KR101435576B1 - A Bush and Conduit Connecting Apparatus Having the Same - Google Patents

Abstract

The present invention relates to a bush and a pipe fitting including the bush. The pipe fitting of the present invention is characterized in that at least one side of a pipe connecting the pipe is inserted with the tip of the pipe inserted therein, and a male screw is formed on the circumference of the pipe A nut having a body and a female thread engageable with the male screw to be coupled to a connecting portion of the body; a cylindrical body fitted to an outer circumferential surface of the tube; and at least one And a baffle which is formed integrally with the body and which includes a baffle including a separation preventing portion for preventing the baffle from coming off by applying pressure to the baffle, thereby significantly improving airtightness in tightening the tube, This has the effect of preventing errors from occurring.

Description

[0001] Bush and Conduit Connecting Apparatus [0002] Having the Same [0003]

The present invention relates to a bush and a pipe fitting including the bush, and more particularly, to a bush and a pipe fitting including the bush, which can improve the airtightness of the pipe by tightening the pipe, .

In general, a pipe (pipe or tube) used for piping for transferring a liquid or a gas is manufactured in a predetermined length according to the standard, so that a plurality of pipes are connected to each other to form a pipe having a desired length and shape. Accordingly, pipe joints of various materials and shapes are used for pipe connection, and such pipe joints are structured such that the fluid to be transferred can be sealed so as not to leak through pipe joints.

Various types of piping are commercially available and used depending on the material. Generally, most of the pipes are made of non-ferrous metal pipes made of light metal such as copper alloy or aluminum, and synthetic pipes using synthetic resin such as PVC. The pipe fittings connecting the pipes are provided with an elbow type connecting port for changing the direction of the pipe according to the use thereof, a tee type connecting pipe for branching the new pipe from the existing pipe, And a union connector for connecting the piping. Various methods for connecting the piping accessories to the piping have been developed and used.

Conventionally, a conventional pipe connection port used for connection of a pipe made of a metal material has a plurality of pipe insertion ports so that at least two pipe ends can be inserted according to the pipe configuration of the hollow body, And a screw is formed on the end of each pipe to be connected so that the pipe can be inserted and inserted into the insertion port of the pipe connection port.

However, since such a conventional pipe connection can not completely seal the pipe connection part, a separate sealing member made of synthetic resin or the like must be wound around the pipe connection part with a screw before the pipe is connected to the pipe connection part. There is a problem that the strength of the pipe connecting portion is considerably lowered due to cutting. In order to solve the above problems, a valve is provided at a connection port for connecting pipes, so that even if a pipe in which the fluid is received is separated, the fluid inside is prevented from leaking to the outside, and when the connection port is fastened, There is a pipe connection which can be connected and disconnected freely.

In addition, in the prior art Patent Document 10-2004-0084507, a connecting hole for connecting a pair of pipes is provided with a hollow tube body, a male screw portion is formed on one side or both sides thereof, And an outer pressing surface formed on an outer circumferential surface of the tube coupled to the insertion end and formed by an inclined surface of the outer circumferential surface to press the outer circumferential surface of the tube, And a female screw portion which is located on the outer peripheral surface of the pressing portion and which is coupled to the male screw portion formed on the outer peripheral surface of the pressing portion in such a shape as to accommodate the pressing portion is formed on the inner surface of the pressing portion, Wherein the fastening portion is provided with a fastening portion.

However, the conventional pipe connector as described above is not only complicated in structure but also has a disadvantage in that the airtightness of the pipe is reduced due to insufficient airtight action.

On the other hand, if the pipe is insufficiently inserted at the beginning of the pipe connection, there is a problem that the pipe is disengaged from the pipe connection port due to the internal pressure generated by the fluid used after the final connection or the used fluid leaks to the outside of the pipe connection port.

This is because it is impossible to confirm the insertion state of the pipe by the naked eye because the pipe connection pipe into which the pipe is inserted is not visible. To prevent this problem, an assembly instruction of pipe connection pipe is established, and in order to visually confirm the pipe insertion depth There is provided means such as marking indicating the position required outside the tube before inserting. However, it is difficult to completely block the problem due to a mistake such as a missing marking or an operator error due to manual work by a worker.

Therefore, there is an urgent need in the art to develop a technique for preventing such a problem from occurring in advance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a bush having a simple structure and excellent airtightness, thereby greatly improving airtightness.

In addition, it is possible to recognize the complete insertion of the tube at the time of insertion of the tube by auditory or tactile sense, and to add a bushing which prevents the once inserted tube from being easily released from the inserted member even before the complete insertion, The present invention has been made in view of the above problems.

In order to achieve the above object, according to the present invention, there is provided a cylindrical body, which is inserted into the outer circumferential surface of the tube, a cut-out part formed at least on the body so that the body is elastically fixed to the outer circumferential surface of the tube, And a release preventing portion formed integrally with the pipe to prevent release by applying pressure to the pipe.

In the present invention, the release preventing portion may be formed of at least one protrusion protruding toward the inside or outside of the body.

The protrusion is formed in the shape of a circular band on the circumferential surface of the body. When the protrusion is protruded to the inside of the body, it is possible to slide in the direction in which the tube is fitted, and in the opposite direction, And the inclined surface may be formed in a direction in which the tube is fitted to prevent separation.

At least two protrusions may be formed on the inner circumferential surface of the body at a predetermined interval. In this case, the protrusions may include a first protrusion formed on a distal end portion of the body in a direction in which the tube is inserted, As shown in FIG.

In the present invention, the inclined surface of the first protrusion may be formed at an angle ranging from 3 to 10 degrees with respect to the center line of the body.

The inclined surface of the second projection may be formed at an angle ranging from 5 to 15 degrees with respect to the center line of the body.

A curved surface may be formed on the opposite side of the inclined surface.

In the present invention, the incision part is formed by cutting the body in the longitudinal direction of the tube, and the angle formed by the incision part about the central axis of the body may be in a range of 1 to 45 degrees.

Meanwhile, the cut-out portion may be formed at regular intervals in the body, and may be formed in a shape of '┎┒' at a predetermined interval at the tip or the rear end of the body.

In the present invention, the body may be formed in a shape of a post-lightening cone shape that becomes narrower from the front end portion to the rear end portion so as to be easily inserted into the tube and to be resiliently fitted to the inner circumferential surface of the tube fitting hole in which the bushing is inserted.

In order to accomplish the above object, the present invention provides a connector for a portable terminal, comprising: a body having at least one connecting portion for connecting a tube with a tip thereof inserted therein and having a male screw formed on an outer circumferential surface of the connecting portion; A nut that is formed with a female screw and is coupled to a connection portion of the body; a cylindrical body fitted to an outer circumferential surface of the tube; at least one incision formed in the body so that the body is elastically fixed to an outer circumferential surface of the tube; And a bush which is formed integrally with the body, and which includes a bounce preventing portion for preventing the bushing from being released by applying pressure to the bushing.

Here, a sealing member may be further included to provide a hermetic function between the connection portion, the nut, and the pipe.

The body may be formed with a recess in which the bush is fitted in an inner circumferential surface of the connection portion so that the body is not released after the bush is inserted.

In the present invention, a body inclined surface may be formed at the inner diameter front end of the connection portion, and a sealing inclined surface may be formed on the entire surface of the sealing member so as to be coupled to the body inclined surface.

In addition, a body inclined surface may be formed at an inner diameter of the connecting portion, and the sealing member may include a first sealing member fitted to the body inclined surface and a second sealing member fitted to a rear surface of the first sealing member.

The first sealing member may have a first sealing front inclined surface formed on the front surface thereof so as to be coupled to the body inclined surface, a first sealing rear surface inclined surface formed on the rear surface thereof, and the second sealing member may be coupled to the first sealing rear surface inclined surface And a second sealing front inclined surface may be formed on the front surface thereof.

In this case, an inclined plane O-ring groove may be formed on the first sealing front inclined face that contacts the body inclined face, and an O-ring may be inserted into the inclined plane O-ring groove

As described above, according to the present invention, it is possible to greatly improve airtightness by connecting the pipes with simple structure and excellent airtightness.

In addition, it is possible to recognize the complete insertion of the tube at the time of insertion of the tube by auditory or tactile sense, and to add a bushing which prevents the once inserted tube from being easily released from the inserted member even before the complete insertion, There is an effect of preventing occurrence.

1 is a perspective view showing an embodiment of a bush according to the present invention.
Fig. 2 is a front view of Fig. 1. Fig.
3 is a sectional view taken along line AA in Fig.
Figure 4 is an exploded perspective view of a pipe fitting to which an embodiment of the bush according to the present invention is applied.
FIGS. 5 to 7 are sectional views showing a state where the pipe jointing apparatus of the present invention is engaged, and are sectional views sequentially showing insertion and insertion of pipes into the pipe jointing apparatus.
8 is a cross-sectional view showing a case where a pipe of the maximum size is inserted into the pipe joint of the present invention.
9 is a perspective view showing another embodiment of the bush according to the present invention.
10 is a front view of Fig. 9. Fig.
11 is a sectional view taken along line BB in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. The structure and operation of the present invention shown in the drawings and described by the drawings are described as at least one embodiment, and the technical ideas and the core structure and operation of the present invention are not limited thereby.

FIG. 1 is a perspective view showing an embodiment of a bush according to the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a sectional view taken along line A-A of FIG.

The bush 10 of the present invention is a part that is fitted to an end of a pipe when a pipe (pipe or tube) used for piping for transferring liquid or gas is connected. In the embodiment of the present invention, A cutout portion 14 formed at least on the body 12 so that the body 12 is elastically fixed to the outer circumferential surface of the tube 12 and a cutout portion 14 integrally formed with the body 12, And a release preventing portion formed by applying pressure to the tube to prevent the tube from escaping.

The body 12 is a cylindrical member having both ends opened to fit through the tube, and is formed to have a predetermined width.

In one embodiment of the present invention, the body 12 is characterized in that a cutout 14 is formed at one side thereof.

That is, the cut-out portion 14 is formed by cutting the body 12 in the longitudinal direction of the tube, and the body 12 can be elastically fixed to the outer circumferential surface of the tube by the cut- The elastic force is obtained.

The body 12 is elastically fixed to the outer circumferential surface of the tube so that the cut-out portion 14 needs to be limited in its forming range to hold the tube. As shown in FIG. 2, The angle (x DEG) formed by the incision portion 14 around the central axis of the body 12 may be formed to have an angle range of 1 to 45 degrees.

If the angle x of the incision 14 is less than 1 or more than 45, it may be difficult to apply elastic force to the outer circumferential surface of the tube, ) To be able to resist the fluid flow. Therefore, it is preferable that the angle (x) formed by the incision portion 14 around the central axis of the body 12 has an angle range of 1 to 45 degrees, but the present invention is not limited thereto, An angle of less than 1 DEG or more than 45 DEG is also possible depending on various conditions for effective insertion of the tube, such as the hardness, strength, material / mechanical properties of the body 12, or tolerances of the outer diameter.

The separation preventing portion may include at least one protrusion 16 or 18 protruding toward the inside or the outside of the body 12. [

In the embodiment of the present invention, the protrusions 16 and 18 are formed in the form of a ring-shaped band on the inner circumferential surface of the body 12, but the present invention is not limited thereto, 12). Also, the protrusions 16 and 18 may be formed in various shapes other than a circular band shape.

When the projections 16 and 18 are formed in a circular strip shape, the projections 16 and 18 may be formed by turning.

At least two protrusions 16 and 18 may be formed on the inner circumferential surface of the body 12 at predetermined intervals. In an exemplary embodiment of the present invention, A first projection 18 formed at a distal end of the body 12 in a direction in which the tube is inserted and a second projection 16 formed at a rear end of the body 12.

The projections 16 and 18 of the present invention may be formed with inclined surfaces in the direction in which the tube is inserted.

That is, a slope is formed in the direction in which the pipe is slidable in the direction in which the pipe is fitted, and in a direction opposite to the direction in which the pipe is fitted to the protrusions (16) and (18) will be.

In the present invention, the inclined surface of the first protrusion 18 may be formed at an angle ranging from 3 to 10 degrees with respect to the center line of the body 12. [ That is, as shown in the enlarged view of FIG. 3, the angle? 1 formed by the first projection 18 with the center line of the body 12 is in the range of 3 to 10 degrees.

An angle? 2 formed by the second projection 16 with the center line of the body 12 in an inclined plane of the second projection 16, that is, an enlarged view of FIG. 3, Lt; RTI ID = 0.0 > 15 < / RTI >

The angular range of the first protrusion 18 and the second protrusion 16 is derived from the most suitable value as a result of a number of experiments by the present applicant. The angle? 2 formed by the inclined surface of the second protrusion 16, Is less than 5 °, the insertion of the pipe is easy, but there is not enough pressure to prevent the pipe from escaping. Therefore, after the pipe is separated by a certain distance from the pipe connection before the start of the work for final tightening of the pipe, There is a possibility that the tube may be detached from the pipe connection port due to the internal pressure generated by the fluid or the used fluid may leak to the outside.

However, the present invention is not limited to this, and it is possible to use an angle less than that according to the hardness or strength of the bush or pipe.

On the other hand, when the angle 2 of the inclined surface of the second projection 16 is 15 degrees or more, insertion of the tube is not easy, so that it may be difficult for an operator to work. Accordingly, the second projections 16 of the bending angle is preferably one or more of the angles in accordance with the second projections, or the hardness or strength of the tube made of a less than 15 ° are possible, of course.

Similarly, when the angle? 1 formed by the inclined surface of the first projection 18 is less than 3 degrees, the insertion of the tube is easy, but the pressure for holding the tube to prevent the tube from being released is insufficient,

As the pipe is separated from the pipe connection port by a certain distance before starting work for longitudinal fastening, there is a problem that the pipe is separated from the pipe connection port due to the internal pressure generated by the fluid used after final tightening of the pipe, .

In addition, when the angle? 1 of the inclined surface of the first projection 18 is 10 degrees or more, insertion of the tube of the maximum size is not easy, so that it may be difficult for an operator to work. Therefore, although the angle? 1 of the inclined surface of the first protrusion 18 is preferably in the range of 3 to 10 degrees, the angle may be less than or equal to the angle range depending on the hardness or strength of the bush or pipe.

In addition, it is preferable that the inner diameters of the first and second projections 18 and 16 are different from each other so that the inner diameter of the first projection 18 and the second projection 16 may be different from each other.

That is, assuming that the inner diameter of the first protrusion 18 formed at the distal end of the bush is dx and the inner diameter of the second protrusion 16 formed at the rear end of the bush is ds, the dx is made larger than ds, But also the tube of the same diameter as the inner diameter of the bush.

When the tube of the standard size is inserted, the tube is brought into contact with the second projection 16 having a smaller inner diameter ds to hold the tube. When the tube of the maximum size is inserted, the second projection 16 And a first projection 18 having a larger inner diameter dx together with the first projection 18 catch the tube.

On the other hand, a curved surface may be formed on the opposite side of the inclined surface of the projections 16 and 18.

In the embodiment of the present invention, two projections 16 and 18 are formed at regular intervals. However, the present invention is not limited thereto, and the projections 16 and 18 may be formed in various numbers such as three to six.

The separation preventing portion of the present invention is formed to protrude inward or outward of the body 12 to apply pressure to the tube by contacting the outer circumferential surface of the tube when inserting the tube and to prevent the tube from being separated by frictional force , And the projections 16 and 18 as described above.

The protrusions 16 and 18 thus formed are resistant to smooth insertion of the tube when the tube is inserted. When the tube pushes the protrusions 16 and 18 and inserts the tube, it induces an impact sound or shock vibration.

That is, when the worker joins the pipe, when the pipe is inserted into the bush 10 while pushing the protrusions 16 and 18, an impact sound is generated or an impact vibration that the operator can feel by hand is generated, Can be perceived by the auditory or tactile sense.

Therefore, it is possible to completely prevent the occurrence of an error by allowing the tube to be completely inserted.

Further, after the tube is inserted into the bushing 10, the protrusions 16 and 18 contact the outer circumferential surface of the tube and friction force is generated. Therefore, even if the pipe is not completely inserted due to inactivity of the worker, it is possible to prevent the pipe from being separated as much as possible.

When the protrusion is protruded to the outside of the body 12, the one end may be formed in the direction in which the tube is inserted or in the opposite direction. In this case, the protrusion is supported on the inner circumferential surface of the pipe connection port where the bush 10 is inserted, and the body 12 serves to hold the pipe.

Meanwhile, the body 12 may be formed in a shape of a post-lightening narrowing shape that becomes narrower from the front end to the rear end so as to be easily inserted into the tube and to be elastically fixed to the inner circumferential surface of the tube fitting hole in which the bush 10 is inserted .

3, the body 12 may be inclined outwardly, and an angle z ° formed by a front end portion and a rear end portion of the body 12 may be in a range of 0.1 to 30 degrees relative to a horizontal plane, Of the total.

The bush 10 of the present invention having such a configuration is applied to a connector for connecting pipes.

Figure 4 is an exploded perspective view of a pipe fitting to which an embodiment of the bush according to the present invention is applied.

The pipe fitting 100 to which the bush 10 of the present invention is applied includes a body 110 having a connection part 112 inserted at the tip of the pipe 130 and connecting the pipe 130 to at least one side thereof, A nut 120 coupled to the connection part 112 of the body 110 and a bush 10 inserted into the inner circumferential surface of the connection part 112.

The body 110 is a union type in which two connecting portions 112 are formed in the left and right sides in a straight line direction and two pipes are respectively inserted in the left and right directions. A male screw is formed on the outer peripheral surface of the connecting portion 112, (120) is coupled to the connection part (112) of the body (110) by forming a female screw fastenable to the male screw.

The present invention is not limited to this. However, the present invention is not limited to this, but may be applied to an elbow connecting the two tubes in an inclined manner, a Tee connecting the three tubes, And it can be applied to a pipe joint connection applied to various devices such as control or measurement of a fluid flowing through a pipe and can be connected to the pipe joint connection device mentioned above.

In addition, the present invention is applicable to all pipe joints made of plastic, steel, and stainless steel. That is, the material of the body 110 and the nut 120 is not limited, and the material of the tube 130 is not limited.

The bush 10 of the pipe joint 100 of the present invention includes a cylindrical body 12 fitted to the outer circumferential surface of the tube 130 and a cylindrical body 12 fitted to the outer circumferential surface of the tube 130, A cutout portion 14 formed at least on the body so as to be elastically fixed to the body 12 and a separation preventing portion formed integrally with the body 12 to prevent the tube 130 from escaping by applying pressure to the tube 130 .

Here, the bush 10 is the same as the above-described embodiment, and a detailed description thereof will be omitted in order to avoid redundancy.

As shown in FIG. 5, the body 110 is formed with a concave portion in which the bush 10 is inserted, on an inner circumferential surface of the connection portion 112 so that the bush 10 is not released.

When the tube 130 is removed after the nut 120 is loosened for the re-tightening, the bush 10 is prevented from coming out together with the bush 10 so that the bush 10 is inserted into the inner circumferential surface of the connection part 112 And is formed by undercut processing to a predetermined depth. Therefore, the diameter of the concave portion (Dbody-undercut) is larger than the diameter of the bushing (10) and the diameter of the inlet (110) of the body (110).

The pipe fitting of the present invention may further include a sealing member 140 (150) that hermetically acts between the connection portion 112, the nut 120 and the pipe 130.

The sealing members 140 and 150 may include a first sealing member 140 and a second sealing member 150. In order to couple the body 110 and the first sealing member 140, A body sloping surface 114 is formed at an inner diameter front end of the connection part 112. A first sealing front sloping surface is formed on the front surface of the first sealing member 140 so as to be coupled to the body sloping surface 110, And a second sealing front inclined surface is formed on the front surface of the second sealing member 150 so as to be coupled to the first sealing rear surface inclined surface.

In addition, an inclined plane O-ring groove (not shown) is formed on the first sealing front inclined surface that contacts the body inclined surface 114, and an O-ring can be inserted into the inclined plane O-ring groove.

Preferably, the O-ring material is made of VITON.

The pipe joint of the present invention has a simple structure in which the first sealing member 140 with the O-ring interposed therebetween and the connecting portion 112, the nut 120 and the pipe 130 are easily separated by the second sealing member 150 There is a remarkable effect that the airtight action can surely be performed.

A method of inserting a tube into the pipe joint apparatus of the present invention having such a structure and finally connecting the pipe joint will be described as follows.

FIGS. 5 to 7 are sectional views showing a state where the pipe jointing apparatus of the present invention is engaged, and are sectional views sequentially showing insertion and insertion of pipes into the pipe jointing apparatus.

The nut 120 is assembled in a state where the bush 10, the first sealing member 140 and the second sealing member 150 are fitted to the inner circumferential surface of the connecting portion 112 of the body 110, ) Is inserted.

At this time, the tube 130 sequentially comes in contact with the first protrusion 18 and the second protrusion 16, and the first protrusion 18 and the second protrusion 16 resist the smooth insertion of the tube An impact sound or an impact vibration is generated while permitting the insertion of the tube through the elastic deformation, and the tip end of the tube 130 is fully inserted into contact with the body 12 of the bush 10.

Thus, when the worker connects the pipe 130, it is possible to recognize that the pipe 130 is completely inserted by the auditory or tactile sense.

When the insertion of the tube 130 is completed, the nut 120 is tightened and completely fastened.

FIG. 7 is a cross-sectional view showing a state in which a tube of the standard size is fully inserted, and FIG. 8 is a sectional view showing a case where a tube of the maximum size is inserted into the tube fitting of the present invention.

As shown in the figure, the bush 10 of the present invention has the first protrusion 18 and the second protrusion 16 protruding by a predetermined amount, and the body 12 is formed to be inclined at a predetermined angle (z °) , It is possible to hold not only a standard but also a tube having the same diameter as the inner diameter of the bush 10.

7, the tube 130 contacts the first protrusion 18 and the second protrusion 16 so that the bush 10 catches the tube 130. As a result, The first protrusion 18 and the second protrusion 16 are slightly pushed outward to hold the tube 130 as shown in FIG.

9 is a perspective view showing another embodiment of the bush according to the present invention, FIG. 10 is a front view of FIG. 9, and FIG. 11 is a sectional view taken along line B-B of FIG.

Another embodiment of the bushing 20 according to the present invention includes a cylindrical body 22 that is fitted to the outer circumferential surface of the tube and a cylindrical body 22 that is secured to the body 22 such that the body 22 is resiliently secured to the outer circumferential surface of the tube. And a separation preventing part 26 formed integrally with the body 22 to prevent the separation of the tube by applying pressure to the tube.

The incision part 24 is formed at a predetermined interval in the body 22 and is formed in a shape of '┎┒' at a predetermined interval at the front end or the rear end of the body 22.

The body 22 has an elastic force that can be elastically fixed to the outer circumferential surface of the tube.

The release preventing portion 26 may include at least one protrusion 26 protruding toward the inside or the outside of the body 22.

Although the protrusions 26 are shown in the form of a ring-shaped band on the inner circumferential surface of the body 22, the present invention is not limited thereto, and the protrusions may be formed on the inner circumferential surface of the body 22 But also on the outer circumferential surface. Also, the shape of the protrusions 26 may be not limited to the shape of a ring-shaped band but may be variously formed.

The projection 26 is formed with an inclined surface in a direction in which the tube is inserted so that it can slide in a direction in which the tube is fitted and is prevented from coming out of contact with the outer peripheral surface of the tube in the opposite direction.

According to another embodiment of the present invention, the protrusion 26 prevents the inserted tube from being easily detached.

The above description is only illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. It should be noted that the embodiments disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

10: Bush 12: Body
14: incision section 16: second projection
18: first projection
110: Body 112: Connection
114: body slope 120: nut
140: first sealing member 150: second sealing member

Claims (30)

delete delete delete delete delete delete delete delete delete delete delete delete A body having at least one connecting portion for connecting the tube with the tip of the tube inserted therein and having a male screw formed on an outer circumferential surface of the connecting portion;
A nut having a female screw fastened to the male screw and coupled to a connecting portion of the body; And
At least one cut-out portion formed in the body so as to be elastically fixed to the outer circumferential surface of the tube, and a cutout portion formed integrally with the body, A bush comprising a departure-preventing portion for preventing bushing;
/ RTI >
The separation preventing portion may include at least one protrusion protruding toward the inside or outside of the body,
The body is formed in a shape of an optical fiber after being narrowed from the front end portion to the rear end portion so as to be easily inserted into the tube and to be elastically fixed to the inner circumferential surface of the tube fitting hole in which the bush is inserted,
Wherein the bush is formed with an inner circumferential surface of the connecting portion so as to prevent the bush from being separated after the bush is inserted, wherein a recess is formed in the inner surface of the connecting portion to undercut the bush to a predetermined depth. 14. The method of claim 13,
Further comprising a sealing member that hermetically acts between the connection, the nut and the tube. delete 14. The method of claim 13,
The protrusions are formed in the shape of a circular band on the circumferential surface of the body,
When the projection is protruded to the inside of the body, an inclined surface is formed in a direction in which the tube is slidable in a direction in which the tube is fitted, and in a direction opposite to the direction, Wherein the pipe joint is made of a metal. 18. The method of claim 16,
Wherein at least two protrusions are formed on the inner circumferential surface of the body at predetermined intervals. 18. The method of claim 17,
The protrusion includes a first protrusion formed at a distal end of the body in a direction in which the tube is inserted,
And a second projection formed at a rear end of the body. 19. The method of claim 18,
Wherein the inclined surface of the first projection has an angle ranging from 3 to 10 degrees with respect to a center line of the body. 19. The method of claim 18,
Wherein the inclined surface of the second projection has an angle ranging from 5 to 15 degrees with respect to a center line of the body. 18. The method of claim 16,
And a bent surface is formed on the opposite side of the inclined surface. 14. The method of claim 13,
The cut-out portion is formed by cutting the body in the longitudinal direction of the tube
Wherein an angle formed by the incision portion about the center axis of the body is in a range of 1 to 45 degrees. 14. The method of claim 13,
Wherein the cut-out portion is formed at a predetermined interval in the body, and is formed in a shape of '┎┒' at a predetermined interval at the tip end or the rear end portion of the body. 24. The method of claim 23,
The separation preventing portion is formed of a protrusion formed on the inner circumferential surface of the body in the form of a circular band,
Wherein the protrusion is slidable in a direction in which the tube is fitted, and in a direction opposite to the protrusion, an inclined surface is formed in a direction in which the tube is fitted so as to prevent the tube from coming into contact with the outer peripheral surface of the tube. delete delete 15. The method of claim 14,
A body inclined surface is formed at an inner diameter front end of the connecting portion,
Wherein the sealing member is formed with a sealing inclined surface at its front surface so as to be coupled to the body inclined surface. 15. The method of claim 14,
A body inclined surface is formed at an inner diameter front end of the connecting portion,
Wherein the sealing member comprises a first sealing member fitted to the body inclined surface and a second sealing member fitted to a rear surface of the first sealing member. 29. The method of claim 28,
The first sealing member has a first sealing front inclined surface formed on a front surface thereof so as to be coupled to the body inclined surface, a first sealing rear surface inclined surface formed on a rear surface thereof,
And the second sealing member is formed with a second sealing front inclined surface on its front surface so as to be coupled to the first sealing rear surface inclined surface. 29. The method of claim 29,
Wherein an inclined plane O-ring groove is formed in the first sealing front inclined face that is in contact with the body inclined face, and an O-ring is inserted into the inclined plane O-ring groove.

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