JP4397966B1 - Pipe connection structure - Google Patents

Abstract

Provided is a pipe connection structure capable of maintaining good connection between pipe parts even when the internal pressure in the pipe becomes high.
A prefab tube connecting structure includes a prefab tube main body 101 and a prefab tube 100 including an enlarged diameter portion 102 provided at an end of the prefab tube main body 101, and a prefab tube in which one end is inserted into the enlarged diameter portion 102. 103 and an inner peripheral surface of the enlarged diameter portion 102. The enlarged diameter portion 102 is formed with an insertion hole that communicates with the passage and into which the connecting member 140 is inserted. The connecting member 140 has flexibility. The spherical body includes a core wire and a through hole formed therein, the core wire is inserted into the through hole, and a plurality of spherical bodies arranged on the core wire, and the spherical body has an inner peripheral surface of the enlarged diameter portion 102 that defines the annular recess 112. And the prefabricated pipe 103 and the prefabricated pipe 103 are connected by engaging with the outer peripheral surface of the prefabricated pipe 103 defining the annular recess 104.
[Selection] Figure 2

Description

  The present invention relates to a pipe connection structure that can be used when pipes typically arranged in a building are connected to each other.

  In a building, various piping facilities are generally installed that can circulate fluids such as water and hot water to supply water and hot water. This piping equipment design and installation work is a major factor that affects the quality and construction period of construction work. However, since the majority of the construction period is often spent on building foundation work and steel frame assembly work, in reality, it is required to install the piping equipment within the remaining short period of time. Often.

  Thus, various types of connection structures for various pipes have been proposed. For example, Japanese Utility Model Laid-Open No. 3-130488 discloses a connection structure between a pipe and a joint pipe that receives the pipe. A locking groove is formed at the end of the tube, and an opening is formed in the joint tube at a portion corresponding to the locking groove. Then, the U-shaped locking pin is inserted from the opening of the joint pipe and engaged with the locking groove of the pipe, thereby connecting the pipe and the joint pipe.

  Further, this Japanese Utility Model Laid-Open No. 3-130488 discloses an annular stopper having a claw portion inserted into each opening of the joint pipe as a stopper engaged with the opening of the joint pipe and the locking groove of the pipe. The ingredients are listed. And each claw part engages with each opening part of a joint pipe, and the latching groove of a pipe, and the joint pipe and the pipe are connected.

  The joint mechanism described in Japanese Patent No. 4236033 includes a cylindrical joint body, a stopper member having a shape in which a part of a ring-shaped wire is cut, a pipe to be connected inserted inside the joint body, and this covered body. And an O-ring attached to the outer periphery near the insertion tip of the connecting pipe. And the outer ring groove in which the outer peripheral side edge part of a stopper member is accommodated is formed in the inner peripheral wall of a joint main body, and the stopper member introduction port is formed in the joint main body in which this outer ring groove was formed. .

  This stopper member introduction port is formed wider than the thickness dimension of the wire of the stopper member. Furthermore, an inner ring groove for accommodating the inner peripheral edge of the stopper member is formed at the outer peripheral wall position of the connected pipe farther from the insertion tip side than the O-ring attachment position of the connected pipe. The width dimension of the inner ring groove is formed wider than the thickness dimension of the wire of the stopper member. The stopper member is mounted on the outer peripheral surface of the joint body in a state where a helical twist is applied so that the opposite end portions are slightly misaligned. In addition, the joint structure similar to this joint structure is proposed also in Unexamined-Japanese-Patent No. 2007-270930 and Unexamined-Japanese-Patent No. 2004-239289.

  A pipe joint described in JP 2008-106920 A includes a female member and a male member inserted and connected to the female member. The female member has a cylindrical female main body. The female main body has a male member receiving portion on the front end side and a conduit connecting portion on the rear end side.

  The male member receiving portion is provided with a plurality of locker holes penetrating in the radial direction at predetermined intervals in the circumferential direction of the male member receiving portion. A spherical locker is set in the locker hole and can be displaced in the radial direction.

  A sleeve is attached to the outer periphery of the male member receiving portion. The sleeve can be displaced in the axial direction between a locking position and a locking release position.

  In the locking position, the sleeve presses the locking element radially inward so that the locking element partially protrudes from the inner peripheral surface of the female main body, and in the locking release position, the sleeve The pressing is released, and the locker can be displaced radially outward within the locker hole.

  The male member has a cylindrical male main body. The male main body is formed with an insertion portion that extends from the front end toward the rear end and is inserted into the male member receiving portion of the female main body. When inserted into the member receiving portion, an annular locking recess for receiving the locking element is formed in alignment with the locking element in the radial direction.

Japanese Utility Model Publication No. 3-130488 Japanese Patent No. 4236033 JP 2007-270930 A JP 2004-239289 A JP 2008-106920 A

  However, in the joint described in Japanese Utility Model Laid-Open No. 3-130488, when connecting a pipe and a pipe joint using a U-shaped detachment pin, an opening of the joint pipe and an engagement area of the pin, Both the locking groove of the pipe and the engagement area of the pin are much shorter than the entire circumference of the pipe and the joint pipe.

  Furthermore, even when a pipe and a joint pipe are connected using an annular stopper having a plurality of claw parts, the engagement area of the opening and claw part of the joint pipe, and the engagement area of the engagement groove and claw part Both are much shorter than the entire circumference of the pipe and the joint pipe.

  Thus, since the engagement area | region of a pipe | tube and a joint pipe | tube and a stopper is small, when the internal pressure in a pipe | tube became high pressure, there existed problems, such as a pipe | tube falling out from a joint pipe | tube.

  In the joint mechanism described in the above-mentioned Japanese Patent No. 4236033, when the joint body and the pipe to be connected are connected, the pipe to be connected is inserted into the joint body. Thereafter, the stopper member is sequentially inserted from the stopper member introduction port, and the stopper member is inserted into the inner ring groove and the outer ring groove. The stopper member mounted in the inner ring groove and the outer ring groove is reduced in diameter as compared with the stopper member mounted on the outer peripheral surface of the joint body, and is in a substantially annular state.

  In other words, when the stopper member is mounted on the outer peripheral surface of the joint body, the diameter of the stopper member is increased, and a large surface pressure is generated between the inner peripheral surface of the stopper member and the outer peripheral surface of the joint body. Has occurred.

  For this reason, in order to insert the stopper member into the inner ring groove and the outer ring groove, even if it is attempted to sequentially insert the stopper member portion from the stopper member introduction port, the friction between the stopper member and the joint body is very large. There is a problem that it is very difficult to insert the stopper member into the stopper member introduction port.

  In order to improve the convenience at the time of inserting the stopper portion, it is conceivable to form the stopper member with a thin core wire or the like that can be easily deformed, but it becomes impossible to secure the connection strength between the joint body and the pipe to be connected. For this reason, the stopper member inevitably employs a thick wire. When the ring-shaped stopper member with a part cut away is formed of a wire having a predetermined thickness, the frictional force generated between the outer peripheral surface of the joint body and the stopper member is increased.

  As described above, in the joint mechanism described in the above-mentioned Japanese Patent No. 4236033, both workability when connecting the joint body and the pipe to be connected and strong coupling between the joint body and the pipe to be connected are achieved. Has become difficult.

  In the pipe joint described in Japanese Patent Application Laid-Open No. 2008-106920, a spherical locking element is disposed in a locking hole formed in the male member receiving portion, and the locking element is a female member and a male member. And In order to strengthen the connection between the female member and the male member, it is conceivable to arrange a large number of lockers in the circumferential direction.

  However, in order to arrange a large number of lockers, it is necessary to form a large number of locker holes in the male member receiving part, and it is difficult to ensure the rigidity of the male member receiving part. When the rigidity of the male member receiving portion is lowered, when the internal pressure in the female member and the male member is increased, the upper male member receiving portion is deformed and the coupling between the female member and the male member is released. There is a fear.

  For this reason, in the pipe joint described in Japanese Patent Application Laid-Open No. 2008-106920, it is difficult to make the connection between the pipe portions strong.

  The present invention has been made in view of the problems as described above, and its purpose is to easily connect the tube portions and to connect the tube portions to each other with strength. Is to provide a connection structure.

The connection structure of the pipe part which concerns on this invention is the 1st pipe part containing the enlarged diameter part provided in the edge part of the 1st pipe main body and the 1st pipe main body, and the 2nd pipe by which one end is inserted in an enlarged diameter part Formed on the inner peripheral surface of the enlarged diameter portion, the stopper portion that can be in contact with the opening end portion of the second pipe portion, and the enlarged diameter portion of the enlarged diameter portion. In the state where the first annular recess extending in the circumferential direction and the second tube portion are inserted into the enlarged diameter portion, the second tube is formed on the outer peripheral surface of the second tube portion facing the first annular recess. A second annular recess extending in the circumferential direction of the portion, a first annular recess and a second annular recess are inserted into an insertion passage formed by arranging in a radial direction, and the first pipe portion and the second pipe portion are And a connecting member to be connected. The enlarged diameter portion is formed with an insertion hole through which the outside of the enlarged diameter portion communicates with the insertion passage and into which the connecting member is inserted. The connecting member includes a flexible core wire and a first through hole. is formed, is inserted core wire to the first through hole, a spherical body in which a plurality in the extending direction of the core wire, and a fixing portion one end of the core wire is inserted, is fixed to the other end portion of the core wire and a locking end portions, the coupling member, by being inserted into the insertion path, is configured to be curved along the insertion path. The spherical body is prevented from falling off from the core wire by the fixing portion and the locking end portion, and is provided rotatably on the core wire, and the connecting member is inserted into the insertion passage to define the first annular recess. The first pipe part and the second pipe part are connected by engaging the inner peripheral surface of the enlarged diameter part and the outer peripheral surface of the second pipe part that defines the second annular recess. The fixing portion includes a grip portion formed in a hollow shape and a first screw portion that is connected to the grip portion and has a second through hole into which a core wire is inserted. In the grip portion, one end of the core wire is fixed and a locking portion is provided rotatably in the grip portion. A step portion and a step portion are provided on the inner peripheral surface of the insertion hole. A second screw portion located on the side of the first annular recess, and a communication path extending from the second screw portion toward the first annular recess and reaching the first annular recess are formed. After the connecting member is inserted from the insertion hole and the connecting member is disposed in the insertion passage, the gripping portion is rotated, the first screw portion is screwed to the second screw portion, and the fixing portion becomes the enlarged diameter portion. The connecting member is disposed over the entire circumference of the insertion passage .

Preferably, the core wire has a circular cross-sectional shape, and the diameter of the core wire is formed to be smaller than the thickness of the second tube portion, and the spherical body has an annular shape in a cross section perpendicular to the extending direction of the core wire. is a radius of the outer circumferential surface of the spherical body is formed to be larger than the thickness of the second tubular portion. Of the expanded diameter portion, the thickness of the portion where the first annular recess is located is formed to be thicker than the radius of the spherical body .

  According to the connection structure of a pipe part concerning the present invention, even if the internal pressure in the pipe becomes high, the connection between the pipe parts can be maintained well, and the connection work of the pipe part is reduced. .

It is the side view which carried out the cross sectional view of a part of piping unit 500 provided with pipe part connection structure 200 concerning this Embodiment 1. FIG. It is the side view which looked at a part of pipe part connection structure 200 in cross section. It is the front view which looked at a part of pipe part connection structure 200 in cross section. 4 is a side sectional view of an enlarged diameter portion 102. FIG. 3 is a cross-sectional view of an enlarged diameter portion 102. FIG. 3 is a cross-sectional view of a prefabricated tube 103. FIG. 4 is a side view of a connecting member 140. FIG. FIG. 6 is a front view showing a state in which a connecting member 140 is inserted into an insertion passage 115. FIG. 6 is a cross-sectional view showing a spherical body 146 and its vicinity in a state where a connecting member 140 is inserted into an insertion passage 115. It is sectional drawing which shows the modification of the shape of the annular recessed part. FIG. 11 is a side view showing a modified example of the connecting member 140. FIG. 10 is a cross-sectional view showing another modification of the connecting member 140. FIG. 12 is a side view showing still another modified example of the connecting member 140. FIG. 12 is a side view showing still another modified example of the connecting member 140.

  The connection structure of the prefabricated pipe (pipe part) according to the present invention will be described with reference to FIGS. FIG. 1 is a side view of a part of a piping unit 500 provided with the pipe connection structure 200 according to the first embodiment.

  As shown in FIG. 1, the piping unit 500 is configured by connecting a plurality of prefabricated pipes (pipe parts) 100 and 103 to each other by a pipe part connection structure 200. In addition, the piping unit 500 constructed by a plurality of prefabricated pipes as described above is housed in a construction, for example, and used as a water supply piping facility or a hot water supply piping facility.

  FIG. 2 is a side view of a part of the pipe connection structure 200 as a cross-sectional view, and FIG. 3 is a front view of a part of the pipe connection structure 200 as a cross-section. As shown in FIGS. 2 and 3, the pipe connection structure 200 includes a prefabricated pipe body 101 and a prefabricated pipe 100 having an enlarged diameter portion 102 provided at an end of the prefabricated pipe main body 101, and an open end 111. A prefabricated tube 103 inserted into the enlarged diameter portion 102 is connected.

  The diameter of the inner surface of the enlarged diameter portion 102 is larger than the diameter of the inner surface of the prefabricated pipe body 101. And the end part by the side of the opening end part 111 among the prefabricated pipes 103 is inserted into the enlarged diameter part 102. Since the inner diameter of the enlarged diameter portion 102 is larger than the inner diameter of the prefabricated pipe main body 101, a stepped portion (stopper) 108 is formed between the enlarged diameter section 102 and the prefabricated pipe main body 101.

  The inner diameter of the step portion 108 is smaller than the outer diameter of the opening end portion 111 of the prefabricated tube 103, and when the prefabricated tube 103 is inserted into the enlarged diameter portion 102, the stepped portion 108 has an opening end portion of the prefabricated tube 103. 111 abuts, and relative positioning of the prefabricated pipe 100 and the prefabricated pipe body 101 is performed.

  An annular concave portion 112 extending along the circumferential direction of the enlarged diameter portion 102 is formed on the inner peripheral surface of the enlarged diameter portion 102. In a state where the prefabricated tube 103 is inserted into the enlarged diameter portion 102, an annular recessed portion 104 is formed on the outer peripheral surface of the prefabricated tube 103 at a portion facing the annular recessed portion 112 in the radial direction.

  As shown in FIG. 3, the annular recess 112 and the annular recess 104 are arranged in the radial direction to form an insertion passage 115 extending in an annular shape. In the enlarged diameter portion 102, an insertion hole 114 that reaches the insertion passage 115 from the outer peripheral surface of the enlarged diameter portion 102 and communicates with the insertion passage 115 is formed. A connecting member 140 is inserted into the insertion hole 114 and the insertion passage 115.

  FIG. 4 is a side sectional view of the enlarged diameter portion 102. As shown in FIG. 4, a seal housing groove 110 extending in an annular shape is formed in a portion of the inner peripheral surface of the enlarged diameter portion 102 located on the side opposite to the opening end portion 113 with respect to the annular recess 112. Yes. In the seal housing groove 110, a seal member 107 is housed as shown in FIG.

  The seal member 107 is formed in an annular shape, and the seal member 107 comes into contact with the outer peripheral surface of the prefabricated pipe 103 inserted into the enlarged diameter portion 102, so that the liquid flowing in the prefabricated pipes 100, 103, etc. Leakage from between the prefabricated pipe 100 and the prefabricated pipe 103 is suppressed.

  A rib 118 is formed on a portion of the outer peripheral surface of the enlarged diameter portion 102 located on the radially outer side of the annular recess 112, and the rib 118 is formed on the outer peripheral surface of the enlarged diameter portion 102 in the circumferential direction. A plurality are formed at intervals.

  By this rib 118, the rigidity of the portion located around the annular recess 112 in the enlarged diameter portion 102 is enhanced.

  Further, the thickness t1 of the enlarged diameter portion 102 is thicker than the thickness t2 of the prefabricated pipe main body 101 shown in FIG. 2, and the rigidity of the enlarged diameter section 102 is higher than that of the prefabricated pipe main body 101.

  FIG. 5 is a cross-sectional view of the enlarged diameter portion 102 taken along the line VV in FIG. 4. As shown in FIG. 5, the enlarged diameter portion 102 reaches the annular recess 112 from the outer peripheral surface of the enlarged diameter portion 102. An insertion hole 114 is formed. The insertion hole 114 has a stepped portion 121, a screw portion 120 formed on the inner peripheral surface located on the annular recess 112 side from the stepped portion 121, and extends from the screw portion 120 toward the annular recess 112. And a communication path 122 reaching 112.

  FIG. 6 is a cross-sectional view of the prefabricated tube 103. As shown in FIG. 6, the annular recess 104 is formed in a semicircular arc shape.

  FIG. 7 is a side view of the connecting member 140. As shown in FIG. 7, the connecting member 140 includes a flexible core wire 145 and a spherical body 146 in which a through hole 148 is formed, the core wire 145 is inserted, and a plurality of spherical bodies 146 are arranged on the core wire 145. ing. In FIG. 7, some of the spherical bodies 146 are omitted. A plurality of spherical bodies 146 are arranged from one end side to the other end side of the core wire 145. Note that the spherical bodies 146 are arranged so that a slight gap is formed between the spherical bodies 146 when the connecting member 140 is extended linearly. For this reason, the connecting member 140 can be deformed so as to be curved.

  As the core wire 145, a wire having a circular cross-sectional shape is employed. The diameter R3 of the core wire 145 is formed to be smaller than the thickness t3 of the prefabricated tube 103 shown in FIG. Since such a thin wire is employed, the operator can bend and deform the connecting member 140 with a small force. Furthermore, the core wire 145 is formed of a metal wire that is linear as shown in FIG. 7 when no external force is applied. For this reason, the connection member 140 in an unloaded state before mounting is also formed to extend linearly.

  The connecting member 140 includes a fixed portion 150 in which one end portion of the core wire 145 is locked, and a lock end portion 147 fixed to the other end portion of the core wire 145 by welding or the like. A plurality of spherical bodies 146 are arranged between the fixed portion 150 and the locking end portion 147, and the spherical body 146 is prevented from falling off from the core wire 145 by the fixing portion 150 and the locking end portion 147. .

  The fixing portion 150 includes a hollow gripping portion 141, a screw portion 142 connected to the gripping portion 141 and having a through-hole into which the core wire 145 is inserted, and a cylinder connected to the screw portion 142. The cylindrical part 143 is provided.

  A spherical locking portion 149 fixed to the end of the core wire 145 is inserted into the gripping portion 141, and the locking portion 149 engages with the gripping portion 141, whereby the core wire 145 and the fixed portion are inserted. 150 is connected. The locking portion 149 is rotatably provided in the grip portion 141, and the core wire 145 is rotatably provided on the fixed portion 150.

  When connecting the prefabricated tube 103 and the prefabricated tube 100, one end of the prefabricated tube 103 is inserted into the enlarged diameter portion 102 of the prefabricated tube 100. When the prefabricated tube 103 is inserted into the enlarged diameter portion 102, the end portion of the prefabricated tube 103 comes into contact with the stepped portion 108 shown in FIG. 2, and the prefabricated tube 100 and the prefabricated tube 103 are positioned.

  When the prefabricated tube 103 and the prefabricated tube 100 are relatively positioned, the annular recess 112 and the annular recess 104 are arranged in the radial direction, and the insertion passage 115 is formed. After that, as shown in FIG. 8, one end of the connecting member 140 is inserted into the communication path 122.

  At this time, the connecting member 140 is formed so as to extend linearly in a natural state (an unloaded state where no load is applied from the outside), so that the positioning of the tip of the connecting member 140 is relatively easy. It can be carried out. Then, after the positioning of the distal end portion of the connecting member 140 is completed, the operator sequentially inserts the distal end portion of the connecting member 140 into the communication path 122. Then, by sequentially inserting the connection member 140 into the communication path 122, the connection member 140 is curved along the shape of the insertion path 115 as shown in FIG. Get in.

  Since a thin metal wire is used as the core wire 145 of the connecting member 140 and the connecting member 140 can be bent with a small external force, the operator applies the connecting member 140 in the insertion passage 115 sequentially by applying a relatively small force. Can be inserted into. As shown in FIG. 3, when the attachment of the connecting member 140 is completed, the connecting member 140 is disposed over substantially the entire circumference of the insertion passage 115.

  Thereafter, by rotating the gripping portion 141 of the connecting member 140, the screw portion 142 and the screw portion 120 are screwed together, and the fixing portion 150 is fixed to the enlarged diameter portion 102. Thereby, the mounting of the connecting member 140 is completed.

  When the mounting of the connecting member 140 is completed, the spherical body 146 of the connecting member 140 engages with the inner peripheral surface of the enlarged diameter portion 102 that defines the annular recess 112 and the outer peripheral surface of the prefabricated tube 103 that defines the annular recess 104. . Thereby, the prefabricated pipe 100 and the prefabricated pipe 103 are connected.

  When the internal pressure in the prefabricated pipe 100 and the prefabricated pipe 103 rises, a load is applied to the prefabricated pipe 100 and the prefabricated pipe 103 in a direction in which the prefabricated pipe 103 is removed from the enlarged diameter portion 102.

  At this time, since the plurality of spherical bodies 146 receive the load applied to the prefabricated pipe 100 and the prefabricated pipe 103, the spherical bodies 146 themselves can be prevented from being deformed or broken.

  Furthermore, by connecting the prefabricated tube 100 and the prefabricated tube 103 via a plurality of spherical bodies 146, the contact points between the spherical body 146, the prefabricated tube 100, and the prefabricated tube 103 increase, and each spherical body 146 and the prefabricated tube 103 are connected. The contact area between the tube 100 and the prefabricated tube 103 is increased. Accordingly, even if the load applied to the prefabricated tube 100 and the prefabricated tube 103 is increased in the direction in which the prefabricated tube 103 is removed from the enlarged diameter portion 102, each contact point between the spherical body 146, the prefabricated tube 100 and the prefabricated tube 103. It can suppress that the surface pressure in becomes excessive.

  Thereby, it can suppress that the prefabricated pipe 100 and the prefabricated pipe 103 are deformed or cracked, and the connection state between the prefabricated pipe 100 and the prefabricated pipe 103 can be favorably maintained. The spherical body 146 is made of a metal material such as steel.

  The arc-shaped inner surface of the annular recess 104, the diameter of the spherical body 146, and the radius of the arc-shaped inner surface of the annular recess 112 may substantially coincide with each other, as shown in FIG. As described above, each radius may be set. FIG. 9 is a cross-sectional view showing the spherical body 146 and its vicinity in a state where the connecting member 140 is inserted into the insertion passage 115.

  As shown in FIG. 9, the radius r1 of the spherical body 146 is smaller than the curvature radii r2 and r3 of the inner surfaces of the annular recesses 104 and 112. For this reason, when the spherical body 146 is in contact with the inner surface of the annular recess 112, a gap is generated between the spherical body 146 and the annular recess 104. Thus, since the cross-sectional area of the insertion passage 115 defined by the annular recess 104 and the annular recess 112 is larger than the cross-sectional area of the spherical body 146, the connecting member 140 can be easily inserted into the insertion passage 115. Further, when the connecting member 140 is inserted into the insertion passage 115, the annular recess 112 and the annular recess 104 are not accurately arranged in the radial direction, and the annular recess 112 and the annular recess 104 are not aligned with the prefabricated tubes 100, 103. Even if the connecting member 140 is slightly shifted in the extending direction, the connecting member 140 can be easily inserted into the insertion passage 115, and the efficiency of the connection work between the prefabricated pipe 100 and the prefabricated pipe 103 can be improved. ing.

  Here, the core wire 145 of the connecting member 140 is formed to be linear in the natural state. For this reason, in a state where the connecting member 140 is inserted into the insertion passage 115 and is curved, an urging force is generated on the core wire 145 so as to return to the linear shape. Thereby, the core wire 145 presses the spherical body 146 against the inner peripheral surface of the enlarged diameter portion 102 that defines the annular recess 112, and the spherical body 146 enters the annular recess 112.

  As shown in FIG. 9, the spherical body 146 is formed to be annular in the cross section perpendicular to the extending direction of the core wire 145, and the outer peripheral surface of the spherical body 146 is formed to be circular. ing. The radius r1 of the outer peripheral surface of the spherical body 146 is formed to be thicker than the thickness t3 of the prefabricated tube 103. The rigidity of the spherical body 146 is higher than that of the prefabricated tube 103, and the deformation of the spherical body 146 is suppressed. On the other hand, the radial thickness t1 of the portion where the enlarged diameter portion 102 and the annular recess 112 are located is formed so as to be thicker than the radius r1 of the spherical body 146. The rigidity is higher than that of the prefabricated tube 103. For this reason, even if the internal pressure in the prefabricated tubes 100 and 103 increases, the deformation of the enlarged diameter portion 102 is suppressed.

  And even if the internal pressure in the prefabricated tubes 100 and 103 rises, the enlarged diameter portion 102 hardly deforms. On the other hand, the prefabricated tube 103 is deformed so as to expand its diameter. At this time, since the prefabricated tube 103 is more easily deformed than the enlarged diameter portion 102, the inner surface of the annular recess 104 is deformed so as to be in close contact with the outer peripheral surface of the spherical body 146 located in the annular recess 112.

  As a result, the inner surface of the annular recess 104 and the outer peripheral surface of the spherical body 146 are in close contact with each other, and the spherical body 146 enters the annular recess 112, so that the prefabricated pipe 100 and the prefabricated pipe 103 are more coupled. It will be solid. The spherical body 146 enters the annular recess 112 that is difficult to be deformed by the urging force of the core wire 145, so that even if the prefabricated tube 103 is deformed, the spherical body 146 is prevented from falling off.

  Furthermore, by providing the rib 118 formed in the enlarged diameter portion 102 or increasing the thickness of the rib 118, the rigidity of the enlarged diameter portion 102 can be increased, and the gap between the spherical body 146 and the enlarged diameter portion 102 can be increased. Even if a large surface pressure is generated, deformation of the enlarged diameter portion 102 can be suppressed. Thereby, the connection state of the prefabricated pipe 100 and the prefabricated pipe 103 can be maintained. The radius r1 of the spherical body 146 is a small sphere smaller than the thickness t1 of the enlarged diameter portion 102. By adopting such small spheres, a large number of spherical bodies 146 can be arranged on the annular recess 104 and the annular recess 112 in a state where the connecting member 140 is mounted.

  FIG. 10 is a cross-sectional view showing a modification of the shape of the annular recess 112. In the example shown in FIG. 10, the inner surface of the annular recess 112 is formed by a curved surface 112a centered on the center point O4 and a curved surface 112b centered on the center point O5. The center point O4 and the center point O5 are separated in the extending direction of the prefabricated tube 103.

  The curvature radii r4 of the curved surfaces 112a and 112b are both longer than the radius r1 of the spherical body 146. In the annular recess 112 shown in FIG. 10, the curved surfaces 112 a and 112 b rise steeply from the bottom of the annular recess 112, so that the spherical body 146 is difficult to drop off from the annular recess 112.

  As described above, according to the pipe part connection structure 200 according to the present embodiment, the prefabricated pipe 103 is inserted into the enlarged diameter part 102 of the prefabricated pipe main body 101, and the connecting member 140 is inserted into the insertion passage 115 from the insertion hole 114. After the insertion, by rotating the gripper 141, the connection work between the prefab tube 100 and the prefab tube 103 can be completed, and the connection work between the prefab tube 100 and the prefab tube 103 can be simplified. it can. Furthermore, according to the pipe part connection structure 200 according to the present embodiment, even if the internal pressure in the prefabricated pipes 100 and 103 is increased, the connection between the prefabricated pipes 100 and 103 can be favorably maintained.

  As shown in FIG. 3, the cylindrical portion 143 of the connecting member 140 is located in the communication path 122, and the cylindrical portion 143 is not engaged with the annular recess 104 of the prefabricated tube 103. Therefore, by forming the cylindrical portion 143 with a material cheaper than the spherical body 146, the manufacturing cost of the connecting member 140 can be reduced.

  FIG. 11 is a side view showing a modified example of the connecting member 140. In the example shown in FIG. 11, a hollow cylindrical tubular member 151 is disposed between the spherical bodies 146. The diameter R2 of the cylindrical member 151 is smaller than the diameter R1 of the spherical body 146.

In a state where the connecting member 140 is inserted into the insertion passage 115, the fixing portion 150 hardly contacts the inner surface of the enlarged diameter portion 102 that defines the annular recess 112 and the inner surface of the prefabricated tube 103 that defines the annular recess 104. . For this reason, the load applied to the cylindrical member 151 is smaller than the load applied to the spherical body 146, and the cylindrical member 151 hardly contributes to the engagement between the prefabricated tube 100 and the prefabricated tube 103. .

  For this reason, the manufacturing cost of the connection member 140 can be reduced by forming the cylindrical member 151 with an inexpensive material. Furthermore, by arranging the cylindrical member 151 between the spherical bodies 146, the intervals between the spherical bodies 146 can be made uniform.

  FIG. 12 is a cross-sectional view showing another modification of the connecting member 140. The example shown in FIG. 12 is a cross-sectional view showing an example in which cylindrical members 152 are arranged. As described above, the engaging portion that engages the prefabricated tube 100 and the prefabricated tube 103 is a member that has an annular cross section perpendicular to the center line of the core wire 145, and is provided rotatably on the core wire 145. Any member may be used. And the radius which prescribes | regulates the outer peripheral surface of an engaging part toward the extending | stretching direction of the core wire 145 is changed sequentially, or is maintained constant. For example, by changing the radius sequentially in the extending direction of the core wire 145, it becomes a spherical body or becomes constant by becoming constant.

  In addition, in FIG. 1 to FIG. 12, the case where the connecting member 140 is linear in a no-load state has been described, but the present invention is not limited to this.

  FIG. 13 is a side view showing the connecting member 140 formed in a curved shape in an unloaded state. In the example shown in FIG. 13, the connecting member 140 is curved so that at least a part thereof has a curvature radius R5 in the unloaded state.

  The curvature radius R <b> 5 is formed to be larger than the radii of the enlarged diameter portion 102 and the prefabricated tube 103. When the connecting member 140 shown in FIG. 13 is inserted from the insertion hole 114 and the prefabricated tube 103 and the enlarged diameter portion 102 are connected, the connecting member 140 presses the spherical body 146 against the annular recess 112 of the enlarged diameter portion 102.

  By pressing the spherical body 146 against the annular recess 112, it is possible to obtain the same effect as that of the connecting member 140 shown in FIG.

  FIG. 14 shows a modification of the connecting member 140 shown in FIG. 11, and the connecting member 140 shown in FIG. 14 is also formed so as to be bent in an unloaded state as shown in FIG.

  For this reason, the connecting member 140 shown in FIG. 14 can also obtain the same effects as the connecting member 140 shown in FIG.

  Although the connecting members 140 shown in FIGS. 7, 11 and 12 are formed in a straight line, these connecting members 140 have a radius of curvature that is far greater than the radius of the enlarged diameter portion 102 and the prefabricated tube 103. This is a large setting.

  In other words, by making the radius of curvature of the connecting member 140 larger than that of the enlarged-diameter portion 102 and the prefabricated tube 103, the spherical body 146 is deformed by the urging force of the core wire 145 when the connecting member 140 is inserted into the insertion passage 115. The annular recess 112 of the enlarged diameter portion 102 can be pressed.

  Thereby, even if the internal pressure of the prefabricated pipe main bodies 101 and 103 increases as described above, the connected state of the prefabricated pipe main body 101 and the prefabricated pipe 103 can be maintained.

  In the present embodiment, the example in which the connection structure of the pipe portion according to the present invention is applied to the connection structure of the prefabricated pipe has been described. However, the present invention is not limited to the prefabricated pipe and is applicable to the connection structure of other pipe parts. can do.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention is suitable for a pipe connection structure.

  100, 103 Prefab tube, 101 Prefab tube main body, 102 Expanded portion, 104a, 104b Curved surface, 104, 112 Annular recess, 107 Seal member, 108 Step portion, 110 Seal receiving groove, 111 Open end, 113 Open end , 114 Insertion hole, 115 Insertion passage, 118 Rib, 120 Screw part, 121 Step part, 122 Communication path, 140 Connecting member, 141 Gripping part, 142 Screw part, 143 Tube part, 145 Core wire, 146 Spherical body, 147 Locking End part, 148 through-hole, 149 locking part, 150 fixing part, 151 cylindrical member, 200 pipe part connection structure.

Claims (2)

A first pipe body including a first pipe main body and an enlarged diameter portion provided at an end of the first pipe main body;
A second pipe part, one end of which is inserted into the enlarged diameter part,
A stopper portion that is formed between the enlarged diameter portion and the first tube main body and is capable of contacting the open end portion of the second tube portion;
A first annular recess formed on an inner peripheral surface of the enlarged diameter portion and extending in a circumferential direction of the enlarged diameter portion;
In the state where the second pipe portion is inserted into the enlarged diameter portion, the outer peripheral surface of the second pipe portion is formed at a portion facing the first annular recess, and is formed in the circumferential direction of the second pipe portion. A second annular recess extending;
A connecting member that is inserted into an insertion passage formed by arranging the first annular recess and the second annular recess in a radial direction, and connects the first tube portion and the second tube portion;
With
The enlarged diameter portion is formed with an insertion hole through which the outside of the enlarged diameter portion communicates with the insertion passage and into which the connecting member is inserted.
The connecting member comprises a core wire having flexibility, the first through hole is formed, the core wire to the first through hole is inserted, and a spherical body in which a plurality in the extending direction of the core wire, the core wire and one end fixing part which is inserted, and a second end portion which is fixed to the engaging end portion of the core wire, said connecting member by being inserted into the insertion passage, the insertion passage Bendable along the
The spherical body is prevented from falling off from the core wire by the fixing portion and the locking end portion, and is provided rotatably on the core wire, and the connecting member is inserted into the insertion passage, The first tube portion and the second tube portion are engaged with an inner peripheral surface of the enlarged diameter portion defining the first annular recess and an outer peripheral surface of the second tube portion defining the second annular recess. And
The fixing portion includes a grip portion formed in a hollow shape, and a first screw portion that is connected to the grip portion and has a second through hole into which the core wire is inserted.
In the gripping portion, the one end portion of the core wire is fixed, and a locking portion provided to be rotatable in the gripping portion is provided,
The inner circumferential surface of the insertion hole has a stepped portion, a second screw portion located on the first annular recess side from the stepped portion, and extends from the second screw portion toward the first annular recess, A communication path reaching the first annular recess is formed,
After inserting the connecting member from the insertion hole and disposing the connecting member in the insertion passage, the gripping portion is rotated to screw the first screw portion into the second screw portion, A pipe connecting structure in which a fixing portion is fixed to the enlarged diameter portion, and the connecting member is disposed over the entire circumference of the insertion passage . The core wire has a circular cross-sectional shape, and the diameter of the core wire is formed to be smaller than the thickness of the second tube portion ,
The spherical body is an annular in a cross section perpendicular to the extending direction of the core wire, the radius of the outer circumferential surface of the spherical body is formed to be larger than the thickness of said second tubular portion,
2. The pipe connection structure according to claim 1, wherein a thickness of a portion of the enlarged diameter portion where the first annular recess is located is formed to be thicker than the radius of the spherical body .

Images