JP2007138970A - Cap structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap structure installable to a deformed pipe with a projection part formed on an outside surface of an insertion port, in a separation preventive state. <P>SOLUTION: A cap 15 is structured such that it is put on an opening end part of a pipe 35 to seal this opening end part. A flange 18 is formed on the outer periphery of an opening end part of the cap 15, and an annular sealant 23 is arranged between the inner periphery of the opening end part of the cap 15 and the outer periphery of the pipe 35. A first pressing ring 38 for compressing the sealant 23 is out-fitted to the pipe 35 by being fastened to the flange 18 of the cap 15 by a bolt 43 in the pipe axis direction. The projection part 37 is formed on an outside surface of the pipe 35 in a position separate more than the first pressing ring 38 from the flange 18 of the cap 15. A second pressing ring 39 for pressing the projection part 37 in the direction of the cap 15 is out-fitted to a part of the pipe 35 in a position corresponding to the projection part 37 by being fastened by the bolt 43. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of a cap for sealing a pipe end.

  As this type of cap, for example, a cap described in Patent Document 1 is known. The cap described in Patent Document 1 includes a member that seals between the end portion of the tube and a tube for preventing the cap from separating from the tube end due to the action of fluid pressure in the tube. And a member mechanically coupled to the end. The pipe described in Patent Document 1 has a so-called slip-on type joint that is configured to be joint-joined simply by inserting an insertion port into a receiving port in a state where a sealing material is deposited.

  As a pipe joint that prevents the joint from being detached, a protrusion is formed at the tip of the insertion port, a lock ring is accommodated inside the receiving port, and the protrusion elastically locks the lock ring when the insertion port is inserted into the receiving port. The protrusion is able to pass through the lock ring position to the back side of the receiving port by pushing it apart, and after passing, the lock ring is reduced in diameter by elastic force and hugs the outer periphery of the insertion port Is known (Patent Document 2). With such a configuration, when a pulling force acts between the receiving port insertion holes, the protrusion of the insertion port hits the lock ring, thereby preventing the joint from being detached.

A cap shown in FIG. 5 is known as a cap that can be sealed by being attached to the distal end of the insertion port of the pipe that prevents such a joint from being detached.
In FIG. 5, 11 is a ductile cast iron pipe, and an insertion slot 12 is formed at the end thereof. A protrusion 13 is integrally formed on the outer periphery of the distal end portion of the insertion opening 12, and a tapered surface 14 that is tapered from the protrusion 13 is formed on the outer periphery of the insertion opening 12 on the opening end side further than the protrusion 13. Is provided.

  Reference numeral 15 denotes a cap, which is formed into a cap shape using ductile cast iron similar to the tube 11. The bottom portion 16 facing the opening of the insertion port 12 of the tube 11 and the receiving port 17 disposed so as to cover the insertion port 12 are integrated. It is the structure formed in. A flange 18 is formed on the outer periphery of the opening end portion of the receiving port 17, and bolt through holes 19 in the tube axis direction are formed in the flange 18 in a through state at a plurality of positions along the tube circumferential direction. On the inner periphery of the receiving port 17, a tapered sealing material pressure contact surface 20, an inner peripheral protrusion 21, and a lock ring receiving groove 22 are formed in order from the opening end side.

  An annular rubber seal material 23 is disposed between the seal material pressure contact surface 20 of the receiving port 17 and the outer peripheral surface of the insertion port 12. A push ring 24 is fitted around a portion of the insertion opening 12 outside the receiving opening 17. A similar bolt passage hole 25 in the tube axis direction is formed in the pusher wheel 24 at a position corresponding to the bolt passage hole 19 of the flange 18 of the receiving port 17. Then, the T-head bolt 26 is passed through the bolt through holes 19 and 25, and a nut 27 is screwed onto the T-head bolt 26 and the press ring 24 is fastened to the flange 18 of the receiving port 17. 23 can be compressed so that the space between the receiving port 17 and the insertion port 12 can be sealed. By providing the backup ring 28 between the sealing material 23 and the inner peripheral projection 21, the sealing material 23 is prevented from entering the back side of the receiving port 17 more than necessary.

  The lock ring receiving groove 22 accommodates a lock ring 29 which is annular and has a split portion formed at one place in the circumferential direction. The lock ring 29 is elastically held around the outer periphery of the insertion opening 12 in a state in which the protrusion 13 of the insertion opening 12 enters the back side of the cap 15 with respect to the lock ring 29. 30 is a centering rubber for holding the lock ring 29 concentrically in the receiving groove 22 when the insertion slot 12 is not inserted into the cap 15.

  In such a configuration, when the cap 15 is attached to the insertion opening 12 of the tube 11, the seal member 23 and the backup ring 28 are fitted on the insertion opening 12 in advance, and the lock groove 22 of the cap 15 is inserted into the lock groove 22. 29 is accommodated in a state of being centered by rubber 30. When the insertion port 12 is inserted into the receiving port 17 in this state, the protrusion 13 passes through the position of the lock ring 29 while elastically expanding the lock ring 29 by the action of the tapered surface 14, and It reaches a position behind the lock ring 29. Then, the lock ring 29 is reduced in diameter by an elastic force and is hung on the outer peripheral surface of the insertion opening 12.

  Next, the backup ring 28 and the sealing material 23 are fed between the pressure contact surface 20 of the receiving port 17 and the outer peripheral surface of the insertion port 12 to fit the push ring 24 to the tube 11, and the T-head bolt 26 and The push ring 24 is fastened to the flange 18 of the receiving port 17 by the nut 27. Then, the seal material 23 is pushed by the push ring 24 while being backed up by the backup ring 28, and is thereby pressed against the seal material pressure contact surface 20 of the receiving port 17 and the outer peripheral surface of the insertion port 12. The seal function is demonstrated.

When the fluid pressure in the tube acts, the fluid pressure acts on the bottom portion 16 of the cap 15, so that the cap 15 tends to come off from the insertion opening 12. However, at this time, since the protrusion 13 of the insertion port 12 is hooked on the lock ring 29 accommodated in the receiving port 17, the cap 15 and the insertion port 12 of the tube 11 are prevented from being detached.
Japanese Utility Model Publication No. 6-32894 JP 2000-304176 A

The pipe 11 shown in FIG. 5 is a normal straight pipe, and the cap 15 can be mounted without any problem as shown.
However, in addition to the straight pipe as described above, a so-called deformed pipe such as a curved pipe is used as the pipe. In this deformed pipe, various protrusions are formed on the outer surface of the insertion port as will be described later for the purpose of preventing bending of the joint part and improving the workability during joint joining. For this reason, when this protrusion hits the push wheel 24 shown in FIG. 5, the protrusion 13 of the insertion opening 12 cannot be inserted deeper than the lock ring 29 in the cap 15. For this reason, there exists a technical subject that it becomes impossible to exhibit the separation preventing function against the fluid pressure in the pipe.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve such problems and to obtain a cap structure that can be attached to a deformed tube having a protrusion formed on the outer surface of the insertion opening in a state of preventing detachment. .

  In order to achieve this object, the present invention provides a cap-shaped cap structure that covers an open end of a tube and seals the open end of the tube, and is provided on the outer periphery of the open end of the cap. A flange is formed, an annular sealing material is provided between the inner periphery of the opening end of the cap and the outer periphery of the tube, and the sealing material is fastened to the flange of the cap by a bolt in the tube axis direction. A compressible first pusher wheel is fitted onto the pipe, and a protrusion is formed on the outer surface of the pipe at a position farther from the cap flange than the first pusher wheel, and is fastened by the bolt. A second push ring capable of pressing the portion in the direction of the cap is fitted to a portion of the tube at a position corresponding to the protrusion.

  Therefore, according to the present invention, since the second press ring fastened by the bolt can press the protrusion on the outer surface of the insertion port toward the cap, the protrusion is formed on the outer surface of the insertion port. It can be attached to the tube in a state of preventing detachment. Further, the projection is formed on the pipe from the beginning, and the second is utilized by using a bolt for fastening the first push wheel, which is originally installed for compression of the sealing material, to the flange. Since the push wheel is also fastened, the detachment preventing function can be achieved with a small number of parts, with only a slight change in the configuration that changes the length of the bolt.

Hereinafter, the structure of the cap according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 and the same members as those shown in FIG.
In FIG. 1, reference numeral 35 denotes a tube to which a cap 15 is to be attached. A protrusion 13 and a tapered surface 14 are formed at the tip of the insertion opening 12. Projections 36 and 37 are formed on the outer surface of the tube 35 at a position spaced from the projection 13 at the tip in the tube axis direction. As shown in FIG. 1 and FIG. 2, the protrusions 36 are provided for the purpose of preventing the joint 12 from bending when the insertion opening 12 of the pipe 35 and the receiving opening of another pipe are joined. Are formed at a relatively low height corresponding to the gap, and are formed at eight positions along the circumferential direction. On the other hand, the protrusion 37 is for generating a pushing force of the insertion opening into the receiving opening when the joint is joined, and is formed integrally with the protrusion 36 and higher than the protrusion 36, and in the circumferential direction. Are provided in correspondence with the protrusions 36 at four positions.

  Reference numeral 38 denotes a first pusher wheel, and 39 denotes a second pusher wheel, which are fitted to the pipe 35 at a position spaced from the cap 15. These push wheels 38 and 39 have the same structure, and are divided at two positions along the circumferential direction as shown in FIGS. 3 and 4. Reference numeral 40 denotes the division unit. The push wheels 38 and 39 are respectively formed with similar bolt-through holes 41 and 42 in the tube axis direction at positions corresponding to the bolt-through holes 19 of the flange 18 of the receiving port 17. The T-head bolt 43 is longer than that shown in FIG. 5 and is configured to penetrate through the flange 18 of the cap 15, the first pusher wheel 38, and the second pusher wheel 39. The first pusher wheel 38 is fastened to the flange 18 by a T-head bolt 43 and a nut 44 so as to press the sealing material 23. The second pusher wheel 39 is fastened by the T-head bolt 43 and the nut 45 so that the protrusion 37 can be pressed toward the cap 15. Further, as shown in FIG. 4, the push wheels 38 and 39 are overlapped with each other at the split portion 40 in the split portion 40, and bolt through holes 41 and 42 are formed in the overlap portion so that the T-head bolt 43 is passed. The divided end portions are integrated to be assembled in an annular shape. As shown in the figure, the receiving groove 17 of the receiving port 17 does not contain a lock ring or centering rubber.

  In such a configuration, when the cap 15 is attached to the insertion opening 12 of the tube 35, the sealing material 23 and the backup ring 28 are fitted onto the insertion opening 12 in advance. However, no lock ring or centering rubber is accommodated in the accommodation groove 22 of the cap 15. In this state, the insertion opening 12 is inserted into the receiving opening 17, and the protrusion 13 reaches the vicinity of the accommodation groove 22 in the cap 15.

  Next, the backup ring 28 and the sealing material 23 are fed between the pressure contact surface 20 of the receiving port 17 and the outer peripheral surface of the insertion port 12, and the first push ring 38 is fitted to the tube 35, and the T head Fastening is performed using bolts 43 and nuts 44. As a result, the pusher wheel 38 is assembled in an annular shape, and the sealing material 23 is pressed to exhibit a required sealing function. At this time, the insertion opening 12 of the tube 35 enters the inside of the receiving opening 17 of the cap 15 only to the extent that the protrusions 36 and 37 do not hit the first push wheel 38 or the like. In other words, the insertion opening 12 cannot be inserted into the cap 15 to the extent that the protrusion 13 at the tip passes the position of the receiving groove 22. Therefore, in this case, it is not possible to prevent detachment by the lock ring of the receiving port 17 and the protrusion 13 at the tip of the insertion port 12 as shown in FIG.

  Next, similarly, the second presser wheel 39 is fitted onto the pipe 35, the T head bolt 43 is passed through the bolt through hole 42 to assemble the press wheel 39 into an annular shape, and the nut 45 is screwed to the T head bolt 43. As a result, the second pusher wheel 39 is fastened so that the protrusion 37 can be pushed toward the cap 15 by the second pusher wheel 39. Thus, the operation of attaching the cap 15 to the tip of the tube 35 is completed.

  When the fluid pressure in the tube acts, the fluid pressure acts on the bottom portion 16 of the cap 15, so that the cap 15 tends to come off from the insertion opening 12. However, at that time, the second presser wheel 39 fastened by the T-head bolt 43 and the nut 45 hits the plurality of protrusions 37 in the circumferential direction of the pipe 35 and presses the protrusions 37 toward the cap 15. This prevents the cap 15 and the insertion opening 12 of the tube 35 from being detached.

  As described above, when the pipe 35 has the protrusions 36 and 37 integrally, the T-head bolt 43 that is longer than usual is used, and the first push ring 38 for pressing the sealing material 23 is used. By having the protrusions 36 and 37 by fastening the second pusher wheel 39 of the same configuration with the T-head bolt 43 and enabling the protrusion 37 to be pressed toward the cap 15 by the second pusher wheel 39. The cap 15 can be attached to the tube 35 in a state of preventing detachment while the protrusion 13 at the tip of the insertion opening 12 cannot be inserted deeper than the lock ring receiving groove 22 inside the cap 15.

It is sectional drawing which shows the structure of the cap of embodiment of this invention. It is a cross-sectional view of the principal part in FIG. It is sectional drawing of the push ring of FIG. It is a whole figure of the same press ring. It is sectional drawing which shows the structure of the conventional cap.

Explanation of symbols

15 Cap 18 Flange 23 Seal material 35 Pipe 37 Projection 38 First push ring 39 Second push ring 43 T-head bolt

Claims (1)

  A cap-like cap structure for covering the open end of the tube and covering the open end of the tube, wherein a flange is formed on the outer periphery of the open end of the cap, and the open end of the cap An annular sealing material is provided between the inner periphery of the section and the outer periphery of the tube, and a first push ring capable of compressing the sealing material by fastening to the flange of the cap by a bolt in the tube axis direction is provided on the tube. A projection is formed on the outer surface of the pipe at a position that is externally fitted and separated from the flange of the cap from the first push ring, and can be pressed in the direction of the cap by fastening with the bolt. A cap structure characterized in that the second push ring is fitted on a portion of the tube at a position corresponding to the protrusion.

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