JP2018025245A - Pipe length adjusting joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine a length of a joint to facilitate the fixing operations of an outer sheath tube 2 and an inner sheath tube 1, in an extendible pipe joint comprising: seal mechanism section 23 constituted of an outer sheath tube 2 and an inner sheath tube 1, and having a pipe passage connection length adjusted by the insertion depth of the inner sheath tube 1 so that an insertion portion is sealed; and suitable pipe connection parts 22 and 62 at the individual outer side ends of the outer sheath tube 2 and the inner sheath tube 1.SOLUTION: At the suitable positions of the outer circumferences of an outer sheath tube 2 and an inner sheath tube 1, there are protruded connection protrusions 13 and 24 for mounting a position fixing rod bolt 3, connection protrusions 13 and 24 are formed with the openings 131 and 241, through which the rod bolt 3 can pass, and installation hole parts 132 and 242 communicating with said opening and having larger diameters than the opening width. A rod bolt mounted in said connection protrusions is clamped and fixed by using nuts 4a and 4b having a cylindrical portion 41 closely fitted in the mounting hole portion.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a pipe length adjusting joint that enables adjustment of the pipe length of a pipe connecting portion.

  Various structures are known as pipe length adjusting joints, and the present invention relates to a sleeve type which is composed of an outer sheath pipe and an inner intubation and adjusts the pipe connection length by the insertion depth.

  Sleeve-type pipe length adjustment joints have through-holes for connection at the joint protrusions (often also used as a joint flange for flange connection with the connection pipe) provided on the outer sheath pipe and the inner insertion pipe, respectively. Then, the bolts are inserted through the connecting through holes, and fixing nuts are arranged on the front and back sides of the connecting through holes and screwed together to fix the depth of the insertion tube by fixing the rod bolts. It is set.

  In particular, in Patent Document 1, if the connecting protrusion serves as a joint flange with the connecting pipe, the mounting distance becomes long, and it is troublesome to align the through bolt (bar bolt) with the connecting through hole. There has been disclosed a proposal for improving workability by providing a connecting projection of a pipe separately from a joint flange and shortening a through bolt that has been extended over the entire length of the pipe joint.

  Further, in Patent Document 2, a small collar portion is provided at an appropriate position on the outer periphery of the inner intubation tube, and a through bolt is inserted and fixed to a stopper ring (two halves) that can be pivotally aligned with the small collar portion interposed therebetween. It has been proposed to facilitate the hole alignment.

JP2000-154894A. Utility model registration No. 2564340.

  In any case, the above-mentioned pipe length adjusting joint must be installed through the connecting through holes of the joint flange at a position away from the through bolt for pipe connection. It becomes long and the hole alignment operation | work with the connection through-hole of the said joining flange will become troublesome.

  Therefore, the present invention proposes a novel pipe joint that allows a rod bolt to be externally incorporated without using a through bolt.

  The pipe length adjusting joint according to claim 1 of the present invention is composed of an outer sheath pipe and an inner intubation, a pipe connection length is adjusted by an insertion depth of the inner intubation, and a sealing mechanism portion in which the insertion portion is sealed. A pipe length adjusting joint provided with appropriate tube connecting portions at outer end portions of the outer sheath tube and the inner intubation tube, and a rod bolt for fixing the position at an appropriate position on the outer peripheral surface of the outer sheath tube and the inner tube. A connecting projection to be mounted is provided, an opening through which the rod bolt can pass is provided in the connecting projection, and a mounting hole that is in communication with the opening and has a diameter larger than the width of the opening is provided. It is characterized in that the rod bolt mounted on the base plate is clamped and fixed by using a nut provided with a cylindrical portion for tightly fitting in the mounting hole portion.

  The above-mentioned joint can be obtained by setting the insertion depth of the inner tube into the outer sheath tube, and the desired joint length can be obtained. A predetermined pipe line is configured by connecting to the target pipe, and the outer sheath pipe and the inner intubation are fixed at the position. This fixing is performed by inserting a rod bolt into the mounting hole of each connecting projection adjusted to a predetermined position from the opening, and clamping each connecting projection with a nut screwed to the rod bolt. In particular, the tube portion of the nut is closely fitted in the mounting hole portion, thereby preventing the rod bolt from coming out (disengaging) from the mounting hole portion.

  In the pipe length adjusting joint according to claim 2 of the present invention, the pipe connecting portion of the inner intubation has an insertion rotation locking type joint structure, and the pipe connecting portion of the outer sheath pipe corresponds to the joint structure of the inner intubating tube. A pipe line that is formed by providing a locking projection and is provided with a seal on the inner peripheral surface of the inner end of the outer sheath tube, and is connected by an insertion rotation lock. An existing pipe (not provided with a locking projection) that forms (Patent No. 4033254) can be adopted as an intubation tube, and the pipe length can be easily adjusted when the pipe is formed by the existing pipe.

  Further, in the pipe length adjusting joint according to claim 3 of the present invention, the seal mechanism part is a sheath pipe flange also serving as a connecting projection provided at the inner end of the outer sheath pipe, an O-ring arranged on the outer periphery of the inner tube, While comprising a water stop ring plate that faces the sheath pipe flange and clamps the O-ring, around the sheath pipe flange and the water stop ring plate is provided with a connecting through hole for the pinching at a predetermined interval, The water stop ring plate is provided with an opening and a mounting hole corresponding to the opening and the mounting hole of the sheath tube flange.

  Thus, in the above configuration, the joint length is adjusted at the fixed position of the connecting projection of the inner tube and the sheath pipe flange (connecting projection) of the outer sheath tube, but the O-ring is sandwiched between the sheath tube flange at the position. The water stop ring is made to face, and according to the fixing means of the joint length described above, and further securely tightening the connecting bolt and nut attached to the connecting through hole, the inner tube and the outer sheath tube are securely sealed.

  As described above, the configuration of the present invention simplifies the positioning operation by inserting the rod bolts for positioning (fixing) the inner insertion tube and the outer sheath tube from the outer peripheral direction of each connection projection as described above. Is.

The exploded view (front view) of 1st embodiment of this invention. Explanatory drawing (front view) of the fixing work. The same side view. The partial expansion perspective view of the principal part (connection protrusion). The exploded view (front view) of the second embodiment. Explanatory drawing (front view) of the fixing work. The same side view.

  Next, an embodiment of the present invention will be described. 1 to 4 show a first embodiment of the present invention, in which an inner tube 1 and an outer tube 2 into which the inner tube 1 is inserted from one open end (inner end) and both are fixed at predetermined positions. And the two types of nuts 4a and 4b screwed to the rod bolt 3.

  The inner intubation 1 includes a connection projection 13 for fixing the position of the tube main body 11, the tube connection portion 12, and the outer sheath tube 2.

  The pipe body 11 is a pipe having the same diameter as the pipe to be used for the pipe joint, and is provided with a pipe connecting portion 12 at one end (outer end), and further has a connecting projection 13 in the outer peripheral direction in the vicinity of the outer end. Protruding to.

  The pipe connecting portion 12 is an insertion rotation locking type joint structure shown in Japanese Patent No. 4033254 related to the applicant's proposal, and has an engaging groove 121, a seal housing groove 122, and an inner peripheral surface. , And a part on the opening end side of the engaging recess 121 is cut out to form the opening end cutout 123.

  The engaging recess 121 and the open end notch 123 have the same structure as a locking projection (not shown) of the connection pipe to be connected (not shown. The locking projection 222 of the pipe connection 22 of the outer sheath pipe 2 described later). And the locking projection is positioned in the engagement recess 121 so as to prevent the connecting pipe to be connected from coming off by mutual locking. It is. The seal housing groove 122 is provided in the back of the engagement groove 121 and includes a ring seal 124 therein.

  The connecting protrusion 13 has a triangular flange shape and protrudes in the vicinity of the outer end, and has an opening 131 that opens to the outer peripheral side at each triangular apex (at intervals of 120 degrees), and communicates with the opening 131 and has an opening 131. A mounting hole 132 having a diameter larger than the width of the mounting hole 132 is provided. In particular, the opening width of the opening 131 is provided so that the rod bolt 3 can pass therethrough.

  The outer sheath tube 2 includes a tube main body 21, a tube connection portion 22, a seal mechanism portion 23, and a connection protrusion 24 for fixing the insertion depth of the inner intubation tube 1.

  The tube body 21 has a diameter into which the tube body 11 of the inner tube 1 can be inserted, a tube connection portion 22 is provided at the outer end, and a seal mechanism portion 23 is provided at the inner end. The tube connecting portion 22 is formed by a connecting tube 221 that is integrally connected (welded) to the tube main body 21 and a locking projection 222 provided on the outer periphery of the connecting tube 221, and the locking projection 222 is the above-described engagement projection. It is provided at a position and a size corresponding to the joint recess 121 and the open end notch 123.

  Further, the seal mechanism portion 23 connects (welds) the outer tube portion 232 provided with the seal mounting recess 231 to the inner end of the pipe body 21, and the seal mounting recess 231 has a ring seal having a horizontal U-shaped cross section. 233 is fitted and mounted.

  Further, in the vicinity of the inner end of the tube main body 21, an opening 241 similar to the connection protrusion 13 of the inner tube 1 and a connection protrusion 24 including a mounting hole 242 are provided.

  The rod bolt 3 corresponds to the length in which the inner tube 1 and the outer sheath tube 2 can be inserted, and the nuts 4a and 4b are screwed to the rod bolt 3, and each of the connecting projections 13 and 24 is a set thereof. In particular, one nut 4a is provided with a cylindrical portion 41 that is closely fitted in the mounting hole portions 132, 242 and has a protruding length shorter than the thickness of the connecting protruding portions 13, 24.

  Thus, the pipe length adjusting joint having the above-described configuration can obtain a desired joint length by setting the insertion depth of the inner insertion pipe 1 into the outer sheath pipe 2, and the connection protrusions 13 and 24 at the position of the desired length. The protruding directions (by rotation adjustment) are made to coincide, and the nuts 4a and 4b are screwed into the rod bolts 3 in advance at positions where the connecting protrusions 13 and 24 are sandwiched, respectively.

  Next, the rod bolt 3 is inserted into the mounting holes 132 and 242 from the openings 131 and 241, and the nuts 4 a and 4 b are screwed together with the tube portion 41 of each nut 4 a being closely fitted in the mounting holes 132 and 242. Tighten and fix the connecting protrusions 13 and 24 by pressing. Therefore, when the rod bolt 3 is mounted, the rod bolt 3 can be easily mounted and fixed without requiring a through-mounting operation for the mounting holes 132 and 242.

  The pipe joint fixed to a desired length is constructed by continuously connecting a pipe having a pipe connection part 12 similar to the inner insertion pipe 1 and a pipe connection part 22 of the outer sheath pipe 2 to form a predetermined pipe line. To do.

  5 to 7 show the second embodiment. Basically, as in the first embodiment, the inner intubation tube 5 and the inner intubation tube 5 are externally inserted from one opening end (inner end). Two types of nuts 4a into which the sheath tube 6, the waterstop ring 7 and the O-ring 8 and the connecting bolt / nut 9 constituting the seal mechanism, and the rod bolt 3 and the rod bolt 3 for determining the joint length are screwed together. , 4b.

  The intubation tube 5 is provided with a connecting projection 53 for fixing the position of the tube connecting portion 52 and the outer sheath tube 6 on the tube main body 51. The tube connecting portion 52 is a housing joint for connecting to the connecting tube. As in the configuration of the first embodiment, the connecting protrusion 53 is a triangular flange and is provided around the outer end, and the opening 531 and the mounting hole 532 are spaced 120 degrees apart. Is provided.

  The outer sheath pipe 6 is provided at a pipe main body 61 having a diameter into which the pipe main body 51 of the inner intubation tube 5 can be inserted, a pipe connecting portion 62 provided at the outer end of the pipe main body 61, and an inner end of the pipe main body 61. It is composed of a sheath pipe flange 63.

  The pipe connecting portion 62 includes a connecting pipe (same pipe diameter as that of the inner insertion pipe 5) 621 that is integrally connected (welded) to the pipe main body 61, and a protrusion 622 for a housing joint.

  The sheath pipe flange 63 is provided with an opening 631 and a mounting hole 632 at a position of 120 degrees and a connecting through hole 633 between the mounting holes 632. The inner peripheral edge of the sheath pipe flange 63 is formed on an inclined surface to serve as an attachment receiving portion 634 for the O-ring 8.

  The water stop ring 7 is provided with an opening 71, a mounting hole 72, and a connecting through hole 73, similar to the sheath pipe flange 63.

  The one mounting hole (632, 72) in the sheath pipe flange 63 and the waterstop ring plate 7 may have the same diameter without being larger than the opening (631, 71).

  Thus, in the pipe length adjusting joint having the above-described configuration, the desired joint length can be obtained by setting the insertion depth of the inner tube 5 into the outer sheath pipe 6 as in the first embodiment. The openings 531, 631, and 71 are made to coincide with each other, but the O-ring 8 is previously placed on the outer periphery of the inner intubation tube 5 and disposed at the position of the mounting receiving portion 634, and the water stop ring plate 7 is attached to the sheath tube flange 63. Keep facing each other.

  Then, the nut 4a. 4b is screwed in advance, and the rod bolt 3 is inserted into the mounting holes 532, 632, 72 from the openings 531, 631, 71, and the cylindrical portion 41 of each nut 4a is connected to the mounting holes 532, 72 (or 632). The nuts 4a and 4b are screwed and tightened in a state of being tightly fitted inside, and the connecting projection 53 is clamped and fixed, and the facing sheath pipe flange 63 and the waterstop ring plate 7 are also clamped and fixed. . Accordingly, when the rod bolt 3 is mounted, a predetermined joint length can be fixed without requiring a bolt penetration operation for a long distance.

  Further, after the fixing, the connecting bolts and nuts 9 are inserted through the connecting through holes 633 and 73 and the O-ring 8 is tightened to realize a reliable seal between the inner tube 5 and the outer sheath tube 6. is there.

  In addition, this invention is not limited to the said embodiment, The structure of the seal | sticker mechanism part of the intubation pipes 1 and 5 and the outer sheath pipes 2 and 6 and the structure of a pipe connection part can be selected arbitrarily.

1, 5 .. Inner tube 11, 51 .. Tube body 12, 52.
121 .. engaging groove 122 .. seal housing groove 123 .. opening end notch 124 .. ring seal 13, 53.. Portions 2 and 6 · Outer sheath tubes 21 and 61 · Tube bodies 22 and 62 · · Tube connection portions 221 and 621 · · Connection tubes 222 · · Locking protrusions 622 · · Projections 23 · · Seal mechanism portions 231 ..Seal mounting recess 232 ..Coating cylinder portion 233 ..Ring seal 24 ..Connection projections 241, 631, 71 Openings 242, 632, 72 Mounting hole 63 ..Sheath tube flanges 633, 73. Through-hole 634 .. Installation receiving part 7. Water stop ring plate 8. O-ring 3. Bar bolts 4 a and 4 b. Nut 41.

Claims (3)

  Consists of an outer sheath tube and an inner intubation, the pipe connection length is adjusted by the insertion depth of the inner intubation, and a sealing mechanism portion is provided to seal the insertion portion, and each outer end of the outer sheath tube and the inner intubation The pipe length adjusting joint is provided with an appropriate pipe connecting portion, and a connecting projection for mounting a position fixing rod bolt is provided at an appropriate position on the outer peripheral surface of the outer sheath tube and the inner insertion tube. An opening through which the rod bolt can pass, a mounting hole that communicates with the opening and has a diameter larger than the width of the opening, and tightly fits the rod bolt mounted on the connecting protrusion into the mounting hole. A pipe length adjusting joint characterized by being clamped and fixed using a nut provided with a cylindrical portion.   The tube connection part of the inner intubation has a plug-and-rotate locking joint structure, and the tube connection part of the outer sheath tube is formed by surrounding a locking projection corresponding to the joint structure of the inner tube. The pipe length adjusting joint according to claim 1, wherein the seal mechanism is configured by providing packing on the inner peripheral surface of the inner end of the outer sheath pipe.   The sealing mechanism has a sheath pipe flange also serving as a connecting projection provided at the inner end of the outer sheath pipe, an O-ring disposed on the outer periphery of the inner tube, and a water stop that faces the sheath flange and clamps the O-ring. And a connecting through hole for the clamping pressure is provided around the sheath tube flange and the water stop ring plate at predetermined intervals, and the opening and mounting hole portion of the sheath tube flange are provided on the water stop ring plate. The pipe length adjusting joint according to claim 1, wherein an opening and a mounting hole corresponding to the above are provided.