JP5473495B2 - Sealing material with pipe detachment prevention function and detachment prevention pipe joint - Google Patents

Description

  The present invention relates to a seal material with a tube detachment preventing function having a function of preventing the joined tubes from detaching and a detachment prevention pipe joint including the same.

  Metal pipes such as ductile cast iron pipes that are used as underground water and sewage pipes are constructed by joining a plurality of pipes so that the pipes can move relatively within a certain range. As a result, the entire pipeline can be expanded and contracted against external forces such as earthquakes.

  There are the following methods for joining the tubes together. Preliminarily, an inlet with an expanded inner diameter is provided on one end of the tube, and an insertion port with an unextended outer diameter is provided on the other end. When joining two tubes, insert the inlet of one tube. What is necessary is just to insert in the receptacle of the other pipe | tube.

  In this method, the joined part of the pipe is given a function to prevent detachment so that the joined pipes are not released when they are moved away from each other by external force. Is done.

  As a processing technique for that purpose, as shown in FIG. 5A, an insertion protrusion 65 a is formed on the outer periphery in the vicinity of the distal end of the insertion opening 65, and this insertion protrusion 65 a is fitted into the receiving opening 61. There are a method of engaging with the lock ring 64, a method of attaching a flange tightened with a bolt to the joint, and a method of covering the joint 69 with a block 68 as shown in FIG. 5B. The method requires complicated processing and attachment work, and increases the time and cost.

Japanese Patent Application Laid-Open No. H10-228561 describes a method that can easily process and work as a method for dealing with this problem.
That is, as shown in FIG. 6A, a metal piece 53 is embedded in a sealing material 52 made of an elastic material (a material having high elasticity) disposed in the receiving port 51, and the outer peripheral portion of the sealing material 52 Is inserted into the groove on the inner surface of the receiving port 51, and a claw 54 is provided on the inner peripheral portion of the metal piece 53, so that the tubes in the joined state as shown in FIG. When trying to move, the metal piece 53 rotates around the receiving port inner surface projection 51 a, so that the claw 54 of the metal piece 53 bites into the outer surface of the insertion port 55, and the insertion port 55 is moved from the receiving port 51. It can be prevented from leaving.

  According to this method, by preparing a sealing material 52 in which a metal piece 53 is embedded in advance, the work necessary for preventing separation is the work of disposing the sealing material 52 in the receiving port 51. Therefore, it is possible to reduce the time and cost required for work and processing for preventing separation.

Japanese Patent Laid-Open No. 06-221478

However, the above-mentioned conventional method has a problem that a force (insertion force) required to insert the insertion port 55 into the receiving port 51 is increased at the time of joining the tubes.
That is, when joining the pipes that have been subjected to the separation prevention process using the conventional technique described in Patent Document 1, the sealing material 52 is disposed in the receiving port 51 of one pipe, and then the receiving is performed. The insertion port 55 of the other pipe is inserted into the port 51 as shown in FIG. 6B. At this time, the sealing material 52 made of an elastic material is compressed between the insertion port 55 and the receiving port 51. In order to show a repulsive force with respect to the insertion opening 55 by its own elasticity, it is necessary to compress the sealing material 52 with a force exceeding the repulsive force and insert the insertion opening 55.

  Since the metal piece 53 is embedded in the sealing material 52 made of elastic material as described above, the metal piece 53 will change its posture in the sealing material 52 as the insertion slot 55 is inserted (tilt. ). When the metal piece 53 with high rigidity tries to change the posture in the elastic material with high elasticity, the surrounding elastic material applies an elastic force to the metal piece 53 against the change in the posture. For this reason, when the sealing material 52 in which the metal piece 53 is embedded is used, in addition to the force corresponding to the repulsive force accompanying the compression of the sealing material 52, the pipe is joined to the metal piece 53 in order to join the tubes. A force sufficient to change (tilt) the posture of the metal piece 53 against the elastic force is required, and a larger insertion force is required as compared with the case of using a sealing material composed only of the elastic material.

  Moreover, since the metal piece 53 of the prior art described in Patent Document 1 has a shape that is caught by the groove edge 51a on the front side of the receiving port and the inner surface 51b on the front side of the receiving port as shown in FIG. With this change, strong frictional resistance is received from the groove edge 51a on the front side of the receiving port and the inner surface 51b on the front side of the receiving port. Therefore, a force exceeding the frictional resistance is required for the insertion of the insertion port 55, and this point is also a cause of the need for a large insertion force.

  Since the required insertion force is large, in order to join the tubes adopting such a technology, apart from the joining jig used for joining the tubes using a sealing material composed only of an elastic body, There is a need to prepare a joining jig capable of applying a large insertion force, and there is a problem that the cost required for joining increases.

  In view of the above problems, the present invention provides a sealing material with a pipe detachment preventing function and a detachment preventing pipe joint that are easy to process and work to prevent detachment, have a small insertion force, and facilitate pipe joining. For the purpose.

In order to solve the above-described problems, a sealing material with a tube detachment preventing function according to the present invention includes a pipe having a receiving groove and a lock groove having a rectangular cross section formed on the inner surface of the receiving hole, and the one pipe. A sealing material with a pipe detachment preventing function for a pipe joint composed of the other pipe having an insertion port inserted into the receiving port, and a seal material body made of a compressible elastic material, and a metal lock body The sealing material body is an annular body having a flange portion disposed in the lock groove and a sealing portion extending from the flange portion and disposed on the back side of the receiving port from the lock groove, The lock body is embedded in the seal material main body, and a plurality of lock bodies are arranged at intervals in the circumferential direction of the seal material main body, and the lock body is provided with a claw portion that can bite into the outer surface of the insertion opening. The lock body faces the lock groove edge on the back side of the receiving port. The shape of the axial cross section of the portion has a linear shape, the shape of the axial cross-section of a portion facing the bottom surface side and the locking groove of the receiving opening side of the lock groove of the lock body, the spigot into the socket It is characterized in that it has an arcuate shape that can be contacted by point contact with both the side surface of the lock groove on the receiving opening side and the bottom surface of the lock groove at the time of insertion .

With such a configuration, when the insertion port is inserted into the receiving port provided with the sealing material, the contact between the embedded lock body and the receiving groove back side of the lock groove edge becomes a point contact .

Further, with such a configuration, when the insertion port is inserted into the receiving port provided with the sealing material, the contact between the embedded lock body and the side surface and the bottom surface of the lock groove becomes a point contact.
Further, the lock body is arranged so that a gap is formed between a surface on the back side of the receiving port of the lock body and a lock groove edge on the back side of the receiving port in a state where the seal material body is not compressed. It is characterized by.

With such a configuration, when the insertion port is inserted into the receiving port provided with the sealing material, the lock body and the back side of the receiving end of the lock groove edge do not come into contact with the insertion at the same time as the insertion.
Further, the lock body is arranged so that a gap is generated between the surface on the back side of the receiving port of the lock body and the edge of the lock groove on the back side of the receiving port even when the seal material body is compressed. Features.

  With such a configuration, when the insertion port is inserted into the receiving port provided with the sealing material, the lock body and the lock groove edge directly behind the receiving port even if the insertion of the insertion port proceeds to some extent. And no contact.

Further, the sealing material main body can be arranged such that a gap is formed between the seal groove body and the lock groove edge on the back side of the receiving port in an uncompressed state.
With such a configuration, when the insertion port is inserted into the receiving port provided with the sealing material, the sealing material and the receiving groove back side of the lock groove edge do not come into contact simultaneously with the insertion.

  In addition, when the seal body of the lock body is in an uncompressed state, a gap is generated between the surface on the back side of the lock body of the lock body and the portion on the back side of the lock body of the seal material body. It is arranged so that it may be arranged.

With such a configuration, when the insertion port is inserted into the receiving port provided with the seal material, the lock body does not receive a repulsive force from the seal material body simultaneously with the insertion.
In addition, a detachment prevention pipe joint according to the present invention includes the above-described sealing material with a detachment prevention function.

  When the insertion port is inserted into the receiving port provided with the sealing material according to the present invention, the contact between the lock body and the lock groove edge becomes a point contact, so the frictional resistance that the lock body receives from the lock groove edge is reduced. Therefore, the lock body can be easily tilted, and the insertion force necessary for joining the tubes is reduced.

  Moreover, since the lock body and the seal material main body do not contact the receiving groove back side of the lock groove edge at the same time as the insertion of the insertion port, the repulsive force of the seal material main body against the insertion of the insertion port can be reduced. The insertion force required for joining is reduced.

  In addition, by preventing the lock body and the receiving groove back side of the lock groove edge from coming into direct contact, the lock body does not receive frictional resistance from the lock groove edge when the posture is changed. The insertion force required for joining is reduced.

  Therefore, the use of the sealing material with the tube detachment preventing function and the detachment preventing pipe joint according to the present invention facilitates the processing and work for preventing the detachment, further reduces the insertion force, and facilitates the pipe joining.

Sectional drawing which shows the pipe socket which arrange | positioned the sealing material of embodiment of this invention (A) is sectional drawing which shows a state in which a sealing material main body is an uncompressed state in the receiving port which arrange | positioned the sealing material which concerns on this invention, (b) is an insertion port inserted in the receiving port, and the front-end | tip of an insertion port becomes a sealing material Sectional drawing which shows the state which contact | abutted, (c) is sectional drawing which shows the state by which the insertion opening was inserted in the receptacle, and the sealing material main body was compressed (A) is a front view which shows the external appearance of the sealing material of embodiment which concerns on this invention, (b) is a perspective view which shows the external appearance of a part of the sealing material. (A) is sectional drawing which shows the receiving port by which the sealing material was arrange | positioned in another example of embodiment of this invention, (b) is the state in which the front-end | tip of the insertion port contacted the sealing material in another example of embodiment. (C) is a cross-sectional view showing a receiving port in which a sealing material is arranged in still another example of the embodiment of the present invention, and (d) is an insertion tip in yet another example of the embodiment. Sectional drawing which shows the state contact | abutted to the sealing material (A) is a state of pipe joining using a lock ring in the prior art, and (b) is a state of pipe joining using a block in the prior art. (A) is sectional drawing which shows the mode of the sealing material in a prior art, (b) is sectional drawing which shows a mode when the sealing material begins to be compressed by an insertion port, (c) is the sealing material arrange | positioned Sectional drawing which shows the state by which the insertion port was inserted in the receiving port, and the sealing material main body was compressed

  FIG. 1 shows a state in which the sealing material 10 according to the embodiment of the present invention is disposed in the tube receiving port 43, and FIG. 3A shows a front view of the sealing material 10 according to the embodiment of the present invention. FIG. 3B shows a perspective view of a part of the sealing material 10 according to the embodiment of the present invention.

  In FIG. 1, a lock groove 44 having a rectangular cross section having a larger inner diameter than the tube end edge 43 a is formed on the inner surface on the back side of the tube end edge 43 a of the receiving port 43. It has a surface 46 on the front side of the receiving port, a lock groove bottom surface 47, and a lock groove edge 45 on the back side of the receiving port. The inner diameter of the lock groove edge 45 on the back side of the receiving port is smaller than the inner diameter of the lock groove bottom surface 47 and larger than the inner diameter of the tube end edge 43a. Further, the lock groove edge 45 has a cross-sectional contour that is convex downward in the drawing.

  As shown in FIGS. 3A and 3B, the sealing material 10 includes a sealing material body 11 and a lock body 12, and the sealing material body 11 is made of a compressible elastic material (such as rubber). ), A relatively hard flange 11a formed in a shape that can be fitted into a lock groove 44 formed on the inner surface of the tube receiving opening 43, and the receiving opening 43 extending from the flange 11a. It has a relatively soft sealing portion 11b extending to the back side. The flange portion 11a and the sealing portion 11b may have the same hardness.

  The lock body 12 is made of a hard material such as metal, for example. As shown in FIG. 3A, a plurality of lock bodies 12 are spaced apart in the circumferential direction of the seal material main body 11 (eight in the figure). May be increased or decreased depending on the size and nature of the target tube) and are embedded in the sealant body 11. In FIG. 3 (b), only one lock body 12 is shown, and only the state of the surrounding sealing material 10 is shown by a solid line, but actually the remaining sealing material shown by a broken line is shown. The lock body 12 is also arranged at the portion 10.

  The lock body 12 is provided with a claw portion 13 at a portion located on the inner peripheral side of the seal material main body 11. The claw portion 13 protrudes toward the inner peripheral side of the seal material main body 11 and is arranged so as to mesh with the outer surface of the insertion port when the insertion port of another tube is inserted into the receiving port 43. Yes.

  Here, the surface 14 of the lock body 12 on the side facing the lock groove edge 45 on the back side of the receiving opening 43 has an axial cross section (cross section by a plane parallel to the tube axis) as shown in FIG. It is formed to be linear.

  Further, a portion (top portion) 15 of the lock body 12 that faces the front surface 46 of the lock groove 44 is formed so that its axial cross-sectional shape is an arc as shown in FIG. Yes.

  Further, as shown in FIG. 1, the lock body 12 has a surface 14 on the side facing the lock groove edge 45 on the back side of the receiving port 43 in a state where the seal body 11 is not compressed (the insertion port is connected to the receiving port 43. In a state in which the gap is not inserted, the gap d1 is disposed between the lock groove edge 45 on the back side of the receiving opening 43.

FIG. 2 shows a state in which the insertion opening 42 of another pipe is inserted into the receiving opening 43 of the pipe in which the sealing material 10 configured as shown in FIG. 1 is disposed.
As shown in FIG. 2A, the seal material body 11 is in an uncompressed state when the distal end 42a of the insertion opening 42 enters the receiving opening 43, but when the insertion is further advanced from there, the taper becomes tapered. The surface of the insertion tip 42a formed in the shape touches the sealing material main body 11, and thereafter, as the insertion of the insertion port 42 is advanced, the sealing material main body 11 rides on the surface of the tapered insertion tip 42a. Since the insertion tip 42a is formed in a taper shape, as the insertion proceeds, the outer diameter of the insertion tip 42a at the portion where the seal material body 11 is touched increases, and between the inner surface of the receiving port 43 The sealing material body 11 is compressed.

  When the insertion port 42 is inserted into the receiving port 43 and the sealing material main body 11 is compressed, the lock body 12 embedded in the sealing material main body 11 is made of a hard material. 11 cannot be deformed by being compressed. Therefore, the lock body 12 is pushed by the tip 42a of the insertion opening 42 to change its posture (tilt and rotation).

  Here, as shown in FIG. 1 and FIG. 2 (a), when a gap d1 is provided between the lock body 12 and the lock groove edge 45 on the back side of the receiving port 43, it is shown in FIG. 2 (b). Thus, the lock body 12 rotates in the direction filling the gap d1, that is, in the direction of the arrow in the figure, and the lock body 12 does not contact the lock groove edge 45 on the back side of the receiving opening 43 until the insertion opening 42 is inserted to some extent. Without contact, friction resistance from the lock groove edge 45 on the back side of the receiving port 43 is not received until contact is made. For this reason, the insertion opening 42 can be inserted with a small insertion force until the lock body 12 contacts the lock groove edge 45 on the back side of the receiving opening 43.

  And after the lock body 12 contacts the lock groove edge 45 on the back side of the receiving port 43, the movement of the lock body 12 is regulated by the shape of the inner surface of the receiving port 43. Since the cross-sectional shape of the surface 14 on the side facing the lock groove edge 45 is formed to be a straight line shape, when it is pushed by the tip 42a of the insertion opening 42 and touches the lock groove edge 45 on the back side of the receiving opening 43 The contact is point contact.

  Since the contact with the lock groove edge 45 on the back side of the receiving port 43 is a point contact, the posture of the lock body 12 is pushed further from there around the lock groove edge 45 on the back side of the receiving port 43 (FIG. 2B). ) When changing by rotating (in the direction of the middle arrow), the frictional resistance from the lock groove edge 45 on the back side of the receiving port 43 is received only from one point of contact, so it is smooth without being blocked by this friction. You can change your posture. For this reason, as shown in FIG. 6C, the insertion opening 42 is inserted into the receiving opening 43 with a smaller insertion force than a conventional sealing material having a metal piece 53 shaped to be caught on the inner surface of the receiving opening 51. Can be made.

  Further, as shown in FIGS. 2B and 2C, the shape of the axial section of the top portion 15 of the lock body 12 is an arc shape, so that the lock groove 44 on the near side of the receiving port is located. The contact with the surface 46 and the lock groove bottom surface 47 is a point contact.

  Since the contact with the front surface 46 of the lock groove 44 is a point contact, the lock body 12 is further pushed from there and the posture of the lock body 12 is around the lock groove edge 45 on the back side of the reception port 43 (FIG. 2 ( b) When rotating and changing (in the direction of the middle arrow), the frictional resistance from the front surface 46 of the lock groove 44 is received only from the point of contact, and the lock body 12 is locked to the lock groove 44. The posture can be smoothly changed without being caught by the surface 46 on the front side. For this reason, the insertion opening 42 can be inserted into the receiving opening 43 with a smaller insertion force than the conventional sealing material having an angular shape as shown in FIG.

  When the sealing member main body 11 is compressed in this way and the posture of the lock body 12 is changed and the insertion port 42 is inserted into the receiving port 43 by a predetermined amount, the repulsive force of the sealing material main body 11 causes the lock body 12 to move. Upon receiving a force in a direction to return the sealing material main body 11 to the non-compressed posture, the claw portion 13 of the lock body 12 is engaged with the surface of the insertion opening 42 as shown in FIG.

  And when the force of the direction (extraction direction) which keeps the insertion port 42 away from the receiving port 43 in the state which the nail | claw part 13 of the lock body 12 meshed | engaged with the surface of the insertion port 42 like FIG.2 (c), A force in the extraction direction is also applied to the lock body 12 via the claw portion 13 meshing with the surface of the insertion opening 42, but the top portion 15 of the lock body 12 is extracted from the front surface 46 of the lock groove 44. Since the lock body 12 cannot move in the exit direction, the lock body 12 rotates in the clockwise direction in FIG. 2C so as to move the portion on the claw portion 13 side with the top portion 15 as the center. Become.

  In FIG. 2C, when the lock body 12 rotates clockwise around the top portion 15, the claw portion 13 is more likely to bite into the surface of the insertion opening 42. This biting is a great resistance against the force that tries to keep the insertion opening 42 away from the receiving opening 43, so that the tube is prevented from being detached.

  As another example of the embodiment of the present invention, as shown in FIG. 4 (a), not only the lock body 12 but also the sealing material body 11 itself is in a non-compressed state. The sealing material main body 11 may be formed and arranged so that a gap d2 is left between the groove edge 45 and the groove edge 45.

  As in the embodiment shown in FIG. 4A, if there is a gap d <b> 2 between the seal material main body 11 and the lock groove edge 45 on the back side of the receiving port 43, the insertion port 42 is inserted into the receiving port 43. At this time, as shown in FIG. 4B, the seal material main body 11 pushed by the insertion opening 42 first moves in the direction of closing the gap d2 (the direction of the arrow in FIG. 4B), and the insertion opening 42 is inserted. Is not compressed until it is inserted to some extent, the sealing material body 11 does not apply a repulsive force to the insertion port 42 during that time, and the insertion port 42 is inserted with a small insertion force until the sealing material body 11 starts to be compressed. can do.

That is, by providing the gap d2 between the seal material main body 11 and the lock groove edge 45 on the back side of the receiving port 43, the insertion force at the time of pipe joining can be reduced.
As still another example of the embodiment of the present invention, as shown in FIG. 4C, when the seal body 11 is in an uncompressed state, the surface of the lock body 12 on the back side of the receiving port 43 and the seal body. The lock body 12 may be arranged so that a gap d3 is formed between the 11 lock bodies 12 and the portion located on the back side of the receiving opening 43.

  As in the embodiment shown in FIG. 4C, if there is a gap d3 between the lock body 12 and the seal material main body 11, when the insertion port 42 is inserted into the receiving port 43, the insertion port 42 is pushed. As shown in FIG. 4 (d), the lock body 12 is moved in the direction of closing the gap d3 (in the direction of the arrow in FIG. 4 (d)), so that the lock body 12 contacts the seal material body 11. Until then, the lock body 12 does not receive a repulsive force from the seal material body 11. For this reason, the insertion opening 42 can be inserted with a small insertion force until the lock body 12 contacts the seal material main body 11.

That is, by providing the gap d3 between the lock body 12 and the seal material main body 11, the insertion force at the time of pipe joining can be reduced.
As described above, when the sealing material with the tube detachment preventing function according to the present invention is used, the insertion force required when joining the tubes is small, and it is easy without preparing a jig for applying a large insertion force. Therefore, it is possible to reduce the cost required for the bonding. Further, since the separation preventing function can be obtained simply by disposing the sealing material in the receiving port, it is possible to reduce the time and cost required for the work and processing for preventing the separation.

  In addition, the configuration of the pipe joint is a simple configuration with a small number of parts, in which the sealing material is disposed in the groove on the inner surface of the receiving port.

DESCRIPTION OF SYMBOLS 10 Sealing material 11 Sealing material main body 12 Locking body 13 Claw part 42 Insertion 43 Receiving port

Claims (6)

A pipe joint comprising: a pipe having a receiving groove and a lock groove having a rectangular cross section formed on the inner surface of the receiving opening; and the other pipe having an insertion opening inserted into the receiving opening of the one pipe. A sealing material with a tube detachment preventing function for
It consists of a sealant body made of compressible elastic material and a metal lock body,
The seal material body is an annular body having a flange portion disposed in the lock groove and a sealing portion extending from the flange portion and disposed on the back side of the receiving port from the lock groove,
The lock body is embedded in the seal material body, and a plurality of the lock bodies are arranged at intervals in the circumferential direction of the seal material body,
The lock body is provided with a claw portion that can bite into the outer surface of the insertion opening,
The shape of the cross section in the axial direction of the portion facing the lock groove edge on the back side of the receiving port of the lock body is linear ,
The shape of the axial cross section of the side facing the bottom surface of the lock groove and the bottom surface of the lock groove of the lock groove of the lock body is the side surface of the lock groove on the mouth opening side when the insertion hole is inserted. A seal material with a tube detachment preventing function, characterized in that it has an arc shape that can be contacted by point contact with both surfaces of the lock groove . In the pipe joint which consists of one pipe | tube which has a lock slot formed in the inner surface of the receptacle and the said receptacle, and the other pipe | tube which has an insertion port inserted in the receptacle of said one pipe | tube, the inside of the said receptacle A sealing material with a tube detachment preventing function that is compressed between the peripheral surface and the outer peripheral surface of the insertion opening,
It consists of a sealant body made of compressible elastic material and a metal lock body,
The seal material body is an annular body having a flange portion disposed in the lock groove and a sealing portion extending from the flange portion and disposed on the back side of the receiving port from the lock groove,
The lock body is embedded in the seal material body, and a plurality of the lock bodies are arranged at intervals in the circumferential direction of the seal material body,
The lock body is provided with a claw portion that can bite into the outer surface of the insertion opening,
The lock body is disposed so that a gap is formed between a surface on the back side of the receiving port of the lock body and a lock groove edge on the back side of the receiving port in a state where the seal material main body is not compressed. The sealing material with a tube detachment preventing function according to claim 1 . The lock body is arranged so that a gap is formed between a surface on the back side of the receiving port of the lock body and a lock groove edge on the back side of the receiving port even when the seal material body is compressed. The sealing material with a pipe detachment preventing function according to claim 2 . Sealing material body, in an uncompressed state, the tube withdrawal of any of claims 2 or claim 3, wherein the positionable so that a gap is formed between the socket inner side of the lock groove edge Sealing material with prevention function. When the lock body is in a state in which the seal material body is not compressed, a gap is formed between a surface on the back side of the lock body of the lock body and a portion on the back side of the lock body in the seal material body. The sealing material with a pipe detachment preventing function according to any one of claims 2 to 4 , wherein the sealing material is disposed. A detachment prevention pipe joint comprising the sealing material with a pipe detachment prevention function according to any one of claims 1 to 5 .

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