High-pressure-resistant double-layer structure PPH composite pipe

Abstract

The utility model discloses a high pressure resistant double-layer structure PPH composite pipe relates to PPH composite pipe technical field, including inner pipe and outer pipe, the inner pipe is coaxially nested in the outer pipe to form the double-layer structure, and the annular clearance space is formed between the inner pipe and the outer pipe, the inner wall of the inner pipe is fixedly embedded with a mesh metal net, and the outer pipe is fixedly embedded with the mesh metal net. Metal net-shaped ribs are fixedly installed on the outer wall of the inner pipe, the metal net-shaped ribs are sleeved with annular protruding ribs, the outer wall of the outer pipe is fixedly sleeved with an annular nesting sleeve, a cavity is formed in the annular nesting sleeve, and elastic rubber balls are evenly distributed in the cavity at equal intervals in an array mode. The inner pipe and the outer pipe are coaxially nested to form a double-layer structure, and the annular gap space between the inner pipe and the outer pipe is supported by the rigid framework of the metal mesh ribs and the annular convex ribs, so that when the pipe bears internal pressure, the outer pipe can share part of radial load, stress concentration caused by a single-layer structure of the inner pipe is avoided, and the service life of the pipe is prolonged. And the high-pressure resistance of the pipe is obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to PPH composite pipe technical field, concretely relates to a high pressure resistant double -layer structure PPH composite pipe. BACKGROUND

[0002] PPH composite pipe is a high performance pipe made of ordinary polypropylene (PP) material after beta modification treatment, and through modification, PPH composite pipe forms uniform and delicate beta crystal structure, and excellent chemical corrosion resistance, high temperature resistance, aging resistance and mechanical strength are endowed.

[0003] The existing PPH composite pipe does not have high pressure resistance, for example, the anti -pressure PPH modified pipe of CN219588304U is disclosed, although the inner support net rack and support ring are arranged to enhance the pressure resistance of the PPH pipe body in the patent, but the pipe is still a single layer structure, although the pressure resistance is enhanced through the inner support net rack and support ring, but under the extreme high pressure working condition, the single layer pipe may still fail due to stress concentration or local deformation, and the internal pressure load cannot be fully dispersed, and for dynamic impact working conditions such as high speed fluid or sand containing fluid, the pipe inner wall may be abraded or cracked due to direct fluid impact, and there is no effective impact force dispersion mechanism.

[0004] Therefore, it is necessary to invent a high pressure resistant double layer structure PPH composite pipe to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model discloses a high pressure resistant double layer structure PPH composite pipe, solve the problem of not having high pressure resistance, and the internal pressure load cannot be fully dispersed, and the pipe is abraded or cracked due to direct fluid impact.

[0006] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: a high pressure resistant double layer structure PPH composite pipe, including the inner tube and the outer tube, the inner tube is coaxially nested in the outer tube and forms a double layer structure, and the annular gap space is formed between the two, the inner wall of the inner tube is fixedly embedded with the grid metal net, the outer wall of the inner tube is fixedly installed with the metal net shape muscle, the outer part of the metal net shape muscle is equipped with the annular convex muscle, the outer wall of the outer tube is fixedly equipped with the annular nest, the inside of the annular nest is equipped with the cavity, and the inside of the cavity is evenly distributed with the elastic rubber ball body.

[0007] Preferably, the outer surface of the grid metal net is coated with a first anticorrosive layer, the first anticorrosive layer adopts a polytetrafluoroethylene coating with a thickness of 0.2-0.3mm, which avoids wear or cracks on the inner wall due to long-term erosion.

[0008] Preferably, the mesh metal net adopts 316L stainless steel material, and is formed into a composite layer with the inner tube through a hot melting process, the mesh metal net is used as an embedded reinforcing body, and an overall structure is formed through hot melting and the inner tube, so that the burst pressure of the pipe is significantly improved.

[0009] Preferably, the metal mesh rib is fixed and installed along the outer wall of the inner tube in the axial direction, and constitutes a radial reinforcing structure, the metal mesh rib is close to the inner wall of the outer tube, and constitutes a radial reinforcing structure, and the grid frame formed by the high-strength metal wire significantly improves the ability of the inner tube to resist radial deformation.

[0010] Preferably, the metal mesh rib and the annular protruding rib are fixedly connected in a hot melting mode to form a rigid framework to stably support the annular nesting.

[0011] Preferably, the outer wall of the outer tube is coated with a second anticorrosion layer, the second anticorrosion layer also adopts a polytetrafluoroethylene coating, and the thickness is 0.2-0.3 mm, so that the anticorrosion performance of the outer tube is improved, and protection is provided against soil corrosion, ultraviolet aging, mechanical scratching and the like.

[0012] Preferably, the elastic rubber sphere is made of nitrile rubber material to form a recoverable elastic support layer to reduce the impact load between the inner tube and the outer tube.

[0013] In the above technical solution, the technical effects and advantages of the utility model are provided:

[0014] 1. The utility model discloses a double-layer structure formed by the coaxial nesting of the inner tube and the outer tube, and the annular gap space between the inner tube and the outer tube is supported by the rigid framework of the metal mesh rib and the annular protruding rib, so that when the pipe bears internal pressure, the outer tube can share part of the radial load, stress concentration of the inner tube caused by the single-layer structure is avoided, and the high-pressure resistance of the pipe is significantly improved.

[0015] 2. The utility model discloses that the elastic support layer is formed by the equidistant distribution of the nitrile rubber sphere in the cavity of the annular nesting, when the internal pressure fluctuates, the sphere absorbs energy through elastic deformation, reduces the impact load between the inner tube and the outer tube, and avoids fatigue failure. DRAWINGS

[0016] Figure 1 It is a whole structure schematic view of the utility model;

[0017] Figure 2 It is a sectional view of the inner tube of the utility model;

[0018] Figure 3 It is a sectional view of the mesh metal net and the first anticorrosion layer of the utility model;

[0019] Figure 4The metal net-shaped rib and the annular nesting three-dimensional structure schematic diagram of the utility model;

[0020] Figure 5 The annular nesting cross section three-dimensional structure schematic diagram of the utility model.

[0021] Mark explanation:

[0022] 1, inner tube; 2, outer tube; 3, grid metal net; 4, No. 1 anticorrosive layer; 5, metal net-shaped rib; 6, annular convex rib; 7, annular nesting; 8, No. 2 anticorrosive layer; 9, cavity; 10, elastic rubber sphere. Specific implementation

[0023] In order to make the technical personnel of the prior art better understand the technical scheme of the utility model, the utility model will be further introduced in detail below in conjunction with the drawings.

[0024] The utility model provides a kind of high-pressure-resistant double-layer structure PPH composite pipe as shown in Figures 1-5 It includes inner tube 1 and outer tube 2, and inner tube 1 is coaxially nested in outer tube 2 to form a double-layer structure, forming an annular gap space between the two, and the inner wall of inner tube 1 is fixedly embedded with a grid metal net 3. The outer surface of the grid metal net 3 is coated with a No. 1 anticorrosive layer 4. The No. 1 anticorrosive layer 4 is made of a polytetrafluoroethylene coating with a thickness of 0.2-0.3mm. The grid metal net 3 is made of 316L stainless steel material and forms a composite layer with inner tube 1 through a hot melting process. A metal net-shaped rib 5 is fixedly installed on the outer wall of inner tube 1. The metal net-shaped rib 5 is externally sleeved with an annular convex rib 6. The metal net-shaped rib 5 is fixedly installed along the axial direction of the outer wall of inner tube 1 to form a radial reinforcing structure. The metal net-shaped rib 5 is in close contact with the inner wall of outer tube 2. The metal net-shaped rib 5 and the annular convex rib 6 are fixedly connected in a hot melting manner.

[0025] In this embodiment, the annular gap space is supported by the metal net-shaped rib 5 and the annular convex rib 6 to avoid direct contact between inner tube 1 and outer tube 2. When the pipe is subjected to internal pressure, the radial expansion of inner tube 1 is buffered by the annular gap space. Outer tube 2 shares part of the load through the metal net-shaped rib 5 to avoid stress concentration caused by the single-layer structure of inner tube 1. The fluid impact force can be dispersed to reduce the local deformation of inner tube 1. Crack propagation caused by stress concentration is avoided. The No. 1 anticorrosive layer 4 can effectively resist the erosion and corrosion of the conveying medium such as sand-containing fluid, strong acid and strong base to prolong the service life of inner tube 1.

[0026] The outer wall of outer tube 2 is fixedly sleeved with an annular nesting 7. The annular nesting 7 has a cavity 9 formed in the inside. The cavity 9 is uniformly and equidistantly arrayed with elastic rubber spheres 10 made of nitrile rubber material. The outer wall of outer tube 2 is coated with a No. 2 anticorrosive layer 8. The No. 2 anticorrosive layer 8 is also made of a polytetrafluoroethylene coating with a thickness of 0.2-0.3mm.

[0027] The combination of the cavity 9 of the annular nest 7 and the elastic rubber sphere 10 in the embodiment can absorb thermal expansion displacement, avoid rigid friction between the outer pipe 2 and the soil or the fixed support, prolong the service life of the pipe material, the elastic rubber sphere 10 absorbs impact energy through compression deformation, reduces stress concentration of the outer pipe 2, and the polytetrafluoroethylene PTFE coating is evenly covered on the outer wall of the outer pipe 2 through the electrostatic spraying process The second anticorrosive layer 8 can effectively block the penetration of corrosive media, improve the characteristics of chemical corrosion resistance, ultraviolet aging resistance, microbial erosion resistance and low friction resistance, and ensure the long-term stability of the outer pipe 2 in complex environments.

[0028] The working principle of the utility model is as follows:

[0029] Referring to the drawings in the specification Figures 1-5 When using the utility model, first, when the pipe material bears internal pressure, the inner pipe 1 expands radially due to fluid pressure, and the annular gap space absorbs part of the expansion through elastic deformation, reducing the radial deformation of the inner pipe 1, at the same time, the outer pipe 2 is rigidly connected with the inner pipe 1 through the metal mesh rib 5, and shares part of the internal pressure load, avoiding stress concentration caused by the single-layer structure of the inner pipe 1, and the grid metal mesh 3 is embedded in the inner wall of the inner pipe 1, and forms a composite layer with the inner pipe 1 through a hot melting process, and the grid structure can disperse the fluid impact force to the entire surface of the inner pipe 1, avoiding local stress concentration, when conveying medium such as sand-containing fluid and high-speed fluid impacts the inner pipe 1, the high-strength characteristics of the grid metal mesh 3 can effectively absorb impact energy, reduce the local deformation of the inner pipe 1, thereby inhibiting the generation and expansion of cracks, and the polytetrafluoroethylene PTFE first anticorrosive layer 4 coated on the outer surface of the grid metal mesh 3 has extremely low friction coefficient and excellent chemical inertness, which can effectively resist the erosion and corrosion of the conveying medium.

[0030] The elastic rubber spheres 10 uniformly distributed in the inner cavity 9 of the annular nest 7 absorb thermal expansion displacement through compression deformation, when the pipe material expands due to temperature change, the elastic deformation of the elastic rubber spheres 10 can compensate for the size change of the inner pipe 1 and the outer pipe 2, avoid rigid friction between the outer pipe 2 and the soil or the fixed support, reduce structural damage caused by thermal stress, at the same time, when the pipe material is impacted by external force such as earthquake wave and mechanical vibration, the elastic rubber spheres 10 can absorb impact energy through compression deformation, reduce stress concentration of the outer pipe 2, reduce the risk of fatigue damage, and the second anticorrosive layer 8 provides the characteristics of chemical corrosion resistance, ultraviolet aging resistance, microbial erosion resistance and low friction resistance, and ensures the long-term stability of the outer pipe 2 in complex environments.

[0031] It is to be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0032] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made therein without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure resistant double-layer PPH composite pipe, comprising an inner pipe (1) and an outer pipe (2), characterized in that: The inner tube (1) is coaxially nested inside the outer tube (2) to form a double-layer structure, with an annular gap space between them. The inner wall of the inner tube (1) is fixedly embedded with a mesh metal mesh (3), and the outer wall of the inner tube (1) is fixedly installed with a metal mesh rib (5). The metal mesh rib (5) is sleeved with an annular protruding rib (6). The outer wall of the outer tube (2) is fixedly sleeved with an annular nest (7). The annular nest (7) has a cavity (9) inside, and elastic rubber spheres (10) are evenly distributed in an array at equal intervals inside the cavity (9).

2. The high-pressure resistant double-layer PPH composite pipe according to claim 1, characterized in that: The outer surface of the mesh metal mesh (3) is coated with a first anti-corrosion layer (4), which is a polytetrafluoroethylene coating with a thickness of 0.2-0.3 mm.

3. The high-pressure resistant double-layer PPH composite pipe according to claim 2, characterized in that: The mesh metal mesh (3) is made of 316L stainless steel and forms a composite layer with the inner tube (1) through a hot-melt process.

4. The high-pressure resistant double-layer PPH composite pipe according to claim 1, characterized in that: The metal mesh reinforcement (5) is fixedly installed axially along the outer wall of the inner tube (1) to form a radially reinforced structure. The metal mesh reinforcement (5) is tightly attached to the inner wall of the outer tube (2).

5. The high-pressure resistant double-layer PPH composite pipe according to claim 1, characterized in that: The metal mesh ribs (5) and the annular protruding ribs (6) are fixedly connected by heat fusion.

6. The high-pressure resistant double-layer PPH composite pipe according to claim 2, characterized in that: The outer wall of the outer tube (2) is coated with a second anti-corrosion layer (8), which is also made of polytetrafluoroethylene coating with a thickness of 0.2-0.3 mm.

7. The high-pressure resistant double-layer PPH composite pipe according to claim 2, characterized in that: The elastic rubber sphere (10) is made of nitrile rubber.

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