JP2015172381A - Device for preventing removal of fluid pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for preventing removal of a fluid pipe in which a lock member is stably housed without dropping from a recessed part and the lock member exerts a locking force as designed after being assembled.SOLUTION: A removal prevention device 10 includes: a body member 11 which fits on an outer peripheral surface 2b of a fluid pipe 2 and has a recessed part 12 facing the outer peripheral surface 2b; a lock member 15 which is tiltably housed in the recessed part 12 and digs into the outer peripheral surface 2b of the fluid pipe 2; and pressing parts 13, 14 which are provided at the body member 11 and press the lock member 15. The removal prevention device 10 prevents removal of the fluid pipe 2 in a pipe axis direction. A fitting groove 15d, in which an elastic body 19 for preventing the lock member 15 from dropping from the recessed part 12 fits, is formed in an end part of the lock member 15 when viewed in a circumferential direction of the fluid pipe 2 so as to narrow in an outer diameter direction of the fluid pipe 2.

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 detachment prevention devices and pipe joints, a stopper (locking member) having a plurality of wedge portions in a recess of a push ring (main body member) externally fitted to the outer peripheral surface of the insertion pipe (fluid pipe), A contact member that is housed via a holder (elastic body) and that has a push bolt (pressing member) on the main body member, and an external force caused by an earthquake or the like occurs in a direction that causes the fluid pipe to be detached in the pipe axis direction. By pressing the locking member against the outer peripheral surface of the fluid pipe via the (intervening member), the wedge part is bitten into the fluid pipe to prevent the fluid pipe from coming off in the pipe axis direction (for example, Patent Documents) 1).

Japanese Utility Model Publication No.4-1434 (page 3, FIG. 6)

  However, in Patent Document 1, the stopper (locking member) is housed in the recess in a state where it is urged at only one point in the circumferential direction of the fluid pipe by the holder (elastic body). The stopper (locking member) in the recess in the initial stage of assembly is likely to be unstable, and the lock member and the interposition member may fall out of the recess when the detachment prevention device is assembled to the insertion tube (fluid tube). There is a problem that arises.

  In addition, in order to prevent the locking member or the interposition member from falling off from the recess, when the elastic force is increased by changing the material or shape of the elastic body, the elastic body still remains to the locking member after assembly. In order to give a high elastic force, when an external force due to an earthquake or the like is generated in a direction in which the fluid pipe is detached, there is a problem that the locking member may not be tilted to a predetermined level and the designed locking force may not be exhibited.

  The present invention has been made paying attention to such problems, and the locking member can be stably accommodated without falling out of the recess, and the locking member after assembly has a locking force as designed. It is an object of the present invention to provide a fluid pipe detachment prevention device that can be exerted.

In order to solve the above problems, the fluid pipe detachment preventing device of the present invention is
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 detachment preventing device that is provided on the member and includes a pressing portion that presses the locking member, and prevents detachment of the fluid pipe in the tube axis direction;
A fitting groove for fitting an elastic body for preventing the locking member from falling off from the recess is narrowed toward an outer diameter direction of the fluid pipe at an end of the locking member in the circumferential direction of the fluid pipe. It is characterized by being formed.
According to this feature, since the elastic restoring force of the elastic body fitted in the fitting groove formed narrow in the outer diameter direction of the fluid pipe acts more strongly on the outer diameter side, the locking member is recessed. Not only can it be securely stored without dropping from the inside, but also when the locking member accommodated in the recess moves or tilts, the elastic body fitted in the fitting groove follows the movement of the locking member, The body can be moved or tilted as designed without affecting the movement or tilting of the locking member without the body being detached in the recess.

The fluid pipe detachment prevention device of the present invention comprises:
The fitting groove is formed between a plurality of wedge portions provided in the locking member.
According to this feature, since the fitting groove can be formed by effectively using the space between the plurality of wedge portions without eroding the regions of the wedge portions, the locking ability of the locking member is not affected. .

The fluid pipe detachment prevention device of the present invention comprises:
The fitting groove of the locking member is formed so as to penetrate in the radial direction of the fluid pipe.
According to this feature, the elastic body elastically deformed in the penetration direction of the fitting groove comes into contact with the inner wall of the recess or the outer surface of the fluid pipe, so that the elastic body can function as a buffer material.

The fluid pipe detachment prevention device of the present invention comprises:
The pressing portion includes a pressing member provided on the main body member, and an interposed member interposed between the locking member and the pressing member, and the interposed member is an outer surface of the locking member. It is characterized by having a taper surface which contacts.
According to this feature, the interposition member can be held between the pressing member and the engaging member biased inward of the recess, and further fitted into the fitting groove narrow in the outer diameter direction. By using the elastic body, the elastic restoring force acting in the outer diameter direction can be biased toward a predetermined position in the tube axis direction by converting the elastic restoring force in the tube axis direction using the tapered surface of the interposed member. .

The fluid pipe detachment prevention device of the present invention comprises:
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). It is a sectional side view of a detachment prevention device. It is a side view which shows the state by which the elastic body was fitted by the fitting groove of the locking member. It is a figure which shows the state which the elastic restoring force of an elastic body acts on a locking member and an interposed member.

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

  A separation preventing apparatus according to an embodiment will be described with reference to FIGS. 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 of ductile cast iron for waterworks 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 interposed member 14. As shown in 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. 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. Further, as shown in FIG. 2A, a stepped portion with which an elastic body 19 described later is engaged is provided on the peripheral side wall 12d. Note that the stepped portion may not be provided.

  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. Further, 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, and the inclined surface 15a is directed to the front side in the tube axis direction of the insertion tube 2 in the insertion tube 2. The diameter is increased and tilted away from the outer surface.

  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. A front wedge portion 17 is formed on the front side in the tube axis direction where the diameter dimension of the inclined surface 15a of the locking member 15 is relatively large, and on the rear side in the tube axis direction where the diameter dimension of the inclined surface 15a is relatively small, A rear wedge portion 16 is formed, and an auxiliary wedge portion 18 is formed between the front wedge portion 17 and the rear wedge portion 16 in the tube axis direction.

  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. 3A and 3B, the inner diameter dimension and the circumferential dimension at the tip of each wedge portion 16, 17, 18 are determined when the locking member 15 is pressed by the bolt 13, or When the stop member 15 is tilted as will be described later, the dimension is set so as to bite into the insertion tube 2 over the entire length in the circumferential direction of each wedge portion 16, 17, 18. 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 amount of protrusion of the auxiliary wedge portion 18 in the inner diameter direction is set smaller than the amount of protrusion of the front wedge portion 17 and the rear wedge portion 16 in the inner diameter direction, and more specifically, the amount of protrusion of the auxiliary wedge portion 18 in the inner diameter direction. Is set at a position of a predetermined dimension δ radially outward from the line connecting the tips of the front wedge portion 17 and the rear wedge portion 16.

  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 or tilted along the tapered surface 14 a of the interposed member 14.

  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. Here, the interposition member 14 accommodated in the bottom accommodating portion 12e is restricted in movement in the circumferential direction, and is formed in a size that does not deviate from the bottom accommodating portion 12e during the pressing action of the engaging member 15. 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, an aspect of fitting of the locking member constituting the separation preventing device of the present invention into the recess will be described.

  As shown in FIGS. 3 (a) and 3 (b), the locking member 15 is formed in a substantially bow shape having arcuate wedge portions 16, 17, 18 along the outer peripheral surface of the insertion tube 2. The engaging members 15 are provided with fitting grooves 15d and 15d at both ends in the circumferential direction. As shown in FIGS. 2A and 2B, the locking member 15 is accommodated in the recess 12 of the main body member 11 by fitting an elastic body 19 having elasticity in each fitting groove 15d. Yes. Therefore, the locking member 15 is held in the concave portion 12 by the elastic restoring force of the elastic body 19 that is sandwiched between the fitting groove 15d and the peripheral side wall 12d of the concave portion 12 and elastically contracted, and is prevented from falling off the concave portion 12. ing.

  As shown in FIG. 5, the elastic body 19 is made of an elastic material such as natural rubber such as SBR, CR, and NBR, synthetic rubber, or resin, and in its natural state, the tip is a hemispherical surface at the rear end. It has a substantially bullet shape that gradually becomes larger in diameter, and is slightly larger than the inside of the fitting groove 15d.

  The fitting groove 15d is formed between the front wedge part 17 and the rear wedge part 16, penetrates inward and outward in the radial direction of the locking member 15, and groove wall parts 15e and 15e constituting the fitting groove 15d. However, they face each other so as to gradually narrow in a taper shape at a predetermined taper angle α toward the outer diameter direction.

  Next, the fitting of the elastic body 19 into the fitting groove 15d will be described. As shown in FIG. 5, the tip of the elastic body 19 is gradually inserted from the inner diameter side to the outer diameter side of the fitting groove 15d. Since the distal end side of the elastic body 19 has a relatively small diameter and the inner diameter side of the fitting groove 15d has a relatively large diameter, the outer surface of the elastic body 19 is inserted into the fitting groove 15d in the middle of insertion of the elastic body 19. It is possible to avoid elastic deformation of the elastic body 19 due to strain without sliding contact with the groove wall portions 15e and 15e.

  The elastic body 19 that has been fitted into the fitting groove 15d is pinched between the opposed groove wall portions 15e and 15e, and the front end portion and the rear end portion of the elastic body 19 are slightly elastically deformed and bulge out. 5, the elastic restoring force D of the elastic body 19 acts in a direction orthogonal to the tapered surfaces of the groove wall portions 15e and 15e, as indicated by the dotted line enclosing portion in FIG.

  More specifically, the elastic restoring force D of the elastic body 19 in the fitting groove 15d is divided into a component force D1 facing the outer diameter side in the tube axis orthogonal direction and a component force in the tube axis direction. Due to the component force D1 in the direction perpendicular to the tube axis, the locking member 15 constituting the groove wall portions 15e, 15e is urged toward the outer diameter side in the direction perpendicular to the tube axis, in other words, toward the inside of the recess 12.

  Further, as shown in FIGS. 5 and 6, the locking member 15 on which the component force D <b> 1 acts on the outer diameter side in the direction perpendicular to the tube axis is an interposed member that faces the inclined surface 15 a of the locking member 15 substantially in parallel. 14 taper surfaces 14a are pressed. Therefore, as shown in FIG. 6, the component force D1 acting on the locking member 15 is further divided into a component force D2 that faces the front side in the tube axis direction and a component force that is orthogonal to the inclined surface 15a. That is, the locking member 15 is urged forward in the tube axis direction within the recess 12 by the component force D2.

  On the other hand, as shown in FIG. 6, a reaction force D1 'having the same magnitude acts on the interposed member 14 having the tapered surface 14a in the direction opposite to the component force D1. The reaction force D1 'acting on the interposed member 14 is further divided into a component force D2' that faces the rear side in the tube axis direction and a component force that is orthogonal to the tapered surface 14a. That is, the interposed member 14 is urged to the rear side in the tube axis direction in the recess 12 by the component force D2 '.

  That is, according to such a configuration of the fitting groove 15d, the locking member 15 fits the elastic body 19 into the fitting groove 15d provided with the groove wall portions 15e and 15e gradually narrowing in the outer diameter direction. As a result, the elastic restoring force gradually increases toward the outer diameter direction, and presses the groove wall portions 15e and 15e toward the outer diameter direction. As a result, the locking member 15 is biased in the outer diameter direction in the recess 12 by the elastic restoring force of the elastic body 19. As in this embodiment, the bolt 13 provided on the main body member 11 is screwed and the locking member 15 is bitten into the outer peripheral surface 2b of the insertion tube 2 through the interposed member 14, When the locking member 15 is not in contact with the front side wall in the initial state, the moving distance of the wedge action is reduced and the separation preventing force is reduced, or in the initial state, the interposed member 14 is the rear side wall. If the contact member 14 is not in contact with the locking member 15, the interposition member 14 may move rearward during the wedge action, and the detachment prevention force may be reduced. However, due to the elastic restoring force of the elastic body 19, These states can be prevented.

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

  Since the elastic restoring force of the elastic body 19 fitted in the fitting groove 15d formed narrow in the outer diameter direction of the insertion tube 2 acts more strongly on the outer diameter side, the locking member 15 is recessed 12. The elastic body 19 fitted in the fitting groove 15d is moved by the engagement member 15 when the engagement member 15 accommodated in the recess 12 is moved or tilted. Accordingly, the elastic member 19 does not fit in the recess 12 and does not affect the movement or tilting of the locking member 15, and the locking member 15 can move or tilt as designed.

  Further, the fitting groove 15d is formed between the plurality of wedge portions 16 and 17 provided in the locking member 15, so that these regions do not erode the areas of the plurality of wedge portions 16 and 17. Since the fitting groove 15d can be formed by effectively using the space between them, the locking ability of the locking member 15 is not affected.

  Further, the elastic body 19 elastically deformed in the penetration direction of the fitting groove 15d comes into contact with the inner wall of the recess 12 or the outer peripheral surface 2b of the insertion tube 2 so that the elastic body 19 can function as a buffer material. .

  Further, the interposition member 14 can be held between the bolt 13 and the engagement member 15 biased inward of the recess 12, and further fitted into the fitting groove 15d narrow in the outer diameter direction. By changing the elastic restoring force acting in the outer diameter direction to the tube axis direction by using the tapered surface 14a of the interposed member 14, the interposed member 14 is brought to a predetermined position in the tube axis direction. Can be energized.

  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 portion 3 Receptacle tube 4 Fastening member 5 Sealing material 10 Detachment prevention device 11 Main body member 12 Recess 13 Bolt (pressing portion)
13a Pressing surface 14 Interposing member (pressing part)
14a Tapered surface 14b Pressed surface 15 Locking member 15a Inclined surface 15d Fitting groove 15e Groove wall portion 16 Rear wedge portion 17 Front wedge portion 19 Elastic body

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 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. has become a triangle consisting of a surface extending in the tube radially outwardly of the mouth tube 2 (outer radial direction), each wedge unit 16, 17, 18, the tube axis toward the outer circumferential surface of the inserted pipe 2 from its proximal end It has a tapered shape that slopes forward in the direction.

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. 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

Claims (5)

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 detachment preventing device that is provided on the member and includes a pressing portion that presses the locking member, and prevents detachment of the fluid pipe in the tube axis direction;
A fitting groove for fitting an elastic body for preventing the locking member from falling off from the recess is narrowed toward an outer diameter direction of the fluid pipe at an end of the locking member in the circumferential direction of the fluid pipe. A fluid pipe detachment prevention device characterized in that the fluid pipe is formed.   The fluid pipe detachment preventing device according to claim 1, wherein the fitting groove is formed between a plurality of wedge portions provided in the locking member.   The fluid pipe detachment preventing device according to claim 1 or 2, wherein the fitting groove of the locking member is formed so as to penetrate in a radial direction of the fluid pipe.   The pressing portion includes a pressing member provided on the main body member, and an interposed member interposed between the locking member and the pressing member, and the interposed member is an outer surface of the locking member. 4. The fluid pipe detachment preventing device according to claim 1, further comprising a tapered surface that abuts against the fluid pipe.   The fluid pipe according to any one of claims 1 to 4, wherein the fluid pipe, a receiving pipe into which a front end portion of the fluid pipe is inserted, and the fluid pipe are prevented from being detached from the receiving pipe. A pipe joint comprising the prevention device.

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