JP2016205566A - Non-welded flange pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-welded flange pipe joint capable of achieving high joint quality, preventing mixing of foreign matters, achieving high sealability by preventing deformation and the like of a pipe body and the like, and preventing unnecessary deformation and the like to the pipe body and the like.SOLUTION: A non-welded flange pipe joint includes a sleeve 2 surrounding each of joint pipe portions P1, a packing 3 integrally covering outer peripheral faces of the joint pipe portions, a pair of flanges 4 having through holes 4a fitted to an outer peripheral face of the sleeve, and a bolt and a nut (connection member) 51, 52 connecting the flanges through a diameter-expanded portion 23. The sleeve has locking projecting portions 21, a packing groove 22 and the diameter-expanded portion, and can be divided into two with semi-cylindrical shapes, the locking projecting portions are formed at intervals in an axial direction to be fitted to annular recessed portions P1b of the joint pipe portions, the packing groove is formed to accommodate the packing, and the diameter-expanded portion has an outer diameter larger than the through holes of the flange.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a non-welded flange pipe joint for hermetically joining pipe bodies.

  As a flange pipe joint for hermetically joining pipe bodies, for example, a welded flange pipe joint is known as a system for joining by welding. For example, as shown in FIG. 12, the welded flange pipe joint includes a pair of flanges 101 and 101 ′ for sealingly joining the pipe bodies P and P. Each flange 101, 101 ′ has a flat flange surface 101a that can be brought into close contact with each other, and has a through hole 101b orthogonal to each flange surface 101a. Each through-hole 101b, 101b is a diameter-expanded portion 101c into which the end portion of the tubular body P is inserted at a portion opposite to the flange surfaces 101a, 101a. The tubular body P is fixed to the flanges 101 and 101 ′ by welding all around in a state where the tubular body P is inserted into the enlarged diameter portion 101c.

  One flange 101 has an annular O-ring groove 101d formed coaxially with the through hole 101b on the flange surface 101a. Further, a plurality of insertion holes 101e for bolts 102 are formed in each flange 101, 101 'so as to connect these flanges 101, 101' with the flange surfaces 101a, 101a being in close contact with each other. An O-ring (not shown) provided in the O-ring groove 101d is brought into close contact with the inner surface of the O-ring groove 101d and the flange surface 101a of the other flange 101 ′, so that the flange surfaces 101a and 101a are connected to each other. It comes to be sealed.

  On the other hand, for example, each of the above-mentioned enlarged diameter portions 101c, 101c is a taper screw hole, and a taper male screw portion formed on the outer periphery of the end portion of the tubular body P is screwed into the taper screw hole via a seal tape, liquid packing, etc. There is also known a non-welded flange pipe joint (not shown) configured to integrate the pipe body P and the flanges 101 and 101 '.

  However, in the above-mentioned welded flange pipe joint, the pipes P and P are welded to the flanges 101 and 101 'all around, so that the strength and sealability of the welded part depend on the skill level of the operator performing the welding. There is a problem that a difference in quality occurs. In addition, since a large amount of heat acts on the flanges 101, 101 'and the pipe P due to the entire circumference welding, the flanges 101, 101' and the pipe P are distorted. For example, the flatness of the flange surfaces 101a, 101a There is a concern that the sealing performance between the flange surfaces 101a and 101a may be reduced due to the decrease in. In addition, when the pipes P and P are distorted, there is a possibility that unnecessary deformation or load may occur in the pipes P and P. Furthermore, since it is necessary to carry out cleaning treatment such as pickling after welding in order to prevent spatter (fine particles) from being mixed into the fluid in the flange during welding, there is a problem in that the joining cost of the pipe P is increased. There is also.

  On the other hand, in a non-welded flange pipe joint using a taper screw, a seal tape, liquid packing, or the like is required. In this case as well, depending on the skill level of the operator, the pipes P and P and the flanges 101 and 101 ' There is a problem that differences in quality such as bonding strength and sealing performance occur. In addition, the seal tape wound around the tapered male screw portion may be mixed into the fluid in the flanges 101 and 101 ′. In addition, the coupling force between the pipes P and P and the flanges 101 and 101 'varies depending on the tightening force of the taper male thread portion, and the positions of the pipes P and P change relatively greatly. There is also a problem that unnecessary deformation and load occur in P, P, and the like.

  The present invention has been made in view of the above circumstances, and can obtain a certain high quality in terms of joining strength, sealing performance, etc. regardless of the skill level of the operator, and foreign matter is mixed in the pipe body. There is no fear, and it is possible to maintain the high sealing performance by preventing the occurrence of distortion and misalignment of the pipe body, etc., and to provide a non-welded flange fitting that does not cause unnecessary deformation or load on the pipe body The challenge is to do.

  In order to solve the above problems, the invention described in claim 1 is characterized in that a portion within a predetermined range in the axial direction from the end face of a circular tube having a circular cross section provided for joining is a joining tube portion, and the joining tube portions are connected to each other. A non-welded flanged pipe joint that is hermetically joined in a coaxially arranged state, a sleeve provided so as to surround an outer peripheral surface of each joint pipe part, and an inner side of the sleeve, each joint pipe part A rubber-elastic packing that is in close contact with both outer peripheral surfaces and integrally covers both outer peripheral surfaces, a pair of flanges having a through-hole having a diameter that fits to the outer peripheral surface of the sleeve, and the pair of flanges. The sleeve is formed of a cylindrical member that is formed with a locking projection, a packing groove, and a diameter-expanded portion and that can be divided into two semi-cylindrical shapes. And the locking projection is Formed at predetermined intervals in the axial direction on the inner peripheral surface of the sleeve so as to be fitted into annular recesses formed continuously in the circumferential direction at predetermined positions in the axial direction on the outer peripheral surfaces of the respective joining pipe portions. The packing groove is formed continuously in the circumferential direction on the inner peripheral surface of the sleeve so as to accommodate the packing, and the enlarged-diameter portion is at an intermediate position in the axial direction on the outer peripheral surface of the sleeve. Each of the flanges has a diameter larger than that of the through holes of the flanges, and the flanges have the through holes on one side and the other side in the axial direction of the enlarged diameter portion on the outer peripheral surface of the sleeve. The connecting member is configured to fix the flanges to the sleeve by connecting the flanges located on the respective sides in the axial direction of the enlarged diameter portion. Specially It is set to.

  According to a second aspect of the present invention, in the first aspect of the present invention, the packing accommodated in the packing groove of the sleeve is configured such that each of the locking convex portions of the sleeve is the annular shape of the joining pipe portion. In the state of being fitted in each of the recesses, the position of the axial direction with respect to each joint pipe portion is regulated by being inserted into the reduced diameter recess portion formed on the outer peripheral surface on the end face side in each joint pipe portion. It is characterized by having.

  A third aspect of the invention is characterized in that, in the invention of the first or second aspect, the enlarged diameter portion is formed in a range covering the packing groove in the sleeve in the axial direction.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the enlarged diameter portion and the flanges are connected in a state where they are in contact with respective end faces in the axial direction of the enlarged diameter portion. The through holes of the flanges connected by the members are formed so as to be in a range that covers the locking projections in the axial direction.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the packing groove is pressed against the outer peripheral surface of each joint pipe portion with a predetermined elastic compression deformation amount. It is characterized in that it is designed to accommodate and hold the container.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the packing is a square ring packing made of rubber having a quadrangular cross section.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the sleeve is formed in a cylindrical shape by combining two semi-cylindrical portions, The semi-cylindrical portion is characterized in that the mating surface is formed in a flat shape so as to correspond to a plane passing through the axis of the sleeve.

  The invention according to an eighth aspect is the invention according to any one of the first to sixth aspects, wherein the sleeve is formed in a cylindrical shape by combining two semi-cylindrical portions, The semi-cylindrical portion is characterized in that the relative movement in at least the radial direction is restricted along the mating surfaces by fitting the irregularities formed on the mating surfaces.

  The invention according to claim 9 is characterized in that, in the invention according to any one of claims 1 to 8, the end faces of the joint pipe parts are in a state of being butted.

  A tenth aspect of the present invention is the invention according to any one of the first to eighth aspects, wherein the end surfaces of the joint pipe portions do not exceed 5/10 of the axial length of the packing. It is characterized by being in a state of being opposed to each other through a gap.

  According to an eleventh aspect of the present invention, in the invention according to the ninth or tenth aspect, on the inner peripheral side of the packing, a pressure receiving groove having a predetermined depth that opens to straddle each of the end faces is continuous in the circumferential direction. It is characterized by being formed.

  According to a twelfth aspect of the present invention, in the invention of the tenth aspect, a convex seal portion to be inserted into the gap is formed continuously in the circumferential direction on the inner peripheral side of the packing. It is a feature.

  According to the first aspect of the present invention, first, two tubes having an annular recess formed in the outer peripheral surface of the bonded tube portion are prepared, and the bonded tube portion of each tube is previously placed in the through hole of each flange. While being inserted, the packing is fitted to the outer peripheral surface of one of the joining pipe portions. In this state, after the joint pipe portions of the respective pipe bodies are arranged coaxially, the packing fitted to the outer peripheral surface of one of the joint pipe portions is evenly fitted to both the joint pipe portions. To move. Then, the sleeve divided into two is put on the outer peripheral surface of each joining pipe part, and each flange is fitted to the outer peripheral surface of the sleeve which became cylindrical by this. In this case, each flange is fitted to one side and the other side of the enlarged diameter portion. Then, the flanges are fixed to the sleeve by connecting the pair of flanges sandwiching the enlarged diameter portion with a connecting member. As a result, the sleeve is held in a cylindrical shape and the two pipe bodies are hermetically coupled.

  In other words, the cylindrical sleeve is in a state in which the engaging convex portion is fitted into the annular concave portion of each tubular body, so that the two tubular bodies are firmly connected via the sleeve. Further, since the packing is held in the packing groove, it is in close contact with the outer peripheral surfaces on both sides of each end face in each joining pipe part, so that the joining pipe parts in the two pipe bodies can be reliably sealed. .

  And in this invention, since a pair of pipes can be brought into a sealed joint state by simply assembling them in a certain procedure without using welding or taper screws, the joint strength and the strength can be increased regardless of the skill level of the worker. It is possible to connect the pipe bodies with a certain high quality with respect to sealability and the like. In addition, since no welding or taper screws are used, there is no possibility that foreign matter such as spatter and seal tape will be mixed into the fluid in the pipe. In addition, since there is no distortion due to welding or displacement of the tube due to the taper screw, the above-described high sealing performance is not impaired, and there is no possibility that unnecessary deformation or load is generated on the tube. There is an effect.

  According to the invention described in claim 2, since the packing is inserted into the reduced diameter concave portion formed on the outer peripheral surface on the end face side of each joining pipe portion, the movement in the axial direction is restricted. In the stage before the sleeve is put on the joining pipe portion, the packing can be easily provided at a regular position in the two joining pipe portions. Therefore, it is possible to shorten the work time for hermetically coupling the two pipe bodies.

  According to the third aspect of the invention, since the enlarged diameter portion is formed in a range that covers the packing groove in the sleeve in the axial direction, the rigidity of the portion of the sleeve corresponding to the packing groove can be increased. Therefore, since the packing accommodated in the packing groove can be backed up reliably, the sealing performance by the packing can be further improved.

  According to the fourth aspect of the present invention, since the diameter-expanded portion and each flange are formed so that the through hole of each flange is in a range that covers the locking convex portion in the sleeve in the axial direction. It is possible to reliably prevent the sleeve from being elastically deformed in the direction in which the diameter of the sleeve is expanded by a load acting on the locking convex portion from the annular concave portion of the body. Therefore, it is possible to improve the joining force in the axial direction of the two tubular bodies.

  According to the invention described in claim 5, since the packing groove is accommodated and held so that the packing groove is pressed against the outer peripheral surface of each joining pipe portion with a predetermined elastic compression deformation amount, the sealing performance by the packing is provided. Can be improved.

  According to the sixth aspect of the present invention, since the packing is a square ring packing having a quadrangular cross section, the packing can cover a wide range in the axial direction on the outer peripheral surface of each joining pipe portion. Therefore, the sealing performance by packing can be further improved.

  According to the invention described in claim 7, since the sleeve is formed by two semi-cylindrical portions, and the mating surface of each semi-cylindrical portion is formed in a flat shape so as to correspond to the plane passing through the axis of the sleeve. The sleeve can be easily assembled into a cylindrical shape simply by performing an operation to cover the outer peripheral surface of each joining pipe part, and in this state, each locking convex part is fitted into the annular concave part of each joining pipe part. Can do. Then, the sleeve can be held in a cylindrical shape by fitting flanges on one side and the other side of the enlarged diameter portion of the sleeve. Accordingly, it is possible to shorten the work of hermetically coupling the two pipe bodies.

  According to the invention described in claim 8, each semi-cylindrical portion is fitted with the unevenness formed on each mating surface so that relative movement in at least the radial direction is restricted along the mating surface. As a result, a force is generated in the sleeve to maintain the cylindrical shape even before the flanges are fitted. Therefore, the operation of fitting the flange to the sleeve is facilitated, so that the operation of sealingly coupling the two pipe bodies can be shortened.

  According to the ninth aspect of the present invention, since the end faces of each joining pipe portion are in a state of being abutted with each other, it is possible to improve the sealing performance of the packing closely contacting the outer peripheral surfaces on both sides of each end face. At the same time, it is possible to improve the joint strength of the tubular body particularly in the compression direction.

  According to the invention described in claim 10, since the end faces of the joining pipe portions are opposed to each other with a gap having a dimension not exceeding 5/10 of the axial length of the packing, Even if the accuracy of the axial position of the formed locking projections and annular recesses formed in the joining tube portion is low, the sleeve can be easily assembled by covering each joining tube portion. it can. Therefore, it is possible to reduce the processing cost of the sleeve and the joining pipe portion, and it is possible to shorten the assembly work time. Further, since the dimension of the gap does not exceed 5/10 of the axial length of the packing, it is possible to reliably prevent the packing from being caught in the joining pipe portion.

  According to the invention described in claim 11, the pressure receiving groove having a predetermined depth that opens to straddle the end surface of each joint pipe portion is formed continuously in the circumferential direction on the inner peripheral side of the packing. When the pressure of the fluid leaking to the outside from between the opposing end surfaces acts on the pressure receiving groove, the width of the pressure receiving groove is expanded in the axial direction. For this reason, the force by which each end surface in the axial direction of the packing presses the side surface of the packing groove or the side surface of the reduced diameter recess increases. Further, since the packing tends to be deformed so that the end portions in the axial direction swell toward the inner peripheral side and the outer peripheral side, the inner peripheral surface of the packing groove and the outer peripheral surface of the reduced diameter concave portion (there is no reduced diameter concave portion). In this case, the force for pressing the outer peripheral surface of the sleeve increases. Therefore, it is possible to reliably prevent leakage of high-pressure fluid.

  According to the twelfth aspect of the present invention, since the convex seal portion to be inserted into the gap is continuously formed in the circumferential direction on the inner peripheral side of the packing, the pressure in the tubular body is first caused by the convex seal portion. Acting on the inner peripheral surface of the inner peripheral surface, thereby elastically displacing the inner peripheral surface outward in the radial direction and elastically deforming the convex seal portion in the direction of spreading in the axial direction. For this reason, the force which each end surface of the axial direction of a convex-shaped seal part presses on the end surface of each joining pipe part will increase. Therefore, there is an effect in preventing leakage of the high-pressure fluid.

It is sectional drawing of the unwelded flange pipe joint shown as one Embodiment of this invention. It is a figure which shows the same non-welded flange pipe joint, Comprising: It is sectional drawing in the position which follows the II-II line | wire of FIG. It is a figure which shows the same non-welded flange pipe joint, Comprising: It is sectional drawing in the position which follows the III-III line of FIG. It is a figure which shows the same non-welded flange pipe joint, Comprising: It is sectional drawing which shows a sleeve and packing. It is a figure which shows the same non-welded flange pipe joint, Comprising: It is a principal part front view which shows the two pipe bodies arrange | positioned coaxially in the state which faced | matched the end surface. It is a figure which shows the same non-welded flange pipe joint, Comprising: It is sectional drawing in the position which follows the VI-VI line of FIG. It is a figure which shows the other example of the volt | bolt and nut which were shown as a connection means of a pair of flange in the non-welded flange pipe joint, Comprising: It is sectional drawing in the position corresponding to the position which follows the VI-VI line of FIG. It is a figure which shows the 1st other example of packing in the same non-welded flange pipe joint, Comprising: (a) is sectional drawing in the position corresponding to the position which follows the VI-VI line of FIG. 2, (b) It is a principal part expanded sectional view which shows the said packing and its peripheral part. It is a figure which shows the 2nd other example of packing in the non-welded flange pipe joint, and (a) is an important section expanded sectional view showing packing which has a pressure-receiving groove of V-shaped section, and its peripheral part, (B) is a principal part expanded sectional view which shows the packing which has a U-shaped pressure-receiving groove, and its peripheral part, (c) is a principal part expansion which shows the packing which has a rectangular-shaped pressure-receiving groove, and its peripheral part. It is sectional drawing. It is a figure which shows the 3rd other example of the packing in the said non-welded flange pipe joint, Comprising: (a) is the packing used in the state which provided the predetermined clearance gap between the end surfaces of each pipe body to join, and its peripheral part FIG. 4B is an enlarged cross-sectional view of a main part showing a packing having a convex seal portion to be inserted between the gaps and its peripheral part. It is a figure which shows the other example of the sleeve in the non-welded flange pipe joint, Comprising: (a) is sectional drawing in the position corresponding to the position along the XI-XI line of FIG. 4, (b) is principal part expansion. It is sectional drawing. It is a figure which shows the welding flange pipe joint shown as a prior art example, Comprising: (a) is a front view, (b) is sectional drawing in the position which follows the BB line of (a).

  An embodiment for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 to 6, the non-welded flange pipe joint 1 shown in this embodiment is predetermined in the axial direction from each end face P1a, P1a of one and the other pipes P, P used for joining. The joint pipe parts P1 and P1 are the parts in the range, and the joint pipe parts P1 and P1 are hermetically joined in a state of being coaxially arranged, and the outer peripheral surface of each joint pipe part P1 and P1 is A sleeve 2 provided so as to surround, a gasket 3 provided inside the sleeve 2 and having rubber elasticity, a pair of flanges 4 having a through-hole 4a having a diameter fitted to the outer peripheral surface of the sleeve 2, and a pair of flanges A bolt 51 and a nut 52 are provided as connecting members for holding 4 in a connected state.

  Each tubular body P has a circular cross section, and is formed such that at least the joining pipe portion P1 extends linearly. Each joining pipe part P1 is accommodated in the sleeve 2 so that its end face P1a abuts. In addition, an annular recess P1b that is continuous in the circumferential direction is formed at a predetermined position in the axial direction from the end surface P1a on the outer circumferential surface of each joint pipe portion P1, P1. The annular recess P1b is formed to have a constant width in the axial direction of the joining pipe portion P1, and is formed so as to form a recess having a rectangular cross section. In addition, the joining pipe part P1 means the part corresponding to the sleeve 2 in the pipe body P here.

  The sleeve 2 has a locking projection 21, a packing groove 22, and an enlarged diameter portion 23, and is configured by a cylindrical shape that can be divided into two semi-cylindrical shapes. That is, the sleeve 2 is formed in a cylindrical shape by combining the two semi-cylindrical portions 2a and 2a, and the inner peripheral surface thereof has a diameter that can be accurately fitted to the outer peripheral surface of the joining pipe portion P1. Is formed. Each semi-cylindrical portion 2 a is formed in a planar shape so that the mating surface thereof is in a position and direction corresponding to a plane passing through the axis of the sleeve 2.

  The locking projections 21 are formed at predetermined intervals in the axial direction on the inner peripheral surface of the sleeve 2 so as to fit into the annular recesses P1b of the joining pipe portions P1 and P1 in a state where the end surfaces P1a are abutted with each other. Has been. In this case, each locking projection 21 is located at a position equally distributed from the center in the axial direction of the sleeve 2 to the left and right in the axial direction, and is continuously formed in the circumferential direction on the inner peripheral surface of the sleeve 2. In addition, the sleeve 2 is formed to have a constant width in the axial direction, and the cross section is formed in a quadrangular shape so as to be fitted into the annular recess P1b.

  The packing 3 is a nitrile rubber formed into a flat rectangular shape (flat rectangular shape) having a long cross section in the axial direction so as to be in close contact with both outer peripheral surfaces of the joint pipe portions P1 and P1 and to integrally cover both the outer peripheral surfaces. A square ring packing made of rubber (made of rubber) is used.

  The packing groove 22 accommodates the packing 3 so that the packing 3 can cover a portion of the outer peripheral surface of each joining pipe portion P1, P1 that is in an equal range in the axial direction from each end face P1a. ing. The packing groove 22 is continuously formed in the circumferential direction with a constant width equally distributed from the center in the axial direction on the inner peripheral surface of the sleeve 2 to the left and right in the axial direction, and the cross section of the packing groove 22 is the packing P. In order to be able to be accommodated, it is formed in a flat rectangular concave shape that is long in the axial direction. The packing groove 22 has a dimension in the depth direction or the like so that the packing 3 is pressed against the outer peripheral surface of each joint pipe portion P1, P1 with a predetermined elastic compression deformation amount.

  The enlarged diameter portion 23 is at an intermediate position in the axial direction on the outer peripheral surface of the sleeve 2, and has an outer diameter larger than the through hole 4 a of each flange 4. In this case, the enlarged-diameter portion 23 is formed to have a constant width that is equally distributed from the axial center of the sleeve 2 to the left and right in the axial direction.

  The pair of flanges 4, 4 are fitted to the outer peripheral surfaces of one side and the other side in the axial direction of the enlarged diameter portion 23 in the sleeve 2, respectively, through the through holes 4 a. In this case, the diameter of the through-hole 4 a is set so as to be accurately fitted to the outer peripheral surface of the sleeve 2. Each of the flanges 4 and 4 is formed of a thick square plate, a through hole 4a is formed at the center of the square, and a bolt 51 is inserted into a portion corresponding to each of the four corners. A hole 4b (see FIG. 6) is formed.

  The bolts 51 and the nuts 52 are attached to the flanges 4 and 4 fitted to the respective sides in the axial direction of the enlarged diameter portion 23 of the sleeve 2, thereby attracting the flanges 4 to the sleeve. 2 is fixed. That is, after inserting the bolt 51 into each of the four insertion holes 4 b in each flange 4, 4, the nut 52 is screwed into the threaded portion of the bolt 51 and tightened, whereby the flange 4, 4 is attached to the sleeve 2. The flanges 4 and 4 are fixed to prevent the flanges 4 and 4 from falling off the sleeve 2.

  The enlarged diameter portion 23 is formed in a range that covers the packing groove 22 in the sleeve 2 in the axial direction. And this through-hole 4a of each flange 4 connected with the bolt 51 and the nut 52 in the state which contact | abutted each end surface of the axial direction of this enlarged diameter part 23 and each flange 4 is the latching convex part 21. It is formed so that it may become the range which covers an axial direction.

  As for the sleeve 2, the flanges 4, 4, the bolts 51, and the nuts 52, when the pipe body P is formed of a metal, those formed of a metal such as copper, brass, or steel corresponding to the metal are used. It is preferable. Further, when the tube P is made of plastic, the above-described metal or plastic sleeve 2, flanges 4, 4, bolts 51, and nuts 52 can be used.

  In the non-welded flanged pipe joint 1 configured as described above, first, two pipes P and P in which an annular recess P1b is formed on the outer peripheral surface of the joint pipe parts P1 and P1 are prepared. And the joining pipe parts P1 and P1 of each pipe P and P are inserted in the through-hole 4a of each flange 4. Moreover, the packing 3 is fitted to the outer peripheral surface of one joining pipe part P1. In this state, the bonding pipe portions P1 and P1 of the pipe bodies P and P are coaxially arranged and the end faces P1a and P1a are abutted, and then the packing 3 fitted to one of the bonding pipe portions P1 is attached. It moves from each end face P1a in each joining pipe part P1 to an equal position in the axial direction. Thereafter, the outer peripheral surface of each joint pipe portion P1, P1 is covered with a semi-cylindrical portion 2a, 2a as a sleeve 2, and a flange is formed on each side of the enlarged diameter portion 23 on the outer peripheral surface of the cylindrical sleeve 2. 4 and 4 are fitted. And the two flanges 4 and 4 in the position which pinched | interposed the diameter expansion part 23 are connected with the volt | bolt 51 and the nut 52. FIG. As a result, the flanges 4 and 4 are fixed to the sleeve 2, the sleeve 2 is held in a cylindrical shape, and the two pipe bodies P and P are hermetically coupled. Become.

  That is, the cylindrical sleeve 2 is in a state in which the locking projection 21 is fitted in the annular recess P1b of each tube P, P, so that each tube P, P is firmly connected. become. Further, since the packing 3 is held in the packing groove 22 and is in close contact with the outer peripheral surface of each joining pipe portion P1, P1 with a predetermined amount of elastic compression deformation, the joining pipe portion in each tubular body P, P P1 and P1 can be reliably sealed.

  And in this non-welded flange pipe joint 1, since a pair of pipes P and P can be made into a sealing joined state only by assembling in a fixed procedure, without using welding or a taper screw, the skill level of an operator Regardless of the case, it is possible to connect the pipes P and P with a certain high quality with respect to the joining strength, the sealing performance, and the like. In addition, since no welding or taper screws are used, there is no possibility that foreign matter such as spatter and seal tape will be mixed into the pipes P and P. In addition, since distortion due to welding and misalignment of the pipes P and P due to taper screws can be prevented, fluid leakage due to such distortions and unnecessary deformation and load on the pipes P and P are prevented. can do.

  In addition, since the end faces P1a of the joint pipe portions P1 and P1 are in contact with each other, it is possible to improve the sealing performance by the packing 3, and particularly to improve the joint strength in the compression direction. it can.

  Further, since the enlarged diameter portion 23 is formed at a portion corresponding to the packing groove 22 in the sleeve 2, the rigidity of the portion corresponding to the packing groove 22 in the sleeve 2 can be increased. Therefore, a larger amount of elastic compression deformation can be applied to the packing 3 accommodated in the packing groove 22 and pressed against the outer peripheral surface of each joint pipe portion P1, P1, so that the sealing performance by the packing 3 can be improved. You can plan.

  Moreover, since the enlarged diameter part 23 and each flange 4 are formed so that the inner peripheral surface of the through-hole 4a of each flange 4 may become a site | part corresponding to the latching convex part 21 in the sleeve 2, for example, each pipe body It is possible to reliably prevent the sleeve 2 from being elastically deformed in the direction in which the diameter of the sleeve 2 expands due to a load acting on the locking projection 21 from the annular recess P1b of P and P. That is, it is possible to improve the bonding force between the pipes P and P.

  In addition, since the packing 3 is formed by a square ring packing having a flat rectangular cross section that is long in the axial direction, the packing 3 can cover a wide range on the outer peripheral surface of each joining pipe portion P1, P1. Therefore, the sealing performance by the packing 3 can be further improved.

  On the other hand, since the sleeve 2 is formed by two semi-cylindrical portions 2a, and the mating surface of each semi-cylindrical portion 2a is formed in a planar shape corresponding to the plane passing through the axis of the sleeve 2, the sleeve 2 is The sleeve 2 can be easily assembled into a cylindrical shape simply by performing the operation of covering the outer peripheral surfaces of the joint pipe portions P1 and P1, and in this state, the locking projections 21 are connected to the joint pipe portions P1 and P1. It can be fitted into the annular recess P1b. Then, the sleeve 2 can be held in a cylindrical shape by fitting the flange 4 to one side and the other side of the enlarged diameter portion 23 in the sleeve 2. Therefore, it is possible to shorten the sealing and joining work of the two pipe bodies P.

  In the above-described embodiment, the packing 3 is configured to be pressed against the outer peripheral surface of each joining pipe portion P1, P1 with a predetermined elastic compression deformation amount. When the pressure of the fluid in P is low, it may be provided so as to be in close contact with the outer peripheral surfaces of the joining pipe portions P1 and P1.

  Further, as shown in FIG. 7, the insertion hole 4b of the bolt 51 in one flange 4 may be a screw hole 4c into which the screw portion of the bolt 51 can be screwed. In this case, the nut 52 is not necessary, and the number of parts can be reduced.

  Further, as shown in FIGS. 8 (a) and 8 (b), the packing 3 has a reduced diameter recess P1c formed on the outer peripheral surface on the end face P1a side of each joining pipe portion P1, P1 in the packing 3 You may make it fit in the predetermined position of each joining pipe part P1 and P1 by inserting the part of the circumference side. In this case, the position of the packing 3 is regulated by the reduced diameter concave portion P1c formed on the basis of the following conditions in relation to the positions of the packing groove 22, the locking convex portion 21, and the annular concave portion P1b. . That is, the packing 3 accommodated in the packing groove 22 of the sleeve 2 is connected to each of the joints in a state in which the respective locking projections 21 of the sleeve 2 are fitted in the annular recesses P1b of the joint pipe portions P1 and P1. The tube portions P1 and P1 are inserted into reduced diameter concave portions P1c formed on the outer peripheral surface on the end surface P1a side, and the axial positions with respect to the respective joint tube portions P1 and P1 are regulated.

  According to said structure, since the packing 3 is inserted in the diameter-reduction recessed part P1c formed in the outer peripheral surface by the side of the end surface P1a of each joining pipe part P1 and P1, the movement of an axial direction is restrict | limited. In the stage before the sleeve 2 is put on the joining pipe portions P1 and P1, the packing 3 can be easily installed at the regular positions in the joining pipe portions P1 and P1. Accordingly, it is possible to shorten the work time for hermetically coupling the two pipe bodies P together.

  Further, as shown in FIG. 9, the packing 3 has a pressure receiving groove 3 a having a predetermined depth that opens across the end faces P <b> 1 a and P <b> 1 a and is continuously formed in the circumferential direction of the inner peripheral surface. May be. FIG. 9A shows an example of the pressure receiving groove 3a that opens so as to open in a V-shaped cross section toward the inner peripheral surface. FIG. 9B shows an example of a pressure receiving groove 3a that is formed in a U-shaped cross section and opens on the inner peripheral surface at a predetermined interval. Further, FIG. 9C shows an example of a pressure receiving groove 3a which is formed in a rectangular cross section (a rectangular shape whose cross section is long in the direction toward the inner peripheral surface) and which opens at a predetermined interval on the inner peripheral surface. Moreover, about the pressure receiving groove 3a, it is possible to employ | adopt the thing of various cross-sectional shapes other than the above.

  According to the above configuration, the pressure receiving groove 3a having a predetermined depth that is open to straddle the end faces P1a and P1a of the joint pipe portions P1 and P1 is continuously formed in the circumferential direction on the inner peripheral side of the packing 3. Therefore, when the pressure of the fluid leaked to the outside from between the end faces P1a and P1a acts on the pressure receiving groove 3a, the pressure receiving groove 3a is elastically deformed so that the width of the pressure receiving groove 3a expands in the axial direction. For this reason, the force which each end surface of the axial direction of the packing 3 presses the side surface of the packing groove | channel 22 and the side surface of the diameter-reduced recessed part P1c increases. Further, since the packing 3 tends to be deformed so that the end portions in the axial direction swell toward the inner peripheral side and the outer peripheral side, a force pressing the inner peripheral surface of the packing groove 22 and the outer peripheral surface of the reduced diameter concave portion P1c is generated. Increase. Therefore, it is possible to reliably prevent leakage of high-pressure fluid. FIG. 9 shows an example in which each joint pipe portion P1, P1 has a diameter-reduced recess P1c, but pressure is applied to the joint pipe portions P1, P1 that do not have the diameter-reduced recess P1c. You may apply the packing 3 which has the groove | channel 3a. Also in this case, the packing 3 has an increased force for pressing the outer peripheral surfaces of the joining pipe portions P1, P1, so that the sealing performance can be improved.

  Moreover, in the said embodiment, although the example connected in the state which faced | matched each end surface P1a of each joining pipe part P1 and P1, the end surfaces P1 and P1 of each this joining pipe part P1 and P1 are shown in FIG. As shown, the packing 3 may be configured to face each other with a gap G having a dimension not exceeding 5/10 of the axial length.

  In this case, as shown in FIG. 10A, the packing 3 may simply have a shape that fits in the packing groove 22 and the reduced diameter recess P1c. In addition, when there is no reduced diameter recessed part P1c, the thing of the shape which only fits in the packing groove | channel 22 may be sufficient. However, as for the packing 3, as shown in FIG. 10B, it is preferable that the convex seal portion 3b inserted into the gap G is formed continuously in the circumferential direction of the inner peripheral surface. In this case, it is preferable that the convex seal portion 3b is formed to have such a dimension that the end face in the axial direction is in close contact with the end face P1a of each joint pipe portion P1, P1.

  According to the above configuration, the end faces P1a of the joint pipe portions P1 and P1 are opposed to each other with the gap G having a dimension not exceeding 5/10 of the axial length of the packing 3. Even when the dimensional accuracy regarding the position in the axial direction of the locking convex portion 21 formed in 2 and the annular concave portion P1b formed in the joining pipe portions P1 and P1 is set low, the sleeve 2 is It can be easily assembled so as to cover the joining pipe portions P1 and P1. Therefore, it is possible to reduce the cost associated with the reduction in processing accuracy of the sleeve 2 and the joining pipe portions P1 and P1, and it is possible to reduce the working time associated with the simplification of the assembly work. Moreover, since the dimension of the gap G does not exceed 5/10 of the axial length of the packing 3, it is possible to reliably prevent the packing 3 from being caught in the joining pipe portions P1 and P1. Note that the packing 3 having the pressure receiving groove 3a shown in FIG. 9 may be applied to the joining pipe portions P1 and P1 having the gap G. In addition, it is more preferable that the gap G is set to a dimension that does not exceed 1/3 of the axial length of the packing 3 in order to stably hold the packing 3.

  On the other hand, since the convex seal part 3b inserted into the gap G is formed continuously in the circumferential direction on the packing 3, the pressure in the tube P first acts on the inner peripheral surface of the convex seal part 3b. As a result, the inner peripheral surface is elastically displaced outward in the radial direction, and the convex seal portion 3b is elastically deformed in a direction spreading in the axial direction. For this reason, the force which each end surface of the axial direction of the convex-shaped seal | sticker part 3b presses on the end surface P1a of each joining pipe part P1 and P1 increases. Therefore, there is an effect in preventing leakage of the high-pressure fluid.

  In the above embodiment, the sleeve 2 is composed of two semi-cylindrical portions 2a having a flat mating surface. However, as the sleeve 2, as shown in FIG. The semi-cylindrical portion 2aa and the other semi-cylindrical portion 2ab are combined to form a cylindrical shape, and the semi-cylindrical portions 2aa and 2ab are fitted with the irregularities formed on their mating surfaces. Thus, the relative movement in the radial direction may be limited. In this example, the mating surface of one semi-cylindrical portion 2aa is a male mating surface 2A, the mating surface of the other semi-cylindrical portion 2ab is a female mating surface 2B, and these mating surfaces 2A and 2B are accurately fitted to each other. Is set to

  Here, the male mating surface 2A has a first horizontal surface 2A1, a vertical surface 2A2, and a second horizontal surface 2A3, and the female mating surface 2B includes the first horizontal surface 2B1, the vertical surface 2B2, The second horizontal plane 2B3 is included. The vertical surfaces 2A2 and 2B2 are planes in the direction perpendicular to the plane C passing through the axis of the sleeve 2 at the center position in the thickness direction of the cylindrical portion excluding the locking convex portion 21 and the enlarged diameter portion 23 in the sleeve 2. It is formed by. The first horizontal planes 2A1 and 2B1 and the second horizontal planes 2A3 and 2B3 are formed on one side and the other side of the plane C, respectively. In this case, the first horizontal planes 2A1 and 2B1 are formed in parallel to the plane C so as to reach the vertical planes 2A2 and 2B2 from the inside of the sleeve 2. The second horizontal planes 2A3 and 2B3 are formed in parallel to the plane C so as to reach the vertical planes 2A2 and 2B2 from the outside of the sleeve 2.

  For example, the first horizontal surface 2A1 and the vertical surface 2A2 form a convex, and the first horizontal surface 2B1 and the vertical surface 2B2 form a concave. By fitting these concaves and convexes, in the radial direction of the semi-cylindrical portions 2aa and 2ab The relative movement of is prevented.

  According to the above configuration, by restricting the relative movement in the radial direction of the semi-cylindrical portions 2aa and 2ab, a force for maintaining the sleeve 2 in a cylindrical shape is generated even before the flanges 4 are fitted. Become. Accordingly, since the operation of fitting the flange 4 to the sleeve 2 becomes easier, the sealing and connecting operation of the pipe bodies P and P can be shortened. In addition, you may make it further form the unevenness | corrugation which restrict | limits that semi-cylindrical part 2aa and 2ab move relatively to an axial direction in the mating surfaces 2A and 2B.

DESCRIPTION OF SYMBOLS 1 Non-weld flange pipe joint 2 Sleeve 2a Semi-cylindrical part 2aa One semi-cylindrical part 2ab The other semi-cylindrical part 2A, 2B Mating surface 3 Packing 3a Pressure receiving groove 3b Convex seal part 4 Flange 4a Through-hole 21 Locking convex part 22 Packing groove 23 Expanded diameter part 51 Bolt (connecting member)
52 Nut (connecting member)
P pipe body P1 joint pipe portion P1a end face P1b annular recess P1c reduced diameter recess

Claims (12)

This is a non-welded flanged pipe joint that seals and joins a portion of a predetermined range in the axial direction from the end face of the tubular body having a circular cross section used for joining in a state in which the joining tube portions are arranged coaxially. There,
A sleeve provided so as to surround the outer peripheral surface of each joint pipe part;
A packing having rubber elasticity which is inside the sleeve and is in close contact with both outer peripheral surfaces of each joining pipe portion and integrally covers both outer peripheral surfaces;
A pair of flanges having a through-hole with a diameter that fits to the outer peripheral surface of the sleeve;
A connecting member for holding the pair of flanges in a state of being connected to each other;
The sleeve is formed of a cylindrical shape in which a locking convex portion, a packing groove and an enlarged diameter portion are formed and can be divided into two semi-cylindrical shapes,
The locking projections are axially formed on the inner peripheral surface of the sleeve so as to fit into annular recesses formed continuously in the circumferential direction at predetermined positions in the axial direction on the outer peripheral surfaces of the joint pipe portions. It is formed at a predetermined interval,
The packing groove is formed continuously in the circumferential direction on the inner peripheral surface of the sleeve to accommodate the packing,
The diameter-expanded portion is at an intermediate position in the axial direction on the outer peripheral surface of the sleeve, and the outer diameter is formed larger than the through-hole of each flange,
Each flange is adapted to be fitted to one side and the other side in the axial direction of the enlarged diameter portion on the outer peripheral surface of the sleeve via the through hole,
The connection member is configured to fix the flanges to the sleeve by connecting the flanges located on the respective sides in the axial direction of the enlarged diameter portion. .   The packing housed in the packing groove of the sleeve has the end face in each joint pipe portion in a state in which each of the locking convex portions in the sleeve is fitted in each of the annular concave portions of the joint pipe portions. 2. The non-welded flanged pipe joint according to claim 1, wherein the welded flange pipe joint is inserted into a reduced diameter concave portion formed on the outer peripheral surface of the side and the position in the axial direction with respect to each joint pipe portion is regulated. .   3. The non-welded flange pipe joint according to claim 1, wherein the enlarged-diameter portion is formed in a range that covers the packing groove in the sleeve in the axial direction.   A range in which the through-holes of the flanges connected by the connecting member cover the locking projections in the axial direction in a state where the enlarged diameter portions and the flanges are in contact with the end surfaces in the axial direction of the enlarged diameter portion. The non-welded flange pipe joint according to any one of claims 1 to 3, wherein the non-welded flange pipe joint is formed so as to become.   5. The packing groove according to any one of claims 1 to 4, wherein the packing groove is configured to receive and hold the packing so as to press against the outer peripheral surface of each joint pipe portion with a predetermined elastic compression deformation amount. Non-welded flange fittings described in 1.   The non-welded flange pipe joint according to any one of claims 1 to 5, wherein the packing is a square ring packing made of rubber having a quadrangular cross section. The sleeve is formed in a cylindrical shape by combining two semi-cylindrical parts,
The non-welded flange pipe according to any one of claims 1 to 6, wherein each of the semi-cylindrical portions is formed in a flat shape so that a mating surface thereof corresponds to a plane passing through the axis of the sleeve. Fittings. The sleeve is formed in a cylindrical shape by combining two semi-cylindrical parts,
The semi-cylindrical portions are configured such that the relative movement in at least the radial direction is restricted along the mating surfaces by fitting the irregularities formed on the mating surfaces. The non-welded flange pipe joint according to any one of Items 1 to 6.   The non-welded flange pipe joint according to any one of claims 1 to 8, wherein the end faces of each joint pipe part are in a state of being abutted with each other.   The end faces of the joint pipe portions are in a state of being opposed to each other with a gap having a dimension not exceeding 5/10 of the axial length of the packing. The unwelded flange pipe joint according to any one of the above.   The pressure-receiving groove having a predetermined depth that opens so as to straddle each of the end faces is formed continuously in the circumferential direction on the inner peripheral side of the packing. Welded flange fittings.   11. The non-welded flange joint according to claim 10, wherein a convex seal portion inserted into the gap is continuously formed in a circumferential direction on an inner peripheral side of the packing.

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