JP2014066328A - Conversion joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conversion joint capable of realizing both stable cut-off performance and lock performance and further facilitating manufacture of the conversion joint.SOLUTION: A conversion joint 10 has a metallic main body 12, and an outer peripheral surface of a first connection part 18 of the main body is formed with three annular protrusions and a stopper 30 protruded out. Then, each of the three valleys of which longitudinal section is a groove shape is formed between the adjoining annular protrusions and between the stopper and its adjoining annular protrusions. A first valley is formed to have a "shallow" groove shape smaller than a depth of each of a second valley and a third valley. A synthetic resin pipe 14 is fitted to the outer peripheral surface of the first connection part 18 and a ring member 16 is fitted to an outer peripheral surface of the synthetic resin pipe 14. The ring member 16 presses the inner peripheral surface of the synthetic resin pipe 14 against the annular protrusions. Consequently, stable cut-off performance and lock performance are realized, and the conversion joint can be simply manufactured.

Description

  The present invention relates to a conversion joint, and more particularly to a conversion joint used for connecting, for example, a metal part and a synthetic resin part.

  An example of a conventional conversion joint of this type is disclosed in Patent Document 1.

In the conversion joint of Patent Document 1, a resin tube is fitted on the outer peripheral surface of a metal main body having an O-ring and a raised portion formed on the outer surface, and a ring is formed on the outer peripheral surface of the enlarged diameter portion of the resin tube expanded by the raised portion. Are mated. By doing so, the space between the inner surface of the resin tube and the metal main body is water-stopped by the 0-ring, and the ring tightens and compresses the expanded diameter portion of the resin tube, so that the inner peripheral surface of the resin tube is raised. Crimped to the outer surface of
Patent 3717145 [F16L 21/08]

  However, in the technique of Patent Document 1, water is stopped between the inner surface of the resin tube and the metal main body by a 0-ring, and therefore, there is a possibility that water-stopping cannot be secured if the 0-ring deteriorates. Furthermore, when the ring is caulked and fitted to the outer peripheral surface of the resin tube, there is a concern that the strength of the ring will be reduced, and the resin tube will not be able to come out of the metal body. Since an extra caulking step is required, the manufacturing operation is complicated accordingly.

  Therefore, the main object of the present invention is to provide a novel conversion joint.

  Another object of the present invention is to provide a conversion joint that is easy to manufacture and that can exhibit stable water-stopping performance and slip-off prevention performance.

  The present invention employs the following configuration in order to solve the above problems. Note that reference numerals in parentheses, supplementary explanations, and the like indicate correspondence relationships with embodiments described later to help understanding of the present invention, and do not limit the present invention in any way.

  A first invention is a main body made of metal and having a cylindrical resin pipe connecting portion, a plurality of annular protrusions formed from the outer peripheral surface of the resin pipe connecting portion and arranged in the axial direction of the resin pipe connecting portion, a resin A stopper formed so as to protrude from the outer peripheral surface of the main body on the back side in the axial direction from the pipe connecting portion, between the adjacent annular protrusions, and between the stopper and the adjacent annular protrusion, at least the first A plurality of troughs including a first trough having a depth and a second trough having a second depth deeper than the first trough, and having an inner diameter smaller than the outer diameter of the annular protrusion and fitted on the outer peripheral surface of the resin pipe connecting portion A conversion joint having a synthetic resin pipe whose one end is in contact with the stopper, and a ring member that is fitted to the outer peripheral surface of the synthetic resin pipe and presses the inner peripheral surface of the synthetic resin pipe to the plurality of annular protrusions. is there.

  In 1st invention, the conversion coupling (10) is provided with the metal main body (12), and is used in order to connect metal parts and synthetic resin parts. The main body includes a resin pipe connecting portion (18) formed in a short tubular shape having a predetermined diameter. A plurality of annular protrusions (22, 24, 26) and a stopper (30) project from the outer peripheral surface of the resin pipe connecting portion. A plurality of valleys (32, 34, 36) whose longitudinal sections are groove-shaped are formed between the adjacent annular protrusions and between the stopper and the adjacent annular protrusion. Of the plurality of valleys, the first valley (32) is formed in a “shallow” groove shape whose depth (d1) is smaller than the depth (d2, d3) of the second valley (34, 36). . The second valley is formed in a “deep” groove shape having a depth larger than that of the first valley. Further, the synthetic resin pipe (14) is fitted to the outer peripheral surface of the resin pipe connecting portion of the main body with one end abutting against the stopper. The synthetic resin tube is formed of a polyolefin-based resin, and the inner diameter thereof is set to be smaller than the outer diameter of the annular protrusion. Further, a ring member (16) is fitted on the outer peripheral surface of the synthetic resin pipe. The ring member presses the inner peripheral surface of the synthetic resin tube to each annular protrusion, and the resin crushed by the annular protrusion enters the inside of each valley. And while the water stop performance between a main body and a synthetic resin pipe | tube is ensured by the resin which entered the 1st trough, the synthetic resin pipe | tube with respect to a main body is obtained by the resin which entered the 2nd trough being latched by the trough The ability to prevent slipping out is ensured.

  According to the first aspect of the invention, it is possible to exhibit stable water stop performance and drop prevention performance, and it is possible to easily manufacture a conversion joint.

  The second invention is dependent on the first invention, and the second valley is formed on the inner side in the axial direction from the first valley.

  In the second invention, the first valley (32) is disposed on the nearer side in the axial direction than the second valley (34, 36). For this reason, since the resin crushed by the annular protrusions (22, 24, 26) enters the first valley, the water stop performance between the main body and the synthetic resin pipe can be more reliably ensured. .

  The third invention is dependent on the first or second invention, the inner diameter of the ring member, the distance between the inner peripheral surface of the ring member and the bottom of the first valley is smaller than the thickness of the synthetic resin tube, And the distance between the inner peripheral surface of a ring member and the bottom of a 2nd trough was set so that it might become larger than the thickness of a synthetic resin pipe | tube.

  In the third invention, when the ring member is fitted to the outer peripheral surface of the synthetic resin pipe (14), the distance between the bottom of the first valley (32) and the inner peripheral surface of the ring member (16) is the synthetic resin pipe. The inner diameter of the ring member is set so that the thickness is smaller than the thickness of (14) and the distance between the bottom of the second valley (34, 36) and the inner peripheral surface of the ring member is larger than the thickness of the synthetic resin pipe. Is done. For this reason, the resin is crushed between the first valley and the inner peripheral surface of the synthetic resin tube, and the resin that has entered the inside of the first valley is pressure-bonded to the bottom surface of the first valley to increase the water-stopping property. Is possible.

  A fourth invention is dependent on the invention according to any one of the first to third aspects, and is a resin escape that forms a space between the inner peripheral surface of the ring member and a stopper in the axially inner end portion. Part is formed.

  According to the fourth aspect of the present invention, a resin escape portion (44) chamfered in a tapered shape with a downward slope toward the end edge is formed at the inner peripheral end portion on the inner side in the axial direction of the ring member (16). . This resin escape portion forms a space between the stopper (30) and the space is used as a escape space for the resin crushed when the ring member is fitted to the outer peripheral surface of the synthetic resin pipe (14).

  According to the fourth invention, it is possible to prevent the occurrence of problems such as resin leakage.

  5th invention is dependent on invention in any one of 1 thru | or 4, 1st trough is formed in the most front end side on the outer peripheral surface of a resin pipe connection part among several cyclic | annular protrusions. The height difference between the first annular protrusion and the first valley is formed adjacent to the back side of the annular protrusion, and the height difference between the other annular protrusion and another valley adjacent to the back side is smaller. Was set as follows.

  In 5th invention, a 1st trough (32) is a trough arrange | positioned at the front end side of the resin pipe connection part (18) among each trough (32, 34, 36), Comprising: It is formed in a groove shape having a small height difference (h1) between adjacent annular protrusions (22), and the difference in height is adjacent to the other annular protrusions (24, 26) and the back side thereof. It is set to be smaller than the height difference (h2, h3) from the other valleys (34, 36).

  According to the fifth aspect of the present invention, when the synthetic resin tube is externally fitted to the outer peripheral surface of the resin tube connecting portion, the inner peripheral surface of the synthetic resin tube is hardly damaged (such as a dent). In addition, since the first valley is formed on the most distal end side of the resin pipe connecting portion, it is caused by scratches on the inner peripheral surface of the synthetic resin pipe at the annular protrusion or valley portion on the back side. There will be no decline in water stoppage performance.

  A sixth invention is dependent on the invention according to any one of the first to fifth aspects, and the plurality of annular protrusions includes a first annular protrusion formed on the most distal end side on the outer peripheral surface of the resin pipe connecting portion, A first chamfered portion with a chamfered corner is formed at the outer peripheral end of the first annular protrusion in the axial direction, and a second chamfered portion with a chamfered corner at the inner peripheral end of the other end of the ring member. Is formed.

  In the sixth invention, the plurality of annular protrusions (22, 24, 26) include a first annular protrusion (22) formed on the most distal side on the outer peripheral surface of the resin pipe connecting portion (18). A first chamfered portion (28) having a chamfered corner is formed at the outer peripheral end on the far side in the axial direction of one annular protrusion. Further, the corner portion of the inner peripheral end of the front end surface of the ring member (16) is chamfered, and a second chamfered portion (42) facing the first chamfered portion of the first annular protrusion is formed there. Yes.

  According to the sixth aspect of the invention, it is possible to avoid the occurrence of problems such as tearing of the synthetic resin pipe due to the resin sandwiched between the first chamfered portion and the second chamfered portion being divided.

  The seventh invention is dependent on any one of the first to sixth inventions, and the length of the first valley in the axial direction is set larger than the length of the second valley in the axial direction.

  In the seventh invention, the axial length of the first valley (32) formed in the “shallow” groove shape is longer than the axial length of the second valley (34, 36) formed in the “deep” groove shape. Is set to be larger. By carrying out like this, the range which water-stops between the crushed resin and the bottom face of the 1st trough can be enlarged, and water stop performance can be improved.

  According to the present invention, the conversion joint is easy to manufacture, and the resin crushed by the annular protrusion is allowed to enter the “shallow” valley for water stop and the “deep” valley for retaining. Therefore, stable water stopping performance and omission prevention performance can be exhibited.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

It is a perspective view which shows the conversion coupling of one Example of this invention. It is an illustration figure which shows a mode that the conversion coupling of FIG. 1 is used. (A) is a front view which shows the conversion coupling of FIG. 1, (b) is sectional drawing which shows the conversion coupling of FIG. It is a perspective view which shows the main body of the conversion coupling of FIG. (A) is a front view which shows the main body of FIG. 4, (b) is sectional drawing which shows the main body of FIG. It is the enlarged view to which the principal part of the main body of FIG. 4 was expanded. (A) is an illustration figure which shows the depth dimension of the trough of the main body of FIG. 4, (b) is an illustration figure which shows the width dimension of a valley. It is the enlarged view to which the principal part of the conversion coupling of FIG. 1 was expanded. It is an illustration figure which shows a mode that the resin of the synthetic resin pipe was crushed with the ring member. It is an illustration figure which shows a mode that the conversion coupling of FIG. 1 is assembled. It is a perspective view which shows the conversion coupling of other one Example of this invention. (A) is a front view which shows the conversion coupling of FIG. 11, (b) is sectional drawing which shows the conversion coupling of FIG. It is a perspective view which shows the conversion coupling of another one Example of this invention. (A) is a front view which shows the conversion coupling of FIG. 13, (b) is sectional drawing which shows the conversion coupling of FIG.

  1 and 2, a conversion joint 10 according to an embodiment of the present invention includes a metal main body 12, a synthetic resin pipe 14 fitted to the outer peripheral surface of the main body 12, and a synthetic resin pipe 14. A ring member 16 fitted to the outer peripheral surface is provided, and is used for connecting a metal part and a synthetic resin part.

  As an example, as shown in FIG. 3, the conversion joint 10 includes a metal valve 100 made of a metal such as a copper alloy as a metal part, and an electricity made of a polyolefin resin such as polyethylene as a part made of a synthetic resin. It is used to connect the fusion joint 102, but it is not limited to this, and it should be pointed out in advance that it can be applied to various applications.

  As shown in FIGS. 4 and 5, the main body 12 is made of a metal such as a copper alloy, includes the first connection portion 18 and the second connection portion 20, and is formed in a cylindrical shape as a whole.

  The first connecting part 18 is a connecting part (resin pipe connecting part) to the synthetic resin pipe 14 and is formed in a short tubular shape having a predetermined diameter, and its outer diameter is, for example, 22 mm, and its length is For example, 14 mm. A plurality of, in this embodiment, three annular protrusions 22, 24, and 26 are formed on the outer peripheral surface of the first connection portion 18. The annular protrusions 22, 24, and 26 are formed side by side with a predetermined interval in the axial direction of the first connecting portion 18, and are annular (ring-shaped) so as to cover the entire outer peripheral surface of the first connecting portion 18. Protruding.

  In this embodiment, the first annular protrusion 22 and the second annular ring are formed in order from the tip formed on the outer peripheral surface of the first connecting portion 18 (that is, the front side in the axial direction) to the back side. The protrusion 24 and the third annular protrusion 26 are hereinafter referred to as “annular protrusions 22, 24, and 26” when there is no need to distinguish them in the description.

  As shown in FIG. 6, each annular protrusion 22, 24, 26 protrudes so that its longitudinal section (circumferential section) has a substantially trapezoidal shape, and the height positions of the respective outer peripheral ends are aligned. Yes. For example, the diameter of the outer peripheral end of each annular protrusion 22, 24, 26 is 24 mm. The front side surface of each annular protrusion 22, 24, 26 has an inclined surface 22a that is inclined downward toward the outer peripheral end so that the synthetic resin tube 14 can be easily fitted to the outer peripheral surface of the first connecting portion 18. , 24a, 26a. Further, the back side surfaces of the annular protrusions 22, 24, 26 are formed as vertical surfaces 22 b, 24 b, 26 b that rise perpendicular to the outer peripheral surface of the first connection portion 18.

  Further, the inclined surface 22 a of the first annular protrusion 22 formed on the most distal end side on the outer peripheral surface of the first connection portion 18 is formed so as to be continuous from the edge of the first connection portion 18. Furthermore, the 1st chamfering part 28 which chamfered the corner | angular part is formed in the outer peripheral end of the back | inner side of the 1st annular protrusion 22. FIG.

  Furthermore, a stopper 30 is formed on the outer peripheral surface of the first connecting portion 18 on the back side of the annular protrusions 22, 24, 26. The stopper 30 is formed to protrude from the outer peripheral surface of the first connection portion 18 in a bowl shape. The length (height) of the stopper 30 in the vertical direction is set to be higher than the outer peripheral ends of the annular protrusions 22, 24, and 26, for example, 38 mm. Furthermore, the stopper 30 has a hexagonal outer shape when viewed from the axial direction of the first connecting portion 18 so that a jig such as a spanner or a pipe wrench can be easily locked.

  In this way, the first annular protrusion 22, the second annular protrusion 24, the third annular protrusion 26, and the stopper 30 are formed on the outer peripheral surface of the first connecting portion 18 in order from the near side to the far side. Yes. And troughs 32, 34, and 36 each having a longitudinal cross section are formed between the adjacent annular protrusions and between the stopper 30 and the third annular protrusion 26 adjacent thereto.

  In this embodiment, the valley formed between the first annular protrusion 22 and the second annular protrusion 24 is defined as the first valley 32, and is formed between the second annular protrusion 24 and the third annular protrusion 26. The trough is defined as the second trough 34, and the trough formed between the third annular protrusion 26 and the stopper 30 is defined as the third trough 36. However, in the following description, it is not necessary to distinguish these These are simply described as valleys 32, 34, and 36.

  Here, the valleys 32, 34, and 36 will be described in detail with reference to FIGS.

  The first trough 32 is a trough disposed on the most distal end side of the first connecting portion 18 among the three troughs 32, 34, 36, and the thickness of the first connecting portion 18 is on the bottom surface of the first trough 32. The dimension is set so as to be thicker than other portions, and a bottom raised portion 38 is formed there. And the 1st trough 32 is formed in the groove shape which has the height difference h1 between the 1st cyclic | annular protrusions 22 adjacent to the front side of itself, and has the width | variety w1 in an axial direction, The height difference h1 Is 0.5 mm, for example, and its width w1 is, for example, 3 mm.

  Further, the second valley 34 is a valley arranged on the back side of the first valley 32, and has a height difference h2 between the second annular projection 24 adjacent to the first valley 32 and the axial direction. The height difference h2 is set larger than the height difference h1 of the first valley 32, for example, 1 mm, and the width w2 is the width w1 of the first valley 32. Is set smaller than, for example, 1.5 mm.

  Further, the third valley 36 is a valley that is disposed on the back side of the first valley 32 and the second valley 34, and has a height difference h3 between the third valley 36 and the third annular protrusion 26 adjacent to the front side thereof. The height difference h3 is greater than the height difference h1 of the first valley 32 and equal to or substantially equal to the height difference h2 of the second valley 34. The width w3 is set to be larger than the width w2 of the second valley 34 and equal to or substantially equal to the width w1 of the first valley 32, for example, 3 mm.

  That is, the height difference h1 of the first valley 32 is set smaller than the height differences h2 and h3 of the other second and third valleys 34 and 36, and the width w1 is greater than the width w2 of the second valley 32. It can be said that the groove is formed in a groove shape having a small height difference and a wide width. The height difference h2 of the second valley 34 is set larger than the height difference h1 of the first valley 32, and the width w2 is set smaller than the width w1 of the first valley 32. It can be said that it is formed in a “large” and “narrow” groove shape. Further, the height difference h3 of the third valley 36 is set larger than the height difference h1 of the first valley 32, and the width w3 is set larger than the width w2 of the second valley 34. It can be said that it is formed in a “large” and “wide” groove shape.

  However, the expression “the height difference is small”, “the height difference is large”, “narrow”, “wide” in the valley here means that the valley is “the height difference is small” compared to other valleys, It should be noted that it means “large difference in elevation”, “narrow”, “wide”.

  4 and 5, the second connection portion (metal connection portion) 20 described above is formed on the back side of the first connection portion 18 with the stopper 30 interposed therebetween. The second connection portion 20 is a connection portion with a metal part (metal valve 100) and has a short tube shape extending in the same direction as the first connection portion 18. The second connection part 20 is formed continuously so that the first connection part 18 and the internal space communicate with each other. On the outer peripheral surface of the second connection portion 20, a male screw portion 40 that is screwed with the female screw portion 106 formed in the connection port 104 of the metal valve 100 is formed (see FIG. 3).

  Returning to FIG. 2, the synthetic resin tube 14 is fitted to the outer peripheral surface of the first connecting portion 18 of the main body 12. The synthetic resin tube 14 is a cylindrical tube formed of a polyolefin-based resin such as polyethylene. As shown in FIG. 8, the first resin tube 14 is in contact with (locked to) the stopper 30 of the main body 12. It arrange | positions on the outer peripheral surface of the connection part 18. As shown in FIG.

  The axial length of the synthetic resin pipe 14 is set to be sufficiently longer than the first connection portion 18 of the main body 12, and the other end is a connection portion with a component made of synthetic resin (the electrofusion joint 102). The surface is scraped and inserted into the receptacle 108 of the electrofusion joint 102, and electrofusion bonding is performed (see FIG. 3).

  The inner diameter of the synthetic resin tube 14 is set to be smaller than the outer diameter of the first connection portion 18 and is, for example, 21 mm. For this reason, when the synthetic resin tube 14 is fitted on the outer peripheral surface of the first connection portion 18 of the main body 12, the first connection portion 18 of the main body 12 is “forced” inside the synthetic resin tube 14, that is, the main body 12. The first connection portion 18 accommodates (inserts) the distal end portion of the synthetic resin tube 14 while expanding it in the outer diameter direction. As will be described in detail later, the distal end portion of the synthetic resin tube 14 is expanded by elastic deformation. The inner peripheral surface of the annular protrusions 22, 24, and 26 comes into close contact with the outer peripheral ends of the annular protrusions 22, 24, and 26 by a restoring force. The outer diameter of the synthetic resin tube 14 is, for example, 27 mm, that is, the thickness of the synthetic resin tube 14 is, for example, 3 mm.

  Furthermore, returning to FIG. 2, the ring member 16 is fitted at a predetermined position on the outer peripheral surface of the synthetic resin pipe 14. As shown in FIG. 8, the ring member 16 is formed in a short cylindrical shape with a metal such as stainless steel, and one end (back side) of the ring member 16 is in contact (locked) with the stopper 30 of the main body 12. Is disposed on the outer peripheral surface of the first connecting portion 18. The thickness of the ring member 16 is 4 mm, for example.

  In addition, the inner diameter of the ring member 16 is set to be slightly smaller than the outer diameter of the distal end portion (expanded portion) of the synthetic resin pipe 14 expanded by the first connection portion 18, for example, 29 mm. Therefore, when the ring member 16 is fitted on the outer peripheral surface of the synthetic resin tube 14, the tip of the synthetic resin tube 14 is “forced” inside the ring member 16, that is, the synthetic resin tube 14 is inserted by the ring member 16. As will be described later in detail, the inner peripheral surface of the synthetic resin tube 14 is firmly pressed against the annular protrusions 22, 24, and 26, so that the ring member 16 and the main body 12 are pressed. The resin between the first connecting portion 18 is crushed.

  Furthermore, the inner diameter of the ring member 16 is such that the distance between the bottom surface of the first valley 32 and the inner peripheral surface of the ring member 16 when the ring member 14 is fitted to the outer peripheral surface of the synthetic resin tube 14 is The distance between the bottom surface of the second and third valleys 34 and 36 and the inner peripheral surface of the ring member 16 is set to be equal to or greater than the thickness of the synthetic resin tube 14. Has been.

  Specifically, as can be clearly understood from FIG. 9, the depth d1 of the first valley 32 with respect to the inner peripheral surface of the ring member 16, that is, the bottom surface of the first valley 32 and the inner peripheral surface of the ring member 16. The distance between them is set to be smaller than the thickness of the synthetic resin tube 14 and is, for example, 3 mm.

  The depth d2 of the second valley 34 with respect to the inner peripheral surface of the ring member 16, that is, the distance between the bottom surface of the second valley 34 and the inner peripheral surface of the ring member 16 is the thickness of the synthetic resin tube 14. For example, it is 3.5 mm.

  Further, the depth d3 of the third valley 36 based on the inner peripheral surface of the ring member 16, that is, the distance between the bottom surface of the third valley 36 and the inner peripheral surface of the ring member 16 is the thickness of the synthetic resin tube 14. For example, it is 3.5 mm.

  That is, it can be said that the first valley 32 is formed in a “shallow” groove shape whose depth d1 is set smaller than the depths d2 and d3 of the other second and third valleys 34 and 36. Further, it can be said that the second valley 34 is formed in a “deep” groove shape in which the depth d2 is set larger than the depth d1 of the first valley 32. Further, it can be said that the third valley 36 is formed in a “deep” groove shape in which the depth d3 is set larger than the depth d1 of the first valley 32.

  However, the expressions “shallow” and “deep” here are based on the inner peripheral surface of the ring member 16 as a reference, and the valley is “shallow” compared to other valleys. Note that it means “deep”, “narrow”, “wide”.

  Furthermore, the axial length of the ring member 16 is, for example, 10 mm. For example, in this embodiment, when one end surface of the ring member 16 abuts against the stopper 30, the axial position of the other end surface is aligned with the axial position of the vertical surface 22 b of the first annular protrusion 22. Is set. In addition, a corner portion of the inner peripheral end of the front end surface of the ring member 16 is chamfered, and a second chamfered portion 42 that faces the first chamfered portion 28 of the first annular protrusion 22 is formed there.

  Furthermore, a resin escape portion 44 that is chamfered in a tapered shape that is inclined downward toward the end edge is formed at the inner peripheral end portion on the back side of the ring member 16. The resin escape portion 44 forms a space (empty space) between the stopper 30 and the resin escape portion 44. As will be described later in detail, this space is used as a space for allowing the resin crushed between the ring member 16 and the first connection portion 18 of the main body 12 to enter (escape). .

  A method for manufacturing such a conversion joint 10 will be described below.

  First, the synthetic resin tube 14 is fitted on the outer peripheral surface of the first connecting portion 18 of the main body 12. Specifically, as shown in FIGS. 10A and 10B, the synthetic resin tube 14 is pushed in along the inclined surface 22 a of the first annular protrusion 22 of the main body 12. Then, the first connecting portion 18 of the main body 12 is “forced” inside the synthetic resin tube 14. That is, while the diameter of the tip portion of the synthetic resin pipe 14 is increased, the annular protrusions 22, 24, and 26 of the first connection portion 18 of the main body 12 are passed over and pushed in until they contact the stopper 30 of the main body 12.

  Then, the inner peripheral surface of the synthetic resin tube 14 is brought into close contact with the annular protrusions 22, 24, and 26 due to the restoring force of the expanded diameter portion of the synthetic resin tube 14 to shrink to the original diameter. The ring member 16 is externally fitted on the outer peripheral surface of the synthetic resin tube 14 that is in close contact with the annular protrusions 22, 24, and 26. Specifically, as shown in FIG. 10 (c), the ring member 16 is moved (slid) along the outer peripheral surface of the synthetic resin tube 14, and the enlarged diameter portion of the synthetic resin tube 14 is moved inside the ring member 16. To “force”. That is, the enlarged diameter portion of the synthetic resin pipe 14 is pressed in the inner diameter direction by the ring member 16, and the inner peripheral surface of the synthetic resin pipe 14 is firmly crimped to the annular protrusions 22, 24, 26. Push in until it comes into contact with the stopper 30 of the main body 12.

  Then, since the ring member 16 is formed of a metal harder than the synthetic resin tube 14, each annular protrusion 22, 24, 26 bites into the inner peripheral surface side of the synthetic resin tube 14 as shown in FIG. At the same time, the crushed resin enters the valleys 32, 34 and 36.

  At this time, in the first valley 32 formed in the “shallow” groove shape, the depth d1 is set to be smaller than the thickness of the synthetic resin tube 14, so that the first valley 32 is crushed and enters the inside of the first valley 32. Resin is filled there and pressed onto the bottom surface of the first valley 32. Thereby, not only the part (namely, contact part) where each annular protrusion 22, 24, 26 bites into the inner peripheral surface of the synthetic resin pipe 14, but also between the inner peripheral surface of the synthetic resin pipe 14 and the first trough 32. The water gap between the synthetic resin pipe 14 and the first connecting portion 18 of the main body 12 can be secured.

  Further, in the second valley 34 formed in the “deep” groove shape, the depth d2 of the second valley 34 is set to be larger than the thickness of the synthetic resin tube 14, and the second annular protrusion adjacent to the front side of itself is set. The difference in height h2 from the upper portion 24 is large, so that not only the annular protrusions 22, 24, 26 that have digged into the inner peripheral surface of the synthetic resin tube 14, but also the resin that has been crushed and entered the second valley 34 Also, the anchor effect is exhibited and the second annular protrusion 24 is locked. As a result, the synthetic resin tube 14 can be more firmly locked to the first connecting portion 18 of the main body 12, and the ability to prevent the synthetic resin tube 14 from coming off from the main body 12 is ensured.

  Further, in the third valley 36 formed in a “deep” and “wide” groove shape, a relatively large space is secured inside the third valley 36 due to the large depth d3 and width w3 of the third valley 36. Therefore, the resin that has lost its escape from the resin crushed between the ring member 16 and the first connecting portion 18 of the main body 12 enters the third valley 36 and is held there.

  In addition, the resin crushed between the ring member 16 and the first connection portion 18 of the main body 12 also enters the space formed between the resin escape portion 44 and the stopper 30, thereby crushed. The discharged resin is prevented from flowing out (that is, the occurrence of resin leakage).

  In this way, the manufacture of the conversion joint 10 is completed.

  Here, when the inventors of the present application conducted experiments, the present invention is highly effective by appropriately adjusting the dimensions of the main body 12 and the ring member 16 and setting the following three indices within a predetermined range. It was confirmed that water stopping performance and omission prevention performance can be achieved.

  The first of the three indicators is that when the synthetic resin tube 14 is fitted on the outer peripheral surface of the first connecting portion 18 of the main body 12 with respect to the normal inner diameter of the synthetic resin tube 14, “Diameter of expansion” indicating the ratio of the diameter of the increase in the inner diameter when the diameter of the annular protrusion 22, 24, 26 is expanded at the position of the outermost end of the annular protrusion (projecting in the outer diameter direction), This “expansion degree” is preferably set to 3-20%, more preferably 5-15%.

  The second of the three indicators is that the ring member 16 is externally fitted to the outer peripheral surface of the synthetic resin tube 14 with respect to the thickness of the synthetic resin tube 14 before the ring member 16 is externally fitted. Is the “thickness” indicating the ratio of the thickness of the synthetic resin tube 14 compressed at the positions of the outer peripheral ends of the annular protrusions 22, 24, 26, and this “shrinkage” is 5-20%. Is preferable.

  Further, the third of the three indicators indicates the ratio of the volume of the resin held in the space to the volume of the space between the first connecting portion 18 of the main body 14 and the ring member 16 " The “filling degree” is preferably set to 90-98%.

  As described above, in this embodiment, the synthetic resin tube 14 is “forced” and fitted on the outer peripheral surface of the first connecting portion 18 of the main body 12 to expand the diameter of the synthetic resin tube 14 and expand the diameter. The ring member 16 is “forcedly inserted” on the outer peripheral surface of the synthetic resin pipe 14 so as to be externally fitted. Then, the resin on the inner peripheral surface side of the synthetic resin tube 14 crimped to each annular protrusion 22, 24, 26 by the ring member 16 is crushed, and the crushed resin is formed into a “shallow” groove shape. The valley 32 and the second valley 34 formed in a “deep” groove shape are allowed to enter.

  That is, the first valley 32 and the synthetic resin tube 14 are formed by forming the first valley 32 in a “shallow” groove shape and setting the depth d1 of the first valley 32 smaller than the thickness of the synthetic resin tube 14. It is possible to squeeze the resin between the inner peripheral surface and the resin that has entered the inside of the first valley 32 to be crimped to the bottom surface of the first valley 32. Therefore, in addition to the contact portion between the inner peripheral surface of the synthetic resin pipe 14 and each annular protrusion 22, 24, 26, the gap between the bottom surface of the first valley 32 and the synthetic resin pipe 14 can be closed. Therefore, more reliable water stop performance can be ensured between the main body 12 and the synthetic resin pipe 14.

  Moreover, since the first valley 32 is formed in a “wide” groove shape, the range in which the water is stopped between the resin that has been crushed and entered the first valley 32 and the bottom surface of the first valley 32 is provided. The water stop performance can be improved by that amount. Further, for example, the water stop performance is not deteriorated due to, for example, the deterioration of the 0 ring.

  Further, the second valley 34 is formed in a “deep” groove shape, and the height difference h2 between the second annular protrusion 24 adjacent to the front side of the second valley 34 is large (that is, the groove shape is “large in height difference”). As a result, in addition to the annular protrusions 22, 24, and 26, which are bitten into the inner peripheral surface of the synthetic resin tube 14, the resin that has entered the inside of the second valley 34 also exhibits an anchor effect, and the second annular shape is exhibited. The protrusion 24 can be locked. Therefore, the synthetic resin tube 14 is more firmly locked to the first connection portion 18 of the main body 12, and the ability to prevent the synthetic resin tube 14 from coming off from the main body 12 can be ensured.

  Moreover, since the second valley 34 is formed in a “narrow” groove shape, the resin that has been crushed and entered the second valley 34 can be more easily penetrated to a deeper position of the second valley 34. It is possible to stabilize the omission prevention performance. Further, for example, it is not necessary to perform a caulking operation of a metal ring.

  Therefore, according to this embodiment, it is possible to exhibit stable water stop performance and drop prevention performance, and it is possible to easily manufacture the conversion joint 10.

  Further, in this embodiment, the first valley 32 is formed in a groove shape having a “small height difference”, and further, the first chamfered portion is formed by chamfering the corner of the outer peripheral end on the back side of the first annular protrusion 22. 28 is formed, when the synthetic resin tube 14 is “forced” on the outer peripheral surface of the first connecting portion 18 of the main body 12 to be fitted outside, the inner peripheral surface of the synthetic resin tube 14 is scratched (recessed). Etc.).

  In addition, since the first valley 32 is formed on the most distal end side of the first connecting portion 18, the second and third annular protrusions 24 and 26 and the second and third valleys 34 on the far side are further formed. Even if the inner peripheral surface of the synthetic resin pipe 14 is damaged at the portion 36, 36, the water stop performance is not deteriorated at the first valley 32 due to the scratch. In other words, on the inner peripheral surface of the synthetic resin pipe 14, the second and third annular protrusions 24, 26 are provided in a portion that ensures water stoppage performance with the first valley 32 formed in the “shallow” groove shape. Since there is no damage caused by passing through the portion, and there is only damage caused by passing through the portion of the first annular protrusion 22, the waterproof performance is mainly secured on the inner peripheral surface of the synthetic resin pipe 14. It is avoided that many scratches are made on the part to be done.

  Therefore, according to this embodiment, the water stop performance can be more stably exhibited.

  Furthermore, in this embodiment, the second valley 34 and the third valley 36 formed in the “deep” groove shape are arranged on the back side of the first valley 32 formed in the “shallow” groove shape. . For this reason, the resin crushed between the ring member 14 and the first connection portion 18 of the main body 12 can be preferentially entered into the first valley 32. Therefore, the water stop performance can be reliably ensured.

  Furthermore, in this embodiment, the corner portion of the outer peripheral end on the back side of the first annular protrusion 22 is chamfered to form the first chamfered portion 28, and the corner of the inner peripheral end of the end surface on the near side of the ring member 16 is formed. The second chamfered portion 42 is formed by chamfering the portion. For this reason, it is possible to avoid the occurrence of problems such as tearing of the synthetic resin tube 14 due to the resin sandwiched between the first chamfered portion 28 and the second chamfered portion 42 being divided.

  In the above-described embodiment, the three annular protrusions 22, 24, 26 are formed on the outer peripheral surface of the first connecting portion 18, and between the adjacent annular protrusions as well as the stopper 30 and the third annular protrusion 26 adjacent thereto. The three valleys 32, 34, and 36 are formed between the two, but it is not necessary to be limited to this.

  At least two annular protrusions are formed on the outer peripheral surface of the first connection portion 18, and the depth thereof is smaller than the thickness of the synthetic resin pipe 14 so as to ensure water stopping performance between them and the stopper 30. At least one set of “shallow” valleys and at least one “deep” (and “high difference in height”) valleys that are set deeper than the “shallow” valleys to ensure omission prevention performance are formed. If so, the number of annular protrusions and the number of valleys formed by them together with the stopper may be changed as appropriate.

  In the above-described embodiment, the water stop performance is secured by the first valley 32 formed in the “shallow” and “wide” groove shape, and the second valley 34 formed in the “deep” and “narrow” groove shape. Although it is not necessary to be limited to this, it is not necessarily limited to this, and it ensures water stoppage performance by “shallow” valleys, and it also prevents omission performance by “deep” (and “large difference in height”) valleys. If secured, the width of each valley can be appropriately changed.

  Furthermore, in the above-described embodiment, the annular protrusions 22, 24, and 26 are formed so that the height positions of the outer peripheral ends thereof are aligned, but it is not necessary to be limited to this.

  That is, since the height positions of the outer peripheral ends of the annular protrusions 22, 24, 26 are aligned, the “shallow” valley becomes a “valley with a small height difference”, and the “deep” valley has a “valley with a large height difference” However, the present invention is not limited to this, and the height positions of the outer peripheral ends of the valleys may be different from each other. In this case, the “shallow” valley whose depth is set to be smaller than the thickness of the synthetic resin pipe 14 ensures the water-stopping performance, and the valley formed in the groove shape with the “high difference in height” provides the anti-dropping performance. Make sure to secure.

  Further, in the above-described embodiment, the “shallow” first valley 32 whose depth is set smaller than the thickness of the synthetic resin tube 14 is the most distal end of the first connecting portion 18 among the plurality of valleys 32, 34, 36. The valley 34 is formed on the back side, and the depth thereof is set smaller than the thickness of the synthetic resin pipe 14 (and “the difference in height is large”). It is not necessary to be limited to the above, and the arrangement position of each valley may be appropriately changed as long as water stoppage can be ensured.

  In the above-described embodiment, when one end surface of the ring member 16 contacts the stopper 30, the axial position of the other end surface is aligned with the axial position of the vertical surface 22b of the first annular protrusion 22. However, the present invention is not limited to this, and the other end surface of the ring member 16 may be positioned on the front side of the vertical surface 22b of the first annular protrusion 22. In this case, when a bending force is applied to the synthetic resin tube 14 from the outside, the burden on the joint portion with the main body 14 can be reduced. Therefore, there is a problem such as tearing of the synthetic resin tube 14 at the joint portion. It becomes difficult to occur.

  Furthermore, in the above-described embodiment, each annular protrusion 22, 24, 26 protrudes from the first connecting portion 18 so that its longitudinal section (circumferential section) is substantially trapezoidal. Then, by forming all the front side surfaces of the annular projections 22, 24, 26 as inclined surfaces 22a, 24a, 26a, the synthetic resin tube 14 is “forcedly inserted” on the outer peripheral surface of the first connecting portion 18 of the main body 12. "It is easy to make it easy to make it easier to lock the resin of the synthetic resin tube 14 to the valley by forming all the back side surfaces as vertical surfaces 22b, 24b, 26b, but it is not necessary to be limited to this. .

  Further, although not shown, the outer peripheral end surfaces (tip surfaces) of the annular protrusions 22, 24, 26 are knurled to form the outer peripheral end surfaces of the annular protrusions 22, 24, 26 as rough surfaces. It may be. In this case, it is possible to further improve the slip prevention performance and torque resistance performance of the synthetic resin tube 14 with respect to the first connection portion 18 of the main body 12.

  Moreover, in the above-mentioned Example, the 2nd connection part 20 which has an insertion structure is formed in the one end part of the main body 12, and this 2nd connection part 20 is a connection part with metal components (metal valve 100). The screw threadedly engages with the female thread portion 106 of the connection port 104, but it is not necessary to be limited to this.

  The second connecting portion (metal connecting portion) 20 of the main body 12 may have a receiving structure or a union-type receiving structure, and the structure is within the scope of the present invention. It can be changed as appropriate.

  For example, in the conversion joint 10 according to another embodiment of the present invention shown in FIG. 11, a receiving structure is employed as a connection portion with a metal part. Hereinafter, the parts other than the second connection part 20 are the same as those of the conversion joint 10 of the embodiment of FIG.

  As shown in FIGS. 12A and 12B, the main body 12 includes a first connection portion 18 formed in a short tube having a predetermined diameter, and a stopper 30 is provided at one end portion of the first connection portion 18. A receiving port (second connecting portion) 46 is formed with a gap therebetween. The receiving port 46 is continuously formed from the stopper 30 so that the first connecting portion 18 and the internal space communicate with each other, and an internal thread portion 48 that is screwed with a metal part is formed on the inner surface thereof.

  Further, for example, in the conversion joint 10 according to another embodiment of the present invention shown in FIG. 13, a union type receiving structure is adopted as a connection portion with a metal part. Hereinafter, the parts other than the second connection part 20 are the same as those of the conversion joint 10 of the embodiment of FIG.

  As shown in FIGS. 14A and 14B, the main body 12 includes a first connection portion 18 formed in a short tubular shape having a predetermined diameter, and a stopper 30 is provided at one end portion of the first connection portion 18. A union type receiving port (second connecting portion) 50 is formed with a gap therebetween. The union type receiving port 50 includes a shaft portion 52 formed continuously from the stopper 30, and the receiving portion 54 is fitted on the outer peripheral surface of the shaft portion 52 so as to be movable in the axial direction. On the inner surface of the receiving portion 54, a female screw portion 56 that is screwed with a male screw portion of a metal part is formed.

  Note that the specific numerical values such as the diameter and height described above are merely examples, and can be appropriately changed as necessary. In addition, “equal” in this embodiment is a concept that includes not only a state of being aligned on the same axis in a strict sense but also a state of being approximately aligned.

DESCRIPTION OF SYMBOLS 10 ... Conversion joint 12 ... Main body 14 ... Synthetic resin pipe 16 ... Ring member 18 ... 1st connection part 20 ... 2nd connection part 22, 24, 26 ... Annular protrusion 30 ... Stopper 32, 34, 36 ... Valley

Claims (7)

A main body made of metal and having a cylindrical resin pipe connection portion,
A plurality of annular protrusions that are formed to protrude from the outer peripheral surface of the resin pipe connecting portion and are arranged in the axial direction of the resin pipe connecting portion;
A stopper formed to protrude from the outer peripheral surface of the main body on the back side in the axial direction from the resin pipe connecting portion,
A first valley having a first depth and a second valley having a deeper second depth formed between adjacent annular projections and between the stopper and the adjacent annular projection; Multiple valleys, including
A synthetic resin pipe having an inner diameter smaller than the outer diameter of the annular protrusion and fitted on the outer peripheral surface of the resin pipe connecting portion and having one end abutting against the stopper; and fitted on the outer peripheral surface of the synthetic resin pipe And a conversion joint comprising a ring member that crimps the inner peripheral surface of the synthetic resin pipe to the plurality of annular protrusions.   The conversion coupling according to claim 1, wherein the second valley is formed on the inner side in the axial direction from the first valley.   The inner diameter of the ring member is such that the distance between the inner peripheral surface of the ring member and the bottom of the first valley is smaller than the thickness of the synthetic resin tube, and the inner peripheral surface of the ring member and the second The conversion coupling according to claim 1 or 2, wherein the distance between the bottom of the valley is set to be larger than the thickness of the synthetic resin pipe.   The conversion joint according to any one of claims 1 to 3, wherein a resin escape portion that forms a space between the stopper and the stopper is formed at an axially inner end of the inner peripheral surface of the ring member. . The first valley is formed adjacent to the back side of the first annular protrusion formed on the most distal side on the outer peripheral surface of the resin pipe connecting portion among the plurality of annular protrusions,
5. The height difference between the first annular protrusion and the first valley is set to be smaller than the height difference between another annular protrusion and another valley adjacent to the back side thereof. The conversion joint in any one of. The plurality of annular protrusions include a first annular protrusion formed on the most distal end side on the outer peripheral surface of the resin pipe connecting portion,
A first chamfered portion having a chamfered corner is formed at the outer peripheral end on the back side in the axial direction of the first annular protrusion,
The conversion joint according to any one of claims 1 to 5, wherein a second chamfered portion having a chamfered corner is formed at an inner peripheral end of the other end of the ring member.   The conversion joint according to any one of claims 1 to 6, wherein a length of the first valley in the axial direction is set larger than a length of the second valley in the axial direction.

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