JP2008095814A - Pipe connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe connection structure for improving pipe connecting workability. <P>SOLUTION: An annular fastening plate 4 is interposed between both flanges 3, 3. A plurality of engaging pins 5 having engaging protruded portions 52 at the front ends of shaft portions 51 are protruded on both faces of the fastening plate 4. Both flanges 3, 3 have insertion holes 31 through which the engaging pins 5 can be inserted, and circular oblong holes 32 ranging from the insertion holes 31 so that the shaft portions 51 of the engaging pins 5 inserted through the insertion holes 31 are rotationally movable in the circumferential direction. In the faces on the opposite sides to the opposed faces of both flanges 3, 3, tapered engaging grooves 33 are formed along the circular oblong holes 32, with which the engaging protruded portions 52 of the engaging pins 5 can engage gradually shallow as parting farther from the insertion holes 31. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe connection structure.

Conventionally, as a pipe connection structure, a structure in which a fastening flange provided at a connection end portion of both pipes is connected by fastening with a plurality of bolts and nuts is known (for example, see Patent Document 1). .
JP-A-11-336540.

  However, in the pipe connection structure of the conventional example, it is necessary to screw and fasten a plurality of bolts and nuts with a tool such as a spanner. Therefore, much labor and labor are required for the pipe connection work or separation work. There is a problem that workability is bad.

  The problem to be solved by the present invention is to provide a pipe connection structure capable of improving the workability of pipe connection.

In order to solve the above-described problem, the pipe connection structure according to claim 1 is configured such that flanges are fixed in the vicinity of the pipe ends of both pipes to be connected, and the pipe ends of both pipes are connected by fixing the flanges together. A pipe connection structure,
An annular fastening plate is interposed between the flanges,
A plurality of engaging pins each having an engaging protrusion at the tip of the shaft are formed on both surfaces of the fastening plate.
The both flanges are formed with insertion holes through which the engagement pins can be inserted, and arc-shaped elongated holes that can rotate in the circumferential direction around the shaft portions of the engagement pins inserted through the insertion holes. Formed continuously in the hole,
A taper-like engagement groove which can engage with an engagement protrusion of the engagement pin along the arc-shaped elongated hole and which becomes shallower as the distance from the insertion hole is formed on the surface opposite to the opposed surface of the both flanges. The feature is that it is formed.

  In the pipe connection structure of the present invention, since the above-described configuration is adopted, an annular fastening plate is interposed between both flanges, and a plurality of engaging pins formed to protrude on both surfaces of the fastening plate are provided. When the fastening plate is rotated in the direction in which the arcuate elongated hole is formed after being inserted into the insertion holes formed in both flanges, the engaging protrusion of the engaging pin is brought into contact with the bottom of the tapered engaging groove. Since the shaft part rotates and moves along the circular hole in the engaged state, both flanges are drawn toward the fastening plate along the tapered surface of the tapered engagement groove. The parts can be connected and fixed in a state where the parts are pressed against each other.

  As described above, both pipes can be firmly connected only by an operation of rotating the fastening plate, whereby the workability of pipe connection can be improved. In addition, the connection state of both pipes can be cancelled | released only by rotating a fastening plate to a reverse direction.

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

  The pipe connection structure of the first embodiment corresponds to the invention described in claims 1 to 3.

  First, the pipe connection structure of the first embodiment will be described with reference to the drawings.

  1 is a longitudinal sectional view showing a pipe connection structure of the first embodiment, FIG. 2 is a view as seen from an arrow A in FIG. 1, FIG. 3 is a view as seen from an arrow B in FIG. 1, and FIG. FIG. 5 is an exploded perspective view showing the pipe connection structure of the first embodiment.

  The pipe connection structure includes a pair of pipes 1 and 2, flanges 3 and 3, and a fastening plate 4.

  More specifically, as shown in FIG. 1, an annular protrusion 11 having an outward cross-sectional mountain shape is formed at the pipe end of one pipe 1, and an annular protrusion at the pipe end of the other pipe 2. A flare 21 that is expanded outward is in contact with the end portion side slope 11a.

  The flanges 3 and 3 are fixed to the outer circumferences of the ends of the pipes 1 and 2 by welding.

  The fastening plate 4 serves to draw and fasten the flanges 3 and 3 together, and has a disc shape having a hole 41 through which a connecting portion formed by the annular protrusion 11 and the flare 21 can be inserted. And is interposed between the flanges 3 and 3.

  Further, as shown in FIG. 5, the fastening plate 4 has engaging pins 5 projectingly formed on both surfaces thereof at two places in the circumferential direction. The engagement pin 5 is provided with an engagement protrusion 52 having a diameter larger than that of the shaft portion 51 at the tip of the shaft portion 51.

  On the other hand, as shown in FIGS. 2 to 5, both the flanges 3, 3 are formed with insertion holes 31, 31 through which both the engagement pins 5, 5 can be inserted, and are inserted into the respective insertion holes 31. An arc-shaped elongated hole 32 that can rotate and move in the circumferential direction on the shaft portion 51 of the engaging pin 5 is formed continuously from the insertion hole 31.

  Further, the engaging projection 52 of the engaging pin 5 can be engaged with the surface opposite to the opposing surface of the flanges 3 and 3 along the arc-shaped elongated hole 32 and becomes shallower as the distance from the insertion hole 31 increases. Tapered engagement grooves 33 are respectively formed.

As shown in FIGS. 1 to 3, the fastening plate 4 extends along the outer peripheral surface of the fastening plate 5 as a rotation operation protrusion 41 protruding from the outer peripheral surfaces of the flanges 3 and 3 on the outer peripheral surface thereof. It is composed of a large number of protrusions formed like gear teeth.

  Next, operations and effects of the first embodiment will be described.

  Since the pipe connection structure according to the first embodiment is configured as described above, an annular fastening plate 4 is interposed between the flanges 3 and 3 so that the fastening plate as shown by a chain line in FIG. As shown by the chain lines in FIG. 4, the engagement pins 5 that are formed to project at two locations on both sides of the four are inserted into the insertion holes 31 formed in the flanges 3 and 3, and are then indicated by arrows in FIG. 2. As described above, when the fastening plate 4 is rotated in the direction in which the arc-shaped elongated hole 32 is formed, the engagement protrusion 52 of the engagement pin 5 is engaged with the bottom of the tapered engagement groove 33 in the shaft. Since the portion 51 rotates and moves along the circular hole 32, the flanges 3 and 3 are drawn toward the fastening plate 4 along the tapered surface of the tapered engagement groove 33. The pipe end connection parts (annular protrusion 11 and flare 21) are pressed against each other. It can be connected and fixed to state.

  Thus, since both pipes 3 and 3 can be firmly connected only by operation which rotates the fastening plate 4, the effect that the workability | operativity of pipe connection can be improved is acquired.

  In addition, the connection state of both the pipes 3 and 3 can be easily cancelled | released only by rotating the fastening plate 4 to a reverse direction.

  Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.

  For example, in the embodiment, the rotation operation protrusion 41 protruding from the outer peripheral surface of the fastening plate 4 is constituted by a number of protrusions formed in the shape of gear teeth along the outer peripheral surface of the fastening plate 5. However, the shape is arbitrary and it is sufficient that the rotation operation can be performed with a hand or a tool.

  Moreover, the shape of the engaging protrusion in the engaging pin 5 is arbitrary. Moreover, if the number is also plural, it is not limited to two.

  In addition, the pipe line which is the object of the present invention is not limited to water pipes and the like and can be applied to any pipe lines such as various plant pipes and ship pipes. The combination with connection is arbitrary.

It is a longitudinal cross-sectional view which shows the pipe connection structure of Example 1. It is A arrow directional view of FIG. It is a B arrow line view of FIG. It is sectional drawing in the CC line of FIG. It is a disassembled perspective view which shows the pipe connection structure of Example 1. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe 11 Annular protrusion 11a Pipe end side slope 2 Pipe 21 Flare 3 Flange 31 Insertion hole 32 Arc-shaped long hole 33 Tapered engagement groove 4 Fastening plate 41 Rotation operation protrusion 5 Engagement pin 51 Shaft part 52 Engagement Collision

Claims (3)

A pipe connection structure in which flanges are respectively fixed in the vicinity of the pipe ends of both pipes to be connected, and the pipe ends of both pipes are connected by connecting and fixing the flanges,
An annular fastening plate is interposed between the flanges,
A plurality of engaging pins each having an engaging protrusion at the tip of the shaft are formed on both surfaces of the fastening plate.
The both flanges are formed with insertion holes through which the engagement pins can be inserted, and arc-shaped elongated holes that can rotate in the circumferential direction around the shaft portions of the engagement pins inserted through the insertion holes. Formed continuously in the hole,
A taper-like engagement groove which can engage with the engagement protrusion of the engagement pin along the arc-shaped elongated hole and which becomes shallower as the distance from the insertion hole is formed on the surface opposite to the opposed surface of the both flanges. A pipe connection structure characterized by being formed.   2. The pipe connection structure according to claim 1, wherein a protrusion for rotation operation protruding from an outer peripheral surface of each of the flanges is formed on an outer peripheral surface of the fastening plate.   3. The pipe connection structure according to claim 2, wherein the protrusion for rotation operation is configured by a plurality of protrusions formed in a gear tooth shape along an outer peripheral surface of the fastening plate. Pipe connection structure.

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