Composite pipe connection device and connection method

Abstract

The invention discloses a composite pipe connection device and a connection method, which relate to the technical field of pipe connection, solve the problem that the connection quality of the existing composite pipe connection cannot be guaranteed after the pipe is cut, ensure the connection length, and avoid the influence of the medium on the cut part of the composite pipe. The specific scheme is as follows: it includes a self-locking ring, a self-locking core, flanges arranged at both ends of the self-locking ring, and bolts for connecting the flanges. The self-locking ring is provided with a first channel for the medium to pass through, and the tube wall of the self-locking ring is provided with two sockets for the composite pipe end and the self-locking core to be inserted, and the sockets are relatively arranged at the two ends of the self-locking ring; the self-locking core is provided with two sets, and the two sets of self-locking cores are respectively inserted into different sockets, which are used for pressing the outer wall of the composite pipe to make the inner wall of the composite pipe close to the inner wall of the socket, and the self-locking core is provided with a second channel for the medium to pass through, and the first channel and the second channel are coaxially arranged and connected.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe connection, and in particular to a composite pipe connection device and a connection method. Background Art

[0002] During the installation of composite pipes, it is often necessary to adjust the length of the pipes. However, most of the mechanical connection methods of composite pipes are prefabricated in the factory for on-site connection. Therefore, it is impossible to prefabricate the joints after cutting the pipes on site to ensure the connection of the required pipeline length.

[0003] During the use of composite pipes, the composite layer is the main pressure-bearing structure and the composite layer should not be in contact with the medium. Therefore, the end faces of the pipes need to be sealed in advance when making connections to avoid pressure failure caused by contact between the composite layer and the medium. However, after the pipes are cut on site, there is no sealing equipment and sealing cannot be performed. Therefore, quality problems are prone to occur after the cut pipes are connected without sealing. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a composite pipe connecting device and a connecting method, wherein a socket for inserting a composite pipe is respectively arranged at both ends of a self-locking ring, and a self-locking core is allowed to be inserted, and the inner wall of the composite pipe is tightly fitted with the inner wall of the socket through the cooperation of the self-locking core and the socket, and the pipe wall end of the composite pipe is located inside the pipe wall of the self-locking ring. While ensuring the connection of the composite pipe, the pipe wall end of the composite pipe is sealed, thereby solving the problem that the existing composite pipe connection cannot guarantee the connection quality (connection length, sealing of the cut surface of the pipe wall) after the pipe is cut.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In the first aspect, the present invention provides a composite pipe connecting device, comprising a self-locking ring, a self-locking core, flanges arranged at both ends of the self-locking ring, and bolts for connecting the flanges, the self-locking ring being provided with a first channel for medium to pass through, the tube wall of the self-locking ring being provided with two sockets for the ends of the composite pipe and the insertion of the self-locking core, the sockets being relatively arranged at both ends of the self-locking ring; the self-locking core being provided with two sets, the two sets of self-locking cores being respectively inserted into different sockets, and being used for pressing the outer wall of the composite pipe to tightly fit the inner wall of the composite pipe against the inner wall of the socket, the self-locking core being provided with a second channel for medium to pass through, the first channel being coaxially arranged and connected with the second channel.

[0007] As a further implementation, a groove is provided in the socket along its circumferential direction, and an annular sealing rubber gasket is provided in the groove.

[0008] As a further implementation, a stopper arranged along the circumferential direction of the self-locking ring is provided between the two sockets to compensate for the length of the composite pipe cut and seal the end of the composite pipe wall.

[0009] As a further implementation, the socket is arranged along the circumferential direction of the self-locking ring, and the cross-section of the socket gradually decreases toward the direction approaching the stopper.

[0010] As a further implementation method, the self-locking core is a variable cross-section tube structure, divided into a large head end and a small head end, the small head end is in contact with the stopper, and the length of the self-locking core is the same as the depth of the socket.

[0011] As a further implementation, the inner diameter of the socket is smaller than the inner diameter of the composite pipe.

[0012] As a further implementation, the diameter of the second channel is smaller than the outer diameter of the composite pipe.

[0013] As a further implementation, each set of the self-locking core is assembled from at least two lock core units, and the cross-section of the lock core unit is arc-shaped.

[0014] In a second aspect, the present invention provides a method for connecting a composite pipe, which is as follows:

[0015] The composite pipes to be connected are cut on site, and a flange is installed on each composite pipe;

[0016] Place a sealing rubber pad in the groove of each socket, insert the ends of the two composite pipes to be connected into the socket from both ends of the self-locking ring, so that the ends of the composite pipes are in close contact with the side wall of the stopper;

[0017] A set of self-locking cores is respectively inserted into each socket so that the small end of the self-locking core contacts the stopper;

[0018] The two flanges are fixedly connected using bolts.

[0019] As a further implementation, the cut surface of the composite pipe is smooth and flat, and the sum of the cut lengths of the two composite pipes is the same as the thickness of the stopper.

[0020] The beneficial effects of the present invention are as follows:

[0021] (1) The present invention provides a socket for inserting the composite pipe at both ends of the self-locking ring, and allows the self-locking core to be inserted. The inner wall of the composite pipe is tightly fitted with the inner wall of the socket through the cooperation between the self-locking core and the socket. The end of the pipe wall of the composite pipe is located inside the pipe wall of the self-locking ring. While ensuring the connection of the composite pipe, the end of the pipe wall of the composite pipe is blocked, effectively avoiding the influence of the medium on the cutting part of the composite pipe.

[0022] (2) The present invention blocks the connection between the two sockets by means of a block, and the block can be used to compensate for the length of the composite pipe cut to ensure that the composite pipe cuts meet the length requirement after connection. At the same time, the pipe wall end of the composite pipe can also be blocked.

[0023] (3) The self-locking ring and the self-locking core of the present invention are both variable cross-section structures, and the inner diameter of the socket is smaller than the inner diameter of the composite pipe, and the diameter of the second channel is smaller than the outer diameter of the composite pipe, which effectively ensures the installation strength of the composite pipe in the socket. The variable cross-section setting facilitates the installation and connection of the self-locking ring and the self-locking core.

[0024] (4) The multiple lock core units of the present invention can be spliced ​​together to form a self-locking core with a variable cross-section tube. The arrangement of the lock core units makes it unnecessary to put the self-locking core on the composite pipe in advance during installation, which greatly improves the convenience of using the self-locking core. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] Figure 1 is a schematic cross-sectional view of the overall structure of a composite pipe connection device according to one or more embodiments of the present invention (in use);

[0027] Figure 2 is a schematic diagram of a main structural cross-section of a self-locking ring according to one or more embodiments of the present invention;

[0028] Figure 3 is a schematic side view of a self-locking ring according to one or more embodiments of the present invention;

[0029] Figure 4 is a schematic diagram of a main structural cross-section of a self-locking core according to one or more embodiments of the present invention;

[0030] Figure 5 is a schematic exploded side view of a self-locking ring according to one or more embodiments of the present invention;

[0031] In the figure: the distances or sizes between parts are exaggerated to show the positions of the parts, and the schematic diagram is for illustration only;

[0032] Among them, 1. self-locking ring; 2. self-locking core; 3. flange; 4. bolt; 5. sealing gasket; 6. composite pipe; 7. socket; 8. groove; 9. stopper; 10. first channel; 11. second channel; 12. lock core unit. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] As introduced in the background technology, the existing composite pipes cannot predict the joints after cutting on site, and the length requirements after the pipes are connected cannot be guaranteed. In addition, the end faces of the composite pipes cannot be sealed, which is easy to contact with the medium and cause pressure failure, and quality problems are easy to occur after connection. In order to solve the above technical problems, the present invention proposes a composite pipe connection device and a connection method.

[0035] Example 1

[0036] In a typical embodiment of the present invention, Figure 1-Figure 5 As shown, a composite pipe connection device is proposed, comprising a self-locking ring 1, a self-locking core 2 matched with the self-locking ring 1, flanges 3 arranged at both ends of the self-locking ring, and bolts 4 for connecting the two flanges 3.

[0037] Among them, there are two sets of self-locking cores 2, and the two sets of self-locking cores 2 are relatively inserted at the two ends of the self-locking ring 1; the flange 3 is set on the composite pipe 6, and the position of the self-locking ring 1 and the self-locking core 2 is fixed by cooperating with the bolt 4, while ensuring the connection strength of the two composite pipes 6.

[0038] like Figure 2-Figure 3 As shown, the self-locking ring 1 is a tubular structure, and a first channel 10 for medium passage is provided at the center position of the self-locking ring 1. The first channel 10 runs through the self-locking ring 1. Two sockets 7 are provided inside the tube wall of the self-locking ring 1. The two sockets 7 are relatively arranged at both ends of the self-locking ring 1, and the outward ends of the sockets 7 at both ends of the self-locking ring 1 are connected to the outside.

[0039] The socket 7 is mainly used for the self-locking core 2 and the composite pipe 6 to be inserted into the pipe wall of the self-locking ring 1. A stopper 9 is provided between the two sockets 7. The stopper 9 is arranged along the circumferential direction of the self-locking ring 1. The connection between the two sockets 7 is blocked by the stopper 9. The stopper 9 can be used to compensate for the length of the composite pipe 6 cut pipe to ensure that the composite pipe 6 meets the length requirement after the cut pipe is connected. At the same time, the pipe wall end of the composite pipe 6 can also be sealed.

[0040] It should be noted that the interior of the tube wall of the self-locking core 1 described in this embodiment is not the inner surface of the tube wall, but Figure 2 The tube wall is shown partially hollowed out.

[0041] The socket 7 is an annular variable-section hole structure. The socket 7 is arranged along the annular direction of the self-locking ring 1, and the cross-section of the socket 7 gradually becomes smaller towards the direction close to the block 9. When the self-locking core 2 and the composite pipe 6 are inserted into the socket 7, pressure can be provided to the outer wall of the composite pipe 6 under the action of the self-locking core 2 to make the inner wall of the composite pipe 6 tightly attached to the inner wall of the socket 7 (close to the inner wall of the self-locking ring 1).

[0042] A groove 8 is provided on the inner wall of the socket 7, and the groove 8 is arranged along the circumferential direction of the socket 7, and is mainly used for the installation of the sealing pad 5. The sealing pad 5 is an annular structure. When the self-locking core 2 and the composite pipe 6 are inserted into the socket 7, the sealing pad 5 can be used to seal the gap between the inner wall of the composite pipe 6 and the inner wall of the socket 7 to prevent the medium from flowing into the socket 7, thereby avoiding the medium from damaging the end of the composite pipe 6 after the pipe is cut.

[0043] It can be understood that the depth L of the socket 7 is the insertion depth of the composite pipe 6. The depth of the socket 7 is related to the caliber pressure of the composite pipe 6. As the caliber and pressure increase, the depth of the socket 7 continues to increase. The specific depth can be determined according to actual design requirements, and no excessive restrictions are made here.

[0044] The inner diameter d of the socket 7 (the matching size between the self-locking ring 1 and the inner diameter of the composite pipe 6) is 0.5-1 mm smaller than the inner diameter of the composite pipe 6, so as to facilitate the insertion of the composite pipe 6 into the socket 7 and facilitate sealing.

[0045] like Figure 4-Figure 5 As shown, the self-locking core 2 is a variable cross-section tube structure, which is divided into a large head end and a small head end. A second channel 11 for the medium to pass through is provided inside the self-locking core 2. The diameter D of the second channel 11 is smaller than the outer diameter of the composite pipe 6 by 6-8 mm to ensure that the composite pipe 6 is subjected to sufficient pressure to play a role in sealing connection.

[0046] The cross-section of the self-locking core 2 gradually becomes smaller towards the block 9, and the length of the self-locking core 2 is the same as the depth of the socket 7. When the self-locking core 2 is inserted into the socket 7, the inner wall of the self-locking core 2 can be used to squeeze the outer wall of the composite pipe 6.

[0047] Since the inner diameter of the self-locking core 2 (i.e., the diameter of the second channel) is smaller than the outer diameter of the composite pipe 6, setting a variable cross-section structure for the self-locking core 2 and the socket 7 can facilitate the insertion of the self-locking core 2, greatly improving the convenience of use and the speed of installation.

[0048] In order to further improve the ease of use of the self-locking core 2, the self-locking core 2 is arranged into a combined structure, that is, the self-locking core 2 is assembled from at least two lock core units 12. Specifically, the cross-section of the lock core unit 12 is arc-shaped, and multiple lock core units 12 can be spliced ​​to form a self-locking core 2 with a variable cross-section tubular shape.

[0049] The provision of the lock core unit 12 makes it unnecessary for the self-locking core 2 to be sleeved on the composite pipe 6 in advance during installation, thus facilitating the installation and use of the self-locking core 2 .

[0050] In other embodiments, in order to further improve the anti-pullout and anti-rotation capabilities of the self-locking core 2 and the self-locking ring 1, a plurality of anti-slip groove structures may be arranged on the outer surface of the self-locking core 2 along its length direction and circumferential direction. At the same time, anti-slip grooves are also arranged at the position where the socket 7 cooperates with the self-locking core 2 to increase the friction between the self-locking core 2 and the self-locking ring 1, thereby improving its anti-pullout and anti-rotation capabilities and preventing the self-locking core 2 from rotating relative to the socket 7.

[0051] Example 2

[0052] In another typical embodiment of the present invention, a method for connecting composite pipes is provided, which is specifically as follows:

[0053] First, the composite pipes 6 to be connected are cut on site so that the sum of the cut lengths of the two composite pipes 6 is the same as the thickness of the block 9, and a flange 3 is sleeved on each composite pipe 6;

[0054] The pipe cutting process is to cut the end of the composite pipe 6 to be connected, and it is necessary to ensure that the cut surface of the composite pipe 6 is smooth and flat;

[0055] A sealing rubber pad 5 is placed in the groove 8 of each socket 7;

[0056] Insert the ends of the two composite pipes 6 to be connected into the socket 7 from both ends of the self-locking ring 1, respectively, so that the ends of the composite pipes 6 are in close contact with the side walls of the stopper 9 to ensure accurate control of the connection length of the composite pipes 6. At the same time, the inner wall of the composite pipe 6 is in contact with the inner wall of the socket 7, and the inner wall of the composite pipe 6 and the inner wall of the socket 7 are sealed by the sealing pad 5;

[0057] After the two composite pipes 6 are installed in place, the self-locking ring 1 is located between the two flanges 3 , and the first channel 10 and the second channel 11 are coaxially arranged and communicated with the composite pipe 6 .

[0058] A set of self-locking core 2 is respectively inserted into each socket 7, so that the small end of the self-locking core 2 contacts the stopper 9, and the self-locking core 2 is used to press the outer wall of the composite pipe 6;

[0059] The two flanges 3 are fixedly connected by bolts 4, the position of the self-locking ring 1 is limited by the two flanges 3, and the socket 7 is blocked at the same time to prevent the composite pipe 6 from being pulled out.

[0060] The length of the self-locking core 2 is the same as the depth of the socket 7 . When the self-locking core 2 is inserted into the socket 7 , the end of the self-locking core 2 close to the flange 3 is flush with the end of the socket 7 .

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A composite pipe connection device, characterized in that: It comprises a self-locking ring, a self-locking core, flanges arranged at both ends of the self-locking ring, and bolts for connecting the flanges. The self-locking ring is provided with a first channel for medium to pass through. The inner wall of the self-locking ring is provided with two sockets for the ends of the composite pipe and the self-locking core to be inserted. The sockets are arranged at both ends of the self-locking ring relatively. The self-locking core is provided with two sets, and the two sets of self-locking cores are respectively inserted into different sockets and used for pressing the outer wall of the composite pipe to make the inner wall of the composite pipe close to the inner wall of the socket. The self-locking core is provided with a second channel for medium to pass through. The first channel is coaxially arranged with the second channel and is connected. The two flanges are fixedly connected by bolts, the position of the self-locking ring is limited by the two flanges, and the socket is sealed at the same time; A stopper is provided between the two sockets and arranged along the circumferential direction of the self-locking ring, which is used to compensate for the length of the composite pipe cut and seal the end of the composite pipe wall; The socket is configured as an annular variable cross-section hole structure, the socket is arranged along the annular direction of the self-locking ring, and the cross-section of the socket gradually decreases toward the direction close to the stopper; The self-locking core is a variable-section tube structure, divided into a large head end and a small head end, the small head end is in contact with the block, and the length of the self-locking core is the same as the depth of the socket; each set of the self-locking core is assembled from at least two lock core units, and the cross-section of the lock core unit is arc-shaped.

2. A composite pipe connection device according to claim 1, characterized in that: A groove is arranged in the socket along its circumferential direction, and an annular sealing rubber pad is arranged in the groove.

3. A composite pipe connection device according to claim 1, characterized in that: The inner diameter of the socket is smaller than the inner diameter of the composite pipe.

4. A composite pipe connection device according to claim 1, characterized in that: The second channel has a diameter smaller than an outer diameter of the composite pipe.

5. A composite pipe connection method, using a composite pipe connection device as claimed in any one of claims 1 to 4, characterized in that: The details are as follows: The composite pipes to be connected are cut on site, and a flange is installed on each composite pipe; Place a sealing rubber pad in the groove of each socket, insert the ends of the two composite pipes to be connected into the socket from both ends of the self-locking ring, so that the ends of the composite pipes are in close contact with the side wall of the stopper; A set of self-locking cores is respectively inserted into each socket so that the small end of the self-locking core contacts the stopper; The two flanges are fixedly connected using bolts.

6. A composite pipe connection method according to claim 5, characterized in that: The cut surface of the composite pipe is smooth and flat, and the total cut length of the two composite pipes is the same as the thickness of the stopper.

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