KR20200140144A - Methods for coupling pipes - Google Patents

Abstract

The pipe connection method according to the present invention is characterized in that an effective watertight connection is possible with a simple configuration, there is no reduction in the cross-sectional area of the flow path of the pipe connection part, and is particularly suitable for connection of a composite pipe.

Description

How to connect pipes{Methods for coupling pipes}

The present invention relates to a pipe connection method, and more specifically, an effective watertight connection with a simple configuration and no reduction in the flow path cross-sectional area of the pipe connection portion, particularly to a pipe connection method suitable for connection of a composite pipe.

In general, metal pipes with high corrosion resistance, such as stainless steel pipes, have many advantages, but because expensive materials such as stainless steel must be used, the manufacturing cost is high and there are limitations in forming such as bending. It can only be manufactured.

In addition, a metal pipe manufactured as a straight pipe is cut to a predetermined length for transportation, etc., but there is a problem that a lot of parts, labor, and work time are required to connect the metal pipes to each other during field construction. In addition, there is a problem in that the metal pipe is not free from corrosion by soil and electrical corrosion when buried in the ground.

On the other hand, the resin pipe has excellent corrosion resistance, light weight, good workability, and low price, but there is a problem in that the connection part is separated by contraction and expansion according to temperature changes, causing leakage and weak pressure.

The present applicant has developed a metal resin composite pipe that can solve the above problems and has been registered as Korean Patent No. 1166886. 1A to 1B, the metal resin composite tube 1 is a tube formed by sequentially forming an adhesive layer 4 and a resin layer 3 on the outer surface of the thin stainless steel tube 2.

The thin stainless steel pipe 2 is a portion that is in direct contact with the fluid flowing inside the pipe, and has excellent corrosion resistance. The resin layer 3 covers the thin stainless steel tube 2 with a thickness much thicker than that of the thin stainless steel tube 2, and is made of a resin, for example polyethylene, which has excellent corrosion resistance and low cost. Therefore, the composite pipe 1 has the advantage of excellent corrosion resistance to fluid flowing through the pipe, excellent corrosion resistance to soil, and low cost.

In addition, the composite pipe 1 can be wound in an annular shape after being manufactured as a straight pipe, and the composite pipe 1 wound in an annular shape can be reduced to a straight pipe, and has the advantage that there is no cross-sectional damage during this process. Therefore, after manufacturing it in a long length at the factory, it is rolled in an annular shape and transported to the construction site, and the annular wound composite pipe 1 is reduced to a straight pipe at the construction site for construction. As such, the composite pipe 1 has many advantages compared to other conventional pipes.

On the other hand, a device for connecting another conventional composite pipe is disclosed in Korean Utility Model Registration Nos. 159414 and 164003. However, the connection device disclosed in the document has a problem in that the structure is complicated and durability is poor, and the cross-sectional area of the flow path in the pipe connection portion is reduced.

The present invention has been proposed to solve the above problems, and an object of the present invention is to provide an effective watertight connection with a simple configuration, no reduction in flow path cross-sectional area of a pipe connection, and a connection method particularly suitable for connection of a composite pipe.

In order to achieve the above object, a pipe connection method according to a preferred embodiment of the present invention includes the steps of: (a) inserting the ends of both pipes between the sleeve 110 and the joint 130, respectively; And, (b) after the step (a), compressing the joint 130 to combine the end of the tube with the joint 130 and the sleeve 110.

The O-ring 132 and the metal ring 131 are installed on the inner circumferential surface of the end of the joint 130, and the O-ring 132 and the metal ring 131 are attached to the outer circumferential surface of the tube by the compression in step (b). It is tight.

Prior to the step (a), it may further include expanding the ends of both pipes, respectively. And, the step (a) inserts the end of the expanded pipe between the sleeve 110 and the joint 130, respectively.

According to an embodiment of the present invention, the joint 130 is installed at both ends of the sleeve 110, respectively, the O-ring 132 and the metal ring 131 are installed at the front end of the joint 130, and the joint ( The rear end of 130) may be coupled to the outer peripheral surface of the sleeve 110. In this case, since the rear end of the joint 130 is coupled to the outer circumferential surface of the sleeve 110, the insertion length of the tube in the step (a) is limited.

According to another embodiment of the present invention, one joint 130 is installed on the outer circumferential surface of the sleeve 110, but the sleeve 110 is inserted into the joint 130, and the central portion of the joint 130 has a groove ( 137) is formed continuously in the circumferential direction. The groove 137 is coupled to the outer peripheral surface of the sleeve 110. And, by the groove 137 is coupled to the outer peripheral surface of the sleeve 110, the insertion length of the tube in the step (a) is limited.

According to another embodiment of the present invention, one joint 130 is installed on the outer circumferential surface of the sleeve 110, but the sleeve 110 is inserted into the joint 130 and a protrusion ( 117) is formed continuously in the circumferential direction. The protrusion 117 is coupled to the inner circumferential surface of the joint 130. In addition, the protrusion 117 is coupled to the inner circumferential surface of the joint 130 to limit the insertion length of the tube in the step (a).

On the inner surface of the metal ring 131, teeth 131a are formed in the circumferential direction, and the teeth 131a may be fixed by pressing into the outer peripheral surface of the tube, for example, the resin layer 3.

The front end of the joint 130 may include a first seating portion 133 and a second seating portion 134. The first seating portion 133 is continuously formed in the circumferential direction so that the metal ring 131 is seated, and the second seating portion 134 is continuously formed in the circumferential direction so that the O-ring 132 is seated, but the first seating portion It is formed adjacent to 133. The first and second seating portions 133 and 134 are moved toward the sleeve 110 by the compression, so that the metal ring 131 may be pressed into the outer peripheral surface of the tube.

A jaw 135 is formed between the first and second seating portions 133 and 134, and accordingly, the first seating portion 133 protrudes further outward than the second seating portion 134, and is removed by the compression. The first and second seating portions 133 and 134 are positioned on the same plane, and the jaws 135 are removed.

According to another embodiment of the present invention, the central portion of the sleeve 110 is made of a corrugated pipe 119, so that the sleeve 110 is free to bend. In this case, the joint 130 is respectively installed at both ends of the sleeve 110, the rear end of the joint 130 is coupled to the outer circumferential surface of the sleeve 110, and the combined portion is that both pipes are connected to the sleeve 110 When inserted between the joints 130, it acts as a stopper.

At both ends of the sleeve 110, two first protruding lines 112 are continuously formed in a circumferential direction so as to be spaced apart by a predetermined distance, and a first groove line 111 is formed between the two first protruding lines 112. It is formed continuously in the circumferential direction, and an O-ring 113 for watertightness is installed in the first groove line 111.

The O-ring 113 may be positioned at an end side of the sleeve 110 rather than the metal ring 131, positioned at a center side of the sleeve 110, or positioned at a location corresponding to the metal ring 131.

On the other hand, the second groove line 114 is formed in the circumferential direction at the center of the sleeve 110 than the first groove line 111, and the second protruding lines 115 are at both sides of the second groove line 114. It is formed in the circumferential direction, and an O-ring 116 may be installed in the second groove line 114. The relative positions of the joint 130 and the sleeve 110 may be determined so that the metal ring 131 compresses between the first and second home lines 111 and 114.

It is preferable that the pipe is a composite pipe. The composite pipe, a thin plate stainless steel metal pipe (2); An adhesive layer 4 formed on the outer peripheral surface of the thin stainless steel metal tube 2; And, the resin layer 3 formed on the outer peripheral surface of the adhesive layer 4; may include.

And, it is preferable that the sleeve 110, the joint 130, and the metal ring 131 are made of stainless steel.

The pipe connection method according to the present invention has the advantage that effective watertight connection is possible with a simple configuration, there is no reduction in the flow path cross-sectional area of the pipe connection part, and is particularly suitable for connection of a composite pipe.

1A is a perspective view showing a composite tube developed by the present applicant.
Figure 1b is a view showing an enlarged cross-section of the composite pipe of Figure 1a.
Figure 2a is an exploded perspective view showing a pipe connecting device according to a first embodiment of the present invention and a pipe whose end is enlarged.
Figure 2b is a cross-sectional view showing the pipe connection device of Figure 2a.
Figure 2c is a cross-sectional view showing the pipe connection device of Figure 2a connecting both pipes expanded.
Figure 3a is a cross-sectional view showing a modified example of the pipe connection device of Figure 2a.
Figure 3b is a cross-sectional view showing the pipe connection device of Figure 3a connecting both pipes expanded.
Figure 4a is a cross-sectional view showing another modified example of the pipe connection device of Figure 2a.
Figure 4b is a cross-sectional view showing the pipe connecting device of Figure 4a connecting both pipes expanded.
Figure 5a is a cross-sectional view showing another modified example of the pipe connection device of Figure 2a.
Figure 5b is a cross-sectional view showing the pipe connecting device of Figure 5a connecting both pipes expanded.
Figure 6a is a cross-sectional view showing another modified example of the pipe connection device of Figure 2a.
Figure 6b is a cross-sectional view showing the pipe connecting device of Figure 6a connecting both pipes expanded.
Figure 7a is a cross-sectional view showing a pipe connecting device according to a second embodiment of the present invention.
Figure 7b is a cross-sectional view showing the pipe connection device of Figure 7a connecting both pipes expanded.
Figure 8a is a cross-sectional view showing a modified example of the pipe connection device of Figure 7a.
Figure 8b is a cross-sectional view showing the pipe connection device of Figure 8a connecting both pipes expanded.
Figure 9a is a cross-sectional view showing another modified example of the pipe connection device of Figure 7a.
Figure 9b is a cross-sectional view showing the pipe connection device of Figure 9a connecting both pipes expanded.
Figure 10a is a cross-sectional view showing another modified example of the pipe connection device of Figure 7a.
Figure 10b is a cross-sectional view showing the pipe connection device of Figure 10a connecting both pipes expanded.
Figure 11a is a cross-sectional view showing another modified example of the pipe connection device of Figure 7a.
Figure 11b is a cross-sectional view showing the pipe connection device of Figure 11a connecting both pipes expanded.
12A is a cross-sectional view showing a pipe connecting device according to a third embodiment of the present invention.
Figure 12b is a cross-sectional view showing the pipe connection device of Figure 12a connecting both pipes expanded.
Figure 13a is a cross-sectional view showing a modified example of the pipe connection device of Figure 12a.
13B is a cross-sectional view showing the pipe connecting device of FIG. 13A connecting both pipes expanded.
14A is a cross-sectional view showing another modified example of the pipe connection device of FIG. 12A.
14B is a cross-sectional view showing the pipe connecting device of FIG. 14A connecting both pipes expanded.
Figure 15a is a cross-sectional view showing another modified example of the pipe connection device of Figure 12a.
Figure 15b is a cross-sectional view showing the pipe connection device of Figure 15a connecting both pipes expanded.
Figure 16a is a cross-sectional view showing another modified example of the pipe connection device of Figure 12a.
Figure 16b is a cross-sectional view showing the pipe connecting device of Figure 16a connecting both pipes expanded.
17A is a cross-sectional view showing a pipe connecting device according to a fourth embodiment of the present invention.
Figure 17b is a cross-sectional view showing the pipe connecting device of Figure 17a connecting both pipes expanded.
18A is a cross-sectional view showing a modified example of the pipe connecting device of FIG. 17A.
Figure 18b is a cross-sectional view showing the pipe connection device of Figure 18a connecting both pipes expanded.
19A is a cross-sectional view showing another modified example of the pipe connecting device of FIG. 17A.
19B is a cross-sectional view showing the pipe connecting device of FIG. 19A connecting both pipes expanded.
Figure 20a is a cross-sectional view showing another modified example of the pipe connection device of Figure 17a.
Figure 20b is a cross-sectional view showing the pipe connection device of Figure 20a connecting both pipes expanded.
Figure 21a is a cross-sectional view showing another modified example of the pipe connection device of Figure 17a.
Figure 21b is a cross-sectional view showing the pipe connecting device of Figure 21a connecting both pipes expanded.
22A is a perspective view showing a pipe connecting device according to a fifth embodiment of the present invention.
Figure 22b is a cross-sectional view showing the pipe connecting device of Figure 22a connecting both pipes.
23A is a perspective view showing a pipe connecting device according to a sixth embodiment of the present invention.
23B is a cross-sectional view showing that the pipe connecting device of FIG. 23A connects both pipes.
24A is a perspective view showing a pipe connecting device according to a seventh embodiment of the present invention.
Fig. 24b is a cross-sectional view showing the pipe connecting device of Fig. 24a connecting both pipes;
25A is a perspective view showing a pipe connecting device according to an eighth embodiment of the present invention.
Figure 25b is a cross-sectional view showing the pipe connecting device of Figure 25a connecting both pipes.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only examples of the present invention, and do not represent all the technical spirit of the present invention, and various equivalents that can replace them at the time of application And it should be understood that there may be variations.

As described above, the present invention was developed to connect the composite pipe of Korean Patent No. 1166886, but may be used for other pipes. Therefore, the scope of the present invention should not be construed as being limited only to the compound tube. However, in the following, for convenience of explanation, what is applied to the composite pipe will be described as an example. In addition, the contents described in the Korean Patent No. 1166886 are all included in this specification.

As described in [Technology behind the Invention], the composite tube 1 is a tube formed by sequentially forming an adhesive layer 4 and a resin layer 3 on the outer surface of the thin stainless steel tube 2, It has the characteristic that the diameter can be increased by this. The present applicant discovered these characteristics of the composite pipe 1 and devised the present invention based on this.

Meanwhile, in each of the drawings below, the same reference numerals denote the same elements.

[First embodiment]

2A is an exploded perspective view showing a pipe connecting device and a pipe whose ends are enlarged according to a first embodiment of the present invention. In addition, FIG. 2B is a cross-sectional view showing the pipe connecting device, and FIG. 2C is a cross-sectional view showing the pipe connecting device connecting both pipes.

As shown in the figure, the pipe connection device 100 includes a sleeve 110 and a joint 130.

The sleeve 110 has a tubular shape. Both ends of the sleeve 110 are inserted into the inside of the expanded composite pipe 1 to be connected. The sleeve 110 is inserted into the inside of the expanded composite pipe 1, and has an outer diameter that is firmly in close contact with the composite pipe 1 when the joint 130 is compressed.

Sleeve 110 may be made of metal, preferably stainless steel. And, the sleeve 110 may be deformed for a solid coupling of the sleeve 110 and the joint 130 and the expanded composite pipe 1 when pressed.

Since the sleeve 110 has a central portion of the corrugated pipe 119, bending is free, and thus, both composite pipes 1 can be connected even when both composite pipes 1 are positioned so as to be offset or formed at a predetermined angle.

The joint 130 is installed outside the sleeve 110. Specifically, the joint 130 is a tubular member, and the sleeve 110 is inserted into the joint 130 and the rear end of the joint 130 is coupled to the outer peripheral surface of the sleeve 110. Then, the expanded composite pipe 1 is inserted between the joint 130 and the sleeve 110. At this time, the configuration in which the rear end of the joint 130 is coupled to the outer circumferential surface of the sleeve 11 is a stopper that limits the insertion length of the composite pipe 1 when the composite pipe 1 is inserted between the joint 130 and the sleeve 110 Plays a role. The rear end of the joint 130 may be coupled to the outer peripheral surface of the sleeve 11 by welding or the like.

The joint 130 may be made of metal, and is preferably made of stainless steel.

An O-ring 132 and a metal ring 131 are installed on the inner circumferential surface of the end (tip) of the joint 130 in the circumferential direction. The O-ring 132 is for watertight between the joint 130 and the composite pipe 1, and the metal ring 131 is for fixing the joint 130 to the composite pipe 1.

Preferably, the first and second seating portions 133, 134 are continuously formed in the circumferential direction at the front end of the joint 130, and a metal ring 131 is installed in the first seating portion 133, and a second seating portion The O-ring 132 is installed at 134.

On the inner surface of the metal ring 131, teeth 131a are formed in the circumferential direction, and during compression, the teeth 131a are pressed into the outer peripheral surface (resin layer) of the composite pipe 1 and fixed. Accordingly, it is possible to prevent the composite pipe 1 from being separated even when a high pressure acts inside the composite pipe 1 or a pulling force acts on the composite pipe 1. To this end, the teeth (131a) is made of a vertical surface and an inclined surface, the vertical surface is preferably formed toward the center of the sleeve 110 and the inclined surface toward the end of the sleeve (110).

In order to effectively press-fit the tooth portion 131a into the outer circumferential surface (resin layer) of the composite pipe 1, a jaw 135 is formed between the first and second seating portions 133 and 134, and thus the first seating portion (133) is more protruding outward than the second seating portion 134, but the first and second seating portions 133, 134 are located on the same plane by the compression, and the jaw 135 is removed. The tooth portion 131a may be pressed into the outer peripheral surface (resin layer) more deeply.

Then, a method of connecting both composite pipes 1 using the pipe connecting device 100 will be described.

First, the end of the composite pipe 1 is expanded, but it is expanded to have a diameter that can be inserted between the sleeve 110 and the joint 130. The expansion may be made by a conventional expansion method.

As described in [Technology behind the Invention], the composite tube 1 is a tube formed by sequentially forming an adhesive layer 4 and a resin layer 3 on the outer surface of the thin stainless steel tube 2, It has the characteristic that the diameter can be increased by this. The present applicant discovered these characteristics of the composite pipe 1 and devised the present invention based on this.

Subsequently, the end of the expanded composite pipe 1 is inserted between the sleeve 110 and the joint 130, and the tip of the joint 130 is compressed.

Due to the compression, the teeth 131a are pressed into and fixed to the outer surface (resin layer) of the composite pipe 1, and thus, even if a tensile force acts on the composite pipe 1 and the sleeve 110, they are not separated. In addition, since the end of the composite pipe 1 is expanded and the sleeve 110 is inserted into the expanded end, the cross-sectional area of the flow path of the composite pipe 1 in the pipe connection portion is not reduced.

Meanwhile, FIG. 3A is a cross-sectional view showing a modified example of the pipe connecting device, and FIG. 3B is a cross-sectional view illustrating that the pipe connecting device connects both expanded pipes.

The pipe connection device 100a is formed continuously in the circumferential direction so that the two first protruding lines 112 are spaced apart a predetermined distance at both ends of the sleeve 110, compared to the aforementioned pipe connection device 100, and One groove line 111 is continuously formed between the two first protruding lines 112 in the circumferential direction, and the O-ring 113 is different in that it is installed on the first groove line 111 for watertightness. The O-ring 113 is located at the center of the sleeve 110 slightly than the metal ring 131.

The relative positions of the O-ring 113 and the metal ring 131 may be changed. For example, as shown in FIGS. 4A to 4B, the metal ring 131 and the O-ring 113 are positioned to correspond to each other (that is, the metal ring 131 is installed at a position where the O-ring 113 is pressed), As shown in FIGS. 5A to 5B, the O-ring 113 may be located at the end of the sleeve 110 rather than the metal ring 131.

6A is a cross-sectional view showing another modified example of the pipe connecting device, and FIG. 6B is a cross-sectional view illustrating that the pipe connecting device connects both expanded pipes.

The pipe connection device 100d has a second groove line 114 formed in a circumferential direction at the center of the sleeve 110 than the first groove line 111, compared to the aforementioned pipe connection device 100a. 2 It is different in that the second protruding lines 115 are formed in the circumferential direction on both sides of the groove line 114 and the O-rings 116 are installed in the second groove line 114. In this case, the relative positions of the joint 130 and the sleeve 110 may be determined so that the metal ring 131 compresses between the first and second home lines 111 and 114.

[Second Example]

7A is a cross-sectional view showing a pipe connecting device according to a second embodiment of the present invention, and FIG. 7B is a cross-sectional view showing the pipe connecting device connecting both pipes expanded.

The pipe connection device 200 has a difference in that there is no corrugated pipe 119 in the central portion of the sleeve 110, compared to the pipe connection device 100 described above.

The sleeve 110 has a tubular shape, and both ends of the sleeve 110 and the joint are inserted into the interior of the expanded composite pipe 1 to be connected, and the tip of the joint 130 is compressed in the inserted state. (130) and the composite pipe (1) are firmly connected.

Meanwhile, FIG. 8A is a cross-sectional view showing a modified example of the pipe connecting device, and FIG. 8B is a cross-sectional view showing the pipe connecting device 200a connecting both pipes 1 to be expanded. The pipe connection device 200a is compared with the pipe connection device 200 described above, so that the two first protruding lines 112 at both ends of the sleeve 110 are continuous in the circumferential direction in a state spaced apart by a predetermined interval. The difference is that the first groove line 111 is formed between the two first protruding lines 112 and the O-ring 113 is installed in the first groove line 111. The O-ring 113 is located at the center of the sleeve 110 slightly than the metal ring 131.

The relative positions of the O-ring 113 and the metal ring 131 may be changed. For example, as shown in FIGS. 9A to 9B, the metal ring 131 and the O-ring 113 are positioned to correspond to each other (that is, the metal ring 131 is installed at a position where the O-ring 113 is pressed), As shown in FIGS. 10A to 10B, the O-ring 113 may be positioned at the end of the sleeve 110 rather than the metal ring 131.

FIG. 11A is a cross-sectional view showing another modified example of the pipe connecting device, and FIG. 11B is a cross-sectional view showing the pipe connecting device 200d connecting both pipes 1 expanded.

In the pipe connecting device 200d, compared to the aforementioned pipe connecting device 200a, the second groove line 114 is continuously formed in the circumferential direction toward the center of the sleeve 110 than the first groove line 111 , The second protrusion lines 115 are continuously formed on both sides of the second groove line 114 in the circumferential direction, and the O-ring 116 is installed on the second groove line 114. In this case, the relative positions of the joint 130 and the sleeve 110 may be determined so that the metal ring 131 compresses between the first and second home lines 111 and 114.

[Third Example]

12A is a cross-sectional view showing a pipe connecting device according to a third embodiment of the present invention, and FIG. 12B is a cross-sectional view showing that the pipe connecting device connects both expanded pipes.

As shown in the figure, the pipe connection device 300 includes a sleeve 110 and a joint 130.

The sleeve 110 has a tubular shape, and both ends thereof are inserted into the interior of the expanded composite tube 1 to be connected. The sleeve 110 is inserted into the inside of the expanded composite pipe 1, and has an outer diameter that is firmly in close contact with the composite pipe 1 when the joint 130 is compressed.

Sleeve 110 may be made of metal, preferably stainless steel. And, the sleeve 110 may be deformed for a firm coupling of the sleeve 110 and the joint 130 and the expanded composite pipe 1 when the joint 130 is compressed.

A protrusion 117 is formed at the central portion of the sleeve 110 to continuously protrude in the circumferential direction. The protrusion 117 is coupled to the inner circumferential surface of the joint 130 by electric resistance welding or the like. In addition, the expanded composite pipe 1 is inserted between the joint 130 and the sleeve 110, and the protrusion 117 serves as a stopper to limit the insertion length of the composite pipe 1.

The joint 130 is installed outside the sleeve 110. Specifically, the joint 130 is a tubular member, and the sleeve 110 is inserted into the joint 130 and the inner surface of the central portion of the joint 130 is coupled with the protrusion 117. In the first and second embodiments, two joints 130 are respectively coupled to both ends of the sleeve 110, but the pipe connecting device 300 has a difference in that one joint 130 is coupled to the sleeve 110.

13A is a cross-sectional view showing a modified example of the pipe connecting device, and FIG. 13B is a cross-sectional view showing the tube connecting device 300a connecting both pipes 1 to be expanded. The pipe connection device 300a is, compared with the pipe connection device 300 described above, so that the two first protruding lines 112 at both ends of the sleeve 110 are continuously in the circumferential direction in a state spaced apart by a predetermined interval. The difference is that the first groove line 111 is formed between the two first protruding lines 112 and the O-ring 113 is installed in the first groove line 111. The O-ring 113 is located at the center of the sleeve 110 slightly than the metal ring 131.

The relative positions of the O-ring 113 and the metal ring 131 may be changed. For example, as shown in FIGS. 14A to 14B, the metal ring 131 and the O-ring 113 are positioned to correspond to each other (that is, the metal ring 131 is installed at a position where the O-ring 113 is pressed), As shown in FIGS. 15A to 15B, the O-ring 113 may be located at the end of the sleeve 110 rather than the metal ring 131.

On the other hand, FIGS. 16A to 16B show that the second home line 114 is formed in a circumferential direction at the center of the sleeve 110 than the first home line 111, and the second protruding lines are on both sides of the second home line 114. 115 is formed in the circumferential direction, and the O-ring 116 is installed in the second groove line 114. In this case, the relative positions of the joint 130 and the sleeve 110 may be determined so that the metal ring 131 compresses between the first and second home lines 111 and 114.

[Fourth Example]

17A is a cross-sectional view showing a pipe connecting device according to a fourth embodiment of the present invention, and FIG. 17B is a cross-sectional view showing that the pipe connecting device connects both expanded pipes.

The pipe connection device 400, compared with the aforementioned pipe connection device 300, does not have a protrusion 117 in the sleeve 110, and a concave groove 137 in the central portion of the joint 130 is continuously in the circumferential direction. It is formed, there is a difference that the groove 137 is coupled to the outer surface of the sleeve 110. The composite pipe 1 is inserted between the sleeve 110 and the joint 130, and the configuration in which the concave groove 137 is coupled to the outer surface of the sleeve 110 limits the insertion length of the composite pipe 1. And, the coupling of the groove 137 and the outer surface of the sleeve 110 may be made by electric resistance welding or the like.

18A is a cross-sectional view showing a modified example of the pipe connecting device, and FIG. 18B is a cross-sectional view illustrating that the pipe connecting device 400a connects both expanded pipes. The pipe connection device 400a is, compared with the pipe connection device 400 described above, so that the two first protruding lines 112 at both ends of the sleeve 110 are continuously in the circumferential direction in a state spaced apart by a predetermined interval. The difference is that the first groove line 111 is formed between the two first protruding lines 112 and the O-ring 113 is installed in the first groove line 111. The O-ring 113 is located at the center of the sleeve 110 slightly than the metal ring 131.

The relative positions of the O-ring 113 and the metal ring 131 may be changed. For example, as shown in Figs. 19A to 19B, the metal ring 131 and the O-ring 113 are positioned to correspond to each other (that is, the metal ring 131 is installed at a position where the O-ring 113 is pressed), As shown in FIGS. 20A to 20B, the O-ring 113 may be located at the end of the sleeve 110 rather than the metal ring 131.

On the other hand, FIGS. 21A to 21B show that the second home line 114 is formed in a circumferential direction at the center of the sleeve 110 than the first home line 111, and the second protruding lines are on both sides of the second home line 114. 115 is formed in the circumferential direction, and the O-ring 116 is installed in the second groove line 114. In this case, the relative positions of the joint 130 and the sleeve 110 may be determined so that the metal ring 131 compresses between the first and second home lines 111 and 114.

[Examples 5 to 8]

22a to 25b show a pipe connecting device for connecting a composite pipe that has not been expanded.

Specifically, the pipe connection device 500 of FIGS. 22A to 22B differs from the pipe connection device 200 in that the end of the composite pipe 1 is connected in an unexpanded state, and the rest of the configuration is substantially the same. .

In addition, the pipe connection device 600 of FIGS. 23A to 23B differs from the pipe connection device 300 in that the end of the composite pipe 1 is connected without being expanded, and the remaining configurations are substantially the same.

In addition, the pipe connection device 700 of FIGS. 24A to 24B differs from the pipe connection device 400 in that the end of the composite pipe 1 is connected without being expanded, and the remaining configurations are substantially the same.

Further, the pipe connection device 800 of FIGS. 25A to 25B is different from the pipe connection device 100 in that the end of the composite pipe 1 is connected without being expanded, and the remaining configurations are substantially the same.

1: composite pipe 2: thin plate stainless steel pipe
3: resin layer 4: adhesive layer
110: sleeve 111: first home line
112: first protrusion line 113: O-ring
114: second home line 115: second protruding line
116: O-ring 117: protrusion
119: corrugated pipe 130: joint
131: metal tube 131a: tooth
132: O-ring 133: first seating portion
134: second seating portion 135: chin
137: groove
100, 100a, 100b, 100c, 100d, 200, 200a, 200b, 200c, 200d, 300, 300a, 300b, 300c, 300d, 400, 400a, 400b, 400c, 400d, 500, 600, 700, 800: pipe connection Device

Claims (13)

In the method of connecting both pipes using a pipe connection device,
(a) inserting the ends of both pipes between the sleeve 110 and the joint 130, respectively; And,
(b) after the step (a), compressing the joint 130 to combine the end of the tube with the joint 130 and the sleeve 110; Including,
The O-ring 132 and the metal ring 131 are installed on the inner circumferential surface of the end of the joint 130, and the O-ring 132 and the metal ring 131 are attached to the outer circumferential surface of the tube by the compression in step (b). Pipe connection method, characterized in that in close contact. The method of claim 1,
Prior to the step (a), further comprising the step of expanding the ends of both pipes, respectively,
The step (a) is a pipe connection method, characterized in that inserting the ends of the expanded pipe between the sleeve (110) and the joint (130), respectively. The method according to claim 1 or 2,
The joint 130 is respectively installed at both ends of the sleeve 110, the O-ring 132 and the metal ring 131 are installed at the front end of the joint 130, and the rear end of the joint 130 is a sleeve 110 Is coupled to the outer peripheral surface of
Pipe connection method, characterized in that the insertion length of the pipe in the step (a) is limited by coupling the rear end of the joint 130 to the outer peripheral surface of the sleeve 110. The method according to claim 1 or 2,
One joint 130 is installed on the outer circumferential surface of the sleeve 110, but the sleeve 110 is inserted into the joint 130, and a groove 137 is continuously formed in the circumferential direction in the central portion of the joint 130 And the groove 137 is coupled to the outer peripheral surface of the sleeve 110,
Pipe connection method, characterized in that the insertion length of the pipe in the step (a) is limited by the groove 137 being coupled to the outer peripheral surface of the sleeve 110. The method according to claim 1 or 2,
One joint 130 is installed on the outer circumferential surface of the sleeve 110, but the sleeve 110 is inserted into the joint 130, and the protrusion 117 is continuously formed in the circumferential direction at the central portion of the sleeve 110 And the protrusion 117 is coupled to the inner circumferential surface of the joint 130,
Pipe connection method, characterized in that the insertion length of the pipe in the step (a) is limited by the protrusion 117 being coupled to the inner peripheral surface of the joint 130. The method according to claim 1 or 2,
A pipe connection method, characterized in that a tooth portion 131a is formed on the inner surface of the metal ring 131 in a circumferential direction, and the tooth portion 131a is press-fitted to the outer peripheral surface of the pipe to be fixed. The method according to claim 1 or 2,
The front end of the joint 130 includes a first seating portion 133 and a second seating portion 134,
The first seating portion 133 is continuously formed in the circumferential direction so that the metal ring 131 is seated,
The second seating portion 134 is continuously formed in the circumferential direction so that the O-ring 132 is seated, and is formed adjacent to the first seating portion 133,
The pipe connection method, characterized in that the first and second seating portions 133 and 134 are moved toward the sleeve 110 by the compression, and the metal ring 131 is pressed into the outer peripheral surface of the pipe. The method of claim 7,
A jaw 135 is formed between the first and second seating portions 133 and 134, and accordingly, the first seating portion 133 protrudes further outward than the second seating portion 134, and is removed by the compression. The method of connecting a pipe, characterized in that the 1,2 seating parts 133 and 134 are located on the same plane and the jaws 135 are removed. The method according to claim 1 or 2,
The central part of the sleeve 110 is made of a corrugated pipe 119, so that the sleeve 110 is free to bend,
The joint 130 is installed at both ends of the sleeve 110, but the rear end of the joint 130 is coupled to the outer circumferential surface of the sleeve 110, and the combined portion includes the sleeve 110 and the joint 130 ) Pipe connection method, characterized in that it acts as a stopper when inserted between. The method according to claim 1 or 2,
At both ends of the sleeve 110, two first protruding lines 112 are continuously formed in a circumferential direction so as to be spaced apart by a predetermined distance, and a first groove line 111 is formed between the two first protruding lines 112. It is continuously formed in a circumferential direction, and an O-ring 113 for watertightness is installed in the first groove line 111,
O-ring 113 is a pipe connection method, characterized in that located at the end side of the sleeve 110 than the metal ring 131, located at the center of the sleeve 110, or located at a location corresponding to the metal ring 131. The method of claim 10,
The second groove line 114 is formed in the circumferential direction at the center of the sleeve 110 than the first groove line 111, and the second protruding lines 115 are circumferentially formed on both sides of the second groove line 114 Is formed, and the second groove line 114 is provided with an O-ring 116,
A pipe connection method, characterized in that the relative positions of the joint 130 and the sleeve 110 are determined so that the metal ring 131 compresses between the first and second groove lines 111 and 114. The method according to claim 1 or 2,
The tube is a composite tube,
The composite pipe,
A thin stainless steel metal tube 2;
An adhesive layer 4 formed on the outer peripheral surface of the thin stainless steel metal tube 2; And,
Pipe connection method comprising a; resin layer (3) formed on the outer peripheral surface of the adhesive layer (4). The method of claim 12,
Pipe connection method, characterized in that the sleeve 110, the joint 130 and the metal ring 131 are made of stainless steel.

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