JP6043771B2 - Union nut joint connection device and connection method using the same - Google Patents

Description

  The present invention relates to a connection device for a union nut joint and a connection method using the same. More specifically, a connection device for a union nut joint for connecting a joint main body having a receiving portion with a male thread engraved on the outer peripheral surface and a union nut joint having a union nut screwed and tightened to the receiving portion close to each other And a connection method using the same.

  2. Description of the Related Art Conventionally, a pipe detachment preventing device for a union nut joint as shown in Patent Documents 1 and 2, for example, is known. The pipe detachment preventing device 100 prevents the detachment of the pipe by connecting a C ring-shaped retaining ring 101 attached to the joining pipe 10 or the like to the union nut 4 by a locking metal fitting 102. For example, as shown in FIG. 29, even if the joint main bodies 3 attached with the pipe detachment preventing device 100 are brought close to each other, they cannot be made closer than the width W of the retaining ring 101. In addition, the expansion / contraction amount S of the pipe due to water pressure must be taken into consideration, and a distance A between joints that is equal to or greater than the sum of the width W of the retaining ring 101 and the expansion / contraction amount S must be ensured. This distance A is, for example, about 58 mm at a nominal diameter of 50 mm, and about 50 mm at a nominal diameter of 25 mm, and there is a physical limit to approach the pipe joint. In addition, in the case of expanding and contracting, since the distance A greatly changes when the water pressure is applied, the distance A cannot be set to the designated dimension.

JP 2005-233379 A JP 2009-30761 A

  In view of such a conventional situation, the present invention provides a connection device for a union nut joint that can prevent unplugging of a pipe or a metal fitting and can connect the union nut joints to each other by simple construction and uses the same. The purpose is to provide a connection method.

  In order to achieve the above object, a connection device for a union nut joint according to the present invention is characterized in that a joint body having a receiving portion with a male thread engraved on the outer peripheral surface, and a union nut screwed and tightened to the receiving portion. In the configuration in which the union nut joints provided are connected in proximity to each other, a joining pipe inserted into the opposing receiving port part and a latching member having a pair of latching parts latching on the opposing union nut are provided, The tube has an abutting portion that abuts against each opening of the opposing union nut, and the latch member is composed of a pair of arcuate members that are clamped and fixed at one end by a clamping means. The opening angle between the other ends of the pair of arcuate members is less than 180 °, and the pair of latching portions are provided facing each other along the longitudinal direction of the arcuate member, and a recess is provided therebetween. Forming the recess, the It is to cover at least a portion of the union nut which direction.

  A connection device for a union nut joint according to the present invention includes a latching member having a pair of latching portions that latch on a union nut facing a joining pipe inserted into an opposing receiving port, and through these members. Directly connect union nut joints close to each other. According to the above configuration, since the joining pipe has the abutting portion that abuts each opening of the opposing union nut, the approachable distance is the width of the abutting portion, and the union nut joints are arranged to face each other very close to each other. be able to. And since a latching member is comprised from a pair of circular-arc-shaped member clamp | tightened and fixed by a clamping means at one end, it can construct by the clamping operation | work in one place and workability | operativity is high. And since the opening angle between the other ends of a pair of circular-arc-shaped member is less than 180 degrees in the clamp | tightened state, a latching member does not drop from a coupling. And since a pair of latching | locking part is provided facing along a longitudinal direction, since the load which concerns on a latching part is borne in good balance, it becomes strong with respect to the detachment | desorption force of a pipe | tube. And since the recessed part covers at least one part of the union nut which opposes, the latching member itself does not inhibit the proximity | contact of a coupling. In this way, the union nut joints can be brought close to each other and firmly connected.

  The opening width of the pair of latching portions between the other ends of the pair of arcuate members fixed by fastening is smaller than the outer diameter of the fitting portion of the union nut into which the latching portions are fitted. Good. Further, the opening width of the recess between the other ends of the pair of arcuate members fastened and fixed is smaller than the outer diameter of the hooked portion of the union nut on which the hooking portion is hooked. May be. By at least one of these, the opening width of the latching member is smaller than the outer diameter of the union nut, and the latching member is more reliably prevented from falling off.

  The arcuate member has a through hole through which the tightening means penetrates at the one end, and the through hole is between the other ends of the pair of arcuate members in a loosened state of the tightening means. The other end of the pair of arcuate members when the opening width of the pair of latching portions is larger than the outer diameter of the fitting portion of the union nut into which the latching portion is fitted and the tightening means is loosened It is preferable that the opening width of the recess in the middle is formed in a tapered shape so as to be larger than the outer diameter of the hooked portion of the union nut that holds the hooking portion. Thus, since the pair of arcuate members connected by the tightening means in the loosened state can be mounted, it is not necessary to separate the pair of arcuate members, and the working efficiency is improved.

  The inner diameter of the pair of hooking portions is larger than the outer diameter of the fitting portion of the union nut that fits the hooking portion, and smaller than the outer diameter of the hooked portion of the union nut that hooks the hooking portion. The inner diameter of the recess is preferably larger than the outer diameter of the hooked portion of the union nut that hooks the hooking portion. Thereby, since play occurs in the hooked state, it can be expanded and contracted between the joints (connection portion).

  On the other hand, you may make it have a projection part which contacts the insertion part of the said union nut which inserts the said latching part in at least one part of a pair of said latching part. In such a case, since the protruding portion comes into contact with and presses the fitting portion, the expansion / contraction flexibility of the tube can be suppressed and temporarily fixed.

  The opposing union nut may have a flange provided in the opening and an annular recess adjacent to the flange, and the latching portion may be fitted into the annular recess and latched on the flange. In addition, at least one of the opposing union nuts has a flange provided in the opening and an annular recess adjacent to the flange, and one of the pair of latching portions is fitted into the annular recess of one union nut. The other latching portion may be latched to the second opening of the other union nut. Furthermore, you may make it a pair of said latching part latch in the 2nd opening part of the said union nut which opposes. In any feature configuration, the union nuts can be connected to each other.

  The recess may be provided with an elastic member. Thereby, for example, vibration in the exposed piping can be absorbed, and rotation and dropout due to vibration can be prevented and noise can be suppressed.

  The contact portion may be a separate body from the tube main body of the joint tube, and the contact portion may be formed integrally with the tube main body of the joint tube. Moreover, the said contact part may further have an elastic member, and the said contact part may be comprised from an elastic member.

  In order to achieve the above object, the union nut joint connection method according to the present invention is characterized in that, in the connection method using the union nut joint connection device according to any one of the above characteristic configurations, the joint pipe is opposed to each other. The fastening means is inserted into the mouth, the abutting portions of the joining pipe are brought into contact with the openings of the opposing union nuts, the pair of engaging portions are respectively engaged with the opposing union nuts, and the fastening means Thus, the pair of arcuate members is fastened and fixed.

  According to the connection device of the union nut joint according to the present invention and the characteristics of the connection method using the same, it is possible to connect the union nut joints close to each other with simple construction by preventing the pipe from being detached or the metal fitting from falling off. It has become possible.

  Other objects, configurations, and effects of the present invention will become apparent from the following embodiments of the present invention.

It is a disassembled perspective view of the connection apparatus of the union nut joint concerning the present invention. It is a perspective view which shows the example of a connection of the union nut coupling using a connection apparatus. It is a principal part cross-sectional view of a connection apparatus. FIG. 4 is a view corresponding to FIG. 3 in a state where water pressure is applied. (A) is a front view after fastening of a latching member, (b) is the sectional view on the AA line of (a). (A) is a front view of the state which loosened the fastening means of a latching member, (b) is the BB sectional drawing of (a). It is a figure explaining the connection procedure of a union nut coupling. It is a figure explaining the connection procedure of a union nut coupling. It is a figure explaining the connection procedure of a union nut coupling. It is a figure explaining the connection procedure of a union nut coupling. It is a figure which shows the modification of a joining pipe | tube, (a) is a horizontal piece side sectional drawing, (b) is a longitudinal cross-sectional view. FIG. 12 is a view corresponding to FIG. 11 showing another modified example of the joined pipe. FIG. 12 is a view corresponding to FIG. 11 showing still another modified example of the joining pipe. FIG. 12 is a view corresponding to FIG. 11 showing still another modified example of the joining pipe. FIG. 12 is a view corresponding to FIG. 11 showing still another modified example of the joining pipe. FIG. 12 is a view corresponding to FIG. 11 showing still another modified example of the joining pipe. It is a horizontal piece side sectional view showing other modification of a joined pipe. It is a figure which shows 2nd embodiment of this invention, (a) is the partial expanded side view of the state which attached the connection apparatus, (b) is a front view of a latching member. It is CC sectional view taken on the line of FIG.18 (b). FIG. 19 is a view corresponding to FIG. 18 according to a third embodiment of the present invention. It is DD sectional view taken on the line of FIG.20 (b). It is a figure which shows other embodiment of this invention. FIG. 12 is a view corresponding to FIG. 11 showing still another modified example of the joining pipe. FIG. 24 is a view corresponding to FIG. 3 of a connection device using the joining pipe of FIG. 23. It is a front view which shows the example of a modification of a latch. FIG. 26 is a view corresponding to FIG. 3 of a connection device using the retaining metal fitting of FIG. 25. FIG. 12 is a view corresponding to FIG. 11 showing still another modified example of the joining pipe. It is FIG. 3 equivalent view of the connection apparatus using the joining pipe of FIG. It is a figure which shows the state of proximity | contact arrangement | positioning in the conventional union nut coupling.

Next, the first embodiment of the present invention will be described in more detail with reference to FIGS.
The union nut joint connecting device 1 according to the present invention is, for example, as shown in FIG. 2, screwed and tightened to a joint body 3 having a receiving portion 33 in which a male screw 32 is engraved on an outer peripheral surface 31 and a receiving portion 33. This is for connecting and fixing the union nut fitting 2 provided with the union nut 4 adjacent to each other. The union nut 4 in the present embodiment includes an annular recess 42 formed on the outer peripheral surface 41 and a flange 43 erected on the opening 40. In the present embodiment, the annular recess 42 is an insertion portion into which a later-described engagement portion 22 is inserted, and the flange 43 is an engagement portion that engages the engagement portion 22.

  As shown in FIGS. 1 to 4, the connecting device 1 is generally hung on the joint pipe 10 inserted into the opposite receiving ports 33, 33 of the adjacent joint bodies 3, 3 and the union nuts 4, 4 facing each other. And a latching member 20 having a pair of latching portions 22 and 22 to be stopped.

  As shown in FIGS. 1, 3, and 4, the joining tube 10 includes a tube body 11 and an annular contact portion 12 that contacts the openings 40 and 40 of the opposing union nuts 4 and 4. The contact portion 12 protrudes from the surface of the tube body 11. The contact portion 12 positions the joint when the joining pipe 10 is inserted, and prevents excessive insertion into the receiving portion 33. And as shown in FIG. 3, since the contact part 12 is made to contact | abut to each opening part 40 and 40, it becomes possible to adjoin by the thickness t1 of the contact part 12. FIG. The thickness t1 is, for example, about 2 to 5 mm, and the installation space can be greatly reduced.

  By the way, in the case of the standing pipe, the joint pipe must be temporarily tightened with the union nut 4 in a state in which the joint pipe is inserted into the receiving port 33 and held at a predetermined position, so that It becomes work. If it is the joining pipe | tube 10 which provided the contact part 12 as mentioned above, since the contact part 12 can be contact | abutted to the opening part 40 of the union nut 4, it can position by one worker, and work efficiency is sufficient. Can be significantly improved.

  1-4, the latching member 20 in this embodiment is comprised from a pair of circular-arc-shaped members 21 and 21 fastened and fixed by the fastening means 29 which consists of the volt | bolt 29a and the nut 29b at one end. . The arcuate member 21 is provided with a pair of latching portions 22, 22 that are opposed along the longitudinal direction over the entire length thereof, and a recess 23 is formed therebetween. The concave portion 23 covers at least a part of the outer peripheral surface 41 of the union nuts 4 and 4 that are opposed to each other during mounting. Further, at one end of the arcuate member 21, a plate-like attachment portion 24 to which the fastening means 29 is attached is provided.

  Here, as shown in FIG. 5, the opening angle θ between the other ends 21z and 21z of the pair of arc-shaped members 21 and 21 fastened and fixed is set to be less than 180 °. And the opening width D1 of the latching | locking part 22 between the other ends 21z and 21z of a pair of arc-shaped members 21 and 21 fastened and fixed is smaller than the outer diameter R1 of the annular recessed part 42. The opening width D2 of the recess 23 between the other ends 21z, 21z of the pair of arcuate members 21, 21 that are fastened and fixed is smaller than the outer diameter R2 of the flange 43. In the present embodiment shown in the figure, all the dimensional conditions are satisfied, but it is sufficient that at least one of the dimensional conditions is satisfied. Under any of the dimensional conditions, the pair of arc-shaped members 21 and 21 that are fastened and fixed do not fall off the union nut 4 and the connection between the union nut joints 2 and 2 is not released.

  As shown in FIG. 5, flanges 43 and 43 of the opposing union nuts 4 and 4 are accommodated in the recess 23 in the present embodiment. Between the flanges 43, 43, the contact portion 12 of the joining pipe 10 is located. Therefore, the width T of the recess 23 is preferably larger than the sum of the width t1 of the flange 43 and the width t2 of the contact portion 12. For example, as shown in FIG. 3, in the present embodiment, the pair of latching portions 22, 22 are fitted into the annular recess 42 with a gap t <b> 0 from the flange 43. Due to this gap t0, the tube is allowed to expand and contract by that distance, and as shown in FIG. 4, the flange 43 of the union nut 4 abuts against the latching portion 22, so that the tube is prevented from being detached.

  Further, as shown in FIG. 5B, the inner diameter r1 of the pair of latching portions 22 and 22 is larger than the outer diameter R1 of the annular recess 42 and smaller than the outer diameter R2 of the flange 43, and the inner diameter of the recess 23 r2 is larger than the outer diameter R2 of the flange 43. Thereby, spaces C1 and C2 are formed in the pipe diameter direction between the latching portion 22 and the annular recess 42 and between the recess 23 and the flange 43, respectively. Therefore, since the members are not in contact with each other by the spaces C1 and C2, the connecting portion of the joint can be flexed.

  As shown in FIGS. 5 and 6, the attachment portion 24 is formed with a tapered through hole 24 a through which the bolt 29 a passes. As shown in FIG. 6, the through-hole 24 a has an opening width D 3 of the latching portion 22 in a state where the tightening means 29 is loosened and is larger than the outer diameter R 1 of the annular recess 42. The opening width D4 of the recess 23 in the loosened state is formed to be larger than the outer diameter R2 of the flange 43. Thereby, since the latching member 20 can be attached to the union nut 4 in a state where the tightening means 29 is loosened without separating the pair of arcuate members 21 and 21, workability is good. In addition, since the mounting portion 24 is formed only at one end of the arcuate member 21, the fastening means 29 needs to be fastened at only one place, so that workability is good and construction can be performed quickly. By tightening the fastening means 29, the attachment portion 24 comes into contact with the outer end portions 24b of the attachment portion 24 and also comes into contact with the inner end portions 24c. A space C <b> 1 is formed between the latching portion 22 of the latching member 20 and the annular recess 42 of the union nut 4.

Next, the connection method of a union nut joint is demonstrated, referring FIGS.
In the present embodiment, as shown in FIG. 7, first, an annular projecting portion 12 is attached to the pipe body 11 to form the joining pipe 10, and the joining pipe 10 is inserted into the union nut 4 of the pipe joint 2. Then, as shown in FIG. 8, the abutting portion 12 is abutted against the opening 40 of the union nut 4 to position the joining pipe 10, and the other end of the joining pipe 10 is connected to the union nut 4 of another pipe joint 2. Insert. Next, as shown in FIG. 9, a pair of arcuate members 21, 21 (with the tightening means 29 loosened in a state where the opening portions 40, 40 of each union nut 4 are in contact with the protruding portion 12 ( The retaining member 20) is mounted so as to cover the outer surface of the union nut 4. At the time of mounting, as described above, the pair of hook portions 22, 22 of each arcuate member 21 are fitted into the respective annular recesses 42 and hooked to the flange 43. And as shown in FIG. 10, the mounting | wearing of the latching member 20 is completed by tightening the clamping member 29. FIG. In this way, for example, a T-type pipe joint and an L-type pipe joint can be disposed close to each other with the thickness t1 of the contact portion 12, and the installation space can be greatly reduced.

Here, a modified example of the bonded tube 10 will be described with reference to FIGS.
In the first embodiment, as shown in FIG. 7, the joining portion 10 is formed by attaching the contact portion 12, which is separate from the tube body 11, to the tube body 11. In such a case, for example, as shown in FIG. 11, a groove 13 for mounting the contact portion 12 on the tube body 11 may be formed. As the contact portion 12, for example, a ring-shaped plastic plate is used. As shown in FIG. 12, the contact portion 12 may be constituted by an elastic member 12a such as a rubber flange or a rubber O-ring. Furthermore, as shown in FIG. 13, an elastic member 12 b such as a molded rubber plate having a tapered rib 14 may be used as the contact portion 12. The contact portions 12a to 12c may be fitted into the groove 13 described above, or may be bonded to the tube body 11 or the groove 13 with an adhesive. Further, the elastic members 12 a and 12 b may be formed so that the inner diameter thereof is smaller than the outer diameter of the pipe and temporarily fixed to the pipe body 11. Further, for example, a C-shaped bracket 16 as shown in FIG. 16 can be used as the contact portion 12 that is separate from the tube body 11. In addition, the pipe body 11 in these modified examples is, for example, a polyethylene pipe, a hard vinyl chloride pipe, or a steel pipe.

  Moreover, as shown in FIG. 14, in the metal pipe main body 11a, as the contact part 12, for example, a convex part 12c may be integrally formed on the pipe main body 11. In such a case, as shown in FIG. 15, the coating layer 15 may be provided by painting the inner and outer surfaces and end surfaces of the tube body 11. In addition, as shown in FIG. 17, it is also possible to compress and deform the metal tube main body 11 a as the contact portion 12 to form a convex deformation portion 12 d. In addition, castings, such as gunmetal (BC6), iron, ductile cast iron (FCD), are used for the metal pipe | tube main bodies 11a in these modifications, for example.

Finally, the possibilities of yet another embodiment of the present invention are listed. In addition, the same code | symbol is attached | subjected to the member similar to said 1st embodiment.
In the first embodiment, the annular recess 42 of the union nut 4 is used as the fitting portion of the latching portion 22, and the flange 43 of the union nut 4 is used as the latched portion of the latching portion 22. In the second embodiment shown in FIGS. 18 and 19, the pair of latching portions 22 </ b> A and 22 </ b> A of the latching member 20 </ b> A are latched to the second opening 45 of the union nut 4. In the present embodiment, the joint body 3 serves as a fitting portion of the latching portion 22, and the second opening 45 serves as a latched portion of the union nut 4 that latches the latching portion 22 </ b> A.

  As shown in FIGS. 18 and 19, in the second embodiment, the inner diameter r <b> 1 of the latching portion 22 </ b> A is smaller than the maximum outer diameter R <b> 3 of the union nut 4. Thereby, since the latching | locking part 22A contact | abuts to the 2nd opening part 45, detachment | leave of a pipe | tube is prevented. Moreover, the inner diameter r <b> 2 of the recess 23 </ b> A is larger than the maximum outer diameter R <b> 3 of the union nut 4. Thereby, the opposing union nuts 4 and 4 are accommodated in the recess 23A, and the pipe joints can be arranged close to each other as in the first embodiment.

  Further, as shown in FIG. 18B, the opening width D1A of the latching portion 22A between the other ends 21z, 21z of the pair of arcuate members 21A, 21A fastened and fixed is the outer diameter R4 of the joint body 3. Smaller than. Further, the opening width D2A of the recess 23A is smaller than the maximum outer diameter R3 of the union nut 4. In the present embodiment shown in the figure, all the dimensional conditions are satisfied, but it is sufficient that at least one of the dimensional conditions is satisfied. Under any condition, the pair of arcuate members 21A and 21A that are fastened and fixed do not fall off the joint body 3 and the union nut 4, and the connection between the union nut joints 2 and 2 is not released. . Moreover, as shown in FIG. 19, since space C1, C2 is provided between the latching | locking part 22A and the coupling main body 3, and between the recessed part 23A and the union nut 4, it can be made flexible also in this embodiment. . In addition, since the gap t0 is formed between the latching portion 22A and the second opening 45, the expansion and contraction of the tube is allowed by that distance, and the detachment of the tube is prevented by contacting these. In addition, in the example of the figure, although the annular recess 42 and the flange 43 are provided in the union nut 4, it is applicable also to a union nut which does not have these.

  Further, in the third embodiment shown in FIGS. 20 and 21, one latching portion 22Ba of the arcuate member 21B of the latching member 20B is latched to the annular recess 42 of the union nut 4 and the other latching portion 22Bb is latched. The union nut 4 is hooked on the second opening 45. That is, this embodiment is a mode in which the first and second embodiments are combined, and can exhibit the same effects as described above. In addition, in the example of the figure, although the annular recess 42 and the flange 43 are provided in the union nut 4, it is applicable also to a union nut which does not have these.

  Moreover, in each said embodiment, a pair of latching | locking parts 22 and 22 were formed over the full length of the circular-arc-shaped member 21. FIG. However, as shown in FIG. 22, a protrusion 27 that protrudes inward may be provided on the latch portion 22. In such a case, for example, the inner diameter r3 of the protrusion 27 is made smaller than the outer diameter R1 of the annular recess 42 as the fitting portion into which the latching portion 22 is fitted. As shown in FIG. 5B, when tightening is performed by the tightening means 29, the outer end portions 24b of the mounting portion 24 are in contact with each other, and the projection 27 is in contact with the annular recess 42, while the mounting portion 24 is A gap 28 is formed without contact between the inner end portions 24c. Since the protrusion 27 comes into contact with the annular recess 42, the latching member 20 is temporarily fixed to the union nut 4. Since only the projection 27 is in contact, the expansion and contraction flexibility with a relatively small force can be suppressed. When the inner ends 24c are further brought into contact with each other by being further tightened, the projection 27 presses the annular recess 42 with a constant pressing force, as shown in FIG. Temporarily fixed. Therefore, expansion / contraction flexibility can be further suppressed. Note that the protrusion 27 may be provided in the recess 23 instead of the hook 22, or may be provided in the recess 23 in addition to the hook 22. In such a case, the inner diameter r3 of the protrusion 27 provided in the recess 23 is made smaller than the outer diameter R2 of the flange 43 of the union nut 4. Also by this, the latching member 20 can be temporarily fixed to the union nut 4, and expansion / contraction flexibility can be suppressed.

Further, in each of the above embodiments, an elastic member is provided between the abutting portion 12 of the joining tube 10 and the recess 23 of the latching member 20, and for example, vibration absorption and expansion / contraction flexibility in an exposed pipe where no water pressure is applied is possible. It is also possible to make it.
For example, as shown in FIG. 23, the contact portion 12 of the joining tube 10 may be constituted by an elastic member 12 e supported by the support member 17. As shown in FIG. 24, the elastic member 12 e is larger than the flange 43 and the tip is located in the recess 23. Thereby, since the elastic member 12e contacts the recessed part 23, a vibration can be prevented. In addition, the elastic member 12e can impart expansion / contraction flexibility to the connecting portion of the joint.

  Also, as shown in FIGS. 25 and 26, by providing a molded rubber plate or the like as the elastic member 26 in the recess 23 of the latching member 20, vibrations can be similarly suppressed and rotation of the joint can be prevented. Further, as shown in FIG. 27, the contact portion 12 of the joining tube 10 may be constituted by an elastic member 12 f formed to have an outer diameter larger than the inner diameter of the recess 23. As a result, as shown in FIG. 28, the elastic member 12f is compressed and deformed by the recess 23, so that vibration and rotation are suppressed by the compressive deformation, and the elastic member 12f can be expanded and contracted. These embodiments can be implemented in combination with the above embodiments.

  INDUSTRIAL APPLICABILITY The present invention can be used as a connection device and a connection method for connecting and fixing union nut pipe joints close to each other.

1: connection device, 2: union nut joint, 3: joint body, 4: union nut, 10: joined pipe, 11, 11a: pipe body, 12: contact portion, 12a, 12b, 12e, 12f: elastic member ( Contact portion), 12c: convex portion (contact portion), 12d: deformation portion (contact portion), 13: groove, 14: rib, 15: coating layer, 16: C-shaped bracket (contact portion), 17 : Support member, 20: latching member, 21, 21A: arc-shaped member, 21z: other end, 22, 22A, 22Ba, 22Bb: latching portion, 23, 23A, 23B: recessed portion, 24: mounting portion, 24a: Through hole, 24b: outer end, 24c: inner end, 25: recess, 26: rubber plate (elastic member), 27: protrusion, 28: gap, 29: tightening means, 29a: bolt, 29b: nut , 30 :, 31: outer peripheral surface, 32: male screw, 33: receiving part, 4 : Opening, 41: outer peripheral surface, 42: annular recess (inserted portion), 43: flange (hooked portion), 44 :, 45: second opening (locked portion), 100: pipe detachment preventing device , 101: Retaining ring, 102: Locking bracket, A: Distance between joints, C1, C2: Space, D1, D1A: Latch opening width, D2, D2A: Recess opening width, D3: Non-tightening hook Stop opening width, D4: recess opening width when not tightened, R1: annular recess (insertion portion) outer diameter, R2: flange (hooked portion) outer diameter, R3: union nut maximum outer diameter, R4: joint Body outer diameter, r1, r1a, r1b: latching portion inner diameter, r2: recess inner diameter, r3: protrusion inner diameter, S: expansion / contraction amount, T: width of recess, t0: gap, t1: contact portion thickness, t2: Flange thickness, W: Snap ring width, θ: Opening angle

Claims (15)

A connection device for a union nut joint for connecting a joint main body having a receiving portion engraved with an external thread on an outer peripheral surface and a union nut joint including a union nut screwed and tightened to the receiving portion close to each other,
A joining pipe inserted into the opposite receiving part;
It has a latching member having a pair of latching parts that latch on the opposing union nuts,
The joining pipe has a contact portion that contacts each opening of the opposing union nut,
The hooking member comprises a pair of arcuate members that are fastened and fixed by fastening means at one end,
The opening angle between the other ends of the pair of arcuate members fixed by fastening is less than 180 °,
The pair of latching portions are provided facing each other along the longitudinal direction of the arcuate member and form a recess therebetween.
The recess is a connection device for a union nut joint that covers at least a part of the opposing union nut. The opening width of the pair of latching portions between the other ends of the pair of arcuate members fixed by fastening is smaller than the outer diameter of the fitting portion of the union nut into which the latching portions are fitted. The connecting device for a union nut joint according to claim 1. The opening width of the concave portion between the other ends of the pair of arcuate members fastened and fixed is smaller than the outer diameter of the hooked portion of the union nut on which the hooking portion is hooked. The connection apparatus of the union nut coupling of 1 or 2. The arcuate member has a through hole through which the fastening means penetrates at the one end, and the through hole is located between the other end of the pair of arcuate members in a state in which the fastening means is loosened. Between the other ends of the pair of arcuate members when the opening width of the latching portion is larger than the outer diameter of the fitting portion of the union nut into which the latching portion is fitted and the tightening means is loosened The opening width of the said recessed part is formed in the taper shape so that it may become larger than the outer diameter of the to-be-latched part of the said union nut which latches the said latching part. Union nut joint connection device. The inner diameter of the pair of hooking portions is larger than the outer diameter of the fitting portion of the union nut that fits the hooking portion, and smaller than the outer diameter of the hooked portion of the union nut that hooks the hooking portion. The connecting device for a union nut joint according to any one of claims 1 to 4, wherein an inner diameter of the recess is larger than an outer diameter of a hooked portion of the union nut that holds the hooking portion. The connection apparatus of the union nut coupling in any one of Claims 1-4 which has a projection part which contacts the fitting part of the said union nut which inserts the said latching part in at least one part of a pair of said latching part. The said opposing union nut has the flange provided in the said opening part, and the annular recessed part adjacent to this flange, The said latching part is inserted in the said annular recessed part, and latches to the said flange. A connection device for a union nut joint according to claim 1. At least one of the opposing union nuts has a flange provided in the opening and an annular recess adjacent to the flange, and one of the pair of latching portions is fitted into the annular recess of one union nut, and The connection device of a union nut joint according to any one of claims 1 to 6, wherein the union member is hooked on the flange, and the other hooking portion is hooked on the second opening of the other union nut. The connection device for a union nut joint according to any one of claims 1 to 4, wherein the pair of hooking portions are hooked to a second opening of the opposing union nut. The union joint connecting device according to any one of claims 1 to 9, wherein the recess is provided with an elastic member. The connection device for a union nut joint according to any one of claims 1 to 10, wherein the contact portion is a separate body from the tube main body of the joining tube. The connection device for a union nut joint according to any one of claims 1 to 10, wherein the contact portion is formed integrally with a pipe body of the joining pipe. The connection device for a union nut joint according to claim 11 or 12, wherein the contact portion further includes an elastic member. The connection device for a union nut joint according to claim 11, wherein the contact portion is made of an elastic member. A connection method for a union nut joint using the union nut joint connection device according to any one of claims 1 to 14,
Insert the joint tube into the opposite receiving part,
Abutting the abutting portion of the joining pipe to each opening of the opposing union nut;
Each of the pair of hooks is hooked to the opposing union nuts,
A method for connecting union nut joints, wherein the pair of arcuate members are fastened and fixed by the fastening means.

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