Blade-guided conical static water and fertilizer mixing device

Abstract

The application relates to a blade-guiding conical-cylinder type static water-fertilizer mixer, which comprises a cone, a cylinder connected to one end of the cone, a first block-shaped guiding blade group spirally and obliquely arranged in the cone, two long-strip-shaped guiding blade groups arranged in the cylinder, a second block-shaped guiding blade group spirally and obliquely arranged between the two long-strip-shaped guiding blade groups, and a curved guiding blade group arranged on the side of each long-strip-shaped guiding blade group away from the other long-strip-shaped guiding blade group. The first block-shaped guiding blade group blocks, divides and recombines the fluid, enhances the turbulence effect, prolongs the flow path of the fluid, and forms a vortex. The cylinder part ensures the continuous formation of the vortex flow and the stable flow of the fluid. The three groups of guiding blades with different structures and functions realize the uniform distribution of the fluid in the cylinder, effectively guide the flow of the fluid, make the fluid form a regular vortex structure in the fertilizer mixer, and promote the full mixing of the water and the fertilizer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water and fertilizer mixers, in particular to a blade flow guide type conical cylinder static water and fertilizer mixer. BACKGROUND

[0002] The static water and fertilizer mixer is a high-efficiency mixing device without moving parts, mainly used in water and fertilizer integration technology to uniformly mix water and fertilizer according to a certain proportion and then deliver them to the plant roots. The static water and fertilizer mixer changes the flow state of fluid in the pipe by using a mixing unit body fixed in the pipe, so that the water and fertilizer are continuously divided, displaced and overlapped in the flow process, thereby achieving good dispersion and full mixing. In the laminar flow state, the fluid follows the law of "division-position movement-recombination"; and in the turbulent flow state, in addition to the above three cases, the fluid will also produce strong vortex in the cross-sectional direction, and the fluid will be further divided and mixed by the strong shearing force acting on the fluid.

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

[0004] The static water and fertilizer mixer with the traditional spiral blade structure mainly relies on spiral flow to realize water and fertilizer mixing, and since the motion state of the fluid is relatively single, the water and fertilizer mixing is prone to be insufficient. SUMMARY

[0005] To solve or partially solve the problems in the related art, the present application provides a blade flow guide type conical cylinder static water and fertilizer mixer.

[0006] To achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0007] A blade flow guide type conical cylinder static water and fertilizer mixer, comprising a fertilizer inlet and a fertilizer outlet, the blade flow guide type conical cylinder static water and fertilizer mixer further comprising:

[0008] a cone;

[0009] a cylinder connected to one end of the large diameter of the cone;

[0010] a first block-shaped flow guide blade group spirally and obliquely distributed in the cone;

[0011] two long strip-shaped flow guide blade groups erected in the cylinder, a second block-shaped flow guide blade group spirally and obliquely distributed between the two long strip-shaped flow guide blade groups, and a curved flow guide blade group arranged on the side away from each other of the two long strip-shaped flow guide blade groups.

[0012] Optionally, the first block-shaped flow guide vane group comprises four first block-shaped flow guide vanes, one end of each of the first block-shaped flow guide vanes being fixed to the inner wall of the cone.

[0013] Optionally, each of the strip-shaped flow guide vane groups comprises two transverse strip-shaped flow guide vanes and two longitudinal strip-shaped flow guide vanes.

[0014] Optionally, one side of the two transverse strip-shaped flow guide vanes is fixed to the inner wall of the cylinder, and one side of the two longitudinal strip-shaped flow guide vanes is fixed to the inner wall of the cylinder.

[0015] Optionally, the transverse strip-shaped flow guide vanes are staggered with the longitudinal strip-shaped flow guide vanes, and the axes of the transverse strip-shaped flow guide vanes and the longitudinal strip-shaped flow guide vanes are perpendicular to each other.

[0016] Optionally, the second block-shaped flow guide vane group comprises four second block-shaped flow guide vanes, one end of each of the second block-shaped flow guide vanes being fixed to the inner wall of the cylinder.

[0017] Optionally, the four second block-shaped flow guide vanes are arranged at an axial inclination angle of 45°.

[0018] Optionally, each of the curved flow guide vane groups comprises four curved flow guide vane pairs, each of the curved flow guide vane pairs comprising two curved flow guide vanes, one end of each of the curved flow guide vanes being fixed to the inner wall of the cylinder.

[0019] Optionally, the curved flow guide vanes have a bending angle greater than 90° and less than 180°.

[0020] Optionally, the curved flow guide vanes have a smooth transition at the bending part.

[0021] The static water and fertilizer mixer of the present application has the following beneficial effects: compared with the conventional static water and fertilizer mixer with a spiral vane structure, the cone part of the static water and fertilizer mixer of the present application adopts an expansion design of a flow channel to enhance the shearing effect between fluid layers, slow down the flow rate of the fluid, and create more favorable conditions for the mixing process. Meanwhile, the first block-shaped flow guide vane group built-in the cone part blocks, divides, and recombines the fluid, enhances the turbulence effect, and prolongs the flow path of the fluid. When the water and fertilizer mixture continues to flow, it will produce a rotating motion and form a vortex, thereby improving the mixing efficiency and promoting the sufficient intermingling of water and fertilizer. The cylinder part provides stable structural support to ensure the continuous formation of the vortex flow and the stable flow of the fluid. Meanwhile, the three groups of flow guide vanes with different structures and functions built-in the cylinder part realize the uniform distribution of the fluid in the cylinder, effectively guide the flow of the fluid, make the fluid form a regular vortex structure in the fertilizer mixer, and promote the sufficient mixing of water and fertilizer.

[0022] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 Schematic diagram of the structure of a blade-guided conical-cylinder static water-fertilizer mixer shown in an embodiment of the present application;

[0025] Figure 2 is a schematic diagram of the interior of a conical portion shown in an embodiment of the present application;

[0026] Figure 3 is a first internal schematic diagram of a cylindrical portion shown in an embodiment of the present application;

[0027] Figure 4 is a second internal schematic diagram of the cylindrical portion shown in an embodiment of the present application;

[0028] Figure 5 is a third internal schematic diagram of the cylindrical portion shown in the embodiment of the present application;

[0029] Figure 6 This is a simulation model diagram of a blade-guided conical-cylinder static water-fertilizer mixer shown in an embodiment of the present application;

[0030] Figure 7 This 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;

[0031] Figure 8 This is a cloud diagram of the volume fraction of nitrogen fertilizer at the outlet of the fertilizer mixer when water is mixed with a single fertilizer mother solution as shown in the embodiment of the present application;

[0032] Figure 9 This is a cloud diagram of the volume fractions of nitrogen fertilizer and phosphate fertilizer inside a fertilizer mixer when water is mixed with two fertilizer mother solutions as shown in an embodiment of the present application;

[0033] Figure 10 This 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;

[0034] Figure 11 This is a cloud diagram of the volume fractions of nitrogen, phosphorus, and potassium fertilizers inside a fertilizer mixer when water is mixed with three fertilizer mother solutions as shown in the embodiment of the present application;

[0035] Figure 12 This 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 fertilizer mother solutions as shown in the embodiment of the present application;

[0036] Figure 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.

[0037] 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

[0038] 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 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 a limitation on the present application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0040] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0041] In the present application, unless specifically stated and limited otherwise, a first feature is "on" or "under" a second feature if the first and second features are in direct contact, or the first and second features are in indirect contact with an intermediate medium. Moreover, the first feature is "over", "above" and "on top of" the second feature if the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher in horizontal level than the second feature. The first feature is "under", "below" and "underneath" the second feature if the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower in horizontal level than the second feature.

[0042] In the present application, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present application. The illustrative representations of the above terms in the specification are not necessarily directed to the same embodiment or example, and the specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, different embodiments or examples described in the specification can be combined and combined with features of different embodiments or examples, if not mutually exclusive.

[0043] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary, and should not be construed as limiting the present application, and those of ordinary skill in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

[0044] The above is only an optional embodiment of the present application, and does not limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

[0045] In order to make the purpose, technical scheme and beneficial effects of the present application more clear, the preferred embodiments of the present application will be described in detail below with reference to the drawings, so as to facilitate the understanding of the skilled in the art.

[0046] Embodiment one:

[0047] Referring to Figures 1 to 5 A blade-guided conical cylindrical static water and fertilizer mixer, comprising a fertilizer inlet 1 and a fertilizer outlet 4, the blade-guided conical cylindrical static water and fertilizer mixer further comprising:

[0048] a cone 2;

[0049] a cylinder 3 connected to one end of the large diameter of the cone 2;

[0050] The first block-shaped flow guide vane group 5 is spirally and obliquely distributed in the cone 2.

[0051] The two long strip-shaped flow guide vane groups 6 are arranged in the cylinder 3, and the second block-shaped flow guide vane group 7 is spirally and obliquely distributed between the two long strip-shaped flow guide vane groups 6. The two long strip-shaped flow guide vane groups 6 are respectively provided with the curved flow guide vane group 8 on the side away from each other.

[0052] Specifically, the diameter of the fertilizer inlet 1 is matched with the small diameter of the cone 2, the diameter of the cylinder 3 is matched with the large diameter of the cone 2 and the diameter of the fertilizer outlet 4, the fertilizer inlet 1 is connected with the small diameter end of the cone 2, the large diameter end of the cone 2 is connected with the cylinder 3, and the fertilizer outlet 4 is connected with the end of the cylinder 3 away from the cone 2. In this way, the fertilizer inlet 1, the cone 2, the cylinder 3 and the fertilizer outlet 4 are communicated. The static fertilizer mixer of the application is a conical cylinder structure. When the fluid contacts the inclined surface of the cone 2 and the cylinder 3, a speed difference is generated, the shear effect between the fluid layers is enhanced, and eddy current is generated to promote the mixing of the fluids.

[0053] The first block-shaped flow guide vane group 5 is spirally and obliquely distributed in the cone 2, and is used for blocking, dividing and recombining the fluid. Further, the first block-shaped flow guide vane group 5 is arranged on the flow path of the fluid and is spirally and obliquely arranged along the inner wall of the cone, so that the fluid can be prevented from flowing out quickly and the length of the flow path of the fluid is increased. According to the continuity equation, when the fluid flows from a narrow pipe into a relatively open cone 2 part, the flow rate of the fluid will decrease. By reducing the flow rate and increasing the path, the fluids have sufficient time to mix in the cone 2 part. In addition, when the fluid entering the cone 2 part flows downward around the first block-shaped flow guide vane group 5, the fluid will produce a rotating motion and form a vortex, thereby improving the mixing efficiency between the fluids.

[0054] The cylinder 3 is provided with three groups of flow guide vanes with different structures inside: the long strip-shaped flow guide vane group 6, the second block-shaped flow guide vane group 7 and the curved flow guide vane group 8, and each group of flow guide vanes has different functions. The blades of the long strip-shaped flow guide vane group 6 are arranged in a crisscross manner perpendicular to the symmetry axis direction of the cylinder 3, which is used to better block the fluid, so as to prevent the fluid from flowing out quickly, thereby increasing the flow time of the fluid in the cylinder and promoting the sufficient intermingling of the fluids. Further, the blades of the long strip-shaped flow guide vane group 6 are crisscrossed 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 a large number of blades, and the flow path becomes tortuous and long. The friction with the surface of the blades and the viscous force inside the fluid are significantly increased, thereby effectively blocking the flow of the fluid.

[0055] The second block-shaped flow guide vane group 7 is helically and obliquely distributed on the fluid flow path and located between the two long strip-shaped flow guide vane groups 6, for guiding fluid flow, lengthening the flow path and enhancing the turbulence effect. Further, the helically and obliquely distributed flow guide vane changes the shape and angle of the fluid when it contacts the vane, so that the fluid is subjected to a force different from the original flow direction, thereby changing the flow direction. Since the helical shape is continuously changing, the fluid gradually changes direction along the helical trajectory when passing through the vane, achieving a relatively smooth turning and achieving the purpose of guiding the fluid to flow in a specific direction. The plurality of helically and obliquely distributed block-shaped flow guide vanes forms 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, producing a directional flow tendency along the spiral direction, thereby being effectively guided. The helically and obliquely distributed vane 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 lengthening of the flow path. When the fluid flows through the helically and obliquely distributed flow guide vane, due to the shape and oblique angle of the vane, the flow velocity and pressure at different positions of the fluid will be different, thereby causing local disturbance of the fluid. The helical distribution of multiple vanes causes vortex interaction and superposition, thereby forming turbulence and enhancing the turbulence effect.

[0056] The two curved flow guide vane groups 8 are respectively distributed on the sides away from each other of the two long strip-shaped flow guide vane groups 6, i.e. 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, for guiding 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 vane structure and preventing internal vane fracture. Further, the curved flow guide vane can change the direction of the fluid flowing along the wall, flowing to different positions in the cylinder, so that the fluid flowing along the cylinder wall is mixed with the fluid in the central area or other positions in the cylinder, promoting the mixing of the fluid in the entire space in the cylinder; at the curved part of the vane, due to the change in the curvature of the flow channel, the fluid will produce local speed change and pressure fluctuation, thereby causing disturbance of the fluid and enhancing the mixing between the fluid clusters; the curved flow guide vane group can guide the fluid to form a circular flow, which can drive the surrounding fluid to move together, so that the fluid at the cylinder wall is constantly exchanged and mixed with the fluid in other areas in the cylinder, improving the uniformity of the mixing; the curved vane can make the fluid change the flow direction in a relatively smooth manner, and when the fluid passes through the curved vane, it gradually adapts to the change in flow direction rather than suddenly turning, thereby reducing the impact load on the vane and preventing internal vane fracture.

[0057] To sum up, compared with the static water and fertilizer mixer with the traditional spiral blade structure, the static water and fertilizer mixer of the application enhances the shearing effect between fluid layers by adopting the expansion design of the flow channel of the cone 2 part, slows down the flow rate of the fluid, and creates more favorable conditions for the mixing process. Meanwhile, the first block-shaped flow guide vane group 5 inside provides blocking, segmentation and recombination for the fluid, enhances the turbulence effect and prolongs the flow path of the fluid. When the water and fertilizer mixture continues to flow, it will produce rotational motion and form a vortex, thereby improving the mixing efficiency and promoting the full intermingling of water and fertilizer. The cylindrical part 3 provides stable structural support, ensures the continuous formation of the vortex and the stable flow of the fluid, and through the three groups of flow guide vanes with different structures and functions inside, it realizes the uniform distribution of the fluid in the cylindrical part 3, effectively guides the fluid flow, makes it form a regular vortex structure inside the fertilizer mixer, and promotes the full mixing of water and fertilizer.

[0058] Embodiment two:

[0059] Referring to Figures 2 to 5 Based on embodiment one, optionally, the first block-shaped flow guide vane group 5 includes four first block-shaped flow guide vanes, one end of each of the first block-shaped flow guide vanes being fixed to the inner wall of the cone 2.

[0060] Specifically, the four first block-shaped flow guide vanes are distributed in a spiral shape and obliquely, and the four vanes can be reasonably arranged in a limited space, which can fully play the role of blocking, segmenting and recombining the fluid, and will not cause space congestion due to too many vanes, affecting the fluid flow or interfering with other components.

[0061] Optionally, each long strip-shaped flow guide vane group 6 includes two transverse long strip-shaped flow guide vanes and two longitudinal long strip-shaped flow guide vanes.

[0062] Among them, one side of the two transverse long strip-shaped flow guide vanes is fixed to the inner wall of the cylindrical part 3, and one side of the two longitudinal long strip-shaped flow guide vanes is fixed to the inner wall of the cylindrical part 3. The transversely arranged long strip-shaped flow guide vanes are staggered with the longitudinally arranged long strip-shaped flow guide vanes, and the axes of the two are perpendicular to each other.

[0063] Specifically, the original flow direction of the fluid will be forced to change after encountering the long strip-shaped flow guide vane group 6. The 90° transverse and longitudinal staggered layout makes these vortexes interfere and superimpose each other, further intensifying the turbulence degree of the fluid. The fluid energy dissipates quickly in the turbulent state, and the kinetic energy of the flow is consumed a lot, so it is difficult to maintain the original flow speed and direction, thereby achieving effective blocking of the fluid.

[0064] Optionally, the second block-shaped flow guide vane group 7 includes four second block-shaped flow guide vanes, one end of each of the second block-shaped flow guide vanes being fixed to the inner wall of the cylindrical part 3.

[0065] Specifically, the four second block-shaped flow guide vanes are spirally and obliquely arranged, and the four vanes can be reasonably arranged in limited space, can fully play a blocking role, and will not cause space congestion, affect fluid flow or interfere with other components.

[0066] Optionally, the four second block-shaped flow guide vanes are arranged at an axial inclination angle of 45°.

[0067] Specifically, the axial inclination angle of 45° can make the fluid flow more balanced between the axial and radial directions. When the fluid passes through the vane, it will not only obtain a certain axial propulsion, but also have appropriate diffusion or contraction in the radial direction, so that the fluid can better fill and utilize the space, avoid the occurrence of local high or low flow rate, and be beneficial to improve the uniformity and stability of the entire flow field; the vane arranged at an inclination angle of 45° can make different flow layers or fluids of different sources intersect and collide at a specific angle and path after passing through the vane, increase the interaction between the fluids, and thus enhance the mixing effect.

[0068] Optionally, each curved flow guide vane group 8 includes four curved flow guide vane pairs, each curved flow guide vane pair includes two curved flow guide vanes, and one end of each curved flow guide vane is fixed to the inner wall of the cylinder 3.

[0069] Specifically, the two curved flow guide vane groups 8 have a total of sixteen curved flow guide vanes, two curved flow guide vanes form a pair, four curved flow guide vane pairs are distributed at the top edge of the inner wall of the cylinder, and four curved flow guide vane pairs are distributed at the bottom edge of the inner wall of the cylinder.

[0070] Optionally, the curved angle of the curved flow guide vane is greater than 90° and less than 180°.

[0071] Specifically, the obtuse angle bending can make the turning process of the fluid passing through the flow guide vane more gentle. Compared with acute angle or right angle bending, the obtuse angle bending gives the fluid more buffer space and time, so that the fluid can gradually change direction, reduces the energy loss and pressure sudden change caused by sharp turning, helps to maintain stable flow of the fluid, and improves the overall efficiency of the system; when the fluid impacts the flow guide vane, the obtuse angle bending can disperse the force of the fluid to a larger vane area, compared with acute angle bending, the obtuse angle bending makes the force direction more dispersed, reduces the excessive pressure borne by the local area of the vane, reduces the risk of deformation and damage of the vane due to concentrated force, helps to improve the structural strength and stability of the vane, and prolongs the service life thereof; the obtuse angle bending can make the stress distribution more uniform, and improve the reliability of the vane structure. In the embodiment, the curved angle of the curved flow guide vane is 135°.

[0072] Optionally, the curved portion of the curved flow guide vane is smoothly transitioned.

[0073] Specifically, the smoothly transitioned curved portion enables the fluid to pass more smoothly, reduces energy loss and pressure drop during flow; when the fluid flows through the smoothly transitioned curved portion, it does not produce strong impact and vibration due to sudden change of direction, thereby reducing noise and vibration caused by unstable flow of the fluid and reducing fatigue damage to the vane structure; in addition, the smoothly transitioned curved portion is not prone to form fluid stagnation and local corrosion environment, which helps to maintain the integrity of the vane surface and enhance the corrosion resistance.

[0074] Embodiment Three:

[0075] Referring to Figures 6 to 13 , based on the above embodiments, the applicant uses Fluent software to perform performance simulation analysis on the designed vane flow guide type conical cylindrical static water and fertilizer mixer, and the performance evaluation index is the fertilizer liquid volume fraction inside the fertilizer mixer and the mixing uniformity at the outlet of the fertilizer mixer (mixing uniformity = {1-[(maximum volume fraction-minimum volume fraction) / maximum volume fraction]}×100%), and the specific analysis steps are as follows:

[0076] S1: Construct a simulation structure model of the vane flow guide type conical cylindrical static water and fertilizer mixer;

[0077] Add three mother liquor inlets at the front end of the vane flow guide type conical cylindrical static water and fertilizer mixer to complete the construction of the simulation structure model of the vane flow guide type conical cylindrical static water and fertilizer mixer Figure 6 ); it is known from Figure 6 that the model has 3 fertilizer mother liquor inlets (from left to right, they are nitrogen fertilizer mother liquor inlet, phosphorus fertilizer mother liquor inlet, and potassium fertilizer mother liquor inlet), 1 water inlet, and 1 water and fertilizer mixture outlet.

[0078] S2: Design a model simulation analysis strategy;

[0079] The simulation structure model of the vane-guided conical static water-fertilizer mixer has three fertilizer mother liquor inlets and one water inlet, so it has three groups of seven water-fertilizer mixing modes, i.e. water and single fertilizer mother liquor mixing (water + nitrogen, water + phosphorus, water + potassium), water and two fertilizer mother liquor mixing (water + nitrogen + phosphorus, water + nitrogen + potassium, water + phosphorus + potassium), and water and three fertilizer mother liquor mixing (water + nitrogen + phosphorus + potassium). In the simulation analysis of the vane-guided conical static water-fertilizer mixer, the inlets for conveying nitrogen, phosphorus and potassium fertilizer mother liquor are regarded as equivalent channels, so that the specific properties of each inlet do not need to be considered separately, which not only reduces the calculation burden of the model, but also enables the research to focus on evaluating the mixing performance of the vane-guided conical 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) are selected from the three groups of water-fertilizer mixing modes for subsequent simulation analysis.

[0080] S3: Analysis of simulation results of mixing effect of vane-guided conical static water-fertilizer mixer;

[0081] (1) Mixing of water and single fertilizer mother liquor;

[0082] Taking the mixing of water and nitrogen fertilizer mother liquor as a representative, Fluent simulation analysis software is used to simulate the conveying of water and nitrogen fertilizer mother liquor (phosphorus fertilizer and potassium fertilizer mother liquor channels are closed) into the vane-guided conical static water-fertilizer mixer for mixing from the water inlet and the nitrogen fertilizer mother liquor inlet, respectively. A plurality of radial sections are taken at appropriate positions of the simulation structure model of the vane-guided conical static water-fertilizer mixer to obtain the nitrogen fertilizer volume fraction cloud diagram inside the fertilizer mixer ( Figure 7 ) and the nitrogen fertilizer volume fraction cloud diagram at the outlet of the fertilizer mixer ( Figure 8 ). Figure 7 It can be seen that after water and nitrogen fertilizer mother liquor enter the vane-guided conical static water-fertilizer mixer, there is no obvious concentration gradient inside, which indicates that the conical structure of the vane-guided conical static water-fertilizer mixer and its internal different structures and function-guided vanes can make all inlet liquids rapidly and uniformly distributed inside the fertilizer mixer, thereby avoiding the formation of low and high concentration domains and achieving the goal of efficient dilution and uniform distribution. Figure 8 It can be obtained that the mixing uniformity of nitrogen fertilizer is 84.8%.

[0083] (2) Mixing of water and two fertilizer mother liquors;

[0084] With the mixture of water and nitrogen fertilizer mother liquor and phosphorus fertilizer mother liquor as the representative, Fluent simulation analysis software is used to simulate the transportation of water, nitrogen fertilizer mother liquor and phosphorus fertilizer mother liquor (potassium fertilizer mother liquor channel is in the closed state) into the vane-guided conical cylindrical static water-fertilizer mixer from the water inlet, nitrogen fertilizer mother liquor inlet and phosphorus fertilizer mother liquor inlet respectively for mixing; a plurality of radial sections are taken at appropriate positions of the simulation structure model of the vane-guided conical cylindrical static water-fertilizer mixer to obtain the volume fraction cloud diagram of nitrogen fertilizer and phosphorus fertilizer inside the fertilizer mixer ( Figure 9 ) and the volume fraction cloud diagram of nitrogen fertilizer and phosphorus fertilizer at the outlet of the fertilizer mixer ( Figure 10 ); it can be seen from Figure 9 that the nitrogen fertilizer mother liquor and the phosphorus fertilizer mother liquor can be rapidly and fully mixed and diluted with water 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 of the number of liquid phases; it can be obtained from Figure 10 that the mixing uniformity of nitrogen fertilizer and phosphorus fertilizer is 94.5% and 95.4% respectively.

[0085] (3) the mixture of water and three kinds of fertilizer mother liquor;

[0086] With the mixture of water and nitrogen fertilizer mother liquor, phosphorus fertilizer mother liquor and potassium fertilizer mother liquor as the representative, Fluent simulation analysis software is used to simulate the transportation of water, nitrogen fertilizer mother liquor, phosphorus fertilizer mother liquor and potassium fertilizer mother liquor into the vane-guided conical cylindrical static water-fertilizer mixer from the water inlet, nitrogen fertilizer mother liquor inlet, phosphorus fertilizer mother liquor inlet and potassium fertilizer mother liquor inlet respectively for mixing; a plurality of radial sections are taken at appropriate positions of the simulation structure model of the vane-guided conical cylindrical static water-fertilizer mixer to obtain the volume fraction cloud diagram of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer inside the fertilizer mixer ( Figure 11 ) and the volume fraction cloud diagram of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer at the outlet of the fertilizer mixer ( Figure 12 ); it can be seen from Figure 11 that the nitrogen fertilizer mother liquor, the phosphorus fertilizer mother liquor and the potassium fertilizer mother liquor can be rapidly and fully mixed and diluted with water 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 of the number of liquid phases; it can be obtained from Figure 12 that the mixing uniformity of nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer is 92.7%, 95.9% and 91.9% respectively.

[0087] In summary, the conical structure of the blade-guided conical static water-fertilizer mixer and the guide vanes with different structures and functions inside can achieve sufficient mixing of water and each fertilizer mother liquor. No obvious low and high concentration areas appear inside the mixer during the mixing process, and the mixing effect is not affected by the increase in the number of liquid phases, indicating that the structural design of the blade-guided conical static water-fertilizer mixer is reasonable. In addition, the mixing effect of the blade-guided conical static water-fertilizer mixer for each fertilizer in the above three typical combinations meets the requirements of the national industry standard (DG / T 274-2022) that the mixing uniformity is ≥80%, indicating that the blade-guided conical static water-fertilizer mixer can achieve uniform mixing of water and fertilizer in practical applications and has high promotion and application value.

[0088] S4: Flow resistance simulation analysis of the blade-guided conical static water-fertilizer mixer;

[0089] The resistance (i.e., flow resistance) experienced by the fluid when flowing in the blade-guided conical static water-fertilizer mixer is an important factor affecting the mixing efficiency and effect between fluids. Determining the inertial resistance coefficient C2 (resistance generated by fluid due to speed change) and the viscous resistance coefficient D (resistance generated by internal viscosity of fluid) can determine the total resistance experienced by the fluid when passing through the blade-guided conical static water-fertilizer mixer. Remove the three fertilizer mother liquor inlets in the simulation structure model of the blade-guided conical static water-fertilizer mixer constructed in step S1, and only keep the complete structure model of the blade-guided conical static water-fertilizer mixer. In the Fluent software, the flow rate of the fluid at the inlet is dynamically adjusted to obtain the corresponding outlet pressure drop (which directly reflects the resistance experienced by the fluid when passing through the blade-guided conical static water-fertilizer mixer) as shown in Table 1, and the fitting curve of the inlet flow rate and outlet pressure drop is drawn (Figure 1). Figure 13 ).

[0090] Table 1 Corresponding relationship table of inlet flow rate and outlet pressure drop

[0091]

[0092] From Figure 13 It can be seen that the relationship between the outlet pressure drop and the inlet flow rate satisfies a quadratic function (Formula 1), which is consistent with the theory of fluid flow properties (laminar flow 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. However, 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 exhibit a transition from laminar flow to turbulent flow when flowing in the blade-guided conical static water-fertilizer mixer, or there may be two flow states in different regions. Turbulent flow is more conducive to the sufficient mixing of fluids, which verifies the performance of the blade-guided conical static water-fertilizer mixer from another aspect.

[0093] Y = X (Formula 1)

[0094] In the formula: Y is the outlet pressure drop; X is the inlet flow rate.

[0095] In addition to the fluid flow properties, the outlet pressure drop and the inlet flow rate are also affected by the fluid density (p), the fluid viscosity (m) and the length of the blade-guided conical static water-fertilizer mixer (L). 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 indicates that the internal viscosity of the fluid is mainly relied on to promote the uniform mixing of the fluids, and the flow rate of the fluid has less effect on the uniformity of the mixing.

[0096] Y = X (Formula 2)

[0097] Y = X (Formula 3)

[0098] In the formula: p is the fluid density, which is 1x103 kg / m3; m is the fluid viscosity, which is 1.01x10-3 Pa·s; h is the height of the fertilizer mixer cone, which is 0.16 m.

[0099] In addition, the conical diameter of the present application is 95 mm, and the overall height is 280 mm, wherein the height of the conical part 2 is 60 mm, the height of the cylindrical part 3 is 100 mm, and the length of the fertilizer inlet pipe and the fertilizer outlet pipe is 60 mm; the inner diameter of the fertilizer inlet 1 and the fertilizer outlet 4 is 32 mm, which can be directly embedded into the pipe with DN25 aperture (outer diameter of 32 mm), and water and each mother liquor can flow into the blade-guided conical static water-fertilizer mixer by its own power to achieve sufficient mixing, higher fertilizer mixing efficiency and uniformity of the fertilizer solution, and there is no phenomenon of local over-fertilization or insufficient fertilization in the field fertilization process, which is beneficial to the normal growth of crops and reduces environmental pollution.

[0100] It should be noted that the structures and / or installation methods not described in detail in the present application can be known by those skilled in the art in combination with common knowledge and / or existing technology, and are not the focus of the disclosure in the present application, and will not be described further.

[0101] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present application and are not limiting, and 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 sizes of the drawings are not related to the specific objects, and the sizes of the objects can be arbitrarily changed.

Claims

1. A blade-guided conical static water and fertilizer mixer comprising a fertilizer inlet (1) and a fertilizer outlet (4), characterized in that, The blade-guiding conical cylinder static water and fertilizer mixing device further comprises: a cone (2); a cylinder (3) connected to a large-diameter end of the cone (2); a first block-shaped blade group (5) spirally and obliquely arranged in the cone (2); two long-strip-shaped blade groups (6) arranged in the cylinder (3), a second block-shaped blade group (7) spirally and obliquely arranged between the two long-strip-shaped blade groups (6), and a curved blade group (8) arranged on a side of each long-strip-shaped blade group (6) away from the other.

2. The vaned draft cone static water and fertilizer mixer of claim 1 wherein, The first block-shaped blade group (5) comprises four first block-shaped blades, and one end of each first block-shaped blade is fixed to an inner wall of the cone (2).

3. The vaned draft cone static water and fertilizer mixer of claim 1 wherein, Each long-strip-shaped blade group (6) comprises two transverse long-strip-shaped blades and two longitudinal long-strip-shaped blades. One side of each transverse long-strip-shaped blade is fixed to an inner wall of the cylinder (3), and one side of each longitudinal long-strip-shaped blade is fixed to the inner wall of the cylinder (3).

4. The vaned draft cone static water and fertilizer mixer of claim 3 wherein, The transverse long-strip-shaped blades are staggered with the longitudinal long-strip-shaped blades, and the axes of the transverse long-strip-shaped blades and the longitudinal long-strip-shaped blades are perpendicular to each other.

5. The vaned draft cone static water and fertilizer mixer of claim 1 wherein, The second block-shaped blade group (7) comprises four second block-shaped blades, and one end of each second block-shaped blade is fixed to an inner wall of the cylinder (3).

6. The vaned draft cone static water and fertilizer mixer of claim 1 wherein, The four second block-shaped blades are arranged at an axial inclination angle of 45°.

7. The vaned draft cone static water and fertilizer mixer of claim 1 wherein, Each curved blade group (8) comprises four pairs of curved blades, each pair of curved blades comprises two curved blades, and one end of each curved blade is fixed to an inner wall of the cylinder (3).

8. The vaned draft cone static water and fertilizer mixer of claim 7 wherein, The curved angle of each curved blade is greater than 90° and less than 180°.

9. The vaned draft cone static water and fertilizer mixer of claim 8 wherein, The curved blades are smoothly connected at the curved portions.

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