JP2013100878A - Fusion inner and branch saddle joint using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fusion inner which has high versatility and enables to form a branch saddle joint causing no problem after fusion.SOLUTION: A fusion inner 10 is integrally formed on the rear surface of the saddle (102) of a branch saddle joint (100), and includes an inner body 12 and a heating wire 14 fixed on the surface of the inner body 12. A through-hole 16 is formed in the center of the inner body 12, and a plurality of projections 18 are spirally formed around the through-hole. The heating wire 14 is hooked on the projection 18 and spirally wound, and is disposed in a long elliptic ring shape in the axial direction of the inner body 12, and a heating wire 14 is added in an ivy form to the inside of the major axis-direction end of the ring part 14a of the heating wire. A margin region S short in the peripheral direction of the inner body 12 and long in the axial direction of the inner body 12 is formed between the through-hole 16 and the heating wire 14.

Description

  The present invention relates to a fusion inner and a branch saddle joint using the same, and more particularly to a fusion inner and a branch saddle joint using the same used for forming a branch saddle joint of an electric fusion type.

  An example of a conventional branched saddle joint using this type of fusion inner is disclosed in Patent Document 1. In Patent Document 1, a circular through hole corresponding to a branch hole of a branch saddle joint is formed in a synthetic resin sheet of an electrothermal mat (fused inner). Around the through hole, a spiral groove is formed in a circular spiral shape, and a heating wire is mounted in the spiral groove. Then, by setting the electric heating mat in the mold and injecting the molten resin, a branch saddle joint in which the branch pipe protrudes integrally on the upper surface of the saddle and the heating wire is embedded on the rear surface of the saddle is formed.

In addition, some branch saddle joints are used by attaching a water faucet to the branch hole of the saddle without forming a branch pipe on the upper surface of the saddle. For example, Patent Literature 2 discloses a water faucet with a fusion saddle in which a metallic water faucet is attached to a branch portion of a branch saddle joint (saddle). In Patent Document 2, the water faucet connection port rises from the peripheral edge of the branch hole of the saddle, and a metal insert member (metal adapter) is embedded in the upper part of the water faucet connection port. And a water stopper is screwed and fixed to this metal insert member.
Japanese Patent No. 3558360 [F16L 47/02] JP 2000-179777 [F16L 41/06]

  The fusion inner used to form the branch saddle joint is curved along the back surface of the saddle and is integrated with the saddle in that state, but the non-fused portion generated around the branch hole is hydraulic. Since the branch saddle joint may be separated from the main pipe after fusion or an accident such as water leakage may occur from the non-fused portion, the outer shape of the through-hole as in Patent Document 1 is likely to be affected. Generally, the heating wires are concentrically arranged along the line.

  However, when the fusion inner of Patent Document 1 is applied to a branch saddle joint of the type in which a water faucet is mounted as in Patent Document 2, the metal insert member and the branch hole approach each other near the top of the saddle tube. Therefore, if the metal insert member thermally expands / shrinks due to the heat of the heating wire when the branch saddle joint is attached to the main pipe, the metal insert member changes in size, and the metal insert member and the surrounding resin There is a possibility that a gap may be formed between the two or the outer dimensions may be changed. Furthermore, when the heating wire moves because the resin melts, the heating wire and the metal insert member come into contact with each other, which may cause a short circuit. This is applicable to a branch saddle joint with a water faucet. It is difficult to do.

  Therefore, in order to avoid such interference of the heating wire with the metal insert member, it is considered that the heating wires are arranged concentrically on the heating mat in the same manner while separating the distance between the through hole and the heating wire. In this case, however, the distance between the through hole and the heating wire is too long, so that an unfused portion is generated more than necessary around the branch hole.

  Therefore, a main object of the present invention is to provide a novel fused inner and a branched saddle joint using the same.

  Another object of the present invention is a fusion inner that can be applied to a branch saddle joint of a type that is equipped with a water faucet and that does not cause a defect after fusion, and a branch saddle joint using the same. Is to provide.

  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 fusion inner applicable to an electric fusion-type branch saddle joint in which a metal insert member is embedded in a branching portion, and is mounted on the inner body having a circular through hole and on the surface of the inner body And includes a heating wire disposed around the through hole, and when the metal insert member is embedded in the branch portion between the heating wire and the through hole, the inner wire is prevented from interfering with the metal insert member. A fused inner, characterized in that a margin region having a shape that is short in the circumferential direction of the main body and long in the axial direction of the inner main body is formed.

  In the first invention, the fusion inner (10) is integrated with the back surface of the saddle (102) to form the branch saddle joint (100). The inner body (12) and the heating wire (14) It has. The inner main body is a substantially rectangular plate-like body formed by synthetic resin injection molding or the like, and a through hole (16) having a substantially true circular shape in plan view is formed at the center thereof. A heating wire is a nichrome wire etc., for example, and is arrange | positioned around a through-hole. And the blank area | region (S) in which a heating wire is not arrange | positioned is formed between a through-hole and a heating wire. The margin area is set so that the distance between the through-hole and the heating wire in the axial direction of the inner body is larger than the distance between the through-hole and the heating wire in the circumferential direction of the inner body. Short and long in the axial direction of the inner body. Thereby, at the time of electric fusion bonding of the branch saddle joint to the main pipe (200), while maintaining a predetermined distance at which the heating wire does not interfere with the metal insert member (108) in the pipe top portion of the saddle, In the circumferential direction of the saddle, the heating wire and the branch hole (104) are not greatly separated from each other, and it is possible to prevent an unfused portion from being generated more than necessary around the branch hole.

  According to the first invention, it is possible to apply the fusion inner not only to the branch saddle joint in which the metal insert member is not embedded in the branch portion but also to the branch saddle joint in which the metal insert member is embedded in the branch portion. become.

  Moreover, the non-fused portion is not unnecessarily generated around the branch hole of the branch saddle joint, so that the branch saddle joint formed using the fused inner is separated from the main pipe after the fusion, Problems such as water leakage accidents due to incomplete fusion can be prevented.

  A second invention is dependent on the first invention, and the heating wire is arranged such that an outer edge thereof has an elliptical shape or an elliptical approximate shape that is long in the axial direction of the inner body.

  In the second invention, the heating wire (14) is arranged so that its outer edge becomes an elliptical shape or an elliptical approximate shape that is long in the axial direction of the inner body (12), for example, by being hooked on the protrusions (18, 22). Is done.

  The third invention is dependent on the second invention, and forms a ring portion by winding the heating wire in a spiral shape and arranging it in an elliptical shape or an elliptical approximate ring shape that is long in the axial direction of the inner body. The replenishment portion was formed by arranging the heating wires in a knot-like manner inside the end portion in the major axis direction of the ring portion.

  In the third invention, the heating wire (14) is wound in a spiral shape with the through hole (16) as a center, so that the ring having an elliptical shape or an elliptical shape that is long in the axial direction of the inner main body (12). It is arranged in a shape, which becomes the ring portion (14a) of the heating wire. Further, the heating wire is added in a confused manner inside the end of the ring portion in the long axis direction, and this is the supplemental portion (14b) of the heating wire.

  According to the third aspect of the present invention, when the fusion inner is fused to the back surface of the saddle to form the branch saddle joint, for example, the ring portion of the heating wire is positioned below the indicator so that the fused state is appropriately set. While making it possible to determine, the non-fused portion around the branch hole can be suppressed to an extremely small range. Therefore, it is possible to more surely prevent problems such as a deviation of the branched saddle joint from the main pipe after fusion and a water leak accident due to incomplete fusion.

  A fourth invention is dependent on any one of the first to third inventions, and a replenishment portion is formed inside the one end portion in the major axis direction of the ring portion. A support pin that is used as a starting point when the inner peripheral end of the heating wire is pulled out to the outside of the ring portion is provided inside the other end portion in the major axis direction of the heating wire, and the heating wire is wound around the support pin.

  In the fourth aspect of the invention, a replenishment portion (14b) in which heating wires are arranged in a knot shape and added is formed inside one end portion in the major axis direction of the ring portion (14a) of the heating wire (14). . Further, a support pin (24) that is used as a starting point when the inner peripheral end of the heating wire is pulled out to the outside of the ring portion is provided inside the other end portion in the major axis direction of the ring portion (14a). Then, a heating wire is wound around the support pin, and a supplementary portion is formed by the heating wire around the support pin.

  According to a fifth aspect of the present invention, there is provided a fusion inner applicable to an electrofusion type branch saddle joint having a circular branch hole and having a metal insert member embedded in a branch portion. When the metal insert member is embedded in the branch portion between the heating wire and the planned formation position of the branch hole, the metal insert is attached to the branch hole. A fusion inner, wherein a margin region having a shape that is short in the circumferential direction of the inner main body and long in the axial direction of the inner main body is formed so that the heating wire does not interfere with the member.

  In the fifth invention, the fusion inner (10) is integrated with the back surface of the saddle (102) to form the branch saddle joint (100). The inner main body (12) and the heating wire (14) It has. The inner main body is a substantially rectangular plate-like body formed by synthetic resin injection molding or the like. The heating wire is, for example, a nichrome wire, and is disposed around a predetermined position where the branch hole (104) of the branch saddle joint is formed. A blank area (S) in which no heating wire is disposed is formed between the planned formation position of the branch hole and the heating wire. The blank area is formed in a shape that is short in the circumferential direction of the inner body and long in the axial direction of the inner body. Thereby, at the time of electric fusion bonding of the branch saddle joint to the main pipe (200), while maintaining a predetermined distance at which the heating wire does not interfere with the metal insert member (108) in the pipe top portion of the saddle, In the circumferential direction of the saddle, the heating wire and the branch hole (104) are not greatly separated from each other, and it is possible to prevent an unfused portion from being generated more than necessary around the branch hole.

  According to the fifth aspect, the same effect as the first aspect is achieved.

  A sixth invention is a branch saddle joint in which the fusion inner of any one of the first to fifth inventions is integrally formed on the back surface of the saddle.

  In the sixth invention, the branch saddle joint (100) is, for example, a synthetic resin joint that is electrically fused and joined to the outer surface of the main pipe when the branch pipe is taken out from the main pipe. When the branch saddle joint is formed, the fusion inner (10) is integrally formed on the back surface of the saddle (102).

  According to the sixth aspect of the present invention, there are no problems such as separation from the main after fusing to the main and occurrence of a water leak accident due to incomplete fusing.

  According to this invention, since the marginal area of the shape that is short in the circumferential direction of the inner body and long in the axial direction of the inner body is formed between the through hole and the heating wire, the versatility of the fused inner is increased. In addition, after the branched saddle joint formed using the fused inner is fused to the main pipe, problems and the like are unlikely to occur.

  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 an illustration figure which shows the melt | fusion inner of one Example of this invention. It is a perspective view which shows the branch saddle joint shape | molded using the melt | fusion inner side of FIG. It is sectional drawing which shows the circumferential cross section of the branch saddle joint of FIG. It is sectional drawing which shows the axial direction cross section of the branch saddle joint of FIG. It is a top view which shows the melt | fusion inner of FIG. FIG. 2 is an illustrative view showing the inside of one end portion in the major axis direction of a ring portion of a heating wire in the fusion inner of FIG. 1. FIG. 2 is an illustrative view showing the inside of the other end portion in the major axis direction of the ring portion of the heating wire in the fusion inner of FIG. 1. It is a top view which shows the blank area | region formed in the melt | fusion inner side of FIG. It is an illustration figure which shows the principal part of the circumferential cross section of the branch saddle joint of FIG. It is an illustration figure which shows the principal part of the axial cross section of the branch saddle joint of FIG. (A) is a top view which shows the conventional fusion inner, (b) is an illustration figure which shows the cross section of the axial direction of the branch saddle joint shape | molded using the fusion inner of (a). It is an illustration figure which shows the fusion inner of another Example of this invention.

  Referring to FIG. 1, a fusion inner 10 according to an embodiment of the present invention is used to form an electric fusion-type branch saddle joint 100 as shown in FIG. And a heating wire 14 attached to the inner body 12.

  Here, prior to a specific description of the fusion inner 10, the branch saddle joint 100 will be described.

  Referring to FIGS. 2 to 4, the branch saddle joint 100 is made of a synthetic resin such as polyethylene that is electrofused to the outer surface of the main pipe 200 when the branch pipe is taken out from the main pipe 200 made of synthetic resin such as polyethylene. It is a joint made of metal and includes a saddle 102 in which a branch hole 104 is formed. The main pipe 200 is a water distribution pipe for water supply made of a synthetic resin such as polyethylene, and the pipe diameter is, for example, 90 mm.

  As shown in FIGS. 2 to 4, the saddle 102 is made of a synthetic resin, and is formed of polyethylene in this embodiment. The saddle 102 is a plate-like body having the same inner diameter curvature as the outer diameter curvature of the main pipe 200, and its axial length is, for example, 160 mm, and its thickness is, for example, 10 mm. However, the “axial direction” in this embodiment means the pipe axial direction of the main pipe 200 when the branch saddle joint 100 is attached to the main pipe 200, and the “circumferential direction” means the circumferential direction of the main pipe 200. Means.

  As shown in FIGS. 3 and 4, a branch hole 104 having a substantially circular shape in plan view is formed in the center portion of the saddle 102. Further, at the peripheral edge of the branch hole 104, a short tubular water faucet connection port (branch part) 106 extending from the branch hole 104 toward the radially outer side of the saddle 102 (that is, the upper side in FIGS. 3 and 4). Is formed.

  A metal insert member 108 is integrally embedded in the upper portion of the branch portion 106. The metal insert member 108 is made of metal such as gun metal, and is formed into a cylindrical shape by cutting with a lathe or the like. The metal insert member 108 includes a main body upper part 108a and a main body lower part 108b that are continuous in the vertical direction, and the main body lower part 108b is formed to have a smaller diameter than the main body upper part 108a. An internal thread 110 is formed on the inner peripheral surface of the main body upper portion 108 a of the metal insert member 108. Then, the male screw of the water faucet (not shown) is screwed onto the female screw 110, whereby the water faucet is fixed to the saddle 102 via the metal insert member 108.

  Further, a heating wire 112 (14) such as a nichrome wire is provided on the back surface of the saddle 102 (that is, the joint surface between the saddle 102 and the main pipe 200). As will be described in detail later, the heating wire 112 is wound around the branch hole 104 in a spiral shape, and both ends thereof are connected to the power connection terminal 114 formed to protrude from the surface of the saddle 102. Yes. An indicator 116 is formed on the center side of the power connection terminal 114 to indicate that the saddle 102 and the main pipe 200 are fused. The indicator 116 is raised by the pressure of the resin melted by the heating wire 112 acting on its own base, and is used as an indication that the saddle 102 and the main pipe 200 are correctly fused.

  Returning to the description of the fusion inner 10, with reference to FIGS. 1 and 5 to 8, the fusion inner 10 is formed by fusing (integrating) the back surface of the saddle 102 to form the branch saddle joint 100. As described above, the inner body 12 and the heating wire 14 attached to the inner body 12 are provided.

  Basically, the heating wire 14 is attached to the inner body 12 that is curved in an arc shape along the back surface of the saddle 102. However, for the sake of easy understanding, the flat inner body is shown in the drawing. Note that the fusion inner 10 with the heating wire 14 attached to 12 is shown.

  As shown in FIGS. 1 and 5, the inner main body 12 is a substantially rectangular plate-like body formed by injection molding of synthetic resin or the like, and is formed of polyethylene in this embodiment. A through hole 16 having a substantially circular shape in plan view is formed in the center of the inner body 12. The through hole 16 is formed corresponding to a position where the branch hole 104 is formed when the branch saddle joint 100 is formed. The length of the inner body 12 in the long side direction is, for example, 160 mm, the length in the short side direction is, for example, 100 mm, and the thickness thereof is, for example, 1 mm.

  When the branch saddle joint 100 is formed, the long side direction of the inner body 12 corresponds to the “axial direction” of the saddle 102 (main pipe 200), and the short side direction of the inner body 12 is the saddle 102 (main pipe 200). ) In the “circumferential direction”. Therefore, in the following description, the long side direction of the inner main body 12 is referred to as “axial direction”, and the short side direction of the inner main body 12 is referred to as “circumferential direction”.

  A plurality of protrusions 18 are provided on the surface of the inner main body 12 (that is, the joint surface with the back surface of the saddle 102). The protrusion 18 has a substantially truncated conical shape, for example, and is formed to protrude from the surface of the inner body 12 in the vertical direction. The height of the protrusion 18 is 3 mm, for example. The protrusions 18 are arranged side by side in a spiral shape with the through hole 16 as the center, and are distributed in a ring shape of an ellipse or an ellipse approximate shape (for example, a polygon approximated to an ellipse) that is long in the axial direction of the inner body 12 as a whole. The protrusion group 20 is configured.

  For example, in this embodiment, the projection group 20 includes ten projection groups 20a, 20b, 20c, 20d, 20e, 20f, in which the projections 18 are arranged in a row at regular intervals in the direction from the through hole 16 to the outside. 20g, 20h, 20i, 20j, the projection group 20a and the projection group 20g, the projection group 20b and the projection group 20f, the projection group 20c and the projection group 20h, the projection group 20d and the projection group 20i, The protrusion group 20e and the protrusion group 20j are arranged so as to be parallel to each other with the through hole 16 interposed therebetween. Hereinafter, when distinguishing the projection group 20 according to the arrangement position or the like, 20a to 20j with subscripts a to j added to 20 are used, and 20 is used to express these comprehensively.

  Moreover, the heating wire 14 is a nichrome wire etc., for example, and is arrange | positioned around the through-hole 16. FIG. The heating wire 14 is wound in a spiral shape while being hooked on each protrusion 18 of the protrusion group 20, and is in the shape of an ellipse that is long in the axial direction of the inner body 12 or an elliptical approximate shape (a shape that approximates an ellipse). The ring portion 14a of the heating wire 14 is arranged there.

  Further, on the surface of the inner body 12, a plurality (five in this embodiment) of protrusions 22 are provided inside one end portion in the major axis (major axis) direction of the ring portion 14 a of the heating wire 14. The heating wire 14 is hooked on the protrusions 22 and arranged in a knot shape (zigzag folded shape), which becomes a supplementary portion 14 b of the heating wire 14. Hereinafter, when distinguishing the protrusions 22 according to the arrangement position, etc., 22a to 22e with subscripts a to e added to 20 are used, and 22 is used when these are comprehensively expressed.

  Specifically, as shown in FIG. 6, the heating wire 14 wound spirally while being hooked on each protrusion 18 of the protrusion group 20 moves the protrusion 22a from the innermost protrusion 18 in the protrusion group 20h. Then, it extends toward the circumferential direction of the inner main body 12, and is hooked on the protrusion 22b before the protrusion group 20e and returned to the U shape. Then, after being wound in the original direction through the protrusion 22c, it is extended from the innermost protrusion 18 in the protrusion group 20f toward the circumferential direction of the inner body 12, and is hooked on the protrusion 22d before the protrusion 22c. Then, it is returned to the U-shape and is wound again in the original direction through the protrusion 22e. By doing so, a replenishment portion 14b in which the heating wires 14 are arranged in a knot shape is formed inside one end portion in the major axis direction of the ring portion 14a.

  1 and 5, a support pin 24 is provided on the inner side of the other end portion in the major axis direction of the ring portion 14a. And the heating wire 14 extended from the inner peripheral side end of the ring part 14a is wound around the support pin 24, and serves as a starting point for drawing the heating wire 14 to the outside of the projection group 20.

  Specifically, as shown in FIG. 7, on the surface of the inner main body 12, support pins (projections) 24 and 26 are respectively provided on the inner side and the outer side of the projection group 20. For example, each of the support pins 24 and 26 has a substantially truncated cone shape, for example, and is formed to protrude in the vertical direction from the surface of the inner body 12. One support pin (hereinafter, also referred to as “inner support pin”) 24 is provided inside the projection group 20 and in the vicinity of the projection 18 to which the inner peripheral end of the heating wire 14 is hooked. One support pin (hereinafter also referred to as “outer support pin”) 26 is provided on a straight line extending from the inner support pin 24 to the outside of the projection group 20. Then, the inner peripheral end of the ring portion 14a of the heating wire 14 is wound around the inner support pin 24 a plurality of times, and is pulled out to the outside of the projection group 20 across the ring portion 14a. Wound around multiple times. As a result, the starting point of the transverse portion 14c that crosses the ring portion 14a is provided inside the other end portion in the major axis direction of the ring portion 14a. In this embodiment, the heating wire around the inner support pin 24 is provided. 14 is used as a supplementary portion 14b of the heating wire 14.

  Returning to FIG. 1 and FIG. 5, at both ends in the axial direction of the inner body 12, for example, a start pin 28 and a terminal pin 30 are provided on a diagonal line of the inner body 12, respectively. The start pin 28 and the end pin 30 are portions for winding the start end and the end of the heating wire 14 when the heating wire 14 is attached to the inner body 12, and are formed to protrude from the surface of the inner body 12. .

  By arranging the heating wire 14 around the through hole 16 as described above, as shown in FIG. 6, there is a blank area S where the heating wire 14 is not arranged between the through hole 16 and the heating wire 14. It is formed. The blank area S is formed in a shape that is short in the circumferential direction of the inner main body 12 and long in the axial direction of the inner main body 12, and is longer than the distance a between the through hole 16 and the heating wire 14 in the axial direction of the inner main body 12. The distance b between the through hole 16 and the heating wire 14 in the circumferential direction is set to be small (that is, a> b).

  By the way, as shown in FIGS. 3 and 9, in the branch saddle joint 100 formed using such a fusion inner 10, the fusion inner 10 is fused (integrated) to the back surface of the saddle 102 as described above. ), The inner main body 12 is curved along the back surface of the saddle 102, whereby the heating wire 112 (14) and the metal insert member 108 are separated in the vertical direction in the circumferential direction of the saddle 102. . For this reason, the innermost portion of the heating wire 112 and the metal insert member 108 (the lower body portion 108b) are heated by the metal insert member 108 during the electric fusion bonding of the branch saddle joint 100 to the main pipe 200. It is possible to maintain a distance in an allowable range that does not cause the heat conduction exceeding the allowable value or the contact with the moved heating wire 14. That is, in the branched saddle joint 100 formed using the fusion inner 10 of the present embodiment, the heating wire 112 and the metal insert member 108 are separated in the vertical direction by curving the saddle 102, so that the circumferential direction of the saddle 102 is The shortest distance L between the heating wire 112 and the metal insert member 108 is equal to or greater than a predetermined distance at which the heating wire 112 does not interfere with the metal insert member 108.

  Here, for example, as shown in FIGS. 11A and 11B, the heating wire 14 is arranged in a circular shape or a circular approximate shape (for example, a polygonal shape approximated to a circular shape) around the through hole 16 of the inner body 12. In the branched saddle joint 100A of the type fitted with the water faucet formed using the fused inner 10A, the heating wire 112 (14) in the axial direction of the saddle 102, particularly at the top of the pipe of the saddle 102, etc. The distance between the innermost part of the metal insert member 108 and the metal insert member 108 (that is, the shortest distance between the heating wire 112 and the metal insert member 108) M1 is smaller than the predetermined distance, and the heating wire 112 is If the heating wire 112 is not positioned under the indicator 116 by being arranged close to the through hole 16 side, the indicator 116 may not function properly. High. Further, in order to improve this, if the heating wire 112 is arranged sufficiently away from the through hole 16, an unfused portion is generated more than necessary around the branch hole 104 in the circumferential direction of the saddle 102. Therefore, it causes a deviation from the main pipe 200 after the branch saddle joint 100 is fused, a water leak accident due to incomplete fusion, and the like.

  However, in the present embodiment, as described above, the margin region S that is short in the circumferential direction of the inner main body 12 and long in the axial direction of the inner main body 12 is formed between the through hole 16 and the heating wire 14. 4 and 10, the distance between the innermost part of the heating wire 112 and the metal insert member 108 in the axial direction of the saddle 102 (that is, the shortest distance between the heating wire 112 and the metal insert member 108). As shown in FIGS. 3 and 9, the heating wire 14 does not interfere with the metal insert member 108 so that M is equal to or larger than the predetermined distance, and also in the circumferential direction of the saddle 102 as shown in FIGS. The innermost part of the heating wire 112 is not separated from the branch hole 104 (that is, the innermost part of the heating wire 14 is connected to the through hole 16) more than necessary. Non-fusible portion unnecessarily around the 岐孔 104 can be prevented from occurring. For example, in the present embodiment, the shortest distance M between the heating wire 112 and the metal insert member 108 in the axial direction of the saddle 102 is substantially equal to the shortest distance L separated in the vertical direction by bending the saddle 102. The size (a, b) of the margin area S is set so that (that is, M≈L).

  In particular, in the branched saddle joint 100 of the present embodiment, as described above, the main body lower portion 108b of the metal insert member 108 is formed to have a smaller diameter than the main body upper portion 108a. In the direction and the circumferential direction, the heating wire 112 can be arranged on the inner side (branch hole 104 side) while maintaining the predetermined distance between the heating wire 112 and the metal insert member 108. Only a very small range of non-fused portion is generated around the branch hole 104.

  By doing so, in the branched saddle joint 100 formed using the fusion inner 10 of this embodiment, the heating wire 112 is prevented from interfering with the metal insert member 108 at the time of electric fusion bonding to the main pipe 200. However, it is possible to prevent an unfused portion from being generated more than necessary around the branch hole 104. The fusion inner 10 can be applied not only to the branch saddle joint in which the metal insert member 108 is embedded in the branch portion 106 but also to the branch saddle joint in which the metal insert member 108 is not embedded in the branch portion 106. It is.

  Further, in the branch saddle joint, the heating wire 14 must be arranged so as to be positioned below the indicator 116. However, in the case of the branch saddle joint in which the metal insert member 108 is embedded in the branch portion 106, the branch portion Since the outer diameter of 106 increases, the indicator 116 is provided at a position away from the branch hole 104 by that amount. Therefore, in order to reduce the non-fused portion around the branch hole 104, the heating wire 14 must be disposed over a wide area in the axial direction of the saddle 102. As a means for arranging the heating wire 14 in such a manner, a method of increasing the number of windings of the ring portion 14a of the heating wire 14 or a method of forming the ring portion 14a by winding the heating wire 14 while the ring portion 14a is formed. A method of arranging and adding the heating wire 14 so that the heating wire 14 is located on the outer side of the indicator 116 and the lower side of the indicator 116 may be employed.

  Furthermore, as a more preferable embodiment of the present invention, the heating wire 14 is arranged inside the ring portion 14 without increasing the number of windings of the ring portion 14a of the heating wire 14, so that the non-fused portion of the saddle 102 is reduced. It is desirable to position the ring portion 14a, which is the main portion of the heating wire 14, below the indicator 116 while keeping it within a small range. This is because the ring portion 14a, which is the main portion of the heating wire 14, is positioned below the indicator 116, so that the indicator 116 can respond to the fused state between the saddle 102 and the main pipe 200 more accurately. Because.

  Therefore, in this embodiment, as shown in FIGS. 1, 5, 6, and 7, the ring portion 14a of the heating wire 14 is formed and at the time of the electric fusion bonding of the branch saddle joint 100 to the main pipe 200. In the range where the heating wire 14 does not interfere with the metal insert member 108, the heating wire 14 is also arranged inside the end portion in the major axis direction of the ring portion 14a to form the supplementary portion 14b. That is, in this embodiment, the heating wire 14 is wound to form the ring portion 14a, and the replenishment portion 14b is formed on the inner side of the long-diameter end of the ring portion 14a. The ring portion 14a of the heating wire 14 is positioned so that the indicator 116 responds more accurately to the fused state between the saddle 102 and the main pipe 200, and the non-fused portion of the saddle 102 is suppressed to a very small range. Thus, the fusion performance in the axial direction of the saddle 102 is improved.

  With reference to FIG. 1, FIG. 5, FIG. 6 and FIG. 7, a method of manufacturing the fusion inner 10 of this embodiment will be described below.

  First, the shape of the inner body 12 is maintained by bending the inner body 12 along the back surface of the saddle 102 of the branch saddle joint 100 and attaching and fixing a fixing jig (not shown) in that state. To do.

  Then, the heating wire 14 is automatically mounted on the surface of the inner main body 12 using an automatic winding machine. In addition, the kind of automatic winding machine is not specifically limited, Since it is not the summary of this invention, the detail is abbreviate | omitted.

  When the heating wire 14 is mounted on the surface of the inner body 12, first, the heating wire 14 is wound around the start pin 28 a plurality of times, and the outermost portion of the projection group 20 e that becomes the winding start projection 18 through the guide pin 32. Hook on the outer protrusion 18. Then, the heating wire 14 is hooked on each protrusion 18 of the protrusion group 20 and wound in a spiral shape to form a ring portion 14a, and as described above, near the inner side of one end portion in the major axis direction of the ring portion 14a. The heating wires 14 are hooked on the protrusions 22 and arranged in a knot shape.

  Specifically, the heating wire 14 wound in a spiral shape is hooked on the protrusion 22a from the innermost protrusion 18 in the protrusion group 20h, and extends from the protrusion 22a toward the circumferential direction of the inner body 12, and the protrusion It is hooked on the protrusion 22b before the group 20e and returned to the U shape. And it hooks on the protrusion 22c, and extends again from there in the original winding direction. Then, it extends from the innermost protrusion 18 in the protrusion group 20f toward the circumferential direction of the inner body 12 through the innermost protrusion 18 and is hooked on the protrusion 22d before the protrusion 22c. Return to U-shape. And it hooks on the protrusion 22e, and extends again from there in the original winding direction.

  Subsequently, when the heating wire 14 reaches the innermost projection 18 of the projection group 20b that becomes the winding end projection 18, the heating wire 14 is extended toward the inner support pin 24 and wound around the inner support pin 24 a plurality of times. From there, the ring portion 14a is traversed and pulled out to the outside of the projection group 20, and wound around the outer support pin 26 a plurality of times. Then, the terminal pin 30 is wound around the guide pin 32 a plurality of times.

  In this way, when the heating wire 14 is mounted on the surface of the inner body 12, the tips of the protrusions 18 and 22 are heated and melted by a heater (not shown) such as a heater, and the protrusions 18 and 22 are melted. The heating wire 14 that is hooked on the wire is locked so as not to come off, and the manufacturing operation of the fusion inner 10 is completed.

  Next, a method of manufacturing the branched saddle joint 100 as shown in FIG. 2 using such a fused inner 10 will be described below.

  First, the fusion inner 10 is placed on the lower mold with the surface of the inner body 12 facing up, and a metal cylinder or the like is inserted and fixed in the through hole 16 of the inner body 12. Close the upper mold. At this time, the power connection terminal 114 is attached to the heating wire 14 between one guide pin 32 and the start end pin 28 of the inner main body 12, and the power connection terminal is also connected between the other guide pin 32 and the termination pin 30. 114 is attached.

  Then, a molten resin such as polyethylene is injected into the mold, the molten resin is filled into the mold, and the fusion inner 10 and the molten resin are integrally fusion bonded. When the mold is opened after the molten resin is solidified, the branched saddle joint 100 in which the fusion inner 10 is integrally formed on the back surface of the saddle 102 is obtained.

  As described above, in this embodiment, the blank area S having a shape that is short in the circumferential direction of the inner main body 12 and long in the axial direction of the inner main body 12 is formed between the heating wire 14 and the through hole 16. Therefore, the heating wire 14 does not interfere with the metal insert member 108 even at the tube top portion of the saddle 102 where the heating wire 14 easily interferes with the metal insert member 108 at the time of electrical fusion bonding of the branch saddle joint 100 to the main pipe 200. While maintaining a predetermined distance, in the circumferential direction of the saddle 102, the heating wire 112 and the branch hole 104 are not greatly separated from each other, and an unfused portion is generated around the branch hole 104 more than necessary. Can be prevented.

  That is, an unfused portion is generated more than necessary around the branch hole 104 while avoiding the heating wire 14 from interfering with the metal insert member 108 at the time of electric fusion bonding of the branch saddle joint 100 to the main pipe 200. Therefore, not only the branch saddle joint in which the metal insert member 108 is not embedded in the branch portion 106, such as a type in which the branch pipe formed of the same resin material as the saddle rises from the branch portion, is used. It is also possible to apply to the formation of a branch saddle joint in which the metal insert member 108 is embedded in the branch portion 106 as described in Patent Document 2 (that is, a branch saddle joint of a type in which a water faucet is attached). become. Therefore, the fusion inner 10 is excellent in versatility.

  In addition, since no non-fused portion is generated around the branch hole 104 more than necessary, the branch saddle joint 100 after the fusion is separated from the main pipe 200 or a water leakage accident due to incomplete fusion. It becomes possible to avoid problems such as these. Therefore, no trouble occurs after the branch saddle joint 100 molded using the fused inner 10 is fused to the main pipe 200.

  Further, in this embodiment, in the range where the heating wire 14 does not interfere with the metal insert member 108 at the time of the electric fusion bonding of the branch saddle joint 100 to the main pipe 200, the end portion of the ring portion 14a of the heating wire 14 in the major axis direction. The heating wire 14 is also arranged on the inner side and added to form a supplementary portion 14b. Therefore, when the fusion inner 10 is fused to the back surface of the saddle 102 and the branch saddle joint 100 is formed, for example, the ring portion 14a of the heating wire 14 is positioned below the indicator 116, and the branch hole 104 It is possible to improve the fusing performance in the axial direction of the saddle 102 by suppressing the surrounding non-fused portion to a very small range. Accordingly, it is possible to more surely prevent the deviation of the branched saddle joint 100 after the fusion from the main pipe 200 and a water leak accident due to incomplete fusion.

  In the above description, the ring portion 14a of the heating wire 14 has been described as being arranged in an elliptical shape or an elliptical approximate ring shape that is long in the axial direction of the inner main body 12. The `` elliptical approximate ring shape '' means that the outer edge of the ring is formed in an elliptical shape or an elliptical approximate shape within the scope not changing the gist of the invention, and the inner body is short in the circumferential direction of the inner body. It shows a shape in which a long empty space (margin region S) is formed in the axial direction, and the ring width is not constant, or the outer edge is a flat oval shape such as an oval shape or a regular polygon shape approximating an oval shape Note that the intent is to encompass what is

  Moreover, in the above-mentioned Example, although the nichrome wire was used as the heating wire 14, it does not need to be limited to this. For example, the heating wire 14 may be a general resistance wire such as copper, iron chrome, chromel, copper nickel, copper manganese nickel, or the like.

  Further, in the above-described embodiment, the protrusions 18 are arranged in a spiral shape with the through hole 16 as a center, and around the through hole 16 of the inner body 12, ten protrusion groups 20 a to 20 j are formed as a whole on the inner body 12. Although it is distributed in the shape of an ellipse or an ellipse-like ring that is long in the axial direction, it need not be limited to this. If the ring portion 14a of the heating wire 14 can be arranged so as to have an elliptical shape or an elliptical approximate shape that is long in the axial direction of the inner main body 12, the heating wire 14 does not necessarily have to be spirally wound, and the distribution of the protrusions 18 is not necessarily required. The shape and the arrangement shape of the heating wire 14 can be appropriately changed.

  Furthermore, the protrusion 22 is provided on the inner side of the end portion in the major axis direction of the ring portion 14a, and the heating wire 14 hooked on the protrusion 22 is arranged in a knot shape. However, the present invention is not limited to this. If the heating wire 14 is arranged on the inner side of the end portion in the major axis direction of the ring portion 14a and the non-fused portion can be eliminated or suppressed to a very small range, the heating wire 14 needs to be arranged in a knot shape. Rather, the distribution shape of the protrusions 22 and the arrangement shape of the heating wire 14 on the inner side of the end portion in the major axis direction of the ring portion 14a can be appropriately changed.

  As an example, as shown in FIG. 12, the ring portion 14a and the replenishment portion 14b may be formed by arranging the heating wire 14 in a confusing manner while being hooked on the protrusion 34 on the surface of the inner body 12. Good. However, in this case, it is necessary to determine the distribution shape of the protrusions 34 so that the heating wire 14 can be drawn with one stroke.

  Moreover, in the above-mentioned Example, the inner side support pin 24 is provided inside the other end part of the major axis direction of the ring part 14a of the heating wire 14, The heating wire 14 is wound around the inner side support pin 24, and the ring part 14a is crossed. The starting point of the crossing portion 14c is formed and used as the supplementary portion 14b of the heating wire 14, but it need not be limited to this. The heating wire 14 may be arranged in a knot shape inside each end in the major axis direction of the ring portion 14a of the heating wire 14, and the inner support pin 24 may be provided in the other portion.

  Furthermore, in the above-described embodiment, the protrusions 18 and 22 are formed in a substantially truncated cone shape, but it is not necessary to be limited to this. For example, the protrusions 18 and 22 may be formed in a columnar shape, may be formed in a quadrangular prism shape, or may be formed in a shape that increases in diameter toward the tip. In short, the shape of the protrusions 18 and 22 can be appropriately changed as long as the heating wire 14 can be hooked and disposed on the protrusions 18 and 22.

  Furthermore, it is not always necessary to place the heating wire 14 by hooking on the protrusions 18, 22, and 34 provided on the surface of the inner body 12, and a groove is provided on the surface of the inner body 12, and along the groove. You may make it arrange | position the heating wire 14. FIG.

  Further, in the above-described embodiment, the inner body 12 is formed with the through hole 16 corresponding to the branch hole 104 of the branch saddle joint 100, and the heating wire 14 is disposed around the through hole 16. Although it has been arranged in the shape of an ellipse that is long in the direction or an elliptical approximate shape, it need not be limited to this.

  For example, although not shown, the heating wire 14 is disposed around the position corresponding to the branch hole 104 of the saddle 102, that is, around the position where the branch hole 104 is to be formed, with respect to the inner body 12 in which the through hole 16 is not formed. The inner main body 12 may be arranged in an elliptical shape or an elliptical approximate ring shape in the axial direction. Then, the through hole 16 may be formed in the inner main body 12 by machining, or after the fusion inner 10 is integrally formed on the back surface of the saddle 102, the saddle 102 including the inner main body 12 is formed in the saddle 102. The branch hole 104 may be formed by machining.

  Note that the specific numerical values such as the diameter and height described above are merely examples, and can be appropriately changed as necessary.

DESCRIPTION OF SYMBOLS 10 ... Fusion inner 12 ... Inner main body 14,112 ... Heating wire 14a ... Ring part 14b ... Replenishment part 16 ... Through-hole 18, 22, 34 ... Protrusion 24 ... Inner support pin 26 ... Outer support pin 100 ... Branch saddle joint 102 ... saddle 104 ... branch hole 106 ... branch portion 108 ... metal insert member 108a ... main body upper part 108b ... main body lower part 116 ... indicator S ... margin area

Claims (6)

In a fusion inner that can be applied to an electric fusion-type branch saddle joint in which a metal insert member is embedded in the branch portion,
An inner body having a circular through-hole, and a heating wire mounted on the surface of the inner body and disposed around the through-hole,
When the metal insert member is embedded in the branch portion between the heating wire and the through hole, the shaft of the inner body is short in the circumferential direction of the inner body so that the heating wire does not interfere with the metal insert member. A fusion inner, wherein a margin region having a long shape is formed in a direction.   The fusion inner according to claim 1, wherein the heating wire is arranged so that an outer edge thereof has an elliptical shape or an elliptical approximate shape that is long in an axial direction of the inner body.   The heating wire is spirally wound and arranged in an elliptical or elliptical ring shape that is long in the axial direction of the inner main body to form a ring portion, and at the end of the long axial direction of the ring portion The fused inner according to claim 2, wherein a replenishment portion is formed by arranging the heating wires in a knot shape inside.   The replenishment portion is formed inside one end portion in the long axis direction of the ring portion, and the inner peripheral end of the heating wire is connected to the ring portion inside the other end portion in the long axis direction of the ring portion. The fusion inner according to any one of claims 1 to 3, wherein a support pin is provided as a starting point when being drawn out to the outside of the wire, and the heating wire is wound around the support pin. In a fusion inner applicable to an electric fusion type branch saddle joint having a circular branch hole and having a metal insert member embedded in a branch part,
An inner body, and a heating wire mounted on a surface of the inner body and disposed around a position where the branch hole is to be formed;
When the metal insert member is embedded in the branch portion between the heating wire and the position where the branch hole is to be formed, the inner heating body is shortened in the circumferential direction so that the heating wire does not interfere with the metal insert member. A fusion inner, characterized in that a long margin area is formed in the axial direction of the inner body.   A branched saddle joint, wherein the fusion inner according to any one of claims 1 to 5 is integrally formed on a back surface of the saddle.

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