Connecting structure of PEEK tube and metal joint

By using stamping and fusion forming technology of outer metal joints, inner metal reinforced pipes and PEEK pipes in the connection structure between PEEK pipes and metal joints, the problem that PEEK pipes cannot be injected into an integrated joint structure is solved, and multiple connections of large-pipe PEEK pipes and the formation of large-diameter PEEK pipes are achieved.

CN222992479UActive Publication Date: 2025-06-17XIAN ORIENT MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202422149003.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-02
Publication Date
2025-06-17
Estimated Expiration
2034-09-02

AI Technical Summary

Technical Problem

The PEEK tube cannot be injected into an integrated joint structure on the pipe body, resulting in fewer connection forms, especially large pipe diameters and difficulties in connecting multiple pipes.

Method used

The connection structure including outer metal joints, inner metal reinforced pipes and PEEK pipes is adopted. Through the cogging gap and stamping fusion molding technology, the inner metal reinforced pipes, PEEK pipes and outer metal joints are stamped and fused in turn to form an integral connection.

Benefits of technology

Multiple connections of large-pipe PEEK pipelines are realized to form a large-pipe system, which meets strength, sealing, stability and reliability, and reduces operating costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a connecting structure of a PEEK pipe and a metal connector, and relates to the technical field of PEEK pipes. The PEEK pipe joint comprises an outer metal joint, an inner metal reinforcing pipe and a PEEK pipe, a tooth groove gap is formed between the inner wall of the first end of the outer metal joint and the outer wall of the first end of the inner metal reinforcing pipe, the end of the PEEK pipe extends into and fills the tooth groove gap, and the inner metal reinforcing pipe, the PEEK pipe and the outer metal joint are sequentially formed in a stamping and fusing mode from inside to outside and connected into a whole. The PEEK pipe can be connected with an external structure through the outer metal connector or connected with another PEEK pipe, so that multiple times of connection of large-pipe-diameter PEEK pipelines can be achieved, a large-scale pipeline system is formed, and by adopting the connection mode of stamping fusion forming, the large-pipe-diameter PEEK pipelines can be manufactured from the materials and characteristics of all product parts. The strength, the sealing performance, the stability and the reliability of the product are met, and the operation cost is controllable.
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Description

Technical Field

[0001] The utility model relates to the technical field of PEEK pipes, in particular to a connection structure between a PEEK pipe and a metal joint. Background Art

[0002] In the domestic aviation field, more and more pipelines used in low-pressure pipeline systems are replaced by high-performance polyetheretherketone plastic pipes called PEEK. On the premise of meeting the pipeline functions, PEEK pipelines can keep sufficient flexibility, can be bent as required in an appropriate amount, and are pipelines with light weight and good heat resistance, which is beneficial to the lightweight design of aircraft.

[0003] The applicant of the present invention discovers that there are at least the following technical problems in the prior art: The processing forms of PEEK pipes are usually injection molding or extrusion molding, generally with regular pipe diameters, and it is impossible to injection mold an integrated joint structure on the pipe body at the same time, resulting in fewer connection forms of PEEK pipes, especially for large-diameter pipes, which makes it difficult to connect multiple pipelines. Summary of the Utility Model

[0004] The purpose of the present invention is to provide a connection structure between a PEEK pipe and a metal joint to solve the technical problems in the prior art that the PEEK pipe cannot injection mold an integrated joint structure on the pipe body at the same time, resulting in fewer connection forms of PEEK pipes and difficulties in connecting multiple pipelines. The many technical effects that can be produced by the preferred technical solutions provided by the present invention are described in detail below.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A connection structure between a PEEK pipe and a metal joint, including an outer metal joint, an inner metal reinforcing pipe, and a PEEK pipe. A tooth groove gap is formed between the inner wall of the first end of the outer metal joint and the outer wall of the first end of the inner metal reinforcing pipe. The end of the PEEK pipe extends into and fills the tooth groove gap. The inner metal reinforcing pipe, the PEEK pipe, and the outer metal joint are integrally formed by stamping from the inside to the outside in sequence. The second end of the outer metal joint is connected to an external structure or the second end of another outer metal joint.

[0007] Preferably, the inner wall of the first end of the outer metal joint is provided with a first fusion tooth groove, and the outer wall of the first end of the inner metal reinforcing pipe is provided with a second fusion tooth groove. The tooth groove gap is formed between the first fusion tooth groove and the second fusion tooth groove.

[0008] Preferably, the first fusion tooth groove and the second fusion tooth groove are distributed in an axially offset manner.

[0009] Preferably, a first mating groove group is provided on the inner wall of the second end of the outer metal joint, and a second mating groove group is provided on the outer wall of the second end of the inner metal reinforcing tube, and the first mating groove group is in extrusion fit with the second mating groove group.

[0010] Preferably, a plurality of auxiliary slits are circumferentially formed at the second end of the inner metal reinforcing tube.

[0011] Preferably, the plurality of auxiliary slits are evenly distributed.

[0012] Preferably, the second end of the outer metal joint is provided with a connecting portion and is connected to the external structure or the second end of another outer metal joint through the connecting portion.

[0013] Preferably, the connecting portion is a flange, and a plurality of connecting holes are circumferentially formed in the flange.

[0014] Preferably, a sealing groove is formed on the end face of the second end of the outer metal joint, and the sealing groove is used for placing a sealing ring.

[0015] The beneficial effects of the present utility model are as follows: The inner metal reinforcing tube, the PEEK tube and the outer metal joint can be connected to form a whole. The PEEK tube can be connected to the external structure through the outer metal joint or connected to another PEEK tube, thereby enabling multiple connections of large-diameter PEEK pipelines to form a large pipeline system.

[0016] By adopting the connection method of stamping and fusion molding, it is possible to start from the materials and characteristics of each product part, meet the strength, sealing performance and stable reliability of the product, and the operation cost is controllable. It opens up a new direction for the connection of PEEK pipeline systems and can be widely applied to pipeline systems in many fields such as aviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a cross-sectional view structure diagram when the PEEK tube of the present utility model does not fully extend into the tooth groove gap;

[0019] Figure 2 is Figure 1 the enlarged structure diagram at A in

[0020] Figure 3The sectional view structure diagram after the PEEK tube of the present utility model completely extends into the alveolar space;

[0021] Figure 4 The three-dimensional structure diagram after the combination of the outer metal joint and the inner metal reinforcing tube of the present utility model;

[0022] In the figure: 1. Outer metal joint; 11. First fusion tooth groove; 12. First mating groove group; 13. Connection part; 131. Connection hole; 14. Sealing groove;

[0023] 2. Inner metal reinforcing tube; 21. Second fusion tooth groove; 22. Second mating groove group; 23. Auxiliary seam;

[0024] 3. PEEK tube;

[0025] 4. Alveolar space. Specific implementation mode

[0026] To make the purpose, technical solution and advantages of the present utility model clearer, the technical solution of the present utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other implementation manners obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope protected by the present utility model.

[0027] In the description of the present utility model, it should be understood that the terms "center", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. indicate the orientation or positional relationship based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0028] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] Refer to Figures 1 to 4, the present utility model provides a connection structure between a PEEK pipe and a metal joint, which includes an outer metal joint 1, an inner metal reinforcing pipe 2 and a PEEK pipe 3. A tooth groove gap 4 is formed between the inner wall of the first end of the outer metal joint 1 and the outer wall of the first end of the inner metal reinforcing pipe 2. The end of the PEEK pipe 3 can extend into the tooth groove gap 4 and fill the tooth groove gap 4. The inner metal reinforcing pipe 2, the PEEK pipe 3 and the outer metal joint 1 are sequentially formed by stamping and fusing from the inside to the outside, so that the inner metal reinforcing pipe 2, the PEEK pipe 3 and the outer metal joint 1 are connected to form a whole;

[0030] The second end of the outer metal joint 1 is connected to an external structure or the second end of another outer metal joint 1. Therefore, the PEEK pipe 3 can be connected to the external structure through the outer metal joint 1, or connected to another PEEK pipe 3, thereby enabling multiple connections of large-diameter PEEK pipelines to form a large pipeline system;

[0031] By adopting the connection method of stamping and fusing, it is possible to start from the materials and characteristics of each product part to meet the strength, sealing performance and stable reliability of the product, with controllable operation costs, opening a new direction for the connection of PEEK pipeline systems, and can be widely applied to pipeline systems in many fields such as aviation.

[0032] The manufacturing method of the connection structure between the PEEK pipe and the metal joint mentioned in this embodiment is as follows: First, the PEEK pipe 3 needs to be installed in an external stamping device. After adjusting the height position appropriately, a special heating mold is assembled at the end of the PEEK pipe 3, connected to a mold temperature controller, and heated to between 315° and 340°, and then the heating mold is removed;

[0033] Then, the pre-assembled outer metal joint 1 and inner metal reinforcing pipe 2 are sleeved on the end of the PEEK pipe 3, and a protective fixing bracket is installed outside the outer metal joint 1. The purpose of the protective fixing bracket here is to protect the outer metal joint 1 from deforming and moving under force;

[0034] Then, the stamping device is started, and the upper mold of the stamping device is used to stamp from the central hole of the inner metal reinforcing pipe 2, so that the inner metal reinforcing pipe 2 deforms and expands, extrudes and deforms the PEEK pipe 3, and fills the tooth groove gap 4 between the inner metal reinforcing pipe 2 and the outer metal joint 1, so that the inner metal reinforcing pipe 2, the PEEK pipe 3 and the outer metal joint 1 are stamped and fused into a whole.

[0035] The outer metal joint 1 is preferably machined from aviation 7075 aluminum, and the first fusion tooth groove 11, the first matching groove group 12, the connecting part 13 and the sealing groove 14 are processed in advance. The inner metal reinforcement tube 2 is preferably machined from 6061 aluminum, and the second fusion tooth groove 21, the second matching groove group 22 and the auxiliary seam 23 are processed in advance. The above settings can ensure the required dimensional accuracy and necessary connection performance.

[0036] As an optional implementation, the inner wall of the first end of the outer metal joint 1 is provided with a first fusion tooth groove 11, and the outer wall of the first end of the inner metal reinforcement tube 2 is provided with a second fusion tooth groove 21, and a tooth groove gap 4 is formed between the first fusion tooth groove 11 and the second fusion tooth groove 21. When the inner metal reinforcement tube 2, the PEEK tube 3 and the outer metal joint 1 are stamped and fused from the inside to the outside in sequence under the action of an external stamping device, the outer wall of the PEEK tube 3 can contact the first fusion tooth groove 11, and the inner wall of the PEEK tube 3 can contact the second fusion tooth groove 21.

[0037] As an optional implementation, the first fused tooth groove 11 and the second fused tooth groove 21 are staggered in the axial direction, and the staggered distribution causes the teeth of the first fused tooth groove 11 and the second fused tooth groove 21 to be relatively staggered. When the inner metal reinforcement tube 2, the PEEK tube 3 and the outer metal joint 1 are stamped and fused in sequence from the inside to the outside under the action of external stamping equipment, it has a better extrusion molding effect, making the connection between the inner metal reinforcement tube 2, the PEEK tube 3 and the outer metal joint 1 more firm.

[0038] As an optional implementation, the second end of the outer metal joint 1 and the second end of the inner metal reinforcement tube 2 are relatively located at an end away from the PEEK tube 3, the inner wall of the second end of the outer metal joint 1 is provided with a first matching groove group 12, and the outer wall of the second end of the inner metal reinforcement tube 2 is provided with a second matching groove group 22. The shapes of the first matching groove group 12 and the second matching groove group 22 match each other. In the process of stamping and fusion molding of the inner metal reinforcement tube 2, the PEEK tube 3 and the outer metal joint 1 from the inside to the outside in sequence under the action of external stamping equipment, the first matching groove group 12 and the second matching groove group 22 can form an extrusion fit, thereby further stabilizing the connection between the outer metal joint 1 and the inner metal reinforcement tube 2.

[0039] As an alternative implementation, a plurality of auxiliary slits 23 are circumferentially formed at the second end of the inner metal reinforcing tube 2. Since the outer metal joint 1 is also provided with the following connecting portion 13 at the second end, the outer metal joint 1 has a certain thickness at the second end, and has higher structural strength and stiffness compared to the first end. Therefore, through the arrangement of the auxiliary slits 23, during the process of the inner metal reinforcing tube 2, the PEEK tube 3, and the outer metal joint 1 being sequentially press-fused from the inside to the outside under the action of an external stamping device, the second end of the inner metal reinforcing tube 2 is more easily deformed under force at the auxiliary slits 23, thereby forming a better connection with the outer metal joint 1;

[0040] In this embodiment, the auxiliary slits 23 are evenly distributed circumferentially. With such an arrangement, the force can be more evenly balanced.

[0041] As an alternative implementation, the second end of the outer metal joint 1 is provided with a connecting portion 13. The outer metal joint 1 can be connected to an external structure or the second end of another outer metal joint 1 through the connecting portion 13. The additionally provided connecting portion 13 does not affect the structural forms of the inner walls of the first end and the second end of the outer metal joint 1;

[0042] In this embodiment, the specific structural form of the connecting portion 13 is preferably a flange. The flange is circumferentially provided with a plurality of connecting holes 131. Here, the plurality of connecting holes 131 are evenly distributed. The flange can form a flange connection with an external structure or another flange. While having good connection strength and sealing degree, the flange connection can also achieve convenient and quick disassembly and assembly.

[0043] As an alternative implementation, a sealing groove 14 is formed on the end face of the second end of the outer metal joint 1. The sealing groove 14 is used for placing a sealing ring, and the sealing ring can further improve the sealing effect of the outer metal joint 1 after being connected to an external structure or another outer metal joint 1.

[0044] The above are only the specific implementation manners of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A connection structure of a PEEK tube and a metal joint, characterized in that: The invention comprises an outer metal joint (1), an inner metal reinforcement tube (2) and a PEEK tube (3); a tooth groove gap (4) is formed between the inner wall of the first end of the outer metal joint (1) and the outer wall of the first end of the inner metal reinforcement tube (2); the end of the PEEK tube (3) extends into and fills the tooth groove gap (4); the inner metal reinforcement tube (2), the PEEK tube (3) and the outer metal joint (1) are stamped and fused in sequence from the inside to the outside; and the second end of the outer metal joint (1) is connected to an external structure or the second end of another outer metal joint (1).

2. The connection structure of the PEEK tube and the metal joint according to claim 1, characterized in that: The inner wall of the first end of the outer metal joint (1) is provided with a first fusion tooth groove (11), and the outer wall of the first end of the inner metal reinforcement tube (2) is provided with a second fusion tooth groove (21), and the tooth groove gap (4) is formed between the first fusion tooth groove (11) and the second fusion tooth groove (21).

3. The connection structure of the PEEK tube and the metal joint according to claim 2, characterized in that: The first fused tooth groove (11) and the second fused tooth groove (21) are staggered in the axial direction.

4. The connection structure of the PEEK tube and the metal joint according to claim 1, characterized in that: The inner wall of the second end of the outer metal joint (1) is provided with a first matching groove group (12), and the outer wall of the second end of the inner metal reinforcement tube (2) is provided with a second matching groove group (22), and the first matching groove group (12) and the second matching groove group (22) are extrusion-matched.

5. The connection structure of the PEEK tube and the metal joint according to claim 1, characterized in that: The second end of the inner metal reinforcement tube (2) is provided with a plurality of auxiliary seams (23) along the circumferential direction.

6. The connection structure of the PEEK tube and the metal joint according to claim 5, characterized in that: A plurality of auxiliary seams (23) are evenly distributed.

7. The connection structure of the PEEK tube and the metal joint according to claim 1, characterized in that: The second end of the external metal joint (1) is provided with a connecting portion (13) and is connected to the external structure or the second end of another external metal joint (1) via the connecting portion (13).

8. The connection structure of the PEEK tube and the metal joint according to claim 7, characterized in that: The connecting portion (13) is a flange plate, and the flange plate is provided with a plurality of connecting holes (131) along the circumferential direction.

9. The connection structure of the PEEK tube and the metal joint according to claim 1, characterized in that: A sealing groove (14) is provided on the end surface of the second end of the outer metal joint (1), and the sealing groove (14) is used for accommodating a sealing ring.