High-pressure-resistant plastic pipe

Abstract

The high-pressure-resistant plastic pipe comprises a pipe body, the pipe body is sequentially provided with a flow guide layer, a buffer layer, a reinforcing layer and a protective layer from inside to outside, protrusions used for flow guide are integrally formed on the inner wall of the flow guide layer, and flow dividing cavities are formed in the protrusions at intervals. And a water inlet and a water outlet are respectively formed in the bulge and correspond to the shunting cavity. Through the collaborative design of the flow guide layer, the buffer layer, the enhancement layer and the protection layer, step-by-step dissolution of pressure and efficient regulation of water flow are achieved, protrusions of the flow guide layer are matched with the flow dividing cavities, water flow impact is weakened, turbulent flow is avoided, stepped absorption of the pressure is achieved through the gradient honeycomb structure of the buffer layer, and the flow dividing effect is improved. The three-dimensional stress network of the reinforcing layer disperses residual pressure, finally, the risk of local stress concentration of the pipe body is greatly reduced, compared with a traditional single-structure pipe, the operation stability under the high-pressure working condition is remarkably improved, and the problems of cracking and leakage caused by pressure overload are effectively avoided.

Description

Technical Field

[0001] This utility model relates to the field of plastic pipe technology, and more specifically, to a high-pressure resistant plastic pipe. Background Technology

[0002] In various scenarios such as municipal water supply, industrial fluid transportation, and building water supply and drainage, water flow in pipelines is often accompanied by pressure fluctuations and instantaneous impact pressures (such as water hammer). Especially under high-pressure fluid transportation conditions, pipe materials need to possess excellent pressure resistance, impact resistance, and long-term structural stability to avoid problems such as leakage and cracking, and to ensure the safety and continuity of fluid transportation. As various projects continue to increase their requirements for fluid transportation pressure and flow rate, the market's demand for the comprehensive performance of high-pressure resistant plastic pipes is becoming increasingly stringent.

[0003] In existing technologies, common methods to improve the high-pressure resistance of plastic pipes include increasing the overall wall thickness, using multi-layer composite structures, adding reinforcing fillers to the pipe raw materials, or setting simple reinforcement structures on the pipe wall surface. While increasing the pipe wall thickness can improve pressure resistance to some extent, it leads to a significant increase in material consumption and production costs, while also increasing the pipe's weight, causing inconvenience in transportation and installation. Multi-layer composite pipes generally suffer from insufficient interlayer bonding strength, making them prone to peeling and delamination under long-term high-pressure fluid impact, thus affecting the overall pressure resistance of the pipe. Adding reinforcing fillers can improve pipe rigidity, but it reduces toughness, decreasing its impact resistance and making it susceptible to localized damage under instantaneous pressure impact. Simple pipe wall reinforcement structures are insufficient to effectively disperse the instantaneous pressure and radial stress generated by water flow within the pipe, easily leading to localized pressure concentration during water transmission, which not only exacerbates pipe wall wear but also shortens the pipe's service life.

[0004] In practical use, existing high-pressure resistant plastic pipes still have certain problems: on the one hand, they cannot simultaneously meet the requirements of pressure resistance and lightweighting. Either the pressure resistance meets the standards but the cost is too high and the construction is inconvenient, or the cost is low but it is difficult to withstand long-term high-pressure conditions. On the other hand, they have poor pressure dispersion effect on water flow impact, and the turbulence phenomenon when water flows through the pipe is obvious, which further aggravates the pressure concentration problem. This makes the pipe material prone to cracking and aging in weak parts, which seriously affects the stability and safety of fluid transportation. Therefore, we urgently need a high-pressure resistant plastic pipe to solve the above problems. Utility Model Content

[0005] One objective of this invention is to provide a new technical solution for high-pressure resistant plastic pipes. Through a multi-layered synergistic structure consisting of a flow-guiding layer for pressure relief, a buffer layer for gradient energy absorption, a reinforcing layer for three-dimensional stress dispersion, and a protective layer for isolation and protection, the pipe body's high-pressure resistance is improved, interlayer leakage and structural deformation are avoided, service life is extended, and it is suitable for high-pressure fluid transmission in various scenarios.

[0006] According to a first aspect of the present invention, a high-pressure resistant plastic pipe is provided, comprising a pipe body, wherein the pipe body is provided with a flow guiding layer, a buffer layer, a reinforcing layer and a protective layer in sequence from the inside to the outside; the inner wall of the flow guiding layer has integrally formed protrusions for flow guiding; the protrusions are intermittently provided with flow diversion cavities; the protrusions and corresponding flow diversion cavities are respectively provided with inlet and outlet; and the inner wall of the flow guiding layer is provided with guide grooves for flow guiding.

[0007] Optionally, the number of protrusions is at least six groups, and the six groups of protrusions are arranged equidistantly in a ring on the inner wall of the flow guide layer, with the guide groove disposed between two adjacent groups of protrusions.

[0008] Optionally, the cross-section of the protrusion is trapezoidal.

[0009] Optionally, the buffer layer is provided with a first buffer, a second buffer and a third buffer in a radially distributed manner, wherein the first buffer is connected to the outer wall of the flow guiding layer and the third buffer is connected to the inner wall of the reinforcement layer.

[0010] Optionally, the first buffer, the second buffer, and the third buffer are all configured with hexagonal honeycomb holes.

[0011] Optionally, the cell density of the first buffer, the second buffer, and the third buffer decreases radially in a stepwise manner.

[0012] Optionally, the first buffer, the second buffer, and the third buffer are all made of PEEKK and glass fiber composite foam material.

[0013] Optionally, the reinforcing layer consists of annular main ribs and supporting skeletons for connecting the annular main ribs. There are multiple sets of annular main ribs, which are arranged linearly and equidistantly along the axis of the tube. There are also multiple sets of supporting skeletons, which are arranged annularly and equidistantly on the annular main ribs.

[0014] Optionally, the inner wall of the protective layer is connected to the supporting frame and the annular main rib.

[0015] Optionally, the gaps between the annular main rib and the supporting frame are filled with a high-density filler.

[0016] 1. According to one embodiment of this disclosure, the high-pressure resistant plastic pipe achieves stepwise pressure reduction and efficient water flow regulation through the synergistic design of a flow guiding layer, a buffer layer, a reinforcing layer, and a protective layer. The protrusions of the flow guiding layer cooperate with the flow distribution cavity to weaken the impact of water flow and avoid the generation of turbulence. The gradient honeycomb structure of the buffer layer achieves stepwise pressure absorption. The three-dimensional stress network of the reinforcing layer disperses residual pressure, ultimately greatly reducing the risk of local stress concentration in the pipe body. Compared with traditional single-structure pipes, it significantly improves the operational stability under high-pressure conditions and effectively avoids cracking and leakage problems caused by pressure overload.

[0017] 2. According to one embodiment of this disclosure, the high-pressure resistant plastic pipe, through an integrated molding process and a tightly bonded design between layers, ensures that there are no splicing gaps between the layers. This not only improves the overall sealing performance and structural integrity of the pipe body, but also avoids the risk of interlayer delamination. At the same time, the direct connection between the protective layer and the core load-bearing structure of the reinforcing layer not only forms a collaborative pressure-bearing system to enhance pressure resistance, but also isolates the pipe body from external friction, corrosion and other environmental influences, extending the service life of the pipe body. Furthermore, the pipe body has a regular appearance and can be adapted to various existing pipe fitting interfaces, reducing the construction and use threshold and improving the adaptability to all application scenarios.

[0018] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0020] Figure 1 This is a schematic diagram of the overall structure of a high-pressure resistant plastic pipe in one embodiment;

[0021] Figure 2 This is a front view structural diagram of a high-pressure resistant plastic pipe in one embodiment;

[0022] Figure 3 This is a schematic diagram of a half-section of a high-pressure resistant plastic pipe in one embodiment;

[0023] Figure 4 This is a cross-sectional view of a high-pressure resistant plastic pipe in one embodiment.

[0024] The diagram shows: 1. Pipe body; 2. Guide layer;

[0025] 3. Buffer layer; 31. First buffer layer; 32. Second buffer layer; 33. Third buffer layer;

[0026] 4. Reinforcing layer; 41. Annular main rib; 42. Supporting skeleton; 43. High-density filler;

[0027] 5. Protective layer; 6. Protrusion; 7. Diversion cavity; 8. Inlet; 9. Outlet; 10. Guide groove. Detailed Implementation

[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0029] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0031] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0032] like Figure 1 and 4 As shown, a high-pressure resistant plastic pipe includes a pipe body 1, which is provided with a flow guiding layer 2, a buffer layer 3, a reinforcing layer 4 and a protective layer 5 from the inside to the outside.

[0033] Here, the four layers of pipe body 1 are stacked radially and tightly fitted together to form a complete integrated composite structure. This arrangement allows each layer to precisely receive and transfer the function of the layer above: the flow guiding layer 2 is responsible for regulating water flow, the buffer layer 3 provides pressure buffering, the reinforcing layer 4 provides structural support, and the protective layer 5 provides external protection. The four layers work together to form a closed loop, effectively solving the technical challenge of traditional single-structure pipes being unable to simultaneously meet the multiple requirements of flow guiding, pressure resistance, and protection.

[0034] In addition, the four-layer structure adopts a synchronous molding process with no seams between the layers. This not only prevents high-pressure water from leaking between the layers, but also ensures that the stress can be evenly transmitted, avoiding local stress concentration caused by the gaps between the layers. This lays a solid foundation for the overall high-pressure resistance of the pipe body 1.

[0035] The inner wall of the flow guiding layer 2 is integrally formed with protrusions 6 for flow guiding. There are at least six sets of protrusions 6, which are arranged in a ring at equal intervals on the inner wall of the flow guiding layer 2. The guide groove 10 is disposed between two adjacent sets of protrusions 6.

[0036] Here, the protrusion 6 and the guide layer 2 are integrally molded to form a complete whole, with excellent structural stability. Even under long-term continuous impact and scouring of high-pressure water flow, it can effectively prevent problems such as protrusion 6 falling off or deforming. At the same time, at least six sets of annularly arranged protrusions 6 evenly divide the inner cavity of the pipe body 1 into six or more independent guide areas, so that the disordered water flow is confined within a preset range, avoiding its concentrated impact on the local pipe wall, and significantly reducing the local wear and pressure load on the pipe wall.

[0037] Furthermore, the guide grooves 10 located between adjacent protrusions 6 form a regular flow channel that matches the number of protrusions 6. The water flow is smoothly transmitted along the guide grooves 10, which can suppress the generation of chaotic turbulence, reduce pressure loss during water transmission, and reduce the additional impact of turbulence on the pipe wall.

[0038] The protrusion 6 has intermittently opened diversion chambers 7. The protrusion 6 has an inlet 8 and an outlet 9 respectively, corresponding to the diversion chambers 7. The inner wall of the flow guiding layer 2 has a guide groove 10 for guiding the flow. The cross section of the protrusion 6 is trapezoidal.

[0039] Here, the diversion chamber 7 is intermittently arranged, that is, spaced out along the length of the protrusion 6. This design achieves the function of diversion and pressure relief while maintaining the overall structural strength of the protrusion 6, avoiding the failure of the guiding and supporting functions caused by a completely hollow structure. The inlet 8 and the outlet 9 constitute the water flow channel of the diversion chamber 7. When part of the high-pressure water flow enters the diversion chamber 7 from the inlet 8, its impact kinetic energy is buffered and absorbed by the chamber wall, resulting in a significant decrease in water flow velocity, and finally flowing out smoothly from the outlet 9, thereby effectively weakening the direct impact force on the pipe wall. At the same time, the trapezoidal cross-section of the protrusion 6 makes its lower bottom (the end connected to the inner wall of the guide layer 2) wider, increasing the connection area and improving the uniformity of stress and structural stability; its upper bottom (facing the center end of the pipe body 1) is narrower, reducing obstruction to the water flow and lowering the water flow transmission resistance.

[0040] Furthermore, the guide groove 10, together with the protrusion 6 and the diversion cavity 7, forms a dual system of "main channel flow guidance and diversion cavity 7 pressure relief". While the water flows smoothly in the main channel, some of the high-pressure water flows through the diversion cavity 7 for pressure relief, effectively solving the problem of uneven pressure distribution in the pipe and making the force on the guide layer 2 more uniform.

[0041] The buffer layer 3 is provided with a first buffer 31, a second buffer 32 and a third buffer 33 distributed radially. The first buffer 31 is connected to the outer wall of the flow guiding layer 2 and the third buffer 33 is connected to the inner wall of the reinforcement layer 4.

[0042] Here, the three buffer zones of buffer layer 3 are arranged sequentially from the inside out, forming a continuous buffer structure. The first buffer zone 31, which is adjacent to the flow guide layer 2, can immediately receive the pressure transmitted by it; the second buffer zone 32 is located in the middle and plays a transitional role; the third buffer zone 33, which is close to the reinforcement layer 4, smoothly transmits the residual pressure after buffering. This "inner support-transfer-outer transmission" design realizes the gradual reduction of pressure within the buffer layer 3, preventing damage to the pipe wall structure from sudden pressure changes.

[0043] Furthermore, the three buffer zones are tightly fitted with the adjacent flow guide layer 2 and reinforcement layer 4 without any gaps. This ensures that the pressure is fully transmitted to the buffer layer 3 for depressurization, avoids local high pressure accumulation, and improves the tightness of the interlayer bonding, thereby enhancing the overall stability of the pipe body 1.

[0044] The first buffer zone 31, the second buffer zone 32, and the third buffer zone 33 are all configured with hexagonal honeycomb cells. The honeycomb cell density of the first buffer zone 31, the second buffer zone 32, and the third buffer zone 33 decreases radially in a stepped manner. The first buffer zone 31, the second buffer zone 32, and the third buffer zone 33 are all made of PEEKK and glass fiber composite foam material.

[0045] Here, all three buffer zones employ a hexagonal honeycomb structure with excellent pressure resistance. The pore walls support each other, which can evenly distribute surface pressure and efficiently absorb impact energy through elastic deformation. The honeycomb pore density decreases radially in a stepped manner, precisely matching the pressure gradient of the inner layer (high density) and outer layer (low density) of the tube body 1: the high-density honeycomb pores in the inner layer strongly withstand high-pressure impacts, while the low-density honeycomb pores in the outer layer gently release residual pressure, achieving a precise match between buffering effect and pressure changes.

[0046] Furthermore, the material is a composite foam of PEEKK and glass fiber. PEEKK itself has excellent properties of resistance to high temperature, high pressure and corrosion, and the addition of glass fiber further enhances the strength and rigidity of the material. The foaming process forms micropores inside the material, which, while maintaining high strength, gives it good elastic recovery performance and significantly reduces the weight of the buffer layer 3, avoiding the increased transportation and construction difficulties caused by the excessive thickness and weight of the pipe body 1.

[0047] The reinforcing layer 4 consists of annular main ribs 41 and supporting skeletons 42 for connecting the annular main ribs 41. There are multiple sets of annular main ribs 41, which are arranged linearly and equidistantly along the axis of the tube body 1. There are multiple sets of supporting skeletons 42, which are arranged annularly and equidistantly on the annular main ribs 41. The gaps between the annular main ribs 41 and the supporting skeletons 42 are filled with high-density filler 43.

[0048] Here, the annular main rib 41 is the core component of the reinforcing layer 4 to resist radial pressure. Multiple sets of annular main ribs 41, equidistantly arranged along the axis, form a pressure-resistant support system surrounding the pipe body 1, which can effectively resist the radial expansion force caused by the high pressure inside the pipe and prevent the pipe body 1 from expanding and deforming. Multiple sets of annularly arranged support frames 42 connect all the annular main ribs 41 into a complete three-dimensional force network, so that the pressure borne by a single set of annular main ribs 41 can be quickly transmitted and distributed to adjacent main ribs, avoiding single-point overload and realizing axial dispersion of pressure.

[0049] Furthermore, the high-density filler 43 completely fills all the gaps between the annular main rib 41 and the supporting frame 42, transforming the reinforcing layer 4 from a frame structure into a complete solid structure. This not only significantly improves the overall rigidity and compressive strength of the reinforcing layer 4, but also effectively prevents the intrusion of external dust, moisture, and other impurities, avoiding corrosion and aging within the gaps, extending its service life, and providing a flat connection base for the protective layer 5.

[0050] The inner wall of the protective layer 5 is connected to the supporting frame 42 and the annular main rib 41.

[0051] Here, the protective layer 5 is directly connected to the core load-bearing structure of the reinforcing layer 4, and can simultaneously bear and share the residual pressure transmitted by it, forming a "reinforcement-protection" collaborative load-bearing system, which improves the pressure resistance redundancy of the pipe body 1.

[0052] Furthermore, the protective layer 5 tightly wraps around the reinforcing layer 4, which can effectively isolate the internal structure from external environmental factors such as friction and corrosion, protect the buffer layer 3 and the flow guiding layer 2 from external damage, thereby extending the overall service life of the pipe body 1.

[0053] In this invention, when high-pressure water enters the pipe body 1, the flow guiding layer 2 first regulates the water flow and provides initial pressure relief. The annularly spaced protrusions 6 on its inner wall divide the pipe cavity into independent flow guiding areas, which, together with the guide groove 10, guide the water flow smoothly. Simultaneously, some of the high-pressure water enters the diversion chamber 7 through the inlet 8 on the protrusion 6. After the chamber wall absorbs the kinetic energy, it flows out smoothly from the outlet 9, effectively reducing the direct impact on the pipe wall. Subsequently, the residual pressure transmitted by the flow guiding layer 2 is absorbed step-by-step by the buffer layer 3: the first buffer zone 31 strongly supports the high pressure with high-density honeycomb pores, the second buffer zone 32 provides transitional pressure reduction, and the third buffer zone 33 smoothly releases the pressure with low-density honeycomb pores, achieving gradient pressure dissipation through the elastic deformation of the pore wall. Next, the buffered micro-pressure is transmitted to the reinforcing layer 4. Multiple sets of annular main ribs 41 resist radial expansion forces, the support frame 42 disperses the pressure axially throughout the entire three-dimensional network, and the high-density filler 43 within the gaps ensures structural integrity and uniform stress distribution. Finally, the protective layer 5, through its direct connection with the support frame 42 and the annular main rib 41, not only shares some of the residual pressure to achieve collaborative pressure bearing, but also isolates the pipe body 1 from damage caused by external friction and corrosion, thus ensuring the long-term stable operation of the pipe body 1 under high-pressure conditions.

[0054] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A high-pressure resistant plastic pipe, comprising a pipe body (1), characterized in that: The pipe body (1) is provided with a flow guiding layer (2), a buffer layer (3), a reinforcing layer (4) and a protective layer (5) from the inside to the outside. The inner wall of the flow guiding layer (2) is integrally formed with a protrusion (6) for flow guiding. The protrusion (6) is intermittently provided with a diversion cavity (7). The protrusion (6) and the diversion cavity (7) are respectively provided with an inlet (8) and an outlet (9) on the protrusion (6) and corresponding to the diversion cavity (7). The inner wall of the flow guiding layer (2) is provided with a guide groove (10) for flow guiding.

2. The high-pressure resistant plastic pipe according to claim 1, characterized in that: The number of protrusions (6) is at least six sets, and the six sets of protrusions (6) are arranged in a ring at equal intervals on the inner wall of the guide layer (2). The guide groove (10) is arranged between two adjacent sets of protrusions (6).

3. The high-pressure resistant plastic pipe according to claim 2, characterized in that: The cross-section of the protrusion (6) is trapezoidal.

4. The high-pressure resistant plastic pipe according to claim 1, characterized in that: The buffer layer (3) is provided with a first buffer (31), a second buffer (32) and a third buffer (33) distributed radially. The first buffer (31) is connected to the outer wall of the guide layer (2) and the third buffer (33) is connected to the inner wall of the reinforcement layer (4).

5. A high-pressure resistant plastic pipe according to claim 4, characterized in that: The first buffer (31), the second buffer (32) and the third buffer (33) are all configured with hexagonal honeycomb holes.

6. A high-pressure resistant plastic pipe according to claim 5, characterized in that: The cell density of the first buffer (31), the second buffer (32) and the third buffer (33) decreases radially in a stepwise manner.

7. A high-pressure resistant plastic pipe according to claim 6, characterized in that: The first buffer (31), the second buffer (32) and the third buffer (33) are all made of PEEKK and glass fiber composite foam material.

8. A high-pressure resistant plastic pipe according to claim 1, characterized in that: The reinforcing layer (4) consists of annular main ribs (41) and supporting skeletons (42) for connecting the annular main ribs (41). There are multiple sets of annular main ribs (41), which are arranged linearly and equidistantly along the axis of the tube body (1). There are multiple sets of supporting skeletons (42), which are arranged annularly and equidistantly on the annular main ribs (41).

9. A high-pressure resistant plastic pipe according to claim 8, characterized in that: The inner wall of the protective layer (5) is connected to the supporting frame (42) and the annular main rib (41).

10. A high-pressure resistant plastic pipe according to claim 9, characterized in that: The gap between the annular main rib (41) and the supporting skeleton (42) is filled with high-density filler (43).

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