JP2010060071A - Branching joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branching joint which can branch a fluid such as gas from a resin made main pipe and can keep a bored opening in an opened state without blocking up the opening part with surely holding a hole saw after completion of boring. <P>SOLUTION: The branching joint 1 includes a joint body 2 comprising a saddle part 21 which is firmly fixed on the outer peripheral part of the resin made main pipe, a cylindrical boring pipe part 22 provided to protrude from the saddle part and a cylindrical branching part pipe joint section 23 which communicates with the boring pipe part and to which the fluid branched from the main pipe is sent, a boring cutter 3 mounted in the inner diameter side of the boring pipe part to cut the main pipe and an annular retaining member 5 engaged with at least one of the boring pipe part and the boring cutter to retain the boring cutter in the boring pipe member. When the boring cutter 3 is retained by the boring pipe part 22, a flow channel allowing communication between the inside and outside of the boring pipe part separated by the boring cutter is formed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resin branch extraction joint that takes out and pipes a branch pipe without leaking fluid from an existing resin main pipe such as polyethylene through which a fluid such as gas flows.

  Conventionally, polyethylene pipes that are lighter and have better earthquake resistance than cast iron pipes have been used for buried pipes for gas and water distribution. There is one described in Patent Document 1 as a branch joint for branching a fluid such as a gas from an existing resin main pipe. This branch joint is composed of a saddle portion that is fused to a resin pipe, a first tube portion that houses a punch, and a second tube portion that communicates with the first tube portion. An internal thread is formed in the part over the entire length. The punching tool is composed of a male screw portion having a male screw formed on the outer peripheral portion and a cylindrical blade body provided so as to be relatively rotatable with respect to the male screw portion, and is screwed into the first tube portion. . According to this branch joint, a fluid such as a gas can be branched from the resin pipe by the following procedure. First, the saddle part is fused to the resin main pipe, and then the branch pipe is connected to the second cylinder part by, for example, an electric fusion joint (socket). Next, the cap having the rotational operation member inserted in a sealed and rotatable manner is screwed onto the outer peripheral male screw portion of the first tube portion and attached. At this time, the end of the rotation operation member is connected to the punching tool so as to transmit the rotation to the punching tool. Next, by rotating the rotary operation member, the punch is fed toward the resin main pipe by the lead of the screw. Since the blade body is provided so as to be relatively rotatable with respect to the male threaded portion, after the blade body abuts on the resin tube, the blade body moves only in the direction of the central axis of the first tube portion and moves the resin tube. The resin tube is perforated by shear deformation. When the drilling is completed, the punching tool is pulled up to the upper end of the first tube part by rotating the rotary operation member in the reverse direction. Next, the cap is removed from the first tube portion, and a closing cap is attached to the first tube portion. As described above, in the branch joint of this structure, the resin pipe can be drilled. However, since the reaction force of the blade body at the time of drilling must be received only by the resin female screw, the male screw portion and the female screw are used. Since the length of the portion inevitably increases, the size of the first tube portion and thus the entire branch joint increases. Also, in order to reduce the operating torque, it is necessary to reduce the screw pitch of the female female screw. However, the screw diameter is increased because the bore diameter is large especially in the case of a large diameter, and the pitch is also reduced to ensure the screw strength. There was a problem that the operating torque was not reduced because it was not possible.

  In order to solve these problems, Cited Document 2 discloses a cylindrical perforated tube portion without a screw on the inner surface, a forsor inserted and mounted on the inner diameter side of the perforated tube portion, and an inner diameter of the perforated tube portion. A branch joint having a rubber ring mounted in a recessed groove provided on the side has been proposed. In this branch take-out joint, no screw is formed on the inner surface of the perforated pipe portion and the outer surface of the horusoe, and the hole saw has an annular concave groove formed on the outer diameter side thereof locked to the rubber ring, so that the perforated pipe portion Retained. In this branch joint, drilling is performed by pushing the horusoe toward the resin main pipe with a drilling tool separately attached to the drilling pipe part, and after drilling, the drilling tool is used until the annular groove is locked to the rubber ring. Horso is raised. In this way, since this branch take-out joint does not need to form a screw for drilling in the perforated pipe portion and the hole saw itself, the joint can be made compact. Further, by providing the drilling tool separately, the feed pitch of the hole saw at the time of drilling can be easily changed, and when the drilling torque is high, the torque can be reduced by reducing the feed pitch. In particular, since the drilling torque increases when the drilling diameter is large, this structure is effective in such a case.

Japanese Patent Laid-Open No. 5-177597 (FIGS. 1 and 2) Japanese Patent No. 3748143 (4th to 5th pages, FIG. 1 and FIG. 2)

  However, according to the branch take-out joint described in Patent Document 2, when the final closing cap is tightened and attached to the perforated pipe portion with the annular groove locked to the rubber ring after perforation, the cap and rubber There is a possibility that air is compressed between the rings and the horusoe is pushed down to release the holding of the horusoe.

  Therefore, the object of the present invention is to easily branch a fluid such as a gas from the resin main pipe, and hold the hole saw securely after the drilling is completed and open the drilled opening without closing it. It is to provide a branch extraction joint capable of maintaining the state.

In order to achieve the above object, the branch joint according to the present invention includes a saddle portion fixed to the outer peripheral portion of the resin main pipe, a cylindrical perforated pipe portion provided so as to protrude from the saddle portion, A joint main body having a cylindrical branch pipe connecting portion that communicates with the perforated pipe portion and to which a fluid branched from the main pipe is sent, and a perforation that is attached to the inner diameter side of the perforated pipe portion and perforates the main pipe A branch take-off joint comprising a cutter, and an annular holding member that is engaged with at least one of the perforated tube portion and the perforated cutter and holds the perforated cutter in the perforated tube portion, wherein the perforated cutter is the When being held by the perforated tube portion, a flow path is formed which communicates the inside and outside of the perforated tube portion separated by the perforating cutter.
This branch take-off joint is used when the end of the perforated pipe part is finally closed with a cap after the perforation operation is completed and the perforation cutter is pulled up to a predetermined position in the perforated pipe part and held in the perforated pipe part. In addition, the fluid existing in the space between the cap and the perforation cutter moves to the inside of the perforation tube portion through a flow path communicating between the inside and the outside of the perforation tube portion separated by the perforation cutter. Thereby, the communicating flow path acts so that the fluid in the space between the cap and the perforation cutter is not compressed and the pressure does not increase.

  In the branch joint according to the present invention, the flow path may be formed by at least one outer peripheral groove formed on the outer surface of the perforation cutter.

  In the branch joint according to the present invention, the flow path may be formed by at least one notch groove formed on a contact portion side of the holding member with the perforation cutter.

  Further, in the branch joint according to the present invention, the flow path is formed by two cutout grooves formed on the contact portion side of the holding member with the perforation cutter, and the cutout grooves are formed by the cutout grooves. It is preferable that the angle between the straight line connecting the center of the holding member and the holding member is 90 degrees.

  According to the present invention, the cylindrical perforated tube portion is held by the annular holding member, and the perforated tube portion and the perforated cutter itself need to have a screw for holding the perforated cutter and moving the perforated cutter. Therefore, a compact branch extraction joint can be obtained. Furthermore, according to the present invention, when the perforation cutter is held by the perforation tube portion, a flow path is formed to connect the inside and outside of the perforation tube portion separated by the perforation tube portion. Even if the cap is closed with a cap, the holding state of the cutter is not released and the open state of the branch hole can be reliably maintained.

(First embodiment)
FIG. 1 shows a half sectional view of a branch take-out joint according to the first embodiment of the present invention, FIG. 2 shows a plan view and a half sectional view showing a relationship between a perforation cutter and a holding member, and FIG. 3 shows this embodiment. 3 (a) shows a drilling process to the main pipe by the branch take-off joint according to the embodiment, FIG. 3 (a) is before drilling, FIG. 3 (b) is a drilling tool mounted, FIG. 3 (c) is in the middle of drilling, FIG. ) Shows each state after drilling.

  In the branch extraction joint 1, a saddle part 21 joined to a resin main pipe through which gas flows, a perforated pipe part 22 extended from the saddle part 21, and a branch pipe part 23 branched from the perforated pipe part 22 are integrated. The joint body 2 is formed, the perforation cutter 3 inserted into the perforated tube portion 22, and the closing cap 4 screwed into the end of the perforated tube portion 22.

  The saddle portion 21 is formed to have substantially the same curvature as the outer periphery of the resin main pipe P to be fused, and an opening 210 for taking out a branch is formed at the center thereof. A heating wire 211 that generates heat when energized is embedded in the inner surface on the side in contact with the resin main pipe P in a spiral shape around the opening 210. Connector pins 212 for energization are connected to both ends of the heating wire 211, and the connector pins are provided so as to protrude from the outer surface of the saddle portion 21. When a connector of an energization controller (not shown) is attached to the connector pin 212 and energized, the heating wire 211 generates heat, and the inner surface of the saddle portion 21 and the outer surface of the resin main pipe P are melted and fusion bonded.

  The perforated tube portion 22 protrudes outward from the saddle portion 21, and the inner diameter thereof is formed in a cylindrical shape having the same diameter as the perforated diameter perforated in the resin main tube P. On the inner diameter side of the perforated tube portion 22, a single annular groove 221 is formed at a predetermined position from the end, and a ring-shaped holding member 5 made of an elastic body such as rubber is attached to the annular groove 221. Yes. A male screw part 222 and an outer peripheral groove 223 are formed in this order from the end on the outer diameter side of the perforated pipe part 22, and the first closing O-ring 6 is attached to the outer peripheral groove 223.

  The branch pipe part 23 is branched from the perforated pipe part 22 in a direction parallel to the axis of the resin main pipe P, and is formed in a cylindrical shape having substantially the same inner and outer diameters as the perforated pipe part 22. A branch pipe (not shown) is connected to the branch pipe portion 23 by, for example, a socket-type electric fusion joint.

The perforating cutter 3 is a bottomed cylindrical metal member that is inserted into the perforated tube portion 22 and is open at one end, and has a blade portion that tapers toward the end at the open end. 31 is provided in a ring shape. The other end portion is provided with a daruma hole 32 composed of a large diameter portion 321 and a small diameter portion 322 so that a drilling tool described later can be connected thereto. Further, a groove portion 33 extending in the length direction of the perforation cutter is provided on the side surface of the body portion of the perforation cutter 3.
The piercing cutter 3 is inserted into the piercing tube portion 22 until its end surface is flush with the end surface of the piercing tube portion 22, and the barrel side surface is compressed by the holding member 5 and held in the piercing tube portion 22. Has been. At this time, the outer surface of the perforation cutter 3 is in close contact with the holding member 5 over the entire circumference, but the perforation cutter 3 and the holding member 5 are not in contact with each other in the groove 33 (see FIG. 2). In this way, a flow path is formed on the outer surface of the perforation cutter 3 so that the inside and outside of the perforation pipe portion communicate with each other.

Using this branch extraction joint 1, the gas is branched from the resin main pipe P in the following procedure.
(1) Branch take-off joint and branch pipe connection to resin main pipe (see Fig. 3 (a))
First, the branch extraction joint 1 is clamped to the outer peripheral portion of the branch extraction portion of the resin main pipe P. The branch extraction joint is fusion bonded to the resin main pipe P by energizing the heating wire with an energization controller (not shown) connected to the connector pin 212. Then, before perforating the resin main pipe P, a branch pipe (not shown) is connected to the branch pipe portion 23 in advance by, for example, a socket-type electric fusion joint (not shown), and a gas flow path to the branch pipe Form.

(2) Attaching the drilling tool (see Fig. 3 (b))
The end face of the perforating cutter 3 is exposed by removing the closing cap 4 attached to the end of the perforating pipe section 22. The end of the propulsion shaft 71 of the drilling tool 7 is inserted into the dart hole 32 at the end of the drilling cutter. At the end portion of the propulsion shaft 71, a locking collar portion 711 having a smaller diameter than the large diameter portion 321 of the round hole 32 and a stepped portion 712 having a larger diameter than the large diameter portion 321 of the round hole 32 are formed. The propulsion shaft 71 and the perforating cutter 3 are locked by the small diameter portion 322 and the collar portion 711 of the round hole 32 so as not to be disengaged in the axial direction. Then, the drilling tool 7 is mounted by screwing the nut 72 into the male screw part 222 at the end of the drilling pipe part 22.

(3) Resin main drilling (see Fig. 3 (c))
The propulsion shaft 71 is formed in a hexagonal shape so that a tool (not shown) such as a rotation handle is connected to the end portion, and a feed male screw portion 713 and a cylindrical body portion 714 are formed. The O-ring 8 is mounted between the body portion 714 and the nut 72, and the propulsion shaft 71 is slidably provided in a sealed state in the axial direction with respect to the nut 72. The propelling shaft 71 is slid until the tip of the perforation cutter 3 comes near the outer periphery of the resin main pipe P. Thereafter, the propulsion shaft 71 is screwed into the feed female screw portion 721 formed at the end of the nut by the feed male screw portion 713 and is screwed by the lead. The perforation cutter 3 attached to the end of the propulsion shaft 71 moves together with the propulsion shaft 71 and is pressed against the resin main pipe P, and the resin main pipe P is perforated by the blade portion 31 of the perforation cutter. The punched section 9 is press-fitted into the inner diameter side of the cylindrical punching cutter 3. When the section 9 is completely sheared and the drilling is completed, the propulsion shaft 71 is reversely rotated and retracted until the screwing of the feeding screws 713 and 721 is released, and the drilling cutter 3 is locked to the end of the propulsion shaft 71. Therefore, the propulsion shaft 71 moves backward as it moves backward. When the screwing of the feed screws 713 and 721 is released, the propulsion shaft 71 is pulled upward in the drawing until the end surface of the perforation cutter 3 comes to the same plane as the end surface of the perforation tube portion 22. At this time, the outer surface of the perforation cutter 3 is held in contact with the holding member 5 over almost the entire circumference.

(4) Closing the perforated pipe (see FIG. 3 (d))
As shown in FIG. 3D, the nut 72 of the drilling tool 7 is removed from the drilling pipe part, and the closing cap 4 is attached to the end of the drilling pipe part. The closing cap 4 is mounted by screwing the female screw portion 41 into the male screw portion 222 formed on the outer periphery of the end portion of the perforated tube portion 22. When the closing cap 4 is screwed, first, the cylindrical portion 42 formed on the inner diameter of the open end of the closing cap 4 is externally fitted to the first closing O-ring 6 mounted on the outer periphery of the perforated pipe portion and hermetically sealed. The Further, the closing cap 4 is screwed in until the second closing O-ring 10 mounted on the inner diameter back side comes into close contact with the end portion of the perforated tube portion 22, and the end portion of the perforated tube portion 22 is hermetically sealed. . In this way, the perforated tube portion 22 has a so-called double seal structure that is sealed by the first and second closed O-rings. If the closing cap 4 is tightened until it is fitted on the closing O-ring 6, the internal gas will not leak from the perforated tube portion 22.
Further, after the end portion of the closing cap 4 is sealed by the first closing O-ring 6, the first closing O-ring 10 is in contact with the end portion of the perforated pipe portion 22 until the second closing O-ring 10 comes into close contact therewith. The gas between the ring 6 and the perforation cutter 3 is compressed in the space with the movement of the closing cap 4, but according to the branch extraction joint 1 according to the first embodiment, the compressed gas is Since it moves to the inside of the perforation pipe part 22 through the flow path formed by the groove part 33 of the perforation cutter 3, the space between the first closed O-ring 6 and the perforation cutter 3 is pressurized so that the perforation cutter 3 It can be prevented from being pushed down from a predetermined holding position. Furthermore, it is possible to prevent the perforation cutter 3 from being dropped due to the release of the holding member 5.

(Second Embodiment)
FIG. 4 shows a half sectional view of a branch take-out joint according to the second embodiment of the present invention, and FIG. 5 shows a plan view and a half sectional view showing the relationship between the perforation cutter and the holding member. Note that the branch extraction joint according to the second embodiment is such that the flow path through which the inside and outside of the piercing pipe part separated from the piercing cutter communicates is formed by a notch groove formed in the holding member. Since it is the same as the branch extraction joint 1 shown in FIG. 1, the same parts are denoted by the same reference numerals and the description thereof is omitted.

The perforation cutter 3b is a bottomed cylindrical metal member that is inserted into the perforated tube portion 22 and is open at one end, and has a blade portion that tapers toward the end at the open end. 31 is provided in a ring shape. At the other end, a darling hole 32 is formed so that the drilling tool 7 can be connected. The outer peripheral side surface of the punching cutter 3b is formed in a cylindrical shape without a groove. The perforation cutter 3b is inserted into the perforation tube portion 22 until the end surface is flush with the end surface of the perforation tube portion 22, and the body side surface is compressed by a ring-shaped holding member 5b made of an elastic material such as rubber. And held in the perforated tube portion 22. At this time, the outer surface of the perforation cutter 3b is in close contact with the holding member 5b over almost the entire circumference, but a part in the circumferential direction is cut off on the inner ring side (the side in close contact with the outer surface of the perforation cutter) of the holding member 5b. A notch groove 51 is formed and does not contact the outer surface of the perforation cutter 3b on the notch groove (see FIG. 5B). In this way, a flow path is formed on the outer surface of the perforating cutter 3b so that the inside and outside of the perforating tube portion 22 communicate with each other.
As in the case of the branch take-out joint 1 of the first embodiment, the space between the first closing O-ring 6 and the punching cutter 3b when the closing cap 4 after drilling is mounted by this flow path. Since the gas inside moves to the inside of the perforated tube portion 22, it is possible to prevent the perforated cutter 3b from moving from the position held by the holding member 5b or falling.
Further, according to the branch joint according to the second embodiment, the holding member 5b having the notch groove 51 can be manufactured by injection molding or the like, so that it is made of metal as in the first embodiment. Rather than forming a groove on the outer surface of the perforation cutter by cutting, it is possible to easily form a flow path through which the inner and outer sides of the perforated pipe portion 22 communicate.

  In the branch joint shown in FIG. 4, the perforation cutter is held by one holding member that holds the side surface of the body portion, but may be held by a plurality of holding members to increase the holding force. it can. In addition, as shown in FIG. 6, the holding member 5 b ′ can be provided so that the blade portion 31 at the tip of the perforation cutter is locked. As shown in FIG. 7, the section 9 protrudes from the tip of the perforation cutter during drilling, and the burr 91 at the end of the section 9 may spread outside the perforation cutter. In such a case, FIG. As shown, if the holding member is provided at a position where the tip of the perforation cutter is locked, the notch groove on the inner ring side of the holding member may be compressed by the burr, and the flow path may be blocked. Therefore, when providing a holding member that engages the tip of the perforation cutter, it is desirable to form a plurality of cutout grooves on the inner ring side of the holding member. For example, if two cutout grooves are formed, it is desirable that the angle between the cutout grooves and the straight line connecting the centers of the holding members is 90 degrees as shown in FIG. By doing so, it is possible to prevent the flow path connecting the inside and outside of the perforated pipe section separated by the perforating cutter from being blocked by burrs. In addition, if this notch groove is too large, the amount of internal gas leakage will increase when the drilling tool is removed from the drilling tube part and a closing cap is attached after drilling. It is desirable that it is 15% or less of the thickness of the holding member in the normal direction of the holding member and within 5 mm in the tangential direction.

  As described above, in the branch joint according to the first and second embodiments, the perforation cutter and the holding member are formed with the flow path, but the present invention is not limited thereto, and the perforated pipe portion of the joint body It is also possible to form a groove in this and use it as a flow path.

It is a half sectional view of the branch extraction joint concerning a 1st embodiment of the present invention. It is the top view (Drawing 2-a) and half sectional view (Drawing 2-b) which show the relation between a perforation cutter and a holding member in a branch extraction joint concerning a 1st embodiment of the present invention. It is sectional drawing which shows the drilling process by the branch extraction coupling which concerns on the 1st Embodiment of this invention. It is a half sectional view of a branch extraction joint according to a second embodiment of the present invention. It is a top view (Drawing 5-a) and a half sectional view (Drawing 5-b) showing the relation between a perforation cutter and a holding member in a branch extraction joint concerning a 2nd embodiment of the present invention. It is sectional drawing which shows other arrangement | positioning of a perforation cutter and a holding member. It is sectional drawing which shows the cutter after perforation. It is a top view which shows the other form of a holding member.

Explanation of symbols

1: Branch extraction joint 2: Joint body 21: Saddle part, 22: Perforated pipe part, 221: Annular groove, 222: Male screw part, 223 outer peripheral groove, 23: Branch pipe part,
3, 3b: perforation cutter 31: blade portion, 32: daruma hole, 321: large diameter portion, 322: small diameter portion, 33: groove portion 4: cap for closing,
41: male screw part, 42: cylindrical part 5, 5b: holding member 51: notch groove 6: first closing O-ring 7: drilling tool 71: propulsion shaft, 711: collar part, 712: step part, 713: Male thread portion for feeding, 714: trunk portion 8: O-ring 9: section 91: burr 10: second closing O-ring P: resin main pipe

Claims (4)

A saddle portion fixed to the outer peripheral portion of the resin main pipe, a cylindrical perforated pipe section provided so as to protrude from the saddle section, and a fluid branched from the main pipe communicating with the perforated pipe section. A joint body having a cylindrical branch pipe connecting portion;
A perforation cutter mounted on the inner diameter side of the perforated pipe portion and perforating the main pipe;
A branch take-off joint provided with at least one of the perforated pipe part and the perforated cutter, and provided with an annular holding member that holds the perforated cutter in the perforated pipe part,
A branch extraction joint, wherein when the perforation cutter is held by the perforation tube portion, a flow path is formed in which the inside and outside of the perforation tube portion separated by the perforation cutter communicate with each other. The branch extraction joint according to claim 1, wherein the flow path is formed by a groove formed on a side surface of the body portion of the perforation cutter. 2. The branch joint according to claim 1, wherein the flow path is formed by at least one notch groove formed on a side of the holding member that contacts the perforation cutter. The flow path is formed by two notch grooves formed on the side of the holding member that contacts the perforation cutter,
The branch extraction joint according to claim 3, wherein the notch groove is provided so that an angle between a straight line connecting each notch groove and the center of the holding member is 90 degrees.

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