KR100764845B1 - Composite type variable angle connector - Google Patents

Abstract

A composite type variable angle connector is provided to allow for smooth flow of fluid by forming the inside of a joint into a curved shape and to prevent deformation of an adjustment angle caused due to vibration or water hammering. A composite type variable angle connector includes a first joint(10) and a second joint(20). The first joint has one side with a first curved portion(12) and the other side with a first connection portion(11) to be coupled to one side of a pipe(3). The first connection portion is formed integrally with the first curved portion. The second joint has one side with a second curved portion(22) having an outer surface with a curvature corresponding to the curvature of the inside of the first curved portion, and the other side with a second connection portion(21) to be coupled to one side of a pipe(4). The second connection portion is formed integrally with the second curved portion. The front end circumferences of the first and second curved portions are formed in parallel to a tilt angle reference line(Y1-Y1') which is inclined by a predetermined angle(theta1) with respect to a vertical axis center line(Y-Y') formed by the first and second curved portions. The first curved portion has an inner surface on which a protrusion(14) is formed such that a front end of the second curved portion gets caught at the protrusion. The protrusion has an outer circumference(14a) parallel to the tilt angle reference line.

Description

Composite Type Variable Angle Connector

1 is an exploded perspective view of a composite variable angle joint according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the composite variable angle joint.

3 is a view for explaining the angle changed by the second binding body in the vertical variable left and right pivot in the composite variable angle fitting pipe of the present invention.

4A and 4B are views for explaining an angle at which the second binding body is changed by rotating about the rotation axis O-X1 in the composite variable angle fitting pipe of the present invention.

5 is a view for explaining the angle changed by the second binding body in the composite variable angle fitting pipe of the present invention to rotate in the vertical and horizontal direction while rotating about the rotation axis (O-X1).

6A is a schematic configuration diagram of a conventional parallel variable angle fitting tube, and FIG. 6B is a schematic configuration diagram of a composite variable angle fitting tube of the present invention.

Figure 7a is a view showing a variable angle adjustment range of a conventional parallel variable angle fitting tube viewed from the right side of Figure 6a, Figure 7b is a variable angle adjustment range of the compound variable angle fitting tube of the present invention viewed from the right side of Figure 6b It is a figure which shows.

8 and 9 show another fastening step to be applied to the composite variable-angle joint of the present invention.

Figure 10 shows another embodiment of a compound variable angle joint according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: first binding body 20: second binding body

11: first connecting portion 21: second connecting portion

12: first curved portion 22: second curved portion

14: step 30: fastening means

40: packing

The present invention relates to a compound variable angle joint pipe for connecting a pair of pipes, and more specifically, it is possible to obtain a large and variable variable angle than conventional variable angle joint pipe, to facilitate fluid flow, and to adjust the angle of adjustment The present invention relates to a compound variable angle joint tube in which deformation is prevented.

As a conventional one that can be installed while adjusting the angle of the pipe arbitrarily as in the present invention, the domestic utility model registration No. 284649 "Inverter installation easy to adjust the angle of the pipe joint" and the utility model registration No. 296562 " Variable joint pipe "and utility model registration No. 311190" variable elbow for sewer pipe "and patent application No. 2002-45671" pipe connection device for upper and sewer pipes "and US Patent No. 4917408" adjustment ball fitting device for fluid distribution " Is known.

Utility Model Registration No. 284649 (Inverter installation easy to adjust the angle of pipe joints) is formed at the ends of the inlet pipe and the outlet pipe to form the same shape grooves inside and outside to combine with each other, the angle of the combined grooves Can be changed arbitrarily, but if the angle of the groove is changed (adjusted), the space of the outer groove that is closed by the inner groove increases according to the size of the angle. There is a problem that is gradually narrowed, there is a problem that the fluid to be distributed is not smoothly flowing while colliding with the inner groove.

Utility Model Registration No. 296562 (Variable Joint) forms a communication port (angle generating tube) integrally in the cylindrical tube in forming the first body and the second body, but is not included in the communication hole (angle generating tube) of the first body. Forming a connection cap and the communication port (angle generating tube) of the second body is to form a connection portion to insert the connection portion to the connection cap to be coupled.

Utility Model Registration No. 311190 (variable elbow for sewage pipe) forms a pair of pipe joints, and each pipe joint forms an angle generating tube integrally in the cylindrical pipe, but corresponds to the arc joint and arc protrusion at the end of each pipe joint. Formed so that it can be bound and released while rotating in the forward and reverse state in the combined state of the arc coupling portion and the arc projection.

However, when they are connected to the pipe or the body connecting the pipe to each other, by inserting the connecting portion to the connecting cap, or by inserting the corresponding arc-shaped coupling portion and the arc projection in the state of insertion and rotation, simply insert, Since there is no coupling (fastening) means for connecting and firmly coupling, there is a problem that can not be tightly coupled (fastening) due to the weak binding force, the problem of leaking when the pressure of the circulating fluid is strong because the binding force is weak Is generated, even if the installation by adjusting the angle there is a problem that not only the watertight action is dropped due to vibration or water hammer (Water Hammer phenomenon) action but also the adjustment angle is deformed.

In addition, Patent Application No. 2002-45671 (pipe connection device for water and sewage pipe) and U.S. Patent No. 4917408 (fluid ball adjusting device for fluid flow) have a curved portion at the end of the pipe extension portion to which one pipe (pipe) is connected. The inside of the curved part is formed with a movable part which is rotated along the inner surface, but the inside of the movable part is connected to the other pipe (pipe), and when the other pipe (pipe) is rotated to change the angle, the movable part rotates inside the curved part. As the angle is changed.

However, since the movable part is simply inserted in the inside of the curved part, even if the sealed state is maintained by the packing, if the installed state is long or the pressure inside is strongly applied, the sealing ability of the packing is reduced and water leakage occurs. When the angle of the pipe (pipe) to be connected is changed, since the movable part built in the inside of the curved part reduces the internal space (area) of the curved part, there is a problem that fluid cannot flow smoothly. When the fluid discharged from the (pipe) collides with the inner surface of the curved portion, there is a problem that the fluid does not flow smoothly, as well as vibration and noise, and the watertight action may be reduced due to the vibration or water hammer action. In addition, there is a problem that the problem of the adjustment angle is deformed. .

Another conventionally known materials port of Japanese Utility Model Publication Nos. 5-1088 and 6-80092 are known, which form an enlarged diameter part and an annular sphere at each end of a pair of splices, but are annular. The ball is inserted into the enlarged diameter part to allow free sliding (rotation). A packing is provided on the opposite surface of the enlarged diameter part and the annular sphere to have a sealing ability.

However, if the installation state is long or the internal pressure is strong, the sealing capacity of the packing may be lowered and water leakage may occur.If the angle of the pipe (pipe) to be connected is changed, the diameter of the pipe and the annular sphere may be reduced. Since the edges are generated between the fluids that flow into the corners, the fluids not only flow smoothly, but also cause vibrations and noises, and the water-tightness of the fluids decreases due to vibration or water hammer. There is a problem that the problem that the adjustment angle is deformed occurs.

The present invention has been proposed in order to solve the above problems, it is possible to obtain a larger variable angle than the conventional variable angle joint pipe, the composite variable angle joint pipe to smooth the fluid flow, the deformation of the adjustment angle is prevented To provide.

According to a configuration of the present invention for achieving the above object, in the variable angle joint for connecting a pair of pipes, the first curved portion forming a sphere on one side is formed, the other side is coupled to one side of the tube A first binding member having a first connecting portion integrally formed with the first curved portion; A second curved portion having an outer circumferential surface of a curvature corresponding to the curvature inside the first curved portion is formed on one side thereof so as to be pivotable in surface contact with the inside of the first curved portion, and a second connecting portion coupled to one side of the tube is formed on the other side thereof. And a second binding body integrally formed with the second curved portion, wherein the distal outer circumference of the first curved portion and the distal outer circumference of the second curved portion are formed by the first curved portion and the second curved portion. There is provided a compound variable angle fitting tube, characterized in that it is formed parallel to the inclined angle reference line inclined by a predetermined angle with respect to the vertical axis centerline.

The second binding body is characterized in that the front end of the tube is inserted into the second curved portion.

In the composite variable angle joint according to the present invention, a stepped portion is formed on the inner circumferential surface of the first curved portion to stop the tip of the second curved portion, and the stepped outer circumference by the stepped portion is formed to be parallel to the inclination angle reference line. It features.

The composite variable-angle joint according to the present invention is characterized in that it further comprises a fastening means configured to detachably fasten the first and the second binding member.

The fastening means may be screwed with the tip of the first curved portion while pushing the outer circumferential surface of the second curved portion through the second connecting portion.

The fastening means is characterized in that the bolt / nut is coupled to the front end of the first curved portion while pushing the outer peripheral surface of the second curved portion through the second connecting portion.

The composite variable angle fitting tube according to the present invention is characterized in that it further comprises a packing is formed in the outer peripheral surface of the front end of the second curved portion, embedded in the groove is in close contact / compression on the inner peripheral surface of the first curved portion.

Compound variable angle joint tube according to the present invention is characterized in that the locking step is formed so that the front end of the pipe is connected to the inner surface of the first connection portion and the second connection portion is stopped.

Hereinafter, with reference to the accompanying drawings illustrating a preferred embodiment of the composite variable-angle joint according to the present invention.

1 is an exploded perspective view of a composite variable angle joint according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the composite variable angle joint.

The composite variable-angle joint pipe of the present invention includes a first binding body 10, a second binding body 20, a fastening means 30, and the like, for connecting a pair of pipes 3 and 4.

One side of the first binding member 10 is formed with a convex first curved portion 12 is formed, the other side of the first binding member 10, the first connecting portion 11 extending from one end of the first curved portion 12 ) Is formed.

One side of the second binding body 20 is formed with a second curved portion 22 having a spherical shape similar to the first binding body 10, and one end of the second curved portion 22 on the other side of the second binding body 20. A second connection portion 21 extending from is formed.

The first connection portion 11 and the second connection portion 21 of the tubular shape are respectively coupled to one side of the tube (3, 4), it can be inserted into the tube (3, 4) formed in a generally cylindrical shape therein Make sure On the other hand, the inner surface of each of the first connecting portion 11 and the second connecting portion 21 is provided with a locking step (13, 23) so that the front end of the tube (3, 4) to be inserted is caught and stopped.

The second curved portion 22 is inserted into the first curved portion so that the tip portion thereof overlaps with the inside of the first curved portion 12. Specifically, the outer circumferential surface of the second curved portion 22 has a curvature corresponding to the curvature inside the first curved portion 12 such that the outer circumferential surface of the second curved portion 22 is pivotable while being in surface contact with the inner side of the first curved portion 12.

The first curved portion 12 and the second curved portion 22 have a shape in which a part of a sphere that is empty inside is obliquely cut. Since the first curved portion 12 and the second curved portion 22 formed in a spherical shape form a single spherical shape having a common center O, the second curved portion 22 inserted into the first curved portion 12 is formed. It becomes possible to turn smoothly in the surface contact state.

With this configuration, the second curved portion 22 can be rotated by a predetermined angle in various directions up, down, left and right inside the first curved portion 12.

In addition, since the insides of the first curved portion 12 and the second curved portion 22 connected to each other are formed in a curved shape that is maintained in a circular shape, fluid flow through the pipes 3 and 4 is smooth.

For the sake of clarity, the direction axis will be set and explained.

As shown in FIG. 2, the horizontal lines passing through the center of the pipes 3 and 4 in a state where the pipes 3 and 4 coupled to both ends of the composite variable-angle joint pipe of the present invention are installed to be horizontal are formed. X-X '), a line perpendicular to the horizontal axis center line X-X' while passing through the spherical center point O is referred to as a vertical axis center line (Y-Y '). That is, the horizontal axis center line X-X 'and the vertical axis center line Y-Y' cross each other at the center point O of the spherical shape.

The first curved portion 12 and the second curved portion 22 have a shape in which a portion of the hollow sphere is hollowed out obliquely, as shown in FIG. 2, the front end of the first curved portion 12. The tip outer circumference 26 of the outer circumference line 16 and the second curved portion 22 is parallel to the inclination angle reference line Y1-Y1 'inclined by an angle θ ₁ to the left with respect to the vertical axis center line Y-Y'. It is formed to. Therefore, the upper portion of the second curved portion 22 extends longer than the lower portion so that the upper portion of the second curved portion 22 is further biased to the left based on the vertical axis center line Y-Y 'in FIG. 2.

As described above, the tip outer circumference 16 of the first curved portion 12 and the tip outer circumference 26 of the second curved portion 22 are formed to be inclined, so that the conventional variable angle joint pipe in the condition that the outer circumferential surface diameters of the second curved portion are the same. A larger angle change can be obtained, which will be described later.

The stepped portion 14 is provided on the inner circumferential surface of the first curved portion 12, and the front end of the second curved portion 22 is caught and stopped by the stepped portion 14.

Therefore, in order to change the angle of the tube 4 coupled to the second connecting portion 21, the second curved portion 22 may be rotated in various directions up, down, left and right by the maximum angle θ ₂ .

By forming the step 14 on the inner circumferential surface of the first curved portion 12 as described above, to solve the problem that the distal end of the second curved portion 22 is moved to the position to hinder the flow of the fluid out of the first curved portion 12 Can be.

Meanwhile, as shown in FIG. 2, the stepped outer circumferential line 14a is inclined angle reference line like the tip outer circumferential line 16 of the first curved portion 12 and the tip outer circumferential line 26 of the second curved portion 22. Y1-Y1 '). Therefore, the second curved portion 22 has the same angle adjustment range (maximum angle θ ₂ ) in any of the up, down, left and right directions in the state of FIG. ₂ .

As shown in FIG. 2, when the angle between the inclination angle reference line Y1-Y1 ′ and the tip outer peripheral line 26 of the second curved portion 22 is θ ₃ at the spherical center point O, θ ₃ is obtained. ₃ must be greater than or equal to θ ₂ .

If θ ₃ is set smaller than θ ₂ , when one end of the second curved portion 22 is stopped by the step 14, the other end of the second curved portion 22 corresponding to the first curved portion ( 12) It will get out of the interior.

That is, it is possible to change the angles of the pipes 3 and 4 without separating or detaching the first curved portion 12 and the second curved portion 22 from each other only when the relationship of θ ₃ ≧ θ ₂ is established.

On the other hand, in order to secure the maximum variable angle, it is preferable to form the tip portion of the second curved portion with a length satisfying the relationship of θ ₃ = θ ₂ .

The composite variable-angle fitting tube of the present invention may include a packing 40 to secure a tight seal in a state where the inner circumferential surface of the first curved portion 12 and the outer circumferential surface of the second curved portion 22 are in surface contact.

Specifically, a groove is formed in the outer peripheral surface of the tip of the second curved portion 22, and the packing 40 is embedded in the groove. Since the packing 40 is in close contact with the inner circumferential surface of the first curved portion 12, the packing 40 ensures a sealed state between the inner circumferential surface of the first curved portion 12 and the outer circumferential surface of the second curved portion 22.

Meanwhile, the packing 40 is made of an elastic material, and various shapes of packing 40 may be used. In this embodiment, the circular packing 40 is used.

The composite variable angle fitting tube of the present invention may further include a fastening means 30 configured to detachably fasten the first binding member 10 and the second binding member 20.

As shown in FIG. 2, the fastening means 30 is formed in a cap shape having a hole formed to pass through the second connecting portion 21 to push the outer circumferential surface of the second curved portion 22.

Specifically, the female screw 31 is formed on the inner circumferential surface of the fastening means 30 so that the first curved portion 12 is engaged with the male screw 18 formed on the outer circumferential surface of the distal end, so that the fastening means 30 has the first curved portion 12. ) Is screwed with the front end.

The diameter D2 of the hole of the fastening means 30 is smaller than the outer diameter D1 of the outer circumferential surface of the second curved portion 22. Therefore, the fastening means 30 is coupled with the tip of the first curved portion 12 while the circumferential surface of the hole pushes the outer circumferential surface of the second curved portion 22 to increase the sealing force and the binding force.

On the other hand, in the present embodiment, the male screw 18 is formed on the outer peripheral surface of the front end of the first curved portion 12 and the female screw 31 is formed on the inner peripheral surface of the fastening means 30, the male screw 18 and the female screw 31 The formation positions of may be interchanged with each other.

The present invention can prevent the adjustment angle from being deformed due to vibration or water hammer by using the fastening means 30 having the above configuration.

However, since the fastening means 30 is caught at the boundary point of the second curved portion 22 and the second connecting portion 21, there is room to limit the variable angle adjustment range of the present invention, the range to secure the required sealing force and binding force It is preferable to appropriately select the shape and size of the fastening means 30 within.

In addition, the fastening means 30a may be configured to further improve the sealing force by further including an O-ring 33 as shown in FIG. 8.

In addition, the fastening means 30b may be configured to be coupled by the front end of the flange-shaped first curved portion 12 and the bolt 37 / nut 35 as shown in FIG.

Further, the coupling structure of the front end of the fastening means 30 and the first curved portion 12 is not limited to a specific coupling method may be replaced by any one of a variety of commercially available coupling methods.

Hereinafter, the operation relationship of the compound variable angle joint according to the present invention with reference to FIGS.

3 is a view for explaining the angle changed by the second binding body 20 is rotated in the vertical, left and right directions in the composite variable angle fitting pipe of the present invention.

Before the fastening means 30 is completely coupled to the tip of the first curved portion 12, the angle of the second curved portion 22 inserted into the first curved portion 12 is adjusted.

In detail, the second curved portion 22 may pivot in various directions in up, down, left, and right directions while being in surface contact with the inside of the first curved portion 12. At this time, since the turning is possible until the front end of the second curved portion is caught by the step 14 formed on the inner circumferential surface of the first curved portion 12, the angle may be changed by up to θ ₂ in any direction.

Therefore, as shown in FIG. 3, when the tip of the second curved portion 22 is stopped by the step 14, the second binding body 20 is angled by θ ₂ from the horizontal axis center line X-X '. Is changed.

4A and 4B are views for explaining an angle changed by rotating the second binding member 20 based on the rotation axis O-X1 in the composite variable-angle fitting tube of the present invention.

As shown in FIG. 4A, when the line perpendicular to the tip outer peripheral line 26 of the second curved portion 22 and passing through the spherical center point O is called the rotation axis O-X1, the rotation axis O-X1 ) And the horizontal axis center line (X-X ') becomes θ ₁ .

Therefore, when the second binding member 20 is rotated 180 ° clockwise with respect to the rotation axis O-X1 (that is, the tip outer peripheral line 26 of the second curved portion 22 rotates while maintaining the initial state). 4b, the second binding body 20 remains inclined at an angle twice the angle of θ ₁ from the horizontal axis center line X-X '. That is, the angle of the 2nd binding body 20 is changed by 2 * (theta) ₁ from the horizontal axis center line X-X '.

5 is a view for explaining the angle changed by the second binding body 20 is rotated in the vertically and horizontally and simultaneously rotated relative to the rotation axis (O-X1) in the composite variable-angle fitting pipe of the present invention.

As shown in FIG. 4B, the composite variable angle fitting tube of the present invention rotates the second binding body 20 about the rotation axis O-X1 so that the angle is 2 × θ ₁ from the horizontal axis center line X-X ′. In the changed state, as shown in FIG. 3, it is possible to further angle change the second binding body 20 by a maximum of θ ₂ .

By the above operation, the composite variable angle fitting tube of the present invention can obtain a larger angle change than the conventional variable angle fitting tube under the condition that the outer circumferential diameter of the second curved portion is the same. That is, the angle can be changed up to 2 × θ ₁ + θ ₂ from the horizontal axis center line X-X '. This is an effect exhibited by the structure in which the tip outer periphery 16 of the 1st curved part 12 and the tip outer periphery 26 of the 2nd curved part 22 are inclined as mentioned above.

More specifically, the variable angle adjustment range of the present invention will be described with reference to FIGS. 6 and 7.

6A is a schematic configuration diagram of a conventional parallel variable angle fitting tube, and FIG. 6B is a schematic configuration diagram of a composite variable angle fitting tube of the present invention.

In addition, Figure 7a is a view showing a variable angle adjustment range of the conventional parallel variable angle fitting pipe viewed from the right side of Figure 6a, Figure 7b is a variable angle control of the compound variable angle fitting pipe of the present invention seen from the right side of Figure 6b It is a figure which shows a range.

Θ in FIG. 6 indicates an angle between the vertical axis center line (Y-Y ') and the stepped portion of the first curved portion. In FIG. 6, the conventional foldable variable-angle fitting tube and the composite variable-angle fitting tube of the present invention have the same θ value, that is, the condition of the same outer circumferential diameter of the second curved portion.

At this time, the conventional parallel variable angle pipe has a variable angle of ± θ / 2 relative to the horizontal axis center line (X-X ') by turning the second curved portion in the vertical, horizontal direction.

In contrast, the composite variable-angle fitting tube of the present invention has a variable angle of ± ₂ relative to the horizontal center line (X-X ') by pivoting the second curved portion in the vertical, horizontal direction, where θ ₂ = ( The relationship of θ-θ ₁ ) / 2 is established.

Therefore, the variable angle adjustment range obtained by turning the second curved portion in the vertical, left and right directions in the composite variable angle fitting tube of the present invention is reduced than the variable angle adjusting range of the conventional variable angle fitting tube.

However, as described above, the composite variable angle joint tube may obtain an additional variable angle of 2 × θ ₁ by rotating the second curved portion about the rotation axis O-X1 (see FIG. 4A).

As a result, the composite variable-angle fitting tube of the present invention has a variable angle adjustment range of 2 × θ ₁ ± θ ₂ so that the variable angle larger than the conventional parallel variable angle fitting tube under the condition that the outer circumferential diameter of the second curved portion is the same. The adjustment range can be obtained.

Therefore, the problem of excessively increasing the size of the variable-angle fitting tube for the required variable angle and interfering with other devices and having an aesthetic appearance can be solved by the present invention having the above configuration.

For example, when θ = 36 ° in FIG. 6, the variable angle control range (± θ / 2) of a conventional parallel variable angle fitting tube is ± 18 °, that is, 36 °.

When the inclined angle θ ₁ of the inclination angle reference line Y1-Y1 'is set to 15 °, θ ₂ in FIG. 6 is (θ-θ ₁ ) / 2 = (36 °-15 °) / 2 = 10.5 °, and the variable angle adjustment range (2 × θ ₁ ± θ ₂ ) of the composite variable angle fittings of the present invention is 2 × 15 ° ± 10.5 °, that is 51 ° by 15 ° than the conventional parallel variable angle fittings Large variable angle adjustment range

Figure 10 shows another embodiment of a compound variable angle joint according to the present invention.

As shown in FIG. 10, the second binding body 20a of the present embodiment has a structure in which the connecting portion and the curved portion are formed in one shape, and the curved portion of the present embodiment has the second connecting portion 21 in the above-described embodiment. Will also be in charge of That is, the front end of the tube 4 to be inserted is caught by the locking jaw formed inside the curved portion of the second binding body 20a and stopped.

Meanwhile, an O-ring member 7 may be provided between the second binding member 20a and the inserted tube 4 to improve the sealing state between the second binding member 20a and the inserted tube 4. have.

In addition, in this embodiment, only the structure of the 2nd binding body 20a is changed, but it is also possible to change the structure of the 1st binding body 10 similarly to the structure of the 2nd binding body 20a.

As mentioned above, although this invention was demonstrated in detail using the preferable Example, the scope of the present invention is not limited to a specific Example and should be interpreted by the attached Claim. In addition, those skilled in the art should understand that many modifications and variations are possible without departing from the scope of the present invention.

The composite variable angle fitting tube of the present invention as described above can be obtained in a conventional variable angle fitting tube under the condition that the outer circumferential diameter of the second curved portion is equal to the tip outer peripheral line of the first curved portion and the outer peripheral edge of the second curved portion are inclined. It is larger than the variable angle and has various variable angles.

 Therefore, the size of the variable-angle fitting tube is excessively increased for the required variable angle, thereby solving the problem of interference with other devices and unsatisfactory appearance.

In addition, it is possible to smoothly flow the fluid by forming the inside of the binding body connected to each other in a circular shape, and has the effect of preventing the adjustment angle is deformed by the vibration or water hammer action using the fastening means.

Claims (7)

In the variable angle joint for connecting a pair of pipes, The first curved portion 12 having a spherical shape is formed on one side, and the first binding portion 10 integrally formed with the first curved portion 12 has a first connection portion 11 coupled to one side of the tube 3 on the other side. ); And A second curved portion 22 having an outer circumferential surface of a curvature corresponding to the curvature of the inner side of the first curved portion 12 is formed so as to be able to pivot in a state of being in surface contact with the inside of the first curved portion 12 on one side thereof, and on the other side a tube ( And a second binding member 20 which is coupled to one side of the 4) and is formed integrally with the second curved portion 22. The outer circumferential line 16 of the first curved portion and the outer circumferential line 26 of the second curved portion have a circular vertical center line Y-Y 'formed by the first curved portion and the second curved portion. It is formed to be parallel to the inclination angle reference line (Y1-Y1 ') inclined by a predetermined angle (θ ₁ ), The stepped portion 14 is formed on the inner circumferential surface of the first curved portion 12 so that the tip end of the second curved portion 22 is stopped, and the stepped outer circumferential line 14a by the stepped portion 14 is the inclined angle reference line ( Y1-Y1 ') compound variable angle joint characterized in that formed in parallel. The method of claim 1, The second binding body (20a) is a compound variable angle joint tube, characterized in that the front end of the tube (4) is inserted into the second curved portion (22). delete The method according to claim 1 or 2, Compound variable angle joint pipe further comprises a fastening means (30) configured to detachably fasten the first binding member (10) and the second binding member (20). The method of claim 4, wherein The fastening means 30, Compound variable angle fitting tube, characterized in that the screw is coupled to the front end of the first curved portion 12 while pushing the outer peripheral surface of the second curved portion 22 through the second connecting portion (21). The method of claim 4, wherein The fastening means 30, Compound variable angle fitting pipe, characterized in that the bolt / nut is coupled to the front end of the first curved portion 12 while pushing the outer peripheral surface of the second curved portion 22 through the second connecting portion (21). The method according to claim 1 or 2, Grooves are formed in the outer peripheral surface of the tip of the second curved portion 22, Composite variable-angle fitting tube further comprises a packing (40) embedded in the groove to be in close contact with the inner circumferential surface of the first curved portion (12).

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