JP4683206B2 - How to remove fittings and piping - Google Patents

Description

    The present invention relates to a pipe joint having a connection mechanism for pipes such as a hose and a tube, and a pipe removing method.

    Conventionally, a pipe joint having a mechanism for holding a hose with a gripper has been used for piping through which fluid such as oil, water, air, etc. flows (see, for example, Patent Document 1).

As shown in FIG. 10, the conventional pipe joint has a device connecting thread at the end, and pressurizes the holding member 103 (gripper) gripped in the joint body 102 on the surface of the pipe 101 (hose or tube). Thus, the pipe 101 is connected to and held by the connecting portion on the equipment side to prevent disconnection during use. When the pipe 101 is pulled out after use, the holding member 103 is expanded from the inside of the holding member 103 by the release member 104 (release) in the direction of the device connecting screw, and the biting into the pipe 101 is performed. By releasing, the pipe 101 can be easily pulled out from the pipe joint. That is, the pipe 101 can be removed whenever necessary.
JP 2003-314765 A

    However, even with the conventional pipe joint structure that allows the pipe to be removed, there are concerns about problems such as fluid leakage and pipe disconnection due to careless removal operation. Therefore, in consideration of safety, it is desirable to have a structure in which piping can be removed only when necessary. Further, since the above-mentioned trouble is concerned even when the removal work is inaccurate, it is desired to make it possible to know the work history as to whether or not the removal work has been performed in the past. .

    The present invention has been made to solve the above-described problems. In a pipe joint that holds a pipe with a holding member (gripper) held in the joint body, the hose cannot be always removed. It is an object of the present invention to provide a pipe joint and a pipe removing method that enables pipes to be removed only when necessary.

    It is another object of the present invention to provide a pipe joint and a pipe removing method that can keep a history of pipe removal work in the past.

    In order to achieve the above object, a pipe joint of the present invention is attached to a joint main body, a holding member for gripping a pipe within the joint main body, and an end of the joint main body on the pipe insertion side. And a sleeve that is detachable and prevents attachment of a tool for removing the pipe.

    In addition, the pipe joint of the present invention is attached to the joint main body, a holding member for gripping the pipe within the joint main body, and an end of the joint main body on the pipe insertion side, and remains remaining on the joint main body when separated. It has a sleeve constituted by a sleeve, a separation sleeve separated from the joint main body, and an arm part integrally formed with the remaining sleeve and the separation sleeve.

Further, at least a part of the arm portion is narrow so that the destruction at the time of separation is easy, and the removal history of the pipe can be known by the presence or absence of the destruction of the arm portion. The pipe removing method includes a joint body, a holding member that grips the pipe within the joint body, and a pipe insertion side end of the joint body that is attachable to and detachable from the joint body. A method of removing a pipe connected using a pipe joint having a sleeve for preventing the removal of the tool to be removed, the step of removing the sleeve, and inserting the pipe removal tool into the space that existed before the sleeve was removed And it has the process of pulling apart the said holding member from the surface of the said piping, and the process of pulling out the said piping from the said holding member, It is characterized by the above-mentioned.

    Furthermore, the pipe removing method includes a joint main body, a holding member for gripping the pipe within the joint main body, and a remaining sleeve that is attached to the pipe insertion side end of the joint main body and remains in the joint main body when separated. A pipe connected using a pipe joint composed of a separation sleeve separated from the joint body and an arm portion integrally formed with the remaining sleeve and the separation sleeve. Separating the separation sleeve of the sleeve; inserting a pipe removal tool into a space that existed before the separation sleeve was removed; and pulling the holding member away from the surface of the pipe; And a step of pulling out the pipe from the holding member.

    According to the pipe joint and the pipe removing method of the present invention, the pipe connecting port is opened by removing the sleeve covering the pipe connecting port of the pipe fitting when necessary, and the pipe is removed using a dedicated pipe removing tool. Therefore, troubles of inadvertent removal can be prevented. In addition, in the case of a sleeve composed of a separation sleeve and a remaining sleeve, it is possible to know the history of the removal work at least once due to the destruction of the arm connecting the separation sleeve and the remaining sleeve, and the removal work is accurate. It can be used to investigate the cause of troubles such as whether or not there was.

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

    1 to 3 are views showing an embodiment of a pipe joint according to the present invention. FIG. 1 is a half cross-sectional view of a pipe joint with no pipe (hose) 1 attached thereto, and FIG. 2 is a half cross-sectional view of the pipe joint with the pipe 1 attached thereto. FIG. 3 shows a perspective view of the sleeve 3 attached to the end of the joint body 2.

    The pipe joint according to the embodiment includes a synthetic resin cylindrical holding member (gripper) 4 that holds the synthetic resin pipe 1 in the joint body 2, and an outer cylinder portion that covers the holding member 4 with a predetermined gap ( Socket) 8 and a synthetic resin sleeve 3 attached to the end of the outer cylinder portion 8 of the joint body 2 on the pipe connection port side.

    As shown in FIG. 1, the holding member 4 has a plurality of slits 5 alternately formed from the front and rear at the end on the pipe connection port side and the end on the back side. The diameter is made possible. A plurality of annular projection bands 6 project from the inner peripheral surface of the holding member 4 in the direction of the pipe insertion direction so as to bite into the outer peripheral surface of the inserted pipe 1 and hold it firmly. .

    When the holding member 4 and the inserted pipe 1 are moved together in the pulling direction during use, the annular protrusion band 6 of the holding member 4 follows the tapered surface 7 (tapered inclined surface) in the joint body 2. The diameter is reduced to act on the pipe 1. Therefore, the holding member 4 presses the outer peripheral surface of the pipe 1 as a whole, tightens it, and tightens the pipe 1 firmly.

    Moreover, the sleeve 3 is attached to the end of the joint body 2 on the pipe connection port side of the outer cylinder part 8, and covers the pipe connection port at the tip of the outer cylinder part 8 in use and removes the pipe 1. The shape cannot be inserted with a dedicated tool. As shown in FIGS. 2 and 3, the sleeve 3 that realizes this includes a press-fit portion 9 that is press-fitted into the inner peripheral portion of the distal end of the outer cylindrical portion 8, and a groove portion 10 that is located at the outer peripheral portion of the distal end of the outer cylindrical portion 8. The press-fitting portion 9 and the fitting portion 11 are integrated with each other by, for example, two thin arm portions 12.

    The press-fitting portion 9 is formed with a projection surface 13 facing the outside of the tip portion, and the projection surface into a slightly shallow groove provided on the inner peripheral surface side slightly inside the tip of the outer cylinder portion 8. 13 is press-fitted. Thereby, after press-fitting, the sleeve 3 cannot be easily rotated by hand, and is in a press-contact state in which it does not come out of the outer cylinder portion 8. On the other hand, the fitting portion 11 is fitted into a slightly deeper groove portion 10 provided around the outer peripheral surface slightly inside the tip of the outer cylinder portion 8. The groove portion 10 is provided with a depth that does not cause the pressure contact state by the fitting portion 11, but the sleeve 3 is completely locked by the groove portion 10 and does not come off.

    In the present embodiment, a projection surface 13 is formed on the press-fitting portion 9, and a slightly shallow groove is provided on the inner peripheral surface side slightly inside the tip of the outer cylinder portion 8 to press-fit the projection surface 13. However, as long as the sleeve 3 can maintain a pressure contact state in which the sleeve 3 does not come out of the outer cylinder portion 8, the projection surface 13 and the corresponding groove are not necessarily required.

    As shown in FIG. 1 and FIG. 2, the arm part 12 is disposed at two positions facing each other at an interval of 180 °, and connects the press-fitting part 9 and the fitting part 11 by integral molding. As shown in FIG. 3, one end of the arm portion 12 is made narrower near the connecting portion 14 than the other end (fitting portion 11 side), as shown in FIG. 3. It is easy to be destroyed.

    Next, the use state of the pipe joint of this embodiment will be described.

    At the initial stage when the pipe 1 is inserted into the pipe joint of the embodiment, the synthetic resin holding member 4 is only in light contact with the pipe 1 surface. When the inside of the pipe is pressurized by the fluid flowing in the pipe 1 in this state, the pipe 1 and the holding member 4 are integrally moved to the right side in FIG. 2 by the internal pressure, and the taper portion 7 on the inner wall of the joint body 2 is moved. Along the holding member 4, the diameter is reduced and bites into the pipe 1. Alternatively, if the pipe 1 is pulled by hand in a direction in which the internal pressure is not yet applied, the pipe 1 and the holding member 4 move, and similarly the holding member 4 is reduced in diameter along the tapered portion 7 of the inner wall of the joint body 2. Then bite into the pipe 1. That is, the pipe 1 is held by the diameter-reducing deformation of the holding member 4 to prevent the pipe 1 from coming off during use. The O-ring 30 is a fluid leakage prevention ring.

    Next, a method for removing the pipe 1 from the pipe joint for some reason after use will be described with reference to FIGS.

    In use, the pipe removal tool 22 (see FIG. 7) is not removed until a part of the sleeve 3 (destruction separation sleeve 20 in FIG. 8) covering the pipe connection port at the tip of the outer cylinder portion 8 is broken and removed. It has a structure that can be used.

    Here, a method of breaking and removing a part of the sleeve 3 will be described with reference to FIGS.

    FIG. 4 is a top view and a side view of a dedicated sleeve removal tool 15 for breaking a part of the sleeve 3 of the pipe joint to which the pipe 1 is attached. First, a sleeve removal tool 15 that is created exclusively for the opening 16 that matches the size of the pipe joint is inserted horizontally into the lower end space 18 of the distal end flange 17 of the press-fit portion 9. The metal sleeve removing tool 15 is thick enough to be inserted into the lower end space portion 17. A small notch 19 is provided at the center end inside the opening 16 to accommodate the arm 12 when the sleeve removal tool 15 is inserted. Therefore, the size of the notch 19 may be a little larger than the arm 12.

    A state in which the sleeve removing tool 15 is set in the pipe joint is shown in a top view and a side view of FIG. In this state, when the force is applied by moving the other end of the sleeve removal tool 15 up and down by hand, the sleeve 3 is broken and cut at two places at the connecting portion 14 (the narrowest portion) of the arm portion 12 shown in FIG. As shown in FIG. 8, it is separated into two parts, a fracture separation sleeve 20 and a remaining sleeve 21. Here, the fracture separation sleeve 20 (corresponding to the press-fit portion 9 press-fitted into the inner peripheral portion of the distal end of the outer cylinder portion 8) is moved away from the joint body 2 to the pipe 1 side. The remaining sleeve 21 remains in the groove 10 of the joint body 2 as shown in FIG.

    In the present embodiment, the arm portion 12 is provided at two places, but the same action can be achieved even at one place or more than two places.

    Next, a method for removing the pipe 1 from the pipe joint will be described with reference to FIGS. 6 and 7.

    FIG. 6 is a half sectional view showing a state in which the pipe removal tool 22 is set in the pipe 1. As shown in FIG. 6, the pipe removal tool 22 that fits the size of the separately prepared pipe 1 is mounted on the outer periphery of the pipe 1 and set. The pipe removal tool 22 has a structure in which a distal end portion 22a on the insertion side to the joint body 2 is tapered and the holding member 4 is expanded in diameter. Although a mechanism for attaching the pipe removal tool 22 to the outer periphery of the pipe 1 is not shown in the drawing, the pipe removal tool 22 is easily removed from the outer periphery of the pipe 1 in order to easily and reliably attach the pipe removal tool 22. The tool 22 has a shape in which a cylinder is divided in half and one place is connected.

    Here, when the pipe 1 is pulled out from the pipe joint, the pipe 1 is first pushed into the back side by hand to release the contact between the tapered portion 7 and the holding member 4 and return to the initial shape. Then, the pipe removal tool 22 is inserted into the space 23 that existed before the fracture separation sleeve 20 is removed (the state shown in FIG. 7), and the holding member 4 is pushed into the inner space, and the holding member 4 is pushed from the surface of the pipe 1. Pull 4 apart. Accordingly, the pipe 1 can be easily pulled out of the pipe joint by hand by increasing the diameter of the holding member 4 and releasing the biting into the pipe 1.

    When the pipe 1 is attached again after the pipe 1 is removed, the destructive separation sleeve 20 that has been removed by destructive separation is press-fitted into the projecting surface 13 by hand as shown in FIGS. Install and reuse. However, in this case, the arm portion 12 of the sleeve 3 is broken and cut at two places, and the history of the removal work being performed at least once can be recognized at a glance and recognized by the presence or absence of the breakage. Further, since the remaining sleeve 21 is lightly rotated by hand because it has been separated, it can be easily confirmed that the removal operation has been performed.

    In the pipe joint having the above structure, in use, the fracture separation sleeve 20 of the sleeve 3 covering the pipe connection port at the tip of the outer cylinder portion 8 is broken and separated by the sleeve removal tool 15, and then the pipe removal tool 22 is removed. By using and removing the pipe 1, the pipe can be separated when necessary. Further, by forming the breaking separation sleeve 20 and the remaining sleeve 21 of the sleeve 3 as an integrated shape joined by the arm portion 12 and providing the fragile joint portion 14 on the arm portion 12, a separation history can be left. This can be useful for investigating the cause of troubles such as whether or not the removal work was accurate.

    Further, since the sleeve 3 is not provided with a release function (release member 104 in FIG. 10) for removing the pipe 1, the overall length of the joint is shorter than that of the conventional one, and a compact pipe joint is obtained. Further, the clearance between the inner wall of the outer cylinder portion 8 of the joint body 2 into which the pipe removal tool 22 is inserted and the outer surface of the pipe 1 can be made very narrow because a release mechanism is not required, such as dust, dust, etc. It is possible to suppress intrusion prevention, bending at the base of the pipe 1, and deterioration in sealing performance due to repeated bending.

    Although it is not possible to leave a history of the removal work of the pipe 1, it is not possible to always remove the pipe 1, which is one of the problems. 3 can be solved by using only the fracture separation sleeve 20. In this case, the remaining sleeve 21 and the arm portion 12 are not necessary.

The half section view of the state where the embodiment of the pipe joint concerning the present invention is shown and piping is not inserted. The half section view of the state where the embodiment of the pipe joint concerning the present invention was shown and piping was inserted. The perspective view of the sleeve of the pipe joint which concerns on this invention. The top view and side view before setting a sleeve removal tool to the pipe joint which concerns on this invention. The top view and side view which set the sleeve removal tool to the pipe joint which concerns on this invention. The half sectional view which set the piping removal tool to the pipe joint concerning the present invention. The half sectional view which inserted the piping removal tool into the pipe joint concerning the present invention. The half sectional view showing the state where the sleeve of the pipe joint concerning the present invention fractured and separated. The half sectional view which showed the state equipped with the fracture | rupture isolation | separation sleeve of the pipe joint which concerns on this invention. The half sectional view showing the conventional pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe 2 Joint main body 3 Sleeve 4 Holding member 8 Outer cylinder part 9 Press-fit part 11 Fitting part 12 Arm part 15 Sleeve removal tool 20 Destruction separation sleeve 21 Remaining sleeve 22 Pipe removal tool

Claims (6)

The fitting body;
A holding member for gripping the pipe within the joint body;
A remaining sleeve that is attached to an end of the joint body on the pipe insertion side and that remains on the joint body when separated, a separation sleeve that is separated from the joint body, and the remaining sleeve and the separation sleeve are integrally formed. A pipe joint comprising a sleeve formed of an arm portion that performs the above-described operation. 2. The pipe joint according to claim 1, wherein at least a part of the arm portion can be broken at the time of separation, and the removal history of the pipe can be recognized based on whether or not the arm portion is broken. The pipe joint according to claim 1 or 2 , wherein a width of at least a part of the arm portion is narrow so as to facilitate destruction during the separation. The sleeve is
The pipe joint according to any one of claims 1 to 3, wherein the pipe joint is attached to an end portion of the joint main body on a pipe insertion side and is detachable from the joint main body and prevents attachment of a tool for removing the pipe. A method for removing a pipe connected using the pipe joint according to any one of claims 1 to 4 ,
Removing the sleeve;
Inserting a pipe removal tool into the space that existed before the sleeve was removed and pulling the holding member away from the surface of the pipe;
A method of removing the pipe from the holding member. A method for removing a pipe connected using the pipe joint according to any one of claims 1 to 4 ,
Separating the separation sleeve of the sleeve;
Inserting a pipe removal tool into the space that existed before the separation sleeve was removed and pulling the holding member away from the surface of the pipe;
A method of removing the pipe from the holding member.

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