Pipeline connecting device

Abstract

The pipe connection device according to the present invention comprises: an adapter comprising a hollow pipe and an annular protruding end extending from one end in the length direction of the hollow pipe in the diameter direction of the hollow pipe; an annular flange which is formed in an annular shape around the outer peripheral surface of the protruding end, and which is coupled so as to be capable of rotating about the longitudinal central axis of the hollow tube, but not capable of moving in the longitudinal direction of the hollow tube; and a fastening unit that crimps one ends of two hollow tubes different from each other in the longitudinal direction by coupling two annular flanges different from each other in a stacked structure. The pipe connecting device according to the present invention can more easily and stably connect two pipes, and does not require a separate stopper for preventing the rotation flange from moving in the length direction of the pipes, thereby simplifying the internal structure, and having the advantage of being capable of significantly improving the airtightness between the two pipes.

Description

TECHNICAL FIELD

[0001] The present invention relates to a device for connecting pipes different from each other in a row by combining two flanges in a stacked structure. More particularly, the present invention relates to a pipe connecting device in which flanges are installed in a rotatable structure so as to easily install a fastening unit for combining the two flanges. BACKGROUND

[0002] Generally, a piping is used to transport fluids in various facilities from a home to an industrial site. The piping is composed of a plurality of pipes connecting a supply point and a demand point of the fluid.

[0003] The plurality of pipes constituting the piping are connected in series by various pipe connecting devices. Between the pipes, various valves for controlling the flow of the fluid are also provided. In an actual piping construction site, a certain length of pipe is buried in the ground or installed on the ground in sequence, and the respective pipes are connected with a pipe connector to complete the piping.

[0004] A very wide variety of pipe connecting devices have been developed and supplied, one of which is a flange. The flange is a ring-shaped fitting welded to a pipe in order to connect the pipe in a lengthwise direction, and is combined with the other in a state of aligning the pipe ends by a plurality of bolts and nuts.

[0005] The flange itself is a ring-shaped member having a plurality of bolt holes, and is fixed by welding to the outer circumferential surface of the pipe. The flanges of the pipes to be connected and combined with each other are inserted into the bolts through the bolt holes in a state of being in close contact with each other and the nuts are tightened from the opposite side, and thus the connection of the pipes can be completed.

[0006] However, the above-mentioned ordinary flange is completely welded to the pipe, and thus it is inconvenient in that it is not easy to align the flanges opposite to each other. That is, it is unexpectedly difficult and very troublesome to align the bolt holes of the flanges facing each other in a straight line.

[0007] In order to align the bolt holes in a straight line, for example, it is necessary to rotate the pipe in the left and right directions little by little in a state of lifting one side of the pipe, but it is very difficult to lift a heavy pipe and it is a work requiring equipment and manpower.

[0008] In order to solve the above-mentioned problems, a "flange device for pipe connection" (Korean Registered Patent No. 10-1547135) capable of rotating the flange has been proposed, but since the flange device for pipe connection requires a separate stopper to limit the movement of the rotating flange in order to prevent the movement of the rotating flange in the lengthwise direction of the pipe, it not only has a complex structure, but also has the disadvantage of taking a long time for construction.

[0009] Moreover, when connecting two pipes using the pipe connecting flange device, the combined rotary flange and the fixed flange are simply combined in a stacked structure, and thus there is a risk of fluid leakage between the rotary flange and the fixed flange. When the rotary flange is manufactured to be slightly thicker than the design value, a gap can occur between the ends of the two pipes, and when the rotary flange and the fixed flange are repeatedly assembled and disassembled, there is a problem in that the air tightness can be reduced due to wear in the area where pressure is applied.

[0010] (PRIOR ART DOCUMENT)

[0011] (PATENT DOCUMENT)

[0012] (PATENT DOCUMENT 0001) KR10-1547135B1 SUMMARY

[0013] PROBLEMS TO BE SOLVED BY THE INVENTION

[0014] The present invention has been made to solve the above problems, and an object of the present invention is to provide a pipe connecting device that can more easily and stably connect two pipes, in which the rotary flange does not move in the length direction of the pipe even without a separate stopper, the sealing force between the two pipes can be improved, and the air tightness does not decrease even when repeatedly assembled and disassembled.

[0015] The objects of the present invention are not limited to the above, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

[0016] SOLUTION TO PROBLEM

[0017] A pipe connecting device according to the present invention for achieving the objects as described above includes an adapter consisting of a hollow pipe and a ring-shaped protruding end extending from one end of the length direction of the hollow pipe in the diameter direction of the hollow pipe, a ring-shaped flange formed in a ring shape around the outer circumferential surface of the protruding end and combined in a manner that can rotate around the center axis of the length direction of the hollow pipe but cannot move in the length direction of the hollow pipe, and a fastening unit that crimps the length direction ends of two hollow pipes different from each other by combining two ring-shaped flanges different from each other in a stacked structure.

[0018] One or more seating grooves formed in a circular shape are provided on one face of the protruding end to surround the inside space of the hollow pipe, and an O-ring is seated in the seating groove.

[0019] The face of the protruding end that forms one plane with the length direction end of the hollow pipe is protruded by a predetermined distance from the one face of the ring-shaped flange.

[0020] A sliding groove extending in the circumferential direction of the protruding end is formed on the outer peripheral surface of the protruding end, and a sliding protrusion is formed on the inner side surface of the annular flange, which is inserted into the sliding groove and is slidable in the length direction of the sliding groove.

[0021] The end surface of the sliding protrusion is formed obliquely in a direction intersecting the bottom surface of the sliding groove, so that the end of the sliding protrusion is in line contact with the bottom surface of the sliding groove.

[0022] The inner wall height of the sliding groove on the side close to one end of the hollow pipe is higher than the inner wall height on the side close to the other end of the hollow pipe.

[0023] The inner wall on the side close to one end of the hollow pipe is formed obliquely in the direction close to the one end of the hollow pipe as it gets closer to the bottom surface, and the side surface of the sliding protrusion is formed obliquely in contact with the oblique inner wall of the sliding groove.

[0024] A groove reinforcement plate having superior strength and wear resistance to the protruding end is bonded to the inner wall on the side close to one end of the hollow pipe of the sliding groove, and a protrusion reinforcement plate having superior strength and wear resistance to the sliding protrusion is bonded to the outer side surface on the side corresponding to the groove reinforcement plate of the sliding protrusion.

[0025] A plurality of fastening holes are formed on the annular flange, and the fastening unit includes a fastening bolt inserted into the fastening holes of two annular flanges disposed in a stacked structure, and a fastening nut fixing the fastening bolt to the annular flange.

[0026] The plurality of fastening holes are arranged at equal intervals in the circumferential direction of the annular flange, and between two adjacent fastening holes in one face of the annular flange, either a catch protrusion protruding to a predetermined height or less or a catch groove into which the catch protrusion is inserted is formed, and the catch protrusion and the catch groove are alternately arranged.

[0027] Effects of the Invention

[0028] The pipe connecting device according to the present invention as described above can more easily and stably connect two pipes, and does not require a separate stopper for preventing the rotation flange from moving in the length direction of the pipe, so that the internal structure becomes simple, and has the advantage of being able to significantly improve the air tightness between the two pipes.

[0029] The effects of the present invention are not limited to the above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a use state diagram of the pipe connecting device according to the present application.

[0031] Figure 2 and Figure 3 is an exploded perspective view and a sectional view of the pipe connecting device according to the present application.

[0032] Figure 4 and Figure 5 are a sectional exploded view and a perspective view showing the combined structure of the adapter and the ring flange.

[0033] Figure 6 and Figure 7 are a sectional perspective view and a sectional exploded view of a second embodiment of the pipe connecting device according to the present application.

[0034] Figure 8 is a sectional view of a third embodiment of the pipe connecting device according to the present application.

[0035] Figure 9 is a perspective view of the ring flange included in a fourth embodiment of the pipe connecting device according to the present application.

[0036] (Explanation of Reference Numerals)

[0037] 100: adapter 110: hollow pipe

[0038] 120: protruding end 122: sliding groove

[0039] 124: seating groove 126: groove reinforcement plate

[0040] 200: ring flange 210: fastening hole

[0041] 220: sliding protrusion 222: protrusion reinforcement plate

[0042] 230: catch protrusion 240: catch groove

[0043] 300: fastening unit 310: fastening bolt

[0044] 320: fastening nut 400: O-ring DETAILED DESCRIPTION

[0045] Hereinafter, embodiments of the present application will be explained in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present application. The present application can be realized in various different ways, and is not limited to the embodiments explained here.

[0046] In explaining the present application, the size or shape, etc. of the constituent elements shown in the drawings can be exaggerated or simplified for the sake of clarity and ease of explanation.

[0047] Also, the specifically defined terms can vary according to the intention or custom of the user, operator, etc. in consideration of the structure and operation of the present application. These terms should be interpreted based on the meaning and concept conforming to the technical idea of the present application, based on the contents of the entire specification.

[0048] For the sake of clearly explaining the present application, the description of the parts irrelevant to the technical idea of the present application is omitted, and the same reference numerals will be assigned to the same or similar constituent elements throughout the specification.

[0049] Also, in each embodiment, the same reference numerals will be used to describe the constituent elements having the same structure only in the representative embodiment, and only the structure different from the representative embodiment will be described in other embodiments.

[0050] Throughout the specification, when it is recited that one part is "connected" to another part, this includes not only the case of "direct connection" but also the case of "indirect connection" with other parts interposed therebetween. Also, when it is recited that one part "includes" a certain constituent element, this means that other constituent elements are further included, rather than excluding other constituent elements, unless explicitly recited to the contrary.

[0051] Figure 1 is a use state diagram of a pipe connecting device according to the present application, Figure 2 and Figure 3 is an exploded perspective view and a sectional view of a pipe connecting device according to the present application, Figure 4 and Figure 5 is a sectional exploded view and a perspective view showing the combined structure of an adapter and a ring-shaped flange.

[0052] The pipe connecting device according to the present application is a device for tightly combining two pipes different from each other in a flange connection manner, including: an adapter 100 composed of a hollow pipe 110 and a protruding end 120; a ring-shaped flange 200 combined to the adapter 100 in a self-rotating structure; and a fastening unit 300 that tightly connects two hollow pipes 110 by combining two ring-shaped flanges 200 different from each other in a stacked structure, i.e., in a butt joint manner. The protruding end 120 is formed in a manner extending from one end of the length direction of the hollow pipe 110 in the diameter direction of the hollow pipe 110, the ring-shaped flange 200 surrounds the outer peripheral surface of the protruding end, and is installed in a manner that can self-rotate around the center axis of the length direction of the hollow pipe 110, but cannot move in the length direction of the hollow pipe 110.

[0053] After the user combines a pipe (not shown) to the other side of the hollow pipe 110 (more specifically, the opposite side of the position where the ring-shaped flange 200 is located), as shown inFigure 1 As shown, two pipes can be connected by coupling the flanges included in the pipe connecting devices different from each other in a stacked manner.

[0054] On the other hand, a plurality of fastening holes 210 are formed on the annular flange 200 for fastening the fastening unit 300, which includes a fastening bolt 310 inserted into the fastening hole 210 and a fastening nut 320 fixing the fastening bolt 310 to the annular flange 200. Thus, as shown, Figure 1 As shown, in order to insert the fastening bolt 310 into two annular flanges 200 configured in a stacked structure, the annular flange 200 is rotated so that the fastening holes 210 formed on each annular flange 200 are aligned. At this time, when the annular flange 200 is fixedly coupled to the adapter 100, if the positions of the fastening holes 210 formed on the annular flange 200 are to be adjusted, the pipe connecting device according to the present application needs to be rotated as a whole, and thus there is a problem in that the adjustment of the positions of the fastening holes 210 becomes very difficult. In particular, when the pipes are already coupled to the other side of the hollow pipe 110, the operation of rotating the pipe connecting device according to the present application becomes almost impossible.

[0055] However, the annular flange 200 according to the present application is not fixedly coupled to the adapter 100 but is coupled to the protruding end 120 of the adapter 100 in a structure capable of self-rotation, and thus the operator can easily align the fastening holes 210 formed on two annular flanges 200 while rotating the annular flanges 200, and by inserting the fastening bolt 310 and assembling the fastening nut 320, the two annular flanges 200 can be coupled in a stacked structure. As described above, when the two annular flanges 200 are coupled in a stacked structure, one end of the length direction of the two hollow pipes 110 different from each other on which each annular flange 200 is mounted is crimped, and accordingly the pipes coupled to the other ends of the hollow pipes 110 are integrally connected through the hollow pipes 110.

[0056] In addition, when the two annular flanges 200 are coupled in a stacked structure, the protruding ends 120 provided at each hollow pipe 110 are also closely adhered in a stacked structure, and more than one O-ring 400 is provided between the two protruding ends 120 so as to be capable of preventing the phenomenon of leakage of fluid flowing inside the hollow pipe 110 from between the two protruding ends 120. At this time, one side of the protruding end 120 is provided with more than one seating groove 124 formed in a circular shape in a manner of surrounding the inside space of the hollow pipe 110 so that the O-ring 400 can be accurately fixed at a predetermined position, and the O-ring 400 is seated in the seating groove 124.

[0057] On the other hand, when the annular flange 200 is installed in a manner surrounding the protruding end 120, if one side of the annular flange 200 (more specifically, a side in the protruding end which forms a plane with one end of the length direction of the hollow pipe 110) forms a plane with one end of the length direction of the protruding end 120, as shown in Figure 3 When the two annular flanges 200 are combined in a stacked structure, one side of the two protruding ends 120 installed on each of the annular flanges 200 also comes into close contact with each other. However, when the thickness of the annular flange 200 is manufactured to be slightly thicker than the design value or the protruding end 120 is manufactured to be slightly thinner than the design value, even if the two annular flanges 200 are combined in a manner being crimped, a situation in which the two protruding ends 120 cannot come into close contact can occur.

[0058] Therefore, preferably, one side of the protruding end protrudes from one side of the annular flange 200 by a predetermined distance. As described above, when the protruding end is configured in a manner protruding slightly more than the annular flange 200, even if the thickness of the annular flange 200 is manufactured to be slightly thicker than the design value or the protruding end 120 is manufactured to be slightly thinner than the design value, when the two annular flanges 200 are fastened in a stacked structure, the two protruding ends can be strongly crimped.

[0059] On the other hand, a sliding groove 122 extending in the circumferential direction of the protruding end 120 is formed on the outer circumferential surface of the protruding end 120, so that the annular flange 200 can only rotate around the central axis of the length direction of the hollow pipe 110, but cannot move in the length direction of the hollow pipe 110. A sliding protrusion 220 is formed on the inner side surface of the annular flange 200, and the sliding protrusion 220 is inserted into the sliding groove 122 and can slide in the length direction of the sliding groove 122.

[0060] As described above, when the sliding protrusion 220 of the annular flange 200 is inserted into the sliding groove 122 of the protruding end 120, unless the sliding protrusion 220 is broken, the annular flange 200 does not fall off from the adapter 100. Therefore, when an operator who performs a pipe connection construction according to the present application wants to connect two pipes, an operation of separately carrying the adapter 100 and the annular flange 200 or inserting the annular flange 200 into the adapter 100 is not required, and thus has an advantage that the pipe connection construction can be more quickly and easily completed.

[0061] At this time, when the end surface of the sliding protrusion 220 is formed in surface contact with the bottom surface of the sliding groove 122, a large frictional force is generated when the annular flange 200 is rotated, and thus a large force can be required to rotate the annular flange 200 while aligning the fastening holes 210. In particular, when the annular flange 200 is manufactured in a large size by a heavy metal, the operation of rotating the annular flange 200 can be difficult.

[0062] To solve the above-described problems, in the pipe connecting device according to the present application, preferably, the end surface of the sliding protrusion 220 is formed obliquely in a direction intersecting the bottom surface of the sliding groove 122. As shown in Figure 4 When the end surface of the sliding protrusion 220 is formed obliquely, the end of the sliding protrusion 220 is in line contact with the bottom surface of the sliding groove 122, rather than in surface contact, and thus the frictional force between the sliding protrusion 220 and the sliding groove 122 can be significantly reduced, so that the operator can more easily rotate the annular flange 200.

[0063] Further, as shown in Figure 3 When the fastening nut 320 is tightened so that the two annular flanges 200 are combined in a stacked structure, the sliding protrusion 220 is pressed against the inner wall of one side of the sliding groove 122 (more specifically, the inner wall near the one end side of the hollow pipe 110) by the fastening force between the fastening bolt 310 and the fastening nut 320, so that the two protruding ends 120 facing each other are crimped.

[0064] At this time, when the fastening force for tightening the fastening bolt 310 is applied with a strong force so that the sliding protrusion 220 is pressed against the inner wall of the sliding groove 122 with a strong force, the contact surface between the outer side surface of the sliding protrusion 220 and the inner wall of the sliding groove 122 can be deformed or damaged. As shown above, when the sliding protrusion 220 or the sliding groove 122 is deformed or damaged, even if the two annular flanges 200 stacked are crimped, the two protruding ends 120 can not be firmly crimped. In particular, when the adapter 100 and the annular flange 200 are made of synthetic resin in order to thermally bond synthetic resin materials, the risk of deformation or damage of the sliding protrusion 220 or the sliding groove 122 becomes greater.

[0065] Therefore, in the pipe connecting device according to the present application, in order to be able to prevent deformation or damage of the sliding protrusion 220 or the sliding groove 122, preferably, as shown in Figure 4 The inner wall of the sliding groove 122 near the one end side of the hollow pipe 110 ( Figure 4The inner wall of the sliding groove 122 (left side in the figure) is provided with a groove reinforcement plate 126 having superior strength and wear resistance to the protruding end 120, and the outer side of the sliding protrusion 220 corresponding to the groove reinforcement plate 126 is provided with a protrusion reinforcement plate 222 having superior strength and wear resistance to the sliding protrusion 220. Figure 4 The inner wall of the sliding groove 122 (left side in the figure) is provided with a groove reinforcement plate 126 having superior strength and wear resistance to the protruding end 120, and the outer side of the sliding protrusion 220 corresponding to the groove reinforcement plate 126 is provided with a protrusion reinforcement plate 222 having superior strength and wear resistance to the sliding protrusion 220.

[0066] As described above, when the sliding groove 122 and the sliding protrusion 220 are provided with the groove reinforcement plate 126 and the protrusion reinforcement plate 222, even if the adapter 100 and the annular flange 200 are made of synthetic resin, the risk of deformation or damage of the sliding protrusion 220 or the sliding groove 122 can be significantly reduced. At this time, the groove reinforcement plate 126 and the protrusion reinforcement plate 222 can be made of any type of material as long as it has a strength that will not be deformed or damaged by the fastening force of the fastening unit 300.

[0067] Figure 6 and Figure 7 is a cross-sectional perspective view and a cross-sectional exploded view of a pipe connecting device according to a second embodiment of the present application.

[0068] In the pipe connecting device according to the present application, the fastening force of the fastening unit 300 is transmitted to one side of the sliding groove 122 through the sliding protrusion 220, and when the contact area of the sliding protrusion 220 and the sliding groove 122 is set to be narrow, the fastening force of the fastening unit 300 is concentrated in a local point, and thus the risk of deformation or damage of the sliding protrusion 220 and the sliding groove 122 can increase.

[0069] Therefore, in the pipe connecting device according to the present application, in order to enable the fastening force of the fastening unit 300 to be transmitted to the protruding end 120 through a larger area, as Figure 6 and Figure 7 As shown in the drawings, it is preferable that the inner wall height of the sliding groove 122 near one end side of the hollow pipe 110 be formed higher than the inner wall height near the other end side of the hollow pipe 110.

[0070] As described above, when the inner wall height of one side of the sliding groove 122 is formed to be high, the contact area of the sliding protrusion 220 and the sliding groove 122 can be ensured to be wide, thereby having the advantage that the risk of deformation or damage of the sliding protrusion 220 and the sliding groove 122 is significantly reduced.

[0071] Figure 8 is a cross-sectional view of a pipe connecting device according to a third embodiment of the present application.

[0072] The annular flange 200 is capable of self-rotation in a state where it is installed in a manner surrounding the protruding end 120, and at this time, when it is configured in a manner where the inner circumferential surface of the annular flange 200 is in close contact with the outer circumferential surface of the protruding end 120, i.e. when a large frictional force is generated between the annular flange 200 and the protruding end 120, a large force is required to rotate the annular flange 200.

[0073] Therefore, preferably, in the pipe connecting device according to the present application, the inner diameter of the annular flange 200 is manufactured to be slightly larger than the inner diameter of the protruding end 120, and in this case, there is a risk that foreign matter flows into the gap between the inner diameter of the annular flange 200 and the outer diameter of the protruding end 120.

[0074] If earth or other foreign matter flows into the gap between the inner diameter of the annular flange 200 and the outer diameter of the protruding end 120, when the fastening unit 300 is loosened and the annular flange 200 is rotated in order to readjust the annular flange 200, there is a risk that the annular flange 200 cannot be smoothly rotated.

[0075] Therefore, before the fastening unit 300 is fastened, the annular flange 200 can be spaced apart from the outer circumferential surface of the protruding end 120, and when the fastening unit 300 is fastened, the annular flange 200 can be in close contact with the outer circumferential surface of the protruding end 120. That is, the inner wall of the sliding groove 122, which is closer to the one end side of the hollow pipe 110, is formed to be more inclined toward the one end of the hollow pipe 110 as it is closer to the bottom surface, and one side surface of the sliding protrusion 220 can be formed to be inclined in a manner to be in contact with the inclined inner wall of the sliding groove 122.

[0076] As described above with reference to the above Figure 5 explanation, in the pipe connecting device according to the present application, one side of the protruding end is slightly convex than one side of the annular flange 200, and thus when two protruding ends 120, which are different from each other, are disposed in a manner to be in contact with each other, the annular flanges 200 installed on the respective protruding ends 120 become in a state where they are spaced apart by a certain distance.

[0077] In the above-described state, when the fastening unit 300 is fastened, the two annular flanges 200 are pulled to be close to each other, and at this time, as shown in the present embodiment, when one side outer surface of the sliding protrusion and one side inner wall of the sliding groove 122 are formed to be inclined, as Figure 8 indicated, the annular flange 200 is pulled to the front (left side in Figure 8 ) and is in close contact with the outer circumferential surface of the protruding end 120. At this time, when the annular flange 200 is made of synthetic resin having a certain degree of ductility, the effect that the annular flange 200 is in close contact with the protruding end 120 is further improved.

[0078] As described above, when the inner circumferential surface of the annular flange 200 is in close contact with the outer circumferential surface of the protruding end 120, there is no risk of soil or foreign matter flowing between the annular flange 200 and the protruding end 120, and thus the maintenance work such as disassembly and reassembly of the annular flange 200 becomes easy. In addition, if foreign matter does not flow between the annular flange 200 and the protruding end 120, the risk of damage to the annular flange 200 and the protruding end 120 is also reduced.

[0079] Figure 9 is a perspective view of an annular flange included in a fourth embodiment of the pipe connecting device according to the present application.

[0080] When connecting two pipes using the pipe connecting device according to the present application, it is necessary to adjust the self-rotation angle of the annular flange 200 so that the fastening holes 210 formed on each of the two annular flanges 200 are aligned. However, when the annular flange 200 is arranged to be buried in the ground, there is a problem in that it is difficult for the operator to confirm the position of the fastening hole 210 with the naked eye.

[0081] In order to solve the problem as described above, the pipe connecting device according to the present application is configured in such a manner that the operator can align the fastening holes 210 without confirming the position of the fastening hole 210 with the naked eye.

[0082] For example, the plurality of fastening holes 210 are arranged at equal intervals in the circumferential direction of the annular flange 200, and a snap protrusion and a snap recess 240 can be alternately formed between two adjacent fastening holes 210 in one face of the annular flange 200. Since the snap protrusion and the snap recess 240 are accurately positioned in the middle of the two adjacent fastening holes 210, when the snap protrusion is seated in the snap recess 240, the fastening holes 210 formed on each of the annular flanges 200 are aligned.

[0083] At this time, the snap protrusion is slightly protruded to a height below a predetermined height, and the snap recess 240 is formed so that the snap protrusion can be inserted therein, and when the operator self-rotates any one of the annular flanges 200 in a state in which the two annular flanges 200 are stacked with one face in contact, a snap feeling occurs when the snap protrusion 230 is seated in the snap recess 240. Thus, the operator can recognize that the fastening holes 210 of the two annular flanges 200 are aligned by feeling this snap feeling, and thus can easily fasten the fastening unit 300.

[0084] At this time, the protrusion height of the snap protrusion 230 can be appropriately selected according to various conditions such as the size and material of the annular flange 200.

[0085] While the application has been shown and described with reference to the preferred embodiments thereof, it will be apparent to those skilled in the art that many changes and modifications can be made therein without departing from the spirit and scope of the application as defined in the following claims.

Claims

1. A pipe connecting device characterized by comprising: an adapter composed of a hollow pipe and a ring-shaped protruding end extending from one end of the length of the hollow pipe in the diameter direction of the hollow pipe; a ring-shaped flange formed in a ring shape around the outer circumferential surface of the protruding end and combined in a manner that it can rotate around the central axis of the length of the hollow pipe but cannot move in the length direction of the hollow pipe; and a fastening unit that crimps the lengthwise ends of two hollow pipes that are different from each other by combining two ring-shaped flanges that are different from each other in a stacked structure.

2. The pipe connecting device according to claim 1, characterized in that: one or more seating grooves formed in a circular shape are provided on one face of the protruding end to surround the inside space of the hollow pipe, an O-ring is seated in the seating groove.

3. The pipe connecting device according to claim 1, characterized in that: the face of the protruding end that forms a plane with the lengthwise end of the hollow pipe is projected by a predetermined distance from one face of the ring-shaped flange.

4. The pipe connecting device according to claim 1, characterized in that: a sliding groove extending in the circumferential direction of the protruding end is formed on the outer circumferential surface of the protruding end, a sliding protrusion that is inserted into the sliding groove and can slide in the length direction of the sliding groove is formed on the inner side face of the ring-shaped flange.

5. The pipe connecting device according to claim 4, characterized in that: the end face of the sliding protrusion is formed obliquely in a direction that intersects the bottom face of the sliding groove, so that the end of the sliding protrusion is in line contact with the bottom face of the sliding groove.

6. The pipe connecting device according to claim 4, characterized in that: the inner wall height of the sliding groove on the side closer to one end of the hollow pipe is formed higher than the inner wall height on the side closer to the other end of the hollow pipe.

7. The pipe connecting device according to claim 4, characterized in that: the inner wall on the side closer to one end of the hollow pipe in the inner wall of the sliding groove is formed obliquely in the direction closer to one end of the hollow pipe as it gets closer to the bottom face, one side face of the sliding protrusion is formed obliquely in a manner that it is in contact with the oblique inner wall of the sliding groove.

8. The pipe connecting device according to claim 4, characterized in that: a groove reinforcement plate having superior strength and wear resistance to the protruding end is combined on the inner wall on the side closer to one end of the hollow pipe in the inner wall of the sliding groove, a protrusion reinforcement plate having superior strength and wear resistance to the sliding protrusion is combined on the side corresponding to the groove reinforcement plate in the outer side face of the sliding protrusion.

9. The pipe connecting device according to claim 1, characterized in that: a plurality of fastening holes are formed in the ring-shaped flange, the fastening unit includes: a fastening bolt that is inserted into the fastening holes of the two ring-shaped flanges seated in a stacked structure; and a fastening nut that fixes the fastening bolt to the ring-shaped flange.

10. The pipe connecting device according to claim 9, characterized in that: ​ The plurality of fastening holes are arranged at equal intervals in the circumferential direction of the annular flange, Between any one of the snap protrusions protruding to a height below the predetermined height and the snap recess into which the snap protrusion is inserted, formed between two fastening holes adjacent to each other in one side of the annular flange, The snap protrusions and the snap recesses are arranged alternately.

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