JP4542366B2 - Pipe connection structure - Google Patents

Description

  The present invention relates to a tube connection structure in which an insertion tube portion is inserted and connected to a receiving tube portion from the tube axis direction.

Various types of pipe connection structures have been proposed in the past as the pipe connection structure that has improved the function of preventing the separation between the receiving pipe part and the insertion pipe part. ), (B).
(A) An annular engagement portion that protrudes radially outward is formed on the outer peripheral surface of the insertion tube portion, and a circumferential groove formed on the reception side of the inner peripheral surface of the reception tube portion A substantially C-shaped locking member that is elastically deformable on the diameter-enlarged side to prevent the disengagement of both by contacting the engaging portion of the insertion tube portion from the tube axis direction; At the corners opposite to each other in the tube axis direction between the engaging portion of the tube portion and the lock member, the lock member is circulated to the inner diameter through which the insertion tube portion can be passed with the insertion tube portion. A pipe connection structure in which a cam surface is formed in the groove to be elastically deformed to the enlarged diameter side (see Patent Document 1).

(B) Engagement portions projecting radially outward are formed at a plurality of locations in the circumferential direction of the outer peripheral surface of the insertion tube portion, and the insertion tube portion is formed on the inner peripheral surface side of the reception tube portion. The retaining wall portion that prevents relative disengagement movement in the tube axis direction of both tube portions by abutting with the engaging portion of the tube in the tube axis direction, and only when both the tube portions are in a specific phase. A pipe connection structure in which a detachable recess is formed to allow insertion / removal of each engagement part from the tube axis direction with respect to the insertion connection position in the mouth pipe part (see Patent Document 2).

JP-A-9-303636 JP 2003-166682 A

  In the former tube connection structure, the inner diameter that allows the engaging portion to pass through the lock member that is pre-installed in the circumferential groove with the insertion operation simply by inserting the insertion tube portion into the receiving tube portion. The diameter can be expanded up to 2mm, making it easy to assemble while exerting a strong detachment prevention function due to the contact between the lock member on the receiving tube side and the engaging portion on the insertion tube side. Can be achieved. On the other hand, when it is necessary to disassemble both pipe parts due to maintenance inspection, parts replacement, etc., the inlet pipe part passes through the annular space between the inner peripheral surface of the inlet pipe part and the outer peripheral surface of the inlet pipe part. The lock member has to be subjected to diameter expansion operation against the elastic force until the side engaging portion can pass through, and much labor and labor are required for the disassembling work.

  Also, in the latter pipe connection structure, when it is necessary to disassemble both pipe parts due to maintenance inspection, parts replacement, etc., the insertion at the position facing the retaining wall part of the receiving pipe part in the pipe axis direction is opposite. Rotate both pipe parts relative to each other around the tube axis so that the engaging part of the mouth pipe part faces the detachable recess of the receiving pipe part, and then detach the insertion pipe part from the receiving pipe part The connection between both pipe parts can be released by pulling and moving to the side, but both heavy pipe parts rotate relative to each other around the pipe axis when both pipe parts are connected or disconnected. The relative rotation work required a lot of labor and labor.

  The present invention has been made in view of the above-described actual situation, and its main problem is to prevent strong detachment due to contact between the lock member on the receiving tube portion side and the engaging portion on the insertion tube portion side. An object of the present invention is to provide a pipe connection structure capable of efficiently and easily performing the assembling work and the disassembling work of both pipe parts with a small amount of labor while ensuring the function.

In the present invention , the engagement tube formed on the outer peripheral surface of the insertion tube portion is contacted with the inner peripheral surface of the receiving tube portion to which the insertion tube portion is inserted and connected from the tube axis direction from the tube axis direction. by contacting, locking member for preventing the disengagement movement of the two pipe portions is provided, et al is,
Unlocking that allows the engaging portion of the insertion tube portion to be inserted into and removed from the tube axis direction relative to the insertion connection position in the receiving tube portion by rotating the lock member around the tube axis with respect to the receiving tube portion. There may be provided a lock switching means for switching between the state and the locked state in which the disengagement movement in the tube axis direction of the engaging portion of the insertion tube portion at the insertion connection position is prevented .

According to the above configuration , when connecting both pipe parts, the lock member is rotated around the tube axis with respect to the receiving pipe part, the lock switching means is brought into the unlocked state, and the insertion connection in the receiving pipe part is made. After the engagement part of the insertion tube part is inserted and moved from the tube axis direction to the position, the lock switching means is locked by rotating the lock member around the tube axis with respect to the reception tube part. By switching to, the engagement portion of the insertion tube portion at the insertion connection position can be reliably prevented from coming off along the tube axis direction.

  Further, when disassembling both pipe parts, the lock member is rotated around the tube axis with respect to the receiving pipe part, and the lock switching means in the locked state is switched to the unlocked state. The engaging portion of the insertion tube portion at the insertion connection position in the tube portion can be relatively pulled out and moved as it is along the tube axis direction.

  Therefore, only the lock member is rotated with respect to the receiving tube portion, and both the tube portions themselves do not need to be relatively rotated around the tube axis, so that the locking member on the receiving tube portion side and the insertion tube portion Assembling work and disassembling work of both pipe parts can be efficiently and easily performed with little effort, while reliably exerting a strong detachment prevention function by contact with the side engaging part.

In the present invention , the lock switching means attaches the lock member to an annular holding groove formed on the inner peripheral surface of the receiving pipe portion so as to be freely rotatable, and is attached to the lock member in the tube axis direction of the locking portion. Detachable recess for allowing insertion / extraction movement (first removal recess, the same applies to the following) and the withdrawal movement of the engaging portion inserted at the insertion connection position through this removal recess is prevented by abutting from the tube axis direction. A retaining wall portion (a first retaining wall portion, the same applies hereinafter) may be formed.

According to the above configuration , when both pipe portions are connected, the lock member attached to the annular holding groove of the receiving pipe portion is rotated, and the engagement / disengagement portion of the lock member and the insertion pipe portion are engaged. And the receiving tube portion after the engaging portion of the insertion tube portion is inserted and moved from the tube axis direction to the insertion connection position in the receiving tube portion. The locking member is rotated with respect to the locking member, and the locking wall portion of the locking member and the engaging portion of the insertion tube portion are switched to the locked state facing each other in the tube axis direction, thereby being in the insertion connection position. The disengagement movement of the engaging portion of the insertion tube portion in the tube axis direction can be prevented from coming into contact.

  Also, when disassembling both pipe parts, the lock member that is locked with respect to the receiving pipe part is rotated around the tube axis to switch to the unlocked state. The engaging portion of the insertion tube portion at the connection position can be relatively pulled out and moved from the tube axis direction.

  Therefore, it is possible to efficiently and easily perform the assembling work and the disassembling work of both pipe parts with less labor while making sure that a powerful separation preventing function is exhibited, and even when configuring the lock switching means therefor. Since it is only necessary to mount a lock member having a detachable recess and a retaining wall portion to the annular holding groove of the receiving pipe portion so as to be freely rotatable, the pipe connection structure can be simplified and the manufacturing cost can be reduced. Can do.

In the present invention , the lock member is disposed on the tube axis side so that the shaft core of the lock member and the tube axis of the port tube portion are aligned between the annular holding groove of the port tube portion and the lock member. An elastic ring for moving and energizing may be interposed .

According to the above configuration , the elastic ring interposed between the annular holding groove of the receiving pipe portion and the locking member can match the axial center of the locking member with the tubular axial center of the receiving pipe portion. The contact state in the circumferential direction between the engagement portion of the insertion tube portion and the lock member on the side of the reception tube portion is close to the set state, and has a powerful detachment prevention function due to contact between the lock member and the engagement portion. It can be demonstrated reliably.

In the present invention , the lock member may be composed of a split lock body that is divided into a plurality of portions in the circumferential direction, and may be configured to be connectable in an annular shape or a C shape in the receiving pipe portion .

According to the above configuration , when the lock member is mounted in the receiving tube portion, the plurality of divided lock bodies constituting the lock member are inserted from the receiving tube of the receiving tube portion, and the inserted plurality of divided portions are inserted. Since the lock body is only connected in an annular shape or a C shape in the receiving pipe portion, for example, the lock member is urged to return to an outer diameter larger than the receiving diameter of the receiving pipe portion in an unloaded state, In addition, compared with the case where it is configured to be capable of reducing and deforming to an outer diameter that is smaller than the diameter of the receiving pipe portion against the return biasing force, the mounting work in the receiving pipe portion is reduced. It can be done easily with little effort.

In this invention , the said receiving pipe part is comprised from the receiving pipe main body and the receiving cover body which were parted along radial direction within the formation area of the annular holding groove formed in the internal peripheral surface thereof. In addition, the receiving cover body may be detachably attached to the receiving tube body in a state in which the lock member is rotatably mounted around the tube axis in the annular holding groove of the receiving tube portion .

According to the above configuration , when the lock member is mounted in the annular holding groove of the receiving pipe portion, the lock member is previously mounted in the annular holding groove formed in the receiving pipe main body or the receiving cover body, and then the receiving member is received. Since it is only necessary to attach the palate body to the receiving tube main body, for example, it can be efficiently mounted with less labor compared to the case where the lock member is mounted in the receiving tube portion with a reduced diameter.

In the present invention , the lock member may be formed with a knob that can be rotated from the outside of the receiving tube .

According to the above configuration , since the knob portion formed on the lock member can be gripped and rotated from the outside of the receiving tube portion, the lock switching means can be easily switched between the locked state and the unlocked state. be able to.

In the present invention, there is provided an operation engaging portion that can be engaged with the lock member from the tube axis direction from the outside of the receiving tube portion through a gap between the receiving-side inner peripheral surface and the outer peripheral surface of the insertion tube portion. A rotating operation jig may be detachably provided .
According to the above configuration , when the lock switching means is switched to the locked state or the unlocked state, the operation engaging portion of the rotation operation jig is configured to have the receiving side inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion. By engaging the lock member through the gap formed between the lock member and the lock member, the lock member can be freely rotated from the outside of the receiving pipe portion. There is no restriction on the configuration of the means.

In the present invention , the annular wall portion that protrudes radially inward in a state of preventing the lock member mounted in the receiving tube portion from coming out and moving at the receiving side end portion of the receiving tube portion. The annular wall portion is formed with a detachable second concave portion (detachable second concave portion, the same shall apply hereinafter) that allows the engaging projection of the insertion tube portion to be inserted and removed in the tube axis direction. And the locking member has a side of the second concave portion of the annular wall portion when the locking wall portion and the engaging portion of the insertion tube portion are switched to a locked state in which they face each other in the tube axis direction. A stopper portion that contacts the end edge may be provided .

According to the above configuration , when an external force in the pulling direction is applied to both pipe parts due to an earthquake, uneven settlement, etc., the engagement protrusions of the insertion pipe part are the second recesses of the annular wall part of the receiving pipe part. The lock member is in contact with the retaining wall portion of the lock member in a state of covering the tube from the tube axis direction, and further, the lock member is contacted with the annular wall portion of the receiving tube portion from the tube axis direction, and external force in the pulling direction is applied. The retaining wall portion of the lock member and the insertion port can be received and supported by the annular wall portion of the receiving tube portion, and the side edge of the second recess of the annular wall portion and the stopper portion provided on the locking member. Since it can hold | maintain in the locked state which the engaging part of a pipe part mutually opposes in a pipe-axis core direction, the separation prevention function of both pipe parts can be improved.

In the present invention , connection locking portions projecting radially outward are formed at a plurality of positions in the circumferential direction of the receiving cover body, and the connection structure of the receiving cover body is formed on the inner peripheral surface of the receiving pipe body. A stop groove engages in a rotatable manner around the axis of the tube, and is directed radially inward in a state in which the movement of the connection stopper of the receiving lid engaged in the connection groove is prevented from coming out. annular connecting wall portion protruding is formed Te, further, the annular connecting wall, the connecting recess to permit insertion and removal movement in pipe axis direction of the coupling engagement portion of the receptacle lid, through the coupling recess A connection wall portion is formed that contacts the connection locking portion from the tube axis direction and prevents the movement when the connection locking portion engaged in the connection groove is rotated to a predetermined connection position around the tube axis. May be.

According to the above configuration , when the lock member is mounted in the annular holding groove formed in the receiving tube body or the receiving cover body in advance and the receiving cover body is attached to the receiving tube body, the connection member of the receiving cover body is connected. After engaging the stopper with the connecting groove through the connecting recess formed in the annular connecting wall portion of the receiving body, the receiving cover body and the receiving tube body are received by the connecting wall portion of the annular connecting wall portion. By performing a relative rotation operation in a state in which the coupling locking portion of the palate body is opposed to the tube axis direction, the receiving lid body can be attached to the receiving pipe main body in a retaining state.

In the present invention , the receiving pipe main body and the receiving cover body of the receiving pipe part may be divided along the radial direction at a position passing through the inner end in the tube axis direction of the annular holding groove .

According to the above configuration , the lock member can be mounted in advance in the annular holding groove on the side of the receiving lid body that is easier to handle than the receiving pipe main body. The lock member can be easily attached as compared to the case where the palate body is divided along the radial direction at a position passing through the outer end in the tube axis direction of the annular holding groove.
The first characteristic configuration of the pipe connection structure according to the present invention is:
By abutting from the tube axis direction with the engaging portion formed on the outer peripheral surface of the insertion tube portion on the inner circumferential surface of the receiving tube portion where the insertion tube portion is inserted and connected from the tube axis direction, A locking member is provided to prevent the detachment movement of both pipe parts,
An unlocked state that allows the engaging portion of the insertion tube portion to be inserted into and removed from the tube axis direction with respect to the insertion connection position in the receiving tube portion by rotating the lock member around the tube axis with respect to the receiving tube portion. And a tube connection structure provided with a lock switching means for switching to a locked state in which the disengagement movement in the tube axis direction of the engaging portion of the insertion tube portion at the insertion connection position is prevented from contacting,
The lock switching means allows a lock member to be rotatably mounted in an annular holding groove formed on the inner peripheral surface of the receiving pipe portion, and allows the engagement member to be inserted and removed in the direction of the tube axis. Forming a first detachable recess and a first retaining wall that prevents the engagement portion inserted through the detachable first recess from being inserted into the insertion connection position from coming into contact with the tube from the axial direction. Configured,
An annular wall portion that protrudes inward in the radial direction is formed at the receiving end of the receiving tube portion in a state of preventing the lock member mounted in the receiving tube portion from moving out. In the annular wall portion, a detachable second recess allowing the engaging projection of the insertion tube portion to be inserted and removed in the tube axis direction, and an engaging portion inserted into the insertion connection position through the detachable second recess. And a second retaining wall portion that prevents the movement of the tube from coming off from the tube axis direction.
The inner diameter of the first retaining wall portion of the lock member is smaller than the inner diameter of the second retaining wall portion of the annular wall portion in the receiving tube portion and larger than the outer diameter of the outer peripheral surface of the insertion tube portion. And
An arc-shaped operation body that can be freely inserted and removed from the tube axis direction into the first recess of the lock member through an annular gap between the inner peripheral surface of the annular wall portion and the outer peripheral surface of the insertion tube portion in the receiving tube portion. And a rotation operation jig integrally formed at one end of the operation main body in the tube axis direction, and the operation main body of the fixed operation jig is attached to the first recess of the lock member. It is in the point which is comprised so that it can engage from the circumferential direction with respect to the internal-diameter side opening edge of this removal | desorption 1st recessed part in the inserted state.
The second characteristic configuration of the pipe connection structure according to the present invention is:
Between the annular holding groove of the receiving pipe portion and the lock member, the lock member is urged to move toward the pipe axis side so that the shaft core of the locking member and the pipe shaft core of the receiving pipe portion match. The point is that an elastic ring is interposed.
The third characteristic configuration of the pipe connection structure according to the present invention is:
The said lock member is comprised from the division | segmentation lock body divided | segmented into multiple in the circumferential direction, and exists in the point comprised so that it can connect in the annular | circular shape or C shape in a receiving pipe part.
The fourth characteristic configuration of the pipe connection structure according to the present invention is:
The lock member is formed with a knob that can be rotated from the outside of the receiving tube.
The fifth characteristic configuration of the pipe connection structure according to the present invention is:
When the lock member is switched to a locked state in which the first retaining wall portion and the engaging portion of the insertion tube portion are opposed to each other in the tube axis direction, the second recess portion of the annular wall portion is removed. The stopper portion is in contact with the side edge.
The sixth characteristic configuration of the pipe connection structure according to the present invention is:
The receiving pipe portion is constituted by a receiving pipe main body and a receiving cover body that are divided along a radial direction within a formation region of an annular holding groove formed on an inner peripheral surface of the receiving pipe portion. The receiving lid body is detachably attached to the receiving pipe body in a state where the lock member is rotatably mounted around the axis of the pipe in the groove.
The seventh characteristic configuration of the pipe connection structure according to the present invention is:
At a plurality of locations in the circumferential direction of the receiving cover body, there are formed connection locking portions protruding outward in the radial direction, and on the inner peripheral surface of the receiving pipe body, there are connection locking portions of the receiving cover body. A connecting groove that is rotatably engaged around the tube axis, and projects inward in the radial direction in a state in which the movement of the connection locking portion of the receiving lid engaged in the connecting groove is prevented from coming out. An annular connecting wall portion is formed. Further, in the annular connecting wall portion, a connecting recess for allowing insertion / removal movement in the tube axis direction of the connecting locking portion of the receiving cover body, and an inside of the connecting groove through the connecting recess. A connecting wall portion is formed which contacts the connecting locking portion from the direction of the tube axis to prevent the connecting movement when the connecting locking portion engaged with the shaft is rotated to a predetermined connection position around the tube axis. In the point.
The eighth characteristic configuration of the pipe connection structure according to the present invention is:
The receiving tube main body and the receiving cover body of the receiving tube portion are divided along the radial direction at a position passing through the inner end of the annular holding groove in the tube axis direction.

[First Embodiment]
FIGS. 1-16 shows the pipe connection structure provided in the piping system of the water pipe which is an example of a fluid pipe, and it is made from cast iron in the receiving pipe part 1 formed in the one end side of the water pipe P1 made from cast iron. The insertion tube portion 2 formed at one end of the water pipe P2 is inserted and connected from the direction of the tube axis X, and the annular mounting groove 3 formed on the inner peripheral surface 1a of the reception tube portion 1 has a reception port. An elastic sealing material 4 made of synthetic rubber for sealing between the inner peripheral surface 1a of the tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2 is mounted, and the inner peripheral surface of the receiving tube portion 1 1a is an example of an engaging portion that protrudes from the outer peripheral surface 2a of the insertion tube portion 2 in the vicinity of the seal mounting groove 3 that is displaced toward the receiving side. The maximum insertion position of both pipe portions 1 and 2 is brought into contact with one side surface of the engagement projection 5 integrally formed at a constant pitch from the tube axis X direction. An annular stopper wall portion 6 is integrally formed, and an insertion tube portion that is inserted and connected to a predetermined position in the reception tube portion 1 at the reception end portion of the inner peripheral surface 1 a of the reception tube portion 1. 2 protrudes radially inward in a state in which the locking movement 7 of the cast iron or steel, which is mounted in the receiving tube portion 1 so as to be relatively rotatable, can be prevented from coming off. An annular receiving wall 8 is integrally formed.

  As shown in FIGS. 2 to 4, each engaging projection 5 of the insertion tube portion 2 is provided between the stopper wall portion 6 and the annular reception wall portion 8 on the inner peripheral surface 1 a of the reception tube portion 1. Is formed in an annular mounting groove 9a formed in a portion continuous with the annular receiving wall portion 8 in the annular holding groove 9. Is attached with an elastic ring 10 that moves and urges the lock member 7 to the tube axis X side so that the axis of the lock member 7 and the tube axis X of the receiving pipe portion 1 coincide with each other.

  From the tube axis X direction of the engagement projection 5 of the insertion tube portion 2 with respect to the insertion connection position in the reception tube portion 1 by the rotation operation of the lock member 7 around the tube axis X with respect to the reception tube portion 1. Lock switching means A for switching between an unlocked state in which the insertion / removal movement is allowed and a locked state in which the disengagement movement of the engaging projection 5 of the insertion tube portion 2 at the insertion connection position in the tube axis X direction is prevented from coming into contact. Is provided.

As shown in FIG. 3, the lock switching means A moves the lock member 7 around the tube axis X against the elastic ring 10 mounted in the annular mounting groove 9 a in the annular holding groove 9 of the receiving tube portion 1. Is fitted in a sliding contact state that allows relative rotation operation at the same time, and is allowed to be inserted and removed in the tube axis X direction of each engaging projection 5 of the insertion tube portion 2 on the inner peripheral edge side of the lock member 7. Therefore, a detachable recess 7a (first detachable recess 7a, hereinafter the same) that opens toward the tube axis X direction and radially inward, and an insertion connection position in the annular holding groove 9 through the detachable recess 7a. The retaining wall portions 7b (first retaining wall portions 7b, the same applies hereinafter) that prevent the engagement protrusions 5 inserted into the shaft from coming out from the tube axis X direction are alternately formed in the circumferential direction. Has been.

  Therefore, the state in which each demounting recess 7a of the lock member 7 and each engagement protrusion 5 of the insertion tube portion 2 face each other in the tube axis X direction is the unlocked state of the lock switching means A, and the lock member 7 is a locked state of the lock switching means A when the retaining wall portions 7b of the inlet 7 and the engaging projections 5 of the insertion tube portion 2 face each other in the tube axis X direction.

  The outer diameter of the lock member 7 is larger than the inner diameter (receiving port diameter) of the annular receiving wall portion 8 of the receiving tube portion 1 and is substantially the same as the inner diameter of the elastic ring 10. The lock member 7 is composed of a divided lock body 7A that is divided into a plurality (in the embodiment, four divisions) in the circumferential direction at the circumferential center position of each detachable recess 7a.

  Each of the divided lock bodies 7A is mounted in a sliding state so as to be capable of relative rotation operation on the inner peripheral surface of the elastic ring 10 in the annular mounting groove 9a through the annular receiving wall portion 8 of the receiving tube portion 1. And is fixedly connected to both end portions in the circumferential direction of each divided lock body 7A with screws 20 in a state of being overlapped with the connecting piece 7c of the adjacent divided lock body 7A in the radial direction. In the state where the connecting pieces 7c are integrally formed and all the divided lock bodies 7A are fixedly connected in an annular shape within the elastic ring 10, the outer diameter thereof is the minimum inner diameter (the inner diameter of the annular receiving wall portion 8 of the receiving tube portion 1). More specifically, it is configured to be larger than the inner diameter of the second retaining wall portion 8B formed at a plurality of locations in the circumferential direction of the annular receiving wall portion 8, and the inner diameter thereof is further increased. The inner diameter of the second retaining wall portion 8B of the annular receiving wall portion 8 in the receiving tube portion 1 (receiving port diameter). A little smaller than, and is configured to slightly larger than the outer diameter of the outer circumferential surface 2a of the inserted pipe section 2.

  In the embodiment, the lock member 7 is configured by fixing and connecting all the divided lock bodies 7A in a ring shape in the receiving pipe portion 1. However, all the divided lock bodies 7A are connected in a C shape, You may comprise the lock member 7 which can be elastically deformed to radial direction.

  At four locations in the circumferential direction of the annular receiving wall portion 8 of the receiving tube portion 1, in order to allow the engaging projections 5 of the insertion tube portion 2 to be inserted and removed in the tube axis X direction, A detachable second recess 8A that opens inward in the X direction and in the radial direction is formed, and between the adjacent portions of the detachable second recess 8A, the lock member 7 is maintained in the lock operation position by an external force. Even if both pipe parts 1 and 2 rotate relative to each other, a situation occurs in which each detachable recess 7a of the lock member 7 and each engagement protrusion 5 of the insertion pipe part 2 face each other in the direction of the tube axis X. The second retaining wall portion that prevents the engagement protrusions 5 of the insertion tube portion 2 located in the annular holding groove 9 of the receiving tube portion 1 from moving apart along the tube axis X direction. 8B is formed.

  Further, as shown in FIGS. 7 to 16, a lock maintaining means B for fixing the lock member 7 in the locked state is provided between the annular receiving wall portion 8 of the receiving tube portion 1 and the lock member 7. The lock member 7 is received through an annular gap between the inner peripheral surface of the annular receiving wall portion 8 that is the inner peripheral surface of the receiving tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2. A rotation operation jig 11 that rotates from the outside of the mouth tube portion 1 is detachably provided.

  As shown in FIGS. 15 and 16, the lock maintaining means B is a closed body that can enter from the tube axis X direction into the detachable second recessed portion 8 </ b> A of the annular receiving wall portion 8 of the receiving tube portion 1. 12 is integrally formed with a locking projection 12a that can be engaged with the locking hole 7d formed in the retaining wall portion 7b of each split lock body 7A from the tube axis X direction. A pair of connecting pieces 12b that can be applied to the outer surfaces of both annular receiving wall portions 8 adjacent thereto are integrally formed on both sides in the direction, and each connecting piece 12b is formed on the outer surface of the second retaining wall portion 8B. A through-hole 12c through which the fixing bolt 13 to be screwed into the formed screw hole 8a is inserted is formed, and the locking projection 12a of the closing body 12 is inserted into each of the divided lock bodies 7A of the lock member 7 at the lock operation position. In a state of being engaged with the locking hole 7d, both the connecting pieces 12b of the closing body 12 are fixed to the fixing bolt. By preparative 13 via screwed fixed to the annular receptacle wall portion 8 receiver pipe portion 1, and is configured to secure maintain locking member 7 in the locked operating position.

  In addition, in the said embodiment, although it comprised so that the obstruction body 12 might be attached with respect to each detachable 2nd recessed part 8A currently formed in four places of the annular receptacle wall part 8 of the receptacle pipe part 1, at least one You may comprise so that the obstruction body 12 may be attached with respect to the removal | desorption 2nd recessed part 8A of a location.

  As shown in FIGS. 7, 13, and 14, the rotation operation jig 11 is provided between the inner peripheral surface of the annular receiving wall portion 8 of the receiving tube portion 1 and the outer peripheral surface 2 a of the insertion tube portion 2. Can be inserted into and removed from the tube core X direction into the detachable recess 7a of the lock member 7 through the annular gap formed on the inner periphery of the lock member 7, and the circumferential direction relative to the inner diameter side opening edge of the detachable recess 7a of the lock member 7 And an arc-shaped operation main body 11A that can be engaged with each other, and a substantially T-shaped operation gripping portion 11B integrally formed at one end of the operation main body 11A in the tube axis X direction.

  When the second recess 8A of the annular receiving wall 8 of the receiving tube 1 and the recess 7a of the lock member 7 are in the unlocked state facing each other with the tube axis X, the rotation operation is performed. The operation body 11A of the jig 11 is inserted from the direction X of the tube axis into the detachable recess 7a of the lock member 7 through one of the second detachable recesses 8A of the annular receiving wall 8 and in that state the insertion tube When the rotation operation is performed in the circumferential direction along the outer circumferential surface of the portion 2 by a set rotation angle (45 degrees in the present embodiment), the opening edge on the inner diameter side of the detachable recess 7a of the lock member 7 is the operation body 11A of the rotation operation jig 11 The lock is configured such that the detachable recess 7a of the lock member 7 and the second retaining wall portion 8B of the annular receiving wall portion 8 of the receiving tube portion 1 face each other at the tube axis X. Switch to state.

  Further, when the second recess 8A of the annular receiving wall portion 8 of the receiving tube portion 1 and the retaining wall portion 7b of the lock member 7 are in the locked state facing each other with the tube axis X, the rotational operation control is performed. The operation main body 11A of the tool 11 is passed through the annular gap formed between the inner peripheral surface of the annular receiving wall portion 8 of the receiving tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2 of the lock member 7. When inserting into the detachable recess 7a from the tube axis X direction and rotating in that state along the outer peripheral surface of the insertion tube portion 2 by a set rotation angle (45 degrees in the embodiment), the lock member 7 The opening edge of the inner diameter side of the detachable recess 7a is pressed by the operation body 11A of the rotation operation jig 11 and rotates integrally, and the detachable recess 7a of the lock member 7 and the annular receiving wall portion of the receiving tube portion 1 are rotated. 8 is switched to the locked state in which the detachable second recess 8A is opposed to the tube axis X.

  And when connecting the receiving tube part 1 and the insertion tube part 2, the lock member 7 with which the annular holding groove 9 of the receiving tube part 1 was mounted is rotated, and the removal recessed part of this lock member 7 is carried out. 7a and the engaging projection 5 of the insertion tube portion 2 are brought into the unlocked state in which they face each other in the direction of the tube axis X, and the insertion tube portion with respect to the insertion connection position in the annular holding groove 9 of the reception tube portion 1 After the engagement protrusion 5 of 2 is inserted and moved from the tube axis X direction, the lock member 7 is rotated with respect to the receiving tube portion 1 by a set rotation angle, and the retaining wall portion 7b of the lock member 7 is rotated. And the engagement projection 5 of the insertion tube portion 2 are switched to a locked state in which the engagement projection 5 of the insertion tube portion 2 is opposed to each other in the tube axis X direction. It is possible to reliably prevent the separation movement at the contact.

  Further, when disassembling both the pipe sections 1 and 2 connected, the lock member 7 that is locked with respect to the receiving pipe section 1 is rotated around the tube axis X by a set rotation angle, By switching to the unlocked state, the engagement projection 5 of the insertion tube portion 2 at the insertion connection position in the annular holding groove 9 of the reception tube portion 1 can be relatively pulled out and moved from the tube axis X direction. it can.

  Therefore, only the lock member 7 is rotated with respect to the receiving tube portion 1, and both the tube portions 1 and 2 themselves do not need to be relatively rotated around the tube axis X. The work of assembling and disassembling both pipe parts 1 and 2 is ensured while ensuring a strong detachment prevention function due to the contact between the locking member 7 of the tube and the engaging projection 5 on the insertion tube part 2 side. Can be done efficiently and easily. Moreover, even when configuring the lock switching means A for that purpose, the lock member 7 having the detachable recess 7a and the retaining wall portion 7b is simply mounted in the annular holding groove 9 of the receiving pipe portion 1 so as to be rotatable. Therefore, the pipe connection structure can be simplified and the manufacturing cost can be reduced.

  In addition, the outer peripheral surface of the receiving pipe part 1 and the insertion pipe part 2 in the state which covers the outer surface side of the annular receiving wall part 8 of the receiving pipe part 1 in the edge part of the outer peripheral surface of the said receiving pipe part 1 A flange-shaped mounting portion 16 is formed on the rubber cylindrical cover 14 attached in close contact with the outer peripheral surface 2a.

[Second Embodiment]
FIGS. 17 to 19 show an improvement of the lock member 7 described in the first embodiment. This is because the lock member 7 has a retaining wall portion 7b and an engagement protrusion 5 of the insertion tube portion 2. FIG. Is integrally formed with the stopper portion 15 that comes into contact with the side edge of the second recess 8 </ b> A of the annular receiving wall portion 8 of the receiving tube portion 1. In addition, the stopper portion 15 is also configured as a knob for rotating the lock member 7 from the outside of the receiving tube portion 1.

As shown in FIGS. 18 and 19, the lock maintaining means B for fixing the lock member 7 to the receiving tube portion 1 in the locked state is a second recessed portion of the annular receiving wall portion 8 of the receiving tube portion 1. A stopper recess 15d is formed in the closing body 12 that can enter the tube axis X direction with respect to 8A, and the stopper 15 can be engaged from the tube axis X direction. The pair is integrally formed with a pair of connecting pieces 12b that can be applied to the outer surfaces of the two annular receiving wall portions 8 adjacent thereto, and each connecting piece 12b is formed on the outer surface of the second retaining wall portion 8B. A through hole 12c through which the fixing bolt 13 screwed into the screw hole 8a is inserted is formed, and the stopper portion 15 of the lock member 7 at the lock operation position is engaged in the locking recess 12d of the closing body 12. In this state, the connecting pieces 12b of the closing body 12 are connected via the fixing bolts 13. By screwing fixed to the annular receptacle wall portion 8 receiver pipe portion 1 Te, and is configured to remain fixed locking member 7 in the locked operating position.
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]
20 to 22 show an improvement of the receiving pipe portion 1 described in each of the above-described embodiments. This is because the receiving pipe portion 1 is divided along the radial direction within the formation region of the annular holding groove 9. Specifically, it is composed of a receiving pipe body 1A and a receiving cover body 1B that are divided along the radial direction at a position passing through the inner end of the annular holding groove 9 in the tube axis X direction. The receiving lid 1B is detachably attached to the receiving pipe main body 1A in a state in which the lock member 7 is rotatably mounted around the tube axis X in the holding groove 9.

  At a plurality of locations in the circumferential direction of the receptacle lid 1B (four locations in the circumferential direction in the present embodiment), connection locking portions 17 projecting radially outward are integrally formed, and the receptacle tube body 1A On the inner peripheral surface, a connection groove 18 in which the connection locking portion 17 of the receiving cover body 1B is rotatably engaged around the tube axis X, and a connection structure of the receiving cover body 1B received in the connection groove 18 An annular connecting wall portion 19 projecting radially inward in a state of preventing the stop portion 17 from coming off is integrally formed. Further, the annular connecting wall portion 19 is connected to the receiving lid 1B. A connecting recess 19A that allows the portion 17 to move in and out in the direction of the tube axis X, and a connection locking portion 17 that is engaged in the connecting groove 18 through the connection recess 19A are arranged at a predetermined connection position around the tube axis X. When it is rotated, it comes into contact with the connection locking part 17 from the tube axis X direction and moves out. Connecting wall portion 19B is formed to prevent.

  Then, when the lock member 7 is mounted in advance in the annular holding groove 9 formed in the receiving cover body 1B and the receiving cover body 1B is attached to the receiving pipe main body 1A, the connection locking portion 17 of the receiving cover body 1B. Is inserted into the connecting groove 18 through the connecting recess 19A formed in the annular connecting wall portion 19 of the receiving body 1, and then the receiving lid body 1 </ b> B and the receiving pipe body 1 </ b> A are connected to the annular connecting wall portion 19. By relatively rotating the connecting wall portion 19B and the connecting locking portion 17 of the receiving cover body 1B so as to face each other in the tube axis X direction, the receiving cover body 1B is prevented from being removed from the receiving pipe body 1A. Can be installed in condition.

  Therefore, when the lock member 7 is mounted in the annular holding groove 9 of the receiving pipe portion 1, the lock member 7 and the elastic ring 10 are mounted in the annular holding groove 9 formed in the receiving cover body 1B in advance. Since it is only necessary to attach the receiving lid 1B to the receiving tube main body 1A, for example, the lock member 7 is efficiently deformed with less labor compared to the case where the lock member 7 is deformed in a reduced diameter and mounted in the receiving tube 1. Can be installed.

In the present embodiment, not only the split ring described in the first embodiment but also an annular ring that cannot be reduced in diameter and a C-shaped ring that can be reduced in diameter can be used as the lock member 7.
Moreover, you may use fixing means, such as a volt | bolt and a nut, which fixes the receptacle cover body 1B to the receptacle pipe main body 1A in a retaining state.
Furthermore, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same component location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) In each of the above-described embodiments, the annular mounting groove 9a is formed in a portion continuous with the annular receiving wall portion 8 in the annular holding groove 9, and the shaft core of the lock member 7 is formed in the annular mounting groove 9a. An elastic ring 10 is attached to move and urge the lock member 7 toward the tube axis X so that the tube axis X of the receiving tube portion 1 and the tube tube core 1 coincide with each other. It may be attached directly.

  (3) As an operation means for rotating the lock member 7 from the outside of the receiving pipe portion 1, a dedicated knob for rotating the lock member 7 from the outside of the receiving pipe portion 1 may be provided. .

  (4) In each of the above-described embodiments, the lock member 7 is constituted by a divided lock body divided into a plurality of parts in the circumferential direction, and these divided lock bodies are formed in an annular shape or a C shape in the receiving pipe portion 1. Although it was configured to be connectable, it is not limited to this configuration. For example, the lock member 7 is formed to have an outer diameter larger than the receiving diameter of the receiving pipe portion 1 in an unloaded state (natural state), In addition, it may be configured such that the diameter can be reduced and deformed to an outer diameter smaller than the diameter of the receiving tube portion 1 against the elastic restoring force thereof.

The perspective view of the water pipe system pipe connection structure which shows 1st Embodiment of this invention. Cross-sectional side view Exploded perspective view Exploded sectional side view Perspective view when inserting and connecting the insertion tube portion to the reception tube portion Cross-sectional front view of the unlocked state when the insertion tube is inserted and connected to the receiving tube Perspective view when inserting the rotation jig Cross-sectional front view in the locked state Notched perspective view of essential parts when unlocked Expanded sectional view of the main part before the engaging protrusion is engaged Notched perspective view of essential parts when locked Expanded cross-sectional view of the main part when in the locked state Cross-sectional side view when inserting a rotation operation jig Cross-sectional front view of the main part when rotating the inserted rotation operation jig Exploded sectional view of the main part before mounting the lock maintenance means Exploded sectional view of the main part when the lock maintenance means is attached The expanded sectional view of the principal part before the engagement protrusion which shows 2nd Embodiment of this invention engages Exploded sectional view of the main part before mounting the lock maintenance means Exploded sectional view of the main part when the lock maintenance means is attached A third embodiment of the present invention is shown, wherein (a) is a cross-sectional side view of the main part when the receiving cover body is attached to the receiving pipe body, and (b) is when the receiving cover body is attached to the receiving pipe body. Cross-sectional side view of essential parts (A) is a front view of the receiving cover body, (B) is a front view of the locking member, and (C) is a front view of the receiving pipe body. (A) is a front view when the receiving cover body is attached to the receiving pipe body, (B) is a front view of the unlocked state in which the receiving cover body is attached to the receiving pipe body, and (C) is a receiving view of the receiving cover body. Front view of the locked state attached to the mouth tube body

Explanation of symbols

A lock switching means X tube axis 1 receiving tube portion 1A receiving tube body 1B receiving cover body 1a inner peripheral surface 2 insertion tube portion 2a outer peripheral surface 5 engaging portion (engaging protrusion)
7 Lock member 7A Split lock body 7a Detachable first recess 7b First retaining wall 8 Annular wall (annular receiving wall)
8A Detachable second recess 8B Second retaining wall 9 Annular holding groove 10 Elastic ring 11 Rotating operation jig 11A Operation main body 11B Operation gripping body 15 Stopper part 17 Connection locking part 18 Connection groove 19 Annular connection wall part 19A Connection Recess 19B for connecting wall

Claims (8)

By abutting from the tube axis direction with the engaging portion formed on the outer peripheral surface of the insertion tube portion on the inner circumferential surface of the receiving tube portion where the insertion tube portion is inserted and connected from the tube axis direction, locking member for preventing the disengagement movement of the two pipe portions is provided, et al is,
By rotating operation of around pipe axis of the locking member with respect to receiving opening tube portion, unlocked state to permit the insertion and removal movement of the pipe axis direction of the engagement portion of the inserted pipe section for insertion and connection position of the receiving pipe section And a tube connection structure provided with a lock switching means for switching to a locked state in which the disengagement movement in the tube axis direction of the engaging portion of the insertion tube portion at the insertion connection position is prevented from contacting ,
The lock switching means allows a lock member to be rotatably mounted in an annular holding groove formed on the inner peripheral surface of the receiving pipe portion, and allows the engagement member to be inserted and removed in the direction of the tube axis. Forming a first detachable recess and a first retaining wall that prevents the engagement portion inserted through the detachable first recess from being inserted into the insertion connection position from coming into contact with the tube from the axial direction. Configured,
An annular wall portion that protrudes inward in the radial direction is formed at the receiving end of the receiving tube portion in a state of preventing the lock member mounted in the receiving tube portion from moving out. In the annular wall portion, a detachable second recess allowing the engaging projection of the insertion tube portion to be inserted and removed in the tube axis direction, and an engaging portion inserted into the insertion connection position through the detachable second recess. And a second retaining wall portion that prevents the movement of the tube from coming off from the tube axis direction.
The inner diameter of the first retaining wall portion of the lock member is smaller than the inner diameter of the second retaining wall portion of the annular wall portion in the receiving tube portion and larger than the outer diameter of the outer peripheral surface of the insertion tube portion. And
An arc-shaped operation body that can be freely inserted and removed from the tube axis direction into the first recess of the lock member through an annular gap between the inner peripheral surface of the annular wall portion and the outer peripheral surface of the insertion tube portion in the receiving tube portion. And a rotation operation jig integrally formed at one end of the operation main body in the tube axis direction, and the operation main body of the fixed operation jig is attached to the first recess of the lock member. The pipe connection structure comprised so that it can engage from the circumferential direction with respect to the internal-diameter side opening edge of this removal | desorption 1st recessed part in the inserted state . Between the annular holding groove of the receiving pipe portion and the lock member, the lock member is urged to move toward the pipe axis side so that the shaft core of the locking member and the pipe shaft core of the receiving pipe portion match. pipe connection structure according to claim 1, wherein the elastic ring is interposed to. 3. The pipe connection structure according to claim 1, wherein the lock member is constituted by a divided lock body that is divided into a plurality of parts in the circumferential direction, and is configured to be connectable in an annular shape or a C shape in the receiving pipe portion. . The pipe connection structure according to any one of claims 1 to 3 , wherein the lock member is formed with a knob that can be rotated from the outside of the receiving pipe. When the lock member is switched to a locked state in which the first retaining wall portion and the engaging portion of the insertion tube portion are opposed to each other in the tube axis direction, the second recess portion of the annular wall portion is removed. The pipe connection structure according to any one of claims 1 to 4, wherein a stopper portion that contacts the side end edge is formed . The receiving pipe portion is constituted by a receiving pipe main body and a receiving cover body that are divided along a radial direction within a formation region of an annular holding groove formed on an inner peripheral surface of the receiving pipe portion. the lock member in a state where the rotation operably mounted in around the pipe axis in the groove receptacle lid according to any one of the detachably mounted by being claims 1-5 against receiver pipe body Pipe connection structure. At a plurality of locations in the circumferential direction of the receiving cover body, there are formed connection locking portions protruding outward in the radial direction, and on the inner peripheral surface of the receiving pipe body, there are connection locking portions of the receiving cover body. A connecting groove that is rotatably engaged around the tube axis, and projects inward in the radial direction in a state in which the movement of the connection locking portion of the receiving lid engaged in the connecting groove is prevented from coming out. annular connecting wall portion is formed, furthermore, the annular connecting wall, the connecting recess to permit insertion and removal movement in pipe axis direction of the coupling engagement portion of the receptacle lid, connected in the groove through the coupling recess A connecting wall portion is formed which contacts the connecting locking portion from the direction of the tube axis to prevent the connecting movement when the connecting locking portion engaged with the shaft is rotated to a predetermined connection position around the tube axis. The pipe connection structure according to claim 6 . The pipe connection according to claim 6 or 7, wherein the receiving pipe main body and the receiving cover body of the receiving pipe part are divided along a radial direction at a position passing through an inner end of the annular holding groove in the pipe axis direction. Construction.

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