Steel wire reinforced polytetrafluoroethylene spiral pipe assembly

Abstract

The utility model provides a steel wire reinforced polytetrafluoroethylene spiral pipe assembly, relates to the technical field of spiral pipes, and aims to solve the technical problem that a polytetrafluoroethylene hose in the prior art is poor in flexural property. A steel wire reinforced polytetrafluoroethylene spiral pipe assembly comprises a spiral pipe, a metal connecting assembly and a steel wire reinforcing layer, the spiral pipe is made of polytetrafluoroethylene, a spiral groove is formed in the outer wall of the spiral pipe, the steel wire reinforcing layer is of a net structure formed by weaving a plurality of steel wires in a crossed mode, and the outer wall of the spiral pipe is coated with the steel wire reinforcing layer. The metal connecting assembly comprises a connector and a connecting base, the connector and the connecting base are connected to the two ends of the spiral pipe respectively and are each of a tubular structure, external threads are arranged on the outer wall of the connector, and internal threads used for being connected with the external threads are arranged on the inner wall of the connecting base.

Description

TECHNICAL FIELD

[0001] The utility model relates to spiral pipe technical field, specifically refers to a kind of steel wire reinforced polytetrafluoroethylene spiral pipe assembly. BACKGROUND

[0002] As the protection pipe for spaceflight, aviation aircraft wire and cable, it should have the characteristics of high and low temperature resistance, corrosion resistance, aging resistance, light weight and excellent distortion performance. The traditional metal hose used in the past is too heavy in quality. Although the polytetrafluoroethylene hose used later can meet the requirements of light weight, high temperature resistance, corrosion resistance, aging resistance and easy installation, its flexural performance is not ideal, so it is not an ideal protection pipe for spaceflight, aviation aircraft wire and cable. The hose assembly made of other engineering plastics such as polyvinyl chloride and polyethylene is also limited in application in the field of aerospace due to its poor high temperature resistance and aging resistance. SUMMARY

[0003] In view of the shortcomings of the prior art, the utility model aims to provide a steel wire reinforced polytetrafluoroethylene spiral pipe assembly to solve the technical problem of poor flexural performance of the polytetrafluoroethylene hose in the prior art.

[0004] To solve the above technical problems, the utility model provides a steel wire reinforced polytetrafluoroethylene spiral pipe assembly, which comprises a spiral pipe, a metal connecting assembly and a steel wire reinforcing layer. The spiral pipe is made of polytetrafluoroethylene. The outer wall of the spiral pipe is provided with a spiral groove. The steel wire reinforcing layer is a mesh structure formed by interlacing a plurality of steel wires. The steel wire reinforcing layer is wrapped around the outer wall of the spiral pipe. The metal connecting assembly comprises a connecting head and a connecting seat. The connecting head and the connecting seat are connected to the two ends of the spiral pipe respectively. Both the connecting head and the connecting seat are tubular structures. The outer wall of the connecting head is provided with external threads. The inner wall of the connecting seat is provided with internal threads for connecting with the external threads.

[0005] After adopting the above structure, the steel wire reinforced polytetrafluoroethylene spiral pipe assembly has the following advantages: the spiral pipe made of polytetrafluoroethylene is provided with a spiral groove on its outer wall. The flexible cooperation between the spiral groove and the steel wire reinforcing layer makes the spiral pipe assembly maintain shape stability under repeated bending conditions, so that the spiral pipe assembly has good flexural performance. The synergistic effect of the spiral groove and the steel wire reinforcing layer forms balanced load-bearing characteristics of axial tensile and radial compression, improving the overall strength of the spiral pipe assembly. The connecting head and the connecting seat not only facilitate the connection between the spiral pipe assemblies, but also facilitate the connection between the spiral pipe assembly and other aviation components.

[0006] As an improvement, the steel wire reinforcing layer comprises a forward braided layer and a reverse braided layer, the forward braided layer is arranged on the outer surface of the reverse braided layer, and the braiding directions of the forward braided layer and the reverse braided layer are opposite; by adopting the structure, the bidirectional tensile design of the forward braided layer and the reverse braided layer effectively disperses the axial and radial stress, improves the dynamic bending performance, the directions of the adjacent braided layers are opposite, and the fatigue fracture risk of the steel wire reinforcing layer due to repeated bending is reduced.

[0007] As an improvement, the steel wire reinforcing layer further comprises an anti-abrasion isolation layer, the anti-abrasion isolation layer is composed of cross-braided aramid fibers, and the braiding directions of the anti-abrasion isolation layer and the forward braided layer and the reverse braided layer all have an included angle; by adopting the structure, the anti-abrasion isolation layer can reduce the abrasion amount of the forward braided layer and the reverse braided layer.

[0008] As an improvement, the included angle between the braiding direction of the forward braided layer and the axial direction of the spiral pipe is +55°, the included angle between the braiding direction of the reverse braided layer and the axial direction of the spiral pipe is -55°, and the included angle between the braiding direction of the anti-abrasion isolation layer and the axial direction of the spiral pipe is -30°.

[0009] As an improvement, an annular flange for abutting against the end portion of the connecting seat is arranged on the outer wall of the connecting head; by adopting the structure, the axial limiting of the connecting head and the connecting seat during connection is realized by the annular flange.

[0010] As an improvement, a sealing ring is arranged on the annular flange and away from one end of the spiral pipe; by adopting the structure, the sealing performance during the connection between the spiral pipe assemblies is enhanced.

[0011] As an improvement, the connecting portions are arranged at both ends of the spiral pipe, the limiting grooves are arranged on the outer circumferential wall of the connecting portions in the circumferential direction, the annular grooves for accommodating the connecting portions are arranged on the end faces of the connecting head and the connecting seat and close to the spiral pipe, and the two ends of the spiral pipe are connected with the connecting head and the connecting seat through pressure connection; by adopting the structure, when the connecting portions are pressure connected with the connecting head and the connecting seat, the connecting head and the connecting seat are deformed and clamped into the limiting grooves, the tensile capacity between the spiral pipe and the connecting head and the connecting seat is improved, and the sealing performance is also achieved.

[0012] As an improvement, the limiting grooves are in a spiral shape; by adopting the structure, the tensile capacity between the spiral pipe and the connecting head and the connecting seat is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a sectional view of the utility model.

[0014] Figure 2 It is Figure 1 It is a local enlarged view of A part in the middle.

[0015] Reference numerals: 1. Spiral tube; 2. Metal connecting assembly; 21. Connector; 22. Connecting seat; 3. Steel wire reinforcement layer; 31. Forward braided layer; 32. Reverse braided layer; 33. Wear-resistant isolation layer; 4. Spiral groove; 5. Annular flange; 6. Sealing ring; 7. Connecting part; 8. Limiting groove; 9. Annular groove. Detailed Implementation

[0016] The following is a detailed description of a steel wire reinforced polytetrafluoroethylene spiral tube assembly according to the present invention, with reference to the accompanying drawings.

[0017] like Figures 1 to 2 As shown, a steel wire reinforced polytetrafluoroethylene spiral tube assembly includes a spiral tube 1, a metal connecting assembly 2, and a steel wire reinforcement layer 3. The spiral tube 1 is made of polytetrafluoroethylene, and the outer wall of the spiral tube 1 is provided with a spiral groove 4. The steel wire reinforcement layer 3 is a mesh structure formed by several steel wires being woven together, and the steel wire reinforcement layer 3 covers the outer wall of the spiral tube 1.

[0018] Specifically, the steel wire reinforcement layer 3 includes a forward braided layer 31, a reverse braided layer 32, and an anti-wear isolation layer 33. The forward braided layer 31 is disposed on the outer surface of the reverse braided layer 32. The braiding directions of the forward braided layer 31 and the reverse braided layer 32 are opposite. That is, the angle of the forward braided layer 31 is +θ, and the angle of the reverse braided layer 32 is -θ. This allows the tensile components of the two steel wire layers, the forward braided layer 31 and the reverse braided layer 32, to be superimposed in the axial and radial directions. The bidirectional tensile design effectively disperses axial and radial stresses and improves dynamic bending performance. The opposite directions of adjacent braided layers reduce the risk of fatigue fracture of the steel wire reinforcement layer 3 due to repeated bending.

[0019] The abrasion-resistant isolation layer 33 is composed of cross-woven aramid fibers. The weaving direction of the abrasion-resistant isolation layer 33 forms an angle with both the forward weaving layer 31 and the reverse weaving layer 32. In this embodiment, the weaving direction of the forward weaving layer 31 forms an angle of +55° with the axial direction of the spiral tube 1, the weaving direction of the reverse weaving layer 32 forms an angle of -55° with the axial direction of the spiral tube 1, and the weaving direction of the abrasion-resistant isolation layer 33 forms an angle of -30° with the axial direction of the spiral tube 1, so that its fiber orientation interweaves with the steel wire layer, achieving physical bonding through geometric nesting.

[0020] In addition, for the connection between the wear-resistant isolation layer 33 and the forward braided layer 31 and the reverse braided layer 32, polytetrafluoroethylene powder is pre-coated on the surface of the aramid fiber. The powder is melted by hot pressing and forms a fusion bonding interface with the polytetrafluoroethylene body of the forward braided layer 31 and the reverse braided layer 32 to avoid the risk of delamination.

[0021] For the connection between the reverse braid layer 32 and the spiral pipe 1, the same can be achieved by coating the reverse braid layer 32 with a polytetrafluoroethylene coating, and the coating melts with the polytetrafluoroethylene material of the outer wall of the spiral pipe 1 during the sintering process, forming a continuous bonding layer without interface difference.

[0022] As shown in Figure 1 The metal connecting assembly 2 comprises a connecting head 21 and a connecting seat 22, and the connecting head 21 and the connecting seat 22 are connected to the two ends of the spiral pipe 1 respectively. Both the connecting head 21 and the connecting seat 22 are tubular structures, and the outer wall of the connecting head 21 is provided with external threads, and the inner wall of the connecting seat 22 is provided with internal threads for connecting with the external threads.

[0023] As shown in Figure 1 The outer wall of the connecting head 21 is provided with an annular flange 5 for abutting against the end of the connecting seat 22, and the annular flange 5 is provided with a sealing ring 6 away from one end of the spiral pipe 1. When the connecting head 21 is connected with the connecting seat 22, the sealing ring 6 is located between the annular flange 5 and the end of the connecting seat 22, and plays a sealing role.

[0024] As shown in Figure 1 and Figure 2 Both ends of the spiral pipe 1 are provided with connecting parts 7, and the outer peripheral wall of the connecting part 7 is provided with a limiting groove 8 in the circumferential direction. The end face of the connecting head 21 and the connecting seat 22 close to the spiral pipe 1 is provided with an annular groove 9 for accommodating the connecting part 7. Both ends of the spiral pipe 1 are connected with the connecting head 21 and the connecting seat 22 through crimping. When the connecting part 7 is crimped with the connecting head 21 and the connecting seat 22, the connecting head 21 and the connecting seat 22 are deformed and clamped into the limiting groove 8, which improves the tensile strength between the spiral pipe 1 and the connecting head 21 and the connecting seat 22, and has a certain sealing performance. In the embodiment, the limiting groove 8 is spiral-shaped.

[0025] In the utility model, the spiral pipe 1 made of polytetrafluoroethylene is provided with a spiral groove 4 on the outer wall. The spiral groove 4 cooperates with the steel wire reinforcing layer 3 to keep the spiral pipe assembly stable in shape under repeated bending conditions, so that the spiral pipe assembly has good deflection performance. The spiral groove 4 and the steel wire reinforcing layer 3 work together to form balanced load bearing characteristics of axial tensile and radial compression, improve the overall strength of the spiral pipe assembly, and the connecting head 21 and the connecting seat 22 are convenient for connecting the spiral pipe assemblies and connecting the spiral pipe assemblies with other aviation components.

[0026] The above describes the embodiments of the utility model in detail in combination with the drawings, but the utility model is not limited to the above-mentioned one embodiment, and all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

Claims

1. A steel wire reinforced polytetrafluoroethylene helical tube assembly, characterized by, The application relates to a spiral pipe (1), a metal connecting assembly (2) and a steel wire reinforcing layer (3), wherein the spiral pipe (1) is made of polytetrafluoroethylene, the outer wall of the spiral pipe (1) is provided with a spiral groove (4), the steel wire reinforcing layer (3) is a net-shaped structure formed by crossing and weaving a plurality of steel wires, the steel wire reinforcing layer (3) is coated on the outer wall of the spiral pipe (1), the metal connecting assembly (2) comprises a connecting head (21) and a connecting seat (22), the connecting head (21) and the connecting seat (22) are connected to the two ends of the spiral pipe (1) respectively, the connecting head (21) and the connecting seat (22) are both in tubular structures, the outer wall of the connecting head (21) is provided with external threads, and the inner wall of the connecting seat (22) is provided with internal threads used for being connected with the external threads.

2. The steel wire reinforced polytetrafluoroethylene spiral pipe assembly according to claim 1, characterized by, The steel wire reinforcing layer (3) comprises a forward weaving layer (31) and a reverse weaving layer (32), the forward weaving layer (31) is arranged on the outer surface of the reverse weaving layer (32), and the weaving directions of the forward weaving layer (31) and the reverse weaving layer (32) are opposite.

3. The steel cord reinforced polytetrafluoroethylene spiral pipe assembly according to claim 2, characterized in that, The steel wire reinforcing layer (3) further comprises an anti-abrasion isolation layer (33) which is composed of crossed and woven aramid fibers, and the weaving direction of the anti-abrasion isolation layer (33) has an included angle with the weaving directions of the forward weaving layer (31) and the reverse weaving layer (32).

4. The steel cord reinforced polytetrafluoroethylene spiral pipe assembly according to claim 3, characterized in that, The included angle between the weaving direction of the forward weaving layer (31) and the axial direction of the spiral pipe (1) is +55 degrees, the included angle between the weaving direction of the reverse weaving layer (32) and the axial direction of the spiral pipe (1) is -55 degrees, and the included angle between the weaving direction of the anti-abrasion isolation layer (33) and the axial direction of the spiral pipe (1) is -30 degrees.

5. The steel cord reinforced polytetrafluoroethylene spiral pipe assembly according to claim 1, characterized in that, The outer wall of the connecting head (21) is provided with an annular flange (5) used for abutting against the end of the connecting seat (22).

6. The steel cord reinforced polytetrafluoroethylene spiral pipe assembly according to claim 5, characterized in that One end of the annular flange (5) away from the spiral pipe (1) is provided with a sealing ring (6).

7. The steel cord reinforced polytetrafluoroethylene spiral pipe assembly according to claim 1, characterized in that, The two ends of the spiral pipe (1) are provided with connecting portions (7), the outer circumferential wall of the connecting portion (7) is provided with a limiting groove (8) in the circumferential direction, the end face of the connecting head (21) and the connecting seat (22) close to the spiral pipe (1) is provided with an annular groove (9) used for containing the connecting portion (7), and the two ends of the spiral pipe (1) and the connecting head (21) and the connecting seat (22) are connected through pressure connection.

8. The steel wire reinforced polytetrafluoroethylene spiral pipe assembly according to claim 7, characterized by The limiting groove (8) is in a spiral shape.

Images