JP6607775B2 - Piping connection structure - Google Patents

Description

  The present invention relates to a pipe connection structure.

  Conventionally, in a piping system of an exhaust purification system in a large transport vehicle, a quick connector that can be quickly connected with one touch is widely used when a resin tube is connected to a metal counterpart pipe, etc. Yes.

  3 and 4 show an example of a conventional pipe connection structure using a quick connector, in which 1 is a resin tube, 2 is a metal mating pipe to which the tube 1 is connected, and 3 are these A quick connector for connecting the tube 1 and the mating pipe 2 with one touch is shown. The quick connector 3 is mounted on the connector main body 4 mounted on the tip of the tube 1 and the tip of the mating pipe 2. The connector main body 4 is formed with a cylindrical insertion portion 6 for inserting the mating pipe 2 into an inner insertion space, and a diameter smaller than that of the insertion portion 6. A nipple portion 7 that is press-fitted inside is provided.

  Here, at a plurality of axial positions on the outer peripheral surface of the nipple portion 7, biting teeth 8 having a serrated tip with an acute angle are formed in an annular shape, and the nipple portion 7 is attached to the tube 1. When the press-fitting is performed, the biting teeth 8 bite into the inner peripheral surface of the tube 1 so as to function as a retainer.

  An annular holding groove 9 is formed on the outer peripheral surface of the tip portion of the nipple portion 7. An elastic O-ring 10 as a seal ring is held in the holding groove 9, and the nipple portion is held by the O-ring 10. 7 and the tube 1 are sealed in a liquid-tight manner.

  On the other hand, an elastic O-ring 11 and a bush 12 as a seal ring are held on the inner peripheral surface of the insertion portion 6, and the O-ring 11 is disposed on the outer peripheral surface of the mating pipe 2 inserted into the insertion space. Is fitted to seal between the mating pipe 2 and the insertion portion 6 in a liquid-tight manner.

  In addition, a retainer holding portion 13 having a socket shape is provided on the end of the insertion portion 6 on the side where the mating pipe 2 is received, and the retainer 5 mounted on the mating pipe 2 side is provided with the retainer holding portion 13. The mating pipe 2 and the connector main body 4 are connected to each other by being housed and locked.

  Here, the retainer 5 is attached to the mating pipe 2 by placing the retainer 5 on the distal end side of the mating pipe 2 and pushing it into the bulge portion 14 bulging in an annular shape on the outer peripheral surface of the mating pipe 2. The retainer 5 is locked.

  That is, the retainer 5 is slidably fitted to the mating pipe 2 and is dammed by the bulge part 14, and the axial direction from the position facing the diameter direction of the tip annular part 15. And a pair of wings 16 that are elastically deformed so as to extend close to and away from each other. The wings 16 are locked to the bulge part 14 from the side opposite to the tip annular part 15. A locking claw 17 is formed to obtain.

  A tapered inner peripheral surface that gradually increases in diameter toward the end of the wing portion 16 is formed on the inner peripheral side of the locking claw 17, and the retainer 5 is connected to the end of the mating pipe 2. When the cover is pushed in, the locking claw 17 easily gets over the bulge part 14.

  Further, on the outer peripheral side of the locking claw 17, the pair of window portions 18 opened in the retainer holding portion 13 of the connector main body 4 enter from the inside so as to be locked to the edge of the window portion 18. A stopper 19 having a serrated cross section is formed.

  That is, on the outer peripheral side of the locking claw 17, a tapered outer peripheral surface that gradually increases in diameter toward the end of the wing portion 16 is formed, and the mating pipe 2 to which the retainer 5 is attached is connected to the connector main body. When the retainer claw 17 is inserted into the retainer holding portion 13, the retaining claw 17 can easily pass through the entrance end of the retainer holding portion 13.

  Thus, when the quick connector 3 is used, when the retainer 5 is pushed in from the distal end side of the mating pipe 2, each wing portion 16 of the retainer 5 is pushed and expanded by the bulge portion 14 so that the locking claws 17 are formed. Over the bulge part 14 and over the bulge part 14, the locking claw 17 is locked to the bulge part 14 by returning the wing parts 16 to the original state, and the bulge part 14 On the other hand, the end annular portion 15 of the retainer 5 is also abutted and locked, and the retainer 5 is attached to the mating pipe 2 in a state where movement in the axial direction is restricted.

  Next, when the mating pipe 2 fitted with the retainer 5 in this way is inserted into the retainer holding portion 13 of the connector main body 4, each wing portion 16 of the retainer 5 is constricted by the entry side end of the retainer holding portion 13. The pawl 17 passes through the entrance side end of the retainer holding portion 13, and the locking pawl 17 returns to the window 18 by returning to the original state of each wing portion 16 after passing through the entrance side end. The stopper 19 is engaged with the edge of the window portion 18 and the mating pipe 2 and the connector body 4 are connected.

  Further, when the mating pipe 2 and the connector main body 4 are separated again, the terminal ends of the wing portions 16 of the retainer 5 remaining protruding outside the retainer holding portion 13 of the connector main body 4 are picked and pushed inward in the radial direction. Thus, the wings 16 may be constricted. In this manner, the stopper 19 is released from the edge of the window 18 of the retainer holding part 13 and the locking is released, so that the mating pipe 2 and the connector main body are released. 4 can be separated again.

  As prior art document information related to a pipe connection structure using this type of quick connector, there is the following Patent Document 1 and the like.

JP 2007-10108 A

  However, in the conventional pipe connection structure as described above, an operation fee for constricting each wing 16 of the retainer 5 to release the connection between the mating pipe 2 and the connector body 4 must be secured. Since the gap corresponding to the operation allowance is opened to the outside, and the retainer holding portion 13 of the connector body 4 is also opened with a window portion 18 for locking with the retainer 5 side. There is a risk that dust or dirt may enter through the gaps or the window 18 and bite into the abrasive. There is a possibility that the retainer 5 and the connector body 4 may be worn by acting as described above.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pipe connection structure capable of preventing wear of a retainer and a connector main body due to biting of foreign matter.

The present invention comprises a connector body attached to the distal end portion of the tube and a retainer attached to the distal end portion of the mating pipe to be connected to the tube, and has a socket shape on the side of the connector body that accepts the mating pipe. A pipe connection structure in which the mating pipe is inserted together with the retainer into the formed retainer holding portion, and the retainer is locked to the retainer holding portion to connect the tube and the mating pipe. A cylindrical neck portion that fits outward from the retainer mounting position in the pipe and a barrel portion that has a larger diameter than the neck portion and encloses the periphery of the retainer are integrally formed continuously. The retainer holding portion can be covered with the dustproof cover in a state where the connector main body and the retainer are locked. Together constituting a includes a flange portion on the rear side than the mounting position of the retainer in the corresponding pipe, the neck portion of the dust cover in a state where engaged and said and said connector body retainer is held against the flange portion It is characterized by having comprised so.

  Thus, in this state, in a state where the mating pipe having the retainer attached to the distal end portion is inserted into the retainer holding portion of the connector main body and the retainer is locked to the retainer holding portion, the retainer is released. Even if a gap corresponding to the operation allowance is open to the outside, or a window portion for locking the retainer holding portion with the retainer side is open, the mating pipe of the retainer Since the range from the rear side to the retainer holding part with respect to the mounting position with respect to is covered with the dustproof cover, entry of foreign matters such as dust and dust into the retainer holding part is prevented.

  In addition, since the retainer holding part is covered and protected by a dust cover, it becomes possible to protect the connector body and the retainer from the impact of an unexpected fallen object, etc., and the connector body and the retainer can be damaged, The possibility that the locking state of the retainer with respect to the retainer holding portion is inadvertently released can be avoided.

Further, in the present invention, a collar portion is provided on the back side from the retainer mounting position in the mating pipe , and the neck portion of the dustproof cover is pressed and held by the collar portion in a state where the connector main body and the retainer are locked. Since the opening end surface of the neck portion of the dustproof cover is surely blocked by the flange portion of the mating pipe, the entry of foreign matter such as dust and dust into the retainer holding portion can be more reliably prevented. Is possible.

  Furthermore, in the present invention, it is preferable that the dust-proof cover is formed of a flexible material. In this way, the dust-proof cover can be easily attached to the mating pipe, and the retainer holding portion can be covered. It becomes easy to do.

  According to the pipe connection structure of the present invention described above, various excellent effects as described below can be obtained.

  (I) According to the first aspect of the present invention, since foreign matter such as dust and dust can be prevented from entering the retainer holding portion, wear of the retainer and the connector main body due to biting of the foreign matter is prevented. Therefore, the soundness of the retainer and the connector main body can be maintained for a long period of time, and the reliability of the pipe connection structure can be greatly improved.

  (II) According to the invention described in claim 1 of the present invention, the connector main body and the retainer can be protected from the impact of an unexpected fallen object, etc., and the connector main body and the retainer can be damaged, or the retainer can be held by the retainer. It is possible to avoid the possibility that the locking state with respect to the part is unintentionally released.

According to the invention described in claim 1, (III) the present invention, can be blocked by the flange portion of reliably mating pipe the opening end surface of the neck portion of the dust cover, foreign substances such as dust and dirt into the retainer holding portion As a result, the wear of the retainer and the connector main body due to the biting of the foreign matter can be more reliably prevented.

(IV) According to the invention described in claim 2 of the present invention, the dustproof cover can be easily attached to the mating pipe, and the retainer holding portion can be easily covered. On the other hand, even if the dustproof cover is increased, the ease of connection work can be maintained as before.

It is a perspective view which shows an example of the form which implements this invention. It is sectional drawing which shows the connection state in the piping connection structure of FIG. It is a perspective view which shows a prior art example. It is sectional drawing which shows the connection state in the piping connection structure of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show an example of an embodiment for carrying out the pipe connection structure of the present invention, and the basic locking structure of the quick connector 3 shown here will be described with reference to FIGS. It is the same as the locking structure in the conventional example explained using, and the same reference numerals as those in FIGS. 3 and 4 denote the same parts.

  That is, also in the pipe connection structure of this embodiment, the connector main body 4 is attached to the distal end portion of the tube 1 and the retainer 5 is attached to the distal end portion of the mating pipe 2 to be connected to the tube 1. A quick connector 3 is used, and the mating pipe 2 is inserted together with the retainer 5 and locked to a retainer holding portion 13 formed in a socket shape on the side of the connector body 4 that accepts the mating pipe 2. However, a cylindrical neck portion 20 that is externally fitted to the far side of the retainer 5 in the mating pipe 2 and a cylindrical shape having a diameter larger than that of the neck portion 20 are formed to enclose the periphery of the retainer 5. A dust-proof cover 22 made of a flexible material (such as a weather-resistant rubber material) in which the body portion 21 is integrally molded continuously, and includes the connector body 4 and the retainer. And 5 at the locked state by the dustproof cover 22 where is configured so as to cover the retainer holding portion 13 is in the features.

  More specifically, when the retainer 5 is pushed from the tip side of the mating pipe 2 and pushed in, each wing portion 16 of the retainer 5 is pushed and expanded by the bulge portion 14 so that the locking claw 17 gets over the bulge portion 14. The locking claw 17 is locked to the bulge portion 14 by returning the wing portions 16 to the original state after overcoming the bulge portion 14, and the tip of the retainer 5 with respect to the bulge portion 14. The annular portion 15 is also abutted and locked, and the retainer 5 is attached to the mating pipe 2 in a state where movement in the axial direction is restricted.

  Further, when the mating pipe 2 fitted with the retainer 5 in this way is inserted into the retainer holding portion 13 of the connector body 4, each wing portion 16 of the retainer 5 is constricted by the entry side end of the retainer holding portion 13. The pawl 17 passes through the entrance side end of the retainer holding portion 13, and the locking pawl 17 returns to the window 18 by returning to the original state of each wing portion 16 after passing through the entrance side end. The stopper 19 is engaged with the edge of the window 18 so that the mating pipe 2 and the connector body 4 are connected.

Here, the mating pipe 2 in FIGS. 1 and 2, the flange portion 23 is formed at the back side of the mounting position of the retainer 5, to fasten the front Symbol male screw portion 24 formed at the base end portion of the mating pipe 2 Contact Ri becomes the flange portion 23 which functions as a nut portion when, to by state engaged with connector body 4 and the retainer 5 neck portion 20 of the dust cover 22 is held against the flange portion 23 It is configured (see FIG. 2).

  Thus, if the pipe connection structure is configured in this way, the mating pipe 2 with the retainer 5 attached to the distal end portion is inserted into the retainer holding portion 13 of the connector body 4 so that the retainer 5 is locked to the retainer holding portion 13. In this state, a gap corresponding to an operation allowance for performing the releasing operation of the retainer 5 is opened to the outside, or the window portion 18 for locking the retainer holding portion 13 with the retainer 5 side. Even when the retainer 5 is open, the dust cover 22 covers the range from the rear side of the retainer 5 to the mating pipe 2 to the retainer holding portion 13. Intrusion of foreign matter such as dust and dirt.

  Therefore, according to the above-described embodiment, it is possible to prevent foreign matter such as dust and dust from entering the retainer holding portion 13, and thus it is possible to prevent wear of the retainer 5 and the connector main body 4 due to the biting of the foreign matter. In addition, the soundness of the retainer 5 and the connector main body 4 can be maintained for a long period of time, and the reliability of the pipe connection structure can be greatly improved.

  Further, since the retainer holding portion 13 is covered and protected by the dust-proof cover 22, the connector body 4 and the retainer 5 can be protected from an unexpected impact such as falling objects, and the connector body 4 and the retainer 5 can be protected. It is possible to avoid the possibility of damage to the retainer 5 or the inadvertent release of the retaining state of the retainer 5 with respect to the retainer holding portion 13.

Further , a collar portion 23 is formed on the rear side of the mating pipe 2 from the mounting position of the retainer 5, and the neck portion 20 of the dust-proof cover 22 is engaged with the collar portion 23 in a state where the connector body 4 and the retainer 5 are locked. in the which is configured to be pressed and held, can occlude the neck portion 20 the flange portion 23 of the opening end face securely mating pipe 2 of the dust cover 22, dust or the like into the retainer holding portion 13 Therefore, it is possible to more reliably prevent the retainer 5 and the connector body 4 from being worn by the biting of the foreign matter.

  Further, if the dust-proof cover 22 is formed of a flexible material (such as a weather-resistant rubber material), the dust-proof cover 22 can be easily attached to the mating pipe 2, and the retainer holding part 13 can be attached to the retainer holding part 13. Since covering can also be facilitated, the ease of connection work can be maintained as before even if the dustproof cover 22 is increased with respect to the existing structure.

  In addition, the pipe connection structure of the present invention is not limited to the above-described embodiment, and the retainer locking structure with respect to the tip of the mating pipe, and the locking structure between the retainer and the retainer holding part, The present invention is not necessarily limited to the illustrated structure, and various locking structures that can be restrained in the axial direction by locking can be adopted. Of course, various changes can be made without departing from the scope.

1 Tube 2 Mating Pipe 4 Connector Body 5 Retainer 13 Retainer Holding Part 20 Neck Part 21 Body 22 Dustproof Cover 23 Gutter

Claims (2)

A retainer formed in a socket shape on the side of the connector body that accepts the mating pipe, comprising a connector body mounted on the tip of the tube and a retainer mounted on the tip of the mating pipe to be connected to the tube A pipe connection structure in which the mating pipe is inserted into the holding portion together with the retainer, and the retainer is locked to the retainer holding portion to connect the tube and the mating pipe. A dustproof cover in which a cylindrical neck portion that is externally fitted to the back side from the mounting position and a barrel portion that has a diameter larger than the neck portion and encloses the periphery of the retainer are integrally formed. provided, it is configured so as to cover the retainer holding portion by the dust cover in a state where engaged and said and said connector body retainer In addition, a collar portion is provided on the back side from the retainer mounting position on the mating pipe so that the neck portion of the dustproof cover is pressed and held by the collar portion in a state where the connector main body and the retainer are locked. pipe connection structure, characterized in that configuration was. The pipe connection structure according to claim 1 , wherein the dustproof cover is formed of a flexible material.

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