JP2010223381A - Pipe joint, and method for constructing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint having a novel construction for easily and quickly connecting two pipe bodies to each other without the need for applying any machining to the pipe bodies, and to provide a method for constructing the same. <P>SOLUTION: An annular seal member 18 is adhered to abutting portions at the one-side opening ends of the two pipe bodies 14a, 14b through their outer peripheral faces for sealing. A one-way lock member 32 is provided for locking the pipe bodies 14a, 14b to each other on their outer peripheral faces in their abutting condition at both axial ends of the annular seal member 18 to allow the movement of the pipe bodies 14a, 14b in their abutting direction while preventing the movement of the pipe bodies 14a, 14b in the opposite direction to their abutting direction. An energizing means 38 is also provided for energizing the one-way lock member 32 toward the pipe bodies 14a, 14b to hold the pipe bodies 14a, 14b locked to each other in their abutting condition. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe joint used for piping in factories, water and sewage systems, and a pipe joint construction method.

  In chemical plants and many other factories and water and sewage systems, etc., in order to form a flow path through which various fluids such as media, power sources, clean water, sewage, etc., are circulated in addition to raw materials and products having fluid properties A piping structure is used. The piping structure forms a desired flow path by connecting a plurality of pipes having a predetermined length for manufacturing, construction, or management reasons.

  By the way, generally in the connection of the pipe body in such a piping structure, the pipe joint by the bolt fastening using a flange is employ | adopted. That is, a flange is formed at each open end of two pipes connected to each other, the open end of each pipe is abutted, and the flanges are fastened and fixed with tightening bolts at a plurality of locations on the circumference. By connecting the pipes.

  However, in such a pipe joint, it was necessary to weld the flange to the open end of the pipe body. In addition, it is necessary to connect the flanges of the two tubular bodies by fixing them with a plurality of bolts on the circumference. Therefore, there has been a problem that much labor and time are required for connecting the pipe bodies.

  Japanese Patent Laid-Open No. 2002-340258 (Patent Document 1) proposes a pipe joint that does not require flange welding to the pipe body and that eliminates the need for fixing a plurality of bolts on the circumference.

  However, the pipe joint described in Patent Document 1 requires a plurality of steel balls that exert a pressing and locking force on the metal pipe, and the structure is complicated and the manufacturing cost is high. Moreover, by tightening the screw sleeve that is externally inserted into the tube body, the tightening force is exerted on the tube body as a fixing force via the steel ball. Therefore, when the tube diameter increases, the screw sleeve increases in size. There is a problem that the pipe joint becomes very large and the screw sleeve is difficult to tighten. Therefore, the pipe joint described in Patent Document 1 does not provide an effective solution with respect to the above-described problem of easily and quickly connecting pipe bodies.

JP 2002-340258 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is that it is not necessary to perform any processing on the tube, and two tubes can be easily formed. It is another object of the present invention to provide a pipe joint having a novel structure and a pipe joint construction method using the same.

  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  The present invention relates to a pipe joint in which one open end of two pipes is connected in fluid communication with each other in a butted state and communicates with each other. An annular seal member is brought into intimate contact with the outer peripheral surface of the portion and sealed, and the tubular body is brought into contact with and locked to the outer peripheral surface of the tubular body on both axial sides of the annular seal member. A one-way lock member that prevents the tube body from moving in the butting direction while preventing the tube body from moving in the butting direction, and urges the one-way lock member toward the tube body to An urging means is provided for holding in a state of abutment locking with respect to.

  In such a pipe joint structured according to the present invention, the movement of the pipe body in the direction opposite to the abutting direction, that is, the movement of the pipe body in the pulling-out direction is applied to the outer circumferential surface of the one-way lock member. It is blocked based on the contact locking action. In particular, since the one-way lock member is held in contact with and locked to the outer peripheral surface of the tubular body by the urging means, the effect of preventing movement of the tubular body in the pulling-out direction is stably exhibited.

  Moreover, in the present invention, the fluid tightness at the connecting portion of the two pipe bodies is ensured by the annular seal member that does not use the fixing force of the two pipe bodies. Therefore, it is possible to connect the two pipe bodies with a simple operation with the one-way lock member while sufficiently securing the sealing performance at the connection portion of the two pipe bodies. In short, the present invention can achieve such a special technical effect not only by adopting the one-way lock member but also by employing it in combination with the annular seal member.

  Further, in the present invention, an annular joint housing in which each opening end portion on the connection side of the two pipe bodies is inserted from both sides in the axial direction is used, and by swinging displacement around a support shaft provided in the joint housing. A locking cam that is brought into contact with and spaced apart from the outer peripheral surface of the tubular body is provided, and the one-way locking member is constituted by the locking cam, and the support shaft of the locking cam is used as the outer periphery of the tubular body. The locking cam extends from the support shaft toward the butting side opening end of the tube body so as to be parallel to the tangential line of the tube body on the side, and the butting side opening of the tube body from the support shaft A mode in which the locking cam is brought into contact with and locked to the outer peripheral surface of the tubular body on the end side is preferably employed.

  In this aspect, when the tubular body is moved in the pulling direction, the frictional force generated between the locking cam and the tubular body acts on the locking cam as a rotational moment around the support shaft. The locking cam can be locked to the tubular body by using the force that swings the locking cam around the support shaft.

  On the other hand, when the tube body is moved in the insertion direction, the frictional force generated between the locking cam and the tube body acts as a rotational moment in the opposite direction on the locking cam. Therefore, the locking cam can be swung in the direction away from the tube against the urging force of the urging means, and the movement of the tube in the insertion direction can be allowed.

  Further, in the present invention, an annular joint housing in which each open end on the connection side of the two pipe bodies is inserted from both sides in the axial direction is used, and at least one of the pipe bodies is temporarily fixed to the joint housing. A mode in which temporary fixing means is provided is preferably employed.

  In this aspect, by determining only the amount of insertion of one of the pipes into the joint housing in advance, the butted portions of the two pipes can be easily aligned with the annular seal member. That is, after inserting one pipe body into the joint housing by a predetermined amount and temporarily fixing it with the temporary fixing means, the other pipe body may be inserted into the joint housing until it comes into contact with the one pipe body. It is not necessary to know the proper amount of insertion.

  Further, in the present invention, a mode in which a release state maintaining unit that releases the contact locking state of the one-way lock member to the tubular body by the biasing unit and maintains the released state is preferably employed. Is done.

  In this aspect, the one-way lock member can be kept in the non-locked state with respect to the tubular body by the released state maintaining means. Therefore, the pipe body can be easily pulled out from the joint housing when the pipe body is removed, replaced, or inspected.

  On the other hand, the feature of the pipe joint construction method according to the present invention is a pipe joint construction method using the pipe joint having the structure according to the present invention described above, and (a) a continuously used pipe that is continuously used. An exchange tube determining step for determining an exchanged tube to be exchanged with respect to the body, (b) one of the exchange tube replaced with the exchanged tube, and the continuous use tube A pipe joint extrapolation step of extrapolating the pipe joint with respect to the above, and (c) a replacement pipe arrangement step for abutting each open end of the continuous use pipe body and the replacement pipe body, d) The pipe joint is slid to the other side of the replacement tube body and the continuous use tube body, and the opening end portion of the replacement tube body and the open end portion of the continuous use tube body are brought into contact with each other. The annular seal member is extrapolated with respect to the portion, and on one side in the axial direction of the annular seal member The one-way lock member is abutted and locked to the outer peripheral surface of the replacement tube, and the one-way lock member is abutted and locked to the outer peripheral surface of the continuously used tube body on the other axial side of the annular seal member. The pipe joint construction method includes a pipe body locking step.

  According to the method of the present invention, even a tubular body that forms the middle portion of the flow path can be easily and quickly replaced.

  Further, in the method of the present invention, the exchange tube determining step may cut the axial intermediate portion of a specific tube and use one of the cut tubes as the exchanged tube. . Thereby, for example, when a part of the pipe body is corroded, the corroded part can be cut and the remaining part can be used as it is.

The longitudinal cross-sectional view which shows the connection structure of the pipe body by the pipe joint as one Embodiment of this invention. II-II sectional drawing in FIG. The longitudinal cross-sectional view which expands and shows the latching release state of the locking cam shown by FIG. IV-IV sectional drawing in FIG. The longitudinal cross-sectional view for demonstrating the method of this invention. The front schematic of the pipe line for demonstrating a pipe joint extrapolation process. The front schematic of the pipe line for demonstrating an exchange pipe body determination process. The front schematic of the pipe line for demonstrating the replacement pipe | tube arrangement | positioning process. The longitudinal cross-sectional view of the pipe line for demonstrating a pipe body locking process. The front schematic of the pipe line for demonstrating an exchange pipe body determination process. The front schematic of the pipe line for demonstrating a pipe joint extrapolation process. The front schematic of the pipe line for demonstrating the replacement pipe | tube arrangement | positioning process. The longitudinal cross-sectional view of the pipe line for demonstrating a pipe body locking process.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2 show a pipe line as a piping structure including a pipe joint 10 as an embodiment of the present invention. The pipe joint 10 includes an annular joint housing 12. And the pipe line is comprised by inserting and connecting the two pipe bodies 14a and 14b to this joint housing 12 from the axial direction both sides.

  More specifically, the joint housing 12 has a cylindrical shape, and both annular plate-shaped wall portions 13 and 13 projecting inward in the radial direction are integrally formed at both axial ends. . Thereby, in the joint housing 12, an annular recess 16 opened to the inner peripheral surface is continuously formed on the entire circumference. The joint housing 12 is formed of a hard material such as metal or synthetic resin including both the wall portions 13 and 13.

  Further, a substantially cylindrical annular seal member 18 is disposed on substantially the same central axis in the opening portion of the annular recess 16. The annular seal member 18 is formed of a material that is elastically deformable and takes into consideration the impermeability, durability, and the like of the fluid flowing in the pipe bodies 14a and 14b.

  In particular, in the present embodiment, annular seal pieces 20 and 20 projecting outward in the radial direction are integrally formed over the entire circumference at both axial ends of the annular seal member 18. The pair of annular seal pieces 20, 20 are in close contact with both wall portions 13, 13 constituting the inner surface of the annular recess 16, respectively. The annular seal pieces 20 and 20 are pressed against the wall portions 13 and 13 even when no special external force is exerted on the annular seal member 18 other than the contact reaction force due to the assembly to the joint housing 12. It is desirable. Thereby, the opening of the annular recess 16 is covered, and the annular recess 16 serves as the working air chamber 22.

  In addition, cylindrical extending pieces 24 extending outward in the axial direction are integrally formed at the peripheral edge portions of the openings on both sides in the axial direction of the annular recess 16. A plurality of opening windows 26 are formed in each extending piece 24 at appropriate intervals in the circumferential direction. The opening window 26 is a slit-like long hole that extends through the extension piece 24 and extends in the axial direction by a predetermined length.

  A pair of support walls 28, 28 projecting from the outer peripheral surface of the extension piece 24 are formed at both circumferential edges of each opening window 26. A support shaft 30 is disposed between the pair of support walls 28 and 28. That is, the support shaft 30 extends in the tangential direction of the extension piece 24 so as to be separated from the opening window 26 on the outer peripheral side of the extension piece 24. Moreover, the support shaft 30 is located on the opening window 26 so as to be biased toward the axially extending end side of the extending piece 24.

  A lock cam 32 as a one-way lock member is attached to the support shaft 30. The locking cam 32 is a plate cam and has a substantially water-drop-like planar shape. A support hole 34 penetrating in the thickness direction is formed on the narrow end portion side (waterdrop-shaped tip end side). By inserting the support shaft 30 into the support hole 34, the locking cam 32 is assembled so as to be swingable around the support shaft 30. Further, along with the swinging around the support shaft 30, the large end portion side (the water droplet-shaped lower end portion side) of the locking cam 32 protrudes from the opening window 26 to the inner peripheral side of the extension piece 24. ing.

  A large number of sawtooth-like locking teeth 35 are formed on the side peripheral surface of the locking cam 32 protruding from the opening window 26 on the large end side. These locking teeth 35 protrude inward from the opening window 26 and come into contact with the outer peripheral surfaces of the tubes 14a and 14b. Each locking tooth 35 has a sharp shape in a side view of the locking cam 32. More preferably, each locking tooth 35 protrudes inclined toward the opposite side to the support shaft 30. That is, on the outer peripheral surface of the locking cam 32, each locking tooth 35 protrudes from the narrow end portion side toward the large end portion side as it goes to the protruding tip portion. Thereby, by contacting the surfaces of the tubular bodies 14a and 14b, a one-way locking function is exhibited with respect to the tubular bodies 14a and 14b, as will be described later.

  The locking cam 32 is formed with a pin hole 36 penetrating in the plate thickness direction at a position where it swings and displaces around the support shaft 30 and does not enter the opening window 26. That is, the pin hole 36 is located on the locking cam 32 on the substantially opposite side in the swing direction from the portion protruding inward from the opening window 26.

  Further, a leaf spring 38 as urging means is provided outside the rocking cam 32 in the swinging direction. The leaf spring 38 is made of spring steel or the like and has a longitudinal plate shape as a whole. Such a leaf spring 38 is supported at one end in the longitudinal direction on a connecting wall 40 that connects the pair of support walls 28, 28 on the inner side in the axial direction (the base end side of the extension piece 24) than the opening window 26. It is arrange | positioned in the state made. As a result, the locking cam 32 is oscillated and displaced in the direction of exiting the opening window 26 against the urging force of the leaf spring 38.

  Furthermore, a plurality of screw holes 42 are formed in each extending piece 24 at appropriate intervals in the circumferential direction. A positioning bolt 44 as a temporary fixing means is screwed into each of the plurality of screw holes 42.

  Two pipe bodies 14a and 14b are inserted into the joint housing 12 having such a structure from both sides in the axial direction. The two pipe bodies 14a and 14b each extend with a substantially constant inner and outer diameter, and in this embodiment, a metal pipe body such as a steel pipe or a cast iron pipe is employed.

  Further, in a state where the two pipe bodies 14 a and 14 b are inserted into the joint housing 12 from both sides in the axial direction, the butted portions of the two pipe bodies 14 a and 14 b are positioned on the inner peripheral side of the annular seal member 18. is doing. In this state, when air is fed into the working air chamber 22 from a pressure supply / discharge device 46 as supply / exhaust means, the pressure in the working air chamber 22 rises, and the annular seal member 18 has two tubes 14a and 14b. It adheres from the outer peripheral surface to the butted portion. Further, the annular seal pieces 20, 20 are brought into close contact with the inner surface of the annular recess 16 formed in the joint housing 12, and the sealing performance of the working air chamber 22 is ensured.

  Prior to the supply of pressurized air by the pressure supply / discharge device 46, first, the three-way switching valve 54 is switched to connect the air pressure source 48 to the working air chamber 22. The three-way switching valve 54 is disposed on a pneumatic conduit 52 that connects a pneumatic source 48 provided in the pressure supply / discharge device 46 and a supply / discharge fitting 50 provided on the bottom wall of the annular recess 16. As a result, the working air chamber 22 is filled with air of a predetermined pressure, and it is confirmed that the working air chamber 22 has reached the target pressure. This pressure confirmation can be confirmed by a pressure sensor 56 disposed on the pneumatic pipe line 52. After the three-way switching valve 54 is switched, the working air chamber 22 is held in a sealed state and pressure is maintained. Further, the discharge of the pressure air from the working air chamber 22 is performed by switching the three-way switching valve 54 and connecting the working air chamber 22 to the atmosphere.

  Furthermore, the locking cam 32 extends to the proximal end side of the extension piece 24 in a state where it is inserted into the opening window 26 with the two pipe bodies 14a, 14b being inserted into the joint housing 12 as described above. It protrudes and is abutted and locked to the outer peripheral surfaces of the tubular bodies 14 a and 14 b on the proximal end side of the extension piece 24 with respect to the support shaft 30. In this state, the locking cam 32 pushes the leaf spring 38 outward in the swinging direction. As a result, the urging force of the leaf spring 38 is exerted on the locking cam 32, and the contact locking state of the locking cam 32 with the tubular bodies 14a and 14b is maintained.

  Next, a pipe joint construction method using the pipe joint 10 as described above will be described. First, the amount of insertion of the one pipe body 14a into the pipe joint 10 is measured in advance, and a mark is put on the outer peripheral surface by scoring or the like. One tube body 14a thus marked is inserted by a predetermined insertion amount from one side in the axial direction.

  At that time, the locking cam 32 swings in a direction away from the one tubular body 14 a against the urging force of the leaf spring 38. The swing driving force acts as a moment that the frictional force generated between the one tube body 14a swings the locking cam 32 around the support shaft 30 in the direction separating from the one tube body 14a. Demonstrated in Thereby, the contact locking state of the locking cam 32 with respect to the one tubular body 14 a is maintained based on the urging force of the leaf spring 38.

  Further, when one tube body 14a is pulled out while the locking cam 32 is in contact with and locked, the locking teeth 35 of the locking cam 32 further bite into the outer peripheral surface of the one tube body 14a. That is, the locking force of the tubular body 14a by the locking cam 32 is exhibited by the action of the rotational moment based on the frictional force exerted on the locking cam 32 by the tubular body 14a. Accordingly, in the state where the locking cam 32 is in contact with and locked to the one tubular body 14a, the movement of the one tubular body 14a in the drawing direction is prevented.

  If one of the tubes 14a is inserted too much, the release pin 58 is inserted into the pin hole 36 formed in the locking cam 32 as shown in FIGS. Is engaged with the protruding end surfaces of the pair of support walls 28, 28, so that the locking cam 32 is separated from the one tubular body 14a and the locking cam 32 is brought into contact with the one tubular body 14a. Release the stop state. Thereby, the movement to the drawing direction of one tubular body 14a is permitted. As a result, the insertion amount of one tube 14a can be adjusted while moving one tube 14a in the pulling direction. As is clear from this, in this embodiment, the pin hole 36 formed in the locking cam 32, the release pin 58 inserted through the pin hole 36, and a pair of support walls to which the release pin 58 is locked. 28 and 28 constitute release state maintaining means.

  Then, the positioning bolt 44 is tightened in a state where the one tubular body 14a is inserted by a predetermined insertion amount, and the tip of the positioning bolt 44 is pressed against the outer peripheral surface of the one tubular body 14a. Thereby, the movement to the insertion direction of one pipe body 14a is also prevented, and one pipe body 14a is temporarily fixed to the pipe joint 10. FIG.

  Further, the other pipe body 14b is inserted from the other side in the axial direction into the pipe joint 10 to which the one pipe body 14a is temporarily fixed in this manner. At this time, the locking cam 32 is moved away from the other tubular body 14b against the urging force of the leaf spring 38 in the same manner as the locking cam 32 abutted and locked to the one tubular body 14a. Swing. As a result, the contact locking state of the locking cam 32 with the other tubular body 14 b is also maintained based on the urging force of the leaf spring 38. Further, the movement of the other tube body 14b in the pulling direction is the same as that in which the one tube body 14a is prevented from moving in the pulling direction by the contact locking action of the locking cam 32. Is prevented based on the abutment locking action. Note that the insertion of the other tube body 14b may be performed until the tube body 14b comes into contact with the other tube body 14a, or may be performed only with a dimension measured in advance.

  Thereafter, air is fed into the working air chamber 22 to bring the annular seal member 18 into close contact with the abutting portions of the two pipe bodies 14a and 14b from the outer peripheral surface. Thereby, the two pipe bodies 14a and 14b are fluid-tightly connected to each other in a state in which each one open end is abutted.

  Further, when the pipe joint 10 as described above is used, as shown in FIG. 5, the exchanged pipe body 14e whose both ends in the axial direction are connected to the continuously used pipe bodies 14c and 14d by the pipe joints 10a and 10b is exchanged. The tube 14f can be replaced. In addition, in FIG. 6 thru | or 8 mentioned later, illustration of the detailed structure of the pipe joint 10a, 10b is abbreviate | omitted.

  First, all the locking cams 32 of the pipe joints 10a and 10b that are externally inserted at both ends in the axial direction of the exchanged pipe body 14e are released from the contact and locking state with respect to the pipe bodies 14c, 14d, and 14e. Moreover, the air with which the working air chamber 22a provided in the pipe joint 10a extrapolated by the butt | matching part of the continuous use pipe body 14c and the to-be-exchanged pipe body 14e is extracted is extracted. Thereby, the close contact state of the annular seal member 18a that is in close contact with the abutting portion between the continuously used tubular body 14c and the exchanged tubular body 14e is released. Moreover, the air with which the working air chamber 22b provided in the pipe joint 10b extrapolated by the butt | matching part of the to-be-exchanged pipe body 14e and the continuous use pipe body 14d is filled is extracted. Thereby, the close contact state of the annular seal member 18b that is in close contact with the abutting portion between the exchanged tube body 14e and the continuously used tube body 14d is released.

  Subsequently, as shown in FIG. 6, the pipe joints 10 a and 10 b that are externally attached to both ends in the axial direction of the exchanged pipe body 14 e are slid and displaced. That is, a pipe joint extrapolation step is performed in which the pipe joints 10a and 10b are slid and displaced outward in the axial direction of the exchanged pipe body 14e so as to be placed only in the continuously used pipe bodies 14c and 14d. Thereafter, as shown in FIG. 7, an exchange tube determination process is performed in which the exchanged tube 14e is moved from between the continuously used tubes 14c and 14d.

  Next, as shown in FIG. 8, the replacement tube body 14f is inserted between the continuous use tube bodies 14c and 14d, and the replacement tube body arranging step is performed in which the open end portions are butted together. From this state, as shown in FIG. 9, the pipe joints 10a and 10b are slid to the replacement pipe body 14f side, and the annular seal member 18a provided on the pipe joint 10a is connected to the continuously used pipe body 14c. Align to the butted portion of the replacement tube 14f. Further, the annular seal member 18b provided in the pipe joint 10b is aligned with the abutting portion between the replacement pipe body 14f and the continuous use pipe body 14d. Then, a tube locking process is performed in which the release pins 58 are removed from all the locking cams 32 provided on the pipe joints 10a and 10b, and the locking cams 32 are brought into contact with and locked to the tubes 14c, 14d, and 14f. To do. The pipe joints 10a and 10b can be easily positioned by marking the outer peripheral surfaces of the replacement pipe body 14f and the continuous use pipe bodies 14c and 14d with a ruled line or the like, and matching the marks. I can do it.

  Thereafter, air is fed into the working air chamber 22a of the pipe joint 10a into which the one continuous use pipe body 14c and the replacement pipe body 14f are inserted from both sides in the axial direction. As a result, the annular seal member 18a is brought into close contact with the outer peripheral surface of the abutting portion between the one continuous use tubular body 14c and the replacement tubular body 14f. In addition, air is fed into the working air chamber 22b of the pipe joint 10b into which the replacement pipe body 14f and the other continuously used pipe body 14d are inserted from both sides in the axial direction. Thereby, the annular seal member 18b is brought into close contact with the outer peripheral surface of the butted portion of the replacement tubular body 14f and the other continuously used tubular body 14d. As a result, the continuously used tubes 14c and 14d and the replacement tube 14f are fluid-tightly connected to each other with the open end portions being in contact with each other.

  Furthermore, if the pipe joint 10 as described above is used, it is not necessary to replace the entire pipe body 14g. Specifically, for example, as shown in FIG. 10, when the tubular body 14g is partially corroded, the tubular body 14g is first cut. An exchange tube that determines the exchanged tube 14h by separating it into a corroded portion (hereinafter referred to as a tube 14h to be replaced) and a portion that is not corroded (hereinafter referred to as a continuously used tube 14i). The body determination process is performed.

  Next, as shown in FIG. 11, a pipe joint extrapolation step of extrapolating the pipe joint 10 to the continuously used pipe body 14 i is performed. After that, as shown in FIG. 12, a replacement tube arrangement process is performed in which the one open end of each of the continuous use tube 14i and the replacement tube 14j is abutted. In addition, in FIG.11 and FIG.12, illustration of the detailed structure of the pipe joint 10 is abbreviate | omitted.

  From this state, as shown in FIG. 13, the pipe joint 10 is slid to the replacement tube body 14j side. That is, the annular seal member 18 provided in the pipe joint 10 is aligned with the abutting portion between the continuous use pipe body 14i and the replacement pipe body 14j. Then, the release pins 58 are removed from all the locking cams 32 provided on the pipe joint 10. As a result, a tube locking process is performed in which the locking cam 32 is brought into contact with and locked to the continuous use tube 14i and the replacement tube 14j. The positioning of the pipe joint 10 can be easily performed by marking the outer peripheral surface of the replacement pipe body 14j or the continuously used pipe body 14i with a ruled line or the like and matching the mark.

  Thereafter, air is fed into the working air chamber 22, and the annular seal member 18 is brought into intimate contact with the abutting portion between the continuously used tubular body 14i and the replacement tubular body 14j from the outer peripheral surface. Thereby, the continuous use pipe body 14i and the exchange pipe body 14j are fluid-tightly connected to each other in a state in which each one open end is abutted.

  In the pipe joint 10 having such a structure, while the locking cam 32 is in contact with and locked to the outer peripheral surface of the pipe body 14, the pipe body 14 is prevented from moving in the drawing direction. The tube body 14 is allowed to move in the insertion direction. Thereby, the two pipe bodies 14 and 14 can be connected only by inserting the pipe body 14 which has not performed any process. As a result, the two tubular bodies 14, 14 can be easily and quickly connected.

  In addition, since the locking engagement state of the locking cam 32 with the tubular body 14 is held by the urging force of the leaf spring 38, the intended pull-out preventing force is stably exhibited. That is, the locking cam 32 is prevented from being separated from the outer peripheral surface of the tube body 14 depending on the orientation of the tube body 14 with respect to gravity, the position where the locking cam 32 is disposed, and the like. Thereby, it becomes possible to stabilize the connection state of the two tubular bodies 14 and 14.

  As mentioned above, although one Embodiment of this invention was explained in full detail, this is an illustration to the last, Comprising: This invention is not limited at all by the specific description in this Embodiment.

  For example, in the above-described embodiment, a hollow tube may be accommodated in the annular recess 16 and the internal space of the hollow tube may be used as the working air chamber 22. Specifically, for example, a seal structure composed of various annular seal members as described in JP-A-2005-16722 can be employed.

  Further, the number and arrangement positions of the locking cams 32 employed are not limited to those described in the embodiment. When the tube diameter is large or when the force acting on the tube is large, it is effective to provide a large number of locking cams. In that case, not only the circumferential cam but also the position different in the axial direction is provided. A locking cam may be provided.

  Furthermore, in the above-described embodiment, the leaf spring 38 may be fixed at one end in the longitudinal direction on the extending end side of the extending piece 24 by locking or the like. A well-known biasing means such as a coil spring can be employed instead of the leaf spring. In the embodiment, the leaf spring 38 may be removed when the release pin 58 is inserted into the pin hole 36.

  Moreover, in the said embodiment, this invention is applicable similarly, also when an exchange pipe body is an elbow pipe, a T-shaped pipe, etc. other than a straight pipe body.

  Moreover, in this invention, since two pipe bodies can be connected without welding etc., the two pipe bodies to be connected do not need to be formed with the same material. For example, a pipe made of a synthetic resin material such as vinyl chloride and a pipe made of a metal material such as aluminum, cast iron, stainless steel, or titanium, or a metal pipe made of different materials You may connect your body.

  In addition, although not listed one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

10: pipe joint, 12: joint housing, 14: pipe body, 18: annular seal member, 28: support wall, 30: support shaft, 32: locking cam, 36: pin hole, 38: leaf spring, 44: positioning Bolt, 58: Release pin

Claims (6)

In a pipe joint in which each open end of two pipe bodies is connected in fluid communication with each other in a butted state, and communicated with each other,
An annular seal member is tightly sealed from the outer peripheral surface to the butted portion of each one of the open ends of the two pipe bodies, and on the both axial sides of the annular seal member, A one-way lock member is provided that allows the tube body to move in the butting direction while preventing the tube body from moving in the opposite direction by being abutted and locked to the outer peripheral surface. A pipe joint comprising biasing means for biasing the lock member toward the pipe body and holding the lock member in a contact locking state with the pipe body.   An annular joint housing in which each open end on the connection side of the two pipe bodies is inserted from both sides in the axial direction is used, and the outer peripheral surface of the pipe body is oscillated around a support shaft provided in the joint housing. A locking cam that is brought into contact with and spaced apart from the cam, and the locking cam constitutes the one-way locking member, and the supporting shaft of the locking cam is arranged on the outer peripheral side of the pipe body. The locking cam extends from the support shaft toward the abutment side opening end of the tube body in parallel with the tangent line, and the lock is positioned on the abutment side opening end side of the tube body from the support shaft. The pipe joint according to claim 1, wherein the working cam is brought into contact with and locked to the outer peripheral surface of the pipe body.   Temporary fixing means for temporarily fixing at least one of the tubular bodies to the joint housing is provided using an annular joint housing in which each opening end portion on the connection side of the two tubular bodies is inserted from both axial sides. The pipe joint according to claim 1 or 2.   The release state maintenance means which cancels | releases the contact locking state to the said pipe body of the said one-way lock member by the said urging | biasing means, and provided the release state maintenance means in any one of Claim 1 thru | or 3. Pipe fittings. In the pipe joint construction method using the pipe joint according to any one of claims 1 to 4,
An exchange tube determining step for determining an exchanged tube to be exchanged for a continuously used tube that is continuously used;
A pipe fitting extrapolation step of extrapolating the pipe joint with respect to any one of the replacement pipe body replaced with the exchanged pipe body and the continuous use pipe body;
A replacement tube arrangement step of abutting each one open end of the continuous use tube and the replacement tube; and
The pipe joint is slid to the other side of the replacement pipe body and the continuous use pipe body, and the opening end portion of the replacement pipe body and the opening end portion of the continuous use pipe body are brought into contact with each other. The annular seal member is extrapolated and the one-way lock member is brought into contact with and locked to the outer peripheral surface of the replacement tubular body on one axial side of the annular seal member. And a tube locking step of bringing the one-way lock member into contact with and engaging with the outer peripheral surface of the continuously used tube on the other side in the direction.   The pipe joint construction method according to claim 5, wherein the replacement pipe body determining step cuts an axial intermediate portion of the specific pipe body and uses one of the cut pipe bodies as the exchanged pipe body.

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