JP6356983B2 - 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 the conventional detachment prevention device and pipe joint, there is a wedge member (locking member) having a plurality of wedge portions in a recess of a push ring (main body member) fitted on the outer peripheral surface of the insertion tube (fluid tube). A mediating member (intervening member) provided with a taper surface when an external force caused by an earthquake or the like is generated in a direction to detach the fluid pipe in the pipe axis direction. ) To press the locking member against the outer peripheral surface of the fluid pipe, the wedge portion is bitten into the fluid pipe to prevent the fluid pipe from being detached in the pipe axis direction (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 58-31027 (page 3, FIG. 3)

  However, in Patent Document 1, when an external force due to an earthquake or the like repeatedly occurs in a direction in which the fluid pipe is detached and in a direction in which the fluid pipe is inserted in the opposite direction, it is arranged in the recess without any gap in the pipe axis direction. The intermediate member (intermediate member) that has been collided with the contact surface of the pressing member and the locking member a number of times due to repeated external forces in the tube axis direction, and collided many times. There is a risk that the fluid pipe may be damaged, and as a result, the fluid pipe detachment preventing function is significantly impaired.

  The present invention has been made paying attention to such problems, and even when a repeated external force is generated in the tube axis direction, the locking member, the pressing member, and the interposed member collide with each other in a locally concentrated manner. It is an object of the present invention to provide a fluid pipe detachment prevention device that can prevent damage to these members without causing damage, and that can maintain the fluid pipe detachment prevention function firmly.

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 externally fitted to the outer peripheral surface of the fluid pipe and has a recess facing the outer peripheral surface; a locking member that is tiltably accommodated in the recess and can bite into the outer peripheral surface of the fluid pipe; and the main body A pressing member that is provided on the member and presses the locking member so as to bite into the outer peripheral surface of the fluid pipe, and an interposed member that is interposed between the locking member and the pressing member, A separation prevention device for preventing separation of the fluid pipe in the tube axis direction,
The locking member has a plurality of wedge portions in the front-rear direction of the pipe axis of the fluid pipe, and is configured to tilt in the recess when the fluid pipe moves to the detachment side in the pipe axis direction. And
The interposed member includes a tapered surface that abuts on an outer surface of the locking member, and is accommodated in the recess with a movement allowance of a predetermined width in the tube axis direction of the fluid pipe. Yes.
According to this feature, even when an external force is applied to the fluid pipe to be removed or inserted in the pipe axis direction, the interposed member between the locking member and the pressing member is moved in the pipe axis direction within the recess of the main body member. As the taper surface of the interposed member transitions the contact portion with the outer surface of the locking member, the external force in the direction of the tube axis that causes the fluid tube to be detached and inserted is repeated. In addition, the locking member, the pressing member, and the interposition member can disperse each other's contact points without locally concentrating and colliding with each other, thereby preventing damage to these members due to repeated concentrated collisions. As a result, the function of preventing the separation of the fluid pipe can be firmly maintained, and the piping structure at the beginning of connection can be maintained well.

The fluid pipe detachment prevention device of the present invention comprises:
The outer surface of the locking member is formed as an inclined surface that abuts substantially parallel to the tapered surface of the interposed member.
According to this feature, since the tapered surface of the interposed member and the inclined surface of the locking member both contact substantially parallel in an inclined state, the external force acting in the tube axis direction is not received straight, An external force can be received by sliding contact between parallel surfaces inclined with respect to the tube axis direction.

The fluid pipe detachment prevention device of the present invention comprises:
The interposed member includes a pressed surface that is tiltably contacted with the pressing surface of the pressing member.
According to this feature, the interposition member is moved by tilting the interposition member with respect to the pressing member as the interposition member moves within the recess of the main body member in the tube axis direction with an allowance of a predetermined width. Also, the pressing force, the interposed member, and the locking member can be held without being separated from each other.

The fluid pipe detachment prevention device of the present invention comprises:
The pressing member is provided on the main body member so as to be movable back and forth in the radial direction of the fluid pipe.
According to this feature, since the pressing member is provided in the main body member so as to be able to advance and retract in the radial direction of the fluid pipe, an operation means such as a tool is provided on the outer surface of the fluid pipe in the operation of moving the pressing member in the radial direction Will not be interfered with.

The fluid pipe detachment prevention device of the present invention comprises:
A rear edge of the pressing surface of the pressing member, a rear end surface of the interposed member, and a rear end surface of the locking member are arranged in this order from the rear side in the tube axis direction of the fluid pipe.
According to this feature, since the interposed member does not contact the rear edge of the pressing surface of the pressing member, the rear edge can be prevented from being damaged, and the tilting center of the interposed member and the tilting center of the locking member can be prevented. Since it can be made different in the tube axis direction, variations in the tilting modes of the interposition member and the locking member can be increased, and the locking member can be constantly pressed in accordance with various directions and sizes of the external force.

The pipe joint of the present invention is
The fluid pipe includes a 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 fluid pipe can be firmly prevented from being detached from the receiving pipe by using the fluid pipe detachment preventing device, it is possible to provide a pipe joint having excellent earthquake resistance and stretchability.

It is a sectional side view which shows the pipe joint provided with the detachment | desorption 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 a sectional side view showing the behavior of the separation preventing device when the insertion tube starts to move from the initial tightening state to the tube axis direction separation side, and (b) is a side sectional view showing the behavior of the separation tube. It is a sectional side view which shows the behavior of the removal prevention apparatus when it further moves to the pipe-axis direction detachment side. (A) is a sectional side view showing the behavior of the separation preventing device when the insertion tube moves to the insertion side of the fluid tube in the tube axis direction, and (b) is the tube shaft of the fluid tube again. It is a sectional side view which shows the behavior of the separation prevention apparatus when moving to the direction separation side. It is a sectional side view which shows the modification 1 of an interposed member. It is a sectional side view which shows the modification 2 of an interposed member. It is a sectional side view which shows the condition which fastens the volt | bolt of a detachment | leave prevention apparatus.

  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 and the interposition member 14 which are the press members which play the role to press.

  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. Each recess 12 has a front side wall 12a and a rear side wall 12b formed at predetermined intervals in the tube axis direction of the insertion tube 2, and peripheral side walls 12d and 12d 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. 3B and 4, the locking member 15 has a polygonal shape that is asymmetrical in a circumferential side view and a side sectional view, and as shown in FIG. It comprises a substantially arcuate member having a predetermined width in the circumferential direction provided with an arcuate front wedge portion 17, a rear wedge portion 16, and an auxiliary wedge portion 18 as a protruding portion. The locking member 15 is made of ductile cast iron, steel, stainless steel or the like. The locking member 15, the convex portion 15b is formed with an inclined surface 15a on the outer peripheral portion of the central circumferential, inclined surfaces 15a is being Nitsu towards the front side of the tube axis direction of the inserted pipe 2 inserted The diameter is increased and tilted away from the outer surface of the mouth tube 2.

The plurality of wedge portions 16, 17, and 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 as a protruding portion of the present invention is formed between the tube axis directions.

  As shown in FIG. 4, the cross-sectional shape of each wedge portion 16, 17, 18 has a diameter substantially perpendicular 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. Each wedge portion 16, 17, 18 has a tapered shape inclined toward the front side in the tube axis direction from the base end toward the outer peripheral surface of the insertion tube 2. Yes.

Further, as shown in FIGS. 2 (a), 3 (a), and 3 (b), the inner diameter dimension (radius dimension in the tube axis direction view) of the arcuate wedge portions 16, 17, and 18 and the circumferential direction. 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 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 as a protruding portion. 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 pipe joint 1 when an external force such as an earthquake repeatedly acts before and after the pipe axis direction on the pipe joint 1 including the above-described detachment preventing device 10 will be described.

  As shown in FIG. 5A, in the initial tightening state before an external force such as an earthquake is applied, the pressing force by the tightened bolt 13 is transmitted to the locking member 15 via the interposed member 14, and the locking is performed. At least the rear wedge portion 16 of the member 15 bites into the outer peripheral surface of the insertion tube 2. In this initial state, only the rear wedge portion 16 may bite into the outer peripheral surface of the insertion tube 2, or the front wedge portion 17 may bite in addition to the rear wedge portion 16.

  In this initial tightening state, the pressing force in the radial direction of the insertion tube 2 by the bolt 13 branches in the tube axis direction due to surface contact between the tapered surface 14a of the interposed member 14 and the inclined surface 15a of the locking member 15. Thus, the interposition member 14 is disposed at the rear portion in the recess 12 and the locking member 15 is disposed at the front portion in the recess 12. That is, in the present embodiment, the tapered surface 14a of the interposing member 14 and the inclined surface 15a of the locking member 15 are both formed in a flat shape that is inclined substantially parallel to each other in this initial tightening state. The tapered surface 14a and the inclined surface 15a are in surface contact with each other.

  At this time, the position (P1) of the rear edge 13b of the pressing surface 13a of the bolt 13, the position (P2) of the rear end surface 14c of the interposed member 14, and the rear end surface of the locking member 15 in this order from the rear side in the tube axis direction. Each member 13, 14, 15 is arrange | positioned so that it may become the position (P3) of 15c.

  In this initial tightening state, a gap K is formed on the front side of the interposition member 14 in the recess 12 to allow the interposition member 14 to move in a predetermined width in the tube axis direction and to tilt at a predetermined angle. In other words, the interposed member 14 is disposed in the recess 12 so as to be movable and tiltable in the tube axis direction.

  Next, as shown in FIGS. 5 (a) and 5 (b), when an external force acts on the insertion tube 2 rearward in the tube axis direction, that is, in a direction away from the reception tube 3, the insertion tube 2. The locking member 15 that bites into the outer peripheral surface in the initial tightening state moves rearward in the tube axis direction in the recess 12 along with the insertion tube 2. As the inclined surface 15a of the locking member 15 slides along the tapered surface 14a of the interposed member 14 due to this external force, a part of the external force in the tube axis direction becomes a component force in the direction orthogonal to the tapered surface 14a (FIG. 5). (See (a)), the locking member 15 is pressed in the inner diameter direction of the insertion tube 2, and the rear wedge portion 16 and the front wedge portion 17 of the locking member 15 further bite into the outer peripheral surface 2 b of the insertion tube 2.

  Further, as shown in FIG. 5 (b), the reaction force against the biting of the rear wedge portion 16 and the front wedge portion 17 acts, so that the interposed member 14 comes into surface contact with the pressing surface 13 a of the bolt 13. It tilts clockwise in the figure with a part of the rear end side of the pressed surface 14b as the center of tilting. At this time, as described above, the position (P2) of the rear end surface 14c of the interposition member 14 is disposed forward of the position (P1) of the rear edge 13b of the pressing surface 13a of the bolt 13 in the tube axis direction. The tilting center of the interposed member 14 does not slidably contact the rear edge 13b of the pressing surface 13a of the bolt 13, and damage to the rear edge 13b can be avoided.

  Further, as the interposed member 14 is tilted, the pressed surface 14b of the interposed member 14 is inclined with respect to the pressing surface 13a of the bolt 13, so that the front side of the pressed surface 14b of the interposed member 14 and the bolt 13 are A shock absorbing gap R1 to be described later is formed between the pressing surface 13a.

  Next, as shown in FIG. 6A, when an external force is applied to the insertion tube 2 in the tube axial direction, that is, in the direction of insertion into the receiving tube 3, the outer surface of the insertion tube 2 is applied. The engaging member 15 that has bitten moves in the recess 12 along the insertion tube 2 forward in the tube axis direction. And the front-end part 2c of the insertion tube 2 contact | abuts to the inner end surface 3c of the receiving tube 3, and the movement of the insertion tube 2 is controlled and complete | finishes. Thus, when the movement of the insertion tube 2 is finished, the gap between the front surface of the locking member 15 and the front side wall 12a of the recess 12 remains, and the locking member 15 does not collide with the recess 12. The damage of the locking member 15 can be avoided. Note that a cushioning material that cushions an impact caused by contact may be provided between the front end 2 c of the insertion tube 2 and the inner end surface 3 c of the receiving tube 3.

Further, as shown in FIG. 6A , as the insertion tube 2 moves, the gap (R2) between the pressing surface 13a of the bolt 13 and the pressed surface 14b of the interposed member 14 increases. For this reason, the interposed member 14 appropriately moves between the bolt 13 and the locking member 15 in the recess 12 according to gravity. For example, as shown in FIG. 6A, the pressed surface 14 b of the interposed member 14 is separated from the pressed surface 13 a of the bolt 13, and the tapered surface of the interposed member 14 and the inclined surface 15 a of the locking member 15. And the contact location between these members 14 and 15 changes.

  Next, as shown in FIG. 6 (b), when an external force acts on the insertion tube 2 again in a direction away from the receiving tube 3, the locking member that bites into the outer peripheral surface of the insertion tube 2. 15 moves backward in the tube axis direction in the recess 12 along with the insertion tube 2. Due to this external force, the inclined surface 15 a of the locking member 15 slides along the tapered surface 14 a of the interposed member 14, and a predetermined portion of the pressed surface 14 b of the interposed member 14 contacts the pressing surface 13 a of the bolt 13. Touch.

  Since the contact portion of the pressing surface 13a of the bolt 13 that contacts the pressed surface 14b of the interposed member 14 is a predetermined portion in the tube axis direction from the position (P1) of the rear edge 13b, the rear edge 13b. Can avoid damage. Moreover, the contact location of the pressed surface 14b of the interposed member 14 and the pressing surface 13a of the bolt 13 in FIG. 6B is a new location different from the contact location in FIG. 5A described above. .

  Further, the pressed surface 14b of the interposed member 14 in FIG. 6B is inclined with respect to the pressed surface 13a of the bolt 13, and the front side of the pressed surface 14b of the interposed member 14 and the pressed surface 13a of the bolt 13. Since a clearance (R3) for shock absorption is generated between the intermediate member 14 and the interposed member 14 in contact with the new location, the clearance (R3) for shock absorption temporarily tilts with the allowance as an allowance, This impact can be absorbed without the intervention member 14 and the bolt 13 colliding with a strong momentum.

  Similarly, when an external force such as an earthquake is repeatedly applied to the pipe joint 1 before and after in the pipe axis direction, the external force is applied to the pipe without causing the intervening member 14 and the bolt 13 to be locally concentrated and in contact with each other. Since the contact portion between the interposed member 14 and the bolt 13 is dispersed every time it is repeated before and after in the axial direction, damage due to repeated concentrated impact between the members can be avoided.

  Next, a modified example of the interposed member of the present invention will be described. As shown in FIG. 7, the interposed member 24 as the first modified example of the present invention has a tapered surface 24a formed in a concave curved surface. In the initial state of the pipe joint, the tapered surface 24a is engaged. Only the front and rear ends of the inclined surface 15a of the stop member 15 are in partial contact with each other, and are separated from the intermediate portion in the tube axis direction.

  By doing in this way, since the space | gap area | region of the taper surface 24a of the interposed member 24 and the inclined surface 15a of the latching member 15 increases, the impact when external forces, such as an earthquake, act repeatedly before and after a pipe-axis direction The absorption gap can be expanded.

  Further, as shown in FIG. 8, the interposed member 34 as the second modified example of the present invention has a tapered surface 34a formed into a convex curved surface. In the initial state of the pipe joint, the tapered surface 34a is Only a portion of the inclined surface 15a of the locking member 15 other than the end portion in the tube axis direction is in contact, and is separated from the front and rear end portions in the tube axis direction.

  By doing in this way, since the space | gap area | region of the taper surface 34a of the interposition member 34 and the inclined surface 15a of the locking member 15 increases, the impact when external forces, such as an earthquake, act repeatedly before and after a pipe-axis direction The absorption gap can be expanded.

  Note that the inclined surface of the locking member may be formed in a curved surface instead of or in addition to the interposed members 24 and 34 of the first and second modified examples. The inclined surfaces of the locking members that come into contact with the tapered surfaces 24a, 34a of the installation members 24, 34 may be formed as convex or concave curved surfaces that complement each other's surface shape.

  In addition, although not particularly illustrated, the pressing surface of the bolt may be a concave curved surface or a convex curved surface, or instead of the pressing surface of the bolt or in addition to the pressing surface of the bolt, the pressed surface of the interposed member May be formed in a concave curved surface or a convex curved surface. Even with such a configuration, it is possible to secure a gap for absorbing shock when an external force such as an earthquake repeatedly acts back and forth in the tube axis direction between the pressing surface of the bolt and the pressed surface of the interposed member. it can.

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

  Even when an external force is applied to the fluid pipe to be removed or inserted in the pipe axis direction, the interposed member 14 between the locking member 15 and the bolt 13 as the pressing member is placed in the recess 12 of the main body member 11. As the taper surface 14a of the interposed member 14 transitions the contact portion with the outer surface of the locking member 15 as it moves with an allowance of a predetermined width in the axial direction, the fluid axis is removed and inserted. Even when the external force is repeated, the locking member 15, the bolt 13 and the interposed member 14 can disperse each other's contact points without locally colliding with each other. The members 13, 14, 15 can be prevented from being damaged, and as a result, the fluid pipe detachment preventing function can be firmly maintained, and the piping structure at the beginning of connection can be satisfactorily maintained.

  In addition, since the tapered surface 14a of the interposition member 14 and the inclined surface 15a of the locking member 15 are in contact with each other in a substantially parallel state, without receiving external force acting in the tube axis direction, An external force can be received by sliding contact between parallel surfaces inclined with respect to the tube axis direction.

  Further, as the interposition member 14 moves within the recess 12 of the main body member 11 with an allowance of a predetermined width in the tube axis direction, the interposition member 14 is tilted with respect to the bolt 13, thereby Even by the movement, the pressing force can be maintained without the bolts 13, the interposition members 14, and the locking members 15 being separated from each other.

  Further, as shown in FIG. 9, the bolt 13 is provided on the main body member 11 so as to be able to advance and retract in the radial direction of the insertion tube 2. Is not interfered with the outer surface of the insertion tube 2.

  Further, since the interposition member 14 does not contact the rear edge 13b of the pressing surface 13a of the bolt 13, damage to the rear edge 13b can be prevented, and the tilt center of the interposition member 14 and the tilt center of the locking member 15 can be prevented. Can be made different in the tube axis direction, the variation of the tilting modes of the interposing member 14 and the locking member 15 is increased, and the locking member 15 is constantly pressed according to various directions and magnitudes of the external force. can do.

  Furthermore, the pipe joint 1 according to the present invention includes an insertion tube 2 as a fluid tube, a receiving tube 3 into which a front end 2c of the insertion tube 2 is inserted, and a detachment of the insertion tube 2 from the receiving tube 3. And a detachment preventing device 10 for preventing the above. According to such a configuration, since the separation of the insertion tube 2 from the receiving tube 3 can be firmly prevented using the fluid tube separation prevention device 10, a pipe joint having excellent earthquake resistance and stretchability is provided. be able to.

  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 having the recess 12 is described as a push ring fixedly connected to the receiving pipe 3 by the fastening member 4. For example, the main body member is connected to a pipe joint. Reinforcing metal fittings that increase 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 is accommodated in the receiving portion of the receiving tube. A recess may be formed.

  For example, 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 May be covered with a rubber lining or the like, or a buffer material made of rubber or resin may be provided on the tapered surface of the interposed member or the inclined surface of the 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 3 Receptor pipe 4 Fastening member 5 Sealing material 10 Detachment prevention device 11 Main body member 12 Recess 13 Bolt (pressing member)
13a pressing surface 13b rear edge 14 interposing member 14a tapered surface 14b pressed surface 14c rear end surface 15 locking member 15a inclined surface 15c rear end surface 15d fitting groove 16 rear wedge portion 17 front wedge portion 18 auxiliary wedge portion 19 elastic body 24 Interposition member 24a Tapered surface 34 Interposition member 34a Tapered surface

Claims (6)

A main body member that is externally fitted to the outer peripheral surface of the fluid pipe and has a recess facing the outer peripheral surface; a locking member that is tiltably accommodated in the recess and can bite into the outer peripheral surface of the fluid pipe; and the main body A pressing member that is provided on the member and presses the locking member so as to bite into the outer peripheral surface of the fluid pipe, and an interposed member that is interposed between the locking member and the pressing member, A separation prevention device for preventing separation of the fluid pipe in the tube axis direction,
The locking member has a plurality of wedge portions in the front-rear direction of the pipe axis of the fluid pipe, and is configured to tilt in the recess when the fluid pipe moves to the detachment side in the pipe axis direction. And
The interposed member includes a tapered surface that abuts on an outer surface of the locking member, and is accommodated in the recessed portion with a movement allowance of a predetermined width in the tube axis direction of the fluid pipe. A device for preventing separation of fluid pipes.   The fluid pipe detachment preventing device according to claim 1, wherein an outer surface of the locking member is formed as an inclined surface that is in contact with the tapered surface of the interposed member substantially in parallel.   3. The fluid pipe detachment preventing device according to claim 1, wherein the interposed member includes a pressed surface that is tiltably contacted with a pressing surface of the pressing member.   4. The fluid pipe detachment preventing apparatus according to claim 1, wherein the pressing member is provided on the main body member so as to be movable back and forth in a radial direction of the fluid pipe.   The rear edge of the pressing surface of the pressing member, the rear end surface of the interposed member, and the rear end surface of the locking member are arranged in this order from the rear side in the tube axis direction of the fluid pipe. Item 5. The fluid pipe detachment prevention device according to any one of Items 1 to 4.   6. The fluid pipe according to claim 1, 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 prevention device.

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