Overflow structure for adjusting forward and reverse flow resistance

Abstract

The invention discloses an overflowing structure for adjusting forward and reverse flow resistance, and relates to the technical field of fluid conveying devices. The overflowing structure comprises a runner main body and an overflowing part, the overflowing part is arranged in the runner main body, the overflowing part is provided with a first surface, a second surface and a third surface, the first surface is sunken in the direction away from the axis of the overflowing part, the second surface is sunken in the direction away from the axis of the overflowing part, and the third surface is sunken in the direction close to the axis of the overflowing part. By fixedly arranging the overflowing piece in the runner body, the hydraulic loss coefficient of fluid in the downstream direction and the hydraulic loss coefficient of fluid in the countercurrent direction can be different, the hydraulic loss coefficient in the downstream direction is reduced, the hydraulic loss coefficient in the countercurrent direction is increased, the downstream and countercurrent hydraulic loss coefficient is variable along with the flow speed, and the downstream and countercurrent resistance ratio is adjustable along with the size; in addition, the overflowing part can be designed in a standardized mode, produced in batches, not prone to damage, long in service life, good in use reliability and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid conveying devices, and in particular to a flow-through structure for adjusting forward and reverse flow resistance. Background Art

[0002] In related technologies, in order to achieve the effect of adjusting the forward and reverse flow resistance, mechanical moving parts, electronic control units, etc. are usually required to be installed in the flow channel body. Mechanical moving parts and electronic control units are difficult to adjust, difficult to process and easy to damage, and have poor reliability and high cost. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a flow structure for adjusting forward and reverse flow resistance, wherein the flow structure can make the hydraulic loss coefficient of the fluid in the downstream direction and the reverse direction different.

[0004] According to an embodiment of the present invention, a flow structure for adjusting forward and reverse flow resistance includes: a flow channel body and a flow member, the flow member is arranged in the flow channel body and is spaced apart from the inner wall of the flow channel body to form a flow channel; along the axial direction of the flow member, the flow member has a downstream end and a downstream end relative to each other, the flow member has a first surface, a second surface, and a third surface, the first surface is constructed as an arc surface and is recessed in the axial direction away from the flow member; one end of the second surface is connected to one end of the first surface close to the downstream end, the other end of the second surface extends toward the downstream end, the second surface is constructed as an arc surface and is located on the inner side of the first surface, and the second surface is recessed in the axial direction away from the flow member; one end of the third surface is connected to the other end of the second surface, the other end of the third surface extends toward the downstream end, the third surface is constructed as an arc surface and is located on the inner side of the second surface, and the third surface is recessed in the axial direction close to the flow member.

[0005] According to the flow-through structure for adjusting forward and reverse flow resistance in an embodiment of the present invention, by fixing the flow-through piece proposed in this application in the flow channel body, the hydraulic loss coefficient of the fluid in the downstream direction and the upstream direction can be made different, thereby reducing the hydraulic loss coefficient in the downstream direction and improving the hydraulic loss coefficient in the upstream direction. The downstream and upstream hydraulic loss coefficients are variable with the flow rate, and the downstream and upstream resistance ratio is adjustable with the size. In addition, the flow-through piece can be designed in a standardized manner and mass-produced, is not easily damaged, has a long service life, has good reliability in use and is low in cost.

[0006] According to some embodiments of the present invention, the first surface is configured as a partial elliptical surface, and the major axis of the first surface is coaxial with the axis of the flow member. The curve equation of the first surface is: Wherein, b is the minor axis size of the first surface.

[0007] According to some embodiments of the present invention, the second surface is configured as a partial ellipse, the major axis of the second surface is parallel to the axis of the flow member, and the ellipse equation of the second surface is:

[0008] According to some embodiments of the present invention, the major axis of the first surface is a, satisfying the relationship: a=3b.

[0009] According to some embodiments of the present invention, the major axis of the second surface is c, and the minor axis is d, satisfying the relationship: c=0.8b, d=0.4b.

[0010] According to some embodiments of the present invention, the generatrix of the second surface is tangently continuous at a connection point between an end of the second surface close to the third surface and the third surface, and the position of the connection point satisfies the relationship: x3=0.6b, y3=0.8b.

[0011] According to some embodiments of the present invention, the radius of the third surface is e, satisfying the relationship e=3b.

[0012] According to some embodiments of the present invention, the first surface and the second surface transition through a fourth surface, and the width f of the fourth surface satisfies the relationship: f=0.01b; and / or, the flow-through member further has a fifth surface, which is connected to the other end of the third surface, and the fifth surface is constructed as an arc surface and the width g satisfies the relationship: g=0.05b.

[0013] According to some embodiments of the present invention, the length of the flow channel body is D, the length of the flow member along the radial direction of the flow member is 2b, and the hydraulic loss coefficient ζ1 in the downstream direction and the hydraulic loss coefficient ζ2 in the upstream direction of the flow structure satisfy the relationship:

[0014] According to some embodiments of the present invention, the diameter of the flow channel body is D, the length of the flow member along the axis of the flow member is 2b, the fluid flow velocity in the flow channel body is u, and the hydraulic loss coefficient of the flow structure in the downstream direction is ζ1, satisfying the relationship:

[0015] According to some embodiments of the present invention, the width of the flow channel body is D, the length of the flow passage along the axis of the flow passage is 2b, the fluid flow velocity in the flow channel body is u, and the hydraulic loss coefficient of the flow passage structure in the reverse flow direction is ζ2, satisfying the relationship:

[0016] According to some embodiments of the present invention, the flow-through structure further includes: a connecting member connected between the inner wall of the flow channel body and the flow-through member.

[0017] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0019] Figure 1 is a schematic diagram of a flow-through structure according to an embodiment of the present invention (flow channel main body perspective);

[0020] Figure 2 is a schematic cross-sectional view of a flow-through structure according to an embodiment of the present invention;

[0021] Figure 3 is a schematic cross-sectional view of a flow-through member according to an embodiment of the present invention;

[0022] Figure 4 yes Figure 3 An enlarged schematic diagram at point A;

[0023] Figure 5 yes Figure 3 Enlarged schematic diagram at B.

[0024] Reference numerals:

[0025] Runner body 1;

[0026] Flow member 2; first surface 21; second surface 22; third surface 23; fourth surface 24; fifth surface 25; downstream end 26; upstream end 27;

[0027] flow channel 3;

[0028] Over-current structure 10. DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] The following describes a flow-through structure 10 for adjusting forward and reverse flow resistance according to an embodiment of the present invention with reference to the accompanying drawings.

[0031] like Figure 1 and Figure 2As shown, according to an embodiment of the present invention, a flow structure 10 for adjusting forward and reverse flow resistance includes: a flow channel body 1 and a flow member 2, the flow member 2 is arranged in the flow channel body 1 and is spaced apart from the inner wall of the flow channel body 1 to form a flow channel 3, along the axial direction of the flow member 2, the flow member 2 has a downstream end 26 and an upstream end 27 relative to each other, the flow member 2 has a first surface 21, a second surface 22, and a third surface 23, the first surface 21 is constructed as an arc surface and is concave in the direction away from the axial direction of the flow member 2, and one end of the second surface 22 is The second surface 22 is connected to one end of the first surface 21 close to the upstream end 27, and the other end of the second surface 22 extends toward the downstream end 26. The second surface 22 is constructed as an arc surface and is located on the inner side of the first surface 21. The second surface 22 is recessed in the axial direction away from the flow member 2. One end of the third surface 23 is connected to the other end of the second surface 22, and the other end of the third surface 23 extends toward the upstream end 27. The third surface 23 is constructed as an arc surface and is located on the inner side of the second surface 22. The third surface 23 is recessed in the axial direction close to the flow member 2.

[0032] The flow channel body 1 can be constructed as a tubular structure having a cavity within which a fluid can flow. A flow member 2 is disposed within the flow channel body 1 and can be constructed as a solid structure or a thick-walled structure. The flow member 2 can be constructed as a symmetrical structure along the plane of the axial direction, with the axis of symmetry of the flow member 2 coinciding with the central axis of the flow channel body 1, such that the flow member 2 is located at the center of the flow channel body 1 in the radial direction of the flow channel body 1.

[0033] The central axis of the flow member 2 can coincide with the central axis of the flow channel body 1. The flow member 2 has a downstream end 26 and an upstream end 27 opposite to each other. The fluid flows from the downstream end 26 to the upstream end 27 in the downstream direction, and the fluid flows from the upstream end 27 to the downstream end 26 in the upstream direction.

[0034] The inner wall of the flow channel main body 1 can be separated from the flow member 2. As some embodiments of the present invention, the flow channel main body 1 and the flow member 2 are fixedly connected by connecting parts. The connecting parts can be constructed as wing plates, ribs, etc. By fixing the flow channel main body 1 and the flow member 2, the flow channel main body 1 and the flow member 2 can be made relatively stationary, thereby replacing the design in the related art that achieves the effect of adjusting the forward and reverse flow resistance through movable parts, external control (including: check valves, guide holes, electronic control units, etc.). The present application simplifies the geometric configuration within the flow structure 10 so that there are no mechanical moving parts and no electronic control units in the flow structure 10 (mechanical moving parts and no electronic control units are difficult to maintain and easy to damage compared to the flow member 2). The effect of adjusting the forward and reverse flow resistance can be achieved only through the shape of the flow member 2 and the relative position relationship between the flow member 2 and the flow channel main body 1, which is conducive to making the layout within the flow channel main body 1 simple. In addition, the geometric parameters of the flow-through piece 2 can be designed in a standardized manner, and the flow-through piece 2 can adapt to engineering requirements of different pipe diameter specifications. During installation, it is only necessary to make the flow-through piece 2 strictly parallel to the central axis of the flow channel body 1 without additional adjustment. The assembly is simple and it is beneficial to improve the controllability of fluid pressure loss.

[0035] The first surface 21 of the flow member 2 is constructed as an arc surface, which can be a circular arc surface, an elliptical surface, etc. The first surface 21 is recessed in a direction away from the axis of the flow member 2, so that the first surface 21 is constructed as a streamlined flow-guiding surface. Along the downstream direction, the distance between the flow member 2 and the inner wall of the flow channel body 1 gradually decreases, so that the cross-sectional area of the flow channel 3 gradually decreases. When the fluid flows through the flow channel 3 in the downstream direction, the flow trajectory of the fluid continuously adapts to the geometric shape of the first surface 21, so that the fluid can maintain a stable attached flow state. By providing the first surface 21, the local flow velocity differences of the fluid during downstream flow can be weakened, achieving the effect of reducing the energy dissipation rate, thereby facilitating the reduction of the hydraulic loss coefficient.

[0036] One end of the second surface 22 is connected to one end of the first surface 21 close to the upstream end 27, and the other end of the second surface 22 extends toward the downstream end 26. The second surface 22 is constructed as an arc surface, which can be a circular arc surface, an elliptical surface, etc. The second surface 22 is located on the inner side of the first surface 21, and the second surface 22 is recessed in the axial direction away from the flow-through member 2. One end of the third surface 23 is connected to the other end of the second surface 22, and the other end of the third surface 23 extends toward the upstream end 27. The third surface 23 is constructed as an arc surface, which can be a circular arc surface, an elliptical surface, etc. The third surface 23 is located on the inner side of the second surface 22, and the third surface 23 is recessed in the axial direction close to the flow-through member 2.

[0037] When the fluid flows in the countercurrent direction to the end of the first surface 21 close to the second surface 22 or the end of the third surface 23 away from the second surface 22, the geometric differences among the first surface 21, the second surface 22, and the third surface 23 can induce part of the fluid to form a vortex opposite to the mainstream direction, thereby alienating the spatial velocity distribution of the fluid, thereby increasing the migration distance of the fluid, strengthening the internal friction of the fluid, and thereby changing the flow state of the fluid. Compared with the fluid flowing in the downstream direction, the fluid flowing in the countercurrent direction has a greater flow resistance, a greater energy dissipation rate, and a greater hydraulic loss coefficient.

[0038] It can be understood that the present application designs the extension direction and the recessed direction of the first surface 21, the second surface 22, and the third surface 23 so that the energy dissipation rate of the fluid when flowing in the downstream direction is smaller and the energy dissipation rate when flowing in the countercurrent direction is larger, so that the flow velocity of the fluid flowing in the downstream direction and the countercurrent direction is different, and the hydraulic loss coefficient of the fluid in the downstream direction and the countercurrent direction is different, so that the flow structure 10 can be suitable for application scenarios where the downstream flow resistance and the countercurrent flow resistance are different.

[0039] It should be noted that if Figure 3 As shown, one end of the third surface 23 close to the second surface 22 is connected to the end of the second surface 22 close to the third surface 23. When the fluid flows from the upstream end 27 to the downstream end 26, near the connection between the second surface 22 and the third surface 23, the second surface 22 guides the first part of the fluid to flow in the direction C, and the third surface 23 guides the second part of the fluid to flow in the direction D. The first part of the fluid and the second part of the fluid impact each other to further increase the flow resistance, increase the energy dissipation rate, and increase the hydraulic loss coefficient.

[0040] In the above embodiment, by fixing the flow-through piece 2 proposed in the present application in the flow channel main body 1, the hydraulic loss coefficients of the fluid in the downstream direction and the upstream direction can be made different, thereby reducing the hydraulic loss coefficient in the downstream direction and improving the hydraulic loss coefficient in the upstream direction. The downstream and upstream hydraulic loss coefficients can be changed with the flow rate, and the downstream and upstream resistance ratio can be adjusted with the size. In addition, the flow-through piece 2 can be designed in a standardized manner and mass-produced, is not easy to be damaged, has a long service life, has good reliability and is low in cost.

[0041] In some embodiments of the present invention, Figure 3 As shown, the first surface 21 is constructed as a partial elliptical surface, and the major axis of the first surface 21 is coaxial with the axis of the flow member 2. The curve equation of the first surface 21 is: Wherein, b is the minor axis dimension of the first surface 21 .

[0042] Specifically, the first surface 21 can be constructed as a partial elliptical surface, and the major axis of the first surface 21 is coaxial with the axis of the flow member 2, and the first surface 21 satisfies the elliptical curve equation: Where b is the minor axis dimension of first surface 21, b>0, and the unit is m. y1 satisfies the relationship: y1≥0.2b, and y1 can be 0.2b, b, 3b, and so on. This configuration allows first surface 21 to be constructed as a streamlined flow-guiding surface. When the fluid flows downstream, the fluid's flow trajectory continuously adapts to the geometry of first surface 21, allowing the fluid to maintain a stable attached flow state. The provision of first surface 21 can reduce local flow velocity differences during downstream flow, thereby reducing the energy dissipation rate and thus facilitating a reduction in the hydraulic loss coefficient.

[0043] In some embodiments of the present invention, Figure 3 As shown, the second surface 22 is constructed as a partial elliptical surface, the major axis of the second surface 22 is parallel to the axis of the flow member 2, and the ellipse equation of the second surface 22 is:

[0044] Specifically, the second surface 22 may be configured as a partial elliptical surface, and the major axis of the second surface 22 may be parallel to the axis of the flow member 2 , and the second surface 22 satisfies the elliptical curve equation: Among them, b is the minor axis size of the first surface 21, b>0, the unit is m, y2 satisfies the relationship: y2≥0.2b, y2 can be 0.2b, 0.5b, 0.8b, etc. When the fluid flows to the second surface 22 in the countercurrent direction, the second surface 22 can induce the fluid to form a vortex opposite to the mainstream direction, so that the spatial velocity distribution of the fluid is alienated to increase the migration distance of the fluid and enhance the internal friction of the fluid. Compared with the fluid flowing in the downstream direction, the fluid flowing in the countercurrent direction has a larger flow resistance, a larger energy dissipation rate, and a larger hydraulic loss coefficient, thereby making the hydraulic loss coefficients of the fluid in the downstream direction and the countercurrent direction different, so that the flow structure 10 can be suitable for application scenarios with different downstream flow resistance and countercurrent flow resistance.

[0045] In some embodiments of the present invention, Figure 3 As shown, the major axis of the first surface 21 is a, which satisfies the relationship: a=3b.

[0046] Among them, the major axis size of the first surface 21 can be a, with the unit of m, and a satisfies the relationship: a=3b, that is, the major axis size of the first surface 21 is three times the minor axis size. This reasonable structural setting can make the first surface 21 constructed into a shape that is more conducive to the fluid being in an attached flow state, so as to maintain a stable flow state, and can weaken the local flow velocity difference, thereby helping to reduce the hydraulic loss coefficient.

[0047] In some embodiments of the present invention, Figure 3 As shown, the major axis of the second surface 22 is c, and the minor axis is d, satisfying the relationship: c=0.8b, d=0.4b.

[0048] Among them, the major axis size of the second surface 22 can be c, and the minor axis size is d, both in units of m, and c and d satisfy the relationship: c = 0.8b, d = 0.4b, that is, the major axis size of the second surface 22 is twice the minor axis size. This reasonable structural setting allows the second surface 22 to induce part of the fluid to form a vortex opposite to the mainstream direction, thereby alienating the spatial velocity distribution of the countercurrent fluid, effectively reducing the flow rate of the countercurrent fluid, and thereby making the hydraulic loss coefficient of the fluid in the downstream direction and the countercurrent direction different, so that the flow-through structure 10 can be suitable for application scenarios with different downstream flow resistance and countercurrent flow resistance.

[0049] In some embodiments of the present invention, Figure 3 As shown, the generatrix of the second surface 22 is tangently continuous at the connection point between the end of the second surface 22 close to the third surface 23 and the end of the third surface 23 close to the second surface 22, and the position of the connection point satisfies the relationship: x3=0.6b, y3=0.8b.

[0050] The generatrix of the second surface 22 may be tangentially continuous with the third surface 23 at a connection point of the third surface 23 at one end of the second surface 22, such as Figure 3 In the plane rectangular coordinate system shown, the coordinates of the connection point are (x3, y3), and the position of the connection point on the plane rectangular coordinate system satisfies the relationship: x3=0.6b, y3=0.8b. This setting can make the sizes of the second surface 22 and the third surface 23 reasonable, and can make the second surface 22 and the third surface 23 smoothly connected. When the fluid flows from the upstream end 27 to the downstream end 26, near the connection between the second surface 22 and the third surface 23, the second surface 22 guides the first part of the fluid to flow in the direction A, and the third surface 23 guides the second part of the fluid to flow in the direction B. The first part of the fluid and the second part of the fluid impact each other to further increase the flow resistance, increase the energy dissipation rate, and increase the hydraulic loss coefficient.

[0051] In some embodiments of the present invention, Figure 3 As shown, the radius of the third surface 23 is e, which satisfies the relationship: e=3b.

[0052] Among them, the third surface 23 can be constructed as an arc surface, and the radius of the third surface 23 can be e, with the unit of m, and e satisfies the relationship: e=3b. This setting can make the size of the third surface 23 reasonable, so that the third surface 23 can induce part of the fluid to form a vortex opposite to the mainstream direction, so that the spatial velocity distribution of the countercurrent fluid is alienated, and the flow velocity of the countercurrent fluid is effectively reduced, thereby making the hydraulic loss coefficient of the fluid in the downstream direction and the countercurrent direction different, so that the flow-through structure 10 can be suitable for application scenarios with different downstream flow resistance and countercurrent flow resistance.

[0053] In some embodiments of the present invention, Figure 4 and Figure 5 As shown, the first surface 21 and the second surface 22 transition through the fourth surface 24, the width f of the fourth surface 24 satisfies the relationship: f = 0.01b, and / or, the flow-through member 2 further has a fifth surface 25, the fifth surface 25 is connected to the other end of the third surface 23, the fifth surface 25 is constructed as an arc surface and the width g satisfies the relationship: g = 0.05b.

[0054] Among them, the first surface 21 and the second surface 22 can be transitioned through the fourth surface 24, the fourth surface 24 can be constructed as an annular arc surface, and the width f of the fourth surface 24 along the radial direction of the flow channel body 1 satisfies the relationship: f = 0.01b, the unit is m, the fourth surface 24 can withstand the impact of the fluid, reduce the stress at the fourth surface 24, and reduce the risk of damage to the flow component 2 due to stress concentration, which is beneficial to improving the structural strength of the flow component 2 and extending the service life of the flow component 2.

[0055] The flow-through member 2 may have a fifth surface 25, which may be connected to the end of the third surface 23 away from the second surface 22. The fifth surface 25 may be constructed as an arc surface. The radial width g of the fifth surface 25 (the maximum radial width of the fifth surface 25) satisfies the relationship: g = 0.05b, in units of m. The fifth surface 25 may withstand the impact of the reverse-flowing fluid, reduce the stress at the fifth surface 25, and reduce the risk of damage to the flow-through member 2 due to stress concentration, which is beneficial to improving the structural strength of the flow-through member 2 and extending the service life of the flow-through member 2.

[0056] Table 1 below presents the CFD simulation results for the downstream head difference, downstream hydraulic loss coefficient, upstream head difference, and upstream loss coefficient at different fluid flow rates and different radial dimensions of the flow passage 2. The fluid flow rate u can be 5 m / s, 10 m / s, 15 m / s, and 20 m / s, respectively, and the radial dimension 2b of the flow passage 2 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8, respectively.

[0057]

[0058]

[0059]

[0060] In some embodiments of the present invention, Figure 3 As shown, the diameter of the flow channel body 1 is D, and the length of the flow member 2 along the radial direction is 2b. The hydraulic loss coefficient ζ1 in the downstream direction and the hydraulic loss coefficient ζ2 in the upstream direction of the flow structure 10 satisfy the relationship:

[0061] The diameter of the flow channel body 1 may be D, in m. The length of the flow passage 2 along the radial direction of the flow passage 2 may be 2b, in m. The hydraulic loss coefficient ζ of the flow passage structure 10 in the downstream direction and the hydraulic loss coefficient ζ in the upstream direction satisfy the relationship: This relationship can be obtained by fitting a curve equation to the calculation results of Table 1. This relationship can reflect the ratio of the hydraulic loss coefficient ζ1 in the downstream direction of the flow structure 10 to the hydraulic loss coefficient ζ2 in the upstream direction. It can be seen from the formula that the ratio of ζ / ζ is related to the size of the flow component 2 and the diameter of the flow channel body 1. Within the typical flow rate range, the ratio of ζ / ζ can be dynamically adjusted by adjusting the size of the flow component 2 and the diameter of the flow channel body 1. By applying the flow structure 10 of the present invention, the hydraulic loss coefficients of the fluid in the downstream direction and in the upstream direction can be effectively made different, so as to verify that the flow structure 10 of the embodiment of the present invention can be applied to application scenarios with different downstream flow resistance and upstream flow resistance. Moreover, by making the hydraulic loss coefficient ζ in the downstream direction of the flow structure 10 and the hydraulic loss coefficient ζ in the upstream direction satisfy the relationship: It can reduce the hydraulic loss coefficient in the downstream direction and increase the hydraulic loss coefficient in the upstream direction.

[0062] In some embodiments of the present invention, Figure 3 As shown, the length of the flow channel body 1 is D, the length of the flow channel 2 along the axis of the flow channel 2 is 2b, the fluid flow velocity in the flow channel body 1 is u, and the hydraulic loss coefficient of the flow channel structure 10 in the downstream direction is ζ1, which satisfies the relationship:

[0063] The diameter of the flow channel body 1 may be D, in m. The length of the flow passage 2 along the radial direction of the flow passage 2 may be 2b, in m. The hydraulic loss coefficient of the flow passage structure 10 in the downstream direction is ζ, which satisfies the relationship: This relationship can be obtained by fitting a curve equation to the calculation results in Table 1 to simulate the hydraulic loss coefficient flowing in the downstream direction, so as to analyze the difference between the hydraulic loss coefficients in the downstream direction and in the upstream direction. By setting the hydraulic loss coefficient in the downstream direction of the flow structure 10 to ζ1, the relationship is satisfied: It can reduce the hydraulic loss coefficient in the downstream direction.

[0064] In some embodiments of the present invention, Figure 3 As shown, the length of the flow channel body 1 is D, the length of the flow channel 2 along the axis of the flow channel 2 is 2b, the fluid flow velocity in the flow channel body 1 is u, and the hydraulic loss coefficient in the upstream direction of the flow channel structure 10 is ζ2, which satisfies the relationship:

[0065] The diameter of the flow channel body 1 may be D, in m. The length of the flow passage 2 along the radial direction of the flow passage 2 may be 2b, in m. The hydraulic loss coefficient of the flow passage structure 10 in the upstream direction is ζ2, which satisfies the relationship: This relationship can be obtained by fitting a curve equation to the calculation results in Table 1 to simulate the hydraulic loss coefficient flowing in the countercurrent direction, so as to analyze the difference between the hydraulic loss coefficients in the downstream direction and in the countercurrent direction. By setting the hydraulic loss coefficient in the countercurrent direction of the flow structure 10 to ζ2, the relationship is satisfied: It can improve the hydraulic loss coefficient in the upstream direction.

[0066] In some embodiments of the present invention, Figure 2 As shown, the flow-through structure 10 further includes: a connecting piece, which is connected between the inner wall of the flow channel body 1 and the flow-through piece 2 .

[0067] Among them, the inner wall of the flow channel main body 1 and the flow member 2 are separated, and the connecting member can be constructed as a wing plate, a rib, etc. The connecting member can be connected between the inner wall of the flow channel main body 1 and the flow member 2 to make the flow channel main body 1 and the flow member 2 relatively stationary, thereby replacing the design in the related art that achieves the effect of adjusting the forward and reverse flow resistance through movable parts, external control (including: check valves, guide holes, electronic control units, etc.), etc., to simplify the geometric configuration within the flow structure 10, so that there are no mechanical moving parts and no electronic control units in the flow structure 10, and the layout within the flow channel main body 1 can be simple, and the effect of adjusting the forward and reverse flow resistance can be achieved only through the shape of the flow member 2 and the relative position relationship between the flow member 2 and the flow channel main body 1.

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0070] In the description of the present invention, "plurality" means two or more.

[0071] In the description of the present invention, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features not being in direct contact with each other but being in contact with each other via another feature therebetween.

[0072] In the description of the present invention, “on”, “above” and “above” a first feature of a second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0073] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0074] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A flow-through structure (10) for adjusting forward and reverse flow resistance, characterized in that: include: A flow channel body (1) and a flow member (2), wherein the flow member (2) is arranged in the flow channel body (1) and is spaced apart from an inner wall of the flow channel body (1) to form a flow channel (3); Along the axial direction of the flow member (2), the flow member (2) has a downstream end (26) and an upstream end (27) opposite to each other; the flow member (2) has a first surface (21), a second surface (22), and a third surface (23); the first surface (21) is configured as an arc surface and is recessed in a direction away from the axial direction of the flow member (2); One end of the second surface (22) is connected to one end of the first surface (21) close to the upstream end (27), and the other end of the second surface (22) extends toward the downstream end (26). The second surface (22) is constructed as an arc surface and is located inside the first surface (21). The second surface (22) is concave in a direction away from the axis of the flow-through member (2). One end of the third surface (23) is connected to the other end of the second surface (22), and the other end of the third surface (23) extends toward the countercurrent end (27). The third surface (23) is constructed as an arc surface and is located inside the second surface (22). The third surface (23) is recessed toward the axial direction of the flow-through member (2).

2. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 1, characterized in that: The first surface (21) is constructed as a partial elliptical surface, and the major axis of the first surface (21) is coaxial with the axis of the flow-through member (2). The curve equation of the first surface (21) is: Wherein, b is the minor axis dimension of the first surface (21).

3. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 2, characterized in that: The second surface (22) is constructed as a partial elliptical surface, the major axis of the second surface (22) is parallel to the axis of the flow-through member (2), and the elliptical equation of the second surface (22) is:

4. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 2, characterized in that: The major axis of the first surface (21) is a, which satisfies the relationship: a=3b.

5. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 3, characterized in that: The major axis of the second surface (22) is c, and the minor axis is d, satisfying the relationship: c=0.8b, d=0.4b.

6. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 2, characterized in that: The generatrix of the second surface (22) is tangent-continuous at a connection point between an end of the second surface (22) close to the third surface (23) and an end of the third surface (23) close to the second surface (22), and the position of the connection point satisfies the relationship: x3=0.6b, y3=0.8b.

7. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 2, characterized in that: The radius of the third surface (23) is e, which satisfies the relationship e=3b.

8. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 2, characterized in that: The first surface (21) and the second surface (22) transition through a fourth surface (24), and a width f of the fourth surface (24) satisfies the relationship: f=0.01b; And / or, the flow-through member (2) further has a fifth surface (25), the fifth surface (25) is connected to the other end of the third surface (23), the fifth surface (25) is constructed as an arc surface and the width g satisfies the relationship: g=0.05b.

9. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 2, characterized in that: The length of the flow channel body (1) is D, and along the radial direction of the flow passage member (2), the length of the flow passage member (2) is 2b. The hydraulic loss coefficient ζ1 in the downstream direction and the hydraulic loss coefficient ζ2 in the upstream direction of the flow passage structure (10) satisfy the relationship:

10. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 2, characterized in that: The diameter of the flow channel body (1) is D, the length of the flow channel body (2) along the axial direction of the flow channel body (2) is 2b, the flow velocity of the fluid in the flow channel body (1) is u, and the hydraulic loss coefficient of the flow channel structure (10) in the downstream direction is ζ1, which satisfies the relationship:

11. The flow-through structure (10) for adjusting forward and reverse flow resistance according to claim 2, characterized in that: The length of the flow channel body (1) is D, the length of the flow channel body (2) along the axial direction of the flow channel body (2) is 2b, the flow velocity of the fluid in the flow channel body (1) is u, and the hydraulic loss coefficient in the countercurrent direction of the flow channel structure (10) is ζ2, which satisfies the relationship:

12. The flow-through structure (10) for adjusting forward and reverse flow resistance according to any one of claims 1 to 11, characterized in that: Also includes: A connecting piece is connected between the inner wall of the flow channel body (1) and the flow-through piece (2).

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