Multi-stage compound rectifier and fluid pipeline delivery system

Abstract

The application discloses a multistage composite rectifier and a fluid pipeline conveying system. The multistage composite rectifier comprises a first-stage rectifying section, a second-stage rectifying section, a third-stage rectifying section, a first buffer section and a second buffer section. The first-stage rectifying section comprises first-stage guide vanes which are uniformly distributed on the pipe wall. The second-stage rectifying section comprises second-stage guide vanes which are cross-distributed in the pipeline. The third-stage rectifying section comprises rectifying holes and rectifying flow channels, and the third-stage rectifying section is divided into multiple rectifying flow channels by the rectifying holes. The fluid pipeline conveying system comprises the multistage composite rectifier. The application is used for improving fluid flow characteristics, reducing turbulence and non-uniformity in the flow by adjusting the fluid flow direction and velocity distribution in the pipeline, reducing flow resistance and improving the overall energy efficiency of the system.

Description

Technical Field

[0001] This application relates to the field of rectifier technology, and in particular to a multi-stage composite rectifier and fluid pipeline transportation system. Background Technology

[0002] In fluid pipeline transportation systems, components such as bends, valves, and variable cross-section pipes can easily affect the stability of flow within the pipe, increase flow resistance, and lead to increased energy consumption. They can also cause vibration and noise in the pipeline system, reducing its service life.

[0003] Fluid measurement is a critical component of fluid transport systems, and ensuring accurate measurement is essential for process control, billing, and system efficiency. Non-uniform or turbulent flow can interfere with flow meter readings, causing measurement errors and making it difficult to meet the requirements for acquiring stable and accurate flow measurement signals at close range from turbulent components. Generally, straight pipes with diameters tens or even hundreds of times longer are needed to completely eliminate the influence of unstable flow fields on accurate fluid measurement.

[0004] To effectively eliminate the influence of these devices on the local pipeline flow field, methods such as adding a sufficiently long straight pipe section or a rectifier are commonly used upstream of the flow meter. However, adding a long straight pipe section is difficult to implement in practical engineering applications due to the high space and cost requirements. Existing technologies disclose various perforated plate rectifiers, which typically rearrange non-uniform fluids through a perforated plate to achieve a uniform flow velocity distribution. While these rectifiers, due to the large length of their components, can improve the fluid velocity distribution to some extent, they cannot guarantee that the length of the preceding and following straight pipe sections does not affect the metering accuracy of the ultrasonic flow meter. Summary of the Invention

[0005] The purpose of this application is to provide a multi-stage composite rectifier to solve the problem of local flow instability caused by turbulent components such as bends, valves, and variable cross-section pipes in fluid pipeline transportation systems, which exists in related technologies. This invention can adjust the direction and velocity distribution of fluid flow, reduce turbulence and non-uniformity in the flow, and improve the efficiency and effectiveness of the system.

[0006] In a first aspect, embodiments of this application provide a multi-stage composite rectifier, comprising:

[0007] The first stage rectifier section includes a first rectifier tube and several first stage guide vanes. The several first stage guide vanes are evenly distributed in a ring around the central axis of the flow channel on the inner wall of the first rectifier tube, and one end of the first stage guide vane near the central axis of the flow channel is suspended.

[0008] The second-stage rectifier section includes a second rectifier tube and several second-stage guide vanes. The several second-stage guide vanes are evenly distributed in a ring around the central axis of the flow channel on the inner wall of the second rectifier tube. The several second-stage guide vanes are evenly distributed in a cross pattern and connected at one end near the central axis of the flow channel.

[0009] The third-stage rectifier section includes a third rectifier tube, a rectifier channel, and a rectifier hole. The third-stage rectifier section is provided with multiple rectifier channels, and each rectifier channel has multiple rectifier holes.

[0010] The first buffer section connects the first-stage rectifier section and the second-stage rectifier section;

[0011] The second buffer section connects the second-stage rectifier section and the third-stage rectifier section.

[0012] Preferably, the diameter of the first buffer section is equal to the diameter of the connection between the first-stage rectifier section and the second-stage rectifier section connected to its two ends, and the diameter of the second buffer section is equal to the diameter of the connection between the second-stage rectifier section and the third-stage rectifier section connected to its two ends. The lengths of the first buffer section and the second buffer section are both between 0.1d and 0.4d, where d is the inlet diameter of the first-stage rectifier section.

[0013] Preferably, the length of the first-stage guide vane l 1 < 0.5d, where d is the inlet diameter of the first-stage rectifier section, the number of blades is greater than 3, and there is an inclination angle θ1 between the blades and the central axis of the flow channel, 0 < θ1 < 90°.

[0014] Preferably, the first rectifier tube is a horn-shaped shrinkage tube with an inlet diameter larger than the outlet diameter; the second rectifier tube is a horn-shaped diffuser tube with an inlet diameter smaller than the outlet diameter.

[0015] Preferably, the shape of the rectifier hole can be circular, elliptical, or any other combination of shapes, and the rectifier holes are distributed in a ring-shaped central symmetrical pattern around the central axis.

[0016] Preferably, the wall thickness of the gap between two adjacent rectifier holes is less than 1 mm.

[0017] Preferably, the rectifier channels located at the same horizontal position as the central axis are parallel to the central axis, and the rectifier channels located on the upper and lower sides of the central axis plane are bent to both sides, with a bending angle θ2 < 90°.

[0018] Secondly, embodiments of this application provide a fluid pipeline transportation system, including the aforementioned multi-stage composite rectifier.

[0019] Optionally, the multi-stage composite rectifier is located behind the flow-disrupting components of the fluid pipeline transport system.

[0020] Optionally, the flow-disrupting component is selected from bends, valves, and variable cross-section pipes.

[0021] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0022] As can be seen from the above embodiments, this application employs multi-stage segmented rectification. When the fluid passes through the first-stage rectification section, it is guided by the first-stage guide vanes uniformly distributed in a ring around the central axis on the inner pipe wall. The locally eccentric jets located at the edge of the flow channel change their flow direction and converge towards the central axis of the pipe, achieving initial rectification of the fluid. When the fluid passes through the second-stage rectification section, the second-stage rectification vanes uniformly divide the flow channel, making the fluid flow velocity more uniform in spatial distribution, achieving further rectification of the fluid. When the fluid passes through the third-stage rectification section, it enters the rectification channel through the rectification orifice, integrating the magnitude and direction of the fluid flow velocity. A stable and uniform flow field is obtained when the fluid exits through the rectification orifice at the outlet of the rectification channel. Through the multi-stage segmented rectification of the first, second, and third-stage rectification sections, the stability and uniformity of fluid flow are improved to the greatest extent within a short pipe distance.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 This is a schematic diagram of a multi-stage rectifier structure provided in an embodiment of the present invention.

[0026] Figure 2 The diagram shows the structure of the first-stage rectifier section provided in the embodiment of the present invention. (a) is the left view and (b) is the front view.

[0027] Figure 3 The diagram shows the structure of the second-stage rectifier section provided in the embodiment of the present invention. (a) is a perspective view and (b) is a front view.

[0028] Figure 4 This is a schematic diagram of the third-stage rectifier section structure provided in an embodiment of the present invention.

[0029] Figure 5 This is a cross-sectional view of the third-stage rectifier section provided in an embodiment of the present invention.

[0030] Figure 6 This is a cross-sectional view of the third-stage rectifier section AA provided in an embodiment of the present invention.

[0031] Reference numerals in the attached drawings: 1. First rectifier tube; 2. Second rectifier tube; 3. Third rectifier tube; 4. First buffer section; 5. First-stage guide vane; 6. Second-stage guide vane; 7. Rectifying channel; 8. Rectifying orifice; 9. Second buffer section. Detailed Implementation

[0032] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0033] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0034] refer to Figures 1-6 This invention provides a multi-stage composite rectifier, characterized in that it includes: a first-stage rectifier section, a second-stage rectifier section, a third-stage rectifier section, a first buffer section 4, and a second buffer section 9.

[0035] The first stage rectifier section includes a first rectifier tube 1 and a plurality of first stage guide vanes 5. The plurality of first stage guide vanes 5 are evenly distributed in a ring around the central axis of the flow channel on the inner wall of the first rectifier tube 1, and one end of the first stage guide vane 5 near the central axis of the flow channel is suspended.

[0036] The second-stage rectifier section includes a second rectifier tube 2 and several second-stage guide vanes 6. The several second-stage guide vanes 6 are evenly distributed in a ring around the central axis of the flow channel on the inner wall of the second rectifier tube 2. The several second-stage guide vanes 6 are evenly distributed in a cross pattern and connected at one end near the central axis of the flow channel.

[0037] The third-stage rectifier section includes a third rectifier tube 3, a rectifier channel 7, and a rectifier hole 8. The third-stage rectifier section is provided with multiple rectifier channels 7, and each rectifier channel 7 has multiple rectifier holes 8.

[0038] In this embodiment, the diameter of the first buffer section 4 is equal to the diameter of the connection between the first-stage rectifier section and the second-stage rectifier section connected to its two ends, and the diameter of the second buffer section 5 is equal to the diameter of the connection between the second-stage rectifier section and the third-stage rectifier section connected to its two ends. The lengths of the first buffer section and the second buffer section are both h1=0.5d, where d is the inlet diameter of the first-stage rectifier section, thereby reducing the flow energy loss caused by the abrupt change in shape between adjacent rectifier sections.

[0039] In this embodiment, the first rectifier tube 1 is a trumpet-shaped shrink tube with an inlet diameter larger than its outlet diameter, and the length of the first-stage guide vane 5 is... l 1 < 0.5d, the number of blades is greater than 3, and there is an inclination angle θ1 between the blades and the central axis of the flow channel, 0 < θ1 < 90°. When the fluid passes through the first stage rectification section, it undergoes preliminary rectification. Under the action of the first stage guide blades 5, the local eccentric jets at the edge of the flow channel converge towards the center of the flow channel.

[0040] In this embodiment, the second-stage rectifier tube 2 is a horn-shaped diffuser tube with an inlet diameter smaller than the outlet diameter. When the fluid flows through the second-stage rectifier section, it is rectified again, making the fluid flow velocity more uniform in spatial distribution.

[0041] In this embodiment, the rectifier channel 7 located at the same horizontal position as the central axis is parallel to the central axis. The rectifier channels 7 located on the upper and lower sides of the central axis plane are bent to both sides, with a bending angle θ2 < 90°. When the fluid flows through the third stage rectifier section, the direction of the fluid flow velocity is re-integrated to obtain a stable and uniform flow cross section.

[0042] The specific shape of the rectifier hole can be circular, elliptical, or any other combination of shapes. The rectifier holes 8 are distributed in a ring-shaped central symmetrical manner around the central axis, and the wall thickness of the gap between the rectifier holes 8 is less than 1 mm.

[0043] As can be seen from the above embodiments, this application employs multi-stage segmented rectification. When the fluid passes through the first-stage rectification section, because the first rectification tube is a flared converging tube, and the fluid is also guided by the first-stage guide vanes uniformly distributed in a ring around the central axis on the inner tube wall, the local eccentric jets at the edge of the flow channel will change their flow direction and converge towards the central axis of the pipe, thus achieving initial rectification of the fluid. When the fluid passes through the second-stage rectification section, because the second rectification tube is a flared diverging tube and the second-stage rectification vanes uniformly divide the flow channel, the fluid flow velocity is more uniformly distributed in space, achieving further rectification of the fluid. When the fluid passes through the third-stage rectification section, the fluid enters the rectification channel through the rectification orifice, integrating the magnitude and direction of the fluid flow velocity. When the fluid flows out of the rectification orifice at the outlet of the rectification channel, a stable and uniform flow field can be obtained. Through the multi-stage segmented rectification of the first, second, and third rectification sections, the stability and uniformity of fluid flow are improved to the greatest extent within a relatively short pipe distance.

[0044] This application provides a fluid pipeline transportation system, including the multi-stage composite rectifier described above.

[0045] Specifically, the multi-stage composite rectifier is located downstream of the flow-disrupting components in the fluid pipeline transportation system. These components are selected from bends, valves, variable cross-section pipes, etc. The multi-stage composite rectifier can solve the problem of localized flow instability caused by flow-disrupting components such as bends, valves, and variable cross-section pipes in the fluid pipeline transportation system.

[0046] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0047] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A multi-stage composite rectifier, characterized in that, include: The first stage rectifier section includes a first rectifier tube and a plurality of first stage guide vanes. The plurality of first stage guide vanes are evenly distributed in a ring around the central axis of the flow channel on the inner wall of the first rectifier tube, and the end of the first stage guide vane near the central axis of the flow channel is suspended. The second-stage rectifier section includes a second rectifier tube and several second-stage guide vanes. The several second-stage guide vanes are evenly distributed in a ring around the central axis of the flow channel on the inner wall of the second rectifier tube. The several second-stage guide vanes are evenly distributed in a cross pattern and connected at one end near the central axis of the flow channel. The third-stage rectifier section includes a third rectifier tube, a rectifier channel, and a rectifier hole. The third-stage rectifier section is provided with multiple rectifier channels, and the rectifier channels have multiple rectifier holes. The first buffer section connects the first-stage rectifier section and the second-stage rectifier section; The second buffer section connects the second-stage rectifier section and the third-stage rectifier section; The first rectifier tube is a horn-shaped shrink tube with an inlet diameter larger than its outlet diameter; the second rectifier tube is a horn-shaped diffuser tube with an inlet diameter smaller than its outlet diameter.

2. The multi-stage composite rectifier according to claim 1, characterized in that, The diameter of the first buffer section is equal to the diameter of the connection between the first-stage rectifier section and the second-stage rectifier section connected to its two ends. The diameter of the second buffer section is equal to the diameter of the connection between the second-stage rectifier section and the third-stage rectifier section connected to its two ends. The lengths of the first buffer section and the second buffer section are both between 0.1d and 0.4d, where d is the inlet diameter of the first-stage rectifier section.

3. The multi-stage composite rectifier according to claim 1, characterized in that, Length of the first-stage guide vane l 1 < 0.5d, where d is the inlet diameter of the first-stage rectifier section, the number of blades is greater than 3, and there is an inclination angle θ1 between the blades and the central axis of the flow channel, 0 < θ1 < 90°.

4. A multi-stage composite rectifier according to claim 1, characterized in that, The rectifier holes are circular or elliptical in shape and are distributed symmetrically around the central axis in a ring shape.

5. A multi-stage composite rectifier according to claim 1, characterized in that, The wall thickness of the gap between two adjacent rectifier holes is less than 1 mm.

6. A multi-stage composite rectifier according to claim 1, characterized in that, The flow channels located at the same horizontal position as the central axis are parallel to the central axis. The flow channels located on the upper and lower sides of the central axis plane are bent to both sides, with a bending angle θ2 < 90°.

7. A fluid pipeline transportation system, characterized in that, Includes the multi-stage composite rectifier as described in any one of claims 1-6.

8. A fluid pipeline transportation system according to claim 7, characterized in that, The multi-stage composite rectifier is located behind the flow-disrupting components of the fluid pipeline transportation system.

9. A fluid pipeline transportation system according to claim 8, characterized in that, The flow-disrupting components are selected from bends, valves, and variable cross-section pipes.

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