JP2006105269A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint for a metal pipe realizing loosening prevention just by insertion without fastening work of screws, or usage of an exclusive tool or other tools. <P>SOLUTION: The pipe joint is provided with a joint body having an opening for inserting a pipe, an anti-loosening piece holder with a cylindrical shape having a slightly larger inner diameter than an outer diameter of the pipe, capable of slightly moving in a joint body direction, an anti-loosening piece attached to a cutout part of the anti-loosening piece holder so as to slightly move in an outward direction of the anti-loosening piece holder, and abut on an outer circumferential face of a pipe to be connected, an anti-loosening piece presser fit on the anti-loosening piece holder to press the anti-loosening piece in a pipe axis direction, and a tapered outer pipe wherein a tapered part with a diameter becoming smaller from a joint body side toward a pipe through hole in an end is provided in an inner face, and the tapered part is fastened to the joint body so as to abut on the anti-loosening piece presser. By abutting the tapered part of the tapered outer pipe on the anti-loosening piece presser, loosening and disengagement from the pipe joint of a pipe inserted in the pipe joint is prevented. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pipe joint suitable for connecting a metal pipe, particularly a stainless steel pipe.

  Conventionally, metal pipes that pump fluid, especially pipe joints used to connect stainless steel pipes, are made by screwing pipes and screwing pipes into threaded pipe joints, and by providing a seal member on the inside. Inserting a pipe into a pipe joint and pressing it with a special tool together with the pipe joint, expanding the end of the pipe into a chevron with a special tool, pressing the crest with a cap nut to prevent the pipe from coming off, By having a tapered inner surface that decreases in diameter toward the tip of the pipe joint, the locking member is pressed against the pipe by the coil spring and the tapered surface, and when the force acts in the pulling direction of the pipe, the locking member is further pressed against the pipe In order to prevent slipping, an annular retaining member having a diameter reduced by tightening a cap nut and the retaining member biting into the pipe has been used.

However, in the above-described conventional pipe joint, if a tool for cutting a screw in a pipe or a special tool for pressing or expanding the diameter is required, it is necessary to carry the tool, and it takes time to process the pipe with the tool. There are disadvantages. Although a special tool is not used, in pipe fittings where the retaining member bites into the pipe by tightening the cap nut, a large force is required to tighten the cap nut when used on a hard pipe such as stainless steel. It is necessary to use a long spanner or pipe wrench, which makes it difficult to connect in a narrow space. In addition, in a pipe joint that presses the locking member against the pipe by a coil spring built in the taper inner surface and prevents it from coming off, the coil spring is mounted in the pipe joint, so the joint length becomes long and the narrow part However, it was difficult to install the pipe joint.
Japanese Utility Model Publication No. 7-55424 (0016, FIG. 1, FIG. 3, FIG. 4) JP 2001-295974 A (0014, FIG. 1) JP-A-10-196860 (0004, 0005, FIGS. 1 and 7)

  Accordingly, an object of the present invention is to provide a pipe joint that can prevent the pipe from being pulled out by simply inserting the pipe without using a screw fastening operation, a dedicated tool, or other tools.

  Another object of the present invention is to provide a pipe joint capable of shortening the joint length.

  Another object of the present invention is to provide a pipe joint which can easily assemble the whole or parts and can obtain a large pull-out preventing force even if a large pull-out force acts on the pipe.

  Another object of the present invention is to provide a pipe joint that can be disassembled as a whole and that can be easily recycled, reused, or repaired by replacing relatively inexpensive parts.

  In addition, another object of the present invention can be implemented as a socket in which two pipes are straightly aligned, or can be formed into an elbow, a tee, a socket with a different diameter, a one-side threaded joint, or any other form. It is to provide a pipe joint having a high degree of freedom in design.

  The configuration of the present invention for achieving the above-described object includes a joint main body having a seal groove in which a seal member is mounted on the inner surface of the opening for inserting a pipe to be connected, and slightly outside the outer diameter of the pipe to be connected. A retaining piece holder that has a large inner diameter and is provided with a plurality of notches for mounting retaining pieces on the circumference thereof, and can be moved slightly toward the joint body, and a retaining piece holder A retaining piece mounted on the notch of the retaining piece holder so that the retaining piece holder can be moved slightly in the outward direction and in contact with the outer peripheral surface of the connecting pipe, and the retaining piece and / or the retaining member. A retaining piece presser that is fitted on the piece holder and presses in the core direction of the pipe connecting the retaining piece, and a taper that has a tube passage hole at the end and is reduced in diameter from the joint body side toward the tube passage hole. On the inner surface Is made of a locking piece pressing and (or) missing tapered outer tube which is engaged in the fitting body so as to abut against the stop piece Pas portion escapes.

  Further, according to the present invention, in the pipe joint of the preceding paragraph, the width of the notch portion of the retaining piece holder may be slightly narrower on the inner side than the retaining piece and wider on the outer side than the retaining piece. it can.

  Further, according to the present invention, in any one of the above pipe joints, a cushion material made of an elastic material is interposed between the joint body and the retaining piece holder, and the retaining piece, the retaining piece holder, and the retaining piece presser are held. It can be moved slightly to the joint body side.

  Further, according to the present invention, in any of the above pipe joints, the retaining piece is harder than the pipe to be connected, the retaining piece holder, the retaining piece presser, and the tapered outer pipe, and the retaining piece is connected. It has an appropriate number of sharp teeth that bite into the outer peripheral surface of the pipe, and the angle formed by the straight line connecting the vertices of the teeth and the back of the retaining piece is more than the angle formed by the connecting pipe and the inner surface of the tapered outer pipe Can also be set small.

  Further, according to the present invention, in any one of the above pipe joints, the seal member is detachable from the seal groove, the tapered outer pipe is detachable from the joint main body by screwing or the like, and the tapered outer pipe is separated from the joint main body. The retaining piece holder is separable from the fitting body, and the retaining piece presser is separable from the retaining piece holder, and the retaining piece is removed when the retaining piece retainer is separated from the retaining piece holder. It can be separable from the stopper holder.

  Further, according to the present invention, in any of the above pipe joints, it is preferable that the retaining piece presser is made of the same metal as the pipe joint and is a thin metal cylinder covering all the retaining pieces. It can also be made into a thin metal band covering a part. The retaining piece presser can be made of a rubber-like elastic body. When the retaining piece presser is made of a rubber-like elastic body, a certain amount of thickness is required. Therefore, it is desirable that the retaining piece is formed in a band shape covering a portion excluding the tip portion that contacts the tapered portion.

  The present invention can be implemented in any one of the above-described pipe joints as a socket in which two pipes are straightly aligned with the pipe axis, in an elbow, a tee, a socket with a different diameter, a one-side threaded joint, or any other form. Can be formed.

  The present invention is fitted on a joint body, a retaining piece holder movable in the direction of the joint body, a retaining piece mounted on the retaining piece holder, a retaining piece and / or a retaining piece holder. A pipe connected from the pipe passage hole of the taper outer pipe by the structure of the taper outer pipe locked to the joint body so that the stopper piece presser and the taper portion abut the stopper piece and / or the stopper piece. , The retaining piece holder is pressed in the direction of the joint body together with the retaining piece and retaining piece retainer, and moves slightly in the direction away from the tapered outer tube. At this time, the retaining piece is removed by the inserted tube. The section of the retaining piece holder moves outward from the retaining piece holder against the retaining piece holder, and the cross section of the retaining piece holder changes from a circular shape to a polygonal shape. (Or) by the contact of the stopper piece, a force for pressing the retainer piece of retaining piece holding the tube continues to maintain. For this reason, it connects only by inserting the pipe | tube connected from the pipe | tube passage hole of a taper outer pipe | tube, without using any tools as well as a dedicated tool, and it does not come off from a pipe joint and comes off.

  Further, according to the present invention, in the above-described configuration, a retaining piece presser and a tapered outer tube that are fitted on the retaining piece and / or the retaining piece holder and press in the core direction of the tube connecting the retaining piece. As a result, a coil spring for pressing the retaining piece becomes unnecessary, and the length of the pipe joint can be shortened by the amount of the coil spring.

  Further, according to the present invention, in the above configuration, the notch portion of the retaining piece holder has a width that is slightly narrower on the inside than the retaining piece and wider on the outside than the retaining piece. Make it easy to attach the retaining piece to the retaining piece holder, make it difficult to remove the retaining piece from the retaining piece holder, and make it easy to assemble the retaining unit that consists of the retaining piece holder, retaining piece, and retaining piece retainer. Can do.

  Further, according to the present invention, in the above configuration, the cushion body made of an elastic material is interposed between the joint body and the retaining piece holder, and the retaining body side, the retaining piece holder, and the retaining piece presser are slightly connected to the joint body side. The gap between the retaining unit and the tapered portion of the tapered outer tube is increased, the retaining piece is easily expanded, and the connecting tube is inserted from the tube passage hole of the tapered outer tube. Can be made easy.

  Further, the present invention is configured so that the hardness of the retaining piece is higher than that of the pipe to be connected, the retaining piece holder, the retaining piece presser, and the tapered outer tube, An appropriate number of sharp teeth that bite into the outer peripheral surface of the pipe to be connected are provided, and the angle formed by the straight line connecting the apexes of the teeth and the back of the retaining piece is the angle formed by the connecting pipe and the inner surface of the tapered outer pipe By setting it smaller than this, resistance at the time of inserting from the tube passage hole of the tapered outer tube of the tube to be connected can be made smaller, and tube insertion can be facilitated. In addition, when a large pulling force is applied to the connected pipe, the taper part of the tapered outer pipe works to press the retaining piece against the pipe, and this force concentrates on the teeth located closest to the joint body side and pulls out greatly. It acts on the tube as a blocking force, and when a larger pulling force acts on the tube, the angle formed by the straight line connecting the apex of the teeth and the back of the retaining piece is larger than the angle formed by the tube and the inner surface of the tapered outer tube. Even if the retaining piece holder is dragged by the pipe and moved in the opposite direction to the joint body, the second and third teeth will bite into the pipe with a slight movement, and a greater pulling prevention force will be obtained. Will have.

  Further, according to the present invention, in the above configuration, the seal member can be freely attached to and detached from the seal groove, and the taper outer tube can be attached to and detached from the joint body by screwing or the like, and the taper outer tube is prevented from being detached when separated from the joint body. The single holder can be separated from the fitting body, and the retaining piece presser can be separated from the retaining piece holder, and the retaining piece can be separated from the retaining piece holder when the retaining piece retainer is separated from the retaining piece holder. By doing so, the entire pipe joint can be disassembled, and it becomes easy to recycle, reuse, or repair by replacing relatively inexpensive parts such as a seal member and a retaining unit.

  Furthermore, the present invention provides the retaining piece presser in the above-described configuration, whether it is a thin metal cylindrical shape covering all the retaining pieces, or a thin metal band shape covering a part of the retaining pieces. Even if it is formed in a rubber-like elastic band covering a part, all of the above effects can be expected, and in any of the above-mentioned pipe joints, the two pipes are straightened. Implementing as a uniform socket can also be formed into an elbow, tee, socket with different diameter, one-side threaded joint, or any other form, and has the advantage of a high degree of freedom in design.

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

  FIG. 1 and the following figures show an embodiment in which the present invention is implemented as a socket in which two pipes are straightly aligned, and this embodiment is a seal member on the inner surface of the opening for inserting the pipe 1 to be connected. A joint body 4 having a seal groove 3 to which 2 is mounted, and a notch for mounting a retaining piece 5 on the circumference of a cylindrical shape having an inner diameter slightly larger than the outer diameter of the pipe 1 to be connected A plurality of portions 6 are provided at equal angles on the circumference, the retaining piece holder 7 that can move slightly in the direction of the joint body 4, and the notch portion 6 of the retaining piece holder 7. The retaining piece 5 mounted so as to be slightly movable outwardly of the retaining piece holder 7 and in contact with the outer peripheral surface of the pipe 1 to be connected, and the retaining piece 5 and the retaining piece holder 7 are externally fitted. Pushed in the direction of the core of the pipe 1 connecting the retaining piece 5 And a taper portion 10 having a pipe passage hole 9 at the end and a diameter decreasing toward the pipe passage hole 9 from the joint body 4 side on the inner surface. It comprises a tapered outer tube 11 locked to the joint body 4 so as to abut against the presser 8. The number of the notches 6 and the retaining pieces 5 is six in the illustrated example, but is appropriately selected depending on the inner diameter of the joint body 4.

  The width of the notch 6 of the retaining piece holder 7 is formed so that the inner width is slightly narrower than the retaining piece 5 and the outer width is wider than the retaining piece 5.

  Further, an annular cushion material 12 made of an elastic material such as rubber is interposed between the joint body 4 and the retaining piece holder 7 so that the retaining piece 5, the retaining piece holder 7 and the retaining piece presser 8 are slightly connected. It can be moved to the main body 4 side.

  The retaining piece 5 is made of a metal having a hardness higher than that of the pipe 1 to be connected, the retaining piece holder 7, the retaining piece presser 8, and the tapered outer tube 11. An appropriate number of sharp saw teeth 13 that bite into the outer peripheral surface are provided, and the angle formed by the straight line connecting the apexes of the saw teeth 13 and the back of the retaining piece 5 is formed by the pipe 1 and the inner surface of the tapered outer pipe 11 connected. It is set smaller than the angle.

  In the illustrated embodiment, the seal member 2 is detachably attached to the seal groove 3, and the female screw of the tapered outer tube 11 is detachably screwed with the male screw on the outer peripheral surface of the joint body 4. When the tapered outer tube 11 is separated from the joint body 4, the retaining piece holder 7 can be separated from the joint body 4, and the retaining piece presser 8 can be separated from the retaining piece holder 7 and is prevented from coming off. When the single presser 8 is separated from the retaining piece holder 7, the retaining piece 5 can be separated from the retaining piece holder 7.

  Further, the retaining piece 5 and the retaining piece presser 8 that is externally fitted to the retaining piece holder 7 are thin metal cylinders of the same type as the pipe joint, and cover all the retaining pieces 5. ing. However, in carrying out the present invention, it may be formed in a rubber-like elastic band shape covering all but the tip of the retaining piece 5 or a thin metal band shape covering a part of the retaining piece 5. .

  When the retaining piece presser 8 has a cylindrical shape that covers all the retaining pieces 5, the retaining piece retainer 8 comes into contact with the tapered portion 10 of the tapered outer tube 11. 5, for example, when the retaining piece presser 8 has a thin band shape, the retaining piece retainer 8 and the retaining piece 5 abut against the tapered portion 10 of the tapered outer tube 11, or Only the retaining piece 5 comes into contact with the tapered portion 10 of the tapered outer tube 11.

  As shown in FIG. 2, when the pipe 1 connected to the retaining piece holder 7 is inserted from the tube passage hole 9 of the tapered outer tube 11 of the pipe joint, the retaining piece holder 7, the retaining piece 5, the retaining member The retaining unit composed of the single presser 8 moves slightly in the direction of the joint body 4 against the elasticity of the cushion material 12 due to the friction between the retaining member holder 7 and the tube 1, and is detached from the tapered portion 10 of the tapered outer tube 11. The contact of the stopper piece presser 8 is released, and a gap is generated between the retaining unit and the tapered portion 10 of the tapered outer tube 11. On the other hand, the retaining piece 5 is pressed by moving against the outer peripheral surface of the inserted tube 1 and moves outwardly from the retaining piece holder 7. At this time, the section of the retaining piece retainer 8 changes from a circular shape to a polygonal shape. Although it is deformed (see FIG. 10), the retaining piece presser 8 comes into contact with the tapered portion 10 of the tapered outer tube 11, so that further deformation of the retaining piece retainer 8 and that of the retaining piece 5 are achieved. The above movement is hindered, and when the insertion of the tube 1 is completed, the sawtooth 13 of the retaining piece 5 is strongly pressed against the outer peripheral surface of the tube 1 by the retaining piece presser 8 in contact with the tapered portion 10, and the tube 1 is firmly Is connected to the pipe joint and does not come off the pipe joint.

  The amount of movement of the retaining piece holder 7 in the direction of the joint body 4 due to the insertion of the pipe 1 to be connected to the retaining piece holder 7 and the removal of the retaining piece 5 due to contact with the outer peripheral surface of the inserted connecting pipe 1 By appropriately setting the amount of movement of the stopper piece holder 7 in the outward direction and the gradient of the tapered portion 10 of the tapered outer tube 11, a large pulling prevention force can be obtained.

  The retaining piece 5 has an appropriate number of sharp saw teeth 13 that bite into the outer peripheral surface of the pipe 1 to be connected, and the angle formed by the straight line connecting the apexes of the saw teeth 13 and the back of the retaining piece 5 is connected. Since the angle formed by the tube 1 and the inner surface of the tapered outer tube 11 is set smaller than that, even if the retaining piece holder 7 is dragged by the tube 1 and moves in the direction opposite to the joint body 4, the slight movement thereof is possible. Since the second and third teeth bite into the tube, it is possible to obtain a larger pull-out preventing force.

  The width of the notch 6 of the retaining piece holder 7 is formed so that the inner width is slightly narrower than the retaining piece 5 and the outer width is wider than the retaining piece 5. 5 is easy to attach to the retaining piece holder 7, and it is difficult to remove the attached retaining piece 5 from the retaining piece holder 7, and the retaining unit comprising the retaining piece holder 7, the retaining piece 5, and the retaining piece presser 8 is provided. Easy to assemble.

  Further, by interposing a cushion material 12 between the joint body 4 and the retaining piece holder 7, the clearance between the retaining unit and the tapered portion 10 of the tapered outer tube 11 is increased, and the retaining piece 5 can be easily expanded. In addition, the tapered outer tube 11 of the tube 1 to be connected can be easily inserted from the tube passage hole 9.

  Further, the seal member 2 is detachably attached to the seal groove 3, the taper outer tube 11 is detachably attached to the joint body 4 by screwing, and is prevented from being detached when the taper outer tube 11 is separated from the joint body 4. When the single holder 7 is separable from the joint body 4, the retaining piece presser 8 is separable from the retaining piece holder 7 and when the retaining piece retainer 8 is separated from the retaining piece holder 7. Since the retaining piece 5 can be separated from the retaining piece holder 7, the entire pipe joint can be disassembled, and by replacing relatively inexpensive parts such as the seal member 2 and the retaining unit. Easy to recycle / reuse or repair.

Sectional drawing in the use condition which abbreviate | omitted hatching of Embodiment 1 of this invention. Sectional drawing which abbreviate | omitted hatching of embodiment of FIG. 1 which has inserted the pipe | tube. The half cross-sectional view which omitted the hatching of the retaining unit comprising the retaining piece holder, the retaining piece, and the retaining piece presser. The side view of a retaining unit comprising a retaining piece holder, a retaining piece, and a retaining piece presser. Sectional drawing which abbreviate | omitted hatching of the retaining piece holder and retaining piece in the state which isolate | separated the retaining piece presser. FIG. 6 is a cross-sectional view taken along line AA in which hatching in FIG. 5 is omitted. The half sectional view which abbreviate | omitted hatching of the retaining piece holder of the state which isolate | separated the retaining piece. FIG. A side view of a retaining piece presser. The side view of a retaining unit comprising a retaining piece holder, a retaining piece, and a retaining piece presser when a tube is inserted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe to connect 2 Seal member 3 Seal groove 4 Joint body 5 Retaining piece 6 Notch 7 Retaining piece holder 8 Retaining piece press 9 Pipe passage hole 10 Taper part 11 Taper outer pipe 12 Cushion material 13 Saw tooth

Claims (7)

  A joint body having a seal groove in which a seal member is mounted on the inner surface on the opening side for inserting a pipe to be connected, and a cylindrical shape having an inner diameter slightly larger than the outer diameter of the pipe to be connected, on its circumference A retaining piece holder that is provided with a plurality of notches for mounting the retaining pieces and can be moved slightly in the direction of the joint body, and an outward direction of the retaining piece holder at the notched portion of the retaining piece holder Are attached to the retaining piece and / or retaining piece holder so as to contact the outer peripheral surface of the pipe to be connected. A retaining piece presser that presses in the core direction of the tube, and a tapered portion that has a tube passage hole at the end and a diameter that decreases from the joint body side toward the tube passage hole, and the tapered portion is a retaining piece. Holding and / or retaining Pipe joint comprising a tapered outer tube which is engaged in the fitting body so as to contact the strip.   The pipe joint according to claim 1, wherein the notch portion of the retaining piece holder has an inner width slightly narrower than the retaining piece and an outer width wider than the retaining piece.   A cushioning material made of an elastic material is interposed between the joint body and the retaining piece holder so that the retaining piece, the retaining piece holder, and the retaining piece presser are slightly movable toward the joint body. Item 3. The pipe joint according to Item 2.   The retaining piece is harder than the pipe to be connected, retaining piece holder, retaining piece retainer, and tapered outer tube, and the retaining piece has an appropriate number of sharp teeth that bite into the outer peripheral surface of the connecting tube. The step is provided, and the angle formed between the straight line connecting the apexes of the teeth and the back of the retaining piece is set smaller than the angle formed between the connecting pipe and the inner surface of the tapered outer pipe. The pipe joint according to crab.   The seal member is detachable from the seal groove, the tapered outer tube is detachable from the joint body by screwing, etc., and the retaining piece holder can be separated from the joint body when the tapered outer tube is separated from the joint body 2. The retaining piece holder can be separated from the retaining piece holder, and the retaining piece can be separated from the retaining piece holder when the retaining piece retainer is separated from the retaining piece holder. 4. The pipe joint according to any one of 4.   The retaining piece presser is a thin metal cylinder or rubber elastic cylinder that covers the retaining piece, or a thin metal band or rubber elastic band that covers a part of the retaining piece. The pipe joint according to any one of claims 1 to 5. The pipe joint according to any one of claims 1 to 6, wherein the form is any one of a socket, an elbow, a tee, a socket with a different diameter, and a screw on one side.