Blade flow guide type conical static water and fertilizer mixer

Abstract

The invention relates to a blade flow guide type cone-shaped static water and fertilizer mixer which comprises a cone. The cylinder is connected to the large-diameter end of the cone; the first blocky guide vane group is spirally and obliquely distributed in the cone; the two long-strip-shaped guide vane sets are arranged in the cylinder, a second block-shaped guide vane set is spirally and obliquely distributed between the two long-strip-shaped guide vane sets, and bent guide vane sets are arranged on the sides, away from each other, of the two long-strip-shaped guide vane sets respectively. Fluid is blocked, segmented and recombined through the first block-shaped guide vane set, the turbulent flow effect is enhanced, the flowing path of the fluid is prolonged, and vortexes are formed; the cylinder part ensures continuous formation of vortex and stable flowing of fluid, the fluid is uniformly distributed in the cylinder through three groups of guide vanes with different structures and functions, and the fluid is effectively guided to flow, so that a regular vortex structure is formed in the fertilizer mixer, and sufficient mixing of water and fertilizer is promoted.

Description

Technical Field

[0001] The present application relates to the technical field of water-fertilizer mixers, and in particular to a blade-guided conical-cylinder static water-fertilizer mixer. Background Art

[0002] Static water-fertilizer mixer is a high-efficiency mixing device without moving parts. It is mainly used in water-fertilizer integration technology. It mixes water and fertilizer in a certain proportion and then delivers them to the roots of plants. Static water-fertilizer mixer uses a mixing unit fixed in the tube to change the flow state of the fluid in the tube, so that water and fertilizer are constantly divided, displaced, and overlapped during the flow process, thereby achieving good dispersion and full mixing. In the laminar state, the fluid follows the law of "division-position movement-re-convergence"; in the turbulent state, in addition to the above three situations, the fluid will also produce violent vortices in the cross-sectional direction, and a strong shear force will act on the fluid, causing the fluid to further divide and mix.

[0003] The mixing unit of a traditional static water-fertilizer mixer is usually a spiral plate twisted at a certain angle (such as 180° or 270°), with adjacent spiral plates being left-handed and right-handed respectively, and cross-fixed in a pipe.

[0004] The traditional static water-fertilizer mixer with a spiral blade structure mainly relies on spiral flow to achieve water-fertilizer mixing. Since the movement state of the fluid is relatively single, it is easy to cause insufficient water-fertilizer mixing. Summary of the invention

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a blade-guided conical cylindrical static water-fertilizer mixer.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions: A blade-guided conical-cylinder static water-fertilizer mixer, comprising a fertilizer inlet and a fertilizer outlet, the blade-guided conical-cylinder static water-fertilizer mixer also includes: cone; A cylinder connected to the major diameter end of the cone; A first block guide blade group is spirally and obliquely distributed in the cone; Two long strip guide blade groups are mounted in the cylinder, a second block guide blade group is spirally and obliquely distributed between the two long strip guide blade groups, and a curved guide blade group is respectively provided on the side away from the two long strip guide blade groups.

[0007] Optionally, the first block-shaped guide blade group includes four first block-shaped guide blades, and one end of each of the first block-shaped guide blades is fixed to the inner wall of the cone.

[0008] Optionally, each long strip guide blade group includes two transverse long strip guide blades and two longitudinal long strip guide blades; Among them, one side of the two transverse long strip guide blades is fixed on the inner wall of the cylinder, and one side of the two longitudinal long strip guide blades is fixed on the inner wall of the cylinder.

[0009] Optionally, the transversely arranged long strip guide blades are staggered from the longitudinally arranged long strip guide blades and their axes are perpendicular to each other.

[0010] Optionally, the second block-shaped guide blade group includes four second block-shaped guide blades, and one end of each of the second block-shaped guide blades is fixed to the inner wall of the cylinder.

[0011] Optionally, the four second block-shaped guide blades are arranged at an axial inclination angle of 45°.

[0012] Optionally, each curved guide blade group includes four curved guide blade pairs, each of the curved guide blade pairs includes two curved guide blades, and one end of each of the curved guide blades is fixed to the inner wall of the cylinder.

[0013] Optionally, a bending angle of the curved guide vane is greater than 90° and less than 180°.

[0014] Optionally, the curved portion of the curved guide vane has a smooth transition.

[0015] The beneficial effects of the present application are as follows: compared with the static water-fertilizer mixer with a traditional spiral blade structure, the conical part of the static water-fertilizer mixer of the present application adopts an extended flow channel design to enhance the shear effect between fluid layers, slow down the flow rate of the fluid, and create more favorable conditions for the mixing process. At the same time, the built-in first block guide blade group blocks, divides and reorganizes the fluid, enhances the turbulence effect and extends the flow path of the fluid. When the water-fertilizer mixture continues to flow, it will produce a rotational motion and form a vortex, thereby improving the mixing efficiency and promoting the full blending of water and fertilizer; the cylindrical part provides a stable structural support, ensuring the continuous formation of vortices and the stable flow of the fluid. At the same time, through the built-in three groups of guide blades with different structures and functions, the uniform distribution of the fluid in the cylinder is achieved, and the fluid flow is effectively guided to form a regular vortex structure inside the fertilizer mixer, which promotes the full mixing of water and fertilizer.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0018] Figure 1 It is a structural schematic diagram of a blade-guided conical-cylinder static water-fertilizer mixer shown in an embodiment of the present application; Figure 2 is a schematic diagram of the interior of a conical part shown in an embodiment of the present application; Figure 3 is a first internal schematic diagram of a cylindrical portion shown in an embodiment of the present application; Figure 4 is a second internal schematic diagram of a cylindrical portion shown in an embodiment of the present application; Figure 5 is a third internal schematic diagram of the cylindrical portion shown in the embodiment of the present application; Figure 6 It is a simulation model diagram of a blade-guided conical-cylinder static water-fertilizer mixer shown in an embodiment of the present application; Figure 7 It is a cloud diagram of the volume fraction of nitrogen fertilizer inside the fertilizer mixer when water and a single fertilizer mother solution are mixed as shown in the embodiment of the present application; Figure 8 It is a cloud diagram of the volume fraction of nitrogen fertilizer at the outlet of the fertilizer mixer when water and a single fertilizer mother solution are mixed as shown in the embodiment of the present application; Fig. 9 It is a cloud diagram of the volume fractions of nitrogen fertilizer and phosphate fertilizer inside the fertilizer mixer when water is mixed with two fertilizer mother solutions as shown in the embodiment of the present application; Fig.10 It is a cloud diagram of the volume fractions of nitrogen fertilizer and phosphate fertilizer at the outlet of the fertilizer mixer when water is mixed with two fertilizer mother solutions as shown in the embodiment of the present application; Fig.11 It is a cloud diagram of the volume fractions of nitrogen, phosphorus and potassium fertilizers inside the fertilizer mixer when water is mixed with three kinds of fertilizer mother solutions as shown in the embodiment of the present application; Fig.12 It is a cloud diagram of the volume fractions of nitrogen, phosphorus and potassium fertilizers at the outlet of the fertilizer mixer when water is mixed with three kinds of fertilizer mother solutions as shown in the embodiment of the present application; Fig.13 The embodiment of the present application shows a fitting curve diagram of the inlet flow rate and outlet pressure drop of a blade-guided conical cylindrical static water-fertilizer mixer.

[0019] Figure numerals: 1, fertilizer inlet; 2, cone; 3, cylinder; 4, fertilizer outlet; 5, first block guide blade group; 6, long strip guide blade group; 7, second block guide blade group; 8, curved guide blade group; 9, nitrogen fertilizer mother solution inlet; 10, phosphate fertilizer mother solution inlet; 11, potash fertilizer mother solution inlet. DETAILED DESCRIPTION

[0020] In the description of the present application, 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 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 application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific situation.

[0023] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0025] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0026] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0027] In order to make the purpose, technical solutions and beneficial effects of the present application clearer, the preferred embodiments of the present application will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technical personnel.

[0028] Embodiment 1: See also Figures 1 to 5 A blade-guided conical-cylinder static water-fertilizer mixer comprises a fertilizer inlet 1 and a fertilizer outlet 4. The blade-guided conical-cylinder static water-fertilizer mixer also comprises: cone 2; A cylinder 3 connected to the large diameter end of the cone 2; A first block-shaped guide blade group 5 is spirally and obliquely distributed in the cone 2; Two long guide blade groups 6 are mounted in the cylinder 3, and a second block guide blade group 7 is distributed in a spiral shape between the two long guide blade groups 6. A curved guide blade group 8 is provided on the side away from each other of the two long guide blade groups 6.

[0029] Specifically, the diameter of the fertilizer inlet 1 is adapted to the minor diameter of the cone 2, the diameter of the cylinder 3 is adapted to the major diameter of the cone 2 and the diameter of the fertilizer outlet 4, the fertilizer inlet 1 is connected to the minor diameter end of the cone 2, the major diameter end of the cone 2 is connected to the cylinder 3, and the fertilizer outlet 4 is connected to the end of the cylinder 3 away from the cone 2, so that the fertilizer inlet 1, the cone 2, the cylinder 3 and the fertilizer outlet 4 are connected. The static fertilizer mixer of the present application is a conical cylindrical structure, and the fluid will produce a speed difference when contacting the inclined surfaces of the cone 2 and the cylinder 3, so that the shear effect between the fluid layers is enhanced, and then a vortex is generated to promote sufficient mixing between the fluids.

[0030] The first block guide blade group 5 is spirally distributed obliquely in the cone 2, and is used to block, divide and reorganize the fluid. Furthermore, the first block guide blade group 5 is placed on the flow path of the fluid and is arranged in a spiral oblique direction along the inner wall of the cone, which can prevent the fluid from flowing out quickly and increase the length of the fluid flow path; at the same time, according to the continuity equation, when the fluid flows from a narrow pipe into the relatively open cone 2 part, the fluid flow rate will decrease; by reducing the flow rate and increasing the path, each fluid has sufficient time to mix in the cone 2 part; in addition, when the fluid entering the cone 2 part bypasses the first block guide blade group 5 and flows downward, it will generate a rotational motion and form a vortex, thereby improving the mixing efficiency between the fluids.

[0031] Three groups of guide blades with different structures are arranged inside the cylinder 3: a long guide blade group 6, a second block guide blade group 7 and a curved guide blade group 8, and each group of guide blades has different functions. Among them, the blades of the long guide blade group 6 are arranged in a staggered manner perpendicular to the symmetry axis of the cylinder 3, which is used to better block the fluid liquid and prevent the fluid from flowing out quickly, thereby increasing the flow time of the fluid inside the cylinder and promoting full mixing between the fluids. Furthermore, the blades of the long guide blade group 6 are staggered in a staggered manner to form a complex blocking structure, which increases the contact area and contact length between the fluid and the blades. The fluid needs to flow around many blades, and the flow path becomes tortuous and long. The friction with the blade surface and the viscosity inside the fluid will increase significantly, thereby effectively blocking the flow of the fluid.

[0032] The second block guide blade group 7 is distributed obliquely in a spiral shape on the flow path of the fluid and is located between the two long strip guide blade groups 6, which is used to guide the flow of the fluid, extend the flow path and enhance the turbulence effect. Furthermore, the shape and angle of the guide blades distributed obliquely in a spiral shape will cause the fluid to be subjected to a force different from the original flow direction when it contacts the blades, thereby changing the flow direction. Since the spiral shape changes continuously, the fluid will gradually change direction along the spiral trajectory when passing through the blades, achieving a smoother turn and achieving the purpose of guiding the fluid to flow in a specific direction. A plurality of block guide blades distributed obliquely in a spiral shape will form a structure similar to a spiral channel as a whole. When the fluid flows in this channel, it will be constrained by the shape of the channel, resulting in a directional flow trend along the spiral direction, thereby being effectively guided. The blades distributed obliquely in a spiral shape can block the straight-line flow of the fluid, forcing the fluid to flow along the spiral path, effectively avoiding the short-circuit phenomenon, and further ensuring the extension of the flow path. When the fluid flows through the spirally obliquely distributed guide vanes, the shape and oblique angle of the blades will cause differences in the flow velocity and pressure of the fluid at different positions, thereby causing local disturbances of the fluid. The spiral distribution of multiple blades will cause the vortices to interact and superimpose, thus forming turbulence and enhancing the disturbance effect.

[0033] The two curved guide blade groups 8 are respectively distributed on the side away from each other of the two long guide blade groups 6, that is, one is distributed on the top edge of the inner wall of the cylinder 3, and the other is distributed on the bottom edge of the inner wall of the cylinder 3, which are used to guide the fluid at the cylinder wall to flow into the cylinder along a specified path to achieve uniform mixing, while reducing the stress on the blade structure and preventing internal blades from breaking. Furthermore, the curved guide blades can change the direction of the fluid flowing against the wall and flow to different positions in the cylinder, so that the fluid originally flowing along the cylinder wall is mixed with the fluid in the central area or other positions in the cylinder, thereby promoting the mixing of the fluid in the entire cylinder space; in the curved part of the blade, due to the change in the curvature of the flow channel, the fluid will produce local velocity changes and pressure fluctuations, thereby inducing fluid disturbance and enhancing the mixing between fluid micro-groups; the curved guide blade group can guide the fluid to form a circulation, and the circulation can drive the surrounding fluid to move together, so that the fluid at the cylinder wall and the fluid in other areas of the cylinder are constantly exchanged and mixed, thereby improving the uniformity of mixing; the curved blades can make the fluid change the flow direction in a smoother manner. When the fluid passes through the curved blades, it gradually adapts to the change in flow direction rather than suddenly turning, thereby reducing the impact load on the blades and preventing internal blades from breaking.

[0034] To sum up, compared with the static water-fertilizer mixer with a traditional spiral blade structure, the cone 2 part of the static water-fertilizer mixer of the present application adopts an extended flow channel design to enhance the shear effect between fluid layers, slow down the flow rate of the fluid, and create more favorable conditions for the mixing process. At the same time, the built-in first block guide blade group 5 blocks, divides and reorganizes the fluid, enhances the turbulence effect and extends the flow path of the fluid. When the water-fertilizer mixture continues to flow, it will produce a rotational motion and form a vortex, thereby improving the mixing efficiency and promoting the full blending of water and fertilizer; the cylinder 3 part provides a stable structural support, ensuring the continuous formation of vortices and the stable flow of the fluid. At the same time, through the built-in three groups of guide blades with different structures and functions, the fluid is evenly distributed in the cylinder 3, which effectively guides the fluid flow, so that it forms a regular vortex structure inside the fertilizer mixer, and promotes the full mixing of water and fertilizer.

[0035] Embodiment 2: See also Figures 2 to 5 Based on the first embodiment, optionally, the first block guide blade group 5 includes four first block guide blades, and one end of each of the first block guide blades is fixed on the inner wall of the cone 2.

[0036] Specifically, the four first block-shaped guide blades are distributed obliquely in a spiral shape, and the four blades can be reasonably arranged in a limited space, which can fully play the role of blocking, dividing and reorganizing the fluid, and will not cause space congestion due to too many blades, affect the fluid flow or interfere with other components.

[0037] Optionally, each long strip guide blade group 6 includes two transverse long strip guide blades and two longitudinal long strip guide blades; One side of the two transverse long guide blades is fixed on the inner wall of the cylinder 3, and one side of the two longitudinal long guide blades is fixed on the inner wall of the cylinder 3. The transversely arranged long guide blades are staggered from the longitudinally arranged long guide blades, and the axes of the two are perpendicular to each other.

[0038] Specifically, when the fluid encounters the long strip guide blade set 6, the original flow direction will be forced to change. The 90° horizontal and vertical staggered layout causes these vortices to interfere with and overlap each other, further aggravating the degree of turbulence of the fluid. The energy of the fluid in the turbulent state dissipates quickly, and the kinetic energy of the flow is consumed in large quantities, making it difficult to maintain the original flow speed and direction, thereby achieving effective blocking of the fluid.

[0039] Optionally, the second block-shaped guide blade set 7 includes four second block-shaped guide blades, and one end of each of the second block-shaped guide blades is fixed to the inner wall of the cylinder 3 .

[0040] Specifically, the four second block-shaped guide blades are distributed obliquely in a spiral shape, and the four blades can be reasonably arranged in a limited space, which can fully play the blocking role without causing space congestion due to too many blades, affecting fluid flow or interfering with other components.

[0041] Optionally, the four second block-shaped guide blades are arranged at an axial inclination angle of 45°.

[0042] Specifically, the 45° axial inclination angle can achieve a more balanced flow guidance between the axial and radial directions of the fluid. When the fluid passes through the blades, it will not only obtain a certain axial propulsion force, but also have appropriate diffusion or contraction in the radial direction, so that the fluid can better fill and utilize the space in the space, avoid the situation where the local flow velocity is too high or too low, and help to improve the uniformity and stability of the entire flow field; the blades arranged at a 45° inclination can make the fluids of different flow layers or different sources intersect and collide with each other at a specific angle and path after passing through the blades, increase the interaction between the fluids, and thus enhance the mixing effect.

[0043] Optionally, each curved guide blade group 8 includes four curved guide blade pairs, each of the curved guide blade pairs includes two curved guide blades, and one end of each of the curved guide blades is fixed to the inner wall of the cylinder 3 .

[0044] Specifically, the two curved guide blade groups 8 have a total of sixteen curved guide blades, wherein two curved guide blades form a pair, four curved guide blade pairs are distributed on the top edge of the inner wall of the cylinder, and four curved guide blade pairs are distributed on the bottom edge of the inner wall of the cylinder.

[0045] Optionally, a bending angle of the curved guide vane is greater than 90° and less than 180°.

[0046] Specifically, the obtuse angle bend can make the turning process of the fluid smoother when passing through the guide vane. Compared with sharp angle or right angle bend, the obtuse angle bend gives the fluid more buffer space and time, allowing the fluid to gradually change direction, reducing the energy loss and pressure mutation caused by sharp turning, helping to maintain the stable flow of the fluid and improve the overall efficiency of the system; when the fluid impacts the guide vane, the obtuse angle bend can disperse the force of the fluid to a larger blade area. Compared with the sharp angle bend, the obtuse angle bend makes the direction of the force more dispersed, reduces the excessive pressure on the local area of ​​the blade, and reduces the risk of deformation and damage of the blade due to concentrated force, which helps to improve the structural strength and stability of the blade and extend its service life; the obtuse angle bend can make the stress distribution more uniform and improve the reliability of the blade structure. In this embodiment, the bending angle of the curved guide vane is 135°.

[0047] Optionally, the curved portion of the curved guide vane has a smooth transition.

[0048] Specifically, smoothly transitioned bends allow fluid to pass more smoothly, reducing energy loss and pressure drop during the flow process; when the fluid flows in smoothly transitioned bends, it will not produce strong impact and vibration due to sudden changes in direction, thereby reducing the noise and vibration caused by unstable fluid flow and reducing fatigue damage to the blade structure; in addition, smooth bends are not prone to fluid retention and local corrosion environments, which helps to maintain the integrity of the blade surface and enhance its corrosion resistance.

[0049] Embodiment three: See also Figures 6 to 13 Based on the above embodiment, the present application uses Fluent software to perform performance simulation analysis on the designed blade-guided conical cylindrical static water-fertilizer mixer. The performance evaluation index is the fertilizer liquid volume fraction inside the mixer and the mixing uniformity at the outlet of the mixer (mixing uniformity = {1-[(maximum volume fraction-minimum volume fraction) / maximum volume fraction]}×100%). The specific analysis steps are as follows: S1: Construct a simulation structure model of a blade-guided conical cylindrical static water-fertilizer mixer; Add three mother liquid inlets at the front end of the blade-guided conical-cylinder static water-fertilizer mixer to complete the construction of the simulation structure model of the blade-guided conical-cylinder static water-fertilizer mixer ( Figure 6 );Depend on Figure 6 It can be seen that the model has 3 fertilizer mother solution inlets (from left to right, nitrogen fertilizer mother solution inlet, phosphate fertilizer mother solution inlet, potassium fertilizer mother solution inlet), 1 water inlet and 1 water-fertilizer mixed solution outlet.

[0050] S2: Design model simulation analysis strategy; The simulation structure model of the blade-guided conical-cylinder static water-fertilizer mixer has three fertilizer mother liquor inlets and one water inlet, so there are three groups of seven water-fertilizer mixing methods, namely, water mixed with a single fertilizer mother liquor (water + nitrogen, water + phosphorus, water + potassium), water mixed with two fertilizer mother liquors (water + nitrogen + phosphorus, water + nitrogen + potassium, water + phosphorus + potassium), and water mixed with three fertilizer mother liquors (water + nitrogen + phosphorus + potassium). When simulating and analyzing the blade-guided conical-cylinder static water-fertilizer mixer, the inlets for transporting nitrogen, phosphorus and potassium fertilizer mother liquors are regarded as equivalent channels, respectively, so there is no need to consider the unique properties of each inlet separately, which reduces the calculation burden of the model and also allows the research to focus on evaluating the mixing performance of the blade-guided conical-cylinder static water-fertilizer mixer under different water-fertilizer combinations. Based on the above simplification strategy, three representative combinations (water + nitrogen, water + nitrogen + phosphorus, water + nitrogen + phosphorus + potassium) were selected from the three groups of water-fertilizer mixing methods for subsequent simulation analysis.

[0051] S3: Analysis of simulation results of mixing effect of blade-guided conical-cylinder static water-fertilizer mixer; (1) Mixing of water and single fertilizer solution; Taking the mixing of water and nitrogen fertilizer mother liquor as an example, the Fluent simulation analysis software is used to simulate the transportation of water and nitrogen fertilizer mother liquor (the channels of phosphate fertilizer and potassium fertilizer mother liquor are both closed) from the water inlet and the nitrogen fertilizer mother liquor inlet to the blade-guided conical cylindrical static water-fertilizer mixer for mixing; multiple radial sections are taken at appropriate positions for the simulation structure model of the blade-guided conical cylindrical static water-fertilizer mixer to obtain the nitrogen fertilizer volume fraction cloud map inside the mixer ( Figure 7 ) and the volume fraction of nitrogen fertilizer at the mixer outlet ( Figure 8 );Depend on Figure 7 It can be seen that after the water and nitrogen fertilizer mother solution enter the blade-guided conical-cylinder static water-fertilizer mixer, there is no obvious concentration gradient inside it, which shows that the conical-cylinder structure of the blade-guided conical-cylinder static water-fertilizer mixer and the guide blades with different structures and functions inside it can make all the inlet liquids quickly and evenly distributed inside the fertilizer mixer, thereby avoiding the formation of low-concentration and high-concentration domains and achieving the goal of efficient dilution and uniform distribution; Figure 8 It can be seen that the mixing uniformity of nitrogen fertilizer is 84.8%.

[0052] (2) Mixing water and two fertilizer solutions; Taking the mixing of water, nitrogen fertilizer mother liquor and phosphate fertilizer mother liquor as an example, the Fluent simulation analysis software was used to simulate the transportation of water, nitrogen fertilizer mother liquor and phosphate fertilizer mother liquor (potassium fertilizer mother liquor channel was closed) from the water inlet, nitrogen fertilizer mother liquor inlet and phosphate fertilizer mother liquor inlet to the blade-guided conical cylindrical static water-fertilizer mixer for mixing; multiple radial sections were taken at appropriate positions for the simulation structure model of the blade-guided conical cylindrical static water-fertilizer mixer to obtain the volume fraction cloud map of nitrogen fertilizer and phosphate fertilizer inside the mixer ( Fig. 9 ) and the volume fraction cloud diagram of nitrogen fertilizer and phosphate fertilizer at the mixer outlet ( Fig.10 );Depend on Fig. 9 It can be seen that the nitrogen fertilizer mother solution and the phosphate fertilizer mother solution can be quickly mixed with water and diluted inside the fertilizer mixer. There is no obvious low-concentration and high-concentration area inside the fertilizer mixer. The mixing effect is good and is not affected by the increase in the amount of liquid phase. Fig.10 It can be seen that the mixing uniformity of nitrogen fertilizer and phosphorus fertilizer is 94.5% and 95.4%, respectively.

[0053] (3) Mixing water and three fertilizer solutions; Taking the mixing of water and nitrogen fertilizer mother liquor, phosphate fertilizer mother liquor and potash fertilizer mother liquor as an example, the Fluent simulation analysis software was used to simulate the transportation of water, nitrogen fertilizer mother liquor, phosphate fertilizer mother liquor and potash fertilizer mother liquor from the water inlet, nitrogen fertilizer mother liquor inlet, phosphate fertilizer mother liquor inlet and potash fertilizer mother liquor inlet to the blade-guided conical cylindrical static water-fertilizer mixer for mixing; multiple radial sections were taken at appropriate positions for the simulation structure model of the blade-guided conical cylindrical static water-fertilizer mixer to obtain the volume fraction cloud map of nitrogen fertilizer, phosphate fertilizer and potash fertilizer inside the mixer ( Fig.11 ) and the volume fraction cloud diagram of nitrogen fertilizer, phosphate fertilizer and potash fertilizer at the mixer outlet ( Fig.12 );Depend on Fig.11 It can be seen that the mother liquors of nitrogen fertilizer, phosphate fertilizer and potash fertilizer can be quickly mixed and diluted with water inside the fertilizer mixer. There are no obvious low-concentration and high-concentration areas inside the fertilizer mixer. The mixing effect is good and is not affected by the increase in the amount of liquid phase. Fig.12 It can be seen that the mixing uniformity of nitrogen fertilizer, phosphate fertilizer and potassium fertilizer is 92.7%, 95.9% and 91.9% respectively.

[0054] In summary, the conical structure of the blade-guided conical-cylindrical static water-fertilizer mixer and the guide blades with different structures and functions inside it can achieve sufficient mixing between water and the mother liquors of various fertilizers. During the mixing process, no obvious low-concentration and high-concentration areas appear inside the fertilizer mixer, and the mixing effect is not affected by the increase in the amount of liquid phase, indicating that the structural design of the blade-guided conical-cylindrical static water-fertilizer mixer is reasonable; in addition, the mixing effect of the blade-guided conical-cylindrical static water-fertilizer mixer for each fertilizer in the above three typical combinations meets the national industry standard (DG / T 274-2022), that is, the mixing uniformity requirement of ≥80%, indicating that the blade-guided conical-cylindrical static water-fertilizer mixer can achieve uniform mixing of water and fertilizer in practical applications, and has high promotion and application value.

[0055] S4: Flow resistance simulation analysis of blade-guided conical cylindrical static water-fertilizer mixer; The resistance (i.e., flow resistance) encountered by the fluid when flowing in the blade-guided conical-cylinder static water-fertilizer mixer is an important factor affecting the mixing efficiency and mixing effect between fluids. The total resistance encountered by the fluid when passing through the blade-guided conical-cylinder static water-fertilizer mixer can be determined by determining the inertial resistance coefficient C2 (the resistance caused by the change in fluid velocity) and the viscous resistance coefficient D (the resistance caused by the viscosity inside the fluid). The three fertilizer mother liquid inlets in the blade-guided conical-cylinder static water-fertilizer mixer simulation structure model constructed in step S1 are removed, and only the complete blade-guided conical-cylinder static water-fertilizer mixer structure model is retained. The flow rate of the fluid at the inlet is dynamically adjusted in the Fluent software to obtain the corresponding outlet pressure drop (intuitively reflecting the resistance encountered by the fluid when passing through the blade-guided conical-cylinder static water-fertilizer mixer) as shown in Table 1, and a fitting curve of the inlet flow rate and the outlet pressure drop is drawn ( Fig.13 ).

[0056] Table 1 Correspondence between inlet flow rate and outlet pressure drop Depend on Fig.13 It can be obtained that the outlet pressure drop and the inlet flow rate satisfy a quadratic function relationship (Formula 1), which is consistent with the theory of fluid flow properties (laminar and turbulent flow); for laminar flow, the outlet pressure drop and the inlet flow rate satisfy a linear proportional relationship, and for turbulent flow, the outlet pressure drop is proportional to the square of the inlet flow rate, while the actual outlet pressure drop and the inlet flow rate do not completely conform to the linear and square relationship, which indicates that the fluid may show a transition from laminar flow to turbulent flow when flowing in the blade-guided conical cylindrical static water-fertilizer mixer, or there are two flow states in different regions, and turbulence is more conducive to the full mixing of fluids, which verifies the performance of the blade-guided conical cylindrical static water-fertilizer mixer from another level.

[0057] (Formula 1) Where: Y is the outlet pressure drop; X is the inlet flow rate.

[0058] In addition to the fluid flow properties, the outlet pressure drop and the inlet flow rate are also affected by many factors such as fluid density (ρ), fluid viscosity (μ) and the length (L) of the blade-guided conical static water-fertilizer mixer; According to Formula 2 and Formula 3, the inertial resistance coefficient C2 is 3.862, and the viscous resistance coefficient D is 74036.510; the viscous resistance coefficient is much larger than the inertial resistance coefficient, which shows that in promoting uniform mixing between fluids, it mainly depends on the internal viscosity of the fluid, and the flow rate of the fluid has little effect on the mixing uniformity.

[0059] (Formula 2) (Formula 3) Where: is the fluid density, which is taken as 1×103 kg / m3; is the fluid viscosity, which is 1.01×10-3 Pa·s; is the mixer cone height, which is 0.16 m.

[0060] In addition, the cone diameter of the present application is 95mm and the overall height is 280mm, of which the height of the cone 2 part is 60mm, the height of the cylinder 3 part is 100mm, and the lengths of the fertilizer inlet pipe and the fertilizer outlet pipe are both 60mm; the inner diameters of the fertilizer inlet 1 and the fertilizer outlet 4 are both 32mm, which can be directly embedded in a DN25 caliber (outer diameter of 32mm) pipe. Water and each mother liquor can be fully mixed by flowing into the blade-guided cone-shaped static water-fertilizer mixer through their own power, and the mixing efficiency and fertilizer liquid uniformity are higher. During the field fertilization process, there will be no local over- or under-fertilization phenomenon, which is beneficial to the normal growth of crops and reduces environmental pollution.

[0061] It should be noted that structures and / or installation methods not described in detail in this application are known to those skilled in the art in combination with common knowledge and / or prior art, and are not the focus of disclosure in this application and will not be further elaborated herein.

[0062] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A blade-guided conical-cylinder static water-fertilizer mixer, comprising a fertilizer inlet (1) and a fertilizer outlet (4), characterized in that: The blade-guided conical-cylinder static water-fertilizer mixer also includes: cone (2); A cylinder (3) connected to the large diameter end of the cone (2); A first block-shaped guide blade group (5) is distributed in a spiral shape and obliquely inside the cone (2); Two long strip guide blade groups (6) are mounted in the cylinder (3), a second block guide blade group (7) is distributed in a spiral shape and obliquely between the two long strip guide blade groups (6), and a curved guide blade group (8) is respectively provided on the sides of the two long strip guide blade groups (6) that are away from each other.

2. The blade-guided conical-cylinder static water-fertilizer mixer according to claim 1, characterized in that: The first block-shaped guide blade group (5) comprises four first block-shaped guide blades, and one end of each of the first block-shaped guide blades is fixed on the inner wall of the cone (2).

3. The blade-guided conical-cylinder static water-fertilizer mixer according to claim 1, characterized in that: Each long strip guide blade group (6) comprises two transverse long strip guide blades and two longitudinal long strip guide blades; One side of the two transverse long strip guide blades is fixed to the inner wall of the cylinder (3), and one side of the two longitudinal long strip guide blades is fixed to the inner wall of the cylinder (3).

4. The blade-guided conical-cylinder static water-fertilizer mixer according to claim 3, characterized in that: The transversely arranged long strip guide blades are staggered from the longitudinally arranged long strip guide blades, and the axes of the two are perpendicular to each other.

5. The blade-guided conical-cylinder static water-fertilizer mixer according to claim 1, characterized in that: The second block-shaped guide blade group (7) comprises four second block-shaped guide blades, and one end of each of the second block-shaped guide blades is fixed to the inner wall of the cylinder (3).

6. The blade-guided conical-cylinder static water-fertilizer mixer according to claim 1, characterized in that: The four second block-shaped guide blades are arranged at an axial inclination angle of 45°.

7. The blade-guided conical-cylinder static water-fertilizer mixer according to claim 1, characterized in that: Each curved guide blade group (8) comprises four curved guide blade pairs, each curved guide blade pair comprises two curved guide blades, and one end of each curved guide blade is fixed to the inner wall of the cylinder (3).

8. The blade-guided conical-cylinder static water-fertilizer mixer according to claim 7, characterized in that: The bending angle of the curved guide vane is greater than 90° and less than 180°.

9. The blade-guided conical-cylinder static water-fertilizer mixer according to claim 8, characterized in that: The curved portion of the curved guide blade has a smooth transition.

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