JP4349892B2 - Pipe connection structure - Google Patents

Description

  The present invention relates to a pipe connection structure for connecting a receiving pipe part and an insertion pipe part in a sealed state so as to be detachable from a pipe axis direction in the middle of a piping route of a fluid transport pipe such as a water pipe or a gas pipe. .

  In the conventional pipe connection structure, between the outer peripheral surface of the insertion tube portion inserted and connected to the reception tube portion from the tube axis direction in the annular groove formed on the inner peripheral surface of the reception tube portion. A sealing elastic sealing material to be compressed in the mounting portion is mounted, and engaging portions protruding radially outward are formed at a plurality of locations in the circumferential direction of the outer peripheral surface of the insertion tube portion. Detachable recesses that allow the insertion / removal movement in the tube axis direction of each locking part of the insertion tube part and locking parts inserted through each of the demounting recesses at a plurality of locations in the circumferential direction of the end of the tube part When the shaft is rotated around the tube axis, a retaining wall portion is formed which comes into contact with the locking portion from the direction of the tube axis and prevents it from moving out.

  In addition, each locking portion of the insertion tube portion and each retaining wall portion of the reception tube portion span the bracket provided on the outer peripheral surface of the reception tube portion and the bracket provided on the outer peripheral surface of the insertion tube portion. Bolts and nuts are provided to fix and connect the two pipe parts from the pipe axis direction in the retaining region where the and the pipes contact with each other in the pipe axis direction. The hole was configured as a long hole that allowed relative rotation within a certain range around the tube axis direction between both tube portions (see Patent Document 1).

Japanese Patent Laid-Open No. 2003-166682

In the conventional pipe connection structure, both pipe parts are moved relatively close to each other in the axial direction of the pipe while the phases of the desorption recesses of the receiving pipe part and the locking parts of the insertion pipe part are matched, When the respective locking parts are inserted into the receiving pipe parts through the recesses, the both pipe parts can be fitted and connected in a sealed state by relatively rotating the pipe parts around the tube axis. The workability at the construction site can be improved as compared to the case where the ends of both pipe portions are flange-joined via a large number of bolts and nuts.
However, even in the retaining state in which each locking portion of the insertion tube portion and each retaining wall portion of the receiving tube portion abut, each retaining portion and each retaining wall portion of the receiving tube portion are connected to the tube shaft. Since it is in a state in which it can rotate freely while sliding around the core, the bracket provided on the outer peripheral surface of the receiving pipe portion and the bracket provided on the outer peripheral surface of the inlet pipe portion are connected to each of the inlet pipe portions. It is necessary to fix and connect from the tube axis direction with bolts and nuts in the retaining area where the stopper part and each retaining wall part of the receiving pipe part abut in the tube axis direction. At the same time, brackets, bolts and nuts project outside, which is likely to be a factor that imposes construction restrictions.

  The present invention has been made in view of the above-described situation, and the main problem is that both pipe parts are sealed with a relative proximity movement operation and a relative rotation operation in the tube axis direction of both pipe parts. Therefore, it is possible to provide a pipe connection structure that can be efficiently and reliably and easily fitted and connected, and can be configured compactly as a whole.

The structure of the tube connection structure is an elastic sealing material for sealing that is compressed between the inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion that is inserted and connected to the inner peripheral surface from the tube axis direction. Is attached to the outer peripheral surface of the insertion tube portion, and a locking portion projecting radially outward is formed on the outer peripheral surface of the insertion tube portion. Detachable recess that allows insertion / removal movement in the direction, and when the locking part inserted through the mounting / removal recess is rotated around the tube axis, it moves out of contact with the locking part from the tube axis direction. A pipe connection structure formed with a retaining wall portion for preventing
When the locking portion inserted into the receiving tube portion through the demounting recess is rotated to the retaining operation position along the rotation operation path, it enters the exit side in the tube axis direction from the rotation operation path. A receiving means may be provided that can freely receive the locking portion at the position and prevent or suppress the rotation of the locking portion toward the detachable recess at the receiving position .

According to the above configuration, when fitting and connecting the receiving tube portion and the insertion tube portion in a sealed state, the phases of the recess of the receiving tube portion and the locking portion of the insertion tube portion are matched. By moving both pipe parts relatively close to each other from the pipe axis direction, and when the locking part is inserted into the receiving pipe part through the detachable recess, both pipe parts are operated to rotate around the pipe axis core. The locking portion of the insertion tube portion and the retaining wall portion of the receiving tube portion are in a retaining state in which they can come into contact with each other from the tube axis direction.

  At this time, by receiving the locking portion rotated to the removal operation position along the rotation operation path by the receiving means at a position entering the withdrawal side in the tube axis direction from the rotation operation path. The rotation of the locking portion toward the detachable recess can be prevented or suppressed.

  Therefore, in a state in which the locking portion of the insertion tube portion rotated to the retaining operation position of the pivoting operation path is received by the receiving means, the engagement received at this retaining operation position. The stop portion cannot be rotated to the attachment / detachment operation position facing the attachment / detachment recess.

  Accordingly, both the pipe parts can be efficiently and surely fitted and connected in a sealed state by the relative proximity movement operation in the pipe axis direction of both pipe parts and the relative rotation operation around the pipe axis core. Since there is no member projecting to the outer peripheral surface side of the receiving tube portion and the insertion tube portion, the entire tube connection structure can be configured in a compact manner.

The structure of the pipe connection structure may be provided with an urging means for moving and urging the locking portion to the receiving position of the receiving means.

According to the above configuration, the engaging portion of the insertion tube portion rotated to the retaining operation position of the pivoting operation path can be biased and maintained at the receiving position of the receiving means, so that an external force is applied. However, it is possible to prevent the locking part in the receiving position from moving to the rotation operation path side, and to fit and connect both pipes while simplifying the fitting and connecting work and improving efficiency. Can be kept strong in state.

Configuring the pipe connection structure, the receiving means, the locking portion in the retainer operating position of the rotating operation passage is formed in the retaining wall at a relatively engagement enterable state from the pipe axis direction You may be comprised from the recessed part.

According to the above-described configuration, the locking portion can be used to construct the receiving means for strongly maintaining the fitting and connecting state of both the pipes while simplifying and improving the efficiency of the fitting and connecting work of both the pipes. Since it is only necessary to form a recess that can be relatively engaged from the axial direction in the retaining wall portion, the structure can be simplified and the manufacturing cost can be reduced.

Configuring the pipe connection structure, the receiving means, retaining walls in retaining the operating position of the rotating operation passage is formed in the locking part with a relatively engagement enterable state from the pipe axis direction You may be comprised from the recessed part.

According to the above configuration, the retaining wall portion is also used in configuring the receiving means for maintaining the fitting connection state of both the pipes while simplifying and improving the efficiency of the fitting connection work of both the pipe portions. Since it is only necessary to form a recess that can be relatively engaged from the tube axis direction in the locking portion, the structure can be simplified and the manufacturing cost can be reduced.

Configuring the pipe connection structure, the receiver pipe portion abuts against the front end surface and the pipe axis direction of the engaging portion inserted through the desorption recess, guides the turning operation along the rotating operation passage guide wall portion may be formed to.

According to the above configuration, when fitting and connecting the receiving tube portion and the insertion tube portion in a sealed state, until the distal end surface of the locking portion of the insertion tube portion contacts the guide wall portion of the receiving tube portion After pushing the locking part in the tube axis direction through the detachable recess, it is only necessary to relatively rotate both pipe parts along the guide wall part, and the fitting connection work of both pipe parts can be performed more efficiently. It can be done easily.

Configuring the pipe connection structure, to a portion corresponding to the retaining operation position of the guide wall portion, for off restrain that allows enter movement in the pipe axis direction inner side than the rotating operation passage of the locking portion recesses may be formed.

According to the above configuration, when the locking portion of the insertion tube portion rotated to the retaining operation position of the rotation operation path is received by the receiving means, the locking portion receives the receiving means. When an external force in the direction of the tube axis that disengages from the position acts on both pipes, the locking part that has come out of the receiving position by the external force at that time enters the recess for checking the slippage of the guide wall and moves to lock. The rotation of the part toward the detachable recess is prevented or suppressed.

  Therefore, even if an external force is applied in the direction in which the locking part is separated from the receiving position, the locking part instantaneously stops and is detached in the rotation operation path between the receiving position and the detachment check recess. The probability of turning to the concave portion is extremely small, and the anti-separation function of both pipes that are fitted and connected can be enhanced.

Configuring the pipe connection structure, the urging means is constituted by utilizing the elastic restoring force of the elastic sealing member is compressed between the inner and outer circumferential surfaces of the inserted pipe portion of the receiving pipe section It may be .

According to the above configuration, the elastic restoring force of the elastic seal material that seals between the inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion is used to set the rotation operation path to the retaining operation position. Since the engaging portion of the rotated insertion tube portion can be moved and urged toward the receiving position of the receiving means, an elastic urging member constituting the urging means is unnecessary, and the receiving port Special processing for attaching the elastic biasing member to the tube portion or the insertion tube portion is not required, and the tube connection structure can be simplified and the manufacturing cost can be reduced.

Configuring the pipe connecting structure, said biasing means, and from the distal end surface and the pipe axis direction of the engaging portion inserted through the desorption recess contact to guide the rotating operation in pipe axis around receiving Of the guide wall portion of the mouth tube portion, the portion corresponding to the retaining operation position is elastically compressed by abutment with a locking portion that is rotated from the detaching operation position to the retaining operation position of the rotation operation path. the resilient biasing body may be constructed by providing to be.

According to the above configuration, the locking portion of the insertion tube portion inserted into the attachment / detachment operation position of the rotation operation path through the attachment / detachment recess of the receiving tube portion is rotated to the retaining operation position along the rotation operation route. As the elastic biasing body is gradually compressed as the operation force increases, it is easy to sensibly recognize the removal operation position corresponding to the receiving means due to the increase in the operation resistance, and when the movement operation position is reached. Since the locking portion is pushed into the receiving position of the receiving means, the fitting and connecting work of both the pipe portions can be performed more efficiently and easily.

Configuring the pipe connection structure, the biasing means, the distal end surface of the locking portion, the tube axis distal end surface of the engaging portion inserted through the desorption recess with respect to the guide wall portion of the receiving pipe section An elastic biasing body that is elastically compressed when pressed from the direction may be provided .

According to the above configuration, the engaging portion of the insertion tube portion inserted into the attachment / detachment operation position of the rotation operation path through the attachment / detachment recess of the reception tube portion is provided with the elastic biasing body provided on the distal end surface thereof. When it is applied to the guide wall part of the receiving pipe part until it is compressed and rotated to the retaining operation position along the rotation operation path in that state, the locking part is reached when the retaining operation position is reached. Is pushed into the receiving position of the receiving means, so that the fitting and connecting work of both pipe portions can be performed more efficiently and easily.

Configuring the pipe connection structure, wherein the receiver pipe portion may have mounting portion of the cover attached over the outer peripheral surface of the inserted pipe section in the state of covering the outer surface side of the desorption recess is formed .

According to the above configuration, foreign matter such as mud and water can be prevented from entering from the detachable recess of the receiving pipe part, and the disassembling work of both the fitting and connected pipe parts is obstructed by the foreign substance. Easily.
The characteristic structure of the pipe connection structure according to claim 1 of the present invention is that between the inner peripheral surface of the receiving pipe portion and the outer peripheral surface of the insertion pipe portion that is inserted and connected to the inner pipe from the tube axis direction. An elastic sealing material for sealing to be compressed is attached, and an outer peripheral surface of the insertion tube portion is formed with a locking portion protruding outward in the radial direction, and further, at the end of the receiving tube portion Is a detachable recess that allows the locking portion to be inserted and removed in the tube axis direction, and the locking portion inserted through the detachable recess is rotated around the tube axis when the tube is inserted into the locking portion. A pipe connection structure in which a retaining wall portion that contacts from the axial direction and prevents the withdrawal movement is formed,
When the locking part inserted into the receiving tube through the detachable recess is rotated to the locking operation position along the rotation operation path, the locking operation position is brought into contact with the side end surface of the locking part. A rotation restricting means is provided in the rotation operation path, and the locking portion held in the retaining operation position by the rotation restriction means is pulled out in the tube axis direction from the rotation operation path. The locking part can be received freely at the position where it enters the side, and the receiving position is provided with a receiving means that prevents or suppresses the rotation of the locking part toward the detachable recess. .
In the pipe connection structure according to claim 2 of the present invention, the inner peripheral surface of the receiving pipe part is brought into contact with the distal end face of the locking part inserted through the detachable recess from the pipe axis direction, and rotates. A guide wall portion for guiding the rotation operation along the operation path is formed, and the guide wall portion is formed in a state of partitioning the annular seal groove for mounting the elastic seal material and the rotation operation path. There is in point.
In the pipe connection structure according to claim 3 of the present invention, the rotation restricting means is a rotation restricting protrusion protruding from the guide wall portion toward the retaining wall portion.
The pipe connection structure according to claim 4 of the present invention is that the rotation restricting means is a rotation restricting set screw.
In the pipe connection structure according to claim 5 of the present invention, the receiving means holds the locking portion in a state in which the locking portion at the locking operation position of the rotation operation path can be relatively engaged from the tube axis direction. It is in the point comprised from the recessed part formed in the wall part.
In the pipe connection structure according to claim 6 of the present invention, the receiving means is locked in a state in which the retaining wall portion is relatively engageable from the tube axis direction at the retaining operation position of the rotation operation path. It is in the point comprised from the recessed part formed in the part.
In the pipe connection structure according to claim 7 of the present invention, the portion of the guide wall portion corresponding to the retaining operation position enters and moves inwardly in the tube axis direction than the rotation operation path of the locking portion. This is in the point of forming a recess check recess that allows the
The pipe connection structure according to claim 8 of the present invention is such that the urging means for moving and urging the locking portion to the receiving position of the receiving means is inserted into the distal end surface of the locking portion and the tube. From the attachment / detachment operation position of the rotation operation path to the portion corresponding to the retaining operation position in the guide wall portion of the receiving pipe portion that abuts from the axial direction and guides the rotation operation around the tube axis. An elastic biasing body that is elastically compressed by contact with a locking portion that is rotated to the retaining operation position is provided.
In the pipe connection structure according to claim 9 of the present invention, the urging means for moving and urging the locking portion to the receiving position of the receiving means is inserted into the distal end surface of the locking portion through the detachable recess. An elastic biasing body that is elastically compressed when the distal end surface of the locking portion is pressed against the guide wall portion of the receiving tube portion from the tube axis direction is provided.
In the pipe connection structure according to claim 10 of the present invention, a mounting portion of a cover that is attached to the outer peripheral surface of the insertion tube portion in a state of covering the outer surface side of the demounting recess is formed in the receiving tube portion. It is in the point.

[First Embodiment]
1 to 6 show a pipe connection structure in the middle of a fluid transportation path, in which a cast iron joint body A attached to a fluid pipe 1 such as a cast iron water pipe is attached to the fluid pipe 1 in the pipe circumferential direction. It is composed of two split joint bodies A1 and A2 that are detachably fixedly connected along (circumferential direction), and one of the split joint bodies A1 has a through hole 2 formed in the peripheral wall of the fluid pipe 1. On the other hand, a branch receiving pipe portion 3 communicating in a concentric state from the second pipe axis Y direction orthogonal to the first pipe axis X direction of the fluid pipe 1 is integrally formed to project outward. At the same time, in the branch receiving pipe section 3 of the split joint body A1, the insertion pipe section 5 of the gate valve B provided with the valve body 4 for opening and closing the branch flow path W can be bent in a three-dimensional direction. In addition, the insertion tube portion 8 formed on one end side of the flow dividing tube 7 is sealed in the receiving tube portion 6 of the gate valve B in a sealed state. It is fitted and connected.

  Each of the split joint bodies A1 and A2 has pipe flanges 11 on both ends in the pipe circumferential direction which are connected to each other in the pipe circumferential direction via bolts 9 and nuts 10 so as to be fixedly connected to each other. In the first tube axis X direction both ends of each split joint body A1, A2 and each of the two places spaced apart in the pipe circumferential direction, Bolts 12 for holding a gap between the inner peripheral surface of each split joint body A1, A2 and the outer peripheral surface of the fluid pipe 1 are screwed together, and further formed on each of the split joint bodies A1, A2. In the seal groove, in order to prevent leakage of fluid (tap water) from the through hole 2 to the outside, between the outer peripheral surface of the fluid pipe 1 and the split joint bodies A1 and A2 adjacent in the pipe circumferential direction. A first elastic sealing material 13 made of synthetic rubber for sealing each of the connecting flange portions 11 is fitted. It is held.

  Between the inner peripheral surface of the split joint bodies A1 and A2 and the outer peripheral surface of the fluid pipe 1, there is an annular space S sealed (watertight) by the first elastic seal member 13 in a state of communicating with the through hole 2. Therefore, when the fluid in the fluid pipe 1 flows into the annular space S through the through-hole 2, an equal pressure is applied to the inner surfaces of the two split joint bodies A1 and A2, so that each first elastic sealing material The contact pressure of 13 can be maintained almost evenly.

Next, a pipe connection structure between the branch receiving pipe portion 3 of the split joint body A1 and the insertion pipe portion 5 of the gate valve B will be described.
As shown in FIG. 1, one end portion 5A of the insertion tube portion 5 of the gate valve B in the second tube axis Y direction is formed to bulge in a partial spherical shape outward in the diameter direction, and the spherical portion 5A. On the outer peripheral surface, a partial spherical second slidable contact surface 5a is formed which is slidably in contact with the partial spherical first slidable contact surface 3a formed on the inner peripheral surface of the branch receiving pipe portion 3 of the split joint body A1. And the spherical portion 5A of the insertion tube portion 5 in which the inner diameter of the branch receiving pipe portion 3 of the split joint body A1 is concentric with the second tube axis Y of the branch receiving tube portion 3 It is comprised in the internal diameter which accept | permits insertion / extraction from the 2nd pipe axis Y direction.

  Further, of the inner peripheral surface of the branch receiving pipe portion 3 of the split joint body A1, the portion on the opening side that is continuous with the first sliding contact surface 3a that is in sliding contact with the second sliding contact surface 5a of the insertion tube portion 5 An annular seal groove 3b that fits and holds an annular synthetic rubber second elastic seal material 14 that seals (watertight) between the joint surfaces of the branch receiving pipe section 3 and the insertion pipe section 5 that face each other. And an annular groove 3c that fits and holds the C-shaped retaining member 15 is formed between the second elastic seal member 14 and the retaining member 15. A slidable contact guide member 16 made of cast iron having a partially spherical third slidable contact surface 16a that is in slidable contact with the second slidable contact surface 5a is disposed.

  And with the said sliding contact guide member 16 and the retaining member 15, along the sliding contact surface 3a, 5a, 16a of the insertion pipe part 5 of the gate valve B with respect to the branch receiving pipe part 3 of the split joint body A1. An extraction preventing means for preventing the movement of the insertion tube portion 5 from the branch receiving tube portion 3 while preventing the bending due to rotation of the insertion tube portion 5 is configured.

  Further, between the branch receiving pipe portion 3 of the split joint body A1 and the inlet pipe portion 5 of the gate valve B, the insertion pipe portion 5 is temporarily fixed to the branch receiving pipe portion 3. Temporary fixing means 17 is provided so as to be freely fixed.

The temporary fixing fixing means 17 integrally forms connecting pieces 3A at a plurality of locations in the circumferential direction of the outer peripheral surface of the branch receiving pipe section 3 and includes the inlet pipe section 5 among the constituent members of the gate valve B. The valve case 18 formed integrally with the receiving pipe portion 6 has a connecting piece 18A opposite to each connecting piece 3A on the branch receiving pipe portion 3 side in the second tube axis Y direction. , And a temporary fixing bolt 17A is inserted across the connecting pieces 3A, 18A facing each other in the second tube axis Y direction, so that the tip of the screw portion of the temporary fixing bolt 17A is inserted. By tightening the nut 17B screwed to the side, the branch receiving pipe part 3 and the insertion pipe part 5 are temporarily fixed and fixed at a bending neutral position where their pipe axes coincide or substantially coincide with each other. It is configured.
Then, after the pipe connection work of the branch piping system is completed, the temporary fixing by the temporary fixing bolt 17A and the nut 17B is released.

Next, a pipe connection structure between the inlet pipe part 6 of the gate valve B and the inlet pipe part 8 of the branch pipe 7 will be described.
As shown in FIGS. 2 to 6, the annular seal groove 6 a formed on the inner peripheral surface of the receiving tube portion 6 is inserted and connected to the receiving tube portion 6 from the second tube axis Y direction. A third elastic sealing material 20 for sealing that is compressed between the outer peripheral surface of the insertion tube portion 8 and a plurality of circumferential positions on the outer peripheral surface of the insertion tube portion 8 (in this embodiment, (4 locations) are formed with plate-like locking portions 21 projecting radially outward in a posture along the circumferential direction, and further at a plurality of circumferential locations at the end of the receiving tube portion 6 (in this embodiment). 4 places), the demounting recesses 22 permitting the insertion / removal movement of the respective locking portions 21 in the second tube axis Y direction, and the respective locking portions 21 inserted through the respective demounting recesses 22 are provided in the second tube. A retaining wall portion 23 that comes into contact with each locking portion 21 from the direction of the second tube axis Y when it is rotated around the axis Y, and prevents the removal movement, and each detachment A guide wall portion 24 that abuts the distal end surface 21a of each locking portion 21 inserted through the portion 22 from the second tube axis Y direction and guides the rotation operation around the second tube axis Y is formed. Has been.

  The inner surface 23 a of each retaining wall portion 23 is pulled out in the second tube axis Y direction from the rotation operation path 25 for the locking portion 21 formed between the opposing surfaces of the retaining wall portion 23 and the guide wall portion 24. The locking part 21 can be received freely at the side (outside side), that is, at the position where it enters the outer surface 23b side of each retaining wall part 23, and at the receiving position, the detachable recess 22 of the locking part 21 In the example of the receiving means D for preventing the relative rotation to the side, the locking portion 21 at the retaining operation position of the rotation operation path 25 can be engaged (engaged) from the second tube axis Y direction. A free receiving recess 26 is formed and the locking portion 21 is moved and urged to the receiving position of the receiving means D. In other words, each locking portion is engaged with each receiving recess 26. An urging means C for urging and moving 21 to the receiving position side is provided.

  The urging means C is rotated by using the elastic restoring force of the third elastic seal member 20 compressed between the inner peripheral surface of the receiving tube portion 6 and the outer peripheral surface of the insertion tube portion 8. The engaging portion 21 of the insertion tube portion 8 that has been rotated to the retaining operation position of the path 25 is configured to move and urge toward the receiving position side of the receiving recess 26.

  When the inlet pipe portion 6 of the gate valve B and the inlet pipe portion 8 of the diversion pipe 7 are fitted and connected in a sealed state, as shown in FIGS. The pipe portions 6 and 8 are moved relatively close to each other from the second tube axis Y direction in a state where the phases of the concave portion 22 and the locking portions 21 of the insertion tube portion 8 are matched, When the locking portion 21 is inserted into the receiving tube portion 6, the locking portions of the insertion tube portion 8 are operated by relatively rotating the tube portions 6 and 8 around the second tube axis Y. 21 and the retaining wall part 23 of the receiving pipe part 6 will be in the retaining state which can contact | abut from the 2nd pipe axis Y direction.

  At this time, since the elastic restoring force of the third elastic sealing material 20 that also serves as the urging means C acts on the insertion tube portion 8 of the flow dividing tube 7 in the detachment direction, Each locking portion 21 is engaged (engaged) with respect to the receiving recess 26 formed on the inner surface 23a from the second tube axis Y direction, and the locking portion 21 is rotated toward the detachable recess 22 side. It is blocked.

  Therefore, in a state in which each locking portion 21 of the insertion tube portion 8 enters each receiving recess 26 at the retaining operation position of the rotation operation path 25, each locking portion 21 is a third elastic sealing material. As long as the external force in the direction of detaching from the receiving recess 26 against the elastic restoring force of 20 does not act on both the pipe portions 6, 8, each locking portion 21 at the retaining operation position of the rotation operation path 25 is removed. It cannot be rotated to the detaching operation position facing the concave portion 22 for use.

  In addition, the rubber-made cylindrical shape attached to the edge part of the outer peripheral surface of the said receiving pipe part 6 over the outer peripheral surface of the insertion pipe part 8 in the state which covers the outer surface side of the removal recessed part 22 A hook-shaped mounting portion 29 for the cover 28 is formed.

[Second Embodiment]
In FIG. 7, the insertion tube portion 31 formed at the end portion of the other fluid tube 1 is fitted and connected in a sealed state to the receiving tube portion 30 formed at the end portion of the one fluid tube 1. An insertion tube portion 31 showing a tube connection structure and inserted and connected to the receiving tube portion 30 from the tube axis X direction in an annular seal groove 30a formed on the inner peripheral surface of the receiving tube portion 30. A third elastic sealing material 20 for sealing that is compressed between the outer peripheral surface of the insertion tube portion 31 and a plurality of circumferential positions on the outer peripheral surface of the insertion tube portion 31 (four locations in the embodiment) A plate-like locking portion 21 that protrudes radially outward in a posture along the circumferential direction is formed, and further, at a plurality of circumferential locations (four locations in the embodiment) of the end portion of the receiving tube portion 30, Detachable recesses 22 permitting the insertion / removal movement of each locking portion 21 in the tube axis X direction, and the locking portions 21 inserted through the mounting / demounting recesses 22 are pipes. Retaining wall portions 23 that come into contact with the respective engaging portions 21 from the direction of the tube axis X when they are rotated around the core X, and prevent the movement of coming out, and the respective engaging portions inserted through the demounting recesses 22. A guide wall portion 24 is formed in contact with the distal end surface 21a of the portion 21 from the tube axis X direction and guides a rotation operation around the tube axis X.

The inner surface 23a of each retaining wall 23 is the same as in the first embodiment shown in FIGS. 2 to 6 (30 and 31 are added in parentheses in FIGS. 2 to 6 to share the drawings), The outer side in the tube axis X direction from the rotation operation path 25 for the locking portion 21 formed between the opposing surfaces of this and the guide wall portion 24, that is, the outer surface 23b side of each retaining wall portion 23. Receiving portion constituting the receiving means D for receiving the locking portion 21 at the position where it enters, and for preventing the locking portion 21 from rotating toward the detachable recess 22 at the receiving position. The recesses 26 are formed as depressions, and urging means C are provided for urging and moving the engaging portions 21 toward the receiving positions with respect to the receiving recesses 26.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
FIG. 8 shows an improvement of the pipe connection structure described in the first embodiment or the second embodiment, and the rotation operation path 25 passes through the guide wall portion 24 through the demounting recess 22 of the receiving pipe portions 6 and 30. When the locking portion 21 of the insertion tube portions 8 and 31 inserted in the detaching operation position is rotated along the rotation operation path 25 to the retaining operation position, it contacts the side end surface of the locking portion 21. Is provided with a rotation restricting projection 32 that constitutes a rotation restricting means E for holding at the retaining operation position.

In the case of this embodiment, the engaging portions 21 of the insertion tube portions 8 and 31 do not pass through the retaining operation position, and each engagement with respect to the receiving recess 26 formed on the inner surface 23a of each retaining wall portion 23. Engagement (engagement) of the stopper 21 from the second tube axis Y direction can be performed reliably and smoothly.
Other configurations are the same as those described in the first embodiment or the second embodiment, and therefore, the same reference numerals as those in the first embodiment or the second embodiment are attached to the same components. The description thereof is omitted.

[Fourth Embodiment]
FIG. 9 shows an improvement of the pipe connection structure described in each of the above-described embodiments, in which the receiving means D formed on the retaining wall part 23 among the guide wall parts 24 of the receiving pipe parts 6 and 30 is received. By attaching and moving the locking portion 21 inwardly in the tube axis X and Y directions with respect to the rotation operation path 25 of the locking portion 21, the attachment and detachment of the locking portion 21 is performed. A recess check concave portion 27 is formed which constitutes the shift check means F that prevents the rotation to the concave portion 22.

  When the locking portion 21 of the insertion tube portions 8 and 31 enters the receiving recess 26 at the retaining operation position of the rotation operation path 25, the locking portion 21 resists the biasing means C. When an external force in the direction of detachment from the receiving recess 26 is applied to both the tube portions 6 and 8 or both the tube portions 30 and 31, the locking portions 21 extracted from the receiving recesses 26 by the external force at that time are used as guide walls. It enters and moves to the respective recess check recesses 27 of the portion 24, and the relative rotation of each locking portion 21 toward the demounting recess 22 side is prevented.

Therefore, even when an external force is applied in a direction in which the locking portion 21 is detached from the receiving recess 26, the locking portion 21 is instantaneously moved by the rotation operation path 25 between the receiving recess 26 and the disengagement checking recess 27. Therefore, the probability of stopping and rotating is extremely small, and the function of preventing the disengagement of both the pipe parts 6 and 8 or the both pipe parts 30 and 31 that are fitted and connected can be enhanced.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment or 2nd Embodiment, the same number is attached to the same component location as 1st Embodiment, and the description is abbreviate | omitted. To do.

[Fifth Embodiment]
10 (a) and 10 (b) show an improvement of the pipe connection structure described in each of the above-described embodiments, and the urging means C of the engaging portion 21 inserted through the detachable recess 22 is shown. Of the guide wall portions 24 of the receiving tube portions 6 and 30 that contact the distal end surface 21a from the tube axis direction and guide the rotation operation around the tube axis, the receiving wall portion 23 is formed on the retaining wall portion 23. A composition that is elastically compressed by abutment with a locking portion 21 that is rotated from a detaching operation position of the rotating operation path 25 to a retaining operation position at a portion opposite to the receiving recess 26 of the stopping means D. An elastic urging body 33 such as rubber is provided, and between the elastic restoring force of the elastic urging body 33 and the inner peripheral surface of the receiving tube portions 6 and 30 and the outer peripheral surface of the insertion tube portions 8 and 31. Due to the elastic restoring force of the third elastic sealing material 20 to be compressed, the third elastic seal member 20 is rotated to the retaining operation position of the rotation operation path 25. And it is configured to move biased position side receiving recess 26 receiving the engaging portion 21 of the mouth pipe portion 8, 31.

  Even when the locking portion 21 is pushed into the receiving recess 26, the elastic biasing body 33 is configured to contact the distal end surface 21a of the locking portion 21 in a compressed state.

  Therefore, the locking portion 21 of the insertion tube portions 8 and 31 inserted into the attachment / detachment operation position of the rotation operation path 25 through the attachment / detachment recess 22 of the receiving tube portions 6 and 30 is pulled out along the rotation operation path 25. As the elastic biasing body 33 is gradually compressed as it is rotated to the stop operation position, it is easy to sensuously recognize the stop operation position corresponding to the receiving recess 26 by increasing the operation resistance, Since the locking portion 21 is pushed into the receiving recess 26 when the retaining operation position is reached, the fitting and connecting work of both the tube portions 6, 8 or both the tube portions 30, 31 can be performed more efficiently and easily. Can do.

In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment or 2nd Embodiment, the same number is attached to the same component location as 1st Embodiment, and the description is abbreviate | omitted. To do.
Further, in the fifth embodiment, the urging means C includes the elastic urging body 33 provided on the guide wall portion 24 of the receiving pipe portions 6 and 30, and the inner peripheral surface of the receiving pipe portions 6 and 30. Although comprised from the 3rd elastic sealing material 20 compressed between the outer peripheral surfaces of the insertion tube parts 8 and 31, you may comprise only the elastic biasing body 33. FIG.

[Sixth Embodiment]
FIG. 11 shows the improvement of the pipe connection structure described in each of the above-described embodiments, and the latch inserted into the distal end surface 21a of the latch portion 21 through the detachable recess 22 to constitute the biasing means C. An elastic biasing body 34 such as a synthetic rubber that is elastically compressed when the distal end surface 21a of the portion 21 is pressed against the guide wall portion 24 of the receiving tube portions 6 and 30 from the tube axis direction is provided. The elastic restoring force of the elastic urging body 34 and the elasticity of the third elastic sealing material 20 compressed between the inner peripheral surface of the receiving tube portions 6 and 30 and the outer peripheral surface of the insertion tube portions 8 and 31. By the restoring force, the engaging portion 21 of the insertion tube portions 8 and 31 rotated to the retaining operation position of the rotating operation path 25 is configured to move and urge toward the receiving position side of the receiving recess 26. Has been.

  Even in a state where the locking portion 21 is pushed into the receiving recess 26, the elastic portion provided on the distal end surface 21 a of the locking portion 21 with respect to the guide wall portion 24 of the receiving pipe portions 6, 30 is provided. The force member 34 is configured to contact in a compressed state.

  Therefore, a locking portion 21 of the insertion tube portions 8 and 31 inserted into the attachment / detachment operation position of the rotation operation path 25 through the attachment / detachment recess 22 of the reception tube portions 6 and 30 is provided on the distal end surface 21a thereof. When the elastic urging body 34 is applied to the guide wall 24 of the receiving pipe sections 6 and 30 until it is compressed, and is rotated along the rotation operation path 25 to the removal operation position in that state, the removal is performed. When the locking operation position is reached, the locking portion 21 is pushed into the receiving recess 26, so that the fitting and connecting work of both the tube portions 6, 8 or both the tube portions 30, 31 can be performed more efficiently and easily. it can.

Other configurations are the same as those described in the first embodiment or the second embodiment, and therefore, the same reference numerals as those in the first embodiment or the second embodiment are attached to the same components. The description thereof is omitted.
In the sixth embodiment, the urging means C includes the elastic urging body 34 provided on the distal end surface 21a of the locking portion 21, the inner peripheral surfaces of the receiving tube portions 6 and 30, and the insertion tube portion. Although comprised from the 3rd elastic sealing material 20 compressed between the outer peripheral surfaces of 8,31, you may comprise only with the elastic biasing body 34. FIG.

[Seventh Embodiment]
FIGS. 12-14 shows another embodiment of the pipe connection structure demonstrated in each above-mentioned embodiment, and the circumferential direction several places (four places in the said embodiment) of the outer peripheral surface of the insertion tube parts 8 and 31 are shown. A cylindrical locking portion 21 projecting radially outward is formed, and a plurality of circumferential positions (four locations in the embodiment) of the end portions of the receiving tube portions 6 and 30 are connected to each engagement portion. A demounting recess 22 that allows the stopper 21 to be inserted and removed in the tube axis X and Y directions, and each locking portion 21 inserted through each demounting recess 22 are rotated around the tube axes X and Y. The retaining wall portions 23 that come into contact with the respective locking portions 21 from the tube axis X and Y directions to prevent the removal movement, and the distal end surfaces 21a of the respective locking portions 21 inserted through the respective demounting recesses 22. And a guide wall portion 24 that abuts from the second tube axis Y direction and guides the rotation operation around the second tube axis Y. Has been.

  Further, the inner surface 23a of each retaining wall portion 23 is in the tube axis X and Y directions more than the rotation operation path 25 for the locking portion 21 formed between the opposing surfaces of the retaining wall portion 23 and the guide wall portion 24. The locking portion 21 can be received freely at the position where it has come out (outside), that is, the position where it enters the outer surface 23b side of each retaining wall portion 23, and the locking portion 21 is removed at the receiving position. An example of a receiving means D for preventing or suppressing the relative rotation to the concave portion 22 side, and the locking portion 21 at the retaining position of the rotational operation path 25 is engaged from the tube axis X and Y directions. A receiving recess 26 having a substantially arcuate cross section having a free (engageable) cross section is formed, and an urging means for urging and moving each locking portion 21 toward the receiving position with respect to each receiving recess 26. C is provided.

  Furthermore, the insertion tube inserted into the attachment / detachment operation position of the rotation operation path 25 through the attachment / detachment recess 22 of the reception tube parts 6, 30 at the part facing the rotation operation path 25 of the reception tube parts 6, 30. When the locking portion 21 of the portions 8 and 31 is rotated to the retaining operation position along the rotation operation path 25, the rotation for holding the retaining portion 21 at the retaining operation position by contact with the side end surface of the locking portion 21. A rotation restricting set screw 35 constituting the movement restricting means E is screwed and fixed.

The receiving recess 26 having a substantially arc cross section is formed by drilling 36 with a drill or the like from the outside in the radial direction of the portion of the receiving pipe portions 6 and 30 that faces the rotation operation path 25.
Since other configurations are the same as the configurations described in the above-described embodiments, the same components are denoted by the same reference numerals as those of the embodiments, and the description thereof is omitted.

[Eighth Embodiment]
15 to 17 show another embodiment of the pipe connection structure described in each of the above-described embodiments, and there are a plurality of circumferential positions (four places in the present embodiment) on the outer peripheral surface of the insertion tube portions 8 and 31. In addition, a plate-like locking portion 21 that protrudes radially outward in a posture along the circumferential direction is formed, and a plurality of circumferential positions at the ends of the receiving pipe portions 6 and 30 (four locations in the embodiment) ) Includes a detachable recess 22 that allows insertion / removal movement of each locking portion 21 in the tube axis X, Y direction, and each locking portion 21 inserted through each detaching recess 22 is connected to the tube axis X, Retaining wall portions 23 that come into contact with the respective engaging portions 21 from the tube axis X and Y directions to prevent the removal movement when rotated around Y, and the respective engaging portions inserted through the respective demounting recessed portions 22 Guide that abuts the distal end surface 21a of the portion 21 from the second tube axis Y direction and guides the rotation operation around the second tube axis Y A wall portion 24 is formed.

  In addition, a rotation operation for the locking portion 21 formed between the opposing surfaces of the locking wall portion 23 and the guide wall portion 24 is provided at a portion of each locking portion 21 opposite to the locking wall portion 23. The locking portion 21 can be relatively received at the exit side (outside side) in the tube axis X and Y directions from the path 25, that is, at the position where it enters the outer surface 23 b side of each retaining wall portion 23. And in the receiving position, it is an example of the receiving means D for preventing the relative rotation to the detachable recessed part 22 side of the latching | locking part 21, It is a retaining wall part in the retaining operation position of the rotation operation path 25. The receiving recesses 37 in the form of square grooves that can be relatively engaged (engaged) from the tube axis X and Y directions are formed as depressions, and each locking portion 21 is provided with respect to each receiving recess 37. A biasing means C is provided for biasing the movement toward the receiving position.

  Since other configurations are the same as the configurations described in the above-described embodiments, the same components are denoted by the same reference numerals as those of the embodiments, and the description thereof is omitted.

[Other Embodiments]
(1) In each of the above-described embodiments, the urging means C is composed of any one of the third elastic sealing material 20, the elastic urging bodies 33 and 34, or a combination thereof. Any means such as water pressure may be used as long as it can move and urge the locking portion 21 toward the receiving position with respect to the receiving recess 26.
(2) In each of the embodiments described above, the pipe connection structure between the inlet pipe portion 6 of the gate valve B and the inlet pipe portion 8 formed on one end side of the branch pipe 7 or the end of one fluid pipe 1 Although the technique of the present invention is applied to the pipe connection structure between the receiving pipe part 30 formed in the part and the insertion pipe part 31 formed at the end of the other fluid pipe 1, for example, in the first embodiment The technique of the present invention may be applied to a pipe connection structure between the branch receiving pipe portion 3 of the joint body A1 and the insertion pipe portion 5 of the gate valve B.

1 is a partially cutaway side view of a pipe connection structure showing a first embodiment of the present invention. Cross-sectional side view of the receiving tube and insertion tube before connection Cross-sectional front view when the receiving tube and the insertion tube are connected from the tube axis direction Expanded cross-sectional view of the main part when the receiving tube part and the insertion tube part are connected from the tube axis direction Cross-sectional front view when the receiving tube and the insertion tube are rotated to the retaining position. Expanded cross-sectional view of the main part when the receiving tube and insertion tube are rotated to the retaining position Partially cutaway side view before connection of the pipe connection structure showing the second embodiment of the present invention The pipe | tube connection structure of 3rd Embodiment of this invention is shown, The expanded sectional view of the principal part when a receiving pipe part and an insertion pipe part are connected from a pipe axial direction. The pipe | tube connection structure of 4th Embodiment of this invention is shown, The expanded sectional view of the principal part when a receptacle pipe part and an insertion pipe part are operated by the retaining operation position The pipe connection structure of 5th Embodiment of this invention is shown, (A) is an expanded sectional view of the principal part when a receiving pipe part and an insertion pipe part are connected from a pipe-axis direction, (B) is a receiving port. Expanded cross-sectional view of the main part when the tube part and the insertion tube part are rotated to the retaining operation position The pipe | tube connection structure of 6th Embodiment of this invention is shown, The expanded sectional view of the principal part when a receiving pipe part and an insertion pipe part are connected from a pipe axial direction. Partially cutaway side view before connection of pipe connection structure showing a seventh embodiment of the present invention Front view of end face of receiving tube Expanded cross-sectional view of the main part when the receiving tube and insertion tube are rotated to the retaining position Partially cutaway side view before connection of pipe connection structure showing a seventh embodiment of the present invention Cross-sectional front view when the receiving tube and the insertion tube are connected from the tube axis direction (A) is a developed cross-sectional view of the main part when the receiving tube part and the insertion tube part are connected from the tube axis direction, and (b) is the rotation of the receiving tube part and the insertion tube part to the retaining position. Expanded cross-sectional view of the main part when moved

Explanation of symbols

C Energizing means D Receiving means F Disengagement checking means X Tube axis (first tube axis)
Y tube axis (second tube axis)
6 Receptacle tube portion 8 Insertion tube portion 20 Elastic seal material (third elastic seal material)
21 Locking portion 21a Tip surface 22 Detachable recess 23 Retaining wall portion 23a Inner surface 23b Outer surface 24 Guide wall portion 25 Rotating operation portion 26 Receiving recess 27 Recessing recess 30 Receiving tube portion 31 Inserting tube portion 32 times Movement restricting projection 33 Elastic urging body 34 Elastic urging body 37 Receiving recess

Claims (10)

An elastic sealing material for sealing that is compressed between the outer peripheral surface of the insertion tube portion that is inserted and connected to the inner peripheral surface of the receiving tube portion from the tube axis direction is attached to the inner peripheral surface, A locking portion that protrudes radially outward is formed on the outer peripheral surface of the insertion tube portion, and the end of the receiving tube portion is allowed to be inserted and removed in the tube axis direction. And a retaining wall portion that comes into contact with the latching portion from the direction of the tube axis and prevents movement when the latching portion inserted through the demounting recess is rotated around the tube axis. A pipe connection structure in which
When the locking part inserted into the receiving tube through the detachable recess is rotated to the locking operation position along the rotation operation path, the locking operation position is brought into contact with the side end surface of the locking part. A rotation restricting means is provided in the rotation operation path, and the locking portion held in the retaining operation position by the rotation restriction means is pulled out in the tube axis direction from the rotation operation path. A pipe connection structure in which a locking part can be received at a position where it enters the side, and a receiving means is provided at the receiving position to prevent or suppress the rotation of the locking part toward the detachable recess. . A guide wall that guides the rotation operation along the rotation operation path by contacting the inner peripheral surface of the receiving tube portion with the distal end surface of the locking portion inserted through the detachable recess from the tube axis direction. 2. The pipe connection structure according to claim 1, wherein the guide wall portion is formed in a state of partitioning an annular seal groove on which the elastic sealing material is mounted and the rotation operation path. The pipe connection structure according to claim 2, wherein the rotation restricting means is a rotation restricting protrusion protruding from the guide wall portion toward the retaining wall portion. The pipe connection structure according to claim 1 or 2, wherein the rotation restricting means is a rotation restricting set screw. The said receiving means is comprised from the recessed part formed in the retaining wall part in the state in which the latching | locking part in the retaining operation position of a rotation operation path | route can be relatively engaged from a pipe-axis direction. Item 5. The pipe connection structure according to any one of Items 1 to 4 . The said receiving means is comprised from the recessed part formed in the latching | locking part in the state in which the retaining wall part can be relatively engaged from the tube-axis direction in the retaining operation position of a rotation operation path | route. 5. The pipe connection structure according to any one of 1 to 4 . The part of the guide wall corresponding to the retaining operation position is formed with a recess for preventing the displacement from entering the tube axis inward of the pivoting operation path of the locking part. Item 4. The pipe connection structure according to item 2 or 3 . The urging means for urging and moving the locking portion to the receiving position of the receiving means is in contact with the distal end surface of the locking portion inserted through the detachable recess from the tube axis direction and around the tube axis. A locking portion that is rotated from the detachment operation position of the rotation operation path to the removal operation position in a portion corresponding to the removal operation position in the guide wall portion of the receiving pipe portion that guides the rotation operation of The pipe connection structure according to any one of claims 1 to 7, wherein an elastic biasing body that is elastically compressed by the contact is provided. The urging means for moving and urging the locking portion to the receiving position of the receiving means is provided at the distal end surface of the locking portion, and the distal end surface of the locking portion inserted through the detachable recess is a guide for the receiving tube portion. The pipe connection structure according to any one of claims 1 to 7, wherein an elastic biasing body that is elastically compressed when pressed against the wall portion from the pipe axis direction is provided.   The mounting part of the cover attached over the outer peripheral surface of an insertion tube part in the state which covers the outer surface side of the removal | desorption recessed part is formed in the said receiving tube part. The pipe connection structure described in 1.

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