JP3198179U - High pressure joint structure - Google Patents

Abstract

The present invention provides a high-pressure joint that improves the efficiency of pipe replacement and equipment replacement work, and improves the sealing performance and vibration resistance of the joint. A first joint 2a, a second joint 2b, a pair of clamp members 4, a seal member 3 and a clamping member that press-contact each joint in a butting direction. The outer diameter of each end of each joint in the butted portion is larger than the outer diameter of the intermediate portion of each joint. When the first joint and the second joint are butted, the inner surface of the recess in the clamp member and each end of each joint A clamp member is formed so that the parts fit. The clamp member is provided with a first clamp 4a provided with first through holes 8a and 8b serving as insertion holes for the tightening member, and a second through hole 9a and 9b provided with second through holes 9a and 9b serving as an outlet port for the tightening member. The first clamp 4a and the second clamp 4b are configured so that the end portions of the joints and the inner surfaces of the recesses are in contact with each other and the inner surfaces of the tightening portions are not in contact with each other. Is designed to occur. [Selection] Figure 1

Description

  The present invention relates to a high pressure joint structure such as a high pressure pipe or a high pressure device.

  In the case of a conventional joint structure for high-pressure pipes, as shown in FIG. 6, with the ground nut attached to the tip of the high-pressure pipe, the ground nut is screwed into the joint body, whereby the high-pressure pipe is passed through the ground nut. Was attached to the joint body. That is, as shown in FIG. 6, conventionally, a gland nut 52 is inserted into the pipe 50 from the distal end portion 54 of the pipe 50 and fixed by screwing 51 into the screw hole 62 of the joint body 60. Are installed. As a result, the through hole 61 of the joint body 60 and the inner hole 11 of the pipe 50 communicate with each other.

However, the conventional high pressure pipe joint structure has the following problems.
First, the first problem is that the pipe for the joint has entered, so that it is necessary to remove the pipe when replacing the pipe. In particular, in a plant where piping is assembled in a narrow space, or when it is installed inside an apparatus, there is a problem that assembly and disassembly cannot be performed unless the assembly order and disassembly order are performed correctly, which is troublesome. .
In the case of a conventional joint for high-pressure pipes, when a joint in one direction is tightened, the torsion of the screw is transmitted to the pipe, and the other joint is liable to be loosened.
Furthermore, in the case of a conventional joint for high-pressure pipes, since the pipe ends are stopped with a wire seal, a large torque cannot be applied to the screw (only a small torque can be applied), and the vibration strength is low. There is a problem.

Under such circumstances, there is a demand for a high-pressure pipe joint that improves the efficiency of pipe replacement work and improves the sealing performance and vibration resistance of the pipe joint.
Here, a pipe joint is known that improves sealing performance by using a clamp having a plurality of inwardly projecting deforming claws on the inner surface of the band part that covers the fitting part of both bands to be joined (see, for example, Patent Document 1). ). However, in the pipe joint disclosed in Patent Document 1, it is difficult to ensure sufficient sealing performance when it is assumed to be used for a high-pressure pipe.

Under such circumstances, the present inventors have already proposed a high-pressure pipe joint that can improve the efficiency of pipe replacement and equipment replacement work and can improve the sealing performance and vibration resistance of the pipe joint.
The proposed joint for high-pressure pipes is a pipe joint that joins a first pipe and a second pipe, a first joint that joins the first pipe, a second joint that joins the second pipe, A band portion that covers the butted portion of the joint and the second joint, a clamp that joins the first joint and the second joint in a butted state, a seal ring that maintains the sealing property of the butted portion, and a band portion that is tightened It consists of a fastening bolt that reduces the inner diameter. In addition, the outer diameter of each end of the first joint and the second joint in the butt portion is larger than the outer diameter of the intermediate portion between the first joint and the second joint, and is clamped in the butt state of the first joint and the second joint. The inner surface of the band portion is formed so that the inner surface of the band portion and each end of the first joint and the second joint are fitted (see Patent Documents 2 and 3).

Japanese Patent Laid-Open No. 9-196270 International Publication Pamphlet WO / 2015/019622 International publication pamphlet WO / 2015/019623

  In view of this situation, an object of the present invention is to provide a high-pressure joint that can improve the efficiency of pipe replacement and equipment replacement work and can improve the sealing performance and vibration resistance of the joint.

The inventors have intensively studied and devised a high-pressure joint structure that is efficient in pipe replacement and equipment replacement work, and has excellent joint sealing and vibration resistance.
In order to achieve the above object, the joint structure for high pressure of the present invention is a joint structure for connecting a first object and a second object, and is composed of the following 1) to 5).
1) A first joint that is coupled to the first object 2) A second joint that is coupled to the second object 3) A pair of butt end portions of the first joint and the second joint that are clamped and coupled in the butt direction Clamp member 4) Seal member that maintains the sealing performance of the abutting side end 5) A clamping member that narrows the gap between the pair of clamp members by clamping operation and presses the abutting side end

The first joint and the second joint of the above 1) and 2) are formed such that the outer diameter of the butt end portion is larger than the outer diameter of the joint intermediate portion. In addition, the clamp member of the above 3) is fitted with the abutting side end portion, and has a through hole and a recess so as to penetrate the joint intermediate portion. The seal member 4) is a seal ring, an O-ring, or a seal member already proposed by the present inventors.
Here, the first object and the second object include various types of pipes having different sizes and applications. In addition, safety valves, on-off valves, check valves, pressure reducing valves, filters, orifices, pressures are included. This includes equipment such as meters, flow meters, heat exchangers, compressors, and pressure vessels. That is, the high-pressure joint of the present invention can be used not only as a joint between pipes but also as a joint between pipes and equipment and a joint between equipments.
In the above 1) and 2), as described above, the coupling between the object and the joint is a coupling having a conventionally known configuration. It is possible to use a method of inserting and screwing into a screw hole of the joint (see FIG. 6) and a method of directly connecting the pipe and the joint by welding.

  By removing the clamp member, the first joint and the second joint can be shifted from the coaxial state, so that it is not necessary to remove the pipe, and the efficiency of pipe replacement work can be improved. Further, the sealing performance of the pipe joint can be improved by a sealing member such as a seal ring. Furthermore, in the above configuration, the tip of the pipe is coupled to the joint, and vibration can be absorbed at the butt portion between the joints, so that vibration resistance can be improved.

  In the high pressure joint structure of the present invention, the fastening member is a combination of at least two bolts and nuts, and a bolt hole is provided along the abutting direction of the pair of clamp members, and the bolt is inserted into the bolt hole. Is preferred. The reason why at least two sets are used is that the coupling member is located at the center of the clamp member, so that the fastening member must be disposed around the clamp member, and therefore, at least two positions sandwiching the center.

  Further, when a nut is used for fixing the clamp member, it is difficult to work because both bolts and nuts need to be operated during tightening and removal. Therefore, the tightening member is at least two bolts, and a bolt hole is provided along the abutting direction of the pair of clamp members. A female screw portion is formed on the inner wall of the bolt hole of one of the pair of clamp members. The female screw portion may be provided only on the inner wall of the bolt hole of the other clamp member. The tightening member may be only a tightening bolt having a male screw without using a nut. In that case, a female screw part is provided in the bolt hole of the clamp member on the side to be stopped by the nut. If the female screw portion is provided in the bolt hole of the clamp member on the side where the bolt is inserted, the gap between the clamp members cannot be narrowed, and therefore no female screw portion is provided.

  In the joint structure for high pressure of the present invention, when the abutting side ends of the first joint and the second joint are in contact with each other via the seal member, the end surfaces of the clamp members are not in contact with each other and a gap is generated. The gap between the end faces of the clamp member is narrowed by the tightening operation of the clamp member. In addition, the seal member is pressed and deformed thereby. Further, the clamping member is clamped between the first object and the clamp member in a state where the clamping member is bent because the gap between the clamping members gradually decreases from the central portion toward the peripheral position where the clamping member is located. The second object is combined. By bending the clamp member, stress is generated in the tightening bolt, and loosening of the tightening bolt can be suppressed.

  In addition, when a clamp member is fixed with a volt | bolt without using a nut, it is preferable that it is the length which a volt | bolt does not pull out from a volt | bolt hole. This is to prevent the bolt from becoming difficult to remove because the male screw portion at the tip of the bolt is damaged by contact after the clamp member is fixed with the bolt.

  In the joint structure for high pressure of the present invention, it is preferable that the contact surfaces of the concave portion of the clamp member and the abutting side end portion of the joint fitted in the concave portion are substantially orthogonal to the abutting direction. The surface where the concave part of the clamp member and the abutting side end of the fitting fitted to each other abut each other is substantially perpendicular to the abutting direction of the first joint and the second joint, respectively, thereby tightening the clamping member Can be efficiently transmitted to the joint. In addition, the contact surface may be formed in an oblique direction from the butting direction of the first joint and the second joint instead of being substantially orthogonal to the butting direction of the first joint and the second joint. A part of the tightening force to be tightened is applied in a direction other than the butting direction of the joint.

  According to the high pressure joint structure of the present invention, it is possible to improve the efficiency of pipe replacement and equipment replacement work, and to improve the sealing performance and vibration resistance of the pipe joint.

Configuration diagram of high-pressure joint of Example 1 Enlarged view of the high pressure joint of Example 1 after tightening Left side view of the high-pressure joint of Example 1 Configuration diagram of high-pressure joint of Example 2 The enlarged view of the contact part of a 1st coupling and a 1st clamp is shown, (1) shows Example 1, (2)-(4) has shown other embodiment. Configuration diagram of conventional high-pressure pipe fittings

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. The scope of the present invention is not limited to the following examples and illustrated examples, and many changes and modifications can be made.

The high pressure joint of Example 1 will be described with reference to FIGS.
The first embodiment is a pipe joint 1 that couples a first pipe 30a and a second pipe 30b.
The pipe joint 1 according to the first embodiment includes a first joint 2a that is coupled to the first pipe 30a, a second joint 2b that is coupled to the second pipe 30b, and a recess that covers the butted portions of the first joint 2a and the second joint 2b. 41, a clamp 4 that joins the first joint 2 a and the second joint 2 b in a butted state, a seal ring 3 that retains the sealing performance of the butted portion, and two tightening that press-contact the butted portion by a tightening operation It comprises bolts (5a, 5b).
The seal ring 3 is made of a metal material, and its shape has a diamond-shaped cut surface in the axial direction. The seal ring 3 is in contact with the end face of the opposing joint at the opposite vertex, thereby improving the sealing performance.

  The method of joining the first pipe 30a and the second pipe 30b is joining the first pipe 30a and the first joint 2a, and the second pipe 30b and the second joint 2b directly at the welded portion 45 by welding. Here, the 1st coupling 2a, the 1st pipe 30a, the 2nd coupling 2b, and the 2nd pipe 30b can be attached by other methods known conventionally. The same applies to the following embodiments.

  As shown in FIG. 1, the outer diameters of the end portions 22 of the first joint 2a and the second joint 2b in the abutting portion are larger than the outer diameter of the intermediate portion 21 of the first joint 2a and the second joint 2b. The inner surface of the concave portion 41 is formed so that the inner surface of the concave portion 41 in the clamp 4 and each end 22 of the first joint 2a and the second joint 2b can be fitted in the butted state of the joint 2a and the second joint 2b. Yes. In other words, the first joint 2 a and the second joint 2 b each have an outer diameter larger than that of the intermediate portion 21 at the end 22. However, the diameter (inner diameter) of the inner hole 11 is not particularly different between the end portion 22 and the intermediate portion 21. The difference between the end portion 22 and the intermediate portion 21 may be 2 to 3 mm, but is not particularly limited.

As shown in FIG. 1, in the recess 41, the clamp-side contact portions (6 a, 6 b) are provided substantially orthogonal to the abutting direction of the first joint and the second joint. Further, the joint-side contact portions (22a, 22b) provided at the respective end portions 22 are also provided substantially orthogonal to the abutting direction of the first joint and the second joint. Therefore, the force tightened by the tightening bolts (5a, 5b) is effectively transmitted in the direction in which each end 22 abuts.
As described above, the first joint 2a and the second joint 2b are in abutment state, and the inner surface of the recess 41 in the clamp 4 and the end portions 22 of the first joint 2a and the second joint 2b can be fitted to each other. 2a, the 2nd joint 2b, and the clamp 4 can be combined stably.

The first clamp 4a is provided with through holes (8a, 8b), and the second clamp 4b is provided with through holes (9a, 9b). The first clamp 4a and the first joint 2a come into contact with each other at the clamp side contact portion 6a and the joint side contact portion 22a, and the second clamp 4b and the second joint 2b have the clamp side contact portion 6b and the joint side contact portion 22b. However, the first clamp 4a and the second clamp 4b are not in contact with each other, and a gap 10 is formed on the inner surface (7a, 7b) of the tightening portion.
The fastening bolts (5a, 5b) are inserted through the through holes (8a, 8b), come out of the through holes (9a, 9b), and are screwed into the nuts (13a, 13b) to be fixed.

FIG. 2 shows an enlarged view of the high pressure joint of Example 1 after tightening.
As shown in FIG. 2, when the first and second clamps (4a, 4b) are fixed by the fastening bolts 5a, a gap 10 provided on the inner surfaces of the fastening portions of the first clamp 4a and the second clamp 4b is formed. It decreases and the inner surface (7a, 7b) of a fastening part approaches. Although not shown, this is the same in the case of fastening with the fastening bolt 5b.
The inner surfaces (7a, 7b) of the tightening portions of the first clamp 4a and the second clamp 4b are designed so that a gap 10 of approximately 4 mm is generated before tightening. 7b) is 2.5 to 3 mm at the point where the distance is narrowed, and the entire clamp is bent.
In addition, when the tightening bolts (5a, 5b) are tightened, the entire clamp is bent, so that stress is generated in the tightening bolts (5a, 5b) to suppress loosening of the tightening bolts.

FIG. 3 shows a left side view of the high pressure joint of the first embodiment.
As shown in FIG. 3, since the direction in which the fastening bolts (5a, 5b) are inserted and the connecting direction of the first joint 2a are substantially parallel, the fastening bolts (5a, 5b) and the nuts (13a, 13b) are screwed together. By doing so, the first joint 2a and the second joint 2b can be firmly fixed.

FIG. 5: shows the enlarged view of the contact part of a 1st coupling and a 1st clamp, (1) shows Example 1, (2)-(4) has shown other embodiment.
As shown in FIG. 5A, in the first embodiment, the clamp-side contact portion 6a and the joint-side contact portion 22a are provided substantially orthogonal to the abutting direction of the first joint and the second joint. However, either one or both of the clamp side contact portion and the joint side contact portion may be tapered.
For example, as shown in FIG. 5 (2), a combination of a tapered clamp side contact portion 6c and a joint side contact portion 22a may be used, or as shown in FIG. 5 (3), the clamp side contact portion 6a. And a tapered joint-side contact portion 22c. Further, as shown in FIG. 5 (4), a combination of a tapered clamp side contact portion 6c and a tapered joint side contact portion 22c may be used.

FIG. 4 shows a configuration diagram of the high-pressure joint of Example 2 after tightening.
As shown in FIG. 4, in the pipe joint 100, the through holes (8c, 8d) provided in the clamp 4c are similar to the through holes (8a, 8b) in the first embodiment, but are provided in the clamp 4d. Unlike the through holes (8a, 8b) in the first embodiment, the through holes (9c, 9d) are subjected to female screw processing. Therefore, it is possible to fix with only the fastening bolts (5a, 5b) without using the nuts (13a, 13b).
The first and second clamps (4c, 4d) may be fixed after inserting a washer having a central hole and a tooth-like pattern extending radially into the fastening bolts (5a, 5b). This is because the tooth-like pattern extending radially increases the frictional force with the clamp surface and prevents the fastening bolts (5a, 5b) from loosening.

  Even when the first and second clamps (4c, 4d) are fixed by the fastening bolts (5a, 5b), the gap 12 is provided in the second through hole, and the fastening bolts (5a, 5b) pass through. There is no escape from the holes (9c, 9d). This is because, after tightening and fixing, the male screw portion at the tip of the tightening bolt (5a, 5b) comes out of the through hole (9c, 9d) and is exposed to be damaged by contact with other members. This is to prevent (5a, 5b) from becoming difficult to remove.

  The present invention is useful as a joint for high-pressure pipes.

1,100 Pipe joint 2a 1st joint 2b 2nd joint 3 Seal ring 4 Clamp 4a, 4c, 4e 1st clamp 4b, 4d, 4f 2nd clamp 5a, 5b Clamping bolt 6a, 6b Clamp side contact part 7a, 7b Inner surfaces 8a to 8f, 9a to 9f of the tightening portion Through hole 10 Gap 11 Internal hole 12 Gap 13a, 13b Nut 21 Intermediate portion 22 End portion 22a, 22b Joint side contact portion 30a First pipe 30b Second pipe 41 Recess 50 Pipe 51 Threaded portion 52 Ground nut 54 Pipe tip 60 Joint body 61 Through hole 62 Screw hole

Claims (5)

A first joint coupled to the first object;
A second joint coupled to the second object;
A pair of clamp members that clamp and join the butted side ends of the first joint and the second joint in the butting direction;
A sealing member that maintains the sealing performance of the abutting side end;
A tightening member that narrows a gap between the pair of clamp members by a tightening operation, and presses the butted side end,
Consisting of
The first joint and the second joint are formed such that the outer diameter of the abutting side end is larger than the outer diameter of the joint middle part,
The clamp member is fitted with the abutting side end, and has a through hole and a recess formed so as to penetrate the joint intermediate part. The fastening member is a combination of at least two bolts and nuts;
A bolt hole is provided along the abutting direction of the pair of clamp members,
The bolt is inserted into the bolt hole;
The high-pressure joint structure according to claim 1. The fastening member is at least two bolts;
A bolt hole is provided along the abutting direction of the pair of clamp members,
The female screw portion is not provided on the inner wall of the bolt hole of one clamp member of the pair of clamp members, and the female screw portion is provided only on the inner wall of the bolt hole of the other clamp member. The joint structure for high pressure according to claim 1. When the abutting side ends of the first joint and the second joint abut via the seal member,
The end surfaces of the clamp members are designed so that the gap does not contact each other,
The first object and the second object are combined in a state where the gap is narrowed by the tightening operation of the tightening member, the seal member is deformed, and the clamp member is bent. The high pressure joint structure according to any one of 1 to 3. The contact surface of the said recessed part of the said clamp member and the said abutting side edge part of the coupling fitted to this recessed part is respectively substantially orthogonal to the said abutting direction, The any one of Claims 1-4 characterized by the above-mentioned. A joint structure for high pressure according to claim 1.