Combined flow regulator for fluid pipeline system and fluid pipeline system

Abstract

The present invention discloses a combined flow regulator for a fluid pipeline system and a fluid pipeline system. The combined flow regulator includes a three-stage rectification section and two rectification cavities. The first-stage rectification section is a nested combination of a V-shaped flow guide cone, flow guide vanes, and a hollow variable-diameter cylinder, and a plurality of flow guide holes with different diameters are arranged on the side wall of the variable-diameter cylinder in an array distribution along the pipeline center. The second-stage rectification section is a combined structure in which grid orifice plates and streamlined vanes are arranged alternately, and the vane groups with different angles from the previous vane group are arranged staggeredly. The third-stage rectification section is a hexagonal straightening channel. The first rectification cavity has a structure of first expanding and then contracting, and the lengths of the expansion section and the contraction section are the same, and the inlet and outlet diameters are the same. By optimizing the flow channel structure and adjusting the flow direction, the present invention aims to improve the flow characteristics of the fluid after disturbing flow components such as elbows and valves, reduce non-uniform flow, and thus improve the performance and energy efficiency of the pipeline system.

Description

Technical Field

[0001] The present application relates to the technical field of fluid pipelines, and in particular, to a combined flow regulator for optimizing the flow technology of a fluid pipeline system. Background Art

[0002] In a fluid flow pipeline system, disturbing flow components such as elbows, valves, and deformed pipelines often have a significant impact on the stability of the flow inside the pipeline, making it difficult to meet the requirements for accurately collecting flow measurement signals stably and closely to the disturbing flow components. Installing a flow straightener has become an effective way to optimize the current flow field. Thus, it can effectively improve the inflow conditions, make the flow field tend to be stable within a short flow distance, significantly improve the accuracy of flow measurement, and reduce the fluid transportation cost. Although the flow straightener has a certain effect in improving flow stability, traditional straightening structures often cannot effectively deal with characteristic flows such as eccentric jets after a process valve, and its straightening effect is limited. Compared with the classical regulator structure, the combined flow regulator shows better performance. The existing technologies mainly focus on simple improvements to the classical orifice plate type and vane type structures, usually by changing the orifice plate aperture and centering angle in order to form a uniform flow, while there is less research on innovative structures for re-integrating the incoming flow, re-dividing the flow path, guiding the fluid flow, etc. For example, in CN117869794A - Multistage Composite Flow Straightener and Fluid Pipeline Transportation System Design, a common swirl type structure is used for the incoming flow, which is also the idea used in most current combined flow straighteners. Although this structure can improve the flow stability, it may also cause locally non-uniform vortices, and the eddy current problem at the tail of the second-stage guide vane is not considered. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a combined flow regulator for optimizing the flow technology of a fluid pipeline system to solve the technical problems of disturbing flows such as eccentric flow and eddy current after a valve or in a pipeline in the related art, as well as the technical problem of poor effects of ordinary flow straighteners. The embodiments of the present application effectively reduce the turbulence and non-uniformity in the flow by adjusting the fluid flow direction and velocity distribution, thereby significantly improving the overall efficiency and performance of the system.

[0004] According to the first aspect of the embodiments of the present application, a multistage combined flow straightener is provided, including:

[0005] The first-stage rectification section, the first-stage rectification section includes a first rectification tube and a V-shaped flow guide cone, a first-stage flow guide vane, and a hollow variable-diameter cylinder that are installed in the first rectification tube and arranged in sequence along the fluid flow direction. The V-shaped flow guide cone is fixed at the incoming flow end of the hollow variable-diameter cylinder. A plurality of the first-stage flow guide vanes are evenly distributed in a ring around the V-shaped flow guide cone on the end wall of the expansion section of the first rectification tube. One end of a plurality of the first-stage flow guide vanes close to the flow channel central axis is fixed to the hollow variable-diameter cylinder. A plurality of evenly distributed first rectification holes are opened on the front side wall of the hollow variable-diameter cylinder, and a plurality of evenly distributed second rectification holes are opened on the rear side wall;

[0006] The second-stage rectification section, the second-stage rectification section includes a second rectification tube and a second-stage flow guide vane, a thin-walled sleeve, and a square grid orifice plate installed in the second rectification tube. The grid orifice plate and the second-stage flow guide vane are arranged alternately along the pipeline axis and are arranged in a staggered manner with a blade group having a different angle from the first-stage flow guide vane. A plurality of thin-walled sleeves with different diameters are arranged at equal distances along the pipeline radial direction. The second-stage flow guide vane is evenly divided by the thin-walled sleeve and then fixed to the inner wall of the second rectification tube;

[0007] The third-stage rectification section, the third-stage rectification section includes a third rectification tube and a honeycomb rectification structure fixed in the third rectification tube;

[0008] The first rectification cavity, which communicates the first-stage rectification section and the second-stage rectification section;

[0009] The second rectification cavity, which communicates the second-stage rectification section and the third-stage rectification section.

[0010] Further, the outlet diameter of the first rectification cavity is equal to the inlet diameters of the first-stage rectification section and the second-stage rectification section, both being D1; the diameter of the second rectification cavity is equal to the diameter at the connection of the second-stage rectification section and the third-stage rectification section, both being D2.

[0011] Further, the length of the first rectification cavity is h1, h1 = 0.25D1, and the length of the second rectification cavity is h2, h2 = 0.25D2.

[0012] Further, the first rectification tube 1 is a variable-diameter structure with first expansion and then contraction. The maximum diameter of the expansion tube is D1, the minimum diameter of the contraction tube is D2, the lengths of the expansion section and the contraction section are equal, both being 0.5D1, and the inlet and outlet diameters of the first rectification tube are equal, both being D2.

[0013] Further, there is an inclination angle θ1 between the hollow variable-diameter cylinder and the flow channel central axis, 0 < θ1 < 90°.

[0014] Further, there is an inclination angle θ2 between the middle of the first-stage flow guide vane and the flow channel central axis, 0 < θ2 < 90°.

[0015] Further, the diameter of the first rectifying hole is d1, and the diameter of the second rectifying hole is d2, where d2 > d1.

[0016] Further, the tails of the first-stage guide vanes and the second-stage guide vanes are both designed to be streamlined.

[0017] According to a second aspect of the embodiments of the present application, a fluid pipeline system is provided, including the multi-stage combined rectifier described in the first aspect.

[0018] Further, the multi-stage combined rectifier is located behind the flow disturbing component of the fluid pipeline system.

[0019] The technical solutions provided by the embodiments of the present application may include the following beneficial effects:

[0020] As can be seen from the above embodiments, the present application adopts multi-stage segmented rectification. When the fluid passes through the first rectification stage, the first rectifying tube has a structure of first expanding and then contracting. When the fluid passes through the expanding tube section, the fluid is guided by the V-shaped guiding cone and the first-stage guide vanes evenly divide the flow channel, and the first-stage rectifying holes uniformly distributed on the side wall of the variable-diameter cylinder around the central axis act, so that the flow rate slows down, especially the fluid in the boundary layer is alleviated, thereby reducing the formation of eccentric flow and reducing the non-uniformity in the flow. As the fluid enters the contracting part, the flow rate increases and the flow efficiency is improved. The local eccentric jet flow at the edge of the flow channel will change the flow direction and converge towards the central axis of the pipeline. The second-stage rectifying holes can ensure that the fluid enters the second rectification stage orderly, avoiding energy loss caused by sudden local pressure drop or excessive local flow rate, and realizing the preliminary rectification of the fluid. When the fluid passes through the second rectification stage, the stability of the fluid flow is maintained by the grid plate, and the staggered streamlined blades guide the fluid flow, weakening the flow resistance, reducing the generation of non-uniform flow velocity and the eddy current at the blade tail, and further realizing the re-rectification of the fluid. When the fluid passes through the third rectification stage, through the regular channel structure, the fluid flows along a consistent direction and flow rate when passing through, and the flow efficiency and stability in the downstream are further improved. Through the multi-stage segmented rectification of the above first, second, and third rectification stages, the flow stability and uniformity of the fluid are improved to the greatest extent within a short pipeline distance.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings here are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0023] Figure 1Schematic diagram of the multi-stage combined rectifier provided by the embodiment of the present invention.

[0024] Figure 2 Dimension diagram of the multi-stage combined rectifier provided by the embodiment of the present invention.

[0025] Figure 3 Schematic diagram of the first-stage rectification section provided by the embodiment of the present invention. (a) is a perspective view, and (b) is a left view.

[0026] Figure 4 Schematic diagram of the second-stage rectification section provided by the embodiment of the present invention. (a) is a perspective view, and (b) is a left view.

[0027] Figure 5 Schematic diagram of the grid orifice plate provided by the embodiment of the present invention. (a) is a perspective view, and (b) is a left view.

[0028] Figure 6 Schematic diagram of the third-stage rectification section provided by the embodiment of the present invention. (a) is a perspective view, and (b) is a left view.

[0029] Figure 7 Schematic diagram and dimension diagram of the first-stage guide vane and hollow variable-diameter cylinder provided by the embodiment of the present invention.

[0030] Figure 8 Schematic diagram of the streamlined blade provided by the embodiment of the present invention.

[0031] Reference numerals:

[0032] 1. First rectifying tube; 2. Second rectifying tube; 3. Third rectifying tube; 4. V-shaped flow guide cone; 5. First-stage guide vane; 6. Hollow variable-diameter cylinder; 7. Second-stage guide vane; 8. Thin-walled sleeve; 9. Grid orifice plate; 10. Honeycomb straightener; 11. First rectifying cavity; 12. Second rectifying cavity; 13. First rectifying hole; 14. Second rectifying hole. Detailed implementation manners

[0033] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are only examples of the devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0034] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "the", and "said" used in this application and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0035] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0036] Reference Figures 1-8 , an embodiment of the present invention provides a combined flow conditioner, including: a first-stage rectification section, a second-stage rectification section, a third-stage rectification section, a first rectification cavity 11 and a second rectification cavity 12, wherein:

[0037] The first-stage rectification section includes a first rectification tube 1 and a V-shaped flow guide cone 4, a first-stage flow guide vane 5, and a hollow variable-diameter cylinder 6 that are installed in the first rectification tube 1 and arranged in sequence along the fluid flow direction. The V-shaped flow guide cone 4 is fixed to the incoming flow end of the hollow variable-diameter cylinder 6. A plurality of the first-stage flow guide vanes 5 are evenly distributed in a ring around the V-shaped flow guide cone 4 on the wall of the expansion section end of the first rectification tube 1. One end of a plurality of the first-stage flow guide vanes 5 close to the flow channel central axis is fixed to the hollow variable-diameter cylinder 6. A plurality of evenly distributed first rectification holes 13 are opened on the front side wall of the hollow variable-diameter cylinder 6, and a plurality of evenly distributed second rectification holes 14 are opened on the rear side wall.

[0038] In one embodiment, the V-shaped flow guide cone 4 may be a solid structure and is fixed to the incoming flow end of the hollow variable-diameter cylinder 6.

[0039] The second-stage rectification section includes a second rectification tube 2 and a second-stage flow guide vane 7, a thin-walled sleeve 8, and a square grid orifice plate installed in the second rectification tube 2. The grid orifice plate and the second-stage flow guide vane 7 are arranged alternately along the pipeline axis and are arranged in a staggered manner with a blade group having a different angle from that of the first-stage flow guide vane 5. A plurality of thin-walled sleeves 8 with different diameters are arranged at equal distances along the pipeline radial direction. The second-stage flow guide vane 7 is evenly divided by the thin-walled sleeve 8 and fixed to the inner wall of the second rectification tube 2.

[0040] The third-stage rectification section includes a third rectification tube 3 and a honeycomb rectification structure fixed inside the third rectification tube 3.

[0041] In one embodiment, the honeycomb rectification structure includes a number of straight rectification tubes with hexagonal openings, and the honeycomb rectification structure is nested and connected inside the third rectification tube 3.

[0042] The first rectification cavity 11 communicates with the first-stage rectification section and the second-stage rectification section; the second rectification cavity 12 communicates with the second-stage rectification section and the third-stage rectification section.

[0043] In this embodiment, the outlet diameter of the first rectification cavity 11 is equal to the inlet diameters of the first-stage rectification section and the second-stage rectification section, the diameter of the second rectification cavity 12 is equal to the diameter at the connection of the second-stage rectification section and the third-stage rectification section to which it is connected at both ends, and the lengths are both D2. The length of the first rectification cavity 11 is h1, h1 = 0.25D1, and the length of the second rectification cavity 12 is h2, h2 = 0.25D2.

[0044] In this embodiment, the first rectification tube 1 has a variable-diameter structure that first expands and then contracts. The maximum diameter of the expanding tube is D1, the minimum diameter of the contracting tube is D2, the lengths of the expanding section and the contracting section are equal, both being 0.5D1, and the inlet and outlet diameters of the first rectification tube 1 are equal, both being D2.

[0045] In this embodiment, there is an inclination angle θ1 between the hollow variable-diameter cylinder 6 and the central axis of the flow channel, 0 < θ1 < 90°. There is an inclination angle θ2 between the middle of the first-stage guide vane 5 and the central axis of the flow channel, 0 < θ2 < 90°. The diameter of the first rectification hole 13 is d1, and the diameter of the second rectification hole 14 is d2, d2 > d1, and θ2 = θ1. When the fluid passes through the first-stage rectification section, the first rectification tube 1 has a structure that first expands and then contracts. When the fluid passes through the expanding tube section, the fluid is guided by the V-shaped guide cone 4 and the first-stage guide vane 5 evenly divides the flow channel, and the first-stage rectification holes uniformly distributed on the side wall of the variable-diameter cylinder around the central axis act on it, so that the flow rate slows down. In particular, the fluid in the boundary layer is alleviated, thereby reducing the formation of eccentric flow and reducing the non-uniformity in the flow. As the fluid enters the contracting part, the flow rate increases and the flow efficiency improves. The local eccentric jet at the edge of the flow channel will change the flow direction and converge towards the central axis of the pipeline. The second-stage rectification hole can ensure that the fluid enters the second-stage rectification section orderly, avoiding energy loss caused by sudden local pressure drop or excessive local flow rate, and realizing the preliminary rectification of the fluid.

[0046] In this embodiment, the diameters of the thin-walled sleeve 8 are D3 and D4 respectively, and the plate thickness is less than 2 mm. The grid orifice plate structure is of a symmetric design, and the plate thickness is less than 2 mm. The tails of the first-stage guide vanes 5 and the second-stage guide vanes 7 are both of streamline designs. When the fluid passes through the second-stage rectification section, the stability of the fluid flow is maintained by the grid plate, and the staggered streamline vanes guide the fluid flow, reducing the flow resistance, decreasing the non-uniform flow velocity and the generation of eddies at the vane tails, and further achieving the re-rectification of the fluid.

[0047] In this embodiment, the wall thickness of the rectifying pipes of the hexagonal rectifying channels is less than 0.2 mm. When the fluid passes through the third-stage rectification section, due to the regular channel structure, the fluid flows along a consistent direction and velocity when passing through, and the flow efficiency and stability in the downstream are further improved.

[0048] As can be seen from the above embodiments, the present application is located behind the flow disturbing components in the fluid pipeline conveying system. By re-integrating the incoming flow, re-dividing the flow channels, and optimizing the vane structure, the problems of eccentric jet flow, eddies, and local flow instability caused by flow disturbing components such as elbows, valves, and variable cross-section pipes in the fluid pipeline conveying system can be solved within a short distance.

[0049] The combined rectifier adopts multi-stage segmented rectification. When the fluid passes through the first-stage rectification section, the first rectifying pipe 1 has a structure of first expanding and then contracting. When the fluid passes through the expanding pipe section, the fluid is guided by the V-shaped guiding cone 4 and the first-stage guide vanes 5 evenly divide the flow channel, and the first-stage rectifying holes uniformly distributed on the side wall of the variable-diameter cylinder around the central axis act on the fluid, resulting in a slower flow velocity. In particular, the fluid in the boundary layer is alleviated, thereby reducing the formation of eccentric flow and decreasing the non-uniformity in the flow. As the fluid enters the contracting part, the flow velocity increases and the flow efficiency improves. The local eccentric jet flow at the edge of the flow channel will change the flow direction and converge towards the central axis of the pipeline. The second-stage rectifying holes can ensure that the fluid enters the second-stage rectification section orderly, avoiding energy loss caused by sudden local pressure drop or excessive local flow velocity, and achieving the preliminary rectification of the fluid. When the fluid passes through the second-stage rectification section, the stability of the fluid flow is maintained by the grid plate, and the staggered streamline vanes guide the fluid flow, reducing the flow resistance, decreasing the non-uniform flow velocity and the generation of eddies at the vane tails, and further achieving the re-rectification of the fluid. When the fluid passes through the third-stage rectification section, due to the regular channel structure, the fluid flows along a consistent direction and velocity when passing through, and the flow efficiency and stability in the downstream are further improved. The first-stage rectification section can not only guide the incoming flow to flow in the variable-diameter structure, but also re-divide the flow channel, and the fluid velocity is adjusted in a timely manner. At the same time, the streamline design of the vanes can reduce the formation and accumulation of eddies at the vane tails. Through the multi-stage segmented rectification of the above first, second, and third-stage rectification sections, the flow stability and uniformity of the fluid are maximally improved within a relatively short pipeline distance.

[0050] An embodiment of the present invention further provides a fluid pipeline system, which includes the above-mentioned multi-stage combined rectifier. Further, the multi-stage combined rectifier is located behind the flow disturbing component of the fluid pipeline system.

[0051] After considering the specification and practicing the content disclosed herein, those skilled in the art will readily conceive of other embodiments of the present application. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include common general knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the claims.

[0052] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A multi-stage combined rectifier, characterized in that, Comprising: A first-stage rectification section, the first-stage rectification section includes a first rectification tube and a V-shaped flow guide cone, a first-stage flow guide vane, and a hollow variable-diameter tube arranged in sequence along the fluid flow direction inside the first rectification tube. The first rectification tube is a variable-diameter structure with a first expansion and then contraction. The V-shaped flow guide cone is fixed at the incoming flow end of the hollow variable-diameter tube. A number of the first-stage flow guide vanes are evenly distributed in a ring around the V-shaped flow guide cone on the end wall of the expansion section of the first rectification tube. One end of a number of the first-stage flow guide vanes close to the flow channel central axis is fixed to the hollow variable-diameter tube. A number of evenly distributed first rectification holes are opened on the front side wall of the hollow variable-diameter tube, and a number of evenly distributed second rectification holes are opened on the rear side wall; A second-stage rectification section, the second-stage rectification section includes a second rectification tube and a second-stage flow guide vane, a thin-walled sleeve, and a square grid orifice plate installed inside the second rectification tube. The grid orifice plate and the second-stage flow guide vane are arranged alternately along the pipeline axis and are arranged in a staggered manner with a blade group having a different angle from the first-stage flow guide vane. A number of thin-walled sleeves with different diameters are arranged at equal distances along the pipeline radial direction. The second-stage flow guide vane is evenly divided by the thin-walled sleeve and then fixed to the inner wall of the second rectification tube. The tails of the first-stage flow guide vane and the second-stage flow guide vane are both designed to be streamlined; A third-stage rectification section, the third-stage rectification section includes a third rectification tube and a honeycomb rectification structure fixed inside the third rectification tube. The honeycomb rectification structure includes a number of straightening tubes with a hexagonal opening form. The honeycomb rectification structure is nested and connected with the inside of the third rectification tube. The wall thickness of the straightening tubes of the hexagonal straightening holes is less than 0.2 mm; A first rectification cavity, connecting the first-stage rectification section and the second-stage rectification section. The outlet diameter of the first rectification cavity is equal to the inlet diameters of the first-stage rectification section and the second-stage rectification section; A second rectification cavity, connecting the second-stage rectification section and the third-stage rectification section. The diameter of the second rectification cavity is equal to the diameter at the connection of the second-stage rectification section and the third-stage rectification section to which it is connected at both ends.

2. The multi-stage combined rectifier according to claim 1, characterized in that, The length of the first rectification cavity is h1, h1 = 0.25D1, the length of the second rectification cavity is h2, h2 = 0.25D2, D1 is the maximum diameter of the expansion tube of the first rectification tube, and D2 is the minimum diameter of the contraction tube of the first rectification tube.

3. The multi-stage combined rectifier according to claim 1, wherein, The maximum diameter of the expansion tube of the first rectification tube is D1, the minimum diameter of the contraction tube is D2, the lengths of the expansion section and the contraction section are equal, and the length is 0.5D1. The inlet and outlet diameters of the first rectification tube are equal, both being D2.

4. A multi-stage combined rectifier according to claim 1, characterized in that, There is an inclination angle θ1 between the hollow variable-diameter tube and the flow channel central axis, 0 < θ1 < 90°; 5. A multi-stage combined rectifier according to claim 1, characterized in that, There is an inclination angle θ2 between the middle of the first-stage flow guide vane and the flow channel central axis, 0 < θ2 < 90°; 6. A multi-stage combined rectifier according to claim 1, characterized in that, The diameter of the first rectification hole is d1, the diameter of the second rectification hole is d2, and d2 > d1; 7. A fluid pipeline system, characterized in that, Comprising the multi-stage combined rectifier according to any one of claims 1-6; 8. A fluid pipeline system according to claim 7, characterized in that, The multi-stage combined rectifier is located behind the flow disturbance component of the fluid pipeline system.

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