Glass fiber reinforced plastic composite pipe with anti-deposition structure

Abstract

The application relates to the technical field of fluid conveying pipelines, in particular to an improved composite pipeline structure for conveying easily-settled solid particle medium, in particular to a glass fiber reinforced plastic composite pipeline with an anti-settling structure. The pipeline comprises a pipeline body and a flow guide unit integrated in the pipeline body; the flow guide unit is arranged on the inner wall of the pipeline body, that is, on the inner surface of the inner lining layer and extends along the pipeline axial direction. The unit is composed of at least one flow guide blade protruding from the inner wall of the pipeline to the central axis direction. Through the structural improvement, the application breaks the speed stratification of the fluid on the cross section of the pipeline by utilizing the cyclone effect, in particular eliminates the flow dead zone at the bottom of the pipeline, so that the solid particles are difficult to settle.

Description

Technical Field

[0001] This application relates to the field of fluid transport pipeline technology, and more specifically, to an improvement in the structure of a composite pipeline for transporting media containing easily settling solid particles, particularly a fiberglass composite pipeline with an anti-deposition structure. Background Technology

[0002] In the field of fluid transportation engineering, especially in industrial applications such as sewage treatment, mine tailings transportation, and chemical slurry transmission, fiberglass reinforced plastic (FRP) composite pipes are widely used due to their excellent corrosion resistance, light weight, high strength, and smooth inner wall. The media transported in these applications often contain solid particles or easily settled substances, posing a significant challenge to the long-term stable operation of the pipelines.

[0003] Currently, conventional fiberglass pipes widely used in the industry typically have smooth cylindrical inner walls. This structure offers low resistance and high efficiency when transporting homogeneous fluids. However, when the fluid medium contains a certain proportion of solid particles, under low flow velocity or laminar flow conditions, the solid particles gradually settle and accumulate at the bottom of the pipe because gravity is much greater than the suspending force provided by fluid turbulence. Over time, the deposit layer thickens, reducing the effective flow cross-sectional area and transport efficiency, eventually leading to pipe blockage and forcing the entire system to shut down for cleaning and maintenance. This blockage phenomenon is particularly prominent and frequent in pipeline systems involving long-distance transport and complex terrain (such as those with gentle slopes or U-bends). The root cause lies in the lack of a mechanism for actively disturbing the flow field and preventing particle settling in traditional smooth-walled pipes. The fluid velocity is higher in the middle of the pipe, while the velocity is slow or even forms a dead zone near the wall, especially at the bottom, failing to provide sufficient lifting force for solid particles to resist settling.

[0004] To alleviate the problem of deposit clogging, existing technologies typically employ methods such as periodically increasing flow rates for flushing, installing pigging systems, or setting up additional agitation devices. However, increasing flow rates significantly increases energy consumption, and not all processes allow for large fluctuations in flow rates; pigging systems are costly and complex, and may not be suitable for systems prone to scaling or with varying pipe diameters; while external agitation devices increase equipment investment and energy consumption, and are not suitable for long-distance pipelines. Therefore, these methods all have limitations and are not efficient and economical solutions that fundamentally address the problem.

[0005] In response to the aforementioned long-standing technical challenges, it is particularly urgent to develop a new type of pipe structure that can actively intervene in the flow field from a structural perspective and use the fluid's own kinetic energy to achieve continuous stirring to prevent solid deposition. Utility Model Content

[0006] The purpose of this application is to overcome the defects in the prior art where smooth inner wall fiberglass pipes are prone to deposition and blockage when transporting media containing solid particles.

[0007] To achieve the above objectives, this application provides a fiberglass composite pipe with an anti-deposition structure, the pipe including a pipe body and a flow guiding unit integrated within the pipe body; The flow guiding unit is disposed on the inner wall of the pipe body, that is, on the inner surface of the inner lining layer, and extends along the pipe axis. This unit consists of at least one flow guiding blade protruding from the inner wall of the pipe towards the central axis. The protrusion height of the guide vane in the radial direction of the pipe is no more than one-tenth of the nominal inner diameter of the pipe. This height limit ensures that while generating effective turbulence, it does not have a significant adverse impact on the flow capacity and overall pressure drop of the pipe.

[0008] The guide vanes extend around the central axis of the pipe at a constant or varying helical angle, thereby forming at least one helical flow channel within the pipe.

[0009] As an optional technical solution, the guide vane and the inner lining of the pipe body are integrally formed by the material. That is, during the manufacturing process, the guide vane is manufactured as part of the inner lining through molding, winding and other processes, thereby ensuring that it has excellent integrity, corrosion resistance and mechanical strength.

[0010] As another optional technical solution, the guide vanes are locked or adhered to the inner wall surface of the pipe body.

[0011] Furthermore, the pipe body is a multi-layer composite structure, which includes at least an inner lining layer made of thermosetting resin and a structural layer made of glass fiber reinforced material.

[0012] Furthermore, the flow guiding unit is composed of multiple flow guiding blades arranged in a ring around the inner wall of the pipe body.

[0013] Furthermore, multiple flow guiding units are arranged at axial intervals within the pipe body.

[0014] Furthermore, at least at the inlet of the pipeline body, a flow guiding unit is provided.

[0015] When this application is implemented, when a fluid containing solid particles flows through the inside of a pipe, its main flow moves axially and is guided by the guide vanes, generating a tangential velocity component and forming a swirling flow.

[0016] Compared with existing technologies, this application improves the structure by utilizing the swirling effect to break the velocity stratification of the fluid across the pipe cross-section, particularly eliminating the dead zone at the bottom of the pipe, making it difficult for solid particles to settle. The continuously agitated particles are resuspended under the lift generated by the swirling flow and smoothly transported with the main fluid, thereby achieving the self-cleaning function of the pipe and fundamentally alleviating the risk of blockage.

[0017] The beneficial effects listed above are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the embodiments or other descriptive sections of this application. Attached Figure Description

[0018] A better understanding of various aspects of this disclosure will be achieved by reading the following detailed description in conjunction with the accompanying drawings. The positions, dimensions, and extents of the structures shown in the drawings, etc., do not always represent actual positions, dimensions, and extents. In the drawings: Figure 1 This is a schematic diagram of the structure of one embodiment disclosed in this application.

[0019] Figure 2 This is a schematic diagram of the structure of one embodiment disclosed in this application from another perspective.

[0020] Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure of AA. Detailed Implementation

[0021] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0022] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of certain features may be modified in the drawings.

[0023] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. For the sake of brevity and / or clarity, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail; however, where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0024] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0025] See attached document Figures 1 to 3 This embodiment provides an exemplary structure of a fiberglass composite pipe with an anti-deposition structure. It should be noted that the attached drawings show only an exemplary section of the pipe structure; its length, diameter, and the configuration of the flow guiding units are merely to clearly illustrate the structural features of this utility model and should not be construed as limiting the scope of protection of this utility model. In practical applications, the total length of the pipe, the nominal diameter, and the specific arrangement of the flow guiding units can be adjusted and combined according to engineering requirements.

[0026] Specifically, in this embodiment, the pipeline mainly consists of a pipeline body 1 and a flow guiding unit 2.

[0027] The pipe body 1 is a tubular structure that provides a transport channel and primary pressure-bearing function. The flow guiding unit 2, as a core functional component, is fixedly installed on the inner wall of the pipe body 1. Its function is to prevent solid deposition by changing the flow field morphology. The fixed connection between the flow guiding unit 2 and the inner wall of the pipe body 1 is a necessary structural feature to achieve its anti-deposition function.

[0028] Specifically, the pipe body 1 is a multi-layer composite structure, which includes at least an inner lining layer made of corrosion-resistant thermosetting resin (such as unsaturated polyester resin or vinyl ester resin) and a structural layer formed by impregnating glass fiber reinforced material (such as alkali-free glass fiber yarn, felt, or cloth) with resin and then curing it through winding or molding processes.

[0029] The inner lining layer forms the smooth inner surface of the pipe, while the structural layer provides the main mechanical strength. The specific manufacturing process of the pipe body 1, such as the fiber winding angle and the number of layers, can be adjusted according to the required pressure rating, which is well known in the art.

[0030] The flow guiding unit 2 is composed of at least one flow guiding blade 21. The basic characteristics of the flow guiding blade 21 are its shape, size and arrangement in the pipe.

[0031] The guide vane 21 protrudes from the inner wall surface of the pipe body 1 toward the central axis of the pipe. Its cross-sectional shape can be arc-shaped, trapezoidal or rectangular, etc., and a streamlined design is preferred to reduce flow resistance.

[0032] A key structural parameter is that the protrusion height H of the guide vane 21 is no greater than one-tenth of the pipe's internal diameter D, i.e., H ≤ D / 10. For example, for a pipe with a nominal diameter of DN200, the protrusion height H of the guide vane 21 should not exceed 20 mm. This proportional relationship ensures that effective turbulence is generated without excessively sacrificing the pipe's flow capacity. The guide vane 21 extends around the pipe axis at a helical angle, thus forming a continuous helical flow channel. The helical angle can be selected within a certain range, for example, from 15° to 60°.

[0033] As a specific example, for clean water applications where the main purpose is to prevent the slow settling of fine particles, a smaller helix angle, such as 20°, can be used; while for applications involving the transport of high-concentration, easily settling slurries, a larger helix angle, such as 50°, can be used to generate a stronger swirling agitation force.

[0034] Regarding the combination of the flow guiding unit 2 and the pipe body 1, this application provides a variety of feasible implementation schemes.

[0035] In a preferred embodiment, the guide vane 21 and the inner lining of the pipe body 1 are integrally formed from the same material. Specifically, during manufacturing, a spiral groove corresponding to the shape of the guide vane 21 can be machined into the mandrel used to produce the pipe body 1. During the manufacturing of the inner lining, resin fills this groove, and after curing, the guide vane 21 and the inner lining form a seamless, uniform integral structure. This approach ensures the highest connection strength and corrosion resistance.

[0036] As an alternative implementation, the guide vane 21 can also be prefabricated as a separate component and then fixed to the inner wall of the pipe body 1 by locking or adhesive. For example, the prefabricated guide vane 21 can be bonded to a predetermined position using a high-performance chemically resistant adhesive (such as modified epoxy resin adhesive); or, the back of the guide vane 21 can be provided with a snap-fit ​​or threaded structure to cooperate with corresponding structural components pre-embedded on the inner wall of the pipe for locking. Those skilled in the art can select a suitable fixing method according to the specific application scenario and process conditions.

[0037] The arrangement of the flow guiding unit 2 in the pipeline can be varied. For example, a single, continuous flow guiding unit 2 can be installed along the entire pipeline.

[0038] For long-distance pipelines, multiple flow guiding units 2 can be spaced apart along the pipeline axis. These units can have the same direction of rotation and helix angle, or they can be alternated.

[0039] A particularly advantageous arrangement is to install a flow guiding unit 2 at least at the inlet section of the pipeline system, so that the fluid forms a vortex at the beginning of entering the pipeline system, laying the foundation for preventing sedimentation throughout the entire process.

[0040] In addition, the flow guiding unit 2 can be composed of only one flow guiding blade 21, or it can be composed of two, three or more flow guiding blades 21 arranged in a circumferentially uniform ring on the inner wall of the pipe. The multi-blade design can generate a more uniform and stronger swirling field.

[0041] The working principle of this invention is as follows: When a fluid containing solid particles flows through a pipe, the main flow of the fluid is constrained by the guide vanes 21 during its axial movement. Due to the guiding effect of the vanes 21, the fluid acquires an axial velocity while being given a tangential velocity component, thereby forming a strong rotating flow (i.e., vortex) within the pipe cross-section. This vortex effect significantly enhances the turbulence of the fluid, effectively disrupting velocity stratification in laminar flow, and particularly eliminating the low-velocity zone or "dead zone" at the bottom of the pipe. Continuous rotational shearing and convective motion generate effective stirring and lifting forces on the solid particles, preventing their sedimentation and accumulation, allowing them to be smoothly transported with the main fluid, thus achieving the self-cleaning function of the pipe and fundamentally preventing blockage.

[0042] By adopting the above structure, the fiberglass composite pipe provided by this utility model is particularly suitable for applications prone to solid deposition, such as sewage treatment, mine tailings transportation, and river dredging. Compared with pipes with smooth inner walls, this pipe structure can significantly extend the maintenance cycle and improve the operational reliability of the transportation system.

[0043] While exemplary embodiments of this disclosure have been described, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope thereof. Therefore, all changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A fiberglass composite pipe with an anti-deposition structure, comprising a pipe body (1), characterized in that, It also includes a flow guiding unit (2) integrated within the pipe body (1); The flow guiding unit (2) is disposed on the inner wall of the pipe body (1) and extends along the pipe axis. The unit is composed of at least one flow guiding blade (21) protruding from the inner wall of the pipe toward the central axis. The protrusion height of the guide vane (21) in the radial direction of the pipe is not greater than one-tenth of the nominal inner diameter of the pipe; The guide vanes (21) extend around the central axis of the pipe at a constant or varying helix angle.

2. The fiberglass composite pipe with anti-deposition structure according to claim 1, characterized in that, The guide vane (21) and the inner lining (11) of the pipe body (1) are integrally formed by the material.

3. The fiberglass composite pipe with anti-deposition structure according to claim 1, characterized in that, The guide vane (21) is locked or adhered to the inner wall surface of the pipe body (1).

4. The fiberglass composite pipe with anti-deposition structure according to claim 1, characterized in that, The pipe body (1) is a multi-layer composite structure, which includes at least an inner lining layer (11) made of thermosetting resin and a structural layer (12) made of glass fiber reinforced material.

5. A fiberglass composite pipe with an anti-deposition structure according to claim 1, characterized in that, The flow guiding unit (2) is composed of multiple flow guiding blades (21) arranged in a ring on the inner wall of the pipe body (1).

6. A fiberglass composite pipe with an anti-deposition structure according to claim 1, characterized in that, Multiple flow guiding units (2) are arranged axially at intervals inside the pipe body (1).

7. A fiberglass composite pipe with an anti-deposition structure according to claim 1, characterized in that, At least a flow guiding unit (2) is provided at the inlet of the pipe body (1).

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