JP2002147673A - Joint for flexible pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint for a flexible pipe capable of being inexpensively manufactured and easily connecting flexible pipes. SOLUTION: A slit 44 is formed on a tip part of a retainer 4 to allow the tip part of the retainer 4 to be enlarged and reduced. A retainer holding body 5 is slidably mounted on a connection hole 21 of a joint body 2. A fitting part 51a in which the tip part of the retainer 4 is separably fitted in an enlarged state, is formed on an outer periphery of the retainer holding body 5. The retainer 4 is separated from the fitting part 51a and reduced to be engaged with a trough part of the flexible pipe when the retainer holding body 5 is pressed and moved by the flexible pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible pipe joint used for connecting a bellows-shaped flexible pipe.

[0002]

2. Description of the Related Art Generally, a joint of this type includes a joint body having a connection hole into which a flexible pipe (hereinafter sometimes abbreviated as a flexible pipe) is inserted, and a tube arranged in the connection hole. When connecting the flexible pipe, the flexible pipe is first inserted through the opening of the connection hole, and further inserted through the retainer. When the flexible tube is inserted to a predetermined position of the connection hole, the retainer engages with the flexible tube. Thereby, the flexible pipe is connected to the joint body.

The following two types of retainers are used for flexible pipe joints. One retainer includes a plurality of segments, and each segment is held by a retainer holder so as to form a ring as a whole.
Moreover, the inside diameter of the ring formed by the entire segment is sized to allow the flexible tube to pass through. When the flexible tube is inserted to a predetermined position of the connection hole to connect the flexible tube, the retainer is released from being retained by the retainer holder, and the retainers are brought closer to each other by the spring, that is, the inner diameter of the ring is reduced. And engaged with the flexible tube.

In another retainer, a plurality of slits are formed at a distal end portion in a flexible tube insertion direction so that the distal end portion can be enlarged and reduced in diameter. An engagement portion is formed on an inner peripheral surface of the distal end portion. I have. The inner diameter of the engaging portion is smaller than the outer diameter of the ridge of the flexible pipe in a natural state where no external force acts on the retainer, but when the tip of the retainer is expanded, the inner diameter is larger than the ridge of the flexible pipe. The diameter. Therefore,
When the flexible pipe is inserted into the retainer, the distal end of the retainer expands and contracts every time the peak of the flexible pipe passes through the inside of the engaging portion. Then, the engaging portion is engaged with a predetermined valley portion.

[0005]

In the case of a flexible pipe joint using a retainer, not only is it necessary to assemble each segment but also a spring is required, and the number of parts increases accordingly. For this reason, there has been a problem that the manufacturing cost increases. On the other hand, in a flexible pipe joint using a retainer, the retainer must be expanded by inserting the flexible pipe through the retainer, and a large force is required at that time. For this reason, there has been a problem that the fatigue of the worker is great. Further, there is a problem that it is not known whether the retainer is engaged with a predetermined valley from the tip of the flexible tube.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a joint body having a connection hole into which a bellows-shaped flexible pipe is inserted;
A cylindrical retainer that is disposed inside the connection hole and through which the flexible tube is inserted, and inside the connection hole, when the flexible tube is inserted into the retainer,
A locking portion for preventing the retainer from moving in the insertion direction of the flexible tube is provided, and a slit extending rearward from the front end surface of the retainer in the insertion direction of the flexible tube is formed. Thereby, the distal end of the retainer is elastically expandable and contractable, and the inner peripheral surface of the distal end of the retainer is fitted into the valley of the flexible pipe in a natural state where no external force acts on the retainer. In the joint for a flexible pipe provided with a joint portion, a retainer holder is provided movably in the insertion direction of the flexible pipe in the connection hole in the insertion direction forward of the flexible pipe from the retainer,
The retainer holder is provided with a fitting portion in which a distal end portion of the retainer in the insertion direction of the flexible tube is removably fitted rearward in the insertion direction of the flexible tube, and the flexible member inserted through the retainer is provided. A state in which a contact portion against which the distal end of the tube abuts is provided, and the distal end of the retainer is elastically expanded so that the flexible tube can be inserted through a portion where the fitting portion of the retainer is formed. When the retainer is disengaged from the fitting portion, the diameter of the retainer is elastically reduced, and the engaging portion engages with the valley portion of the flexible pipe.

In this case, the retainer holder is provided on a metal cylinder having the fitting portion formed on the outer peripheral surface of the rear end portion, and on the distal end portion of the cylindrical body, and the outer peripheral surface is formed on the connection hole. An annular seal member that fits slidably and airtightly is preferably provided, and the abutment portion is provided on an inner peripheral surface of the seal member. In the connection hole in front of the retainer holder in the insertion direction of the flexible tube,
When the retainer holder is moved forward by the flexible tube, it is preferable that an annular sealing surface against which the distal end of the seal member abuts is provided.
At the tip of the cylindrical body, there is formed an annular projection that projects radially inward, and the annular projection is
It is preferable that the seal member is disposed between a contact portion of the seal member and a distal end surface of the seal member that abuts on the sealing surface. A nut member having a through hole through which the flexible tube can be inserted is screwed into an opening of the connection hole into which the flexible tube is inserted, and the nut member is screwed in the insertion direction of the flexible tube. It is desirable that the retainer is pressed and moved forward in the insertion direction of the flexible tube via the retainer and the flexible tube when the contact is made, so that the seal member abuts on the sealing surface. It is preferable that the locking portion is provided at a position of the nut member located in the connection hole.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIGS. 1 to 4 show an embodiment of the present invention. A flexible pipe joint 1 according to this embodiment includes a joint main body 2, a nut member 3, a retainer 4, and a retainer holder 5 as main components. And

The joint main body 2 is formed in a cylindrical shape by forming a connection hole 21 penetrating the inside from one end face to the other end face (hereinafter, one end is referred to as a right end and the other end is referred to as a left end for convenience of explanation). Has made. The gas pipe G is inserted into the connection hole 21 from the right end through a nut member 3 described later. The gas pipe G includes a bellows-shaped metal pipe (flexible pipe) G1 and a resin coating pipe G2 that covers the outer circumference of the metal pipe G1, and the metal pipe G1 is cut at a valley. ing.

A screw hole 21a, a relief hole 21b, a sliding hole 21c, and a small diameter hole 21d are formed on the inner periphery of the connection hole 21 in order from the right end to the left end. Between the sliding hole 21c and the small diameter hole 21d.
An annular sealing surface 21 e facing the right end side is formed so as to be orthogonal to the axis of the connection hole 21. Also, the joint body 2
A tapered screw portion 22 is formed on the outer peripheral surface of the left end portion so that its axis coincides with the axis of the connection hole 21. The joint body 2 is connected to the gas appliance by screwing the tapered screw portion 22 to the gas appliance. The joint main body 2 may be formed integrally with the main body of the gas appliance. In this specification, the term "gas equipment" includes not only ordinary gas combustion equipment that burns gas, but also equipment such as gas pipes that do not involve gas combustion.

The nut member 3 has a male screw portion 3 at its left end.
1 is formed, and an operation part 32 is formed at the right end.
The male screw portion 31 is screwed into the screw hole portion 21a, and the operation portion 32 projects outside from the connection hole 21. Between the outer peripheral surface of the operation unit 32 and the outer peripheral surface of the right end portion of the joint body 2,
An elastically deformable positioning cylinder 6 made of resin or the like is provided. The right end of the positioning cylinder 6 is fixed to the operation unit 32. An annular engaging projection 61 is formed on the inner peripheral surface of the left end of the positioning cylinder 6, and the engaging projection 61 is engaged with the first positioning recess 23 formed on the joint body 2. Thereby, the nut member 3 is maintained at the initial position. The engaging protrusion 61 is immovably engaged with the engaging concave portion 23 to the right, but is able to escape to the left. Therefore, when the nut member 3 is screwed leftward from the initial position, the engagement protrusion 61 comes out of the first positioning recess 23 and slides on the outer peripheral surface of the joint body 2. Then, when the male screw portion 31 is screwed into the screw hole portion 21a to a connection position where the left end surface of the operation portion 32 abuts on the right end surface of the joint body 2, the engagement protrusion 61 is formed on the outer peripheral surface of the joint body 2 in the second positioning. It fits into the recess 24. The engagement protrusion 61 is immovably engaged with the second positioning recess 24 to the right. This allows
The nut member 3 is maintained at the connection position.

The nut member 3 is formed with a through hole 33 penetrating on its axis. In the inner periphery of the through hole 33, the large-diameter hole portion 3 is sequentially formed from the right end to the left end.
3a, a small diameter hole 33b, and a mounting hole 33c are formed. The large-diameter hole portion 33a has an inner diameter through which the cladding tube G2 can be inserted, and a sealing member 71 for sealing between the cladding tube G2 and the inner peripheral surface of the large-diameter hole portion 33a is provided on the inner peripheral surface. Is provided. The small-diameter hole portion 33b has an inner diameter through which the metal tube G1 can be inserted, but the cladding tube G2 cannot be inserted. The inner peripheral surface of the small-diameter hole portion 33b and the small-diameter hole portion 3
3b, a fire-resistant seal member for sealing between the inner peripheral surface of
Is provided. The mounting hole 33c is a small-diameter hole 33b.
It is formed with a larger diameter. An engagement recess 34 is formed on the inner peripheral surface of the mounting hole 33c.

The right end of the cylindrical retainer 4 (the end at the rear in the insertion direction of the metal tube G1) is fitted into the mounting hole 33c of the nut member 3. The retainer 4 is made of metal such as brass, and has a thin portion 41 on the right end side and a thick portion 42 on the left end side. The thin portion 41 is attached to the mounting hole 3.
3c. An annular engaging projection 43 is formed on the outer peripheral surface at the right end of the thin portion 41. The engagement protrusion 43 enters the engagement recess 34. The engagement protrusion 43 is provided on the left side surface (locking portion) 34 a of the engagement recess 34.
Of the gas pipe G with respect to the nut member 3 of the retainer 4 is prevented from moving forward in the insertion direction. Therefore, unless the nut member 3 is moved,
The movement of the retainer 4 joint body 2 in the same direction is also prevented. In addition, since the right end surface of the retainer 4 abuts against the right side surface 34b of the engagement recess 34, the gas tube G is prevented from moving backward in the insertion direction. Therefore, the right side surface 34b of the engagement concave portion 34 is
It functions as a kind of locking part as well. Moreover, since the right end surface of the retainer 4 abuts against the right side surface 34b, when the nut member 3 is screwed in the insertion direction of the gas pipe G, the retainer 4 is pressed and moved forward by the nut member 3 in the insertion direction of the gas pipe G. .

The thick portion 42 of the retainer 4 is formed with a plurality of slits 44 extending rightward from the left end surface (the end surface on the front side in the insertion direction of the gas pipe G). The formation of the slit 44 allows the thick portion 42 to be elastically enlarged and reduced in diameter. An annular engaging portion 45 protruding radially inward is formed on the inner peripheral surface of the left end portion of the thick portion 42. Here, the inner diameter of the portion of the retainer 4 excluding the engagement portion 45 is slightly larger than the peak of the metal tube G1.
The inner diameter of the engaging portion 45 is substantially equal to the outer diameter of the valley in a natural state in which no external force acts on the retainer 4. Therefore, when the engaging portion 45 is fitted into the valley of the metal tube G1,
The retainer 4 and the metal tube G1 are connected so as to be relatively immovable. The inner diameter of the engaging portion 45 can be made larger than the outer diameter of the peak portion of the metal tube G1 by expanding the thick portion 42. When the diameter of the thick portion 42 is expanded, the left end portion of the thick portion 42 is inserted into the escape hole 21b of the connection hole 21, thereby enabling the diameter of the thick portion 42 to be expanded.

A cylindrical retainer holder 5 is slidably fitted in the sliding hole 21d of the joint body 2 with its axis aligned with the axis of the sliding hole 21d (the axis of the connection hole 21). Have been combined. The retainer holder 5 includes a metal cylinder 51.
And an annular seal member 52 made of an elastic resin such as rubber. The left end of the tubular body 51 (the end in the insertion direction of the metal tube G1) is embedded in the seal member 52. . Thus, the cylindrical body 51 and the seal member 52 are integrated.

The outer diameter of the cylindrical body 51 is slightly smaller than the inner diameter of the sliding hole 21d, and the inner diameter is slightly larger than the outer diameter of the peak of the metal tube G1. Therefore, the metal tube G1 can be inserted into the cylindrical body 51. The right end of the tubular body 51 extends to a position facing the escape hole 21b, and a fitting portion 51a is formed on the outer peripheral surface thereof. The engaging portion 45 of the retainer 4 is slidably fitted to the fitting portion 51a. Of course, in this fitted state, the retainer 4
Is expanded by a tubular body 51 so that the metal tube G1 can be inserted through the retainer 4. Retainer holder 5
Is moved to the left (in the direction of insertion of the metal tube G1) with respect to the retainer 4, the engaging portion 45 is disengaged from the fitting portion 51a.
Then, the thick portion 42 of the retainer 4 is reduced in diameter by its own elasticity. Then, as described later, the engaging portion 45 engages with the valley of the metal tube G1. In this case, the engaging portion 45
Is engaged with the second valley from the tip of the metal tube G1, but may be engaged with the first valley, or may be engaged with the third and subsequent valleys. On the inner peripheral surface at the left end of the cylindrical body 51, an annular protruding portion 51b protruding radially inward is formed. The inner diameter of the annular protrusion 51b is formed to be substantially equal to the inner diameter of the valley of the metal tube G1, but may be slightly smaller than the inner diameter of the valley.

The outer diameter of the seal member 52 is slightly larger than the inner diameter of the sliding hole 21d. Therefore, the seal member 52 is slidably in contact with the sliding hole 21d while being elastically compressed. Thereby, the retainer holder 5
And the inner peripheral surface of the sliding hole 21d is hermetically sealed. The right end of the seal member 52 projects rightward from the sliding hole 21c, and an annular small ridge 52a is formed on the outer peripheral surface of the projected right end. The formation of the small protrusion 52a prevents the seal member 52 from easily moving to the left.

The inside diameter of the right end of the seal member 52 is slightly larger than the outside diameter of the metal tube G1. Therefore, the metal pipe G1 can be inserted into the seal member 52 from the right end opening. The inner diameter of the seal member 52 from the middle portion to the left end surface is slightly smaller than the inner diameter of the valley portion of the metal tube G1, and a contact portion 52b is formed on the inner circumferential surface of the middle portion. The contact portion 52b has substantially the same shape as the outer peripheral surface in the range from the valley to the peak of the metal tube G1. Therefore, when the metal tube G1 is inserted into the seal member 52, the tip of the metal tube G1 abuts on the contact portion 52b. Thereby, the inside of the seal member 52 and the inside of the metal tube G1 are airtightly connected. In addition, when the metal tube G1 abuts on the contact portion 52b, the seal member 52 is pushed to the left. In this case, since the annular projection 51b exists near the left side of the contact portion 52b, the annular projection 51b reinforces the contact portion 52b. When the sealing member 52 moves to the left by a predetermined distance, the left end face of the sealing member 52
It hits 1e. Thereby, the space between the seal member 51 and the sealing surface 21e is hermetically sealed. Moreover,
An annular ridge 52c is formed on the left end surface of the seal member 52. The protrusion 52c is pressed into contact with the sealing surface 21e by the annular protrusion 51b, whereby the space between the seal member 52 and the sealing surface 21e is more airtightly sealed.

When the gas pipe G is connected to the gas appliance using the flexible pipe joint 1 having the above-described structure, first, the tapered male thread portion 22 of the joint main body 2 is attached to the tapered female thread formed at the gas inlet of the gas appliance. Is screwed and fixed, and the connection hole 21 of the joint main body 2 communicates with the gas inlet of the gas appliance. Next, the gas pipe G is inserted into the connection hole 21 from the through hole 33 of the screw member 3. In this case, the distal end portion of the cladding tube G2 is cut in advance by a predetermined length, and the cladding tube G2
3a, so that only the metal tube G1 is inserted into the connection hole 21 from the small-diameter hole 33b. The distal end of the metal tube G <b> 1 inserted from the through hole 33 penetrates the retainer 4 and is inserted into the retainer holder 5. And it abuts on the contact part 52b.

When the metal tube G1 is further inserted with the tip of the metal tube G1 abutting on the contact portion 52b, the retainer holder 5 is pressed and moved to the left. At this time, since the retainer 4 is prevented from moving leftward by the screw member 3, when the retainer holder 5 moves leftward to a predetermined position, the engaging portion 45 of the retainer 4 moves the retainer holder 5. It detaches from the fitting part 51a. Then, the diameter of the thick portion 42 of the retainer 4 is reduced, and the engagement portion 55 is
1 valley. At this time, the engaging portion 55 is
Since the vehicle 1 collides vigorously, the impact generated at that time is transmitted to the hand via the gas pipe G, and the impact sound reaches the ear. Thereby, the connection operator can recognize that the metal tube G1 has been inserted to the predetermined position.

Next, the screw member 3 is screwed. Then, the retainer 4, the metal tube G1, and the retainer holder 5 are moved to the left together, and the positioning cylinder 6 is moved to the left. When the screw member 3 is screwed to the connection position,
The left end of the seal member 52 is pressed against the sealing surface 21e. Moreover, the left end of the seal member 52 is
1b strongly presses against the sealing surface 21e. When the left end of the sealing member 52 is pressed against the sealing surface 21e and stopped, the left end of the metal tube G1 is
It is strongly pressed by the second contact portion 52b. As a result, the inside of the metal pipe G1 is
1, and a gas pipe G is connected to the gas appliance via the joint 1.

When the screw member 3 is screwed to the connection position, the engaging projection 61 of the positioning cylinder 6 fits into the second engaging recess 24. At this time, the left end of the positioning cylinder 6 vigorously hits the outer peripheral surface of the joint body 1. While the impact at that time is felt by hand through the joint body 1 and the screw member 3,
By hearing the impact sound by ear, it can be recognized that the screw member 3 has been screwed to the connection position.

As described above, according to the flexible pipe joint 1 of the present invention, since the retainer 4 is integrally formed without being divided into a plurality of segments, labor for assembling the segments is unnecessary. Not only
A spring for reducing the diameter of each segment is unnecessary. Therefore, the manufacturing cost of the joint 1 can be reduced. Moreover,
Since the diameter of the retainer 4 is expanded in advance so that the metal tube G1 can be inserted, there is no need to expand the diameter of the retainer 4 by inserting the metal tube G1.
Therefore, the fatigue of the worker can be significantly reduced. Further, when the engaging portion 45 of the retainer 4 is detached from the fitting portion 51a, the retainer 4 is engaged with a predetermined valley from the tip of the metal tube G1, so that it can be always engaged with the predetermined valley.

FIGS. 5 to 8 show another embodiment of the present invention. Flexible pipe joint 1 'of this embodiment
, A retainer 4 ′ is used in place of the retainer 4. The left end of the retainer 4 ′ is fitted on the outer peripheral surface of the left end of the screw member 3. Correspondingly, an engaging recess 35 instead of the engaging recess 34 of the above embodiment is formed on the outer peripheral surface of the left end portion of the screw member 3, and an engaging protrusion 43 ′ instead of the engaging protrusion 43 is provided on the retainer 4. ′ Are formed on the inner peripheral surface at the left end. The engagement protrusion 43 ′ abuts on the left side surface (locking portion) 35 a of the engagement recess 35, thereby preventing the retainer 4 ′ from moving to the left. The right end surface of the retainer 4 'abuts the right measurement surface 35b of the engagement recess 35, thereby preventing the retainer 4' from moving rightward. Other configurations are the same as those of the above-described embodiment, and therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately changed. For example, in the above embodiment, the nut member 3
, But the nut member 3 is not necessarily provided. In that case, the locking portion may be formed on the inner peripheral surface of the connection hole 21.

[0026]

As described above, according to the present invention, it is possible to manufacture a flexible pipe joint at low cost and easily, and to greatly reduce the fatigue of a flexible pipe connection operator. Further, an effect is obtained that the retainer can be engaged with a predetermined valley of the flexible pipe.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an initial state of an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the same embodiment in a state where a flexible tube is inserted to a predetermined position.

FIG. 3 is a sectional view showing the same embodiment in a state where a screw member is screwed to a predetermined connection position.

FIG. 4 is a view showing a retainer used in the embodiment, and FIG. 4 (A) is a front view thereof, FIG.
FIG. 4B is a sectional view taken along line BB of FIG.

FIG. 5 is a sectional view showing an initial state of another embodiment of the present invention.

FIG. 6 is a cross-sectional view showing the same embodiment in a state where the flexible tube is inserted to a predetermined position.

FIG. 7 is a cross-sectional view showing the same embodiment in a state where a screw member is screwed into a predetermined connection position.

FIG. 8 is a view showing a retainer used in the embodiment, and FIG. 8 (A) is a front view thereof, FIG.
FIG. 9B is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 G1 Metal pipe (flexible pipe) 1 Joint for flexible pipe 1 ′ Joint for flexible pipe 2 Joint body 3 Screw member 4 Retainer 4 ′ Retainer 5 Retainer holder 21 Connection hole 21e Sealing surface 33 Through hole 34a Left side surface of engagement recess Stop portion) 44 Slit 45 Engagement part 51 Cylindrical body 51a Fitting part 51b Annular protruding part 52 Seal member 52b Contact part

Continued on the front page (72) Inventor Hitoshi Denda 4-20-14 Toyocho, Shinagawa-ku, Tokyo F-term in Gwangyang Sangyo Co., Ltd. 3H017 CA07

Claims (6)

[Claims] 1. A joint body having a connection hole into which a flexible pipe having a bellows shape is inserted, and a cylindrical retainer disposed inside the connection hole and through which the flexible pipe is inserted, Inside the connection hole, when the flexible tube is inserted into the retainer, a locking portion for preventing the retainer from moving in the insertion direction of the flexible tube is provided, and the retainer in the insertion direction of the flexible tube is provided. A slit extending rearward from the distal end surface is formed at the distal end portion, whereby the distal end portion of the retainer can be elastically enlarged and reduced in diameter, and an external force applied to the retainer at the inner peripheral surface of the retainer distal end portion. In a natural state in which is not acting, in a flexible pipe joint provided with an engaging portion that fits into a valley of the flexible pipe, A retainer holder is provided movably in the insertion direction of the flexible tube in the connection hole at the front in the insertion direction of the flexible tube, and the tip of the retainer in the insertion direction of the flexible tube is provided on the retainer holder. A fitting portion is provided to be fitted removably backward in the insertion direction of the flexible tube, and a contact portion is provided for abutting against a distal end portion of the flexible tube inserted into the retainer, and the fitting portion of the retainer is provided. When the formed portion can be inserted into the flexible tube, the retainer is fitted into the fitting portion in a state where the distal end portion of the retainer is elastically expanded, and the retainer is detached from the fitting portion. A joint for a flexible pipe, wherein the diameter of the pipe is elastically reduced so that the engaging portion is engaged with a valley of the flexible pipe. 2. The retainer holder is provided at a distal end portion of a metal cylinder having the fitting portion formed on an outer peripheral surface of a rear end portion, and an outer peripheral surface is hermetically sealed to the connection hole. The joint for a flexible pipe according to claim 1, further comprising an annular seal member that is slidably fitted to the seal member, wherein the contact portion is provided on an inner peripheral surface of the seal member. . 3. The front end of the seal member abuts in the connection hole in front of the retainer holder in the insertion direction of the flexible tube when the retainer holder is moved forward by the flexible tube. The joint for a flexible pipe according to claim 2, wherein an annular sealing surface is provided. 4. A cylindrical projection is formed at a distal end of the cylindrical body so as to protrude radially inward, and the annular projection is configured to be in contact with a contact portion of the seal member and the sealing surface. The joint for a flexible pipe according to claim 3, wherein the joint is arranged between the seal member and a front end surface of the seal member. 5. A nut member having a through-hole through which the flexible tube can be inserted is screwed into an opening of the connection hole into which the flexible tube is inserted. When screwed in the insertion direction of the retainer, the retainer is pressed and moved forward in the insertion direction of the flexible tube via the flexible tube, and the sealing member is brought into contact with the sealing surface. The flexible pipe joint according to claim 3, wherein the joint is a flexible pipe. 6. The flexible pipe joint according to claim 5, wherein the locking portion is provided at a position of the nut member located in the connection hole.