JP6914302B2 - Pipe fitting - Google Patents

Description

The present invention relates to a pipe joint in which an insertion port of a fluid pipe is inserted into a receiving port of the fluid pipe and hermetically connected.

Patent Document 1 describes a flange formed at a receiving port of a fluid pipe, a tapered surface formed on the inner circumference of an opening of the flange, and a seal inserted between the outer peripheral surface of the insertion port and the tapered surface. A member, a convex portion formed on the outer peripheral surface of the insertion slot, a split push ring mounted on the convex portion, and a fastening member for fastening the flange and the split push ring are provided, and the outer periphery of the insertion slot is provided. A pipe joint that is sealed and connected by a sealing member inserted between the surface and the tapered surface is disclosed.

Japanese Patent No. 5192979 (pages 5 and 6, FIG. 1)

However, in Patent Document 1, since the split push ring engaged with the convex portion has a two-split structure, the rigidity of the split push ring is lowered, and the wall thickness of the mating surface of the split push ring is also integrally configured. It will be about half that of the push ring.

In addition, tensile force, compressive force, and vibration load from a vehicle running on the ground repeatedly act on the pipe joint due to an earthquake, uneven settlement, and the like. Such tensile force, compressive force, and vibration load are held by the split push ring engaged with the convex portion and the flange fastened by the bolt. However, when tensile force, compressive force, and vibration load act on the split push ring, the push ring is split, so that the seal member cannot be pressed uniformly, the proper compressive force cannot be maintained, and the sealed state cannot be maintained. There's a problem.

The present invention has been made by paying attention to such a problem, and provides a pipe joint capable of ensuring long-term reliability even when a force or vibration load caused by an earthquake, uneven settlement, etc. is applied. The purpose.

In order to solve the above problems, the pipe joint of the present invention is used.
A flange formed in the receiving port, a tapered surface formed on the inner circumference of the opening of the flange, a sealing member inserted between the outer peripheral surface of the insertion port and the tapered surface, and a pipe shaft rather than the sealing member. The insertion port of the fluid tube at the receiving port of the fluid tube provided with the convex portion formed on the outer peripheral surface of the insertion port on the rear side in the direction, the push ring, and the fastening member for fastening the flange and the push ring. It is a pipe joint that is sealed and connected by inserting a flange, and is engaged with the convex portion in both directions in the pipe axis direction, and the outer diameter dimension at the time of engagement is larger than the inner diameter dimension of the push ring and presses the seal member. It has a locking member having a contact surface, and the push ring is integrally formed in an annular shape, and the inner diameter dimension thereof is larger than the outer diameter dimension of the convex portion.
According to this feature, since the locking member is integrally fastened between the integrally formed push ring and the flange, the locking member can uniformly press the sealing member, maintain an appropriate compressive force, and seal the pipe joint. You can keep the state.

The pipe fitting of the present invention
The inner diameter of the push ring is smaller than the outer diameter of the seal member.
According to this feature, since the inner diameter of the push ring is limited to be smaller than the outer diameter of the seal member, a region where the integrated push ring presses the seal member can be formed, so that the locking member makes the seal member uniform. It can be pressed against, the proper compressive force can be maintained, and the pipe joint can be kept sealed.

The pipe fitting of the present invention
The locking member is characterized by including a fixing means for preventing movement with respect to the convex portion.
According to this feature, since the locking member can prevent the movement with respect to the convex portion, the change in the force with which the locking member presses the seal member can be reduced, and the force with which the locking member presses the seal member can be stabilized.

(A) is a plan sectional view showing a pipe joint in Example 1, and (b) is a sectional view taken along the line HH of (a). It is a partial cross-sectional view explaining the assembly of the pipe joint in Example 1. FIG. (A) to (d) are diagrams showing a modified example of the seal member mounting structure in the first embodiment. It is a top view which shows the modification of the combination of pipe joints in Example 1. FIG. FIG. 5 is a plan sectional view showing another modification of the combination of pipe joints in the first embodiment. It is a partial cross-sectional view which shows still another modification of the combination of pipe joints in Example 1. FIG. (A) is a partial cross-sectional view for explaining the assembly of the pipe joint in the second embodiment, and (b) is a plan cross-sectional view showing the pipe joint of (a). It is a top view which shows the modification of the pipe joint in Example 2. FIG. (A) is a plan sectional view showing a pipe joint in Example 3, and (b) is a JJ sectional view of (a). (A) is a plan sectional view showing a pipe joint in Example 4, and (b) is a KK sectional view of (a). (A) is a vertical cross-sectional view for explaining the assembly of the pipe joint in the fourth embodiment, and (b) is a vertical cross-sectional view for explaining the attachment of the fixing member.

A mode for carrying out the pipe joint according to the present invention will be described below based on examples.

The pipe joint according to the first embodiment will be described with reference to FIGS. 1 to 2. First, reference numeral 1 in FIG. 1A is a pipe joint to which the present invention is applied. In this embodiment, the fluid in the fluid pipe is clean water, but the fluid flowing inside the fluid pipe is not necessarily clean water, for example, industrial water, agricultural water, sewage, etc., as well as gas, gas, and liquid. It may be a gas-liquid mixture of.

As shown in FIG. 1 (b), an annular flange 3 projecting outward in the radial direction is integrally formed on the end surface side of the receiving port 2 of the fluid pipe P1, and is connected to the end surface 3a of the flange 3 and gradually contracts. A tapered surface 4 having a diameter, a large-diameter inner peripheral surface 5 connected to the tapered surface 4, an annular surface 6 connected to the large-diameter inner peripheral surface 5 and having a pipe axis as a central axis, and a small-diameter inner peripheral surface 7 connected to the annular surface 6. , And an annular seal member 12 is inserted in the space between the tapered surface 4 and the outer peripheral surface 11 of the insertion port 10 of the bent fluid pipe P2.

As shown in FIG. 1A, an annular convex portion 13 as a convex portion of the present invention is formed on the outer peripheral surface 11 of the insertion port 10. Further, as shown in FIG. 2, the push ring 16 is integrally molded in an annular shape, the inner diameter dimension D1 thereof is larger than the outer diameter dimension D2 of the annular convex portion 13, and the inner diameter portion of the push ring 16 is the insertion port 10 and the annular convex portion. It is possible to play around the outer circumference of the portion 13.

As shown in FIG. 2, the locking member 14 is divided in the circumferential direction, and grooves 14c are formed in the inner peripheral portions of the divided pieces 14a and 14b. The groove 14c can be engaged with the annular convex portion 13 from the outer side in the radial direction of the insertion port 10, and the outer diameter dimension of the locking member 14 at the time of engagement is formed to be larger than the inner diameter dimension D1 of the push ring 16. Therefore, when the locking member 14 is engaged with the annular convex portion 13 in a state where the push ring 16 is idled on the bent side of the bent pipe P2 with respect to the annular convex portion 13, the contact surface 16a of the integrated push ring 16 becomes the locking member. The locking member 14 can be supported by the integrated push ring 16 so that the contact surface 14e can be brought into contact with the surface.

As shown in FIG. 2, a plurality of holes 14d are formed in the locking member 14, and screw holes 13a are formed in the annular convex portion 13 at positions corresponding to the holes 14d in the radial direction. A groove 14c formed in the inner peripheral portion of each of the divided pieces 14a and 14b is engaged with the annular convex portion 13, and the divided pieces 14a and 14b and the annular convex portion 13 can be fixed by a fixing means 15 such as a screw. It has become. As the fixing means, it is sufficient that the movements of the divided pieces 14a and 14b and the annular convex portion 13 in the radial direction and the circumferential direction can be fixed. can do.

Here, the convex portion of the present invention may be continuous over the circumferential direction like the annular convex portion 13 of the present embodiment, but a plurality of cuts may be provided or intermittently in a part of the circumferential direction. A notch may be provided.

Hereinafter, an assembly procedure in the case of connecting the receiving port 2 of the fluid pipe P1 and the insertion port 10 of the bent fluid pipe P2 will be described with reference to FIGS. 1 and 2.

As a procedure (1), as shown in FIG. 2, the push ring 16 is idled with respect to the insertion port 10 in advance at the factory, and the divided pieces 14a and 14b of the locking member 14 are engaged with the annular convex portion 13. Then, it is fixed by a fixing means 15 such as a screw. In this way, by performing the work previously performed at the construction site in advance at the factory, it is possible to reduce the work time at the construction site and the burden on the worker.

As a procedure (2), at the construction site, the seal member 12 is externally inserted into the outer peripheral surface 11 of the insertion port 10, and then the insertion port 10 is inserted into the receiving port 2 from the pipe axis X direction. If necessary, a lubricant may be used.

As step (3), the bolt 17a of the fastening means 17 is inserted into the bolt insertion hole of the push ring 16 and the bolt insertion hole of the flange 3 of the receiving port 2, and the nut 17b screwed into the tip of the bolt 17a is tightened. The contact surface 16a of the push ring 16 and the contact surface 14e of the locking member 14 are brought into contact with each other, and the receiving port 2 and the insertion port 10 are relatively pulled and moved in the pipe axis direction, and are sealed by the contact surface 14g of the locking member 14. The material 12 is pressed and compressed while being pushed between the tapered surface 4 of the receiving port 2 and the outer peripheral surface 11 of the insertion port 10.

As step (4), tightening is performed until the push ring 16, the locking member 14, and the end surface 3a of the flange 3 of the receiving port 2 come into contact with each other. Usually, the tightening management of the fastening member 17 is performed by managing the tightening torque. However, in the pipe joint of the first embodiment, when the push ring 16, the locking member, and the end surface 3a of the flange 3 come into contact with each other, the tightening torque suddenly increases, so that the tightening feel does not need to be tightened by torque management. You can easily judge the completion of tightening with. It is also possible to visually confirm that the push ring 16, the locking member, and the end surface 3a of the flange 3 are in contact with each other.

Hereinafter, the action and effect of Example 1 will be described. In a state where the push ring 16, the locking member, and the end surface 3a of the flange 3 are in contact with each other to complete the tightening, the insertion port 10 is in a state of being inserted with the connection length set for the receiving port 2, and is annularly convex. Since the locking member 14 engaged with the portion 13 is sandwiched between the push ring 16 and the end surface 3a of the flange 3 of the receiving port 2, it is possible to prevent the tip end portion of the insertion port 10 from coming into contact with the receiving port 2. .. Therefore, since the tip portion 10 of the insertion port does not accidentally come into contact with the receiving port 2 during construction, damage such as peeling of paint or the like can be prevented.

In a state where the push ring 16 is tightened until the locking member 14 and the end surface 3a of the flange 3 come into contact with each other, the tapered inner peripheral surface 4 of the receiving port 2, the large-diameter inner peripheral surface 5, the annular surface 6, and the outer periphery of the insertion port 10 are tightened. The mounting space of the seal member 12 formed by the surface 11 and the contact surface 14 g of the locking member 14 is sized so that the seal member 12 can exhibit an appropriate sealed state. Therefore, if the push ring 16 is tightened so that the locking member and the end surface 3a of the flange 3 are in contact with each other and the seal member 12 is pushed into this mounting space, the seal member 12 is automatically in an appropriate compressed state and is stably sealed for a long period of time. It becomes a state where the state can be maintained.

A force due to an earthquake, a tensile force due to unequal subsidence, a compressive force, or a vibration load from a vehicle running on the ground repeatedly acts on the pipe joint. Such tensile force, compressive force, and vibration load are held by the locking member engaged with the annular convex portion 13, the push ring 16, and the flange 3 fastened by the fastening means 17. In the first embodiment, the divided locking member 14 is fastened and sandwiched between the integrally molded push ring 16 and the flange 3 by the fastening means 17, so that tensile force, compressive force, and vibration load act on it. However, since the locking member 14 can uniformly press the seal member, an appropriate compressive force can be maintained.

Since the inner diameter dimension D1 of the push ring 16 is limited to be smaller than the outer diameter dimension of the seal member 12, there are a region where the locking member 14 presses the seal member 12 and a region where the push ring 16 presses the seal member 14. However, the tightening force at the time of tightening the fastening member 17 is surely transmitted to the pressing region. Even after that, the locking member can uniformly press the seal member, and the fastening member 17 can maintain a stable sealed state.

Since the grooves 14c of the divided pieces 14a and 14b of the locking member 14 are engaged with the annular convex portion 13 formed integrally with the insertion port 10, and further fixed to the annular convex portion 13 by the fixing means 15. , The annular member 13 and the locking member 14 are constrained to move in the radial direction and the circumferential direction of each other. Further, since the locking member 14 is fastened and sandwiched between the flange 3 and the push ring 16 by the fastening means 17, even if the locking member 14 is divided, the locking member 14 is concentrated on the seal member 12 at the joint. The load can be reduced and the sealed state can be maintained for a long period of time.

Further, the locking member 14 is engaged with the annular convex portion 13 integrally formed with the insertion port, and the locking member 14 is further tightened and sandwiched between the flange 3 and the push ring 16 by the fastening means 17. Even if a tensile force or a compressive force caused by an earthquake or uneven settlement acts on the locking member 14, the locking member 14, the integrally molded flange 3 and the push ring 16 sandwich the locking member 14, so that the socket 2 is inserted through the socket 2. Can be prevented from coming off or the tip of the insertion port 10 from coming into contact with the receiving port 2.

As described above, in the pipe joint of the first embodiment, the locking member can uniformly press the seal member, an appropriate compressive force can be maintained, and the pipe joint can be kept in a sealed state.

FIG. 3 shows a modified example of the mounting structure of the seal member 12. FIG. 3A shows an escape area 12a for the seal 12 provided in the seal mounting space. By providing a relief area for the seal 12, the pressing force of the seal can be adjusted when the seal is pressed excessively. The size of the escape area of the seal can be determined by the characteristics of the material of the seal and the pressing force of the seal. It can be made as small as. Further, as shown in FIG. 3C, the seal pressing surface 14g of the locking member 14 can be made flat or curved without providing an escape place for the seal.

FIG. 3D shows a liner 19 supporting the surface of the sealing member 12 in contact with the annular surface 6. By supporting the seal member 12 with the liner 19, it is possible to prevent the seal member 12 from sticking out, improve the durability against a force in the bending direction, and further reduce the impact force.

In the first embodiment of FIG. 1, the insertion holes 10 formed at both ends of the bent fluid pipe P2 are connected by the pipe joint 1 of the first embodiment, but as shown in FIGS. 4 to 6, different types of pipe joints are connected. Can also be used, and the range of application to seismic pipes can be expanded. However, the different types of pipe joints are not limited to this, and for example, an insertion port may be formed in a straight pipe, or a screw connection may be used.

As shown in FIG. 4, one insertion port of the bending fluid pipe P3 is connected by the pipe joint 1 of the first embodiment, and the other insertion port of the bending fluid pipe P3 is connected by the pipe joint 60. The pipe joint 60 includes a flange 62 formed in the receiving port 61 of the fluid pipe P4, an inner peripheral surface 66 of the receiving port 61, a groove 68 in the inner peripheral portion of the receiving port 61, a seal member 65, and a retaining ring 63. A sealing member 65 is provided with a fastening member 64 for fastening the flange 62 and the push ring 63, and a retaining ring 69, and is inserted between the outer peripheral surface 67a of the insertion port 67 and the inner peripheral surface 66 of the receiving port 61. It is pressed by the push ring 63 to make a sealed connection.

In the pipe joint 60, the convex portion 67b formed on the outer periphery of the insertion port 67 is restrained by the retaining ring 69 fitted in the groove 68 of the inner peripheral portion of the receiving port 61, so that the movement is restricted by an earthquake, unequalness, etc. Even if a force due to subsidence acts, it is possible to prevent the insertion port 67 from coming out of the receiving port 61.

As shown in FIG. 5, one insertion port of the bending fluid pipe P5 is connected by the pipe joint 1 of the first embodiment, and the other insertion port 77 of the bending fluid pipe P5 is connected by the pipe joint 70. The pipe joint 70 includes a convex portion 74 formed in the receiving port 71 of the fluid pipe P6, a locking member 76 housed in a space formed inside the convex portion, and a pressing means 75 for pressing the locking member 76. The seal member 73 is provided, and is sealed and connected by the seal member 73 inserted between the outer peripheral surface 78 of the insertion port 77 and the inner peripheral surface 72 of the receiving port 71.

Also in the pipe joint 70, by pressing the locking member 76 against the insertion port 77 by the pressing means 75, it is possible to prevent the insertion port 77 from coming off from the receiving port 71 even if a force due to an earthquake or uneven settlement acts. ..

As shown in FIG. 6, one insertion port of the bent fluid pipe P7 is connected by the pipe joint 1 of the first embodiment, and the other receiving port 82 of the bent fluid pipe P7 is connected by the pipe joint 80. The pipe joint 80 includes an inner peripheral surface 83 of the receiving port 82 of the fluid pipe P7, an insertion port 81 of the fluid pipe P8, a seal member 85, a retaining ring 86, and a groove 87 formed on the inner circumference of the receiving port 82. , And is sealed and connected by a seal member 85 inserted between the inner peripheral surface 83 of the receiving port 82 and the outer peripheral surface 84 of the insertion port 81.

In the pipe joint 80, the convex portion 81a formed on the outer periphery of the insertion port 81 is restrained by the retaining ring 86 fitted in the groove 87 on the inner peripheral portion of the receiving port 82, so that the movement is restricted by an earthquake, unequalness, etc. Even if a force due to subsidence acts, it is possible to prevent the insertion port 81 from coming out of the receiving port 82.

Next, the pipe joint according to the second embodiment will be described with reference to FIG. 7. Reference numeral 20 in FIG. 7A is a pipe joint of the second embodiment. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

In the first embodiment, the locking member 14 was divided and configured, but in the pipe joint 20 of the second embodiment, the locking member 21 is integrally formed, and a threaded portion 21a is formed on the inner circumference thereof. It is screwed and integrated with the screw portion 25a formed on the outer periphery of the annular convex portion 25 as the convex portion of the above.

Since the inner diameter of the integrally formed push ring 22 is larger than the outer diameter of the annular convex portion 25, the push ring 22 inserted into the insertion port 23 can insert the annular convex portion 25. Further, after the integrally formed locking member 22 is screwed into the annular convex portion 25, the fixing means 26 (for example, a screw, a pin, etc.) is used to prevent the locking member 21 and the annular convex portion 24 from moving relative to each other. Fixed by. Since the outer dimension of the locking member 21 is larger than the inner diameter of the push ring 22, the contact surface 22a of the push ring 22 can come into contact with the contact surface 21c of the locking member 21 after the locking member 21 is fixed to the annular convex portion 24. become. Further, an annular seal member 12 made of synthetic rubber is inserted in the space between the tapered surface 4 and the outer peripheral surface 24 of the insertion port 23.

Hereinafter, the action and effect of the example of FIG. 7 will be described. As in the first embodiment, if the fastening means 17 is tightened so that the push ring 22, the locking member 21, and the end surface 3a of the flange 3 are in contact with each other, the sealing member 12 is in an appropriate compressed state and can be maintained in a sealed state for a long period of time. Can be.

Since the locking member 21 having an integral structure with higher rigidity is used instead of the locking member 14 having the divided structure of the first embodiment, locking is performed even when an external force in the tensile or compressive direction due to an earthquake or uneven settlement acts. The force with which the member 21 presses the seal member 12 becomes uniform, an appropriate compressive force can be maintained, and the sealed state can be maintained.

Since the locking member 21 and the annular convex portion 25 are fixed by the fixing means 26, the locking member 21 is fixed in the circumferential direction with respect to the annular convex portion, so that the locking member 21 twists the seal member 12. It is possible to maintain an appropriate compressive force without applying force and maintain a sealed state for a long period of time.

The annular convex portion 25 integrally formed with the insertion port is sandwiched between the push ring 22 and the flange 3 via the integrally formed locking member 21, and the movement is restricted, so that the movement is restricted, so that it may be subjected to an earthquake or uneven subsidence. Even when an external force in the tensile or compressive direction due to the action is applied, it is possible to prevent the insertion port 23 from moving with respect to the receiving port 2.

FIG. 8 is a pipe joint 30 of a modified example of the second embodiment. Whereas the pipe joint 20 of FIG. 7 of the previous embodiment is screwed and integrated with the threaded portion 21a formed on the inner circumference of the locking member 21 and the threaded portion 25a formed on the outer circumference of the annular convex portion 25. , The pipe joint 30 of FIG. 8 is formed by fitting an integrally molded locking member 32 to an annular convex portion 34. The fitting allowance between the locking member 32 and the annular convex portion 34 is determined in consideration of the external force applied to the pipe joint 30. Further, the locking member 32 and the annular convex portion 34 are fixed by the fixing means 35. The fixing means 35 can be fixed by providing a necessary number of screws, pins, or the like.

The operation and effect of the embodiment of FIG. 8 will be described. In the pipe joint 30, since the locking member 32 having a highly rigid integral structure is fitted to the annular convex portion 34, the locking member 32 presses the seal member 12 even if a force caused by an earthquake, uneven settlement, or the like acts. The force to be applied becomes uniform, an appropriate compressive force can be maintained, and a sealed state can be maintained.

Since the locking member 32 and the annular convex portion 34 are fixed by the fixing means 35, the locking member 32 is fixed in the radial direction and the circumferential direction with respect to the annular convex portion, so that the locking member 32 is a sealing member. The force pressing the 12 is more stable, and an appropriate compressive force can be maintained to maintain the sealed state for a long period of time.

Further, the annular convex portion 34 integrally formed with the insertion port 31 is sandwiched between the push ring 33 and the flange 3 via the integrally formed locking member 32, and the movement is restricted, so that an earthquake or inequality occurs. Even when a force caused by subsidence or the like acts, it is possible to prevent the insertion port 23 from moving with respect to the receiving port 2.

As described above, in the pipe joint of the second embodiment, the locking member has a highly rigid integrated structure, so that the locking member presses the seal member even if a force caused by an earthquake or uneven settlement acts. Is uniform, an appropriate compressive force can be maintained, and a sealed state can be maintained.

Next, the pipe joint according to the third embodiment will be described with reference to FIG. Reference numeral 40 in FIG. 9A is a pipe joint of the third embodiment. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

In the first and second embodiments, the seal member 12 was pressed by the locking member, but in the pipe joint 40 of FIG. 9, the seal member 12 is an annular convex portion as a convex portion of the present invention. It is pressed by the pressing surface 44b of 44. Further, in the circumferential groove 44a formed on the outer periphery of the annular convex portion 44, a locking member 43 having a C-shaped cross section is formed on the outer periphery of the annular convex portion 44 by expanding the diameter using a jig or the like. It is engaged with the circumferential groove 44a. Further, a fixing means 46 is fitted around the outer periphery of the locking member 43 to prevent the locking member 43 from coming out of the circumferential groove 44a.

When the locking member 43 is engaged with the annular convex portion 44, the push ring 45 comes into contact with the locking member 43. Further, an annular seal member 12 made of synthetic rubber is inserted in the space between the tapered surface 4 and the outer peripheral surface 42 of the insertion port 41.

Hereinafter, the action and effect of the example of FIG. 9 will be described. Also in the pipe joint 40 of FIG. 9, if the fastening means 17 is tightened so that the push ring 45, the locking member 43, and the end surface 3a of the flange 3 come into contact with each other, the sealing member 12 is in an appropriate compressed state and is kept in a sealed state for a long period of time. It can be maintained.

Since the pipe joint 40 of the third embodiment presses the seal member 12 by the annular convex portion 44 integrally formed with the insertion port 41, the step on the surface pressing the seal member 12 can be reduced, and the annular convex portion 44 can be reduced. However, the force pressing the seal member becomes more uniform, an appropriate compressive force can be maintained, and the sealed state can be maintained.

Since the annular convex portion 44 integrally formed with the insertion port is sandwiched between the push ring 45 and the flange 3 via the locking member 43, even when a force caused by an earthquake, unequal subsidence, etc. acts. , It is possible to prevent the insertion port 23 from moving with respect to the receiving port 2.

Next, the pipe joint according to the fourth embodiment will be described with reference to FIGS. 10 and 11. Reference numeral 50 in FIG. 10A is a pipe joint of the fourth embodiment. The same components as those shown in the above embodiment are designated by the same reference numerals, and duplicate description will be omitted.

In the pipe joint 50, as in the third embodiment, the seal member 12 is pressed by the pressing surface 54a of the annular convex portion 54 as the convex portion of the present invention. A bayonet claw 54b is formed on the outer circumference of the annular convex portion 54. The locking member 53 is integrally formed and includes a bayonet claw 53a that is joined to the bayonet claw 54b by a bayonet.

As shown in FIG. 11A, the bayonet claw 53a of the locking member 53 is formed so as to have a gap C so that it can pass between the bayonet claws 54b of the annular convex portion 54. The bayonet claw 53a passes between the bayonet claws 54b of the annular convex portion 54 and is arranged in the groove 54c as shown in FIG. 10A, and the locking member 53 is grooved as shown in FIG. 11B. When rotating in the circumferential direction in 54c, the bayonet claw 53a of the locking member 53 and the bayonet 54b of the annular convex portion 54 mesh with each other and cannot be pulled out in the axial direction. In this state, the bayonet claw 53a of the locking member 53 and the bayonet 54b of the annular convex portion 54 can be fixed by the fixing means 56 so as not to move in the circumferential direction. As the fixing means 56, a necessary number of pins, screws, and the like can be provided and fixed.

Hereinafter, the action and effect will be described with respect to the example of FIG. By tightening the fastening means 17 so that the push ring 55, the locking member 53, and the end surface 3a of the flange 3 come into contact with each other, the sealing member 12 is in an appropriate compressed state, and the sealed state can be maintained for a long period of time.

In the pipe joint 50, since the annular convex portion 54 integrally formed with the insertion port 51 presses the seal member 12, the step on the surface that presses the seal member 12 can be reduced, and the annular convex portion 54 presses the seal member. The pressing force becomes more uniform, an appropriate compressive force can be maintained, and a sealed state can be maintained.

Since the bayonet claw 53a of the locking member 53 and the bayonet 54b of the annular convex portion 54 are fixed by the fixing means 56, there is no possibility of disassembling the bayonet coupling.

The annular convex portion 54 integrally formed with the insertion port is sandwiched between the push ring 55 and the flange 3 via the locking member 53 coupled with the bayonet, and the movement is restricted, so that the movement is restricted, so that it may be subjected to an earthquake or uneven subsidence. Even when an external force in the tensile or compressive direction due to the action is applied, it is possible to prevent the insertion port 51 from moving with respect to the receiving port 2.

As shown in FIGS. 4 to 6 of the first embodiment, in the second to fourth embodiments, one of the bent fluid pipes P2 and the other of the bent fluid pipes P2 may be connected by different types of pipe joints.

Although examples of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these examples, and any changes or additions within the scope of the gist of the present invention are included in the present invention. Is done.

For example, the pipe joint of the present invention has been shown as an example of being applied to a pipe joint of a bent fluid pipe, but the present invention is not limited to this, and a pipe that seals and connects a straight pipe, a short pipe, a different diameter pipe, a pipe connection portion of a valve, and the like. It can also be used as a fitting.

1 Pipe fitting 2 Receiving port 3 Flange 4 Tapered surface 10 Insertion port 12 Sealing member 13 Circular convex part (convex part)
14 Locking member 15 Fixing means 16 Pushing ring 17 Fastening member 20 Pipe fitting 21 Locking member 22 Pushing ring 23 Insertion 25 Ancillary convex part (convex part)
26 Fixing means 30 Pipe fitting 31 Insertion 32 Locking member 33 Push ring 34 Circular convex part (convex part)
35 Fixing means 40 Pipe fitting 41 Insertion 43 Locking member 44 Annular convex part (convex part)
44b Pressing surface 45 Pushing ring 50 Pipe fitting 51 Insertion 53 Locking member 54 Annular convex part (convex part)
54a Pressing surface 55 Pushing ring 56 Fixing means

Claims (3)

A flange integrally formed with the receiving port, a tapered surface formed on the inner circumference of the opening of the flange, and an outer peripheral surface of the insertion port inserted into the receiving port and the tapered surface are interposed in a compressed state. Insertion of the fluid tube into the receiving port of the fluid tube including the sealing member to be formed, the convex portion formed on the outer peripheral surface of the insertion port, the push ring, and the fastening member for fastening the flange and the push ring. It is a pipe joint that is sealed and connected by inserting a locking member, which is engaged with the convex portion and has a locking member whose outer diameter dimension at the time of engagement is larger than the inner diameter dimension of the push ring, and the push ring is integrally formed in an annular shape. The inner diameter is larger than the outer diameter of the convex portion, and the locking member and the end face of the flange are prevented from coming into contact with each other to prevent the tip of the insertion port from coming into contact with the receiving port. A pipe joint characterized in that the locking member and the tapered surface are separated from each other without contact by the sealed member in a compressed state. The pipe joint according to claim 1, wherein the inner diameter dimension of the push ring is smaller than the outer diameter dimension of the seal member. The pipe joint according to claim 1 or 2, wherein the locking member includes a fixing means for preventing movement with respect to the convex portion.

Images