JP2013024280A - Pipeline connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an offset yield strength in a pipeline connection structure where a pipeline end of one of connection target pipes A, B includes a sheath pipe 2 to which an insertion pipe 1 connected to a pipe end of the other connection target pipe A is inserted tightly, a lock projection part is formed in the insertion pipe 1, an engage recessed streak part 21 to engage the lock projection part 11 and an opening end notched part 24 which allows the lock projection part to enter the recessed streak part are formed on an inner peripheral surface in the vicinity of an end portion of the sheath pipe, and the lock projection part is positioned within the engage recessed streak part, thereby implementing pipe connection.SOLUTION: Lock projection parts 11, 12 are formed over a plurality of stages in such a manner that distances from end portions are different and angles of formation positions in the pipe outer periphery are different, and engage recessed streak parts 21, 22 are also formed over a plurality of stages. Between the front-side and deep-side engage recessed streak parts, a communication recessed part 25 is provided through which the lock projection part 11 can pass, at an angle corresponding to the formation angles of the lock projection parts, and the lock projection parts on the respective stages are engaged to the lock recessed streak parts on the respective stages, thereby performing pipe connection.

Description

  The present invention mainly relates to various alternative pipes used for waterworks and sewerage works, gas works, etc., temporary pipes temporarily installed for alternative pipes for pipe replacement work in factories, Further, the present invention relates to a pipe connection structure for forming pipes in various pipe pipes employed in factories.

  Various types of pipes are realized by appropriately connecting metal pipes having appropriate pipe diameters and lengths according to the use and installing desired pipes. And the connection of the metal pipes necessary for the pipe formation is formed by forming a shallow concave line that goes around the pipe in the vicinity of the edge of each metal pipe, and using a joint having a leg portion that engages with the concave line. It is what.

  Specifically, this joint acts on a ring-shaped seal (made of rubber), two half-moon shaped clamping rings (made of metal) positioned on the outer periphery of the seal, and a method for reducing the inner diameter of the clamping ring. The end faces of adjacent pipes to be connected are precisely aligned, and a ring-shaped seal is fitted over both adjacent pipes, and the metal ring is tightened by operating the tightening bolts. The seal is strongly pressed with a tightening metal ring, and the legs of the tightening metal ring are engaged with the recesses.

  The pipe connection requires an operation for precisely matching the end portions of the metal pipes, and the connecting operation also serves as a sealing operation with a seal, so that an accurate connecting operation is required. Therefore, it is not necessarily excellent in work efficiency. Therefore, the applicant of the present application provides a sheath pipe into which the other connection target pipe is tightly inserted at one end of the pipe to be connected, and forms a locking projection near the end of the other connection target pipe to be inserted, Formed on the inner peripheral surface in the vicinity of the end portion of the sheath tube is a recess that engages with the locking projection, and an opening end notch that allows the locking projection to advance into the recess, and the locking projection A ring seal that seals between the outer peripheral surface of the insertion tube and the inner peripheral surface of the sheath tube when the tube is positioned in the recess portion is built in the sheath tube, and the detachment of the locking protrusion on the sheath tube is prevented from occurring. A connection structure provided with a detachment prevention mechanism has been proposed (Patent Document 1: Japanese Patent Application Laid-Open No. 2002-250492).

  Further, when the opening end notch and the engaging recess facing the notch are used as a void as the improvement, the cavity recess is closed and the opening end notch is filled, and the sheath tube or the insertion is inserted. A coupling structure for mounting a resin mounting body having a locking structure to a pipe has been proposed (Patent Document 2: Japanese Patent Application Laid-Open No. 2003-176883).

JP 2002-250492 A. JP 2003-176883 A.

  In the pipe connection structure, the locking projection provided on the same outer circumference of one pipe (insertion pipe) is positioned in the concave section provided on the inner peripheral surface of the other pipe (sheath pipe). In this way, it acts as a stopper in the tube axis direction, and has an opening end notch for introducing the locking protrusion into the groove, and the locking protrusion and the groove The contact range (contact surface serving as a retaining resistance) is limited, and there is a limit to the retaining strength.

  In view of this, the present invention proposes an improvement of the pipe connecting structure with the above-mentioned retaining strength.

  In the pipe structure according to the present invention, a sheath pipe into which an insertion pipe connected to a pipe end of the other connection target pipe is closely inserted is provided at one pipe end of the connection target pipe. Are formed at a plurality of stages of locking projections that are different in distance from each other and have different angles of formation positions on the outer periphery of the pipe, and the plurality of stages of locking projections engage with the inner peripheral surface in the vicinity of the end of the sheath tube. A multi-stage engaging groove and a seal housing groove in the depth of the engaging groove are continuous with the engaging groove on the opening end side, and the locking protrusion protrudes from the opening end. The locking protrusion passes through an angle corresponding to the angle of formation of the locking protrusion between the opening end notch that can be advanced into the engaging groove on the side and the engaging groove adjacent to the front back. Provided with a communication recess made possible, the locking protrusions of each step can be engaged with the locking recesses of each step, and the locking protrusions on the end side are located in the innermost engagement recesses When you insert Kangaishu surface is characterized in that made so as to be sealed with a ring seal which is furnished to the seal housing concave portion.

  Thus, the locking projection on the foremost stage (end side) of the insertion tube is inserted from the opening end notch and is positioned in the foremost engagement recess, and the insertion tube (or sheath tube) is rotated. The foremost locking protrusion is moved from the opening end notch and moved to the position of the connecting recess. At this time, the next stage locking projection is located at a location facing the opening end notch. When the insertion tube is further pushed in, the next-stage locking projection is positioned in the foremost engaging groove from the opening end notch, and the front-stage locking projection is in the engagement of the next stage (viewed from the opening). Enter into the mating groove, rotate the insertion tube (or sheath tube) from the position, and operate the next step in the same way, and the foremost locking protrusion becomes the innermost engagement groove When positioned, the outer peripheral surface of the insertion tube is sealed with a ring seal incorporated in the seal housing recess, and the locking projections of each step are engaged with the exceptional engagement recesses. The pipe connection is realized with strong retaining strength against the axial direction.

  As described above, the present invention connects the insertion tube provided with the locking projection and the connection target tube provided with the sheath tube into which the insertion tube is tightly inserted, and performs pipe connection, A plurality of engaging protrusions are formed on the outer peripheral surface of the insertion tube, and a multi-stage engaging groove is formed on the inner peripheral surface in the vicinity of the end portion of the sheath tube. An opening end notch and a communication recess that allow the locking protrusions of each step to be sequentially advanced are formed, and the locking protrusions are multi-staged with the engaging recesses to increase the retaining strength, and the tube It increases the connection strength of the road.

Explanatory drawing (perspective view) before the connection of embodiment of this invention. It is explanatory drawing of the insertion pipe end part, (a) is a side view (b) is a partially cut front view. It is explanatory drawing of the same sheath pipe end part, (A) is a pipe axial direction sectional view (B) is an end view (C) is a sectional view taken along the line aa. Explanatory drawing of the connection operation (at the time of inserting the front-stage locking projection). The same figure (at the time of rotation after inserting the front locking protrusion). Explanatory drawing of the connection operation (when the next-stage locking projection is inserted). The same figure (at the time of rotation after inserting the next stage locking projection: pipeline connection state).

  Next, an embodiment of the present invention will be described. The pipe connection structure shown in the embodiment is an example in which the locking protrusion and the engaging recess are formed in two stages.

  The pipes A and B, which are the objects to be connected to form the pipe line, have the insertion pipe 1 and the sheath pipe 2 respectively integrated at their open ends (connection points) in advance by appropriate means such as welding or screwing. Therefore, in the embodiment of the present invention, in addition to the insertion tube 1 and the sheath tube 2, the ring seal 3 and the resin mounting body 4 are used.

  The insertion tube 1 is provided with front and rear locking projections 11 and 12 on the outer peripheral surface, and the front locking projection 11 and the rear locking projection (next locking projection) 12 are open ends. The distance from the part is different, and the formation angle is different.

  That is, the front-stage locking projection 11 has a length equal to or less than ¼ of the outer circumference (40 to 60 in the central angle) on the outer circumference circle at a position corresponding to the seal sealing circumferential surface described later and separated from the opening end. ) And an appropriate width (length in the direction of the tube axis) is provided at an opposing position of 180 degrees.

  Further, the rear-stage locking projection 12 is provided at a position shifted by 90 degrees with respect to the front-stage locking projection 11 and at an appropriate interval in the tube axis direction.

  The sheath tube 2 has an inner diameter into which the insertion tube 1 is substantially densely inserted, and the engagement recesses 21 and 22 at the front back corresponding to the front and rear locking projections 11 and 12 on the inner peripheral surface. In addition, a seal housing recess 23 is provided in the back of the back engagement recess 22. The seal housing recess 23 is provided with a ring seal 3 internally.

  Further, a part on the opening end side of the front engaging recess 21 is cut out to form an opening end notch 24. The opening end notch 24 has a shape and position of the locking projections 11 and 12. Correspondingly (provided at an opposing position of 180 degrees), the locking projections 11 and 12 can be advanced from the open end into the engaging recess 21 of the preceding stage.

  Further, the locking protrusions 11 and 12 can pass between the front engaging recess 21 and the back engaging recess 22 at a position shifted by 90 degrees from the position of the opening end notch 24. A communication recess 25 is provided.

  The resin mounting body 4 is formed in a U-shaped cross section, fills the opening end notch 24 and also fills the inside of the engaging groove 21 adjacent to the opening end notch 24, and the engagement groove 21 and the outer peripheral surface of the sheath tube 2 are sandwiched by their own elasticity.

  Further, a locking recess 26 is provided on the outer peripheral surface of the sheath tube 2 held by the resin mounting body 4, and a protrusion 41 is provided at a corresponding portion of the resin mounting body 4.

  Thus, after the distal end portion (insertion tube 1) of the connection target tube A is inserted into the sheath tube 2, the front-stage locking projection 11 is advanced from the opening end notch 24 into the front-stage engagement recess 21. (FIG. 4), it is rotated 90 degrees about the axial direction (FIG. 5).

  In the above-described state, the rear-stage locking projection 12 is a position facing the opening end notch 24, and the front-stage locking projection 11 in the front-engagement recess 21 is a position facing the connection recess 25. .

  When the connection target pipe A is further pushed in the above state, the rear-stage locking projection 12 passes through the opening end notch 24 and enters the front-stage engagement groove 21, and the front-stage engagement in the front-stage engagement groove 21. The stop protrusion 11 passes through the connection recess 25 and enters the back engagement recess 22, and the distal end portion of the sheath tube 1 is press-fitted into the ring seal 3 (FIG. 6).

  When the connection target tube A (sheath tube 1) is further rotated, the rear-stage locking projection 12 is shifted from the position of the opening end notch 24 and is positioned in the front-stage engagement groove 21 and the rear-stage engagement groove is formed. The front-stage locking projection 11 in 22 is displaced from the position of the connecting recess 25.

  When the resin mounting body 4 is mounted so as to simultaneously fill the voids of the open end notch 24 and the engaging recess 21 adjacent to the open end notch 24 (holding the sheath tube 2), the resin mounting The mounted state of the body 4 is maintained by its own elasticity and the locking of the locking recess 26 and the protrusion 41.

  Therefore, when the insertion tube 1 at the distal end of the connection target tube A is inserted into the sheath tube 2 at the distal end of the connection target tube B, rotated 90 degrees, further inserted, and rotated again, each of the front and rear stages The stop protrusions 11 and 12 are located in the respective engagement concave ridges 21 and 22 at the front and rear depths, become resistance in the tube axis direction (disconnection direction), and the connection target tubes A and B are connected to form a pipe line. It is what is done. In particular, the resistance force is twice as much as the resistance to pulling out compared to the conventional pipe connection by one line of engagement.

  Further, the rotation range of the insertion tube 1 is limited by the mounting of the resin mounting body 4, and the locking projection 12 does not reach the position of the open end notch 24, so that the pipes are not separated. However, if the resin mounting body 4 is detached, and the insertion tube 1 rotates for some reason (including natural disasters such as earthquakes), the locking projection 12 is accidentally positioned at the opening end notch 24. Even if a force acts in the tube axis direction, the front-stage locking projection 11 is locked to the front-stage engagement groove 21 and the tip of the connection target pipe A (insertion pipe 1) is completely connected to the other side. There is no disconnection from the connection target tube B (sheath tube 2).

  In addition, although the said embodiment showed the example of the latching protrusion of 2 steps | paragraphs front and back, it is good also as a 3 step | paragraph structure (however, it becomes pushing operation by 60 degree rotation). Of course, instead of the resin mounting body, other opening end notch closing mechanisms may be employed.

DESCRIPTION OF SYMBOLS 1 Insertion tube 11 Previous stage latching protrusion 12 Rear stage latching protrusion (next stage latching protrusion)
2 sheath tube 21 front engaging groove 22 deep engaging groove (back engaging groove)
23 Seal storing recess 24 Open end notch 25 Communication recess 26 Locking recess 3 Ring seal 4 Resin mounting body 41 Projection

Claims (3)

  A sheath pipe into which an insertion pipe connected to the pipe end of the other connection target pipe is closely inserted is provided at one pipe end of the connection target pipe, and the distance from the end is different from the end of the insertion pipe. A plurality of engaging protrusions having a plurality of engaging protrusions engaged with the inner peripheral surface in the vicinity of the end portion of the sheath tube. In addition, a seal housing groove is provided at the back of the engagement groove, and is continuous with the engagement groove on the opening end side, and the locking protrusion protrudes from the opening end into the engagement groove on the opening end side. Provided between the opening end notch portion that can be advanced and the engagement concave strip adjacent to the front back, at an angle corresponding to the formation angle of the locking projection, and a communication recess that allows the locking projection to pass through, When the locking protrusion of each step can be engaged with the locking groove of each step, and the locking protrusion on the end side is positioned at the innermost engagement groove, the outer peripheral surface of the insertion tube is Seal storage recess Pipe coupling structure characterized by comprising as the sealed decorated with ring seal parts.   When the engaging protrusion on the farthest end of the insertion tube is moved from the position of the opening end notch, and the engagement groove facing the opening end notch is made a space, the space recess 2. The pipe connection structure according to claim 1, wherein the pipe connection structure is formed by mounting a resin mounting body having a structure for locking to the sheath pipe or the insertion pipe, and filling the opening end notch.   The locking projection is formed in two steps, front and rear, the locking projection on the same step is formed at a position opposed to 180 degrees, and the locking projection on the front and rear stages is shifted by 90 degrees. The pipe connection structure according to claim 1 or 2, wherein the opening end notch part and the connection concave part are also shifted by 90 degrees at the back two stages.

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