KR20010067996A - joint for connecting a flexible pipe - Google Patents

Abstract

PURPOSE: A coupling joint for flexible pipes is provided to be applied to various shaped flexible pipes, to reduce production costs with simple structure and strong corrosion resistance, and to be easily separated from the flexible pipes for permanent use. CONSTITUTION: A flexible pipe coupling joint consists of: a cylindrical connector(41) having an external screw thread(410) in the end; a nut(42) having an internal screw thread(420) corresponding to the external screw thread; a collet(43) supporting a flexible pipe(45); and an O-ring(44) between the connector and the collet. The connector is combined with the nut through the external and the internal screw thread to be coupled with the flexible pipe. A first to a third stopper are continuously formed in the axial exposed portion of the connector to prevent the flexible pipe, the O-ring, and the collet from leading in the connector. The first stopper supports the flexible pipe and the third stopper supports the collet. The O-ring is placed in a space between the second stopper and the collet.

Description

Joint for connecting a flexible pipe

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for flexible pipe connection, and more particularly to a joint aimed at improving sealability and easy separation.

As a conduit for fluid movement or a conduit for protecting electric wires during wiring construction of a building, a flexible pipe formed of a synthetic resin member is used. The flexible pipe is lightweight, strong in strength, and can be bent freely, so it is used as a pipe for fluid transport, wiring construction, and a protective tube for protecting various wire rods.

A connector and a joint connected thereto are used for the distribution of fluid through these flexible tubes or the interconnection of the flexible tubes. By the way, it is necessary to easily disassemble the flexible pipe from the joint connected to the connector due to a construction defect or a change in the laying route.

1 is a partially cutaway side view showing an embodiment of a corrugated flexible pipe joint according to the prior art, FIG. 2 is a partially cutaway side view of the locking ring of FIG. 1, and FIG. 3 is a front view of the locking ring of FIG. 2.

1 to 3, the joint 1 is the main body 2, the engaging ring (3) disposed in front of the main body to engage with the flexible wave tube, and the front of the main body 2 is mounted to the main body ( It consists of a catching cylinder 4 which accommodates the catching ring 3 in cooperation with 2).

The main body 2 has a cylindrical base end 2a for attaching to a wire storage container such as a ceiling or a wall, an insertion portion 2b for inserting the distal end of the corrugated flexible pipe having a diameter larger than that of the base end 2a, and It consists of a hexagonal portion 2c for coupling a wrench or the like to the outer peripheral surface of the connecting portion between the base end portion 2a and the insertion portion 2b. At this time, the external thread 2d is formed in the outer peripheral surface of the base end part 2a.

On the other hand, the flange 2e is annularly formed over the perimeter on the outer peripheral surface of the insertion part 2b, and the external thread is formed from the opening end to the flange 2e. The insertion hole 2g of the insertion portion 2b is enlarged to have a step in the vicinity of the open end and is a storage portion 2g 'for accommodating the rear portion of the locking ring 3.

In addition, the insertion hole 2g has a diameter slightly larger than the outer diameter of the corrugated flexible pipe to be inserted at the stepped portion with the housing portion 2g ', and is stepped with the insertion hole 2h of the base end 2a. The diameter gradually decreases to (2i), and has a diameter approximately equal to the outer diameter of the corrugated flexible pipe at the portion of the step surface 2i.

On the other hand, in the storage portion 2g ', a plurality of long holes 2j extending in the axial direction between the opening end and the flange 2e are formed at equal intervals in the circumferential direction, and the inner surface of the storage portion 2g' is formed. Each end is formed with a guide groove 2k in which each end is opened in the front end side surface of the long hole 2j, and each other end is respectively opened in the opening end of the insertion part 2b.

As shown in Figs. 2 to 3, the locking ring 3 is a plurality of locking arms 3a and one stopper arm 3b are equally arranged in the circumferential direction.

On the inner surface of the tip of each locking arm 3a, a locking projection 3c is formed to face inward in the radial direction. A stopper 3d is formed on the tip outer peripheral surface of the stopper arm 3b. The outer peripheral surface of the tip of the locking arm 3a is chamfered to form an inclined surface 3a '.

The latching projection portion 3c has a tapered shape in its tapered shape from its front end to the opening end in front of the projection, and is a guide surface 3c '. This facilitates insertion of the distal end of the corrugated flexible tube.

The stopper 3d has an inclined surface 3d 'from one side to approximately the center thereof. The catching arm 3a is bendable with the attached part as a point, and the diameter of the front end can be enlarged or reduced in the radial direction. When the diameter is a normal diameter, the locking projection 3c is coupled to the valley portion of the corrugated flexible pipe to be connected, and when the diameter is enlarged, the engagement can be released.

Further, a plurality of protrusions 3e are formed at equal intervals along the circumferential direction on the base end (rear) outer peripheral surface of the locking ring 3. The locking ring 3 is accommodated so that its proximal end (rear) is inserted into the housing portion 2g 'of the main body 2 from the opening end side and slidably in the axial direction. At this time, each projection 3e passes through each guide groove 2k and is inserted into the elongated hole 2j. The locking ring 3 has a front end face (hereinafter, '') of a hole 2j having a long projection 3e at a position where the proximal end face (rear end face) abuts on the stepped surface between the storage portion 2g 'and the insertion hole 2g. The inside of the housing portion 2g 'can be moved in the axial direction in the range up to the contact with the stop surface 2' (Fig. 3).

Hereinafter, a detailed description of the configuration and operation of the prior art and other embodiments are described in the Republic of Korea Patent Publication (Registration No. 10-0258752, Name of the Invention: Joint for corrugated flexible pipe).

However, in the prior art, since the protrusions should be formed on the outer circumferential surface of the flexible tube, there is a disadvantage in that the selection range of the flexible tube is narrowed. For this reason, conventional joints have been difficult to apply to various types of flexible tubes.

In addition, it was pointed out that the structure of the joint is very complicated and disadvantageous in terms of reproducibility and manufacturing cost, and it is difficult to manufacture an injection molding using only plastic material, and thus, it is vulnerable to corrosiveness.

In particular, since the detachment of the flexible tube is made in a pressurized manner, the separation is not easy, and since the protrusion formed on the surface of the flexible flexible tube is used, there is a problem in that the inner and outer flexible tubes are poorly sealed.

Accordingly, an object of the present invention is to provide a joint for flexible pipe connection that can be easily applied to various types of flexible pipes.

Another object of the present invention is to provide a simple structure, strong corrosion resistance, and significantly reduce manufacturing costs.

Another object of the present invention is to be able to easily separate the flexible tube, to enable repeated use semi-permanently.

1 is a partial cross-sectional view showing an embodiment of a joint for a corrugated flexible pipe according to the prior art.

2 is a partial cross-sectional view of the locking ring of FIG.

3 is a front view of the locking ring of FIG.

Figure 4 is a partially cutaway side view of the flexible pipe connection joint according to the present invention showing the flexible pipe is fastened to the connector by the joint.

Figure 5 is a partially cutaway side view of the flexible pipe connection joint according to the present invention showing the flexible pipe is separated from the connector by the joint.

Figure 6 is a perspective view of the collet of the joint for flexible pipe connection according to the invention.

7 is a front view of a collet of a flexible pipe connection joint according to the present invention as viewed from the axial direction.

8 is a front view of the nut of the flexible pipe connection joint according to the present invention as viewed from the axial direction.

Figure 9 is a partially cutaway side view showing a joint according to another embodiment of the present invention.

<Description of the reference numerals for the main parts of the drawings>

41; Connector 42; nut

43; Collet 45; Flexible tube

410; Male threaded acid 420; Internal thread

The present invention for achieving the above object has a connector having at least one cylindrical opening into which the flexible tube is inserted, the outer peripheral surface is formed with a male thread; A female thread corresponding to the male thread of the connector is formed on an inner circumferential surface thereof, and a nut having a hole into which the flexible pipe is inserted is formed at one side thereof; A collet disposed inside the nut and formed with a hole into which the flexible tube is inserted, and tightly supporting the flexible tube while being pressed against the connector in the axial direction by being pressed by the nut fastened to the connector; And an o-ring interposed between the collet and the connector.

Preferably, the embodiment of the present invention further comprises a plurality of protrusions formed on the outer circumferential surface of the nut and protruding in the axial direction of the nut. In the collet, a plurality of grooves are formed at equal intervals along the axial direction from one end facing the connector, and the collet is formed of an elastic material having a hardness greater than that of the flexible pipe.

According to the present invention, when a joint is used to connect a flexible tube such as a plastic tube to a connector, a male screw thread formed on the outer circumferential surface of the cylindrical opening of the connector and a nut formed on the inner circumferential surface of the female thread corresponding thereto are connected to the connector and the flexible tube. To achieve.

At this time, in the axial exposed portion of the cylindrical opening of the connector having the first diameter, the first to third latching jaws in the form of three steps in the axial cross section having the second to fourth diameters, respectively, are continuously formed (first Diameter <second diameter <third diameter <fourth diameter), these latching jaws serve as stoppers for preventing the entry of the flexible tube, the o-ring and the collet, respectively.

The O-ring is made of a material having excellent elasticity such as rubber, and consists of a circular ring having an inner diameter similar to the second diameter and an outer diameter similar to the third diameter. When the flexible tube is closely adhered by the collet, the connector and the flexible tube It serves to seal the gap between.

On the other hand, the collet has a cylindrical shape having a hole through which the flexible tube can pass, and is made of an elastic material having a higher hardness than the flexible tube, and when the flexible tube is connected to the connector, the collet is held in close contact with the O-ring at the same time. Has functions.

In addition, the collet has an annular portion having a diameter larger than the third diameter of the second locking jaw of the cylindrical opening and slightly smaller than the fourth diameter of the third locking jaw, and a taper extending from the annular portion and decreasing in the outer direction of the cylindrical opening. And a chamfer portion extending from the taper portion and having a wedge portion formed along the inner circumferential surface thereof, and a tubular pressing portion extending from the chamfer portion. At this time, the inclined surface of the chamfer portion is formed on the outer circumferential surface and the inner circumferential surface, respectively, the inclined surface formed on the inner circumferential surface forms one side of the wedge portion. An inclined surface corresponding to the inclined surface of the chamfer is formed on the inner circumferential surface that forms the hole of the nut. In other words, the inclined surfaces of the nut and the chamfer are brought into close contact with each other, so that the collet is held in close contact with the connector while supporting the flexible pipe.

On the other hand, a long groove in the axial direction of the collet from the annular portion to the intermediate point of the pressing portion is formed several times to facilitate the tightening function of the collet when screwing.

In addition, since the pressing portion of the collet is squeezed into the flexible pipe by screwing, it is not easy to separate from the flexible pipe. Therefore, when removing the flexible pipe from the connector, loosen the nut and press the pressing portion to press the wedge portion according to the principle of lever. It functions to easily detach from the flexible tube.

Instead of the above embodiment, the third locking jaw forms an inclined surface, and correspondingly, the inclined surface may be formed in the annular portion of the collet. The inner circumferential surface forming the hole of the nut is omitted and simply forms a horizontal plane. Of course, so that the horizontal surface of the nut is accommodated, the corresponding portion of the collet, that is, the portion where the inclined surface was formed in the above embodiment is formed stepped stepwise.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 is a partially cutaway side view of the flexible pipe connection joint according to the present invention showing a state in which the flexible pipe is fastened to the connector by the joint.

Referring to FIG. 4, the flexible pipe connection joint according to the embodiment of the present invention includes a cylindrical connector 41 having a male thread 410 formed at an end thereof and a female thread 420 corresponding to the male thread 410. A nut 42 formed, a collet 43 for supporting the flexible pipe 45, and an O-ring 44 interposed between the connector 41 and the collet 43. .

According to the present invention, when the joint is used to connect the flexible tube 45 such as a plastic tube to the connector, the male thread 410 and the corresponding female thread 420 formed on the outer circumferential surface of the cylindrical opening of the connector 41 are disposed on the inner circumferential surface thereof. The formed nut 42 is screwed to achieve a connection between the connector 41 and the flexible pipe 45.

At this time, the first to third latching jaws of three steps in the axial cross section having the second to fourth diameters in the axial direction (I-I ') exposed portion of the connector 41 having the first diameter are continuous. (First diameter <second diameter <third diameter <fourth diameter), these locking jaws serve as a stopper for preventing the introduction of the flexible pipe 45, the o-ring 44 and the collet 43, respectively Do it. In more detail, the function of each of the locking jaws is that the flexible pipe 45 is supported on the first locking jaw disposed at the innermost side, and the collet 43 is supported on the third locking jaw disposed at the outer side thereof. The O-ring 44 is interposed in a space formed by the second engaging jaw disposed in the collet 43.

The o-ring 44 of an elastic material such as rubber or the like has a circular shape having an inner diameter corresponding to the second diameter and an outer diameter corresponding to the third diameter. The o-ring 44 of this shape has a gap between the connector 41 and the flexible pipe 45 and the collet 43 when the collet 43 is brought into close contact with the first locking jaw by tightening the nut 42. It serves to seal the. That is, the O-ring 44 formed of an elastic material such as rubber is supported by the second locking jaw, and thus expands in a direction perpendicular to the axial direction by the pressure of the nut, thereby expanding the connector (by the collet 45). 41) serves to completely seal between the tube portion of the flexible pipe 45 and the connector 41 in close contact with the inside.

The male thread 410 and the female thread 420 corresponding to the connector 41 are formed on the inner circumferential surface of the nut 42 at one end corresponding to the connector 41, and the other end of the nut 42 is disposed between the third diameter and the fourth diameter. A hole having a fifth diameter having a size of is formed. The second inclined surface T2 having a predetermined inclination angle is formed on the inner surface of the other end of the nut 42, and corresponds to the first inclined surface T1 of the collet 43 described below.

That is, the nut 42 has a hole penetrating the central portion, and the hole has a first hole having a diameter corresponding to the outer circumferential surface of the connector 41 in the axial direction I-I 'and a second inclined surface T2. ) And a third hole having a fifth diameter extending from the first hole and gradually narrowing in diameter, and a fifth diameter extending from the second hole and formed at the other end of the nut 42.

On the other hand, the outer circumferential surface of the cylindrical nut 42 is formed with a plurality of nut protrusions 421 to facilitate the tightening / loosening of the nut. Instead of forming the nut protrusion 421, the nut 42 may be formed in a polygon such as a hexagon.

The collet 43 has a cylindrical shape having a hole through which the flexible pipe 45 can penetrate at the center, and is made of a synthetic resin elastic material such as plastic having a higher hardness than the flexible pipe 45, thereby connecting the flexible pipe 45 to the connector. Upon entry into 41, the outer circumferential surface of the flexible pipe 45 is tightened to hold it firmly, and at the same time, it has two functions of being in close contact with the O-ring 44.

The collet 43 has a diameter larger than the third diameter of the second locking jaw formed in the connector 41 and slightly smaller than the fourth diameter of the third locking jaw, and corresponds to the third locking jaw and the o-ring 44. An annular portion 43a having a fourth inclined surface T4, a tapered portion 43b extending from the annular portion 43a and gradually decreasing in diameter in the outward direction of the connector 41, and a tapered portion 43b. Wedge portion (W) having a third inclined surface (T3) is formed along the inner circumferential surface extending from the chamfer (43c) formed on the outer circumferential surface of the first inclined surface (T1) having a sharp inclination angle than the tapered portion (43b) on the outer peripheral surface ) And a pressing portion 43d extending from the chamfer 43c.

At this time, the first inclined surface T1 and the third inclined surface T3 of the chamfer 43c are respectively formed to correspond to each other on the outer circumferential surface and the inner circumferential surface of the chamfer 43c, and the third inclined surface T3 formed on the inner circumferential surface is It forms one side of one wedge (W). That is, one side of the wedge portion (W) is made of a third inclined surface (T3) having a predetermined gentle inclination angle and the other side is made of a steep inclined surface having an inclination angle of a substantially vertical form. However, the tip of the wedge portion W partially inserted into the flexible pipe 45 is preferably curved to prevent breakage of the flexible pipe 45.

On the other hand, a plurality of long grooves are formed in the axial direction (I-I ') of the collet 43 from the annular portion 43a to the chamfer 43c, thereby facilitating the tightening function of the collet 43 when screwing. These grooves may be formed to extend to about the intermediate point of the pressing portion 43d, in the embodiment of the present invention formed four grooves perpendicular to each other, but can be increased or decreased as necessary. Each of the grooves of the collet 43 provides a place where the collet 43 expands into the space between the grooves when the collet 43 is compressed by the nut 42, so that the inner circumferential surface of the collet 43 is flexible. (45) serves to ensure a close contact. In addition, the wedge portion W of the collet 43 penetrates into the flexible pipe 45 to firmly fix the flexible pipe 45.

On the other hand, since the wedge portion W is inserted into the flexible pipe 45, it is not easy to separate the flexible pipe 45 from the collet 43, so that the flexible pipe 45 is separated from the connector 41. When the nut 42 is loosened and the pressing portion 43d is pushed toward the center of the flexible pipe 45, the wedge portion W can be easily separated from the flexible pipe 45 by the lever principle.

5 is a partially cutaway side view of the flexible pipe connection joint according to the present invention showing the flexible pipe separated from the connector by the joint.

Referring to FIG. 5, in order to release the nut or screw tightening as described above, the flexible pipe 45 is supported by the collet 43 and is in close contact with the connector 41 through the O-ring 44. The state in which the nut 42 is loosened by a predetermined pitch is shown.

6 is a perspective view of a collet of a flexible pipe connection joint according to the present invention, and FIG. 7 is a front view of a collet of a flexible pipe connection joint according to the present invention as viewed in the axial direction (I-I ').

Referring to FIG. 6, the collet 43 according to the present invention basically has a cylindrical structure, and its diameter gradually decreases in the axial direction (I-I '). The collet 43 is composed of an annular portion 43a, a tapered portion 43b, a chamfer 43c, and a pressing portion 43d.

The annular portion 43a has a diameter larger than the third diameter of the second locking jaw formed in the cylindrical opening of the connector 41 and slightly smaller than the fourth diameter of the third locking jaw, and the third locking jaw and the o-ring 44 Has a fourth inclined surface T4 corresponding thereto.

The taper portion 43b extends from the annular portion 43a and has a form in which the diameter is gradually reduced in the outward direction of the cylindrical opening.

The chamfer part 43c extends from the taper part 43b, and has the taper part 43b in the outer peripheral surface of the wedge part W and the chamfer part 43c which have the 3rd inclined surface T3 along the inner peripheral surface of the chamfer part 43c. It has the 1st inclined surface T1 which has a more steep inclination-angle.

The pressing part 43d extends from the chamfer 43c and is exposed through the hole of the nut 42.

On the other hand, the groove G which is long in the axial direction I-I 'of the collet 43 up to an intermediate point of the annular portion 43a, the tapered portion 43b, the chamfer 43c, and the pressing portion 43d. A plurality of these are formed to facilitate the fastening function of the collet 43 when screwing. In the exemplary embodiment of the present invention, four grooves G that are perpendicular to each other are formed, but this may be increased or decreased as necessary.

Referring to FIG. 7, the front of the collet 43 viewed from the axial direction is shown. First, a circular annular portion 43a having a fourth inclined surface T4 inserted first into the cylindrical opening of the connector 41 is shown, and there are four grooves having wedge portions W at their ends and perpendicular to each other ( The chamfer 43c which is seen to be separated from each other by G) is shown.

8 is a front view of the nut of the flexible pipe connection joint according to the present invention as seen from the axial direction.

Referring to FIG. 8, a circular nut body 423 located at one side of the nut is shown, and a female thread 420 is formed on the inner circumferential surface of the nut body 423 at one end corresponding to the cylindrical opening of the connector 41. On the other side of the nut 42, the rear portion 422 of the nut is located.

A second inclined surface T2 extending from the rear surface 422 and corresponding to the first inclined surface of the collet chamfer is formed in a circular shape. At this time, the second inclined surface T2 defines a through hole H for receiving the flexible tube.

A plurality of nut protrusions 421 are formed on the outer circumferential surface of the cylindrical nut 42 to facilitate nut tightening and loosening.

On the other hand, Figure 9 is a cross-sectional view showing a joint according to another embodiment of the present invention. Compared with the joint shown in FIG. 4, the joint shown in FIG. 9 is the same as most of the components, except that the shape of the collet 43 is changed, and accordingly, the shape of the third latching jaw of the connector 41 is changed. .

The annular portion 43a of the collet 43, more specifically, the portion of the annular portion 43a in close contact with the third locking jaw is formed to be inclined. Accordingly, the inclined surface T6 corresponding to the inclined surface T5 of the annular portion 43a is formed in the third engaging jaw. On the other hand, the inclined surfaces T1 and T2 formed in the chamfer 43c and the nut 42 of the collet 43 are omitted. That is, the inner circumferential surface of the nut 42 has a horizontal shape without an inclined portion, and the chamfer 43c has a stepped shape so that a simple horizontal portion of the nut 42 is accommodated.

When the nut 42 is tightened, the inclined surface T5 of the annular portion 43a is inclined surface T6 of the third engaging jaw by the force applied from the nut 42 to the collet 43. By being in close contact with the flexible tube, the flexible pipe 45 is firmly connected to the connector 41 in the same operation as the above-described embodiment.

Accordingly, the flexible pipe connection joint according to the present invention causes deformation of the flexible pipe to improve the adhesion between the connector and the flexible pipe to firmly support the flexible pipe, and further uses O-ring to further improve the sealing property between the flexible pipe and the connector opening. , When dismantling the flexible pipe from the connector, it is easy to detach the deformed flexible pipe by loosening the nut on the other side of the collet, so that the deformed flexible pipe can be easily removed. There is an advantage.

Claims (18)

A connector having at least one cylindrical opening into which the flexible tube is inserted, and having an external thread formed on an outer circumferential surface thereof; A female thread corresponding to the male thread of the connector is formed on an inner circumferential surface thereof, and a nut having a hole into which the flexible pipe is inserted is formed at one side thereof; A collet disposed inside the nut and formed with a hole into which the flexible tube is inserted, and tightly supporting the flexible tube while being pressed against the connector in the axial direction by being pressed by the nut fastened to the connector; And Joint for flexible pipe connection, characterized in that it comprises an o-ring interposed between the collet and the connector. The method according to claim 1, wherein at least one stepped portion is formed at the inlet of the cylindrical opening of the connector to accommodate the collet and the o-ring so that the collet and the o-ring are in close contact with the engaging jaw formed by the stepped portion. A flexible pipe connection joint. The method of claim 2, wherein the stepped portion is composed of three steps to form three inner and outer engaging jaw, the collet is in close contact with the outer locking jaw, the flexible tube is in close contact with the inner locking jaw, the outer The joint for connecting the flexible pipe, characterized in that the O-ring is accommodated between the collet in close contact with the locking jaw and the intermediate locking jaw. The joint for connecting a flexible pipe according to claim 1, wherein an inclined surface for pressing the collet toward the connector is formed on an inner circumferential surface of the nut, and an inclined surface corresponding to the inclined surface is formed on the collet. The joint for connecting a flexible pipe according to claim 1, wherein an inclined surface is formed on an inner surface of the collet facing the connector, and an inclined surface in which the inclined surface of the collet is in close contact is formed on an inner circumferential surface of the connector. The joint for connecting a flexible pipe of claim 1, wherein protrusions are formed on an outer circumferential surface of the nut to facilitate fastening and detaching of the nut. The joint for connecting a flexible pipe according to claim 1, wherein a wedge portion for firmly supporting the flexible pipe is formed on an inner circumferential surface of the collet. 8. The wedge portion of claim 7, wherein the collet further includes a press portion that protrudes through a hole of a nut, so as to easily detach the wedge portion from the flexible tube, by pressing the press portion toward the center of the flexible tube. Joint for flexible pipe connection, characterized in that configured to be separated from the pipe. The flexible pipe connection joint according to claim 1, wherein a plurality of elongated grooves are formed in the collet along the axial direction from the connector side. The joint of claim 1, wherein the outer circumferential surface of the collet has a tapered shape with a diameter gradually decreasing along the opposite direction of the connector. A connector having at least one cylindrical opening into which the flexible tube is inserted, and having an external thread formed on an outer circumferential surface thereof; A female thread corresponding to the male thread of the connector is formed on an inner circumferential surface thereof, and a nut having a hole into which the flexible pipe is inserted is formed at one side thereof; A collet disposed inside the nut and formed with a hole into which the flexible tube is inserted, and tightly supporting the flexible tube while being pressed against the connector in the axial direction by being pressed by the nut fastened to the connector; And An o-ring interposed between the collet and the connector, At the entrance of the cylindrical opening of the connector, three steps are formed in the inner and outer side and the intermediate locking step, the collet is in close contact with the outer locking jaw, the flexible tube is in close contact with the inner locking jaw, the outer locking The O-ring is accommodated between the collet and the intermediate latching jaw close to the jaw, And an inclined surface for pressing the collet in the connector direction on an inner circumferential surface of the nut, and an inclined surface corresponding to the inclined surface is formed in the collet. 12. The joint of claim 11, wherein protrusions are formed on an outer circumferential surface of the nut to facilitate fastening and detaching of the nut. 12. The joint according to claim 11, wherein a wedge portion for firmly supporting the flexible tube is formed on the inner circumferential surface of the collet. 14. The wedge portion of claim 13, wherein the collet further includes a press portion that protrudes through a hole of a nut so as to easily detach the wedge portion from the flexible tube, by pressing the press portion toward the center of the flexible tube. Joint for flexible pipe connection, characterized in that configured to be separated from the pipe. 12. The joint according to claim 11, wherein a plurality of elongated grooves are formed in the collet in the axial direction. 12. The joint according to claim 11, wherein the outer circumferential surface of the collet has a tapered shape that gradually decreases in diameter along an opposite direction of the connector. A connector having at least one cylindrical opening into which the flexible tube is inserted, and having an external thread formed on an outer circumferential surface thereof; A female thread corresponding to the male thread of the connector is formed on an inner circumferential surface thereof, and a nut having a hole into which the flexible pipe is inserted is formed at one side thereof; It is disposed inside the nut, the hole is inserted into the flexible tube is formed, the inner peripheral surface is formed with a wedge portion, a plurality of long grooves are formed in the axial direction, the outer peripheral surface is gradually diameter along the opposite direction of the connector A collet made of a tapered shape, the wedge portion being firmly supported by the flexible pipe while being pressed in the axial direction by the nut fastened to the connector; And An o-ring interposed between the collet and the connector, At the entrance of the cylindrical opening of the connector, three steps are formed in the inner and outer and middle locking jaw, the collet is in close contact with the outer locking jaw, the flexible pipe is rolled to the inner locking jaw, and the outer locking jaw The O-ring is accommodated between the collet and the intermediate engaging jaw in close contact with, An inclined surface for pressing the collet in the connector direction is formed on an inner circumferential surface of the nut, and an inclined surface corresponding to the inclined surface is formed in the collet, In order to easily detach the wedge portion from the flexible tube, the collet has a pressing portion protruding through a hole of a nut, and the wedge portion is configured to be released from the flexible tube by pressing the pressing portion toward the center of the flexible tube. Joint for flexible pipe connection. 18. The joint of claim 17, wherein protrusions are formed on an outer circumferential surface of the nut to facilitate fastening and detaching of the nut.