a tapered abutment surface at the inside of an opening edge at the other end that reduces in diameter toward the one end, a first pipe inserted into the inner sleeve through the first insertion opening is connected to the inner sleeve by reducing the diameter of the tapered portion, and a second pipe made of metal having a male thread on its outer surface is screwed into the female thread portion and pressed against the abutment surface, thereby connecting the second pipe to the inner sleeve, the outer sleeve is divided into a first outer sleeve having the first insertion opening and the tapered portion, and a second outer sleeve (second outer sleeve 32) having the second insertion opening and the female screw portion, and ends of the first outer sleeve and the second outer sleeve can be screwed together, A joint in which the first outer sleeve and the second outer sleeve are screwed together, thereby reducing the diameter of the throttle portion.

[0039] [Feature 2] 2. The joint according to claim 1, wherein the inner sleeve has an outer surface provided with a protrusion that is sandwiched between the first outer sleeve and the second outer sleeve.

[0040] [Feature 3] a metallic outer sleeve having a cylindrical shape, a first insertion opening at one end in an axial direction and a second insertion opening at the other end, a tapered portion inside the sleeve that reduces in diameter toward the first insertion opening, a female screw portion at an end on the other end side of the inside of the sleeve, and a tapered abutment surface between the tapered portion and the female screw portion that reduces in diameter toward the one end side in the axial direction; an inner sleeve (inner sleeve 60V) having a cylindrical shape, fitted into the outer sleeve, and having a tapered portion at one end in the axial direction that can be pressed against the tapered portion to reduce its diameter; the outer sleeve is divided into a first outer sleeve having the first insertion opening and the tapered portion, and a second outer sleeve (second outer sleeve 32V) having the second insertion opening, the female screw portion, and the abutment surface, end portions of the first outer sleeve and the second outer sleeve can be screwed together, and the inner sleeve is sandwiched between the tapered portion of the first outer sleeve and one end of the second outer sleeve in the axial direction, A joint in which the first outer sleeve and the second outer sleeve are screwed together, such that the inner sleeve is pressed against one end of the second outer sleeve in the axial direction and connected to the second outer sleeve, and the narrowed portion is reduced in diameter, connecting a first pipe inserted into the inner sleeve through the first insertion port to the inner sleeve, and a second metal pipe having a male thread on its outer surface is screwed into the female thread portion and pressed against the abutment surface, thereby connecting the second pipe to the second outer sleeve.

[0041] [Feature 4] a metallic outer sleeve having a cylindrical shape, a first insertion opening at one end in an axial direction and a second insertion opening at the other end, a tapered portion inside the metallic outer sleeve that reduces in diameter toward the first insertion opening, and a female screw portion at an end portion on the other end side of the inside of the metallic outer sleeve; the outer sleeve is divided into a first outer sleeve having the first insertion opening and the tapered portion, and a second outer sleeve (second outer sleeve 32V) having the second insertion opening and the female screw portion, and ends of the first outer sleeve and the second outer sleeve can be screwed together, the second outer sleeve has a tapered portion at one end in the axial direction, the tapered portion being fitted into the first outer sleeve and being pressed against the tapered portion to be deformed and reduced in diameter, and the second outer sleeve has a tapered abutment surface between the tapered portion and the female screw portion, the abutment surface being tapered in diameter toward the one end in the axial direction, A joint in which the first outer sleeve and the second outer sleeve are screwed together, thereby reducing the diameter of the constricted portion, and a first pipe inserted into the first outer sleeve through the first insertion port is connected to the second outer sleeve, and a second metal pipe having a male thread on its outer surface is screwed into the female thread portion and pressed against the abutment surface, thereby connecting the second pipe to the second outer sleeve.

[0042] According to the joint having the above features 1 to 4, the operation of connecting to a pipe can be easily performed.

[0043] In addition, although this specification and drawings disclose specific examples of the technology included in the scope of the claims, the technology described in the claims is not limited to these specific examples, but includes various modifications and variations of the specific examples, as well as parts of the specific examples taken alone. [Explanation of symbols]

[0044] 10 Joints 11 First Pipe 12 Second Pipe 12N Male thread 13 Tapered section 20 Outer Sleeve 21 First insertion slot 22 Second insertion slot 24 Female thread 28 Tapered section 31 First outer sleeve 32 Second outer sleeve 32U recess 32V 2nd outer sleeve 33 Female thread 36 Male thread part 60 Inner Sleeve 60V inner sleeve 61 Squeezing section 62 Contact surface 68 Protrusion

Claims

1. an outer sleeve having a cylindrical shape, a first insertion opening at one end in an axial direction and a second insertion opening at the other end, a tapered portion inside the outer sleeve that reduces in diameter toward the first insertion opening, and a female screw portion at an end portion on the other end side of the inner portion; a metallic inner sleeve having a cylindrical shape, the inner sleeve being fitted into the outer sleeve, the inner sleeve having a tapered portion at one end in the axial direction that can be pressed against the tapered portion to reduce in diameter, and a tapered abutment surface at the inside of an opening edge at the other end that reduces in diameter toward the one end, a first pipe inserted into the inner sleeve through the first insertion opening and the inner sleeve are connected by a diameter reduction of the tapered portion, and a second pipe made of metal having a male thread on an outer surface thereof is screwed into the female thread portion and pressed against the abutment surface, thereby connecting the second pipe and the inner sleeve; the outer sleeve is divided into a first outer sleeve having the first insertion opening and the tapered portion, and a second outer sleeve having the second insertion opening and the female screw portion, and ends of the first outer sleeve and the second outer sleeve can be screwed together, A joint in which the first outer sleeve and the second outer sleeve are screwed together, thereby reducing the diameter of the reduced portion.

2. 2. The joint according to claim 1, wherein an outer surface of the inner sleeve is provided with a protrusion that is sandwiched between the first outer sleeve and the second outer sleeve.

3. a metallic outer sleeve having a cylindrical shape, a first insertion opening at one end in an axial direction and a second insertion opening at the other end, a tapered portion inside the sleeve that reduces in diameter toward the first insertion opening, a female screw portion at an end on the other end side of the inside of the sleeve, and a tapered abutment surface between the tapered portion and the female screw portion that reduces in diameter toward the one end side in the axial direction; an inner sleeve having a cylindrical shape, the inner sleeve being fitted into the outer sleeve, and the inner sleeve having a tapered portion at one end in the axial direction, the tapered portion being capable of being pressed against the tapered portion to reduce its diameter; the outer sleeve is divided into a first outer sleeve having the first insertion opening and the tapered portion, and a second outer sleeve having the second insertion opening, the female screw portion, and the abutment surface, ends of the first outer sleeve and the second outer sleeve are capable of being screwed together, and the inner sleeve is sandwiched between the tapered portion of the first outer sleeve and one end of the second outer sleeve in the axial direction, When the first outer sleeve and the second outer sleeve are screwed together, the inner sleeve is pressed against one end of the second outer sleeve in the axial direction to connect with the second outer sleeve, and the narrowed portion is reduced in diameter to connect a first pipe inserted into the inner sleeve through the first insertion port to the inner sleeve, and a second metal pipe having a male thread on its outer surface is screwed into the female thread portion and pressed against the abutment surface to connect the second pipe to the second outer sleeve.

4. a metallic outer sleeve having a cylindrical shape, a first insertion opening at one end in an axial direction and a second insertion opening at the other end, a tapered portion inside the metallic outer sleeve having a diameter decreasing toward the first insertion opening, and a female screw portion at an end portion on the other end side of the inside of the metallic outer sleeve; the outer sleeve is divided into a first outer sleeve having the first insertion opening and the tapered portion, and a second outer sleeve having the second insertion opening and the female screw portion, and ends of the first outer sleeve and the second outer sleeve can be screwed together, the second outer sleeve has a tapered portion at one end in the axial direction, the tapered portion being fitted into the first outer sleeve and being pressed against the tapered portion to be deformed to reduce in diameter, and the second outer sleeve has a tapered abutment surface between the tapered portion and the female screw portion, the abutment surface reducing in diameter toward the one end in the axial direction, When the first outer sleeve and the second outer sleeve are screwed together, the narrowing portion reduces in diameter, connecting a first pipe inserted into the first outer sleeve through the first insertion port to the second outer sleeve, and a second metal pipe having a male thread on its outer surface is screwed into the female thread portion and pressed against the abutment surface, thereby connecting the second pipe to the second outer sleeve.

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