JP2006029365A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint in which a tightening band and a cylindrical body with an unconnected portion don't turn relatively to each other when the tightening band is tightened to shorten a diameter of the cylindrical body with the unconnected portion and therefore no displacement occurs and the cylindrical body with the unconnected portion can be uniformly shortened in diameter to realize high connection reliability and whose suitable application is possible to connection of water/hot water supply lines or the like using pipes made from such plastic or the like as cross-linked polyethylene, polybutene or the like. <P>SOLUTION: The pipe joint comprises a pipe inserting portion inserted into a pipe connected, the cylindrical body, with an unconnected portion, which is provided outside the pipe inserting portion and along an axial direction of the cylindrical body includes the unconnected portion that is shortened in diameter at the time of being tightened from its peripheral surface, and the tightening band which is provided outside the cylindrical body with the unconnected portion and tightens both ends of a strip-like body with a bolt and a nut. There is provided a protrusion in the tightening band, while a cutout is provided in the cylindrical body with the unconnected portion. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pipe joint used for a flexible synthetic resin pipe such as a crosslinked polyethylene pipe or a polybutene pipe.

  Conventionally, one of the pipe joints that connect synthetic resin pipes has a split ring shape that reduces the diameter when the wall of the cylindrical body is axially cracked and compressed from the outer peripheral surface to the outer peripheral surface of the pipe insertion portion. A tightening band in which a cylindrical body with a split portion is provided, and both ends of the strip-shaped main body wound in a cylindrical shape are flanged on the outside of the cylindrical body with a split portion, and the band-shaped main body is reduced in diameter by bringing the flanges close to each other The cylinder with the split part is reduced in diameter by tightening the flanges with bolts or the like to reduce the diameter of the fastening band, and the cylinder with the split part is inserted into the pipe insertion part of the pipe joint There is a pipe joint having a structure in which water is stopped by bringing a pipe into close contact with a pipe insertion portion.

  For example, in the pipe joint of this embodiment, a split ring-shaped outer cylinder member 44 having a protrusion 441 on the inner periphery is fitted on the outer periphery of the first connection portion 41 and the second connection portion 42. Further, a split ring-shaped fastening member 46 that can be reduced in diameter by a bolt 45 is fitted to the outer periphery of the outer cylinder member 44. Accordingly, when the forward pipe 2 is connected to the first connecting portion 41. As shown in FIG. 2, after fitting the end of the forward tube 2 between the first connecting portion 41 and the outer cylinder member 44, the bolt 45 is tightened to reduce the diameter of the fastening member 46. Thus, the end portion of the forward tube 2 can be attached by the first connecting portion 41 and the outer cylinder member 44 (see, for example, Patent Document 1).

This pipe joint is a pipe joint that allows two pipes to be connected in parallel. When connecting a pipe to be connected, the fastening member is reduced in diameter by tightening a bolt and provided on the inner periphery of the fastening member. The projecting ridges reduce the diameter of the outer cylinder member, and the outer cylinder member and the pipe connection portion sandwich and fasten the connected pipe such as a cross-linked polyethylene pipe inserted into the pipe connection portion. Is to demonstrate. According to this pipe joint, since the cross-linked polyethylene pipe is permanently pressed against the pipe connecting portion, it is said that high joining reliability can be realized.
JP-A-6-42686, paragraph number 0014, FIG. 1 and FIG.

  In the pipe joint having the above-described structure, the connected pipe can be reliably inserted into the pipe insertion portion in the vicinity of the pipe insertion back portion of the outer cylinder member (corresponding to the cylindrical body with a split portion of the present invention). A notch portion for confirming whether or not the tube has been inserted is provided. The notch portion for tube insertion confirmation may also be used as a split portion of an outer cylinder member having a split ring shape.

  On the other hand, the tightening member (corresponding to the tightening band of the present invention) has a split ring shape and is only loosely fitted on the outer side of the outer cylinder member. The member was easily rotated and misaligned. When the misalignment occurs, the split part of the outer cylinder member or the notch part for confirming the tube insertion may be in a position where it cannot be seen depending on the posture of the tightening work, and the tightening condition cannot be visually confirmed. There is a problem that insufficient tightening occurs and water leaks, and there is a problem that high connection reliability cannot be obtained.

  If the split part of the outer cylinder member moves to a position opposite to the position of the bolt or the like, a large torque is required to reduce the diameter of the pipe to be connected. There was also a problem that it was necessary to increase the force.

  When the fastening band is tightened to reduce the diameter of the cylinder with the split part, the fastening band and the cylindrical part with the split part do not rotate with each other, and therefore the cylinder with the split part is surely prevented from causing positional displacement. It was made for the purpose of providing a pipe joint that can be uniformly reduced in diameter, has high connection reliability, and is suitably used for connection of water supply and hot water supply pipes using synthetic resin pipes such as cross-linked polyethylene and polybutene. is there.

  A pipe joint according to a first aspect of the present invention (invention 1) includes a pipe insertion portion to be inserted into a pipe body to be connected (hereinafter referred to as a connected pipe), a cylindrical portion provided outside the pipe insertion portion, A cylindrical body with a split part which has a split part along the axial direction of the main body and which is reduced in diameter when tightened from the outer peripheral surface, and is provided on the outer side of the cylindrical body with the split part. And a tightening band that is tightened by a nut, wherein the tightening band is provided with a protrusion, and the cylindrical body with a split portion is provided with a notch.

  The pipe joint according to claim 2 (invention 2) has a pipe insertion part to be inserted into the connected pipe, and a split part that is provided outside the pipe insertion part and extends along the axial direction of the cylindrical main body. A cylinder with a split part, comprising a cylindrical body with a split part that is reduced in diameter when compressed from the outer peripheral surface, and a tightening band that is provided outside the cylindrical body with the split part and tightens both ends of the belt-like body with bolts and nuts. The body is provided with a protrusion, and the fastening band is provided with a notch.

  Examples of the pipe to be connected to which the pipe joint of the invention 1 or 2 is applied include a cross-linked polyethylene pipe, a polybutene pipe, a polyethylene pipe, a double-layer pipe of polyethylene and cross-linked polyethylene, and a vinyl chloride resin pipe. The synthetic resin tube may be a composite tube in which a metal material such as aluminum is used in combination on the tube wall.

  The pipe insertion part of the pipe joint of the invention 1 or 2 is a general one in which a protruding line protrudes in a circumferential shape in a saw blade shape and can prevent a connected pipe to be disconnected. It may be either metal or plastic, but it is necessary to withstand the pressure because the cylinder with split part (described later) compresses the connected pipe (described later). It is made of metal such as aluminum, iron and copper alloy.

  When connecting a pipe to be connected, a fastening band (described later) is forcibly reduced in diameter by a bolt and a nut, and the cylindrical body with a split portion is reduced in diameter. Therefore, since the tightening band or the cylindrical body with the split portion must maintain a deformed shape, it is preferable that the fastening band or the cylindrical body is made of a metal such as stainless steel, aluminum, iron, copper, or brass.

  At the back of the tube insertion portion, there are provided a stopper wall for determining the insertion position of the pipe to be connected and an annular groove portion in front of the stopper wall along the circumference of the insertion portion. The stopper wall regulates the insertion position so that the pipe end of the connected pipe is at a predetermined position when the pipe insertion portion is inserted into the connected pipe. The groove part is engaged with the cylindrical body with the split part to prevent the axial movement of the cylindrical body with the split part.

  On the outside of the tube insertion part to which the pipe to be connected of the pipe joint is connected, a notch part for pipe insertion confirmation is provided, the cylindrical body has a split part along the axial direction, and is compressed from the outer peripheral surface. A split ring-shaped cylindrical body with a split part, which is sometimes reduced in diameter, is mounted. The cylindrical body with a split portion is provided with an inwardly extending ridge at one end thereof, and the ridge is caught in and engaged with the groove portion of the tube insertion portion. The connected pipe is inserted between the cylinder with the split part and the pipe insertion part.

  In the pipe joint according to the first aspect of the present invention, the cylindrical body with the split portion is provided with a notch portion into which a protrusion provided on a fastening band mounted thereon is inserted. The notch may have a recessed hole shape or a through-hole shape. In short, the protrusion is fitted into the notch, and the position of the cylinder with the split portion and the fastening band is relative to the circumferential direction. It is sufficient if it has a function to stop moving. Therefore, the notch portion may be replaced by a tube insertion confirmation notch portion, and a protrusion may be inserted into the notch portion. Therefore, hereinafter, the “notch” refers to either the “notch” or the “notch for tube insertion confirmation”.

  In addition, like invention 2, you may make it insert by providing a protrusion in the cylindrical body with a split part, and providing a notch part in a fastening band.

  When a projection is provided on a cylinder with a split part, for example, a slit is partially cut into the split part of the cylinder with a split part or a cylindrical part wall and bent upward, or a hitting mark is punched outward, or created separately. The member may be fixed to the outside to form a protrusion.

  In addition to the split part, the cylindrical body with the split part is provided with a notch at a position corresponding to the vicinity of the stopper wall provided in the connection part. It is possible to visually confirm whether or not the notched portion has been inserted until the tip of the tube to be connected has surely hit the stopper wall at the back of the tube insertion portion. Since this notch is provided in addition to the split part, the position of the pipe end of the pipe to be connected can be confirmed from the notch even if the operator cannot see the split part due to the convenience of connection work, etc. . The cutout portion may have any shape as long as the position of the tube end portion can be visually confirmed, and a circular shape or a long hole shape that is long in the long axis direction is often used.

  The position where the cutout portion is provided may be anywhere as long as it is other than the split portion, and the number thereof is not limited. For example, when the cutout portion is provided at two positions substantially perpendicular to the split portion of the cylindrical body with the split portion, bolt tightening (described later) ), When the tightening band is turned for the sake of convenience, even if the operator is in a wrong working posture or dominant hand, either notch will come to a place where it can be seen, which is convenient.

  The split part provided in the cylindrical body with the split part is provided so that when the cylindrical body with the split part is compressed, the split part is contracted or deformed so that the cylindrical body with the split part is easily reduced in diameter. is there. Further, the inward flange is fitted into a groove provided in the tube insertion portion, and prevents the cylindrical body with the split portion from moving in the axial direction.

  In the cylindrical body with a split portion, a plurality of ridges may protrude in an annular shape in the circumferential direction on the inner peripheral surface of the cylindrical main body. When the cylindrical body with a split portion is tightened by a tightening band to reduce the diameter (described later), the projecting line is deformed by pushing the connected pipe underneath in a ring shape so as to make a line like the projecting line. do. Therefore, the pipe to be connected is locally deformed strongly in a ring shape and is closely contacted with the pipe insertion portion. Therefore, it is often used when a reliable connection or water stop is expected. Absent.

  A tightening band is attached to the outside of the cylinder with the split portion. The fastening band is tightened at both ends of the belt-like body with bolts and nuts. Usually, both ends of the belt-like body are flanges and are provided on the outer peripheral surface of the cylinder with the split part so that the flanges face each other with a gap between them. It has a split ring shape. Through-holes are provided in the facing flanges, and when tightening with bolts and nuts using the through-holes, the flanges come close to each other and the fastening band is reduced in diameter to tighten the cylindrical body with the split part below, Has the function of reducing the diameter.

  Like the split part provided in the split body provided with the split part, that is, the gap between the flanges facing each other, the split part is contracted or deformed so that the tightening band is easily reduced in diameter. It is provided.

  In the pipe joint according to the first aspect of the present invention, a protrusion is provided on the band-shaped main body of the fastening band, and the protrusion can be inserted into a notch provided in the cylindrical body with the split part. In other words, this protrusion is a part of the band-shaped main body and protrudes downward. For example, the band-shaped main body and its side edge are partially cut and bent downward, or from the band-shaped main body to measure. What is necessary is just what protruded the protrusion and bent downward.

  The width of the protrusion is a width that can be freely inserted into and removed from the notch provided in the cylindrical body with the split portion. However, since the width of the split part is usually wider than the width of the notch part, it may also fit into the split part, but when the cylindrical body with the split part is reduced in diameter, the split part becomes narrower and the diameter is reduced. Therefore, care must be taken so that the fitting position does not become a split part. In addition, the allowance is a notch or a length that can be inserted into the notch. When inserted into the notch, the length is such that the insertion position of the connected tube can be confirmed from the back side of the tube insertion portion.

  The fastening band is attached to the outside of the cylindrical body with the split part by inserting the protrusion into a notch provided in the cylindrical body with the split part. Therefore, even if the fastening band is tightened with a bolt and a nut to reduce the diameter of the cylindrical body with the split part, the relative positions of the fastening band and the cylindrical body with the split part do not change.

  That is, since the relative position of the split part of the tightening band and the split part of the cylindrical body with the split part does not change, the degree of tightening of the split part of the cylindrical body with the split part can be visually checked from the split part or the notch part. You can tighten while observing.

  Note that, in the pipe joint of the invention 2, when the projection is provided on the cylindrical body with the split portion and the notch portion is provided in the fastening band, the relationship between the projection and the notch portion is the same, and thus the description thereof is omitted.

  If the position of the bolt and nut provided on the split part of the cylindrical body with the split part and the flange of the fastening band is about 90 degrees, the split part or notch part is easy to see when the working posture is taken during tightening. Although it is convenient, it is only necessary to be visible, and it is needless to say that it is not necessarily limited to about 90 degrees.

  A procedure for connecting a pipe to be connected using the pipe joint of the present invention will be described. First, the connected pipe is inserted between the pipe insertion part of the pipe joint and the cylindrical body with the split part, and it is determined whether the pipe end of the connected pipe has been inserted until it correctly hits the stopper wall at the back of the pipe joint. Check visually from the split part or notch part of the cylindrical body with a part.

  After confirming that the pipe to be connected has been inserted to a predetermined position, turn in the circumferential direction of the tightening band to move the bolt and nut provided on the flange of the tightening band to a position where they can be easily screwed. The protrusion provided on the fastening band or the cylindrical body with the split part is inserted and fitted into the notch part provided on the cylindrical body with the split part or the notch part or the notch part provided on the fastening band. Therefore, when the tightening band is turned, the relative positional relationship between the tightening band and the cylinder with the split part does not change, and the cylinder with the split part moves around the connected pipe in the circumferential direction.

  Since the notch or the notch is provided at a position different from the split part, it is possible to visually check whether the pipe end part of the connected pipe is moved by the above movement from either the notch part or the split part. it can.

  When it is confirmed that the pipe end of the connected pipe is in a predetermined position, the bolts and nuts provided between the flanges of the fastening band are tightened. The tightening band is tightened to reduce the diameter of the cylinder with the split part, and the cylinder with the split part presses the connected pipe to the tube insertion part.

  In the pipe joint of the present invention, the relative position of the split part of the cylindrical body with the split part and the split part of the tightening band does not move due to the tightening operation, and the pipe end of the connected pipe is connected from the notch part. Since it can be confirmed visually, it can be tightened while confirming the tightness. Therefore, the connection reliability is high, and the pipe joint is suitably used for connection of water supply / hot water supply pipes using synthetic resin pipes such as cross-linked polyethylene and polybutene.

  Next, the pipe joint of the present invention will be described with reference to the drawings. In this example, a projection is provided on the side edge of the cylindrical body of the tightening band, and a description will be given using a notched portion of a cylindrical body with a split portion as the notched portion, but it goes without saying that this example is not all. Yes.

  FIG. 1 is an exploded perspective view of an example of the pipe joint of the invention 1 for each part. FIG. 2 is a perspective view in which parts of an example of the pipe joint of FIG. 1 are assembled. FIG. 3 is a half side view of an example of the pipe joint of FIG. FIG. 4 is a side view showing an example of a state in which a protrusion provided on a side portion of an annular main body of a fastening band is fitted in a cutout portion of a cylindrical body with a split portion. FIG. 5 is a component diagram of only a cylindrical body with a split portion and a tightening ring of an example of the pipe joint of the second aspect. FIG. 6 is a cross-sectional view in an annular direction of an example of the pipe joint of the present invention. FIG. 7 is a perspective view of an example of a fastening band.

  As shown in FIGS. 1 to 4, the pipe insertion portion 2 of the pipe joint 1 is provided with a protruding portion having a saw blade shape in the circumferential direction, and the connected pipe P into which the pipe insertion portion 2 is inserted. It can be prevented from coming off. A stopper wall 21 is provided at the back of the tube insertion portion 2, and a water stop packing 22 is provided as necessary.

  An annular groove 23 is provided around the tube insertion portion 2 along the stopper wall 21 at the back of the tube insertion portion 2. The stopper wall 21 restricts the insertion position so that the pipe end of the connected pipe P stops at a predetermined position when the pipe insertion portion 2 is inserted into the connected pipe P. The groove portion 23 is fitted with the flange 32 of the cylindrical body 3 with the split portion, and prevents the cylindrical body 3 with the split portion from moving in the axial direction.

  A cylindrical body 3 with a split portion provided with a notch portion 31 is attached to the outside of the tube insertion portion 2. The cylindrical body 3 with a split part is provided with an inwardly extending ridge 32 at one end thereof, and a split part 33 is formed in a cylindrical main body by inserting a split part 33 in the axial direction. The connected pipe P is inserted between the cylinder 3 with the split part and the pipe insertion part 2.

  It is possible to visually confirm whether or not the notched portion 31 or the split portion 33 has been inserted until the tip of the connected pipe P has surely hit the stopper wall 21 at the back of the tube insertion portion 2. Since this cutout portion 31 is provided in addition to the split portion 33, even if the operator cannot see the split portion 33 due to the convenience of connection work or the like, the pipe end portion of the pipe P to be connected from the cutout portion 31. The position of can be confirmed.

  The cutout portion 31 may have any shape as long as the position of the end portion of the connected pipe P can be visually confirmed. In this example, as shown in FIG. 4, the cutout portion 31 has a rectangular shape that is long along the axial direction. It has a notch shape.

  A split ring-shaped fastening band 4 in which flanges 42 and 43 for fastening are provided at both ends of the cylindrical main body 41 is attached to the outside of the cylindrical body 3 with the split part. As shown in FIG. 7, a nut 431 is provided on the flange 43 of the fastening band 4 by welding or the like. A through hole 422 is provided in the flange 42, and a bolt 421 is inserted into the through hole so as to be screwable with the nut 431. When the bolt 421 is screwed in, the flange 42 and the flange 43 approach each other, the fastening band 4 is reduced in diameter, and the cylindrical body 3 with the split portion below is tightened to reduce the diameter.

  As shown in FIG. 7, the cylindrical body 41 of the fastening band 4 is provided with a projection 411, and the projection 411 can be inserted into the cutout portion 31 of the cylindrical body 3 with the split portion. This protrusion 411 is a part of the cylindrical main body 41 protruding sideways, and the width of the protrusion 411 is a width that can be freely fitted into and removed from the notch 31 provided in the split cylinder 3. It is said that. The allowance is set to a length that can be fitted into the notch 31 and a length that allows the insertion position of the connected pipe P to be confirmed from the depth of the tube insertion portion of the notch 31.

  The fastening band 4 is attached to the outside of the cylindrical body 3 with the split portion by fitting a protrusion 411 provided on the side of the cylindrical main body 41 into the cutout portion 31 of the cylindrical body 3 with the split portion (FIG. 6). reference). Therefore, even if the fastening band 4 is fastened with the bolt 421 and the nut 431 and the cylindrical body 4 with the split part is reduced in diameter, the relative positions of the fastening band 4 and the cylindrical body 3 with the split part do not change.

  A slit 44 is provided between the flanges 42 and 43 of the fastening band 4, and when the flange 42 and the flange 43 are fastened by a bolt 421 and a nut 431, a split 33 provided in the cylindrical body 3 with a split is provided. Similarly, the split band 44 is contracted or deformed so that the fastening band 4 is easily reduced in diameter.

  In the example of FIGS. 1 to 5, the positional relationship between the bolt 421 and the nut 431 provided in the split portion 33 of the cylindrical body 3 with the split portion and the flanges 42 and 43 of the fastening band 4 is about 90 degrees. . Of course, as long as it is visible as described above, it is needless to say that this angle is not necessarily limited to about 90 degrees.

It is the perspective view which decomposed | disassembled for every component of the example of the pipe joint of invention 1. It is the perspective view which assembled the components of an example of the pipe joint of FIG. It is a half side view of an example of the pipe joint of FIG. It is a side view which shows an example of the mode that the protrusion provided in the side part of the cyclic | annular main body of a fastening band was fitted in the notch part of the cylindrical body with a split part. It is a component drawing of only the cylindrical body with a split part of an example of the pipe joint of invention 2, and a clamping ring. It is sectional drawing of the ring cutting direction of an example of the pipe joint of this invention. It is a perspective view of an example of a fastening band.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Pipe insertion part 21 Stopper wall 22 Seal for water stop 23 Groove part 3 Cylindrical body with a split part 31 Notch part 32 Projection 33 Split part 4 Tightening band 41 Cylindrical main body 411 Projection 42, 43 Flange 421, 431 Bolt And nut 422 Through hole 44 Split part P Connected pipe

Claims (2)

  A pipe insertion part to be inserted into the pipe to be connected and a split part provided on the outside of the pipe insertion part along the axial direction of the cylindrical main body, and having a diameter reduced when tightened from the outer peripheral surface. A cylindrical body with a portion and a tightening band that is provided outside the cylindrical body with a split portion and tightens both ends of the belt-like main body with bolts and nuts. A pipe joint provided with a notch. A pipe insertion portion to be inserted into a connected pipe body and a split portion provided on the outer side of the pipe insertion portion along the axial direction of the cylindrical main body, and having a diameter reduced when compressed from the outer peripheral surface. A cylindrical body with a portion and a tightening band that is provided on the outer side of the cylindrical body with a split portion and tightens both ends of the belt-shaped body with bolts and nuts. A pipe joint provided with a notch.

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