Sand quantity-adjustable sand separation pipe based on sand separation fins and design method of sand quantity-adjustable sand separation pipe

Abstract

The invention discloses a sand-quantity-adjustable sand separation pipe based on sand separation fins and a design method thereof. The sand-quantity-adjustable sand separation pipe comprises a vertical cylindrical sand separation pipe body, and at least two stages of sand separation units are evenly arranged on the inner wall of the sand separation pipe body in the axial direction; each stage of sand separation unit comprises a pair of rectangular sand separation holes symmetrically formed in the pipe wall of the sand separation pipe body, and Lambda-shaped sand separation fins are fixedly arranged in the centers of the rectangular sand separation holes; the width of the Lambda-shaped sand separation fin is equal to that of the rectangular sand separation hole, and the edges of the two sides of the Lambda-shaped sand separation fin are aligned with the lower edge of the rectangular sand separation hole, so that a continuous transition structure without steps is formed; and the sand separation proportion of each stage of sand separation unit is regulated and controlled by adjusting the length of the fin edge of the Lambda-shaped sand separation fin, the height of the rectangular sand separation hole and the width of the rectangular sand separation hole. Accurate control over the sand separation proportion of each stage can be achieved, uniform and non-uniform sand separation modes are supported, and the adaptability and engineering practicability of the sand separation pipe are improved.

Description

Technical Field

[0001] This invention relates to the field of fluid and particulate matter co-control devices, specifically to a sand distribution pipe with adjustable sand volume based on sand-distributing fins and its design method. Background Technology

[0002] In aerospace, environmental simulation, and materials durability testing, precise and controllable supply and distribution of sand or dust are frequently required. Traditional sand supply devices often employ uniformly distributed orifice plates, screens, or simple diverter valves, which easily lead to problems such as unadjustable sand distribution ratios, uneven flow, complex adjustment, and insufficient utilization of the gas-solid coupling effect. Existing adjustment methods rely on mechanical moving parts, resulting in complex structures, slow responses, and difficulty in achieving multi-stage continuous control. Therefore, there is an urgent need for a sand distribution pipe device with a simple structure, flexible adjustment, programmable control of the sand distribution ratio, and gas-solid coupling optimization capabilities to meet the high-precision and customizable requirements for particulate matter supply in modern scientific research and engineering testing. This has become a pressing technical problem to be solved. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a sand distribution pipe with adjustable sand distribution based on sand-distributing fins and its design method, solving the problems of non-adjustable sand distribution ratio, cumbersome adjustment methods, and poor flow uniformity in existing sand supply devices. By adjusting the geometric parameters of the sand-distributing fins, precise control of the sand distribution ratio at each stage can be achieved, supporting both uniform and non-uniform sand distribution modes, thus improving the adaptability and engineering practicality of the sand distribution pipe.

[0004] One embodiment of this application provides a sand distribution pipe with adjustable sand volume based on sand-distributing fins, comprising: A vertical cylindrical sand-distributing pipe body, wherein at least two levels of sand-distributing units are uniformly arranged along the axial direction on the inner wall of the sand-distributing pipe body; each level of sand-distributing unit includes a pair of rectangular sand-distributing holes symmetrically opened on the wall of the sand-distributing pipe body, and a Lambda-shaped ( ) is fixedly provided at the center of the rectangular sand-distributing holes. Lambda-shaped sand-splitting fin; the Lambda-shaped sand-splitting fin is integrally formed from two symmetrically inclined fins, which meet at the center of a rectangular sand-splitting hole, and the two ends of the fins are smoothly connected to the upper and lower edges of the rectangular sand-splitting hole respectively; the width of the Lambda-shaped sand-splitting fin is equal to the width of the rectangular sand-splitting hole, and the two side edges of the Lambda-shaped sand-splitting fin are aligned with the lower edge of the rectangular sand-splitting hole, forming a continuous transition structure without steps; The sand-distributing pipe body is installed vertically during operation. The sand flow enters from the top of the sand-distributing pipe body and flows down the pipe wall to the bottom. When the sand flow passes through the sand-distributing unit, the sand particles collide with the Lambda-shaped sand-distributing fins and are then discharged through the rectangular sand-distributing holes. Other sand particles continue to flow downward to the next level sand-distributing unit after a secondary collision in the pipe wall reflection zone. The sand-distributing ratio of each level of the sand-distributing unit is controlled by adjusting the fin edge length of the Lambda-shaped sand-distributing fins, the height of the rectangular sand-distributing holes, and the width of the rectangular sand-distributing holes.

[0005] Optionally, the angle between the Lambda-shaped sand-dividing fin and the cross-section of the sand-dividing pipe body... satisfy: in, D Indicates the internal diameter of the sand-dividing pipe body. L This indicates the length of the fin margin of the Lambda-shaped sand fin.

[0006] Optionally, the diameter of the reflective zone on the pipe wall is calculated as follows: in, Indicates the diameter of the reflective zone in the pipe wall. This indicates the height of the rectangular sand-dividing hole.

[0007] Optionally, the included angle of the small sector corresponding to the pipe wall reflection area is calculated in the following way: in, This indicates the included angle of the small sectors corresponding to the reflection zone of the pipe wall. This indicates the width of the rectangular sand-dividing hole.

[0008] Optionally, the effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing holes in each sand-dividing unit is calculated in the following way: in, This represents the effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing hole; The sand separation ratio of the sand separation unit is calculated as follows: in, This indicates the sand distribution ratio of the sand distribution unit, which is the proportion of the amount of sand flowing out of the sand distribution hole to the total amount of sand flowing in.

[0009] Optionally, when there is an airflow perpendicular to the axis of the sand-distributing pipe body and perpendicular to the plane connecting the rectangular sand-distributing holes, the airflow forms a cylindrical flow around the side wall of the sand-distributing pipe body, generating a negative pressure zone at the opening of the rectangular sand-distributing holes, which creates an adsorption effect on the sand particles.

[0010] Optionally, the axial spacing between the sand separating units can be adjusted within the range of 50mm-200mm.

[0011] Optionally, the sand-distributing pipe bodies can be combined to form a planar array structure, the planar array structure including at least two sand-distributing pipe bodies, and the sand-distributing ratio of each sand-distributing pipe body is independently controllable.

[0012] Optionally, the fin thickness of the Lambda-shaped split fin includes 1mm-3mm, and the fin surface is provided with a wear-resistant coating, which includes a titanium nitride coating and / or a tungsten carbide coating.

[0013] Another embodiment of this application provides a design method for a sand distribution pipe with adjustable sand volume based on sand distribution fins, used to design the sand distribution pipe as described above, including the following steps: Determine the inner diameter of the sand distribution pipe body. D、 The number of sand-splitting units is determined, and the fin edge length of the Lambda-shaped sand-splitting fin is set. L、 Height of rectangular sand dividing hole and the width of the rectangular sand-dividing holes ; The angle between the Lambda-shaped sand-dividing fin and the cross-section of the sand-dividing pipe body is calculated using the first formula. The first formula is: Calculate the diameter of the reflection zone in the pipe wall using the second formula. The second formula is ; Calculate the included angle of the small sector corresponding to the reflection zone of the pipe wall using the third formula. The third formula is: ; The fourth formula is used to calculate the effective sand-distributing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-distributing holes in each sand-distributing unit. The fourth formula is: ; The sand separation ratio of each sand separation unit is calculated using the fifth formula. The fifth formula is as follows:

[0014] Combined with the inner diameter of the sand-dividing pipe body D、 The number of sand-splitting units and the fin side length of the Lambda-shaped sand-splitting fin. L、 Height of rectangular sand dividing hole and the width of the rectangular sand-dividing holes And based on the calculated angle between the Lambda-shaped sand-dividing fin and the cross-section of the sand-dividing pipe body. The diameter of the pipe wall reflective zone The included angle of the small sector corresponding to the pipe wall reflection area The effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing hole. and the sand separation ratio of each sand separation unit. Complete the structural design of the sand distribution pipe.

[0015] Compared with the prior art, the present invention provides a sand-distributing pipe with adjustable sand volume based on sand-distributing fins, comprising a vertical cylindrical sand-distributing pipe body, wherein at least two levels of sand-distributing units are uniformly arranged along the axial direction on the inner wall of the sand-distributing pipe body; each level of sand-distributing unit includes a pair of rectangular sand-distributing holes symmetrically opened on the pipe wall of the sand-distributing pipe body, wherein a Lambda-shaped ( The Lambda-shaped sand-dividing fin is integrally formed from two symmetrically inclined fins that converge at the center of a rectangular sand-dividing hole. The two ends of the fins smoothly transition to the upper and lower edges of the rectangular sand-dividing hole. The width of the Lambda-shaped sand-dividing fin is equal to the width of the rectangular sand-dividing hole, and the two side edges of the Lambda-shaped sand-dividing fin are aligned with the lower edge of the rectangular sand-dividing hole, forming a continuous transition structure without steps. The sand-dividing pipe body is installed vertically during operation. The sand flow enters from the top of the sand-dividing pipe body and flows down the pipe wall to the bottom. When the sand flow passes through the sand-dividing unit, the sand particles collide with the Lambda-shaped sand-dividing fin and are discharged along the rectangular sand-dividing hole. Other sand particles collide a second time in the pipe wall reflection zone and continue to flow downwards to the next sand-dividing unit. The sand-dividing ratio of each level of the sand-dividing unit is controlled by adjusting the fin edge length of the Lambda-shaped sand-dividing fin, the height of the rectangular sand-dividing hole, and the width of the rectangular sand-dividing hole. It can achieve precise control of the sand distribution ratio at each level, supports uniform and non-uniform sand distribution modes, and improves the adaptability and engineering practicality of the sand distribution pipe. Attached Figure Description

[0016] Figure 1 A schematic diagram of a sand-distributing pipe with adjustable sand volume based on sand-distributing fins is provided for an embodiment of this application; Figure 2 This is a schematic diagram of the parameters of the sand-fin region provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of a planar array sand-dividing tube array provided in an embodiment of the present invention; Figure 4 This invention provides a design method for a sand distribution pipe with adjustable sand volume based on sand distribution fins. Detailed Implementation

[0017] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] SeeFigure 1 , Figure 1 This is a schematic diagram of a sand-distributing pipe with adjustable sand volume based on sand-distributing fins, provided in an embodiment of this application. Figure 1 Displaying sand-dividing pipes, rectangular sand-dividing holes, and Lambda-shaped sand-dividing fins ( The relative positional relationship of shapes.

[0019] The sand-distributing pipe with adjustable sand volume based on sand-distributing fins may include a vertical cylindrical sand-distributing pipe body. At least two levels of sand-distributing units are uniformly arranged axially on the inner wall of the sand-distributing pipe body. Each level of sand-distributing unit includes a pair of rectangular sand-distributing holes symmetrically opened on the pipe wall of the sand-distributing pipe body. A Lambda-shaped sand-distributing fin is fixedly installed at the center of each rectangular sand-distributing hole. The Lambda-shaped sand-distributing fin is integrally formed from two symmetrically inclined fins that converge at the center of the rectangular sand-distributing hole. The two ends of the fins are smoothly connected to the upper and lower edges of the rectangular sand-distributing hole. The width of the Lambda-shaped sand-distributing fin is proportional to the width of the rectangular sand-distributing hole. The holes are all the same width, and the two sides of the Lambda-shaped sand-dividing fin are aligned with the lower edge of the rectangular sand-dividing hole, forming a continuous transition structure without steps. The sand-dividing pipe body is installed vertically during operation. The sand flow flows in from the top of the sand-dividing pipe body and flows down the pipe wall to the bottom. When the sand flow passes through the sand-dividing unit, the sand particles collide with the Lambda-shaped sand-dividing fin and are discharged along the rectangular sand-dividing hole. Other sand particles continue to flow downward to the next level sand-dividing unit after a secondary collision in the pipe wall reflection area. The sand-dividing ratio of each level of the sand-dividing unit is controlled by adjusting the fin edge length of the Lambda-shaped sand-dividing fin, the height of the rectangular sand-dividing hole, and the width of the rectangular sand-dividing hole.

[0020] Specifically, the angle between the Lambda-shaped sand-distributing fin and the cross-section of the sand-distributing pipe body... satisfy: in, D Indicates the internal diameter of the sand-dividing pipe body. L This indicates the length of the fin margin of the Lambda-shaped sand fin.

[0021] Specifically, the diameter of the reflective zone on the pipe wall is calculated as follows: in, Indicates the diameter of the reflective zone in the pipe wall. This indicates the height of the rectangular sand-dividing hole.

[0022] Specifically, the included angle of the small sector corresponding to the pipe wall reflection area is calculated in the following way: in, This indicates the included angle of the small sectors corresponding to the reflection zone of the pipe wall. This indicates the width of the rectangular sand-dividing hole.

[0023] See Figure 2 , Figure 2 This is a schematic diagram of the parameters of the sand-fin region provided in an embodiment of the present invention. Figure 2 The key geometric parameters of the sand-splitting fin are marked in the middle, including the fin side length of the Lambda-shaped sand-splitting fin. L Height of rectangular sand dividing holes Width of rectangular sand dividing holes , inner diameter of sand distribution pipe body D、 Pipe wall reflective zone diameter The angle between the Lambda-shaped sand-dividing fin and the cross-section of the sand-dividing pipe body and the included angle of the small sector corresponding to the reflection area of ​​the pipe wall And their geometric relationships.

[0024] Specifically, the effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing holes in each sand-dividing unit is calculated as follows: in, This represents the effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing hole; The sand separation ratio of the sand separation unit is calculated as follows: in, This indicates the sand distribution ratio of the sand distribution unit, which is the proportion of the amount of sand flowing out of the sand distribution hole to the total amount of sand flowing in.

[0025] Specifically, when there is airflow perpendicular to the axis of the sand-distributing pipe body and perpendicular to the plane connecting the rectangular sand-distributing holes, the airflow forms a cylindrical flow around the side wall of the sand-distributing pipe body, generating a negative pressure zone at the orifice of the rectangular sand-distributing holes, which creates an adsorption effect on the sand particles.

[0026] Specifically, the axial spacing adjustment range between the sand separating units includes 50mm-200mm.

[0027] Specifically, the sand-distributing pipe bodies can be combined to form a planar array structure, which includes at least two sand-distributing pipe bodies, and the sand-distributing ratio of each sand-distributing pipe body is independently controllable.

[0028] See Figure 3 , Figure 3 This is a schematic diagram of a planar array sand distribution tube array provided in an embodiment of the present invention, which shows a two-dimensional programmable sand supply surface structure formed by combining multiple sand distribution tubes.

[0029] For example, in order to realize an arrayed sand supply system, eight of the above-mentioned sand distribution pipes can be arranged along a vertical plane, with each sand distribution pipe having four levels of sand distribution units, thereby constructing a sand supply surface with specific spatial distribution characteristics to meet the requirements of complex wind field and particulate matter coupling experiments.

[0030] Specifically, the fin thickness of the Lambda-shaped split fin includes 1mm-3mm, and the surface of the fin is provided with a wear-resistant coating, which includes a titanium nitride coating and / or a tungsten carbide coating.

[0031] For example, a sand-distributing pipe with adjustable sand volume based on sand-distributing fins includes a vertically cylindrical sand-distributing pipe with multiple sand-distributing units uniformly arranged along the axial direction on its inner wall. Each sand-distributing unit includes a pair of rectangular sand-distributing holes opened on the pipe wall, with a Λ-shaped sand-distributing fin positioned at the center of each hole. The Λ-shaped sand-distributing fin consists of two symmetrically inclined fins that meet at the center of the hole, with both ends of the fins smoothly connected to the upper and lower edges of the sand-distributing hole. The width of the sand-distributing fin is equal to the width of the sand-distributing hole, and the two side edges of the sand-distributing fin are aligned with the lower edge of the sand-distributing hole, forming a continuous transition structure. When the sand-distributing pipe is in operation, it is installed vertically, and the sand flows in from the top of the pipe and flows along the pipe wall towards... Bottom flow: When the sand flow enters the sand-dividing fin area, some sand particles do not collide with the fins and flow directly downwards through the sand-dividing hole area; other sand particles collide with the sand-dividing fins and, guided by their tilt angle, are discharged out of the sand-dividing pipe along the direction of the sand-dividing hole; the remaining sand particles after the collision undergo a secondary collision in the pipe wall reflection zone, bounce off, and continue to flow downwards along the pipe wall until they enter the next level sand-dividing unit; multiple levels of sand-dividing units can be set inside the sand-dividing pipe, and the spacing between each level of sand-dividing units is adjustable; the sand-dividing ratio of each level of sand-dividing unit can be controlled by adjusting its key design parameters, which may include the fin edge length L, the sand-dividing hole height t, and the sand-dividing hole width W. When there is an airflow perpendicular to the sand-dividing pipe axis and perpendicular to the plane connecting the sand-dividing holes, this airflow forms a cylindrical flow around the side wall of the sand-dividing pipe, generating a negative pressure zone at the orifice, which has an adsorption effect on the sand particles, promoting the smooth flow of sand particles from the sand-dividing holes, improving sand supply efficiency and flow stability.

[0032] The present invention has the following significant advantages: 1. Adjustable sand separation ratio: By adjusting the three design parameters L, t, and W, the sand separation ratio of any level can be flexibly configured to achieve uniform or non-uniform sand separation; 2. Simple structure and low cost: It adopts a combination of Λ-shaped sand-splitting fins and rectangular holes, with no moving parts and a mature manufacturing process; 3. Gas-solid coupling optimization: Utilizing the negative pressure effect generated by airflow around the sand particles, the sand particle removal capacity is enhanced, and the sand supply efficiency is improved; 4. High scalability: A single sand distribution pipe can be expanded into an array structure to support particle supply with complex spatial distribution, and is suitable for multiple scenarios such as wind tunnels, sand and dust test chambers, and field simulations; 5. Easy to manufacture and debug: Supports multiple processes such as 3D printing, laser cutting, and sheet metal welding; in actual use, fine-tuning can be performed by cutting the Λ-shaped structure to achieve high-precision matching; 6. Clear theoretical guidance: The mathematical model is established based on the ideal spherical elastic body model, providing a reliable design basis. In practical applications, only experimental correction is needed to meet engineering requirements.

[0033] As can be seen, the present invention provides a sand-distributing pipe with adjustable sand volume based on sand-distributing fins, comprising a vertical cylindrical sand-distributing pipe body, wherein at least two levels of sand-distributing units are uniformly arranged along the axial direction on the inner wall of the sand-distributing pipe body; each level of sand-distributing unit includes a pair of rectangular sand-distributing holes symmetrically opened on the pipe wall of the sand-distributing pipe body, wherein a Lambda-shaped ( The Lambda-shaped sand-dividing fin is integrally formed from two symmetrically inclined fins that converge at the center of a rectangular sand-dividing hole. The two ends of the fins smoothly transition to the upper and lower edges of the rectangular sand-dividing hole. The width of the Lambda-shaped sand-dividing fin is equal to the width of the rectangular sand-dividing hole, and the two side edges of the Lambda-shaped sand-dividing fin are aligned with the lower edge of the rectangular sand-dividing hole, forming a continuous transition structure without steps. The sand-dividing pipe body is installed vertically during operation. The sand flow enters from the top of the sand-dividing pipe body and flows down the pipe wall to the bottom. When the sand flow passes through the sand-dividing unit, the sand particles collide with the Lambda-shaped sand-dividing fin and are discharged along the rectangular sand-dividing hole. Other sand particles collide a second time in the pipe wall reflection zone and continue to flow downwards to the next sand-dividing unit. The sand-dividing ratio of each level of the sand-dividing unit is controlled by adjusting the fin edge length of the Lambda-shaped sand-dividing fin, the height of the rectangular sand-dividing hole, and the width of the rectangular sand-dividing hole. It can achieve precise control of the sand distribution ratio at each level, supports uniform and non-uniform sand distribution modes, and improves the adaptability and engineering practicality of the sand distribution pipe.

[0034] See Figure 4 , Figure 4 A design method for a sand-dividing pipe with adjustable sand volume based on sand-dividing fins, provided in this embodiment of the invention, is used to design the sand-dividing pipe as described above, and includes the following steps: S401: Determine the inner diameter of the sand distribution pipe body. D、 The number of sand-splitting units is determined, and the fin edge length of the Lambda-shaped sand-splitting fin is set. L、 Height of rectangular sand dividing hole and the width of the rectangular sand-dividing holes ; S402: Calculate the angle between the Lambda-shaped sand-distributing fin and the cross-section of the sand-distributing pipe body using the first formula. The first formula is: S403: Calculate the diameter of the pipe wall reflection zone using the second formula. The second formula is ; S404: Calculate the included angle of the small sector corresponding to the reflection zone of the pipe wall using the third formula. The third formula is: ; S405: Calculate the effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing holes in each sand-dividing unit using the fourth formula. The fourth formula is: ; S406: Calculate the sand separation ratio of each sand separation unit using the fifth formula. The fifth formula is as follows:

[0035] S407: Combined with the inner diameter of the sand-distributing pipe body D、 The number of sand-splitting units and the fin side length of the Lambda-shaped sand-splitting fin. L、 Height of rectangular sand dividing hole and the width of the rectangular sand-dividing holes And based on the calculated angle between the Lambda-shaped sand-dividing fin and the cross-section of the sand-dividing pipe body. The diameter of the pipe wall reflective zone The included angle of the small sector corresponding to the pipe wall reflection area The effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing hole. and the sand separation ratio of each sand separation unit. Complete the structural design of the sand distribution pipe.

[0036] It should be noted that when designing sand distribution pipes, two design variables, such as L and t, can be pre-defined based on the target sand distribution ratio. The third variable, W, can then be calculated using the formula described above to obtain the structural parameters of the sand distribution pipe that meet specific sand distribution requirements. In practical applications, the final parameters meeting engineering accuracy can be obtained through a combination of experimental testing and correction.

[0037] For example, to achieve the design of a five-stage uniform sand distribution pipe, the design parameters are as follows: Inner diameter of the sand separator pipe ; Number of sand separation units: 5 levels; The required sand separation ratio is as follows: 1 / 5 for the first stage, 1 / 4 for the second stage, 1 / 3 for the third stage, 1 / 2 for the fourth stage, and all (i.e., 100%) for the fifth stage, with a remaining amount of 0. Setting: Length of the sand-splitting fin edge Sand dividing hole height The sand separation ratio is controlled by adjusting the width W of the sand separation hole; Calculate the width of each sand distribution hole according to the formula: Level 1: Solving for ; Level 2: Solving for ; Level 3: Solving for ; Level 4: Solving for ; Level 5: The width of the sand-dividing fin can be set to be equal to 20mm of the inner diameter of the pipe, completely covering the orifice and forcing all the sand particles to flow out of the hole, or the 5th stage can be canceled to allow the sand particles to be discharged naturally from the bottom.

[0038] It should be noted that the manufacturing process of the aforementioned sand-distributing pipe can be directly formed using 3D printing technology, or the sand-distributing holes can be laser-cut, followed by sheet metal bending and welding to assemble the Λ-shaped sand-distributing fins. By setting key dimensional parameters, such as L, t, and W, the error should be controlled within ±0.1mm. In practical applications, if the measured sand-distribution ratio is higher than the design value, the sand-distributing fins can be slightly adjusted towards the pipe wall; if it is lower than the design value, the sand-distributing fins can be slightly adjusted towards the center. Quick adjustments can be made by observing the flow channel state by cutting open the midpoint of the Λ-shaped structure. For high-precision requirements, a mass flow meter can be installed at the outlet of the sand-distributing pipe for measurement calibration.

[0039] As can be seen, this application determines the inner diameter of the sand-distributing pipe body. D、 The number of sand-splitting units is determined, and the fin edge length of the Lambda-shaped sand-splitting fin is set. L、 Height of rectangular sand dividing hole and the width of the rectangular sand-dividing holes The angle between the Lambda-shaped sand-dividing fin and the cross-section of the sand-dividing pipe body is calculated using the first formula. ; Calculate the diameter of the reflection zone in the pipe wall using the second formula. The included angle of the small sector corresponding to the reflection zone of the pipe wall is calculated using the third formula. The fourth formula is used to calculate the effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing holes in each sand-dividing unit. The sand separation ratio of each sand separation unit is calculated using the fifth formula. Finally, combined with the inner diameter of the sand distribution pipe body D、 The number of sand-splitting units and the fin side length of the Lambda-shaped sand-splitting fin. L、 Height of rectangular sand dividing hole and the width of the rectangular sand-dividing holes And based on the calculated angle between the Lambda-shaped sand-dividing fin and the cross-section of the sand-dividing pipe body. The diameter of the pipe wall reflective zone The included angle of the small sector corresponding to the pipe wall reflection area The effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing hole. and the sand separation ratio of each sand separation unit. The structural design of the sand distribution pipe is completed. It can achieve precise control of the sand distribution ratio at each stage by adjusting the geometric parameters of the sand distribution fins, supports uniform and non-uniform sand distribution modes, and improves the adaptability and engineering practicality of the sand distribution pipe.

[0040] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0041] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0042] In the several embodiments provided by this invention, it should be understood that the disclosed apparatus can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical or other forms.

[0043] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0044] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0045] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A sand distribution pipe with adjustable sand volume based on sand-distributing fins, characterized in that, include: A vertical cylindrical sand-distributing pipe body, wherein at least two levels of sand-distributing units are uniformly arranged along the axial direction on the inner wall of the sand-distributing pipe body; each level of sand-distributing unit includes a pair of rectangular sand-distributing holes symmetrically opened on the wall of the sand-distributing pipe body, and a Lambda-shaped ( ) is fixedly provided at the center of the rectangular sand-distributing holes. Lambda-shaped sand-splitting fin; the Lambda-shaped sand-splitting fin is integrally formed from two symmetrically inclined fins, which meet at the center of a rectangular sand-splitting hole, and the two ends of the fins are smoothly connected to the upper and lower edges of the rectangular sand-splitting hole respectively; the width of the Lambda-shaped sand-splitting fin is equal to the width of the rectangular sand-splitting hole, and the two side edges of the Lambda-shaped sand-splitting fin are aligned with the lower edge of the rectangular sand-splitting hole, forming a continuous transition structure without steps; The sand-distributing pipe body is installed vertically during operation. The sand flow enters from the top of the sand-distributing pipe body and flows down the pipe wall to the bottom. When the sand flow passes through the sand-distributing unit, the sand particles collide with the Lambda-shaped sand-distributing fins and are discharged along the rectangular sand-distributing holes. Other sand particles continue to flow downward to the next level sand-distributing unit after a secondary collision in the pipe wall reflection zone. The sand distribution ratio of each level of the sand-distributing unit is controlled by adjusting the fin edge length of the Lambda-shaped sand-distributing fins, the height of the rectangular sand-distributing holes, and the width of the rectangular sand-distributing holes.

2. The sand separating pipe according to claim 1, characterized in that, The angle between the Lambda-shaped sand-splitting fin and the cross-section of the sand-splitting pipe body satisfy: in, D Indicates the internal diameter of the sand-dividing pipe body. L This indicates the length of the fin margin of the Lambda-shaped sand fin.

3. The sand separating pipe according to claim 2, characterized in that, The diameter of the reflective zone in the pipe wall is calculated as follows: in, Indicates the diameter of the reflective zone in the pipe wall. This indicates the height of the rectangular sand-dividing hole.

4. The sand separating pipe according to claim 3, characterized in that, The included angle of the small sector corresponding to the pipe wall reflection area is calculated in the following way: in, This indicates the included angle of the small sectors corresponding to the reflection zone of the pipe wall. This indicates the width of the rectangular sand-dividing hole.

5. The sand separating pipe according to claim 4, characterized in that, The effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing holes in each sand-dividing unit is calculated as follows: in, This represents the effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing hole; The sand separation ratio of the sand separation unit is calculated as follows: in, This indicates the sand distribution ratio of the sand distribution unit, which is the proportion of the amount of sand flowing out of the sand distribution hole to the total amount of sand flowing in.

6. The sand separating pipe according to claim 1, characterized in that, When there is airflow perpendicular to the axis of the sand-distributing pipe body and perpendicular to the plane connecting the rectangular sand-distributing holes, the airflow forms a cylindrical flow around the side wall of the sand-distributing pipe body, generating a negative pressure zone at the opening of the rectangular sand-distributing holes, which creates an adsorption effect on the sand particles.

7. The sand separating pipe according to claim 1, characterized in that, The axial spacing between the sand separating units can be adjusted from 50mm to 200mm.

8. The sand separating pipe according to claim 1, characterized in that, The sand-distributing pipe bodies can be combined to form a planar array structure, which includes at least two sand-distributing pipe bodies, and the sand-distributing ratio of each sand-distributing pipe body is independently controllable.

9. The sand separating pipe according to claim 1, characterized in that, The thickness of the Lambda-shaped sand-splitting fins ranges from 1mm to 3mm, and the surface of the fins is provided with a wear-resistant coating, which includes a titanium nitride coating and / or a tungsten carbide coating.

10. A design method for a sand-dividing pipe with adjustable sand volume based on sand-dividing fins, used to design the sand-dividing pipe as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Determine the inner diameter of the sand distribution pipe body. D、 The number of sand-splitting units is determined, and the fin edge length of the Lambda-shaped sand-splitting fin is set. L、 Height of rectangular sand dividing hole and the width of the rectangular sand-dividing holes ; The angle between the Lambda-shaped sand-dividing fin and the cross-section of the sand-dividing pipe body is calculated using the first formula. The first formula is: Calculate the diameter of the reflection zone in the pipe wall using the second formula. The second formula is ; Calculate the included angle of the small sector corresponding to the reflection zone of the pipe wall using the third formula. The third formula is: ; The fourth formula is used to calculate the effective sand-distributing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-distributing holes in each sand-distributing unit. The fourth formula is: ; The sand separation ratio of each sand separation unit is calculated using the fifth formula. The fifth formula is as follows: ; Combined with the inner diameter of the sand-dividing pipe body D、 The number of sand-splitting units and the fin side length of the Lambda-shaped sand-splitting fin. L、 Height of rectangular sand dividing hole and the width of the rectangular sand-dividing holes And based on the calculated angle between the Lambda-shaped sand-dividing fin and the cross-section of the sand-dividing pipe body. The diameter of the reflective zone of the pipe wall The included angle of the small sector corresponding to the reflection area of ​​the pipe wall The effective sand-dividing area of ​​the cross-section corresponding to the sand particles flowing out of the rectangular sand-dividing hole. and the sand separation ratio of each sand separation unit. Complete the structural design of the sand distribution pipe.

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