JP6356984B2 - Fluid pipe detachment prevention device - Google Patents

Description

  The present invention relates to a detachment prevention device that prevents detachment of a fluid pipe in the tube axis direction. More specifically, the present invention relates to a fluid pipe network in which a plurality of fluid pipes are connected, and even when an unexpected external force such as an earthquake occurs, the connection portion of the fluid pipe is connected to the pipe shaft in accordance with the external force. The present invention relates to a detachment preventing device having elasticity that expands and contracts by a predetermined permissible length in the direction, and having earthquake resistance that prevents the fluid pipe from detaching beyond the permissible length.

  In conventional disconnection prevention devices and pipe joints, a retaining member (locking member) having a plurality of protrusions (wedge portions) in a recess of a push ring (main body member) externally fitted to the outer peripheral surface of the insertion tube. A press bolt (pressing member) is provided on the press ring (main body member) accommodated, and when an external force due to an earthquake or the like occurs in the direction of detaching the insertion tube in the tube axis direction, a plurality of protrusions (wedge portions) are formed. By pressing on the outer peripheral surface of the insertion tube, a plurality of protrusions (wedges) are bitten into the insertion tube, thereby preventing the insertion tube from coming off in the tube axis direction (see, for example, Patent Document 1). .

Japanese Patent Laying-Open No. 2005-3207 (page 5-7, Fig. 1-4)

  In Patent Document 1, since the central portion of the retaining member is restrained between the press wheel and the pressing bolt, the pressing force from the pressing bolt concentrates on the protrusion at the central portion of the retaining member. On the other hand, the circumferential side portion extending to the side portion of the retaining member is not held by the pressure bolt, and the circumferential side portion of the retaining member is in a cantilever state. The side protrusions were not sufficiently pressed against the fluid pipe. As a result, the force concentrates on the projection at the center of the retaining member, excessively bites into the inlet tube, and locally damages the lining of the inlet tube, while the peripheral side portion of the retaining member is deformed. In addition, there is a problem that the protrusion on the peripheral side portion cannot sufficiently bite into the insertion tube.

  The present invention has been made paying attention to such problems, and even when an external force due to an earthquake or the like acts in a direction to detach the fluid tube, the entire wedge portion provided on the locking member is It is an object of the present invention to provide a fluid pipe detachment preventing device that can appropriately bite into the fluid pipe and can firmly maintain the fluid pipe detachment preventing function without damaging the lining of the fluid pipe.

In order to solve the above problems, a fluid pipe detachment prevention device of the present invention is provided as follows.
A main body member that is fitted on the outer peripheral surface of the fluid pipe and has a recess facing the outer peripheral surface, a central portion, a peripheral side portion that extends in the side of the central portion, is accommodated in the concave portion, and the fluid. A detachment for preventing separation of the fluid pipe in the tube axis direction, comprising: a locking member having a wedge part that can bite into an outer peripheral surface of the pipe; and a pressing part that is provided on the main body member and presses the locking member. Prevention device,
The locking member includes a contact portion where the peripheral side portion of the locking member and the concave portion are in contact with each other in a state where the central portion of the locking member and the concave portion are separated from each other, and A circumferential side inclined surface that is inclined radially inward of the fluid pipe and toward the front side in the pipe axis direction of the fluid pipe ,
Further, the locking member has a plurality of wedge portions in the front-rear direction of the tube axis on the front side in the tube axis direction of the fluid pipe with respect to the peripheral side inclined surface, and the fluid pipe is on the detachment side in the tube axis direction. When moving to, it is configured to tilt in the recess .
According to this feature, when the fluid pipe moves in the disengagement direction, the peripheral side portion of the locking member is supported by the contact portion, and the deformation of the peripheral side portion of the locking member is suppressed, and The wedge portion can surely bite into the insertion tube. On the other hand, in a state where the central portion and the concave portion of the locking member are separated from each other, the wedge portion at the central portion can appropriately bite into the insertion tube, and damage to the lining of the fluid tube can be prevented.
Further, according to this feature, the peripheral side portion of the locking member includes the peripheral side inclined surface that is inclined from the contact portion toward the radially inner side of the fluid pipe and toward the front side in the pipe axial direction of the fluid pipe. Even after the peripheral side portion comes into contact with the recess, the stop member can be further tilted and further bite into the insertion tube, so that it is possible to strongly prevent the fluid tube from coming off in the tube axis direction. it can.

The fluid pipe detachment prevention device of the present invention comprises:
A dimension of the central portion of the locking member in the tube axis direction is larger than a dimension of the circumferential side portion of the locking member in the tube axis direction.
According to this feature, since the dimension in the tube axis direction of the central portion of the locking member is formed larger than the dimension in the tube axis direction of the circumferential side portion, the bending moment applied to the circumferential side portion of the locking member is surely ensured. Can be held in.

The fluid pipe detachment prevention device of the present invention comprises:
The concave portion includes a pressing wall that contacts the peripheral side portion of the locking member, and a rear side wall that faces the central portion of the locking member.
According to this feature, the concave portion includes a pressing wall that contacts the peripheral side portion of the locking member, and a rear side wall that faces the central portion of the locking member, so when the fluid pipe moves in the disengagement direction, Since the peripheral side portion of the locking member is supported in contact with the pressing wall of the concave portion, deformation of the peripheral side portion can be reduced, and the central portion of the locking member is opposed to the rear side wall of the concave portion. The wedge part at the center presses the insertion tube while being allowed to move and tilt smoothly, so that excessive biting into the insertion tube can be prevented, and thus damage to the lining of the insertion tube can be prevented. be able to.

The pipe joint of the present invention is
It is characterized by comprising the fluid pipe, a receiving pipe into which a front end portion of the fluid pipe is inserted, and a fluid pipe detachment preventing device for preventing the fluid pipe from detaching from the receiving pipe.
According to this feature, since the pipe joint includes the fluid pipe detachment prevention device, the fluid pipe can be reliably prevented from moving toward the detachment side in the pipe axis direction.

It is a sectional side view of the separation prevention apparatus in an Example. (A) is a fragmentary sectional view of the removal prevention apparatus of the A arrow view of FIG. 1, (b) is a B arrow view of (a). (A) is a front view of the state which combined the locking member and the interposed member, (b) is a partial sectional side view of (a). FIG. (A) is XX cross section of FIG. 2, (b) is YY cross section, It is a sectional side view which shows the detachment | prevention prevention apparatus before the initial fastening of a press member. (A) is XX cross section of FIG. 2, (b) is YY cross section, It is a sectional side view which shows the detachment | prevention prevention apparatus after the initial stage fastening of a press member. (A) is XX cross section of FIG. 2, (b) is a YY cross section, and is a sectional side view showing the detachment preventing device when the insertion tube starts moving to the detachment side in the tube axis direction. . 2A is a cross-sectional view taken along the line XX in FIG. 2, and FIG. 2B is a cross-sectional view taken along the line YY, showing a detachment preventing device when the insertion tube further moves toward the detachment side of the fluid pipe in the tube axis direction. It is. 2A is a cross-sectional view taken along the line XX in FIG. 2, and FIG. 2B is a cross-sectional view taken along the line YY. It is sectional drawing.

  EMBODIMENT OF THE INVENTION The form for implementing the separation prevention apparatus which concerns on this invention is demonstrated below based on an Example.

  With reference to FIGS. 1 to 9, a separation preventing device according to an embodiment will be described. Hereinafter, the insertion side of the insertion tube 2 in FIG. 1 to the reception tube 3 is defined as the front side (front) in the tube axis direction, and the separation side of the insertion tube 2 from the reception tube 3 is the rear side in the tube axis direction ( It will be described as (back).

  As shown in FIG. 1, the pipe joint 1 of the present embodiment is a receiving pipe 3 having a receiving portion 3 a formed at an end, and a fluid pipe of the present invention inserted into the receiving portion 3 a. Along the circumferential direction between the insertion tube 2, the separation preventing device 10 provided on the outer peripheral surface 2b of the insertion tube 2, and the inner peripheral surface of the receiving port 3a and the outer peripheral surface 2b of the insertion port 2a. The sealing material 5 arranged is provided. Further, the sealing material 5 is pressed in the tube axis direction by an annular convex portion 11d formed on the body member 11 to be described later, and the sealing material 5 has an inner peripheral surface of the receiving portion 3a and an outer peripheral surface 2b of the insertion portion 2a. The receiving tube 3 and the insertion tube 2 are connected in a sealed manner.

  In addition, the pipe joint 1 in this invention is a part of piping which comprises a pipe network, Comprising: These receiving pipes 3 and insertion pipes 2 are made from the ductile cast iron for waterworks embed | buried in the ground, for example. Yes, the inner peripheral surface of the tube is covered with a mortar layer. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel, or made of asbestos, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe with powder coating. In the present embodiment, the fluid in the fluid pipe is not limited to the clean water of the present embodiment, but may be, for example, industrial water, agricultural water, sewage, etc., or a gas-liquid mixture of gas and gas and liquid. Absent.

  Moreover, as shown in FIG. 1, the detachment prevention device 10 according to the present invention disposed on the outer peripheral surface 2b of the insertion tube 2 is externally fitted to the outer peripheral surface 2b of the insertion tube 2 and faces the outer peripheral surface 2b. A main body member 11 having a concave portion 12 to be tilted, a locking member 15 that is tiltably accommodated in the concave portion 12 and that can bite into the outer peripheral surface 2b of the insertion tube 2, and a main body member 11 that is provided with the locking member 15. It is mainly comprised from the press part which consists of the volt | bolt 13 which is a press member to press, and the interposition member 14. FIG.

  In the detachment prevention device 10, the main body member 11 is connected and fixed to the receiving port 3 a by the fastening member 4, and the locking member 15 housed in the recess 12 of the main body member 11 is described later as the insertion tube 2 By engaging with the outer peripheral surface 2b, it is possible to prevent the insertion portion 2a from being detached from the receiving portion 3a. Hereinafter, members constituting the detachment prevention device 10 will be described.

  First, the main body member 11 will be described. As shown in FIGS. 1, 2, and 4, the main body member 11 is an annular integral presser ring that can be externally fitted to the outer peripheral surface 2 b of the insertion tube 2, and includes ductile cast iron, stainless steel, steel, and cast steel. Etc. are formed. The main body member of the present invention may have a structure that can be divided into a predetermined number in the circumferential direction. A plurality of recesses 12 are formed along the circumferential direction in the inner peripheral portion of the main body member 11 facing the outer peripheral surface 2b of the insertion tube 2. In each recess 12, a front side wall 12 a and a pressing wall 12 b formed at predetermined intervals in the tube axis direction of the insertion tube 2, and peripheral side walls 12 d and 12 d formed in the circumferential direction of the insertion tube 2. Further, the space is surrounded by the bottom wall 12c, and the recess 12 further includes a bottom accommodating portion 12e for accommodating the interposed member 14. In the recess 12, a locking member 15 and an interposition member 14 described later are accommodated.

  As shown in FIGS. 2A and 4, the main body member 11 includes a flange portion 11 a and accommodating portions 11 b each having a concave portion 12 formed alternately in the circumferential direction. The main body member 11 and the receiving pipe 3 are fixed integrally by being fastened by the flange portion 3b of the pipe 3 and the fastening member 4. The accommodating portion 11b is formed with the above-described recess 12 in the inner peripheral portion thereof, and a female screw portion 11c is provided radially in the outer peripheral portion of the accommodating portion 11b. A bolt 13 which is a pressing member of the present invention is screwed into the female screw portion 11c, and the locking member 15 is fastened to the outer peripheral surface 2b of the inlet tube 2 via the interposed member 14 by tightening the bolt 13. It can be pressed.

  Further, as shown in FIGS. 1 and 4, an annular convex portion 11 d that presses the sealing material 5 is formed on the end surface of the main body member 11 that faces the receiving portion 3 a. The seal material 5 is pressed in the tube axis direction by the annular convex portion 11d by tightening the fastening member 4, and the receiving portion 3a and the insertion portion 2a are connected in a sealed manner.

  Next, the locking member 15 will be described. As shown in FIGS. 3A, 3 </ b> B, and 4, the locking member 15 has a polygonal shape that is asymmetric in a circumferential side view and a side sectional view, and has an arcuate front wedge portion 17 in the inner circumferential portion. The rear wedge portion 16 and the auxiliary wedge portion 18 are substantially arcuate members having a predetermined width in the circumferential direction. The locking member 15 is made of ductile cast iron, steel, stainless steel or the like.

As shown in FIGS. 3 (a) and 3 (b), the locking member 15 is formed with a convex portion 15b having an inclined surface 15a on the outer peripheral portion at the center in the circumferential direction. It is Nitsu toward the front side of the second tube-axis direction and expanded away from the outer peripheral surface 2b of the inserted pipe 2 is inclined. Further, the inclined surface 15a is formed with a convex end surface 15f substantially orthogonal to the tube axis on the rear side in the tube axis direction, and the convex end surface 15f is connected to the circumferential side portion 15k via the inclined surfaces 15h and 15j. It is connected to. The convex end surface 15f constitutes the central portion 15g of the present invention.

  The circumferential side portion 15k is formed in a substantially bow shape having a predetermined width on both sides in the circumferential direction from the central portion 15g. As shown in FIG. 2B, the front side wall 15p of the locking member 15 faces the front side wall 12a of the recess 12, and the peripheral side inclined surface 15m of the peripheral side portion 15k of the locking member is The locking member can be moved and tilted between the front side wall 12a of the recess 12 and the pressing wall 12b, as will be described later.

As shown in FIG. 8 (b), the peripheral side inclined surface 15m of the locking member 15 increases from the abutment portion 15n toward the radially inner side (inner diameter direction) of the insertion tube 2 and the insertion tube 2 It is inclined at a predetermined angle suited to the tube axis direction front side Migihitsuji.

The plurality of wedge parts 16, 17, 18 are formed on the side of the locking member 15 facing the outer peripheral surface 2 b of the insertion tube 2 with a predetermined interval in the tube axis direction. Of the inclined surfaces 15a of the locking member 15, on the front side of the tube radial distance is relatively large tube axial direction from the outer surface of the inserted pipe 2, the front wedge portion 17 is formed, of the inclined surface 15a A rear wedge portion 16 is formed on the rear side in the tube axis direction in which the distance in the tube diameter direction from the outer surface of the insertion tube 2 is relatively small. Further, the front wedge portion 17 and the rear wedge portion 16 An auxiliary wedge portion 18 is formed between the tube axis directions.

As shown in FIG. 4, the cross-sectional shape of each wedge portion 16, 17, 18 is inserted substantially perpendicularly to the surface inclined toward the front side in the tube axis direction of the insertion tube 2 and the outer peripheral surface of the insertion tube 2. tube radially outwardly of the mouth tube 2 has a triangle consisting extending surface (outer radial direction), and has a tapered shape toward the outer circumferential surface of the inserted pipe 2 from its proximal end.

Further, as shown in FIGS. 2 (a), 3 (a), and 3 (b), the inner diameter dimension (radial dimension in the tube axis direction view) and the circumferential direction of the arcuate wedge portions 16, 17, 18 are shown. When the locking member 15 is pressed by the bolt 13 or when the locking member 15 is tilted as will be described later, the dimensions bite into the inlet tube 2 over substantially the entire length in the circumferential direction of each wedge portion 16, 17, 18. Set to dimensions. The circumferential length S1 of the front wedge portion 17 and the rear wedge portion 16 is formed substantially the same, and is set to be larger than the circumferential length S2 of the auxiliary wedge portion 18. Further, the protruding amount in the inner diameter direction of the auxiliary wedge portion 18 is set to be smaller than the protruding amounts in the inner diameter direction of the front wedge portion 17 and the rear wedge portion 16, and more specifically, as shown in FIGS. 3 (a) and 3 (b). As shown in the drawing, the tip in the inner diameter direction of the arcuate auxiliary wedge portion 18 is a position that is a predetermined dimension δ radially outward (outer diameter direction) from the line connecting the tip of the front wedge portion 17 and the tip of the rear wedge portion 16. Is set to

Next, the interposed member 14 will be described. The interposed member 14 constitutes a pressing portion together with a bolt 13 as a pressing member. As shown in FIGS. 3A, 3 </ b> B, and 4, the interposed member 14 has a groove along the tube axis direction of the fluid pipe, and the bottom of the groove has a tapered surface 14 a. The interposed member 14 is disposed so that the groove portion covers the convex portion 15b of the locking member 15, and the tapered surface 14a of the interposed member 14 and the inclined surface 15a of the convex portion 15b are slidably in contact with each other, The locking member 15 can be moved along the tapered surface 14a of the interposed member 14 or tilted by contacting the tapered surface 14a .

  The above-mentioned main body member 11, the locking member 15, the detachment preventing device 10 including the bolt 13 and the interposition member 14 are assembled as follows. As shown in FIGS. 1, 2, and 4, the interposed member 14 is accommodated in the bottom accommodating portion 12 e of the main body member 11, and the elastic body 19 is inserted into the fitting groove 15 d at the circumferential end of the locking member 15. The holding member 15 is inserted into the concave portion 12 of the main body member 11 while the holding member 15 is held in the concave portion 12. Further, the body member 11 in which the interposition member 14 and the locking member 15 are accommodated is externally fitted to the insertion portion 2a of the insertion tube 2 in a loosely fitted state, and the outer peripheral surface 2b of the insertion portion 2a on the front end side thereof. The sealing material 5 is externally fitted at a predetermined position.

  Next, the insertion part 2a fitted with the main body member 11 and the sealing material 5 is inserted into the receiving part 3a, and the sealing member 5 is pressed between the insertion part 2a and the receiving part 3a by the fastening member 4. While the main body member 11 is fastened to the receiving tube 3 and set at the initial assembly position, the bolt 13 screwed into the female screw portion 11c of the housing portion 11b of the main body member 11 is screwed in, and the bolt 13 is Perform initial tightening with a predetermined tightening torque.

  Hereinafter, the behavior of the detachment prevention device 10 when a force is applied in the detachment direction of the tube shaft of the insertion tube 2 from the start of the initial tightening of the bolt 13 screwed to the main body member 11 will be described.

  As shown in FIGS. 5A and 5B, the center of the bolt 13 screwed to the main body member 11 is located on the rear side of the tube axis from the center position of the length dimension of the interposed member 14 in the tube axis direction. The position is set to a position shifted to the rear side of the tube axis from the position of the rear wedge portion 16 of the locking member 15. Further, gaps are formed between the interposed member 14 and the bottom accommodating portion 12e and between the locking member 15 and the recessed portion 12 to allow movement and tilting of the interposed member and the locking member 15. Therefore, when the bolt 13 is lightly tightened for the first time, the interposed member 14 moves to the rear side in the tube axis direction of the insertion tube 2 and is in a state where it is lightly in contact with the rear side wall 12f of the bottom accommodating portion 12e or locked. The member 15 is set in a state in which the member 15 is lightly in contact with the front side wall 12a of the recess 12 of the main body member 11 while being inclined counterclockwise. In a state where the locking member 15 is tilted counterclockwise, the rear wedge portion 16 slightly contacts the outer peripheral surface 2b of the insertion tube 2, and the front wedge portion 17 and the auxiliary wedge portion 18 are connected to the insertion tube. 2 is in a non-contact state with clearances c1 and c2 from the outer peripheral surface 2b.

  Next, as shown in FIGS. 6A and 6B, when the bolt 13 is tightened with a predetermined initial tightening torque, the center of the bolt 13 is the rear wedge portion 16 of the locking member 15. Since it is set in a state shifted from the position to the rear side of the pipe axis, the interposed member 14 is strongly pressed against the rear side wall 12f of the bottom accommodating portion 12e by the initial tightening force by the bolt 13, or the locking member 15 The front side wall 15p is strongly pressed against the front side wall 12a of the recess 12. At the same time, the initial tightening force by the bolt 13 mainly concentrates on the rear wedge portion 16 of the locking member 15, and the rear wedge portion 16 mainly bites into the outer peripheral surface 2 b of the insertion tube 2. The front wedge portion 17 is not in contact with the insertion tube 2 or lightly in contact therewith, and the auxiliary wedge portion 18 is kept in a non-contact state with the clearance c3 from the outer peripheral surface 2b of the insertion tube 2. In addition, since the pressing surface 13a of the bolt 13 is formed in a flat surface, the bolt 13 can press the pressed surface 14b of the interposed member 14 in a wide range, so that the wedge portions 16, 17, and 18 are moved in the circumferential direction. A pressing force can be applied over substantially the entire length.

Next, when a detachment force acts in the tube axis direction of the insertion tube 2 from this initial tightened state, the insertion of the rear wedge portion 16 of the locking member 15 is performed as shown in FIGS. 7 (a) and 7 (b). the biting projections point mouth tube 2 moves together with the inserted pipe 2 to the tube axis direction rear side, the locking member 15 is more pressed against the interposed member 14 with a wedge effect. The locking member 15 tilts clockwise around the biting point of the rear wedge portion 16, and the rear wedge portion 16 and the front wedge portion 17 bite into the outer peripheral surface 2 b of the insertion tube 2, and the auxiliary wedge The part 18 is in a state of non-contact or light contact with the outer peripheral surface 2 b of the insertion tube 2. In this state, the detachment force in the tube axis direction of the insertion tube 2 is held by the two wedge portions of the front wedge portion 17 and the rear wedge portion 16 of the locking member 15.

When the insertion tube 2 further moves to the tube axis direction detachment side, as shown in FIG. 8A, the biting portion point of the insertion tube 2 of the rear wedge portion 16 of the locking member 15 is the insertion port. with the tube 2 moves further to the tube axis direction rear side, the locking member 15 is more pressed against the interposed member 14 with a wedge effect, around the biting portion point of the rear wedge portion 16, it tilts clockwise, after The amount of biting of the side wedge portion 16 and the front wedge portion 17 into the outer peripheral surface 2b of the insertion tube 2 further increases. This time, the auxiliary wedge portion 18 starts to bite into the insertion tube 2. When the auxiliary wedge portion 18 starts to bite into the insertion tube 2, the pressing force from the interposed member 14 to the locking member 15 is also held by the auxiliary wedge portion 18. Biting into the outer peripheral surface 2b is restricted. In this state, the detachment force in the tube axis direction of the insertion tube 2 is held by the three wedge portions of the front wedge portion 17, the rear wedge portion 16 and the auxiliary wedge portion 18.

  At the same time, as shown in FIG. 8 (b), when the insertion tube 2 moves rearward in the tube axis direction, the vicinity of the contact portion 15n of the locking member 15 contacts the pressing wall 12b of the recess 12, The movement of the intubation tube 2 almost stops. When the vicinity of the contact portion 15n of the peripheral side portion 15k of the locking member 15 starts to contact the pressing wall 12b of the concave portion 12, the pressing of the peripheral side inclined surface 15m of the locking member 15 and the concave portion 12 is performed. Between the wall 12b, it has the space | gap L2 which becomes wide toward the radial direction inner side of the insertion tube 2. As shown in FIG.

  Then, as shown in FIGS. 9A and 9B, the locking member 15 is finally tilted around the contact portion 15n by the pressing force from the interposed member 14 due to the wedge effect. Thus, the peripheral side inclined surface 15m comes into contact with the pressing wall 12b, and the movement of the insertion tube 2 stops, and the locking member 15 is wedged 16, 17 and 17 by tilting around the contact portion 15n. The three wedge portions 18 can bite into the insertion tube 2 and prevent the insertion tube 2 from being detached in the tube axis direction.

In addition, the shape and size of the wedge portion are set with a sufficient margin with respect to the separation force assumed in the design. Therefore, even if the detachment force assumed in the design is applied to the detachment preventing device and the wedge part bites into the insertion tube 2, the bottom 15 e between the wedge parts 16, 17, 18 is formed on the outer peripheral surface 2 b of the insertion tube 2. It is set to be separated without touching. In this setting , when the bottom portion 15e between the wedge portions 16, 17, and 18 comes into contact with the outer peripheral surface 2b of the insertion tube 2, the wedge portions 16, 17, and 18 can bite into the insertion tube 2 any more. This is for the purpose of preventing the inability to maintain a greater separation force. Further, in this setting , when the bottom portion 15e between the wedge portions 16, 17, 18 contacts the outer peripheral surface 2b of the insertion tube 2, the insertion tube 2 is connected to the bottom portion between the wedge portions 16, 17, 18 and the wedge portion. in response to a large pressing force from both the 15e, inserted pipe 2 is greatly reduced in diameter, it is for the purpose of preventing damage to the lining of the outer peripheral surface and inner peripheral surface.

  The separation preventing device of the present invention has the following operational effects.

As shown in FIGS. 8A and 9A, the convex end surface 15 f of the central portion 15 g of the locking member 15 does not contact the rear side wall 12 f of the concave portion 12, and the locking member 15 While the central portion 15g is allowed to move and tilt appropriately, the wedge portions 16, 17, and 18 near the central portion 15g of the locking member 15 press the insertion tube 2. Excessive bite can be prevented. That is, the central portion 15g of the locking member 15, because it is supported directly by the bolts 13 and interposition member 14, the central portion 15g of the locking member 15 is hardly be deformed, in the vicinity of the Hisashi Naka portion 15g wedge The parts 16, 17, and 18 bite excessively into the intubation tube 2. For this reason, the supporting rigidity of the central portion 15g of the locking member 15 is weakened in a state where the convex end surface 15f of the central portion 15g of the locking member 15 is separated from the rear side wall 12f of the concave portion 12, so By allowing the movement and tilting, excessive biting of the wedge portions 16, 17, 18 near the central portion 15 g of the locking member 15 can be prevented.

  Further, the central portion 15g of the locking member 15 is pressed and supported immediately above by the bolt 13 and the interposed member 14, but the peripheral side portion 15k of the locking member 15 is directly supported by the bolt 13 and the interposed member 14. Not done. As a result, the peripheral side portion 15k of the locking member 15 is in a cantilever state and is not sufficiently pressed against the insertion tube 2, and the wedge portions 16, 17, 18 of the peripheral side portion 15k of the locking member 15 are inserted. Cannot bite into the mouth tube 2 sufficiently.

  Therefore, as shown in FIG. 8B, when the vicinity of the contact portion 15n of the peripheral side portion 15k of the locking member 15 comes into contact with the pressing wall 12b of the recess 12, the periphery of the locking member 15 is removed. The side portion 15k is supported by the pressing wall 12b of the concave portion 12, and deformation of the peripheral side portion 15k of the locking member 15 can be suppressed. Then, as shown in FIGS. 9A and 9B, the locking member 15 tilts around the vicinity of the contact portion 15n in a state where the deformation of the peripheral side portion 15k of the locking member 15 is suppressed. Therefore, the wedge portions 16, 17, 18 near the peripheral side portion 15k of the locking member 15 can surely bite into the insertion tube 2, and the insertion tube 2 can be surely detached in the tube axis direction. It can prevent powerfully.

  As shown in FIG. 8B, the circumferential side portion 15k of the locking member 15 is a circumferential side inclined surface that is inclined from the contact portion 15n toward the radially inner side of the insertion tube 2 and toward the front side in the tube axis direction. 15m, the locking member 15 is further tilted even after the circumferential side portion 15k abuts against the recess 12, and the wedge portion of the circumferential side portion 15k of the locking member 15 is inserted into the insertion tube. Since it can bite further into 2, the separation of the insertion tube 2 in the tube axis direction can be strongly prevented.

  As shown in FIG. 3, since the dimension in the tube axis direction of the central portion 15g of the locking member 15 is formed larger than the dimension in the tube axis direction of the peripheral side portion 15k of the locking member 15, the locking member The bending moment applied to the 15 peripheral side portions 15k can be reliably held.

Since the recessed portion 12 includes a pressing wall 12b that contacts the peripheral side portion 15k of the locking member 15 and a rear side wall 12f that faces the central portion 15g of the locking member 15, the insertion tube has moved in the removal direction. At this time, since the peripheral side portion 15k of the locking member 15 is supported by being in contact with the pressing wall 12b of the recess 12, deformation of the peripheral side portion 15k can be reduced. The central portion 15g of the locking member 15, since the side wall 12f facing after the recess 12, the wedge portion of the central portion 15g is moderate movement, while being allowed to tilt, to press the interpolation port tube 2 Therefore, excessive biting into the insertion tube 2 can be prevented, and damage to the lining of the insertion tube can be prevented.

  The pipe joint 1 includes an insertion tube 2, a receiving tube 3 into which the front end 2 c of the insertion tube 2 is inserted, and a detachment prevention device 10 that prevents the insertion tube 2 from being detached from the receiving tube 3. Since it is provided, the pipe joint 1 can reliably prevent the insertion tube 2 from being detached from the receiving tube 3.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, the main body member 11 provided with the recess 12 is described as a push ring fixedly connected to the receiving pipe 3 with the fastening member 4. For example, the main body member 11 is connected to a pipe joint. Reinforcing metal fittings for increasing the strength may be used, or the main body member may be a receiving tube itself into which an insertion tube as a fluid tube is inserted, and the locking member 15 is accommodated in the receiving portion of the receiving tube. A recess may be formed.

  Moreover, in the said Example, although the volt | bolt 13, the interposed member 14, and the latching member 15 contact | abut each surface directly or slidably contact, for example, all or a part of the surface of an interposed member You may coat | cover with a rubber lining etc., or you may provide the shock absorbing material which consists of rubber | gum, resin, etc. in the taper surface of an interposed member, or the inclined surface of a locking member. According to such a configuration, when an external force such as an earthquake repeatedly acts before and after in the tube axis direction, it is possible to absorb an impact applied to each member in the recess.

1 Pipe joint 2 Insertion pipe (fluid pipe)
2b Outer peripheral surface 2c Front end portion 3 Receptacle tube 4 Fastening member 5 Sealing material 10 Detachment prevention device 11 Main body member 12 Recess 12b Press wall 12f Rear side wall 13 Bolt (press portion)
14 Interposition member (pressing part)
15 locking member 15g central part 15f convex part end face 15k peripheral side part 15m peripheral side inclined surface 15n contact part 16 rear wedge part 17 front wedge part 18 auxiliary wedge part 19 elastic body

Claims (4)

A main body member that is fitted on the outer peripheral surface of the fluid pipe and has a recess facing the outer peripheral surface, a central portion, a peripheral side portion that extends in the side of the central portion, is accommodated in the concave portion, and the fluid. A detachment for preventing separation of the fluid pipe in the tube axis direction, comprising: a locking member having a wedge part that can bite into an outer peripheral surface of the pipe; and a pressing part that is provided on the main body member and presses the locking member. Prevention device,
The locking member includes a contact portion where the peripheral side portion of the locking member and the concave portion are in contact with each other in a state where the central portion of the locking member and the concave portion are separated from each other, and A circumferential side inclined surface that is inclined radially inward of the fluid pipe and toward the front side in the pipe axis direction of the fluid pipe ,
Further, the locking member has a plurality of wedge portions in the front-rear direction of the tube axis on the front side in the tube axis direction of the fluid pipe with respect to the peripheral side inclined surface, and the fluid pipe is on the detachment side in the tube axis direction. An apparatus for preventing the separation of a fluid pipe, wherein the apparatus is configured to tilt in the concave portion when moving to the position . The dimensions of the tube axis direction of the central portion of the locking member, according to claim 1, characterized in that larger formed than the dimensions of the tube axis direction of the peripheral side portion of the locking member Detachment prevention device for fluid pipes. The said recessed part is equipped with the press wall which contact | abuts to the said surrounding side part of the said locking member, and the rear side wall facing the said center part of the said locking member, The Claim 1 or 2 characterized by the above-mentioned. Detachment prevention device for fluid pipes. The fluid pipe according to any one of claims 1 to 3 , wherein the fluid pipe, a receiving pipe into which a front end portion of the fluid pipe is inserted, and a separation of the fluid pipe from the receiving pipe are prevented. A pipe joint comprising the device.

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