JP5507902B2 - Pipe joint mechanism, pipe joint, pipe connection method using pipe joint, pipe connection and separation method using pipe joint, and piping structure - Google Patents

Description

    The present invention relates to connection of piping through which a fluid flows, and in particular, a pipe joint mechanism, a pipe joint, and a pipe joint that are applied to connection of pipes in various uses such as connection of piping for vacuum equipment and connection of pressurized piping are used. The present invention relates to a pipe connection method, a pipe connection and separation method using a pipe joint, and a piping structure.

JIS B 8365, JIS B 2290, and the like are known as general methods for connecting vacuum pipes.
Conventionally, in joints that connect pipes, pipes can be prevented from coming off by pressing them with a special tool when the pipes are inserted into the joints, or by deforming the pipes and joints at the same time. Methods have been devised, such as a method of biting installed metal claws into the pipe, and a mechanism for inserting a lock ball into the groove of the pipe.

  Patent Document 1 discloses a double press type pipe joint in which a pipe to be connected is inserted into a socket part of a joint pipe formed on a sleeve, elbow, tee, reducer, etc. An annular groove that bulges outward is provided on the inner peripheral side in the middle of the part, and an O-ring is mounted in the annular groove, and the O-ring has an outer diameter substantially equal to the inner diameter of the bottom of the annular groove. The inner diameter is substantially the same as the outer diameter of the connected pipe inserted into the socket portion, and the outer peripheral edge and a part of the inner peripheral edge are formed between the bottom of the annular groove and the outer surface of the connected pipe inserted. A concave portion in which a gap channel is formed, and a convex portion that is crushed by a connected pipe that is crushed and inserted by mounting in the annular groove on both sides thereof, and the outer shape of the cross section of the convex portion is an annular groove It is made into a roughly triangular shape along the inner shape of the cross section of the When the Tsu Doo portion and the connecting pipe are clamped simultaneously connected by the press tool at both sides two positions of the O-ring, double-press type pipe joint in which the gap flow passage is adapted to disappear have been disclosed.

  Further, Patent Document 2 discloses a joint body having an opening for inserting a pipe, a cylindrical shape having an inner diameter slightly larger than the outer diameter of the pipe, and a retaining piece holder that can move slightly in the direction of the joint body, A retaining piece attached to the notch portion of the retaining piece holder so that it can move slightly outwardly of the retaining piece holder and abuts the outer peripheral surface of the pipe to be connected, and is fitted to the retaining piece holder A retaining piece pressing member that presses the retaining piece in the direction of the tube core, and a tapered portion that decreases in diameter from the joint body side toward the tube passage hole at the end portion. A tapered outer tube that is locked to the joint body so as to abut against the holding piece presser. Tighten the screws so that they do not come off Without using a work or special tools other tools, pipe joint for metal pipes to realize the retained only by inserting it has been disclosed.

  In Patent Document 3, when the plug P is inserted into the inner cylinder and displaced backward, the outer cylinder is released from the control ball and displaced forward, and the lock ball is pushed radially inward by the outer cylinder to engage with the lock groove. When the plug P is locked in the connected state and the outer cylinder is displaced backward from the connected state, the inner cylinder is released from the control ball and displaced forward, and the lock ball is released from being held by the outer cylinder. Therefore, the plug P can be pulled out from the lock groove so that it can be retracted radially outward. When connecting the plug P, there is no need to displace the outer cylinder to the unlock position, A pipe joint with good operability has been disclosed because it only needs to be inserted into the tube and pushed.

Japanese Patent No. 3436822 JP 2006-105269 A JP 2000-352489 A

The above-mentioned JIS standard vacuum joints such as JIS B 8365 and JIS B 2290 not only significantly increase the outer diameter of the joint compared to the pipe diameter, but also tighten many bolts in the flange-type joint that is fixed with bolts. There is a need.
In the double press type pipe joint disclosed in Patent Document 1, the socket part and the connection pipe are connected to each other by simultaneously tightening and reducing the diameter with a press tool, so that the socket part and the connection pipe are inevitably deformed.

   In the pipe joint disclosed in Patent Document 2, the retaining piece is provided with an appropriate number of stages of sharp saw teeth that bite into the outer peripheral surface of the pipe to be connected. Strongly pressed against the outer peripheral surface. Therefore, scratches due to saw teeth are inevitably left on the outer peripheral surface of the pipe.

In the pipe joint that deforms or scratches the pipe as in the pipe joint disclosed in Patent Document 1 or Patent Document 2, the pipe once used cannot be used repeatedly. In a press-type fitting, when removing a pipe, it is necessary to cut the pipe.
In addition, these pipe joints can be sealed with liquid, but cannot be sealed with gas or vacuum.

  Furthermore, in the locking prevention by the lock ball of Patent Document 3, the mechanism is complicated because a lot of springs are used, and the joint itself is increased in size and cost, making it difficult to apply industrially, or lacking versatility.

  In view of the problems of the prior art as described above, the present invention is a pipe joint that can be connected simply by inserting a pipe, can be vacuum sealed or gas sealed, is inexpensive and safe, and can be configured compactly as a whole. An object is to provide a mechanism, a pipe joint, a pipe connection method using the pipe joint, a pipe connection and separation method using the pipe joint, and a pipe structure.

  The pipe joint mechanism of the present invention is a pipe joint mechanism having a connected pipe, a pipe joint, and a release, and is equipped with a stopper having elasticity that expands and contracts the diameter outside the end connected to the pipe joint of the connected pipe. The stopper has an annular portion whose inner diameter substantially matches the outer diameter of the connected pipe and a protruding edge portion protruding outward, and the pipe joint matches the outer diameter of the annular portion provided in the connected pipe. An airtight structure portion having an inner diameter of the size of the stopper, and a connection structure portion formed inside with a retaining groove into which the protruding edge portion of the stopper fits, and the connection structure portion includes a retaining groove and A through hole that penetrates from the outer surface side to the inner surface side of the connection structure portion, and the release has a substantially annular main body portion having an inner diameter that substantially matches the outer diameter of the connection structure portion, and this circle. An unlocking projection piece projecting inwardly from the annular body portion, and the annular body portion is The inner diameter is larger than the outer diameter of the structure part and the inner diameter substantially coincides with the outer diameter of the connection structure part, and the diameter of the unlocking protrusion can be freely reduced. It has the shape which can be inserted in.

  The annular part provided in the connected pipe may be a first annular part and a second annular part, and the stopper may be loosely fitted between the first annular part and the second annular part.

  The stopper may have a single-piece shape with a slit.

  You may form the protrusion edge part of a stopper by making the at least one side edge part of the said stopper comb shape.

  In addition, the pipe joint of the present invention has a connection structure portion continuous with an airtight structure portion having an inner diameter that matches the outer diameter of the connected pipe, and a circle having an inner diameter that substantially matches the outer diameter of the connected pipe. A retaining portion that has an annular portion and a protruding edge portion that protrudes outward, and has an elasticity that operates to expand and contract the diameter, and the protruding edge portion of the stopper that is attached to the connected pipe fits. A groove is formed on the inner side of the connection structure part, and a through-hole is formed having an intersection with the retaining groove and penetrating from the outer surface side to the inner surface side of the connection structure part. An annular main body portion that can be expanded and contracted to an inner diameter larger than the diameter and an inner diameter that substantially matches the outer diameter of the connection structure portion, and projects inwardly from the annular main body portion, and the retaining groove And an unlocking protrusion having a shape that can be inserted into the intersection with the through hole. Characterized in that it is in disengageable.

  In addition, the pipe connection and separation method using the pipe joint of the present invention includes the first step of loosely fitting the stopper to the connected pipe, and the pipe joint in a state where the diameter of the stopper loosely fitted to the connected pipe is reduced. The second step of inserting into the connection structure, the third step of fitting the protruding edge of the stopper into the retaining groove of the connection structure, and the outer surface of the tip of the connected pipe at the connection structure of the pipe joint A fourth step of closely contacting the inner surface of the airtight structure portion of the continuous pipe joint, and the third step and the fourth step are performed simultaneously to connect the pipe to be connected to the pipe joint, A fifth step of attaching the annular body part of the release to the outside of the connection structure part of the pipe joint in a state in which the diameter is increased so as to have an inner diameter larger than the outer diameter of the connection structure part of the pipe joint, and connection of the pipe joint At a position that matches the intersection of the through-hole formed in the structure with an intersection with the retaining groove The unlocking projection piece protruding inward from the annular main body portion is positioned, and the unlocking projection piece corresponding to the through hole is attached to the through hole by mounting the release annular main body portion outside the connection structure portion of the pipe joint. By inserting the unlocking protrusion piece into the intersection of the through hole with the retaining groove of the sixth hole that is inserted into the intersection with the retaining groove, the protruding edge of the stopper fitted into the retaining groove is A seventh step of pressing down by the unlocking projection piece to release the fitting to the retaining groove of the protruding edge of the stopper, and an eighth step of releasing the end of the connected pipe from the connection structure portion of the pipe joint, It is characterized by the following.

  In addition, the pipe structure of the present invention is a pipe structure in which a pipe joint is mounted on a connected pipe, and the pipe joint is continuous with an airtight structure portion having an inner diameter that matches the outer diameter of the connected pipe. And has a connecting structure part, an annular part having an inner diameter substantially matching the outer diameter of the pipe to be connected, and a protruding edge part protruding outward, and operates to expand and contract the diameter. A stopper groove mounted on the pipe to be connected is formed on the inner side of the connecting structure portion, and the connecting structure portion of the connecting structure portion has an intersection with the retaining groove. A through-hole penetrating from the outer side to the inner side is formed, and the inner diameter is larger than the outer diameter of the connection structure and the inner diameter substantially matches the outer diameter of the connection structure. An annular main body and an inward projection from the annular main body, and the intersection of the retaining groove and the through hole. A release having an unlocking protrusion having a shape that can be inserted into the part is detachable, and at least a part of the pipe joint and / or the connected pipe has a bellows structure. To do.

  The retaining groove is formed over the entire circumference in the inner circumferential direction of the connection structure portion, the through hole is a rectangular through hole, the axial direction of the pipe joint intersecting with the retaining groove and the longitudinal length of the rectangular through hole You may form the said cross | intersection part as a direction in which a direction corresponds.

  The annular main body portion has a circular end separation portion, the circular end separation portion is separated and expanded, and conversely, the circular end separation portion is closed and the separation end surface is brought into contact with the outside of the connection structure portion. The inner diameter larger than the diameter and the inner diameter substantially coincident with the outer diameter of the connection structure portion can be freely expanded and reduced.

  The pipe to be connected is one pipe and another pipe, and the pipe joint has an airtight structure part corresponding to the one pipe and the other pipe on a one-to-one basis and a connection structure part continuous to the airtight structure part. It may be.

[Action]
The pipe joint mechanism, pipe joint, pipe connection method using the pipe joint, pipe connection and separation method using the pipe joint, and piping structure of the present invention as described above. Is the intersecting part. In the state where the protruding edge of the stopper is fitted in the retaining groove, if the unlocking protrusion piece of the release is inserted through the intersection where the through hole and the retaining groove intersect, the protruding edge of the stopper is retained. The state of being fitted to can be released. In other words, if there is an intersection where the retaining groove and the through hole intersect, the unlocking projection piece is inserted into the intersecting portion, so that the protruding edge of the stopper is pushed down by the unlocking projection piece, and the protruding edge of the stopper Can be released from the state of being fitted in the retaining groove.

Therefore, the crossing portion is not limited to the case where the crossing is orthogonal, and may be any crossing where the retaining groove and the through hole cross, including the case where the crossing is orthogonal.
For example, when the longitudinal direction of the rectangular through hole does not coincide with the axial direction of the pipe joint, the through hole and the retaining groove are not orthogonal to each other. Further, even when the through hole is not a rectangular through hole but simply a hole, it can be said that the hole portion is an intersection.

  In addition, the unlocking projection piece of the release has an outer shape that substantially matches the inner shape of the through hole, so that the unlocking groove and the through hole intersect each other by inserting the unlocking projection piece inside the through hole. Thus, the unlocking projection piece can be inserted through and the state where the protruding edge of the stopper is fitted in the retaining groove can be reliably released.

The pipe joint mechanism, the pipe joint, the pipe connection method using the pipe joint, the pipe connection and separation method using the pipe joint, and the piping structure according to the present invention are inexpensive and safe, and are compact as a whole. be able to.
The pipe joint mechanism, pipe joint, pipe connection method using the pipe joint, pipe connection and separation method using the pipe joint, and the pipe structure according to the present invention can be used repeatedly without scratching the pipe. It is the same size as the pipe diameter and can be connected simply by inserting the pipe. Vacuum sealing and gas sealing are also possible.

The (a) side view and (b) sectional view of the pipe joint mechanism of one embodiment of the present invention 1 is an exploded sectional view of a pipe joint mechanism according to an embodiment of the present invention. The (a) exploded perspective view and (b) partial front view of the to-be-connected pipe which comprise the pipe joint mechanism of one embodiment of this invention The perspective view of the to-be-connected pipe which comprises the pipe joint mechanism of one embodiment of this invention (A) sectional view and (b) other sectional view of a pipe to be connected constituting the pipe joint mechanism of an embodiment of the present invention (A) perspective view and (b) partial enlarged front view of a pipe joint mechanism of an embodiment of the present invention (A) Another perspective view and (b) Other partial enlarged front view of the pipe joint mechanism of an embodiment of the present invention The perspective view which shows (a) one part as a notch end surface, and (b) partial enlarged front view of the pipe joint mechanism of one embodiment of this invention (A) Another perspective view showing a part of the pipe joint mechanism according to the embodiment of the present invention as a cut-out end surface, and (b) Another partially enlarged front view (A) Another perspective view and (b) Partial enlarged front view and (c) Other partial enlarged front view of the pipe joint mechanism of an embodiment of the present invention (A) Another perspective view showing a part of the pipe joint mechanism according to the embodiment of the present invention as a cut-out end surface, (b) Another partial enlarged front view, and (c) Still another partial enlarged front view (A) Still another perspective view showing a part of the pipe joint mechanism according to the embodiment of the present invention as a cut-out end surface, (b) Another partial enlarged front view, and (c) Still another partial enlarged front view Sectional drawing of piping structure of one embodiment of the present invention Sectional drawing of the piping structure of other embodiment of this invention

The form for implementing the pipe joint mechanism of this invention is demonstrated below with reference to drawings.
1A is a side view and FIG. 1B is a sectional view showing a state in which one pipe 2 and another pipe 3 are connected to each other by the joint mechanism 1 of the present invention. FIG. 2 also shows the separated state.
As shown in the figure, one pipe 2 and another pipe 3 are connected by a joint mechanism 1 so that a fluid such as a gas can be passed through the inside, and the inside and outside thereof are kept airtight. .

A pipe to be connected which is one pipe 2 or another pipe 3 and a pipe joint 20 and a release 30 of the joint mechanism 1 are configured.
A stopper 10 and an O-ring 11 that is an elastic seal material are attached to a connected pipe that is one pipe 2 or another pipe 3.

As shown in FIGS. 3 (a), 3 (b), 4 and 5 (a) (b), the stopper 10 has an annular portion 10a having an inner diameter that substantially matches the outer diameter of the pipe to be connected, and this annular ring. It comprises a protruding edge portion 10b that is formed integrally with the portion 10a and protrudes outward of the connected pipe. That is, the stopper 10 has a protruding edge portion 10b protruding outward, and at least one side edge portion is formed in a comb-teeth shape.
A slit 10c is formed in such a manner that a part of the annular portion 10a and the protruding edge portion 10b is cut out in series, and the stopper 10 is formed in a single-piece shape provided with the slit 10c. As a result, the stopper 10 has elasticity that operates so that the diameter of the slit 10c is increased or decreased. On the other hand, the O-ring 11 is elastically and airtightly attached to the outer surface of the connected pipe.

  The connected pipe that is one pipe 2 or another pipe 3 has a first annular portion 12 that protrudes outward over the entire outer periphery of the end portion, and in the same manner as the first annular portion 12. The second annular portion 13 is provided at a position in the distal direction of the pipe to be connected at a predetermined interval from the first annular portion 12. The distance between the first annular portion 12 and the second annular portion 13 is substantially the same as the width of the annular portion 10 a of the stopper 10. The outer surface of the tube to be connected between the first annular portion 12 and the second annular portion 13 is arranged to abut against the inner surface of the annular portion 10a of the stopper 10 and serves as a pressing portion 14 to be pressed.

As shown in FIGS. 1 and 2, the pipe joint 20 has a central portion 20a having an inner diameter that matches the outer diameter of the pipe to be connected, and a connection that is continuous with both ends of the central portion 20a and expands outward. The parts 20b and 20c are integrally formed. The inner diameters of the connecting portions 20b and 20c are set to coincide with the outer diameters of the first annular portion 12 and the second annular portion 13 provided in the connected pipe.
The connection portions 20b and 20c include an airtight structure portion 21 having an inner diameter whose size matches the outer diameter of the second annular portion 13 formed on the connected pipe on the inner surface. The hermetic structure portion 21 serves as a pressing surface of the O-ring 11 attached to the outer surface of the second annular portion 13 and the connected pipe. Further, the connection structure portion 22 is formed integrally with the airtight structure portion 21.

  A retaining groove in which the protruding edge portion 10b of the stopper 10 mounted on the pipe to be connected is fitted at a substantially intermediate position between the base end portion of the connecting structure portion 22 and the airtight structure portion 21 and the opening side end portion. 23 is formed over the entire circumference in the inner circumferential direction of the connection structure 22. The retaining groove 23 is formed as a non-through hole that does not penetrate between the inner and outer sides of the connection structure portion 22.

  Furthermore, four rectangular through holes 24 are formed in the connection structure portion 22 so as to extend in a direction coinciding with the axial direction of the pipe joint 20 and are arranged at equal intervals and in the same shape and size. Each rectangular through hole 24 is formed to have a crossing portion that intersects with the retaining groove 23 in the form of a through hole penetrating from the outer surface side to the inner surface side of the connection structure portion 22.

  As shown in FIGS. 6A and 6B, the release 30 has a substantially annular main body portion 31 having an inner diameter substantially matching the outer diameter of the connection structure portion 22, and projects inward from the annular main body portion 31. It has four unlocking projection pieces 32. The four unlocking protrusions 32 extend from one end of the release 30 in a direction coinciding with the axial direction of the annular main body 31, and are arranged at the same shape and size at equal intervals. Further, the four unlocking protrusions 32 are formed in an outer shape substantially matching the inner rectangular shape of the rectangular through hole 24 formed in the connection structure portion 22 of the pipe joint 20.

  The annular main body portion 31 of the release 30 is not a complete annular shape, and a slit-shaped circular end separation portion 33 is formed in a part thereof. Therefore, as shown in FIG. 6 (b), when the circular end separating portion 33 is closed and connected, it is substantially annular, and when the circular end separating portion 33 is expanded, it is not a complete annular shape. The diameter of the connection structure portion 22 is increased so as to have an inner diameter larger than the outer diameter of the connection structure portion 22.

Next, the operation of connecting the one pipe 2 and the other pipe 3 in an airtight manner and the operation of disconnecting the connection between the one pipe 2 and the other pipe 3 connected in an airtight manner by the joint mechanism 1 of the above embodiment. explain.
First, as shown in FIG. 3, FIG. 4 and FIG. 5, the pipe to be connected, which is one pipe 2 or another pipe 3, has a first annular portion 12 and a second annular portion 13 at its end. The stopper 10 is mounted between the O-rings 11 and the O-ring 11 is mounted so as to be in close contact with the side wall in the distal direction of the second annular portion 13.
Since the stopper 10 has a split shape in which a slit 10c is formed in a manner in which a part of the annular portion 10a and the protruding edge portion 10b is cut out in series, the first annular portion 12 and the second annular portion 13, the inner surface of the annular portion 10 a of the stopper 10 is not in close contact with the outer surface pressing portion 14 of the connected pipe, and the first surface as shown in FIG. The state is loosely fitted between the first annular portion 12 and the second annular portion 13.

Next, as shown in FIGS. 7 to 9, the pipe joint 20 is attached to the end portion where the O-ring 11 of the pipe to be connected which is one pipe 2 or another pipe 3 is attached.
First, as shown in FIG. 8, an airtight structure portion in which an end portion where the O-ring 11 of the pipe to be connected is attached to the opening portion of the connection portion 20 b of the pipe joint 20 or the connection structure portion 22 of the connection portion 20 c continues from the connection structure portion 22. 21 Insert toward the inner surface. In the insertion process, the stopper 10 loosely fitted between the first annular portion 12 and the second annular portion 13 of the pipe to be connected is contracted with the slit 10c closed as shown in FIG. 8B. It becomes a diameter state. In this state, the protruding edge portion 10 b of the stopper 10 slides in the direction of the airtight structure portion 21 while contacting the inner surface of the connection structure portion 22.

  Thereafter, when the position of the protruding edge portion 10b of the stopper 10 reaches the position of the retaining groove 23 formed on the inner side surface of the connection structure portion 22, the diameter of the stopper 10 is increased, and the protruding edge portion 10b is formed inside the connection structure portion 22. It fits into a retaining groove 23 formed as a non-through hole that does not penetrate between the outer sides. At that time, as shown in FIG. 9B, the stopper 10 is in a state where the diameter is expanded in a state where the slit 10c is expanded. Further, at that time, for example, sound repellent and response that can be heard as a sound such as “click” occurs, and it is recognized that the protruding edge portion 10 b of the stopper 10 is fitted in the retaining groove 23. At the same time, the O-ring 11 and the second ring are mounted so that the outer surface of the distal end of the pipe to be connected comes into contact with the inner surface of the central portion 20a of the pipe joint 20 and is in close contact with the side wall in the distal direction of the second annular portion 13. The outer surface of the annular portion 13 is in close contact with the inner surface of the airtight structure portion 21 of the pipe joint 20 that continues from the connection structure portion 22.

In the above process, the fitting of the pipe joint 20 to the connected pipe end is completed as shown in FIG. 9, and one pipe 2 and another pipe 3 are connected by the joint mechanism 1 as shown in FIG. It becomes a state.
Next, the one pipe 2 and the other pipe 3 connected by the joint mechanism 1 are separated by the procedure shown in FIGS.
First, as shown in FIG. 10B, the release 30 is expanded so that the circular end separation portion 33 is expanded, so that the inner diameter is larger than the outer diameter of the connection structure portion 22 of the pipe joint 20. In this state, the annular main body portion 31 of the release 30 is attached to the outside of the connection structure portion 22 of the pipe joint 20.

  When the release 30 is attached to the outside of the connection structure portion 22 of the pipe joint 20, it protrudes inward from the annular main body portion 31 at a position coinciding with the rectangular through hole 24 formed in the connection structure portion 22 of the pipe joint 20. As shown in FIGS. 11 (a) and 11 (b), the four unlocking projection pieces 32 are positioned and the annular main body portion 31 of the release 30 is attached to the outside of the connection structure portion 22 of the pipe joint 20. Each unlocking protrusion 32 corresponding to the rectangular through hole 24 is fitted.

  By fitting each unlocking protrusion 32 having a shape corresponding to each rectangular through-hole 24 as described above, each rectangular through-hole 24 penetrates from the outer surface side to the inner surface side of the connection structure portion 22. Since it has a crossing portion intersecting with the retaining groove 23 formed around the inside of the connection structure portion 22 in the form of a hole, the protruding edge portion of the stopper 10 fitted in the retaining groove 23 10b is pushed down by each unlocking projection piece 32, the fitting of the protruding edge portion 10b of the stopper 10 to the retaining groove 23 is released, and the stopper 10 is reduced in diameter in a state where the slit 10c is closed. The state of the change is shown as a change from FIG. 10 (c) to FIG. 11 (c).

  Next, while maintaining the state shown in FIG. 11, as shown in FIG. 12, the end where the O-ring 11 of the connected pipe is attached is detached from the connection structure portion 22 of the pipe joint 20, and connected by the joint mechanism 1. Separation of the one pipe 2 in the state and the other pipe 3 is completed.

FIG. 13 shows an embodiment of the piping structure of the present invention, in which one piping 3 connected in an airtight manner by the joint mechanism 1 has a bellows structure 3a. When the pipe 3 has the bellows structure 3a, functions such as heat insulation or flexibility can be imparted to the pipe 3.
FIG. 14 shows another embodiment of the piping structure of the present invention, in which the pipe joint 20 has a central portion 20a having a bellows structure. Functions such as heat insulation or flexibility can be imparted to the pipe joint 20 by the pipe joint 20 having the central portion 20a having the bellows structure.

DESCRIPTION OF SYMBOLS 1 ... Joint mechanism, 2, 3 ... Pipe, 3a ... Bellows structure, 10 ... Stopper, 10a ... Ring part, 10b ... Projection edge part, 10c ...・ Slit, 11 ... O-ring, 12 ... first annular portion, 13 ... second annular portion, 14 ... pressing portion, 20 ... pipe joint, 20a ... central portion 20b, 20c ... connection part, 21 ... airtight structure part, 22 ... connection structure part, 23 ... retaining groove, 24 ... rectangular through hole, 30 ... release, 31 ... Annular body part, 32 ... Unlocking projection piece, 33 ... Circular end separation part.

Claims (17)

A pipe joint mechanism having a connected pipe, a pipe joint, and a release;
A stopper having elasticity that expands and contracts is attached to the outer side of the end connected to the pipe joint of the connected pipe, and the stopper protrudes outward from the annular part whose inner diameter substantially matches the outer diameter of the connected pipe. And a protruding edge that
The pipe joint is a connection structure in which an airtight structure part having an inner diameter that matches the outer diameter 557754 of the annular part provided in the pipe to be connected, and a retaining groove in which the protruding edge part of the stopper fits are formed. And
Have
The connection structure part has a crossing portion with a retaining groove and forms a through-hole penetrating from the outer surface side to the inner surface side of the connection structure part,
The release has a substantially annular main body portion having an inner diameter substantially coinciding with the outer diameter of the connection structure portion, and an unlocking protrusion piece protruding inward from the annular main body portion,
The annular main body portion can be freely expanded and reduced to an inner diameter larger than an outer diameter of the connection structure portion and an inner diameter substantially coinciding with the outer diameter of the connection structure portion,
The unlocking projection piece has a shape that can be inserted into the intersection of the retaining groove and the through hole. The said annular part provided in the to-be-connected pipe is a 1st annular part and a 2nd annular part, The said stopper is loosely fitted between the 1st annular part and the 2nd annular part. Pipe fitting mechanism. The retaining groove is formed over the entire circumference in the inner circumferential direction of the connection structure portion, the through hole is a rectangular through hole, the axial direction of the pipe joint intersecting with the retaining groove and the longitudinal length of the rectangular through hole The pipe joint mechanism according to claim 1 or 2, wherein the intersecting portion is formed as a direction in which directions coincide with each other. The pipe joint mechanism according to any one of claims 1 to 3, wherein the unlocking protrusion piece has an outer shape substantially coinciding with an inner shape of the through hole. The annular main body portion has a circular end separation portion, the circular end separation portion is separated and expanded, and conversely, the circular end separation portion is closed and the separation end surface is brought into contact with the outside of the connection structure portion. The pipe joint mechanism according to any one of claims 1 to 4, wherein the inner diameter is larger than the diameter and the inner diameter substantially coincides with the outer diameter of the connection structure portion so that the diameter can be increased and reduced. The pipe to be connected is one pipe and another pipe, and the pipe joint has a one-to-one correspondence between the one pipe and the other pipe, and a connection structure part continuous to the air-tight structure part. The pipe joint mechanism according to any one of claims 1 to 5. The pipe joint mechanism according to any one of claims 1 to 5, wherein the stopper has a one-piece shape with a slit. The pipe joint mechanism according to any one of claims 1 to 7, wherein the protruding edge portion of the stopper is formed such that at least one side edge portion of the stopper has a comb shape. Having a connection structure portion continuously with an airtight structure portion having an inner diameter of a size corresponding to the outer diameter of the connected pipe,
The protruding edge portion of the stopper having an annular portion having an inner diameter substantially coincident with the outer diameter of the connected pipe, and a protruding edge portion protruding outwardly, and having elasticity that operates to expand and contract the diameter. Is formed on the inner side of the connection structure,
Forming a through hole having an intersection with the retaining groove and penetrating from the outer surface side of the connection structure portion to the inner surface side;
An annular main body that can be expanded and contracted to an inner diameter larger than the outer diameter of the connection structure section and an inner diameter that substantially matches the outer diameter of the connection structure section, and projects inward from the annular main body section. A pipe joint having a release comprising an unlocking projection piece having a shape that can be inserted into the intersection of the retaining groove and the through hole. The retaining groove is formed over the entire circumference in the inner circumferential direction of the connection structure portion, the through hole is a rectangular through hole, the axial direction of the pipe joint intersecting with the retaining groove and the longitudinal length of the rectangular through hole The pipe joint according to claim 9, wherein the intersecting portion is formed as a direction in which directions coincide with each other, and the unlocking projection piece has an outer shape substantially matching an inner shape of the rectangular through hole. The pipe to be connected is one pipe and another pipe, and the pipe joint has a one-to-one correspondence between the one pipe and the other pipe, and a connection structure part continuous to the air-tight structure part. Item 10. The pipe joint according to item 9 or 10. A first step of loosely fitting a stopper to the connected pipe;
A second step of inserting the stopper loosely fitted in the connected pipe into the connecting structure portion of the pipe joint in a reduced diameter state;
A third step of fitting the protruding edge of the stopper into the retaining groove of the connection structure,
A fourth step of bringing the outer surface of the tip of the connected pipe into intimate contact with the inner surface of the airtight structure of the pipe joint continuous from the connection structure of the pipe joint;
Have
The third step and the fourth step are performed at the same time to connect to the pipe joint of the connected pipe,
A fifth step of attaching the annular body part of the release to the outside of the connection structure part of the pipe joint in a state where the diameter is expanded so as to have an inner diameter larger than the outer diameter of the connection structure part of the pipe joint;
An unlocking projection piece that projects inward from the annular main body portion is positioned at a position that coincides with the intersecting portion of the through-hole formed in the connecting structure portion of the pipe joint having the intersecting portion with the retaining groove, A sixth step of inserting the unlocking protrusion corresponding to the through hole into the intersection with the retaining groove of the through hole by mounting the annular body part of the release on the outside of the connection structure part of the pipe joint;
By inserting the unlocking projection piece into the intersection of the through hole with the retaining groove, the protruding edge of the stopper fitted in the retaining groove is pushed down by the unlocking projection piece, and the protruding edge of the stopper is prevented from coming off. A seventh step of releasing the fitting to the groove;
An eighth step of detaching the end of the connected pipe from the connection structure of the pipe joint;
A method for connecting and disconnecting pipes using a pipe joint, comprising: The retaining groove is formed over the entire circumference in the inner circumferential direction of the connection structure portion, the through hole is a rectangular through hole, the axial direction of the pipe joint intersecting with the retaining groove and the longitudinal length of the rectangular through hole Connecting the pipe using the pipe joint according to claim 12, wherein the intersecting portion is formed as a direction that coincides with the direction, and the unlocking projection piece has an outer shape that substantially matches the inner shape of the rectangular through-hole. Separation method. The annular body part has a circular end separation part in a part thereof, the circular end separation part is separated and expanded, and conversely, the circular end separation part is closed and connected, whereby the outer diameter of the connection structure part The pipe connection using the pipe joint according to claim 12 or 13, wherein the annular main body portion can be expanded and contracted freely to a larger inner diameter and an inner diameter substantially coincident with an outer diameter of the connection structure section. Separation method. A pipe structure in which a pipe joint is attached to a connected pipe,
The pipe joint has a connection structure portion continuously with an airtight structure portion having an inner diameter that matches the outer diameter of the connected pipe,
Attached to the pipe to be connected with an annular part having an inner diameter almost equal to the outer diameter of the pipe to be connected and a protruding edge part protruding in the outward direction and operating to expand and reduce the diameter. A stopper groove that fits the protruding edge of the stopper to be formed is formed inside the connection structure,
Forming a through hole having an intersection with the retaining groove and penetrating from the outer surface side of the connection structure portion to the inner surface side;
An annular main body that can be expanded and contracted to an inner diameter larger than the outer diameter of the connection structure section and an inner diameter that substantially matches the outer diameter of the connection structure section, and projects inward from the annular main body section And a release having an unlocking protrusion having a shape that can be inserted into the intersection of the retaining groove and the through hole is made detachable,
A pipe structure characterized in that at least a part of the pipe joint and / or connected pipe has a bellows structure. The retaining groove is formed over the entire circumference in the inner circumferential direction of the connection structure portion, the through hole is a rectangular through hole, the axial direction of the pipe joint intersecting with the retaining groove and the longitudinal length of the rectangular through hole The piping structure according to claim 15, wherein the intersecting portion is formed as a direction that coincides with the direction, and the unlocking projection piece has an outer shape that substantially matches the inner shape of the rectangular through hole. The pipe to be connected is one pipe and another pipe, and the pipe joint has a one-to-one correspondence between the one pipe and the other pipe, and a connection structure part continuous to the air-tight structure part. Item 17. The piping structure according to Item 15 or 16.

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