JP2017067176A - Joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure having a superior sealing characteristic and low cost capable of releasing easily a connected state of pipe members without requiring any surplus space.SOLUTION: A joint structure 10 includes a gasket 6 present between extremity ends of a pair of pipe members 1, 2; sleeves 3, 4 fitted to outer circumferences of the pipe members 1, 2; a male nut 7 fitted to an outer periphery of the sleeve 3 to have a male thread part 7a; and a female nut 8 fitted to an outer circumference of the sleeve 4 and having a female thread part 8a to which the male thread part 7a is screwed. Under a state in which the male thread part 7a of the male nut 7 is screwed into the female thread part 8a of the female nut 8, the pipe members 1, 2 are communicated to each other through the gasket 6 and sealed. Under a state in which the engaged form in thread between the male nut 7 and the female nut 8 is released and separated from each other, the pipe members 1, 2 can be slid relatively in a direction B orthogonal to a fluid flowing direction A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a joint structure.

  In piping equipment for circulating a fluid, a joint structure for connecting hollow pipe members is used. For example, as a member for connecting two pipe members, there is a union joint as shown in Patent Document 1. Specifically, a union screw is attached to the end of one pipe member, a union collar is attached to the end of the other pipe member, a union nut is placed across both ends, and a part of the union nut is attached to the union collar. And the two pipe members are connected by screwing a union screw into the female thread portion of the union nut.

JP 2011-252577 A

  In a piping facility including two pipe members connected to each other, it may be necessary to release the connection of the pipe members in order to repair, replace, or maintain some of the pipe members and parts in the pipes. . In such a case, for example, after loosening the union nut and releasing the screwing with the union screw, a gap is made between the other tube member by retracting one tube member in the longitudinal direction. However, in a piping facility, securing a space for retreating the pipe member in the longitudinal direction greatly reduces the space efficiency and leads to an increase in the size of the facility. Moreover, in joint structures, such as a union joint, the sealing performance which prevents a fluid leak, and cost reduction are desired.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a joint structure that has good sealing properties and is low in cost, and can be easily disconnected from a pipe member without requiring extra space.

  The joint structure for joining a pair of pipe members according to the present invention includes a gasket having an opening, a sleeve fitted on the outer periphery of the pipe member, interposed between the tip portions of the pair of pipe members, Is fitted on the outer circumference of the sleeve located on the outer circumference of the tube member, and is fitted on the outer circumference of the sleeve located on the outer circumference of the other pipe member and the male nut having the male screw portion on the outer circumference. And a female nut having a female screw part into which the male screw part of the male nut is screwed. In a state where the male thread portion of the male nut is screwed into the female thread portion of the female nut, one pipe member pushed from the male nut via the sleeve and the other pipe member pushed from the female nut via the sleeve , Communicated through a gasket and sealed. When the male nut and the female nut are disengaged and separated from each other, the one pipe member and the other pipe member are relatively relative to each other in a direction intersecting the fluid flow direction between the pipe members. Is slidable.

  According to the joint structure of the present invention, good sealing performance and low cost can be realized, and furthermore, the connection of the pipe member can be easily released without requiring extra space.

It is sectional drawing which shows the joint structure of the 1st Embodiment of this invention. It is sectional drawing which shows the connection cancellation | release state of the joint structure shown in FIG. It is a schematic diagram which shows an example of the piping installation containing the joint structure shown in FIG. It is sectional drawing which shows the joint structure of the 2nd Embodiment of this invention. It is sectional drawing which shows the joint structure of the 3rd Embodiment of this invention. It is sectional drawing which shows the joint structure of the 4th Embodiment of this invention. It is sectional drawing which shows the joint structure of the 5th Embodiment of this invention. It is sectional drawing which shows the joint structure of the 6th Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 and 2 show a joint structure 10 according to a first embodiment of the present invention. This joint structure 10 connects a hollow pipe member 1 to another pipe member 2 and enables fluid to flow between the pipe members 1 and 2. The joint structure 10 is held by the sleeve 3 via the retainers 5, the sleeves 3 and 4 fitted into the outer peripheral portions of the pipe members 1 and 2, the retainer 5 attached to one sleeve 3, and the retainer 5. A gasket 6, a male nut 7 fitted into the outer peripheral portion of one sleeve 3, and a female nut 8 fitted into the outer peripheral portion of the other sleeve 4.

  The detailed configuration will be described. The pipe members 1 and 2 of the present embodiment are integrally formed with large-diameter flare portions 1a and 2a at the tip portions. The sleeves 3 and 4 have engaging portions 3a and 4a that engage with the flare portions 1a and 2a, respectively, at the tip portions. The male nut 7 fitted into the outer peripheral portion of the sleeve 3 has a male screw portion 7a formed on the outer peripheral portion, and engages with an engaged portion (slope 3b in the illustrated example) on the inner peripheral portion. A joint portion 7b is formed. The female nut 8 fitted into the outer peripheral portion of the sleeve 4 is engaged with the inner peripheral portion of the female screw portion 8a that is screwed into the male screw portion 7a of the male nut 7, and the engaged portion (slope surface 4b) of the sleeve 4. An engaging portion 8b is formed. The female nut 8 is larger than the male nut 7, and the portion where the female screw portion 8 a on the inner peripheral portion of the female nut 8 is formed is larger than the portion where the male screw portion 7 a on the outer peripheral portion of the male nut 7 is formed. Large diameter. The female nut 8 is provided with a hole portion 8c communicating with a space where the gasket 6 is located. The hole 8c is used when a gas leak test is performed to confirm the sealing performance.

  Moreover, each front-end | tip part of the pipe members 1 and 2 is tapered, and has the inclined surfaces 1b and 2b. The gasket 6 has a disk shape having an opening 6 a that communicates with the hollow portions of the pipe members 1 and 2 as opposed to each other. And the corresponding inclined surface 6b of the shape corresponding to the inclined surfaces 1b and 2b of the pipe members 1 and 2 is provided in the surface facing the tube members 1 and 2 of the gasket 6, respectively. That is, when the pipe members 1, 2 approach the gasket 6, the inclined surfaces 1b, 2b come into close contact with the corresponding inclined surface 6b. The inclined surfaces 1b and 2b of the pipe members 1 and 2 and the corresponding inclined surface 6b of the gasket 6 are all formed over the entire circumference and are in close contact with each other without any gap.

  The retainer 5 includes a cylindrical portion 5a that is fitted to the outer peripheral portion of the sleeve 3, and a locking portion 5b that protrudes radially inward from the end portion of the cylindrical portion 5a. When the gasket 6 is inserted into the cylindrical portion 5 a and the cylindrical portion 5 a is fitted into the outer peripheral portion of the sleeve 3, the gasket 6 is locked by the locking portion 5 b and is held by the sleeve 3 and the retainer 5 so as not to be detached. Is done. In this embodiment, since the recessed part 3c which the cylindrical part 5a of the retainer 5 fits is provided in the outer peripheral part of the sleeve 3, the retainer 5 is fixed to the sleeve 5 firmly. Although it is not necessary to provide a recess in the sleeve 4, there may be a case where the recess 4 c is provided in the sleeve 4 in order to make the parts common for reducing the manufacturing cost.

  Since it is such a structure, in this embodiment, the sleeves 3 and 4 are first fitted in the outer peripheral part of the pipe members 1 and 2. FIG. At this time, the sleeves 3 and 4 are fitted into the outer peripheral portions of the tube members 1 and 2 from the side opposite to the tip portions of the tube members 1 and 2 (the side opposite to the portion where the flare portions 1a and 2a are formed). The 3 and 4 engaging portions 3a and 4a are brought into contact with the flare portions 1a and 2a. The gasket 6 is inserted into the cylindrical portion 5 a of the retainer 5, and the retainer 5 is attached to the tip of the sleeve 3, thereby fixing the tube member 1, the sleeve 3, the retainer 5, and the gasket 6 to each other. Further, the male nut 7 is fitted into the outer peripheral portion of the sleeve 3. The male nut 7 is fitted into the outer peripheral portion of the sleeve 3 from the side opposite to the distal end portion of the tube member 1, and the engaging portion 7 b of the male nut 7 is brought into contact with the inclined surface 3 b of the sleeve 3. On the other hand, the female nut 8 is fitted into the outer peripheral portion of the sleeve 4 from the side opposite to the distal end portion of the tube member 2, and the engaging portion 8 b of the female nut 8 is brought into contact with the inclined surface 4 b of the sleeve 4.

  In this state, the distal end portion of the tube member 1 and the distal end portion of the tube member 2 are opposed to each other, the male nut 7 and the female nut 8 are brought close to each other, and the male screw portion 7a is screwed into the female screw portion 8a. Thereby, the tube member 1 pushed from the male nut 7 via the sleeve 3 approaches the tube member 2, and the tube member 2 pushed from the female nut 8 via the sleeve 4 approaches the tube member 1. Then, the distal ends of the pipe members 1 and 2 penetrate deeper into the opening 6 a of the gasket 6, and the tapered inclined surface 1 b of the distal ends of both the pipe members 1 and 2 is in close contact with the corresponding inclined surface 6 b of the gasket 6. Abut. Therefore, the pipe members 1 and 2 and the gasket 6 are better sealed. That is, since the inclined surfaces 1b and 2b function like a wedge, the sealing performance of the joint structure 10 is enhanced.

  In this joint structure 10, when the connection is released for repair or replacement of some parts, one or both of the male nut 7 and the female nut 8 are rotated to loosen the screw (release the screw engagement). ). The female nut 8, which has been released from the fixation with the male nut 7, is moved away from the male nut 7 by moving to the side opposite to the tip of the pipe member 2. Then, the pipe members 1 and 2 can be displaced in a direction intersecting with the direction of fluid flow (direction A) between the pipe members 1 and 2. Therefore, one or both of the tube members 1 and 2 are slid in a direction (direction B) orthogonal to the direction A. As a result, the pipe members 1 and 2 come to positions where the tip portions do not face each other, so that the pipe members 1 and 2 are removed, or any part (not shown) connected to the pipe members 1 and 2 is removed. Work can be done.

  Thus, in the present invention, when the connection between the tube members 1 and 2 is released, the tube members 1 and 2 do not need to be retracted in the direction A so that the tip portions are separated from each other, and intersect the direction A. What is necessary is just to slide to the direction B, specifically, the direction B orthogonal to the direction A. The direction A is substantially the same as the longitudinal direction of the pipe members A and B.

  It is possible to release the connection of the tube members 1 and 2 by retracting either one or both of the tube members 1 and 2 in the direction A. In order to retract the tube members 1 and 2 in the direction A, However, it is necessary to leave an extra space in the piping facility, resulting in deterioration of space efficiency and an increase in size of the piping facility. Moreover, since there exists a possibility of inhibiting the connection of the pipe members 1 and 2 and other piping components (not shown), it may be difficult to retract the pipe members 1 and 2 in the direction A. On the other hand, in this embodiment, the pipe members 1 and 2 can slide in the direction B orthogonal to the direction A. Therefore, there is no need to retract the pipe members 1 and 2 in the direction A when releasing the connection of the pipe members 1 and 2, and there is a possibility that the space efficiency of the piping facility is deteriorated and the size of the pipe equipment is increased. The possibility of hindering connection with other piping parts can be eliminated. And connection of the pipe members 1 and 2 can be cancelled | released easily.

  In FIG. 1, although extremely illustrated for easy understanding, in the connected state, the distal ends of the pipe members 1 and 2 slightly enter the opening 6 a of the gasket 6. Therefore, strictly speaking, it is necessary to let the distal ends of the pipe members 1 and 2 escape from the opening 6a of the gasket 6, but the amount of movement for escape is very small. Therefore, in a state where the female nut 8 is retracted away from the male nut 7, the pipe members 1 and 2 can slide in the direction B, and it can be said that there is substantially no need to retract in the direction A. In the present embodiment, a mechanism for sliding at least one tip portion of the tube members 1 and 2 in the direction B may be provided, but the tube members 1 and 2 are arranged in the direction B without using a special mechanism. It may have a play that can slide slightly.

  As described above, according to the present embodiment, it is possible to connect the pipe members 1 and 2 having a high sealing property using the gasket 6 and to remove the pipe members 1 and 2 by releasing the connection. It can be done very easily.

  The flare portions 1a and 2a of the tube members 1 and 2 are integrally formed by subjecting the tube members 1 and 2 to a known flare process. When the pipe members 1 and 2 are processed into a large-diameter flange by flaring, the gripping force is directly applied to the pipe members 1 and 2 by holding the sleeves 3 and 4 with a tool (not shown). The possibility of being slightly crushed and adding resistance to fluid flow can be eliminated. By using the sleeves 3 and 4 as pressing jigs in the flare processing, the flare processing can be performed safely and easily. As described above, when the flare portions 1a and 2a are integrally formed with the pipe members 1 and 2 by flaring the pipe members 1 and 2, a flange-like separate member is welded to the pipe members 1 and 2 by a method such as welding. Compared to the case of mounting, the cost is low.

[Piping equipment]
In FIG. 3, an example of the piping installation which employ | adopted the joint structure 10 of this invention is shown typically. In this piping facility, the manifold 11 and the pump 12 are connected via a piping 13, a valve 14, an elbow 15, and the like. The joint structure 10 of the present invention is provided between the manifold 11 and the valve 14. Specifically, the pipe member 2 positioned between the manifold 11 and the valve 14 and the pipe member 1 connected to the manifold 11 are connected by the joint structure 10 having the above-described configuration. The valve 14 and the pump 12 are connected by a straight pipe 13 and an elbow 15 located at a turning point.

  In this piping facility, for example, when it becomes necessary to remove the valve 14 for replacement or maintenance, as described above, the male nut of the joint structure 10 connected to the pipe member 2 connected to the valve 14. 7 and the female nut 8 are unscrewed, and the female nut 8 is retracted. Then, either one or both of the tube members 1 and 2 are slid in a direction (direction B) orthogonal to the direction of fluid flow (direction A) between the tube members 1 and 2. Thereby, the connection of the pipe members 1 and 2 is released. Therefore, the valve 14 is removed from the pipe member 2. As an actual detaching method, it is conceivable to remove the valve 14 from the pipe 13 after removing the pipe member 2 that has been disconnected from the pipe member 1 and freed at one end to expose the valve 14. Further, the valve 14 may be removed by any other method, but in any case, the connection of the pipe members 1 and 2 can be easily released by the joint structure 10 of the present invention. Becomes easier. And even if piping equipment is complicated, even if there is almost no empty space around piping equipment, connection of pipe members 1 and 2 can be performed easily. Which of the pipe members 1 and 2 is to be slid in the direction B or both may be determined appropriately according to the layout of the piping equipment, etc., and the one having sufficient space in the direction B is slid. You can do it. In other words, in the present invention, it is important that the pipe members 1 and 2 are relatively slidable in the direction B. The relative movement amount of the slide may be small, and may be shifted so that the flare portions 1a and 2a do not face each other.

[Second Embodiment]
FIG. 4 shows a joint structure 20 according to a second embodiment of the present invention. Here, only differences from the joint structure 10 of the first embodiment will be described, the same reference numerals are given to the same parts as those of the first embodiment, and description thereof will be omitted.

  In the joint structure 20 of the present embodiment, the flared portions 21a and 22a at the distal ends of the pipe members 21 and 22 are each in the form of a flange that extends at right angles to the longitudinal direction, and the pipe members 1 and 2 of the first embodiment. It does not have a sloping surface. The gasket 23 is provided with an annular protrusion 23a on the surface facing the tip of the tube member, and the protrusion 23a is in contact with the flare portions 21a and 22a. Since the protruding portion 23a is formed without interruption over the entire circumference, high sealing performance is realized by the protruding portion 23a coming into contact with the flare portions 21a and 22a. And according to this structure, while flaring processing of the pipe members 21a and 22 becomes easy, the slide to the direction B of the pipe members 21 and 22 at the time of a connection release is not prevented at all, and it can carry out more smoothly and easily. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

[Third Embodiment]
FIG. 5 shows a joint structure 30 according to a third embodiment of the present invention. Here, only differences from the joint structure 10 of the first embodiment will be described, the same parts as those of the first embodiment will be given the same reference numerals, and description thereof will be omitted.

  In the joint structure 30 of the present embodiment, the flare portion is not formed at the distal end portion of the pipe members 31 and 32, but the tapered inclined surfaces 1b and 2b are formed. And the external thread part 31a, 32a is formed in the outer peripheral part of this pipe member 31, 32, respectively. The male screw portions 31 a and 32 a are left-hand screws formed in a direction opposite to a normal screw such as the male screw portion 7 a of the male nut 7. Then, on the inner peripheral portions of the sleeves 33 and 34, female screw portions 33a and 34a that are screwed into the male screw portions 31a and 32a are formed.

  According to this configuration, as in the first embodiment, high sealing performance is obtained by the inclined surfaces 1 b and 2 b of the pipe members 31 and 32 biting into the corresponding inclined surfaces 6 a of the gasket 6. Further, since the pipe members 31, 32 and the sleeves 33, 34 are firmly fixed by screwing the male screw portions 31a, 32a and the female screw portions 33a, 34a, the connection reliability is high. Moreover, the direction in which the male screw portions 31a and 32a are screwed into the female screw portions 33a and 34a is the opposite direction (left screw) to the direction in which the male screw portion 7a of the male nut 7 is screwed into the female screw portion 8a of the female nut 8 (right screw). In order to release the connection, even if the screwing of the male screw part 7a of the male nut 7 and the female screw part 8a of the female nut 8 is released, the screw is not loosened, and the screwing is not released unintentionally. Therefore, it is not necessary to perform unnecessary work for disassembling and assembling the joint structure. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

[Fourth Embodiment]
FIG. 6 shows a joint structure 40 according to a fourth embodiment of the present invention. Here, only differences from the joint structures of the first to third embodiments will be described, and the same parts as those of the first to third embodiments will be given the same reference numerals and description thereof will be omitted.

  In the joint structure 40 of the present embodiment, the sleeves 41 and 42 are smaller than the sleeves 33 and 34 of the third embodiment, and do not extend to the outside of the male nut 7 or the female nut 8. In the first to third embodiments, in order to prevent stress from being concentrated on a part of the pipe member and being easily damaged, the sleeve is lengthened and extended to the outside of the male nut 7 or the female nut 8, and the male nut 7 Further, contact between the female nut 8 and the pipe member is prevented (the extended portion of this sleeve is called an envelope). However, in this embodiment, when it is determined that the risk of breakage of the pipe members 1 and 2 is small, the sleeve is downsized to reduce the manufacturing cost, and the holding stability of the female nut 7 and the male nut 8 is improved. Is increasing. Since other configurations are the same as those of the third embodiment, description thereof is omitted.

[Fifth Embodiment]
FIG. 7 shows a joint structure 50 according to a fifth embodiment of the present invention. Here, only differences from the joint structures of the first to fourth embodiments will be described, and the same parts as those of the first to fourth embodiments will be given the same reference numerals and description thereof will be omitted.

  In the joint structure 50 of this embodiment, the flare part is not formed in the front-end | tip part of the pipe members 51 and 52, but the protrusion parts 51a and 52a are formed in the end surface. The protruding portions 51a and 52a are brought into contact with the flat surface of the gasket 53 having no corresponding inclined surface. Since the protruding portions 51a and 52a are formed without interruption over the entire circumference, high sealing performance is realized by the protruding portions 51a and 52a coming into contact with the flat surface of the gasket 53. According to this configuration, the shape of the gasket 53 is simple and easy to manufacture. Since the pipe members 51 and 52 are not so easily manufactured as compared with the pipe members of the third and fourth embodiments having inclined surfaces, the manufacturing of the entire joint structure can be simplified. Since other configurations are the same as those of the third embodiment, description thereof is omitted.

[Sixth Embodiment]
FIG. 8 shows a joint structure 60 according to a sixth embodiment of the present invention. Here, only differences from the joint structures of the first to fifth embodiments will be described, the same parts as those of the first to fifth embodiments will be given the same reference numerals, and description thereof will be omitted.

  In the joint structure 60 of the present embodiment, the sleeves 41 and 42 are small as in the fourth embodiment, and do not extend to the outside of the male nut 7 or the female nut 8. That is, it is determined that the risk of breakage of the pipe members 51 and 52 is small, and the sleeves 41 and 42 are downsized to reduce the manufacturing cost, and the holding stability of the female nut 7 and the male nut 8 is increased. . Since other configurations are the same as those of the fifth embodiment, description thereof is omitted.

1, 2, 21, 22, 31, 32, 51, 52 Tube members 1a, 2a, 21a, 22a Flare portions 1b, 2b Inclined surfaces 3, 4, 33, 34, 41, 42 Sleeves 3a, 4a Engaging portions 3b , 4b Engagement part (slope)
3c, 4c Recessed part 5 Retainer 5a Cylindrical part 5b Locking part 6, 23, 53 Gasket 6a Opening part 6b Corresponding inclined surface 7 Male nut 7a Male thread part 7b Engagement part 8 Female nut 8a Female thread part 8b Engagement part 8c Hole 10 , 20, 30, 40, 50, 60 Joint structure 23a Projection 31a, 32a Male thread 33a, 34a Female thread 51a, 52a Projection

Claims (6)

A joint structure for joining a pair of pipe members,
A gasket interposed between the distal ends of the pair of pipe members and having an opening;
A sleeve fitted into the outer periphery of the tube member;
A male nut fitted into the outer circumference of the sleeve located on the outer circumference of one of the tube members, and having a male screw portion on the outer circumference;
A female nut fitted into the outer circumference of the sleeve located on the outer circumference of the other pipe member, and having an internal thread portion into which the external thread portion of the male nut is screwed,
Have
In a state where the male screw portion of the male nut is screwed into the female screw portion of the female nut, one of the pipe members pushed from the male nut via the sleeve, and from the female nut via the sleeve The other pressed pipe member communicates with and is sealed through the gasket,
In a state where the male nut and the female nut are unscrewed and separated from each other, one of the tube members and the other tube member intersect with the fluid flow direction between the tube members. A joint structure that is relatively slidable in the direction.   The joint structure according to claim 1, wherein each of the sleeves has an engaging portion that engages with a flare portion formed at the distal end portion of the pipe member. The inner peripheral portion of the sleeve is provided with a female screw portion that is screwed with a male screw portion formed on the outer peripheral portion of the tube member,
The joint structure according to claim 1, wherein a direction in which the male screw portion of the pipe member is screwed into the male screw portion of the sleeve is opposite to a direction in which the male screw portion of the male nut is screwed into the female screw portion of the female nut. .   The tip of the tube member is tapered and has an inclined surface, and a corresponding inclined surface corresponding to the inclined surface is formed on a surface of the gasket facing the tube member. 4. The joint structure according to any one of 3 above.   The surface of the gasket facing the tube member is provided with a protrusion that contacts the distal end surface of the tube member, and the protrusion is formed without interruption over the entire circumference. Item 5. The joint structure according to any one of Items 1 to 4.   The tip of the tube member is provided with a protrusion that contacts the surface of the gasket facing the tube member, and the protrusion is formed without interruption over the entire circumference. Item 5. The joint structure according to any one of Items 1 to 4.

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