Self-service buckling and pressing type large-diameter high-pressure composite RTP pipeline joint

Abstract

The utility model discloses a self-service buckling and pressing type large-caliber high-pressure composite RTP pipeline joint, and belongs to the technical field of pipeline joints, a joint body comprises a flange connector, a connecting shaft neck, a fastening flange and an inner sleeve which are sequentially arranged, the inner sleeve penetrates into an RTP composite pipeline to be connected and is in interference fit with the composite pipeline, and external threads are arranged on the fastening flange; the multiple tensioning pressing blocks are evenly distributed on the periphery of the composite pipeline, and the thicknesses of the tensioning pressing blocks are gradually reduced in the axial direction. The pressing sleeve is arranged on the periphery of the tensioning pressing block in a sleeving mode, the pressing sleeve and the tensioning pressing block are arranged in a matched mode, and internal threads matched with the external threads are arranged on the inner side of the large-diameter end of the pressing sleeve. By means of the self-service buckling-pressing type large-diameter high-pressure composite RTP pipeline connector, the problem that large-diameter high-pressure composite RTP pipelines cannot be connected after being produced is solved.

Description

Technical Field

[0001] This utility model belongs to the field of pipe joint technology, specifically, it relates to a self-crimping type large-diameter high-pressure composite RTP pipe joint. Background Technology

[0002] Reinforced thermoplastic pipes (RTP) typically consist of three layers: an inner and an outer plastic layer, and a reinforcing layer made of reinforcing material placed between the inner and outer plastic layers.

[0003] For RTP pipes, pipes are typically connected using electrofusion-thermal fusion and mechanical compression methods. Electrofusion-thermal fusion connections have drawbacks such as low connection strength and poor sealing performance. Mechanical compression connections are mainly used in high-pressure applications and generally employ crimp fittings. Research shows that there are currently methods for fabricating fittings similar to those for high-pressure oil pipes. However, these methods are relatively complex and difficult to master. Utility Model Content

[0004] To solve the above problems, the present invention adopts the following technical solution:

[0005] A self-crimping type large-diameter high-pressure composite RTP pipe fitting includes:

[0006] The connector body includes a flange interface, a connecting journal, a fastening flange and an inner sleeve arranged in sequence. The inner sleeve is inserted into the RTP composite pipe to be connected and is interference-fitted with the RTP composite pipe. The fastening flange is provided with external threads.

[0007] Multiple tensioning blocks are evenly distributed around the outer periphery of the composite pipe, and the thickness of the tensioning blocks gradually decreases along the axial direction.

[0008] A tapered pressure sleeve is fitted around the outer periphery of the tensioning block, and the pressure sleeve is configured to cooperate with the tensioning block. The inner side of the large diameter end of the pressure sleeve is provided with an internal thread that mates with the external thread.

[0009] Furthermore, a sealing element is provided at the connection between the fastening flange and the composite pipe to prevent external gas or liquid from penetrating into the reinforcing layer of the composite pipe.

[0010] Furthermore, the inner wall of the tensioning block is provided with serrated threads.

[0011] Furthermore, the end face of the thicker end of the multiple tensioning blocks is provided with a first positioning hole, and the end face of the fastening flange is provided with multiple second positioning holes corresponding to the first positioning holes. The first positioning holes and the corresponding second positioning holes are fixed by positioning pins.

[0012] Furthermore, a hook wrench hole is provided on the outer side of the large-diameter end of the pressure sleeve.

[0013] The beneficial effects of this utility model are:

[0014] This utility model solves the problem of large-diameter high-pressure composite RTP pipes being unable to be connected after production by using a self-clamping type large-diameter high-pressure composite RTP pipe joint.

[0015] The connector body and the pressure sleeve of this utility model are equipped with a threaded structure, which can be operated without professional skills when tightening. It can ensure that the 360-degree force generated by the pressure sleeve on the tensioning block is balanced. Under the action of the taper, the tensioning block moves towards the axis of the RTP composite pipe to achieve compression and complete the installation of the high-pressure connector, which greatly shortens the construction time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of a self-clamping type large-diameter high-pressure composite RTP pipe joint according to the present invention.

[0017] Figure 2 This is an exploded view of a self-clamping type large-diameter high-pressure composite RTP pipe joint according to the present invention.

[0018] In the diagram: 1. Connector body; 11. Flange interface; 12. Connecting journal; 13. Fastening flange; 14. Inner sleeve; 15. External thread; 2. Hook wrench hole; 3. Positioning pin; 4. Seal; 5. RTP composite pipe; 6. Tensioning block; 61. Serrated thread; 7. Pressure sleeve; 71. Internal thread. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example 1

[0021] refer to Figures 1 to 2 A self-crimping type large-diameter high-pressure composite RTP pipe fitting, comprising:

[0022] The connector body 1 includes a flange interface 11, a connecting journal 12, a fastening flange 13 and an inner sleeve 14 arranged sequentially. The inner sleeve 14 is inserted into the RTP composite pipe 5 to be connected and is interference-fitted with the composite pipe. The fastening flange 13 is provided with an external thread 15.

[0023] Multiple tensioning blocks 6 are evenly distributed around the outer periphery of the composite pipe, and the thickness of the tensioning blocks 6 gradually decreases along the axial direction.

[0024] A tapered pressure sleeve 7 is fitted around the outer periphery of the tensioning block 6, and the pressure sleeve 7 is fitted with the tensioning block 6. The inner side of the large diameter end of the pressure sleeve 7 is provided with an internal thread 71 that mates with the external thread 15.

[0025] This utility model solves the problem of large-diameter high-pressure composite RTP pipes being unable to be connected after production by using a self-clamping type large-diameter high-pressure composite RTP pipe joint.

[0026] This utility model can be prefabricated in the factory or installed on the construction site, which is quite convenient. Each RTP composite pipe 5 is equipped with such a connector at both ends. During pipe construction, simply tighten the flange interface 11 with the corresponding screws. Moreover, the connector can be made on-site according to the length at the final pipe connection, which greatly shortens the construction time.

[0027] Example 2

[0028] To reduce the risk of pipeline decommissioning, this embodiment makes further modifications based on embodiment 1.

[0029] In this embodiment, a sealing element 4 is provided at the connection between the fastening flange 13 and the composite pipe to prevent external gas and liquid from seeping into the reinforcing layer of the composite pipe, thus solving the risk that the pipe will be scrapped once water seeps in when the reinforcing layer is made of glass fiber.

[0030] Example 3

[0031] To increase friction, this embodiment makes further modifications based on embodiment 1 or embodiment 2.

[0032] In this embodiment, the inner wall of the tensioning block 6 is provided with a serrated thread 61, and the inner wall has a serrated multi-wedge tensioning block to increase friction.

[0033] In practice, the length L of the tensioning block 6 is determined based on the pressure bearing capacity of the RTP pipeline. When designing the joint, the friction between the inner wall of the tensioning block 6 and the pressure-bearing surface of the RTP pipeline must be greater than the tension force generated by the pressure bearing capacity of the RTP composite pipeline on the joint to ensure that the tensioning block 6 does not slip on the surface of the RTP pipeline, while also preventing damage to the surface of the RTP pipeline. In other words, the higher the pressure bearing capacity requirement of the RTP pipeline, the longer L in the tensioning block 6.

[0034] In this embodiment, the end face of the thicker end of the multiple tensioning blocks 6 is provided with a first positioning hole, and the end face of the fastening flange 13 is provided with multiple second positioning holes corresponding to the first positioning holes. The first positioning holes and the corresponding second positioning holes are fixed by positioning pins 3.

[0035] In practice, the positioning pin 3 can prevent rotation during the tightening process.

[0036] In this embodiment, a hook wrench hole 2 is provided on the outer side of the large diameter end of the pressure sleeve 7.

[0037] Example 4

[0038] This embodiment provides a construction method for a self-crimping type large-diameter high-pressure composite RTP pipe joint, using one of the self-crimping type large-diameter high-pressure composite RTP pipe joints from Embodiment 1, Embodiment 2, or Embodiment 3. The construction method includes the following steps:

[0039] S10. Pre-machine the connector body 1 with flange interface 11 according to the inner hole of RTP composite pipe 5;

[0040] S20. During construction, first put the tapered compression sleeve 7 onto the RTP composite pipe 5;

[0041] S30. Install the sealing element 4 onto the connector body 1, and insert the inner sleeve 14 of the connector body 1 into the RTP composite pipe 5.

[0042] S40. Install the tensioning block 6, move the tapered pressure sleeve 7 to the left to the threaded part of the connector body 1, and tighten the pressure sleeve 7 by using a hook wrench to hold the hook plate hole.

[0043] In practice, the flanged connector body 1 is pre-machined according to the inner hole of the RTP composite pipe 5. During construction, the tapered compression sleeve 7 is first installed according to... Figure 2 Insert the RTP composite pipe 5 into the connector body 1, install the sealing element 4 onto the connector body 1, insert the connector body 1 into the RTP composite pipe 5, install the tensioning block 6, move the tapered pressure sleeve 7 to the left to the threaded part of the connector body 1, and tighten the pressure sleeve 7 by using a hook wrench to hold the hook plate hole 2. Due to the use of a threaded structure, this tightening work can be done without professional skills, ensuring that the force generated by the pressure sleeve 7 on the tensioning block 6 is balanced 360 degrees. Under the action of the tapered shape, the tensioning block 6 moves towards the axis of the RTP composite pipe 5 until it is pressed tightly, and a high-pressure connector is installed.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model are included within the protection scope of this utility model.

Claims

1. A self-pressing large-diameter high-pressure composite RTP pipe joint, characterized in that, include: The connector body includes a flange interface, a connecting journal, a fastening flange and an inner sleeve arranged in sequence. The inner sleeve is inserted into the RTP composite pipe to be connected and is interference-fitted with the RTP composite pipe. The fastening flange is provided with external threads. Multiple tensioning blocks are evenly distributed around the outer periphery of the composite pipe, and the thickness of the tensioning blocks gradually decreases along the axial direction. A tapered pressure sleeve is fitted around the outer periphery of the tensioning block, and the pressure sleeve is configured to cooperate with the tensioning block. The inner side of the large diameter end of the pressure sleeve is provided with an internal thread that mates with the external thread.

2. The self-pressing large-diameter high-pressure composite RTP pipe joint according to claim 1, characterized in that, A sealing element is provided at the connection between the fastening flange and the composite pipe to prevent external gas or liquid from penetrating into the reinforcing layer of the composite pipe.

3. The self-crimping type large-diameter high-pressure composite RTP pipe joint according to claim 1, characterized in that, The inner wall of the tensioning block is provided with a sawtooth thread.

4. The self-crimping type large-diameter high-pressure composite RTP pipe joint according to claim 3, characterized in that, The end face of the thicker end of the multiple tensioning blocks is provided with a first positioning hole, and the end face of the fastening flange is provided with multiple second positioning holes corresponding to the first positioning holes. The first positioning holes and the corresponding second positioning holes are fixed by positioning pins.

5. A self-crimping type large-diameter high-pressure composite RTP pipe joint according to claim 4, characterized in that, A hook wrench hole is provided on the outer side of the large-diameter end of the pressure sleeve.

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