JP5456092B2 - Pipe detachment prevention device for union nut joint - Google Patents

Description

  The present invention relates to an expansion / contraction flexible pipe joint in which a pipe end portion of a joint pipe not engraved with a screw is inserted into a receiving portion of a pipe or a joint main body, and is fastened with a union nut through a rubber packing. The present invention relates to a provided pipe detachment prevention device.

As shown in FIG. 12, the pipe detachment preventing device 1 provided in the expansion / contraction flexible pipe joint 6 described in Patent Document 1 is a receptacle in which a male screw 2a (see FIG. (D)) is formed on the outer peripheral surface on the front end side. A flexible tube having a structure in which a screwless joining tube 3 is inserted into a tube or joint body 2 having a portion 2b, an annular rubber packing 4 is inserted and interposed, and a union nut 5 is screwed and tightened to a receiving portion 2b. A stop ring 9 formed by splitting pieces 9 </ b> A and 9 </ b> B provided on the pipe joint 6 and externally fitted to the joint pipe 3 in front of the union nut 5 and tightened by the bolt 7 and the nut 8, and the union nut 5 A joint fitting portion 10 that is arranged loosely on the pipe or the outer peripheral surface of the joint body 2 and can be locked to the union nut 5, and an arm 11 that connects the retaining ring 9 and the joint fitting portion 10. And. The joint fitting portion 10 is divided into two divided pieces 10A and 10B that are tightened by bolts 7 and nuts 8. The arm 11 is extended forward from each divided piece 10A (10B) and the arms 11 of A hook portion 12 is integrally provided at the tip, and a horseshoe-shaped flange portion 10 c formed inside is externally fitted on the outer peripheral surface of the pipe or joint body 2. The retaining ring 9 is configured such that a locking ear 14 protrudes from the outer peripheral surface of each divided piece 9A (9B), and the hook 12 is engaged with the locking ear 14. The pipe detachment preventing device 1 uses the pulling force applied to the joint pipe 3 to obtain the locking ear portions 14 and 14 of the retaining ring 9, the hook portions 12 and 12 of the joint fitting portion 10, the arms 11 and 11, and the joint fitting. By transmitting to the union nut 5 through the part 10 and canceling out the reaction force generated in the union nut 5, the joining pipe 3 is prevented from being separated from the expansion / contraction flexible pipe joint 6.

  Moreover, although the pipe detachment preventing device according to another aspect described in Patent Document 1 is not illustrated, the flange portion 10c of the joint fitting portion 10 formed in a horseshoe shape in an annular concave portion provided in the front end side of the union nut. Is externally fitted in a loose state.

JP-A-2005-240910

The conventional pipe detachment preventing device 1 is an independent one comprising a joint fitting portion 10 integrally provided with an arm 11 having a hook portion 12 at the tip, and a retaining ring 9 having a locking ear portion 14 protruding from an outer peripheral surface. Since the two members 10 and 9 are provided, there is a problem that the two members 10 and 9 are troublesome when being inserted into the telescopic flexible pipe joint 6, are difficult to handle, and increase the manufacturing cost. It was.

  Furthermore, as shown in FIG. 12, the conventional pipe detachment preventing device 1 covers the outer peripheral rear end side of the union nut 5 so that the exposed dimension in the front-rear direction of the union nut 5 is shortened. As a tool for tightening the union nut, there is a drawback that a special specification tool that can cope with this short exposed dimension has to be prepared.

  An object of the present invention is to provide a pipe detachment prevention device that can solve the above-described problems.

The means employed by the present invention as claimed in claim 1 in order to be able to be easily mounted on an expansion / contraction flexible pipe joint, to reduce the manufacturing cost, and to eliminate the need for a special tightening tool is shown in FIGS. 7, a non-threaded joining pipe 3 is inserted into a pipe or joint body 2 having a receiving portion 2 b in which a male thread 2 a is engraved on the outer peripheral surface on the front end side, and an annular rubber packing 4 is inserted and interposed. The union nut 5 is provided in the expansion / contraction flexible pipe joint 6 having a structure in which the union nut 5 is screwed and tightened to the receiving portion 2b. The union nut 5 is externally attached to the joining pipe 3 before the union nut 5 and tightened by the bolt 7 and the nut 8. A retaining ring 29 composed of the two divided pieces 29A and 29B, and a hook that is arranged loosely on the pipe or the outer peripheral surface of the joint body 2 behind the union nut 5 and can be locked to the union nut 5 Part 30, retaining ring 29 and hook part A pipe detachment preventing device 21 having an arm 31 for connecting 0, wherein the retaining ring 29 has a flange portion provided with an insertion hole 29c for the bolt 7 outward from both end portions of each divided piece 29A (29B). 29d, 29d projectingly, the arm 31 is extended backward only from each flange portion 29d, and one hook portion 30 is individually integrally provided at the rear end of each arm 31 to provide an arm with a hook portion. The outer peripheral surface of the union nut 5 and the outer peripheral surface of the pipe or joint body 2 protrude from between the opposing arms 31 and 31 with hook portions in each of the divided pieces 29A (29B) when tightened. This is a pipe detachment preventing device 21 for a union nut joint.

The means employed by the present invention according to claim 2 to allow the joint tube to be loosely fitted so that the snap ring can be temporarily assembled to the expansion / contraction flexible pipe joint is shown in FIG. The union is arranged on the inner side surrounded by the four arms 31 by connecting the flange portions 29d and 29d of the split pieces 29A (29B) on both sides with bolts 7 and nuts 8 so that the joining pipe 3 can be loosely fitted. By screwing the nut 5 into the receiving portion 2b, the four hook portions 30 are placed in a loosely assembled state on the outer peripheral surface of the pipe or the joint body 2 , and each of the split portions is in a temporarily assembled state. The closest distance W1 between the inner peripheral surfaces of the opposing hook portions 30 and 30 in the piece 29A (29B) is smaller than the outer diameter D1 of the outer peripheral surface of the region facing the hook portions 30 in the pipe or joint body 2 and Of the inner peripheral surface of the part 30, 30 So that the distance W2 is greater than the outer diameter D1, and the distance W3 between the opposing hook portions 30 and 30 in both divided pieces 29A and 29B is very smaller than the outer diameter D1. is set, when moving along a radial direction of the union nut 5, it is brought into contact with the hook portion 30 on the outer peripheral surface of the tube or the joint body 2, so as not to separate from the tube or the joint body 2 In the temporarily assembled state, when the retaining ring 29 is moved forward along the axial direction of the union nut 5, the hook portion 30 is brought into contact with the rear end surface 5 a of the union nut 5 to expand and contract the flexible flexible pipe joint. The union nut joint disengagement prevention device 21 according to claim 1, wherein the retaining ring 29 is not separated from the union nut joint 6.

The present invention according to claim 3 is provided so that the snap ring can be temporarily assembled to the union nut so that it can be easily attached to the expansion / contraction flexible pipe joint, the manufacturing cost is reduced, and the joining pipe can be loosely fitted. As shown in FIG. 9 and FIG. 10 , the adopted means is to insert a screwless joining pipe 3 into a pipe or joint body 2 having a receiving portion 2b in which a male screw 2a is engraved on the outer peripheral surface on the front end side, The rubber packing 4 is inserted and inserted into the expansion / contraction flexible pipe joint 46 having a structure in which the union nut 45 is screwed and fastened to the receiving portion 2b, and is externally attached to the joining pipe 3 on the front side of the union nut 45. The ring-shaped recesses 49 are arranged in a loose state on a retaining ring 49 made up of two divided pieces 49A and 49B that are tightened by bolts 7 and nuts 8 and an annular recess 45b that is recessed on the front end side of the union nut 45. 45b on the side A pipe detachment preventing device 41 including a hook portion 50 that can be engaged, and a retaining ring 49 and an arm 51 that connects the hook portion 50, and the retaining ring 49 is located outward from both end portions of each divided piece 49A (49B). A flange portion 49d provided with an insertion hole 49c for the bolt 7 is projected, and the arm 51 is extended rearward from only the flange portion 49d, and one hook portion 50 is provided at the rear end of each arm 51. the provided four arms with hook integrally provided separately, as shown in FIG. 11, the retaining ring 49, the flange portion 49d of both sides of the divided pieces 49A to the joint tube 3 can loosely coupling (49B) 49d are connected to each other by bolts 7 and nuts 8 and the four hook portions 50 are arranged in the annular recess 45b to provide a temporarily assembled state. In the temporarily assembled state, the divided pieces 49A (49B) face each other. The closest distance W1 between the inner peripheral surfaces of the hook portions 50, 50 is smaller than the outer diameter D4 of the circular bottom surface of the annular recess 45b of the union nut 45, and the most distant interval W2 between the inner peripheral surfaces of the hook portions 50, 50 is the same. The outer diameter D4 is larger than the outer diameter D4, and the distance W3 between the opposing hook portions 50, 50 in both the divided pieces 49A, 49B is very small compared to the outer diameter D4 of the circular bottom surface of the annular recess 45b. The hook portion 50 is brought into contact with the bottom surface of the annular recess 45b so as not to be separated from the union nut 45 when moved along the radial direction of the union nut 45. When the retaining ring 49 is moved forward along the axial direction of the union nut 45, the hook portion 50 is brought into contact with the front annular side wall surface 45c of the union nut 45. The union nut joint pipe detachment preventing device 41 is characterized in that it is not separated from the union nut 45 .

The union nut joint pipe detachment preventing device according to the first aspect of the present invention can prevent the joint pipe from being detached by using a single retaining ring. Further, since the dimension in the front-rear direction of the outer peripheral surface portion on which the union nut tightening tool is hooked is not shortened, a general-purpose tightening tool can be used.

Claim 2 for the union nut joint pipe separation preventing device according to the present invention described, by using the one of the snap ring that can be temporarily assembled state which does not separate from the expansion flexible tube joint, the telescopic flexible pipe joint in the construction site Assembly can be simplified.

  Since the pipe | tube removal prevention apparatus for union nut joints which concerns on this invention of Claim 3 can prevent detachment | leave of a joining pipe by using one stop ring which can be made not to isolate | separate from a union nut, it is to an expansion-contraction flexible pipe joint. It can be easily mounted and the manufacturing cost can be reduced.

According to a third aspect of the present invention, there is provided a device for preventing union of pipes for union nut joints by using a single retaining ring that can be put into a temporarily assembled state that is not separated from the union nuts, thereby simplifying the assembly of the expansion / contraction flexible pipe joints at the construction site. Can be.

1 shows a union nut joint pipe disengagement prevention device (hereinafter referred to as “the present invention tube disengagement prevention device”) 21 according to the present invention of the first embodiment, and can be expanded and contracted with a retaining ring 29 before temporary assembly. It is a perspective view which shows the state which isolate | separated the flexible pipe joint. It is a perspective view which shows the assembled state in 1st Embodiment. FIG. 1 shows one (lower) split piece 29A of a retaining ring 29 in the first embodiment, where FIG. (A) is a front view, FIG. (B) is a rear view, and FIG. (C) is a plan view; FIG. (D) is a bottom view. FIG. 2A is a plan view and FIG. 1B is a right side view of the temporary assembly in the first embodiment. FIG. 1A is a right side view, FIG. 2B is a rear view taken along line C5B-C5B in FIG. 1A, and FIG. It is a rear view showing a state where the retaining ring 29 is not separated even if the retaining ring 29 is moved downward. The assembled state in a 1st embodiment is shown, and Drawing (A) is a top view and Drawing (B) is a top view which carried out a section. The assembled state in 1st Embodiment is shown, Comprising: FIG. (A) is a right view, FIG. (B) is the rear view cut | disconnected by the C7B-C7B line | wire of FIG. FIG. 2 shows an assembled state in which the positions of the arms 31 are different in the first embodiment, where FIG. (A) is a right side view and FIG. (B) is a front view. The assembled state of the present invention pipe detachment preventing device 41 according to the second embodiment is shown, in which FIG. (A) is a plan view and FIG. (B) is a cross-sectional plan view. The assembled state in 2nd Embodiment is shown, Comprising: FIG. (A) is a right view, FIG. (B) is the rear view cut | disconnected by the C9B-C9B line | wire of FIG. FIG. 4A shows a middle of the temporary assembly in the second embodiment, where FIG. (A) is a right side view, and FIG. (B) is a rear view taken along line C10B-C10B in FIG. FIG. 1 shows a conventional union nut joint pipe detachment preventing device 1, in which FIG. (A) is a perspective view showing the assembled state, FIG. (B) is a perspective view of a joint fitting portion 10, and FIG. C) is a perspective view of the retaining ring 9, and FIG. (D) is a plan view showing a cross section of the assembled main part.

(First embodiment)
The present invention pipe detachment preventing device 21 according to the first embodiment shown in FIGS. 2, 6 and 7 is provided in the expansion / contraction flexible pipe joint 6 and prevents the joining pipe 3 from detaching with a single retaining ring 29. To do. The expansion / contraction flexible pipe joint 6 is joined to a pipe or joint body 2 having a receiving portion 2b in which an external thread 2a (see FIG. 6B) is engraved on the outer peripheral surface on the front end side, as in the prior art. The pipe 3 is inserted, an annular rubber packing 4 is inserted, and the union nut 5 is screwed and fastened to the receiving portion 2b.

  The retaining ring 29 is divided into two divided pieces 29A and 29B shown in FIG. 1 and FIG. 3, and a flange portion is formed outward from each of both end portions of the substantially semicircular curved portion 29e of each divided piece 29A (29B). 29d projectingly, the arm 31 is extended from each flange portion 29d rearward, and a hook portion 30 projecting inwardly at the rear end of each arm 31 is integrally formed. The flange portion 29d is provided so as to project along the radial direction of the joining pipe 3, and an insertion hole 29c for the bolt 7 is formed therein. As shown in FIG. 7A, the retaining ring 29 has an opposing flange portion 29d in an assembled state in which the mating surfaces 30a and 30a of the opposing hook portions 30 and 30 of the split pieces 29A and 29B are in contact with each other. , 29d, the mating surface 30a of the hook portion 30 in one of the split pieces 29A (or 29B) is more than the mating surface 29d ′ of the flange portion 29d so that a gap E is formed between the mating surfaces 29d ′, 29d ′. Is also provided to project toward the other divided piece 29B (or 29A). The retaining ring 29 is formed by forming a gap E between the flange portions 29d and 29d in a state in which the hook portions 30 and 30 are in contact with each other at the time of assembling the joint tube 3 to be externally fitted. Even if the size of the gap E is reduced by tightening the nut 7 and the nut 8, there is no change in position between the hook portions 30, 30 that are in contact with each other, and a flexible loose engagement state with respect to the pipe or the joint body 2 is maintained. be able to. Each divided piece 29A (29B) is formed by integrally forming the curved portion 29e, the flange portions 29d and 29d, the arms 31 and 31 and the hook portions 30 and 30 shown in FIGS. 1 and 3 by casting, or by integrally forming the flange portion 29d. The two sets of the arm 31 and the hook portion 30 are integrated by welding to both end portions of the bending portion 29e. The split pieces 29A and 29B of the retaining ring 29 are provided with serrations 29f for preventing slippage on the inner peripheral surface thereof. The lower divided piece 29B is assembled by providing protrusions 29g and 29g (see FIG. 7A) for preventing idling to sandwich the head of the bolt 7 on the flange 29d so that only the nut 8 can be rotated with a wrench. We are trying to improve workability at the time.

  As for the respective arms 31 of the split pieces 29A and 29B of the retaining ring 29, as shown in FIG. 7 (A), a case where the intermediate height position portion in the hook portion 30 is joined, and FIGS. 8 (A) and (B). As shown in FIG. 2, there is a case where a portion of the hook portion 30 away from the mating surface 30a is joined and a case where a portion approaching the mating surface 30a of the hook portion 30 is joined. The space | interval 31 can be changed according to the kind of union nut fastening tool corresponding to the aperture of a union nut.

As shown in FIG. 4, the retaining ring 29 is formed by connecting the flange portions 29d and 29d, which form a pair of split pieces 29A (29B) on both sides, with bolts 7 and nuts 8 so that the joining pipe 3 can be loosely fitted. As shown in FIG. 5, the union nut 5 disposed on the inner side surrounded by the four arms 31 is screwed into the receiving portion 2 b, so that each hook portion 30 is allowed to play on the outer peripheral surface of the pipe or the joint body 2. When the union nut 5 is moved in the radial direction (up / down / left / right direction), the hook portion 30 is brought into contact with the outer peripheral surface of the pipe or the joint main body 2 to form the pipe. Alternatively, it is not separated from the joint body 2.

As shown in FIGS. 6 and 7, the retaining ring 29 is formed by bolting flange portions 29d and 29d facing each other of the split pieces 29A and 29B of the retaining ring 29 that are externally fitted to the joining pipe 3 on the front side of the union nut 5. 7 and the nut 8, the retaining ring 29 is crimped to the joining pipe 3, and when the assembled hooks 30, 30 of the split pieces 29 </ b> A, 29 </ b> B are brought into contact with or close to each other, The inner diameter D2 of the curved inner peripheral surface of the hook portions 30, 30... Shown in (B), the outer diameter D1 of the outer peripheral surface of the pipe or joint body 2, and the outer diameter D3 of the circular rear end surface 5a of the union nut 5 are as follows. The following dimensional relations are set.
(D3- (D3-D1) ÷ 2)>D2> D1
As a result, the pipe detachment preventing device 21 according to the present invention causes the pulling force applied to the joining pipe 3 to be applied to the flange portions 29d, the arms 31 and the hook portions 30 of the split pieces 29A and 29B of the retaining ring 29 in the assembled state. The joint pipe 3 is separated from the expansion / contraction flexible pipe joint 6 (see FIG. 6 (B)) by transmitting to the circular rear end face 5a of the union nut 5 through the counter and canceling the reaction force generated in the union nut 5. I'm trying not to let you. As shown in FIG. 7A, the retaining ring 29 forms a gap E between the opposing flange portions 29d and 29d even when the hook portions 30 and 30 are brought into contact with each other. Thus, the large outer diameter tolerance of the joining pipe 3 can be dealt with, and the bolt 7 and the nut 8 can be tightened.

Further, as shown in FIG. 5, the retaining ring 29 is in a temporarily assembled state in which the joining tube 3 can be loosely fitted and is not separated from the expansion / contraction flexible pipe joint 6, and in each divided piece 29A (29B). The closest distance W1 between the inner peripheral surfaces of the hook portions 30, 30 facing each other is smaller than the outer diameter D1 of the outer peripheral surface of the region facing the hook portions 30 in the pipe or joint body 2, and the inner portions of the hook portions 30, 30 The distance W2 that is farthest from the circumferential surface is larger than the outer diameter D1, and the distance W3 between the opposing hook portions 30 and 30 in both divided pieces 29A and 29B is much smaller than the outer diameter D1. It is set to be. As a result, the pipe detachment preventing device 21 of the present invention has a hook portion as shown in FIG. 5 (C) when the retaining ring 29 is moved along the radial direction (up / down / left / right direction) of the union nut 5 in the temporarily assembled state. 30 is brought into contact with the outer peripheral surface of the pipe or joint body 2 so as not to be separated from the elastic flexible pipe joint 6, and the expansion flexible pipe joint 6 and the joint pipe 3 are joined using a pipe detachment preventing device ( Assembling work) can be done easily. Furthermore, when the pipe detachment preventing device 21 of the present invention is in the temporarily assembled state shown in FIG. 5, the closest distance W1 between the inner peripheral surfaces of the opposing hook portions 30 and 30 in the split piece 29A (29B) of the retaining ring 29 is set. When the retaining ring 29 is moved forward along the axial direction of the union nut 5 so as to have a dimensional relationship smaller than the outer diameter D1 of the outer peripheral surface of the pipe or joint body 2, the hook portion 30 is moved to the union nut 5 The retaining ring 29 is prevented from being separated from the telescopic flexible pipe joint 6 by being brought into contact with the rear end surface 5a so that the assembly at the site can be simplified.

  The present invention pipe detachment preventing device 21 configured as described above is cast-molded at a factory, temporarily assembled as necessary, and shipped in this state. First, as shown in FIG. 4, the temporary assembly is a bolt 7 in which flange portions 29d and 29d of the split pieces 29A (29B) on both sides are temporarily tightened so that the joining tube 3 can be loosely fitted inside the retaining ring 29. And the nut 8, and then the union nut 5 in which the rubber packing 4 (see FIG. 6 (B)) is inserted is moved through the space between the arms 31 and 31 of the split piece 29A (or 29B). The hooks 30 are inserted into the inner side surrounded by the arms 31 and then screwed into the receiving part 2b as shown in FIG. The temporarily assembled state is arranged on the outer peripheral surface in a loose state.

  Next, at the construction site, the joining pipe 3 is inserted into the present invention pipe detachment preventing device 21 in the temporarily assembled state. Since the center axis of the snap ring 29, the union nut 5, the packing 16, and the pipe or joint body 2 can be made to coincide with each other in the temporarily assembled state shown in FIG. The insertion port only has to be inserted from the retaining ring 29 side into the union nut 5 and the packing 16 to reach the inside of the pipe or the joint main body 2, which is extremely easy. After that, the union nut 5 is manually rotated to temporarily fix the joining pipe 3, and then tightened to a minimum tightening torque necessary for watertightness with a tool such as a spanner or a pipe wrench. Since there is no union nut 5 that covers between the arms 31, 31 facing each other via the union nut 5, a tightening operation with a tool is easily performed. After confirming that the retightening of the union nut 5 has been completed, turn this so that the fastening portion of the retaining ring 29 by the bolt 7 and the nut 8 can be easily tightened (for example, the position where the nut 8 is upward). Move. Finally, the retaining ring 29 is fastened. Fastening of the retaining ring 29 is performed by determining the axial positioning with respect to the joining pipe 3 and the direction of the bolt fastening portion, and then finally fastening the bolt 7 and the nut 8 and engraving the inner peripheral surface of the retaining ring 29. What is necessary is just to perform so that the saw-tooth 29f may bite into the outer peripheral surface of the joining pipe 3, and the anti-slip | skid function may be exhibited.

  Thereby, the joining pipe | tube 3 can be elastically expanded-contracted within the range which the hook part 30 of the retaining ring 29 can move on the outer peripheral surface of a pipe | tube or the coupling main body 2. FIG. The pipe detachment preventing device 21 of the present invention has an inner diameter D2 of the curved inner peripheral surface of the hook portions 30, 30... Of the snap ring 29 tightened as shown in FIG. Is larger than the outer diameter D1 of the outer peripheral surface of the pipe or joint body 2 and the thickness T of the hook part 30 is set to the union nut 5 and the fastening tool hooking part 2c of the pipe or joint body 2 as shown in FIG. It is set to have a dimensional relationship smaller than the gap G between them.

  The pipe detachment preventing device 21 of the present invention allows the joining pipe 3 to be inserted and removed while maintaining the state in which the retaining ring 29 is connected to the telescopic flexible pipe joint 6 by tightening or loosening the bolt 7 and the nut 8 of the retaining ring 29. Since it is possible, it can be used repeatedly.

  The pipe detachment preventing device 21 of the present invention can prevent the joining pipe 3 from detaching by using a single retaining ring 29. Therefore, the pipe detachment preventing apparatus 21 can be easily attached to the telescopic flexible pipe joint 6 and can be manufactured at low cost. Furthermore, the pipe detachment preventing device 21 of the present invention uses a single retaining ring 29 that can be in a temporarily assembled state that is not separated from the pipe or the joint body 2, thereby assembling the telescopic flexible pipe joint with the tube detachment preventing device at the construction site. Can be simple.

(Second Embodiment)
The present invention pipe detachment preventing device 41 according to the second embodiment shown in FIGS. 9 to 11 is provided on the expansion / contraction flexible pipe joint 46 and prevents the joining pipe 3 from being detached by a single retaining ring 49. There is a significant difference from the pipe detachment preventing device 21 of the present invention according to the first embodiment, in which the hook portion 50 of the retaining ring 49 is loosely engaged with the annular recess 45b formed in the front end side of the union nut 45. It is that it was charged and arranged.

As in the prior art, the expansion / contraction flexible pipe joint 46 is formed of a pipe having a receiving portion 2b in which a male thread 2a is formed on the outer peripheral surface on the front end side as shown in FIG. 3 is inserted, an annular rubber packing 4 is inserted and inserted, and a union nut 45 is screwed and tightened to the receiving portion 2b.

  As shown in FIGS. 10 and 11, the retaining ring 49 is divided into two divided pieces 49A and 49B, and outward from both end portions of the substantially semicircular curved portion 49e of each divided piece 49A (49B). A flange portion 49d is protruded, and an arm 51 is extended rearward from each flange portion 49d, and a hook portion 50 is provided integrally at the rear end of each arm 41. The flange portion 49d is provided so as to project along the radial direction of the joining pipe 3, and an insertion hole 49c for the bolt 7 is formed therein. As shown in FIG. 10 (A), the retaining ring 49 is formed by the flanges 49d and 49d facing each other when the mating surfaces 50a and 50a of the facing hooks 50 and 50 of the split pieces 49A and 49B are brought into contact with each other. In order that a gap E is formed between the mating surfaces, the mating surface 50a of the hook portion 50 in one split piece 49A (or 49B) is set to the other split piece 49B (or 49A) than the mating surface of the flange portion 49d. It protrudes toward. In each divided piece 49A (49B), the bent portion 49e, the flange portions 49d and 49d, the arms 51 and 51 and the hook portions 50 and 50 are integrally formed by casting, or the flange portion 49d, the arm 51 and the hook portion 50 are integrally formed. These two sets are welded to both end portions of the curved portion 49e to be integrated. As in the first embodiment, the split pieces 49A and 49B of the retaining ring 49 are provided with a non-slip saw tooth (see reference numeral “29f” in FIG. 1) on the inner peripheral surface thereof. The lower split piece 49B is provided with protrusions 49g and 49g (see FIG. 10 (A)) for preventing idling that sandwich the head of the bolt 7 on the flange portion 49d so that only the nut 8 can be rotated with a wrench. We are trying to improve workability at the time.

As shown in FIG. 11, the retaining ring 49 is formed by connecting flange portions 49d and 49d, which are a pair of split pieces 49A (49B) on both sides, with bolts 7 and nuts 8 so that the joining pipe 3 can be loosely fitted. When the hook portion 50 is disposed in the annular recess 45b, a temporarily assembled state is obtained. When the hook portion 50 is moved along the radial direction of the union nut 45, the hook portion 50 is brought into contact with the bottom surface of the annular recess 45b. It is designed not to be separated from.

As shown in FIGS. 9 and 10, the retaining ring 49 is formed of a retaining ring 49 that is externally fitted to the joint pipe 3 on the front side of the union nut 45 that is screwed and tightened to the receiving portion 2 b of the flexible flexible joint 46 . The flanges 49d and 49d facing each other of the split pieces 49A and 49B are fastened with bolts 7 and nuts 8 so that the hook portions 50 and 50 facing each other of the split pieces 49A and 49B approach or come into contact with each other. When the assembled state is formed by pressing 49 to the joining pipe 3, the inner diameter D2 of the curved inner peripheral surface of the hook portions 50, 50... And the front of the annular recess 45b of the union nut 45 as shown in FIG. The outer diameter D5 of the annular side wall surface 45c and the outer diameter D4 of the circular bottom surface of the annular recess 45b are set to have the following dimensional relationship.
(D5- (D5-D4) ÷ 2)>D2> D4
As a result, the pipe detachment preventing device 41 of the present invention applies the pulling force applied to the joining pipe 3 in the assembled state to the flange portions 49d, the arms 51 and the hook portions 50 of the divided pieces 49A and 49B of the retaining ring 49. The joint tube 3 is prevented from being separated from the expansion / contraction flexible pipe joint 46 by being transmitted to the front annular side wall surface 45c of the annular groove 45b of the union nut 45 through the counter-force to cancel the reaction force generated in the union nut 45. It is.

Further, as shown in FIG. 11, the retaining ring 49 is in a temporarily assembled state in which the joining tube 3 can be loosely fitted and is not separated from the union nut 45, and the hooks facing each other in the divided pieces 49A (49B). The closest distance W1 between the inner peripheral surfaces of the portions 50, 50 is smaller than the outer diameter D4 of the circular bottom surface of the annular recess 45b of the union nut 45, and the distance W2 between the inner peripheral surfaces of the hook portions 50, 50 is the outermost distance. In addition to being larger than the diameter D4, the distance W3 between the opposing hook portions 50, 50 in both divided pieces 49A, 49B has a dimensional relationship that is much smaller than the outer diameter D4 of the circular bottom surface of the annular recess 45b. Is set. As a result, the pipe detachment preventing device 41 of the present invention allows the hook portion 50 to be placed on the circular bottom surface of the annular recess 45b when the retaining ring 49 is moved along the radial direction of the union nut 45 (up / down / left / right direction) in the temporarily assembled state. so as not to separate from the union nut 45 is brought into contact, are also available easily it assembled in the field. Further, in the pipe detachment preventing device 41 of the present invention, in the temporarily assembled state, the closest interval W1 between the inner peripheral surfaces of the opposing hook portions 50, 50 in each divided piece 49A (49B) of the retaining ring 49 is a union nut. When the retaining ring 49 is moved forward along the axial direction of the union nut 45, the hook portion 50 is moved to the union nut 45. The front annular side wall surface 45c is not separated from the union nut 45 so that the assembly at the site can be simplified.

  The present invention pipe detachment preventing device 41 configured as described above is cast-molded at a factory, temporarily assembled as necessary, and shipped in this state. First, as shown in FIG. 11, the temporary assembly is divided on both sides while inserting the hook portions 50 of the two divided pieces 49 </ b> A and 49 </ b> B separated from the retaining ring 49 into the annular recess 45 b of the union nut 45. The flange portions 49d and 49d of the piece 49A (49B) are connected to each other with a bolt 7 and a nut 8 that are temporarily tightened, and then a union nut 45 in which a rubber packing 4 (see FIG. 9B) is inserted is received as a receptacle. By screwing into the portion 2b, the hook portions 50 of the split pieces 49A and 49B are brought into a temporarily assembled state in which they are arranged loosely on the outer peripheral surface of the annular recess 45b of the union nut 45.

  Next, at the construction site, the joining pipe 3 is inserted into the present invention pipe detachment preventing device 41 in the temporarily assembled state. Since the insertion can be made to match the central axes of the snap ring 49, the union nut 45, the packing 16, and the pipe or joint body 2 in the temporarily assembled state, It is only necessary to insert the union nut 45 and the packing 16 from the retaining ring 49 side to reach the inside of the pipe or the joint body 2, which is extremely easy. Thereafter, the union nut 45 is manually rotated to temporarily fix the joining pipe 3, and then tightened to a minimum tightening torque necessary for water tightness with a tool such as a spanner or a pipe wrench. The tightening operation 47 can be performed easily and quickly because there is nothing that hinders the turning operation of the tool around the union nut 45. After confirming that the retightening of the union nut 45 has been completed, turn this so that the fastening portion of the retaining ring 49 by the bolt 7 and the nut 8 can be easily tightened (for example, the position where the nut 8 is upward). Move. Finally, the retaining ring 49 is fastened. Fastening of the retaining ring 49 was determined by determining the axial positioning with respect to the joining pipe 3 and the direction of the bolt fastening portion, and then finally tightening the bolt 7 and the nut 8 and engraved on the inner peripheral surface of the retaining ring 49. What is necessary is just to carry out so that a saw-tooth may bite into the outer peripheral surface of the joining pipe 3, and the anti-slip | skid function may be exhibited.

  As a result, as shown in FIG. 10, the joining pipe 3 can flexibly expand and contract within a range in which each hook portion 50 of the retaining ring 49 can move on the outer peripheral surface of the annular recess 45 b of the union nut 45. The pipe detachment preventing device 41 according to the present invention has an inner diameter D2 of the curved inner peripheral surface of the hook portions 50, 50... The outer diameter D4 of the circular bottom surface is made larger, and the thickness T of the hook portion 50 is set to be smaller than the groove width K of the annular recess 45b of the union nut 45.

The pipe detachment preventing device 41 of the present invention allows the connecting pipe 3 to be inserted and removed while maintaining the state where the retaining ring 49 is connected to the expansion / contraction flexible pipe joint 46 by tightening or loosening the bolt 7 and the nut 8 of the retaining ring 49. Since it is possible, it can be used repeatedly.

The pipe detachment preventing device 41 of the present invention can prevent the joining pipe 3 from detaching by using a single retaining ring 49, so that it can be easily attached to the expansion / contraction flexible pipe joint 46 and the manufacturing cost can be reduced. Furthermore, the pipe detachment prevention device 41 of the present invention uses a single retaining ring 49 that can be in a temporarily assembled state that is not separated from the pipe or the joint body 2, thereby assembling the telescopic flexible pipe joint with the pipe detachment prevention device at the construction site. Can be simple.

DESCRIPTION OF SYMBOLS 1 ... Conventional pipe detachment | desorption prevention apparatus, 2 ... Pipe or joint main body, 2a ... Male screw, 2b ... Receiving part, 2c ... Tightening tool hook part, 3 ... Joining pipe, 4 ... Rubber packing, 5 ... Union nut, 5a DESCRIPTION OF SYMBOLS ... Circular rear end surface, 6 ... Telescopic flexible pipe joint, 7 ... Bolt, 8 ... Nut, 9 ... Retaining ring, 9A ... Split piece, 9B ... Split piece, 10 ... Joint fitting part, 10A ... Split piece, 10B ... Divided piece, 10c ... Flange part, 11 ... Arm, 12 ... Hook part, 14 ... Locking ear part, 21 ... Invention pipe detachment preventing device, 29 ... Retaining ring, 29A ... Divided piece, 29B ... Divided piece, 29c ... bolt insertion hole, 29d ... flange part, 29d '... mating surface, 29e ... semicircular curved part, 29f ... sawtooth, 29g ... projection, 30 ... hook part, 30a ... mating surface, 31 ... arm, 41 ... Invention pipe detachment prevention device, 45... Union nut, 45 b. 45c: front annular side wall surface, 46: expansion / contraction flexible pipe joint, 49 ... retaining ring, 49A ... split piece, 49B ... split piece, 49c ... bolt insertion hole, 49d ... flange part, 49g ... projection, 50 ... hook , 51... Arm, D1... Outer diameter of outer peripheral surface of pipe or joint body 2, D2... Inner diameter of inner peripheral surface of hook portions 30 and 30 (50, 50), D3. Outer diameter D4: outer diameter of the circular bottom surface of the annular additional recess 45a of the union nut 45, D5: outer diameter of the front annular side wall surface 45c of the annular additional recess 45a of the union nut 45, E: gap, G: union nut 5 and pipe Alternatively, the distance between the joint body 2 and the fastening tool hooking portion 2c, K: the groove width of the annular additional recess 45a of the union nut 45, T: the thickness of the hook portion 30 (50), W1: the opposing hook portion 30, Of 30 (50, 50) Closest to the interval of the surface, W2 ... opposing farthest distance between the inner peripheral surface of the hook portion 30, 30 (50, 50), the spacing between W3 ... facing hook portions 30 and 30 (50, 50)

Claims (3)

Insert a screw-free joining tube into a pipe or joint body with a receiving part with a male thread engraved on the outer peripheral surface on the front end side, insert an annular rubber packing, and screw the union nut into the receiving part. A snap ring provided on an expansion / contraction flexible pipe joint with a structure to be tightened and tightened by a bolt and a nut that is externally fitted to the joint pipe on the front side of the union nut, and a union nut. A pipe detachment preventing device including a hook portion that is arranged loosely on an outer peripheral surface of a rear pipe or a joint main body and can be locked to a union nut, and an arm that connects the retaining ring and the hook portion, The retaining ring has a flange portion provided with an insertion hole for the bolt to the outside from both end portions of each divided piece, the arm extends from only the flange portion to the rear, and the rear end of each arm in the one of the hook portion Separately comprising four arms with a hook portion provided integrally, the outer peripheral surface of the outer peripheral surface and the tube or the joint body of the union nut from between the facing hook portion with the arm in the respective segments of when the tightening is projected A pipe detachment preventing device for a union nut joint. The retaining ring is screwed into the receiving part with a union nut placed inside surrounded by four arms by connecting the flanges of the split pieces on both sides with bolts and nuts so that the joining pipe can be loosely fitted. By doing so, the four hook parts are placed in a loosely assembled state on the outer peripheral surface of the pipe or joint body, and in the temporarily assembled state, the inner peripheral surface of the opposing hook part in each divided piece is the most The approaching interval is smaller than the outer diameter of the outer peripheral surface of the region facing the hook part in the pipe or joint body, and the distance between the inner peripheral surfaces of the hook part is greater than the outer diameter. Is set so that the distance between the opposing hook portions is much smaller than the outer diameter, and the hook portion is moved along the radial direction of the union nut when the hook portion is moved to the outer peripheral surface of the pipe or joint body. to abut against Has become the tube or the joint body so as not to separate, and when the temporarily assembled state, abuts when moving to the front along the retaining ring in the axial direction of the union nut, a hook portion on the rear end face of the union nut 2. The pipe detachment preventing device for a union nut joint according to claim 1 , wherein the retaining ring is not separated from the telescopic flexible pipe joint . Insert a screw-free joining tube into a pipe or joint body with a receiving part with a male thread engraved on the outer peripheral surface on the front end side, insert an annular rubber packing, and screw the union nut into the receiving part. A snap ring provided on an expansion / contraction flexible pipe joint with a structure to be tightened and tightened with a bolt and a nut that is externally fitted to a joint pipe on the front side of the union nut, and a front end of the union nut A pipe detachment preventing device including a hook portion that is loosely arranged in an annular recess formed on the side and can be locked to a side surface of the annular recess, and an arm that connects the retaining ring and the hook portion, The retaining ring has a flange portion provided with an insertion hole for the bolt to the outside from both end portions of each divided piece, the arm extends from only the flange portion to the rear, and the rear end of each arm individually one of the hook portions on one Comprising four arms with a hook portion provided in the retaining ring includes an annular recess the four hook portions by connecting the joint tube with a bolt and nut flange each other on both sides of the divided pieces so as to be loosely fitted case When it is in a temporarily assembled state, the closest distance between the inner peripheral surfaces of the opposing hook portions in each divided piece is smaller than the outer diameter of the circular bottom surface of the annular recess of the union nut and the hook. The distance between the outermost surfaces of the inner peripheral surface of the portion is larger than the outer diameter, and the distance between the opposing hook portions in both divided pieces is much smaller than the outer diameter of the circular bottom surface of the annular recess. When the hook is moved along the radial direction of the union nut, the hook is brought into contact with the bottom surface of the annular recess so as not to be separated from the union nut. , When moving to the front along the retaining ring in the axial direction of the union nut, the union, characterized in that it is brought into contact with the hook portion on the front annular side wall surface of the union nut so as not to separate from the union nut Pipe joint prevention device for nut joints.

Images